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[ACPI] Lindent all ACPI files
[deliverable/linux.git] / drivers / acpi / ec.c
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>
34 #include <linux/interrupt.h>
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 #define ACPI_EC_COMPONENT 0x00100000
43 #define ACPI_EC_CLASS "embedded_controller"
44 #define ACPI_EC_HID "PNP0C09"
45 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
46 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
47 #define ACPI_EC_FILE_INFO "info"
48 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
49 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
50 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
51 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
52 #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
53 #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
54 #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
55 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
56 #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
57 #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */
58 #define ACPI_EC_COMMAND_READ 0x80
59 #define ACPI_EC_COMMAND_WRITE 0x81
60 #define ACPI_EC_BURST_ENABLE 0x82
61 #define ACPI_EC_BURST_DISABLE 0x83
62 #define ACPI_EC_COMMAND_QUERY 0x84
63 #define EC_POLLING 0xFF
64 #define EC_BURST 0x00
65 static int acpi_ec_remove(struct acpi_device *device, int type);
66 static int acpi_ec_start(struct acpi_device *device);
67 static int acpi_ec_stop(struct acpi_device *device, int type);
68 static int acpi_ec_burst_add(struct acpi_device *device);
69 static int acpi_ec_polling_add(struct acpi_device *device);
70
71 static struct acpi_driver acpi_ec_driver = {
72 .name = ACPI_EC_DRIVER_NAME,
73 .class = ACPI_EC_CLASS,
74 .ids = ACPI_EC_HID,
75 .ops = {
76 .add = acpi_ec_polling_add,
77 .remove = acpi_ec_remove,
78 .start = acpi_ec_start,
79 .stop = acpi_ec_stop,
80 },
81 };
82 union acpi_ec {
83 struct {
84 u32 mode;
85 acpi_handle handle;
86 unsigned long uid;
87 unsigned long gpe_bit;
88 struct acpi_generic_address status_addr;
89 struct acpi_generic_address command_addr;
90 struct acpi_generic_address data_addr;
91 unsigned long global_lock;
92 } common;
93
94 struct {
95 u32 mode;
96 acpi_handle handle;
97 unsigned long uid;
98 unsigned long gpe_bit;
99 struct acpi_generic_address status_addr;
100 struct acpi_generic_address command_addr;
101 struct acpi_generic_address data_addr;
102 unsigned long global_lock;
103 unsigned int expect_event;
104 atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
105 atomic_t pending_gpe;
106 struct semaphore sem;
107 wait_queue_head_t wait;
108 } burst;
109
110 struct {
111 u32 mode;
112 acpi_handle handle;
113 unsigned long uid;
114 unsigned long gpe_bit;
115 struct acpi_generic_address status_addr;
116 struct acpi_generic_address command_addr;
117 struct acpi_generic_address data_addr;
118 unsigned long global_lock;
119 spinlock_t lock;
120 } polling;
121 };
122
123 static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event);
124 static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event);
125 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data);
126 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data);
127 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data);
128 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data);
129 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data);
130 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data);
131 static void acpi_ec_gpe_polling_query(void *ec_cxt);
132 static void acpi_ec_gpe_burst_query(void *ec_cxt);
133 static u32 acpi_ec_gpe_polling_handler(void *data);
134 static u32 acpi_ec_gpe_burst_handler(void *data);
135 static acpi_status __init
136 acpi_fake_ecdt_polling_callback(acpi_handle handle,
137 u32 Level, void *context, void **retval);
138
139 static acpi_status __init
140 acpi_fake_ecdt_burst_callback(acpi_handle handle,
141 u32 Level, void *context, void **retval);
142
143 static int __init acpi_ec_polling_get_real_ecdt(void);
144 static int __init acpi_ec_burst_get_real_ecdt(void);
145 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
146 static union acpi_ec *ec_ecdt;
147
148 /* External interfaces use first EC only, so remember */
149 static struct acpi_device *first_ec;
150 static int acpi_ec_polling_mode = EC_POLLING;
151
152 /* --------------------------------------------------------------------------
153 Transaction Management
154 -------------------------------------------------------------------------- */
155
156 static inline u32 acpi_ec_read_status(union acpi_ec *ec)
157 {
158 u32 status = 0;
159
160 acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
161 return status;
162 }
163
164 static int acpi_ec_wait(union acpi_ec *ec, u8 event)
165 {
166 if (acpi_ec_polling_mode)
167 return acpi_ec_polling_wait(ec, event);
168 else
169 return acpi_ec_burst_wait(ec, event);
170 }
171
172 static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event)
173 {
174 u32 acpi_ec_status = 0;
175 u32 i = ACPI_EC_UDELAY_COUNT;
176
177 if (!ec)
178 return -EINVAL;
179
180 /* Poll the EC status register waiting for the event to occur. */
181 switch (event) {
182 case ACPI_EC_EVENT_OBF:
183 do {
184 acpi_hw_low_level_read(8, &acpi_ec_status,
185 &ec->common.status_addr);
186 if (acpi_ec_status & ACPI_EC_FLAG_OBF)
187 return 0;
188 udelay(ACPI_EC_UDELAY);
189 } while (--i > 0);
190 break;
191 case ACPI_EC_EVENT_IBE:
192 do {
193 acpi_hw_low_level_read(8, &acpi_ec_status,
194 &ec->common.status_addr);
195 if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
196 return 0;
197 udelay(ACPI_EC_UDELAY);
198 } while (--i > 0);
199 break;
200 default:
201 return -EINVAL;
202 }
203
204 return -ETIME;
205 }
206 static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event)
207 {
208 int result = 0;
209
210 ACPI_FUNCTION_TRACE("acpi_ec_wait");
211
212 ec->burst.expect_event = event;
213 smp_mb();
214
215 result = wait_event_interruptible_timeout(ec->burst.wait,
216 !ec->burst.expect_event,
217 msecs_to_jiffies
218 (ACPI_EC_DELAY));
219
220 ec->burst.expect_event = 0;
221 smp_mb();
222
223 if (result < 0) {
224 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, " result = %d ", result));
225 return_VALUE(result);
226 }
227
228 /*
229 * Verify that the event in question has actually happened by
230 * querying EC status. Do the check even if operation timed-out
231 * to make sure that we did not miss interrupt.
232 */
233 switch (event) {
234 case ACPI_EC_EVENT_OBF:
235 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
236 return_VALUE(0);
237 break;
238
239 case ACPI_EC_EVENT_IBE:
240 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
241 return_VALUE(0);
242 break;
243 }
244
245 return_VALUE(-ETIME);
246 }
247
248 static int acpi_ec_enter_burst_mode(union acpi_ec *ec)
249 {
250 u32 tmp = 0;
251 int status = 0;
252
253 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
254
255 status = acpi_ec_read_status(ec);
256 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
257 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
258 &ec->common.command_addr);
259 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
260 if (status) {
261 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
262 return_VALUE(-EINVAL);
263 }
264 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
265 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
266 if (tmp != 0x90) { /* Burst ACK byte */
267 return_VALUE(-EINVAL);
268 }
269 }
270
271 atomic_set(&ec->burst.leaving_burst, 0);
272 return_VALUE(0);
273 }
274
275 static int acpi_ec_leave_burst_mode(union acpi_ec *ec)
276 {
277 int status = 0;
278
279 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
280
281 atomic_set(&ec->burst.leaving_burst, 1);
282 status = acpi_ec_read_status(ec);
283 if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
284 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE,
285 &ec->common.command_addr);
286 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
287 if (status) {
288 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
289 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
290 "------->wait fail\n"));
291 return_VALUE(-EINVAL);
292 }
293 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
294 status = acpi_ec_read_status(ec);
295 }
296
297 return_VALUE(0);
298 }
299
300 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
301 {
302 if (acpi_ec_polling_mode)
303 return acpi_ec_polling_read(ec, address, data);
304 else
305 return acpi_ec_burst_read(ec, address, data);
306 }
307 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
308 {
309 if (acpi_ec_polling_mode)
310 return acpi_ec_polling_write(ec, address, data);
311 else
312 return acpi_ec_burst_write(ec, address, data);
313 }
314 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data)
315 {
316 acpi_status status = AE_OK;
317 int result = 0;
318 unsigned long flags = 0;
319 u32 glk = 0;
320
321 ACPI_FUNCTION_TRACE("acpi_ec_read");
322
323 if (!ec || !data)
324 return_VALUE(-EINVAL);
325
326 *data = 0;
327
328 if (ec->common.global_lock) {
329 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
330 if (ACPI_FAILURE(status))
331 return_VALUE(-ENODEV);
332 }
333
334 spin_lock_irqsave(&ec->polling.lock, flags);
335
336 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
337 &ec->common.command_addr);
338 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
339 if (result)
340 goto end;
341
342 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
343 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
344 if (result)
345 goto end;
346
347 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
348
349 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
350 *data, address));
351
352 end:
353 spin_unlock_irqrestore(&ec->polling.lock, flags);
354
355 if (ec->common.global_lock)
356 acpi_release_global_lock(glk);
357
358 return_VALUE(result);
359 }
360
361 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data)
362 {
363 int result = 0;
364 acpi_status status = AE_OK;
365 unsigned long flags = 0;
366 u32 glk = 0;
367
368 ACPI_FUNCTION_TRACE("acpi_ec_write");
369
370 if (!ec)
371 return_VALUE(-EINVAL);
372
373 if (ec->common.global_lock) {
374 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
375 if (ACPI_FAILURE(status))
376 return_VALUE(-ENODEV);
377 }
378
379 spin_lock_irqsave(&ec->polling.lock, flags);
380
381 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
382 &ec->common.command_addr);
383 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
384 if (result)
385 goto end;
386
387 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
388 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
389 if (result)
390 goto end;
391
392 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
393 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
394 if (result)
395 goto end;
396
397 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
398 data, address));
399
400 end:
401 spin_unlock_irqrestore(&ec->polling.lock, flags);
402
403 if (ec->common.global_lock)
404 acpi_release_global_lock(glk);
405
406 return_VALUE(result);
407 }
408
409 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data)
410 {
411 int status = 0;
412 u32 glk;
413
414 ACPI_FUNCTION_TRACE("acpi_ec_read");
415
416 if (!ec || !data)
417 return_VALUE(-EINVAL);
418
419 retry:
420 *data = 0;
421
422 if (ec->common.global_lock) {
423 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
424 if (ACPI_FAILURE(status))
425 return_VALUE(-ENODEV);
426 }
427
428 WARN_ON(in_interrupt());
429 down(&ec->burst.sem);
430
431 if (acpi_ec_enter_burst_mode(ec))
432 goto end;
433
434 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
435 &ec->common.command_addr);
436 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
437 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
438 if (status) {
439 goto end;
440 }
441
442 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
443 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
444 if (status) {
445 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
446 goto end;
447 }
448
449 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
450 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
451
452 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
453 *data, address));
454
455 end:
456 acpi_ec_leave_burst_mode(ec);
457 up(&ec->burst.sem);
458
459 if (ec->common.global_lock)
460 acpi_release_global_lock(glk);
461
462 if (atomic_read(&ec->burst.leaving_burst) == 2) {
463 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
464 while (atomic_read(&ec->burst.pending_gpe)) {
465 msleep(1);
466 }
467 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
468 goto retry;
469 }
470
471 return_VALUE(status);
472 }
473
474 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data)
475 {
476 int status = 0;
477 u32 glk;
478 u32 tmp;
479
480 ACPI_FUNCTION_TRACE("acpi_ec_write");
481
482 if (!ec)
483 return_VALUE(-EINVAL);
484 retry:
485 if (ec->common.global_lock) {
486 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
487 if (ACPI_FAILURE(status))
488 return_VALUE(-ENODEV);
489 }
490
491 WARN_ON(in_interrupt());
492 down(&ec->burst.sem);
493
494 if (acpi_ec_enter_burst_mode(ec))
495 goto end;
496
497 status = acpi_ec_read_status(ec);
498 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
499 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
500 &ec->common.command_addr);
501 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
502 if (status)
503 goto end;
504 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
505 if (tmp != 0x90) /* Burst ACK byte */
506 goto end;
507 }
508 /*Now we are in burst mode */
509
510 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
511 &ec->common.command_addr);
512 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
513 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
514 if (status) {
515 goto end;
516 }
517
518 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
519 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
520 if (status) {
521 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
522 goto end;
523 }
524
525 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
526 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
527 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
528 if (status)
529 goto end;
530
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
532 data, address));
533
534 end:
535 acpi_ec_leave_burst_mode(ec);
536 up(&ec->burst.sem);
537
538 if (ec->common.global_lock)
539 acpi_release_global_lock(glk);
540
541 if (atomic_read(&ec->burst.leaving_burst) == 2) {
542 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
543 while (atomic_read(&ec->burst.pending_gpe)) {
544 msleep(1);
545 }
546 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
547 goto retry;
548 }
549
550 return_VALUE(status);
551 }
552
553 /*
554 * Externally callable EC access functions. For now, assume 1 EC only
555 */
556 int ec_read(u8 addr, u8 * val)
557 {
558 union acpi_ec *ec;
559 int err;
560 u32 temp_data;
561
562 if (!first_ec)
563 return -ENODEV;
564
565 ec = acpi_driver_data(first_ec);
566
567 err = acpi_ec_read(ec, addr, &temp_data);
568
569 if (!err) {
570 *val = temp_data;
571 return 0;
572 } else
573 return err;
574 }
575
576 EXPORT_SYMBOL(ec_read);
577
578 int ec_write(u8 addr, u8 val)
579 {
580 union acpi_ec *ec;
581 int err;
582
583 if (!first_ec)
584 return -ENODEV;
585
586 ec = acpi_driver_data(first_ec);
587
588 err = acpi_ec_write(ec, addr, val);
589
590 return err;
591 }
592
593 EXPORT_SYMBOL(ec_write);
594
595 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
596 {
597 if (acpi_ec_polling_mode)
598 return acpi_ec_polling_query(ec, data);
599 else
600 return acpi_ec_burst_query(ec, data);
601 }
602 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data)
603 {
604 int result = 0;
605 acpi_status status = AE_OK;
606 unsigned long flags = 0;
607 u32 glk = 0;
608
609 ACPI_FUNCTION_TRACE("acpi_ec_query");
610
611 if (!ec || !data)
612 return_VALUE(-EINVAL);
613
614 *data = 0;
615
616 if (ec->common.global_lock) {
617 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
618 if (ACPI_FAILURE(status))
619 return_VALUE(-ENODEV);
620 }
621
622 /*
623 * Query the EC to find out which _Qxx method we need to evaluate.
624 * Note that successful completion of the query causes the ACPI_EC_SCI
625 * bit to be cleared (and thus clearing the interrupt source).
626 */
627 spin_lock_irqsave(&ec->polling.lock, flags);
628
629 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
630 &ec->common.command_addr);
631 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
632 if (result)
633 goto end;
634
635 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
636 if (!*data)
637 result = -ENODATA;
638
639 end:
640 spin_unlock_irqrestore(&ec->polling.lock, flags);
641
642 if (ec->common.global_lock)
643 acpi_release_global_lock(glk);
644
645 return_VALUE(result);
646 }
647 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data)
648 {
649 int status = 0;
650 u32 glk;
651
652 ACPI_FUNCTION_TRACE("acpi_ec_query");
653
654 if (!ec || !data)
655 return_VALUE(-EINVAL);
656 *data = 0;
657
658 if (ec->common.global_lock) {
659 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
660 if (ACPI_FAILURE(status))
661 return_VALUE(-ENODEV);
662 }
663
664 down(&ec->burst.sem);
665 if (acpi_ec_enter_burst_mode(ec))
666 goto end;
667 /*
668 * Query the EC to find out which _Qxx method we need to evaluate.
669 * Note that successful completion of the query causes the ACPI_EC_SCI
670 * bit to be cleared (and thus clearing the interrupt source).
671 */
672 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
673 &ec->common.command_addr);
674 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
675 if (status) {
676 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
677 goto end;
678 }
679
680 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
681 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
682 if (!*data)
683 status = -ENODATA;
684
685 end:
686 acpi_ec_leave_burst_mode(ec);
687 up(&ec->burst.sem);
688
689 if (ec->common.global_lock)
690 acpi_release_global_lock(glk);
691
692 if (atomic_read(&ec->burst.leaving_burst) == 2) {
693 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
694 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
695 status = -ENODATA;
696 }
697 return_VALUE(status);
698 }
699
700 /* --------------------------------------------------------------------------
701 Event Management
702 -------------------------------------------------------------------------- */
703
704 union acpi_ec_query_data {
705 acpi_handle handle;
706 u8 data;
707 };
708
709 static void acpi_ec_gpe_query(void *ec_cxt)
710 {
711 if (acpi_ec_polling_mode)
712 acpi_ec_gpe_polling_query(ec_cxt);
713 else
714 acpi_ec_gpe_burst_query(ec_cxt);
715 }
716
717 static void acpi_ec_gpe_polling_query(void *ec_cxt)
718 {
719 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
720 u32 value = 0;
721 unsigned long flags = 0;
722 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
723 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
724 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
725 };
726
727 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
728
729 if (!ec_cxt)
730 goto end;
731
732 spin_lock_irqsave(&ec->polling.lock, flags);
733 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
734 spin_unlock_irqrestore(&ec->polling.lock, flags);
735
736 /* TBD: Implement asynch events!
737 * NOTE: All we care about are EC-SCI's. Other EC events are
738 * handled via polling (yuck!). This is because some systems
739 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
740 * a purely interrupt-driven approach (grumble, grumble).
741 */
742 if (!(value & ACPI_EC_FLAG_SCI))
743 goto end;
744
745 if (acpi_ec_query(ec, &value))
746 goto end;
747
748 object_name[2] = hex[((value >> 4) & 0x0F)];
749 object_name[3] = hex[(value & 0x0F)];
750
751 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
752
753 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
754
755 end:
756 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
757 }
758 static void acpi_ec_gpe_burst_query(void *ec_cxt)
759 {
760 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
761 u32 value;
762 int result = -ENODATA;
763 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
764 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
765 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
766 };
767
768 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
769
770 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
771 result = acpi_ec_query(ec, &value);
772
773 if (result)
774 goto end;
775
776 object_name[2] = hex[((value >> 4) & 0x0F)];
777 object_name[3] = hex[(value & 0x0F)];
778
779 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
780
781 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
782 end:
783 atomic_dec(&ec->burst.pending_gpe);
784 return;
785 }
786
787 static u32 acpi_ec_gpe_handler(void *data)
788 {
789 if (acpi_ec_polling_mode)
790 return acpi_ec_gpe_polling_handler(data);
791 else
792 return acpi_ec_gpe_burst_handler(data);
793 }
794 static u32 acpi_ec_gpe_polling_handler(void *data)
795 {
796 acpi_status status = AE_OK;
797 union acpi_ec *ec = (union acpi_ec *)data;
798
799 if (!ec)
800 return ACPI_INTERRUPT_NOT_HANDLED;
801
802 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
803
804 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
805 acpi_ec_gpe_query, ec);
806
807 if (status == AE_OK)
808 return ACPI_INTERRUPT_HANDLED;
809 else
810 return ACPI_INTERRUPT_NOT_HANDLED;
811 }
812 static u32 acpi_ec_gpe_burst_handler(void *data)
813 {
814 acpi_status status = AE_OK;
815 u32 value;
816 union acpi_ec *ec = (union acpi_ec *)data;
817
818 if (!ec)
819 return ACPI_INTERRUPT_NOT_HANDLED;
820
821 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
822
823 value = acpi_ec_read_status(ec);
824
825 if ((value & ACPI_EC_FLAG_IBF) &&
826 !(value & ACPI_EC_FLAG_BURST) &&
827 (atomic_read(&ec->burst.leaving_burst) == 0)) {
828 /*
829 * the embedded controller disables
830 * burst mode for any reason other
831 * than the burst disable command
832 * to process critical event.
833 */
834 atomic_set(&ec->burst.leaving_burst, 2); /* block current pending transaction
835 and retry */
836 wake_up(&ec->burst.wait);
837 } else {
838 if ((ec->burst.expect_event == ACPI_EC_EVENT_OBF &&
839 (value & ACPI_EC_FLAG_OBF)) ||
840 (ec->burst.expect_event == ACPI_EC_EVENT_IBE &&
841 !(value & ACPI_EC_FLAG_IBF))) {
842 ec->burst.expect_event = 0;
843 wake_up(&ec->burst.wait);
844 return ACPI_INTERRUPT_HANDLED;
845 }
846 }
847
848 if (value & ACPI_EC_FLAG_SCI) {
849 atomic_add(1, &ec->burst.pending_gpe);
850 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
851 acpi_ec_gpe_query, ec);
852 return status == AE_OK ?
853 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
854 }
855 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
856 return status == AE_OK ?
857 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
858 }
859
860 /* --------------------------------------------------------------------------
861 Address Space Management
862 -------------------------------------------------------------------------- */
863
864 static acpi_status
865 acpi_ec_space_setup(acpi_handle region_handle,
866 u32 function, void *handler_context, void **return_context)
867 {
868 /*
869 * The EC object is in the handler context and is needed
870 * when calling the acpi_ec_space_handler.
871 */
872 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
873 handler_context : NULL;
874
875 return AE_OK;
876 }
877
878 static acpi_status
879 acpi_ec_space_handler(u32 function,
880 acpi_physical_address address,
881 u32 bit_width,
882 acpi_integer * value,
883 void *handler_context, void *region_context)
884 {
885 int result = 0;
886 union acpi_ec *ec = NULL;
887 u64 temp = *value;
888 acpi_integer f_v = 0;
889 int i = 0;
890
891 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
892
893 if ((address > 0xFF) || !value || !handler_context)
894 return_VALUE(AE_BAD_PARAMETER);
895
896 if (bit_width != 8 && acpi_strict) {
897 printk(KERN_WARNING PREFIX
898 "acpi_ec_space_handler: bit_width should be 8\n");
899 return_VALUE(AE_BAD_PARAMETER);
900 }
901
902 ec = (union acpi_ec *)handler_context;
903
904 next_byte:
905 switch (function) {
906 case ACPI_READ:
907 temp = 0;
908 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
909 break;
910 case ACPI_WRITE:
911 result = acpi_ec_write(ec, (u8) address, (u8) temp);
912 break;
913 default:
914 result = -EINVAL;
915 goto out;
916 break;
917 }
918
919 bit_width -= 8;
920 if (bit_width) {
921 if (function == ACPI_READ)
922 f_v |= temp << 8 * i;
923 if (function == ACPI_WRITE)
924 temp >>= 8;
925 i++;
926 address++;
927 goto next_byte;
928 }
929
930 if (function == ACPI_READ) {
931 f_v |= temp << 8 * i;
932 *value = f_v;
933 }
934
935 out:
936 switch (result) {
937 case -EINVAL:
938 return_VALUE(AE_BAD_PARAMETER);
939 break;
940 case -ENODEV:
941 return_VALUE(AE_NOT_FOUND);
942 break;
943 case -ETIME:
944 return_VALUE(AE_TIME);
945 break;
946 default:
947 return_VALUE(AE_OK);
948 }
949 }
950
951 /* --------------------------------------------------------------------------
952 FS Interface (/proc)
953 -------------------------------------------------------------------------- */
954
955 static struct proc_dir_entry *acpi_ec_dir;
956
957 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
958 {
959 union acpi_ec *ec = (union acpi_ec *)seq->private;
960
961 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
962
963 if (!ec)
964 goto end;
965
966 seq_printf(seq, "gpe bit: 0x%02x\n",
967 (u32) ec->common.gpe_bit);
968 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
969 (u32) ec->common.status_addr.address,
970 (u32) ec->common.data_addr.address);
971 seq_printf(seq, "use global lock: %s\n",
972 ec->common.global_lock ? "yes" : "no");
973 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
974
975 end:
976 return_VALUE(0);
977 }
978
979 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
980 {
981 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
982 }
983
984 static struct file_operations acpi_ec_info_ops = {
985 .open = acpi_ec_info_open_fs,
986 .read = seq_read,
987 .llseek = seq_lseek,
988 .release = single_release,
989 .owner = THIS_MODULE,
990 };
991
992 static int acpi_ec_add_fs(struct acpi_device *device)
993 {
994 struct proc_dir_entry *entry = NULL;
995
996 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
997
998 if (!acpi_device_dir(device)) {
999 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1000 acpi_ec_dir);
1001 if (!acpi_device_dir(device))
1002 return_VALUE(-ENODEV);
1003 }
1004
1005 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
1006 acpi_device_dir(device));
1007 if (!entry)
1008 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1009 "Unable to create '%s' fs entry\n",
1010 ACPI_EC_FILE_INFO));
1011 else {
1012 entry->proc_fops = &acpi_ec_info_ops;
1013 entry->data = acpi_driver_data(device);
1014 entry->owner = THIS_MODULE;
1015 }
1016
1017 return_VALUE(0);
1018 }
1019
1020 static int acpi_ec_remove_fs(struct acpi_device *device)
1021 {
1022 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
1023
1024 if (acpi_device_dir(device)) {
1025 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
1026 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
1027 acpi_device_dir(device) = NULL;
1028 }
1029
1030 return_VALUE(0);
1031 }
1032
1033 /* --------------------------------------------------------------------------
1034 Driver Interface
1035 -------------------------------------------------------------------------- */
1036
1037 static int acpi_ec_polling_add(struct acpi_device *device)
1038 {
1039 int result = 0;
1040 acpi_status status = AE_OK;
1041 union acpi_ec *ec = NULL;
1042 unsigned long uid;
1043
1044 ACPI_FUNCTION_TRACE("acpi_ec_add");
1045
1046 if (!device)
1047 return_VALUE(-EINVAL);
1048
1049 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1050 if (!ec)
1051 return_VALUE(-ENOMEM);
1052 memset(ec, 0, sizeof(union acpi_ec));
1053
1054 ec->common.handle = device->handle;
1055 ec->common.uid = -1;
1056 spin_lock_init(&ec->polling.lock);
1057 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1058 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1059 acpi_driver_data(device) = ec;
1060
1061 /* Use the global lock for all EC transactions? */
1062 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1063 &ec->common.global_lock);
1064
1065 /* If our UID matches the UID for the ECDT-enumerated EC,
1066 we now have the *real* EC info, so kill the makeshift one. */
1067 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1068 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1069 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1070 ACPI_ADR_SPACE_EC,
1071 &acpi_ec_space_handler);
1072
1073 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1074 &acpi_ec_gpe_handler);
1075
1076 kfree(ec_ecdt);
1077 }
1078
1079 /* Get GPE bit assignment (EC events). */
1080 /* TODO: Add support for _GPE returning a package */
1081 status =
1082 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1083 &ec->common.gpe_bit);
1084 if (ACPI_FAILURE(status)) {
1085 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1086 "Error obtaining GPE bit assignment\n"));
1087 result = -ENODEV;
1088 goto end;
1089 }
1090
1091 result = acpi_ec_add_fs(device);
1092 if (result)
1093 goto end;
1094
1095 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1096 acpi_device_name(device), acpi_device_bid(device),
1097 (u32) ec->common.gpe_bit);
1098
1099 if (!first_ec)
1100 first_ec = device;
1101
1102 end:
1103 if (result)
1104 kfree(ec);
1105
1106 return_VALUE(result);
1107 }
1108 static int acpi_ec_burst_add(struct acpi_device *device)
1109 {
1110 int result = 0;
1111 acpi_status status = AE_OK;
1112 union acpi_ec *ec = NULL;
1113 unsigned long uid;
1114
1115 ACPI_FUNCTION_TRACE("acpi_ec_add");
1116
1117 if (!device)
1118 return_VALUE(-EINVAL);
1119
1120 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1121 if (!ec)
1122 return_VALUE(-ENOMEM);
1123 memset(ec, 0, sizeof(union acpi_ec));
1124
1125 ec->common.handle = device->handle;
1126 ec->common.uid = -1;
1127 atomic_set(&ec->burst.pending_gpe, 0);
1128 atomic_set(&ec->burst.leaving_burst, 1);
1129 init_MUTEX(&ec->burst.sem);
1130 init_waitqueue_head(&ec->burst.wait);
1131 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1132 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1133 acpi_driver_data(device) = ec;
1134
1135 /* Use the global lock for all EC transactions? */
1136 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1137 &ec->common.global_lock);
1138
1139 /* If our UID matches the UID for the ECDT-enumerated EC,
1140 we now have the *real* EC info, so kill the makeshift one. */
1141 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1142 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1143 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1144 ACPI_ADR_SPACE_EC,
1145 &acpi_ec_space_handler);
1146
1147 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1148 &acpi_ec_gpe_handler);
1149
1150 kfree(ec_ecdt);
1151 }
1152
1153 /* Get GPE bit assignment (EC events). */
1154 /* TODO: Add support for _GPE returning a package */
1155 status =
1156 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1157 &ec->common.gpe_bit);
1158 if (ACPI_FAILURE(status)) {
1159 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1160 "Error obtaining GPE bit assignment\n"));
1161 result = -ENODEV;
1162 goto end;
1163 }
1164
1165 result = acpi_ec_add_fs(device);
1166 if (result)
1167 goto end;
1168
1169 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1170 acpi_device_name(device), acpi_device_bid(device),
1171 (u32) ec->common.gpe_bit);
1172
1173 if (!first_ec)
1174 first_ec = device;
1175
1176 end:
1177 if (result)
1178 kfree(ec);
1179
1180 return_VALUE(result);
1181 }
1182
1183 static int acpi_ec_remove(struct acpi_device *device, int type)
1184 {
1185 union acpi_ec *ec = NULL;
1186
1187 ACPI_FUNCTION_TRACE("acpi_ec_remove");
1188
1189 if (!device)
1190 return_VALUE(-EINVAL);
1191
1192 ec = acpi_driver_data(device);
1193
1194 acpi_ec_remove_fs(device);
1195
1196 kfree(ec);
1197
1198 return_VALUE(0);
1199 }
1200
1201 static acpi_status
1202 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1203 {
1204 union acpi_ec *ec = (union acpi_ec *)context;
1205 struct acpi_generic_address *addr;
1206
1207 if (resource->id != ACPI_RSTYPE_IO) {
1208 return AE_OK;
1209 }
1210
1211 /*
1212 * The first address region returned is the data port, and
1213 * the second address region returned is the status/command
1214 * port.
1215 */
1216 if (ec->common.data_addr.register_bit_width == 0) {
1217 addr = &ec->common.data_addr;
1218 } else if (ec->common.command_addr.register_bit_width == 0) {
1219 addr = &ec->common.command_addr;
1220 } else {
1221 return AE_CTRL_TERMINATE;
1222 }
1223
1224 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1225 addr->register_bit_width = 8;
1226 addr->register_bit_offset = 0;
1227 addr->address = resource->data.io.min_base_address;
1228
1229 return AE_OK;
1230 }
1231
1232 static int acpi_ec_start(struct acpi_device *device)
1233 {
1234 acpi_status status = AE_OK;
1235 union acpi_ec *ec = NULL;
1236
1237 ACPI_FUNCTION_TRACE("acpi_ec_start");
1238
1239 if (!device)
1240 return_VALUE(-EINVAL);
1241
1242 ec = acpi_driver_data(device);
1243
1244 if (!ec)
1245 return_VALUE(-EINVAL);
1246
1247 /*
1248 * Get I/O port addresses. Convert to GAS format.
1249 */
1250 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1251 acpi_ec_io_ports, ec);
1252 if (ACPI_FAILURE(status)
1253 || ec->common.command_addr.register_bit_width == 0) {
1254 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1255 "Error getting I/O port addresses"));
1256 return_VALUE(-ENODEV);
1257 }
1258
1259 ec->common.status_addr = ec->common.command_addr;
1260
1261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1262 (u32) ec->common.gpe_bit,
1263 (u32) ec->common.command_addr.address,
1264 (u32) ec->common.data_addr.address));
1265
1266 /*
1267 * Install GPE handler
1268 */
1269 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1270 ACPI_GPE_EDGE_TRIGGERED,
1271 &acpi_ec_gpe_handler, ec);
1272 if (ACPI_FAILURE(status)) {
1273 return_VALUE(-ENODEV);
1274 }
1275 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1276 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1277
1278 status = acpi_install_address_space_handler(ec->common.handle,
1279 ACPI_ADR_SPACE_EC,
1280 &acpi_ec_space_handler,
1281 &acpi_ec_space_setup, ec);
1282 if (ACPI_FAILURE(status)) {
1283 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1284 &acpi_ec_gpe_handler);
1285 return_VALUE(-ENODEV);
1286 }
1287
1288 return_VALUE(AE_OK);
1289 }
1290
1291 static int acpi_ec_stop(struct acpi_device *device, int type)
1292 {
1293 acpi_status status = AE_OK;
1294 union acpi_ec *ec = NULL;
1295
1296 ACPI_FUNCTION_TRACE("acpi_ec_stop");
1297
1298 if (!device)
1299 return_VALUE(-EINVAL);
1300
1301 ec = acpi_driver_data(device);
1302
1303 status = acpi_remove_address_space_handler(ec->common.handle,
1304 ACPI_ADR_SPACE_EC,
1305 &acpi_ec_space_handler);
1306 if (ACPI_FAILURE(status))
1307 return_VALUE(-ENODEV);
1308
1309 status =
1310 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1311 &acpi_ec_gpe_handler);
1312 if (ACPI_FAILURE(status))
1313 return_VALUE(-ENODEV);
1314
1315 return_VALUE(0);
1316 }
1317
1318 static acpi_status __init
1319 acpi_fake_ecdt_callback(acpi_handle handle,
1320 u32 Level, void *context, void **retval)
1321 {
1322
1323 if (acpi_ec_polling_mode)
1324 return acpi_fake_ecdt_polling_callback(handle,
1325 Level, context, retval);
1326 else
1327 return acpi_fake_ecdt_burst_callback(handle,
1328 Level, context, retval);
1329 }
1330
1331 static acpi_status __init
1332 acpi_fake_ecdt_polling_callback(acpi_handle handle,
1333 u32 Level, void *context, void **retval)
1334 {
1335 acpi_status status;
1336
1337 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1338 acpi_ec_io_ports, ec_ecdt);
1339 if (ACPI_FAILURE(status))
1340 return status;
1341 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1342
1343 ec_ecdt->common.uid = -1;
1344 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1345
1346 status =
1347 acpi_evaluate_integer(handle, "_GPE", NULL,
1348 &ec_ecdt->common.gpe_bit);
1349 if (ACPI_FAILURE(status))
1350 return status;
1351 spin_lock_init(&ec_ecdt->polling.lock);
1352 ec_ecdt->common.global_lock = TRUE;
1353 ec_ecdt->common.handle = handle;
1354
1355 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1356 (u32) ec_ecdt->common.gpe_bit,
1357 (u32) ec_ecdt->common.command_addr.address,
1358 (u32) ec_ecdt->common.data_addr.address);
1359
1360 return AE_CTRL_TERMINATE;
1361 }
1362
1363 static acpi_status __init
1364 acpi_fake_ecdt_burst_callback(acpi_handle handle,
1365 u32 Level, void *context, void **retval)
1366 {
1367 acpi_status status;
1368
1369 init_MUTEX(&ec_ecdt->burst.sem);
1370 init_waitqueue_head(&ec_ecdt->burst.wait);
1371 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1372 acpi_ec_io_ports, ec_ecdt);
1373 if (ACPI_FAILURE(status))
1374 return status;
1375 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1376
1377 ec_ecdt->common.uid = -1;
1378 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1379
1380 status =
1381 acpi_evaluate_integer(handle, "_GPE", NULL,
1382 &ec_ecdt->common.gpe_bit);
1383 if (ACPI_FAILURE(status))
1384 return status;
1385 ec_ecdt->common.global_lock = TRUE;
1386 ec_ecdt->common.handle = handle;
1387
1388 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1389 (u32) ec_ecdt->common.gpe_bit,
1390 (u32) ec_ecdt->common.command_addr.address,
1391 (u32) ec_ecdt->common.data_addr.address);
1392
1393 return AE_CTRL_TERMINATE;
1394 }
1395
1396 /*
1397 * Some BIOS (such as some from Gateway laptops) access EC region very early
1398 * such as in BAT0._INI or EC._INI before an EC device is found and
1399 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1400 * required, but if EC regison is accessed early, it is required.
1401 * The routine tries to workaround the BIOS bug by pre-scan EC device
1402 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1403 * op region (since _REG isn't invoked yet). The assumption is true for
1404 * all systems found.
1405 */
1406 static int __init acpi_ec_fake_ecdt(void)
1407 {
1408 acpi_status status;
1409 int ret = 0;
1410
1411 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1412
1413 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1414 if (!ec_ecdt) {
1415 ret = -ENOMEM;
1416 goto error;
1417 }
1418 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1419
1420 status = acpi_get_devices(ACPI_EC_HID,
1421 acpi_fake_ecdt_callback, NULL, NULL);
1422 if (ACPI_FAILURE(status)) {
1423 kfree(ec_ecdt);
1424 ec_ecdt = NULL;
1425 ret = -ENODEV;
1426 goto error;
1427 }
1428 return 0;
1429 error:
1430 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1431 return ret;
1432 }
1433
1434 static int __init acpi_ec_get_real_ecdt(void)
1435 {
1436 if (acpi_ec_polling_mode)
1437 return acpi_ec_polling_get_real_ecdt();
1438 else
1439 return acpi_ec_burst_get_real_ecdt();
1440 }
1441
1442 static int __init acpi_ec_polling_get_real_ecdt(void)
1443 {
1444 acpi_status status;
1445 struct acpi_table_ecdt *ecdt_ptr;
1446
1447 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1448 (struct acpi_table_header **)
1449 &ecdt_ptr);
1450 if (ACPI_FAILURE(status))
1451 return -ENODEV;
1452
1453 printk(KERN_INFO PREFIX "Found ECDT\n");
1454
1455 /*
1456 * Generate a temporary ec context to use until the namespace is scanned
1457 */
1458 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1459 if (!ec_ecdt)
1460 return -ENOMEM;
1461 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1462
1463 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1464 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1465 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1466 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1467 spin_lock_init(&ec_ecdt->polling.lock);
1468 /* use the GL just to be safe */
1469 ec_ecdt->common.global_lock = TRUE;
1470 ec_ecdt->common.uid = ecdt_ptr->uid;
1471
1472 status =
1473 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1474 if (ACPI_FAILURE(status)) {
1475 goto error;
1476 }
1477
1478 return 0;
1479 error:
1480 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1481 kfree(ec_ecdt);
1482 ec_ecdt = NULL;
1483
1484 return -ENODEV;
1485 }
1486
1487 static int __init acpi_ec_burst_get_real_ecdt(void)
1488 {
1489 acpi_status status;
1490 struct acpi_table_ecdt *ecdt_ptr;
1491
1492 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1493 (struct acpi_table_header **)
1494 &ecdt_ptr);
1495 if (ACPI_FAILURE(status))
1496 return -ENODEV;
1497
1498 printk(KERN_INFO PREFIX "Found ECDT\n");
1499
1500 /*
1501 * Generate a temporary ec context to use until the namespace is scanned
1502 */
1503 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1504 if (!ec_ecdt)
1505 return -ENOMEM;
1506 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1507
1508 init_MUTEX(&ec_ecdt->burst.sem);
1509 init_waitqueue_head(&ec_ecdt->burst.wait);
1510 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1511 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1512 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1513 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1514 /* use the GL just to be safe */
1515 ec_ecdt->common.global_lock = TRUE;
1516 ec_ecdt->common.uid = ecdt_ptr->uid;
1517
1518 status =
1519 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1520 if (ACPI_FAILURE(status)) {
1521 goto error;
1522 }
1523
1524 return 0;
1525 error:
1526 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1527 kfree(ec_ecdt);
1528 ec_ecdt = NULL;
1529
1530 return -ENODEV;
1531 }
1532
1533 static int __initdata acpi_fake_ecdt_enabled;
1534 int __init acpi_ec_ecdt_probe(void)
1535 {
1536 acpi_status status;
1537 int ret;
1538
1539 ret = acpi_ec_get_real_ecdt();
1540 /* Try to make a fake ECDT */
1541 if (ret && acpi_fake_ecdt_enabled) {
1542 ret = acpi_ec_fake_ecdt();
1543 }
1544
1545 if (ret)
1546 return 0;
1547
1548 /*
1549 * Install GPE handler
1550 */
1551 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1552 ACPI_GPE_EDGE_TRIGGERED,
1553 &acpi_ec_gpe_handler, ec_ecdt);
1554 if (ACPI_FAILURE(status)) {
1555 goto error;
1556 }
1557 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1558 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1559
1560 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1561 ACPI_ADR_SPACE_EC,
1562 &acpi_ec_space_handler,
1563 &acpi_ec_space_setup,
1564 ec_ecdt);
1565 if (ACPI_FAILURE(status)) {
1566 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1567 &acpi_ec_gpe_handler);
1568 goto error;
1569 }
1570
1571 return 0;
1572
1573 error:
1574 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1575 kfree(ec_ecdt);
1576 ec_ecdt = NULL;
1577
1578 return -ENODEV;
1579 }
1580
1581 static int __init acpi_ec_init(void)
1582 {
1583 int result = 0;
1584
1585 ACPI_FUNCTION_TRACE("acpi_ec_init");
1586
1587 if (acpi_disabled)
1588 return_VALUE(0);
1589
1590 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1591 if (!acpi_ec_dir)
1592 return_VALUE(-ENODEV);
1593
1594 /* Now register the driver for the EC */
1595 result = acpi_bus_register_driver(&acpi_ec_driver);
1596 if (result < 0) {
1597 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1598 return_VALUE(-ENODEV);
1599 }
1600
1601 return_VALUE(result);
1602 }
1603
1604 subsys_initcall(acpi_ec_init);
1605
1606 /* EC driver currently not unloadable */
1607 #if 0
1608 static void __exit acpi_ec_exit(void)
1609 {
1610 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1611
1612 acpi_bus_unregister_driver(&acpi_ec_driver);
1613
1614 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1615
1616 return_VOID;
1617 }
1618 #endif /* 0 */
1619
1620 static int __init acpi_fake_ecdt_setup(char *str)
1621 {
1622 acpi_fake_ecdt_enabled = 1;
1623 return 0;
1624 }
1625
1626 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1627 static int __init acpi_ec_set_polling_mode(char *str)
1628 {
1629 int burst;
1630
1631 if (!get_option(&str, &burst))
1632 return 0;
1633
1634 if (burst) {
1635 acpi_ec_polling_mode = EC_BURST;
1636 acpi_ec_driver.ops.add = acpi_ec_burst_add;
1637 } else {
1638 acpi_ec_polling_mode = EC_POLLING;
1639 acpi_ec_driver.ops.add = acpi_ec_polling_add;
1640 }
1641 printk(KERN_INFO PREFIX "EC %s mode.\n", burst ? "burst" : "polling");
1642 return 0;
1643 }
1644
1645 __setup("ec_burst=", acpi_ec_set_polling_mode);
Linux kernel - Deliverables
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