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hugetlb: make unmap_ref_private multi-size-aware
[zen-stable.git] / drivers / acpi / ec.c
blobcf41f9fc24a73fed7d7bd0799f654050609ef128
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 ++ec->curr->irq_count;
223 unlock:
224 spin_unlock_irqrestore(&ec->curr_lock, flags);
225 }
226
227 static int acpi_ec_wait(struct acpi_ec *ec)
228 {
229 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
230 msecs_to_jiffies(ACPI_EC_DELAY)))
231 return 0;
232 /* try restart command if we get any false interrupts */
233 if (ec->curr->irq_count &&
234 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
235 pr_debug(PREFIX "controller reset, restart transaction\n");
236 start_transaction(ec);
237 if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
238 msecs_to_jiffies(ACPI_EC_DELAY)))
239 return 0;
240 }
241 /* missing GPEs, switch back to poll mode */
242 if (printk_ratelimit())
243 pr_info(PREFIX "missing confirmations, "
244 "switch off interrupt mode.\n");
245 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
246 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
247 return 1;
248 }
249
250 static void acpi_ec_gpe_query(void *ec_cxt);
251
252 static int ec_check_sci(struct acpi_ec *ec, u8 state)
253 {
254 if (state & ACPI_EC_FLAG_SCI) {
255 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
256 return acpi_os_execute(OSL_EC_BURST_HANDLER,
257 acpi_ec_gpe_query, ec);
258 }
259 return 0;
260 }
261
262 static int ec_poll(struct acpi_ec *ec)
263 {
264 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
265 udelay(ACPI_EC_UDELAY);
266 while (time_before(jiffies, delay)) {
267 gpe_transaction(ec, acpi_ec_read_status(ec));
268 udelay(ACPI_EC_UDELAY);
269 if (ec_transaction_done(ec))
270 return 0;
271 }
272 return -ETIME;
273 }
274
275 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
276 struct transaction *t,
277 int force_poll)
278 {
279 unsigned long tmp;
280 int ret = 0;
281 pr_debug(PREFIX "transaction start\n");
282 /* disable GPE during transaction if storm is detected */
283 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
284 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
285 acpi_disable_gpe(NULL, ec->gpe);
286 }
287 /* start transaction */
288 spin_lock_irqsave(&ec->curr_lock, tmp);
289 /* following two actions should be kept atomic */
290 ec->curr = t;
291 start_transaction(ec);
292 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
293 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
294 spin_unlock_irqrestore(&ec->curr_lock, tmp);
295 /* if we selected poll mode or failed in GPE-mode do a poll loop */
296 if (force_poll ||
297 !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
298 acpi_ec_wait(ec))
299 ret = ec_poll(ec);
300 pr_debug(PREFIX "transaction end\n");
301 spin_lock_irqsave(&ec->curr_lock, tmp);
302 ec->curr = NULL;
303 spin_unlock_irqrestore(&ec->curr_lock, tmp);
304 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
305 /* check if we received SCI during transaction */
306 ec_check_sci(ec, acpi_ec_read_status(ec));
307 /* it is safe to enable GPE outside of transaction */
308 acpi_enable_gpe(NULL, ec->gpe);
309 } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
310 t->irq_count > ACPI_EC_STORM_THRESHOLD) {
311 pr_info(PREFIX "GPE storm detected, "
312 "transactions will use polling mode\n");
313 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
314 }
315 return ret;
316 }
317
318 static int ec_check_ibf0(struct acpi_ec *ec)
319 {
320 u8 status = acpi_ec_read_status(ec);
321 return (status & ACPI_EC_FLAG_IBF) == 0;
322 }
323
324 static int ec_wait_ibf0(struct acpi_ec *ec)
325 {
326 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
327 /* interrupt wait manually if GPE mode is not active */
328 unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ?
329 msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1);
330 while (time_before(jiffies, delay))
331 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout))
332 return 0;
333 return -ETIME;
334 }
335
336 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
337 int force_poll)
338 {
339 int status;
340 u32 glk;
341 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
342 return -EINVAL;
343 if (t->rdata)
344 memset(t->rdata, 0, t->rlen);
345 mutex_lock(&ec->lock);
346 if (ec->global_lock) {
347 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
348 if (ACPI_FAILURE(status)) {
349 status = -ENODEV;
350 goto unlock;
351 }
352 }
353 if (ec_wait_ibf0(ec)) {
354 pr_err(PREFIX "input buffer is not empty, "
355 "aborting transaction\n");
356 status = -ETIME;
357 goto end;
358 }
359 status = acpi_ec_transaction_unlocked(ec, t, force_poll);
360 end:
361 if (ec->global_lock)
362 acpi_release_global_lock(glk);
363 unlock:
364 mutex_unlock(&ec->lock);
365 return status;
366 }
367
368 /*
369 * Note: samsung nv5000 doesn't work with ec burst mode.
370 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
371 */
372 int acpi_ec_burst_enable(struct acpi_ec *ec)
373 {
374 u8 d;
375 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
376 .wdata = NULL, .rdata = &d,
377 .wlen = 0, .rlen = 1};
378
379 return acpi_ec_transaction(ec, &t, 0);
380 }
381
382 int acpi_ec_burst_disable(struct acpi_ec *ec)
383 {
384 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
385 .wdata = NULL, .rdata = NULL,
386 .wlen = 0, .rlen = 0};
387
388 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
389 acpi_ec_transaction(ec, &t, 0) : 0;
390 }
391
392 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
393 {
394 int result;
395 u8 d;
396 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
397 .wdata = &address, .rdata = &d,
398 .wlen = 1, .rlen = 1};
399
400 result = acpi_ec_transaction(ec, &t, 0);
401 *data = d;
402 return result;
403 }
404
405 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
406 {
407 u8 wdata[2] = { address, data };
408 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
409 .wdata = wdata, .rdata = NULL,
410 .wlen = 2, .rlen = 0};
411
412 return acpi_ec_transaction(ec, &t, 0);
413 }
414
415 /*
416 * Externally callable EC access functions. For now, assume 1 EC only
417 */
418 int ec_burst_enable(void)
419 {
420 if (!first_ec)
421 return -ENODEV;
422 return acpi_ec_burst_enable(first_ec);
423 }
424
425 EXPORT_SYMBOL(ec_burst_enable);
426
427 int ec_burst_disable(void)
428 {
429 if (!first_ec)
430 return -ENODEV;
431 return acpi_ec_burst_disable(first_ec);
432 }
433
434 EXPORT_SYMBOL(ec_burst_disable);
435
436 int ec_read(u8 addr, u8 * val)
437 {
438 int err;
439 u8 temp_data;
440
441 if (!first_ec)
442 return -ENODEV;
443
444 err = acpi_ec_read(first_ec, addr, &temp_data);
445
446 if (!err) {
447 *val = temp_data;
448 return 0;
449 } else
450 return err;
451 }
452
453 EXPORT_SYMBOL(ec_read);
454
455 int ec_write(u8 addr, u8 val)
456 {
457 int err;
458
459 if (!first_ec)
460 return -ENODEV;
461
462 err = acpi_ec_write(first_ec, addr, val);
463
464 return err;
465 }
466
467 EXPORT_SYMBOL(ec_write);
468
469 int ec_transaction(u8 command,
470 const u8 * wdata, unsigned wdata_len,
471 u8 * rdata, unsigned rdata_len,
472 int force_poll)
473 {
474 struct transaction t = {.command = command,
475 .wdata = wdata, .rdata = rdata,
476 .wlen = wdata_len, .rlen = rdata_len};
477 if (!first_ec)
478 return -ENODEV;
479
480 return acpi_ec_transaction(first_ec, &t, force_poll);
481 }
482
483 EXPORT_SYMBOL(ec_transaction);
484
485 static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
486 {
487 int result;
488 u8 d;
489 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
490 .wdata = NULL, .rdata = &d,
491 .wlen = 0, .rlen = 1};
492 if (!ec || !data)
493 return -EINVAL;
494
495 /*
496 * Query the EC to find out which _Qxx method we need to evaluate.
497 * Note that successful completion of the query causes the ACPI_EC_SCI
498 * bit to be cleared (and thus clearing the interrupt source).
499 */
500
501 result = acpi_ec_transaction(ec, &t, 0);
502 if (result)
503 return result;
504
505 if (!d)
506 return -ENODATA;
507
508 *data = d;
509 return 0;
510 }
511
512 /* --------------------------------------------------------------------------
513 Event Management
514 -------------------------------------------------------------------------- */
515 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
516 acpi_handle handle, acpi_ec_query_func func,
517 void *data)
518 {
519 struct acpi_ec_query_handler *handler =
520 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
521 if (!handler)
522 return -ENOMEM;
523
524 handler->query_bit = query_bit;
525 handler->handle = handle;
526 handler->func = func;
527 handler->data = data;
528 mutex_lock(&ec->lock);
529 list_add(&handler->node, &ec->list);
530 mutex_unlock(&ec->lock);
531 return 0;
532 }
533
534 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
535
536 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
537 {
538 struct acpi_ec_query_handler *handler, *tmp;
539 mutex_lock(&ec->lock);
540 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
541 if (query_bit == handler->query_bit) {
542 list_del(&handler->node);
543 kfree(handler);
544 }
545 }
546 mutex_unlock(&ec->lock);
547 }
548
549 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
550
551 static void acpi_ec_gpe_query(void *ec_cxt)
552 {
553 struct acpi_ec *ec = ec_cxt;
554 u8 value = 0;
555 struct acpi_ec_query_handler *handler, copy;
556
557 if (!ec || acpi_ec_query(ec, &value))
558 return;
559 mutex_lock(&ec->lock);
560 list_for_each_entry(handler, &ec->list, node) {
561 if (value == handler->query_bit) {
562 /* have custom handler for this bit */
563 memcpy(&copy, handler, sizeof(copy));
564 mutex_unlock(&ec->lock);
565 if (copy.func) {
566 copy.func(copy.data);
567 } else if (copy.handle) {
568 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
569 }
570 return;
571 }
572 }
573 mutex_unlock(&ec->lock);
574 }
575
576 static u32 acpi_ec_gpe_handler(void *data)
577 {
578 struct acpi_ec *ec = data;
579 u8 status;
580
581 pr_debug(PREFIX "~~~> interrupt\n");
582 status = acpi_ec_read_status(ec);
583
584 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) {
585 gpe_transaction(ec, status);
586 if (ec_transaction_done(ec) &&
587 (status & ACPI_EC_FLAG_IBF) == 0)
588 wake_up(&ec->wait);
589 }
590
591 ec_check_sci(ec, status);
592 if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
593 !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
594 /* this is non-query, must be confirmation */
595 if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
596 if (printk_ratelimit())
597 pr_info(PREFIX "non-query interrupt received,"
598 " switching to interrupt mode\n");
599 } else {
600 /* hush, STORM switches the mode every transaction */
601 pr_debug(PREFIX "non-query interrupt received,"
602 " switching to interrupt mode\n");
603 }
604 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
605 }
606 return ACPI_INTERRUPT_HANDLED;
607 }
608
609 /* --------------------------------------------------------------------------
610 Address Space Management
611 -------------------------------------------------------------------------- */
612
613 static acpi_status
614 acpi_ec_space_handler(u32 function, acpi_physical_address address,
615 u32 bits, acpi_integer *value,
616 void *handler_context, void *region_context)
617 {
618 struct acpi_ec *ec = handler_context;
619 int result = 0, i;
620 u8 temp = 0;
621
622 if ((address > 0xFF) || !value || !handler_context)
623 return AE_BAD_PARAMETER;
624
625 if (function != ACPI_READ && function != ACPI_WRITE)
626 return AE_BAD_PARAMETER;
627
628 if (bits != 8 && acpi_strict)
629 return AE_BAD_PARAMETER;
630
631 acpi_ec_burst_enable(ec);
632
633 if (function == ACPI_READ) {
634 result = acpi_ec_read(ec, address, &temp);
635 *value = temp;
636 } else {
637 temp = 0xff & (*value);
638 result = acpi_ec_write(ec, address, temp);
639 }
640
641 for (i = 8; unlikely(bits - i > 0); i += 8) {
642 ++address;
643 if (function == ACPI_READ) {
644 result = acpi_ec_read(ec, address, &temp);
645 (*value) |= ((acpi_integer)temp) << i;
646 } else {
647 temp = 0xff & ((*value) >> i);
648 result = acpi_ec_write(ec, address, temp);
649 }
650 }
651
652 acpi_ec_burst_disable(ec);
653
654 switch (result) {
655 case -EINVAL:
656 return AE_BAD_PARAMETER;
657 break;
658 case -ENODEV:
659 return AE_NOT_FOUND;
660 break;
661 case -ETIME:
662 return AE_TIME;
663 break;
664 default:
665 return AE_OK;
666 }
667 }
668
669 /* --------------------------------------------------------------------------
670 FS Interface (/proc)
671 -------------------------------------------------------------------------- */
672
673 static struct proc_dir_entry *acpi_ec_dir;
674
675 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
676 {
677 struct acpi_ec *ec = seq->private;
678
679 if (!ec)
680 goto end;
681
682 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
683 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
684 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
685 seq_printf(seq, "use global lock:\t%s\n",
686 ec->global_lock ? "yes" : "no");
687 end:
688 return 0;
689 }
690
691 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
692 {
693 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
694 }
695
696 static struct file_operations acpi_ec_info_ops = {
697 .open = acpi_ec_info_open_fs,
698 .read = seq_read,
699 .llseek = seq_lseek,
700 .release = single_release,
701 .owner = THIS_MODULE,
702 };
703
704 static int acpi_ec_add_fs(struct acpi_device *device)
705 {
706 struct proc_dir_entry *entry = NULL;
707
708 if (!acpi_device_dir(device)) {
709 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
710 acpi_ec_dir);
711 if (!acpi_device_dir(device))
712 return -ENODEV;
713 }
714
715 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
716 acpi_device_dir(device),
717 &acpi_ec_info_ops, acpi_driver_data(device));
718 if (!entry)
719 return -ENODEV;
720 return 0;
721 }
722
723 static int acpi_ec_remove_fs(struct acpi_device *device)
724 {
725
726 if (acpi_device_dir(device)) {
727 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
728 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
729 acpi_device_dir(device) = NULL;
730 }
731
732 return 0;
733 }
734
735 /* --------------------------------------------------------------------------
736 Driver Interface
737 -------------------------------------------------------------------------- */
738 static acpi_status
739 ec_parse_io_ports(struct acpi_resource *resource, void *context);
740
741 static struct acpi_ec *make_acpi_ec(void)
742 {
743 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
744 if (!ec)
745 return NULL;
746 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
747 mutex_init(&ec->lock);
748 init_waitqueue_head(&ec->wait);
749 INIT_LIST_HEAD(&ec->list);
750 spin_lock_init(&ec->curr_lock);
751 return ec;
752 }
753
754 static acpi_status
755 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
756 void *context, void **return_value)
757 {
758 struct acpi_namespace_node *node = handle;
759 struct acpi_ec *ec = context;
760 int value = 0;
761 if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
762 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
763 }
764 return AE_OK;
765 }
766
767 static acpi_status
768 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
769 {
770 acpi_status status;
771 unsigned long long tmp = 0;
772
773 struct acpi_ec *ec = context;
774 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
775 ec_parse_io_ports, ec);
776 if (ACPI_FAILURE(status))
777 return status;
778
779 /* Get GPE bit assignment (EC events). */
780 /* TODO: Add support for _GPE returning a package */
781 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
782 if (ACPI_FAILURE(status))
783 return status;
784 ec->gpe = tmp;
785 /* Use the global lock for all EC transactions? */
786 tmp = 0;
787 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
788 ec->global_lock = tmp;
789 ec->handle = handle;
790 return AE_CTRL_TERMINATE;
791 }
792
793 static void ec_remove_handlers(struct acpi_ec *ec)
794 {
795 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
796 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
797 pr_err(PREFIX "failed to remove space handler\n");
798 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
799 &acpi_ec_gpe_handler)))
800 pr_err(PREFIX "failed to remove gpe handler\n");
801 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
802 }
803
804 static int acpi_ec_add(struct acpi_device *device)
805 {
806 struct acpi_ec *ec = NULL;
807
808 if (!device)
809 return -EINVAL;
810 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
811 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
812
813 /* Check for boot EC */
814 if (boot_ec &&
815 (boot_ec->handle == device->handle ||
816 boot_ec->handle == ACPI_ROOT_OBJECT)) {
817 ec = boot_ec;
818 boot_ec = NULL;
819 } else {
820 ec = make_acpi_ec();
821 if (!ec)
822 return -ENOMEM;
823 if (ec_parse_device(device->handle, 0, ec, NULL) !=
824 AE_CTRL_TERMINATE) {
825 kfree(ec);
826 return -EINVAL;
827 }
828 }
829
830 ec->handle = device->handle;
831
832 /* Find and register all query methods */
833 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
834 acpi_ec_register_query_methods, ec, NULL);
835
836 if (!first_ec)
837 first_ec = ec;
838 device->driver_data = ec;
839 acpi_ec_add_fs(device);
840 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
841 ec->gpe, ec->command_addr, ec->data_addr);
842 pr_info(PREFIX "driver started in %s mode\n",
843 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
844 return 0;
845 }
846
847 static int acpi_ec_remove(struct acpi_device *device, int type)
848 {
849 struct acpi_ec *ec;
850 struct acpi_ec_query_handler *handler, *tmp;
851
852 if (!device)
853 return -EINVAL;
854
855 ec = acpi_driver_data(device);
856 mutex_lock(&ec->lock);
857 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
858 list_del(&handler->node);
859 kfree(handler);
860 }
861 mutex_unlock(&ec->lock);
862 acpi_ec_remove_fs(device);
863 device->driver_data = NULL;
864 if (ec == first_ec)
865 first_ec = NULL;
866 kfree(ec);
867 return 0;
868 }
869
870 static acpi_status
871 ec_parse_io_ports(struct acpi_resource *resource, void *context)
872 {
873 struct acpi_ec *ec = context;
874
875 if (resource->type != ACPI_RESOURCE_TYPE_IO)
876 return AE_OK;
877
878 /*
879 * The first address region returned is the data port, and
880 * the second address region returned is the status/command
881 * port.
882 */
883 if (ec->data_addr == 0)
884 ec->data_addr = resource->data.io.minimum;
885 else if (ec->command_addr == 0)
886 ec->command_addr = resource->data.io.minimum;
887 else
888 return AE_CTRL_TERMINATE;
889
890 return AE_OK;
891 }
892
893 static int ec_install_handlers(struct acpi_ec *ec)
894 {
895 acpi_status status;
896 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
897 return 0;
898 status = acpi_install_gpe_handler(NULL, ec->gpe,
899 ACPI_GPE_EDGE_TRIGGERED,
900 &acpi_ec_gpe_handler, ec);
901 if (ACPI_FAILURE(status))
902 return -ENODEV;
903 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
904 acpi_enable_gpe(NULL, ec->gpe);
905 status = acpi_install_address_space_handler(ec->handle,
906 ACPI_ADR_SPACE_EC,
907 &acpi_ec_space_handler,
908 NULL, ec);
909 if (ACPI_FAILURE(status)) {
910 if (status == AE_NOT_FOUND) {
911 /*
912 * Maybe OS fails in evaluating the _REG object.
913 * The AE_NOT_FOUND error will be ignored and OS
914 * continue to initialize EC.
915 */
916 printk(KERN_ERR "Fail in evaluating the _REG object"
917 " of EC device. Broken bios is suspected.\n");
918 } else {
919 acpi_remove_gpe_handler(NULL, ec->gpe,
920 &acpi_ec_gpe_handler);
921 return -ENODEV;
922 }
923 }
924
925 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
926 return 0;
927 }
928
929 static int acpi_ec_start(struct acpi_device *device)
930 {
931 struct acpi_ec *ec;
932 int ret = 0;
933
934 if (!device)
935 return -EINVAL;
936
937 ec = acpi_driver_data(device);
938
939 if (!ec)
940 return -EINVAL;
941
942 ret = ec_install_handlers(ec);
943
944 /* EC is fully operational, allow queries */
945 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
946 return ret;
947 }
948
949 static int acpi_ec_stop(struct acpi_device *device, int type)
950 {
951 struct acpi_ec *ec;
952 if (!device)
953 return -EINVAL;
954 ec = acpi_driver_data(device);
955 if (!ec)
956 return -EINVAL;
957 ec_remove_handlers(ec);
958
959 return 0;
960 }
961
962 int __init acpi_boot_ec_enable(void)
963 {
964 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
965 return 0;
966 if (!ec_install_handlers(boot_ec)) {
967 first_ec = boot_ec;
968 return 0;
969 }
970 return -EFAULT;
971 }
972
973 static const struct acpi_device_id ec_device_ids[] = {
974 {"PNP0C09", 0},
975 {"", 0},
976 };
977
978 int __init acpi_ec_ecdt_probe(void)
979 {
980 int ret;
981 acpi_status status;
982 struct acpi_table_ecdt *ecdt_ptr;
983
984 boot_ec = make_acpi_ec();
985 if (!boot_ec)
986 return -ENOMEM;
987 /*
988 * Generate a boot ec context
989 */
990 status = acpi_get_table(ACPI_SIG_ECDT, 1,
991 (struct acpi_table_header **)&ecdt_ptr);
992 if (ACPI_SUCCESS(status)) {
993 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
994 boot_ec->command_addr = ecdt_ptr->control.address;
995 boot_ec->data_addr = ecdt_ptr->data.address;
996 if (dmi_check_system(ec_dmi_table)) {
997 /*
998 * If the board falls into ec_dmi_table, it means
999 * that ECDT table gives the incorrect command/status
1000 * & data I/O address. Just fix it.
1001 */
1002 boot_ec->data_addr = ecdt_ptr->control.address;
1003 boot_ec->command_addr = ecdt_ptr->data.address;
1004 }
1005 boot_ec->gpe = ecdt_ptr->gpe;
1006 boot_ec->handle = ACPI_ROOT_OBJECT;
1007 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
1008 } else {
1009 /* This workaround is needed only on some broken machines,
1010 * which require early EC, but fail to provide ECDT */
1011 acpi_handle x;
1012 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
1013 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1014 boot_ec, NULL);
1015 /* Check that acpi_get_devices actually find something */
1016 if (ACPI_FAILURE(status) || !boot_ec->handle)
1017 goto error;
1018 /* We really need to limit this workaround, the only ASUS,
1019 * which needs it, has fake EC._INI method, so use it as flag.
1020 * Keep boot_ec struct as it will be needed soon.
1021 */
1022 if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
1023 return -ENODEV;
1024 }
1025
1026 ret = ec_install_handlers(boot_ec);
1027 if (!ret) {
1028 first_ec = boot_ec;
1029 return 0;
1030 }
1031 error:
1032 kfree(boot_ec);
1033 boot_ec = NULL;
1034 return -ENODEV;
1035 }
1036
1037 static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1038 {
1039 struct acpi_ec *ec = acpi_driver_data(device);
1040 /* Stop using GPE */
1041 set_bit(EC_FLAGS_NO_GPE, &ec->flags);
1042 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
1043 acpi_disable_gpe(NULL, ec->gpe);
1044 return 0;
1045 }
1046
1047 static int acpi_ec_resume(struct acpi_device *device)
1048 {
1049 struct acpi_ec *ec = acpi_driver_data(device);
1050 /* Enable use of GPE back */
1051 clear_bit(EC_FLAGS_NO_GPE, &ec->flags);
1052 acpi_enable_gpe(NULL, ec->gpe);
1053 return 0;
1054 }
1055
1056 static struct acpi_driver acpi_ec_driver = {
1057 .name = "ec",
1058 .class = ACPI_EC_CLASS,
1059 .ids = ec_device_ids,
1060 .ops = {
1061 .add = acpi_ec_add,
1062 .remove = acpi_ec_remove,
1063 .start = acpi_ec_start,
1064 .stop = acpi_ec_stop,
1065 .suspend = acpi_ec_suspend,
1066 .resume = acpi_ec_resume,
1067 },
1068 };
1069
1070 static int __init acpi_ec_init(void)
1071 {
1072 int result = 0;
1073
1074 if (acpi_disabled)
1075 return 0;
1076
1077 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1078 if (!acpi_ec_dir)
1079 return -ENODEV;
1080
1081 /* Now register the driver for the EC */
1082 result = acpi_bus_register_driver(&acpi_ec_driver);
1083 if (result < 0) {
1084 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1085 return -ENODEV;
1086 }
1087
1088 return result;
1089 }
1090
1091 subsys_initcall(acpi_ec_init);
1092
1093 /* EC driver currently not unloadable */
1094 #if 0
1095 static void __exit acpi_ec_exit(void)
1096 {
1097
1098 acpi_bus_unregister_driver(&acpi_ec_driver);
1099
1100 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1101
1102 return;
1103 }
1104 #endif /* 0 */