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 | ||
a520d52e FT |
95 | /* |
96 | * If the number of false interrupts per one transaction exceeds | |
97 | * this threshold, will think there is a GPE storm happened and | |
98 | * will disable the GPE for normal transaction. | |
99 | */ | |
100 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
101 | module_param(ec_storm_threshold, uint, 0644); | |
102 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
103 | ||
837012ed AS |
104 | struct acpi_ec_query_handler { |
105 | struct list_head node; | |
106 | acpi_ec_query_func func; | |
107 | acpi_handle handle; | |
108 | void *data; | |
109 | u8 query_bit; | |
01305d41 | 110 | struct kref kref; |
837012ed AS |
111 | }; |
112 | ||
8463200a | 113 | struct transaction { |
7c6db4e0 AS |
114 | const u8 *wdata; |
115 | u8 *rdata; | |
116 | unsigned short irq_count; | |
8463200a | 117 | u8 command; |
a2f93aea AS |
118 | u8 wi; |
119 | u8 ri; | |
7c6db4e0 AS |
120 | u8 wlen; |
121 | u8 rlen; | |
f92fca00 | 122 | u8 flags; |
7c6db4e0 AS |
123 | }; |
124 | ||
550b3aac | 125 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 126 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 127 | |
1195a098 TR |
128 | struct acpi_ec *boot_ec, *first_ec; |
129 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 130 | |
5423a0cb | 131 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 132 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 133 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 134 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 135 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 136 | |
3535a3c1 LZ |
137 | /* -------------------------------------------------------------------------- |
138 | * Logging/Debugging | |
139 | * -------------------------------------------------------------------------- */ | |
140 | ||
141 | /* | |
142 | * Splitters used by the developers to track the boundary of the EC | |
143 | * handling processes. | |
144 | */ | |
145 | #ifdef DEBUG | |
146 | #define EC_DBG_SEP " " | |
147 | #define EC_DBG_DRV "+++++" | |
148 | #define EC_DBG_STM "=====" | |
149 | #define EC_DBG_REQ "*****" | |
150 | #define EC_DBG_EVT "#####" | |
151 | #else | |
152 | #define EC_DBG_SEP "" | |
153 | #define EC_DBG_DRV | |
154 | #define EC_DBG_STM | |
155 | #define EC_DBG_REQ | |
156 | #define EC_DBG_EVT | |
157 | #endif | |
158 | ||
159 | #define ec_log_raw(fmt, ...) \ | |
160 | pr_info(fmt "\n", ##__VA_ARGS__) | |
161 | #define ec_dbg_raw(fmt, ...) \ | |
162 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
163 | #define ec_log(filter, fmt, ...) \ | |
164 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
165 | #define ec_dbg(filter, fmt, ...) \ | |
166 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
167 | ||
168 | #define ec_log_drv(fmt, ...) \ | |
169 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
170 | #define ec_dbg_drv(fmt, ...) \ | |
171 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
172 | #define ec_dbg_stm(fmt, ...) \ | |
173 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
174 | #define ec_dbg_req(fmt, ...) \ | |
175 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
176 | #define ec_dbg_evt(fmt, ...) \ | |
177 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
178 | #define ec_dbg_ref(ec, fmt, ...) \ |
179 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 180 | |
ad479e7f LZ |
181 | /* -------------------------------------------------------------------------- |
182 | * Device Flags | |
183 | * -------------------------------------------------------------------------- */ | |
184 | ||
185 | static bool acpi_ec_started(struct acpi_ec *ec) | |
186 | { | |
187 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
188 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
189 | } | |
190 | ||
9887d22a LZ |
191 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
192 | { | |
193 | return ec->reference_count == 1; | |
194 | } | |
195 | ||
1da177e4 | 196 | /* -------------------------------------------------------------------------- |
ca37bfdf | 197 | * EC Registers |
7a73e60e | 198 | * -------------------------------------------------------------------------- */ |
1da177e4 | 199 | |
6ffb221a | 200 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 201 | { |
3ebe08a7 | 202 | u8 x = inb(ec->command_addr); |
7a73e60e | 203 | |
3535a3c1 LZ |
204 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
205 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
206 | x, | |
207 | !!(x & ACPI_EC_FLAG_SCI), | |
208 | !!(x & ACPI_EC_FLAG_BURST), | |
209 | !!(x & ACPI_EC_FLAG_CMD), | |
210 | !!(x & ACPI_EC_FLAG_IBF), | |
211 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 212 | return x; |
451566f4 DT |
213 | } |
214 | ||
6ffb221a | 215 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 216 | { |
3ebe08a7 | 217 | u8 x = inb(ec->data_addr); |
7a73e60e | 218 | |
d8d031a6 | 219 | ec->timestamp = jiffies; |
3535a3c1 | 220 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 221 | return x; |
7c6db5e5 DS |
222 | } |
223 | ||
6ffb221a | 224 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 225 | { |
3535a3c1 | 226 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 227 | outb(command, ec->command_addr); |
d8d031a6 | 228 | ec->timestamp = jiffies; |
45bea155 LY |
229 | } |
230 | ||
6ffb221a | 231 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 232 | { |
3535a3c1 | 233 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 234 | outb(data, ec->data_addr); |
d8d031a6 | 235 | ec->timestamp = jiffies; |
703959d4 | 236 | } |
45bea155 | 237 | |
e34c0e2b LZ |
238 | #ifdef DEBUG |
239 | static const char *acpi_ec_cmd_string(u8 cmd) | |
240 | { | |
241 | switch (cmd) { | |
242 | case 0x80: | |
243 | return "RD_EC"; | |
244 | case 0x81: | |
245 | return "WR_EC"; | |
246 | case 0x82: | |
247 | return "BE_EC"; | |
248 | case 0x83: | |
249 | return "BD_EC"; | |
250 | case 0x84: | |
251 | return "QR_EC"; | |
252 | } | |
253 | return "UNKNOWN"; | |
254 | } | |
255 | #else | |
256 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
257 | #endif | |
258 | ||
ca37bfdf LZ |
259 | /* -------------------------------------------------------------------------- |
260 | * GPE Registers | |
261 | * -------------------------------------------------------------------------- */ | |
262 | ||
263 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
264 | { | |
265 | acpi_event_status gpe_status = 0; | |
266 | ||
267 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 268 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
269 | } |
270 | ||
271 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
272 | { | |
273 | if (open) | |
274 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
275 | else { |
276 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 277 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 278 | } |
ca37bfdf LZ |
279 | if (acpi_ec_is_gpe_raised(ec)) { |
280 | /* | |
281 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
282 | * software need to manually trigger a pseudo GPE event on | |
283 | * EN=1 writes. | |
284 | */ | |
3535a3c1 | 285 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
286 | advance_transaction(ec); |
287 | } | |
288 | } | |
289 | ||
290 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
291 | { | |
292 | if (close) | |
293 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
294 | else { |
295 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 296 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 297 | } |
ca37bfdf LZ |
298 | } |
299 | ||
300 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
301 | { | |
302 | /* | |
303 | * GPE STS is a W1C register, which means: | |
304 | * 1. Software can clear it without worrying about clearing other | |
305 | * GPEs' STS bits when the hardware sets them in parallel. | |
306 | * 2. As long as software can ensure only clearing it when it is | |
307 | * set, hardware won't set it in parallel. | |
308 | * So software can clear GPE in any contexts. | |
309 | * Warning: do not move the check into advance_transaction() as the | |
310 | * EC commands will be sent without GPE raised. | |
311 | */ | |
312 | if (!acpi_ec_is_gpe_raised(ec)) | |
313 | return; | |
314 | acpi_clear_gpe(NULL, ec->gpe); | |
315 | } | |
316 | ||
317 | /* -------------------------------------------------------------------------- | |
318 | * Transaction Management | |
319 | * -------------------------------------------------------------------------- */ | |
320 | ||
9887d22a LZ |
321 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
322 | { | |
323 | ec->reference_count++; | |
324 | if (ec->reference_count == 1) | |
325 | acpi_ec_enable_gpe(ec, true); | |
326 | } | |
327 | ||
328 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
329 | { | |
330 | bool flushed = false; | |
331 | ||
332 | ec->reference_count--; | |
333 | if (ec->reference_count == 0) | |
334 | acpi_ec_disable_gpe(ec, true); | |
335 | flushed = acpi_ec_flushed(ec); | |
336 | if (flushed) | |
337 | wake_up(&ec->wait); | |
338 | } | |
339 | ||
e1d4d90f LZ |
340 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
341 | { | |
342 | if (!test_bit(flag, &ec->flags)) { | |
343 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 344 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
345 | set_bit(flag, &ec->flags); |
346 | } | |
347 | } | |
348 | ||
349 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
350 | { | |
351 | if (test_bit(flag, &ec->flags)) { | |
352 | clear_bit(flag, &ec->flags); | |
353 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 354 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
355 | } |
356 | } | |
357 | ||
9887d22a LZ |
358 | /* |
359 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
360 | * the flush operation is not in | |
361 | * progress | |
362 | * @ec: the EC device | |
363 | * | |
364 | * This function must be used before taking a new action that should hold | |
365 | * the reference count. If this function returns false, then the action | |
366 | * must be discarded or it will prevent the flush operation from being | |
367 | * completed. | |
368 | */ | |
37d11391 | 369 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 370 | { |
37d11391 RW |
371 | if (!acpi_ec_started(ec)) |
372 | return false; | |
9887d22a LZ |
373 | acpi_ec_submit_request(ec); |
374 | return true; | |
375 | } | |
376 | ||
37d11391 | 377 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 378 | { |
37d11391 | 379 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
3535a3c1 | 380 | ec_dbg_req("Event started"); |
74443bbe LZ |
381 | schedule_work(&ec->work); |
382 | } | |
383 | } | |
384 | ||
37d11391 | 385 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe LZ |
386 | { |
387 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
37d11391 | 388 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
3535a3c1 | 389 | ec_dbg_req("Event stopped"); |
74443bbe LZ |
390 | } |
391 | } | |
392 | ||
d8d031a6 LZ |
393 | static int ec_transaction_polled(struct acpi_ec *ec) |
394 | { | |
395 | unsigned long flags; | |
396 | int ret = 0; | |
397 | ||
398 | spin_lock_irqsave(&ec->lock, flags); | |
399 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
400 | ret = 1; | |
401 | spin_unlock_irqrestore(&ec->lock, flags); | |
402 | return ret; | |
403 | } | |
404 | ||
f92fca00 | 405 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 406 | { |
7c6db4e0 AS |
407 | unsigned long flags; |
408 | int ret = 0; | |
7a73e60e | 409 | |
f351d027 | 410 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 411 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 412 | ret = 1; |
f351d027 | 413 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 414 | return ret; |
45bea155 | 415 | } |
451566f4 | 416 | |
0c78808f | 417 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 418 | { |
36b15875 | 419 | struct transaction *t; |
66b42b78 | 420 | u8 status; |
c0d65341 | 421 | bool wakeup = false; |
b76b51ba | 422 | |
3535a3c1 LZ |
423 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
424 | smp_processor_id()); | |
ca37bfdf LZ |
425 | /* |
426 | * By always clearing STS before handling all indications, we can | |
427 | * ensure a hardware STS 0->1 change after this clearing can always | |
428 | * trigger a GPE interrupt. | |
429 | */ | |
430 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 431 | status = acpi_ec_read_status(ec); |
36b15875 | 432 | t = ec->curr; |
b76b51ba | 433 | if (!t) |
f92fca00 LZ |
434 | goto err; |
435 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
436 | if (t->wlen > t->wi) { | |
437 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
438 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
439 | else | |
440 | goto err; | |
441 | } else if (t->rlen > t->ri) { | |
442 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
443 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 444 | if (t->rlen == t->ri) { |
f92fca00 | 445 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 446 | if (t->command == ACPI_EC_COMMAND_QUERY) |
3535a3c1 LZ |
447 | ec_dbg_req("Command(%s) hardware completion", |
448 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
449 | wakeup = true; |
450 | } | |
f92fca00 LZ |
451 | } else |
452 | goto err; | |
453 | } else if (t->wlen == t->wi && | |
c0d65341 | 454 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 455 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
456 | wakeup = true; |
457 | } | |
0c78808f | 458 | goto out; |
f92fca00 | 459 | } else { |
79149001 LZ |
460 | if (EC_FLAGS_QUERY_HANDSHAKE && |
461 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
462 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
463 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 464 | acpi_ec_complete_query(ec); |
3afcf2ec LZ |
465 | t->rdata[t->ri++] = 0x00; |
466 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
3535a3c1 LZ |
467 | ec_dbg_req("Command(%s) software completion", |
468 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
469 | wakeup = true; |
470 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
471 | acpi_ec_write_cmd(ec, t->command); |
472 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 473 | acpi_ec_complete_query(ec); |
7c6db4e0 | 474 | } else |
dd15f8c4 | 475 | goto err; |
0c78808f | 476 | goto out; |
f92fca00 | 477 | } |
dd15f8c4 | 478 | err: |
a3cd8d27 FT |
479 | /* |
480 | * If SCI bit is set, then don't think it's a false IRQ | |
481 | * otherwise will take a not handled IRQ as a false one. | |
482 | */ | |
f92fca00 | 483 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
484 | if (in_interrupt() && t) { |
485 | if (t->irq_count < ec_storm_threshold) | |
486 | ++t->irq_count; | |
487 | /* Allow triggering on 0 threshold */ | |
488 | if (t->irq_count == ec_storm_threshold) | |
489 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
490 | } | |
f92fca00 | 491 | } |
0c78808f | 492 | out: |
74443bbe | 493 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 494 | acpi_ec_submit_query(ec); |
0c78808f LZ |
495 | if (wakeup && in_interrupt()) |
496 | wake_up(&ec->wait); | |
f92fca00 | 497 | } |
a3cd8d27 | 498 | |
f92fca00 LZ |
499 | static void start_transaction(struct acpi_ec *ec) |
500 | { | |
501 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
502 | ec->curr->flags = 0; | |
d8d031a6 LZ |
503 | } |
504 | ||
505 | static int ec_guard(struct acpi_ec *ec) | |
506 | { | |
507 | unsigned long guard = usecs_to_jiffies(ACPI_EC_UDELAY_POLL); | |
508 | unsigned long timeout = ec->timestamp + guard; | |
509 | ||
510 | do { | |
511 | if (EC_FLAGS_MSI) { | |
512 | /* Perform busy polling */ | |
513 | if (ec_transaction_completed(ec)) | |
514 | return 0; | |
515 | udelay(jiffies_to_usecs(guard)); | |
516 | } else { | |
517 | /* | |
518 | * Perform wait polling | |
519 | * | |
520 | * The following check is there to keep the old | |
521 | * logic - no inter-transaction guarding for the | |
522 | * wait polling mode. | |
523 | */ | |
524 | if (!ec_transaction_polled(ec)) | |
525 | break; | |
526 | if (wait_event_timeout(ec->wait, | |
527 | ec_transaction_completed(ec), | |
528 | guard)) | |
529 | return 0; | |
530 | } | |
531 | /* Guard the register accesses for the polling modes */ | |
532 | } while (time_before(jiffies, timeout)); | |
533 | return -ETIME; | |
845625cd | 534 | } |
03d1d99c | 535 | |
7c6db4e0 AS |
536 | static int ec_poll(struct acpi_ec *ec) |
537 | { | |
2a84cb98 | 538 | unsigned long flags; |
28fe5c82 | 539 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 540 | |
2a84cb98 AS |
541 | while (repeat--) { |
542 | unsigned long delay = jiffies + | |
7a18e96d | 543 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 544 | do { |
d8d031a6 LZ |
545 | if (!ec_guard(ec)) |
546 | return 0; | |
f92fca00 | 547 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 548 | advance_transaction(ec); |
f92fca00 | 549 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 550 | } while (time_before(jiffies, delay)); |
16a26e85 | 551 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 552 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 553 | start_transaction(ec); |
f351d027 | 554 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 555 | } |
b77d81b2 | 556 | return -ETIME; |
1da177e4 LT |
557 | } |
558 | ||
8463200a | 559 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 560 | struct transaction *t) |
45bea155 | 561 | { |
7c6db4e0 | 562 | unsigned long tmp; |
7c6db4e0 | 563 | int ret = 0; |
7a73e60e | 564 | |
7c6db4e0 | 565 | /* start transaction */ |
f351d027 | 566 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 567 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 568 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
569 | ret = -EINVAL; |
570 | goto unlock; | |
571 | } | |
770970f0 | 572 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 573 | /* following two actions should be kept atomic */ |
8463200a | 574 | ec->curr = t; |
3535a3c1 | 575 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 576 | start_transaction(ec); |
df9ff918 | 577 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 578 | |
df9ff918 | 579 | ret = ec_poll(ec); |
d8d031a6 | 580 | |
df9ff918 | 581 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
582 | if (t->irq_count == ec_storm_threshold) |
583 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 584 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 585 | ec->curr = NULL; |
9887d22a LZ |
586 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
587 | acpi_ec_complete_request(ec); | |
770970f0 | 588 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 589 | unlock: |
f351d027 | 590 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
591 | return ret; |
592 | } | |
593 | ||
2a84cb98 | 594 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 595 | { |
d7a76e4c | 596 | int status; |
50526df6 | 597 | u32 glk; |
7a73e60e | 598 | |
8463200a | 599 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 600 | return -EINVAL; |
8463200a AS |
601 | if (t->rdata) |
602 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 603 | |
f351d027 | 604 | mutex_lock(&ec->mutex); |
703959d4 | 605 | if (ec->global_lock) { |
1da177e4 | 606 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 607 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
608 | status = -ENODEV; |
609 | goto unlock; | |
c24e912b | 610 | } |
1da177e4 | 611 | } |
a62e8f19 | 612 | |
2a84cb98 | 613 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 614 | |
703959d4 | 615 | if (ec->global_lock) |
1da177e4 | 616 | acpi_release_global_lock(glk); |
7c6db4e0 | 617 | unlock: |
f351d027 | 618 | mutex_unlock(&ec->mutex); |
d550d98d | 619 | return status; |
1da177e4 LT |
620 | } |
621 | ||
8a383ef0 | 622 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
623 | { |
624 | u8 d; | |
8463200a AS |
625 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
626 | .wdata = NULL, .rdata = &d, | |
627 | .wlen = 0, .rlen = 1}; | |
628 | ||
2a84cb98 | 629 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
630 | } |
631 | ||
8a383ef0 | 632 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 633 | { |
8463200a AS |
634 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
635 | .wdata = NULL, .rdata = NULL, | |
636 | .wlen = 0, .rlen = 0}; | |
637 | ||
7c6db4e0 | 638 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 639 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
640 | } |
641 | ||
7a73e60e | 642 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
643 | { |
644 | int result; | |
645 | u8 d; | |
8463200a AS |
646 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
647 | .wdata = &address, .rdata = &d, | |
648 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 649 | |
2a84cb98 | 650 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
651 | *data = d; |
652 | return result; | |
653 | } | |
6ffb221a | 654 | |
3576cf61 DS |
655 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
656 | { | |
6ccedb10 | 657 | u8 wdata[2] = { address, data }; |
8463200a AS |
658 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
659 | .wdata = wdata, .rdata = NULL, | |
660 | .wlen = 2, .rlen = 0}; | |
661 | ||
2a84cb98 | 662 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
663 | } |
664 | ||
b76b51ba | 665 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 666 | { |
1da177e4 | 667 | int err; |
6ffb221a | 668 | u8 temp_data; |
1da177e4 LT |
669 | |
670 | if (!first_ec) | |
671 | return -ENODEV; | |
672 | ||
d033879c | 673 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
674 | |
675 | if (!err) { | |
676 | *val = temp_data; | |
677 | return 0; | |
7a73e60e LZ |
678 | } |
679 | return err; | |
1da177e4 LT |
680 | } |
681 | EXPORT_SYMBOL(ec_read); | |
682 | ||
50526df6 | 683 | int ec_write(u8 addr, u8 val) |
1da177e4 | 684 | { |
1da177e4 LT |
685 | int err; |
686 | ||
687 | if (!first_ec) | |
688 | return -ENODEV; | |
689 | ||
d033879c | 690 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
691 | |
692 | return err; | |
693 | } | |
694 | EXPORT_SYMBOL(ec_write); | |
695 | ||
616362de | 696 | int ec_transaction(u8 command, |
7a73e60e LZ |
697 | const u8 *wdata, unsigned wdata_len, |
698 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 699 | { |
8463200a AS |
700 | struct transaction t = {.command = command, |
701 | .wdata = wdata, .rdata = rdata, | |
702 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 703 | |
d7a76e4c LP |
704 | if (!first_ec) |
705 | return -ENODEV; | |
45bea155 | 706 | |
2a84cb98 | 707 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 708 | } |
ab9e43c6 LP |
709 | EXPORT_SYMBOL(ec_transaction); |
710 | ||
3e2abc5a SF |
711 | /* Get the handle to the EC device */ |
712 | acpi_handle ec_get_handle(void) | |
713 | { | |
714 | if (!first_ec) | |
715 | return NULL; | |
716 | return first_ec->handle; | |
717 | } | |
3e2abc5a SF |
718 | EXPORT_SYMBOL(ec_get_handle); |
719 | ||
ad332c8a | 720 | /* |
3eba563e | 721 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
722 | * Run with locked ec mutex. |
723 | */ | |
724 | static void acpi_ec_clear(struct acpi_ec *ec) | |
725 | { | |
726 | int i, status; | |
727 | u8 value = 0; | |
728 | ||
729 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 730 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
731 | if (status || !value) |
732 | break; | |
733 | } | |
734 | ||
735 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
736 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
737 | else | |
738 | pr_info("%d stale EC events cleared\n", i); | |
739 | } | |
740 | ||
ad479e7f LZ |
741 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
742 | { | |
743 | unsigned long flags; | |
744 | ||
745 | spin_lock_irqsave(&ec->lock, flags); | |
746 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 747 | ec_dbg_drv("Starting EC"); |
9887d22a | 748 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 749 | if (!resuming) { |
9887d22a | 750 | acpi_ec_submit_request(ec); |
770970f0 LZ |
751 | ec_dbg_ref(ec, "Increase driver"); |
752 | } | |
3535a3c1 | 753 | ec_log_drv("EC started"); |
ad479e7f LZ |
754 | } |
755 | spin_unlock_irqrestore(&ec->lock, flags); | |
756 | } | |
757 | ||
9887d22a LZ |
758 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
759 | { | |
760 | unsigned long flags; | |
761 | bool flushed; | |
762 | ||
763 | spin_lock_irqsave(&ec->lock, flags); | |
764 | flushed = acpi_ec_flushed(ec); | |
765 | spin_unlock_irqrestore(&ec->lock, flags); | |
766 | return flushed; | |
767 | } | |
768 | ||
ad479e7f LZ |
769 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
770 | { | |
771 | unsigned long flags; | |
772 | ||
773 | spin_lock_irqsave(&ec->lock, flags); | |
774 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 775 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 776 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
777 | spin_unlock_irqrestore(&ec->lock, flags); |
778 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
779 | spin_lock_irqsave(&ec->lock, flags); | |
780 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 781 | if (!suspending) { |
9887d22a | 782 | acpi_ec_complete_request(ec); |
770970f0 LZ |
783 | ec_dbg_ref(ec, "Decrease driver"); |
784 | } | |
ad479e7f LZ |
785 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
786 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 787 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
788 | } |
789 | spin_unlock_irqrestore(&ec->lock, flags); | |
790 | } | |
791 | ||
fe955682 | 792 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
793 | { |
794 | struct acpi_ec *ec = first_ec; | |
795 | ||
796 | if (!ec) | |
797 | return; | |
798 | ||
f351d027 | 799 | mutex_lock(&ec->mutex); |
f6bb13aa | 800 | /* Prevent transactions from being carried out */ |
ad479e7f | 801 | acpi_ec_stop(ec, true); |
f351d027 | 802 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
803 | } |
804 | ||
fe955682 | 805 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
806 | { |
807 | struct acpi_ec *ec = first_ec; | |
808 | ||
809 | if (!ec) | |
810 | return; | |
811 | ||
f6bb13aa | 812 | /* Allow transactions to be carried out again */ |
ad479e7f | 813 | acpi_ec_start(ec, true); |
ad332c8a KC |
814 | |
815 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
816 | acpi_ec_clear(ec); | |
f6bb13aa RW |
817 | } |
818 | ||
fe955682 | 819 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
820 | { |
821 | /* | |
822 | * Allow transactions to happen again (this function is called from | |
823 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
824 | */ | |
825 | if (first_ec) | |
ad479e7f | 826 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
827 | } |
828 | ||
1da177e4 LT |
829 | /* -------------------------------------------------------------------------- |
830 | Event Management | |
831 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
832 | static struct acpi_ec_query_handler * |
833 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
834 | { | |
835 | if (handler) | |
836 | kref_get(&handler->kref); | |
837 | return handler; | |
838 | } | |
839 | ||
840 | static void acpi_ec_query_handler_release(struct kref *kref) | |
841 | { | |
842 | struct acpi_ec_query_handler *handler = | |
843 | container_of(kref, struct acpi_ec_query_handler, kref); | |
844 | ||
845 | kfree(handler); | |
846 | } | |
847 | ||
848 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
849 | { | |
850 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
851 | } | |
852 | ||
837012ed AS |
853 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
854 | acpi_handle handle, acpi_ec_query_func func, | |
855 | void *data) | |
856 | { | |
857 | struct acpi_ec_query_handler *handler = | |
858 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 859 | |
837012ed AS |
860 | if (!handler) |
861 | return -ENOMEM; | |
862 | ||
863 | handler->query_bit = query_bit; | |
864 | handler->handle = handle; | |
865 | handler->func = func; | |
866 | handler->data = data; | |
f351d027 | 867 | mutex_lock(&ec->mutex); |
01305d41 | 868 | kref_init(&handler->kref); |
30c08574 | 869 | list_add(&handler->node, &ec->list); |
f351d027 | 870 | mutex_unlock(&ec->mutex); |
837012ed AS |
871 | return 0; |
872 | } | |
837012ed AS |
873 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
874 | ||
875 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
876 | { | |
1544fdbc | 877 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 878 | LIST_HEAD(free_list); |
7a73e60e | 879 | |
f351d027 | 880 | mutex_lock(&ec->mutex); |
1544fdbc | 881 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 882 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
883 | list_del_init(&handler->node); |
884 | list_add(&handler->node, &free_list); | |
837012ed AS |
885 | } |
886 | } | |
f351d027 | 887 | mutex_unlock(&ec->mutex); |
6b5eab54 | 888 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 889 | acpi_ec_put_query_handler(handler); |
837012ed | 890 | } |
837012ed | 891 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 892 | |
a62e8f19 | 893 | static void acpi_ec_run(void *cxt) |
45bea155 | 894 | { |
a62e8f19 | 895 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 896 | |
a62e8f19 | 897 | if (!handler) |
e41334c0 | 898 | return; |
3535a3c1 | 899 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
900 | if (handler->func) |
901 | handler->func(handler->data); | |
902 | else if (handler->handle) | |
903 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 904 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
01305d41 | 905 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
906 | } |
907 | ||
550b3aac | 908 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
909 | { |
910 | u8 value = 0; | |
c2cf5769 LZ |
911 | int result; |
912 | acpi_status status; | |
01305d41 | 913 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
914 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
915 | .wdata = NULL, .rdata = &value, | |
916 | .wlen = 0, .rlen = 1}; | |
3eba563e | 917 | |
550b3aac LZ |
918 | /* |
919 | * Query the EC to find out which _Qxx method we need to evaluate. | |
920 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
921 | * bit to be cleared (and thus clearing the interrupt source). | |
922 | */ | |
923 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
924 | if (result) |
925 | return result; | |
550b3aac LZ |
926 | if (data) |
927 | *data = value; | |
928 | if (!value) | |
929 | return -ENODATA; | |
3eba563e | 930 | |
550b3aac | 931 | mutex_lock(&ec->mutex); |
837012ed AS |
932 | list_for_each_entry(handler, &ec->list, node) { |
933 | if (value == handler->query_bit) { | |
934 | /* have custom handler for this bit */ | |
01305d41 | 935 | handler = acpi_ec_get_query_handler(handler); |
3535a3c1 LZ |
936 | ec_dbg_evt("Query(0x%02x) scheduled", |
937 | handler->query_bit); | |
c2cf5769 | 938 | status = acpi_os_execute((handler->func) ? |
f5347867 | 939 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 940 | acpi_ec_run, handler); |
c2cf5769 LZ |
941 | if (ACPI_FAILURE(status)) |
942 | result = -EBUSY; | |
943 | break; | |
837012ed AS |
944 | } |
945 | } | |
550b3aac | 946 | mutex_unlock(&ec->mutex); |
c2cf5769 | 947 | return result; |
a62e8f19 AS |
948 | } |
949 | ||
74443bbe | 950 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 951 | { |
74443bbe | 952 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 953 | |
550b3aac | 954 | acpi_ec_query(ec, NULL); |
45bea155 | 955 | } |
1da177e4 | 956 | |
8b6cd8ad LM |
957 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
958 | u32 gpe_number, void *data) | |
1da177e4 | 959 | { |
f92fca00 | 960 | unsigned long flags; |
3d02b90b | 961 | struct acpi_ec *ec = data; |
7c6db4e0 | 962 | |
f92fca00 | 963 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 964 | advance_transaction(ec); |
c0d65341 | 965 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 966 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
967 | } |
968 | ||
1da177e4 | 969 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
970 | * Address Space Management |
971 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 972 | |
1da177e4 | 973 | static acpi_status |
5b7734b4 | 974 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 975 | u32 bits, u64 *value64, |
50526df6 | 976 | void *handler_context, void *region_context) |
1da177e4 | 977 | { |
3d02b90b | 978 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
979 | int result = 0, i, bytes = bits / 8; |
980 | u8 *value = (u8 *)value64; | |
1da177e4 | 981 | |
1da177e4 | 982 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 983 | return AE_BAD_PARAMETER; |
1da177e4 | 984 | |
5b7734b4 | 985 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 986 | return AE_BAD_PARAMETER; |
1da177e4 | 987 | |
dadf28a1 | 988 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 989 | acpi_ec_burst_enable(ec); |
b3b233c7 | 990 | |
dadf28a1 AS |
991 | for (i = 0; i < bytes; ++i, ++address, ++value) |
992 | result = (function == ACPI_READ) ? | |
993 | acpi_ec_read(ec, address, value) : | |
994 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 995 | |
dadf28a1 | 996 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 997 | acpi_ec_burst_disable(ec); |
b3b233c7 | 998 | |
1da177e4 LT |
999 | switch (result) { |
1000 | case -EINVAL: | |
d550d98d | 1001 | return AE_BAD_PARAMETER; |
1da177e4 | 1002 | case -ENODEV: |
d550d98d | 1003 | return AE_NOT_FOUND; |
1da177e4 | 1004 | case -ETIME: |
d550d98d | 1005 | return AE_TIME; |
1da177e4 | 1006 | default: |
d550d98d | 1007 | return AE_OK; |
1da177e4 | 1008 | } |
1da177e4 LT |
1009 | } |
1010 | ||
1da177e4 | 1011 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1012 | * Driver Interface |
1013 | * -------------------------------------------------------------------------- */ | |
1014 | ||
c0900c35 AS |
1015 | static acpi_status |
1016 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1017 | ||
c0900c35 AS |
1018 | static struct acpi_ec *make_acpi_ec(void) |
1019 | { | |
1020 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1021 | |
c0900c35 AS |
1022 | if (!ec) |
1023 | return NULL; | |
37d11391 | 1024 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 1025 | mutex_init(&ec->mutex); |
c0900c35 | 1026 | init_waitqueue_head(&ec->wait); |
837012ed | 1027 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1028 | spin_lock_init(&ec->lock); |
74443bbe | 1029 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
d8d031a6 | 1030 | ec->timestamp = jiffies; |
c0900c35 AS |
1031 | return ec; |
1032 | } | |
837012ed | 1033 | |
c019b193 AS |
1034 | static acpi_status |
1035 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1036 | void *context, void **return_value) | |
1037 | { | |
0175d562 LM |
1038 | char node_name[5]; |
1039 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1040 | struct acpi_ec *ec = context; |
1041 | int value = 0; | |
0175d562 LM |
1042 | acpi_status status; |
1043 | ||
1044 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1045 | ||
7a73e60e | 1046 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1047 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1048 | return AE_OK; |
1049 | } | |
1050 | ||
cd8c93a4 AS |
1051 | static acpi_status |
1052 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1053 | { |
cd8c93a4 | 1054 | acpi_status status; |
d21cf3c1 | 1055 | unsigned long long tmp = 0; |
cd8c93a4 | 1056 | struct acpi_ec *ec = context; |
a5032bfd AS |
1057 | |
1058 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1059 | ec->command_addr = ec->data_addr = 0; | |
1060 | ||
cd8c93a4 AS |
1061 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1062 | ec_parse_io_ports, ec); | |
1063 | if (ACPI_FAILURE(status)) | |
1064 | return status; | |
837012ed AS |
1065 | |
1066 | /* Get GPE bit assignment (EC events). */ | |
1067 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1068 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1069 | if (ACPI_FAILURE(status)) |
1070 | return status; | |
27663c58 | 1071 | ec->gpe = tmp; |
837012ed | 1072 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1073 | tmp = 0; |
27663c58 MW |
1074 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1075 | ec->global_lock = tmp; | |
837012ed | 1076 | ec->handle = handle; |
cd8c93a4 | 1077 | return AE_CTRL_TERMINATE; |
837012ed AS |
1078 | } |
1079 | ||
5efc5476 BH |
1080 | static int ec_install_handlers(struct acpi_ec *ec) |
1081 | { | |
1082 | acpi_status status; | |
7a73e60e | 1083 | |
5efc5476 BH |
1084 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1085 | return 0; | |
ca37bfdf | 1086 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1087 | ACPI_GPE_EDGE_TRIGGERED, |
1088 | &acpi_ec_gpe_handler, ec); | |
1089 | if (ACPI_FAILURE(status)) | |
1090 | return -ENODEV; | |
9630bdd9 | 1091 | |
ad479e7f | 1092 | acpi_ec_start(ec, false); |
5efc5476 BH |
1093 | status = acpi_install_address_space_handler(ec->handle, |
1094 | ACPI_ADR_SPACE_EC, | |
1095 | &acpi_ec_space_handler, | |
1096 | NULL, ec); | |
1097 | if (ACPI_FAILURE(status)) { | |
1098 | if (status == AE_NOT_FOUND) { | |
1099 | /* | |
1100 | * Maybe OS fails in evaluating the _REG object. | |
1101 | * The AE_NOT_FOUND error will be ignored and OS | |
1102 | * continue to initialize EC. | |
1103 | */ | |
16a26e85 | 1104 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1105 | " of EC device. Broken bios is suspected.\n"); |
1106 | } else { | |
ad479e7f | 1107 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1108 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1109 | &acpi_ec_gpe_handler); | |
1110 | return -ENODEV; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
4c611060 AS |
1118 | static void ec_remove_handlers(struct acpi_ec *ec) |
1119 | { | |
1741acea LZ |
1120 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1121 | return; | |
ad479e7f | 1122 | acpi_ec_stop(ec, false); |
4c611060 AS |
1123 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1124 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1125 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1126 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1127 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1128 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1129 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1130 | } |
1131 | ||
703959d4 | 1132 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1133 | { |
703959d4 | 1134 | struct acpi_ec *ec = NULL; |
d02be047 | 1135 | int ret; |
45bea155 | 1136 | |
c0900c35 AS |
1137 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1138 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1139 | ||
4c611060 | 1140 | /* Check for boot EC */ |
ce52ddf5 AS |
1141 | if (boot_ec && |
1142 | (boot_ec->handle == device->handle || | |
1143 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1144 | ec = boot_ec; | |
1145 | boot_ec = NULL; | |
1146 | } else { | |
1147 | ec = make_acpi_ec(); | |
1148 | if (!ec) | |
1149 | return -ENOMEM; | |
a5032bfd AS |
1150 | } |
1151 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1152 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1153 | kfree(ec); |
1154 | return -EINVAL; | |
4c611060 AS |
1155 | } |
1156 | ||
ce52ddf5 AS |
1157 | /* Find and register all query methods */ |
1158 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1159 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1160 | |
4c611060 AS |
1161 | if (!first_ec) |
1162 | first_ec = ec; | |
db89b4f0 | 1163 | device->driver_data = ec; |
de4f1046 | 1164 | |
d6795fe3 AK |
1165 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1166 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1167 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1168 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1169 | |
16a26e85 | 1170 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1171 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1172 | |
1173 | ret = ec_install_handlers(ec); | |
1174 | ||
1c832b3e LT |
1175 | /* Reprobe devices depending on the EC */ |
1176 | acpi_walk_dep_device_list(ec->handle); | |
1177 | ||
5efc5476 | 1178 | /* EC is fully operational, allow queries */ |
37d11391 | 1179 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1180 | |
1181 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1182 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1183 | acpi_ec_clear(ec); |
5efc5476 | 1184 | return ret; |
1da177e4 LT |
1185 | } |
1186 | ||
51fac838 | 1187 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1188 | { |
01f22462 | 1189 | struct acpi_ec *ec; |
07ddf768 | 1190 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1191 | |
1da177e4 | 1192 | if (!device) |
d550d98d | 1193 | return -EINVAL; |
1da177e4 LT |
1194 | |
1195 | ec = acpi_driver_data(device); | |
cf745ec7 | 1196 | ec_remove_handlers(ec); |
f351d027 | 1197 | mutex_lock(&ec->mutex); |
07ddf768 | 1198 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1199 | list_del(&handler->node); |
1200 | kfree(handler); | |
1201 | } | |
f351d027 | 1202 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1203 | release_region(ec->data_addr, 1); |
1204 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1205 | device->driver_data = NULL; |
d033879c | 1206 | if (ec == first_ec) |
c0900c35 | 1207 | first_ec = NULL; |
4c611060 | 1208 | kfree(ec); |
d550d98d | 1209 | return 0; |
1da177e4 LT |
1210 | } |
1211 | ||
1da177e4 | 1212 | static acpi_status |
c0900c35 | 1213 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1214 | { |
3d02b90b | 1215 | struct acpi_ec *ec = context; |
1da177e4 | 1216 | |
01f22462 | 1217 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1218 | return AE_OK; |
1da177e4 LT |
1219 | |
1220 | /* | |
1221 | * The first address region returned is the data port, and | |
1222 | * the second address region returned is the status/command | |
1223 | * port. | |
1224 | */ | |
de4f1046 | 1225 | if (ec->data_addr == 0) |
6ffb221a | 1226 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1227 | else if (ec->command_addr == 0) |
6ffb221a | 1228 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1229 | else |
1da177e4 | 1230 | return AE_CTRL_TERMINATE; |
1da177e4 | 1231 | |
1da177e4 LT |
1232 | return AE_OK; |
1233 | } | |
1234 | ||
c04209a7 AS |
1235 | int __init acpi_boot_ec_enable(void) |
1236 | { | |
7c6db4e0 | 1237 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1238 | return 0; |
1239 | if (!ec_install_handlers(boot_ec)) { | |
1240 | first_ec = boot_ec; | |
1241 | return 0; | |
1242 | } | |
1243 | return -EFAULT; | |
1244 | } | |
1245 | ||
223883b7 AS |
1246 | static const struct acpi_device_id ec_device_ids[] = { |
1247 | {"PNP0C09", 0}, | |
1248 | {"", 0}, | |
1249 | }; | |
1250 | ||
478fa03b AS |
1251 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1252 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1253 | { | |
1254 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1255 | return 0; | |
1256 | } | |
1257 | ||
0adf3c74 AS |
1258 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1259 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1260 | { | |
1261 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | /* MSI EC needs special treatment, enable it */ | |
1266 | static int ec_flag_msi(const struct dmi_system_id *id) | |
1267 | { | |
16a26e85 | 1268 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
1269 | EC_FLAGS_MSI = 1; |
1270 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1271 | return 0; | |
1272 | } | |
1273 | ||
79149001 LZ |
1274 | /* |
1275 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1276 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1277 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1278 | */ | |
1279 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1280 | { | |
1281 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1282 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1283 | return 0; | |
1284 | } | |
1285 | ||
ad332c8a KC |
1286 | /* |
1287 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1288 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1289 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1290 | * | |
1291 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1292 | * | |
1293 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1294 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1295 | * behaviour is not known at this time. | |
1296 | * | |
1297 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1298 | * however it is very likely that other Samsung models are affected. | |
1299 | * | |
1300 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1301 | * should be harmless. | |
1302 | */ | |
1303 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1304 | { | |
1305 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1306 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1307 | return 0; | |
1308 | } | |
1309 | ||
6cef7497 | 1310 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1311 | { |
1312 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1313 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1314 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1315 | { |
1316 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1317 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1318 | { | |
1319 | ec_flag_msi, "MSI hardware", { | |
1320 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1321 | { | |
1322 | ec_flag_msi, "MSI hardware", { | |
1323 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1324 | { |
a5dc4f89 AS |
1325 | ec_flag_msi, "MSI hardware", { |
1326 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1327 | { | |
534bc4e3 ZR |
1328 | ec_flag_msi, "Quanta hardware", { |
1329 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1330 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1331 | { | |
1332 | ec_flag_msi, "Quanta hardware", { | |
1333 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1334 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1335 | { | |
777cb382 LT |
1336 | ec_flag_msi, "Clevo W350etq", { |
1337 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1338 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
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 */ |