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1da177e4 | 1 | /* |
a8d4fc22 | 2 | * ec.c - ACPI Embedded Controller Driver (v3) |
1da177e4 | 3 | * |
a8d4fc22 LZ |
4 | * Copyright (C) 2001-2015 Intel Corporation |
5 | * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> | |
4a3f6b5b LZ |
6 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
7 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> | |
8 | * 2004 Luming Yu <luming.yu@intel.com> | |
9 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
10 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
11 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> | |
1da177e4 LT |
12 | * |
13 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or (at | |
18 | * your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, but | |
21 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | * General Public License for more details. | |
24 | * | |
1da177e4 LT |
25 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
26 | */ | |
27 | ||
7c6db4e0 | 28 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 29 | /* #define DEBUG */ |
16a26e85 | 30 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 31 | |
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/delay.h> | |
451566f4 | 37 | #include <linux/interrupt.h> |
837012ed | 38 | #include <linux/list.h> |
7c6db4e0 | 39 | #include <linux/spinlock.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
8b48463f | 41 | #include <linux/acpi.h> |
eb27cae8 | 42 | #include <linux/dmi.h> |
8b48463f | 43 | #include <asm/io.h> |
1da177e4 | 44 | |
1195a098 TR |
45 | #include "internal.h" |
46 | ||
1da177e4 | 47 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
48 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
49 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 50 | |
703959d4 | 51 | /* EC status register */ |
1da177e4 LT |
52 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
53 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 54 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 57 | |
1d68d261 LZ |
58 | /* |
59 | * The SCI_EVT clearing timing is not defined by the ACPI specification. | |
60 | * This leads to lots of practical timing issues for the host EC driver. | |
61 | * The following variations are defined (from the target EC firmware's | |
62 | * perspective): | |
63 | * STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the | |
64 | * target can clear SCI_EVT at any time so long as the host can see | |
65 | * the indication by reading the status register (EC_SC). So the | |
66 | * host should re-check SCI_EVT after the first time the SCI_EVT | |
67 | * indication is seen, which is the same time the query request | |
68 | * (QR_EC) is written to the command register (EC_CMD). SCI_EVT set | |
69 | * at any later time could indicate another event. Normally such | |
70 | * kind of EC firmware has implemented an event queue and will | |
71 | * return 0x00 to indicate "no outstanding event". | |
72 | * QUERY: After seeing the query request (QR_EC) written to the command | |
73 | * register (EC_CMD) by the host and having prepared the responding | |
74 | * event value in the data register (EC_DATA), the target can safely | |
75 | * clear SCI_EVT because the target can confirm that the current | |
76 | * event is being handled by the host. The host then should check | |
77 | * SCI_EVT right after reading the event response from the data | |
78 | * register (EC_DATA). | |
79 | * EVENT: After seeing the event response read from the data register | |
80 | * (EC_DATA) by the host, the target can clear SCI_EVT. As the | |
81 | * target requires time to notice the change in the data register | |
82 | * (EC_DATA), the host may be required to wait additional guarding | |
83 | * time before checking the SCI_EVT again. Such guarding may not be | |
84 | * necessary if the host is notified via another IRQ. | |
85 | */ | |
86 | #define ACPI_EC_EVT_TIMING_STATUS 0x00 | |
87 | #define ACPI_EC_EVT_TIMING_QUERY 0x01 | |
88 | #define ACPI_EC_EVT_TIMING_EVENT 0x02 | |
89 | ||
703959d4 | 90 | /* EC commands */ |
3261ff4d | 91 | enum ec_command { |
6ccedb10 AS |
92 | ACPI_EC_COMMAND_READ = 0x80, |
93 | ACPI_EC_COMMAND_WRITE = 0x81, | |
94 | ACPI_EC_BURST_ENABLE = 0x82, | |
95 | ACPI_EC_BURST_DISABLE = 0x83, | |
96 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 97 | }; |
837012ed | 98 | |
5c406412 | 99 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 100 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
d8d031a6 | 101 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
ad332c8a KC |
102 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
103 | * when trying to clear the EC */ | |
e1191bd4 | 104 | #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */ |
703959d4 | 105 | |
080e412c | 106 | enum { |
750f628b | 107 | EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ |
37d11391 | 108 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
1d68d261 | 109 | EC_FLAGS_QUERY_GUARDING, /* Guard for SCI_EVT check */ |
0e1affe4 LZ |
110 | EC_FLAGS_GPE_HANDLER_INSTALLED, /* GPE handler installed */ |
111 | EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ | |
2a570840 | 112 | EC_FLAGS_EVT_HANDLER_INSTALLED, /* _Qxx handlers installed */ |
ad479e7f LZ |
113 | EC_FLAGS_STARTED, /* Driver is started */ |
114 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
115 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
116 | * current command processing */ | |
1da177e4 | 117 | }; |
6ffb221a | 118 | |
f92fca00 LZ |
119 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
120 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
121 | ||
7a18e96d TR |
122 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
123 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
124 | module_param(ec_delay, uint, 0644); | |
125 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
126 | ||
e1191bd4 LZ |
127 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
128 | module_param(ec_max_queries, uint, 0644); | |
129 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); | |
130 | ||
15de603b LZ |
131 | static bool ec_busy_polling __read_mostly; |
132 | module_param(ec_busy_polling, bool, 0644); | |
133 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); | |
134 | ||
135 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; | |
136 | module_param(ec_polling_guard, uint, 0644); | |
137 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); | |
138 | ||
3cb02aeb | 139 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
1d68d261 | 140 | |
a520d52e FT |
141 | /* |
142 | * If the number of false interrupts per one transaction exceeds | |
143 | * this threshold, will think there is a GPE storm happened and | |
144 | * will disable the GPE for normal transaction. | |
145 | */ | |
146 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
147 | module_param(ec_storm_threshold, uint, 0644); | |
148 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
149 | ||
d3028305 | 150 | static bool ec_freeze_events __read_mostly = true; |
39a2a2aa LZ |
151 | module_param(ec_freeze_events, bool, 0644); |
152 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); | |
153 | ||
837012ed AS |
154 | struct acpi_ec_query_handler { |
155 | struct list_head node; | |
156 | acpi_ec_query_func func; | |
157 | acpi_handle handle; | |
158 | void *data; | |
159 | u8 query_bit; | |
01305d41 | 160 | struct kref kref; |
837012ed AS |
161 | }; |
162 | ||
8463200a | 163 | struct transaction { |
7c6db4e0 AS |
164 | const u8 *wdata; |
165 | u8 *rdata; | |
166 | unsigned short irq_count; | |
8463200a | 167 | u8 command; |
a2f93aea AS |
168 | u8 wi; |
169 | u8 ri; | |
7c6db4e0 AS |
170 | u8 wlen; |
171 | u8 rlen; | |
f92fca00 | 172 | u8 flags; |
7c6db4e0 AS |
173 | }; |
174 | ||
02b771b6 LZ |
175 | struct acpi_ec_query { |
176 | struct transaction transaction; | |
177 | struct work_struct work; | |
178 | struct acpi_ec_query_handler *handler; | |
179 | }; | |
180 | ||
550b3aac | 181 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 182 | static void advance_transaction(struct acpi_ec *ec); |
02b771b6 LZ |
183 | static void acpi_ec_event_handler(struct work_struct *work); |
184 | static void acpi_ec_event_processor(struct work_struct *work); | |
74443bbe | 185 | |
1195a098 TR |
186 | struct acpi_ec *boot_ec, *first_ec; |
187 | EXPORT_SYMBOL(first_ec); | |
72c77b7e | 188 | static bool boot_ec_is_ecdt = false; |
e1191bd4 | 189 | static struct workqueue_struct *ec_query_wq; |
703959d4 | 190 | |
ad332c8a | 191 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 192 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
59f0aa94 | 193 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
5423a0cb | 194 | |
3535a3c1 LZ |
195 | /* -------------------------------------------------------------------------- |
196 | * Logging/Debugging | |
197 | * -------------------------------------------------------------------------- */ | |
198 | ||
199 | /* | |
200 | * Splitters used by the developers to track the boundary of the EC | |
201 | * handling processes. | |
202 | */ | |
203 | #ifdef DEBUG | |
204 | #define EC_DBG_SEP " " | |
205 | #define EC_DBG_DRV "+++++" | |
206 | #define EC_DBG_STM "=====" | |
207 | #define EC_DBG_REQ "*****" | |
208 | #define EC_DBG_EVT "#####" | |
209 | #else | |
210 | #define EC_DBG_SEP "" | |
211 | #define EC_DBG_DRV | |
212 | #define EC_DBG_STM | |
213 | #define EC_DBG_REQ | |
214 | #define EC_DBG_EVT | |
215 | #endif | |
216 | ||
217 | #define ec_log_raw(fmt, ...) \ | |
218 | pr_info(fmt "\n", ##__VA_ARGS__) | |
219 | #define ec_dbg_raw(fmt, ...) \ | |
220 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
221 | #define ec_log(filter, fmt, ...) \ | |
222 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
223 | #define ec_dbg(filter, fmt, ...) \ | |
224 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
225 | ||
226 | #define ec_log_drv(fmt, ...) \ | |
227 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
228 | #define ec_dbg_drv(fmt, ...) \ | |
229 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
230 | #define ec_dbg_stm(fmt, ...) \ | |
231 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
232 | #define ec_dbg_req(fmt, ...) \ | |
233 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
234 | #define ec_dbg_evt(fmt, ...) \ | |
235 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
236 | #define ec_dbg_ref(ec, fmt, ...) \ |
237 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 238 | |
ad479e7f LZ |
239 | /* -------------------------------------------------------------------------- |
240 | * Device Flags | |
241 | * -------------------------------------------------------------------------- */ | |
242 | ||
243 | static bool acpi_ec_started(struct acpi_ec *ec) | |
244 | { | |
245 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
246 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
247 | } | |
248 | ||
750f628b LZ |
249 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
250 | { | |
251 | /* | |
252 | * There is an OSPM early stage logic. During the early stages | |
253 | * (boot/resume), OSPMs shouldn't enable the event handling, only | |
254 | * the EC transactions are allowed to be performed. | |
255 | */ | |
256 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
257 | return false; | |
258 | /* | |
39a2a2aa LZ |
259 | * However, disabling the event handling is experimental for late |
260 | * stage (suspend), and is controlled by the boot parameter of | |
261 | * "ec_freeze_events": | |
262 | * 1. true: The EC event handling is disabled before entering | |
263 | * the noirq stage. | |
264 | * 2. false: The EC event handling is automatically disabled as | |
265 | * soon as the EC driver is stopped. | |
750f628b | 266 | */ |
39a2a2aa LZ |
267 | if (ec_freeze_events) |
268 | return acpi_ec_started(ec); | |
269 | else | |
270 | return test_bit(EC_FLAGS_STARTED, &ec->flags); | |
750f628b LZ |
271 | } |
272 | ||
9887d22a LZ |
273 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
274 | { | |
275 | return ec->reference_count == 1; | |
276 | } | |
277 | ||
1da177e4 | 278 | /* -------------------------------------------------------------------------- |
ca37bfdf | 279 | * EC Registers |
7a73e60e | 280 | * -------------------------------------------------------------------------- */ |
1da177e4 | 281 | |
6ffb221a | 282 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 283 | { |
3ebe08a7 | 284 | u8 x = inb(ec->command_addr); |
7a73e60e | 285 | |
3535a3c1 LZ |
286 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
287 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
288 | x, | |
289 | !!(x & ACPI_EC_FLAG_SCI), | |
290 | !!(x & ACPI_EC_FLAG_BURST), | |
291 | !!(x & ACPI_EC_FLAG_CMD), | |
292 | !!(x & ACPI_EC_FLAG_IBF), | |
293 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 294 | return x; |
451566f4 DT |
295 | } |
296 | ||
6ffb221a | 297 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 298 | { |
3ebe08a7 | 299 | u8 x = inb(ec->data_addr); |
7a73e60e | 300 | |
d8d031a6 | 301 | ec->timestamp = jiffies; |
3535a3c1 | 302 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 303 | return x; |
7c6db5e5 DS |
304 | } |
305 | ||
6ffb221a | 306 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 307 | { |
3535a3c1 | 308 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 309 | outb(command, ec->command_addr); |
d8d031a6 | 310 | ec->timestamp = jiffies; |
45bea155 LY |
311 | } |
312 | ||
6ffb221a | 313 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 314 | { |
3535a3c1 | 315 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 316 | outb(data, ec->data_addr); |
d8d031a6 | 317 | ec->timestamp = jiffies; |
703959d4 | 318 | } |
45bea155 | 319 | |
e34c0e2b LZ |
320 | #ifdef DEBUG |
321 | static const char *acpi_ec_cmd_string(u8 cmd) | |
322 | { | |
323 | switch (cmd) { | |
324 | case 0x80: | |
325 | return "RD_EC"; | |
326 | case 0x81: | |
327 | return "WR_EC"; | |
328 | case 0x82: | |
329 | return "BE_EC"; | |
330 | case 0x83: | |
331 | return "BD_EC"; | |
332 | case 0x84: | |
333 | return "QR_EC"; | |
334 | } | |
335 | return "UNKNOWN"; | |
336 | } | |
337 | #else | |
338 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
339 | #endif | |
340 | ||
ca37bfdf LZ |
341 | /* -------------------------------------------------------------------------- |
342 | * GPE Registers | |
343 | * -------------------------------------------------------------------------- */ | |
344 | ||
345 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
346 | { | |
347 | acpi_event_status gpe_status = 0; | |
348 | ||
349 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 350 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
351 | } |
352 | ||
353 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
354 | { | |
355 | if (open) | |
356 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
357 | else { |
358 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 359 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 360 | } |
ca37bfdf LZ |
361 | if (acpi_ec_is_gpe_raised(ec)) { |
362 | /* | |
363 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
364 | * software need to manually trigger a pseudo GPE event on | |
365 | * EN=1 writes. | |
366 | */ | |
3535a3c1 | 367 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
368 | advance_transaction(ec); |
369 | } | |
370 | } | |
371 | ||
372 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
373 | { | |
374 | if (close) | |
375 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
376 | else { |
377 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 378 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 379 | } |
ca37bfdf LZ |
380 | } |
381 | ||
382 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
383 | { | |
384 | /* | |
385 | * GPE STS is a W1C register, which means: | |
386 | * 1. Software can clear it without worrying about clearing other | |
387 | * GPEs' STS bits when the hardware sets them in parallel. | |
388 | * 2. As long as software can ensure only clearing it when it is | |
389 | * set, hardware won't set it in parallel. | |
390 | * So software can clear GPE in any contexts. | |
391 | * Warning: do not move the check into advance_transaction() as the | |
392 | * EC commands will be sent without GPE raised. | |
393 | */ | |
394 | if (!acpi_ec_is_gpe_raised(ec)) | |
395 | return; | |
396 | acpi_clear_gpe(NULL, ec->gpe); | |
397 | } | |
398 | ||
399 | /* -------------------------------------------------------------------------- | |
400 | * Transaction Management | |
401 | * -------------------------------------------------------------------------- */ | |
402 | ||
9887d22a LZ |
403 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
404 | { | |
405 | ec->reference_count++; | |
0e1affe4 LZ |
406 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
407 | ec->reference_count == 1) | |
9887d22a LZ |
408 | acpi_ec_enable_gpe(ec, true); |
409 | } | |
410 | ||
411 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
412 | { | |
413 | bool flushed = false; | |
414 | ||
415 | ec->reference_count--; | |
0e1affe4 LZ |
416 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
417 | ec->reference_count == 0) | |
9887d22a LZ |
418 | acpi_ec_disable_gpe(ec, true); |
419 | flushed = acpi_ec_flushed(ec); | |
420 | if (flushed) | |
421 | wake_up(&ec->wait); | |
422 | } | |
423 | ||
e1d4d90f LZ |
424 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
425 | { | |
426 | if (!test_bit(flag, &ec->flags)) { | |
427 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 428 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
429 | set_bit(flag, &ec->flags); |
430 | } | |
431 | } | |
432 | ||
433 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
434 | { | |
435 | if (test_bit(flag, &ec->flags)) { | |
436 | clear_bit(flag, &ec->flags); | |
437 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 438 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
439 | } |
440 | } | |
441 | ||
9887d22a LZ |
442 | /* |
443 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
444 | * the flush operation is not in | |
445 | * progress | |
446 | * @ec: the EC device | |
447 | * | |
448 | * This function must be used before taking a new action that should hold | |
449 | * the reference count. If this function returns false, then the action | |
450 | * must be discarded or it will prevent the flush operation from being | |
451 | * completed. | |
452 | */ | |
37d11391 | 453 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 454 | { |
37d11391 RW |
455 | if (!acpi_ec_started(ec)) |
456 | return false; | |
9887d22a LZ |
457 | acpi_ec_submit_request(ec); |
458 | return true; | |
459 | } | |
460 | ||
37d11391 | 461 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 462 | { |
750f628b LZ |
463 | if (acpi_ec_event_enabled(ec) && |
464 | !test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
9d8993be LZ |
465 | ec_dbg_evt("Command(%s) submitted/blocked", |
466 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
467 | ec->nr_pending_queries++; | |
74443bbe LZ |
468 | schedule_work(&ec->work); |
469 | } | |
470 | } | |
471 | ||
37d11391 | 472 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe | 473 | { |
f8b8eb71 | 474 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
37d11391 | 475 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
9d8993be LZ |
476 | ec_dbg_evt("Command(%s) unblocked", |
477 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
74443bbe LZ |
478 | } |
479 | } | |
480 | ||
750f628b LZ |
481 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
482 | { | |
483 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
484 | ec_log_drv("event unblocked"); | |
e923e8e7 LZ |
485 | if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
486 | advance_transaction(ec); | |
750f628b LZ |
487 | } |
488 | ||
489 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) | |
490 | { | |
491 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
492 | ec_log_drv("event blocked"); | |
493 | } | |
494 | ||
495 | /* | |
496 | * Process _Q events that might have accumulated in the EC. | |
497 | * Run with locked ec mutex. | |
498 | */ | |
499 | static void acpi_ec_clear(struct acpi_ec *ec) | |
500 | { | |
501 | int i, status; | |
502 | u8 value = 0; | |
503 | ||
504 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
505 | status = acpi_ec_query(ec, &value); | |
506 | if (status || !value) | |
507 | break; | |
508 | } | |
509 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
510 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
511 | else | |
512 | pr_info("%d stale EC events cleared\n", i); | |
513 | } | |
514 | ||
515 | static void acpi_ec_enable_event(struct acpi_ec *ec) | |
516 | { | |
517 | unsigned long flags; | |
518 | ||
519 | spin_lock_irqsave(&ec->lock, flags); | |
520 | if (acpi_ec_started(ec)) | |
521 | __acpi_ec_enable_event(ec); | |
522 | spin_unlock_irqrestore(&ec->lock, flags); | |
523 | ||
524 | /* Drain additional events if hardware requires that */ | |
525 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
526 | acpi_ec_clear(ec); | |
527 | } | |
528 | ||
eab05ec3 | 529 | #ifdef CONFIG_PM_SLEEP |
39a2a2aa LZ |
530 | static bool acpi_ec_query_flushed(struct acpi_ec *ec) |
531 | { | |
532 | bool flushed; | |
533 | unsigned long flags; | |
534 | ||
535 | spin_lock_irqsave(&ec->lock, flags); | |
536 | flushed = !ec->nr_pending_queries; | |
537 | spin_unlock_irqrestore(&ec->lock, flags); | |
538 | return flushed; | |
539 | } | |
540 | ||
541 | static void __acpi_ec_flush_event(struct acpi_ec *ec) | |
542 | { | |
543 | /* | |
544 | * When ec_freeze_events is true, we need to flush events in | |
545 | * the proper position before entering the noirq stage. | |
546 | */ | |
547 | wait_event(ec->wait, acpi_ec_query_flushed(ec)); | |
548 | if (ec_query_wq) | |
549 | flush_workqueue(ec_query_wq); | |
550 | } | |
551 | ||
552 | static void acpi_ec_disable_event(struct acpi_ec *ec) | |
553 | { | |
554 | unsigned long flags; | |
555 | ||
556 | spin_lock_irqsave(&ec->lock, flags); | |
557 | __acpi_ec_disable_event(ec); | |
558 | spin_unlock_irqrestore(&ec->lock, flags); | |
559 | __acpi_ec_flush_event(ec); | |
560 | } | |
eab05ec3 | 561 | #endif /* CONFIG_PM_SLEEP */ |
39a2a2aa | 562 | |
1d68d261 LZ |
563 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
564 | { | |
61197547 LZ |
565 | bool guarded = true; |
566 | unsigned long flags; | |
567 | ||
568 | spin_lock_irqsave(&ec->lock, flags); | |
569 | /* | |
570 | * If firmware SCI_EVT clearing timing is "event", we actually | |
571 | * don't know when the SCI_EVT will be cleared by firmware after | |
572 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an | |
573 | * acceptable period. | |
574 | * | |
575 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is | |
576 | * flagged, which means SCI_EVT check has just been performed. | |
577 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the | |
578 | * guarding should have already been performed (via | |
579 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the | |
580 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into | |
581 | * ACPI_EC_COMMAND_POLL state immediately. | |
582 | */ | |
1d68d261 LZ |
583 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
584 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || | |
585 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || | |
586 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) | |
61197547 LZ |
587 | guarded = false; |
588 | spin_unlock_irqrestore(&ec->lock, flags); | |
589 | return guarded; | |
1d68d261 LZ |
590 | } |
591 | ||
d8d031a6 LZ |
592 | static int ec_transaction_polled(struct acpi_ec *ec) |
593 | { | |
594 | unsigned long flags; | |
595 | int ret = 0; | |
596 | ||
597 | spin_lock_irqsave(&ec->lock, flags); | |
598 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
599 | ret = 1; | |
600 | spin_unlock_irqrestore(&ec->lock, flags); | |
601 | return ret; | |
602 | } | |
603 | ||
f92fca00 | 604 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 605 | { |
7c6db4e0 AS |
606 | unsigned long flags; |
607 | int ret = 0; | |
7a73e60e | 608 | |
f351d027 | 609 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 610 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 611 | ret = 1; |
f351d027 | 612 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 613 | return ret; |
45bea155 | 614 | } |
451566f4 | 615 | |
f8b8eb71 LZ |
616 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
617 | { | |
618 | ec->curr->flags |= flag; | |
619 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
1d68d261 LZ |
620 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
621 | flag == ACPI_EC_COMMAND_POLL) | |
622 | acpi_ec_complete_query(ec); | |
623 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && | |
624 | flag == ACPI_EC_COMMAND_COMPLETE) | |
f8b8eb71 | 625 | acpi_ec_complete_query(ec); |
1d68d261 LZ |
626 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
627 | flag == ACPI_EC_COMMAND_COMPLETE) | |
628 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); | |
f8b8eb71 LZ |
629 | } |
630 | } | |
631 | ||
0c78808f | 632 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 633 | { |
36b15875 | 634 | struct transaction *t; |
66b42b78 | 635 | u8 status; |
c0d65341 | 636 | bool wakeup = false; |
b76b51ba | 637 | |
3535a3c1 LZ |
638 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
639 | smp_processor_id()); | |
ca37bfdf LZ |
640 | /* |
641 | * By always clearing STS before handling all indications, we can | |
642 | * ensure a hardware STS 0->1 change after this clearing can always | |
643 | * trigger a GPE interrupt. | |
644 | */ | |
645 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 646 | status = acpi_ec_read_status(ec); |
36b15875 | 647 | t = ec->curr; |
1d68d261 LZ |
648 | /* |
649 | * Another IRQ or a guarded polling mode advancement is detected, | |
650 | * the next QR_EC submission is then allowed. | |
651 | */ | |
652 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { | |
653 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && | |
66db3834 LZ |
654 | (!ec->nr_pending_queries || |
655 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { | |
1d68d261 LZ |
656 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
657 | acpi_ec_complete_query(ec); | |
658 | } | |
659 | } | |
b76b51ba | 660 | if (!t) |
f92fca00 LZ |
661 | goto err; |
662 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
663 | if (t->wlen > t->wi) { | |
664 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
665 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
666 | else | |
667 | goto err; | |
668 | } else if (t->rlen > t->ri) { | |
669 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
670 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 671 | if (t->rlen == t->ri) { |
f8b8eb71 | 672 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
3afcf2ec | 673 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
674 | ec_dbg_evt("Command(%s) completed by hardware", |
675 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 LZ |
676 | wakeup = true; |
677 | } | |
f92fca00 LZ |
678 | } else |
679 | goto err; | |
680 | } else if (t->wlen == t->wi && | |
c0d65341 | 681 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f8b8eb71 | 682 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
683 | wakeup = true; |
684 | } | |
0c78808f | 685 | goto out; |
f92fca00 | 686 | } else { |
79149001 LZ |
687 | if (EC_FLAGS_QUERY_HANDSHAKE && |
688 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec | 689 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
f8b8eb71 | 690 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
3afcf2ec | 691 | t->rdata[t->ri++] = 0x00; |
f8b8eb71 | 692 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
9d8993be LZ |
693 | ec_dbg_evt("Command(%s) completed by software", |
694 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
3afcf2ec LZ |
695 | wakeup = true; |
696 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 | 697 | acpi_ec_write_cmd(ec, t->command); |
f8b8eb71 | 698 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
7c6db4e0 | 699 | } else |
dd15f8c4 | 700 | goto err; |
0c78808f | 701 | goto out; |
f92fca00 | 702 | } |
dd15f8c4 | 703 | err: |
a3cd8d27 FT |
704 | /* |
705 | * If SCI bit is set, then don't think it's a false IRQ | |
706 | * otherwise will take a not handled IRQ as a false one. | |
707 | */ | |
f92fca00 | 708 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
709 | if (in_interrupt() && t) { |
710 | if (t->irq_count < ec_storm_threshold) | |
711 | ++t->irq_count; | |
712 | /* Allow triggering on 0 threshold */ | |
713 | if (t->irq_count == ec_storm_threshold) | |
714 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
715 | } | |
f92fca00 | 716 | } |
0c78808f | 717 | out: |
74443bbe | 718 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 719 | acpi_ec_submit_query(ec); |
0c78808f LZ |
720 | if (wakeup && in_interrupt()) |
721 | wake_up(&ec->wait); | |
f92fca00 | 722 | } |
a3cd8d27 | 723 | |
f92fca00 LZ |
724 | static void start_transaction(struct acpi_ec *ec) |
725 | { | |
726 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
727 | ec->curr->flags = 0; | |
d8d031a6 LZ |
728 | } |
729 | ||
730 | static int ec_guard(struct acpi_ec *ec) | |
731 | { | |
15de603b | 732 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
d8d031a6 LZ |
733 | unsigned long timeout = ec->timestamp + guard; |
734 | ||
61197547 | 735 | /* Ensure guarding period before polling EC status */ |
d8d031a6 | 736 | do { |
15de603b | 737 | if (ec_busy_polling) { |
d8d031a6 LZ |
738 | /* Perform busy polling */ |
739 | if (ec_transaction_completed(ec)) | |
740 | return 0; | |
741 | udelay(jiffies_to_usecs(guard)); | |
742 | } else { | |
743 | /* | |
744 | * Perform wait polling | |
61197547 LZ |
745 | * 1. Wait the transaction to be completed by the |
746 | * GPE handler after the transaction enters | |
747 | * ACPI_EC_COMMAND_POLL state. | |
748 | * 2. A special guarding logic is also required | |
749 | * for event clearing mode "event" before the | |
750 | * transaction enters ACPI_EC_COMMAND_POLL | |
751 | * state. | |
d8d031a6 | 752 | */ |
1d68d261 LZ |
753 | if (!ec_transaction_polled(ec) && |
754 | !acpi_ec_guard_event(ec)) | |
d8d031a6 LZ |
755 | break; |
756 | if (wait_event_timeout(ec->wait, | |
757 | ec_transaction_completed(ec), | |
758 | guard)) | |
759 | return 0; | |
760 | } | |
d8d031a6 LZ |
761 | } while (time_before(jiffies, timeout)); |
762 | return -ETIME; | |
845625cd | 763 | } |
03d1d99c | 764 | |
7c6db4e0 AS |
765 | static int ec_poll(struct acpi_ec *ec) |
766 | { | |
2a84cb98 | 767 | unsigned long flags; |
28fe5c82 | 768 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 769 | |
2a84cb98 AS |
770 | while (repeat--) { |
771 | unsigned long delay = jiffies + | |
7a18e96d | 772 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 773 | do { |
d8d031a6 LZ |
774 | if (!ec_guard(ec)) |
775 | return 0; | |
f92fca00 | 776 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 777 | advance_transaction(ec); |
f92fca00 | 778 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 779 | } while (time_before(jiffies, delay)); |
16a26e85 | 780 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 781 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 782 | start_transaction(ec); |
f351d027 | 783 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 784 | } |
b77d81b2 | 785 | return -ETIME; |
1da177e4 LT |
786 | } |
787 | ||
8463200a | 788 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 789 | struct transaction *t) |
45bea155 | 790 | { |
7c6db4e0 | 791 | unsigned long tmp; |
7c6db4e0 | 792 | int ret = 0; |
7a73e60e | 793 | |
7c6db4e0 | 794 | /* start transaction */ |
f351d027 | 795 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 796 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 797 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
798 | ret = -EINVAL; |
799 | goto unlock; | |
800 | } | |
770970f0 | 801 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 802 | /* following two actions should be kept atomic */ |
8463200a | 803 | ec->curr = t; |
3535a3c1 | 804 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 805 | start_transaction(ec); |
df9ff918 | 806 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 807 | |
df9ff918 | 808 | ret = ec_poll(ec); |
d8d031a6 | 809 | |
df9ff918 | 810 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
811 | if (t->irq_count == ec_storm_threshold) |
812 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 813 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 814 | ec->curr = NULL; |
9887d22a LZ |
815 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
816 | acpi_ec_complete_request(ec); | |
770970f0 | 817 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 818 | unlock: |
f351d027 | 819 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
820 | return ret; |
821 | } | |
822 | ||
2a84cb98 | 823 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 824 | { |
d7a76e4c | 825 | int status; |
50526df6 | 826 | u32 glk; |
7a73e60e | 827 | |
8463200a | 828 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 829 | return -EINVAL; |
8463200a AS |
830 | if (t->rdata) |
831 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 832 | |
f351d027 | 833 | mutex_lock(&ec->mutex); |
703959d4 | 834 | if (ec->global_lock) { |
1da177e4 | 835 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 836 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
837 | status = -ENODEV; |
838 | goto unlock; | |
c24e912b | 839 | } |
1da177e4 | 840 | } |
a62e8f19 | 841 | |
2a84cb98 | 842 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 843 | |
703959d4 | 844 | if (ec->global_lock) |
1da177e4 | 845 | acpi_release_global_lock(glk); |
7c6db4e0 | 846 | unlock: |
f351d027 | 847 | mutex_unlock(&ec->mutex); |
d550d98d | 848 | return status; |
1da177e4 LT |
849 | } |
850 | ||
8a383ef0 | 851 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
852 | { |
853 | u8 d; | |
8463200a AS |
854 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
855 | .wdata = NULL, .rdata = &d, | |
856 | .wlen = 0, .rlen = 1}; | |
857 | ||
2a84cb98 | 858 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
859 | } |
860 | ||
8a383ef0 | 861 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 862 | { |
8463200a AS |
863 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
864 | .wdata = NULL, .rdata = NULL, | |
865 | .wlen = 0, .rlen = 0}; | |
866 | ||
7c6db4e0 | 867 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 868 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
869 | } |
870 | ||
7a73e60e | 871 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
872 | { |
873 | int result; | |
874 | u8 d; | |
8463200a AS |
875 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
876 | .wdata = &address, .rdata = &d, | |
877 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 878 | |
2a84cb98 | 879 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
880 | *data = d; |
881 | return result; | |
882 | } | |
6ffb221a | 883 | |
3576cf61 DS |
884 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
885 | { | |
6ccedb10 | 886 | u8 wdata[2] = { address, data }; |
8463200a AS |
887 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
888 | .wdata = wdata, .rdata = NULL, | |
889 | .wlen = 2, .rlen = 0}; | |
890 | ||
2a84cb98 | 891 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
892 | } |
893 | ||
b76b51ba | 894 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 895 | { |
1da177e4 | 896 | int err; |
6ffb221a | 897 | u8 temp_data; |
1da177e4 LT |
898 | |
899 | if (!first_ec) | |
900 | return -ENODEV; | |
901 | ||
d033879c | 902 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
903 | |
904 | if (!err) { | |
905 | *val = temp_data; | |
906 | return 0; | |
7a73e60e LZ |
907 | } |
908 | return err; | |
1da177e4 LT |
909 | } |
910 | EXPORT_SYMBOL(ec_read); | |
911 | ||
50526df6 | 912 | int ec_write(u8 addr, u8 val) |
1da177e4 | 913 | { |
1da177e4 LT |
914 | int err; |
915 | ||
916 | if (!first_ec) | |
917 | return -ENODEV; | |
918 | ||
d033879c | 919 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
920 | |
921 | return err; | |
922 | } | |
923 | EXPORT_SYMBOL(ec_write); | |
924 | ||
616362de | 925 | int ec_transaction(u8 command, |
7a73e60e LZ |
926 | const u8 *wdata, unsigned wdata_len, |
927 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 928 | { |
8463200a AS |
929 | struct transaction t = {.command = command, |
930 | .wdata = wdata, .rdata = rdata, | |
931 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 932 | |
d7a76e4c LP |
933 | if (!first_ec) |
934 | return -ENODEV; | |
45bea155 | 935 | |
2a84cb98 | 936 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 937 | } |
ab9e43c6 LP |
938 | EXPORT_SYMBOL(ec_transaction); |
939 | ||
3e2abc5a SF |
940 | /* Get the handle to the EC device */ |
941 | acpi_handle ec_get_handle(void) | |
942 | { | |
943 | if (!first_ec) | |
944 | return NULL; | |
945 | return first_ec->handle; | |
946 | } | |
3e2abc5a SF |
947 | EXPORT_SYMBOL(ec_get_handle); |
948 | ||
ad479e7f LZ |
949 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
950 | { | |
951 | unsigned long flags; | |
952 | ||
953 | spin_lock_irqsave(&ec->lock, flags); | |
954 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 955 | ec_dbg_drv("Starting EC"); |
9887d22a | 956 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 957 | if (!resuming) { |
9887d22a | 958 | acpi_ec_submit_request(ec); |
770970f0 | 959 | ec_dbg_ref(ec, "Increase driver"); |
c2b46d67 | 960 | } |
3535a3c1 | 961 | ec_log_drv("EC started"); |
ad479e7f LZ |
962 | } |
963 | spin_unlock_irqrestore(&ec->lock, flags); | |
964 | } | |
965 | ||
9887d22a LZ |
966 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
967 | { | |
968 | unsigned long flags; | |
969 | bool flushed; | |
970 | ||
971 | spin_lock_irqsave(&ec->lock, flags); | |
972 | flushed = acpi_ec_flushed(ec); | |
973 | spin_unlock_irqrestore(&ec->lock, flags); | |
974 | return flushed; | |
975 | } | |
976 | ||
ad479e7f LZ |
977 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
978 | { | |
979 | unsigned long flags; | |
980 | ||
981 | spin_lock_irqsave(&ec->lock, flags); | |
982 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 983 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 984 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
985 | spin_unlock_irqrestore(&ec->lock, flags); |
986 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
987 | spin_lock_irqsave(&ec->lock, flags); | |
988 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 989 | if (!suspending) { |
9887d22a | 990 | acpi_ec_complete_request(ec); |
770970f0 | 991 | ec_dbg_ref(ec, "Decrease driver"); |
39a2a2aa | 992 | } else if (!ec_freeze_events) |
750f628b | 993 | __acpi_ec_disable_event(ec); |
ad479e7f LZ |
994 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
995 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 996 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
997 | } |
998 | spin_unlock_irqrestore(&ec->lock, flags); | |
999 | } | |
1000 | ||
fe955682 | 1001 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
1002 | { |
1003 | struct acpi_ec *ec = first_ec; | |
1004 | ||
1005 | if (!ec) | |
1006 | return; | |
1007 | ||
f351d027 | 1008 | mutex_lock(&ec->mutex); |
f6bb13aa | 1009 | /* Prevent transactions from being carried out */ |
ad479e7f | 1010 | acpi_ec_stop(ec, true); |
f351d027 | 1011 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
1012 | } |
1013 | ||
fe955682 | 1014 | void acpi_ec_unblock_transactions(void) |
d5a64513 RW |
1015 | { |
1016 | /* | |
1017 | * Allow transactions to happen again (this function is called from | |
1018 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
1019 | */ | |
1020 | if (first_ec) | |
ad479e7f | 1021 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
1022 | } |
1023 | ||
1da177e4 LT |
1024 | /* -------------------------------------------------------------------------- |
1025 | Event Management | |
1026 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
1027 | static struct acpi_ec_query_handler * |
1028 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
1029 | { | |
1030 | if (handler) | |
1031 | kref_get(&handler->kref); | |
1032 | return handler; | |
1033 | } | |
1034 | ||
0700c047 LZ |
1035 | static struct acpi_ec_query_handler * |
1036 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) | |
1037 | { | |
1038 | struct acpi_ec_query_handler *handler; | |
1039 | bool found = false; | |
1040 | ||
1041 | mutex_lock(&ec->mutex); | |
1042 | list_for_each_entry(handler, &ec->list, node) { | |
1043 | if (value == handler->query_bit) { | |
1044 | found = true; | |
1045 | break; | |
1046 | } | |
1047 | } | |
1048 | mutex_unlock(&ec->mutex); | |
1049 | return found ? acpi_ec_get_query_handler(handler) : NULL; | |
1050 | } | |
1051 | ||
01305d41 LZ |
1052 | static void acpi_ec_query_handler_release(struct kref *kref) |
1053 | { | |
1054 | struct acpi_ec_query_handler *handler = | |
1055 | container_of(kref, struct acpi_ec_query_handler, kref); | |
1056 | ||
1057 | kfree(handler); | |
1058 | } | |
1059 | ||
1060 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
1061 | { | |
1062 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
1063 | } | |
1064 | ||
837012ed AS |
1065 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
1066 | acpi_handle handle, acpi_ec_query_func func, | |
1067 | void *data) | |
1068 | { | |
1069 | struct acpi_ec_query_handler *handler = | |
1070 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 1071 | |
837012ed AS |
1072 | if (!handler) |
1073 | return -ENOMEM; | |
1074 | ||
1075 | handler->query_bit = query_bit; | |
1076 | handler->handle = handle; | |
1077 | handler->func = func; | |
1078 | handler->data = data; | |
f351d027 | 1079 | mutex_lock(&ec->mutex); |
01305d41 | 1080 | kref_init(&handler->kref); |
30c08574 | 1081 | list_add(&handler->node, &ec->list); |
f351d027 | 1082 | mutex_unlock(&ec->mutex); |
837012ed AS |
1083 | return 0; |
1084 | } | |
837012ed AS |
1085 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
1086 | ||
0700c047 LZ |
1087 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
1088 | bool remove_all, u8 query_bit) | |
837012ed | 1089 | { |
1544fdbc | 1090 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 1091 | LIST_HEAD(free_list); |
7a73e60e | 1092 | |
f351d027 | 1093 | mutex_lock(&ec->mutex); |
1544fdbc | 1094 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
0700c047 | 1095 | if (remove_all || query_bit == handler->query_bit) { |
01305d41 LZ |
1096 | list_del_init(&handler->node); |
1097 | list_add(&handler->node, &free_list); | |
837012ed AS |
1098 | } |
1099 | } | |
f351d027 | 1100 | mutex_unlock(&ec->mutex); |
6b5eab54 | 1101 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 1102 | acpi_ec_put_query_handler(handler); |
837012ed | 1103 | } |
0700c047 LZ |
1104 | |
1105 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
1106 | { | |
1107 | acpi_ec_remove_query_handlers(ec, false, query_bit); | |
1108 | } | |
837012ed | 1109 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 1110 | |
02b771b6 | 1111 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
45bea155 | 1112 | { |
02b771b6 LZ |
1113 | struct acpi_ec_query *q; |
1114 | struct transaction *t; | |
1115 | ||
1116 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); | |
1117 | if (!q) | |
1118 | return NULL; | |
1119 | INIT_WORK(&q->work, acpi_ec_event_processor); | |
1120 | t = &q->transaction; | |
1121 | t->command = ACPI_EC_COMMAND_QUERY; | |
1122 | t->rdata = pval; | |
1123 | t->rlen = 1; | |
1124 | return q; | |
1125 | } | |
1126 | ||
1127 | static void acpi_ec_delete_query(struct acpi_ec_query *q) | |
1128 | { | |
1129 | if (q) { | |
1130 | if (q->handler) | |
1131 | acpi_ec_put_query_handler(q->handler); | |
1132 | kfree(q); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | static void acpi_ec_event_processor(struct work_struct *work) | |
1137 | { | |
1138 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); | |
1139 | struct acpi_ec_query_handler *handler = q->handler; | |
7a73e60e | 1140 | |
3535a3c1 | 1141 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
1142 | if (handler->func) |
1143 | handler->func(handler->data); | |
1144 | else if (handler->handle) | |
1145 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 1146 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
02b771b6 | 1147 | acpi_ec_delete_query(q); |
a62e8f19 AS |
1148 | } |
1149 | ||
550b3aac | 1150 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
1151 | { |
1152 | u8 value = 0; | |
c2cf5769 | 1153 | int result; |
02b771b6 LZ |
1154 | struct acpi_ec_query *q; |
1155 | ||
1156 | q = acpi_ec_create_query(&value); | |
1157 | if (!q) | |
1158 | return -ENOMEM; | |
3eba563e | 1159 | |
550b3aac LZ |
1160 | /* |
1161 | * Query the EC to find out which _Qxx method we need to evaluate. | |
1162 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
1163 | * bit to be cleared (and thus clearing the interrupt source). | |
1164 | */ | |
02b771b6 | 1165 | result = acpi_ec_transaction(ec, &q->transaction); |
550b3aac | 1166 | if (!value) |
02b771b6 LZ |
1167 | result = -ENODATA; |
1168 | if (result) | |
1169 | goto err_exit; | |
3eba563e | 1170 | |
0700c047 LZ |
1171 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
1172 | if (!q->handler) { | |
1173 | result = -ENODATA; | |
1174 | goto err_exit; | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * It is reported that _Qxx are evaluated in a parallel way on | |
1179 | * Windows: | |
1180 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 | |
1181 | * | |
1182 | * Put this log entry before schedule_work() in order to make | |
1183 | * it appearing before any other log entries occurred during the | |
1184 | * work queue execution. | |
1185 | */ | |
1186 | ec_dbg_evt("Query(0x%02x) scheduled", value); | |
e1191bd4 | 1187 | if (!queue_work(ec_query_wq, &q->work)) { |
0700c047 LZ |
1188 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
1189 | result = -EBUSY; | |
837012ed | 1190 | } |
02b771b6 LZ |
1191 | |
1192 | err_exit: | |
4981c2b7 | 1193 | if (result) |
02b771b6 LZ |
1194 | acpi_ec_delete_query(q); |
1195 | if (data) | |
1196 | *data = value; | |
c2cf5769 | 1197 | return result; |
a62e8f19 AS |
1198 | } |
1199 | ||
1d68d261 LZ |
1200 | static void acpi_ec_check_event(struct acpi_ec *ec) |
1201 | { | |
1202 | unsigned long flags; | |
1203 | ||
1204 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { | |
1205 | if (ec_guard(ec)) { | |
1206 | spin_lock_irqsave(&ec->lock, flags); | |
1207 | /* | |
1208 | * Take care of the SCI_EVT unless no one else is | |
1209 | * taking care of it. | |
1210 | */ | |
1211 | if (!ec->curr) | |
1212 | advance_transaction(ec); | |
1213 | spin_unlock_irqrestore(&ec->lock, flags); | |
1214 | } | |
1215 | } | |
1216 | } | |
1217 | ||
9d8993be | 1218 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 1219 | { |
9d8993be | 1220 | unsigned long flags; |
74443bbe | 1221 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 1222 | |
9d8993be LZ |
1223 | ec_dbg_evt("Event started"); |
1224 | ||
1225 | spin_lock_irqsave(&ec->lock, flags); | |
1226 | while (ec->nr_pending_queries) { | |
1227 | spin_unlock_irqrestore(&ec->lock, flags); | |
1228 | (void)acpi_ec_query(ec, NULL); | |
1229 | spin_lock_irqsave(&ec->lock, flags); | |
1230 | ec->nr_pending_queries--; | |
66db3834 LZ |
1231 | /* |
1232 | * Before exit, make sure that this work item can be | |
1233 | * scheduled again. There might be QR_EC failures, leaving | |
1234 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work | |
1235 | * item from being scheduled again. | |
1236 | */ | |
1237 | if (!ec->nr_pending_queries) { | |
1238 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || | |
1239 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) | |
1240 | acpi_ec_complete_query(ec); | |
1241 | } | |
9d8993be LZ |
1242 | } |
1243 | spin_unlock_irqrestore(&ec->lock, flags); | |
1244 | ||
1245 | ec_dbg_evt("Event stopped"); | |
1d68d261 LZ |
1246 | |
1247 | acpi_ec_check_event(ec); | |
45bea155 | 1248 | } |
1da177e4 | 1249 | |
8b6cd8ad LM |
1250 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
1251 | u32 gpe_number, void *data) | |
1da177e4 | 1252 | { |
f92fca00 | 1253 | unsigned long flags; |
3d02b90b | 1254 | struct acpi_ec *ec = data; |
7c6db4e0 | 1255 | |
f92fca00 | 1256 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 1257 | advance_transaction(ec); |
c0d65341 | 1258 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 1259 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
1260 | } |
1261 | ||
1da177e4 | 1262 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1263 | * Address Space Management |
1264 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1265 | |
1da177e4 | 1266 | static acpi_status |
5b7734b4 | 1267 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1268 | u32 bits, u64 *value64, |
50526df6 | 1269 | void *handler_context, void *region_context) |
1da177e4 | 1270 | { |
3d02b90b | 1271 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1272 | int result = 0, i, bytes = bits / 8; |
1273 | u8 *value = (u8 *)value64; | |
1da177e4 | 1274 | |
1da177e4 | 1275 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1276 | return AE_BAD_PARAMETER; |
1da177e4 | 1277 | |
5b7734b4 | 1278 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1279 | return AE_BAD_PARAMETER; |
1da177e4 | 1280 | |
15de603b | 1281 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1282 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1283 | |
dadf28a1 AS |
1284 | for (i = 0; i < bytes; ++i, ++address, ++value) |
1285 | result = (function == ACPI_READ) ? | |
1286 | acpi_ec_read(ec, address, value) : | |
1287 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1288 | |
15de603b | 1289 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1290 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1291 | |
1da177e4 LT |
1292 | switch (result) { |
1293 | case -EINVAL: | |
d550d98d | 1294 | return AE_BAD_PARAMETER; |
1da177e4 | 1295 | case -ENODEV: |
d550d98d | 1296 | return AE_NOT_FOUND; |
1da177e4 | 1297 | case -ETIME: |
d550d98d | 1298 | return AE_TIME; |
1da177e4 | 1299 | default: |
d550d98d | 1300 | return AE_OK; |
1da177e4 | 1301 | } |
1da177e4 LT |
1302 | } |
1303 | ||
1da177e4 | 1304 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1305 | * Driver Interface |
1306 | * -------------------------------------------------------------------------- */ | |
1307 | ||
c0900c35 AS |
1308 | static acpi_status |
1309 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1310 | ||
72c77b7e LZ |
1311 | static void acpi_ec_free(struct acpi_ec *ec) |
1312 | { | |
1313 | if (first_ec == ec) | |
1314 | first_ec = NULL; | |
1315 | if (boot_ec == ec) | |
1316 | boot_ec = NULL; | |
1317 | kfree(ec); | |
1318 | } | |
1319 | ||
1320 | static struct acpi_ec *acpi_ec_alloc(void) | |
c0900c35 AS |
1321 | { |
1322 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1323 | |
c0900c35 AS |
1324 | if (!ec) |
1325 | return NULL; | |
f351d027 | 1326 | mutex_init(&ec->mutex); |
c0900c35 | 1327 | init_waitqueue_head(&ec->wait); |
837012ed | 1328 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1329 | spin_lock_init(&ec->lock); |
9d8993be | 1330 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1331 | ec->timestamp = jiffies; |
c0900c35 AS |
1332 | return ec; |
1333 | } | |
837012ed | 1334 | |
c019b193 AS |
1335 | static acpi_status |
1336 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1337 | void *context, void **return_value) | |
1338 | { | |
0175d562 LM |
1339 | char node_name[5]; |
1340 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1341 | struct acpi_ec *ec = context; |
1342 | int value = 0; | |
0175d562 LM |
1343 | acpi_status status; |
1344 | ||
1345 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1346 | ||
7a73e60e | 1347 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1348 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1349 | return AE_OK; |
1350 | } | |
1351 | ||
cd8c93a4 AS |
1352 | static acpi_status |
1353 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1354 | { |
cd8c93a4 | 1355 | acpi_status status; |
d21cf3c1 | 1356 | unsigned long long tmp = 0; |
cd8c93a4 | 1357 | struct acpi_ec *ec = context; |
a5032bfd AS |
1358 | |
1359 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1360 | ec->command_addr = ec->data_addr = 0; | |
1361 | ||
cd8c93a4 AS |
1362 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1363 | ec_parse_io_ports, ec); | |
1364 | if (ACPI_FAILURE(status)) | |
1365 | return status; | |
837012ed AS |
1366 | |
1367 | /* Get GPE bit assignment (EC events). */ | |
1368 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1369 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1370 | if (ACPI_FAILURE(status)) |
1371 | return status; | |
27663c58 | 1372 | ec->gpe = tmp; |
837012ed | 1373 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1374 | tmp = 0; |
27663c58 MW |
1375 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1376 | ec->global_lock = tmp; | |
837012ed | 1377 | ec->handle = handle; |
cd8c93a4 | 1378 | return AE_CTRL_TERMINATE; |
837012ed AS |
1379 | } |
1380 | ||
72c77b7e LZ |
1381 | /* |
1382 | * Note: This function returns an error code only when the address space | |
1383 | * handler is not installed, which means "not able to handle | |
1384 | * transactions". | |
1385 | */ | |
2a570840 | 1386 | static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) |
5efc5476 BH |
1387 | { |
1388 | acpi_status status; | |
7a73e60e | 1389 | |
ad479e7f | 1390 | acpi_ec_start(ec, false); |
0e1affe4 LZ |
1391 | |
1392 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { | |
1393 | status = acpi_install_address_space_handler(ec->handle, | |
1394 | ACPI_ADR_SPACE_EC, | |
1395 | &acpi_ec_space_handler, | |
1396 | NULL, ec); | |
1397 | if (ACPI_FAILURE(status)) { | |
1398 | if (status == AE_NOT_FOUND) { | |
1399 | /* | |
1400 | * Maybe OS fails in evaluating the _REG | |
1401 | * object. The AE_NOT_FOUND error will be | |
1402 | * ignored and OS * continue to initialize | |
1403 | * EC. | |
1404 | */ | |
1405 | pr_err("Fail in evaluating the _REG object" | |
1406 | " of EC device. Broken bios is suspected.\n"); | |
1407 | } else { | |
1408 | acpi_ec_stop(ec, false); | |
1409 | return -ENODEV; | |
1410 | } | |
1411 | } | |
1412 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1413 | } | |
1414 | ||
2a570840 LZ |
1415 | if (!handle_events) |
1416 | return 0; | |
1417 | ||
1418 | if (!test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { | |
1419 | /* Find and register all query methods */ | |
1420 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
1421 | acpi_ec_register_query_methods, | |
1422 | NULL, ec, NULL); | |
1423 | set_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); | |
1424 | } | |
0e1affe4 LZ |
1425 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1426 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, | |
1427 | ACPI_GPE_EDGE_TRIGGERED, | |
1428 | &acpi_ec_gpe_handler, ec); | |
1429 | /* This is not fatal as we can poll EC events */ | |
1430 | if (ACPI_SUCCESS(status)) { | |
1431 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1432 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
1433 | ec->reference_count >= 1) | |
1434 | acpi_ec_enable_gpe(ec, true); | |
2a570840 LZ |
1435 | |
1436 | /* EC is fully operational, allow queries */ | |
1437 | acpi_ec_enable_event(ec); | |
5efc5476 BH |
1438 | } |
1439 | } | |
1440 | ||
5efc5476 BH |
1441 | return 0; |
1442 | } | |
1443 | ||
4c611060 AS |
1444 | static void ec_remove_handlers(struct acpi_ec *ec) |
1445 | { | |
0e1affe4 LZ |
1446 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
1447 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
1448 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
1449 | pr_err("failed to remove space handler\n"); | |
1450 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1451 | } | |
1452 | ||
fa5b4a50 LZ |
1453 | /* |
1454 | * Stops handling the EC transactions after removing the operation | |
1455 | * region handler. This is required because _REG(DISCONNECT) | |
1456 | * invoked during the removal can result in new EC transactions. | |
1457 | * | |
1458 | * Flushes the EC requests and thus disables the GPE before | |
1459 | * removing the GPE handler. This is required by the current ACPICA | |
1460 | * GPE core. ACPICA GPE core will automatically disable a GPE when | |
1461 | * it is indicated but there is no way to handle it. So the drivers | |
1462 | * must disable the GPEs prior to removing the GPE handlers. | |
1463 | */ | |
1464 | acpi_ec_stop(ec, false); | |
1465 | ||
0e1affe4 LZ |
1466 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1467 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
1468 | &acpi_ec_gpe_handler))) | |
1469 | pr_err("failed to remove gpe handler\n"); | |
1470 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1471 | } | |
2a570840 LZ |
1472 | if (test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
1473 | acpi_ec_remove_query_handlers(ec, true, 0); | |
1474 | clear_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); | |
1475 | } | |
4c611060 AS |
1476 | } |
1477 | ||
2a570840 | 1478 | static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events) |
1da177e4 | 1479 | { |
72c77b7e | 1480 | int ret; |
c0900c35 | 1481 | |
2a570840 | 1482 | ret = ec_install_handlers(ec, handle_events); |
72c77b7e LZ |
1483 | if (ret) |
1484 | return ret; | |
1485 | ||
1486 | /* First EC capable of handling transactions */ | |
1487 | if (!first_ec) { | |
1488 | first_ec = ec; | |
1489 | acpi_handle_info(first_ec->handle, "Used as first EC\n"); | |
a5032bfd | 1490 | } |
72c77b7e LZ |
1491 | |
1492 | acpi_handle_info(ec->handle, | |
1493 | "GPE=0x%lx, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", | |
1494 | ec->gpe, ec->command_addr, ec->data_addr); | |
1495 | return ret; | |
1496 | } | |
1497 | ||
2a570840 LZ |
1498 | static int acpi_config_boot_ec(struct acpi_ec *ec, acpi_handle handle, |
1499 | bool handle_events, bool is_ecdt) | |
72c77b7e LZ |
1500 | { |
1501 | int ret; | |
1502 | ||
2a570840 LZ |
1503 | /* |
1504 | * Changing the ACPI handle results in a re-configuration of the | |
1505 | * boot EC. And if it happens after the namespace initialization, | |
1506 | * it causes _REG evaluations. | |
1507 | */ | |
1508 | if (boot_ec && boot_ec->handle != handle) | |
72c77b7e LZ |
1509 | ec_remove_handlers(boot_ec); |
1510 | ||
1511 | /* Unset old boot EC */ | |
1512 | if (boot_ec != ec) | |
1513 | acpi_ec_free(boot_ec); | |
1514 | ||
2a570840 LZ |
1515 | /* |
1516 | * ECDT device creation is split into acpi_ec_ecdt_probe() and | |
1517 | * acpi_ec_ecdt_start(). This function takes care of completing the | |
1518 | * ECDT parsing logic as the handle update should be performed | |
1519 | * between the installation/uninstallation of the handlers. | |
1520 | */ | |
1521 | if (ec->handle != handle) | |
1522 | ec->handle = handle; | |
1523 | ||
1524 | ret = acpi_ec_setup(ec, handle_events); | |
72c77b7e LZ |
1525 | if (ret) |
1526 | return ret; | |
1527 | ||
1528 | /* Set new boot EC */ | |
1529 | if (!boot_ec) { | |
1530 | boot_ec = ec; | |
1531 | boot_ec_is_ecdt = is_ecdt; | |
72c77b7e | 1532 | } |
2a570840 LZ |
1533 | |
1534 | acpi_handle_info(boot_ec->handle, | |
1535 | "Used as boot %s EC to handle transactions%s\n", | |
1536 | is_ecdt ? "ECDT" : "DSDT", | |
1537 | handle_events ? " and events" : ""); | |
72c77b7e | 1538 | return ret; |
fd6231e7 LZ |
1539 | } |
1540 | ||
97cb159f LZ |
1541 | static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle) |
1542 | { | |
1543 | struct acpi_table_ecdt *ecdt_ptr; | |
1544 | acpi_status status; | |
1545 | acpi_handle handle; | |
1546 | ||
1547 | status = acpi_get_table(ACPI_SIG_ECDT, 1, | |
1548 | (struct acpi_table_header **)&ecdt_ptr); | |
1549 | if (ACPI_FAILURE(status)) | |
1550 | return false; | |
1551 | ||
1552 | status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); | |
1553 | if (ACPI_FAILURE(status)) | |
1554 | return false; | |
1555 | ||
1556 | *phandle = handle; | |
1557 | return true; | |
1558 | } | |
1559 | ||
1560 | static bool acpi_is_boot_ec(struct acpi_ec *ec) | |
1561 | { | |
1562 | if (!boot_ec) | |
1563 | return false; | |
1564 | if (ec->handle == boot_ec->handle && | |
1565 | ec->gpe == boot_ec->gpe && | |
1566 | ec->command_addr == boot_ec->command_addr && | |
1567 | ec->data_addr == boot_ec->data_addr) | |
1568 | return true; | |
1569 | return false; | |
1570 | } | |
1571 | ||
fd6231e7 LZ |
1572 | static int acpi_ec_add(struct acpi_device *device) |
1573 | { | |
1574 | struct acpi_ec *ec = NULL; | |
1575 | int ret; | |
1576 | ||
1577 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1578 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1579 | ||
1580 | ec = acpi_ec_alloc(); | |
1581 | if (!ec) | |
1582 | return -ENOMEM; | |
a5032bfd AS |
1583 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
1584 | AE_CTRL_TERMINATE) { | |
46922d2a LZ |
1585 | ret = -EINVAL; |
1586 | goto err_alloc; | |
4c611060 AS |
1587 | } |
1588 | ||
97cb159f LZ |
1589 | if (acpi_is_boot_ec(ec)) { |
1590 | boot_ec_is_ecdt = false; | |
1591 | acpi_handle_debug(ec->handle, "duplicated.\n"); | |
1592 | acpi_ec_free(ec); | |
1593 | ec = boot_ec; | |
1594 | ret = acpi_config_boot_ec(ec, ec->handle, true, false); | |
1595 | } else | |
1596 | ret = acpi_ec_setup(ec, true); | |
46922d2a LZ |
1597 | if (ret) |
1598 | goto err_query; | |
1599 | ||
db89b4f0 | 1600 | device->driver_data = ec; |
de4f1046 | 1601 | |
d6795fe3 AK |
1602 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1603 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1604 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1605 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1606 | |
1c832b3e LT |
1607 | /* Reprobe devices depending on the EC */ |
1608 | acpi_walk_dep_device_list(ec->handle); | |
97cb159f | 1609 | acpi_handle_debug(ec->handle, "enumerated.\n"); |
46922d2a LZ |
1610 | return 0; |
1611 | ||
1612 | err_query: | |
97cb159f LZ |
1613 | if (ec != boot_ec) |
1614 | acpi_ec_remove_query_handlers(ec, true, 0); | |
46922d2a | 1615 | err_alloc: |
97cb159f LZ |
1616 | if (ec != boot_ec) |
1617 | acpi_ec_free(ec); | |
5efc5476 | 1618 | return ret; |
1da177e4 LT |
1619 | } |
1620 | ||
51fac838 | 1621 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1622 | { |
01f22462 | 1623 | struct acpi_ec *ec; |
1da177e4 | 1624 | |
1da177e4 | 1625 | if (!device) |
d550d98d | 1626 | return -EINVAL; |
1da177e4 LT |
1627 | |
1628 | ec = acpi_driver_data(device); | |
de4f1046 TR |
1629 | release_region(ec->data_addr, 1); |
1630 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1631 | device->driver_data = NULL; |
97cb159f LZ |
1632 | if (ec != boot_ec) { |
1633 | ec_remove_handlers(ec); | |
1634 | acpi_ec_free(ec); | |
1635 | } | |
d550d98d | 1636 | return 0; |
1da177e4 LT |
1637 | } |
1638 | ||
1da177e4 | 1639 | static acpi_status |
c0900c35 | 1640 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1641 | { |
3d02b90b | 1642 | struct acpi_ec *ec = context; |
1da177e4 | 1643 | |
01f22462 | 1644 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1645 | return AE_OK; |
1da177e4 LT |
1646 | |
1647 | /* | |
1648 | * The first address region returned is the data port, and | |
1649 | * the second address region returned is the status/command | |
1650 | * port. | |
1651 | */ | |
de4f1046 | 1652 | if (ec->data_addr == 0) |
6ffb221a | 1653 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1654 | else if (ec->command_addr == 0) |
6ffb221a | 1655 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1656 | else |
1da177e4 | 1657 | return AE_CTRL_TERMINATE; |
1da177e4 | 1658 | |
1da177e4 LT |
1659 | return AE_OK; |
1660 | } | |
1661 | ||
dcf15cbd LZ |
1662 | static const struct acpi_device_id ec_device_ids[] = { |
1663 | {"PNP0C09", 0}, | |
1664 | {"", 0}, | |
1665 | }; | |
1666 | ||
1667 | int __init acpi_ec_dsdt_probe(void) | |
c04209a7 | 1668 | { |
dcf15cbd | 1669 | acpi_status status; |
fd6231e7 LZ |
1670 | struct acpi_ec *ec; |
1671 | int ret; | |
dcf15cbd | 1672 | |
fd6231e7 LZ |
1673 | ec = acpi_ec_alloc(); |
1674 | if (!ec) | |
1675 | return -ENOMEM; | |
dcf15cbd | 1676 | /* |
2a570840 LZ |
1677 | * At this point, the namespace is initialized, so start to find |
1678 | * the namespace objects. | |
dcf15cbd | 1679 | */ |
dcf15cbd | 1680 | status = acpi_get_devices(ec_device_ids[0].id, |
fd6231e7 LZ |
1681 | ec_parse_device, ec, NULL); |
1682 | if (ACPI_FAILURE(status) || !ec->handle) { | |
1683 | ret = -ENODEV; | |
1684 | goto error; | |
c04209a7 | 1685 | } |
2a570840 LZ |
1686 | /* |
1687 | * When the DSDT EC is available, always re-configure boot EC to | |
1688 | * have _REG evaluated. _REG can only be evaluated after the | |
1689 | * namespace initialization. | |
1690 | * At this point, the GPE is not fully initialized, so do not to | |
1691 | * handle the events. | |
1692 | */ | |
1693 | ret = acpi_config_boot_ec(ec, ec->handle, false, false); | |
fd6231e7 LZ |
1694 | error: |
1695 | if (ret) | |
72c77b7e | 1696 | acpi_ec_free(ec); |
fd6231e7 | 1697 | return ret; |
c04209a7 AS |
1698 | } |
1699 | ||
2a570840 LZ |
1700 | /* |
1701 | * If the DSDT EC is not functioning, we still need to prepare a fully | |
1702 | * functioning ECDT EC first in order to handle the events. | |
1703 | * https://bugzilla.kernel.org/show_bug.cgi?id=115021 | |
1704 | */ | |
1705 | int __init acpi_ec_ecdt_start(void) | |
1706 | { | |
2a570840 LZ |
1707 | acpi_handle handle; |
1708 | ||
1709 | if (!boot_ec) | |
1710 | return -ENODEV; | |
1711 | /* | |
1712 | * The DSDT EC should have already been started in | |
1713 | * acpi_ec_add(). | |
1714 | */ | |
1715 | if (!boot_ec_is_ecdt) | |
1716 | return -ENODEV; | |
1717 | ||
2a570840 LZ |
1718 | /* |
1719 | * At this point, the namespace and the GPE is initialized, so | |
1720 | * start to find the namespace objects and handle the events. | |
1721 | */ | |
97cb159f | 1722 | if (!acpi_ec_ecdt_get_handle(&handle)) |
2a570840 LZ |
1723 | return -ENODEV; |
1724 | return acpi_config_boot_ec(boot_ec, handle, true, true); | |
1725 | } | |
1726 | ||
3cb02aeb | 1727 | #if 0 |
79149001 | 1728 | /* |
3cb02aeb LZ |
1729 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
1730 | * set, for which case, we complete the QR_EC without issuing it to the | |
1731 | * firmware. | |
1732 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 | |
1733 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 | |
79149001 LZ |
1734 | */ |
1735 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1736 | { | |
1737 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1738 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1739 | return 0; | |
1740 | } | |
3cb02aeb | 1741 | #endif |
79149001 | 1742 | |
ad332c8a KC |
1743 | /* |
1744 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1745 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1746 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1747 | * | |
1748 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1749 | * | |
1750 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1751 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1752 | * behaviour is not known at this time. | |
1753 | * | |
1754 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1755 | * however it is very likely that other Samsung models are affected. | |
1756 | * | |
1757 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1758 | * should be harmless. | |
1759 | */ | |
1760 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1761 | { | |
1762 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1763 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
3cb02aeb | 1764 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
ad332c8a KC |
1765 | return 0; |
1766 | } | |
1767 | ||
bc539567 LZ |
1768 | /* |
1769 | * Some ECDTs contain wrong register addresses. | |
1770 | * MSI MS-171F | |
1771 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1772 | */ | |
59f0aa94 LZ |
1773 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
1774 | { | |
1775 | pr_debug("Detected system needing ECDT address correction.\n"); | |
1776 | EC_FLAGS_CORRECT_ECDT = 1; | |
1777 | return 0; | |
1778 | } | |
1779 | ||
6cef7497 | 1780 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
0adf3c74 | 1781 | { |
59f0aa94 | 1782 | ec_correct_ecdt, "MSI MS-171F", { |
3174abcf LZ |
1783 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
1784 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, | |
777cb382 | 1785 | { |
ad332c8a KC |
1786 | ec_clear_on_resume, "Samsung hardware", { |
1787 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1788 | {}, |
1789 | }; | |
1790 | ||
c0900c35 AS |
1791 | int __init acpi_ec_ecdt_probe(void) |
1792 | { | |
fd6231e7 | 1793 | int ret; |
c0900c35 | 1794 | acpi_status status; |
50526df6 | 1795 | struct acpi_table_ecdt *ecdt_ptr; |
fd6231e7 | 1796 | struct acpi_ec *ec; |
45bea155 | 1797 | |
fd6231e7 LZ |
1798 | ec = acpi_ec_alloc(); |
1799 | if (!ec) | |
c0900c35 AS |
1800 | return -ENOMEM; |
1801 | /* | |
1802 | * Generate a boot ec context | |
1803 | */ | |
0adf3c74 | 1804 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1805 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1806 | (struct acpi_table_header **)&ecdt_ptr); | |
59f0aa94 LZ |
1807 | if (ACPI_FAILURE(status)) { |
1808 | ret = -ENODEV; | |
1809 | goto error; | |
cd8c93a4 | 1810 | } |
0adf3c74 | 1811 | |
59f0aa94 LZ |
1812 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
1813 | /* | |
1814 | * Asus X50GL: | |
1815 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 | |
1816 | */ | |
1817 | ret = -ENODEV; | |
1818 | goto error; | |
ed4b197d | 1819 | } |
478fa03b | 1820 | |
59f0aa94 | 1821 | if (EC_FLAGS_CORRECT_ECDT) { |
fd6231e7 LZ |
1822 | ec->command_addr = ecdt_ptr->data.address; |
1823 | ec->data_addr = ecdt_ptr->control.address; | |
c6cb0e87 | 1824 | } else { |
fd6231e7 LZ |
1825 | ec->command_addr = ecdt_ptr->control.address; |
1826 | ec->data_addr = ecdt_ptr->data.address; | |
c6cb0e87 | 1827 | } |
fd6231e7 | 1828 | ec->gpe = ecdt_ptr->gpe; |
2a570840 LZ |
1829 | |
1830 | /* | |
1831 | * At this point, the namespace is not initialized, so do not find | |
1832 | * the namespace objects, or handle the events. | |
1833 | */ | |
1834 | ret = acpi_config_boot_ec(ec, ACPI_ROOT_OBJECT, false, true); | |
c5279dee | 1835 | error: |
fd6231e7 | 1836 | if (ret) |
72c77b7e | 1837 | acpi_ec_free(ec); |
59f0aa94 | 1838 | return ret; |
1da177e4 LT |
1839 | } |
1840 | ||
df45db61 LZ |
1841 | #ifdef CONFIG_PM_SLEEP |
1842 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) | |
1843 | { | |
1844 | unsigned long flags; | |
1845 | ||
1846 | if (ec == first_ec) { | |
1847 | spin_lock_irqsave(&ec->lock, flags); | |
1848 | ec->saved_busy_polling = ec_busy_polling; | |
1849 | ec->saved_polling_guard = ec_polling_guard; | |
1850 | ec_busy_polling = true; | |
1851 | ec_polling_guard = 0; | |
1852 | ec_log_drv("interrupt blocked"); | |
1853 | spin_unlock_irqrestore(&ec->lock, flags); | |
1854 | } | |
1855 | } | |
1856 | ||
1857 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) | |
1858 | { | |
1859 | unsigned long flags; | |
1860 | ||
1861 | if (ec == first_ec) { | |
1862 | spin_lock_irqsave(&ec->lock, flags); | |
1863 | ec_busy_polling = ec->saved_busy_polling; | |
1864 | ec_polling_guard = ec->saved_polling_guard; | |
1865 | ec_log_drv("interrupt unblocked"); | |
1866 | spin_unlock_irqrestore(&ec->lock, flags); | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | static int acpi_ec_suspend_noirq(struct device *dev) | |
1871 | { | |
1872 | struct acpi_ec *ec = | |
1873 | acpi_driver_data(to_acpi_device(dev)); | |
1874 | ||
1875 | acpi_ec_enter_noirq(ec); | |
1876 | return 0; | |
1877 | } | |
1878 | ||
1879 | static int acpi_ec_resume_noirq(struct device *dev) | |
1880 | { | |
1881 | struct acpi_ec *ec = | |
1882 | acpi_driver_data(to_acpi_device(dev)); | |
1883 | ||
1884 | acpi_ec_leave_noirq(ec); | |
1885 | return 0; | |
1886 | } | |
c2b46d67 | 1887 | |
39a2a2aa LZ |
1888 | static int acpi_ec_suspend(struct device *dev) |
1889 | { | |
1890 | struct acpi_ec *ec = | |
1891 | acpi_driver_data(to_acpi_device(dev)); | |
1892 | ||
1893 | if (ec_freeze_events) | |
1894 | acpi_ec_disable_event(ec); | |
1895 | return 0; | |
1896 | } | |
1897 | ||
c2b46d67 LZ |
1898 | static int acpi_ec_resume(struct device *dev) |
1899 | { | |
1900 | struct acpi_ec *ec = | |
1901 | acpi_driver_data(to_acpi_device(dev)); | |
1902 | ||
1903 | acpi_ec_enable_event(ec); | |
1904 | return 0; | |
1905 | } | |
df45db61 LZ |
1906 | #endif |
1907 | ||
1908 | static const struct dev_pm_ops acpi_ec_pm = { | |
1909 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) | |
39a2a2aa | 1910 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
df45db61 LZ |
1911 | }; |
1912 | ||
1d68d261 LZ |
1913 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
1914 | { | |
1915 | int result = 0; | |
1916 | ||
1917 | if (!strncmp(val, "status", sizeof("status") - 1)) { | |
1918 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
1919 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); | |
1920 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { | |
1921 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; | |
1922 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); | |
1923 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { | |
1924 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; | |
1925 | pr_info("Assuming SCI_EVT clearing on event reads\n"); | |
1926 | } else | |
1927 | result = -EINVAL; | |
1928 | return result; | |
1929 | } | |
1930 | ||
1931 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) | |
1932 | { | |
1933 | switch (ec_event_clearing) { | |
1934 | case ACPI_EC_EVT_TIMING_STATUS: | |
1935 | return sprintf(buffer, "status"); | |
1936 | case ACPI_EC_EVT_TIMING_QUERY: | |
1937 | return sprintf(buffer, "query"); | |
1938 | case ACPI_EC_EVT_TIMING_EVENT: | |
1939 | return sprintf(buffer, "event"); | |
1940 | default: | |
1941 | return sprintf(buffer, "invalid"); | |
1942 | } | |
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, | |
1947 | NULL, 0644); | |
1948 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); | |
1949 | ||
223883b7 AS |
1950 | static struct acpi_driver acpi_ec_driver = { |
1951 | .name = "ec", | |
1952 | .class = ACPI_EC_CLASS, | |
1953 | .ids = ec_device_ids, | |
1954 | .ops = { | |
1955 | .add = acpi_ec_add, | |
1956 | .remove = acpi_ec_remove, | |
223883b7 | 1957 | }, |
df45db61 | 1958 | .drv.pm = &acpi_ec_pm, |
223883b7 AS |
1959 | }; |
1960 | ||
e1191bd4 LZ |
1961 | static inline int acpi_ec_query_init(void) |
1962 | { | |
1963 | if (!ec_query_wq) { | |
1964 | ec_query_wq = alloc_workqueue("kec_query", 0, | |
1965 | ec_max_queries); | |
1966 | if (!ec_query_wq) | |
1967 | return -ENODEV; | |
1968 | } | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | static inline void acpi_ec_query_exit(void) | |
1973 | { | |
1974 | if (ec_query_wq) { | |
1975 | destroy_workqueue(ec_query_wq); | |
1976 | ec_query_wq = NULL; | |
1977 | } | |
1978 | } | |
1979 | ||
a5f820fe | 1980 | int __init acpi_ec_init(void) |
1da177e4 | 1981 | { |
e1191bd4 | 1982 | int result; |
1da177e4 | 1983 | |
e1191bd4 LZ |
1984 | /* register workqueue for _Qxx evaluations */ |
1985 | result = acpi_ec_query_init(); | |
1986 | if (result) | |
1987 | goto err_exit; | |
1da177e4 LT |
1988 | /* Now register the driver for the EC */ |
1989 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
e1191bd4 LZ |
1990 | if (result) |
1991 | goto err_exit; | |
1da177e4 | 1992 | |
e1191bd4 LZ |
1993 | err_exit: |
1994 | if (result) | |
1995 | acpi_ec_query_exit(); | |
d550d98d | 1996 | return result; |
1da177e4 LT |
1997 | } |
1998 | ||
1da177e4 LT |
1999 | /* EC driver currently not unloadable */ |
2000 | #if 0 | |
50526df6 | 2001 | static void __exit acpi_ec_exit(void) |
1da177e4 | 2002 | { |
1da177e4 LT |
2003 | |
2004 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
e1191bd4 | 2005 | acpi_ec_query_exit(); |
1da177e4 | 2006 | } |
7843932a | 2007 | #endif /* 0 */ |