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hwmon/f71882fg: Set platform drvdata to NULL later
[linux/fpc-iii.git] / drivers / acpi / ec.c
blobe6b3c7e3514bbc0f00cd0bb40e58c517b1ad86a5
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 <acpi/actypes.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 #undef PREFIX
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_UDELAY 100 /* Wait 100us before polling EC again */
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_MODE, /* Expect GPE to be sent
79 * for status change */
80 EC_FLAGS_NO_GPE, /* Don't use GPE mode */
81 EC_FLAGS_GPE_STORM, /* GPE storm detected */
82 EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
83 * OpReg are installed */
84 };
85
86 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
87 /* External interfaces use first EC only, so remember */
88 typedef int (*acpi_ec_query_func) (void *data);
89
90 struct acpi_ec_query_handler {
91 struct list_head node;
92 acpi_ec_query_func func;
93 acpi_handle handle;
94 void *data;
95 u8 query_bit;
96 };
97
98 struct transaction {
99 const u8 *wdata;
100 u8 *rdata;
101 unsigned short irq_count;
102 u8 command;
103 u8 wi;
104 u8 ri;
105 u8 wlen;
106 u8 rlen;
107 bool done;
108 };
109
110 static struct acpi_ec {
111 acpi_handle handle;
112 unsigned long gpe;
113 unsigned long command_addr;
114 unsigned long data_addr;
115 unsigned long global_lock;
116 unsigned long flags;
117 struct mutex lock;
118 wait_queue_head_t wait;
119 struct list_head list;
120 struct transaction *curr;
121 spinlock_t curr_lock;
122 } *boot_ec, *first_ec;
123
124 /*
125 * Some Asus system have exchanged ECDT data/command IO addresses.
126 */
127 static int print_ecdt_error(const struct dmi_system_id *id)
128 {
129 printk(KERN_NOTICE PREFIX "%s detected - "
130 "ECDT has exchanged control/data I/O address\n",
131 id->ident);
132 return 0;
133 }
134
135 static struct dmi_system_id __cpuinitdata ec_dmi_table[] = {
136 {
137 print_ecdt_error, "Asus L4R", {
138 DMI_MATCH(DMI_BIOS_VERSION, "1008.006"),
139 DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),
140 DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL},
141 {
142 print_ecdt_error, "Asus M6R", {
143 DMI_MATCH(DMI_BIOS_VERSION, "0207"),
144 DMI_MATCH(DMI_PRODUCT_NAME, "M6R"),
145 DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL},
146 {},
147 };
148
149 /* --------------------------------------------------------------------------
150 Transaction Management
151 -------------------------------------------------------------------------- */
152
153 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
154 {
155 u8 x = inb(ec->command_addr);
156 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
157 return x;
158 }
159
160 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
161 {
162 u8 x = inb(ec->data_addr);
163 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
164 return x;
165 }
166
167 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
168 {
169 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
170 outb(command, ec->command_addr);
171 }
172
173 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
174 {
175 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
176 outb(data, ec->data_addr);
177 }
178
179 static int ec_transaction_done(struct acpi_ec *ec)
180 {
181 unsigned long flags;
182 int ret = 0;
183 spin_lock_irqsave(&ec->curr_lock, flags);
184 if (!ec->curr || ec->curr->done)
185 ret = 1;
186 spin_unlock_irqrestore(&ec->curr_lock, flags);
187 return ret;
188 }
189
190 static void start_transaction(struct acpi_ec *ec)
191 {
192 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
193 ec->curr->done = false;
194 acpi_ec_write_cmd(ec, ec->curr->command);
195 }
196
197 static void gpe_transaction(struct acpi_ec *ec, u8 status)
198 {
199 unsigned long flags;
200 spin_lock_irqsave(&ec->curr_lock, flags);
201 if (!ec->curr)
202 goto unlock;
203 if (ec->curr->wlen > ec->curr->wi) {
204 if ((status & ACPI_EC_FLAG_IBF) == 0)
205 acpi_ec_write_data(ec,
206 ec->curr->wdata[ec->curr->wi++]);
207 else
208 goto err;
209 } else if (ec->curr->rlen > ec->curr->ri) {
210 if ((status & ACPI_EC_FLAG_OBF) == 1) {
211 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
212 if (ec->curr->rlen == ec->curr->ri)
213 ec->curr->done = true;
214 } else
215 goto err;
216 } else if (ec->curr->wlen == ec->curr->wi &&
217 (status & ACPI_EC_FLAG_IBF) == 0)
218 ec->curr->done = true;
219 goto unlock;
220 err:
221 /* false interrupt, state didn't change */
222 if (in_interrupt())
223 ++ec->curr->irq_count;
224 unlock:
225 spin_unlock_irqrestore(&ec->curr_lock, flags);
226 }
227
228 static int acpi_ec_wait(struct acpi_ec *ec)
229 {
230 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
231 msecs_to_jiffies(ACPI_EC_DELAY)))
232 return 0;
233 /* try restart command if we get any false interrupts */
234 if (ec->curr->irq_count &&
235 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
236 pr_debug(PREFIX "controller reset, restart transaction\n");
237 start_transaction(ec);
238 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
239 msecs_to_jiffies(ACPI_EC_DELAY)))
240 return 0;
241 }
242 /* missing GPEs, switch back to poll mode */
243 if (printk_ratelimit())
244 pr_info(PREFIX "missing confirmations, "
245 "switch off interrupt mode.\n");
246 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
247 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
248 return 1;
249 }
250
251 static void acpi_ec_gpe_query(void *ec_cxt);
252
253 static int ec_check_sci(struct acpi_ec *ec, u8 state)
254 {
255 if (state & ACPI_EC_FLAG_SCI) {
256 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
257 return acpi_os_execute(OSL_EC_BURST_HANDLER,
258 acpi_ec_gpe_query, ec);
259 }
260 return 0;
261 }
262
263 static int ec_poll(struct acpi_ec *ec)
264 {
265 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
266 udelay(ACPI_EC_UDELAY);
267 while (time_before(jiffies, delay)) {
268 gpe_transaction(ec, acpi_ec_read_status(ec));
269 udelay(ACPI_EC_UDELAY);
270 if (ec_transaction_done(ec))
271 return 0;
272 }
273 return -ETIME;
274 }
275
276 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
277 struct transaction *t,
278 int force_poll)
279 {
280 unsigned long tmp;
281 int ret = 0;
282 pr_debug(PREFIX "transaction start\n");
283 /* disable GPE during transaction if storm is detected */
284 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
285 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
286 acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
287 }
288 /* start transaction */
289 spin_lock_irqsave(&ec->curr_lock, tmp);
290 /* following two actions should be kept atomic */
291 ec->curr = t;
292 start_transaction(ec);
293 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
294 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
295 spin_unlock_irqrestore(&ec->curr_lock, tmp);
296 /* if we selected poll mode or failed in GPE-mode do a poll loop */
297 if (force_poll ||
298 !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
299 acpi_ec_wait(ec))
300 ret = ec_poll(ec);
301 pr_debug(PREFIX "transaction end\n");
302 spin_lock_irqsave(&ec->curr_lock, tmp);
303 ec->curr = NULL;
304 spin_unlock_irqrestore(&ec->curr_lock, tmp);
305 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
306 /* check if we received SCI during transaction */
307 ec_check_sci(ec, acpi_ec_read_status(ec));
308 /* it is safe to enable GPE outside of transaction */
309 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
310 } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
311 t->irq_count > ACPI_EC_STORM_THRESHOLD) {
312 pr_info(PREFIX "GPE storm detected, "
313 "transactions will use polling mode\n");
314 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
315 }
316 return ret;
317 }
318
319 static int ec_check_ibf0(struct acpi_ec *ec)
320 {
321 u8 status = acpi_ec_read_status(ec);
322 return (status & ACPI_EC_FLAG_IBF) == 0;
323 }
324
325 static int ec_wait_ibf0(struct acpi_ec *ec)
326 {
327 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
328 /* interrupt wait manually if GPE mode is not active */
329 unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ?
330 msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1);
331 while (time_before(jiffies, delay))
332 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout))
333 return 0;
334 return -ETIME;
335 }
336
337 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
338 int force_poll)
339 {
340 int status;
341 u32 glk;
342 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
343 return -EINVAL;
344 if (t->rdata)
345 memset(t->rdata, 0, t->rlen);
346 mutex_lock(&ec->lock);
347 if (ec->global_lock) {
348 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
349 if (ACPI_FAILURE(status)) {
350 status = -ENODEV;
351 goto unlock;
352 }
353 }
354 if (ec_wait_ibf0(ec)) {
355 pr_err(PREFIX "input buffer is not empty, "
356 "aborting transaction\n");
357 status = -ETIME;
358 goto end;
359 }
360 status = acpi_ec_transaction_unlocked(ec, t, force_poll);
361 end:
362 if (ec->global_lock)
363 acpi_release_global_lock(glk);
364 unlock:
365 mutex_unlock(&ec->lock);
366 return status;
367 }
368
369 /*
370 * Note: samsung nv5000 doesn't work with ec burst mode.
371 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
372 */
373 int acpi_ec_burst_enable(struct acpi_ec *ec)
374 {
375 u8 d;
376 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
377 .wdata = NULL, .rdata = &d,
378 .wlen = 0, .rlen = 1};
379
380 return acpi_ec_transaction(ec, &t, 0);
381 }
382
383 int acpi_ec_burst_disable(struct acpi_ec *ec)
384 {
385 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
386 .wdata = NULL, .rdata = NULL,
387 .wlen = 0, .rlen = 0};
388
389 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
390 acpi_ec_transaction(ec, &t, 0) : 0;
391 }
392
393 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
394 {
395 int result;
396 u8 d;
397 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
398 .wdata = &address, .rdata = &d,
399 .wlen = 1, .rlen = 1};
400
401 result = acpi_ec_transaction(ec, &t, 0);
402 *data = d;
403 return result;
404 }
405
406 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
407 {
408 u8 wdata[2] = { address, data };
409 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
410 .wdata = wdata, .rdata = NULL,
411 .wlen = 2, .rlen = 0};
412
413 return acpi_ec_transaction(ec, &t, 0);
414 }
415
416 /*
417 * Externally callable EC access functions. For now, assume 1 EC only
418 */
419 int ec_burst_enable(void)
420 {
421 if (!first_ec)
422 return -ENODEV;
423 return acpi_ec_burst_enable(first_ec);
424 }
425
426 EXPORT_SYMBOL(ec_burst_enable);
427
428 int ec_burst_disable(void)
429 {
430 if (!first_ec)
431 return -ENODEV;
432 return acpi_ec_burst_disable(first_ec);
433 }
434
435 EXPORT_SYMBOL(ec_burst_disable);
436
437 int ec_read(u8 addr, u8 * val)
438 {
439 int err;
440 u8 temp_data;
441
442 if (!first_ec)
443 return -ENODEV;
444
445 err = acpi_ec_read(first_ec, addr, &temp_data);
446
447 if (!err) {
448 *val = temp_data;
449 return 0;
450 } else
451 return err;
452 }
453
454 EXPORT_SYMBOL(ec_read);
455
456 int ec_write(u8 addr, u8 val)
457 {
458 int err;
459
460 if (!first_ec)
461 return -ENODEV;
462
463 err = acpi_ec_write(first_ec, addr, val);
464
465 return err;
466 }
467
468 EXPORT_SYMBOL(ec_write);
469
470 int ec_transaction(u8 command,
471 const u8 * wdata, unsigned wdata_len,
472 u8 * rdata, unsigned rdata_len,
473 int force_poll)
474 {
475 struct transaction t = {.command = command,
476 .wdata = wdata, .rdata = rdata,
477 .wlen = wdata_len, .rlen = rdata_len};
478 if (!first_ec)
479 return -ENODEV;
480
481 return acpi_ec_transaction(first_ec, &t, force_poll);
482 }
483
484 EXPORT_SYMBOL(ec_transaction);
485
486 static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
487 {
488 int result;
489 u8 d;
490 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
491 .wdata = NULL, .rdata = &d,
492 .wlen = 0, .rlen = 1};
493 if (!ec || !data)
494 return -EINVAL;
495
496 /*
497 * Query the EC to find out which _Qxx method we need to evaluate.
498 * Note that successful completion of the query causes the ACPI_EC_SCI
499 * bit to be cleared (and thus clearing the interrupt source).
500 */
501
502 result = acpi_ec_transaction(ec, &t, 0);
503 if (result)
504 return result;
505
506 if (!d)
507 return -ENODATA;
508
509 *data = d;
510 return 0;
511 }
512
513 /* --------------------------------------------------------------------------
514 Event Management
515 -------------------------------------------------------------------------- */
516 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
517 acpi_handle handle, acpi_ec_query_func func,
518 void *data)
519 {
520 struct acpi_ec_query_handler *handler =
521 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
522 if (!handler)
523 return -ENOMEM;
524
525 handler->query_bit = query_bit;
526 handler->handle = handle;
527 handler->func = func;
528 handler->data = data;
529 mutex_lock(&ec->lock);
530 list_add(&handler->node, &ec->list);
531 mutex_unlock(&ec->lock);
532 return 0;
533 }
534
535 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
536
537 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
538 {
539 struct acpi_ec_query_handler *handler, *tmp;
540 mutex_lock(&ec->lock);
541 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
542 if (query_bit == handler->query_bit) {
543 list_del(&handler->node);
544 kfree(handler);
545 }
546 }
547 mutex_unlock(&ec->lock);
548 }
549
550 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
551
552 static void acpi_ec_gpe_query(void *ec_cxt)
553 {
554 struct acpi_ec *ec = ec_cxt;
555 u8 value = 0;
556 struct acpi_ec_query_handler *handler, copy;
557
558 if (!ec || acpi_ec_query(ec, &value))
559 return;
560 mutex_lock(&ec->lock);
561 list_for_each_entry(handler, &ec->list, node) {
562 if (value == handler->query_bit) {
563 /* have custom handler for this bit */
564 memcpy(&copy, handler, sizeof(copy));
565 mutex_unlock(&ec->lock);
566 if (copy.func) {
567 copy.func(copy.data);
568 } else if (copy.handle) {
569 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
570 }
571 return;
572 }
573 }
574 mutex_unlock(&ec->lock);
575 }
576
577 static u32 acpi_ec_gpe_handler(void *data)
578 {
579 struct acpi_ec *ec = data;
580 u8 status;
581
582 pr_debug(PREFIX "~~~> interrupt\n");
583 status = acpi_ec_read_status(ec);
584
585 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) {
586 gpe_transaction(ec, status);
587 if (ec_transaction_done(ec) &&
588 (status & ACPI_EC_FLAG_IBF) == 0)
589 wake_up(&ec->wait);
590 }
591
592 ec_check_sci(ec, status);
593 if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
594 !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
595 /* this is non-query, must be confirmation */
596 if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
597 if (printk_ratelimit())
598 pr_info(PREFIX "non-query interrupt received,"
599 " switching to interrupt mode\n");
600 } else {
601 /* hush, STORM switches the mode every transaction */
602 pr_debug(PREFIX "non-query interrupt received,"
603 " switching to interrupt mode\n");
604 }
605 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
606 }
607 return ACPI_INTERRUPT_HANDLED;
608 }
609
610 /* --------------------------------------------------------------------------
611 Address Space Management
612 -------------------------------------------------------------------------- */
613
614 static acpi_status
615 acpi_ec_space_handler(u32 function, acpi_physical_address address,
616 u32 bits, acpi_integer *value,
617 void *handler_context, void *region_context)
618 {
619 struct acpi_ec *ec = handler_context;
620 int result = 0, i;
621 u8 temp = 0;
622
623 if ((address > 0xFF) || !value || !handler_context)
624 return AE_BAD_PARAMETER;
625
626 if (function != ACPI_READ && function != ACPI_WRITE)
627 return AE_BAD_PARAMETER;
628
629 if (bits != 8 && acpi_strict)
630 return AE_BAD_PARAMETER;
631
632 acpi_ec_burst_enable(ec);
633
634 if (function == ACPI_READ) {
635 result = acpi_ec_read(ec, address, &temp);
636 *value = temp;
637 } else {
638 temp = 0xff & (*value);
639 result = acpi_ec_write(ec, address, temp);
640 }
641
642 for (i = 8; unlikely(bits - i > 0); i += 8) {
643 ++address;
644 if (function == ACPI_READ) {
645 result = acpi_ec_read(ec, address, &temp);
646 (*value) |= ((acpi_integer)temp) << i;
647 } else {
648 temp = 0xff & ((*value) >> i);
649 result = acpi_ec_write(ec, address, temp);
650 }
651 }
652
653 acpi_ec_burst_disable(ec);
654
655 switch (result) {
656 case -EINVAL:
657 return AE_BAD_PARAMETER;
658 break;
659 case -ENODEV:
660 return AE_NOT_FOUND;
661 break;
662 case -ETIME:
663 return AE_TIME;
664 break;
665 default:
666 return AE_OK;
667 }
668 }
669
670 /* --------------------------------------------------------------------------
671 FS Interface (/proc)
672 -------------------------------------------------------------------------- */
673
674 static struct proc_dir_entry *acpi_ec_dir;
675
676 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
677 {
678 struct acpi_ec *ec = seq->private;
679
680 if (!ec)
681 goto end;
682
683 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
684 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
685 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
686 seq_printf(seq, "use global lock:\t%s\n",
687 ec->global_lock ? "yes" : "no");
688 end:
689 return 0;
690 }
691
692 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
693 {
694 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
695 }
696
697 static struct file_operations acpi_ec_info_ops = {
698 .open = acpi_ec_info_open_fs,
699 .read = seq_read,
700 .llseek = seq_lseek,
701 .release = single_release,
702 .owner = THIS_MODULE,
703 };
704
705 static int acpi_ec_add_fs(struct acpi_device *device)
706 {
707 struct proc_dir_entry *entry = NULL;
708
709 if (!acpi_device_dir(device)) {
710 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
711 acpi_ec_dir);
712 if (!acpi_device_dir(device))
713 return -ENODEV;
714 }
715
716 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
717 acpi_device_dir(device),
718 &acpi_ec_info_ops, acpi_driver_data(device));
719 if (!entry)
720 return -ENODEV;
721 return 0;
722 }
723
724 static int acpi_ec_remove_fs(struct acpi_device *device)
725 {
726
727 if (acpi_device_dir(device)) {
728 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
729 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
730 acpi_device_dir(device) = NULL;
731 }
732
733 return 0;
734 }
735
736 /* --------------------------------------------------------------------------
737 Driver Interface
738 -------------------------------------------------------------------------- */
739 static acpi_status
740 ec_parse_io_ports(struct acpi_resource *resource, void *context);
741
742 static struct acpi_ec *make_acpi_ec(void)
743 {
744 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
745 if (!ec)
746 return NULL;
747 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
748 mutex_init(&ec->lock);
749 init_waitqueue_head(&ec->wait);
750 INIT_LIST_HEAD(&ec->list);
751 spin_lock_init(&ec->curr_lock);
752 return ec;
753 }
754
755 static acpi_status
756 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
757 void *context, void **return_value)
758 {
759 struct acpi_namespace_node *node = handle;
760 struct acpi_ec *ec = context;
761 int value = 0;
762
763 if (sscanf(node->name.ascii, "_Q%2x", &value) == 1)
764 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
765
766 return AE_OK;
767 }
768
769 static acpi_status
770 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
771 {
772 acpi_status status;
773 unsigned long long tmp = 0;
774
775 struct acpi_ec *ec = context;
776 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
777 ec_parse_io_ports, ec);
778 if (ACPI_FAILURE(status))
779 return status;
780
781 /* Get GPE bit assignment (EC events). */
782 /* TODO: Add support for _GPE returning a package */
783 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
784 if (ACPI_FAILURE(status))
785 return status;
786 ec->gpe = tmp;
787 /* Use the global lock for all EC transactions? */
788 tmp = 0;
789 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
790 ec->global_lock = tmp;
791 ec->handle = handle;
792 return AE_CTRL_TERMINATE;
793 }
794
795 static void ec_remove_handlers(struct acpi_ec *ec)
796 {
797 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
798 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
799 pr_err(PREFIX "failed to remove space handler\n");
800 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
801 &acpi_ec_gpe_handler)))
802 pr_err(PREFIX "failed to remove gpe handler\n");
803 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
804 }
805
806 static int acpi_ec_add(struct acpi_device *device)
807 {
808 struct acpi_ec *ec = NULL;
809
810 if (!device)
811 return -EINVAL;
812 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
813 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
814
815 /* Check for boot EC */
816 if (boot_ec &&
817 (boot_ec->handle == device->handle ||
818 boot_ec->handle == ACPI_ROOT_OBJECT)) {
819 ec = boot_ec;
820 boot_ec = NULL;
821 } else {
822 ec = make_acpi_ec();
823 if (!ec)
824 return -ENOMEM;
825 if (ec_parse_device(device->handle, 0, ec, NULL) !=
826 AE_CTRL_TERMINATE) {
827 kfree(ec);
828 return -EINVAL;
829 }
830 }
831
832 ec->handle = device->handle;
833
834 /* Find and register all query methods */
835 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
836 acpi_ec_register_query_methods, ec, NULL);
837
838 if (!first_ec)
839 first_ec = ec;
840 acpi_driver_data(device) = ec;
841 acpi_ec_add_fs(device);
842 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
843 ec->gpe, ec->command_addr, ec->data_addr);
844 pr_info(PREFIX "driver started in %s mode\n",
845 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
846 return 0;
847 }
848
849 static int acpi_ec_remove(struct acpi_device *device, int type)
850 {
851 struct acpi_ec *ec;
852 struct acpi_ec_query_handler *handler, *tmp;
853
854 if (!device)
855 return -EINVAL;
856
857 ec = acpi_driver_data(device);
858 mutex_lock(&ec->lock);
859 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
860 list_del(&handler->node);
861 kfree(handler);
862 }
863 mutex_unlock(&ec->lock);
864 acpi_ec_remove_fs(device);
865 acpi_driver_data(device) = NULL;
866 if (ec == first_ec)
867 first_ec = NULL;
868 kfree(ec);
869 return 0;
870 }
871
872 static acpi_status
873 ec_parse_io_ports(struct acpi_resource *resource, void *context)
874 {
875 struct acpi_ec *ec = context;
876
877 if (resource->type != ACPI_RESOURCE_TYPE_IO)
878 return AE_OK;
879
880 /*
881 * The first address region returned is the data port, and
882 * the second address region returned is the status/command
883 * port.
884 */
885 if (ec->data_addr == 0)
886 ec->data_addr = resource->data.io.minimum;
887 else if (ec->command_addr == 0)
888 ec->command_addr = resource->data.io.minimum;
889 else
890 return AE_CTRL_TERMINATE;
891
892 return AE_OK;
893 }
894
895 static int ec_install_handlers(struct acpi_ec *ec)
896 {
897 acpi_status status;
898 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
899 return 0;
900 status = acpi_install_gpe_handler(NULL, ec->gpe,
901 ACPI_GPE_EDGE_TRIGGERED,
902 &acpi_ec_gpe_handler, ec);
903 if (ACPI_FAILURE(status))
904 return -ENODEV;
905 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
906 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
907 status = acpi_install_address_space_handler(ec->handle,
908 ACPI_ADR_SPACE_EC,
909 &acpi_ec_space_handler,
910 NULL, ec);
911 if (ACPI_FAILURE(status)) {
912 acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
913 return -ENODEV;
914 }
915
916 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
917 return 0;
918 }
919
920 static int acpi_ec_start(struct acpi_device *device)
921 {
922 struct acpi_ec *ec;
923 int ret = 0;
924
925 if (!device)
926 return -EINVAL;
927
928 ec = acpi_driver_data(device);
929
930 if (!ec)
931 return -EINVAL;
932
933 ret = ec_install_handlers(ec);
934
935 /* EC is fully operational, allow queries */
936 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
937 return ret;
938 }
939
940 static int acpi_ec_stop(struct acpi_device *device, int type)
941 {
942 struct acpi_ec *ec;
943 if (!device)
944 return -EINVAL;
945 ec = acpi_driver_data(device);
946 if (!ec)
947 return -EINVAL;
948 ec_remove_handlers(ec);
949
950 return 0;
951 }
952
953 int __init acpi_boot_ec_enable(void)
954 {
955 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
956 return 0;
957 if (!ec_install_handlers(boot_ec)) {
958 first_ec = boot_ec;
959 return 0;
960 }
961 return -EFAULT;
962 }
963
964 static const struct acpi_device_id ec_device_ids[] = {
965 {"PNP0C09", 0},
966 {"", 0},
967 };
968
969 int __init acpi_ec_ecdt_probe(void)
970 {
971 acpi_status status;
972 struct acpi_table_ecdt *ecdt_ptr;
973 acpi_handle dummy;
974
975 boot_ec = make_acpi_ec();
976 if (!boot_ec)
977 return -ENOMEM;
978 /*
979 * Generate a boot ec context
980 */
981 status = acpi_get_table(ACPI_SIG_ECDT, 1,
982 (struct acpi_table_header **)&ecdt_ptr);
983 if (ACPI_SUCCESS(status)) {
984 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
985 boot_ec->command_addr = ecdt_ptr->control.address;
986 boot_ec->data_addr = ecdt_ptr->data.address;
987 if (dmi_check_system(ec_dmi_table)) {
988 /*
989 * If the board falls into ec_dmi_table, it means
990 * that ECDT table gives the incorrect command/status
991 * & data I/O address. Just fix it.
992 */
993 boot_ec->data_addr = ecdt_ptr->control.address;
994 boot_ec->command_addr = ecdt_ptr->data.address;
995 }
996 boot_ec->gpe = ecdt_ptr->gpe;
997 boot_ec->handle = ACPI_ROOT_OBJECT;
998 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
999 /* Add some basic check against completely broken table */
1000 if (boot_ec->data_addr != boot_ec->command_addr)
1001 goto install;
1002 /* fall through */
1003 }
1004 /* This workaround is needed only on some broken machines,
1005 * which require early EC, but fail to provide ECDT */
1006 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
1007 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1008 boot_ec, NULL);
1009 /* Check that acpi_get_devices actually find something */
1010 if (ACPI_FAILURE(status) || !boot_ec->handle)
1011 goto error;
1012 /* We really need to limit this workaround, the only ASUS,
1013 * which needs it, has fake EC._INI method, so use it as flag.
1014 * Keep boot_ec struct as it will be needed soon.
1015 */
1016 if (!dmi_name_in_vendors("ASUS") ||
1017 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &dummy)))
1018 return -ENODEV;
1019 install:
1020 if (!ec_install_handlers(boot_ec)) {
1021 first_ec = boot_ec;
1022 return 0;
1023 }
1024 error:
1025 kfree(boot_ec);
1026 boot_ec = NULL;
1027 return -ENODEV;
1028 }
1029
1030 static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1031 {
1032 struct acpi_ec *ec = acpi_driver_data(device);
1033 /* Stop using GPE */
1034 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
1035 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
1036 acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
1037 return 0;
1038 }
1039
1040 static int acpi_ec_resume(struct acpi_device *device)
1041 {
1042 struct acpi_ec *ec = acpi_driver_data(device);
1043 /* Enable use of GPE back */
1044 clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
1045 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
1046 return 0;
1047 }
1048
1049 static struct acpi_driver acpi_ec_driver = {
1050 .name = "ec",
1051 .class = ACPI_EC_CLASS,
1052 .ids = ec_device_ids,
1053 .ops = {
1054 .add = acpi_ec_add,
1055 .remove = acpi_ec_remove,
1056 .start = acpi_ec_start,
1057 .stop = acpi_ec_stop,
1058 .suspend = acpi_ec_suspend,
1059 .resume = acpi_ec_resume,
1060 },
1061 };
1062
1063 static int __init acpi_ec_init(void)
1064 {
1065 int result = 0;
1066
1067 if (acpi_disabled)
1068 return 0;
1069
1070 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1071 if (!acpi_ec_dir)
1072 return -ENODEV;
1073
1074 /* Now register the driver for the EC */
1075 result = acpi_bus_register_driver(&acpi_ec_driver);
1076 if (result < 0) {
1077 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1078 return -ENODEV;
1079 }
1080
1081 return result;
1082 }
1083
1084 subsys_initcall(acpi_ec_init);
1085
1086 /* EC driver currently not unloadable */
1087 #if 0
1088 static void __exit acpi_ec_exit(void)
1089 {
1090
1091 acpi_bus_unregister_driver(&acpi_ec_driver);
1092
1093 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1094
1095 return;
1096 }
1097 #endif /* 0 */
Linux with added FPC-III support