2 * ec.c - ACPI Embedded Controller Driver (v2.2)
4 * Copyright (C) 2001-2014 Intel Corporation
5 * Author: 2014 Lv Zheng <lv.zheng@intel.com>
6 * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
7 * 2006 Denis Sadykov <denis.m.sadykov@intel.com>
8 * 2004 Luming Yu <luming.yu@intel.com>
9 * 2001, 2002 Andy Grover <andrew.grover@intel.com>
10 * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11 * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
13 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or (at
18 * your option) any later version.
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
25 * You should have received a copy of the GNU General Public License along
26 * with this program; if not, write to the Free Software Foundation, Inc.,
27 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
29 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
32 /* Uncomment next line to get verbose printout */
34 #define pr_fmt(fmt) "ACPI : EC: " fmt
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/types.h>
40 #include <linux/delay.h>
41 #include <linux/interrupt.h>
42 #include <linux/list.h>
43 #include <linux/spinlock.h>
44 #include <linux/slab.h>
45 #include <linux/acpi.h>
46 #include <linux/dmi.h>
51 #define ACPI_EC_CLASS "embedded_controller"
52 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
53 #define ACPI_EC_FILE_INFO "info"
55 /* EC status register */
56 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
57 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
58 #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */
59 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
60 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
64 ACPI_EC_COMMAND_READ
= 0x80,
65 ACPI_EC_COMMAND_WRITE
= 0x81,
66 ACPI_EC_BURST_ENABLE
= 0x82,
67 ACPI_EC_BURST_DISABLE
= 0x83,
68 ACPI_EC_COMMAND_QUERY
= 0x84,
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 */
73 #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
74 #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query
75 * when trying to clear the EC */
78 EC_FLAGS_QUERY_PENDING
, /* Query is pending */
79 EC_FLAGS_GPE_STORM
, /* GPE storm detected */
80 EC_FLAGS_HANDLERS_INSTALLED
, /* Handlers for GPE and
81 * OpReg are installed */
82 EC_FLAGS_BLOCKED
, /* Transactions are blocked */
85 #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */
86 #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */
88 /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */
89 static unsigned int ec_delay __read_mostly
= ACPI_EC_DELAY
;
90 module_param(ec_delay
, uint
, 0644);
91 MODULE_PARM_DESC(ec_delay
, "Timeout(ms) waited until an EC command completes");
94 * If the number of false interrupts per one transaction exceeds
95 * this threshold, will think there is a GPE storm happened and
96 * will disable the GPE for normal transaction.
98 static unsigned int ec_storm_threshold __read_mostly
= 8;
99 module_param(ec_storm_threshold
, uint
, 0644);
100 MODULE_PARM_DESC(ec_storm_threshold
, "Maxim false GPE numbers not considered as GPE storm");
102 struct acpi_ec_query_handler
{
103 struct list_head node
;
104 acpi_ec_query_func func
;
114 unsigned short irq_count
;
123 struct acpi_ec
*boot_ec
, *first_ec
;
124 EXPORT_SYMBOL(first_ec
);
126 static int EC_FLAGS_MSI
; /* Out-of-spec MSI controller */
127 static int EC_FLAGS_VALIDATE_ECDT
; /* ASUStec ECDTs need to be validated */
128 static int EC_FLAGS_SKIP_DSDT_SCAN
; /* Not all BIOS survive early DSDT scan */
129 static int EC_FLAGS_CLEAR_ON_RESUME
; /* Needs acpi_ec_clear() on boot/resume */
130 static int EC_FLAGS_QUERY_HANDSHAKE
; /* Needs QR_EC issued when SCI_EVT set */
132 /* --------------------------------------------------------------------------
133 * Transaction Management
134 * -------------------------------------------------------------------------- */
136 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
138 u8 x
= inb(ec
->command_addr
);
140 pr_debug("EC_SC(R) = 0x%2.2x "
141 "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n",
143 !!(x
& ACPI_EC_FLAG_SCI
),
144 !!(x
& ACPI_EC_FLAG_BURST
),
145 !!(x
& ACPI_EC_FLAG_CMD
),
146 !!(x
& ACPI_EC_FLAG_IBF
),
147 !!(x
& ACPI_EC_FLAG_OBF
));
151 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
153 u8 x
= inb(ec
->data_addr
);
155 pr_debug("EC_DATA(R) = 0x%2.2x\n", x
);
159 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
161 pr_debug("EC_SC(W) = 0x%2.2x\n", command
);
162 outb(command
, ec
->command_addr
);
165 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
167 pr_debug("EC_DATA(W) = 0x%2.2x\n", data
);
168 outb(data
, ec
->data_addr
);
172 static const char *acpi_ec_cmd_string(u8 cmd
)
189 #define acpi_ec_cmd_string(cmd) "UNDEF"
192 static int ec_transaction_completed(struct acpi_ec
*ec
)
197 spin_lock_irqsave(&ec
->lock
, flags
);
198 if (ec
->curr
&& (ec
->curr
->flags
& ACPI_EC_COMMAND_COMPLETE
))
200 spin_unlock_irqrestore(&ec
->lock
, flags
);
204 static void advance_transaction(struct acpi_ec
*ec
)
206 struct transaction
*t
;
210 pr_debug("===== %s (%d) =====\n",
211 in_interrupt() ? "IRQ" : "TASK", smp_processor_id());
212 status
= acpi_ec_read_status(ec
);
216 if (t
->flags
& ACPI_EC_COMMAND_POLL
) {
217 if (t
->wlen
> t
->wi
) {
218 if ((status
& ACPI_EC_FLAG_IBF
) == 0)
219 acpi_ec_write_data(ec
, t
->wdata
[t
->wi
++]);
222 } else if (t
->rlen
> t
->ri
) {
223 if ((status
& ACPI_EC_FLAG_OBF
) == 1) {
224 t
->rdata
[t
->ri
++] = acpi_ec_read_data(ec
);
225 if (t
->rlen
== t
->ri
) {
226 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
227 if (t
->command
== ACPI_EC_COMMAND_QUERY
)
228 pr_debug("***** Command(%s) hardware completion *****\n",
229 acpi_ec_cmd_string(t
->command
));
234 } else if (t
->wlen
== t
->wi
&&
235 (status
& ACPI_EC_FLAG_IBF
) == 0) {
236 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
241 if (EC_FLAGS_QUERY_HANDSHAKE
&&
242 !(status
& ACPI_EC_FLAG_SCI
) &&
243 (t
->command
== ACPI_EC_COMMAND_QUERY
)) {
244 t
->flags
|= ACPI_EC_COMMAND_POLL
;
245 t
->rdata
[t
->ri
++] = 0x00;
246 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
247 pr_debug("***** Command(%s) software completion *****\n",
248 acpi_ec_cmd_string(t
->command
));
250 } else if ((status
& ACPI_EC_FLAG_IBF
) == 0) {
251 acpi_ec_write_cmd(ec
, t
->command
);
252 t
->flags
|= ACPI_EC_COMMAND_POLL
;
259 * If SCI bit is set, then don't think it's a false IRQ
260 * otherwise will take a not handled IRQ as a false one.
262 if (!(status
& ACPI_EC_FLAG_SCI
)) {
263 if (in_interrupt() && t
)
267 if (wakeup
&& in_interrupt())
271 static void start_transaction(struct acpi_ec
*ec
)
273 ec
->curr
->irq_count
= ec
->curr
->wi
= ec
->curr
->ri
= 0;
275 advance_transaction(ec
);
278 static int acpi_ec_sync_query(struct acpi_ec
*ec
, u8
*data
);
280 static int ec_check_sci_sync(struct acpi_ec
*ec
, u8 state
)
282 if (state
& ACPI_EC_FLAG_SCI
) {
283 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
284 return acpi_ec_sync_query(ec
, NULL
);
289 static int ec_poll(struct acpi_ec
*ec
)
292 int repeat
= 5; /* number of command restarts */
295 unsigned long delay
= jiffies
+
296 msecs_to_jiffies(ec_delay
);
298 /* don't sleep with disabled interrupts */
299 if (EC_FLAGS_MSI
|| irqs_disabled()) {
300 udelay(ACPI_EC_MSI_UDELAY
);
301 if (ec_transaction_completed(ec
))
304 if (wait_event_timeout(ec
->wait
,
305 ec_transaction_completed(ec
),
306 msecs_to_jiffies(1)))
309 spin_lock_irqsave(&ec
->lock
, flags
);
310 advance_transaction(ec
);
311 spin_unlock_irqrestore(&ec
->lock
, flags
);
312 } while (time_before(jiffies
, delay
));
313 pr_debug("controller reset, restart transaction\n");
314 spin_lock_irqsave(&ec
->lock
, flags
);
315 start_transaction(ec
);
316 spin_unlock_irqrestore(&ec
->lock
, flags
);
321 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
,
322 struct transaction
*t
)
328 udelay(ACPI_EC_MSI_UDELAY
);
329 /* start transaction */
330 spin_lock_irqsave(&ec
->lock
, tmp
);
331 /* following two actions should be kept atomic */
333 pr_debug("***** Command(%s) started *****\n",
334 acpi_ec_cmd_string(t
->command
));
335 start_transaction(ec
);
336 if (ec
->curr
->command
== ACPI_EC_COMMAND_QUERY
) {
337 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
338 pr_debug("***** Event stopped *****\n");
340 spin_unlock_irqrestore(&ec
->lock
, tmp
);
342 spin_lock_irqsave(&ec
->lock
, tmp
);
343 pr_debug("***** Command(%s) stopped *****\n",
344 acpi_ec_cmd_string(t
->command
));
346 spin_unlock_irqrestore(&ec
->lock
, tmp
);
350 static int acpi_ec_transaction(struct acpi_ec
*ec
, struct transaction
*t
)
355 if (!ec
|| (!t
) || (t
->wlen
&& !t
->wdata
) || (t
->rlen
&& !t
->rdata
))
358 memset(t
->rdata
, 0, t
->rlen
);
359 mutex_lock(&ec
->mutex
);
360 if (test_bit(EC_FLAGS_BLOCKED
, &ec
->flags
)) {
364 if (ec
->global_lock
) {
365 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
366 if (ACPI_FAILURE(status
)) {
371 /* disable GPE during transaction if storm is detected */
372 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
373 /* It has to be disabled, so that it doesn't trigger. */
374 acpi_disable_gpe(NULL
, ec
->gpe
);
377 status
= acpi_ec_transaction_unlocked(ec
, t
);
379 /* check if we received SCI during transaction */
380 ec_check_sci_sync(ec
, acpi_ec_read_status(ec
));
381 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
383 /* It is safe to enable the GPE outside of the transaction. */
384 acpi_enable_gpe(NULL
, ec
->gpe
);
385 } else if (t
->irq_count
> ec_storm_threshold
) {
386 pr_info("GPE storm detected(%d GPEs), "
387 "transactions will use polling mode\n",
389 set_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
);
392 acpi_release_global_lock(glk
);
394 mutex_unlock(&ec
->mutex
);
398 static int acpi_ec_burst_enable(struct acpi_ec
*ec
)
401 struct transaction t
= {.command
= ACPI_EC_BURST_ENABLE
,
402 .wdata
= NULL
, .rdata
= &d
,
403 .wlen
= 0, .rlen
= 1};
405 return acpi_ec_transaction(ec
, &t
);
408 static int acpi_ec_burst_disable(struct acpi_ec
*ec
)
410 struct transaction t
= {.command
= ACPI_EC_BURST_DISABLE
,
411 .wdata
= NULL
, .rdata
= NULL
,
412 .wlen
= 0, .rlen
= 0};
414 return (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_BURST
) ?
415 acpi_ec_transaction(ec
, &t
) : 0;
418 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
*data
)
422 struct transaction t
= {.command
= ACPI_EC_COMMAND_READ
,
423 .wdata
= &address
, .rdata
= &d
,
424 .wlen
= 1, .rlen
= 1};
426 result
= acpi_ec_transaction(ec
, &t
);
431 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
433 u8 wdata
[2] = { address
, data
};
434 struct transaction t
= {.command
= ACPI_EC_COMMAND_WRITE
,
435 .wdata
= wdata
, .rdata
= NULL
,
436 .wlen
= 2, .rlen
= 0};
438 return acpi_ec_transaction(ec
, &t
);
441 int ec_read(u8 addr
, u8
*val
)
449 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
457 EXPORT_SYMBOL(ec_read
);
459 int ec_write(u8 addr
, u8 val
)
466 err
= acpi_ec_write(first_ec
, addr
, val
);
470 EXPORT_SYMBOL(ec_write
);
472 int ec_transaction(u8 command
,
473 const u8
*wdata
, unsigned wdata_len
,
474 u8
*rdata
, unsigned rdata_len
)
476 struct transaction t
= {.command
= command
,
477 .wdata
= wdata
, .rdata
= rdata
,
478 .wlen
= wdata_len
, .rlen
= rdata_len
};
483 return acpi_ec_transaction(first_ec
, &t
);
485 EXPORT_SYMBOL(ec_transaction
);
487 /* Get the handle to the EC device */
488 acpi_handle
ec_get_handle(void)
492 return first_ec
->handle
;
494 EXPORT_SYMBOL(ec_get_handle
);
497 * Process _Q events that might have accumulated in the EC.
498 * Run with locked ec mutex.
500 static void acpi_ec_clear(struct acpi_ec
*ec
)
505 for (i
= 0; i
< ACPI_EC_CLEAR_MAX
; i
++) {
506 status
= acpi_ec_sync_query(ec
, &value
);
507 if (status
|| !value
)
511 if (unlikely(i
== ACPI_EC_CLEAR_MAX
))
512 pr_warn("Warning: Maximum of %d stale EC events cleared\n", i
);
514 pr_info("%d stale EC events cleared\n", i
);
517 void acpi_ec_block_transactions(void)
519 struct acpi_ec
*ec
= first_ec
;
524 mutex_lock(&ec
->mutex
);
525 /* Prevent transactions from being carried out */
526 set_bit(EC_FLAGS_BLOCKED
, &ec
->flags
);
527 mutex_unlock(&ec
->mutex
);
530 void acpi_ec_unblock_transactions(void)
532 struct acpi_ec
*ec
= first_ec
;
537 mutex_lock(&ec
->mutex
);
538 /* Allow transactions to be carried out again */
539 clear_bit(EC_FLAGS_BLOCKED
, &ec
->flags
);
541 if (EC_FLAGS_CLEAR_ON_RESUME
)
544 mutex_unlock(&ec
->mutex
);
547 void acpi_ec_unblock_transactions_early(void)
550 * Allow transactions to happen again (this function is called from
551 * atomic context during wakeup, so we don't need to acquire the mutex).
554 clear_bit(EC_FLAGS_BLOCKED
, &first_ec
->flags
);
557 static int acpi_ec_query_unlocked(struct acpi_ec
*ec
, u8
*data
)
561 struct transaction t
= {.command
= ACPI_EC_COMMAND_QUERY
,
562 .wdata
= NULL
, .rdata
= &d
,
563 .wlen
= 0, .rlen
= 1};
568 * Query the EC to find out which _Qxx method we need to evaluate.
569 * Note that successful completion of the query causes the ACPI_EC_SCI
570 * bit to be cleared (and thus clearing the interrupt source).
572 result
= acpi_ec_transaction_unlocked(ec
, &t
);
581 /* --------------------------------------------------------------------------
583 -------------------------------------------------------------------------- */
584 static struct acpi_ec_query_handler
*
585 acpi_ec_get_query_handler(struct acpi_ec_query_handler
*handler
)
588 kref_get(&handler
->kref
);
592 static void acpi_ec_query_handler_release(struct kref
*kref
)
594 struct acpi_ec_query_handler
*handler
=
595 container_of(kref
, struct acpi_ec_query_handler
, kref
);
600 static void acpi_ec_put_query_handler(struct acpi_ec_query_handler
*handler
)
602 kref_put(&handler
->kref
, acpi_ec_query_handler_release
);
605 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
606 acpi_handle handle
, acpi_ec_query_func func
,
609 struct acpi_ec_query_handler
*handler
=
610 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
615 handler
->query_bit
= query_bit
;
616 handler
->handle
= handle
;
617 handler
->func
= func
;
618 handler
->data
= data
;
619 mutex_lock(&ec
->mutex
);
620 kref_init(&handler
->kref
);
621 list_add(&handler
->node
, &ec
->list
);
622 mutex_unlock(&ec
->mutex
);
625 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
627 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
629 struct acpi_ec_query_handler
*handler
, *tmp
;
630 LIST_HEAD(free_list
);
632 mutex_lock(&ec
->mutex
);
633 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
634 if (query_bit
== handler
->query_bit
) {
635 list_del_init(&handler
->node
);
636 list_add(&handler
->node
, &free_list
);
639 mutex_unlock(&ec
->mutex
);
640 list_for_each_entry(handler
, &free_list
, node
)
641 acpi_ec_put_query_handler(handler
);
643 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
645 static void acpi_ec_run(void *cxt
)
647 struct acpi_ec_query_handler
*handler
= cxt
;
651 pr_debug("##### Query(0x%02x) started #####\n", handler
->query_bit
);
653 handler
->func(handler
->data
);
654 else if (handler
->handle
)
655 acpi_evaluate_object(handler
->handle
, NULL
, NULL
, NULL
);
656 pr_debug("##### Query(0x%02x) stopped #####\n", handler
->query_bit
);
657 acpi_ec_put_query_handler(handler
);
660 static int acpi_ec_sync_query(struct acpi_ec
*ec
, u8
*data
)
665 struct acpi_ec_query_handler
*handler
;
667 result
= acpi_ec_query_unlocked(ec
, &value
);
673 list_for_each_entry(handler
, &ec
->list
, node
) {
674 if (value
== handler
->query_bit
) {
675 /* have custom handler for this bit */
676 handler
= acpi_ec_get_query_handler(handler
);
677 pr_debug("##### Query(0x%02x) scheduled #####\n",
679 status
= acpi_os_execute((handler
->func
) ?
680 OSL_NOTIFY_HANDLER
: OSL_GPE_HANDLER
,
681 acpi_ec_run
, handler
);
682 if (ACPI_FAILURE(status
))
690 static void acpi_ec_gpe_query(void *ec_cxt
)
692 struct acpi_ec
*ec
= ec_cxt
;
696 mutex_lock(&ec
->mutex
);
697 acpi_ec_sync_query(ec
, NULL
);
698 mutex_unlock(&ec
->mutex
);
701 static int ec_check_sci(struct acpi_ec
*ec
, u8 state
)
703 if (state
& ACPI_EC_FLAG_SCI
) {
704 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
)) {
705 pr_debug("***** Event started *****\n");
706 return acpi_os_execute(OSL_NOTIFY_HANDLER
,
707 acpi_ec_gpe_query
, ec
);
713 static u32
acpi_ec_gpe_handler(acpi_handle gpe_device
,
714 u32 gpe_number
, void *data
)
717 struct acpi_ec
*ec
= data
;
719 spin_lock_irqsave(&ec
->lock
, flags
);
720 advance_transaction(ec
);
721 spin_unlock_irqrestore(&ec
->lock
, flags
);
722 ec_check_sci(ec
, acpi_ec_read_status(ec
));
723 return ACPI_INTERRUPT_HANDLED
| ACPI_REENABLE_GPE
;
726 /* --------------------------------------------------------------------------
727 * Address Space Management
728 * -------------------------------------------------------------------------- */
731 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
732 u32 bits
, u64
*value64
,
733 void *handler_context
, void *region_context
)
735 struct acpi_ec
*ec
= handler_context
;
736 int result
= 0, i
, bytes
= bits
/ 8;
737 u8
*value
= (u8
*)value64
;
739 if ((address
> 0xFF) || !value
|| !handler_context
)
740 return AE_BAD_PARAMETER
;
742 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
743 return AE_BAD_PARAMETER
;
745 if (EC_FLAGS_MSI
|| bits
> 8)
746 acpi_ec_burst_enable(ec
);
748 for (i
= 0; i
< bytes
; ++i
, ++address
, ++value
)
749 result
= (function
== ACPI_READ
) ?
750 acpi_ec_read(ec
, address
, value
) :
751 acpi_ec_write(ec
, address
, *value
);
753 if (EC_FLAGS_MSI
|| bits
> 8)
754 acpi_ec_burst_disable(ec
);
758 return AE_BAD_PARAMETER
;
768 /* --------------------------------------------------------------------------
770 * -------------------------------------------------------------------------- */
773 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
775 static struct acpi_ec
*make_acpi_ec(void)
777 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
781 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
782 mutex_init(&ec
->mutex
);
783 init_waitqueue_head(&ec
->wait
);
784 INIT_LIST_HEAD(&ec
->list
);
785 spin_lock_init(&ec
->lock
);
790 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
791 void *context
, void **return_value
)
794 struct acpi_buffer buffer
= { sizeof(node_name
), node_name
};
795 struct acpi_ec
*ec
= context
;
799 status
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
801 if (ACPI_SUCCESS(status
) && sscanf(node_name
, "_Q%x", &value
) == 1)
802 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
807 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
810 unsigned long long tmp
= 0;
811 struct acpi_ec
*ec
= context
;
813 /* clear addr values, ec_parse_io_ports depend on it */
814 ec
->command_addr
= ec
->data_addr
= 0;
816 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
817 ec_parse_io_ports
, ec
);
818 if (ACPI_FAILURE(status
))
821 /* Get GPE bit assignment (EC events). */
822 /* TODO: Add support for _GPE returning a package */
823 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &tmp
);
824 if (ACPI_FAILURE(status
))
827 /* Use the global lock for all EC transactions? */
829 acpi_evaluate_integer(handle
, "_GLK", NULL
, &tmp
);
830 ec
->global_lock
= tmp
;
832 return AE_CTRL_TERMINATE
;
835 static int ec_install_handlers(struct acpi_ec
*ec
)
839 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
))
841 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
842 ACPI_GPE_EDGE_TRIGGERED
,
843 &acpi_ec_gpe_handler
, ec
);
844 if (ACPI_FAILURE(status
))
847 acpi_enable_gpe(NULL
, ec
->gpe
);
848 status
= acpi_install_address_space_handler(ec
->handle
,
850 &acpi_ec_space_handler
,
852 if (ACPI_FAILURE(status
)) {
853 if (status
== AE_NOT_FOUND
) {
855 * Maybe OS fails in evaluating the _REG object.
856 * The AE_NOT_FOUND error will be ignored and OS
857 * continue to initialize EC.
859 pr_err("Fail in evaluating the _REG object"
860 " of EC device. Broken bios is suspected.\n");
862 acpi_disable_gpe(NULL
, ec
->gpe
);
863 acpi_remove_gpe_handler(NULL
, ec
->gpe
,
864 &acpi_ec_gpe_handler
);
869 set_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
873 static void ec_remove_handlers(struct acpi_ec
*ec
)
875 if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
))
877 acpi_disable_gpe(NULL
, ec
->gpe
);
878 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
879 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
880 pr_err("failed to remove space handler\n");
881 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
882 &acpi_ec_gpe_handler
)))
883 pr_err("failed to remove gpe handler\n");
884 clear_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
887 static int acpi_ec_add(struct acpi_device
*device
)
889 struct acpi_ec
*ec
= NULL
;
892 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
893 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
895 /* Check for boot EC */
897 (boot_ec
->handle
== device
->handle
||
898 boot_ec
->handle
== ACPI_ROOT_OBJECT
)) {
906 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
912 /* Find and register all query methods */
913 acpi_walk_namespace(ACPI_TYPE_METHOD
, ec
->handle
, 1,
914 acpi_ec_register_query_methods
, NULL
, ec
, NULL
);
918 device
->driver_data
= ec
;
920 ret
= !!request_region(ec
->data_addr
, 1, "EC data");
921 WARN(!ret
, "Could not request EC data io port 0x%lx", ec
->data_addr
);
922 ret
= !!request_region(ec
->command_addr
, 1, "EC cmd");
923 WARN(!ret
, "Could not request EC cmd io port 0x%lx", ec
->command_addr
);
925 pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
926 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
928 ret
= ec_install_handlers(ec
);
930 /* EC is fully operational, allow queries */
931 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
933 /* Clear stale _Q events if hardware might require that */
934 if (EC_FLAGS_CLEAR_ON_RESUME
) {
935 mutex_lock(&ec
->mutex
);
937 mutex_unlock(&ec
->mutex
);
942 static int acpi_ec_remove(struct acpi_device
*device
)
945 struct acpi_ec_query_handler
*handler
, *tmp
;
950 ec
= acpi_driver_data(device
);
951 ec_remove_handlers(ec
);
952 mutex_lock(&ec
->mutex
);
953 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
954 list_del(&handler
->node
);
957 mutex_unlock(&ec
->mutex
);
958 release_region(ec
->data_addr
, 1);
959 release_region(ec
->command_addr
, 1);
960 device
->driver_data
= NULL
;
968 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
970 struct acpi_ec
*ec
= context
;
972 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
976 * The first address region returned is the data port, and
977 * the second address region returned is the status/command
980 if (ec
->data_addr
== 0)
981 ec
->data_addr
= resource
->data
.io
.minimum
;
982 else if (ec
->command_addr
== 0)
983 ec
->command_addr
= resource
->data
.io
.minimum
;
985 return AE_CTRL_TERMINATE
;
990 int __init
acpi_boot_ec_enable(void)
992 if (!boot_ec
|| test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &boot_ec
->flags
))
994 if (!ec_install_handlers(boot_ec
)) {
1001 static const struct acpi_device_id ec_device_ids
[] = {
1006 /* Some BIOS do not survive early DSDT scan, skip it */
1007 static int ec_skip_dsdt_scan(const struct dmi_system_id
*id
)
1009 EC_FLAGS_SKIP_DSDT_SCAN
= 1;
1013 /* ASUStek often supplies us with broken ECDT, validate it */
1014 static int ec_validate_ecdt(const struct dmi_system_id
*id
)
1016 EC_FLAGS_VALIDATE_ECDT
= 1;
1020 /* MSI EC needs special treatment, enable it */
1021 static int ec_flag_msi(const struct dmi_system_id
*id
)
1023 pr_debug("Detected MSI hardware, enabling workarounds.\n");
1025 EC_FLAGS_VALIDATE_ECDT
= 1;
1030 * Clevo M720 notebook actually works ok with IRQ mode, if we lifted
1031 * the GPE storm threshold back to 20
1033 static int ec_enlarge_storm_threshold(const struct dmi_system_id
*id
)
1035 pr_debug("Setting the EC GPE storm threshold to 20\n");
1036 ec_storm_threshold
= 20;
1041 * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for
1042 * which case, we complete the QR_EC without issuing it to the firmware.
1043 * https://bugzilla.kernel.org/show_bug.cgi?id=86211
1045 static int ec_flag_query_handshake(const struct dmi_system_id
*id
)
1047 pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n");
1048 EC_FLAGS_QUERY_HANDSHAKE
= 1;
1053 * On some hardware it is necessary to clear events accumulated by the EC during
1054 * sleep. These ECs stop reporting GPEs until they are manually polled, if too
1055 * many events are accumulated. (e.g. Samsung Series 5/9 notebooks)
1057 * https://bugzilla.kernel.org/show_bug.cgi?id=44161
1059 * Ideally, the EC should also be instructed NOT to accumulate events during
1060 * sleep (which Windows seems to do somehow), but the interface to control this
1061 * behaviour is not known at this time.
1063 * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx,
1064 * however it is very likely that other Samsung models are affected.
1066 * On systems which don't accumulate _Q events during sleep, this extra check
1067 * should be harmless.
1069 static int ec_clear_on_resume(const struct dmi_system_id
*id
)
1071 pr_debug("Detected system needing EC poll on resume.\n");
1072 EC_FLAGS_CLEAR_ON_RESUME
= 1;
1076 static struct dmi_system_id ec_dmi_table
[] __initdata
= {
1078 ec_skip_dsdt_scan
, "Compal JFL92", {
1079 DMI_MATCH(DMI_BIOS_VENDOR
, "COMPAL"),
1080 DMI_MATCH(DMI_BOARD_NAME
, "JFL92") }, NULL
},
1082 ec_flag_msi
, "MSI hardware", {
1083 DMI_MATCH(DMI_BIOS_VENDOR
, "Micro-Star")}, NULL
},
1085 ec_flag_msi
, "MSI hardware", {
1086 DMI_MATCH(DMI_SYS_VENDOR
, "Micro-Star")}, NULL
},
1088 ec_flag_msi
, "MSI hardware", {
1089 DMI_MATCH(DMI_CHASSIS_VENDOR
, "MICRO-Star")}, NULL
},
1091 ec_flag_msi
, "MSI hardware", {
1092 DMI_MATCH(DMI_CHASSIS_VENDOR
, "MICRO-STAR")}, NULL
},
1094 ec_flag_msi
, "Quanta hardware", {
1095 DMI_MATCH(DMI_SYS_VENDOR
, "Quanta"),
1096 DMI_MATCH(DMI_PRODUCT_NAME
, "TW8/SW8/DW8"),}, NULL
},
1098 ec_flag_msi
, "Quanta hardware", {
1099 DMI_MATCH(DMI_SYS_VENDOR
, "Quanta"),
1100 DMI_MATCH(DMI_PRODUCT_NAME
, "TW9/SW9"),}, NULL
},
1102 ec_flag_msi
, "Clevo W350etq", {
1103 DMI_MATCH(DMI_SYS_VENDOR
, "CLEVO CO."),
1104 DMI_MATCH(DMI_PRODUCT_NAME
, "W35_37ET"),}, NULL
},
1106 ec_validate_ecdt
, "ASUS hardware", {
1107 DMI_MATCH(DMI_BIOS_VENDOR
, "ASUS") }, NULL
},
1109 ec_validate_ecdt
, "ASUS hardware", {
1110 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer Inc.") }, NULL
},
1112 ec_enlarge_storm_threshold
, "CLEVO hardware", {
1113 DMI_MATCH(DMI_SYS_VENDOR
, "CLEVO Co."),
1114 DMI_MATCH(DMI_PRODUCT_NAME
, "M720T/M730T"),}, NULL
},
1116 ec_skip_dsdt_scan
, "HP Folio 13", {
1117 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1118 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Folio 13"),}, NULL
},
1120 ec_validate_ecdt
, "ASUS hardware", {
1121 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTek Computer Inc."),
1122 DMI_MATCH(DMI_PRODUCT_NAME
, "L4R"),}, NULL
},
1124 ec_clear_on_resume
, "Samsung hardware", {
1125 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL
},
1127 ec_flag_query_handshake
, "Acer hardware", {
1128 DMI_MATCH(DMI_SYS_VENDOR
, "Acer"), }, NULL
},
1132 int __init
acpi_ec_ecdt_probe(void)
1135 struct acpi_ec
*saved_ec
= NULL
;
1136 struct acpi_table_ecdt
*ecdt_ptr
;
1138 boot_ec
= make_acpi_ec();
1142 * Generate a boot ec context
1144 dmi_check_system(ec_dmi_table
);
1145 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
1146 (struct acpi_table_header
**)&ecdt_ptr
);
1147 if (ACPI_SUCCESS(status
)) {
1148 pr_info("EC description table is found, configuring boot EC\n");
1149 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
1150 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
1151 boot_ec
->gpe
= ecdt_ptr
->gpe
;
1152 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
1153 acpi_get_handle(ACPI_ROOT_OBJECT
, ecdt_ptr
->id
,
1155 /* Don't trust ECDT, which comes from ASUSTek */
1156 if (!EC_FLAGS_VALIDATE_ECDT
)
1158 saved_ec
= kmemdup(boot_ec
, sizeof(struct acpi_ec
), GFP_KERNEL
);
1164 if (EC_FLAGS_SKIP_DSDT_SCAN
) {
1169 /* This workaround is needed only on some broken machines,
1170 * which require early EC, but fail to provide ECDT */
1171 pr_debug("Look up EC in DSDT\n");
1172 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
1174 /* Check that acpi_get_devices actually find something */
1175 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
1178 /* try to find good ECDT from ASUSTek */
1179 if (saved_ec
->command_addr
!= boot_ec
->command_addr
||
1180 saved_ec
->data_addr
!= boot_ec
->data_addr
||
1181 saved_ec
->gpe
!= boot_ec
->gpe
||
1182 saved_ec
->handle
!= boot_ec
->handle
)
1183 pr_info("ASUSTek keeps feeding us with broken "
1184 "ECDT tables, which are very hard to workaround. "
1185 "Trying to use DSDT EC info instead. Please send "
1186 "output of acpidump to linux-acpi@vger.kernel.org\n");
1190 /* We really need to limit this workaround, the only ASUS,
1191 * which needs it, has fake EC._INI method, so use it as flag.
1192 * Keep boot_ec struct as it will be needed soon.
1194 if (!dmi_name_in_vendors("ASUS") ||
1195 !acpi_has_method(boot_ec
->handle
, "_INI"))
1199 if (!ec_install_handlers(boot_ec
)) {
1210 static struct acpi_driver acpi_ec_driver
= {
1212 .class = ACPI_EC_CLASS
,
1213 .ids
= ec_device_ids
,
1216 .remove
= acpi_ec_remove
,
1220 int __init
acpi_ec_init(void)
1224 /* Now register the driver for the EC */
1225 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1232 /* EC driver currently not unloadable */
1234 static void __exit
acpi_ec_exit(void)
1237 acpi_bus_unregister_driver(&acpi_ec_driver
);