2 * ec.c - ACPI Embedded Controller Driver (v2.0)
4 * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
6 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/delay.h>
34 #include <linux/proc_fs.h>
35 #include <linux/seq_file.h>
36 #include <linux/interrupt.h>
37 #include <linux/list.h>
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <acpi/actypes.h>
43 #define ACPI_EC_CLASS "embedded_controller"
44 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
45 #define ACPI_EC_FILE_INFO "info"
48 #define PREFIX "ACPI: EC: "
50 /* EC status register */
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 */
58 ACPI_EC_COMMAND_READ
= 0x80,
59 ACPI_EC_COMMAND_WRITE
= 0x81,
60 ACPI_EC_BURST_ENABLE
= 0x82,
61 ACPI_EC_BURST_DISABLE
= 0x83,
62 ACPI_EC_COMMAND_QUERY
= 0x84,
67 ACPI_EC_EVENT_OBF_1
= 1, /* Output buffer full */
68 ACPI_EC_EVENT_IBF_0
, /* Input buffer empty */
71 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
72 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
75 EC_FLAGS_WAIT_GPE
= 0, /* Don't check status until GPE arrives */
76 EC_FLAGS_QUERY_PENDING
, /* Query is pending */
77 EC_FLAGS_GPE_MODE
, /* Expect GPE to be sent for status change */
78 EC_FLAGS_ONLY_IBF_GPE
, /* Expect GPE only for IBF = 0 event */
81 static int acpi_ec_remove(struct acpi_device
*device
, int type
);
82 static int acpi_ec_start(struct acpi_device
*device
);
83 static int acpi_ec_stop(struct acpi_device
*device
, int type
);
84 static int acpi_ec_add(struct acpi_device
*device
);
86 static const struct acpi_device_id ec_device_ids
[] = {
91 static struct acpi_driver acpi_ec_driver
= {
93 .class = ACPI_EC_CLASS
,
97 .remove
= acpi_ec_remove
,
98 .start
= acpi_ec_start
,
103 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
104 /* External interfaces use first EC only, so remember */
105 typedef int (*acpi_ec_query_func
) (void *data
);
107 struct acpi_ec_query_handler
{
108 struct list_head node
;
109 acpi_ec_query_func func
;
115 static struct acpi_ec
{
118 unsigned long command_addr
;
119 unsigned long data_addr
;
120 unsigned long global_lock
;
123 wait_queue_head_t wait
;
124 struct list_head list
;
125 u8 handlers_installed
;
126 } *boot_ec
, *first_ec
;
128 /* --------------------------------------------------------------------------
129 Transaction Management
130 -------------------------------------------------------------------------- */
132 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
134 return inb(ec
->command_addr
);
137 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
139 return inb(ec
->data_addr
);
142 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
144 outb(command
, ec
->command_addr
);
147 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
149 outb(data
, ec
->data_addr
);
152 static inline int acpi_ec_check_status(struct acpi_ec
*ec
, enum ec_event event
)
154 if (test_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
))
156 if (event
== ACPI_EC_EVENT_OBF_1
) {
157 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_OBF
)
159 } else if (event
== ACPI_EC_EVENT_IBF_0
) {
160 if (!(acpi_ec_read_status(ec
) & ACPI_EC_FLAG_IBF
))
167 static int acpi_ec_wait(struct acpi_ec
*ec
, enum ec_event event
, int force_poll
)
169 if (likely(test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
)) &&
170 likely(!force_poll
)) {
171 if (wait_event_timeout(ec
->wait
, acpi_ec_check_status(ec
, event
),
172 msecs_to_jiffies(ACPI_EC_DELAY
)))
174 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
175 if (acpi_ec_check_status(ec
, event
)) {
176 if (event
== ACPI_EC_EVENT_OBF_1
) {
177 /* miss OBF = 1 GPE, don't expect it anymore */
178 printk(KERN_INFO PREFIX
"missing OBF_1 confirmation,"
179 "switching to degraded mode.\n");
180 set_bit(EC_FLAGS_ONLY_IBF_GPE
, &ec
->flags
);
182 /* missing GPEs, switch back to poll mode */
183 printk(KERN_INFO PREFIX
"missing IBF_1 confirmations,"
184 "switch off interrupt mode.\n");
185 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
190 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
191 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
192 while (time_before(jiffies
, delay
)) {
193 if (acpi_ec_check_status(ec
, event
))
197 printk(KERN_ERR PREFIX
"acpi_ec_wait timeout,"
198 " status = %d, expect_event = %d\n",
199 acpi_ec_read_status(ec
), event
);
203 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
204 const u8
* wdata
, unsigned wdata_len
,
205 u8
* rdata
, unsigned rdata_len
,
209 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
210 acpi_ec_write_cmd(ec
, command
);
212 for (; wdata_len
> 0; --wdata_len
) {
213 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, force_poll
);
215 printk(KERN_ERR PREFIX
216 "write_cmd timeout, command = %d\n", command
);
219 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
220 acpi_ec_write_data(ec
, *(wdata
++));
224 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, force_poll
);
226 printk(KERN_ERR PREFIX
227 "finish-write timeout, command = %d\n", command
);
230 } else if (command
== ACPI_EC_COMMAND_QUERY
)
231 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
233 for (; rdata_len
> 0; --rdata_len
) {
234 if (test_bit(EC_FLAGS_ONLY_IBF_GPE
, &ec
->flags
))
236 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
, force_poll
);
238 printk(KERN_ERR PREFIX
"read timeout, command = %d\n",
242 /* Don't expect GPE after last read */
244 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
245 *(rdata
++) = acpi_ec_read_data(ec
);
251 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
252 const u8
* wdata
, unsigned wdata_len
,
253 u8
* rdata
, unsigned rdata_len
,
259 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
263 memset(rdata
, 0, rdata_len
);
265 mutex_lock(&ec
->lock
);
266 if (ec
->global_lock
) {
267 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
268 if (ACPI_FAILURE(status
)) {
269 mutex_unlock(&ec
->lock
);
274 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, 0);
276 printk(KERN_ERR PREFIX
277 "input buffer is not empty, aborting transaction\n");
281 status
= acpi_ec_transaction_unlocked(ec
, command
,
289 acpi_release_global_lock(glk
);
290 mutex_unlock(&ec
->lock
);
296 * Note: samsung nv5000 doesn't work with ec burst mode.
297 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
299 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
302 return acpi_ec_transaction(ec
, ACPI_EC_BURST_ENABLE
, NULL
, 0, &d
, 1, 0);
305 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
307 return acpi_ec_transaction(ec
, ACPI_EC_BURST_DISABLE
, NULL
, 0, NULL
, 0, 0);
310 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
315 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
316 &address
, 1, &d
, 1, 0);
321 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
323 u8 wdata
[2] = { address
, data
};
324 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
325 wdata
, 2, NULL
, 0, 0);
329 * Externally callable EC access functions. For now, assume 1 EC only
331 int ec_burst_enable(void)
335 return acpi_ec_burst_enable(first_ec
);
338 EXPORT_SYMBOL(ec_burst_enable
);
340 int ec_burst_disable(void)
344 return acpi_ec_burst_disable(first_ec
);
347 EXPORT_SYMBOL(ec_burst_disable
);
349 int ec_read(u8 addr
, u8
* val
)
357 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
366 EXPORT_SYMBOL(ec_read
);
368 int ec_write(u8 addr
, u8 val
)
375 err
= acpi_ec_write(first_ec
, addr
, val
);
380 EXPORT_SYMBOL(ec_write
);
382 int ec_transaction(u8 command
,
383 const u8
* wdata
, unsigned wdata_len
,
384 u8
* rdata
, unsigned rdata_len
,
390 return acpi_ec_transaction(first_ec
, command
, wdata
,
391 wdata_len
, rdata
, rdata_len
,
395 EXPORT_SYMBOL(ec_transaction
);
397 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
406 * Query the EC to find out which _Qxx method we need to evaluate.
407 * Note that successful completion of the query causes the ACPI_EC_SCI
408 * bit to be cleared (and thus clearing the interrupt source).
411 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1, 0);
422 /* --------------------------------------------------------------------------
424 -------------------------------------------------------------------------- */
425 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
426 acpi_handle handle
, acpi_ec_query_func func
,
429 struct acpi_ec_query_handler
*handler
=
430 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
434 handler
->query_bit
= query_bit
;
435 handler
->handle
= handle
;
436 handler
->func
= func
;
437 handler
->data
= data
;
438 mutex_lock(&ec
->lock
);
439 list_add(&handler
->node
, &ec
->list
);
440 mutex_unlock(&ec
->lock
);
444 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
446 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
448 struct acpi_ec_query_handler
*handler
, *tmp
;
449 mutex_lock(&ec
->lock
);
450 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
451 if (query_bit
== handler
->query_bit
) {
452 list_del(&handler
->node
);
456 mutex_unlock(&ec
->lock
);
459 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
461 static void acpi_ec_gpe_query(void *ec_cxt
)
463 struct acpi_ec
*ec
= ec_cxt
;
465 struct acpi_ec_query_handler
*handler
, copy
;
467 if (!ec
|| acpi_ec_query(ec
, &value
))
469 mutex_lock(&ec
->lock
);
470 list_for_each_entry(handler
, &ec
->list
, node
) {
471 if (value
== handler
->query_bit
) {
472 /* have custom handler for this bit */
473 memcpy(©
, handler
, sizeof(copy
));
474 mutex_unlock(&ec
->lock
);
476 copy
.func(copy
.data
);
477 } else if (copy
.handle
) {
478 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
483 mutex_unlock(&ec
->lock
);
486 static u32
acpi_ec_gpe_handler(void *data
)
488 acpi_status status
= AE_OK
;
489 struct acpi_ec
*ec
= data
;
491 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
492 if (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))
495 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_SCI
) {
496 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
497 status
= acpi_os_execute(OSL_EC_BURST_HANDLER
,
498 acpi_ec_gpe_query
, ec
);
499 } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))) {
500 /* this is non-query, must be confirmation */
501 printk(KERN_INFO PREFIX
"non-query interrupt received,"
502 " switching to interrupt mode\n");
503 set_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
506 return ACPI_SUCCESS(status
) ?
507 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
510 /* --------------------------------------------------------------------------
511 Address Space Management
512 -------------------------------------------------------------------------- */
515 acpi_ec_space_setup(acpi_handle region_handle
,
516 u32 function
, void *handler_context
, void **return_context
)
519 * The EC object is in the handler context and is needed
520 * when calling the acpi_ec_space_handler.
522 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
523 handler_context
: NULL
;
529 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
530 u32 bits
, acpi_integer
*value
,
531 void *handler_context
, void *region_context
)
533 struct acpi_ec
*ec
= handler_context
;
534 int result
= 0, i
= 0;
537 if ((address
> 0xFF) || !value
|| !handler_context
)
538 return AE_BAD_PARAMETER
;
540 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
541 return AE_BAD_PARAMETER
;
543 if (bits
!= 8 && acpi_strict
)
544 return AE_BAD_PARAMETER
;
546 while (bits
- i
> 0) {
547 if (function
== ACPI_READ
) {
548 result
= acpi_ec_read(ec
, address
, &temp
);
549 (*value
) |= ((acpi_integer
)temp
) << i
;
551 temp
= 0xff & ((*value
) >> i
);
552 result
= acpi_ec_write(ec
, address
, temp
);
560 return AE_BAD_PARAMETER
;
573 /* --------------------------------------------------------------------------
575 -------------------------------------------------------------------------- */
577 static struct proc_dir_entry
*acpi_ec_dir
;
579 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
581 struct acpi_ec
*ec
= seq
->private;
586 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
587 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
588 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
589 seq_printf(seq
, "use global lock:\t%s\n",
590 ec
->global_lock
? "yes" : "no");
595 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
597 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
600 static struct file_operations acpi_ec_info_ops
= {
601 .open
= acpi_ec_info_open_fs
,
604 .release
= single_release
,
605 .owner
= THIS_MODULE
,
608 static int acpi_ec_add_fs(struct acpi_device
*device
)
610 struct proc_dir_entry
*entry
= NULL
;
612 if (!acpi_device_dir(device
)) {
613 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
615 if (!acpi_device_dir(device
))
619 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
620 acpi_device_dir(device
));
624 entry
->proc_fops
= &acpi_ec_info_ops
;
625 entry
->data
= acpi_driver_data(device
);
626 entry
->owner
= THIS_MODULE
;
632 static int acpi_ec_remove_fs(struct acpi_device
*device
)
635 if (acpi_device_dir(device
)) {
636 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
637 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
638 acpi_device_dir(device
) = NULL
;
644 /* --------------------------------------------------------------------------
646 -------------------------------------------------------------------------- */
648 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
650 static struct acpi_ec
*make_acpi_ec(void)
652 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
655 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
656 mutex_init(&ec
->lock
);
657 init_waitqueue_head(&ec
->wait
);
658 INIT_LIST_HEAD(&ec
->list
);
663 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
664 void *context
, void **return_value
)
666 struct acpi_namespace_node
*node
= handle
;
667 struct acpi_ec
*ec
= context
;
669 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
670 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
676 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
680 struct acpi_ec
*ec
= context
;
681 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
682 ec_parse_io_ports
, ec
);
683 if (ACPI_FAILURE(status
))
686 /* Get GPE bit assignment (EC events). */
687 /* TODO: Add support for _GPE returning a package */
688 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
);
689 if (ACPI_FAILURE(status
))
691 /* Find and register all query methods */
692 acpi_walk_namespace(ACPI_TYPE_METHOD
, handle
, 1,
693 acpi_ec_register_query_methods
, ec
, NULL
);
694 /* Use the global lock for all EC transactions? */
695 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
697 return AE_CTRL_TERMINATE
;
700 static void ec_remove_handlers(struct acpi_ec
*ec
)
702 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
703 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
704 printk(KERN_ERR PREFIX
"failed to remove space handler\n");
705 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
706 &acpi_ec_gpe_handler
)))
707 printk(KERN_ERR PREFIX
"failed to remove gpe handler\n");
708 ec
->handlers_installed
= 0;
711 static int acpi_ec_add(struct acpi_device
*device
)
713 struct acpi_ec
*ec
= NULL
;
717 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
718 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
720 /* Check for boot EC */
722 if (boot_ec
->handle
== device
->handle
) {
723 /* Pre-loaded EC from DSDT, just move pointer */
727 } else if (boot_ec
->handle
== ACPI_ROOT_OBJECT
) {
728 /* ECDT-based EC, time to shut it down */
729 ec_remove_handlers(boot_ec
);
731 first_ec
= boot_ec
= NULL
;
739 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
744 ec
->handle
= device
->handle
;
748 acpi_driver_data(device
) = ec
;
749 acpi_ec_add_fs(device
);
750 printk(KERN_INFO PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
751 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
752 printk(KERN_INFO PREFIX
"driver started in %s mode\n",
753 (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))?"interrupt":"poll");
757 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
760 struct acpi_ec_query_handler
*handler
, *tmp
;
765 ec
= acpi_driver_data(device
);
766 mutex_lock(&ec
->lock
);
767 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
768 list_del(&handler
->node
);
771 mutex_unlock(&ec
->lock
);
772 acpi_ec_remove_fs(device
);
773 acpi_driver_data(device
) = NULL
;
781 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
783 struct acpi_ec
*ec
= context
;
785 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
789 * The first address region returned is the data port, and
790 * the second address region returned is the status/command
793 if (ec
->data_addr
== 0)
794 ec
->data_addr
= resource
->data
.io
.minimum
;
795 else if (ec
->command_addr
== 0)
796 ec
->command_addr
= resource
->data
.io
.minimum
;
798 return AE_CTRL_TERMINATE
;
803 static int ec_install_handlers(struct acpi_ec
*ec
)
806 if (ec
->handlers_installed
)
808 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
809 ACPI_GPE_EDGE_TRIGGERED
,
810 &acpi_ec_gpe_handler
, ec
);
811 if (ACPI_FAILURE(status
))
814 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
815 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
817 status
= acpi_install_address_space_handler(ec
->handle
,
819 &acpi_ec_space_handler
,
820 &acpi_ec_space_setup
, ec
);
821 if (ACPI_FAILURE(status
)) {
822 acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
826 ec
->handlers_installed
= 1;
830 static int acpi_ec_start(struct acpi_device
*device
)
838 ec
= acpi_driver_data(device
);
843 ret
= ec_install_handlers(ec
);
845 /* EC is fully operational, allow queries */
846 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
850 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
855 ec
= acpi_driver_data(device
);
858 ec_remove_handlers(ec
);
863 int __init
acpi_ec_ecdt_probe(void)
867 struct acpi_table_ecdt
*ecdt_ptr
;
869 boot_ec
= make_acpi_ec();
873 * Generate a boot ec context
875 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
876 (struct acpi_table_header
**)&ecdt_ptr
);
877 if (ACPI_SUCCESS(status
)) {
878 printk(KERN_INFO PREFIX
"EC description table is found, configuring boot EC\n");
879 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
880 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
881 boot_ec
->gpe
= ecdt_ptr
->gpe
;
882 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
884 printk(KERN_DEBUG PREFIX
"Look up EC in DSDT\n");
885 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
887 /* Check that acpi_get_devices actually find something */
888 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
892 ret
= ec_install_handlers(boot_ec
);
903 static int __init
acpi_ec_init(void)
910 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
914 /* Now register the driver for the EC */
915 result
= acpi_bus_register_driver(&acpi_ec_driver
);
917 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
924 subsys_initcall(acpi_ec_init
);
926 /* EC driver currently not unloadable */
928 static void __exit
acpi_ec_exit(void)
931 acpi_bus_unregister_driver(&acpi_ec_driver
);
933 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);