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32#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/types.h>
36#include <linux/delay.h>
37#include <linux/proc_fs.h>
38#include <linux/seq_file.h>
39#include <linux/interrupt.h>
40#include <linux/list.h>
41#include <linux/spinlock.h>
42#include <asm/io.h>
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45#include <linux/dmi.h>
46
47#define ACPI_EC_CLASS "embedded_controller"
48#define ACPI_EC_DEVICE_NAME "Embedded Controller"
49#define ACPI_EC_FILE_INFO "info"
50
51#define PREFIX "ACPI: EC: "
52
53
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_CDELAY 10
71#define ACPI_EC_MSI_UDELAY 550
72
73#define ACPI_EC_STORM_THRESHOLD 8
74
75
76enum {
77 EC_FLAGS_QUERY_PENDING,
78 EC_FLAGS_GPE_STORM,
79 EC_FLAGS_HANDLERS_INSTALLED
80
81};
82
83
84
85typedef int (*acpi_ec_query_func) (void *data);
86
87struct acpi_ec_query_handler {
88 struct list_head node;
89 acpi_ec_query_func func;
90 acpi_handle handle;
91 void *data;
92 u8 query_bit;
93};
94
95struct transaction {
96 const u8 *wdata;
97 u8 *rdata;
98 unsigned short irq_count;
99 u8 command;
100 u8 wi;
101 u8 ri;
102 u8 wlen;
103 u8 rlen;
104 bool done;
105};
106
107static struct acpi_ec {
108 acpi_handle handle;
109 unsigned long gpe;
110 unsigned long command_addr;
111 unsigned long data_addr;
112 unsigned long global_lock;
113 unsigned long flags;
114 struct mutex lock;
115 wait_queue_head_t wait;
116 struct list_head list;
117 struct transaction *curr;
118 spinlock_t curr_lock;
119} *boot_ec, *first_ec;
120
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(PREFIX "---> 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(PREFIX "---> 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(PREFIX "<--- 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(PREFIX "<--- 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->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
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 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;
196err:
197
198 if (in_interrupt())
199 ++ec->curr->irq_count;
200unlock:
201 spin_unlock_irqrestore(&ec->curr_lock, flags);
202}
203
204static void acpi_ec_gpe_query(void *ec_cxt);
205
206static int ec_check_sci(struct acpi_ec *ec, u8 state)
207{
208 if (state & ACPI_EC_FLAG_SCI) {
209 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
210 return acpi_os_execute(OSL_EC_BURST_HANDLER,
211 acpi_ec_gpe_query, ec);
212 }
213 return 0;
214}
215
216static int ec_poll(struct acpi_ec *ec)
217{
218 unsigned long flags;
219 int repeat = 2;
220 while (repeat--) {
221 unsigned long delay = jiffies +
222 msecs_to_jiffies(ACPI_EC_DELAY);
223 do {
224
225 if (EC_FLAGS_MSI || irqs_disabled()) {
226 udelay(ACPI_EC_MSI_UDELAY);
227 if (ec_transaction_done(ec))
228 return 0;
229 } else {
230 if (wait_event_timeout(ec->wait,
231 ec_transaction_done(ec),
232 msecs_to_jiffies(1)))
233 return 0;
234 }
235 advance_transaction(ec, acpi_ec_read_status(ec));
236 } while (time_before(jiffies, delay));
237 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
238 break;
239 pr_debug(PREFIX "controller reset, restart transaction\n");
240 spin_lock_irqsave(&ec->curr_lock, flags);
241 start_transaction(ec);
242 spin_unlock_irqrestore(&ec->curr_lock, flags);
243 }
244 return -ETIME;
245}
246
247static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
248 struct transaction *t)
249{
250 unsigned long tmp;
251 int ret = 0;
252 pr_debug(PREFIX "transaction start\n");
253
254 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
255 acpi_disable_gpe(NULL, ec->gpe);
256 }
257 if (EC_FLAGS_MSI)
258 udelay(ACPI_EC_MSI_UDELAY);
259
260 spin_lock_irqsave(&ec->curr_lock, tmp);
261
262 ec->curr = t;
263 start_transaction(ec);
264 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
265 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
266 spin_unlock_irqrestore(&ec->curr_lock, tmp);
267 ret = ec_poll(ec);
268 pr_debug(PREFIX "transaction end\n");
269 spin_lock_irqsave(&ec->curr_lock, tmp);
270 ec->curr = NULL;
271 spin_unlock_irqrestore(&ec->curr_lock, tmp);
272 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
273
274 ec_check_sci(ec, acpi_ec_read_status(ec));
275
276 acpi_enable_gpe(NULL, ec->gpe);
277 } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
278 pr_info(PREFIX "GPE storm detected, "
279 "transactions will use polling mode\n");
280 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
281 }
282 return ret;
283}
284
285static int ec_check_ibf0(struct acpi_ec *ec)
286{
287 u8 status = acpi_ec_read_status(ec);
288 return (status & ACPI_EC_FLAG_IBF) == 0;
289}
290
291static int ec_wait_ibf0(struct acpi_ec *ec)
292{
293 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
294
295 while (time_before(jiffies, delay))
296 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
297 msecs_to_jiffies(1)))
298 return 0;
299 return -ETIME;
300}
301
302static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
303{
304 int status;
305 u32 glk;
306 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
307 return -EINVAL;
308 if (t->rdata)
309 memset(t->rdata, 0, t->rlen);
310 mutex_lock(&ec->lock);
311 if (ec->global_lock) {
312 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
313 if (ACPI_FAILURE(status)) {
314 status = -ENODEV;
315 goto unlock;
316 }
317 }
318 if (ec_wait_ibf0(ec)) {
319 pr_err(PREFIX "input buffer is not empty, "
320 "aborting transaction\n");
321 status = -ETIME;
322 goto end;
323 }
324 status = acpi_ec_transaction_unlocked(ec, t);
325end:
326 if (ec->global_lock)
327 acpi_release_global_lock(glk);
328unlock:
329 mutex_unlock(&ec->lock);
330 return status;
331}
332
333static int acpi_ec_burst_enable(struct acpi_ec *ec)
334{
335 u8 d;
336 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
337 .wdata = NULL, .rdata = &d,
338 .wlen = 0, .rlen = 1};
339
340 return acpi_ec_transaction(ec, &t);
341}
342
343static int acpi_ec_burst_disable(struct acpi_ec *ec)
344{
345 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
346 .wdata = NULL, .rdata = NULL,
347 .wlen = 0, .rlen = 0};
348
349 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
350 acpi_ec_transaction(ec, &t) : 0;
351}
352
353static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
354{
355 int result;
356 u8 d;
357 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
358 .wdata = &address, .rdata = &d,
359 .wlen = 1, .rlen = 1};
360
361 result = acpi_ec_transaction(ec, &t);
362 *data = d;
363 return result;
364}
365
366static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
367{
368 u8 wdata[2] = { address, data };
369 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
370 .wdata = wdata, .rdata = NULL,
371 .wlen = 2, .rlen = 0};
372
373 return acpi_ec_transaction(ec, &t);
374}
375
376
377
378
379int ec_burst_enable(void)
380{
381 if (!first_ec)
382 return -ENODEV;
383 return acpi_ec_burst_enable(first_ec);
384}
385
386EXPORT_SYMBOL(ec_burst_enable);
387
388int ec_burst_disable(void)
389{
390 if (!first_ec)
391 return -ENODEV;
392 return acpi_ec_burst_disable(first_ec);
393}
394
395EXPORT_SYMBOL(ec_burst_disable);
396
397int ec_read(u8 addr, u8 * val)
398{
399 int err;
400 u8 temp_data;
401
402 if (!first_ec)
403 return -ENODEV;
404
405 err = acpi_ec_read(first_ec, addr, &temp_data);
406
407 if (!err) {
408 *val = temp_data;
409 return 0;
410 } else
411 return err;
412}
413
414EXPORT_SYMBOL(ec_read);
415
416int ec_write(u8 addr, u8 val)
417{
418 int err;
419
420 if (!first_ec)
421 return -ENODEV;
422
423 err = acpi_ec_write(first_ec, addr, val);
424
425 return err;
426}
427
428EXPORT_SYMBOL(ec_write);
429
430int ec_transaction(u8 command,
431 const u8 * wdata, unsigned wdata_len,
432 u8 * rdata, unsigned rdata_len,
433 int force_poll)
434{
435 struct transaction t = {.command = command,
436 .wdata = wdata, .rdata = rdata,
437 .wlen = wdata_len, .rlen = rdata_len};
438 if (!first_ec)
439 return -ENODEV;
440
441 return acpi_ec_transaction(first_ec, &t);
442}
443
444EXPORT_SYMBOL(ec_transaction);
445
446static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
447{
448 int result;
449 u8 d;
450 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
451 .wdata = NULL, .rdata = &d,
452 .wlen = 0, .rlen = 1};
453 if (!ec || !data)
454 return -EINVAL;
455
456
457
458
459
460
461
462 result = acpi_ec_transaction(ec, &t);
463 if (result)
464 return result;
465
466 if (!d)
467 return -ENODATA;
468
469 *data = d;
470 return 0;
471}
472
473
474
475
476int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
477 acpi_handle handle, acpi_ec_query_func func,
478 void *data)
479{
480 struct acpi_ec_query_handler *handler =
481 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
482 if (!handler)
483 return -ENOMEM;
484
485 handler->query_bit = query_bit;
486 handler->handle = handle;
487 handler->func = func;
488 handler->data = data;
489 mutex_lock(&ec->lock);
490 list_add(&handler->node, &ec->list);
491 mutex_unlock(&ec->lock);
492 return 0;
493}
494
495EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
496
497void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
498{
499 struct acpi_ec_query_handler *handler, *tmp;
500 mutex_lock(&ec->lock);
501 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
502 if (query_bit == handler->query_bit) {
503 list_del(&handler->node);
504 kfree(handler);
505 }
506 }
507 mutex_unlock(&ec->lock);
508}
509
510EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
511
512static void acpi_ec_gpe_query(void *ec_cxt)
513{
514 struct acpi_ec *ec = ec_cxt;
515 u8 value = 0;
516 struct acpi_ec_query_handler *handler, copy;
517
518 if (!ec || acpi_ec_query(ec, &value))
519 return;
520 mutex_lock(&ec->lock);
521 list_for_each_entry(handler, &ec->list, node) {
522 if (value == handler->query_bit) {
523
524 memcpy(©, handler, sizeof(copy));
525 mutex_unlock(&ec->lock);
526 if (copy.func) {
527 copy.func(copy.data);
528 } else if (copy.handle) {
529 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
530 }
531 return;
532 }
533 }
534 mutex_unlock(&ec->lock);
535}
536
537static u32 acpi_ec_gpe_handler(void *data)
538{
539 struct acpi_ec *ec = data;
540 u8 status;
541
542 pr_debug(PREFIX "~~~> interrupt\n");
543 status = acpi_ec_read_status(ec);
544
545 advance_transaction(ec, status);
546 if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0)
547 wake_up(&ec->wait);
548 ec_check_sci(ec, status);
549 return ACPI_INTERRUPT_HANDLED;
550}
551
552
553
554
555
556static acpi_status
557acpi_ec_space_handler(u32 function, acpi_physical_address address,
558 u32 bits, acpi_integer *value,
559 void *handler_context, void *region_context)
560{
561 struct acpi_ec *ec = handler_context;
562 int result = 0, i;
563 u8 temp = 0;
564
565 if ((address > 0xFF) || !value || !handler_context)
566 return AE_BAD_PARAMETER;
567
568 if (function != ACPI_READ && function != ACPI_WRITE)
569 return AE_BAD_PARAMETER;
570
571 if (bits != 8 && acpi_strict)
572 return AE_BAD_PARAMETER;
573
574 if (EC_FLAGS_MSI)
575 acpi_ec_burst_enable(ec);
576
577 if (function == ACPI_READ) {
578 result = acpi_ec_read(ec, address, &temp);
579 *value = temp;
580 } else {
581 temp = 0xff & (*value);
582 result = acpi_ec_write(ec, address, temp);
583 }
584
585 for (i = 8; unlikely(bits - i > 0); i += 8) {
586 ++address;
587 if (function == ACPI_READ) {
588 result = acpi_ec_read(ec, address, &temp);
589 (*value) |= ((acpi_integer)temp) << i;
590 } else {
591 temp = 0xff & ((*value) >> i);
592 result = acpi_ec_write(ec, address, temp);
593 }
594 }
595
596 if (EC_FLAGS_MSI)
597 acpi_ec_burst_disable(ec);
598
599 switch (result) {
600 case -EINVAL:
601 return AE_BAD_PARAMETER;
602 break;
603 case -ENODEV:
604 return AE_NOT_FOUND;
605 break;
606 case -ETIME:
607 return AE_TIME;
608 break;
609 default:
610 return AE_OK;
611 }
612}
613
614
615
616
617
618static struct proc_dir_entry *acpi_ec_dir;
619
620static int acpi_ec_read_info(struct seq_file *seq, void *offset)
621{
622 struct acpi_ec *ec = seq->private;
623
624 if (!ec)
625 goto end;
626
627 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
628 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
629 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
630 seq_printf(seq, "use global lock:\t%s\n",
631 ec->global_lock ? "yes" : "no");
632 end:
633 return 0;
634}
635
636static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
637{
638 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
639}
640
641static const struct file_operations acpi_ec_info_ops = {
642 .open = acpi_ec_info_open_fs,
643 .read = seq_read,
644 .llseek = seq_lseek,
645 .release = single_release,
646 .owner = THIS_MODULE,
647};
648
649static int acpi_ec_add_fs(struct acpi_device *device)
650{
651 struct proc_dir_entry *entry = NULL;
652
653 if (!acpi_device_dir(device)) {
654 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
655 acpi_ec_dir);
656 if (!acpi_device_dir(device))
657 return -ENODEV;
658 }
659
660 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
661 acpi_device_dir(device),
662 &acpi_ec_info_ops, acpi_driver_data(device));
663 if (!entry)
664 return -ENODEV;
665 return 0;
666}
667
668static int acpi_ec_remove_fs(struct acpi_device *device)
669{
670
671 if (acpi_device_dir(device)) {
672 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
673 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
674 acpi_device_dir(device) = NULL;
675 }
676
677 return 0;
678}
679
680
681
682
683static acpi_status
684ec_parse_io_ports(struct acpi_resource *resource, void *context);
685
686static struct acpi_ec *make_acpi_ec(void)
687{
688 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
689 if (!ec)
690 return NULL;
691 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
692 mutex_init(&ec->lock);
693 init_waitqueue_head(&ec->wait);
694 INIT_LIST_HEAD(&ec->list);
695 spin_lock_init(&ec->curr_lock);
696 return ec;
697}
698
699static acpi_status
700acpi_ec_register_query_methods(acpi_handle handle, u32 level,
701 void *context, void **return_value)
702{
703 char node_name[5];
704 struct acpi_buffer buffer = { sizeof(node_name), node_name };
705 struct acpi_ec *ec = context;
706 int value = 0;
707 acpi_status status;
708
709 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
710
711 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
712 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
713 }
714 return AE_OK;
715}
716
717static acpi_status
718ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
719{
720 acpi_status status;
721 unsigned long long tmp = 0;
722
723 struct acpi_ec *ec = context;
724
725
726 ec->command_addr = ec->data_addr = 0;
727
728 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
729 ec_parse_io_ports, ec);
730 if (ACPI_FAILURE(status))
731 return status;
732
733
734
735 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
736 if (ACPI_FAILURE(status))
737 return status;
738 ec->gpe = tmp;
739
740 tmp = 0;
741 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
742 ec->global_lock = tmp;
743 ec->handle = handle;
744 return AE_CTRL_TERMINATE;
745}
746
747static int ec_install_handlers(struct acpi_ec *ec)
748{
749 acpi_status status;
750 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
751 return 0;
752 status = acpi_install_gpe_handler(NULL, ec->gpe,
753 ACPI_GPE_EDGE_TRIGGERED,
754 &acpi_ec_gpe_handler, ec);
755 if (ACPI_FAILURE(status))
756 return -ENODEV;
757 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
758 acpi_enable_gpe(NULL, ec->gpe);
759 status = acpi_install_address_space_handler(ec->handle,
760 ACPI_ADR_SPACE_EC,
761 &acpi_ec_space_handler,
762 NULL, ec);
763 if (ACPI_FAILURE(status)) {
764 if (status == AE_NOT_FOUND) {
765
766
767
768
769
770 printk(KERN_ERR "Fail in evaluating the _REG object"
771 " of EC device. Broken bios is suspected.\n");
772 } else {
773 acpi_remove_gpe_handler(NULL, ec->gpe,
774 &acpi_ec_gpe_handler);
775 return -ENODEV;
776 }
777 }
778
779 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
780 return 0;
781}
782
783static void ec_remove_handlers(struct acpi_ec *ec)
784{
785 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
786 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
787 pr_err(PREFIX "failed to remove space handler\n");
788 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
789 &acpi_ec_gpe_handler)))
790 pr_err(PREFIX "failed to remove gpe handler\n");
791 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
792}
793
794static int acpi_ec_add(struct acpi_device *device)
795{
796 struct acpi_ec *ec = NULL;
797 int ret;
798
799 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
800 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
801
802
803 if (boot_ec &&
804 (boot_ec->handle == device->handle ||
805 boot_ec->handle == ACPI_ROOT_OBJECT)) {
806 ec = boot_ec;
807 boot_ec = NULL;
808 } else {
809 ec = make_acpi_ec();
810 if (!ec)
811 return -ENOMEM;
812 }
813 if (ec_parse_device(device->handle, 0, ec, NULL) !=
814 AE_CTRL_TERMINATE) {
815 kfree(ec);
816 return -EINVAL;
817 }
818
819 ec->handle = device->handle;
820
821
822 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
823 acpi_ec_register_query_methods, ec, NULL);
824
825 if (!first_ec)
826 first_ec = ec;
827 device->driver_data = ec;
828 acpi_ec_add_fs(device);
829 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
830 ec->gpe, ec->command_addr, ec->data_addr);
831
832 ret = ec_install_handlers(ec);
833
834
835 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
836 return ret;
837}
838
839static int acpi_ec_remove(struct acpi_device *device, int type)
840{
841 struct acpi_ec *ec;
842 struct acpi_ec_query_handler *handler, *tmp;
843
844 if (!device)
845 return -EINVAL;
846
847 ec = acpi_driver_data(device);
848 ec_remove_handlers(ec);
849 mutex_lock(&ec->lock);
850 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
851 list_del(&handler->node);
852 kfree(handler);
853 }
854 mutex_unlock(&ec->lock);
855 acpi_ec_remove_fs(device);
856 device->driver_data = NULL;
857 if (ec == first_ec)
858 first_ec = NULL;
859 kfree(ec);
860 return 0;
861}
862
863static acpi_status
864ec_parse_io_ports(struct acpi_resource *resource, void *context)
865{
866 struct acpi_ec *ec = context;
867
868 if (resource->type != ACPI_RESOURCE_TYPE_IO)
869 return AE_OK;
870
871
872
873
874
875
876 if (ec->data_addr == 0)
877 ec->data_addr = resource->data.io.minimum;
878 else if (ec->command_addr == 0)
879 ec->command_addr = resource->data.io.minimum;
880 else
881 return AE_CTRL_TERMINATE;
882
883 return AE_OK;
884}
885
886int __init acpi_boot_ec_enable(void)
887{
888 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
889 return 0;
890 if (!ec_install_handlers(boot_ec)) {
891 first_ec = boot_ec;
892 return 0;
893 }
894 return -EFAULT;
895}
896
897static const struct acpi_device_id ec_device_ids[] = {
898 {"PNP0C09", 0},
899 {"", 0},
900};
901
902
903static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
904{
905 EC_FLAGS_SKIP_DSDT_SCAN = 1;
906 return 0;
907}
908
909
910static int ec_validate_ecdt(const struct dmi_system_id *id)
911{
912 EC_FLAGS_VALIDATE_ECDT = 1;
913 return 0;
914}
915
916
917static int ec_flag_msi(const struct dmi_system_id *id)
918{
919 EC_FLAGS_MSI = 1;
920 EC_FLAGS_VALIDATE_ECDT = 1;
921 return 0;
922}
923
924static struct dmi_system_id __initdata ec_dmi_table[] = {
925 {
926 ec_skip_dsdt_scan, "Compal JFL92", {
927 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
928 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
929 {
930 ec_flag_msi, "MSI hardware", {
931 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star"),
932 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star") }, NULL},
933 {
934 ec_validate_ecdt, "ASUS hardware", {
935 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
936 {},
937};
938
939
940int __init acpi_ec_ecdt_probe(void)
941{
942 acpi_status status;
943 struct acpi_ec *saved_ec = NULL;
944 struct acpi_table_ecdt *ecdt_ptr;
945
946 boot_ec = make_acpi_ec();
947 if (!boot_ec)
948 return -ENOMEM;
949
950
951
952 dmi_check_system(ec_dmi_table);
953 status = acpi_get_table(ACPI_SIG_ECDT, 1,
954 (struct acpi_table_header **)&ecdt_ptr);
955 if (ACPI_SUCCESS(status)) {
956 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
957 boot_ec->command_addr = ecdt_ptr->control.address;
958 boot_ec->data_addr = ecdt_ptr->data.address;
959 boot_ec->gpe = ecdt_ptr->gpe;
960 boot_ec->handle = ACPI_ROOT_OBJECT;
961 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
962
963 if (!EC_FLAGS_VALIDATE_ECDT)
964 goto install;
965 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
966 if (!saved_ec)
967 return -ENOMEM;
968 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
969
970 }
971
972 if (EC_FLAGS_SKIP_DSDT_SCAN)
973 return -ENODEV;
974
975
976
977 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
978 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
979 boot_ec, NULL);
980
981 if (ACPI_FAILURE(status) || !boot_ec->handle)
982 goto error;
983 if (saved_ec) {
984
985 if (saved_ec->command_addr != boot_ec->command_addr ||
986 saved_ec->data_addr != boot_ec->data_addr ||
987 saved_ec->gpe != boot_ec->gpe ||
988 saved_ec->handle != boot_ec->handle)
989 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
990 "ECDT tables, which are very hard to workaround. "
991 "Trying to use DSDT EC info instead. Please send "
992 "output of acpidump to linux-acpi@vger.kernel.org\n");
993 kfree(saved_ec);
994 saved_ec = NULL;
995 } else {
996
997
998
999
1000 acpi_handle dummy;
1001 if (!dmi_name_in_vendors("ASUS") ||
1002 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1003 &dummy)))
1004 return -ENODEV;
1005 }
1006install:
1007 if (!ec_install_handlers(boot_ec)) {
1008 first_ec = boot_ec;
1009 return 0;
1010 }
1011error:
1012 kfree(boot_ec);
1013 boot_ec = NULL;
1014 return -ENODEV;
1015}
1016
1017static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
1018{
1019 struct acpi_ec *ec = acpi_driver_data(device);
1020
1021 acpi_disable_gpe(NULL, ec->gpe);
1022 return 0;
1023}
1024
1025static int acpi_ec_resume(struct acpi_device *device)
1026{
1027 struct acpi_ec *ec = acpi_driver_data(device);
1028
1029 acpi_enable_gpe(NULL, ec->gpe);
1030 return 0;
1031}
1032
1033static struct acpi_driver acpi_ec_driver = {
1034 .name = "ec",
1035 .class = ACPI_EC_CLASS,
1036 .ids = ec_device_ids,
1037 .ops = {
1038 .add = acpi_ec_add,
1039 .remove = acpi_ec_remove,
1040 .suspend = acpi_ec_suspend,
1041 .resume = acpi_ec_resume,
1042 },
1043};
1044
1045int __init acpi_ec_init(void)
1046{
1047 int result = 0;
1048
1049 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1050 if (!acpi_ec_dir)
1051 return -ENODEV;
1052
1053
1054 result = acpi_bus_register_driver(&acpi_ec_driver);
1055 if (result < 0) {
1056 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1057 return -ENODEV;
1058 }
1059
1060 return result;
1061}
1062
1063
1064#if 0
1065static void __exit acpi_ec_exit(void)
1066{
1067
1068 acpi_bus_unregister_driver(&acpi_ec_driver);
1069
1070 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1071
1072 return;
1073}
1074#endif
1075
