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")
43 #define ACPI_EC_COMPONENT 0x00100000
44 #define ACPI_EC_CLASS "embedded_controller"
45 #define ACPI_EC_HID "PNP0C09"
46 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
47 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
48 #define ACPI_EC_FILE_INFO "info"
51 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
52 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
53 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
54 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
56 #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
57 #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
59 #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
60 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
62 #define ACPI_EC_COMMAND_READ 0x80
63 #define ACPI_EC_COMMAND_WRITE 0x81
64 #define ACPI_EC_BURST_ENABLE 0x82
65 #define ACPI_EC_BURST_DISABLE 0x83
66 #define ACPI_EC_COMMAND_QUERY 0x84
68 static int acpi_ec_add (struct acpi_device
*device
);
69 static int acpi_ec_remove (struct acpi_device
*device
, int type
);
70 static int acpi_ec_start (struct acpi_device
*device
);
71 static int acpi_ec_stop (struct acpi_device
*device
, int type
);
73 static struct acpi_driver acpi_ec_driver
= {
74 .name
= ACPI_EC_DRIVER_NAME
,
75 .class = ACPI_EC_CLASS
,
79 .remove
= acpi_ec_remove
,
80 .start
= acpi_ec_start
,
88 unsigned long gpe_bit
;
89 struct acpi_generic_address status_addr
;
90 struct acpi_generic_address command_addr
;
91 struct acpi_generic_address data_addr
;
92 unsigned long global_lock
;
93 unsigned int expect_event
;
94 atomic_t leaving_burst
; /* 0 : No, 1 : Yes, 2: abort*/
97 wait_queue_head_t wait
;
100 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
101 static struct acpi_ec
*ec_ecdt
;
103 /* External interfaces use first EC only, so remember */
104 static struct acpi_device
*first_ec
;
106 /* --------------------------------------------------------------------------
107 Transaction Management
108 -------------------------------------------------------------------------- */
110 static inline u32
acpi_ec_read_status(struct acpi_ec
*ec
)
114 acpi_hw_low_level_read(8, &status
, &ec
->status_addr
);
118 static int acpi_ec_wait(struct acpi_ec
*ec
, unsigned int event
)
122 ACPI_FUNCTION_TRACE("acpi_ec_wait");
124 ec
->expect_event
= event
;
127 result
= wait_event_interruptible_timeout(ec
->wait
,
129 msecs_to_jiffies(ACPI_EC_DELAY
));
131 ec
->expect_event
= 0;
135 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
," result = %d ", result
));
136 return_VALUE(result
);
140 * Verify that the event in question has actually happened by
141 * querying EC status. Do the check even if operation timed-out
142 * to make sure that we did not miss interrupt.
145 case ACPI_EC_EVENT_OBF
:
146 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_OBF
)
150 case ACPI_EC_EVENT_IBE
:
151 if (~acpi_ec_read_status(ec
) & ACPI_EC_FLAG_IBF
)
156 return_VALUE(-ETIME
);
162 acpi_ec_enter_burst_mode (
168 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
170 status
= acpi_ec_read_status(ec
);
171 if (status
!= -EINVAL
&&
172 !(status
& ACPI_EC_FLAG_BURST
)){
173 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE
, &ec
->command_addr
);
174 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF
);
176 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
177 return_VALUE(-EINVAL
);
179 acpi_hw_low_level_read(8, &tmp
, &ec
->data_addr
);
180 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
181 if(tmp
!= 0x90 ) {/* Burst ACK byte*/
182 return_VALUE(-EINVAL
);
186 atomic_set(&ec
->leaving_burst
, 0);
191 acpi_ec_leave_burst_mode (
196 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
198 atomic_set(&ec
->leaving_burst
, 1);
199 status
= acpi_ec_read_status(ec
);
200 if (status
!= -EINVAL
&&
201 (status
& ACPI_EC_FLAG_BURST
)){
202 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE
, &ec
->command_addr
);
203 status
= acpi_ec_wait(ec
, ACPI_EC_FLAG_IBF
);
205 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
206 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,"------->wait fail\n"));
207 return_VALUE(-EINVAL
);
209 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
210 status
= acpi_ec_read_status(ec
);
225 ACPI_FUNCTION_TRACE("acpi_ec_read");
228 return_VALUE(-EINVAL
);
233 if (ec
->global_lock
) {
234 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
235 if (ACPI_FAILURE(status
))
236 return_VALUE(-ENODEV
);
239 WARN_ON(in_interrupt());
242 if(acpi_ec_enter_burst_mode(ec
))
245 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ
, &ec
->command_addr
);
246 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBE
);
247 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
252 acpi_hw_low_level_write(8, address
, &ec
->data_addr
);
253 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF
);
255 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
259 acpi_hw_low_level_read(8, data
, &ec
->data_addr
);
260 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Read [%02x] from address [%02x]\n",
266 acpi_ec_leave_burst_mode(ec
);
270 acpi_release_global_lock(glk
);
272 if(atomic_read(&ec
->leaving_burst
) == 2){
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,"aborted, retry ...\n"));
274 while(atomic_read(&ec
->pending_gpe
)){
277 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
281 return_VALUE(status
);
295 ACPI_FUNCTION_TRACE("acpi_ec_write");
298 return_VALUE(-EINVAL
);
300 if (ec
->global_lock
) {
301 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
302 if (ACPI_FAILURE(status
))
303 return_VALUE(-ENODEV
);
306 WARN_ON(in_interrupt());
309 if(acpi_ec_enter_burst_mode(ec
))
312 status
= acpi_ec_read_status(ec
);
313 if (status
!= -EINVAL
&&
314 !(status
& ACPI_EC_FLAG_BURST
)){
315 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE
, &ec
->command_addr
);
316 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF
);
319 acpi_hw_low_level_read(8, &tmp
, &ec
->data_addr
);
320 if(tmp
!= 0x90 ) /* Burst ACK byte*/
323 /*Now we are in burst mode*/
325 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE
, &ec
->command_addr
);
326 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBE
);
327 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
332 acpi_hw_low_level_write(8, address
, &ec
->data_addr
);
333 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBE
);
335 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
339 acpi_hw_low_level_write(8, data
, &ec
->data_addr
);
340 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBE
);
341 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Wrote [%02x] to address [%02x]\n",
349 acpi_ec_leave_burst_mode(ec
);
353 acpi_release_global_lock(glk
);
355 if(atomic_read(&ec
->leaving_burst
) == 2){
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,"aborted, retry ...\n"));
357 while(atomic_read(&ec
->pending_gpe
)){
360 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
364 return_VALUE(status
);
368 * Externally callable EC access functions. For now, assume 1 EC only
371 ec_read(u8 addr
, u8
*val
)
380 ec
= acpi_driver_data(first_ec
);
382 err
= acpi_ec_read(ec
, addr
, &temp_data
);
391 EXPORT_SYMBOL(ec_read
);
394 ec_write(u8 addr
, u8 val
)
402 ec
= acpi_driver_data(first_ec
);
404 err
= acpi_ec_write(ec
, addr
, val
);
408 EXPORT_SYMBOL(ec_write
);
419 ACPI_FUNCTION_TRACE("acpi_ec_query");
422 return_VALUE(-EINVAL
);
425 if (ec
->global_lock
) {
426 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
427 if (ACPI_FAILURE(status
))
428 return_VALUE(-ENODEV
);
432 if(acpi_ec_enter_burst_mode(ec
))
435 * Query the EC to find out which _Qxx method we need to evaluate.
436 * Note that successful completion of the query causes the ACPI_EC_SCI
437 * bit to be cleared (and thus clearing the interrupt source).
439 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY
, &ec
->command_addr
);
440 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF
);
442 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
446 acpi_hw_low_level_read(8, data
, &ec
->data_addr
);
447 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
452 acpi_ec_leave_burst_mode(ec
);
456 acpi_release_global_lock(glk
);
458 if(atomic_read(&ec
->leaving_burst
) == 2){
459 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,"aborted, retry ...\n"));
460 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
463 return_VALUE(status
);
467 /* --------------------------------------------------------------------------
469 -------------------------------------------------------------------------- */
471 struct acpi_ec_query_data
{
480 struct acpi_ec
*ec
= (struct acpi_ec
*) ec_cxt
;
482 int result
= -ENODATA
;
483 static char object_name
[5] = {'_','Q','0','0','\0'};
484 const char hex
[] = {'0','1','2','3','4','5','6','7',
485 '8','9','A','B','C','D','E','F'};
487 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
489 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_SCI
)
490 result
= acpi_ec_query(ec
, &value
);
495 object_name
[2] = hex
[((value
>> 4) & 0x0F)];
496 object_name
[3] = hex
[(value
& 0x0F)];
498 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Evaluating %s\n", object_name
));
500 acpi_evaluate_object(ec
->handle
, object_name
, NULL
, NULL
);
502 atomic_dec(&ec
->pending_gpe
);
507 acpi_ec_gpe_handler (
510 acpi_status status
= AE_OK
;
512 struct acpi_ec
*ec
= (struct acpi_ec
*) data
;
515 return ACPI_INTERRUPT_NOT_HANDLED
;
517 acpi_disable_gpe(NULL
, ec
->gpe_bit
, ACPI_ISR
);
519 value
= acpi_ec_read_status(ec
);
521 if((value
& ACPI_EC_FLAG_IBF
) &&
522 !(value
& ACPI_EC_FLAG_BURST
) &&
523 (atomic_read(&ec
->leaving_burst
) == 0)) {
525 * the embedded controller disables
526 * burst mode for any reason other
527 * than the burst disable command
528 * to process critical event.
530 atomic_set(&ec
->leaving_burst
, 2); /* block current pending transaction
534 if ((ec
->expect_event
== ACPI_EC_EVENT_OBF
&&
535 (value
& ACPI_EC_FLAG_OBF
)) ||
536 (ec
->expect_event
== ACPI_EC_EVENT_IBE
&&
537 !(value
& ACPI_EC_FLAG_IBF
))) {
538 ec
->expect_event
= 0;
540 return ACPI_INTERRUPT_HANDLED
;
544 if (value
& ACPI_EC_FLAG_SCI
){
545 atomic_add(1, &ec
->pending_gpe
) ;
546 status
= acpi_os_queue_for_execution(OSD_PRIORITY_GPE
,
547 acpi_ec_gpe_query
, ec
);
548 return status
== AE_OK
?
549 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
551 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_ISR
);
552 return status
== AE_OK
?
553 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
556 /* --------------------------------------------------------------------------
557 Address Space Management
558 -------------------------------------------------------------------------- */
561 acpi_ec_space_setup (
562 acpi_handle region_handle
,
564 void *handler_context
,
565 void **return_context
)
568 * The EC object is in the handler context and is needed
569 * when calling the acpi_ec_space_handler.
571 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
572 handler_context
: NULL
;
579 acpi_ec_space_handler (
581 acpi_physical_address address
,
584 void *handler_context
,
585 void *region_context
)
588 struct acpi_ec
*ec
= NULL
;
590 acpi_integer f_v
= 0;
593 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
595 if ((address
> 0xFF) || !value
|| !handler_context
)
596 return_VALUE(AE_BAD_PARAMETER
);
598 if (bit_width
!= 8 && acpi_strict
) {
599 printk(KERN_WARNING PREFIX
"acpi_ec_space_handler: bit_width should be 8\n");
600 return_VALUE(AE_BAD_PARAMETER
);
603 ec
= (struct acpi_ec
*) handler_context
;
609 result
= acpi_ec_read(ec
, (u8
) address
, (u32
*)&temp
);
612 result
= acpi_ec_write(ec
, (u8
) address
, (u8
) temp
);
622 if (function
== ACPI_READ
)
623 f_v
|= temp
<< 8 * i
;
624 if (function
== ACPI_WRITE
)
631 if (function
== ACPI_READ
) {
632 f_v
|= temp
<< 8 * i
;
640 return_VALUE(AE_BAD_PARAMETER
);
643 return_VALUE(AE_NOT_FOUND
);
646 return_VALUE(AE_TIME
);
654 /* --------------------------------------------------------------------------
656 -------------------------------------------------------------------------- */
658 static struct proc_dir_entry
*acpi_ec_dir
;
662 acpi_ec_read_info (struct seq_file
*seq
, void *offset
)
664 struct acpi_ec
*ec
= (struct acpi_ec
*) seq
->private;
666 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
671 seq_printf(seq
, "gpe bit: 0x%02x\n",
673 seq_printf(seq
, "ports: 0x%02x, 0x%02x\n",
674 (u32
) ec
->status_addr
.address
, (u32
) ec
->data_addr
.address
);
675 seq_printf(seq
, "use global lock: %s\n",
676 ec
->global_lock
?"yes":"no");
677 acpi_enable_gpe(NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
683 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
685 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
688 static struct file_operations acpi_ec_info_ops
= {
689 .open
= acpi_ec_info_open_fs
,
692 .release
= single_release
,
693 .owner
= THIS_MODULE
,
698 struct acpi_device
*device
)
700 struct proc_dir_entry
*entry
;
702 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
704 if (!acpi_device_dir(device
)) {
705 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
707 if (!acpi_device_dir(device
))
708 return_VALUE(-ENODEV
);
711 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
712 acpi_device_dir(device
));
714 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
715 "Unable to create '%s' fs entry\n",
718 entry
->proc_fops
= &acpi_ec_info_ops
;
719 entry
->data
= acpi_driver_data(device
);
720 entry
->owner
= THIS_MODULE
;
729 struct acpi_device
*device
)
731 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
733 if (acpi_device_dir(device
)) {
734 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
735 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
736 acpi_device_dir(device
) = NULL
;
743 /* --------------------------------------------------------------------------
745 -------------------------------------------------------------------------- */
749 struct acpi_device
*device
)
756 ACPI_FUNCTION_TRACE("acpi_ec_add");
759 return_VALUE(-EINVAL
);
761 ec
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
763 return_VALUE(-ENOMEM
);
764 memset(ec
, 0, sizeof(struct acpi_ec
));
766 ec
->handle
= device
->handle
;
768 atomic_set(&ec
->pending_gpe
, 0);
769 atomic_set(&ec
->leaving_burst
, 1);
770 init_MUTEX(&ec
->sem
);
771 init_waitqueue_head(&ec
->wait
);
772 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
773 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
774 acpi_driver_data(device
) = ec
;
776 /* Use the global lock for all EC transactions? */
777 acpi_evaluate_integer(ec
->handle
, "_GLK", NULL
, &ec
->global_lock
);
779 /* If our UID matches the UID for the ECDT-enumerated EC,
780 we now have the *real* EC info, so kill the makeshift one.*/
781 acpi_evaluate_integer(ec
->handle
, "_UID", NULL
, &uid
);
782 if (ec_ecdt
&& ec_ecdt
->uid
== uid
) {
783 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT
,
784 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
);
786 acpi_remove_gpe_handler(NULL
, ec_ecdt
->gpe_bit
, &acpi_ec_gpe_handler
);
791 /* Get GPE bit assignment (EC events). */
792 /* TODO: Add support for _GPE returning a package */
793 status
= acpi_evaluate_integer(ec
->handle
, "_GPE", NULL
, &ec
->gpe_bit
);
794 if (ACPI_FAILURE(status
)) {
795 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
796 "Error obtaining GPE bit assignment\n"));
801 result
= acpi_ec_add_fs(device
);
805 printk(KERN_INFO PREFIX
"%s [%s] (gpe %d)\n",
806 acpi_device_name(device
), acpi_device_bid(device
),
816 return_VALUE(result
);
822 struct acpi_device
*device
,
827 ACPI_FUNCTION_TRACE("acpi_ec_remove");
830 return_VALUE(-EINVAL
);
832 ec
= acpi_driver_data(device
);
834 acpi_ec_remove_fs(device
);
844 struct acpi_resource
*resource
,
847 struct acpi_ec
*ec
= (struct acpi_ec
*) context
;
848 struct acpi_generic_address
*addr
;
850 if (resource
->id
!= ACPI_RSTYPE_IO
) {
855 * The first address region returned is the data port, and
856 * the second address region returned is the status/command
859 if (ec
->data_addr
.register_bit_width
== 0) {
860 addr
= &ec
->data_addr
;
861 } else if (ec
->command_addr
.register_bit_width
== 0) {
862 addr
= &ec
->command_addr
;
864 return AE_CTRL_TERMINATE
;
867 addr
->address_space_id
= ACPI_ADR_SPACE_SYSTEM_IO
;
868 addr
->register_bit_width
= 8;
869 addr
->register_bit_offset
= 0;
870 addr
->address
= resource
->data
.io
.min_base_address
;
878 struct acpi_device
*device
)
883 ACPI_FUNCTION_TRACE("acpi_ec_start");
886 return_VALUE(-EINVAL
);
888 ec
= acpi_driver_data(device
);
891 return_VALUE(-EINVAL
);
894 * Get I/O port addresses. Convert to GAS format.
896 status
= acpi_walk_resources(ec
->handle
, METHOD_NAME__CRS
,
897 acpi_ec_io_ports
, ec
);
898 if (ACPI_FAILURE(status
) || ec
->command_addr
.register_bit_width
== 0) {
899 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error getting I/O port addresses"));
900 return_VALUE(-ENODEV
);
903 ec
->status_addr
= ec
->command_addr
;
905 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
906 (u32
) ec
->gpe_bit
, (u32
) ec
->command_addr
.address
,
907 (u32
) ec
->data_addr
.address
));
910 * Install GPE handler
912 status
= acpi_install_gpe_handler(NULL
, ec
->gpe_bit
,
913 ACPI_GPE_EDGE_TRIGGERED
, &acpi_ec_gpe_handler
, ec
);
914 if (ACPI_FAILURE(status
)) {
915 return_VALUE(-ENODEV
);
917 acpi_set_gpe_type (NULL
, ec
->gpe_bit
, ACPI_GPE_TYPE_RUNTIME
);
918 acpi_enable_gpe (NULL
, ec
->gpe_bit
, ACPI_NOT_ISR
);
920 status
= acpi_install_address_space_handler (ec
->handle
,
921 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
,
922 &acpi_ec_space_setup
, ec
);
923 if (ACPI_FAILURE(status
)) {
924 acpi_remove_gpe_handler(NULL
, ec
->gpe_bit
, &acpi_ec_gpe_handler
);
925 return_VALUE(-ENODEV
);
934 struct acpi_device
*device
,
940 ACPI_FUNCTION_TRACE("acpi_ec_stop");
943 return_VALUE(-EINVAL
);
945 ec
= acpi_driver_data(device
);
947 status
= acpi_remove_address_space_handler(ec
->handle
,
948 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
);
949 if (ACPI_FAILURE(status
))
950 return_VALUE(-ENODEV
);
952 status
= acpi_remove_gpe_handler(NULL
, ec
->gpe_bit
, &acpi_ec_gpe_handler
);
953 if (ACPI_FAILURE(status
))
954 return_VALUE(-ENODEV
);
959 static acpi_status __init
960 acpi_fake_ecdt_callback (
968 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
969 acpi_ec_io_ports
, ec_ecdt
);
970 if (ACPI_FAILURE(status
))
972 ec_ecdt
->status_addr
= ec_ecdt
->command_addr
;
975 acpi_evaluate_integer(handle
, "_UID", NULL
, &ec_ecdt
->uid
);
977 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec_ecdt
->gpe_bit
);
978 if (ACPI_FAILURE(status
))
980 ec_ecdt
->global_lock
= TRUE
;
981 ec_ecdt
->handle
= handle
;
983 printk(KERN_INFO PREFIX
"GPE=0x%02x, ports=0x%2x, 0x%2x\n",
984 (u32
) ec_ecdt
->gpe_bit
, (u32
) ec_ecdt
->command_addr
.address
,
985 (u32
) ec_ecdt
->data_addr
.address
);
987 return AE_CTRL_TERMINATE
;
991 * Some BIOS (such as some from Gateway laptops) access EC region very early
992 * such as in BAT0._INI or EC._INI before an EC device is found and
993 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
994 * required, but if EC regison is accessed early, it is required.
995 * The routine tries to workaround the BIOS bug by pre-scan EC device
996 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
997 * op region (since _REG isn't invoked yet). The assumption is true for
1001 acpi_ec_fake_ecdt(void)
1006 printk(KERN_INFO PREFIX
"Try to make an fake ECDT\n");
1008 ec_ecdt
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
1013 memset(ec_ecdt
, 0, sizeof(struct acpi_ec
));
1015 status
= acpi_get_devices (ACPI_EC_HID
,
1016 acpi_fake_ecdt_callback
,
1019 if (ACPI_FAILURE(status
)) {
1027 printk(KERN_ERR PREFIX
"Can't make an fake ECDT\n");
1032 acpi_ec_get_real_ecdt(void)
1035 struct acpi_table_ecdt
*ecdt_ptr
;
1037 status
= acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING
,
1038 (struct acpi_table_header
**) &ecdt_ptr
);
1039 if (ACPI_FAILURE(status
))
1042 printk(KERN_INFO PREFIX
"Found ECDT\n");
1045 * Generate a temporary ec context to use until the namespace is scanned
1047 ec_ecdt
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
1050 memset(ec_ecdt
, 0, sizeof(struct acpi_ec
));
1052 init_MUTEX(&ec_ecdt
->sem
);
1053 init_waitqueue_head(&ec_ecdt
->wait
);
1054 ec_ecdt
->command_addr
= ecdt_ptr
->ec_control
;
1055 ec_ecdt
->status_addr
= ecdt_ptr
->ec_control
;
1056 ec_ecdt
->data_addr
= ecdt_ptr
->ec_data
;
1057 ec_ecdt
->gpe_bit
= ecdt_ptr
->gpe_bit
;
1058 /* use the GL just to be safe */
1059 ec_ecdt
->global_lock
= TRUE
;
1060 ec_ecdt
->uid
= ecdt_ptr
->uid
;
1062 status
= acpi_get_handle(NULL
, ecdt_ptr
->ec_id
, &ec_ecdt
->handle
);
1063 if (ACPI_FAILURE(status
)) {
1069 printk(KERN_ERR PREFIX
"Could not use ECDT\n");
1076 static int __initdata acpi_fake_ecdt_enabled
;
1078 acpi_ec_ecdt_probe (void)
1083 ret
= acpi_ec_get_real_ecdt();
1084 /* Try to make a fake ECDT */
1085 if (ret
&& acpi_fake_ecdt_enabled
) {
1086 ret
= acpi_ec_fake_ecdt();
1093 * Install GPE handler
1095 status
= acpi_install_gpe_handler(NULL
, ec_ecdt
->gpe_bit
,
1096 ACPI_GPE_EDGE_TRIGGERED
, &acpi_ec_gpe_handler
,
1098 if (ACPI_FAILURE(status
)) {
1101 acpi_set_gpe_type (NULL
, ec_ecdt
->gpe_bit
, ACPI_GPE_TYPE_RUNTIME
);
1102 acpi_enable_gpe (NULL
, ec_ecdt
->gpe_bit
, ACPI_NOT_ISR
);
1104 status
= acpi_install_address_space_handler (ACPI_ROOT_OBJECT
,
1105 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
,
1106 &acpi_ec_space_setup
, ec_ecdt
);
1107 if (ACPI_FAILURE(status
)) {
1108 acpi_remove_gpe_handler(NULL
, ec_ecdt
->gpe_bit
,
1109 &acpi_ec_gpe_handler
);
1116 printk(KERN_ERR PREFIX
"Could not use ECDT\n");
1124 static int __init
acpi_ec_init (void)
1128 ACPI_FUNCTION_TRACE("acpi_ec_init");
1133 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
1135 return_VALUE(-ENODEV
);
1137 /* Now register the driver for the EC */
1138 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1140 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1141 return_VALUE(-ENODEV
);
1144 return_VALUE(result
);
1147 subsys_initcall(acpi_ec_init
);
1149 /* EC driver currently not unloadable */
1154 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1156 acpi_bus_unregister_driver(&acpi_ec_driver
);
1158 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1164 static int __init
acpi_fake_ecdt_setup(char *str
)
1166 acpi_fake_ecdt_enabled
= 1;
1169 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup
);