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Commit | Line | Data |
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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 */ |
b6aeab44 | 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 | ||
9c40f956 | 150 | static bool ec_freeze_events __read_mostly = false; |
39a2a2aa LZ |
151 | module_param(ec_freeze_events, bool, 0644); |
152 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); | |
153 | ||
76380636 RW |
154 | static bool ec_no_wakeup __read_mostly; |
155 | module_param(ec_no_wakeup, bool, 0644); | |
156 | MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to-idle"); | |
157 | ||
837012ed AS |
158 | struct acpi_ec_query_handler { |
159 | struct list_head node; | |
160 | acpi_ec_query_func func; | |
161 | acpi_handle handle; | |
162 | void *data; | |
163 | u8 query_bit; | |
01305d41 | 164 | struct kref kref; |
837012ed AS |
165 | }; |
166 | ||
8463200a | 167 | struct transaction { |
7c6db4e0 AS |
168 | const u8 *wdata; |
169 | u8 *rdata; | |
170 | unsigned short irq_count; | |
8463200a | 171 | u8 command; |
a2f93aea AS |
172 | u8 wi; |
173 | u8 ri; | |
7c6db4e0 AS |
174 | u8 wlen; |
175 | u8 rlen; | |
f92fca00 | 176 | u8 flags; |
7c6db4e0 AS |
177 | }; |
178 | ||
02b771b6 LZ |
179 | struct acpi_ec_query { |
180 | struct transaction transaction; | |
181 | struct work_struct work; | |
182 | struct acpi_ec_query_handler *handler; | |
183 | }; | |
184 | ||
550b3aac | 185 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 186 | static void advance_transaction(struct acpi_ec *ec); |
02b771b6 LZ |
187 | static void acpi_ec_event_handler(struct work_struct *work); |
188 | static void acpi_ec_event_processor(struct work_struct *work); | |
74443bbe | 189 | |
1195a098 TR |
190 | struct acpi_ec *boot_ec, *first_ec; |
191 | EXPORT_SYMBOL(first_ec); | |
72c77b7e | 192 | static bool boot_ec_is_ecdt = false; |
e1191bd4 | 193 | static struct workqueue_struct *ec_query_wq; |
703959d4 | 194 | |
79149001 | 195 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
59f0aa94 | 196 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
440f53da | 197 | static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */ |
5423a0cb | 198 | |
3535a3c1 LZ |
199 | /* -------------------------------------------------------------------------- |
200 | * Logging/Debugging | |
201 | * -------------------------------------------------------------------------- */ | |
202 | ||
203 | /* | |
204 | * Splitters used by the developers to track the boundary of the EC | |
205 | * handling processes. | |
206 | */ | |
207 | #ifdef DEBUG | |
208 | #define EC_DBG_SEP " " | |
209 | #define EC_DBG_DRV "+++++" | |
210 | #define EC_DBG_STM "=====" | |
211 | #define EC_DBG_REQ "*****" | |
212 | #define EC_DBG_EVT "#####" | |
213 | #else | |
214 | #define EC_DBG_SEP "" | |
215 | #define EC_DBG_DRV | |
216 | #define EC_DBG_STM | |
217 | #define EC_DBG_REQ | |
218 | #define EC_DBG_EVT | |
219 | #endif | |
220 | ||
221 | #define ec_log_raw(fmt, ...) \ | |
222 | pr_info(fmt "\n", ##__VA_ARGS__) | |
223 | #define ec_dbg_raw(fmt, ...) \ | |
224 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
225 | #define ec_log(filter, fmt, ...) \ | |
226 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
227 | #define ec_dbg(filter, fmt, ...) \ | |
228 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
229 | ||
230 | #define ec_log_drv(fmt, ...) \ | |
231 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
232 | #define ec_dbg_drv(fmt, ...) \ | |
233 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
234 | #define ec_dbg_stm(fmt, ...) \ | |
235 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
236 | #define ec_dbg_req(fmt, ...) \ | |
237 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
238 | #define ec_dbg_evt(fmt, ...) \ | |
239 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
240 | #define ec_dbg_ref(ec, fmt, ...) \ |
241 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 242 | |
ad479e7f LZ |
243 | /* -------------------------------------------------------------------------- |
244 | * Device Flags | |
245 | * -------------------------------------------------------------------------- */ | |
246 | ||
247 | static bool acpi_ec_started(struct acpi_ec *ec) | |
248 | { | |
249 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
250 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
251 | } | |
252 | ||
750f628b LZ |
253 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
254 | { | |
255 | /* | |
256 | * There is an OSPM early stage logic. During the early stages | |
257 | * (boot/resume), OSPMs shouldn't enable the event handling, only | |
258 | * the EC transactions are allowed to be performed. | |
259 | */ | |
260 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
261 | return false; | |
262 | /* | |
39a2a2aa LZ |
263 | * However, disabling the event handling is experimental for late |
264 | * stage (suspend), and is controlled by the boot parameter of | |
265 | * "ec_freeze_events": | |
266 | * 1. true: The EC event handling is disabled before entering | |
267 | * the noirq stage. | |
268 | * 2. false: The EC event handling is automatically disabled as | |
269 | * soon as the EC driver is stopped. | |
750f628b | 270 | */ |
39a2a2aa LZ |
271 | if (ec_freeze_events) |
272 | return acpi_ec_started(ec); | |
273 | else | |
274 | return test_bit(EC_FLAGS_STARTED, &ec->flags); | |
750f628b LZ |
275 | } |
276 | ||
9887d22a LZ |
277 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
278 | { | |
279 | return ec->reference_count == 1; | |
280 | } | |
281 | ||
1da177e4 | 282 | /* -------------------------------------------------------------------------- |
ca37bfdf | 283 | * EC Registers |
7a73e60e | 284 | * -------------------------------------------------------------------------- */ |
1da177e4 | 285 | |
6ffb221a | 286 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 287 | { |
3ebe08a7 | 288 | u8 x = inb(ec->command_addr); |
7a73e60e | 289 | |
3535a3c1 LZ |
290 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
291 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
292 | x, | |
293 | !!(x & ACPI_EC_FLAG_SCI), | |
294 | !!(x & ACPI_EC_FLAG_BURST), | |
295 | !!(x & ACPI_EC_FLAG_CMD), | |
296 | !!(x & ACPI_EC_FLAG_IBF), | |
297 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 298 | return x; |
451566f4 DT |
299 | } |
300 | ||
6ffb221a | 301 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 302 | { |
3ebe08a7 | 303 | u8 x = inb(ec->data_addr); |
7a73e60e | 304 | |
d8d031a6 | 305 | ec->timestamp = jiffies; |
3535a3c1 | 306 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 307 | return x; |
7c6db5e5 DS |
308 | } |
309 | ||
6ffb221a | 310 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 311 | { |
3535a3c1 | 312 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 313 | outb(command, ec->command_addr); |
d8d031a6 | 314 | ec->timestamp = jiffies; |
45bea155 LY |
315 | } |
316 | ||
6ffb221a | 317 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 318 | { |
3535a3c1 | 319 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 320 | outb(data, ec->data_addr); |
d8d031a6 | 321 | ec->timestamp = jiffies; |
703959d4 | 322 | } |
45bea155 | 323 | |
4625d752 | 324 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
e34c0e2b LZ |
325 | static const char *acpi_ec_cmd_string(u8 cmd) |
326 | { | |
327 | switch (cmd) { | |
328 | case 0x80: | |
329 | return "RD_EC"; | |
330 | case 0x81: | |
331 | return "WR_EC"; | |
332 | case 0x82: | |
333 | return "BE_EC"; | |
334 | case 0x83: | |
335 | return "BD_EC"; | |
336 | case 0x84: | |
337 | return "QR_EC"; | |
338 | } | |
339 | return "UNKNOWN"; | |
340 | } | |
341 | #else | |
342 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
343 | #endif | |
344 | ||
ca37bfdf LZ |
345 | /* -------------------------------------------------------------------------- |
346 | * GPE Registers | |
347 | * -------------------------------------------------------------------------- */ | |
348 | ||
349 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
350 | { | |
351 | acpi_event_status gpe_status = 0; | |
352 | ||
353 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 354 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
355 | } |
356 | ||
357 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
358 | { | |
359 | if (open) | |
360 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
361 | else { |
362 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 363 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 364 | } |
ca37bfdf LZ |
365 | if (acpi_ec_is_gpe_raised(ec)) { |
366 | /* | |
367 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
368 | * software need to manually trigger a pseudo GPE event on | |
369 | * EN=1 writes. | |
370 | */ | |
3535a3c1 | 371 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
372 | advance_transaction(ec); |
373 | } | |
374 | } | |
375 | ||
376 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
377 | { | |
378 | if (close) | |
379 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
380 | else { |
381 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 382 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 383 | } |
ca37bfdf LZ |
384 | } |
385 | ||
386 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
387 | { | |
388 | /* | |
389 | * GPE STS is a W1C register, which means: | |
390 | * 1. Software can clear it without worrying about clearing other | |
391 | * GPEs' STS bits when the hardware sets them in parallel. | |
392 | * 2. As long as software can ensure only clearing it when it is | |
393 | * set, hardware won't set it in parallel. | |
394 | * So software can clear GPE in any contexts. | |
395 | * Warning: do not move the check into advance_transaction() as the | |
396 | * EC commands will be sent without GPE raised. | |
397 | */ | |
398 | if (!acpi_ec_is_gpe_raised(ec)) | |
399 | return; | |
400 | acpi_clear_gpe(NULL, ec->gpe); | |
401 | } | |
402 | ||
403 | /* -------------------------------------------------------------------------- | |
404 | * Transaction Management | |
405 | * -------------------------------------------------------------------------- */ | |
406 | ||
9887d22a LZ |
407 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
408 | { | |
409 | ec->reference_count++; | |
0e1affe4 LZ |
410 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
411 | ec->reference_count == 1) | |
9887d22a LZ |
412 | acpi_ec_enable_gpe(ec, true); |
413 | } | |
414 | ||
415 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
416 | { | |
417 | bool flushed = false; | |
418 | ||
419 | ec->reference_count--; | |
0e1affe4 LZ |
420 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
421 | ec->reference_count == 0) | |
9887d22a LZ |
422 | acpi_ec_disable_gpe(ec, true); |
423 | flushed = acpi_ec_flushed(ec); | |
424 | if (flushed) | |
425 | wake_up(&ec->wait); | |
426 | } | |
427 | ||
e1d4d90f LZ |
428 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
429 | { | |
430 | if (!test_bit(flag, &ec->flags)) { | |
431 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 432 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
433 | set_bit(flag, &ec->flags); |
434 | } | |
435 | } | |
436 | ||
437 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
438 | { | |
439 | if (test_bit(flag, &ec->flags)) { | |
440 | clear_bit(flag, &ec->flags); | |
441 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 442 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
443 | } |
444 | } | |
445 | ||
9887d22a LZ |
446 | /* |
447 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
448 | * the flush operation is not in | |
449 | * progress | |
450 | * @ec: the EC device | |
451 | * | |
452 | * This function must be used before taking a new action that should hold | |
453 | * the reference count. If this function returns false, then the action | |
454 | * must be discarded or it will prevent the flush operation from being | |
455 | * completed. | |
456 | */ | |
37d11391 | 457 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 458 | { |
37d11391 RW |
459 | if (!acpi_ec_started(ec)) |
460 | return false; | |
9887d22a LZ |
461 | acpi_ec_submit_request(ec); |
462 | return true; | |
463 | } | |
464 | ||
37d11391 | 465 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 466 | { |
1ab69f27 LZ |
467 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); |
468 | if (!acpi_ec_event_enabled(ec)) | |
469 | return; | |
470 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
9d8993be LZ |
471 | ec_dbg_evt("Command(%s) submitted/blocked", |
472 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
473 | ec->nr_pending_queries++; | |
74443bbe LZ |
474 | schedule_work(&ec->work); |
475 | } | |
476 | } | |
477 | ||
37d11391 | 478 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe | 479 | { |
1ab69f27 | 480 | if (test_and_clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
9d8993be LZ |
481 | ec_dbg_evt("Command(%s) unblocked", |
482 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
1ab69f27 | 483 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); |
74443bbe LZ |
484 | } |
485 | ||
750f628b LZ |
486 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
487 | { | |
488 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
489 | ec_log_drv("event unblocked"); | |
e923e8e7 LZ |
490 | if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
491 | advance_transaction(ec); | |
750f628b LZ |
492 | } |
493 | ||
494 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) | |
495 | { | |
496 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
497 | ec_log_drv("event blocked"); | |
498 | } | |
499 | ||
750f628b LZ |
500 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
501 | { | |
502 | unsigned long flags; | |
503 | ||
504 | spin_lock_irqsave(&ec->lock, flags); | |
505 | if (acpi_ec_started(ec)) | |
506 | __acpi_ec_enable_event(ec); | |
507 | spin_unlock_irqrestore(&ec->lock, flags); | |
750f628b LZ |
508 | } |
509 | ||
eab05ec3 | 510 | #ifdef CONFIG_PM_SLEEP |
39a2a2aa LZ |
511 | static bool acpi_ec_query_flushed(struct acpi_ec *ec) |
512 | { | |
513 | bool flushed; | |
514 | unsigned long flags; | |
515 | ||
516 | spin_lock_irqsave(&ec->lock, flags); | |
517 | flushed = !ec->nr_pending_queries; | |
518 | spin_unlock_irqrestore(&ec->lock, flags); | |
519 | return flushed; | |
520 | } | |
521 | ||
522 | static void __acpi_ec_flush_event(struct acpi_ec *ec) | |
523 | { | |
524 | /* | |
525 | * When ec_freeze_events is true, we need to flush events in | |
526 | * the proper position before entering the noirq stage. | |
527 | */ | |
528 | wait_event(ec->wait, acpi_ec_query_flushed(ec)); | |
529 | if (ec_query_wq) | |
530 | flush_workqueue(ec_query_wq); | |
531 | } | |
532 | ||
533 | static void acpi_ec_disable_event(struct acpi_ec *ec) | |
534 | { | |
535 | unsigned long flags; | |
536 | ||
537 | spin_lock_irqsave(&ec->lock, flags); | |
538 | __acpi_ec_disable_event(ec); | |
539 | spin_unlock_irqrestore(&ec->lock, flags); | |
540 | __acpi_ec_flush_event(ec); | |
541 | } | |
880a6627 RW |
542 | |
543 | void acpi_ec_flush_work(void) | |
544 | { | |
545 | if (first_ec) | |
546 | __acpi_ec_flush_event(first_ec); | |
547 | ||
548 | flush_scheduled_work(); | |
549 | } | |
eab05ec3 | 550 | #endif /* CONFIG_PM_SLEEP */ |
39a2a2aa | 551 | |
1d68d261 LZ |
552 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
553 | { | |
61197547 LZ |
554 | bool guarded = true; |
555 | unsigned long flags; | |
556 | ||
557 | spin_lock_irqsave(&ec->lock, flags); | |
558 | /* | |
559 | * If firmware SCI_EVT clearing timing is "event", we actually | |
560 | * don't know when the SCI_EVT will be cleared by firmware after | |
561 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an | |
562 | * acceptable period. | |
563 | * | |
564 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is | |
565 | * flagged, which means SCI_EVT check has just been performed. | |
566 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the | |
567 | * guarding should have already been performed (via | |
568 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the | |
569 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into | |
570 | * ACPI_EC_COMMAND_POLL state immediately. | |
571 | */ | |
1d68d261 LZ |
572 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
573 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || | |
574 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || | |
575 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) | |
61197547 LZ |
576 | guarded = false; |
577 | spin_unlock_irqrestore(&ec->lock, flags); | |
578 | return guarded; | |
1d68d261 LZ |
579 | } |
580 | ||
d8d031a6 LZ |
581 | static int ec_transaction_polled(struct acpi_ec *ec) |
582 | { | |
583 | unsigned long flags; | |
584 | int ret = 0; | |
585 | ||
586 | spin_lock_irqsave(&ec->lock, flags); | |
587 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
588 | ret = 1; | |
589 | spin_unlock_irqrestore(&ec->lock, flags); | |
590 | return ret; | |
591 | } | |
592 | ||
f92fca00 | 593 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 594 | { |
7c6db4e0 AS |
595 | unsigned long flags; |
596 | int ret = 0; | |
7a73e60e | 597 | |
f351d027 | 598 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 599 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 600 | ret = 1; |
f351d027 | 601 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 602 | return ret; |
45bea155 | 603 | } |
451566f4 | 604 | |
f8b8eb71 LZ |
605 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
606 | { | |
607 | ec->curr->flags |= flag; | |
608 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
1d68d261 LZ |
609 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
610 | flag == ACPI_EC_COMMAND_POLL) | |
611 | acpi_ec_complete_query(ec); | |
612 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && | |
613 | flag == ACPI_EC_COMMAND_COMPLETE) | |
f8b8eb71 | 614 | acpi_ec_complete_query(ec); |
1d68d261 LZ |
615 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
616 | flag == ACPI_EC_COMMAND_COMPLETE) | |
617 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); | |
f8b8eb71 LZ |
618 | } |
619 | } | |
620 | ||
0c78808f | 621 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 622 | { |
36b15875 | 623 | struct transaction *t; |
66b42b78 | 624 | u8 status; |
c0d65341 | 625 | bool wakeup = false; |
b76b51ba | 626 | |
3535a3c1 LZ |
627 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
628 | smp_processor_id()); | |
ca37bfdf LZ |
629 | /* |
630 | * By always clearing STS before handling all indications, we can | |
631 | * ensure a hardware STS 0->1 change after this clearing can always | |
632 | * trigger a GPE interrupt. | |
633 | */ | |
634 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 635 | status = acpi_ec_read_status(ec); |
36b15875 | 636 | t = ec->curr; |
1d68d261 LZ |
637 | /* |
638 | * Another IRQ or a guarded polling mode advancement is detected, | |
639 | * the next QR_EC submission is then allowed. | |
640 | */ | |
641 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { | |
642 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && | |
66db3834 LZ |
643 | (!ec->nr_pending_queries || |
644 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { | |
1d68d261 LZ |
645 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
646 | acpi_ec_complete_query(ec); | |
647 | } | |
648 | } | |
b76b51ba | 649 | if (!t) |
f92fca00 LZ |
650 | goto err; |
651 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
652 | if (t->wlen > t->wi) { | |
653 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
654 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
655 | else | |
656 | goto err; | |
657 | } else if (t->rlen > t->ri) { | |
658 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
659 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 660 | if (t->rlen == t->ri) { |
f8b8eb71 | 661 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
3afcf2ec | 662 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
663 | ec_dbg_evt("Command(%s) completed by hardware", |
664 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 LZ |
665 | wakeup = true; |
666 | } | |
f92fca00 LZ |
667 | } else |
668 | goto err; | |
669 | } else if (t->wlen == t->wi && | |
c0d65341 | 670 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f8b8eb71 | 671 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
672 | wakeup = true; |
673 | } | |
0c78808f | 674 | goto out; |
f92fca00 | 675 | } else { |
79149001 LZ |
676 | if (EC_FLAGS_QUERY_HANDSHAKE && |
677 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec | 678 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
f8b8eb71 | 679 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
3afcf2ec | 680 | t->rdata[t->ri++] = 0x00; |
f8b8eb71 | 681 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
9d8993be LZ |
682 | ec_dbg_evt("Command(%s) completed by software", |
683 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
3afcf2ec LZ |
684 | wakeup = true; |
685 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 | 686 | acpi_ec_write_cmd(ec, t->command); |
f8b8eb71 | 687 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
7c6db4e0 | 688 | } else |
dd15f8c4 | 689 | goto err; |
0c78808f | 690 | goto out; |
f92fca00 | 691 | } |
dd15f8c4 | 692 | err: |
a3cd8d27 FT |
693 | /* |
694 | * If SCI bit is set, then don't think it's a false IRQ | |
695 | * otherwise will take a not handled IRQ as a false one. | |
696 | */ | |
f92fca00 | 697 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
698 | if (in_interrupt() && t) { |
699 | if (t->irq_count < ec_storm_threshold) | |
700 | ++t->irq_count; | |
701 | /* Allow triggering on 0 threshold */ | |
702 | if (t->irq_count == ec_storm_threshold) | |
703 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
704 | } | |
f92fca00 | 705 | } |
0c78808f | 706 | out: |
74443bbe | 707 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 708 | acpi_ec_submit_query(ec); |
0c78808f LZ |
709 | if (wakeup && in_interrupt()) |
710 | wake_up(&ec->wait); | |
f92fca00 | 711 | } |
a3cd8d27 | 712 | |
f92fca00 LZ |
713 | static void start_transaction(struct acpi_ec *ec) |
714 | { | |
715 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
716 | ec->curr->flags = 0; | |
d8d031a6 LZ |
717 | } |
718 | ||
719 | static int ec_guard(struct acpi_ec *ec) | |
720 | { | |
c3a696b6 | 721 | unsigned long guard = usecs_to_jiffies(ec->polling_guard); |
d8d031a6 LZ |
722 | unsigned long timeout = ec->timestamp + guard; |
723 | ||
61197547 | 724 | /* Ensure guarding period before polling EC status */ |
d8d031a6 | 725 | do { |
c3a696b6 | 726 | if (ec->busy_polling) { |
d8d031a6 LZ |
727 | /* Perform busy polling */ |
728 | if (ec_transaction_completed(ec)) | |
729 | return 0; | |
730 | udelay(jiffies_to_usecs(guard)); | |
731 | } else { | |
732 | /* | |
733 | * Perform wait polling | |
61197547 LZ |
734 | * 1. Wait the transaction to be completed by the |
735 | * GPE handler after the transaction enters | |
736 | * ACPI_EC_COMMAND_POLL state. | |
737 | * 2. A special guarding logic is also required | |
738 | * for event clearing mode "event" before the | |
739 | * transaction enters ACPI_EC_COMMAND_POLL | |
740 | * state. | |
d8d031a6 | 741 | */ |
1d68d261 LZ |
742 | if (!ec_transaction_polled(ec) && |
743 | !acpi_ec_guard_event(ec)) | |
d8d031a6 LZ |
744 | break; |
745 | if (wait_event_timeout(ec->wait, | |
746 | ec_transaction_completed(ec), | |
747 | guard)) | |
748 | return 0; | |
749 | } | |
d8d031a6 LZ |
750 | } while (time_before(jiffies, timeout)); |
751 | return -ETIME; | |
845625cd | 752 | } |
03d1d99c | 753 | |
7c6db4e0 AS |
754 | static int ec_poll(struct acpi_ec *ec) |
755 | { | |
2a84cb98 | 756 | unsigned long flags; |
28fe5c82 | 757 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 758 | |
2a84cb98 AS |
759 | while (repeat--) { |
760 | unsigned long delay = jiffies + | |
7a18e96d | 761 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 762 | do { |
d8d031a6 LZ |
763 | if (!ec_guard(ec)) |
764 | return 0; | |
f92fca00 | 765 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 766 | advance_transaction(ec); |
f92fca00 | 767 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 768 | } while (time_before(jiffies, delay)); |
16a26e85 | 769 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 770 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 771 | start_transaction(ec); |
f351d027 | 772 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 773 | } |
b77d81b2 | 774 | return -ETIME; |
1da177e4 LT |
775 | } |
776 | ||
8463200a | 777 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 778 | struct transaction *t) |
45bea155 | 779 | { |
7c6db4e0 | 780 | unsigned long tmp; |
7c6db4e0 | 781 | int ret = 0; |
7a73e60e | 782 | |
7c6db4e0 | 783 | /* start transaction */ |
f351d027 | 784 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 785 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 786 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
787 | ret = -EINVAL; |
788 | goto unlock; | |
789 | } | |
770970f0 | 790 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 791 | /* following two actions should be kept atomic */ |
8463200a | 792 | ec->curr = t; |
3535a3c1 | 793 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 794 | start_transaction(ec); |
df9ff918 | 795 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 796 | |
df9ff918 | 797 | ret = ec_poll(ec); |
d8d031a6 | 798 | |
df9ff918 | 799 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
800 | if (t->irq_count == ec_storm_threshold) |
801 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 802 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 803 | ec->curr = NULL; |
9887d22a LZ |
804 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
805 | acpi_ec_complete_request(ec); | |
770970f0 | 806 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 807 | unlock: |
f351d027 | 808 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
809 | return ret; |
810 | } | |
811 | ||
2a84cb98 | 812 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 813 | { |
d7a76e4c | 814 | int status; |
50526df6 | 815 | u32 glk; |
7a73e60e | 816 | |
8463200a | 817 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 818 | return -EINVAL; |
8463200a AS |
819 | if (t->rdata) |
820 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 821 | |
f351d027 | 822 | mutex_lock(&ec->mutex); |
703959d4 | 823 | if (ec->global_lock) { |
1da177e4 | 824 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 825 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
826 | status = -ENODEV; |
827 | goto unlock; | |
c24e912b | 828 | } |
1da177e4 | 829 | } |
a62e8f19 | 830 | |
2a84cb98 | 831 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 832 | |
703959d4 | 833 | if (ec->global_lock) |
1da177e4 | 834 | acpi_release_global_lock(glk); |
7c6db4e0 | 835 | unlock: |
f351d027 | 836 | mutex_unlock(&ec->mutex); |
d550d98d | 837 | return status; |
1da177e4 LT |
838 | } |
839 | ||
8a383ef0 | 840 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
841 | { |
842 | u8 d; | |
8463200a AS |
843 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
844 | .wdata = NULL, .rdata = &d, | |
845 | .wlen = 0, .rlen = 1}; | |
846 | ||
2a84cb98 | 847 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
848 | } |
849 | ||
8a383ef0 | 850 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 851 | { |
8463200a AS |
852 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
853 | .wdata = NULL, .rdata = NULL, | |
854 | .wlen = 0, .rlen = 0}; | |
855 | ||
7c6db4e0 | 856 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 857 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
858 | } |
859 | ||
7a73e60e | 860 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
861 | { |
862 | int result; | |
863 | u8 d; | |
8463200a AS |
864 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
865 | .wdata = &address, .rdata = &d, | |
866 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 867 | |
2a84cb98 | 868 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
869 | *data = d; |
870 | return result; | |
871 | } | |
6ffb221a | 872 | |
3576cf61 DS |
873 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
874 | { | |
6ccedb10 | 875 | u8 wdata[2] = { address, data }; |
8463200a AS |
876 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
877 | .wdata = wdata, .rdata = NULL, | |
878 | .wlen = 2, .rlen = 0}; | |
879 | ||
2a84cb98 | 880 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
881 | } |
882 | ||
b76b51ba | 883 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 884 | { |
1da177e4 | 885 | int err; |
6ffb221a | 886 | u8 temp_data; |
1da177e4 LT |
887 | |
888 | if (!first_ec) | |
889 | return -ENODEV; | |
890 | ||
d033879c | 891 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
892 | |
893 | if (!err) { | |
894 | *val = temp_data; | |
895 | return 0; | |
7a73e60e LZ |
896 | } |
897 | return err; | |
1da177e4 LT |
898 | } |
899 | EXPORT_SYMBOL(ec_read); | |
900 | ||
50526df6 | 901 | int ec_write(u8 addr, u8 val) |
1da177e4 | 902 | { |
1da177e4 LT |
903 | int err; |
904 | ||
905 | if (!first_ec) | |
906 | return -ENODEV; | |
907 | ||
d033879c | 908 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
909 | |
910 | return err; | |
911 | } | |
912 | EXPORT_SYMBOL(ec_write); | |
913 | ||
616362de | 914 | int ec_transaction(u8 command, |
7a73e60e LZ |
915 | const u8 *wdata, unsigned wdata_len, |
916 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 917 | { |
8463200a AS |
918 | struct transaction t = {.command = command, |
919 | .wdata = wdata, .rdata = rdata, | |
920 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 921 | |
d7a76e4c LP |
922 | if (!first_ec) |
923 | return -ENODEV; | |
45bea155 | 924 | |
2a84cb98 | 925 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 926 | } |
ab9e43c6 LP |
927 | EXPORT_SYMBOL(ec_transaction); |
928 | ||
3e2abc5a SF |
929 | /* Get the handle to the EC device */ |
930 | acpi_handle ec_get_handle(void) | |
931 | { | |
932 | if (!first_ec) | |
933 | return NULL; | |
934 | return first_ec->handle; | |
935 | } | |
3e2abc5a SF |
936 | EXPORT_SYMBOL(ec_get_handle); |
937 | ||
ad479e7f LZ |
938 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
939 | { | |
940 | unsigned long flags; | |
941 | ||
942 | spin_lock_irqsave(&ec->lock, flags); | |
943 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 944 | ec_dbg_drv("Starting EC"); |
9887d22a | 945 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 946 | if (!resuming) { |
9887d22a | 947 | acpi_ec_submit_request(ec); |
770970f0 | 948 | ec_dbg_ref(ec, "Increase driver"); |
c2b46d67 | 949 | } |
3535a3c1 | 950 | ec_log_drv("EC started"); |
ad479e7f LZ |
951 | } |
952 | spin_unlock_irqrestore(&ec->lock, flags); | |
953 | } | |
954 | ||
9887d22a LZ |
955 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
956 | { | |
957 | unsigned long flags; | |
958 | bool flushed; | |
959 | ||
960 | spin_lock_irqsave(&ec->lock, flags); | |
961 | flushed = acpi_ec_flushed(ec); | |
962 | spin_unlock_irqrestore(&ec->lock, flags); | |
963 | return flushed; | |
964 | } | |
965 | ||
ad479e7f LZ |
966 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
967 | { | |
968 | unsigned long flags; | |
969 | ||
970 | spin_lock_irqsave(&ec->lock, flags); | |
971 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 972 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 973 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
974 | spin_unlock_irqrestore(&ec->lock, flags); |
975 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
976 | spin_lock_irqsave(&ec->lock, flags); | |
977 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 978 | if (!suspending) { |
9887d22a | 979 | acpi_ec_complete_request(ec); |
770970f0 | 980 | ec_dbg_ref(ec, "Decrease driver"); |
39a2a2aa | 981 | } else if (!ec_freeze_events) |
750f628b | 982 | __acpi_ec_disable_event(ec); |
ad479e7f LZ |
983 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
984 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 985 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
986 | } |
987 | spin_unlock_irqrestore(&ec->lock, flags); | |
988 | } | |
989 | ||
c3a696b6 LZ |
990 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) |
991 | { | |
992 | unsigned long flags; | |
993 | ||
994 | spin_lock_irqsave(&ec->lock, flags); | |
995 | ec->busy_polling = true; | |
996 | ec->polling_guard = 0; | |
997 | ec_log_drv("interrupt blocked"); | |
998 | spin_unlock_irqrestore(&ec->lock, flags); | |
999 | } | |
1000 | ||
1001 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) | |
1002 | { | |
1003 | unsigned long flags; | |
1004 | ||
1005 | spin_lock_irqsave(&ec->lock, flags); | |
1006 | ec->busy_polling = ec_busy_polling; | |
1007 | ec->polling_guard = ec_polling_guard; | |
1008 | ec_log_drv("interrupt unblocked"); | |
1009 | spin_unlock_irqrestore(&ec->lock, flags); | |
1010 | } | |
1011 | ||
fe955682 | 1012 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
1013 | { |
1014 | struct acpi_ec *ec = first_ec; | |
1015 | ||
1016 | if (!ec) | |
1017 | return; | |
1018 | ||
f351d027 | 1019 | mutex_lock(&ec->mutex); |
f6bb13aa | 1020 | /* Prevent transactions from being carried out */ |
ad479e7f | 1021 | acpi_ec_stop(ec, true); |
f351d027 | 1022 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
1023 | } |
1024 | ||
fe955682 | 1025 | void acpi_ec_unblock_transactions(void) |
d5a64513 RW |
1026 | { |
1027 | /* | |
1028 | * Allow transactions to happen again (this function is called from | |
1029 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
1030 | */ | |
1031 | if (first_ec) | |
ad479e7f | 1032 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
1033 | } |
1034 | ||
1da177e4 LT |
1035 | /* -------------------------------------------------------------------------- |
1036 | Event Management | |
1037 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
1038 | static struct acpi_ec_query_handler * |
1039 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
1040 | { | |
1041 | if (handler) | |
1042 | kref_get(&handler->kref); | |
1043 | return handler; | |
1044 | } | |
1045 | ||
0700c047 LZ |
1046 | static struct acpi_ec_query_handler * |
1047 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) | |
1048 | { | |
1049 | struct acpi_ec_query_handler *handler; | |
1050 | bool found = false; | |
1051 | ||
1052 | mutex_lock(&ec->mutex); | |
1053 | list_for_each_entry(handler, &ec->list, node) { | |
1054 | if (value == handler->query_bit) { | |
1055 | found = true; | |
1056 | break; | |
1057 | } | |
1058 | } | |
1059 | mutex_unlock(&ec->mutex); | |
1060 | return found ? acpi_ec_get_query_handler(handler) : NULL; | |
1061 | } | |
1062 | ||
01305d41 LZ |
1063 | static void acpi_ec_query_handler_release(struct kref *kref) |
1064 | { | |
1065 | struct acpi_ec_query_handler *handler = | |
1066 | container_of(kref, struct acpi_ec_query_handler, kref); | |
1067 | ||
1068 | kfree(handler); | |
1069 | } | |
1070 | ||
1071 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
1072 | { | |
1073 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
1074 | } | |
1075 | ||
837012ed AS |
1076 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
1077 | acpi_handle handle, acpi_ec_query_func func, | |
1078 | void *data) | |
1079 | { | |
1080 | struct acpi_ec_query_handler *handler = | |
1081 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 1082 | |
837012ed AS |
1083 | if (!handler) |
1084 | return -ENOMEM; | |
1085 | ||
1086 | handler->query_bit = query_bit; | |
1087 | handler->handle = handle; | |
1088 | handler->func = func; | |
1089 | handler->data = data; | |
f351d027 | 1090 | mutex_lock(&ec->mutex); |
01305d41 | 1091 | kref_init(&handler->kref); |
30c08574 | 1092 | list_add(&handler->node, &ec->list); |
f351d027 | 1093 | mutex_unlock(&ec->mutex); |
837012ed AS |
1094 | return 0; |
1095 | } | |
837012ed AS |
1096 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
1097 | ||
0700c047 LZ |
1098 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
1099 | bool remove_all, u8 query_bit) | |
837012ed | 1100 | { |
1544fdbc | 1101 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 1102 | LIST_HEAD(free_list); |
7a73e60e | 1103 | |
f351d027 | 1104 | mutex_lock(&ec->mutex); |
1544fdbc | 1105 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
0700c047 | 1106 | if (remove_all || query_bit == handler->query_bit) { |
01305d41 LZ |
1107 | list_del_init(&handler->node); |
1108 | list_add(&handler->node, &free_list); | |
837012ed AS |
1109 | } |
1110 | } | |
f351d027 | 1111 | mutex_unlock(&ec->mutex); |
6b5eab54 | 1112 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 1113 | acpi_ec_put_query_handler(handler); |
837012ed | 1114 | } |
0700c047 LZ |
1115 | |
1116 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
1117 | { | |
1118 | acpi_ec_remove_query_handlers(ec, false, query_bit); | |
1119 | } | |
837012ed | 1120 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 1121 | |
02b771b6 | 1122 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
45bea155 | 1123 | { |
02b771b6 LZ |
1124 | struct acpi_ec_query *q; |
1125 | struct transaction *t; | |
1126 | ||
1127 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); | |
1128 | if (!q) | |
1129 | return NULL; | |
1130 | INIT_WORK(&q->work, acpi_ec_event_processor); | |
1131 | t = &q->transaction; | |
1132 | t->command = ACPI_EC_COMMAND_QUERY; | |
1133 | t->rdata = pval; | |
1134 | t->rlen = 1; | |
1135 | return q; | |
1136 | } | |
1137 | ||
1138 | static void acpi_ec_delete_query(struct acpi_ec_query *q) | |
1139 | { | |
1140 | if (q) { | |
1141 | if (q->handler) | |
1142 | acpi_ec_put_query_handler(q->handler); | |
1143 | kfree(q); | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | static void acpi_ec_event_processor(struct work_struct *work) | |
1148 | { | |
1149 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); | |
1150 | struct acpi_ec_query_handler *handler = q->handler; | |
7a73e60e | 1151 | |
3535a3c1 | 1152 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
1153 | if (handler->func) |
1154 | handler->func(handler->data); | |
1155 | else if (handler->handle) | |
1156 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 1157 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
02b771b6 | 1158 | acpi_ec_delete_query(q); |
a62e8f19 AS |
1159 | } |
1160 | ||
550b3aac | 1161 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
1162 | { |
1163 | u8 value = 0; | |
c2cf5769 | 1164 | int result; |
02b771b6 LZ |
1165 | struct acpi_ec_query *q; |
1166 | ||
1167 | q = acpi_ec_create_query(&value); | |
1168 | if (!q) | |
1169 | return -ENOMEM; | |
3eba563e | 1170 | |
550b3aac LZ |
1171 | /* |
1172 | * Query the EC to find out which _Qxx method we need to evaluate. | |
1173 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
1174 | * bit to be cleared (and thus clearing the interrupt source). | |
1175 | */ | |
02b771b6 | 1176 | result = acpi_ec_transaction(ec, &q->transaction); |
550b3aac | 1177 | if (!value) |
02b771b6 LZ |
1178 | result = -ENODATA; |
1179 | if (result) | |
1180 | goto err_exit; | |
3eba563e | 1181 | |
0700c047 LZ |
1182 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
1183 | if (!q->handler) { | |
1184 | result = -ENODATA; | |
1185 | goto err_exit; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * It is reported that _Qxx are evaluated in a parallel way on | |
1190 | * Windows: | |
1191 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 | |
1192 | * | |
1193 | * Put this log entry before schedule_work() in order to make | |
1194 | * it appearing before any other log entries occurred during the | |
1195 | * work queue execution. | |
1196 | */ | |
1197 | ec_dbg_evt("Query(0x%02x) scheduled", value); | |
e1191bd4 | 1198 | if (!queue_work(ec_query_wq, &q->work)) { |
0700c047 LZ |
1199 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
1200 | result = -EBUSY; | |
837012ed | 1201 | } |
02b771b6 LZ |
1202 | |
1203 | err_exit: | |
4981c2b7 | 1204 | if (result) |
02b771b6 LZ |
1205 | acpi_ec_delete_query(q); |
1206 | if (data) | |
1207 | *data = value; | |
c2cf5769 | 1208 | return result; |
a62e8f19 AS |
1209 | } |
1210 | ||
1d68d261 LZ |
1211 | static void acpi_ec_check_event(struct acpi_ec *ec) |
1212 | { | |
1213 | unsigned long flags; | |
1214 | ||
1215 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { | |
1216 | if (ec_guard(ec)) { | |
1217 | spin_lock_irqsave(&ec->lock, flags); | |
1218 | /* | |
1219 | * Take care of the SCI_EVT unless no one else is | |
1220 | * taking care of it. | |
1221 | */ | |
1222 | if (!ec->curr) | |
1223 | advance_transaction(ec); | |
1224 | spin_unlock_irqrestore(&ec->lock, flags); | |
1225 | } | |
1226 | } | |
1227 | } | |
1228 | ||
9d8993be | 1229 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 1230 | { |
9d8993be | 1231 | unsigned long flags; |
74443bbe | 1232 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 1233 | |
9d8993be LZ |
1234 | ec_dbg_evt("Event started"); |
1235 | ||
1236 | spin_lock_irqsave(&ec->lock, flags); | |
1237 | while (ec->nr_pending_queries) { | |
1238 | spin_unlock_irqrestore(&ec->lock, flags); | |
1239 | (void)acpi_ec_query(ec, NULL); | |
1240 | spin_lock_irqsave(&ec->lock, flags); | |
1241 | ec->nr_pending_queries--; | |
66db3834 LZ |
1242 | /* |
1243 | * Before exit, make sure that this work item can be | |
1244 | * scheduled again. There might be QR_EC failures, leaving | |
1245 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work | |
1246 | * item from being scheduled again. | |
1247 | */ | |
1248 | if (!ec->nr_pending_queries) { | |
1249 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || | |
1250 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) | |
1251 | acpi_ec_complete_query(ec); | |
1252 | } | |
9d8993be LZ |
1253 | } |
1254 | spin_unlock_irqrestore(&ec->lock, flags); | |
1255 | ||
1256 | ec_dbg_evt("Event stopped"); | |
1d68d261 LZ |
1257 | |
1258 | acpi_ec_check_event(ec); | |
45bea155 | 1259 | } |
1da177e4 | 1260 | |
8b6cd8ad LM |
1261 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
1262 | u32 gpe_number, void *data) | |
1da177e4 | 1263 | { |
f92fca00 | 1264 | unsigned long flags; |
3d02b90b | 1265 | struct acpi_ec *ec = data; |
7c6db4e0 | 1266 | |
f92fca00 | 1267 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 1268 | advance_transaction(ec); |
c0d65341 | 1269 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 1270 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
1271 | } |
1272 | ||
1da177e4 | 1273 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1274 | * Address Space Management |
1275 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1276 | |
1da177e4 | 1277 | static acpi_status |
5b7734b4 | 1278 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1279 | u32 bits, u64 *value64, |
50526df6 | 1280 | void *handler_context, void *region_context) |
1da177e4 | 1281 | { |
3d02b90b | 1282 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1283 | int result = 0, i, bytes = bits / 8; |
1284 | u8 *value = (u8 *)value64; | |
1da177e4 | 1285 | |
1da177e4 | 1286 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1287 | return AE_BAD_PARAMETER; |
1da177e4 | 1288 | |
5b7734b4 | 1289 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1290 | return AE_BAD_PARAMETER; |
1da177e4 | 1291 | |
c3a696b6 | 1292 | if (ec->busy_polling || bits > 8) |
6a63b06f | 1293 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1294 | |
dadf28a1 AS |
1295 | for (i = 0; i < bytes; ++i, ++address, ++value) |
1296 | result = (function == ACPI_READ) ? | |
1297 | acpi_ec_read(ec, address, value) : | |
1298 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1299 | |
c3a696b6 | 1300 | if (ec->busy_polling || bits > 8) |
6a63b06f | 1301 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1302 | |
1da177e4 LT |
1303 | switch (result) { |
1304 | case -EINVAL: | |
d550d98d | 1305 | return AE_BAD_PARAMETER; |
1da177e4 | 1306 | case -ENODEV: |
d550d98d | 1307 | return AE_NOT_FOUND; |
1da177e4 | 1308 | case -ETIME: |
d550d98d | 1309 | return AE_TIME; |
1da177e4 | 1310 | default: |
d550d98d | 1311 | return AE_OK; |
1da177e4 | 1312 | } |
1da177e4 LT |
1313 | } |
1314 | ||
1da177e4 | 1315 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1316 | * Driver Interface |
1317 | * -------------------------------------------------------------------------- */ | |
1318 | ||
c0900c35 AS |
1319 | static acpi_status |
1320 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1321 | ||
72c77b7e LZ |
1322 | static void acpi_ec_free(struct acpi_ec *ec) |
1323 | { | |
1324 | if (first_ec == ec) | |
1325 | first_ec = NULL; | |
1326 | if (boot_ec == ec) | |
1327 | boot_ec = NULL; | |
1328 | kfree(ec); | |
1329 | } | |
1330 | ||
1331 | static struct acpi_ec *acpi_ec_alloc(void) | |
c0900c35 AS |
1332 | { |
1333 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1334 | |
c0900c35 AS |
1335 | if (!ec) |
1336 | return NULL; | |
f351d027 | 1337 | mutex_init(&ec->mutex); |
c0900c35 | 1338 | init_waitqueue_head(&ec->wait); |
837012ed | 1339 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1340 | spin_lock_init(&ec->lock); |
9d8993be | 1341 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1342 | ec->timestamp = jiffies; |
c3a696b6 LZ |
1343 | ec->busy_polling = true; |
1344 | ec->polling_guard = 0; | |
c0900c35 AS |
1345 | return ec; |
1346 | } | |
837012ed | 1347 | |
c019b193 AS |
1348 | static acpi_status |
1349 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1350 | void *context, void **return_value) | |
1351 | { | |
0175d562 LM |
1352 | char node_name[5]; |
1353 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1354 | struct acpi_ec *ec = context; |
1355 | int value = 0; | |
0175d562 LM |
1356 | acpi_status status; |
1357 | ||
1358 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1359 | ||
7a73e60e | 1360 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1361 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1362 | return AE_OK; |
1363 | } | |
1364 | ||
cd8c93a4 AS |
1365 | static acpi_status |
1366 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1367 | { |
cd8c93a4 | 1368 | acpi_status status; |
d21cf3c1 | 1369 | unsigned long long tmp = 0; |
cd8c93a4 | 1370 | struct acpi_ec *ec = context; |
a5032bfd AS |
1371 | |
1372 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1373 | ec->command_addr = ec->data_addr = 0; | |
1374 | ||
cd8c93a4 AS |
1375 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1376 | ec_parse_io_ports, ec); | |
1377 | if (ACPI_FAILURE(status)) | |
1378 | return status; | |
ae56c9fd LZ |
1379 | if (ec->data_addr == 0 || ec->command_addr == 0) |
1380 | return AE_OK; | |
837012ed | 1381 | |
440f53da CC |
1382 | if (boot_ec && boot_ec_is_ecdt && EC_FLAGS_IGNORE_DSDT_GPE) { |
1383 | /* | |
1384 | * Always inherit the GPE number setting from the ECDT | |
1385 | * EC. | |
1386 | */ | |
1387 | ec->gpe = boot_ec->gpe; | |
1388 | } else { | |
1389 | /* Get GPE bit assignment (EC events). */ | |
1390 | /* TODO: Add support for _GPE returning a package */ | |
1391 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); | |
1392 | if (ACPI_FAILURE(status)) | |
1393 | return status; | |
1394 | ec->gpe = tmp; | |
1395 | } | |
837012ed | 1396 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1397 | tmp = 0; |
27663c58 MW |
1398 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1399 | ec->global_lock = tmp; | |
837012ed | 1400 | ec->handle = handle; |
cd8c93a4 | 1401 | return AE_CTRL_TERMINATE; |
837012ed AS |
1402 | } |
1403 | ||
72c77b7e LZ |
1404 | /* |
1405 | * Note: This function returns an error code only when the address space | |
1406 | * handler is not installed, which means "not able to handle | |
1407 | * transactions". | |
1408 | */ | |
2a570840 | 1409 | static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) |
5efc5476 BH |
1410 | { |
1411 | acpi_status status; | |
7a73e60e | 1412 | |
ad479e7f | 1413 | acpi_ec_start(ec, false); |
0e1affe4 LZ |
1414 | |
1415 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { | |
c3a696b6 | 1416 | acpi_ec_enter_noirq(ec); |
0e1affe4 LZ |
1417 | status = acpi_install_address_space_handler(ec->handle, |
1418 | ACPI_ADR_SPACE_EC, | |
1419 | &acpi_ec_space_handler, | |
1420 | NULL, ec); | |
1421 | if (ACPI_FAILURE(status)) { | |
1422 | if (status == AE_NOT_FOUND) { | |
1423 | /* | |
1424 | * Maybe OS fails in evaluating the _REG | |
1425 | * object. The AE_NOT_FOUND error will be | |
1426 | * ignored and OS * continue to initialize | |
1427 | * EC. | |
1428 | */ | |
1429 | pr_err("Fail in evaluating the _REG object" | |
1430 | " of EC device. Broken bios is suspected.\n"); | |
1431 | } else { | |
1432 | acpi_ec_stop(ec, false); | |
1433 | return -ENODEV; | |
1434 | } | |
1435 | } | |
1436 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1437 | } | |
1438 | ||
2a570840 LZ |
1439 | if (!handle_events) |
1440 | return 0; | |
1441 | ||
1442 | if (!test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { | |
1443 | /* Find and register all query methods */ | |
1444 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
1445 | acpi_ec_register_query_methods, | |
1446 | NULL, ec, NULL); | |
1447 | set_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); | |
1448 | } | |
0e1affe4 LZ |
1449 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1450 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, | |
1451 | ACPI_GPE_EDGE_TRIGGERED, | |
1452 | &acpi_ec_gpe_handler, ec); | |
1453 | /* This is not fatal as we can poll EC events */ | |
1454 | if (ACPI_SUCCESS(status)) { | |
1455 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
c3a696b6 | 1456 | acpi_ec_leave_noirq(ec); |
0e1affe4 LZ |
1457 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && |
1458 | ec->reference_count >= 1) | |
1459 | acpi_ec_enable_gpe(ec, true); | |
2a570840 LZ |
1460 | |
1461 | /* EC is fully operational, allow queries */ | |
1462 | acpi_ec_enable_event(ec); | |
5efc5476 BH |
1463 | } |
1464 | } | |
1465 | ||
5efc5476 BH |
1466 | return 0; |
1467 | } | |
1468 | ||
4c611060 AS |
1469 | static void ec_remove_handlers(struct acpi_ec *ec) |
1470 | { | |
0e1affe4 LZ |
1471 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
1472 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
1473 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
1474 | pr_err("failed to remove space handler\n"); | |
1475 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1476 | } | |
1477 | ||
fa5b4a50 LZ |
1478 | /* |
1479 | * Stops handling the EC transactions after removing the operation | |
1480 | * region handler. This is required because _REG(DISCONNECT) | |
1481 | * invoked during the removal can result in new EC transactions. | |
1482 | * | |
1483 | * Flushes the EC requests and thus disables the GPE before | |
1484 | * removing the GPE handler. This is required by the current ACPICA | |
1485 | * GPE core. ACPICA GPE core will automatically disable a GPE when | |
1486 | * it is indicated but there is no way to handle it. So the drivers | |
1487 | * must disable the GPEs prior to removing the GPE handlers. | |
1488 | */ | |
1489 | acpi_ec_stop(ec, false); | |
1490 | ||
0e1affe4 LZ |
1491 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1492 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
1493 | &acpi_ec_gpe_handler))) | |
1494 | pr_err("failed to remove gpe handler\n"); | |
1495 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1496 | } | |
2a570840 LZ |
1497 | if (test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
1498 | acpi_ec_remove_query_handlers(ec, true, 0); | |
1499 | clear_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); | |
1500 | } | |
4c611060 AS |
1501 | } |
1502 | ||
2a570840 | 1503 | static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events) |
1da177e4 | 1504 | { |
72c77b7e | 1505 | int ret; |
c0900c35 | 1506 | |
2a570840 | 1507 | ret = ec_install_handlers(ec, handle_events); |
72c77b7e LZ |
1508 | if (ret) |
1509 | return ret; | |
1510 | ||
1511 | /* First EC capable of handling transactions */ | |
1512 | if (!first_ec) { | |
1513 | first_ec = ec; | |
1514 | acpi_handle_info(first_ec->handle, "Used as first EC\n"); | |
a5032bfd | 1515 | } |
72c77b7e LZ |
1516 | |
1517 | acpi_handle_info(ec->handle, | |
1518 | "GPE=0x%lx, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", | |
1519 | ec->gpe, ec->command_addr, ec->data_addr); | |
1520 | return ret; | |
1521 | } | |
1522 | ||
2a570840 LZ |
1523 | static int acpi_config_boot_ec(struct acpi_ec *ec, acpi_handle handle, |
1524 | bool handle_events, bool is_ecdt) | |
72c77b7e LZ |
1525 | { |
1526 | int ret; | |
1527 | ||
2a570840 LZ |
1528 | /* |
1529 | * Changing the ACPI handle results in a re-configuration of the | |
1530 | * boot EC. And if it happens after the namespace initialization, | |
1531 | * it causes _REG evaluations. | |
1532 | */ | |
1533 | if (boot_ec && boot_ec->handle != handle) | |
72c77b7e LZ |
1534 | ec_remove_handlers(boot_ec); |
1535 | ||
1536 | /* Unset old boot EC */ | |
1537 | if (boot_ec != ec) | |
1538 | acpi_ec_free(boot_ec); | |
1539 | ||
2a570840 LZ |
1540 | /* |
1541 | * ECDT device creation is split into acpi_ec_ecdt_probe() and | |
1542 | * acpi_ec_ecdt_start(). This function takes care of completing the | |
1543 | * ECDT parsing logic as the handle update should be performed | |
1544 | * between the installation/uninstallation of the handlers. | |
1545 | */ | |
1546 | if (ec->handle != handle) | |
1547 | ec->handle = handle; | |
1548 | ||
1549 | ret = acpi_ec_setup(ec, handle_events); | |
72c77b7e LZ |
1550 | if (ret) |
1551 | return ret; | |
1552 | ||
1553 | /* Set new boot EC */ | |
1554 | if (!boot_ec) { | |
1555 | boot_ec = ec; | |
1556 | boot_ec_is_ecdt = is_ecdt; | |
72c77b7e | 1557 | } |
2a570840 LZ |
1558 | |
1559 | acpi_handle_info(boot_ec->handle, | |
1560 | "Used as boot %s EC to handle transactions%s\n", | |
1561 | is_ecdt ? "ECDT" : "DSDT", | |
1562 | handle_events ? " and events" : ""); | |
72c77b7e | 1563 | return ret; |
fd6231e7 LZ |
1564 | } |
1565 | ||
97cb159f LZ |
1566 | static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle) |
1567 | { | |
1568 | struct acpi_table_ecdt *ecdt_ptr; | |
1569 | acpi_status status; | |
1570 | acpi_handle handle; | |
1571 | ||
1572 | status = acpi_get_table(ACPI_SIG_ECDT, 1, | |
1573 | (struct acpi_table_header **)&ecdt_ptr); | |
1574 | if (ACPI_FAILURE(status)) | |
1575 | return false; | |
1576 | ||
1577 | status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); | |
1578 | if (ACPI_FAILURE(status)) | |
1579 | return false; | |
1580 | ||
1581 | *phandle = handle; | |
1582 | return true; | |
1583 | } | |
1584 | ||
1585 | static bool acpi_is_boot_ec(struct acpi_ec *ec) | |
1586 | { | |
1587 | if (!boot_ec) | |
1588 | return false; | |
1589 | if (ec->handle == boot_ec->handle && | |
1590 | ec->gpe == boot_ec->gpe && | |
1591 | ec->command_addr == boot_ec->command_addr && | |
1592 | ec->data_addr == boot_ec->data_addr) | |
1593 | return true; | |
1594 | return false; | |
1595 | } | |
1596 | ||
fd6231e7 LZ |
1597 | static int acpi_ec_add(struct acpi_device *device) |
1598 | { | |
1599 | struct acpi_ec *ec = NULL; | |
1600 | int ret; | |
1601 | ||
1602 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1603 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1604 | ||
1605 | ec = acpi_ec_alloc(); | |
1606 | if (!ec) | |
1607 | return -ENOMEM; | |
a5032bfd AS |
1608 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
1609 | AE_CTRL_TERMINATE) { | |
46922d2a LZ |
1610 | ret = -EINVAL; |
1611 | goto err_alloc; | |
4c611060 AS |
1612 | } |
1613 | ||
97cb159f LZ |
1614 | if (acpi_is_boot_ec(ec)) { |
1615 | boot_ec_is_ecdt = false; | |
1616 | acpi_handle_debug(ec->handle, "duplicated.\n"); | |
1617 | acpi_ec_free(ec); | |
1618 | ec = boot_ec; | |
1619 | ret = acpi_config_boot_ec(ec, ec->handle, true, false); | |
1620 | } else | |
1621 | ret = acpi_ec_setup(ec, true); | |
46922d2a LZ |
1622 | if (ret) |
1623 | goto err_query; | |
1624 | ||
db89b4f0 | 1625 | device->driver_data = ec; |
de4f1046 | 1626 | |
d6795fe3 AK |
1627 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1628 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1629 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1630 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1631 | |
1c832b3e LT |
1632 | /* Reprobe devices depending on the EC */ |
1633 | acpi_walk_dep_device_list(ec->handle); | |
97cb159f | 1634 | acpi_handle_debug(ec->handle, "enumerated.\n"); |
46922d2a LZ |
1635 | return 0; |
1636 | ||
1637 | err_query: | |
97cb159f LZ |
1638 | if (ec != boot_ec) |
1639 | acpi_ec_remove_query_handlers(ec, true, 0); | |
46922d2a | 1640 | err_alloc: |
97cb159f LZ |
1641 | if (ec != boot_ec) |
1642 | acpi_ec_free(ec); | |
5efc5476 | 1643 | return ret; |
1da177e4 LT |
1644 | } |
1645 | ||
51fac838 | 1646 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1647 | { |
01f22462 | 1648 | struct acpi_ec *ec; |
1da177e4 | 1649 | |
1da177e4 | 1650 | if (!device) |
d550d98d | 1651 | return -EINVAL; |
1da177e4 LT |
1652 | |
1653 | ec = acpi_driver_data(device); | |
de4f1046 TR |
1654 | release_region(ec->data_addr, 1); |
1655 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1656 | device->driver_data = NULL; |
97cb159f LZ |
1657 | if (ec != boot_ec) { |
1658 | ec_remove_handlers(ec); | |
1659 | acpi_ec_free(ec); | |
1660 | } | |
d550d98d | 1661 | return 0; |
1da177e4 LT |
1662 | } |
1663 | ||
1da177e4 | 1664 | static acpi_status |
c0900c35 | 1665 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1666 | { |
3d02b90b | 1667 | struct acpi_ec *ec = context; |
1da177e4 | 1668 | |
01f22462 | 1669 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1670 | return AE_OK; |
1da177e4 LT |
1671 | |
1672 | /* | |
1673 | * The first address region returned is the data port, and | |
1674 | * the second address region returned is the status/command | |
1675 | * port. | |
1676 | */ | |
de4f1046 | 1677 | if (ec->data_addr == 0) |
6ffb221a | 1678 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1679 | else if (ec->command_addr == 0) |
6ffb221a | 1680 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1681 | else |
1da177e4 | 1682 | return AE_CTRL_TERMINATE; |
1da177e4 | 1683 | |
1da177e4 LT |
1684 | return AE_OK; |
1685 | } | |
1686 | ||
dcf15cbd LZ |
1687 | static const struct acpi_device_id ec_device_ids[] = { |
1688 | {"PNP0C09", 0}, | |
1689 | {"", 0}, | |
1690 | }; | |
1691 | ||
c712bb58 LZ |
1692 | /* |
1693 | * This function is not Windows-compatible as Windows never enumerates the | |
1694 | * namespace EC before the main ACPI device enumeration process. It is | |
1695 | * retained for historical reason and will be deprecated in the future. | |
1696 | */ | |
dcf15cbd | 1697 | int __init acpi_ec_dsdt_probe(void) |
c04209a7 | 1698 | { |
dcf15cbd | 1699 | acpi_status status; |
fd6231e7 LZ |
1700 | struct acpi_ec *ec; |
1701 | int ret; | |
dcf15cbd | 1702 | |
c712bb58 LZ |
1703 | /* |
1704 | * If a platform has ECDT, there is no need to proceed as the | |
1705 | * following probe is not a part of the ACPI device enumeration, | |
1706 | * executing _STA is not safe, and thus this probe may risk of | |
1707 | * picking up an invalid EC device. | |
1708 | */ | |
1709 | if (boot_ec) | |
1710 | return -ENODEV; | |
1711 | ||
fd6231e7 LZ |
1712 | ec = acpi_ec_alloc(); |
1713 | if (!ec) | |
1714 | return -ENOMEM; | |
dcf15cbd | 1715 | /* |
2a570840 LZ |
1716 | * At this point, the namespace is initialized, so start to find |
1717 | * the namespace objects. | |
dcf15cbd | 1718 | */ |
dcf15cbd | 1719 | status = acpi_get_devices(ec_device_ids[0].id, |
fd6231e7 LZ |
1720 | ec_parse_device, ec, NULL); |
1721 | if (ACPI_FAILURE(status) || !ec->handle) { | |
1722 | ret = -ENODEV; | |
1723 | goto error; | |
c04209a7 | 1724 | } |
2a570840 LZ |
1725 | /* |
1726 | * When the DSDT EC is available, always re-configure boot EC to | |
1727 | * have _REG evaluated. _REG can only be evaluated after the | |
1728 | * namespace initialization. | |
1729 | * At this point, the GPE is not fully initialized, so do not to | |
1730 | * handle the events. | |
1731 | */ | |
1732 | ret = acpi_config_boot_ec(ec, ec->handle, false, false); | |
fd6231e7 LZ |
1733 | error: |
1734 | if (ret) | |
72c77b7e | 1735 | acpi_ec_free(ec); |
fd6231e7 | 1736 | return ret; |
c04209a7 AS |
1737 | } |
1738 | ||
2a570840 LZ |
1739 | /* |
1740 | * If the DSDT EC is not functioning, we still need to prepare a fully | |
1741 | * functioning ECDT EC first in order to handle the events. | |
1742 | * https://bugzilla.kernel.org/show_bug.cgi?id=115021 | |
1743 | */ | |
98529b92 | 1744 | static int __init acpi_ec_ecdt_start(void) |
2a570840 | 1745 | { |
2a570840 LZ |
1746 | acpi_handle handle; |
1747 | ||
1748 | if (!boot_ec) | |
1749 | return -ENODEV; | |
1750 | /* | |
1751 | * The DSDT EC should have already been started in | |
1752 | * acpi_ec_add(). | |
1753 | */ | |
1754 | if (!boot_ec_is_ecdt) | |
1755 | return -ENODEV; | |
1756 | ||
2a570840 LZ |
1757 | /* |
1758 | * At this point, the namespace and the GPE is initialized, so | |
1759 | * start to find the namespace objects and handle the events. | |
1760 | */ | |
97cb159f | 1761 | if (!acpi_ec_ecdt_get_handle(&handle)) |
2a570840 LZ |
1762 | return -ENODEV; |
1763 | return acpi_config_boot_ec(boot_ec, handle, true, true); | |
1764 | } | |
1765 | ||
3cb02aeb | 1766 | #if 0 |
79149001 | 1767 | /* |
3cb02aeb LZ |
1768 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
1769 | * set, for which case, we complete the QR_EC without issuing it to the | |
1770 | * firmware. | |
1771 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 | |
1772 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 | |
79149001 LZ |
1773 | */ |
1774 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1775 | { | |
1776 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1777 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1778 | return 0; | |
1779 | } | |
3cb02aeb | 1780 | #endif |
79149001 | 1781 | |
bc539567 LZ |
1782 | /* |
1783 | * Some ECDTs contain wrong register addresses. | |
1784 | * MSI MS-171F | |
1785 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1786 | */ | |
59f0aa94 LZ |
1787 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
1788 | { | |
1789 | pr_debug("Detected system needing ECDT address correction.\n"); | |
1790 | EC_FLAGS_CORRECT_ECDT = 1; | |
1791 | return 0; | |
1792 | } | |
1793 | ||
440f53da CC |
1794 | /* |
1795 | * Some DSDTs contain wrong GPE setting. | |
ef75040a | 1796 | * Asus FX502VD/VE, GL702VMK, X550VXK, X580VD |
440f53da CC |
1797 | * https://bugzilla.kernel.org/show_bug.cgi?id=195651 |
1798 | */ | |
1799 | static int ec_honor_ecdt_gpe(const struct dmi_system_id *id) | |
1800 | { | |
1801 | pr_debug("Detected system needing ignore DSDT GPE setting.\n"); | |
1802 | EC_FLAGS_IGNORE_DSDT_GPE = 1; | |
1803 | return 0; | |
1804 | } | |
1805 | ||
6cef7497 | 1806 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
0adf3c74 | 1807 | { |
59f0aa94 | 1808 | ec_correct_ecdt, "MSI MS-171F", { |
3174abcf LZ |
1809 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
1810 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, | |
440f53da CC |
1811 | { |
1812 | ec_honor_ecdt_gpe, "ASUS FX502VD", { | |
1813 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
1814 | DMI_MATCH(DMI_PRODUCT_NAME, "FX502VD"),}, NULL}, | |
1815 | { | |
1816 | ec_honor_ecdt_gpe, "ASUS FX502VE", { | |
1817 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
1818 | DMI_MATCH(DMI_PRODUCT_NAME, "FX502VE"),}, NULL}, | |
1819 | { | |
ef75040a CC |
1820 | ec_honor_ecdt_gpe, "ASUS GL702VMK", { |
1821 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
1822 | DMI_MATCH(DMI_PRODUCT_NAME, "GL702VMK"),}, NULL}, | |
1823 | { | |
440f53da CC |
1824 | ec_honor_ecdt_gpe, "ASUS X550VXK", { |
1825 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
1826 | DMI_MATCH(DMI_PRODUCT_NAME, "X550VXK"),}, NULL}, | |
1827 | { | |
1828 | ec_honor_ecdt_gpe, "ASUS X580VD", { | |
1829 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
1830 | DMI_MATCH(DMI_PRODUCT_NAME, "X580VD"),}, NULL}, | |
0adf3c74 AS |
1831 | {}, |
1832 | }; | |
1833 | ||
c0900c35 AS |
1834 | int __init acpi_ec_ecdt_probe(void) |
1835 | { | |
fd6231e7 | 1836 | int ret; |
c0900c35 | 1837 | acpi_status status; |
50526df6 | 1838 | struct acpi_table_ecdt *ecdt_ptr; |
fd6231e7 | 1839 | struct acpi_ec *ec; |
45bea155 | 1840 | |
fd6231e7 LZ |
1841 | ec = acpi_ec_alloc(); |
1842 | if (!ec) | |
c0900c35 AS |
1843 | return -ENOMEM; |
1844 | /* | |
1845 | * Generate a boot ec context | |
1846 | */ | |
0adf3c74 | 1847 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1848 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1849 | (struct acpi_table_header **)&ecdt_ptr); | |
59f0aa94 LZ |
1850 | if (ACPI_FAILURE(status)) { |
1851 | ret = -ENODEV; | |
1852 | goto error; | |
cd8c93a4 | 1853 | } |
0adf3c74 | 1854 | |
59f0aa94 LZ |
1855 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
1856 | /* | |
1857 | * Asus X50GL: | |
1858 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 | |
1859 | */ | |
1860 | ret = -ENODEV; | |
1861 | goto error; | |
ed4b197d | 1862 | } |
478fa03b | 1863 | |
59f0aa94 | 1864 | if (EC_FLAGS_CORRECT_ECDT) { |
fd6231e7 LZ |
1865 | ec->command_addr = ecdt_ptr->data.address; |
1866 | ec->data_addr = ecdt_ptr->control.address; | |
c6cb0e87 | 1867 | } else { |
fd6231e7 LZ |
1868 | ec->command_addr = ecdt_ptr->control.address; |
1869 | ec->data_addr = ecdt_ptr->data.address; | |
c6cb0e87 | 1870 | } |
fd6231e7 | 1871 | ec->gpe = ecdt_ptr->gpe; |
2a570840 LZ |
1872 | |
1873 | /* | |
1874 | * At this point, the namespace is not initialized, so do not find | |
1875 | * the namespace objects, or handle the events. | |
1876 | */ | |
1877 | ret = acpi_config_boot_ec(ec, ACPI_ROOT_OBJECT, false, true); | |
c5279dee | 1878 | error: |
fd6231e7 | 1879 | if (ret) |
72c77b7e | 1880 | acpi_ec_free(ec); |
59f0aa94 | 1881 | return ret; |
1da177e4 LT |
1882 | } |
1883 | ||
df45db61 | 1884 | #ifdef CONFIG_PM_SLEEP |
39a2a2aa LZ |
1885 | static int acpi_ec_suspend(struct device *dev) |
1886 | { | |
1887 | struct acpi_ec *ec = | |
1888 | acpi_driver_data(to_acpi_device(dev)); | |
1889 | ||
8110dd28 | 1890 | if (acpi_sleep_no_ec_events() && ec_freeze_events) |
39a2a2aa LZ |
1891 | acpi_ec_disable_event(ec); |
1892 | return 0; | |
1893 | } | |
1894 | ||
76380636 RW |
1895 | static int acpi_ec_suspend_noirq(struct device *dev) |
1896 | { | |
1897 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); | |
1898 | ||
1899 | /* | |
1900 | * The SCI handler doesn't run at this point, so the GPE can be | |
1901 | * masked at the low level without side effects. | |
1902 | */ | |
1903 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
1904 | ec->reference_count >= 1) | |
1905 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); | |
1906 | ||
1907 | return 0; | |
1908 | } | |
1909 | ||
1910 | static int acpi_ec_resume_noirq(struct device *dev) | |
1911 | { | |
1912 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); | |
1913 | ||
1914 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
1915 | ec->reference_count >= 1) | |
1916 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); | |
1917 | ||
1918 | return 0; | |
1919 | } | |
1920 | ||
c2b46d67 LZ |
1921 | static int acpi_ec_resume(struct device *dev) |
1922 | { | |
1923 | struct acpi_ec *ec = | |
1924 | acpi_driver_data(to_acpi_device(dev)); | |
1925 | ||
1926 | acpi_ec_enable_event(ec); | |
1927 | return 0; | |
1928 | } | |
df45db61 LZ |
1929 | #endif |
1930 | ||
1931 | static const struct dev_pm_ops acpi_ec_pm = { | |
76380636 | 1932 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) |
39a2a2aa | 1933 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
df45db61 LZ |
1934 | }; |
1935 | ||
1d68d261 LZ |
1936 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
1937 | { | |
1938 | int result = 0; | |
1939 | ||
1940 | if (!strncmp(val, "status", sizeof("status") - 1)) { | |
1941 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
1942 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); | |
1943 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { | |
1944 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; | |
1945 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); | |
1946 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { | |
1947 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; | |
1948 | pr_info("Assuming SCI_EVT clearing on event reads\n"); | |
1949 | } else | |
1950 | result = -EINVAL; | |
1951 | return result; | |
1952 | } | |
1953 | ||
1954 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) | |
1955 | { | |
1956 | switch (ec_event_clearing) { | |
1957 | case ACPI_EC_EVT_TIMING_STATUS: | |
1958 | return sprintf(buffer, "status"); | |
1959 | case ACPI_EC_EVT_TIMING_QUERY: | |
1960 | return sprintf(buffer, "query"); | |
1961 | case ACPI_EC_EVT_TIMING_EVENT: | |
1962 | return sprintf(buffer, "event"); | |
1963 | default: | |
1964 | return sprintf(buffer, "invalid"); | |
1965 | } | |
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, | |
1970 | NULL, 0644); | |
1971 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); | |
1972 | ||
223883b7 AS |
1973 | static struct acpi_driver acpi_ec_driver = { |
1974 | .name = "ec", | |
1975 | .class = ACPI_EC_CLASS, | |
1976 | .ids = ec_device_ids, | |
1977 | .ops = { | |
1978 | .add = acpi_ec_add, | |
1979 | .remove = acpi_ec_remove, | |
223883b7 | 1980 | }, |
df45db61 | 1981 | .drv.pm = &acpi_ec_pm, |
223883b7 AS |
1982 | }; |
1983 | ||
e1191bd4 LZ |
1984 | static inline int acpi_ec_query_init(void) |
1985 | { | |
1986 | if (!ec_query_wq) { | |
1987 | ec_query_wq = alloc_workqueue("kec_query", 0, | |
1988 | ec_max_queries); | |
1989 | if (!ec_query_wq) | |
1990 | return -ENODEV; | |
1991 | } | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | static inline void acpi_ec_query_exit(void) | |
1996 | { | |
1997 | if (ec_query_wq) { | |
1998 | destroy_workqueue(ec_query_wq); | |
1999 | ec_query_wq = NULL; | |
2000 | } | |
2001 | } | |
2002 | ||
a5f820fe | 2003 | int __init acpi_ec_init(void) |
1da177e4 | 2004 | { |
e1191bd4 | 2005 | int result; |
98529b92 | 2006 | int ecdt_fail, dsdt_fail; |
1da177e4 | 2007 | |
e1191bd4 LZ |
2008 | /* register workqueue for _Qxx evaluations */ |
2009 | result = acpi_ec_query_init(); | |
2010 | if (result) | |
98529b92 | 2011 | return result; |
1da177e4 | 2012 | |
98529b92 LZ |
2013 | /* Drivers must be started after acpi_ec_query_init() */ |
2014 | ecdt_fail = acpi_ec_ecdt_start(); | |
2015 | dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver); | |
2016 | return ecdt_fail && dsdt_fail ? -ENODEV : 0; | |
1da177e4 LT |
2017 | } |
2018 | ||
1da177e4 LT |
2019 | /* EC driver currently not unloadable */ |
2020 | #if 0 | |
50526df6 | 2021 | static void __exit acpi_ec_exit(void) |
1da177e4 | 2022 | { |
1da177e4 LT |
2023 | |
2024 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
e1191bd4 | 2025 | acpi_ec_query_exit(); |
1da177e4 | 2026 | } |
7843932a | 2027 | #endif /* 0 */ |