Commit | Line | Data |
---|---|---|
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 { |
37d11391 | 107 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
1d68d261 | 108 | EC_FLAGS_QUERY_GUARDING, /* Guard for SCI_EVT check */ |
0e1affe4 LZ |
109 | EC_FLAGS_GPE_HANDLER_INSTALLED, /* GPE handler installed */ |
110 | EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ | |
ad479e7f LZ |
111 | EC_FLAGS_STARTED, /* Driver is started */ |
112 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
113 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
114 | * current command processing */ | |
1da177e4 | 115 | }; |
6ffb221a | 116 | |
f92fca00 LZ |
117 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
118 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
119 | ||
7a18e96d TR |
120 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
121 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
122 | module_param(ec_delay, uint, 0644); | |
123 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
124 | ||
e1191bd4 LZ |
125 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
126 | module_param(ec_max_queries, uint, 0644); | |
127 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); | |
128 | ||
15de603b LZ |
129 | static bool ec_busy_polling __read_mostly; |
130 | module_param(ec_busy_polling, bool, 0644); | |
131 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); | |
132 | ||
133 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; | |
134 | module_param(ec_polling_guard, uint, 0644); | |
135 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); | |
136 | ||
3cb02aeb | 137 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
1d68d261 | 138 | |
a520d52e FT |
139 | /* |
140 | * If the number of false interrupts per one transaction exceeds | |
141 | * this threshold, will think there is a GPE storm happened and | |
142 | * will disable the GPE for normal transaction. | |
143 | */ | |
144 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
145 | module_param(ec_storm_threshold, uint, 0644); | |
146 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
147 | ||
837012ed AS |
148 | struct acpi_ec_query_handler { |
149 | struct list_head node; | |
150 | acpi_ec_query_func func; | |
151 | acpi_handle handle; | |
152 | void *data; | |
153 | u8 query_bit; | |
01305d41 | 154 | struct kref kref; |
837012ed AS |
155 | }; |
156 | ||
8463200a | 157 | struct transaction { |
7c6db4e0 AS |
158 | const u8 *wdata; |
159 | u8 *rdata; | |
160 | unsigned short irq_count; | |
8463200a | 161 | u8 command; |
a2f93aea AS |
162 | u8 wi; |
163 | u8 ri; | |
7c6db4e0 AS |
164 | u8 wlen; |
165 | u8 rlen; | |
f92fca00 | 166 | u8 flags; |
7c6db4e0 AS |
167 | }; |
168 | ||
02b771b6 LZ |
169 | struct acpi_ec_query { |
170 | struct transaction transaction; | |
171 | struct work_struct work; | |
172 | struct acpi_ec_query_handler *handler; | |
173 | }; | |
174 | ||
550b3aac | 175 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 176 | static void advance_transaction(struct acpi_ec *ec); |
02b771b6 LZ |
177 | static void acpi_ec_event_handler(struct work_struct *work); |
178 | static void acpi_ec_event_processor(struct work_struct *work); | |
74443bbe | 179 | |
1195a098 TR |
180 | struct acpi_ec *boot_ec, *first_ec; |
181 | EXPORT_SYMBOL(first_ec); | |
e1191bd4 | 182 | static struct workqueue_struct *ec_query_wq; |
703959d4 | 183 | |
ad332c8a | 184 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 185 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
59f0aa94 | 186 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
5423a0cb | 187 | |
3535a3c1 LZ |
188 | /* -------------------------------------------------------------------------- |
189 | * Logging/Debugging | |
190 | * -------------------------------------------------------------------------- */ | |
191 | ||
192 | /* | |
193 | * Splitters used by the developers to track the boundary of the EC | |
194 | * handling processes. | |
195 | */ | |
196 | #ifdef DEBUG | |
197 | #define EC_DBG_SEP " " | |
198 | #define EC_DBG_DRV "+++++" | |
199 | #define EC_DBG_STM "=====" | |
200 | #define EC_DBG_REQ "*****" | |
201 | #define EC_DBG_EVT "#####" | |
202 | #else | |
203 | #define EC_DBG_SEP "" | |
204 | #define EC_DBG_DRV | |
205 | #define EC_DBG_STM | |
206 | #define EC_DBG_REQ | |
207 | #define EC_DBG_EVT | |
208 | #endif | |
209 | ||
210 | #define ec_log_raw(fmt, ...) \ | |
211 | pr_info(fmt "\n", ##__VA_ARGS__) | |
212 | #define ec_dbg_raw(fmt, ...) \ | |
213 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
214 | #define ec_log(filter, fmt, ...) \ | |
215 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
216 | #define ec_dbg(filter, fmt, ...) \ | |
217 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
218 | ||
219 | #define ec_log_drv(fmt, ...) \ | |
220 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
221 | #define ec_dbg_drv(fmt, ...) \ | |
222 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
223 | #define ec_dbg_stm(fmt, ...) \ | |
224 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
225 | #define ec_dbg_req(fmt, ...) \ | |
226 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
227 | #define ec_dbg_evt(fmt, ...) \ | |
228 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
229 | #define ec_dbg_ref(ec, fmt, ...) \ |
230 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 231 | |
ad479e7f LZ |
232 | /* -------------------------------------------------------------------------- |
233 | * Device Flags | |
234 | * -------------------------------------------------------------------------- */ | |
235 | ||
236 | static bool acpi_ec_started(struct acpi_ec *ec) | |
237 | { | |
238 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
239 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
240 | } | |
241 | ||
9887d22a LZ |
242 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
243 | { | |
244 | return ec->reference_count == 1; | |
245 | } | |
246 | ||
1da177e4 | 247 | /* -------------------------------------------------------------------------- |
ca37bfdf | 248 | * EC Registers |
7a73e60e | 249 | * -------------------------------------------------------------------------- */ |
1da177e4 | 250 | |
6ffb221a | 251 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 252 | { |
3ebe08a7 | 253 | u8 x = inb(ec->command_addr); |
7a73e60e | 254 | |
3535a3c1 LZ |
255 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
256 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
257 | x, | |
258 | !!(x & ACPI_EC_FLAG_SCI), | |
259 | !!(x & ACPI_EC_FLAG_BURST), | |
260 | !!(x & ACPI_EC_FLAG_CMD), | |
261 | !!(x & ACPI_EC_FLAG_IBF), | |
262 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 263 | return x; |
451566f4 DT |
264 | } |
265 | ||
6ffb221a | 266 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 267 | { |
3ebe08a7 | 268 | u8 x = inb(ec->data_addr); |
7a73e60e | 269 | |
d8d031a6 | 270 | ec->timestamp = jiffies; |
3535a3c1 | 271 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 272 | return x; |
7c6db5e5 DS |
273 | } |
274 | ||
6ffb221a | 275 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 276 | { |
3535a3c1 | 277 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 278 | outb(command, ec->command_addr); |
d8d031a6 | 279 | ec->timestamp = jiffies; |
45bea155 LY |
280 | } |
281 | ||
6ffb221a | 282 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 283 | { |
3535a3c1 | 284 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 285 | outb(data, ec->data_addr); |
d8d031a6 | 286 | ec->timestamp = jiffies; |
703959d4 | 287 | } |
45bea155 | 288 | |
e34c0e2b LZ |
289 | #ifdef DEBUG |
290 | static const char *acpi_ec_cmd_string(u8 cmd) | |
291 | { | |
292 | switch (cmd) { | |
293 | case 0x80: | |
294 | return "RD_EC"; | |
295 | case 0x81: | |
296 | return "WR_EC"; | |
297 | case 0x82: | |
298 | return "BE_EC"; | |
299 | case 0x83: | |
300 | return "BD_EC"; | |
301 | case 0x84: | |
302 | return "QR_EC"; | |
303 | } | |
304 | return "UNKNOWN"; | |
305 | } | |
306 | #else | |
307 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
308 | #endif | |
309 | ||
ca37bfdf LZ |
310 | /* -------------------------------------------------------------------------- |
311 | * GPE Registers | |
312 | * -------------------------------------------------------------------------- */ | |
313 | ||
314 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
315 | { | |
316 | acpi_event_status gpe_status = 0; | |
317 | ||
318 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 319 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
320 | } |
321 | ||
322 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
323 | { | |
324 | if (open) | |
325 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
326 | else { |
327 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 328 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 329 | } |
ca37bfdf LZ |
330 | if (acpi_ec_is_gpe_raised(ec)) { |
331 | /* | |
332 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
333 | * software need to manually trigger a pseudo GPE event on | |
334 | * EN=1 writes. | |
335 | */ | |
3535a3c1 | 336 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
337 | advance_transaction(ec); |
338 | } | |
339 | } | |
340 | ||
341 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
342 | { | |
343 | if (close) | |
344 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
345 | else { |
346 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 347 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 348 | } |
ca37bfdf LZ |
349 | } |
350 | ||
351 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
352 | { | |
353 | /* | |
354 | * GPE STS is a W1C register, which means: | |
355 | * 1. Software can clear it without worrying about clearing other | |
356 | * GPEs' STS bits when the hardware sets them in parallel. | |
357 | * 2. As long as software can ensure only clearing it when it is | |
358 | * set, hardware won't set it in parallel. | |
359 | * So software can clear GPE in any contexts. | |
360 | * Warning: do not move the check into advance_transaction() as the | |
361 | * EC commands will be sent without GPE raised. | |
362 | */ | |
363 | if (!acpi_ec_is_gpe_raised(ec)) | |
364 | return; | |
365 | acpi_clear_gpe(NULL, ec->gpe); | |
366 | } | |
367 | ||
368 | /* -------------------------------------------------------------------------- | |
369 | * Transaction Management | |
370 | * -------------------------------------------------------------------------- */ | |
371 | ||
9887d22a LZ |
372 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
373 | { | |
374 | ec->reference_count++; | |
0e1affe4 LZ |
375 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
376 | ec->reference_count == 1) | |
9887d22a LZ |
377 | acpi_ec_enable_gpe(ec, true); |
378 | } | |
379 | ||
380 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
381 | { | |
382 | bool flushed = false; | |
383 | ||
384 | ec->reference_count--; | |
0e1affe4 LZ |
385 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
386 | ec->reference_count == 0) | |
9887d22a LZ |
387 | acpi_ec_disable_gpe(ec, true); |
388 | flushed = acpi_ec_flushed(ec); | |
389 | if (flushed) | |
390 | wake_up(&ec->wait); | |
391 | } | |
392 | ||
e1d4d90f LZ |
393 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
394 | { | |
395 | if (!test_bit(flag, &ec->flags)) { | |
396 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 397 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
398 | set_bit(flag, &ec->flags); |
399 | } | |
400 | } | |
401 | ||
402 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
403 | { | |
404 | if (test_bit(flag, &ec->flags)) { | |
405 | clear_bit(flag, &ec->flags); | |
406 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 407 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
408 | } |
409 | } | |
410 | ||
9887d22a LZ |
411 | /* |
412 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
413 | * the flush operation is not in | |
414 | * progress | |
415 | * @ec: the EC device | |
416 | * | |
417 | * This function must be used before taking a new action that should hold | |
418 | * the reference count. If this function returns false, then the action | |
419 | * must be discarded or it will prevent the flush operation from being | |
420 | * completed. | |
421 | */ | |
37d11391 | 422 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 423 | { |
37d11391 RW |
424 | if (!acpi_ec_started(ec)) |
425 | return false; | |
9887d22a LZ |
426 | acpi_ec_submit_request(ec); |
427 | return true; | |
428 | } | |
429 | ||
37d11391 | 430 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 431 | { |
37d11391 | 432 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
9d8993be LZ |
433 | ec_dbg_evt("Command(%s) submitted/blocked", |
434 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
435 | ec->nr_pending_queries++; | |
74443bbe LZ |
436 | schedule_work(&ec->work); |
437 | } | |
438 | } | |
439 | ||
37d11391 | 440 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe | 441 | { |
f8b8eb71 | 442 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
37d11391 | 443 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
9d8993be LZ |
444 | ec_dbg_evt("Command(%s) unblocked", |
445 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
74443bbe LZ |
446 | } |
447 | } | |
448 | ||
1d68d261 LZ |
449 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
450 | { | |
61197547 LZ |
451 | bool guarded = true; |
452 | unsigned long flags; | |
453 | ||
454 | spin_lock_irqsave(&ec->lock, flags); | |
455 | /* | |
456 | * If firmware SCI_EVT clearing timing is "event", we actually | |
457 | * don't know when the SCI_EVT will be cleared by firmware after | |
458 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an | |
459 | * acceptable period. | |
460 | * | |
461 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is | |
462 | * flagged, which means SCI_EVT check has just been performed. | |
463 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the | |
464 | * guarding should have already been performed (via | |
465 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the | |
466 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into | |
467 | * ACPI_EC_COMMAND_POLL state immediately. | |
468 | */ | |
1d68d261 LZ |
469 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
470 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || | |
471 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || | |
472 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) | |
61197547 LZ |
473 | guarded = false; |
474 | spin_unlock_irqrestore(&ec->lock, flags); | |
475 | return guarded; | |
1d68d261 LZ |
476 | } |
477 | ||
d8d031a6 LZ |
478 | static int ec_transaction_polled(struct acpi_ec *ec) |
479 | { | |
480 | unsigned long flags; | |
481 | int ret = 0; | |
482 | ||
483 | spin_lock_irqsave(&ec->lock, flags); | |
484 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
485 | ret = 1; | |
486 | spin_unlock_irqrestore(&ec->lock, flags); | |
487 | return ret; | |
488 | } | |
489 | ||
f92fca00 | 490 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 491 | { |
7c6db4e0 AS |
492 | unsigned long flags; |
493 | int ret = 0; | |
7a73e60e | 494 | |
f351d027 | 495 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 496 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 497 | ret = 1; |
f351d027 | 498 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 499 | return ret; |
45bea155 | 500 | } |
451566f4 | 501 | |
f8b8eb71 LZ |
502 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
503 | { | |
504 | ec->curr->flags |= flag; | |
505 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
1d68d261 LZ |
506 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
507 | flag == ACPI_EC_COMMAND_POLL) | |
508 | acpi_ec_complete_query(ec); | |
509 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && | |
510 | flag == ACPI_EC_COMMAND_COMPLETE) | |
f8b8eb71 | 511 | acpi_ec_complete_query(ec); |
1d68d261 LZ |
512 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
513 | flag == ACPI_EC_COMMAND_COMPLETE) | |
514 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); | |
f8b8eb71 LZ |
515 | } |
516 | } | |
517 | ||
0c78808f | 518 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 519 | { |
36b15875 | 520 | struct transaction *t; |
66b42b78 | 521 | u8 status; |
c0d65341 | 522 | bool wakeup = false; |
b76b51ba | 523 | |
3535a3c1 LZ |
524 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
525 | smp_processor_id()); | |
ca37bfdf LZ |
526 | /* |
527 | * By always clearing STS before handling all indications, we can | |
528 | * ensure a hardware STS 0->1 change after this clearing can always | |
529 | * trigger a GPE interrupt. | |
530 | */ | |
531 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 532 | status = acpi_ec_read_status(ec); |
36b15875 | 533 | t = ec->curr; |
1d68d261 LZ |
534 | /* |
535 | * Another IRQ or a guarded polling mode advancement is detected, | |
536 | * the next QR_EC submission is then allowed. | |
537 | */ | |
538 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { | |
539 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && | |
66db3834 LZ |
540 | (!ec->nr_pending_queries || |
541 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { | |
1d68d261 LZ |
542 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
543 | acpi_ec_complete_query(ec); | |
544 | } | |
545 | } | |
b76b51ba | 546 | if (!t) |
f92fca00 LZ |
547 | goto err; |
548 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
549 | if (t->wlen > t->wi) { | |
550 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
551 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
552 | else | |
553 | goto err; | |
554 | } else if (t->rlen > t->ri) { | |
555 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
556 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 557 | if (t->rlen == t->ri) { |
f8b8eb71 | 558 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
3afcf2ec | 559 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
560 | ec_dbg_evt("Command(%s) completed by hardware", |
561 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 LZ |
562 | wakeup = true; |
563 | } | |
f92fca00 LZ |
564 | } else |
565 | goto err; | |
566 | } else if (t->wlen == t->wi && | |
c0d65341 | 567 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f8b8eb71 | 568 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
569 | wakeup = true; |
570 | } | |
0c78808f | 571 | goto out; |
f92fca00 | 572 | } else { |
79149001 LZ |
573 | if (EC_FLAGS_QUERY_HANDSHAKE && |
574 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec | 575 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
f8b8eb71 | 576 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
3afcf2ec | 577 | t->rdata[t->ri++] = 0x00; |
f8b8eb71 | 578 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
9d8993be LZ |
579 | ec_dbg_evt("Command(%s) completed by software", |
580 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
3afcf2ec LZ |
581 | wakeup = true; |
582 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 | 583 | acpi_ec_write_cmd(ec, t->command); |
f8b8eb71 | 584 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
7c6db4e0 | 585 | } else |
dd15f8c4 | 586 | goto err; |
0c78808f | 587 | goto out; |
f92fca00 | 588 | } |
dd15f8c4 | 589 | err: |
a3cd8d27 FT |
590 | /* |
591 | * If SCI bit is set, then don't think it's a false IRQ | |
592 | * otherwise will take a not handled IRQ as a false one. | |
593 | */ | |
f92fca00 | 594 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
595 | if (in_interrupt() && t) { |
596 | if (t->irq_count < ec_storm_threshold) | |
597 | ++t->irq_count; | |
598 | /* Allow triggering on 0 threshold */ | |
599 | if (t->irq_count == ec_storm_threshold) | |
600 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
601 | } | |
f92fca00 | 602 | } |
0c78808f | 603 | out: |
74443bbe | 604 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 605 | acpi_ec_submit_query(ec); |
0c78808f LZ |
606 | if (wakeup && in_interrupt()) |
607 | wake_up(&ec->wait); | |
f92fca00 | 608 | } |
a3cd8d27 | 609 | |
f92fca00 LZ |
610 | static void start_transaction(struct acpi_ec *ec) |
611 | { | |
612 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
613 | ec->curr->flags = 0; | |
d8d031a6 LZ |
614 | } |
615 | ||
616 | static int ec_guard(struct acpi_ec *ec) | |
617 | { | |
15de603b | 618 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
d8d031a6 LZ |
619 | unsigned long timeout = ec->timestamp + guard; |
620 | ||
61197547 | 621 | /* Ensure guarding period before polling EC status */ |
d8d031a6 | 622 | do { |
15de603b | 623 | if (ec_busy_polling) { |
d8d031a6 LZ |
624 | /* Perform busy polling */ |
625 | if (ec_transaction_completed(ec)) | |
626 | return 0; | |
627 | udelay(jiffies_to_usecs(guard)); | |
628 | } else { | |
629 | /* | |
630 | * Perform wait polling | |
61197547 LZ |
631 | * 1. Wait the transaction to be completed by the |
632 | * GPE handler after the transaction enters | |
633 | * ACPI_EC_COMMAND_POLL state. | |
634 | * 2. A special guarding logic is also required | |
635 | * for event clearing mode "event" before the | |
636 | * transaction enters ACPI_EC_COMMAND_POLL | |
637 | * state. | |
d8d031a6 | 638 | */ |
1d68d261 LZ |
639 | if (!ec_transaction_polled(ec) && |
640 | !acpi_ec_guard_event(ec)) | |
d8d031a6 LZ |
641 | break; |
642 | if (wait_event_timeout(ec->wait, | |
643 | ec_transaction_completed(ec), | |
644 | guard)) | |
645 | return 0; | |
646 | } | |
d8d031a6 LZ |
647 | } while (time_before(jiffies, timeout)); |
648 | return -ETIME; | |
845625cd | 649 | } |
03d1d99c | 650 | |
7c6db4e0 AS |
651 | static int ec_poll(struct acpi_ec *ec) |
652 | { | |
2a84cb98 | 653 | unsigned long flags; |
28fe5c82 | 654 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 655 | |
2a84cb98 AS |
656 | while (repeat--) { |
657 | unsigned long delay = jiffies + | |
7a18e96d | 658 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 659 | do { |
d8d031a6 LZ |
660 | if (!ec_guard(ec)) |
661 | return 0; | |
f92fca00 | 662 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 663 | advance_transaction(ec); |
f92fca00 | 664 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 665 | } while (time_before(jiffies, delay)); |
16a26e85 | 666 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 667 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 668 | start_transaction(ec); |
f351d027 | 669 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 670 | } |
b77d81b2 | 671 | return -ETIME; |
1da177e4 LT |
672 | } |
673 | ||
8463200a | 674 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 675 | struct transaction *t) |
45bea155 | 676 | { |
7c6db4e0 | 677 | unsigned long tmp; |
7c6db4e0 | 678 | int ret = 0; |
7a73e60e | 679 | |
7c6db4e0 | 680 | /* start transaction */ |
f351d027 | 681 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 682 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 683 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
684 | ret = -EINVAL; |
685 | goto unlock; | |
686 | } | |
770970f0 | 687 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 688 | /* following two actions should be kept atomic */ |
8463200a | 689 | ec->curr = t; |
3535a3c1 | 690 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 691 | start_transaction(ec); |
df9ff918 | 692 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 693 | |
df9ff918 | 694 | ret = ec_poll(ec); |
d8d031a6 | 695 | |
df9ff918 | 696 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
697 | if (t->irq_count == ec_storm_threshold) |
698 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 699 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 700 | ec->curr = NULL; |
9887d22a LZ |
701 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
702 | acpi_ec_complete_request(ec); | |
770970f0 | 703 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 704 | unlock: |
f351d027 | 705 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
706 | return ret; |
707 | } | |
708 | ||
2a84cb98 | 709 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 710 | { |
d7a76e4c | 711 | int status; |
50526df6 | 712 | u32 glk; |
7a73e60e | 713 | |
8463200a | 714 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 715 | return -EINVAL; |
8463200a AS |
716 | if (t->rdata) |
717 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 718 | |
f351d027 | 719 | mutex_lock(&ec->mutex); |
703959d4 | 720 | if (ec->global_lock) { |
1da177e4 | 721 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 722 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
723 | status = -ENODEV; |
724 | goto unlock; | |
c24e912b | 725 | } |
1da177e4 | 726 | } |
a62e8f19 | 727 | |
2a84cb98 | 728 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 729 | |
703959d4 | 730 | if (ec->global_lock) |
1da177e4 | 731 | acpi_release_global_lock(glk); |
7c6db4e0 | 732 | unlock: |
f351d027 | 733 | mutex_unlock(&ec->mutex); |
d550d98d | 734 | return status; |
1da177e4 LT |
735 | } |
736 | ||
8a383ef0 | 737 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
738 | { |
739 | u8 d; | |
8463200a AS |
740 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
741 | .wdata = NULL, .rdata = &d, | |
742 | .wlen = 0, .rlen = 1}; | |
743 | ||
2a84cb98 | 744 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
745 | } |
746 | ||
8a383ef0 | 747 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 748 | { |
8463200a AS |
749 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
750 | .wdata = NULL, .rdata = NULL, | |
751 | .wlen = 0, .rlen = 0}; | |
752 | ||
7c6db4e0 | 753 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 754 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
755 | } |
756 | ||
7a73e60e | 757 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
758 | { |
759 | int result; | |
760 | u8 d; | |
8463200a AS |
761 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
762 | .wdata = &address, .rdata = &d, | |
763 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 764 | |
2a84cb98 | 765 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
766 | *data = d; |
767 | return result; | |
768 | } | |
6ffb221a | 769 | |
3576cf61 DS |
770 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
771 | { | |
6ccedb10 | 772 | u8 wdata[2] = { address, data }; |
8463200a AS |
773 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
774 | .wdata = wdata, .rdata = NULL, | |
775 | .wlen = 2, .rlen = 0}; | |
776 | ||
2a84cb98 | 777 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
778 | } |
779 | ||
b76b51ba | 780 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 781 | { |
1da177e4 | 782 | int err; |
6ffb221a | 783 | u8 temp_data; |
1da177e4 LT |
784 | |
785 | if (!first_ec) | |
786 | return -ENODEV; | |
787 | ||
d033879c | 788 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
789 | |
790 | if (!err) { | |
791 | *val = temp_data; | |
792 | return 0; | |
7a73e60e LZ |
793 | } |
794 | return err; | |
1da177e4 LT |
795 | } |
796 | EXPORT_SYMBOL(ec_read); | |
797 | ||
50526df6 | 798 | int ec_write(u8 addr, u8 val) |
1da177e4 | 799 | { |
1da177e4 LT |
800 | int err; |
801 | ||
802 | if (!first_ec) | |
803 | return -ENODEV; | |
804 | ||
d033879c | 805 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
806 | |
807 | return err; | |
808 | } | |
809 | EXPORT_SYMBOL(ec_write); | |
810 | ||
616362de | 811 | int ec_transaction(u8 command, |
7a73e60e LZ |
812 | const u8 *wdata, unsigned wdata_len, |
813 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 814 | { |
8463200a AS |
815 | struct transaction t = {.command = command, |
816 | .wdata = wdata, .rdata = rdata, | |
817 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 818 | |
d7a76e4c LP |
819 | if (!first_ec) |
820 | return -ENODEV; | |
45bea155 | 821 | |
2a84cb98 | 822 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 823 | } |
ab9e43c6 LP |
824 | EXPORT_SYMBOL(ec_transaction); |
825 | ||
3e2abc5a SF |
826 | /* Get the handle to the EC device */ |
827 | acpi_handle ec_get_handle(void) | |
828 | { | |
829 | if (!first_ec) | |
830 | return NULL; | |
831 | return first_ec->handle; | |
832 | } | |
3e2abc5a SF |
833 | EXPORT_SYMBOL(ec_get_handle); |
834 | ||
ad332c8a | 835 | /* |
3eba563e | 836 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
837 | * Run with locked ec mutex. |
838 | */ | |
839 | static void acpi_ec_clear(struct acpi_ec *ec) | |
840 | { | |
841 | int i, status; | |
842 | u8 value = 0; | |
843 | ||
844 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 845 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
846 | if (status || !value) |
847 | break; | |
848 | } | |
849 | ||
850 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
851 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
852 | else | |
853 | pr_info("%d stale EC events cleared\n", i); | |
854 | } | |
855 | ||
ad479e7f LZ |
856 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
857 | { | |
858 | unsigned long flags; | |
859 | ||
860 | spin_lock_irqsave(&ec->lock, flags); | |
861 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 862 | ec_dbg_drv("Starting EC"); |
9887d22a | 863 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 864 | if (!resuming) { |
9887d22a | 865 | acpi_ec_submit_request(ec); |
770970f0 LZ |
866 | ec_dbg_ref(ec, "Increase driver"); |
867 | } | |
3535a3c1 | 868 | ec_log_drv("EC started"); |
ad479e7f LZ |
869 | } |
870 | spin_unlock_irqrestore(&ec->lock, flags); | |
871 | } | |
872 | ||
9887d22a LZ |
873 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
874 | { | |
875 | unsigned long flags; | |
876 | bool flushed; | |
877 | ||
878 | spin_lock_irqsave(&ec->lock, flags); | |
879 | flushed = acpi_ec_flushed(ec); | |
880 | spin_unlock_irqrestore(&ec->lock, flags); | |
881 | return flushed; | |
882 | } | |
883 | ||
ad479e7f LZ |
884 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
885 | { | |
886 | unsigned long flags; | |
887 | ||
888 | spin_lock_irqsave(&ec->lock, flags); | |
889 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 890 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 891 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
892 | spin_unlock_irqrestore(&ec->lock, flags); |
893 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
894 | spin_lock_irqsave(&ec->lock, flags); | |
895 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 896 | if (!suspending) { |
9887d22a | 897 | acpi_ec_complete_request(ec); |
770970f0 LZ |
898 | ec_dbg_ref(ec, "Decrease driver"); |
899 | } | |
ad479e7f LZ |
900 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
901 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 902 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
903 | } |
904 | spin_unlock_irqrestore(&ec->lock, flags); | |
905 | } | |
906 | ||
fe955682 | 907 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
908 | { |
909 | struct acpi_ec *ec = first_ec; | |
910 | ||
911 | if (!ec) | |
912 | return; | |
913 | ||
f351d027 | 914 | mutex_lock(&ec->mutex); |
f6bb13aa | 915 | /* Prevent transactions from being carried out */ |
ad479e7f | 916 | acpi_ec_stop(ec, true); |
f351d027 | 917 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
918 | } |
919 | ||
fe955682 | 920 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
921 | { |
922 | struct acpi_ec *ec = first_ec; | |
923 | ||
924 | if (!ec) | |
925 | return; | |
926 | ||
f6bb13aa | 927 | /* Allow transactions to be carried out again */ |
ad479e7f | 928 | acpi_ec_start(ec, true); |
ad332c8a KC |
929 | |
930 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
931 | acpi_ec_clear(ec); | |
f6bb13aa RW |
932 | } |
933 | ||
fe955682 | 934 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
935 | { |
936 | /* | |
937 | * Allow transactions to happen again (this function is called from | |
938 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
939 | */ | |
940 | if (first_ec) | |
ad479e7f | 941 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
942 | } |
943 | ||
1da177e4 LT |
944 | /* -------------------------------------------------------------------------- |
945 | Event Management | |
946 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
947 | static struct acpi_ec_query_handler * |
948 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
949 | { | |
950 | if (handler) | |
951 | kref_get(&handler->kref); | |
952 | return handler; | |
953 | } | |
954 | ||
0700c047 LZ |
955 | static struct acpi_ec_query_handler * |
956 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) | |
957 | { | |
958 | struct acpi_ec_query_handler *handler; | |
959 | bool found = false; | |
960 | ||
961 | mutex_lock(&ec->mutex); | |
962 | list_for_each_entry(handler, &ec->list, node) { | |
963 | if (value == handler->query_bit) { | |
964 | found = true; | |
965 | break; | |
966 | } | |
967 | } | |
968 | mutex_unlock(&ec->mutex); | |
969 | return found ? acpi_ec_get_query_handler(handler) : NULL; | |
970 | } | |
971 | ||
01305d41 LZ |
972 | static void acpi_ec_query_handler_release(struct kref *kref) |
973 | { | |
974 | struct acpi_ec_query_handler *handler = | |
975 | container_of(kref, struct acpi_ec_query_handler, kref); | |
976 | ||
977 | kfree(handler); | |
978 | } | |
979 | ||
980 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
981 | { | |
982 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
983 | } | |
984 | ||
837012ed AS |
985 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
986 | acpi_handle handle, acpi_ec_query_func func, | |
987 | void *data) | |
988 | { | |
989 | struct acpi_ec_query_handler *handler = | |
990 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 991 | |
837012ed AS |
992 | if (!handler) |
993 | return -ENOMEM; | |
994 | ||
995 | handler->query_bit = query_bit; | |
996 | handler->handle = handle; | |
997 | handler->func = func; | |
998 | handler->data = data; | |
f351d027 | 999 | mutex_lock(&ec->mutex); |
01305d41 | 1000 | kref_init(&handler->kref); |
30c08574 | 1001 | list_add(&handler->node, &ec->list); |
f351d027 | 1002 | mutex_unlock(&ec->mutex); |
837012ed AS |
1003 | return 0; |
1004 | } | |
837012ed AS |
1005 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
1006 | ||
0700c047 LZ |
1007 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
1008 | bool remove_all, u8 query_bit) | |
837012ed | 1009 | { |
1544fdbc | 1010 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 1011 | LIST_HEAD(free_list); |
7a73e60e | 1012 | |
f351d027 | 1013 | mutex_lock(&ec->mutex); |
1544fdbc | 1014 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
0700c047 | 1015 | if (remove_all || query_bit == handler->query_bit) { |
01305d41 LZ |
1016 | list_del_init(&handler->node); |
1017 | list_add(&handler->node, &free_list); | |
837012ed AS |
1018 | } |
1019 | } | |
f351d027 | 1020 | mutex_unlock(&ec->mutex); |
6b5eab54 | 1021 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 1022 | acpi_ec_put_query_handler(handler); |
837012ed | 1023 | } |
0700c047 LZ |
1024 | |
1025 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
1026 | { | |
1027 | acpi_ec_remove_query_handlers(ec, false, query_bit); | |
1028 | } | |
837012ed | 1029 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 1030 | |
02b771b6 | 1031 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
45bea155 | 1032 | { |
02b771b6 LZ |
1033 | struct acpi_ec_query *q; |
1034 | struct transaction *t; | |
1035 | ||
1036 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); | |
1037 | if (!q) | |
1038 | return NULL; | |
1039 | INIT_WORK(&q->work, acpi_ec_event_processor); | |
1040 | t = &q->transaction; | |
1041 | t->command = ACPI_EC_COMMAND_QUERY; | |
1042 | t->rdata = pval; | |
1043 | t->rlen = 1; | |
1044 | return q; | |
1045 | } | |
1046 | ||
1047 | static void acpi_ec_delete_query(struct acpi_ec_query *q) | |
1048 | { | |
1049 | if (q) { | |
1050 | if (q->handler) | |
1051 | acpi_ec_put_query_handler(q->handler); | |
1052 | kfree(q); | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | static void acpi_ec_event_processor(struct work_struct *work) | |
1057 | { | |
1058 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); | |
1059 | struct acpi_ec_query_handler *handler = q->handler; | |
7a73e60e | 1060 | |
3535a3c1 | 1061 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
1062 | if (handler->func) |
1063 | handler->func(handler->data); | |
1064 | else if (handler->handle) | |
1065 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 1066 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
02b771b6 | 1067 | acpi_ec_delete_query(q); |
a62e8f19 AS |
1068 | } |
1069 | ||
550b3aac | 1070 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
1071 | { |
1072 | u8 value = 0; | |
c2cf5769 | 1073 | int result; |
02b771b6 LZ |
1074 | struct acpi_ec_query *q; |
1075 | ||
1076 | q = acpi_ec_create_query(&value); | |
1077 | if (!q) | |
1078 | return -ENOMEM; | |
3eba563e | 1079 | |
550b3aac LZ |
1080 | /* |
1081 | * Query the EC to find out which _Qxx method we need to evaluate. | |
1082 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
1083 | * bit to be cleared (and thus clearing the interrupt source). | |
1084 | */ | |
02b771b6 | 1085 | result = acpi_ec_transaction(ec, &q->transaction); |
550b3aac | 1086 | if (!value) |
02b771b6 LZ |
1087 | result = -ENODATA; |
1088 | if (result) | |
1089 | goto err_exit; | |
3eba563e | 1090 | |
0700c047 LZ |
1091 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
1092 | if (!q->handler) { | |
1093 | result = -ENODATA; | |
1094 | goto err_exit; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * It is reported that _Qxx are evaluated in a parallel way on | |
1099 | * Windows: | |
1100 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 | |
1101 | * | |
1102 | * Put this log entry before schedule_work() in order to make | |
1103 | * it appearing before any other log entries occurred during the | |
1104 | * work queue execution. | |
1105 | */ | |
1106 | ec_dbg_evt("Query(0x%02x) scheduled", value); | |
e1191bd4 | 1107 | if (!queue_work(ec_query_wq, &q->work)) { |
0700c047 LZ |
1108 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
1109 | result = -EBUSY; | |
837012ed | 1110 | } |
02b771b6 LZ |
1111 | |
1112 | err_exit: | |
4981c2b7 | 1113 | if (result) |
02b771b6 LZ |
1114 | acpi_ec_delete_query(q); |
1115 | if (data) | |
1116 | *data = value; | |
c2cf5769 | 1117 | return result; |
a62e8f19 AS |
1118 | } |
1119 | ||
1d68d261 LZ |
1120 | static void acpi_ec_check_event(struct acpi_ec *ec) |
1121 | { | |
1122 | unsigned long flags; | |
1123 | ||
1124 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { | |
1125 | if (ec_guard(ec)) { | |
1126 | spin_lock_irqsave(&ec->lock, flags); | |
1127 | /* | |
1128 | * Take care of the SCI_EVT unless no one else is | |
1129 | * taking care of it. | |
1130 | */ | |
1131 | if (!ec->curr) | |
1132 | advance_transaction(ec); | |
1133 | spin_unlock_irqrestore(&ec->lock, flags); | |
1134 | } | |
1135 | } | |
1136 | } | |
1137 | ||
9d8993be | 1138 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 1139 | { |
9d8993be | 1140 | unsigned long flags; |
74443bbe | 1141 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 1142 | |
9d8993be LZ |
1143 | ec_dbg_evt("Event started"); |
1144 | ||
1145 | spin_lock_irqsave(&ec->lock, flags); | |
1146 | while (ec->nr_pending_queries) { | |
1147 | spin_unlock_irqrestore(&ec->lock, flags); | |
1148 | (void)acpi_ec_query(ec, NULL); | |
1149 | spin_lock_irqsave(&ec->lock, flags); | |
1150 | ec->nr_pending_queries--; | |
66db3834 LZ |
1151 | /* |
1152 | * Before exit, make sure that this work item can be | |
1153 | * scheduled again. There might be QR_EC failures, leaving | |
1154 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work | |
1155 | * item from being scheduled again. | |
1156 | */ | |
1157 | if (!ec->nr_pending_queries) { | |
1158 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || | |
1159 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) | |
1160 | acpi_ec_complete_query(ec); | |
1161 | } | |
9d8993be LZ |
1162 | } |
1163 | spin_unlock_irqrestore(&ec->lock, flags); | |
1164 | ||
1165 | ec_dbg_evt("Event stopped"); | |
1d68d261 LZ |
1166 | |
1167 | acpi_ec_check_event(ec); | |
45bea155 | 1168 | } |
1da177e4 | 1169 | |
8b6cd8ad LM |
1170 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
1171 | u32 gpe_number, void *data) | |
1da177e4 | 1172 | { |
f92fca00 | 1173 | unsigned long flags; |
3d02b90b | 1174 | struct acpi_ec *ec = data; |
7c6db4e0 | 1175 | |
f92fca00 | 1176 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 1177 | advance_transaction(ec); |
c0d65341 | 1178 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 1179 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
1180 | } |
1181 | ||
1da177e4 | 1182 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1183 | * Address Space Management |
1184 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1185 | |
1da177e4 | 1186 | static acpi_status |
5b7734b4 | 1187 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1188 | u32 bits, u64 *value64, |
50526df6 | 1189 | void *handler_context, void *region_context) |
1da177e4 | 1190 | { |
3d02b90b | 1191 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1192 | int result = 0, i, bytes = bits / 8; |
1193 | u8 *value = (u8 *)value64; | |
1da177e4 | 1194 | |
1da177e4 | 1195 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1196 | return AE_BAD_PARAMETER; |
1da177e4 | 1197 | |
5b7734b4 | 1198 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1199 | return AE_BAD_PARAMETER; |
1da177e4 | 1200 | |
15de603b | 1201 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1202 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1203 | |
dadf28a1 AS |
1204 | for (i = 0; i < bytes; ++i, ++address, ++value) |
1205 | result = (function == ACPI_READ) ? | |
1206 | acpi_ec_read(ec, address, value) : | |
1207 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1208 | |
15de603b | 1209 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1210 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1211 | |
1da177e4 LT |
1212 | switch (result) { |
1213 | case -EINVAL: | |
d550d98d | 1214 | return AE_BAD_PARAMETER; |
1da177e4 | 1215 | case -ENODEV: |
d550d98d | 1216 | return AE_NOT_FOUND; |
1da177e4 | 1217 | case -ETIME: |
d550d98d | 1218 | return AE_TIME; |
1da177e4 | 1219 | default: |
d550d98d | 1220 | return AE_OK; |
1da177e4 | 1221 | } |
1da177e4 LT |
1222 | } |
1223 | ||
1da177e4 | 1224 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1225 | * Driver Interface |
1226 | * -------------------------------------------------------------------------- */ | |
1227 | ||
c0900c35 AS |
1228 | static acpi_status |
1229 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1230 | ||
c0900c35 AS |
1231 | static struct acpi_ec *make_acpi_ec(void) |
1232 | { | |
1233 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1234 | |
c0900c35 AS |
1235 | if (!ec) |
1236 | return NULL; | |
37d11391 | 1237 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 1238 | mutex_init(&ec->mutex); |
c0900c35 | 1239 | init_waitqueue_head(&ec->wait); |
837012ed | 1240 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1241 | spin_lock_init(&ec->lock); |
9d8993be | 1242 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1243 | ec->timestamp = jiffies; |
c0900c35 AS |
1244 | return ec; |
1245 | } | |
837012ed | 1246 | |
c019b193 AS |
1247 | static acpi_status |
1248 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1249 | void *context, void **return_value) | |
1250 | { | |
0175d562 LM |
1251 | char node_name[5]; |
1252 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1253 | struct acpi_ec *ec = context; |
1254 | int value = 0; | |
0175d562 LM |
1255 | acpi_status status; |
1256 | ||
1257 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1258 | ||
7a73e60e | 1259 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1260 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1261 | return AE_OK; |
1262 | } | |
1263 | ||
cd8c93a4 AS |
1264 | static acpi_status |
1265 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1266 | { |
cd8c93a4 | 1267 | acpi_status status; |
d21cf3c1 | 1268 | unsigned long long tmp = 0; |
cd8c93a4 | 1269 | struct acpi_ec *ec = context; |
a5032bfd AS |
1270 | |
1271 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1272 | ec->command_addr = ec->data_addr = 0; | |
1273 | ||
cd8c93a4 AS |
1274 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1275 | ec_parse_io_ports, ec); | |
1276 | if (ACPI_FAILURE(status)) | |
1277 | return status; | |
837012ed AS |
1278 | |
1279 | /* Get GPE bit assignment (EC events). */ | |
1280 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1281 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1282 | if (ACPI_FAILURE(status)) |
1283 | return status; | |
27663c58 | 1284 | ec->gpe = tmp; |
837012ed | 1285 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1286 | tmp = 0; |
27663c58 MW |
1287 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1288 | ec->global_lock = tmp; | |
837012ed | 1289 | ec->handle = handle; |
cd8c93a4 | 1290 | return AE_CTRL_TERMINATE; |
837012ed AS |
1291 | } |
1292 | ||
5efc5476 BH |
1293 | static int ec_install_handlers(struct acpi_ec *ec) |
1294 | { | |
1295 | acpi_status status; | |
7a73e60e | 1296 | |
ad479e7f | 1297 | acpi_ec_start(ec, false); |
0e1affe4 LZ |
1298 | |
1299 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { | |
1300 | status = acpi_install_address_space_handler(ec->handle, | |
1301 | ACPI_ADR_SPACE_EC, | |
1302 | &acpi_ec_space_handler, | |
1303 | NULL, ec); | |
1304 | if (ACPI_FAILURE(status)) { | |
1305 | if (status == AE_NOT_FOUND) { | |
1306 | /* | |
1307 | * Maybe OS fails in evaluating the _REG | |
1308 | * object. The AE_NOT_FOUND error will be | |
1309 | * ignored and OS * continue to initialize | |
1310 | * EC. | |
1311 | */ | |
1312 | pr_err("Fail in evaluating the _REG object" | |
1313 | " of EC device. Broken bios is suspected.\n"); | |
1314 | } else { | |
1315 | acpi_ec_stop(ec, false); | |
1316 | return -ENODEV; | |
1317 | } | |
1318 | } | |
1319 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1320 | } | |
1321 | ||
1322 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { | |
1323 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, | |
1324 | ACPI_GPE_EDGE_TRIGGERED, | |
1325 | &acpi_ec_gpe_handler, ec); | |
1326 | /* This is not fatal as we can poll EC events */ | |
1327 | if (ACPI_SUCCESS(status)) { | |
1328 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1329 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
1330 | ec->reference_count >= 1) | |
1331 | acpi_ec_enable_gpe(ec, true); | |
5efc5476 BH |
1332 | } |
1333 | } | |
1334 | ||
5efc5476 BH |
1335 | return 0; |
1336 | } | |
1337 | ||
4c611060 AS |
1338 | static void ec_remove_handlers(struct acpi_ec *ec) |
1339 | { | |
0e1affe4 LZ |
1340 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
1341 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
1342 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
1343 | pr_err("failed to remove space handler\n"); | |
1344 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1345 | } | |
1346 | ||
fa5b4a50 LZ |
1347 | /* |
1348 | * Stops handling the EC transactions after removing the operation | |
1349 | * region handler. This is required because _REG(DISCONNECT) | |
1350 | * invoked during the removal can result in new EC transactions. | |
1351 | * | |
1352 | * Flushes the EC requests and thus disables the GPE before | |
1353 | * removing the GPE handler. This is required by the current ACPICA | |
1354 | * GPE core. ACPICA GPE core will automatically disable a GPE when | |
1355 | * it is indicated but there is no way to handle it. So the drivers | |
1356 | * must disable the GPEs prior to removing the GPE handlers. | |
1357 | */ | |
1358 | acpi_ec_stop(ec, false); | |
1359 | ||
0e1affe4 LZ |
1360 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1361 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
1362 | &acpi_ec_gpe_handler))) | |
1363 | pr_err("failed to remove gpe handler\n"); | |
1364 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1365 | } | |
4c611060 AS |
1366 | } |
1367 | ||
fd6231e7 | 1368 | static struct acpi_ec *acpi_ec_alloc(void) |
1da177e4 | 1369 | { |
fd6231e7 | 1370 | struct acpi_ec *ec; |
c0900c35 | 1371 | |
4c611060 | 1372 | /* Check for boot EC */ |
59f0aa94 | 1373 | if (boot_ec) { |
ce52ddf5 AS |
1374 | ec = boot_ec; |
1375 | boot_ec = NULL; | |
59f0aa94 LZ |
1376 | ec_remove_handlers(ec); |
1377 | if (first_ec == ec) | |
1378 | first_ec = NULL; | |
ce52ddf5 AS |
1379 | } else { |
1380 | ec = make_acpi_ec(); | |
a5032bfd | 1381 | } |
fd6231e7 LZ |
1382 | return ec; |
1383 | } | |
1384 | ||
1385 | static int acpi_ec_add(struct acpi_device *device) | |
1386 | { | |
1387 | struct acpi_ec *ec = NULL; | |
1388 | int ret; | |
1389 | ||
1390 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1391 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1392 | ||
1393 | ec = acpi_ec_alloc(); | |
1394 | if (!ec) | |
1395 | return -ENOMEM; | |
a5032bfd AS |
1396 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
1397 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1398 | kfree(ec); |
1399 | return -EINVAL; | |
4c611060 AS |
1400 | } |
1401 | ||
ce52ddf5 AS |
1402 | /* Find and register all query methods */ |
1403 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1404 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1405 | |
4c611060 AS |
1406 | if (!first_ec) |
1407 | first_ec = ec; | |
db89b4f0 | 1408 | device->driver_data = ec; |
de4f1046 | 1409 | |
d6795fe3 AK |
1410 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1411 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1412 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1413 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1414 | |
16a26e85 | 1415 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1416 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1417 | |
1418 | ret = ec_install_handlers(ec); | |
1419 | ||
1c832b3e LT |
1420 | /* Reprobe devices depending on the EC */ |
1421 | acpi_walk_dep_device_list(ec->handle); | |
1422 | ||
5efc5476 | 1423 | /* EC is fully operational, allow queries */ |
37d11391 | 1424 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1425 | |
1426 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1427 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1428 | acpi_ec_clear(ec); |
5efc5476 | 1429 | return ret; |
1da177e4 LT |
1430 | } |
1431 | ||
51fac838 | 1432 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1433 | { |
01f22462 | 1434 | struct acpi_ec *ec; |
1da177e4 | 1435 | |
1da177e4 | 1436 | if (!device) |
d550d98d | 1437 | return -EINVAL; |
1da177e4 LT |
1438 | |
1439 | ec = acpi_driver_data(device); | |
cf745ec7 | 1440 | ec_remove_handlers(ec); |
0700c047 | 1441 | acpi_ec_remove_query_handlers(ec, true, 0); |
de4f1046 TR |
1442 | release_region(ec->data_addr, 1); |
1443 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1444 | device->driver_data = NULL; |
d033879c | 1445 | if (ec == first_ec) |
c0900c35 | 1446 | first_ec = NULL; |
4c611060 | 1447 | kfree(ec); |
d550d98d | 1448 | return 0; |
1da177e4 LT |
1449 | } |
1450 | ||
1da177e4 | 1451 | static acpi_status |
c0900c35 | 1452 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1453 | { |
3d02b90b | 1454 | struct acpi_ec *ec = context; |
1da177e4 | 1455 | |
01f22462 | 1456 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1457 | return AE_OK; |
1da177e4 LT |
1458 | |
1459 | /* | |
1460 | * The first address region returned is the data port, and | |
1461 | * the second address region returned is the status/command | |
1462 | * port. | |
1463 | */ | |
de4f1046 | 1464 | if (ec->data_addr == 0) |
6ffb221a | 1465 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1466 | else if (ec->command_addr == 0) |
6ffb221a | 1467 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1468 | else |
1da177e4 | 1469 | return AE_CTRL_TERMINATE; |
1da177e4 | 1470 | |
1da177e4 LT |
1471 | return AE_OK; |
1472 | } | |
1473 | ||
dcf15cbd LZ |
1474 | static const struct acpi_device_id ec_device_ids[] = { |
1475 | {"PNP0C09", 0}, | |
1476 | {"", 0}, | |
1477 | }; | |
1478 | ||
1479 | int __init acpi_ec_dsdt_probe(void) | |
c04209a7 | 1480 | { |
dcf15cbd | 1481 | acpi_status status; |
fd6231e7 LZ |
1482 | struct acpi_ec *ec; |
1483 | int ret; | |
dcf15cbd | 1484 | |
fd6231e7 LZ |
1485 | ec = acpi_ec_alloc(); |
1486 | if (!ec) | |
1487 | return -ENOMEM; | |
dcf15cbd LZ |
1488 | /* |
1489 | * Finding EC from DSDT if there is no ECDT EC available. When this | |
1490 | * function is invoked, ACPI tables have been fully loaded, we can | |
1491 | * walk namespace now. | |
1492 | */ | |
dcf15cbd | 1493 | status = acpi_get_devices(ec_device_ids[0].id, |
fd6231e7 LZ |
1494 | ec_parse_device, ec, NULL); |
1495 | if (ACPI_FAILURE(status) || !ec->handle) { | |
1496 | ret = -ENODEV; | |
1497 | goto error; | |
c04209a7 | 1498 | } |
fd6231e7 LZ |
1499 | ret = ec_install_handlers(ec); |
1500 | ||
1501 | error: | |
1502 | if (ret) | |
1503 | kfree(ec); | |
1504 | else | |
1505 | first_ec = boot_ec = ec; | |
1506 | return ret; | |
c04209a7 AS |
1507 | } |
1508 | ||
3cb02aeb | 1509 | #if 0 |
79149001 | 1510 | /* |
3cb02aeb LZ |
1511 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
1512 | * set, for which case, we complete the QR_EC without issuing it to the | |
1513 | * firmware. | |
1514 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 | |
1515 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 | |
79149001 LZ |
1516 | */ |
1517 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1518 | { | |
1519 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1520 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1521 | return 0; | |
1522 | } | |
3cb02aeb | 1523 | #endif |
79149001 | 1524 | |
ad332c8a KC |
1525 | /* |
1526 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1527 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1528 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1529 | * | |
1530 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1531 | * | |
1532 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1533 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1534 | * behaviour is not known at this time. | |
1535 | * | |
1536 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1537 | * however it is very likely that other Samsung models are affected. | |
1538 | * | |
1539 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1540 | * should be harmless. | |
1541 | */ | |
1542 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1543 | { | |
1544 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1545 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
3cb02aeb | 1546 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
ad332c8a KC |
1547 | return 0; |
1548 | } | |
1549 | ||
bc539567 LZ |
1550 | /* |
1551 | * Some ECDTs contain wrong register addresses. | |
1552 | * MSI MS-171F | |
1553 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1554 | */ | |
59f0aa94 LZ |
1555 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
1556 | { | |
1557 | pr_debug("Detected system needing ECDT address correction.\n"); | |
1558 | EC_FLAGS_CORRECT_ECDT = 1; | |
1559 | return 0; | |
1560 | } | |
1561 | ||
6cef7497 | 1562 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
0adf3c74 | 1563 | { |
59f0aa94 | 1564 | ec_correct_ecdt, "MSI MS-171F", { |
3174abcf LZ |
1565 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
1566 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, | |
777cb382 | 1567 | { |
ad332c8a KC |
1568 | ec_clear_on_resume, "Samsung hardware", { |
1569 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1570 | {}, |
1571 | }; | |
1572 | ||
c0900c35 AS |
1573 | int __init acpi_ec_ecdt_probe(void) |
1574 | { | |
fd6231e7 | 1575 | int ret; |
c0900c35 | 1576 | acpi_status status; |
50526df6 | 1577 | struct acpi_table_ecdt *ecdt_ptr; |
fd6231e7 | 1578 | struct acpi_ec *ec; |
45bea155 | 1579 | |
fd6231e7 LZ |
1580 | ec = acpi_ec_alloc(); |
1581 | if (!ec) | |
c0900c35 AS |
1582 | return -ENOMEM; |
1583 | /* | |
1584 | * Generate a boot ec context | |
1585 | */ | |
0adf3c74 | 1586 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1587 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1588 | (struct acpi_table_header **)&ecdt_ptr); | |
59f0aa94 LZ |
1589 | if (ACPI_FAILURE(status)) { |
1590 | ret = -ENODEV; | |
1591 | goto error; | |
cd8c93a4 | 1592 | } |
0adf3c74 | 1593 | |
59f0aa94 LZ |
1594 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
1595 | /* | |
1596 | * Asus X50GL: | |
1597 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 | |
1598 | */ | |
1599 | ret = -ENODEV; | |
1600 | goto error; | |
ed4b197d | 1601 | } |
478fa03b | 1602 | |
59f0aa94 LZ |
1603 | pr_info("EC description table is found, configuring boot EC\n"); |
1604 | if (EC_FLAGS_CORRECT_ECDT) { | |
fd6231e7 LZ |
1605 | ec->command_addr = ecdt_ptr->data.address; |
1606 | ec->data_addr = ecdt_ptr->control.address; | |
c6cb0e87 | 1607 | } else { |
fd6231e7 LZ |
1608 | ec->command_addr = ecdt_ptr->control.address; |
1609 | ec->data_addr = ecdt_ptr->data.address; | |
c6cb0e87 | 1610 | } |
fd6231e7 LZ |
1611 | ec->gpe = ecdt_ptr->gpe; |
1612 | ec->handle = ACPI_ROOT_OBJECT; | |
1613 | ret = ec_install_handlers(ec); | |
c5279dee | 1614 | error: |
fd6231e7 LZ |
1615 | if (ret) |
1616 | kfree(ec); | |
1617 | else | |
1618 | first_ec = boot_ec = ec; | |
59f0aa94 | 1619 | return ret; |
1da177e4 LT |
1620 | } |
1621 | ||
1d68d261 LZ |
1622 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
1623 | { | |
1624 | int result = 0; | |
1625 | ||
1626 | if (!strncmp(val, "status", sizeof("status") - 1)) { | |
1627 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
1628 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); | |
1629 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { | |
1630 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; | |
1631 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); | |
1632 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { | |
1633 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; | |
1634 | pr_info("Assuming SCI_EVT clearing on event reads\n"); | |
1635 | } else | |
1636 | result = -EINVAL; | |
1637 | return result; | |
1638 | } | |
1639 | ||
1640 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) | |
1641 | { | |
1642 | switch (ec_event_clearing) { | |
1643 | case ACPI_EC_EVT_TIMING_STATUS: | |
1644 | return sprintf(buffer, "status"); | |
1645 | case ACPI_EC_EVT_TIMING_QUERY: | |
1646 | return sprintf(buffer, "query"); | |
1647 | case ACPI_EC_EVT_TIMING_EVENT: | |
1648 | return sprintf(buffer, "event"); | |
1649 | default: | |
1650 | return sprintf(buffer, "invalid"); | |
1651 | } | |
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, | |
1656 | NULL, 0644); | |
1657 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); | |
1658 | ||
223883b7 AS |
1659 | static struct acpi_driver acpi_ec_driver = { |
1660 | .name = "ec", | |
1661 | .class = ACPI_EC_CLASS, | |
1662 | .ids = ec_device_ids, | |
1663 | .ops = { | |
1664 | .add = acpi_ec_add, | |
1665 | .remove = acpi_ec_remove, | |
223883b7 AS |
1666 | }, |
1667 | }; | |
1668 | ||
e1191bd4 LZ |
1669 | static inline int acpi_ec_query_init(void) |
1670 | { | |
1671 | if (!ec_query_wq) { | |
1672 | ec_query_wq = alloc_workqueue("kec_query", 0, | |
1673 | ec_max_queries); | |
1674 | if (!ec_query_wq) | |
1675 | return -ENODEV; | |
1676 | } | |
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | static inline void acpi_ec_query_exit(void) | |
1681 | { | |
1682 | if (ec_query_wq) { | |
1683 | destroy_workqueue(ec_query_wq); | |
1684 | ec_query_wq = NULL; | |
1685 | } | |
1686 | } | |
1687 | ||
a5f820fe | 1688 | int __init acpi_ec_init(void) |
1da177e4 | 1689 | { |
e1191bd4 | 1690 | int result; |
1da177e4 | 1691 | |
e1191bd4 LZ |
1692 | /* register workqueue for _Qxx evaluations */ |
1693 | result = acpi_ec_query_init(); | |
1694 | if (result) | |
1695 | goto err_exit; | |
1da177e4 LT |
1696 | /* Now register the driver for the EC */ |
1697 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
e1191bd4 LZ |
1698 | if (result) |
1699 | goto err_exit; | |
1da177e4 | 1700 | |
e1191bd4 LZ |
1701 | err_exit: |
1702 | if (result) | |
1703 | acpi_ec_query_exit(); | |
d550d98d | 1704 | return result; |
1da177e4 LT |
1705 | } |
1706 | ||
1da177e4 LT |
1707 | /* EC driver currently not unloadable */ |
1708 | #if 0 | |
50526df6 | 1709 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1710 | { |
1da177e4 LT |
1711 | |
1712 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
e1191bd4 | 1713 | acpi_ec_query_exit(); |
1da177e4 | 1714 | } |
7843932a | 1715 | #endif /* 0 */ |