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 */ |
2a84cb98 | 72 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 73 | |
080e412c | 74 | enum { |
080e412c | 75 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 76 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 77 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 78 | * OpReg are installed */ |
fe955682 | 79 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 80 | }; |
6ffb221a | 81 | |
7a18e96d TR |
82 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
83 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
84 | module_param(ec_delay, uint, 0644); | |
85 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
86 | ||
a520d52e FT |
87 | /* |
88 | * If the number of false interrupts per one transaction exceeds | |
89 | * this threshold, will think there is a GPE storm happened and | |
90 | * will disable the GPE for normal transaction. | |
91 | */ | |
92 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
93 | module_param(ec_storm_threshold, uint, 0644); | |
94 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
95 | ||
6ffb221a | 96 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
d033879c | 97 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
98 | typedef int (*acpi_ec_query_func) (void *data); |
99 | ||
100 | struct acpi_ec_query_handler { | |
101 | struct list_head node; | |
102 | acpi_ec_query_func func; | |
103 | acpi_handle handle; | |
104 | void *data; | |
105 | u8 query_bit; | |
106 | }; | |
107 | ||
8463200a | 108 | struct transaction { |
7c6db4e0 AS |
109 | const u8 *wdata; |
110 | u8 *rdata; | |
111 | unsigned short irq_count; | |
8463200a | 112 | u8 command; |
a2f93aea AS |
113 | u8 wi; |
114 | u8 ri; | |
7c6db4e0 AS |
115 | u8 wlen; |
116 | u8 rlen; | |
dd15f8c4 | 117 | bool done; |
7c6db4e0 AS |
118 | }; |
119 | ||
1195a098 TR |
120 | struct acpi_ec *boot_ec, *first_ec; |
121 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 122 | |
5423a0cb | 123 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 124 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 125 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 126 | |
1da177e4 LT |
127 | /* -------------------------------------------------------------------------- |
128 | Transaction Management | |
129 | -------------------------------------------------------------------------- */ | |
130 | ||
6ffb221a | 131 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 132 | { |
3ebe08a7 | 133 | u8 x = inb(ec->command_addr); |
86dae015 | 134 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 135 | return x; |
451566f4 DT |
136 | } |
137 | ||
6ffb221a | 138 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 139 | { |
3ebe08a7 | 140 | u8 x = inb(ec->data_addr); |
86dae015 | 141 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 142 | return x; |
7c6db5e5 DS |
143 | } |
144 | ||
6ffb221a | 145 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 146 | { |
86dae015 | 147 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 148 | outb(command, ec->command_addr); |
45bea155 LY |
149 | } |
150 | ||
6ffb221a | 151 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 152 | { |
86dae015 | 153 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 154 | outb(data, ec->data_addr); |
703959d4 | 155 | } |
45bea155 | 156 | |
7c6db4e0 | 157 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 158 | { |
7c6db4e0 AS |
159 | unsigned long flags; |
160 | int ret = 0; | |
f351d027 | 161 | spin_lock_irqsave(&ec->lock, flags); |
dd15f8c4 | 162 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 163 | ret = 1; |
f351d027 | 164 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 165 | return ret; |
45bea155 | 166 | } |
451566f4 | 167 | |
a2f93aea AS |
168 | static void start_transaction(struct acpi_ec *ec) |
169 | { | |
170 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
171 | ec->curr->done = false; | |
172 | acpi_ec_write_cmd(ec, ec->curr->command); | |
173 | } | |
174 | ||
2a84cb98 | 175 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 176 | { |
7c6db4e0 | 177 | unsigned long flags; |
f351d027 | 178 | spin_lock_irqsave(&ec->lock, flags); |
8463200a | 179 | if (!ec->curr) |
7c6db4e0 | 180 | goto unlock; |
a2f93aea AS |
181 | if (ec->curr->wlen > ec->curr->wi) { |
182 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
183 | acpi_ec_write_data(ec, | |
184 | ec->curr->wdata[ec->curr->wi++]); | |
185 | else | |
dd15f8c4 | 186 | goto err; |
a2f93aea | 187 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 188 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
189 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
190 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 191 | ec->curr->done = true; |
7c6db4e0 | 192 | } else |
dd15f8c4 | 193 | goto err; |
a2f93aea AS |
194 | } else if (ec->curr->wlen == ec->curr->wi && |
195 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
196 | ec->curr->done = true; |
197 | goto unlock; | |
198 | err: | |
199 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
200 | if (in_interrupt()) |
201 | ++ec->curr->irq_count; | |
7c6db4e0 | 202 | unlock: |
f351d027 | 203 | spin_unlock_irqrestore(&ec->lock, flags); |
845625cd | 204 | } |
03d1d99c | 205 | |
a62e8f19 | 206 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 207 | |
a62e8f19 | 208 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 209 | { |
7c6db4e0 AS |
210 | if (state & ACPI_EC_FLAG_SCI) { |
211 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 212 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
213 | } |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int ec_poll(struct acpi_ec *ec) | |
218 | { | |
2a84cb98 AS |
219 | unsigned long flags; |
220 | int repeat = 2; /* number of command restarts */ | |
221 | while (repeat--) { | |
222 | unsigned long delay = jiffies + | |
7a18e96d | 223 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
224 | do { |
225 | /* don't sleep with disabled interrupts */ | |
226 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
227 | udelay(ACPI_EC_MSI_UDELAY); | |
228 | if (ec_transaction_done(ec)) | |
229 | return 0; | |
230 | } else { | |
231 | if (wait_event_timeout(ec->wait, | |
232 | ec_transaction_done(ec), | |
233 | msecs_to_jiffies(1))) | |
234 | return 0; | |
235 | } | |
236 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
237 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 238 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 239 | break; |
2a84cb98 | 240 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
f351d027 | 241 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 242 | start_transaction(ec); |
f351d027 | 243 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 244 | } |
b77d81b2 | 245 | return -ETIME; |
1da177e4 LT |
246 | } |
247 | ||
8463200a | 248 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 249 | struct transaction *t) |
45bea155 | 250 | { |
7c6db4e0 | 251 | unsigned long tmp; |
7c6db4e0 | 252 | int ret = 0; |
5423a0cb | 253 | if (EC_FLAGS_MSI) |
2a84cb98 | 254 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 255 | /* start transaction */ |
f351d027 | 256 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 257 | /* following two actions should be kept atomic */ |
8463200a | 258 | ec->curr = t; |
a2f93aea | 259 | start_transaction(ec); |
8463200a | 260 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 261 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 262 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 263 | ret = ec_poll(ec); |
f351d027 | 264 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 265 | ec->curr = NULL; |
f351d027 | 266 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
267 | return ret; |
268 | } | |
269 | ||
270 | static int ec_check_ibf0(struct acpi_ec *ec) | |
271 | { | |
272 | u8 status = acpi_ec_read_status(ec); | |
273 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
274 | } |
275 | ||
c0ff1772 AS |
276 | static int ec_wait_ibf0(struct acpi_ec *ec) |
277 | { | |
7a18e96d | 278 | unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); |
c0ff1772 | 279 | /* interrupt wait manually if GPE mode is not active */ |
c0ff1772 | 280 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
281 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
282 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
283 | return 0; |
284 | return -ETIME; | |
45bea155 LY |
285 | } |
286 | ||
2a84cb98 | 287 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 288 | { |
d7a76e4c | 289 | int status; |
50526df6 | 290 | u32 glk; |
8463200a | 291 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 292 | return -EINVAL; |
8463200a AS |
293 | if (t->rdata) |
294 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 295 | mutex_lock(&ec->mutex); |
fe955682 | 296 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
297 | status = -EINVAL; |
298 | goto unlock; | |
299 | } | |
703959d4 | 300 | if (ec->global_lock) { |
1da177e4 | 301 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 302 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
303 | status = -ENODEV; |
304 | goto unlock; | |
c24e912b | 305 | } |
1da177e4 | 306 | } |
c0ff1772 | 307 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
308 | pr_err(PREFIX "input buffer is not empty, " |
309 | "aborting transaction\n"); | |
7c6db4e0 | 310 | status = -ETIME; |
451566f4 | 311 | goto end; |
716e084e | 312 | } |
a62e8f19 AS |
313 | pr_debug(PREFIX "transaction start\n"); |
314 | /* disable GPE during transaction if storm is detected */ | |
315 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
316 | /* It has to be disabled, so that it doesn't trigger. */ |
317 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
318 | } |
319 | ||
2a84cb98 | 320 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
321 | |
322 | /* check if we received SCI during transaction */ | |
323 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
324 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 325 | msleep(1); |
3784730b RW |
326 | /* It is safe to enable the GPE outside of the transaction. */ |
327 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 328 | } else if (t->irq_count > ec_storm_threshold) { |
a62e8f19 AS |
329 | pr_info(PREFIX "GPE storm detected, " |
330 | "transactions will use polling mode\n"); | |
331 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
332 | } | |
54070101 | 333 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 334 | end: |
703959d4 | 335 | if (ec->global_lock) |
1da177e4 | 336 | acpi_release_global_lock(glk); |
7c6db4e0 | 337 | unlock: |
f351d027 | 338 | mutex_unlock(&ec->mutex); |
d550d98d | 339 | return status; |
1da177e4 LT |
340 | } |
341 | ||
8a383ef0 | 342 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
343 | { |
344 | u8 d; | |
8463200a AS |
345 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
346 | .wdata = NULL, .rdata = &d, | |
347 | .wlen = 0, .rlen = 1}; | |
348 | ||
2a84cb98 | 349 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
350 | } |
351 | ||
8a383ef0 | 352 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 353 | { |
8463200a AS |
354 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
355 | .wdata = NULL, .rdata = NULL, | |
356 | .wlen = 0, .rlen = 0}; | |
357 | ||
7c6db4e0 | 358 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 359 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
360 | } |
361 | ||
6ccedb10 | 362 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
363 | { |
364 | int result; | |
365 | u8 d; | |
8463200a AS |
366 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
367 | .wdata = &address, .rdata = &d, | |
368 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 369 | |
2a84cb98 | 370 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
371 | *data = d; |
372 | return result; | |
373 | } | |
6ffb221a | 374 | |
3576cf61 DS |
375 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
376 | { | |
6ccedb10 | 377 | u8 wdata[2] = { address, data }; |
8463200a AS |
378 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
379 | .wdata = wdata, .rdata = NULL, | |
380 | .wlen = 2, .rlen = 0}; | |
381 | ||
2a84cb98 | 382 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
383 | } |
384 | ||
1da177e4 LT |
385 | /* |
386 | * Externally callable EC access functions. For now, assume 1 EC only | |
387 | */ | |
c45aac43 AS |
388 | int ec_burst_enable(void) |
389 | { | |
c45aac43 AS |
390 | if (!first_ec) |
391 | return -ENODEV; | |
d033879c | 392 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
393 | } |
394 | ||
395 | EXPORT_SYMBOL(ec_burst_enable); | |
396 | ||
397 | int ec_burst_disable(void) | |
398 | { | |
c45aac43 AS |
399 | if (!first_ec) |
400 | return -ENODEV; | |
d033879c | 401 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
402 | } |
403 | ||
404 | EXPORT_SYMBOL(ec_burst_disable); | |
405 | ||
6ccedb10 | 406 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 407 | { |
1da177e4 | 408 | int err; |
6ffb221a | 409 | u8 temp_data; |
1da177e4 LT |
410 | |
411 | if (!first_ec) | |
412 | return -ENODEV; | |
413 | ||
d033879c | 414 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
415 | |
416 | if (!err) { | |
417 | *val = temp_data; | |
418 | return 0; | |
50526df6 | 419 | } else |
1da177e4 LT |
420 | return err; |
421 | } | |
50526df6 | 422 | |
1da177e4 LT |
423 | EXPORT_SYMBOL(ec_read); |
424 | ||
50526df6 | 425 | int ec_write(u8 addr, u8 val) |
1da177e4 | 426 | { |
1da177e4 LT |
427 | int err; |
428 | ||
429 | if (!first_ec) | |
430 | return -ENODEV; | |
431 | ||
d033879c | 432 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
433 | |
434 | return err; | |
435 | } | |
50526df6 | 436 | |
1da177e4 LT |
437 | EXPORT_SYMBOL(ec_write); |
438 | ||
616362de | 439 | int ec_transaction(u8 command, |
9e197219 | 440 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 441 | u8 * rdata, unsigned rdata_len) |
45bea155 | 442 | { |
8463200a AS |
443 | struct transaction t = {.command = command, |
444 | .wdata = wdata, .rdata = rdata, | |
445 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
446 | if (!first_ec) |
447 | return -ENODEV; | |
45bea155 | 448 | |
2a84cb98 | 449 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 450 | } |
1da177e4 | 451 | |
ab9e43c6 LP |
452 | EXPORT_SYMBOL(ec_transaction); |
453 | ||
3e2abc5a SF |
454 | /* Get the handle to the EC device */ |
455 | acpi_handle ec_get_handle(void) | |
456 | { | |
457 | if (!first_ec) | |
458 | return NULL; | |
459 | return first_ec->handle; | |
460 | } | |
461 | ||
462 | EXPORT_SYMBOL(ec_get_handle); | |
463 | ||
fe955682 | 464 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
465 | { |
466 | struct acpi_ec *ec = first_ec; | |
467 | ||
468 | if (!ec) | |
469 | return; | |
470 | ||
f351d027 | 471 | mutex_lock(&ec->mutex); |
f6bb13aa | 472 | /* Prevent transactions from being carried out */ |
fe955682 | 473 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 474 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
475 | } |
476 | ||
fe955682 | 477 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
478 | { |
479 | struct acpi_ec *ec = first_ec; | |
480 | ||
481 | if (!ec) | |
482 | return; | |
483 | ||
f351d027 | 484 | mutex_lock(&ec->mutex); |
f6bb13aa | 485 | /* Allow transactions to be carried out again */ |
fe955682 | 486 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 487 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
488 | } |
489 | ||
fe955682 | 490 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
491 | { |
492 | /* | |
493 | * Allow transactions to happen again (this function is called from | |
494 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
495 | */ | |
496 | if (first_ec) | |
fe955682 | 497 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
498 | } |
499 | ||
a62e8f19 | 500 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
501 | { |
502 | int result; | |
6ccedb10 | 503 | u8 d; |
8463200a AS |
504 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
505 | .wdata = NULL, .rdata = &d, | |
506 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
507 | if (!ec || !data) |
508 | return -EINVAL; | |
6ccedb10 AS |
509 | /* |
510 | * Query the EC to find out which _Qxx method we need to evaluate. | |
511 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
512 | * bit to be cleared (and thus clearing the interrupt source). | |
513 | */ | |
a62e8f19 | 514 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
515 | if (result) |
516 | return result; | |
6ccedb10 AS |
517 | if (!d) |
518 | return -ENODATA; | |
6ccedb10 AS |
519 | *data = d; |
520 | return 0; | |
1da177e4 LT |
521 | } |
522 | ||
1da177e4 LT |
523 | /* -------------------------------------------------------------------------- |
524 | Event Management | |
525 | -------------------------------------------------------------------------- */ | |
837012ed AS |
526 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
527 | acpi_handle handle, acpi_ec_query_func func, | |
528 | void *data) | |
529 | { | |
530 | struct acpi_ec_query_handler *handler = | |
531 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
532 | if (!handler) | |
533 | return -ENOMEM; | |
534 | ||
535 | handler->query_bit = query_bit; | |
536 | handler->handle = handle; | |
537 | handler->func = func; | |
538 | handler->data = data; | |
f351d027 | 539 | mutex_lock(&ec->mutex); |
30c08574 | 540 | list_add(&handler->node, &ec->list); |
f351d027 | 541 | mutex_unlock(&ec->mutex); |
837012ed AS |
542 | return 0; |
543 | } | |
544 | ||
545 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
546 | ||
547 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
548 | { | |
1544fdbc | 549 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 550 | mutex_lock(&ec->mutex); |
1544fdbc | 551 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
552 | if (query_bit == handler->query_bit) { |
553 | list_del(&handler->node); | |
554 | kfree(handler); | |
837012ed AS |
555 | } |
556 | } | |
f351d027 | 557 | mutex_unlock(&ec->mutex); |
837012ed AS |
558 | } |
559 | ||
560 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 561 | |
a62e8f19 | 562 | static void acpi_ec_run(void *cxt) |
45bea155 | 563 | { |
a62e8f19 AS |
564 | struct acpi_ec_query_handler *handler = cxt; |
565 | if (!handler) | |
e41334c0 | 566 | return; |
a62e8f19 AS |
567 | pr_debug(PREFIX "start query execution\n"); |
568 | if (handler->func) | |
569 | handler->func(handler->data); | |
570 | else if (handler->handle) | |
571 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
572 | pr_debug(PREFIX "stop query execution\n"); | |
573 | kfree(handler); | |
574 | } | |
575 | ||
576 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
577 | { | |
578 | u8 value = 0; | |
579 | int status; | |
580 | struct acpi_ec_query_handler *handler, *copy; | |
581 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
582 | return status; | |
837012ed AS |
583 | list_for_each_entry(handler, &ec->list, node) { |
584 | if (value == handler->query_bit) { | |
585 | /* have custom handler for this bit */ | |
a62e8f19 AS |
586 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
587 | if (!copy) | |
588 | return -ENOMEM; | |
589 | memcpy(copy, handler, sizeof(*copy)); | |
590 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
591 | return acpi_os_execute((copy->func) ? |
592 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 593 | acpi_ec_run, copy); |
837012ed AS |
594 | } |
595 | } | |
a62e8f19 AS |
596 | return 0; |
597 | } | |
598 | ||
599 | static void acpi_ec_gpe_query(void *ec_cxt) | |
600 | { | |
601 | struct acpi_ec *ec = ec_cxt; | |
602 | if (!ec) | |
603 | return; | |
f351d027 | 604 | mutex_lock(&ec->mutex); |
a62e8f19 | 605 | acpi_ec_sync_query(ec); |
f351d027 | 606 | mutex_unlock(&ec->mutex); |
45bea155 | 607 | } |
1da177e4 | 608 | |
a62e8f19 AS |
609 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
610 | { | |
611 | if (state & ACPI_EC_FLAG_SCI) { | |
612 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
613 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
614 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
615 | acpi_ec_gpe_query, ec); | |
616 | } | |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
8b6cd8ad LM |
621 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
622 | u32 gpe_number, void *data) | |
1da177e4 | 623 | { |
3d02b90b | 624 | struct acpi_ec *ec = data; |
00eb43a1 | 625 | |
3ebe08a7 | 626 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 627 | |
a62e8f19 AS |
628 | advance_transaction(ec, acpi_ec_read_status(ec)); |
629 | if (ec_transaction_done(ec) && | |
630 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 631 | wake_up(&ec->wait); |
a62e8f19 AS |
632 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
633 | } | |
bba63a29 | 634 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
635 | } |
636 | ||
1da177e4 LT |
637 | /* -------------------------------------------------------------------------- |
638 | Address Space Management | |
639 | -------------------------------------------------------------------------- */ | |
640 | ||
1da177e4 | 641 | static acpi_status |
5b7734b4 | 642 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 643 | u32 bits, u64 *value64, |
50526df6 | 644 | void *handler_context, void *region_context) |
1da177e4 | 645 | { |
3d02b90b | 646 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
647 | int result = 0, i, bytes = bits / 8; |
648 | u8 *value = (u8 *)value64; | |
1da177e4 | 649 | |
1da177e4 | 650 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 651 | return AE_BAD_PARAMETER; |
1da177e4 | 652 | |
5b7734b4 | 653 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 654 | return AE_BAD_PARAMETER; |
1da177e4 | 655 | |
dadf28a1 | 656 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 657 | acpi_ec_burst_enable(ec); |
b3b233c7 | 658 | |
dadf28a1 AS |
659 | for (i = 0; i < bytes; ++i, ++address, ++value) |
660 | result = (function == ACPI_READ) ? | |
661 | acpi_ec_read(ec, address, value) : | |
662 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 663 | |
dadf28a1 | 664 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 665 | acpi_ec_burst_disable(ec); |
b3b233c7 | 666 | |
1da177e4 LT |
667 | switch (result) { |
668 | case -EINVAL: | |
d550d98d | 669 | return AE_BAD_PARAMETER; |
1da177e4 LT |
670 | break; |
671 | case -ENODEV: | |
d550d98d | 672 | return AE_NOT_FOUND; |
1da177e4 LT |
673 | break; |
674 | case -ETIME: | |
d550d98d | 675 | return AE_TIME; |
1da177e4 LT |
676 | break; |
677 | default: | |
d550d98d | 678 | return AE_OK; |
1da177e4 | 679 | } |
1da177e4 LT |
680 | } |
681 | ||
1da177e4 LT |
682 | /* -------------------------------------------------------------------------- |
683 | Driver Interface | |
684 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
685 | static acpi_status |
686 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
687 | ||
c0900c35 AS |
688 | static struct acpi_ec *make_acpi_ec(void) |
689 | { | |
690 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
691 | if (!ec) | |
692 | return NULL; | |
080e412c | 693 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 694 | mutex_init(&ec->mutex); |
c0900c35 | 695 | init_waitqueue_head(&ec->wait); |
837012ed | 696 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 697 | spin_lock_init(&ec->lock); |
c0900c35 AS |
698 | return ec; |
699 | } | |
837012ed | 700 | |
c019b193 AS |
701 | static acpi_status |
702 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
703 | void *context, void **return_value) | |
704 | { | |
0175d562 LM |
705 | char node_name[5]; |
706 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
707 | struct acpi_ec *ec = context; |
708 | int value = 0; | |
0175d562 LM |
709 | acpi_status status; |
710 | ||
711 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
712 | ||
713 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
714 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
715 | } | |
716 | return AE_OK; | |
717 | } | |
718 | ||
cd8c93a4 AS |
719 | static acpi_status |
720 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 721 | { |
cd8c93a4 | 722 | acpi_status status; |
d21cf3c1 | 723 | unsigned long long tmp = 0; |
cd8c93a4 AS |
724 | |
725 | struct acpi_ec *ec = context; | |
a5032bfd AS |
726 | |
727 | /* clear addr values, ec_parse_io_ports depend on it */ | |
728 | ec->command_addr = ec->data_addr = 0; | |
729 | ||
cd8c93a4 AS |
730 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
731 | ec_parse_io_ports, ec); | |
732 | if (ACPI_FAILURE(status)) | |
733 | return status; | |
837012ed AS |
734 | |
735 | /* Get GPE bit assignment (EC events). */ | |
736 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 737 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
738 | if (ACPI_FAILURE(status)) |
739 | return status; | |
27663c58 | 740 | ec->gpe = tmp; |
837012ed | 741 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 742 | tmp = 0; |
27663c58 MW |
743 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
744 | ec->global_lock = tmp; | |
837012ed | 745 | ec->handle = handle; |
cd8c93a4 | 746 | return AE_CTRL_TERMINATE; |
837012ed AS |
747 | } |
748 | ||
5efc5476 BH |
749 | static int ec_install_handlers(struct acpi_ec *ec) |
750 | { | |
751 | acpi_status status; | |
752 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
753 | return 0; | |
754 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
755 | ACPI_GPE_EDGE_TRIGGERED, | |
756 | &acpi_ec_gpe_handler, ec); | |
757 | if (ACPI_FAILURE(status)) | |
758 | return -ENODEV; | |
9630bdd9 | 759 | |
a44061aa | 760 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
761 | status = acpi_install_address_space_handler(ec->handle, |
762 | ACPI_ADR_SPACE_EC, | |
763 | &acpi_ec_space_handler, | |
764 | NULL, ec); | |
765 | if (ACPI_FAILURE(status)) { | |
766 | if (status == AE_NOT_FOUND) { | |
767 | /* | |
768 | * Maybe OS fails in evaluating the _REG object. | |
769 | * The AE_NOT_FOUND error will be ignored and OS | |
770 | * continue to initialize EC. | |
771 | */ | |
772 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
773 | " of EC device. Broken bios is suspected.\n"); | |
774 | } else { | |
775 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
776 | &acpi_ec_gpe_handler); | |
a44061aa | 777 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
778 | return -ENODEV; |
779 | } | |
780 | } | |
781 | ||
782 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
783 | return 0; | |
784 | } | |
785 | ||
4c611060 AS |
786 | static void ec_remove_handlers(struct acpi_ec *ec) |
787 | { | |
a44061aa | 788 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
789 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
790 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 791 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
792 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
793 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 794 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 795 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
796 | } |
797 | ||
703959d4 | 798 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 799 | { |
703959d4 | 800 | struct acpi_ec *ec = NULL; |
d02be047 | 801 | int ret; |
45bea155 | 802 | |
c0900c35 AS |
803 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
804 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
805 | ||
4c611060 | 806 | /* Check for boot EC */ |
ce52ddf5 AS |
807 | if (boot_ec && |
808 | (boot_ec->handle == device->handle || | |
809 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
810 | ec = boot_ec; | |
811 | boot_ec = NULL; | |
812 | } else { | |
813 | ec = make_acpi_ec(); | |
814 | if (!ec) | |
815 | return -ENOMEM; | |
a5032bfd AS |
816 | } |
817 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
818 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
819 | kfree(ec); |
820 | return -EINVAL; | |
4c611060 AS |
821 | } |
822 | ||
ce52ddf5 AS |
823 | /* Find and register all query methods */ |
824 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 825 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 826 | |
4c611060 AS |
827 | if (!first_ec) |
828 | first_ec = ec; | |
db89b4f0 | 829 | device->driver_data = ec; |
de4f1046 | 830 | |
d6795fe3 AK |
831 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
832 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
833 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
834 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 835 | |
3ebe08a7 | 836 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 837 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
838 | |
839 | ret = ec_install_handlers(ec); | |
840 | ||
841 | /* EC is fully operational, allow queries */ | |
842 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
843 | return ret; | |
1da177e4 LT |
844 | } |
845 | ||
50526df6 | 846 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 847 | { |
01f22462 | 848 | struct acpi_ec *ec; |
07ddf768 | 849 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 850 | |
1da177e4 | 851 | if (!device) |
d550d98d | 852 | return -EINVAL; |
1da177e4 LT |
853 | |
854 | ec = acpi_driver_data(device); | |
cf745ec7 | 855 | ec_remove_handlers(ec); |
f351d027 | 856 | mutex_lock(&ec->mutex); |
07ddf768 | 857 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
858 | list_del(&handler->node); |
859 | kfree(handler); | |
860 | } | |
f351d027 | 861 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
862 | release_region(ec->data_addr, 1); |
863 | release_region(ec->command_addr, 1); | |
db89b4f0 | 864 | device->driver_data = NULL; |
d033879c | 865 | if (ec == first_ec) |
c0900c35 | 866 | first_ec = NULL; |
4c611060 | 867 | kfree(ec); |
d550d98d | 868 | return 0; |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 | 871 | static acpi_status |
c0900c35 | 872 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 873 | { |
3d02b90b | 874 | struct acpi_ec *ec = context; |
1da177e4 | 875 | |
01f22462 | 876 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 877 | return AE_OK; |
1da177e4 LT |
878 | |
879 | /* | |
880 | * The first address region returned is the data port, and | |
881 | * the second address region returned is the status/command | |
882 | * port. | |
883 | */ | |
de4f1046 | 884 | if (ec->data_addr == 0) |
6ffb221a | 885 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 886 | else if (ec->command_addr == 0) |
6ffb221a | 887 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 888 | else |
1da177e4 | 889 | return AE_CTRL_TERMINATE; |
1da177e4 | 890 | |
1da177e4 LT |
891 | return AE_OK; |
892 | } | |
893 | ||
c04209a7 AS |
894 | int __init acpi_boot_ec_enable(void) |
895 | { | |
7c6db4e0 | 896 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
897 | return 0; |
898 | if (!ec_install_handlers(boot_ec)) { | |
899 | first_ec = boot_ec; | |
900 | return 0; | |
901 | } | |
902 | return -EFAULT; | |
903 | } | |
904 | ||
223883b7 AS |
905 | static const struct acpi_device_id ec_device_ids[] = { |
906 | {"PNP0C09", 0}, | |
907 | {"", 0}, | |
908 | }; | |
909 | ||
478fa03b AS |
910 | /* Some BIOS do not survive early DSDT scan, skip it */ |
911 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
912 | { | |
913 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
914 | return 0; | |
915 | } | |
916 | ||
0adf3c74 AS |
917 | /* ASUStek often supplies us with broken ECDT, validate it */ |
918 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
919 | { | |
920 | EC_FLAGS_VALIDATE_ECDT = 1; | |
921 | return 0; | |
922 | } | |
923 | ||
924 | /* MSI EC needs special treatment, enable it */ | |
925 | static int ec_flag_msi(const struct dmi_system_id *id) | |
926 | { | |
55b313f2 | 927 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
928 | EC_FLAGS_MSI = 1; |
929 | EC_FLAGS_VALIDATE_ECDT = 1; | |
930 | return 0; | |
931 | } | |
932 | ||
67bfa9b6 FT |
933 | /* |
934 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
935 | * the GPE storm threshold back to 20 | |
936 | */ | |
937 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
938 | { | |
939 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
940 | ec_storm_threshold = 20; | |
941 | return 0; | |
942 | } | |
943 | ||
0adf3c74 | 944 | static struct dmi_system_id __initdata ec_dmi_table[] = { |
478fa03b AS |
945 | { |
946 | ec_skip_dsdt_scan, "Compal JFL92", { | |
947 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
948 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
949 | { |
950 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
951 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
952 | { | |
953 | ec_flag_msi, "MSI hardware", { | |
954 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
955 | { | |
956 | ec_flag_msi, "MSI hardware", { | |
957 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 958 | { |
a5dc4f89 AS |
959 | ec_flag_msi, "MSI hardware", { |
960 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
961 | { | |
534bc4e3 ZR |
962 | ec_flag_msi, "Quanta hardware", { |
963 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
964 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
965 | { | |
966 | ec_flag_msi, "Quanta hardware", { | |
967 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
968 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
969 | { | |
0adf3c74 AS |
970 | ec_validate_ecdt, "ASUS hardware", { |
971 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
972 | { |
973 | ec_validate_ecdt, "ASUS hardware", { | |
974 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
975 | { |
976 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
977 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
978 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
0adf3c74 AS |
979 | {}, |
980 | }; | |
981 | ||
c0900c35 AS |
982 | int __init acpi_ec_ecdt_probe(void) |
983 | { | |
c0900c35 | 984 | acpi_status status; |
c6cb0e87 | 985 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 986 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 987 | |
d66d969d AS |
988 | boot_ec = make_acpi_ec(); |
989 | if (!boot_ec) | |
c0900c35 AS |
990 | return -ENOMEM; |
991 | /* | |
992 | * Generate a boot ec context | |
993 | */ | |
0adf3c74 | 994 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
995 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
996 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 997 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 998 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
999 | boot_ec->command_addr = ecdt_ptr->control.address; |
1000 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1001 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1002 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1003 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1004 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1005 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1006 | goto install; |
d6bd535d | 1007 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1008 | if (!saved_ec) |
1009 | return -ENOMEM; | |
c5279dee | 1010 | /* fall through */ |
cd8c93a4 | 1011 | } |
0adf3c74 | 1012 | |
478fa03b AS |
1013 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1014 | return -ENODEV; | |
1015 | ||
c5279dee AS |
1016 | /* This workaround is needed only on some broken machines, |
1017 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1018 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1019 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1020 | boot_ec, NULL); | |
1021 | /* Check that acpi_get_devices actually find something */ | |
1022 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1023 | goto error; | |
c6cb0e87 AS |
1024 | if (saved_ec) { |
1025 | /* try to find good ECDT from ASUSTek */ | |
1026 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1027 | saved_ec->data_addr != boot_ec->data_addr || | |
1028 | saved_ec->gpe != boot_ec->gpe || | |
1029 | saved_ec->handle != boot_ec->handle) | |
1030 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1031 | "ECDT tables, which are very hard to workaround. " | |
1032 | "Trying to use DSDT EC info instead. Please send " | |
1033 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1034 | kfree(saved_ec); | |
1035 | saved_ec = NULL; | |
1036 | } else { | |
1037 | /* We really need to limit this workaround, the only ASUS, | |
1038 | * which needs it, has fake EC._INI method, so use it as flag. | |
1039 | * Keep boot_ec struct as it will be needed soon. | |
1040 | */ | |
1041 | acpi_handle dummy; | |
1042 | if (!dmi_name_in_vendors("ASUS") || | |
1043 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1044 | &dummy))) | |
1045 | return -ENODEV; | |
1046 | } | |
c5279dee AS |
1047 | install: |
1048 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1049 | first_ec = boot_ec; |
e8284321 | 1050 | return 0; |
d033879c | 1051 | } |
c5279dee | 1052 | error: |
d66d969d AS |
1053 | kfree(boot_ec); |
1054 | boot_ec = NULL; | |
1da177e4 LT |
1055 | return -ENODEV; |
1056 | } | |
1057 | ||
223883b7 AS |
1058 | static struct acpi_driver acpi_ec_driver = { |
1059 | .name = "ec", | |
1060 | .class = ACPI_EC_CLASS, | |
1061 | .ids = ec_device_ids, | |
1062 | .ops = { | |
1063 | .add = acpi_ec_add, | |
1064 | .remove = acpi_ec_remove, | |
223883b7 AS |
1065 | }, |
1066 | }; | |
1067 | ||
a5f820fe | 1068 | int __init acpi_ec_init(void) |
1da177e4 | 1069 | { |
50526df6 | 1070 | int result = 0; |
1da177e4 | 1071 | |
1da177e4 LT |
1072 | /* Now register the driver for the EC */ |
1073 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1074 | if (result < 0) |
d550d98d | 1075 | return -ENODEV; |
1da177e4 | 1076 | |
d550d98d | 1077 | return result; |
1da177e4 LT |
1078 | } |
1079 | ||
1da177e4 LT |
1080 | /* EC driver currently not unloadable */ |
1081 | #if 0 | |
50526df6 | 1082 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1083 | { |
1da177e4 LT |
1084 | |
1085 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1086 | return; |
1da177e4 | 1087 | } |
7843932a | 1088 | #endif /* 0 */ |