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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / acpi / ec.c
blobcaf873c14bfb244a89ba9c322ada05c3c2b3c04e
1 /*
2 * ec.c - ACPI Embedded Controller Driver (v2.0)
3 *
4 * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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 print outs*/
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 <asm/io.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <acpi/actypes.h>
45
46 #define ACPI_EC_CLASS "embedded_controller"
47 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
48 #define ACPI_EC_FILE_INFO "info"
49
50 #undef PREFIX
51 #define PREFIX "ACPI: EC: "
52
53 /* EC status register */
54 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
55 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
56 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
57 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
58
59 /* EC commands */
60 enum ec_command {
61 ACPI_EC_COMMAND_READ = 0x80,
62 ACPI_EC_COMMAND_WRITE = 0x81,
63 ACPI_EC_BURST_ENABLE = 0x82,
64 ACPI_EC_BURST_DISABLE = 0x83,
65 ACPI_EC_COMMAND_QUERY = 0x84,
66 };
67
68 /* EC events */
69 enum ec_event {
70 ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
71 ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
72 };
73
74 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
75 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
76
77 enum {
78 EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */
79 EC_FLAGS_QUERY_PENDING, /* Query is pending */
80 EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */
81 EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */
82 EC_FLAGS_ADDRESS, /* Address is being written */
83 EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */
84 EC_FLAGS_WDATA, /* Data is being written */
85 EC_FLAGS_NO_OBF1_GPE, /* Don't expect GPE before read */
86 };
87
88 static int acpi_ec_remove(struct acpi_device *device, int type);
89 static int acpi_ec_start(struct acpi_device *device);
90 static int acpi_ec_stop(struct acpi_device *device, int type);
91 static int acpi_ec_add(struct acpi_device *device);
92
93 static const struct acpi_device_id ec_device_ids[] = {
94 {"PNP0C09", 0},
95 {"", 0},
96 };
97
98 static struct acpi_driver acpi_ec_driver = {
99 .name = "ec",
100 .class = ACPI_EC_CLASS,
101 .ids = ec_device_ids,
102 .ops = {
103 .add = acpi_ec_add,
104 .remove = acpi_ec_remove,
105 .start = acpi_ec_start,
106 .stop = acpi_ec_stop,
107 },
108 };
109
110 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
111 /* External interfaces use first EC only, so remember */
112 typedef int (*acpi_ec_query_func) (void *data);
113
114 struct acpi_ec_query_handler {
115 struct list_head node;
116 acpi_ec_query_func func;
117 acpi_handle handle;
118 void *data;
119 u8 query_bit;
120 };
121
122 static struct acpi_ec {
123 acpi_handle handle;
124 unsigned long gpe;
125 unsigned long command_addr;
126 unsigned long data_addr;
127 unsigned long global_lock;
128 unsigned long flags;
129 struct mutex lock;
130 wait_queue_head_t wait;
131 struct list_head list;
132 u8 handlers_installed;
133 } *boot_ec, *first_ec;
134
135 /* --------------------------------------------------------------------------
136 Transaction Management
137 -------------------------------------------------------------------------- */
138
139 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
140 {
141 u8 x = inb(ec->command_addr);
142 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
143 return x;
144 }
145
146 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
147 {
148 u8 x = inb(ec->data_addr);
149 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
150 return inb(ec->data_addr);
151 }
152
153 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
154 {
155 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
156 outb(command, ec->command_addr);
157 }
158
159 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
160 {
161 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
162 outb(data, ec->data_addr);
163 }
164
165 static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
166 {
167 if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
168 return 0;
169 if (event == ACPI_EC_EVENT_OBF_1) {
170 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
171 return 1;
172 } else if (event == ACPI_EC_EVENT_IBF_0) {
173 if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
174 return 1;
175 }
176
177 return 0;
178 }
179
180 static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
181 {
182 int ret = 0;
183
184 if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
185 test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
186 force_poll = 1;
187 if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
188 test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
189 force_poll = 1;
190 if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) &&
191 test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags)))
192 force_poll = 1;
193 if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
194 likely(!force_poll)) {
195 if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
196 msecs_to_jiffies(ACPI_EC_DELAY)))
197 goto end;
198 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
199 if (acpi_ec_check_status(ec, event)) {
200 if (event == ACPI_EC_EVENT_OBF_1) {
201 /* miss OBF_1 GPE, don't expect it */
202 pr_info(PREFIX "missing OBF confirmation, "
203 "don't expect it any longer.\n");
204 set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags);
205 } else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
206 /* miss address GPE, don't expect it anymore */
207 pr_info(PREFIX "missing address confirmation, "
208 "don't expect it any longer.\n");
209 set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags);
210 } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) {
211 /* miss write data GPE, don't expect it */
212 pr_info(PREFIX "missing write data confirmation, "
213 "don't expect it any longer.\n");
214 set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags);
215 } else {
216 /* missing GPEs, switch back to poll mode */
217 if (printk_ratelimit())
218 pr_info(PREFIX "missing confirmations, "
219 "switch off interrupt mode.\n");
220 clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
221 }
222 goto end;
223 }
224 } else {
225 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
226 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
227 while (time_before(jiffies, delay)) {
228 if (acpi_ec_check_status(ec, event))
229 goto end;
230 }
231 }
232 pr_err(PREFIX "acpi_ec_wait timeout,"
233 " status = %d, expect_event = %d\n",
234 acpi_ec_read_status(ec), event);
235 ret = -ETIME;
236 end:
237 clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
238 return ret;
239 }
240
241 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
242 const u8 * wdata, unsigned wdata_len,
243 u8 * rdata, unsigned rdata_len,
244 int force_poll)
245 {
246 int result = 0;
247 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
248 acpi_ec_write_cmd(ec, command);
249 pr_debug(PREFIX "transaction start\n");
250 for (; wdata_len > 0; --wdata_len) {
251 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
252 if (result) {
253 pr_err(PREFIX
254 "write_cmd timeout, command = %d\n", command);
255 goto end;
256 }
257 /* mark the address byte written to EC */
258 if (rdata_len + wdata_len > 1)
259 set_bit(EC_FLAGS_ADDRESS, &ec->flags);
260 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
261 acpi_ec_write_data(ec, *(wdata++));
262 }
263
264 if (!rdata_len) {
265 set_bit(EC_FLAGS_WDATA, &ec->flags);
266 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
267 if (result) {
268 pr_err(PREFIX
269 "finish-write timeout, command = %d\n", command);
270 goto end;
271 }
272 } else if (command == ACPI_EC_COMMAND_QUERY)
273 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
274
275 for (; rdata_len > 0; --rdata_len) {
276 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
277 if (result) {
278 pr_err(PREFIX "read timeout, command = %d\n", command);
279 goto end;
280 }
281 /* Don't expect GPE after last read */
282 if (rdata_len > 1)
283 set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
284 *(rdata++) = acpi_ec_read_data(ec);
285 }
286 end:
287 pr_debug(PREFIX "transaction end\n");
288 return result;
289 }
290
291 static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
292 const u8 * wdata, unsigned wdata_len,
293 u8 * rdata, unsigned rdata_len,
294 int force_poll)
295 {
296 int status;
297 u32 glk;
298
299 if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
300 return -EINVAL;
301
302 if (rdata)
303 memset(rdata, 0, rdata_len);
304
305 mutex_lock(&ec->lock);
306 if (ec->global_lock) {
307 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
308 if (ACPI_FAILURE(status)) {
309 mutex_unlock(&ec->lock);
310 return -ENODEV;
311 }
312 }
313
314 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
315 if (status) {
316 pr_err(PREFIX "input buffer is not empty, "
317 "aborting transaction\n");
318 goto end;
319 }
320
321 status = acpi_ec_transaction_unlocked(ec, command,
322 wdata, wdata_len,
323 rdata, rdata_len,
324 force_poll);
325
326 end:
327
328 if (ec->global_lock)
329 acpi_release_global_lock(glk);
330 mutex_unlock(&ec->lock);
331
332 return status;
333 }
334
335 /*
336 * Note: samsung nv5000 doesn't work with ec burst mode.
337 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
338 */
339 int acpi_ec_burst_enable(struct acpi_ec *ec)
340 {
341 u8 d;
342 return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
343 }
344
345 int acpi_ec_burst_disable(struct acpi_ec *ec)
346 {
347 return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
348 }
349
350 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
351 {
352 int result;
353 u8 d;
354
355 result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
356 &address, 1, &d, 1, 0);
357 *data = d;
358 return result;
359 }
360
361 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
362 {
363 u8 wdata[2] = { address, data };
364 return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
365 wdata, 2, NULL, 0, 0);
366 }
367
368 /*
369 * Externally callable EC access functions. For now, assume 1 EC only
370 */
371 int ec_burst_enable(void)
372 {
373 if (!first_ec)
374 return -ENODEV;
375 return acpi_ec_burst_enable(first_ec);
376 }
377
378 EXPORT_SYMBOL(ec_burst_enable);
379
380 int ec_burst_disable(void)
381 {
382 if (!first_ec)
383 return -ENODEV;
384 return acpi_ec_burst_disable(first_ec);
385 }
386
387 EXPORT_SYMBOL(ec_burst_disable);
388
389 int ec_read(u8 addr, u8 * val)
390 {
391 int err;
392 u8 temp_data;
393
394 if (!first_ec)
395 return -ENODEV;
396
397 err = acpi_ec_read(first_ec, addr, &temp_data);
398
399 if (!err) {
400 *val = temp_data;
401 return 0;
402 } else
403 return err;
404 }
405
406 EXPORT_SYMBOL(ec_read);
407
408 int ec_write(u8 addr, u8 val)
409 {
410 int err;
411
412 if (!first_ec)
413 return -ENODEV;
414
415 err = acpi_ec_write(first_ec, addr, val);
416
417 return err;
418 }
419
420 EXPORT_SYMBOL(ec_write);
421
422 int ec_transaction(u8 command,
423 const u8 * wdata, unsigned wdata_len,
424 u8 * rdata, unsigned rdata_len,
425 int force_poll)
426 {
427 if (!first_ec)
428 return -ENODEV;
429
430 return acpi_ec_transaction(first_ec, command, wdata,
431 wdata_len, rdata, rdata_len,
432 force_poll);
433 }
434
435 EXPORT_SYMBOL(ec_transaction);
436
437 static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
438 {
439 int result;
440 u8 d;
441
442 if (!ec || !data)
443 return -EINVAL;
444
445 /*
446 * Query the EC to find out which _Qxx method we need to evaluate.
447 * Note that successful completion of the query causes the ACPI_EC_SCI
448 * bit to be cleared (and thus clearing the interrupt source).
449 */
450
451 result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
452 if (result)
453 return result;
454
455 if (!d)
456 return -ENODATA;
457
458 *data = d;
459 return 0;
460 }
461
462 /* --------------------------------------------------------------------------
463 Event Management
464 -------------------------------------------------------------------------- */
465 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
466 acpi_handle handle, acpi_ec_query_func func,
467 void *data)
468 {
469 struct acpi_ec_query_handler *handler =
470 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
471 if (!handler)
472 return -ENOMEM;
473
474 handler->query_bit = query_bit;
475 handler->handle = handle;
476 handler->func = func;
477 handler->data = data;
478 mutex_lock(&ec->lock);
479 list_add(&handler->node, &ec->list);
480 mutex_unlock(&ec->lock);
481 return 0;
482 }
483
484 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
485
486 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
487 {
488 struct acpi_ec_query_handler *handler, *tmp;
489 mutex_lock(&ec->lock);
490 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
491 if (query_bit == handler->query_bit) {
492 list_del(&handler->node);
493 kfree(handler);
494 }
495 }
496 mutex_unlock(&ec->lock);
497 }
498
499 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
500
501 static void acpi_ec_gpe_query(void *ec_cxt)
502 {
503 struct acpi_ec *ec = ec_cxt;
504 u8 value = 0;
505 struct acpi_ec_query_handler *handler, copy;
506
507 if (!ec || acpi_ec_query(ec, &value))
508 return;
509 mutex_lock(&ec->lock);
510 list_for_each_entry(handler, &ec->list, node) {
511 if (value == handler->query_bit) {
512 /* have custom handler for this bit */
513 memcpy(&copy, handler, sizeof(copy));
514 mutex_unlock(&ec->lock);
515 if (copy.func) {
516 copy.func(copy.data);
517 } else if (copy.handle) {
518 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
519 }
520 return;
521 }
522 }
523 mutex_unlock(&ec->lock);
524 }
525
526 static u32 acpi_ec_gpe_handler(void *data)
527 {
528 acpi_status status = AE_OK;
529 struct acpi_ec *ec = data;
530
531 pr_debug(PREFIX "~~~> interrupt\n");
532 clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
533 if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
534 wake_up(&ec->wait);
535
536 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) {
537 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
538 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
539 acpi_ec_gpe_query, ec);
540 } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) {
541 /* this is non-query, must be confirmation */
542 if (printk_ratelimit())
543 pr_info(PREFIX "non-query interrupt received,"
544 " switching to interrupt mode\n");
545 set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
546 }
547
548 return ACPI_SUCCESS(status) ?
549 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
550 }
551
552 /* --------------------------------------------------------------------------
553 Address Space Management
554 -------------------------------------------------------------------------- */
555
556 static acpi_status
557 acpi_ec_space_setup(acpi_handle region_handle,
558 u32 function, void *handler_context, void **return_context)
559 {
560 /*
561 * The EC object is in the handler context and is needed
562 * when calling the acpi_ec_space_handler.
563 */
564 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
565 handler_context : NULL;
566
567 return AE_OK;
568 }
569
570 static acpi_status
571 acpi_ec_space_handler(u32 function, acpi_physical_address address,
572 u32 bits, acpi_integer *value,
573 void *handler_context, void *region_context)
574 {
575 struct acpi_ec *ec = handler_context;
576 int result = 0, i;
577 u8 temp = 0;
578
579 if ((address > 0xFF) || !value || !handler_context)
580 return AE_BAD_PARAMETER;
581
582 if (function != ACPI_READ && function != ACPI_WRITE)
583 return AE_BAD_PARAMETER;
584
585 if (bits != 8 && acpi_strict)
586 return AE_BAD_PARAMETER;
587
588 acpi_ec_burst_enable(ec);
589
590 if (function == ACPI_READ) {
591 result = acpi_ec_read(ec, address, &temp);
592 *value = temp;
593 } else {
594 temp = 0xff & (*value);
595 result = acpi_ec_write(ec, address, temp);
596 }
597
598 for (i = 8; unlikely(bits - i > 0); i += 8) {
599 ++address;
600 if (function == ACPI_READ) {
601 result = acpi_ec_read(ec, address, &temp);
602 (*value) |= ((acpi_integer)temp) << i;
603 } else {
604 temp = 0xff & ((*value) >> i);
605 result = acpi_ec_write(ec, address, temp);
606 }
607 }
608
609 acpi_ec_burst_disable(ec);
610
611 switch (result) {
612 case -EINVAL:
613 return AE_BAD_PARAMETER;
614 break;
615 case -ENODEV:
616 return AE_NOT_FOUND;
617 break;
618 case -ETIME:
619 return AE_TIME;
620 break;
621 default:
622 return AE_OK;
623 }
624 }
625
626 /* --------------------------------------------------------------------------
627 FS Interface (/proc)
628 -------------------------------------------------------------------------- */
629
630 static struct proc_dir_entry *acpi_ec_dir;
631
632 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
633 {
634 struct acpi_ec *ec = seq->private;
635
636 if (!ec)
637 goto end;
638
639 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
640 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
641 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
642 seq_printf(seq, "use global lock:\t%s\n",
643 ec->global_lock ? "yes" : "no");
644 end:
645 return 0;
646 }
647
648 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
649 {
650 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
651 }
652
653 static struct file_operations acpi_ec_info_ops = {
654 .open = acpi_ec_info_open_fs,
655 .read = seq_read,
656 .llseek = seq_lseek,
657 .release = single_release,
658 .owner = THIS_MODULE,
659 };
660
661 static int acpi_ec_add_fs(struct acpi_device *device)
662 {
663 struct proc_dir_entry *entry = NULL;
664
665 if (!acpi_device_dir(device)) {
666 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
667 acpi_ec_dir);
668 if (!acpi_device_dir(device))
669 return -ENODEV;
670 }
671
672 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
673 acpi_device_dir(device));
674 if (!entry)
675 return -ENODEV;
676 else {
677 entry->proc_fops = &acpi_ec_info_ops;
678 entry->data = acpi_driver_data(device);
679 entry->owner = THIS_MODULE;
680 }
681
682 return 0;
683 }
684
685 static int acpi_ec_remove_fs(struct acpi_device *device)
686 {
687
688 if (acpi_device_dir(device)) {
689 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
690 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
691 acpi_device_dir(device) = NULL;
692 }
693
694 return 0;
695 }
696
697 /* --------------------------------------------------------------------------
698 Driver Interface
699 -------------------------------------------------------------------------- */
700 static acpi_status
701 ec_parse_io_ports(struct acpi_resource *resource, void *context);
702
703 static struct acpi_ec *make_acpi_ec(void)
704 {
705 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
706 if (!ec)
707 return NULL;
708 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
709 mutex_init(&ec->lock);
710 init_waitqueue_head(&ec->wait);
711 INIT_LIST_HEAD(&ec->list);
712 return ec;
713 }
714
715 static acpi_status
716 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
717 void *context, void **return_value)
718 {
719 struct acpi_namespace_node *node = handle;
720 struct acpi_ec *ec = context;
721 int value = 0;
722 if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
723 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
724 }
725 return AE_OK;
726 }
727
728 static acpi_status
729 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
730 {
731 acpi_status status;
732
733 struct acpi_ec *ec = context;
734 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
735 ec_parse_io_ports, ec);
736 if (ACPI_FAILURE(status))
737 return status;
738
739 /* Get GPE bit assignment (EC events). */
740 /* TODO: Add support for _GPE returning a package */
741 status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
742 if (ACPI_FAILURE(status))
743 return status;
744 /* Find and register all query methods */
745 acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
746 acpi_ec_register_query_methods, ec, NULL);
747 /* Use the global lock for all EC transactions? */
748 acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
749 ec->handle = handle;
750 return AE_CTRL_TERMINATE;
751 }
752
753 static void ec_remove_handlers(struct acpi_ec *ec)
754 {
755 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
756 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
757 pr_err(PREFIX "failed to remove space handler\n");
758 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
759 &acpi_ec_gpe_handler)))
760 pr_err(PREFIX "failed to remove gpe handler\n");
761 ec->handlers_installed = 0;
762 }
763
764 static int acpi_ec_add(struct acpi_device *device)
765 {
766 struct acpi_ec *ec = NULL;
767
768 if (!device)
769 return -EINVAL;
770 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
771 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
772
773 /* Check for boot EC */
774 if (boot_ec) {
775 if (boot_ec->handle == device->handle) {
776 /* Pre-loaded EC from DSDT, just move pointer */
777 ec = boot_ec;
778 boot_ec = NULL;
779 goto end;
780 } else if (boot_ec->handle == ACPI_ROOT_OBJECT) {
781 /* ECDT-based EC, time to shut it down */
782 ec_remove_handlers(boot_ec);
783 kfree(boot_ec);
784 first_ec = boot_ec = NULL;
785 }
786 }
787
788 ec = make_acpi_ec();
789 if (!ec)
790 return -ENOMEM;
791
792 if (ec_parse_device(device->handle, 0, ec, NULL) !=
793 AE_CTRL_TERMINATE) {
794 kfree(ec);
795 return -EINVAL;
796 }
797 ec->handle = device->handle;
798 end:
799 if (!first_ec)
800 first_ec = ec;
801 acpi_driver_data(device) = ec;
802 acpi_ec_add_fs(device);
803 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
804 ec->gpe, ec->command_addr, ec->data_addr);
805 pr_info(PREFIX "driver started in %s mode\n",
806 (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
807 return 0;
808 }
809
810 static int acpi_ec_remove(struct acpi_device *device, int type)
811 {
812 struct acpi_ec *ec;
813 struct acpi_ec_query_handler *handler, *tmp;
814
815 if (!device)
816 return -EINVAL;
817
818 ec = acpi_driver_data(device);
819 mutex_lock(&ec->lock);
820 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
821 list_del(&handler->node);
822 kfree(handler);
823 }
824 mutex_unlock(&ec->lock);
825 acpi_ec_remove_fs(device);
826 acpi_driver_data(device) = NULL;
827 if (ec == first_ec)
828 first_ec = NULL;
829 kfree(ec);
830 return 0;
831 }
832
833 static acpi_status
834 ec_parse_io_ports(struct acpi_resource *resource, void *context)
835 {
836 struct acpi_ec *ec = context;
837
838 if (resource->type != ACPI_RESOURCE_TYPE_IO)
839 return AE_OK;
840
841 /*
842 * The first address region returned is the data port, and
843 * the second address region returned is the status/command
844 * port.
845 */
846 if (ec->data_addr == 0)
847 ec->data_addr = resource->data.io.minimum;
848 else if (ec->command_addr == 0)
849 ec->command_addr = resource->data.io.minimum;
850 else
851 return AE_CTRL_TERMINATE;
852
853 return AE_OK;
854 }
855
856 static int ec_install_handlers(struct acpi_ec *ec)
857 {
858 acpi_status status;
859 if (ec->handlers_installed)
860 return 0;
861 status = acpi_install_gpe_handler(NULL, ec->gpe,
862 ACPI_GPE_EDGE_TRIGGERED,
863 &acpi_ec_gpe_handler, ec);
864 if (ACPI_FAILURE(status))
865 return -ENODEV;
866
867 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
868 acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
869
870 status = acpi_install_address_space_handler(ec->handle,
871 ACPI_ADR_SPACE_EC,
872 &acpi_ec_space_handler,
873 &acpi_ec_space_setup, ec);
874 if (ACPI_FAILURE(status)) {
875 acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
876 return -ENODEV;
877 }
878
879 ec->handlers_installed = 1;
880 return 0;
881 }
882
883 static int acpi_ec_start(struct acpi_device *device)
884 {
885 struct acpi_ec *ec;
886 int ret = 0;
887
888 if (!device)
889 return -EINVAL;
890
891 ec = acpi_driver_data(device);
892
893 if (!ec)
894 return -EINVAL;
895
896 ret = ec_install_handlers(ec);
897
898 /* EC is fully operational, allow queries */
899 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
900 return ret;
901 }
902
903 static int acpi_ec_stop(struct acpi_device *device, int type)
904 {
905 struct acpi_ec *ec;
906 if (!device)
907 return -EINVAL;
908 ec = acpi_driver_data(device);
909 if (!ec)
910 return -EINVAL;
911 ec_remove_handlers(ec);
912
913 return 0;
914 }
915
916 int __init acpi_boot_ec_enable(void)
917 {
918 if (!boot_ec || boot_ec->handlers_installed)
919 return 0;
920 if (!ec_install_handlers(boot_ec)) {
921 first_ec = boot_ec;
922 return 0;
923 }
924 return -EFAULT;
925 }
926
927 int __init acpi_ec_ecdt_probe(void)
928 {
929 int ret;
930 acpi_status status;
931 struct acpi_table_ecdt *ecdt_ptr;
932
933 boot_ec = make_acpi_ec();
934 if (!boot_ec)
935 return -ENOMEM;
936 /*
937 * Generate a boot ec context
938 */
939 status = acpi_get_table(ACPI_SIG_ECDT, 1,
940 (struct acpi_table_header **)&ecdt_ptr);
941 if (ACPI_SUCCESS(status)) {
942 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
943 boot_ec->command_addr = ecdt_ptr->control.address;
944 boot_ec->data_addr = ecdt_ptr->data.address;
945 boot_ec->gpe = ecdt_ptr->gpe;
946 if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
947 &boot_ec->handle))) {
948 pr_info("Failed to locate handle for boot EC\n");
949 boot_ec->handle = ACPI_ROOT_OBJECT;
950 }
951 } else {
952 /* This workaround is needed only on some broken machines,
953 * which require early EC, but fail to provide ECDT */
954 acpi_handle x;
955 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
956 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
957 boot_ec, NULL);
958 /* Check that acpi_get_devices actually find something */
959 if (ACPI_FAILURE(status) || !boot_ec->handle)
960 goto error;
961 /* We really need to limit this workaround, the only ASUS,
962 * which needs it, has fake EC._INI method, so use it as flag.
963 * Keep boot_ec struct as it will be needed soon.
964 */
965 if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
966 return -ENODEV;
967 }
968
969 ret = ec_install_handlers(boot_ec);
970 if (!ret) {
971 first_ec = boot_ec;
972 return 0;
973 }
974 error:
975 kfree(boot_ec);
976 boot_ec = NULL;
977 return -ENODEV;
978 }
979
980 static int __init acpi_ec_init(void)
981 {
982 int result = 0;
983
984 if (acpi_disabled)
985 return 0;
986
987 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
988 if (!acpi_ec_dir)
989 return -ENODEV;
990
991 /* Now register the driver for the EC */
992 result = acpi_bus_register_driver(&acpi_ec_driver);
993 if (result < 0) {
994 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
995 return -ENODEV;
996 }
997
998 return result;
999 }
1000
1001 subsys_initcall(acpi_ec_init);
1002
1003 /* EC driver currently not unloadable */
1004 #if 0
1005 static void __exit acpi_ec_exit(void)
1006 {
1007
1008 acpi_bus_unregister_driver(&acpi_ec_driver);
1009
1010 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1011
1012 return;
1013 }
1014 #endif /* 0 */
WRT350N Kernel Patches