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
;
98 struct transaction_data
{
101 unsigned short irq_count
;
106 static struct acpi_ec
{
109 unsigned long command_addr
;
110 unsigned long data_addr
;
111 unsigned long global_lock
;
114 wait_queue_head_t wait
;
115 struct list_head list
;
116 struct transaction_data
*t
;
118 } *boot_ec
, *first_ec
;
121 * Some Asus system have exchanged ECDT data/command IO addresses.
123 static int print_ecdt_error(const struct dmi_system_id
*id
)
125 printk(KERN_NOTICE PREFIX
"%s detected - "
126 "ECDT has exchanged control/data I/O address\n",
131 static struct dmi_system_id __cpuinitdata ec_dmi_table
[] = {
133 print_ecdt_error
, "Asus L4R", {
134 DMI_MATCH(DMI_BIOS_VERSION
, "1008.006"),
135 DMI_MATCH(DMI_PRODUCT_NAME
, "L4R"),
136 DMI_MATCH(DMI_BOARD_NAME
, "L4R") }, NULL
},
138 print_ecdt_error
, "Asus M6R", {
139 DMI_MATCH(DMI_BIOS_VERSION
, "0207"),
140 DMI_MATCH(DMI_PRODUCT_NAME
, "M6R"),
141 DMI_MATCH(DMI_BOARD_NAME
, "M6R") }, NULL
},
145 /* --------------------------------------------------------------------------
146 Transaction Management
147 -------------------------------------------------------------------------- */
149 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
151 u8 x
= inb(ec
->command_addr
);
152 pr_debug(PREFIX
"---> status = 0x%2.2x\n", x
);
156 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
158 u8 x
= inb(ec
->data_addr
);
159 pr_debug(PREFIX
"---> data = 0x%2.2x\n", x
);
163 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
165 pr_debug(PREFIX
"<--- command = 0x%2.2x\n", command
);
166 outb(command
, ec
->command_addr
);
169 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
171 pr_debug(PREFIX
"<--- data = 0x%2.2x\n", data
);
172 outb(data
, ec
->data_addr
);
175 static int ec_transaction_done(struct acpi_ec
*ec
)
179 spin_lock_irqsave(&ec
->t_lock
, flags
);
180 if (!ec
->t
|| (!ec
->t
->wlen
&& !ec
->t
->rlen
))
182 spin_unlock_irqrestore(&ec
->t_lock
, flags
);
186 static void gpe_transaction(struct acpi_ec
*ec
, u8 status
)
189 spin_lock_irqsave(&ec
->t_lock
, flags
);
192 if (ec
->t
->wlen
> 0) {
193 if ((status
& ACPI_EC_FLAG_IBF
) == 0) {
194 acpi_ec_write_data(ec
, *(ec
->t
->wdata
++));
197 /* false interrupt, state didn't change */
200 } else if (ec
->t
->rlen
> 0) {
201 if ((status
& ACPI_EC_FLAG_OBF
) == 1) {
202 *(ec
->t
->rdata
++) = acpi_ec_read_data(ec
);
205 /* false interrupt, state didn't change */
209 spin_unlock_irqrestore(&ec
->t_lock
, flags
);
212 static int acpi_ec_wait(struct acpi_ec
*ec
)
214 if (wait_event_timeout(ec
->wait
, ec_transaction_done(ec
),
215 msecs_to_jiffies(ACPI_EC_DELAY
)))
217 /* missing GPEs, switch back to poll mode */
218 if (printk_ratelimit())
219 pr_info(PREFIX
"missing confirmations, "
220 "switch off interrupt mode.\n");
221 set_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
222 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
226 static void acpi_ec_gpe_query(void *ec_cxt
);
228 static int ec_check_sci(struct acpi_ec
*ec
, u8 state
)
230 if (state
& ACPI_EC_FLAG_SCI
) {
231 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
232 return acpi_os_execute(OSL_EC_BURST_HANDLER
,
233 acpi_ec_gpe_query
, ec
);
238 static int ec_poll(struct acpi_ec
*ec
)
240 unsigned long delay
= jiffies
+ msecs_to_jiffies(ACPI_EC_DELAY
);
242 while (time_before(jiffies
, delay
)) {
243 gpe_transaction(ec
, acpi_ec_read_status(ec
));
245 if (ec_transaction_done(ec
))
251 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
252 const u8
* wdata
, unsigned wdata_len
,
253 u8
* rdata
, unsigned rdata_len
,
257 struct transaction_data t
= {.wdata
= wdata
, .rdata
= rdata
,
258 .wlen
= wdata_len
, .rlen
= rdata_len
,
261 pr_debug(PREFIX
"transaction start\n");
262 /* disable GPE during transaction if storm is detected */
263 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
264 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
265 acpi_disable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
267 /* start transaction */
268 spin_lock_irqsave(&ec
->t_lock
, tmp
);
269 /* following two actions should be kept atomic */
271 acpi_ec_write_cmd(ec
, command
);
272 if (command
== ACPI_EC_COMMAND_QUERY
)
273 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
274 spin_unlock_irqrestore(&ec
->t_lock
, tmp
);
275 /* if we selected poll mode or failed in GPE-mode do a poll loop */
277 !test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) ||
280 pr_debug(PREFIX
"transaction end\n");
281 spin_lock_irqsave(&ec
->t_lock
, tmp
);
283 spin_unlock_irqrestore(&ec
->t_lock
, tmp
);
284 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
285 /* check if we received SCI during transaction */
286 ec_check_sci(ec
, acpi_ec_read_status(ec
));
287 /* it is safe to enable GPE outside of transaction */
288 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
289 } else if (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) &&
290 t
.irq_count
> ACPI_EC_STORM_THRESHOLD
) {
291 pr_debug(PREFIX
"GPE storm detected\n");
292 set_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
);
297 static int ec_check_ibf0(struct acpi_ec
*ec
)
299 u8 status
= acpi_ec_read_status(ec
);
300 return (status
& ACPI_EC_FLAG_IBF
) == 0;
303 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
304 const u8
* wdata
, unsigned wdata_len
,
305 u8
* rdata
, unsigned rdata_len
,
310 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
313 memset(rdata
, 0, rdata_len
);
314 mutex_lock(&ec
->lock
);
315 if (ec
->global_lock
) {
316 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
317 if (ACPI_FAILURE(status
)) {
322 if (!wait_event_timeout(ec
->wait
, ec_check_ibf0(ec
),
323 msecs_to_jiffies(ACPI_EC_DELAY
))) {
324 pr_err(PREFIX
"input buffer is not empty, "
325 "aborting transaction\n");
329 status
= acpi_ec_transaction_unlocked(ec
, command
,
335 acpi_release_global_lock(glk
);
337 mutex_unlock(&ec
->lock
);
342 * Note: samsung nv5000 doesn't work with ec burst mode.
343 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
345 int acpi_ec_burst_enable(struct acpi_ec
*ec
)
348 return acpi_ec_transaction(ec
, ACPI_EC_BURST_ENABLE
, NULL
, 0, &d
, 1, 0);
351 int acpi_ec_burst_disable(struct acpi_ec
*ec
)
353 return (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_BURST
) ?
354 acpi_ec_transaction(ec
, ACPI_EC_BURST_DISABLE
,
355 NULL
, 0, NULL
, 0, 0) : 0;
358 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
363 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
364 &address
, 1, &d
, 1, 0);
369 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
371 u8 wdata
[2] = { address
, data
};
372 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
373 wdata
, 2, NULL
, 0, 0);
377 * Externally callable EC access functions. For now, assume 1 EC only
379 int ec_burst_enable(void)
383 return acpi_ec_burst_enable(first_ec
);
386 EXPORT_SYMBOL(ec_burst_enable
);
388 int ec_burst_disable(void)
392 return acpi_ec_burst_disable(first_ec
);
395 EXPORT_SYMBOL(ec_burst_disable
);
397 int ec_read(u8 addr
, u8
* val
)
405 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
414 EXPORT_SYMBOL(ec_read
);
416 int ec_write(u8 addr
, u8 val
)
423 err
= acpi_ec_write(first_ec
, addr
, val
);
428 EXPORT_SYMBOL(ec_write
);
430 int ec_transaction(u8 command
,
431 const u8
* wdata
, unsigned wdata_len
,
432 u8
* rdata
, unsigned rdata_len
,
438 return acpi_ec_transaction(first_ec
, command
, wdata
,
439 wdata_len
, rdata
, rdata_len
,
443 EXPORT_SYMBOL(ec_transaction
);
445 static int acpi_ec_query(struct acpi_ec
*ec
, u8
* data
)
454 * Query the EC to find out which _Qxx method we need to evaluate.
455 * Note that successful completion of the query causes the ACPI_EC_SCI
456 * bit to be cleared (and thus clearing the interrupt source).
459 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1, 0);
470 /* --------------------------------------------------------------------------
472 -------------------------------------------------------------------------- */
473 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
474 acpi_handle handle
, acpi_ec_query_func func
,
477 struct acpi_ec_query_handler
*handler
=
478 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
482 handler
->query_bit
= query_bit
;
483 handler
->handle
= handle
;
484 handler
->func
= func
;
485 handler
->data
= data
;
486 mutex_lock(&ec
->lock
);
487 list_add(&handler
->node
, &ec
->list
);
488 mutex_unlock(&ec
->lock
);
492 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
494 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
496 struct acpi_ec_query_handler
*handler
, *tmp
;
497 mutex_lock(&ec
->lock
);
498 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
499 if (query_bit
== handler
->query_bit
) {
500 list_del(&handler
->node
);
504 mutex_unlock(&ec
->lock
);
507 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
509 static void acpi_ec_gpe_query(void *ec_cxt
)
511 struct acpi_ec
*ec
= ec_cxt
;
513 struct acpi_ec_query_handler
*handler
, copy
;
515 if (!ec
|| acpi_ec_query(ec
, &value
))
517 mutex_lock(&ec
->lock
);
518 list_for_each_entry(handler
, &ec
->list
, node
) {
519 if (value
== handler
->query_bit
) {
520 /* have custom handler for this bit */
521 memcpy(©
, handler
, sizeof(copy
));
522 mutex_unlock(&ec
->lock
);
524 copy
.func(copy
.data
);
525 } else if (copy
.handle
) {
526 acpi_evaluate_object(copy
.handle
, NULL
, NULL
, NULL
);
531 mutex_unlock(&ec
->lock
);
534 static u32
acpi_ec_gpe_handler(void *data
)
536 struct acpi_ec
*ec
= data
;
539 pr_debug(PREFIX
"~~~> interrupt\n");
540 status
= acpi_ec_read_status(ec
);
542 gpe_transaction(ec
, status
);
543 if (ec_transaction_done(ec
) && (status
& ACPI_EC_FLAG_IBF
) == 0)
546 ec_check_sci(ec
, status
);
547 if (!test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
) &&
548 !test_bit(EC_FLAGS_NO_GPE
, &ec
->flags
)) {
549 /* this is non-query, must be confirmation */
550 if (printk_ratelimit())
551 pr_info(PREFIX
"non-query interrupt received,"
552 " switching to interrupt mode\n");
553 set_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
555 return ACPI_INTERRUPT_HANDLED
;
558 /* --------------------------------------------------------------------------
559 Address Space Management
560 -------------------------------------------------------------------------- */
563 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
564 u32 bits
, acpi_integer
*value
,
565 void *handler_context
, void *region_context
)
567 struct acpi_ec
*ec
= handler_context
;
571 if ((address
> 0xFF) || !value
|| !handler_context
)
572 return AE_BAD_PARAMETER
;
574 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
575 return AE_BAD_PARAMETER
;
577 if (bits
!= 8 && acpi_strict
)
578 return AE_BAD_PARAMETER
;
580 acpi_ec_burst_enable(ec
);
582 if (function
== ACPI_READ
) {
583 result
= acpi_ec_read(ec
, address
, &temp
);
586 temp
= 0xff & (*value
);
587 result
= acpi_ec_write(ec
, address
, temp
);
590 for (i
= 8; unlikely(bits
- i
> 0); i
+= 8) {
592 if (function
== ACPI_READ
) {
593 result
= acpi_ec_read(ec
, address
, &temp
);
594 (*value
) |= ((acpi_integer
)temp
) << i
;
596 temp
= 0xff & ((*value
) >> i
);
597 result
= acpi_ec_write(ec
, address
, temp
);
601 acpi_ec_burst_disable(ec
);
605 return AE_BAD_PARAMETER
;
618 /* --------------------------------------------------------------------------
620 -------------------------------------------------------------------------- */
622 static struct proc_dir_entry
*acpi_ec_dir
;
624 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
626 struct acpi_ec
*ec
= seq
->private;
631 seq_printf(seq
, "gpe:\t\t\t0x%02x\n", (u32
) ec
->gpe
);
632 seq_printf(seq
, "ports:\t\t\t0x%02x, 0x%02x\n",
633 (unsigned)ec
->command_addr
, (unsigned)ec
->data_addr
);
634 seq_printf(seq
, "use global lock:\t%s\n",
635 ec
->global_lock
? "yes" : "no");
640 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
642 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
645 static struct file_operations acpi_ec_info_ops
= {
646 .open
= acpi_ec_info_open_fs
,
649 .release
= single_release
,
650 .owner
= THIS_MODULE
,
653 static int acpi_ec_add_fs(struct acpi_device
*device
)
655 struct proc_dir_entry
*entry
= NULL
;
657 if (!acpi_device_dir(device
)) {
658 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
660 if (!acpi_device_dir(device
))
664 entry
= proc_create_data(ACPI_EC_FILE_INFO
, S_IRUGO
,
665 acpi_device_dir(device
),
666 &acpi_ec_info_ops
, acpi_driver_data(device
));
672 static int acpi_ec_remove_fs(struct acpi_device
*device
)
675 if (acpi_device_dir(device
)) {
676 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
677 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
678 acpi_device_dir(device
) = NULL
;
684 /* --------------------------------------------------------------------------
686 -------------------------------------------------------------------------- */
688 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
690 static struct acpi_ec
*make_acpi_ec(void)
692 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
695 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
696 mutex_init(&ec
->lock
);
697 init_waitqueue_head(&ec
->wait
);
698 INIT_LIST_HEAD(&ec
->list
);
699 spin_lock_init(&ec
->t_lock
);
704 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
705 void *context
, void **return_value
)
707 struct acpi_namespace_node
*node
= handle
;
708 struct acpi_ec
*ec
= context
;
710 if (sscanf(node
->name
.ascii
, "_Q%x", &value
) == 1) {
711 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
717 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
721 struct acpi_ec
*ec
= context
;
722 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
723 ec_parse_io_ports
, ec
);
724 if (ACPI_FAILURE(status
))
727 /* Get GPE bit assignment (EC events). */
728 /* TODO: Add support for _GPE returning a package */
729 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &ec
->gpe
);
730 if (ACPI_FAILURE(status
))
732 /* Use the global lock for all EC transactions? */
733 acpi_evaluate_integer(handle
, "_GLK", NULL
, &ec
->global_lock
);
735 return AE_CTRL_TERMINATE
;
738 static void ec_remove_handlers(struct acpi_ec
*ec
)
740 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
741 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
742 pr_err(PREFIX
"failed to remove space handler\n");
743 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
744 &acpi_ec_gpe_handler
)))
745 pr_err(PREFIX
"failed to remove gpe handler\n");
746 clear_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
749 static int acpi_ec_add(struct acpi_device
*device
)
751 struct acpi_ec
*ec
= NULL
;
755 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
756 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
758 /* Check for boot EC */
760 (boot_ec
->handle
== device
->handle
||
761 boot_ec
->handle
== ACPI_ROOT_OBJECT
)) {
768 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
775 ec
->handle
= device
->handle
;
777 /* Find and register all query methods */
778 acpi_walk_namespace(ACPI_TYPE_METHOD
, ec
->handle
, 1,
779 acpi_ec_register_query_methods
, ec
, NULL
);
783 acpi_driver_data(device
) = ec
;
784 acpi_ec_add_fs(device
);
785 pr_info(PREFIX
"GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
786 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
787 pr_info(PREFIX
"driver started in %s mode\n",
788 (test_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
))?"interrupt":"poll");
792 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
795 struct acpi_ec_query_handler
*handler
, *tmp
;
800 ec
= acpi_driver_data(device
);
801 mutex_lock(&ec
->lock
);
802 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
803 list_del(&handler
->node
);
806 mutex_unlock(&ec
->lock
);
807 acpi_ec_remove_fs(device
);
808 acpi_driver_data(device
) = NULL
;
816 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
818 struct acpi_ec
*ec
= context
;
820 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
824 * The first address region returned is the data port, and
825 * the second address region returned is the status/command
828 if (ec
->data_addr
== 0)
829 ec
->data_addr
= resource
->data
.io
.minimum
;
830 else if (ec
->command_addr
== 0)
831 ec
->command_addr
= resource
->data
.io
.minimum
;
833 return AE_CTRL_TERMINATE
;
838 static int ec_install_handlers(struct acpi_ec
*ec
)
841 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
))
843 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
844 ACPI_GPE_EDGE_TRIGGERED
,
845 &acpi_ec_gpe_handler
, ec
);
846 if (ACPI_FAILURE(status
))
848 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
849 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
850 status
= acpi_install_address_space_handler(ec
->handle
,
852 &acpi_ec_space_handler
,
854 if (ACPI_FAILURE(status
)) {
855 acpi_remove_gpe_handler(NULL
, ec
->gpe
, &acpi_ec_gpe_handler
);
859 set_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
863 static int acpi_ec_start(struct acpi_device
*device
)
871 ec
= acpi_driver_data(device
);
876 ret
= ec_install_handlers(ec
);
878 /* EC is fully operational, allow queries */
879 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
883 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
888 ec
= acpi_driver_data(device
);
891 ec_remove_handlers(ec
);
896 int __init
acpi_boot_ec_enable(void)
898 if (!boot_ec
|| test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &boot_ec
->flags
))
900 if (!ec_install_handlers(boot_ec
)) {
907 static const struct acpi_device_id ec_device_ids
[] = {
912 int __init
acpi_ec_ecdt_probe(void)
916 struct acpi_table_ecdt
*ecdt_ptr
;
918 boot_ec
= make_acpi_ec();
922 * Generate a boot ec context
924 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
925 (struct acpi_table_header
**)&ecdt_ptr
);
926 if (ACPI_SUCCESS(status
)) {
927 pr_info(PREFIX
"EC description table is found, configuring boot EC\n");
928 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
929 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
930 if (dmi_check_system(ec_dmi_table
)) {
932 * If the board falls into ec_dmi_table, it means
933 * that ECDT table gives the incorrect command/status
934 * & data I/O address. Just fix it.
936 boot_ec
->data_addr
= ecdt_ptr
->control
.address
;
937 boot_ec
->command_addr
= ecdt_ptr
->data
.address
;
939 boot_ec
->gpe
= ecdt_ptr
->gpe
;
940 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
941 acpi_get_handle(ACPI_ROOT_OBJECT
, ecdt_ptr
->id
, &boot_ec
->handle
);
943 /* This workaround is needed only on some broken machines,
944 * which require early EC, but fail to provide ECDT */
946 printk(KERN_DEBUG PREFIX
"Look up EC in DSDT\n");
947 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
949 /* Check that acpi_get_devices actually find something */
950 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
952 /* We really need to limit this workaround, the only ASUS,
953 * which needs it, has fake EC._INI method, so use it as flag.
954 * Keep boot_ec struct as it will be needed soon.
956 if (ACPI_FAILURE(acpi_get_handle(boot_ec
->handle
, "_INI", &x
)))
960 ret
= ec_install_handlers(boot_ec
);
971 static int acpi_ec_suspend(struct acpi_device
*device
, pm_message_t state
)
973 struct acpi_ec
*ec
= acpi_driver_data(device
);
975 set_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
976 clear_bit(EC_FLAGS_GPE_MODE
, &ec
->flags
);
977 acpi_disable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
981 static int acpi_ec_resume(struct acpi_device
*device
)
983 struct acpi_ec
*ec
= acpi_driver_data(device
);
984 /* Enable use of GPE back */
985 clear_bit(EC_FLAGS_NO_GPE
, &ec
->flags
);
986 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
990 static struct acpi_driver acpi_ec_driver
= {
992 .class = ACPI_EC_CLASS
,
993 .ids
= ec_device_ids
,
996 .remove
= acpi_ec_remove
,
997 .start
= acpi_ec_start
,
998 .stop
= acpi_ec_stop
,
999 .suspend
= acpi_ec_suspend
,
1000 .resume
= acpi_ec_resume
,
1004 static int __init
acpi_ec_init(void)
1011 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
1015 /* Now register the driver for the EC */
1016 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1018 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1025 subsys_initcall(acpi_ec_init
);
1027 /* EC driver currently not unloadable */
1029 static void __exit
acpi_ec_exit(void)
1032 acpi_bus_unregister_driver(&acpi_ec_driver
);
1034 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);