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 | |
ad479e7f LZ |
139 | /* -------------------------------------------------------------------------- |
140 | * Device Flags | |
141 | * -------------------------------------------------------------------------- */ | |
142 | ||
143 | static bool acpi_ec_started(struct acpi_ec *ec) | |
144 | { | |
145 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
146 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
147 | } | |
148 | ||
9887d22a LZ |
149 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
150 | { | |
151 | return ec->reference_count == 1; | |
152 | } | |
153 | ||
1da177e4 | 154 | /* -------------------------------------------------------------------------- |
ca37bfdf | 155 | * EC Registers |
7a73e60e | 156 | * -------------------------------------------------------------------------- */ |
1da177e4 | 157 | |
6ffb221a | 158 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 159 | { |
3ebe08a7 | 160 | u8 x = inb(ec->command_addr); |
7a73e60e | 161 | |
dd43de20 LZ |
162 | pr_debug("EC_SC(R) = 0x%2.2x " |
163 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
164 | x, | |
165 | !!(x & ACPI_EC_FLAG_SCI), | |
166 | !!(x & ACPI_EC_FLAG_BURST), | |
167 | !!(x & ACPI_EC_FLAG_CMD), | |
168 | !!(x & ACPI_EC_FLAG_IBF), | |
169 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 170 | return x; |
451566f4 DT |
171 | } |
172 | ||
6ffb221a | 173 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 174 | { |
3ebe08a7 | 175 | u8 x = inb(ec->data_addr); |
7a73e60e | 176 | |
9e295ac1 | 177 | ec->curr->timestamp = jiffies; |
dd43de20 | 178 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 179 | return x; |
7c6db5e5 DS |
180 | } |
181 | ||
6ffb221a | 182 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 183 | { |
dd43de20 | 184 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 185 | outb(command, ec->command_addr); |
9e295ac1 | 186 | ec->curr->timestamp = jiffies; |
45bea155 LY |
187 | } |
188 | ||
6ffb221a | 189 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 190 | { |
dd43de20 | 191 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 192 | outb(data, ec->data_addr); |
9e295ac1 | 193 | ec->curr->timestamp = jiffies; |
703959d4 | 194 | } |
45bea155 | 195 | |
e34c0e2b LZ |
196 | #ifdef DEBUG |
197 | static const char *acpi_ec_cmd_string(u8 cmd) | |
198 | { | |
199 | switch (cmd) { | |
200 | case 0x80: | |
201 | return "RD_EC"; | |
202 | case 0x81: | |
203 | return "WR_EC"; | |
204 | case 0x82: | |
205 | return "BE_EC"; | |
206 | case 0x83: | |
207 | return "BD_EC"; | |
208 | case 0x84: | |
209 | return "QR_EC"; | |
210 | } | |
211 | return "UNKNOWN"; | |
212 | } | |
213 | #else | |
214 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
215 | #endif | |
216 | ||
ca37bfdf LZ |
217 | /* -------------------------------------------------------------------------- |
218 | * GPE Registers | |
219 | * -------------------------------------------------------------------------- */ | |
220 | ||
221 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
222 | { | |
223 | acpi_event_status gpe_status = 0; | |
224 | ||
225 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
226 | return (gpe_status & ACPI_EVENT_FLAG_SET) ? true : false; | |
227 | } | |
228 | ||
229 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
230 | { | |
231 | if (open) | |
232 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
233 | else { |
234 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 235 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 236 | } |
ca37bfdf LZ |
237 | if (acpi_ec_is_gpe_raised(ec)) { |
238 | /* | |
239 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
240 | * software need to manually trigger a pseudo GPE event on | |
241 | * EN=1 writes. | |
242 | */ | |
243 | pr_debug("***** Polling quirk *****\n"); | |
244 | advance_transaction(ec); | |
245 | } | |
246 | } | |
247 | ||
248 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
249 | { | |
250 | if (close) | |
251 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
252 | else { |
253 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 254 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 255 | } |
ca37bfdf LZ |
256 | } |
257 | ||
258 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
259 | { | |
260 | /* | |
261 | * GPE STS is a W1C register, which means: | |
262 | * 1. Software can clear it without worrying about clearing other | |
263 | * GPEs' STS bits when the hardware sets them in parallel. | |
264 | * 2. As long as software can ensure only clearing it when it is | |
265 | * set, hardware won't set it in parallel. | |
266 | * So software can clear GPE in any contexts. | |
267 | * Warning: do not move the check into advance_transaction() as the | |
268 | * EC commands will be sent without GPE raised. | |
269 | */ | |
270 | if (!acpi_ec_is_gpe_raised(ec)) | |
271 | return; | |
272 | acpi_clear_gpe(NULL, ec->gpe); | |
273 | } | |
274 | ||
275 | /* -------------------------------------------------------------------------- | |
276 | * Transaction Management | |
277 | * -------------------------------------------------------------------------- */ | |
278 | ||
9887d22a LZ |
279 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
280 | { | |
281 | ec->reference_count++; | |
282 | if (ec->reference_count == 1) | |
283 | acpi_ec_enable_gpe(ec, true); | |
284 | } | |
285 | ||
286 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
287 | { | |
288 | bool flushed = false; | |
289 | ||
290 | ec->reference_count--; | |
291 | if (ec->reference_count == 0) | |
292 | acpi_ec_disable_gpe(ec, true); | |
293 | flushed = acpi_ec_flushed(ec); | |
294 | if (flushed) | |
295 | wake_up(&ec->wait); | |
296 | } | |
297 | ||
e1d4d90f LZ |
298 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
299 | { | |
300 | if (!test_bit(flag, &ec->flags)) { | |
301 | acpi_ec_disable_gpe(ec, false); | |
302 | pr_debug("+++++ Polling enabled +++++\n"); | |
303 | set_bit(flag, &ec->flags); | |
304 | } | |
305 | } | |
306 | ||
307 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
308 | { | |
309 | if (test_bit(flag, &ec->flags)) { | |
310 | clear_bit(flag, &ec->flags); | |
311 | acpi_ec_enable_gpe(ec, false); | |
312 | pr_debug("+++++ Polling disabled +++++\n"); | |
313 | } | |
314 | } | |
315 | ||
9887d22a LZ |
316 | /* |
317 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
318 | * the flush operation is not in | |
319 | * progress | |
320 | * @ec: the EC device | |
321 | * | |
322 | * This function must be used before taking a new action that should hold | |
323 | * the reference count. If this function returns false, then the action | |
324 | * must be discarded or it will prevent the flush operation from being | |
325 | * completed. | |
326 | */ | |
37d11391 | 327 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 328 | { |
37d11391 RW |
329 | if (!acpi_ec_started(ec)) |
330 | return false; | |
9887d22a LZ |
331 | acpi_ec_submit_request(ec); |
332 | return true; | |
333 | } | |
334 | ||
37d11391 | 335 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 336 | { |
37d11391 RW |
337 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
338 | pr_debug("***** Event started *****\n"); | |
74443bbe LZ |
339 | schedule_work(&ec->work); |
340 | } | |
341 | } | |
342 | ||
37d11391 | 343 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe LZ |
344 | { |
345 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
37d11391 RW |
346 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
347 | pr_debug("***** Event stopped *****\n"); | |
74443bbe LZ |
348 | } |
349 | } | |
350 | ||
f92fca00 | 351 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 352 | { |
7c6db4e0 AS |
353 | unsigned long flags; |
354 | int ret = 0; | |
7a73e60e | 355 | |
f351d027 | 356 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 357 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 358 | ret = 1; |
f351d027 | 359 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 360 | return ret; |
45bea155 | 361 | } |
451566f4 | 362 | |
0c78808f | 363 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 364 | { |
36b15875 | 365 | struct transaction *t; |
66b42b78 | 366 | u8 status; |
c0d65341 | 367 | bool wakeup = false; |
b76b51ba | 368 | |
c95f25b0 LZ |
369 | pr_debug("===== %s (%d) =====\n", |
370 | in_interrupt() ? "IRQ" : "TASK", smp_processor_id()); | |
ca37bfdf LZ |
371 | /* |
372 | * By always clearing STS before handling all indications, we can | |
373 | * ensure a hardware STS 0->1 change after this clearing can always | |
374 | * trigger a GPE interrupt. | |
375 | */ | |
376 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 377 | status = acpi_ec_read_status(ec); |
36b15875 | 378 | t = ec->curr; |
b76b51ba | 379 | if (!t) |
f92fca00 LZ |
380 | goto err; |
381 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
382 | if (t->wlen > t->wi) { | |
383 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
384 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
385 | else | |
386 | goto err; | |
387 | } else if (t->rlen > t->ri) { | |
388 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
389 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 390 | if (t->rlen == t->ri) { |
f92fca00 | 391 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 392 | if (t->command == ACPI_EC_COMMAND_QUERY) |
e34c0e2b LZ |
393 | pr_debug("***** Command(%s) hardware completion *****\n", |
394 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
395 | wakeup = true; |
396 | } | |
f92fca00 LZ |
397 | } else |
398 | goto err; | |
399 | } else if (t->wlen == t->wi && | |
c0d65341 | 400 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 401 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
402 | wakeup = true; |
403 | } | |
0c78808f | 404 | goto out; |
f92fca00 | 405 | } else { |
79149001 LZ |
406 | if (EC_FLAGS_QUERY_HANDSHAKE && |
407 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
408 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
409 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 410 | acpi_ec_complete_query(ec); |
3afcf2ec LZ |
411 | t->rdata[t->ri++] = 0x00; |
412 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
e34c0e2b LZ |
413 | pr_debug("***** Command(%s) software completion *****\n", |
414 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
415 | wakeup = true; |
416 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
417 | acpi_ec_write_cmd(ec, t->command); |
418 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 419 | acpi_ec_complete_query(ec); |
7c6db4e0 | 420 | } else |
dd15f8c4 | 421 | goto err; |
0c78808f | 422 | goto out; |
f92fca00 | 423 | } |
dd15f8c4 | 424 | err: |
a3cd8d27 FT |
425 | /* |
426 | * If SCI bit is set, then don't think it's a false IRQ | |
427 | * otherwise will take a not handled IRQ as a false one. | |
428 | */ | |
f92fca00 | 429 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
430 | if (in_interrupt() && t) { |
431 | if (t->irq_count < ec_storm_threshold) | |
432 | ++t->irq_count; | |
433 | /* Allow triggering on 0 threshold */ | |
434 | if (t->irq_count == ec_storm_threshold) | |
435 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
436 | } | |
f92fca00 | 437 | } |
0c78808f | 438 | out: |
74443bbe | 439 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 440 | acpi_ec_submit_query(ec); |
0c78808f LZ |
441 | if (wakeup && in_interrupt()) |
442 | wake_up(&ec->wait); | |
f92fca00 | 443 | } |
a3cd8d27 | 444 | |
f92fca00 LZ |
445 | static void start_transaction(struct acpi_ec *ec) |
446 | { | |
447 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
448 | ec->curr->flags = 0; | |
9e295ac1 | 449 | ec->curr->timestamp = jiffies; |
0c78808f | 450 | advance_transaction(ec); |
845625cd | 451 | } |
03d1d99c | 452 | |
7c6db4e0 AS |
453 | static int ec_poll(struct acpi_ec *ec) |
454 | { | |
2a84cb98 | 455 | unsigned long flags; |
28fe5c82 | 456 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 457 | |
2a84cb98 AS |
458 | while (repeat--) { |
459 | unsigned long delay = jiffies + | |
7a18e96d | 460 | msecs_to_jiffies(ec_delay); |
9e295ac1 | 461 | unsigned long usecs = ACPI_EC_UDELAY_POLL; |
2a84cb98 AS |
462 | do { |
463 | /* don't sleep with disabled interrupts */ | |
464 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
9e295ac1 LZ |
465 | usecs = ACPI_EC_MSI_UDELAY; |
466 | udelay(usecs); | |
f92fca00 | 467 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
468 | return 0; |
469 | } else { | |
470 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 471 | ec_transaction_completed(ec), |
9e295ac1 | 472 | usecs_to_jiffies(usecs))) |
2a84cb98 AS |
473 | return 0; |
474 | } | |
f92fca00 | 475 | spin_lock_irqsave(&ec->lock, flags); |
9e295ac1 LZ |
476 | if (time_after(jiffies, |
477 | ec->curr->timestamp + | |
478 | usecs_to_jiffies(usecs))) | |
479 | advance_transaction(ec); | |
f92fca00 | 480 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 481 | } while (time_before(jiffies, delay)); |
16a26e85 | 482 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 483 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 484 | start_transaction(ec); |
f351d027 | 485 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 486 | } |
b77d81b2 | 487 | return -ETIME; |
1da177e4 LT |
488 | } |
489 | ||
8463200a | 490 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 491 | struct transaction *t) |
45bea155 | 492 | { |
7c6db4e0 | 493 | unsigned long tmp; |
7c6db4e0 | 494 | int ret = 0; |
7a73e60e | 495 | |
5423a0cb | 496 | if (EC_FLAGS_MSI) |
2a84cb98 | 497 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 498 | /* start transaction */ |
f351d027 | 499 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 500 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 501 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
502 | ret = -EINVAL; |
503 | goto unlock; | |
504 | } | |
7c6db4e0 | 505 | /* following two actions should be kept atomic */ |
8463200a | 506 | ec->curr = t; |
e34c0e2b LZ |
507 | pr_debug("***** Command(%s) started *****\n", |
508 | acpi_ec_cmd_string(t->command)); | |
a2f93aea | 509 | start_transaction(ec); |
df9ff918 LZ |
510 | spin_unlock_irqrestore(&ec->lock, tmp); |
511 | ret = ec_poll(ec); | |
512 | spin_lock_irqsave(&ec->lock, tmp); | |
e1d4d90f LZ |
513 | if (t->irq_count == ec_storm_threshold) |
514 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
e34c0e2b LZ |
515 | pr_debug("***** Command(%s) stopped *****\n", |
516 | acpi_ec_cmd_string(t->command)); | |
8463200a | 517 | ec->curr = NULL; |
9887d22a LZ |
518 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
519 | acpi_ec_complete_request(ec); | |
ad479e7f | 520 | unlock: |
f351d027 | 521 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
522 | return ret; |
523 | } | |
524 | ||
2a84cb98 | 525 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 526 | { |
d7a76e4c | 527 | int status; |
50526df6 | 528 | u32 glk; |
7a73e60e | 529 | |
8463200a | 530 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 531 | return -EINVAL; |
8463200a AS |
532 | if (t->rdata) |
533 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 534 | mutex_lock(&ec->mutex); |
703959d4 | 535 | if (ec->global_lock) { |
1da177e4 | 536 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 537 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
538 | status = -ENODEV; |
539 | goto unlock; | |
c24e912b | 540 | } |
1da177e4 | 541 | } |
a62e8f19 | 542 | |
2a84cb98 | 543 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 544 | |
e1d4d90f | 545 | if (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags)) |
54070101 | 546 | msleep(1); |
703959d4 | 547 | if (ec->global_lock) |
1da177e4 | 548 | acpi_release_global_lock(glk); |
7c6db4e0 | 549 | unlock: |
f351d027 | 550 | mutex_unlock(&ec->mutex); |
d550d98d | 551 | return status; |
1da177e4 LT |
552 | } |
553 | ||
8a383ef0 | 554 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
555 | { |
556 | u8 d; | |
8463200a AS |
557 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
558 | .wdata = NULL, .rdata = &d, | |
559 | .wlen = 0, .rlen = 1}; | |
560 | ||
2a84cb98 | 561 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
562 | } |
563 | ||
8a383ef0 | 564 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 565 | { |
8463200a AS |
566 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
567 | .wdata = NULL, .rdata = NULL, | |
568 | .wlen = 0, .rlen = 0}; | |
569 | ||
7c6db4e0 | 570 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 571 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
572 | } |
573 | ||
7a73e60e | 574 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
575 | { |
576 | int result; | |
577 | u8 d; | |
8463200a AS |
578 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
579 | .wdata = &address, .rdata = &d, | |
580 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 581 | |
2a84cb98 | 582 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
583 | *data = d; |
584 | return result; | |
585 | } | |
6ffb221a | 586 | |
3576cf61 DS |
587 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
588 | { | |
6ccedb10 | 589 | u8 wdata[2] = { address, data }; |
8463200a AS |
590 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
591 | .wdata = wdata, .rdata = NULL, | |
592 | .wlen = 2, .rlen = 0}; | |
593 | ||
2a84cb98 | 594 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
595 | } |
596 | ||
b76b51ba | 597 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 598 | { |
1da177e4 | 599 | int err; |
6ffb221a | 600 | u8 temp_data; |
1da177e4 LT |
601 | |
602 | if (!first_ec) | |
603 | return -ENODEV; | |
604 | ||
d033879c | 605 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
606 | |
607 | if (!err) { | |
608 | *val = temp_data; | |
609 | return 0; | |
7a73e60e LZ |
610 | } |
611 | return err; | |
1da177e4 LT |
612 | } |
613 | EXPORT_SYMBOL(ec_read); | |
614 | ||
50526df6 | 615 | int ec_write(u8 addr, u8 val) |
1da177e4 | 616 | { |
1da177e4 LT |
617 | int err; |
618 | ||
619 | if (!first_ec) | |
620 | return -ENODEV; | |
621 | ||
d033879c | 622 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
623 | |
624 | return err; | |
625 | } | |
626 | EXPORT_SYMBOL(ec_write); | |
627 | ||
616362de | 628 | int ec_transaction(u8 command, |
7a73e60e LZ |
629 | const u8 *wdata, unsigned wdata_len, |
630 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 631 | { |
8463200a AS |
632 | struct transaction t = {.command = command, |
633 | .wdata = wdata, .rdata = rdata, | |
634 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 635 | |
d7a76e4c LP |
636 | if (!first_ec) |
637 | return -ENODEV; | |
45bea155 | 638 | |
2a84cb98 | 639 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 640 | } |
ab9e43c6 LP |
641 | EXPORT_SYMBOL(ec_transaction); |
642 | ||
3e2abc5a SF |
643 | /* Get the handle to the EC device */ |
644 | acpi_handle ec_get_handle(void) | |
645 | { | |
646 | if (!first_ec) | |
647 | return NULL; | |
648 | return first_ec->handle; | |
649 | } | |
3e2abc5a SF |
650 | EXPORT_SYMBOL(ec_get_handle); |
651 | ||
ad332c8a | 652 | /* |
3eba563e | 653 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
654 | * Run with locked ec mutex. |
655 | */ | |
656 | static void acpi_ec_clear(struct acpi_ec *ec) | |
657 | { | |
658 | int i, status; | |
659 | u8 value = 0; | |
660 | ||
661 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 662 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
663 | if (status || !value) |
664 | break; | |
665 | } | |
666 | ||
667 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
668 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
669 | else | |
670 | pr_info("%d stale EC events cleared\n", i); | |
671 | } | |
672 | ||
ad479e7f LZ |
673 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
674 | { | |
675 | unsigned long flags; | |
676 | ||
677 | spin_lock_irqsave(&ec->lock, flags); | |
678 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
679 | pr_debug("+++++ Starting EC +++++\n"); | |
9887d22a | 680 | /* Enable GPE for event processing (SCI_EVT=1) */ |
e06bf91b | 681 | if (!resuming) |
9887d22a | 682 | acpi_ec_submit_request(ec); |
92e4b1bc | 683 | pr_debug("EC started\n"); |
ad479e7f LZ |
684 | } |
685 | spin_unlock_irqrestore(&ec->lock, flags); | |
686 | } | |
687 | ||
9887d22a LZ |
688 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
689 | { | |
690 | unsigned long flags; | |
691 | bool flushed; | |
692 | ||
693 | spin_lock_irqsave(&ec->lock, flags); | |
694 | flushed = acpi_ec_flushed(ec); | |
695 | spin_unlock_irqrestore(&ec->lock, flags); | |
696 | return flushed; | |
697 | } | |
698 | ||
ad479e7f LZ |
699 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
700 | { | |
701 | unsigned long flags; | |
702 | ||
703 | spin_lock_irqsave(&ec->lock, flags); | |
704 | if (acpi_ec_started(ec)) { | |
705 | pr_debug("+++++ Stopping EC +++++\n"); | |
706 | set_bit(EC_FLAGS_STOPPED, &ec->flags); | |
9887d22a LZ |
707 | spin_unlock_irqrestore(&ec->lock, flags); |
708 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
709 | spin_lock_irqsave(&ec->lock, flags); | |
710 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
e06bf91b | 711 | if (!suspending) |
9887d22a | 712 | acpi_ec_complete_request(ec); |
ad479e7f LZ |
713 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
714 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
92e4b1bc | 715 | pr_debug("EC stopped\n"); |
ad479e7f LZ |
716 | } |
717 | spin_unlock_irqrestore(&ec->lock, flags); | |
718 | } | |
719 | ||
fe955682 | 720 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
721 | { |
722 | struct acpi_ec *ec = first_ec; | |
723 | ||
724 | if (!ec) | |
725 | return; | |
726 | ||
f351d027 | 727 | mutex_lock(&ec->mutex); |
f6bb13aa | 728 | /* Prevent transactions from being carried out */ |
ad479e7f | 729 | acpi_ec_stop(ec, true); |
f351d027 | 730 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
731 | } |
732 | ||
fe955682 | 733 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
734 | { |
735 | struct acpi_ec *ec = first_ec; | |
736 | ||
737 | if (!ec) | |
738 | return; | |
739 | ||
f6bb13aa | 740 | /* Allow transactions to be carried out again */ |
ad479e7f | 741 | acpi_ec_start(ec, true); |
ad332c8a KC |
742 | |
743 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
744 | acpi_ec_clear(ec); | |
f6bb13aa RW |
745 | } |
746 | ||
fe955682 | 747 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
748 | { |
749 | /* | |
750 | * Allow transactions to happen again (this function is called from | |
751 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
752 | */ | |
753 | if (first_ec) | |
ad479e7f | 754 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
755 | } |
756 | ||
1da177e4 LT |
757 | /* -------------------------------------------------------------------------- |
758 | Event Management | |
759 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
760 | static struct acpi_ec_query_handler * |
761 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
762 | { | |
763 | if (handler) | |
764 | kref_get(&handler->kref); | |
765 | return handler; | |
766 | } | |
767 | ||
768 | static void acpi_ec_query_handler_release(struct kref *kref) | |
769 | { | |
770 | struct acpi_ec_query_handler *handler = | |
771 | container_of(kref, struct acpi_ec_query_handler, kref); | |
772 | ||
773 | kfree(handler); | |
774 | } | |
775 | ||
776 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
777 | { | |
778 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
779 | } | |
780 | ||
837012ed AS |
781 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
782 | acpi_handle handle, acpi_ec_query_func func, | |
783 | void *data) | |
784 | { | |
785 | struct acpi_ec_query_handler *handler = | |
786 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 787 | |
837012ed AS |
788 | if (!handler) |
789 | return -ENOMEM; | |
790 | ||
791 | handler->query_bit = query_bit; | |
792 | handler->handle = handle; | |
793 | handler->func = func; | |
794 | handler->data = data; | |
f351d027 | 795 | mutex_lock(&ec->mutex); |
01305d41 | 796 | kref_init(&handler->kref); |
30c08574 | 797 | list_add(&handler->node, &ec->list); |
f351d027 | 798 | mutex_unlock(&ec->mutex); |
837012ed AS |
799 | return 0; |
800 | } | |
837012ed AS |
801 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
802 | ||
803 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
804 | { | |
1544fdbc | 805 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 806 | LIST_HEAD(free_list); |
7a73e60e | 807 | |
f351d027 | 808 | mutex_lock(&ec->mutex); |
1544fdbc | 809 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 810 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
811 | list_del_init(&handler->node); |
812 | list_add(&handler->node, &free_list); | |
837012ed AS |
813 | } |
814 | } | |
f351d027 | 815 | mutex_unlock(&ec->mutex); |
01305d41 LZ |
816 | list_for_each_entry(handler, &free_list, node) |
817 | acpi_ec_put_query_handler(handler); | |
837012ed | 818 | } |
837012ed | 819 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 820 | |
a62e8f19 | 821 | static void acpi_ec_run(void *cxt) |
45bea155 | 822 | { |
a62e8f19 | 823 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 824 | |
a62e8f19 | 825 | if (!handler) |
e41334c0 | 826 | return; |
d3090b6a | 827 | pr_debug("##### Query(0x%02x) started #####\n", handler->query_bit); |
a62e8f19 AS |
828 | if (handler->func) |
829 | handler->func(handler->data); | |
830 | else if (handler->handle) | |
831 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
d3090b6a | 832 | pr_debug("##### Query(0x%02x) stopped #####\n", handler->query_bit); |
01305d41 | 833 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
834 | } |
835 | ||
550b3aac | 836 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
837 | { |
838 | u8 value = 0; | |
c2cf5769 LZ |
839 | int result; |
840 | acpi_status status; | |
01305d41 | 841 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
842 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
843 | .wdata = NULL, .rdata = &value, | |
844 | .wlen = 0, .rlen = 1}; | |
3eba563e | 845 | |
550b3aac LZ |
846 | /* |
847 | * Query the EC to find out which _Qxx method we need to evaluate. | |
848 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
849 | * bit to be cleared (and thus clearing the interrupt source). | |
850 | */ | |
851 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
852 | if (result) |
853 | return result; | |
550b3aac LZ |
854 | if (data) |
855 | *data = value; | |
856 | if (!value) | |
857 | return -ENODATA; | |
3eba563e | 858 | |
550b3aac | 859 | mutex_lock(&ec->mutex); |
837012ed AS |
860 | list_for_each_entry(handler, &ec->list, node) { |
861 | if (value == handler->query_bit) { | |
862 | /* have custom handler for this bit */ | |
01305d41 | 863 | handler = acpi_ec_get_query_handler(handler); |
d3090b6a LZ |
864 | pr_debug("##### Query(0x%02x) scheduled #####\n", |
865 | handler->query_bit); | |
c2cf5769 | 866 | status = acpi_os_execute((handler->func) ? |
f5347867 | 867 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 868 | acpi_ec_run, handler); |
c2cf5769 LZ |
869 | if (ACPI_FAILURE(status)) |
870 | result = -EBUSY; | |
871 | break; | |
837012ed AS |
872 | } |
873 | } | |
550b3aac | 874 | mutex_unlock(&ec->mutex); |
c2cf5769 | 875 | return result; |
a62e8f19 AS |
876 | } |
877 | ||
74443bbe | 878 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 879 | { |
74443bbe | 880 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 881 | |
550b3aac | 882 | acpi_ec_query(ec, NULL); |
45bea155 | 883 | } |
1da177e4 | 884 | |
8b6cd8ad LM |
885 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
886 | u32 gpe_number, void *data) | |
1da177e4 | 887 | { |
f92fca00 | 888 | unsigned long flags; |
3d02b90b | 889 | struct acpi_ec *ec = data; |
7c6db4e0 | 890 | |
f92fca00 | 891 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 892 | advance_transaction(ec); |
c0d65341 | 893 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 894 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
895 | } |
896 | ||
1da177e4 | 897 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
898 | * Address Space Management |
899 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 900 | |
1da177e4 | 901 | static acpi_status |
5b7734b4 | 902 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 903 | u32 bits, u64 *value64, |
50526df6 | 904 | void *handler_context, void *region_context) |
1da177e4 | 905 | { |
3d02b90b | 906 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
907 | int result = 0, i, bytes = bits / 8; |
908 | u8 *value = (u8 *)value64; | |
1da177e4 | 909 | |
1da177e4 | 910 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 911 | return AE_BAD_PARAMETER; |
1da177e4 | 912 | |
5b7734b4 | 913 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 914 | return AE_BAD_PARAMETER; |
1da177e4 | 915 | |
dadf28a1 | 916 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 917 | acpi_ec_burst_enable(ec); |
b3b233c7 | 918 | |
dadf28a1 AS |
919 | for (i = 0; i < bytes; ++i, ++address, ++value) |
920 | result = (function == ACPI_READ) ? | |
921 | acpi_ec_read(ec, address, value) : | |
922 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 923 | |
dadf28a1 | 924 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 925 | acpi_ec_burst_disable(ec); |
b3b233c7 | 926 | |
1da177e4 LT |
927 | switch (result) { |
928 | case -EINVAL: | |
d550d98d | 929 | return AE_BAD_PARAMETER; |
1da177e4 | 930 | case -ENODEV: |
d550d98d | 931 | return AE_NOT_FOUND; |
1da177e4 | 932 | case -ETIME: |
d550d98d | 933 | return AE_TIME; |
1da177e4 | 934 | default: |
d550d98d | 935 | return AE_OK; |
1da177e4 | 936 | } |
1da177e4 LT |
937 | } |
938 | ||
1da177e4 | 939 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
940 | * Driver Interface |
941 | * -------------------------------------------------------------------------- */ | |
942 | ||
c0900c35 AS |
943 | static acpi_status |
944 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
945 | ||
c0900c35 AS |
946 | static struct acpi_ec *make_acpi_ec(void) |
947 | { | |
948 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 949 | |
c0900c35 AS |
950 | if (!ec) |
951 | return NULL; | |
37d11391 | 952 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 953 | mutex_init(&ec->mutex); |
c0900c35 | 954 | init_waitqueue_head(&ec->wait); |
837012ed | 955 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 956 | spin_lock_init(&ec->lock); |
74443bbe | 957 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
c0900c35 AS |
958 | return ec; |
959 | } | |
837012ed | 960 | |
c019b193 AS |
961 | static acpi_status |
962 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
963 | void *context, void **return_value) | |
964 | { | |
0175d562 LM |
965 | char node_name[5]; |
966 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
967 | struct acpi_ec *ec = context; |
968 | int value = 0; | |
0175d562 LM |
969 | acpi_status status; |
970 | ||
971 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
972 | ||
7a73e60e | 973 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 974 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
975 | return AE_OK; |
976 | } | |
977 | ||
cd8c93a4 AS |
978 | static acpi_status |
979 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 980 | { |
cd8c93a4 | 981 | acpi_status status; |
d21cf3c1 | 982 | unsigned long long tmp = 0; |
cd8c93a4 | 983 | struct acpi_ec *ec = context; |
a5032bfd AS |
984 | |
985 | /* clear addr values, ec_parse_io_ports depend on it */ | |
986 | ec->command_addr = ec->data_addr = 0; | |
987 | ||
cd8c93a4 AS |
988 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
989 | ec_parse_io_ports, ec); | |
990 | if (ACPI_FAILURE(status)) | |
991 | return status; | |
837012ed AS |
992 | |
993 | /* Get GPE bit assignment (EC events). */ | |
994 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 995 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
996 | if (ACPI_FAILURE(status)) |
997 | return status; | |
27663c58 | 998 | ec->gpe = tmp; |
837012ed | 999 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1000 | tmp = 0; |
27663c58 MW |
1001 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1002 | ec->global_lock = tmp; | |
837012ed | 1003 | ec->handle = handle; |
cd8c93a4 | 1004 | return AE_CTRL_TERMINATE; |
837012ed AS |
1005 | } |
1006 | ||
5efc5476 BH |
1007 | static int ec_install_handlers(struct acpi_ec *ec) |
1008 | { | |
1009 | acpi_status status; | |
7a73e60e | 1010 | |
5efc5476 BH |
1011 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1012 | return 0; | |
ca37bfdf | 1013 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1014 | ACPI_GPE_EDGE_TRIGGERED, |
1015 | &acpi_ec_gpe_handler, ec); | |
1016 | if (ACPI_FAILURE(status)) | |
1017 | return -ENODEV; | |
9630bdd9 | 1018 | |
ad479e7f | 1019 | acpi_ec_start(ec, false); |
5efc5476 BH |
1020 | status = acpi_install_address_space_handler(ec->handle, |
1021 | ACPI_ADR_SPACE_EC, | |
1022 | &acpi_ec_space_handler, | |
1023 | NULL, ec); | |
1024 | if (ACPI_FAILURE(status)) { | |
1025 | if (status == AE_NOT_FOUND) { | |
1026 | /* | |
1027 | * Maybe OS fails in evaluating the _REG object. | |
1028 | * The AE_NOT_FOUND error will be ignored and OS | |
1029 | * continue to initialize EC. | |
1030 | */ | |
16a26e85 | 1031 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1032 | " of EC device. Broken bios is suspected.\n"); |
1033 | } else { | |
ad479e7f | 1034 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1035 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1036 | &acpi_ec_gpe_handler); | |
1037 | return -ENODEV; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
4c611060 AS |
1045 | static void ec_remove_handlers(struct acpi_ec *ec) |
1046 | { | |
1741acea LZ |
1047 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1048 | return; | |
ad479e7f | 1049 | acpi_ec_stop(ec, false); |
4c611060 AS |
1050 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1051 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1052 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1053 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1054 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1055 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1056 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1057 | } |
1058 | ||
703959d4 | 1059 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1060 | { |
703959d4 | 1061 | struct acpi_ec *ec = NULL; |
d02be047 | 1062 | int ret; |
45bea155 | 1063 | |
c0900c35 AS |
1064 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1065 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1066 | ||
4c611060 | 1067 | /* Check for boot EC */ |
ce52ddf5 AS |
1068 | if (boot_ec && |
1069 | (boot_ec->handle == device->handle || | |
1070 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1071 | ec = boot_ec; | |
1072 | boot_ec = NULL; | |
1073 | } else { | |
1074 | ec = make_acpi_ec(); | |
1075 | if (!ec) | |
1076 | return -ENOMEM; | |
a5032bfd AS |
1077 | } |
1078 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1079 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1080 | kfree(ec); |
1081 | return -EINVAL; | |
4c611060 AS |
1082 | } |
1083 | ||
ce52ddf5 AS |
1084 | /* Find and register all query methods */ |
1085 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1086 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1087 | |
4c611060 AS |
1088 | if (!first_ec) |
1089 | first_ec = ec; | |
db89b4f0 | 1090 | device->driver_data = ec; |
de4f1046 | 1091 | |
d6795fe3 AK |
1092 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1093 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1094 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1095 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1096 | |
16a26e85 | 1097 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1098 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1099 | |
1100 | ret = ec_install_handlers(ec); | |
1101 | ||
1102 | /* EC is fully operational, allow queries */ | |
37d11391 | 1103 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1104 | |
1105 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1106 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1107 | acpi_ec_clear(ec); |
5efc5476 | 1108 | return ret; |
1da177e4 LT |
1109 | } |
1110 | ||
51fac838 | 1111 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1112 | { |
01f22462 | 1113 | struct acpi_ec *ec; |
07ddf768 | 1114 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1115 | |
1da177e4 | 1116 | if (!device) |
d550d98d | 1117 | return -EINVAL; |
1da177e4 LT |
1118 | |
1119 | ec = acpi_driver_data(device); | |
cf745ec7 | 1120 | ec_remove_handlers(ec); |
f351d027 | 1121 | mutex_lock(&ec->mutex); |
07ddf768 | 1122 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1123 | list_del(&handler->node); |
1124 | kfree(handler); | |
1125 | } | |
f351d027 | 1126 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1127 | release_region(ec->data_addr, 1); |
1128 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1129 | device->driver_data = NULL; |
d033879c | 1130 | if (ec == first_ec) |
c0900c35 | 1131 | first_ec = NULL; |
4c611060 | 1132 | kfree(ec); |
d550d98d | 1133 | return 0; |
1da177e4 LT |
1134 | } |
1135 | ||
1da177e4 | 1136 | static acpi_status |
c0900c35 | 1137 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1138 | { |
3d02b90b | 1139 | struct acpi_ec *ec = context; |
1da177e4 | 1140 | |
01f22462 | 1141 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1142 | return AE_OK; |
1da177e4 LT |
1143 | |
1144 | /* | |
1145 | * The first address region returned is the data port, and | |
1146 | * the second address region returned is the status/command | |
1147 | * port. | |
1148 | */ | |
de4f1046 | 1149 | if (ec->data_addr == 0) |
6ffb221a | 1150 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1151 | else if (ec->command_addr == 0) |
6ffb221a | 1152 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1153 | else |
1da177e4 | 1154 | return AE_CTRL_TERMINATE; |
1da177e4 | 1155 | |
1da177e4 LT |
1156 | return AE_OK; |
1157 | } | |
1158 | ||
c04209a7 AS |
1159 | int __init acpi_boot_ec_enable(void) |
1160 | { | |
7c6db4e0 | 1161 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1162 | return 0; |
1163 | if (!ec_install_handlers(boot_ec)) { | |
1164 | first_ec = boot_ec; | |
1165 | return 0; | |
1166 | } | |
1167 | return -EFAULT; | |
1168 | } | |
1169 | ||
223883b7 AS |
1170 | static const struct acpi_device_id ec_device_ids[] = { |
1171 | {"PNP0C09", 0}, | |
1172 | {"", 0}, | |
1173 | }; | |
1174 | ||
478fa03b AS |
1175 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1176 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1177 | { | |
1178 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1179 | return 0; | |
1180 | } | |
1181 | ||
0adf3c74 AS |
1182 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1183 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1184 | { | |
1185 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | /* MSI EC needs special treatment, enable it */ | |
1190 | static int ec_flag_msi(const struct dmi_system_id *id) | |
1191 | { | |
16a26e85 | 1192 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
1193 | EC_FLAGS_MSI = 1; |
1194 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1195 | return 0; | |
1196 | } | |
1197 | ||
67bfa9b6 FT |
1198 | /* |
1199 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
1200 | * the GPE storm threshold back to 20 | |
1201 | */ | |
1202 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
1203 | { | |
1204 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
1205 | ec_storm_threshold = 20; | |
1206 | return 0; | |
1207 | } | |
1208 | ||
79149001 LZ |
1209 | /* |
1210 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1211 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1212 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1213 | */ | |
1214 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1215 | { | |
1216 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1217 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1218 | return 0; | |
1219 | } | |
1220 | ||
ad332c8a KC |
1221 | /* |
1222 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1223 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1224 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1225 | * | |
1226 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1227 | * | |
1228 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1229 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1230 | * behaviour is not known at this time. | |
1231 | * | |
1232 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1233 | * however it is very likely that other Samsung models are affected. | |
1234 | * | |
1235 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1236 | * should be harmless. | |
1237 | */ | |
1238 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1239 | { | |
1240 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1241 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1242 | return 0; | |
1243 | } | |
1244 | ||
6cef7497 | 1245 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1246 | { |
1247 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1248 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1249 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1250 | { |
1251 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1252 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1253 | { | |
1254 | ec_flag_msi, "MSI hardware", { | |
1255 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1256 | { | |
1257 | ec_flag_msi, "MSI hardware", { | |
1258 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1259 | { |
a5dc4f89 AS |
1260 | ec_flag_msi, "MSI hardware", { |
1261 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1262 | { | |
534bc4e3 ZR |
1263 | ec_flag_msi, "Quanta hardware", { |
1264 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1265 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1266 | { | |
1267 | ec_flag_msi, "Quanta hardware", { | |
1268 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1269 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1270 | { | |
777cb382 LT |
1271 | ec_flag_msi, "Clevo W350etq", { |
1272 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1273 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1274 | { | |
0adf3c74 AS |
1275 | ec_validate_ecdt, "ASUS hardware", { |
1276 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1277 | { |
1278 | ec_validate_ecdt, "ASUS hardware", { | |
1279 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1280 | { |
1281 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1282 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1283 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1284 | { |
1285 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1286 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1287 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1288 | { |
1289 | ec_validate_ecdt, "ASUS hardware", { | |
1290 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1291 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1292 | { |
1293 | ec_clear_on_resume, "Samsung hardware", { | |
1294 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1295 | { |
1296 | ec_flag_query_handshake, "Acer hardware", { | |
1297 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1298 | {}, |
1299 | }; | |
1300 | ||
c0900c35 AS |
1301 | int __init acpi_ec_ecdt_probe(void) |
1302 | { | |
c0900c35 | 1303 | acpi_status status; |
c6cb0e87 | 1304 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1305 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1306 | |
d66d969d AS |
1307 | boot_ec = make_acpi_ec(); |
1308 | if (!boot_ec) | |
c0900c35 AS |
1309 | return -ENOMEM; |
1310 | /* | |
1311 | * Generate a boot ec context | |
1312 | */ | |
0adf3c74 | 1313 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1314 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1315 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1316 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1317 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1318 | boot_ec->command_addr = ecdt_ptr->control.address; |
1319 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1320 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1321 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1322 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1323 | &boot_ec->handle); | |
c6cb0e87 | 1324 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1325 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1326 | goto install; |
d6bd535d | 1327 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1328 | if (!saved_ec) |
1329 | return -ENOMEM; | |
c5279dee | 1330 | /* fall through */ |
cd8c93a4 | 1331 | } |
0adf3c74 | 1332 | |
ed4b197d CIK |
1333 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1334 | kfree(saved_ec); | |
478fa03b | 1335 | return -ENODEV; |
ed4b197d | 1336 | } |
478fa03b | 1337 | |
c5279dee AS |
1338 | /* This workaround is needed only on some broken machines, |
1339 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1340 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1341 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1342 | boot_ec, NULL); | |
1343 | /* Check that acpi_get_devices actually find something */ | |
1344 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1345 | goto error; | |
c6cb0e87 AS |
1346 | if (saved_ec) { |
1347 | /* try to find good ECDT from ASUSTek */ | |
1348 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1349 | saved_ec->data_addr != boot_ec->data_addr || | |
1350 | saved_ec->gpe != boot_ec->gpe || | |
1351 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1352 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1353 | "ECDT tables, which are very hard to workaround. " |
1354 | "Trying to use DSDT EC info instead. Please send " | |
1355 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1356 | kfree(saved_ec); | |
1357 | saved_ec = NULL; | |
1358 | } else { | |
1359 | /* We really need to limit this workaround, the only ASUS, | |
1360 | * which needs it, has fake EC._INI method, so use it as flag. | |
1361 | * Keep boot_ec struct as it will be needed soon. | |
1362 | */ | |
c6cb0e87 | 1363 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1364 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1365 | return -ENODEV; |
1366 | } | |
c5279dee AS |
1367 | install: |
1368 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1369 | first_ec = boot_ec; |
e8284321 | 1370 | return 0; |
d033879c | 1371 | } |
c5279dee | 1372 | error: |
d66d969d | 1373 | kfree(boot_ec); |
ed4b197d | 1374 | kfree(saved_ec); |
d66d969d | 1375 | boot_ec = NULL; |
1da177e4 LT |
1376 | return -ENODEV; |
1377 | } | |
1378 | ||
223883b7 AS |
1379 | static struct acpi_driver acpi_ec_driver = { |
1380 | .name = "ec", | |
1381 | .class = ACPI_EC_CLASS, | |
1382 | .ids = ec_device_ids, | |
1383 | .ops = { | |
1384 | .add = acpi_ec_add, | |
1385 | .remove = acpi_ec_remove, | |
223883b7 AS |
1386 | }, |
1387 | }; | |
1388 | ||
a5f820fe | 1389 | int __init acpi_ec_init(void) |
1da177e4 | 1390 | { |
50526df6 | 1391 | int result = 0; |
1da177e4 | 1392 | |
1da177e4 LT |
1393 | /* Now register the driver for the EC */ |
1394 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1395 | if (result < 0) |
d550d98d | 1396 | return -ENODEV; |
1da177e4 | 1397 | |
d550d98d | 1398 | return result; |
1da177e4 LT |
1399 | } |
1400 | ||
1da177e4 LT |
1401 | /* EC driver currently not unloadable */ |
1402 | #if 0 | |
50526df6 | 1403 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1404 | { |
1da177e4 LT |
1405 | |
1406 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1407 | } |
7843932a | 1408 | #endif /* 0 */ |