1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * ec.c - ACPI Embedded Controller Driver (v3)
5 * Copyright (C) 2001-2015 Intel Corporation
6 * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com>
7 * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
8 * 2006 Denis Sadykov <denis.m.sadykov@intel.com>
9 * 2004 Luming Yu <luming.yu@intel.com>
10 * 2001, 2002 Andy Grover <andrew.grover@intel.com>
11 * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
12 * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
15 /* Uncomment next line to get verbose printout */
17 #define pr_fmt(fmt) "ACPI: EC: " fmt
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/types.h>
23 #include <linux/delay.h>
24 #include <linux/interrupt.h>
25 #include <linux/list.h>
26 #include <linux/spinlock.h>
27 #include <linux/slab.h>
28 #include <linux/suspend.h>
29 #include <linux/acpi.h>
30 #include <linux/dmi.h>
35 #define ACPI_EC_CLASS "embedded_controller"
36 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
38 /* EC status register */
39 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
40 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
41 #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */
42 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
43 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
46 * The SCI_EVT clearing timing is not defined by the ACPI specification.
47 * This leads to lots of practical timing issues for the host EC driver.
48 * The following variations are defined (from the target EC firmware's
50 * STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the
51 * target can clear SCI_EVT at any time so long as the host can see
52 * the indication by reading the status register (EC_SC). So the
53 * host should re-check SCI_EVT after the first time the SCI_EVT
54 * indication is seen, which is the same time the query request
55 * (QR_EC) is written to the command register (EC_CMD). SCI_EVT set
56 * at any later time could indicate another event. Normally such
57 * kind of EC firmware has implemented an event queue and will
58 * return 0x00 to indicate "no outstanding event".
59 * QUERY: After seeing the query request (QR_EC) written to the command
60 * register (EC_CMD) by the host and having prepared the responding
61 * event value in the data register (EC_DATA), the target can safely
62 * clear SCI_EVT because the target can confirm that the current
63 * event is being handled by the host. The host then should check
64 * SCI_EVT right after reading the event response from the data
66 * EVENT: After seeing the event response read from the data register
67 * (EC_DATA) by the host, the target can clear SCI_EVT. As the
68 * target requires time to notice the change in the data register
69 * (EC_DATA), the host may be required to wait additional guarding
70 * time before checking the SCI_EVT again. Such guarding may not be
71 * necessary if the host is notified via another IRQ.
73 #define ACPI_EC_EVT_TIMING_STATUS 0x00
74 #define ACPI_EC_EVT_TIMING_QUERY 0x01
75 #define ACPI_EC_EVT_TIMING_EVENT 0x02
79 ACPI_EC_COMMAND_READ
= 0x80,
80 ACPI_EC_COMMAND_WRITE
= 0x81,
81 ACPI_EC_BURST_ENABLE
= 0x82,
82 ACPI_EC_BURST_DISABLE
= 0x83,
83 ACPI_EC_COMMAND_QUERY
= 0x84,
86 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
87 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
88 #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */
89 #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query
90 * when trying to clear the EC */
91 #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */
94 EC_FLAGS_QUERY_ENABLED
, /* Query is enabled */
95 EC_FLAGS_EVENT_HANDLER_INSTALLED
, /* Event handler installed */
96 EC_FLAGS_EC_HANDLER_INSTALLED
, /* OpReg handler installed */
97 EC_FLAGS_EC_REG_CALLED
, /* OpReg ACPI _REG method called */
98 EC_FLAGS_QUERY_METHODS_INSTALLED
, /* _Qxx handlers installed */
99 EC_FLAGS_STARTED
, /* Driver is started */
100 EC_FLAGS_STOPPED
, /* Driver is stopped */
101 EC_FLAGS_EVENTS_MASKED
, /* Events masked */
104 #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */
105 #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */
107 /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */
108 static unsigned int ec_delay __read_mostly
= ACPI_EC_DELAY
;
109 module_param(ec_delay
, uint
, 0644);
110 MODULE_PARM_DESC(ec_delay
, "Timeout(ms) waited until an EC command completes");
112 static unsigned int ec_max_queries __read_mostly
= ACPI_EC_MAX_QUERIES
;
113 module_param(ec_max_queries
, uint
, 0644);
114 MODULE_PARM_DESC(ec_max_queries
, "Maximum parallel _Qxx evaluations");
116 static bool ec_busy_polling __read_mostly
;
117 module_param(ec_busy_polling
, bool, 0644);
118 MODULE_PARM_DESC(ec_busy_polling
, "Use busy polling to advance EC transaction");
120 static unsigned int ec_polling_guard __read_mostly
= ACPI_EC_UDELAY_POLL
;
121 module_param(ec_polling_guard
, uint
, 0644);
122 MODULE_PARM_DESC(ec_polling_guard
, "Guard time(us) between EC accesses in polling modes");
124 static unsigned int ec_event_clearing __read_mostly
= ACPI_EC_EVT_TIMING_QUERY
;
127 * If the number of false interrupts per one transaction exceeds
128 * this threshold, will think there is a GPE storm happened and
129 * will disable the GPE for normal transaction.
131 static unsigned int ec_storm_threshold __read_mostly
= 8;
132 module_param(ec_storm_threshold
, uint
, 0644);
133 MODULE_PARM_DESC(ec_storm_threshold
, "Maxim false GPE numbers not considered as GPE storm");
135 static bool ec_freeze_events __read_mostly
;
136 module_param(ec_freeze_events
, bool, 0644);
137 MODULE_PARM_DESC(ec_freeze_events
, "Disabling event handling during suspend/resume");
139 static bool ec_no_wakeup __read_mostly
;
140 module_param(ec_no_wakeup
, bool, 0644);
141 MODULE_PARM_DESC(ec_no_wakeup
, "Do not wake up from suspend-to-idle");
143 struct acpi_ec_query_handler
{
144 struct list_head node
;
145 acpi_ec_query_func func
;
155 unsigned short irq_count
;
164 struct acpi_ec_query
{
165 struct transaction transaction
;
166 struct work_struct work
;
167 struct acpi_ec_query_handler
*handler
;
171 static int acpi_ec_submit_query(struct acpi_ec
*ec
);
172 static void advance_transaction(struct acpi_ec
*ec
, bool interrupt
);
173 static void acpi_ec_event_handler(struct work_struct
*work
);
175 struct acpi_ec
*first_ec
;
176 EXPORT_SYMBOL(first_ec
);
178 static struct acpi_ec
*boot_ec
;
179 static bool boot_ec_is_ecdt
;
180 static struct workqueue_struct
*ec_wq
;
181 static struct workqueue_struct
*ec_query_wq
;
183 static int EC_FLAGS_CORRECT_ECDT
; /* Needs ECDT port address correction */
184 static int EC_FLAGS_TRUST_DSDT_GPE
; /* Needs DSDT GPE as correction setting */
185 static int EC_FLAGS_CLEAR_ON_RESUME
; /* Needs acpi_ec_clear() on boot/resume */
187 /* --------------------------------------------------------------------------
189 * -------------------------------------------------------------------------- */
192 * Splitters used by the developers to track the boundary of the EC
193 * handling processes.
196 #define EC_DBG_SEP " "
197 #define EC_DBG_DRV "+++++"
198 #define EC_DBG_STM "====="
199 #define EC_DBG_REQ "*****"
200 #define EC_DBG_EVT "#####"
202 #define EC_DBG_SEP ""
209 #define ec_log_raw(fmt, ...) \
210 pr_info(fmt "\n", ##__VA_ARGS__)
211 #define ec_dbg_raw(fmt, ...) \
212 pr_debug(fmt "\n", ##__VA_ARGS__)
213 #define ec_log(filter, fmt, ...) \
214 ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)
215 #define ec_dbg(filter, fmt, ...) \
216 ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)
218 #define ec_log_drv(fmt, ...) \
219 ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__)
220 #define ec_dbg_drv(fmt, ...) \
221 ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__)
222 #define ec_dbg_stm(fmt, ...) \
223 ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__)
224 #define ec_dbg_req(fmt, ...) \
225 ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__)
226 #define ec_dbg_evt(fmt, ...) \
227 ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__)
228 #define ec_dbg_ref(ec, fmt, ...) \
229 ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__)
231 /* --------------------------------------------------------------------------
233 * -------------------------------------------------------------------------- */
235 static bool acpi_ec_started(struct acpi_ec
*ec
)
237 return test_bit(EC_FLAGS_STARTED
, &ec
->flags
) &&
238 !test_bit(EC_FLAGS_STOPPED
, &ec
->flags
);
241 static bool acpi_ec_event_enabled(struct acpi_ec
*ec
)
244 * There is an OSPM early stage logic. During the early stages
245 * (boot/resume), OSPMs shouldn't enable the event handling, only
246 * the EC transactions are allowed to be performed.
248 if (!test_bit(EC_FLAGS_QUERY_ENABLED
, &ec
->flags
))
251 * However, disabling the event handling is experimental for late
252 * stage (suspend), and is controlled by the boot parameter of
253 * "ec_freeze_events":
254 * 1. true: The EC event handling is disabled before entering
256 * 2. false: The EC event handling is automatically disabled as
257 * soon as the EC driver is stopped.
259 if (ec_freeze_events
)
260 return acpi_ec_started(ec
);
262 return test_bit(EC_FLAGS_STARTED
, &ec
->flags
);
265 static bool acpi_ec_flushed(struct acpi_ec
*ec
)
267 return ec
->reference_count
== 1;
270 /* --------------------------------------------------------------------------
272 * -------------------------------------------------------------------------- */
274 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
276 u8 x
= inb(ec
->command_addr
);
278 ec_dbg_raw("EC_SC(R) = 0x%2.2x "
279 "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d",
281 !!(x
& ACPI_EC_FLAG_SCI
),
282 !!(x
& ACPI_EC_FLAG_BURST
),
283 !!(x
& ACPI_EC_FLAG_CMD
),
284 !!(x
& ACPI_EC_FLAG_IBF
),
285 !!(x
& ACPI_EC_FLAG_OBF
));
289 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
291 u8 x
= inb(ec
->data_addr
);
293 ec
->timestamp
= jiffies
;
294 ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x
);
298 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
300 ec_dbg_raw("EC_SC(W) = 0x%2.2x", command
);
301 outb(command
, ec
->command_addr
);
302 ec
->timestamp
= jiffies
;
305 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
307 ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data
);
308 outb(data
, ec
->data_addr
);
309 ec
->timestamp
= jiffies
;
312 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
313 static const char *acpi_ec_cmd_string(u8 cmd
)
330 #define acpi_ec_cmd_string(cmd) "UNDEF"
333 /* --------------------------------------------------------------------------
335 * -------------------------------------------------------------------------- */
337 static inline bool acpi_ec_gpe_status_set(struct acpi_ec
*ec
)
339 acpi_event_status gpe_status
= 0;
341 (void)acpi_get_gpe_status(NULL
, ec
->gpe
, &gpe_status
);
342 return !!(gpe_status
& ACPI_EVENT_FLAG_STATUS_SET
);
345 static inline void acpi_ec_enable_gpe(struct acpi_ec
*ec
, bool open
)
348 acpi_enable_gpe(NULL
, ec
->gpe
);
350 BUG_ON(ec
->reference_count
< 1);
351 acpi_set_gpe(NULL
, ec
->gpe
, ACPI_GPE_ENABLE
);
353 if (acpi_ec_gpe_status_set(ec
)) {
355 * On some platforms, EN=1 writes cannot trigger GPE. So
356 * software need to manually trigger a pseudo GPE event on
359 ec_dbg_raw("Polling quirk");
360 advance_transaction(ec
, false);
364 static inline void acpi_ec_disable_gpe(struct acpi_ec
*ec
, bool close
)
367 acpi_disable_gpe(NULL
, ec
->gpe
);
369 BUG_ON(ec
->reference_count
< 1);
370 acpi_set_gpe(NULL
, ec
->gpe
, ACPI_GPE_DISABLE
);
374 /* --------------------------------------------------------------------------
375 * Transaction Management
376 * -------------------------------------------------------------------------- */
378 static void acpi_ec_submit_request(struct acpi_ec
*ec
)
380 ec
->reference_count
++;
381 if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
) &&
382 ec
->gpe
>= 0 && ec
->reference_count
== 1)
383 acpi_ec_enable_gpe(ec
, true);
386 static void acpi_ec_complete_request(struct acpi_ec
*ec
)
388 bool flushed
= false;
390 ec
->reference_count
--;
391 if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
) &&
392 ec
->gpe
>= 0 && ec
->reference_count
== 0)
393 acpi_ec_disable_gpe(ec
, true);
394 flushed
= acpi_ec_flushed(ec
);
399 static void acpi_ec_mask_events(struct acpi_ec
*ec
)
401 if (!test_bit(EC_FLAGS_EVENTS_MASKED
, &ec
->flags
)) {
403 acpi_ec_disable_gpe(ec
, false);
405 disable_irq_nosync(ec
->irq
);
407 ec_dbg_drv("Polling enabled");
408 set_bit(EC_FLAGS_EVENTS_MASKED
, &ec
->flags
);
412 static void acpi_ec_unmask_events(struct acpi_ec
*ec
)
414 if (test_bit(EC_FLAGS_EVENTS_MASKED
, &ec
->flags
)) {
415 clear_bit(EC_FLAGS_EVENTS_MASKED
, &ec
->flags
);
417 acpi_ec_enable_gpe(ec
, false);
421 ec_dbg_drv("Polling disabled");
426 * acpi_ec_submit_flushable_request() - Increase the reference count unless
427 * the flush operation is not in
431 * This function must be used before taking a new action that should hold
432 * the reference count. If this function returns false, then the action
433 * must be discarded or it will prevent the flush operation from being
436 static bool acpi_ec_submit_flushable_request(struct acpi_ec
*ec
)
438 if (!acpi_ec_started(ec
))
440 acpi_ec_submit_request(ec
);
444 static void acpi_ec_submit_event(struct acpi_ec
*ec
)
447 * It is safe to mask the events here, because acpi_ec_close_event()
448 * will run at least once after this.
450 acpi_ec_mask_events(ec
);
451 if (!acpi_ec_event_enabled(ec
))
454 if (ec
->event_state
!= EC_EVENT_READY
)
457 ec_dbg_evt("Command(%s) submitted/blocked",
458 acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY
));
460 ec
->event_state
= EC_EVENT_IN_PROGRESS
;
462 * If events_to_process is greater than 0 at this point, the while ()
463 * loop in acpi_ec_event_handler() is still running and incrementing
464 * events_to_process will cause it to invoke acpi_ec_submit_query() once
465 * more, so it is not necessary to queue up the event work to start the
468 if (ec
->events_to_process
++ > 0)
471 ec
->events_in_progress
++;
472 queue_work(ec_wq
, &ec
->work
);
475 static void acpi_ec_complete_event(struct acpi_ec
*ec
)
477 if (ec
->event_state
== EC_EVENT_IN_PROGRESS
)
478 ec
->event_state
= EC_EVENT_COMPLETE
;
481 static void acpi_ec_close_event(struct acpi_ec
*ec
)
483 if (ec
->event_state
!= EC_EVENT_READY
)
484 ec_dbg_evt("Command(%s) unblocked",
485 acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY
));
487 ec
->event_state
= EC_EVENT_READY
;
488 acpi_ec_unmask_events(ec
);
491 static inline void __acpi_ec_enable_event(struct acpi_ec
*ec
)
493 if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED
, &ec
->flags
))
494 ec_log_drv("event unblocked");
496 * Unconditionally invoke this once after enabling the event
497 * handling mechanism to detect the pending events.
499 advance_transaction(ec
, false);
502 static inline void __acpi_ec_disable_event(struct acpi_ec
*ec
)
504 if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED
, &ec
->flags
))
505 ec_log_drv("event blocked");
509 * Process _Q events that might have accumulated in the EC.
510 * Run with locked ec mutex.
512 static void acpi_ec_clear(struct acpi_ec
*ec
)
516 for (i
= 0; i
< ACPI_EC_CLEAR_MAX
; i
++) {
517 if (acpi_ec_submit_query(ec
))
520 if (unlikely(i
== ACPI_EC_CLEAR_MAX
))
521 pr_warn("Warning: Maximum of %d stale EC events cleared\n", i
);
523 pr_info("%d stale EC events cleared\n", i
);
526 static void acpi_ec_enable_event(struct acpi_ec
*ec
)
530 spin_lock_irqsave(&ec
->lock
, flags
);
531 if (acpi_ec_started(ec
))
532 __acpi_ec_enable_event(ec
);
533 spin_unlock_irqrestore(&ec
->lock
, flags
);
535 /* Drain additional events if hardware requires that */
536 if (EC_FLAGS_CLEAR_ON_RESUME
)
540 #ifdef CONFIG_PM_SLEEP
541 static void __acpi_ec_flush_work(void)
543 flush_workqueue(ec_wq
); /* flush ec->work */
544 flush_workqueue(ec_query_wq
); /* flush queries */
547 static void acpi_ec_disable_event(struct acpi_ec
*ec
)
551 spin_lock_irqsave(&ec
->lock
, flags
);
552 __acpi_ec_disable_event(ec
);
553 spin_unlock_irqrestore(&ec
->lock
, flags
);
556 * When ec_freeze_events is true, we need to flush events in
557 * the proper position before entering the noirq stage.
559 __acpi_ec_flush_work();
562 void acpi_ec_flush_work(void)
564 /* Without ec_wq there is nothing to flush. */
568 __acpi_ec_flush_work();
570 #endif /* CONFIG_PM_SLEEP */
572 static bool acpi_ec_guard_event(struct acpi_ec
*ec
)
577 spin_lock_irqsave(&ec
->lock
, flags
);
579 * If firmware SCI_EVT clearing timing is "event", we actually
580 * don't know when the SCI_EVT will be cleared by firmware after
581 * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an
584 * The guarding period is applicable if the event state is not
585 * EC_EVENT_READY, but otherwise if the current transaction is of the
586 * ACPI_EC_COMMAND_QUERY type, the guarding should have elapsed already
587 * and it should not be applied to let the transaction transition into
588 * the ACPI_EC_COMMAND_POLL state immediately.
590 guarded
= ec_event_clearing
== ACPI_EC_EVT_TIMING_EVENT
&&
591 ec
->event_state
!= EC_EVENT_READY
&&
592 (!ec
->curr
|| ec
->curr
->command
!= ACPI_EC_COMMAND_QUERY
);
593 spin_unlock_irqrestore(&ec
->lock
, flags
);
597 static int ec_transaction_polled(struct acpi_ec
*ec
)
602 spin_lock_irqsave(&ec
->lock
, flags
);
603 if (ec
->curr
&& (ec
->curr
->flags
& ACPI_EC_COMMAND_POLL
))
605 spin_unlock_irqrestore(&ec
->lock
, flags
);
609 static int ec_transaction_completed(struct acpi_ec
*ec
)
614 spin_lock_irqsave(&ec
->lock
, flags
);
615 if (ec
->curr
&& (ec
->curr
->flags
& ACPI_EC_COMMAND_COMPLETE
))
617 spin_unlock_irqrestore(&ec
->lock
, flags
);
621 static inline void ec_transaction_transition(struct acpi_ec
*ec
, unsigned long flag
)
623 ec
->curr
->flags
|= flag
;
625 if (ec
->curr
->command
!= ACPI_EC_COMMAND_QUERY
)
628 switch (ec_event_clearing
) {
629 case ACPI_EC_EVT_TIMING_STATUS
:
630 if (flag
== ACPI_EC_COMMAND_POLL
)
631 acpi_ec_close_event(ec
);
635 case ACPI_EC_EVT_TIMING_QUERY
:
636 if (flag
== ACPI_EC_COMMAND_COMPLETE
)
637 acpi_ec_close_event(ec
);
641 case ACPI_EC_EVT_TIMING_EVENT
:
642 if (flag
== ACPI_EC_COMMAND_COMPLETE
)
643 acpi_ec_complete_event(ec
);
647 static void acpi_ec_spurious_interrupt(struct acpi_ec
*ec
, struct transaction
*t
)
649 if (t
->irq_count
< ec_storm_threshold
)
652 /* Trigger if the threshold is 0 too. */
653 if (t
->irq_count
== ec_storm_threshold
)
654 acpi_ec_mask_events(ec
);
657 static void advance_transaction(struct acpi_ec
*ec
, bool interrupt
)
659 struct transaction
*t
= ec
->curr
;
663 ec_dbg_stm("%s (%d)", interrupt
? "IRQ" : "TASK", smp_processor_id());
665 status
= acpi_ec_read_status(ec
);
668 * Another IRQ or a guarded polling mode advancement is detected,
669 * the next QR_EC submission is then allowed.
671 if (!t
|| !(t
->flags
& ACPI_EC_COMMAND_POLL
)) {
672 if (ec_event_clearing
== ACPI_EC_EVT_TIMING_EVENT
&&
673 ec
->event_state
== EC_EVENT_COMPLETE
)
674 acpi_ec_close_event(ec
);
680 if (t
->flags
& ACPI_EC_COMMAND_POLL
) {
681 if (t
->wlen
> t
->wi
) {
682 if (!(status
& ACPI_EC_FLAG_IBF
))
683 acpi_ec_write_data(ec
, t
->wdata
[t
->wi
++]);
684 else if (interrupt
&& !(status
& ACPI_EC_FLAG_SCI
))
685 acpi_ec_spurious_interrupt(ec
, t
);
686 } else if (t
->rlen
> t
->ri
) {
687 if (status
& ACPI_EC_FLAG_OBF
) {
688 t
->rdata
[t
->ri
++] = acpi_ec_read_data(ec
);
689 if (t
->rlen
== t
->ri
) {
690 ec_transaction_transition(ec
, ACPI_EC_COMMAND_COMPLETE
);
692 if (t
->command
== ACPI_EC_COMMAND_QUERY
)
693 ec_dbg_evt("Command(%s) completed by hardware",
694 acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY
));
696 } else if (interrupt
&& !(status
& ACPI_EC_FLAG_SCI
)) {
697 acpi_ec_spurious_interrupt(ec
, t
);
699 } else if (t
->wlen
== t
->wi
&& !(status
& ACPI_EC_FLAG_IBF
)) {
700 ec_transaction_transition(ec
, ACPI_EC_COMMAND_COMPLETE
);
703 } else if (!(status
& ACPI_EC_FLAG_IBF
)) {
704 acpi_ec_write_cmd(ec
, t
->command
);
705 ec_transaction_transition(ec
, ACPI_EC_COMMAND_POLL
);
709 if (status
& ACPI_EC_FLAG_SCI
)
710 acpi_ec_submit_event(ec
);
712 if (wakeup
&& interrupt
)
716 static void start_transaction(struct acpi_ec
*ec
)
718 ec
->curr
->irq_count
= ec
->curr
->wi
= ec
->curr
->ri
= 0;
722 static int ec_guard(struct acpi_ec
*ec
)
724 unsigned long guard
= usecs_to_jiffies(ec
->polling_guard
);
725 unsigned long timeout
= ec
->timestamp
+ guard
;
727 /* Ensure guarding period before polling EC status */
729 if (ec
->busy_polling
) {
730 /* Perform busy polling */
731 if (ec_transaction_completed(ec
))
733 udelay(jiffies_to_usecs(guard
));
736 * Perform wait polling
737 * 1. Wait the transaction to be completed by the
738 * GPE handler after the transaction enters
739 * ACPI_EC_COMMAND_POLL state.
740 * 2. A special guarding logic is also required
741 * for event clearing mode "event" before the
742 * transaction enters ACPI_EC_COMMAND_POLL
745 if (!ec_transaction_polled(ec
) &&
746 !acpi_ec_guard_event(ec
))
748 if (wait_event_timeout(ec
->wait
,
749 ec_transaction_completed(ec
),
753 } while (time_before(jiffies
, timeout
));
757 static int ec_poll(struct acpi_ec
*ec
)
760 int repeat
= 5; /* number of command restarts */
763 unsigned long delay
= jiffies
+
764 msecs_to_jiffies(ec_delay
);
768 spin_lock_irqsave(&ec
->lock
, flags
);
769 advance_transaction(ec
, false);
770 spin_unlock_irqrestore(&ec
->lock
, flags
);
771 } while (time_before(jiffies
, delay
));
772 pr_debug("controller reset, restart transaction\n");
773 spin_lock_irqsave(&ec
->lock
, flags
);
774 start_transaction(ec
);
775 spin_unlock_irqrestore(&ec
->lock
, flags
);
780 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
,
781 struct transaction
*t
)
786 /* start transaction */
787 spin_lock_irqsave(&ec
->lock
, tmp
);
788 /* Enable GPE for command processing (IBF=0/OBF=1) */
789 if (!acpi_ec_submit_flushable_request(ec
)) {
793 ec_dbg_ref(ec
, "Increase command");
794 /* following two actions should be kept atomic */
796 ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t
->command
));
797 start_transaction(ec
);
798 spin_unlock_irqrestore(&ec
->lock
, tmp
);
802 spin_lock_irqsave(&ec
->lock
, tmp
);
803 if (t
->irq_count
== ec_storm_threshold
)
804 acpi_ec_unmask_events(ec
);
805 ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t
->command
));
807 /* Disable GPE for command processing (IBF=0/OBF=1) */
808 acpi_ec_complete_request(ec
);
809 ec_dbg_ref(ec
, "Decrease command");
811 spin_unlock_irqrestore(&ec
->lock
, tmp
);
815 static int acpi_ec_transaction(struct acpi_ec
*ec
, struct transaction
*t
)
820 if (!ec
|| (!t
) || (t
->wlen
&& !t
->wdata
) || (t
->rlen
&& !t
->rdata
))
823 memset(t
->rdata
, 0, t
->rlen
);
825 mutex_lock(&ec
->mutex
);
826 if (ec
->global_lock
) {
827 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
828 if (ACPI_FAILURE(status
)) {
834 status
= acpi_ec_transaction_unlocked(ec
, t
);
837 acpi_release_global_lock(glk
);
839 mutex_unlock(&ec
->mutex
);
843 static int acpi_ec_burst_enable(struct acpi_ec
*ec
)
846 struct transaction t
= {.command
= ACPI_EC_BURST_ENABLE
,
847 .wdata
= NULL
, .rdata
= &d
,
848 .wlen
= 0, .rlen
= 1};
850 return acpi_ec_transaction(ec
, &t
);
853 static int acpi_ec_burst_disable(struct acpi_ec
*ec
)
855 struct transaction t
= {.command
= ACPI_EC_BURST_DISABLE
,
856 .wdata
= NULL
, .rdata
= NULL
,
857 .wlen
= 0, .rlen
= 0};
859 return (acpi_ec_read_status(ec
) & ACPI_EC_FLAG_BURST
) ?
860 acpi_ec_transaction(ec
, &t
) : 0;
863 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
*data
)
867 struct transaction t
= {.command
= ACPI_EC_COMMAND_READ
,
868 .wdata
= &address
, .rdata
= &d
,
869 .wlen
= 1, .rlen
= 1};
871 result
= acpi_ec_transaction(ec
, &t
);
876 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
878 u8 wdata
[2] = { address
, data
};
879 struct transaction t
= {.command
= ACPI_EC_COMMAND_WRITE
,
880 .wdata
= wdata
, .rdata
= NULL
,
881 .wlen
= 2, .rlen
= 0};
883 return acpi_ec_transaction(ec
, &t
);
886 int ec_read(u8 addr
, u8
*val
)
894 err
= acpi_ec_read(first_ec
, addr
, &temp_data
);
902 EXPORT_SYMBOL(ec_read
);
904 int ec_write(u8 addr
, u8 val
)
909 return acpi_ec_write(first_ec
, addr
, val
);
911 EXPORT_SYMBOL(ec_write
);
913 int ec_transaction(u8 command
,
914 const u8
*wdata
, unsigned wdata_len
,
915 u8
*rdata
, unsigned rdata_len
)
917 struct transaction t
= {.command
= command
,
918 .wdata
= wdata
, .rdata
= rdata
,
919 .wlen
= wdata_len
, .rlen
= rdata_len
};
924 return acpi_ec_transaction(first_ec
, &t
);
926 EXPORT_SYMBOL(ec_transaction
);
928 /* Get the handle to the EC device */
929 acpi_handle
ec_get_handle(void)
933 return first_ec
->handle
;
935 EXPORT_SYMBOL(ec_get_handle
);
937 static void acpi_ec_start(struct acpi_ec
*ec
, bool resuming
)
941 spin_lock_irqsave(&ec
->lock
, flags
);
942 if (!test_and_set_bit(EC_FLAGS_STARTED
, &ec
->flags
)) {
943 ec_dbg_drv("Starting EC");
944 /* Enable GPE for event processing (SCI_EVT=1) */
946 acpi_ec_submit_request(ec
);
947 ec_dbg_ref(ec
, "Increase driver");
949 ec_log_drv("EC started");
951 spin_unlock_irqrestore(&ec
->lock
, flags
);
954 static bool acpi_ec_stopped(struct acpi_ec
*ec
)
959 spin_lock_irqsave(&ec
->lock
, flags
);
960 flushed
= acpi_ec_flushed(ec
);
961 spin_unlock_irqrestore(&ec
->lock
, flags
);
965 static void acpi_ec_stop(struct acpi_ec
*ec
, bool suspending
)
969 spin_lock_irqsave(&ec
->lock
, flags
);
970 if (acpi_ec_started(ec
)) {
971 ec_dbg_drv("Stopping EC");
972 set_bit(EC_FLAGS_STOPPED
, &ec
->flags
);
973 spin_unlock_irqrestore(&ec
->lock
, flags
);
974 wait_event(ec
->wait
, acpi_ec_stopped(ec
));
975 spin_lock_irqsave(&ec
->lock
, flags
);
976 /* Disable GPE for event processing (SCI_EVT=1) */
978 acpi_ec_complete_request(ec
);
979 ec_dbg_ref(ec
, "Decrease driver");
980 } else if (!ec_freeze_events
)
981 __acpi_ec_disable_event(ec
);
982 clear_bit(EC_FLAGS_STARTED
, &ec
->flags
);
983 clear_bit(EC_FLAGS_STOPPED
, &ec
->flags
);
984 ec_log_drv("EC stopped");
986 spin_unlock_irqrestore(&ec
->lock
, flags
);
989 static void acpi_ec_enter_noirq(struct acpi_ec
*ec
)
993 spin_lock_irqsave(&ec
->lock
, flags
);
994 ec
->busy_polling
= true;
995 ec
->polling_guard
= 0;
996 ec_log_drv("interrupt blocked");
997 spin_unlock_irqrestore(&ec
->lock
, flags
);
1000 static void acpi_ec_leave_noirq(struct acpi_ec
*ec
)
1002 unsigned long flags
;
1004 spin_lock_irqsave(&ec
->lock
, flags
);
1005 ec
->busy_polling
= ec_busy_polling
;
1006 ec
->polling_guard
= ec_polling_guard
;
1007 ec_log_drv("interrupt unblocked");
1008 spin_unlock_irqrestore(&ec
->lock
, flags
);
1011 void acpi_ec_block_transactions(void)
1013 struct acpi_ec
*ec
= first_ec
;
1018 mutex_lock(&ec
->mutex
);
1019 /* Prevent transactions from being carried out */
1020 acpi_ec_stop(ec
, true);
1021 mutex_unlock(&ec
->mutex
);
1024 void acpi_ec_unblock_transactions(void)
1027 * Allow transactions to happen again (this function is called from
1028 * atomic context during wakeup, so we don't need to acquire the mutex).
1031 acpi_ec_start(first_ec
, true);
1034 /* --------------------------------------------------------------------------
1036 -------------------------------------------------------------------------- */
1037 static struct acpi_ec_query_handler
*
1038 acpi_ec_get_query_handler_by_value(struct acpi_ec
*ec
, u8 value
)
1040 struct acpi_ec_query_handler
*handler
;
1042 mutex_lock(&ec
->mutex
);
1043 list_for_each_entry(handler
, &ec
->list
, node
) {
1044 if (value
== handler
->query_bit
) {
1045 kref_get(&handler
->kref
);
1046 mutex_unlock(&ec
->mutex
);
1050 mutex_unlock(&ec
->mutex
);
1054 static void acpi_ec_query_handler_release(struct kref
*kref
)
1056 struct acpi_ec_query_handler
*handler
=
1057 container_of(kref
, struct acpi_ec_query_handler
, kref
);
1062 static void acpi_ec_put_query_handler(struct acpi_ec_query_handler
*handler
)
1064 kref_put(&handler
->kref
, acpi_ec_query_handler_release
);
1067 int acpi_ec_add_query_handler(struct acpi_ec
*ec
, u8 query_bit
,
1068 acpi_handle handle
, acpi_ec_query_func func
,
1071 struct acpi_ec_query_handler
*handler
;
1073 if (!handle
&& !func
)
1076 handler
= kzalloc(sizeof(*handler
), GFP_KERNEL
);
1080 handler
->query_bit
= query_bit
;
1081 handler
->handle
= handle
;
1082 handler
->func
= func
;
1083 handler
->data
= data
;
1084 mutex_lock(&ec
->mutex
);
1085 kref_init(&handler
->kref
);
1086 list_add(&handler
->node
, &ec
->list
);
1087 mutex_unlock(&ec
->mutex
);
1091 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler
);
1093 static void acpi_ec_remove_query_handlers(struct acpi_ec
*ec
,
1094 bool remove_all
, u8 query_bit
)
1096 struct acpi_ec_query_handler
*handler
, *tmp
;
1097 LIST_HEAD(free_list
);
1099 mutex_lock(&ec
->mutex
);
1100 list_for_each_entry_safe(handler
, tmp
, &ec
->list
, node
) {
1102 * When remove_all is false, only remove custom query handlers
1103 * which have handler->func set. This is done to preserve query
1104 * handlers discovered thru ACPI, as they should continue handling
1107 if (remove_all
|| (handler
->func
&& handler
->query_bit
== query_bit
)) {
1108 list_del_init(&handler
->node
);
1109 list_add(&handler
->node
, &free_list
);
1113 mutex_unlock(&ec
->mutex
);
1114 list_for_each_entry_safe(handler
, tmp
, &free_list
, node
)
1115 acpi_ec_put_query_handler(handler
);
1118 void acpi_ec_remove_query_handler(struct acpi_ec
*ec
, u8 query_bit
)
1120 acpi_ec_remove_query_handlers(ec
, false, query_bit
);
1121 flush_workqueue(ec_query_wq
);
1123 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler
);
1125 static void acpi_ec_event_processor(struct work_struct
*work
)
1127 struct acpi_ec_query
*q
= container_of(work
, struct acpi_ec_query
, work
);
1128 struct acpi_ec_query_handler
*handler
= q
->handler
;
1129 struct acpi_ec
*ec
= q
->ec
;
1131 ec_dbg_evt("Query(0x%02x) started", handler
->query_bit
);
1134 handler
->func(handler
->data
);
1135 else if (handler
->handle
)
1136 acpi_evaluate_object(handler
->handle
, NULL
, NULL
, NULL
);
1138 ec_dbg_evt("Query(0x%02x) stopped", handler
->query_bit
);
1140 spin_lock_irq(&ec
->lock
);
1141 ec
->queries_in_progress
--;
1142 spin_unlock_irq(&ec
->lock
);
1144 acpi_ec_put_query_handler(handler
);
1148 static struct acpi_ec_query
*acpi_ec_create_query(struct acpi_ec
*ec
, u8
*pval
)
1150 struct acpi_ec_query
*q
;
1151 struct transaction
*t
;
1153 q
= kzalloc(sizeof (struct acpi_ec_query
), GFP_KERNEL
);
1157 INIT_WORK(&q
->work
, acpi_ec_event_processor
);
1158 t
= &q
->transaction
;
1159 t
->command
= ACPI_EC_COMMAND_QUERY
;
1166 static int acpi_ec_submit_query(struct acpi_ec
*ec
)
1168 struct acpi_ec_query
*q
;
1172 q
= acpi_ec_create_query(ec
, &value
);
1177 * Query the EC to find out which _Qxx method we need to evaluate.
1178 * Note that successful completion of the query causes the ACPI_EC_SCI
1179 * bit to be cleared (and thus clearing the interrupt source).
1181 result
= acpi_ec_transaction(ec
, &q
->transaction
);
1190 q
->handler
= acpi_ec_get_query_handler_by_value(ec
, value
);
1197 * It is reported that _Qxx are evaluated in a parallel way on Windows:
1198 * https://bugzilla.kernel.org/show_bug.cgi?id=94411
1200 * Put this log entry before queue_work() to make it appear in the log
1201 * before any other messages emitted during workqueue handling.
1203 ec_dbg_evt("Query(0x%02x) scheduled", value
);
1205 spin_lock_irq(&ec
->lock
);
1207 ec
->queries_in_progress
++;
1208 queue_work(ec_query_wq
, &q
->work
);
1210 spin_unlock_irq(&ec
->lock
);
1220 static void acpi_ec_event_handler(struct work_struct
*work
)
1222 struct acpi_ec
*ec
= container_of(work
, struct acpi_ec
, work
);
1224 ec_dbg_evt("Event started");
1226 spin_lock_irq(&ec
->lock
);
1228 while (ec
->events_to_process
) {
1229 spin_unlock_irq(&ec
->lock
);
1231 acpi_ec_submit_query(ec
);
1233 spin_lock_irq(&ec
->lock
);
1235 ec
->events_to_process
--;
1239 * Before exit, make sure that the it will be possible to queue up the
1240 * event handling work again regardless of whether or not the query
1241 * queued up above is processed successfully.
1243 if (ec_event_clearing
== ACPI_EC_EVT_TIMING_EVENT
) {
1246 acpi_ec_complete_event(ec
);
1248 ec_dbg_evt("Event stopped");
1250 spin_unlock_irq(&ec
->lock
);
1252 guard_timeout
= !!ec_guard(ec
);
1254 spin_lock_irq(&ec
->lock
);
1256 /* Take care of SCI_EVT unless someone else is doing that. */
1257 if (guard_timeout
&& !ec
->curr
)
1258 advance_transaction(ec
, false);
1260 acpi_ec_close_event(ec
);
1262 ec_dbg_evt("Event stopped");
1265 ec
->events_in_progress
--;
1267 spin_unlock_irq(&ec
->lock
);
1270 static void clear_gpe_and_advance_transaction(struct acpi_ec
*ec
, bool interrupt
)
1273 * Clear GPE_STS upfront to allow subsequent hardware GPE_STS 0->1
1274 * changes to always trigger a GPE interrupt.
1276 * GPE STS is a W1C register, which means:
1278 * 1. Software can clear it without worrying about clearing the other
1279 * GPEs' STS bits when the hardware sets them in parallel.
1281 * 2. As long as software can ensure only clearing it when it is set,
1282 * hardware won't set it in parallel.
1284 if (ec
->gpe
>= 0 && acpi_ec_gpe_status_set(ec
))
1285 acpi_clear_gpe(NULL
, ec
->gpe
);
1287 advance_transaction(ec
, true);
1290 static void acpi_ec_handle_interrupt(struct acpi_ec
*ec
)
1292 unsigned long flags
;
1294 spin_lock_irqsave(&ec
->lock
, flags
);
1296 clear_gpe_and_advance_transaction(ec
, true);
1298 spin_unlock_irqrestore(&ec
->lock
, flags
);
1301 static u32
acpi_ec_gpe_handler(acpi_handle gpe_device
,
1302 u32 gpe_number
, void *data
)
1304 acpi_ec_handle_interrupt(data
);
1305 return ACPI_INTERRUPT_HANDLED
;
1308 static irqreturn_t
acpi_ec_irq_handler(int irq
, void *data
)
1310 acpi_ec_handle_interrupt(data
);
1314 /* --------------------------------------------------------------------------
1315 * Address Space Management
1316 * -------------------------------------------------------------------------- */
1319 acpi_ec_space_handler(u32 function
, acpi_physical_address address
,
1320 u32 bits
, u64
*value64
,
1321 void *handler_context
, void *region_context
)
1323 struct acpi_ec
*ec
= handler_context
;
1324 int result
= 0, i
, bytes
= bits
/ 8;
1325 u8
*value
= (u8
*)value64
;
1327 if ((address
> 0xFF) || !value
|| !handler_context
)
1328 return AE_BAD_PARAMETER
;
1330 if (function
!= ACPI_READ
&& function
!= ACPI_WRITE
)
1331 return AE_BAD_PARAMETER
;
1333 if (ec
->busy_polling
|| bits
> 8)
1334 acpi_ec_burst_enable(ec
);
1336 for (i
= 0; i
< bytes
; ++i
, ++address
, ++value
) {
1337 result
= (function
== ACPI_READ
) ?
1338 acpi_ec_read(ec
, address
, value
) :
1339 acpi_ec_write(ec
, address
, *value
);
1344 if (ec
->busy_polling
|| bits
> 8)
1345 acpi_ec_burst_disable(ec
);
1349 return AE_BAD_PARAMETER
;
1351 return AE_NOT_FOUND
;
1361 /* --------------------------------------------------------------------------
1363 * -------------------------------------------------------------------------- */
1366 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
);
1368 static void acpi_ec_free(struct acpi_ec
*ec
)
1377 static struct acpi_ec
*acpi_ec_alloc(void)
1379 struct acpi_ec
*ec
= kzalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
1383 mutex_init(&ec
->mutex
);
1384 init_waitqueue_head(&ec
->wait
);
1385 INIT_LIST_HEAD(&ec
->list
);
1386 spin_lock_init(&ec
->lock
);
1387 INIT_WORK(&ec
->work
, acpi_ec_event_handler
);
1388 ec
->timestamp
= jiffies
;
1389 ec
->busy_polling
= true;
1390 ec
->polling_guard
= 0;
1397 acpi_ec_register_query_methods(acpi_handle handle
, u32 level
,
1398 void *context
, void **return_value
)
1401 struct acpi_buffer buffer
= { sizeof(node_name
), node_name
};
1402 struct acpi_ec
*ec
= context
;
1406 status
= acpi_get_name(handle
, ACPI_SINGLE_NAME
, &buffer
);
1408 if (ACPI_SUCCESS(status
) && sscanf(node_name
, "_Q%x", &value
) == 1)
1409 acpi_ec_add_query_handler(ec
, value
, handle
, NULL
, NULL
);
1414 ec_parse_device(acpi_handle handle
, u32 Level
, void *context
, void **retval
)
1417 unsigned long long tmp
= 0;
1418 struct acpi_ec
*ec
= context
;
1420 /* clear addr values, ec_parse_io_ports depend on it */
1421 ec
->command_addr
= ec
->data_addr
= 0;
1423 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
1424 ec_parse_io_ports
, ec
);
1425 if (ACPI_FAILURE(status
))
1427 if (ec
->data_addr
== 0 || ec
->command_addr
== 0)
1430 /* Get GPE bit assignment (EC events). */
1431 /* TODO: Add support for _GPE returning a package */
1432 status
= acpi_evaluate_integer(handle
, "_GPE", NULL
, &tmp
);
1433 if (ACPI_SUCCESS(status
))
1436 * Errors are non-fatal, allowing for ACPI Reduced Hardware
1437 * platforms which use GpioInt instead of GPE.
1440 /* Use the global lock for all EC transactions? */
1442 acpi_evaluate_integer(handle
, "_GLK", NULL
, &tmp
);
1443 ec
->global_lock
= tmp
;
1444 ec
->handle
= handle
;
1445 return AE_CTRL_TERMINATE
;
1448 static bool install_gpe_event_handler(struct acpi_ec
*ec
)
1452 status
= acpi_install_gpe_raw_handler(NULL
, ec
->gpe
,
1453 ACPI_GPE_EDGE_TRIGGERED
,
1454 &acpi_ec_gpe_handler
, ec
);
1455 if (ACPI_FAILURE(status
))
1458 if (test_bit(EC_FLAGS_STARTED
, &ec
->flags
) && ec
->reference_count
>= 1)
1459 acpi_ec_enable_gpe(ec
, true);
1464 static bool install_gpio_irq_event_handler(struct acpi_ec
*ec
)
1466 return request_threaded_irq(ec
->irq
, NULL
, acpi_ec_irq_handler
,
1467 IRQF_SHARED
| IRQF_ONESHOT
, "ACPI EC", ec
) >= 0;
1471 * ec_install_handlers - Install service callbacks and register query methods.
1473 * @device: ACPI device object corresponding to @ec.
1474 * @call_reg: If _REG should be called to notify OpRegion availability
1476 * Install a handler for the EC address space type unless it has been installed
1477 * already. If @device is not NULL, also look for EC query methods in the
1478 * namespace and register them, and install an event (either GPE or GPIO IRQ)
1479 * handler for the EC, if possible.
1482 * -ENODEV if the address space handler cannot be installed, which means
1483 * "unable to handle transactions",
1484 * -EPROBE_DEFER if GPIO IRQ acquisition needs to be deferred,
1485 * or 0 (success) otherwise.
1487 static int ec_install_handlers(struct acpi_ec
*ec
, struct acpi_device
*device
,
1490 acpi_handle scope_handle
= ec
== first_ec
? ACPI_ROOT_OBJECT
: ec
->handle
;
1493 acpi_ec_start(ec
, false);
1495 if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED
, &ec
->flags
)) {
1496 acpi_ec_enter_noirq(ec
);
1497 status
= acpi_install_address_space_handler_no_reg(scope_handle
,
1499 &acpi_ec_space_handler
,
1501 if (ACPI_FAILURE(status
)) {
1502 acpi_ec_stop(ec
, false);
1505 set_bit(EC_FLAGS_EC_HANDLER_INSTALLED
, &ec
->flags
);
1508 if (call_reg
&& !test_bit(EC_FLAGS_EC_REG_CALLED
, &ec
->flags
)) {
1509 acpi_execute_reg_methods(scope_handle
, ACPI_ADR_SPACE_EC
);
1510 if (scope_handle
!= ec
->handle
)
1511 acpi_execute_orphan_reg_method(ec
->handle
, ACPI_ADR_SPACE_EC
);
1513 set_bit(EC_FLAGS_EC_REG_CALLED
, &ec
->flags
);
1520 /* ACPI reduced hardware platforms use a GpioInt from _CRS. */
1521 int irq
= acpi_dev_gpio_irq_get(device
, 0);
1523 * Bail out right away for deferred probing or complete the
1524 * initialization regardless of any other errors.
1526 if (irq
== -EPROBE_DEFER
)
1527 return -EPROBE_DEFER
;
1532 if (!test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED
, &ec
->flags
)) {
1533 /* Find and register all query methods */
1534 acpi_walk_namespace(ACPI_TYPE_METHOD
, ec
->handle
, 1,
1535 acpi_ec_register_query_methods
,
1537 set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED
, &ec
->flags
);
1539 if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
)) {
1543 ready
= install_gpe_event_handler(ec
);
1544 else if (ec
->irq
>= 0)
1545 ready
= install_gpio_irq_event_handler(ec
);
1548 set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
);
1549 acpi_ec_leave_noirq(ec
);
1552 * Failures to install an event handler are not fatal, because
1553 * the EC can be polled for events.
1556 /* EC is fully operational, allow queries */
1557 acpi_ec_enable_event(ec
);
1562 static void ec_remove_handlers(struct acpi_ec
*ec
)
1564 acpi_handle scope_handle
= ec
== first_ec
? ACPI_ROOT_OBJECT
: ec
->handle
;
1566 if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED
, &ec
->flags
)) {
1567 if (ACPI_FAILURE(acpi_remove_address_space_handler(
1570 &acpi_ec_space_handler
)))
1571 pr_err("failed to remove space handler\n");
1572 clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED
, &ec
->flags
);
1576 * Stops handling the EC transactions after removing the operation
1577 * region handler. This is required because _REG(DISCONNECT)
1578 * invoked during the removal can result in new EC transactions.
1580 * Flushes the EC requests and thus disables the GPE before
1581 * removing the GPE handler. This is required by the current ACPICA
1582 * GPE core. ACPICA GPE core will automatically disable a GPE when
1583 * it is indicated but there is no way to handle it. So the drivers
1584 * must disable the GPEs prior to removing the GPE handlers.
1586 acpi_ec_stop(ec
, false);
1588 if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
)) {
1590 ACPI_FAILURE(acpi_remove_gpe_handler(NULL
, ec
->gpe
,
1591 &acpi_ec_gpe_handler
)))
1592 pr_err("failed to remove gpe handler\n");
1595 free_irq(ec
->irq
, ec
);
1597 clear_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
);
1599 if (test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED
, &ec
->flags
)) {
1600 acpi_ec_remove_query_handlers(ec
, true, 0);
1601 clear_bit(EC_FLAGS_QUERY_METHODS_INSTALLED
, &ec
->flags
);
1605 static int acpi_ec_setup(struct acpi_ec
*ec
, struct acpi_device
*device
, bool call_reg
)
1609 /* First EC capable of handling transactions */
1613 ret
= ec_install_handlers(ec
, device
, call_reg
);
1621 pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec
->command_addr
,
1624 if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED
, &ec
->flags
)) {
1626 pr_info("GPE=0x%x\n", ec
->gpe
);
1628 pr_info("IRQ=%d\n", ec
->irq
);
1634 static int acpi_ec_add(struct acpi_device
*device
)
1639 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
1640 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
1642 if (boot_ec
&& (boot_ec
->handle
== device
->handle
||
1643 !strcmp(acpi_device_hid(device
), ACPI_ECDT_HID
))) {
1644 /* Fast path: this device corresponds to the boot EC. */
1649 ec
= acpi_ec_alloc();
1653 status
= ec_parse_device(device
->handle
, 0, ec
, NULL
);
1654 if (status
!= AE_CTRL_TERMINATE
) {
1659 if (boot_ec
&& ec
->command_addr
== boot_ec
->command_addr
&&
1660 ec
->data_addr
== boot_ec
->data_addr
) {
1662 * Trust PNP0C09 namespace location rather than ECDT ID.
1663 * But trust ECDT GPE rather than _GPE because of ASUS
1664 * quirks. So do not change boot_ec->gpe to ec->gpe,
1665 * except when the TRUST_DSDT_GPE quirk is set.
1667 boot_ec
->handle
= ec
->handle
;
1669 if (EC_FLAGS_TRUST_DSDT_GPE
)
1670 boot_ec
->gpe
= ec
->gpe
;
1672 acpi_handle_debug(ec
->handle
, "duplicated.\n");
1678 ret
= acpi_ec_setup(ec
, device
, true);
1683 acpi_handle_info(boot_ec
->handle
,
1684 "Boot %s EC initialization complete\n",
1685 boot_ec_is_ecdt
? "ECDT" : "DSDT");
1687 acpi_handle_info(ec
->handle
,
1688 "EC: Used to handle transactions and events\n");
1690 device
->driver_data
= ec
;
1692 ret
= !!request_region(ec
->data_addr
, 1, "EC data");
1693 WARN(!ret
, "Could not request EC data io port 0x%lx", ec
->data_addr
);
1694 ret
= !!request_region(ec
->command_addr
, 1, "EC cmd");
1695 WARN(!ret
, "Could not request EC cmd io port 0x%lx", ec
->command_addr
);
1697 /* Reprobe devices depending on the EC */
1698 acpi_dev_clear_dependencies(device
);
1700 acpi_handle_debug(ec
->handle
, "enumerated.\n");
1710 static void acpi_ec_remove(struct acpi_device
*device
)
1717 ec
= acpi_driver_data(device
);
1718 release_region(ec
->data_addr
, 1);
1719 release_region(ec
->command_addr
, 1);
1720 device
->driver_data
= NULL
;
1721 if (ec
!= boot_ec
) {
1722 ec_remove_handlers(ec
);
1728 ec_parse_io_ports(struct acpi_resource
*resource
, void *context
)
1730 struct acpi_ec
*ec
= context
;
1732 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
)
1736 * The first address region returned is the data port, and
1737 * the second address region returned is the status/command
1740 if (ec
->data_addr
== 0)
1741 ec
->data_addr
= resource
->data
.io
.minimum
;
1742 else if (ec
->command_addr
== 0)
1743 ec
->command_addr
= resource
->data
.io
.minimum
;
1745 return AE_CTRL_TERMINATE
;
1750 static const struct acpi_device_id ec_device_ids
[] = {
1757 * This function is not Windows-compatible as Windows never enumerates the
1758 * namespace EC before the main ACPI device enumeration process. It is
1759 * retained for historical reason and will be deprecated in the future.
1761 void __init
acpi_ec_dsdt_probe(void)
1768 * If a platform has ECDT, there is no need to proceed as the
1769 * following probe is not a part of the ACPI device enumeration,
1770 * executing _STA is not safe, and thus this probe may risk of
1771 * picking up an invalid EC device.
1776 ec
= acpi_ec_alloc();
1781 * At this point, the namespace is initialized, so start to find
1782 * the namespace objects.
1784 status
= acpi_get_devices(ec_device_ids
[0].id
, ec_parse_device
, ec
, NULL
);
1785 if (ACPI_FAILURE(status
) || !ec
->handle
) {
1791 * When the DSDT EC is available, always re-configure boot EC to
1792 * have _REG evaluated. _REG can only be evaluated after the
1793 * namespace initialization.
1794 * At this point, the GPE is not fully initialized, so do not to
1795 * handle the events.
1797 ret
= acpi_ec_setup(ec
, NULL
, true);
1805 acpi_handle_info(ec
->handle
,
1806 "Boot DSDT EC used to handle transactions\n");
1810 * acpi_ec_ecdt_start - Finalize the boot ECDT EC initialization.
1812 * First, look for an ACPI handle for the boot ECDT EC if acpi_ec_add() has not
1813 * found a matching object in the namespace.
1815 * Next, in case the DSDT EC is not functioning, it is still necessary to
1816 * provide a functional ECDT EC to handle events, so add an extra device object
1817 * to represent it (see https://bugzilla.kernel.org/show_bug.cgi?id=115021).
1819 * This is useful on platforms with valid ECDT and invalid DSDT EC settings,
1820 * like ASUS X550ZE (see https://bugzilla.kernel.org/show_bug.cgi?id=196847).
1822 static void __init
acpi_ec_ecdt_start(void)
1824 struct acpi_table_ecdt
*ecdt_ptr
;
1828 /* Bail out if a matching EC has been found in the namespace. */
1829 if (!boot_ec
|| boot_ec
->handle
!= ACPI_ROOT_OBJECT
)
1832 /* Look up the object pointed to from the ECDT in the namespace. */
1833 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
1834 (struct acpi_table_header
**)&ecdt_ptr
);
1835 if (ACPI_FAILURE(status
))
1838 status
= acpi_get_handle(NULL
, ecdt_ptr
->id
, &handle
);
1839 if (ACPI_SUCCESS(status
)) {
1840 boot_ec
->handle
= handle
;
1842 /* Add a special ACPI device object to represent the boot EC. */
1843 acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC
);
1846 acpi_put_table((struct acpi_table_header
*)ecdt_ptr
);
1850 * On some hardware it is necessary to clear events accumulated by the EC during
1851 * sleep. These ECs stop reporting GPEs until they are manually polled, if too
1852 * many events are accumulated. (e.g. Samsung Series 5/9 notebooks)
1854 * https://bugzilla.kernel.org/show_bug.cgi?id=44161
1856 * Ideally, the EC should also be instructed NOT to accumulate events during
1857 * sleep (which Windows seems to do somehow), but the interface to control this
1858 * behaviour is not known at this time.
1860 * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx,
1861 * however it is very likely that other Samsung models are affected.
1863 * On systems which don't accumulate _Q events during sleep, this extra check
1864 * should be harmless.
1866 static int ec_clear_on_resume(const struct dmi_system_id
*id
)
1868 pr_debug("Detected system needing EC poll on resume.\n");
1869 EC_FLAGS_CLEAR_ON_RESUME
= 1;
1870 ec_event_clearing
= ACPI_EC_EVT_TIMING_STATUS
;
1875 * Some ECDTs contain wrong register addresses.
1877 * https://bugzilla.kernel.org/show_bug.cgi?id=12461
1879 static int ec_correct_ecdt(const struct dmi_system_id
*id
)
1881 pr_debug("Detected system needing ECDT address correction.\n");
1882 EC_FLAGS_CORRECT_ECDT
= 1;
1887 * Some ECDTs contain wrong GPE setting, but they share the same port addresses
1888 * with DSDT EC, don't duplicate the DSDT EC with ECDT EC in this case.
1889 * https://bugzilla.kernel.org/show_bug.cgi?id=209989
1891 static int ec_honor_dsdt_gpe(const struct dmi_system_id
*id
)
1893 pr_debug("Detected system needing DSDT GPE setting.\n");
1894 EC_FLAGS_TRUST_DSDT_GPE
= 1;
1898 static const struct dmi_system_id ec_dmi_table
[] __initconst
= {
1902 * https://bugzilla.kernel.org/show_bug.cgi?id=12461
1904 .callback
= ec_correct_ecdt
,
1906 DMI_MATCH(DMI_SYS_VENDOR
, "Micro-Star"),
1907 DMI_MATCH(DMI_PRODUCT_NAME
, "MS-171F"),
1912 * HP Pavilion Gaming Laptop 15-cx0xxx
1913 * https://bugzilla.kernel.org/show_bug.cgi?id=209989
1915 .callback
= ec_honor_dsdt_gpe
,
1917 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
1918 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion Gaming Laptop 15-cx0xxx"),
1923 * HP Pavilion Gaming Laptop 15-cx0041ur
1925 .callback
= ec_honor_dsdt_gpe
,
1927 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
1928 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 15-cx0041ur"),
1933 * HP Pavilion Gaming Laptop 15-dk1xxx
1934 * https://github.com/systemd/systemd/issues/28942
1936 .callback
= ec_honor_dsdt_gpe
,
1938 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
1939 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion Gaming Laptop 15-dk1xxx"),
1944 * HP 250 G7 Notebook PC
1946 .callback
= ec_honor_dsdt_gpe
,
1948 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
1949 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 250 G7 Notebook PC"),
1955 * https://bugzilla.kernel.org/show_bug.cgi?id=44161
1957 .callback
= ec_clear_on_resume
,
1959 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
1965 void __init
acpi_ec_ecdt_probe(void)
1967 struct acpi_table_ecdt
*ecdt_ptr
;
1972 /* Generate a boot ec context. */
1973 dmi_check_system(ec_dmi_table
);
1974 status
= acpi_get_table(ACPI_SIG_ECDT
, 1,
1975 (struct acpi_table_header
**)&ecdt_ptr
);
1976 if (ACPI_FAILURE(status
))
1979 if (!ecdt_ptr
->control
.address
|| !ecdt_ptr
->data
.address
) {
1982 * https://bugzilla.kernel.org/show_bug.cgi?id=11880
1987 ec
= acpi_ec_alloc();
1991 if (EC_FLAGS_CORRECT_ECDT
) {
1992 ec
->command_addr
= ecdt_ptr
->data
.address
;
1993 ec
->data_addr
= ecdt_ptr
->control
.address
;
1995 ec
->command_addr
= ecdt_ptr
->control
.address
;
1996 ec
->data_addr
= ecdt_ptr
->data
.address
;
2000 * Ignore the GPE value on Reduced Hardware platforms.
2001 * Some products have this set to an erroneous value.
2003 if (!acpi_gbl_reduced_hardware
)
2004 ec
->gpe
= ecdt_ptr
->gpe
;
2006 ec
->handle
= ACPI_ROOT_OBJECT
;
2009 * At this point, the namespace is not initialized, so do not find
2010 * the namespace objects, or handle the events.
2012 ret
= acpi_ec_setup(ec
, NULL
, false);
2019 boot_ec_is_ecdt
= true;
2021 pr_info("Boot ECDT EC used to handle transactions\n");
2024 acpi_put_table((struct acpi_table_header
*)ecdt_ptr
);
2027 #ifdef CONFIG_PM_SLEEP
2028 static int acpi_ec_suspend(struct device
*dev
)
2030 struct acpi_ec
*ec
=
2031 acpi_driver_data(to_acpi_device(dev
));
2033 if (!pm_suspend_no_platform() && ec_freeze_events
)
2034 acpi_ec_disable_event(ec
);
2038 static int acpi_ec_suspend_noirq(struct device
*dev
)
2040 struct acpi_ec
*ec
= acpi_driver_data(to_acpi_device(dev
));
2043 * The SCI handler doesn't run at this point, so the GPE can be
2044 * masked at the low level without side effects.
2046 if (ec_no_wakeup
&& test_bit(EC_FLAGS_STARTED
, &ec
->flags
) &&
2047 ec
->gpe
>= 0 && ec
->reference_count
>= 1)
2048 acpi_set_gpe(NULL
, ec
->gpe
, ACPI_GPE_DISABLE
);
2050 acpi_ec_enter_noirq(ec
);
2055 static int acpi_ec_resume_noirq(struct device
*dev
)
2057 struct acpi_ec
*ec
= acpi_driver_data(to_acpi_device(dev
));
2059 acpi_ec_leave_noirq(ec
);
2061 if (ec_no_wakeup
&& test_bit(EC_FLAGS_STARTED
, &ec
->flags
) &&
2062 ec
->gpe
>= 0 && ec
->reference_count
>= 1)
2063 acpi_set_gpe(NULL
, ec
->gpe
, ACPI_GPE_ENABLE
);
2068 static int acpi_ec_resume(struct device
*dev
)
2070 struct acpi_ec
*ec
=
2071 acpi_driver_data(to_acpi_device(dev
));
2073 acpi_ec_enable_event(ec
);
2077 void acpi_ec_mark_gpe_for_wake(void)
2079 if (first_ec
&& !ec_no_wakeup
)
2080 acpi_mark_gpe_for_wake(NULL
, first_ec
->gpe
);
2082 EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake
);
2084 void acpi_ec_set_gpe_wake_mask(u8 action
)
2086 if (pm_suspend_no_platform() && first_ec
&& !ec_no_wakeup
)
2087 acpi_set_gpe_wake_mask(NULL
, first_ec
->gpe
, action
);
2090 static bool acpi_ec_work_in_progress(struct acpi_ec
*ec
)
2092 return ec
->events_in_progress
+ ec
->queries_in_progress
> 0;
2095 bool acpi_ec_dispatch_gpe(void)
2097 bool work_in_progress
= false;
2100 return acpi_any_gpe_status_set(U32_MAX
);
2103 * Report wakeup if the status bit is set for any enabled GPE other
2106 if (acpi_any_gpe_status_set(first_ec
->gpe
))
2110 * Cancel the SCI wakeup and process all pending events in case there
2111 * are any wakeup ones in there.
2113 * Note that if any non-EC GPEs are active at this point, the SCI will
2114 * retrigger after the rearming in acpi_s2idle_wake(), so no events
2115 * should be missed by canceling the wakeup here.
2117 pm_system_cancel_wakeup();
2120 * Dispatch the EC GPE in-band, but do not report wakeup in any case
2121 * to allow the caller to process events properly after that.
2123 spin_lock_irq(&first_ec
->lock
);
2125 if (acpi_ec_gpe_status_set(first_ec
)) {
2126 pm_pr_dbg("ACPI EC GPE status set\n");
2128 clear_gpe_and_advance_transaction(first_ec
, false);
2129 work_in_progress
= acpi_ec_work_in_progress(first_ec
);
2132 spin_unlock_irq(&first_ec
->lock
);
2134 if (!work_in_progress
)
2137 pm_pr_dbg("ACPI EC GPE dispatched\n");
2139 /* Drain EC work. */
2141 acpi_ec_flush_work();
2143 pm_pr_dbg("ACPI EC work flushed\n");
2145 spin_lock_irq(&first_ec
->lock
);
2147 work_in_progress
= acpi_ec_work_in_progress(first_ec
);
2149 spin_unlock_irq(&first_ec
->lock
);
2150 } while (work_in_progress
&& !pm_wakeup_pending());
2154 #endif /* CONFIG_PM_SLEEP */
2156 static const struct dev_pm_ops acpi_ec_pm
= {
2157 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq
, acpi_ec_resume_noirq
)
2158 SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend
, acpi_ec_resume
)
2161 static int param_set_event_clearing(const char *val
,
2162 const struct kernel_param
*kp
)
2166 if (!strncmp(val
, "status", sizeof("status") - 1)) {
2167 ec_event_clearing
= ACPI_EC_EVT_TIMING_STATUS
;
2168 pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n");
2169 } else if (!strncmp(val
, "query", sizeof("query") - 1)) {
2170 ec_event_clearing
= ACPI_EC_EVT_TIMING_QUERY
;
2171 pr_info("Assuming SCI_EVT clearing on QR_EC writes\n");
2172 } else if (!strncmp(val
, "event", sizeof("event") - 1)) {
2173 ec_event_clearing
= ACPI_EC_EVT_TIMING_EVENT
;
2174 pr_info("Assuming SCI_EVT clearing on event reads\n");
2180 static int param_get_event_clearing(char *buffer
,
2181 const struct kernel_param
*kp
)
2183 switch (ec_event_clearing
) {
2184 case ACPI_EC_EVT_TIMING_STATUS
:
2185 return sprintf(buffer
, "status\n");
2186 case ACPI_EC_EVT_TIMING_QUERY
:
2187 return sprintf(buffer
, "query\n");
2188 case ACPI_EC_EVT_TIMING_EVENT
:
2189 return sprintf(buffer
, "event\n");
2191 return sprintf(buffer
, "invalid\n");
2196 module_param_call(ec_event_clearing
, param_set_event_clearing
, param_get_event_clearing
,
2198 MODULE_PARM_DESC(ec_event_clearing
, "Assumed SCI_EVT clearing timing");
2200 static struct acpi_driver acpi_ec_driver
= {
2202 .class = ACPI_EC_CLASS
,
2203 .ids
= ec_device_ids
,
2206 .remove
= acpi_ec_remove
,
2208 .drv
.pm
= &acpi_ec_pm
,
2211 static void acpi_ec_destroy_workqueues(void)
2214 destroy_workqueue(ec_wq
);
2218 destroy_workqueue(ec_query_wq
);
2223 static int acpi_ec_init_workqueues(void)
2226 ec_wq
= alloc_ordered_workqueue("kec", 0);
2229 ec_query_wq
= alloc_workqueue("kec_query", 0, ec_max_queries
);
2231 if (!ec_wq
|| !ec_query_wq
) {
2232 acpi_ec_destroy_workqueues();
2238 static const struct dmi_system_id acpi_ec_no_wakeup
[] = {
2241 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
2242 DMI_MATCH(DMI_PRODUCT_FAMILY
, "Thinkpad X1 Carbon 6th"),
2247 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
2248 DMI_MATCH(DMI_PRODUCT_FAMILY
, "ThinkPad X1 Yoga 3rd"),
2253 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
2254 DMI_MATCH(DMI_PRODUCT_FAMILY
, "103C_5336AN HP ZHAN 66 Pro"),
2260 void __init
acpi_ec_init(void)
2264 result
= acpi_ec_init_workqueues();
2269 * Disable EC wakeup on following systems to prevent periodic
2270 * wakeup from EC GPE.
2272 if (dmi_check_system(acpi_ec_no_wakeup
)) {
2273 ec_no_wakeup
= true;
2274 pr_debug("Disabling EC wakeup on suspend-to-idle\n");
2277 /* Driver must be registered after acpi_ec_init_workqueues(). */
2278 acpi_bus_register_driver(&acpi_ec_driver
);
2280 acpi_ec_ecdt_start();
2283 /* EC driver currently not unloadable */
2285 static void __exit
acpi_ec_exit(void)
2288 acpi_bus_unregister_driver(&acpi_ec_driver
);
2289 acpi_ec_destroy_workqueues();