2 * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
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_POLLING 0xFF
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_burst_add(struct acpi_device *device);
69 static int acpi_ec_polling_add(struct acpi_device *device);
71 static struct acpi_driver acpi_ec_driver = {
72 .name = ACPI_EC_DRIVER_NAME,
73 .class = ACPI_EC_CLASS,
76 .add = acpi_ec_polling_add,
77 .remove = acpi_ec_remove,
78 .start = acpi_ec_start,
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;
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;
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;
123 static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event);
124 static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event);
125 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data);
126 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data);
127 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data);
128 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data);
129 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data);
130 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data);
131 static void acpi_ec_gpe_polling_query(void *ec_cxt);
132 static void acpi_ec_gpe_burst_query(void *ec_cxt);
133 static u32 acpi_ec_gpe_polling_handler(void *data);
134 static u32 acpi_ec_gpe_burst_handler(void *data);
135 static acpi_status __init
136 acpi_fake_ecdt_polling_callback(acpi_handle handle,
137 u32 Level, void *context, void **retval);
139 static acpi_status __init
140 acpi_fake_ecdt_burst_callback(acpi_handle handle,
141 u32 Level, void *context, void **retval);
143 static int __init acpi_ec_polling_get_real_ecdt(void);
144 static int __init acpi_ec_burst_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_polling_mode = EC_POLLING;
152 /* --------------------------------------------------------------------------
153 Transaction Management
154 -------------------------------------------------------------------------- */
156 static inline u32 acpi_ec_read_status(union acpi_ec *ec)
160 acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
164 static int acpi_ec_wait(union acpi_ec *ec, u8 event)
166 if (acpi_ec_polling_mode)
167 return acpi_ec_polling_wait(ec, event);
169 return acpi_ec_burst_wait(ec, event);
172 static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event)
174 u32 acpi_ec_status = 0;
175 u32 i = ACPI_EC_UDELAY_COUNT;
180 /* Poll the EC status register waiting for the event to occur. */
182 case ACPI_EC_EVENT_OBF:
184 acpi_hw_low_level_read(8, &acpi_ec_status,
185 &ec->common.status_addr);
186 if (acpi_ec_status & ACPI_EC_FLAG_OBF)
188 udelay(ACPI_EC_UDELAY);
191 case ACPI_EC_EVENT_IBE:
193 acpi_hw_low_level_read(8, &acpi_ec_status,
194 &ec->common.status_addr);
195 if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
197 udelay(ACPI_EC_UDELAY);
206 static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event)
210 ACPI_FUNCTION_TRACE("acpi_ec_wait");
212 ec->burst.expect_event = event;
215 result = wait_event_interruptible_timeout(ec->burst.wait,
216 !ec->burst.expect_event,
220 ec->burst.expect_event = 0;
224 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, " result = %d ", result));
225 return_VALUE(result);
229 * Verify that the event in question has actually happened by
230 * querying EC status. Do the check even if operation timed-out
231 * to make sure that we did not miss interrupt.
234 case ACPI_EC_EVENT_OBF:
235 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
239 case ACPI_EC_EVENT_IBE:
240 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
245 return_VALUE(-ETIME);
248 static int acpi_ec_enter_burst_mode(union acpi_ec *ec)
253 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
255 status = acpi_ec_read_status(ec);
256 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
257 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
258 &ec->common.command_addr);
259 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
261 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
262 return_VALUE(-EINVAL);
264 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
265 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
266 if (tmp != 0x90) { /* Burst ACK byte */
267 return_VALUE(-EINVAL);
271 atomic_set(&ec->burst.leaving_burst, 0);
275 static int acpi_ec_leave_burst_mode(union acpi_ec *ec)
279 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
281 atomic_set(&ec->burst.leaving_burst, 1);
282 status = acpi_ec_read_status(ec);
283 if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
284 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE,
285 &ec->common.command_addr);
286 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
288 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
289 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
290 "------->wait fail\n"));
291 return_VALUE(-EINVAL);
293 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
294 status = acpi_ec_read_status(ec);
300 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
302 if (acpi_ec_polling_mode)
303 return acpi_ec_polling_read(ec, address, data);
305 return acpi_ec_burst_read(ec, address, data);
307 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
309 if (acpi_ec_polling_mode)
310 return acpi_ec_polling_write(ec, address, data);
312 return acpi_ec_burst_write(ec, address, data);
314 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data)
316 acpi_status status = AE_OK;
318 unsigned long flags = 0;
321 ACPI_FUNCTION_TRACE("acpi_ec_read");
324 return_VALUE(-EINVAL);
328 if (ec->common.global_lock) {
329 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
330 if (ACPI_FAILURE(status))
331 return_VALUE(-ENODEV);
334 spin_lock_irqsave(&ec->polling.lock, flags);
336 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
337 &ec->common.command_addr);
338 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
342 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
343 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
347 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
349 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
353 spin_unlock_irqrestore(&ec->polling.lock, flags);
355 if (ec->common.global_lock)
356 acpi_release_global_lock(glk);
358 return_VALUE(result);
361 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data)
364 acpi_status status = AE_OK;
365 unsigned long flags = 0;
368 ACPI_FUNCTION_TRACE("acpi_ec_write");
371 return_VALUE(-EINVAL);
373 if (ec->common.global_lock) {
374 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
375 if (ACPI_FAILURE(status))
376 return_VALUE(-ENODEV);
379 spin_lock_irqsave(&ec->polling.lock, flags);
381 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
382 &ec->common.command_addr);
383 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
387 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
388 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
392 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
393 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
397 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
401 spin_unlock_irqrestore(&ec->polling.lock, flags);
403 if (ec->common.global_lock)
404 acpi_release_global_lock(glk);
406 return_VALUE(result);
409 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data)
414 ACPI_FUNCTION_TRACE("acpi_ec_read");
417 return_VALUE(-EINVAL);
422 if (ec->common.global_lock) {
423 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
424 if (ACPI_FAILURE(status))
425 return_VALUE(-ENODEV);
428 WARN_ON(in_interrupt());
429 down(&ec->burst.sem);
431 if (acpi_ec_enter_burst_mode(ec))
434 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
435 &ec->common.command_addr);
436 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
437 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
442 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
443 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
445 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
449 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
450 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
452 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
456 acpi_ec_leave_burst_mode(ec);
459 if (ec->common.global_lock)
460 acpi_release_global_lock(glk);
462 if (atomic_read(&ec->burst.leaving_burst) == 2) {
463 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
464 while (atomic_read(&ec->burst.pending_gpe)) {
467 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
471 return_VALUE(status);
474 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data)
480 ACPI_FUNCTION_TRACE("acpi_ec_write");
483 return_VALUE(-EINVAL);
485 if (ec->common.global_lock) {
486 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
487 if (ACPI_FAILURE(status))
488 return_VALUE(-ENODEV);
491 WARN_ON(in_interrupt());
492 down(&ec->burst.sem);
494 if (acpi_ec_enter_burst_mode(ec))
497 status = acpi_ec_read_status(ec);
498 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
499 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
500 &ec->common.command_addr);
501 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
504 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
505 if (tmp != 0x90) /* Burst ACK byte */
508 /*Now we are in burst mode */
510 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
511 &ec->common.command_addr);
512 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
513 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
518 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
519 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
521 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
525 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
526 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
527 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
535 acpi_ec_leave_burst_mode(ec);
538 if (ec->common.global_lock)
539 acpi_release_global_lock(glk);
541 if (atomic_read(&ec->burst.leaving_burst) == 2) {
542 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
543 while (atomic_read(&ec->burst.pending_gpe)) {
546 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
550 return_VALUE(status);
554 * Externally callable EC access functions. For now, assume 1 EC only
556 int ec_read(u8 addr, u8 * val)
565 ec = acpi_driver_data(first_ec);
567 err = acpi_ec_read(ec, addr, &temp_data);
576 EXPORT_SYMBOL(ec_read);
578 int ec_write(u8 addr, u8 val)
586 ec = acpi_driver_data(first_ec);
588 err = acpi_ec_write(ec, addr, val);
593 EXPORT_SYMBOL(ec_write);
595 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
597 if (acpi_ec_polling_mode)
598 return acpi_ec_polling_query(ec, data);
600 return acpi_ec_burst_query(ec, data);
602 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data)
605 acpi_status status = AE_OK;
606 unsigned long flags = 0;
609 ACPI_FUNCTION_TRACE("acpi_ec_query");
612 return_VALUE(-EINVAL);
616 if (ec->common.global_lock) {
617 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
618 if (ACPI_FAILURE(status))
619 return_VALUE(-ENODEV);
623 * Query the EC to find out which _Qxx method we need to evaluate.
624 * Note that successful completion of the query causes the ACPI_EC_SCI
625 * bit to be cleared (and thus clearing the interrupt source).
627 spin_lock_irqsave(&ec->polling.lock, flags);
629 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
630 &ec->common.command_addr);
631 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
635 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
640 spin_unlock_irqrestore(&ec->polling.lock, flags);
642 if (ec->common.global_lock)
643 acpi_release_global_lock(glk);
645 return_VALUE(result);
647 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data)
652 ACPI_FUNCTION_TRACE("acpi_ec_query");
655 return_VALUE(-EINVAL);
658 if (ec->common.global_lock) {
659 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
660 if (ACPI_FAILURE(status))
661 return_VALUE(-ENODEV);
664 down(&ec->burst.sem);
665 if (acpi_ec_enter_burst_mode(ec))
668 * Query the EC to find out which _Qxx method we need to evaluate.
669 * Note that successful completion of the query causes the ACPI_EC_SCI
670 * bit to be cleared (and thus clearing the interrupt source).
672 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
673 &ec->common.command_addr);
674 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
676 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
680 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
681 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
686 acpi_ec_leave_burst_mode(ec);
689 if (ec->common.global_lock)
690 acpi_release_global_lock(glk);
692 if (atomic_read(&ec->burst.leaving_burst) == 2) {
693 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aborted, retry ...\n"));
694 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
697 return_VALUE(status);
700 /* --------------------------------------------------------------------------
702 -------------------------------------------------------------------------- */
704 union acpi_ec_query_data {
709 static void acpi_ec_gpe_query(void *ec_cxt)
711 if (acpi_ec_polling_mode)
712 acpi_ec_gpe_polling_query(ec_cxt);
714 acpi_ec_gpe_burst_query(ec_cxt);
717 static void acpi_ec_gpe_polling_query(void *ec_cxt)
719 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
721 unsigned long flags = 0;
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'
727 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
732 spin_lock_irqsave(&ec->polling.lock, flags);
733 acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
734 spin_unlock_irqrestore(&ec->polling.lock, flags);
736 /* TBD: Implement asynch events!
737 * NOTE: All we care about are EC-SCI's. Other EC events are
738 * handled via polling (yuck!). This is because some systems
739 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
740 * a purely interrupt-driven approach (grumble, grumble).
742 if (!(value & ACPI_EC_FLAG_SCI))
745 if (acpi_ec_query(ec, &value))
748 object_name[2] = hex[((value >> 4) & 0x0F)];
749 object_name[3] = hex[(value & 0x0F)];
751 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
753 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
756 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
758 static void acpi_ec_gpe_burst_query(void *ec_cxt)
760 union acpi_ec *ec = (union acpi_ec *)ec_cxt;
762 int result = -ENODATA;
763 static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
764 const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
765 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
768 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
770 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
771 result = acpi_ec_query(ec, &value);
776 object_name[2] = hex[((value >> 4) & 0x0F)];
777 object_name[3] = hex[(value & 0x0F)];
779 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
781 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
783 atomic_dec(&ec->burst.pending_gpe);
787 static u32 acpi_ec_gpe_handler(void *data)
789 if (acpi_ec_polling_mode)
790 return acpi_ec_gpe_polling_handler(data);
792 return acpi_ec_gpe_burst_handler(data);
794 static u32 acpi_ec_gpe_polling_handler(void *data)
796 acpi_status status = AE_OK;
797 union acpi_ec *ec = (union acpi_ec *)data;
800 return ACPI_INTERRUPT_NOT_HANDLED;
802 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
804 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
805 acpi_ec_gpe_query, ec);
808 return ACPI_INTERRUPT_HANDLED;
810 return ACPI_INTERRUPT_NOT_HANDLED;
812 static u32 acpi_ec_gpe_burst_handler(void *data)
814 acpi_status status = AE_OK;
816 union acpi_ec *ec = (union acpi_ec *)data;
819 return ACPI_INTERRUPT_NOT_HANDLED;
821 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
823 value = acpi_ec_read_status(ec);
825 if ((value & ACPI_EC_FLAG_IBF) &&
826 !(value & ACPI_EC_FLAG_BURST) &&
827 (atomic_read(&ec->burst.leaving_burst) == 0)) {
829 * the embedded controller disables
830 * burst mode for any reason other
831 * than the burst disable command
832 * to process critical event.
834 atomic_set(&ec->burst.leaving_burst, 2); /* block current pending transaction
836 wake_up(&ec->burst.wait);
838 if ((ec->burst.expect_event == ACPI_EC_EVENT_OBF &&
839 (value & ACPI_EC_FLAG_OBF)) ||
840 (ec->burst.expect_event == ACPI_EC_EVENT_IBE &&
841 !(value & ACPI_EC_FLAG_IBF))) {
842 ec->burst.expect_event = 0;
843 wake_up(&ec->burst.wait);
844 return ACPI_INTERRUPT_HANDLED;
848 if (value & ACPI_EC_FLAG_SCI) {
849 atomic_add(1, &ec->burst.pending_gpe);
850 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
851 acpi_ec_gpe_query, ec);
852 return status == AE_OK ?
853 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
855 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
856 return status == AE_OK ?
857 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
860 /* --------------------------------------------------------------------------
861 Address Space Management
862 -------------------------------------------------------------------------- */
865 acpi_ec_space_setup(acpi_handle region_handle,
866 u32 function, void *handler_context, void **return_context)
869 * The EC object is in the handler context and is needed
870 * when calling the acpi_ec_space_handler.
872 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
873 handler_context : NULL;
879 acpi_ec_space_handler(u32 function,
880 acpi_physical_address address,
882 acpi_integer * value,
883 void *handler_context, void *region_context)
886 union acpi_ec *ec = NULL;
888 acpi_integer f_v = 0;
891 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
893 if ((address > 0xFF) || !value || !handler_context)
894 return_VALUE(AE_BAD_PARAMETER);
896 if (bit_width != 8 && acpi_strict) {
897 printk(KERN_WARNING PREFIX
898 "acpi_ec_space_handler: bit_width should be 8\n");
899 return_VALUE(AE_BAD_PARAMETER);
902 ec = (union acpi_ec *)handler_context;
908 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
911 result = acpi_ec_write(ec, (u8) address, (u8) temp);
921 if (function == ACPI_READ)
922 f_v |= temp << 8 * i;
923 if (function == ACPI_WRITE)
930 if (function == ACPI_READ) {
931 f_v |= temp << 8 * i;
938 return_VALUE(AE_BAD_PARAMETER);
941 return_VALUE(AE_NOT_FOUND);
944 return_VALUE(AE_TIME);
951 /* --------------------------------------------------------------------------
953 -------------------------------------------------------------------------- */
955 static struct proc_dir_entry *acpi_ec_dir;
957 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
959 union acpi_ec *ec = (union acpi_ec *)seq->private;
961 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
966 seq_printf(seq, "gpe bit: 0x%02x\n",
967 (u32) ec->common.gpe_bit);
968 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
969 (u32) ec->common.status_addr.address,
970 (u32) ec->common.data_addr.address);
971 seq_printf(seq, "use global lock: %s\n",
972 ec->common.global_lock ? "yes" : "no");
973 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
979 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
981 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
984 static struct file_operations acpi_ec_info_ops = {
985 .open = acpi_ec_info_open_fs,
988 .release = single_release,
989 .owner = THIS_MODULE,
992 static int acpi_ec_add_fs(struct acpi_device *device)
994 struct proc_dir_entry *entry = NULL;
996 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
998 if (!acpi_device_dir(device)) {
999 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1001 if (!acpi_device_dir(device))
1002 return_VALUE(-ENODEV);
1005 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
1006 acpi_device_dir(device));
1008 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1009 "Unable to create '%s' fs entry\n",
1010 ACPI_EC_FILE_INFO));
1012 entry->proc_fops = &acpi_ec_info_ops;
1013 entry->data = acpi_driver_data(device);
1014 entry->owner = THIS_MODULE;
1020 static int acpi_ec_remove_fs(struct acpi_device *device)
1022 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
1024 if (acpi_device_dir(device)) {
1025 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
1026 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
1027 acpi_device_dir(device) = NULL;
1033 /* --------------------------------------------------------------------------
1035 -------------------------------------------------------------------------- */
1037 static int acpi_ec_polling_add(struct acpi_device *device)
1040 acpi_status status = AE_OK;
1041 union acpi_ec *ec = NULL;
1044 ACPI_FUNCTION_TRACE("acpi_ec_add");
1047 return_VALUE(-EINVAL);
1049 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1051 return_VALUE(-ENOMEM);
1052 memset(ec, 0, sizeof(union acpi_ec));
1054 ec->common.handle = device->handle;
1055 ec->common.uid = -1;
1056 spin_lock_init(&ec->polling.lock);
1057 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1058 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1059 acpi_driver_data(device) = ec;
1061 /* Use the global lock for all EC transactions? */
1062 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1063 &ec->common.global_lock);
1065 /* If our UID matches the UID for the ECDT-enumerated EC,
1066 we now have the *real* EC info, so kill the makeshift one. */
1067 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1068 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1069 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1071 &acpi_ec_space_handler);
1073 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1074 &acpi_ec_gpe_handler);
1079 /* Get GPE bit assignment (EC events). */
1080 /* TODO: Add support for _GPE returning a package */
1082 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1083 &ec->common.gpe_bit);
1084 if (ACPI_FAILURE(status)) {
1085 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1086 "Error obtaining GPE bit assignment\n"));
1091 result = acpi_ec_add_fs(device);
1095 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1096 acpi_device_name(device), acpi_device_bid(device),
1097 (u32) ec->common.gpe_bit);
1106 return_VALUE(result);
1108 static int acpi_ec_burst_add(struct acpi_device *device)
1111 acpi_status status = AE_OK;
1112 union acpi_ec *ec = NULL;
1115 ACPI_FUNCTION_TRACE("acpi_ec_add");
1118 return_VALUE(-EINVAL);
1120 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1122 return_VALUE(-ENOMEM);
1123 memset(ec, 0, sizeof(union acpi_ec));
1125 ec->common.handle = device->handle;
1126 ec->common.uid = -1;
1127 atomic_set(&ec->burst.pending_gpe, 0);
1128 atomic_set(&ec->burst.leaving_burst, 1);
1129 init_MUTEX(&ec->burst.sem);
1130 init_waitqueue_head(&ec->burst.wait);
1131 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1132 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1133 acpi_driver_data(device) = ec;
1135 /* Use the global lock for all EC transactions? */
1136 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1137 &ec->common.global_lock);
1139 /* If our UID matches the UID for the ECDT-enumerated EC,
1140 we now have the *real* EC info, so kill the makeshift one. */
1141 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1142 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1143 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1145 &acpi_ec_space_handler);
1147 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1148 &acpi_ec_gpe_handler);
1153 /* Get GPE bit assignment (EC events). */
1154 /* TODO: Add support for _GPE returning a package */
1156 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1157 &ec->common.gpe_bit);
1158 if (ACPI_FAILURE(status)) {
1159 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1160 "Error obtaining GPE bit assignment\n"));
1165 result = acpi_ec_add_fs(device);
1169 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1170 acpi_device_name(device), acpi_device_bid(device),
1171 (u32) ec->common.gpe_bit);
1180 return_VALUE(result);
1183 static int acpi_ec_remove(struct acpi_device *device, int type)
1185 union acpi_ec *ec = NULL;
1187 ACPI_FUNCTION_TRACE("acpi_ec_remove");
1190 return_VALUE(-EINVAL);
1192 ec = acpi_driver_data(device);
1194 acpi_ec_remove_fs(device);
1202 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1204 union acpi_ec *ec = (union acpi_ec *)context;
1205 struct acpi_generic_address *addr;
1207 if (resource->id != ACPI_RSTYPE_IO) {
1212 * The first address region returned is the data port, and
1213 * the second address region returned is the status/command
1216 if (ec->common.data_addr.register_bit_width == 0) {
1217 addr = &ec->common.data_addr;
1218 } else if (ec->common.command_addr.register_bit_width == 0) {
1219 addr = &ec->common.command_addr;
1221 return AE_CTRL_TERMINATE;
1224 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1225 addr->register_bit_width = 8;
1226 addr->register_bit_offset = 0;
1227 addr->address = resource->data.io.min_base_address;
1232 static int acpi_ec_start(struct acpi_device *device)
1234 acpi_status status = AE_OK;
1235 union acpi_ec *ec = NULL;
1237 ACPI_FUNCTION_TRACE("acpi_ec_start");
1240 return_VALUE(-EINVAL);
1242 ec = acpi_driver_data(device);
1245 return_VALUE(-EINVAL);
1248 * Get I/O port addresses. Convert to GAS format.
1250 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1251 acpi_ec_io_ports, ec);
1252 if (ACPI_FAILURE(status)
1253 || ec->common.command_addr.register_bit_width == 0) {
1254 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1255 "Error getting I/O port addresses"));
1256 return_VALUE(-ENODEV);
1259 ec->common.status_addr = ec->common.command_addr;
1261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1262 (u32) ec->common.gpe_bit,
1263 (u32) ec->common.command_addr.address,
1264 (u32) ec->common.data_addr.address));
1267 * Install GPE handler
1269 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1270 ACPI_GPE_EDGE_TRIGGERED,
1271 &acpi_ec_gpe_handler, ec);
1272 if (ACPI_FAILURE(status)) {
1273 return_VALUE(-ENODEV);
1275 acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1276 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1278 status = acpi_install_address_space_handler(ec->common.handle,
1280 &acpi_ec_space_handler,
1281 &acpi_ec_space_setup, ec);
1282 if (ACPI_FAILURE(status)) {
1283 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1284 &acpi_ec_gpe_handler);
1285 return_VALUE(-ENODEV);
1288 return_VALUE(AE_OK);
1291 static int acpi_ec_stop(struct acpi_device *device, int type)
1293 acpi_status status = AE_OK;
1294 union acpi_ec *ec = NULL;
1296 ACPI_FUNCTION_TRACE("acpi_ec_stop");
1299 return_VALUE(-EINVAL);
1301 ec = acpi_driver_data(device);
1303 status = acpi_remove_address_space_handler(ec->common.handle,
1305 &acpi_ec_space_handler);
1306 if (ACPI_FAILURE(status))
1307 return_VALUE(-ENODEV);
1310 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1311 &acpi_ec_gpe_handler);
1312 if (ACPI_FAILURE(status))
1313 return_VALUE(-ENODEV);
1318 static acpi_status __init
1319 acpi_fake_ecdt_callback(acpi_handle handle,
1320 u32 Level, void *context, void **retval)
1323 if (acpi_ec_polling_mode)
1324 return acpi_fake_ecdt_polling_callback(handle,
1325 Level, context, retval);
1327 return acpi_fake_ecdt_burst_callback(handle,
1328 Level, context, retval);
1331 static acpi_status __init
1332 acpi_fake_ecdt_polling_callback(acpi_handle handle,
1333 u32 Level, void *context, void **retval)
1337 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1338 acpi_ec_io_ports, ec_ecdt);
1339 if (ACPI_FAILURE(status))
1341 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1343 ec_ecdt->common.uid = -1;
1344 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1347 acpi_evaluate_integer(handle, "_GPE", NULL,
1348 &ec_ecdt->common.gpe_bit);
1349 if (ACPI_FAILURE(status))
1351 spin_lock_init(&ec_ecdt->polling.lock);
1352 ec_ecdt->common.global_lock = TRUE;
1353 ec_ecdt->common.handle = handle;
1355 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1356 (u32) ec_ecdt->common.gpe_bit,
1357 (u32) ec_ecdt->common.command_addr.address,
1358 (u32) ec_ecdt->common.data_addr.address);
1360 return AE_CTRL_TERMINATE;
1363 static acpi_status __init
1364 acpi_fake_ecdt_burst_callback(acpi_handle handle,
1365 u32 Level, void *context, void **retval)
1369 init_MUTEX(&ec_ecdt->burst.sem);
1370 init_waitqueue_head(&ec_ecdt->burst.wait);
1371 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1372 acpi_ec_io_ports, ec_ecdt);
1373 if (ACPI_FAILURE(status))
1375 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1377 ec_ecdt->common.uid = -1;
1378 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1381 acpi_evaluate_integer(handle, "_GPE", NULL,
1382 &ec_ecdt->common.gpe_bit);
1383 if (ACPI_FAILURE(status))
1385 ec_ecdt->common.global_lock = TRUE;
1386 ec_ecdt->common.handle = handle;
1388 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1389 (u32) ec_ecdt->common.gpe_bit,
1390 (u32) ec_ecdt->common.command_addr.address,
1391 (u32) ec_ecdt->common.data_addr.address);
1393 return AE_CTRL_TERMINATE;
1397 * Some BIOS (such as some from Gateway laptops) access EC region very early
1398 * such as in BAT0._INI or EC._INI before an EC device is found and
1399 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1400 * required, but if EC regison is accessed early, it is required.
1401 * The routine tries to workaround the BIOS bug by pre-scan EC device
1402 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1403 * op region (since _REG isn't invoked yet). The assumption is true for
1404 * all systems found.
1406 static int __init acpi_ec_fake_ecdt(void)
1411 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1413 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1418 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1420 status = acpi_get_devices(ACPI_EC_HID,
1421 acpi_fake_ecdt_callback, NULL, NULL);
1422 if (ACPI_FAILURE(status)) {
1430 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1434 static int __init acpi_ec_get_real_ecdt(void)
1436 if (acpi_ec_polling_mode)
1437 return acpi_ec_polling_get_real_ecdt();
1439 return acpi_ec_burst_get_real_ecdt();
1442 static int __init acpi_ec_polling_get_real_ecdt(void)
1445 struct acpi_table_ecdt *ecdt_ptr;
1447 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1448 (struct acpi_table_header **)
1450 if (ACPI_FAILURE(status))
1453 printk(KERN_INFO PREFIX "Found ECDT\n");
1456 * Generate a temporary ec context to use until the namespace is scanned
1458 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1461 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1463 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1464 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1465 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1466 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1467 spin_lock_init(&ec_ecdt->polling.lock);
1468 /* use the GL just to be safe */
1469 ec_ecdt->common.global_lock = TRUE;
1470 ec_ecdt->common.uid = ecdt_ptr->uid;
1473 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1474 if (ACPI_FAILURE(status)) {
1480 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1487 static int __init acpi_ec_burst_get_real_ecdt(void)
1490 struct acpi_table_ecdt *ecdt_ptr;
1492 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1493 (struct acpi_table_header **)
1495 if (ACPI_FAILURE(status))
1498 printk(KERN_INFO PREFIX "Found ECDT\n");
1501 * Generate a temporary ec context to use until the namespace is scanned
1503 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1506 memset(ec_ecdt, 0, sizeof(union acpi_ec));
1508 init_MUTEX(&ec_ecdt->burst.sem);
1509 init_waitqueue_head(&ec_ecdt->burst.wait);
1510 ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1511 ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1512 ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1513 ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1514 /* use the GL just to be safe */
1515 ec_ecdt->common.global_lock = TRUE;
1516 ec_ecdt->common.uid = ecdt_ptr->uid;
1519 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1520 if (ACPI_FAILURE(status)) {
1526 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1533 static int __initdata acpi_fake_ecdt_enabled;
1534 int __init acpi_ec_ecdt_probe(void)
1539 ret = acpi_ec_get_real_ecdt();
1540 /* Try to make a fake ECDT */
1541 if (ret && acpi_fake_ecdt_enabled) {
1542 ret = acpi_ec_fake_ecdt();
1549 * Install GPE handler
1551 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1552 ACPI_GPE_EDGE_TRIGGERED,
1553 &acpi_ec_gpe_handler, ec_ecdt);
1554 if (ACPI_FAILURE(status)) {
1557 acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1558 acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1560 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1562 &acpi_ec_space_handler,
1563 &acpi_ec_space_setup,
1565 if (ACPI_FAILURE(status)) {
1566 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1567 &acpi_ec_gpe_handler);
1574 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1581 static int __init acpi_ec_init(void)
1585 ACPI_FUNCTION_TRACE("acpi_ec_init");
1590 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1592 return_VALUE(-ENODEV);
1594 /* Now register the driver for the EC */
1595 result = acpi_bus_register_driver(&acpi_ec_driver);
1597 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1598 return_VALUE(-ENODEV);
1601 return_VALUE(result);
1604 subsys_initcall(acpi_ec_init);
1606 /* EC driver currently not unloadable */
1608 static void __exit acpi_ec_exit(void)
1610 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1612 acpi_bus_unregister_driver(&acpi_ec_driver);
1614 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1620 static int __init acpi_fake_ecdt_setup(char *str)
1622 acpi_fake_ecdt_enabled = 1;
1626 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1627 static int __init acpi_ec_set_polling_mode(char *str)
1631 if (!get_option(&str, &burst))
1635 acpi_ec_polling_mode = EC_BURST;
1636 acpi_ec_driver.ops.add = acpi_ec_burst_add;
1638 acpi_ec_polling_mode = EC_POLLING;
1639 acpi_ec_driver.ops.add = acpi_ec_polling_add;
1641 printk(KERN_INFO PREFIX "EC %s mode.\n", burst ? "burst" : "polling");
1645 __setup("ec_burst=", acpi_ec_set_polling_mode);