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1da177e4 LT |
1 | /* |
2 | * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $) | |
3 | * | |
4 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or (at | |
13 | * your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
23 | * | |
24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
25 | */ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <linux/seq_file.h> | |
451566f4 | 34 | #include <linux/interrupt.h> |
1da177e4 LT |
35 | #include <asm/io.h> |
36 | #include <acpi/acpi_bus.h> | |
37 | #include <acpi/acpi_drivers.h> | |
38 | #include <acpi/actypes.h> | |
39 | ||
40 | #define _COMPONENT ACPI_EC_COMPONENT | |
41 | ACPI_MODULE_NAME ("acpi_ec") | |
42 | ||
43 | #define ACPI_EC_COMPONENT 0x00100000 | |
44 | #define ACPI_EC_CLASS "embedded_controller" | |
45 | #define ACPI_EC_HID "PNP0C09" | |
46 | #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" | |
47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" | |
48 | #define ACPI_EC_FILE_INFO "info" | |
49 | ||
50 | ||
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 LT |
54 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
55 | ||
56 | #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */ | |
57 | #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */ | |
58 | ||
451566f4 | 59 | #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ |
1da177e4 LT |
60 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
61 | ||
62 | #define ACPI_EC_COMMAND_READ 0x80 | |
63 | #define ACPI_EC_COMMAND_WRITE 0x81 | |
451566f4 DT |
64 | #define ACPI_EC_BURST_ENABLE 0x82 |
65 | #define ACPI_EC_BURST_DISABLE 0x83 | |
1da177e4 LT |
66 | #define ACPI_EC_COMMAND_QUERY 0x84 |
67 | ||
68 | static int acpi_ec_add (struct acpi_device *device); | |
69 | static int acpi_ec_remove (struct acpi_device *device, int type); | |
70 | static int acpi_ec_start (struct acpi_device *device); | |
71 | static int acpi_ec_stop (struct acpi_device *device, int type); | |
72 | ||
73 | static struct acpi_driver acpi_ec_driver = { | |
74 | .name = ACPI_EC_DRIVER_NAME, | |
75 | .class = ACPI_EC_CLASS, | |
76 | .ids = ACPI_EC_HID, | |
77 | .ops = { | |
78 | .add = acpi_ec_add, | |
79 | .remove = acpi_ec_remove, | |
80 | .start = acpi_ec_start, | |
81 | .stop = acpi_ec_stop, | |
82 | }, | |
83 | }; | |
84 | ||
85 | struct acpi_ec { | |
86 | acpi_handle handle; | |
87 | unsigned long uid; | |
88 | unsigned long gpe_bit; | |
89 | struct acpi_generic_address status_addr; | |
90 | struct acpi_generic_address command_addr; | |
91 | struct acpi_generic_address data_addr; | |
92 | unsigned long global_lock; | |
451566f4 DT |
93 | unsigned int expect_event; |
94 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/ | |
95 | atomic_t pending_gpe; | |
96 | struct semaphore sem; | |
97 | wait_queue_head_t wait; | |
1da177e4 LT |
98 | }; |
99 | ||
100 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
101 | static struct acpi_ec *ec_ecdt; | |
102 | ||
103 | /* External interfaces use first EC only, so remember */ | |
104 | static struct acpi_device *first_ec; | |
105 | ||
106 | /* -------------------------------------------------------------------------- | |
107 | Transaction Management | |
108 | -------------------------------------------------------------------------- */ | |
109 | ||
451566f4 | 110 | static inline u32 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 111 | { |
451566f4 | 112 | u32 status = 0; |
1da177e4 | 113 | |
451566f4 DT |
114 | acpi_hw_low_level_read(8, &status, &ec->status_addr); |
115 | return status; | |
116 | } | |
117 | ||
118 | static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event) | |
119 | { | |
120 | int result = 0; | |
121 | ||
122 | ACPI_FUNCTION_TRACE("acpi_ec_wait"); | |
1da177e4 | 123 | |
451566f4 DT |
124 | ec->expect_event = event; |
125 | smp_mb(); | |
126 | ||
127 | result = wait_event_interruptible_timeout(ec->wait, | |
128 | !ec->expect_event, | |
129 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
130 | ||
131 | ec->expect_event = 0; | |
132 | smp_mb(); | |
133 | ||
134 | if (result < 0){ | |
135 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result)); | |
136 | return_VALUE(result); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Verify that the event in question has actually happened by | |
141 | * querying EC status. Do the check even if operation timed-out | |
142 | * to make sure that we did not miss interrupt. | |
143 | */ | |
1da177e4 LT |
144 | switch (event) { |
145 | case ACPI_EC_EVENT_OBF: | |
451566f4 DT |
146 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
147 | return_VALUE(0); | |
1da177e4 | 148 | break; |
451566f4 | 149 | |
1da177e4 | 150 | case ACPI_EC_EVENT_IBE: |
451566f4 DT |
151 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
152 | return_VALUE(0); | |
1da177e4 | 153 | break; |
1da177e4 LT |
154 | } |
155 | ||
451566f4 | 156 | return_VALUE(-ETIME); |
1da177e4 LT |
157 | } |
158 | ||
159 | ||
451566f4 DT |
160 | |
161 | static int | |
162 | acpi_ec_enter_burst_mode ( | |
163 | struct acpi_ec *ec) | |
164 | { | |
165 | u32 tmp = 0; | |
166 | int status = 0; | |
167 | ||
168 | ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode"); | |
169 | ||
170 | status = acpi_ec_read_status(ec); | |
171 | if (status != -EINVAL && | |
172 | !(status & ACPI_EC_FLAG_BURST)){ | |
451566f4 DT |
173 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); |
174 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
175 | if (status){ | |
176 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
451566f4 DT |
177 | return_VALUE(-EINVAL); |
178 | } | |
179 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
180 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
181 | if(tmp != 0x90 ) {/* Burst ACK byte*/ | |
451566f4 DT |
182 | return_VALUE(-EINVAL); |
183 | } | |
668d74c0 LY |
184 | } |
185 | ||
451566f4 DT |
186 | atomic_set(&ec->leaving_burst , 0); |
187 | return_VALUE(0); | |
188 | } | |
189 | ||
190 | static int | |
191 | acpi_ec_leave_burst_mode ( | |
192 | struct acpi_ec *ec) | |
193 | { | |
194 | int status =0; | |
195 | ||
196 | ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); | |
197 | ||
198 | atomic_set(&ec->leaving_burst , 1); | |
199 | status = acpi_ec_read_status(ec); | |
200 | if (status != -EINVAL && | |
201 | (status & ACPI_EC_FLAG_BURST)){ | |
451566f4 DT |
202 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr); |
203 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
204 | if (status){ | |
205 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
206 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n")); | |
207 | return_VALUE(-EINVAL); | |
208 | } | |
209 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
210 | status = acpi_ec_read_status(ec); | |
668d74c0 | 211 | } |
451566f4 DT |
212 | |
213 | return_VALUE(0); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | static int |
217 | acpi_ec_read ( | |
218 | struct acpi_ec *ec, | |
219 | u8 address, | |
220 | u32 *data) | |
221 | { | |
451566f4 DT |
222 | int status = 0; |
223 | u32 glk; | |
1da177e4 LT |
224 | |
225 | ACPI_FUNCTION_TRACE("acpi_ec_read"); | |
226 | ||
227 | if (!ec || !data) | |
228 | return_VALUE(-EINVAL); | |
229 | ||
451566f4 | 230 | retry: |
1da177e4 LT |
231 | *data = 0; |
232 | ||
233 | if (ec->global_lock) { | |
234 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
235 | if (ACPI_FAILURE(status)) | |
236 | return_VALUE(-ENODEV); | |
237 | } | |
451566f4 DT |
238 | |
239 | WARN_ON(in_interrupt()); | |
240 | down(&ec->sem); | |
241 | ||
242 | if(acpi_ec_enter_burst_mode(ec)) | |
243 | goto end; | |
1da177e4 LT |
244 | |
245 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr); | |
451566f4 DT |
246 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
247 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
248 | if (status) { | |
1da177e4 | 249 | goto end; |
451566f4 | 250 | } |
1da177e4 LT |
251 | |
252 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
253 | status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
254 | if (status){ | |
255 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 256 | goto end; |
451566f4 | 257 | } |
1da177e4 LT |
258 | |
259 | acpi_hw_low_level_read(8, data, &ec->data_addr); | |
451566f4 | 260 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 LT |
261 | |
262 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", | |
263 | *data, address)); | |
451566f4 | 264 | |
1da177e4 | 265 | end: |
451566f4 DT |
266 | acpi_ec_leave_burst_mode(ec); |
267 | up(&ec->sem); | |
1da177e4 LT |
268 | |
269 | if (ec->global_lock) | |
270 | acpi_release_global_lock(glk); | |
271 | ||
451566f4 DT |
272 | if(atomic_read(&ec->leaving_burst) == 2){ |
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
17e9c78a | 274 | while(atomic_read(&ec->pending_gpe)){ |
451566f4 DT |
275 | msleep(1); |
276 | } | |
277 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
278 | goto retry; | |
279 | } | |
280 | ||
281 | return_VALUE(status); | |
1da177e4 LT |
282 | } |
283 | ||
284 | ||
285 | static int | |
286 | acpi_ec_write ( | |
287 | struct acpi_ec *ec, | |
288 | u8 address, | |
289 | u8 data) | |
290 | { | |
451566f4 DT |
291 | int status = 0; |
292 | u32 glk; | |
293 | u32 tmp; | |
1da177e4 LT |
294 | |
295 | ACPI_FUNCTION_TRACE("acpi_ec_write"); | |
296 | ||
297 | if (!ec) | |
298 | return_VALUE(-EINVAL); | |
451566f4 | 299 | retry: |
1da177e4 LT |
300 | if (ec->global_lock) { |
301 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
302 | if (ACPI_FAILURE(status)) | |
303 | return_VALUE(-ENODEV); | |
304 | } | |
305 | ||
451566f4 DT |
306 | WARN_ON(in_interrupt()); |
307 | down(&ec->sem); | |
308 | ||
309 | if(acpi_ec_enter_burst_mode(ec)) | |
310 | goto end; | |
311 | ||
312 | status = acpi_ec_read_status(ec); | |
313 | if (status != -EINVAL && | |
314 | !(status & ACPI_EC_FLAG_BURST)){ | |
315 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); | |
316 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
317 | if (status) | |
318 | goto end; | |
319 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
320 | if(tmp != 0x90 ) /* Burst ACK byte*/ | |
321 | goto end; | |
322 | } | |
323 | /*Now we are in burst mode*/ | |
1da177e4 LT |
324 | |
325 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr); | |
451566f4 DT |
326 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
327 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
328 | if (status){ | |
1da177e4 | 329 | goto end; |
451566f4 | 330 | } |
1da177e4 LT |
331 | |
332 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
333 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
334 | if (status){ | |
335 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 336 | goto end; |
451566f4 | 337 | } |
1da177e4 LT |
338 | |
339 | acpi_hw_low_level_write(8, data, &ec->data_addr); | |
451566f4 DT |
340 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
341 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
342 | if (status) | |
1da177e4 LT |
343 | goto end; |
344 | ||
345 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
346 | data, address)); | |
347 | ||
348 | end: | |
451566f4 DT |
349 | acpi_ec_leave_burst_mode(ec); |
350 | up(&ec->sem); | |
1da177e4 LT |
351 | |
352 | if (ec->global_lock) | |
353 | acpi_release_global_lock(glk); | |
354 | ||
451566f4 DT |
355 | if(atomic_read(&ec->leaving_burst) == 2){ |
356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
17e9c78a | 357 | while(atomic_read(&ec->pending_gpe)){ |
451566f4 DT |
358 | msleep(1); |
359 | } | |
360 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
361 | goto retry; | |
362 | } | |
363 | ||
364 | return_VALUE(status); | |
1da177e4 LT |
365 | } |
366 | ||
367 | /* | |
368 | * Externally callable EC access functions. For now, assume 1 EC only | |
369 | */ | |
370 | int | |
371 | ec_read(u8 addr, u8 *val) | |
372 | { | |
373 | struct acpi_ec *ec; | |
374 | int err; | |
375 | u32 temp_data; | |
376 | ||
377 | if (!first_ec) | |
378 | return -ENODEV; | |
379 | ||
380 | ec = acpi_driver_data(first_ec); | |
381 | ||
382 | err = acpi_ec_read(ec, addr, &temp_data); | |
383 | ||
384 | if (!err) { | |
385 | *val = temp_data; | |
386 | return 0; | |
387 | } | |
388 | else | |
389 | return err; | |
390 | } | |
391 | EXPORT_SYMBOL(ec_read); | |
392 | ||
393 | int | |
394 | ec_write(u8 addr, u8 val) | |
395 | { | |
396 | struct acpi_ec *ec; | |
397 | int err; | |
398 | ||
399 | if (!first_ec) | |
400 | return -ENODEV; | |
401 | ||
402 | ec = acpi_driver_data(first_ec); | |
403 | ||
404 | err = acpi_ec_write(ec, addr, val); | |
405 | ||
406 | return err; | |
407 | } | |
408 | EXPORT_SYMBOL(ec_write); | |
409 | ||
410 | ||
411 | static int | |
412 | acpi_ec_query ( | |
413 | struct acpi_ec *ec, | |
414 | u32 *data) | |
415 | { | |
451566f4 DT |
416 | int status = 0; |
417 | u32 glk; | |
1da177e4 LT |
418 | |
419 | ACPI_FUNCTION_TRACE("acpi_ec_query"); | |
420 | ||
421 | if (!ec || !data) | |
422 | return_VALUE(-EINVAL); | |
1da177e4 LT |
423 | *data = 0; |
424 | ||
425 | if (ec->global_lock) { | |
426 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
427 | if (ACPI_FAILURE(status)) | |
428 | return_VALUE(-ENODEV); | |
429 | } | |
430 | ||
451566f4 DT |
431 | down(&ec->sem); |
432 | if(acpi_ec_enter_burst_mode(ec)) | |
433 | goto end; | |
1da177e4 LT |
434 | /* |
435 | * Query the EC to find out which _Qxx method we need to evaluate. | |
436 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
437 | * bit to be cleared (and thus clearing the interrupt source). | |
438 | */ | |
1da177e4 | 439 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr); |
451566f4 DT |
440 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
441 | if (status){ | |
442 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 443 | goto end; |
451566f4 DT |
444 | } |
445 | ||
1da177e4 | 446 | acpi_hw_low_level_read(8, data, &ec->data_addr); |
451566f4 | 447 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 448 | if (!*data) |
451566f4 | 449 | status = -ENODATA; |
1da177e4 LT |
450 | |
451 | end: | |
451566f4 DT |
452 | acpi_ec_leave_burst_mode(ec); |
453 | up(&ec->sem); | |
1da177e4 LT |
454 | |
455 | if (ec->global_lock) | |
456 | acpi_release_global_lock(glk); | |
457 | ||
451566f4 DT |
458 | if(atomic_read(&ec->leaving_burst) == 2){ |
459 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
451566f4 | 460 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
17e9c78a | 461 | status = -ENODATA; |
451566f4 | 462 | } |
451566f4 | 463 | return_VALUE(status); |
1da177e4 LT |
464 | } |
465 | ||
466 | ||
467 | /* -------------------------------------------------------------------------- | |
468 | Event Management | |
469 | -------------------------------------------------------------------------- */ | |
470 | ||
471 | struct acpi_ec_query_data { | |
472 | acpi_handle handle; | |
473 | u8 data; | |
474 | }; | |
475 | ||
476 | static void | |
477 | acpi_ec_gpe_query ( | |
478 | void *ec_cxt) | |
479 | { | |
480 | struct acpi_ec *ec = (struct acpi_ec *) ec_cxt; | |
451566f4 DT |
481 | u32 value; |
482 | int result = -ENODATA; | |
1da177e4 LT |
483 | static char object_name[5] = {'_','Q','0','0','\0'}; |
484 | const char hex[] = {'0','1','2','3','4','5','6','7', | |
485 | '8','9','A','B','C','D','E','F'}; | |
486 | ||
487 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); | |
488 | ||
451566f4 DT |
489 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
490 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 491 | |
451566f4 | 492 | if (result) |
1da177e4 LT |
493 | goto end; |
494 | ||
1da177e4 LT |
495 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
496 | object_name[3] = hex[(value & 0x0F)]; | |
497 | ||
498 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
499 | ||
500 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); | |
451566f4 | 501 | end: |
17e9c78a | 502 | atomic_dec(&ec->pending_gpe); |
451566f4 | 503 | return; |
1da177e4 LT |
504 | } |
505 | ||
506 | static u32 | |
507 | acpi_ec_gpe_handler ( | |
508 | void *data) | |
509 | { | |
510 | acpi_status status = AE_OK; | |
451566f4 | 511 | u32 value; |
1da177e4 LT |
512 | struct acpi_ec *ec = (struct acpi_ec *) data; |
513 | ||
514 | if (!ec) | |
515 | return ACPI_INTERRUPT_NOT_HANDLED; | |
516 | ||
517 | acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); | |
518 | ||
451566f4 | 519 | value = acpi_ec_read_status(ec); |
1da177e4 | 520 | |
451566f4 DT |
521 | if((value & ACPI_EC_FLAG_IBF) && |
522 | !(value & ACPI_EC_FLAG_BURST) && | |
523 | (atomic_read(&ec->leaving_burst) == 0)) { | |
524 | /* | |
525 | * the embedded controller disables | |
526 | * burst mode for any reason other | |
527 | * than the burst disable command | |
528 | * to process critical event. | |
529 | */ | |
530 | atomic_set(&ec->leaving_burst , 2); /* block current pending transaction | |
531 | and retry */ | |
532 | wake_up(&ec->wait); | |
533 | }else { | |
534 | if ((ec->expect_event == ACPI_EC_EVENT_OBF && | |
535 | (value & ACPI_EC_FLAG_OBF)) || | |
536 | (ec->expect_event == ACPI_EC_EVENT_IBE && | |
537 | !(value & ACPI_EC_FLAG_IBF))) { | |
538 | ec->expect_event = 0; | |
539 | wake_up(&ec->wait); | |
17e9c78a | 540 | return ACPI_INTERRUPT_HANDLED; |
451566f4 DT |
541 | } |
542 | } | |
543 | ||
544 | if (value & ACPI_EC_FLAG_SCI){ | |
545 | atomic_add(1, &ec->pending_gpe) ; | |
546 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, | |
547 | acpi_ec_gpe_query, ec); | |
17e9c78a LY |
548 | return status == AE_OK ? |
549 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; | |
451566f4 | 550 | } |
17e9c78a | 551 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 DT |
552 | return status == AE_OK ? |
553 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; | |
1da177e4 LT |
554 | } |
555 | ||
556 | /* -------------------------------------------------------------------------- | |
557 | Address Space Management | |
558 | -------------------------------------------------------------------------- */ | |
559 | ||
560 | static acpi_status | |
561 | acpi_ec_space_setup ( | |
562 | acpi_handle region_handle, | |
563 | u32 function, | |
564 | void *handler_context, | |
565 | void **return_context) | |
566 | { | |
567 | /* | |
568 | * The EC object is in the handler context and is needed | |
569 | * when calling the acpi_ec_space_handler. | |
570 | */ | |
451566f4 DT |
571 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
572 | handler_context : NULL; | |
1da177e4 LT |
573 | |
574 | return AE_OK; | |
575 | } | |
576 | ||
577 | ||
578 | static acpi_status | |
579 | acpi_ec_space_handler ( | |
580 | u32 function, | |
581 | acpi_physical_address address, | |
582 | u32 bit_width, | |
583 | acpi_integer *value, | |
584 | void *handler_context, | |
585 | void *region_context) | |
586 | { | |
587 | int result = 0; | |
588 | struct acpi_ec *ec = NULL; | |
fa9cd547 | 589 | u64 temp = *value; |
1da177e4 LT |
590 | acpi_integer f_v = 0; |
591 | int i = 0; | |
592 | ||
593 | ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); | |
594 | ||
595 | if ((address > 0xFF) || !value || !handler_context) | |
596 | return_VALUE(AE_BAD_PARAMETER); | |
597 | ||
fa9cd547 | 598 | if (bit_width != 8 && acpi_strict) { |
1da177e4 | 599 | printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n"); |
fa9cd547 | 600 | return_VALUE(AE_BAD_PARAMETER); |
1da177e4 LT |
601 | } |
602 | ||
603 | ec = (struct acpi_ec *) handler_context; | |
604 | ||
605 | next_byte: | |
606 | switch (function) { | |
607 | case ACPI_READ: | |
fa9cd547 LY |
608 | temp = 0; |
609 | result = acpi_ec_read(ec, (u8) address, (u32 *)&temp); | |
1da177e4 LT |
610 | break; |
611 | case ACPI_WRITE: | |
fa9cd547 | 612 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
613 | break; |
614 | default: | |
615 | result = -EINVAL; | |
616 | goto out; | |
617 | break; | |
618 | } | |
619 | ||
620 | bit_width -= 8; | |
fa9cd547 LY |
621 | if (bit_width) { |
622 | if (function == ACPI_READ) | |
623 | f_v |= temp << 8 * i; | |
624 | if (function == ACPI_WRITE) | |
625 | temp >>= 8; | |
1da177e4 | 626 | i++; |
83ea7445 | 627 | address++; |
1da177e4 LT |
628 | goto next_byte; |
629 | } | |
630 | ||
fa9cd547 LY |
631 | if (function == ACPI_READ) { |
632 | f_v |= temp << 8 * i; | |
1da177e4 LT |
633 | *value = f_v; |
634 | } | |
635 | ||
636 | ||
637 | out: | |
638 | switch (result) { | |
639 | case -EINVAL: | |
640 | return_VALUE(AE_BAD_PARAMETER); | |
641 | break; | |
642 | case -ENODEV: | |
643 | return_VALUE(AE_NOT_FOUND); | |
644 | break; | |
645 | case -ETIME: | |
646 | return_VALUE(AE_TIME); | |
647 | break; | |
648 | default: | |
649 | return_VALUE(AE_OK); | |
650 | } | |
1da177e4 LT |
651 | } |
652 | ||
653 | ||
654 | /* -------------------------------------------------------------------------- | |
655 | FS Interface (/proc) | |
656 | -------------------------------------------------------------------------- */ | |
657 | ||
658 | static struct proc_dir_entry *acpi_ec_dir; | |
659 | ||
660 | ||
661 | static int | |
662 | acpi_ec_read_info (struct seq_file *seq, void *offset) | |
663 | { | |
664 | struct acpi_ec *ec = (struct acpi_ec *) seq->private; | |
665 | ||
666 | ACPI_FUNCTION_TRACE("acpi_ec_read_info"); | |
667 | ||
668 | if (!ec) | |
669 | goto end; | |
670 | ||
671 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
672 | (u32) ec->gpe_bit); | |
673 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", | |
674 | (u32) ec->status_addr.address, (u32) ec->data_addr.address); | |
675 | seq_printf(seq, "use global lock: %s\n", | |
676 | ec->global_lock?"yes":"no"); | |
17e9c78a | 677 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 LT |
678 | |
679 | end: | |
680 | return_VALUE(0); | |
681 | } | |
682 | ||
683 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
684 | { | |
685 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
686 | } | |
687 | ||
688 | static struct file_operations acpi_ec_info_ops = { | |
689 | .open = acpi_ec_info_open_fs, | |
690 | .read = seq_read, | |
691 | .llseek = seq_lseek, | |
692 | .release = single_release, | |
693 | .owner = THIS_MODULE, | |
694 | }; | |
695 | ||
696 | static int | |
697 | acpi_ec_add_fs ( | |
698 | struct acpi_device *device) | |
699 | { | |
451566f4 | 700 | struct proc_dir_entry *entry; |
1da177e4 LT |
701 | |
702 | ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); | |
703 | ||
704 | if (!acpi_device_dir(device)) { | |
705 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
706 | acpi_ec_dir); | |
707 | if (!acpi_device_dir(device)) | |
708 | return_VALUE(-ENODEV); | |
709 | } | |
710 | ||
711 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
712 | acpi_device_dir(device)); | |
713 | if (!entry) | |
714 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
715 | "Unable to create '%s' fs entry\n", | |
716 | ACPI_EC_FILE_INFO)); | |
717 | else { | |
718 | entry->proc_fops = &acpi_ec_info_ops; | |
719 | entry->data = acpi_driver_data(device); | |
720 | entry->owner = THIS_MODULE; | |
721 | } | |
722 | ||
723 | return_VALUE(0); | |
724 | } | |
725 | ||
726 | ||
727 | static int | |
728 | acpi_ec_remove_fs ( | |
729 | struct acpi_device *device) | |
730 | { | |
731 | ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); | |
732 | ||
733 | if (acpi_device_dir(device)) { | |
734 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
735 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
736 | acpi_device_dir(device) = NULL; | |
737 | } | |
738 | ||
739 | return_VALUE(0); | |
740 | } | |
741 | ||
742 | ||
743 | /* -------------------------------------------------------------------------- | |
744 | Driver Interface | |
745 | -------------------------------------------------------------------------- */ | |
746 | ||
747 | static int | |
748 | acpi_ec_add ( | |
749 | struct acpi_device *device) | |
750 | { | |
451566f4 DT |
751 | int result; |
752 | acpi_status status; | |
753 | struct acpi_ec *ec; | |
1da177e4 LT |
754 | unsigned long uid; |
755 | ||
756 | ACPI_FUNCTION_TRACE("acpi_ec_add"); | |
757 | ||
758 | if (!device) | |
759 | return_VALUE(-EINVAL); | |
760 | ||
761 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
762 | if (!ec) | |
763 | return_VALUE(-ENOMEM); | |
764 | memset(ec, 0, sizeof(struct acpi_ec)); | |
765 | ||
766 | ec->handle = device->handle; | |
767 | ec->uid = -1; | |
451566f4 DT |
768 | atomic_set(&ec->pending_gpe, 0); |
769 | atomic_set(&ec->leaving_burst , 1); | |
770 | init_MUTEX(&ec->sem); | |
771 | init_waitqueue_head(&ec->wait); | |
1da177e4 LT |
772 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
773 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
774 | acpi_driver_data(device) = ec; | |
775 | ||
776 | /* Use the global lock for all EC transactions? */ | |
777 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); | |
778 | ||
779 | /* If our UID matches the UID for the ECDT-enumerated EC, | |
780 | we now have the *real* EC info, so kill the makeshift one.*/ | |
781 | acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid); | |
782 | if (ec_ecdt && ec_ecdt->uid == uid) { | |
783 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, | |
784 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
451566f4 | 785 | |
1da177e4 LT |
786 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); |
787 | ||
788 | kfree(ec_ecdt); | |
789 | } | |
790 | ||
791 | /* Get GPE bit assignment (EC events). */ | |
792 | /* TODO: Add support for _GPE returning a package */ | |
793 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); | |
794 | if (ACPI_FAILURE(status)) { | |
795 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
796 | "Error obtaining GPE bit assignment\n")); | |
797 | result = -ENODEV; | |
798 | goto end; | |
799 | } | |
800 | ||
801 | result = acpi_ec_add_fs(device); | |
802 | if (result) | |
803 | goto end; | |
804 | ||
805 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", | |
806 | acpi_device_name(device), acpi_device_bid(device), | |
807 | (u32) ec->gpe_bit); | |
808 | ||
809 | if (!first_ec) | |
810 | first_ec = device; | |
811 | ||
812 | end: | |
813 | if (result) | |
814 | kfree(ec); | |
815 | ||
816 | return_VALUE(result); | |
817 | } | |
818 | ||
819 | ||
820 | static int | |
821 | acpi_ec_remove ( | |
822 | struct acpi_device *device, | |
823 | int type) | |
824 | { | |
451566f4 | 825 | struct acpi_ec *ec; |
1da177e4 LT |
826 | |
827 | ACPI_FUNCTION_TRACE("acpi_ec_remove"); | |
828 | ||
829 | if (!device) | |
830 | return_VALUE(-EINVAL); | |
831 | ||
832 | ec = acpi_driver_data(device); | |
833 | ||
834 | acpi_ec_remove_fs(device); | |
835 | ||
836 | kfree(ec); | |
837 | ||
838 | return_VALUE(0); | |
839 | } | |
840 | ||
841 | ||
842 | static acpi_status | |
843 | acpi_ec_io_ports ( | |
844 | struct acpi_resource *resource, | |
845 | void *context) | |
846 | { | |
847 | struct acpi_ec *ec = (struct acpi_ec *) context; | |
848 | struct acpi_generic_address *addr; | |
849 | ||
850 | if (resource->id != ACPI_RSTYPE_IO) { | |
851 | return AE_OK; | |
852 | } | |
853 | ||
854 | /* | |
855 | * The first address region returned is the data port, and | |
856 | * the second address region returned is the status/command | |
857 | * port. | |
858 | */ | |
859 | if (ec->data_addr.register_bit_width == 0) { | |
860 | addr = &ec->data_addr; | |
861 | } else if (ec->command_addr.register_bit_width == 0) { | |
862 | addr = &ec->command_addr; | |
863 | } else { | |
864 | return AE_CTRL_TERMINATE; | |
865 | } | |
866 | ||
867 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
868 | addr->register_bit_width = 8; | |
869 | addr->register_bit_offset = 0; | |
870 | addr->address = resource->data.io.min_base_address; | |
871 | ||
872 | return AE_OK; | |
873 | } | |
874 | ||
875 | ||
876 | static int | |
877 | acpi_ec_start ( | |
878 | struct acpi_device *device) | |
879 | { | |
451566f4 DT |
880 | acpi_status status; |
881 | struct acpi_ec *ec; | |
1da177e4 LT |
882 | |
883 | ACPI_FUNCTION_TRACE("acpi_ec_start"); | |
884 | ||
885 | if (!device) | |
886 | return_VALUE(-EINVAL); | |
887 | ||
888 | ec = acpi_driver_data(device); | |
889 | ||
890 | if (!ec) | |
891 | return_VALUE(-EINVAL); | |
892 | ||
893 | /* | |
894 | * Get I/O port addresses. Convert to GAS format. | |
895 | */ | |
896 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, | |
897 | acpi_ec_io_ports, ec); | |
898 | if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { | |
899 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses")); | |
900 | return_VALUE(-ENODEV); | |
901 | } | |
902 | ||
903 | ec->status_addr = ec->command_addr; | |
904 | ||
905 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
906 | (u32) ec->gpe_bit, (u32) ec->command_addr.address, | |
907 | (u32) ec->data_addr.address)); | |
908 | ||
909 | /* | |
910 | * Install GPE handler | |
911 | */ | |
912 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, | |
913 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); | |
914 | if (ACPI_FAILURE(status)) { | |
915 | return_VALUE(-ENODEV); | |
916 | } | |
917 | acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
918 | acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
919 | ||
920 | status = acpi_install_address_space_handler (ec->handle, | |
921 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
922 | &acpi_ec_space_setup, ec); | |
923 | if (ACPI_FAILURE(status)) { | |
924 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
925 | return_VALUE(-ENODEV); | |
926 | } | |
927 | ||
928 | return_VALUE(AE_OK); | |
929 | } | |
930 | ||
931 | ||
932 | static int | |
933 | acpi_ec_stop ( | |
934 | struct acpi_device *device, | |
935 | int type) | |
936 | { | |
451566f4 DT |
937 | acpi_status status; |
938 | struct acpi_ec *ec; | |
1da177e4 LT |
939 | |
940 | ACPI_FUNCTION_TRACE("acpi_ec_stop"); | |
941 | ||
942 | if (!device) | |
943 | return_VALUE(-EINVAL); | |
944 | ||
945 | ec = acpi_driver_data(device); | |
946 | ||
947 | status = acpi_remove_address_space_handler(ec->handle, | |
948 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
949 | if (ACPI_FAILURE(status)) | |
950 | return_VALUE(-ENODEV); | |
951 | ||
952 | status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
953 | if (ACPI_FAILURE(status)) | |
954 | return_VALUE(-ENODEV); | |
955 | ||
956 | return_VALUE(0); | |
957 | } | |
958 | ||
959 | static acpi_status __init | |
960 | acpi_fake_ecdt_callback ( | |
961 | acpi_handle handle, | |
962 | u32 Level, | |
963 | void *context, | |
964 | void **retval) | |
965 | { | |
966 | acpi_status status; | |
967 | ||
968 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
969 | acpi_ec_io_ports, ec_ecdt); | |
970 | if (ACPI_FAILURE(status)) | |
971 | return status; | |
972 | ec_ecdt->status_addr = ec_ecdt->command_addr; | |
973 | ||
974 | ec_ecdt->uid = -1; | |
975 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
976 | ||
977 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); | |
978 | if (ACPI_FAILURE(status)) | |
979 | return status; | |
1da177e4 LT |
980 | ec_ecdt->global_lock = TRUE; |
981 | ec_ecdt->handle = handle; | |
982 | ||
983 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", | |
984 | (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, | |
985 | (u32) ec_ecdt->data_addr.address); | |
986 | ||
987 | return AE_CTRL_TERMINATE; | |
988 | } | |
989 | ||
990 | /* | |
991 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
992 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
993 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
994 | * required, but if EC regison is accessed early, it is required. | |
995 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
996 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
997 | * op region (since _REG isn't invoked yet). The assumption is true for | |
998 | * all systems found. | |
999 | */ | |
1000 | static int __init | |
1001 | acpi_ec_fake_ecdt(void) | |
1002 | { | |
1003 | acpi_status status; | |
1004 | int ret = 0; | |
1005 | ||
1006 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1007 | ||
1008 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1009 | if (!ec_ecdt) { | |
1010 | ret = -ENOMEM; | |
1011 | goto error; | |
1012 | } | |
1013 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1014 | ||
1015 | status = acpi_get_devices (ACPI_EC_HID, | |
1016 | acpi_fake_ecdt_callback, | |
1017 | NULL, | |
1018 | NULL); | |
1019 | if (ACPI_FAILURE(status)) { | |
1020 | kfree(ec_ecdt); | |
1021 | ec_ecdt = NULL; | |
1022 | ret = -ENODEV; | |
1023 | goto error; | |
1024 | } | |
1025 | return 0; | |
1026 | error: | |
1027 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | static int __init | |
1032 | acpi_ec_get_real_ecdt(void) | |
1033 | { | |
1034 | acpi_status status; | |
1035 | struct acpi_table_ecdt *ecdt_ptr; | |
1036 | ||
451566f4 | 1037 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1da177e4 LT |
1038 | (struct acpi_table_header **) &ecdt_ptr); |
1039 | if (ACPI_FAILURE(status)) | |
1040 | return -ENODEV; | |
1041 | ||
1042 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1043 | ||
1044 | /* | |
1045 | * Generate a temporary ec context to use until the namespace is scanned | |
1046 | */ | |
1047 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1048 | if (!ec_ecdt) | |
1049 | return -ENOMEM; | |
1050 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1051 | ||
451566f4 DT |
1052 | init_MUTEX(&ec_ecdt->sem); |
1053 | init_waitqueue_head(&ec_ecdt->wait); | |
1da177e4 LT |
1054 | ec_ecdt->command_addr = ecdt_ptr->ec_control; |
1055 | ec_ecdt->status_addr = ecdt_ptr->ec_control; | |
1056 | ec_ecdt->data_addr = ecdt_ptr->ec_data; | |
1057 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 LT |
1058 | /* use the GL just to be safe */ |
1059 | ec_ecdt->global_lock = TRUE; | |
1060 | ec_ecdt->uid = ecdt_ptr->uid; | |
1061 | ||
1062 | status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); | |
1063 | if (ACPI_FAILURE(status)) { | |
1064 | goto error; | |
1065 | } | |
1066 | ||
1067 | return 0; | |
1068 | error: | |
1069 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1070 | kfree(ec_ecdt); | |
1071 | ec_ecdt = NULL; | |
1072 | ||
1073 | return -ENODEV; | |
1074 | } | |
1075 | ||
1076 | static int __initdata acpi_fake_ecdt_enabled; | |
1077 | int __init | |
1078 | acpi_ec_ecdt_probe (void) | |
1079 | { | |
1080 | acpi_status status; | |
1081 | int ret; | |
1082 | ||
1083 | ret = acpi_ec_get_real_ecdt(); | |
1084 | /* Try to make a fake ECDT */ | |
1085 | if (ret && acpi_fake_ecdt_enabled) { | |
1086 | ret = acpi_ec_fake_ecdt(); | |
1087 | } | |
1088 | ||
1089 | if (ret) | |
1090 | return 0; | |
1091 | ||
1092 | /* | |
1093 | * Install GPE handler | |
1094 | */ | |
1095 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1096 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, | |
1097 | ec_ecdt); | |
1098 | if (ACPI_FAILURE(status)) { | |
1099 | goto error; | |
1100 | } | |
1101 | acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
1102 | acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
1103 | ||
1104 | status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT, | |
1105 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
1106 | &acpi_ec_space_setup, ec_ecdt); | |
1107 | if (ACPI_FAILURE(status)) { | |
1108 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1109 | &acpi_ec_gpe_handler); | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | return 0; | |
1114 | ||
1115 | error: | |
1116 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1117 | kfree(ec_ecdt); | |
1118 | ec_ecdt = NULL; | |
1119 | ||
1120 | return -ENODEV; | |
1121 | } | |
1122 | ||
1123 | ||
1124 | static int __init acpi_ec_init (void) | |
1125 | { | |
451566f4 | 1126 | int result; |
1da177e4 LT |
1127 | |
1128 | ACPI_FUNCTION_TRACE("acpi_ec_init"); | |
1129 | ||
1130 | if (acpi_disabled) | |
1131 | return_VALUE(0); | |
1132 | ||
1133 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1134 | if (!acpi_ec_dir) | |
1135 | return_VALUE(-ENODEV); | |
1136 | ||
1137 | /* Now register the driver for the EC */ | |
1138 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1139 | if (result < 0) { | |
1140 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1141 | return_VALUE(-ENODEV); | |
1142 | } | |
1143 | ||
1144 | return_VALUE(result); | |
1145 | } | |
1146 | ||
1147 | subsys_initcall(acpi_ec_init); | |
1148 | ||
1149 | /* EC driver currently not unloadable */ | |
1150 | #if 0 | |
1151 | static void __exit | |
1152 | acpi_ec_exit (void) | |
1153 | { | |
1154 | ACPI_FUNCTION_TRACE("acpi_ec_exit"); | |
1155 | ||
1156 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1157 | ||
1158 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1159 | ||
1160 | return_VOID; | |
1161 | } | |
1162 | #endif /* 0 */ | |
1163 | ||
1164 | static int __init acpi_fake_ecdt_setup(char *str) | |
1165 | { | |
1166 | acpi_fake_ecdt_enabled = 1; | |
1167 | return 0; | |
1168 | } | |
1169 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |