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_HID "PNP0C09"
45 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
46 #define ACPI_EC_FILE_INFO "info"
49 #define PREFIX "ACPI: EC: "
51 /* EC status register */
52 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
53 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
54 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
55 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
59 ACPI_EC_COMMAND_READ
= 0x80,
60 ACPI_EC_COMMAND_WRITE
= 0x81,
61 ACPI_EC_BURST_ENABLE
= 0x82,
62 ACPI_EC_BURST_DISABLE
= 0x83,
63 ACPI_EC_COMMAND_QUERY
= 0x84,
68 ACPI_EC_EVENT_OBF_1
= 1, /* Output buffer full */
69 ACPI_EC_EVENT_IBF_0
, /* Input buffer empty */
72 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
73 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
76 EC_INTR
= 1, /* Output buffer full */
77 EC_POLL
, /* Input buffer empty */
78 } acpi_ec_mode
= EC_INTR
;
80 static int acpi_ec_remove(struct acpi_device
*device
, int type
);
81 static int acpi_ec_start(struct acpi_device
*device
);
82 static int acpi_ec_stop(struct acpi_device
*device
, int type
);
83 static int acpi_ec_add(struct acpi_device
*device
);
85 static struct acpi_driver acpi_ec_driver
= {
87 .class = ACPI_EC_CLASS
,
91 .remove
= acpi_ec_remove
,
92 .start
= acpi_ec_start
,
97 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
98 /* External interfaces use first EC only, so remember */
99 typedef int (*acpi_ec_query_func
) (void *data
);
101 struct acpi_ec_query_handler
{
102 struct list_head node
;
103 acpi_ec_query_func func
;
109 static struct acpi_ec
{
112 unsigned long command_addr
;
113 unsigned long data_addr
;
114 unsigned long global_lock
;
116 atomic_t query_pending
;
117 atomic_t event_count
;
118 wait_queue_head_t wait
;
119 struct list_head list
;
120 } *boot_ec
, *first_ec
;
122 /* --------------------------------------------------------------------------
123 Transaction Management
124 -------------------------------------------------------------------------- */
126 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
128 return inb(ec
->command_addr
);
131 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
133 return inb(ec
->data_addr
);
136 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
138 outb(command
, ec
->command_addr
);
141 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
143 outb(data
, ec
->data_addr
);
146 static inline int acpi_ec_check_status(struct acpi_ec
*ec
, enum ec_event event
,
149 u8 status
= acpi_ec_read_status(ec
);
150 if (old_count
== atomic_read(&ec
->event_count
))
152 if (event
== ACPI_EC_EVENT_OBF_1
) {
153 if (status
& ACPI_EC_FLAG_OBF
)
155 } else if (event
== ACPI_EC_EVENT_IBF_0
) {
156 if (!(status
& ACPI_EC_FLAG_IBF
))
163 static int acpi_ec_wait(struct acpi_ec
*ec
, enum ec_event event
,
164 unsigned count
, int force_poll
)
166 if (unlikely(force_poll
) || acpi_ec_mode
== EC_POLL
) {
167 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
168 while (time_before(jiffies
, delay
)) {
169 if (acpi_ec_check_status(ec
, event
, 0))
173 if (wait_event_timeout(ec
->wait
,
174 acpi_ec_check_status(ec
, event
, count
),
175 msecs_to_jiffies(ACPI_EC_DELAY
)) ||
176 acpi_ec_check_status(ec
, event
, 0)) {
179 printk(KERN_ERR PREFIX
"acpi_ec_wait timeout,"
180 " status = %d, expect_event = %d\n",
181 acpi_ec_read_status(ec
), event
);
188 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
189 const u8
* wdata
, unsigned wdata_len
,
190 u8
* rdata
, unsigned rdata_len
,
194 unsigned count
= atomic_read(&ec
->event_count
);
195 acpi_ec_write_cmd(ec
, command
);
197 for (; wdata_len
> 0; --wdata_len
) {
198 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, count
, force_poll
);
200 printk(KERN_ERR PREFIX
201 "write_cmd timeout, command = %d\n", command
);
204 count
= atomic_read(&ec
->event_count
);
205 acpi_ec_write_data(ec
, *(wdata
++));
209 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, count
, force_poll
);
211 printk(KERN_ERR PREFIX
212 "finish-write timeout, command = %d\n", command
);
215 } else if (command
== ACPI_EC_COMMAND_QUERY
) {
216 atomic_set(&ec
->query_pending
, 0);
219 for (; rdata_len
> 0; --rdata_len
) {
220 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
, count
, force_poll
);
222 printk(KERN_ERR PREFIX
"read timeout, command = %d\n",
226 count
= atomic_read(&ec
->event_count
);
227 *(rdata
++) = acpi_ec_read_data(ec
);
233 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
234 const u8
* wdata
, unsigned wdata_len
,
235 u8
* rdata
, unsigned rdata_len
,
241 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
245 memset(rdata
, 0, rdata_len
);
247 mutex_lock(&ec
->lock
);
248 if (ec
->global_lock
) {
249 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
250 if (ACPI_FAILURE(status
)) {
251 mutex_unlock(&ec
->lock
);
256 /* Make sure GPE is enabled before doing transaction */
257 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
259 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, 0, 0);
261 printk(KERN_ERR PREFIX
262 "input buffer is not empty, aborting transaction\n");
266 status
= acpi_ec_transaction_unlocked(ec
, command
,
274 acpi_release_global_lock(glk
);
275 mutex_unlock(&ec
->lock
);
281 * Note: samsung nv5000 doesn't work with ec burst mode.
282 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
284 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
287 return acpi_ec_transaction(ec
, ACPI_EC_BURST_ENABLE
, NULL
, 0, &d
, 1, 0);
290 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
292 return acpi_ec_transaction(ec
, ACPI_EC_BURST_DISABLE
, NULL
, 0, NULL
, 0, 0);
295 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
300 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
301 &address
, 1, &d
, 1, 0);
306 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
308 u8 wdata
[2] = { address
, data
};
309 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
310 wdata
, 2, NULL
, 0, 0);
314 * Externally callable EC access functions. For now, assume 1 EC only
316 int ec_burst_enable(void)
320 return acpi_ec_burst_enable(first_ec
);
323 EXPORT_SYMBOL(ec_burst_enable
);
325 int ec_burst_disable(void)
329 return acpi_ec_burst_disable(first_ec
);
332 EXPORT_SYMBOL(ec_burst_disable
);
334 int ec_read(u8 addr
, u8
* val
)
342 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
351 EXPORT_SYMBOL(ec_read
);
353 int ec_write(u8 addr
, u8 val
)
360 err
= acpi_ec_write(first_ec
, addr
, val
);
365 EXPORT_SYMBOL(ec_write
);
367 int ec_transaction(u8 command
,
368 const u8
* wdata
, unsigned wdata_len
,
369 u8
* rdata
, unsigned rdata_len
,
375 return acpi_ec_transaction(first_ec
, command
, wdata
,
376 wdata_len
, rdata
, rdata_len
,
380 EXPORT_SYMBOL(ec_transaction
);
382 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
391 * Query the EC to find out which _Qxx method we need to evaluate.
392 * Note that successful completion of the query causes the ACPI_EC_SCI
393 * bit to be cleared (and thus clearing the interrupt source).
396 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1, 0);
407 /* --------------------------------------------------------------------------
409 -------------------------------------------------------------------------- */
410 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
411 acpi_handle handle
, acpi_ec_query_func func
,
414 struct acpi_ec_query_handler
*handler
=
415 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
419 handler
->query_bit
= query_bit
;
420 handler
->handle
= handle
;
421 handler
->func
= func
;
422 handler
->data
= data
;
423 mutex_lock(&ec
->lock
);
424 list_add_tail(&handler
->node
, &ec
->list
);
425 mutex_unlock(&ec
->lock
);
429 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
431 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
433 struct acpi_ec_query_handler
*handler
;
434 mutex_lock(&ec
->lock
);
435 list_for_each_entry(handler
, &ec
->list
, node
) {
436 if (query_bit
== handler
->query_bit
) {
437 list_del(&handler
->node
);
442 mutex_unlock(&ec
->lock
);
445 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
447 static void acpi_ec_gpe_query(void *ec_cxt
)
449 struct acpi_ec
*ec
= ec_cxt
;
451 struct acpi_ec_query_handler
*handler
, copy
;
453 if (!ec
|| acpi_ec_query(ec
, &value
))
455 mutex_lock(&ec
->lock
);
456 list_for_each_entry(handler
, &ec
->list
, node
) {
457 if (value
== handler
->query_bit
) {
458 /* have custom handler for this bit */
459 memcpy(©
, handler
, sizeof(copy
));
460 mutex_unlock(&ec
->lock
);
462 copy
.func(copy
.data
);
463 } else if (copy
.handle
) {
464 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
469 mutex_unlock(&ec
->lock
);
470 printk(KERN_ERR PREFIX
"Handler for query 0x%x is not found!\n", value
);
473 static u32
acpi_ec_gpe_handler(void *data
)
475 acpi_status status
= AE_OK
;
477 struct acpi_ec
*ec
= data
;
479 atomic_inc(&ec
->event_count
);
481 if (acpi_ec_mode
== EC_INTR
) {
485 value
= acpi_ec_read_status(ec
);
486 if ((value
& ACPI_EC_FLAG_SCI
) && !atomic_read(&ec
->query_pending
)) {
487 atomic_set(&ec
->query_pending
, 1);
489 acpi_os_execute(OSL_EC_BURST_HANDLER
, acpi_ec_gpe_query
, ec
);
492 return status
== AE_OK
?
493 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
496 /* --------------------------------------------------------------------------
497 Address Space Management
498 -------------------------------------------------------------------------- */
501 acpi_ec_space_setup(acpi_handle region_handle
,
502 u32 function
, void *handler_context
, void **return_context
)
505 * The EC object is in the handler context and is needed
506 * when calling the acpi_ec_space_handler.
508 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
509 handler_context
: NULL
;
515 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
516 u32 bits
, acpi_integer
*value
,
517 void *handler_context
, void *region_context
)
519 struct acpi_ec
*ec
= handler_context
;
520 int result
= 0, i
= 0;
523 if ((address
> 0xFF) || !value
|| !handler_context
)
524 return AE_BAD_PARAMETER
;
526 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
527 return AE_BAD_PARAMETER
;
529 if (bits
!= 8 && acpi_strict
)
530 return AE_BAD_PARAMETER
;
532 while (bits
- i
> 0) {
533 if (function
== ACPI_READ
) {
534 result
= acpi_ec_read(ec
, address
, &temp
);
535 (*value
) |= ((acpi_integer
)temp
) << i
;
537 temp
= 0xff & ((*value
) >> i
);
538 result
= acpi_ec_write(ec
, address
, temp
);
546 return AE_BAD_PARAMETER
;
559 /* --------------------------------------------------------------------------
561 -------------------------------------------------------------------------- */
563 static struct proc_dir_entry
*acpi_ec_dir
;
565 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
567 struct acpi_ec
*ec
= seq
->private;
572 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
573 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
574 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
575 seq_printf(seq
, "use global lock:\t%s\n",
576 ec
->global_lock
? "yes" : "no");
581 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
583 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
586 static struct file_operations acpi_ec_info_ops
= {
587 .open
= acpi_ec_info_open_fs
,
590 .release
= single_release
,
591 .owner
= THIS_MODULE
,
594 static int acpi_ec_add_fs(struct acpi_device
*device
)
596 struct proc_dir_entry
*entry
= NULL
;
598 if (!acpi_device_dir(device
)) {
599 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
601 if (!acpi_device_dir(device
))
605 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
606 acpi_device_dir(device
));
610 entry
->proc_fops
= &acpi_ec_info_ops
;
611 entry
->data
= acpi_driver_data(device
);
612 entry
->owner
= THIS_MODULE
;
618 static int acpi_ec_remove_fs(struct acpi_device
*device
)
621 if (acpi_device_dir(device
)) {
622 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
623 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
624 acpi_device_dir(device
) = NULL
;
630 /* --------------------------------------------------------------------------
632 -------------------------------------------------------------------------- */
634 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
636 static struct acpi_ec
*make_acpi_ec(void)
638 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
642 atomic_set(&ec
->query_pending
, 1);
643 atomic_set(&ec
->event_count
, 1);
644 mutex_init(&ec
->lock
);
645 init_waitqueue_head(&ec
->wait
);
646 INIT_LIST_HEAD(&ec
->list
);
652 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
653 void *context
, void **return_value
)
655 struct acpi_namespace_node
*node
= handle
;
656 struct acpi_ec
*ec
= context
;
658 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
659 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
664 static int ec_parse_device(struct acpi_ec
*ec
, acpi_handle handle
)
666 if (ACPI_FAILURE(acpi_walk_resources(handle
, METHOD_NAME__CRS
,
667 ec_parse_io_ports
, ec
)))
670 /* Get GPE bit assignment (EC events). */
671 /* TODO: Add support for _GPE returning a package */
672 if (ACPI_FAILURE(acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
)))
675 /* Use the global lock for all EC transactions? */
676 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
678 /* Find and register all query methods */
679 acpi_walk_namespace(ACPI_TYPE_METHOD
, handle
, 1,
680 acpi_ec_register_query_methods
, ec
, NULL
);
684 printk(KERN_INFO PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx",
685 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
690 static int acpi_ec_add(struct acpi_device
*device
)
692 struct acpi_ec
*ec
= NULL
;
697 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
698 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
704 if (ec_parse_device(ec
, device
->handle
)) {
709 /* Check if we found the boot EC */
711 if (boot_ec
->gpe
== ec
->gpe
) {
712 /* We might have incorrect info for GL at boot time */
713 mutex_lock(&boot_ec
->lock
);
714 boot_ec
->global_lock
= ec
->global_lock
;
715 /* Copy handlers from new ec into boot ec */
716 list_splice(&ec
->list
, &boot_ec
->list
);
717 mutex_unlock(&boot_ec
->lock
);
723 ec
->handle
= device
->handle
;
724 acpi_driver_data(device
) = ec
;
726 acpi_ec_add_fs(device
);
730 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
733 struct acpi_ec_query_handler
*handler
;
738 ec
= acpi_driver_data(device
);
739 mutex_lock(&ec
->lock
);
740 list_for_each_entry(handler
, &ec
->list
, node
) {
741 list_del(&handler
->node
);
744 mutex_unlock(&ec
->lock
);
745 acpi_ec_remove_fs(device
);
746 acpi_driver_data(device
) = NULL
;
750 /* Don't touch boot EC */
757 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
759 struct acpi_ec
*ec
= context
;
761 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
765 * The first address region returned is the data port, and
766 * the second address region returned is the status/command
769 if (ec
->data_addr
== 0)
770 ec
->data_addr
= resource
->data
.io
.minimum
;
771 else if (ec
->command_addr
== 0)
772 ec
->command_addr
= resource
->data
.io
.minimum
;
774 return AE_CTRL_TERMINATE
;
779 static int ec_install_handlers(struct acpi_ec
*ec
)
782 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
783 ACPI_GPE_EDGE_TRIGGERED
,
784 &acpi_ec_gpe_handler
, ec
);
785 if (ACPI_FAILURE(status
))
788 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
789 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
791 status
= acpi_install_address_space_handler(ec
->handle
,
793 &acpi_ec_space_handler
,
794 &acpi_ec_space_setup
, ec
);
795 if (ACPI_FAILURE(status
)) {
796 acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
803 static int acpi_ec_start(struct acpi_device
*device
)
811 ec
= acpi_driver_data(device
);
816 /* Boot EC is already working */
818 ret
= ec_install_handlers(ec
);
820 /* EC is fully operational, allow queries */
821 atomic_set(&ec
->query_pending
, 0);
826 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
834 ec
= acpi_driver_data(device
);
838 /* Don't touch boot EC */
842 status
= acpi_remove_address_space_handler(ec
->handle
,
844 &acpi_ec_space_handler
);
845 if (ACPI_FAILURE(status
))
848 status
= acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
849 if (ACPI_FAILURE(status
))
855 int __init
acpi_ec_ecdt_probe(void)
859 struct acpi_table_ecdt
*ecdt_ptr
;
861 boot_ec
= make_acpi_ec();
865 * Generate a boot ec context
868 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
869 (struct acpi_table_header
**)&ecdt_ptr
);
870 if (ACPI_FAILURE(status
))
873 printk(KERN_INFO PREFIX
"EC description table is found, configuring boot EC\n");
875 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
876 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
877 boot_ec
->gpe
= ecdt_ptr
->gpe
;
878 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
880 ret
= ec_install_handlers(boot_ec
);
892 static int __init
acpi_ec_init(void)
899 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
903 /* Now register the driver for the EC */
904 result
= acpi_bus_register_driver(&acpi_ec_driver
);
906 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
913 subsys_initcall(acpi_ec_init
);
915 /* EC driver currently not unloadable */
917 static void __exit
acpi_ec_exit(void)
920 acpi_bus_unregister_driver(&acpi_ec_driver
);
922 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
928 static int __init
acpi_ec_set_intr_mode(char *str
)
932 if (!get_option(&str
, &intr
))
935 acpi_ec_mode
= (intr
) ? EC_INTR
: EC_POLL
;
937 printk(KERN_NOTICE PREFIX
"%s mode.\n", intr
? "interrupt" : "polling");
942 __setup("ec_intr=", acpi_ec_set_intr_mode
);