Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
a8d4fc22 | 2 | * ec.c - ACPI Embedded Controller Driver (v3) |
1da177e4 | 3 | * |
a8d4fc22 LZ |
4 | * Copyright (C) 2001-2015 Intel Corporation |
5 | * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> | |
4a3f6b5b LZ |
6 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
7 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> | |
8 | * 2004 Luming Yu <luming.yu@intel.com> | |
9 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
10 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
11 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> | |
1da177e4 LT |
12 | * |
13 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or (at | |
18 | * your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, but | |
21 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | * General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License along | |
26 | * with this program; if not, write to the Free Software Foundation, Inc., | |
27 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
28 | * | |
29 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
30 | */ | |
31 | ||
7c6db4e0 | 32 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 33 | /* #define DEBUG */ |
16a26e85 | 34 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 35 | |
1da177e4 LT |
36 | #include <linux/kernel.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/delay.h> | |
451566f4 | 41 | #include <linux/interrupt.h> |
837012ed | 42 | #include <linux/list.h> |
7c6db4e0 | 43 | #include <linux/spinlock.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
8b48463f | 45 | #include <linux/acpi.h> |
eb27cae8 | 46 | #include <linux/dmi.h> |
8b48463f | 47 | #include <asm/io.h> |
1da177e4 | 48 | |
1195a098 TR |
49 | #include "internal.h" |
50 | ||
1da177e4 | 51 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
52 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
53 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 54 | |
703959d4 | 55 | /* EC status register */ |
1da177e4 LT |
56 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
57 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 58 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 59 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 60 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 61 | |
703959d4 | 62 | /* EC commands */ |
3261ff4d | 63 | enum ec_command { |
6ccedb10 AS |
64 | ACPI_EC_COMMAND_READ = 0x80, |
65 | ACPI_EC_COMMAND_WRITE = 0x81, | |
66 | ACPI_EC_BURST_ENABLE = 0x82, | |
67 | ACPI_EC_BURST_DISABLE = 0x83, | |
68 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 69 | }; |
837012ed | 70 | |
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
d8d031a6 | 73 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
ad332c8a KC |
74 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
75 | * when trying to clear the EC */ | |
703959d4 | 76 | |
080e412c | 77 | enum { |
37d11391 | 78 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
f6bb13aa | 79 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 80 | * OpReg are installed */ |
ad479e7f LZ |
81 | EC_FLAGS_STARTED, /* Driver is started */ |
82 | EC_FLAGS_STOPPED, /* Driver is stopped */ | |
e1d4d90f LZ |
83 | EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the |
84 | * current command processing */ | |
1da177e4 | 85 | }; |
6ffb221a | 86 | |
f92fca00 LZ |
87 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
88 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
89 | ||
7a18e96d TR |
90 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
91 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
92 | module_param(ec_delay, uint, 0644); | |
93 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
94 | ||
15de603b LZ |
95 | static bool ec_busy_polling __read_mostly; |
96 | module_param(ec_busy_polling, bool, 0644); | |
97 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); | |
98 | ||
99 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; | |
100 | module_param(ec_polling_guard, uint, 0644); | |
101 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); | |
102 | ||
a520d52e FT |
103 | /* |
104 | * If the number of false interrupts per one transaction exceeds | |
105 | * this threshold, will think there is a GPE storm happened and | |
106 | * will disable the GPE for normal transaction. | |
107 | */ | |
108 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
109 | module_param(ec_storm_threshold, uint, 0644); | |
110 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
111 | ||
837012ed AS |
112 | struct acpi_ec_query_handler { |
113 | struct list_head node; | |
114 | acpi_ec_query_func func; | |
115 | acpi_handle handle; | |
116 | void *data; | |
117 | u8 query_bit; | |
01305d41 | 118 | struct kref kref; |
837012ed AS |
119 | }; |
120 | ||
8463200a | 121 | struct transaction { |
7c6db4e0 AS |
122 | const u8 *wdata; |
123 | u8 *rdata; | |
124 | unsigned short irq_count; | |
8463200a | 125 | u8 command; |
a2f93aea AS |
126 | u8 wi; |
127 | u8 ri; | |
7c6db4e0 AS |
128 | u8 wlen; |
129 | u8 rlen; | |
f92fca00 | 130 | u8 flags; |
7c6db4e0 AS |
131 | }; |
132 | ||
550b3aac | 133 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
ca37bfdf | 134 | static void advance_transaction(struct acpi_ec *ec); |
74443bbe | 135 | |
1195a098 TR |
136 | struct acpi_ec *boot_ec, *first_ec; |
137 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 138 | |
0adf3c74 | 139 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 140 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 141 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
79149001 | 142 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
5423a0cb | 143 | |
3535a3c1 LZ |
144 | /* -------------------------------------------------------------------------- |
145 | * Logging/Debugging | |
146 | * -------------------------------------------------------------------------- */ | |
147 | ||
148 | /* | |
149 | * Splitters used by the developers to track the boundary of the EC | |
150 | * handling processes. | |
151 | */ | |
152 | #ifdef DEBUG | |
153 | #define EC_DBG_SEP " " | |
154 | #define EC_DBG_DRV "+++++" | |
155 | #define EC_DBG_STM "=====" | |
156 | #define EC_DBG_REQ "*****" | |
157 | #define EC_DBG_EVT "#####" | |
158 | #else | |
159 | #define EC_DBG_SEP "" | |
160 | #define EC_DBG_DRV | |
161 | #define EC_DBG_STM | |
162 | #define EC_DBG_REQ | |
163 | #define EC_DBG_EVT | |
164 | #endif | |
165 | ||
166 | #define ec_log_raw(fmt, ...) \ | |
167 | pr_info(fmt "\n", ##__VA_ARGS__) | |
168 | #define ec_dbg_raw(fmt, ...) \ | |
169 | pr_debug(fmt "\n", ##__VA_ARGS__) | |
170 | #define ec_log(filter, fmt, ...) \ | |
171 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
172 | #define ec_dbg(filter, fmt, ...) \ | |
173 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) | |
174 | ||
175 | #define ec_log_drv(fmt, ...) \ | |
176 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
177 | #define ec_dbg_drv(fmt, ...) \ | |
178 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) | |
179 | #define ec_dbg_stm(fmt, ...) \ | |
180 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) | |
181 | #define ec_dbg_req(fmt, ...) \ | |
182 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) | |
183 | #define ec_dbg_evt(fmt, ...) \ | |
184 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) | |
770970f0 LZ |
185 | #define ec_dbg_ref(ec, fmt, ...) \ |
186 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) | |
3535a3c1 | 187 | |
ad479e7f LZ |
188 | /* -------------------------------------------------------------------------- |
189 | * Device Flags | |
190 | * -------------------------------------------------------------------------- */ | |
191 | ||
192 | static bool acpi_ec_started(struct acpi_ec *ec) | |
193 | { | |
194 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && | |
195 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); | |
196 | } | |
197 | ||
9887d22a LZ |
198 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
199 | { | |
200 | return ec->reference_count == 1; | |
201 | } | |
202 | ||
1da177e4 | 203 | /* -------------------------------------------------------------------------- |
ca37bfdf | 204 | * EC Registers |
7a73e60e | 205 | * -------------------------------------------------------------------------- */ |
1da177e4 | 206 | |
6ffb221a | 207 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 208 | { |
3ebe08a7 | 209 | u8 x = inb(ec->command_addr); |
7a73e60e | 210 | |
3535a3c1 LZ |
211 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
212 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", | |
213 | x, | |
214 | !!(x & ACPI_EC_FLAG_SCI), | |
215 | !!(x & ACPI_EC_FLAG_BURST), | |
216 | !!(x & ACPI_EC_FLAG_CMD), | |
217 | !!(x & ACPI_EC_FLAG_IBF), | |
218 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 219 | return x; |
451566f4 DT |
220 | } |
221 | ||
6ffb221a | 222 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 223 | { |
3ebe08a7 | 224 | u8 x = inb(ec->data_addr); |
7a73e60e | 225 | |
d8d031a6 | 226 | ec->timestamp = jiffies; |
3535a3c1 | 227 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
7c6db4e0 | 228 | return x; |
7c6db5e5 DS |
229 | } |
230 | ||
6ffb221a | 231 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 232 | { |
3535a3c1 | 233 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
6ffb221a | 234 | outb(command, ec->command_addr); |
d8d031a6 | 235 | ec->timestamp = jiffies; |
45bea155 LY |
236 | } |
237 | ||
6ffb221a | 238 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 239 | { |
3535a3c1 | 240 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
6ffb221a | 241 | outb(data, ec->data_addr); |
d8d031a6 | 242 | ec->timestamp = jiffies; |
703959d4 | 243 | } |
45bea155 | 244 | |
e34c0e2b LZ |
245 | #ifdef DEBUG |
246 | static const char *acpi_ec_cmd_string(u8 cmd) | |
247 | { | |
248 | switch (cmd) { | |
249 | case 0x80: | |
250 | return "RD_EC"; | |
251 | case 0x81: | |
252 | return "WR_EC"; | |
253 | case 0x82: | |
254 | return "BE_EC"; | |
255 | case 0x83: | |
256 | return "BD_EC"; | |
257 | case 0x84: | |
258 | return "QR_EC"; | |
259 | } | |
260 | return "UNKNOWN"; | |
261 | } | |
262 | #else | |
263 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
264 | #endif | |
265 | ||
ca37bfdf LZ |
266 | /* -------------------------------------------------------------------------- |
267 | * GPE Registers | |
268 | * -------------------------------------------------------------------------- */ | |
269 | ||
270 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) | |
271 | { | |
272 | acpi_event_status gpe_status = 0; | |
273 | ||
274 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); | |
7c0b2595 | 275 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
ca37bfdf LZ |
276 | } |
277 | ||
278 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) | |
279 | { | |
280 | if (open) | |
281 | acpi_enable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
282 | else { |
283 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 284 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
e1d4d90f | 285 | } |
ca37bfdf LZ |
286 | if (acpi_ec_is_gpe_raised(ec)) { |
287 | /* | |
288 | * On some platforms, EN=1 writes cannot trigger GPE. So | |
289 | * software need to manually trigger a pseudo GPE event on | |
290 | * EN=1 writes. | |
291 | */ | |
3535a3c1 | 292 | ec_dbg_raw("Polling quirk"); |
ca37bfdf LZ |
293 | advance_transaction(ec); |
294 | } | |
295 | } | |
296 | ||
297 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) | |
298 | { | |
299 | if (close) | |
300 | acpi_disable_gpe(NULL, ec->gpe); | |
e1d4d90f LZ |
301 | else { |
302 | BUG_ON(ec->reference_count < 1); | |
ca37bfdf | 303 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
e1d4d90f | 304 | } |
ca37bfdf LZ |
305 | } |
306 | ||
307 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) | |
308 | { | |
309 | /* | |
310 | * GPE STS is a W1C register, which means: | |
311 | * 1. Software can clear it without worrying about clearing other | |
312 | * GPEs' STS bits when the hardware sets them in parallel. | |
313 | * 2. As long as software can ensure only clearing it when it is | |
314 | * set, hardware won't set it in parallel. | |
315 | * So software can clear GPE in any contexts. | |
316 | * Warning: do not move the check into advance_transaction() as the | |
317 | * EC commands will be sent without GPE raised. | |
318 | */ | |
319 | if (!acpi_ec_is_gpe_raised(ec)) | |
320 | return; | |
321 | acpi_clear_gpe(NULL, ec->gpe); | |
322 | } | |
323 | ||
324 | /* -------------------------------------------------------------------------- | |
325 | * Transaction Management | |
326 | * -------------------------------------------------------------------------- */ | |
327 | ||
9887d22a LZ |
328 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
329 | { | |
330 | ec->reference_count++; | |
331 | if (ec->reference_count == 1) | |
332 | acpi_ec_enable_gpe(ec, true); | |
333 | } | |
334 | ||
335 | static void acpi_ec_complete_request(struct acpi_ec *ec) | |
336 | { | |
337 | bool flushed = false; | |
338 | ||
339 | ec->reference_count--; | |
340 | if (ec->reference_count == 0) | |
341 | acpi_ec_disable_gpe(ec, true); | |
342 | flushed = acpi_ec_flushed(ec); | |
343 | if (flushed) | |
344 | wake_up(&ec->wait); | |
345 | } | |
346 | ||
e1d4d90f LZ |
347 | static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) |
348 | { | |
349 | if (!test_bit(flag, &ec->flags)) { | |
350 | acpi_ec_disable_gpe(ec, false); | |
3535a3c1 | 351 | ec_dbg_drv("Polling enabled"); |
e1d4d90f LZ |
352 | set_bit(flag, &ec->flags); |
353 | } | |
354 | } | |
355 | ||
356 | static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) | |
357 | { | |
358 | if (test_bit(flag, &ec->flags)) { | |
359 | clear_bit(flag, &ec->flags); | |
360 | acpi_ec_enable_gpe(ec, false); | |
3535a3c1 | 361 | ec_dbg_drv("Polling disabled"); |
e1d4d90f LZ |
362 | } |
363 | } | |
364 | ||
9887d22a LZ |
365 | /* |
366 | * acpi_ec_submit_flushable_request() - Increase the reference count unless | |
367 | * the flush operation is not in | |
368 | * progress | |
369 | * @ec: the EC device | |
370 | * | |
371 | * This function must be used before taking a new action that should hold | |
372 | * the reference count. If this function returns false, then the action | |
373 | * must be discarded or it will prevent the flush operation from being | |
374 | * completed. | |
375 | */ | |
37d11391 | 376 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
9887d22a | 377 | { |
37d11391 RW |
378 | if (!acpi_ec_started(ec)) |
379 | return false; | |
9887d22a LZ |
380 | acpi_ec_submit_request(ec); |
381 | return true; | |
382 | } | |
383 | ||
37d11391 | 384 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
74443bbe | 385 | { |
37d11391 | 386 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
3535a3c1 | 387 | ec_dbg_req("Event started"); |
74443bbe LZ |
388 | schedule_work(&ec->work); |
389 | } | |
390 | } | |
391 | ||
37d11391 | 392 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
74443bbe LZ |
393 | { |
394 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { | |
37d11391 | 395 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
3535a3c1 | 396 | ec_dbg_req("Event stopped"); |
74443bbe LZ |
397 | } |
398 | } | |
399 | ||
d8d031a6 LZ |
400 | static int ec_transaction_polled(struct acpi_ec *ec) |
401 | { | |
402 | unsigned long flags; | |
403 | int ret = 0; | |
404 | ||
405 | spin_lock_irqsave(&ec->lock, flags); | |
406 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) | |
407 | ret = 1; | |
408 | spin_unlock_irqrestore(&ec->lock, flags); | |
409 | return ret; | |
410 | } | |
411 | ||
f92fca00 | 412 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 413 | { |
7c6db4e0 AS |
414 | unsigned long flags; |
415 | int ret = 0; | |
7a73e60e | 416 | |
f351d027 | 417 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 418 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 419 | ret = 1; |
f351d027 | 420 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 421 | return ret; |
45bea155 | 422 | } |
451566f4 | 423 | |
0c78808f | 424 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 425 | { |
36b15875 | 426 | struct transaction *t; |
66b42b78 | 427 | u8 status; |
c0d65341 | 428 | bool wakeup = false; |
b76b51ba | 429 | |
3535a3c1 LZ |
430 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
431 | smp_processor_id()); | |
ca37bfdf LZ |
432 | /* |
433 | * By always clearing STS before handling all indications, we can | |
434 | * ensure a hardware STS 0->1 change after this clearing can always | |
435 | * trigger a GPE interrupt. | |
436 | */ | |
437 | acpi_ec_clear_gpe(ec); | |
66b42b78 | 438 | status = acpi_ec_read_status(ec); |
36b15875 | 439 | t = ec->curr; |
b76b51ba | 440 | if (!t) |
f92fca00 LZ |
441 | goto err; |
442 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
443 | if (t->wlen > t->wi) { | |
444 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
445 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
446 | else | |
447 | goto err; | |
448 | } else if (t->rlen > t->ri) { | |
449 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
450 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 451 | if (t->rlen == t->ri) { |
f92fca00 | 452 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 453 | if (t->command == ACPI_EC_COMMAND_QUERY) |
3535a3c1 LZ |
454 | ec_dbg_req("Command(%s) hardware completion", |
455 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
456 | wakeup = true; |
457 | } | |
f92fca00 LZ |
458 | } else |
459 | goto err; | |
460 | } else if (t->wlen == t->wi && | |
c0d65341 | 461 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 462 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
463 | wakeup = true; |
464 | } | |
0c78808f | 465 | goto out; |
f92fca00 | 466 | } else { |
79149001 LZ |
467 | if (EC_FLAGS_QUERY_HANDSHAKE && |
468 | !(status & ACPI_EC_FLAG_SCI) && | |
3afcf2ec LZ |
469 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
470 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 471 | acpi_ec_complete_query(ec); |
3afcf2ec LZ |
472 | t->rdata[t->ri++] = 0x00; |
473 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
3535a3c1 LZ |
474 | ec_dbg_req("Command(%s) software completion", |
475 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
476 | wakeup = true; |
477 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
478 | acpi_ec_write_cmd(ec, t->command); |
479 | t->flags |= ACPI_EC_COMMAND_POLL; | |
37d11391 | 480 | acpi_ec_complete_query(ec); |
7c6db4e0 | 481 | } else |
dd15f8c4 | 482 | goto err; |
0c78808f | 483 | goto out; |
f92fca00 | 484 | } |
dd15f8c4 | 485 | err: |
a3cd8d27 FT |
486 | /* |
487 | * If SCI bit is set, then don't think it's a false IRQ | |
488 | * otherwise will take a not handled IRQ as a false one. | |
489 | */ | |
f92fca00 | 490 | if (!(status & ACPI_EC_FLAG_SCI)) { |
e1d4d90f LZ |
491 | if (in_interrupt() && t) { |
492 | if (t->irq_count < ec_storm_threshold) | |
493 | ++t->irq_count; | |
494 | /* Allow triggering on 0 threshold */ | |
495 | if (t->irq_count == ec_storm_threshold) | |
496 | acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); | |
497 | } | |
f92fca00 | 498 | } |
0c78808f | 499 | out: |
74443bbe | 500 | if (status & ACPI_EC_FLAG_SCI) |
37d11391 | 501 | acpi_ec_submit_query(ec); |
0c78808f LZ |
502 | if (wakeup && in_interrupt()) |
503 | wake_up(&ec->wait); | |
f92fca00 | 504 | } |
a3cd8d27 | 505 | |
f92fca00 LZ |
506 | static void start_transaction(struct acpi_ec *ec) |
507 | { | |
508 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
509 | ec->curr->flags = 0; | |
d8d031a6 LZ |
510 | } |
511 | ||
512 | static int ec_guard(struct acpi_ec *ec) | |
513 | { | |
15de603b | 514 | unsigned long guard = usecs_to_jiffies(ec_polling_guard); |
d8d031a6 LZ |
515 | unsigned long timeout = ec->timestamp + guard; |
516 | ||
517 | do { | |
15de603b | 518 | if (ec_busy_polling) { |
d8d031a6 LZ |
519 | /* Perform busy polling */ |
520 | if (ec_transaction_completed(ec)) | |
521 | return 0; | |
522 | udelay(jiffies_to_usecs(guard)); | |
523 | } else { | |
524 | /* | |
525 | * Perform wait polling | |
526 | * | |
527 | * The following check is there to keep the old | |
528 | * logic - no inter-transaction guarding for the | |
529 | * wait polling mode. | |
530 | */ | |
531 | if (!ec_transaction_polled(ec)) | |
532 | break; | |
533 | if (wait_event_timeout(ec->wait, | |
534 | ec_transaction_completed(ec), | |
535 | guard)) | |
536 | return 0; | |
537 | } | |
538 | /* Guard the register accesses for the polling modes */ | |
539 | } while (time_before(jiffies, timeout)); | |
540 | return -ETIME; | |
845625cd | 541 | } |
03d1d99c | 542 | |
7c6db4e0 AS |
543 | static int ec_poll(struct acpi_ec *ec) |
544 | { | |
2a84cb98 | 545 | unsigned long flags; |
28fe5c82 | 546 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 547 | |
2a84cb98 AS |
548 | while (repeat--) { |
549 | unsigned long delay = jiffies + | |
7a18e96d | 550 | msecs_to_jiffies(ec_delay); |
2a84cb98 | 551 | do { |
d8d031a6 LZ |
552 | if (!ec_guard(ec)) |
553 | return 0; | |
f92fca00 | 554 | spin_lock_irqsave(&ec->lock, flags); |
d8d031a6 | 555 | advance_transaction(ec); |
f92fca00 | 556 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 557 | } while (time_before(jiffies, delay)); |
16a26e85 | 558 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 559 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 560 | start_transaction(ec); |
f351d027 | 561 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 562 | } |
b77d81b2 | 563 | return -ETIME; |
1da177e4 LT |
564 | } |
565 | ||
8463200a | 566 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 567 | struct transaction *t) |
45bea155 | 568 | { |
7c6db4e0 | 569 | unsigned long tmp; |
7c6db4e0 | 570 | int ret = 0; |
7a73e60e | 571 | |
7c6db4e0 | 572 | /* start transaction */ |
f351d027 | 573 | spin_lock_irqsave(&ec->lock, tmp); |
9887d22a | 574 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
37d11391 | 575 | if (!acpi_ec_submit_flushable_request(ec)) { |
ad479e7f LZ |
576 | ret = -EINVAL; |
577 | goto unlock; | |
578 | } | |
770970f0 | 579 | ec_dbg_ref(ec, "Increase command"); |
7c6db4e0 | 580 | /* following two actions should be kept atomic */ |
8463200a | 581 | ec->curr = t; |
3535a3c1 | 582 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
a2f93aea | 583 | start_transaction(ec); |
df9ff918 | 584 | spin_unlock_irqrestore(&ec->lock, tmp); |
d8d031a6 | 585 | |
df9ff918 | 586 | ret = ec_poll(ec); |
d8d031a6 | 587 | |
df9ff918 | 588 | spin_lock_irqsave(&ec->lock, tmp); |
e1d4d90f LZ |
589 | if (t->irq_count == ec_storm_threshold) |
590 | acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); | |
3535a3c1 | 591 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
8463200a | 592 | ec->curr = NULL; |
9887d22a LZ |
593 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
594 | acpi_ec_complete_request(ec); | |
770970f0 | 595 | ec_dbg_ref(ec, "Decrease command"); |
ad479e7f | 596 | unlock: |
f351d027 | 597 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
598 | return ret; |
599 | } | |
600 | ||
2a84cb98 | 601 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 602 | { |
d7a76e4c | 603 | int status; |
50526df6 | 604 | u32 glk; |
7a73e60e | 605 | |
8463200a | 606 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 607 | return -EINVAL; |
8463200a AS |
608 | if (t->rdata) |
609 | memset(t->rdata, 0, t->rlen); | |
d8d031a6 | 610 | |
f351d027 | 611 | mutex_lock(&ec->mutex); |
703959d4 | 612 | if (ec->global_lock) { |
1da177e4 | 613 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 614 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
615 | status = -ENODEV; |
616 | goto unlock; | |
c24e912b | 617 | } |
1da177e4 | 618 | } |
a62e8f19 | 619 | |
2a84cb98 | 620 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 | 621 | |
703959d4 | 622 | if (ec->global_lock) |
1da177e4 | 623 | acpi_release_global_lock(glk); |
7c6db4e0 | 624 | unlock: |
f351d027 | 625 | mutex_unlock(&ec->mutex); |
d550d98d | 626 | return status; |
1da177e4 LT |
627 | } |
628 | ||
8a383ef0 | 629 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
630 | { |
631 | u8 d; | |
8463200a AS |
632 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
633 | .wdata = NULL, .rdata = &d, | |
634 | .wlen = 0, .rlen = 1}; | |
635 | ||
2a84cb98 | 636 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
637 | } |
638 | ||
8a383ef0 | 639 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 640 | { |
8463200a AS |
641 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
642 | .wdata = NULL, .rdata = NULL, | |
643 | .wlen = 0, .rlen = 0}; | |
644 | ||
7c6db4e0 | 645 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 646 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
647 | } |
648 | ||
7a73e60e | 649 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
650 | { |
651 | int result; | |
652 | u8 d; | |
8463200a AS |
653 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
654 | .wdata = &address, .rdata = &d, | |
655 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 656 | |
2a84cb98 | 657 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
658 | *data = d; |
659 | return result; | |
660 | } | |
6ffb221a | 661 | |
3576cf61 DS |
662 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
663 | { | |
6ccedb10 | 664 | u8 wdata[2] = { address, data }; |
8463200a AS |
665 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
666 | .wdata = wdata, .rdata = NULL, | |
667 | .wlen = 2, .rlen = 0}; | |
668 | ||
2a84cb98 | 669 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
670 | } |
671 | ||
b76b51ba | 672 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 673 | { |
1da177e4 | 674 | int err; |
6ffb221a | 675 | u8 temp_data; |
1da177e4 LT |
676 | |
677 | if (!first_ec) | |
678 | return -ENODEV; | |
679 | ||
d033879c | 680 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
681 | |
682 | if (!err) { | |
683 | *val = temp_data; | |
684 | return 0; | |
7a73e60e LZ |
685 | } |
686 | return err; | |
1da177e4 LT |
687 | } |
688 | EXPORT_SYMBOL(ec_read); | |
689 | ||
50526df6 | 690 | int ec_write(u8 addr, u8 val) |
1da177e4 | 691 | { |
1da177e4 LT |
692 | int err; |
693 | ||
694 | if (!first_ec) | |
695 | return -ENODEV; | |
696 | ||
d033879c | 697 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
698 | |
699 | return err; | |
700 | } | |
701 | EXPORT_SYMBOL(ec_write); | |
702 | ||
616362de | 703 | int ec_transaction(u8 command, |
7a73e60e LZ |
704 | const u8 *wdata, unsigned wdata_len, |
705 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 706 | { |
8463200a AS |
707 | struct transaction t = {.command = command, |
708 | .wdata = wdata, .rdata = rdata, | |
709 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 710 | |
d7a76e4c LP |
711 | if (!first_ec) |
712 | return -ENODEV; | |
45bea155 | 713 | |
2a84cb98 | 714 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 715 | } |
ab9e43c6 LP |
716 | EXPORT_SYMBOL(ec_transaction); |
717 | ||
3e2abc5a SF |
718 | /* Get the handle to the EC device */ |
719 | acpi_handle ec_get_handle(void) | |
720 | { | |
721 | if (!first_ec) | |
722 | return NULL; | |
723 | return first_ec->handle; | |
724 | } | |
3e2abc5a SF |
725 | EXPORT_SYMBOL(ec_get_handle); |
726 | ||
ad332c8a | 727 | /* |
3eba563e | 728 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
729 | * Run with locked ec mutex. |
730 | */ | |
731 | static void acpi_ec_clear(struct acpi_ec *ec) | |
732 | { | |
733 | int i, status; | |
734 | u8 value = 0; | |
735 | ||
736 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
550b3aac | 737 | status = acpi_ec_query(ec, &value); |
ad332c8a KC |
738 | if (status || !value) |
739 | break; | |
740 | } | |
741 | ||
742 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
743 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
744 | else | |
745 | pr_info("%d stale EC events cleared\n", i); | |
746 | } | |
747 | ||
ad479e7f LZ |
748 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
749 | { | |
750 | unsigned long flags; | |
751 | ||
752 | spin_lock_irqsave(&ec->lock, flags); | |
753 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { | |
3535a3c1 | 754 | ec_dbg_drv("Starting EC"); |
9887d22a | 755 | /* Enable GPE for event processing (SCI_EVT=1) */ |
770970f0 | 756 | if (!resuming) { |
9887d22a | 757 | acpi_ec_submit_request(ec); |
770970f0 LZ |
758 | ec_dbg_ref(ec, "Increase driver"); |
759 | } | |
3535a3c1 | 760 | ec_log_drv("EC started"); |
ad479e7f LZ |
761 | } |
762 | spin_unlock_irqrestore(&ec->lock, flags); | |
763 | } | |
764 | ||
9887d22a LZ |
765 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
766 | { | |
767 | unsigned long flags; | |
768 | bool flushed; | |
769 | ||
770 | spin_lock_irqsave(&ec->lock, flags); | |
771 | flushed = acpi_ec_flushed(ec); | |
772 | spin_unlock_irqrestore(&ec->lock, flags); | |
773 | return flushed; | |
774 | } | |
775 | ||
ad479e7f LZ |
776 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
777 | { | |
778 | unsigned long flags; | |
779 | ||
780 | spin_lock_irqsave(&ec->lock, flags); | |
781 | if (acpi_ec_started(ec)) { | |
3535a3c1 | 782 | ec_dbg_drv("Stopping EC"); |
ad479e7f | 783 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
9887d22a LZ |
784 | spin_unlock_irqrestore(&ec->lock, flags); |
785 | wait_event(ec->wait, acpi_ec_stopped(ec)); | |
786 | spin_lock_irqsave(&ec->lock, flags); | |
787 | /* Disable GPE for event processing (SCI_EVT=1) */ | |
770970f0 | 788 | if (!suspending) { |
9887d22a | 789 | acpi_ec_complete_request(ec); |
770970f0 LZ |
790 | ec_dbg_ref(ec, "Decrease driver"); |
791 | } | |
ad479e7f LZ |
792 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
793 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); | |
3535a3c1 | 794 | ec_log_drv("EC stopped"); |
ad479e7f LZ |
795 | } |
796 | spin_unlock_irqrestore(&ec->lock, flags); | |
797 | } | |
798 | ||
fe955682 | 799 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
800 | { |
801 | struct acpi_ec *ec = first_ec; | |
802 | ||
803 | if (!ec) | |
804 | return; | |
805 | ||
f351d027 | 806 | mutex_lock(&ec->mutex); |
f6bb13aa | 807 | /* Prevent transactions from being carried out */ |
ad479e7f | 808 | acpi_ec_stop(ec, true); |
f351d027 | 809 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
810 | } |
811 | ||
fe955682 | 812 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
813 | { |
814 | struct acpi_ec *ec = first_ec; | |
815 | ||
816 | if (!ec) | |
817 | return; | |
818 | ||
f6bb13aa | 819 | /* Allow transactions to be carried out again */ |
ad479e7f | 820 | acpi_ec_start(ec, true); |
ad332c8a KC |
821 | |
822 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
823 | acpi_ec_clear(ec); | |
f6bb13aa RW |
824 | } |
825 | ||
fe955682 | 826 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
827 | { |
828 | /* | |
829 | * Allow transactions to happen again (this function is called from | |
830 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
831 | */ | |
832 | if (first_ec) | |
ad479e7f | 833 | acpi_ec_start(first_ec, true); |
d5a64513 RW |
834 | } |
835 | ||
1da177e4 LT |
836 | /* -------------------------------------------------------------------------- |
837 | Event Management | |
838 | -------------------------------------------------------------------------- */ | |
01305d41 LZ |
839 | static struct acpi_ec_query_handler * |
840 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) | |
841 | { | |
842 | if (handler) | |
843 | kref_get(&handler->kref); | |
844 | return handler; | |
845 | } | |
846 | ||
847 | static void acpi_ec_query_handler_release(struct kref *kref) | |
848 | { | |
849 | struct acpi_ec_query_handler *handler = | |
850 | container_of(kref, struct acpi_ec_query_handler, kref); | |
851 | ||
852 | kfree(handler); | |
853 | } | |
854 | ||
855 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) | |
856 | { | |
857 | kref_put(&handler->kref, acpi_ec_query_handler_release); | |
858 | } | |
859 | ||
837012ed AS |
860 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
861 | acpi_handle handle, acpi_ec_query_func func, | |
862 | void *data) | |
863 | { | |
864 | struct acpi_ec_query_handler *handler = | |
865 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 866 | |
837012ed AS |
867 | if (!handler) |
868 | return -ENOMEM; | |
869 | ||
870 | handler->query_bit = query_bit; | |
871 | handler->handle = handle; | |
872 | handler->func = func; | |
873 | handler->data = data; | |
f351d027 | 874 | mutex_lock(&ec->mutex); |
01305d41 | 875 | kref_init(&handler->kref); |
30c08574 | 876 | list_add(&handler->node, &ec->list); |
f351d027 | 877 | mutex_unlock(&ec->mutex); |
837012ed AS |
878 | return 0; |
879 | } | |
837012ed AS |
880 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
881 | ||
882 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
883 | { | |
1544fdbc | 884 | struct acpi_ec_query_handler *handler, *tmp; |
01305d41 | 885 | LIST_HEAD(free_list); |
7a73e60e | 886 | |
f351d027 | 887 | mutex_lock(&ec->mutex); |
1544fdbc | 888 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed | 889 | if (query_bit == handler->query_bit) { |
01305d41 LZ |
890 | list_del_init(&handler->node); |
891 | list_add(&handler->node, &free_list); | |
837012ed AS |
892 | } |
893 | } | |
f351d027 | 894 | mutex_unlock(&ec->mutex); |
6b5eab54 | 895 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
01305d41 | 896 | acpi_ec_put_query_handler(handler); |
837012ed | 897 | } |
837012ed | 898 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 899 | |
a62e8f19 | 900 | static void acpi_ec_run(void *cxt) |
45bea155 | 901 | { |
a62e8f19 | 902 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 903 | |
a62e8f19 | 904 | if (!handler) |
e41334c0 | 905 | return; |
3535a3c1 | 906 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
a62e8f19 AS |
907 | if (handler->func) |
908 | handler->func(handler->data); | |
909 | else if (handler->handle) | |
910 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
3535a3c1 | 911 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
01305d41 | 912 | acpi_ec_put_query_handler(handler); |
a62e8f19 AS |
913 | } |
914 | ||
550b3aac | 915 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
916 | { |
917 | u8 value = 0; | |
c2cf5769 LZ |
918 | int result; |
919 | acpi_status status; | |
01305d41 | 920 | struct acpi_ec_query_handler *handler; |
550b3aac LZ |
921 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
922 | .wdata = NULL, .rdata = &value, | |
923 | .wlen = 0, .rlen = 1}; | |
3eba563e | 924 | |
550b3aac LZ |
925 | /* |
926 | * Query the EC to find out which _Qxx method we need to evaluate. | |
927 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
928 | * bit to be cleared (and thus clearing the interrupt source). | |
929 | */ | |
930 | result = acpi_ec_transaction(ec, &t); | |
c2cf5769 LZ |
931 | if (result) |
932 | return result; | |
550b3aac LZ |
933 | if (data) |
934 | *data = value; | |
935 | if (!value) | |
936 | return -ENODATA; | |
3eba563e | 937 | |
550b3aac | 938 | mutex_lock(&ec->mutex); |
837012ed AS |
939 | list_for_each_entry(handler, &ec->list, node) { |
940 | if (value == handler->query_bit) { | |
941 | /* have custom handler for this bit */ | |
01305d41 | 942 | handler = acpi_ec_get_query_handler(handler); |
3535a3c1 LZ |
943 | ec_dbg_evt("Query(0x%02x) scheduled", |
944 | handler->query_bit); | |
c2cf5769 | 945 | status = acpi_os_execute((handler->func) ? |
f5347867 | 946 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, |
01305d41 | 947 | acpi_ec_run, handler); |
c2cf5769 LZ |
948 | if (ACPI_FAILURE(status)) |
949 | result = -EBUSY; | |
950 | break; | |
837012ed AS |
951 | } |
952 | } | |
550b3aac | 953 | mutex_unlock(&ec->mutex); |
c2cf5769 | 954 | return result; |
a62e8f19 AS |
955 | } |
956 | ||
74443bbe | 957 | static void acpi_ec_gpe_poller(struct work_struct *work) |
a62e8f19 | 958 | { |
74443bbe | 959 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
7a73e60e | 960 | |
550b3aac | 961 | acpi_ec_query(ec, NULL); |
45bea155 | 962 | } |
1da177e4 | 963 | |
8b6cd8ad LM |
964 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
965 | u32 gpe_number, void *data) | |
1da177e4 | 966 | { |
f92fca00 | 967 | unsigned long flags; |
3d02b90b | 968 | struct acpi_ec *ec = data; |
7c6db4e0 | 969 | |
f92fca00 | 970 | spin_lock_irqsave(&ec->lock, flags); |
0c78808f | 971 | advance_transaction(ec); |
c0d65341 | 972 | spin_unlock_irqrestore(&ec->lock, flags); |
ca37bfdf | 973 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
974 | } |
975 | ||
1da177e4 | 976 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
977 | * Address Space Management |
978 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 979 | |
1da177e4 | 980 | static acpi_status |
5b7734b4 | 981 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 982 | u32 bits, u64 *value64, |
50526df6 | 983 | void *handler_context, void *region_context) |
1da177e4 | 984 | { |
3d02b90b | 985 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
986 | int result = 0, i, bytes = bits / 8; |
987 | u8 *value = (u8 *)value64; | |
1da177e4 | 988 | |
1da177e4 | 989 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 990 | return AE_BAD_PARAMETER; |
1da177e4 | 991 | |
5b7734b4 | 992 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 993 | return AE_BAD_PARAMETER; |
1da177e4 | 994 | |
15de603b | 995 | if (ec_busy_polling || bits > 8) |
6a63b06f | 996 | acpi_ec_burst_enable(ec); |
b3b233c7 | 997 | |
dadf28a1 AS |
998 | for (i = 0; i < bytes; ++i, ++address, ++value) |
999 | result = (function == ACPI_READ) ? | |
1000 | acpi_ec_read(ec, address, value) : | |
1001 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 1002 | |
15de603b | 1003 | if (ec_busy_polling || bits > 8) |
6a63b06f | 1004 | acpi_ec_burst_disable(ec); |
b3b233c7 | 1005 | |
1da177e4 LT |
1006 | switch (result) { |
1007 | case -EINVAL: | |
d550d98d | 1008 | return AE_BAD_PARAMETER; |
1da177e4 | 1009 | case -ENODEV: |
d550d98d | 1010 | return AE_NOT_FOUND; |
1da177e4 | 1011 | case -ETIME: |
d550d98d | 1012 | return AE_TIME; |
1da177e4 | 1013 | default: |
d550d98d | 1014 | return AE_OK; |
1da177e4 | 1015 | } |
1da177e4 LT |
1016 | } |
1017 | ||
1da177e4 | 1018 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
1019 | * Driver Interface |
1020 | * -------------------------------------------------------------------------- */ | |
1021 | ||
c0900c35 AS |
1022 | static acpi_status |
1023 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
1024 | ||
c0900c35 AS |
1025 | static struct acpi_ec *make_acpi_ec(void) |
1026 | { | |
1027 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 1028 | |
c0900c35 AS |
1029 | if (!ec) |
1030 | return NULL; | |
37d11391 | 1031 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 1032 | mutex_init(&ec->mutex); |
c0900c35 | 1033 | init_waitqueue_head(&ec->wait); |
837012ed | 1034 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 1035 | spin_lock_init(&ec->lock); |
74443bbe | 1036 | INIT_WORK(&ec->work, acpi_ec_gpe_poller); |
d8d031a6 | 1037 | ec->timestamp = jiffies; |
c0900c35 AS |
1038 | return ec; |
1039 | } | |
837012ed | 1040 | |
c019b193 AS |
1041 | static acpi_status |
1042 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
1043 | void *context, void **return_value) | |
1044 | { | |
0175d562 LM |
1045 | char node_name[5]; |
1046 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
1047 | struct acpi_ec *ec = context; |
1048 | int value = 0; | |
0175d562 LM |
1049 | acpi_status status; |
1050 | ||
1051 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
1052 | ||
7a73e60e | 1053 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 1054 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
1055 | return AE_OK; |
1056 | } | |
1057 | ||
cd8c93a4 AS |
1058 | static acpi_status |
1059 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 1060 | { |
cd8c93a4 | 1061 | acpi_status status; |
d21cf3c1 | 1062 | unsigned long long tmp = 0; |
cd8c93a4 | 1063 | struct acpi_ec *ec = context; |
a5032bfd AS |
1064 | |
1065 | /* clear addr values, ec_parse_io_ports depend on it */ | |
1066 | ec->command_addr = ec->data_addr = 0; | |
1067 | ||
cd8c93a4 AS |
1068 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
1069 | ec_parse_io_ports, ec); | |
1070 | if (ACPI_FAILURE(status)) | |
1071 | return status; | |
837012ed AS |
1072 | |
1073 | /* Get GPE bit assignment (EC events). */ | |
1074 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 1075 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
1076 | if (ACPI_FAILURE(status)) |
1077 | return status; | |
27663c58 | 1078 | ec->gpe = tmp; |
837012ed | 1079 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 1080 | tmp = 0; |
27663c58 MW |
1081 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
1082 | ec->global_lock = tmp; | |
837012ed | 1083 | ec->handle = handle; |
cd8c93a4 | 1084 | return AE_CTRL_TERMINATE; |
837012ed AS |
1085 | } |
1086 | ||
5efc5476 BH |
1087 | static int ec_install_handlers(struct acpi_ec *ec) |
1088 | { | |
1089 | acpi_status status; | |
7a73e60e | 1090 | |
5efc5476 BH |
1091 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1092 | return 0; | |
ca37bfdf | 1093 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
5efc5476 BH |
1094 | ACPI_GPE_EDGE_TRIGGERED, |
1095 | &acpi_ec_gpe_handler, ec); | |
1096 | if (ACPI_FAILURE(status)) | |
1097 | return -ENODEV; | |
9630bdd9 | 1098 | |
ad479e7f | 1099 | acpi_ec_start(ec, false); |
5efc5476 BH |
1100 | status = acpi_install_address_space_handler(ec->handle, |
1101 | ACPI_ADR_SPACE_EC, | |
1102 | &acpi_ec_space_handler, | |
1103 | NULL, ec); | |
1104 | if (ACPI_FAILURE(status)) { | |
1105 | if (status == AE_NOT_FOUND) { | |
1106 | /* | |
1107 | * Maybe OS fails in evaluating the _REG object. | |
1108 | * The AE_NOT_FOUND error will be ignored and OS | |
1109 | * continue to initialize EC. | |
1110 | */ | |
16a26e85 | 1111 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
1112 | " of EC device. Broken bios is suspected.\n"); |
1113 | } else { | |
ad479e7f | 1114 | acpi_ec_stop(ec, false); |
5efc5476 BH |
1115 | acpi_remove_gpe_handler(NULL, ec->gpe, |
1116 | &acpi_ec_gpe_handler); | |
1117 | return -ENODEV; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
1122 | return 0; | |
1123 | } | |
1124 | ||
4c611060 AS |
1125 | static void ec_remove_handlers(struct acpi_ec *ec) |
1126 | { | |
1741acea LZ |
1127 | if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
1128 | return; | |
ad479e7f | 1129 | acpi_ec_stop(ec, false); |
4c611060 AS |
1130 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
1131 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 1132 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
1133 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
1134 | &acpi_ec_gpe_handler))) | |
16a26e85 | 1135 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 1136 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
1137 | } |
1138 | ||
703959d4 | 1139 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 1140 | { |
703959d4 | 1141 | struct acpi_ec *ec = NULL; |
d02be047 | 1142 | int ret; |
45bea155 | 1143 | |
c0900c35 AS |
1144 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1145 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1146 | ||
4c611060 | 1147 | /* Check for boot EC */ |
ce52ddf5 AS |
1148 | if (boot_ec && |
1149 | (boot_ec->handle == device->handle || | |
1150 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
1151 | ec = boot_ec; | |
1152 | boot_ec = NULL; | |
1153 | } else { | |
1154 | ec = make_acpi_ec(); | |
1155 | if (!ec) | |
1156 | return -ENOMEM; | |
a5032bfd AS |
1157 | } |
1158 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
1159 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
1160 | kfree(ec); |
1161 | return -EINVAL; | |
4c611060 AS |
1162 | } |
1163 | ||
ce52ddf5 AS |
1164 | /* Find and register all query methods */ |
1165 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 1166 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 1167 | |
4c611060 AS |
1168 | if (!first_ec) |
1169 | first_ec = ec; | |
db89b4f0 | 1170 | device->driver_data = ec; |
de4f1046 | 1171 | |
d6795fe3 AK |
1172 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
1173 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
1174 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
1175 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 1176 | |
16a26e85 | 1177 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 1178 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
1179 | |
1180 | ret = ec_install_handlers(ec); | |
1181 | ||
1c832b3e LT |
1182 | /* Reprobe devices depending on the EC */ |
1183 | acpi_walk_dep_device_list(ec->handle); | |
1184 | ||
5efc5476 | 1185 | /* EC is fully operational, allow queries */ |
37d11391 | 1186 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
ad332c8a KC |
1187 | |
1188 | /* Clear stale _Q events if hardware might require that */ | |
550b3aac | 1189 | if (EC_FLAGS_CLEAR_ON_RESUME) |
ad332c8a | 1190 | acpi_ec_clear(ec); |
5efc5476 | 1191 | return ret; |
1da177e4 LT |
1192 | } |
1193 | ||
51fac838 | 1194 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 1195 | { |
01f22462 | 1196 | struct acpi_ec *ec; |
07ddf768 | 1197 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 1198 | |
1da177e4 | 1199 | if (!device) |
d550d98d | 1200 | return -EINVAL; |
1da177e4 LT |
1201 | |
1202 | ec = acpi_driver_data(device); | |
cf745ec7 | 1203 | ec_remove_handlers(ec); |
f351d027 | 1204 | mutex_lock(&ec->mutex); |
07ddf768 | 1205 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
1206 | list_del(&handler->node); |
1207 | kfree(handler); | |
1208 | } | |
f351d027 | 1209 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
1210 | release_region(ec->data_addr, 1); |
1211 | release_region(ec->command_addr, 1); | |
db89b4f0 | 1212 | device->driver_data = NULL; |
d033879c | 1213 | if (ec == first_ec) |
c0900c35 | 1214 | first_ec = NULL; |
4c611060 | 1215 | kfree(ec); |
d550d98d | 1216 | return 0; |
1da177e4 LT |
1217 | } |
1218 | ||
1da177e4 | 1219 | static acpi_status |
c0900c35 | 1220 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1221 | { |
3d02b90b | 1222 | struct acpi_ec *ec = context; |
1da177e4 | 1223 | |
01f22462 | 1224 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 1225 | return AE_OK; |
1da177e4 LT |
1226 | |
1227 | /* | |
1228 | * The first address region returned is the data port, and | |
1229 | * the second address region returned is the status/command | |
1230 | * port. | |
1231 | */ | |
de4f1046 | 1232 | if (ec->data_addr == 0) |
6ffb221a | 1233 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 1234 | else if (ec->command_addr == 0) |
6ffb221a | 1235 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 1236 | else |
1da177e4 | 1237 | return AE_CTRL_TERMINATE; |
1da177e4 | 1238 | |
1da177e4 LT |
1239 | return AE_OK; |
1240 | } | |
1241 | ||
c04209a7 AS |
1242 | int __init acpi_boot_ec_enable(void) |
1243 | { | |
7c6db4e0 | 1244 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
1245 | return 0; |
1246 | if (!ec_install_handlers(boot_ec)) { | |
1247 | first_ec = boot_ec; | |
1248 | return 0; | |
1249 | } | |
1250 | return -EFAULT; | |
1251 | } | |
1252 | ||
223883b7 AS |
1253 | static const struct acpi_device_id ec_device_ids[] = { |
1254 | {"PNP0C09", 0}, | |
1255 | {"", 0}, | |
1256 | }; | |
1257 | ||
478fa03b AS |
1258 | /* Some BIOS do not survive early DSDT scan, skip it */ |
1259 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
1260 | { | |
1261 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
0adf3c74 AS |
1265 | /* ASUStek often supplies us with broken ECDT, validate it */ |
1266 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
1267 | { | |
1268 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1269 | return 0; | |
1270 | } | |
1271 | ||
15de603b LZ |
1272 | /* EC firmware needs special polling mode, enable it */ |
1273 | static int ec_use_busy_polling(const struct dmi_system_id *id) | |
0adf3c74 | 1274 | { |
15de603b LZ |
1275 | pr_debug("Detected the EC firmware requiring busy polling mode.\n"); |
1276 | ec_busy_polling = 1; | |
0adf3c74 AS |
1277 | EC_FLAGS_VALIDATE_ECDT = 1; |
1278 | return 0; | |
1279 | } | |
1280 | ||
79149001 LZ |
1281 | /* |
1282 | * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for | |
1283 | * which case, we complete the QR_EC without issuing it to the firmware. | |
1284 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
1285 | */ | |
1286 | static int ec_flag_query_handshake(const struct dmi_system_id *id) | |
1287 | { | |
1288 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); | |
1289 | EC_FLAGS_QUERY_HANDSHAKE = 1; | |
1290 | return 0; | |
1291 | } | |
1292 | ||
ad332c8a KC |
1293 | /* |
1294 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1295 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1296 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1297 | * | |
1298 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1299 | * | |
1300 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1301 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1302 | * behaviour is not known at this time. | |
1303 | * | |
1304 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1305 | * however it is very likely that other Samsung models are affected. | |
1306 | * | |
1307 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1308 | * should be harmless. | |
1309 | */ | |
1310 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1311 | { | |
1312 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1313 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1314 | return 0; | |
1315 | } | |
1316 | ||
6cef7497 | 1317 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1318 | { |
1319 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1320 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1321 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 | 1322 | { |
15de603b | 1323 | ec_use_busy_polling, "MSI hardware", { |
55b313f2 AS |
1324 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1325 | { | |
15de603b | 1326 | ec_use_busy_polling, "MSI hardware", { |
55b313f2 AS |
1327 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, |
1328 | { | |
15de603b | 1329 | ec_use_busy_polling, "MSI hardware", { |
55b313f2 | 1330 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, |
0adf3c74 | 1331 | { |
15de603b | 1332 | ec_use_busy_polling, "MSI hardware", { |
a5dc4f89 AS |
1333 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, |
1334 | { | |
15de603b | 1335 | ec_use_busy_polling, "Quanta hardware", { |
534bc4e3 ZR |
1336 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), |
1337 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1338 | { | |
15de603b | 1339 | ec_use_busy_polling, "Quanta hardware", { |
534bc4e3 ZR |
1340 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), |
1341 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1342 | { | |
15de603b | 1343 | ec_use_busy_polling, "Clevo W350etq", { |
777cb382 LT |
1344 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), |
1345 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1346 | { | |
0adf3c74 AS |
1347 | ec_validate_ecdt, "ASUS hardware", { |
1348 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1349 | { |
1350 | ec_validate_ecdt, "ASUS hardware", { | |
1351 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 | 1352 | { |
eff9a4b6 LT |
1353 | ec_skip_dsdt_scan, "HP Folio 13", { |
1354 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1355 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1356 | { |
1357 | ec_validate_ecdt, "ASUS hardware", { | |
1358 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1359 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1360 | { |
1361 | ec_clear_on_resume, "Samsung hardware", { | |
1362 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
79149001 LZ |
1363 | { |
1364 | ec_flag_query_handshake, "Acer hardware", { | |
1365 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL}, | |
0adf3c74 AS |
1366 | {}, |
1367 | }; | |
1368 | ||
c0900c35 AS |
1369 | int __init acpi_ec_ecdt_probe(void) |
1370 | { | |
c0900c35 | 1371 | acpi_status status; |
c6cb0e87 | 1372 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1373 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1374 | |
d66d969d AS |
1375 | boot_ec = make_acpi_ec(); |
1376 | if (!boot_ec) | |
c0900c35 AS |
1377 | return -ENOMEM; |
1378 | /* | |
1379 | * Generate a boot ec context | |
1380 | */ | |
0adf3c74 | 1381 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1382 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1383 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1384 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1385 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1386 | boot_ec->command_addr = ecdt_ptr->control.address; |
1387 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1388 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1389 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1390 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1391 | &boot_ec->handle); | |
c6cb0e87 | 1392 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1393 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1394 | goto install; |
d6bd535d | 1395 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1396 | if (!saved_ec) |
1397 | return -ENOMEM; | |
c5279dee | 1398 | /* fall through */ |
cd8c93a4 | 1399 | } |
0adf3c74 | 1400 | |
ed4b197d CIK |
1401 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1402 | kfree(saved_ec); | |
478fa03b | 1403 | return -ENODEV; |
ed4b197d | 1404 | } |
478fa03b | 1405 | |
c5279dee AS |
1406 | /* This workaround is needed only on some broken machines, |
1407 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1408 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1409 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1410 | boot_ec, NULL); | |
1411 | /* Check that acpi_get_devices actually find something */ | |
1412 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1413 | goto error; | |
c6cb0e87 AS |
1414 | if (saved_ec) { |
1415 | /* try to find good ECDT from ASUSTek */ | |
1416 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1417 | saved_ec->data_addr != boot_ec->data_addr || | |
1418 | saved_ec->gpe != boot_ec->gpe || | |
1419 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1420 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1421 | "ECDT tables, which are very hard to workaround. " |
1422 | "Trying to use DSDT EC info instead. Please send " | |
1423 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1424 | kfree(saved_ec); | |
1425 | saved_ec = NULL; | |
1426 | } else { | |
1427 | /* We really need to limit this workaround, the only ASUS, | |
1428 | * which needs it, has fake EC._INI method, so use it as flag. | |
1429 | * Keep boot_ec struct as it will be needed soon. | |
1430 | */ | |
c6cb0e87 | 1431 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1432 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1433 | return -ENODEV; |
1434 | } | |
c5279dee AS |
1435 | install: |
1436 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1437 | first_ec = boot_ec; |
e8284321 | 1438 | return 0; |
d033879c | 1439 | } |
c5279dee | 1440 | error: |
d66d969d | 1441 | kfree(boot_ec); |
ed4b197d | 1442 | kfree(saved_ec); |
d66d969d | 1443 | boot_ec = NULL; |
1da177e4 LT |
1444 | return -ENODEV; |
1445 | } | |
1446 | ||
223883b7 AS |
1447 | static struct acpi_driver acpi_ec_driver = { |
1448 | .name = "ec", | |
1449 | .class = ACPI_EC_CLASS, | |
1450 | .ids = ec_device_ids, | |
1451 | .ops = { | |
1452 | .add = acpi_ec_add, | |
1453 | .remove = acpi_ec_remove, | |
223883b7 AS |
1454 | }, |
1455 | }; | |
1456 | ||
a5f820fe | 1457 | int __init acpi_ec_init(void) |
1da177e4 | 1458 | { |
50526df6 | 1459 | int result = 0; |
1da177e4 | 1460 | |
1da177e4 LT |
1461 | /* Now register the driver for the EC */ |
1462 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1463 | if (result < 0) |
d550d98d | 1464 | return -ENODEV; |
1da177e4 | 1465 | |
d550d98d | 1466 | return result; |
1da177e4 LT |
1467 | } |
1468 | ||
1da177e4 LT |
1469 | /* EC driver currently not unloadable */ |
1470 | #if 0 | |
50526df6 | 1471 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1472 | { |
1da177e4 LT |
1473 | |
1474 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1475 | } |
7843932a | 1476 | #endif /* 0 */ |