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dm snapshot: implement iterate devices
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / ec.c
blob391f331674c74c812fddce14203073ceb083a2dd
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
46 #define ACPI_EC_CLASS "embedded_controller"
47 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
48 #define ACPI_EC_FILE_INFO "info"
49
50 #undef PREFIX
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
72 #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
73 per one transaction */
74
75 enum {
76 EC_FLAGS_QUERY_PENDING, /* Query is pending */
77 EC_FLAGS_GPE_MODE, /* Expect GPE to be sent
78 * for status change */
79 EC_FLAGS_NO_GPE, /* Don't use GPE mode */
80 EC_FLAGS_GPE_STORM, /* GPE storm detected */
81 EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
82 * OpReg are installed */
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
125 /* --------------------------------------------------------------------------
126 Transaction Management
127 -------------------------------------------------------------------------- */
128
129 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
130 {
131 u8 x = inb(ec->command_addr);
132 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
133 return x;
134 }
135
136 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
137 {
138 u8 x = inb(ec->data_addr);
139 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
140 return x;
141 }
142
143 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
144 {
145 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
146 outb(command, ec->command_addr);
147 }
148
149 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
150 {
151 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
152 outb(data, ec->data_addr);
153 }
154
155 static int ec_transaction_done(struct acpi_ec *ec)
156 {
157 unsigned long flags;
158 int ret = 0;
159 spin_lock_irqsave(&ec->curr_lock, flags);
160 if (!ec->curr || ec->curr->done)
161 ret = 1;
162 spin_unlock_irqrestore(&ec->curr_lock, flags);
163 return ret;
164 }
165
166 static void start_transaction(struct acpi_ec *ec)
167 {
168 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
169 ec->curr->done = false;
170 acpi_ec_write_cmd(ec, ec->curr->command);
171 }
172
173 static void gpe_transaction(struct acpi_ec *ec, u8 status)
174 {
175 unsigned long flags;
176 spin_lock_irqsave(&ec->curr_lock, flags);
177 if (!ec->curr)
178 goto unlock;
179 if (ec->curr->wlen > ec->curr->wi) {
180 if ((status & ACPI_EC_FLAG_IBF) == 0)
181 acpi_ec_write_data(ec,
182 ec->curr->wdata[ec->curr->wi++]);
183 else
184 goto err;
185 } else if (ec->curr->rlen > ec->curr->ri) {
186 if ((status & ACPI_EC_FLAG_OBF) == 1) {
187 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
188 if (ec->curr->rlen == ec->curr->ri)
189 ec->curr->done = true;
190 } else
191 goto err;
192 } else if (ec->curr->wlen == ec->curr->wi &&
193 (status & ACPI_EC_FLAG_IBF) == 0)
194 ec->curr->done = true;
195 goto unlock;
196 err:
197 /* false interrupt, state didn't change */
198 if (in_interrupt())
199 ++ec->curr->irq_count;
200 unlock:
201 spin_unlock_irqrestore(&ec->curr_lock, flags);
202 }
203
204 static int acpi_ec_wait(struct acpi_ec *ec)
205 {
206 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
207 msecs_to_jiffies(ACPI_EC_DELAY)))
208 return 0;
209 /* try restart command if we get any false interrupts */
210 if (ec->curr->irq_count &&
211 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
212 pr_debug(PREFIX "controller reset, restart transaction\n");
213 start_transaction(ec);
214 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
215 msecs_to_jiffies(ACPI_EC_DELAY)))
216 return 0;
217 }
218 /* missing GPEs, switch back to poll mode */
219 if (printk_ratelimit())
220 pr_info(PREFIX "missing confirmations, "
221 "switch off interrupt mode.\n");
222 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
223 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
224 return 1;
225 }
226
227 static void acpi_ec_gpe_query(void *ec_cxt);
228
229 static int ec_check_sci(struct acpi_ec *ec, u8 state)
230 {
231 if (state & ACPI_EC_FLAG_SCI) {
232 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
233 return acpi_os_execute(OSL_EC_BURST_HANDLER,
234 acpi_ec_gpe_query, ec);
235 }
236 return 0;
237 }
238
239 static void ec_delay(void)
240 {
241 /* EC in MSI notebooks don't tolerate delays other than 550 usec */
242 if (EC_FLAGS_MSI)
243 udelay(ACPI_EC_DELAY);
244 else
245 /* Use shortest sleep available */
246 msleep(1);
247 }
248
249 static int ec_poll(struct acpi_ec *ec)
250 {
251 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
252 udelay(ACPI_EC_CDELAY);
253 while (time_before(jiffies, delay)) {
254 gpe_transaction(ec, acpi_ec_read_status(ec));
255 ec_delay();
256 if (ec_transaction_done(ec))
257 return 0;
258 }
259 return -ETIME;
260 }
261
262 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
263 struct transaction *t,
264 int force_poll)
265 {
266 unsigned long tmp;
267 int ret = 0;
268 pr_debug(PREFIX "transaction start\n");
269 /* disable GPE during transaction if storm is detected */
270 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
271 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
272 acpi_disable_gpe(NULL, ec->gpe);
273 }
274 if (EC_FLAGS_MSI)
275 udelay(ACPI_EC_DELAY);
276 /* start transaction */
277 spin_lock_irqsave(&ec->curr_lock, tmp);
278 /* following two actions should be kept atomic */
279 ec->curr = t;
280 start_transaction(ec);
281 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
282 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
283 spin_unlock_irqrestore(&ec->curr_lock, tmp);
284 /* if we selected poll mode or failed in GPE-mode do a poll loop */
285 if (force_poll ||
286 !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
287 acpi_ec_wait(ec))
288 ret = ec_poll(ec);
289 pr_debug(PREFIX "transaction end\n");
290 spin_lock_irqsave(&ec->curr_lock, tmp);
291 ec->curr = NULL;
292 spin_unlock_irqrestore(&ec->curr_lock, tmp);
293 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
294 /* check if we received SCI during transaction */
295 ec_check_sci(ec, acpi_ec_read_status(ec));
296 /* it is safe to enable GPE outside of transaction */
297 acpi_enable_gpe(NULL, ec->gpe);
298 } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
299 t->irq_count > ACPI_EC_STORM_THRESHOLD) {
300 pr_info(PREFIX "GPE storm detected, "
301 "transactions will use polling mode\n");
302 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
303 }
304 return ret;
305 }
306
307 static int ec_check_ibf0(struct acpi_ec *ec)
308 {
309 u8 status = acpi_ec_read_status(ec);
310 return (status & ACPI_EC_FLAG_IBF) == 0;
311 }
312
313 static int ec_wait_ibf0(struct acpi_ec *ec)
314 {
315 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
316 /* interrupt wait manually if GPE mode is not active */
317 unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ?
318 msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1);
319 while (time_before(jiffies, delay))
320 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout))
321 return 0;
322 return -ETIME;
323 }
324
325 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
326 int force_poll)
327 {
328 int status;
329 u32 glk;
330 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
331 return -EINVAL;
332 if (t->rdata)
333 memset(t->rdata, 0, t->rlen);
334 mutex_lock(&ec->lock);
335 if (ec->global_lock) {
336 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
337 if (ACPI_FAILURE(status)) {
338 status = -ENODEV;
339 goto unlock;
340 }
341 }
342 if (ec_wait_ibf0(ec)) {
343 pr_err(PREFIX "input buffer is not empty, "
344 "aborting transaction\n");
345 status = -ETIME;
346 goto end;
347 }
348 status = acpi_ec_transaction_unlocked(ec, t, force_poll);
349 end:
350 if (ec->global_lock)
351 acpi_release_global_lock(glk);
352 unlock:
353 mutex_unlock(&ec->lock);
354 return status;
355 }
356
357 /*
358 * Note: samsung nv5000 doesn't work with ec burst mode.
359 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
360 */
361 static int acpi_ec_burst_enable(struct acpi_ec *ec)
362 {
363 u8 d;
364 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
365 .wdata = NULL, .rdata = &d,
366 .wlen = 0, .rlen = 1};
367
368 return acpi_ec_transaction(ec, &t, 0);
369 }
370
371 static int acpi_ec_burst_disable(struct acpi_ec *ec)
372 {
373 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
374 .wdata = NULL, .rdata = NULL,
375 .wlen = 0, .rlen = 0};
376
377 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
378 acpi_ec_transaction(ec, &t, 0) : 0;
379 }
380
381 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
382 {
383 int result;
384 u8 d;
385 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
386 .wdata = &address, .rdata = &d,
387 .wlen = 1, .rlen = 1};
388
389 result = acpi_ec_transaction(ec, &t, 0);
390 *data = d;
391 return result;
392 }
393
394 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
395 {
396 u8 wdata[2] = { address, data };
397 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
398 .wdata = wdata, .rdata = NULL,
399 .wlen = 2, .rlen = 0};
400
401 return acpi_ec_transaction(ec, &t, 0);
402 }
403
404 /*
405 * Externally callable EC access functions. For now, assume 1 EC only
406 */
407 int ec_burst_enable(void)
408 {
409 if (!first_ec)
410 return -ENODEV;
411 return acpi_ec_burst_enable(first_ec);
412 }
413
414 EXPORT_SYMBOL(ec_burst_enable);
415
416 int ec_burst_disable(void)
417 {
418 if (!first_ec)
419 return -ENODEV;
420 return acpi_ec_burst_disable(first_ec);
421 }
422
423 EXPORT_SYMBOL(ec_burst_disable);
424
425 int ec_read(u8 addr, u8 * val)
426 {
427 int err;
428 u8 temp_data;
429
430 if (!first_ec)
431 return -ENODEV;
432
433 err = acpi_ec_read(first_ec, addr, &temp_data);
434
435 if (!err) {
436 *val = temp_data;
437 return 0;
438 } else
439 return err;
440 }
441
442 EXPORT_SYMBOL(ec_read);
443
444 int ec_write(u8 addr, u8 val)
445 {
446 int err;
447
448 if (!first_ec)
449 return -ENODEV;
450
451 err = acpi_ec_write(first_ec, addr, val);
452
453 return err;
454 }
455
456 EXPORT_SYMBOL(ec_write);
457
458 int ec_transaction(u8 command,
459 const u8 * wdata, unsigned wdata_len,
460 u8 * rdata, unsigned rdata_len,
461 int force_poll)
462 {
463 struct transaction t = {.command = command,
464 .wdata = wdata, .rdata = rdata,
465 .wlen = wdata_len, .rlen = rdata_len};
466 if (!first_ec)
467 return -ENODEV;
468
469 return acpi_ec_transaction(first_ec, &t, force_poll);
470 }
471
472 EXPORT_SYMBOL(ec_transaction);
473
474 static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
475 {
476 int result;
477 u8 d;
478 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
479 .wdata = NULL, .rdata = &d,
480 .wlen = 0, .rlen = 1};
481 if (!ec || !data)
482 return -EINVAL;
483
484 /*
485 * Query the EC to find out which _Qxx method we need to evaluate.
486 * Note that successful completion of the query causes the ACPI_EC_SCI
487 * bit to be cleared (and thus clearing the interrupt source).
488 */
489
490 result = acpi_ec_transaction(ec, &t, 0);
491 if (result)
492 return result;
493
494 if (!d)
495 return -ENODATA;
496
497 *data = d;
498 return 0;
499 }
500
501 /* --------------------------------------------------------------------------
502 Event Management
503 -------------------------------------------------------------------------- */
504 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
505 acpi_handle handle, acpi_ec_query_func func,
506 void *data)
507 {
508 struct acpi_ec_query_handler *handler =
509 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
510 if (!handler)
511 return -ENOMEM;
512
513 handler->query_bit = query_bit;
514 handler->handle = handle;
515 handler->func = func;
516 handler->data = data;
517 mutex_lock(&ec->lock);
518 list_add(&handler->node, &ec->list);
519 mutex_unlock(&ec->lock);
520 return 0;
521 }
522
523 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
524
525 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
526 {
527 struct acpi_ec_query_handler *handler, *tmp;
528 mutex_lock(&ec->lock);
529 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
530 if (query_bit == handler->query_bit) {
531 list_del(&handler->node);
532 kfree(handler);
533 }
534 }
535 mutex_unlock(&ec->lock);
536 }
537
538 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
539
540 static void acpi_ec_gpe_query(void *ec_cxt)
541 {
542 struct acpi_ec *ec = ec_cxt;
543 u8 value = 0;
544 struct acpi_ec_query_handler *handler, copy;
545
546 if (!ec || acpi_ec_query(ec, &value))
547 return;
548 mutex_lock(&ec->lock);
549 list_for_each_entry(handler, &ec->list, node) {
550 if (value == handler->query_bit) {
551 /* have custom handler for this bit */
552 memcpy(&copy, handler, sizeof(copy));
553 mutex_unlock(&ec->lock);
554 if (copy.func) {
555 copy.func(copy.data);
556 } else if (copy.handle) {
557 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
558 }
559 return;
560 }
561 }
562 mutex_unlock(&ec->lock);
563 }
564
565 static u32 acpi_ec_gpe_handler(void *data)
566 {
567 struct acpi_ec *ec = data;
568 u8 status;
569
570 pr_debug(PREFIX "~~~> interrupt\n");
571 status = acpi_ec_read_status(ec);
572
573 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) {
574 gpe_transaction(ec, status);
575 if (ec_transaction_done(ec) &&
576 (status & ACPI_EC_FLAG_IBF) == 0)
577 wake_up(&ec->wait);
578 }
579
580 ec_check_sci(ec, status);
581 if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
582 !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
583 /* this is non-query, must be confirmation */
584 if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
585 if (printk_ratelimit())
586 pr_info(PREFIX "non-query interrupt received,"
587 " switching to interrupt mode\n");
588 } else {
589 /* hush, STORM switches the mode every transaction */
590 pr_debug(PREFIX "non-query interrupt received,"
591 " switching to interrupt mode\n");
592 }
593 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
594 }
595 return ACPI_INTERRUPT_HANDLED;
596 }
597
598 /* --------------------------------------------------------------------------
599 Address Space Management
600 -------------------------------------------------------------------------- */
601
602 static acpi_status
603 acpi_ec_space_handler(u32 function, acpi_physical_address address,
604 u32 bits, acpi_integer *value,
605 void *handler_context, void *region_context)
606 {
607 struct acpi_ec *ec = handler_context;
608 int result = 0, i;
609 u8 temp = 0;
610
611 if ((address > 0xFF) || !value || !handler_context)
612 return AE_BAD_PARAMETER;
613
614 if (function != ACPI_READ && function != ACPI_WRITE)
615 return AE_BAD_PARAMETER;
616
617 if (bits != 8 && acpi_strict)
618 return AE_BAD_PARAMETER;
619
620 acpi_ec_burst_enable(ec);
621
622 if (function == ACPI_READ) {
623 result = acpi_ec_read(ec, address, &temp);
624 *value = temp;
625 } else {
626 temp = 0xff & (*value);
627 result = acpi_ec_write(ec, address, temp);
628 }
629
630 for (i = 8; unlikely(bits - i > 0); i += 8) {
631 ++address;
632 if (function == ACPI_READ) {
633 result = acpi_ec_read(ec, address, &temp);
634 (*value) |= ((acpi_integer)temp) << i;
635 } else {
636 temp = 0xff & ((*value) >> i);
637 result = acpi_ec_write(ec, address, temp);
638 }
639 }
640
641 acpi_ec_burst_disable(ec);
642
643 switch (result) {
644 case -EINVAL:
645 return AE_BAD_PARAMETER;
646 break;
647 case -ENODEV:
648 return AE_NOT_FOUND;
649 break;
650 case -ETIME:
651 return AE_TIME;
652 break;
653 default:
654 return AE_OK;
655 }
656 }
657
658 /* --------------------------------------------------------------------------
659 FS Interface (/proc)
660 -------------------------------------------------------------------------- */
661
662 static struct proc_dir_entry *acpi_ec_dir;
663
664 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
665 {
666 struct acpi_ec *ec = seq->private;
667
668 if (!ec)
669 goto end;
670
671 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
672 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
673 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
674 seq_printf(seq, "use global lock:\t%s\n",
675 ec->global_lock ? "yes" : "no");
676 end:
677 return 0;
678 }
679
680 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
681 {
682 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
683 }
684
685 static const struct file_operations acpi_ec_info_ops = {
686 .open = acpi_ec_info_open_fs,
687 .read = seq_read,
688 .llseek = seq_lseek,
689 .release = single_release,
690 .owner = THIS_MODULE,
691 };
692
693 static int acpi_ec_add_fs(struct acpi_device *device)
694 {
695 struct proc_dir_entry *entry = NULL;
696
697 if (!acpi_device_dir(device)) {
698 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
699 acpi_ec_dir);
700 if (!acpi_device_dir(device))
701 return -ENODEV;
702 }
703
704 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
705 acpi_device_dir(device),
706 &acpi_ec_info_ops, acpi_driver_data(device));
707 if (!entry)
708 return -ENODEV;
709 return 0;
710 }
711
712 static int acpi_ec_remove_fs(struct acpi_device *device)
713 {
714
715 if (acpi_device_dir(device)) {
716 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
717 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
718 acpi_device_dir(device) = NULL;
719 }
720
721 return 0;
722 }
723
724 /* --------------------------------------------------------------------------
725 Driver Interface
726 -------------------------------------------------------------------------- */
727 static acpi_status
728 ec_parse_io_ports(struct acpi_resource *resource, void *context);
729
730 static struct acpi_ec *make_acpi_ec(void)
731 {
732 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
733 if (!ec)
734 return NULL;
735 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
736 mutex_init(&ec->lock);
737 init_waitqueue_head(&ec->wait);
738 INIT_LIST_HEAD(&ec->list);
739 spin_lock_init(&ec->curr_lock);
740 return ec;
741 }
742
743 static acpi_status
744 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
745 void *context, void **return_value)
746 {
747 char node_name[5];
748 struct acpi_buffer buffer = { sizeof(node_name), node_name };
749 struct acpi_ec *ec = context;
750 int value = 0;
751 acpi_status status;
752
753 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
754
755 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
756 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
757 }
758 return AE_OK;
759 }
760
761 static acpi_status
762 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
763 {
764 acpi_status status;
765 unsigned long long tmp = 0;
766
767 struct acpi_ec *ec = context;
768
769 /* clear addr values, ec_parse_io_ports depend on it */
770 ec->command_addr = ec->data_addr = 0;
771
772 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
773 ec_parse_io_ports, ec);
774 if (ACPI_FAILURE(status))
775 return status;
776
777 /* Get GPE bit assignment (EC events). */
778 /* TODO: Add support for _GPE returning a package */
779 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
780 if (ACPI_FAILURE(status))
781 return status;
782 ec->gpe = tmp;
783 /* Use the global lock for all EC transactions? */
784 tmp = 0;
785 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
786 ec->global_lock = tmp;
787 ec->handle = handle;
788 return AE_CTRL_TERMINATE;
789 }
790
791 static void ec_remove_handlers(struct acpi_ec *ec)
792 {
793 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
794 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
795 pr_err(PREFIX "failed to remove space handler\n");
796 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
797 &acpi_ec_gpe_handler)))
798 pr_err(PREFIX "failed to remove gpe handler\n");
799 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
800 }
801
802 static int acpi_ec_add(struct acpi_device *device)
803 {
804 struct acpi_ec *ec = NULL;
805
806 if (!device)
807 return -EINVAL;
808 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
809 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
810
811 /* Check for boot EC */
812 if (boot_ec &&
813 (boot_ec->handle == device->handle ||
814 boot_ec->handle == ACPI_ROOT_OBJECT)) {
815 ec = boot_ec;
816 boot_ec = NULL;
817 } else {
818 ec = make_acpi_ec();
819 if (!ec)
820 return -ENOMEM;
821 }
822 if (ec_parse_device(device->handle, 0, ec, NULL) !=
823 AE_CTRL_TERMINATE) {
824 kfree(ec);
825 return -EINVAL;
826 }
827
828 ec->handle = device->handle;
829
830 /* Find and register all query methods */
831 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
832 acpi_ec_register_query_methods, ec, NULL);
833
834 if (!first_ec)
835 first_ec = ec;
836 device->driver_data = ec;
837 acpi_ec_add_fs(device);
838 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
839 ec->gpe, ec->command_addr, ec->data_addr);
840 pr_info(PREFIX "driver started in %s mode\n",
841 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
842 return 0;
843 }
844
845 static int acpi_ec_remove(struct acpi_device *device, int type)
846 {
847 struct acpi_ec *ec;
848 struct acpi_ec_query_handler *handler, *tmp;
849
850 if (!device)
851 return -EINVAL;
852
853 ec = acpi_driver_data(device);
854 mutex_lock(&ec->lock);
855 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
856 list_del(&handler->node);
857 kfree(handler);
858 }
859 mutex_unlock(&ec->lock);
860 acpi_ec_remove_fs(device);
861 device->driver_data = NULL;
862 if (ec == first_ec)
863 first_ec = NULL;
864 kfree(ec);
865 return 0;
866 }
867
868 static acpi_status
869 ec_parse_io_ports(struct acpi_resource *resource, void *context)
870 {
871 struct acpi_ec *ec = context;
872
873 if (resource->type != ACPI_RESOURCE_TYPE_IO)
874 return AE_OK;
875
876 /*
877 * The first address region returned is the data port, and
878 * the second address region returned is the status/command
879 * port.
880 */
881 if (ec->data_addr == 0)
882 ec->data_addr = resource->data.io.minimum;
883 else if (ec->command_addr == 0)
884 ec->command_addr = resource->data.io.minimum;
885 else
886 return AE_CTRL_TERMINATE;
887
888 return AE_OK;
889 }
890
891 static int ec_install_handlers(struct acpi_ec *ec)
892 {
893 acpi_status status;
894 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
895 return 0;
896 status = acpi_install_gpe_handler(NULL, ec->gpe,
897 ACPI_GPE_EDGE_TRIGGERED,
898 &acpi_ec_gpe_handler, ec);
899 if (ACPI_FAILURE(status))
900 return -ENODEV;
901 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
902 acpi_enable_gpe(NULL, ec->gpe);
903 status = acpi_install_address_space_handler(ec->handle,
904 ACPI_ADR_SPACE_EC,
905 &acpi_ec_space_handler,
906 NULL, ec);
907 if (ACPI_FAILURE(status)) {
908 if (status == AE_NOT_FOUND) {
909 /*
910 * Maybe OS fails in evaluating the _REG object.
911 * The AE_NOT_FOUND error will be ignored and OS
912 * continue to initialize EC.
913 */
914 printk(KERN_ERR "Fail in evaluating the _REG object"
915 " of EC device. Broken bios is suspected.\n");
916 } else {
917 acpi_remove_gpe_handler(NULL, ec->gpe,
918 &acpi_ec_gpe_handler);
919 return -ENODEV;
920 }
921 }
922
923 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
924 return 0;
925 }
926
927 static int acpi_ec_start(struct acpi_device *device)
928 {
929 struct acpi_ec *ec;
930 int ret = 0;
931
932 if (!device)
933 return -EINVAL;
934
935 ec = acpi_driver_data(device);
936
937 if (!ec)
938 return -EINVAL;
939
940 ret = ec_install_handlers(ec);
941
942 /* EC is fully operational, allow queries */
943 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
944 return ret;
945 }
946
947 static int acpi_ec_stop(struct acpi_device *device, int type)
948 {
949 struct acpi_ec *ec;
950 if (!device)
951 return -EINVAL;
952 ec = acpi_driver_data(device);
953 if (!ec)
954 return -EINVAL;
955 ec_remove_handlers(ec);
956
957 return 0;
958 }
959
960 int __init acpi_boot_ec_enable(void)
961 {
962 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
963 return 0;
964 if (!ec_install_handlers(boot_ec)) {
965 first_ec = boot_ec;
966 return 0;
967 }
968 return -EFAULT;
969 }
970
971 static const struct acpi_device_id ec_device_ids[] = {
972 {"PNP0C09", 0},
973 {"", 0},
974 };
975
976 int __init acpi_ec_ecdt_probe(void)
977 {
978 acpi_status status;
979 struct acpi_ec *saved_ec = NULL;
980 struct acpi_table_ecdt *ecdt_ptr;
981
982 boot_ec = make_acpi_ec();
983 if (!boot_ec)
984 return -ENOMEM;
985 /*
986 * Generate a boot ec context
987 */
988 if (dmi_name_in_vendors("Micro-Star") ||
989 dmi_name_in_vendors("Notebook")) {
990 pr_info(PREFIX "Enabling special treatment for EC from MSI.\n");
991 EC_FLAGS_MSI = 1;
992 }
993 status = acpi_get_table(ACPI_SIG_ECDT, 1,
994 (struct acpi_table_header **)&ecdt_ptr);
995 if (ACPI_SUCCESS(status)) {
996 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
997 boot_ec->command_addr = ecdt_ptr->control.address;
998 boot_ec->data_addr = ecdt_ptr->data.address;
999 boot_ec->gpe = ecdt_ptr->gpe;
1000 boot_ec->handle = ACPI_ROOT_OBJECT;
1001 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
1002 /* Don't trust ECDT, which comes from ASUSTek */
1003 if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0)
1004 goto install;
1005 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1006 if (!saved_ec)
1007 return -ENOMEM;
1008 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
1009 /* fall through */
1010 }
1011 /* This workaround is needed only on some broken machines,
1012 * which require early EC, but fail to provide ECDT */
1013 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
1014 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1015 boot_ec, NULL);
1016 /* Check that acpi_get_devices actually find something */
1017 if (ACPI_FAILURE(status) || !boot_ec->handle)
1018 goto error;
1019 if (saved_ec) {
1020 /* try to find good ECDT from ASUSTek */
1021 if (saved_ec->command_addr != boot_ec->command_addr ||
1022 saved_ec->data_addr != boot_ec->data_addr ||
1023 saved_ec->gpe != boot_ec->gpe ||
1024 saved_ec->handle != boot_ec->handle)
1025 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
1026 "ECDT tables, which are very hard to workaround. "
1027 "Trying to use DSDT EC info instead. Please send "
1028 "output of acpidump to linux-acpi@vger.kernel.org\n");
1029 kfree(saved_ec);
1030 saved_ec = NULL;
1031 } else {
1032 /* We really need to limit this workaround, the only ASUS,
1033 * which needs it, has fake EC._INI method, so use it as flag.
1034 * Keep boot_ec struct as it will be needed soon.
1035 */
1036 acpi_handle dummy;
1037 if (!dmi_name_in_vendors("ASUS") ||
1038 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1039 &dummy)))
1040 return -ENODEV;
1041 }
1042 install:
1043 if (!ec_install_handlers(boot_ec)) {
1044 first_ec = boot_ec;
1045 return 0;
1046 }
1047 error:
1048 kfree(boot_ec);
1049 boot_ec = NULL;
1050 return -ENODEV;
1051 }
1052
1053 static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1054 {
1055 struct acpi_ec *ec = acpi_driver_data(device);
1056 /* Stop using GPE */
1057 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
1058 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
1059 acpi_disable_gpe(NULL, ec->gpe);
1060 return 0;
1061 }
1062
1063 static int acpi_ec_resume(struct acpi_device *device)
1064 {
1065 struct acpi_ec *ec = acpi_driver_data(device);
1066 /* Enable use of GPE back */
1067 clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
1068 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
1069 acpi_enable_gpe(NULL, ec->gpe);
1070 return 0;
1071 }
1072
1073 static struct acpi_driver acpi_ec_driver = {
1074 .name = "ec",
1075 .class = ACPI_EC_CLASS,
1076 .ids = ec_device_ids,
1077 .ops = {
1078 .add = acpi_ec_add,
1079 .remove = acpi_ec_remove,
1080 .start = acpi_ec_start,
1081 .stop = acpi_ec_stop,
1082 .suspend = acpi_ec_suspend,
1083 .resume = acpi_ec_resume,
1084 },
1085 };
1086
1087 int __init acpi_ec_init(void)
1088 {
1089 int result = 0;
1090
1091 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1092 if (!acpi_ec_dir)
1093 return -ENODEV;
1094
1095 /* Now register the driver for the EC */
1096 result = acpi_bus_register_driver(&acpi_ec_driver);
1097 if (result < 0) {
1098 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1099 return -ENODEV;
1100 }
1101
1102 return result;
1103 }
1104
1105 /* EC driver currently not unloadable */
1106 #if 0
1107 static void __exit acpi_ec_exit(void)
1108 {
1109
1110 acpi_bus_unregister_driver(&acpi_ec_driver);
1111
1112 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1113
1114 return;
1115 }
1116 #endif /* 0 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree