blob: 1feedcea2d40909434eeb91c4215ccff89abfda2 [file] [log] [blame]
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define ACPI_EC_CLASS "embedded_controller"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_EC_DEVICE_NAME "Embedded Controller"
48#define ACPI_EC_FILE_INFO "info"
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040049
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +030050#undef PREFIX
51#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 */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040071
Alexey Starikovskiy06cf7d32008-11-09 19:01:06 +030072#define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040073 per one transaction */
74
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040075enum {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040076 EC_FLAGS_QUERY_PENDING, /* Query is pending */
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040077 EC_FLAGS_GPE_MODE, /* Expect GPE to be sent
78 * for status change */
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +030079 EC_FLAGS_NO_GPE, /* Don't use GPE mode */
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040080 EC_FLAGS_GPE_STORM, /* GPE storm detected */
81 EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
82 * OpReg are installed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040084
85/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Alexey Starikovskiyd0338792007-03-07 22:28:00 +030086/* External interfaces use first EC only, so remember */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040087typedef int (*acpi_ec_query_func) (void *data);
88
89struct acpi_ec_query_handler {
90 struct list_head node;
91 acpi_ec_query_func func;
92 acpi_handle handle;
93 void *data;
94 u8 query_bit;
95};
96
Alexey Starikovskiy84632002008-09-26 00:54:28 +040097struct transaction {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040098 const u8 *wdata;
99 u8 *rdata;
100 unsigned short irq_count;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400101 u8 command;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300102 u8 wi;
103 u8 ri;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400104 u8 wlen;
105 u8 rlen;
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300106 bool done;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400107};
108
Adrian Bunka854e082006-12-19 12:56:12 -0800109static struct acpi_ec {
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400110 acpi_handle handle;
Alexey Starikovskiya86e2772006-12-07 18:42:16 +0300111 unsigned long gpe;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400112 unsigned long command_addr;
113 unsigned long data_addr;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400114 unsigned long global_lock;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400115 unsigned long flags;
Alexey Starikovskiyc787a852006-12-07 18:42:16 +0300116 struct mutex lock;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400117 wait_queue_head_t wait;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400118 struct list_head list;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400119 struct transaction *curr;
120 spinlock_t curr_lock;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300121} *boot_ec, *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 */
124
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 Starikovskiy7c6db4e2008-09-25 21:00:31 +0400173static void gpe_transaction(struct acpi_ec *ec, u8 status)
174{
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
204static int acpi_ec_wait(struct acpi_ec *ec)
205{
206 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
207 msecs_to_jiffies(ACPI_EC_DELAY)))
208 return 0;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300209 /* try restart command if we get any false interrupts */
210 if (ec->curr->irq_count &&
211 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
212 pr_debug(PREFIX "controller reset, restart transaction\n");
213 start_transaction(ec);
214 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
215 msecs_to_jiffies(ACPI_EC_DELAY)))
216 return 0;
217 }
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400218 /* missing GPEs, switch back to poll mode */
219 if (printk_ratelimit())
220 pr_info(PREFIX "missing confirmations, "
221 "switch off interrupt mode.\n");
222 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
223 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
224 return 1;
225}
226
227static void acpi_ec_gpe_query(void *ec_cxt);
228
229static int ec_check_sci(struct acpi_ec *ec, u8 state)
230{
231 if (state & ACPI_EC_FLAG_SCI) {
232 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
233 return acpi_os_execute(OSL_EC_BURST_HANDLER,
234 acpi_ec_gpe_query, ec);
235 }
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400236 return 0;
237}
238
Alexey Starikovskiy34ff4db2009-04-01 00:25:10 -0400239static void ec_delay(void)
240{
241 /* EC in MSI notebooks don't tolerate delays other than 550 usec */
242 if (EC_FLAGS_MSI)
243 udelay(ACPI_EC_DELAY);
244 else
245 /* Use shortest sleep available */
246 msleep(1);
247}
248
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400249static int ec_poll(struct acpi_ec *ec)
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300250{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400251 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
Alexey Starikovskiy34ff4db2009-04-01 00:25:10 -0400252 udelay(ACPI_EC_CDELAY);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400253 while (time_before(jiffies, delay)) {
254 gpe_transaction(ec, acpi_ec_read_status(ec));
Alexey Starikovskiy34ff4db2009-04-01 00:25:10 -0400255 ec_delay();
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400256 if (ec_transaction_done(ec))
Zhao Yakui9d699ed2008-08-11 10:33:31 +0800257 return 0;
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300258 }
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300259 return -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500260}
261
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400262static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
263 struct transaction *t,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200264 int force_poll)
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400265{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400266 unsigned long tmp;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400267 int ret = 0;
Márton Németh3ebe08a2007-11-21 03:23:26 +0300268 pr_debug(PREFIX "transaction start\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400269 /* disable GPE during transaction if storm is detected */
270 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
271 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
Alexey Starikovskiy0b7084a2008-10-25 21:48:46 +0400272 acpi_disable_gpe(NULL, ec->gpe);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400273 }
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500274 if (EC_FLAGS_MSI)
275 udelay(ACPI_EC_DELAY);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400276 /* start transaction */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400277 spin_lock_irqsave(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400278 /* following two actions should be kept atomic */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400279 ec->curr = t;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300280 start_transaction(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400281 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400282 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400283 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400284 /* if we selected poll mode or failed in GPE-mode do a poll loop */
285 if (force_poll ||
286 !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
287 acpi_ec_wait(ec))
288 ret = ec_poll(ec);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300289 pr_debug(PREFIX "transaction end\n");
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400290 spin_lock_irqsave(&ec->curr_lock, tmp);
291 ec->curr = NULL;
292 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400293 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
294 /* check if we received SCI during transaction */
295 ec_check_sci(ec, acpi_ec_read_status(ec));
296 /* it is safe to enable GPE outside of transaction */
Alexey Starikovskiy0b7084a2008-10-25 21:48:46 +0400297 acpi_enable_gpe(NULL, ec->gpe);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400298 } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400299 t->irq_count > ACPI_EC_STORM_THRESHOLD) {
Alan Jenkinsf8248432008-11-01 11:05:26 +0000300 pr_info(PREFIX "GPE storm detected, "
301 "transactions will use polling mode\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400302 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
303 }
304 return ret;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400305}
306
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400307static int ec_check_ibf0(struct acpi_ec *ec)
308{
309 u8 status = acpi_ec_read_status(ec);
310 return (status & ACPI_EC_FLAG_IBF) == 0;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400311}
312
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400313static int ec_wait_ibf0(struct acpi_ec *ec)
314{
315 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
316 /* interrupt wait manually if GPE mode is not active */
317 unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ?
318 msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1);
319 while (time_before(jiffies, delay))
320 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout))
321 return 0;
322 return -ETIME;
323}
324
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400325static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200326 int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400327{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400328 int status;
Len Brown50526df2005-08-11 17:32:05 -0400329 u32 glk;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400330 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
Patrick Mocheld550d982006-06-27 00:41:40 -0400331 return -EINVAL;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400332 if (t->rdata)
333 memset(t->rdata, 0, t->rlen);
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300334 mutex_lock(&ec->lock);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400335 if (ec->global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300337 if (ACPI_FAILURE(status)) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400338 status = -ENODEV;
339 goto unlock;
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300340 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400342 if (ec_wait_ibf0(ec)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300343 pr_err(PREFIX "input buffer is not empty, "
344 "aborting transaction\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400345 status = -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500346 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400347 }
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400348 status = acpi_ec_transaction_unlocked(ec, t, force_poll);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400349end:
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400350 if (ec->global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 acpi_release_global_lock(glk);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400352unlock:
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300353 mutex_unlock(&ec->lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400354 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
356
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300357/*
358 * Note: samsung nv5000 doesn't work with ec burst mode.
359 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
360 */
Roel Kluin8a383ef2008-12-09 20:45:30 +0100361static int acpi_ec_burst_enable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300362{
363 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400364 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
365 .wdata = NULL, .rdata = &d,
366 .wlen = 0, .rlen = 1};
367
368 return acpi_ec_transaction(ec, &t, 0);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300369}
370
Roel Kluin8a383ef2008-12-09 20:45:30 +0100371static int acpi_ec_burst_disable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300372{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400373 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
374 .wdata = NULL, .rdata = NULL,
375 .wlen = 0, .rlen = 0};
376
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400377 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400378 acpi_ec_transaction(ec, &t, 0) : 0;
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300379}
380
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300381static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400382{
383 int result;
384 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400385 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
386 .wdata = &address, .rdata = &d,
387 .wlen = 1, .rlen = 1};
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400388
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400389 result = acpi_ec_transaction(ec, &t, 0);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400390 *data = d;
391 return result;
392}
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400393
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400394static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
395{
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300396 u8 wdata[2] = { address, data };
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400397 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
398 .wdata = wdata, .rdata = NULL,
399 .wlen = 2, .rlen = 0};
400
401 return acpi_ec_transaction(ec, &t, 0);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400402}
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404/*
405 * Externally callable EC access functions. For now, assume 1 EC only
406 */
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300407int ec_burst_enable(void)
408{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300409 if (!first_ec)
410 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300411 return acpi_ec_burst_enable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300412}
413
414EXPORT_SYMBOL(ec_burst_enable);
415
416int ec_burst_disable(void)
417{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300418 if (!first_ec)
419 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300420 return acpi_ec_burst_disable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300421}
422
423EXPORT_SYMBOL(ec_burst_disable);
424
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300425int ec_read(u8 addr, u8 * val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 int err;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400428 u8 temp_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 if (!first_ec)
431 return -ENODEV;
432
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300433 err = acpi_ec_read(first_ec, addr, &temp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 if (!err) {
436 *val = temp_data;
437 return 0;
Len Brown50526df2005-08-11 17:32:05 -0400438 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 return err;
440}
Len Brown50526df2005-08-11 17:32:05 -0400441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442EXPORT_SYMBOL(ec_read);
443
Len Brown50526df2005-08-11 17:32:05 -0400444int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 int err;
447
448 if (!first_ec)
449 return -ENODEV;
450
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300451 err = acpi_ec_write(first_ec, addr, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 return err;
454}
Len Brown50526df2005-08-11 17:32:05 -0400455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456EXPORT_SYMBOL(ec_write);
457
Randy Dunlap616362d2006-10-27 01:47:34 -0400458int ec_transaction(u8 command,
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500459 const u8 * wdata, unsigned wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200460 u8 * rdata, unsigned rdata_len,
461 int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400462{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400463 struct transaction t = {.command = command,
464 .wdata = wdata, .rdata = rdata,
465 .wlen = wdata_len, .rlen = rdata_len};
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400466 if (!first_ec)
467 return -ENODEV;
468
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400469 return acpi_ec_transaction(first_ec, &t, force_poll);
Luming Yu45bea152005-07-23 04:08:00 -0400470}
Luming Yu45bea152005-07-23 04:08:00 -0400471
Lennart Poetteringab9e43c2006-10-03 22:49:00 -0400472EXPORT_SYMBOL(ec_transaction);
473
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300474static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400475{
476 int result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300477 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400478 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
479 .wdata = NULL, .rdata = &d,
480 .wlen = 0, .rlen = 1};
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300481 if (!ec || !data)
482 return -EINVAL;
Luming Yu45bea152005-07-23 04:08:00 -0400483
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300484 /*
485 * Query the EC to find out which _Qxx method we need to evaluate.
486 * Note that successful completion of the query causes the ACPI_EC_SCI
487 * bit to be cleared (and thus clearing the interrupt source).
488 */
Luming Yu45bea152005-07-23 04:08:00 -0400489
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400490 result = acpi_ec_transaction(ec, &t, 0);
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300491 if (result)
492 return result;
Luming Yu45bea152005-07-23 04:08:00 -0400493
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300494 if (!d)
495 return -ENODATA;
Luming Yu45bea152005-07-23 04:08:00 -0400496
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300497 *data = d;
498 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501/* --------------------------------------------------------------------------
502 Event Management
503 -------------------------------------------------------------------------- */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400504int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
505 acpi_handle handle, acpi_ec_query_func func,
506 void *data)
507{
508 struct acpi_ec_query_handler *handler =
509 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
510 if (!handler)
511 return -ENOMEM;
512
513 handler->query_bit = query_bit;
514 handler->handle = handle;
515 handler->func = func;
516 handler->data = data;
517 mutex_lock(&ec->lock);
Alexey Starikovskiy30c08572007-09-26 19:43:22 +0400518 list_add(&handler->node, &ec->list);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400519 mutex_unlock(&ec->lock);
520 return 0;
521}
522
523EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
524
525void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
526{
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200527 struct acpi_ec_query_handler *handler, *tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400528 mutex_lock(&ec->lock);
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200529 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400530 if (query_bit == handler->query_bit) {
531 list_del(&handler->node);
532 kfree(handler);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400533 }
534 }
535 mutex_unlock(&ec->lock);
536}
537
538EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Len Brown50526df2005-08-11 17:32:05 -0400540static void acpi_ec_gpe_query(void *ec_cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300542 struct acpi_ec *ec = ec_cxt;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400543 u8 value = 0;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400544 struct acpi_ec_query_handler *handler, copy;
Luming Yu45bea152005-07-23 04:08:00 -0400545
Alexey Starikovskiy5d0c2882006-12-07 18:42:16 +0300546 if (!ec || acpi_ec_query(ec, &value))
Alexey Starikovskiye41334c2006-12-07 18:42:16 +0300547 return;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400548 mutex_lock(&ec->lock);
549 list_for_each_entry(handler, &ec->list, node) {
550 if (value == handler->query_bit) {
551 /* have custom handler for this bit */
552 memcpy(&copy, handler, sizeof(copy));
553 mutex_unlock(&ec->lock);
554 if (copy.func) {
555 copy.func(copy.data);
556 } else if (copy.handle) {
557 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
558 }
559 return;
560 }
561 }
562 mutex_unlock(&ec->lock);
Luming Yu45bea152005-07-23 04:08:00 -0400563}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Len Brown50526df2005-08-11 17:32:05 -0400565static u32 acpi_ec_gpe_handler(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300567 struct acpi_ec *ec = data;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400568 u8 status;
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200569
Márton Németh3ebe08a2007-11-21 03:23:26 +0300570 pr_debug(PREFIX "~~~> interrupt\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400571 status = acpi_ec_read_status(ec);
572
Alexey Starikovskiy85179342008-11-11 12:54:11 +0300573 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) {
574 gpe_transaction(ec, status);
575 if (ec_transaction_done(ec) &&
576 (status & ACPI_EC_FLAG_IBF) == 0)
577 wake_up(&ec->wait);
578 }
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500579
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400580 ec_check_sci(ec, status);
581 if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
582 !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400583 /* this is non-query, must be confirmation */
Alan Jenkinsf8248432008-11-01 11:05:26 +0000584 if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
585 if (printk_ratelimit())
586 pr_info(PREFIX "non-query interrupt received,"
587 " switching to interrupt mode\n");
588 } else {
589 /* hush, STORM switches the mode every transaction */
590 pr_debug(PREFIX "non-query interrupt received,"
Márton Németh3ebe08a2007-11-21 03:23:26 +0300591 " switching to interrupt mode\n");
Alan Jenkinsf8248432008-11-01 11:05:26 +0000592 }
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400593 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400594 }
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400595 return ACPI_INTERRUPT_HANDLED;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300596}
597
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598/* --------------------------------------------------------------------------
599 Address Space Management
600 -------------------------------------------------------------------------- */
601
602static acpi_status
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400603acpi_ec_space_handler(u32 function, acpi_physical_address address,
604 u32 bits, acpi_integer *value,
Len Brown50526df2005-08-11 17:32:05 -0400605 void *handler_context, void *region_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300607 struct acpi_ec *ec = handler_context;
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300608 int result = 0, i;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400609 u8 temp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if ((address > 0xFF) || !value || !handler_context)
Patrick Mocheld550d982006-06-27 00:41:40 -0400612 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400614 if (function != ACPI_READ && function != ACPI_WRITE)
Patrick Mocheld550d982006-06-27 00:41:40 -0400615 return AE_BAD_PARAMETER;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400616
617 if (bits != 8 && acpi_strict)
618 return AE_BAD_PARAMETER;
619
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300620 acpi_ec_burst_enable(ec);
621
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300622 if (function == ACPI_READ) {
623 result = acpi_ec_read(ec, address, &temp);
624 *value = temp;
625 } else {
626 temp = 0xff & (*value);
627 result = acpi_ec_write(ec, address, temp);
628 }
629
630 for (i = 8; unlikely(bits - i > 0); i += 8) {
631 ++address;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400632 if (function == ACPI_READ) {
633 result = acpi_ec_read(ec, address, &temp);
634 (*value) |= ((acpi_integer)temp) << i;
635 } else {
636 temp = 0xff & ((*value) >> i);
637 result = acpi_ec_write(ec, address, temp);
638 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 }
640
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300641 acpi_ec_burst_disable(ec);
642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 switch (result) {
644 case -EINVAL:
Patrick Mocheld550d982006-06-27 00:41:40 -0400645 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 break;
647 case -ENODEV:
Patrick Mocheld550d982006-06-27 00:41:40 -0400648 return AE_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 break;
650 case -ETIME:
Patrick Mocheld550d982006-06-27 00:41:40 -0400651 return AE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 break;
653 default:
Patrick Mocheld550d982006-06-27 00:41:40 -0400654 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656}
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658/* --------------------------------------------------------------------------
659 FS Interface (/proc)
660 -------------------------------------------------------------------------- */
661
Len Brown50526df2005-08-11 17:32:05 -0400662static struct proc_dir_entry *acpi_ec_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Len Brown50526df2005-08-11 17:32:05 -0400664static int acpi_ec_read_info(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300666 struct acpi_ec *ec = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 if (!ec)
669 goto end;
670
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300671 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
672 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
673 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
674 seq_printf(seq, "use global lock:\t%s\n",
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400675 ec->global_lock ? "yes" : "no");
Len Brown50526df2005-08-11 17:32:05 -0400676 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400677 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678}
679
680static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
681{
682 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
683}
684
Jan Engelhardt070d8eb2009-01-12 00:07:55 +0100685static const struct file_operations acpi_ec_info_ops = {
Len Brown50526df2005-08-11 17:32:05 -0400686 .open = acpi_ec_info_open_fs,
687 .read = seq_read,
688 .llseek = seq_lseek,
689 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 .owner = THIS_MODULE,
691};
692
Len Brown50526df2005-08-11 17:32:05 -0400693static int acpi_ec_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Len Brown50526df2005-08-11 17:32:05 -0400695 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 if (!acpi_device_dir(device)) {
698 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown50526df2005-08-11 17:32:05 -0400699 acpi_ec_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400701 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
703
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700704 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
705 acpi_device_dir(device),
706 &acpi_ec_info_ops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400708 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400709 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
Len Brown50526df2005-08-11 17:32:05 -0400712static int acpi_ec_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 if (acpi_device_dir(device)) {
716 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
717 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
718 acpi_device_dir(device) = NULL;
719 }
720
Patrick Mocheld550d982006-06-27 00:41:40 -0400721 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722}
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724/* --------------------------------------------------------------------------
725 Driver Interface
726 -------------------------------------------------------------------------- */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300727static acpi_status
728ec_parse_io_ports(struct acpi_resource *resource, void *context);
729
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300730static struct acpi_ec *make_acpi_ec(void)
731{
732 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
733 if (!ec)
734 return NULL;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400735 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300736 mutex_init(&ec->lock);
737 init_waitqueue_head(&ec->wait);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400738 INIT_LIST_HEAD(&ec->list);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400739 spin_lock_init(&ec->curr_lock);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300740 return ec;
741}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400743static acpi_status
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400744acpi_ec_register_query_methods(acpi_handle handle, u32 level,
745 void *context, void **return_value)
746{
Lin Ming0175d562008-12-16 16:46:12 +0800747 char node_name[5];
748 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400749 struct acpi_ec *ec = context;
750 int value = 0;
Lin Ming0175d562008-12-16 16:46:12 +0800751 acpi_status status;
752
753 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
754
755 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400756 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
757 }
758 return AE_OK;
759}
760
761static acpi_status
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400762ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400763{
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400764 acpi_status status;
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500765 unsigned long long tmp = 0;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400766
767 struct acpi_ec *ec = context;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400768
769 /* clear addr values, ec_parse_io_ports depend on it */
770 ec->command_addr = ec->data_addr = 0;
771
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400772 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
773 ec_parse_io_ports, ec);
774 if (ACPI_FAILURE(status))
775 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400776
777 /* Get GPE bit assignment (EC events). */
778 /* TODO: Add support for _GPE returning a package */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400779 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400780 if (ACPI_FAILURE(status))
781 return status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400782 ec->gpe = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400783 /* Use the global lock for all EC transactions? */
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500784 tmp = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400785 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
786 ec->global_lock = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400787 ec->handle = handle;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400788 return AE_CTRL_TERMINATE;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400789}
790
Bjorn Helgaas5efc5472009-06-22 20:41:30 +0000791static int ec_install_handlers(struct acpi_ec *ec)
792{
793 acpi_status status;
794 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
795 return 0;
796 status = acpi_install_gpe_handler(NULL, ec->gpe,
797 ACPI_GPE_EDGE_TRIGGERED,
798 &acpi_ec_gpe_handler, ec);
799 if (ACPI_FAILURE(status))
800 return -ENODEV;
801 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
802 acpi_enable_gpe(NULL, ec->gpe);
803 status = acpi_install_address_space_handler(ec->handle,
804 ACPI_ADR_SPACE_EC,
805 &acpi_ec_space_handler,
806 NULL, ec);
807 if (ACPI_FAILURE(status)) {
808 if (status == AE_NOT_FOUND) {
809 /*
810 * Maybe OS fails in evaluating the _REG object.
811 * The AE_NOT_FOUND error will be ignored and OS
812 * continue to initialize EC.
813 */
814 printk(KERN_ERR "Fail in evaluating the _REG object"
815 " of EC device. Broken bios is suspected.\n");
816 } else {
817 acpi_remove_gpe_handler(NULL, ec->gpe,
818 &acpi_ec_gpe_handler);
819 return -ENODEV;
820 }
821 }
822
823 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
824 return 0;
825}
826
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400827static void ec_remove_handlers(struct acpi_ec *ec)
828{
829 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
830 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
Márton Németh3ebe08a2007-11-21 03:23:26 +0300831 pr_err(PREFIX "failed to remove space handler\n");
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400832 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
833 &acpi_ec_gpe_handler)))
Márton Németh3ebe08a2007-11-21 03:23:26 +0300834 pr_err(PREFIX "failed to remove gpe handler\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400835 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400836}
837
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400838static int acpi_ec_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400840 struct acpi_ec *ec = NULL;
Bjorn Helgaasd02be042009-06-22 20:41:35 +0000841 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300843 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
844 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
845
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400846 /* Check for boot EC */
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300847 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;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400856 }
857 if (ec_parse_device(device->handle, 0, ec, NULL) !=
858 AE_CTRL_TERMINATE) {
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300859 kfree(ec);
860 return -EINVAL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400861 }
862
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300863 ec->handle = device->handle;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300864
865 /* Find and register all query methods */
866 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
867 acpi_ec_register_query_methods, ec, NULL);
868
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400869 if (!first_ec)
870 first_ec = ec;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700871 device->driver_data = ec;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300872 acpi_ec_add_fs(device);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300873 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400874 ec->gpe, ec->command_addr, ec->data_addr);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300875 pr_info(PREFIX "driver started in %s mode\n",
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400876 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
Bjorn Helgaas5efc5472009-06-22 20:41:30 +0000877
878 ret = ec_install_handlers(ec);
879
880 /* EC is fully operational, allow queries */
881 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
882 return ret;
883}
884
Len Brown50526df2005-08-11 17:32:05 -0400885static int acpi_ec_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300887 struct acpi_ec *ec;
Adrian Bunk07ddf762007-07-29 17:00:37 +0200888 struct acpi_ec_query_handler *handler, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400891 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
893 ec = acpi_driver_data(device);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400894 mutex_lock(&ec->lock);
Adrian Bunk07ddf762007-07-29 17:00:37 +0200895 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400896 list_del(&handler->node);
897 kfree(handler);
898 }
899 mutex_unlock(&ec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 acpi_ec_remove_fs(device);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700901 device->driver_data = NULL;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300902 if (ec == first_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300903 first_ec = NULL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400904 kfree(ec);
Patrick Mocheld550d982006-06-27 00:41:40 -0400905 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
907
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908static acpi_status
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300909ec_parse_io_ports(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300911 struct acpi_ec *ec = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300913 if (resource->type != ACPI_RESOURCE_TYPE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 /*
917 * The first address region returned is the data port, and
918 * the second address region returned is the status/command
919 * port.
920 */
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300921 if (ec->data_addr == 0)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400922 ec->data_addr = resource->data.io.minimum;
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300923 else if (ec->command_addr == 0)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400924 ec->command_addr = resource->data.io.minimum;
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300925 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 return AE_OK;
929}
930
Len Brown50526df2005-08-11 17:32:05 -0400931static int acpi_ec_stop(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300933 struct acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400935 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 ec = acpi_driver_data(device);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300937 if (!ec)
938 return -EINVAL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400939 ec_remove_handlers(ec);
Alexey Starikovskiyf9319f92007-08-24 08:10:11 +0400940
Patrick Mocheld550d982006-06-27 00:41:40 -0400941 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942}
943
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500944int __init acpi_boot_ec_enable(void)
945{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400946 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500947 return 0;
948 if (!ec_install_handlers(boot_ec)) {
949 first_ec = boot_ec;
950 return 0;
951 }
952 return -EFAULT;
953}
954
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300955static const struct acpi_device_id ec_device_ids[] = {
956 {"PNP0C09", 0},
957 {"", 0},
958};
959
Len Brown50526df2005-08-11 17:32:05 -0400960int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300962 acpi_status status;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300963 struct acpi_ec *saved_ec = NULL;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300964 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300966 boot_ec = make_acpi_ec();
967 if (!boot_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300968 return -ENOMEM;
969 /*
970 * Generate a boot ec context
971 */
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500972 if (dmi_name_in_vendors("Micro-Star") ||
973 dmi_name_in_vendors("Notebook")) {
974 pr_info(PREFIX "Enabling special treatment for EC from MSI.\n");
975 EC_FLAGS_MSI = 1;
976 }
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300977 status = acpi_get_table(ACPI_SIG_ECDT, 1,
978 (struct acpi_table_header **)&ecdt_ptr);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400979 if (ACPI_SUCCESS(status)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300980 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400981 boot_ec->command_addr = ecdt_ptr->control.address;
982 boot_ec->data_addr = ecdt_ptr->data.address;
983 boot_ec->gpe = ecdt_ptr->gpe;
Len Brown4af8e102008-03-11 00:27:16 -0400984 boot_ec->handle = ACPI_ROOT_OBJECT;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300985 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300986 /* Don't trust ECDT, which comes from ASUSTek */
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400987 if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0)
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500988 goto install;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300989 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
990 if (!saved_ec)
991 return -ENOMEM;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400992 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500993 /* fall through */
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400994 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500995 /* This workaround is needed only on some broken machines,
996 * which require early EC, but fail to provide ECDT */
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500997 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
998 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
999 boot_ec, NULL);
1000 /* Check that acpi_get_devices actually find something */
1001 if (ACPI_FAILURE(status) || !boot_ec->handle)
1002 goto error;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +03001003 if (saved_ec) {
1004 /* try to find good ECDT from ASUSTek */
1005 if (saved_ec->command_addr != boot_ec->command_addr ||
1006 saved_ec->data_addr != boot_ec->data_addr ||
1007 saved_ec->gpe != boot_ec->gpe ||
1008 saved_ec->handle != boot_ec->handle)
1009 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
1010 "ECDT tables, which are very hard to workaround. "
1011 "Trying to use DSDT EC info instead. Please send "
1012 "output of acpidump to linux-acpi@vger.kernel.org\n");
1013 kfree(saved_ec);
1014 saved_ec = NULL;
1015 } else {
1016 /* We really need to limit this workaround, the only ASUS,
1017 * which needs it, has fake EC._INI method, so use it as flag.
1018 * Keep boot_ec struct as it will be needed soon.
1019 */
1020 acpi_handle dummy;
1021 if (!dmi_name_in_vendors("ASUS") ||
1022 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1023 &dummy)))
1024 return -ENODEV;
1025 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001026install:
1027 if (!ec_install_handlers(boot_ec)) {
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001028 first_ec = boot_ec;
Alexey Starikovskiye8284322007-03-07 22:28:00 +03001029 return 0;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001030 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001031error:
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +03001032 kfree(boot_ec);
1033 boot_ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 return -ENODEV;
1035}
1036
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001037static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1038{
1039 struct acpi_ec *ec = acpi_driver_data(device);
1040 /* Stop using GPE */
1041 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
1042 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
Alexey Starikovskiy0b7084a2008-10-25 21:48:46 +04001043 acpi_disable_gpe(NULL, ec->gpe);
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001044 return 0;
1045}
1046
1047static int acpi_ec_resume(struct acpi_device *device)
1048{
1049 struct acpi_ec *ec = acpi_driver_data(device);
1050 /* Enable use of GPE back */
1051 clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
Almer S. Tigelaar5aa63f02009-04-12 11:26:29 +00001052 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
Alexey Starikovskiy0b7084a2008-10-25 21:48:46 +04001053 acpi_enable_gpe(NULL, ec->gpe);
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001054 return 0;
1055}
1056
1057static struct acpi_driver acpi_ec_driver = {
1058 .name = "ec",
1059 .class = ACPI_EC_CLASS,
1060 .ids = ec_device_ids,
1061 .ops = {
1062 .add = acpi_ec_add,
1063 .remove = acpi_ec_remove,
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001064 .stop = acpi_ec_stop,
1065 .suspend = acpi_ec_suspend,
1066 .resume = acpi_ec_resume,
1067 },
1068};
1069
Bjorn Helgaasa5f820f2009-03-24 16:49:48 -06001070int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
Len Brown50526df2005-08-11 17:32:05 -04001072 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1075 if (!acpi_ec_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -04001076 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
1078 /* Now register the driver for the EC */
1079 result = acpi_bus_register_driver(&acpi_ec_driver);
1080 if (result < 0) {
1081 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -04001082 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 }
1084
Patrick Mocheld550d982006-06-27 00:41:40 -04001085 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086}
1087
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088/* EC driver currently not unloadable */
1089#if 0
Len Brown50526df2005-08-11 17:32:05 -04001090static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093 acpi_bus_unregister_driver(&acpi_ec_driver);
1094
1095 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1096
Patrick Mocheld550d982006-06-27 00:41:40 -04001097 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098}
Alexey Starikovskiy78439322007-10-22 14:18:43 +04001099#endif /* 0 */