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 { |
080e412c | 79 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 80 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 81 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 82 | * OpReg are installed */ |
ad479e7f LZ |
83 | EC_FLAGS_STARTED, /* Driver is started */ |
84 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
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; |
9e295ac1 | 123 | unsigned long timestamp; |
7c6db4e0 AS |
124 | }; |
125 | ||
550b3aac | 126 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 127 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 128 | |
1195a098 TR |
129 | struct acpi_ec *boot_ec, *first_ec; |
130 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 131 | |
5423a0cb | 132 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 133 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 134 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 135 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 136 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 137 | |
ad479e7f LZ |
138 | /* -------------------------------------------------------------------------- |
139 | * Device Flags | |
140 | * -------------------------------------------------------------------------- */ | |
141 | ||
142 | static bool acpi_ec_started(struct acpi_ec *ec) | |
143 | { | |
144 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
145 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
146 | } | |
147 | ||
9887d22a LZ |
148 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
149 | { | |
150 | return ec->reference_count == 1; | |
151 | } | |
152 | ||
1da177e4 | 153 | /* -------------------------------------------------------------------------- |
ca37bfdf | 154 | * EC Registers |
7a73e60e | 155 | * -------------------------------------------------------------------------- */ |
1da177e4 | 156 | |
6ffb221a | 157 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 158 | { |
3ebe08a7 | 159 | u8 x = inb(ec->command_addr); |
7a73e60e | 160 | |
dd43de20 LZ |
161 | pr_debug("EC_SC(R) = 0x%2.2x " |
162 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
163 | x, | |
164 | !!(x & ACPI_EC_FLAG_SCI), | |
165 | !!(x & ACPI_EC_FLAG_BURST), | |
166 | !!(x & ACPI_EC_FLAG_CMD), | |
167 | !!(x & ACPI_EC_FLAG_IBF), | |
168 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 169 | return x; |
451566f4 DT |
170 | } |
171 | ||
6ffb221a | 172 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 173 | { |
3ebe08a7 | 174 | u8 x = inb(ec->data_addr); |
7a73e60e | 175 | |
9e295ac1 | 176 | ec->curr->timestamp = jiffies; |
dd43de20 | 177 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 178 | return x; |
7c6db5e5 DS |
179 | } |
180 | ||
6ffb221a | 181 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 182 | { |
dd43de20 | 183 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 184 | outb(command, ec->command_addr); |
9e295ac1 | 185 | ec->curr->timestamp = jiffies; |
45bea155 LY |
186 | } |
187 | ||
6ffb221a | 188 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 189 | { |
dd43de20 | 190 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 191 | outb(data, ec->data_addr); |
9e295ac1 | 192 | ec->curr->timestamp = jiffies; |
703959d4 | 193 | } |
45bea155 | 194 | |
e34c0e2b LZ |
195 | #ifdef DEBUG |
196 | static const char *acpi_ec_cmd_string(u8 cmd) | |
197 | { | |
198 | switch (cmd) { | |
199 | case 0x80: | |
200 | return "RD_EC"; | |
201 | case 0x81: | |
202 | return "WR_EC"; | |
203 | case 0x82: | |
204 | return "BE_EC"; | |
205 | case 0x83: | |
206 | return "BD_EC"; | |
207 | case 0x84: | |
208 | return "QR_EC"; | |
209 | } | |
210 | return "UNKNOWN"; | |
211 | } | |
212 | #else | |
213 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
214 | #endif | |
215 | ||
ca37bfdf LZ |
216 | /* -------------------------------------------------------------------------- |
217 | * GPE Registers | |
218 | * -------------------------------------------------------------------------- */ | |
219 | ||
220 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
221 | { | |
222 | acpi_event_status gpe_status = 0; | |
223 | ||
224 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
225 | return (gpe_status & ACPI_EVENT_FLAG_SET) ? true : false; | |
226 | } | |
227 | ||
228 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
229 | { | |
230 | if (open) | |
231 | acpi_enable_gpe(NULL, ec->gpe); | |
232 | else | |
233 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); | |
234 | if (acpi_ec_is_gpe_raised(ec)) { | |
235 | /* | |
236 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
237 | * software need to manually trigger a pseudo GPE event on | |
238 | * EN=1 writes. | |
239 | */ | |
240 | pr_debug("***** Polling quirk *****\n"); | |
241 | advance_transaction(ec); | |
242 | } | |
243 | } | |
244 | ||
245 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
246 | { | |
247 | if (close) | |
248 | acpi_disable_gpe(NULL, ec->gpe); | |
249 | else | |
250 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); | |
251 | } | |
252 | ||
253 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
254 | { | |
255 | /* | |
256 | * GPE STS is a W1C register, which means: | |
257 | * 1. Software can clear it without worrying about clearing other | |
258 | * GPEs' STS bits when the hardware sets them in parallel. | |
259 | * 2. As long as software can ensure only clearing it when it is | |
260 | * set, hardware won't set it in parallel. | |
261 | * So software can clear GPE in any contexts. | |
262 | * Warning: do not move the check into advance_transaction() as the | |
263 | * EC commands will be sent without GPE raised. | |
264 | */ | |
265 | if (!acpi_ec_is_gpe_raised(ec)) | |
266 | return; | |
267 | acpi_clear_gpe(NULL, ec->gpe); | |
268 | } | |
269 | ||
270 | /* -------------------------------------------------------------------------- | |
271 | * Transaction Management | |
272 | * -------------------------------------------------------------------------- */ | |
273 | ||
9887d22a LZ |
274 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
275 | { | |
276 | ec->reference_count++; | |
277 | if (ec->reference_count == 1) | |
278 | acpi_ec_enable_gpe(ec, true); | |
279 | } | |
280 | ||
281 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
282 | { | |
283 | bool flushed = false; | |
284 | ||
285 | ec->reference_count--; | |
286 | if (ec->reference_count == 0) | |
287 | acpi_ec_disable_gpe(ec, true); | |
288 | flushed = acpi_ec_flushed(ec); | |
289 | if (flushed) | |
290 | wake_up(&ec->wait); | |
291 | } | |
292 | ||
293 | /* | |
294 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
295 | * the flush operation is not in | |
296 | * progress | |
297 | * @ec: the EC device | |
298 | * | |
299 | * This function must be used before taking a new action that should hold | |
300 | * the reference count. If this function returns false, then the action | |
301 | * must be discarded or it will prevent the flush operation from being | |
302 | * completed. | |
303 | */ | |
304 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) | |
305 | { | |
306 | if (!acpi_ec_started(ec)) | |
307 | return false; | |
308 | acpi_ec_submit_request(ec); | |
309 | return true; | |
310 | } | |
311 | ||
74443bbe LZ |
312 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
313 | { | |
314 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
315 | pr_debug("***** Event started *****\n"); | |
316 | schedule_work(&ec->work); | |
317 | } | |
318 | } | |
319 | ||
320 | static void acpi_ec_complete_query(struct acpi_ec *ec) | |
321 | { | |
322 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
323 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
324 | pr_debug("***** Event stopped *****\n"); | |
325 | } | |
326 | } | |
327 | ||
f92fca00 | 328 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 329 | { |
7c6db4e0 AS |
330 | unsigned long flags; |
331 | int ret = 0; | |
7a73e60e | 332 | |
f351d027 | 333 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 334 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 335 | ret = 1; |
f351d027 | 336 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 337 | return ret; |
45bea155 | 338 | } |
451566f4 | 339 | |
0c78808f | 340 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 341 | { |
36b15875 | 342 | struct transaction *t; |
66b42b78 | 343 | u8 status; |
c0d65341 | 344 | bool wakeup = false; |
b76b51ba | 345 | |
c95f25b0 LZ |
346 | pr_debug("===== %s (%d) =====\n", |
347 | in_interrupt() ? "IRQ" : "TASK", smp_processor_id()); | |
ca37bfdf LZ |
348 | /* |
349 | * By always clearing STS before handling all indications, we can | |
350 | * ensure a hardware STS 0->1 change after this clearing can always | |
351 | * trigger a GPE interrupt. | |
352 | */ | |
353 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 354 | status = acpi_ec_read_status(ec); |
36b15875 | 355 | t = ec->curr; |
b76b51ba | 356 | if (!t) |
f92fca00 LZ |
357 | goto err; |
358 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
359 | if (t->wlen > t->wi) { | |
360 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
361 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
362 | else | |
363 | goto err; | |
364 | } else if (t->rlen > t->ri) { | |
365 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
366 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 367 | if (t->rlen == t->ri) { |
f92fca00 | 368 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 369 | if (t->command == ACPI_EC_COMMAND_QUERY) |
e34c0e2b LZ |
370 | pr_debug("***** Command(%s) hardware completion *****\n", |
371 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
372 | wakeup = true; |
373 | } | |
f92fca00 LZ |
374 | } else |
375 | goto err; | |
376 | } else if (t->wlen == t->wi && | |
c0d65341 | 377 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 378 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
379 | wakeup = true; |
380 | } | |
0c78808f | 381 | goto out; |
f92fca00 | 382 | } else { |
79149001 LZ |
383 | if (EC_FLAGS_QUERY_HANDSHAKE && |
384 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
385 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
386 | t->flags |= ACPI_EC_COMMAND_POLL; | |
74443bbe | 387 | acpi_ec_complete_query(ec); |
3afcf2ec LZ |
388 | t->rdata[t->ri++] = 0x00; |
389 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
e34c0e2b LZ |
390 | pr_debug("***** Command(%s) software completion *****\n", |
391 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
392 | wakeup = true; |
393 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
394 | acpi_ec_write_cmd(ec, t->command); |
395 | t->flags |= ACPI_EC_COMMAND_POLL; | |
74443bbe | 396 | acpi_ec_complete_query(ec); |
7c6db4e0 | 397 | } else |
dd15f8c4 | 398 | goto err; |
0c78808f | 399 | goto out; |
f92fca00 | 400 | } |
dd15f8c4 | 401 | err: |
a3cd8d27 FT |
402 | /* |
403 | * If SCI bit is set, then don't think it's a false IRQ | |
404 | * otherwise will take a not handled IRQ as a false one. | |
405 | */ | |
f92fca00 LZ |
406 | if (!(status & ACPI_EC_FLAG_SCI)) { |
407 | if (in_interrupt() && t) | |
408 | ++t->irq_count; | |
409 | } | |
0c78808f | 410 | out: |
74443bbe LZ |
411 | if (status & ACPI_EC_FLAG_SCI) |
412 | acpi_ec_submit_query(ec); | |
0c78808f LZ |
413 | if (wakeup && in_interrupt()) |
414 | wake_up(&ec->wait); | |
f92fca00 | 415 | } |
a3cd8d27 | 416 | |
f92fca00 LZ |
417 | static void start_transaction(struct acpi_ec *ec) |
418 | { | |
419 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
420 | ec->curr->flags = 0; | |
9e295ac1 | 421 | ec->curr->timestamp = jiffies; |
0c78808f | 422 | advance_transaction(ec); |
845625cd | 423 | } |
03d1d99c | 424 | |
7c6db4e0 AS |
425 | static int ec_poll(struct acpi_ec *ec) |
426 | { | |
2a84cb98 | 427 | unsigned long flags; |
28fe5c82 | 428 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 429 | |
2a84cb98 AS |
430 | while (repeat--) { |
431 | unsigned long delay = jiffies + | |
7a18e96d | 432 | msecs_to_jiffies(ec_delay); |
9e295ac1 | 433 | unsigned long usecs = ACPI_EC_UDELAY_POLL; |
2a84cb98 AS |
434 | do { |
435 | /* don't sleep with disabled interrupts */ | |
436 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
9e295ac1 LZ |
437 | usecs = ACPI_EC_MSI_UDELAY; |
438 | udelay(usecs); | |
f92fca00 | 439 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
440 | return 0; |
441 | } else { | |
442 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 443 | ec_transaction_completed(ec), |
9e295ac1 | 444 | usecs_to_jiffies(usecs))) |
2a84cb98 AS |
445 | return 0; |
446 | } | |
f92fca00 | 447 | spin_lock_irqsave(&ec->lock, flags); |
9e295ac1 LZ |
448 | if (time_after(jiffies, |
449 | ec->curr->timestamp + | |
450 | usecs_to_jiffies(usecs))) | |
451 | advance_transaction(ec); | |
f92fca00 | 452 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 453 | } while (time_before(jiffies, delay)); |
16a26e85 | 454 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 455 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 456 | start_transaction(ec); |
f351d027 | 457 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 458 | } |
b77d81b2 | 459 | return -ETIME; |
1da177e4 LT |
460 | } |
461 | ||
8463200a | 462 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 463 | struct transaction *t) |
45bea155 | 464 | { |
7c6db4e0 | 465 | unsigned long tmp; |
7c6db4e0 | 466 | int ret = 0; |
7a73e60e | 467 | |
5423a0cb | 468 | if (EC_FLAGS_MSI) |
2a84cb98 | 469 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 470 | /* start transaction */ |
f351d027 | 471 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a LZ |
472 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
473 | if (!acpi_ec_submit_flushable_request(ec)) { | |
ad479e7f LZ |
474 | ret = -EINVAL; |
475 | goto unlock; | |
476 | } | |
7c6db4e0 | 477 | /* following two actions should be kept atomic */ |
8463200a | 478 | ec->curr = t; |
e34c0e2b LZ |
479 | pr_debug("***** Command(%s) started *****\n", |
480 | acpi_ec_cmd_string(t->command)); | |
a2f93aea | 481 | start_transaction(ec); |
df9ff918 LZ |
482 | spin_unlock_irqrestore(&ec->lock, tmp); |
483 | ret = ec_poll(ec); | |
484 | spin_lock_irqsave(&ec->lock, tmp); | |
e34c0e2b LZ |
485 | pr_debug("***** Command(%s) stopped *****\n", |
486 | acpi_ec_cmd_string(t->command)); | |
8463200a | 487 | ec->curr = NULL; |
9887d22a LZ |
488 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
489 | acpi_ec_complete_request(ec); | |
ad479e7f | 490 | unlock: |
f351d027 | 491 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
492 | return ret; |
493 | } | |
494 | ||
2a84cb98 | 495 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 496 | { |
d7a76e4c | 497 | int status; |
50526df6 | 498 | u32 glk; |
7a73e60e | 499 | |
8463200a | 500 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 501 | return -EINVAL; |
8463200a AS |
502 | if (t->rdata) |
503 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 504 | mutex_lock(&ec->mutex); |
703959d4 | 505 | if (ec->global_lock) { |
1da177e4 | 506 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 507 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
508 | status = -ENODEV; |
509 | goto unlock; | |
c24e912b | 510 | } |
1da177e4 | 511 | } |
a62e8f19 AS |
512 | /* disable GPE during transaction if storm is detected */ |
513 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b | 514 | /* It has to be disabled, so that it doesn't trigger. */ |
ca37bfdf | 515 | acpi_ec_disable_gpe(ec, false); |
a62e8f19 AS |
516 | } |
517 | ||
2a84cb98 | 518 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 519 | |
a62e8f19 | 520 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
54070101 | 521 | msleep(1); |
3784730b | 522 | /* It is safe to enable the GPE outside of the transaction. */ |
ca37bfdf | 523 | acpi_ec_enable_gpe(ec, false); |
a520d52e | 524 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 525 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
526 | "transactions will use polling mode\n", |
527 | t->irq_count); | |
a62e8f19 AS |
528 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
529 | } | |
703959d4 | 530 | if (ec->global_lock) |
1da177e4 | 531 | acpi_release_global_lock(glk); |
7c6db4e0 | 532 | unlock: |
f351d027 | 533 | mutex_unlock(&ec->mutex); |
d550d98d | 534 | return status; |
1da177e4 LT |
535 | } |
536 | ||
8a383ef0 | 537 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
538 | { |
539 | u8 d; | |
8463200a AS |
540 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
541 | .wdata = NULL, .rdata = &d, | |
542 | .wlen = 0, .rlen = 1}; | |
543 | ||
2a84cb98 | 544 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
545 | } |
546 | ||
8a383ef0 | 547 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 548 | { |
8463200a AS |
549 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
550 | .wdata = NULL, .rdata = NULL, | |
551 | .wlen = 0, .rlen = 0}; | |
552 | ||
7c6db4e0 | 553 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 554 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
555 | } |
556 | ||
7a73e60e | 557 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
558 | { |
559 | int result; | |
560 | u8 d; | |
8463200a AS |
561 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
562 | .wdata = &address, .rdata = &d, | |
563 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 564 | |
2a84cb98 | 565 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
566 | *data = d; |
567 | return result; | |
568 | } | |
6ffb221a | 569 | |
3576cf61 DS |
570 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
571 | { | |
6ccedb10 | 572 | u8 wdata[2] = { address, data }; |
8463200a AS |
573 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
574 | .wdata = wdata, .rdata = NULL, | |
575 | .wlen = 2, .rlen = 0}; | |
576 | ||
2a84cb98 | 577 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
578 | } |
579 | ||
b76b51ba | 580 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 581 | { |
1da177e4 | 582 | int err; |
6ffb221a | 583 | u8 temp_data; |
1da177e4 LT |
584 | |
585 | if (!first_ec) | |
586 | return -ENODEV; | |
587 | ||
d033879c | 588 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
589 | |
590 | if (!err) { | |
591 | *val = temp_data; | |
592 | return 0; | |
7a73e60e LZ |
593 | } |
594 | return err; | |
1da177e4 LT |
595 | } |
596 | EXPORT_SYMBOL(ec_read); | |
597 | ||
50526df6 | 598 | int ec_write(u8 addr, u8 val) |
1da177e4 | 599 | { |
1da177e4 LT |
600 | int err; |
601 | ||
602 | if (!first_ec) | |
603 | return -ENODEV; | |
604 | ||
d033879c | 605 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
606 | |
607 | return err; | |
608 | } | |
609 | EXPORT_SYMBOL(ec_write); | |
610 | ||
616362de | 611 | int ec_transaction(u8 command, |
7a73e60e LZ |
612 | const u8 *wdata, unsigned wdata_len, |
613 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 614 | { |
8463200a AS |
615 | struct transaction t = {.command = command, |
616 | .wdata = wdata, .rdata = rdata, | |
617 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 618 | |
d7a76e4c LP |
619 | if (!first_ec) |
620 | return -ENODEV; | |
45bea155 | 621 | |
2a84cb98 | 622 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 623 | } |
ab9e43c6 LP |
624 | EXPORT_SYMBOL(ec_transaction); |
625 | ||
3e2abc5a SF |
626 | /* Get the handle to the EC device */ |
627 | acpi_handle ec_get_handle(void) | |
628 | { | |
629 | if (!first_ec) | |
630 | return NULL; | |
631 | return first_ec->handle; | |
632 | } | |
3e2abc5a SF |
633 | EXPORT_SYMBOL(ec_get_handle); |
634 | ||
ad332c8a | 635 | /* |
3eba563e | 636 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
637 | * Run with locked ec mutex. |
638 | */ | |
639 | static void acpi_ec_clear(struct acpi_ec *ec) | |
640 | { | |
641 | int i, status; | |
642 | u8 value = 0; | |
643 | ||
644 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 645 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
646 | if (status || !value) |
647 | break; | |
648 | } | |
649 | ||
650 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
651 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
652 | else | |
653 | pr_info("%d stale EC events cleared\n", i); | |
654 | } | |
655 | ||
ad479e7f LZ |
656 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
657 | { | |
658 | unsigned long flags; | |
659 | ||
660 | spin_lock_irqsave(&ec->lock, flags); | |
661 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
662 | pr_debug("+++++ Starting EC +++++\n"); | |
9887d22a | 663 | /* Enable GPE for event processing (SCI_EVT=1) */ |
ad479e7f | 664 | if (!resuming) |
9887d22a | 665 | acpi_ec_submit_request(ec); |
ad479e7f LZ |
666 | pr_info("+++++ EC started +++++\n"); |
667 | } | |
668 | spin_unlock_irqrestore(&ec->lock, flags); | |
669 | } | |
670 | ||
9887d22a LZ |
671 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
672 | { | |
673 | unsigned long flags; | |
674 | bool flushed; | |
675 | ||
676 | spin_lock_irqsave(&ec->lock, flags); | |
677 | flushed = acpi_ec_flushed(ec); | |
678 | spin_unlock_irqrestore(&ec->lock, flags); | |
679 | return flushed; | |
680 | } | |
681 | ||
ad479e7f LZ |
682 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
683 | { | |
684 | unsigned long flags; | |
685 | ||
686 | spin_lock_irqsave(&ec->lock, flags); | |
687 | if (acpi_ec_started(ec)) { | |
688 | pr_debug("+++++ Stopping EC +++++\n"); | |
689 | set_bit(EC_FLAGS_STOPPED, &ec->flags); | |
9887d22a LZ |
690 | spin_unlock_irqrestore(&ec->lock, flags); |
691 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
692 | spin_lock_irqsave(&ec->lock, flags); | |
693 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
ad479e7f | 694 | if (!suspending) |
9887d22a | 695 | acpi_ec_complete_request(ec); |
ad479e7f LZ |
696 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
697 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
698 | pr_info("+++++ EC stopped +++++\n"); | |
699 | } | |
700 | spin_unlock_irqrestore(&ec->lock, flags); | |
701 | } | |
702 | ||
fe955682 | 703 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
704 | { |
705 | struct acpi_ec *ec = first_ec; | |
706 | ||
707 | if (!ec) | |
708 | return; | |
709 | ||
f351d027 | 710 | mutex_lock(&ec->mutex); |
f6bb13aa | 711 | /* Prevent transactions from being carried out */ |
ad479e7f | 712 | acpi_ec_stop(ec, true); |
f351d027 | 713 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
714 | } |
715 | ||
fe955682 | 716 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
717 | { |
718 | struct acpi_ec *ec = first_ec; | |
719 | ||
720 | if (!ec) | |
721 | return; | |
722 | ||
f6bb13aa | 723 | /* Allow transactions to be carried out again */ |
ad479e7f | 724 | acpi_ec_start(ec, true); |
ad332c8a KC |
725 | |
726 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
727 | acpi_ec_clear(ec); | |
f6bb13aa RW |
728 | } |
729 | ||
fe955682 | 730 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
731 | { |
732 | /* | |
733 | * Allow transactions to happen again (this function is called from | |
734 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
735 | */ | |
736 | if (first_ec) | |
ad479e7f | 737 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
738 | } |
739 | ||
1da177e4 LT |
740 | /* -------------------------------------------------------------------------- |
741 | Event Management | |
742 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
743 | static struct acpi_ec_query_handler * |
744 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
745 | { | |
746 | if (handler) | |
747 | kref_get(&handler->kref); | |
748 | return handler; | |
749 | } | |
750 | ||
751 | static void acpi_ec_query_handler_release(struct kref *kref) | |
752 | { | |
753 | struct acpi_ec_query_handler *handler = | |
754 | container_of(kref, struct acpi_ec_query_handler, kref); | |
755 | ||
756 | kfree(handler); | |
757 | } | |
758 | ||
759 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
760 | { | |
761 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
762 | } | |
763 | ||
837012ed AS |
764 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
765 | acpi_handle handle, acpi_ec_query_func func, | |
766 | void *data) | |
767 | { | |
768 | struct acpi_ec_query_handler *handler = | |
769 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 770 | |
837012ed AS |
771 | if (!handler) |
772 | return -ENOMEM; | |
773 | ||
774 | handler->query_bit = query_bit; | |
775 | handler->handle = handle; | |
776 | handler->func = func; | |
777 | handler->data = data; | |
f351d027 | 778 | mutex_lock(&ec->mutex); |
01305d41 | 779 | kref_init(&handler->kref); |
30c08574 | 780 | list_add(&handler->node, &ec->list); |
f351d027 | 781 | mutex_unlock(&ec->mutex); |
837012ed AS |
782 | return 0; |
783 | } | |
837012ed AS |
784 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
785 | ||
786 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
787 | { | |
1544fdbc | 788 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 789 | LIST_HEAD(free_list); |
7a73e60e | 790 | |
f351d027 | 791 | mutex_lock(&ec->mutex); |
1544fdbc | 792 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 793 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
794 | list_del_init(&handler->node); |
795 | list_add(&handler->node, &free_list); | |
837012ed AS |
796 | } |
797 | } | |
f351d027 | 798 | mutex_unlock(&ec->mutex); |
01305d41 LZ |
799 | list_for_each_entry(handler, &free_list, node) |
800 | acpi_ec_put_query_handler(handler); | |
837012ed | 801 | } |
837012ed | 802 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 803 | |
a62e8f19 | 804 | static void acpi_ec_run(void *cxt) |
45bea155 | 805 | { |
a62e8f19 | 806 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 807 | |
a62e8f19 | 808 | if (!handler) |
e41334c0 | 809 | return; |
d3090b6a | 810 | pr_debug("##### Query(0x%02x) started #####\n", handler->query_bit); |
a62e8f19 AS |
811 | if (handler->func) |
812 | handler->func(handler->data); | |
813 | else if (handler->handle) | |
814 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
d3090b6a | 815 | pr_debug("##### Query(0x%02x) stopped #####\n", handler->query_bit); |
01305d41 | 816 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
817 | } |
818 | ||
550b3aac | 819 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
820 | { |
821 | u8 value = 0; | |
c2cf5769 LZ |
822 | int result; |
823 | acpi_status status; | |
01305d41 | 824 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
825 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
826 | .wdata = NULL, .rdata = &value, | |
827 | .wlen = 0, .rlen = 1}; | |
3eba563e | 828 | |
550b3aac LZ |
829 | /* |
830 | * Query the EC to find out which _Qxx method we need to evaluate. | |
831 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
832 | * bit to be cleared (and thus clearing the interrupt source). | |
833 | */ | |
834 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
835 | if (result) |
836 | return result; | |
550b3aac LZ |
837 | if (data) |
838 | *data = value; | |
839 | if (!value) | |
840 | return -ENODATA; | |
3eba563e | 841 | |
550b3aac | 842 | mutex_lock(&ec->mutex); |
837012ed AS |
843 | list_for_each_entry(handler, &ec->list, node) { |
844 | if (value == handler->query_bit) { | |
845 | /* have custom handler for this bit */ | |
01305d41 | 846 | handler = acpi_ec_get_query_handler(handler); |
d3090b6a LZ |
847 | pr_debug("##### Query(0x%02x) scheduled #####\n", |
848 | handler->query_bit); | |
c2cf5769 | 849 | status = acpi_os_execute((handler->func) ? |
f5347867 | 850 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 851 | acpi_ec_run, handler); |
c2cf5769 LZ |
852 | if (ACPI_FAILURE(status)) |
853 | result = -EBUSY; | |
854 | break; | |
837012ed AS |
855 | } |
856 | } | |
550b3aac | 857 | mutex_unlock(&ec->mutex); |
c2cf5769 | 858 | return result; |
a62e8f19 AS |
859 | } |
860 | ||
74443bbe | 861 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 862 | { |
74443bbe | 863 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 864 | |
550b3aac | 865 | acpi_ec_query(ec, NULL); |
45bea155 | 866 | } |
1da177e4 | 867 | |
8b6cd8ad LM |
868 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
869 | u32 gpe_number, void *data) | |
1da177e4 | 870 | { |
f92fca00 | 871 | unsigned long flags; |
3d02b90b | 872 | struct acpi_ec *ec = data; |
7c6db4e0 | 873 | |
f92fca00 | 874 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 875 | advance_transaction(ec); |
c0d65341 | 876 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 877 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
878 | } |
879 | ||
1da177e4 | 880 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
881 | * Address Space Management |
882 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 883 | |
1da177e4 | 884 | static acpi_status |
5b7734b4 | 885 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 886 | u32 bits, u64 *value64, |
50526df6 | 887 | void *handler_context, void *region_context) |
1da177e4 | 888 | { |
3d02b90b | 889 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
890 | int result = 0, i, bytes = bits / 8; |
891 | u8 *value = (u8 *)value64; | |
1da177e4 | 892 | |
1da177e4 | 893 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 894 | return AE_BAD_PARAMETER; |
1da177e4 | 895 | |
5b7734b4 | 896 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 897 | return AE_BAD_PARAMETER; |
1da177e4 | 898 | |
dadf28a1 | 899 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 900 | acpi_ec_burst_enable(ec); |
b3b233c7 | 901 | |
dadf28a1 AS |
902 | for (i = 0; i < bytes; ++i, ++address, ++value) |
903 | result = (function == ACPI_READ) ? | |
904 | acpi_ec_read(ec, address, value) : | |
905 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 906 | |
dadf28a1 | 907 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 908 | acpi_ec_burst_disable(ec); |
b3b233c7 | 909 | |
1da177e4 LT |
910 | switch (result) { |
911 | case -EINVAL: | |
d550d98d | 912 | return AE_BAD_PARAMETER; |
1da177e4 | 913 | case -ENODEV: |
d550d98d | 914 | return AE_NOT_FOUND; |
1da177e4 | 915 | case -ETIME: |
d550d98d | 916 | return AE_TIME; |
1da177e4 | 917 | default: |
d550d98d | 918 | return AE_OK; |
1da177e4 | 919 | } |
1da177e4 LT |
920 | } |
921 | ||
1da177e4 | 922 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
923 | * Driver Interface |
924 | * -------------------------------------------------------------------------- */ | |
925 | ||
c0900c35 AS |
926 | static acpi_status |
927 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
928 | ||
c0900c35 AS |
929 | static struct acpi_ec *make_acpi_ec(void) |
930 | { | |
931 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 932 | |
c0900c35 AS |
933 | if (!ec) |
934 | return NULL; | |
080e412c | 935 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 936 | mutex_init(&ec->mutex); |
c0900c35 | 937 | init_waitqueue_head(&ec->wait); |
837012ed | 938 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 939 | spin_lock_init(&ec->lock); |
74443bbe | 940 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
c0900c35 AS |
941 | return ec; |
942 | } | |
837012ed | 943 | |
c019b193 AS |
944 | static acpi_status |
945 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
946 | void *context, void **return_value) | |
947 | { | |
0175d562 LM |
948 | char node_name[5]; |
949 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
950 | struct acpi_ec *ec = context; |
951 | int value = 0; | |
0175d562 LM |
952 | acpi_status status; |
953 | ||
954 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
955 | ||
7a73e60e | 956 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 957 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
958 | return AE_OK; |
959 | } | |
960 | ||
cd8c93a4 AS |
961 | static acpi_status |
962 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 963 | { |
cd8c93a4 | 964 | acpi_status status; |
d21cf3c1 | 965 | unsigned long long tmp = 0; |
cd8c93a4 | 966 | struct acpi_ec *ec = context; |
a5032bfd AS |
967 | |
968 | /* clear addr values, ec_parse_io_ports depend on it */ | |
969 | ec->command_addr = ec->data_addr = 0; | |
970 | ||
cd8c93a4 AS |
971 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
972 | ec_parse_io_ports, ec); | |
973 | if (ACPI_FAILURE(status)) | |
974 | return status; | |
837012ed AS |
975 | |
976 | /* Get GPE bit assignment (EC events). */ | |
977 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 978 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
979 | if (ACPI_FAILURE(status)) |
980 | return status; | |
27663c58 | 981 | ec->gpe = tmp; |
837012ed | 982 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 983 | tmp = 0; |
27663c58 MW |
984 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
985 | ec->global_lock = tmp; | |
837012ed | 986 | ec->handle = handle; |
cd8c93a4 | 987 | return AE_CTRL_TERMINATE; |
837012ed AS |
988 | } |
989 | ||
5efc5476 BH |
990 | static int ec_install_handlers(struct acpi_ec *ec) |
991 | { | |
992 | acpi_status status; | |
7a73e60e | 993 | |
5efc5476 BH |
994 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
995 | return 0; | |
ca37bfdf | 996 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
997 | ACPI_GPE_EDGE_TRIGGERED, |
998 | &acpi_ec_gpe_handler, ec); | |
999 | if (ACPI_FAILURE(status)) | |
1000 | return -ENODEV; | |
9630bdd9 | 1001 | |
ad479e7f | 1002 | acpi_ec_start(ec, false); |
5efc5476 BH |
1003 | status = acpi_install_address_space_handler(ec->handle, |
1004 | ACPI_ADR_SPACE_EC, | |
1005 | &acpi_ec_space_handler, | |
1006 | NULL, ec); | |
1007 | if (ACPI_FAILURE(status)) { | |
1008 | if (status == AE_NOT_FOUND) { | |
1009 | /* | |
1010 | * Maybe OS fails in evaluating the _REG object. | |
1011 | * The AE_NOT_FOUND error will be ignored and OS | |
1012 | * continue to initialize EC. | |
1013 | */ | |
16a26e85 | 1014 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1015 | " of EC device. Broken bios is suspected.\n"); |
1016 | } else { | |
ad479e7f | 1017 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1018 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1019 | &acpi_ec_gpe_handler); | |
1020 | return -ENODEV; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1025 | return 0; | |
1026 | } | |
1027 | ||
4c611060 AS |
1028 | static void ec_remove_handlers(struct acpi_ec *ec) |
1029 | { | |
1741acea LZ |
1030 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1031 | return; | |
ad479e7f | 1032 | acpi_ec_stop(ec, false); |
4c611060 AS |
1033 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1034 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1035 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1036 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1037 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1038 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1039 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1040 | } |
1041 | ||
703959d4 | 1042 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1043 | { |
703959d4 | 1044 | struct acpi_ec *ec = NULL; |
d02be047 | 1045 | int ret; |
45bea155 | 1046 | |
c0900c35 AS |
1047 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1048 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1049 | ||
4c611060 | 1050 | /* Check for boot EC */ |
ce52ddf5 AS |
1051 | if (boot_ec && |
1052 | (boot_ec->handle == device->handle || | |
1053 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1054 | ec = boot_ec; | |
1055 | boot_ec = NULL; | |
1056 | } else { | |
1057 | ec = make_acpi_ec(); | |
1058 | if (!ec) | |
1059 | return -ENOMEM; | |
a5032bfd AS |
1060 | } |
1061 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1062 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1063 | kfree(ec); |
1064 | return -EINVAL; | |
4c611060 AS |
1065 | } |
1066 | ||
ce52ddf5 AS |
1067 | /* Find and register all query methods */ |
1068 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1069 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1070 | |
4c611060 AS |
1071 | if (!first_ec) |
1072 | first_ec = ec; | |
db89b4f0 | 1073 | device->driver_data = ec; |
de4f1046 | 1074 | |
d6795fe3 AK |
1075 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1076 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1077 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1078 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1079 | |
16a26e85 | 1080 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1081 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1082 | |
1083 | ret = ec_install_handlers(ec); | |
1084 | ||
1085 | /* EC is fully operational, allow queries */ | |
1086 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
1087 | |
1088 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1089 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1090 | acpi_ec_clear(ec); |
5efc5476 | 1091 | return ret; |
1da177e4 LT |
1092 | } |
1093 | ||
51fac838 | 1094 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1095 | { |
01f22462 | 1096 | struct acpi_ec *ec; |
07ddf768 | 1097 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1098 | |
1da177e4 | 1099 | if (!device) |
d550d98d | 1100 | return -EINVAL; |
1da177e4 LT |
1101 | |
1102 | ec = acpi_driver_data(device); | |
cf745ec7 | 1103 | ec_remove_handlers(ec); |
f351d027 | 1104 | mutex_lock(&ec->mutex); |
07ddf768 | 1105 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1106 | list_del(&handler->node); |
1107 | kfree(handler); | |
1108 | } | |
f351d027 | 1109 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1110 | release_region(ec->data_addr, 1); |
1111 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1112 | device->driver_data = NULL; |
d033879c | 1113 | if (ec == first_ec) |
c0900c35 | 1114 | first_ec = NULL; |
4c611060 | 1115 | kfree(ec); |
d550d98d | 1116 | return 0; |
1da177e4 LT |
1117 | } |
1118 | ||
1da177e4 | 1119 | static acpi_status |
c0900c35 | 1120 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1121 | { |
3d02b90b | 1122 | struct acpi_ec *ec = context; |
1da177e4 | 1123 | |
01f22462 | 1124 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1125 | return AE_OK; |
1da177e4 LT |
1126 | |
1127 | /* | |
1128 | * The first address region returned is the data port, and | |
1129 | * the second address region returned is the status/command | |
1130 | * port. | |
1131 | */ | |
de4f1046 | 1132 | if (ec->data_addr == 0) |
6ffb221a | 1133 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1134 | else if (ec->command_addr == 0) |
6ffb221a | 1135 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1136 | else |
1da177e4 | 1137 | return AE_CTRL_TERMINATE; |
1da177e4 | 1138 | |
1da177e4 LT |
1139 | return AE_OK; |
1140 | } | |
1141 | ||
c04209a7 AS |
1142 | int __init acpi_boot_ec_enable(void) |
1143 | { | |
7c6db4e0 | 1144 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1145 | return 0; |
1146 | if (!ec_install_handlers(boot_ec)) { | |
1147 | first_ec = boot_ec; | |
1148 | return 0; | |
1149 | } | |
1150 | return -EFAULT; | |
1151 | } | |
1152 | ||
223883b7 AS |
1153 | static const struct acpi_device_id ec_device_ids[] = { |
1154 | {"PNP0C09", 0}, | |
1155 | {"", 0}, | |
1156 | }; | |
1157 | ||
478fa03b AS |
1158 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1159 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1160 | { | |
1161 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1162 | return 0; | |
1163 | } | |
1164 | ||
0adf3c74 AS |
1165 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1166 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1167 | { | |
1168 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | /* MSI EC needs special treatment, enable it */ | |
1173 | static int ec_flag_msi(const struct dmi_system_id *id) | |
1174 | { | |
16a26e85 | 1175 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
1176 | EC_FLAGS_MSI = 1; |
1177 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1178 | return 0; | |
1179 | } | |
1180 | ||
67bfa9b6 FT |
1181 | /* |
1182 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
1183 | * the GPE storm threshold back to 20 | |
1184 | */ | |
1185 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
1186 | { | |
1187 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
1188 | ec_storm_threshold = 20; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
79149001 LZ |
1192 | /* |
1193 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1194 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1195 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1196 | */ | |
1197 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1198 | { | |
1199 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1200 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1201 | return 0; | |
1202 | } | |
1203 | ||
ad332c8a KC |
1204 | /* |
1205 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1206 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1207 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1208 | * | |
1209 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1210 | * | |
1211 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1212 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1213 | * behaviour is not known at this time. | |
1214 | * | |
1215 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1216 | * however it is very likely that other Samsung models are affected. | |
1217 | * | |
1218 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1219 | * should be harmless. | |
1220 | */ | |
1221 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1222 | { | |
1223 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1224 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1225 | return 0; | |
1226 | } | |
1227 | ||
6cef7497 | 1228 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1229 | { |
1230 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1231 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1232 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1233 | { |
1234 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1235 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1236 | { | |
1237 | ec_flag_msi, "MSI hardware", { | |
1238 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1239 | { | |
1240 | ec_flag_msi, "MSI hardware", { | |
1241 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1242 | { |
a5dc4f89 AS |
1243 | ec_flag_msi, "MSI hardware", { |
1244 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1245 | { | |
534bc4e3 ZR |
1246 | ec_flag_msi, "Quanta hardware", { |
1247 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1248 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1249 | { | |
1250 | ec_flag_msi, "Quanta hardware", { | |
1251 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1252 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1253 | { | |
777cb382 LT |
1254 | ec_flag_msi, "Clevo W350etq", { |
1255 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1256 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1257 | { | |
0adf3c74 AS |
1258 | ec_validate_ecdt, "ASUS hardware", { |
1259 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1260 | { |
1261 | ec_validate_ecdt, "ASUS hardware", { | |
1262 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1263 | { |
1264 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1265 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1266 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1267 | { |
1268 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1269 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1270 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1271 | { |
1272 | ec_validate_ecdt, "ASUS hardware", { | |
1273 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1274 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1275 | { |
1276 | ec_clear_on_resume, "Samsung hardware", { | |
1277 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1278 | { |
1279 | ec_flag_query_handshake, "Acer hardware", { | |
1280 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1281 | {}, |
1282 | }; | |
1283 | ||
c0900c35 AS |
1284 | int __init acpi_ec_ecdt_probe(void) |
1285 | { | |
c0900c35 | 1286 | acpi_status status; |
c6cb0e87 | 1287 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1288 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1289 | |
d66d969d AS |
1290 | boot_ec = make_acpi_ec(); |
1291 | if (!boot_ec) | |
c0900c35 AS |
1292 | return -ENOMEM; |
1293 | /* | |
1294 | * Generate a boot ec context | |
1295 | */ | |
0adf3c74 | 1296 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1297 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1298 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1299 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1300 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1301 | boot_ec->command_addr = ecdt_ptr->control.address; |
1302 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1303 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1304 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1305 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1306 | &boot_ec->handle); | |
c6cb0e87 | 1307 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1308 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1309 | goto install; |
d6bd535d | 1310 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1311 | if (!saved_ec) |
1312 | return -ENOMEM; | |
c5279dee | 1313 | /* fall through */ |
cd8c93a4 | 1314 | } |
0adf3c74 | 1315 | |
ed4b197d CIK |
1316 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1317 | kfree(saved_ec); | |
478fa03b | 1318 | return -ENODEV; |
ed4b197d | 1319 | } |
478fa03b | 1320 | |
c5279dee AS |
1321 | /* This workaround is needed only on some broken machines, |
1322 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1323 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1324 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1325 | boot_ec, NULL); | |
1326 | /* Check that acpi_get_devices actually find something */ | |
1327 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1328 | goto error; | |
c6cb0e87 AS |
1329 | if (saved_ec) { |
1330 | /* try to find good ECDT from ASUSTek */ | |
1331 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1332 | saved_ec->data_addr != boot_ec->data_addr || | |
1333 | saved_ec->gpe != boot_ec->gpe || | |
1334 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1335 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1336 | "ECDT tables, which are very hard to workaround. " |
1337 | "Trying to use DSDT EC info instead. Please send " | |
1338 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1339 | kfree(saved_ec); | |
1340 | saved_ec = NULL; | |
1341 | } else { | |
1342 | /* We really need to limit this workaround, the only ASUS, | |
1343 | * which needs it, has fake EC._INI method, so use it as flag. | |
1344 | * Keep boot_ec struct as it will be needed soon. | |
1345 | */ | |
c6cb0e87 | 1346 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1347 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1348 | return -ENODEV; |
1349 | } | |
c5279dee AS |
1350 | install: |
1351 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1352 | first_ec = boot_ec; |
e8284321 | 1353 | return 0; |
d033879c | 1354 | } |
c5279dee | 1355 | error: |
d66d969d | 1356 | kfree(boot_ec); |
ed4b197d | 1357 | kfree(saved_ec); |
d66d969d | 1358 | boot_ec = NULL; |
1da177e4 LT |
1359 | return -ENODEV; |
1360 | } | |
1361 | ||
223883b7 AS |
1362 | static struct acpi_driver acpi_ec_driver = { |
1363 | .name = "ec", | |
1364 | .class = ACPI_EC_CLASS, | |
1365 | .ids = ec_device_ids, | |
1366 | .ops = { | |
1367 | .add = acpi_ec_add, | |
1368 | .remove = acpi_ec_remove, | |
223883b7 AS |
1369 | }, |
1370 | }; | |
1371 | ||
a5f820fe | 1372 | int __init acpi_ec_init(void) |
1da177e4 | 1373 | { |
50526df6 | 1374 | int result = 0; |
1da177e4 | 1375 | |
1da177e4 LT |
1376 | /* Now register the driver for the EC */ |
1377 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1378 | if (result < 0) |
d550d98d | 1379 | return -ENODEV; |
1da177e4 | 1380 | |
d550d98d | 1381 | return result; |
1da177e4 LT |
1382 | } |
1383 | ||
1da177e4 LT |
1384 | /* EC driver currently not unloadable */ |
1385 | #if 0 | |
50526df6 | 1386 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1387 | { |
1da177e4 LT |
1388 | |
1389 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1390 | } |
7843932a | 1391 | #endif /* 0 */ |