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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)){ | |
173 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n")); | |
174 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); | |
175 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
176 | if (status){ | |
177 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
178 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status)); | |
179 | return_VALUE(-EINVAL); | |
180 | } | |
181 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
182 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
183 | if(tmp != 0x90 ) {/* Burst ACK byte*/ | |
184 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n")); | |
185 | return_VALUE(-EINVAL); | |
186 | } | |
187 | } else | |
188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n")); | |
189 | atomic_set(&ec->leaving_burst , 0); | |
190 | return_VALUE(0); | |
191 | } | |
192 | ||
193 | static int | |
194 | acpi_ec_leave_burst_mode ( | |
195 | struct acpi_ec *ec) | |
196 | { | |
197 | int status =0; | |
198 | ||
199 | ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); | |
200 | ||
201 | atomic_set(&ec->leaving_burst , 1); | |
202 | status = acpi_ec_read_status(ec); | |
203 | if (status != -EINVAL && | |
204 | (status & ACPI_EC_FLAG_BURST)){ | |
205 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); | |
206 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr); | |
207 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
208 | if (status){ | |
209 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n")); | |
211 | return_VALUE(-EINVAL); | |
212 | } | |
213 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
214 | status = acpi_ec_read_status(ec); | |
215 | if (status != -EINVAL && | |
216 | (status & ACPI_EC_FLAG_BURST)) { | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n")); | |
218 | return_VALUE(-EINVAL); | |
219 | } | |
220 | }else | |
221 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n")); | |
222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); | |
223 | ||
224 | return_VALUE(0); | |
225 | } | |
226 | ||
1da177e4 LT |
227 | static int |
228 | acpi_ec_read ( | |
229 | struct acpi_ec *ec, | |
230 | u8 address, | |
231 | u32 *data) | |
232 | { | |
451566f4 DT |
233 | int status = 0; |
234 | u32 glk; | |
1da177e4 LT |
235 | |
236 | ACPI_FUNCTION_TRACE("acpi_ec_read"); | |
237 | ||
238 | if (!ec || !data) | |
239 | return_VALUE(-EINVAL); | |
240 | ||
451566f4 | 241 | retry: |
1da177e4 LT |
242 | *data = 0; |
243 | ||
244 | if (ec->global_lock) { | |
245 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
246 | if (ACPI_FAILURE(status)) | |
247 | return_VALUE(-ENODEV); | |
248 | } | |
451566f4 DT |
249 | |
250 | WARN_ON(in_interrupt()); | |
251 | down(&ec->sem); | |
252 | ||
253 | if(acpi_ec_enter_burst_mode(ec)) | |
254 | goto end; | |
1da177e4 LT |
255 | |
256 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr); | |
451566f4 DT |
257 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
258 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
259 | if (status) { | |
1da177e4 | 260 | goto end; |
451566f4 | 261 | } |
1da177e4 LT |
262 | |
263 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
264 | status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
265 | if (status){ | |
266 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 267 | goto end; |
451566f4 | 268 | } |
1da177e4 LT |
269 | |
270 | acpi_hw_low_level_read(8, data, &ec->data_addr); | |
451566f4 | 271 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 LT |
272 | |
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", | |
274 | *data, address)); | |
451566f4 | 275 | |
1da177e4 | 276 | end: |
451566f4 DT |
277 | acpi_ec_leave_burst_mode(ec); |
278 | up(&ec->sem); | |
1da177e4 LT |
279 | |
280 | if (ec->global_lock) | |
281 | acpi_release_global_lock(glk); | |
282 | ||
451566f4 DT |
283 | if(atomic_read(&ec->leaving_burst) == 2){ |
284 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
285 | while(!atomic_read(&ec->pending_gpe)){ | |
286 | msleep(1); | |
287 | } | |
288 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
289 | goto retry; | |
290 | } | |
291 | ||
292 | return_VALUE(status); | |
1da177e4 LT |
293 | } |
294 | ||
295 | ||
296 | static int | |
297 | acpi_ec_write ( | |
298 | struct acpi_ec *ec, | |
299 | u8 address, | |
300 | u8 data) | |
301 | { | |
451566f4 DT |
302 | int status = 0; |
303 | u32 glk; | |
304 | u32 tmp; | |
1da177e4 LT |
305 | |
306 | ACPI_FUNCTION_TRACE("acpi_ec_write"); | |
307 | ||
308 | if (!ec) | |
309 | return_VALUE(-EINVAL); | |
451566f4 | 310 | retry: |
1da177e4 LT |
311 | if (ec->global_lock) { |
312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
313 | if (ACPI_FAILURE(status)) | |
314 | return_VALUE(-ENODEV); | |
315 | } | |
316 | ||
451566f4 DT |
317 | WARN_ON(in_interrupt()); |
318 | down(&ec->sem); | |
319 | ||
320 | if(acpi_ec_enter_burst_mode(ec)) | |
321 | goto end; | |
322 | ||
323 | status = acpi_ec_read_status(ec); | |
324 | if (status != -EINVAL && | |
325 | !(status & ACPI_EC_FLAG_BURST)){ | |
326 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); | |
327 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
328 | if (status) | |
329 | goto end; | |
330 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
331 | if(tmp != 0x90 ) /* Burst ACK byte*/ | |
332 | goto end; | |
333 | } | |
334 | /*Now we are in burst mode*/ | |
1da177e4 LT |
335 | |
336 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr); | |
451566f4 DT |
337 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
338 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
339 | if (status){ | |
1da177e4 | 340 | goto end; |
451566f4 | 341 | } |
1da177e4 LT |
342 | |
343 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
344 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
345 | if (status){ | |
346 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 347 | goto end; |
451566f4 | 348 | } |
1da177e4 LT |
349 | |
350 | acpi_hw_low_level_write(8, data, &ec->data_addr); | |
451566f4 DT |
351 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
352 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
353 | if (status) | |
1da177e4 LT |
354 | goto end; |
355 | ||
356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
357 | data, address)); | |
358 | ||
359 | end: | |
451566f4 DT |
360 | acpi_ec_leave_burst_mode(ec); |
361 | up(&ec->sem); | |
1da177e4 LT |
362 | |
363 | if (ec->global_lock) | |
364 | acpi_release_global_lock(glk); | |
365 | ||
451566f4 DT |
366 | if(atomic_read(&ec->leaving_burst) == 2){ |
367 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
368 | while(!atomic_read(&ec->pending_gpe)){ | |
369 | msleep(1); | |
370 | } | |
371 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
372 | goto retry; | |
373 | } | |
374 | ||
375 | return_VALUE(status); | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* | |
379 | * Externally callable EC access functions. For now, assume 1 EC only | |
380 | */ | |
381 | int | |
382 | ec_read(u8 addr, u8 *val) | |
383 | { | |
384 | struct acpi_ec *ec; | |
385 | int err; | |
386 | u32 temp_data; | |
387 | ||
388 | if (!first_ec) | |
389 | return -ENODEV; | |
390 | ||
391 | ec = acpi_driver_data(first_ec); | |
392 | ||
393 | err = acpi_ec_read(ec, addr, &temp_data); | |
394 | ||
395 | if (!err) { | |
396 | *val = temp_data; | |
397 | return 0; | |
398 | } | |
399 | else | |
400 | return err; | |
401 | } | |
402 | EXPORT_SYMBOL(ec_read); | |
403 | ||
404 | int | |
405 | ec_write(u8 addr, u8 val) | |
406 | { | |
407 | struct acpi_ec *ec; | |
408 | int err; | |
409 | ||
410 | if (!first_ec) | |
411 | return -ENODEV; | |
412 | ||
413 | ec = acpi_driver_data(first_ec); | |
414 | ||
415 | err = acpi_ec_write(ec, addr, val); | |
416 | ||
417 | return err; | |
418 | } | |
419 | EXPORT_SYMBOL(ec_write); | |
420 | ||
421 | ||
422 | static int | |
423 | acpi_ec_query ( | |
424 | struct acpi_ec *ec, | |
425 | u32 *data) | |
426 | { | |
451566f4 DT |
427 | int status = 0; |
428 | u32 glk; | |
1da177e4 LT |
429 | |
430 | ACPI_FUNCTION_TRACE("acpi_ec_query"); | |
431 | ||
432 | if (!ec || !data) | |
433 | return_VALUE(-EINVAL); | |
451566f4 | 434 | retry: |
1da177e4 LT |
435 | *data = 0; |
436 | ||
437 | if (ec->global_lock) { | |
438 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
439 | if (ACPI_FAILURE(status)) | |
440 | return_VALUE(-ENODEV); | |
441 | } | |
442 | ||
451566f4 DT |
443 | down(&ec->sem); |
444 | if(acpi_ec_enter_burst_mode(ec)) | |
445 | goto end; | |
1da177e4 LT |
446 | /* |
447 | * Query the EC to find out which _Qxx method we need to evaluate. | |
448 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
449 | * bit to be cleared (and thus clearing the interrupt source). | |
450 | */ | |
1da177e4 | 451 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr); |
451566f4 DT |
452 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
453 | if (status){ | |
454 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 455 | goto end; |
451566f4 DT |
456 | } |
457 | ||
1da177e4 | 458 | acpi_hw_low_level_read(8, data, &ec->data_addr); |
451566f4 | 459 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 460 | if (!*data) |
451566f4 | 461 | status = -ENODATA; |
1da177e4 LT |
462 | |
463 | end: | |
451566f4 DT |
464 | acpi_ec_leave_burst_mode(ec); |
465 | up(&ec->sem); | |
1da177e4 LT |
466 | |
467 | if (ec->global_lock) | |
468 | acpi_release_global_lock(glk); | |
469 | ||
451566f4 DT |
470 | if(atomic_read(&ec->leaving_burst) == 2){ |
471 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
472 | while(!atomic_read(&ec->pending_gpe)){ | |
473 | msleep(1); | |
474 | } | |
475 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
476 | goto retry; | |
477 | } | |
478 | ||
479 | return_VALUE(status); | |
1da177e4 LT |
480 | } |
481 | ||
482 | ||
483 | /* -------------------------------------------------------------------------- | |
484 | Event Management | |
485 | -------------------------------------------------------------------------- */ | |
486 | ||
487 | struct acpi_ec_query_data { | |
488 | acpi_handle handle; | |
489 | u8 data; | |
490 | }; | |
491 | ||
492 | static void | |
493 | acpi_ec_gpe_query ( | |
494 | void *ec_cxt) | |
495 | { | |
496 | struct acpi_ec *ec = (struct acpi_ec *) ec_cxt; | |
451566f4 DT |
497 | u32 value; |
498 | int result = -ENODATA; | |
1da177e4 LT |
499 | static char object_name[5] = {'_','Q','0','0','\0'}; |
500 | const char hex[] = {'0','1','2','3','4','5','6','7', | |
501 | '8','9','A','B','C','D','E','F'}; | |
502 | ||
503 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); | |
504 | ||
451566f4 DT |
505 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
506 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 507 | |
451566f4 | 508 | if (result) |
1da177e4 LT |
509 | goto end; |
510 | ||
1da177e4 LT |
511 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
512 | object_name[3] = hex[(value & 0x0F)]; | |
513 | ||
514 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
515 | ||
516 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); | |
451566f4 DT |
517 | atomic_dec(&ec->pending_gpe); |
518 | end: | |
519 | return; | |
1da177e4 LT |
520 | } |
521 | ||
522 | static u32 | |
523 | acpi_ec_gpe_handler ( | |
524 | void *data) | |
525 | { | |
526 | acpi_status status = AE_OK; | |
451566f4 | 527 | u32 value; |
1da177e4 LT |
528 | struct acpi_ec *ec = (struct acpi_ec *) data; |
529 | ||
530 | if (!ec) | |
531 | return ACPI_INTERRUPT_NOT_HANDLED; | |
532 | ||
533 | acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); | |
534 | ||
451566f4 | 535 | value = acpi_ec_read_status(ec); |
1da177e4 | 536 | |
451566f4 DT |
537 | if((value & ACPI_EC_FLAG_IBF) && |
538 | !(value & ACPI_EC_FLAG_BURST) && | |
539 | (atomic_read(&ec->leaving_burst) == 0)) { | |
540 | /* | |
541 | * the embedded controller disables | |
542 | * burst mode for any reason other | |
543 | * than the burst disable command | |
544 | * to process critical event. | |
545 | */ | |
546 | atomic_set(&ec->leaving_burst , 2); /* block current pending transaction | |
547 | and retry */ | |
548 | wake_up(&ec->wait); | |
549 | }else { | |
550 | if ((ec->expect_event == ACPI_EC_EVENT_OBF && | |
551 | (value & ACPI_EC_FLAG_OBF)) || | |
552 | (ec->expect_event == ACPI_EC_EVENT_IBE && | |
553 | !(value & ACPI_EC_FLAG_IBF))) { | |
554 | ec->expect_event = 0; | |
555 | wake_up(&ec->wait); | |
556 | ||
557 | } | |
558 | } | |
559 | ||
560 | if (value & ACPI_EC_FLAG_SCI){ | |
561 | atomic_add(1, &ec->pending_gpe) ; | |
562 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, | |
563 | acpi_ec_gpe_query, ec); | |
564 | } | |
565 | ||
566 | return status == AE_OK ? | |
567 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; | |
1da177e4 LT |
568 | } |
569 | ||
570 | /* -------------------------------------------------------------------------- | |
571 | Address Space Management | |
572 | -------------------------------------------------------------------------- */ | |
573 | ||
574 | static acpi_status | |
575 | acpi_ec_space_setup ( | |
576 | acpi_handle region_handle, | |
577 | u32 function, | |
578 | void *handler_context, | |
579 | void **return_context) | |
580 | { | |
581 | /* | |
582 | * The EC object is in the handler context and is needed | |
583 | * when calling the acpi_ec_space_handler. | |
584 | */ | |
451566f4 DT |
585 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
586 | handler_context : NULL; | |
1da177e4 LT |
587 | |
588 | return AE_OK; | |
589 | } | |
590 | ||
591 | ||
592 | static acpi_status | |
593 | acpi_ec_space_handler ( | |
594 | u32 function, | |
595 | acpi_physical_address address, | |
596 | u32 bit_width, | |
597 | acpi_integer *value, | |
598 | void *handler_context, | |
599 | void *region_context) | |
600 | { | |
601 | int result = 0; | |
602 | struct acpi_ec *ec = NULL; | |
fa9cd547 | 603 | u64 temp = *value; |
1da177e4 LT |
604 | acpi_integer f_v = 0; |
605 | int i = 0; | |
606 | ||
607 | ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); | |
608 | ||
609 | if ((address > 0xFF) || !value || !handler_context) | |
610 | return_VALUE(AE_BAD_PARAMETER); | |
611 | ||
fa9cd547 | 612 | if (bit_width != 8 && acpi_strict) { |
1da177e4 | 613 | printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n"); |
fa9cd547 | 614 | return_VALUE(AE_BAD_PARAMETER); |
1da177e4 LT |
615 | } |
616 | ||
617 | ec = (struct acpi_ec *) handler_context; | |
618 | ||
619 | next_byte: | |
620 | switch (function) { | |
621 | case ACPI_READ: | |
fa9cd547 LY |
622 | temp = 0; |
623 | result = acpi_ec_read(ec, (u8) address, (u32 *)&temp); | |
1da177e4 LT |
624 | break; |
625 | case ACPI_WRITE: | |
fa9cd547 | 626 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
627 | break; |
628 | default: | |
629 | result = -EINVAL; | |
630 | goto out; | |
631 | break; | |
632 | } | |
633 | ||
634 | bit_width -= 8; | |
fa9cd547 LY |
635 | if (bit_width) { |
636 | if (function == ACPI_READ) | |
637 | f_v |= temp << 8 * i; | |
638 | if (function == ACPI_WRITE) | |
639 | temp >>= 8; | |
1da177e4 | 640 | i++; |
83ea7445 | 641 | address++; |
1da177e4 LT |
642 | goto next_byte; |
643 | } | |
644 | ||
fa9cd547 LY |
645 | if (function == ACPI_READ) { |
646 | f_v |= temp << 8 * i; | |
1da177e4 LT |
647 | *value = f_v; |
648 | } | |
649 | ||
650 | ||
651 | out: | |
652 | switch (result) { | |
653 | case -EINVAL: | |
654 | return_VALUE(AE_BAD_PARAMETER); | |
655 | break; | |
656 | case -ENODEV: | |
657 | return_VALUE(AE_NOT_FOUND); | |
658 | break; | |
659 | case -ETIME: | |
660 | return_VALUE(AE_TIME); | |
661 | break; | |
662 | default: | |
663 | return_VALUE(AE_OK); | |
664 | } | |
1da177e4 LT |
665 | } |
666 | ||
667 | ||
668 | /* -------------------------------------------------------------------------- | |
669 | FS Interface (/proc) | |
670 | -------------------------------------------------------------------------- */ | |
671 | ||
672 | static struct proc_dir_entry *acpi_ec_dir; | |
673 | ||
674 | ||
675 | static int | |
676 | acpi_ec_read_info (struct seq_file *seq, void *offset) | |
677 | { | |
678 | struct acpi_ec *ec = (struct acpi_ec *) seq->private; | |
679 | ||
680 | ACPI_FUNCTION_TRACE("acpi_ec_read_info"); | |
681 | ||
682 | if (!ec) | |
683 | goto end; | |
684 | ||
685 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
686 | (u32) ec->gpe_bit); | |
687 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", | |
688 | (u32) ec->status_addr.address, (u32) ec->data_addr.address); | |
689 | seq_printf(seq, "use global lock: %s\n", | |
690 | ec->global_lock?"yes":"no"); | |
691 | ||
692 | end: | |
693 | return_VALUE(0); | |
694 | } | |
695 | ||
696 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
697 | { | |
698 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
699 | } | |
700 | ||
701 | static struct file_operations acpi_ec_info_ops = { | |
702 | .open = acpi_ec_info_open_fs, | |
703 | .read = seq_read, | |
704 | .llseek = seq_lseek, | |
705 | .release = single_release, | |
706 | .owner = THIS_MODULE, | |
707 | }; | |
708 | ||
709 | static int | |
710 | acpi_ec_add_fs ( | |
711 | struct acpi_device *device) | |
712 | { | |
451566f4 | 713 | struct proc_dir_entry *entry; |
1da177e4 LT |
714 | |
715 | ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); | |
716 | ||
717 | if (!acpi_device_dir(device)) { | |
718 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
719 | acpi_ec_dir); | |
720 | if (!acpi_device_dir(device)) | |
721 | return_VALUE(-ENODEV); | |
722 | } | |
723 | ||
724 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
725 | acpi_device_dir(device)); | |
726 | if (!entry) | |
727 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
728 | "Unable to create '%s' fs entry\n", | |
729 | ACPI_EC_FILE_INFO)); | |
730 | else { | |
731 | entry->proc_fops = &acpi_ec_info_ops; | |
732 | entry->data = acpi_driver_data(device); | |
733 | entry->owner = THIS_MODULE; | |
734 | } | |
735 | ||
736 | return_VALUE(0); | |
737 | } | |
738 | ||
739 | ||
740 | static int | |
741 | acpi_ec_remove_fs ( | |
742 | struct acpi_device *device) | |
743 | { | |
744 | ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); | |
745 | ||
746 | if (acpi_device_dir(device)) { | |
747 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
748 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
749 | acpi_device_dir(device) = NULL; | |
750 | } | |
751 | ||
752 | return_VALUE(0); | |
753 | } | |
754 | ||
755 | ||
756 | /* -------------------------------------------------------------------------- | |
757 | Driver Interface | |
758 | -------------------------------------------------------------------------- */ | |
759 | ||
760 | static int | |
761 | acpi_ec_add ( | |
762 | struct acpi_device *device) | |
763 | { | |
451566f4 DT |
764 | int result; |
765 | acpi_status status; | |
766 | struct acpi_ec *ec; | |
1da177e4 LT |
767 | unsigned long uid; |
768 | ||
769 | ACPI_FUNCTION_TRACE("acpi_ec_add"); | |
770 | ||
771 | if (!device) | |
772 | return_VALUE(-EINVAL); | |
773 | ||
774 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
775 | if (!ec) | |
776 | return_VALUE(-ENOMEM); | |
777 | memset(ec, 0, sizeof(struct acpi_ec)); | |
778 | ||
779 | ec->handle = device->handle; | |
780 | ec->uid = -1; | |
451566f4 DT |
781 | atomic_set(&ec->pending_gpe, 0); |
782 | atomic_set(&ec->leaving_burst , 1); | |
783 | init_MUTEX(&ec->sem); | |
784 | init_waitqueue_head(&ec->wait); | |
1da177e4 LT |
785 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
786 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
787 | acpi_driver_data(device) = ec; | |
788 | ||
789 | /* Use the global lock for all EC transactions? */ | |
790 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); | |
791 | ||
792 | /* If our UID matches the UID for the ECDT-enumerated EC, | |
793 | we now have the *real* EC info, so kill the makeshift one.*/ | |
794 | acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid); | |
795 | if (ec_ecdt && ec_ecdt->uid == uid) { | |
796 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, | |
797 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
451566f4 | 798 | |
1da177e4 LT |
799 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); |
800 | ||
801 | kfree(ec_ecdt); | |
802 | } | |
803 | ||
804 | /* Get GPE bit assignment (EC events). */ | |
805 | /* TODO: Add support for _GPE returning a package */ | |
806 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); | |
807 | if (ACPI_FAILURE(status)) { | |
808 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
809 | "Error obtaining GPE bit assignment\n")); | |
810 | result = -ENODEV; | |
811 | goto end; | |
812 | } | |
813 | ||
814 | result = acpi_ec_add_fs(device); | |
815 | if (result) | |
816 | goto end; | |
817 | ||
818 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", | |
819 | acpi_device_name(device), acpi_device_bid(device), | |
820 | (u32) ec->gpe_bit); | |
821 | ||
822 | if (!first_ec) | |
823 | first_ec = device; | |
824 | ||
825 | end: | |
826 | if (result) | |
827 | kfree(ec); | |
828 | ||
829 | return_VALUE(result); | |
830 | } | |
831 | ||
832 | ||
833 | static int | |
834 | acpi_ec_remove ( | |
835 | struct acpi_device *device, | |
836 | int type) | |
837 | { | |
451566f4 | 838 | struct acpi_ec *ec; |
1da177e4 LT |
839 | |
840 | ACPI_FUNCTION_TRACE("acpi_ec_remove"); | |
841 | ||
842 | if (!device) | |
843 | return_VALUE(-EINVAL); | |
844 | ||
845 | ec = acpi_driver_data(device); | |
846 | ||
847 | acpi_ec_remove_fs(device); | |
848 | ||
849 | kfree(ec); | |
850 | ||
851 | return_VALUE(0); | |
852 | } | |
853 | ||
854 | ||
855 | static acpi_status | |
856 | acpi_ec_io_ports ( | |
857 | struct acpi_resource *resource, | |
858 | void *context) | |
859 | { | |
860 | struct acpi_ec *ec = (struct acpi_ec *) context; | |
861 | struct acpi_generic_address *addr; | |
862 | ||
863 | if (resource->id != ACPI_RSTYPE_IO) { | |
864 | return AE_OK; | |
865 | } | |
866 | ||
867 | /* | |
868 | * The first address region returned is the data port, and | |
869 | * the second address region returned is the status/command | |
870 | * port. | |
871 | */ | |
872 | if (ec->data_addr.register_bit_width == 0) { | |
873 | addr = &ec->data_addr; | |
874 | } else if (ec->command_addr.register_bit_width == 0) { | |
875 | addr = &ec->command_addr; | |
876 | } else { | |
877 | return AE_CTRL_TERMINATE; | |
878 | } | |
879 | ||
880 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
881 | addr->register_bit_width = 8; | |
882 | addr->register_bit_offset = 0; | |
883 | addr->address = resource->data.io.min_base_address; | |
884 | ||
885 | return AE_OK; | |
886 | } | |
887 | ||
888 | ||
889 | static int | |
890 | acpi_ec_start ( | |
891 | struct acpi_device *device) | |
892 | { | |
451566f4 DT |
893 | acpi_status status; |
894 | struct acpi_ec *ec; | |
1da177e4 LT |
895 | |
896 | ACPI_FUNCTION_TRACE("acpi_ec_start"); | |
897 | ||
898 | if (!device) | |
899 | return_VALUE(-EINVAL); | |
900 | ||
901 | ec = acpi_driver_data(device); | |
902 | ||
903 | if (!ec) | |
904 | return_VALUE(-EINVAL); | |
905 | ||
906 | /* | |
907 | * Get I/O port addresses. Convert to GAS format. | |
908 | */ | |
909 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, | |
910 | acpi_ec_io_ports, ec); | |
911 | if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { | |
912 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses")); | |
913 | return_VALUE(-ENODEV); | |
914 | } | |
915 | ||
916 | ec->status_addr = ec->command_addr; | |
917 | ||
918 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
919 | (u32) ec->gpe_bit, (u32) ec->command_addr.address, | |
920 | (u32) ec->data_addr.address)); | |
921 | ||
922 | /* | |
923 | * Install GPE handler | |
924 | */ | |
925 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, | |
926 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); | |
927 | if (ACPI_FAILURE(status)) { | |
928 | return_VALUE(-ENODEV); | |
929 | } | |
930 | acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
931 | acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
932 | ||
933 | status = acpi_install_address_space_handler (ec->handle, | |
934 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
935 | &acpi_ec_space_setup, ec); | |
936 | if (ACPI_FAILURE(status)) { | |
937 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
938 | return_VALUE(-ENODEV); | |
939 | } | |
940 | ||
941 | return_VALUE(AE_OK); | |
942 | } | |
943 | ||
944 | ||
945 | static int | |
946 | acpi_ec_stop ( | |
947 | struct acpi_device *device, | |
948 | int type) | |
949 | { | |
451566f4 DT |
950 | acpi_status status; |
951 | struct acpi_ec *ec; | |
1da177e4 LT |
952 | |
953 | ACPI_FUNCTION_TRACE("acpi_ec_stop"); | |
954 | ||
955 | if (!device) | |
956 | return_VALUE(-EINVAL); | |
957 | ||
958 | ec = acpi_driver_data(device); | |
959 | ||
960 | status = acpi_remove_address_space_handler(ec->handle, | |
961 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
962 | if (ACPI_FAILURE(status)) | |
963 | return_VALUE(-ENODEV); | |
964 | ||
965 | status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
966 | if (ACPI_FAILURE(status)) | |
967 | return_VALUE(-ENODEV); | |
968 | ||
969 | return_VALUE(0); | |
970 | } | |
971 | ||
972 | static acpi_status __init | |
973 | acpi_fake_ecdt_callback ( | |
974 | acpi_handle handle, | |
975 | u32 Level, | |
976 | void *context, | |
977 | void **retval) | |
978 | { | |
979 | acpi_status status; | |
980 | ||
981 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
982 | acpi_ec_io_ports, ec_ecdt); | |
983 | if (ACPI_FAILURE(status)) | |
984 | return status; | |
985 | ec_ecdt->status_addr = ec_ecdt->command_addr; | |
986 | ||
987 | ec_ecdt->uid = -1; | |
988 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
989 | ||
990 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); | |
991 | if (ACPI_FAILURE(status)) | |
992 | return status; | |
1da177e4 LT |
993 | ec_ecdt->global_lock = TRUE; |
994 | ec_ecdt->handle = handle; | |
995 | ||
996 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", | |
997 | (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, | |
998 | (u32) ec_ecdt->data_addr.address); | |
999 | ||
1000 | return AE_CTRL_TERMINATE; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1005 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1006 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1007 | * required, but if EC regison is accessed early, it is required. | |
1008 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1009 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1010 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1011 | * all systems found. | |
1012 | */ | |
1013 | static int __init | |
1014 | acpi_ec_fake_ecdt(void) | |
1015 | { | |
1016 | acpi_status status; | |
1017 | int ret = 0; | |
1018 | ||
1019 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1020 | ||
1021 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1022 | if (!ec_ecdt) { | |
1023 | ret = -ENOMEM; | |
1024 | goto error; | |
1025 | } | |
1026 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1027 | ||
1028 | status = acpi_get_devices (ACPI_EC_HID, | |
1029 | acpi_fake_ecdt_callback, | |
1030 | NULL, | |
1031 | NULL); | |
1032 | if (ACPI_FAILURE(status)) { | |
1033 | kfree(ec_ecdt); | |
1034 | ec_ecdt = NULL; | |
1035 | ret = -ENODEV; | |
1036 | goto error; | |
1037 | } | |
1038 | return 0; | |
1039 | error: | |
1040 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); | |
1041 | return ret; | |
1042 | } | |
1043 | ||
1044 | static int __init | |
1045 | acpi_ec_get_real_ecdt(void) | |
1046 | { | |
1047 | acpi_status status; | |
1048 | struct acpi_table_ecdt *ecdt_ptr; | |
1049 | ||
451566f4 | 1050 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1da177e4 LT |
1051 | (struct acpi_table_header **) &ecdt_ptr); |
1052 | if (ACPI_FAILURE(status)) | |
1053 | return -ENODEV; | |
1054 | ||
1055 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1056 | ||
1057 | /* | |
1058 | * Generate a temporary ec context to use until the namespace is scanned | |
1059 | */ | |
1060 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1061 | if (!ec_ecdt) | |
1062 | return -ENOMEM; | |
1063 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1064 | ||
451566f4 DT |
1065 | init_MUTEX(&ec_ecdt->sem); |
1066 | init_waitqueue_head(&ec_ecdt->wait); | |
1da177e4 LT |
1067 | ec_ecdt->command_addr = ecdt_ptr->ec_control; |
1068 | ec_ecdt->status_addr = ecdt_ptr->ec_control; | |
1069 | ec_ecdt->data_addr = ecdt_ptr->ec_data; | |
1070 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 LT |
1071 | /* use the GL just to be safe */ |
1072 | ec_ecdt->global_lock = TRUE; | |
1073 | ec_ecdt->uid = ecdt_ptr->uid; | |
1074 | ||
1075 | status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); | |
1076 | if (ACPI_FAILURE(status)) { | |
1077 | goto error; | |
1078 | } | |
1079 | ||
1080 | return 0; | |
1081 | error: | |
1082 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1083 | kfree(ec_ecdt); | |
1084 | ec_ecdt = NULL; | |
1085 | ||
1086 | return -ENODEV; | |
1087 | } | |
1088 | ||
1089 | static int __initdata acpi_fake_ecdt_enabled; | |
1090 | int __init | |
1091 | acpi_ec_ecdt_probe (void) | |
1092 | { | |
1093 | acpi_status status; | |
1094 | int ret; | |
1095 | ||
1096 | ret = acpi_ec_get_real_ecdt(); | |
1097 | /* Try to make a fake ECDT */ | |
1098 | if (ret && acpi_fake_ecdt_enabled) { | |
1099 | ret = acpi_ec_fake_ecdt(); | |
1100 | } | |
1101 | ||
1102 | if (ret) | |
1103 | return 0; | |
1104 | ||
1105 | /* | |
1106 | * Install GPE handler | |
1107 | */ | |
1108 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1109 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, | |
1110 | ec_ecdt); | |
1111 | if (ACPI_FAILURE(status)) { | |
1112 | goto error; | |
1113 | } | |
1114 | acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
1115 | acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
1116 | ||
1117 | status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT, | |
1118 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
1119 | &acpi_ec_space_setup, ec_ecdt); | |
1120 | if (ACPI_FAILURE(status)) { | |
1121 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1122 | &acpi_ec_gpe_handler); | |
1123 | goto error; | |
1124 | } | |
1125 | ||
1126 | return 0; | |
1127 | ||
1128 | error: | |
1129 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1130 | kfree(ec_ecdt); | |
1131 | ec_ecdt = NULL; | |
1132 | ||
1133 | return -ENODEV; | |
1134 | } | |
1135 | ||
1136 | ||
1137 | static int __init acpi_ec_init (void) | |
1138 | { | |
451566f4 | 1139 | int result; |
1da177e4 LT |
1140 | |
1141 | ACPI_FUNCTION_TRACE("acpi_ec_init"); | |
1142 | ||
1143 | if (acpi_disabled) | |
1144 | return_VALUE(0); | |
1145 | ||
1146 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1147 | if (!acpi_ec_dir) | |
1148 | return_VALUE(-ENODEV); | |
1149 | ||
1150 | /* Now register the driver for the EC */ | |
1151 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1152 | if (result < 0) { | |
1153 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1154 | return_VALUE(-ENODEV); | |
1155 | } | |
1156 | ||
1157 | return_VALUE(result); | |
1158 | } | |
1159 | ||
1160 | subsys_initcall(acpi_ec_init); | |
1161 | ||
1162 | /* EC driver currently not unloadable */ | |
1163 | #if 0 | |
1164 | static void __exit | |
1165 | acpi_ec_exit (void) | |
1166 | { | |
1167 | ACPI_FUNCTION_TRACE("acpi_ec_exit"); | |
1168 | ||
1169 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1170 | ||
1171 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1172 | ||
1173 | return_VOID; | |
1174 | } | |
1175 | #endif /* 0 */ | |
1176 | ||
1177 | static int __init acpi_fake_ecdt_setup(char *str) | |
1178 | { | |
1179 | acpi_fake_ecdt_enabled = 1; | |
1180 | return 0; | |
1181 | } | |
1182 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |