Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Lv Zheng | a8d4fc2 | 2015-02-05 16:27:35 +0800 | [diff] [blame] | 2 | * ec.c - ACPI Embedded Controller Driver (v3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Lv Zheng | a8d4fc2 | 2015-02-05 16:27:35 +0800 | [diff] [blame] | 4 | * Copyright (C) 2001-2015 Intel Corporation |
| 5 | * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> |
Lv Zheng | 4a3f6b5 | 2014-06-15 08:42:19 +0800 | [diff] [blame] | 6 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
| 7 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
| 8 | * 2004 Luming Yu <luming.yu@intel.com> |
| 9 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 10 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 11 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * |
| 13 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or (at |
| 18 | * your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, but |
| 21 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 23 | * General Public License for more details. |
| 24 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 26 | */ |
| 27 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 28 | /* Uncomment next line to get verbose printout */ |
Márton Németh | d772b3b | 2008-01-23 22:34:09 -0500 | [diff] [blame] | 29 | /* #define DEBUG */ |
Lan Tianyu | 16a26e8 | 2013-09-12 03:32:04 -0400 | [diff] [blame] | 30 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
Márton Németh | d772b3b | 2008-01-23 22:34:09 -0500 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/kernel.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/delay.h> |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 37 | #include <linux/interrupt.h> |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 38 | #include <linux/list.h> |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 39 | #include <linux/spinlock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 41 | #include <linux/acpi.h> |
Len Brown | eb27cae | 2009-07-06 23:40:19 -0400 | [diff] [blame] | 42 | #include <linux/dmi.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 43 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Thomas Renninger | 1195a09 | 2010-07-16 13:11:31 +0200 | [diff] [blame] | 45 | #include "internal.h" |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #define ACPI_EC_CLASS "embedded_controller" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
| 49 | #define ACPI_EC_FILE_INFO "info" |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 50 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 51 | /* EC status register */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
| 53 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ |
Lv Zheng | dd43de2 | 2014-06-15 08:42:42 +0800 | [diff] [blame] | 54 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
Alexey Starikovskiy | 4350933 | 2007-05-29 16:42:57 +0400 | [diff] [blame] | 57 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 58 | /* |
| 59 | * The SCI_EVT clearing timing is not defined by the ACPI specification. |
| 60 | * This leads to lots of practical timing issues for the host EC driver. |
| 61 | * The following variations are defined (from the target EC firmware's |
| 62 | * perspective): |
| 63 | * STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the |
| 64 | * target can clear SCI_EVT at any time so long as the host can see |
| 65 | * the indication by reading the status register (EC_SC). So the |
| 66 | * host should re-check SCI_EVT after the first time the SCI_EVT |
| 67 | * indication is seen, which is the same time the query request |
| 68 | * (QR_EC) is written to the command register (EC_CMD). SCI_EVT set |
| 69 | * at any later time could indicate another event. Normally such |
| 70 | * kind of EC firmware has implemented an event queue and will |
| 71 | * return 0x00 to indicate "no outstanding event". |
| 72 | * QUERY: After seeing the query request (QR_EC) written to the command |
| 73 | * register (EC_CMD) by the host and having prepared the responding |
| 74 | * event value in the data register (EC_DATA), the target can safely |
| 75 | * clear SCI_EVT because the target can confirm that the current |
| 76 | * event is being handled by the host. The host then should check |
| 77 | * SCI_EVT right after reading the event response from the data |
| 78 | * register (EC_DATA). |
| 79 | * EVENT: After seeing the event response read from the data register |
| 80 | * (EC_DATA) by the host, the target can clear SCI_EVT. As the |
| 81 | * target requires time to notice the change in the data register |
| 82 | * (EC_DATA), the host may be required to wait additional guarding |
| 83 | * time before checking the SCI_EVT again. Such guarding may not be |
| 84 | * necessary if the host is notified via another IRQ. |
| 85 | */ |
| 86 | #define ACPI_EC_EVT_TIMING_STATUS 0x00 |
| 87 | #define ACPI_EC_EVT_TIMING_QUERY 0x01 |
| 88 | #define ACPI_EC_EVT_TIMING_EVENT 0x02 |
| 89 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 90 | /* EC commands */ |
Alexey Starikovskiy | 3261ff4 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 91 | enum ec_command { |
Alexey Starikovskiy | 6ccedb1 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 92 | ACPI_EC_COMMAND_READ = 0x80, |
| 93 | ACPI_EC_COMMAND_WRITE = 0x81, |
| 94 | ACPI_EC_BURST_ENABLE = 0x82, |
| 95 | ACPI_EC_BURST_DISABLE = 0x83, |
| 96 | ACPI_EC_COMMAND_QUERY = 0x84, |
Alexey Starikovskiy | 3261ff4 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 97 | }; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 98 | |
Alexey Starikovskiy | 5c40641 | 2006-12-07 18:42:16 +0300 | [diff] [blame] | 99 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 100 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 101 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 102 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
| 103 | * when trying to clear the EC */ |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 104 | #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */ |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 105 | |
Alexey Starikovskiy | 080e412 | 2007-10-22 14:18:30 +0400 | [diff] [blame] | 106 | enum { |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 107 | EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 108 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 109 | EC_FLAGS_QUERY_GUARDING, /* Guard for SCI_EVT check */ |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 110 | EC_FLAGS_GPE_HANDLER_INSTALLED, /* GPE handler installed */ |
| 111 | EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 112 | EC_FLAGS_EVT_HANDLER_INSTALLED, /* _Qxx handlers installed */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 113 | EC_FLAGS_STARTED, /* Driver is started */ |
| 114 | EC_FLAGS_STOPPED, /* Driver is stopped */ |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 115 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
| 116 | * current command processing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | }; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 118 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 119 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
| 120 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ |
| 121 | |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 122 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
| 123 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; |
| 124 | module_param(ec_delay, uint, 0644); |
| 125 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); |
| 126 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 127 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
| 128 | module_param(ec_max_queries, uint, 0644); |
| 129 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); |
| 130 | |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 131 | static bool ec_busy_polling __read_mostly; |
| 132 | module_param(ec_busy_polling, bool, 0644); |
| 133 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); |
| 134 | |
| 135 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; |
| 136 | module_param(ec_polling_guard, uint, 0644); |
| 137 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); |
| 138 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 139 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 140 | |
Feng Tang | a520d52 | 2012-09-28 15:22:00 +0800 | [diff] [blame] | 141 | /* |
| 142 | * If the number of false interrupts per one transaction exceeds |
| 143 | * this threshold, will think there is a GPE storm happened and |
| 144 | * will disable the GPE for normal transaction. |
| 145 | */ |
| 146 | static unsigned int ec_storm_threshold __read_mostly = 8; |
| 147 | module_param(ec_storm_threshold, uint, 0644); |
| 148 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); |
| 149 | |
Lv Zheng | 456a997 | 2017-07-12 11:09:17 +0800 | [diff] [blame] | 150 | static bool ec_freeze_events __read_mostly = false; |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 151 | module_param(ec_freeze_events, bool, 0644); |
| 152 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); |
| 153 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 154 | struct acpi_ec_query_handler { |
| 155 | struct list_head node; |
| 156 | acpi_ec_query_func func; |
| 157 | acpi_handle handle; |
| 158 | void *data; |
| 159 | u8 query_bit; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 160 | struct kref kref; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 161 | }; |
| 162 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 163 | struct transaction { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 164 | const u8 *wdata; |
| 165 | u8 *rdata; |
| 166 | unsigned short irq_count; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 167 | u8 command; |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 168 | u8 wi; |
| 169 | u8 ri; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 170 | u8 wlen; |
| 171 | u8 rlen; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 172 | u8 flags; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 173 | }; |
| 174 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 175 | struct acpi_ec_query { |
| 176 | struct transaction transaction; |
| 177 | struct work_struct work; |
| 178 | struct acpi_ec_query_handler *handler; |
| 179 | }; |
| 180 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 181 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 182 | static void advance_transaction(struct acpi_ec *ec); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 183 | static void acpi_ec_event_handler(struct work_struct *work); |
| 184 | static void acpi_ec_event_processor(struct work_struct *work); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 185 | |
Thomas Renninger | 1195a09 | 2010-07-16 13:11:31 +0200 | [diff] [blame] | 186 | struct acpi_ec *boot_ec, *first_ec; |
| 187 | EXPORT_SYMBOL(first_ec); |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 188 | static bool boot_ec_is_ecdt = false; |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 189 | static struct workqueue_struct *ec_query_wq; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 190 | |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 191 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 192 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 193 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
Alexey Starikovskiy | 5423a0c | 2009-02-21 12:18:13 -0500 | [diff] [blame] | 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | /* -------------------------------------------------------------------------- |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 196 | * Logging/Debugging |
| 197 | * -------------------------------------------------------------------------- */ |
| 198 | |
| 199 | /* |
| 200 | * Splitters used by the developers to track the boundary of the EC |
| 201 | * handling processes. |
| 202 | */ |
| 203 | #ifdef DEBUG |
| 204 | #define EC_DBG_SEP " " |
| 205 | #define EC_DBG_DRV "+++++" |
| 206 | #define EC_DBG_STM "=====" |
| 207 | #define EC_DBG_REQ "*****" |
| 208 | #define EC_DBG_EVT "#####" |
| 209 | #else |
| 210 | #define EC_DBG_SEP "" |
| 211 | #define EC_DBG_DRV |
| 212 | #define EC_DBG_STM |
| 213 | #define EC_DBG_REQ |
| 214 | #define EC_DBG_EVT |
| 215 | #endif |
| 216 | |
| 217 | #define ec_log_raw(fmt, ...) \ |
| 218 | pr_info(fmt "\n", ##__VA_ARGS__) |
| 219 | #define ec_dbg_raw(fmt, ...) \ |
| 220 | pr_debug(fmt "\n", ##__VA_ARGS__) |
| 221 | #define ec_log(filter, fmt, ...) \ |
| 222 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 223 | #define ec_dbg(filter, fmt, ...) \ |
| 224 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 225 | |
| 226 | #define ec_log_drv(fmt, ...) \ |
| 227 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 228 | #define ec_dbg_drv(fmt, ...) \ |
| 229 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 230 | #define ec_dbg_stm(fmt, ...) \ |
| 231 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) |
| 232 | #define ec_dbg_req(fmt, ...) \ |
| 233 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) |
| 234 | #define ec_dbg_evt(fmt, ...) \ |
| 235 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 236 | #define ec_dbg_ref(ec, fmt, ...) \ |
| 237 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 238 | |
| 239 | /* -------------------------------------------------------------------------- |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 240 | * Device Flags |
| 241 | * -------------------------------------------------------------------------- */ |
| 242 | |
| 243 | static bool acpi_ec_started(struct acpi_ec *ec) |
| 244 | { |
| 245 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 246 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); |
| 247 | } |
| 248 | |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 249 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
| 250 | { |
| 251 | /* |
| 252 | * There is an OSPM early stage logic. During the early stages |
| 253 | * (boot/resume), OSPMs shouldn't enable the event handling, only |
| 254 | * the EC transactions are allowed to be performed. |
| 255 | */ |
| 256 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 257 | return false; |
| 258 | /* |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 259 | * However, disabling the event handling is experimental for late |
| 260 | * stage (suspend), and is controlled by the boot parameter of |
| 261 | * "ec_freeze_events": |
| 262 | * 1. true: The EC event handling is disabled before entering |
| 263 | * the noirq stage. |
| 264 | * 2. false: The EC event handling is automatically disabled as |
| 265 | * soon as the EC driver is stopped. |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 266 | */ |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 267 | if (ec_freeze_events) |
| 268 | return acpi_ec_started(ec); |
| 269 | else |
| 270 | return test_bit(EC_FLAGS_STARTED, &ec->flags); |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 271 | } |
| 272 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 273 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
| 274 | { |
| 275 | return ec->reference_count == 1; |
| 276 | } |
| 277 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 278 | /* -------------------------------------------------------------------------- |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 279 | * EC Registers |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 280 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 282 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 284 | u8 x = inb(ec->command_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 285 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 286 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
| 287 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", |
| 288 | x, |
| 289 | !!(x & ACPI_EC_FLAG_SCI), |
| 290 | !!(x & ACPI_EC_FLAG_BURST), |
| 291 | !!(x & ACPI_EC_FLAG_CMD), |
| 292 | !!(x & ACPI_EC_FLAG_IBF), |
| 293 | !!(x & ACPI_EC_FLAG_OBF)); |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 294 | return x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 297 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 298 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 299 | u8 x = inb(ec->data_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 300 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 301 | ec->timestamp = jiffies; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 302 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 303 | return x; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 304 | } |
| 305 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 306 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 307 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 308 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 309 | outb(command, ec->command_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 310 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 311 | } |
| 312 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 313 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 314 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 315 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 316 | outb(data, ec->data_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 317 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 318 | } |
| 319 | |
Lv Zheng | e34c0e2 | 2014-10-14 14:23:49 +0800 | [diff] [blame] | 320 | #ifdef DEBUG |
| 321 | static const char *acpi_ec_cmd_string(u8 cmd) |
| 322 | { |
| 323 | switch (cmd) { |
| 324 | case 0x80: |
| 325 | return "RD_EC"; |
| 326 | case 0x81: |
| 327 | return "WR_EC"; |
| 328 | case 0x82: |
| 329 | return "BE_EC"; |
| 330 | case 0x83: |
| 331 | return "BD_EC"; |
| 332 | case 0x84: |
| 333 | return "QR_EC"; |
| 334 | } |
| 335 | return "UNKNOWN"; |
| 336 | } |
| 337 | #else |
| 338 | #define acpi_ec_cmd_string(cmd) "UNDEF" |
| 339 | #endif |
| 340 | |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 341 | /* -------------------------------------------------------------------------- |
| 342 | * GPE Registers |
| 343 | * -------------------------------------------------------------------------- */ |
| 344 | |
| 345 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) |
| 346 | { |
| 347 | acpi_event_status gpe_status = 0; |
| 348 | |
| 349 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); |
Lv Zheng | 7c0b259 | 2015-05-15 14:16:17 +0800 | [diff] [blame] | 350 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) |
| 354 | { |
| 355 | if (open) |
| 356 | acpi_enable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 357 | else { |
| 358 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 359 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 360 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 361 | if (acpi_ec_is_gpe_raised(ec)) { |
| 362 | /* |
| 363 | * On some platforms, EN=1 writes cannot trigger GPE. So |
| 364 | * software need to manually trigger a pseudo GPE event on |
| 365 | * EN=1 writes. |
| 366 | */ |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 367 | ec_dbg_raw("Polling quirk"); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 368 | advance_transaction(ec); |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) |
| 373 | { |
| 374 | if (close) |
| 375 | acpi_disable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 376 | else { |
| 377 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 378 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 379 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) |
| 383 | { |
| 384 | /* |
| 385 | * GPE STS is a W1C register, which means: |
| 386 | * 1. Software can clear it without worrying about clearing other |
| 387 | * GPEs' STS bits when the hardware sets them in parallel. |
| 388 | * 2. As long as software can ensure only clearing it when it is |
| 389 | * set, hardware won't set it in parallel. |
| 390 | * So software can clear GPE in any contexts. |
| 391 | * Warning: do not move the check into advance_transaction() as the |
| 392 | * EC commands will be sent without GPE raised. |
| 393 | */ |
| 394 | if (!acpi_ec_is_gpe_raised(ec)) |
| 395 | return; |
| 396 | acpi_clear_gpe(NULL, ec->gpe); |
| 397 | } |
| 398 | |
| 399 | /* -------------------------------------------------------------------------- |
| 400 | * Transaction Management |
| 401 | * -------------------------------------------------------------------------- */ |
| 402 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 403 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
| 404 | { |
| 405 | ec->reference_count++; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 406 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 407 | ec->reference_count == 1) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 408 | acpi_ec_enable_gpe(ec, true); |
| 409 | } |
| 410 | |
| 411 | static void acpi_ec_complete_request(struct acpi_ec *ec) |
| 412 | { |
| 413 | bool flushed = false; |
| 414 | |
| 415 | ec->reference_count--; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 416 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 417 | ec->reference_count == 0) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 418 | acpi_ec_disable_gpe(ec, true); |
| 419 | flushed = acpi_ec_flushed(ec); |
| 420 | if (flushed) |
| 421 | wake_up(&ec->wait); |
| 422 | } |
| 423 | |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 424 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
| 425 | { |
| 426 | if (!test_bit(flag, &ec->flags)) { |
| 427 | acpi_ec_disable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 428 | ec_dbg_drv("Polling enabled"); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 429 | set_bit(flag, &ec->flags); |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) |
| 434 | { |
| 435 | if (test_bit(flag, &ec->flags)) { |
| 436 | clear_bit(flag, &ec->flags); |
| 437 | acpi_ec_enable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 438 | ec_dbg_drv("Polling disabled"); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 439 | } |
| 440 | } |
| 441 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 442 | /* |
| 443 | * acpi_ec_submit_flushable_request() - Increase the reference count unless |
| 444 | * the flush operation is not in |
| 445 | * progress |
| 446 | * @ec: the EC device |
| 447 | * |
| 448 | * This function must be used before taking a new action that should hold |
| 449 | * the reference count. If this function returns false, then the action |
| 450 | * must be discarded or it will prevent the flush operation from being |
| 451 | * completed. |
| 452 | */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 453 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 454 | { |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 455 | if (!acpi_ec_started(ec)) |
| 456 | return false; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 457 | acpi_ec_submit_request(ec); |
| 458 | return true; |
| 459 | } |
| 460 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 461 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 462 | { |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 463 | if (acpi_ec_event_enabled(ec) && |
| 464 | !test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 465 | ec_dbg_evt("Command(%s) submitted/blocked", |
| 466 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
| 467 | ec->nr_pending_queries++; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 468 | schedule_work(&ec->work); |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 469 | } |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 470 | } |
| 471 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 472 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 473 | { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 474 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 475 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 476 | ec_dbg_evt("Command(%s) unblocked", |
| 477 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 478 | } |
| 479 | } |
| 480 | |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 481 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
| 482 | { |
| 483 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 484 | ec_log_drv("event unblocked"); |
Lv Zheng | e923e8e | 2016-08-03 16:01:30 +0800 | [diff] [blame] | 485 | if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
| 486 | advance_transaction(ec); |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) |
| 490 | { |
| 491 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 492 | ec_log_drv("event blocked"); |
| 493 | } |
| 494 | |
| 495 | /* |
| 496 | * Process _Q events that might have accumulated in the EC. |
| 497 | * Run with locked ec mutex. |
| 498 | */ |
| 499 | static void acpi_ec_clear(struct acpi_ec *ec) |
| 500 | { |
| 501 | int i, status; |
| 502 | u8 value = 0; |
| 503 | |
| 504 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { |
| 505 | status = acpi_ec_query(ec, &value); |
| 506 | if (status || !value) |
| 507 | break; |
| 508 | } |
| 509 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) |
| 510 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); |
| 511 | else |
| 512 | pr_info("%d stale EC events cleared\n", i); |
| 513 | } |
| 514 | |
| 515 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
| 516 | { |
| 517 | unsigned long flags; |
| 518 | |
| 519 | spin_lock_irqsave(&ec->lock, flags); |
| 520 | if (acpi_ec_started(ec)) |
| 521 | __acpi_ec_enable_event(ec); |
| 522 | spin_unlock_irqrestore(&ec->lock, flags); |
| 523 | |
| 524 | /* Drain additional events if hardware requires that */ |
| 525 | if (EC_FLAGS_CLEAR_ON_RESUME) |
| 526 | acpi_ec_clear(ec); |
| 527 | } |
| 528 | |
Eric Biggers | eab05ec | 2016-10-05 10:33:16 -0700 | [diff] [blame] | 529 | #ifdef CONFIG_PM_SLEEP |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 530 | static bool acpi_ec_query_flushed(struct acpi_ec *ec) |
| 531 | { |
| 532 | bool flushed; |
| 533 | unsigned long flags; |
| 534 | |
| 535 | spin_lock_irqsave(&ec->lock, flags); |
| 536 | flushed = !ec->nr_pending_queries; |
| 537 | spin_unlock_irqrestore(&ec->lock, flags); |
| 538 | return flushed; |
| 539 | } |
| 540 | |
| 541 | static void __acpi_ec_flush_event(struct acpi_ec *ec) |
| 542 | { |
| 543 | /* |
| 544 | * When ec_freeze_events is true, we need to flush events in |
| 545 | * the proper position before entering the noirq stage. |
| 546 | */ |
| 547 | wait_event(ec->wait, acpi_ec_query_flushed(ec)); |
| 548 | if (ec_query_wq) |
| 549 | flush_workqueue(ec_query_wq); |
| 550 | } |
| 551 | |
| 552 | static void acpi_ec_disable_event(struct acpi_ec *ec) |
| 553 | { |
| 554 | unsigned long flags; |
| 555 | |
| 556 | spin_lock_irqsave(&ec->lock, flags); |
| 557 | __acpi_ec_disable_event(ec); |
| 558 | spin_unlock_irqrestore(&ec->lock, flags); |
| 559 | __acpi_ec_flush_event(ec); |
| 560 | } |
Eric Biggers | eab05ec | 2016-10-05 10:33:16 -0700 | [diff] [blame] | 561 | #endif /* CONFIG_PM_SLEEP */ |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 562 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 563 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
| 564 | { |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 565 | bool guarded = true; |
| 566 | unsigned long flags; |
| 567 | |
| 568 | spin_lock_irqsave(&ec->lock, flags); |
| 569 | /* |
| 570 | * If firmware SCI_EVT clearing timing is "event", we actually |
| 571 | * don't know when the SCI_EVT will be cleared by firmware after |
| 572 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an |
| 573 | * acceptable period. |
| 574 | * |
| 575 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is |
| 576 | * flagged, which means SCI_EVT check has just been performed. |
| 577 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the |
| 578 | * guarding should have already been performed (via |
| 579 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the |
| 580 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into |
| 581 | * ACPI_EC_COMMAND_POLL state immediately. |
| 582 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 583 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 584 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || |
| 585 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || |
| 586 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 587 | guarded = false; |
| 588 | spin_unlock_irqrestore(&ec->lock, flags); |
| 589 | return guarded; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 590 | } |
| 591 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 592 | static int ec_transaction_polled(struct acpi_ec *ec) |
| 593 | { |
| 594 | unsigned long flags; |
| 595 | int ret = 0; |
| 596 | |
| 597 | spin_lock_irqsave(&ec->lock, flags); |
| 598 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) |
| 599 | ret = 1; |
| 600 | spin_unlock_irqrestore(&ec->lock, flags); |
| 601 | return ret; |
| 602 | } |
| 603 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 604 | static int ec_transaction_completed(struct acpi_ec *ec) |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 605 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 606 | unsigned long flags; |
| 607 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 608 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 609 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 610 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 611 | ret = 1; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 612 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 613 | return ret; |
| 614 | } |
Denis M. Sadykov | 7c6db5e | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 615 | |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 616 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
| 617 | { |
| 618 | ec->curr->flags |= flag; |
| 619 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 620 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
| 621 | flag == ACPI_EC_COMMAND_POLL) |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 622 | acpi_ec_complete_query(ec); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 623 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && |
| 624 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 625 | acpi_ec_complete_query(ec); |
| 626 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
| 627 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 628 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 629 | } |
| 630 | } |
| 631 | |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 632 | static void advance_transaction(struct acpi_ec *ec) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 633 | { |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 634 | struct transaction *t; |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 635 | u8 status; |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 636 | bool wakeup = false; |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 637 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 638 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
| 639 | smp_processor_id()); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 640 | /* |
| 641 | * By always clearing STS before handling all indications, we can |
| 642 | * ensure a hardware STS 0->1 change after this clearing can always |
| 643 | * trigger a GPE interrupt. |
| 644 | */ |
| 645 | acpi_ec_clear_gpe(ec); |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 646 | status = acpi_ec_read_status(ec); |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 647 | t = ec->curr; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 648 | /* |
| 649 | * Another IRQ or a guarded polling mode advancement is detected, |
| 650 | * the next QR_EC submission is then allowed. |
| 651 | */ |
| 652 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { |
| 653 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 654 | (!ec->nr_pending_queries || |
| 655 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 656 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
| 657 | acpi_ec_complete_query(ec); |
| 658 | } |
| 659 | } |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 660 | if (!t) |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 661 | goto err; |
| 662 | if (t->flags & ACPI_EC_COMMAND_POLL) { |
| 663 | if (t->wlen > t->wi) { |
| 664 | if ((status & ACPI_EC_FLAG_IBF) == 0) |
| 665 | acpi_ec_write_data(ec, t->wdata[t->wi++]); |
| 666 | else |
| 667 | goto err; |
| 668 | } else if (t->rlen > t->ri) { |
| 669 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
| 670 | t->rdata[t->ri++] = acpi_ec_read_data(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 671 | if (t->rlen == t->ri) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 672 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 673 | if (t->command == ACPI_EC_COMMAND_QUERY) |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 674 | ec_dbg_evt("Command(%s) completed by hardware", |
| 675 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 676 | wakeup = true; |
| 677 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 678 | } else |
| 679 | goto err; |
| 680 | } else if (t->wlen == t->wi && |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 681 | (status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 682 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 683 | wakeup = true; |
| 684 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 685 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 686 | } else { |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 687 | if (EC_FLAGS_QUERY_HANDSHAKE && |
| 688 | !(status & ACPI_EC_FLAG_SCI) && |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 689 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 690 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 691 | t->rdata[t->ri++] = 0x00; |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 692 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 693 | ec_dbg_evt("Command(%s) completed by software", |
| 694 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 695 | wakeup = true; |
| 696 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 697 | acpi_ec_write_cmd(ec, t->command); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 698 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 699 | } else |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 700 | goto err; |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 701 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 702 | } |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 703 | err: |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 704 | /* |
| 705 | * If SCI bit is set, then don't think it's a false IRQ |
| 706 | * otherwise will take a not handled IRQ as a false one. |
| 707 | */ |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 708 | if (!(status & ACPI_EC_FLAG_SCI)) { |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 709 | if (in_interrupt() && t) { |
| 710 | if (t->irq_count < ec_storm_threshold) |
| 711 | ++t->irq_count; |
| 712 | /* Allow triggering on 0 threshold */ |
| 713 | if (t->irq_count == ec_storm_threshold) |
| 714 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); |
| 715 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 716 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 717 | out: |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 718 | if (status & ACPI_EC_FLAG_SCI) |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 719 | acpi_ec_submit_query(ec); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 720 | if (wakeup && in_interrupt()) |
| 721 | wake_up(&ec->wait); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 722 | } |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 723 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 724 | static void start_transaction(struct acpi_ec *ec) |
| 725 | { |
| 726 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; |
| 727 | ec->curr->flags = 0; |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | static int ec_guard(struct acpi_ec *ec) |
| 731 | { |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 732 | unsigned long guard = usecs_to_jiffies(ec->polling_guard); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 733 | unsigned long timeout = ec->timestamp + guard; |
| 734 | |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 735 | /* Ensure guarding period before polling EC status */ |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 736 | do { |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 737 | if (ec->busy_polling) { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 738 | /* Perform busy polling */ |
| 739 | if (ec_transaction_completed(ec)) |
| 740 | return 0; |
| 741 | udelay(jiffies_to_usecs(guard)); |
| 742 | } else { |
| 743 | /* |
| 744 | * Perform wait polling |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 745 | * 1. Wait the transaction to be completed by the |
| 746 | * GPE handler after the transaction enters |
| 747 | * ACPI_EC_COMMAND_POLL state. |
| 748 | * 2. A special guarding logic is also required |
| 749 | * for event clearing mode "event" before the |
| 750 | * transaction enters ACPI_EC_COMMAND_POLL |
| 751 | * state. |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 752 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 753 | if (!ec_transaction_polled(ec) && |
| 754 | !acpi_ec_guard_event(ec)) |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 755 | break; |
| 756 | if (wait_event_timeout(ec->wait, |
| 757 | ec_transaction_completed(ec), |
| 758 | guard)) |
| 759 | return 0; |
| 760 | } |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 761 | } while (time_before(jiffies, timeout)); |
| 762 | return -ETIME; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 763 | } |
| 764 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 765 | static int ec_poll(struct acpi_ec *ec) |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 766 | { |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 767 | unsigned long flags; |
Lan Tianyu | 28fe5c8 | 2013-05-06 03:23:40 +0000 | [diff] [blame] | 768 | int repeat = 5; /* number of command restarts */ |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 769 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 770 | while (repeat--) { |
| 771 | unsigned long delay = jiffies + |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 772 | msecs_to_jiffies(ec_delay); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 773 | do { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 774 | if (!ec_guard(ec)) |
| 775 | return 0; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 776 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 777 | advance_transaction(ec); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 778 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 779 | } while (time_before(jiffies, delay)); |
Lan Tianyu | 16a26e8 | 2013-09-12 03:32:04 -0400 | [diff] [blame] | 780 | pr_debug("controller reset, restart transaction\n"); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 781 | spin_lock_irqsave(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 782 | start_transaction(ec); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 783 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | af3fd14 | 2006-12-07 18:42:16 +0300 | [diff] [blame] | 784 | } |
Alexey Starikovskiy | b77d81b | 2008-03-21 17:07:15 +0300 | [diff] [blame] | 785 | return -ETIME; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 786 | } |
| 787 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 788 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 789 | struct transaction *t) |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 790 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 791 | unsigned long tmp; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 792 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 793 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 794 | /* start transaction */ |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 795 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 796 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 797 | if (!acpi_ec_submit_flushable_request(ec)) { |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 798 | ret = -EINVAL; |
| 799 | goto unlock; |
| 800 | } |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 801 | ec_dbg_ref(ec, "Increase command"); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 802 | /* following two actions should be kept atomic */ |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 803 | ec->curr = t; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 804 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 805 | start_transaction(ec); |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 806 | spin_unlock_irqrestore(&ec->lock, tmp); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 807 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 808 | ret = ec_poll(ec); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 809 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 810 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 811 | if (t->irq_count == ec_storm_threshold) |
| 812 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 813 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 814 | ec->curr = NULL; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 815 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
| 816 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 817 | ec_dbg_ref(ec, "Decrease command"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 818 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 819 | spin_unlock_irqrestore(&ec->lock, tmp); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 820 | return ret; |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 821 | } |
| 822 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 823 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 824 | { |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 825 | int status; |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 826 | u32 glk; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 827 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 828 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 829 | return -EINVAL; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 830 | if (t->rdata) |
| 831 | memset(t->rdata, 0, t->rlen); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 832 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 833 | mutex_lock(&ec->mutex); |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 834 | if (ec->global_lock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 836 | if (ACPI_FAILURE(status)) { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 837 | status = -ENODEV; |
| 838 | goto unlock; |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 839 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 841 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 842 | status = acpi_ec_transaction_unlocked(ec, t); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 843 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 844 | if (ec->global_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | acpi_release_global_lock(glk); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 846 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 847 | mutex_unlock(&ec->mutex); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 848 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 851 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 852 | { |
| 853 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 854 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
| 855 | .wdata = NULL, .rdata = &d, |
| 856 | .wlen = 0, .rlen = 1}; |
| 857 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 858 | return acpi_ec_transaction(ec, &t); |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 859 | } |
| 860 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 861 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 862 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 863 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
| 864 | .wdata = NULL, .rdata = NULL, |
| 865 | .wlen = 0, .rlen = 0}; |
| 866 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 867 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 868 | acpi_ec_transaction(ec, &t) : 0; |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 869 | } |
| 870 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 871 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 872 | { |
| 873 | int result; |
| 874 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 875 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
| 876 | .wdata = &address, .rdata = &d, |
| 877 | .wlen = 1, .rlen = 1}; |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 878 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 879 | result = acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 880 | *data = d; |
| 881 | return result; |
| 882 | } |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 883 | |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 884 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
| 885 | { |
Alexey Starikovskiy | 6ccedb1 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 886 | u8 wdata[2] = { address, data }; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 887 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
| 888 | .wdata = wdata, .rdata = NULL, |
| 889 | .wlen = 2, .rlen = 0}; |
| 890 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 891 | return acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 892 | } |
| 893 | |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 894 | int ec_read(u8 addr, u8 *val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | int err; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 897 | u8 temp_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
| 899 | if (!first_ec) |
| 900 | return -ENODEV; |
| 901 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 902 | err = acpi_ec_read(first_ec, addr, &temp_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | if (!err) { |
| 905 | *val = temp_data; |
| 906 | return 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 907 | } |
| 908 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
| 910 | EXPORT_SYMBOL(ec_read); |
| 911 | |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 912 | int ec_write(u8 addr, u8 val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | int err; |
| 915 | |
| 916 | if (!first_ec) |
| 917 | return -ENODEV; |
| 918 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 919 | err = acpi_ec_write(first_ec, addr, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | return err; |
| 922 | } |
| 923 | EXPORT_SYMBOL(ec_write); |
| 924 | |
Randy Dunlap | 616362d | 2006-10-27 01:47:34 -0400 | [diff] [blame] | 925 | int ec_transaction(u8 command, |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 926 | const u8 *wdata, unsigned wdata_len, |
| 927 | u8 *rdata, unsigned rdata_len) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 928 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 929 | struct transaction t = {.command = command, |
| 930 | .wdata = wdata, .rdata = rdata, |
| 931 | .wlen = wdata_len, .rlen = rdata_len}; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 932 | |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 933 | if (!first_ec) |
| 934 | return -ENODEV; |
| 935 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 936 | return acpi_ec_transaction(first_ec, &t); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 937 | } |
Lennart Poettering | ab9e43c | 2006-10-03 22:49:00 -0400 | [diff] [blame] | 938 | EXPORT_SYMBOL(ec_transaction); |
| 939 | |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 940 | /* Get the handle to the EC device */ |
| 941 | acpi_handle ec_get_handle(void) |
| 942 | { |
| 943 | if (!first_ec) |
| 944 | return NULL; |
| 945 | return first_ec->handle; |
| 946 | } |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 947 | EXPORT_SYMBOL(ec_get_handle); |
| 948 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 949 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
| 950 | { |
| 951 | unsigned long flags; |
| 952 | |
| 953 | spin_lock_irqsave(&ec->lock, flags); |
| 954 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 955 | ec_dbg_drv("Starting EC"); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 956 | /* Enable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 957 | if (!resuming) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 958 | acpi_ec_submit_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 959 | ec_dbg_ref(ec, "Increase driver"); |
Lv Zheng | c2b46d6 | 2016-08-03 16:01:36 +0800 | [diff] [blame] | 960 | } |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 961 | ec_log_drv("EC started"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 962 | } |
| 963 | spin_unlock_irqrestore(&ec->lock, flags); |
| 964 | } |
| 965 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 966 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
| 967 | { |
| 968 | unsigned long flags; |
| 969 | bool flushed; |
| 970 | |
| 971 | spin_lock_irqsave(&ec->lock, flags); |
| 972 | flushed = acpi_ec_flushed(ec); |
| 973 | spin_unlock_irqrestore(&ec->lock, flags); |
| 974 | return flushed; |
| 975 | } |
| 976 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 977 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
| 978 | { |
| 979 | unsigned long flags; |
| 980 | |
| 981 | spin_lock_irqsave(&ec->lock, flags); |
| 982 | if (acpi_ec_started(ec)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 983 | ec_dbg_drv("Stopping EC"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 984 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 985 | spin_unlock_irqrestore(&ec->lock, flags); |
| 986 | wait_event(ec->wait, acpi_ec_stopped(ec)); |
| 987 | spin_lock_irqsave(&ec->lock, flags); |
| 988 | /* Disable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 989 | if (!suspending) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 990 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 991 | ec_dbg_ref(ec, "Decrease driver"); |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 992 | } else if (!ec_freeze_events) |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 993 | __acpi_ec_disable_event(ec); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 994 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
| 995 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 996 | ec_log_drv("EC stopped"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 997 | } |
| 998 | spin_unlock_irqrestore(&ec->lock, flags); |
| 999 | } |
| 1000 | |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1001 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) |
| 1002 | { |
| 1003 | unsigned long flags; |
| 1004 | |
| 1005 | spin_lock_irqsave(&ec->lock, flags); |
| 1006 | ec->busy_polling = true; |
| 1007 | ec->polling_guard = 0; |
| 1008 | ec_log_drv("interrupt blocked"); |
| 1009 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1010 | } |
| 1011 | |
| 1012 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) |
| 1013 | { |
| 1014 | unsigned long flags; |
| 1015 | |
| 1016 | spin_lock_irqsave(&ec->lock, flags); |
| 1017 | ec->busy_polling = ec_busy_polling; |
| 1018 | ec->polling_guard = ec_polling_guard; |
| 1019 | ec_log_drv("interrupt unblocked"); |
| 1020 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1021 | } |
| 1022 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 1023 | void acpi_ec_block_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1024 | { |
| 1025 | struct acpi_ec *ec = first_ec; |
| 1026 | |
| 1027 | if (!ec) |
| 1028 | return; |
| 1029 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1030 | mutex_lock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1031 | /* Prevent transactions from being carried out */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1032 | acpi_ec_stop(ec, true); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1033 | mutex_unlock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1034 | } |
| 1035 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 1036 | void acpi_ec_unblock_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1037 | { |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 1038 | /* |
| 1039 | * Allow transactions to happen again (this function is called from |
| 1040 | * atomic context during wakeup, so we don't need to acquire the mutex). |
| 1041 | */ |
| 1042 | if (first_ec) |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1043 | acpi_ec_start(first_ec, true); |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 1044 | } |
| 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | /* -------------------------------------------------------------------------- |
| 1047 | Event Management |
| 1048 | -------------------------------------------------------------------------- */ |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1049 | static struct acpi_ec_query_handler * |
| 1050 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) |
| 1051 | { |
| 1052 | if (handler) |
| 1053 | kref_get(&handler->kref); |
| 1054 | return handler; |
| 1055 | } |
| 1056 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1057 | static struct acpi_ec_query_handler * |
| 1058 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) |
| 1059 | { |
| 1060 | struct acpi_ec_query_handler *handler; |
| 1061 | bool found = false; |
| 1062 | |
| 1063 | mutex_lock(&ec->mutex); |
| 1064 | list_for_each_entry(handler, &ec->list, node) { |
| 1065 | if (value == handler->query_bit) { |
| 1066 | found = true; |
| 1067 | break; |
| 1068 | } |
| 1069 | } |
| 1070 | mutex_unlock(&ec->mutex); |
| 1071 | return found ? acpi_ec_get_query_handler(handler) : NULL; |
| 1072 | } |
| 1073 | |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1074 | static void acpi_ec_query_handler_release(struct kref *kref) |
| 1075 | { |
| 1076 | struct acpi_ec_query_handler *handler = |
| 1077 | container_of(kref, struct acpi_ec_query_handler, kref); |
| 1078 | |
| 1079 | kfree(handler); |
| 1080 | } |
| 1081 | |
| 1082 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) |
| 1083 | { |
| 1084 | kref_put(&handler->kref, acpi_ec_query_handler_release); |
| 1085 | } |
| 1086 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1087 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
| 1088 | acpi_handle handle, acpi_ec_query_func func, |
| 1089 | void *data) |
| 1090 | { |
| 1091 | struct acpi_ec_query_handler *handler = |
| 1092 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1093 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1094 | if (!handler) |
| 1095 | return -ENOMEM; |
| 1096 | |
| 1097 | handler->query_bit = query_bit; |
| 1098 | handler->handle = handle; |
| 1099 | handler->func = func; |
| 1100 | handler->data = data; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1101 | mutex_lock(&ec->mutex); |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1102 | kref_init(&handler->kref); |
Alexey Starikovskiy | 30c0857 | 2007-09-26 19:43:22 +0400 | [diff] [blame] | 1103 | list_add(&handler->node, &ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1104 | mutex_unlock(&ec->mutex); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1105 | return 0; |
| 1106 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1107 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
| 1108 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1109 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
| 1110 | bool remove_all, u8 query_bit) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1111 | { |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1112 | struct acpi_ec_query_handler *handler, *tmp; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1113 | LIST_HEAD(free_list); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1114 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1115 | mutex_lock(&ec->mutex); |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1116 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1117 | if (remove_all || query_bit == handler->query_bit) { |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1118 | list_del_init(&handler->node); |
| 1119 | list_add(&handler->node, &free_list); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1120 | } |
| 1121 | } |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1122 | mutex_unlock(&ec->mutex); |
Chris Bainbridge | 6b5eab5 | 2015-04-22 00:25:36 +0100 | [diff] [blame] | 1123 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1124 | acpi_ec_put_query_handler(handler); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1125 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1126 | |
| 1127 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) |
| 1128 | { |
| 1129 | acpi_ec_remove_query_handlers(ec, false, query_bit); |
| 1130 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1131 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1133 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | { |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1135 | struct acpi_ec_query *q; |
| 1136 | struct transaction *t; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1137 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1138 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); |
| 1139 | if (!q) |
| 1140 | return NULL; |
| 1141 | INIT_WORK(&q->work, acpi_ec_event_processor); |
| 1142 | t = &q->transaction; |
| 1143 | t->command = ACPI_EC_COMMAND_QUERY; |
| 1144 | t->rdata = pval; |
| 1145 | t->rlen = 1; |
| 1146 | return q; |
| 1147 | } |
| 1148 | |
| 1149 | static void acpi_ec_delete_query(struct acpi_ec_query *q) |
| 1150 | { |
| 1151 | if (q) { |
| 1152 | if (q->handler) |
| 1153 | acpi_ec_put_query_handler(q->handler); |
| 1154 | kfree(q); |
| 1155 | } |
| 1156 | } |
| 1157 | |
| 1158 | static void acpi_ec_event_processor(struct work_struct *work) |
| 1159 | { |
| 1160 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); |
| 1161 | struct acpi_ec_query_handler *handler = q->handler; |
| 1162 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1163 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1164 | if (handler->func) |
| 1165 | handler->func(handler->data); |
| 1166 | else if (handler->handle) |
| 1167 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1168 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1169 | acpi_ec_delete_query(q); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1170 | } |
| 1171 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1172 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1173 | { |
| 1174 | u8 value = 0; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1175 | int result; |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1176 | struct acpi_ec_query *q; |
| 1177 | |
| 1178 | q = acpi_ec_create_query(&value); |
| 1179 | if (!q) |
| 1180 | return -ENOMEM; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1181 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1182 | /* |
| 1183 | * Query the EC to find out which _Qxx method we need to evaluate. |
| 1184 | * Note that successful completion of the query causes the ACPI_EC_SCI |
| 1185 | * bit to be cleared (and thus clearing the interrupt source). |
| 1186 | */ |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1187 | result = acpi_ec_transaction(ec, &q->transaction); |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1188 | if (!value) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1189 | result = -ENODATA; |
| 1190 | if (result) |
| 1191 | goto err_exit; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1192 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1193 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
| 1194 | if (!q->handler) { |
| 1195 | result = -ENODATA; |
| 1196 | goto err_exit; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1197 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1198 | |
| 1199 | /* |
| 1200 | * It is reported that _Qxx are evaluated in a parallel way on |
| 1201 | * Windows: |
| 1202 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 |
| 1203 | * |
| 1204 | * Put this log entry before schedule_work() in order to make |
| 1205 | * it appearing before any other log entries occurred during the |
| 1206 | * work queue execution. |
| 1207 | */ |
| 1208 | ec_dbg_evt("Query(0x%02x) scheduled", value); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1209 | if (!queue_work(ec_query_wq, &q->work)) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1210 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
| 1211 | result = -EBUSY; |
| 1212 | } |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1213 | |
| 1214 | err_exit: |
Markus Elfring | 4981c2b | 2015-11-15 22:42:27 +0100 | [diff] [blame] | 1215 | if (result) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1216 | acpi_ec_delete_query(q); |
| 1217 | if (data) |
| 1218 | *data = value; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1219 | return result; |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1220 | } |
| 1221 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1222 | static void acpi_ec_check_event(struct acpi_ec *ec) |
| 1223 | { |
| 1224 | unsigned long flags; |
| 1225 | |
| 1226 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { |
| 1227 | if (ec_guard(ec)) { |
| 1228 | spin_lock_irqsave(&ec->lock, flags); |
| 1229 | /* |
| 1230 | * Take care of the SCI_EVT unless no one else is |
| 1231 | * taking care of it. |
| 1232 | */ |
| 1233 | if (!ec->curr) |
| 1234 | advance_transaction(ec); |
| 1235 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1236 | } |
| 1237 | } |
| 1238 | } |
| 1239 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1240 | static void acpi_ec_event_handler(struct work_struct *work) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1241 | { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1242 | unsigned long flags; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 1243 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1244 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1245 | ec_dbg_evt("Event started"); |
| 1246 | |
| 1247 | spin_lock_irqsave(&ec->lock, flags); |
| 1248 | while (ec->nr_pending_queries) { |
| 1249 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1250 | (void)acpi_ec_query(ec, NULL); |
| 1251 | spin_lock_irqsave(&ec->lock, flags); |
| 1252 | ec->nr_pending_queries--; |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 1253 | /* |
| 1254 | * Before exit, make sure that this work item can be |
| 1255 | * scheduled again. There might be QR_EC failures, leaving |
| 1256 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work |
| 1257 | * item from being scheduled again. |
| 1258 | */ |
| 1259 | if (!ec->nr_pending_queries) { |
| 1260 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 1261 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) |
| 1262 | acpi_ec_complete_query(ec); |
| 1263 | } |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1264 | } |
| 1265 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1266 | |
| 1267 | ec_dbg_evt("Event stopped"); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1268 | |
| 1269 | acpi_ec_check_event(ec); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 1270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | |
Lin Ming | 8b6cd8a | 2010-12-13 13:38:46 +0800 | [diff] [blame] | 1272 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
| 1273 | u32 gpe_number, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1275 | unsigned long flags; |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1276 | struct acpi_ec *ec = data; |
Lennart Poettering | 00eb43a | 2007-05-04 14:16:19 +0200 | [diff] [blame] | 1277 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1278 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 1279 | advance_transaction(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 1280 | spin_unlock_irqrestore(&ec->lock, flags); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 1281 | return ACPI_INTERRUPT_HANDLED; |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 1282 | } |
| 1283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1285 | * Address Space Management |
| 1286 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
| 1288 | static acpi_status |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1289 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1290 | u32 bits, u64 *value64, |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1291 | void *handler_context, void *region_context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | { |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1293 | struct acpi_ec *ec = handler_context; |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1294 | int result = 0, i, bytes = bits / 8; |
| 1295 | u8 *value = (u8 *)value64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | if ((address > 0xFF) || !value || !handler_context) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1298 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1300 | if (function != ACPI_READ && function != ACPI_WRITE) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1301 | return AE_BAD_PARAMETER; |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1302 | |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1303 | if (ec->busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1304 | acpi_ec_burst_enable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1305 | |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1306 | for (i = 0; i < bytes; ++i, ++address, ++value) |
| 1307 | result = (function == ACPI_READ) ? |
| 1308 | acpi_ec_read(ec, address, value) : |
| 1309 | acpi_ec_write(ec, address, *value); |
Alexey Starikovskiy | 3e71a87 | 2008-01-11 02:42:51 +0300 | [diff] [blame] | 1310 | |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1311 | if (ec->busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1312 | acpi_ec_burst_disable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | switch (result) { |
| 1315 | case -EINVAL: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1316 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | case -ENODEV: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1318 | return AE_NOT_FOUND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | case -ETIME: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1320 | return AE_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | default: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1322 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | } |
| 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1327 | * Driver Interface |
| 1328 | * -------------------------------------------------------------------------- */ |
| 1329 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1330 | static acpi_status |
| 1331 | ec_parse_io_ports(struct acpi_resource *resource, void *context); |
| 1332 | |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1333 | static void acpi_ec_free(struct acpi_ec *ec) |
| 1334 | { |
| 1335 | if (first_ec == ec) |
| 1336 | first_ec = NULL; |
| 1337 | if (boot_ec == ec) |
| 1338 | boot_ec = NULL; |
| 1339 | kfree(ec); |
| 1340 | } |
| 1341 | |
| 1342 | static struct acpi_ec *acpi_ec_alloc(void) |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1343 | { |
| 1344 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1345 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1346 | if (!ec) |
| 1347 | return NULL; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1348 | mutex_init(&ec->mutex); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1349 | init_waitqueue_head(&ec->wait); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1350 | INIT_LIST_HEAD(&ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1351 | spin_lock_init(&ec->lock); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1352 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 1353 | ec->timestamp = jiffies; |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1354 | ec->busy_polling = true; |
| 1355 | ec->polling_guard = 0; |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1356 | return ec; |
| 1357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1359 | static acpi_status |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1360 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, |
| 1361 | void *context, void **return_value) |
| 1362 | { |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1363 | char node_name[5]; |
| 1364 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1365 | struct acpi_ec *ec = context; |
| 1366 | int value = 0; |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1367 | acpi_status status; |
| 1368 | |
| 1369 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
| 1370 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1371 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1372 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1373 | return AE_OK; |
| 1374 | } |
| 1375 | |
| 1376 | static acpi_status |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1377 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1378 | { |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1379 | acpi_status status; |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1380 | unsigned long long tmp = 0; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1381 | struct acpi_ec *ec = context; |
Alexey Starikovskiy | a5032bf | 2009-04-01 01:33:15 -0400 | [diff] [blame] | 1382 | |
| 1383 | /* clear addr values, ec_parse_io_ports depend on it */ |
| 1384 | ec->command_addr = ec->data_addr = 0; |
| 1385 | |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1386 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 1387 | ec_parse_io_ports, ec); |
| 1388 | if (ACPI_FAILURE(status)) |
| 1389 | return status; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1390 | |
| 1391 | /* Get GPE bit assignment (EC events). */ |
| 1392 | /* TODO: Add support for _GPE returning a package */ |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1393 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1394 | if (ACPI_FAILURE(status)) |
| 1395 | return status; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1396 | ec->gpe = tmp; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1397 | /* Use the global lock for all EC transactions? */ |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1398 | tmp = 0; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1399 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
| 1400 | ec->global_lock = tmp; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1401 | ec->handle = handle; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1402 | return AE_CTRL_TERMINATE; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1403 | } |
| 1404 | |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1405 | /* |
| 1406 | * Note: This function returns an error code only when the address space |
| 1407 | * handler is not installed, which means "not able to handle |
| 1408 | * transactions". |
| 1409 | */ |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1410 | static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1411 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1412 | acpi_status status; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1413 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1414 | acpi_ec_start(ec, false); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1415 | |
| 1416 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1417 | acpi_ec_enter_noirq(ec); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1418 | status = acpi_install_address_space_handler(ec->handle, |
| 1419 | ACPI_ADR_SPACE_EC, |
| 1420 | &acpi_ec_space_handler, |
| 1421 | NULL, ec); |
| 1422 | if (ACPI_FAILURE(status)) { |
| 1423 | if (status == AE_NOT_FOUND) { |
| 1424 | /* |
| 1425 | * Maybe OS fails in evaluating the _REG |
| 1426 | * object. The AE_NOT_FOUND error will be |
| 1427 | * ignored and OS * continue to initialize |
| 1428 | * EC. |
| 1429 | */ |
| 1430 | pr_err("Fail in evaluating the _REG object" |
| 1431 | " of EC device. Broken bios is suspected.\n"); |
| 1432 | } else { |
| 1433 | acpi_ec_stop(ec, false); |
| 1434 | return -ENODEV; |
| 1435 | } |
| 1436 | } |
| 1437 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1438 | } |
| 1439 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1440 | if (!handle_events) |
| 1441 | return 0; |
| 1442 | |
| 1443 | if (!test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
| 1444 | /* Find and register all query methods */ |
| 1445 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, |
| 1446 | acpi_ec_register_query_methods, |
| 1447 | NULL, ec, NULL); |
| 1448 | set_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); |
| 1449 | } |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1450 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1451 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
| 1452 | ACPI_GPE_EDGE_TRIGGERED, |
| 1453 | &acpi_ec_gpe_handler, ec); |
| 1454 | /* This is not fatal as we can poll EC events */ |
| 1455 | if (ACPI_SUCCESS(status)) { |
| 1456 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
Lv Zheng | 0dd9621 | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1457 | acpi_ec_leave_noirq(ec); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1458 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 1459 | ec->reference_count >= 1) |
| 1460 | acpi_ec_enable_gpe(ec, true); |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1461 | |
| 1462 | /* EC is fully operational, allow queries */ |
| 1463 | acpi_ec_enable_event(ec); |
Zhao Yakui | 20edd74 | 2008-10-17 02:02:44 -0400 | [diff] [blame] | 1464 | } |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1465 | } |
| 1466 | |
| 1467 | return 0; |
| 1468 | } |
| 1469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | static void ec_remove_handlers(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | { |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1472 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
| 1473 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
| 1474 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
| 1475 | pr_err("failed to remove space handler\n"); |
| 1476 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1477 | } |
| 1478 | |
Lv Zheng | fa5b4a5 | 2016-07-08 09:25:05 +0800 | [diff] [blame] | 1479 | /* |
| 1480 | * Stops handling the EC transactions after removing the operation |
| 1481 | * region handler. This is required because _REG(DISCONNECT) |
| 1482 | * invoked during the removal can result in new EC transactions. |
| 1483 | * |
| 1484 | * Flushes the EC requests and thus disables the GPE before |
| 1485 | * removing the GPE handler. This is required by the current ACPICA |
| 1486 | * GPE core. ACPICA GPE core will automatically disable a GPE when |
| 1487 | * it is indicated but there is no way to handle it. So the drivers |
| 1488 | * must disable the GPEs prior to removing the GPE handlers. |
| 1489 | */ |
| 1490 | acpi_ec_stop(ec, false); |
| 1491 | |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1492 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1493 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
| 1494 | &acpi_ec_gpe_handler))) |
| 1495 | pr_err("failed to remove gpe handler\n"); |
| 1496 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
| 1497 | } |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1498 | if (test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
| 1499 | acpi_ec_remove_query_handlers(ec, true, 0); |
| 1500 | clear_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); |
| 1501 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1504 | static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | { |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1506 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1508 | ret = ec_install_handlers(ec, handle_events); |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1509 | if (ret) |
| 1510 | return ret; |
| 1511 | |
| 1512 | /* First EC capable of handling transactions */ |
| 1513 | if (!first_ec) { |
| 1514 | first_ec = ec; |
| 1515 | acpi_handle_info(first_ec->handle, "Used as first EC\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | } |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1517 | |
| 1518 | acpi_handle_info(ec->handle, |
| 1519 | "GPE=0x%lx, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", |
| 1520 | ec->gpe, ec->command_addr, ec->data_addr); |
| 1521 | return ret; |
| 1522 | } |
| 1523 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1524 | static int acpi_config_boot_ec(struct acpi_ec *ec, acpi_handle handle, |
| 1525 | bool handle_events, bool is_ecdt) |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1526 | { |
| 1527 | int ret; |
| 1528 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1529 | /* |
| 1530 | * Changing the ACPI handle results in a re-configuration of the |
| 1531 | * boot EC. And if it happens after the namespace initialization, |
| 1532 | * it causes _REG evaluations. |
| 1533 | */ |
| 1534 | if (boot_ec && boot_ec->handle != handle) |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1535 | ec_remove_handlers(boot_ec); |
| 1536 | |
| 1537 | /* Unset old boot EC */ |
| 1538 | if (boot_ec != ec) |
| 1539 | acpi_ec_free(boot_ec); |
| 1540 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1541 | /* |
| 1542 | * ECDT device creation is split into acpi_ec_ecdt_probe() and |
| 1543 | * acpi_ec_ecdt_start(). This function takes care of completing the |
| 1544 | * ECDT parsing logic as the handle update should be performed |
| 1545 | * between the installation/uninstallation of the handlers. |
| 1546 | */ |
| 1547 | if (ec->handle != handle) |
| 1548 | ec->handle = handle; |
| 1549 | |
| 1550 | ret = acpi_ec_setup(ec, handle_events); |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1551 | if (ret) |
| 1552 | return ret; |
| 1553 | |
| 1554 | /* Set new boot EC */ |
| 1555 | if (!boot_ec) { |
| 1556 | boot_ec = ec; |
| 1557 | boot_ec_is_ecdt = is_ecdt; |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1558 | } |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1559 | |
| 1560 | acpi_handle_info(boot_ec->handle, |
| 1561 | "Used as boot %s EC to handle transactions%s\n", |
| 1562 | is_ecdt ? "ECDT" : "DSDT", |
| 1563 | handle_events ? " and events" : ""); |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1564 | return ret; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1565 | } |
| 1566 | |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1567 | static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle) |
| 1568 | { |
| 1569 | struct acpi_table_ecdt *ecdt_ptr; |
| 1570 | acpi_status status; |
| 1571 | acpi_handle handle; |
| 1572 | |
| 1573 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 1574 | (struct acpi_table_header **)&ecdt_ptr); |
| 1575 | if (ACPI_FAILURE(status)) |
| 1576 | return false; |
| 1577 | |
| 1578 | status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); |
| 1579 | if (ACPI_FAILURE(status)) |
| 1580 | return false; |
| 1581 | |
| 1582 | *phandle = handle; |
| 1583 | return true; |
| 1584 | } |
| 1585 | |
| 1586 | static bool acpi_is_boot_ec(struct acpi_ec *ec) |
| 1587 | { |
| 1588 | if (!boot_ec) |
| 1589 | return false; |
| 1590 | if (ec->handle == boot_ec->handle && |
| 1591 | ec->gpe == boot_ec->gpe && |
| 1592 | ec->command_addr == boot_ec->command_addr && |
| 1593 | ec->data_addr == boot_ec->data_addr) |
| 1594 | return true; |
| 1595 | return false; |
| 1596 | } |
| 1597 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1598 | static int acpi_ec_add(struct acpi_device *device) |
| 1599 | { |
| 1600 | struct acpi_ec *ec = NULL; |
| 1601 | int ret; |
| 1602 | |
| 1603 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| 1604 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| 1605 | |
| 1606 | ec = acpi_ec_alloc(); |
| 1607 | if (!ec) |
| 1608 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
| 1610 | AE_CTRL_TERMINATE) { |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1611 | ret = -EINVAL; |
| 1612 | goto err_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | } |
| 1614 | |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1615 | if (acpi_is_boot_ec(ec)) { |
| 1616 | boot_ec_is_ecdt = false; |
| 1617 | acpi_handle_debug(ec->handle, "duplicated.\n"); |
| 1618 | acpi_ec_free(ec); |
| 1619 | ec = boot_ec; |
| 1620 | ret = acpi_config_boot_ec(ec, ec->handle, true, false); |
| 1621 | } else |
| 1622 | ret = acpi_ec_setup(ec, true); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1623 | if (ret) |
| 1624 | goto err_query; |
| 1625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | device->driver_data = ec; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1627 | |
Andi Kleen | d6795fe3 | 2012-02-06 08:17:08 -0800 | [diff] [blame] | 1628 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
| 1629 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); |
| 1630 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); |
| 1631 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1632 | |
Lan Tianyu | 1c832b3 | 2015-04-01 09:47:18 +0800 | [diff] [blame] | 1633 | /* Reprobe devices depending on the EC */ |
| 1634 | acpi_walk_dep_device_list(ec->handle); |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1635 | acpi_handle_debug(ec->handle, "enumerated.\n"); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1636 | return 0; |
| 1637 | |
| 1638 | err_query: |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1639 | if (ec != boot_ec) |
| 1640 | acpi_ec_remove_query_handlers(ec, true, 0); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1641 | err_alloc: |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1642 | if (ec != boot_ec) |
| 1643 | acpi_ec_free(ec); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1644 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | } |
| 1646 | |
Rafael J. Wysocki | 51fac83 | 2013-01-24 00:24:48 +0100 | [diff] [blame] | 1647 | static int acpi_ec_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1649 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1652 | return -EINVAL; |
Alexey Starikovskiy | f9319f9 | 2007-08-24 08:10:11 +0400 | [diff] [blame] | 1653 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | ec = acpi_driver_data(device); |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1655 | release_region(ec->data_addr, 1); |
| 1656 | release_region(ec->command_addr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | device->driver_data = NULL; |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1658 | if (ec != boot_ec) { |
| 1659 | ec_remove_handlers(ec); |
| 1660 | acpi_ec_free(ec); |
| 1661 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1662 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | } |
| 1664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | static acpi_status |
| 1666 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
| 1667 | { |
| 1668 | struct acpi_ec *ec = context; |
| 1669 | |
| 1670 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
| 1671 | return AE_OK; |
| 1672 | |
| 1673 | /* |
| 1674 | * The first address region returned is the data port, and |
| 1675 | * the second address region returned is the status/command |
| 1676 | * port. |
| 1677 | */ |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1678 | if (ec->data_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | ec->data_addr = resource->data.io.minimum; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1680 | else if (ec->command_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | ec->command_addr = resource->data.io.minimum; |
| 1682 | else |
| 1683 | return AE_CTRL_TERMINATE; |
| 1684 | |
| 1685 | return AE_OK; |
| 1686 | } |
| 1687 | |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1688 | static const struct acpi_device_id ec_device_ids[] = { |
| 1689 | {"PNP0C09", 0}, |
| 1690 | {"", 0}, |
| 1691 | }; |
| 1692 | |
| 1693 | int __init acpi_ec_dsdt_probe(void) |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1694 | { |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1695 | acpi_status status; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1696 | struct acpi_ec *ec; |
| 1697 | int ret; |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1698 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1699 | ec = acpi_ec_alloc(); |
| 1700 | if (!ec) |
| 1701 | return -ENOMEM; |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1702 | /* |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1703 | * At this point, the namespace is initialized, so start to find |
| 1704 | * the namespace objects. |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1705 | */ |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1706 | status = acpi_get_devices(ec_device_ids[0].id, |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1707 | ec_parse_device, ec, NULL); |
| 1708 | if (ACPI_FAILURE(status) || !ec->handle) { |
| 1709 | ret = -ENODEV; |
| 1710 | goto error; |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1711 | } |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1712 | /* |
| 1713 | * When the DSDT EC is available, always re-configure boot EC to |
| 1714 | * have _REG evaluated. _REG can only be evaluated after the |
| 1715 | * namespace initialization. |
| 1716 | * At this point, the GPE is not fully initialized, so do not to |
| 1717 | * handle the events. |
| 1718 | */ |
| 1719 | ret = acpi_config_boot_ec(ec, ec->handle, false, false); |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1720 | error: |
| 1721 | if (ret) |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1722 | acpi_ec_free(ec); |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1723 | return ret; |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1724 | } |
| 1725 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1726 | /* |
| 1727 | * If the DSDT EC is not functioning, we still need to prepare a fully |
| 1728 | * functioning ECDT EC first in order to handle the events. |
| 1729 | * https://bugzilla.kernel.org/show_bug.cgi?id=115021 |
| 1730 | */ |
| 1731 | int __init acpi_ec_ecdt_start(void) |
| 1732 | { |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1733 | acpi_handle handle; |
| 1734 | |
| 1735 | if (!boot_ec) |
| 1736 | return -ENODEV; |
| 1737 | /* |
| 1738 | * The DSDT EC should have already been started in |
| 1739 | * acpi_ec_add(). |
| 1740 | */ |
| 1741 | if (!boot_ec_is_ecdt) |
| 1742 | return -ENODEV; |
| 1743 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1744 | /* |
| 1745 | * At this point, the namespace and the GPE is initialized, so |
| 1746 | * start to find the namespace objects and handle the events. |
| 1747 | */ |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1748 | if (!acpi_ec_ecdt_get_handle(&handle)) |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1749 | return -ENODEV; |
| 1750 | return acpi_config_boot_ec(boot_ec, handle, true, true); |
| 1751 | } |
| 1752 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1753 | #if 0 |
Feng Tang | 67bfa9b | 2012-09-28 15:22:01 +0800 | [diff] [blame] | 1754 | /* |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1755 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
| 1756 | * set, for which case, we complete the QR_EC without issuing it to the |
| 1757 | * firmware. |
| 1758 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 |
| 1759 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1760 | */ |
| 1761 | static int ec_flag_query_handshake(const struct dmi_system_id *id) |
| 1762 | { |
| 1763 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); |
| 1764 | EC_FLAGS_QUERY_HANDSHAKE = 1; |
| 1765 | return 0; |
| 1766 | } |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1767 | #endif |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1768 | |
| 1769 | /* |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1770 | * On some hardware it is necessary to clear events accumulated by the EC during |
| 1771 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too |
| 1772 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) |
| 1773 | * |
| 1774 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 |
| 1775 | * |
| 1776 | * Ideally, the EC should also be instructed NOT to accumulate events during |
| 1777 | * sleep (which Windows seems to do somehow), but the interface to control this |
| 1778 | * behaviour is not known at this time. |
| 1779 | * |
| 1780 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, |
| 1781 | * however it is very likely that other Samsung models are affected. |
| 1782 | * |
| 1783 | * On systems which don't accumulate _Q events during sleep, this extra check |
| 1784 | * should be harmless. |
| 1785 | */ |
| 1786 | static int ec_clear_on_resume(const struct dmi_system_id *id) |
| 1787 | { |
| 1788 | pr_debug("Detected system needing EC poll on resume.\n"); |
| 1789 | EC_FLAGS_CLEAR_ON_RESUME = 1; |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1790 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1791 | return 0; |
| 1792 | } |
| 1793 | |
Lv Zheng | bc53956 | 2016-06-21 17:42:12 +0800 | [diff] [blame] | 1794 | /* |
| 1795 | * Some ECDTs contain wrong register addresses. |
| 1796 | * MSI MS-171F |
| 1797 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 |
| 1798 | */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1799 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
| 1800 | { |
| 1801 | pr_debug("Detected system needing ECDT address correction.\n"); |
| 1802 | EC_FLAGS_CORRECT_ECDT = 1; |
| 1803 | return 0; |
| 1804 | } |
| 1805 | |
Sachin Kamat | 6cef749 | 2013-08-07 17:16:55 +0530 | [diff] [blame] | 1806 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1807 | { |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1808 | ec_correct_ecdt, "MSI MS-171F", { |
Lv Zheng | 3174abc | 2015-05-15 14:37:11 +0800 | [diff] [blame] | 1809 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
| 1810 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, |
Lan Tianyu | 777cb38 | 2014-08-29 10:50:08 +0800 | [diff] [blame] | 1811 | { |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1812 | ec_clear_on_resume, "Samsung hardware", { |
| 1813 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1814 | {}, |
| 1815 | }; |
| 1816 | |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1817 | int __init acpi_ec_ecdt_probe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1819 | int ret; |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1820 | acpi_status status; |
| 1821 | struct acpi_table_ecdt *ecdt_ptr; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1822 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1824 | ec = acpi_ec_alloc(); |
| 1825 | if (!ec) |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1826 | return -ENOMEM; |
| 1827 | /* |
| 1828 | * Generate a boot ec context |
| 1829 | */ |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1830 | dmi_check_system(ec_dmi_table); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1831 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 1832 | (struct acpi_table_header **)&ecdt_ptr); |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1833 | if (ACPI_FAILURE(status)) { |
| 1834 | ret = -ENODEV; |
| 1835 | goto error; |
| 1836 | } |
| 1837 | |
| 1838 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
| 1839 | /* |
| 1840 | * Asus X50GL: |
| 1841 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 |
| 1842 | */ |
| 1843 | ret = -ENODEV; |
| 1844 | goto error; |
| 1845 | } |
| 1846 | |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1847 | if (EC_FLAGS_CORRECT_ECDT) { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1848 | ec->command_addr = ecdt_ptr->data.address; |
| 1849 | ec->data_addr = ecdt_ptr->control.address; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1850 | } else { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1851 | ec->command_addr = ecdt_ptr->control.address; |
| 1852 | ec->data_addr = ecdt_ptr->data.address; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1853 | } |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1854 | ec->gpe = ecdt_ptr->gpe; |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1855 | |
| 1856 | /* |
| 1857 | * At this point, the namespace is not initialized, so do not find |
| 1858 | * the namespace objects, or handle the events. |
| 1859 | */ |
| 1860 | ret = acpi_config_boot_ec(ec, ACPI_ROOT_OBJECT, false, true); |
Alexey Starikovskiy | c5279de | 2008-11-26 17:11:53 -0500 | [diff] [blame] | 1861 | error: |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1862 | if (ret) |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1863 | acpi_ec_free(ec); |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1864 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | } |
| 1866 | |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1867 | #ifdef CONFIG_PM_SLEEP |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 1868 | static int acpi_ec_suspend(struct device *dev) |
| 1869 | { |
| 1870 | struct acpi_ec *ec = |
| 1871 | acpi_driver_data(to_acpi_device(dev)); |
| 1872 | |
| 1873 | if (ec_freeze_events) |
| 1874 | acpi_ec_disable_event(ec); |
| 1875 | return 0; |
| 1876 | } |
| 1877 | |
Lv Zheng | c2b46d6 | 2016-08-03 16:01:36 +0800 | [diff] [blame] | 1878 | static int acpi_ec_resume(struct device *dev) |
| 1879 | { |
| 1880 | struct acpi_ec *ec = |
| 1881 | acpi_driver_data(to_acpi_device(dev)); |
| 1882 | |
| 1883 | acpi_ec_enable_event(ec); |
| 1884 | return 0; |
| 1885 | } |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1886 | #endif |
| 1887 | |
| 1888 | static const struct dev_pm_ops acpi_ec_pm = { |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 1889 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1890 | }; |
| 1891 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1892 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
| 1893 | { |
| 1894 | int result = 0; |
| 1895 | |
| 1896 | if (!strncmp(val, "status", sizeof("status") - 1)) { |
| 1897 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
| 1898 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); |
| 1899 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { |
| 1900 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; |
| 1901 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); |
| 1902 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { |
| 1903 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; |
| 1904 | pr_info("Assuming SCI_EVT clearing on event reads\n"); |
| 1905 | } else |
| 1906 | result = -EINVAL; |
| 1907 | return result; |
| 1908 | } |
| 1909 | |
| 1910 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) |
| 1911 | { |
| 1912 | switch (ec_event_clearing) { |
| 1913 | case ACPI_EC_EVT_TIMING_STATUS: |
| 1914 | return sprintf(buffer, "status"); |
| 1915 | case ACPI_EC_EVT_TIMING_QUERY: |
| 1916 | return sprintf(buffer, "query"); |
| 1917 | case ACPI_EC_EVT_TIMING_EVENT: |
| 1918 | return sprintf(buffer, "event"); |
| 1919 | default: |
| 1920 | return sprintf(buffer, "invalid"); |
| 1921 | } |
| 1922 | return 0; |
| 1923 | } |
| 1924 | |
| 1925 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, |
| 1926 | NULL, 0644); |
| 1927 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); |
| 1928 | |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1929 | static struct acpi_driver acpi_ec_driver = { |
| 1930 | .name = "ec", |
| 1931 | .class = ACPI_EC_CLASS, |
| 1932 | .ids = ec_device_ids, |
| 1933 | .ops = { |
| 1934 | .add = acpi_ec_add, |
| 1935 | .remove = acpi_ec_remove, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1936 | }, |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1937 | .drv.pm = &acpi_ec_pm, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1938 | }; |
| 1939 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1940 | static inline int acpi_ec_query_init(void) |
| 1941 | { |
| 1942 | if (!ec_query_wq) { |
| 1943 | ec_query_wq = alloc_workqueue("kec_query", 0, |
| 1944 | ec_max_queries); |
| 1945 | if (!ec_query_wq) |
| 1946 | return -ENODEV; |
| 1947 | } |
| 1948 | return 0; |
| 1949 | } |
| 1950 | |
| 1951 | static inline void acpi_ec_query_exit(void) |
| 1952 | { |
| 1953 | if (ec_query_wq) { |
| 1954 | destroy_workqueue(ec_query_wq); |
| 1955 | ec_query_wq = NULL; |
| 1956 | } |
| 1957 | } |
| 1958 | |
Bjorn Helgaas | a5f820f | 2009-03-24 16:49:48 -0600 | [diff] [blame] | 1959 | int __init acpi_ec_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | { |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1961 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1963 | /* register workqueue for _Qxx evaluations */ |
| 1964 | result = acpi_ec_query_init(); |
| 1965 | if (result) |
| 1966 | goto err_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | /* Now register the driver for the EC */ |
| 1968 | result = acpi_bus_register_driver(&acpi_ec_driver); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1969 | if (result) |
| 1970 | goto err_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1972 | err_exit: |
| 1973 | if (result) |
| 1974 | acpi_ec_query_exit(); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1975 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | } |
| 1977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | /* EC driver currently not unloadable */ |
| 1979 | #if 0 |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1980 | static void __exit acpi_ec_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | |
| 1983 | acpi_bus_unregister_driver(&acpi_ec_driver); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1984 | acpi_ec_query_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | } |
Alexey Starikovskiy | 7843932 | 2007-10-22 14:18:43 +0400 | [diff] [blame] | 1986 | #endif /* 0 */ |