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 { |
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 */ | |
ad479e7f LZ |
112 | EC_FLAGS_STARTED, /* Driver is started */ |
113 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
114 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
115 | * current command processing */ | |
1da177e4 | 116 | }; |
6ffb221a | 117 | |
f92fca00 LZ |
118 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
119 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
120 | ||
7a18e96d TR |
121 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
122 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
123 | module_param(ec_delay, uint, 0644); | |
124 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
125 | ||
e1191bd4 LZ |
126 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
127 | module_param(ec_max_queries, uint, 0644); | |
128 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); | |
129 | ||
15de603b LZ |
130 | static bool ec_busy_polling __read_mostly; |
131 | module_param(ec_busy_polling, bool, 0644); | |
132 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); | |
133 | ||
134 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; | |
135 | module_param(ec_polling_guard, uint, 0644); | |
136 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); | |
137 | ||
3cb02aeb | 138 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
1d68d261 | 139 | |
a520d52e FT |
140 | /* |
141 | * If the number of false interrupts per one transaction exceeds | |
142 | * this threshold, will think there is a GPE storm happened and | |
143 | * will disable the GPE for normal transaction. | |
144 | */ | |
145 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
146 | module_param(ec_storm_threshold, uint, 0644); | |
147 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
148 | ||
d3028305 | 149 | static bool ec_freeze_events __read_mostly = true; |
39a2a2aa LZ |
150 | module_param(ec_freeze_events, bool, 0644); |
151 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); | |
152 | ||
837012ed AS |
153 | struct acpi_ec_query_handler { |
154 | struct list_head node; | |
155 | acpi_ec_query_func func; | |
156 | acpi_handle handle; | |
157 | void *data; | |
158 | u8 query_bit; | |
01305d41 | 159 | struct kref kref; |
837012ed AS |
160 | }; |
161 | ||
8463200a | 162 | struct transaction { |
7c6db4e0 AS |
163 | const u8 *wdata; |
164 | u8 *rdata; | |
165 | unsigned short irq_count; | |
8463200a | 166 | u8 command; |
a2f93aea AS |
167 | u8 wi; |
168 | u8 ri; | |
7c6db4e0 AS |
169 | u8 wlen; |
170 | u8 rlen; | |
f92fca00 | 171 | u8 flags; |
7c6db4e0 AS |
172 | }; |
173 | ||
02b771b6 LZ |
174 | struct acpi_ec_query { |
175 | struct transaction transaction; | |
176 | struct work_struct work; | |
177 | struct acpi_ec_query_handler *handler; | |
178 | }; | |
179 | ||
550b3aac | 180 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 181 | static void advance_transaction(struct acpi_ec *ec); |
02b771b6 LZ |
182 | static void acpi_ec_event_handler(struct work_struct *work); |
183 | static void acpi_ec_event_processor(struct work_struct *work); | |
74443bbe | 184 | |
1195a098 TR |
185 | struct acpi_ec *boot_ec, *first_ec; |
186 | EXPORT_SYMBOL(first_ec); | |
e1191bd4 | 187 | static struct workqueue_struct *ec_query_wq; |
703959d4 | 188 | |
ad332c8a | 189 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 190 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
59f0aa94 | 191 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
5423a0cb | 192 | |
3535a3c1 LZ |
193 | /* -------------------------------------------------------------------------- |
194 | * Logging/Debugging | |
195 | * -------------------------------------------------------------------------- */ | |
196 | ||
197 | /* | |
198 | * Splitters used by the developers to track the boundary of the EC | |
199 | * handling processes. | |
200 | */ | |
201 | #ifdef DEBUG | |
202 | #define EC_DBG_SEP " " | |
203 | #define EC_DBG_DRV "+++++" | |
204 | #define EC_DBG_STM "=====" | |
205 | #define EC_DBG_REQ "*****" | |
206 | #define EC_DBG_EVT "#####" | |
207 | #else | |
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 | #endif | |
214 | ||
215 | #define ec_log_raw(fmt, ...) \ | |
216 | pr_info(fmt "\n", ##__VA_ARGS__) | |
217 | #define ec_dbg_raw(fmt, ...) \ | |
218 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
219 | #define ec_log(filter, fmt, ...) \ | |
220 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
221 | #define ec_dbg(filter, fmt, ...) \ | |
222 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
223 | ||
224 | #define ec_log_drv(fmt, ...) \ | |
225 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
226 | #define ec_dbg_drv(fmt, ...) \ | |
227 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
228 | #define ec_dbg_stm(fmt, ...) \ | |
229 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
230 | #define ec_dbg_req(fmt, ...) \ | |
231 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
232 | #define ec_dbg_evt(fmt, ...) \ | |
233 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
234 | #define ec_dbg_ref(ec, fmt, ...) \ |
235 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 236 | |
ad479e7f LZ |
237 | /* -------------------------------------------------------------------------- |
238 | * Device Flags | |
239 | * -------------------------------------------------------------------------- */ | |
240 | ||
241 | static bool acpi_ec_started(struct acpi_ec *ec) | |
242 | { | |
243 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
244 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
245 | } | |
246 | ||
750f628b LZ |
247 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
248 | { | |
249 | /* | |
250 | * There is an OSPM early stage logic. During the early stages | |
251 | * (boot/resume), OSPMs shouldn't enable the event handling, only | |
252 | * the EC transactions are allowed to be performed. | |
253 | */ | |
254 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
255 | return false; | |
256 | /* | |
39a2a2aa LZ |
257 | * However, disabling the event handling is experimental for late |
258 | * stage (suspend), and is controlled by the boot parameter of | |
259 | * "ec_freeze_events": | |
260 | * 1. true: The EC event handling is disabled before entering | |
261 | * the noirq stage. | |
262 | * 2. false: The EC event handling is automatically disabled as | |
263 | * soon as the EC driver is stopped. | |
750f628b | 264 | */ |
39a2a2aa LZ |
265 | if (ec_freeze_events) |
266 | return acpi_ec_started(ec); | |
267 | else | |
268 | return test_bit(EC_FLAGS_STARTED, &ec->flags); | |
750f628b LZ |
269 | } |
270 | ||
9887d22a LZ |
271 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
272 | { | |
273 | return ec->reference_count == 1; | |
274 | } | |
275 | ||
1da177e4 | 276 | /* -------------------------------------------------------------------------- |
ca37bfdf | 277 | * EC Registers |
7a73e60e | 278 | * -------------------------------------------------------------------------- */ |
1da177e4 | 279 | |
6ffb221a | 280 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 281 | { |
3ebe08a7 | 282 | u8 x = inb(ec->command_addr); |
7a73e60e | 283 | |
3535a3c1 LZ |
284 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
285 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
286 | x, | |
287 | !!(x & ACPI_EC_FLAG_SCI), | |
288 | !!(x & ACPI_EC_FLAG_BURST), | |
289 | !!(x & ACPI_EC_FLAG_CMD), | |
290 | !!(x & ACPI_EC_FLAG_IBF), | |
291 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 292 | return x; |
451566f4 DT |
293 | } |
294 | ||
6ffb221a | 295 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 296 | { |
3ebe08a7 | 297 | u8 x = inb(ec->data_addr); |
7a73e60e | 298 | |
d8d031a6 | 299 | ec->timestamp = jiffies; |
3535a3c1 | 300 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 301 | return x; |
7c6db5e5 DS |
302 | } |
303 | ||
6ffb221a | 304 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 305 | { |
3535a3c1 | 306 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 307 | outb(command, ec->command_addr); |
d8d031a6 | 308 | ec->timestamp = jiffies; |
45bea155 LY |
309 | } |
310 | ||
6ffb221a | 311 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 312 | { |
3535a3c1 | 313 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 314 | outb(data, ec->data_addr); |
d8d031a6 | 315 | ec->timestamp = jiffies; |
703959d4 | 316 | } |
45bea155 | 317 | |
e34c0e2b LZ |
318 | #ifdef DEBUG |
319 | static const char *acpi_ec_cmd_string(u8 cmd) | |
320 | { | |
321 | switch (cmd) { | |
322 | case 0x80: | |
323 | return "RD_EC"; | |
324 | case 0x81: | |
325 | return "WR_EC"; | |
326 | case 0x82: | |
327 | return "BE_EC"; | |
328 | case 0x83: | |
329 | return "BD_EC"; | |
330 | case 0x84: | |
331 | return "QR_EC"; | |
332 | } | |
333 | return "UNKNOWN"; | |
334 | } | |
335 | #else | |
336 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
337 | #endif | |
338 | ||
ca37bfdf LZ |
339 | /* -------------------------------------------------------------------------- |
340 | * GPE Registers | |
341 | * -------------------------------------------------------------------------- */ | |
342 | ||
343 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
344 | { | |
345 | acpi_event_status gpe_status = 0; | |
346 | ||
347 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 348 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
349 | } |
350 | ||
351 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
352 | { | |
353 | if (open) | |
354 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
355 | else { |
356 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 357 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 358 | } |
ca37bfdf LZ |
359 | if (acpi_ec_is_gpe_raised(ec)) { |
360 | /* | |
361 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
362 | * software need to manually trigger a pseudo GPE event on | |
363 | * EN=1 writes. | |
364 | */ | |
3535a3c1 | 365 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
366 | advance_transaction(ec); |
367 | } | |
368 | } | |
369 | ||
370 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
371 | { | |
372 | if (close) | |
373 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
374 | else { |
375 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 376 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 377 | } |
ca37bfdf LZ |
378 | } |
379 | ||
380 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
381 | { | |
382 | /* | |
383 | * GPE STS is a W1C register, which means: | |
384 | * 1. Software can clear it without worrying about clearing other | |
385 | * GPEs' STS bits when the hardware sets them in parallel. | |
386 | * 2. As long as software can ensure only clearing it when it is | |
387 | * set, hardware won't set it in parallel. | |
388 | * So software can clear GPE in any contexts. | |
389 | * Warning: do not move the check into advance_transaction() as the | |
390 | * EC commands will be sent without GPE raised. | |
391 | */ | |
392 | if (!acpi_ec_is_gpe_raised(ec)) | |
393 | return; | |
394 | acpi_clear_gpe(NULL, ec->gpe); | |
395 | } | |
396 | ||
397 | /* -------------------------------------------------------------------------- | |
398 | * Transaction Management | |
399 | * -------------------------------------------------------------------------- */ | |
400 | ||
9887d22a LZ |
401 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
402 | { | |
403 | ec->reference_count++; | |
0e1affe4 LZ |
404 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
405 | ec->reference_count == 1) | |
9887d22a LZ |
406 | acpi_ec_enable_gpe(ec, true); |
407 | } | |
408 | ||
409 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
410 | { | |
411 | bool flushed = false; | |
412 | ||
413 | ec->reference_count--; | |
0e1affe4 LZ |
414 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
415 | ec->reference_count == 0) | |
9887d22a LZ |
416 | acpi_ec_disable_gpe(ec, true); |
417 | flushed = acpi_ec_flushed(ec); | |
418 | if (flushed) | |
419 | wake_up(&ec->wait); | |
420 | } | |
421 | ||
e1d4d90f LZ |
422 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
423 | { | |
424 | if (!test_bit(flag, &ec->flags)) { | |
425 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 426 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
427 | set_bit(flag, &ec->flags); |
428 | } | |
429 | } | |
430 | ||
431 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
432 | { | |
433 | if (test_bit(flag, &ec->flags)) { | |
434 | clear_bit(flag, &ec->flags); | |
435 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 436 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
437 | } |
438 | } | |
439 | ||
9887d22a LZ |
440 | /* |
441 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
442 | * the flush operation is not in | |
443 | * progress | |
444 | * @ec: the EC device | |
445 | * | |
446 | * This function must be used before taking a new action that should hold | |
447 | * the reference count. If this function returns false, then the action | |
448 | * must be discarded or it will prevent the flush operation from being | |
449 | * completed. | |
450 | */ | |
37d11391 | 451 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 452 | { |
37d11391 RW |
453 | if (!acpi_ec_started(ec)) |
454 | return false; | |
9887d22a LZ |
455 | acpi_ec_submit_request(ec); |
456 | return true; | |
457 | } | |
458 | ||
37d11391 | 459 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 460 | { |
750f628b LZ |
461 | if (acpi_ec_event_enabled(ec) && |
462 | !test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
9d8993be LZ |
463 | ec_dbg_evt("Command(%s) submitted/blocked", |
464 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
465 | ec->nr_pending_queries++; | |
74443bbe LZ |
466 | schedule_work(&ec->work); |
467 | } | |
468 | } | |
469 | ||
37d11391 | 470 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe | 471 | { |
f8b8eb71 | 472 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
37d11391 | 473 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
9d8993be LZ |
474 | ec_dbg_evt("Command(%s) unblocked", |
475 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
74443bbe LZ |
476 | } |
477 | } | |
478 | ||
750f628b LZ |
479 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
480 | { | |
481 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
482 | ec_log_drv("event unblocked"); | |
e923e8e7 LZ |
483 | if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
484 | advance_transaction(ec); | |
750f628b LZ |
485 | } |
486 | ||
487 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) | |
488 | { | |
489 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) | |
490 | ec_log_drv("event blocked"); | |
491 | } | |
492 | ||
493 | /* | |
494 | * Process _Q events that might have accumulated in the EC. | |
495 | * Run with locked ec mutex. | |
496 | */ | |
497 | static void acpi_ec_clear(struct acpi_ec *ec) | |
498 | { | |
499 | int i, status; | |
500 | u8 value = 0; | |
501 | ||
502 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
503 | status = acpi_ec_query(ec, &value); | |
504 | if (status || !value) | |
505 | break; | |
506 | } | |
507 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
508 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
509 | else | |
510 | pr_info("%d stale EC events cleared\n", i); | |
511 | } | |
512 | ||
513 | static void acpi_ec_enable_event(struct acpi_ec *ec) | |
514 | { | |
515 | unsigned long flags; | |
516 | ||
517 | spin_lock_irqsave(&ec->lock, flags); | |
518 | if (acpi_ec_started(ec)) | |
519 | __acpi_ec_enable_event(ec); | |
520 | spin_unlock_irqrestore(&ec->lock, flags); | |
521 | ||
522 | /* Drain additional events if hardware requires that */ | |
523 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
524 | acpi_ec_clear(ec); | |
525 | } | |
526 | ||
39a2a2aa LZ |
527 | static bool acpi_ec_query_flushed(struct acpi_ec *ec) |
528 | { | |
529 | bool flushed; | |
530 | unsigned long flags; | |
531 | ||
532 | spin_lock_irqsave(&ec->lock, flags); | |
533 | flushed = !ec->nr_pending_queries; | |
534 | spin_unlock_irqrestore(&ec->lock, flags); | |
535 | return flushed; | |
536 | } | |
537 | ||
538 | static void __acpi_ec_flush_event(struct acpi_ec *ec) | |
539 | { | |
540 | /* | |
541 | * When ec_freeze_events is true, we need to flush events in | |
542 | * the proper position before entering the noirq stage. | |
543 | */ | |
544 | wait_event(ec->wait, acpi_ec_query_flushed(ec)); | |
545 | if (ec_query_wq) | |
546 | flush_workqueue(ec_query_wq); | |
547 | } | |
548 | ||
549 | static void acpi_ec_disable_event(struct acpi_ec *ec) | |
550 | { | |
551 | unsigned long flags; | |
552 | ||
553 | spin_lock_irqsave(&ec->lock, flags); | |
554 | __acpi_ec_disable_event(ec); | |
555 | spin_unlock_irqrestore(&ec->lock, flags); | |
556 | __acpi_ec_flush_event(ec); | |
557 | } | |
558 | ||
1d68d261 LZ |
559 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
560 | { | |
61197547 LZ |
561 | bool guarded = true; |
562 | unsigned long flags; | |
563 | ||
564 | spin_lock_irqsave(&ec->lock, flags); | |
565 | /* | |
566 | * If firmware SCI_EVT clearing timing is "event", we actually | |
567 | * don't know when the SCI_EVT will be cleared by firmware after | |
568 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an | |
569 | * acceptable period. | |
570 | * | |
571 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is | |
572 | * flagged, which means SCI_EVT check has just been performed. | |
573 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the | |
574 | * guarding should have already been performed (via | |
575 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the | |
576 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into | |
577 | * ACPI_EC_COMMAND_POLL state immediately. | |
578 | */ | |
1d68d261 LZ |
579 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
580 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || | |
581 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || | |
582 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) | |
61197547 LZ |
583 | guarded = false; |
584 | spin_unlock_irqrestore(&ec->lock, flags); | |
585 | return guarded; | |
1d68d261 LZ |
586 | } |
587 | ||
d8d031a6 LZ |
588 | static int ec_transaction_polled(struct acpi_ec *ec) |
589 | { | |
590 | unsigned long flags; | |
591 | int ret = 0; | |
592 | ||
593 | spin_lock_irqsave(&ec->lock, flags); | |
594 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
595 | ret = 1; | |
596 | spin_unlock_irqrestore(&ec->lock, flags); | |
597 | return ret; | |
598 | } | |
599 | ||
f92fca00 | 600 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 601 | { |
7c6db4e0 AS |
602 | unsigned long flags; |
603 | int ret = 0; | |
7a73e60e | 604 | |
f351d027 | 605 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 606 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 607 | ret = 1; |
f351d027 | 608 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 609 | return ret; |
45bea155 | 610 | } |
451566f4 | 611 | |
f8b8eb71 LZ |
612 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
613 | { | |
614 | ec->curr->flags |= flag; | |
615 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
1d68d261 LZ |
616 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
617 | flag == ACPI_EC_COMMAND_POLL) | |
618 | acpi_ec_complete_query(ec); | |
619 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && | |
620 | flag == ACPI_EC_COMMAND_COMPLETE) | |
f8b8eb71 | 621 | acpi_ec_complete_query(ec); |
1d68d261 LZ |
622 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
623 | flag == ACPI_EC_COMMAND_COMPLETE) | |
624 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); | |
f8b8eb71 LZ |
625 | } |
626 | } | |
627 | ||
0c78808f | 628 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 629 | { |
36b15875 | 630 | struct transaction *t; |
66b42b78 | 631 | u8 status; |
c0d65341 | 632 | bool wakeup = false; |
b76b51ba | 633 | |
3535a3c1 LZ |
634 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
635 | smp_processor_id()); | |
ca37bfdf LZ |
636 | /* |
637 | * By always clearing STS before handling all indications, we can | |
638 | * ensure a hardware STS 0->1 change after this clearing can always | |
639 | * trigger a GPE interrupt. | |
640 | */ | |
641 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 642 | status = acpi_ec_read_status(ec); |
36b15875 | 643 | t = ec->curr; |
1d68d261 LZ |
644 | /* |
645 | * Another IRQ or a guarded polling mode advancement is detected, | |
646 | * the next QR_EC submission is then allowed. | |
647 | */ | |
648 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { | |
649 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && | |
66db3834 LZ |
650 | (!ec->nr_pending_queries || |
651 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { | |
1d68d261 LZ |
652 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
653 | acpi_ec_complete_query(ec); | |
654 | } | |
655 | } | |
b76b51ba | 656 | if (!t) |
f92fca00 LZ |
657 | goto err; |
658 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
659 | if (t->wlen > t->wi) { | |
660 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
661 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
662 | else | |
663 | goto err; | |
664 | } else if (t->rlen > t->ri) { | |
665 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
666 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 667 | if (t->rlen == t->ri) { |
f8b8eb71 | 668 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
3afcf2ec | 669 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
670 | ec_dbg_evt("Command(%s) completed by hardware", |
671 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 LZ |
672 | wakeup = true; |
673 | } | |
f92fca00 LZ |
674 | } else |
675 | goto err; | |
676 | } else if (t->wlen == t->wi && | |
c0d65341 | 677 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f8b8eb71 | 678 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
679 | wakeup = true; |
680 | } | |
0c78808f | 681 | goto out; |
f92fca00 | 682 | } else { |
79149001 LZ |
683 | if (EC_FLAGS_QUERY_HANDSHAKE && |
684 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec | 685 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
f8b8eb71 | 686 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
3afcf2ec | 687 | t->rdata[t->ri++] = 0x00; |
f8b8eb71 | 688 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
9d8993be LZ |
689 | ec_dbg_evt("Command(%s) completed by software", |
690 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
3afcf2ec LZ |
691 | wakeup = true; |
692 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 | 693 | acpi_ec_write_cmd(ec, t->command); |
f8b8eb71 | 694 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
7c6db4e0 | 695 | } else |
dd15f8c4 | 696 | goto err; |
0c78808f | 697 | goto out; |
f92fca00 | 698 | } |
dd15f8c4 | 699 | err: |
a3cd8d27 FT |
700 | /* |
701 | * If SCI bit is set, then don't think it's a false IRQ | |
702 | * otherwise will take a not handled IRQ as a false one. | |
703 | */ | |
f92fca00 | 704 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
705 | if (in_interrupt() && t) { |
706 | if (t->irq_count < ec_storm_threshold) | |
707 | ++t->irq_count; | |
708 | /* Allow triggering on 0 threshold */ | |
709 | if (t->irq_count == ec_storm_threshold) | |
710 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
711 | } | |
f92fca00 | 712 | } |
0c78808f | 713 | out: |
74443bbe | 714 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 715 | acpi_ec_submit_query(ec); |
0c78808f LZ |
716 | if (wakeup && in_interrupt()) |
717 | wake_up(&ec->wait); | |
f92fca00 | 718 | } |
a3cd8d27 | 719 | |
f92fca00 LZ |
720 | static void start_transaction(struct acpi_ec *ec) |
721 | { | |
722 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
723 | ec->curr->flags = 0; | |
d8d031a6 LZ |
724 | } |
725 | ||
726 | static int ec_guard(struct acpi_ec *ec) | |
727 | { | |
15de603b | 728 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
d8d031a6 LZ |
729 | unsigned long timeout = ec->timestamp + guard; |
730 | ||
61197547 | 731 | /* Ensure guarding period before polling EC status */ |
d8d031a6 | 732 | do { |
15de603b | 733 | if (ec_busy_polling) { |
d8d031a6 LZ |
734 | /* Perform busy polling */ |
735 | if (ec_transaction_completed(ec)) | |
736 | return 0; | |
737 | udelay(jiffies_to_usecs(guard)); | |
738 | } else { | |
739 | /* | |
740 | * Perform wait polling | |
61197547 LZ |
741 | * 1. Wait the transaction to be completed by the |
742 | * GPE handler after the transaction enters | |
743 | * ACPI_EC_COMMAND_POLL state. | |
744 | * 2. A special guarding logic is also required | |
745 | * for event clearing mode "event" before the | |
746 | * transaction enters ACPI_EC_COMMAND_POLL | |
747 | * state. | |
d8d031a6 | 748 | */ |
1d68d261 LZ |
749 | if (!ec_transaction_polled(ec) && |
750 | !acpi_ec_guard_event(ec)) | |
d8d031a6 LZ |
751 | break; |
752 | if (wait_event_timeout(ec->wait, | |
753 | ec_transaction_completed(ec), | |
754 | guard)) | |
755 | return 0; | |
756 | } | |
d8d031a6 LZ |
757 | } while (time_before(jiffies, timeout)); |
758 | return -ETIME; | |
845625cd | 759 | } |
03d1d99c | 760 | |
7c6db4e0 AS |
761 | static int ec_poll(struct acpi_ec *ec) |
762 | { | |
2a84cb98 | 763 | unsigned long flags; |
28fe5c82 | 764 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 765 | |
2a84cb98 AS |
766 | while (repeat--) { |
767 | unsigned long delay = jiffies + | |
7a18e96d | 768 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 769 | do { |
d8d031a6 LZ |
770 | if (!ec_guard(ec)) |
771 | return 0; | |
f92fca00 | 772 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 773 | advance_transaction(ec); |
f92fca00 | 774 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 775 | } while (time_before(jiffies, delay)); |
16a26e85 | 776 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 777 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 778 | start_transaction(ec); |
f351d027 | 779 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 780 | } |
b77d81b2 | 781 | return -ETIME; |
1da177e4 LT |
782 | } |
783 | ||
8463200a | 784 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 785 | struct transaction *t) |
45bea155 | 786 | { |
7c6db4e0 | 787 | unsigned long tmp; |
7c6db4e0 | 788 | int ret = 0; |
7a73e60e | 789 | |
7c6db4e0 | 790 | /* start transaction */ |
f351d027 | 791 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 792 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 793 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
794 | ret = -EINVAL; |
795 | goto unlock; | |
796 | } | |
770970f0 | 797 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 798 | /* following two actions should be kept atomic */ |
8463200a | 799 | ec->curr = t; |
3535a3c1 | 800 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 801 | start_transaction(ec); |
df9ff918 | 802 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 803 | |
df9ff918 | 804 | ret = ec_poll(ec); |
d8d031a6 | 805 | |
df9ff918 | 806 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
807 | if (t->irq_count == ec_storm_threshold) |
808 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 809 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 810 | ec->curr = NULL; |
9887d22a LZ |
811 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
812 | acpi_ec_complete_request(ec); | |
770970f0 | 813 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 814 | unlock: |
f351d027 | 815 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
816 | return ret; |
817 | } | |
818 | ||
2a84cb98 | 819 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 820 | { |
d7a76e4c | 821 | int status; |
50526df6 | 822 | u32 glk; |
7a73e60e | 823 | |
8463200a | 824 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 825 | return -EINVAL; |
8463200a AS |
826 | if (t->rdata) |
827 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 828 | |
f351d027 | 829 | mutex_lock(&ec->mutex); |
703959d4 | 830 | if (ec->global_lock) { |
1da177e4 | 831 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 832 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
833 | status = -ENODEV; |
834 | goto unlock; | |
c24e912b | 835 | } |
1da177e4 | 836 | } |
a62e8f19 | 837 | |
2a84cb98 | 838 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 839 | |
703959d4 | 840 | if (ec->global_lock) |
1da177e4 | 841 | acpi_release_global_lock(glk); |
7c6db4e0 | 842 | unlock: |
f351d027 | 843 | mutex_unlock(&ec->mutex); |
d550d98d | 844 | return status; |
1da177e4 LT |
845 | } |
846 | ||
8a383ef0 | 847 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
848 | { |
849 | u8 d; | |
8463200a AS |
850 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
851 | .wdata = NULL, .rdata = &d, | |
852 | .wlen = 0, .rlen = 1}; | |
853 | ||
2a84cb98 | 854 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
855 | } |
856 | ||
8a383ef0 | 857 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 858 | { |
8463200a AS |
859 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
860 | .wdata = NULL, .rdata = NULL, | |
861 | .wlen = 0, .rlen = 0}; | |
862 | ||
7c6db4e0 | 863 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 864 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
865 | } |
866 | ||
7a73e60e | 867 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
868 | { |
869 | int result; | |
870 | u8 d; | |
8463200a AS |
871 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
872 | .wdata = &address, .rdata = &d, | |
873 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 874 | |
2a84cb98 | 875 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
876 | *data = d; |
877 | return result; | |
878 | } | |
6ffb221a | 879 | |
3576cf61 DS |
880 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
881 | { | |
6ccedb10 | 882 | u8 wdata[2] = { address, data }; |
8463200a AS |
883 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
884 | .wdata = wdata, .rdata = NULL, | |
885 | .wlen = 2, .rlen = 0}; | |
886 | ||
2a84cb98 | 887 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
888 | } |
889 | ||
b76b51ba | 890 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 891 | { |
1da177e4 | 892 | int err; |
6ffb221a | 893 | u8 temp_data; |
1da177e4 LT |
894 | |
895 | if (!first_ec) | |
896 | return -ENODEV; | |
897 | ||
d033879c | 898 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
899 | |
900 | if (!err) { | |
901 | *val = temp_data; | |
902 | return 0; | |
7a73e60e LZ |
903 | } |
904 | return err; | |
1da177e4 LT |
905 | } |
906 | EXPORT_SYMBOL(ec_read); | |
907 | ||
50526df6 | 908 | int ec_write(u8 addr, u8 val) |
1da177e4 | 909 | { |
1da177e4 LT |
910 | int err; |
911 | ||
912 | if (!first_ec) | |
913 | return -ENODEV; | |
914 | ||
d033879c | 915 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
916 | |
917 | return err; | |
918 | } | |
919 | EXPORT_SYMBOL(ec_write); | |
920 | ||
616362de | 921 | int ec_transaction(u8 command, |
7a73e60e LZ |
922 | const u8 *wdata, unsigned wdata_len, |
923 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 924 | { |
8463200a AS |
925 | struct transaction t = {.command = command, |
926 | .wdata = wdata, .rdata = rdata, | |
927 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 928 | |
d7a76e4c LP |
929 | if (!first_ec) |
930 | return -ENODEV; | |
45bea155 | 931 | |
2a84cb98 | 932 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 933 | } |
ab9e43c6 LP |
934 | EXPORT_SYMBOL(ec_transaction); |
935 | ||
3e2abc5a SF |
936 | /* Get the handle to the EC device */ |
937 | acpi_handle ec_get_handle(void) | |
938 | { | |
939 | if (!first_ec) | |
940 | return NULL; | |
941 | return first_ec->handle; | |
942 | } | |
3e2abc5a SF |
943 | EXPORT_SYMBOL(ec_get_handle); |
944 | ||
ad479e7f LZ |
945 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
946 | { | |
947 | unsigned long flags; | |
948 | ||
949 | spin_lock_irqsave(&ec->lock, flags); | |
950 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 951 | ec_dbg_drv("Starting EC"); |
9887d22a | 952 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 953 | if (!resuming) { |
9887d22a | 954 | acpi_ec_submit_request(ec); |
770970f0 | 955 | ec_dbg_ref(ec, "Increase driver"); |
c2b46d67 | 956 | } |
3535a3c1 | 957 | ec_log_drv("EC started"); |
ad479e7f LZ |
958 | } |
959 | spin_unlock_irqrestore(&ec->lock, flags); | |
960 | } | |
961 | ||
9887d22a LZ |
962 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
963 | { | |
964 | unsigned long flags; | |
965 | bool flushed; | |
966 | ||
967 | spin_lock_irqsave(&ec->lock, flags); | |
968 | flushed = acpi_ec_flushed(ec); | |
969 | spin_unlock_irqrestore(&ec->lock, flags); | |
970 | return flushed; | |
971 | } | |
972 | ||
ad479e7f LZ |
973 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
974 | { | |
975 | unsigned long flags; | |
976 | ||
977 | spin_lock_irqsave(&ec->lock, flags); | |
978 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 979 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 980 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
981 | spin_unlock_irqrestore(&ec->lock, flags); |
982 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
983 | spin_lock_irqsave(&ec->lock, flags); | |
984 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 985 | if (!suspending) { |
9887d22a | 986 | acpi_ec_complete_request(ec); |
770970f0 | 987 | ec_dbg_ref(ec, "Decrease driver"); |
39a2a2aa | 988 | } else if (!ec_freeze_events) |
750f628b | 989 | __acpi_ec_disable_event(ec); |
ad479e7f LZ |
990 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
991 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 992 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
993 | } |
994 | spin_unlock_irqrestore(&ec->lock, flags); | |
995 | } | |
996 | ||
fe955682 | 997 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
998 | { |
999 | struct acpi_ec *ec = first_ec; | |
1000 | ||
1001 | if (!ec) | |
1002 | return; | |
1003 | ||
f351d027 | 1004 | mutex_lock(&ec->mutex); |
f6bb13aa | 1005 | /* Prevent transactions from being carried out */ |
ad479e7f | 1006 | acpi_ec_stop(ec, true); |
f351d027 | 1007 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
1008 | } |
1009 | ||
fe955682 | 1010 | void acpi_ec_unblock_transactions(void) |
d5a64513 RW |
1011 | { |
1012 | /* | |
1013 | * Allow transactions to happen again (this function is called from | |
1014 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
1015 | */ | |
1016 | if (first_ec) | |
ad479e7f | 1017 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
1018 | } |
1019 | ||
1da177e4 LT |
1020 | /* -------------------------------------------------------------------------- |
1021 | Event Management | |
1022 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
1023 | static struct acpi_ec_query_handler * |
1024 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
1025 | { | |
1026 | if (handler) | |
1027 | kref_get(&handler->kref); | |
1028 | return handler; | |
1029 | } | |
1030 | ||
0700c047 LZ |
1031 | static struct acpi_ec_query_handler * |
1032 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) | |
1033 | { | |
1034 | struct acpi_ec_query_handler *handler; | |
1035 | bool found = false; | |
1036 | ||
1037 | mutex_lock(&ec->mutex); | |
1038 | list_for_each_entry(handler, &ec->list, node) { | |
1039 | if (value == handler->query_bit) { | |
1040 | found = true; | |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | mutex_unlock(&ec->mutex); | |
1045 | return found ? acpi_ec_get_query_handler(handler) : NULL; | |
1046 | } | |
1047 | ||
01305d41 LZ |
1048 | static void acpi_ec_query_handler_release(struct kref *kref) |
1049 | { | |
1050 | struct acpi_ec_query_handler *handler = | |
1051 | container_of(kref, struct acpi_ec_query_handler, kref); | |
1052 | ||
1053 | kfree(handler); | |
1054 | } | |
1055 | ||
1056 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
1057 | { | |
1058 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
1059 | } | |
1060 | ||
837012ed AS |
1061 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
1062 | acpi_handle handle, acpi_ec_query_func func, | |
1063 | void *data) | |
1064 | { | |
1065 | struct acpi_ec_query_handler *handler = | |
1066 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 1067 | |
837012ed AS |
1068 | if (!handler) |
1069 | return -ENOMEM; | |
1070 | ||
1071 | handler->query_bit = query_bit; | |
1072 | handler->handle = handle; | |
1073 | handler->func = func; | |
1074 | handler->data = data; | |
f351d027 | 1075 | mutex_lock(&ec->mutex); |
01305d41 | 1076 | kref_init(&handler->kref); |
30c08574 | 1077 | list_add(&handler->node, &ec->list); |
f351d027 | 1078 | mutex_unlock(&ec->mutex); |
837012ed AS |
1079 | return 0; |
1080 | } | |
837012ed AS |
1081 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
1082 | ||
0700c047 LZ |
1083 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
1084 | bool remove_all, u8 query_bit) | |
837012ed | 1085 | { |
1544fdbc | 1086 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 1087 | LIST_HEAD(free_list); |
7a73e60e | 1088 | |
f351d027 | 1089 | mutex_lock(&ec->mutex); |
1544fdbc | 1090 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
0700c047 | 1091 | if (remove_all || query_bit == handler->query_bit) { |
01305d41 LZ |
1092 | list_del_init(&handler->node); |
1093 | list_add(&handler->node, &free_list); | |
837012ed AS |
1094 | } |
1095 | } | |
f351d027 | 1096 | mutex_unlock(&ec->mutex); |
6b5eab54 | 1097 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 1098 | acpi_ec_put_query_handler(handler); |
837012ed | 1099 | } |
0700c047 LZ |
1100 | |
1101 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
1102 | { | |
1103 | acpi_ec_remove_query_handlers(ec, false, query_bit); | |
1104 | } | |
837012ed | 1105 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 1106 | |
02b771b6 | 1107 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
45bea155 | 1108 | { |
02b771b6 LZ |
1109 | struct acpi_ec_query *q; |
1110 | struct transaction *t; | |
1111 | ||
1112 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); | |
1113 | if (!q) | |
1114 | return NULL; | |
1115 | INIT_WORK(&q->work, acpi_ec_event_processor); | |
1116 | t = &q->transaction; | |
1117 | t->command = ACPI_EC_COMMAND_QUERY; | |
1118 | t->rdata = pval; | |
1119 | t->rlen = 1; | |
1120 | return q; | |
1121 | } | |
1122 | ||
1123 | static void acpi_ec_delete_query(struct acpi_ec_query *q) | |
1124 | { | |
1125 | if (q) { | |
1126 | if (q->handler) | |
1127 | acpi_ec_put_query_handler(q->handler); | |
1128 | kfree(q); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static void acpi_ec_event_processor(struct work_struct *work) | |
1133 | { | |
1134 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); | |
1135 | struct acpi_ec_query_handler *handler = q->handler; | |
7a73e60e | 1136 | |
3535a3c1 | 1137 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
1138 | if (handler->func) |
1139 | handler->func(handler->data); | |
1140 | else if (handler->handle) | |
1141 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 1142 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
02b771b6 | 1143 | acpi_ec_delete_query(q); |
a62e8f19 AS |
1144 | } |
1145 | ||
550b3aac | 1146 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
1147 | { |
1148 | u8 value = 0; | |
c2cf5769 | 1149 | int result; |
02b771b6 LZ |
1150 | struct acpi_ec_query *q; |
1151 | ||
1152 | q = acpi_ec_create_query(&value); | |
1153 | if (!q) | |
1154 | return -ENOMEM; | |
3eba563e | 1155 | |
550b3aac LZ |
1156 | /* |
1157 | * Query the EC to find out which _Qxx method we need to evaluate. | |
1158 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
1159 | * bit to be cleared (and thus clearing the interrupt source). | |
1160 | */ | |
02b771b6 | 1161 | result = acpi_ec_transaction(ec, &q->transaction); |
550b3aac | 1162 | if (!value) |
02b771b6 LZ |
1163 | result = -ENODATA; |
1164 | if (result) | |
1165 | goto err_exit; | |
3eba563e | 1166 | |
0700c047 LZ |
1167 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
1168 | if (!q->handler) { | |
1169 | result = -ENODATA; | |
1170 | goto err_exit; | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * It is reported that _Qxx are evaluated in a parallel way on | |
1175 | * Windows: | |
1176 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 | |
1177 | * | |
1178 | * Put this log entry before schedule_work() in order to make | |
1179 | * it appearing before any other log entries occurred during the | |
1180 | * work queue execution. | |
1181 | */ | |
1182 | ec_dbg_evt("Query(0x%02x) scheduled", value); | |
e1191bd4 | 1183 | if (!queue_work(ec_query_wq, &q->work)) { |
0700c047 LZ |
1184 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
1185 | result = -EBUSY; | |
837012ed | 1186 | } |
02b771b6 LZ |
1187 | |
1188 | err_exit: | |
4981c2b7 | 1189 | if (result) |
02b771b6 LZ |
1190 | acpi_ec_delete_query(q); |
1191 | if (data) | |
1192 | *data = value; | |
c2cf5769 | 1193 | return result; |
a62e8f19 AS |
1194 | } |
1195 | ||
1d68d261 LZ |
1196 | static void acpi_ec_check_event(struct acpi_ec *ec) |
1197 | { | |
1198 | unsigned long flags; | |
1199 | ||
1200 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { | |
1201 | if (ec_guard(ec)) { | |
1202 | spin_lock_irqsave(&ec->lock, flags); | |
1203 | /* | |
1204 | * Take care of the SCI_EVT unless no one else is | |
1205 | * taking care of it. | |
1206 | */ | |
1207 | if (!ec->curr) | |
1208 | advance_transaction(ec); | |
1209 | spin_unlock_irqrestore(&ec->lock, flags); | |
1210 | } | |
1211 | } | |
1212 | } | |
1213 | ||
9d8993be | 1214 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 1215 | { |
9d8993be | 1216 | unsigned long flags; |
74443bbe | 1217 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 1218 | |
9d8993be LZ |
1219 | ec_dbg_evt("Event started"); |
1220 | ||
1221 | spin_lock_irqsave(&ec->lock, flags); | |
1222 | while (ec->nr_pending_queries) { | |
1223 | spin_unlock_irqrestore(&ec->lock, flags); | |
1224 | (void)acpi_ec_query(ec, NULL); | |
1225 | spin_lock_irqsave(&ec->lock, flags); | |
1226 | ec->nr_pending_queries--; | |
66db3834 LZ |
1227 | /* |
1228 | * Before exit, make sure that this work item can be | |
1229 | * scheduled again. There might be QR_EC failures, leaving | |
1230 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work | |
1231 | * item from being scheduled again. | |
1232 | */ | |
1233 | if (!ec->nr_pending_queries) { | |
1234 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || | |
1235 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) | |
1236 | acpi_ec_complete_query(ec); | |
1237 | } | |
9d8993be LZ |
1238 | } |
1239 | spin_unlock_irqrestore(&ec->lock, flags); | |
1240 | ||
1241 | ec_dbg_evt("Event stopped"); | |
1d68d261 LZ |
1242 | |
1243 | acpi_ec_check_event(ec); | |
45bea155 | 1244 | } |
1da177e4 | 1245 | |
8b6cd8ad LM |
1246 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
1247 | u32 gpe_number, void *data) | |
1da177e4 | 1248 | { |
f92fca00 | 1249 | unsigned long flags; |
3d02b90b | 1250 | struct acpi_ec *ec = data; |
7c6db4e0 | 1251 | |
f92fca00 | 1252 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 1253 | advance_transaction(ec); |
c0d65341 | 1254 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 1255 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
1256 | } |
1257 | ||
1da177e4 | 1258 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1259 | * Address Space Management |
1260 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1261 | |
1da177e4 | 1262 | static acpi_status |
5b7734b4 | 1263 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1264 | u32 bits, u64 *value64, |
50526df6 | 1265 | void *handler_context, void *region_context) |
1da177e4 | 1266 | { |
3d02b90b | 1267 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1268 | int result = 0, i, bytes = bits / 8; |
1269 | u8 *value = (u8 *)value64; | |
1da177e4 | 1270 | |
1da177e4 | 1271 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1272 | return AE_BAD_PARAMETER; |
1da177e4 | 1273 | |
5b7734b4 | 1274 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1275 | return AE_BAD_PARAMETER; |
1da177e4 | 1276 | |
15de603b | 1277 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1278 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1279 | |
dadf28a1 AS |
1280 | for (i = 0; i < bytes; ++i, ++address, ++value) |
1281 | result = (function == ACPI_READ) ? | |
1282 | acpi_ec_read(ec, address, value) : | |
1283 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1284 | |
15de603b | 1285 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1286 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1287 | |
1da177e4 LT |
1288 | switch (result) { |
1289 | case -EINVAL: | |
d550d98d | 1290 | return AE_BAD_PARAMETER; |
1da177e4 | 1291 | case -ENODEV: |
d550d98d | 1292 | return AE_NOT_FOUND; |
1da177e4 | 1293 | case -ETIME: |
d550d98d | 1294 | return AE_TIME; |
1da177e4 | 1295 | default: |
d550d98d | 1296 | return AE_OK; |
1da177e4 | 1297 | } |
1da177e4 LT |
1298 | } |
1299 | ||
1da177e4 | 1300 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1301 | * Driver Interface |
1302 | * -------------------------------------------------------------------------- */ | |
1303 | ||
c0900c35 AS |
1304 | static acpi_status |
1305 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1306 | ||
c0900c35 AS |
1307 | static struct acpi_ec *make_acpi_ec(void) |
1308 | { | |
1309 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1310 | |
c0900c35 AS |
1311 | if (!ec) |
1312 | return NULL; | |
f351d027 | 1313 | mutex_init(&ec->mutex); |
c0900c35 | 1314 | init_waitqueue_head(&ec->wait); |
837012ed | 1315 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1316 | spin_lock_init(&ec->lock); |
9d8993be | 1317 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1318 | ec->timestamp = jiffies; |
c0900c35 AS |
1319 | return ec; |
1320 | } | |
837012ed | 1321 | |
c019b193 AS |
1322 | static acpi_status |
1323 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1324 | void *context, void **return_value) | |
1325 | { | |
0175d562 LM |
1326 | char node_name[5]; |
1327 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1328 | struct acpi_ec *ec = context; |
1329 | int value = 0; | |
0175d562 LM |
1330 | acpi_status status; |
1331 | ||
1332 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1333 | ||
7a73e60e | 1334 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1335 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1336 | return AE_OK; |
1337 | } | |
1338 | ||
cd8c93a4 AS |
1339 | static acpi_status |
1340 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1341 | { |
cd8c93a4 | 1342 | acpi_status status; |
d21cf3c1 | 1343 | unsigned long long tmp = 0; |
cd8c93a4 | 1344 | struct acpi_ec *ec = context; |
a5032bfd AS |
1345 | |
1346 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1347 | ec->command_addr = ec->data_addr = 0; | |
1348 | ||
cd8c93a4 AS |
1349 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1350 | ec_parse_io_ports, ec); | |
1351 | if (ACPI_FAILURE(status)) | |
1352 | return status; | |
837012ed AS |
1353 | |
1354 | /* Get GPE bit assignment (EC events). */ | |
1355 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1356 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1357 | if (ACPI_FAILURE(status)) |
1358 | return status; | |
27663c58 | 1359 | ec->gpe = tmp; |
837012ed | 1360 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1361 | tmp = 0; |
27663c58 MW |
1362 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1363 | ec->global_lock = tmp; | |
837012ed | 1364 | ec->handle = handle; |
cd8c93a4 | 1365 | return AE_CTRL_TERMINATE; |
837012ed AS |
1366 | } |
1367 | ||
5efc5476 BH |
1368 | static int ec_install_handlers(struct acpi_ec *ec) |
1369 | { | |
1370 | acpi_status status; | |
7a73e60e | 1371 | |
ad479e7f | 1372 | acpi_ec_start(ec, false); |
0e1affe4 LZ |
1373 | |
1374 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { | |
1375 | status = acpi_install_address_space_handler(ec->handle, | |
1376 | ACPI_ADR_SPACE_EC, | |
1377 | &acpi_ec_space_handler, | |
1378 | NULL, ec); | |
1379 | if (ACPI_FAILURE(status)) { | |
1380 | if (status == AE_NOT_FOUND) { | |
1381 | /* | |
1382 | * Maybe OS fails in evaluating the _REG | |
1383 | * object. The AE_NOT_FOUND error will be | |
1384 | * ignored and OS * continue to initialize | |
1385 | * EC. | |
1386 | */ | |
1387 | pr_err("Fail in evaluating the _REG object" | |
1388 | " of EC device. Broken bios is suspected.\n"); | |
1389 | } else { | |
1390 | acpi_ec_stop(ec, false); | |
1391 | return -ENODEV; | |
1392 | } | |
1393 | } | |
1394 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1395 | } | |
1396 | ||
1397 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { | |
1398 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, | |
1399 | ACPI_GPE_EDGE_TRIGGERED, | |
1400 | &acpi_ec_gpe_handler, ec); | |
1401 | /* This is not fatal as we can poll EC events */ | |
1402 | if (ACPI_SUCCESS(status)) { | |
1403 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1404 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
1405 | ec->reference_count >= 1) | |
1406 | acpi_ec_enable_gpe(ec, true); | |
5efc5476 BH |
1407 | } |
1408 | } | |
1409 | ||
5efc5476 BH |
1410 | return 0; |
1411 | } | |
1412 | ||
4c611060 AS |
1413 | static void ec_remove_handlers(struct acpi_ec *ec) |
1414 | { | |
0e1affe4 LZ |
1415 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
1416 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
1417 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
1418 | pr_err("failed to remove space handler\n"); | |
1419 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); | |
1420 | } | |
1421 | ||
fa5b4a50 LZ |
1422 | /* |
1423 | * Stops handling the EC transactions after removing the operation | |
1424 | * region handler. This is required because _REG(DISCONNECT) | |
1425 | * invoked during the removal can result in new EC transactions. | |
1426 | * | |
1427 | * Flushes the EC requests and thus disables the GPE before | |
1428 | * removing the GPE handler. This is required by the current ACPICA | |
1429 | * GPE core. ACPICA GPE core will automatically disable a GPE when | |
1430 | * it is indicated but there is no way to handle it. So the drivers | |
1431 | * must disable the GPEs prior to removing the GPE handlers. | |
1432 | */ | |
1433 | acpi_ec_stop(ec, false); | |
1434 | ||
0e1affe4 LZ |
1435 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
1436 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, | |
1437 | &acpi_ec_gpe_handler))) | |
1438 | pr_err("failed to remove gpe handler\n"); | |
1439 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); | |
1440 | } | |
4c611060 AS |
1441 | } |
1442 | ||
fd6231e7 | 1443 | static struct acpi_ec *acpi_ec_alloc(void) |
1da177e4 | 1444 | { |
fd6231e7 | 1445 | struct acpi_ec *ec; |
c0900c35 | 1446 | |
4c611060 | 1447 | /* Check for boot EC */ |
59f0aa94 | 1448 | if (boot_ec) { |
ce52ddf5 AS |
1449 | ec = boot_ec; |
1450 | boot_ec = NULL; | |
59f0aa94 LZ |
1451 | ec_remove_handlers(ec); |
1452 | if (first_ec == ec) | |
1453 | first_ec = NULL; | |
ce52ddf5 AS |
1454 | } else { |
1455 | ec = make_acpi_ec(); | |
a5032bfd | 1456 | } |
fd6231e7 LZ |
1457 | return ec; |
1458 | } | |
1459 | ||
1460 | static int acpi_ec_add(struct acpi_device *device) | |
1461 | { | |
1462 | struct acpi_ec *ec = NULL; | |
1463 | int ret; | |
1464 | ||
1465 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1466 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1467 | ||
1468 | ec = acpi_ec_alloc(); | |
1469 | if (!ec) | |
1470 | return -ENOMEM; | |
a5032bfd AS |
1471 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
1472 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1473 | kfree(ec); |
1474 | return -EINVAL; | |
4c611060 AS |
1475 | } |
1476 | ||
ce52ddf5 AS |
1477 | /* Find and register all query methods */ |
1478 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1479 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1480 | |
4c611060 AS |
1481 | if (!first_ec) |
1482 | first_ec = ec; | |
db89b4f0 | 1483 | device->driver_data = ec; |
de4f1046 | 1484 | |
d6795fe3 AK |
1485 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1486 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1487 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1488 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1489 | |
16a26e85 | 1490 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1491 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1492 | |
1493 | ret = ec_install_handlers(ec); | |
1494 | ||
1c832b3e LT |
1495 | /* Reprobe devices depending on the EC */ |
1496 | acpi_walk_dep_device_list(ec->handle); | |
1497 | ||
5efc5476 | 1498 | /* EC is fully operational, allow queries */ |
750f628b | 1499 | acpi_ec_enable_event(ec); |
5efc5476 | 1500 | return ret; |
1da177e4 LT |
1501 | } |
1502 | ||
51fac838 | 1503 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1504 | { |
01f22462 | 1505 | struct acpi_ec *ec; |
1da177e4 | 1506 | |
1da177e4 | 1507 | if (!device) |
d550d98d | 1508 | return -EINVAL; |
1da177e4 LT |
1509 | |
1510 | ec = acpi_driver_data(device); | |
cf745ec7 | 1511 | ec_remove_handlers(ec); |
0700c047 | 1512 | acpi_ec_remove_query_handlers(ec, true, 0); |
de4f1046 TR |
1513 | release_region(ec->data_addr, 1); |
1514 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1515 | device->driver_data = NULL; |
d033879c | 1516 | if (ec == first_ec) |
c0900c35 | 1517 | first_ec = NULL; |
4c611060 | 1518 | kfree(ec); |
d550d98d | 1519 | return 0; |
1da177e4 LT |
1520 | } |
1521 | ||
1da177e4 | 1522 | static acpi_status |
c0900c35 | 1523 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1524 | { |
3d02b90b | 1525 | struct acpi_ec *ec = context; |
1da177e4 | 1526 | |
01f22462 | 1527 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1528 | return AE_OK; |
1da177e4 LT |
1529 | |
1530 | /* | |
1531 | * The first address region returned is the data port, and | |
1532 | * the second address region returned is the status/command | |
1533 | * port. | |
1534 | */ | |
de4f1046 | 1535 | if (ec->data_addr == 0) |
6ffb221a | 1536 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1537 | else if (ec->command_addr == 0) |
6ffb221a | 1538 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1539 | else |
1da177e4 | 1540 | return AE_CTRL_TERMINATE; |
1da177e4 | 1541 | |
1da177e4 LT |
1542 | return AE_OK; |
1543 | } | |
1544 | ||
dcf15cbd LZ |
1545 | static const struct acpi_device_id ec_device_ids[] = { |
1546 | {"PNP0C09", 0}, | |
1547 | {"", 0}, | |
1548 | }; | |
1549 | ||
1550 | int __init acpi_ec_dsdt_probe(void) | |
c04209a7 | 1551 | { |
dcf15cbd | 1552 | acpi_status status; |
fd6231e7 LZ |
1553 | struct acpi_ec *ec; |
1554 | int ret; | |
dcf15cbd | 1555 | |
fd6231e7 LZ |
1556 | ec = acpi_ec_alloc(); |
1557 | if (!ec) | |
1558 | return -ENOMEM; | |
dcf15cbd LZ |
1559 | /* |
1560 | * Finding EC from DSDT if there is no ECDT EC available. When this | |
1561 | * function is invoked, ACPI tables have been fully loaded, we can | |
1562 | * walk namespace now. | |
1563 | */ | |
dcf15cbd | 1564 | status = acpi_get_devices(ec_device_ids[0].id, |
fd6231e7 LZ |
1565 | ec_parse_device, ec, NULL); |
1566 | if (ACPI_FAILURE(status) || !ec->handle) { | |
1567 | ret = -ENODEV; | |
1568 | goto error; | |
c04209a7 | 1569 | } |
fd6231e7 LZ |
1570 | ret = ec_install_handlers(ec); |
1571 | ||
1572 | error: | |
1573 | if (ret) | |
1574 | kfree(ec); | |
1575 | else | |
1576 | first_ec = boot_ec = ec; | |
1577 | return ret; | |
c04209a7 AS |
1578 | } |
1579 | ||
3cb02aeb | 1580 | #if 0 |
79149001 | 1581 | /* |
3cb02aeb LZ |
1582 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
1583 | * set, for which case, we complete the QR_EC without issuing it to the | |
1584 | * firmware. | |
1585 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 | |
1586 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 | |
79149001 LZ |
1587 | */ |
1588 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1589 | { | |
1590 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1591 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1592 | return 0; | |
1593 | } | |
3cb02aeb | 1594 | #endif |
79149001 | 1595 | |
ad332c8a KC |
1596 | /* |
1597 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1598 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1599 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1600 | * | |
1601 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1602 | * | |
1603 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1604 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1605 | * behaviour is not known at this time. | |
1606 | * | |
1607 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1608 | * however it is very likely that other Samsung models are affected. | |
1609 | * | |
1610 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1611 | * should be harmless. | |
1612 | */ | |
1613 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1614 | { | |
1615 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1616 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
3cb02aeb | 1617 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
ad332c8a KC |
1618 | return 0; |
1619 | } | |
1620 | ||
bc539567 LZ |
1621 | /* |
1622 | * Some ECDTs contain wrong register addresses. | |
1623 | * MSI MS-171F | |
1624 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 | |
1625 | */ | |
59f0aa94 LZ |
1626 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
1627 | { | |
1628 | pr_debug("Detected system needing ECDT address correction.\n"); | |
1629 | EC_FLAGS_CORRECT_ECDT = 1; | |
1630 | return 0; | |
1631 | } | |
1632 | ||
6cef7497 | 1633 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
0adf3c74 | 1634 | { |
59f0aa94 | 1635 | ec_correct_ecdt, "MSI MS-171F", { |
3174abcf LZ |
1636 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
1637 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, | |
777cb382 | 1638 | { |
ad332c8a KC |
1639 | ec_clear_on_resume, "Samsung hardware", { |
1640 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1641 | {}, |
1642 | }; | |
1643 | ||
c0900c35 AS |
1644 | int __init acpi_ec_ecdt_probe(void) |
1645 | { | |
fd6231e7 | 1646 | int ret; |
c0900c35 | 1647 | acpi_status status; |
50526df6 | 1648 | struct acpi_table_ecdt *ecdt_ptr; |
fd6231e7 | 1649 | struct acpi_ec *ec; |
45bea155 | 1650 | |
fd6231e7 LZ |
1651 | ec = acpi_ec_alloc(); |
1652 | if (!ec) | |
c0900c35 AS |
1653 | return -ENOMEM; |
1654 | /* | |
1655 | * Generate a boot ec context | |
1656 | */ | |
0adf3c74 | 1657 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1658 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1659 | (struct acpi_table_header **)&ecdt_ptr); | |
59f0aa94 LZ |
1660 | if (ACPI_FAILURE(status)) { |
1661 | ret = -ENODEV; | |
1662 | goto error; | |
cd8c93a4 | 1663 | } |
0adf3c74 | 1664 | |
59f0aa94 LZ |
1665 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
1666 | /* | |
1667 | * Asus X50GL: | |
1668 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 | |
1669 | */ | |
1670 | ret = -ENODEV; | |
1671 | goto error; | |
ed4b197d | 1672 | } |
478fa03b | 1673 | |
59f0aa94 LZ |
1674 | pr_info("EC description table is found, configuring boot EC\n"); |
1675 | if (EC_FLAGS_CORRECT_ECDT) { | |
fd6231e7 LZ |
1676 | ec->command_addr = ecdt_ptr->data.address; |
1677 | ec->data_addr = ecdt_ptr->control.address; | |
c6cb0e87 | 1678 | } else { |
fd6231e7 LZ |
1679 | ec->command_addr = ecdt_ptr->control.address; |
1680 | ec->data_addr = ecdt_ptr->data.address; | |
c6cb0e87 | 1681 | } |
fd6231e7 LZ |
1682 | ec->gpe = ecdt_ptr->gpe; |
1683 | ec->handle = ACPI_ROOT_OBJECT; | |
1684 | ret = ec_install_handlers(ec); | |
c5279dee | 1685 | error: |
fd6231e7 LZ |
1686 | if (ret) |
1687 | kfree(ec); | |
1688 | else | |
1689 | first_ec = boot_ec = ec; | |
59f0aa94 | 1690 | return ret; |
1da177e4 LT |
1691 | } |
1692 | ||
df45db61 LZ |
1693 | #ifdef CONFIG_PM_SLEEP |
1694 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) | |
1695 | { | |
1696 | unsigned long flags; | |
1697 | ||
1698 | if (ec == first_ec) { | |
1699 | spin_lock_irqsave(&ec->lock, flags); | |
1700 | ec->saved_busy_polling = ec_busy_polling; | |
1701 | ec->saved_polling_guard = ec_polling_guard; | |
1702 | ec_busy_polling = true; | |
1703 | ec_polling_guard = 0; | |
1704 | ec_log_drv("interrupt blocked"); | |
1705 | spin_unlock_irqrestore(&ec->lock, flags); | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) | |
1710 | { | |
1711 | unsigned long flags; | |
1712 | ||
1713 | if (ec == first_ec) { | |
1714 | spin_lock_irqsave(&ec->lock, flags); | |
1715 | ec_busy_polling = ec->saved_busy_polling; | |
1716 | ec_polling_guard = ec->saved_polling_guard; | |
1717 | ec_log_drv("interrupt unblocked"); | |
1718 | spin_unlock_irqrestore(&ec->lock, flags); | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | static int acpi_ec_suspend_noirq(struct device *dev) | |
1723 | { | |
1724 | struct acpi_ec *ec = | |
1725 | acpi_driver_data(to_acpi_device(dev)); | |
1726 | ||
1727 | acpi_ec_enter_noirq(ec); | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static int acpi_ec_resume_noirq(struct device *dev) | |
1732 | { | |
1733 | struct acpi_ec *ec = | |
1734 | acpi_driver_data(to_acpi_device(dev)); | |
1735 | ||
1736 | acpi_ec_leave_noirq(ec); | |
1737 | return 0; | |
1738 | } | |
c2b46d67 | 1739 | |
39a2a2aa LZ |
1740 | static int acpi_ec_suspend(struct device *dev) |
1741 | { | |
1742 | struct acpi_ec *ec = | |
1743 | acpi_driver_data(to_acpi_device(dev)); | |
1744 | ||
1745 | if (ec_freeze_events) | |
1746 | acpi_ec_disable_event(ec); | |
1747 | return 0; | |
1748 | } | |
1749 | ||
c2b46d67 LZ |
1750 | static int acpi_ec_resume(struct device *dev) |
1751 | { | |
1752 | struct acpi_ec *ec = | |
1753 | acpi_driver_data(to_acpi_device(dev)); | |
1754 | ||
1755 | acpi_ec_enable_event(ec); | |
1756 | return 0; | |
1757 | } | |
df45db61 LZ |
1758 | #endif |
1759 | ||
1760 | static const struct dev_pm_ops acpi_ec_pm = { | |
1761 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) | |
39a2a2aa | 1762 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
df45db61 LZ |
1763 | }; |
1764 | ||
1d68d261 LZ |
1765 | static int param_set_event_clearing(const char *val, struct kernel_param *kp) |
1766 | { | |
1767 | int result = 0; | |
1768 | ||
1769 | if (!strncmp(val, "status", sizeof("status") - 1)) { | |
1770 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; | |
1771 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); | |
1772 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { | |
1773 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; | |
1774 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); | |
1775 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { | |
1776 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; | |
1777 | pr_info("Assuming SCI_EVT clearing on event reads\n"); | |
1778 | } else | |
1779 | result = -EINVAL; | |
1780 | return result; | |
1781 | } | |
1782 | ||
1783 | static int param_get_event_clearing(char *buffer, struct kernel_param *kp) | |
1784 | { | |
1785 | switch (ec_event_clearing) { | |
1786 | case ACPI_EC_EVT_TIMING_STATUS: | |
1787 | return sprintf(buffer, "status"); | |
1788 | case ACPI_EC_EVT_TIMING_QUERY: | |
1789 | return sprintf(buffer, "query"); | |
1790 | case ACPI_EC_EVT_TIMING_EVENT: | |
1791 | return sprintf(buffer, "event"); | |
1792 | default: | |
1793 | return sprintf(buffer, "invalid"); | |
1794 | } | |
1795 | return 0; | |
1796 | } | |
1797 | ||
1798 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, | |
1799 | NULL, 0644); | |
1800 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); | |
1801 | ||
223883b7 AS |
1802 | static struct acpi_driver acpi_ec_driver = { |
1803 | .name = "ec", | |
1804 | .class = ACPI_EC_CLASS, | |
1805 | .ids = ec_device_ids, | |
1806 | .ops = { | |
1807 | .add = acpi_ec_add, | |
1808 | .remove = acpi_ec_remove, | |
223883b7 | 1809 | }, |
df45db61 | 1810 | .drv.pm = &acpi_ec_pm, |
223883b7 AS |
1811 | }; |
1812 | ||
e1191bd4 LZ |
1813 | static inline int acpi_ec_query_init(void) |
1814 | { | |
1815 | if (!ec_query_wq) { | |
1816 | ec_query_wq = alloc_workqueue("kec_query", 0, | |
1817 | ec_max_queries); | |
1818 | if (!ec_query_wq) | |
1819 | return -ENODEV; | |
1820 | } | |
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | static inline void acpi_ec_query_exit(void) | |
1825 | { | |
1826 | if (ec_query_wq) { | |
1827 | destroy_workqueue(ec_query_wq); | |
1828 | ec_query_wq = NULL; | |
1829 | } | |
1830 | } | |
1831 | ||
a5f820fe | 1832 | int __init acpi_ec_init(void) |
1da177e4 | 1833 | { |
e1191bd4 | 1834 | int result; |
1da177e4 | 1835 | |
e1191bd4 LZ |
1836 | /* register workqueue for _Qxx evaluations */ |
1837 | result = acpi_ec_query_init(); | |
1838 | if (result) | |
1839 | goto err_exit; | |
1da177e4 LT |
1840 | /* Now register the driver for the EC */ |
1841 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
e1191bd4 LZ |
1842 | if (result) |
1843 | goto err_exit; | |
1da177e4 | 1844 | |
e1191bd4 LZ |
1845 | err_exit: |
1846 | if (result) | |
1847 | acpi_ec_query_exit(); | |
d550d98d | 1848 | return result; |
1da177e4 LT |
1849 | } |
1850 | ||
1da177e4 LT |
1851 | /* EC driver currently not unloadable */ |
1852 | #if 0 | |
50526df6 | 1853 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1854 | { |
1da177e4 LT |
1855 | |
1856 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
e1191bd4 | 1857 | acpi_ec_query_exit(); |
1da177e4 | 1858 | } |
7843932a | 1859 | #endif /* 0 */ |