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