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ACPI: delete tracing macros from drivers/acpi/*.c
[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_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
211 ec->intr.expect_event = event;
212 smp_mb();
213
214 switch (event) {
215 case ACPI_EC_EVENT_IBE:
216 if (~acpi_ec_read_status(ec) & event) {
217 ec->intr.expect_event = 0;
218 return 0;
219 }
220 break;
221 default:
222 break;
223 }
224
225 result = wait_event_timeout(ec->intr.wait,
226 !ec->intr.expect_event,
227 msecs_to_jiffies(ACPI_EC_DELAY));
228
229 ec->intr.expect_event = 0;
230 smp_mb();
231
232 /*
233 * Verify that the event in question has actually happened by
234 * querying EC status. Do the check even if operation timed-out
235 * to make sure that we did not miss interrupt.
236 */
237 switch (event) {
238 case ACPI_EC_EVENT_OBF:
239 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
240 return 0;
241 break;
242
243 case ACPI_EC_EVENT_IBE:
244 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
245 return 0;
246 break;
247 }
248
249 return -ETIME;
250 }
251
252 #ifdef ACPI_FUTURE_USAGE
253 /*
254 * Note: samsung nv5000 doesn't work with ec burst mode.
255 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
256 */
257 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
258 {
259 u32 tmp = 0;
260 int status = 0;
261
262
263 status = acpi_ec_read_status(ec);
264 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
265 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
266 if (status)
267 goto end;
268 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
269 &ec->common.command_addr);
270 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
271 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
272 if (tmp != 0x90) { /* Burst ACK byte */
273 return -EINVAL;
274 }
275 }
276
277 atomic_set(&ec->intr.leaving_burst, 0);
278 return 0;
279 end:
280 ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode");
281 return -1;
282 }
283
284 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
285 {
286 int status = 0;
287
288
289 status = acpi_ec_read_status(ec);
290 if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
291 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
292 if(status)
293 goto end;
294 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
295 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
296 }
297 atomic_set(&ec->intr.leaving_burst, 1);
298 return 0;
299 end:
300 ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode");
301 return -1;
302 }
303 #endif /* ACPI_FUTURE_USAGE */
304
305 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
306 {
307 if (acpi_ec_poll_mode)
308 return acpi_ec_poll_read(ec, address, data);
309 else
310 return acpi_ec_intr_read(ec, address, data);
311 }
312 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
313 {
314 if (acpi_ec_poll_mode)
315 return acpi_ec_poll_write(ec, address, data);
316 else
317 return acpi_ec_intr_write(ec, address, data);
318 }
319 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
320 {
321 acpi_status status = AE_OK;
322 int result = 0;
323 u32 glk = 0;
324
325
326 if (!ec || !data)
327 return -EINVAL;
328
329 *data = 0;
330
331 if (ec->common.global_lock) {
332 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
333 if (ACPI_FAILURE(status))
334 return -ENODEV;
335 }
336
337 if (down_interruptible(&ec->poll.sem)) {
338 result = -ERESTARTSYS;
339 goto end_nosem;
340 }
341
342 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
343 &ec->common.command_addr);
344 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
345 if (result)
346 goto end;
347
348 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
349 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
350 if (result)
351 goto end;
352
353 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
354
355 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
356 *data, address));
357
358 end:
359 up(&ec->poll.sem);
360 end_nosem:
361 if (ec->common.global_lock)
362 acpi_release_global_lock(glk);
363
364 return result;
365 }
366
367 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
368 {
369 int result = 0;
370 acpi_status status = AE_OK;
371 u32 glk = 0;
372
373
374 if (!ec)
375 return -EINVAL;
376
377 if (ec->common.global_lock) {
378 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
379 if (ACPI_FAILURE(status))
380 return -ENODEV;
381 }
382
383 if (down_interruptible(&ec->poll.sem)) {
384 result = -ERESTARTSYS;
385 goto end_nosem;
386 }
387
388 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
389 &ec->common.command_addr);
390 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
391 if (result)
392 goto end;
393
394 acpi_hw_low_level_write(8, address, &ec->common.data_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, data, &ec->common.data_addr);
400 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
401 if (result)
402 goto end;
403
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
405 data, address));
406
407 end:
408 up(&ec->poll.sem);
409 end_nosem:
410 if (ec->common.global_lock)
411 acpi_release_global_lock(glk);
412
413 return result;
414 }
415
416 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
417 {
418 int status = 0;
419 u32 glk;
420
421
422 if (!ec || !data)
423 return -EINVAL;
424
425 *data = 0;
426
427 if (ec->common.global_lock) {
428 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
429 if (ACPI_FAILURE(status))
430 return -ENODEV;
431 }
432
433 WARN_ON(in_interrupt());
434 down(&ec->intr.sem);
435
436 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
437 if (status) {
438 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
439 goto end;
440 }
441 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
442 &ec->common.command_addr);
443 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
444 if (status) {
445 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
446 }
447
448 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
449 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
450 if (status) {
451 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
452 goto end;
453 }
454 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
455 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
456 *data, address));
457
458 end:
459 up(&ec->intr.sem);
460
461 if (ec->common.global_lock)
462 acpi_release_global_lock(glk);
463
464 return status;
465 }
466
467 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
468 {
469 int status = 0;
470 u32 glk;
471
472
473 if (!ec)
474 return -EINVAL;
475
476 if (ec->common.global_lock) {
477 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
478 if (ACPI_FAILURE(status))
479 return -ENODEV;
480 }
481
482 WARN_ON(in_interrupt());
483 down(&ec->intr.sem);
484
485 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
486 if (status) {
487 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
488 }
489 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
490 &ec->common.command_addr);
491 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
492 if (status) {
493 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
494 }
495
496 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
497 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
498 if (status) {
499 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
500 }
501
502 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
503
504 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
505 data, address));
506
507 up(&ec->intr.sem);
508
509 if (ec->common.global_lock)
510 acpi_release_global_lock(glk);
511
512 return status;
513 }
514
515 /*
516 * Externally callable EC access functions. For now, assume 1 EC only
517 */
518 int ec_read(u8 addr, u8 * val)
519 {
520 union acpi_ec *ec;
521 int err;
522 u32 temp_data;
523
524 if (!first_ec)
525 return -ENODEV;
526
527 ec = acpi_driver_data(first_ec);
528
529 err = acpi_ec_read(ec, addr, &temp_data);
530
531 if (!err) {
532 *val = temp_data;
533 return 0;
534 } else
535 return err;
536 }
537
538 EXPORT_SYMBOL(ec_read);
539
540 int ec_write(u8 addr, u8 val)
541 {
542 union acpi_ec *ec;
543 int err;
544
545 if (!first_ec)
546 return -ENODEV;
547
548 ec = acpi_driver_data(first_ec);
549
550 err = acpi_ec_write(ec, addr, val);
551
552 return err;
553 }
554
555 EXPORT_SYMBOL(ec_write);
556
557 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
558 {
559 if (acpi_ec_poll_mode)
560 return acpi_ec_poll_query(ec, data);
561 else
562 return acpi_ec_intr_query(ec, data);
563 }
564 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
565 {
566 int result = 0;
567 acpi_status status = AE_OK;
568 u32 glk = 0;
569
570
571 if (!ec || !data)
572 return -EINVAL;
573
574 *data = 0;
575
576 if (ec->common.global_lock) {
577 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
578 if (ACPI_FAILURE(status))
579 return -ENODEV;
580 }
581
582 /*
583 * Query the EC to find out which _Qxx method we need to evaluate.
584 * Note that successful completion of the query causes the ACPI_EC_SCI
585 * bit to be cleared (and thus clearing the interrupt source).
586 */
587 if (down_interruptible(&ec->poll.sem)) {
588 result = -ERESTARTSYS;
589 goto end_nosem;
590 }
591
592 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
593 &ec->common.command_addr);
594 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
595 if (result)
596 goto end;
597
598 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
599 if (!*data)
600 result = -ENODATA;
601
602 end:
603 up(&ec->poll.sem);
604 end_nosem:
605 if (ec->common.global_lock)
606 acpi_release_global_lock(glk);
607
608 return result;
609 }
610 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
611 {
612 int status = 0;
613 u32 glk;
614
615
616 if (!ec || !data)
617 return -EINVAL;
618 *data = 0;
619
620 if (ec->common.global_lock) {
621 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
622 if (ACPI_FAILURE(status))
623 return -ENODEV;
624 }
625
626 down(&ec->intr.sem);
627
628 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
629 if (status) {
630 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
631 goto end;
632 }
633 /*
634 * Query the EC to find out which _Qxx method we need to evaluate.
635 * Note that successful completion of the query causes the ACPI_EC_SCI
636 * bit to be cleared (and thus clearing the interrupt source).
637 */
638 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
639 &ec->common.command_addr);
640 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
641 if (status) {
642 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
643 goto end;
644 }
645
646 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
647 if (!*data)
648 status = -ENODATA;
649
650 end:
651 up(&ec->intr.sem);
652
653 if (ec->common.global_lock)
654 acpi_release_global_lock(glk);
655
656 return status;
657 }
658
659 /* --------------------------------------------------------------------------
660 Event Management
661 -------------------------------------------------------------------------- */
662
663 union acpi_ec_query_data {
664 acpi_handle handle;
665 u8 data;
666 };
667
668 static void acpi_ec_gpe_query(void *ec_cxt)
669 {
670 if (acpi_ec_poll_mode)
671 acpi_ec_gpe_poll_query(ec_cxt);
672 else
673 acpi_ec_gpe_intr_query(ec_cxt);
674 }
675
676 static void acpi_ec_gpe_poll_query(void *ec_cxt)
677 {
678 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
679 u32 value = 0;
680 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
681 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
682 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
683 };
684
685
686 if (!ec_cxt)
687 goto end;
688
689 if (down_interruptible (&ec->poll.sem)) {
690 return;
691 }
692 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
693 up(&ec->poll.sem);
694
695 /* TBD: Implement asynch events!
696 * NOTE: All we care about are EC-SCI's. Other EC events are
697 * handled via polling (yuck!). This is because some systems
698 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
699 * a purely interrupt-driven approach (grumble, grumble).
700 */
701 if (!(value & ACPI_EC_FLAG_SCI))
702 goto end;
703
704 if (acpi_ec_query(ec, &value))
705 goto end;
706
707 object_name[2] = hex[((value >> 4) & 0x0F)];
708 object_name[3] = hex[(value & 0x0F)];
709
710 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
711
712 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
713
714 end:
715 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
716 }
717 static void acpi_ec_gpe_intr_query(void *ec_cxt)
718 {
719 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
720 u32 value;
721 int result = -ENODATA;
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
728 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
729 result = acpi_ec_query(ec, &value);
730
731 if (result)
732 goto end;
733
734 object_name[2] = hex[((value >> 4) & 0x0F)];
735 object_name[3] = hex[(value & 0x0F)];
736
737 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
738
739 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
740 end:
741 atomic_dec(&ec->intr.pending_gpe);
742 return;
743 }
744
745 static u32 acpi_ec_gpe_handler(void *data)
746 {
747 if (acpi_ec_poll_mode)
748 return acpi_ec_gpe_poll_handler(data);
749 else
750 return acpi_ec_gpe_intr_handler(data);
751 }
752 static u32 acpi_ec_gpe_poll_handler(void *data)
753 {
754 acpi_status status = AE_OK;
755 union acpi_ec *ec = (union acpi_ec *)data;
756
757 if (!ec)
758 return ACPI_INTERRUPT_NOT_HANDLED;
759
760 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
761
762 status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
763
764 if (status == AE_OK)
765 return ACPI_INTERRUPT_HANDLED;
766 else
767 return ACPI_INTERRUPT_NOT_HANDLED;
768 }
769 static u32 acpi_ec_gpe_intr_handler(void *data)
770 {
771 acpi_status status = AE_OK;
772 u32 value;
773 union acpi_ec *ec = (union acpi_ec *)data;
774
775 if (!ec)
776 return ACPI_INTERRUPT_NOT_HANDLED;
777
778 acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
779 value = acpi_ec_read_status(ec);
780
781 switch (ec->intr.expect_event) {
782 case ACPI_EC_EVENT_OBF:
783 if (!(value & ACPI_EC_FLAG_OBF))
784 break;
785 case ACPI_EC_EVENT_IBE:
786 if ((value & ACPI_EC_FLAG_IBF))
787 break;
788 ec->intr.expect_event = 0;
789 wake_up(&ec->intr.wait);
790 return ACPI_INTERRUPT_HANDLED;
791 default:
792 break;
793 }
794
795 if (value & ACPI_EC_FLAG_SCI) {
796 atomic_add(1, &ec->intr.pending_gpe);
797 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
798 acpi_ec_gpe_query, ec);
799 return status == AE_OK ?
800 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
801 }
802 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
803 return status == AE_OK ?
804 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
805 }
806
807 /* --------------------------------------------------------------------------
808 Address Space Management
809 -------------------------------------------------------------------------- */
810
811 static acpi_status
812 acpi_ec_space_setup(acpi_handle region_handle,
813 u32 function, void *handler_context, void **return_context)
814 {
815 /*
816 * The EC object is in the handler context and is needed
817 * when calling the acpi_ec_space_handler.
818 */
819 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
820 handler_context : NULL;
821
822 return AE_OK;
823 }
824
825 static acpi_status
826 acpi_ec_space_handler(u32 function,
827 acpi_physical_address address,
828 u32 bit_width,
829 acpi_integer * value,
830 void *handler_context, void *region_context)
831 {
832 int result = 0;
833 union acpi_ec *ec = NULL;
834 u64 temp = *value;
835 acpi_integer f_v = 0;
836 int i = 0;
837
838
839 if ((address > 0xFF) || !value || !handler_context)
840 return AE_BAD_PARAMETER;
841
842 if (bit_width != 8 && acpi_strict) {
843 printk(KERN_WARNING PREFIX
844 "acpi_ec_space_handler: bit_width should be 8\n");
845 return AE_BAD_PARAMETER;
846 }
847
848 ec = (union acpi_ec *)handler_context;
849
850 next_byte:
851 switch (function) {
852 case ACPI_READ:
853 temp = 0;
854 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
855 break;
856 case ACPI_WRITE:
857 result = acpi_ec_write(ec, (u8) address, (u8) temp);
858 break;
859 default:
860 result = -EINVAL;
861 goto out;
862 break;
863 }
864
865 bit_width -= 8;
866 if (bit_width) {
867 if (function == ACPI_READ)
868 f_v |= temp << 8 * i;
869 if (function == ACPI_WRITE)
870 temp >>= 8;
871 i++;
872 address++;
873 goto next_byte;
874 }
875
876 if (function == ACPI_READ) {
877 f_v |= temp << 8 * i;
878 *value = f_v;
879 }
880
881 out:
882 switch (result) {
883 case -EINVAL:
884 return AE_BAD_PARAMETER;
885 break;
886 case -ENODEV:
887 return AE_NOT_FOUND;
888 break;
889 case -ETIME:
890 return AE_TIME;
891 break;
892 default:
893 return AE_OK;
894 }
895 }
896
897 /* --------------------------------------------------------------------------
898 FS Interface (/proc)
899 -------------------------------------------------------------------------- */
900
901 static struct proc_dir_entry *acpi_ec_dir;
902
903 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
904 {
905 union acpi_ec *ec = (union acpi_ec *)seq->private;
906
907
908 if (!ec)
909 goto end;
910
911 seq_printf(seq, "gpe bit: 0x%02x\n",
912 (u32) ec->common.gpe_bit);
913 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
914 (u32) ec->common.status_addr.address,
915 (u32) ec->common.data_addr.address);
916 seq_printf(seq, "use global lock: %s\n",
917 ec->common.global_lock ? "yes" : "no");
918 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
919
920 end:
921 return 0;
922 }
923
924 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
925 {
926 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
927 }
928
929 static struct file_operations acpi_ec_info_ops = {
930 .open = acpi_ec_info_open_fs,
931 .read = seq_read,
932 .llseek = seq_lseek,
933 .release = single_release,
934 .owner = THIS_MODULE,
935 };
936
937 static int acpi_ec_add_fs(struct acpi_device *device)
938 {
939 struct proc_dir_entry *entry = NULL;
940
941
942 if (!acpi_device_dir(device)) {
943 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
944 acpi_ec_dir);
945 if (!acpi_device_dir(device))
946 return -ENODEV;
947 }
948
949 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
950 acpi_device_dir(device));
951 if (!entry)
952 return -ENODEV;
953 else {
954 entry->proc_fops = &acpi_ec_info_ops;
955 entry->data = acpi_driver_data(device);
956 entry->owner = THIS_MODULE;
957 }
958
959 return 0;
960 }
961
962 static int acpi_ec_remove_fs(struct acpi_device *device)
963 {
964
965 if (acpi_device_dir(device)) {
966 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
967 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
968 acpi_device_dir(device) = NULL;
969 }
970
971 return 0;
972 }
973
974 /* --------------------------------------------------------------------------
975 Driver Interface
976 -------------------------------------------------------------------------- */
977
978 static int acpi_ec_poll_add(struct acpi_device *device)
979 {
980 int result = 0;
981 acpi_status status = AE_OK;
982 union acpi_ec *ec = NULL;
983
984
985 if (!device)
986 return -EINVAL;
987
988 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
989 if (!ec)
990 return -ENOMEM;
991 memset(ec, 0, sizeof(union acpi_ec));
992
993 ec->common.handle = device->handle;
994 ec->common.uid = -1;
995 init_MUTEX(&ec->poll.sem);
996 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
997 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
998 acpi_driver_data(device) = ec;
999
1000 /* Use the global lock for all EC transactions? */
1001 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1002 &ec->common.global_lock);
1003
1004 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1005 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1006 if (ec_ecdt) {
1007 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1008 ACPI_ADR_SPACE_EC,
1009 &acpi_ec_space_handler);
1010
1011 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1012 &acpi_ec_gpe_handler);
1013
1014 kfree(ec_ecdt);
1015 }
1016
1017 /* Get GPE bit assignment (EC events). */
1018 /* TODO: Add support for _GPE returning a package */
1019 status =
1020 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1021 &ec->common.gpe_bit);
1022 if (ACPI_FAILURE(status)) {
1023 ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit"));
1024 result = -ENODEV;
1025 goto end;
1026 }
1027
1028 result = acpi_ec_add_fs(device);
1029 if (result)
1030 goto end;
1031
1032 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1033 acpi_device_name(device), acpi_device_bid(device),
1034 (u32) ec->common.gpe_bit);
1035
1036 if (!first_ec)
1037 first_ec = device;
1038
1039 end:
1040 if (result)
1041 kfree(ec);
1042
1043 return result;
1044 }
1045 static int acpi_ec_intr_add(struct acpi_device *device)
1046 {
1047 int result = 0;
1048 acpi_status status = AE_OK;
1049 union acpi_ec *ec = NULL;
1050
1051
1052 if (!device)
1053 return -EINVAL;
1054
1055 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1056 if (!ec)
1057 return -ENOMEM;
1058 memset(ec, 0, sizeof(union acpi_ec));
1059
1060 ec->common.handle = device->handle;
1061 ec->common.uid = -1;
1062 atomic_set(&ec->intr.pending_gpe, 0);
1063 atomic_set(&ec->intr.leaving_burst, 1);
1064 init_MUTEX(&ec->intr.sem);
1065 init_waitqueue_head(&ec->intr.wait);
1066 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1067 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1068 acpi_driver_data(device) = ec;
1069
1070 /* Use the global lock for all EC transactions? */
1071 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1072 &ec->common.global_lock);
1073
1074 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1075 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1076 if (ec_ecdt) {
1077 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1078 ACPI_ADR_SPACE_EC,
1079 &acpi_ec_space_handler);
1080
1081 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1082 &acpi_ec_gpe_handler);
1083
1084 kfree(ec_ecdt);
1085 }
1086
1087 /* Get GPE bit assignment (EC events). */
1088 /* TODO: Add support for _GPE returning a package */
1089 status =
1090 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1091 &ec->common.gpe_bit);
1092 if (ACPI_FAILURE(status)) {
1093 printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n");
1094 result = -ENODEV;
1095 goto end;
1096 }
1097
1098 result = acpi_ec_add_fs(device);
1099 if (result)
1100 goto end;
1101
1102 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1103 acpi_device_name(device), acpi_device_bid(device),
1104 (u32) ec->common.gpe_bit);
1105
1106 if (!first_ec)
1107 first_ec = device;
1108
1109 end:
1110 if (result)
1111 kfree(ec);
1112
1113 return result;
1114 }
1115
1116 static int acpi_ec_remove(struct acpi_device *device, int type)
1117 {
1118 union acpi_ec *ec = NULL;
1119
1120
1121 if (!device)
1122 return -EINVAL;
1123
1124 ec = acpi_driver_data(device);
1125
1126 acpi_ec_remove_fs(device);
1127
1128 kfree(ec);
1129
1130 return 0;
1131 }
1132
1133 static acpi_status
1134 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1135 {
1136 union acpi_ec *ec = (union acpi_ec *)context;
1137 struct acpi_generic_address *addr;
1138
1139 if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1140 return AE_OK;
1141 }
1142
1143 /*
1144 * The first address region returned is the data port, and
1145 * the second address region returned is the status/command
1146 * port.
1147 */
1148 if (ec->common.data_addr.register_bit_width == 0) {
1149 addr = &ec->common.data_addr;
1150 } else if (ec->common.command_addr.register_bit_width == 0) {
1151 addr = &ec->common.command_addr;
1152 } else {
1153 return AE_CTRL_TERMINATE;
1154 }
1155
1156 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1157 addr->register_bit_width = 8;
1158 addr->register_bit_offset = 0;
1159 addr->address = resource->data.io.minimum;
1160
1161 return AE_OK;
1162 }
1163
1164 static int acpi_ec_start(struct acpi_device *device)
1165 {
1166 acpi_status status = AE_OK;
1167 union acpi_ec *ec = NULL;
1168
1169
1170 if (!device)
1171 return -EINVAL;
1172
1173 ec = acpi_driver_data(device);
1174
1175 if (!ec)
1176 return -EINVAL;
1177
1178 /*
1179 * Get I/O port addresses. Convert to GAS format.
1180 */
1181 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1182 acpi_ec_io_ports, ec);
1183 if (ACPI_FAILURE(status)
1184 || ec->common.command_addr.register_bit_width == 0) {
1185 printk(KERN_ERR PREFIX "Error getting I/O port addresses\n");
1186 return -ENODEV;
1187 }
1188
1189 ec->common.status_addr = ec->common.command_addr;
1190
1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1192 (u32) ec->common.gpe_bit,
1193 (u32) ec->common.command_addr.address,
1194 (u32) ec->common.data_addr.address));
1195
1196 /*
1197 * Install GPE handler
1198 */
1199 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1200 ACPI_GPE_EDGE_TRIGGERED,
1201 &acpi_ec_gpe_handler, ec);
1202 if (ACPI_FAILURE(status)) {
1203 return -ENODEV;
1204 }
1205 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1206 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1207
1208 status = acpi_install_address_space_handler(ec->common.handle,
1209 ACPI_ADR_SPACE_EC,
1210 &acpi_ec_space_handler,
1211 &acpi_ec_space_setup, ec);
1212 if (ACPI_FAILURE(status)) {
1213 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1214 &acpi_ec_gpe_handler);
1215 return -ENODEV;
1216 }
1217
1218 return AE_OK;
1219 }
1220
1221 static int acpi_ec_stop(struct acpi_device *device, int type)
1222 {
1223 acpi_status status = AE_OK;
1224 union acpi_ec *ec = NULL;
1225
1226
1227 if (!device)
1228 return -EINVAL;
1229
1230 ec = acpi_driver_data(device);
1231
1232 status = acpi_remove_address_space_handler(ec->common.handle,
1233 ACPI_ADR_SPACE_EC,
1234 &acpi_ec_space_handler);
1235 if (ACPI_FAILURE(status))
1236 return -ENODEV;
1237
1238 status =
1239 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1240 &acpi_ec_gpe_handler);
1241 if (ACPI_FAILURE(status))
1242 return -ENODEV;
1243
1244 return 0;
1245 }
1246
1247 static acpi_status __init
1248 acpi_fake_ecdt_callback(acpi_handle handle,
1249 u32 Level, void *context, void **retval)
1250 {
1251
1252 if (acpi_ec_poll_mode)
1253 return acpi_fake_ecdt_poll_callback(handle,
1254 Level, context, retval);
1255 else
1256 return acpi_fake_ecdt_intr_callback(handle,
1257 Level, context, retval);
1258 }
1259
1260 static acpi_status __init
1261 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1262 u32 Level, void *context, void **retval)
1263 {
1264 acpi_status status;
1265
1266 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1267 acpi_ec_io_ports, ec_ecdt);
1268 if (ACPI_FAILURE(status))
1269 return status;
1270 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1271
1272 ec_ecdt->common.uid = -1;
1273 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1274
1275 status =
1276 acpi_evaluate_integer(handle, "_GPE", NULL,
1277 &ec_ecdt->common.gpe_bit);
1278 if (ACPI_FAILURE(status))
1279 return status;
1280 init_MUTEX(&ec_ecdt->poll.sem);
1281 ec_ecdt->common.global_lock = TRUE;
1282 ec_ecdt->common.handle = handle;
1283
1284 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1285 (u32) ec_ecdt->common.gpe_bit,
1286 (u32) ec_ecdt->common.command_addr.address,
1287 (u32) ec_ecdt->common.data_addr.address);
1288
1289 return AE_CTRL_TERMINATE;
1290 }
1291
1292 static acpi_status __init
1293 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1294 u32 Level, void *context, void **retval)
1295 {
1296 acpi_status status;
1297
1298 init_MUTEX(&ec_ecdt->intr.sem);
1299 init_waitqueue_head(&ec_ecdt->intr.wait);
1300 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1301 acpi_ec_io_ports, ec_ecdt);
1302 if (ACPI_FAILURE(status))
1303 return status;
1304 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1305
1306 ec_ecdt->common.uid = -1;
1307 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1308
1309 status =
1310 acpi_evaluate_integer(handle, "_GPE", NULL,
1311 &ec_ecdt->common.gpe_bit);
1312 if (ACPI_FAILURE(status))
1313 return status;
1314 ec_ecdt->common.global_lock = TRUE;
1315 ec_ecdt->common.handle = handle;
1316
1317 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1318 (u32) ec_ecdt->common.gpe_bit,
1319 (u32) ec_ecdt->common.command_addr.address,
1320 (u32) ec_ecdt->common.data_addr.address);
1321
1322 return AE_CTRL_TERMINATE;
1323 }
1324
1325 /*
1326 * Some BIOS (such as some from Gateway laptops) access EC region very early
1327 * such as in BAT0._INI or EC._INI before an EC device is found and
1328 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1329 * required, but if EC regison is accessed early, it is required.
1330 * The routine tries to workaround the BIOS bug by pre-scan EC device
1331 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1332 * op region (since _REG isn't invoked yet). The assumption is true for
1333 * all systems found.
1334 */
1335 static int __init acpi_ec_fake_ecdt(void)
1336 {
1337 acpi_status status;
1338 int ret = 0;
1339
1340 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1341
1342 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1343 if (!ec_ecdt) {
1344 ret = -ENOMEM;
1345 goto error;
1346 }
1347 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1348
1349 status = acpi_get_devices(ACPI_EC_HID,
1350 acpi_fake_ecdt_callback, NULL, NULL);
1351 if (ACPI_FAILURE(status)) {
1352 kfree(ec_ecdt);
1353 ec_ecdt = NULL;
1354 ret = -ENODEV;
1355 goto error;
1356 }
1357 return 0;
1358 error:
1359 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1360 return ret;
1361 }
1362
1363 static int __init acpi_ec_get_real_ecdt(void)
1364 {
1365 if (acpi_ec_poll_mode)
1366 return acpi_ec_poll_get_real_ecdt();
1367 else
1368 return acpi_ec_intr_get_real_ecdt();
1369 }
1370
1371 static int __init acpi_ec_poll_get_real_ecdt(void)
1372 {
1373 acpi_status status;
1374 struct acpi_table_ecdt *ecdt_ptr;
1375
1376 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1377 (struct acpi_table_header **)
1378 &ecdt_ptr);
1379 if (ACPI_FAILURE(status))
1380 return -ENODEV;
1381
1382 printk(KERN_INFO PREFIX "Found ECDT\n");
1383
1384 /*
1385 * Generate a temporary ec context to use until the namespace is scanned
1386 */
1387 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1388 if (!ec_ecdt)
1389 return -ENOMEM;
1390 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1391
1392 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1393 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1394 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1395 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1396 init_MUTEX(&ec_ecdt->poll.sem);
1397 /* use the GL just to be safe */
1398 ec_ecdt->common.global_lock = TRUE;
1399 ec_ecdt->common.uid = ecdt_ptr->uid;
1400
1401 status =
1402 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1403 if (ACPI_FAILURE(status)) {
1404 goto error;
1405 }
1406
1407 return 0;
1408 error:
1409 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1410 kfree(ec_ecdt);
1411 ec_ecdt = NULL;
1412
1413 return -ENODEV;
1414 }
1415
1416 static int __init acpi_ec_intr_get_real_ecdt(void)
1417 {
1418 acpi_status status;
1419 struct acpi_table_ecdt *ecdt_ptr;
1420
1421 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1422 (struct acpi_table_header **)
1423 &ecdt_ptr);
1424 if (ACPI_FAILURE(status))
1425 return -ENODEV;
1426
1427 printk(KERN_INFO PREFIX "Found ECDT\n");
1428
1429 /*
1430 * Generate a temporary ec context to use until the namespace is scanned
1431 */
1432 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1433 if (!ec_ecdt)
1434 return -ENOMEM;
1435 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1436
1437 init_MUTEX(&ec_ecdt->intr.sem);
1438 init_waitqueue_head(&ec_ecdt->intr.wait);
1439 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1440 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1441 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1442 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1443 /* use the GL just to be safe */
1444 ec_ecdt->common.global_lock = TRUE;
1445 ec_ecdt->common.uid = ecdt_ptr->uid;
1446
1447 status =
1448 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1449 if (ACPI_FAILURE(status)) {
1450 goto error;
1451 }
1452
1453 return 0;
1454 error:
1455 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1456 kfree(ec_ecdt);
1457 ec_ecdt = NULL;
1458
1459 return -ENODEV;
1460 }
1461
1462 static int __initdata acpi_fake_ecdt_enabled;
1463 int __init acpi_ec_ecdt_probe(void)
1464 {
1465 acpi_status status;
1466 int ret;
1467
1468 ret = acpi_ec_get_real_ecdt();
1469 /* Try to make a fake ECDT */
1470 if (ret && acpi_fake_ecdt_enabled) {
1471 ret = acpi_ec_fake_ecdt();
1472 }
1473
1474 if (ret)
1475 return 0;
1476
1477 /*
1478 * Install GPE handler
1479 */
1480 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1481 ACPI_GPE_EDGE_TRIGGERED,
1482 &acpi_ec_gpe_handler, ec_ecdt);
1483 if (ACPI_FAILURE(status)) {
1484 goto error;
1485 }
1486 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1487 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1488
1489 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1490 ACPI_ADR_SPACE_EC,
1491 &acpi_ec_space_handler,
1492 &acpi_ec_space_setup,
1493 ec_ecdt);
1494 if (ACPI_FAILURE(status)) {
1495 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1496 &acpi_ec_gpe_handler);
1497 goto error;
1498 }
1499
1500 return 0;
1501
1502 error:
1503 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1504 kfree(ec_ecdt);
1505 ec_ecdt = NULL;
1506
1507 return -ENODEV;
1508 }
1509
1510 static int __init acpi_ec_init(void)
1511 {
1512 int result = 0;
1513
1514
1515 if (acpi_disabled)
1516 return 0;
1517
1518 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1519 if (!acpi_ec_dir)
1520 return -ENODEV;
1521
1522 /* Now register the driver for the EC */
1523 result = acpi_bus_register_driver(&acpi_ec_driver);
1524 if (result < 0) {
1525 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1526 return -ENODEV;
1527 }
1528
1529 return result;
1530 }
1531
1532 subsys_initcall(acpi_ec_init);
1533
1534 /* EC driver currently not unloadable */
1535 #if 0
1536 static void __exit acpi_ec_exit(void)
1537 {
1538
1539 acpi_bus_unregister_driver(&acpi_ec_driver);
1540
1541 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1542
1543 return;
1544 }
1545 #endif /* 0 */
1546
1547 static int __init acpi_fake_ecdt_setup(char *str)
1548 {
1549 acpi_fake_ecdt_enabled = 1;
1550 return 1;
1551 }
1552
1553 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1554 static int __init acpi_ec_set_intr_mode(char *str)
1555 {
1556 int intr;
1557
1558 if (!get_option(&str, &intr))
1559 return 0;
1560
1561 if (intr) {
1562 acpi_ec_poll_mode = EC_INTR;
1563 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1564 } else {
1565 acpi_ec_poll_mode = EC_POLL;
1566 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1567 }
1568 printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1569 return 1;
1570 }
1571
1572 __setup("ec_intr=", acpi_ec_set_intr_mode);
Linux kernel - Deliverables
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