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 | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 112 | EC_FLAGS_STARTED, /* Driver is started */ |
| 113 | EC_FLAGS_STOPPED, /* Driver is stopped */ |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 114 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
| 115 | * current command processing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | }; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 117 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 118 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
| 119 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ |
| 120 | |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 121 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
| 122 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; |
| 123 | module_param(ec_delay, uint, 0644); |
| 124 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); |
| 125 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 126 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
| 127 | module_param(ec_max_queries, uint, 0644); |
| 128 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); |
| 129 | |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 130 | static bool ec_busy_polling __read_mostly; |
| 131 | module_param(ec_busy_polling, bool, 0644); |
| 132 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); |
| 133 | |
| 134 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; |
| 135 | module_param(ec_polling_guard, uint, 0644); |
| 136 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); |
| 137 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 138 | 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] | 139 | |
Feng Tang | a520d52 | 2012-09-28 15:22:00 +0800 | [diff] [blame] | 140 | /* |
| 141 | * If the number of false interrupts per one transaction exceeds |
| 142 | * this threshold, will think there is a GPE storm happened and |
| 143 | * will disable the GPE for normal transaction. |
| 144 | */ |
| 145 | static unsigned int ec_storm_threshold __read_mostly = 8; |
| 146 | module_param(ec_storm_threshold, uint, 0644); |
| 147 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); |
| 148 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 149 | struct acpi_ec_query_handler { |
| 150 | struct list_head node; |
| 151 | acpi_ec_query_func func; |
| 152 | acpi_handle handle; |
| 153 | void *data; |
| 154 | u8 query_bit; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 155 | struct kref kref; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 156 | }; |
| 157 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 158 | struct transaction { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 159 | const u8 *wdata; |
| 160 | u8 *rdata; |
| 161 | unsigned short irq_count; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 162 | u8 command; |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 163 | u8 wi; |
| 164 | u8 ri; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 165 | u8 wlen; |
| 166 | u8 rlen; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 167 | u8 flags; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 168 | }; |
| 169 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 170 | struct acpi_ec_query { |
| 171 | struct transaction transaction; |
| 172 | struct work_struct work; |
| 173 | struct acpi_ec_query_handler *handler; |
| 174 | }; |
| 175 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 176 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 177 | static void advance_transaction(struct acpi_ec *ec); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 178 | static void acpi_ec_event_handler(struct work_struct *work); |
| 179 | static void acpi_ec_event_processor(struct work_struct *work); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 180 | |
Thomas Renninger | 1195a09 | 2010-07-16 13:11:31 +0200 | [diff] [blame] | 181 | struct acpi_ec *boot_ec, *first_ec; |
| 182 | EXPORT_SYMBOL(first_ec); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 183 | static struct workqueue_struct *ec_query_wq; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 184 | |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 185 | 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] | 186 | 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] | 187 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
Alexey Starikovskiy | 5423a0c | 2009-02-21 12:18:13 -0500 | [diff] [blame] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | /* -------------------------------------------------------------------------- |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 190 | * Logging/Debugging |
| 191 | * -------------------------------------------------------------------------- */ |
| 192 | |
| 193 | /* |
| 194 | * Splitters used by the developers to track the boundary of the EC |
| 195 | * handling processes. |
| 196 | */ |
| 197 | #ifdef DEBUG |
| 198 | #define EC_DBG_SEP " " |
| 199 | #define EC_DBG_DRV "+++++" |
| 200 | #define EC_DBG_STM "=====" |
| 201 | #define EC_DBG_REQ "*****" |
| 202 | #define EC_DBG_EVT "#####" |
| 203 | #else |
| 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 | #endif |
| 210 | |
| 211 | #define ec_log_raw(fmt, ...) \ |
| 212 | pr_info(fmt "\n", ##__VA_ARGS__) |
| 213 | #define ec_dbg_raw(fmt, ...) \ |
| 214 | pr_debug(fmt "\n", ##__VA_ARGS__) |
| 215 | #define ec_log(filter, fmt, ...) \ |
| 216 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 217 | #define ec_dbg(filter, fmt, ...) \ |
| 218 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 219 | |
| 220 | #define ec_log_drv(fmt, ...) \ |
| 221 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 222 | #define ec_dbg_drv(fmt, ...) \ |
| 223 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 224 | #define ec_dbg_stm(fmt, ...) \ |
| 225 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) |
| 226 | #define ec_dbg_req(fmt, ...) \ |
| 227 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) |
| 228 | #define ec_dbg_evt(fmt, ...) \ |
| 229 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 230 | #define ec_dbg_ref(ec, fmt, ...) \ |
| 231 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 232 | |
| 233 | /* -------------------------------------------------------------------------- |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 234 | * Device Flags |
| 235 | * -------------------------------------------------------------------------- */ |
| 236 | |
| 237 | static bool acpi_ec_started(struct acpi_ec *ec) |
| 238 | { |
| 239 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 240 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); |
| 241 | } |
| 242 | |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 243 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
| 244 | { |
| 245 | /* |
| 246 | * There is an OSPM early stage logic. During the early stages |
| 247 | * (boot/resume), OSPMs shouldn't enable the event handling, only |
| 248 | * the EC transactions are allowed to be performed. |
| 249 | */ |
| 250 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 251 | return false; |
| 252 | /* |
| 253 | * The EC event handling is automatically disabled as soon as the |
| 254 | * EC driver is stopped. |
| 255 | */ |
| 256 | return test_bit(EC_FLAGS_STARTED, &ec->flags); |
| 257 | } |
| 258 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 259 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
| 260 | { |
| 261 | return ec->reference_count == 1; |
| 262 | } |
| 263 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 264 | /* -------------------------------------------------------------------------- |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 265 | * EC Registers |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 266 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 268 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 270 | u8 x = inb(ec->command_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 271 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 272 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
| 273 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", |
| 274 | x, |
| 275 | !!(x & ACPI_EC_FLAG_SCI), |
| 276 | !!(x & ACPI_EC_FLAG_BURST), |
| 277 | !!(x & ACPI_EC_FLAG_CMD), |
| 278 | !!(x & ACPI_EC_FLAG_IBF), |
| 279 | !!(x & ACPI_EC_FLAG_OBF)); |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 280 | return x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 283 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 284 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 285 | u8 x = inb(ec->data_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 286 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 287 | ec->timestamp = jiffies; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 288 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 289 | return x; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 290 | } |
| 291 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 292 | 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] | 293 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 294 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 295 | outb(command, ec->command_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 296 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 297 | } |
| 298 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 299 | 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] | 300 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 301 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 302 | outb(data, ec->data_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 303 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 304 | } |
| 305 | |
Lv Zheng | e34c0e2 | 2014-10-14 14:23:49 +0800 | [diff] [blame] | 306 | #ifdef DEBUG |
| 307 | static const char *acpi_ec_cmd_string(u8 cmd) |
| 308 | { |
| 309 | switch (cmd) { |
| 310 | case 0x80: |
| 311 | return "RD_EC"; |
| 312 | case 0x81: |
| 313 | return "WR_EC"; |
| 314 | case 0x82: |
| 315 | return "BE_EC"; |
| 316 | case 0x83: |
| 317 | return "BD_EC"; |
| 318 | case 0x84: |
| 319 | return "QR_EC"; |
| 320 | } |
| 321 | return "UNKNOWN"; |
| 322 | } |
| 323 | #else |
| 324 | #define acpi_ec_cmd_string(cmd) "UNDEF" |
| 325 | #endif |
| 326 | |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 327 | /* -------------------------------------------------------------------------- |
| 328 | * GPE Registers |
| 329 | * -------------------------------------------------------------------------- */ |
| 330 | |
| 331 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) |
| 332 | { |
| 333 | acpi_event_status gpe_status = 0; |
| 334 | |
| 335 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); |
Lv Zheng | 7c0b259 | 2015-05-15 14:16:17 +0800 | [diff] [blame] | 336 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) |
| 340 | { |
| 341 | if (open) |
| 342 | acpi_enable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 343 | else { |
| 344 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 345 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 346 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 347 | if (acpi_ec_is_gpe_raised(ec)) { |
| 348 | /* |
| 349 | * On some platforms, EN=1 writes cannot trigger GPE. So |
| 350 | * software need to manually trigger a pseudo GPE event on |
| 351 | * EN=1 writes. |
| 352 | */ |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 353 | ec_dbg_raw("Polling quirk"); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 354 | advance_transaction(ec); |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) |
| 359 | { |
| 360 | if (close) |
| 361 | acpi_disable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 362 | else { |
| 363 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 364 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 365 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) |
| 369 | { |
| 370 | /* |
| 371 | * GPE STS is a W1C register, which means: |
| 372 | * 1. Software can clear it without worrying about clearing other |
| 373 | * GPEs' STS bits when the hardware sets them in parallel. |
| 374 | * 2. As long as software can ensure only clearing it when it is |
| 375 | * set, hardware won't set it in parallel. |
| 376 | * So software can clear GPE in any contexts. |
| 377 | * Warning: do not move the check into advance_transaction() as the |
| 378 | * EC commands will be sent without GPE raised. |
| 379 | */ |
| 380 | if (!acpi_ec_is_gpe_raised(ec)) |
| 381 | return; |
| 382 | acpi_clear_gpe(NULL, ec->gpe); |
| 383 | } |
| 384 | |
| 385 | /* -------------------------------------------------------------------------- |
| 386 | * Transaction Management |
| 387 | * -------------------------------------------------------------------------- */ |
| 388 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 389 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
| 390 | { |
| 391 | ec->reference_count++; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 392 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 393 | ec->reference_count == 1) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 394 | acpi_ec_enable_gpe(ec, true); |
| 395 | } |
| 396 | |
| 397 | static void acpi_ec_complete_request(struct acpi_ec *ec) |
| 398 | { |
| 399 | bool flushed = false; |
| 400 | |
| 401 | ec->reference_count--; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 402 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 403 | ec->reference_count == 0) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 404 | acpi_ec_disable_gpe(ec, true); |
| 405 | flushed = acpi_ec_flushed(ec); |
| 406 | if (flushed) |
| 407 | wake_up(&ec->wait); |
| 408 | } |
| 409 | |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 410 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
| 411 | { |
| 412 | if (!test_bit(flag, &ec->flags)) { |
| 413 | acpi_ec_disable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 414 | ec_dbg_drv("Polling enabled"); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 415 | set_bit(flag, &ec->flags); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) |
| 420 | { |
| 421 | if (test_bit(flag, &ec->flags)) { |
| 422 | clear_bit(flag, &ec->flags); |
| 423 | acpi_ec_enable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 424 | ec_dbg_drv("Polling disabled"); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 425 | } |
| 426 | } |
| 427 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 428 | /* |
| 429 | * acpi_ec_submit_flushable_request() - Increase the reference count unless |
| 430 | * the flush operation is not in |
| 431 | * progress |
| 432 | * @ec: the EC device |
| 433 | * |
| 434 | * This function must be used before taking a new action that should hold |
| 435 | * the reference count. If this function returns false, then the action |
| 436 | * must be discarded or it will prevent the flush operation from being |
| 437 | * completed. |
| 438 | */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 439 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 440 | { |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 441 | if (!acpi_ec_started(ec)) |
| 442 | return false; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 443 | acpi_ec_submit_request(ec); |
| 444 | return true; |
| 445 | } |
| 446 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 447 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 448 | { |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 449 | if (acpi_ec_event_enabled(ec) && |
| 450 | !test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 451 | ec_dbg_evt("Command(%s) submitted/blocked", |
| 452 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
| 453 | ec->nr_pending_queries++; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 454 | schedule_work(&ec->work); |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 455 | } |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 456 | } |
| 457 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 458 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 459 | { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 460 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 461 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 462 | ec_dbg_evt("Command(%s) unblocked", |
| 463 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 464 | } |
| 465 | } |
| 466 | |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 467 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
| 468 | { |
| 469 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 470 | ec_log_drv("event unblocked"); |
Lv Zheng | e923e8e | 2016-08-03 16:01:30 +0800 | [diff] [blame^] | 471 | if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
| 472 | advance_transaction(ec); |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) |
| 476 | { |
| 477 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 478 | ec_log_drv("event blocked"); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Process _Q events that might have accumulated in the EC. |
| 483 | * Run with locked ec mutex. |
| 484 | */ |
| 485 | static void acpi_ec_clear(struct acpi_ec *ec) |
| 486 | { |
| 487 | int i, status; |
| 488 | u8 value = 0; |
| 489 | |
| 490 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { |
| 491 | status = acpi_ec_query(ec, &value); |
| 492 | if (status || !value) |
| 493 | break; |
| 494 | } |
| 495 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) |
| 496 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); |
| 497 | else |
| 498 | pr_info("%d stale EC events cleared\n", i); |
| 499 | } |
| 500 | |
| 501 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
| 502 | { |
| 503 | unsigned long flags; |
| 504 | |
| 505 | spin_lock_irqsave(&ec->lock, flags); |
| 506 | if (acpi_ec_started(ec)) |
| 507 | __acpi_ec_enable_event(ec); |
| 508 | spin_unlock_irqrestore(&ec->lock, flags); |
| 509 | |
| 510 | /* Drain additional events if hardware requires that */ |
| 511 | if (EC_FLAGS_CLEAR_ON_RESUME) |
| 512 | acpi_ec_clear(ec); |
| 513 | } |
| 514 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 515 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
| 516 | { |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 517 | bool guarded = true; |
| 518 | unsigned long flags; |
| 519 | |
| 520 | spin_lock_irqsave(&ec->lock, flags); |
| 521 | /* |
| 522 | * If firmware SCI_EVT clearing timing is "event", we actually |
| 523 | * don't know when the SCI_EVT will be cleared by firmware after |
| 524 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an |
| 525 | * acceptable period. |
| 526 | * |
| 527 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is |
| 528 | * flagged, which means SCI_EVT check has just been performed. |
| 529 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the |
| 530 | * guarding should have already been performed (via |
| 531 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the |
| 532 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into |
| 533 | * ACPI_EC_COMMAND_POLL state immediately. |
| 534 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 535 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 536 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || |
| 537 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || |
| 538 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 539 | guarded = false; |
| 540 | spin_unlock_irqrestore(&ec->lock, flags); |
| 541 | return guarded; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 542 | } |
| 543 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 544 | static int ec_transaction_polled(struct acpi_ec *ec) |
| 545 | { |
| 546 | unsigned long flags; |
| 547 | int ret = 0; |
| 548 | |
| 549 | spin_lock_irqsave(&ec->lock, flags); |
| 550 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) |
| 551 | ret = 1; |
| 552 | spin_unlock_irqrestore(&ec->lock, flags); |
| 553 | return ret; |
| 554 | } |
| 555 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 556 | static int ec_transaction_completed(struct acpi_ec *ec) |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 557 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 558 | unsigned long flags; |
| 559 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 560 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 561 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 562 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 563 | ret = 1; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 564 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 565 | return ret; |
| 566 | } |
Denis M. Sadykov | 7c6db5e | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 567 | |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 568 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
| 569 | { |
| 570 | ec->curr->flags |= flag; |
| 571 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 572 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
| 573 | flag == ACPI_EC_COMMAND_POLL) |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 574 | acpi_ec_complete_query(ec); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 575 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && |
| 576 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 577 | acpi_ec_complete_query(ec); |
| 578 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
| 579 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 580 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 581 | } |
| 582 | } |
| 583 | |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 584 | static void advance_transaction(struct acpi_ec *ec) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 585 | { |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 586 | struct transaction *t; |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 587 | u8 status; |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 588 | bool wakeup = false; |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 589 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 590 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
| 591 | smp_processor_id()); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 592 | /* |
| 593 | * By always clearing STS before handling all indications, we can |
| 594 | * ensure a hardware STS 0->1 change after this clearing can always |
| 595 | * trigger a GPE interrupt. |
| 596 | */ |
| 597 | acpi_ec_clear_gpe(ec); |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 598 | status = acpi_ec_read_status(ec); |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 599 | t = ec->curr; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 600 | /* |
| 601 | * Another IRQ or a guarded polling mode advancement is detected, |
| 602 | * the next QR_EC submission is then allowed. |
| 603 | */ |
| 604 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { |
| 605 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 606 | (!ec->nr_pending_queries || |
| 607 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 608 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
| 609 | acpi_ec_complete_query(ec); |
| 610 | } |
| 611 | } |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 612 | if (!t) |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 613 | goto err; |
| 614 | if (t->flags & ACPI_EC_COMMAND_POLL) { |
| 615 | if (t->wlen > t->wi) { |
| 616 | if ((status & ACPI_EC_FLAG_IBF) == 0) |
| 617 | acpi_ec_write_data(ec, t->wdata[t->wi++]); |
| 618 | else |
| 619 | goto err; |
| 620 | } else if (t->rlen > t->ri) { |
| 621 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
| 622 | t->rdata[t->ri++] = acpi_ec_read_data(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 623 | if (t->rlen == t->ri) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 624 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 625 | if (t->command == ACPI_EC_COMMAND_QUERY) |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 626 | ec_dbg_evt("Command(%s) completed by hardware", |
| 627 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 628 | wakeup = true; |
| 629 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 630 | } else |
| 631 | goto err; |
| 632 | } else if (t->wlen == t->wi && |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 633 | (status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 634 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 635 | wakeup = true; |
| 636 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 637 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 638 | } else { |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 639 | if (EC_FLAGS_QUERY_HANDSHAKE && |
| 640 | !(status & ACPI_EC_FLAG_SCI) && |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 641 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 642 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 643 | t->rdata[t->ri++] = 0x00; |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 644 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 645 | ec_dbg_evt("Command(%s) completed by software", |
| 646 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 647 | wakeup = true; |
| 648 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 649 | acpi_ec_write_cmd(ec, t->command); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 650 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 651 | } else |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 652 | goto err; |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 653 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 654 | } |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 655 | err: |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 656 | /* |
| 657 | * If SCI bit is set, then don't think it's a false IRQ |
| 658 | * otherwise will take a not handled IRQ as a false one. |
| 659 | */ |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 660 | if (!(status & ACPI_EC_FLAG_SCI)) { |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 661 | if (in_interrupt() && t) { |
| 662 | if (t->irq_count < ec_storm_threshold) |
| 663 | ++t->irq_count; |
| 664 | /* Allow triggering on 0 threshold */ |
| 665 | if (t->irq_count == ec_storm_threshold) |
| 666 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); |
| 667 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 668 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 669 | out: |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 670 | if (status & ACPI_EC_FLAG_SCI) |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 671 | acpi_ec_submit_query(ec); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 672 | if (wakeup && in_interrupt()) |
| 673 | wake_up(&ec->wait); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 674 | } |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 675 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 676 | static void start_transaction(struct acpi_ec *ec) |
| 677 | { |
| 678 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; |
| 679 | ec->curr->flags = 0; |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | static int ec_guard(struct acpi_ec *ec) |
| 683 | { |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 684 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 685 | unsigned long timeout = ec->timestamp + guard; |
| 686 | |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 687 | /* Ensure guarding period before polling EC status */ |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 688 | do { |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 689 | if (ec_busy_polling) { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 690 | /* Perform busy polling */ |
| 691 | if (ec_transaction_completed(ec)) |
| 692 | return 0; |
| 693 | udelay(jiffies_to_usecs(guard)); |
| 694 | } else { |
| 695 | /* |
| 696 | * Perform wait polling |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 697 | * 1. Wait the transaction to be completed by the |
| 698 | * GPE handler after the transaction enters |
| 699 | * ACPI_EC_COMMAND_POLL state. |
| 700 | * 2. A special guarding logic is also required |
| 701 | * for event clearing mode "event" before the |
| 702 | * transaction enters ACPI_EC_COMMAND_POLL |
| 703 | * state. |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 704 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 705 | if (!ec_transaction_polled(ec) && |
| 706 | !acpi_ec_guard_event(ec)) |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 707 | break; |
| 708 | if (wait_event_timeout(ec->wait, |
| 709 | ec_transaction_completed(ec), |
| 710 | guard)) |
| 711 | return 0; |
| 712 | } |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 713 | } while (time_before(jiffies, timeout)); |
| 714 | return -ETIME; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 715 | } |
| 716 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 717 | static int ec_poll(struct acpi_ec *ec) |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 718 | { |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 719 | unsigned long flags; |
Lan Tianyu | 28fe5c8 | 2013-05-06 03:23:40 +0000 | [diff] [blame] | 720 | int repeat = 5; /* number of command restarts */ |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 721 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 722 | while (repeat--) { |
| 723 | unsigned long delay = jiffies + |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 724 | msecs_to_jiffies(ec_delay); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 725 | do { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 726 | if (!ec_guard(ec)) |
| 727 | return 0; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 728 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 729 | advance_transaction(ec); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 730 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 731 | } while (time_before(jiffies, delay)); |
Lan Tianyu | 16a26e8 | 2013-09-12 03:32:04 -0400 | [diff] [blame] | 732 | pr_debug("controller reset, restart transaction\n"); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 733 | spin_lock_irqsave(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 734 | start_transaction(ec); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 735 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | af3fd14 | 2006-12-07 18:42:16 +0300 | [diff] [blame] | 736 | } |
Alexey Starikovskiy | b77d81b | 2008-03-21 17:07:15 +0300 | [diff] [blame] | 737 | return -ETIME; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 738 | } |
| 739 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 740 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 741 | struct transaction *t) |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 742 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 743 | unsigned long tmp; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 744 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 745 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 746 | /* start transaction */ |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 747 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 748 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 749 | if (!acpi_ec_submit_flushable_request(ec)) { |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 750 | ret = -EINVAL; |
| 751 | goto unlock; |
| 752 | } |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 753 | ec_dbg_ref(ec, "Increase command"); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 754 | /* following two actions should be kept atomic */ |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 755 | ec->curr = t; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 756 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 757 | start_transaction(ec); |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 758 | spin_unlock_irqrestore(&ec->lock, tmp); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 759 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 760 | ret = ec_poll(ec); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 761 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 762 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 763 | if (t->irq_count == ec_storm_threshold) |
| 764 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 765 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 766 | ec->curr = NULL; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 767 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
| 768 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 769 | ec_dbg_ref(ec, "Decrease command"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 770 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 771 | spin_unlock_irqrestore(&ec->lock, tmp); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 772 | return ret; |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 773 | } |
| 774 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 775 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 776 | { |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 777 | int status; |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 778 | u32 glk; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 779 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 780 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 781 | return -EINVAL; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 782 | if (t->rdata) |
| 783 | memset(t->rdata, 0, t->rlen); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 784 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 785 | mutex_lock(&ec->mutex); |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 786 | if (ec->global_lock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 788 | if (ACPI_FAILURE(status)) { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 789 | status = -ENODEV; |
| 790 | goto unlock; |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 791 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 793 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 794 | status = acpi_ec_transaction_unlocked(ec, t); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 795 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 796 | if (ec->global_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | acpi_release_global_lock(glk); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 798 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 799 | mutex_unlock(&ec->mutex); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 800 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
| 802 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 803 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 804 | { |
| 805 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 806 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
| 807 | .wdata = NULL, .rdata = &d, |
| 808 | .wlen = 0, .rlen = 1}; |
| 809 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 810 | return acpi_ec_transaction(ec, &t); |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 811 | } |
| 812 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 813 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 814 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 815 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
| 816 | .wdata = NULL, .rdata = NULL, |
| 817 | .wlen = 0, .rlen = 0}; |
| 818 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 819 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 820 | acpi_ec_transaction(ec, &t) : 0; |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 821 | } |
| 822 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 823 | 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] | 824 | { |
| 825 | int result; |
| 826 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 827 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
| 828 | .wdata = &address, .rdata = &d, |
| 829 | .wlen = 1, .rlen = 1}; |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 830 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 831 | result = acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 832 | *data = d; |
| 833 | return result; |
| 834 | } |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 835 | |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 836 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
| 837 | { |
Alexey Starikovskiy | 6ccedb1 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 838 | u8 wdata[2] = { address, data }; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 839 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
| 840 | .wdata = wdata, .rdata = NULL, |
| 841 | .wlen = 2, .rlen = 0}; |
| 842 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 843 | return acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 844 | } |
| 845 | |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 846 | int ec_read(u8 addr, u8 *val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | int err; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 849 | u8 temp_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
| 851 | if (!first_ec) |
| 852 | return -ENODEV; |
| 853 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 854 | err = acpi_ec_read(first_ec, addr, &temp_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | if (!err) { |
| 857 | *val = temp_data; |
| 858 | return 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 859 | } |
| 860 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | EXPORT_SYMBOL(ec_read); |
| 863 | |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 864 | int ec_write(u8 addr, u8 val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | int err; |
| 867 | |
| 868 | if (!first_ec) |
| 869 | return -ENODEV; |
| 870 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 871 | err = acpi_ec_write(first_ec, addr, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | return err; |
| 874 | } |
| 875 | EXPORT_SYMBOL(ec_write); |
| 876 | |
Randy Dunlap | 616362d | 2006-10-27 01:47:34 -0400 | [diff] [blame] | 877 | int ec_transaction(u8 command, |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 878 | const u8 *wdata, unsigned wdata_len, |
| 879 | u8 *rdata, unsigned rdata_len) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 880 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 881 | struct transaction t = {.command = command, |
| 882 | .wdata = wdata, .rdata = rdata, |
| 883 | .wlen = wdata_len, .rlen = rdata_len}; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 884 | |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 885 | if (!first_ec) |
| 886 | return -ENODEV; |
| 887 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 888 | return acpi_ec_transaction(first_ec, &t); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 889 | } |
Lennart Poettering | ab9e43c | 2006-10-03 22:49:00 -0400 | [diff] [blame] | 890 | EXPORT_SYMBOL(ec_transaction); |
| 891 | |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 892 | /* Get the handle to the EC device */ |
| 893 | acpi_handle ec_get_handle(void) |
| 894 | { |
| 895 | if (!first_ec) |
| 896 | return NULL; |
| 897 | return first_ec->handle; |
| 898 | } |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 899 | EXPORT_SYMBOL(ec_get_handle); |
| 900 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 901 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
| 902 | { |
| 903 | unsigned long flags; |
| 904 | |
| 905 | spin_lock_irqsave(&ec->lock, flags); |
| 906 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 907 | ec_dbg_drv("Starting EC"); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 908 | /* Enable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 909 | if (!resuming) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 910 | acpi_ec_submit_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 911 | ec_dbg_ref(ec, "Increase driver"); |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 912 | } else |
| 913 | __acpi_ec_enable_event(ec); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 914 | ec_log_drv("EC started"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 915 | } |
| 916 | spin_unlock_irqrestore(&ec->lock, flags); |
| 917 | } |
| 918 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 919 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
| 920 | { |
| 921 | unsigned long flags; |
| 922 | bool flushed; |
| 923 | |
| 924 | spin_lock_irqsave(&ec->lock, flags); |
| 925 | flushed = acpi_ec_flushed(ec); |
| 926 | spin_unlock_irqrestore(&ec->lock, flags); |
| 927 | return flushed; |
| 928 | } |
| 929 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 930 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
| 931 | { |
| 932 | unsigned long flags; |
| 933 | |
| 934 | spin_lock_irqsave(&ec->lock, flags); |
| 935 | if (acpi_ec_started(ec)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 936 | ec_dbg_drv("Stopping EC"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 937 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 938 | spin_unlock_irqrestore(&ec->lock, flags); |
| 939 | wait_event(ec->wait, acpi_ec_stopped(ec)); |
| 940 | spin_lock_irqsave(&ec->lock, flags); |
| 941 | /* Disable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 942 | if (!suspending) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 943 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 944 | ec_dbg_ref(ec, "Decrease driver"); |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 945 | } else |
| 946 | __acpi_ec_disable_event(ec); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 947 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
| 948 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 949 | ec_log_drv("EC stopped"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 950 | } |
| 951 | spin_unlock_irqrestore(&ec->lock, flags); |
| 952 | } |
| 953 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 954 | void acpi_ec_block_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 955 | { |
| 956 | struct acpi_ec *ec = first_ec; |
| 957 | |
| 958 | if (!ec) |
| 959 | return; |
| 960 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 961 | mutex_lock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 962 | /* Prevent transactions from being carried out */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 963 | acpi_ec_stop(ec, true); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 964 | mutex_unlock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 965 | } |
| 966 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 967 | void acpi_ec_unblock_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 968 | { |
| 969 | struct acpi_ec *ec = first_ec; |
| 970 | |
| 971 | if (!ec) |
| 972 | return; |
| 973 | |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 974 | /* Allow transactions to be carried out again */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 975 | acpi_ec_start(ec, true); |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 976 | |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 977 | acpi_ec_enable_event(ec); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 978 | } |
| 979 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 980 | void acpi_ec_unblock_transactions_early(void) |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 981 | { |
| 982 | /* |
| 983 | * Allow transactions to happen again (this function is called from |
| 984 | * atomic context during wakeup, so we don't need to acquire the mutex). |
| 985 | */ |
| 986 | if (first_ec) |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 987 | acpi_ec_start(first_ec, true); |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 988 | } |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | /* -------------------------------------------------------------------------- |
| 991 | Event Management |
| 992 | -------------------------------------------------------------------------- */ |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 993 | static struct acpi_ec_query_handler * |
| 994 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) |
| 995 | { |
| 996 | if (handler) |
| 997 | kref_get(&handler->kref); |
| 998 | return handler; |
| 999 | } |
| 1000 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1001 | static struct acpi_ec_query_handler * |
| 1002 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) |
| 1003 | { |
| 1004 | struct acpi_ec_query_handler *handler; |
| 1005 | bool found = false; |
| 1006 | |
| 1007 | mutex_lock(&ec->mutex); |
| 1008 | list_for_each_entry(handler, &ec->list, node) { |
| 1009 | if (value == handler->query_bit) { |
| 1010 | found = true; |
| 1011 | break; |
| 1012 | } |
| 1013 | } |
| 1014 | mutex_unlock(&ec->mutex); |
| 1015 | return found ? acpi_ec_get_query_handler(handler) : NULL; |
| 1016 | } |
| 1017 | |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1018 | static void acpi_ec_query_handler_release(struct kref *kref) |
| 1019 | { |
| 1020 | struct acpi_ec_query_handler *handler = |
| 1021 | container_of(kref, struct acpi_ec_query_handler, kref); |
| 1022 | |
| 1023 | kfree(handler); |
| 1024 | } |
| 1025 | |
| 1026 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) |
| 1027 | { |
| 1028 | kref_put(&handler->kref, acpi_ec_query_handler_release); |
| 1029 | } |
| 1030 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1031 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
| 1032 | acpi_handle handle, acpi_ec_query_func func, |
| 1033 | void *data) |
| 1034 | { |
| 1035 | struct acpi_ec_query_handler *handler = |
| 1036 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1037 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1038 | if (!handler) |
| 1039 | return -ENOMEM; |
| 1040 | |
| 1041 | handler->query_bit = query_bit; |
| 1042 | handler->handle = handle; |
| 1043 | handler->func = func; |
| 1044 | handler->data = data; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1045 | mutex_lock(&ec->mutex); |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1046 | kref_init(&handler->kref); |
Alexey Starikovskiy | 30c0857 | 2007-09-26 19:43:22 +0400 | [diff] [blame] | 1047 | list_add(&handler->node, &ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1048 | mutex_unlock(&ec->mutex); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1049 | return 0; |
| 1050 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1051 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
| 1052 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1053 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
| 1054 | bool remove_all, u8 query_bit) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1055 | { |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1056 | struct acpi_ec_query_handler *handler, *tmp; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1057 | LIST_HEAD(free_list); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1058 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1059 | mutex_lock(&ec->mutex); |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1060 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1061 | if (remove_all || query_bit == handler->query_bit) { |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1062 | list_del_init(&handler->node); |
| 1063 | list_add(&handler->node, &free_list); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1064 | } |
| 1065 | } |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1066 | mutex_unlock(&ec->mutex); |
Chris Bainbridge | 6b5eab5 | 2015-04-22 00:25:36 +0100 | [diff] [blame] | 1067 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1068 | acpi_ec_put_query_handler(handler); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1069 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1070 | |
| 1071 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) |
| 1072 | { |
| 1073 | acpi_ec_remove_query_handlers(ec, false, query_bit); |
| 1074 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1075 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1077 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | { |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1079 | struct acpi_ec_query *q; |
| 1080 | struct transaction *t; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1081 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1082 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); |
| 1083 | if (!q) |
| 1084 | return NULL; |
| 1085 | INIT_WORK(&q->work, acpi_ec_event_processor); |
| 1086 | t = &q->transaction; |
| 1087 | t->command = ACPI_EC_COMMAND_QUERY; |
| 1088 | t->rdata = pval; |
| 1089 | t->rlen = 1; |
| 1090 | return q; |
| 1091 | } |
| 1092 | |
| 1093 | static void acpi_ec_delete_query(struct acpi_ec_query *q) |
| 1094 | { |
| 1095 | if (q) { |
| 1096 | if (q->handler) |
| 1097 | acpi_ec_put_query_handler(q->handler); |
| 1098 | kfree(q); |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | static void acpi_ec_event_processor(struct work_struct *work) |
| 1103 | { |
| 1104 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); |
| 1105 | struct acpi_ec_query_handler *handler = q->handler; |
| 1106 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1107 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1108 | if (handler->func) |
| 1109 | handler->func(handler->data); |
| 1110 | else if (handler->handle) |
| 1111 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1112 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1113 | acpi_ec_delete_query(q); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1114 | } |
| 1115 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1116 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1117 | { |
| 1118 | u8 value = 0; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1119 | int result; |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1120 | struct acpi_ec_query *q; |
| 1121 | |
| 1122 | q = acpi_ec_create_query(&value); |
| 1123 | if (!q) |
| 1124 | return -ENOMEM; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1125 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1126 | /* |
| 1127 | * Query the EC to find out which _Qxx method we need to evaluate. |
| 1128 | * Note that successful completion of the query causes the ACPI_EC_SCI |
| 1129 | * bit to be cleared (and thus clearing the interrupt source). |
| 1130 | */ |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1131 | result = acpi_ec_transaction(ec, &q->transaction); |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1132 | if (!value) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1133 | result = -ENODATA; |
| 1134 | if (result) |
| 1135 | goto err_exit; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1136 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1137 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
| 1138 | if (!q->handler) { |
| 1139 | result = -ENODATA; |
| 1140 | goto err_exit; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1141 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1142 | |
| 1143 | /* |
| 1144 | * It is reported that _Qxx are evaluated in a parallel way on |
| 1145 | * Windows: |
| 1146 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 |
| 1147 | * |
| 1148 | * Put this log entry before schedule_work() in order to make |
| 1149 | * it appearing before any other log entries occurred during the |
| 1150 | * work queue execution. |
| 1151 | */ |
| 1152 | ec_dbg_evt("Query(0x%02x) scheduled", value); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1153 | if (!queue_work(ec_query_wq, &q->work)) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1154 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
| 1155 | result = -EBUSY; |
| 1156 | } |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1157 | |
| 1158 | err_exit: |
Markus Elfring | 4981c2b | 2015-11-15 22:42:27 +0100 | [diff] [blame] | 1159 | if (result) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1160 | acpi_ec_delete_query(q); |
| 1161 | if (data) |
| 1162 | *data = value; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1163 | return result; |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1164 | } |
| 1165 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1166 | static void acpi_ec_check_event(struct acpi_ec *ec) |
| 1167 | { |
| 1168 | unsigned long flags; |
| 1169 | |
| 1170 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { |
| 1171 | if (ec_guard(ec)) { |
| 1172 | spin_lock_irqsave(&ec->lock, flags); |
| 1173 | /* |
| 1174 | * Take care of the SCI_EVT unless no one else is |
| 1175 | * taking care of it. |
| 1176 | */ |
| 1177 | if (!ec->curr) |
| 1178 | advance_transaction(ec); |
| 1179 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1180 | } |
| 1181 | } |
| 1182 | } |
| 1183 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1184 | static void acpi_ec_event_handler(struct work_struct *work) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1185 | { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1186 | unsigned long flags; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 1187 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1188 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1189 | ec_dbg_evt("Event started"); |
| 1190 | |
| 1191 | spin_lock_irqsave(&ec->lock, flags); |
| 1192 | while (ec->nr_pending_queries) { |
| 1193 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1194 | (void)acpi_ec_query(ec, NULL); |
| 1195 | spin_lock_irqsave(&ec->lock, flags); |
| 1196 | ec->nr_pending_queries--; |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 1197 | /* |
| 1198 | * Before exit, make sure that this work item can be |
| 1199 | * scheduled again. There might be QR_EC failures, leaving |
| 1200 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work |
| 1201 | * item from being scheduled again. |
| 1202 | */ |
| 1203 | if (!ec->nr_pending_queries) { |
| 1204 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 1205 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) |
| 1206 | acpi_ec_complete_query(ec); |
| 1207 | } |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1208 | } |
| 1209 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1210 | |
| 1211 | ec_dbg_evt("Event stopped"); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1212 | |
| 1213 | acpi_ec_check_event(ec); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 1214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
Lin Ming | 8b6cd8a | 2010-12-13 13:38:46 +0800 | [diff] [blame] | 1216 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
| 1217 | u32 gpe_number, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1219 | unsigned long flags; |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1220 | struct acpi_ec *ec = data; |
Lennart Poettering | 00eb43a | 2007-05-04 14:16:19 +0200 | [diff] [blame] | 1221 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1222 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 1223 | advance_transaction(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 1224 | spin_unlock_irqrestore(&ec->lock, flags); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 1225 | return ACPI_INTERRUPT_HANDLED; |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 1226 | } |
| 1227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1229 | * Address Space Management |
| 1230 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
| 1232 | static acpi_status |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1233 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1234 | u32 bits, u64 *value64, |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1235 | void *handler_context, void *region_context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | { |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1237 | struct acpi_ec *ec = handler_context; |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1238 | int result = 0, i, bytes = bits / 8; |
| 1239 | u8 *value = (u8 *)value64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | if ((address > 0xFF) || !value || !handler_context) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1242 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1244 | if (function != ACPI_READ && function != ACPI_WRITE) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1245 | return AE_BAD_PARAMETER; |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1246 | |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 1247 | if (ec_busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1248 | acpi_ec_burst_enable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1249 | |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1250 | for (i = 0; i < bytes; ++i, ++address, ++value) |
| 1251 | result = (function == ACPI_READ) ? |
| 1252 | acpi_ec_read(ec, address, value) : |
| 1253 | acpi_ec_write(ec, address, *value); |
Alexey Starikovskiy | 3e71a87 | 2008-01-11 02:42:51 +0300 | [diff] [blame] | 1254 | |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 1255 | if (ec_busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1256 | acpi_ec_burst_disable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | switch (result) { |
| 1259 | case -EINVAL: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1260 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | case -ENODEV: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1262 | return AE_NOT_FOUND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | case -ETIME: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1264 | return AE_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | default: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1266 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1271 | * Driver Interface |
| 1272 | * -------------------------------------------------------------------------- */ |
| 1273 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1274 | static acpi_status |
| 1275 | ec_parse_io_ports(struct acpi_resource *resource, void *context); |
| 1276 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1277 | static struct acpi_ec *make_acpi_ec(void) |
| 1278 | { |
| 1279 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1280 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1281 | if (!ec) |
| 1282 | return NULL; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1283 | mutex_init(&ec->mutex); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1284 | init_waitqueue_head(&ec->wait); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1285 | INIT_LIST_HEAD(&ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1286 | spin_lock_init(&ec->lock); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1287 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 1288 | ec->timestamp = jiffies; |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1289 | return ec; |
| 1290 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1292 | static acpi_status |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1293 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, |
| 1294 | void *context, void **return_value) |
| 1295 | { |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1296 | char node_name[5]; |
| 1297 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1298 | struct acpi_ec *ec = context; |
| 1299 | int value = 0; |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1300 | acpi_status status; |
| 1301 | |
| 1302 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
| 1303 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1304 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1305 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1306 | return AE_OK; |
| 1307 | } |
| 1308 | |
| 1309 | static acpi_status |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1310 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1311 | { |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1312 | acpi_status status; |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1313 | unsigned long long tmp = 0; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1314 | struct acpi_ec *ec = context; |
Alexey Starikovskiy | a5032bf | 2009-04-01 01:33:15 -0400 | [diff] [blame] | 1315 | |
| 1316 | /* clear addr values, ec_parse_io_ports depend on it */ |
| 1317 | ec->command_addr = ec->data_addr = 0; |
| 1318 | |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1319 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 1320 | ec_parse_io_ports, ec); |
| 1321 | if (ACPI_FAILURE(status)) |
| 1322 | return status; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1323 | |
| 1324 | /* Get GPE bit assignment (EC events). */ |
| 1325 | /* TODO: Add support for _GPE returning a package */ |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1326 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1327 | if (ACPI_FAILURE(status)) |
| 1328 | return status; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1329 | ec->gpe = tmp; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1330 | /* Use the global lock for all EC transactions? */ |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1331 | tmp = 0; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1332 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
| 1333 | ec->global_lock = tmp; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1334 | ec->handle = handle; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1335 | return AE_CTRL_TERMINATE; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1336 | } |
| 1337 | |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1338 | static int ec_install_handlers(struct acpi_ec *ec) |
| 1339 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1340 | acpi_status status; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1341 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1342 | acpi_ec_start(ec, false); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1343 | |
| 1344 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
| 1345 | status = acpi_install_address_space_handler(ec->handle, |
| 1346 | ACPI_ADR_SPACE_EC, |
| 1347 | &acpi_ec_space_handler, |
| 1348 | NULL, ec); |
| 1349 | if (ACPI_FAILURE(status)) { |
| 1350 | if (status == AE_NOT_FOUND) { |
| 1351 | /* |
| 1352 | * Maybe OS fails in evaluating the _REG |
| 1353 | * object. The AE_NOT_FOUND error will be |
| 1354 | * ignored and OS * continue to initialize |
| 1355 | * EC. |
| 1356 | */ |
| 1357 | pr_err("Fail in evaluating the _REG object" |
| 1358 | " of EC device. Broken bios is suspected.\n"); |
| 1359 | } else { |
| 1360 | acpi_ec_stop(ec, false); |
| 1361 | return -ENODEV; |
| 1362 | } |
| 1363 | } |
| 1364 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1365 | } |
| 1366 | |
| 1367 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1368 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
| 1369 | ACPI_GPE_EDGE_TRIGGERED, |
| 1370 | &acpi_ec_gpe_handler, ec); |
| 1371 | /* This is not fatal as we can poll EC events */ |
| 1372 | if (ACPI_SUCCESS(status)) { |
| 1373 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
| 1374 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 1375 | ec->reference_count >= 1) |
| 1376 | acpi_ec_enable_gpe(ec, true); |
Zhao Yakui | 20edd74 | 2008-10-17 02:02:44 -0400 | [diff] [blame] | 1377 | } |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1378 | } |
| 1379 | |
| 1380 | return 0; |
| 1381 | } |
| 1382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | static void ec_remove_handlers(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | { |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1385 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
| 1386 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
| 1387 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
| 1388 | pr_err("failed to remove space handler\n"); |
| 1389 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1390 | } |
| 1391 | |
Lv Zheng | fa5b4a5 | 2016-07-08 09:25:05 +0800 | [diff] [blame] | 1392 | /* |
| 1393 | * Stops handling the EC transactions after removing the operation |
| 1394 | * region handler. This is required because _REG(DISCONNECT) |
| 1395 | * invoked during the removal can result in new EC transactions. |
| 1396 | * |
| 1397 | * Flushes the EC requests and thus disables the GPE before |
| 1398 | * removing the GPE handler. This is required by the current ACPICA |
| 1399 | * GPE core. ACPICA GPE core will automatically disable a GPE when |
| 1400 | * it is indicated but there is no way to handle it. So the drivers |
| 1401 | * must disable the GPEs prior to removing the GPE handlers. |
| 1402 | */ |
| 1403 | acpi_ec_stop(ec, false); |
| 1404 | |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1405 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1406 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
| 1407 | &acpi_ec_gpe_handler))) |
| 1408 | pr_err("failed to remove gpe handler\n"); |
| 1409 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
| 1410 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1413 | static struct acpi_ec *acpi_ec_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1415 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | /* Check for boot EC */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1418 | if (boot_ec) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | ec = boot_ec; |
| 1420 | boot_ec = NULL; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1421 | ec_remove_handlers(ec); |
| 1422 | if (first_ec == ec) |
| 1423 | first_ec = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } else { |
| 1425 | ec = make_acpi_ec(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | } |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1427 | return ec; |
| 1428 | } |
| 1429 | |
| 1430 | static int acpi_ec_add(struct acpi_device *device) |
| 1431 | { |
| 1432 | struct acpi_ec *ec = NULL; |
| 1433 | int ret; |
| 1434 | |
| 1435 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| 1436 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| 1437 | |
| 1438 | ec = acpi_ec_alloc(); |
| 1439 | if (!ec) |
| 1440 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
| 1442 | AE_CTRL_TERMINATE) { |
| 1443 | kfree(ec); |
| 1444 | return -EINVAL; |
| 1445 | } |
| 1446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | /* Find and register all query methods */ |
| 1448 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 1449 | acpi_ec_register_query_methods, NULL, ec, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | |
| 1451 | if (!first_ec) |
| 1452 | first_ec = ec; |
| 1453 | device->driver_data = ec; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1454 | |
Andi Kleen | d6795fe3 | 2012-02-06 08:17:08 -0800 | [diff] [blame] | 1455 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
| 1456 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); |
| 1457 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); |
| 1458 | 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] | 1459 | |
Lan Tianyu | 16a26e8 | 2013-09-12 03:32:04 -0400 | [diff] [blame] | 1460 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | ec->gpe, ec->command_addr, ec->data_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
Alexey Starikovskiy | 4c61106 | 2007-09-05 19:56:38 -0400 | [diff] [blame] | 1463 | ret = ec_install_handlers(ec); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1464 | |
Lan Tianyu | 1c832b3 | 2015-04-01 09:47:18 +0800 | [diff] [blame] | 1465 | /* Reprobe devices depending on the EC */ |
| 1466 | acpi_walk_dep_device_list(ec->handle); |
| 1467 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1468 | /* EC is fully operational, allow queries */ |
Lv Zheng | 750f628 | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 1469 | acpi_ec_enable_event(ec); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1470 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | } |
| 1472 | |
Rafael J. Wysocki | 51fac83 | 2013-01-24 00:24:48 +0100 | [diff] [blame] | 1473 | static int acpi_ec_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1475 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1478 | return -EINVAL; |
Alexey Starikovskiy | f9319f9 | 2007-08-24 08:10:11 +0400 | [diff] [blame] | 1479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | ec = acpi_driver_data(device); |
Bjorn Helgaas | cf745ec | 2009-06-22 20:41:40 +0000 | [diff] [blame] | 1481 | ec_remove_handlers(ec); |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1482 | acpi_ec_remove_query_handlers(ec, true, 0); |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1483 | release_region(ec->data_addr, 1); |
| 1484 | release_region(ec->command_addr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | device->driver_data = NULL; |
| 1486 | if (ec == first_ec) |
| 1487 | first_ec = NULL; |
| 1488 | kfree(ec); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1489 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | } |
| 1491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | static acpi_status |
| 1493 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
| 1494 | { |
| 1495 | struct acpi_ec *ec = context; |
| 1496 | |
| 1497 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
| 1498 | return AE_OK; |
| 1499 | |
| 1500 | /* |
| 1501 | * The first address region returned is the data port, and |
| 1502 | * the second address region returned is the status/command |
| 1503 | * port. |
| 1504 | */ |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1505 | if (ec->data_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | ec->data_addr = resource->data.io.minimum; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1507 | else if (ec->command_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | ec->command_addr = resource->data.io.minimum; |
| 1509 | else |
| 1510 | return AE_CTRL_TERMINATE; |
| 1511 | |
| 1512 | return AE_OK; |
| 1513 | } |
| 1514 | |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1515 | static const struct acpi_device_id ec_device_ids[] = { |
| 1516 | {"PNP0C09", 0}, |
| 1517 | {"", 0}, |
| 1518 | }; |
| 1519 | |
| 1520 | int __init acpi_ec_dsdt_probe(void) |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1521 | { |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1522 | acpi_status status; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1523 | struct acpi_ec *ec; |
| 1524 | int ret; |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1525 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1526 | ec = acpi_ec_alloc(); |
| 1527 | if (!ec) |
| 1528 | return -ENOMEM; |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1529 | /* |
| 1530 | * Finding EC from DSDT if there is no ECDT EC available. When this |
| 1531 | * function is invoked, ACPI tables have been fully loaded, we can |
| 1532 | * walk namespace now. |
| 1533 | */ |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1534 | status = acpi_get_devices(ec_device_ids[0].id, |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1535 | ec_parse_device, ec, NULL); |
| 1536 | if (ACPI_FAILURE(status) || !ec->handle) { |
| 1537 | ret = -ENODEV; |
| 1538 | goto error; |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1539 | } |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1540 | ret = ec_install_handlers(ec); |
| 1541 | |
| 1542 | error: |
| 1543 | if (ret) |
| 1544 | kfree(ec); |
| 1545 | else |
| 1546 | first_ec = boot_ec = ec; |
| 1547 | return ret; |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1548 | } |
| 1549 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1550 | #if 0 |
Feng Tang | 67bfa9b | 2012-09-28 15:22:01 +0800 | [diff] [blame] | 1551 | /* |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1552 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
| 1553 | * set, for which case, we complete the QR_EC without issuing it to the |
| 1554 | * firmware. |
| 1555 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 |
| 1556 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1557 | */ |
| 1558 | static int ec_flag_query_handshake(const struct dmi_system_id *id) |
| 1559 | { |
| 1560 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); |
| 1561 | EC_FLAGS_QUERY_HANDSHAKE = 1; |
| 1562 | return 0; |
| 1563 | } |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1564 | #endif |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1565 | |
| 1566 | /* |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1567 | * On some hardware it is necessary to clear events accumulated by the EC during |
| 1568 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too |
| 1569 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) |
| 1570 | * |
| 1571 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 |
| 1572 | * |
| 1573 | * Ideally, the EC should also be instructed NOT to accumulate events during |
| 1574 | * sleep (which Windows seems to do somehow), but the interface to control this |
| 1575 | * behaviour is not known at this time. |
| 1576 | * |
| 1577 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, |
| 1578 | * however it is very likely that other Samsung models are affected. |
| 1579 | * |
| 1580 | * On systems which don't accumulate _Q events during sleep, this extra check |
| 1581 | * should be harmless. |
| 1582 | */ |
| 1583 | static int ec_clear_on_resume(const struct dmi_system_id *id) |
| 1584 | { |
| 1585 | pr_debug("Detected system needing EC poll on resume.\n"); |
| 1586 | EC_FLAGS_CLEAR_ON_RESUME = 1; |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1587 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1588 | return 0; |
| 1589 | } |
| 1590 | |
Lv Zheng | bc53956 | 2016-06-21 17:42:12 +0800 | [diff] [blame] | 1591 | /* |
| 1592 | * Some ECDTs contain wrong register addresses. |
| 1593 | * MSI MS-171F |
| 1594 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 |
| 1595 | */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1596 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
| 1597 | { |
| 1598 | pr_debug("Detected system needing ECDT address correction.\n"); |
| 1599 | EC_FLAGS_CORRECT_ECDT = 1; |
| 1600 | return 0; |
| 1601 | } |
| 1602 | |
Sachin Kamat | 6cef749 | 2013-08-07 17:16:55 +0530 | [diff] [blame] | 1603 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1604 | { |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1605 | ec_correct_ecdt, "MSI MS-171F", { |
Lv Zheng | 3174abc | 2015-05-15 14:37:11 +0800 | [diff] [blame] | 1606 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
| 1607 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, |
Lan Tianyu | 777cb38 | 2014-08-29 10:50:08 +0800 | [diff] [blame] | 1608 | { |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 1609 | ec_clear_on_resume, "Samsung hardware", { |
| 1610 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1611 | {}, |
| 1612 | }; |
| 1613 | |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1614 | int __init acpi_ec_ecdt_probe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1616 | int ret; |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1617 | acpi_status status; |
| 1618 | struct acpi_table_ecdt *ecdt_ptr; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1619 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1621 | ec = acpi_ec_alloc(); |
| 1622 | if (!ec) |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1623 | return -ENOMEM; |
| 1624 | /* |
| 1625 | * Generate a boot ec context |
| 1626 | */ |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1627 | dmi_check_system(ec_dmi_table); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1628 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 1629 | (struct acpi_table_header **)&ecdt_ptr); |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1630 | if (ACPI_FAILURE(status)) { |
| 1631 | ret = -ENODEV; |
| 1632 | goto error; |
| 1633 | } |
| 1634 | |
| 1635 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
| 1636 | /* |
| 1637 | * Asus X50GL: |
| 1638 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 |
| 1639 | */ |
| 1640 | ret = -ENODEV; |
| 1641 | goto error; |
| 1642 | } |
| 1643 | |
| 1644 | pr_info("EC description table is found, configuring boot EC\n"); |
| 1645 | if (EC_FLAGS_CORRECT_ECDT) { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1646 | ec->command_addr = ecdt_ptr->data.address; |
| 1647 | ec->data_addr = ecdt_ptr->control.address; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1648 | } else { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1649 | ec->command_addr = ecdt_ptr->control.address; |
| 1650 | ec->data_addr = ecdt_ptr->data.address; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1651 | } |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1652 | ec->gpe = ecdt_ptr->gpe; |
| 1653 | ec->handle = ACPI_ROOT_OBJECT; |
| 1654 | ret = ec_install_handlers(ec); |
Alexey Starikovskiy | c5279de | 2008-11-26 17:11:53 -0500 | [diff] [blame] | 1655 | error: |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1656 | if (ret) |
| 1657 | kfree(ec); |
| 1658 | else |
| 1659 | first_ec = boot_ec = ec; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1660 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | } |
| 1662 | |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1663 | #ifdef CONFIG_PM_SLEEP |
| 1664 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) |
| 1665 | { |
| 1666 | unsigned long flags; |
| 1667 | |
| 1668 | if (ec == first_ec) { |
| 1669 | spin_lock_irqsave(&ec->lock, flags); |
| 1670 | ec->saved_busy_polling = ec_busy_polling; |
| 1671 | ec->saved_polling_guard = ec_polling_guard; |
| 1672 | ec_busy_polling = true; |
| 1673 | ec_polling_guard = 0; |
| 1674 | ec_log_drv("interrupt blocked"); |
| 1675 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1676 | } |
| 1677 | } |
| 1678 | |
| 1679 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) |
| 1680 | { |
| 1681 | unsigned long flags; |
| 1682 | |
| 1683 | if (ec == first_ec) { |
| 1684 | spin_lock_irqsave(&ec->lock, flags); |
| 1685 | ec_busy_polling = ec->saved_busy_polling; |
| 1686 | ec_polling_guard = ec->saved_polling_guard; |
| 1687 | ec_log_drv("interrupt unblocked"); |
| 1688 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1689 | } |
| 1690 | } |
| 1691 | |
| 1692 | static int acpi_ec_suspend_noirq(struct device *dev) |
| 1693 | { |
| 1694 | struct acpi_ec *ec = |
| 1695 | acpi_driver_data(to_acpi_device(dev)); |
| 1696 | |
| 1697 | acpi_ec_enter_noirq(ec); |
| 1698 | return 0; |
| 1699 | } |
| 1700 | |
| 1701 | static int acpi_ec_resume_noirq(struct device *dev) |
| 1702 | { |
| 1703 | struct acpi_ec *ec = |
| 1704 | acpi_driver_data(to_acpi_device(dev)); |
| 1705 | |
| 1706 | acpi_ec_leave_noirq(ec); |
| 1707 | return 0; |
| 1708 | } |
| 1709 | #endif |
| 1710 | |
| 1711 | static const struct dev_pm_ops acpi_ec_pm = { |
| 1712 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) |
| 1713 | }; |
| 1714 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1715 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
| 1716 | { |
| 1717 | int result = 0; |
| 1718 | |
| 1719 | if (!strncmp(val, "status", sizeof("status") - 1)) { |
| 1720 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
| 1721 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); |
| 1722 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { |
| 1723 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; |
| 1724 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); |
| 1725 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { |
| 1726 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; |
| 1727 | pr_info("Assuming SCI_EVT clearing on event reads\n"); |
| 1728 | } else |
| 1729 | result = -EINVAL; |
| 1730 | return result; |
| 1731 | } |
| 1732 | |
| 1733 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) |
| 1734 | { |
| 1735 | switch (ec_event_clearing) { |
| 1736 | case ACPI_EC_EVT_TIMING_STATUS: |
| 1737 | return sprintf(buffer, "status"); |
| 1738 | case ACPI_EC_EVT_TIMING_QUERY: |
| 1739 | return sprintf(buffer, "query"); |
| 1740 | case ACPI_EC_EVT_TIMING_EVENT: |
| 1741 | return sprintf(buffer, "event"); |
| 1742 | default: |
| 1743 | return sprintf(buffer, "invalid"); |
| 1744 | } |
| 1745 | return 0; |
| 1746 | } |
| 1747 | |
| 1748 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, |
| 1749 | NULL, 0644); |
| 1750 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); |
| 1751 | |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1752 | static struct acpi_driver acpi_ec_driver = { |
| 1753 | .name = "ec", |
| 1754 | .class = ACPI_EC_CLASS, |
| 1755 | .ids = ec_device_ids, |
| 1756 | .ops = { |
| 1757 | .add = acpi_ec_add, |
| 1758 | .remove = acpi_ec_remove, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1759 | }, |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1760 | .drv.pm = &acpi_ec_pm, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 1761 | }; |
| 1762 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1763 | static inline int acpi_ec_query_init(void) |
| 1764 | { |
| 1765 | if (!ec_query_wq) { |
| 1766 | ec_query_wq = alloc_workqueue("kec_query", 0, |
| 1767 | ec_max_queries); |
| 1768 | if (!ec_query_wq) |
| 1769 | return -ENODEV; |
| 1770 | } |
| 1771 | return 0; |
| 1772 | } |
| 1773 | |
| 1774 | static inline void acpi_ec_query_exit(void) |
| 1775 | { |
| 1776 | if (ec_query_wq) { |
| 1777 | destroy_workqueue(ec_query_wq); |
| 1778 | ec_query_wq = NULL; |
| 1779 | } |
| 1780 | } |
| 1781 | |
Bjorn Helgaas | a5f820f | 2009-03-24 16:49:48 -0600 | [diff] [blame] | 1782 | int __init acpi_ec_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | { |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1784 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1786 | /* register workqueue for _Qxx evaluations */ |
| 1787 | result = acpi_ec_query_init(); |
| 1788 | if (result) |
| 1789 | goto err_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | /* Now register the driver for the EC */ |
| 1791 | result = acpi_bus_register_driver(&acpi_ec_driver); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1792 | if (result) |
| 1793 | goto err_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1795 | err_exit: |
| 1796 | if (result) |
| 1797 | acpi_ec_query_exit(); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1798 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | } |
| 1800 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | /* EC driver currently not unloadable */ |
| 1802 | #if 0 |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1803 | static void __exit acpi_ec_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | |
| 1806 | acpi_bus_unregister_driver(&acpi_ec_driver); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1807 | acpi_ec_query_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | } |
Alexey Starikovskiy | 7843932 | 2007-10-22 14:18:43 +0400 | [diff] [blame] | 1809 | #endif /* 0 */ |