blob: 5741d99d6034edaceb3183b81ae48cca873f0161 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Alexey Starikovskiy01f22462007-03-07 22:28:00 +03002 * ec.c - ACPI Embedded Controller Driver (v2.0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Alexey Starikovskiy01f22462007-03-07 22:28:00 +03004 * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * 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
Márton Némethd772b3b2008-01-23 22:34:09 -050029/* Uncomment next line to get verbose print outs*/
30/* #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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/io.h>
42#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
44#include <acpi/actypes.h>
45
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
Denis M. Sadykov703959d2006-09-26 19:50:33 +040068/* EC events */
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030069enum ec_event {
Denis M. Sadykov703959d2006-09-26 19:50:33 +040070 ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040071 ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040072};
73
Alexey Starikovskiy5c406412006-12-07 18:42:16 +030074#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040075#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
Alexey Starikovskiye6e82a32008-03-21 17:06:57 +030076#define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040077
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040078enum {
79 EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */
80 EC_FLAGS_QUERY_PENDING, /* Query is pending */
Alexey Starikovskiy78439322007-10-22 14:18:43 +040081 EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +030082 EC_FLAGS_NO_GPE, /* Don't use GPE mode */
Alexey Starikovskiy845625c2008-03-21 17:07:03 +030083 EC_FLAGS_RESCHEDULE_POLL /* Re-schedule poll */
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040085
86/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Alexey Starikovskiyd0338792007-03-07 22:28:00 +030087/* External interfaces use first EC only, so remember */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040088typedef int (*acpi_ec_query_func) (void *data);
89
90struct acpi_ec_query_handler {
91 struct list_head node;
92 acpi_ec_query_func func;
93 acpi_handle handle;
94 void *data;
95 u8 query_bit;
96};
97
Adrian Bunka854e082006-12-19 12:56:12 -080098static struct acpi_ec {
Denis M. Sadykov703959d2006-09-26 19:50:33 +040099 acpi_handle handle;
Alexey Starikovskiya86e2772006-12-07 18:42:16 +0300100 unsigned long gpe;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400101 unsigned long command_addr;
102 unsigned long data_addr;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400103 unsigned long global_lock;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400104 unsigned long flags;
Alexey Starikovskiyc787a852006-12-07 18:42:16 +0300105 struct mutex lock;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400106 wait_queue_head_t wait;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400107 struct list_head list;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300108 struct delayed_work work;
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300109 atomic_t irq_count;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400110 u8 handlers_installed;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300111} *boot_ec, *first_ec;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400112
Zhao Yakui25008222008-08-12 10:40:10 +0800113/*
114 * Some Asus system have exchanged ECDT data/command IO addresses.
115 */
116static int print_ecdt_error(const struct dmi_system_id *id)
117{
118 printk(KERN_NOTICE PREFIX "%s detected - "
119 "ECDT has exchanged control/data I/O address\n",
120 id->ident);
121 return 0;
122}
123
124static struct dmi_system_id __cpuinitdata ec_dmi_table[] = {
125 {
126 print_ecdt_error, "Asus L4R", {
127 DMI_MATCH(DMI_BIOS_VERSION, "1008.006"),
128 DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),
129 DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL},
130 {
131 print_ecdt_error, "Asus M6R", {
132 DMI_MATCH(DMI_BIOS_VERSION, "0207"),
133 DMI_MATCH(DMI_PRODUCT_NAME, "M6R"),
134 DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL},
135 {},
136};
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138/* --------------------------------------------------------------------------
139 Transaction Management
140 -------------------------------------------------------------------------- */
141
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400142static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300144 u8 x = inb(ec->command_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500145 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300146 return x;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400149static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400150{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300151 u8 x = inb(ec->data_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500152 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400153 return inb(ec->data_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400154}
155
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400156static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400157{
Márton Németh86dae012008-01-23 22:33:06 -0500158 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400159 outb(command, ec->command_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400160}
161
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400162static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400163{
Márton Németh86dae012008-01-23 22:33:06 -0500164 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400165 outb(data, ec->data_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400166}
167
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400168static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400169{
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400170 if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500171 return 0;
Alexey Starikovskiy78d0af32006-12-07 18:42:17 +0300172 if (event == ACPI_EC_EVENT_OBF_1) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400173 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400174 return 1;
Alexey Starikovskiy78d0af32006-12-07 18:42:17 +0300175 } else if (event == ACPI_EC_EVENT_IBF_0) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400176 if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400177 return 1;
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400178 }
179
180 return 0;
181}
182
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300183static void ec_schedule_ec_poll(struct acpi_ec *ec)
184{
185 if (test_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags))
186 schedule_delayed_work(&ec->work,
187 msecs_to_jiffies(ACPI_EC_DELAY));
188}
189
190static void ec_switch_to_poll_mode(struct acpi_ec *ec)
191{
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300192 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300193 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
194 acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
195 set_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
196}
197
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400198static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400199{
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300200 atomic_set(&ec->irq_count, 0);
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400201 if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
202 likely(!force_poll)) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400203 if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
204 msecs_to_jiffies(ACPI_EC_DELAY)))
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300205 return 0;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400206 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
207 if (acpi_ec_check_status(ec, event)) {
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300208 /* missing GPEs, switch back to poll mode */
209 if (printk_ratelimit())
210 pr_info(PREFIX "missing confirmations, "
Márton Németh3ebe08a2007-11-21 03:23:26 +0300211 "switch off interrupt mode.\n");
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300212 ec_switch_to_poll_mode(ec);
213 ec_schedule_ec_poll(ec);
214 return 0;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400215 }
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400216 } else {
217 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
218 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
219 while (time_before(jiffies, delay)) {
220 if (acpi_ec_check_status(ec, event))
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300221 return 0;
Alexey Starikovskiy1b7fc5a2008-06-06 11:49:33 -0400222 msleep(1);
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400223 }
Zhao Yakui9d699ed2008-08-11 10:33:31 +0800224 if (acpi_ec_check_status(ec,event))
225 return 0;
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300226 }
Alexey Starikovskiydc0e8492008-03-21 17:07:09 +0300227 pr_err(PREFIX "acpi_ec_wait timeout, status = 0x%2.2x, event = %s\n",
228 acpi_ec_read_status(ec),
229 (event == ACPI_EC_EVENT_OBF_1) ? "\"b0=1\"" : "\"b1=0\"");
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300230 return -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500231}
232
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400233static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300234 const u8 * wdata, unsigned wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200235 u8 * rdata, unsigned rdata_len,
236 int force_poll)
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400237{
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300238 int result = 0;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400239 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300240 pr_debug(PREFIX "transaction start\n");
Alexey Starikovskiydc0e8492008-03-21 17:07:09 +0300241 acpi_ec_write_cmd(ec, command);
Alexey Starikovskiy78d0af32006-12-07 18:42:17 +0300242 for (; wdata_len > 0; --wdata_len) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400243 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300244 if (result) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300245 pr_err(PREFIX
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300246 "write_cmd timeout, command = %d\n", command);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300247 goto end;
248 }
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400249 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400250 acpi_ec_write_data(ec, *(wdata++));
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400251 }
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400252
Alexey Starikovskiyd91df1a2006-12-07 18:42:16 +0300253 if (!rdata_len) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400254 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300255 if (result) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300256 pr_err(PREFIX
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300257 "finish-write timeout, command = %d\n", command);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300258 goto end;
259 }
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400260 } else if (command == ACPI_EC_COMMAND_QUERY)
261 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400262
Alexey Starikovskiy78d0af32006-12-07 18:42:17 +0300263 for (; rdata_len > 0; --rdata_len) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400264 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300265 if (result) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300266 pr_err(PREFIX "read timeout, command = %d\n", command);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300267 goto end;
268 }
Alexey Starikovskiy0c5d31f2007-10-22 14:18:36 +0400269 /* Don't expect GPE after last read */
270 if (rdata_len > 1)
271 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400272 *(rdata++) = acpi_ec_read_data(ec);
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400273 }
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300274 end:
Márton Németh3ebe08a2007-11-21 03:23:26 +0300275 pr_debug(PREFIX "transaction end\n");
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300276 return result;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400277}
278
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400279static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300280 const u8 * wdata, unsigned wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200281 u8 * rdata, unsigned rdata_len,
282 int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400283{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400284 int status;
Len Brown50526df2005-08-11 17:32:05 -0400285 u32 glk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400287 if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
Patrick Mocheld550d982006-06-27 00:41:40 -0400288 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300290 if (rdata)
291 memset(rdata, 0, rdata_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
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)) {
297 mutex_unlock(&ec->lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400298 return -ENODEV;
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500301
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400302 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
Luming Yu716e0842005-08-10 01:40:00 -0400303 if (status) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300304 pr_err(PREFIX "input buffer is not empty, "
305 "aborting transaction\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500306 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300309 status = acpi_ec_transaction_unlocked(ec, command,
310 wdata, wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200311 rdata, rdata_len,
312 force_poll);
Len Brown50526df2005-08-11 17:32:05 -0400313
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300314 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400316 if (ec->global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 acpi_release_global_lock(glk);
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300318 mutex_unlock(&ec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Patrick Mocheld550d982006-06-27 00:41:40 -0400320 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321}
322
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300323/*
324 * Note: samsung nv5000 doesn't work with ec burst mode.
325 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
326 */
327int acpi_ec_burst_enable(struct acpi_ec *ec)
328{
329 u8 d;
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200330 return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300331}
332
333int acpi_ec_burst_disable(struct acpi_ec *ec)
334{
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200335 return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300336}
337
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300338static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400339{
340 int result;
341 u8 d;
342
343 result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200344 &address, 1, &d, 1, 0);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400345 *data = d;
346 return result;
347}
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400348
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400349static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
350{
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300351 u8 wdata[2] = { address, data };
352 return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200353 wdata, 2, NULL, 0, 0);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400354}
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356/*
357 * Externally callable EC access functions. For now, assume 1 EC only
358 */
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300359int ec_burst_enable(void)
360{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300361 if (!first_ec)
362 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300363 return acpi_ec_burst_enable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300364}
365
366EXPORT_SYMBOL(ec_burst_enable);
367
368int ec_burst_disable(void)
369{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300370 if (!first_ec)
371 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300372 return acpi_ec_burst_disable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300373}
374
375EXPORT_SYMBOL(ec_burst_disable);
376
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300377int ec_read(u8 addr, u8 * val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 int err;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400380 u8 temp_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 if (!first_ec)
383 return -ENODEV;
384
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300385 err = acpi_ec_read(first_ec, addr, &temp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 if (!err) {
388 *val = temp_data;
389 return 0;
Len Brown50526df2005-08-11 17:32:05 -0400390 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return err;
392}
Len Brown50526df2005-08-11 17:32:05 -0400393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394EXPORT_SYMBOL(ec_read);
395
Len Brown50526df2005-08-11 17:32:05 -0400396int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 int err;
399
400 if (!first_ec)
401 return -ENODEV;
402
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300403 err = acpi_ec_write(first_ec, addr, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 return err;
406}
Len Brown50526df2005-08-11 17:32:05 -0400407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408EXPORT_SYMBOL(ec_write);
409
Randy Dunlap616362d2006-10-27 01:47:34 -0400410int ec_transaction(u8 command,
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500411 const u8 * wdata, unsigned wdata_len,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200412 u8 * rdata, unsigned rdata_len,
413 int force_poll)
Luming Yu45bea152005-07-23 04:08:00 -0400414{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400415 if (!first_ec)
416 return -ENODEV;
417
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300418 return acpi_ec_transaction(first_ec, command, wdata,
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200419 wdata_len, rdata, rdata_len,
420 force_poll);
Luming Yu45bea152005-07-23 04:08:00 -0400421}
Luming Yu45bea152005-07-23 04:08:00 -0400422
Lennart Poetteringab9e43c2006-10-03 22:49:00 -0400423EXPORT_SYMBOL(ec_transaction);
424
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300425static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400426{
427 int result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300428 u8 d;
Luming Yu45bea152005-07-23 04:08:00 -0400429
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300430 if (!ec || !data)
431 return -EINVAL;
Luming Yu45bea152005-07-23 04:08:00 -0400432
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300433 /*
434 * Query the EC to find out which _Qxx method we need to evaluate.
435 * Note that successful completion of the query causes the ACPI_EC_SCI
436 * bit to be cleared (and thus clearing the interrupt source).
437 */
Luming Yu45bea152005-07-23 04:08:00 -0400438
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200439 result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300440 if (result)
441 return result;
Luming Yu45bea152005-07-23 04:08:00 -0400442
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300443 if (!d)
444 return -ENODATA;
Luming Yu45bea152005-07-23 04:08:00 -0400445
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300446 *data = d;
447 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450/* --------------------------------------------------------------------------
451 Event Management
452 -------------------------------------------------------------------------- */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400453int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
454 acpi_handle handle, acpi_ec_query_func func,
455 void *data)
456{
457 struct acpi_ec_query_handler *handler =
458 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
459 if (!handler)
460 return -ENOMEM;
461
462 handler->query_bit = query_bit;
463 handler->handle = handle;
464 handler->func = func;
465 handler->data = data;
466 mutex_lock(&ec->lock);
Alexey Starikovskiy30c08572007-09-26 19:43:22 +0400467 list_add(&handler->node, &ec->list);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400468 mutex_unlock(&ec->lock);
469 return 0;
470}
471
472EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
473
474void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
475{
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200476 struct acpi_ec_query_handler *handler, *tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400477 mutex_lock(&ec->lock);
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200478 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400479 if (query_bit == handler->query_bit) {
480 list_del(&handler->node);
481 kfree(handler);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400482 }
483 }
484 mutex_unlock(&ec->lock);
485}
486
487EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Len Brown50526df2005-08-11 17:32:05 -0400489static void acpi_ec_gpe_query(void *ec_cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300491 struct acpi_ec *ec = ec_cxt;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400492 u8 value = 0;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400493 struct acpi_ec_query_handler *handler, copy;
Luming Yu45bea152005-07-23 04:08:00 -0400494
Alexey Starikovskiy5d0c2882006-12-07 18:42:16 +0300495 if (!ec || acpi_ec_query(ec, &value))
Alexey Starikovskiye41334c2006-12-07 18:42:16 +0300496 return;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400497 mutex_lock(&ec->lock);
498 list_for_each_entry(handler, &ec->list, node) {
499 if (value == handler->query_bit) {
500 /* have custom handler for this bit */
501 memcpy(&copy, handler, sizeof(copy));
502 mutex_unlock(&ec->lock);
503 if (copy.func) {
504 copy.func(copy.data);
505 } else if (copy.handle) {
506 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
507 }
508 return;
509 }
510 }
511 mutex_unlock(&ec->lock);
Luming Yu45bea152005-07-23 04:08:00 -0400512}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Len Brown50526df2005-08-11 17:32:05 -0400514static u32 acpi_ec_gpe_handler(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Len Brown50526df2005-08-11 17:32:05 -0400516 acpi_status status = AE_OK;
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300517 struct acpi_ec *ec = data;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300518 u8 state = acpi_ec_read_status(ec);
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200519
Márton Németh3ebe08a2007-11-21 03:23:26 +0300520 pr_debug(PREFIX "~~~> interrupt\n");
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300521 atomic_inc(&ec->irq_count);
522 if (atomic_read(&ec->irq_count) > 5) {
523 pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
524 ec_switch_to_poll_mode(ec);
525 goto end;
526 }
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400527 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400528 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300529 wake_up(&ec->wait);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500530
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300531 if (state & ACPI_EC_FLAG_SCI) {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400532 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
533 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
534 acpi_ec_gpe_query, ec);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300535 } else if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300536 !test_bit(EC_FLAGS_NO_GPE, &ec->flags) &&
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300537 in_interrupt()) {
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400538 /* this is non-query, must be confirmation */
Márton Németh3ebe08a2007-11-21 03:23:26 +0300539 if (printk_ratelimit())
540 pr_info(PREFIX "non-query interrupt received,"
541 " switching to interrupt mode\n");
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400542 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300543 clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400544 }
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300545end:
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300546 ec_schedule_ec_poll(ec);
Alexey Starikovskiy78439322007-10-22 14:18:43 +0400547 return ACPI_SUCCESS(status) ?
Len Brown50526df2005-08-11 17:32:05 -0400548 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549}
550
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300551static void do_ec_poll(struct work_struct *work)
552{
553 struct acpi_ec *ec = container_of(work, struct acpi_ec, work.work);
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300554 atomic_set(&ec->irq_count, 0);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300555 (void)acpi_ec_gpe_handler(ec);
556}
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558/* --------------------------------------------------------------------------
559 Address Space Management
560 -------------------------------------------------------------------------- */
561
562static acpi_status
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400563acpi_ec_space_handler(u32 function, acpi_physical_address address,
564 u32 bits, acpi_integer *value,
Len Brown50526df2005-08-11 17:32:05 -0400565 void *handler_context, void *region_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300567 struct acpi_ec *ec = handler_context;
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300568 int result = 0, i;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400569 u8 temp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if ((address > 0xFF) || !value || !handler_context)
Patrick Mocheld550d982006-06-27 00:41:40 -0400572 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400574 if (function != ACPI_READ && function != ACPI_WRITE)
Patrick Mocheld550d982006-06-27 00:41:40 -0400575 return AE_BAD_PARAMETER;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400576
577 if (bits != 8 && acpi_strict)
578 return AE_BAD_PARAMETER;
579
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300580 acpi_ec_burst_enable(ec);
581
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300582 if (function == ACPI_READ) {
583 result = acpi_ec_read(ec, address, &temp);
584 *value = temp;
585 } else {
586 temp = 0xff & (*value);
587 result = acpi_ec_write(ec, address, temp);
588 }
589
590 for (i = 8; unlikely(bits - i > 0); i += 8) {
591 ++address;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400592 if (function == ACPI_READ) {
593 result = acpi_ec_read(ec, address, &temp);
594 (*value) |= ((acpi_integer)temp) << i;
595 } else {
596 temp = 0xff & ((*value) >> i);
597 result = acpi_ec_write(ec, address, temp);
598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 }
600
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300601 acpi_ec_burst_disable(ec);
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 switch (result) {
604 case -EINVAL:
Patrick Mocheld550d982006-06-27 00:41:40 -0400605 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 break;
607 case -ENODEV:
Patrick Mocheld550d982006-06-27 00:41:40 -0400608 return AE_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 break;
610 case -ETIME:
Patrick Mocheld550d982006-06-27 00:41:40 -0400611 return AE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 break;
613 default:
Patrick Mocheld550d982006-06-27 00:41:40 -0400614 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616}
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618/* --------------------------------------------------------------------------
619 FS Interface (/proc)
620 -------------------------------------------------------------------------- */
621
Len Brown50526df2005-08-11 17:32:05 -0400622static struct proc_dir_entry *acpi_ec_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
Len Brown50526df2005-08-11 17:32:05 -0400624static int acpi_ec_read_info(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300626 struct acpi_ec *ec = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 if (!ec)
629 goto end;
630
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300631 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
632 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
633 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
634 seq_printf(seq, "use global lock:\t%s\n",
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400635 ec->global_lock ? "yes" : "no");
Len Brown50526df2005-08-11 17:32:05 -0400636 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400637 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
640static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
641{
642 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
643}
644
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400645static struct file_operations acpi_ec_info_ops = {
Len Brown50526df2005-08-11 17:32:05 -0400646 .open = acpi_ec_info_open_fs,
647 .read = seq_read,
648 .llseek = seq_lseek,
649 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 .owner = THIS_MODULE,
651};
652
Len Brown50526df2005-08-11 17:32:05 -0400653static int acpi_ec_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654{
Len Brown50526df2005-08-11 17:32:05 -0400655 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (!acpi_device_dir(device)) {
658 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown50526df2005-08-11 17:32:05 -0400659 acpi_ec_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400661 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
663
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700664 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
665 acpi_device_dir(device),
666 &acpi_ec_info_ops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400668 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400669 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670}
671
Len Brown50526df2005-08-11 17:32:05 -0400672static int acpi_ec_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
675 if (acpi_device_dir(device)) {
676 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
677 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
678 acpi_device_dir(device) = NULL;
679 }
680
Patrick Mocheld550d982006-06-27 00:41:40 -0400681 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684/* --------------------------------------------------------------------------
685 Driver Interface
686 -------------------------------------------------------------------------- */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300687static acpi_status
688ec_parse_io_ports(struct acpi_resource *resource, void *context);
689
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300690static struct acpi_ec *make_acpi_ec(void)
691{
692 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
693 if (!ec)
694 return NULL;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400695 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300696 mutex_init(&ec->lock);
697 init_waitqueue_head(&ec->wait);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400698 INIT_LIST_HEAD(&ec->list);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300699 INIT_DELAYED_WORK_DEFERRABLE(&ec->work, do_ec_poll);
Alexey Starikovskiyfa95ba02008-03-21 19:36:02 +0300700 atomic_set(&ec->irq_count, 0);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300701 return ec;
702}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400704static acpi_status
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400705acpi_ec_register_query_methods(acpi_handle handle, u32 level,
706 void *context, void **return_value)
707{
708 struct acpi_namespace_node *node = handle;
709 struct acpi_ec *ec = context;
710 int value = 0;
711 if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
712 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
713 }
714 return AE_OK;
715}
716
717static acpi_status
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400718ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400719{
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400720 acpi_status status;
721
722 struct acpi_ec *ec = context;
723 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
724 ec_parse_io_ports, ec);
725 if (ACPI_FAILURE(status))
726 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400727
728 /* Get GPE bit assignment (EC events). */
729 /* TODO: Add support for _GPE returning a package */
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400730 status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
731 if (ACPI_FAILURE(status))
732 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400733 /* Use the global lock for all EC transactions? */
734 acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400735 ec->handle = handle;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400736 return AE_CTRL_TERMINATE;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400737}
738
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300739static void ec_poll_stop(struct acpi_ec *ec)
740{
741 clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
742 cancel_delayed_work(&ec->work);
743}
744
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400745static void ec_remove_handlers(struct acpi_ec *ec)
746{
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300747 ec_poll_stop(ec);
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400748 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
749 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
Márton Németh3ebe08a2007-11-21 03:23:26 +0300750 pr_err(PREFIX "failed to remove space handler\n");
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400751 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
752 &acpi_ec_gpe_handler)))
Márton Németh3ebe08a2007-11-21 03:23:26 +0300753 pr_err(PREFIX "failed to remove gpe handler\n");
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400754 ec->handlers_installed = 0;
755}
756
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400757static int acpi_ec_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400759 struct acpi_ec *ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400762 return -EINVAL;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300763 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
764 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
765
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400766 /* Check for boot EC */
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300767 if (boot_ec &&
768 (boot_ec->handle == device->handle ||
769 boot_ec->handle == ACPI_ROOT_OBJECT)) {
770 ec = boot_ec;
771 boot_ec = NULL;
772 } else {
773 ec = make_acpi_ec();
774 if (!ec)
775 return -ENOMEM;
776 if (ec_parse_device(device->handle, 0, ec, NULL) !=
777 AE_CTRL_TERMINATE) {
778 kfree(ec);
779 return -EINVAL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400780 }
781 }
782
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300783 ec->handle = device->handle;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300784
785 /* Find and register all query methods */
786 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
787 acpi_ec_register_query_methods, ec, NULL);
788
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400789 if (!first_ec)
790 first_ec = ec;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700791 device->driver_data = ec;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300792 acpi_ec_add_fs(device);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300793 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400794 ec->gpe, ec->command_addr, ec->data_addr);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300795 pr_info(PREFIX "driver started in %s mode\n",
Alexey Starikovskiy95b937e2007-10-22 14:19:03 +0400796 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300797 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798}
799
Len Brown50526df2005-08-11 17:32:05 -0400800static int acpi_ec_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300802 struct acpi_ec *ec;
Adrian Bunk07ddf762007-07-29 17:00:37 +0200803 struct acpi_ec_query_handler *handler, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400806 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 ec = acpi_driver_data(device);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400809 mutex_lock(&ec->lock);
Adrian Bunk07ddf762007-07-29 17:00:37 +0200810 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400811 list_del(&handler->node);
812 kfree(handler);
813 }
814 mutex_unlock(&ec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 acpi_ec_remove_fs(device);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700816 device->driver_data = NULL;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300817 if (ec == first_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300818 first_ec = NULL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400819 kfree(ec);
Patrick Mocheld550d982006-06-27 00:41:40 -0400820 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821}
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823static acpi_status
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300824ec_parse_io_ports(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300826 struct acpi_ec *ec = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300828 if (resource->type != ACPI_RESOURCE_TYPE_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 /*
832 * The first address region returned is the data port, and
833 * the second address region returned is the status/command
834 * port.
835 */
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300836 if (ec->data_addr == 0)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400837 ec->data_addr = resource->data.io.minimum;
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300838 else if (ec->command_addr == 0)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400839 ec->command_addr = resource->data.io.minimum;
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300840 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 return AE_OK;
844}
845
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300846static int ec_install_handlers(struct acpi_ec *ec)
847{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300848 acpi_status status;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400849 if (ec->handlers_installed)
850 return 0;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300851 status = acpi_install_gpe_handler(NULL, ec->gpe,
852 ACPI_GPE_EDGE_TRIGGERED,
853 &acpi_ec_gpe_handler, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300854 if (ACPI_FAILURE(status))
855 return -ENODEV;
Alexey Starikovskiy01f22462007-03-07 22:28:00 +0300856
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300857 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
858 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
859
860 status = acpi_install_address_space_handler(ec->handle,
861 ACPI_ADR_SPACE_EC,
862 &acpi_ec_space_handler,
Alexey Starikovskiy6d9e1122008-03-24 23:22:29 +0300863 NULL, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300864 if (ACPI_FAILURE(status)) {
865 acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
866 return -ENODEV;
867 }
868
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400869 ec->handlers_installed = 1;
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300870 return 0;
871}
872
Len Brown50526df2005-08-11 17:32:05 -0400873static int acpi_ec_start(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300875 struct acpi_ec *ec;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400876 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400879 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 ec = acpi_driver_data(device);
882
883 if (!ec)
Patrick Mocheld550d982006-06-27 00:41:40 -0400884 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400886 ret = ec_install_handlers(ec);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300887
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400888 /* EC is fully operational, allow queries */
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400889 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300890 ec_schedule_ec_poll(ec);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400891 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
Len Brown50526df2005-08-11 17:32:05 -0400894static int acpi_ec_stop(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300896 struct acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400898 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 ec = acpi_driver_data(device);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300900 if (!ec)
901 return -EINVAL;
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400902 ec_remove_handlers(ec);
Alexey Starikovskiyf9319f92007-08-24 08:10:11 +0400903
Patrick Mocheld550d982006-06-27 00:41:40 -0400904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500907int __init acpi_boot_ec_enable(void)
908{
909 if (!boot_ec || boot_ec->handlers_installed)
910 return 0;
911 if (!ec_install_handlers(boot_ec)) {
912 first_ec = boot_ec;
913 return 0;
914 }
915 return -EFAULT;
916}
917
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300918static const struct acpi_device_id ec_device_ids[] = {
919 {"PNP0C09", 0},
920 {"", 0},
921};
922
Len Brown50526df2005-08-11 17:32:05 -0400923int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924{
Len Brown50526df2005-08-11 17:32:05 -0400925 int ret;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300926 acpi_status status;
927 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300929 boot_ec = make_acpi_ec();
930 if (!boot_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300931 return -ENOMEM;
932 /*
933 * Generate a boot ec context
934 */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300935 status = acpi_get_table(ACPI_SIG_ECDT, 1,
936 (struct acpi_table_header **)&ecdt_ptr);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400937 if (ACPI_SUCCESS(status)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300938 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400939 boot_ec->command_addr = ecdt_ptr->control.address;
940 boot_ec->data_addr = ecdt_ptr->data.address;
Zhao Yakui25008222008-08-12 10:40:10 +0800941 if (dmi_check_system(ec_dmi_table)) {
942 /*
943 * If the board falls into ec_dmi_table, it means
944 * that ECDT table gives the incorrect command/status
945 * & data I/O address. Just fix it.
946 */
947 boot_ec->data_addr = ecdt_ptr->control.address;
948 boot_ec->command_addr = ecdt_ptr->data.address;
949 }
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400950 boot_ec->gpe = ecdt_ptr->gpe;
Len Brown4af8e102008-03-11 00:27:16 -0400951 boot_ec->handle = ACPI_ROOT_OBJECT;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300952 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400953 } else {
Alexey Starikovskiy5870a8c2007-11-15 21:52:47 +0300954 /* This workaround is needed only on some broken machines,
955 * which require early EC, but fail to provide ECDT */
956 acpi_handle x;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400957 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
958 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
959 boot_ec, NULL);
Alexey Starikovskiy2d8348b2007-08-31 09:05:26 +0400960 /* Check that acpi_get_devices actually find something */
961 if (ACPI_FAILURE(status) || !boot_ec->handle)
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400962 goto error;
Alexey Starikovskiy5870a8c2007-11-15 21:52:47 +0300963 /* We really need to limit this workaround, the only ASUS,
964 * which needs it, has fake EC._INI method, so use it as flag.
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500965 * Keep boot_ec struct as it will be needed soon.
Alexey Starikovskiy5870a8c2007-11-15 21:52:47 +0300966 */
967 if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500968 return -ENODEV;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400969 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300971 ret = ec_install_handlers(boot_ec);
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300972 if (!ret) {
973 first_ec = boot_ec;
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300974 return 0;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300975 }
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300976 error:
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300977 kfree(boot_ec);
978 boot_ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 return -ENODEV;
980}
981
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300982static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
983{
984 struct acpi_ec *ec = acpi_driver_data(device);
985 /* Stop using GPE */
986 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
987 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
988 acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
989 return 0;
990}
991
992static int acpi_ec_resume(struct acpi_device *device)
993{
994 struct acpi_ec *ec = acpi_driver_data(device);
995 /* Enable use of GPE back */
996 clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
997 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
998 return 0;
999}
1000
1001static struct acpi_driver acpi_ec_driver = {
1002 .name = "ec",
1003 .class = ACPI_EC_CLASS,
1004 .ids = ec_device_ids,
1005 .ops = {
1006 .add = acpi_ec_add,
1007 .remove = acpi_ec_remove,
1008 .start = acpi_ec_start,
1009 .stop = acpi_ec_stop,
1010 .suspend = acpi_ec_suspend,
1011 .resume = acpi_ec_resume,
1012 },
1013};
1014
Len Brown50526df2005-08-11 17:32:05 -04001015static int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
Len Brown50526df2005-08-11 17:32:05 -04001017 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -04001020 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
1022 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1023 if (!acpi_ec_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -04001024 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
1026 /* Now register the driver for the EC */
1027 result = acpi_bus_register_driver(&acpi_ec_driver);
1028 if (result < 0) {
1029 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -04001030 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032
Patrick Mocheld550d982006-06-27 00:41:40 -04001033 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034}
1035
1036subsys_initcall(acpi_ec_init);
1037
1038/* EC driver currently not unloadable */
1039#if 0
Len Brown50526df2005-08-11 17:32:05 -04001040static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
1043 acpi_bus_unregister_driver(&acpi_ec_driver);
1044
1045 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1046
Patrick Mocheld550d982006-06-27 00:41:40 -04001047 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048}
Alexey Starikovskiy78439322007-10-22 14:18:43 +04001049#endif /* 0 */