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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
a8d4fc22 | 3 | * ec.c - ACPI Embedded Controller Driver (v3) |
1da177e4 | 4 | * |
a8d4fc22 LZ |
5 | * Copyright (C) 2001-2015 Intel Corporation |
6 | * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> | |
4a3f6b5b LZ |
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> | |
1da177e4 LT |
13 | */ |
14 | ||
7c6db4e0 | 15 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 16 | /* #define DEBUG */ |
b6aeab44 | 17 | #define pr_fmt(fmt) "ACPI: EC: " fmt |
d772b3b3 | 18 | |
1da177e4 LT |
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> | |
451566f4 | 24 | #include <linux/interrupt.h> |
837012ed | 25 | #include <linux/list.h> |
7c6db4e0 | 26 | #include <linux/spinlock.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
10a08fd6 | 28 | #include <linux/suspend.h> |
8b48463f | 29 | #include <linux/acpi.h> |
eb27cae8 | 30 | #include <linux/dmi.h> |
8b48463f | 31 | #include <asm/io.h> |
1da177e4 | 32 | |
1195a098 TR |
33 | #include "internal.h" |
34 | ||
1da177e4 | 35 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 | 36 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
837012ed | 37 | |
703959d4 | 38 | /* EC status register */ |
1da177e4 LT |
39 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
40 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 41 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 42 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 43 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 44 | |
1d68d261 LZ |
45 | /* |
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 | |
49 | * perspective): | |
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 | |
65 | * register (EC_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. | |
72 | */ | |
73 | #define ACPI_EC_EVT_TIMING_STATUS 0x00 | |
74 | #define ACPI_EC_EVT_TIMING_QUERY 0x01 | |
75 | #define ACPI_EC_EVT_TIMING_EVENT 0x02 | |
76 | ||
703959d4 | 77 | /* EC commands */ |
3261ff4d | 78 | enum ec_command { |
6ccedb10 AS |
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, | |
3261ff4d | 84 | }; |
837012ed | 85 | |
5c406412 | 86 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 87 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
d8d031a6 | 88 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
ad332c8a KC |
89 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
90 | * when trying to clear the EC */ | |
e1191bd4 | 91 | #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */ |
703959d4 | 92 | |
080e412c | 93 | enum { |
750f628b | 94 | EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ |
4446abc9 | 95 | EC_FLAGS_EVENT_HANDLER_INSTALLED, /* Event handler installed */ |
0e1affe4 | 96 | EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ |
ab4620f5 | 97 | EC_FLAGS_EC_REG_CALLED, /* OpReg ACPI _REG method called */ |
4446abc9 | 98 | EC_FLAGS_QUERY_METHODS_INSTALLED, /* _Qxx handlers installed */ |
ad479e7f LZ |
99 | EC_FLAGS_STARTED, /* Driver is started */ |
100 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
4446abc9 | 101 | EC_FLAGS_EVENTS_MASKED, /* Events masked */ |
1da177e4 | 102 | }; |
6ffb221a | 103 | |
f92fca00 LZ |
104 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
105 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
106 | ||
7a18e96d TR |
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"); | |
111 | ||
e1191bd4 LZ |
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"); | |
115 | ||
15de603b LZ |
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"); | |
119 | ||
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"); | |
123 | ||
3cb02aeb | 124 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
1d68d261 | 125 | |
a520d52e FT |
126 | /* |
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. | |
130 | */ | |
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"); | |
134 | ||
69cace6e | 135 | static bool ec_freeze_events __read_mostly; |
39a2a2aa LZ |
136 | module_param(ec_freeze_events, bool, 0644); |
137 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); | |
138 | ||
76380636 RW |
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"); | |
142 | ||
837012ed AS |
143 | struct acpi_ec_query_handler { |
144 | struct list_head node; | |
145 | acpi_ec_query_func func; | |
146 | acpi_handle handle; | |
147 | void *data; | |
148 | u8 query_bit; | |
01305d41 | 149 | struct kref kref; |
837012ed AS |
150 | }; |
151 | ||
8463200a | 152 | struct transaction { |
7c6db4e0 AS |
153 | const u8 *wdata; |
154 | u8 *rdata; | |
155 | unsigned short irq_count; | |
8463200a | 156 | u8 command; |
a2f93aea AS |
157 | u8 wi; |
158 | u8 ri; | |
7c6db4e0 AS |
159 | u8 wlen; |
160 | u8 rlen; | |
f92fca00 | 161 | u8 flags; |
7c6db4e0 AS |
162 | }; |
163 | ||
02b771b6 LZ |
164 | struct acpi_ec_query { |
165 | struct transaction transaction; | |
166 | struct work_struct work; | |
167 | struct acpi_ec_query_handler *handler; | |
4a9af6ca | 168 | struct acpi_ec *ec; |
02b771b6 LZ |
169 | }; |
170 | ||
eafe7509 | 171 | static int acpi_ec_submit_query(struct acpi_ec *ec); |
9aa60f3c | 172 | static void advance_transaction(struct acpi_ec *ec, bool interrupt); |
02b771b6 | 173 | static void acpi_ec_event_handler(struct work_struct *work); |
74443bbe | 174 | |
a9c30768 | 175 | struct acpi_ec *first_ec; |
1195a098 | 176 | EXPORT_SYMBOL(first_ec); |
a9c30768 RW |
177 | |
178 | static struct acpi_ec *boot_ec; | |
69cace6e | 179 | static bool boot_ec_is_ecdt; |
f0ac20c3 | 180 | static struct workqueue_struct *ec_wq; |
e1191bd4 | 181 | static struct workqueue_struct *ec_query_wq; |
703959d4 | 182 | |
59f0aa94 | 183 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
4370cbf3 | 184 | static int EC_FLAGS_TRUST_DSDT_GPE; /* Needs DSDT GPE as correction setting */ |
b6a3e147 | 185 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
5423a0cb | 186 | |
3535a3c1 LZ |
187 | /* -------------------------------------------------------------------------- |
188 | * Logging/Debugging | |
189 | * -------------------------------------------------------------------------- */ | |
190 | ||
191 | /* | |
192 | * Splitters used by the developers to track the boundary of the EC | |
193 | * handling processes. | |
194 | */ | |
195 | #ifdef DEBUG | |
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 "#####" | |
201 | #else | |
202 | #define EC_DBG_SEP "" | |
203 | #define EC_DBG_DRV | |
204 | #define EC_DBG_STM | |
205 | #define EC_DBG_REQ | |
206 | #define EC_DBG_EVT | |
207 | #endif | |
208 | ||
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__) | |
217 | ||
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__) | |
770970f0 LZ |
228 | #define ec_dbg_ref(ec, fmt, ...) \ |
229 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 230 | |
ad479e7f LZ |
231 | /* -------------------------------------------------------------------------- |
232 | * Device Flags | |
233 | * -------------------------------------------------------------------------- */ | |
234 | ||
235 | static bool acpi_ec_started(struct acpi_ec *ec) | |
236 | { | |
237 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
238 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
239 | } | |
240 | ||
750f628b LZ |
241 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
242 | { | |
243 | /* | |
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. | |
247 | */ | |
248 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
249 | return false; | |
250 | /* | |
39a2a2aa LZ |
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 | |
255 | * the noirq stage. | |
256 | * 2. false: The EC event handling is automatically disabled as | |
257 | * soon as the EC driver is stopped. | |
750f628b | 258 | */ |
39a2a2aa LZ |
259 | if (ec_freeze_events) |
260 | return acpi_ec_started(ec); | |
261 | else | |
262 | return test_bit(EC_FLAGS_STARTED, &ec->flags); | |
750f628b LZ |
263 | } |
264 | ||
9887d22a LZ |
265 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
266 | { | |
267 | return ec->reference_count == 1; | |
268 | } | |
269 | ||
1da177e4 | 270 | /* -------------------------------------------------------------------------- |
ca37bfdf | 271 | * EC Registers |
7a73e60e | 272 | * -------------------------------------------------------------------------- */ |
1da177e4 | 273 | |
6ffb221a | 274 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 275 | { |
3ebe08a7 | 276 | u8 x = inb(ec->command_addr); |
7a73e60e | 277 | |
3535a3c1 LZ |
278 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
279 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
280 | x, | |
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)); | |
3ebe08a7 | 286 | return x; |
451566f4 DT |
287 | } |
288 | ||
6ffb221a | 289 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 290 | { |
3ebe08a7 | 291 | u8 x = inb(ec->data_addr); |
7a73e60e | 292 | |
d8d031a6 | 293 | ec->timestamp = jiffies; |
3535a3c1 | 294 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 295 | return x; |
7c6db5e5 DS |
296 | } |
297 | ||
6ffb221a | 298 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 299 | { |
3535a3c1 | 300 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 301 | outb(command, ec->command_addr); |
d8d031a6 | 302 | ec->timestamp = jiffies; |
45bea155 LY |
303 | } |
304 | ||
6ffb221a | 305 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 306 | { |
3535a3c1 | 307 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 308 | outb(data, ec->data_addr); |
d8d031a6 | 309 | ec->timestamp = jiffies; |
703959d4 | 310 | } |
45bea155 | 311 | |
4625d752 | 312 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
e34c0e2b LZ |
313 | static const char *acpi_ec_cmd_string(u8 cmd) |
314 | { | |
315 | switch (cmd) { | |
316 | case 0x80: | |
317 | return "RD_EC"; | |
318 | case 0x81: | |
319 | return "WR_EC"; | |
320 | case 0x82: | |
321 | return "BE_EC"; | |
322 | case 0x83: | |
323 | return "BD_EC"; | |
324 | case 0x84: | |
325 | return "QR_EC"; | |
326 | } | |
327 | return "UNKNOWN"; | |
328 | } | |
329 | #else | |
330 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
331 | #endif | |
332 | ||
ca37bfdf LZ |
333 | /* -------------------------------------------------------------------------- |
334 | * GPE Registers | |
335 | * -------------------------------------------------------------------------- */ | |
336 | ||
d2a2e6cc | 337 | static inline bool acpi_ec_gpe_status_set(struct acpi_ec *ec) |
ca37bfdf LZ |
338 | { |
339 | acpi_event_status gpe_status = 0; | |
340 | ||
341 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
d2a2e6cc | 342 | return !!(gpe_status & ACPI_EVENT_FLAG_STATUS_SET); |
ca37bfdf LZ |
343 | } |
344 | ||
345 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
346 | { | |
347 | if (open) | |
348 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
349 | else { |
350 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 351 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 352 | } |
d2a2e6cc | 353 | if (acpi_ec_gpe_status_set(ec)) { |
ca37bfdf LZ |
354 | /* |
355 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
356 | * software need to manually trigger a pseudo GPE event on | |
357 | * EN=1 writes. | |
358 | */ | |
3535a3c1 | 359 | ec_dbg_raw("Polling quirk"); |
2e84ea5a | 360 | advance_transaction(ec, false); |
ca37bfdf LZ |
361 | } |
362 | } | |
363 | ||
364 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
365 | { | |
366 | if (close) | |
367 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
368 | else { |
369 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 370 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 371 | } |
ca37bfdf LZ |
372 | } |
373 | ||
ca37bfdf LZ |
374 | /* -------------------------------------------------------------------------- |
375 | * Transaction Management | |
376 | * -------------------------------------------------------------------------- */ | |
377 | ||
9887d22a LZ |
378 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
379 | { | |
380 | ec->reference_count++; | |
4446abc9 | 381 | if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && |
406857f7 | 382 | ec->gpe >= 0 && ec->reference_count == 1) |
9887d22a LZ |
383 | acpi_ec_enable_gpe(ec, true); |
384 | } | |
385 | ||
386 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
387 | { | |
388 | bool flushed = false; | |
389 | ||
390 | ec->reference_count--; | |
4446abc9 | 391 | if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && |
406857f7 | 392 | ec->gpe >= 0 && ec->reference_count == 0) |
9887d22a LZ |
393 | acpi_ec_disable_gpe(ec, true); |
394 | flushed = acpi_ec_flushed(ec); | |
395 | if (flushed) | |
396 | wake_up(&ec->wait); | |
397 | } | |
398 | ||
4446abc9 | 399 | static void acpi_ec_mask_events(struct acpi_ec *ec) |
e1d4d90f | 400 | { |
4446abc9 | 401 | if (!test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { |
406857f7 DD |
402 | if (ec->gpe >= 0) |
403 | acpi_ec_disable_gpe(ec, false); | |
404 | else | |
405 | disable_irq_nosync(ec->irq); | |
406 | ||
3535a3c1 | 407 | ec_dbg_drv("Polling enabled"); |
4446abc9 | 408 | set_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); |
e1d4d90f LZ |
409 | } |
410 | } | |
411 | ||
4446abc9 | 412 | static void acpi_ec_unmask_events(struct acpi_ec *ec) |
e1d4d90f | 413 | { |
4446abc9 DD |
414 | if (test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { |
415 | clear_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); | |
406857f7 DD |
416 | if (ec->gpe >= 0) |
417 | acpi_ec_enable_gpe(ec, false); | |
418 | else | |
419 | enable_irq(ec->irq); | |
420 | ||
3535a3c1 | 421 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
422 | } |
423 | } | |
424 | ||
9887d22a LZ |
425 | /* |
426 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
427 | * the flush operation is not in | |
428 | * progress | |
429 | * @ec: the EC device | |
430 | * | |
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 | |
434 | * completed. | |
435 | */ | |
37d11391 | 436 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 437 | { |
37d11391 RW |
438 | if (!acpi_ec_started(ec)) |
439 | return false; | |
9887d22a LZ |
440 | acpi_ec_submit_request(ec); |
441 | return true; | |
442 | } | |
443 | ||
9aa60f3c | 444 | static void acpi_ec_submit_event(struct acpi_ec *ec) |
74443bbe | 445 | { |
9aa60f3c RW |
446 | /* |
447 | * It is safe to mask the events here, because acpi_ec_close_event() | |
448 | * will run at least once after this. | |
449 | */ | |
4446abc9 | 450 | acpi_ec_mask_events(ec); |
1ab69f27 | 451 | if (!acpi_ec_event_enabled(ec)) |
9aa60f3c | 452 | return; |
ca8283dc | 453 | |
54b86141 RW |
454 | if (ec->event_state != EC_EVENT_READY) |
455 | return; | |
c33676aa | 456 | |
54b86141 RW |
457 | ec_dbg_evt("Command(%s) submitted/blocked", |
458 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c793570d | 459 | |
54b86141 RW |
460 | ec->event_state = EC_EVENT_IN_PROGRESS; |
461 | /* | |
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 | |
466 | * same loop again. | |
467 | */ | |
468 | if (ec->events_to_process++ > 0) | |
469 | return; | |
470 | ||
471 | ec->events_in_progress++; | |
472 | queue_work(ec_wq, &ec->work); | |
74443bbe LZ |
473 | } |
474 | ||
c33676aa RW |
475 | static void acpi_ec_complete_event(struct acpi_ec *ec) |
476 | { | |
477 | if (ec->event_state == EC_EVENT_IN_PROGRESS) | |
478 | ec->event_state = EC_EVENT_COMPLETE; | |
479 | } | |
480 | ||
eafe7509 | 481 | static void acpi_ec_close_event(struct acpi_ec *ec) |
74443bbe | 482 | { |
c33676aa | 483 | if (ec->event_state != EC_EVENT_READY) |
9d8993be LZ |
484 | ec_dbg_evt("Command(%s) unblocked", |
485 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c33676aa RW |
486 | |
487 | ec->event_state = EC_EVENT_READY; | |
4446abc9 | 488 | acpi_ec_unmask_events(ec); |
74443bbe LZ |
489 | } |
490 | ||
750f628b LZ |
491 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
492 | { | |
493 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
494 | ec_log_drv("event unblocked"); | |
53c5eaab LZ |
495 | /* |
496 | * Unconditionally invoke this once after enabling the event | |
497 | * handling mechanism to detect the pending events. | |
498 | */ | |
2e84ea5a | 499 | advance_transaction(ec, false); |
750f628b LZ |
500 | } |
501 | ||
502 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) | |
503 | { | |
504 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
505 | ec_log_drv("event blocked"); | |
506 | } | |
507 | ||
b6a3e147 ZR |
508 | /* |
509 | * Process _Q events that might have accumulated in the EC. | |
510 | * Run with locked ec mutex. | |
511 | */ | |
512 | static void acpi_ec_clear(struct acpi_ec *ec) | |
513 | { | |
1f235044 | 514 | int i; |
b6a3e147 ZR |
515 | |
516 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
eafe7509 | 517 | if (acpi_ec_submit_query(ec)) |
b6a3e147 ZR |
518 | break; |
519 | } | |
520 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
521 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
522 | else | |
523 | pr_info("%d stale EC events cleared\n", i); | |
524 | } | |
525 | ||
750f628b LZ |
526 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
527 | { | |
e0359f15 RW |
528 | unsigned long flags; |
529 | ||
530 | spin_lock_irqsave(&ec->lock, flags); | |
750f628b LZ |
531 | if (acpi_ec_started(ec)) |
532 | __acpi_ec_enable_event(ec); | |
e0359f15 | 533 | spin_unlock_irqrestore(&ec->lock, flags); |
b6a3e147 ZR |
534 | |
535 | /* Drain additional events if hardware requires that */ | |
536 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
537 | acpi_ec_clear(ec); | |
750f628b LZ |
538 | } |
539 | ||
eab05ec3 | 540 | #ifdef CONFIG_PM_SLEEP |
016b87ca | 541 | static void __acpi_ec_flush_work(void) |
39a2a2aa | 542 | { |
4a9af6ca | 543 | flush_workqueue(ec_wq); /* flush ec->work */ |
016b87ca | 544 | flush_workqueue(ec_query_wq); /* flush queries */ |
39a2a2aa LZ |
545 | } |
546 | ||
547 | static void acpi_ec_disable_event(struct acpi_ec *ec) | |
548 | { | |
e0359f15 RW |
549 | unsigned long flags; |
550 | ||
551 | spin_lock_irqsave(&ec->lock, flags); | |
39a2a2aa | 552 | __acpi_ec_disable_event(ec); |
e0359f15 | 553 | spin_unlock_irqrestore(&ec->lock, flags); |
016b87ca RW |
554 | |
555 | /* | |
556 | * When ec_freeze_events is true, we need to flush events in | |
557 | * the proper position before entering the noirq stage. | |
558 | */ | |
559 | __acpi_ec_flush_work(); | |
39a2a2aa | 560 | } |
880a6627 RW |
561 | |
562 | void acpi_ec_flush_work(void) | |
563 | { | |
f0ac20c3 RW |
564 | /* Without ec_wq there is nothing to flush. */ |
565 | if (!ec_wq) | |
016b87ca | 566 | return; |
880a6627 | 567 | |
016b87ca | 568 | __acpi_ec_flush_work(); |
880a6627 | 569 | } |
eab05ec3 | 570 | #endif /* CONFIG_PM_SLEEP */ |
39a2a2aa | 571 | |
1d68d261 LZ |
572 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
573 | { | |
e0359f15 | 574 | unsigned long flags; |
c33676aa | 575 | bool guarded; |
61197547 | 576 | |
e0359f15 | 577 | spin_lock_irqsave(&ec->lock, flags); |
61197547 LZ |
578 | /* |
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 | |
582 | * acceptable period. | |
583 | * | |
c33676aa RW |
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. | |
61197547 | 589 | */ |
c33676aa RW |
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); | |
e0359f15 | 593 | spin_unlock_irqrestore(&ec->lock, flags); |
61197547 | 594 | return guarded; |
1d68d261 LZ |
595 | } |
596 | ||
d8d031a6 LZ |
597 | static int ec_transaction_polled(struct acpi_ec *ec) |
598 | { | |
e0359f15 | 599 | unsigned long flags; |
d8d031a6 LZ |
600 | int ret = 0; |
601 | ||
e0359f15 | 602 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 LZ |
603 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) |
604 | ret = 1; | |
e0359f15 | 605 | spin_unlock_irqrestore(&ec->lock, flags); |
d8d031a6 LZ |
606 | return ret; |
607 | } | |
608 | ||
f92fca00 | 609 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 610 | { |
e0359f15 | 611 | unsigned long flags; |
7c6db4e0 | 612 | int ret = 0; |
7a73e60e | 613 | |
e0359f15 | 614 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 615 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 616 | ret = 1; |
e0359f15 | 617 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 618 | return ret; |
45bea155 | 619 | } |
451566f4 | 620 | |
f8b8eb71 LZ |
621 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
622 | { | |
623 | ec->curr->flags |= flag; | |
c33676aa RW |
624 | |
625 | if (ec->curr->command != ACPI_EC_COMMAND_QUERY) | |
626 | return; | |
627 | ||
628 | switch (ec_event_clearing) { | |
629 | case ACPI_EC_EVT_TIMING_STATUS: | |
630 | if (flag == ACPI_EC_COMMAND_POLL) | |
eafe7509 | 631 | acpi_ec_close_event(ec); |
c33676aa RW |
632 | |
633 | return; | |
634 | ||
635 | case ACPI_EC_EVT_TIMING_QUERY: | |
636 | if (flag == ACPI_EC_COMMAND_COMPLETE) | |
eafe7509 | 637 | acpi_ec_close_event(ec); |
c33676aa RW |
638 | |
639 | return; | |
640 | ||
641 | case ACPI_EC_EVT_TIMING_EVENT: | |
642 | if (flag == ACPI_EC_COMMAND_COMPLETE) | |
643 | acpi_ec_complete_event(ec); | |
f8b8eb71 LZ |
644 | } |
645 | } | |
646 | ||
631734fc RW |
647 | static void acpi_ec_spurious_interrupt(struct acpi_ec *ec, struct transaction *t) |
648 | { | |
649 | if (t->irq_count < ec_storm_threshold) | |
650 | ++t->irq_count; | |
651 | ||
652 | /* Trigger if the threshold is 0 too. */ | |
653 | if (t->irq_count == ec_storm_threshold) | |
654 | acpi_ec_mask_events(ec); | |
655 | } | |
656 | ||
9aa60f3c | 657 | static void advance_transaction(struct acpi_ec *ec, bool interrupt) |
7c6db5e5 | 658 | { |
902675fa | 659 | struct transaction *t = ec->curr; |
c0d65341 | 660 | bool wakeup = false; |
902675fa | 661 | u8 status; |
b76b51ba | 662 | |
2e84ea5a | 663 | ec_dbg_stm("%s (%d)", interrupt ? "IRQ" : "TASK", smp_processor_id()); |
d269fb03 | 664 | |
66b42b78 | 665 | status = acpi_ec_read_status(ec); |
902675fa | 666 | |
1d68d261 LZ |
667 | /* |
668 | * Another IRQ or a guarded polling mode advancement is detected, | |
669 | * the next QR_EC submission is then allowed. | |
670 | */ | |
671 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { | |
672 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && | |
c33676aa | 673 | ec->event_state == EC_EVENT_COMPLETE) |
eafe7509 | 674 | acpi_ec_close_event(ec); |
c33676aa | 675 | |
902675fa RW |
676 | if (!t) |
677 | goto out; | |
1d68d261 | 678 | } |
902675fa | 679 | |
f92fca00 LZ |
680 | if (t->flags & ACPI_EC_COMMAND_POLL) { |
681 | if (t->wlen > t->wi) { | |
2a39a30f | 682 | if (!(status & ACPI_EC_FLAG_IBF)) |
f92fca00 | 683 | acpi_ec_write_data(ec, t->wdata[t->wi++]); |
631734fc RW |
684 | else if (interrupt && !(status & ACPI_EC_FLAG_SCI)) |
685 | acpi_ec_spurious_interrupt(ec, t); | |
f92fca00 | 686 | } else if (t->rlen > t->ri) { |
2a39a30f | 687 | if (status & ACPI_EC_FLAG_OBF) { |
f92fca00 | 688 | t->rdata[t->ri++] = acpi_ec_read_data(ec); |
c0d65341 | 689 | if (t->rlen == t->ri) { |
f8b8eb71 | 690 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
2a39a30f | 691 | wakeup = true; |
3afcf2ec | 692 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
693 | ec_dbg_evt("Command(%s) completed by hardware", |
694 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 | 695 | } |
631734fc RW |
696 | } else if (interrupt && !(status & ACPI_EC_FLAG_SCI)) { |
697 | acpi_ec_spurious_interrupt(ec, t); | |
698 | } | |
2a39a30f | 699 | } else if (t->wlen == t->wi && !(status & ACPI_EC_FLAG_IBF)) { |
f8b8eb71 | 700 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
701 | wakeup = true; |
702 | } | |
b1e14999 RW |
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); | |
f92fca00 | 706 | } |
902675fa | 707 | |
0c78808f | 708 | out: |
74443bbe | 709 | if (status & ACPI_EC_FLAG_SCI) |
9aa60f3c | 710 | acpi_ec_submit_event(ec); |
2a39a30f | 711 | |
2e84ea5a | 712 | if (wakeup && interrupt) |
0c78808f | 713 | wake_up(&ec->wait); |
f92fca00 | 714 | } |
a3cd8d27 | 715 | |
f92fca00 LZ |
716 | static void start_transaction(struct acpi_ec *ec) |
717 | { | |
718 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
719 | ec->curr->flags = 0; | |
d8d031a6 LZ |
720 | } |
721 | ||
722 | static int ec_guard(struct acpi_ec *ec) | |
723 | { | |
c3a696b6 | 724 | unsigned long guard = usecs_to_jiffies(ec->polling_guard); |
d8d031a6 LZ |
725 | unsigned long timeout = ec->timestamp + guard; |
726 | ||
61197547 | 727 | /* Ensure guarding period before polling EC status */ |
d8d031a6 | 728 | do { |
c3a696b6 | 729 | if (ec->busy_polling) { |
d8d031a6 LZ |
730 | /* Perform busy polling */ |
731 | if (ec_transaction_completed(ec)) | |
732 | return 0; | |
733 | udelay(jiffies_to_usecs(guard)); | |
734 | } else { | |
735 | /* | |
736 | * Perform wait polling | |
61197547 LZ |
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 | |
743 | * state. | |
d8d031a6 | 744 | */ |
1d68d261 LZ |
745 | if (!ec_transaction_polled(ec) && |
746 | !acpi_ec_guard_event(ec)) | |
d8d031a6 LZ |
747 | break; |
748 | if (wait_event_timeout(ec->wait, | |
749 | ec_transaction_completed(ec), | |
750 | guard)) | |
751 | return 0; | |
752 | } | |
d8d031a6 LZ |
753 | } while (time_before(jiffies, timeout)); |
754 | return -ETIME; | |
845625cd | 755 | } |
03d1d99c | 756 | |
7c6db4e0 AS |
757 | static int ec_poll(struct acpi_ec *ec) |
758 | { | |
e0359f15 | 759 | unsigned long flags; |
28fe5c82 | 760 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 761 | |
2a84cb98 AS |
762 | while (repeat--) { |
763 | unsigned long delay = jiffies + | |
7a18e96d | 764 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 765 | do { |
d8d031a6 LZ |
766 | if (!ec_guard(ec)) |
767 | return 0; | |
e0359f15 | 768 | spin_lock_irqsave(&ec->lock, flags); |
2e84ea5a | 769 | advance_transaction(ec, false); |
e0359f15 | 770 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 771 | } while (time_before(jiffies, delay)); |
16a26e85 | 772 | pr_debug("controller reset, restart transaction\n"); |
e0359f15 | 773 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 774 | start_transaction(ec); |
e0359f15 | 775 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 776 | } |
b77d81b2 | 777 | return -ETIME; |
1da177e4 LT |
778 | } |
779 | ||
8463200a | 780 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 781 | struct transaction *t) |
45bea155 | 782 | { |
e0359f15 | 783 | unsigned long tmp; |
7c6db4e0 | 784 | int ret = 0; |
7a73e60e | 785 | |
7c6db4e0 | 786 | /* start transaction */ |
e0359f15 | 787 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 788 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 789 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
790 | ret = -EINVAL; |
791 | goto unlock; | |
792 | } | |
770970f0 | 793 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 794 | /* following two actions should be kept atomic */ |
8463200a | 795 | ec->curr = t; |
3535a3c1 | 796 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 797 | start_transaction(ec); |
e0359f15 | 798 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 799 | |
df9ff918 | 800 | ret = ec_poll(ec); |
d8d031a6 | 801 | |
e0359f15 | 802 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f | 803 | if (t->irq_count == ec_storm_threshold) |
4446abc9 | 804 | acpi_ec_unmask_events(ec); |
3535a3c1 | 805 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 806 | ec->curr = NULL; |
9887d22a LZ |
807 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
808 | acpi_ec_complete_request(ec); | |
770970f0 | 809 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 810 | unlock: |
e0359f15 | 811 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
812 | return ret; |
813 | } | |
814 | ||
2a84cb98 | 815 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 816 | { |
d7a76e4c | 817 | int status; |
50526df6 | 818 | u32 glk; |
7a73e60e | 819 | |
8463200a | 820 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 821 | return -EINVAL; |
8463200a AS |
822 | if (t->rdata) |
823 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 824 | |
f351d027 | 825 | mutex_lock(&ec->mutex); |
703959d4 | 826 | if (ec->global_lock) { |
1da177e4 | 827 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 828 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
829 | status = -ENODEV; |
830 | goto unlock; | |
c24e912b | 831 | } |
1da177e4 | 832 | } |
a62e8f19 | 833 | |
2a84cb98 | 834 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 835 | |
703959d4 | 836 | if (ec->global_lock) |
1da177e4 | 837 | acpi_release_global_lock(glk); |
7c6db4e0 | 838 | unlock: |
f351d027 | 839 | mutex_unlock(&ec->mutex); |
d550d98d | 840 | return status; |
1da177e4 LT |
841 | } |
842 | ||
8a383ef0 | 843 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
844 | { |
845 | u8 d; | |
8463200a AS |
846 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
847 | .wdata = NULL, .rdata = &d, | |
848 | .wlen = 0, .rlen = 1}; | |
849 | ||
2a84cb98 | 850 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
851 | } |
852 | ||
8a383ef0 | 853 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 854 | { |
8463200a AS |
855 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
856 | .wdata = NULL, .rdata = NULL, | |
857 | .wlen = 0, .rlen = 0}; | |
858 | ||
7c6db4e0 | 859 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 860 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
861 | } |
862 | ||
7a73e60e | 863 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
864 | { |
865 | int result; | |
866 | u8 d; | |
8463200a AS |
867 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
868 | .wdata = &address, .rdata = &d, | |
869 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 870 | |
2a84cb98 | 871 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
872 | *data = d; |
873 | return result; | |
874 | } | |
6ffb221a | 875 | |
3576cf61 DS |
876 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
877 | { | |
6ccedb10 | 878 | u8 wdata[2] = { address, data }; |
8463200a AS |
879 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
880 | .wdata = wdata, .rdata = NULL, | |
881 | .wlen = 2, .rlen = 0}; | |
882 | ||
2a84cb98 | 883 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
884 | } |
885 | ||
b76b51ba | 886 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 887 | { |
1da177e4 | 888 | int err; |
6ffb221a | 889 | u8 temp_data; |
1da177e4 LT |
890 | |
891 | if (!first_ec) | |
892 | return -ENODEV; | |
893 | ||
d033879c | 894 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
895 | |
896 | if (!err) { | |
897 | *val = temp_data; | |
898 | return 0; | |
7a73e60e LZ |
899 | } |
900 | return err; | |
1da177e4 LT |
901 | } |
902 | EXPORT_SYMBOL(ec_read); | |
903 | ||
50526df6 | 904 | int ec_write(u8 addr, u8 val) |
1da177e4 | 905 | { |
1da177e4 LT |
906 | if (!first_ec) |
907 | return -ENODEV; | |
908 | ||
b3c0e38b | 909 | return acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
910 | } |
911 | EXPORT_SYMBOL(ec_write); | |
912 | ||
616362de | 913 | int ec_transaction(u8 command, |
7a73e60e LZ |
914 | const u8 *wdata, unsigned wdata_len, |
915 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 916 | { |
8463200a AS |
917 | struct transaction t = {.command = command, |
918 | .wdata = wdata, .rdata = rdata, | |
919 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 920 | |
d7a76e4c LP |
921 | if (!first_ec) |
922 | return -ENODEV; | |
45bea155 | 923 | |
2a84cb98 | 924 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 925 | } |
ab9e43c6 LP |
926 | EXPORT_SYMBOL(ec_transaction); |
927 | ||
3e2abc5a SF |
928 | /* Get the handle to the EC device */ |
929 | acpi_handle ec_get_handle(void) | |
930 | { | |
931 | if (!first_ec) | |
932 | return NULL; | |
933 | return first_ec->handle; | |
934 | } | |
3e2abc5a SF |
935 | EXPORT_SYMBOL(ec_get_handle); |
936 | ||
ad479e7f LZ |
937 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
938 | { | |
e0359f15 RW |
939 | unsigned long flags; |
940 | ||
941 | spin_lock_irqsave(&ec->lock, flags); | |
ad479e7f | 942 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { |
3535a3c1 | 943 | ec_dbg_drv("Starting EC"); |
9887d22a | 944 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 945 | if (!resuming) { |
9887d22a | 946 | acpi_ec_submit_request(ec); |
770970f0 | 947 | ec_dbg_ref(ec, "Increase driver"); |
c2b46d67 | 948 | } |
3535a3c1 | 949 | ec_log_drv("EC started"); |
ad479e7f | 950 | } |
e0359f15 | 951 | spin_unlock_irqrestore(&ec->lock, flags); |
ad479e7f LZ |
952 | } |
953 | ||
9887d22a LZ |
954 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
955 | { | |
e0359f15 | 956 | unsigned long flags; |
9887d22a LZ |
957 | bool flushed; |
958 | ||
e0359f15 | 959 | spin_lock_irqsave(&ec->lock, flags); |
9887d22a | 960 | flushed = acpi_ec_flushed(ec); |
e0359f15 | 961 | spin_unlock_irqrestore(&ec->lock, flags); |
9887d22a LZ |
962 | return flushed; |
963 | } | |
964 | ||
ad479e7f LZ |
965 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
966 | { | |
e0359f15 RW |
967 | unsigned long flags; |
968 | ||
969 | spin_lock_irqsave(&ec->lock, flags); | |
ad479e7f | 970 | if (acpi_ec_started(ec)) { |
3535a3c1 | 971 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 972 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
e0359f15 | 973 | spin_unlock_irqrestore(&ec->lock, flags); |
9887d22a | 974 | wait_event(ec->wait, acpi_ec_stopped(ec)); |
e0359f15 | 975 | spin_lock_irqsave(&ec->lock, flags); |
9887d22a | 976 | /* Disable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 977 | if (!suspending) { |
9887d22a | 978 | acpi_ec_complete_request(ec); |
770970f0 | 979 | ec_dbg_ref(ec, "Decrease driver"); |
39a2a2aa | 980 | } else if (!ec_freeze_events) |
750f628b | 981 | __acpi_ec_disable_event(ec); |
ad479e7f LZ |
982 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
983 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 984 | ec_log_drv("EC stopped"); |
ad479e7f | 985 | } |
e0359f15 | 986 | spin_unlock_irqrestore(&ec->lock, flags); |
ad479e7f LZ |
987 | } |
988 | ||
c3a696b6 LZ |
989 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) |
990 | { | |
e0359f15 RW |
991 | unsigned long flags; |
992 | ||
993 | spin_lock_irqsave(&ec->lock, flags); | |
c3a696b6 LZ |
994 | ec->busy_polling = true; |
995 | ec->polling_guard = 0; | |
996 | ec_log_drv("interrupt blocked"); | |
e0359f15 | 997 | spin_unlock_irqrestore(&ec->lock, flags); |
c3a696b6 LZ |
998 | } |
999 | ||
1000 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) | |
1001 | { | |
e0359f15 RW |
1002 | unsigned long flags; |
1003 | ||
1004 | spin_lock_irqsave(&ec->lock, flags); | |
c3a696b6 LZ |
1005 | ec->busy_polling = ec_busy_polling; |
1006 | ec->polling_guard = ec_polling_guard; | |
1007 | ec_log_drv("interrupt unblocked"); | |
e0359f15 | 1008 | spin_unlock_irqrestore(&ec->lock, flags); |
c3a696b6 LZ |
1009 | } |
1010 | ||
fe955682 | 1011 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
1012 | { |
1013 | struct acpi_ec *ec = first_ec; | |
1014 | ||
1015 | if (!ec) | |
1016 | return; | |
1017 | ||
f351d027 | 1018 | mutex_lock(&ec->mutex); |
f6bb13aa | 1019 | /* Prevent transactions from being carried out */ |
ad479e7f | 1020 | acpi_ec_stop(ec, true); |
f351d027 | 1021 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
1022 | } |
1023 | ||
fe955682 | 1024 | void acpi_ec_unblock_transactions(void) |
d5a64513 RW |
1025 | { |
1026 | /* | |
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). | |
1029 | */ | |
1030 | if (first_ec) | |
ad479e7f | 1031 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
1032 | } |
1033 | ||
1da177e4 LT |
1034 | /* -------------------------------------------------------------------------- |
1035 | Event Management | |
1036 | -------------------------------------------------------------------------- */ | |
0700c047 LZ |
1037 | static struct acpi_ec_query_handler * |
1038 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) | |
1039 | { | |
1040 | struct acpi_ec_query_handler *handler; | |
0700c047 LZ |
1041 | |
1042 | mutex_lock(&ec->mutex); | |
1043 | list_for_each_entry(handler, &ec->list, node) { | |
1044 | if (value == handler->query_bit) { | |
3df663a1 RW |
1045 | kref_get(&handler->kref); |
1046 | mutex_unlock(&ec->mutex); | |
1047 | return handler; | |
0700c047 LZ |
1048 | } |
1049 | } | |
1050 | mutex_unlock(&ec->mutex); | |
3df663a1 | 1051 | return NULL; |
0700c047 LZ |
1052 | } |
1053 | ||
01305d41 LZ |
1054 | static void acpi_ec_query_handler_release(struct kref *kref) |
1055 | { | |
1056 | struct acpi_ec_query_handler *handler = | |
1057 | container_of(kref, struct acpi_ec_query_handler, kref); | |
1058 | ||
1059 | kfree(handler); | |
1060 | } | |
1061 | ||
1062 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
1063 | { | |
1064 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
1065 | } | |
1066 | ||
837012ed AS |
1067 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
1068 | acpi_handle handle, acpi_ec_query_func func, | |
1069 | void *data) | |
1070 | { | |
28f7b858 AW |
1071 | struct acpi_ec_query_handler *handler; |
1072 | ||
1073 | if (!handle && !func) | |
1074 | return -EINVAL; | |
7a73e60e | 1075 | |
28f7b858 | 1076 | handler = kzalloc(sizeof(*handler), GFP_KERNEL); |
837012ed AS |
1077 | if (!handler) |
1078 | return -ENOMEM; | |
1079 | ||
1080 | handler->query_bit = query_bit; | |
1081 | handler->handle = handle; | |
1082 | handler->func = func; | |
1083 | handler->data = data; | |
f351d027 | 1084 | mutex_lock(&ec->mutex); |
01305d41 | 1085 | kref_init(&handler->kref); |
30c08574 | 1086 | list_add(&handler->node, &ec->list); |
f351d027 | 1087 | mutex_unlock(&ec->mutex); |
28f7b858 | 1088 | |
837012ed AS |
1089 | return 0; |
1090 | } | |
837012ed AS |
1091 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
1092 | ||
0700c047 LZ |
1093 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
1094 | bool remove_all, u8 query_bit) | |
837012ed | 1095 | { |
1544fdbc | 1096 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 1097 | LIST_HEAD(free_list); |
7a73e60e | 1098 | |
f351d027 | 1099 | mutex_lock(&ec->mutex); |
1544fdbc | 1100 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
28f7b858 AW |
1101 | /* |
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 | |
1105 | * EC queries. | |
1106 | */ | |
1107 | if (remove_all || (handler->func && handler->query_bit == query_bit)) { | |
01305d41 LZ |
1108 | list_del_init(&handler->node); |
1109 | list_add(&handler->node, &free_list); | |
28f7b858 | 1110 | |
837012ed AS |
1111 | } |
1112 | } | |
f351d027 | 1113 | mutex_unlock(&ec->mutex); |
6b5eab54 | 1114 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 1115 | acpi_ec_put_query_handler(handler); |
837012ed | 1116 | } |
0700c047 LZ |
1117 | |
1118 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
1119 | { | |
1120 | acpi_ec_remove_query_handlers(ec, false, query_bit); | |
e5b492c6 | 1121 | flush_workqueue(ec_query_wq); |
0700c047 | 1122 | } |
837012ed | 1123 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 1124 | |
02b771b6 LZ |
1125 | static void acpi_ec_event_processor(struct work_struct *work) |
1126 | { | |
1127 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); | |
1128 | struct acpi_ec_query_handler *handler = q->handler; | |
4a9af6ca | 1129 | struct acpi_ec *ec = q->ec; |
7a73e60e | 1130 | |
3535a3c1 | 1131 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
4a9af6ca | 1132 | |
a62e8f19 AS |
1133 | if (handler->func) |
1134 | handler->func(handler->data); | |
1135 | else if (handler->handle) | |
1136 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
4a9af6ca | 1137 | |
3535a3c1 | 1138 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
4a9af6ca | 1139 | |
e0359f15 | 1140 | spin_lock_irq(&ec->lock); |
4a9af6ca | 1141 | ec->queries_in_progress--; |
e0359f15 | 1142 | spin_unlock_irq(&ec->lock); |
4a9af6ca | 1143 | |
befd9b5b RW |
1144 | acpi_ec_put_query_handler(handler); |
1145 | kfree(q); | |
1146 | } | |
1147 | ||
1148 | static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval) | |
1149 | { | |
1150 | struct acpi_ec_query *q; | |
1151 | struct transaction *t; | |
1152 | ||
1153 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); | |
1154 | if (!q) | |
1155 | return NULL; | |
1156 | ||
1157 | INIT_WORK(&q->work, acpi_ec_event_processor); | |
1158 | t = &q->transaction; | |
1159 | t->command = ACPI_EC_COMMAND_QUERY; | |
1160 | t->rdata = pval; | |
1161 | t->rlen = 1; | |
1162 | q->ec = ec; | |
1163 | return q; | |
a62e8f19 AS |
1164 | } |
1165 | ||
eafe7509 | 1166 | static int acpi_ec_submit_query(struct acpi_ec *ec) |
a62e8f19 | 1167 | { |
1f235044 | 1168 | struct acpi_ec_query *q; |
a62e8f19 | 1169 | u8 value = 0; |
c2cf5769 | 1170 | int result; |
02b771b6 | 1171 | |
4a9af6ca | 1172 | q = acpi_ec_create_query(ec, &value); |
02b771b6 LZ |
1173 | if (!q) |
1174 | return -ENOMEM; | |
3eba563e | 1175 | |
550b3aac LZ |
1176 | /* |
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). | |
1180 | */ | |
02b771b6 | 1181 | result = acpi_ec_transaction(ec, &q->transaction); |
02b771b6 LZ |
1182 | if (result) |
1183 | goto err_exit; | |
3eba563e | 1184 | |
1f235044 RW |
1185 | if (!value) { |
1186 | result = -ENODATA; | |
1187 | goto err_exit; | |
1188 | } | |
1189 | ||
0700c047 LZ |
1190 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
1191 | if (!q->handler) { | |
1192 | result = -ENODATA; | |
1193 | goto err_exit; | |
1194 | } | |
1195 | ||
1196 | /* | |
4a9af6ca | 1197 | * It is reported that _Qxx are evaluated in a parallel way on Windows: |
0700c047 LZ |
1198 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 |
1199 | * | |
4a9af6ca RW |
1200 | * Put this log entry before queue_work() to make it appear in the log |
1201 | * before any other messages emitted during workqueue handling. | |
0700c047 LZ |
1202 | */ |
1203 | ec_dbg_evt("Query(0x%02x) scheduled", value); | |
4a9af6ca | 1204 | |
e0359f15 | 1205 | spin_lock_irq(&ec->lock); |
4a9af6ca RW |
1206 | |
1207 | ec->queries_in_progress++; | |
1208 | queue_work(ec_query_wq, &q->work); | |
1209 | ||
e0359f15 | 1210 | spin_unlock_irq(&ec->lock); |
02b771b6 | 1211 | |
befd9b5b RW |
1212 | return 0; |
1213 | ||
02b771b6 | 1214 | err_exit: |
befd9b5b | 1215 | kfree(q); |
1f235044 | 1216 | |
c2cf5769 | 1217 | return result; |
a62e8f19 AS |
1218 | } |
1219 | ||
9d8993be | 1220 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 1221 | { |
74443bbe | 1222 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 1223 | |
9d8993be LZ |
1224 | ec_dbg_evt("Event started"); |
1225 | ||
e0359f15 | 1226 | spin_lock_irq(&ec->lock); |
a105acd7 | 1227 | |
c793570d | 1228 | while (ec->events_to_process) { |
e0359f15 | 1229 | spin_unlock_irq(&ec->lock); |
1f235044 | 1230 | |
eafe7509 | 1231 | acpi_ec_submit_query(ec); |
1f235044 | 1232 | |
e0359f15 | 1233 | spin_lock_irq(&ec->lock); |
13a62d0e | 1234 | |
c793570d | 1235 | ec->events_to_process--; |
9d8993be | 1236 | } |
388fb77d RW |
1237 | |
1238 | /* | |
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. | |
1242 | */ | |
13a62d0e RW |
1243 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { |
1244 | bool guard_timeout; | |
1245 | ||
c33676aa | 1246 | acpi_ec_complete_event(ec); |
388fb77d | 1247 | |
13a62d0e | 1248 | ec_dbg_evt("Event stopped"); |
9d8993be | 1249 | |
e0359f15 | 1250 | spin_unlock_irq(&ec->lock); |
13a62d0e RW |
1251 | |
1252 | guard_timeout = !!ec_guard(ec); | |
1d68d261 | 1253 | |
e0359f15 | 1254 | spin_lock_irq(&ec->lock); |
98d36450 RW |
1255 | |
1256 | /* Take care of SCI_EVT unless someone else is doing that. */ | |
13a62d0e | 1257 | if (guard_timeout && !ec->curr) |
98d36450 | 1258 | advance_transaction(ec, false); |
13a62d0e RW |
1259 | } else { |
1260 | acpi_ec_close_event(ec); | |
98d36450 | 1261 | |
13a62d0e | 1262 | ec_dbg_evt("Event stopped"); |
98d36450 | 1263 | } |
4a9af6ca | 1264 | |
4a9af6ca | 1265 | ec->events_in_progress--; |
13a62d0e | 1266 | |
e0359f15 | 1267 | spin_unlock_irq(&ec->lock); |
45bea155 | 1268 | } |
1da177e4 | 1269 | |
b5539eb5 | 1270 | static void clear_gpe_and_advance_transaction(struct acpi_ec *ec, bool interrupt) |
1da177e4 | 1271 | { |
896e97bf CJ |
1272 | /* |
1273 | * Clear GPE_STS upfront to allow subsequent hardware GPE_STS 0->1 | |
1274 | * changes to always trigger a GPE interrupt. | |
1275 | * | |
1276 | * GPE STS is a W1C register, which means: | |
1277 | * | |
1278 | * 1. Software can clear it without worrying about clearing the other | |
1279 | * GPEs' STS bits when the hardware sets them in parallel. | |
1280 | * | |
1281 | * 2. As long as software can ensure only clearing it when it is set, | |
1282 | * hardware won't set it in parallel. | |
1283 | */ | |
1284 | if (ec->gpe >= 0 && acpi_ec_gpe_status_set(ec)) | |
1285 | acpi_clear_gpe(NULL, ec->gpe); | |
1286 | ||
2e84ea5a | 1287 | advance_transaction(ec, true); |
b5539eb5 RW |
1288 | } |
1289 | ||
1290 | static void acpi_ec_handle_interrupt(struct acpi_ec *ec) | |
1291 | { | |
e0359f15 RW |
1292 | unsigned long flags; |
1293 | ||
1294 | spin_lock_irqsave(&ec->lock, flags); | |
b5539eb5 RW |
1295 | |
1296 | clear_gpe_and_advance_transaction(ec, true); | |
1297 | ||
e0359f15 | 1298 | spin_unlock_irqrestore(&ec->lock, flags); |
406857f7 DD |
1299 | } |
1300 | ||
1301 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, | |
1302 | u32 gpe_number, void *data) | |
1303 | { | |
1304 | acpi_ec_handle_interrupt(data); | |
ca37bfdf | 1305 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
1306 | } |
1307 | ||
406857f7 DD |
1308 | static irqreturn_t acpi_ec_irq_handler(int irq, void *data) |
1309 | { | |
1310 | acpi_ec_handle_interrupt(data); | |
1311 | return IRQ_HANDLED; | |
1312 | } | |
1313 | ||
1da177e4 | 1314 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1315 | * Address Space Management |
1316 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1317 | |
1da177e4 | 1318 | static acpi_status |
5b7734b4 | 1319 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1320 | u32 bits, u64 *value64, |
50526df6 | 1321 | void *handler_context, void *region_context) |
1da177e4 | 1322 | { |
3d02b90b | 1323 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1324 | int result = 0, i, bytes = bits / 8; |
1325 | u8 *value = (u8 *)value64; | |
1da177e4 | 1326 | |
1da177e4 | 1327 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1328 | return AE_BAD_PARAMETER; |
1da177e4 | 1329 | |
5b7734b4 | 1330 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1331 | return AE_BAD_PARAMETER; |
1da177e4 | 1332 | |
c3a696b6 | 1333 | if (ec->busy_polling || bits > 8) |
6a63b06f | 1334 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1335 | |
dadf28a1 AS |
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); | |
1da177e4 | 1340 | |
c3a696b6 | 1341 | if (ec->busy_polling || bits > 8) |
6a63b06f | 1342 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1343 | |
1da177e4 LT |
1344 | switch (result) { |
1345 | case -EINVAL: | |
d550d98d | 1346 | return AE_BAD_PARAMETER; |
1da177e4 | 1347 | case -ENODEV: |
d550d98d | 1348 | return AE_NOT_FOUND; |
1da177e4 | 1349 | case -ETIME: |
d550d98d | 1350 | return AE_TIME; |
1da177e4 | 1351 | default: |
d550d98d | 1352 | return AE_OK; |
1da177e4 | 1353 | } |
1da177e4 LT |
1354 | } |
1355 | ||
1da177e4 | 1356 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1357 | * Driver Interface |
1358 | * -------------------------------------------------------------------------- */ | |
1359 | ||
c0900c35 AS |
1360 | static acpi_status |
1361 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1362 | ||
72c77b7e LZ |
1363 | static void acpi_ec_free(struct acpi_ec *ec) |
1364 | { | |
1365 | if (first_ec == ec) | |
1366 | first_ec = NULL; | |
1367 | if (boot_ec == ec) | |
1368 | boot_ec = NULL; | |
1369 | kfree(ec); | |
1370 | } | |
1371 | ||
1372 | static struct acpi_ec *acpi_ec_alloc(void) | |
c0900c35 AS |
1373 | { |
1374 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1375 | |
c0900c35 AS |
1376 | if (!ec) |
1377 | return NULL; | |
f351d027 | 1378 | mutex_init(&ec->mutex); |
c0900c35 | 1379 | init_waitqueue_head(&ec->wait); |
837012ed | 1380 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1381 | spin_lock_init(&ec->lock); |
9d8993be | 1382 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1383 | ec->timestamp = jiffies; |
c3a696b6 LZ |
1384 | ec->busy_polling = true; |
1385 | ec->polling_guard = 0; | |
406857f7 DD |
1386 | ec->gpe = -1; |
1387 | ec->irq = -1; | |
c0900c35 AS |
1388 | return ec; |
1389 | } | |
837012ed | 1390 | |
c019b193 AS |
1391 | static acpi_status |
1392 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1393 | void *context, void **return_value) | |
1394 | { | |
0175d562 LM |
1395 | char node_name[5]; |
1396 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1397 | struct acpi_ec *ec = context; |
1398 | int value = 0; | |
0175d562 LM |
1399 | acpi_status status; |
1400 | ||
1401 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1402 | ||
7a73e60e | 1403 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1404 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1405 | return AE_OK; |
1406 | } | |
1407 | ||
cd8c93a4 AS |
1408 | static acpi_status |
1409 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1410 | { |
cd8c93a4 | 1411 | acpi_status status; |
d21cf3c1 | 1412 | unsigned long long tmp = 0; |
cd8c93a4 | 1413 | struct acpi_ec *ec = context; |
a5032bfd AS |
1414 | |
1415 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1416 | ec->command_addr = ec->data_addr = 0; | |
1417 | ||
cd8c93a4 AS |
1418 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1419 | ec_parse_io_ports, ec); | |
1420 | if (ACPI_FAILURE(status)) | |
1421 | return status; | |
ae56c9fd LZ |
1422 | if (ec->data_addr == 0 || ec->command_addr == 0) |
1423 | return AE_OK; | |
837012ed | 1424 | |
f7090e0e HG |
1425 | /* Get GPE bit assignment (EC events). */ |
1426 | /* TODO: Add support for _GPE returning a package */ | |
1427 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); | |
1428 | if (ACPI_SUCCESS(status)) | |
1429 | ec->gpe = tmp; | |
1430 | /* | |
1431 | * Errors are non-fatal, allowing for ACPI Reduced Hardware | |
1432 | * platforms which use GpioInt instead of GPE. | |
1433 | */ | |
406857f7 | 1434 | |
837012ed | 1435 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1436 | tmp = 0; |
27663c58 MW |
1437 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1438 | ec->global_lock = tmp; | |
837012ed | 1439 | ec->handle = handle; |
cd8c93a4 | 1440 | return AE_CTRL_TERMINATE; |
837012ed AS |
1441 | } |
1442 | ||
03e9a0e0 | 1443 | static bool install_gpe_event_handler(struct acpi_ec *ec) |
406857f7 | 1444 | { |
03e9a0e0 | 1445 | acpi_status status; |
406857f7 | 1446 | |
03e9a0e0 RW |
1447 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
1448 | ACPI_GPE_EDGE_TRIGGERED, | |
1449 | &acpi_ec_gpe_handler, ec); | |
1450 | if (ACPI_FAILURE(status)) | |
1451 | return false; | |
406857f7 | 1452 | |
03e9a0e0 RW |
1453 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && ec->reference_count >= 1) |
1454 | acpi_ec_enable_gpe(ec, true); | |
406857f7 | 1455 | |
03e9a0e0 RW |
1456 | return true; |
1457 | } | |
406857f7 | 1458 | |
03e9a0e0 RW |
1459 | static bool install_gpio_irq_event_handler(struct acpi_ec *ec) |
1460 | { | |
655a6e7c RW |
1461 | return request_threaded_irq(ec->irq, NULL, acpi_ec_irq_handler, |
1462 | IRQF_SHARED | IRQF_ONESHOT, "ACPI EC", ec) >= 0; | |
406857f7 DD |
1463 | } |
1464 | ||
03e9a0e0 RW |
1465 | /** |
1466 | * ec_install_handlers - Install service callbacks and register query methods. | |
1467 | * @ec: Target EC. | |
1468 | * @device: ACPI device object corresponding to @ec. | |
ab4620f5 | 1469 | * @call_reg: If _REG should be called to notify OpRegion availability |
03e9a0e0 RW |
1470 | * |
1471 | * Install a handler for the EC address space type unless it has been installed | |
1472 | * already. If @device is not NULL, also look for EC query methods in the | |
1473 | * namespace and register them, and install an event (either GPE or GPIO IRQ) | |
1474 | * handler for the EC, if possible. | |
1475 | * | |
1476 | * Return: | |
1477 | * -ENODEV if the address space handler cannot be installed, which means | |
1478 | * "unable to handle transactions", | |
1479 | * -EPROBE_DEFER if GPIO IRQ acquisition needs to be deferred, | |
1480 | * or 0 (success) otherwise. | |
72c77b7e | 1481 | */ |
ab4620f5 HG |
1482 | static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device, |
1483 | bool call_reg) | |
5efc5476 BH |
1484 | { |
1485 | acpi_status status; | |
7a73e60e | 1486 | |
ad479e7f | 1487 | acpi_ec_start(ec, false); |
0e1affe4 LZ |
1488 | |
1489 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { | |
c3a696b6 | 1490 | acpi_ec_enter_noirq(ec); |
ab4620f5 HG |
1491 | status = acpi_install_address_space_handler_no_reg(ec->handle, |
1492 | ACPI_ADR_SPACE_EC, | |
1493 | &acpi_ec_space_handler, | |
1494 | NULL, ec); | |
0e1affe4 | 1495 | if (ACPI_FAILURE(status)) { |
7247f0c2 RW |
1496 | acpi_ec_stop(ec, false); |
1497 | return -ENODEV; | |
0e1affe4 LZ |
1498 | } |
1499 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
a5072078 | 1500 | ec->address_space_handler_holder = ec->handle; |
0e1affe4 LZ |
1501 | } |
1502 | ||
ab4620f5 HG |
1503 | if (call_reg && !test_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags)) { |
1504 | acpi_execute_reg_methods(ec->handle, ACPI_ADR_SPACE_EC); | |
1505 | set_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags); | |
0e1affe4 LZ |
1506 | } |
1507 | ||
a2b69177 | 1508 | if (!device) |
2a570840 LZ |
1509 | return 0; |
1510 | ||
03e9a0e0 RW |
1511 | if (ec->gpe < 0) { |
1512 | /* ACPI reduced hardware platforms use a GpioInt from _CRS. */ | |
1513 | int irq = acpi_dev_gpio_irq_get(device, 0); | |
1514 | /* | |
1515 | * Bail out right away for deferred probing or complete the | |
1516 | * initialization regardless of any other errors. | |
1517 | */ | |
1518 | if (irq == -EPROBE_DEFER) | |
1519 | return -EPROBE_DEFER; | |
1520 | else if (irq >= 0) | |
1521 | ec->irq = irq; | |
1522 | } | |
1523 | ||
4446abc9 | 1524 | if (!test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) { |
2a570840 LZ |
1525 | /* Find and register all query methods */ |
1526 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
1527 | acpi_ec_register_query_methods, | |
1528 | NULL, ec, NULL); | |
4446abc9 | 1529 | set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags); |
2a570840 | 1530 | } |
4446abc9 | 1531 | if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { |
03e9a0e0 RW |
1532 | bool ready = false; |
1533 | ||
1534 | if (ec->gpe >= 0) | |
1535 | ready = install_gpe_event_handler(ec); | |
1536 | else if (ec->irq >= 0) | |
1537 | ready = install_gpio_irq_event_handler(ec); | |
1538 | ||
1539 | if (ready) { | |
1540 | set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags); | |
1541 | acpi_ec_leave_noirq(ec); | |
5efc5476 | 1542 | } |
03e9a0e0 RW |
1543 | /* |
1544 | * Failures to install an event handler are not fatal, because | |
1545 | * the EC can be polled for events. | |
1546 | */ | |
5efc5476 | 1547 | } |
53c5eaab LZ |
1548 | /* EC is fully operational, allow queries */ |
1549 | acpi_ec_enable_event(ec); | |
5efc5476 | 1550 | |
5efc5476 BH |
1551 | return 0; |
1552 | } | |
1553 | ||
4c611060 AS |
1554 | static void ec_remove_handlers(struct acpi_ec *ec) |
1555 | { | |
0e1affe4 | 1556 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
a5072078 HG |
1557 | if (ACPI_FAILURE(acpi_remove_address_space_handler( |
1558 | ec->address_space_handler_holder, | |
0e1affe4 LZ |
1559 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
1560 | pr_err("failed to remove space handler\n"); | |
1561 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1562 | } | |
1563 | ||
fa5b4a50 LZ |
1564 | /* |
1565 | * Stops handling the EC transactions after removing the operation | |
1566 | * region handler. This is required because _REG(DISCONNECT) | |
1567 | * invoked during the removal can result in new EC transactions. | |
1568 | * | |
1569 | * Flushes the EC requests and thus disables the GPE before | |
1570 | * removing the GPE handler. This is required by the current ACPICA | |
1571 | * GPE core. ACPICA GPE core will automatically disable a GPE when | |
1572 | * it is indicated but there is no way to handle it. So the drivers | |
1573 | * must disable the GPEs prior to removing the GPE handlers. | |
1574 | */ | |
1575 | acpi_ec_stop(ec, false); | |
1576 | ||
4446abc9 | 1577 | if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { |
406857f7 DD |
1578 | if (ec->gpe >= 0 && |
1579 | ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
1580 | &acpi_ec_gpe_handler))) | |
0e1affe4 | 1581 | pr_err("failed to remove gpe handler\n"); |
406857f7 DD |
1582 | |
1583 | if (ec->irq >= 0) | |
1584 | free_irq(ec->irq, ec); | |
1585 | ||
4446abc9 | 1586 | clear_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags); |
0e1affe4 | 1587 | } |
4446abc9 | 1588 | if (test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) { |
2a570840 | 1589 | acpi_ec_remove_query_handlers(ec, true, 0); |
4446abc9 | 1590 | clear_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags); |
2a570840 | 1591 | } |
4c611060 AS |
1592 | } |
1593 | ||
ab4620f5 | 1594 | static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device, bool call_reg) |
1da177e4 | 1595 | { |
72c77b7e | 1596 | int ret; |
c0900c35 | 1597 | |
ab4620f5 | 1598 | ret = ec_install_handlers(ec, device, call_reg); |
72c77b7e LZ |
1599 | if (ret) |
1600 | return ret; | |
1601 | ||
1602 | /* First EC capable of handling transactions */ | |
c823c17a | 1603 | if (!first_ec) |
72c77b7e | 1604 | first_ec = ec; |
72c77b7e | 1605 | |
c823c17a RW |
1606 | pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec->command_addr, |
1607 | ec->data_addr); | |
97cb159f | 1608 | |
c823c17a RW |
1609 | if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { |
1610 | if (ec->gpe >= 0) | |
1611 | pr_info("GPE=0x%x\n", ec->gpe); | |
1612 | else | |
1613 | pr_info("IRQ=%d\n", ec->irq); | |
a5032bfd | 1614 | } |
97cb159f | 1615 | |
72c77b7e | 1616 | return ret; |
97cb159f LZ |
1617 | } |
1618 | ||
fd6231e7 LZ |
1619 | static int acpi_ec_add(struct acpi_device *device) |
1620 | { | |
e3cfabcd | 1621 | struct acpi_ec *ec; |
116f2b34 | 1622 | int ret; |
fd6231e7 LZ |
1623 | |
1624 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1625 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1626 | ||
d7e0481c RW |
1627 | if (boot_ec && (boot_ec->handle == device->handle || |
1628 | !strcmp(acpi_device_hid(device), ACPI_ECDT_HID))) { | |
e3cfabcd | 1629 | /* Fast path: this device corresponds to the boot EC. */ |
a64a62ce LZ |
1630 | ec = boot_ec; |
1631 | } else { | |
e3cfabcd RW |
1632 | acpi_status status; |
1633 | ||
a64a62ce LZ |
1634 | ec = acpi_ec_alloc(); |
1635 | if (!ec) | |
1636 | return -ENOMEM; | |
116f2b34 | 1637 | |
a64a62ce LZ |
1638 | status = ec_parse_device(device->handle, 0, ec, NULL); |
1639 | if (status != AE_CTRL_TERMINATE) { | |
46922d2a | 1640 | ret = -EINVAL; |
03e9a0e0 | 1641 | goto err; |
a64a62ce | 1642 | } |
4c611060 | 1643 | |
116f2b34 | 1644 | if (boot_ec && ec->command_addr == boot_ec->command_addr && |
81df5f91 | 1645 | ec->data_addr == boot_ec->data_addr) { |
a64a62ce | 1646 | /* |
81df5f91 HG |
1647 | * Trust PNP0C09 namespace location rather than ECDT ID. |
1648 | * But trust ECDT GPE rather than _GPE because of ASUS | |
1649 | * quirks. So do not change boot_ec->gpe to ec->gpe, | |
1650 | * except when the TRUST_DSDT_GPE quirk is set. | |
a64a62ce LZ |
1651 | */ |
1652 | boot_ec->handle = ec->handle; | |
81df5f91 HG |
1653 | |
1654 | if (EC_FLAGS_TRUST_DSDT_GPE) | |
1655 | boot_ec->gpe = ec->gpe; | |
1656 | ||
a64a62ce LZ |
1657 | acpi_handle_debug(ec->handle, "duplicated.\n"); |
1658 | acpi_ec_free(ec); | |
1659 | ec = boot_ec; | |
1660 | } | |
d2c62aef RW |
1661 | } |
1662 | ||
ab4620f5 | 1663 | ret = acpi_ec_setup(ec, device, true); |
46922d2a | 1664 | if (ret) |
03e9a0e0 | 1665 | goto err; |
46922d2a | 1666 | |
d2c62aef RW |
1667 | if (ec == boot_ec) |
1668 | acpi_handle_info(boot_ec->handle, | |
65a691f5 | 1669 | "Boot %s EC initialization complete\n", |
116f2b34 | 1670 | boot_ec_is_ecdt ? "ECDT" : "DSDT"); |
d2c62aef | 1671 | |
65a691f5 RW |
1672 | acpi_handle_info(ec->handle, |
1673 | "EC: Used to handle transactions and events\n"); | |
1674 | ||
db89b4f0 | 1675 | device->driver_data = ec; |
de4f1046 | 1676 | |
d6795fe3 AK |
1677 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1678 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1679 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1680 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1681 | |
e3cfabcd | 1682 | /* Reprobe devices depending on the EC */ |
a9e10e58 | 1683 | acpi_dev_clear_dependencies(device); |
e3cfabcd | 1684 | |
97cb159f | 1685 | acpi_handle_debug(ec->handle, "enumerated.\n"); |
46922d2a LZ |
1686 | return 0; |
1687 | ||
03e9a0e0 | 1688 | err: |
97cb159f LZ |
1689 | if (ec != boot_ec) |
1690 | acpi_ec_free(ec); | |
03e9a0e0 | 1691 | |
5efc5476 | 1692 | return ret; |
1da177e4 LT |
1693 | } |
1694 | ||
6c0eb5ba | 1695 | static void acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1696 | { |
01f22462 | 1697 | struct acpi_ec *ec; |
1da177e4 | 1698 | |
1da177e4 | 1699 | if (!device) |
6c0eb5ba | 1700 | return; |
1da177e4 LT |
1701 | |
1702 | ec = acpi_driver_data(device); | |
de4f1046 TR |
1703 | release_region(ec->data_addr, 1); |
1704 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1705 | device->driver_data = NULL; |
97cb159f LZ |
1706 | if (ec != boot_ec) { |
1707 | ec_remove_handlers(ec); | |
1708 | acpi_ec_free(ec); | |
1709 | } | |
1da177e4 LT |
1710 | } |
1711 | ||
1da177e4 | 1712 | static acpi_status |
c0900c35 | 1713 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1714 | { |
3d02b90b | 1715 | struct acpi_ec *ec = context; |
1da177e4 | 1716 | |
01f22462 | 1717 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1718 | return AE_OK; |
1da177e4 LT |
1719 | |
1720 | /* | |
1721 | * The first address region returned is the data port, and | |
1722 | * the second address region returned is the status/command | |
1723 | * port. | |
1724 | */ | |
de4f1046 | 1725 | if (ec->data_addr == 0) |
6ffb221a | 1726 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1727 | else if (ec->command_addr == 0) |
6ffb221a | 1728 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1729 | else |
1da177e4 | 1730 | return AE_CTRL_TERMINATE; |
1da177e4 | 1731 | |
1da177e4 LT |
1732 | return AE_OK; |
1733 | } | |
1734 | ||
dcf15cbd LZ |
1735 | static const struct acpi_device_id ec_device_ids[] = { |
1736 | {"PNP0C09", 0}, | |
a64a62ce | 1737 | {ACPI_ECDT_HID, 0}, |
dcf15cbd LZ |
1738 | {"", 0}, |
1739 | }; | |
1740 | ||
c712bb58 LZ |
1741 | /* |
1742 | * This function is not Windows-compatible as Windows never enumerates the | |
1743 | * namespace EC before the main ACPI device enumeration process. It is | |
1744 | * retained for historical reason and will be deprecated in the future. | |
1745 | */ | |
fdb3c177 | 1746 | void __init acpi_ec_dsdt_probe(void) |
c04209a7 | 1747 | { |
fd6231e7 | 1748 | struct acpi_ec *ec; |
fdb3c177 | 1749 | acpi_status status; |
fd6231e7 | 1750 | int ret; |
dcf15cbd | 1751 | |
c712bb58 LZ |
1752 | /* |
1753 | * If a platform has ECDT, there is no need to proceed as the | |
1754 | * following probe is not a part of the ACPI device enumeration, | |
1755 | * executing _STA is not safe, and thus this probe may risk of | |
1756 | * picking up an invalid EC device. | |
1757 | */ | |
1758 | if (boot_ec) | |
fdb3c177 | 1759 | return; |
c712bb58 | 1760 | |
fd6231e7 LZ |
1761 | ec = acpi_ec_alloc(); |
1762 | if (!ec) | |
fdb3c177 RW |
1763 | return; |
1764 | ||
dcf15cbd | 1765 | /* |
2a570840 LZ |
1766 | * At this point, the namespace is initialized, so start to find |
1767 | * the namespace objects. | |
dcf15cbd | 1768 | */ |
fdb3c177 | 1769 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, ec, NULL); |
fd6231e7 | 1770 | if (ACPI_FAILURE(status) || !ec->handle) { |
fdb3c177 RW |
1771 | acpi_ec_free(ec); |
1772 | return; | |
c04209a7 | 1773 | } |
fdb3c177 | 1774 | |
2a570840 LZ |
1775 | /* |
1776 | * When the DSDT EC is available, always re-configure boot EC to | |
1777 | * have _REG evaluated. _REG can only be evaluated after the | |
1778 | * namespace initialization. | |
1779 | * At this point, the GPE is not fully initialized, so do not to | |
1780 | * handle the events. | |
1781 | */ | |
ab4620f5 | 1782 | ret = acpi_ec_setup(ec, NULL, true); |
c746b6b6 | 1783 | if (ret) { |
72c77b7e | 1784 | acpi_ec_free(ec); |
c746b6b6 RW |
1785 | return; |
1786 | } | |
1787 | ||
1788 | boot_ec = ec; | |
1789 | ||
1790 | acpi_handle_info(ec->handle, | |
1791 | "Boot DSDT EC used to handle transactions\n"); | |
c04209a7 AS |
1792 | } |
1793 | ||
2a570840 | 1794 | /* |
98ada3c5 RW |
1795 | * acpi_ec_ecdt_start - Finalize the boot ECDT EC initialization. |
1796 | * | |
1797 | * First, look for an ACPI handle for the boot ECDT EC if acpi_ec_add() has not | |
1798 | * found a matching object in the namespace. | |
1799 | * | |
1800 | * Next, in case the DSDT EC is not functioning, it is still necessary to | |
1801 | * provide a functional ECDT EC to handle events, so add an extra device object | |
1802 | * to represent it (see https://bugzilla.kernel.org/show_bug.cgi?id=115021). | |
1803 | * | |
1804 | * This is useful on platforms with valid ECDT and invalid DSDT EC settings, | |
1805 | * like ASUS X550ZE (see https://bugzilla.kernel.org/show_bug.cgi?id=196847). | |
2a570840 | 1806 | */ |
98ada3c5 | 1807 | static void __init acpi_ec_ecdt_start(void) |
2a570840 | 1808 | { |
98ada3c5 | 1809 | struct acpi_table_ecdt *ecdt_ptr; |
2a570840 | 1810 | acpi_handle handle; |
98ada3c5 | 1811 | acpi_status status; |
2a570840 | 1812 | |
98ada3c5 RW |
1813 | /* Bail out if a matching EC has been found in the namespace. */ |
1814 | if (!boot_ec || boot_ec->handle != ACPI_ROOT_OBJECT) | |
1815 | return; | |
2a570840 | 1816 | |
98ada3c5 RW |
1817 | /* Look up the object pointed to from the ECDT in the namespace. */ |
1818 | status = acpi_get_table(ACPI_SIG_ECDT, 1, | |
1819 | (struct acpi_table_header **)&ecdt_ptr); | |
1820 | if (ACPI_FAILURE(status)) | |
1821 | return; | |
a64a62ce | 1822 | |
98ada3c5 | 1823 | status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); |
f900bf49 HG |
1824 | if (ACPI_SUCCESS(status)) { |
1825 | boot_ec->handle = handle; | |
2a570840 | 1826 | |
f900bf49 HG |
1827 | /* Add a special ACPI device object to represent the boot EC. */ |
1828 | acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC); | |
1829 | } | |
98ada3c5 | 1830 | |
f900bf49 | 1831 | acpi_put_table((struct acpi_table_header *)ecdt_ptr); |
79149001 LZ |
1832 | } |
1833 | ||
b6a3e147 ZR |
1834 | /* |
1835 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1836 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1837 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1838 | * | |
1839 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1840 | * | |
1841 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1842 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1843 | * behaviour is not known at this time. | |
1844 | * | |
1845 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1846 | * however it is very likely that other Samsung models are affected. | |
1847 | * | |
1848 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1849 | * should be harmless. | |
1850 | */ | |
1851 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1852 | { | |
1853 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1854 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1855 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
1856 | return 0; | |
1857 | } | |
1858 | ||
bc539567 LZ |
1859 | /* |
1860 | * Some ECDTs contain wrong register addresses. | |
1861 | * MSI MS-171F | |
1862 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1863 | */ | |
59f0aa94 LZ |
1864 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
1865 | { | |
1866 | pr_debug("Detected system needing ECDT address correction.\n"); | |
1867 | EC_FLAGS_CORRECT_ECDT = 1; | |
1868 | return 0; | |
1869 | } | |
1870 | ||
4370cbf3 ZR |
1871 | /* |
1872 | * Some ECDTs contain wrong GPE setting, but they share the same port addresses | |
1873 | * with DSDT EC, don't duplicate the DSDT EC with ECDT EC in this case. | |
1874 | * https://bugzilla.kernel.org/show_bug.cgi?id=209989 | |
1875 | */ | |
1876 | static int ec_honor_dsdt_gpe(const struct dmi_system_id *id) | |
1877 | { | |
1878 | pr_debug("Detected system needing DSDT GPE setting.\n"); | |
1879 | EC_FLAGS_TRUST_DSDT_GPE = 1; | |
1880 | return 0; | |
1881 | } | |
1882 | ||
6faadbbb | 1883 | static const struct dmi_system_id ec_dmi_table[] __initconst = { |
0adf3c74 | 1884 | { |
3e6573c5 HG |
1885 | /* |
1886 | * MSI MS-171F | |
1887 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1888 | */ | |
1889 | .callback = ec_correct_ecdt, | |
1890 | .matches = { | |
1891 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), | |
1892 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"), | |
1893 | }, | |
1894 | }, | |
440f53da | 1895 | { |
3e6573c5 HG |
1896 | /* |
1897 | * HP Pavilion Gaming Laptop 15-cx0xxx | |
1898 | * https://bugzilla.kernel.org/show_bug.cgi?id=209989 | |
1899 | */ | |
1900 | .callback = ec_honor_dsdt_gpe, | |
1901 | .matches = { | |
1902 | DMI_MATCH(DMI_SYS_VENDOR, "HP"), | |
1903 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-cx0xxx"), | |
1904 | }, | |
1905 | }, | |
b423f240 MK |
1906 | { |
1907 | /* | |
1908 | * HP Pavilion Gaming Laptop 15-cx0041ur | |
1909 | */ | |
1910 | .callback = ec_honor_dsdt_gpe, | |
1911 | .matches = { | |
1912 | DMI_MATCH(DMI_SYS_VENDOR, "HP"), | |
1913 | DMI_MATCH(DMI_PRODUCT_NAME, "HP 15-cx0041ur"), | |
1914 | }, | |
1915 | }, | |
cd4aece4 HG |
1916 | { |
1917 | /* | |
1918 | * HP Pavilion Gaming Laptop 15-dk1xxx | |
1919 | * https://github.com/systemd/systemd/issues/28942 | |
1920 | */ | |
1921 | .callback = ec_honor_dsdt_gpe, | |
1922 | .matches = { | |
1923 | DMI_MATCH(DMI_SYS_VENDOR, "HP"), | |
1924 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-dk1xxx"), | |
1925 | }, | |
1926 | }, | |
891ddc03 JD |
1927 | { |
1928 | /* | |
1929 | * HP 250 G7 Notebook PC | |
1930 | */ | |
1931 | .callback = ec_honor_dsdt_gpe, | |
1932 | .matches = { | |
1933 | DMI_MATCH(DMI_SYS_VENDOR, "HP"), | |
1934 | DMI_MATCH(DMI_PRODUCT_NAME, "HP 250 G7 Notebook PC"), | |
1935 | }, | |
1936 | }, | |
4370cbf3 | 1937 | { |
3e6573c5 HG |
1938 | /* |
1939 | * Samsung hardware | |
1940 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1941 | */ | |
1942 | .callback = ec_clear_on_resume, | |
1943 | .matches = { | |
1944 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
1945 | }, | |
1946 | }, | |
1947 | {} | |
0adf3c74 AS |
1948 | }; |
1949 | ||
fdb3c177 | 1950 | void __init acpi_ec_ecdt_probe(void) |
c0900c35 | 1951 | { |
50526df6 | 1952 | struct acpi_table_ecdt *ecdt_ptr; |
fd6231e7 | 1953 | struct acpi_ec *ec; |
fdb3c177 RW |
1954 | acpi_status status; |
1955 | int ret; | |
45bea155 | 1956 | |
fdb3c177 | 1957 | /* Generate a boot ec context. */ |
0adf3c74 | 1958 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1959 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1960 | (struct acpi_table_header **)&ecdt_ptr); | |
fdb3c177 RW |
1961 | if (ACPI_FAILURE(status)) |
1962 | return; | |
0adf3c74 | 1963 | |
59f0aa94 LZ |
1964 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
1965 | /* | |
1966 | * Asus X50GL: | |
1967 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 | |
1968 | */ | |
f900bf49 | 1969 | goto out; |
ed4b197d | 1970 | } |
478fa03b | 1971 | |
fdb3c177 RW |
1972 | ec = acpi_ec_alloc(); |
1973 | if (!ec) | |
f900bf49 | 1974 | goto out; |
fdb3c177 | 1975 | |
59f0aa94 | 1976 | if (EC_FLAGS_CORRECT_ECDT) { |
fd6231e7 LZ |
1977 | ec->command_addr = ecdt_ptr->data.address; |
1978 | ec->data_addr = ecdt_ptr->control.address; | |
c6cb0e87 | 1979 | } else { |
fd6231e7 LZ |
1980 | ec->command_addr = ecdt_ptr->control.address; |
1981 | ec->data_addr = ecdt_ptr->data.address; | |
c6cb0e87 | 1982 | } |
406857f7 DD |
1983 | |
1984 | /* | |
1985 | * Ignore the GPE value on Reduced Hardware platforms. | |
1986 | * Some products have this set to an erroneous value. | |
1987 | */ | |
1988 | if (!acpi_gbl_reduced_hardware) | |
1989 | ec->gpe = ecdt_ptr->gpe; | |
1990 | ||
1568426c | 1991 | ec->handle = ACPI_ROOT_OBJECT; |
2a570840 LZ |
1992 | |
1993 | /* | |
1994 | * At this point, the namespace is not initialized, so do not find | |
1995 | * the namespace objects, or handle the events. | |
1996 | */ | |
ab4620f5 | 1997 | ret = acpi_ec_setup(ec, NULL, false); |
1568426c | 1998 | if (ret) { |
72c77b7e | 1999 | acpi_ec_free(ec); |
f900bf49 | 2000 | goto out; |
1568426c RW |
2001 | } |
2002 | ||
2003 | boot_ec = ec; | |
2004 | boot_ec_is_ecdt = true; | |
2005 | ||
2006 | pr_info("Boot ECDT EC used to handle transactions\n"); | |
f900bf49 HG |
2007 | |
2008 | out: | |
2009 | acpi_put_table((struct acpi_table_header *)ecdt_ptr); | |
1da177e4 LT |
2010 | } |
2011 | ||
df45db61 | 2012 | #ifdef CONFIG_PM_SLEEP |
39a2a2aa LZ |
2013 | static int acpi_ec_suspend(struct device *dev) |
2014 | { | |
2015 | struct acpi_ec *ec = | |
2016 | acpi_driver_data(to_acpi_device(dev)); | |
2017 | ||
6e86633a | 2018 | if (!pm_suspend_no_platform() && ec_freeze_events) |
39a2a2aa LZ |
2019 | acpi_ec_disable_event(ec); |
2020 | return 0; | |
2021 | } | |
2022 | ||
76380636 RW |
2023 | static int acpi_ec_suspend_noirq(struct device *dev) |
2024 | { | |
2025 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); | |
2026 | ||
2027 | /* | |
2028 | * The SCI handler doesn't run at this point, so the GPE can be | |
2029 | * masked at the low level without side effects. | |
2030 | */ | |
2031 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
406857f7 | 2032 | ec->gpe >= 0 && ec->reference_count >= 1) |
76380636 RW |
2033 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
2034 | ||
fcd0a042 | 2035 | acpi_ec_enter_noirq(ec); |
3cd091a7 | 2036 | |
76380636 RW |
2037 | return 0; |
2038 | } | |
2039 | ||
2040 | static int acpi_ec_resume_noirq(struct device *dev) | |
2041 | { | |
2042 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); | |
2043 | ||
fcd0a042 | 2044 | acpi_ec_leave_noirq(ec); |
3cd091a7 | 2045 | |
76380636 | 2046 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && |
406857f7 | 2047 | ec->gpe >= 0 && ec->reference_count >= 1) |
76380636 RW |
2048 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
2049 | ||
2050 | return 0; | |
2051 | } | |
2052 | ||
c2b46d67 LZ |
2053 | static int acpi_ec_resume(struct device *dev) |
2054 | { | |
2055 | struct acpi_ec *ec = | |
2056 | acpi_driver_data(to_acpi_device(dev)); | |
2057 | ||
2058 | acpi_ec_enable_event(ec); | |
2059 | return 0; | |
2060 | } | |
d7589404 RW |
2061 | |
2062 | void acpi_ec_mark_gpe_for_wake(void) | |
2063 | { | |
2064 | if (first_ec && !ec_no_wakeup) | |
2065 | acpi_mark_gpe_for_wake(NULL, first_ec->gpe); | |
2066 | } | |
2067 | EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake); | |
2068 | ||
2069 | void acpi_ec_set_gpe_wake_mask(u8 action) | |
2070 | { | |
2071 | if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup) | |
2072 | acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action); | |
2073 | } | |
d7589404 | 2074 | |
9aa60f3c RW |
2075 | static bool acpi_ec_work_in_progress(struct acpi_ec *ec) |
2076 | { | |
2077 | return ec->events_in_progress + ec->queries_in_progress > 0; | |
2078 | } | |
2079 | ||
d7589404 RW |
2080 | bool acpi_ec_dispatch_gpe(void) |
2081 | { | |
ca8283dc | 2082 | bool work_in_progress = false; |
d7589404 RW |
2083 | |
2084 | if (!first_ec) | |
7b301750 RW |
2085 | return acpi_any_gpe_status_set(U32_MAX); |
2086 | ||
2087 | /* | |
2088 | * Report wakeup if the status bit is set for any enabled GPE other | |
2089 | * than the EC one. | |
2090 | */ | |
2091 | if (acpi_any_gpe_status_set(first_ec->gpe)) | |
2092 | return true; | |
2093 | ||
dc0075ba RW |
2094 | /* |
2095 | * Cancel the SCI wakeup and process all pending events in case there | |
2096 | * are any wakeup ones in there. | |
2097 | * | |
2098 | * Note that if any non-EC GPEs are active at this point, the SCI will | |
2099 | * retrigger after the rearming in acpi_s2idle_wake(), so no events | |
2100 | * should be missed by canceling the wakeup here. | |
2101 | */ | |
2102 | pm_system_cancel_wakeup(); | |
2103 | ||
7b301750 RW |
2104 | /* |
2105 | * Dispatch the EC GPE in-band, but do not report wakeup in any case | |
2106 | * to allow the caller to process events properly after that. | |
2107 | */ | |
e0359f15 | 2108 | spin_lock_irq(&first_ec->lock); |
ca8283dc | 2109 | |
977dc308 RW |
2110 | if (acpi_ec_gpe_status_set(first_ec)) { |
2111 | pm_pr_dbg("ACPI EC GPE status set\n"); | |
2112 | ||
b5539eb5 | 2113 | clear_gpe_and_advance_transaction(first_ec, false); |
9aa60f3c | 2114 | work_in_progress = acpi_ec_work_in_progress(first_ec); |
977dc308 | 2115 | } |
ca8283dc | 2116 | |
e0359f15 | 2117 | spin_unlock_irq(&first_ec->lock); |
ca8283dc RW |
2118 | |
2119 | if (!work_in_progress) | |
2120 | return false; | |
2121 | ||
2122 | pm_pr_dbg("ACPI EC GPE dispatched\n"); | |
7b301750 | 2123 | |
4a9af6ca RW |
2124 | /* Drain EC work. */ |
2125 | do { | |
2126 | acpi_ec_flush_work(); | |
2127 | ||
2128 | pm_pr_dbg("ACPI EC work flushed\n"); | |
2129 | ||
e0359f15 | 2130 | spin_lock_irq(&first_ec->lock); |
4a9af6ca | 2131 | |
9aa60f3c | 2132 | work_in_progress = acpi_ec_work_in_progress(first_ec); |
4a9af6ca | 2133 | |
e0359f15 | 2134 | spin_unlock_irq(&first_ec->lock); |
4a9af6ca | 2135 | } while (work_in_progress && !pm_wakeup_pending()); |
607b9df6 | 2136 | |
29113f2f | 2137 | return false; |
d7589404 RW |
2138 | } |
2139 | #endif /* CONFIG_PM_SLEEP */ | |
df45db61 LZ |
2140 | |
2141 | static const struct dev_pm_ops acpi_ec_pm = { | |
76380636 | 2142 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) |
39a2a2aa | 2143 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
df45db61 LZ |
2144 | }; |
2145 | ||
e4dca7b7 KC |
2146 | static int param_set_event_clearing(const char *val, |
2147 | const struct kernel_param *kp) | |
1d68d261 LZ |
2148 | { |
2149 | int result = 0; | |
2150 | ||
2151 | if (!strncmp(val, "status", sizeof("status") - 1)) { | |
2152 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
2153 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); | |
2154 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { | |
2155 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; | |
2156 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); | |
2157 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { | |
2158 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; | |
2159 | pr_info("Assuming SCI_EVT clearing on event reads\n"); | |
2160 | } else | |
2161 | result = -EINVAL; | |
2162 | return result; | |
2163 | } | |
2164 | ||
e4dca7b7 KC |
2165 | static int param_get_event_clearing(char *buffer, |
2166 | const struct kernel_param *kp) | |
1d68d261 LZ |
2167 | { |
2168 | switch (ec_event_clearing) { | |
2169 | case ACPI_EC_EVT_TIMING_STATUS: | |
fc293b7a | 2170 | return sprintf(buffer, "status\n"); |
1d68d261 | 2171 | case ACPI_EC_EVT_TIMING_QUERY: |
fc293b7a | 2172 | return sprintf(buffer, "query\n"); |
1d68d261 | 2173 | case ACPI_EC_EVT_TIMING_EVENT: |
fc293b7a | 2174 | return sprintf(buffer, "event\n"); |
1d68d261 | 2175 | default: |
fc293b7a | 2176 | return sprintf(buffer, "invalid\n"); |
1d68d261 LZ |
2177 | } |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, | |
2182 | NULL, 0644); | |
2183 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); | |
2184 | ||
223883b7 AS |
2185 | static struct acpi_driver acpi_ec_driver = { |
2186 | .name = "ec", | |
2187 | .class = ACPI_EC_CLASS, | |
2188 | .ids = ec_device_ids, | |
2189 | .ops = { | |
2190 | .add = acpi_ec_add, | |
2191 | .remove = acpi_ec_remove, | |
223883b7 | 2192 | }, |
df45db61 | 2193 | .drv.pm = &acpi_ec_pm, |
223883b7 AS |
2194 | }; |
2195 | ||
f0ac20c3 | 2196 | static void acpi_ec_destroy_workqueues(void) |
e1191bd4 | 2197 | { |
f0ac20c3 RW |
2198 | if (ec_wq) { |
2199 | destroy_workqueue(ec_wq); | |
2200 | ec_wq = NULL; | |
e1191bd4 | 2201 | } |
e1191bd4 LZ |
2202 | if (ec_query_wq) { |
2203 | destroy_workqueue(ec_query_wq); | |
2204 | ec_query_wq = NULL; | |
2205 | } | |
2206 | } | |
2207 | ||
f0ac20c3 RW |
2208 | static int acpi_ec_init_workqueues(void) |
2209 | { | |
2210 | if (!ec_wq) | |
2211 | ec_wq = alloc_ordered_workqueue("kec", 0); | |
2212 | ||
2213 | if (!ec_query_wq) | |
2214 | ec_query_wq = alloc_workqueue("kec_query", 0, ec_max_queries); | |
2215 | ||
2216 | if (!ec_wq || !ec_query_wq) { | |
2217 | acpi_ec_destroy_workqueues(); | |
2218 | return -ENODEV; | |
2219 | } | |
2220 | return 0; | |
2221 | } | |
2222 | ||
8195a655 MW |
2223 | static const struct dmi_system_id acpi_ec_no_wakeup[] = { |
2224 | { | |
8195a655 MW |
2225 | .matches = { |
2226 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
2c4d6baf | 2227 | DMI_MATCH(DMI_PRODUCT_FAMILY, "Thinkpad X1 Carbon 6th"), |
8195a655 MW |
2228 | }, |
2229 | }, | |
b047c62e | 2230 | { |
b047c62e AM |
2231 | .matches = { |
2232 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
2233 | DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"), | |
2234 | }, | |
2235 | }, | |
eb794e3c | 2236 | { |
eb794e3c BZ |
2237 | .matches = { |
2238 | DMI_MATCH(DMI_SYS_VENDOR, "HP"), | |
2239 | DMI_MATCH(DMI_PRODUCT_FAMILY, "103C_5336AN HP ZHAN 66 Pro"), | |
2240 | }, | |
2241 | }, | |
8195a655 MW |
2242 | { }, |
2243 | }; | |
2244 | ||
98ada3c5 | 2245 | void __init acpi_ec_init(void) |
1da177e4 | 2246 | { |
e1191bd4 | 2247 | int result; |
1da177e4 | 2248 | |
f0ac20c3 | 2249 | result = acpi_ec_init_workqueues(); |
e1191bd4 | 2250 | if (result) |
98ada3c5 | 2251 | return; |
1da177e4 | 2252 | |
8195a655 MW |
2253 | /* |
2254 | * Disable EC wakeup on following systems to prevent periodic | |
2255 | * wakeup from EC GPE. | |
2256 | */ | |
2257 | if (dmi_check_system(acpi_ec_no_wakeup)) { | |
2258 | ec_no_wakeup = true; | |
2259 | pr_debug("Disabling EC wakeup on suspend-to-idle\n"); | |
2260 | } | |
2261 | ||
98ada3c5 RW |
2262 | /* Driver must be registered after acpi_ec_init_workqueues(). */ |
2263 | acpi_bus_register_driver(&acpi_ec_driver); | |
2264 | ||
2265 | acpi_ec_ecdt_start(); | |
1da177e4 LT |
2266 | } |
2267 | ||
1da177e4 LT |
2268 | /* EC driver currently not unloadable */ |
2269 | #if 0 | |
50526df6 | 2270 | static void __exit acpi_ec_exit(void) |
1da177e4 | 2271 | { |
1da177e4 LT |
2272 | |
2273 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
f0ac20c3 | 2274 | acpi_ec_destroy_workqueues(); |
1da177e4 | 2275 | } |
7843932a | 2276 | #endif /* 0 */ |