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 | |
703959d4 | 50 | /* EC status register */ |
1da177e4 LT |
51 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
52 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 53 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 54 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 55 | |
703959d4 | 56 | /* EC commands */ |
3261ff4d | 57 | enum ec_command { |
6ccedb10 AS |
58 | ACPI_EC_COMMAND_READ = 0x80, |
59 | ACPI_EC_COMMAND_WRITE = 0x81, | |
60 | ACPI_EC_BURST_ENABLE = 0x82, | |
61 | ACPI_EC_BURST_DISABLE = 0x83, | |
62 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 63 | }; |
837012ed | 64 | |
703959d4 | 65 | /* EC events */ |
3261ff4d | 66 | enum ec_event { |
703959d4 | 67 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
6ccedb10 | 68 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
69 | }; |
70 | ||
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 73 | |
3261ff4d | 74 | static enum ec_mode { |
6ccedb10 AS |
75 | EC_INTR = 1, /* Output buffer full */ |
76 | EC_POLL, /* Input buffer empty */ | |
3261ff4d | 77 | } acpi_ec_mode = EC_INTR; |
703959d4 | 78 | |
50526df6 LB |
79 | static int acpi_ec_remove(struct acpi_device *device, int type); |
80 | static int acpi_ec_start(struct acpi_device *device); | |
81 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 82 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 | 83 | |
1ba90e3a TR |
84 | static const struct acpi_device_id ec_device_ids[] = { |
85 | {"PNP0C09", 0}, | |
86 | {"", 0}, | |
87 | }; | |
88 | ||
1da177e4 | 89 | static struct acpi_driver acpi_ec_driver = { |
c2b6705b | 90 | .name = "ec", |
50526df6 | 91 | .class = ACPI_EC_CLASS, |
1ba90e3a | 92 | .ids = ec_device_ids, |
50526df6 | 93 | .ops = { |
703959d4 | 94 | .add = acpi_ec_add, |
50526df6 LB |
95 | .remove = acpi_ec_remove, |
96 | .start = acpi_ec_start, | |
97 | .stop = acpi_ec_stop, | |
98 | }, | |
1da177e4 | 99 | }; |
6ffb221a DS |
100 | |
101 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 102 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
103 | typedef int (*acpi_ec_query_func) (void *data); |
104 | ||
105 | struct acpi_ec_query_handler { | |
106 | struct list_head node; | |
107 | acpi_ec_query_func func; | |
108 | acpi_handle handle; | |
109 | void *data; | |
110 | u8 query_bit; | |
111 | }; | |
112 | ||
a854e08a | 113 | static struct acpi_ec { |
703959d4 | 114 | acpi_handle handle; |
a86e2772 | 115 | unsigned long gpe; |
6ffb221a DS |
116 | unsigned long command_addr; |
117 | unsigned long data_addr; | |
703959d4 | 118 | unsigned long global_lock; |
c787a855 | 119 | struct mutex lock; |
5d0c288b | 120 | atomic_t query_pending; |
9e197219 | 121 | atomic_t event_count; |
703959d4 | 122 | wait_queue_head_t wait; |
837012ed | 123 | struct list_head list; |
4c611060 | 124 | u8 handlers_installed; |
d033879c | 125 | } *boot_ec, *first_ec; |
703959d4 | 126 | |
1da177e4 LT |
127 | /* -------------------------------------------------------------------------- |
128 | Transaction Management | |
129 | -------------------------------------------------------------------------- */ | |
130 | ||
6ffb221a | 131 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 132 | { |
6ffb221a | 133 | return inb(ec->command_addr); |
451566f4 DT |
134 | } |
135 | ||
6ffb221a | 136 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 137 | { |
6ffb221a | 138 | return inb(ec->data_addr); |
7c6db5e5 DS |
139 | } |
140 | ||
6ffb221a | 141 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 142 | { |
6ffb221a | 143 | outb(command, ec->command_addr); |
45bea155 LY |
144 | } |
145 | ||
6ffb221a | 146 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 147 | { |
6ffb221a | 148 | outb(data, ec->data_addr); |
703959d4 | 149 | } |
45bea155 | 150 | |
9e197219 AS |
151 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event, |
152 | unsigned old_count) | |
6ffb221a | 153 | { |
bec5a1e0 | 154 | u8 status = acpi_ec_read_status(ec); |
9e197219 AS |
155 | if (old_count == atomic_read(&ec->event_count)) |
156 | return 0; | |
78d0af33 | 157 | if (event == ACPI_EC_EVENT_OBF_1) { |
703959d4 DS |
158 | if (status & ACPI_EC_FLAG_OBF) |
159 | return 1; | |
78d0af33 | 160 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
703959d4 DS |
161 | if (!(status & ACPI_EC_FLAG_IBF)) |
162 | return 1; | |
45bea155 LY |
163 | } |
164 | ||
703959d4 | 165 | return 0; |
45bea155 | 166 | } |
451566f4 | 167 | |
00eb43a1 LP |
168 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, |
169 | unsigned count, int force_poll) | |
7c6db5e5 | 170 | { |
00eb43a1 | 171 | if (unlikely(force_poll) || acpi_ec_mode == EC_POLL) { |
50c1e113 AS |
172 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
173 | while (time_before(jiffies, delay)) { | |
9e197219 | 174 | if (acpi_ec_check_status(ec, event, 0)) |
7c6db5e5 DS |
175 | return 0; |
176 | } | |
af3fd140 AS |
177 | } else { |
178 | if (wait_event_timeout(ec->wait, | |
9e197219 | 179 | acpi_ec_check_status(ec, event, count), |
af3fd140 | 180 | msecs_to_jiffies(ACPI_EC_DELAY)) || |
9e197219 | 181 | acpi_ec_check_status(ec, event, 0)) { |
703959d4 | 182 | return 0; |
af3fd140 AS |
183 | } else { |
184 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
185 | " status = %d, expect_event = %d\n", | |
6ccedb10 | 186 | acpi_ec_read_status(ec), event); |
703959d4 | 187 | } |
af3fd140 | 188 | } |
1da177e4 | 189 | |
d550d98d | 190 | return -ETIME; |
1da177e4 LT |
191 | } |
192 | ||
703959d4 | 193 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 194 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
195 | u8 * rdata, unsigned rdata_len, |
196 | int force_poll) | |
45bea155 | 197 | { |
af3fd140 | 198 | int result = 0; |
9e197219 | 199 | unsigned count = atomic_read(&ec->event_count); |
703959d4 | 200 | acpi_ec_write_cmd(ec, command); |
45bea155 | 201 | |
78d0af33 | 202 | for (; wdata_len > 0; --wdata_len) { |
00eb43a1 | 203 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count, force_poll); |
af3fd140 | 204 | if (result) { |
6ccedb10 AS |
205 | printk(KERN_ERR PREFIX |
206 | "write_cmd timeout, command = %d\n", command); | |
af3fd140 AS |
207 | goto end; |
208 | } | |
9e197219 | 209 | count = atomic_read(&ec->event_count); |
703959d4 | 210 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 211 | } |
45bea155 | 212 | |
d91df1aa | 213 | if (!rdata_len) { |
00eb43a1 | 214 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count, force_poll); |
af3fd140 | 215 | if (result) { |
6ccedb10 AS |
216 | printk(KERN_ERR PREFIX |
217 | "finish-write timeout, command = %d\n", command); | |
af3fd140 AS |
218 | goto end; |
219 | } | |
5d0c288b AS |
220 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
221 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 222 | } |
45bea155 | 223 | |
78d0af33 | 224 | for (; rdata_len > 0; --rdata_len) { |
00eb43a1 | 225 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count, force_poll); |
af3fd140 AS |
226 | if (result) { |
227 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
6ccedb10 | 228 | command); |
af3fd140 AS |
229 | goto end; |
230 | } | |
9e197219 | 231 | count = atomic_read(&ec->event_count); |
6ffb221a | 232 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 233 | } |
af3fd140 AS |
234 | end: |
235 | return result; | |
45bea155 LY |
236 | } |
237 | ||
3576cf61 | 238 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 239 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
240 | u8 * rdata, unsigned rdata_len, |
241 | int force_poll) | |
1da177e4 | 242 | { |
d7a76e4c | 243 | int status; |
50526df6 | 244 | u32 glk; |
1da177e4 | 245 | |
d7a76e4c | 246 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 247 | return -EINVAL; |
1da177e4 | 248 | |
6ccedb10 AS |
249 | if (rdata) |
250 | memset(rdata, 0, rdata_len); | |
1da177e4 | 251 | |
523953b4 | 252 | mutex_lock(&ec->lock); |
703959d4 | 253 | if (ec->global_lock) { |
1da177e4 | 254 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
255 | if (ACPI_FAILURE(status)) { |
256 | mutex_unlock(&ec->lock); | |
d550d98d | 257 | return -ENODEV; |
c24e912b | 258 | } |
1da177e4 | 259 | } |
451566f4 | 260 | |
5d57a6a5 | 261 | /* Make sure GPE is enabled before doing transaction */ |
a86e2772 | 262 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
5d57a6a5 | 263 | |
00eb43a1 | 264 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0, 0); |
716e084e | 265 | if (status) { |
4350933a | 266 | printk(KERN_ERR PREFIX |
6ccedb10 | 267 | "input buffer is not empty, aborting transaction\n"); |
451566f4 | 268 | goto end; |
716e084e | 269 | } |
1da177e4 | 270 | |
6ccedb10 AS |
271 | status = acpi_ec_transaction_unlocked(ec, command, |
272 | wdata, wdata_len, | |
00eb43a1 LP |
273 | rdata, rdata_len, |
274 | force_poll); | |
1da177e4 | 275 | |
6ccedb10 | 276 | end: |
1da177e4 | 277 | |
703959d4 | 278 | if (ec->global_lock) |
1da177e4 | 279 | acpi_release_global_lock(glk); |
523953b4 | 280 | mutex_unlock(&ec->lock); |
1da177e4 | 281 | |
d550d98d | 282 | return status; |
1da177e4 LT |
283 | } |
284 | ||
c45aac43 AS |
285 | /* |
286 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
287 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
288 | */ | |
289 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
290 | { | |
291 | u8 d; | |
00eb43a1 | 292 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
293 | } |
294 | ||
295 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
296 | { | |
00eb43a1 | 297 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
298 | } |
299 | ||
6ccedb10 | 300 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
301 | { |
302 | int result; | |
303 | u8 d; | |
304 | ||
305 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 306 | &address, 1, &d, 1, 0); |
3576cf61 DS |
307 | *data = d; |
308 | return result; | |
309 | } | |
6ffb221a | 310 | |
3576cf61 DS |
311 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
312 | { | |
6ccedb10 AS |
313 | u8 wdata[2] = { address, data }; |
314 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 315 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
316 | } |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Externally callable EC access functions. For now, assume 1 EC only | |
320 | */ | |
c45aac43 AS |
321 | int ec_burst_enable(void) |
322 | { | |
c45aac43 AS |
323 | if (!first_ec) |
324 | return -ENODEV; | |
d033879c | 325 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
326 | } |
327 | ||
328 | EXPORT_SYMBOL(ec_burst_enable); | |
329 | ||
330 | int ec_burst_disable(void) | |
331 | { | |
c45aac43 AS |
332 | if (!first_ec) |
333 | return -ENODEV; | |
d033879c | 334 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
335 | } |
336 | ||
337 | EXPORT_SYMBOL(ec_burst_disable); | |
338 | ||
6ccedb10 | 339 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 340 | { |
1da177e4 | 341 | int err; |
6ffb221a | 342 | u8 temp_data; |
1da177e4 LT |
343 | |
344 | if (!first_ec) | |
345 | return -ENODEV; | |
346 | ||
d033879c | 347 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
348 | |
349 | if (!err) { | |
350 | *val = temp_data; | |
351 | return 0; | |
50526df6 | 352 | } else |
1da177e4 LT |
353 | return err; |
354 | } | |
50526df6 | 355 | |
1da177e4 LT |
356 | EXPORT_SYMBOL(ec_read); |
357 | ||
50526df6 | 358 | int ec_write(u8 addr, u8 val) |
1da177e4 | 359 | { |
1da177e4 LT |
360 | int err; |
361 | ||
362 | if (!first_ec) | |
363 | return -ENODEV; | |
364 | ||
d033879c | 365 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
366 | |
367 | return err; | |
368 | } | |
50526df6 | 369 | |
1da177e4 LT |
370 | EXPORT_SYMBOL(ec_write); |
371 | ||
616362de | 372 | int ec_transaction(u8 command, |
9e197219 | 373 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
374 | u8 * rdata, unsigned rdata_len, |
375 | int force_poll) | |
45bea155 | 376 | { |
d7a76e4c LP |
377 | if (!first_ec) |
378 | return -ENODEV; | |
45bea155 | 379 | |
d033879c | 380 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
381 | wdata_len, rdata, rdata_len, |
382 | force_poll); | |
45bea155 | 383 | } |
1da177e4 | 384 | |
ab9e43c6 LP |
385 | EXPORT_SYMBOL(ec_transaction); |
386 | ||
6ccedb10 | 387 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
388 | { |
389 | int result; | |
6ccedb10 | 390 | u8 d; |
1da177e4 | 391 | |
6ccedb10 AS |
392 | if (!ec || !data) |
393 | return -EINVAL; | |
1da177e4 | 394 | |
6ccedb10 AS |
395 | /* |
396 | * Query the EC to find out which _Qxx method we need to evaluate. | |
397 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
398 | * bit to be cleared (and thus clearing the interrupt source). | |
399 | */ | |
716e084e | 400 | |
00eb43a1 | 401 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
402 | if (result) |
403 | return result; | |
1da177e4 | 404 | |
6ccedb10 AS |
405 | if (!d) |
406 | return -ENODATA; | |
1da177e4 | 407 | |
6ccedb10 AS |
408 | *data = d; |
409 | return 0; | |
1da177e4 LT |
410 | } |
411 | ||
1da177e4 LT |
412 | /* -------------------------------------------------------------------------- |
413 | Event Management | |
414 | -------------------------------------------------------------------------- */ | |
837012ed AS |
415 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
416 | acpi_handle handle, acpi_ec_query_func func, | |
417 | void *data) | |
418 | { | |
419 | struct acpi_ec_query_handler *handler = | |
420 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
421 | if (!handler) | |
422 | return -ENOMEM; | |
423 | ||
424 | handler->query_bit = query_bit; | |
425 | handler->handle = handle; | |
426 | handler->func = func; | |
427 | handler->data = data; | |
428 | mutex_lock(&ec->lock); | |
30c08574 | 429 | list_add(&handler->node, &ec->list); |
837012ed AS |
430 | mutex_unlock(&ec->lock); |
431 | return 0; | |
432 | } | |
433 | ||
434 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
435 | ||
436 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
437 | { | |
438 | struct acpi_ec_query_handler *handler; | |
439 | mutex_lock(&ec->lock); | |
440 | list_for_each_entry(handler, &ec->list, node) { | |
441 | if (query_bit == handler->query_bit) { | |
442 | list_del(&handler->node); | |
443 | kfree(handler); | |
837012ed AS |
444 | } |
445 | } | |
446 | mutex_unlock(&ec->lock); | |
447 | } | |
448 | ||
449 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 450 | |
50526df6 | 451 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 452 | { |
3d02b90b | 453 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 454 | u8 value = 0; |
837012ed | 455 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 456 | |
5d0c288b | 457 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 458 | return; |
837012ed AS |
459 | mutex_lock(&ec->lock); |
460 | list_for_each_entry(handler, &ec->list, node) { | |
461 | if (value == handler->query_bit) { | |
462 | /* have custom handler for this bit */ | |
463 | memcpy(©, handler, sizeof(copy)); | |
464 | mutex_unlock(&ec->lock); | |
465 | if (copy.func) { | |
466 | copy.func(copy.data); | |
467 | } else if (copy.handle) { | |
468 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
469 | } | |
470 | return; | |
471 | } | |
472 | } | |
473 | mutex_unlock(&ec->lock); | |
45bea155 | 474 | } |
1da177e4 | 475 | |
50526df6 | 476 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 477 | { |
50526df6 | 478 | acpi_status status = AE_OK; |
6ffb221a | 479 | u8 value; |
3d02b90b | 480 | struct acpi_ec *ec = data; |
00eb43a1 | 481 | |
9e197219 | 482 | atomic_inc(&ec->event_count); |
3d02b90b | 483 | |
8e0341ba | 484 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 485 | wake_up(&ec->wait); |
451566f4 DT |
486 | } |
487 | ||
bec5a1e0 | 488 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
489 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
490 | atomic_set(&ec->query_pending, 1); | |
6ccedb10 | 491 | status = |
837012ed | 492 | acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); |
50526df6 | 493 | } |
e41334c0 | 494 | |
451566f4 | 495 | return status == AE_OK ? |
50526df6 | 496 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
497 | } |
498 | ||
499 | /* -------------------------------------------------------------------------- | |
500 | Address Space Management | |
501 | -------------------------------------------------------------------------- */ | |
502 | ||
503 | static acpi_status | |
50526df6 LB |
504 | acpi_ec_space_setup(acpi_handle region_handle, |
505 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
506 | { |
507 | /* | |
508 | * The EC object is in the handler context and is needed | |
509 | * when calling the acpi_ec_space_handler. | |
510 | */ | |
50526df6 LB |
511 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
512 | handler_context : NULL; | |
1da177e4 LT |
513 | |
514 | return AE_OK; | |
515 | } | |
516 | ||
1da177e4 | 517 | static acpi_status |
5b7734b4 AS |
518 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
519 | u32 bits, acpi_integer *value, | |
50526df6 | 520 | void *handler_context, void *region_context) |
1da177e4 | 521 | { |
3d02b90b | 522 | struct acpi_ec *ec = handler_context; |
5b7734b4 AS |
523 | int result = 0, i = 0; |
524 | u8 temp = 0; | |
1da177e4 | 525 | |
1da177e4 | 526 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 527 | return AE_BAD_PARAMETER; |
1da177e4 | 528 | |
5b7734b4 | 529 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 530 | return AE_BAD_PARAMETER; |
1da177e4 | 531 | |
5b7734b4 AS |
532 | if (bits != 8 && acpi_strict) |
533 | return AE_BAD_PARAMETER; | |
1da177e4 | 534 | |
5b7734b4 AS |
535 | while (bits - i > 0) { |
536 | if (function == ACPI_READ) { | |
537 | result = acpi_ec_read(ec, address, &temp); | |
538 | (*value) |= ((acpi_integer)temp) << i; | |
539 | } else { | |
540 | temp = 0xff & ((*value) >> i); | |
541 | result = acpi_ec_write(ec, address, temp); | |
542 | } | |
543 | i += 8; | |
544 | ++address; | |
1da177e4 LT |
545 | } |
546 | ||
1da177e4 LT |
547 | switch (result) { |
548 | case -EINVAL: | |
d550d98d | 549 | return AE_BAD_PARAMETER; |
1da177e4 LT |
550 | break; |
551 | case -ENODEV: | |
d550d98d | 552 | return AE_NOT_FOUND; |
1da177e4 LT |
553 | break; |
554 | case -ETIME: | |
d550d98d | 555 | return AE_TIME; |
1da177e4 LT |
556 | break; |
557 | default: | |
d550d98d | 558 | return AE_OK; |
1da177e4 | 559 | } |
1da177e4 LT |
560 | } |
561 | ||
1da177e4 LT |
562 | /* -------------------------------------------------------------------------- |
563 | FS Interface (/proc) | |
564 | -------------------------------------------------------------------------- */ | |
565 | ||
50526df6 | 566 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 567 | |
50526df6 | 568 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 569 | { |
3d02b90b | 570 | struct acpi_ec *ec = seq->private; |
1da177e4 | 571 | |
1da177e4 LT |
572 | if (!ec) |
573 | goto end; | |
574 | ||
01f22462 AS |
575 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
576 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
577 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
578 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 579 | ec->global_lock ? "yes" : "no"); |
50526df6 | 580 | end: |
d550d98d | 581 | return 0; |
1da177e4 LT |
582 | } |
583 | ||
584 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
585 | { | |
586 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
587 | } | |
588 | ||
703959d4 | 589 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
590 | .open = acpi_ec_info_open_fs, |
591 | .read = seq_read, | |
592 | .llseek = seq_lseek, | |
593 | .release = single_release, | |
1da177e4 LT |
594 | .owner = THIS_MODULE, |
595 | }; | |
596 | ||
50526df6 | 597 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 598 | { |
50526df6 | 599 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 600 | |
1da177e4 LT |
601 | if (!acpi_device_dir(device)) { |
602 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 603 | acpi_ec_dir); |
1da177e4 | 604 | if (!acpi_device_dir(device)) |
d550d98d | 605 | return -ENODEV; |
1da177e4 LT |
606 | } |
607 | ||
608 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 609 | acpi_device_dir(device)); |
1da177e4 | 610 | if (!entry) |
d550d98d | 611 | return -ENODEV; |
1da177e4 LT |
612 | else { |
613 | entry->proc_fops = &acpi_ec_info_ops; | |
614 | entry->data = acpi_driver_data(device); | |
615 | entry->owner = THIS_MODULE; | |
616 | } | |
617 | ||
d550d98d | 618 | return 0; |
1da177e4 LT |
619 | } |
620 | ||
50526df6 | 621 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 622 | { |
1da177e4 LT |
623 | |
624 | if (acpi_device_dir(device)) { | |
625 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
626 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
627 | acpi_device_dir(device) = NULL; | |
628 | } | |
629 | ||
d550d98d | 630 | return 0; |
1da177e4 LT |
631 | } |
632 | ||
1da177e4 LT |
633 | /* -------------------------------------------------------------------------- |
634 | Driver Interface | |
635 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
636 | static acpi_status |
637 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
638 | ||
c0900c35 AS |
639 | static struct acpi_ec *make_acpi_ec(void) |
640 | { | |
641 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
642 | if (!ec) | |
643 | return NULL; | |
644 | ||
9fd9f8e8 | 645 | atomic_set(&ec->query_pending, 1); |
c0900c35 AS |
646 | atomic_set(&ec->event_count, 1); |
647 | mutex_init(&ec->lock); | |
648 | init_waitqueue_head(&ec->wait); | |
837012ed | 649 | INIT_LIST_HEAD(&ec->list); |
c0900c35 AS |
650 | |
651 | return ec; | |
652 | } | |
837012ed | 653 | |
c019b193 AS |
654 | static acpi_status |
655 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
656 | void *context, void **return_value) | |
657 | { | |
658 | struct acpi_namespace_node *node = handle; | |
659 | struct acpi_ec *ec = context; | |
660 | int value = 0; | |
661 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
662 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
663 | } | |
664 | return AE_OK; | |
665 | } | |
666 | ||
cd8c93a4 AS |
667 | static acpi_status |
668 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 669 | { |
cd8c93a4 AS |
670 | acpi_status status; |
671 | ||
672 | struct acpi_ec *ec = context; | |
673 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
674 | ec_parse_io_ports, ec); | |
675 | if (ACPI_FAILURE(status)) | |
676 | return status; | |
837012ed AS |
677 | |
678 | /* Get GPE bit assignment (EC events). */ | |
679 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
680 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
681 | if (ACPI_FAILURE(status)) | |
682 | return status; | |
c019b193 AS |
683 | /* Find and register all query methods */ |
684 | acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, | |
685 | acpi_ec_register_query_methods, ec, NULL); | |
837012ed AS |
686 | /* Use the global lock for all EC transactions? */ |
687 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 688 | ec->handle = handle; |
cd8c93a4 | 689 | return AE_CTRL_TERMINATE; |
837012ed AS |
690 | } |
691 | ||
4c611060 AS |
692 | static void ec_remove_handlers(struct acpi_ec *ec) |
693 | { | |
694 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
695 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
696 | printk(KERN_ERR PREFIX "failed to remove space handler\n"); | |
697 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
698 | &acpi_ec_gpe_handler))) | |
699 | printk(KERN_ERR PREFIX "failed to remove gpe handler\n"); | |
700 | ec->handlers_installed = 0; | |
701 | } | |
702 | ||
703959d4 | 703 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 704 | { |
703959d4 | 705 | struct acpi_ec *ec = NULL; |
45bea155 | 706 | |
45bea155 | 707 | if (!device) |
d550d98d | 708 | return -EINVAL; |
c0900c35 AS |
709 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
710 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
711 | ||
4c611060 AS |
712 | /* Check for boot EC */ |
713 | if (boot_ec) { | |
714 | if (boot_ec->handle == device->handle) { | |
715 | /* Pre-loaded EC from DSDT, just move pointer */ | |
716 | ec = boot_ec; | |
717 | boot_ec = NULL; | |
718 | goto end; | |
719 | } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { | |
720 | /* ECDT-based EC, time to shut it down */ | |
721 | ec_remove_handlers(boot_ec); | |
722 | kfree(boot_ec); | |
723 | first_ec = boot_ec = NULL; | |
724 | } | |
725 | } | |
726 | ||
c0900c35 | 727 | ec = make_acpi_ec(); |
45bea155 | 728 | if (!ec) |
d550d98d | 729 | return -ENOMEM; |
703959d4 | 730 | |
cd8c93a4 AS |
731 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
732 | AE_CTRL_TERMINATE) { | |
c0900c35 AS |
733 | kfree(ec); |
734 | return -EINVAL; | |
45bea155 | 735 | } |
c0900c35 | 736 | ec->handle = device->handle; |
4c611060 AS |
737 | end: |
738 | if (!first_ec) | |
739 | first_ec = ec; | |
c0900c35 | 740 | acpi_driver_data(device) = ec; |
c0900c35 | 741 | acpi_ec_add_fs(device); |
4c611060 AS |
742 | printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
743 | ec->gpe, ec->command_addr, ec->data_addr); | |
c0900c35 | 744 | return 0; |
1da177e4 LT |
745 | } |
746 | ||
50526df6 | 747 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 748 | { |
01f22462 | 749 | struct acpi_ec *ec; |
07ddf768 | 750 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 751 | |
1da177e4 | 752 | if (!device) |
d550d98d | 753 | return -EINVAL; |
1da177e4 LT |
754 | |
755 | ec = acpi_driver_data(device); | |
837012ed | 756 | mutex_lock(&ec->lock); |
07ddf768 | 757 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
758 | list_del(&handler->node); |
759 | kfree(handler); | |
760 | } | |
761 | mutex_unlock(&ec->lock); | |
1da177e4 | 762 | acpi_ec_remove_fs(device); |
c0900c35 | 763 | acpi_driver_data(device) = NULL; |
d033879c | 764 | if (ec == first_ec) |
c0900c35 | 765 | first_ec = NULL; |
4c611060 | 766 | kfree(ec); |
d550d98d | 767 | return 0; |
1da177e4 LT |
768 | } |
769 | ||
1da177e4 | 770 | static acpi_status |
c0900c35 | 771 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 772 | { |
3d02b90b | 773 | struct acpi_ec *ec = context; |
1da177e4 | 774 | |
01f22462 | 775 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 776 | return AE_OK; |
1da177e4 LT |
777 | |
778 | /* | |
779 | * The first address region returned is the data port, and | |
780 | * the second address region returned is the status/command | |
781 | * port. | |
782 | */ | |
01f22462 | 783 | if (ec->data_addr == 0) |
6ffb221a | 784 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 785 | else if (ec->command_addr == 0) |
6ffb221a | 786 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 787 | else |
1da177e4 | 788 | return AE_CTRL_TERMINATE; |
1da177e4 | 789 | |
1da177e4 LT |
790 | return AE_OK; |
791 | } | |
792 | ||
e8284321 AS |
793 | static int ec_install_handlers(struct acpi_ec *ec) |
794 | { | |
c0900c35 | 795 | acpi_status status; |
4c611060 AS |
796 | if (ec->handlers_installed) |
797 | return 0; | |
c0900c35 AS |
798 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
799 | ACPI_GPE_EDGE_TRIGGERED, | |
800 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
801 | if (ACPI_FAILURE(status)) |
802 | return -ENODEV; | |
01f22462 | 803 | |
e8284321 AS |
804 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
805 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
806 | ||
807 | status = acpi_install_address_space_handler(ec->handle, | |
808 | ACPI_ADR_SPACE_EC, | |
809 | &acpi_ec_space_handler, | |
810 | &acpi_ec_space_setup, ec); | |
811 | if (ACPI_FAILURE(status)) { | |
812 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
813 | return -ENODEV; | |
814 | } | |
815 | ||
4c611060 | 816 | ec->handlers_installed = 1; |
e8284321 AS |
817 | return 0; |
818 | } | |
819 | ||
50526df6 | 820 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 821 | { |
c0900c35 | 822 | struct acpi_ec *ec; |
837012ed | 823 | int ret = 0; |
1da177e4 | 824 | |
1da177e4 | 825 | if (!device) |
d550d98d | 826 | return -EINVAL; |
1da177e4 LT |
827 | |
828 | ec = acpi_driver_data(device); | |
829 | ||
830 | if (!ec) | |
d550d98d | 831 | return -EINVAL; |
1da177e4 | 832 | |
4c611060 | 833 | ret = ec_install_handlers(ec); |
837012ed AS |
834 | |
835 | /* EC is fully operational, allow queries */ | |
836 | atomic_set(&ec->query_pending, 0); | |
837012ed | 837 | return ret; |
1da177e4 LT |
838 | } |
839 | ||
50526df6 | 840 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 841 | { |
c0900c35 | 842 | struct acpi_ec *ec; |
1da177e4 | 843 | if (!device) |
d550d98d | 844 | return -EINVAL; |
1da177e4 | 845 | ec = acpi_driver_data(device); |
c0900c35 AS |
846 | if (!ec) |
847 | return -EINVAL; | |
4c611060 | 848 | ec_remove_handlers(ec); |
f9319f90 | 849 | |
d550d98d | 850 | return 0; |
1da177e4 LT |
851 | } |
852 | ||
c0900c35 AS |
853 | int __init acpi_ec_ecdt_probe(void) |
854 | { | |
855 | int ret; | |
856 | acpi_status status; | |
50526df6 | 857 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 858 | |
d66d969d AS |
859 | boot_ec = make_acpi_ec(); |
860 | if (!boot_ec) | |
c0900c35 AS |
861 | return -ENOMEM; |
862 | /* | |
863 | * Generate a boot ec context | |
864 | */ | |
15a58ed1 AS |
865 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
866 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 867 | if (ACPI_SUCCESS(status)) { |
4c611060 | 868 | printk(KERN_INFO PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
869 | boot_ec->command_addr = ecdt_ptr->control.address; |
870 | boot_ec->data_addr = ecdt_ptr->data.address; | |
871 | boot_ec->gpe = ecdt_ptr->gpe; | |
872 | boot_ec->handle = ACPI_ROOT_OBJECT; | |
873 | } else { | |
874 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); | |
875 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
876 | boot_ec, NULL); | |
2d8348b4 AS |
877 | /* Check that acpi_get_devices actually find something */ |
878 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 AS |
879 | goto error; |
880 | } | |
1da177e4 | 881 | |
d66d969d | 882 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
883 | if (!ret) { |
884 | first_ec = boot_ec; | |
e8284321 | 885 | return 0; |
d033879c | 886 | } |
c0900c35 | 887 | error: |
d66d969d AS |
888 | kfree(boot_ec); |
889 | boot_ec = NULL; | |
1da177e4 LT |
890 | return -ENODEV; |
891 | } | |
892 | ||
50526df6 | 893 | static int __init acpi_ec_init(void) |
1da177e4 | 894 | { |
50526df6 | 895 | int result = 0; |
1da177e4 | 896 | |
1da177e4 | 897 | if (acpi_disabled) |
d550d98d | 898 | return 0; |
1da177e4 LT |
899 | |
900 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
901 | if (!acpi_ec_dir) | |
d550d98d | 902 | return -ENODEV; |
1da177e4 LT |
903 | |
904 | /* Now register the driver for the EC */ | |
905 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
906 | if (result < 0) { | |
907 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 908 | return -ENODEV; |
1da177e4 LT |
909 | } |
910 | ||
d550d98d | 911 | return result; |
1da177e4 LT |
912 | } |
913 | ||
914 | subsys_initcall(acpi_ec_init); | |
915 | ||
916 | /* EC driver currently not unloadable */ | |
917 | #if 0 | |
50526df6 | 918 | static void __exit acpi_ec_exit(void) |
1da177e4 | 919 | { |
1da177e4 LT |
920 | |
921 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
922 | ||
923 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
924 | ||
d550d98d | 925 | return; |
1da177e4 | 926 | } |
50526df6 | 927 | #endif /* 0 */ |
1da177e4 | 928 | |
02b28a33 | 929 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 930 | { |
02b28a33 | 931 | int intr; |
7b15f5e7 | 932 | |
02b28a33 | 933 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
934 | return 0; |
935 | ||
c0900c35 AS |
936 | acpi_ec_mode = (intr) ? EC_INTR : EC_POLL; |
937 | ||
9e197219 | 938 | printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling"); |
703959d4 | 939 | |
9b41046c | 940 | return 1; |
45bea155 | 941 | } |
50526df6 | 942 | |
53f11d4f | 943 | __setup("ec_intr=", acpi_ec_set_intr_mode); |