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31#define pr_fmt(fmt) "ACPI : EC: " fmt
32
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/types.h>
37#include <linux/delay.h>
38#include <linux/interrupt.h>
39#include <linux/list.h>
40#include <linux/spinlock.h>
41#include <linux/slab.h>
42#include <asm/io.h>
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45#include <linux/dmi.h>
46
47#include "internal.h"
48
49#define ACPI_EC_CLASS "embedded_controller"
50#define ACPI_EC_DEVICE_NAME "Embedded Controller"
51#define ACPI_EC_FILE_INFO "info"
52
53
54#define ACPI_EC_FLAG_OBF 0x01
55#define ACPI_EC_FLAG_IBF 0x02
56#define ACPI_EC_FLAG_BURST 0x10
57#define ACPI_EC_FLAG_SCI 0x20
58
59
60enum 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
69#define ACPI_EC_UDELAY_GLK 1000
70#define ACPI_EC_MSI_UDELAY 550
71
72enum {
73 EC_FLAGS_QUERY_PENDING,
74 EC_FLAGS_GPE_STORM,
75 EC_FLAGS_HANDLERS_INSTALLED,
76
77 EC_FLAGS_BLOCKED,
78};
79
80
81static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;
82module_param(ec_delay, uint, 0644);
83MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
84
85
86
87
88
89
90static unsigned int ec_storm_threshold __read_mostly = 8;
91module_param(ec_storm_threshold, uint, 0644);
92MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm");
93
94
95
96typedef int (*acpi_ec_query_func) (void *data);
97
98struct acpi_ec_query_handler {
99 struct list_head node;
100 acpi_ec_query_func func;
101 acpi_handle handle;
102 void *data;
103 u8 query_bit;
104};
105
106struct transaction {
107 const u8 *wdata;
108 u8 *rdata;
109 unsigned short irq_count;
110 u8 command;
111 u8 wi;
112 u8 ri;
113 u8 wlen;
114 u8 rlen;
115 bool done;
116};
117
118struct acpi_ec *boot_ec, *first_ec;
119EXPORT_SYMBOL(first_ec);
120
121static int EC_FLAGS_MSI;
122static int EC_FLAGS_VALIDATE_ECDT;
123static int EC_FLAGS_SKIP_DSDT_SCAN;
124
125
126
127
128
129static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
130{
131 u8 x = inb(ec->command_addr);
132 pr_debug("---> status = 0x%2.2x\n", x);
133 return x;
134}
135
136static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
137{
138 u8 x = inb(ec->data_addr);
139 pr_debug("---> data = 0x%2.2x\n", x);
140 return x;
141}
142
143static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
144{
145 pr_debug("<--- command = 0x%2.2x\n", command);
146 outb(command, ec->command_addr);
147}
148
149static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
150{
151 pr_debug("<--- data = 0x%2.2x\n", data);
152 outb(data, ec->data_addr);
153}
154
155static int ec_transaction_done(struct acpi_ec *ec)
156{
157 unsigned long flags;
158 int ret = 0;
159 spin_lock_irqsave(&ec->lock, flags);
160 if (!ec->curr || ec->curr->done)
161 ret = 1;
162 spin_unlock_irqrestore(&ec->lock, flags);
163 return ret;
164}
165
166static 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
173static void advance_transaction(struct acpi_ec *ec, u8 status)
174{
175 unsigned long flags;
176 struct transaction *t;
177
178 spin_lock_irqsave(&ec->lock, flags);
179 t = ec->curr;
180 if (!t)
181 goto unlock;
182 if (t->wlen > t->wi) {
183 if ((status & ACPI_EC_FLAG_IBF) == 0)
184 acpi_ec_write_data(ec,
185 t->wdata[t->wi++]);
186 else
187 goto err;
188 } else if (t->rlen > t->ri) {
189 if ((status & ACPI_EC_FLAG_OBF) == 1) {
190 t->rdata[t->ri++] = acpi_ec_read_data(ec);
191 if (t->rlen == t->ri)
192 t->done = true;
193 } else
194 goto err;
195 } else if (t->wlen == t->wi &&
196 (status & ACPI_EC_FLAG_IBF) == 0)
197 t->done = true;
198 goto unlock;
199err:
200
201
202
203
204 if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI))
205 ++t->irq_count;
206
207unlock:
208 spin_unlock_irqrestore(&ec->lock, flags);
209}
210
211static int acpi_ec_sync_query(struct acpi_ec *ec);
212
213static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
214{
215 if (state & ACPI_EC_FLAG_SCI) {
216 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
217 return acpi_ec_sync_query(ec);
218 }
219 return 0;
220}
221
222static int ec_poll(struct acpi_ec *ec)
223{
224 unsigned long flags;
225 int repeat = 5;
226 while (repeat--) {
227 unsigned long delay = jiffies +
228 msecs_to_jiffies(ec_delay);
229 do {
230
231 if (EC_FLAGS_MSI || irqs_disabled()) {
232 udelay(ACPI_EC_MSI_UDELAY);
233 if (ec_transaction_done(ec))
234 return 0;
235 } else {
236 if (wait_event_timeout(ec->wait,
237 ec_transaction_done(ec),
238 msecs_to_jiffies(1)))
239 return 0;
240 }
241 advance_transaction(ec, acpi_ec_read_status(ec));
242 } while (time_before(jiffies, delay));
243 pr_debug("controller reset, restart transaction\n");
244 spin_lock_irqsave(&ec->lock, flags);
245 start_transaction(ec);
246 spin_unlock_irqrestore(&ec->lock, flags);
247 }
248 return -ETIME;
249}
250
251static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
252 struct transaction *t)
253{
254 unsigned long tmp;
255 int ret = 0;
256 if (EC_FLAGS_MSI)
257 udelay(ACPI_EC_MSI_UDELAY);
258
259 spin_lock_irqsave(&ec->lock, tmp);
260
261 ec->curr = t;
262 start_transaction(ec);
263 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
264 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
265 spin_unlock_irqrestore(&ec->lock, tmp);
266 ret = ec_poll(ec);
267 spin_lock_irqsave(&ec->lock, tmp);
268 ec->curr = NULL;
269 spin_unlock_irqrestore(&ec->lock, tmp);
270 return ret;
271}
272
273static int ec_check_ibf0(struct acpi_ec *ec)
274{
275 u8 status = acpi_ec_read_status(ec);
276 return (status & ACPI_EC_FLAG_IBF) == 0;
277}
278
279static int ec_wait_ibf0(struct acpi_ec *ec)
280{
281 unsigned long delay = jiffies + msecs_to_jiffies(ec_delay);
282
283 while (time_before(jiffies, delay))
284 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
285 msecs_to_jiffies(1)))
286 return 0;
287 return -ETIME;
288}
289
290static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
291{
292 int status;
293 u32 glk;
294 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
295 return -EINVAL;
296 if (t->rdata)
297 memset(t->rdata, 0, t->rlen);
298 mutex_lock(&ec->mutex);
299 if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) {
300 status = -EINVAL;
301 goto unlock;
302 }
303 if (ec->global_lock) {
304 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
305 if (ACPI_FAILURE(status)) {
306 status = -ENODEV;
307 goto unlock;
308 }
309 }
310 if (ec_wait_ibf0(ec)) {
311 pr_err("input buffer is not empty, "
312 "aborting transaction\n");
313 status = -ETIME;
314 goto end;
315 }
316 pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n",
317 t->command, t->wdata ? t->wdata[0] : 0);
318
319 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
320
321 acpi_disable_gpe(NULL, ec->gpe);
322 }
323
324 status = acpi_ec_transaction_unlocked(ec, t);
325
326
327 ec_check_sci_sync(ec, acpi_ec_read_status(ec));
328 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
329 msleep(1);
330
331 acpi_enable_gpe(NULL, ec->gpe);
332 } else if (t->irq_count > ec_storm_threshold) {
333 pr_info("GPE storm detected(%d GPEs), "
334 "transactions will use polling mode\n",
335 t->irq_count);
336 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
337 }
338 pr_debug("transaction end\n");
339end:
340 if (ec->global_lock)
341 acpi_release_global_lock(glk);
342unlock:
343 mutex_unlock(&ec->mutex);
344 return status;
345}
346
347static int acpi_ec_burst_enable(struct acpi_ec *ec)
348{
349 u8 d;
350 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
351 .wdata = NULL, .rdata = &d,
352 .wlen = 0, .rlen = 1};
353
354 return acpi_ec_transaction(ec, &t);
355}
356
357static int acpi_ec_burst_disable(struct acpi_ec *ec)
358{
359 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
360 .wdata = NULL, .rdata = NULL,
361 .wlen = 0, .rlen = 0};
362
363 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
364 acpi_ec_transaction(ec, &t) : 0;
365}
366
367static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
368{
369 int result;
370 u8 d;
371 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
372 .wdata = &address, .rdata = &d,
373 .wlen = 1, .rlen = 1};
374
375 result = acpi_ec_transaction(ec, &t);
376 *data = d;
377 return result;
378}
379
380static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
381{
382 u8 wdata[2] = { address, data };
383 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
384 .wdata = wdata, .rdata = NULL,
385 .wlen = 2, .rlen = 0};
386
387 return acpi_ec_transaction(ec, &t);
388}
389
390
391
392
393int ec_burst_enable(void)
394{
395 if (!first_ec)
396 return -ENODEV;
397 return acpi_ec_burst_enable(first_ec);
398}
399
400EXPORT_SYMBOL(ec_burst_enable);
401
402int ec_burst_disable(void)
403{
404 if (!first_ec)
405 return -ENODEV;
406 return acpi_ec_burst_disable(first_ec);
407}
408
409EXPORT_SYMBOL(ec_burst_disable);
410
411int ec_read(u8 addr, u8 *val)
412{
413 int err;
414 u8 temp_data;
415
416 if (!first_ec)
417 return -ENODEV;
418
419 err = acpi_ec_read(first_ec, addr, &temp_data);
420
421 if (!err) {
422 *val = temp_data;
423 return 0;
424 } else
425 return err;
426}
427
428EXPORT_SYMBOL(ec_read);
429
430int ec_write(u8 addr, u8 val)
431{
432 int err;
433
434 if (!first_ec)
435 return -ENODEV;
436
437 err = acpi_ec_write(first_ec, addr, val);
438
439 return err;
440}
441
442EXPORT_SYMBOL(ec_write);
443
444int ec_transaction(u8 command,
445 const u8 * wdata, unsigned wdata_len,
446 u8 * rdata, unsigned rdata_len)
447{
448 struct transaction t = {.command = command,
449 .wdata = wdata, .rdata = rdata,
450 .wlen = wdata_len, .rlen = rdata_len};
451 if (!first_ec)
452 return -ENODEV;
453
454 return acpi_ec_transaction(first_ec, &t);
455}
456
457EXPORT_SYMBOL(ec_transaction);
458
459
460acpi_handle ec_get_handle(void)
461{
462 if (!first_ec)
463 return NULL;
464 return first_ec->handle;
465}
466
467EXPORT_SYMBOL(ec_get_handle);
468
469void acpi_ec_block_transactions(void)
470{
471 struct acpi_ec *ec = first_ec;
472
473 if (!ec)
474 return;
475
476 mutex_lock(&ec->mutex);
477
478 set_bit(EC_FLAGS_BLOCKED, &ec->flags);
479 mutex_unlock(&ec->mutex);
480}
481
482void acpi_ec_unblock_transactions(void)
483{
484 struct acpi_ec *ec = first_ec;
485
486 if (!ec)
487 return;
488
489 mutex_lock(&ec->mutex);
490
491 clear_bit(EC_FLAGS_BLOCKED, &ec->flags);
492 mutex_unlock(&ec->mutex);
493}
494
495void acpi_ec_unblock_transactions_early(void)
496{
497
498
499
500
501 if (first_ec)
502 clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags);
503}
504
505static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
506{
507 int result;
508 u8 d;
509 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
510 .wdata = NULL, .rdata = &d,
511 .wlen = 0, .rlen = 1};
512 if (!ec || !data)
513 return -EINVAL;
514
515
516
517
518
519 result = acpi_ec_transaction_unlocked(ec, &t);
520 if (result)
521 return result;
522 if (!d)
523 return -ENODATA;
524 *data = d;
525 return 0;
526}
527
528
529
530
531int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
532 acpi_handle handle, acpi_ec_query_func func,
533 void *data)
534{
535 struct acpi_ec_query_handler *handler =
536 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
537 if (!handler)
538 return -ENOMEM;
539
540 handler->query_bit = query_bit;
541 handler->handle = handle;
542 handler->func = func;
543 handler->data = data;
544 mutex_lock(&ec->mutex);
545 list_add(&handler->node, &ec->list);
546 mutex_unlock(&ec->mutex);
547 return 0;
548}
549
550EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
551
552void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
553{
554 struct acpi_ec_query_handler *handler, *tmp;
555 mutex_lock(&ec->mutex);
556 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
557 if (query_bit == handler->query_bit) {
558 list_del(&handler->node);
559 kfree(handler);
560 }
561 }
562 mutex_unlock(&ec->mutex);
563}
564
565EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
566
567static void acpi_ec_run(void *cxt)
568{
569 struct acpi_ec_query_handler *handler = cxt;
570 if (!handler)
571 return;
572 pr_debug("start query execution\n");
573 if (handler->func)
574 handler->func(handler->data);
575 else if (handler->handle)
576 acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
577 pr_debug("stop query execution\n");
578 kfree(handler);
579}
580
581static int acpi_ec_sync_query(struct acpi_ec *ec)
582{
583 u8 value = 0;
584 int status;
585 struct acpi_ec_query_handler *handler, *copy;
586 if ((status = acpi_ec_query_unlocked(ec, &value)))
587 return status;
588 list_for_each_entry(handler, &ec->list, node) {
589 if (value == handler->query_bit) {
590
591 copy = kmalloc(sizeof(*handler), GFP_KERNEL);
592 if (!copy)
593 return -ENOMEM;
594 memcpy(copy, handler, sizeof(*copy));
595 pr_debug("push query execution (0x%2x) on queue\n",
596 value);
597 return acpi_os_execute((copy->func) ?
598 OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
599 acpi_ec_run, copy);
600 }
601 }
602 return 0;
603}
604
605static void acpi_ec_gpe_query(void *ec_cxt)
606{
607 struct acpi_ec *ec = ec_cxt;
608 if (!ec)
609 return;
610 mutex_lock(&ec->mutex);
611 acpi_ec_sync_query(ec);
612 mutex_unlock(&ec->mutex);
613}
614
615static int ec_check_sci(struct acpi_ec *ec, u8 state)
616{
617 if (state & ACPI_EC_FLAG_SCI) {
618 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
619 pr_debug("push gpe query to the queue\n");
620 return acpi_os_execute(OSL_NOTIFY_HANDLER,
621 acpi_ec_gpe_query, ec);
622 }
623 }
624 return 0;
625}
626
627static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
628 u32 gpe_number, void *data)
629{
630 struct acpi_ec *ec = data;
631 u8 status = acpi_ec_read_status(ec);
632
633 pr_debug("~~~> interrupt, status:0x%02x\n", status);
634
635 advance_transaction(ec, status);
636 if (ec_transaction_done(ec) &&
637 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
638 wake_up(&ec->wait);
639 ec_check_sci(ec, acpi_ec_read_status(ec));
640 }
641 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
642}
643
644
645
646
647
648static acpi_status
649acpi_ec_space_handler(u32 function, acpi_physical_address address,
650 u32 bits, u64 *value64,
651 void *handler_context, void *region_context)
652{
653 struct acpi_ec *ec = handler_context;
654 int result = 0, i, bytes = bits / 8;
655 u8 *value = (u8 *)value64;
656
657 if ((address > 0xFF) || !value || !handler_context)
658 return AE_BAD_PARAMETER;
659
660 if (function != ACPI_READ && function != ACPI_WRITE)
661 return AE_BAD_PARAMETER;
662
663 if (EC_FLAGS_MSI || bits > 8)
664 acpi_ec_burst_enable(ec);
665
666 for (i = 0; i < bytes; ++i, ++address, ++value)
667 result = (function == ACPI_READ) ?
668 acpi_ec_read(ec, address, value) :
669 acpi_ec_write(ec, address, *value);
670
671 if (EC_FLAGS_MSI || bits > 8)
672 acpi_ec_burst_disable(ec);
673
674 switch (result) {
675 case -EINVAL:
676 return AE_BAD_PARAMETER;
677 break;
678 case -ENODEV:
679 return AE_NOT_FOUND;
680 break;
681 case -ETIME:
682 return AE_TIME;
683 break;
684 default:
685 return AE_OK;
686 }
687}
688
689
690
691
692static acpi_status
693ec_parse_io_ports(struct acpi_resource *resource, void *context);
694
695static struct acpi_ec *make_acpi_ec(void)
696{
697 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
698 if (!ec)
699 return NULL;
700 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
701 mutex_init(&ec->mutex);
702 init_waitqueue_head(&ec->wait);
703 INIT_LIST_HEAD(&ec->list);
704 spin_lock_init(&ec->lock);
705 return ec;
706}
707
708static acpi_status
709acpi_ec_register_query_methods(acpi_handle handle, u32 level,
710 void *context, void **return_value)
711{
712 char node_name[5];
713 struct acpi_buffer buffer = { sizeof(node_name), node_name };
714 struct acpi_ec *ec = context;
715 int value = 0;
716 acpi_status status;
717
718 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
719
720 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
721 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
722 }
723 return AE_OK;
724}
725
726static acpi_status
727ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
728{
729 acpi_status status;
730 unsigned long long tmp = 0;
731
732 struct acpi_ec *ec = context;
733
734
735 ec->command_addr = ec->data_addr = 0;
736
737 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
738 ec_parse_io_ports, ec);
739 if (ACPI_FAILURE(status))
740 return status;
741
742
743
744 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
745 if (ACPI_FAILURE(status))
746 return status;
747 ec->gpe = tmp;
748
749 tmp = 0;
750 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
751 ec->global_lock = tmp;
752 ec->handle = handle;
753 return AE_CTRL_TERMINATE;
754}
755
756static int ec_install_handlers(struct acpi_ec *ec)
757{
758 acpi_status status;
759 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
760 return 0;
761 status = acpi_install_gpe_handler(NULL, ec->gpe,
762 ACPI_GPE_EDGE_TRIGGERED,
763 &acpi_ec_gpe_handler, ec);
764 if (ACPI_FAILURE(status))
765 return -ENODEV;
766
767 acpi_enable_gpe(NULL, ec->gpe);
768 status = acpi_install_address_space_handler(ec->handle,
769 ACPI_ADR_SPACE_EC,
770 &acpi_ec_space_handler,
771 NULL, ec);
772 if (ACPI_FAILURE(status)) {
773 if (status == AE_NOT_FOUND) {
774
775
776
777
778
779 pr_err("Fail in evaluating the _REG object"
780 " of EC device. Broken bios is suspected.\n");
781 } else {
782 acpi_remove_gpe_handler(NULL, ec->gpe,
783 &acpi_ec_gpe_handler);
784 acpi_disable_gpe(NULL, ec->gpe);
785 return -ENODEV;
786 }
787 }
788
789 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
790 return 0;
791}
792
793static void ec_remove_handlers(struct acpi_ec *ec)
794{
795 acpi_disable_gpe(NULL, ec->gpe);
796 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
797 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
798 pr_err("failed to remove space handler\n");
799 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
800 &acpi_ec_gpe_handler)))
801 pr_err("failed to remove gpe handler\n");
802 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
803}
804
805static int acpi_ec_add(struct acpi_device *device)
806{
807 struct acpi_ec *ec = NULL;
808 int ret;
809
810 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
811 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
812
813
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 }
824 if (ec_parse_device(device->handle, 0, ec, NULL) !=
825 AE_CTRL_TERMINATE) {
826 kfree(ec);
827 return -EINVAL;
828 }
829
830
831 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
832 acpi_ec_register_query_methods, NULL, ec, NULL);
833
834 if (!first_ec)
835 first_ec = ec;
836 device->driver_data = ec;
837
838 ret = !!request_region(ec->data_addr, 1, "EC data");
839 WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr);
840 ret = !!request_region(ec->command_addr, 1, "EC cmd");
841 WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
842
843 pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
844 ec->gpe, ec->command_addr, ec->data_addr);
845
846 ret = ec_install_handlers(ec);
847
848
849 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
850 return ret;
851}
852
853static int acpi_ec_remove(struct acpi_device *device)
854{
855 struct acpi_ec *ec;
856 struct acpi_ec_query_handler *handler, *tmp;
857
858 if (!device)
859 return -EINVAL;
860
861 ec = acpi_driver_data(device);
862 ec_remove_handlers(ec);
863 mutex_lock(&ec->mutex);
864 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
865 list_del(&handler->node);
866 kfree(handler);
867 }
868 mutex_unlock(&ec->mutex);
869 release_region(ec->data_addr, 1);
870 release_region(ec->command_addr, 1);
871 device->driver_data = NULL;
872 if (ec == first_ec)
873 first_ec = NULL;
874 kfree(ec);
875 return 0;
876}
877
878static acpi_status
879ec_parse_io_ports(struct acpi_resource *resource, void *context)
880{
881 struct acpi_ec *ec = context;
882
883 if (resource->type != ACPI_RESOURCE_TYPE_IO)
884 return AE_OK;
885
886
887
888
889
890
891 if (ec->data_addr == 0)
892 ec->data_addr = resource->data.io.minimum;
893 else if (ec->command_addr == 0)
894 ec->command_addr = resource->data.io.minimum;
895 else
896 return AE_CTRL_TERMINATE;
897
898 return AE_OK;
899}
900
901int __init acpi_boot_ec_enable(void)
902{
903 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
904 return 0;
905 if (!ec_install_handlers(boot_ec)) {
906 first_ec = boot_ec;
907 return 0;
908 }
909 return -EFAULT;
910}
911
912static const struct acpi_device_id ec_device_ids[] = {
913 {"PNP0C09", 0},
914 {"", 0},
915};
916
917
918static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
919{
920 EC_FLAGS_SKIP_DSDT_SCAN = 1;
921 return 0;
922}
923
924
925static int ec_validate_ecdt(const struct dmi_system_id *id)
926{
927 EC_FLAGS_VALIDATE_ECDT = 1;
928 return 0;
929}
930
931
932static int ec_flag_msi(const struct dmi_system_id *id)
933{
934 pr_debug("Detected MSI hardware, enabling workarounds.\n");
935 EC_FLAGS_MSI = 1;
936 EC_FLAGS_VALIDATE_ECDT = 1;
937 return 0;
938}
939
940
941
942
943
944static int ec_enlarge_storm_threshold(const struct dmi_system_id *id)
945{
946 pr_debug("Setting the EC GPE storm threshold to 20\n");
947 ec_storm_threshold = 20;
948 return 0;
949}
950
951static struct dmi_system_id ec_dmi_table[] __initdata = {
952 {
953 ec_skip_dsdt_scan, "Compal JFL92", {
954 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
955 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
956 {
957 ec_flag_msi, "MSI hardware", {
958 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
959 {
960 ec_flag_msi, "MSI hardware", {
961 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
962 {
963 ec_flag_msi, "MSI hardware", {
964 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
965 {
966 ec_flag_msi, "MSI hardware", {
967 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL},
968 {
969 ec_flag_msi, "Quanta hardware", {
970 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
971 DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL},
972 {
973 ec_flag_msi, "Quanta hardware", {
974 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
975 DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL},
976 {
977 ec_validate_ecdt, "ASUS hardware", {
978 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
979 {
980 ec_validate_ecdt, "ASUS hardware", {
981 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL},
982 {
983 ec_enlarge_storm_threshold, "CLEVO hardware", {
984 DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
985 DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL},
986 {
987 ec_skip_dsdt_scan, "HP Folio 13", {
988 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
989 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL},
990 {
991 ec_validate_ecdt, "ASUS hardware", {
992 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."),
993 DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL},
994 {},
995};
996
997int __init acpi_ec_ecdt_probe(void)
998{
999 acpi_status status;
1000 struct acpi_ec *saved_ec = NULL;
1001 struct acpi_table_ecdt *ecdt_ptr;
1002
1003 boot_ec = make_acpi_ec();
1004 if (!boot_ec)
1005 return -ENOMEM;
1006
1007
1008
1009 dmi_check_system(ec_dmi_table);
1010 status = acpi_get_table(ACPI_SIG_ECDT, 1,
1011 (struct acpi_table_header **)&ecdt_ptr);
1012 if (ACPI_SUCCESS(status)) {
1013 pr_info("EC description table is found, configuring boot EC\n");
1014 boot_ec->command_addr = ecdt_ptr->control.address;
1015 boot_ec->data_addr = ecdt_ptr->data.address;
1016 boot_ec->gpe = ecdt_ptr->gpe;
1017 boot_ec->handle = ACPI_ROOT_OBJECT;
1018 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
1019
1020 if (!EC_FLAGS_VALIDATE_ECDT)
1021 goto install;
1022 saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL);
1023 if (!saved_ec)
1024 return -ENOMEM;
1025
1026 }
1027
1028 if (EC_FLAGS_SKIP_DSDT_SCAN)
1029 return -ENODEV;
1030
1031
1032
1033 pr_debug("Look up EC in DSDT\n");
1034 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
1035 boot_ec, NULL);
1036
1037 if (ACPI_FAILURE(status) || !boot_ec->handle)
1038 goto error;
1039 if (saved_ec) {
1040
1041 if (saved_ec->command_addr != boot_ec->command_addr ||
1042 saved_ec->data_addr != boot_ec->data_addr ||
1043 saved_ec->gpe != boot_ec->gpe ||
1044 saved_ec->handle != boot_ec->handle)
1045 pr_info("ASUSTek keeps feeding us with broken "
1046 "ECDT tables, which are very hard to workaround. "
1047 "Trying to use DSDT EC info instead. Please send "
1048 "output of acpidump to linux-acpi@vger.kernel.org\n");
1049 kfree(saved_ec);
1050 saved_ec = NULL;
1051 } else {
1052
1053
1054
1055
1056 if (!dmi_name_in_vendors("ASUS") ||
1057 !acpi_has_method(boot_ec->handle, "_INI"))
1058 return -ENODEV;
1059 }
1060install:
1061 if (!ec_install_handlers(boot_ec)) {
1062 first_ec = boot_ec;
1063 return 0;
1064 }
1065error:
1066 kfree(boot_ec);
1067 boot_ec = NULL;
1068 return -ENODEV;
1069}
1070
1071static struct acpi_driver acpi_ec_driver = {
1072 .name = "ec",
1073 .class = ACPI_EC_CLASS,
1074 .ids = ec_device_ids,
1075 .ops = {
1076 .add = acpi_ec_add,
1077 .remove = acpi_ec_remove,
1078 },
1079};
1080
1081int __init acpi_ec_init(void)
1082{
1083 int result = 0;
1084
1085
1086 result = acpi_bus_register_driver(&acpi_ec_driver);
1087 if (result < 0)
1088 return -ENODEV;
1089
1090 return result;
1091}
1092
1093
1094#if 0
1095static void __exit acpi_ec_exit(void)
1096{
1097
1098 acpi_bus_unregister_driver(&acpi_ec_driver);
1099 return;
1100}
1101#endif
1102