Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
01f22462 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.0) |
1da177e4 | 3 | * |
01f22462 AS |
4 | * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> | |
1da177e4 LT |
6 | * 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 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
451566f4 | 36 | #include <linux/interrupt.h> |
837012ed | 37 | #include <linux/list.h> |
1da177e4 LT |
38 | #include <asm/io.h> |
39 | #include <acpi/acpi_bus.h> | |
40 | #include <acpi/acpi_drivers.h> | |
41 | #include <acpi/actypes.h> | |
42 | ||
1da177e4 | 43 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
44 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
45 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 46 | |
af3fd140 AS |
47 | #undef PREFIX |
48 | #define PREFIX "ACPI: EC: " | |
4350933a | 49 | |
3ebe08a7 MN |
50 | /* Uncomment next line to get verbose print outs*/ |
51 | /* #define DEBUG */ | |
52 | ||
703959d4 | 53 | /* EC status register */ |
1da177e4 LT |
54 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
55 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 56 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 57 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 58 | |
703959d4 | 59 | /* EC commands */ |
3261ff4d | 60 | enum ec_command { |
6ccedb10 AS |
61 | 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, | |
3261ff4d | 66 | }; |
837012ed | 67 | |
703959d4 | 68 | /* EC events */ |
3261ff4d | 69 | enum ec_event { |
703959d4 | 70 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
080e412c | 71 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
72 | }; |
73 | ||
5c406412 | 74 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 75 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 76 | |
080e412c AS |
77 | enum { |
78 | EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ | |
79 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ | |
7843932a | 80 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ |
f2d68935 AS |
81 | EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ |
82 | EC_FLAGS_ADDRESS, /* Address is being written */ | |
e790cc8b AS |
83 | EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */ |
84 | EC_FLAGS_WDATA, /* Data is being written */ | |
080e412c AS |
85 | }; |
86 | ||
50526df6 LB |
87 | static int acpi_ec_remove(struct acpi_device *device, int type); |
88 | static int acpi_ec_start(struct acpi_device *device); | |
89 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 90 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 | 91 | |
1ba90e3a TR |
92 | static const struct acpi_device_id ec_device_ids[] = { |
93 | {"PNP0C09", 0}, | |
94 | {"", 0}, | |
95 | }; | |
96 | ||
1da177e4 | 97 | static struct acpi_driver acpi_ec_driver = { |
c2b6705b | 98 | .name = "ec", |
50526df6 | 99 | .class = ACPI_EC_CLASS, |
1ba90e3a | 100 | .ids = ec_device_ids, |
50526df6 | 101 | .ops = { |
703959d4 | 102 | .add = acpi_ec_add, |
50526df6 LB |
103 | .remove = acpi_ec_remove, |
104 | .start = acpi_ec_start, | |
105 | .stop = acpi_ec_stop, | |
106 | }, | |
1da177e4 | 107 | }; |
6ffb221a DS |
108 | |
109 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 110 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
111 | typedef int (*acpi_ec_query_func) (void *data); |
112 | ||
113 | struct acpi_ec_query_handler { | |
114 | struct list_head node; | |
115 | acpi_ec_query_func func; | |
116 | acpi_handle handle; | |
117 | void *data; | |
118 | u8 query_bit; | |
119 | }; | |
120 | ||
a854e08a | 121 | static struct acpi_ec { |
703959d4 | 122 | acpi_handle handle; |
a86e2772 | 123 | unsigned long gpe; |
6ffb221a DS |
124 | unsigned long command_addr; |
125 | unsigned long data_addr; | |
703959d4 | 126 | unsigned long global_lock; |
080e412c | 127 | unsigned long flags; |
c787a855 | 128 | struct mutex lock; |
703959d4 | 129 | wait_queue_head_t wait; |
837012ed | 130 | struct list_head list; |
4c611060 | 131 | u8 handlers_installed; |
d033879c | 132 | } *boot_ec, *first_ec; |
703959d4 | 133 | |
1da177e4 LT |
134 | /* -------------------------------------------------------------------------- |
135 | Transaction Management | |
136 | -------------------------------------------------------------------------- */ | |
137 | ||
6ffb221a | 138 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 139 | { |
3ebe08a7 MN |
140 | u8 x = inb(ec->command_addr); |
141 | pr_debug(PREFIX "---> status = 0x%2x\n", x); | |
142 | return x; | |
451566f4 DT |
143 | } |
144 | ||
6ffb221a | 145 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 146 | { |
3ebe08a7 MN |
147 | u8 x = inb(ec->data_addr); |
148 | pr_debug(PREFIX "---> data = 0x%2x\n", x); | |
6ffb221a | 149 | return inb(ec->data_addr); |
7c6db5e5 DS |
150 | } |
151 | ||
6ffb221a | 152 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 153 | { |
3ebe08a7 | 154 | pr_debug(PREFIX "<--- command = 0x%2x\n", command); |
6ffb221a | 155 | outb(command, ec->command_addr); |
45bea155 LY |
156 | } |
157 | ||
6ffb221a | 158 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 159 | { |
3ebe08a7 | 160 | pr_debug(PREFIX "<--- data = 0x%2x\n", data); |
6ffb221a | 161 | outb(data, ec->data_addr); |
703959d4 | 162 | } |
45bea155 | 163 | |
080e412c | 164 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 165 | { |
080e412c | 166 | if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags)) |
9e197219 | 167 | return 0; |
78d0af33 | 168 | if (event == ACPI_EC_EVENT_OBF_1) { |
080e412c | 169 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
703959d4 | 170 | return 1; |
78d0af33 | 171 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
080e412c | 172 | if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) |
703959d4 | 173 | return 1; |
45bea155 LY |
174 | } |
175 | ||
703959d4 | 176 | return 0; |
45bea155 | 177 | } |
451566f4 | 178 | |
080e412c | 179 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) |
7c6db5e5 | 180 | { |
f2d68935 AS |
181 | int ret = 0; |
182 | if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && | |
183 | test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) | |
184 | force_poll = 1; | |
e790cc8b AS |
185 | if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) && |
186 | test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags))) | |
187 | force_poll = 1; | |
7843932a AS |
188 | if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && |
189 | likely(!force_poll)) { | |
080e412c AS |
190 | if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), |
191 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
f2d68935 | 192 | goto end; |
080e412c AS |
193 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
194 | if (acpi_ec_check_status(ec, event)) { | |
f2d68935 AS |
195 | if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { |
196 | /* miss address GPE, don't expect it anymore */ | |
e790cc8b | 197 | pr_info(PREFIX "missing address confirmation, " |
f2d68935 AS |
198 | "don't expect it any longer.\n"); |
199 | set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); | |
e790cc8b AS |
200 | } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) { |
201 | /* miss write data GPE, don't expect it */ | |
202 | pr_info(PREFIX "missing write data confirmation, " | |
203 | "don't expect it any longer.\n"); | |
204 | set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags); | |
95b937e3 | 205 | } else { |
66c5f4e7 | 206 | /* missing GPEs, switch back to poll mode */ |
3ebe08a7 | 207 | if (printk_ratelimit()) |
e790cc8b | 208 | pr_info(PREFIX "missing confirmations, " |
3ebe08a7 | 209 | "switch off interrupt mode.\n"); |
66c5f4e7 | 210 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 211 | } |
f2d68935 | 212 | goto end; |
703959d4 | 213 | } |
7843932a AS |
214 | } else { |
215 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
216 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
217 | while (time_before(jiffies, delay)) { | |
218 | if (acpi_ec_check_status(ec, event)) | |
f2d68935 | 219 | goto end; |
7843932a | 220 | } |
af3fd140 | 221 | } |
3ebe08a7 | 222 | pr_err(PREFIX "acpi_ec_wait timeout," |
080e412c AS |
223 | " status = %d, expect_event = %d\n", |
224 | acpi_ec_read_status(ec), event); | |
f2d68935 AS |
225 | ret = -ETIME; |
226 | end: | |
227 | clear_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
228 | return ret; | |
1da177e4 LT |
229 | } |
230 | ||
703959d4 | 231 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 232 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
233 | u8 * rdata, unsigned rdata_len, |
234 | int force_poll) | |
45bea155 | 235 | { |
af3fd140 | 236 | int result = 0; |
080e412c | 237 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 238 | acpi_ec_write_cmd(ec, command); |
3ebe08a7 | 239 | pr_debug(PREFIX "transaction start\n"); |
78d0af33 | 240 | for (; wdata_len > 0; --wdata_len) { |
080e412c | 241 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 242 | if (result) { |
3ebe08a7 | 243 | pr_err(PREFIX |
6ccedb10 | 244 | "write_cmd timeout, command = %d\n", command); |
af3fd140 AS |
245 | goto end; |
246 | } | |
f2d68935 AS |
247 | /* mark the address byte written to EC */ |
248 | if (rdata_len + wdata_len > 1) | |
249 | set_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
080e412c | 250 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 251 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 252 | } |
45bea155 | 253 | |
d91df1aa | 254 | if (!rdata_len) { |
e790cc8b | 255 | set_bit(EC_FLAGS_WDATA, &ec->flags); |
080e412c | 256 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 257 | if (result) { |
3ebe08a7 | 258 | pr_err(PREFIX |
6ccedb10 | 259 | "finish-write timeout, command = %d\n", command); |
af3fd140 AS |
260 | goto end; |
261 | } | |
080e412c AS |
262 | } else if (command == ACPI_EC_COMMAND_QUERY) |
263 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
45bea155 | 264 | |
78d0af33 | 265 | for (; rdata_len > 0; --rdata_len) { |
080e412c | 266 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); |
af3fd140 | 267 | if (result) { |
3ebe08a7 | 268 | pr_err(PREFIX "read timeout, command = %d\n", command); |
af3fd140 AS |
269 | goto end; |
270 | } | |
0c5d31f4 AS |
271 | /* Don't expect GPE after last read */ |
272 | if (rdata_len > 1) | |
273 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
6ffb221a | 274 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 275 | } |
af3fd140 | 276 | end: |
3ebe08a7 | 277 | pr_debug(PREFIX "transaction end\n"); |
af3fd140 | 278 | return result; |
45bea155 LY |
279 | } |
280 | ||
3576cf61 | 281 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 282 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
283 | u8 * rdata, unsigned rdata_len, |
284 | int force_poll) | |
1da177e4 | 285 | { |
d7a76e4c | 286 | int status; |
50526df6 | 287 | u32 glk; |
1da177e4 | 288 | |
d7a76e4c | 289 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 290 | return -EINVAL; |
1da177e4 | 291 | |
6ccedb10 AS |
292 | if (rdata) |
293 | memset(rdata, 0, rdata_len); | |
1da177e4 | 294 | |
523953b4 | 295 | mutex_lock(&ec->lock); |
703959d4 | 296 | if (ec->global_lock) { |
1da177e4 | 297 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
298 | if (ACPI_FAILURE(status)) { |
299 | mutex_unlock(&ec->lock); | |
d550d98d | 300 | return -ENODEV; |
c24e912b | 301 | } |
1da177e4 | 302 | } |
451566f4 | 303 | |
080e412c | 304 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 305 | if (status) { |
3ebe08a7 MN |
306 | pr_err(PREFIX "input buffer is not empty, " |
307 | "aborting transaction\n"); | |
451566f4 | 308 | goto end; |
716e084e | 309 | } |
1da177e4 | 310 | |
6ccedb10 AS |
311 | status = acpi_ec_transaction_unlocked(ec, command, |
312 | wdata, wdata_len, | |
00eb43a1 LP |
313 | rdata, rdata_len, |
314 | force_poll); | |
1da177e4 | 315 | |
6ccedb10 | 316 | end: |
1da177e4 | 317 | |
703959d4 | 318 | if (ec->global_lock) |
1da177e4 | 319 | acpi_release_global_lock(glk); |
523953b4 | 320 | mutex_unlock(&ec->lock); |
1da177e4 | 321 | |
d550d98d | 322 | return status; |
1da177e4 LT |
323 | } |
324 | ||
c45aac43 AS |
325 | /* |
326 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
327 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
328 | */ | |
329 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
330 | { | |
331 | u8 d; | |
00eb43a1 | 332 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
333 | } |
334 | ||
335 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
336 | { | |
00eb43a1 | 337 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
338 | } |
339 | ||
6ccedb10 | 340 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
341 | { |
342 | int result; | |
343 | u8 d; | |
344 | ||
345 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 346 | &address, 1, &d, 1, 0); |
3576cf61 DS |
347 | *data = d; |
348 | return result; | |
349 | } | |
6ffb221a | 350 | |
3576cf61 DS |
351 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
352 | { | |
6ccedb10 AS |
353 | u8 wdata[2] = { address, data }; |
354 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 355 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
356 | } |
357 | ||
1da177e4 LT |
358 | /* |
359 | * Externally callable EC access functions. For now, assume 1 EC only | |
360 | */ | |
c45aac43 AS |
361 | int ec_burst_enable(void) |
362 | { | |
c45aac43 AS |
363 | if (!first_ec) |
364 | return -ENODEV; | |
d033879c | 365 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
366 | } |
367 | ||
368 | EXPORT_SYMBOL(ec_burst_enable); | |
369 | ||
370 | int ec_burst_disable(void) | |
371 | { | |
c45aac43 AS |
372 | if (!first_ec) |
373 | return -ENODEV; | |
d033879c | 374 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
375 | } |
376 | ||
377 | EXPORT_SYMBOL(ec_burst_disable); | |
378 | ||
6ccedb10 | 379 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 380 | { |
1da177e4 | 381 | int err; |
6ffb221a | 382 | u8 temp_data; |
1da177e4 LT |
383 | |
384 | if (!first_ec) | |
385 | return -ENODEV; | |
386 | ||
d033879c | 387 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
388 | |
389 | if (!err) { | |
390 | *val = temp_data; | |
391 | return 0; | |
50526df6 | 392 | } else |
1da177e4 LT |
393 | return err; |
394 | } | |
50526df6 | 395 | |
1da177e4 LT |
396 | EXPORT_SYMBOL(ec_read); |
397 | ||
50526df6 | 398 | int ec_write(u8 addr, u8 val) |
1da177e4 | 399 | { |
1da177e4 LT |
400 | int err; |
401 | ||
402 | if (!first_ec) | |
403 | return -ENODEV; | |
404 | ||
d033879c | 405 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
406 | |
407 | return err; | |
408 | } | |
50526df6 | 409 | |
1da177e4 LT |
410 | EXPORT_SYMBOL(ec_write); |
411 | ||
616362de | 412 | int ec_transaction(u8 command, |
9e197219 | 413 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
414 | u8 * rdata, unsigned rdata_len, |
415 | int force_poll) | |
45bea155 | 416 | { |
d7a76e4c LP |
417 | if (!first_ec) |
418 | return -ENODEV; | |
45bea155 | 419 | |
d033879c | 420 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
421 | wdata_len, rdata, rdata_len, |
422 | force_poll); | |
45bea155 | 423 | } |
1da177e4 | 424 | |
ab9e43c6 LP |
425 | EXPORT_SYMBOL(ec_transaction); |
426 | ||
6ccedb10 | 427 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
428 | { |
429 | int result; | |
6ccedb10 | 430 | u8 d; |
1da177e4 | 431 | |
6ccedb10 AS |
432 | if (!ec || !data) |
433 | return -EINVAL; | |
1da177e4 | 434 | |
6ccedb10 AS |
435 | /* |
436 | * Query the EC to find out which _Qxx method we need to evaluate. | |
437 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
438 | * bit to be cleared (and thus clearing the interrupt source). | |
439 | */ | |
716e084e | 440 | |
00eb43a1 | 441 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
442 | if (result) |
443 | return result; | |
1da177e4 | 444 | |
6ccedb10 AS |
445 | if (!d) |
446 | return -ENODATA; | |
1da177e4 | 447 | |
6ccedb10 AS |
448 | *data = d; |
449 | return 0; | |
1da177e4 LT |
450 | } |
451 | ||
1da177e4 LT |
452 | /* -------------------------------------------------------------------------- |
453 | Event Management | |
454 | -------------------------------------------------------------------------- */ | |
837012ed AS |
455 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
456 | acpi_handle handle, acpi_ec_query_func func, | |
457 | void *data) | |
458 | { | |
459 | struct acpi_ec_query_handler *handler = | |
460 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
461 | if (!handler) | |
462 | return -ENOMEM; | |
463 | ||
464 | handler->query_bit = query_bit; | |
465 | handler->handle = handle; | |
466 | handler->func = func; | |
467 | handler->data = data; | |
468 | mutex_lock(&ec->lock); | |
30c08574 | 469 | list_add(&handler->node, &ec->list); |
837012ed AS |
470 | mutex_unlock(&ec->lock); |
471 | return 0; | |
472 | } | |
473 | ||
474 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
475 | ||
476 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
477 | { | |
1544fdbc | 478 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 479 | mutex_lock(&ec->lock); |
1544fdbc | 480 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
481 | if (query_bit == handler->query_bit) { |
482 | list_del(&handler->node); | |
483 | kfree(handler); | |
837012ed AS |
484 | } |
485 | } | |
486 | mutex_unlock(&ec->lock); | |
487 | } | |
488 | ||
489 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 490 | |
50526df6 | 491 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 492 | { |
3d02b90b | 493 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 494 | u8 value = 0; |
837012ed | 495 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 496 | |
5d0c288b | 497 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 498 | return; |
837012ed AS |
499 | mutex_lock(&ec->lock); |
500 | list_for_each_entry(handler, &ec->list, node) { | |
501 | if (value == handler->query_bit) { | |
502 | /* have custom handler for this bit */ | |
503 | memcpy(©, handler, sizeof(copy)); | |
504 | mutex_unlock(&ec->lock); | |
505 | if (copy.func) { | |
506 | copy.func(copy.data); | |
507 | } else if (copy.handle) { | |
508 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
509 | } | |
510 | return; | |
511 | } | |
512 | } | |
513 | mutex_unlock(&ec->lock); | |
45bea155 | 514 | } |
1da177e4 | 515 | |
50526df6 | 516 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 517 | { |
50526df6 | 518 | acpi_status status = AE_OK; |
3d02b90b | 519 | struct acpi_ec *ec = data; |
00eb43a1 | 520 | |
3ebe08a7 | 521 | pr_debug(PREFIX "~~~> interrupt\n"); |
080e412c | 522 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
7843932a | 523 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) |
af3fd140 | 524 | wake_up(&ec->wait); |
451566f4 | 525 | |
080e412c AS |
526 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { |
527 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
528 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, | |
529 | acpi_ec_gpe_query, ec); | |
95b937e3 AS |
530 | } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { |
531 | /* this is non-query, must be confirmation */ | |
3ebe08a7 MN |
532 | if (printk_ratelimit()) |
533 | pr_info(PREFIX "non-query interrupt received," | |
534 | " switching to interrupt mode\n"); | |
7843932a | 535 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 536 | } |
e41334c0 | 537 | |
7843932a | 538 | return ACPI_SUCCESS(status) ? |
50526df6 | 539 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
540 | } |
541 | ||
542 | /* -------------------------------------------------------------------------- | |
543 | Address Space Management | |
544 | -------------------------------------------------------------------------- */ | |
545 | ||
546 | static acpi_status | |
50526df6 LB |
547 | acpi_ec_space_setup(acpi_handle region_handle, |
548 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
549 | { |
550 | /* | |
551 | * The EC object is in the handler context and is needed | |
552 | * when calling the acpi_ec_space_handler. | |
553 | */ | |
50526df6 LB |
554 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
555 | handler_context : NULL; | |
1da177e4 LT |
556 | |
557 | return AE_OK; | |
558 | } | |
559 | ||
1da177e4 | 560 | static acpi_status |
5b7734b4 AS |
561 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
562 | u32 bits, acpi_integer *value, | |
50526df6 | 563 | void *handler_context, void *region_context) |
1da177e4 | 564 | { |
3d02b90b | 565 | struct acpi_ec *ec = handler_context; |
5b7734b4 AS |
566 | int result = 0, i = 0; |
567 | u8 temp = 0; | |
1da177e4 | 568 | |
1da177e4 | 569 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 570 | return AE_BAD_PARAMETER; |
1da177e4 | 571 | |
5b7734b4 | 572 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 573 | return AE_BAD_PARAMETER; |
1da177e4 | 574 | |
5b7734b4 AS |
575 | if (bits != 8 && acpi_strict) |
576 | return AE_BAD_PARAMETER; | |
1da177e4 | 577 | |
5b7734b4 AS |
578 | while (bits - i > 0) { |
579 | if (function == ACPI_READ) { | |
580 | result = acpi_ec_read(ec, address, &temp); | |
581 | (*value) |= ((acpi_integer)temp) << i; | |
582 | } else { | |
583 | temp = 0xff & ((*value) >> i); | |
584 | result = acpi_ec_write(ec, address, temp); | |
585 | } | |
586 | i += 8; | |
587 | ++address; | |
1da177e4 LT |
588 | } |
589 | ||
1da177e4 LT |
590 | switch (result) { |
591 | case -EINVAL: | |
d550d98d | 592 | return AE_BAD_PARAMETER; |
1da177e4 LT |
593 | break; |
594 | case -ENODEV: | |
d550d98d | 595 | return AE_NOT_FOUND; |
1da177e4 LT |
596 | break; |
597 | case -ETIME: | |
d550d98d | 598 | return AE_TIME; |
1da177e4 LT |
599 | break; |
600 | default: | |
d550d98d | 601 | return AE_OK; |
1da177e4 | 602 | } |
1da177e4 LT |
603 | } |
604 | ||
1da177e4 LT |
605 | /* -------------------------------------------------------------------------- |
606 | FS Interface (/proc) | |
607 | -------------------------------------------------------------------------- */ | |
608 | ||
50526df6 | 609 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 610 | |
50526df6 | 611 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 612 | { |
3d02b90b | 613 | struct acpi_ec *ec = seq->private; |
1da177e4 | 614 | |
1da177e4 LT |
615 | if (!ec) |
616 | goto end; | |
617 | ||
01f22462 AS |
618 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
619 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
620 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
621 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 622 | ec->global_lock ? "yes" : "no"); |
50526df6 | 623 | end: |
d550d98d | 624 | return 0; |
1da177e4 LT |
625 | } |
626 | ||
627 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
628 | { | |
629 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
630 | } | |
631 | ||
703959d4 | 632 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
633 | .open = acpi_ec_info_open_fs, |
634 | .read = seq_read, | |
635 | .llseek = seq_lseek, | |
636 | .release = single_release, | |
1da177e4 LT |
637 | .owner = THIS_MODULE, |
638 | }; | |
639 | ||
50526df6 | 640 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 641 | { |
50526df6 | 642 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 643 | |
1da177e4 LT |
644 | if (!acpi_device_dir(device)) { |
645 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 646 | acpi_ec_dir); |
1da177e4 | 647 | if (!acpi_device_dir(device)) |
d550d98d | 648 | return -ENODEV; |
1da177e4 LT |
649 | } |
650 | ||
651 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 652 | acpi_device_dir(device)); |
1da177e4 | 653 | if (!entry) |
d550d98d | 654 | return -ENODEV; |
1da177e4 LT |
655 | else { |
656 | entry->proc_fops = &acpi_ec_info_ops; | |
657 | entry->data = acpi_driver_data(device); | |
658 | entry->owner = THIS_MODULE; | |
659 | } | |
660 | ||
d550d98d | 661 | return 0; |
1da177e4 LT |
662 | } |
663 | ||
50526df6 | 664 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 665 | { |
1da177e4 LT |
666 | |
667 | if (acpi_device_dir(device)) { | |
668 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
669 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
670 | acpi_device_dir(device) = NULL; | |
671 | } | |
672 | ||
d550d98d | 673 | return 0; |
1da177e4 LT |
674 | } |
675 | ||
1da177e4 LT |
676 | /* -------------------------------------------------------------------------- |
677 | Driver Interface | |
678 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
679 | static acpi_status |
680 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
681 | ||
c0900c35 AS |
682 | static struct acpi_ec *make_acpi_ec(void) |
683 | { | |
684 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
685 | if (!ec) | |
686 | return NULL; | |
080e412c | 687 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
688 | mutex_init(&ec->lock); |
689 | init_waitqueue_head(&ec->wait); | |
837012ed | 690 | INIT_LIST_HEAD(&ec->list); |
c0900c35 AS |
691 | return ec; |
692 | } | |
837012ed | 693 | |
c019b193 AS |
694 | static acpi_status |
695 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
696 | void *context, void **return_value) | |
697 | { | |
698 | struct acpi_namespace_node *node = handle; | |
699 | struct acpi_ec *ec = context; | |
700 | int value = 0; | |
701 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
702 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
703 | } | |
704 | return AE_OK; | |
705 | } | |
706 | ||
cd8c93a4 AS |
707 | static acpi_status |
708 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 709 | { |
cd8c93a4 AS |
710 | acpi_status status; |
711 | ||
712 | struct acpi_ec *ec = context; | |
713 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
714 | ec_parse_io_ports, ec); | |
715 | if (ACPI_FAILURE(status)) | |
716 | return status; | |
837012ed AS |
717 | |
718 | /* Get GPE bit assignment (EC events). */ | |
719 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
720 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
721 | if (ACPI_FAILURE(status)) | |
722 | return status; | |
c019b193 AS |
723 | /* Find and register all query methods */ |
724 | acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, | |
725 | acpi_ec_register_query_methods, ec, NULL); | |
837012ed AS |
726 | /* Use the global lock for all EC transactions? */ |
727 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 728 | ec->handle = handle; |
cd8c93a4 | 729 | return AE_CTRL_TERMINATE; |
837012ed AS |
730 | } |
731 | ||
4c611060 AS |
732 | static void ec_remove_handlers(struct acpi_ec *ec) |
733 | { | |
734 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
735 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 736 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
737 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
738 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 739 | pr_err(PREFIX "failed to remove gpe handler\n"); |
4c611060 AS |
740 | ec->handlers_installed = 0; |
741 | } | |
742 | ||
703959d4 | 743 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 744 | { |
703959d4 | 745 | struct acpi_ec *ec = NULL; |
45bea155 | 746 | |
45bea155 | 747 | if (!device) |
d550d98d | 748 | return -EINVAL; |
c0900c35 AS |
749 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
750 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
751 | ||
4c611060 AS |
752 | /* Check for boot EC */ |
753 | if (boot_ec) { | |
754 | if (boot_ec->handle == device->handle) { | |
755 | /* Pre-loaded EC from DSDT, just move pointer */ | |
756 | ec = boot_ec; | |
757 | boot_ec = NULL; | |
758 | goto end; | |
759 | } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { | |
760 | /* ECDT-based EC, time to shut it down */ | |
761 | ec_remove_handlers(boot_ec); | |
762 | kfree(boot_ec); | |
763 | first_ec = boot_ec = NULL; | |
764 | } | |
765 | } | |
766 | ||
c0900c35 | 767 | ec = make_acpi_ec(); |
45bea155 | 768 | if (!ec) |
d550d98d | 769 | return -ENOMEM; |
703959d4 | 770 | |
cd8c93a4 AS |
771 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
772 | AE_CTRL_TERMINATE) { | |
c0900c35 AS |
773 | kfree(ec); |
774 | return -EINVAL; | |
45bea155 | 775 | } |
c0900c35 | 776 | ec->handle = device->handle; |
4c611060 AS |
777 | end: |
778 | if (!first_ec) | |
779 | first_ec = ec; | |
c0900c35 | 780 | acpi_driver_data(device) = ec; |
c0900c35 | 781 | acpi_ec_add_fs(device); |
3ebe08a7 | 782 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 783 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 784 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 785 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 786 | return 0; |
1da177e4 LT |
787 | } |
788 | ||
50526df6 | 789 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 790 | { |
01f22462 | 791 | struct acpi_ec *ec; |
07ddf768 | 792 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 793 | |
1da177e4 | 794 | if (!device) |
d550d98d | 795 | return -EINVAL; |
1da177e4 LT |
796 | |
797 | ec = acpi_driver_data(device); | |
837012ed | 798 | mutex_lock(&ec->lock); |
07ddf768 | 799 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
800 | list_del(&handler->node); |
801 | kfree(handler); | |
802 | } | |
803 | mutex_unlock(&ec->lock); | |
1da177e4 | 804 | acpi_ec_remove_fs(device); |
c0900c35 | 805 | acpi_driver_data(device) = NULL; |
d033879c | 806 | if (ec == first_ec) |
c0900c35 | 807 | first_ec = NULL; |
4c611060 | 808 | kfree(ec); |
d550d98d | 809 | return 0; |
1da177e4 LT |
810 | } |
811 | ||
1da177e4 | 812 | static acpi_status |
c0900c35 | 813 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 814 | { |
3d02b90b | 815 | struct acpi_ec *ec = context; |
1da177e4 | 816 | |
01f22462 | 817 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 818 | return AE_OK; |
1da177e4 LT |
819 | |
820 | /* | |
821 | * The first address region returned is the data port, and | |
822 | * the second address region returned is the status/command | |
823 | * port. | |
824 | */ | |
01f22462 | 825 | if (ec->data_addr == 0) |
6ffb221a | 826 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 827 | else if (ec->command_addr == 0) |
6ffb221a | 828 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 829 | else |
1da177e4 | 830 | return AE_CTRL_TERMINATE; |
1da177e4 | 831 | |
1da177e4 LT |
832 | return AE_OK; |
833 | } | |
834 | ||
e8284321 AS |
835 | static int ec_install_handlers(struct acpi_ec *ec) |
836 | { | |
c0900c35 | 837 | acpi_status status; |
4c611060 AS |
838 | if (ec->handlers_installed) |
839 | return 0; | |
c0900c35 AS |
840 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
841 | ACPI_GPE_EDGE_TRIGGERED, | |
842 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
843 | if (ACPI_FAILURE(status)) |
844 | return -ENODEV; | |
01f22462 | 845 | |
e8284321 AS |
846 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
847 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
848 | ||
849 | status = acpi_install_address_space_handler(ec->handle, | |
850 | ACPI_ADR_SPACE_EC, | |
851 | &acpi_ec_space_handler, | |
852 | &acpi_ec_space_setup, ec); | |
853 | if (ACPI_FAILURE(status)) { | |
854 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
855 | return -ENODEV; | |
856 | } | |
857 | ||
4c611060 | 858 | ec->handlers_installed = 1; |
e8284321 AS |
859 | return 0; |
860 | } | |
861 | ||
50526df6 | 862 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 863 | { |
c0900c35 | 864 | struct acpi_ec *ec; |
837012ed | 865 | int ret = 0; |
1da177e4 | 866 | |
1da177e4 | 867 | if (!device) |
d550d98d | 868 | return -EINVAL; |
1da177e4 LT |
869 | |
870 | ec = acpi_driver_data(device); | |
871 | ||
872 | if (!ec) | |
d550d98d | 873 | return -EINVAL; |
1da177e4 | 874 | |
4c611060 | 875 | ret = ec_install_handlers(ec); |
837012ed AS |
876 | |
877 | /* EC is fully operational, allow queries */ | |
080e412c | 878 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 879 | return ret; |
1da177e4 LT |
880 | } |
881 | ||
50526df6 | 882 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 883 | { |
c0900c35 | 884 | struct acpi_ec *ec; |
1da177e4 | 885 | if (!device) |
d550d98d | 886 | return -EINVAL; |
1da177e4 | 887 | ec = acpi_driver_data(device); |
c0900c35 AS |
888 | if (!ec) |
889 | return -EINVAL; | |
4c611060 | 890 | ec_remove_handlers(ec); |
f9319f90 | 891 | |
d550d98d | 892 | return 0; |
1da177e4 LT |
893 | } |
894 | ||
c0900c35 AS |
895 | int __init acpi_ec_ecdt_probe(void) |
896 | { | |
897 | int ret; | |
898 | acpi_status status; | |
50526df6 | 899 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 900 | |
d66d969d AS |
901 | boot_ec = make_acpi_ec(); |
902 | if (!boot_ec) | |
c0900c35 AS |
903 | return -ENOMEM; |
904 | /* | |
905 | * Generate a boot ec context | |
906 | */ | |
15a58ed1 AS |
907 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
908 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 909 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 910 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
911 | boot_ec->command_addr = ecdt_ptr->control.address; |
912 | boot_ec->data_addr = ecdt_ptr->data.address; | |
913 | boot_ec->gpe = ecdt_ptr->gpe; | |
914 | boot_ec->handle = ACPI_ROOT_OBJECT; | |
915 | } else { | |
5870a8cd AS |
916 | /* This workaround is needed only on some broken machines, |
917 | * which require early EC, but fail to provide ECDT */ | |
918 | acpi_handle x; | |
cd8c93a4 AS |
919 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
920 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
921 | boot_ec, NULL); | |
2d8348b4 AS |
922 | /* Check that acpi_get_devices actually find something */ |
923 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 924 | goto error; |
5870a8cd AS |
925 | /* We really need to limit this workaround, the only ASUS, |
926 | * which needs it, has fake EC._INI method, so use it as flag. | |
927 | */ | |
928 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
929 | goto error; | |
cd8c93a4 | 930 | } |
1da177e4 | 931 | |
d66d969d | 932 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
933 | if (!ret) { |
934 | first_ec = boot_ec; | |
e8284321 | 935 | return 0; |
d033879c | 936 | } |
c0900c35 | 937 | error: |
d66d969d AS |
938 | kfree(boot_ec); |
939 | boot_ec = NULL; | |
1da177e4 LT |
940 | return -ENODEV; |
941 | } | |
942 | ||
50526df6 | 943 | static int __init acpi_ec_init(void) |
1da177e4 | 944 | { |
50526df6 | 945 | int result = 0; |
1da177e4 | 946 | |
1da177e4 | 947 | if (acpi_disabled) |
d550d98d | 948 | return 0; |
1da177e4 LT |
949 | |
950 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
951 | if (!acpi_ec_dir) | |
d550d98d | 952 | return -ENODEV; |
1da177e4 LT |
953 | |
954 | /* Now register the driver for the EC */ | |
955 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
956 | if (result < 0) { | |
957 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 958 | return -ENODEV; |
1da177e4 LT |
959 | } |
960 | ||
d550d98d | 961 | return result; |
1da177e4 LT |
962 | } |
963 | ||
964 | subsys_initcall(acpi_ec_init); | |
965 | ||
966 | /* EC driver currently not unloadable */ | |
967 | #if 0 | |
50526df6 | 968 | static void __exit acpi_ec_exit(void) |
1da177e4 | 969 | { |
1da177e4 LT |
970 | |
971 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
972 | ||
973 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
974 | ||
d550d98d | 975 | return; |
1da177e4 | 976 | } |
7843932a | 977 | #endif /* 0 */ |