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 | * | |
25 | * You should have received a copy of the GNU General Public License along | |
26 | * with this program; if not, write to the Free Software Foundation, Inc., | |
27 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
28 | * | |
29 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
30 | */ | |
31 | ||
7c6db4e0 | 32 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 33 | /* #define DEBUG */ |
16a26e85 | 34 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 35 | |
1da177e4 LT |
36 | #include <linux/kernel.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/delay.h> | |
451566f4 | 41 | #include <linux/interrupt.h> |
837012ed | 42 | #include <linux/list.h> |
7c6db4e0 | 43 | #include <linux/spinlock.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
8b48463f | 45 | #include <linux/acpi.h> |
eb27cae8 | 46 | #include <linux/dmi.h> |
8b48463f | 47 | #include <asm/io.h> |
1da177e4 | 48 | |
1195a098 TR |
49 | #include "internal.h" |
50 | ||
1da177e4 | 51 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
52 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
53 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 54 | |
703959d4 | 55 | /* EC status register */ |
1da177e4 LT |
56 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
57 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 58 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 59 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 60 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 61 | |
703959d4 | 62 | /* EC commands */ |
3261ff4d | 63 | enum ec_command { |
6ccedb10 AS |
64 | ACPI_EC_COMMAND_READ = 0x80, |
65 | ACPI_EC_COMMAND_WRITE = 0x81, | |
66 | ACPI_EC_BURST_ENABLE = 0x82, | |
67 | ACPI_EC_BURST_DISABLE = 0x83, | |
68 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 69 | }; |
837012ed | 70 | |
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
d8d031a6 | 73 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
ad332c8a KC |
74 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
75 | * when trying to clear the EC */ | |
703959d4 | 76 | |
080e412c | 77 | enum { |
37d11391 | 78 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
f6bb13aa | 79 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 80 | * OpReg are installed */ |
ad479e7f LZ |
81 | EC_FLAGS_STARTED, /* Driver is started */ |
82 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
83 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
84 | * current command processing */ | |
1da177e4 | 85 | }; |
6ffb221a | 86 | |
f92fca00 LZ |
87 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
88 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
89 | ||
7a18e96d TR |
90 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
91 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
92 | module_param(ec_delay, uint, 0644); | |
93 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
94 | ||
15de603b LZ |
95 | static bool ec_busy_polling __read_mostly; |
96 | module_param(ec_busy_polling, bool, 0644); | |
97 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); | |
98 | ||
99 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; | |
100 | module_param(ec_polling_guard, uint, 0644); | |
101 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); | |
102 | ||
a520d52e FT |
103 | /* |
104 | * If the number of false interrupts per one transaction exceeds | |
105 | * this threshold, will think there is a GPE storm happened and | |
106 | * will disable the GPE for normal transaction. | |
107 | */ | |
108 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
109 | module_param(ec_storm_threshold, uint, 0644); | |
110 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
111 | ||
837012ed AS |
112 | struct acpi_ec_query_handler { |
113 | struct list_head node; | |
114 | acpi_ec_query_func func; | |
115 | acpi_handle handle; | |
116 | void *data; | |
117 | u8 query_bit; | |
01305d41 | 118 | struct kref kref; |
837012ed AS |
119 | }; |
120 | ||
8463200a | 121 | struct transaction { |
7c6db4e0 AS |
122 | const u8 *wdata; |
123 | u8 *rdata; | |
124 | unsigned short irq_count; | |
8463200a | 125 | u8 command; |
a2f93aea AS |
126 | u8 wi; |
127 | u8 ri; | |
7c6db4e0 AS |
128 | u8 wlen; |
129 | u8 rlen; | |
f92fca00 | 130 | u8 flags; |
7c6db4e0 AS |
131 | }; |
132 | ||
550b3aac | 133 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 134 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 135 | |
1195a098 TR |
136 | struct acpi_ec *boot_ec, *first_ec; |
137 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 138 | |
0adf3c74 | 139 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 140 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 141 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 142 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 143 | |
3535a3c1 LZ |
144 | /* -------------------------------------------------------------------------- |
145 | * Logging/Debugging | |
146 | * -------------------------------------------------------------------------- */ | |
147 | ||
148 | /* | |
149 | * Splitters used by the developers to track the boundary of the EC | |
150 | * handling processes. | |
151 | */ | |
152 | #ifdef DEBUG | |
153 | #define EC_DBG_SEP " " | |
154 | #define EC_DBG_DRV "+++++" | |
155 | #define EC_DBG_STM "=====" | |
156 | #define EC_DBG_REQ "*****" | |
157 | #define EC_DBG_EVT "#####" | |
158 | #else | |
159 | #define EC_DBG_SEP "" | |
160 | #define EC_DBG_DRV | |
161 | #define EC_DBG_STM | |
162 | #define EC_DBG_REQ | |
163 | #define EC_DBG_EVT | |
164 | #endif | |
165 | ||
166 | #define ec_log_raw(fmt, ...) \ | |
167 | pr_info(fmt "\n", ##__VA_ARGS__) | |
168 | #define ec_dbg_raw(fmt, ...) \ | |
169 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
170 | #define ec_log(filter, fmt, ...) \ | |
171 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
172 | #define ec_dbg(filter, fmt, ...) \ | |
173 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
174 | ||
175 | #define ec_log_drv(fmt, ...) \ | |
176 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
177 | #define ec_dbg_drv(fmt, ...) \ | |
178 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
179 | #define ec_dbg_stm(fmt, ...) \ | |
180 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
181 | #define ec_dbg_req(fmt, ...) \ | |
182 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
183 | #define ec_dbg_evt(fmt, ...) \ | |
184 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
185 | #define ec_dbg_ref(ec, fmt, ...) \ |
186 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 187 | |
ad479e7f LZ |
188 | /* -------------------------------------------------------------------------- |
189 | * Device Flags | |
190 | * -------------------------------------------------------------------------- */ | |
191 | ||
192 | static bool acpi_ec_started(struct acpi_ec *ec) | |
193 | { | |
194 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
195 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
196 | } | |
197 | ||
9887d22a LZ |
198 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
199 | { | |
200 | return ec->reference_count == 1; | |
201 | } | |
202 | ||
1da177e4 | 203 | /* -------------------------------------------------------------------------- |
ca37bfdf | 204 | * EC Registers |
7a73e60e | 205 | * -------------------------------------------------------------------------- */ |
1da177e4 | 206 | |
6ffb221a | 207 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 208 | { |
3ebe08a7 | 209 | u8 x = inb(ec->command_addr); |
7a73e60e | 210 | |
3535a3c1 LZ |
211 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
212 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
213 | x, | |
214 | !!(x & ACPI_EC_FLAG_SCI), | |
215 | !!(x & ACPI_EC_FLAG_BURST), | |
216 | !!(x & ACPI_EC_FLAG_CMD), | |
217 | !!(x & ACPI_EC_FLAG_IBF), | |
218 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 219 | return x; |
451566f4 DT |
220 | } |
221 | ||
6ffb221a | 222 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 223 | { |
3ebe08a7 | 224 | u8 x = inb(ec->data_addr); |
7a73e60e | 225 | |
d8d031a6 | 226 | ec->timestamp = jiffies; |
3535a3c1 | 227 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 228 | return x; |
7c6db5e5 DS |
229 | } |
230 | ||
6ffb221a | 231 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 232 | { |
3535a3c1 | 233 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 234 | outb(command, ec->command_addr); |
d8d031a6 | 235 | ec->timestamp = jiffies; |
45bea155 LY |
236 | } |
237 | ||
6ffb221a | 238 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 239 | { |
3535a3c1 | 240 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 241 | outb(data, ec->data_addr); |
d8d031a6 | 242 | ec->timestamp = jiffies; |
703959d4 | 243 | } |
45bea155 | 244 | |
e34c0e2b LZ |
245 | #ifdef DEBUG |
246 | static const char *acpi_ec_cmd_string(u8 cmd) | |
247 | { | |
248 | switch (cmd) { | |
249 | case 0x80: | |
250 | return "RD_EC"; | |
251 | case 0x81: | |
252 | return "WR_EC"; | |
253 | case 0x82: | |
254 | return "BE_EC"; | |
255 | case 0x83: | |
256 | return "BD_EC"; | |
257 | case 0x84: | |
258 | return "QR_EC"; | |
259 | } | |
260 | return "UNKNOWN"; | |
261 | } | |
262 | #else | |
263 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
264 | #endif | |
265 | ||
ca37bfdf LZ |
266 | /* -------------------------------------------------------------------------- |
267 | * GPE Registers | |
268 | * -------------------------------------------------------------------------- */ | |
269 | ||
270 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
271 | { | |
272 | acpi_event_status gpe_status = 0; | |
273 | ||
274 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 275 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
276 | } |
277 | ||
278 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
279 | { | |
280 | if (open) | |
281 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
282 | else { |
283 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 284 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 285 | } |
ca37bfdf LZ |
286 | if (acpi_ec_is_gpe_raised(ec)) { |
287 | /* | |
288 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
289 | * software need to manually trigger a pseudo GPE event on | |
290 | * EN=1 writes. | |
291 | */ | |
3535a3c1 | 292 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
293 | advance_transaction(ec); |
294 | } | |
295 | } | |
296 | ||
297 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
298 | { | |
299 | if (close) | |
300 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
301 | else { |
302 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 303 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 304 | } |
ca37bfdf LZ |
305 | } |
306 | ||
307 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
308 | { | |
309 | /* | |
310 | * GPE STS is a W1C register, which means: | |
311 | * 1. Software can clear it without worrying about clearing other | |
312 | * GPEs' STS bits when the hardware sets them in parallel. | |
313 | * 2. As long as software can ensure only clearing it when it is | |
314 | * set, hardware won't set it in parallel. | |
315 | * So software can clear GPE in any contexts. | |
316 | * Warning: do not move the check into advance_transaction() as the | |
317 | * EC commands will be sent without GPE raised. | |
318 | */ | |
319 | if (!acpi_ec_is_gpe_raised(ec)) | |
320 | return; | |
321 | acpi_clear_gpe(NULL, ec->gpe); | |
322 | } | |
323 | ||
324 | /* -------------------------------------------------------------------------- | |
325 | * Transaction Management | |
326 | * -------------------------------------------------------------------------- */ | |
327 | ||
9887d22a LZ |
328 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
329 | { | |
330 | ec->reference_count++; | |
331 | if (ec->reference_count == 1) | |
332 | acpi_ec_enable_gpe(ec, true); | |
333 | } | |
334 | ||
335 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
336 | { | |
337 | bool flushed = false; | |
338 | ||
339 | ec->reference_count--; | |
340 | if (ec->reference_count == 0) | |
341 | acpi_ec_disable_gpe(ec, true); | |
342 | flushed = acpi_ec_flushed(ec); | |
343 | if (flushed) | |
344 | wake_up(&ec->wait); | |
345 | } | |
346 | ||
e1d4d90f LZ |
347 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
348 | { | |
349 | if (!test_bit(flag, &ec->flags)) { | |
350 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 351 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
352 | set_bit(flag, &ec->flags); |
353 | } | |
354 | } | |
355 | ||
356 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
357 | { | |
358 | if (test_bit(flag, &ec->flags)) { | |
359 | clear_bit(flag, &ec->flags); | |
360 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 361 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
362 | } |
363 | } | |
364 | ||
9887d22a LZ |
365 | /* |
366 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
367 | * the flush operation is not in | |
368 | * progress | |
369 | * @ec: the EC device | |
370 | * | |
371 | * This function must be used before taking a new action that should hold | |
372 | * the reference count. If this function returns false, then the action | |
373 | * must be discarded or it will prevent the flush operation from being | |
374 | * completed. | |
375 | */ | |
37d11391 | 376 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 377 | { |
37d11391 RW |
378 | if (!acpi_ec_started(ec)) |
379 | return false; | |
9887d22a LZ |
380 | acpi_ec_submit_request(ec); |
381 | return true; | |
382 | } | |
383 | ||
37d11391 | 384 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 385 | { |
37d11391 | 386 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
9d8993be LZ |
387 | ec_dbg_evt("Command(%s) submitted/blocked", |
388 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
389 | ec->nr_pending_queries++; | |
74443bbe LZ |
390 | schedule_work(&ec->work); |
391 | } | |
392 | } | |
393 | ||
37d11391 | 394 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe | 395 | { |
f8b8eb71 | 396 | if (test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
37d11391 | 397 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
9d8993be LZ |
398 | ec_dbg_evt("Command(%s) unblocked", |
399 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
74443bbe LZ |
400 | } |
401 | } | |
402 | ||
d8d031a6 LZ |
403 | static int ec_transaction_polled(struct acpi_ec *ec) |
404 | { | |
405 | unsigned long flags; | |
406 | int ret = 0; | |
407 | ||
408 | spin_lock_irqsave(&ec->lock, flags); | |
409 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
410 | ret = 1; | |
411 | spin_unlock_irqrestore(&ec->lock, flags); | |
412 | return ret; | |
413 | } | |
414 | ||
f92fca00 | 415 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 416 | { |
7c6db4e0 AS |
417 | unsigned long flags; |
418 | int ret = 0; | |
7a73e60e | 419 | |
f351d027 | 420 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 421 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 422 | ret = 1; |
f351d027 | 423 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 424 | return ret; |
45bea155 | 425 | } |
451566f4 | 426 | |
f8b8eb71 LZ |
427 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
428 | { | |
429 | ec->curr->flags |= flag; | |
430 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
431 | if (flag == ACPI_EC_COMMAND_POLL) | |
432 | acpi_ec_complete_query(ec); | |
433 | } | |
434 | } | |
435 | ||
0c78808f | 436 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 437 | { |
36b15875 | 438 | struct transaction *t; |
66b42b78 | 439 | u8 status; |
c0d65341 | 440 | bool wakeup = false; |
b76b51ba | 441 | |
3535a3c1 LZ |
442 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
443 | smp_processor_id()); | |
ca37bfdf LZ |
444 | /* |
445 | * By always clearing STS before handling all indications, we can | |
446 | * ensure a hardware STS 0->1 change after this clearing can always | |
447 | * trigger a GPE interrupt. | |
448 | */ | |
449 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 450 | status = acpi_ec_read_status(ec); |
36b15875 | 451 | t = ec->curr; |
b76b51ba | 452 | if (!t) |
f92fca00 LZ |
453 | goto err; |
454 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
455 | if (t->wlen > t->wi) { | |
456 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
457 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
458 | else | |
459 | goto err; | |
460 | } else if (t->rlen > t->ri) { | |
461 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
462 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 463 | if (t->rlen == t->ri) { |
f8b8eb71 | 464 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
3afcf2ec | 465 | if (t->command == ACPI_EC_COMMAND_QUERY) |
9d8993be LZ |
466 | ec_dbg_evt("Command(%s) completed by hardware", |
467 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
c0d65341 LZ |
468 | wakeup = true; |
469 | } | |
f92fca00 LZ |
470 | } else |
471 | goto err; | |
472 | } else if (t->wlen == t->wi && | |
c0d65341 | 473 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f8b8eb71 | 474 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
c0d65341 LZ |
475 | wakeup = true; |
476 | } | |
0c78808f | 477 | goto out; |
f92fca00 | 478 | } else { |
79149001 LZ |
479 | if (EC_FLAGS_QUERY_HANDSHAKE && |
480 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec | 481 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
f8b8eb71 | 482 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
3afcf2ec | 483 | t->rdata[t->ri++] = 0x00; |
f8b8eb71 | 484 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
9d8993be LZ |
485 | ec_dbg_evt("Command(%s) completed by software", |
486 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); | |
3afcf2ec LZ |
487 | wakeup = true; |
488 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 | 489 | acpi_ec_write_cmd(ec, t->command); |
f8b8eb71 | 490 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
7c6db4e0 | 491 | } else |
dd15f8c4 | 492 | goto err; |
0c78808f | 493 | goto out; |
f92fca00 | 494 | } |
dd15f8c4 | 495 | err: |
a3cd8d27 FT |
496 | /* |
497 | * If SCI bit is set, then don't think it's a false IRQ | |
498 | * otherwise will take a not handled IRQ as a false one. | |
499 | */ | |
f92fca00 | 500 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
501 | if (in_interrupt() && t) { |
502 | if (t->irq_count < ec_storm_threshold) | |
503 | ++t->irq_count; | |
504 | /* Allow triggering on 0 threshold */ | |
505 | if (t->irq_count == ec_storm_threshold) | |
506 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
507 | } | |
f92fca00 | 508 | } |
0c78808f | 509 | out: |
74443bbe | 510 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 511 | acpi_ec_submit_query(ec); |
0c78808f LZ |
512 | if (wakeup && in_interrupt()) |
513 | wake_up(&ec->wait); | |
f92fca00 | 514 | } |
a3cd8d27 | 515 | |
f92fca00 LZ |
516 | static void start_transaction(struct acpi_ec *ec) |
517 | { | |
518 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
519 | ec->curr->flags = 0; | |
d8d031a6 LZ |
520 | } |
521 | ||
522 | static int ec_guard(struct acpi_ec *ec) | |
523 | { | |
15de603b | 524 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
d8d031a6 LZ |
525 | unsigned long timeout = ec->timestamp + guard; |
526 | ||
527 | do { | |
15de603b | 528 | if (ec_busy_polling) { |
d8d031a6 LZ |
529 | /* Perform busy polling */ |
530 | if (ec_transaction_completed(ec)) | |
531 | return 0; | |
532 | udelay(jiffies_to_usecs(guard)); | |
533 | } else { | |
534 | /* | |
535 | * Perform wait polling | |
536 | * | |
537 | * The following check is there to keep the old | |
538 | * logic - no inter-transaction guarding for the | |
539 | * wait polling mode. | |
540 | */ | |
541 | if (!ec_transaction_polled(ec)) | |
542 | break; | |
543 | if (wait_event_timeout(ec->wait, | |
544 | ec_transaction_completed(ec), | |
545 | guard)) | |
546 | return 0; | |
547 | } | |
548 | /* Guard the register accesses for the polling modes */ | |
549 | } while (time_before(jiffies, timeout)); | |
550 | return -ETIME; | |
845625cd | 551 | } |
03d1d99c | 552 | |
7c6db4e0 AS |
553 | static int ec_poll(struct acpi_ec *ec) |
554 | { | |
2a84cb98 | 555 | unsigned long flags; |
28fe5c82 | 556 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 557 | |
2a84cb98 AS |
558 | while (repeat--) { |
559 | unsigned long delay = jiffies + | |
7a18e96d | 560 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 561 | do { |
d8d031a6 LZ |
562 | if (!ec_guard(ec)) |
563 | return 0; | |
f92fca00 | 564 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 565 | advance_transaction(ec); |
f92fca00 | 566 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 567 | } while (time_before(jiffies, delay)); |
16a26e85 | 568 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 569 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 570 | start_transaction(ec); |
f351d027 | 571 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 572 | } |
b77d81b2 | 573 | return -ETIME; |
1da177e4 LT |
574 | } |
575 | ||
8463200a | 576 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 577 | struct transaction *t) |
45bea155 | 578 | { |
7c6db4e0 | 579 | unsigned long tmp; |
7c6db4e0 | 580 | int ret = 0; |
7a73e60e | 581 | |
7c6db4e0 | 582 | /* start transaction */ |
f351d027 | 583 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 584 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 585 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
586 | ret = -EINVAL; |
587 | goto unlock; | |
588 | } | |
770970f0 | 589 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 590 | /* following two actions should be kept atomic */ |
8463200a | 591 | ec->curr = t; |
3535a3c1 | 592 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 593 | start_transaction(ec); |
df9ff918 | 594 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 595 | |
df9ff918 | 596 | ret = ec_poll(ec); |
d8d031a6 | 597 | |
df9ff918 | 598 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
599 | if (t->irq_count == ec_storm_threshold) |
600 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 601 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 602 | ec->curr = NULL; |
9887d22a LZ |
603 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
604 | acpi_ec_complete_request(ec); | |
770970f0 | 605 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 606 | unlock: |
f351d027 | 607 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
608 | return ret; |
609 | } | |
610 | ||
2a84cb98 | 611 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 612 | { |
d7a76e4c | 613 | int status; |
50526df6 | 614 | u32 glk; |
7a73e60e | 615 | |
8463200a | 616 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 617 | return -EINVAL; |
8463200a AS |
618 | if (t->rdata) |
619 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 620 | |
f351d027 | 621 | mutex_lock(&ec->mutex); |
703959d4 | 622 | if (ec->global_lock) { |
1da177e4 | 623 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 624 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
625 | status = -ENODEV; |
626 | goto unlock; | |
c24e912b | 627 | } |
1da177e4 | 628 | } |
a62e8f19 | 629 | |
2a84cb98 | 630 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 631 | |
703959d4 | 632 | if (ec->global_lock) |
1da177e4 | 633 | acpi_release_global_lock(glk); |
7c6db4e0 | 634 | unlock: |
f351d027 | 635 | mutex_unlock(&ec->mutex); |
d550d98d | 636 | return status; |
1da177e4 LT |
637 | } |
638 | ||
8a383ef0 | 639 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
640 | { |
641 | u8 d; | |
8463200a AS |
642 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
643 | .wdata = NULL, .rdata = &d, | |
644 | .wlen = 0, .rlen = 1}; | |
645 | ||
2a84cb98 | 646 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
647 | } |
648 | ||
8a383ef0 | 649 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 650 | { |
8463200a AS |
651 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
652 | .wdata = NULL, .rdata = NULL, | |
653 | .wlen = 0, .rlen = 0}; | |
654 | ||
7c6db4e0 | 655 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 656 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
657 | } |
658 | ||
7a73e60e | 659 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
660 | { |
661 | int result; | |
662 | u8 d; | |
8463200a AS |
663 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
664 | .wdata = &address, .rdata = &d, | |
665 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 666 | |
2a84cb98 | 667 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
668 | *data = d; |
669 | return result; | |
670 | } | |
6ffb221a | 671 | |
3576cf61 DS |
672 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
673 | { | |
6ccedb10 | 674 | u8 wdata[2] = { address, data }; |
8463200a AS |
675 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
676 | .wdata = wdata, .rdata = NULL, | |
677 | .wlen = 2, .rlen = 0}; | |
678 | ||
2a84cb98 | 679 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
680 | } |
681 | ||
b76b51ba | 682 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 683 | { |
1da177e4 | 684 | int err; |
6ffb221a | 685 | u8 temp_data; |
1da177e4 LT |
686 | |
687 | if (!first_ec) | |
688 | return -ENODEV; | |
689 | ||
d033879c | 690 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
691 | |
692 | if (!err) { | |
693 | *val = temp_data; | |
694 | return 0; | |
7a73e60e LZ |
695 | } |
696 | return err; | |
1da177e4 LT |
697 | } |
698 | EXPORT_SYMBOL(ec_read); | |
699 | ||
50526df6 | 700 | int ec_write(u8 addr, u8 val) |
1da177e4 | 701 | { |
1da177e4 LT |
702 | int err; |
703 | ||
704 | if (!first_ec) | |
705 | return -ENODEV; | |
706 | ||
d033879c | 707 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
708 | |
709 | return err; | |
710 | } | |
711 | EXPORT_SYMBOL(ec_write); | |
712 | ||
616362de | 713 | int ec_transaction(u8 command, |
7a73e60e LZ |
714 | const u8 *wdata, unsigned wdata_len, |
715 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 716 | { |
8463200a AS |
717 | struct transaction t = {.command = command, |
718 | .wdata = wdata, .rdata = rdata, | |
719 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 720 | |
d7a76e4c LP |
721 | if (!first_ec) |
722 | return -ENODEV; | |
45bea155 | 723 | |
2a84cb98 | 724 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 725 | } |
ab9e43c6 LP |
726 | EXPORT_SYMBOL(ec_transaction); |
727 | ||
3e2abc5a SF |
728 | /* Get the handle to the EC device */ |
729 | acpi_handle ec_get_handle(void) | |
730 | { | |
731 | if (!first_ec) | |
732 | return NULL; | |
733 | return first_ec->handle; | |
734 | } | |
3e2abc5a SF |
735 | EXPORT_SYMBOL(ec_get_handle); |
736 | ||
ad332c8a | 737 | /* |
3eba563e | 738 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
739 | * Run with locked ec mutex. |
740 | */ | |
741 | static void acpi_ec_clear(struct acpi_ec *ec) | |
742 | { | |
743 | int i, status; | |
744 | u8 value = 0; | |
745 | ||
746 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 747 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
748 | if (status || !value) |
749 | break; | |
750 | } | |
751 | ||
752 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
753 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
754 | else | |
755 | pr_info("%d stale EC events cleared\n", i); | |
756 | } | |
757 | ||
ad479e7f LZ |
758 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
759 | { | |
760 | unsigned long flags; | |
761 | ||
762 | spin_lock_irqsave(&ec->lock, flags); | |
763 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 764 | ec_dbg_drv("Starting EC"); |
9887d22a | 765 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 766 | if (!resuming) { |
9887d22a | 767 | acpi_ec_submit_request(ec); |
770970f0 LZ |
768 | ec_dbg_ref(ec, "Increase driver"); |
769 | } | |
3535a3c1 | 770 | ec_log_drv("EC started"); |
ad479e7f LZ |
771 | } |
772 | spin_unlock_irqrestore(&ec->lock, flags); | |
773 | } | |
774 | ||
9887d22a LZ |
775 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
776 | { | |
777 | unsigned long flags; | |
778 | bool flushed; | |
779 | ||
780 | spin_lock_irqsave(&ec->lock, flags); | |
781 | flushed = acpi_ec_flushed(ec); | |
782 | spin_unlock_irqrestore(&ec->lock, flags); | |
783 | return flushed; | |
784 | } | |
785 | ||
ad479e7f LZ |
786 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
787 | { | |
788 | unsigned long flags; | |
789 | ||
790 | spin_lock_irqsave(&ec->lock, flags); | |
791 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 792 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 793 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
794 | spin_unlock_irqrestore(&ec->lock, flags); |
795 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
796 | spin_lock_irqsave(&ec->lock, flags); | |
797 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 798 | if (!suspending) { |
9887d22a | 799 | acpi_ec_complete_request(ec); |
770970f0 LZ |
800 | ec_dbg_ref(ec, "Decrease driver"); |
801 | } | |
ad479e7f LZ |
802 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
803 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 804 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
805 | } |
806 | spin_unlock_irqrestore(&ec->lock, flags); | |
807 | } | |
808 | ||
fe955682 | 809 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
810 | { |
811 | struct acpi_ec *ec = first_ec; | |
812 | ||
813 | if (!ec) | |
814 | return; | |
815 | ||
f351d027 | 816 | mutex_lock(&ec->mutex); |
f6bb13aa | 817 | /* Prevent transactions from being carried out */ |
ad479e7f | 818 | acpi_ec_stop(ec, true); |
f351d027 | 819 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
820 | } |
821 | ||
fe955682 | 822 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
823 | { |
824 | struct acpi_ec *ec = first_ec; | |
825 | ||
826 | if (!ec) | |
827 | return; | |
828 | ||
f6bb13aa | 829 | /* Allow transactions to be carried out again */ |
ad479e7f | 830 | acpi_ec_start(ec, true); |
ad332c8a KC |
831 | |
832 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
833 | acpi_ec_clear(ec); | |
f6bb13aa RW |
834 | } |
835 | ||
fe955682 | 836 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
837 | { |
838 | /* | |
839 | * Allow transactions to happen again (this function is called from | |
840 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
841 | */ | |
842 | if (first_ec) | |
ad479e7f | 843 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
844 | } |
845 | ||
1da177e4 LT |
846 | /* -------------------------------------------------------------------------- |
847 | Event Management | |
848 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
849 | static struct acpi_ec_query_handler * |
850 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
851 | { | |
852 | if (handler) | |
853 | kref_get(&handler->kref); | |
854 | return handler; | |
855 | } | |
856 | ||
857 | static void acpi_ec_query_handler_release(struct kref *kref) | |
858 | { | |
859 | struct acpi_ec_query_handler *handler = | |
860 | container_of(kref, struct acpi_ec_query_handler, kref); | |
861 | ||
862 | kfree(handler); | |
863 | } | |
864 | ||
865 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
866 | { | |
867 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
868 | } | |
869 | ||
837012ed AS |
870 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
871 | acpi_handle handle, acpi_ec_query_func func, | |
872 | void *data) | |
873 | { | |
874 | struct acpi_ec_query_handler *handler = | |
875 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 876 | |
837012ed AS |
877 | if (!handler) |
878 | return -ENOMEM; | |
879 | ||
880 | handler->query_bit = query_bit; | |
881 | handler->handle = handle; | |
882 | handler->func = func; | |
883 | handler->data = data; | |
f351d027 | 884 | mutex_lock(&ec->mutex); |
01305d41 | 885 | kref_init(&handler->kref); |
30c08574 | 886 | list_add(&handler->node, &ec->list); |
f351d027 | 887 | mutex_unlock(&ec->mutex); |
837012ed AS |
888 | return 0; |
889 | } | |
837012ed AS |
890 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
891 | ||
892 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
893 | { | |
1544fdbc | 894 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 895 | LIST_HEAD(free_list); |
7a73e60e | 896 | |
f351d027 | 897 | mutex_lock(&ec->mutex); |
1544fdbc | 898 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 899 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
900 | list_del_init(&handler->node); |
901 | list_add(&handler->node, &free_list); | |
837012ed AS |
902 | } |
903 | } | |
f351d027 | 904 | mutex_unlock(&ec->mutex); |
6b5eab54 | 905 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 906 | acpi_ec_put_query_handler(handler); |
837012ed | 907 | } |
837012ed | 908 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 909 | |
a62e8f19 | 910 | static void acpi_ec_run(void *cxt) |
45bea155 | 911 | { |
a62e8f19 | 912 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 913 | |
a62e8f19 | 914 | if (!handler) |
e41334c0 | 915 | return; |
3535a3c1 | 916 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
917 | if (handler->func) |
918 | handler->func(handler->data); | |
919 | else if (handler->handle) | |
920 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 921 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
01305d41 | 922 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
923 | } |
924 | ||
550b3aac | 925 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
926 | { |
927 | u8 value = 0; | |
c2cf5769 LZ |
928 | int result; |
929 | acpi_status status; | |
01305d41 | 930 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
931 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
932 | .wdata = NULL, .rdata = &value, | |
933 | .wlen = 0, .rlen = 1}; | |
3eba563e | 934 | |
550b3aac LZ |
935 | /* |
936 | * Query the EC to find out which _Qxx method we need to evaluate. | |
937 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
938 | * bit to be cleared (and thus clearing the interrupt source). | |
939 | */ | |
940 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
941 | if (result) |
942 | return result; | |
550b3aac LZ |
943 | if (data) |
944 | *data = value; | |
945 | if (!value) | |
946 | return -ENODATA; | |
3eba563e | 947 | |
550b3aac | 948 | mutex_lock(&ec->mutex); |
837012ed AS |
949 | list_for_each_entry(handler, &ec->list, node) { |
950 | if (value == handler->query_bit) { | |
951 | /* have custom handler for this bit */ | |
01305d41 | 952 | handler = acpi_ec_get_query_handler(handler); |
3535a3c1 LZ |
953 | ec_dbg_evt("Query(0x%02x) scheduled", |
954 | handler->query_bit); | |
c2cf5769 | 955 | status = acpi_os_execute((handler->func) ? |
f5347867 | 956 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 957 | acpi_ec_run, handler); |
c2cf5769 LZ |
958 | if (ACPI_FAILURE(status)) |
959 | result = -EBUSY; | |
960 | break; | |
837012ed AS |
961 | } |
962 | } | |
550b3aac | 963 | mutex_unlock(&ec->mutex); |
c2cf5769 | 964 | return result; |
a62e8f19 AS |
965 | } |
966 | ||
9d8993be | 967 | static void acpi_ec_event_handler(struct work_struct *work) |
a62e8f19 | 968 | { |
9d8993be | 969 | unsigned long flags; |
74443bbe | 970 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 971 | |
9d8993be LZ |
972 | ec_dbg_evt("Event started"); |
973 | ||
974 | spin_lock_irqsave(&ec->lock, flags); | |
975 | while (ec->nr_pending_queries) { | |
976 | spin_unlock_irqrestore(&ec->lock, flags); | |
977 | (void)acpi_ec_query(ec, NULL); | |
978 | spin_lock_irqsave(&ec->lock, flags); | |
979 | ec->nr_pending_queries--; | |
980 | } | |
981 | spin_unlock_irqrestore(&ec->lock, flags); | |
982 | ||
983 | ec_dbg_evt("Event stopped"); | |
45bea155 | 984 | } |
1da177e4 | 985 | |
8b6cd8ad LM |
986 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
987 | u32 gpe_number, void *data) | |
1da177e4 | 988 | { |
f92fca00 | 989 | unsigned long flags; |
3d02b90b | 990 | struct acpi_ec *ec = data; |
7c6db4e0 | 991 | |
f92fca00 | 992 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 993 | advance_transaction(ec); |
c0d65341 | 994 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 995 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
996 | } |
997 | ||
1da177e4 | 998 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
999 | * Address Space Management |
1000 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 1001 | |
1da177e4 | 1002 | static acpi_status |
5b7734b4 | 1003 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 1004 | u32 bits, u64 *value64, |
50526df6 | 1005 | void *handler_context, void *region_context) |
1da177e4 | 1006 | { |
3d02b90b | 1007 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
1008 | int result = 0, i, bytes = bits / 8; |
1009 | u8 *value = (u8 *)value64; | |
1da177e4 | 1010 | |
1da177e4 | 1011 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 1012 | return AE_BAD_PARAMETER; |
1da177e4 | 1013 | |
5b7734b4 | 1014 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 1015 | return AE_BAD_PARAMETER; |
1da177e4 | 1016 | |
15de603b | 1017 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1018 | acpi_ec_burst_enable(ec); |
b3b233c7 | 1019 | |
dadf28a1 AS |
1020 | for (i = 0; i < bytes; ++i, ++address, ++value) |
1021 | result = (function == ACPI_READ) ? | |
1022 | acpi_ec_read(ec, address, value) : | |
1023 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1024 | |
15de603b | 1025 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1026 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1027 | |
1da177e4 LT |
1028 | switch (result) { |
1029 | case -EINVAL: | |
d550d98d | 1030 | return AE_BAD_PARAMETER; |
1da177e4 | 1031 | case -ENODEV: |
d550d98d | 1032 | return AE_NOT_FOUND; |
1da177e4 | 1033 | case -ETIME: |
d550d98d | 1034 | return AE_TIME; |
1da177e4 | 1035 | default: |
d550d98d | 1036 | return AE_OK; |
1da177e4 | 1037 | } |
1da177e4 LT |
1038 | } |
1039 | ||
1da177e4 | 1040 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1041 | * Driver Interface |
1042 | * -------------------------------------------------------------------------- */ | |
1043 | ||
c0900c35 AS |
1044 | static acpi_status |
1045 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1046 | ||
c0900c35 AS |
1047 | static struct acpi_ec *make_acpi_ec(void) |
1048 | { | |
1049 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1050 | |
c0900c35 AS |
1051 | if (!ec) |
1052 | return NULL; | |
37d11391 | 1053 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 1054 | mutex_init(&ec->mutex); |
c0900c35 | 1055 | init_waitqueue_head(&ec->wait); |
837012ed | 1056 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1057 | spin_lock_init(&ec->lock); |
9d8993be | 1058 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
d8d031a6 | 1059 | ec->timestamp = jiffies; |
c0900c35 AS |
1060 | return ec; |
1061 | } | |
837012ed | 1062 | |
c019b193 AS |
1063 | static acpi_status |
1064 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1065 | void *context, void **return_value) | |
1066 | { | |
0175d562 LM |
1067 | char node_name[5]; |
1068 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1069 | struct acpi_ec *ec = context; |
1070 | int value = 0; | |
0175d562 LM |
1071 | acpi_status status; |
1072 | ||
1073 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1074 | ||
7a73e60e | 1075 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1076 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1077 | return AE_OK; |
1078 | } | |
1079 | ||
cd8c93a4 AS |
1080 | static acpi_status |
1081 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1082 | { |
cd8c93a4 | 1083 | acpi_status status; |
d21cf3c1 | 1084 | unsigned long long tmp = 0; |
cd8c93a4 | 1085 | struct acpi_ec *ec = context; |
a5032bfd AS |
1086 | |
1087 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1088 | ec->command_addr = ec->data_addr = 0; | |
1089 | ||
cd8c93a4 AS |
1090 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1091 | ec_parse_io_ports, ec); | |
1092 | if (ACPI_FAILURE(status)) | |
1093 | return status; | |
837012ed AS |
1094 | |
1095 | /* Get GPE bit assignment (EC events). */ | |
1096 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1097 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1098 | if (ACPI_FAILURE(status)) |
1099 | return status; | |
27663c58 | 1100 | ec->gpe = tmp; |
837012ed | 1101 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1102 | tmp = 0; |
27663c58 MW |
1103 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1104 | ec->global_lock = tmp; | |
837012ed | 1105 | ec->handle = handle; |
cd8c93a4 | 1106 | return AE_CTRL_TERMINATE; |
837012ed AS |
1107 | } |
1108 | ||
5efc5476 BH |
1109 | static int ec_install_handlers(struct acpi_ec *ec) |
1110 | { | |
1111 | acpi_status status; | |
7a73e60e | 1112 | |
5efc5476 BH |
1113 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1114 | return 0; | |
ca37bfdf | 1115 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1116 | ACPI_GPE_EDGE_TRIGGERED, |
1117 | &acpi_ec_gpe_handler, ec); | |
1118 | if (ACPI_FAILURE(status)) | |
1119 | return -ENODEV; | |
9630bdd9 | 1120 | |
ad479e7f | 1121 | acpi_ec_start(ec, false); |
5efc5476 BH |
1122 | status = acpi_install_address_space_handler(ec->handle, |
1123 | ACPI_ADR_SPACE_EC, | |
1124 | &acpi_ec_space_handler, | |
1125 | NULL, ec); | |
1126 | if (ACPI_FAILURE(status)) { | |
1127 | if (status == AE_NOT_FOUND) { | |
1128 | /* | |
1129 | * Maybe OS fails in evaluating the _REG object. | |
1130 | * The AE_NOT_FOUND error will be ignored and OS | |
1131 | * continue to initialize EC. | |
1132 | */ | |
16a26e85 | 1133 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1134 | " of EC device. Broken bios is suspected.\n"); |
1135 | } else { | |
ad479e7f | 1136 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1137 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1138 | &acpi_ec_gpe_handler); | |
1139 | return -ENODEV; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1144 | return 0; | |
1145 | } | |
1146 | ||
4c611060 AS |
1147 | static void ec_remove_handlers(struct acpi_ec *ec) |
1148 | { | |
1741acea LZ |
1149 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1150 | return; | |
ad479e7f | 1151 | acpi_ec_stop(ec, false); |
4c611060 AS |
1152 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1153 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1154 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1155 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1156 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1157 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1158 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1159 | } |
1160 | ||
703959d4 | 1161 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1162 | { |
703959d4 | 1163 | struct acpi_ec *ec = NULL; |
d02be047 | 1164 | int ret; |
45bea155 | 1165 | |
c0900c35 AS |
1166 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1167 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1168 | ||
4c611060 | 1169 | /* Check for boot EC */ |
ce52ddf5 AS |
1170 | if (boot_ec && |
1171 | (boot_ec->handle == device->handle || | |
1172 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1173 | ec = boot_ec; | |
1174 | boot_ec = NULL; | |
1175 | } else { | |
1176 | ec = make_acpi_ec(); | |
1177 | if (!ec) | |
1178 | return -ENOMEM; | |
a5032bfd AS |
1179 | } |
1180 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1181 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1182 | kfree(ec); |
1183 | return -EINVAL; | |
4c611060 AS |
1184 | } |
1185 | ||
ce52ddf5 AS |
1186 | /* Find and register all query methods */ |
1187 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1188 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1189 | |
4c611060 AS |
1190 | if (!first_ec) |
1191 | first_ec = ec; | |
db89b4f0 | 1192 | device->driver_data = ec; |
de4f1046 | 1193 | |
d6795fe3 AK |
1194 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1195 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1196 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1197 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1198 | |
16a26e85 | 1199 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1200 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1201 | |
1202 | ret = ec_install_handlers(ec); | |
1203 | ||
1c832b3e LT |
1204 | /* Reprobe devices depending on the EC */ |
1205 | acpi_walk_dep_device_list(ec->handle); | |
1206 | ||
5efc5476 | 1207 | /* EC is fully operational, allow queries */ |
37d11391 | 1208 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1209 | |
1210 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1211 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1212 | acpi_ec_clear(ec); |
5efc5476 | 1213 | return ret; |
1da177e4 LT |
1214 | } |
1215 | ||
51fac838 | 1216 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1217 | { |
01f22462 | 1218 | struct acpi_ec *ec; |
07ddf768 | 1219 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1220 | |
1da177e4 | 1221 | if (!device) |
d550d98d | 1222 | return -EINVAL; |
1da177e4 LT |
1223 | |
1224 | ec = acpi_driver_data(device); | |
cf745ec7 | 1225 | ec_remove_handlers(ec); |
f351d027 | 1226 | mutex_lock(&ec->mutex); |
07ddf768 | 1227 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1228 | list_del(&handler->node); |
1229 | kfree(handler); | |
1230 | } | |
f351d027 | 1231 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1232 | release_region(ec->data_addr, 1); |
1233 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1234 | device->driver_data = NULL; |
d033879c | 1235 | if (ec == first_ec) |
c0900c35 | 1236 | first_ec = NULL; |
4c611060 | 1237 | kfree(ec); |
d550d98d | 1238 | return 0; |
1da177e4 LT |
1239 | } |
1240 | ||
1da177e4 | 1241 | static acpi_status |
c0900c35 | 1242 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1243 | { |
3d02b90b | 1244 | struct acpi_ec *ec = context; |
1da177e4 | 1245 | |
01f22462 | 1246 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1247 | return AE_OK; |
1da177e4 LT |
1248 | |
1249 | /* | |
1250 | * The first address region returned is the data port, and | |
1251 | * the second address region returned is the status/command | |
1252 | * port. | |
1253 | */ | |
de4f1046 | 1254 | if (ec->data_addr == 0) |
6ffb221a | 1255 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1256 | else if (ec->command_addr == 0) |
6ffb221a | 1257 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1258 | else |
1da177e4 | 1259 | return AE_CTRL_TERMINATE; |
1da177e4 | 1260 | |
1da177e4 LT |
1261 | return AE_OK; |
1262 | } | |
1263 | ||
c04209a7 AS |
1264 | int __init acpi_boot_ec_enable(void) |
1265 | { | |
7c6db4e0 | 1266 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1267 | return 0; |
1268 | if (!ec_install_handlers(boot_ec)) { | |
1269 | first_ec = boot_ec; | |
1270 | return 0; | |
1271 | } | |
1272 | return -EFAULT; | |
1273 | } | |
1274 | ||
223883b7 AS |
1275 | static const struct acpi_device_id ec_device_ids[] = { |
1276 | {"PNP0C09", 0}, | |
1277 | {"", 0}, | |
1278 | }; | |
1279 | ||
478fa03b AS |
1280 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1281 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1282 | { | |
1283 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1284 | return 0; | |
1285 | } | |
1286 | ||
0adf3c74 AS |
1287 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1288 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1289 | { | |
1290 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1291 | return 0; | |
1292 | } | |
1293 | ||
79149001 LZ |
1294 | /* |
1295 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1296 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1297 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1298 | */ | |
1299 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1300 | { | |
1301 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1302 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1303 | return 0; | |
1304 | } | |
1305 | ||
ad332c8a KC |
1306 | /* |
1307 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1308 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1309 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1310 | * | |
1311 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1312 | * | |
1313 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1314 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1315 | * behaviour is not known at this time. | |
1316 | * | |
1317 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1318 | * however it is very likely that other Samsung models are affected. | |
1319 | * | |
1320 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1321 | * should be harmless. | |
1322 | */ | |
1323 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1324 | { | |
1325 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1326 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1327 | return 0; | |
1328 | } | |
1329 | ||
6cef7497 | 1330 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1331 | { |
1332 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1333 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1334 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 | 1335 | { |
3174abcf LZ |
1336 | ec_validate_ecdt, "MSI MS-171F", { |
1337 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), | |
1338 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, | |
777cb382 | 1339 | { |
0adf3c74 AS |
1340 | ec_validate_ecdt, "ASUS hardware", { |
1341 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1342 | { |
1343 | ec_validate_ecdt, "ASUS hardware", { | |
1344 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 | 1345 | { |
eff9a4b6 LT |
1346 | ec_skip_dsdt_scan, "HP Folio 13", { |
1347 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1348 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1349 | { |
1350 | ec_validate_ecdt, "ASUS hardware", { | |
1351 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1352 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1353 | { |
1354 | ec_clear_on_resume, "Samsung hardware", { | |
1355 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1356 | { |
1357 | ec_flag_query_handshake, "Acer hardware", { | |
1358 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1359 | {}, |
1360 | }; | |
1361 | ||
c0900c35 AS |
1362 | int __init acpi_ec_ecdt_probe(void) |
1363 | { | |
c0900c35 | 1364 | acpi_status status; |
c6cb0e87 | 1365 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1366 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1367 | |
d66d969d AS |
1368 | boot_ec = make_acpi_ec(); |
1369 | if (!boot_ec) | |
c0900c35 AS |
1370 | return -ENOMEM; |
1371 | /* | |
1372 | * Generate a boot ec context | |
1373 | */ | |
0adf3c74 | 1374 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1375 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1376 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1377 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1378 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1379 | boot_ec->command_addr = ecdt_ptr->control.address; |
1380 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1381 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1382 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1383 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1384 | &boot_ec->handle); | |
c6cb0e87 | 1385 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1386 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1387 | goto install; |
d6bd535d | 1388 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1389 | if (!saved_ec) |
1390 | return -ENOMEM; | |
c5279dee | 1391 | /* fall through */ |
cd8c93a4 | 1392 | } |
0adf3c74 | 1393 | |
ed4b197d CIK |
1394 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1395 | kfree(saved_ec); | |
478fa03b | 1396 | return -ENODEV; |
ed4b197d | 1397 | } |
478fa03b | 1398 | |
c5279dee AS |
1399 | /* This workaround is needed only on some broken machines, |
1400 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1401 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1402 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1403 | boot_ec, NULL); | |
1404 | /* Check that acpi_get_devices actually find something */ | |
1405 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1406 | goto error; | |
c6cb0e87 AS |
1407 | if (saved_ec) { |
1408 | /* try to find good ECDT from ASUSTek */ | |
1409 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1410 | saved_ec->data_addr != boot_ec->data_addr || | |
1411 | saved_ec->gpe != boot_ec->gpe || | |
1412 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1413 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1414 | "ECDT tables, which are very hard to workaround. " |
1415 | "Trying to use DSDT EC info instead. Please send " | |
1416 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1417 | kfree(saved_ec); | |
1418 | saved_ec = NULL; | |
1419 | } else { | |
1420 | /* We really need to limit this workaround, the only ASUS, | |
1421 | * which needs it, has fake EC._INI method, so use it as flag. | |
1422 | * Keep boot_ec struct as it will be needed soon. | |
1423 | */ | |
c6cb0e87 | 1424 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1425 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1426 | return -ENODEV; |
1427 | } | |
c5279dee AS |
1428 | install: |
1429 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1430 | first_ec = boot_ec; |
e8284321 | 1431 | return 0; |
d033879c | 1432 | } |
c5279dee | 1433 | error: |
d66d969d | 1434 | kfree(boot_ec); |
ed4b197d | 1435 | kfree(saved_ec); |
d66d969d | 1436 | boot_ec = NULL; |
1da177e4 LT |
1437 | return -ENODEV; |
1438 | } | |
1439 | ||
223883b7 AS |
1440 | static struct acpi_driver acpi_ec_driver = { |
1441 | .name = "ec", | |
1442 | .class = ACPI_EC_CLASS, | |
1443 | .ids = ec_device_ids, | |
1444 | .ops = { | |
1445 | .add = acpi_ec_add, | |
1446 | .remove = acpi_ec_remove, | |
223883b7 AS |
1447 | }, |
1448 | }; | |
1449 | ||
a5f820fe | 1450 | int __init acpi_ec_init(void) |
1da177e4 | 1451 | { |
50526df6 | 1452 | int result = 0; |
1da177e4 | 1453 | |
1da177e4 LT |
1454 | /* Now register the driver for the EC */ |
1455 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1456 | if (result < 0) |
d550d98d | 1457 | return -ENODEV; |
1da177e4 | 1458 | |
d550d98d | 1459 | return result; |
1da177e4 LT |
1460 | } |
1461 | ||
1da177e4 LT |
1462 | /* EC driver currently not unloadable */ |
1463 | #if 0 | |
50526df6 | 1464 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1465 | { |
1da177e4 LT |
1466 | |
1467 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1468 | } |
7843932a | 1469 | #endif /* 0 */ |