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_NO_ADDRESS_GPE
, /* Expect GPE only for non-address event */
79 EC_FLAGS_ADDRESS
, /* Address is being written */
82 static int acpi_ec_remove(struct acpi_device
*device
, int type
);
83 static int acpi_ec_start(struct acpi_device
*device
);
84 static int acpi_ec_stop(struct acpi_device
*device
, int type
);
85 static int acpi_ec_add(struct acpi_device
*device
);
87 static const struct acpi_device_id ec_device_ids
[] = {
92 static struct acpi_driver acpi_ec_driver
= {
94 .class = ACPI_EC_CLASS
,
98 .remove
= acpi_ec_remove
,
99 .start
= acpi_ec_start
,
100 .stop
= acpi_ec_stop
,
104 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
105 /* External interfaces use first EC only, so remember */
106 typedef int (*acpi_ec_query_func
) (void *data
);
108 struct acpi_ec_query_handler
{
109 struct list_head node
;
110 acpi_ec_query_func func
;
116 static struct acpi_ec
{
119 unsigned long command_addr
;
120 unsigned long data_addr
;
121 unsigned long global_lock
;
124 wait_queue_head_t wait
;
125 struct list_head list
;
126 u8 handlers_installed
;
127 } *boot_ec
, *first_ec
;
129 /* --------------------------------------------------------------------------
130 Transaction Management
131 -------------------------------------------------------------------------- */
133 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
135 return inb(ec
->command_addr
);
138 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
140 return inb(ec
->data_addr
);
143 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
145 outb(command
, ec
->command_addr
);
148 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
150 outb(data
, ec
->data_addr
);
153 static inline int acpi_ec_check_status(struct acpi_ec
*ec
, enum ec_event event
)
155 if (test_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
))
157 if (event
== ACPI_EC_EVENT_OBF_1
) {
158 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_OBF
)
160 } else if (event
== ACPI_EC_EVENT_IBF_0
) {
161 if (!(acpi_ec_read_status(ec
) & ACPI_EC_FLAG_IBF
))
168 static int acpi_ec_wait(struct acpi_ec
*ec
, enum ec_event event
, int force_poll
)
171 if (unlikely(test_bit(EC_FLAGS_ADDRESS
, &ec
->flags
) &&
172 test_bit(EC_FLAGS_NO_ADDRESS_GPE
, &ec
->flags
)))
174 if (likely(test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
)) &&
175 likely(!force_poll
)) {
176 if (wait_event_timeout(ec
->wait
, acpi_ec_check_status(ec
, event
),
177 msecs_to_jiffies(ACPI_EC_DELAY
)))
179 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
180 if (acpi_ec_check_status(ec
, event
)) {
181 if (test_bit(EC_FLAGS_ADDRESS
, &ec
->flags
)) {
182 /* miss address GPE, don't expect it anymore */
183 printk(KERN_INFO PREFIX
"missing address confirmation, "
184 "don't expect it any longer.\n");
185 set_bit(EC_FLAGS_NO_ADDRESS_GPE
, &ec
->flags
);
187 /* missing GPEs, switch back to poll mode */
188 printk(KERN_INFO PREFIX
"missing confirmations, "
189 "switch off interrupt mode.\n");
190 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
195 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
196 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
197 while (time_before(jiffies
, delay
)) {
198 if (acpi_ec_check_status(ec
, event
))
202 printk(KERN_ERR PREFIX
"acpi_ec_wait timeout,"
203 " status = %d, expect_event = %d\n",
204 acpi_ec_read_status(ec
), event
);
207 clear_bit(EC_FLAGS_ADDRESS
, &ec
->flags
);
211 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
212 const u8
* wdata
, unsigned wdata_len
,
213 u8
* rdata
, unsigned rdata_len
,
217 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
218 acpi_ec_write_cmd(ec
, command
);
220 for (; wdata_len
> 0; --wdata_len
) {
221 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, force_poll
);
223 printk(KERN_ERR PREFIX
224 "write_cmd timeout, command = %d\n", command
);
227 /* mark the address byte written to EC */
228 if (rdata_len
+ wdata_len
> 1)
229 set_bit(EC_FLAGS_ADDRESS
, &ec
->flags
);
230 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
231 acpi_ec_write_data(ec
, *(wdata
++));
235 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, force_poll
);
237 printk(KERN_ERR PREFIX
238 "finish-write timeout, command = %d\n", command
);
241 } else if (command
== ACPI_EC_COMMAND_QUERY
)
242 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
244 for (; rdata_len
> 0; --rdata_len
) {
245 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
, force_poll
);
247 printk(KERN_ERR PREFIX
"read timeout, command = %d\n",
251 /* Don't expect GPE after last read */
253 set_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
254 *(rdata
++) = acpi_ec_read_data(ec
);
260 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
261 const u8
* wdata
, unsigned wdata_len
,
262 u8
* rdata
, unsigned rdata_len
,
268 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
272 memset(rdata
, 0, rdata_len
);
274 mutex_lock(&ec
->lock
);
275 if (ec
->global_lock
) {
276 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
277 if (ACPI_FAILURE(status
)) {
278 mutex_unlock(&ec
->lock
);
283 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
, 0);
285 printk(KERN_ERR PREFIX
286 "input buffer is not empty, aborting transaction\n");
290 status
= acpi_ec_transaction_unlocked(ec
, command
,
298 acpi_release_global_lock(glk
);
299 mutex_unlock(&ec
->lock
);
305 * Note: samsung nv5000 doesn't work with ec burst mode.
306 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
308 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
311 return acpi_ec_transaction(ec
, ACPI_EC_BURST_ENABLE
, NULL
, 0, &d
, 1, 0);
314 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
316 return acpi_ec_transaction(ec
, ACPI_EC_BURST_DISABLE
, NULL
, 0, NULL
, 0, 0);
319 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
324 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
325 &address
, 1, &d
, 1, 0);
330 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
332 u8 wdata
[2] = { address
, data
};
333 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
334 wdata
, 2, NULL
, 0, 0);
338 * Externally callable EC access functions. For now, assume 1 EC only
340 int ec_burst_enable(void)
344 return acpi_ec_burst_enable(first_ec
);
347 EXPORT_SYMBOL(ec_burst_enable
);
349 int ec_burst_disable(void)
353 return acpi_ec_burst_disable(first_ec
);
356 EXPORT_SYMBOL(ec_burst_disable
);
358 int ec_read(u8 addr
, u8
* val
)
366 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
375 EXPORT_SYMBOL(ec_read
);
377 int ec_write(u8 addr
, u8 val
)
384 err
= acpi_ec_write(first_ec
, addr
, val
);
389 EXPORT_SYMBOL(ec_write
);
391 int ec_transaction(u8 command
,
392 const u8
* wdata
, unsigned wdata_len
,
393 u8
* rdata
, unsigned rdata_len
,
399 return acpi_ec_transaction(first_ec
, command
, wdata
,
400 wdata_len
, rdata
, rdata_len
,
404 EXPORT_SYMBOL(ec_transaction
);
406 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
415 * Query the EC to find out which _Qxx method we need to evaluate.
416 * Note that successful completion of the query causes the ACPI_EC_SCI
417 * bit to be cleared (and thus clearing the interrupt source).
420 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1, 0);
431 /* --------------------------------------------------------------------------
433 -------------------------------------------------------------------------- */
434 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
435 acpi_handle handle
, acpi_ec_query_func func
,
438 struct acpi_ec_query_handler
*handler
=
439 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
443 handler
->query_bit
= query_bit
;
444 handler
->handle
= handle
;
445 handler
->func
= func
;
446 handler
->data
= data
;
447 mutex_lock(&ec
->lock
);
448 list_add(&handler
->node
, &ec
->list
);
449 mutex_unlock(&ec
->lock
);
453 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
455 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
457 struct acpi_ec_query_handler
*handler
, *tmp
;
458 mutex_lock(&ec
->lock
);
459 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
460 if (query_bit
== handler
->query_bit
) {
461 list_del(&handler
->node
);
465 mutex_unlock(&ec
->lock
);
468 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
470 static void acpi_ec_gpe_query(void *ec_cxt
)
472 struct acpi_ec
*ec
= ec_cxt
;
474 struct acpi_ec_query_handler
*handler
, copy
;
476 if (!ec
|| acpi_ec_query(ec
, &value
))
478 mutex_lock(&ec
->lock
);
479 list_for_each_entry(handler
, &ec
->list
, node
) {
480 if (value
== handler
->query_bit
) {
481 /* have custom handler for this bit */
482 memcpy(©
, handler
, sizeof(copy
));
483 mutex_unlock(&ec
->lock
);
485 copy
.func(copy
.data
);
486 } else if (copy
.handle
) {
487 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
492 mutex_unlock(&ec
->lock
);
495 static u32
acpi_ec_gpe_handler(void *data
)
497 acpi_status status
= AE_OK
;
498 struct acpi_ec
*ec
= data
;
500 clear_bit(EC_FLAGS_WAIT_GPE
, &ec
->flags
);
501 if (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))
504 if (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_SCI
) {
505 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
506 status
= acpi_os_execute(OSL_EC_BURST_HANDLER
,
507 acpi_ec_gpe_query
, ec
);
508 } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))) {
509 /* this is non-query, must be confirmation */
510 printk(KERN_INFO PREFIX
"non-query interrupt received,"
511 " switching to interrupt mode\n");
512 set_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
515 return ACPI_SUCCESS(status
) ?
516 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
519 /* --------------------------------------------------------------------------
520 Address Space Management
521 -------------------------------------------------------------------------- */
524 acpi_ec_space_setup(acpi_handle region_handle
,
525 u32 function
, void *handler_context
, void **return_context
)
528 * The EC object is in the handler context and is needed
529 * when calling the acpi_ec_space_handler.
531 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
532 handler_context
: NULL
;
538 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
539 u32 bits
, acpi_integer
*value
,
540 void *handler_context
, void *region_context
)
542 struct acpi_ec
*ec
= handler_context
;
543 int result
= 0, i
= 0;
546 if ((address
> 0xFF) || !value
|| !handler_context
)
547 return AE_BAD_PARAMETER
;
549 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
550 return AE_BAD_PARAMETER
;
552 if (bits
!= 8 && acpi_strict
)
553 return AE_BAD_PARAMETER
;
555 while (bits
- i
> 0) {
556 if (function
== ACPI_READ
) {
557 result
= acpi_ec_read(ec
, address
, &temp
);
558 (*value
) |= ((acpi_integer
)temp
) << i
;
560 temp
= 0xff & ((*value
) >> i
);
561 result
= acpi_ec_write(ec
, address
, temp
);
569 return AE_BAD_PARAMETER
;
582 /* --------------------------------------------------------------------------
584 -------------------------------------------------------------------------- */
586 static struct proc_dir_entry
*acpi_ec_dir
;
588 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
590 struct acpi_ec
*ec
= seq
->private;
595 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
596 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
597 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
598 seq_printf(seq
, "use global lock:\t%s\n",
599 ec
->global_lock
? "yes" : "no");
604 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
606 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
609 static struct file_operations acpi_ec_info_ops
= {
610 .open
= acpi_ec_info_open_fs
,
613 .release
= single_release
,
614 .owner
= THIS_MODULE
,
617 static int acpi_ec_add_fs(struct acpi_device
*device
)
619 struct proc_dir_entry
*entry
= NULL
;
621 if (!acpi_device_dir(device
)) {
622 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
624 if (!acpi_device_dir(device
))
628 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
629 acpi_device_dir(device
));
633 entry
->proc_fops
= &acpi_ec_info_ops
;
634 entry
->data
= acpi_driver_data(device
);
635 entry
->owner
= THIS_MODULE
;
641 static int acpi_ec_remove_fs(struct acpi_device
*device
)
644 if (acpi_device_dir(device
)) {
645 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
646 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
647 acpi_device_dir(device
) = NULL
;
653 /* --------------------------------------------------------------------------
655 -------------------------------------------------------------------------- */
657 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
659 static struct acpi_ec
*make_acpi_ec(void)
661 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
664 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
665 mutex_init(&ec
->lock
);
666 init_waitqueue_head(&ec
->wait
);
667 INIT_LIST_HEAD(&ec
->list
);
672 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
673 void *context
, void **return_value
)
675 struct acpi_namespace_node
*node
= handle
;
676 struct acpi_ec
*ec
= context
;
678 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
679 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
685 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
689 struct acpi_ec
*ec
= context
;
690 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
691 ec_parse_io_ports
, ec
);
692 if (ACPI_FAILURE(status
))
695 /* Get GPE bit assignment (EC events). */
696 /* TODO: Add support for _GPE returning a package */
697 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
);
698 if (ACPI_FAILURE(status
))
700 /* Find and register all query methods */
701 acpi_walk_namespace(ACPI_TYPE_METHOD
, handle
, 1,
702 acpi_ec_register_query_methods
, ec
, NULL
);
703 /* Use the global lock for all EC transactions? */
704 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
706 return AE_CTRL_TERMINATE
;
709 static void ec_remove_handlers(struct acpi_ec
*ec
)
711 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
712 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
713 printk(KERN_ERR PREFIX
"failed to remove space handler\n");
714 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
715 &acpi_ec_gpe_handler
)))
716 printk(KERN_ERR PREFIX
"failed to remove gpe handler\n");
717 ec
->handlers_installed
= 0;
720 static int acpi_ec_add(struct acpi_device
*device
)
722 struct acpi_ec
*ec
= NULL
;
726 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
727 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
729 /* Check for boot EC */
731 if (boot_ec
->handle
== device
->handle
) {
732 /* Pre-loaded EC from DSDT, just move pointer */
736 } else if (boot_ec
->handle
== ACPI_ROOT_OBJECT
) {
737 /* ECDT-based EC, time to shut it down */
738 ec_remove_handlers(boot_ec
);
740 first_ec
= boot_ec
= NULL
;
748 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
753 ec
->handle
= device
->handle
;
757 acpi_driver_data(device
) = ec
;
758 acpi_ec_add_fs(device
);
759 printk(KERN_INFO PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
760 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
761 printk(KERN_INFO PREFIX
"driver started in %s mode\n",
762 (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))?"interrupt":"poll");
766 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
769 struct acpi_ec_query_handler
*handler
, *tmp
;
774 ec
= acpi_driver_data(device
);
775 mutex_lock(&ec
->lock
);
776 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
777 list_del(&handler
->node
);
780 mutex_unlock(&ec
->lock
);
781 acpi_ec_remove_fs(device
);
782 acpi_driver_data(device
) = NULL
;
790 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
792 struct acpi_ec
*ec
= context
;
794 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
798 * The first address region returned is the data port, and
799 * the second address region returned is the status/command
802 if (ec
->data_addr
== 0)
803 ec
->data_addr
= resource
->data
.io
.minimum
;
804 else if (ec
->command_addr
== 0)
805 ec
->command_addr
= resource
->data
.io
.minimum
;
807 return AE_CTRL_TERMINATE
;
812 static int ec_install_handlers(struct acpi_ec
*ec
)
815 if (ec
->handlers_installed
)
817 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
818 ACPI_GPE_EDGE_TRIGGERED
,
819 &acpi_ec_gpe_handler
, ec
);
820 if (ACPI_FAILURE(status
))
823 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
824 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
826 status
= acpi_install_address_space_handler(ec
->handle
,
828 &acpi_ec_space_handler
,
829 &acpi_ec_space_setup
, ec
);
830 if (ACPI_FAILURE(status
)) {
831 acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
835 ec
->handlers_installed
= 1;
839 static int acpi_ec_start(struct acpi_device
*device
)
847 ec
= acpi_driver_data(device
);
852 ret
= ec_install_handlers(ec
);
854 /* EC is fully operational, allow queries */
855 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
859 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
864 ec
= acpi_driver_data(device
);
867 ec_remove_handlers(ec
);
872 int __init
acpi_ec_ecdt_probe(void)
876 struct acpi_table_ecdt
*ecdt_ptr
;
878 boot_ec
= make_acpi_ec();
882 * Generate a boot ec context
884 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
885 (struct acpi_table_header
**)&ecdt_ptr
);
886 if (ACPI_SUCCESS(status
)) {
887 printk(KERN_INFO PREFIX
"EC description table is found, configuring boot EC\n");
888 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
889 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
890 boot_ec
->gpe
= ecdt_ptr
->gpe
;
891 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
893 /* This workaround is needed only on some broken machines,
894 * which require early EC, but fail to provide ECDT */
896 printk(KERN_DEBUG PREFIX
"Look up EC in DSDT\n");
897 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
899 /* Check that acpi_get_devices actually find something */
900 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
902 /* We really need to limit this workaround, the only ASUS,
903 * which needs it, has fake EC._INI method, so use it as flag.
905 if (ACPI_FAILURE(acpi_get_handle(boot_ec
->handle
, "_INI", &x
)))
909 ret
= ec_install_handlers(boot_ec
);
920 static int __init
acpi_ec_init(void)
927 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
931 /* Now register the driver for the EC */
932 result
= acpi_bus_register_driver(&acpi_ec_driver
);
934 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
941 subsys_initcall(acpi_ec_init
);
943 /* EC driver currently not unloadable */
945 static void __exit
acpi_ec_exit(void)
948 acpi_bus_unregister_driver(&acpi_ec_driver
);
950 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);