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 { |
f252cb09 LZ |
79 | EC_FLAGS_EVENT_ENABLED, /* Event is enabled */ |
80 | EC_FLAGS_EVENT_PENDING, /* Event is pending */ | |
81 | EC_FLAGS_EVENT_DETECTED, /* Event is detected */ | |
f6bb13aa | 82 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 83 | * OpReg are installed */ |
ad479e7f LZ |
84 | EC_FLAGS_STARTED, /* Driver is started */ |
85 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
86 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
87 | * current command processing */ | |
1da177e4 | 88 | }; |
6ffb221a | 89 | |
f92fca00 LZ |
90 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
91 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
92 | ||
7a18e96d TR |
93 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
94 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
95 | module_param(ec_delay, uint, 0644); | |
96 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
97 | ||
a520d52e FT |
98 | /* |
99 | * If the number of false interrupts per one transaction exceeds | |
100 | * this threshold, will think there is a GPE storm happened and | |
101 | * will disable the GPE for normal transaction. | |
102 | */ | |
103 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
104 | module_param(ec_storm_threshold, uint, 0644); | |
105 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
106 | ||
837012ed AS |
107 | struct acpi_ec_query_handler { |
108 | struct list_head node; | |
109 | acpi_ec_query_func func; | |
110 | acpi_handle handle; | |
111 | void *data; | |
112 | u8 query_bit; | |
01305d41 | 113 | struct kref kref; |
837012ed AS |
114 | }; |
115 | ||
8463200a | 116 | struct transaction { |
7c6db4e0 AS |
117 | const u8 *wdata; |
118 | u8 *rdata; | |
119 | unsigned short irq_count; | |
8463200a | 120 | u8 command; |
a2f93aea AS |
121 | u8 wi; |
122 | u8 ri; | |
7c6db4e0 AS |
123 | u8 wlen; |
124 | u8 rlen; | |
f92fca00 | 125 | u8 flags; |
9e295ac1 | 126 | unsigned long timestamp; |
7c6db4e0 AS |
127 | }; |
128 | ||
550b3aac | 129 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 130 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 131 | |
1195a098 TR |
132 | struct acpi_ec *boot_ec, *first_ec; |
133 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 134 | |
5423a0cb | 135 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 136 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 137 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 138 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 139 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 140 | |
ad479e7f LZ |
141 | /* -------------------------------------------------------------------------- |
142 | * Device Flags | |
143 | * -------------------------------------------------------------------------- */ | |
144 | ||
145 | static bool acpi_ec_started(struct acpi_ec *ec) | |
146 | { | |
147 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
148 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
149 | } | |
150 | ||
9887d22a LZ |
151 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
152 | { | |
153 | return ec->reference_count == 1; | |
154 | } | |
155 | ||
f252cb09 LZ |
156 | static bool acpi_ec_has_pending_event(struct acpi_ec *ec) |
157 | { | |
158 | return test_bit(EC_FLAGS_EVENT_DETECTED, &ec->flags) || | |
159 | test_bit(EC_FLAGS_EVENT_PENDING, &ec->flags); | |
160 | } | |
161 | ||
1da177e4 | 162 | /* -------------------------------------------------------------------------- |
ca37bfdf | 163 | * EC Registers |
7a73e60e | 164 | * -------------------------------------------------------------------------- */ |
1da177e4 | 165 | |
6ffb221a | 166 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 167 | { |
3ebe08a7 | 168 | u8 x = inb(ec->command_addr); |
7a73e60e | 169 | |
dd43de20 LZ |
170 | pr_debug("EC_SC(R) = 0x%2.2x " |
171 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
172 | x, | |
173 | !!(x & ACPI_EC_FLAG_SCI), | |
174 | !!(x & ACPI_EC_FLAG_BURST), | |
175 | !!(x & ACPI_EC_FLAG_CMD), | |
176 | !!(x & ACPI_EC_FLAG_IBF), | |
177 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 178 | return x; |
451566f4 DT |
179 | } |
180 | ||
6ffb221a | 181 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 182 | { |
3ebe08a7 | 183 | u8 x = inb(ec->data_addr); |
7a73e60e | 184 | |
9e295ac1 | 185 | ec->curr->timestamp = jiffies; |
dd43de20 | 186 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 187 | return x; |
7c6db5e5 DS |
188 | } |
189 | ||
6ffb221a | 190 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 191 | { |
dd43de20 | 192 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 193 | outb(command, ec->command_addr); |
9e295ac1 | 194 | ec->curr->timestamp = jiffies; |
45bea155 LY |
195 | } |
196 | ||
6ffb221a | 197 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 198 | { |
dd43de20 | 199 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 200 | outb(data, ec->data_addr); |
9e295ac1 | 201 | ec->curr->timestamp = jiffies; |
703959d4 | 202 | } |
45bea155 | 203 | |
e34c0e2b LZ |
204 | #ifdef DEBUG |
205 | static const char *acpi_ec_cmd_string(u8 cmd) | |
206 | { | |
207 | switch (cmd) { | |
208 | case 0x80: | |
209 | return "RD_EC"; | |
210 | case 0x81: | |
211 | return "WR_EC"; | |
212 | case 0x82: | |
213 | return "BE_EC"; | |
214 | case 0x83: | |
215 | return "BD_EC"; | |
216 | case 0x84: | |
217 | return "QR_EC"; | |
218 | } | |
219 | return "UNKNOWN"; | |
220 | } | |
221 | #else | |
222 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
223 | #endif | |
224 | ||
ca37bfdf LZ |
225 | /* -------------------------------------------------------------------------- |
226 | * GPE Registers | |
227 | * -------------------------------------------------------------------------- */ | |
228 | ||
229 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
230 | { | |
231 | acpi_event_status gpe_status = 0; | |
232 | ||
233 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
234 | return (gpe_status & ACPI_EVENT_FLAG_SET) ? true : false; | |
235 | } | |
236 | ||
237 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
238 | { | |
239 | if (open) | |
240 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
241 | else { |
242 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 243 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 244 | } |
ca37bfdf LZ |
245 | if (acpi_ec_is_gpe_raised(ec)) { |
246 | /* | |
247 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
248 | * software need to manually trigger a pseudo GPE event on | |
249 | * EN=1 writes. | |
250 | */ | |
251 | pr_debug("***** Polling quirk *****\n"); | |
252 | advance_transaction(ec); | |
253 | } | |
254 | } | |
255 | ||
256 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
257 | { | |
258 | if (close) | |
259 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
260 | else { |
261 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 262 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 263 | } |
ca37bfdf LZ |
264 | } |
265 | ||
266 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
267 | { | |
268 | /* | |
269 | * GPE STS is a W1C register, which means: | |
270 | * 1. Software can clear it without worrying about clearing other | |
271 | * GPEs' STS bits when the hardware sets them in parallel. | |
272 | * 2. As long as software can ensure only clearing it when it is | |
273 | * set, hardware won't set it in parallel. | |
274 | * So software can clear GPE in any contexts. | |
275 | * Warning: do not move the check into advance_transaction() as the | |
276 | * EC commands will be sent without GPE raised. | |
277 | */ | |
278 | if (!acpi_ec_is_gpe_raised(ec)) | |
279 | return; | |
280 | acpi_clear_gpe(NULL, ec->gpe); | |
281 | } | |
282 | ||
283 | /* -------------------------------------------------------------------------- | |
284 | * Transaction Management | |
285 | * -------------------------------------------------------------------------- */ | |
286 | ||
9887d22a LZ |
287 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
288 | { | |
289 | ec->reference_count++; | |
290 | if (ec->reference_count == 1) | |
291 | acpi_ec_enable_gpe(ec, true); | |
292 | } | |
293 | ||
294 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
295 | { | |
296 | bool flushed = false; | |
297 | ||
298 | ec->reference_count--; | |
299 | if (ec->reference_count == 0) | |
300 | acpi_ec_disable_gpe(ec, true); | |
301 | flushed = acpi_ec_flushed(ec); | |
302 | if (flushed) | |
303 | wake_up(&ec->wait); | |
304 | } | |
305 | ||
e1d4d90f LZ |
306 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
307 | { | |
308 | if (!test_bit(flag, &ec->flags)) { | |
309 | acpi_ec_disable_gpe(ec, false); | |
310 | pr_debug("+++++ Polling enabled +++++\n"); | |
311 | set_bit(flag, &ec->flags); | |
312 | } | |
313 | } | |
314 | ||
315 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
316 | { | |
317 | if (test_bit(flag, &ec->flags)) { | |
318 | clear_bit(flag, &ec->flags); | |
319 | acpi_ec_enable_gpe(ec, false); | |
320 | pr_debug("+++++ Polling disabled +++++\n"); | |
321 | } | |
322 | } | |
323 | ||
9887d22a LZ |
324 | /* |
325 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
326 | * the flush operation is not in | |
327 | * progress | |
328 | * @ec: the EC device | |
f252cb09 | 329 | * @allow_event: whether event should be handled |
9887d22a LZ |
330 | * |
331 | * This function must be used before taking a new action that should hold | |
332 | * the reference count. If this function returns false, then the action | |
333 | * must be discarded or it will prevent the flush operation from being | |
334 | * completed. | |
f252cb09 LZ |
335 | * |
336 | * During flushing, QR_EC command need to pass this check when there is a | |
337 | * pending event, so that the reference count held for the pending event | |
338 | * can be decreased by the completion of the QR_EC command. | |
9887d22a | 339 | */ |
f252cb09 LZ |
340 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec, |
341 | bool allow_event) | |
9887d22a | 342 | { |
f252cb09 LZ |
343 | if (!acpi_ec_started(ec)) { |
344 | if (!allow_event || !acpi_ec_has_pending_event(ec)) | |
345 | return false; | |
346 | } | |
9887d22a LZ |
347 | acpi_ec_submit_request(ec); |
348 | return true; | |
349 | } | |
350 | ||
f252cb09 | 351 | static void acpi_ec_submit_event(struct acpi_ec *ec) |
74443bbe | 352 | { |
f252cb09 LZ |
353 | if (!test_bit(EC_FLAGS_EVENT_DETECTED, &ec->flags) || |
354 | !test_bit(EC_FLAGS_EVENT_ENABLED, &ec->flags)) | |
355 | return; | |
356 | /* Hold reference for pending event */ | |
357 | if (!acpi_ec_submit_flushable_request(ec, true)) | |
358 | return; | |
359 | if (!test_and_set_bit(EC_FLAGS_EVENT_PENDING, &ec->flags)) { | |
360 | pr_debug("***** Event query started *****\n"); | |
74443bbe | 361 | schedule_work(&ec->work); |
f252cb09 LZ |
362 | return; |
363 | } | |
364 | acpi_ec_complete_request(ec); | |
365 | } | |
366 | ||
367 | static void acpi_ec_complete_event(struct acpi_ec *ec) | |
368 | { | |
369 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
370 | clear_bit(EC_FLAGS_EVENT_PENDING, &ec->flags); | |
371 | pr_debug("***** Event query stopped *****\n"); | |
372 | /* Unhold reference for pending event */ | |
373 | acpi_ec_complete_request(ec); | |
374 | /* Check if there is another SCI_EVT detected */ | |
375 | acpi_ec_submit_event(ec); | |
376 | } | |
377 | } | |
378 | ||
379 | static void acpi_ec_submit_detection(struct acpi_ec *ec) | |
380 | { | |
381 | /* Hold reference for query submission */ | |
382 | if (!acpi_ec_submit_flushable_request(ec, false)) | |
383 | return; | |
384 | if (!test_and_set_bit(EC_FLAGS_EVENT_DETECTED, &ec->flags)) { | |
385 | pr_debug("***** Event detection blocked *****\n"); | |
386 | acpi_ec_submit_event(ec); | |
387 | return; | |
74443bbe | 388 | } |
f252cb09 | 389 | acpi_ec_complete_request(ec); |
74443bbe LZ |
390 | } |
391 | ||
f252cb09 | 392 | static void acpi_ec_complete_detection(struct acpi_ec *ec) |
74443bbe LZ |
393 | { |
394 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
f252cb09 LZ |
395 | clear_bit(EC_FLAGS_EVENT_DETECTED, &ec->flags); |
396 | pr_debug("***** Event detetion unblocked *****\n"); | |
397 | /* Unhold reference for query submission */ | |
398 | acpi_ec_complete_request(ec); | |
74443bbe LZ |
399 | } |
400 | } | |
401 | ||
f252cb09 LZ |
402 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
403 | { | |
404 | unsigned long flags; | |
405 | ||
406 | spin_lock_irqsave(&ec->lock, flags); | |
407 | set_bit(EC_FLAGS_EVENT_ENABLED, &ec->flags); | |
408 | /* | |
409 | * An event may be pending even with SCI_EVT=0, so QR_EC should | |
410 | * always be issued right after started. | |
411 | */ | |
412 | acpi_ec_submit_detection(ec); | |
413 | spin_unlock_irqrestore(&ec->lock, flags); | |
414 | } | |
415 | ||
f92fca00 | 416 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 417 | { |
7c6db4e0 AS |
418 | unsigned long flags; |
419 | int ret = 0; | |
7a73e60e | 420 | |
f351d027 | 421 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 422 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 423 | ret = 1; |
f351d027 | 424 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 425 | return ret; |
45bea155 | 426 | } |
451566f4 | 427 | |
0c78808f | 428 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 429 | { |
36b15875 | 430 | struct transaction *t; |
66b42b78 | 431 | u8 status; |
c0d65341 | 432 | bool wakeup = false; |
b76b51ba | 433 | |
c95f25b0 LZ |
434 | pr_debug("===== %s (%d) =====\n", |
435 | in_interrupt() ? "IRQ" : "TASK", smp_processor_id()); | |
ca37bfdf LZ |
436 | /* |
437 | * By always clearing STS before handling all indications, we can | |
438 | * ensure a hardware STS 0->1 change after this clearing can always | |
439 | * trigger a GPE interrupt. | |
440 | */ | |
441 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 442 | status = acpi_ec_read_status(ec); |
36b15875 | 443 | t = ec->curr; |
b76b51ba | 444 | if (!t) |
f92fca00 LZ |
445 | goto err; |
446 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
447 | if (t->wlen > t->wi) { | |
448 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
449 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
450 | else | |
451 | goto err; | |
452 | } else if (t->rlen > t->ri) { | |
453 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
454 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 455 | if (t->rlen == t->ri) { |
f92fca00 | 456 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
f252cb09 | 457 | acpi_ec_complete_event(ec); |
3afcf2ec | 458 | if (t->command == ACPI_EC_COMMAND_QUERY) |
e34c0e2b LZ |
459 | pr_debug("***** Command(%s) hardware completion *****\n", |
460 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
461 | wakeup = true; |
462 | } | |
f92fca00 LZ |
463 | } else |
464 | goto err; | |
465 | } else if (t->wlen == t->wi && | |
c0d65341 | 466 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 467 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
f252cb09 | 468 | acpi_ec_complete_event(ec); |
c0d65341 LZ |
469 | wakeup = true; |
470 | } | |
0c78808f | 471 | goto out; |
f92fca00 | 472 | } else { |
79149001 LZ |
473 | if (EC_FLAGS_QUERY_HANDSHAKE && |
474 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
475 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
476 | t->flags |= ACPI_EC_COMMAND_POLL; | |
f252cb09 | 477 | acpi_ec_complete_detection(ec); |
3afcf2ec LZ |
478 | t->rdata[t->ri++] = 0x00; |
479 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
f252cb09 | 480 | acpi_ec_complete_event(ec); |
e34c0e2b LZ |
481 | pr_debug("***** Command(%s) software completion *****\n", |
482 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
483 | wakeup = true; |
484 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
485 | acpi_ec_write_cmd(ec, t->command); |
486 | t->flags |= ACPI_EC_COMMAND_POLL; | |
f252cb09 | 487 | acpi_ec_complete_detection(ec); |
7c6db4e0 | 488 | } else |
dd15f8c4 | 489 | goto err; |
0c78808f | 490 | goto out; |
f92fca00 | 491 | } |
dd15f8c4 | 492 | err: |
a3cd8d27 FT |
493 | /* |
494 | * If SCI bit is set, then don't think it's a false IRQ | |
495 | * otherwise will take a not handled IRQ as a false one. | |
496 | */ | |
f92fca00 | 497 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
498 | if (in_interrupt() && t) { |
499 | if (t->irq_count < ec_storm_threshold) | |
500 | ++t->irq_count; | |
501 | /* Allow triggering on 0 threshold */ | |
502 | if (t->irq_count == ec_storm_threshold) | |
503 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
504 | } | |
f92fca00 | 505 | } |
0c78808f | 506 | out: |
74443bbe | 507 | if (status & ACPI_EC_FLAG_SCI) |
f252cb09 | 508 | acpi_ec_submit_detection(ec); |
0c78808f LZ |
509 | if (wakeup && in_interrupt()) |
510 | wake_up(&ec->wait); | |
f92fca00 | 511 | } |
a3cd8d27 | 512 | |
f92fca00 LZ |
513 | static void start_transaction(struct acpi_ec *ec) |
514 | { | |
515 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
516 | ec->curr->flags = 0; | |
9e295ac1 | 517 | ec->curr->timestamp = jiffies; |
0c78808f | 518 | advance_transaction(ec); |
845625cd | 519 | } |
03d1d99c | 520 | |
7c6db4e0 AS |
521 | static int ec_poll(struct acpi_ec *ec) |
522 | { | |
2a84cb98 | 523 | unsigned long flags; |
28fe5c82 | 524 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 525 | |
2a84cb98 AS |
526 | while (repeat--) { |
527 | unsigned long delay = jiffies + | |
7a18e96d | 528 | msecs_to_jiffies(ec_delay); |
9e295ac1 | 529 | unsigned long usecs = ACPI_EC_UDELAY_POLL; |
2a84cb98 AS |
530 | do { |
531 | /* don't sleep with disabled interrupts */ | |
532 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
9e295ac1 LZ |
533 | usecs = ACPI_EC_MSI_UDELAY; |
534 | udelay(usecs); | |
f92fca00 | 535 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
536 | return 0; |
537 | } else { | |
538 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 539 | ec_transaction_completed(ec), |
9e295ac1 | 540 | usecs_to_jiffies(usecs))) |
2a84cb98 AS |
541 | return 0; |
542 | } | |
f92fca00 | 543 | spin_lock_irqsave(&ec->lock, flags); |
9e295ac1 LZ |
544 | if (time_after(jiffies, |
545 | ec->curr->timestamp + | |
546 | usecs_to_jiffies(usecs))) | |
547 | advance_transaction(ec); | |
f92fca00 | 548 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 549 | } while (time_before(jiffies, delay)); |
16a26e85 | 550 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 551 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 552 | start_transaction(ec); |
f351d027 | 553 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 554 | } |
b77d81b2 | 555 | return -ETIME; |
1da177e4 LT |
556 | } |
557 | ||
8463200a | 558 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 559 | struct transaction *t) |
45bea155 | 560 | { |
7c6db4e0 | 561 | unsigned long tmp; |
7c6db4e0 | 562 | int ret = 0; |
7a73e60e | 563 | |
5423a0cb | 564 | if (EC_FLAGS_MSI) |
2a84cb98 | 565 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 566 | /* start transaction */ |
f351d027 | 567 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 568 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
f252cb09 | 569 | if (!acpi_ec_submit_flushable_request(ec, true)) { |
ad479e7f LZ |
570 | ret = -EINVAL; |
571 | goto unlock; | |
572 | } | |
7c6db4e0 | 573 | /* following two actions should be kept atomic */ |
8463200a | 574 | ec->curr = t; |
e34c0e2b LZ |
575 | pr_debug("***** Command(%s) started *****\n", |
576 | acpi_ec_cmd_string(t->command)); | |
a2f93aea | 577 | start_transaction(ec); |
df9ff918 LZ |
578 | spin_unlock_irqrestore(&ec->lock, tmp); |
579 | ret = ec_poll(ec); | |
580 | spin_lock_irqsave(&ec->lock, tmp); | |
e1d4d90f LZ |
581 | if (t->irq_count == ec_storm_threshold) |
582 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
e34c0e2b LZ |
583 | pr_debug("***** Command(%s) stopped *****\n", |
584 | acpi_ec_cmd_string(t->command)); | |
8463200a | 585 | ec->curr = NULL; |
9887d22a LZ |
586 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
587 | acpi_ec_complete_request(ec); | |
ad479e7f | 588 | unlock: |
f351d027 | 589 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
590 | return ret; |
591 | } | |
592 | ||
2a84cb98 | 593 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 594 | { |
d7a76e4c | 595 | int status; |
50526df6 | 596 | u32 glk; |
7a73e60e | 597 | |
8463200a | 598 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 599 | return -EINVAL; |
8463200a AS |
600 | if (t->rdata) |
601 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 602 | mutex_lock(&ec->mutex); |
703959d4 | 603 | if (ec->global_lock) { |
1da177e4 | 604 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 605 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
606 | status = -ENODEV; |
607 | goto unlock; | |
c24e912b | 608 | } |
1da177e4 | 609 | } |
a62e8f19 | 610 | |
2a84cb98 | 611 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 612 | |
e1d4d90f | 613 | if (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags)) |
54070101 | 614 | msleep(1); |
703959d4 | 615 | if (ec->global_lock) |
1da177e4 | 616 | acpi_release_global_lock(glk); |
7c6db4e0 | 617 | unlock: |
f351d027 | 618 | mutex_unlock(&ec->mutex); |
d550d98d | 619 | return status; |
1da177e4 LT |
620 | } |
621 | ||
8a383ef0 | 622 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
623 | { |
624 | u8 d; | |
8463200a AS |
625 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
626 | .wdata = NULL, .rdata = &d, | |
627 | .wlen = 0, .rlen = 1}; | |
628 | ||
2a84cb98 | 629 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
630 | } |
631 | ||
8a383ef0 | 632 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 633 | { |
8463200a AS |
634 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
635 | .wdata = NULL, .rdata = NULL, | |
636 | .wlen = 0, .rlen = 0}; | |
637 | ||
7c6db4e0 | 638 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 639 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
640 | } |
641 | ||
7a73e60e | 642 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
643 | { |
644 | int result; | |
645 | u8 d; | |
8463200a AS |
646 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
647 | .wdata = &address, .rdata = &d, | |
648 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 649 | |
2a84cb98 | 650 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
651 | *data = d; |
652 | return result; | |
653 | } | |
6ffb221a | 654 | |
3576cf61 DS |
655 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
656 | { | |
6ccedb10 | 657 | u8 wdata[2] = { address, data }; |
8463200a AS |
658 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
659 | .wdata = wdata, .rdata = NULL, | |
660 | .wlen = 2, .rlen = 0}; | |
661 | ||
2a84cb98 | 662 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
663 | } |
664 | ||
b76b51ba | 665 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 666 | { |
1da177e4 | 667 | int err; |
6ffb221a | 668 | u8 temp_data; |
1da177e4 LT |
669 | |
670 | if (!first_ec) | |
671 | return -ENODEV; | |
672 | ||
d033879c | 673 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
674 | |
675 | if (!err) { | |
676 | *val = temp_data; | |
677 | return 0; | |
7a73e60e LZ |
678 | } |
679 | return err; | |
1da177e4 LT |
680 | } |
681 | EXPORT_SYMBOL(ec_read); | |
682 | ||
50526df6 | 683 | int ec_write(u8 addr, u8 val) |
1da177e4 | 684 | { |
1da177e4 LT |
685 | int err; |
686 | ||
687 | if (!first_ec) | |
688 | return -ENODEV; | |
689 | ||
d033879c | 690 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
691 | |
692 | return err; | |
693 | } | |
694 | EXPORT_SYMBOL(ec_write); | |
695 | ||
616362de | 696 | int ec_transaction(u8 command, |
7a73e60e LZ |
697 | const u8 *wdata, unsigned wdata_len, |
698 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 699 | { |
8463200a AS |
700 | struct transaction t = {.command = command, |
701 | .wdata = wdata, .rdata = rdata, | |
702 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 703 | |
d7a76e4c LP |
704 | if (!first_ec) |
705 | return -ENODEV; | |
45bea155 | 706 | |
2a84cb98 | 707 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 708 | } |
ab9e43c6 LP |
709 | EXPORT_SYMBOL(ec_transaction); |
710 | ||
3e2abc5a SF |
711 | /* Get the handle to the EC device */ |
712 | acpi_handle ec_get_handle(void) | |
713 | { | |
714 | if (!first_ec) | |
715 | return NULL; | |
716 | return first_ec->handle; | |
717 | } | |
3e2abc5a SF |
718 | EXPORT_SYMBOL(ec_get_handle); |
719 | ||
ad332c8a | 720 | /* |
3eba563e | 721 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
722 | * Run with locked ec mutex. |
723 | */ | |
724 | static void acpi_ec_clear(struct acpi_ec *ec) | |
725 | { | |
726 | int i, status; | |
727 | u8 value = 0; | |
728 | ||
729 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 730 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
731 | if (status || !value) |
732 | break; | |
733 | } | |
734 | ||
735 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
736 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
737 | else | |
738 | pr_info("%d stale EC events cleared\n", i); | |
739 | } | |
740 | ||
ad479e7f LZ |
741 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
742 | { | |
743 | unsigned long flags; | |
744 | ||
745 | spin_lock_irqsave(&ec->lock, flags); | |
746 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
747 | pr_debug("+++++ Starting EC +++++\n"); | |
9887d22a | 748 | /* Enable GPE for event processing (SCI_EVT=1) */ |
e06bf91b | 749 | if (!resuming) |
9887d22a | 750 | acpi_ec_submit_request(ec); |
ad479e7f LZ |
751 | pr_info("+++++ EC started +++++\n"); |
752 | } | |
753 | spin_unlock_irqrestore(&ec->lock, flags); | |
754 | } | |
755 | ||
9887d22a LZ |
756 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
757 | { | |
758 | unsigned long flags; | |
759 | bool flushed; | |
760 | ||
761 | spin_lock_irqsave(&ec->lock, flags); | |
762 | flushed = acpi_ec_flushed(ec); | |
763 | spin_unlock_irqrestore(&ec->lock, flags); | |
764 | return flushed; | |
765 | } | |
766 | ||
ad479e7f LZ |
767 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
768 | { | |
769 | unsigned long flags; | |
770 | ||
771 | spin_lock_irqsave(&ec->lock, flags); | |
772 | if (acpi_ec_started(ec)) { | |
773 | pr_debug("+++++ Stopping EC +++++\n"); | |
774 | set_bit(EC_FLAGS_STOPPED, &ec->flags); | |
9887d22a LZ |
775 | spin_unlock_irqrestore(&ec->lock, flags); |
776 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
777 | spin_lock_irqsave(&ec->lock, flags); | |
778 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
e06bf91b | 779 | if (!suspending) |
9887d22a | 780 | acpi_ec_complete_request(ec); |
ad479e7f LZ |
781 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
782 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
783 | pr_info("+++++ EC stopped +++++\n"); | |
784 | } | |
785 | spin_unlock_irqrestore(&ec->lock, flags); | |
786 | } | |
787 | ||
fe955682 | 788 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
789 | { |
790 | struct acpi_ec *ec = first_ec; | |
791 | ||
792 | if (!ec) | |
793 | return; | |
794 | ||
f351d027 | 795 | mutex_lock(&ec->mutex); |
f6bb13aa | 796 | /* Prevent transactions from being carried out */ |
ad479e7f | 797 | acpi_ec_stop(ec, true); |
f351d027 | 798 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
799 | } |
800 | ||
fe955682 | 801 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
802 | { |
803 | struct acpi_ec *ec = first_ec; | |
804 | ||
805 | if (!ec) | |
806 | return; | |
807 | ||
f6bb13aa | 808 | /* Allow transactions to be carried out again */ |
ad479e7f | 809 | acpi_ec_start(ec, true); |
ad332c8a KC |
810 | |
811 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
812 | acpi_ec_clear(ec); | |
f6bb13aa RW |
813 | } |
814 | ||
fe955682 | 815 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
816 | { |
817 | /* | |
818 | * Allow transactions to happen again (this function is called from | |
819 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
820 | */ | |
821 | if (first_ec) | |
ad479e7f | 822 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
823 | } |
824 | ||
1da177e4 LT |
825 | /* -------------------------------------------------------------------------- |
826 | Event Management | |
827 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
828 | static struct acpi_ec_query_handler * |
829 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
830 | { | |
831 | if (handler) | |
832 | kref_get(&handler->kref); | |
833 | return handler; | |
834 | } | |
835 | ||
836 | static void acpi_ec_query_handler_release(struct kref *kref) | |
837 | { | |
838 | struct acpi_ec_query_handler *handler = | |
839 | container_of(kref, struct acpi_ec_query_handler, kref); | |
840 | ||
841 | kfree(handler); | |
842 | } | |
843 | ||
844 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
845 | { | |
846 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
847 | } | |
848 | ||
837012ed AS |
849 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
850 | acpi_handle handle, acpi_ec_query_func func, | |
851 | void *data) | |
852 | { | |
853 | struct acpi_ec_query_handler *handler = | |
854 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 855 | |
837012ed AS |
856 | if (!handler) |
857 | return -ENOMEM; | |
858 | ||
859 | handler->query_bit = query_bit; | |
860 | handler->handle = handle; | |
861 | handler->func = func; | |
862 | handler->data = data; | |
f351d027 | 863 | mutex_lock(&ec->mutex); |
01305d41 | 864 | kref_init(&handler->kref); |
30c08574 | 865 | list_add(&handler->node, &ec->list); |
f351d027 | 866 | mutex_unlock(&ec->mutex); |
837012ed AS |
867 | return 0; |
868 | } | |
837012ed AS |
869 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
870 | ||
871 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
872 | { | |
1544fdbc | 873 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 874 | LIST_HEAD(free_list); |
7a73e60e | 875 | |
f351d027 | 876 | mutex_lock(&ec->mutex); |
1544fdbc | 877 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 878 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
879 | list_del_init(&handler->node); |
880 | list_add(&handler->node, &free_list); | |
837012ed AS |
881 | } |
882 | } | |
f351d027 | 883 | mutex_unlock(&ec->mutex); |
01305d41 LZ |
884 | list_for_each_entry(handler, &free_list, node) |
885 | acpi_ec_put_query_handler(handler); | |
837012ed | 886 | } |
837012ed | 887 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 888 | |
a62e8f19 | 889 | static void acpi_ec_run(void *cxt) |
45bea155 | 890 | { |
a62e8f19 | 891 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 892 | |
a62e8f19 | 893 | if (!handler) |
e41334c0 | 894 | return; |
d3090b6a | 895 | pr_debug("##### Query(0x%02x) started #####\n", handler->query_bit); |
a62e8f19 AS |
896 | if (handler->func) |
897 | handler->func(handler->data); | |
898 | else if (handler->handle) | |
899 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
d3090b6a | 900 | pr_debug("##### Query(0x%02x) stopped #####\n", handler->query_bit); |
01305d41 | 901 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
902 | } |
903 | ||
550b3aac | 904 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
905 | { |
906 | u8 value = 0; | |
c2cf5769 LZ |
907 | int result; |
908 | acpi_status status; | |
01305d41 | 909 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
910 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
911 | .wdata = NULL, .rdata = &value, | |
912 | .wlen = 0, .rlen = 1}; | |
3eba563e | 913 | |
550b3aac LZ |
914 | /* |
915 | * Query the EC to find out which _Qxx method we need to evaluate. | |
916 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
917 | * bit to be cleared (and thus clearing the interrupt source). | |
918 | */ | |
919 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
920 | if (result) |
921 | return result; | |
550b3aac LZ |
922 | if (data) |
923 | *data = value; | |
924 | if (!value) | |
925 | return -ENODATA; | |
3eba563e | 926 | |
550b3aac | 927 | mutex_lock(&ec->mutex); |
837012ed AS |
928 | list_for_each_entry(handler, &ec->list, node) { |
929 | if (value == handler->query_bit) { | |
930 | /* have custom handler for this bit */ | |
01305d41 | 931 | handler = acpi_ec_get_query_handler(handler); |
d3090b6a LZ |
932 | pr_debug("##### Query(0x%02x) scheduled #####\n", |
933 | handler->query_bit); | |
c2cf5769 | 934 | status = acpi_os_execute((handler->func) ? |
f5347867 | 935 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 936 | acpi_ec_run, handler); |
c2cf5769 LZ |
937 | if (ACPI_FAILURE(status)) |
938 | result = -EBUSY; | |
939 | break; | |
837012ed AS |
940 | } |
941 | } | |
550b3aac | 942 | mutex_unlock(&ec->mutex); |
c2cf5769 | 943 | return result; |
a62e8f19 AS |
944 | } |
945 | ||
74443bbe | 946 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 947 | { |
74443bbe | 948 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 949 | |
f252cb09 | 950 | pr_debug("***** Event poller started *****\n"); |
550b3aac | 951 | acpi_ec_query(ec, NULL); |
f252cb09 | 952 | pr_debug("***** Event poller stopped *****\n"); |
45bea155 | 953 | } |
1da177e4 | 954 | |
8b6cd8ad LM |
955 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
956 | u32 gpe_number, void *data) | |
1da177e4 | 957 | { |
f92fca00 | 958 | unsigned long flags; |
3d02b90b | 959 | struct acpi_ec *ec = data; |
7c6db4e0 | 960 | |
f92fca00 | 961 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 962 | advance_transaction(ec); |
c0d65341 | 963 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 964 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
965 | } |
966 | ||
1da177e4 | 967 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
968 | * Address Space Management |
969 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 970 | |
1da177e4 | 971 | static acpi_status |
5b7734b4 | 972 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 973 | u32 bits, u64 *value64, |
50526df6 | 974 | void *handler_context, void *region_context) |
1da177e4 | 975 | { |
3d02b90b | 976 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
977 | int result = 0, i, bytes = bits / 8; |
978 | u8 *value = (u8 *)value64; | |
1da177e4 | 979 | |
1da177e4 | 980 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 981 | return AE_BAD_PARAMETER; |
1da177e4 | 982 | |
5b7734b4 | 983 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 984 | return AE_BAD_PARAMETER; |
1da177e4 | 985 | |
dadf28a1 | 986 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 987 | acpi_ec_burst_enable(ec); |
b3b233c7 | 988 | |
dadf28a1 AS |
989 | for (i = 0; i < bytes; ++i, ++address, ++value) |
990 | result = (function == ACPI_READ) ? | |
991 | acpi_ec_read(ec, address, value) : | |
992 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 993 | |
dadf28a1 | 994 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 995 | acpi_ec_burst_disable(ec); |
b3b233c7 | 996 | |
1da177e4 LT |
997 | switch (result) { |
998 | case -EINVAL: | |
d550d98d | 999 | return AE_BAD_PARAMETER; |
1da177e4 | 1000 | case -ENODEV: |
d550d98d | 1001 | return AE_NOT_FOUND; |
1da177e4 | 1002 | case -ETIME: |
d550d98d | 1003 | return AE_TIME; |
1da177e4 | 1004 | default: |
d550d98d | 1005 | return AE_OK; |
1da177e4 | 1006 | } |
1da177e4 LT |
1007 | } |
1008 | ||
1da177e4 | 1009 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1010 | * Driver Interface |
1011 | * -------------------------------------------------------------------------- */ | |
1012 | ||
c0900c35 AS |
1013 | static acpi_status |
1014 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1015 | ||
c0900c35 AS |
1016 | static struct acpi_ec *make_acpi_ec(void) |
1017 | { | |
1018 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1019 | |
c0900c35 AS |
1020 | if (!ec) |
1021 | return NULL; | |
f351d027 | 1022 | mutex_init(&ec->mutex); |
c0900c35 | 1023 | init_waitqueue_head(&ec->wait); |
837012ed | 1024 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1025 | spin_lock_init(&ec->lock); |
74443bbe | 1026 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
c0900c35 AS |
1027 | return ec; |
1028 | } | |
837012ed | 1029 | |
c019b193 AS |
1030 | static acpi_status |
1031 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1032 | void *context, void **return_value) | |
1033 | { | |
0175d562 LM |
1034 | char node_name[5]; |
1035 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1036 | struct acpi_ec *ec = context; |
1037 | int value = 0; | |
0175d562 LM |
1038 | acpi_status status; |
1039 | ||
1040 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1041 | ||
7a73e60e | 1042 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1043 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1044 | return AE_OK; |
1045 | } | |
1046 | ||
cd8c93a4 AS |
1047 | static acpi_status |
1048 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1049 | { |
cd8c93a4 | 1050 | acpi_status status; |
d21cf3c1 | 1051 | unsigned long long tmp = 0; |
cd8c93a4 | 1052 | struct acpi_ec *ec = context; |
a5032bfd AS |
1053 | |
1054 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1055 | ec->command_addr = ec->data_addr = 0; | |
1056 | ||
cd8c93a4 AS |
1057 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1058 | ec_parse_io_ports, ec); | |
1059 | if (ACPI_FAILURE(status)) | |
1060 | return status; | |
837012ed AS |
1061 | |
1062 | /* Get GPE bit assignment (EC events). */ | |
1063 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1064 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1065 | if (ACPI_FAILURE(status)) |
1066 | return status; | |
27663c58 | 1067 | ec->gpe = tmp; |
837012ed | 1068 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1069 | tmp = 0; |
27663c58 MW |
1070 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1071 | ec->global_lock = tmp; | |
837012ed | 1072 | ec->handle = handle; |
cd8c93a4 | 1073 | return AE_CTRL_TERMINATE; |
837012ed AS |
1074 | } |
1075 | ||
5efc5476 BH |
1076 | static int ec_install_handlers(struct acpi_ec *ec) |
1077 | { | |
1078 | acpi_status status; | |
7a73e60e | 1079 | |
5efc5476 BH |
1080 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1081 | return 0; | |
ca37bfdf | 1082 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1083 | ACPI_GPE_EDGE_TRIGGERED, |
1084 | &acpi_ec_gpe_handler, ec); | |
1085 | if (ACPI_FAILURE(status)) | |
1086 | return -ENODEV; | |
9630bdd9 | 1087 | |
ad479e7f | 1088 | acpi_ec_start(ec, false); |
5efc5476 BH |
1089 | status = acpi_install_address_space_handler(ec->handle, |
1090 | ACPI_ADR_SPACE_EC, | |
1091 | &acpi_ec_space_handler, | |
1092 | NULL, ec); | |
1093 | if (ACPI_FAILURE(status)) { | |
1094 | if (status == AE_NOT_FOUND) { | |
1095 | /* | |
1096 | * Maybe OS fails in evaluating the _REG object. | |
1097 | * The AE_NOT_FOUND error will be ignored and OS | |
1098 | * continue to initialize EC. | |
1099 | */ | |
16a26e85 | 1100 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1101 | " of EC device. Broken bios is suspected.\n"); |
1102 | } else { | |
ad479e7f | 1103 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1104 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1105 | &acpi_ec_gpe_handler); | |
1106 | return -ENODEV; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
4c611060 AS |
1114 | static void ec_remove_handlers(struct acpi_ec *ec) |
1115 | { | |
1741acea LZ |
1116 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1117 | return; | |
ad479e7f | 1118 | acpi_ec_stop(ec, false); |
4c611060 AS |
1119 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1120 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1121 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1122 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1123 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1124 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1125 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1126 | } |
1127 | ||
703959d4 | 1128 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1129 | { |
703959d4 | 1130 | struct acpi_ec *ec = NULL; |
d02be047 | 1131 | int ret; |
45bea155 | 1132 | |
c0900c35 AS |
1133 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1134 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1135 | ||
4c611060 | 1136 | /* Check for boot EC */ |
ce52ddf5 AS |
1137 | if (boot_ec && |
1138 | (boot_ec->handle == device->handle || | |
1139 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1140 | ec = boot_ec; | |
1141 | boot_ec = NULL; | |
1142 | } else { | |
1143 | ec = make_acpi_ec(); | |
1144 | if (!ec) | |
1145 | return -ENOMEM; | |
a5032bfd AS |
1146 | } |
1147 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1148 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1149 | kfree(ec); |
1150 | return -EINVAL; | |
4c611060 AS |
1151 | } |
1152 | ||
ce52ddf5 AS |
1153 | /* Find and register all query methods */ |
1154 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1155 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1156 | |
4c611060 AS |
1157 | if (!first_ec) |
1158 | first_ec = ec; | |
db89b4f0 | 1159 | device->driver_data = ec; |
de4f1046 | 1160 | |
d6795fe3 AK |
1161 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1162 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1163 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1164 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1165 | |
16a26e85 | 1166 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1167 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1168 | |
1169 | ret = ec_install_handlers(ec); | |
1170 | ||
1171 | /* EC is fully operational, allow queries */ | |
f252cb09 | 1172 | acpi_ec_enable_event(ec); |
ad332c8a KC |
1173 | |
1174 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1175 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1176 | acpi_ec_clear(ec); |
5efc5476 | 1177 | return ret; |
1da177e4 LT |
1178 | } |
1179 | ||
51fac838 | 1180 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1181 | { |
01f22462 | 1182 | struct acpi_ec *ec; |
07ddf768 | 1183 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1184 | |
1da177e4 | 1185 | if (!device) |
d550d98d | 1186 | return -EINVAL; |
1da177e4 LT |
1187 | |
1188 | ec = acpi_driver_data(device); | |
cf745ec7 | 1189 | ec_remove_handlers(ec); |
f351d027 | 1190 | mutex_lock(&ec->mutex); |
07ddf768 | 1191 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1192 | list_del(&handler->node); |
1193 | kfree(handler); | |
1194 | } | |
f351d027 | 1195 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1196 | release_region(ec->data_addr, 1); |
1197 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1198 | device->driver_data = NULL; |
d033879c | 1199 | if (ec == first_ec) |
c0900c35 | 1200 | first_ec = NULL; |
4c611060 | 1201 | kfree(ec); |
d550d98d | 1202 | return 0; |
1da177e4 LT |
1203 | } |
1204 | ||
1da177e4 | 1205 | static acpi_status |
c0900c35 | 1206 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1207 | { |
3d02b90b | 1208 | struct acpi_ec *ec = context; |
1da177e4 | 1209 | |
01f22462 | 1210 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1211 | return AE_OK; |
1da177e4 LT |
1212 | |
1213 | /* | |
1214 | * The first address region returned is the data port, and | |
1215 | * the second address region returned is the status/command | |
1216 | * port. | |
1217 | */ | |
de4f1046 | 1218 | if (ec->data_addr == 0) |
6ffb221a | 1219 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1220 | else if (ec->command_addr == 0) |
6ffb221a | 1221 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1222 | else |
1da177e4 | 1223 | return AE_CTRL_TERMINATE; |
1da177e4 | 1224 | |
1da177e4 LT |
1225 | return AE_OK; |
1226 | } | |
1227 | ||
c04209a7 AS |
1228 | int __init acpi_boot_ec_enable(void) |
1229 | { | |
7c6db4e0 | 1230 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1231 | return 0; |
1232 | if (!ec_install_handlers(boot_ec)) { | |
1233 | first_ec = boot_ec; | |
1234 | return 0; | |
1235 | } | |
1236 | return -EFAULT; | |
1237 | } | |
1238 | ||
223883b7 AS |
1239 | static const struct acpi_device_id ec_device_ids[] = { |
1240 | {"PNP0C09", 0}, | |
1241 | {"", 0}, | |
1242 | }; | |
1243 | ||
478fa03b AS |
1244 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1245 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1246 | { | |
1247 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1248 | return 0; | |
1249 | } | |
1250 | ||
0adf3c74 AS |
1251 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1252 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1253 | { | |
1254 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | /* MSI EC needs special treatment, enable it */ | |
1259 | static int ec_flag_msi(const struct dmi_system_id *id) | |
1260 | { | |
16a26e85 | 1261 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
1262 | EC_FLAGS_MSI = 1; |
1263 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1264 | return 0; | |
1265 | } | |
1266 | ||
67bfa9b6 FT |
1267 | /* |
1268 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
1269 | * the GPE storm threshold back to 20 | |
1270 | */ | |
1271 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
1272 | { | |
1273 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
1274 | ec_storm_threshold = 20; | |
1275 | return 0; | |
1276 | } | |
1277 | ||
79149001 LZ |
1278 | /* |
1279 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1280 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1281 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1282 | */ | |
1283 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1284 | { | |
1285 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1286 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1287 | return 0; | |
1288 | } | |
1289 | ||
ad332c8a KC |
1290 | /* |
1291 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1292 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1293 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1294 | * | |
1295 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1296 | * | |
1297 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1298 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1299 | * behaviour is not known at this time. | |
1300 | * | |
1301 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1302 | * however it is very likely that other Samsung models are affected. | |
1303 | * | |
1304 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1305 | * should be harmless. | |
1306 | */ | |
1307 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1308 | { | |
1309 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1310 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1311 | return 0; | |
1312 | } | |
1313 | ||
6cef7497 | 1314 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1315 | { |
1316 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1317 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1318 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1319 | { |
1320 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1321 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1322 | { | |
1323 | ec_flag_msi, "MSI hardware", { | |
1324 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1325 | { | |
1326 | ec_flag_msi, "MSI hardware", { | |
1327 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1328 | { |
a5dc4f89 AS |
1329 | ec_flag_msi, "MSI hardware", { |
1330 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1331 | { | |
534bc4e3 ZR |
1332 | ec_flag_msi, "Quanta hardware", { |
1333 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1334 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1335 | { | |
1336 | ec_flag_msi, "Quanta hardware", { | |
1337 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1338 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1339 | { | |
777cb382 LT |
1340 | ec_flag_msi, "Clevo W350etq", { |
1341 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1342 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1343 | { | |
0adf3c74 AS |
1344 | ec_validate_ecdt, "ASUS hardware", { |
1345 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1346 | { |
1347 | ec_validate_ecdt, "ASUS hardware", { | |
1348 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1349 | { |
1350 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1351 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1352 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1353 | { |
1354 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1355 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1356 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1357 | { |
1358 | ec_validate_ecdt, "ASUS hardware", { | |
1359 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1360 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1361 | { |
1362 | ec_clear_on_resume, "Samsung hardware", { | |
1363 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1364 | { |
1365 | ec_flag_query_handshake, "Acer hardware", { | |
1366 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1367 | {}, |
1368 | }; | |
1369 | ||
c0900c35 AS |
1370 | int __init acpi_ec_ecdt_probe(void) |
1371 | { | |
c0900c35 | 1372 | acpi_status status; |
c6cb0e87 | 1373 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1374 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1375 | |
d66d969d AS |
1376 | boot_ec = make_acpi_ec(); |
1377 | if (!boot_ec) | |
c0900c35 AS |
1378 | return -ENOMEM; |
1379 | /* | |
1380 | * Generate a boot ec context | |
1381 | */ | |
0adf3c74 | 1382 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1383 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1384 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1385 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1386 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1387 | boot_ec->command_addr = ecdt_ptr->control.address; |
1388 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1389 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1390 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1391 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1392 | &boot_ec->handle); | |
c6cb0e87 | 1393 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1394 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1395 | goto install; |
d6bd535d | 1396 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1397 | if (!saved_ec) |
1398 | return -ENOMEM; | |
c5279dee | 1399 | /* fall through */ |
cd8c93a4 | 1400 | } |
0adf3c74 | 1401 | |
ed4b197d CIK |
1402 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1403 | kfree(saved_ec); | |
478fa03b | 1404 | return -ENODEV; |
ed4b197d | 1405 | } |
478fa03b | 1406 | |
c5279dee AS |
1407 | /* This workaround is needed only on some broken machines, |
1408 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1409 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1410 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1411 | boot_ec, NULL); | |
1412 | /* Check that acpi_get_devices actually find something */ | |
1413 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1414 | goto error; | |
c6cb0e87 AS |
1415 | if (saved_ec) { |
1416 | /* try to find good ECDT from ASUSTek */ | |
1417 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1418 | saved_ec->data_addr != boot_ec->data_addr || | |
1419 | saved_ec->gpe != boot_ec->gpe || | |
1420 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1421 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1422 | "ECDT tables, which are very hard to workaround. " |
1423 | "Trying to use DSDT EC info instead. Please send " | |
1424 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1425 | kfree(saved_ec); | |
1426 | saved_ec = NULL; | |
1427 | } else { | |
1428 | /* We really need to limit this workaround, the only ASUS, | |
1429 | * which needs it, has fake EC._INI method, so use it as flag. | |
1430 | * Keep boot_ec struct as it will be needed soon. | |
1431 | */ | |
c6cb0e87 | 1432 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1433 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1434 | return -ENODEV; |
1435 | } | |
c5279dee AS |
1436 | install: |
1437 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1438 | first_ec = boot_ec; |
e8284321 | 1439 | return 0; |
d033879c | 1440 | } |
c5279dee | 1441 | error: |
d66d969d | 1442 | kfree(boot_ec); |
ed4b197d | 1443 | kfree(saved_ec); |
d66d969d | 1444 | boot_ec = NULL; |
1da177e4 LT |
1445 | return -ENODEV; |
1446 | } | |
1447 | ||
223883b7 AS |
1448 | static struct acpi_driver acpi_ec_driver = { |
1449 | .name = "ec", | |
1450 | .class = ACPI_EC_CLASS, | |
1451 | .ids = ec_device_ids, | |
1452 | .ops = { | |
1453 | .add = acpi_ec_add, | |
1454 | .remove = acpi_ec_remove, | |
223883b7 AS |
1455 | }, |
1456 | }; | |
1457 | ||
a5f820fe | 1458 | int __init acpi_ec_init(void) |
1da177e4 | 1459 | { |
50526df6 | 1460 | int result = 0; |
1da177e4 | 1461 | |
1da177e4 LT |
1462 | /* Now register the driver for the EC */ |
1463 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1464 | if (result < 0) |
d550d98d | 1465 | return -ENODEV; |
1da177e4 | 1466 | |
d550d98d | 1467 | return result; |
1da177e4 LT |
1468 | } |
1469 | ||
1da177e4 LT |
1470 | /* EC driver currently not unloadable */ |
1471 | #if 0 | |
50526df6 | 1472 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1473 | { |
1da177e4 LT |
1474 | |
1475 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1476 | } |
7843932a | 1477 | #endif /* 0 */ |