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 | 85 | |
7a18e96d TR |
86 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
87 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
88 | module_param(ec_delay, uint, 0644); | |
89 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
90 | ||
6ffb221a | 91 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
d033879c | 92 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
93 | typedef int (*acpi_ec_query_func) (void *data); |
94 | ||
95 | struct acpi_ec_query_handler { | |
96 | struct list_head node; | |
97 | acpi_ec_query_func func; | |
98 | acpi_handle handle; | |
99 | void *data; | |
100 | u8 query_bit; | |
101 | }; | |
102 | ||
8463200a | 103 | struct transaction { |
7c6db4e0 AS |
104 | const u8 *wdata; |
105 | u8 *rdata; | |
106 | unsigned short irq_count; | |
8463200a | 107 | u8 command; |
a2f93aea AS |
108 | u8 wi; |
109 | u8 ri; | |
7c6db4e0 AS |
110 | u8 wlen; |
111 | u8 rlen; | |
dd15f8c4 | 112 | bool done; |
7c6db4e0 AS |
113 | }; |
114 | ||
1195a098 TR |
115 | struct acpi_ec *boot_ec, *first_ec; |
116 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 117 | |
5423a0cb | 118 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 119 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 120 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 121 | |
1da177e4 LT |
122 | /* -------------------------------------------------------------------------- |
123 | Transaction Management | |
124 | -------------------------------------------------------------------------- */ | |
125 | ||
6ffb221a | 126 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 127 | { |
3ebe08a7 | 128 | u8 x = inb(ec->command_addr); |
86dae015 | 129 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 130 | return x; |
451566f4 DT |
131 | } |
132 | ||
6ffb221a | 133 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 134 | { |
3ebe08a7 | 135 | u8 x = inb(ec->data_addr); |
86dae015 | 136 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 137 | return x; |
7c6db5e5 DS |
138 | } |
139 | ||
6ffb221a | 140 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 141 | { |
86dae015 | 142 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 143 | outb(command, ec->command_addr); |
45bea155 LY |
144 | } |
145 | ||
6ffb221a | 146 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 147 | { |
86dae015 | 148 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 149 | outb(data, ec->data_addr); |
703959d4 | 150 | } |
45bea155 | 151 | |
7c6db4e0 | 152 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 153 | { |
7c6db4e0 AS |
154 | unsigned long flags; |
155 | int ret = 0; | |
8463200a | 156 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 157 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 158 | ret = 1; |
8463200a | 159 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 160 | return ret; |
45bea155 | 161 | } |
451566f4 | 162 | |
a2f93aea AS |
163 | static void start_transaction(struct acpi_ec *ec) |
164 | { | |
165 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
166 | ec->curr->done = false; | |
167 | acpi_ec_write_cmd(ec, ec->curr->command); | |
168 | } | |
169 | ||
2a84cb98 | 170 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 171 | { |
7c6db4e0 | 172 | unsigned long flags; |
8463200a AS |
173 | spin_lock_irqsave(&ec->curr_lock, flags); |
174 | if (!ec->curr) | |
7c6db4e0 | 175 | goto unlock; |
a2f93aea AS |
176 | if (ec->curr->wlen > ec->curr->wi) { |
177 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
178 | acpi_ec_write_data(ec, | |
179 | ec->curr->wdata[ec->curr->wi++]); | |
180 | else | |
dd15f8c4 | 181 | goto err; |
a2f93aea | 182 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 183 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
184 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
185 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 186 | ec->curr->done = true; |
7c6db4e0 | 187 | } else |
dd15f8c4 | 188 | goto err; |
a2f93aea AS |
189 | } else if (ec->curr->wlen == ec->curr->wi && |
190 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
191 | ec->curr->done = true; |
192 | goto unlock; | |
193 | err: | |
194 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
195 | if (in_interrupt()) |
196 | ++ec->curr->irq_count; | |
7c6db4e0 | 197 | unlock: |
8463200a | 198 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 199 | } |
03d1d99c | 200 | |
a62e8f19 | 201 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 202 | |
a62e8f19 | 203 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 204 | { |
7c6db4e0 AS |
205 | if (state & ACPI_EC_FLAG_SCI) { |
206 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 207 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
208 | } |
209 | return 0; | |
210 | } | |
211 | ||
212 | static int ec_poll(struct acpi_ec *ec) | |
213 | { | |
2a84cb98 AS |
214 | unsigned long flags; |
215 | int repeat = 2; /* number of command restarts */ | |
216 | while (repeat--) { | |
217 | unsigned long delay = jiffies + | |
7a18e96d | 218 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
219 | do { |
220 | /* don't sleep with disabled interrupts */ | |
221 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
222 | udelay(ACPI_EC_MSI_UDELAY); | |
223 | if (ec_transaction_done(ec)) | |
224 | return 0; | |
225 | } else { | |
226 | if (wait_event_timeout(ec->wait, | |
227 | ec_transaction_done(ec), | |
228 | msecs_to_jiffies(1))) | |
229 | return 0; | |
230 | } | |
231 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
232 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 233 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 234 | break; |
2a84cb98 AS |
235 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
236 | spin_lock_irqsave(&ec->curr_lock, flags); | |
237 | start_transaction(ec); | |
238 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 239 | } |
b77d81b2 | 240 | return -ETIME; |
1da177e4 LT |
241 | } |
242 | ||
8463200a | 243 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 244 | struct transaction *t) |
45bea155 | 245 | { |
7c6db4e0 | 246 | unsigned long tmp; |
7c6db4e0 | 247 | int ret = 0; |
5423a0cb | 248 | if (EC_FLAGS_MSI) |
2a84cb98 | 249 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 250 | /* start transaction */ |
8463200a | 251 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 252 | /* following two actions should be kept atomic */ |
8463200a | 253 | ec->curr = t; |
a2f93aea | 254 | start_transaction(ec); |
8463200a | 255 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 256 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 257 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 258 | ret = ec_poll(ec); |
8463200a AS |
259 | spin_lock_irqsave(&ec->curr_lock, tmp); |
260 | ec->curr = NULL; | |
261 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
262 | return ret; |
263 | } | |
264 | ||
265 | static int ec_check_ibf0(struct acpi_ec *ec) | |
266 | { | |
267 | u8 status = acpi_ec_read_status(ec); | |
268 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
269 | } |
270 | ||
c0ff1772 AS |
271 | static int ec_wait_ibf0(struct acpi_ec *ec) |
272 | { | |
7a18e96d | 273 | unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); |
c0ff1772 | 274 | /* interrupt wait manually if GPE mode is not active */ |
c0ff1772 | 275 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
276 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
277 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
278 | return 0; |
279 | return -ETIME; | |
45bea155 LY |
280 | } |
281 | ||
2a84cb98 | 282 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 283 | { |
d7a76e4c | 284 | int status; |
50526df6 | 285 | u32 glk; |
8463200a | 286 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 287 | return -EINVAL; |
8463200a AS |
288 | if (t->rdata) |
289 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 290 | mutex_lock(&ec->lock); |
fe955682 | 291 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
292 | status = -EINVAL; |
293 | goto unlock; | |
294 | } | |
703959d4 | 295 | if (ec->global_lock) { |
1da177e4 | 296 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 297 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
298 | status = -ENODEV; |
299 | goto unlock; | |
c24e912b | 300 | } |
1da177e4 | 301 | } |
c0ff1772 | 302 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
303 | pr_err(PREFIX "input buffer is not empty, " |
304 | "aborting transaction\n"); | |
7c6db4e0 | 305 | status = -ETIME; |
451566f4 | 306 | goto end; |
716e084e | 307 | } |
a62e8f19 AS |
308 | pr_debug(PREFIX "transaction start\n"); |
309 | /* disable GPE during transaction if storm is detected */ | |
310 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
311 | /* It has to be disabled, so that it doesn't trigger. */ |
312 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
313 | } |
314 | ||
2a84cb98 | 315 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
316 | |
317 | /* check if we received SCI during transaction */ | |
318 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
319 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 320 | msleep(1); |
3784730b RW |
321 | /* It is safe to enable the GPE outside of the transaction. */ |
322 | acpi_enable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
323 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
324 | pr_info(PREFIX "GPE storm detected, " | |
325 | "transactions will use polling mode\n"); | |
326 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
327 | } | |
54070101 | 328 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 329 | end: |
703959d4 | 330 | if (ec->global_lock) |
1da177e4 | 331 | acpi_release_global_lock(glk); |
7c6db4e0 | 332 | unlock: |
523953b4 | 333 | mutex_unlock(&ec->lock); |
d550d98d | 334 | return status; |
1da177e4 LT |
335 | } |
336 | ||
8a383ef0 | 337 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
338 | { |
339 | u8 d; | |
8463200a AS |
340 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
341 | .wdata = NULL, .rdata = &d, | |
342 | .wlen = 0, .rlen = 1}; | |
343 | ||
2a84cb98 | 344 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
345 | } |
346 | ||
8a383ef0 | 347 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 348 | { |
8463200a AS |
349 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
350 | .wdata = NULL, .rdata = NULL, | |
351 | .wlen = 0, .rlen = 0}; | |
352 | ||
7c6db4e0 | 353 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 354 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
355 | } |
356 | ||
6ccedb10 | 357 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
358 | { |
359 | int result; | |
360 | u8 d; | |
8463200a AS |
361 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
362 | .wdata = &address, .rdata = &d, | |
363 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 364 | |
2a84cb98 | 365 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
366 | *data = d; |
367 | return result; | |
368 | } | |
6ffb221a | 369 | |
3576cf61 DS |
370 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
371 | { | |
6ccedb10 | 372 | u8 wdata[2] = { address, data }; |
8463200a AS |
373 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
374 | .wdata = wdata, .rdata = NULL, | |
375 | .wlen = 2, .rlen = 0}; | |
376 | ||
2a84cb98 | 377 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
378 | } |
379 | ||
1da177e4 LT |
380 | /* |
381 | * Externally callable EC access functions. For now, assume 1 EC only | |
382 | */ | |
c45aac43 AS |
383 | int ec_burst_enable(void) |
384 | { | |
c45aac43 AS |
385 | if (!first_ec) |
386 | return -ENODEV; | |
d033879c | 387 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
388 | } |
389 | ||
390 | EXPORT_SYMBOL(ec_burst_enable); | |
391 | ||
392 | int ec_burst_disable(void) | |
393 | { | |
c45aac43 AS |
394 | if (!first_ec) |
395 | return -ENODEV; | |
d033879c | 396 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
397 | } |
398 | ||
399 | EXPORT_SYMBOL(ec_burst_disable); | |
400 | ||
6ccedb10 | 401 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 402 | { |
1da177e4 | 403 | int err; |
6ffb221a | 404 | u8 temp_data; |
1da177e4 LT |
405 | |
406 | if (!first_ec) | |
407 | return -ENODEV; | |
408 | ||
d033879c | 409 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
410 | |
411 | if (!err) { | |
412 | *val = temp_data; | |
413 | return 0; | |
50526df6 | 414 | } else |
1da177e4 LT |
415 | return err; |
416 | } | |
50526df6 | 417 | |
1da177e4 LT |
418 | EXPORT_SYMBOL(ec_read); |
419 | ||
50526df6 | 420 | int ec_write(u8 addr, u8 val) |
1da177e4 | 421 | { |
1da177e4 LT |
422 | int err; |
423 | ||
424 | if (!first_ec) | |
425 | return -ENODEV; | |
426 | ||
d033879c | 427 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
428 | |
429 | return err; | |
430 | } | |
50526df6 | 431 | |
1da177e4 LT |
432 | EXPORT_SYMBOL(ec_write); |
433 | ||
616362de | 434 | int ec_transaction(u8 command, |
9e197219 | 435 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
436 | u8 * rdata, unsigned rdata_len, |
437 | int force_poll) | |
45bea155 | 438 | { |
8463200a AS |
439 | struct transaction t = {.command = command, |
440 | .wdata = wdata, .rdata = rdata, | |
441 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
442 | if (!first_ec) |
443 | return -ENODEV; | |
45bea155 | 444 | |
2a84cb98 | 445 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 446 | } |
1da177e4 | 447 | |
ab9e43c6 LP |
448 | EXPORT_SYMBOL(ec_transaction); |
449 | ||
fe955682 | 450 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
451 | { |
452 | struct acpi_ec *ec = first_ec; | |
453 | ||
454 | if (!ec) | |
455 | return; | |
456 | ||
457 | mutex_lock(&ec->lock); | |
458 | /* Prevent transactions from being carried out */ | |
fe955682 | 459 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
460 | mutex_unlock(&ec->lock); |
461 | } | |
462 | ||
fe955682 | 463 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
464 | { |
465 | struct acpi_ec *ec = first_ec; | |
466 | ||
467 | if (!ec) | |
468 | return; | |
469 | ||
470 | mutex_lock(&ec->lock); | |
471 | /* Allow transactions to be carried out again */ | |
fe955682 | 472 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f6bb13aa RW |
473 | mutex_unlock(&ec->lock); |
474 | } | |
475 | ||
fe955682 | 476 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
477 | { |
478 | /* | |
479 | * Allow transactions to happen again (this function is called from | |
480 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
481 | */ | |
482 | if (first_ec) | |
fe955682 | 483 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
484 | } |
485 | ||
a62e8f19 | 486 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
487 | { |
488 | int result; | |
6ccedb10 | 489 | u8 d; |
8463200a AS |
490 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
491 | .wdata = NULL, .rdata = &d, | |
492 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
493 | if (!ec || !data) |
494 | return -EINVAL; | |
6ccedb10 AS |
495 | /* |
496 | * Query the EC to find out which _Qxx method we need to evaluate. | |
497 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
498 | * bit to be cleared (and thus clearing the interrupt source). | |
499 | */ | |
a62e8f19 | 500 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
501 | if (result) |
502 | return result; | |
6ccedb10 AS |
503 | if (!d) |
504 | return -ENODATA; | |
6ccedb10 AS |
505 | *data = d; |
506 | return 0; | |
1da177e4 LT |
507 | } |
508 | ||
1da177e4 LT |
509 | /* -------------------------------------------------------------------------- |
510 | Event Management | |
511 | -------------------------------------------------------------------------- */ | |
837012ed AS |
512 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
513 | acpi_handle handle, acpi_ec_query_func func, | |
514 | void *data) | |
515 | { | |
516 | struct acpi_ec_query_handler *handler = | |
517 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
518 | if (!handler) | |
519 | return -ENOMEM; | |
520 | ||
521 | handler->query_bit = query_bit; | |
522 | handler->handle = handle; | |
523 | handler->func = func; | |
524 | handler->data = data; | |
525 | mutex_lock(&ec->lock); | |
30c08574 | 526 | list_add(&handler->node, &ec->list); |
837012ed AS |
527 | mutex_unlock(&ec->lock); |
528 | return 0; | |
529 | } | |
530 | ||
531 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
532 | ||
533 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
534 | { | |
1544fdbc | 535 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 536 | mutex_lock(&ec->lock); |
1544fdbc | 537 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
538 | if (query_bit == handler->query_bit) { |
539 | list_del(&handler->node); | |
540 | kfree(handler); | |
837012ed AS |
541 | } |
542 | } | |
543 | mutex_unlock(&ec->lock); | |
544 | } | |
545 | ||
546 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 547 | |
a62e8f19 | 548 | static void acpi_ec_run(void *cxt) |
45bea155 | 549 | { |
a62e8f19 AS |
550 | struct acpi_ec_query_handler *handler = cxt; |
551 | if (!handler) | |
e41334c0 | 552 | return; |
a62e8f19 AS |
553 | pr_debug(PREFIX "start query execution\n"); |
554 | if (handler->func) | |
555 | handler->func(handler->data); | |
556 | else if (handler->handle) | |
557 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
558 | pr_debug(PREFIX "stop query execution\n"); | |
559 | kfree(handler); | |
560 | } | |
561 | ||
562 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
563 | { | |
564 | u8 value = 0; | |
565 | int status; | |
566 | struct acpi_ec_query_handler *handler, *copy; | |
567 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
568 | return status; | |
837012ed AS |
569 | list_for_each_entry(handler, &ec->list, node) { |
570 | if (value == handler->query_bit) { | |
571 | /* have custom handler for this bit */ | |
a62e8f19 AS |
572 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
573 | if (!copy) | |
574 | return -ENOMEM; | |
575 | memcpy(copy, handler, sizeof(*copy)); | |
576 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
577 | return acpi_os_execute((copy->func) ? |
578 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 579 | acpi_ec_run, copy); |
837012ed AS |
580 | } |
581 | } | |
a62e8f19 AS |
582 | return 0; |
583 | } | |
584 | ||
585 | static void acpi_ec_gpe_query(void *ec_cxt) | |
586 | { | |
587 | struct acpi_ec *ec = ec_cxt; | |
588 | if (!ec) | |
589 | return; | |
590 | mutex_lock(&ec->lock); | |
591 | acpi_ec_sync_query(ec); | |
837012ed | 592 | mutex_unlock(&ec->lock); |
45bea155 | 593 | } |
1da177e4 | 594 | |
a62e8f19 AS |
595 | static void acpi_ec_gpe_query(void *ec_cxt); |
596 | ||
597 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
598 | { | |
599 | if (state & ACPI_EC_FLAG_SCI) { | |
600 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
601 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
602 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
603 | acpi_ec_gpe_query, ec); | |
604 | } | |
605 | } | |
606 | return 0; | |
607 | } | |
608 | ||
50526df6 | 609 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 610 | { |
3d02b90b | 611 | struct acpi_ec *ec = data; |
00eb43a1 | 612 | |
3ebe08a7 | 613 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 614 | |
a62e8f19 AS |
615 | advance_transaction(ec, acpi_ec_read_status(ec)); |
616 | if (ec_transaction_done(ec) && | |
617 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 618 | wake_up(&ec->wait); |
a62e8f19 AS |
619 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
620 | } | |
7c6db4e0 | 621 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
622 | } |
623 | ||
1da177e4 LT |
624 | /* -------------------------------------------------------------------------- |
625 | Address Space Management | |
626 | -------------------------------------------------------------------------- */ | |
627 | ||
1da177e4 | 628 | static acpi_status |
5b7734b4 | 629 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 630 | u32 bits, u64 *value64, |
50526df6 | 631 | void *handler_context, void *region_context) |
1da177e4 | 632 | { |
3d02b90b | 633 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
634 | int result = 0, i, bytes = bits / 8; |
635 | u8 *value = (u8 *)value64; | |
1da177e4 | 636 | |
1da177e4 | 637 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 638 | return AE_BAD_PARAMETER; |
1da177e4 | 639 | |
5b7734b4 | 640 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 641 | return AE_BAD_PARAMETER; |
1da177e4 | 642 | |
dadf28a1 | 643 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 644 | acpi_ec_burst_enable(ec); |
b3b233c7 | 645 | |
dadf28a1 AS |
646 | for (i = 0; i < bytes; ++i, ++address, ++value) |
647 | result = (function == ACPI_READ) ? | |
648 | acpi_ec_read(ec, address, value) : | |
649 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 650 | |
dadf28a1 | 651 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 652 | acpi_ec_burst_disable(ec); |
b3b233c7 | 653 | |
1da177e4 LT |
654 | switch (result) { |
655 | case -EINVAL: | |
d550d98d | 656 | return AE_BAD_PARAMETER; |
1da177e4 LT |
657 | break; |
658 | case -ENODEV: | |
d550d98d | 659 | return AE_NOT_FOUND; |
1da177e4 LT |
660 | break; |
661 | case -ETIME: | |
d550d98d | 662 | return AE_TIME; |
1da177e4 LT |
663 | break; |
664 | default: | |
d550d98d | 665 | return AE_OK; |
1da177e4 | 666 | } |
1da177e4 LT |
667 | } |
668 | ||
1da177e4 LT |
669 | /* -------------------------------------------------------------------------- |
670 | Driver Interface | |
671 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
672 | static acpi_status |
673 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
674 | ||
c0900c35 AS |
675 | static struct acpi_ec *make_acpi_ec(void) |
676 | { | |
677 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
678 | if (!ec) | |
679 | return NULL; | |
080e412c | 680 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
681 | mutex_init(&ec->lock); |
682 | init_waitqueue_head(&ec->wait); | |
837012ed | 683 | INIT_LIST_HEAD(&ec->list); |
8463200a | 684 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
685 | return ec; |
686 | } | |
837012ed | 687 | |
c019b193 AS |
688 | static acpi_status |
689 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
690 | void *context, void **return_value) | |
691 | { | |
0175d562 LM |
692 | char node_name[5]; |
693 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
694 | struct acpi_ec *ec = context; |
695 | int value = 0; | |
0175d562 LM |
696 | acpi_status status; |
697 | ||
698 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
699 | ||
700 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
701 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
702 | } | |
703 | return AE_OK; | |
704 | } | |
705 | ||
cd8c93a4 AS |
706 | static acpi_status |
707 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 708 | { |
cd8c93a4 | 709 | acpi_status status; |
d21cf3c1 | 710 | unsigned long long tmp = 0; |
cd8c93a4 AS |
711 | |
712 | struct acpi_ec *ec = context; | |
a5032bfd AS |
713 | |
714 | /* clear addr values, ec_parse_io_ports depend on it */ | |
715 | ec->command_addr = ec->data_addr = 0; | |
716 | ||
cd8c93a4 AS |
717 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
718 | ec_parse_io_ports, ec); | |
719 | if (ACPI_FAILURE(status)) | |
720 | return status; | |
837012ed AS |
721 | |
722 | /* Get GPE bit assignment (EC events). */ | |
723 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 724 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
725 | if (ACPI_FAILURE(status)) |
726 | return status; | |
27663c58 | 727 | ec->gpe = tmp; |
837012ed | 728 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 729 | tmp = 0; |
27663c58 MW |
730 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
731 | ec->global_lock = tmp; | |
837012ed | 732 | ec->handle = handle; |
cd8c93a4 | 733 | return AE_CTRL_TERMINATE; |
837012ed AS |
734 | } |
735 | ||
5efc5476 BH |
736 | static int ec_install_handlers(struct acpi_ec *ec) |
737 | { | |
738 | acpi_status status; | |
739 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
740 | return 0; | |
741 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
742 | ACPI_GPE_EDGE_TRIGGERED, | |
743 | &acpi_ec_gpe_handler, ec); | |
744 | if (ACPI_FAILURE(status)) | |
745 | return -ENODEV; | |
9630bdd9 | 746 | |
a44061aa | 747 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
748 | status = acpi_install_address_space_handler(ec->handle, |
749 | ACPI_ADR_SPACE_EC, | |
750 | &acpi_ec_space_handler, | |
751 | NULL, ec); | |
752 | if (ACPI_FAILURE(status)) { | |
753 | if (status == AE_NOT_FOUND) { | |
754 | /* | |
755 | * Maybe OS fails in evaluating the _REG object. | |
756 | * The AE_NOT_FOUND error will be ignored and OS | |
757 | * continue to initialize EC. | |
758 | */ | |
759 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
760 | " of EC device. Broken bios is suspected.\n"); | |
761 | } else { | |
762 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
763 | &acpi_ec_gpe_handler); | |
a44061aa | 764 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
765 | return -ENODEV; |
766 | } | |
767 | } | |
768 | ||
769 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
770 | return 0; | |
771 | } | |
772 | ||
4c611060 AS |
773 | static void ec_remove_handlers(struct acpi_ec *ec) |
774 | { | |
a44061aa | 775 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
776 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
777 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 778 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
779 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
780 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 781 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 782 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
783 | } |
784 | ||
703959d4 | 785 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 786 | { |
703959d4 | 787 | struct acpi_ec *ec = NULL; |
d02be047 | 788 | int ret; |
45bea155 | 789 | |
c0900c35 AS |
790 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
791 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
792 | ||
4c611060 | 793 | /* Check for boot EC */ |
ce52ddf5 AS |
794 | if (boot_ec && |
795 | (boot_ec->handle == device->handle || | |
796 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
797 | ec = boot_ec; | |
798 | boot_ec = NULL; | |
799 | } else { | |
800 | ec = make_acpi_ec(); | |
801 | if (!ec) | |
802 | return -ENOMEM; | |
a5032bfd AS |
803 | } |
804 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
805 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
806 | kfree(ec); |
807 | return -EINVAL; | |
4c611060 AS |
808 | } |
809 | ||
c0900c35 | 810 | ec->handle = device->handle; |
ce52ddf5 AS |
811 | |
812 | /* Find and register all query methods */ | |
813 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 814 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 815 | |
4c611060 AS |
816 | if (!first_ec) |
817 | first_ec = ec; | |
db89b4f0 | 818 | device->driver_data = ec; |
de4f1046 TR |
819 | |
820 | WARN(!request_region(ec->data_addr, 1, "EC data"), | |
821 | "Could not request EC data io port 0x%lx", ec->data_addr); | |
822 | WARN(!request_region(ec->command_addr, 1, "EC cmd"), | |
823 | "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
824 | ||
3ebe08a7 | 825 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 826 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
827 | |
828 | ret = ec_install_handlers(ec); | |
829 | ||
830 | /* EC is fully operational, allow queries */ | |
831 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
832 | return ret; | |
1da177e4 LT |
833 | } |
834 | ||
50526df6 | 835 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 836 | { |
01f22462 | 837 | struct acpi_ec *ec; |
07ddf768 | 838 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 839 | |
1da177e4 | 840 | if (!device) |
d550d98d | 841 | return -EINVAL; |
1da177e4 LT |
842 | |
843 | ec = acpi_driver_data(device); | |
cf745ec7 | 844 | ec_remove_handlers(ec); |
837012ed | 845 | mutex_lock(&ec->lock); |
07ddf768 | 846 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
847 | list_del(&handler->node); |
848 | kfree(handler); | |
849 | } | |
850 | mutex_unlock(&ec->lock); | |
de4f1046 TR |
851 | release_region(ec->data_addr, 1); |
852 | release_region(ec->command_addr, 1); | |
db89b4f0 | 853 | device->driver_data = NULL; |
d033879c | 854 | if (ec == first_ec) |
c0900c35 | 855 | first_ec = NULL; |
4c611060 | 856 | kfree(ec); |
d550d98d | 857 | return 0; |
1da177e4 LT |
858 | } |
859 | ||
1da177e4 | 860 | static acpi_status |
c0900c35 | 861 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 862 | { |
3d02b90b | 863 | struct acpi_ec *ec = context; |
1da177e4 | 864 | |
01f22462 | 865 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 866 | return AE_OK; |
1da177e4 LT |
867 | |
868 | /* | |
869 | * The first address region returned is the data port, and | |
870 | * the second address region returned is the status/command | |
871 | * port. | |
872 | */ | |
de4f1046 | 873 | if (ec->data_addr == 0) |
6ffb221a | 874 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 875 | else if (ec->command_addr == 0) |
6ffb221a | 876 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 877 | else |
1da177e4 | 878 | return AE_CTRL_TERMINATE; |
1da177e4 | 879 | |
1da177e4 LT |
880 | return AE_OK; |
881 | } | |
882 | ||
c04209a7 AS |
883 | int __init acpi_boot_ec_enable(void) |
884 | { | |
7c6db4e0 | 885 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
886 | return 0; |
887 | if (!ec_install_handlers(boot_ec)) { | |
888 | first_ec = boot_ec; | |
889 | return 0; | |
890 | } | |
891 | return -EFAULT; | |
892 | } | |
893 | ||
223883b7 AS |
894 | static const struct acpi_device_id ec_device_ids[] = { |
895 | {"PNP0C09", 0}, | |
896 | {"", 0}, | |
897 | }; | |
898 | ||
478fa03b AS |
899 | /* Some BIOS do not survive early DSDT scan, skip it */ |
900 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
901 | { | |
902 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
903 | return 0; | |
904 | } | |
905 | ||
0adf3c74 AS |
906 | /* ASUStek often supplies us with broken ECDT, validate it */ |
907 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
908 | { | |
909 | EC_FLAGS_VALIDATE_ECDT = 1; | |
910 | return 0; | |
911 | } | |
912 | ||
913 | /* MSI EC needs special treatment, enable it */ | |
914 | static int ec_flag_msi(const struct dmi_system_id *id) | |
915 | { | |
55b313f2 | 916 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
917 | EC_FLAGS_MSI = 1; |
918 | EC_FLAGS_VALIDATE_ECDT = 1; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
923 | { |
924 | ec_skip_dsdt_scan, "Compal JFL92", { | |
925 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
926 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
927 | { |
928 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
929 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
930 | { | |
931 | ec_flag_msi, "MSI hardware", { | |
932 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
933 | { | |
934 | ec_flag_msi, "MSI hardware", { | |
935 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 AS |
936 | { |
937 | ec_validate_ecdt, "ASUS hardware", { | |
938 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
939 | {}, | |
940 | }; | |
941 | ||
942 | ||
c0900c35 AS |
943 | int __init acpi_ec_ecdt_probe(void) |
944 | { | |
c0900c35 | 945 | acpi_status status; |
c6cb0e87 | 946 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 947 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 948 | |
d66d969d AS |
949 | boot_ec = make_acpi_ec(); |
950 | if (!boot_ec) | |
c0900c35 AS |
951 | return -ENOMEM; |
952 | /* | |
953 | * Generate a boot ec context | |
954 | */ | |
0adf3c74 | 955 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
956 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
957 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 958 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 959 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
960 | boot_ec->command_addr = ecdt_ptr->control.address; |
961 | boot_ec->data_addr = ecdt_ptr->data.address; | |
962 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 963 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 964 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 965 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 966 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 967 | goto install; |
d6bd535d | 968 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
969 | if (!saved_ec) |
970 | return -ENOMEM; | |
c5279dee | 971 | /* fall through */ |
cd8c93a4 | 972 | } |
0adf3c74 | 973 | |
478fa03b AS |
974 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
975 | return -ENODEV; | |
976 | ||
c5279dee AS |
977 | /* This workaround is needed only on some broken machines, |
978 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
979 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
980 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
981 | boot_ec, NULL); | |
982 | /* Check that acpi_get_devices actually find something */ | |
983 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
984 | goto error; | |
c6cb0e87 AS |
985 | if (saved_ec) { |
986 | /* try to find good ECDT from ASUSTek */ | |
987 | if (saved_ec->command_addr != boot_ec->command_addr || | |
988 | saved_ec->data_addr != boot_ec->data_addr || | |
989 | saved_ec->gpe != boot_ec->gpe || | |
990 | saved_ec->handle != boot_ec->handle) | |
991 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
992 | "ECDT tables, which are very hard to workaround. " | |
993 | "Trying to use DSDT EC info instead. Please send " | |
994 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
995 | kfree(saved_ec); | |
996 | saved_ec = NULL; | |
997 | } else { | |
998 | /* We really need to limit this workaround, the only ASUS, | |
999 | * which needs it, has fake EC._INI method, so use it as flag. | |
1000 | * Keep boot_ec struct as it will be needed soon. | |
1001 | */ | |
1002 | acpi_handle dummy; | |
1003 | if (!dmi_name_in_vendors("ASUS") || | |
1004 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1005 | &dummy))) | |
1006 | return -ENODEV; | |
1007 | } | |
c5279dee AS |
1008 | install: |
1009 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1010 | first_ec = boot_ec; |
e8284321 | 1011 | return 0; |
d033879c | 1012 | } |
c5279dee | 1013 | error: |
d66d969d AS |
1014 | kfree(boot_ec); |
1015 | boot_ec = NULL; | |
1da177e4 LT |
1016 | return -ENODEV; |
1017 | } | |
1018 | ||
223883b7 AS |
1019 | static struct acpi_driver acpi_ec_driver = { |
1020 | .name = "ec", | |
1021 | .class = ACPI_EC_CLASS, | |
1022 | .ids = ec_device_ids, | |
1023 | .ops = { | |
1024 | .add = acpi_ec_add, | |
1025 | .remove = acpi_ec_remove, | |
223883b7 AS |
1026 | }, |
1027 | }; | |
1028 | ||
a5f820fe | 1029 | int __init acpi_ec_init(void) |
1da177e4 | 1030 | { |
50526df6 | 1031 | int result = 0; |
1da177e4 | 1032 | |
1da177e4 LT |
1033 | /* Now register the driver for the EC */ |
1034 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1035 | if (result < 0) |
d550d98d | 1036 | return -ENODEV; |
1da177e4 | 1037 | |
d550d98d | 1038 | return result; |
1da177e4 LT |
1039 | } |
1040 | ||
1da177e4 LT |
1041 | /* EC driver currently not unloadable */ |
1042 | #if 0 | |
50526df6 | 1043 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1044 | { |
1da177e4 LT |
1045 | |
1046 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1047 | return; |
1da177e4 | 1048 | } |
7843932a | 1049 | #endif /* 0 */ |