Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7c6db4e0 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.1) |
1da177e4 | 3 | * |
7c6db4e0 | 4 | * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
01f22462 | 5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
1da177e4 LT |
6 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
7 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
8 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
7c6db4e0 | 29 | /* Uncomment next line to get verbose printout */ |
d772b3b3 MN |
30 | /* #define DEBUG */ |
31 | ||
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/delay.h> | |
451566f4 | 37 | #include <linux/interrupt.h> |
837012ed | 38 | #include <linux/list.h> |
7c6db4e0 | 39 | #include <linux/spinlock.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/acpi_drivers.h> | |
eb27cae8 | 44 | #include <linux/dmi.h> |
1da177e4 | 45 | |
1195a098 TR |
46 | #include "internal.h" |
47 | ||
1da177e4 | 48 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
49 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
50 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 51 | |
1195a098 | 52 | #undef PREFIX |
af3fd140 | 53 | #define PREFIX "ACPI: EC: " |
4350933a | 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 */ | |
451566f4 | 58 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 59 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 60 | |
703959d4 | 61 | /* EC commands */ |
3261ff4d | 62 | enum ec_command { |
6ccedb10 AS |
63 | ACPI_EC_COMMAND_READ = 0x80, |
64 | ACPI_EC_COMMAND_WRITE = 0x81, | |
65 | ACPI_EC_BURST_ENABLE = 0x82, | |
66 | ACPI_EC_BURST_DISABLE = 0x83, | |
67 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 68 | }; |
837012ed | 69 | |
5c406412 | 70 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 71 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
34ff4dbc | 72 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
2a84cb98 | 73 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 74 | |
06cf7d3c | 75 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
76 | per one transaction */ |
77 | ||
080e412c | 78 | enum { |
080e412c | 79 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 80 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 81 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 82 | * OpReg are installed */ |
fe955682 | 83 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 84 | }; |
6ffb221a DS |
85 | |
86 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 87 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
88 | typedef int (*acpi_ec_query_func) (void *data); |
89 | ||
90 | struct acpi_ec_query_handler { | |
91 | struct list_head node; | |
92 | acpi_ec_query_func func; | |
93 | acpi_handle handle; | |
94 | void *data; | |
95 | u8 query_bit; | |
96 | }; | |
97 | ||
8463200a | 98 | struct transaction { |
7c6db4e0 AS |
99 | const u8 *wdata; |
100 | u8 *rdata; | |
101 | unsigned short irq_count; | |
8463200a | 102 | u8 command; |
a2f93aea AS |
103 | u8 wi; |
104 | u8 ri; | |
7c6db4e0 AS |
105 | u8 wlen; |
106 | u8 rlen; | |
dd15f8c4 | 107 | bool done; |
7c6db4e0 AS |
108 | }; |
109 | ||
1195a098 TR |
110 | struct acpi_ec *boot_ec, *first_ec; |
111 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 112 | |
5423a0cb | 113 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 114 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 115 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 116 | |
1da177e4 LT |
117 | /* -------------------------------------------------------------------------- |
118 | Transaction Management | |
119 | -------------------------------------------------------------------------- */ | |
120 | ||
6ffb221a | 121 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 122 | { |
3ebe08a7 | 123 | u8 x = inb(ec->command_addr); |
86dae015 | 124 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 125 | return x; |
451566f4 DT |
126 | } |
127 | ||
6ffb221a | 128 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 129 | { |
3ebe08a7 | 130 | u8 x = inb(ec->data_addr); |
86dae015 | 131 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 132 | return x; |
7c6db5e5 DS |
133 | } |
134 | ||
6ffb221a | 135 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 136 | { |
86dae015 | 137 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 138 | outb(command, ec->command_addr); |
45bea155 LY |
139 | } |
140 | ||
6ffb221a | 141 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 142 | { |
86dae015 | 143 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 144 | outb(data, ec->data_addr); |
703959d4 | 145 | } |
45bea155 | 146 | |
7c6db4e0 | 147 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 148 | { |
7c6db4e0 AS |
149 | unsigned long flags; |
150 | int ret = 0; | |
8463200a | 151 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 152 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 153 | ret = 1; |
8463200a | 154 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 155 | return ret; |
45bea155 | 156 | } |
451566f4 | 157 | |
a2f93aea AS |
158 | static void start_transaction(struct acpi_ec *ec) |
159 | { | |
160 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
161 | ec->curr->done = false; | |
162 | acpi_ec_write_cmd(ec, ec->curr->command); | |
163 | } | |
164 | ||
2a84cb98 | 165 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 166 | { |
7c6db4e0 | 167 | unsigned long flags; |
8463200a AS |
168 | spin_lock_irqsave(&ec->curr_lock, flags); |
169 | if (!ec->curr) | |
7c6db4e0 | 170 | goto unlock; |
a2f93aea AS |
171 | if (ec->curr->wlen > ec->curr->wi) { |
172 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
173 | acpi_ec_write_data(ec, | |
174 | ec->curr->wdata[ec->curr->wi++]); | |
175 | else | |
dd15f8c4 | 176 | goto err; |
a2f93aea | 177 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 178 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
179 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
180 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 181 | ec->curr->done = true; |
7c6db4e0 | 182 | } else |
dd15f8c4 | 183 | goto err; |
a2f93aea AS |
184 | } else if (ec->curr->wlen == ec->curr->wi && |
185 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
186 | ec->curr->done = true; |
187 | goto unlock; | |
188 | err: | |
189 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
190 | if (in_interrupt()) |
191 | ++ec->curr->irq_count; | |
7c6db4e0 | 192 | unlock: |
8463200a | 193 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 194 | } |
03d1d99c | 195 | |
a62e8f19 | 196 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 197 | |
a62e8f19 | 198 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 199 | { |
7c6db4e0 AS |
200 | if (state & ACPI_EC_FLAG_SCI) { |
201 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 202 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
203 | } |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int ec_poll(struct acpi_ec *ec) | |
208 | { | |
2a84cb98 AS |
209 | unsigned long flags; |
210 | int repeat = 2; /* number of command restarts */ | |
211 | while (repeat--) { | |
212 | unsigned long delay = jiffies + | |
213 | msecs_to_jiffies(ACPI_EC_DELAY); | |
214 | do { | |
215 | /* don't sleep with disabled interrupts */ | |
216 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
217 | udelay(ACPI_EC_MSI_UDELAY); | |
218 | if (ec_transaction_done(ec)) | |
219 | return 0; | |
220 | } else { | |
221 | if (wait_event_timeout(ec->wait, | |
222 | ec_transaction_done(ec), | |
223 | msecs_to_jiffies(1))) | |
224 | return 0; | |
225 | } | |
226 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
227 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 228 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 229 | break; |
2a84cb98 AS |
230 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
231 | spin_lock_irqsave(&ec->curr_lock, flags); | |
232 | start_transaction(ec); | |
233 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 234 | } |
b77d81b2 | 235 | return -ETIME; |
1da177e4 LT |
236 | } |
237 | ||
8463200a | 238 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 239 | struct transaction *t) |
45bea155 | 240 | { |
7c6db4e0 | 241 | unsigned long tmp; |
7c6db4e0 | 242 | int ret = 0; |
5423a0cb | 243 | if (EC_FLAGS_MSI) |
2a84cb98 | 244 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 245 | /* start transaction */ |
8463200a | 246 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 247 | /* following two actions should be kept atomic */ |
8463200a | 248 | ec->curr = t; |
a2f93aea | 249 | start_transaction(ec); |
8463200a | 250 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 251 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 252 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 253 | ret = ec_poll(ec); |
8463200a AS |
254 | spin_lock_irqsave(&ec->curr_lock, tmp); |
255 | ec->curr = NULL; | |
256 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
257 | return ret; |
258 | } | |
259 | ||
260 | static int ec_check_ibf0(struct acpi_ec *ec) | |
261 | { | |
262 | u8 status = acpi_ec_read_status(ec); | |
263 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
264 | } |
265 | ||
c0ff1772 AS |
266 | static int ec_wait_ibf0(struct acpi_ec *ec) |
267 | { | |
268 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
269 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 270 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
271 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
272 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
273 | return 0; |
274 | return -ETIME; | |
45bea155 LY |
275 | } |
276 | ||
2a84cb98 | 277 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 278 | { |
d7a76e4c | 279 | int status; |
50526df6 | 280 | u32 glk; |
8463200a | 281 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 282 | return -EINVAL; |
8463200a AS |
283 | if (t->rdata) |
284 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 285 | mutex_lock(&ec->lock); |
fe955682 | 286 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
287 | status = -EINVAL; |
288 | goto unlock; | |
289 | } | |
703959d4 | 290 | if (ec->global_lock) { |
1da177e4 | 291 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 292 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
293 | status = -ENODEV; |
294 | goto unlock; | |
c24e912b | 295 | } |
1da177e4 | 296 | } |
c0ff1772 | 297 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
298 | pr_err(PREFIX "input buffer is not empty, " |
299 | "aborting transaction\n"); | |
7c6db4e0 | 300 | status = -ETIME; |
451566f4 | 301 | goto end; |
716e084e | 302 | } |
a62e8f19 AS |
303 | pr_debug(PREFIX "transaction start\n"); |
304 | /* disable GPE during transaction if storm is detected */ | |
305 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
cbbc0de7 RW |
306 | /* |
307 | * It has to be disabled at the hardware level regardless of the | |
308 | * GPE reference counting, so that it doesn't trigger. | |
309 | */ | |
9630bdd9 | 310 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
a62e8f19 AS |
311 | } |
312 | ||
2a84cb98 | 313 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
314 | |
315 | /* check if we received SCI during transaction */ | |
316 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
317 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 318 | msleep(1); |
cbbc0de7 RW |
319 | /* |
320 | * It is safe to enable the GPE outside of the transaction. Use | |
321 | * acpi_set_gpe() for that, since we used it to disable the GPE | |
322 | * above. | |
323 | */ | |
9630bdd9 | 324 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
a62e8f19 AS |
325 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
326 | pr_info(PREFIX "GPE storm detected, " | |
327 | "transactions will use polling mode\n"); | |
328 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
329 | } | |
54070101 | 330 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 331 | end: |
703959d4 | 332 | if (ec->global_lock) |
1da177e4 | 333 | acpi_release_global_lock(glk); |
7c6db4e0 | 334 | unlock: |
523953b4 | 335 | mutex_unlock(&ec->lock); |
d550d98d | 336 | return status; |
1da177e4 LT |
337 | } |
338 | ||
8a383ef0 | 339 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
340 | { |
341 | u8 d; | |
8463200a AS |
342 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
343 | .wdata = NULL, .rdata = &d, | |
344 | .wlen = 0, .rlen = 1}; | |
345 | ||
2a84cb98 | 346 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
347 | } |
348 | ||
8a383ef0 | 349 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 350 | { |
8463200a AS |
351 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
352 | .wdata = NULL, .rdata = NULL, | |
353 | .wlen = 0, .rlen = 0}; | |
354 | ||
7c6db4e0 | 355 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 356 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
357 | } |
358 | ||
6ccedb10 | 359 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
360 | { |
361 | int result; | |
362 | u8 d; | |
8463200a AS |
363 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
364 | .wdata = &address, .rdata = &d, | |
365 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 366 | |
2a84cb98 | 367 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
368 | *data = d; |
369 | return result; | |
370 | } | |
6ffb221a | 371 | |
3576cf61 DS |
372 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
373 | { | |
6ccedb10 | 374 | u8 wdata[2] = { address, data }; |
8463200a AS |
375 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
376 | .wdata = wdata, .rdata = NULL, | |
377 | .wlen = 2, .rlen = 0}; | |
378 | ||
2a84cb98 | 379 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
380 | } |
381 | ||
1da177e4 LT |
382 | /* |
383 | * Externally callable EC access functions. For now, assume 1 EC only | |
384 | */ | |
c45aac43 AS |
385 | int ec_burst_enable(void) |
386 | { | |
c45aac43 AS |
387 | if (!first_ec) |
388 | return -ENODEV; | |
d033879c | 389 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
390 | } |
391 | ||
392 | EXPORT_SYMBOL(ec_burst_enable); | |
393 | ||
394 | int ec_burst_disable(void) | |
395 | { | |
c45aac43 AS |
396 | if (!first_ec) |
397 | return -ENODEV; | |
d033879c | 398 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
399 | } |
400 | ||
401 | EXPORT_SYMBOL(ec_burst_disable); | |
402 | ||
6ccedb10 | 403 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 404 | { |
1da177e4 | 405 | int err; |
6ffb221a | 406 | u8 temp_data; |
1da177e4 LT |
407 | |
408 | if (!first_ec) | |
409 | return -ENODEV; | |
410 | ||
d033879c | 411 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
412 | |
413 | if (!err) { | |
414 | *val = temp_data; | |
415 | return 0; | |
50526df6 | 416 | } else |
1da177e4 LT |
417 | return err; |
418 | } | |
50526df6 | 419 | |
1da177e4 LT |
420 | EXPORT_SYMBOL(ec_read); |
421 | ||
50526df6 | 422 | int ec_write(u8 addr, u8 val) |
1da177e4 | 423 | { |
1da177e4 LT |
424 | int err; |
425 | ||
426 | if (!first_ec) | |
427 | return -ENODEV; | |
428 | ||
d033879c | 429 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
430 | |
431 | return err; | |
432 | } | |
50526df6 | 433 | |
1da177e4 LT |
434 | EXPORT_SYMBOL(ec_write); |
435 | ||
616362de | 436 | int ec_transaction(u8 command, |
9e197219 | 437 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
438 | u8 * rdata, unsigned rdata_len, |
439 | int force_poll) | |
45bea155 | 440 | { |
8463200a AS |
441 | struct transaction t = {.command = command, |
442 | .wdata = wdata, .rdata = rdata, | |
443 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
444 | if (!first_ec) |
445 | return -ENODEV; | |
45bea155 | 446 | |
2a84cb98 | 447 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 448 | } |
1da177e4 | 449 | |
ab9e43c6 LP |
450 | EXPORT_SYMBOL(ec_transaction); |
451 | ||
fe955682 | 452 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
453 | { |
454 | struct acpi_ec *ec = first_ec; | |
455 | ||
456 | if (!ec) | |
457 | return; | |
458 | ||
459 | mutex_lock(&ec->lock); | |
460 | /* Prevent transactions from being carried out */ | |
fe955682 | 461 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
462 | mutex_unlock(&ec->lock); |
463 | } | |
464 | ||
fe955682 | 465 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
466 | { |
467 | struct acpi_ec *ec = first_ec; | |
468 | ||
469 | if (!ec) | |
470 | return; | |
471 | ||
472 | mutex_lock(&ec->lock); | |
473 | /* Allow transactions to be carried out again */ | |
fe955682 | 474 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
475 | mutex_unlock(&ec->lock); |
476 | } | |
477 | ||
fe955682 | 478 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
479 | { |
480 | /* | |
481 | * Allow transactions to happen again (this function is called from | |
482 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
483 | */ | |
484 | if (first_ec) | |
fe955682 | 485 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
486 | } |
487 | ||
a62e8f19 | 488 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
489 | { |
490 | int result; | |
6ccedb10 | 491 | u8 d; |
8463200a AS |
492 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
493 | .wdata = NULL, .rdata = &d, | |
494 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
495 | if (!ec || !data) |
496 | return -EINVAL; | |
6ccedb10 AS |
497 | /* |
498 | * Query the EC to find out which _Qxx method we need to evaluate. | |
499 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
500 | * bit to be cleared (and thus clearing the interrupt source). | |
501 | */ | |
a62e8f19 | 502 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
503 | if (result) |
504 | return result; | |
6ccedb10 AS |
505 | if (!d) |
506 | return -ENODATA; | |
6ccedb10 AS |
507 | *data = d; |
508 | return 0; | |
1da177e4 LT |
509 | } |
510 | ||
1da177e4 LT |
511 | /* -------------------------------------------------------------------------- |
512 | Event Management | |
513 | -------------------------------------------------------------------------- */ | |
837012ed AS |
514 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
515 | acpi_handle handle, acpi_ec_query_func func, | |
516 | void *data) | |
517 | { | |
518 | struct acpi_ec_query_handler *handler = | |
519 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
520 | if (!handler) | |
521 | return -ENOMEM; | |
522 | ||
523 | handler->query_bit = query_bit; | |
524 | handler->handle = handle; | |
525 | handler->func = func; | |
526 | handler->data = data; | |
527 | mutex_lock(&ec->lock); | |
30c08574 | 528 | list_add(&handler->node, &ec->list); |
837012ed AS |
529 | mutex_unlock(&ec->lock); |
530 | return 0; | |
531 | } | |
532 | ||
533 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
534 | ||
535 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
536 | { | |
1544fdbc | 537 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 538 | mutex_lock(&ec->lock); |
1544fdbc | 539 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
540 | if (query_bit == handler->query_bit) { |
541 | list_del(&handler->node); | |
542 | kfree(handler); | |
837012ed AS |
543 | } |
544 | } | |
545 | mutex_unlock(&ec->lock); | |
546 | } | |
547 | ||
548 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 549 | |
a62e8f19 | 550 | static void acpi_ec_run(void *cxt) |
45bea155 | 551 | { |
a62e8f19 AS |
552 | struct acpi_ec_query_handler *handler = cxt; |
553 | if (!handler) | |
e41334c0 | 554 | return; |
a62e8f19 AS |
555 | pr_debug(PREFIX "start query execution\n"); |
556 | if (handler->func) | |
557 | handler->func(handler->data); | |
558 | else if (handler->handle) | |
559 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
560 | pr_debug(PREFIX "stop query execution\n"); | |
561 | kfree(handler); | |
562 | } | |
563 | ||
564 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
565 | { | |
566 | u8 value = 0; | |
567 | int status; | |
568 | struct acpi_ec_query_handler *handler, *copy; | |
569 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
570 | return status; | |
837012ed AS |
571 | list_for_each_entry(handler, &ec->list, node) { |
572 | if (value == handler->query_bit) { | |
573 | /* have custom handler for this bit */ | |
a62e8f19 AS |
574 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
575 | if (!copy) | |
576 | return -ENOMEM; | |
577 | memcpy(copy, handler, sizeof(*copy)); | |
578 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
579 | return acpi_os_execute((copy->func) ? |
580 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 581 | acpi_ec_run, copy); |
837012ed AS |
582 | } |
583 | } | |
a62e8f19 AS |
584 | return 0; |
585 | } | |
586 | ||
587 | static void acpi_ec_gpe_query(void *ec_cxt) | |
588 | { | |
589 | struct acpi_ec *ec = ec_cxt; | |
590 | if (!ec) | |
591 | return; | |
592 | mutex_lock(&ec->lock); | |
593 | acpi_ec_sync_query(ec); | |
837012ed | 594 | mutex_unlock(&ec->lock); |
45bea155 | 595 | } |
1da177e4 | 596 | |
a62e8f19 AS |
597 | static void acpi_ec_gpe_query(void *ec_cxt); |
598 | ||
599 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
600 | { | |
601 | if (state & ACPI_EC_FLAG_SCI) { | |
602 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
603 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
604 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
605 | acpi_ec_gpe_query, ec); | |
606 | } | |
607 | } | |
608 | return 0; | |
609 | } | |
610 | ||
50526df6 | 611 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 612 | { |
3d02b90b | 613 | struct acpi_ec *ec = data; |
00eb43a1 | 614 | |
3ebe08a7 | 615 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 616 | |
a62e8f19 AS |
617 | advance_transaction(ec, acpi_ec_read_status(ec)); |
618 | if (ec_transaction_done(ec) && | |
619 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 620 | wake_up(&ec->wait); |
a62e8f19 AS |
621 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
622 | } | |
7c6db4e0 | 623 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
624 | } |
625 | ||
1da177e4 LT |
626 | /* -------------------------------------------------------------------------- |
627 | Address Space Management | |
628 | -------------------------------------------------------------------------- */ | |
629 | ||
1da177e4 | 630 | static acpi_status |
5b7734b4 | 631 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 632 | u32 bits, u64 *value64, |
50526df6 | 633 | void *handler_context, void *region_context) |
1da177e4 | 634 | { |
3d02b90b | 635 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
636 | int result = 0, i, bytes = bits / 8; |
637 | u8 *value = (u8 *)value64; | |
1da177e4 | 638 | |
1da177e4 | 639 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 640 | return AE_BAD_PARAMETER; |
1da177e4 | 641 | |
5b7734b4 | 642 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 643 | return AE_BAD_PARAMETER; |
1da177e4 | 644 | |
dadf28a1 | 645 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 646 | acpi_ec_burst_enable(ec); |
b3b233c7 | 647 | |
dadf28a1 AS |
648 | for (i = 0; i < bytes; ++i, ++address, ++value) |
649 | result = (function == ACPI_READ) ? | |
650 | acpi_ec_read(ec, address, value) : | |
651 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 652 | |
dadf28a1 | 653 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 654 | acpi_ec_burst_disable(ec); |
b3b233c7 | 655 | |
1da177e4 LT |
656 | switch (result) { |
657 | case -EINVAL: | |
d550d98d | 658 | return AE_BAD_PARAMETER; |
1da177e4 LT |
659 | break; |
660 | case -ENODEV: | |
d550d98d | 661 | return AE_NOT_FOUND; |
1da177e4 LT |
662 | break; |
663 | case -ETIME: | |
d550d98d | 664 | return AE_TIME; |
1da177e4 LT |
665 | break; |
666 | default: | |
d550d98d | 667 | return AE_OK; |
1da177e4 | 668 | } |
1da177e4 LT |
669 | } |
670 | ||
1da177e4 LT |
671 | /* -------------------------------------------------------------------------- |
672 | Driver Interface | |
673 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
674 | static acpi_status |
675 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
676 | ||
c0900c35 AS |
677 | static struct acpi_ec *make_acpi_ec(void) |
678 | { | |
679 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
680 | if (!ec) | |
681 | return NULL; | |
080e412c | 682 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
683 | mutex_init(&ec->lock); |
684 | init_waitqueue_head(&ec->wait); | |
837012ed | 685 | INIT_LIST_HEAD(&ec->list); |
8463200a | 686 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
687 | return ec; |
688 | } | |
837012ed | 689 | |
c019b193 AS |
690 | static acpi_status |
691 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
692 | void *context, void **return_value) | |
693 | { | |
0175d562 LM |
694 | char node_name[5]; |
695 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
696 | struct acpi_ec *ec = context; |
697 | int value = 0; | |
0175d562 LM |
698 | acpi_status status; |
699 | ||
700 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
701 | ||
702 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
703 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
704 | } | |
705 | return AE_OK; | |
706 | } | |
707 | ||
cd8c93a4 AS |
708 | static acpi_status |
709 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 710 | { |
cd8c93a4 | 711 | acpi_status status; |
d21cf3c1 | 712 | unsigned long long tmp = 0; |
cd8c93a4 AS |
713 | |
714 | struct acpi_ec *ec = context; | |
a5032bfd AS |
715 | |
716 | /* clear addr values, ec_parse_io_ports depend on it */ | |
717 | ec->command_addr = ec->data_addr = 0; | |
718 | ||
cd8c93a4 AS |
719 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
720 | ec_parse_io_ports, ec); | |
721 | if (ACPI_FAILURE(status)) | |
722 | return status; | |
837012ed AS |
723 | |
724 | /* Get GPE bit assignment (EC events). */ | |
725 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 726 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
727 | if (ACPI_FAILURE(status)) |
728 | return status; | |
27663c58 | 729 | ec->gpe = tmp; |
837012ed | 730 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 731 | tmp = 0; |
27663c58 MW |
732 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
733 | ec->global_lock = tmp; | |
837012ed | 734 | ec->handle = handle; |
cd8c93a4 | 735 | return AE_CTRL_TERMINATE; |
837012ed AS |
736 | } |
737 | ||
5efc5476 BH |
738 | static int ec_install_handlers(struct acpi_ec *ec) |
739 | { | |
740 | acpi_status status; | |
741 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
742 | return 0; | |
743 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
744 | ACPI_GPE_EDGE_TRIGGERED, | |
745 | &acpi_ec_gpe_handler, ec); | |
746 | if (ACPI_FAILURE(status)) | |
747 | return -ENODEV; | |
9630bdd9 RW |
748 | |
749 | acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
5efc5476 BH |
750 | status = acpi_install_address_space_handler(ec->handle, |
751 | ACPI_ADR_SPACE_EC, | |
752 | &acpi_ec_space_handler, | |
753 | NULL, ec); | |
754 | if (ACPI_FAILURE(status)) { | |
755 | if (status == AE_NOT_FOUND) { | |
756 | /* | |
757 | * Maybe OS fails in evaluating the _REG object. | |
758 | * The AE_NOT_FOUND error will be ignored and OS | |
759 | * continue to initialize EC. | |
760 | */ | |
761 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
762 | " of EC device. Broken bios is suspected.\n"); | |
763 | } else { | |
764 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
765 | &acpi_ec_gpe_handler); | |
9630bdd9 | 766 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
5efc5476 BH |
767 | return -ENODEV; |
768 | } | |
769 | } | |
770 | ||
771 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
772 | return 0; | |
773 | } | |
774 | ||
4c611060 AS |
775 | static void ec_remove_handlers(struct acpi_ec *ec) |
776 | { | |
9630bdd9 | 777 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
4c611060 AS |
778 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
779 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 780 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
781 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
782 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 783 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 784 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
785 | } |
786 | ||
703959d4 | 787 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 788 | { |
703959d4 | 789 | struct acpi_ec *ec = NULL; |
d02be047 | 790 | int ret; |
45bea155 | 791 | |
c0900c35 AS |
792 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
793 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
794 | ||
4c611060 | 795 | /* Check for boot EC */ |
ce52ddf5 AS |
796 | if (boot_ec && |
797 | (boot_ec->handle == device->handle || | |
798 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
799 | ec = boot_ec; | |
800 | boot_ec = NULL; | |
801 | } else { | |
802 | ec = make_acpi_ec(); | |
803 | if (!ec) | |
804 | return -ENOMEM; | |
a5032bfd AS |
805 | } |
806 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
807 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
808 | kfree(ec); |
809 | return -EINVAL; | |
4c611060 AS |
810 | } |
811 | ||
c0900c35 | 812 | ec->handle = device->handle; |
ce52ddf5 AS |
813 | |
814 | /* Find and register all query methods */ | |
815 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 816 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 817 | |
4c611060 AS |
818 | if (!first_ec) |
819 | first_ec = ec; | |
db89b4f0 | 820 | device->driver_data = ec; |
de4f1046 TR |
821 | |
822 | WARN(!request_region(ec->data_addr, 1, "EC data"), | |
823 | "Could not request EC data io port 0x%lx", ec->data_addr); | |
824 | WARN(!request_region(ec->command_addr, 1, "EC cmd"), | |
825 | "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
826 | ||
3ebe08a7 | 827 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 828 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
829 | |
830 | ret = ec_install_handlers(ec); | |
831 | ||
832 | /* EC is fully operational, allow queries */ | |
833 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
834 | return ret; | |
1da177e4 LT |
835 | } |
836 | ||
50526df6 | 837 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 838 | { |
01f22462 | 839 | struct acpi_ec *ec; |
07ddf768 | 840 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 841 | |
1da177e4 | 842 | if (!device) |
d550d98d | 843 | return -EINVAL; |
1da177e4 LT |
844 | |
845 | ec = acpi_driver_data(device); | |
cf745ec7 | 846 | ec_remove_handlers(ec); |
837012ed | 847 | mutex_lock(&ec->lock); |
07ddf768 | 848 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
849 | list_del(&handler->node); |
850 | kfree(handler); | |
851 | } | |
852 | mutex_unlock(&ec->lock); | |
de4f1046 TR |
853 | release_region(ec->data_addr, 1); |
854 | release_region(ec->command_addr, 1); | |
db89b4f0 | 855 | device->driver_data = NULL; |
d033879c | 856 | if (ec == first_ec) |
c0900c35 | 857 | first_ec = NULL; |
4c611060 | 858 | kfree(ec); |
d550d98d | 859 | return 0; |
1da177e4 LT |
860 | } |
861 | ||
1da177e4 | 862 | static acpi_status |
c0900c35 | 863 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 864 | { |
3d02b90b | 865 | struct acpi_ec *ec = context; |
1da177e4 | 866 | |
01f22462 | 867 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 868 | return AE_OK; |
1da177e4 LT |
869 | |
870 | /* | |
871 | * The first address region returned is the data port, and | |
872 | * the second address region returned is the status/command | |
873 | * port. | |
874 | */ | |
de4f1046 | 875 | if (ec->data_addr == 0) |
6ffb221a | 876 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 877 | else if (ec->command_addr == 0) |
6ffb221a | 878 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 879 | else |
1da177e4 | 880 | return AE_CTRL_TERMINATE; |
1da177e4 | 881 | |
1da177e4 LT |
882 | return AE_OK; |
883 | } | |
884 | ||
c04209a7 AS |
885 | int __init acpi_boot_ec_enable(void) |
886 | { | |
7c6db4e0 | 887 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
888 | return 0; |
889 | if (!ec_install_handlers(boot_ec)) { | |
890 | first_ec = boot_ec; | |
891 | return 0; | |
892 | } | |
893 | return -EFAULT; | |
894 | } | |
895 | ||
223883b7 AS |
896 | static const struct acpi_device_id ec_device_ids[] = { |
897 | {"PNP0C09", 0}, | |
898 | {"", 0}, | |
899 | }; | |
900 | ||
478fa03b AS |
901 | /* Some BIOS do not survive early DSDT scan, skip it */ |
902 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
903 | { | |
904 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
905 | return 0; | |
906 | } | |
907 | ||
0adf3c74 AS |
908 | /* ASUStek often supplies us with broken ECDT, validate it */ |
909 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
910 | { | |
911 | EC_FLAGS_VALIDATE_ECDT = 1; | |
912 | return 0; | |
913 | } | |
914 | ||
915 | /* MSI EC needs special treatment, enable it */ | |
916 | static int ec_flag_msi(const struct dmi_system_id *id) | |
917 | { | |
55b313f2 | 918 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
919 | EC_FLAGS_MSI = 1; |
920 | EC_FLAGS_VALIDATE_ECDT = 1; | |
921 | return 0; | |
922 | } | |
923 | ||
924 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
925 | { |
926 | ec_skip_dsdt_scan, "Compal JFL92", { | |
927 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
928 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
929 | { |
930 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
931 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
932 | { | |
933 | ec_flag_msi, "MSI hardware", { | |
934 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
935 | { | |
936 | ec_flag_msi, "MSI hardware", { | |
937 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 AS |
938 | { |
939 | ec_validate_ecdt, "ASUS hardware", { | |
940 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
941 | {}, | |
942 | }; | |
943 | ||
944 | ||
c0900c35 AS |
945 | int __init acpi_ec_ecdt_probe(void) |
946 | { | |
c0900c35 | 947 | acpi_status status; |
c6cb0e87 | 948 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 949 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 950 | |
d66d969d AS |
951 | boot_ec = make_acpi_ec(); |
952 | if (!boot_ec) | |
c0900c35 AS |
953 | return -ENOMEM; |
954 | /* | |
955 | * Generate a boot ec context | |
956 | */ | |
0adf3c74 | 957 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
958 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
959 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 960 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 961 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
962 | boot_ec->command_addr = ecdt_ptr->control.address; |
963 | boot_ec->data_addr = ecdt_ptr->data.address; | |
964 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 965 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 966 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 967 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 968 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 969 | goto install; |
d6bd535d | 970 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
971 | if (!saved_ec) |
972 | return -ENOMEM; | |
c5279dee | 973 | /* fall through */ |
cd8c93a4 | 974 | } |
0adf3c74 | 975 | |
478fa03b AS |
976 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
977 | return -ENODEV; | |
978 | ||
c5279dee AS |
979 | /* This workaround is needed only on some broken machines, |
980 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
981 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
982 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
983 | boot_ec, NULL); | |
984 | /* Check that acpi_get_devices actually find something */ | |
985 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
986 | goto error; | |
c6cb0e87 AS |
987 | if (saved_ec) { |
988 | /* try to find good ECDT from ASUSTek */ | |
989 | if (saved_ec->command_addr != boot_ec->command_addr || | |
990 | saved_ec->data_addr != boot_ec->data_addr || | |
991 | saved_ec->gpe != boot_ec->gpe || | |
992 | saved_ec->handle != boot_ec->handle) | |
993 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
994 | "ECDT tables, which are very hard to workaround. " | |
995 | "Trying to use DSDT EC info instead. Please send " | |
996 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
997 | kfree(saved_ec); | |
998 | saved_ec = NULL; | |
999 | } else { | |
1000 | /* We really need to limit this workaround, the only ASUS, | |
1001 | * which needs it, has fake EC._INI method, so use it as flag. | |
1002 | * Keep boot_ec struct as it will be needed soon. | |
1003 | */ | |
1004 | acpi_handle dummy; | |
1005 | if (!dmi_name_in_vendors("ASUS") || | |
1006 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1007 | &dummy))) | |
1008 | return -ENODEV; | |
1009 | } | |
c5279dee AS |
1010 | install: |
1011 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1012 | first_ec = boot_ec; |
e8284321 | 1013 | return 0; |
d033879c | 1014 | } |
c5279dee | 1015 | error: |
d66d969d AS |
1016 | kfree(boot_ec); |
1017 | boot_ec = NULL; | |
1da177e4 LT |
1018 | return -ENODEV; |
1019 | } | |
1020 | ||
223883b7 AS |
1021 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1022 | { | |
1023 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1024 | /* Stop using the GPE, but keep it reference counted. */ |
9630bdd9 | 1025 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
223883b7 AS |
1026 | return 0; |
1027 | } | |
1028 | ||
1029 | static int acpi_ec_resume(struct acpi_device *device) | |
1030 | { | |
1031 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1032 | /* Enable the GPE again, but don't reference count it once more. */ |
9630bdd9 | 1033 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
223883b7 AS |
1034 | return 0; |
1035 | } | |
1036 | ||
1037 | static struct acpi_driver acpi_ec_driver = { | |
1038 | .name = "ec", | |
1039 | .class = ACPI_EC_CLASS, | |
1040 | .ids = ec_device_ids, | |
1041 | .ops = { | |
1042 | .add = acpi_ec_add, | |
1043 | .remove = acpi_ec_remove, | |
223883b7 AS |
1044 | .suspend = acpi_ec_suspend, |
1045 | .resume = acpi_ec_resume, | |
1046 | }, | |
1047 | }; | |
1048 | ||
a5f820fe | 1049 | int __init acpi_ec_init(void) |
1da177e4 | 1050 | { |
50526df6 | 1051 | int result = 0; |
1da177e4 | 1052 | |
1da177e4 LT |
1053 | /* Now register the driver for the EC */ |
1054 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1055 | if (result < 0) |
d550d98d | 1056 | return -ENODEV; |
1da177e4 | 1057 | |
d550d98d | 1058 | return result; |
1da177e4 LT |
1059 | } |
1060 | ||
1da177e4 LT |
1061 | /* EC driver currently not unloadable */ |
1062 | #if 0 | |
50526df6 | 1063 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1064 | { |
1da177e4 LT |
1065 | |
1066 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1067 | return; |
1da177e4 | 1068 | } |
7843932a | 1069 | #endif /* 0 */ |