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code style scripts/checkpatch.pl formatting round #4 (2.6.34.14)
[linux-2.6.34.14-moxart.git] / drivers / acpi / ec.c
blob315368e1e1fcf2371cca3d966d29836548b82046
1 /*
2 * ec.c - ACPI Embedded Controller Driver (v2.1)
3 *
4 * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
6 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
29 /* Uncomment next line to get verbose printout */
30 /* #define DEBUG */
31
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/types.h>
36 #include <linux/delay.h>
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <linux/interrupt.h>
40 #include <linux/list.h>
41 #include <linux/spinlock.h>
42 #include <linux/slab.h>
43 #include <asm/io.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46 #include <linux/dmi.h>
47
48 #define ACPI_EC_CLASS "embedded_controller"
49 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
50 #define ACPI_EC_FILE_INFO "info"
51
52 #define PREFIX "ACPI: EC: "
53
54 /* EC status register */
55 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
56 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
57 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
58 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
59
60 /* EC commands */
61 enum ec_command {
62 ACPI_EC_COMMAND_READ = 0x80,
63 ACPI_EC_COMMAND_WRITE = 0x81,
64 ACPI_EC_BURST_ENABLE = 0x82,
65 ACPI_EC_BURST_DISABLE = 0x83,
66 ACPI_EC_COMMAND_QUERY = 0x84,
67 };
68
69 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
70 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
71 #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */
72 #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
73
74 #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
75 per one transaction */
76
77 enum {
78 EC_FLAGS_QUERY_PENDING, /* Query is pending */
79 EC_FLAGS_GPE_STORM, /* GPE storm detected */
80 EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
81 * OpReg are installed */
82 EC_FLAGS_FROZEN, /* Transactions are suspended */
83 };
84
85 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
86 /* External interfaces use first EC only, so remember */
87 typedef int (*acpi_ec_query_func) (void *data);
88
89 struct acpi_ec_query_handler {
90 struct list_head node;
91 acpi_ec_query_func func;
92 acpi_handle handle;
93 void *data;
94 u8 query_bit;
95 };
96
97 struct transaction {
98 const u8 *wdata;
99 u8 *rdata;
100 unsigned short irq_count;
101 u8 command;
102 u8 wi;
103 u8 ri;
104 u8 wlen;
105 u8 rlen;
106 bool done;
107 };
108
109 static struct acpi_ec {
110 acpi_handle handle;
111 unsigned long gpe;
112 unsigned long command_addr;
113 unsigned long data_addr;
114 unsigned long global_lock;
115 unsigned long flags;
116 struct mutex lock;
117 wait_queue_head_t wait;
118 struct list_head list;
119 struct transaction *curr;
120 spinlock_t curr_lock;
121 } *boot_ec, *first_ec;
122
123 static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
124 static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
125 static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
126
127 /* --------------------------------------------------------------------------
128 Transaction Management
129 -------------------------------------------------------------------------- */
130
131 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
132 {
133 u8 x = inb(ec->command_addr);
134 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
135 return x;
136 }
137
138 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
139 {
140 u8 x = inb(ec->data_addr);
141 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
142 return x;
143 }
144
145 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
146 {
147 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
148 outb(command, ec->command_addr);
149 }
150
151 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
152 {
153 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
154 outb(data, ec->data_addr);
155 }
156
157 static int ec_transaction_done(struct acpi_ec *ec)
158 {
159 unsigned long flags;
160 int ret = 0;
161 spin_lock_irqsave(&ec->curr_lock, flags);
162 if (!ec->curr || ec->curr->done)
163 ret = 1;
164 spin_unlock_irqrestore(&ec->curr_lock, flags);
165 return ret;
166 }
167
168 static void start_transaction(struct acpi_ec *ec)
169 {
170 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
171 ec->curr->done = false;
172 acpi_ec_write_cmd(ec, ec->curr->command);
173 }
174
175 static void advance_transaction(struct acpi_ec *ec, u8 status)
176 {
177 unsigned long flags;
178 spin_lock_irqsave(&ec->curr_lock, flags);
179 if (!ec->curr)
180 goto unlock;
181 if (ec->curr->wlen > ec->curr->wi) {
182 if ((status & ACPI_EC_FLAG_IBF) == 0)
183 acpi_ec_write_data(ec,
184 ec->curr->wdata[ec->curr->wi++]);
185 else
186 goto err;
187 } else if (ec->curr->rlen > ec->curr->ri) {
188 if ((status & ACPI_EC_FLAG_OBF) == 1) {
189 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
190 if (ec->curr->rlen == ec->curr->ri)
191 ec->curr->done = true;
192 } else
193 goto err;
194 } else if (ec->curr->wlen == ec->curr->wi &&
195 (status & ACPI_EC_FLAG_IBF) == 0)
196 ec->curr->done = true;
197 goto unlock;
198 err:
199 /* false interrupt, state didn't change */
200 if (in_interrupt())
201 ++ec->curr->irq_count;
202 unlock:
203 spin_unlock_irqrestore(&ec->curr_lock, flags);
204 }
205
206 static int acpi_ec_sync_query(struct acpi_ec *ec);
207
208 static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
209 {
210 if (state & ACPI_EC_FLAG_SCI) {
211 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
212 return acpi_ec_sync_query(ec);
213 }
214 return 0;
215 }
216
217 static int ec_poll(struct acpi_ec *ec)
218 {
219 unsigned long flags;
220 int repeat = 2; /* number of command restarts */
221 while (repeat--) {
222 unsigned long delay = jiffies +
223 msecs_to_jiffies(ACPI_EC_DELAY);
224 do {
225 /* don't sleep with disabled interrupts */
226 if (EC_FLAGS_MSI || irqs_disabled()) {
227 udelay(ACPI_EC_MSI_UDELAY);
228 if (ec_transaction_done(ec))
229 return 0;
230 } else {
231 if (wait_event_timeout(ec->wait,
232 ec_transaction_done(ec),
233 msecs_to_jiffies(1)))
234 return 0;
235 }
236 advance_transaction(ec, acpi_ec_read_status(ec));
237 } while (time_before(jiffies, delay));
238 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
239 break;
240 pr_debug(PREFIX "controller reset, restart transaction\n");
241 spin_lock_irqsave(&ec->curr_lock, flags);
242 start_transaction(ec);
243 spin_unlock_irqrestore(&ec->curr_lock, flags);
244 }
245 return -ETIME;
246 }
247
248 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
249 struct transaction *t)
250 {
251 unsigned long tmp;
252 int ret = 0;
253 if (EC_FLAGS_MSI)
254 udelay(ACPI_EC_MSI_UDELAY);
255 /* start transaction */
256 spin_lock_irqsave(&ec->curr_lock, tmp);
257 /* following two actions should be kept atomic */
258 ec->curr = t;
259 start_transaction(ec);
260 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
261 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
262 spin_unlock_irqrestore(&ec->curr_lock, tmp);
263 ret = ec_poll(ec);
264 spin_lock_irqsave(&ec->curr_lock, tmp);
265 ec->curr = NULL;
266 spin_unlock_irqrestore(&ec->curr_lock, tmp);
267 return ret;
268 }
269
270 static int ec_check_ibf0(struct acpi_ec *ec)
271 {
272 u8 status = acpi_ec_read_status(ec);
273 return (status & ACPI_EC_FLAG_IBF) == 0;
274 }
275
276 static int ec_wait_ibf0(struct acpi_ec *ec)
277 {
278 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
279 /* interrupt wait manually if GPE mode is not active */
280 while (time_before(jiffies, delay))
281 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
282 msecs_to_jiffies(1)))
283 return 0;
284 return -ETIME;
285 }
286
287 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
288 {
289 int status;
290 u32 glk;
291 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
292 return -EINVAL;
293 if (t->rdata)
294 memset(t->rdata, 0, t->rlen);
295 mutex_lock(&ec->lock);
296 if (test_bit(EC_FLAGS_FROZEN, &ec->flags)) {
297 status = -EINVAL;
298 goto unlock;
299 }
300 if (ec->global_lock) {
301 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
302 if (ACPI_FAILURE(status)) {
303 status = -ENODEV;
304 goto unlock;
305 }
306 }
307 if (ec_wait_ibf0(ec)) {
308 pr_err(PREFIX "input buffer is not empty, "
309 "aborting transaction\n");
310 status = -ETIME;
311 goto end;
312 }
313 pr_debug(PREFIX "transaction start\n");
314 /* disable GPE during transaction if storm is detected */
315 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
316 /*
317 * It has to be disabled at the hardware level regardless of the
318 * GPE reference counting, so that it doesn't trigger.
319 */
320 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
321 }
322
323 status = acpi_ec_transaction_unlocked(ec, t);
324
325 /* check if we received SCI during transaction */
326 ec_check_sci_sync(ec, acpi_ec_read_status(ec));
327 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
328 msleep(1);
329 /*
330 * It is safe to enable the GPE outside of the transaction. Use
331 * acpi_set_gpe() for that, since we used it to disable the GPE
332 * above.
333 */
334 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
335 } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
336 pr_info(PREFIX "GPE storm detected, "
337 "transactions will use polling mode\n");
338 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
339 }
340 pr_debug(PREFIX "transaction end\n");
341 end:
342 if (ec->global_lock)
343 acpi_release_global_lock(glk);
344 unlock:
345 mutex_unlock(&ec->lock);
346 return status;
347 }
348
349 static int acpi_ec_burst_enable(struct acpi_ec *ec)
350 {
351 u8 d;
352 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
353 .wdata = NULL, .rdata = &d,
354 .wlen = 0, .rlen = 1};
355
356 return acpi_ec_transaction(ec, &t);
357 }
358
359 static int acpi_ec_burst_disable(struct acpi_ec *ec)
360 {
361 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
362 .wdata = NULL, .rdata = NULL,
363 .wlen = 0, .rlen = 0};
364
365 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
366 acpi_ec_transaction(ec, &t) : 0;
367 }
368
369 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
370 {
371 int result;
372 u8 d;
373 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
374 .wdata = &address, .rdata = &d,
375 .wlen = 1, .rlen = 1};
376
377 result = acpi_ec_transaction(ec, &t);
378 *data = d;
379 return result;
380 }
381
382 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
383 {
384 u8 wdata[2] = { address, data };
385 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
386 .wdata = wdata, .rdata = NULL,
387 .wlen = 2, .rlen = 0};
388
389 return acpi_ec_transaction(ec, &t);
390 }
391
392 /*
393 * Externally callable EC access functions. For now, assume 1 EC only
394 */
395 int ec_burst_enable(void)
396 {
397 if (!first_ec)
398 return -ENODEV;
399 return acpi_ec_burst_enable(first_ec);
400 }
401
402 EXPORT_SYMBOL(ec_burst_enable);
403
404 int ec_burst_disable(void)
405 {
406 if (!first_ec)
407 return -ENODEV;
408 return acpi_ec_burst_disable(first_ec);
409 }
410
411 EXPORT_SYMBOL(ec_burst_disable);
412
413 int ec_read(u8 addr, u8 * val)
414 {
415 int err;
416 u8 temp_data;
417
418 if (!first_ec)
419 return -ENODEV;
420
421 err = acpi_ec_read(first_ec, addr, &temp_data);
422
423 if (!err) {
424 *val = temp_data;
425 return 0;
426 } else
427 return err;
428 }
429
430 EXPORT_SYMBOL(ec_read);
431
432 int ec_write(u8 addr, u8 val)
433 {
434 int err;
435
436 if (!first_ec)
437 return -ENODEV;
438
439 err = acpi_ec_write(first_ec, addr, val);
440
441 return err;
442 }
443
444 EXPORT_SYMBOL(ec_write);
445
446 int ec_transaction(u8 command,
447 const u8 * wdata, unsigned wdata_len,
448 u8 * rdata, unsigned rdata_len,
449 int force_poll)
450 {
451 struct transaction t = {.command = command,
452 .wdata = wdata, .rdata = rdata,
453 .wlen = wdata_len, .rlen = rdata_len};
454 if (!first_ec)
455 return -ENODEV;
456
457 return acpi_ec_transaction(first_ec, &t);
458 }
459
460 EXPORT_SYMBOL(ec_transaction);
461
462 void acpi_ec_suspend_transactions(void)
463 {
464 struct acpi_ec *ec = first_ec;
465
466 if (!ec)
467 return;
468
469 mutex_lock(&ec->lock);
470 /* Prevent transactions from being carried out */
471 set_bit(EC_FLAGS_FROZEN, &ec->flags);
472 mutex_unlock(&ec->lock);
473 }
474
475 void acpi_ec_resume_transactions(void)
476 {
477 struct acpi_ec *ec = first_ec;
478
479 if (!ec)
480 return;
481
482 mutex_lock(&ec->lock);
483 /* Allow transactions to be carried out again */
484 clear_bit(EC_FLAGS_FROZEN, &ec->flags);
485 mutex_unlock(&ec->lock);
486 }
487
488 static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
489 {
490 int result;
491 u8 d;
492 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
493 .wdata = NULL, .rdata = &d,
494 .wlen = 0, .rlen = 1};
495 if (!ec || !data)
496 return -EINVAL;
497 /*
498 * Query the EC to find out which _Qxx method we need to evaluate.
499 * Note that successful completion of the query causes the ACPI_EC_SCI
500 * bit to be cleared (and thus clearing the interrupt source).
501 */
502 result = acpi_ec_transaction_unlocked(ec, &t);
503 if (result)
504 return result;
505 if (!d)
506 return -ENODATA;
507 *data = d;
508 return 0;
509 }
510
511 /* --------------------------------------------------------------------------
512 Event Management
513 -------------------------------------------------------------------------- */
514 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
515 acpi_handle handle, acpi_ec_query_func func,
516 void *data)
517 {
518 struct acpi_ec_query_handler *handler =
519 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
520 if (!handler)
521 return -ENOMEM;
522
523 handler->query_bit = query_bit;
524 handler->handle = handle;
525 handler->func = func;
526 handler->data = data;
527 mutex_lock(&ec->lock);
528 list_add(&handler->node, &ec->list);
529 mutex_unlock(&ec->lock);
530 return 0;
531 }
532
533 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
534
535 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
536 {
537 struct acpi_ec_query_handler *handler, *tmp;
538 mutex_lock(&ec->lock);
539 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
540 if (query_bit == handler->query_bit) {
541 list_del(&handler->node);
542 kfree(handler);
543 }
544 }
545 mutex_unlock(&ec->lock);
546 }
547
548 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
549
550 static void acpi_ec_run(void *cxt)
551 {
552 struct acpi_ec_query_handler *handler = cxt;
553 if (!handler)
554 return;
555 pr_debug(PREFIX "start query execution\n");
556 if (handler->func)
557 handler->func(handler->data);
558 else if (handler->handle)
559 acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
560 pr_debug(PREFIX "stop query execution\n");
561 kfree(handler);
562 }
563
564 static int acpi_ec_sync_query(struct acpi_ec *ec)
565 {
566 u8 value = 0;
567 int status;
568 struct acpi_ec_query_handler *handler, *copy;
569 if ((status = acpi_ec_query_unlocked(ec, &value)))
570 return status;
571 list_for_each_entry(handler, &ec->list, node) {
572 if (value == handler->query_bit) {
573 /* have custom handler for this bit */
574 copy = kmalloc(sizeof(*handler), GFP_KERNEL);
575 if (!copy)
576 return -ENOMEM;
577 memcpy(copy, handler, sizeof(*copy));
578 pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value);
579 return acpi_os_execute((copy->func) ?
580 OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
581 acpi_ec_run, copy);
582 }
583 }
584 return 0;
585 }
586
587 static void acpi_ec_gpe_query(void *ec_cxt)
588 {
589 struct acpi_ec *ec = ec_cxt;
590 if (!ec)
591 return;
592 mutex_lock(&ec->lock);
593 acpi_ec_sync_query(ec);
594 mutex_unlock(&ec->lock);
595 }
596
597 static void acpi_ec_gpe_query(void *ec_cxt);
598
599 static int ec_check_sci(struct acpi_ec *ec, u8 state)
600 {
601 if (state & ACPI_EC_FLAG_SCI) {
602 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
603 pr_debug(PREFIX "push gpe query to the queue\n");
604 return acpi_os_execute(OSL_NOTIFY_HANDLER,
605 acpi_ec_gpe_query, ec);
606 }
607 }
608 return 0;
609 }
610
611 static u32 acpi_ec_gpe_handler(void *data)
612 {
613 struct acpi_ec *ec = data;
614
615 pr_debug(PREFIX "~~~> interrupt\n");
616
617 advance_transaction(ec, acpi_ec_read_status(ec));
618 if (ec_transaction_done(ec) &&
619 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
620 wake_up(&ec->wait);
621 ec_check_sci(ec, acpi_ec_read_status(ec));
622 }
623 return ACPI_INTERRUPT_HANDLED;
624 }
625
626 /* --------------------------------------------------------------------------
627 Address Space Management
628 -------------------------------------------------------------------------- */
629
630 static acpi_status
631 acpi_ec_space_handler(u32 function, acpi_physical_address address,
632 u32 bits, u64 *value64,
633 void *handler_context, void *region_context)
634 {
635 struct acpi_ec *ec = handler_context;
636 int result = 0, i, bytes = bits / 8;
637 u8 *value = (u8 *)value64;
638
639 if ((address > 0xFF) || !value || !handler_context)
640 return AE_BAD_PARAMETER;
641
642 if (function != ACPI_READ && function != ACPI_WRITE)
643 return AE_BAD_PARAMETER;
644
645 if (EC_FLAGS_MSI || bits > 8)
646 acpi_ec_burst_enable(ec);
647
648 for (i = 0; i < bytes; ++i, ++address, ++value)
649 result = (function == ACPI_READ) ?
650 acpi_ec_read(ec, address, value) :
651 acpi_ec_write(ec, address, *value);
652
653 if (EC_FLAGS_MSI || bits > 8)
654 acpi_ec_burst_disable(ec);
655
656 switch (result) {
657 case -EINVAL:
658 return AE_BAD_PARAMETER;
659 break;
660 case -ENODEV:
661 return AE_NOT_FOUND;
662 break;
663 case -ETIME:
664 return AE_TIME;
665 break;
666 default:
667 return AE_OK;
668 }
669 }
670
671 /* --------------------------------------------------------------------------
672 FS Interface (/proc)
673 -------------------------------------------------------------------------- */
674
675 static struct proc_dir_entry *acpi_ec_dir;
676
677 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
678 {
679 struct acpi_ec *ec = seq->private;
680
681 if (!ec)
682 goto end;
683
684 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
685 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
686 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
687 seq_printf(seq, "use global lock:\t%s\n",
688 ec->global_lock ? "yes" : "no");
689 end:
690 return 0;
691 }
692
693 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
694 {
695 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
696 }
697
698 static const struct file_operations acpi_ec_info_ops = {
699 .open = acpi_ec_info_open_fs,
700 .read = seq_read,
701 .llseek = seq_lseek,
702 .release = single_release,
703 .owner = THIS_MODULE,
704 };
705
706 static int acpi_ec_add_fs(struct acpi_device *device)
707 {
708 struct proc_dir_entry *entry = NULL;
709
710 if (!acpi_device_dir(device)) {
711 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
712 acpi_ec_dir);
713 if (!acpi_device_dir(device))
714 return -ENODEV;
715 }
716
717 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
718 acpi_device_dir(device),
719 &acpi_ec_info_ops, acpi_driver_data(device));
720 if (!entry)
721 return -ENODEV;
722 return 0;
723 }
724
725 static int acpi_ec_remove_fs(struct acpi_device *device)
726 {
727
728 if (acpi_device_dir(device)) {
729 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
730 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
731 acpi_device_dir(device) = NULL;
732 }
733
734 return 0;
735 }
736
737 /* --------------------------------------------------------------------------
738 Driver Interface
739 -------------------------------------------------------------------------- */
740 static acpi_status
741 ec_parse_io_ports(struct acpi_resource *resource, void *context);
742
743 static struct acpi_ec *make_acpi_ec(void)
744 {
745 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
746 if (!ec)
747 return NULL;
748 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
749 mutex_init(&ec->lock);
750 init_waitqueue_head(&ec->wait);
751 INIT_LIST_HEAD(&ec->list);
752 spin_lock_init(&ec->curr_lock);
753 return ec;
754 }
755
756 static acpi_status
757 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
758 void *context, void **return_value)
759 {
760 char node_name[5];
761 struct acpi_buffer buffer = { sizeof(node_name), node_name };
762 struct acpi_ec *ec = context;
763 int value = 0;
764 acpi_status status;
765
766 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
767
768 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
769 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
770 }
771 return AE_OK;
772 }
773
774 static acpi_status
775 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
776 {
777 acpi_status status;
778 unsigned long long tmp = 0;
779
780 struct acpi_ec *ec = context;
781
782 /* clear addr values, ec_parse_io_ports depend on it */
783 ec->command_addr = ec->data_addr = 0;
784
785 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
786 ec_parse_io_ports, ec);
787 if (ACPI_FAILURE(status))
788 return status;
789
790 /* Get GPE bit assignment (EC events). */
791 /* TODO: Add support for _GPE returning a package */
792 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
793 if (ACPI_FAILURE(status))
794 return status;
795 ec->gpe = tmp;
796 /* Use the global lock for all EC transactions? */
797 tmp = 0;
798 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
799 ec->global_lock = tmp;
800 ec->handle = handle;
801 return AE_CTRL_TERMINATE;
802 }
803
804 static int ec_install_handlers(struct acpi_ec *ec)
805 {
806 acpi_status status;
807 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
808 return 0;
809 status = acpi_install_gpe_handler(NULL, ec->gpe,
810 ACPI_GPE_EDGE_TRIGGERED,
811 &acpi_ec_gpe_handler, ec);
812 if (ACPI_FAILURE(status))
813 return -ENODEV;
814
815 acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
816 status = acpi_install_address_space_handler(ec->handle,
817 ACPI_ADR_SPACE_EC,
818 &acpi_ec_space_handler,
819 NULL, ec);
820 if (ACPI_FAILURE(status)) {
821 if (status == AE_NOT_FOUND) {
822 /*
823 * Maybe OS fails in evaluating the _REG object.
824 * The AE_NOT_FOUND error will be ignored and OS
825 * continue to initialize EC.
826 */
827 printk(KERN_ERR "Fail in evaluating the _REG object"
828 " of EC device. Broken bios is suspected.\n");
829 } else {
830 acpi_remove_gpe_handler(NULL, ec->gpe,
831 &acpi_ec_gpe_handler);
832 acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
833 return -ENODEV;
834 }
835 }
836
837 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
838 return 0;
839 }
840
841 static void ec_remove_handlers(struct acpi_ec *ec)
842 {
843 acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
844 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
845 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
846 pr_err(PREFIX "failed to remove space handler\n");
847 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
848 &acpi_ec_gpe_handler)))
849 pr_err(PREFIX "failed to remove gpe handler\n");
850 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
851 }
852
853 static int acpi_ec_add(struct acpi_device *device)
854 {
855 struct acpi_ec *ec = NULL;
856 int ret;
857
858 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
859 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
860
861 /* Check for boot EC */
862 if (boot_ec &&
863 (boot_ec->handle == device->handle ||
864 boot_ec->handle == ACPI_ROOT_OBJECT)) {
865 ec = boot_ec;
866 boot_ec = NULL;
867 } else {
868 ec = make_acpi_ec();
869 if (!ec)
870 return -ENOMEM;
871 }
872 if (ec_parse_device(device->handle, 0, ec, NULL) !=
873 AE_CTRL_TERMINATE) {
874 kfree(ec);
875 return -EINVAL;
876 }
877
878 ec->handle = device->handle;
879
880 /* Find and register all query methods */
881 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
882 acpi_ec_register_query_methods, NULL, ec, NULL);
883
884 if (!first_ec)
885 first_ec = ec;
886 device->driver_data = ec;
887 acpi_ec_add_fs(device);
888 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
889 ec->gpe, ec->command_addr, ec->data_addr);
890
891 ret = ec_install_handlers(ec);
892
893 /* EC is fully operational, allow queries */
894 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
895 return ret;
896 }
897
898 static int acpi_ec_remove(struct acpi_device *device, int type)
899 {
900 struct acpi_ec *ec;
901 struct acpi_ec_query_handler *handler, *tmp;
902
903 if (!device)
904 return -EINVAL;
905
906 ec = acpi_driver_data(device);
907 ec_remove_handlers(ec);
908 mutex_lock(&ec->lock);
909 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
910 list_del(&handler->node);
911 kfree(handler);
912 }
913 mutex_unlock(&ec->lock);
914 acpi_ec_remove_fs(device);
915 device->driver_data = NULL;
916 if (ec == first_ec)
917 first_ec = NULL;
918 kfree(ec);
919 return 0;
920 }
921
922 static acpi_status
923 ec_parse_io_ports(struct acpi_resource *resource, void *context)
924 {
925 struct acpi_ec *ec = context;
926
927 if (resource->type != ACPI_RESOURCE_TYPE_IO)
928 return AE_OK;
929
930 /*
931 * The first address region returned is the data port, and
932 * the second address region returned is the status/command
933 * port.
934 */
935 if (ec->data_addr == 0)
936 ec->data_addr = resource->data.io.minimum;
937 else if (ec->command_addr == 0)
938 ec->command_addr = resource->data.io.minimum;
939 else
940 return AE_CTRL_TERMINATE;
941
942 return AE_OK;
943 }
944
945 int __init acpi_boot_ec_enable(void)
946 {
947 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
948 return 0;
949 if (!ec_install_handlers(boot_ec)) {
950 first_ec = boot_ec;
951 return 0;
952 }
953 return -EFAULT;
954 }
955
956 static const struct acpi_device_id ec_device_ids[] = {
957 {"PNP0C09", 0},
958 {"", 0},
959 };
960
961 /* Some BIOS do not survive early DSDT scan, skip it */
962 static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
963 {
964 EC_FLAGS_SKIP_DSDT_SCAN = 1;
965 return 0;
966 }
967
968 /* ASUStek often supplies us with broken ECDT, validate it */
969 static int ec_validate_ecdt(const struct dmi_system_id *id)
970 {
971 EC_FLAGS_VALIDATE_ECDT = 1;
972 return 0;
973 }
974
975 /* MSI EC needs special treatment, enable it */
976 static int ec_flag_msi(const struct dmi_system_id *id)
977 {
978 printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n");
979 EC_FLAGS_MSI = 1;
980 EC_FLAGS_VALIDATE_ECDT = 1;
981 return 0;
982 }
983
984 static struct dmi_system_id __initdata ec_dmi_table[] = {
985 {
986 ec_skip_dsdt_scan, "Compal JFL92", {
987 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
988 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
989 {
990 ec_flag_msi, "MSI hardware", {
991 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
992 {
993 ec_flag_msi, "MSI hardware", {
994 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
995 {
996 ec_flag_msi, "MSI hardware", {
997 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
998 {
999 ec_flag_msi, "MSI hardware", {
1000 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL},
1001 {
1002 ec_validate_ecdt, "ASUS hardware", {
1003 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
1004 {},
1005 };
1006
1007
1008 int __init acpi_ec_ecdt_probe(void)
1009 {
1010 acpi_status status;
1011 struct acpi_ec *saved_ec = NULL;
1012 struct acpi_table_ecdt *ecdt_ptr;
1013
1014 boot_ec = make_acpi_ec();
1015 if (!boot_ec)
1016 return -ENOMEM;
1017 /*
1018 * Generate a boot ec context
1019 */
1020 dmi_check_system(ec_dmi_table);
1021 status = acpi_get_table(ACPI_SIG_ECDT, 1,
1022 (struct acpi_table_header **)&ecdt_ptr);
1023 if (ACPI_SUCCESS(status)) {
1024 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
1025 boot_ec->command_addr = ecdt_ptr->control.address;
1026 boot_ec->data_addr = ecdt_ptr->data.address;
1027 boot_ec->gpe = ecdt_ptr->gpe;
1028 boot_ec->handle = ACPI_ROOT_OBJECT;
1029 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
1030 /* Don't trust ECDT, which comes from ASUSTek */
1031 if (!EC_FLAGS_VALIDATE_ECDT)
1032 goto install;
1033 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1034 if (!saved_ec)
1035 return -ENOMEM;
1036 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
1037 /* fall through */
1038 }
1039
1040 if (EC_FLAGS_SKIP_DSDT_SCAN)
1041 return -ENODEV;
1042
1043 /* This workaround is needed only on some broken machines,
1044 * which require early EC, but fail to provide ECDT */
1045 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
1046 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1047 boot_ec, NULL);
1048 /* Check that acpi_get_devices actually find something */
1049 if (ACPI_FAILURE(status) || !boot_ec->handle)
1050 goto error;
1051 if (saved_ec) {
1052 /* try to find good ECDT from ASUSTek */
1053 if (saved_ec->command_addr != boot_ec->command_addr ||
1054 saved_ec->data_addr != boot_ec->data_addr ||
1055 saved_ec->gpe != boot_ec->gpe ||
1056 saved_ec->handle != boot_ec->handle)
1057 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
1058 "ECDT tables, which are very hard to workaround. "
1059 "Trying to use DSDT EC info instead. Please send "
1060 "output of acpidump to linux-acpi@vger.kernel.org\n");
1061 kfree(saved_ec);
1062 saved_ec = NULL;
1063 } else {
1064 /* We really need to limit this workaround, the only ASUS,
1065 * which needs it, has fake EC._INI method, so use it as flag.
1066 * Keep boot_ec struct as it will be needed soon.
1067 */
1068 acpi_handle dummy;
1069 if (!dmi_name_in_vendors("ASUS") ||
1070 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1071 &dummy)))
1072 return -ENODEV;
1073 }
1074 install:
1075 if (!ec_install_handlers(boot_ec)) {
1076 first_ec = boot_ec;
1077 return 0;
1078 }
1079 error:
1080 kfree(boot_ec);
1081 boot_ec = NULL;
1082 return -ENODEV;
1083 }
1084
1085 static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1086 {
1087 struct acpi_ec *ec = acpi_driver_data(device);
1088 /* Stop using the GPE, but keep it reference counted. */
1089 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
1090 return 0;
1091 }
1092
1093 static int acpi_ec_resume(struct acpi_device *device)
1094 {
1095 struct acpi_ec *ec = acpi_driver_data(device);
1096 /* Enable the GPE again, but don't reference count it once more. */
1097 acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
1098 return 0;
1099 }
1100
1101 static struct acpi_driver acpi_ec_driver = {
1102 .name = "ec",
1103 .class = ACPI_EC_CLASS,
1104 .ids = ec_device_ids,
1105 .ops = {
1106 .add = acpi_ec_add,
1107 .remove = acpi_ec_remove,
1108 .suspend = acpi_ec_suspend,
1109 .resume = acpi_ec_resume,
1110 },
1111 };
1112
1113 int __init acpi_ec_init(void)
1114 {
1115 int result = 0;
1116
1117 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1118 if (!acpi_ec_dir)
1119 return -ENODEV;
1120
1121 /* Now register the driver for the EC */
1122 result = acpi_bus_register_driver(&acpi_ec_driver);
1123 if (result < 0) {
1124 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1125 return -ENODEV;
1126 }
1127
1128 return result;
1129 }
1130
1131 /* EC driver currently not unloadable */
1132 #if 0
1133 static void __exit acpi_ec_exit(void)
1134 {
1135
1136 acpi_bus_unregister_driver(&acpi_ec_driver);
1137
1138 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1139
1140 return;
1141 }
1142 #endif /* 0 */
Linux ARM platform port for MOXA ART SoC