ia64/linux-2.6.18-xen.hg

view drivers/acpi/ec.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/delay.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/interrupt.h>
35 #include <asm/io.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
38 #include <acpi/actypes.h>
40 #define _COMPONENT ACPI_EC_COMPONENT
41 ACPI_MODULE_NAME("acpi_ec")
42 #define ACPI_EC_COMPONENT 0x00100000
43 #define ACPI_EC_CLASS "embedded_controller"
44 #define ACPI_EC_HID "PNP0C09"
45 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
46 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
47 #define ACPI_EC_FILE_INFO "info"
48 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
49 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
50 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
51 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
52 #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
53 #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
54 #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
55 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
56 #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
57 #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */
58 #define ACPI_EC_COMMAND_READ 0x80
59 #define ACPI_EC_COMMAND_WRITE 0x81
60 #define ACPI_EC_BURST_ENABLE 0x82
61 #define ACPI_EC_BURST_DISABLE 0x83
62 #define ACPI_EC_COMMAND_QUERY 0x84
63 #define EC_POLL 0xFF
64 #define EC_INTR 0x00
65 static int acpi_ec_remove(struct acpi_device *device, int type);
66 static int acpi_ec_start(struct acpi_device *device);
67 static int acpi_ec_stop(struct acpi_device *device, int type);
68 static int acpi_ec_intr_add(struct acpi_device *device);
69 static int acpi_ec_poll_add(struct acpi_device *device);
71 static struct acpi_driver acpi_ec_driver = {
72 .name = ACPI_EC_DRIVER_NAME,
73 .class = ACPI_EC_CLASS,
74 .ids = ACPI_EC_HID,
75 .ops = {
76 .add = acpi_ec_intr_add,
77 .remove = acpi_ec_remove,
78 .start = acpi_ec_start,
79 .stop = acpi_ec_stop,
80 },
81 };
82 union acpi_ec {
83 struct {
84 u32 mode;
85 acpi_handle handle;
86 unsigned long uid;
87 unsigned long gpe_bit;
88 struct acpi_generic_address status_addr;
89 struct acpi_generic_address command_addr;
90 struct acpi_generic_address data_addr;
91 unsigned long global_lock;
92 } common;
94 struct {
95 u32 mode;
96 acpi_handle handle;
97 unsigned long uid;
98 unsigned long gpe_bit;
99 struct acpi_generic_address status_addr;
100 struct acpi_generic_address command_addr;
101 struct acpi_generic_address data_addr;
102 unsigned long global_lock;
103 unsigned int expect_event;
104 atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
105 atomic_t pending_gpe;
106 struct semaphore sem;
107 wait_queue_head_t wait;
108 } intr;
110 struct {
111 u32 mode;
112 acpi_handle handle;
113 unsigned long uid;
114 unsigned long gpe_bit;
115 struct acpi_generic_address status_addr;
116 struct acpi_generic_address command_addr;
117 struct acpi_generic_address data_addr;
118 unsigned long global_lock;
119 struct semaphore sem;
120 } poll;
121 };
123 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
124 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
125 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data);
126 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data);
127 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data);
128 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data);
129 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data);
130 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data);
131 static void acpi_ec_gpe_poll_query(void *ec_cxt);
132 static void acpi_ec_gpe_intr_query(void *ec_cxt);
133 static u32 acpi_ec_gpe_poll_handler(void *data);
134 static u32 acpi_ec_gpe_intr_handler(void *data);
135 static acpi_status __init
136 acpi_fake_ecdt_poll_callback(acpi_handle handle,
137 u32 Level, void *context, void **retval);
139 static acpi_status __init
140 acpi_fake_ecdt_intr_callback(acpi_handle handle,
141 u32 Level, void *context, void **retval);
143 static int __init acpi_ec_poll_get_real_ecdt(void);
144 static int __init acpi_ec_intr_get_real_ecdt(void);
145 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
146 static union acpi_ec *ec_ecdt;
148 /* External interfaces use first EC only, so remember */
149 static struct acpi_device *first_ec;
150 static int acpi_ec_poll_mode = EC_INTR;
152 /* --------------------------------------------------------------------------
153 Transaction Management
154 -------------------------------------------------------------------------- */
156 static u32 acpi_ec_read_status(union acpi_ec *ec)
157 {
158 u32 status = 0;
160 acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
161 return status;
162 }
164 static int acpi_ec_wait(union acpi_ec *ec, u8 event)
165 {
166 if (acpi_ec_poll_mode)
167 return acpi_ec_poll_wait(ec, event);
168 else
169 return acpi_ec_intr_wait(ec, event);
170 }
172 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
173 {
174 u32 acpi_ec_status = 0;
175 u32 i = ACPI_EC_UDELAY_COUNT;
177 if (!ec)
178 return -EINVAL;
180 /* Poll the EC status register waiting for the event to occur. */
181 switch (event) {
182 case ACPI_EC_EVENT_OBF:
183 do {
184 acpi_hw_low_level_read(8, &acpi_ec_status,
185 &ec->common.status_addr);
186 if (acpi_ec_status & ACPI_EC_FLAG_OBF)
187 return 0;
188 udelay(ACPI_EC_UDELAY);
189 } while (--i > 0);
190 break;
191 case ACPI_EC_EVENT_IBE:
192 do {
193 acpi_hw_low_level_read(8, &acpi_ec_status,
194 &ec->common.status_addr);
195 if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
196 return 0;
197 udelay(ACPI_EC_UDELAY);
198 } while (--i > 0);
199 break;
200 default:
201 return -EINVAL;
202 }
204 return -ETIME;
205 }
206 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
207 {
208 int result = 0;
211 ec->intr.expect_event = event;
212 smp_mb();
214 switch (event) {
215 case ACPI_EC_EVENT_IBE:
216 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) {
217 ec->intr.expect_event = 0;
218 return 0;
219 }
220 break;
221 default:
222 break;
223 }
225 result = wait_event_timeout(ec->intr.wait,
226 !ec->intr.expect_event,
227 msecs_to_jiffies(ACPI_EC_DELAY));
229 ec->intr.expect_event = 0;
230 smp_mb();
232 /*
233 * Verify that the event in question has actually happened by
234 * querying EC status. Do the check even if operation timed-out
235 * to make sure that we did not miss interrupt.
236 */
237 switch (event) {
238 case ACPI_EC_EVENT_OBF:
239 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
240 return 0;
241 break;
243 case ACPI_EC_EVENT_IBE:
244 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
245 return 0;
246 break;
247 }
249 return -ETIME;
250 }
252 #ifdef ACPI_FUTURE_USAGE
253 /*
254 * Note: samsung nv5000 doesn't work with ec burst mode.
255 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
256 */
257 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
258 {
259 u32 tmp = 0;
260 int status = 0;
263 status = acpi_ec_read_status(ec);
264 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
265 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
266 if (status)
267 goto end;
268 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
269 &ec->common.command_addr);
270 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
271 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
272 if (tmp != 0x90) { /* Burst ACK byte */
273 return -EINVAL;
274 }
275 }
277 atomic_set(&ec->intr.leaving_burst, 0);
278 return 0;
279 end:
280 ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode");
281 return -1;
282 }
284 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
285 {
286 int status = 0;
289 status = acpi_ec_read_status(ec);
290 if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
291 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
292 if(status)
293 goto end;
294 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
295 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
296 }
297 atomic_set(&ec->intr.leaving_burst, 1);
298 return 0;
299 end:
300 ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode");
301 return -1;
302 }
303 #endif /* ACPI_FUTURE_USAGE */
305 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
306 {
307 if (acpi_ec_poll_mode)
308 return acpi_ec_poll_read(ec, address, data);
309 else
310 return acpi_ec_intr_read(ec, address, data);
311 }
312 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
313 {
314 if (acpi_ec_poll_mode)
315 return acpi_ec_poll_write(ec, address, data);
316 else
317 return acpi_ec_intr_write(ec, address, data);
318 }
319 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
320 {
321 acpi_status status = AE_OK;
322 int result = 0;
323 u32 glk = 0;
326 if (!ec || !data)
327 return -EINVAL;
329 *data = 0;
331 if (ec->common.global_lock) {
332 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
333 if (ACPI_FAILURE(status))
334 return -ENODEV;
335 }
337 if (down_interruptible(&ec->poll.sem)) {
338 result = -ERESTARTSYS;
339 goto end_nosem;
340 }
342 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
343 &ec->common.command_addr);
344 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
345 if (result)
346 goto end;
348 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
349 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
350 if (result)
351 goto end;
353 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
355 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
356 *data, address));
358 end:
359 up(&ec->poll.sem);
360 end_nosem:
361 if (ec->common.global_lock)
362 acpi_release_global_lock(glk);
364 return result;
365 }
367 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
368 {
369 int result = 0;
370 acpi_status status = AE_OK;
371 u32 glk = 0;
374 if (!ec)
375 return -EINVAL;
377 if (ec->common.global_lock) {
378 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
379 if (ACPI_FAILURE(status))
380 return -ENODEV;
381 }
383 if (down_interruptible(&ec->poll.sem)) {
384 result = -ERESTARTSYS;
385 goto end_nosem;
386 }
388 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
389 &ec->common.command_addr);
390 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
391 if (result)
392 goto end;
394 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
395 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
396 if (result)
397 goto end;
399 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
400 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
401 if (result)
402 goto end;
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
405 data, address));
407 end:
408 up(&ec->poll.sem);
409 end_nosem:
410 if (ec->common.global_lock)
411 acpi_release_global_lock(glk);
413 return result;
414 }
416 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
417 {
418 int status = 0;
419 u32 glk;
422 if (!ec || !data)
423 return -EINVAL;
425 *data = 0;
427 if (ec->common.global_lock) {
428 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
429 if (ACPI_FAILURE(status))
430 return -ENODEV;
431 }
433 WARN_ON(in_interrupt());
434 down(&ec->intr.sem);
436 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
437 if (status) {
438 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
439 goto end;
440 }
441 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
442 &ec->common.command_addr);
443 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
444 if (status) {
445 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
446 }
448 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
449 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
450 if (status) {
451 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
452 goto end;
453 }
454 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
455 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
456 *data, address));
458 end:
459 up(&ec->intr.sem);
461 if (ec->common.global_lock)
462 acpi_release_global_lock(glk);
464 return status;
465 }
467 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
468 {
469 int status = 0;
470 u32 glk;
473 if (!ec)
474 return -EINVAL;
476 if (ec->common.global_lock) {
477 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
478 if (ACPI_FAILURE(status))
479 return -ENODEV;
480 }
482 WARN_ON(in_interrupt());
483 down(&ec->intr.sem);
485 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
486 if (status) {
487 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
488 }
489 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
490 &ec->common.command_addr);
491 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
492 if (status) {
493 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
494 }
496 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
497 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
498 if (status) {
499 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
500 }
502 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
504 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
505 data, address));
507 up(&ec->intr.sem);
509 if (ec->common.global_lock)
510 acpi_release_global_lock(glk);
512 return status;
513 }
515 /*
516 * Externally callable EC access functions. For now, assume 1 EC only
517 */
518 int ec_read(u8 addr, u8 * val)
519 {
520 union acpi_ec *ec;
521 int err;
522 u32 temp_data;
524 if (!first_ec)
525 return -ENODEV;
527 ec = acpi_driver_data(first_ec);
529 err = acpi_ec_read(ec, addr, &temp_data);
531 if (!err) {
532 *val = temp_data;
533 return 0;
534 } else
535 return err;
536 }
538 EXPORT_SYMBOL(ec_read);
540 int ec_write(u8 addr, u8 val)
541 {
542 union acpi_ec *ec;
543 int err;
545 if (!first_ec)
546 return -ENODEV;
548 ec = acpi_driver_data(first_ec);
550 err = acpi_ec_write(ec, addr, val);
552 return err;
553 }
555 EXPORT_SYMBOL(ec_write);
557 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
558 {
559 if (acpi_ec_poll_mode)
560 return acpi_ec_poll_query(ec, data);
561 else
562 return acpi_ec_intr_query(ec, data);
563 }
564 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
565 {
566 int result = 0;
567 acpi_status status = AE_OK;
568 u32 glk = 0;
571 if (!ec || !data)
572 return -EINVAL;
574 *data = 0;
576 if (ec->common.global_lock) {
577 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
578 if (ACPI_FAILURE(status))
579 return -ENODEV;
580 }
582 /*
583 * Query the EC to find out which _Qxx method we need to evaluate.
584 * Note that successful completion of the query causes the ACPI_EC_SCI
585 * bit to be cleared (and thus clearing the interrupt source).
586 */
587 if (down_interruptible(&ec->poll.sem)) {
588 result = -ERESTARTSYS;
589 goto end_nosem;
590 }
592 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
593 &ec->common.command_addr);
594 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
595 if (result)
596 goto end;
598 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
599 if (!*data)
600 result = -ENODATA;
602 end:
603 up(&ec->poll.sem);
604 end_nosem:
605 if (ec->common.global_lock)
606 acpi_release_global_lock(glk);
608 return result;
609 }
610 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
611 {
612 int status = 0;
613 u32 glk;
616 if (!ec || !data)
617 return -EINVAL;
618 *data = 0;
620 if (ec->common.global_lock) {
621 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
622 if (ACPI_FAILURE(status))
623 return -ENODEV;
624 }
626 down(&ec->intr.sem);
628 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
629 if (status) {
630 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
631 goto end;
632 }
633 /*
634 * Query the EC to find out which _Qxx method we need to evaluate.
635 * Note that successful completion of the query causes the ACPI_EC_SCI
636 * bit to be cleared (and thus clearing the interrupt source).
637 */
638 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
639 &ec->common.command_addr);
640 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
641 if (status) {
642 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
643 goto end;
644 }
646 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
647 if (!*data)
648 status = -ENODATA;
650 end:
651 up(&ec->intr.sem);
653 if (ec->common.global_lock)
654 acpi_release_global_lock(glk);
656 return status;
657 }
659 /* --------------------------------------------------------------------------
660 Event Management
661 -------------------------------------------------------------------------- */
663 union acpi_ec_query_data {
664 acpi_handle handle;
665 u8 data;
666 };
668 static void acpi_ec_gpe_query(void *ec_cxt)
669 {
670 if (acpi_ec_poll_mode)
671 acpi_ec_gpe_poll_query(ec_cxt);
672 else
673 acpi_ec_gpe_intr_query(ec_cxt);
674 }
676 static void acpi_ec_gpe_poll_query(void *ec_cxt)
677 {
678 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
679 u32 value = 0;
680 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
681 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
682 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
683 };
686 if (!ec_cxt)
687 goto end;
689 if (down_interruptible (&ec->poll.sem)) {
690 return;
691 }
692 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
693 up(&ec->poll.sem);
695 /* TBD: Implement asynch events!
696 * NOTE: All we care about are EC-SCI's. Other EC events are
697 * handled via polling (yuck!). This is because some systems
698 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
699 * a purely interrupt-driven approach (grumble, grumble).
700 */
701 if (!(value & ACPI_EC_FLAG_SCI))
702 goto end;
704 if (acpi_ec_query(ec, &value))
705 goto end;
707 object_name[2] = hex[((value >> 4) & 0x0F)];
708 object_name[3] = hex[(value & 0x0F)];
710 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
712 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
714 end:
715 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
716 }
717 static void acpi_ec_gpe_intr_query(void *ec_cxt)
718 {
719 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
720 u32 value;
721 int result = -ENODATA;
722 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
723 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
724 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
725 };
728 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
729 result = acpi_ec_query(ec, &value);
731 if (result)
732 goto end;
734 object_name[2] = hex[((value >> 4) & 0x0F)];
735 object_name[3] = hex[(value & 0x0F)];
737 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
739 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
740 end:
741 atomic_dec(&ec->intr.pending_gpe);
742 return;
743 }
745 static u32 acpi_ec_gpe_handler(void *data)
746 {
747 if (acpi_ec_poll_mode)
748 return acpi_ec_gpe_poll_handler(data);
749 else
750 return acpi_ec_gpe_intr_handler(data);
751 }
752 static u32 acpi_ec_gpe_poll_handler(void *data)
753 {
754 acpi_status status = AE_OK;
755 union acpi_ec *ec = (union acpi_ec *)data;
757 if (!ec)
758 return ACPI_INTERRUPT_NOT_HANDLED;
760 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
762 status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
764 if (status == AE_OK)
765 return ACPI_INTERRUPT_HANDLED;
766 else
767 return ACPI_INTERRUPT_NOT_HANDLED;
768 }
769 static u32 acpi_ec_gpe_intr_handler(void *data)
770 {
771 acpi_status status = AE_OK;
772 u32 value;
773 union acpi_ec *ec = (union acpi_ec *)data;
775 if (!ec)
776 return ACPI_INTERRUPT_NOT_HANDLED;
778 acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
779 value = acpi_ec_read_status(ec);
781 switch (ec->intr.expect_event) {
782 case ACPI_EC_EVENT_OBF:
783 if (!(value & ACPI_EC_FLAG_OBF))
784 break;
785 ec->intr.expect_event = 0;
786 wake_up(&ec->intr.wait);
787 break;
788 case ACPI_EC_EVENT_IBE:
789 if ((value & ACPI_EC_FLAG_IBF))
790 break;
791 ec->intr.expect_event = 0;
792 wake_up(&ec->intr.wait);
793 break;
794 default:
795 break;
796 }
798 if (value & ACPI_EC_FLAG_SCI) {
799 atomic_add(1, &ec->intr.pending_gpe);
800 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
801 acpi_ec_gpe_query, ec);
802 return status == AE_OK ?
803 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
804 }
805 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
806 return status == AE_OK ?
807 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
808 }
810 /* --------------------------------------------------------------------------
811 Address Space Management
812 -------------------------------------------------------------------------- */
814 static acpi_status
815 acpi_ec_space_setup(acpi_handle region_handle,
816 u32 function, void *handler_context, void **return_context)
817 {
818 /*
819 * The EC object is in the handler context and is needed
820 * when calling the acpi_ec_space_handler.
821 */
822 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
823 handler_context : NULL;
825 return AE_OK;
826 }
828 static acpi_status
829 acpi_ec_space_handler(u32 function,
830 acpi_physical_address address,
831 u32 bit_width,
832 acpi_integer * value,
833 void *handler_context, void *region_context)
834 {
835 int result = 0;
836 union acpi_ec *ec = NULL;
837 u64 temp = *value;
838 acpi_integer f_v = 0;
839 int i = 0;
842 if ((address > 0xFF) || !value || !handler_context)
843 return AE_BAD_PARAMETER;
845 if (bit_width != 8 && acpi_strict) {
846 printk(KERN_WARNING PREFIX
847 "acpi_ec_space_handler: bit_width should be 8\n");
848 return AE_BAD_PARAMETER;
849 }
851 ec = (union acpi_ec *)handler_context;
853 next_byte:
854 switch (function) {
855 case ACPI_READ:
856 temp = 0;
857 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
858 break;
859 case ACPI_WRITE:
860 result = acpi_ec_write(ec, (u8) address, (u8) temp);
861 break;
862 default:
863 result = -EINVAL;
864 goto out;
865 break;
866 }
868 bit_width -= 8;
869 if (bit_width) {
870 if (function == ACPI_READ)
871 f_v |= temp << 8 * i;
872 if (function == ACPI_WRITE)
873 temp >>= 8;
874 i++;
875 address++;
876 goto next_byte;
877 }
879 if (function == ACPI_READ) {
880 f_v |= temp << 8 * i;
881 *value = f_v;
882 }
884 out:
885 switch (result) {
886 case -EINVAL:
887 return AE_BAD_PARAMETER;
888 break;
889 case -ENODEV:
890 return AE_NOT_FOUND;
891 break;
892 case -ETIME:
893 return AE_TIME;
894 break;
895 default:
896 return AE_OK;
897 }
898 }
900 /* --------------------------------------------------------------------------
901 FS Interface (/proc)
902 -------------------------------------------------------------------------- */
904 static struct proc_dir_entry *acpi_ec_dir;
906 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
907 {
908 union acpi_ec *ec = (union acpi_ec *)seq->private;
911 if (!ec)
912 goto end;
914 seq_printf(seq, "gpe bit: 0x%02x\n",
915 (u32) ec->common.gpe_bit);
916 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
917 (u32) ec->common.status_addr.address,
918 (u32) ec->common.data_addr.address);
919 seq_printf(seq, "use global lock: %s\n",
920 ec->common.global_lock ? "yes" : "no");
921 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
923 end:
924 return 0;
925 }
927 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
928 {
929 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
930 }
932 static const struct file_operations acpi_ec_info_ops = {
933 .open = acpi_ec_info_open_fs,
934 .read = seq_read,
935 .llseek = seq_lseek,
936 .release = single_release,
937 .owner = THIS_MODULE,
938 };
940 static int acpi_ec_add_fs(struct acpi_device *device)
941 {
942 struct proc_dir_entry *entry = NULL;
945 if (!acpi_device_dir(device)) {
946 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
947 acpi_ec_dir);
948 if (!acpi_device_dir(device))
949 return -ENODEV;
950 }
952 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
953 acpi_device_dir(device));
954 if (!entry)
955 return -ENODEV;
956 else {
957 entry->proc_fops = &acpi_ec_info_ops;
958 entry->data = acpi_driver_data(device);
959 entry->owner = THIS_MODULE;
960 }
962 return 0;
963 }
965 static int acpi_ec_remove_fs(struct acpi_device *device)
966 {
968 if (acpi_device_dir(device)) {
969 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
970 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
971 acpi_device_dir(device) = NULL;
972 }
974 return 0;
975 }
977 /* --------------------------------------------------------------------------
978 Driver Interface
979 -------------------------------------------------------------------------- */
981 static int acpi_ec_poll_add(struct acpi_device *device)
982 {
983 int result = 0;
984 acpi_status status = AE_OK;
985 union acpi_ec *ec = NULL;
988 if (!device)
989 return -EINVAL;
991 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
992 if (!ec)
993 return -ENOMEM;
994 memset(ec, 0, sizeof(union acpi_ec));
996 ec->common.handle = device->handle;
997 ec->common.uid = -1;
998 init_MUTEX(&ec->poll.sem);
999 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1000 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1001 acpi_driver_data(device) = ec;
1003 /* Use the global lock for all EC transactions? */
1004 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1005 &ec->common.global_lock);
1007 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1008 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1009 if (ec_ecdt) {
1010 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1011 ACPI_ADR_SPACE_EC,
1012 &acpi_ec_space_handler);
1014 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1015 &acpi_ec_gpe_handler);
1017 kfree(ec_ecdt);
1020 /* Get GPE bit assignment (EC events). */
1021 /* TODO: Add support for _GPE returning a package */
1022 status =
1023 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1024 &ec->common.gpe_bit);
1025 if (ACPI_FAILURE(status)) {
1026 ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit"));
1027 result = -ENODEV;
1028 goto end;
1031 result = acpi_ec_add_fs(device);
1032 if (result)
1033 goto end;
1035 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1036 acpi_device_name(device), acpi_device_bid(device),
1037 (u32) ec->common.gpe_bit);
1039 if (!first_ec)
1040 first_ec = device;
1042 end:
1043 if (result)
1044 kfree(ec);
1046 return result;
1048 static int acpi_ec_intr_add(struct acpi_device *device)
1050 int result = 0;
1051 acpi_status status = AE_OK;
1052 union acpi_ec *ec = NULL;
1055 if (!device)
1056 return -EINVAL;
1058 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1059 if (!ec)
1060 return -ENOMEM;
1061 memset(ec, 0, sizeof(union acpi_ec));
1063 ec->common.handle = device->handle;
1064 ec->common.uid = -1;
1065 atomic_set(&ec->intr.pending_gpe, 0);
1066 atomic_set(&ec->intr.leaving_burst, 1);
1067 init_MUTEX(&ec->intr.sem);
1068 init_waitqueue_head(&ec->intr.wait);
1069 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1070 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1071 acpi_driver_data(device) = ec;
1073 /* Use the global lock for all EC transactions? */
1074 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1075 &ec->common.global_lock);
1077 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1078 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1079 if (ec_ecdt) {
1080 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1081 ACPI_ADR_SPACE_EC,
1082 &acpi_ec_space_handler);
1084 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1085 &acpi_ec_gpe_handler);
1087 kfree(ec_ecdt);
1090 /* Get GPE bit assignment (EC events). */
1091 /* TODO: Add support for _GPE returning a package */
1092 status =
1093 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1094 &ec->common.gpe_bit);
1095 if (ACPI_FAILURE(status)) {
1096 printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n");
1097 result = -ENODEV;
1098 goto end;
1101 result = acpi_ec_add_fs(device);
1102 if (result)
1103 goto end;
1105 printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1106 acpi_device_name(device), acpi_device_bid(device),
1107 (u32) ec->common.gpe_bit);
1109 if (!first_ec)
1110 first_ec = device;
1112 end:
1113 if (result)
1114 kfree(ec);
1116 return result;
1119 static int acpi_ec_remove(struct acpi_device *device, int type)
1121 union acpi_ec *ec = NULL;
1124 if (!device)
1125 return -EINVAL;
1127 ec = acpi_driver_data(device);
1129 acpi_ec_remove_fs(device);
1131 kfree(ec);
1133 return 0;
1136 static acpi_status
1137 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1139 union acpi_ec *ec = (union acpi_ec *)context;
1140 struct acpi_generic_address *addr;
1142 if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1143 return AE_OK;
1146 /*
1147 * The first address region returned is the data port, and
1148 * the second address region returned is the status/command
1149 * port.
1150 */
1151 if (ec->common.data_addr.register_bit_width == 0) {
1152 addr = &ec->common.data_addr;
1153 } else if (ec->common.command_addr.register_bit_width == 0) {
1154 addr = &ec->common.command_addr;
1155 } else {
1156 return AE_CTRL_TERMINATE;
1159 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1160 addr->register_bit_width = 8;
1161 addr->register_bit_offset = 0;
1162 addr->address = resource->data.io.minimum;
1164 return AE_OK;
1167 static int acpi_ec_start(struct acpi_device *device)
1169 acpi_status status = AE_OK;
1170 union acpi_ec *ec = NULL;
1173 if (!device)
1174 return -EINVAL;
1176 ec = acpi_driver_data(device);
1178 if (!ec)
1179 return -EINVAL;
1181 /*
1182 * Get I/O port addresses. Convert to GAS format.
1183 */
1184 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1185 acpi_ec_io_ports, ec);
1186 if (ACPI_FAILURE(status)
1187 || ec->common.command_addr.register_bit_width == 0) {
1188 printk(KERN_ERR PREFIX "Error getting I/O port addresses\n");
1189 return -ENODEV;
1192 ec->common.status_addr = ec->common.command_addr;
1194 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1195 (u32) ec->common.gpe_bit,
1196 (u32) ec->common.command_addr.address,
1197 (u32) ec->common.data_addr.address));
1199 /*
1200 * Install GPE handler
1201 */
1202 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1203 ACPI_GPE_EDGE_TRIGGERED,
1204 &acpi_ec_gpe_handler, ec);
1205 if (ACPI_FAILURE(status)) {
1206 return -ENODEV;
1208 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1209 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1211 status = acpi_install_address_space_handler(ec->common.handle,
1212 ACPI_ADR_SPACE_EC,
1213 &acpi_ec_space_handler,
1214 &acpi_ec_space_setup, ec);
1215 if (ACPI_FAILURE(status)) {
1216 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1217 &acpi_ec_gpe_handler);
1218 return -ENODEV;
1221 return AE_OK;
1224 static int acpi_ec_stop(struct acpi_device *device, int type)
1226 acpi_status status = AE_OK;
1227 union acpi_ec *ec = NULL;
1230 if (!device)
1231 return -EINVAL;
1233 ec = acpi_driver_data(device);
1235 status = acpi_remove_address_space_handler(ec->common.handle,
1236 ACPI_ADR_SPACE_EC,
1237 &acpi_ec_space_handler);
1238 if (ACPI_FAILURE(status))
1239 return -ENODEV;
1241 status =
1242 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1243 &acpi_ec_gpe_handler);
1244 if (ACPI_FAILURE(status))
1245 return -ENODEV;
1247 return 0;
1250 static acpi_status __init
1251 acpi_fake_ecdt_callback(acpi_handle handle,
1252 u32 Level, void *context, void **retval)
1255 if (acpi_ec_poll_mode)
1256 return acpi_fake_ecdt_poll_callback(handle,
1257 Level, context, retval);
1258 else
1259 return acpi_fake_ecdt_intr_callback(handle,
1260 Level, context, retval);
1263 static acpi_status __init
1264 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1265 u32 Level, void *context, void **retval)
1267 acpi_status status;
1269 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1270 acpi_ec_io_ports, ec_ecdt);
1271 if (ACPI_FAILURE(status))
1272 return status;
1273 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1275 ec_ecdt->common.uid = -1;
1276 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1278 status =
1279 acpi_evaluate_integer(handle, "_GPE", NULL,
1280 &ec_ecdt->common.gpe_bit);
1281 if (ACPI_FAILURE(status))
1282 return status;
1283 init_MUTEX(&ec_ecdt->poll.sem);
1284 ec_ecdt->common.global_lock = TRUE;
1285 ec_ecdt->common.handle = handle;
1287 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1288 (u32) ec_ecdt->common.gpe_bit,
1289 (u32) ec_ecdt->common.command_addr.address,
1290 (u32) ec_ecdt->common.data_addr.address);
1292 return AE_CTRL_TERMINATE;
1295 static acpi_status __init
1296 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1297 u32 Level, void *context, void **retval)
1299 acpi_status status;
1301 init_MUTEX(&ec_ecdt->intr.sem);
1302 init_waitqueue_head(&ec_ecdt->intr.wait);
1303 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1304 acpi_ec_io_ports, ec_ecdt);
1305 if (ACPI_FAILURE(status))
1306 return status;
1307 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1309 ec_ecdt->common.uid = -1;
1310 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1312 status =
1313 acpi_evaluate_integer(handle, "_GPE", NULL,
1314 &ec_ecdt->common.gpe_bit);
1315 if (ACPI_FAILURE(status))
1316 return status;
1317 ec_ecdt->common.global_lock = TRUE;
1318 ec_ecdt->common.handle = handle;
1320 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1321 (u32) ec_ecdt->common.gpe_bit,
1322 (u32) ec_ecdt->common.command_addr.address,
1323 (u32) ec_ecdt->common.data_addr.address);
1325 return AE_CTRL_TERMINATE;
1328 /*
1329 * Some BIOS (such as some from Gateway laptops) access EC region very early
1330 * such as in BAT0._INI or EC._INI before an EC device is found and
1331 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1332 * required, but if EC regison is accessed early, it is required.
1333 * The routine tries to workaround the BIOS bug by pre-scan EC device
1334 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1335 * op region (since _REG isn't invoked yet). The assumption is true for
1336 * all systems found.
1337 */
1338 static int __init acpi_ec_fake_ecdt(void)
1340 acpi_status status;
1341 int ret = 0;
1343 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1345 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1346 if (!ec_ecdt) {
1347 ret = -ENOMEM;
1348 goto error;
1350 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1352 status = acpi_get_devices(ACPI_EC_HID,
1353 acpi_fake_ecdt_callback, NULL, NULL);
1354 if (ACPI_FAILURE(status)) {
1355 kfree(ec_ecdt);
1356 ec_ecdt = NULL;
1357 ret = -ENODEV;
1358 goto error;
1360 return 0;
1361 error:
1362 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1363 return ret;
1366 static int __init acpi_ec_get_real_ecdt(void)
1368 if (acpi_ec_poll_mode)
1369 return acpi_ec_poll_get_real_ecdt();
1370 else
1371 return acpi_ec_intr_get_real_ecdt();
1374 static int __init acpi_ec_poll_get_real_ecdt(void)
1376 acpi_status status;
1377 struct acpi_table_ecdt *ecdt_ptr;
1379 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1380 (struct acpi_table_header **)
1381 &ecdt_ptr);
1382 if (ACPI_FAILURE(status))
1383 return -ENODEV;
1385 printk(KERN_INFO PREFIX "Found ECDT\n");
1387 /*
1388 * Generate a temporary ec context to use until the namespace is scanned
1389 */
1390 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1391 if (!ec_ecdt)
1392 return -ENOMEM;
1393 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1395 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1396 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1397 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1398 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1399 init_MUTEX(&ec_ecdt->poll.sem);
1400 /* use the GL just to be safe */
1401 ec_ecdt->common.global_lock = TRUE;
1402 ec_ecdt->common.uid = ecdt_ptr->uid;
1404 status =
1405 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1406 if (ACPI_FAILURE(status)) {
1407 goto error;
1410 return 0;
1411 error:
1412 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1413 kfree(ec_ecdt);
1414 ec_ecdt = NULL;
1416 return -ENODEV;
1419 static int __init acpi_ec_intr_get_real_ecdt(void)
1421 acpi_status status;
1422 struct acpi_table_ecdt *ecdt_ptr;
1424 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1425 (struct acpi_table_header **)
1426 &ecdt_ptr);
1427 if (ACPI_FAILURE(status))
1428 return -ENODEV;
1430 printk(KERN_INFO PREFIX "Found ECDT\n");
1432 /*
1433 * Generate a temporary ec context to use until the namespace is scanned
1434 */
1435 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1436 if (!ec_ecdt)
1437 return -ENOMEM;
1438 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1440 init_MUTEX(&ec_ecdt->intr.sem);
1441 init_waitqueue_head(&ec_ecdt->intr.wait);
1442 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1443 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1444 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1445 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1446 /* use the GL just to be safe */
1447 ec_ecdt->common.global_lock = TRUE;
1448 ec_ecdt->common.uid = ecdt_ptr->uid;
1450 status =
1451 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1452 if (ACPI_FAILURE(status)) {
1453 goto error;
1456 return 0;
1457 error:
1458 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1459 kfree(ec_ecdt);
1460 ec_ecdt = NULL;
1462 return -ENODEV;
1465 static int __initdata acpi_fake_ecdt_enabled;
1466 int __init acpi_ec_ecdt_probe(void)
1468 acpi_status status;
1469 int ret;
1471 ret = acpi_ec_get_real_ecdt();
1472 /* Try to make a fake ECDT */
1473 if (ret && acpi_fake_ecdt_enabled) {
1474 ret = acpi_ec_fake_ecdt();
1477 if (ret)
1478 return 0;
1480 /*
1481 * Install GPE handler
1482 */
1483 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1484 ACPI_GPE_EDGE_TRIGGERED,
1485 &acpi_ec_gpe_handler, ec_ecdt);
1486 if (ACPI_FAILURE(status)) {
1487 goto error;
1489 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1490 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1492 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1493 ACPI_ADR_SPACE_EC,
1494 &acpi_ec_space_handler,
1495 &acpi_ec_space_setup,
1496 ec_ecdt);
1497 if (ACPI_FAILURE(status)) {
1498 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1499 &acpi_ec_gpe_handler);
1500 goto error;
1503 return 0;
1505 error:
1506 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1507 kfree(ec_ecdt);
1508 ec_ecdt = NULL;
1510 return -ENODEV;
1513 static int __init acpi_ec_init(void)
1515 int result = 0;
1518 if (acpi_disabled)
1519 return 0;
1521 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1522 if (!acpi_ec_dir)
1523 return -ENODEV;
1525 /* Now register the driver for the EC */
1526 result = acpi_bus_register_driver(&acpi_ec_driver);
1527 if (result < 0) {
1528 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1529 return -ENODEV;
1532 return result;
1535 subsys_initcall(acpi_ec_init);
1537 /* EC driver currently not unloadable */
1538 #if 0
1539 static void __exit acpi_ec_exit(void)
1542 acpi_bus_unregister_driver(&acpi_ec_driver);
1544 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1546 return;
1548 #endif /* 0 */
1550 static int __init acpi_fake_ecdt_setup(char *str)
1552 acpi_fake_ecdt_enabled = 1;
1553 return 1;
1556 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1557 static int __init acpi_ec_set_intr_mode(char *str)
1559 int intr;
1561 if (!get_option(&str, &intr))
1562 return 0;
1564 if (intr) {
1565 acpi_ec_poll_mode = EC_INTR;
1566 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1567 } else {
1568 acpi_ec_poll_mode = EC_POLL;
1569 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1571 printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1572 return 1;
1575 __setup("ec_intr=", acpi_ec_set_intr_mode);