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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +04002 * ec.c - ACPI Embedded Controller Driver (v2.1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +04004 * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
Alexey Starikovskiy01f22462007-03-07 22:28:00 +03005 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040029/* Uncomment next line to get verbose printout */
Márton Némethd772b3b2008-01-23 22:34:09 -050030/* #define DEBUG */
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#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 Torokhov451566f2005-03-19 01:10:05 -050037#include <linux/interrupt.h>
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040038#include <linux/list.h>
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040039#include <linux/spinlock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/io.h>
42#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
Len Browneb27cae2009-07-06 23:40:19 -040044#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Thomas Renninger1195a092010-07-16 13:11:31 +020046#include "internal.h"
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_EC_CLASS "embedded_controller"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define ACPI_EC_DEVICE_NAME "Embedded Controller"
50#define ACPI_EC_FILE_INFO "info"
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040051
Thomas Renninger1195a092010-07-16 13:11:31 +020052#undef PREFIX
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +030053#define PREFIX "ACPI: EC: "
Alexey Starikovskiy43509332007-05-29 16:42:57 +040054
Denis M. Sadykov703959d2006-09-26 19:50:33 +040055/* EC status register */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
57#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
Dmitry Torokhov451566f2005-03-19 01:10:05 -050058#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
Alexey Starikovskiy43509332007-05-29 16:42:57 +040060
Denis M. Sadykov703959d2006-09-26 19:50:33 +040061/* EC commands */
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030062enum ec_command {
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +030063 ACPI_EC_COMMAND_READ = 0x80,
64 ACPI_EC_COMMAND_WRITE = 0x81,
65 ACPI_EC_BURST_ENABLE = 0x82,
66 ACPI_EC_BURST_DISABLE = 0x83,
67 ACPI_EC_COMMAND_QUERY = 0x84,
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030068};
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040069
Alexey Starikovskiy5c406412006-12-07 18:42:16 +030070#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040071#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +040072#define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040073
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040074enum {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040075 EC_FLAGS_QUERY_PENDING, /* Query is pending */
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040076 EC_FLAGS_GPE_STORM, /* GPE storm detected */
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +010077 EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040078 * OpReg are installed */
Rafael J. Wysockife955682010-04-09 01:40:38 +020079 EC_FLAGS_BLOCKED, /* Transactions are blocked */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040081
Thomas Renninger7a18e962010-10-21 18:24:57 +020082/* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */
83static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;
84module_param(ec_delay, uint, 0644);
85MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
86
Feng Tanga520d522012-09-28 15:22:00 +080087/*
88 * If the number of false interrupts per one transaction exceeds
89 * this threshold, will think there is a GPE storm happened and
90 * will disable the GPE for normal transaction.
91 */
92static unsigned int ec_storm_threshold __read_mostly = 8;
93module_param(ec_storm_threshold, uint, 0644);
94MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm");
95
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040096/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Alexey Starikovskiyd0338792007-03-07 22:28:00 +030097/* External interfaces use first EC only, so remember */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040098typedef int (*acpi_ec_query_func) (void *data);
99
100struct acpi_ec_query_handler {
101 struct list_head node;
102 acpi_ec_query_func func;
103 acpi_handle handle;
104 void *data;
105 u8 query_bit;
106};
107
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400108struct transaction {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400109 const u8 *wdata;
110 u8 *rdata;
111 unsigned short irq_count;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400112 u8 command;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300113 u8 wi;
114 u8 ri;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400115 u8 wlen;
116 u8 rlen;
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300117 bool done;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400118};
119
Thomas Renninger1195a092010-07-16 13:11:31 +0200120struct acpi_ec *boot_ec, *first_ec;
121EXPORT_SYMBOL(first_ec);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400122
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500123static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400124static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400125static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127/* --------------------------------------------------------------------------
128 Transaction Management
129 -------------------------------------------------------------------------- */
130
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400131static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300133 u8 x = inb(ec->command_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500134 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300135 return x;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400138static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400139{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300140 u8 x = inb(ec->data_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500141 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400142 return x;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400143}
144
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400145static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400146{
Márton Németh86dae012008-01-23 22:33:06 -0500147 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400148 outb(command, ec->command_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400149}
150
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400151static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400152{
Márton Németh86dae012008-01-23 22:33:06 -0500153 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400154 outb(data, ec->data_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400155}
156
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400157static int ec_transaction_done(struct acpi_ec *ec)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400158{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400159 unsigned long flags;
160 int ret = 0;
Feng Tangf351d022012-10-23 01:29:27 +0200161 spin_lock_irqsave(&ec->lock, flags);
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300162 if (!ec->curr || ec->curr->done)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400163 ret = 1;
Feng Tangf351d022012-10-23 01:29:27 +0200164 spin_unlock_irqrestore(&ec->lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400165 return ret;
166}
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400167
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300168static void start_transaction(struct acpi_ec *ec)
169{
170 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
171 ec->curr->done = false;
172 acpi_ec_write_cmd(ec, ec->curr->command);
173}
174
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400175static void advance_transaction(struct acpi_ec *ec, u8 status)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400176{
177 unsigned long flags;
Feng Tangb76b51b2012-10-23 01:29:38 +0200178 struct transaction *t = ec->curr;
179
Feng Tangf351d022012-10-23 01:29:27 +0200180 spin_lock_irqsave(&ec->lock, flags);
Feng Tangb76b51b2012-10-23 01:29:38 +0200181 if (!t)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400182 goto unlock;
Feng Tangb76b51b2012-10-23 01:29:38 +0200183 if (t->wlen > t->wi) {
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300184 if ((status & ACPI_EC_FLAG_IBF) == 0)
185 acpi_ec_write_data(ec,
Feng Tangb76b51b2012-10-23 01:29:38 +0200186 t->wdata[t->wi++]);
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300187 else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300188 goto err;
Feng Tangb76b51b2012-10-23 01:29:38 +0200189 } else if (t->rlen > t->ri) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400190 if ((status & ACPI_EC_FLAG_OBF) == 1) {
Feng Tangb76b51b2012-10-23 01:29:38 +0200191 t->rdata[t->ri++] = acpi_ec_read_data(ec);
192 if (t->rlen == t->ri)
193 t->done = true;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400194 } else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300195 goto err;
Feng Tangb76b51b2012-10-23 01:29:38 +0200196 } else if (t->wlen == t->wi &&
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300197 (status & ACPI_EC_FLAG_IBF) == 0)
Feng Tangb76b51b2012-10-23 01:29:38 +0200198 t->done = true;
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300199 goto unlock;
200err:
Feng Tanga3cd8d22012-10-23 01:30:12 +0200201 /*
202 * If SCI bit is set, then don't think it's a false IRQ
203 * otherwise will take a not handled IRQ as a false one.
204 */
205 if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI))
Feng Tangb76b51b2012-10-23 01:29:38 +0200206 ++t->irq_count;
Feng Tanga3cd8d22012-10-23 01:30:12 +0200207
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400208unlock:
Feng Tangf351d022012-10-23 01:29:27 +0200209 spin_unlock_irqrestore(&ec->lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400210}
211
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300212static int acpi_ec_sync_query(struct acpi_ec *ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400213
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300214static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400215{
216 if (state & ACPI_EC_FLAG_SCI) {
217 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300218 return acpi_ec_sync_query(ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400219 }
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400220 return 0;
221}
222
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400223static int ec_poll(struct acpi_ec *ec)
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300224{
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400225 unsigned long flags;
226 int repeat = 2; /* number of command restarts */
227 while (repeat--) {
228 unsigned long delay = jiffies +
Thomas Renninger7a18e962010-10-21 18:24:57 +0200229 msecs_to_jiffies(ec_delay);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400230 do {
231 /* don't sleep with disabled interrupts */
232 if (EC_FLAGS_MSI || irqs_disabled()) {
233 udelay(ACPI_EC_MSI_UDELAY);
234 if (ec_transaction_done(ec))
235 return 0;
236 } else {
237 if (wait_event_timeout(ec->wait,
238 ec_transaction_done(ec),
239 msecs_to_jiffies(1)))
240 return 0;
241 }
242 advance_transaction(ec, acpi_ec_read_status(ec));
243 } while (time_before(jiffies, delay));
Alexey Starikovskiye12ac3d2009-10-02 02:53:15 +0400244 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400245 break;
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400246 pr_debug(PREFIX "controller reset, restart transaction\n");
Feng Tangf351d022012-10-23 01:29:27 +0200247 spin_lock_irqsave(&ec->lock, flags);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400248 start_transaction(ec);
Feng Tangf351d022012-10-23 01:29:27 +0200249 spin_unlock_irqrestore(&ec->lock, flags);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300250 }
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300251 return -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500252}
253
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400254static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400255 struct transaction *t)
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400256{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400257 unsigned long tmp;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400258 int ret = 0;
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500259 if (EC_FLAGS_MSI)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400260 udelay(ACPI_EC_MSI_UDELAY);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400261 /* start transaction */
Feng Tangf351d022012-10-23 01:29:27 +0200262 spin_lock_irqsave(&ec->lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400263 /* following two actions should be kept atomic */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400264 ec->curr = t;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300265 start_transaction(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400266 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400267 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Feng Tangf351d022012-10-23 01:29:27 +0200268 spin_unlock_irqrestore(&ec->lock, tmp);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400269 ret = ec_poll(ec);
Feng Tangf351d022012-10-23 01:29:27 +0200270 spin_lock_irqsave(&ec->lock, tmp);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400271 ec->curr = NULL;
Feng Tangf351d022012-10-23 01:29:27 +0200272 spin_unlock_irqrestore(&ec->lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400273 return ret;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400274}
275
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400276static int ec_check_ibf0(struct acpi_ec *ec)
277{
278 u8 status = acpi_ec_read_status(ec);
279 return (status & ACPI_EC_FLAG_IBF) == 0;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400280}
281
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400282static int ec_wait_ibf0(struct acpi_ec *ec)
283{
Thomas Renninger7a18e962010-10-21 18:24:57 +0200284 unsigned long delay = jiffies + msecs_to_jiffies(ec_delay);
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400285 /* interrupt wait manually if GPE mode is not active */
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400286 while (time_before(jiffies, delay))
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400287 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
288 msecs_to_jiffies(1)))
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400289 return 0;
290 return -ETIME;
291}
292
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400293static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
Luming Yu45bea152005-07-23 04:08:00 -0400294{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400295 int status;
Len Brown50526df2005-08-11 17:32:05 -0400296 u32 glk;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400297 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
Patrick Mocheld550d982006-06-27 00:41:40 -0400298 return -EINVAL;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400299 if (t->rdata)
300 memset(t->rdata, 0, t->rlen);
Feng Tangf351d022012-10-23 01:29:27 +0200301 mutex_lock(&ec->mutex);
Rafael J. Wysockife955682010-04-09 01:40:38 +0200302 if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) {
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100303 status = -EINVAL;
304 goto unlock;
305 }
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400306 if (ec->global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300308 if (ACPI_FAILURE(status)) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400309 status = -ENODEV;
310 goto unlock;
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400313 if (ec_wait_ibf0(ec)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300314 pr_err(PREFIX "input buffer is not empty, "
315 "aborting transaction\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400316 status = -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500317 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400318 }
Feng Tangb76b51b2012-10-23 01:29:38 +0200319 pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n",
320 t->command, t->wdata ? t->wdata[0] : 0);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300321 /* disable GPE during transaction if storm is detected */
322 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Rafael J. Wysocki37847302010-06-25 01:21:42 +0200323 /* It has to be disabled, so that it doesn't trigger. */
324 acpi_disable_gpe(NULL, ec->gpe);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300325 }
326
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400327 status = acpi_ec_transaction_unlocked(ec, t);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300328
329 /* check if we received SCI during transaction */
330 ec_check_sci_sync(ec, acpi_ec_read_status(ec));
331 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300332 msleep(1);
Rafael J. Wysocki37847302010-06-25 01:21:42 +0200333 /* It is safe to enable the GPE outside of the transaction. */
334 acpi_enable_gpe(NULL, ec->gpe);
Feng Tanga520d522012-09-28 15:22:00 +0800335 } else if (t->irq_count > ec_storm_threshold) {
Feng Tangb76b51b2012-10-23 01:29:38 +0200336 pr_info(PREFIX "GPE storm detected(%d GPEs), "
337 "transactions will use polling mode\n",
338 t->irq_count);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300339 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
340 }
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300341 pr_debug(PREFIX "transaction end\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400342end:
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400343 if (ec->global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 acpi_release_global_lock(glk);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400345unlock:
Feng Tangf351d022012-10-23 01:29:27 +0200346 mutex_unlock(&ec->mutex);
Patrick Mocheld550d982006-06-27 00:41:40 -0400347 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
Roel Kluin8a383ef2008-12-09 20:45:30 +0100350static int acpi_ec_burst_enable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300351{
352 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400353 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
354 .wdata = NULL, .rdata = &d,
355 .wlen = 0, .rlen = 1};
356
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400357 return acpi_ec_transaction(ec, &t);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300358}
359
Roel Kluin8a383ef2008-12-09 20:45:30 +0100360static int acpi_ec_burst_disable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300361{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400362 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
363 .wdata = NULL, .rdata = NULL,
364 .wlen = 0, .rlen = 0};
365
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400366 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400367 acpi_ec_transaction(ec, &t) : 0;
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300368}
369
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300370static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400371{
372 int result;
373 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400374 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
375 .wdata = &address, .rdata = &d,
376 .wlen = 1, .rlen = 1};
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400377
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400378 result = acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400379 *data = d;
380 return result;
381}
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400382
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400383static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
384{
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300385 u8 wdata[2] = { address, data };
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400386 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
387 .wdata = wdata, .rdata = NULL,
388 .wlen = 2, .rlen = 0};
389
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400390 return acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400391}
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393/*
394 * Externally callable EC access functions. For now, assume 1 EC only
395 */
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300396int ec_burst_enable(void)
397{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300398 if (!first_ec)
399 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300400 return acpi_ec_burst_enable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300401}
402
403EXPORT_SYMBOL(ec_burst_enable);
404
405int ec_burst_disable(void)
406{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300407 if (!first_ec)
408 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300409 return acpi_ec_burst_disable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300410}
411
412EXPORT_SYMBOL(ec_burst_disable);
413
Feng Tangb76b51b2012-10-23 01:29:38 +0200414int ec_read(u8 addr, u8 *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 int err;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400417 u8 temp_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 if (!first_ec)
420 return -ENODEV;
421
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300422 err = acpi_ec_read(first_ec, addr, &temp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 if (!err) {
425 *val = temp_data;
426 return 0;
Len Brown50526df2005-08-11 17:32:05 -0400427 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 return err;
429}
Len Brown50526df2005-08-11 17:32:05 -0400430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431EXPORT_SYMBOL(ec_read);
432
Len Brown50526df2005-08-11 17:32:05 -0400433int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 int err;
436
437 if (!first_ec)
438 return -ENODEV;
439
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300440 err = acpi_ec_write(first_ec, addr, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 return err;
443}
Len Brown50526df2005-08-11 17:32:05 -0400444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445EXPORT_SYMBOL(ec_write);
446
Randy Dunlap616362d2006-10-27 01:47:34 -0400447int ec_transaction(u8 command,
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500448 const u8 * wdata, unsigned wdata_len,
Thomas Renninger1cb7b1e2011-03-31 13:36:38 +0200449 u8 * rdata, unsigned rdata_len)
Luming Yu45bea152005-07-23 04:08:00 -0400450{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400451 struct transaction t = {.command = command,
452 .wdata = wdata, .rdata = rdata,
453 .wlen = wdata_len, .rlen = rdata_len};
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400454 if (!first_ec)
455 return -ENODEV;
456
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400457 return acpi_ec_transaction(first_ec, &t);
Luming Yu45bea152005-07-23 04:08:00 -0400458}
Luming Yu45bea152005-07-23 04:08:00 -0400459
Lennart Poetteringab9e43c2006-10-03 22:49:00 -0400460EXPORT_SYMBOL(ec_transaction);
461
Seth Forshee3e2abc52012-01-18 13:44:08 -0600462/* Get the handle to the EC device */
463acpi_handle ec_get_handle(void)
464{
465 if (!first_ec)
466 return NULL;
467 return first_ec->handle;
468}
469
470EXPORT_SYMBOL(ec_get_handle);
471
Rafael J. Wysockife955682010-04-09 01:40:38 +0200472void acpi_ec_block_transactions(void)
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100473{
474 struct acpi_ec *ec = first_ec;
475
476 if (!ec)
477 return;
478
Feng Tangf351d022012-10-23 01:29:27 +0200479 mutex_lock(&ec->mutex);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100480 /* Prevent transactions from being carried out */
Rafael J. Wysockife955682010-04-09 01:40:38 +0200481 set_bit(EC_FLAGS_BLOCKED, &ec->flags);
Feng Tangf351d022012-10-23 01:29:27 +0200482 mutex_unlock(&ec->mutex);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100483}
484
Rafael J. Wysockife955682010-04-09 01:40:38 +0200485void acpi_ec_unblock_transactions(void)
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100486{
487 struct acpi_ec *ec = first_ec;
488
489 if (!ec)
490 return;
491
Feng Tangf351d022012-10-23 01:29:27 +0200492 mutex_lock(&ec->mutex);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100493 /* Allow transactions to be carried out again */
Rafael J. Wysockife955682010-04-09 01:40:38 +0200494 clear_bit(EC_FLAGS_BLOCKED, &ec->flags);
Feng Tangf351d022012-10-23 01:29:27 +0200495 mutex_unlock(&ec->mutex);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100496}
497
Rafael J. Wysockife955682010-04-09 01:40:38 +0200498void acpi_ec_unblock_transactions_early(void)
Rafael J. Wysockid5a64512010-04-09 01:39:40 +0200499{
500 /*
501 * Allow transactions to happen again (this function is called from
502 * atomic context during wakeup, so we don't need to acquire the mutex).
503 */
504 if (first_ec)
Rafael J. Wysockife955682010-04-09 01:40:38 +0200505 clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags);
Rafael J. Wysockid5a64512010-04-09 01:39:40 +0200506}
507
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300508static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400509{
510 int result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300511 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400512 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
513 .wdata = NULL, .rdata = &d,
514 .wlen = 0, .rlen = 1};
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300515 if (!ec || !data)
516 return -EINVAL;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300517 /*
518 * Query the EC to find out which _Qxx method we need to evaluate.
519 * Note that successful completion of the query causes the ACPI_EC_SCI
520 * bit to be cleared (and thus clearing the interrupt source).
521 */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300522 result = acpi_ec_transaction_unlocked(ec, &t);
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300523 if (result)
524 return result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300525 if (!d)
526 return -ENODATA;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300527 *data = d;
528 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531/* --------------------------------------------------------------------------
532 Event Management
533 -------------------------------------------------------------------------- */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400534int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
535 acpi_handle handle, acpi_ec_query_func func,
536 void *data)
537{
538 struct acpi_ec_query_handler *handler =
539 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
540 if (!handler)
541 return -ENOMEM;
542
543 handler->query_bit = query_bit;
544 handler->handle = handle;
545 handler->func = func;
546 handler->data = data;
Feng Tangf351d022012-10-23 01:29:27 +0200547 mutex_lock(&ec->mutex);
Alexey Starikovskiy30c08572007-09-26 19:43:22 +0400548 list_add(&handler->node, &ec->list);
Feng Tangf351d022012-10-23 01:29:27 +0200549 mutex_unlock(&ec->mutex);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400550 return 0;
551}
552
553EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
554
555void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
556{
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200557 struct acpi_ec_query_handler *handler, *tmp;
Feng Tangf351d022012-10-23 01:29:27 +0200558 mutex_lock(&ec->mutex);
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200559 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400560 if (query_bit == handler->query_bit) {
561 list_del(&handler->node);
562 kfree(handler);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400563 }
564 }
Feng Tangf351d022012-10-23 01:29:27 +0200565 mutex_unlock(&ec->mutex);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400566}
567
568EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300570static void acpi_ec_run(void *cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300572 struct acpi_ec_query_handler *handler = cxt;
573 if (!handler)
Alexey Starikovskiye41334c2006-12-07 18:42:16 +0300574 return;
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300575 pr_debug(PREFIX "start query execution\n");
576 if (handler->func)
577 handler->func(handler->data);
578 else if (handler->handle)
579 acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
580 pr_debug(PREFIX "stop query execution\n");
581 kfree(handler);
582}
583
584static int acpi_ec_sync_query(struct acpi_ec *ec)
585{
586 u8 value = 0;
587 int status;
588 struct acpi_ec_query_handler *handler, *copy;
589 if ((status = acpi_ec_query_unlocked(ec, &value)))
590 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400591 list_for_each_entry(handler, &ec->list, node) {
592 if (value == handler->query_bit) {
593 /* have custom handler for this bit */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300594 copy = kmalloc(sizeof(*handler), GFP_KERNEL);
595 if (!copy)
596 return -ENOMEM;
597 memcpy(copy, handler, sizeof(*copy));
598 pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value);
Alexey Starikovskiyf5347862009-12-30 15:53:03 +0300599 return acpi_os_execute((copy->func) ?
600 OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300601 acpi_ec_run, copy);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400602 }
603 }
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300604 return 0;
605}
606
607static void acpi_ec_gpe_query(void *ec_cxt)
608{
609 struct acpi_ec *ec = ec_cxt;
610 if (!ec)
611 return;
Feng Tangf351d022012-10-23 01:29:27 +0200612 mutex_lock(&ec->mutex);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300613 acpi_ec_sync_query(ec);
Feng Tangf351d022012-10-23 01:29:27 +0200614 mutex_unlock(&ec->mutex);
Luming Yu45bea152005-07-23 04:08:00 -0400615}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300617static int ec_check_sci(struct acpi_ec *ec, u8 state)
618{
619 if (state & ACPI_EC_FLAG_SCI) {
620 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
621 pr_debug(PREFIX "push gpe query to the queue\n");
622 return acpi_os_execute(OSL_NOTIFY_HANDLER,
623 acpi_ec_gpe_query, ec);
624 }
625 }
626 return 0;
627}
628
Lin Ming8b6cd8a2010-12-13 13:38:46 +0800629static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
630 u32 gpe_number, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300632 struct acpi_ec *ec = data;
Feng Tangb76b51b2012-10-23 01:29:38 +0200633 u8 status = acpi_ec_read_status(ec);
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200634
Feng Tangb76b51b2012-10-23 01:29:38 +0200635 pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400636
Feng Tangb76b51b2012-10-23 01:29:38 +0200637 advance_transaction(ec, status);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300638 if (ec_transaction_done(ec) &&
639 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400640 wake_up(&ec->wait);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300641 ec_check_sci(ec, acpi_ec_read_status(ec));
642 }
Lin Mingbba63a22010-12-13 13:39:17 +0800643 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300644}
645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646/* --------------------------------------------------------------------------
647 Address Space Management
648 -------------------------------------------------------------------------- */
649
650static acpi_status
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400651acpi_ec_space_handler(u32 function, acpi_physical_address address,
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400652 u32 bits, u64 *value64,
Len Brown50526df2005-08-11 17:32:05 -0400653 void *handler_context, void *region_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300655 struct acpi_ec *ec = handler_context;
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400656 int result = 0, i, bytes = bits / 8;
657 u8 *value = (u8 *)value64;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 if ((address > 0xFF) || !value || !handler_context)
Patrick Mocheld550d982006-06-27 00:41:40 -0400660 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400662 if (function != ACPI_READ && function != ACPI_WRITE)
Patrick Mocheld550d982006-06-27 00:41:40 -0400663 return AE_BAD_PARAMETER;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400664
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400665 if (EC_FLAGS_MSI || bits > 8)
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400666 acpi_ec_burst_enable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300667
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400668 for (i = 0; i < bytes; ++i, ++address, ++value)
669 result = (function == ACPI_READ) ?
670 acpi_ec_read(ec, address, value) :
671 acpi_ec_write(ec, address, *value);
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300672
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400673 if (EC_FLAGS_MSI || bits > 8)
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400674 acpi_ec_burst_disable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 switch (result) {
677 case -EINVAL:
Patrick Mocheld550d982006-06-27 00:41:40 -0400678 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 break;
680 case -ENODEV:
Patrick Mocheld550d982006-06-27 00:41:40 -0400681 return AE_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 break;
683 case -ETIME:
Patrick Mocheld550d982006-06-27 00:41:40 -0400684 return AE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 break;
686 default:
Patrick Mocheld550d982006-06-27 00:41:40 -0400687 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689}
690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 Driver Interface
693 -------------------------------------------------------------------------- */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300694static acpi_status
695ec_parse_io_ports(struct acpi_resource *resource, void *context);
696
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300697static struct acpi_ec *make_acpi_ec(void)
698{
699 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
700 if (!ec)
701 return NULL;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400702 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
Feng Tangf351d022012-10-23 01:29:27 +0200703 mutex_init(&ec->mutex);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300704 init_waitqueue_head(&ec->wait);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400705 INIT_LIST_HEAD(&ec->list);
Feng Tangf351d022012-10-23 01:29:27 +0200706 spin_lock_init(&ec->lock);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300707 return ec;
708}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400710static acpi_status
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400711acpi_ec_register_query_methods(acpi_handle handle, u32 level,
712 void *context, void **return_value)
713{
Lin Ming0175d562008-12-16 16:46:12 +0800714 char node_name[5];
715 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400716 struct acpi_ec *ec = context;
717 int value = 0;
Lin Ming0175d562008-12-16 16:46:12 +0800718 acpi_status status;
719
720 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
721
722 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400723 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
724 }
725 return AE_OK;
726}
727
728static acpi_status
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400729ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400730{
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400731 acpi_status status;
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500732 unsigned long long tmp = 0;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400733
734 struct acpi_ec *ec = context;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400735
736 /* clear addr values, ec_parse_io_ports depend on it */
737 ec->command_addr = ec->data_addr = 0;
738
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400739 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
740 ec_parse_io_ports, ec);
741 if (ACPI_FAILURE(status))
742 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400743
744 /* Get GPE bit assignment (EC events). */
745 /* TODO: Add support for _GPE returning a package */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400746 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400747 if (ACPI_FAILURE(status))
748 return status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400749 ec->gpe = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400750 /* Use the global lock for all EC transactions? */
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500751 tmp = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400752 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
753 ec->global_lock = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400754 ec->handle = handle;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400755 return AE_CTRL_TERMINATE;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400756}
757
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300758static int ec_install_handlers(struct acpi_ec *ec)
759{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300760 acpi_status status;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400761 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400762 return 0;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300763 status = acpi_install_gpe_handler(NULL, ec->gpe,
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400764 ACPI_GPE_EDGE_TRIGGERED,
765 &acpi_ec_gpe_handler, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300766 if (ACPI_FAILURE(status))
767 return -ENODEV;
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100768
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800769 acpi_enable_gpe(NULL, ec->gpe);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300770 status = acpi_install_address_space_handler(ec->handle,
771 ACPI_ADR_SPACE_EC,
772 &acpi_ec_space_handler,
Alexey Starikovskiy6d9e1122008-03-24 23:22:29 +0300773 NULL, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300774 if (ACPI_FAILURE(status)) {
Zhao Yakui20edd742008-10-17 02:02:44 -0400775 if (status == AE_NOT_FOUND) {
776 /*
777 * Maybe OS fails in evaluating the _REG object.
778 * The AE_NOT_FOUND error will be ignored and OS
779 * continue to initialize EC.
780 */
781 printk(KERN_ERR "Fail in evaluating the _REG object"
782 " of EC device. Broken bios is suspected.\n");
783 } else {
784 acpi_remove_gpe_handler(NULL, ec->gpe,
785 &acpi_ec_gpe_handler);
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800786 acpi_disable_gpe(NULL, ec->gpe);
Zhao Yakui20edd742008-10-17 02:02:44 -0400787 return -ENODEV;
788 }
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300789 }
790
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400791 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300792 return 0;
793}
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795static void ec_remove_handlers(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800797 acpi_disable_gpe(NULL, ec->gpe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
799 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
800 pr_err(PREFIX "failed to remove space handler\n");
801 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
802 &acpi_ec_gpe_handler)))
803 pr_err(PREFIX "failed to remove gpe handler\n");
804 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
805}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807static int acpi_ec_add(struct acpi_device *device)
808{
809 struct acpi_ec *ec = NULL;
Bjorn Helgaasd02be042009-06-22 20:41:35 +0000810 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
813 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 /* Check for boot EC */
816 if (boot_ec &&
817 (boot_ec->handle == device->handle ||
818 boot_ec->handle == ACPI_ROOT_OBJECT)) {
819 ec = boot_ec;
820 boot_ec = NULL;
821 } else {
822 ec = make_acpi_ec();
823 if (!ec)
824 return -ENOMEM;
825 }
826 if (ec_parse_device(device->handle, 0, ec, NULL) !=
827 AE_CTRL_TERMINATE) {
828 kfree(ec);
829 return -EINVAL;
830 }
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 /* Find and register all query methods */
833 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
Lin Ming22635762009-11-13 10:06:08 +0800834 acpi_ec_register_query_methods, NULL, ec, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836 if (!first_ec)
837 first_ec = ec;
838 device->driver_data = ec;
Thomas Renningerde4f1042010-07-29 22:08:44 +0200839
Andi Kleend6795fe32012-02-06 08:17:08 -0800840 ret = !!request_region(ec->data_addr, 1, "EC data");
841 WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr);
842 ret = !!request_region(ec->command_addr, 1, "EC cmd");
843 WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
Thomas Renningerde4f1042010-07-29 22:08:44 +0200844
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
846 ec->gpe, ec->command_addr, ec->data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400848 ret = ec_install_handlers(ec);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300849
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400850 /* EC is fully operational, allow queries */
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400851 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400852 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853}
854
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100855static int acpi_ec_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300857 struct acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 struct acpi_ec_query_handler *handler, *tmp;
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400861 return -EINVAL;
Alexey Starikovskiyf9319f92007-08-24 08:10:11 +0400862
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 ec = acpi_driver_data(device);
Bjorn Helgaascf745ec2009-06-22 20:41:40 +0000864 ec_remove_handlers(ec);
Feng Tangf351d022012-10-23 01:29:27 +0200865 mutex_lock(&ec->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
867 list_del(&handler->node);
868 kfree(handler);
869 }
Feng Tangf351d022012-10-23 01:29:27 +0200870 mutex_unlock(&ec->mutex);
Thomas Renningerde4f1042010-07-29 22:08:44 +0200871 release_region(ec->data_addr, 1);
872 release_region(ec->command_addr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 device->driver_data = NULL;
874 if (ec == first_ec)
875 first_ec = NULL;
876 kfree(ec);
Patrick Mocheld550d982006-06-27 00:41:40 -0400877 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880static acpi_status
881ec_parse_io_ports(struct acpi_resource *resource, void *context)
882{
883 struct acpi_ec *ec = context;
884
885 if (resource->type != ACPI_RESOURCE_TYPE_IO)
886 return AE_OK;
887
888 /*
889 * The first address region returned is the data port, and
890 * the second address region returned is the status/command
891 * port.
892 */
Thomas Renningerde4f1042010-07-29 22:08:44 +0200893 if (ec->data_addr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 ec->data_addr = resource->data.io.minimum;
Thomas Renningerde4f1042010-07-29 22:08:44 +0200895 else if (ec->command_addr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 ec->command_addr = resource->data.io.minimum;
897 else
898 return AE_CTRL_TERMINATE;
899
900 return AE_OK;
901}
902
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500903int __init acpi_boot_ec_enable(void)
904{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400905 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500906 return 0;
907 if (!ec_install_handlers(boot_ec)) {
908 first_ec = boot_ec;
909 return 0;
910 }
911 return -EFAULT;
912}
913
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300914static const struct acpi_device_id ec_device_ids[] = {
915 {"PNP0C09", 0},
916 {"", 0},
917};
918
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400919/* Some BIOS do not survive early DSDT scan, skip it */
920static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
921{
922 EC_FLAGS_SKIP_DSDT_SCAN = 1;
923 return 0;
924}
925
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400926/* ASUStek often supplies us with broken ECDT, validate it */
927static int ec_validate_ecdt(const struct dmi_system_id *id)
928{
929 EC_FLAGS_VALIDATE_ECDT = 1;
930 return 0;
931}
932
933/* MSI EC needs special treatment, enable it */
934static int ec_flag_msi(const struct dmi_system_id *id)
935{
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500936 printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n");
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400937 EC_FLAGS_MSI = 1;
938 EC_FLAGS_VALIDATE_ECDT = 1;
939 return 0;
940}
941
Feng Tang67bfa9b2012-09-28 15:22:01 +0800942/*
943 * Clevo M720 notebook actually works ok with IRQ mode, if we lifted
944 * the GPE storm threshold back to 20
945 */
946static int ec_enlarge_storm_threshold(const struct dmi_system_id *id)
947{
948 pr_debug("Setting the EC GPE storm threshold to 20\n");
949 ec_storm_threshold = 20;
950 return 0;
951}
952
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400953static struct dmi_system_id __initdata ec_dmi_table[] = {
954 {
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400955 ec_skip_dsdt_scan, "Compal JFL92", {
956 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
957 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
958 {
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400959 ec_flag_msi, "MSI hardware", {
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500960 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
961 {
962 ec_flag_msi, "MSI hardware", {
963 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
964 {
965 ec_flag_msi, "MSI hardware", {
966 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400967 {
Alexey Starikovskiya5dc4f82010-12-09 17:07:54 -0500968 ec_flag_msi, "MSI hardware", {
969 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL},
970 {
Zhang Rui534bc4e2011-04-26 16:30:02 +0800971 ec_flag_msi, "Quanta hardware", {
972 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
973 DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL},
974 {
975 ec_flag_msi, "Quanta hardware", {
976 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
977 DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL},
978 {
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400979 ec_validate_ecdt, "ASUS hardware", {
980 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
Peter Collingbourneaf986d12011-04-24 22:09:32 +0100981 {
982 ec_validate_ecdt, "ASUS hardware", {
983 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL},
Feng Tang67bfa9b2012-09-28 15:22:01 +0800984 {
985 ec_enlarge_storm_threshold, "CLEVO hardware", {
986 DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
987 DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL},
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400988 {},
989};
990
Len Brown50526df2005-08-11 17:32:05 -0400991int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300993 acpi_status status;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300994 struct acpi_ec *saved_ec = NULL;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300995 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300997 boot_ec = make_acpi_ec();
998 if (!boot_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300999 return -ENOMEM;
1000 /*
1001 * Generate a boot ec context
1002 */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +04001003 dmi_check_system(ec_dmi_table);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +03001004 status = acpi_get_table(ACPI_SIG_ECDT, 1,
1005 (struct acpi_table_header **)&ecdt_ptr);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -04001006 if (ACPI_SUCCESS(status)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +03001007 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -04001008 boot_ec->command_addr = ecdt_ptr->control.address;
1009 boot_ec->data_addr = ecdt_ptr->data.address;
1010 boot_ec->gpe = ecdt_ptr->gpe;
Len Brown4af8e102008-03-11 00:27:16 -04001011 boot_ec->handle = ACPI_ROOT_OBJECT;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +03001012 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001013 /* Don't trust ECDT, which comes from ASUSTek */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +04001014 if (!EC_FLAGS_VALIDATE_ECDT)
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001015 goto install;
Julia Lawalld6bd5352010-05-15 23:16:21 +02001016 saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001017 if (!saved_ec)
1018 return -ENOMEM;
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001019 /* fall through */
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -04001020 }
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +04001021
Alexey Starikovskiy478fa032009-10-02 20:21:40 +04001022 if (EC_FLAGS_SKIP_DSDT_SCAN)
1023 return -ENODEV;
1024
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001025 /* This workaround is needed only on some broken machines,
1026 * which require early EC, but fail to provide ECDT */
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001027 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
1028 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1029 boot_ec, NULL);
1030 /* Check that acpi_get_devices actually find something */
1031 if (ACPI_FAILURE(status) || !boot_ec->handle)
1032 goto error;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001033 if (saved_ec) {
1034 /* try to find good ECDT from ASUSTek */
1035 if (saved_ec->command_addr != boot_ec->command_addr ||
1036 saved_ec->data_addr != boot_ec->data_addr ||
1037 saved_ec->gpe != boot_ec->gpe ||
1038 saved_ec->handle != boot_ec->handle)
1039 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
1040 "ECDT tables, which are very hard to workaround. "
1041 "Trying to use DSDT EC info instead. Please send "
1042 "output of acpidump to linux-acpi@vger.kernel.org\n");
1043 kfree(saved_ec);
1044 saved_ec = NULL;
1045 } else {
1046 /* We really need to limit this workaround, the only ASUS,
1047 * which needs it, has fake EC._INI method, so use it as flag.
1048 * Keep boot_ec struct as it will be needed soon.
1049 */
1050 acpi_handle dummy;
1051 if (!dmi_name_in_vendors("ASUS") ||
1052 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1053 &dummy)))
1054 return -ENODEV;
1055 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001056install:
1057 if (!ec_install_handlers(boot_ec)) {
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001058 first_ec = boot_ec;
Alexey Starikovskiye8284322007-03-07 22:28:00 +03001059 return 0;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001060 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001061error:
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +03001062 kfree(boot_ec);
1063 boot_ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return -ENODEV;
1065}
1066
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001067static struct acpi_driver acpi_ec_driver = {
1068 .name = "ec",
1069 .class = ACPI_EC_CLASS,
1070 .ids = ec_device_ids,
1071 .ops = {
1072 .add = acpi_ec_add,
1073 .remove = acpi_ec_remove,
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001074 },
1075};
1076
Bjorn Helgaasa5f820f2009-03-24 16:49:48 -06001077int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078{
Len Brown50526df2005-08-11 17:32:05 -04001079 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 /* Now register the driver for the EC */
1082 result = acpi_bus_register_driver(&acpi_ec_driver);
Thomas Renninger49c6c5f2010-07-16 13:11:34 +02001083 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -04001084 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085
Patrick Mocheld550d982006-06-27 00:41:40 -04001086 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087}
1088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089/* EC driver currently not unloadable */
1090#if 0
Len Brown50526df2005-08-11 17:32:05 -04001091static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094 acpi_bus_unregister_driver(&acpi_ec_driver);
Patrick Mocheld550d982006-06-27 00:41:40 -04001095 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096}
Alexey Starikovskiy78439322007-10-22 14:18:43 +04001097#endif /* 0 */