2 * ec.c - ACPI Embedded Controller Driver (v2.1)
4 * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
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 /* Uncomment next line to get verbose printout */
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/types.h>
36 #include <linux/delay.h>
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <linux/interrupt.h>
40 #include <linux/list.h>
41 #include <linux/spinlock.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45 #include <acpi/actypes.h>
47 #define ACPI_EC_CLASS "embedded_controller"
48 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
49 #define ACPI_EC_FILE_INFO "info"
52 #define PREFIX "ACPI: EC: "
54 /* EC status register */
55 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
56 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
57 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
58 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
62 ACPI_EC_COMMAND_READ
= 0x80,
63 ACPI_EC_COMMAND_WRITE
= 0x81,
64 ACPI_EC_BURST_ENABLE
= 0x82,
65 ACPI_EC_BURST_DISABLE
= 0x83,
66 ACPI_EC_COMMAND_QUERY
= 0x84,
69 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
70 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
71 #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */
73 #define ACPI_EC_STORM_THRESHOLD 20 /* number of false interrupts
74 per one transaction */
77 EC_FLAGS_QUERY_PENDING
, /* Query is pending */
78 EC_FLAGS_GPE_MODE
, /* Expect GPE to be sent
79 * for status change */
80 EC_FLAGS_NO_GPE
, /* Don't use GPE mode */
81 EC_FLAGS_GPE_STORM
, /* GPE storm detected */
82 EC_FLAGS_HANDLERS_INSTALLED
/* Handlers for GPE and
83 * OpReg are installed */
86 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
87 /* External interfaces use first EC only, so remember */
88 typedef int (*acpi_ec_query_func
) (void *data
);
90 struct acpi_ec_query_handler
{
91 struct list_head node
;
92 acpi_ec_query_func func
;
101 unsigned short irq_count
;
107 static struct acpi_ec
{
110 unsigned long command_addr
;
111 unsigned long data_addr
;
112 unsigned long global_lock
;
115 wait_queue_head_t wait
;
116 struct list_head list
;
117 struct transaction
*curr
;
118 spinlock_t curr_lock
;
119 } *boot_ec
, *first_ec
;
122 * Some Asus system have exchanged ECDT data/command IO addresses.
124 static int print_ecdt_error(const struct dmi_system_id
*id
)
126 printk(KERN_NOTICE PREFIX
"%s detected - "
127 "ECDT has exchanged control/data I/O address\n",
132 static struct dmi_system_id __cpuinitdata ec_dmi_table
[] = {
134 print_ecdt_error
, "Asus L4R", {
135 DMI_MATCH(DMI_BIOS_VERSION
, "1008.006"),
136 DMI_MATCH(DMI_PRODUCT_NAME
, "L4R"),
137 DMI_MATCH(DMI_BOARD_NAME
, "L4R") }, NULL
},
139 print_ecdt_error
, "Asus M6R", {
140 DMI_MATCH(DMI_BIOS_VERSION
, "0207"),
141 DMI_MATCH(DMI_PRODUCT_NAME
, "M6R"),
142 DMI_MATCH(DMI_BOARD_NAME
, "M6R") }, NULL
},
146 /* --------------------------------------------------------------------------
147 Transaction Management
148 -------------------------------------------------------------------------- */
150 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
152 u8 x
= inb(ec
->command_addr
);
153 pr_debug(PREFIX
"---> status = 0x%2.2x\n", x
);
157 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
159 u8 x
= inb(ec
->data_addr
);
160 pr_debug(PREFIX
"---> data = 0x%2.2x\n", x
);
164 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
166 pr_debug(PREFIX
"<--- command = 0x%2.2x\n", command
);
167 outb(command
, ec
->command_addr
);
170 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
172 pr_debug(PREFIX
"<--- data = 0x%2.2x\n", data
);
173 outb(data
, ec
->data_addr
);
176 static int ec_transaction_done(struct acpi_ec
*ec
)
180 spin_lock_irqsave(&ec
->curr_lock
, flags
);
181 if (!ec
->curr
|| (!ec
->curr
->wlen
&& !ec
->curr
->rlen
))
183 spin_unlock_irqrestore(&ec
->curr_lock
, flags
);
187 static void gpe_transaction(struct acpi_ec
*ec
, u8 status
)
190 spin_lock_irqsave(&ec
->curr_lock
, flags
);
193 if (ec
->curr
->wlen
> 0) {
194 if ((status
& ACPI_EC_FLAG_IBF
) == 0) {
195 acpi_ec_write_data(ec
, *(ec
->curr
->wdata
++));
198 /* false interrupt, state didn't change */
199 ++ec
->curr
->irq_count
;
201 } else if (ec
->curr
->rlen
> 0) {
202 if ((status
& ACPI_EC_FLAG_OBF
) == 1) {
203 *(ec
->curr
->rdata
++) = acpi_ec_read_data(ec
);
206 /* false interrupt, state didn't change */
207 ++ec
->curr
->irq_count
;
210 spin_unlock_irqrestore(&ec
->curr_lock
, flags
);
213 static int acpi_ec_wait(struct acpi_ec
*ec
)
215 if (wait_event_timeout(ec
->wait
, ec_transaction_done(ec
),
216 msecs_to_jiffies(ACPI_EC_DELAY
)))
218 /* missing GPEs, switch back to poll mode */
219 if (printk_ratelimit())
220 pr_info(PREFIX
"missing confirmations, "
221 "switch off interrupt mode.\n");
222 set_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
223 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
227 static void acpi_ec_gpe_query(void *ec_cxt
);
229 static int ec_check_sci(struct acpi_ec
*ec
, u8 state
)
231 if (state
& ACPI_EC_FLAG_SCI
) {
232 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
233 return acpi_os_execute(OSL_EC_BURST_HANDLER
,
234 acpi_ec_gpe_query
, ec
);
239 static int ec_poll(struct acpi_ec
*ec
)
241 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
243 while (time_before(jiffies
, delay
)) {
244 gpe_transaction(ec
, acpi_ec_read_status(ec
));
246 if (ec_transaction_done(ec
))
252 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
,
253 struct transaction
*t
,
258 pr_debug(PREFIX
"transaction start\n");
259 /* disable GPE during transaction if storm is detected */
260 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
261 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
262 acpi_disable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
264 /* start transaction */
265 spin_lock_irqsave(&ec
->curr_lock
, tmp
);
266 /* following two actions should be kept atomic */
269 acpi_ec_write_cmd(ec
, ec
->curr
->command
);
270 if (ec
->curr
->command
== ACPI_EC_COMMAND_QUERY
)
271 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
272 spin_unlock_irqrestore(&ec
->curr_lock
, tmp
);
273 /* if we selected poll mode or failed in GPE-mode do a poll loop */
275 !test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) ||
278 pr_debug(PREFIX
"transaction end\n");
279 spin_lock_irqsave(&ec
->curr_lock
, tmp
);
281 spin_unlock_irqrestore(&ec
->curr_lock
, tmp
);
282 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
283 /* check if we received SCI during transaction */
284 ec_check_sci(ec
, acpi_ec_read_status(ec
));
285 /* it is safe to enable GPE outside of transaction */
286 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
287 } else if (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) &&
288 t
->irq_count
> ACPI_EC_STORM_THRESHOLD
) {
289 pr_debug(PREFIX
"GPE storm detected\n");
290 set_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
);
295 static int ec_check_ibf0(struct acpi_ec
*ec
)
297 u8 status
= acpi_ec_read_status(ec
);
298 return (status
& ACPI_EC_FLAG_IBF
) == 0;
301 static int ec_wait_ibf0(struct acpi_ec
*ec
)
303 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
304 /* interrupt wait manually if GPE mode is not active */
305 unsigned long timeout
= test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) ?
306 msecs_to_jiffies(ACPI_EC_DELAY
) : msecs_to_jiffies(1);
307 while (time_before(jiffies
, delay
))
308 if (wait_event_timeout(ec
->wait
, ec_check_ibf0(ec
), timeout
))
313 static int acpi_ec_transaction(struct acpi_ec
*ec
, struct transaction
*t
,
318 if (!ec
|| (!t
) || (t
->wlen
&& !t
->wdata
) || (t
->rlen
&& !t
->rdata
))
321 memset(t
->rdata
, 0, t
->rlen
);
322 mutex_lock(&ec
->lock
);
323 if (ec
->global_lock
) {
324 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
325 if (ACPI_FAILURE(status
)) {
330 if (ec_wait_ibf0(ec
)) {
331 pr_err(PREFIX
"input buffer is not empty, "
332 "aborting transaction\n");
336 status
= acpi_ec_transaction_unlocked(ec
, t
, force_poll
);
339 acpi_release_global_lock(glk
);
341 mutex_unlock(&ec
->lock
);
346 * Note: samsung nv5000 doesn't work with ec burst mode.
347 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
349 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
352 struct transaction t
= {.command
= ACPI_EC_BURST_ENABLE
,
353 .wdata
= NULL
, .rdata
= &d
,
354 .wlen
= 0, .rlen
= 1};
356 return acpi_ec_transaction(ec
, &t
, 0);
359 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
361 struct transaction t
= {.command
= ACPI_EC_BURST_DISABLE
,
362 .wdata
= NULL
, .rdata
= NULL
,
363 .wlen
= 0, .rlen
= 0};
365 return (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_BURST
) ?
366 acpi_ec_transaction(ec
, &t
, 0) : 0;
369 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
373 struct transaction t
= {.command
= ACPI_EC_COMMAND_READ
,
374 .wdata
= &address
, .rdata
= &d
,
375 .wlen
= 1, .rlen
= 1};
377 result
= acpi_ec_transaction(ec
, &t
, 0);
382 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
384 u8 wdata
[2] = { address
, data
};
385 struct transaction t
= {.command
= ACPI_EC_COMMAND_WRITE
,
386 .wdata
= wdata
, .rdata
= NULL
,
387 .wlen
= 2, .rlen
= 0};
389 return acpi_ec_transaction(ec
, &t
, 0);
393 * Externally callable EC access functions. For now, assume 1 EC only
395 int ec_burst_enable(void)
399 return acpi_ec_burst_enable(first_ec
);
402 EXPORT_SYMBOL(ec_burst_enable
);
404 int ec_burst_disable(void)
408 return acpi_ec_burst_disable(first_ec
);
411 EXPORT_SYMBOL(ec_burst_disable
);
413 int ec_read(u8 addr
, u8
* val
)
421 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
430 EXPORT_SYMBOL(ec_read
);
432 int ec_write(u8 addr
, u8 val
)
439 err
= acpi_ec_write(first_ec
, addr
, val
);
444 EXPORT_SYMBOL(ec_write
);
446 int ec_transaction(u8 command
,
447 const u8
* wdata
, unsigned wdata_len
,
448 u8
* rdata
, unsigned rdata_len
,
451 struct transaction t
= {.command
= command
,
452 .wdata
= wdata
, .rdata
= rdata
,
453 .wlen
= wdata_len
, .rlen
= rdata_len
};
457 return acpi_ec_transaction(first_ec
, &t
, force_poll
);
460 EXPORT_SYMBOL(ec_transaction
);
462 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
466 struct transaction t
= {.command
= ACPI_EC_COMMAND_QUERY
,
467 .wdata
= NULL
, .rdata
= &d
,
468 .wlen
= 0, .rlen
= 1};
473 * Query the EC to find out which _Qxx method we need to evaluate.
474 * Note that successful completion of the query causes the ACPI_EC_SCI
475 * bit to be cleared (and thus clearing the interrupt source).
478 result
= acpi_ec_transaction(ec
, &t
, 0);
489 /* --------------------------------------------------------------------------
491 -------------------------------------------------------------------------- */
492 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
493 acpi_handle handle
, acpi_ec_query_func func
,
496 struct acpi_ec_query_handler
*handler
=
497 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
501 handler
->query_bit
= query_bit
;
502 handler
->handle
= handle
;
503 handler
->func
= func
;
504 handler
->data
= data
;
505 mutex_lock(&ec
->lock
);
506 list_add(&handler
->node
, &ec
->list
);
507 mutex_unlock(&ec
->lock
);
511 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
513 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
515 struct acpi_ec_query_handler
*handler
, *tmp
;
516 mutex_lock(&ec
->lock
);
517 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
518 if (query_bit
== handler
->query_bit
) {
519 list_del(&handler
->node
);
523 mutex_unlock(&ec
->lock
);
526 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
528 static void acpi_ec_gpe_query(void *ec_cxt
)
530 struct acpi_ec
*ec
= ec_cxt
;
532 struct acpi_ec_query_handler
*handler
, copy
;
534 if (!ec
|| acpi_ec_query(ec
, &value
))
536 mutex_lock(&ec
->lock
);
537 list_for_each_entry(handler
, &ec
->list
, node
) {
538 if (value
== handler
->query_bit
) {
539 /* have custom handler for this bit */
540 memcpy(©
, handler
, sizeof(copy
));
541 mutex_unlock(&ec
->lock
);
543 copy
.func(copy
.data
);
544 } else if (copy
.handle
) {
545 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
550 mutex_unlock(&ec
->lock
);
553 static u32
acpi_ec_gpe_handler(void *data
)
555 struct acpi_ec
*ec
= data
;
558 pr_debug(PREFIX
"~~~> interrupt\n");
559 status
= acpi_ec_read_status(ec
);
561 gpe_transaction(ec
, status
);
562 if (ec_transaction_done(ec
) && (status
& ACPI_EC_FLAG_IBF
) == 0)
565 ec_check_sci(ec
, status
);
566 if (!test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) &&
567 !test_bit(EC_FLAGS_NO_GPE
, &ec
->flags
)) {
568 /* this is non-query, must be confirmation */
569 if (printk_ratelimit())
570 pr_info(PREFIX
"non-query interrupt received,"
571 " switching to interrupt mode\n");
572 set_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
574 return ACPI_INTERRUPT_HANDLED
;
577 /* --------------------------------------------------------------------------
578 Address Space Management
579 -------------------------------------------------------------------------- */
582 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
583 u32 bits
, acpi_integer
*value
,
584 void *handler_context
, void *region_context
)
586 struct acpi_ec
*ec
= handler_context
;
590 if ((address
> 0xFF) || !value
|| !handler_context
)
591 return AE_BAD_PARAMETER
;
593 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
594 return AE_BAD_PARAMETER
;
596 if (bits
!= 8 && acpi_strict
)
597 return AE_BAD_PARAMETER
;
599 acpi_ec_burst_enable(ec
);
601 if (function
== ACPI_READ
) {
602 result
= acpi_ec_read(ec
, address
, &temp
);
605 temp
= 0xff & (*value
);
606 result
= acpi_ec_write(ec
, address
, temp
);
609 for (i
= 8; unlikely(bits
- i
> 0); i
+= 8) {
611 if (function
== ACPI_READ
) {
612 result
= acpi_ec_read(ec
, address
, &temp
);
613 (*value
) |= ((acpi_integer
)temp
) << i
;
615 temp
= 0xff & ((*value
) >> i
);
616 result
= acpi_ec_write(ec
, address
, temp
);
620 acpi_ec_burst_disable(ec
);
624 return AE_BAD_PARAMETER
;
637 /* --------------------------------------------------------------------------
639 -------------------------------------------------------------------------- */
641 static struct proc_dir_entry
*acpi_ec_dir
;
643 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
645 struct acpi_ec
*ec
= seq
->private;
650 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
651 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
652 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
653 seq_printf(seq
, "use global lock:\t%s\n",
654 ec
->global_lock
? "yes" : "no");
659 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
661 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
664 static struct file_operations acpi_ec_info_ops
= {
665 .open
= acpi_ec_info_open_fs
,
668 .release
= single_release
,
669 .owner
= THIS_MODULE
,
672 static int acpi_ec_add_fs(struct acpi_device
*device
)
674 struct proc_dir_entry
*entry
= NULL
;
676 if (!acpi_device_dir(device
)) {
677 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
679 if (!acpi_device_dir(device
))
683 entry
= proc_create_data(ACPI_EC_FILE_INFO
, S_IRUGO
,
684 acpi_device_dir(device
),
685 &acpi_ec_info_ops
, acpi_driver_data(device
));
691 static int acpi_ec_remove_fs(struct acpi_device
*device
)
694 if (acpi_device_dir(device
)) {
695 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
696 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
697 acpi_device_dir(device
) = NULL
;
703 /* --------------------------------------------------------------------------
705 -------------------------------------------------------------------------- */
707 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
709 static struct acpi_ec
*make_acpi_ec(void)
711 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
714 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
715 mutex_init(&ec
->lock
);
716 init_waitqueue_head(&ec
->wait
);
717 INIT_LIST_HEAD(&ec
->list
);
718 spin_lock_init(&ec
->curr_lock
);
723 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
724 void *context
, void **return_value
)
726 struct acpi_namespace_node
*node
= handle
;
727 struct acpi_ec
*ec
= context
;
729 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
730 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
736 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
740 struct acpi_ec
*ec
= context
;
741 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
742 ec_parse_io_ports
, ec
);
743 if (ACPI_FAILURE(status
))
746 /* Get GPE bit assignment (EC events). */
747 /* TODO: Add support for _GPE returning a package */
748 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
);
749 if (ACPI_FAILURE(status
))
751 /* Use the global lock for all EC transactions? */
752 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
754 return AE_CTRL_TERMINATE
;
757 static void ec_remove_handlers(struct acpi_ec
*ec
)
759 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
760 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
761 pr_err(PREFIX
"failed to remove space handler\n");
762 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
763 &acpi_ec_gpe_handler
)))
764 pr_err(PREFIX
"failed to remove gpe handler\n");
765 clear_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
768 static int acpi_ec_add(struct acpi_device
*device
)
770 struct acpi_ec
*ec
= NULL
;
774 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
775 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
777 /* Check for boot EC */
779 (boot_ec
->handle
== device
->handle
||
780 boot_ec
->handle
== ACPI_ROOT_OBJECT
)) {
787 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
794 ec
->handle
= device
->handle
;
796 /* Find and register all query methods */
797 acpi_walk_namespace(ACPI_TYPE_METHOD
, ec
->handle
, 1,
798 acpi_ec_register_query_methods
, ec
, NULL
);
802 device
->driver_data
= ec
;
803 acpi_ec_add_fs(device
);
804 pr_info(PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
805 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
806 pr_info(PREFIX
"driver started in %s mode\n",
807 (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))?"interrupt":"poll");
811 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
814 struct acpi_ec_query_handler
*handler
, *tmp
;
819 ec
= acpi_driver_data(device
);
820 mutex_lock(&ec
->lock
);
821 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
822 list_del(&handler
->node
);
825 mutex_unlock(&ec
->lock
);
826 acpi_ec_remove_fs(device
);
827 device
->driver_data
= NULL
;
835 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
837 struct acpi_ec
*ec
= context
;
839 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
843 * The first address region returned is the data port, and
844 * the second address region returned is the status/command
847 if (ec
->data_addr
== 0)
848 ec
->data_addr
= resource
->data
.io
.minimum
;
849 else if (ec
->command_addr
== 0)
850 ec
->command_addr
= resource
->data
.io
.minimum
;
852 return AE_CTRL_TERMINATE
;
857 static int ec_install_handlers(struct acpi_ec
*ec
)
860 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
))
862 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
863 ACPI_GPE_EDGE_TRIGGERED
,
864 &acpi_ec_gpe_handler
, ec
);
865 if (ACPI_FAILURE(status
))
867 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
868 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
869 status
= acpi_install_address_space_handler(ec
->handle
,
871 &acpi_ec_space_handler
,
873 if (ACPI_FAILURE(status
)) {
874 if (status
== AE_NOT_FOUND
) {
876 * Maybe OS fails in evaluating the _REG object.
877 * The AE_NOT_FOUND error will be ignored and OS
878 * continue to initialize EC.
880 printk(KERN_ERR
"Fail in evaluating the _REG object"
881 " of EC device. Broken bios is suspected.\n");
883 acpi_remove_gpe_handler(NULL
, ec
->gpe
,
884 &acpi_ec_gpe_handler
);
889 set_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
893 static int acpi_ec_start(struct acpi_device
*device
)
901 ec
= acpi_driver_data(device
);
906 ret
= ec_install_handlers(ec
);
908 /* EC is fully operational, allow queries */
909 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
913 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
918 ec
= acpi_driver_data(device
);
921 ec_remove_handlers(ec
);
926 int __init
acpi_boot_ec_enable(void)
928 if (!boot_ec
|| test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &boot_ec
->flags
))
930 if (!ec_install_handlers(boot_ec
)) {
937 static const struct acpi_device_id ec_device_ids
[] = {
942 int __init
acpi_ec_ecdt_probe(void)
946 struct acpi_table_ecdt
*ecdt_ptr
;
948 boot_ec
= make_acpi_ec();
952 * Generate a boot ec context
954 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
955 (struct acpi_table_header
**)&ecdt_ptr
);
956 if (ACPI_SUCCESS(status
)) {
957 pr_info(PREFIX
"EC description table is found, configuring boot EC\n");
958 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
959 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
960 if (dmi_check_system(ec_dmi_table
)) {
962 * If the board falls into ec_dmi_table, it means
963 * that ECDT table gives the incorrect command/status
964 * & data I/O address. Just fix it.
966 boot_ec
->data_addr
= ecdt_ptr
->control
.address
;
967 boot_ec
->command_addr
= ecdt_ptr
->data
.address
;
969 boot_ec
->gpe
= ecdt_ptr
->gpe
;
970 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
971 acpi_get_handle(ACPI_ROOT_OBJECT
, ecdt_ptr
->id
, &boot_ec
->handle
);
973 /* This workaround is needed only on some broken machines,
974 * which require early EC, but fail to provide ECDT */
976 printk(KERN_DEBUG PREFIX
"Look up EC in DSDT\n");
977 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
979 /* Check that acpi_get_devices actually find something */
980 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
982 /* We really need to limit this workaround, the only ASUS,
983 * which needs it, has fake EC._INI method, so use it as flag.
984 * Keep boot_ec struct as it will be needed soon.
986 if (ACPI_FAILURE(acpi_get_handle(boot_ec
->handle
, "_INI", &x
)))
990 ret
= ec_install_handlers(boot_ec
);
1001 static int acpi_ec_suspend(struct acpi_device
*device
, pm_message_t state
)
1003 struct acpi_ec
*ec
= acpi_driver_data(device
);
1004 /* Stop using GPE */
1005 set_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
1006 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
1007 acpi_disable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
1011 static int acpi_ec_resume(struct acpi_device
*device
)
1013 struct acpi_ec
*ec
= acpi_driver_data(device
);
1014 /* Enable use of GPE back */
1015 clear_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
1016 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
1020 static struct acpi_driver acpi_ec_driver
= {
1022 .class = ACPI_EC_CLASS
,
1023 .ids
= ec_device_ids
,
1026 .remove
= acpi_ec_remove
,
1027 .start
= acpi_ec_start
,
1028 .stop
= acpi_ec_stop
,
1029 .suspend
= acpi_ec_suspend
,
1030 .resume
= acpi_ec_resume
,
1034 static int __init
acpi_ec_init(void)
1041 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
1045 /* Now register the driver for the EC */
1046 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1048 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1055 subsys_initcall(acpi_ec_init
);
1057 /* EC driver currently not unloadable */
1059 static void __exit
acpi_ec_exit(void)
1062 acpi_bus_unregister_driver(&acpi_ec_driver
);
1064 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);