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Commit | Line | Data |
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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 | |
1da177e4 | 46 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
48 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 49 | |
af3fd140 | 50 | #define PREFIX "ACPI: EC: " |
4350933a | 51 | |
703959d4 | 52 | /* EC status register */ |
1da177e4 LT |
53 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
54 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 57 | |
703959d4 | 58 | /* EC commands */ |
3261ff4d | 59 | enum ec_command { |
6ccedb10 AS |
60 | ACPI_EC_COMMAND_READ = 0x80, |
61 | ACPI_EC_COMMAND_WRITE = 0x81, | |
62 | ACPI_EC_BURST_ENABLE = 0x82, | |
63 | ACPI_EC_BURST_DISABLE = 0x83, | |
64 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 65 | }; |
837012ed | 66 | |
5c406412 | 67 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 68 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
34ff4dbc | 69 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
2a84cb98 | 70 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 71 | |
06cf7d3c | 72 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
73 | per one transaction */ |
74 | ||
080e412c | 75 | enum { |
080e412c | 76 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 77 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 78 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 79 | * OpReg are installed */ |
fe955682 | 80 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 81 | }; |
6ffb221a DS |
82 | |
83 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 84 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
85 | typedef int (*acpi_ec_query_func) (void *data); |
86 | ||
87 | struct acpi_ec_query_handler { | |
88 | struct list_head node; | |
89 | acpi_ec_query_func func; | |
90 | acpi_handle handle; | |
91 | void *data; | |
92 | u8 query_bit; | |
93 | }; | |
94 | ||
8463200a | 95 | struct transaction { |
7c6db4e0 AS |
96 | const u8 *wdata; |
97 | u8 *rdata; | |
98 | unsigned short irq_count; | |
8463200a | 99 | u8 command; |
a2f93aea AS |
100 | u8 wi; |
101 | u8 ri; | |
7c6db4e0 AS |
102 | u8 wlen; |
103 | u8 rlen; | |
dd15f8c4 | 104 | bool done; |
7c6db4e0 AS |
105 | }; |
106 | ||
a854e08a | 107 | static struct acpi_ec { |
703959d4 | 108 | acpi_handle handle; |
a86e2772 | 109 | unsigned long gpe; |
6ffb221a DS |
110 | unsigned long command_addr; |
111 | unsigned long data_addr; | |
703959d4 | 112 | unsigned long global_lock; |
080e412c | 113 | unsigned long flags; |
c787a855 | 114 | struct mutex lock; |
703959d4 | 115 | wait_queue_head_t wait; |
837012ed | 116 | struct list_head list; |
8463200a AS |
117 | struct transaction *curr; |
118 | spinlock_t curr_lock; | |
d033879c | 119 | } *boot_ec, *first_ec; |
703959d4 | 120 | |
5423a0cb | 121 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 122 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 123 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 124 | |
1da177e4 LT |
125 | /* -------------------------------------------------------------------------- |
126 | Transaction Management | |
127 | -------------------------------------------------------------------------- */ | |
128 | ||
6ffb221a | 129 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 130 | { |
3ebe08a7 | 131 | u8 x = inb(ec->command_addr); |
86dae015 | 132 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 133 | return x; |
451566f4 DT |
134 | } |
135 | ||
6ffb221a | 136 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 137 | { |
3ebe08a7 | 138 | u8 x = inb(ec->data_addr); |
86dae015 | 139 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 140 | return x; |
7c6db5e5 DS |
141 | } |
142 | ||
6ffb221a | 143 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 144 | { |
86dae015 | 145 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 146 | outb(command, ec->command_addr); |
45bea155 LY |
147 | } |
148 | ||
6ffb221a | 149 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 150 | { |
86dae015 | 151 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 152 | outb(data, ec->data_addr); |
703959d4 | 153 | } |
45bea155 | 154 | |
7c6db4e0 | 155 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 156 | { |
7c6db4e0 AS |
157 | unsigned long flags; |
158 | int ret = 0; | |
8463200a | 159 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 160 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 161 | ret = 1; |
8463200a | 162 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 163 | return ret; |
45bea155 | 164 | } |
451566f4 | 165 | |
a2f93aea AS |
166 | static void start_transaction(struct acpi_ec *ec) |
167 | { | |
168 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
169 | ec->curr->done = false; | |
170 | acpi_ec_write_cmd(ec, ec->curr->command); | |
171 | } | |
172 | ||
2a84cb98 | 173 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 174 | { |
7c6db4e0 | 175 | unsigned long flags; |
8463200a AS |
176 | spin_lock_irqsave(&ec->curr_lock, flags); |
177 | if (!ec->curr) | |
7c6db4e0 | 178 | goto unlock; |
a2f93aea AS |
179 | if (ec->curr->wlen > ec->curr->wi) { |
180 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
181 | acpi_ec_write_data(ec, | |
182 | ec->curr->wdata[ec->curr->wi++]); | |
183 | else | |
dd15f8c4 | 184 | goto err; |
a2f93aea | 185 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 186 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
187 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
188 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 189 | ec->curr->done = true; |
7c6db4e0 | 190 | } else |
dd15f8c4 | 191 | goto err; |
a2f93aea AS |
192 | } else if (ec->curr->wlen == ec->curr->wi && |
193 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
194 | ec->curr->done = true; |
195 | goto unlock; | |
196 | err: | |
197 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
198 | if (in_interrupt()) |
199 | ++ec->curr->irq_count; | |
7c6db4e0 | 200 | unlock: |
8463200a | 201 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 202 | } |
03d1d99c | 203 | |
a62e8f19 | 204 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 205 | |
a62e8f19 | 206 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 207 | { |
7c6db4e0 AS |
208 | if (state & ACPI_EC_FLAG_SCI) { |
209 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 210 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
211 | } |
212 | return 0; | |
213 | } | |
214 | ||
215 | static int ec_poll(struct acpi_ec *ec) | |
216 | { | |
2a84cb98 AS |
217 | unsigned long flags; |
218 | int repeat = 2; /* number of command restarts */ | |
219 | while (repeat--) { | |
220 | unsigned long delay = jiffies + | |
221 | msecs_to_jiffies(ACPI_EC_DELAY); | |
222 | do { | |
223 | /* don't sleep with disabled interrupts */ | |
224 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
225 | udelay(ACPI_EC_MSI_UDELAY); | |
226 | if (ec_transaction_done(ec)) | |
227 | return 0; | |
228 | } else { | |
229 | if (wait_event_timeout(ec->wait, | |
230 | ec_transaction_done(ec), | |
231 | msecs_to_jiffies(1))) | |
232 | return 0; | |
233 | } | |
234 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
235 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 236 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 237 | break; |
2a84cb98 AS |
238 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
239 | spin_lock_irqsave(&ec->curr_lock, flags); | |
240 | start_transaction(ec); | |
241 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 242 | } |
b77d81b2 | 243 | return -ETIME; |
1da177e4 LT |
244 | } |
245 | ||
8463200a | 246 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 247 | struct transaction *t) |
45bea155 | 248 | { |
7c6db4e0 | 249 | unsigned long tmp; |
7c6db4e0 | 250 | int ret = 0; |
5423a0cb | 251 | if (EC_FLAGS_MSI) |
2a84cb98 | 252 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 253 | /* start transaction */ |
8463200a | 254 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 255 | /* following two actions should be kept atomic */ |
8463200a | 256 | ec->curr = t; |
a2f93aea | 257 | start_transaction(ec); |
8463200a | 258 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 259 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 260 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 261 | ret = ec_poll(ec); |
8463200a AS |
262 | spin_lock_irqsave(&ec->curr_lock, tmp); |
263 | ec->curr = NULL; | |
264 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
265 | return ret; |
266 | } | |
267 | ||
268 | static int ec_check_ibf0(struct acpi_ec *ec) | |
269 | { | |
270 | u8 status = acpi_ec_read_status(ec); | |
271 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
272 | } |
273 | ||
c0ff1772 AS |
274 | static int ec_wait_ibf0(struct acpi_ec *ec) |
275 | { | |
276 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
277 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 278 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
279 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
280 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
281 | return 0; |
282 | return -ETIME; | |
45bea155 LY |
283 | } |
284 | ||
2a84cb98 | 285 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 286 | { |
d7a76e4c | 287 | int status; |
50526df6 | 288 | u32 glk; |
8463200a | 289 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 290 | return -EINVAL; |
8463200a AS |
291 | if (t->rdata) |
292 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 293 | mutex_lock(&ec->lock); |
fe955682 | 294 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
295 | status = -EINVAL; |
296 | goto unlock; | |
297 | } | |
703959d4 | 298 | if (ec->global_lock) { |
1da177e4 | 299 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 300 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
301 | status = -ENODEV; |
302 | goto unlock; | |
c24e912b | 303 | } |
1da177e4 | 304 | } |
c0ff1772 | 305 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
306 | pr_err(PREFIX "input buffer is not empty, " |
307 | "aborting transaction\n"); | |
7c6db4e0 | 308 | status = -ETIME; |
451566f4 | 309 | goto end; |
716e084e | 310 | } |
a62e8f19 AS |
311 | pr_debug(PREFIX "transaction start\n"); |
312 | /* disable GPE during transaction if storm is detected */ | |
313 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
cbbc0de7 RW |
314 | /* |
315 | * It has to be disabled at the hardware level regardless of the | |
316 | * GPE reference counting, so that it doesn't trigger. | |
317 | */ | |
9630bdd9 | 318 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
a62e8f19 AS |
319 | } |
320 | ||
2a84cb98 | 321 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
322 | |
323 | /* check if we received SCI during transaction */ | |
324 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
325 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 326 | msleep(1); |
cbbc0de7 RW |
327 | /* |
328 | * It is safe to enable the GPE outside of the transaction. Use | |
329 | * acpi_set_gpe() for that, since we used it to disable the GPE | |
330 | * above. | |
331 | */ | |
9630bdd9 | 332 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
a62e8f19 AS |
333 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
334 | pr_info(PREFIX "GPE storm detected, " | |
335 | "transactions will use polling mode\n"); | |
336 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
337 | } | |
54070101 | 338 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 339 | end: |
703959d4 | 340 | if (ec->global_lock) |
1da177e4 | 341 | acpi_release_global_lock(glk); |
7c6db4e0 | 342 | unlock: |
523953b4 | 343 | mutex_unlock(&ec->lock); |
d550d98d | 344 | return status; |
1da177e4 LT |
345 | } |
346 | ||
8a383ef0 | 347 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
348 | { |
349 | u8 d; | |
8463200a AS |
350 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
351 | .wdata = NULL, .rdata = &d, | |
352 | .wlen = 0, .rlen = 1}; | |
353 | ||
2a84cb98 | 354 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
355 | } |
356 | ||
8a383ef0 | 357 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 358 | { |
8463200a AS |
359 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
360 | .wdata = NULL, .rdata = NULL, | |
361 | .wlen = 0, .rlen = 0}; | |
362 | ||
7c6db4e0 | 363 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 364 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
365 | } |
366 | ||
6ccedb10 | 367 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
368 | { |
369 | int result; | |
370 | u8 d; | |
8463200a AS |
371 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
372 | .wdata = &address, .rdata = &d, | |
373 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 374 | |
2a84cb98 | 375 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
376 | *data = d; |
377 | return result; | |
378 | } | |
6ffb221a | 379 | |
3576cf61 DS |
380 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
381 | { | |
6ccedb10 | 382 | u8 wdata[2] = { address, data }; |
8463200a AS |
383 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
384 | .wdata = wdata, .rdata = NULL, | |
385 | .wlen = 2, .rlen = 0}; | |
386 | ||
2a84cb98 | 387 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
388 | } |
389 | ||
1da177e4 LT |
390 | /* |
391 | * Externally callable EC access functions. For now, assume 1 EC only | |
392 | */ | |
c45aac43 AS |
393 | int ec_burst_enable(void) |
394 | { | |
c45aac43 AS |
395 | if (!first_ec) |
396 | return -ENODEV; | |
d033879c | 397 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
398 | } |
399 | ||
400 | EXPORT_SYMBOL(ec_burst_enable); | |
401 | ||
402 | int ec_burst_disable(void) | |
403 | { | |
c45aac43 AS |
404 | if (!first_ec) |
405 | return -ENODEV; | |
d033879c | 406 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
407 | } |
408 | ||
409 | EXPORT_SYMBOL(ec_burst_disable); | |
410 | ||
6ccedb10 | 411 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 412 | { |
1da177e4 | 413 | int err; |
6ffb221a | 414 | u8 temp_data; |
1da177e4 LT |
415 | |
416 | if (!first_ec) | |
417 | return -ENODEV; | |
418 | ||
d033879c | 419 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
420 | |
421 | if (!err) { | |
422 | *val = temp_data; | |
423 | return 0; | |
50526df6 | 424 | } else |
1da177e4 LT |
425 | return err; |
426 | } | |
50526df6 | 427 | |
1da177e4 LT |
428 | EXPORT_SYMBOL(ec_read); |
429 | ||
50526df6 | 430 | int ec_write(u8 addr, u8 val) |
1da177e4 | 431 | { |
1da177e4 LT |
432 | int err; |
433 | ||
434 | if (!first_ec) | |
435 | return -ENODEV; | |
436 | ||
d033879c | 437 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
438 | |
439 | return err; | |
440 | } | |
50526df6 | 441 | |
1da177e4 LT |
442 | EXPORT_SYMBOL(ec_write); |
443 | ||
616362de | 444 | int ec_transaction(u8 command, |
9e197219 | 445 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
446 | u8 * rdata, unsigned rdata_len, |
447 | int force_poll) | |
45bea155 | 448 | { |
8463200a AS |
449 | struct transaction t = {.command = command, |
450 | .wdata = wdata, .rdata = rdata, | |
451 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
452 | if (!first_ec) |
453 | return -ENODEV; | |
45bea155 | 454 | |
2a84cb98 | 455 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 456 | } |
1da177e4 | 457 | |
ab9e43c6 LP |
458 | EXPORT_SYMBOL(ec_transaction); |
459 | ||
fe955682 | 460 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
461 | { |
462 | struct acpi_ec *ec = first_ec; | |
463 | ||
464 | if (!ec) | |
465 | return; | |
466 | ||
467 | mutex_lock(&ec->lock); | |
468 | /* Prevent transactions from being carried out */ | |
fe955682 | 469 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
470 | mutex_unlock(&ec->lock); |
471 | } | |
472 | ||
fe955682 | 473 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
474 | { |
475 | struct acpi_ec *ec = first_ec; | |
476 | ||
477 | if (!ec) | |
478 | return; | |
479 | ||
480 | mutex_lock(&ec->lock); | |
481 | /* Allow transactions to be carried out again */ | |
fe955682 | 482 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
483 | mutex_unlock(&ec->lock); |
484 | } | |
485 | ||
fe955682 | 486 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
487 | { |
488 | /* | |
489 | * Allow transactions to happen again (this function is called from | |
490 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
491 | */ | |
492 | if (first_ec) | |
fe955682 | 493 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
494 | } |
495 | ||
a62e8f19 | 496 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
497 | { |
498 | int result; | |
6ccedb10 | 499 | u8 d; |
8463200a AS |
500 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
501 | .wdata = NULL, .rdata = &d, | |
502 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
503 | if (!ec || !data) |
504 | return -EINVAL; | |
6ccedb10 AS |
505 | /* |
506 | * Query the EC to find out which _Qxx method we need to evaluate. | |
507 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
508 | * bit to be cleared (and thus clearing the interrupt source). | |
509 | */ | |
a62e8f19 | 510 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
511 | if (result) |
512 | return result; | |
6ccedb10 AS |
513 | if (!d) |
514 | return -ENODATA; | |
6ccedb10 AS |
515 | *data = d; |
516 | return 0; | |
1da177e4 LT |
517 | } |
518 | ||
1da177e4 LT |
519 | /* -------------------------------------------------------------------------- |
520 | Event Management | |
521 | -------------------------------------------------------------------------- */ | |
837012ed AS |
522 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
523 | acpi_handle handle, acpi_ec_query_func func, | |
524 | void *data) | |
525 | { | |
526 | struct acpi_ec_query_handler *handler = | |
527 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
528 | if (!handler) | |
529 | return -ENOMEM; | |
530 | ||
531 | handler->query_bit = query_bit; | |
532 | handler->handle = handle; | |
533 | handler->func = func; | |
534 | handler->data = data; | |
535 | mutex_lock(&ec->lock); | |
30c08574 | 536 | list_add(&handler->node, &ec->list); |
837012ed AS |
537 | mutex_unlock(&ec->lock); |
538 | return 0; | |
539 | } | |
540 | ||
541 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
542 | ||
543 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
544 | { | |
1544fdbc | 545 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 546 | mutex_lock(&ec->lock); |
1544fdbc | 547 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
548 | if (query_bit == handler->query_bit) { |
549 | list_del(&handler->node); | |
550 | kfree(handler); | |
837012ed AS |
551 | } |
552 | } | |
553 | mutex_unlock(&ec->lock); | |
554 | } | |
555 | ||
556 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 557 | |
a62e8f19 | 558 | static void acpi_ec_run(void *cxt) |
45bea155 | 559 | { |
a62e8f19 AS |
560 | struct acpi_ec_query_handler *handler = cxt; |
561 | if (!handler) | |
e41334c0 | 562 | return; |
a62e8f19 AS |
563 | pr_debug(PREFIX "start query execution\n"); |
564 | if (handler->func) | |
565 | handler->func(handler->data); | |
566 | else if (handler->handle) | |
567 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
568 | pr_debug(PREFIX "stop query execution\n"); | |
569 | kfree(handler); | |
570 | } | |
571 | ||
572 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
573 | { | |
574 | u8 value = 0; | |
575 | int status; | |
576 | struct acpi_ec_query_handler *handler, *copy; | |
577 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
578 | return status; | |
837012ed AS |
579 | list_for_each_entry(handler, &ec->list, node) { |
580 | if (value == handler->query_bit) { | |
581 | /* have custom handler for this bit */ | |
a62e8f19 AS |
582 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
583 | if (!copy) | |
584 | return -ENOMEM; | |
585 | memcpy(copy, handler, sizeof(*copy)); | |
586 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
587 | return acpi_os_execute((copy->func) ? |
588 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 589 | acpi_ec_run, copy); |
837012ed AS |
590 | } |
591 | } | |
a62e8f19 AS |
592 | return 0; |
593 | } | |
594 | ||
595 | static void acpi_ec_gpe_query(void *ec_cxt) | |
596 | { | |
597 | struct acpi_ec *ec = ec_cxt; | |
598 | if (!ec) | |
599 | return; | |
600 | mutex_lock(&ec->lock); | |
601 | acpi_ec_sync_query(ec); | |
837012ed | 602 | mutex_unlock(&ec->lock); |
45bea155 | 603 | } |
1da177e4 | 604 | |
a62e8f19 AS |
605 | static void acpi_ec_gpe_query(void *ec_cxt); |
606 | ||
607 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
608 | { | |
609 | if (state & ACPI_EC_FLAG_SCI) { | |
610 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
611 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
612 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
613 | acpi_ec_gpe_query, ec); | |
614 | } | |
615 | } | |
616 | return 0; | |
617 | } | |
618 | ||
50526df6 | 619 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 620 | { |
3d02b90b | 621 | struct acpi_ec *ec = data; |
00eb43a1 | 622 | |
3ebe08a7 | 623 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 624 | |
a62e8f19 AS |
625 | advance_transaction(ec, acpi_ec_read_status(ec)); |
626 | if (ec_transaction_done(ec) && | |
627 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 628 | wake_up(&ec->wait); |
a62e8f19 AS |
629 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
630 | } | |
7c6db4e0 | 631 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
632 | } |
633 | ||
1da177e4 LT |
634 | /* -------------------------------------------------------------------------- |
635 | Address Space Management | |
636 | -------------------------------------------------------------------------- */ | |
637 | ||
1da177e4 | 638 | static acpi_status |
5b7734b4 | 639 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 640 | u32 bits, u64 *value64, |
50526df6 | 641 | void *handler_context, void *region_context) |
1da177e4 | 642 | { |
3d02b90b | 643 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
644 | int result = 0, i, bytes = bits / 8; |
645 | u8 *value = (u8 *)value64; | |
1da177e4 | 646 | |
1da177e4 | 647 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 648 | return AE_BAD_PARAMETER; |
1da177e4 | 649 | |
5b7734b4 | 650 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 651 | return AE_BAD_PARAMETER; |
1da177e4 | 652 | |
dadf28a1 | 653 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 654 | acpi_ec_burst_enable(ec); |
b3b233c7 | 655 | |
dadf28a1 AS |
656 | for (i = 0; i < bytes; ++i, ++address, ++value) |
657 | result = (function == ACPI_READ) ? | |
658 | acpi_ec_read(ec, address, value) : | |
659 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 660 | |
dadf28a1 | 661 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 662 | acpi_ec_burst_disable(ec); |
b3b233c7 | 663 | |
1da177e4 LT |
664 | switch (result) { |
665 | case -EINVAL: | |
d550d98d | 666 | return AE_BAD_PARAMETER; |
1da177e4 LT |
667 | break; |
668 | case -ENODEV: | |
d550d98d | 669 | return AE_NOT_FOUND; |
1da177e4 LT |
670 | break; |
671 | case -ETIME: | |
d550d98d | 672 | return AE_TIME; |
1da177e4 LT |
673 | break; |
674 | default: | |
d550d98d | 675 | return AE_OK; |
1da177e4 | 676 | } |
1da177e4 LT |
677 | } |
678 | ||
1da177e4 LT |
679 | /* -------------------------------------------------------------------------- |
680 | Driver Interface | |
681 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
682 | static acpi_status |
683 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
684 | ||
c0900c35 AS |
685 | static struct acpi_ec *make_acpi_ec(void) |
686 | { | |
687 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
688 | if (!ec) | |
689 | return NULL; | |
080e412c | 690 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
691 | mutex_init(&ec->lock); |
692 | init_waitqueue_head(&ec->wait); | |
837012ed | 693 | INIT_LIST_HEAD(&ec->list); |
8463200a | 694 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
695 | return ec; |
696 | } | |
837012ed | 697 | |
c019b193 AS |
698 | static acpi_status |
699 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
700 | void *context, void **return_value) | |
701 | { | |
0175d562 LM |
702 | char node_name[5]; |
703 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
704 | struct acpi_ec *ec = context; |
705 | int value = 0; | |
0175d562 LM |
706 | acpi_status status; |
707 | ||
708 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
709 | ||
710 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
711 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
712 | } | |
713 | return AE_OK; | |
714 | } | |
715 | ||
cd8c93a4 AS |
716 | static acpi_status |
717 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 718 | { |
cd8c93a4 | 719 | acpi_status status; |
d21cf3c1 | 720 | unsigned long long tmp = 0; |
cd8c93a4 AS |
721 | |
722 | struct acpi_ec *ec = context; | |
a5032bfd AS |
723 | |
724 | /* clear addr values, ec_parse_io_ports depend on it */ | |
725 | ec->command_addr = ec->data_addr = 0; | |
726 | ||
cd8c93a4 AS |
727 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
728 | ec_parse_io_ports, ec); | |
729 | if (ACPI_FAILURE(status)) | |
730 | return status; | |
837012ed AS |
731 | |
732 | /* Get GPE bit assignment (EC events). */ | |
733 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 734 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
735 | if (ACPI_FAILURE(status)) |
736 | return status; | |
27663c58 | 737 | ec->gpe = tmp; |
837012ed | 738 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 739 | tmp = 0; |
27663c58 MW |
740 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
741 | ec->global_lock = tmp; | |
837012ed | 742 | ec->handle = handle; |
cd8c93a4 | 743 | return AE_CTRL_TERMINATE; |
837012ed AS |
744 | } |
745 | ||
5efc5476 BH |
746 | static int ec_install_handlers(struct acpi_ec *ec) |
747 | { | |
748 | acpi_status status; | |
749 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
750 | return 0; | |
751 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
752 | ACPI_GPE_EDGE_TRIGGERED, | |
753 | &acpi_ec_gpe_handler, ec); | |
754 | if (ACPI_FAILURE(status)) | |
755 | return -ENODEV; | |
9630bdd9 RW |
756 | |
757 | acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
5efc5476 BH |
758 | status = acpi_install_address_space_handler(ec->handle, |
759 | ACPI_ADR_SPACE_EC, | |
760 | &acpi_ec_space_handler, | |
761 | NULL, ec); | |
762 | if (ACPI_FAILURE(status)) { | |
763 | if (status == AE_NOT_FOUND) { | |
764 | /* | |
765 | * Maybe OS fails in evaluating the _REG object. | |
766 | * The AE_NOT_FOUND error will be ignored and OS | |
767 | * continue to initialize EC. | |
768 | */ | |
769 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
770 | " of EC device. Broken bios is suspected.\n"); | |
771 | } else { | |
772 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
773 | &acpi_ec_gpe_handler); | |
9630bdd9 | 774 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
5efc5476 BH |
775 | return -ENODEV; |
776 | } | |
777 | } | |
778 | ||
779 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
780 | return 0; | |
781 | } | |
782 | ||
4c611060 AS |
783 | static void ec_remove_handlers(struct acpi_ec *ec) |
784 | { | |
9630bdd9 | 785 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
4c611060 AS |
786 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
787 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 788 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
789 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
790 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 791 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 792 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
793 | } |
794 | ||
703959d4 | 795 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 796 | { |
703959d4 | 797 | struct acpi_ec *ec = NULL; |
d02be047 | 798 | int ret; |
45bea155 | 799 | |
c0900c35 AS |
800 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
801 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
802 | ||
4c611060 | 803 | /* Check for boot EC */ |
ce52ddf5 AS |
804 | if (boot_ec && |
805 | (boot_ec->handle == device->handle || | |
806 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
807 | ec = boot_ec; | |
808 | boot_ec = NULL; | |
809 | } else { | |
810 | ec = make_acpi_ec(); | |
811 | if (!ec) | |
812 | return -ENOMEM; | |
a5032bfd AS |
813 | } |
814 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
815 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
816 | kfree(ec); |
817 | return -EINVAL; | |
4c611060 AS |
818 | } |
819 | ||
c0900c35 | 820 | ec->handle = device->handle; |
ce52ddf5 AS |
821 | |
822 | /* Find and register all query methods */ | |
823 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 824 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 825 | |
4c611060 AS |
826 | if (!first_ec) |
827 | first_ec = ec; | |
db89b4f0 | 828 | device->driver_data = ec; |
3ebe08a7 | 829 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 830 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
831 | |
832 | ret = ec_install_handlers(ec); | |
833 | ||
834 | /* EC is fully operational, allow queries */ | |
835 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
836 | return ret; | |
1da177e4 LT |
837 | } |
838 | ||
50526df6 | 839 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 840 | { |
01f22462 | 841 | struct acpi_ec *ec; |
07ddf768 | 842 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 843 | |
1da177e4 | 844 | if (!device) |
d550d98d | 845 | return -EINVAL; |
1da177e4 LT |
846 | |
847 | ec = acpi_driver_data(device); | |
cf745ec7 | 848 | ec_remove_handlers(ec); |
837012ed | 849 | mutex_lock(&ec->lock); |
07ddf768 | 850 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
851 | list_del(&handler->node); |
852 | kfree(handler); | |
853 | } | |
854 | mutex_unlock(&ec->lock); | |
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 | */ | |
01f22462 | 875 | if (ec->data_addr == 0) |
6ffb221a | 876 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 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 */ |