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_INTR
= 1, /* Output buffer full */
76 EC_POLL
, /* Input buffer empty */
77 } acpi_ec_mode
= EC_INTR
;
79 static int acpi_ec_remove(struct acpi_device
*device
, int type
);
80 static int acpi_ec_start(struct acpi_device
*device
);
81 static int acpi_ec_stop(struct acpi_device
*device
, int type
);
82 static int acpi_ec_add(struct acpi_device
*device
);
84 static const struct acpi_device_id ec_device_ids
[] = {
89 static struct acpi_driver acpi_ec_driver
= {
91 .class = ACPI_EC_CLASS
,
95 .remove
= acpi_ec_remove
,
96 .start
= acpi_ec_start
,
101 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
102 /* External interfaces use first EC only, so remember */
103 typedef int (*acpi_ec_query_func
) (void *data
);
105 struct acpi_ec_query_handler
{
106 struct list_head node
;
107 acpi_ec_query_func func
;
113 static struct acpi_ec
{
116 unsigned long command_addr
;
117 unsigned long data_addr
;
118 unsigned long global_lock
;
120 atomic_t query_pending
;
121 atomic_t event_count
;
122 wait_queue_head_t wait
;
123 struct list_head list
;
124 } *boot_ec
, *first_ec
;
126 /* --------------------------------------------------------------------------
127 Transaction Management
128 -------------------------------------------------------------------------- */
130 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
132 return inb(ec
->command_addr
);
135 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
137 return inb(ec
->data_addr
);
140 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
142 outb(command
, ec
->command_addr
);
145 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
147 outb(data
, ec
->data_addr
);
150 static inline int acpi_ec_check_status(struct acpi_ec
*ec
, enum ec_event event
,
153 u8 status
= acpi_ec_read_status(ec
);
154 if (old_count
== atomic_read(&ec
->event_count
))
156 if (event
== ACPI_EC_EVENT_OBF_1
) {
157 if (status
& ACPI_EC_FLAG_OBF
)
159 } else if (event
== ACPI_EC_EVENT_IBF_0
) {
160 if (!(status
& ACPI_EC_FLAG_IBF
))
167 static int acpi_ec_wait(struct acpi_ec
*ec
, enum ec_event event
,
168 unsigned count
, int force_poll
)
170 if (unlikely(force_poll
) || acpi_ec_mode
== EC_POLL
) {
171 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
172 while (time_before(jiffies
, delay
)) {
173 if (acpi_ec_check_status(ec
, event
, 0))
177 if (wait_event_timeout(ec
->wait
,
178 acpi_ec_check_status(ec
, event
, count
),
179 msecs_to_jiffies(ACPI_EC_DELAY
)) ||
180 acpi_ec_check_status(ec
, event
, 0)) {
183 printk(KERN_ERR PREFIX
"acpi_ec_wait timeout,"
184 " status = %d, expect_event = %d\n",
185 acpi_ec_read_status(ec
), event
);
192 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
193 const u8
* wdata
, unsigned wdata_len
,
194 u8
* rdata
, unsigned rdata_len
,
198 unsigned count
= atomic_read(&ec
->event_count
);
199 acpi_ec_write_cmd(ec
, command
);
201 for (; wdata_len
> 0; --wdata_len
) {
202 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, count
, force_poll
);
204 printk(KERN_ERR PREFIX
205 "write_cmd timeout, command = %d\n", command
);
208 count
= atomic_read(&ec
->event_count
);
209 acpi_ec_write_data(ec
, *(wdata
++));
213 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, count
, force_poll
);
215 printk(KERN_ERR PREFIX
216 "finish-write timeout, command = %d\n", command
);
219 } else if (command
== ACPI_EC_COMMAND_QUERY
) {
220 atomic_set(&ec
->query_pending
, 0);
223 for (; rdata_len
> 0; --rdata_len
) {
224 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
, count
, force_poll
);
226 printk(KERN_ERR PREFIX
"read timeout, command = %d\n",
230 count
= atomic_read(&ec
->event_count
);
231 *(rdata
++) = acpi_ec_read_data(ec
);
237 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
238 const u8
* wdata
, unsigned wdata_len
,
239 u8
* rdata
, unsigned rdata_len
,
245 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
249 memset(rdata
, 0, rdata_len
);
251 mutex_lock(&ec
->lock
);
252 if (ec
->global_lock
) {
253 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
254 if (ACPI_FAILURE(status
)) {
255 mutex_unlock(&ec
->lock
);
260 /* Make sure GPE is enabled before doing transaction */
261 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
263 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, 0, 0);
265 printk(KERN_ERR PREFIX
266 "input buffer is not empty, aborting transaction\n");
270 status
= acpi_ec_transaction_unlocked(ec
, command
,
278 acpi_release_global_lock(glk
);
279 mutex_unlock(&ec
->lock
);
285 * Note: samsung nv5000 doesn't work with ec burst mode.
286 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
288 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
291 return acpi_ec_transaction(ec
, ACPI_EC_BURST_ENABLE
, NULL
, 0, &d
, 1, 0);
294 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
296 return acpi_ec_transaction(ec
, ACPI_EC_BURST_DISABLE
, NULL
, 0, NULL
, 0, 0);
299 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
304 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
305 &address
, 1, &d
, 1, 0);
310 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
312 u8 wdata
[2] = { address
, data
};
313 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
314 wdata
, 2, NULL
, 0, 0);
318 * Externally callable EC access functions. For now, assume 1 EC only
320 int ec_burst_enable(void)
324 return acpi_ec_burst_enable(first_ec
);
327 EXPORT_SYMBOL(ec_burst_enable
);
329 int ec_burst_disable(void)
333 return acpi_ec_burst_disable(first_ec
);
336 EXPORT_SYMBOL(ec_burst_disable
);
338 int ec_read(u8 addr
, u8
* val
)
346 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
355 EXPORT_SYMBOL(ec_read
);
357 int ec_write(u8 addr
, u8 val
)
364 err
= acpi_ec_write(first_ec
, addr
, val
);
369 EXPORT_SYMBOL(ec_write
);
371 int ec_transaction(u8 command
,
372 const u8
* wdata
, unsigned wdata_len
,
373 u8
* rdata
, unsigned rdata_len
,
379 return acpi_ec_transaction(first_ec
, command
, wdata
,
380 wdata_len
, rdata
, rdata_len
,
384 EXPORT_SYMBOL(ec_transaction
);
386 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
395 * Query the EC to find out which _Qxx method we need to evaluate.
396 * Note that successful completion of the query causes the ACPI_EC_SCI
397 * bit to be cleared (and thus clearing the interrupt source).
400 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1, 0);
411 /* --------------------------------------------------------------------------
413 -------------------------------------------------------------------------- */
414 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
415 acpi_handle handle
, acpi_ec_query_func func
,
418 struct acpi_ec_query_handler
*handler
=
419 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
423 handler
->query_bit
= query_bit
;
424 handler
->handle
= handle
;
425 handler
->func
= func
;
426 handler
->data
= data
;
427 mutex_lock(&ec
->lock
);
428 list_add_tail(&handler
->node
, &ec
->list
);
429 mutex_unlock(&ec
->lock
);
433 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
435 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
437 struct acpi_ec_query_handler
*handler
;
438 mutex_lock(&ec
->lock
);
439 list_for_each_entry(handler
, &ec
->list
, node
) {
440 if (query_bit
== handler
->query_bit
) {
441 list_del(&handler
->node
);
446 mutex_unlock(&ec
->lock
);
449 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
451 static void acpi_ec_gpe_query(void *ec_cxt
)
453 struct acpi_ec
*ec
= ec_cxt
;
455 struct acpi_ec_query_handler
*handler
, copy
;
457 if (!ec
|| acpi_ec_query(ec
, &value
))
459 mutex_lock(&ec
->lock
);
460 list_for_each_entry(handler
, &ec
->list
, node
) {
461 if (value
== handler
->query_bit
) {
462 /* have custom handler for this bit */
463 memcpy(©
, handler
, sizeof(copy
));
464 mutex_unlock(&ec
->lock
);
466 copy
.func(copy
.data
);
467 } else if (copy
.handle
) {
468 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
473 mutex_unlock(&ec
->lock
);
476 static u32
acpi_ec_gpe_handler(void *data
)
478 acpi_status status
= AE_OK
;
480 struct acpi_ec
*ec
= data
;
482 atomic_inc(&ec
->event_count
);
484 if (acpi_ec_mode
== EC_INTR
) {
488 value
= acpi_ec_read_status(ec
);
489 if ((value
& ACPI_EC_FLAG_SCI
) && !atomic_read(&ec
->query_pending
)) {
490 atomic_set(&ec
->query_pending
, 1);
492 acpi_os_execute(OSL_EC_BURST_HANDLER
, acpi_ec_gpe_query
, ec
);
495 return status
== AE_OK
?
496 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
499 /* --------------------------------------------------------------------------
500 Address Space Management
501 -------------------------------------------------------------------------- */
504 acpi_ec_space_setup(acpi_handle region_handle
,
505 u32 function
, void *handler_context
, void **return_context
)
508 * The EC object is in the handler context and is needed
509 * when calling the acpi_ec_space_handler.
511 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
512 handler_context
: NULL
;
518 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
519 u32 bits
, acpi_integer
*value
,
520 void *handler_context
, void *region_context
)
522 struct acpi_ec
*ec
= handler_context
;
523 int result
= 0, i
= 0;
526 if ((address
> 0xFF) || !value
|| !handler_context
)
527 return AE_BAD_PARAMETER
;
529 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
530 return AE_BAD_PARAMETER
;
532 if (bits
!= 8 && acpi_strict
)
533 return AE_BAD_PARAMETER
;
535 while (bits
- i
> 0) {
536 if (function
== ACPI_READ
) {
537 result
= acpi_ec_read(ec
, address
, &temp
);
538 (*value
) |= ((acpi_integer
)temp
) << i
;
540 temp
= 0xff & ((*value
) >> i
);
541 result
= acpi_ec_write(ec
, address
, temp
);
549 return AE_BAD_PARAMETER
;
562 /* --------------------------------------------------------------------------
564 -------------------------------------------------------------------------- */
566 static struct proc_dir_entry
*acpi_ec_dir
;
568 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
570 struct acpi_ec
*ec
= seq
->private;
575 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
576 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
577 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
578 seq_printf(seq
, "use global lock:\t%s\n",
579 ec
->global_lock
? "yes" : "no");
584 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
586 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
589 static struct file_operations acpi_ec_info_ops
= {
590 .open
= acpi_ec_info_open_fs
,
593 .release
= single_release
,
594 .owner
= THIS_MODULE
,
597 static int acpi_ec_add_fs(struct acpi_device
*device
)
599 struct proc_dir_entry
*entry
= NULL
;
601 if (!acpi_device_dir(device
)) {
602 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
604 if (!acpi_device_dir(device
))
608 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
609 acpi_device_dir(device
));
613 entry
->proc_fops
= &acpi_ec_info_ops
;
614 entry
->data
= acpi_driver_data(device
);
615 entry
->owner
= THIS_MODULE
;
621 static int acpi_ec_remove_fs(struct acpi_device
*device
)
624 if (acpi_device_dir(device
)) {
625 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
626 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
627 acpi_device_dir(device
) = NULL
;
633 /* --------------------------------------------------------------------------
635 -------------------------------------------------------------------------- */
637 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
639 static struct acpi_ec
*make_acpi_ec(void)
641 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
645 atomic_set(&ec
->query_pending
, 1);
646 atomic_set(&ec
->event_count
, 1);
647 mutex_init(&ec
->lock
);
648 init_waitqueue_head(&ec
->wait
);
649 INIT_LIST_HEAD(&ec
->list
);
655 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
656 void *context
, void **return_value
)
658 struct acpi_namespace_node
*node
= handle
;
659 struct acpi_ec
*ec
= context
;
661 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
662 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
668 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
672 struct acpi_ec
*ec
= context
;
673 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
674 ec_parse_io_ports
, ec
);
675 if (ACPI_FAILURE(status
))
678 /* Get GPE bit assignment (EC events). */
679 /* TODO: Add support for _GPE returning a package */
680 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
);
681 if (ACPI_FAILURE(status
))
684 /* Find and register all query methods */
685 acpi_walk_namespace(ACPI_TYPE_METHOD
, handle
, 1,
686 acpi_ec_register_query_methods
, ec
, NULL
);
688 /* Use the global lock for all EC transactions? */
689 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
693 printk(KERN_INFO PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
694 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
696 return AE_CTRL_TERMINATE
;
699 static int acpi_ec_add(struct acpi_device
*device
)
701 struct acpi_ec
*ec
= NULL
;
706 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
707 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
713 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
719 /* Check if we found the boot EC */
721 if (boot_ec
->gpe
== ec
->gpe
) {
722 /* We might have incorrect info for GL at boot time */
723 mutex_lock(&boot_ec
->lock
);
724 boot_ec
->global_lock
= ec
->global_lock
;
725 /* Copy handlers from new ec into boot ec */
726 list_splice(&ec
->list
, &boot_ec
->list
);
727 mutex_unlock(&boot_ec
->lock
);
733 ec
->handle
= device
->handle
;
734 acpi_driver_data(device
) = ec
;
736 acpi_ec_add_fs(device
);
740 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
743 struct acpi_ec_query_handler
*handler
, *tmp
;
748 ec
= acpi_driver_data(device
);
749 mutex_lock(&ec
->lock
);
750 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
751 list_del(&handler
->node
);
754 mutex_unlock(&ec
->lock
);
755 acpi_ec_remove_fs(device
);
756 acpi_driver_data(device
) = NULL
;
760 /* Don't touch boot EC */
767 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
769 struct acpi_ec
*ec
= context
;
771 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
775 * The first address region returned is the data port, and
776 * the second address region returned is the status/command
779 if (ec
->data_addr
== 0)
780 ec
->data_addr
= resource
->data
.io
.minimum
;
781 else if (ec
->command_addr
== 0)
782 ec
->command_addr
= resource
->data
.io
.minimum
;
784 return AE_CTRL_TERMINATE
;
789 static int ec_install_handlers(struct acpi_ec
*ec
)
792 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
793 ACPI_GPE_EDGE_TRIGGERED
,
794 &acpi_ec_gpe_handler
, ec
);
795 if (ACPI_FAILURE(status
))
798 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
799 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
801 status
= acpi_install_address_space_handler(ec
->handle
,
803 &acpi_ec_space_handler
,
804 &acpi_ec_space_setup
, ec
);
805 if (ACPI_FAILURE(status
)) {
806 acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
813 static int acpi_ec_start(struct acpi_device
*device
)
821 ec
= acpi_driver_data(device
);
826 /* Boot EC is already working */
828 ret
= ec_install_handlers(ec
);
830 /* EC is fully operational, allow queries */
831 atomic_set(&ec
->query_pending
, 0);
836 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
844 ec
= acpi_driver_data(device
);
848 /* Don't touch boot EC */
852 status
= acpi_remove_address_space_handler(ec
->handle
,
854 &acpi_ec_space_handler
);
855 if (ACPI_FAILURE(status
))
858 status
= acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
859 if (ACPI_FAILURE(status
))
865 int __init
acpi_ec_ecdt_probe(void)
869 struct acpi_table_ecdt
*ecdt_ptr
;
871 boot_ec
= make_acpi_ec();
875 * Generate a boot ec context
877 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
878 (struct acpi_table_header
**)&ecdt_ptr
);
879 if (ACPI_SUCCESS(status
)) {
880 printk(KERN_INFO PREFIX
"EC description table is found, configuring boot EC\n\n");
881 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
882 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
883 boot_ec
->gpe
= ecdt_ptr
->gpe
;
884 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
886 printk(KERN_DEBUG PREFIX
"Look up EC in DSDT\n");
887 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
889 if (ACPI_FAILURE(status
))
893 ret
= ec_install_handlers(boot_ec
);
905 static int __init
acpi_ec_init(void)
912 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
916 /* Now register the driver for the EC */
917 result
= acpi_bus_register_driver(&acpi_ec_driver
);
919 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
926 subsys_initcall(acpi_ec_init
);
928 /* EC driver currently not unloadable */
930 static void __exit
acpi_ec_exit(void)
933 acpi_bus_unregister_driver(&acpi_ec_driver
);
935 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
941 static int __init
acpi_ec_set_intr_mode(char *str
)
945 if (!get_option(&str
, &intr
))
948 acpi_ec_mode
= (intr
) ? EC_INTR
: EC_POLL
;
950 printk(KERN_NOTICE PREFIX
"%s mode.\n", intr
? "interrupt" : "polling");
955 __setup("ec_intr=", acpi_ec_set_intr_mode
);