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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>
37#include <linux/proc_fs.h>
38#include <linux/seq_file.h>
Dmitry Torokhov451566f2005-03-19 01:10:05 -050039#include <linux/interrupt.h>
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040040#include <linux/list.h>
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040041#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <asm/io.h>
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
Len Browneb27cae2009-07-06 23:40:19 -040045#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_EC_CLASS "embedded_controller"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_EC_DEVICE_NAME "Embedded Controller"
49#define ACPI_EC_FILE_INFO "info"
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040050
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +030051#define PREFIX "ACPI: EC: "
Alexey Starikovskiy43509332007-05-29 16:42:57 +040052
Denis M. Sadykov703959d2006-09-26 19:50:33 +040053/* EC status register */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
55#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
Dmitry Torokhov451566f2005-03-19 01:10:05 -050056#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
Alexey Starikovskiy43509332007-05-29 16:42:57 +040058
Denis M. Sadykov703959d2006-09-26 19:50:33 +040059/* EC commands */
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030060enum ec_command {
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +030061 ACPI_EC_COMMAND_READ = 0x80,
62 ACPI_EC_COMMAND_WRITE = 0x81,
63 ACPI_EC_BURST_ENABLE = 0x82,
64 ACPI_EC_BURST_DISABLE = 0x83,
65 ACPI_EC_COMMAND_QUERY = 0x84,
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030066};
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040067
Alexey Starikovskiy5c406412006-12-07 18:42:16 +030068#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040069#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
Alexey Starikovskiy34ff4db2009-04-01 00:25:10 -040070#define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +040071#define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040072
Alexey Starikovskiy06cf7d32008-11-09 19:01:06 +030073#define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040074 per one transaction */
75
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040076enum {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040077 EC_FLAGS_QUERY_PENDING, /* Query is pending */
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040078 EC_FLAGS_GPE_STORM, /* GPE storm detected */
79 EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
80 * OpReg are installed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040082
83/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Alexey Starikovskiyd0338792007-03-07 22:28:00 +030084/* External interfaces use first EC only, so remember */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040085typedef int (*acpi_ec_query_func) (void *data);
86
87struct acpi_ec_query_handler {
88 struct list_head node;
89 acpi_ec_query_func func;
90 acpi_handle handle;
91 void *data;
92 u8 query_bit;
93};
94
Alexey Starikovskiy84632002008-09-26 00:54:28 +040095struct transaction {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040096 const u8 *wdata;
97 u8 *rdata;
98 unsigned short irq_count;
Alexey Starikovskiy84632002008-09-26 00:54:28 +040099 u8 command;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300100 u8 wi;
101 u8 ri;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400102 u8 wlen;
103 u8 rlen;
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300104 bool done;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400105};
106
Adrian Bunka854e082006-12-19 12:56:12 -0800107static struct acpi_ec {
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400108 acpi_handle handle;
Alexey Starikovskiya86e2772006-12-07 18:42:16 +0300109 unsigned long gpe;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400110 unsigned long command_addr;
111 unsigned long data_addr;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400112 unsigned long global_lock;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400113 unsigned long flags;
Alexey Starikovskiyc787a852006-12-07 18:42:16 +0300114 struct mutex lock;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400115 wait_queue_head_t wait;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400116 struct list_head list;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400117 struct transaction *curr;
118 spinlock_t curr_lock;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300119} *boot_ec, *first_ec;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400120
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500121static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400122static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400123static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/* --------------------------------------------------------------------------
126 Transaction Management
127 -------------------------------------------------------------------------- */
128
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400129static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300131 u8 x = inb(ec->command_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500132 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300133 return x;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400136static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400137{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300138 u8 x = inb(ec->data_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500139 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400140 return x;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400141}
142
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400143static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400144{
Márton Németh86dae012008-01-23 22:33:06 -0500145 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400146 outb(command, ec->command_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400147}
148
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400149static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400150{
Márton Németh86dae012008-01-23 22:33:06 -0500151 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400152 outb(data, ec->data_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400153}
154
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400155static int ec_transaction_done(struct acpi_ec *ec)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400156{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400157 unsigned long flags;
158 int ret = 0;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400159 spin_lock_irqsave(&ec->curr_lock, flags);
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300160 if (!ec->curr || ec->curr->done)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400161 ret = 1;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400162 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400163 return ret;
164}
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400165
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300166static void start_transaction(struct acpi_ec *ec)
167{
168 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
169 ec->curr->done = false;
170 acpi_ec_write_cmd(ec, ec->curr->command);
171}
172
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400173static void advance_transaction(struct acpi_ec *ec, u8 status)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400174{
175 unsigned long flags;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400176 spin_lock_irqsave(&ec->curr_lock, flags);
177 if (!ec->curr)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400178 goto unlock;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300179 if (ec->curr->wlen > ec->curr->wi) {
180 if ((status & ACPI_EC_FLAG_IBF) == 0)
181 acpi_ec_write_data(ec,
182 ec->curr->wdata[ec->curr->wi++]);
183 else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300184 goto err;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300185 } else if (ec->curr->rlen > ec->curr->ri) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400186 if ((status & ACPI_EC_FLAG_OBF) == 1) {
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300187 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
188 if (ec->curr->rlen == ec->curr->ri)
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300189 ec->curr->done = true;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400190 } else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300191 goto err;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300192 } else if (ec->curr->wlen == ec->curr->wi &&
193 (status & ACPI_EC_FLAG_IBF) == 0)
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300194 ec->curr->done = true;
195 goto unlock;
196err:
197 /* false interrupt, state didn't change */
Alexey Starikovskiy7b4d4692008-11-13 12:00:03 +0300198 if (in_interrupt())
199 ++ec->curr->irq_count;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400200unlock:
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400201 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400202}
203
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300204static int acpi_ec_sync_query(struct acpi_ec *ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400205
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300206static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400207{
208 if (state & ACPI_EC_FLAG_SCI) {
209 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300210 return acpi_ec_sync_query(ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400211 }
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400212 return 0;
213}
214
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400215static int ec_poll(struct acpi_ec *ec)
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300216{
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400217 unsigned long flags;
218 int repeat = 2; /* number of command restarts */
219 while (repeat--) {
220 unsigned long delay = jiffies +
221 msecs_to_jiffies(ACPI_EC_DELAY);
222 do {
223 /* don't sleep with disabled interrupts */
224 if (EC_FLAGS_MSI || irqs_disabled()) {
225 udelay(ACPI_EC_MSI_UDELAY);
226 if (ec_transaction_done(ec))
227 return 0;
228 } else {
229 if (wait_event_timeout(ec->wait,
230 ec_transaction_done(ec),
231 msecs_to_jiffies(1)))
232 return 0;
233 }
234 advance_transaction(ec, acpi_ec_read_status(ec));
235 } while (time_before(jiffies, delay));
Alexey Starikovskiye12ac3d2009-10-02 02:53:15 +0400236 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400237 break;
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400238 pr_debug(PREFIX "controller reset, restart transaction\n");
239 spin_lock_irqsave(&ec->curr_lock, flags);
240 start_transaction(ec);
241 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300242 }
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300243 return -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500244}
245
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400246static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400247 struct transaction *t)
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400248{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400249 unsigned long tmp;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400250 int ret = 0;
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500251 if (EC_FLAGS_MSI)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400252 udelay(ACPI_EC_MSI_UDELAY);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400253 /* start transaction */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400254 spin_lock_irqsave(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400255 /* following two actions should be kept atomic */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400256 ec->curr = t;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300257 start_transaction(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400258 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400259 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400260 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400261 ret = ec_poll(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400262 spin_lock_irqsave(&ec->curr_lock, tmp);
263 ec->curr = NULL;
264 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400265 return ret;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400266}
267
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400268static int ec_check_ibf0(struct acpi_ec *ec)
269{
270 u8 status = acpi_ec_read_status(ec);
271 return (status & ACPI_EC_FLAG_IBF) == 0;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400272}
273
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400274static int ec_wait_ibf0(struct acpi_ec *ec)
275{
276 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
277 /* interrupt wait manually if GPE mode is not active */
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400278 while (time_before(jiffies, delay))
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400279 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
280 msecs_to_jiffies(1)))
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400281 return 0;
282 return -ETIME;
283}
284
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400285static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
Luming Yu45bea152005-07-23 04:08:00 -0400286{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400287 int status;
Len Brown50526df2005-08-11 17:32:05 -0400288 u32 glk;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400289 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
Patrick Mocheld550d982006-06-27 00:41:40 -0400290 return -EINVAL;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400291 if (t->rdata)
292 memset(t->rdata, 0, t->rlen);
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300293 mutex_lock(&ec->lock);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400294 if (ec->global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300296 if (ACPI_FAILURE(status)) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400297 status = -ENODEV;
298 goto unlock;
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400301 if (ec_wait_ibf0(ec)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300302 pr_err(PREFIX "input buffer is not empty, "
303 "aborting transaction\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400304 status = -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500305 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400306 }
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300307 pr_debug(PREFIX "transaction start\n");
308 /* disable GPE during transaction if storm is detected */
309 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Rafael J. Wysockicbbc0de2010-02-24 00:52:08 +0100310 /*
311 * It has to be disabled at the hardware level regardless of the
312 * GPE reference counting, so that it doesn't trigger.
313 */
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100314 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300315 }
316
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400317 status = acpi_ec_transaction_unlocked(ec, t);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300318
319 /* check if we received SCI during transaction */
320 ec_check_sci_sync(ec, acpi_ec_read_status(ec));
321 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300322 msleep(1);
Rafael J. Wysockicbbc0de2010-02-24 00:52:08 +0100323 /*
324 * It is safe to enable the GPE outside of the transaction. Use
325 * acpi_set_gpe() for that, since we used it to disable the GPE
326 * above.
327 */
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100328 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300329 } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
330 pr_info(PREFIX "GPE storm detected, "
331 "transactions will use polling mode\n");
332 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
333 }
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300334 pr_debug(PREFIX "transaction end\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400335end:
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400336 if (ec->global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 acpi_release_global_lock(glk);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400338unlock:
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300339 mutex_unlock(&ec->lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400340 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
342
Roel Kluin8a383ef2008-12-09 20:45:30 +0100343static int acpi_ec_burst_enable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300344{
345 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400346 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
347 .wdata = NULL, .rdata = &d,
348 .wlen = 0, .rlen = 1};
349
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400350 return acpi_ec_transaction(ec, &t);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300351}
352
Roel Kluin8a383ef2008-12-09 20:45:30 +0100353static int acpi_ec_burst_disable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300354{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400355 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
356 .wdata = NULL, .rdata = NULL,
357 .wlen = 0, .rlen = 0};
358
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400359 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400360 acpi_ec_transaction(ec, &t) : 0;
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300361}
362
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300363static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400364{
365 int result;
366 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400367 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
368 .wdata = &address, .rdata = &d,
369 .wlen = 1, .rlen = 1};
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400370
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400371 result = acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400372 *data = d;
373 return result;
374}
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400375
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400376static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
377{
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300378 u8 wdata[2] = { address, data };
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400379 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
380 .wdata = wdata, .rdata = NULL,
381 .wlen = 2, .rlen = 0};
382
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400383 return acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400384}
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386/*
387 * Externally callable EC access functions. For now, assume 1 EC only
388 */
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300389int ec_burst_enable(void)
390{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300391 if (!first_ec)
392 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300393 return acpi_ec_burst_enable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300394}
395
396EXPORT_SYMBOL(ec_burst_enable);
397
398int ec_burst_disable(void)
399{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300400 if (!first_ec)
401 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300402 return acpi_ec_burst_disable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300403}
404
405EXPORT_SYMBOL(ec_burst_disable);
406
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300407int ec_read(u8 addr, u8 * val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 int err;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400410 u8 temp_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 if (!first_ec)
413 return -ENODEV;
414
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300415 err = acpi_ec_read(first_ec, addr, &temp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
417 if (!err) {
418 *val = temp_data;
419 return 0;
Len Brown50526df2005-08-11 17:32:05 -0400420 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 return err;
422}
Len Brown50526df2005-08-11 17:32:05 -0400423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424EXPORT_SYMBOL(ec_read);
425
Len Brown50526df2005-08-11 17:32:05 -0400426int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 int err;
429
430 if (!first_ec)
431 return -ENODEV;
432
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300433 err = acpi_ec_write(first_ec, addr, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 return err;
436}
Len Brown50526df2005-08-11 17:32:05 -0400437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438EXPORT_SYMBOL(ec_write);
439
Randy Dunlap616362d2006-10-27 01:47:34 -0400440int ec_transaction(u8 command,
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500441 const u8 * wdata, unsigned wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200442 u8 * rdata, unsigned rdata_len,
443 int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400444{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400445 struct transaction t = {.command = command,
446 .wdata = wdata, .rdata = rdata,
447 .wlen = wdata_len, .rlen = rdata_len};
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400448 if (!first_ec)
449 return -ENODEV;
450
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400451 return acpi_ec_transaction(first_ec, &t);
Luming Yu45bea152005-07-23 04:08:00 -0400452}
Luming Yu45bea152005-07-23 04:08:00 -0400453
Lennart Poetteringab9e43c2006-10-03 22:49:00 -0400454EXPORT_SYMBOL(ec_transaction);
455
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300456static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400457{
458 int result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300459 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400460 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
461 .wdata = NULL, .rdata = &d,
462 .wlen = 0, .rlen = 1};
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300463 if (!ec || !data)
464 return -EINVAL;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300465 /*
466 * Query the EC to find out which _Qxx method we need to evaluate.
467 * Note that successful completion of the query causes the ACPI_EC_SCI
468 * bit to be cleared (and thus clearing the interrupt source).
469 */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300470 result = acpi_ec_transaction_unlocked(ec, &t);
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300471 if (result)
472 return result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300473 if (!d)
474 return -ENODATA;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300475 *data = d;
476 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479/* --------------------------------------------------------------------------
480 Event Management
481 -------------------------------------------------------------------------- */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400482int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
483 acpi_handle handle, acpi_ec_query_func func,
484 void *data)
485{
486 struct acpi_ec_query_handler *handler =
487 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
488 if (!handler)
489 return -ENOMEM;
490
491 handler->query_bit = query_bit;
492 handler->handle = handle;
493 handler->func = func;
494 handler->data = data;
495 mutex_lock(&ec->lock);
Alexey Starikovskiy30c08572007-09-26 19:43:22 +0400496 list_add(&handler->node, &ec->list);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400497 mutex_unlock(&ec->lock);
498 return 0;
499}
500
501EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
502
503void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
504{
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200505 struct acpi_ec_query_handler *handler, *tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400506 mutex_lock(&ec->lock);
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200507 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400508 if (query_bit == handler->query_bit) {
509 list_del(&handler->node);
510 kfree(handler);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400511 }
512 }
513 mutex_unlock(&ec->lock);
514}
515
516EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300518static void acpi_ec_run(void *cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300520 struct acpi_ec_query_handler *handler = cxt;
521 if (!handler)
Alexey Starikovskiye41334c2006-12-07 18:42:16 +0300522 return;
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300523 pr_debug(PREFIX "start query execution\n");
524 if (handler->func)
525 handler->func(handler->data);
526 else if (handler->handle)
527 acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
528 pr_debug(PREFIX "stop query execution\n");
529 kfree(handler);
530}
531
532static int acpi_ec_sync_query(struct acpi_ec *ec)
533{
534 u8 value = 0;
535 int status;
536 struct acpi_ec_query_handler *handler, *copy;
537 if ((status = acpi_ec_query_unlocked(ec, &value)))
538 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400539 list_for_each_entry(handler, &ec->list, node) {
540 if (value == handler->query_bit) {
541 /* have custom handler for this bit */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300542 copy = kmalloc(sizeof(*handler), GFP_KERNEL);
543 if (!copy)
544 return -ENOMEM;
545 memcpy(copy, handler, sizeof(*copy));
546 pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value);
Alexey Starikovskiyf5347862009-12-30 15:53:03 +0300547 return acpi_os_execute((copy->func) ?
548 OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300549 acpi_ec_run, copy);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400550 }
551 }
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300552 return 0;
553}
554
555static void acpi_ec_gpe_query(void *ec_cxt)
556{
557 struct acpi_ec *ec = ec_cxt;
558 if (!ec)
559 return;
560 mutex_lock(&ec->lock);
561 acpi_ec_sync_query(ec);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400562 mutex_unlock(&ec->lock);
Luming Yu45bea152005-07-23 04:08:00 -0400563}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300565static void acpi_ec_gpe_query(void *ec_cxt);
566
567static int ec_check_sci(struct acpi_ec *ec, u8 state)
568{
569 if (state & ACPI_EC_FLAG_SCI) {
570 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
571 pr_debug(PREFIX "push gpe query to the queue\n");
572 return acpi_os_execute(OSL_NOTIFY_HANDLER,
573 acpi_ec_gpe_query, ec);
574 }
575 }
576 return 0;
577}
578
Len Brown50526df2005-08-11 17:32:05 -0400579static u32 acpi_ec_gpe_handler(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300581 struct acpi_ec *ec = data;
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200582
Márton Németh3ebe08a2007-11-21 03:23:26 +0300583 pr_debug(PREFIX "~~~> interrupt\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400584
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300585 advance_transaction(ec, acpi_ec_read_status(ec));
586 if (ec_transaction_done(ec) &&
587 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400588 wake_up(&ec->wait);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300589 ec_check_sci(ec, acpi_ec_read_status(ec));
590 }
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400591 return ACPI_INTERRUPT_HANDLED;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300592}
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594/* --------------------------------------------------------------------------
595 Address Space Management
596 -------------------------------------------------------------------------- */
597
598static acpi_status
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400599acpi_ec_space_handler(u32 function, acpi_physical_address address,
Lin Ming439913f2010-01-28 10:53:19 +0800600 u32 bits, u64 *value,
Len Brown50526df2005-08-11 17:32:05 -0400601 void *handler_context, void *region_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300603 struct acpi_ec *ec = handler_context;
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300604 int result = 0, i;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400605 u8 temp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if ((address > 0xFF) || !value || !handler_context)
Patrick Mocheld550d982006-06-27 00:41:40 -0400608 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400610 if (function != ACPI_READ && function != ACPI_WRITE)
Patrick Mocheld550d982006-06-27 00:41:40 -0400611 return AE_BAD_PARAMETER;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400612
613 if (bits != 8 && acpi_strict)
614 return AE_BAD_PARAMETER;
615
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400616 if (EC_FLAGS_MSI)
617 acpi_ec_burst_enable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300618
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300619 if (function == ACPI_READ) {
620 result = acpi_ec_read(ec, address, &temp);
621 *value = temp;
622 } else {
623 temp = 0xff & (*value);
624 result = acpi_ec_write(ec, address, temp);
625 }
626
627 for (i = 8; unlikely(bits - i > 0); i += 8) {
628 ++address;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400629 if (function == ACPI_READ) {
630 result = acpi_ec_read(ec, address, &temp);
Lin Ming439913f2010-01-28 10:53:19 +0800631 (*value) |= ((u64)temp) << i;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400632 } else {
633 temp = 0xff & ((*value) >> i);
634 result = acpi_ec_write(ec, address, temp);
635 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
637
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400638 if (EC_FLAGS_MSI)
639 acpi_ec_burst_disable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 switch (result) {
642 case -EINVAL:
Patrick Mocheld550d982006-06-27 00:41:40 -0400643 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 break;
645 case -ENODEV:
Patrick Mocheld550d982006-06-27 00:41:40 -0400646 return AE_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 break;
648 case -ETIME:
Patrick Mocheld550d982006-06-27 00:41:40 -0400649 return AE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 break;
651 default:
Patrick Mocheld550d982006-06-27 00:41:40 -0400652 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656/* --------------------------------------------------------------------------
657 FS Interface (/proc)
658 -------------------------------------------------------------------------- */
659
Len Brown50526df2005-08-11 17:32:05 -0400660static struct proc_dir_entry *acpi_ec_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Len Brown50526df2005-08-11 17:32:05 -0400662static int acpi_ec_read_info(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300664 struct acpi_ec *ec = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (!ec)
667 goto end;
668
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300669 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
670 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
671 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
672 seq_printf(seq, "use global lock:\t%s\n",
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400673 ec->global_lock ? "yes" : "no");
Len Brown50526df2005-08-11 17:32:05 -0400674 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400675 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
678static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
679{
680 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
681}
682
Jan Engelhardt070d8eb2009-01-12 00:07:55 +0100683static const struct file_operations acpi_ec_info_ops = {
Len Brown50526df2005-08-11 17:32:05 -0400684 .open = acpi_ec_info_open_fs,
685 .read = seq_read,
686 .llseek = seq_lseek,
687 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 .owner = THIS_MODULE,
689};
690
Len Brown50526df2005-08-11 17:32:05 -0400691static int acpi_ec_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692{
Len Brown50526df2005-08-11 17:32:05 -0400693 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 if (!acpi_device_dir(device)) {
696 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown50526df2005-08-11 17:32:05 -0400697 acpi_ec_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400699 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 }
701
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700702 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
703 acpi_device_dir(device),
704 &acpi_ec_info_ops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400706 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400707 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708}
709
Len Brown50526df2005-08-11 17:32:05 -0400710static int acpi_ec_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (acpi_device_dir(device)) {
714 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
715 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
716 acpi_device_dir(device) = NULL;
717 }
718
Patrick Mocheld550d982006-06-27 00:41:40 -0400719 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720}
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722/* --------------------------------------------------------------------------
723 Driver Interface
724 -------------------------------------------------------------------------- */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300725static acpi_status
726ec_parse_io_ports(struct acpi_resource *resource, void *context);
727
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300728static struct acpi_ec *make_acpi_ec(void)
729{
730 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
731 if (!ec)
732 return NULL;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400733 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300734 mutex_init(&ec->lock);
735 init_waitqueue_head(&ec->wait);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400736 INIT_LIST_HEAD(&ec->list);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400737 spin_lock_init(&ec->curr_lock);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300738 return ec;
739}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400741static acpi_status
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400742acpi_ec_register_query_methods(acpi_handle handle, u32 level,
743 void *context, void **return_value)
744{
Lin Ming0175d562008-12-16 16:46:12 +0800745 char node_name[5];
746 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400747 struct acpi_ec *ec = context;
748 int value = 0;
Lin Ming0175d562008-12-16 16:46:12 +0800749 acpi_status status;
750
751 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
752
753 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400754 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
755 }
756 return AE_OK;
757}
758
759static acpi_status
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400760ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400761{
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400762 acpi_status status;
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500763 unsigned long long tmp = 0;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400764
765 struct acpi_ec *ec = context;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400766
767 /* clear addr values, ec_parse_io_ports depend on it */
768 ec->command_addr = ec->data_addr = 0;
769
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400770 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
771 ec_parse_io_ports, ec);
772 if (ACPI_FAILURE(status))
773 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400774
775 /* Get GPE bit assignment (EC events). */
776 /* TODO: Add support for _GPE returning a package */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400777 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400778 if (ACPI_FAILURE(status))
779 return status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400780 ec->gpe = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400781 /* Use the global lock for all EC transactions? */
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500782 tmp = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400783 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
784 ec->global_lock = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400785 ec->handle = handle;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400786 return AE_CTRL_TERMINATE;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400787}
788
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300789static int ec_install_handlers(struct acpi_ec *ec)
790{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300791 acpi_status status;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400792 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400793 return 0;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300794 status = acpi_install_gpe_handler(NULL, ec->gpe,
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400795 ACPI_GPE_EDGE_TRIGGERED,
796 &acpi_ec_gpe_handler, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300797 if (ACPI_FAILURE(status))
798 return -ENODEV;
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100799
800 acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300801 status = acpi_install_address_space_handler(ec->handle,
802 ACPI_ADR_SPACE_EC,
803 &acpi_ec_space_handler,
Alexey Starikovskiy6d9e1122008-03-24 23:22:29 +0300804 NULL, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300805 if (ACPI_FAILURE(status)) {
Zhao Yakui20edd742008-10-17 02:02:44 -0400806 if (status == AE_NOT_FOUND) {
807 /*
808 * Maybe OS fails in evaluating the _REG object.
809 * The AE_NOT_FOUND error will be ignored and OS
810 * continue to initialize EC.
811 */
812 printk(KERN_ERR "Fail in evaluating the _REG object"
813 " of EC device. Broken bios is suspected.\n");
814 } else {
815 acpi_remove_gpe_handler(NULL, ec->gpe,
816 &acpi_ec_gpe_handler);
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100817 acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
Zhao Yakui20edd742008-10-17 02:02:44 -0400818 return -ENODEV;
819 }
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300820 }
821
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400822 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300823 return 0;
824}
825
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826static void ec_remove_handlers(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100828 acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
830 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
831 pr_err(PREFIX "failed to remove space handler\n");
832 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
833 &acpi_ec_gpe_handler)))
834 pr_err(PREFIX "failed to remove gpe handler\n");
835 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
836}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838static int acpi_ec_add(struct acpi_device *device)
839{
840 struct acpi_ec *ec = NULL;
Bjorn Helgaasd02be042009-06-22 20:41:35 +0000841 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
844 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 /* Check for boot EC */
847 if (boot_ec &&
848 (boot_ec->handle == device->handle ||
849 boot_ec->handle == ACPI_ROOT_OBJECT)) {
850 ec = boot_ec;
851 boot_ec = NULL;
852 } else {
853 ec = make_acpi_ec();
854 if (!ec)
855 return -ENOMEM;
856 }
857 if (ec_parse_device(device->handle, 0, ec, NULL) !=
858 AE_CTRL_TERMINATE) {
859 kfree(ec);
860 return -EINVAL;
861 }
862
863 ec->handle = device->handle;
864
865 /* Find and register all query methods */
866 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
Lin Ming22635762009-11-13 10:06:08 +0800867 acpi_ec_register_query_methods, NULL, ec, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 if (!first_ec)
870 first_ec = ec;
871 device->driver_data = ec;
872 acpi_ec_add_fs(device);
873 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
874 ec->gpe, ec->command_addr, ec->data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400876 ret = ec_install_handlers(ec);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300877
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400878 /* EC is fully operational, allow queries */
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400879 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400880 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881}
882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883static int acpi_ec_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300885 struct acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 struct acpi_ec_query_handler *handler, *tmp;
887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400889 return -EINVAL;
Alexey Starikovskiyf9319f92007-08-24 08:10:11 +0400890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 ec = acpi_driver_data(device);
Bjorn Helgaascf745ec2009-06-22 20:41:40 +0000892 ec_remove_handlers(ec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 mutex_lock(&ec->lock);
894 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
895 list_del(&handler->node);
896 kfree(handler);
897 }
898 mutex_unlock(&ec->lock);
899 acpi_ec_remove_fs(device);
900 device->driver_data = NULL;
901 if (ec == first_ec)
902 first_ec = NULL;
903 kfree(ec);
Patrick Mocheld550d982006-06-27 00:41:40 -0400904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907static acpi_status
908ec_parse_io_ports(struct acpi_resource *resource, void *context)
909{
910 struct acpi_ec *ec = context;
911
912 if (resource->type != ACPI_RESOURCE_TYPE_IO)
913 return AE_OK;
914
915 /*
916 * The first address region returned is the data port, and
917 * the second address region returned is the status/command
918 * port.
919 */
920 if (ec->data_addr == 0)
921 ec->data_addr = resource->data.io.minimum;
922 else if (ec->command_addr == 0)
923 ec->command_addr = resource->data.io.minimum;
924 else
925 return AE_CTRL_TERMINATE;
926
927 return AE_OK;
928}
929
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500930int __init acpi_boot_ec_enable(void)
931{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400932 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500933 return 0;
934 if (!ec_install_handlers(boot_ec)) {
935 first_ec = boot_ec;
936 return 0;
937 }
938 return -EFAULT;
939}
940
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300941static const struct acpi_device_id ec_device_ids[] = {
942 {"PNP0C09", 0},
943 {"", 0},
944};
945
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400946/* Some BIOS do not survive early DSDT scan, skip it */
947static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
948{
949 EC_FLAGS_SKIP_DSDT_SCAN = 1;
950 return 0;
951}
952
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400953/* ASUStek often supplies us with broken ECDT, validate it */
954static int ec_validate_ecdt(const struct dmi_system_id *id)
955{
956 EC_FLAGS_VALIDATE_ECDT = 1;
957 return 0;
958}
959
960/* MSI EC needs special treatment, enable it */
961static int ec_flag_msi(const struct dmi_system_id *id)
962{
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500963 printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n");
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400964 EC_FLAGS_MSI = 1;
965 EC_FLAGS_VALIDATE_ECDT = 1;
966 return 0;
967}
968
969static struct dmi_system_id __initdata ec_dmi_table[] = {
970 {
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400971 ec_skip_dsdt_scan, "Compal JFL92", {
972 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
973 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
974 {
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400975 ec_flag_msi, "MSI hardware", {
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500976 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
977 {
978 ec_flag_msi, "MSI hardware", {
979 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
980 {
981 ec_flag_msi, "MSI hardware", {
982 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400983 {
984 ec_validate_ecdt, "ASUS hardware", {
985 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
986 {},
987};
988
989
Len Brown50526df2005-08-11 17:32:05 -0400990int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300992 acpi_status status;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300993 struct acpi_ec *saved_ec = NULL;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300994 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300996 boot_ec = make_acpi_ec();
997 if (!boot_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300998 return -ENOMEM;
999 /*
1000 * Generate a boot ec context
1001 */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +04001002 dmi_check_system(ec_dmi_table);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +03001003 status = acpi_get_table(ACPI_SIG_ECDT, 1,
1004 (struct acpi_table_header **)&ecdt_ptr);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -04001005 if (ACPI_SUCCESS(status)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +03001006 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -04001007 boot_ec->command_addr = ecdt_ptr->control.address;
1008 boot_ec->data_addr = ecdt_ptr->data.address;
1009 boot_ec->gpe = ecdt_ptr->gpe;
Len Brown4af8e102008-03-11 00:27:16 -04001010 boot_ec->handle = ACPI_ROOT_OBJECT;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +03001011 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001012 /* Don't trust ECDT, which comes from ASUSTek */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +04001013 if (!EC_FLAGS_VALIDATE_ECDT)
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001014 goto install;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001015 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1016 if (!saved_ec)
1017 return -ENOMEM;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -04001018 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
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 int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1068{
1069 struct acpi_ec *ec = acpi_driver_data(device);
Rafael J. Wysockicbbc0de2010-02-24 00:52:08 +01001070 /* Stop using the GPE, but keep it reference counted. */
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +01001071 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001072 return 0;
1073}
1074
1075static int acpi_ec_resume(struct acpi_device *device)
1076{
1077 struct acpi_ec *ec = acpi_driver_data(device);
Rafael J. Wysockicbbc0de2010-02-24 00:52:08 +01001078 /* Enable the GPE again, but don't reference count it once more. */
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +01001079 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001080 return 0;
1081}
1082
1083static struct acpi_driver acpi_ec_driver = {
1084 .name = "ec",
1085 .class = ACPI_EC_CLASS,
1086 .ids = ec_device_ids,
1087 .ops = {
1088 .add = acpi_ec_add,
1089 .remove = acpi_ec_remove,
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001090 .suspend = acpi_ec_suspend,
1091 .resume = acpi_ec_resume,
1092 },
1093};
1094
Bjorn Helgaasa5f820f2009-03-24 16:49:48 -06001095int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096{
Len Brown50526df2005-08-11 17:32:05 -04001097 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1100 if (!acpi_ec_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -04001101 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 /* Now register the driver for the EC */
1104 result = acpi_bus_register_driver(&acpi_ec_driver);
1105 if (result < 0) {
1106 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -04001107 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 }
1109
Patrick Mocheld550d982006-06-27 00:41:40 -04001110 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111}
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113/* EC driver currently not unloadable */
1114#if 0
Len Brown50526df2005-08-11 17:32:05 -04001115static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
1118 acpi_bus_unregister_driver(&acpi_ec_driver);
1119
1120 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1121
Patrick Mocheld550d982006-06-27 00:41:40 -04001122 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123}
Alexey Starikovskiy78439322007-10-22 14:18:43 +04001124#endif /* 0 */