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
;
113 unsigned short irq_count
;
122 struct acpi_ec
*boot_ec
, *first_ec
;
123 EXPORT_SYMBOL(first_ec
);
125 static int EC_FLAGS_MSI
; /* Out-of-spec MSI controller */
126 static int EC_FLAGS_VALIDATE_ECDT
; /* ASUStec ECDTs need to be validated */
127 static int EC_FLAGS_SKIP_DSDT_SCAN
; /* Not all BIOS survive early DSDT scan */
128 static int EC_FLAGS_CLEAR_ON_RESUME
; /* Needs acpi_ec_clear() on boot/resume */
130 /* --------------------------------------------------------------------------
131 Transaction Management
132 -------------------------------------------------------------------------- */
134 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
136 u8 x
= inb(ec
->command_addr
);
137 pr_debug("EC_SC(R) = 0x%2.2x "
138 "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n",
140 !!(x
& ACPI_EC_FLAG_SCI
),
141 !!(x
& ACPI_EC_FLAG_BURST
),
142 !!(x
& ACPI_EC_FLAG_CMD
),
143 !!(x
& ACPI_EC_FLAG_IBF
),
144 !!(x
& ACPI_EC_FLAG_OBF
));
148 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
150 u8 x
= inb(ec
->data_addr
);
151 pr_debug("EC_DATA(R) = 0x%2.2x\n", x
);
155 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
157 pr_debug("EC_SC(W) = 0x%2.2x\n", command
);
158 outb(command
, ec
->command_addr
);
161 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
163 pr_debug("EC_DATA(W) = 0x%2.2x\n", data
);
164 outb(data
, ec
->data_addr
);
167 static int ec_transaction_completed(struct acpi_ec
*ec
)
171 spin_lock_irqsave(&ec
->lock
, flags
);
172 if (ec
->curr
&& (ec
->curr
->flags
& ACPI_EC_COMMAND_COMPLETE
))
174 spin_unlock_irqrestore(&ec
->lock
, flags
);
178 static bool advance_transaction(struct acpi_ec
*ec
)
180 struct transaction
*t
;
184 pr_debug("===== %s =====\n", in_interrupt() ? "IRQ" : "TASK");
185 status
= acpi_ec_read_status(ec
);
189 if (t
->flags
& ACPI_EC_COMMAND_POLL
) {
190 if (t
->wlen
> t
->wi
) {
191 if ((status
& ACPI_EC_FLAG_IBF
) == 0)
192 acpi_ec_write_data(ec
, t
->wdata
[t
->wi
++]);
195 } else if (t
->rlen
> t
->ri
) {
196 if ((status
& ACPI_EC_FLAG_OBF
) == 1) {
197 t
->rdata
[t
->ri
++] = acpi_ec_read_data(ec
);
198 if (t
->rlen
== t
->ri
) {
199 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
200 if (t
->command
== ACPI_EC_COMMAND_QUERY
)
201 pr_debug("hardware QR_EC completion\n");
206 } else if (t
->wlen
== t
->wi
&&
207 (status
& ACPI_EC_FLAG_IBF
) == 0) {
208 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
214 * There is firmware refusing to respond QR_EC when SCI_EVT
215 * is not set, for which case, we complete the QR_EC
216 * without issuing it to the firmware.
217 * https://bugzilla.kernel.org/show_bug.cgi?id=86211
219 if (!(status
& ACPI_EC_FLAG_SCI
) &&
220 (t
->command
== ACPI_EC_COMMAND_QUERY
)) {
221 t
->flags
|= ACPI_EC_COMMAND_POLL
;
222 t
->rdata
[t
->ri
++] = 0x00;
223 t
->flags
|= ACPI_EC_COMMAND_COMPLETE
;
224 pr_debug("software QR_EC completion\n");
226 } else if ((status
& ACPI_EC_FLAG_IBF
) == 0) {
227 acpi_ec_write_cmd(ec
, t
->command
);
228 t
->flags
|= ACPI_EC_COMMAND_POLL
;
235 * If SCI bit is set, then don't think it's a false IRQ
236 * otherwise will take a not handled IRQ as a false one.
238 if (!(status
& ACPI_EC_FLAG_SCI
)) {
239 if (in_interrupt() && t
)
245 static void start_transaction(struct acpi_ec
*ec
)
247 ec
->curr
->irq_count
= ec
->curr
->wi
= ec
->curr
->ri
= 0;
249 (void)advance_transaction(ec
);
252 static int acpi_ec_sync_query(struct acpi_ec
*ec
, u8
*data
);
254 static int ec_check_sci_sync(struct acpi_ec
*ec
, u8 state
)
256 if (state
& ACPI_EC_FLAG_SCI
) {
257 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
))
258 return acpi_ec_sync_query(ec
, NULL
);
263 static int ec_poll(struct acpi_ec
*ec
)
266 int repeat
= 5; /* number of command restarts */
268 unsigned long delay
= jiffies
+
269 msecs_to_jiffies(ec_delay
);
271 /* don't sleep with disabled interrupts */
272 if (EC_FLAGS_MSI
|| irqs_disabled()) {
273 udelay(ACPI_EC_MSI_UDELAY
);
274 if (ec_transaction_completed(ec
))
277 if (wait_event_timeout(ec
->wait
,
278 ec_transaction_completed(ec
),
279 msecs_to_jiffies(1)))
282 spin_lock_irqsave(&ec
->lock
, flags
);
283 (void)advance_transaction(ec
);
284 spin_unlock_irqrestore(&ec
->lock
, flags
);
285 } while (time_before(jiffies
, delay
));
286 pr_debug("controller reset, restart transaction\n");
287 spin_lock_irqsave(&ec
->lock
, flags
);
288 start_transaction(ec
);
289 spin_unlock_irqrestore(&ec
->lock
, flags
);
294 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
,
295 struct transaction
*t
)
300 udelay(ACPI_EC_MSI_UDELAY
);
301 /* start transaction */
302 spin_lock_irqsave(&ec
->lock
, tmp
);
303 /* following two actions should be kept atomic */
305 start_transaction(ec
);
306 spin_unlock_irqrestore(&ec
->lock
, tmp
);
308 spin_lock_irqsave(&ec
->lock
, tmp
);
309 if (ec
->curr
->command
== ACPI_EC_COMMAND_QUERY
)
310 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
312 spin_unlock_irqrestore(&ec
->lock
, tmp
);
316 static int acpi_ec_transaction(struct acpi_ec
*ec
, struct transaction
*t
)
320 if (!ec
|| (!t
) || (t
->wlen
&& !t
->wdata
) || (t
->rlen
&& !t
->rdata
))
323 memset(t
->rdata
, 0, t
->rlen
);
324 mutex_lock(&ec
->mutex
);
325 if (test_bit(EC_FLAGS_BLOCKED
, &ec
->flags
)) {
329 if (ec
->global_lock
) {
330 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
331 if (ACPI_FAILURE(status
)) {
336 pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n",
337 t
->command
, t
->wdata
? t
->wdata
[0] : 0);
338 /* disable GPE during transaction if storm is detected */
339 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
340 /* It has to be disabled, so that it doesn't trigger. */
341 acpi_disable_gpe(NULL
, ec
->gpe
);
344 status
= acpi_ec_transaction_unlocked(ec
, t
);
346 /* check if we received SCI during transaction */
347 ec_check_sci_sync(ec
, acpi_ec_read_status(ec
));
348 if (test_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
)) {
350 /* It is safe to enable the GPE outside of the transaction. */
351 acpi_enable_gpe(NULL
, ec
->gpe
);
352 } else if (t
->irq_count
> ec_storm_threshold
) {
353 pr_info("GPE storm detected(%d GPEs), "
354 "transactions will use polling mode\n",
356 set_bit(EC_FLAGS_GPE_STORM
, &ec
->flags
);
358 pr_debug("transaction end\n");
360 acpi_release_global_lock(glk
);
362 mutex_unlock(&ec
->mutex
);
366 static int acpi_ec_burst_enable(struct acpi_ec
*ec
)
369 struct transaction t
= {.command
= ACPI_EC_BURST_ENABLE
,
370 .wdata
= NULL
, .rdata
= &d
,
371 .wlen
= 0, .rlen
= 1};
373 return acpi_ec_transaction(ec
, &t
);
376 static int acpi_ec_burst_disable(struct acpi_ec
*ec
)
378 struct transaction t
= {.command
= ACPI_EC_BURST_DISABLE
,
379 .wdata
= NULL
, .rdata
= NULL
,
380 .wlen
= 0, .rlen
= 0};
382 return (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_BURST
) ?
383 acpi_ec_transaction(ec
, &t
) : 0;
386 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
* data
)
390 struct transaction t
= {.command
= ACPI_EC_COMMAND_READ
,
391 .wdata
= &address
, .rdata
= &d
,
392 .wlen
= 1, .rlen
= 1};
394 result
= acpi_ec_transaction(ec
, &t
);
399 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
401 u8 wdata
[2] = { address
, data
};
402 struct transaction t
= {.command
= ACPI_EC_COMMAND_WRITE
,
403 .wdata
= wdata
, .rdata
= NULL
,
404 .wlen
= 2, .rlen
= 0};
406 return acpi_ec_transaction(ec
, &t
);
409 int ec_read(u8 addr
, u8
*val
)
417 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
426 EXPORT_SYMBOL(ec_read
);
428 int ec_write(u8 addr
, u8 val
)
435 err
= acpi_ec_write(first_ec
, addr
, val
);
440 EXPORT_SYMBOL(ec_write
);
442 int ec_transaction(u8 command
,
443 const u8
* wdata
, unsigned wdata_len
,
444 u8
* rdata
, unsigned rdata_len
)
446 struct transaction t
= {.command
= command
,
447 .wdata
= wdata
, .rdata
= rdata
,
448 .wlen
= wdata_len
, .rlen
= rdata_len
};
452 return acpi_ec_transaction(first_ec
, &t
);
455 EXPORT_SYMBOL(ec_transaction
);
457 /* Get the handle to the EC device */
458 acpi_handle
ec_get_handle(void)
462 return first_ec
->handle
;
465 EXPORT_SYMBOL(ec_get_handle
);
468 * Process _Q events that might have accumulated in the EC.
469 * Run with locked ec mutex.
471 static void acpi_ec_clear(struct acpi_ec
*ec
)
476 for (i
= 0; i
< ACPI_EC_CLEAR_MAX
; i
++) {
477 status
= acpi_ec_sync_query(ec
, &value
);
478 if (status
|| !value
)
482 if (unlikely(i
== ACPI_EC_CLEAR_MAX
))
483 pr_warn("Warning: Maximum of %d stale EC events cleared\n", i
);
485 pr_info("%d stale EC events cleared\n", i
);
488 void acpi_ec_block_transactions(void)
490 struct acpi_ec
*ec
= first_ec
;
495 mutex_lock(&ec
->mutex
);
496 /* Prevent transactions from being carried out */
497 set_bit(EC_FLAGS_BLOCKED
, &ec
->flags
);
498 mutex_unlock(&ec
->mutex
);
501 void acpi_ec_unblock_transactions(void)
503 struct acpi_ec
*ec
= first_ec
;
508 mutex_lock(&ec
->mutex
);
509 /* Allow transactions to be carried out again */
510 clear_bit(EC_FLAGS_BLOCKED
, &ec
->flags
);
512 if (EC_FLAGS_CLEAR_ON_RESUME
)
515 mutex_unlock(&ec
->mutex
);
518 void acpi_ec_unblock_transactions_early(void)
521 * Allow transactions to happen again (this function is called from
522 * atomic context during wakeup, so we don't need to acquire the mutex).
525 clear_bit(EC_FLAGS_BLOCKED
, &first_ec
->flags
);
528 static int acpi_ec_query_unlocked(struct acpi_ec
*ec
, u8
* data
)
532 struct transaction t
= {.command
= ACPI_EC_COMMAND_QUERY
,
533 .wdata
= NULL
, .rdata
= &d
,
534 .wlen
= 0, .rlen
= 1};
538 * Query the EC to find out which _Qxx method we need to evaluate.
539 * Note that successful completion of the query causes the ACPI_EC_SCI
540 * bit to be cleared (and thus clearing the interrupt source).
542 result
= acpi_ec_transaction_unlocked(ec
, &t
);
551 /* --------------------------------------------------------------------------
553 -------------------------------------------------------------------------- */
554 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
555 acpi_handle handle
, acpi_ec_query_func func
,
558 struct acpi_ec_query_handler
*handler
=
559 kzalloc(sizeof(struct acpi_ec_query_handler
), GFP_KERNEL
);
563 handler
->query_bit
= query_bit
;
564 handler
->handle
= handle
;
565 handler
->func
= func
;
566 handler
->data
= data
;
567 mutex_lock(&ec
->mutex
);
568 list_add(&handler
->node
, &ec
->list
);
569 mutex_unlock(&ec
->mutex
);
573 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
575 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
577 struct acpi_ec_query_handler
*handler
, *tmp
;
578 mutex_lock(&ec
->mutex
);
579 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
580 if (query_bit
== handler
->query_bit
) {
581 list_del(&handler
->node
);
585 mutex_unlock(&ec
->mutex
);
588 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
590 static void acpi_ec_run(void *cxt
)
592 struct acpi_ec_query_handler
*handler
= cxt
;
595 pr_debug("start query execution\n");
597 handler
->func(handler
->data
);
598 else if (handler
->handle
)
599 acpi_evaluate_object(handler
->handle
, NULL
, NULL
, NULL
);
600 pr_debug("stop query execution\n");
604 static int acpi_ec_sync_query(struct acpi_ec
*ec
, u8
*data
)
608 struct acpi_ec_query_handler
*handler
, *copy
;
610 status
= acpi_ec_query_unlocked(ec
, &value
);
616 list_for_each_entry(handler
, &ec
->list
, node
) {
617 if (value
== handler
->query_bit
) {
618 /* have custom handler for this bit */
619 copy
= kmalloc(sizeof(*handler
), GFP_KERNEL
);
622 memcpy(copy
, handler
, sizeof(*copy
));
623 pr_debug("push query execution (0x%2x) on queue\n",
625 return acpi_os_execute((copy
->func
) ?
626 OSL_NOTIFY_HANDLER
: OSL_GPE_HANDLER
,
633 static void acpi_ec_gpe_query(void *ec_cxt
)
635 struct acpi_ec
*ec
= ec_cxt
;
638 mutex_lock(&ec
->mutex
);
639 acpi_ec_sync_query(ec
, NULL
);
640 mutex_unlock(&ec
->mutex
);
643 static int ec_check_sci(struct acpi_ec
*ec
, u8 state
)
645 if (state
& ACPI_EC_FLAG_SCI
) {
646 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
)) {
647 pr_debug("push gpe query to the queue\n");
648 return acpi_os_execute(OSL_NOTIFY_HANDLER
,
649 acpi_ec_gpe_query
, ec
);
655 static u32
acpi_ec_gpe_handler(acpi_handle gpe_device
,
656 u32 gpe_number
, void *data
)
659 struct acpi_ec
*ec
= data
;
661 spin_lock_irqsave(&ec
->lock
, flags
);
662 if (advance_transaction(ec
))
664 spin_unlock_irqrestore(&ec
->lock
, flags
);
665 ec_check_sci(ec
, acpi_ec_read_status(ec
));
666 return ACPI_INTERRUPT_HANDLED
| ACPI_REENABLE_GPE
;
669 /* --------------------------------------------------------------------------
670 Address Space Management
671 -------------------------------------------------------------------------- */
674 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
675 u32 bits
, u64
*value64
,
676 void *handler_context
, void *region_context
)
678 struct acpi_ec
*ec
= handler_context
;
679 int result
= 0, i
, bytes
= bits
/ 8;
680 u8
*value
= (u8
*)value64
;
682 if ((address
> 0xFF) || !value
|| !handler_context
)
683 return AE_BAD_PARAMETER
;
685 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
686 return AE_BAD_PARAMETER
;
688 if (EC_FLAGS_MSI
|| bits
> 8)
689 acpi_ec_burst_enable(ec
);
691 for (i
= 0; i
< bytes
; ++i
, ++address
, ++value
)
692 result
= (function
== ACPI_READ
) ?
693 acpi_ec_read(ec
, address
, value
) :
694 acpi_ec_write(ec
, address
, *value
);
696 if (EC_FLAGS_MSI
|| bits
> 8)
697 acpi_ec_burst_disable(ec
);
701 return AE_BAD_PARAMETER
;
714 /* --------------------------------------------------------------------------
716 -------------------------------------------------------------------------- */
718 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
720 static struct acpi_ec
*make_acpi_ec(void)
722 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
725 ec
->flags
= 1 << EC_FLAGS_QUERY_PENDING
;
726 mutex_init(&ec
->mutex
);
727 init_waitqueue_head(&ec
->wait
);
728 INIT_LIST_HEAD(&ec
->list
);
729 spin_lock_init(&ec
->lock
);
734 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
735 void *context
, void **return_value
)
738 struct acpi_buffer buffer
= { sizeof(node_name
), node_name
};
739 struct acpi_ec
*ec
= context
;
743 status
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
745 if (ACPI_SUCCESS(status
) && sscanf(node_name
, "_Q%x", &value
) == 1) {
746 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
752 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
755 unsigned long long tmp
= 0;
757 struct acpi_ec
*ec
= context
;
759 /* clear addr values, ec_parse_io_ports depend on it */
760 ec
->command_addr
= ec
->data_addr
= 0;
762 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
763 ec_parse_io_ports
, ec
);
764 if (ACPI_FAILURE(status
))
767 /* Get GPE bit assignment (EC events). */
768 /* TODO: Add support for _GPE returning a package */
769 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &tmp
);
770 if (ACPI_FAILURE(status
))
773 /* Use the global lock for all EC transactions? */
775 acpi_evaluate_integer(handle
, "_GLK", NULL
, &tmp
);
776 ec
->global_lock
= tmp
;
778 return AE_CTRL_TERMINATE
;
781 static int ec_install_handlers(struct acpi_ec
*ec
)
784 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
))
786 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
787 ACPI_GPE_EDGE_TRIGGERED
,
788 &acpi_ec_gpe_handler
, ec
);
789 if (ACPI_FAILURE(status
))
792 acpi_enable_gpe(NULL
, ec
->gpe
);
793 status
= acpi_install_address_space_handler(ec
->handle
,
795 &acpi_ec_space_handler
,
797 if (ACPI_FAILURE(status
)) {
798 if (status
== AE_NOT_FOUND
) {
800 * Maybe OS fails in evaluating the _REG object.
801 * The AE_NOT_FOUND error will be ignored and OS
802 * continue to initialize EC.
804 pr_err("Fail in evaluating the _REG object"
805 " of EC device. Broken bios is suspected.\n");
807 acpi_disable_gpe(NULL
, ec
->gpe
);
808 acpi_remove_gpe_handler(NULL
, ec
->gpe
,
809 &acpi_ec_gpe_handler
);
814 set_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
818 static void ec_remove_handlers(struct acpi_ec
*ec
)
820 acpi_disable_gpe(NULL
, ec
->gpe
);
821 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec
->handle
,
822 ACPI_ADR_SPACE_EC
, &acpi_ec_space_handler
)))
823 pr_err("failed to remove space handler\n");
824 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
825 &acpi_ec_gpe_handler
)))
826 pr_err("failed to remove gpe handler\n");
827 clear_bit(EC_FLAGS_HANDLERS_INSTALLED
, &ec
->flags
);
830 static int acpi_ec_add(struct acpi_device
*device
)
832 struct acpi_ec
*ec
= NULL
;
835 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
836 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
838 /* Check for boot EC */
840 (boot_ec
->handle
== device
->handle
||
841 boot_ec
->handle
== ACPI_ROOT_OBJECT
)) {
849 if (ec_parse_device(device
->handle
, 0, ec
, NULL
) !=
855 /* Find and register all query methods */
856 acpi_walk_namespace(ACPI_TYPE_METHOD
, ec
->handle
, 1,
857 acpi_ec_register_query_methods
, NULL
, ec
, NULL
);
861 device
->driver_data
= ec
;
863 ret
= !!request_region(ec
->data_addr
, 1, "EC data");
864 WARN(!ret
, "Could not request EC data io port 0x%lx", ec
->data_addr
);
865 ret
= !!request_region(ec
->command_addr
, 1, "EC cmd");
866 WARN(!ret
, "Could not request EC cmd io port 0x%lx", ec
->command_addr
);
868 pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
869 ec
->gpe
, ec
->command_addr
, ec
->data_addr
);
871 ret
= ec_install_handlers(ec
);
873 /* EC is fully operational, allow queries */
874 clear_bit(EC_FLAGS_QUERY_PENDING
, &ec
->flags
);
876 /* Clear stale _Q events if hardware might require that */
877 if (EC_FLAGS_CLEAR_ON_RESUME
) {
878 mutex_lock(&ec
->mutex
);
880 mutex_unlock(&ec
->mutex
);
885 static int acpi_ec_remove(struct acpi_device
*device
)
888 struct acpi_ec_query_handler
*handler
, *tmp
;
893 ec
= acpi_driver_data(device
);
894 ec_remove_handlers(ec
);
895 mutex_lock(&ec
->mutex
);
896 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
897 list_del(&handler
->node
);
900 mutex_unlock(&ec
->mutex
);
901 release_region(ec
->data_addr
, 1);
902 release_region(ec
->command_addr
, 1);
903 device
->driver_data
= NULL
;
911 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
913 struct acpi_ec
*ec
= context
;
915 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
919 * The first address region returned is the data port, and
920 * the second address region returned is the status/command
923 if (ec
->data_addr
== 0)
924 ec
->data_addr
= resource
->data
.io
.minimum
;
925 else if (ec
->command_addr
== 0)
926 ec
->command_addr
= resource
->data
.io
.minimum
;
928 return AE_CTRL_TERMINATE
;
933 int __init
acpi_boot_ec_enable(void)
935 if (!boot_ec
|| test_bit(EC_FLAGS_HANDLERS_INSTALLED
, &boot_ec
->flags
))
937 if (!ec_install_handlers(boot_ec
)) {
944 static const struct acpi_device_id ec_device_ids
[] = {
949 /* Some BIOS do not survive early DSDT scan, skip it */
950 static int ec_skip_dsdt_scan(const struct dmi_system_id
*id
)
952 EC_FLAGS_SKIP_DSDT_SCAN
= 1;
956 /* ASUStek often supplies us with broken ECDT, validate it */
957 static int ec_validate_ecdt(const struct dmi_system_id
*id
)
959 EC_FLAGS_VALIDATE_ECDT
= 1;
963 /* MSI EC needs special treatment, enable it */
964 static int ec_flag_msi(const struct dmi_system_id
*id
)
966 pr_debug("Detected MSI hardware, enabling workarounds.\n");
968 EC_FLAGS_VALIDATE_ECDT
= 1;
973 * Clevo M720 notebook actually works ok with IRQ mode, if we lifted
974 * the GPE storm threshold back to 20
976 static int ec_enlarge_storm_threshold(const struct dmi_system_id
*id
)
978 pr_debug("Setting the EC GPE storm threshold to 20\n");
979 ec_storm_threshold
= 20;
984 * On some hardware it is necessary to clear events accumulated by the EC during
985 * sleep. These ECs stop reporting GPEs until they are manually polled, if too
986 * many events are accumulated. (e.g. Samsung Series 5/9 notebooks)
988 * https://bugzilla.kernel.org/show_bug.cgi?id=44161
990 * Ideally, the EC should also be instructed NOT to accumulate events during
991 * sleep (which Windows seems to do somehow), but the interface to control this
992 * behaviour is not known at this time.
994 * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx,
995 * however it is very likely that other Samsung models are affected.
997 * On systems which don't accumulate _Q events during sleep, this extra check
998 * should be harmless.
1000 static int ec_clear_on_resume(const struct dmi_system_id
*id
)
1002 pr_debug("Detected system needing EC poll on resume.\n");
1003 EC_FLAGS_CLEAR_ON_RESUME
= 1;
1007 static struct dmi_system_id ec_dmi_table
[] __initdata
= {
1009 ec_skip_dsdt_scan
, "Compal JFL92", {
1010 DMI_MATCH(DMI_BIOS_VENDOR
, "COMPAL"),
1011 DMI_MATCH(DMI_BOARD_NAME
, "JFL92") }, NULL
},
1013 ec_flag_msi
, "MSI hardware", {
1014 DMI_MATCH(DMI_BIOS_VENDOR
, "Micro-Star")}, NULL
},
1016 ec_flag_msi
, "MSI hardware", {
1017 DMI_MATCH(DMI_SYS_VENDOR
, "Micro-Star")}, NULL
},
1019 ec_flag_msi
, "MSI hardware", {
1020 DMI_MATCH(DMI_CHASSIS_VENDOR
, "MICRO-Star")}, NULL
},
1022 ec_flag_msi
, "MSI hardware", {
1023 DMI_MATCH(DMI_CHASSIS_VENDOR
, "MICRO-STAR")}, NULL
},
1025 ec_flag_msi
, "Quanta hardware", {
1026 DMI_MATCH(DMI_SYS_VENDOR
, "Quanta"),
1027 DMI_MATCH(DMI_PRODUCT_NAME
, "TW8/SW8/DW8"),}, NULL
},
1029 ec_flag_msi
, "Quanta hardware", {
1030 DMI_MATCH(DMI_SYS_VENDOR
, "Quanta"),
1031 DMI_MATCH(DMI_PRODUCT_NAME
, "TW9/SW9"),}, NULL
},
1033 ec_flag_msi
, "Clevo W350etq", {
1034 DMI_MATCH(DMI_SYS_VENDOR
, "CLEVO CO."),
1035 DMI_MATCH(DMI_PRODUCT_NAME
, "W35_37ET"),}, NULL
},
1037 ec_validate_ecdt
, "ASUS hardware", {
1038 DMI_MATCH(DMI_BIOS_VENDOR
, "ASUS") }, NULL
},
1040 ec_validate_ecdt
, "ASUS hardware", {
1041 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer Inc.") }, NULL
},
1043 ec_enlarge_storm_threshold
, "CLEVO hardware", {
1044 DMI_MATCH(DMI_SYS_VENDOR
, "CLEVO Co."),
1045 DMI_MATCH(DMI_PRODUCT_NAME
, "M720T/M730T"),}, NULL
},
1047 ec_skip_dsdt_scan
, "HP Folio 13", {
1048 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
1049 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Folio 13"),}, NULL
},
1051 ec_validate_ecdt
, "ASUS hardware", {
1052 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTek Computer Inc."),
1053 DMI_MATCH(DMI_PRODUCT_NAME
, "L4R"),}, NULL
},
1055 ec_clear_on_resume
, "Samsung hardware", {
1056 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL
},
1060 int __init
acpi_ec_ecdt_probe(void)
1063 struct acpi_ec
*saved_ec
= NULL
;
1064 struct acpi_table_ecdt
*ecdt_ptr
;
1066 boot_ec
= make_acpi_ec();
1070 * Generate a boot ec context
1072 dmi_check_system(ec_dmi_table
);
1073 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
1074 (struct acpi_table_header
**)&ecdt_ptr
);
1075 if (ACPI_SUCCESS(status
)) {
1076 pr_info("EC description table is found, configuring boot EC\n");
1077 boot_ec
->command_addr
= ecdt_ptr
->control
.address
;
1078 boot_ec
->data_addr
= ecdt_ptr
->data
.address
;
1079 boot_ec
->gpe
= ecdt_ptr
->gpe
;
1080 boot_ec
->handle
= ACPI_ROOT_OBJECT
;
1081 acpi_get_handle(ACPI_ROOT_OBJECT
, ecdt_ptr
->id
, &boot_ec
->handle
);
1082 /* Don't trust ECDT, which comes from ASUSTek */
1083 if (!EC_FLAGS_VALIDATE_ECDT
)
1085 saved_ec
= kmemdup(boot_ec
, sizeof(struct acpi_ec
), GFP_KERNEL
);
1091 if (EC_FLAGS_SKIP_DSDT_SCAN
) {
1096 /* This workaround is needed only on some broken machines,
1097 * which require early EC, but fail to provide ECDT */
1098 pr_debug("Look up EC in DSDT\n");
1099 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
,
1101 /* Check that acpi_get_devices actually find something */
1102 if (ACPI_FAILURE(status
) || !boot_ec
->handle
)
1105 /* try to find good ECDT from ASUSTek */
1106 if (saved_ec
->command_addr
!= boot_ec
->command_addr
||
1107 saved_ec
->data_addr
!= boot_ec
->data_addr
||
1108 saved_ec
->gpe
!= boot_ec
->gpe
||
1109 saved_ec
->handle
!= boot_ec
->handle
)
1110 pr_info("ASUSTek keeps feeding us with broken "
1111 "ECDT tables, which are very hard to workaround. "
1112 "Trying to use DSDT EC info instead. Please send "
1113 "output of acpidump to linux-acpi@vger.kernel.org\n");
1117 /* We really need to limit this workaround, the only ASUS,
1118 * which needs it, has fake EC._INI method, so use it as flag.
1119 * Keep boot_ec struct as it will be needed soon.
1121 if (!dmi_name_in_vendors("ASUS") ||
1122 !acpi_has_method(boot_ec
->handle
, "_INI"))
1126 if (!ec_install_handlers(boot_ec
)) {
1137 static struct acpi_driver acpi_ec_driver
= {
1139 .class = ACPI_EC_CLASS
,
1140 .ids
= ec_device_ids
,
1143 .remove
= acpi_ec_remove
,
1147 int __init
acpi_ec_init(void)
1151 /* Now register the driver for the EC */
1152 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1159 /* EC driver currently not unloadable */
1161 static void __exit
acpi_ec_exit(void)
1164 acpi_bus_unregister_driver(&acpi_ec_driver
);