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Merge ../linus
[GitHub/mt8127/android_kernel_alcatel_ttab.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_POLL 0xFF
64 #define EC_INTR 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_intr_add(struct acpi_device *device);
69 static int acpi_ec_poll_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_intr_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 } intr;
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 struct semaphore sem;
120 } poll;
121 };
122
123 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
124 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
125 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data);
126 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data);
127 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data);
128 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data);
129 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data);
130 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data);
131 static void acpi_ec_gpe_poll_query(void *ec_cxt);
132 static void acpi_ec_gpe_intr_query(void *ec_cxt);
133 static u32 acpi_ec_gpe_poll_handler(void *data);
134 static u32 acpi_ec_gpe_intr_handler(void *data);
135 static acpi_status __init
136 acpi_fake_ecdt_poll_callback(acpi_handle handle,
137 u32 Level, void *context, void **retval);
138
139 static acpi_status __init
140 acpi_fake_ecdt_intr_callback(acpi_handle handle,
141 u32 Level, void *context, void **retval);
142
143 static int __init acpi_ec_poll_get_real_ecdt(void);
144 static int __init acpi_ec_intr_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_poll_mode = EC_INTR;
151
152 /* --------------------------------------------------------------------------
153 Transaction Management
154 -------------------------------------------------------------------------- */
155
156 static 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_poll_mode)
167 return acpi_ec_poll_wait(ec, event);
168 else
169 return acpi_ec_intr_wait(ec, event);
170 }
171
172 static int acpi_ec_poll_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_intr_wait(union acpi_ec *ec, unsigned int event)
207 {
208 int result = 0;
209
210 ACPI_FUNCTION_TRACE("acpi_ec_wait");
211
212 ec->intr.expect_event = event;
213 smp_mb();
214
215 switch (event) {
216 case ACPI_EC_EVENT_IBE:
217 if (~acpi_ec_read_status(ec) & event) {
218 ec->intr.expect_event = 0;
219 return_VALUE(0);
220 }
221 break;
222 default:
223 break;
224 }
225
226 result = wait_event_timeout(ec->intr.wait,
227 !ec->intr.expect_event,
228 msecs_to_jiffies(ACPI_EC_DELAY));
229
230 ec->intr.expect_event = 0;
231 smp_mb();
232
233 /*
234 * Verify that the event in question has actually happened by
235 * querying EC status. Do the check even if operation timed-out
236 * to make sure that we did not miss interrupt.
237 */
238 switch (event) {
239 case ACPI_EC_EVENT_OBF:
240 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
241 return_VALUE(0);
242 break;
243
244 case ACPI_EC_EVENT_IBE:
245 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
246 return_VALUE(0);
247 break;
248 }
249
250 return_VALUE(-ETIME);
251 }
252
253 #ifdef ACPI_FUTURE_USAGE
254 /*
255 * Note: samsung nv5000 doesn't work with ec burst mode.
256 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
257 */
258 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
259 {
260 u32 tmp = 0;
261 int status = 0;
262
263 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
264
265 status = acpi_ec_read_status(ec);
266 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
267 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
268 if (status)
269 goto end;
270 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
271 &ec->common.command_addr);
272 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
273 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
274 if (tmp != 0x90) { /* Burst ACK byte */
275 return_VALUE(-EINVAL);
276 }
277 }
278
279 atomic_set(&ec->intr.leaving_burst, 0);
280 return_VALUE(0);
281 end:
282 printk(KERN_WARNING PREFIX "Error in acpi_ec_wait\n");
283 return_VALUE(-1);
284 }
285
286 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
287 {
288 int status = 0;
289
290 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
291
292 status = acpi_ec_read_status(ec);
293 if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
294 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
295 if(status)
296 goto end;
297 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
298 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
299 }
300 atomic_set(&ec->intr.leaving_burst, 1);
301 return_VALUE(0);
302 end:
303 printk(KERN_WARNING PREFIX "leave burst_mode:error\n");
304 return_VALUE(-1);
305 }
306 #endif /* ACPI_FUTURE_USAGE */
307
308 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
309 {
310 if (acpi_ec_poll_mode)
311 return acpi_ec_poll_read(ec, address, data);
312 else
313 return acpi_ec_intr_read(ec, address, data);
314 }
315 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
316 {
317 if (acpi_ec_poll_mode)
318 return acpi_ec_poll_write(ec, address, data);
319 else
320 return acpi_ec_intr_write(ec, address, data);
321 }
322 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
323 {
324 acpi_status status = AE_OK;
325 int result = 0;
326 u32 glk = 0;
327
328 ACPI_FUNCTION_TRACE("acpi_ec_read");
329
330 if (!ec || !data)
331 return_VALUE(-EINVAL);
332
333 *data = 0;
334
335 if (ec->common.global_lock) {
336 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
337 if (ACPI_FAILURE(status))
338 return_VALUE(-ENODEV);
339 }
340
341 if (down_interruptible(&ec->poll.sem)) {
342 result = -ERESTARTSYS;
343 goto end_nosem;
344 }
345
346 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
347 &ec->common.command_addr);
348 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
349 if (result)
350 goto end;
351
352 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
353 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
354 if (result)
355 goto end;
356
357 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
358
359 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
360 *data, address));
361
362 end:
363 up(&ec->poll.sem);
364 end_nosem:
365 if (ec->common.global_lock)
366 acpi_release_global_lock(glk);
367
368 return_VALUE(result);
369 }
370
371 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
372 {
373 int result = 0;
374 acpi_status status = AE_OK;
375 u32 glk = 0;
376
377 ACPI_FUNCTION_TRACE("acpi_ec_write");
378
379 if (!ec)
380 return_VALUE(-EINVAL);
381
382 if (ec->common.global_lock) {
383 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
384 if (ACPI_FAILURE(status))
385 return_VALUE(-ENODEV);
386 }
387
388 if (down_interruptible(&ec->poll.sem)) {
389 result = -ERESTARTSYS;
390 goto end_nosem;
391 }
392
393 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
394 &ec->common.command_addr);
395 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
396 if (result)
397 goto end;
398
399 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
400 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
401 if (result)
402 goto end;
403
404 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
405 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
406 if (result)
407 goto end;
408
409 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
410 data, address));
411
412 end:
413 up(&ec->poll.sem);
414 end_nosem:
415 if (ec->common.global_lock)
416 acpi_release_global_lock(glk);
417
418 return_VALUE(result);
419 }
420
421 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
422 {
423 int status = 0;
424 u32 glk;
425
426 ACPI_FUNCTION_TRACE("acpi_ec_read");
427
428 if (!ec || !data)
429 return_VALUE(-EINVAL);
430
431 *data = 0;
432
433 if (ec->common.global_lock) {
434 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
435 if (ACPI_FAILURE(status))
436 return_VALUE(-ENODEV);
437 }
438
439 WARN_ON(in_interrupt());
440 down(&ec->intr.sem);
441
442 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
443 if (status) {
444 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
445 goto end;
446 }
447 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
448 &ec->common.command_addr);
449 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
450 if (status) {
451 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
452 }
453
454 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
455 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
456 if (status) {
457 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
458 goto end;
459 }
460 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
461 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
462 *data, address));
463
464 end:
465 up(&ec->intr.sem);
466
467 if (ec->common.global_lock)
468 acpi_release_global_lock(glk);
469
470 return_VALUE(status);
471 }
472
473 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
474 {
475 int status = 0;
476 u32 glk;
477
478 ACPI_FUNCTION_TRACE("acpi_ec_write");
479
480 if (!ec)
481 return_VALUE(-EINVAL);
482
483 if (ec->common.global_lock) {
484 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
485 if (ACPI_FAILURE(status))
486 return_VALUE(-ENODEV);
487 }
488
489 WARN_ON(in_interrupt());
490 down(&ec->intr.sem);
491
492 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
493 if (status) {
494 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
495 }
496 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
497 &ec->common.command_addr);
498 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
499 if (status) {
500 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
501 }
502
503 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
504 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
505 if (status) {
506 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
507 }
508
509 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
510
511 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
512 data, address));
513
514 up(&ec->intr.sem);
515
516 if (ec->common.global_lock)
517 acpi_release_global_lock(glk);
518
519 return_VALUE(status);
520 }
521
522 /*
523 * Externally callable EC access functions. For now, assume 1 EC only
524 */
525 int ec_read(u8 addr, u8 * val)
526 {
527 union acpi_ec *ec;
528 int err;
529 u32 temp_data;
530
531 if (!first_ec)
532 return -ENODEV;
533
534 ec = acpi_driver_data(first_ec);
535
536 err = acpi_ec_read(ec, addr, &temp_data);
537
538 if (!err) {
539 *val = temp_data;
540 return 0;
541 } else
542 return err;
543 }
544
545 EXPORT_SYMBOL(ec_read);
546
547 int ec_write(u8 addr, u8 val)
548 {
549 union acpi_ec *ec;
550 int err;
551
552 if (!first_ec)
553 return -ENODEV;
554
555 ec = acpi_driver_data(first_ec);
556
557 err = acpi_ec_write(ec, addr, val);
558
559 return err;
560 }
561
562 EXPORT_SYMBOL(ec_write);
563
564 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
565 {
566 if (acpi_ec_poll_mode)
567 return acpi_ec_poll_query(ec, data);
568 else
569 return acpi_ec_intr_query(ec, data);
570 }
571 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
572 {
573 int result = 0;
574 acpi_status status = AE_OK;
575 u32 glk = 0;
576
577 ACPI_FUNCTION_TRACE("acpi_ec_query");
578
579 if (!ec || !data)
580 return_VALUE(-EINVAL);
581
582 *data = 0;
583
584 if (ec->common.global_lock) {
585 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
586 if (ACPI_FAILURE(status))
587 return_VALUE(-ENODEV);
588 }
589
590 /*
591 * Query the EC to find out which _Qxx method we need to evaluate.
592 * Note that successful completion of the query causes the ACPI_EC_SCI
593 * bit to be cleared (and thus clearing the interrupt source).
594 */
595 if (down_interruptible(&ec->poll.sem)) {
596 result = -ERESTARTSYS;
597 goto end_nosem;
598 }
599
600 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
601 &ec->common.command_addr);
602 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
603 if (result)
604 goto end;
605
606 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
607 if (!*data)
608 result = -ENODATA;
609
610 end:
611 up(&ec->poll.sem);
612 end_nosem:
613 if (ec->common.global_lock)
614 acpi_release_global_lock(glk);
615
616 return_VALUE(result);
617 }
618 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
619 {
620 int status = 0;
621 u32 glk;
622
623 ACPI_FUNCTION_TRACE("acpi_ec_query");
624
625 if (!ec || !data)
626 return_VALUE(-EINVAL);
627 *data = 0;
628
629 if (ec->common.global_lock) {
630 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
631 if (ACPI_FAILURE(status))
632 return_VALUE(-ENODEV);
633 }
634
635 down(&ec->intr.sem);
636
637 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
638 if (status) {
639 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
640 goto end;
641 }
642 /*
643 * Query the EC to find out which _Qxx method we need to evaluate.
644 * Note that successful completion of the query causes the ACPI_EC_SCI
645 * bit to be cleared (and thus clearing the interrupt source).
646 */
647 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
648 &ec->common.command_addr);
649 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
650 if (status) {
651 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
652 goto end;
653 }
654
655 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
656 if (!*data)
657 status = -ENODATA;
658
659 end:
660 up(&ec->intr.sem);
661
662 if (ec->common.global_lock)
663 acpi_release_global_lock(glk);
664
665 return_VALUE(status);
666 }
667
668 /* --------------------------------------------------------------------------
669 Event Management
670 -------------------------------------------------------------------------- */
671
672 union acpi_ec_query_data {
673 acpi_handle handle;
674 u8 data;
675 };
676
677 static void acpi_ec_gpe_query(void *ec_cxt)
678 {
679 if (acpi_ec_poll_mode)
680 acpi_ec_gpe_poll_query(ec_cxt);
681 else
682 acpi_ec_gpe_intr_query(ec_cxt);
683 }
684
685 static void acpi_ec_gpe_poll_query(void *ec_cxt)
686 {
687 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
688 u32 value = 0;
689 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
690 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
691 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
692 };
693
694 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
695
696 if (!ec_cxt)
697 goto end;
698
699 if (down_interruptible (&ec->poll.sem)) {
700 return_VOID;
701 }
702 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
703 up(&ec->poll.sem);
704
705 /* TBD: Implement asynch events!
706 * NOTE: All we care about are EC-SCI's. Other EC events are
707 * handled via polling (yuck!). This is because some systems
708 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
709 * a purely interrupt-driven approach (grumble, grumble).
710 */
711 if (!(value & ACPI_EC_FLAG_SCI))
712 goto end;
713
714 if (acpi_ec_query(ec, &value))
715 goto end;
716
717 object_name[2] = hex[((value >> 4) & 0x0F)];
718 object_name[3] = hex[(value & 0x0F)];
719
720 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
721
722 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
723
724 end:
725 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
726 }
727 static void acpi_ec_gpe_intr_query(void *ec_cxt)
728 {
729 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
730 u32 value;
731 int result = -ENODATA;
732 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
733 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
734 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
735 };
736
737 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
738
739 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
740 result = acpi_ec_query(ec, &value);
741
742 if (result)
743 goto end;
744
745 object_name[2] = hex[((value >> 4) & 0x0F)];
746 object_name[3] = hex[(value & 0x0F)];
747
748 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
749
750 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
751 end:
752 atomic_dec(&ec->intr.pending_gpe);
753 return;
754 }
755
756 static u32 acpi_ec_gpe_handler(void *data)
757 {
758 if (acpi_ec_poll_mode)
759 return acpi_ec_gpe_poll_handler(data);
760 else
761 return acpi_ec_gpe_intr_handler(data);
762 }
763 static u32 acpi_ec_gpe_poll_handler(void *data)
764 {
765 acpi_status status = AE_OK;
766 union acpi_ec *ec = (union acpi_ec *)data;
767
768 if (!ec)
769 return ACPI_INTERRUPT_NOT_HANDLED;
770
771 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
772
773 status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
774
775 if (status == AE_OK)
776 return ACPI_INTERRUPT_HANDLED;
777 else
778 return ACPI_INTERRUPT_NOT_HANDLED;
779 }
780 static u32 acpi_ec_gpe_intr_handler(void *data)
781 {
782 acpi_status status = AE_OK;
783 u32 value;
784 union acpi_ec *ec = (union acpi_ec *)data;
785
786 if (!ec)
787 return ACPI_INTERRUPT_NOT_HANDLED;
788
789 acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
790 value = acpi_ec_read_status(ec);
791
792 switch (ec->intr.expect_event) {
793 case ACPI_EC_EVENT_OBF:
794 if (!(value & ACPI_EC_FLAG_OBF))
795 break;
796 case ACPI_EC_EVENT_IBE:
797 if ((value & ACPI_EC_FLAG_IBF))
798 break;
799 ec->intr.expect_event = 0;
800 wake_up(&ec->intr.wait);
801 return ACPI_INTERRUPT_HANDLED;
802 default:
803 break;
804 }
805
806 if (value & ACPI_EC_FLAG_SCI) {
807 atomic_add(1, &ec->intr.pending_gpe);
808 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
809 acpi_ec_gpe_query, ec);
810 return status == AE_OK ?
811 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
812 }
813 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
814 return status == AE_OK ?
815 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
816 }
817
818 /* --------------------------------------------------------------------------
819 Address Space Management
820 -------------------------------------------------------------------------- */
821
822 static acpi_status
823 acpi_ec_space_setup(acpi_handle region_handle,
824 u32 function, void *handler_context, void **return_context)
825 {
826 /*
827 * The EC object is in the handler context and is needed
828 * when calling the acpi_ec_space_handler.
829 */
830 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
831 handler_context : NULL;
832
833 return AE_OK;
834 }
835
836 static acpi_status
837 acpi_ec_space_handler(u32 function,
838 acpi_physical_address address,
839 u32 bit_width,
840 acpi_integer * value,
841 void *handler_context, void *region_context)
842 {
843 int result = 0;
844 union acpi_ec *ec = NULL;
845 u64 temp = *value;
846 acpi_integer f_v = 0;
847 int i = 0;
848
849 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
850
851 if ((address > 0xFF) || !value || !handler_context)
852 return_VALUE(AE_BAD_PARAMETER);
853
854 if (bit_width != 8 && acpi_strict) {
855 printk(KERN_WARNING PREFIX
856 "acpi_ec_space_handler: bit_width should be 8\n");
857 return_VALUE(AE_BAD_PARAMETER);
858 }
859
860 ec = (union acpi_ec *)handler_context;
861
862 next_byte:
863 switch (function) {
864 case ACPI_READ:
865 temp = 0;
866 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
867 break;
868 case ACPI_WRITE:
869 result = acpi_ec_write(ec, (u8) address, (u8) temp);
870 break;
871 default:
872 result = -EINVAL;
873 goto out;
874 break;
875 }
876
877 bit_width -= 8;
878 if (bit_width) {
879 if (function == ACPI_READ)
880 f_v |= temp << 8 * i;
881 if (function == ACPI_WRITE)
882 temp >>= 8;
883 i++;
884 address++;
885 goto next_byte;
886 }
887
888 if (function == ACPI_READ) {
889 f_v |= temp << 8 * i;
890 *value = f_v;
891 }
892
893 out:
894 switch (result) {
895 case -EINVAL:
896 return_VALUE(AE_BAD_PARAMETER);
897 break;
898 case -ENODEV:
899 return_VALUE(AE_NOT_FOUND);
900 break;
901 case -ETIME:
902 return_VALUE(AE_TIME);
903 break;
904 default:
905 return_VALUE(AE_OK);
906 }
907 }
908
909 /* --------------------------------------------------------------------------
910 FS Interface (/proc)
911 -------------------------------------------------------------------------- */
912
913 static struct proc_dir_entry *acpi_ec_dir;
914
915 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
916 {
917 union acpi_ec *ec = (union acpi_ec *)seq->private;
918
919 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
920
921 if (!ec)
922 goto end;
923
924 seq_printf(seq, "gpe bit: 0x%02x\n",
925 (u32) ec->common.gpe_bit);
926 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
927 (u32) ec->common.status_addr.address,
928 (u32) ec->common.data_addr.address);
929 seq_printf(seq, "use global lock: %s\n",
930 ec->common.global_lock ? "yes" : "no");
931 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
932
933 end:
934 return_VALUE(0);
935 }
936
937 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
938 {
939 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
940 }
941
942 static struct file_operations acpi_ec_info_ops = {
943 .open = acpi_ec_info_open_fs,
944 .read = seq_read,
945 .llseek = seq_lseek,
946 .release = single_release,
947 .owner = THIS_MODULE,
948 };
949
950 static int acpi_ec_add_fs(struct acpi_device *device)
951 {
952 struct proc_dir_entry *entry = NULL;
953
954 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
955
956 if (!acpi_device_dir(device)) {
957 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
958 acpi_ec_dir);
959 if (!acpi_device_dir(device))
960 return_VALUE(-ENODEV);
961 }
962
963 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
964 acpi_device_dir(device));
965 if (!entry)
966 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
967 "Unable to create '%s' fs entry\n",
968 ACPI_EC_FILE_INFO));
969 else {
970 entry->proc_fops = &acpi_ec_info_ops;
971 entry->data = acpi_driver_data(device);
972 entry->owner = THIS_MODULE;
973 }
974
975 return_VALUE(0);
976 }
977
978 static int acpi_ec_remove_fs(struct acpi_device *device)
979 {
980 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
981
982 if (acpi_device_dir(device)) {
983 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
984 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
985 acpi_device_dir(device) = NULL;
986 }
987
988 return_VALUE(0);
989 }
990
991 /* --------------------------------------------------------------------------
992 Driver Interface
993 -------------------------------------------------------------------------- */
994
995 static int acpi_ec_poll_add(struct acpi_device *device)
996 {
997 int result = 0;
998 acpi_status status = AE_OK;
999 union acpi_ec *ec = NULL;
1000
1001 ACPI_FUNCTION_TRACE("acpi_ec_add");
1002
1003 if (!device)
1004 return_VALUE(-EINVAL);
1005
1006 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1007 if (!ec)
1008 return_VALUE(-ENOMEM);
1009 memset(ec, 0, sizeof(union acpi_ec));
1010
1011 ec->common.handle = device->handle;
1012 ec->common.uid = -1;
1013 init_MUTEX(&ec->poll.sem);
1014 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1015 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1016 acpi_driver_data(device) = ec;
1017
1018 /* Use the global lock for all EC transactions? */
1019 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1020 &ec->common.global_lock);
1021
1022 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1023 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1024 if (ec_ecdt) {
1025 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1026 ACPI_ADR_SPACE_EC,
1027 &acpi_ec_space_handler);
1028
1029 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1030 &acpi_ec_gpe_handler);
1031
1032 kfree(ec_ecdt);
1033 }
1034
1035 /* Get GPE bit assignment (EC events). */
1036 /* TODO: Add support for _GPE returning a package */
1037 status =
1038 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1039 &ec->common.gpe_bit);
1040 if (ACPI_FAILURE(status)) {
1041 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1042 "Error obtaining GPE bit assignment\n"));
1043 result = -ENODEV;
1044 goto end;
1045 }
1046
1047 result = acpi_ec_add_fs(device);
1048 if (result)
1049 goto end;
1050
1051 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1052 acpi_device_name(device), acpi_device_bid(device),
1053 (u32) ec->common.gpe_bit);
1054
1055 if (!first_ec)
1056 first_ec = device;
1057
1058 end:
1059 if (result)
1060 kfree(ec);
1061
1062 return_VALUE(result);
1063 }
1064 static int acpi_ec_intr_add(struct acpi_device *device)
1065 {
1066 int result = 0;
1067 acpi_status status = AE_OK;
1068 union acpi_ec *ec = NULL;
1069
1070 ACPI_FUNCTION_TRACE("acpi_ec_add");
1071
1072 if (!device)
1073 return_VALUE(-EINVAL);
1074
1075 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1076 if (!ec)
1077 return_VALUE(-ENOMEM);
1078 memset(ec, 0, sizeof(union acpi_ec));
1079
1080 ec->common.handle = device->handle;
1081 ec->common.uid = -1;
1082 atomic_set(&ec->intr.pending_gpe, 0);
1083 atomic_set(&ec->intr.leaving_burst, 1);
1084 init_MUTEX(&ec->intr.sem);
1085 init_waitqueue_head(&ec->intr.wait);
1086 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1087 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1088 acpi_driver_data(device) = ec;
1089
1090 /* Use the global lock for all EC transactions? */
1091 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1092 &ec->common.global_lock);
1093
1094 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1095 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1096 if (ec_ecdt) {
1097 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1098 ACPI_ADR_SPACE_EC,
1099 &acpi_ec_space_handler);
1100
1101 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1102 &acpi_ec_gpe_handler);
1103
1104 kfree(ec_ecdt);
1105 }
1106
1107 /* Get GPE bit assignment (EC events). */
1108 /* TODO: Add support for _GPE returning a package */
1109 status =
1110 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1111 &ec->common.gpe_bit);
1112 if (ACPI_FAILURE(status)) {
1113 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1114 "Error obtaining GPE bit assignment\n"));
1115 result = -ENODEV;
1116 goto end;
1117 }
1118
1119 result = acpi_ec_add_fs(device);
1120 if (result)
1121 goto end;
1122
1123 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1124 acpi_device_name(device), acpi_device_bid(device),
1125 (u32) ec->common.gpe_bit);
1126
1127 if (!first_ec)
1128 first_ec = device;
1129
1130 end:
1131 if (result)
1132 kfree(ec);
1133
1134 return_VALUE(result);
1135 }
1136
1137 static int acpi_ec_remove(struct acpi_device *device, int type)
1138 {
1139 union acpi_ec *ec = NULL;
1140
1141 ACPI_FUNCTION_TRACE("acpi_ec_remove");
1142
1143 if (!device)
1144 return_VALUE(-EINVAL);
1145
1146 ec = acpi_driver_data(device);
1147
1148 acpi_ec_remove_fs(device);
1149
1150 kfree(ec);
1151
1152 return_VALUE(0);
1153 }
1154
1155 static acpi_status
1156 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1157 {
1158 union acpi_ec *ec = (union acpi_ec *)context;
1159 struct acpi_generic_address *addr;
1160
1161 if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1162 return AE_OK;
1163 }
1164
1165 /*
1166 * The first address region returned is the data port, and
1167 * the second address region returned is the status/command
1168 * port.
1169 */
1170 if (ec->common.data_addr.register_bit_width == 0) {
1171 addr = &ec->common.data_addr;
1172 } else if (ec->common.command_addr.register_bit_width == 0) {
1173 addr = &ec->common.command_addr;
1174 } else {
1175 return AE_CTRL_TERMINATE;
1176 }
1177
1178 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1179 addr->register_bit_width = 8;
1180 addr->register_bit_offset = 0;
1181 addr->address = resource->data.io.minimum;
1182
1183 return AE_OK;
1184 }
1185
1186 static int acpi_ec_start(struct acpi_device *device)
1187 {
1188 acpi_status status = AE_OK;
1189 union acpi_ec *ec = NULL;
1190
1191 ACPI_FUNCTION_TRACE("acpi_ec_start");
1192
1193 if (!device)
1194 return_VALUE(-EINVAL);
1195
1196 ec = acpi_driver_data(device);
1197
1198 if (!ec)
1199 return_VALUE(-EINVAL);
1200
1201 /*
1202 * Get I/O port addresses. Convert to GAS format.
1203 */
1204 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1205 acpi_ec_io_ports, ec);
1206 if (ACPI_FAILURE(status)
1207 || ec->common.command_addr.register_bit_width == 0) {
1208 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1209 "Error getting I/O port addresses"));
1210 return_VALUE(-ENODEV);
1211 }
1212
1213 ec->common.status_addr = ec->common.command_addr;
1214
1215 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1216 (u32) ec->common.gpe_bit,
1217 (u32) ec->common.command_addr.address,
1218 (u32) ec->common.data_addr.address));
1219
1220 /*
1221 * Install GPE handler
1222 */
1223 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1224 ACPI_GPE_EDGE_TRIGGERED,
1225 &acpi_ec_gpe_handler, ec);
1226 if (ACPI_FAILURE(status)) {
1227 return_VALUE(-ENODEV);
1228 }
1229 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1230 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1231
1232 status = acpi_install_address_space_handler(ec->common.handle,
1233 ACPI_ADR_SPACE_EC,
1234 &acpi_ec_space_handler,
1235 &acpi_ec_space_setup, ec);
1236 if (ACPI_FAILURE(status)) {
1237 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1238 &acpi_ec_gpe_handler);
1239 return_VALUE(-ENODEV);
1240 }
1241
1242 return_VALUE(AE_OK);
1243 }
1244
1245 static int acpi_ec_stop(struct acpi_device *device, int type)
1246 {
1247 acpi_status status = AE_OK;
1248 union acpi_ec *ec = NULL;
1249
1250 ACPI_FUNCTION_TRACE("acpi_ec_stop");
1251
1252 if (!device)
1253 return_VALUE(-EINVAL);
1254
1255 ec = acpi_driver_data(device);
1256
1257 status = acpi_remove_address_space_handler(ec->common.handle,
1258 ACPI_ADR_SPACE_EC,
1259 &acpi_ec_space_handler);
1260 if (ACPI_FAILURE(status))
1261 return_VALUE(-ENODEV);
1262
1263 status =
1264 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1265 &acpi_ec_gpe_handler);
1266 if (ACPI_FAILURE(status))
1267 return_VALUE(-ENODEV);
1268
1269 return_VALUE(0);
1270 }
1271
1272 static acpi_status __init
1273 acpi_fake_ecdt_callback(acpi_handle handle,
1274 u32 Level, void *context, void **retval)
1275 {
1276
1277 if (acpi_ec_poll_mode)
1278 return acpi_fake_ecdt_poll_callback(handle,
1279 Level, context, retval);
1280 else
1281 return acpi_fake_ecdt_intr_callback(handle,
1282 Level, context, retval);
1283 }
1284
1285 static acpi_status __init
1286 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1287 u32 Level, void *context, void **retval)
1288 {
1289 acpi_status status;
1290
1291 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1292 acpi_ec_io_ports, ec_ecdt);
1293 if (ACPI_FAILURE(status))
1294 return status;
1295 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1296
1297 ec_ecdt->common.uid = -1;
1298 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1299
1300 status =
1301 acpi_evaluate_integer(handle, "_GPE", NULL,
1302 &ec_ecdt->common.gpe_bit);
1303 if (ACPI_FAILURE(status))
1304 return status;
1305 init_MUTEX(&ec_ecdt->poll.sem);
1306 ec_ecdt->common.global_lock = TRUE;
1307 ec_ecdt->common.handle = handle;
1308
1309 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1310 (u32) ec_ecdt->common.gpe_bit,
1311 (u32) ec_ecdt->common.command_addr.address,
1312 (u32) ec_ecdt->common.data_addr.address);
1313
1314 return AE_CTRL_TERMINATE;
1315 }
1316
1317 static acpi_status __init
1318 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1319 u32 Level, void *context, void **retval)
1320 {
1321 acpi_status status;
1322
1323 init_MUTEX(&ec_ecdt->intr.sem);
1324 init_waitqueue_head(&ec_ecdt->intr.wait);
1325 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1326 acpi_ec_io_ports, ec_ecdt);
1327 if (ACPI_FAILURE(status))
1328 return status;
1329 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1330
1331 ec_ecdt->common.uid = -1;
1332 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1333
1334 status =
1335 acpi_evaluate_integer(handle, "_GPE", NULL,
1336 &ec_ecdt->common.gpe_bit);
1337 if (ACPI_FAILURE(status))
1338 return status;
1339 ec_ecdt->common.global_lock = TRUE;
1340 ec_ecdt->common.handle = handle;
1341
1342 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1343 (u32) ec_ecdt->common.gpe_bit,
1344 (u32) ec_ecdt->common.command_addr.address,
1345 (u32) ec_ecdt->common.data_addr.address);
1346
1347 return AE_CTRL_TERMINATE;
1348 }
1349
1350 /*
1351 * Some BIOS (such as some from Gateway laptops) access EC region very early
1352 * such as in BAT0._INI or EC._INI before an EC device is found and
1353 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1354 * required, but if EC regison is accessed early, it is required.
1355 * The routine tries to workaround the BIOS bug by pre-scan EC device
1356 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1357 * op region (since _REG isn't invoked yet). The assumption is true for
1358 * all systems found.
1359 */
1360 static int __init acpi_ec_fake_ecdt(void)
1361 {
1362 acpi_status status;
1363 int ret = 0;
1364
1365 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1366
1367 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1368 if (!ec_ecdt) {
1369 ret = -ENOMEM;
1370 goto error;
1371 }
1372 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1373
1374 status = acpi_get_devices(ACPI_EC_HID,
1375 acpi_fake_ecdt_callback, NULL, NULL);
1376 if (ACPI_FAILURE(status)) {
1377 kfree(ec_ecdt);
1378 ec_ecdt = NULL;
1379 ret = -ENODEV;
1380 goto error;
1381 }
1382 return 0;
1383 error:
1384 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1385 return ret;
1386 }
1387
1388 static int __init acpi_ec_get_real_ecdt(void)
1389 {
1390 if (acpi_ec_poll_mode)
1391 return acpi_ec_poll_get_real_ecdt();
1392 else
1393 return acpi_ec_intr_get_real_ecdt();
1394 }
1395
1396 static int __init acpi_ec_poll_get_real_ecdt(void)
1397 {
1398 acpi_status status;
1399 struct acpi_table_ecdt *ecdt_ptr;
1400
1401 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1402 (struct acpi_table_header **)
1403 &ecdt_ptr);
1404 if (ACPI_FAILURE(status))
1405 return -ENODEV;
1406
1407 printk(KERN_INFO PREFIX "Found ECDT\n");
1408
1409 /*
1410 * Generate a temporary ec context to use until the namespace is scanned
1411 */
1412 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1413 if (!ec_ecdt)
1414 return -ENOMEM;
1415 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1416
1417 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1418 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1419 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1420 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1421 init_MUTEX(&ec_ecdt->poll.sem);
1422 /* use the GL just to be safe */
1423 ec_ecdt->common.global_lock = TRUE;
1424 ec_ecdt->common.uid = ecdt_ptr->uid;
1425
1426 status =
1427 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1428 if (ACPI_FAILURE(status)) {
1429 goto error;
1430 }
1431
1432 return 0;
1433 error:
1434 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1435 kfree(ec_ecdt);
1436 ec_ecdt = NULL;
1437
1438 return -ENODEV;
1439 }
1440
1441 static int __init acpi_ec_intr_get_real_ecdt(void)
1442 {
1443 acpi_status status;
1444 struct acpi_table_ecdt *ecdt_ptr;
1445
1446 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1447 (struct acpi_table_header **)
1448 &ecdt_ptr);
1449 if (ACPI_FAILURE(status))
1450 return -ENODEV;
1451
1452 printk(KERN_INFO PREFIX "Found ECDT\n");
1453
1454 /*
1455 * Generate a temporary ec context to use until the namespace is scanned
1456 */
1457 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1458 if (!ec_ecdt)
1459 return -ENOMEM;
1460 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1461
1462 init_MUTEX(&ec_ecdt->intr.sem);
1463 init_waitqueue_head(&ec_ecdt->intr.wait);
1464 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1465 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1466 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1467 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
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 __initdata acpi_fake_ecdt_enabled;
1488 int __init acpi_ec_ecdt_probe(void)
1489 {
1490 acpi_status status;
1491 int ret;
1492
1493 ret = acpi_ec_get_real_ecdt();
1494 /* Try to make a fake ECDT */
1495 if (ret && acpi_fake_ecdt_enabled) {
1496 ret = acpi_ec_fake_ecdt();
1497 }
1498
1499 if (ret)
1500 return 0;
1501
1502 /*
1503 * Install GPE handler
1504 */
1505 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1506 ACPI_GPE_EDGE_TRIGGERED,
1507 &acpi_ec_gpe_handler, ec_ecdt);
1508 if (ACPI_FAILURE(status)) {
1509 goto error;
1510 }
1511 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1512 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1513
1514 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1515 ACPI_ADR_SPACE_EC,
1516 &acpi_ec_space_handler,
1517 &acpi_ec_space_setup,
1518 ec_ecdt);
1519 if (ACPI_FAILURE(status)) {
1520 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1521 &acpi_ec_gpe_handler);
1522 goto error;
1523 }
1524
1525 return 0;
1526
1527 error:
1528 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1529 kfree(ec_ecdt);
1530 ec_ecdt = NULL;
1531
1532 return -ENODEV;
1533 }
1534
1535 static int __init acpi_ec_init(void)
1536 {
1537 int result = 0;
1538
1539 ACPI_FUNCTION_TRACE("acpi_ec_init");
1540
1541 if (acpi_disabled)
1542 return_VALUE(0);
1543
1544 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1545 if (!acpi_ec_dir)
1546 return_VALUE(-ENODEV);
1547
1548 /* Now register the driver for the EC */
1549 result = acpi_bus_register_driver(&acpi_ec_driver);
1550 if (result < 0) {
1551 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1552 return_VALUE(-ENODEV);
1553 }
1554
1555 return_VALUE(result);
1556 }
1557
1558 subsys_initcall(acpi_ec_init);
1559
1560 /* EC driver currently not unloadable */
1561 #if 0
1562 static void __exit acpi_ec_exit(void)
1563 {
1564 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1565
1566 acpi_bus_unregister_driver(&acpi_ec_driver);
1567
1568 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1569
1570 return_VOID;
1571 }
1572 #endif /* 0 */
1573
1574 static int __init acpi_fake_ecdt_setup(char *str)
1575 {
1576 acpi_fake_ecdt_enabled = 1;
1577 return 1;
1578 }
1579
1580 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1581 static int __init acpi_ec_set_intr_mode(char *str)
1582 {
1583 int intr;
1584
1585 if (!get_option(&str, &intr))
1586 return 0;
1587
1588 if (intr) {
1589 acpi_ec_poll_mode = EC_INTR;
1590 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1591 } else {
1592 acpi_ec_poll_mode = EC_POLL;
1593 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1594 }
1595 printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1596 return 1;
1597 }
1598
1599 __setup("ec_intr=", acpi_ec_set_intr_mode);
kernel source for telekom puls (alcatel/mediatek)