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 */ |
0af2f653 | 81 | EC_FLAGS_ONLY_IBF_GPE, /* Expect GPE only for IBF = 0 event */ |
080e412c AS |
82 | }; |
83 | ||
50526df6 LB |
84 | static int acpi_ec_remove(struct acpi_device *device, int type); |
85 | static int acpi_ec_start(struct acpi_device *device); | |
86 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 87 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 | 88 | |
1ba90e3a TR |
89 | static const struct acpi_device_id ec_device_ids[] = { |
90 | {"PNP0C09", 0}, | |
91 | {"", 0}, | |
92 | }; | |
93 | ||
1da177e4 | 94 | static struct acpi_driver acpi_ec_driver = { |
c2b6705b | 95 | .name = "ec", |
50526df6 | 96 | .class = ACPI_EC_CLASS, |
1ba90e3a | 97 | .ids = ec_device_ids, |
50526df6 | 98 | .ops = { |
703959d4 | 99 | .add = acpi_ec_add, |
50526df6 LB |
100 | .remove = acpi_ec_remove, |
101 | .start = acpi_ec_start, | |
102 | .stop = acpi_ec_stop, | |
103 | }, | |
1da177e4 | 104 | }; |
6ffb221a DS |
105 | |
106 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 107 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
108 | typedef int (*acpi_ec_query_func) (void *data); |
109 | ||
110 | struct acpi_ec_query_handler { | |
111 | struct list_head node; | |
112 | acpi_ec_query_func func; | |
113 | acpi_handle handle; | |
114 | void *data; | |
115 | u8 query_bit; | |
116 | }; | |
117 | ||
a854e08a | 118 | static struct acpi_ec { |
703959d4 | 119 | acpi_handle handle; |
a86e2772 | 120 | unsigned long gpe; |
6ffb221a DS |
121 | unsigned long command_addr; |
122 | unsigned long data_addr; | |
703959d4 | 123 | unsigned long global_lock; |
080e412c | 124 | unsigned long flags; |
c787a855 | 125 | struct mutex lock; |
703959d4 | 126 | wait_queue_head_t wait; |
837012ed | 127 | struct list_head list; |
4c611060 | 128 | u8 handlers_installed; |
d033879c | 129 | } *boot_ec, *first_ec; |
703959d4 | 130 | |
1da177e4 LT |
131 | /* -------------------------------------------------------------------------- |
132 | Transaction Management | |
133 | -------------------------------------------------------------------------- */ | |
134 | ||
6ffb221a | 135 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 136 | { |
3ebe08a7 MN |
137 | u8 x = inb(ec->command_addr); |
138 | pr_debug(PREFIX "---> status = 0x%2x\n", x); | |
139 | return x; | |
451566f4 DT |
140 | } |
141 | ||
6ffb221a | 142 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 143 | { |
3ebe08a7 MN |
144 | u8 x = inb(ec->data_addr); |
145 | pr_debug(PREFIX "---> data = 0x%2x\n", x); | |
6ffb221a | 146 | return inb(ec->data_addr); |
7c6db5e5 DS |
147 | } |
148 | ||
6ffb221a | 149 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 150 | { |
3ebe08a7 | 151 | pr_debug(PREFIX "<--- command = 0x%2x\n", command); |
6ffb221a | 152 | outb(command, ec->command_addr); |
45bea155 LY |
153 | } |
154 | ||
6ffb221a | 155 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 156 | { |
3ebe08a7 | 157 | pr_debug(PREFIX "<--- data = 0x%2x\n", data); |
6ffb221a | 158 | outb(data, ec->data_addr); |
703959d4 | 159 | } |
45bea155 | 160 | |
080e412c | 161 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 162 | { |
080e412c | 163 | if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags)) |
9e197219 | 164 | return 0; |
78d0af33 | 165 | if (event == ACPI_EC_EVENT_OBF_1) { |
080e412c | 166 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
703959d4 | 167 | return 1; |
78d0af33 | 168 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
080e412c | 169 | if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) |
703959d4 | 170 | return 1; |
45bea155 LY |
171 | } |
172 | ||
703959d4 | 173 | return 0; |
45bea155 | 174 | } |
451566f4 | 175 | |
080e412c | 176 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) |
7c6db5e5 | 177 | { |
7843932a AS |
178 | if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && |
179 | likely(!force_poll)) { | |
080e412c AS |
180 | if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), |
181 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
0af2f653 | 182 | return 0; |
080e412c AS |
183 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
184 | if (acpi_ec_check_status(ec, event)) { | |
0af2f653 LB |
185 | if (event == ACPI_EC_EVENT_OBF_1) { |
186 | /* miss OBF = 1 GPE, don't expect it anymore */ | |
3ebe08a7 | 187 | pr_info(PREFIX "missing OBF_1 confirmation," |
0af2f653 LB |
188 | "switching to degraded mode.\n"); |
189 | set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags); | |
95b937e3 | 190 | } else { |
66c5f4e7 | 191 | /* missing GPEs, switch back to poll mode */ |
3ebe08a7 MN |
192 | if (printk_ratelimit()) |
193 | pr_info(PREFIX "missing IBF_1 confirmations," | |
194 | "switch off interrupt mode.\n"); | |
66c5f4e7 | 195 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 196 | } |
0af2f653 | 197 | return 0; |
703959d4 | 198 | } |
7843932a AS |
199 | } else { |
200 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
201 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
202 | while (time_before(jiffies, delay)) { | |
203 | if (acpi_ec_check_status(ec, event)) | |
0af2f653 | 204 | return 0; |
7843932a | 205 | } |
af3fd140 | 206 | } |
3ebe08a7 | 207 | pr_err(PREFIX "acpi_ec_wait timeout," |
080e412c AS |
208 | " status = %d, expect_event = %d\n", |
209 | acpi_ec_read_status(ec), event); | |
0af2f653 | 210 | return -ETIME; |
1da177e4 LT |
211 | } |
212 | ||
703959d4 | 213 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 214 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
215 | u8 * rdata, unsigned rdata_len, |
216 | int force_poll) | |
45bea155 | 217 | { |
af3fd140 | 218 | int result = 0; |
080e412c | 219 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 220 | acpi_ec_write_cmd(ec, command); |
3ebe08a7 | 221 | pr_debug(PREFIX "transaction start\n"); |
78d0af33 | 222 | for (; wdata_len > 0; --wdata_len) { |
080e412c | 223 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 224 | if (result) { |
3ebe08a7 | 225 | pr_err(PREFIX |
6ccedb10 | 226 | "write_cmd timeout, command = %d\n", command); |
af3fd140 AS |
227 | goto end; |
228 | } | |
080e412c | 229 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 230 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 231 | } |
45bea155 | 232 | |
d91df1aa | 233 | if (!rdata_len) { |
080e412c | 234 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 235 | if (result) { |
3ebe08a7 | 236 | pr_err(PREFIX |
6ccedb10 | 237 | "finish-write timeout, command = %d\n", command); |
af3fd140 AS |
238 | goto end; |
239 | } | |
080e412c AS |
240 | } else if (command == ACPI_EC_COMMAND_QUERY) |
241 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
45bea155 | 242 | |
78d0af33 | 243 | for (; rdata_len > 0; --rdata_len) { |
0af2f653 LB |
244 | if (test_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags)) |
245 | force_poll = 1; | |
080e412c | 246 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); |
af3fd140 | 247 | if (result) { |
3ebe08a7 | 248 | pr_err(PREFIX "read timeout, command = %d\n", command); |
af3fd140 AS |
249 | goto end; |
250 | } | |
0c5d31f4 AS |
251 | /* Don't expect GPE after last read */ |
252 | if (rdata_len > 1) | |
253 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
6ffb221a | 254 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 255 | } |
af3fd140 | 256 | end: |
3ebe08a7 | 257 | pr_debug(PREFIX "transaction end\n"); |
af3fd140 | 258 | return result; |
45bea155 LY |
259 | } |
260 | ||
3576cf61 | 261 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 262 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
263 | u8 * rdata, unsigned rdata_len, |
264 | int force_poll) | |
1da177e4 | 265 | { |
d7a76e4c | 266 | int status; |
50526df6 | 267 | u32 glk; |
1da177e4 | 268 | |
d7a76e4c | 269 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 270 | return -EINVAL; |
1da177e4 | 271 | |
6ccedb10 AS |
272 | if (rdata) |
273 | memset(rdata, 0, rdata_len); | |
1da177e4 | 274 | |
523953b4 | 275 | mutex_lock(&ec->lock); |
703959d4 | 276 | if (ec->global_lock) { |
1da177e4 | 277 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
278 | if (ACPI_FAILURE(status)) { |
279 | mutex_unlock(&ec->lock); | |
d550d98d | 280 | return -ENODEV; |
c24e912b | 281 | } |
1da177e4 | 282 | } |
451566f4 | 283 | |
080e412c | 284 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 285 | if (status) { |
3ebe08a7 MN |
286 | pr_err(PREFIX "input buffer is not empty, " |
287 | "aborting transaction\n"); | |
451566f4 | 288 | goto end; |
716e084e | 289 | } |
1da177e4 | 290 | |
6ccedb10 AS |
291 | status = acpi_ec_transaction_unlocked(ec, command, |
292 | wdata, wdata_len, | |
00eb43a1 LP |
293 | rdata, rdata_len, |
294 | force_poll); | |
1da177e4 | 295 | |
6ccedb10 | 296 | end: |
1da177e4 | 297 | |
703959d4 | 298 | if (ec->global_lock) |
1da177e4 | 299 | acpi_release_global_lock(glk); |
523953b4 | 300 | mutex_unlock(&ec->lock); |
1da177e4 | 301 | |
d550d98d | 302 | return status; |
1da177e4 LT |
303 | } |
304 | ||
c45aac43 AS |
305 | /* |
306 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
307 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
308 | */ | |
309 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
310 | { | |
311 | u8 d; | |
00eb43a1 | 312 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
313 | } |
314 | ||
315 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
316 | { | |
00eb43a1 | 317 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
318 | } |
319 | ||
6ccedb10 | 320 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
321 | { |
322 | int result; | |
323 | u8 d; | |
324 | ||
325 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 326 | &address, 1, &d, 1, 0); |
3576cf61 DS |
327 | *data = d; |
328 | return result; | |
329 | } | |
6ffb221a | 330 | |
3576cf61 DS |
331 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
332 | { | |
6ccedb10 AS |
333 | u8 wdata[2] = { address, data }; |
334 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 335 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
336 | } |
337 | ||
1da177e4 LT |
338 | /* |
339 | * Externally callable EC access functions. For now, assume 1 EC only | |
340 | */ | |
c45aac43 AS |
341 | int ec_burst_enable(void) |
342 | { | |
c45aac43 AS |
343 | if (!first_ec) |
344 | return -ENODEV; | |
d033879c | 345 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
346 | } |
347 | ||
348 | EXPORT_SYMBOL(ec_burst_enable); | |
349 | ||
350 | int ec_burst_disable(void) | |
351 | { | |
c45aac43 AS |
352 | if (!first_ec) |
353 | return -ENODEV; | |
d033879c | 354 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
355 | } |
356 | ||
357 | EXPORT_SYMBOL(ec_burst_disable); | |
358 | ||
6ccedb10 | 359 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 360 | { |
1da177e4 | 361 | int err; |
6ffb221a | 362 | u8 temp_data; |
1da177e4 LT |
363 | |
364 | if (!first_ec) | |
365 | return -ENODEV; | |
366 | ||
d033879c | 367 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
368 | |
369 | if (!err) { | |
370 | *val = temp_data; | |
371 | return 0; | |
50526df6 | 372 | } else |
1da177e4 LT |
373 | return err; |
374 | } | |
50526df6 | 375 | |
1da177e4 LT |
376 | EXPORT_SYMBOL(ec_read); |
377 | ||
50526df6 | 378 | int ec_write(u8 addr, u8 val) |
1da177e4 | 379 | { |
1da177e4 LT |
380 | int err; |
381 | ||
382 | if (!first_ec) | |
383 | return -ENODEV; | |
384 | ||
d033879c | 385 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
386 | |
387 | return err; | |
388 | } | |
50526df6 | 389 | |
1da177e4 LT |
390 | EXPORT_SYMBOL(ec_write); |
391 | ||
616362de | 392 | int ec_transaction(u8 command, |
9e197219 | 393 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
394 | u8 * rdata, unsigned rdata_len, |
395 | int force_poll) | |
45bea155 | 396 | { |
d7a76e4c LP |
397 | if (!first_ec) |
398 | return -ENODEV; | |
45bea155 | 399 | |
d033879c | 400 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
401 | wdata_len, rdata, rdata_len, |
402 | force_poll); | |
45bea155 | 403 | } |
1da177e4 | 404 | |
ab9e43c6 LP |
405 | EXPORT_SYMBOL(ec_transaction); |
406 | ||
6ccedb10 | 407 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
408 | { |
409 | int result; | |
6ccedb10 | 410 | u8 d; |
1da177e4 | 411 | |
6ccedb10 AS |
412 | if (!ec || !data) |
413 | return -EINVAL; | |
1da177e4 | 414 | |
6ccedb10 AS |
415 | /* |
416 | * Query the EC to find out which _Qxx method we need to evaluate. | |
417 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
418 | * bit to be cleared (and thus clearing the interrupt source). | |
419 | */ | |
716e084e | 420 | |
00eb43a1 | 421 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
422 | if (result) |
423 | return result; | |
1da177e4 | 424 | |
6ccedb10 AS |
425 | if (!d) |
426 | return -ENODATA; | |
1da177e4 | 427 | |
6ccedb10 AS |
428 | *data = d; |
429 | return 0; | |
1da177e4 LT |
430 | } |
431 | ||
1da177e4 LT |
432 | /* -------------------------------------------------------------------------- |
433 | Event Management | |
434 | -------------------------------------------------------------------------- */ | |
837012ed AS |
435 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
436 | acpi_handle handle, acpi_ec_query_func func, | |
437 | void *data) | |
438 | { | |
439 | struct acpi_ec_query_handler *handler = | |
440 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
441 | if (!handler) | |
442 | return -ENOMEM; | |
443 | ||
444 | handler->query_bit = query_bit; | |
445 | handler->handle = handle; | |
446 | handler->func = func; | |
447 | handler->data = data; | |
448 | mutex_lock(&ec->lock); | |
30c08574 | 449 | list_add(&handler->node, &ec->list); |
837012ed AS |
450 | mutex_unlock(&ec->lock); |
451 | return 0; | |
452 | } | |
453 | ||
454 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
455 | ||
456 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
457 | { | |
1544fdbc | 458 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 459 | mutex_lock(&ec->lock); |
1544fdbc | 460 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
461 | if (query_bit == handler->query_bit) { |
462 | list_del(&handler->node); | |
463 | kfree(handler); | |
837012ed AS |
464 | } |
465 | } | |
466 | mutex_unlock(&ec->lock); | |
467 | } | |
468 | ||
469 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 470 | |
50526df6 | 471 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 472 | { |
3d02b90b | 473 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 474 | u8 value = 0; |
837012ed | 475 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 476 | |
5d0c288b | 477 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 478 | return; |
837012ed AS |
479 | mutex_lock(&ec->lock); |
480 | list_for_each_entry(handler, &ec->list, node) { | |
481 | if (value == handler->query_bit) { | |
482 | /* have custom handler for this bit */ | |
483 | memcpy(©, handler, sizeof(copy)); | |
484 | mutex_unlock(&ec->lock); | |
485 | if (copy.func) { | |
486 | copy.func(copy.data); | |
487 | } else if (copy.handle) { | |
488 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
489 | } | |
490 | return; | |
491 | } | |
492 | } | |
493 | mutex_unlock(&ec->lock); | |
45bea155 | 494 | } |
1da177e4 | 495 | |
50526df6 | 496 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 497 | { |
50526df6 | 498 | acpi_status status = AE_OK; |
3d02b90b | 499 | struct acpi_ec *ec = data; |
00eb43a1 | 500 | |
3ebe08a7 | 501 | pr_debug(PREFIX "~~~> interrupt\n"); |
080e412c | 502 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
7843932a | 503 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) |
af3fd140 | 504 | wake_up(&ec->wait); |
451566f4 | 505 | |
080e412c AS |
506 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { |
507 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
508 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, | |
509 | acpi_ec_gpe_query, ec); | |
95b937e3 AS |
510 | } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { |
511 | /* this is non-query, must be confirmation */ | |
3ebe08a7 MN |
512 | if (printk_ratelimit()) |
513 | pr_info(PREFIX "non-query interrupt received," | |
514 | " switching to interrupt mode\n"); | |
7843932a | 515 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 516 | } |
e41334c0 | 517 | |
7843932a | 518 | return ACPI_SUCCESS(status) ? |
50526df6 | 519 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
520 | } |
521 | ||
522 | /* -------------------------------------------------------------------------- | |
523 | Address Space Management | |
524 | -------------------------------------------------------------------------- */ | |
525 | ||
526 | static acpi_status | |
50526df6 LB |
527 | acpi_ec_space_setup(acpi_handle region_handle, |
528 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
529 | { |
530 | /* | |
531 | * The EC object is in the handler context and is needed | |
532 | * when calling the acpi_ec_space_handler. | |
533 | */ | |
50526df6 LB |
534 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
535 | handler_context : NULL; | |
1da177e4 LT |
536 | |
537 | return AE_OK; | |
538 | } | |
539 | ||
1da177e4 | 540 | static acpi_status |
5b7734b4 AS |
541 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
542 | u32 bits, acpi_integer *value, | |
50526df6 | 543 | void *handler_context, void *region_context) |
1da177e4 | 544 | { |
3d02b90b | 545 | struct acpi_ec *ec = handler_context; |
5b7734b4 AS |
546 | int result = 0, i = 0; |
547 | u8 temp = 0; | |
1da177e4 | 548 | |
1da177e4 | 549 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 550 | return AE_BAD_PARAMETER; |
1da177e4 | 551 | |
5b7734b4 | 552 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 553 | return AE_BAD_PARAMETER; |
1da177e4 | 554 | |
5b7734b4 AS |
555 | if (bits != 8 && acpi_strict) |
556 | return AE_BAD_PARAMETER; | |
1da177e4 | 557 | |
5b7734b4 AS |
558 | while (bits - i > 0) { |
559 | if (function == ACPI_READ) { | |
560 | result = acpi_ec_read(ec, address, &temp); | |
561 | (*value) |= ((acpi_integer)temp) << i; | |
562 | } else { | |
563 | temp = 0xff & ((*value) >> i); | |
564 | result = acpi_ec_write(ec, address, temp); | |
565 | } | |
566 | i += 8; | |
567 | ++address; | |
1da177e4 LT |
568 | } |
569 | ||
1da177e4 LT |
570 | switch (result) { |
571 | case -EINVAL: | |
d550d98d | 572 | return AE_BAD_PARAMETER; |
1da177e4 LT |
573 | break; |
574 | case -ENODEV: | |
d550d98d | 575 | return AE_NOT_FOUND; |
1da177e4 LT |
576 | break; |
577 | case -ETIME: | |
d550d98d | 578 | return AE_TIME; |
1da177e4 LT |
579 | break; |
580 | default: | |
d550d98d | 581 | return AE_OK; |
1da177e4 | 582 | } |
1da177e4 LT |
583 | } |
584 | ||
1da177e4 LT |
585 | /* -------------------------------------------------------------------------- |
586 | FS Interface (/proc) | |
587 | -------------------------------------------------------------------------- */ | |
588 | ||
50526df6 | 589 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 590 | |
50526df6 | 591 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 592 | { |
3d02b90b | 593 | struct acpi_ec *ec = seq->private; |
1da177e4 | 594 | |
1da177e4 LT |
595 | if (!ec) |
596 | goto end; | |
597 | ||
01f22462 AS |
598 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
599 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
600 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
601 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 602 | ec->global_lock ? "yes" : "no"); |
50526df6 | 603 | end: |
d550d98d | 604 | return 0; |
1da177e4 LT |
605 | } |
606 | ||
607 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
608 | { | |
609 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
610 | } | |
611 | ||
703959d4 | 612 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
613 | .open = acpi_ec_info_open_fs, |
614 | .read = seq_read, | |
615 | .llseek = seq_lseek, | |
616 | .release = single_release, | |
1da177e4 LT |
617 | .owner = THIS_MODULE, |
618 | }; | |
619 | ||
50526df6 | 620 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 621 | { |
50526df6 | 622 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 623 | |
1da177e4 LT |
624 | if (!acpi_device_dir(device)) { |
625 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 626 | acpi_ec_dir); |
1da177e4 | 627 | if (!acpi_device_dir(device)) |
d550d98d | 628 | return -ENODEV; |
1da177e4 LT |
629 | } |
630 | ||
631 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 632 | acpi_device_dir(device)); |
1da177e4 | 633 | if (!entry) |
d550d98d | 634 | return -ENODEV; |
1da177e4 LT |
635 | else { |
636 | entry->proc_fops = &acpi_ec_info_ops; | |
637 | entry->data = acpi_driver_data(device); | |
638 | entry->owner = THIS_MODULE; | |
639 | } | |
640 | ||
d550d98d | 641 | return 0; |
1da177e4 LT |
642 | } |
643 | ||
50526df6 | 644 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 645 | { |
1da177e4 LT |
646 | |
647 | if (acpi_device_dir(device)) { | |
648 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
649 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
650 | acpi_device_dir(device) = NULL; | |
651 | } | |
652 | ||
d550d98d | 653 | return 0; |
1da177e4 LT |
654 | } |
655 | ||
1da177e4 LT |
656 | /* -------------------------------------------------------------------------- |
657 | Driver Interface | |
658 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
659 | static acpi_status |
660 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
661 | ||
c0900c35 AS |
662 | static struct acpi_ec *make_acpi_ec(void) |
663 | { | |
664 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
665 | if (!ec) | |
666 | return NULL; | |
080e412c | 667 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
668 | mutex_init(&ec->lock); |
669 | init_waitqueue_head(&ec->wait); | |
837012ed | 670 | INIT_LIST_HEAD(&ec->list); |
c0900c35 AS |
671 | return ec; |
672 | } | |
837012ed | 673 | |
c019b193 AS |
674 | static acpi_status |
675 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
676 | void *context, void **return_value) | |
677 | { | |
678 | struct acpi_namespace_node *node = handle; | |
679 | struct acpi_ec *ec = context; | |
680 | int value = 0; | |
681 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
682 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
683 | } | |
684 | return AE_OK; | |
685 | } | |
686 | ||
cd8c93a4 AS |
687 | static acpi_status |
688 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 689 | { |
cd8c93a4 AS |
690 | acpi_status status; |
691 | ||
692 | struct acpi_ec *ec = context; | |
693 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
694 | ec_parse_io_ports, ec); | |
695 | if (ACPI_FAILURE(status)) | |
696 | return status; | |
837012ed AS |
697 | |
698 | /* Get GPE bit assignment (EC events). */ | |
699 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
700 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
701 | if (ACPI_FAILURE(status)) | |
702 | return status; | |
c019b193 AS |
703 | /* Find and register all query methods */ |
704 | acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, | |
705 | acpi_ec_register_query_methods, ec, NULL); | |
837012ed AS |
706 | /* Use the global lock for all EC transactions? */ |
707 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 708 | ec->handle = handle; |
cd8c93a4 | 709 | return AE_CTRL_TERMINATE; |
837012ed AS |
710 | } |
711 | ||
4c611060 AS |
712 | static void ec_remove_handlers(struct acpi_ec *ec) |
713 | { | |
714 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
715 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 716 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
717 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
718 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 719 | pr_err(PREFIX "failed to remove gpe handler\n"); |
4c611060 AS |
720 | ec->handlers_installed = 0; |
721 | } | |
722 | ||
703959d4 | 723 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 724 | { |
703959d4 | 725 | struct acpi_ec *ec = NULL; |
45bea155 | 726 | |
45bea155 | 727 | if (!device) |
d550d98d | 728 | return -EINVAL; |
c0900c35 AS |
729 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
730 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
731 | ||
4c611060 AS |
732 | /* Check for boot EC */ |
733 | if (boot_ec) { | |
734 | if (boot_ec->handle == device->handle) { | |
735 | /* Pre-loaded EC from DSDT, just move pointer */ | |
736 | ec = boot_ec; | |
737 | boot_ec = NULL; | |
738 | goto end; | |
739 | } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { | |
740 | /* ECDT-based EC, time to shut it down */ | |
741 | ec_remove_handlers(boot_ec); | |
742 | kfree(boot_ec); | |
743 | first_ec = boot_ec = NULL; | |
744 | } | |
745 | } | |
746 | ||
c0900c35 | 747 | ec = make_acpi_ec(); |
45bea155 | 748 | if (!ec) |
d550d98d | 749 | return -ENOMEM; |
703959d4 | 750 | |
cd8c93a4 AS |
751 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
752 | AE_CTRL_TERMINATE) { | |
c0900c35 AS |
753 | kfree(ec); |
754 | return -EINVAL; | |
45bea155 | 755 | } |
c0900c35 | 756 | ec->handle = device->handle; |
4c611060 AS |
757 | end: |
758 | if (!first_ec) | |
759 | first_ec = ec; | |
c0900c35 | 760 | acpi_driver_data(device) = ec; |
c0900c35 | 761 | acpi_ec_add_fs(device); |
3ebe08a7 | 762 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 763 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 764 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 765 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 766 | return 0; |
1da177e4 LT |
767 | } |
768 | ||
50526df6 | 769 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 770 | { |
01f22462 | 771 | struct acpi_ec *ec; |
07ddf768 | 772 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 773 | |
1da177e4 | 774 | if (!device) |
d550d98d | 775 | return -EINVAL; |
1da177e4 LT |
776 | |
777 | ec = acpi_driver_data(device); | |
837012ed | 778 | mutex_lock(&ec->lock); |
07ddf768 | 779 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
780 | list_del(&handler->node); |
781 | kfree(handler); | |
782 | } | |
783 | mutex_unlock(&ec->lock); | |
1da177e4 | 784 | acpi_ec_remove_fs(device); |
c0900c35 | 785 | acpi_driver_data(device) = NULL; |
d033879c | 786 | if (ec == first_ec) |
c0900c35 | 787 | first_ec = NULL; |
4c611060 | 788 | kfree(ec); |
d550d98d | 789 | return 0; |
1da177e4 LT |
790 | } |
791 | ||
1da177e4 | 792 | static acpi_status |
c0900c35 | 793 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 794 | { |
3d02b90b | 795 | struct acpi_ec *ec = context; |
1da177e4 | 796 | |
01f22462 | 797 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 798 | return AE_OK; |
1da177e4 LT |
799 | |
800 | /* | |
801 | * The first address region returned is the data port, and | |
802 | * the second address region returned is the status/command | |
803 | * port. | |
804 | */ | |
01f22462 | 805 | if (ec->data_addr == 0) |
6ffb221a | 806 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 807 | else if (ec->command_addr == 0) |
6ffb221a | 808 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 809 | else |
1da177e4 | 810 | return AE_CTRL_TERMINATE; |
1da177e4 | 811 | |
1da177e4 LT |
812 | return AE_OK; |
813 | } | |
814 | ||
e8284321 AS |
815 | static int ec_install_handlers(struct acpi_ec *ec) |
816 | { | |
c0900c35 | 817 | acpi_status status; |
4c611060 AS |
818 | if (ec->handlers_installed) |
819 | return 0; | |
c0900c35 AS |
820 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
821 | ACPI_GPE_EDGE_TRIGGERED, | |
822 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
823 | if (ACPI_FAILURE(status)) |
824 | return -ENODEV; | |
01f22462 | 825 | |
e8284321 AS |
826 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
827 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
828 | ||
829 | status = acpi_install_address_space_handler(ec->handle, | |
830 | ACPI_ADR_SPACE_EC, | |
831 | &acpi_ec_space_handler, | |
832 | &acpi_ec_space_setup, ec); | |
833 | if (ACPI_FAILURE(status)) { | |
834 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
835 | return -ENODEV; | |
836 | } | |
837 | ||
4c611060 | 838 | ec->handlers_installed = 1; |
e8284321 AS |
839 | return 0; |
840 | } | |
841 | ||
50526df6 | 842 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 843 | { |
c0900c35 | 844 | struct acpi_ec *ec; |
837012ed | 845 | int ret = 0; |
1da177e4 | 846 | |
1da177e4 | 847 | if (!device) |
d550d98d | 848 | return -EINVAL; |
1da177e4 LT |
849 | |
850 | ec = acpi_driver_data(device); | |
851 | ||
852 | if (!ec) | |
d550d98d | 853 | return -EINVAL; |
1da177e4 | 854 | |
4c611060 | 855 | ret = ec_install_handlers(ec); |
837012ed AS |
856 | |
857 | /* EC is fully operational, allow queries */ | |
080e412c | 858 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 859 | return ret; |
1da177e4 LT |
860 | } |
861 | ||
50526df6 | 862 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 863 | { |
c0900c35 | 864 | struct acpi_ec *ec; |
1da177e4 | 865 | if (!device) |
d550d98d | 866 | return -EINVAL; |
1da177e4 | 867 | ec = acpi_driver_data(device); |
c0900c35 AS |
868 | if (!ec) |
869 | return -EINVAL; | |
4c611060 | 870 | ec_remove_handlers(ec); |
f9319f90 | 871 | |
d550d98d | 872 | return 0; |
1da177e4 LT |
873 | } |
874 | ||
c0900c35 AS |
875 | int __init acpi_ec_ecdt_probe(void) |
876 | { | |
877 | int ret; | |
878 | acpi_status status; | |
50526df6 | 879 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 880 | |
d66d969d AS |
881 | boot_ec = make_acpi_ec(); |
882 | if (!boot_ec) | |
c0900c35 AS |
883 | return -ENOMEM; |
884 | /* | |
885 | * Generate a boot ec context | |
886 | */ | |
15a58ed1 AS |
887 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
888 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 889 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 890 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
891 | boot_ec->command_addr = ecdt_ptr->control.address; |
892 | boot_ec->data_addr = ecdt_ptr->data.address; | |
893 | boot_ec->gpe = ecdt_ptr->gpe; | |
894 | boot_ec->handle = ACPI_ROOT_OBJECT; | |
895 | } else { | |
896 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); | |
897 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
898 | boot_ec, NULL); | |
2d8348b4 AS |
899 | /* Check that acpi_get_devices actually find something */ |
900 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 AS |
901 | goto error; |
902 | } | |
1da177e4 | 903 | |
d66d969d | 904 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
905 | if (!ret) { |
906 | first_ec = boot_ec; | |
e8284321 | 907 | return 0; |
d033879c | 908 | } |
c0900c35 | 909 | error: |
d66d969d AS |
910 | kfree(boot_ec); |
911 | boot_ec = NULL; | |
1da177e4 LT |
912 | return -ENODEV; |
913 | } | |
914 | ||
50526df6 | 915 | static int __init acpi_ec_init(void) |
1da177e4 | 916 | { |
50526df6 | 917 | int result = 0; |
1da177e4 | 918 | |
1da177e4 | 919 | if (acpi_disabled) |
d550d98d | 920 | return 0; |
1da177e4 LT |
921 | |
922 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
923 | if (!acpi_ec_dir) | |
d550d98d | 924 | return -ENODEV; |
1da177e4 LT |
925 | |
926 | /* Now register the driver for the EC */ | |
927 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
928 | if (result < 0) { | |
929 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 930 | return -ENODEV; |
1da177e4 LT |
931 | } |
932 | ||
d550d98d | 933 | return result; |
1da177e4 LT |
934 | } |
935 | ||
936 | subsys_initcall(acpi_ec_init); | |
937 | ||
938 | /* EC driver currently not unloadable */ | |
939 | #if 0 | |
50526df6 | 940 | static void __exit acpi_ec_exit(void) |
1da177e4 | 941 | { |
1da177e4 LT |
942 | |
943 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
944 | ||
945 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
946 | ||
d550d98d | 947 | return; |
1da177e4 | 948 | } |
7843932a | 949 | #endif /* 0 */ |