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 */ |
2a84cb98 | 73 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
9e295ac1 | 74 | #define ACPI_EC_UDELAY_POLL 1000 /* Wait 1ms for EC transaction polling */ |
ad332c8a KC |
75 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
76 | * when trying to clear the EC */ | |
703959d4 | 77 | |
080e412c | 78 | enum { |
37d11391 | 79 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
f6bb13aa | 80 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 81 | * OpReg are installed */ |
ad479e7f LZ |
82 | EC_FLAGS_STARTED, /* Driver is started */ |
83 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
84 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
85 | * current command processing */ | |
1da177e4 | 86 | }; |
6ffb221a | 87 | |
f92fca00 LZ |
88 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
89 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
90 | ||
7a18e96d TR |
91 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
92 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
93 | module_param(ec_delay, uint, 0644); | |
94 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
95 | ||
a520d52e FT |
96 | /* |
97 | * If the number of false interrupts per one transaction exceeds | |
98 | * this threshold, will think there is a GPE storm happened and | |
99 | * will disable the GPE for normal transaction. | |
100 | */ | |
101 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
102 | module_param(ec_storm_threshold, uint, 0644); | |
103 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
104 | ||
837012ed AS |
105 | struct acpi_ec_query_handler { |
106 | struct list_head node; | |
107 | acpi_ec_query_func func; | |
108 | acpi_handle handle; | |
109 | void *data; | |
110 | u8 query_bit; | |
01305d41 | 111 | struct kref kref; |
837012ed AS |
112 | }; |
113 | ||
8463200a | 114 | struct transaction { |
7c6db4e0 AS |
115 | const u8 *wdata; |
116 | u8 *rdata; | |
117 | unsigned short irq_count; | |
8463200a | 118 | u8 command; |
a2f93aea AS |
119 | u8 wi; |
120 | u8 ri; | |
7c6db4e0 AS |
121 | u8 wlen; |
122 | u8 rlen; | |
f92fca00 | 123 | u8 flags; |
9e295ac1 | 124 | unsigned long timestamp; |
7c6db4e0 AS |
125 | }; |
126 | ||
550b3aac | 127 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 128 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 129 | |
1195a098 TR |
130 | struct acpi_ec *boot_ec, *first_ec; |
131 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 132 | |
5423a0cb | 133 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 134 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 135 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 136 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 137 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 138 | |
3535a3c1 LZ |
139 | /* -------------------------------------------------------------------------- |
140 | * Logging/Debugging | |
141 | * -------------------------------------------------------------------------- */ | |
142 | ||
143 | /* | |
144 | * Splitters used by the developers to track the boundary of the EC | |
145 | * handling processes. | |
146 | */ | |
147 | #ifdef DEBUG | |
148 | #define EC_DBG_SEP " " | |
149 | #define EC_DBG_DRV "+++++" | |
150 | #define EC_DBG_STM "=====" | |
151 | #define EC_DBG_REQ "*****" | |
152 | #define EC_DBG_EVT "#####" | |
153 | #else | |
154 | #define EC_DBG_SEP "" | |
155 | #define EC_DBG_DRV | |
156 | #define EC_DBG_STM | |
157 | #define EC_DBG_REQ | |
158 | #define EC_DBG_EVT | |
159 | #endif | |
160 | ||
161 | #define ec_log_raw(fmt, ...) \ | |
162 | pr_info(fmt "\n", ##__VA_ARGS__) | |
163 | #define ec_dbg_raw(fmt, ...) \ | |
164 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
165 | #define ec_log(filter, fmt, ...) \ | |
166 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
167 | #define ec_dbg(filter, fmt, ...) \ | |
168 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
169 | ||
170 | #define ec_log_drv(fmt, ...) \ | |
171 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
172 | #define ec_dbg_drv(fmt, ...) \ | |
173 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
174 | #define ec_dbg_stm(fmt, ...) \ | |
175 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
176 | #define ec_dbg_req(fmt, ...) \ | |
177 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
178 | #define ec_dbg_evt(fmt, ...) \ | |
179 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
180 | #define ec_dbg_ref(ec, fmt, ...) \ |
181 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 182 | |
ad479e7f LZ |
183 | /* -------------------------------------------------------------------------- |
184 | * Device Flags | |
185 | * -------------------------------------------------------------------------- */ | |
186 | ||
187 | static bool acpi_ec_started(struct acpi_ec *ec) | |
188 | { | |
189 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
190 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
191 | } | |
192 | ||
9887d22a LZ |
193 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
194 | { | |
195 | return ec->reference_count == 1; | |
196 | } | |
197 | ||
1da177e4 | 198 | /* -------------------------------------------------------------------------- |
ca37bfdf | 199 | * EC Registers |
7a73e60e | 200 | * -------------------------------------------------------------------------- */ |
1da177e4 | 201 | |
6ffb221a | 202 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 203 | { |
3ebe08a7 | 204 | u8 x = inb(ec->command_addr); |
7a73e60e | 205 | |
3535a3c1 LZ |
206 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
207 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
208 | x, | |
209 | !!(x & ACPI_EC_FLAG_SCI), | |
210 | !!(x & ACPI_EC_FLAG_BURST), | |
211 | !!(x & ACPI_EC_FLAG_CMD), | |
212 | !!(x & ACPI_EC_FLAG_IBF), | |
213 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 214 | return x; |
451566f4 DT |
215 | } |
216 | ||
6ffb221a | 217 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 218 | { |
3ebe08a7 | 219 | u8 x = inb(ec->data_addr); |
7a73e60e | 220 | |
9e295ac1 | 221 | ec->curr->timestamp = jiffies; |
3535a3c1 | 222 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 223 | return x; |
7c6db5e5 DS |
224 | } |
225 | ||
6ffb221a | 226 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 227 | { |
3535a3c1 | 228 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 229 | outb(command, ec->command_addr); |
9e295ac1 | 230 | ec->curr->timestamp = jiffies; |
45bea155 LY |
231 | } |
232 | ||
6ffb221a | 233 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 234 | { |
3535a3c1 | 235 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 236 | outb(data, ec->data_addr); |
9e295ac1 | 237 | ec->curr->timestamp = jiffies; |
703959d4 | 238 | } |
45bea155 | 239 | |
e34c0e2b LZ |
240 | #ifdef DEBUG |
241 | static const char *acpi_ec_cmd_string(u8 cmd) | |
242 | { | |
243 | switch (cmd) { | |
244 | case 0x80: | |
245 | return "RD_EC"; | |
246 | case 0x81: | |
247 | return "WR_EC"; | |
248 | case 0x82: | |
249 | return "BE_EC"; | |
250 | case 0x83: | |
251 | return "BD_EC"; | |
252 | case 0x84: | |
253 | return "QR_EC"; | |
254 | } | |
255 | return "UNKNOWN"; | |
256 | } | |
257 | #else | |
258 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
259 | #endif | |
260 | ||
ca37bfdf LZ |
261 | /* -------------------------------------------------------------------------- |
262 | * GPE Registers | |
263 | * -------------------------------------------------------------------------- */ | |
264 | ||
265 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
266 | { | |
267 | acpi_event_status gpe_status = 0; | |
268 | ||
269 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
270 | return (gpe_status & ACPI_EVENT_FLAG_SET) ? true : false; | |
271 | } | |
272 | ||
273 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
274 | { | |
275 | if (open) | |
276 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
277 | else { |
278 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 279 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 280 | } |
ca37bfdf LZ |
281 | if (acpi_ec_is_gpe_raised(ec)) { |
282 | /* | |
283 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
284 | * software need to manually trigger a pseudo GPE event on | |
285 | * EN=1 writes. | |
286 | */ | |
3535a3c1 | 287 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
288 | advance_transaction(ec); |
289 | } | |
290 | } | |
291 | ||
292 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
293 | { | |
294 | if (close) | |
295 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
296 | else { |
297 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 298 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 299 | } |
ca37bfdf LZ |
300 | } |
301 | ||
302 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
303 | { | |
304 | /* | |
305 | * GPE STS is a W1C register, which means: | |
306 | * 1. Software can clear it without worrying about clearing other | |
307 | * GPEs' STS bits when the hardware sets them in parallel. | |
308 | * 2. As long as software can ensure only clearing it when it is | |
309 | * set, hardware won't set it in parallel. | |
310 | * So software can clear GPE in any contexts. | |
311 | * Warning: do not move the check into advance_transaction() as the | |
312 | * EC commands will be sent without GPE raised. | |
313 | */ | |
314 | if (!acpi_ec_is_gpe_raised(ec)) | |
315 | return; | |
316 | acpi_clear_gpe(NULL, ec->gpe); | |
317 | } | |
318 | ||
319 | /* -------------------------------------------------------------------------- | |
320 | * Transaction Management | |
321 | * -------------------------------------------------------------------------- */ | |
322 | ||
9887d22a LZ |
323 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
324 | { | |
325 | ec->reference_count++; | |
326 | if (ec->reference_count == 1) | |
327 | acpi_ec_enable_gpe(ec, true); | |
328 | } | |
329 | ||
330 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
331 | { | |
332 | bool flushed = false; | |
333 | ||
334 | ec->reference_count--; | |
335 | if (ec->reference_count == 0) | |
336 | acpi_ec_disable_gpe(ec, true); | |
337 | flushed = acpi_ec_flushed(ec); | |
338 | if (flushed) | |
339 | wake_up(&ec->wait); | |
340 | } | |
341 | ||
e1d4d90f LZ |
342 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
343 | { | |
344 | if (!test_bit(flag, &ec->flags)) { | |
345 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 346 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
347 | set_bit(flag, &ec->flags); |
348 | } | |
349 | } | |
350 | ||
351 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
352 | { | |
353 | if (test_bit(flag, &ec->flags)) { | |
354 | clear_bit(flag, &ec->flags); | |
355 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 356 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
357 | } |
358 | } | |
359 | ||
9887d22a LZ |
360 | /* |
361 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
362 | * the flush operation is not in | |
363 | * progress | |
364 | * @ec: the EC device | |
365 | * | |
366 | * This function must be used before taking a new action that should hold | |
367 | * the reference count. If this function returns false, then the action | |
368 | * must be discarded or it will prevent the flush operation from being | |
369 | * completed. | |
370 | */ | |
37d11391 | 371 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 372 | { |
37d11391 RW |
373 | if (!acpi_ec_started(ec)) |
374 | return false; | |
9887d22a LZ |
375 | acpi_ec_submit_request(ec); |
376 | return true; | |
377 | } | |
378 | ||
37d11391 | 379 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 380 | { |
37d11391 | 381 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
3535a3c1 | 382 | ec_dbg_req("Event started"); |
74443bbe LZ |
383 | schedule_work(&ec->work); |
384 | } | |
385 | } | |
386 | ||
37d11391 | 387 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe LZ |
388 | { |
389 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
37d11391 | 390 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
3535a3c1 | 391 | ec_dbg_req("Event stopped"); |
74443bbe LZ |
392 | } |
393 | } | |
394 | ||
f92fca00 | 395 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 396 | { |
7c6db4e0 AS |
397 | unsigned long flags; |
398 | int ret = 0; | |
7a73e60e | 399 | |
f351d027 | 400 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 401 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 402 | ret = 1; |
f351d027 | 403 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 404 | return ret; |
45bea155 | 405 | } |
451566f4 | 406 | |
0c78808f | 407 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 408 | { |
36b15875 | 409 | struct transaction *t; |
66b42b78 | 410 | u8 status; |
c0d65341 | 411 | bool wakeup = false; |
b76b51ba | 412 | |
3535a3c1 LZ |
413 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
414 | smp_processor_id()); | |
ca37bfdf LZ |
415 | /* |
416 | * By always clearing STS before handling all indications, we can | |
417 | * ensure a hardware STS 0->1 change after this clearing can always | |
418 | * trigger a GPE interrupt. | |
419 | */ | |
420 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 421 | status = acpi_ec_read_status(ec); |
36b15875 | 422 | t = ec->curr; |
b76b51ba | 423 | if (!t) |
f92fca00 LZ |
424 | goto err; |
425 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
426 | if (t->wlen > t->wi) { | |
427 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
428 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
429 | else | |
430 | goto err; | |
431 | } else if (t->rlen > t->ri) { | |
432 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
433 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 434 | if (t->rlen == t->ri) { |
f92fca00 | 435 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 436 | if (t->command == ACPI_EC_COMMAND_QUERY) |
3535a3c1 LZ |
437 | ec_dbg_req("Command(%s) hardware completion", |
438 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
439 | wakeup = true; |
440 | } | |
f92fca00 LZ |
441 | } else |
442 | goto err; | |
443 | } else if (t->wlen == t->wi && | |
c0d65341 | 444 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 445 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
446 | wakeup = true; |
447 | } | |
0c78808f | 448 | goto out; |
f92fca00 | 449 | } else { |
79149001 LZ |
450 | if (EC_FLAGS_QUERY_HANDSHAKE && |
451 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
452 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
453 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 454 | acpi_ec_complete_query(ec); |
3afcf2ec LZ |
455 | t->rdata[t->ri++] = 0x00; |
456 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
3535a3c1 LZ |
457 | ec_dbg_req("Command(%s) software completion", |
458 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
459 | wakeup = true; |
460 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
461 | acpi_ec_write_cmd(ec, t->command); |
462 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 463 | acpi_ec_complete_query(ec); |
7c6db4e0 | 464 | } else |
dd15f8c4 | 465 | goto err; |
0c78808f | 466 | goto out; |
f92fca00 | 467 | } |
dd15f8c4 | 468 | err: |
a3cd8d27 FT |
469 | /* |
470 | * If SCI bit is set, then don't think it's a false IRQ | |
471 | * otherwise will take a not handled IRQ as a false one. | |
472 | */ | |
f92fca00 | 473 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
474 | if (in_interrupt() && t) { |
475 | if (t->irq_count < ec_storm_threshold) | |
476 | ++t->irq_count; | |
477 | /* Allow triggering on 0 threshold */ | |
478 | if (t->irq_count == ec_storm_threshold) | |
479 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
480 | } | |
f92fca00 | 481 | } |
0c78808f | 482 | out: |
74443bbe | 483 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 484 | acpi_ec_submit_query(ec); |
0c78808f LZ |
485 | if (wakeup && in_interrupt()) |
486 | wake_up(&ec->wait); | |
f92fca00 | 487 | } |
a3cd8d27 | 488 | |
f92fca00 LZ |
489 | static void start_transaction(struct acpi_ec *ec) |
490 | { | |
491 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
492 | ec->curr->flags = 0; | |
9e295ac1 | 493 | ec->curr->timestamp = jiffies; |
0c78808f | 494 | advance_transaction(ec); |
845625cd | 495 | } |
03d1d99c | 496 | |
7c6db4e0 AS |
497 | static int ec_poll(struct acpi_ec *ec) |
498 | { | |
2a84cb98 | 499 | unsigned long flags; |
28fe5c82 | 500 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 501 | |
2a84cb98 AS |
502 | while (repeat--) { |
503 | unsigned long delay = jiffies + | |
7a18e96d | 504 | msecs_to_jiffies(ec_delay); |
9e295ac1 | 505 | unsigned long usecs = ACPI_EC_UDELAY_POLL; |
2a84cb98 AS |
506 | do { |
507 | /* don't sleep with disabled interrupts */ | |
508 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
9e295ac1 LZ |
509 | usecs = ACPI_EC_MSI_UDELAY; |
510 | udelay(usecs); | |
f92fca00 | 511 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
512 | return 0; |
513 | } else { | |
514 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 515 | ec_transaction_completed(ec), |
9e295ac1 | 516 | usecs_to_jiffies(usecs))) |
2a84cb98 AS |
517 | return 0; |
518 | } | |
f92fca00 | 519 | spin_lock_irqsave(&ec->lock, flags); |
9e295ac1 LZ |
520 | if (time_after(jiffies, |
521 | ec->curr->timestamp + | |
522 | usecs_to_jiffies(usecs))) | |
523 | advance_transaction(ec); | |
f92fca00 | 524 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 525 | } while (time_before(jiffies, delay)); |
16a26e85 | 526 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 527 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 528 | start_transaction(ec); |
f351d027 | 529 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 530 | } |
b77d81b2 | 531 | return -ETIME; |
1da177e4 LT |
532 | } |
533 | ||
8463200a | 534 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 535 | struct transaction *t) |
45bea155 | 536 | { |
7c6db4e0 | 537 | unsigned long tmp; |
7c6db4e0 | 538 | int ret = 0; |
7a73e60e | 539 | |
5423a0cb | 540 | if (EC_FLAGS_MSI) |
2a84cb98 | 541 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 542 | /* start transaction */ |
f351d027 | 543 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 544 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 545 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
546 | ret = -EINVAL; |
547 | goto unlock; | |
548 | } | |
770970f0 | 549 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 550 | /* following two actions should be kept atomic */ |
8463200a | 551 | ec->curr = t; |
3535a3c1 | 552 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 553 | start_transaction(ec); |
df9ff918 LZ |
554 | spin_unlock_irqrestore(&ec->lock, tmp); |
555 | ret = ec_poll(ec); | |
556 | spin_lock_irqsave(&ec->lock, tmp); | |
e1d4d90f LZ |
557 | if (t->irq_count == ec_storm_threshold) |
558 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 559 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 560 | ec->curr = NULL; |
9887d22a LZ |
561 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
562 | acpi_ec_complete_request(ec); | |
770970f0 | 563 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 564 | unlock: |
f351d027 | 565 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
566 | return ret; |
567 | } | |
568 | ||
2a84cb98 | 569 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 570 | { |
d7a76e4c | 571 | int status; |
50526df6 | 572 | u32 glk; |
7a73e60e | 573 | |
8463200a | 574 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 575 | return -EINVAL; |
8463200a AS |
576 | if (t->rdata) |
577 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 578 | mutex_lock(&ec->mutex); |
703959d4 | 579 | if (ec->global_lock) { |
1da177e4 | 580 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 581 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
582 | status = -ENODEV; |
583 | goto unlock; | |
c24e912b | 584 | } |
1da177e4 | 585 | } |
a62e8f19 | 586 | |
2a84cb98 | 587 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 588 | |
e1d4d90f | 589 | if (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags)) |
54070101 | 590 | msleep(1); |
703959d4 | 591 | if (ec->global_lock) |
1da177e4 | 592 | acpi_release_global_lock(glk); |
7c6db4e0 | 593 | unlock: |
f351d027 | 594 | mutex_unlock(&ec->mutex); |
d550d98d | 595 | return status; |
1da177e4 LT |
596 | } |
597 | ||
8a383ef0 | 598 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
599 | { |
600 | u8 d; | |
8463200a AS |
601 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
602 | .wdata = NULL, .rdata = &d, | |
603 | .wlen = 0, .rlen = 1}; | |
604 | ||
2a84cb98 | 605 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
606 | } |
607 | ||
8a383ef0 | 608 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 609 | { |
8463200a AS |
610 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
611 | .wdata = NULL, .rdata = NULL, | |
612 | .wlen = 0, .rlen = 0}; | |
613 | ||
7c6db4e0 | 614 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 615 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
616 | } |
617 | ||
7a73e60e | 618 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
619 | { |
620 | int result; | |
621 | u8 d; | |
8463200a AS |
622 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
623 | .wdata = &address, .rdata = &d, | |
624 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 625 | |
2a84cb98 | 626 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
627 | *data = d; |
628 | return result; | |
629 | } | |
6ffb221a | 630 | |
3576cf61 DS |
631 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
632 | { | |
6ccedb10 | 633 | u8 wdata[2] = { address, data }; |
8463200a AS |
634 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
635 | .wdata = wdata, .rdata = NULL, | |
636 | .wlen = 2, .rlen = 0}; | |
637 | ||
2a84cb98 | 638 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
639 | } |
640 | ||
b76b51ba | 641 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 642 | { |
1da177e4 | 643 | int err; |
6ffb221a | 644 | u8 temp_data; |
1da177e4 LT |
645 | |
646 | if (!first_ec) | |
647 | return -ENODEV; | |
648 | ||
d033879c | 649 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
650 | |
651 | if (!err) { | |
652 | *val = temp_data; | |
653 | return 0; | |
7a73e60e LZ |
654 | } |
655 | return err; | |
1da177e4 LT |
656 | } |
657 | EXPORT_SYMBOL(ec_read); | |
658 | ||
50526df6 | 659 | int ec_write(u8 addr, u8 val) |
1da177e4 | 660 | { |
1da177e4 LT |
661 | int err; |
662 | ||
663 | if (!first_ec) | |
664 | return -ENODEV; | |
665 | ||
d033879c | 666 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
667 | |
668 | return err; | |
669 | } | |
670 | EXPORT_SYMBOL(ec_write); | |
671 | ||
616362de | 672 | int ec_transaction(u8 command, |
7a73e60e LZ |
673 | const u8 *wdata, unsigned wdata_len, |
674 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 675 | { |
8463200a AS |
676 | struct transaction t = {.command = command, |
677 | .wdata = wdata, .rdata = rdata, | |
678 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 679 | |
d7a76e4c LP |
680 | if (!first_ec) |
681 | return -ENODEV; | |
45bea155 | 682 | |
2a84cb98 | 683 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 684 | } |
ab9e43c6 LP |
685 | EXPORT_SYMBOL(ec_transaction); |
686 | ||
3e2abc5a SF |
687 | /* Get the handle to the EC device */ |
688 | acpi_handle ec_get_handle(void) | |
689 | { | |
690 | if (!first_ec) | |
691 | return NULL; | |
692 | return first_ec->handle; | |
693 | } | |
3e2abc5a SF |
694 | EXPORT_SYMBOL(ec_get_handle); |
695 | ||
ad332c8a | 696 | /* |
3eba563e | 697 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
698 | * Run with locked ec mutex. |
699 | */ | |
700 | static void acpi_ec_clear(struct acpi_ec *ec) | |
701 | { | |
702 | int i, status; | |
703 | u8 value = 0; | |
704 | ||
705 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 706 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
707 | if (status || !value) |
708 | break; | |
709 | } | |
710 | ||
711 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
712 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
713 | else | |
714 | pr_info("%d stale EC events cleared\n", i); | |
715 | } | |
716 | ||
ad479e7f LZ |
717 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
718 | { | |
719 | unsigned long flags; | |
720 | ||
721 | spin_lock_irqsave(&ec->lock, flags); | |
722 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 723 | ec_dbg_drv("Starting EC"); |
9887d22a | 724 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 725 | if (!resuming) { |
9887d22a | 726 | acpi_ec_submit_request(ec); |
770970f0 LZ |
727 | ec_dbg_ref(ec, "Increase driver"); |
728 | } | |
3535a3c1 | 729 | ec_log_drv("EC started"); |
ad479e7f LZ |
730 | } |
731 | spin_unlock_irqrestore(&ec->lock, flags); | |
732 | } | |
733 | ||
9887d22a LZ |
734 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
735 | { | |
736 | unsigned long flags; | |
737 | bool flushed; | |
738 | ||
739 | spin_lock_irqsave(&ec->lock, flags); | |
740 | flushed = acpi_ec_flushed(ec); | |
741 | spin_unlock_irqrestore(&ec->lock, flags); | |
742 | return flushed; | |
743 | } | |
744 | ||
ad479e7f LZ |
745 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
746 | { | |
747 | unsigned long flags; | |
748 | ||
749 | spin_lock_irqsave(&ec->lock, flags); | |
750 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 751 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 752 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
753 | spin_unlock_irqrestore(&ec->lock, flags); |
754 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
755 | spin_lock_irqsave(&ec->lock, flags); | |
756 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 757 | if (!suspending) { |
9887d22a | 758 | acpi_ec_complete_request(ec); |
770970f0 LZ |
759 | ec_dbg_ref(ec, "Decrease driver"); |
760 | } | |
ad479e7f LZ |
761 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
762 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 763 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
764 | } |
765 | spin_unlock_irqrestore(&ec->lock, flags); | |
766 | } | |
767 | ||
fe955682 | 768 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
769 | { |
770 | struct acpi_ec *ec = first_ec; | |
771 | ||
772 | if (!ec) | |
773 | return; | |
774 | ||
f351d027 | 775 | mutex_lock(&ec->mutex); |
f6bb13aa | 776 | /* Prevent transactions from being carried out */ |
ad479e7f | 777 | acpi_ec_stop(ec, true); |
f351d027 | 778 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
779 | } |
780 | ||
fe955682 | 781 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
782 | { |
783 | struct acpi_ec *ec = first_ec; | |
784 | ||
785 | if (!ec) | |
786 | return; | |
787 | ||
f6bb13aa | 788 | /* Allow transactions to be carried out again */ |
ad479e7f | 789 | acpi_ec_start(ec, true); |
ad332c8a KC |
790 | |
791 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
792 | acpi_ec_clear(ec); | |
f6bb13aa RW |
793 | } |
794 | ||
fe955682 | 795 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
796 | { |
797 | /* | |
798 | * Allow transactions to happen again (this function is called from | |
799 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
800 | */ | |
801 | if (first_ec) | |
ad479e7f | 802 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
803 | } |
804 | ||
1da177e4 LT |
805 | /* -------------------------------------------------------------------------- |
806 | Event Management | |
807 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
808 | static struct acpi_ec_query_handler * |
809 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
810 | { | |
811 | if (handler) | |
812 | kref_get(&handler->kref); | |
813 | return handler; | |
814 | } | |
815 | ||
816 | static void acpi_ec_query_handler_release(struct kref *kref) | |
817 | { | |
818 | struct acpi_ec_query_handler *handler = | |
819 | container_of(kref, struct acpi_ec_query_handler, kref); | |
820 | ||
821 | kfree(handler); | |
822 | } | |
823 | ||
824 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
825 | { | |
826 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
827 | } | |
828 | ||
837012ed AS |
829 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
830 | acpi_handle handle, acpi_ec_query_func func, | |
831 | void *data) | |
832 | { | |
833 | struct acpi_ec_query_handler *handler = | |
834 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 835 | |
837012ed AS |
836 | if (!handler) |
837 | return -ENOMEM; | |
838 | ||
839 | handler->query_bit = query_bit; | |
840 | handler->handle = handle; | |
841 | handler->func = func; | |
842 | handler->data = data; | |
f351d027 | 843 | mutex_lock(&ec->mutex); |
01305d41 | 844 | kref_init(&handler->kref); |
30c08574 | 845 | list_add(&handler->node, &ec->list); |
f351d027 | 846 | mutex_unlock(&ec->mutex); |
837012ed AS |
847 | return 0; |
848 | } | |
837012ed AS |
849 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
850 | ||
851 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
852 | { | |
1544fdbc | 853 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 854 | LIST_HEAD(free_list); |
7a73e60e | 855 | |
f351d027 | 856 | mutex_lock(&ec->mutex); |
1544fdbc | 857 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 858 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
859 | list_del_init(&handler->node); |
860 | list_add(&handler->node, &free_list); | |
837012ed AS |
861 | } |
862 | } | |
f351d027 | 863 | mutex_unlock(&ec->mutex); |
6b5eab54 | 864 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 865 | acpi_ec_put_query_handler(handler); |
837012ed | 866 | } |
837012ed | 867 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 868 | |
a62e8f19 | 869 | static void acpi_ec_run(void *cxt) |
45bea155 | 870 | { |
a62e8f19 | 871 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 872 | |
a62e8f19 | 873 | if (!handler) |
e41334c0 | 874 | return; |
3535a3c1 | 875 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
876 | if (handler->func) |
877 | handler->func(handler->data); | |
878 | else if (handler->handle) | |
879 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 880 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
01305d41 | 881 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
882 | } |
883 | ||
550b3aac | 884 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
885 | { |
886 | u8 value = 0; | |
c2cf5769 LZ |
887 | int result; |
888 | acpi_status status; | |
01305d41 | 889 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
890 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
891 | .wdata = NULL, .rdata = &value, | |
892 | .wlen = 0, .rlen = 1}; | |
3eba563e | 893 | |
550b3aac LZ |
894 | /* |
895 | * Query the EC to find out which _Qxx method we need to evaluate. | |
896 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
897 | * bit to be cleared (and thus clearing the interrupt source). | |
898 | */ | |
899 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
900 | if (result) |
901 | return result; | |
550b3aac LZ |
902 | if (data) |
903 | *data = value; | |
904 | if (!value) | |
905 | return -ENODATA; | |
3eba563e | 906 | |
550b3aac | 907 | mutex_lock(&ec->mutex); |
837012ed AS |
908 | list_for_each_entry(handler, &ec->list, node) { |
909 | if (value == handler->query_bit) { | |
910 | /* have custom handler for this bit */ | |
01305d41 | 911 | handler = acpi_ec_get_query_handler(handler); |
3535a3c1 LZ |
912 | ec_dbg_evt("Query(0x%02x) scheduled", |
913 | handler->query_bit); | |
c2cf5769 | 914 | status = acpi_os_execute((handler->func) ? |
f5347867 | 915 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 916 | acpi_ec_run, handler); |
c2cf5769 LZ |
917 | if (ACPI_FAILURE(status)) |
918 | result = -EBUSY; | |
919 | break; | |
837012ed AS |
920 | } |
921 | } | |
550b3aac | 922 | mutex_unlock(&ec->mutex); |
c2cf5769 | 923 | return result; |
a62e8f19 AS |
924 | } |
925 | ||
74443bbe | 926 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 927 | { |
74443bbe | 928 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 929 | |
550b3aac | 930 | acpi_ec_query(ec, NULL); |
45bea155 | 931 | } |
1da177e4 | 932 | |
8b6cd8ad LM |
933 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
934 | u32 gpe_number, void *data) | |
1da177e4 | 935 | { |
f92fca00 | 936 | unsigned long flags; |
3d02b90b | 937 | struct acpi_ec *ec = data; |
7c6db4e0 | 938 | |
f92fca00 | 939 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 940 | advance_transaction(ec); |
c0d65341 | 941 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 942 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
943 | } |
944 | ||
1da177e4 | 945 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
946 | * Address Space Management |
947 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 948 | |
1da177e4 | 949 | static acpi_status |
5b7734b4 | 950 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 951 | u32 bits, u64 *value64, |
50526df6 | 952 | void *handler_context, void *region_context) |
1da177e4 | 953 | { |
3d02b90b | 954 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
955 | int result = 0, i, bytes = bits / 8; |
956 | u8 *value = (u8 *)value64; | |
1da177e4 | 957 | |
1da177e4 | 958 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 959 | return AE_BAD_PARAMETER; |
1da177e4 | 960 | |
5b7734b4 | 961 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 962 | return AE_BAD_PARAMETER; |
1da177e4 | 963 | |
dadf28a1 | 964 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 965 | acpi_ec_burst_enable(ec); |
b3b233c7 | 966 | |
dadf28a1 AS |
967 | for (i = 0; i < bytes; ++i, ++address, ++value) |
968 | result = (function == ACPI_READ) ? | |
969 | acpi_ec_read(ec, address, value) : | |
970 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 971 | |
dadf28a1 | 972 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 973 | acpi_ec_burst_disable(ec); |
b3b233c7 | 974 | |
1da177e4 LT |
975 | switch (result) { |
976 | case -EINVAL: | |
d550d98d | 977 | return AE_BAD_PARAMETER; |
1da177e4 | 978 | case -ENODEV: |
d550d98d | 979 | return AE_NOT_FOUND; |
1da177e4 | 980 | case -ETIME: |
d550d98d | 981 | return AE_TIME; |
1da177e4 | 982 | default: |
d550d98d | 983 | return AE_OK; |
1da177e4 | 984 | } |
1da177e4 LT |
985 | } |
986 | ||
1da177e4 | 987 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
988 | * Driver Interface |
989 | * -------------------------------------------------------------------------- */ | |
990 | ||
c0900c35 AS |
991 | static acpi_status |
992 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
993 | ||
c0900c35 AS |
994 | static struct acpi_ec *make_acpi_ec(void) |
995 | { | |
996 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 997 | |
c0900c35 AS |
998 | if (!ec) |
999 | return NULL; | |
37d11391 | 1000 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 1001 | mutex_init(&ec->mutex); |
c0900c35 | 1002 | init_waitqueue_head(&ec->wait); |
837012ed | 1003 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1004 | spin_lock_init(&ec->lock); |
74443bbe | 1005 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
c0900c35 AS |
1006 | return ec; |
1007 | } | |
837012ed | 1008 | |
c019b193 AS |
1009 | static acpi_status |
1010 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1011 | void *context, void **return_value) | |
1012 | { | |
0175d562 LM |
1013 | char node_name[5]; |
1014 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1015 | struct acpi_ec *ec = context; |
1016 | int value = 0; | |
0175d562 LM |
1017 | acpi_status status; |
1018 | ||
1019 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1020 | ||
7a73e60e | 1021 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1022 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1023 | return AE_OK; |
1024 | } | |
1025 | ||
cd8c93a4 AS |
1026 | static acpi_status |
1027 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1028 | { |
cd8c93a4 | 1029 | acpi_status status; |
d21cf3c1 | 1030 | unsigned long long tmp = 0; |
cd8c93a4 | 1031 | struct acpi_ec *ec = context; |
a5032bfd AS |
1032 | |
1033 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1034 | ec->command_addr = ec->data_addr = 0; | |
1035 | ||
cd8c93a4 AS |
1036 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1037 | ec_parse_io_ports, ec); | |
1038 | if (ACPI_FAILURE(status)) | |
1039 | return status; | |
837012ed AS |
1040 | |
1041 | /* Get GPE bit assignment (EC events). */ | |
1042 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1043 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1044 | if (ACPI_FAILURE(status)) |
1045 | return status; | |
27663c58 | 1046 | ec->gpe = tmp; |
837012ed | 1047 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1048 | tmp = 0; |
27663c58 MW |
1049 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1050 | ec->global_lock = tmp; | |
837012ed | 1051 | ec->handle = handle; |
cd8c93a4 | 1052 | return AE_CTRL_TERMINATE; |
837012ed AS |
1053 | } |
1054 | ||
5efc5476 BH |
1055 | static int ec_install_handlers(struct acpi_ec *ec) |
1056 | { | |
1057 | acpi_status status; | |
7a73e60e | 1058 | |
5efc5476 BH |
1059 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1060 | return 0; | |
ca37bfdf | 1061 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1062 | ACPI_GPE_EDGE_TRIGGERED, |
1063 | &acpi_ec_gpe_handler, ec); | |
1064 | if (ACPI_FAILURE(status)) | |
1065 | return -ENODEV; | |
9630bdd9 | 1066 | |
ad479e7f | 1067 | acpi_ec_start(ec, false); |
5efc5476 BH |
1068 | status = acpi_install_address_space_handler(ec->handle, |
1069 | ACPI_ADR_SPACE_EC, | |
1070 | &acpi_ec_space_handler, | |
1071 | NULL, ec); | |
1072 | if (ACPI_FAILURE(status)) { | |
1073 | if (status == AE_NOT_FOUND) { | |
1074 | /* | |
1075 | * Maybe OS fails in evaluating the _REG object. | |
1076 | * The AE_NOT_FOUND error will be ignored and OS | |
1077 | * continue to initialize EC. | |
1078 | */ | |
16a26e85 | 1079 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1080 | " of EC device. Broken bios is suspected.\n"); |
1081 | } else { | |
ad479e7f | 1082 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1083 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1084 | &acpi_ec_gpe_handler); | |
1085 | return -ENODEV; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1090 | return 0; | |
1091 | } | |
1092 | ||
4c611060 AS |
1093 | static void ec_remove_handlers(struct acpi_ec *ec) |
1094 | { | |
1741acea LZ |
1095 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1096 | return; | |
ad479e7f | 1097 | acpi_ec_stop(ec, false); |
4c611060 AS |
1098 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1099 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1100 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1101 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1102 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1103 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1104 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1105 | } |
1106 | ||
703959d4 | 1107 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1108 | { |
703959d4 | 1109 | struct acpi_ec *ec = NULL; |
d02be047 | 1110 | int ret; |
45bea155 | 1111 | |
c0900c35 AS |
1112 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1113 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1114 | ||
4c611060 | 1115 | /* Check for boot EC */ |
ce52ddf5 AS |
1116 | if (boot_ec && |
1117 | (boot_ec->handle == device->handle || | |
1118 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1119 | ec = boot_ec; | |
1120 | boot_ec = NULL; | |
1121 | } else { | |
1122 | ec = make_acpi_ec(); | |
1123 | if (!ec) | |
1124 | return -ENOMEM; | |
a5032bfd AS |
1125 | } |
1126 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1127 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1128 | kfree(ec); |
1129 | return -EINVAL; | |
4c611060 AS |
1130 | } |
1131 | ||
ce52ddf5 AS |
1132 | /* Find and register all query methods */ |
1133 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1134 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1135 | |
4c611060 AS |
1136 | if (!first_ec) |
1137 | first_ec = ec; | |
db89b4f0 | 1138 | device->driver_data = ec; |
de4f1046 | 1139 | |
d6795fe3 AK |
1140 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1141 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1142 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1143 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1144 | |
16a26e85 | 1145 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1146 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1147 | |
1148 | ret = ec_install_handlers(ec); | |
1149 | ||
1c832b3e LT |
1150 | /* Reprobe devices depending on the EC */ |
1151 | acpi_walk_dep_device_list(ec->handle); | |
1152 | ||
5efc5476 | 1153 | /* EC is fully operational, allow queries */ |
37d11391 | 1154 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1155 | |
1156 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1157 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1158 | acpi_ec_clear(ec); |
5efc5476 | 1159 | return ret; |
1da177e4 LT |
1160 | } |
1161 | ||
51fac838 | 1162 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1163 | { |
01f22462 | 1164 | struct acpi_ec *ec; |
07ddf768 | 1165 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1166 | |
1da177e4 | 1167 | if (!device) |
d550d98d | 1168 | return -EINVAL; |
1da177e4 LT |
1169 | |
1170 | ec = acpi_driver_data(device); | |
cf745ec7 | 1171 | ec_remove_handlers(ec); |
f351d027 | 1172 | mutex_lock(&ec->mutex); |
07ddf768 | 1173 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1174 | list_del(&handler->node); |
1175 | kfree(handler); | |
1176 | } | |
f351d027 | 1177 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1178 | release_region(ec->data_addr, 1); |
1179 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1180 | device->driver_data = NULL; |
d033879c | 1181 | if (ec == first_ec) |
c0900c35 | 1182 | first_ec = NULL; |
4c611060 | 1183 | kfree(ec); |
d550d98d | 1184 | return 0; |
1da177e4 LT |
1185 | } |
1186 | ||
1da177e4 | 1187 | static acpi_status |
c0900c35 | 1188 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1189 | { |
3d02b90b | 1190 | struct acpi_ec *ec = context; |
1da177e4 | 1191 | |
01f22462 | 1192 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1193 | return AE_OK; |
1da177e4 LT |
1194 | |
1195 | /* | |
1196 | * The first address region returned is the data port, and | |
1197 | * the second address region returned is the status/command | |
1198 | * port. | |
1199 | */ | |
de4f1046 | 1200 | if (ec->data_addr == 0) |
6ffb221a | 1201 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1202 | else if (ec->command_addr == 0) |
6ffb221a | 1203 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1204 | else |
1da177e4 | 1205 | return AE_CTRL_TERMINATE; |
1da177e4 | 1206 | |
1da177e4 LT |
1207 | return AE_OK; |
1208 | } | |
1209 | ||
c04209a7 AS |
1210 | int __init acpi_boot_ec_enable(void) |
1211 | { | |
7c6db4e0 | 1212 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1213 | return 0; |
1214 | if (!ec_install_handlers(boot_ec)) { | |
1215 | first_ec = boot_ec; | |
1216 | return 0; | |
1217 | } | |
1218 | return -EFAULT; | |
1219 | } | |
1220 | ||
223883b7 AS |
1221 | static const struct acpi_device_id ec_device_ids[] = { |
1222 | {"PNP0C09", 0}, | |
1223 | {"", 0}, | |
1224 | }; | |
1225 | ||
478fa03b AS |
1226 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1227 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1228 | { | |
1229 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1230 | return 0; | |
1231 | } | |
1232 | ||
0adf3c74 AS |
1233 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1234 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1235 | { | |
1236 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | /* MSI EC needs special treatment, enable it */ | |
1241 | static int ec_flag_msi(const struct dmi_system_id *id) | |
1242 | { | |
16a26e85 | 1243 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
1244 | EC_FLAGS_MSI = 1; |
1245 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1246 | return 0; | |
1247 | } | |
1248 | ||
67bfa9b6 FT |
1249 | /* |
1250 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
1251 | * the GPE storm threshold back to 20 | |
1252 | */ | |
1253 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
1254 | { | |
1255 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
1256 | ec_storm_threshold = 20; | |
1257 | return 0; | |
1258 | } | |
1259 | ||
79149001 LZ |
1260 | /* |
1261 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1262 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1263 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1264 | */ | |
1265 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1266 | { | |
1267 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1268 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1269 | return 0; | |
1270 | } | |
1271 | ||
ad332c8a KC |
1272 | /* |
1273 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1274 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1275 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1276 | * | |
1277 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1278 | * | |
1279 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1280 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1281 | * behaviour is not known at this time. | |
1282 | * | |
1283 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1284 | * however it is very likely that other Samsung models are affected. | |
1285 | * | |
1286 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1287 | * should be harmless. | |
1288 | */ | |
1289 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1290 | { | |
1291 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1292 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1293 | return 0; | |
1294 | } | |
1295 | ||
6cef7497 | 1296 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1297 | { |
1298 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1299 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1300 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1301 | { |
1302 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1303 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1304 | { | |
1305 | ec_flag_msi, "MSI hardware", { | |
1306 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1307 | { | |
1308 | ec_flag_msi, "MSI hardware", { | |
1309 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1310 | { |
a5dc4f89 AS |
1311 | ec_flag_msi, "MSI hardware", { |
1312 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1313 | { | |
534bc4e3 ZR |
1314 | ec_flag_msi, "Quanta hardware", { |
1315 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1316 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1317 | { | |
1318 | ec_flag_msi, "Quanta hardware", { | |
1319 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1320 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1321 | { | |
777cb382 LT |
1322 | ec_flag_msi, "Clevo W350etq", { |
1323 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1324 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1325 | { | |
0adf3c74 AS |
1326 | ec_validate_ecdt, "ASUS hardware", { |
1327 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1328 | { |
1329 | ec_validate_ecdt, "ASUS hardware", { | |
1330 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1331 | { |
1332 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1333 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1334 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1335 | { |
1336 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1337 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1338 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1339 | { |
1340 | ec_validate_ecdt, "ASUS hardware", { | |
1341 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1342 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1343 | { |
1344 | ec_clear_on_resume, "Samsung hardware", { | |
1345 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1346 | { |
1347 | ec_flag_query_handshake, "Acer hardware", { | |
1348 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1349 | {}, |
1350 | }; | |
1351 | ||
c0900c35 AS |
1352 | int __init acpi_ec_ecdt_probe(void) |
1353 | { | |
c0900c35 | 1354 | acpi_status status; |
c6cb0e87 | 1355 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1356 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1357 | |
d66d969d AS |
1358 | boot_ec = make_acpi_ec(); |
1359 | if (!boot_ec) | |
c0900c35 AS |
1360 | return -ENOMEM; |
1361 | /* | |
1362 | * Generate a boot ec context | |
1363 | */ | |
0adf3c74 | 1364 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1365 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1366 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1367 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1368 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1369 | boot_ec->command_addr = ecdt_ptr->control.address; |
1370 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1371 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1372 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1373 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1374 | &boot_ec->handle); | |
c6cb0e87 | 1375 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1376 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1377 | goto install; |
d6bd535d | 1378 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1379 | if (!saved_ec) |
1380 | return -ENOMEM; | |
c5279dee | 1381 | /* fall through */ |
cd8c93a4 | 1382 | } |
0adf3c74 | 1383 | |
ed4b197d CIK |
1384 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1385 | kfree(saved_ec); | |
478fa03b | 1386 | return -ENODEV; |
ed4b197d | 1387 | } |
478fa03b | 1388 | |
c5279dee AS |
1389 | /* This workaround is needed only on some broken machines, |
1390 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1391 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1392 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1393 | boot_ec, NULL); | |
1394 | /* Check that acpi_get_devices actually find something */ | |
1395 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1396 | goto error; | |
c6cb0e87 AS |
1397 | if (saved_ec) { |
1398 | /* try to find good ECDT from ASUSTek */ | |
1399 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1400 | saved_ec->data_addr != boot_ec->data_addr || | |
1401 | saved_ec->gpe != boot_ec->gpe || | |
1402 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1403 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1404 | "ECDT tables, which are very hard to workaround. " |
1405 | "Trying to use DSDT EC info instead. Please send " | |
1406 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1407 | kfree(saved_ec); | |
1408 | saved_ec = NULL; | |
1409 | } else { | |
1410 | /* We really need to limit this workaround, the only ASUS, | |
1411 | * which needs it, has fake EC._INI method, so use it as flag. | |
1412 | * Keep boot_ec struct as it will be needed soon. | |
1413 | */ | |
c6cb0e87 | 1414 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1415 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1416 | return -ENODEV; |
1417 | } | |
c5279dee AS |
1418 | install: |
1419 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1420 | first_ec = boot_ec; |
e8284321 | 1421 | return 0; |
d033879c | 1422 | } |
c5279dee | 1423 | error: |
d66d969d | 1424 | kfree(boot_ec); |
ed4b197d | 1425 | kfree(saved_ec); |
d66d969d | 1426 | boot_ec = NULL; |
1da177e4 LT |
1427 | return -ENODEV; |
1428 | } | |
1429 | ||
223883b7 AS |
1430 | static struct acpi_driver acpi_ec_driver = { |
1431 | .name = "ec", | |
1432 | .class = ACPI_EC_CLASS, | |
1433 | .ids = ec_device_ids, | |
1434 | .ops = { | |
1435 | .add = acpi_ec_add, | |
1436 | .remove = acpi_ec_remove, | |
223883b7 AS |
1437 | }, |
1438 | }; | |
1439 | ||
a5f820fe | 1440 | int __init acpi_ec_init(void) |
1da177e4 | 1441 | { |
50526df6 | 1442 | int result = 0; |
1da177e4 | 1443 | |
1da177e4 LT |
1444 | /* Now register the driver for the EC */ |
1445 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1446 | if (result < 0) |
d550d98d | 1447 | return -ENODEV; |
1da177e4 | 1448 | |
d550d98d | 1449 | return result; |
1da177e4 LT |
1450 | } |
1451 | ||
1da177e4 LT |
1452 | /* EC driver currently not unloadable */ |
1453 | #if 0 | |
50526df6 | 1454 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1455 | { |
1da177e4 LT |
1456 | |
1457 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1458 | } |
7843932a | 1459 | #endif /* 0 */ |