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 | ||
d772b3b3 MN |
29 | /* Uncomment next line to get verbose print outs*/ |
30 | /* #define DEBUG */ | |
31 | ||
1da177e4 LT |
32 | #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> | |
451566f4 | 39 | #include <linux/interrupt.h> |
837012ed | 40 | #include <linux/list.h> |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/acpi_drivers.h> | |
44 | #include <acpi/actypes.h> | |
45 | ||
1da177e4 | 46 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
48 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 49 | |
af3fd140 AS |
50 | #undef PREFIX |
51 | #define PREFIX "ACPI: EC: " | |
4350933a | 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 */ |
e6e82a30 | 76 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
703959d4 | 77 | |
080e412c AS |
78 | enum { |
79 | EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ | |
80 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ | |
7843932a | 81 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ |
b77d81b2 | 82 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
845625cd | 83 | EC_FLAGS_RESCHEDULE_POLL /* Re-schedule poll */ |
1da177e4 | 84 | }; |
6ffb221a DS |
85 | |
86 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 87 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
88 | typedef int (*acpi_ec_query_func) (void *data); |
89 | ||
90 | struct 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 | ||
a854e08a | 98 | static struct acpi_ec { |
703959d4 | 99 | acpi_handle handle; |
a86e2772 | 100 | unsigned long gpe; |
6ffb221a DS |
101 | unsigned long command_addr; |
102 | unsigned long data_addr; | |
703959d4 | 103 | unsigned long global_lock; |
080e412c | 104 | unsigned long flags; |
c787a855 | 105 | struct mutex lock; |
703959d4 | 106 | wait_queue_head_t wait; |
837012ed | 107 | struct list_head list; |
845625cd | 108 | struct delayed_work work; |
fa95ba04 | 109 | atomic_t irq_count; |
4c611060 | 110 | u8 handlers_installed; |
d033879c | 111 | } *boot_ec, *first_ec; |
703959d4 | 112 | |
1da177e4 LT |
113 | /* -------------------------------------------------------------------------- |
114 | Transaction Management | |
115 | -------------------------------------------------------------------------- */ | |
116 | ||
6ffb221a | 117 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 118 | { |
3ebe08a7 | 119 | u8 x = inb(ec->command_addr); |
86dae015 | 120 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 121 | return x; |
451566f4 DT |
122 | } |
123 | ||
6ffb221a | 124 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 125 | { |
3ebe08a7 | 126 | u8 x = inb(ec->data_addr); |
86dae015 | 127 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
6ffb221a | 128 | return inb(ec->data_addr); |
7c6db5e5 DS |
129 | } |
130 | ||
6ffb221a | 131 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 132 | { |
86dae015 | 133 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 134 | outb(command, ec->command_addr); |
45bea155 LY |
135 | } |
136 | ||
6ffb221a | 137 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 138 | { |
86dae015 | 139 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 140 | outb(data, ec->data_addr); |
703959d4 | 141 | } |
45bea155 | 142 | |
080e412c | 143 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 144 | { |
080e412c | 145 | if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags)) |
9e197219 | 146 | return 0; |
78d0af33 | 147 | if (event == ACPI_EC_EVENT_OBF_1) { |
080e412c | 148 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
703959d4 | 149 | return 1; |
78d0af33 | 150 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
080e412c | 151 | if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) |
703959d4 | 152 | return 1; |
45bea155 LY |
153 | } |
154 | ||
703959d4 | 155 | return 0; |
45bea155 | 156 | } |
451566f4 | 157 | |
845625cd | 158 | static void ec_schedule_ec_poll(struct acpi_ec *ec) |
7c6db5e5 | 159 | { |
845625cd AS |
160 | if (test_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags)) |
161 | schedule_delayed_work(&ec->work, | |
162 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
163 | } | |
03d1d99c | 164 | |
845625cd AS |
165 | static void ec_switch_to_poll_mode(struct acpi_ec *ec) |
166 | { | |
b77d81b2 | 167 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd AS |
168 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
169 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
170 | set_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); | |
171 | } | |
172 | ||
080e412c | 173 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) |
7c6db5e5 | 174 | { |
fa95ba04 | 175 | atomic_set(&ec->irq_count, 0); |
7843932a AS |
176 | if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && |
177 | likely(!force_poll)) { | |
080e412c AS |
178 | if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), |
179 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
b77d81b2 | 180 | return 0; |
080e412c AS |
181 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
182 | if (acpi_ec_check_status(ec, event)) { | |
b77d81b2 AS |
183 | /* missing GPEs, switch back to poll mode */ |
184 | if (printk_ratelimit()) | |
185 | pr_info(PREFIX "missing confirmations, " | |
3ebe08a7 | 186 | "switch off interrupt mode.\n"); |
b77d81b2 AS |
187 | ec_switch_to_poll_mode(ec); |
188 | ec_schedule_ec_poll(ec); | |
189 | return 0; | |
703959d4 | 190 | } |
7843932a AS |
191 | } else { |
192 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
193 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
194 | while (time_before(jiffies, delay)) { | |
195 | if (acpi_ec_check_status(ec, event)) | |
b77d81b2 | 196 | return 0; |
1b7fc5aa | 197 | msleep(1); |
7843932a | 198 | } |
af3fd140 | 199 | } |
dc0e8490 AS |
200 | pr_err(PREFIX "acpi_ec_wait timeout, status = 0x%2.2x, event = %s\n", |
201 | acpi_ec_read_status(ec), | |
202 | (event == ACPI_EC_EVENT_OBF_1) ? "\"b0=1\"" : "\"b1=0\""); | |
b77d81b2 | 203 | return -ETIME; |
1da177e4 LT |
204 | } |
205 | ||
703959d4 | 206 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 207 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
208 | u8 * rdata, unsigned rdata_len, |
209 | int force_poll) | |
45bea155 | 210 | { |
af3fd140 | 211 | int result = 0; |
080e412c | 212 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
3ebe08a7 | 213 | pr_debug(PREFIX "transaction start\n"); |
dc0e8490 | 214 | acpi_ec_write_cmd(ec, command); |
78d0af33 | 215 | for (; wdata_len > 0; --wdata_len) { |
080e412c | 216 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 217 | if (result) { |
3ebe08a7 | 218 | pr_err(PREFIX |
6ccedb10 | 219 | "write_cmd timeout, command = %d\n", command); |
af3fd140 AS |
220 | goto end; |
221 | } | |
080e412c | 222 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 223 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 224 | } |
45bea155 | 225 | |
d91df1aa | 226 | if (!rdata_len) { |
080e412c | 227 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 228 | if (result) { |
3ebe08a7 | 229 | pr_err(PREFIX |
6ccedb10 | 230 | "finish-write timeout, command = %d\n", command); |
af3fd140 AS |
231 | goto end; |
232 | } | |
080e412c AS |
233 | } else if (command == ACPI_EC_COMMAND_QUERY) |
234 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
45bea155 | 235 | |
78d0af33 | 236 | for (; rdata_len > 0; --rdata_len) { |
080e412c | 237 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); |
af3fd140 | 238 | if (result) { |
3ebe08a7 | 239 | pr_err(PREFIX "read timeout, command = %d\n", command); |
af3fd140 AS |
240 | goto end; |
241 | } | |
0c5d31f4 AS |
242 | /* Don't expect GPE after last read */ |
243 | if (rdata_len > 1) | |
244 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
6ffb221a | 245 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 246 | } |
af3fd140 | 247 | end: |
3ebe08a7 | 248 | pr_debug(PREFIX "transaction end\n"); |
af3fd140 | 249 | return result; |
45bea155 LY |
250 | } |
251 | ||
3576cf61 | 252 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 253 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
254 | u8 * rdata, unsigned rdata_len, |
255 | int force_poll) | |
1da177e4 | 256 | { |
d7a76e4c | 257 | int status; |
50526df6 | 258 | u32 glk; |
1da177e4 | 259 | |
d7a76e4c | 260 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 261 | return -EINVAL; |
1da177e4 | 262 | |
6ccedb10 AS |
263 | if (rdata) |
264 | memset(rdata, 0, rdata_len); | |
1da177e4 | 265 | |
523953b4 | 266 | mutex_lock(&ec->lock); |
703959d4 | 267 | if (ec->global_lock) { |
1da177e4 | 268 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
269 | if (ACPI_FAILURE(status)) { |
270 | mutex_unlock(&ec->lock); | |
d550d98d | 271 | return -ENODEV; |
c24e912b | 272 | } |
1da177e4 | 273 | } |
451566f4 | 274 | |
080e412c | 275 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 276 | if (status) { |
3ebe08a7 MN |
277 | pr_err(PREFIX "input buffer is not empty, " |
278 | "aborting transaction\n"); | |
451566f4 | 279 | goto end; |
716e084e | 280 | } |
1da177e4 | 281 | |
6ccedb10 AS |
282 | status = acpi_ec_transaction_unlocked(ec, command, |
283 | wdata, wdata_len, | |
00eb43a1 LP |
284 | rdata, rdata_len, |
285 | force_poll); | |
1da177e4 | 286 | |
6ccedb10 | 287 | end: |
1da177e4 | 288 | |
703959d4 | 289 | if (ec->global_lock) |
1da177e4 | 290 | acpi_release_global_lock(glk); |
523953b4 | 291 | mutex_unlock(&ec->lock); |
1da177e4 | 292 | |
d550d98d | 293 | return status; |
1da177e4 LT |
294 | } |
295 | ||
c45aac43 AS |
296 | /* |
297 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
298 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
299 | */ | |
300 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
301 | { | |
302 | u8 d; | |
00eb43a1 | 303 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
304 | } |
305 | ||
306 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
307 | { | |
00eb43a1 | 308 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
309 | } |
310 | ||
6ccedb10 | 311 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
312 | { |
313 | int result; | |
314 | u8 d; | |
315 | ||
316 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 317 | &address, 1, &d, 1, 0); |
3576cf61 DS |
318 | *data = d; |
319 | return result; | |
320 | } | |
6ffb221a | 321 | |
3576cf61 DS |
322 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
323 | { | |
6ccedb10 AS |
324 | u8 wdata[2] = { address, data }; |
325 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 326 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
327 | } |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Externally callable EC access functions. For now, assume 1 EC only | |
331 | */ | |
c45aac43 AS |
332 | int ec_burst_enable(void) |
333 | { | |
c45aac43 AS |
334 | if (!first_ec) |
335 | return -ENODEV; | |
d033879c | 336 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
337 | } |
338 | ||
339 | EXPORT_SYMBOL(ec_burst_enable); | |
340 | ||
341 | int ec_burst_disable(void) | |
342 | { | |
c45aac43 AS |
343 | if (!first_ec) |
344 | return -ENODEV; | |
d033879c | 345 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
346 | } |
347 | ||
348 | EXPORT_SYMBOL(ec_burst_disable); | |
349 | ||
6ccedb10 | 350 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 351 | { |
1da177e4 | 352 | int err; |
6ffb221a | 353 | u8 temp_data; |
1da177e4 LT |
354 | |
355 | if (!first_ec) | |
356 | return -ENODEV; | |
357 | ||
d033879c | 358 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
359 | |
360 | if (!err) { | |
361 | *val = temp_data; | |
362 | return 0; | |
50526df6 | 363 | } else |
1da177e4 LT |
364 | return err; |
365 | } | |
50526df6 | 366 | |
1da177e4 LT |
367 | EXPORT_SYMBOL(ec_read); |
368 | ||
50526df6 | 369 | int ec_write(u8 addr, u8 val) |
1da177e4 | 370 | { |
1da177e4 LT |
371 | int err; |
372 | ||
373 | if (!first_ec) | |
374 | return -ENODEV; | |
375 | ||
d033879c | 376 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
377 | |
378 | return err; | |
379 | } | |
50526df6 | 380 | |
1da177e4 LT |
381 | EXPORT_SYMBOL(ec_write); |
382 | ||
616362de | 383 | int ec_transaction(u8 command, |
9e197219 | 384 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
385 | u8 * rdata, unsigned rdata_len, |
386 | int force_poll) | |
45bea155 | 387 | { |
d7a76e4c LP |
388 | if (!first_ec) |
389 | return -ENODEV; | |
45bea155 | 390 | |
d033879c | 391 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
392 | wdata_len, rdata, rdata_len, |
393 | force_poll); | |
45bea155 | 394 | } |
1da177e4 | 395 | |
ab9e43c6 LP |
396 | EXPORT_SYMBOL(ec_transaction); |
397 | ||
6ccedb10 | 398 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
399 | { |
400 | int result; | |
6ccedb10 | 401 | u8 d; |
1da177e4 | 402 | |
6ccedb10 AS |
403 | if (!ec || !data) |
404 | return -EINVAL; | |
1da177e4 | 405 | |
6ccedb10 AS |
406 | /* |
407 | * Query the EC to find out which _Qxx method we need to evaluate. | |
408 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
409 | * bit to be cleared (and thus clearing the interrupt source). | |
410 | */ | |
716e084e | 411 | |
00eb43a1 | 412 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
413 | if (result) |
414 | return result; | |
1da177e4 | 415 | |
6ccedb10 AS |
416 | if (!d) |
417 | return -ENODATA; | |
1da177e4 | 418 | |
6ccedb10 AS |
419 | *data = d; |
420 | return 0; | |
1da177e4 LT |
421 | } |
422 | ||
1da177e4 LT |
423 | /* -------------------------------------------------------------------------- |
424 | Event Management | |
425 | -------------------------------------------------------------------------- */ | |
837012ed AS |
426 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
427 | acpi_handle handle, acpi_ec_query_func func, | |
428 | void *data) | |
429 | { | |
430 | struct acpi_ec_query_handler *handler = | |
431 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
432 | if (!handler) | |
433 | return -ENOMEM; | |
434 | ||
435 | handler->query_bit = query_bit; | |
436 | handler->handle = handle; | |
437 | handler->func = func; | |
438 | handler->data = data; | |
439 | mutex_lock(&ec->lock); | |
30c08574 | 440 | list_add(&handler->node, &ec->list); |
837012ed AS |
441 | mutex_unlock(&ec->lock); |
442 | return 0; | |
443 | } | |
444 | ||
445 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
446 | ||
447 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
448 | { | |
1544fdbc | 449 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 450 | mutex_lock(&ec->lock); |
1544fdbc | 451 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
452 | if (query_bit == handler->query_bit) { |
453 | list_del(&handler->node); | |
454 | kfree(handler); | |
837012ed AS |
455 | } |
456 | } | |
457 | mutex_unlock(&ec->lock); | |
458 | } | |
459 | ||
460 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 461 | |
50526df6 | 462 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 463 | { |
3d02b90b | 464 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 465 | u8 value = 0; |
837012ed | 466 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 467 | |
5d0c288b | 468 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 469 | return; |
837012ed AS |
470 | mutex_lock(&ec->lock); |
471 | list_for_each_entry(handler, &ec->list, node) { | |
472 | if (value == handler->query_bit) { | |
473 | /* have custom handler for this bit */ | |
474 | memcpy(©, handler, sizeof(copy)); | |
475 | mutex_unlock(&ec->lock); | |
476 | if (copy.func) { | |
477 | copy.func(copy.data); | |
478 | } else if (copy.handle) { | |
479 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
480 | } | |
481 | return; | |
482 | } | |
483 | } | |
484 | mutex_unlock(&ec->lock); | |
45bea155 | 485 | } |
1da177e4 | 486 | |
50526df6 | 487 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 488 | { |
50526df6 | 489 | acpi_status status = AE_OK; |
3d02b90b | 490 | struct acpi_ec *ec = data; |
845625cd | 491 | u8 state = acpi_ec_read_status(ec); |
00eb43a1 | 492 | |
3ebe08a7 | 493 | pr_debug(PREFIX "~~~> interrupt\n"); |
fa95ba04 AS |
494 | atomic_inc(&ec->irq_count); |
495 | if (atomic_read(&ec->irq_count) > 5) { | |
496 | pr_err(PREFIX "GPE storm detected, disabling EC GPE\n"); | |
497 | ec_switch_to_poll_mode(ec); | |
498 | goto end; | |
499 | } | |
080e412c | 500 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
7843932a | 501 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) |
af3fd140 | 502 | wake_up(&ec->wait); |
451566f4 | 503 | |
845625cd | 504 | if (state & ACPI_EC_FLAG_SCI) { |
080e412c AS |
505 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
506 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, | |
507 | acpi_ec_gpe_query, ec); | |
845625cd | 508 | } else if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
b77d81b2 | 509 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags) && |
845625cd | 510 | in_interrupt()) { |
95b937e3 | 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); |
845625cd | 516 | clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); |
95b937e3 | 517 | } |
fa95ba04 | 518 | end: |
845625cd | 519 | ec_schedule_ec_poll(ec); |
7843932a | 520 | return ACPI_SUCCESS(status) ? |
50526df6 | 521 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
522 | } |
523 | ||
845625cd AS |
524 | static void do_ec_poll(struct work_struct *work) |
525 | { | |
526 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work.work); | |
fa95ba04 | 527 | atomic_set(&ec->irq_count, 0); |
845625cd AS |
528 | (void)acpi_ec_gpe_handler(ec); |
529 | } | |
530 | ||
1da177e4 LT |
531 | /* -------------------------------------------------------------------------- |
532 | Address Space Management | |
533 | -------------------------------------------------------------------------- */ | |
534 | ||
1da177e4 | 535 | static acpi_status |
5b7734b4 AS |
536 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
537 | u32 bits, acpi_integer *value, | |
50526df6 | 538 | void *handler_context, void *region_context) |
1da177e4 | 539 | { |
3d02b90b | 540 | struct acpi_ec *ec = handler_context; |
3e71a87d | 541 | int result = 0, i; |
5b7734b4 | 542 | u8 temp = 0; |
1da177e4 | 543 | |
1da177e4 | 544 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 545 | return AE_BAD_PARAMETER; |
1da177e4 | 546 | |
5b7734b4 | 547 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 548 | return AE_BAD_PARAMETER; |
1da177e4 | 549 | |
5b7734b4 AS |
550 | if (bits != 8 && acpi_strict) |
551 | return AE_BAD_PARAMETER; | |
1da177e4 | 552 | |
b3b233c7 AS |
553 | acpi_ec_burst_enable(ec); |
554 | ||
3e71a87d AS |
555 | if (function == ACPI_READ) { |
556 | result = acpi_ec_read(ec, address, &temp); | |
557 | *value = temp; | |
558 | } else { | |
559 | temp = 0xff & (*value); | |
560 | result = acpi_ec_write(ec, address, temp); | |
561 | } | |
562 | ||
563 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
564 | ++address; | |
5b7734b4 AS |
565 | if (function == ACPI_READ) { |
566 | result = acpi_ec_read(ec, address, &temp); | |
567 | (*value) |= ((acpi_integer)temp) << i; | |
568 | } else { | |
569 | temp = 0xff & ((*value) >> i); | |
570 | result = acpi_ec_write(ec, address, temp); | |
571 | } | |
1da177e4 LT |
572 | } |
573 | ||
b3b233c7 AS |
574 | acpi_ec_burst_disable(ec); |
575 | ||
1da177e4 LT |
576 | switch (result) { |
577 | case -EINVAL: | |
d550d98d | 578 | return AE_BAD_PARAMETER; |
1da177e4 LT |
579 | break; |
580 | case -ENODEV: | |
d550d98d | 581 | return AE_NOT_FOUND; |
1da177e4 LT |
582 | break; |
583 | case -ETIME: | |
d550d98d | 584 | return AE_TIME; |
1da177e4 LT |
585 | break; |
586 | default: | |
d550d98d | 587 | return AE_OK; |
1da177e4 | 588 | } |
1da177e4 LT |
589 | } |
590 | ||
1da177e4 LT |
591 | /* -------------------------------------------------------------------------- |
592 | FS Interface (/proc) | |
593 | -------------------------------------------------------------------------- */ | |
594 | ||
50526df6 | 595 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 596 | |
50526df6 | 597 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 598 | { |
3d02b90b | 599 | struct acpi_ec *ec = seq->private; |
1da177e4 | 600 | |
1da177e4 LT |
601 | if (!ec) |
602 | goto end; | |
603 | ||
01f22462 AS |
604 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
605 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
606 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
607 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 608 | ec->global_lock ? "yes" : "no"); |
50526df6 | 609 | end: |
d550d98d | 610 | return 0; |
1da177e4 LT |
611 | } |
612 | ||
613 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
614 | { | |
615 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
616 | } | |
617 | ||
703959d4 | 618 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
619 | .open = acpi_ec_info_open_fs, |
620 | .read = seq_read, | |
621 | .llseek = seq_lseek, | |
622 | .release = single_release, | |
1da177e4 LT |
623 | .owner = THIS_MODULE, |
624 | }; | |
625 | ||
50526df6 | 626 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 627 | { |
50526df6 | 628 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 629 | |
1da177e4 LT |
630 | if (!acpi_device_dir(device)) { |
631 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 632 | acpi_ec_dir); |
1da177e4 | 633 | if (!acpi_device_dir(device)) |
d550d98d | 634 | return -ENODEV; |
1da177e4 LT |
635 | } |
636 | ||
cf7acfab DL |
637 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
638 | acpi_device_dir(device), | |
639 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 640 | if (!entry) |
d550d98d | 641 | return -ENODEV; |
d550d98d | 642 | return 0; |
1da177e4 LT |
643 | } |
644 | ||
50526df6 | 645 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 646 | { |
1da177e4 LT |
647 | |
648 | if (acpi_device_dir(device)) { | |
649 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
650 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
651 | acpi_device_dir(device) = NULL; | |
652 | } | |
653 | ||
d550d98d | 654 | return 0; |
1da177e4 LT |
655 | } |
656 | ||
1da177e4 LT |
657 | /* -------------------------------------------------------------------------- |
658 | Driver Interface | |
659 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
660 | static acpi_status |
661 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
662 | ||
c0900c35 AS |
663 | static struct acpi_ec *make_acpi_ec(void) |
664 | { | |
665 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
666 | if (!ec) | |
667 | return NULL; | |
080e412c | 668 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
669 | mutex_init(&ec->lock); |
670 | init_waitqueue_head(&ec->wait); | |
837012ed | 671 | INIT_LIST_HEAD(&ec->list); |
845625cd | 672 | INIT_DELAYED_WORK_DEFERRABLE(&ec->work, do_ec_poll); |
fa95ba04 | 673 | atomic_set(&ec->irq_count, 0); |
c0900c35 AS |
674 | return ec; |
675 | } | |
837012ed | 676 | |
c019b193 AS |
677 | static acpi_status |
678 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
679 | void *context, void **return_value) | |
680 | { | |
681 | struct acpi_namespace_node *node = handle; | |
682 | struct acpi_ec *ec = context; | |
683 | int value = 0; | |
684 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
685 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
686 | } | |
687 | return AE_OK; | |
688 | } | |
689 | ||
cd8c93a4 AS |
690 | static acpi_status |
691 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 692 | { |
cd8c93a4 AS |
693 | acpi_status status; |
694 | ||
695 | struct acpi_ec *ec = context; | |
696 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
697 | ec_parse_io_ports, ec); | |
698 | if (ACPI_FAILURE(status)) | |
699 | return status; | |
837012ed AS |
700 | |
701 | /* Get GPE bit assignment (EC events). */ | |
702 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
703 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
704 | if (ACPI_FAILURE(status)) | |
705 | return status; | |
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 | ||
845625cd AS |
712 | static void ec_poll_stop(struct acpi_ec *ec) |
713 | { | |
714 | clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags); | |
715 | cancel_delayed_work(&ec->work); | |
716 | } | |
717 | ||
4c611060 AS |
718 | static void ec_remove_handlers(struct acpi_ec *ec) |
719 | { | |
845625cd | 720 | ec_poll_stop(ec); |
4c611060 AS |
721 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
722 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 723 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
724 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
725 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 726 | pr_err(PREFIX "failed to remove gpe handler\n"); |
4c611060 AS |
727 | ec->handlers_installed = 0; |
728 | } | |
729 | ||
703959d4 | 730 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 731 | { |
703959d4 | 732 | struct acpi_ec *ec = NULL; |
45bea155 | 733 | |
45bea155 | 734 | if (!device) |
d550d98d | 735 | return -EINVAL; |
c0900c35 AS |
736 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
737 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
738 | ||
4c611060 | 739 | /* Check for boot EC */ |
ce52ddf5 AS |
740 | if (boot_ec && |
741 | (boot_ec->handle == device->handle || | |
742 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
743 | ec = boot_ec; | |
744 | boot_ec = NULL; | |
745 | } else { | |
746 | ec = make_acpi_ec(); | |
747 | if (!ec) | |
748 | return -ENOMEM; | |
749 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
750 | AE_CTRL_TERMINATE) { | |
751 | kfree(ec); | |
752 | return -EINVAL; | |
4c611060 AS |
753 | } |
754 | } | |
755 | ||
c0900c35 | 756 | ec->handle = device->handle; |
ce52ddf5 AS |
757 | |
758 | /* Find and register all query methods */ | |
759 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
760 | acpi_ec_register_query_methods, ec, NULL); | |
761 | ||
4c611060 AS |
762 | if (!first_ec) |
763 | first_ec = ec; | |
c0900c35 | 764 | acpi_driver_data(device) = ec; |
c0900c35 | 765 | acpi_ec_add_fs(device); |
3ebe08a7 | 766 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 767 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 768 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 769 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 770 | return 0; |
1da177e4 LT |
771 | } |
772 | ||
50526df6 | 773 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 774 | { |
01f22462 | 775 | struct acpi_ec *ec; |
07ddf768 | 776 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 777 | |
1da177e4 | 778 | if (!device) |
d550d98d | 779 | return -EINVAL; |
1da177e4 LT |
780 | |
781 | ec = acpi_driver_data(device); | |
837012ed | 782 | mutex_lock(&ec->lock); |
07ddf768 | 783 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
784 | list_del(&handler->node); |
785 | kfree(handler); | |
786 | } | |
787 | mutex_unlock(&ec->lock); | |
1da177e4 | 788 | acpi_ec_remove_fs(device); |
c0900c35 | 789 | acpi_driver_data(device) = NULL; |
d033879c | 790 | if (ec == first_ec) |
c0900c35 | 791 | first_ec = NULL; |
4c611060 | 792 | kfree(ec); |
d550d98d | 793 | return 0; |
1da177e4 LT |
794 | } |
795 | ||
1da177e4 | 796 | static acpi_status |
c0900c35 | 797 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 798 | { |
3d02b90b | 799 | struct acpi_ec *ec = context; |
1da177e4 | 800 | |
01f22462 | 801 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 802 | return AE_OK; |
1da177e4 LT |
803 | |
804 | /* | |
805 | * The first address region returned is the data port, and | |
806 | * the second address region returned is the status/command | |
807 | * port. | |
808 | */ | |
01f22462 | 809 | if (ec->data_addr == 0) |
6ffb221a | 810 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 811 | else if (ec->command_addr == 0) |
6ffb221a | 812 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 813 | else |
1da177e4 | 814 | return AE_CTRL_TERMINATE; |
1da177e4 | 815 | |
1da177e4 LT |
816 | return AE_OK; |
817 | } | |
818 | ||
e8284321 AS |
819 | static int ec_install_handlers(struct acpi_ec *ec) |
820 | { | |
c0900c35 | 821 | acpi_status status; |
4c611060 AS |
822 | if (ec->handlers_installed) |
823 | return 0; | |
c0900c35 AS |
824 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
825 | ACPI_GPE_EDGE_TRIGGERED, | |
826 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
827 | if (ACPI_FAILURE(status)) |
828 | return -ENODEV; | |
01f22462 | 829 | |
e8284321 AS |
830 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
831 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
832 | ||
833 | status = acpi_install_address_space_handler(ec->handle, | |
834 | ACPI_ADR_SPACE_EC, | |
835 | &acpi_ec_space_handler, | |
6d9e1120 | 836 | NULL, ec); |
e8284321 AS |
837 | if (ACPI_FAILURE(status)) { |
838 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
839 | return -ENODEV; | |
840 | } | |
841 | ||
4c611060 | 842 | ec->handlers_installed = 1; |
e8284321 AS |
843 | return 0; |
844 | } | |
845 | ||
50526df6 | 846 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 847 | { |
c0900c35 | 848 | struct acpi_ec *ec; |
837012ed | 849 | int ret = 0; |
1da177e4 | 850 | |
1da177e4 | 851 | if (!device) |
d550d98d | 852 | return -EINVAL; |
1da177e4 LT |
853 | |
854 | ec = acpi_driver_data(device); | |
855 | ||
856 | if (!ec) | |
d550d98d | 857 | return -EINVAL; |
1da177e4 | 858 | |
4c611060 | 859 | ret = ec_install_handlers(ec); |
837012ed AS |
860 | |
861 | /* EC is fully operational, allow queries */ | |
080e412c | 862 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
845625cd | 863 | ec_schedule_ec_poll(ec); |
837012ed | 864 | return ret; |
1da177e4 LT |
865 | } |
866 | ||
50526df6 | 867 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 868 | { |
c0900c35 | 869 | struct acpi_ec *ec; |
1da177e4 | 870 | if (!device) |
d550d98d | 871 | return -EINVAL; |
1da177e4 | 872 | ec = acpi_driver_data(device); |
c0900c35 AS |
873 | if (!ec) |
874 | return -EINVAL; | |
4c611060 | 875 | ec_remove_handlers(ec); |
f9319f90 | 876 | |
d550d98d | 877 | return 0; |
1da177e4 LT |
878 | } |
879 | ||
c04209a7 AS |
880 | int __init acpi_boot_ec_enable(void) |
881 | { | |
882 | if (!boot_ec || boot_ec->handlers_installed) | |
883 | return 0; | |
884 | if (!ec_install_handlers(boot_ec)) { | |
885 | first_ec = boot_ec; | |
886 | return 0; | |
887 | } | |
888 | return -EFAULT; | |
889 | } | |
890 | ||
223883b7 AS |
891 | static const struct acpi_device_id ec_device_ids[] = { |
892 | {"PNP0C09", 0}, | |
893 | {"", 0}, | |
894 | }; | |
895 | ||
c0900c35 AS |
896 | int __init acpi_ec_ecdt_probe(void) |
897 | { | |
898 | int ret; | |
899 | acpi_status status; | |
50526df6 | 900 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 901 | |
d66d969d AS |
902 | boot_ec = make_acpi_ec(); |
903 | if (!boot_ec) | |
c0900c35 AS |
904 | return -ENOMEM; |
905 | /* | |
906 | * Generate a boot ec context | |
907 | */ | |
15a58ed1 AS |
908 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
909 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 910 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 911 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
912 | boot_ec->command_addr = ecdt_ptr->control.address; |
913 | boot_ec->data_addr = ecdt_ptr->data.address; | |
914 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 915 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 916 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 917 | } else { |
5870a8cd AS |
918 | /* This workaround is needed only on some broken machines, |
919 | * which require early EC, but fail to provide ECDT */ | |
920 | acpi_handle x; | |
cd8c93a4 AS |
921 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
922 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
923 | boot_ec, NULL); | |
2d8348b4 AS |
924 | /* Check that acpi_get_devices actually find something */ |
925 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 926 | goto error; |
5870a8cd AS |
927 | /* We really need to limit this workaround, the only ASUS, |
928 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 929 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
930 | */ |
931 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 932 | return -ENODEV; |
cd8c93a4 | 933 | } |
1da177e4 | 934 | |
d66d969d | 935 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
936 | if (!ret) { |
937 | first_ec = boot_ec; | |
e8284321 | 938 | return 0; |
d033879c | 939 | } |
c0900c35 | 940 | error: |
d66d969d AS |
941 | kfree(boot_ec); |
942 | boot_ec = NULL; | |
1da177e4 LT |
943 | return -ENODEV; |
944 | } | |
945 | ||
223883b7 AS |
946 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
947 | { | |
948 | struct acpi_ec *ec = acpi_driver_data(device); | |
949 | /* Stop using GPE */ | |
950 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
951 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
952 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | static int acpi_ec_resume(struct acpi_device *device) | |
957 | { | |
958 | struct acpi_ec *ec = acpi_driver_data(device); | |
959 | /* Enable use of GPE back */ | |
960 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
961 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
962 | return 0; | |
963 | } | |
964 | ||
965 | static struct acpi_driver acpi_ec_driver = { | |
966 | .name = "ec", | |
967 | .class = ACPI_EC_CLASS, | |
968 | .ids = ec_device_ids, | |
969 | .ops = { | |
970 | .add = acpi_ec_add, | |
971 | .remove = acpi_ec_remove, | |
972 | .start = acpi_ec_start, | |
973 | .stop = acpi_ec_stop, | |
974 | .suspend = acpi_ec_suspend, | |
975 | .resume = acpi_ec_resume, | |
976 | }, | |
977 | }; | |
978 | ||
50526df6 | 979 | static int __init acpi_ec_init(void) |
1da177e4 | 980 | { |
50526df6 | 981 | int result = 0; |
1da177e4 | 982 | |
1da177e4 | 983 | if (acpi_disabled) |
d550d98d | 984 | return 0; |
1da177e4 LT |
985 | |
986 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
987 | if (!acpi_ec_dir) | |
d550d98d | 988 | return -ENODEV; |
1da177e4 LT |
989 | |
990 | /* Now register the driver for the EC */ | |
991 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
992 | if (result < 0) { | |
993 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 994 | return -ENODEV; |
1da177e4 LT |
995 | } |
996 | ||
d550d98d | 997 | return result; |
1da177e4 LT |
998 | } |
999 | ||
1000 | subsys_initcall(acpi_ec_init); | |
1001 | ||
1002 | /* EC driver currently not unloadable */ | |
1003 | #if 0 | |
50526df6 | 1004 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1005 | { |
1da177e4 LT |
1006 | |
1007 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1008 | ||
1009 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1010 | ||
d550d98d | 1011 | return; |
1da177e4 | 1012 | } |
7843932a | 1013 | #endif /* 0 */ |