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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / acpi / ec.c
blobeee0864ba300a6d8f2287f5919d8cd2fffa4e49b
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 spinlock_t lock;
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 unsigned long flags = 0;
327 u32 glk = 0;
328
329 ACPI_FUNCTION_TRACE("acpi_ec_read");
330
331 if (!ec || !data)
332 return_VALUE(-EINVAL);
333
334 *data = 0;
335
336 if (ec->common.global_lock) {
337 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
338 if (ACPI_FAILURE(status))
339 return_VALUE(-ENODEV);
340 }
341
342 spin_lock_irqsave(&ec->poll.lock, flags);
343
344 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
345 &ec->common.command_addr);
346 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
347 if (result)
348 goto end;
349
350 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
351 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
352 if (result)
353 goto end;
354
355 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
356
357 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
358 *data, address));
359
360 end:
361 spin_unlock_irqrestore(&ec->poll.lock, flags);
362
363 if (ec->common.global_lock)
364 acpi_release_global_lock(glk);
365
366 return_VALUE(result);
367 }
368
369 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
370 {
371 int result = 0;
372 acpi_status status = AE_OK;
373 unsigned long flags = 0;
374 u32 glk = 0;
375
376 ACPI_FUNCTION_TRACE("acpi_ec_write");
377
378 if (!ec)
379 return_VALUE(-EINVAL);
380
381 if (ec->common.global_lock) {
382 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
383 if (ACPI_FAILURE(status))
384 return_VALUE(-ENODEV);
385 }
386
387 spin_lock_irqsave(&ec->poll.lock, flags);
388
389 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
390 &ec->common.command_addr);
391 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
392 if (result)
393 goto end;
394
395 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
396 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
397 if (result)
398 goto end;
399
400 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
401 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
402 if (result)
403 goto end;
404
405 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
406 data, address));
407
408 end:
409 spin_unlock_irqrestore(&ec->poll.lock, flags);
410
411 if (ec->common.global_lock)
412 acpi_release_global_lock(glk);
413
414 return_VALUE(result);
415 }
416
417 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
418 {
419 int status = 0;
420 u32 glk;
421
422 ACPI_FUNCTION_TRACE("acpi_ec_read");
423
424 if (!ec || !data)
425 return_VALUE(-EINVAL);
426
427 *data = 0;
428
429 if (ec->common.global_lock) {
430 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
431 if (ACPI_FAILURE(status))
432 return_VALUE(-ENODEV);
433 }
434
435 WARN_ON(in_interrupt());
436 down(&ec->intr.sem);
437
438 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
439 if (status) {
440 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
441 goto end;
442 }
443 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
444 &ec->common.command_addr);
445 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
446 if (status) {
447 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
448 }
449
450 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
451 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
452 if (status) {
453 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
454 goto end;
455 }
456 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
457 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
458 *data, address));
459
460 end:
461 up(&ec->intr.sem);
462
463 if (ec->common.global_lock)
464 acpi_release_global_lock(glk);
465
466 return_VALUE(status);
467 }
468
469 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
470 {
471 int status = 0;
472 u32 glk;
473
474 ACPI_FUNCTION_TRACE("acpi_ec_write");
475
476 if (!ec)
477 return_VALUE(-EINVAL);
478
479 if (ec->common.global_lock) {
480 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
481 if (ACPI_FAILURE(status))
482 return_VALUE(-ENODEV);
483 }
484
485 WARN_ON(in_interrupt());
486 down(&ec->intr.sem);
487
488 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
489 if (status) {
490 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
491 }
492 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
493 &ec->common.command_addr);
494 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
495 if (status) {
496 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
497 }
498
499 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
500 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
501 if (status) {
502 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
503 }
504
505 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
506
507 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
508 data, address));
509
510 up(&ec->intr.sem);
511
512 if (ec->common.global_lock)
513 acpi_release_global_lock(glk);
514
515 return_VALUE(status);
516 }
517
518 /*
519 * Externally callable EC access functions. For now, assume 1 EC only
520 */
521 int ec_read(u8 addr, u8 * val)
522 {
523 union acpi_ec *ec;
524 int err;
525 u32 temp_data;
526
527 if (!first_ec)
528 return -ENODEV;
529
530 ec = acpi_driver_data(first_ec);
531
532 err = acpi_ec_read(ec, addr, &temp_data);
533
534 if (!err) {
535 *val = temp_data;
536 return 0;
537 } else
538 return err;
539 }
540
541 EXPORT_SYMBOL(ec_read);
542
543 int ec_write(u8 addr, u8 val)
544 {
545 union acpi_ec *ec;
546 int err;
547
548 if (!first_ec)
549 return -ENODEV;
550
551 ec = acpi_driver_data(first_ec);
552
553 err = acpi_ec_write(ec, addr, val);
554
555 return err;
556 }
557
558 EXPORT_SYMBOL(ec_write);
559
560 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
561 {
562 if (acpi_ec_poll_mode)
563 return acpi_ec_poll_query(ec, data);
564 else
565 return acpi_ec_intr_query(ec, data);
566 }
567 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
568 {
569 int result = 0;
570 acpi_status status = AE_OK;
571 unsigned long flags = 0;
572 u32 glk = 0;
573
574 ACPI_FUNCTION_TRACE("acpi_ec_query");
575
576 if (!ec || !data)
577 return_VALUE(-EINVAL);
578
579 *data = 0;
580
581 if (ec->common.global_lock) {
582 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
583 if (ACPI_FAILURE(status))
584 return_VALUE(-ENODEV);
585 }
586
587 /*
588 * Query the EC to find out which _Qxx method we need to evaluate.
589 * Note that successful completion of the query causes the ACPI_EC_SCI
590 * bit to be cleared (and thus clearing the interrupt source).
591 */
592 spin_lock_irqsave(&ec->poll.lock, flags);
593
594 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
595 &ec->common.command_addr);
596 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
597 if (result)
598 goto end;
599
600 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
601 if (!*data)
602 result = -ENODATA;
603
604 end:
605 spin_unlock_irqrestore(&ec->poll.lock, flags);
606
607 if (ec->common.global_lock)
608 acpi_release_global_lock(glk);
609
610 return_VALUE(result);
611 }
612 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
613 {
614 int status = 0;
615 u32 glk;
616
617 ACPI_FUNCTION_TRACE("acpi_ec_query");
618
619 if (!ec || !data)
620 return_VALUE(-EINVAL);
621 *data = 0;
622
623 if (ec->common.global_lock) {
624 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
625 if (ACPI_FAILURE(status))
626 return_VALUE(-ENODEV);
627 }
628
629 down(&ec->intr.sem);
630
631 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
632 if (status) {
633 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
634 goto end;
635 }
636 /*
637 * Query the EC to find out which _Qxx method we need to evaluate.
638 * Note that successful completion of the query causes the ACPI_EC_SCI
639 * bit to be cleared (and thus clearing the interrupt source).
640 */
641 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
642 &ec->common.command_addr);
643 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
644 if (status) {
645 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
646 goto end;
647 }
648
649 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
650 if (!*data)
651 status = -ENODATA;
652
653 end:
654 up(&ec->intr.sem);
655
656 if (ec->common.global_lock)
657 acpi_release_global_lock(glk);
658
659 return_VALUE(status);
660 }
661
662 /* --------------------------------------------------------------------------
663 Event Management
664 -------------------------------------------------------------------------- */
665
666 union acpi_ec_query_data {
667 acpi_handle handle;
668 u8 data;
669 };
670
671 static void acpi_ec_gpe_query(void *ec_cxt)
672 {
673 if (acpi_ec_poll_mode)
674 acpi_ec_gpe_poll_query(ec_cxt);
675 else
676 acpi_ec_gpe_intr_query(ec_cxt);
677 }
678
679 static void acpi_ec_gpe_poll_query(void *ec_cxt)
680 {
681 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
682 u32 value = 0;
683 unsigned long flags = 0;
684 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
685 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
686 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
687 };
688
689 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
690
691 if (!ec_cxt)
692 goto end;
693
694 spin_lock_irqsave(&ec->poll.lock, flags);
695 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
696 spin_unlock_irqrestore(&ec->poll.lock, flags);
697
698 /* TBD: Implement asynch events!
699 * NOTE: All we care about are EC-SCI's. Other EC events are
700 * handled via polling (yuck!). This is because some systems
701 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
702 * a purely interrupt-driven approach (grumble, grumble).
703 */
704 if (!(value & ACPI_EC_FLAG_SCI))
705 goto end;
706
707 if (acpi_ec_query(ec, &value))
708 goto end;
709
710 object_name[2] = hex[((value >> 4) & 0x0F)];
711 object_name[3] = hex[(value & 0x0F)];
712
713 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
714
715 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
716
717 end:
718 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
719 }
720 static void acpi_ec_gpe_intr_query(void *ec_cxt)
721 {
722 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
723 u32 value;
724 int result = -ENODATA;
725 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
726 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
727 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
728 };
729
730 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
731
732 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
733 result = acpi_ec_query(ec, &value);
734
735 if (result)
736 goto end;
737
738 object_name[2] = hex[((value >> 4) & 0x0F)];
739 object_name[3] = hex[(value & 0x0F)];
740
741 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
742
743 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
744 end:
745 atomic_dec(&ec->intr.pending_gpe);
746 return;
747 }
748
749 static u32 acpi_ec_gpe_handler(void *data)
750 {
751 if (acpi_ec_poll_mode)
752 return acpi_ec_gpe_poll_handler(data);
753 else
754 return acpi_ec_gpe_intr_handler(data);
755 }
756 static u32 acpi_ec_gpe_poll_handler(void *data)
757 {
758 acpi_status status = AE_OK;
759 union acpi_ec *ec = (union acpi_ec *)data;
760
761 if (!ec)
762 return ACPI_INTERRUPT_NOT_HANDLED;
763
764 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
765
766 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
767 acpi_ec_gpe_query, ec);
768
769 if (status == AE_OK)
770 return ACPI_INTERRUPT_HANDLED;
771 else
772 return ACPI_INTERRUPT_NOT_HANDLED;
773 }
774 static u32 acpi_ec_gpe_intr_handler(void *data)
775 {
776 acpi_status status = AE_OK;
777 u32 value;
778 union acpi_ec *ec = (union acpi_ec *)data;
779
780 if (!ec)
781 return ACPI_INTERRUPT_NOT_HANDLED;
782
783 acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
784 value = acpi_ec_read_status(ec);
785
786 switch (ec->intr.expect_event) {
787 case ACPI_EC_EVENT_OBF:
788 if (!(value & ACPI_EC_FLAG_OBF))
789 break;
790 case ACPI_EC_EVENT_IBE:
791 if ((value & ACPI_EC_FLAG_IBF))
792 break;
793 ec->intr.expect_event = 0;
794 wake_up(&ec->intr.wait);
795 return ACPI_INTERRUPT_HANDLED;
796 default:
797 break;
798 }
799
800 if (value & ACPI_EC_FLAG_SCI) {
801 atomic_add(1, &ec->intr.pending_gpe);
802 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
803 acpi_ec_gpe_query, ec);
804 return status == AE_OK ?
805 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
806 }
807 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
808 return status == AE_OK ?
809 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
810 }
811
812 /* --------------------------------------------------------------------------
813 Address Space Management
814 -------------------------------------------------------------------------- */
815
816 static acpi_status
817 acpi_ec_space_setup(acpi_handle region_handle,
818 u32 function, void *handler_context, void **return_context)
819 {
820 /*
821 * The EC object is in the handler context and is needed
822 * when calling the acpi_ec_space_handler.
823 */
824 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
825 handler_context : NULL;
826
827 return AE_OK;
828 }
829
830 static acpi_status
831 acpi_ec_space_handler(u32 function,
832 acpi_physical_address address,
833 u32 bit_width,
834 acpi_integer * value,
835 void *handler_context, void *region_context)
836 {
837 int result = 0;
838 union acpi_ec *ec = NULL;
839 u64 temp = *value;
840 acpi_integer f_v = 0;
841 int i = 0;
842
843 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
844
845 if ((address > 0xFF) || !value || !handler_context)
846 return_VALUE(AE_BAD_PARAMETER);
847
848 if (bit_width != 8 && acpi_strict) {
849 printk(KERN_WARNING PREFIX
850 "acpi_ec_space_handler: bit_width should be 8\n");
851 return_VALUE(AE_BAD_PARAMETER);
852 }
853
854 ec = (union acpi_ec *)handler_context;
855
856 next_byte:
857 switch (function) {
858 case ACPI_READ:
859 temp = 0;
860 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
861 break;
862 case ACPI_WRITE:
863 result = acpi_ec_write(ec, (u8) address, (u8) temp);
864 break;
865 default:
866 result = -EINVAL;
867 goto out;
868 break;
869 }
870
871 bit_width -= 8;
872 if (bit_width) {
873 if (function == ACPI_READ)
874 f_v |= temp << 8 * i;
875 if (function == ACPI_WRITE)
876 temp >>= 8;
877 i++;
878 address++;
879 goto next_byte;
880 }
881
882 if (function == ACPI_READ) {
883 f_v |= temp << 8 * i;
884 *value = f_v;
885 }
886
887 out:
888 switch (result) {
889 case -EINVAL:
890 return_VALUE(AE_BAD_PARAMETER);
891 break;
892 case -ENODEV:
893 return_VALUE(AE_NOT_FOUND);
894 break;
895 case -ETIME:
896 return_VALUE(AE_TIME);
897 break;
898 default:
899 return_VALUE(AE_OK);
900 }
901 }
902
903 /* --------------------------------------------------------------------------
904 FS Interface (/proc)
905 -------------------------------------------------------------------------- */
906
907 static struct proc_dir_entry *acpi_ec_dir;
908
909 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
910 {
911 union acpi_ec *ec = (union acpi_ec *)seq->private;
912
913 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
914
915 if (!ec)
916 goto end;
917
918 seq_printf(seq, "gpe bit: 0x%02x\n",
919 (u32) ec->common.gpe_bit);
920 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
921 (u32) ec->common.status_addr.address,
922 (u32) ec->common.data_addr.address);
923 seq_printf(seq, "use global lock: %s\n",
924 ec->common.global_lock ? "yes" : "no");
925 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
926
927 end:
928 return_VALUE(0);
929 }
930
931 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
932 {
933 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
934 }
935
936 static struct file_operations acpi_ec_info_ops = {
937 .open = acpi_ec_info_open_fs,
938 .read = seq_read,
939 .llseek = seq_lseek,
940 .release = single_release,
941 .owner = THIS_MODULE,
942 };
943
944 static int acpi_ec_add_fs(struct acpi_device *device)
945 {
946 struct proc_dir_entry *entry = NULL;
947
948 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
949
950 if (!acpi_device_dir(device)) {
951 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
952 acpi_ec_dir);
953 if (!acpi_device_dir(device))
954 return_VALUE(-ENODEV);
955 }
956
957 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
958 acpi_device_dir(device));
959 if (!entry)
960 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
961 "Unable to create '%s' fs entry\n",
962 ACPI_EC_FILE_INFO));
963 else {
964 entry->proc_fops = &acpi_ec_info_ops;
965 entry->data = acpi_driver_data(device);
966 entry->owner = THIS_MODULE;
967 }
968
969 return_VALUE(0);
970 }
971
972 static int acpi_ec_remove_fs(struct acpi_device *device)
973 {
974 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
975
976 if (acpi_device_dir(device)) {
977 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
978 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
979 acpi_device_dir(device) = NULL;
980 }
981
982 return_VALUE(0);
983 }
984
985 /* --------------------------------------------------------------------------
986 Driver Interface
987 -------------------------------------------------------------------------- */
988
989 static int acpi_ec_poll_add(struct acpi_device *device)
990 {
991 int result = 0;
992 acpi_status status = AE_OK;
993 union acpi_ec *ec = NULL;
994 unsigned long uid;
995
996 ACPI_FUNCTION_TRACE("acpi_ec_add");
997
998 if (!device)
999 return_VALUE(-EINVAL);
1000
1001 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1002 if (!ec)
1003 return_VALUE(-ENOMEM);
1004 memset(ec, 0, sizeof(union acpi_ec));
1005
1006 ec->common.handle = device->handle;
1007 ec->common.uid = -1;
1008 spin_lock_init(&ec->poll.lock);
1009 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1010 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1011 acpi_driver_data(device) = ec;
1012
1013 /* Use the global lock for all EC transactions? */
1014 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1015 &ec->common.global_lock);
1016
1017 /* If our UID matches the UID for the ECDT-enumerated EC,
1018 we now have the *real* EC info, so kill the makeshift one. */
1019 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1020 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1021 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1022 ACPI_ADR_SPACE_EC,
1023 &acpi_ec_space_handler);
1024
1025 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1026 &acpi_ec_gpe_handler);
1027
1028 kfree(ec_ecdt);
1029 }
1030
1031 /* Get GPE bit assignment (EC events). */
1032 /* TODO: Add support for _GPE returning a package */
1033 status =
1034 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1035 &ec->common.gpe_bit);
1036 if (ACPI_FAILURE(status)) {
1037 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1038 "Error obtaining GPE bit assignment\n"));
1039 result = -ENODEV;
1040 goto end;
1041 }
1042
1043 result = acpi_ec_add_fs(device);
1044 if (result)
1045 goto end;
1046
1047 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1048 acpi_device_name(device), acpi_device_bid(device),
1049 (u32) ec->common.gpe_bit);
1050
1051 if (!first_ec)
1052 first_ec = device;
1053
1054 end:
1055 if (result)
1056 kfree(ec);
1057
1058 return_VALUE(result);
1059 }
1060 static int acpi_ec_intr_add(struct acpi_device *device)
1061 {
1062 int result = 0;
1063 acpi_status status = AE_OK;
1064 union acpi_ec *ec = NULL;
1065 unsigned long uid;
1066
1067 ACPI_FUNCTION_TRACE("acpi_ec_add");
1068
1069 if (!device)
1070 return_VALUE(-EINVAL);
1071
1072 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1073 if (!ec)
1074 return_VALUE(-ENOMEM);
1075 memset(ec, 0, sizeof(union acpi_ec));
1076
1077 ec->common.handle = device->handle;
1078 ec->common.uid = -1;
1079 atomic_set(&ec->intr.pending_gpe, 0);
1080 atomic_set(&ec->intr.leaving_burst, 1);
1081 init_MUTEX(&ec->intr.sem);
1082 init_waitqueue_head(&ec->intr.wait);
1083 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1084 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1085 acpi_driver_data(device) = ec;
1086
1087 /* Use the global lock for all EC transactions? */
1088 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1089 &ec->common.global_lock);
1090
1091 /* If our UID matches the UID for the ECDT-enumerated EC,
1092 we now have the *real* EC info, so kill the makeshift one. */
1093 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1094 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1095 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1096 ACPI_ADR_SPACE_EC,
1097 &acpi_ec_space_handler);
1098
1099 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1100 &acpi_ec_gpe_handler);
1101
1102 kfree(ec_ecdt);
1103 }
1104
1105 /* Get GPE bit assignment (EC events). */
1106 /* TODO: Add support for _GPE returning a package */
1107 status =
1108 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1109 &ec->common.gpe_bit);
1110 if (ACPI_FAILURE(status)) {
1111 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1112 "Error obtaining GPE bit assignment\n"));
1113 result = -ENODEV;
1114 goto end;
1115 }
1116
1117 result = acpi_ec_add_fs(device);
1118 if (result)
1119 goto end;
1120
1121 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1122 acpi_device_name(device), acpi_device_bid(device),
1123 (u32) ec->common.gpe_bit);
1124
1125 if (!first_ec)
1126 first_ec = device;
1127
1128 end:
1129 if (result)
1130 kfree(ec);
1131
1132 return_VALUE(result);
1133 }
1134
1135 static int acpi_ec_remove(struct acpi_device *device, int type)
1136 {
1137 union acpi_ec *ec = NULL;
1138
1139 ACPI_FUNCTION_TRACE("acpi_ec_remove");
1140
1141 if (!device)
1142 return_VALUE(-EINVAL);
1143
1144 ec = acpi_driver_data(device);
1145
1146 acpi_ec_remove_fs(device);
1147
1148 kfree(ec);
1149
1150 return_VALUE(0);
1151 }
1152
1153 static acpi_status
1154 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1155 {
1156 union acpi_ec *ec = (union acpi_ec *)context;
1157 struct acpi_generic_address *addr;
1158
1159 if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1160 return AE_OK;
1161 }
1162
1163 /*
1164 * The first address region returned is the data port, and
1165 * the second address region returned is the status/command
1166 * port.
1167 */
1168 if (ec->common.data_addr.register_bit_width == 0) {
1169 addr = &ec->common.data_addr;
1170 } else if (ec->common.command_addr.register_bit_width == 0) {
1171 addr = &ec->common.command_addr;
1172 } else {
1173 return AE_CTRL_TERMINATE;
1174 }
1175
1176 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1177 addr->register_bit_width = 8;
1178 addr->register_bit_offset = 0;
1179 addr->address = resource->data.io.minimum;
1180
1181 return AE_OK;
1182 }
1183
1184 static int acpi_ec_start(struct acpi_device *device)
1185 {
1186 acpi_status status = AE_OK;
1187 union acpi_ec *ec = NULL;
1188
1189 ACPI_FUNCTION_TRACE("acpi_ec_start");
1190
1191 if (!device)
1192 return_VALUE(-EINVAL);
1193
1194 ec = acpi_driver_data(device);
1195
1196 if (!ec)
1197 return_VALUE(-EINVAL);
1198
1199 /*
1200 * Get I/O port addresses. Convert to GAS format.
1201 */
1202 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1203 acpi_ec_io_ports, ec);
1204 if (ACPI_FAILURE(status)
1205 || ec->common.command_addr.register_bit_width == 0) {
1206 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1207 "Error getting I/O port addresses"));
1208 return_VALUE(-ENODEV);
1209 }
1210
1211 ec->common.status_addr = ec->common.command_addr;
1212
1213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1214 (u32) ec->common.gpe_bit,
1215 (u32) ec->common.command_addr.address,
1216 (u32) ec->common.data_addr.address));
1217
1218 /*
1219 * Install GPE handler
1220 */
1221 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1222 ACPI_GPE_EDGE_TRIGGERED,
1223 &acpi_ec_gpe_handler, ec);
1224 if (ACPI_FAILURE(status)) {
1225 return_VALUE(-ENODEV);
1226 }
1227 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1228 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1229
1230 status = acpi_install_address_space_handler(ec->common.handle,
1231 ACPI_ADR_SPACE_EC,
1232 &acpi_ec_space_handler,
1233 &acpi_ec_space_setup, ec);
1234 if (ACPI_FAILURE(status)) {
1235 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1236 &acpi_ec_gpe_handler);
1237 return_VALUE(-ENODEV);
1238 }
1239
1240 return_VALUE(AE_OK);
1241 }
1242
1243 static int acpi_ec_stop(struct acpi_device *device, int type)
1244 {
1245 acpi_status status = AE_OK;
1246 union acpi_ec *ec = NULL;
1247
1248 ACPI_FUNCTION_TRACE("acpi_ec_stop");
1249
1250 if (!device)
1251 return_VALUE(-EINVAL);
1252
1253 ec = acpi_driver_data(device);
1254
1255 status = acpi_remove_address_space_handler(ec->common.handle,
1256 ACPI_ADR_SPACE_EC,
1257 &acpi_ec_space_handler);
1258 if (ACPI_FAILURE(status))
1259 return_VALUE(-ENODEV);
1260
1261 status =
1262 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1263 &acpi_ec_gpe_handler);
1264 if (ACPI_FAILURE(status))
1265 return_VALUE(-ENODEV);
1266
1267 return_VALUE(0);
1268 }
1269
1270 static acpi_status __init
1271 acpi_fake_ecdt_callback(acpi_handle handle,
1272 u32 Level, void *context, void **retval)
1273 {
1274
1275 if (acpi_ec_poll_mode)
1276 return acpi_fake_ecdt_poll_callback(handle,
1277 Level, context, retval);
1278 else
1279 return acpi_fake_ecdt_intr_callback(handle,
1280 Level, context, retval);
1281 }
1282
1283 static acpi_status __init
1284 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1285 u32 Level, void *context, void **retval)
1286 {
1287 acpi_status status;
1288
1289 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1290 acpi_ec_io_ports, ec_ecdt);
1291 if (ACPI_FAILURE(status))
1292 return status;
1293 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1294
1295 ec_ecdt->common.uid = -1;
1296 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1297
1298 status =
1299 acpi_evaluate_integer(handle, "_GPE", NULL,
1300 &ec_ecdt->common.gpe_bit);
1301 if (ACPI_FAILURE(status))
1302 return status;
1303 spin_lock_init(&ec_ecdt->poll.lock);
1304 ec_ecdt->common.global_lock = TRUE;
1305 ec_ecdt->common.handle = handle;
1306
1307 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1308 (u32) ec_ecdt->common.gpe_bit,
1309 (u32) ec_ecdt->common.command_addr.address,
1310 (u32) ec_ecdt->common.data_addr.address);
1311
1312 return AE_CTRL_TERMINATE;
1313 }
1314
1315 static acpi_status __init
1316 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1317 u32 Level, void *context, void **retval)
1318 {
1319 acpi_status status;
1320
1321 init_MUTEX(&ec_ecdt->intr.sem);
1322 init_waitqueue_head(&ec_ecdt->intr.wait);
1323 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1324 acpi_ec_io_ports, ec_ecdt);
1325 if (ACPI_FAILURE(status))
1326 return status;
1327 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1328
1329 ec_ecdt->common.uid = -1;
1330 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1331
1332 status =
1333 acpi_evaluate_integer(handle, "_GPE", NULL,
1334 &ec_ecdt->common.gpe_bit);
1335 if (ACPI_FAILURE(status))
1336 return status;
1337 ec_ecdt->common.global_lock = TRUE;
1338 ec_ecdt->common.handle = handle;
1339
1340 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1341 (u32) ec_ecdt->common.gpe_bit,
1342 (u32) ec_ecdt->common.command_addr.address,
1343 (u32) ec_ecdt->common.data_addr.address);
1344
1345 return AE_CTRL_TERMINATE;
1346 }
1347
1348 /*
1349 * Some BIOS (such as some from Gateway laptops) access EC region very early
1350 * such as in BAT0._INI or EC._INI before an EC device is found and
1351 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1352 * required, but if EC regison is accessed early, it is required.
1353 * The routine tries to workaround the BIOS bug by pre-scan EC device
1354 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1355 * op region (since _REG isn't invoked yet). The assumption is true for
1356 * all systems found.
1357 */
1358 static int __init acpi_ec_fake_ecdt(void)
1359 {
1360 acpi_status status;
1361 int ret = 0;
1362
1363 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1364
1365 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1366 if (!ec_ecdt) {
1367 ret = -ENOMEM;
1368 goto error;
1369 }
1370 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1371
1372 status = acpi_get_devices(ACPI_EC_HID,
1373 acpi_fake_ecdt_callback, NULL, NULL);
1374 if (ACPI_FAILURE(status)) {
1375 kfree(ec_ecdt);
1376 ec_ecdt = NULL;
1377 ret = -ENODEV;
1378 goto error;
1379 }
1380 return 0;
1381 error:
1382 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1383 return ret;
1384 }
1385
1386 static int __init acpi_ec_get_real_ecdt(void)
1387 {
1388 if (acpi_ec_poll_mode)
1389 return acpi_ec_poll_get_real_ecdt();
1390 else
1391 return acpi_ec_intr_get_real_ecdt();
1392 }
1393
1394 static int __init acpi_ec_poll_get_real_ecdt(void)
1395 {
1396 acpi_status status;
1397 struct acpi_table_ecdt *ecdt_ptr;
1398
1399 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1400 (struct acpi_table_header **)
1401 &ecdt_ptr);
1402 if (ACPI_FAILURE(status))
1403 return -ENODEV;
1404
1405 printk(KERN_INFO PREFIX "Found ECDT\n");
1406
1407 /*
1408 * Generate a temporary ec context to use until the namespace is scanned
1409 */
1410 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1411 if (!ec_ecdt)
1412 return -ENOMEM;
1413 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1414
1415 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1416 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1417 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1418 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1419 spin_lock_init(&ec_ecdt->poll.lock);
1420 /* use the GL just to be safe */
1421 ec_ecdt->common.global_lock = TRUE;
1422 ec_ecdt->common.uid = ecdt_ptr->uid;
1423
1424 status =
1425 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1426 if (ACPI_FAILURE(status)) {
1427 goto error;
1428 }
1429
1430 return 0;
1431 error:
1432 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1433 kfree(ec_ecdt);
1434 ec_ecdt = NULL;
1435
1436 return -ENODEV;
1437 }
1438
1439 static int __init acpi_ec_intr_get_real_ecdt(void)
1440 {
1441 acpi_status status;
1442 struct acpi_table_ecdt *ecdt_ptr;
1443
1444 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1445 (struct acpi_table_header **)
1446 &ecdt_ptr);
1447 if (ACPI_FAILURE(status))
1448 return -ENODEV;
1449
1450 printk(KERN_INFO PREFIX "Found ECDT\n");
1451
1452 /*
1453 * Generate a temporary ec context to use until the namespace is scanned
1454 */
1455 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1456 if (!ec_ecdt)
1457 return -ENOMEM;
1458 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1459
1460 init_MUTEX(&ec_ecdt->intr.sem);
1461 init_waitqueue_head(&ec_ecdt->intr.wait);
1462 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1463 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1464 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1465 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1466 /* use the GL just to be safe */
1467 ec_ecdt->common.global_lock = TRUE;
1468 ec_ecdt->common.uid = ecdt_ptr->uid;
1469
1470 status =
1471 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1472 if (ACPI_FAILURE(status)) {
1473 goto error;
1474 }
1475
1476 return 0;
1477 error:
1478 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1479 kfree(ec_ecdt);
1480 ec_ecdt = NULL;
1481
1482 return -ENODEV;
1483 }
1484
1485 static int __initdata acpi_fake_ecdt_enabled;
1486 int __init acpi_ec_ecdt_probe(void)
1487 {
1488 acpi_status status;
1489 int ret;
1490
1491 ret = acpi_ec_get_real_ecdt();
1492 /* Try to make a fake ECDT */
1493 if (ret && acpi_fake_ecdt_enabled) {
1494 ret = acpi_ec_fake_ecdt();
1495 }
1496
1497 if (ret)
1498 return 0;
1499
1500 /*
1501 * Install GPE handler
1502 */
1503 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1504 ACPI_GPE_EDGE_TRIGGERED,
1505 &acpi_ec_gpe_handler, ec_ecdt);
1506 if (ACPI_FAILURE(status)) {
1507 goto error;
1508 }
1509 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1510 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1511
1512 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1513 ACPI_ADR_SPACE_EC,
1514 &acpi_ec_space_handler,
1515 &acpi_ec_space_setup,
1516 ec_ecdt);
1517 if (ACPI_FAILURE(status)) {
1518 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1519 &acpi_ec_gpe_handler);
1520 goto error;
1521 }
1522
1523 return 0;
1524
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 __init acpi_ec_init(void)
1534 {
1535 int result = 0;
1536
1537 ACPI_FUNCTION_TRACE("acpi_ec_init");
1538
1539 if (acpi_disabled)
1540 return_VALUE(0);
1541
1542 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1543 if (!acpi_ec_dir)
1544 return_VALUE(-ENODEV);
1545
1546 /* Now register the driver for the EC */
1547 result = acpi_bus_register_driver(&acpi_ec_driver);
1548 if (result < 0) {
1549 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1550 return_VALUE(-ENODEV);
1551 }
1552
1553 return_VALUE(result);
1554 }
1555
1556 subsys_initcall(acpi_ec_init);
1557
1558 /* EC driver currently not unloadable */
1559 #if 0
1560 static void __exit acpi_ec_exit(void)
1561 {
1562 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1563
1564 acpi_bus_unregister_driver(&acpi_ec_driver);
1565
1566 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1567
1568 return_VOID;
1569 }
1570 #endif /* 0 */
1571
1572 static int __init acpi_fake_ecdt_setup(char *str)
1573 {
1574 acpi_fake_ecdt_enabled = 1;
1575 return 1;
1576 }
1577
1578 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1579 static int __init acpi_ec_set_intr_mode(char *str)
1580 {
1581 int intr;
1582
1583 if (!get_option(&str, &intr))
1584 return 0;
1585
1586 if (intr) {
1587 acpi_ec_poll_mode = EC_INTR;
1588 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1589 } else {
1590 acpi_ec_poll_mode = EC_POLL;
1591 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1592 }
1593 printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1594 return 1;
1595 }
1596
1597 __setup("ec_intr=", acpi_ec_set_intr_mode);
Linux with added FPC-III support