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; |
b76b51ba FT |
178 | struct transaction *t = ec->curr; |
179 | ||
f351d027 | 180 | spin_lock_irqsave(&ec->lock, flags); |
b76b51ba | 181 | if (!t) |
7c6db4e0 | 182 | goto unlock; |
b76b51ba | 183 | if (t->wlen > t->wi) { |
a2f93aea AS |
184 | if ((status & ACPI_EC_FLAG_IBF) == 0) |
185 | acpi_ec_write_data(ec, | |
b76b51ba | 186 | t->wdata[t->wi++]); |
a2f93aea | 187 | else |
dd15f8c4 | 188 | goto err; |
b76b51ba | 189 | } else if (t->rlen > t->ri) { |
7c6db4e0 | 190 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
b76b51ba FT |
191 | t->rdata[t->ri++] = acpi_ec_read_data(ec); |
192 | if (t->rlen == t->ri) | |
193 | t->done = true; | |
7c6db4e0 | 194 | } else |
dd15f8c4 | 195 | goto err; |
b76b51ba | 196 | } else if (t->wlen == t->wi && |
a2f93aea | 197 | (status & ACPI_EC_FLAG_IBF) == 0) |
b76b51ba | 198 | t->done = true; |
dd15f8c4 AS |
199 | goto unlock; |
200 | err: | |
201 | /* false interrupt, state didn't change */ | |
7b4d4692 | 202 | if (in_interrupt()) |
b76b51ba | 203 | ++t->irq_count; |
7c6db4e0 | 204 | unlock: |
f351d027 | 205 | spin_unlock_irqrestore(&ec->lock, flags); |
845625cd | 206 | } |
03d1d99c | 207 | |
a62e8f19 | 208 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 209 | |
a62e8f19 | 210 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 211 | { |
7c6db4e0 AS |
212 | if (state & ACPI_EC_FLAG_SCI) { |
213 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 214 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
215 | } |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int ec_poll(struct acpi_ec *ec) | |
220 | { | |
2a84cb98 AS |
221 | unsigned long flags; |
222 | int repeat = 2; /* number of command restarts */ | |
223 | while (repeat--) { | |
224 | unsigned long delay = jiffies + | |
7a18e96d | 225 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
226 | do { |
227 | /* don't sleep with disabled interrupts */ | |
228 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
229 | udelay(ACPI_EC_MSI_UDELAY); | |
230 | if (ec_transaction_done(ec)) | |
231 | return 0; | |
232 | } else { | |
233 | if (wait_event_timeout(ec->wait, | |
234 | ec_transaction_done(ec), | |
235 | msecs_to_jiffies(1))) | |
236 | return 0; | |
237 | } | |
238 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
239 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 240 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 241 | break; |
2a84cb98 | 242 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
f351d027 | 243 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 244 | start_transaction(ec); |
f351d027 | 245 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 246 | } |
b77d81b2 | 247 | return -ETIME; |
1da177e4 LT |
248 | } |
249 | ||
8463200a | 250 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 251 | struct transaction *t) |
45bea155 | 252 | { |
7c6db4e0 | 253 | unsigned long tmp; |
7c6db4e0 | 254 | int ret = 0; |
5423a0cb | 255 | if (EC_FLAGS_MSI) |
2a84cb98 | 256 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 257 | /* start transaction */ |
f351d027 | 258 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 259 | /* following two actions should be kept atomic */ |
8463200a | 260 | ec->curr = t; |
a2f93aea | 261 | start_transaction(ec); |
8463200a | 262 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 263 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 264 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 265 | ret = ec_poll(ec); |
f351d027 | 266 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 267 | ec->curr = NULL; |
f351d027 | 268 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
269 | return ret; |
270 | } | |
271 | ||
272 | static int ec_check_ibf0(struct acpi_ec *ec) | |
273 | { | |
274 | u8 status = acpi_ec_read_status(ec); | |
275 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
276 | } |
277 | ||
c0ff1772 AS |
278 | static int ec_wait_ibf0(struct acpi_ec *ec) |
279 | { | |
7a18e96d | 280 | unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); |
c0ff1772 | 281 | /* interrupt wait manually if GPE mode is not active */ |
c0ff1772 | 282 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
283 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
284 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
285 | return 0; |
286 | return -ETIME; | |
45bea155 LY |
287 | } |
288 | ||
2a84cb98 | 289 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 290 | { |
d7a76e4c | 291 | int status; |
50526df6 | 292 | u32 glk; |
8463200a | 293 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 294 | return -EINVAL; |
8463200a AS |
295 | if (t->rdata) |
296 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 297 | mutex_lock(&ec->mutex); |
fe955682 | 298 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
299 | status = -EINVAL; |
300 | goto unlock; | |
301 | } | |
703959d4 | 302 | if (ec->global_lock) { |
1da177e4 | 303 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 304 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
305 | status = -ENODEV; |
306 | goto unlock; | |
c24e912b | 307 | } |
1da177e4 | 308 | } |
c0ff1772 | 309 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
310 | pr_err(PREFIX "input buffer is not empty, " |
311 | "aborting transaction\n"); | |
7c6db4e0 | 312 | status = -ETIME; |
451566f4 | 313 | goto end; |
716e084e | 314 | } |
b76b51ba FT |
315 | pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n", |
316 | t->command, t->wdata ? t->wdata[0] : 0); | |
a62e8f19 AS |
317 | /* disable GPE during transaction if storm is detected */ |
318 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
319 | /* It has to be disabled, so that it doesn't trigger. */ |
320 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
321 | } |
322 | ||
2a84cb98 | 323 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
324 | |
325 | /* check if we received SCI during transaction */ | |
326 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
327 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 328 | msleep(1); |
3784730b RW |
329 | /* It is safe to enable the GPE outside of the transaction. */ |
330 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 331 | } else if (t->irq_count > ec_storm_threshold) { |
b76b51ba FT |
332 | pr_info(PREFIX "GPE storm detected(%d GPEs), " |
333 | "transactions will use polling mode\n", | |
334 | t->irq_count); | |
a62e8f19 AS |
335 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
336 | } | |
54070101 | 337 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 338 | end: |
703959d4 | 339 | if (ec->global_lock) |
1da177e4 | 340 | acpi_release_global_lock(glk); |
7c6db4e0 | 341 | unlock: |
f351d027 | 342 | mutex_unlock(&ec->mutex); |
d550d98d | 343 | return status; |
1da177e4 LT |
344 | } |
345 | ||
8a383ef0 | 346 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
347 | { |
348 | u8 d; | |
8463200a AS |
349 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
350 | .wdata = NULL, .rdata = &d, | |
351 | .wlen = 0, .rlen = 1}; | |
352 | ||
2a84cb98 | 353 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
354 | } |
355 | ||
8a383ef0 | 356 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 357 | { |
8463200a AS |
358 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
359 | .wdata = NULL, .rdata = NULL, | |
360 | .wlen = 0, .rlen = 0}; | |
361 | ||
7c6db4e0 | 362 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 363 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
364 | } |
365 | ||
6ccedb10 | 366 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
367 | { |
368 | int result; | |
369 | u8 d; | |
8463200a AS |
370 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
371 | .wdata = &address, .rdata = &d, | |
372 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 373 | |
2a84cb98 | 374 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
375 | *data = d; |
376 | return result; | |
377 | } | |
6ffb221a | 378 | |
3576cf61 DS |
379 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
380 | { | |
6ccedb10 | 381 | u8 wdata[2] = { address, data }; |
8463200a AS |
382 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
383 | .wdata = wdata, .rdata = NULL, | |
384 | .wlen = 2, .rlen = 0}; | |
385 | ||
2a84cb98 | 386 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
387 | } |
388 | ||
1da177e4 LT |
389 | /* |
390 | * Externally callable EC access functions. For now, assume 1 EC only | |
391 | */ | |
c45aac43 AS |
392 | int ec_burst_enable(void) |
393 | { | |
c45aac43 AS |
394 | if (!first_ec) |
395 | return -ENODEV; | |
d033879c | 396 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
397 | } |
398 | ||
399 | EXPORT_SYMBOL(ec_burst_enable); | |
400 | ||
401 | int ec_burst_disable(void) | |
402 | { | |
c45aac43 AS |
403 | if (!first_ec) |
404 | return -ENODEV; | |
d033879c | 405 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
406 | } |
407 | ||
408 | EXPORT_SYMBOL(ec_burst_disable); | |
409 | ||
b76b51ba | 410 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 411 | { |
1da177e4 | 412 | int err; |
6ffb221a | 413 | u8 temp_data; |
1da177e4 LT |
414 | |
415 | if (!first_ec) | |
416 | return -ENODEV; | |
417 | ||
d033879c | 418 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
419 | |
420 | if (!err) { | |
421 | *val = temp_data; | |
422 | return 0; | |
50526df6 | 423 | } else |
1da177e4 LT |
424 | return err; |
425 | } | |
50526df6 | 426 | |
1da177e4 LT |
427 | EXPORT_SYMBOL(ec_read); |
428 | ||
50526df6 | 429 | int ec_write(u8 addr, u8 val) |
1da177e4 | 430 | { |
1da177e4 LT |
431 | int err; |
432 | ||
433 | if (!first_ec) | |
434 | return -ENODEV; | |
435 | ||
d033879c | 436 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
437 | |
438 | return err; | |
439 | } | |
50526df6 | 440 | |
1da177e4 LT |
441 | EXPORT_SYMBOL(ec_write); |
442 | ||
616362de | 443 | int ec_transaction(u8 command, |
9e197219 | 444 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 445 | u8 * rdata, unsigned rdata_len) |
45bea155 | 446 | { |
8463200a AS |
447 | struct transaction t = {.command = command, |
448 | .wdata = wdata, .rdata = rdata, | |
449 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
450 | if (!first_ec) |
451 | return -ENODEV; | |
45bea155 | 452 | |
2a84cb98 | 453 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 454 | } |
1da177e4 | 455 | |
ab9e43c6 LP |
456 | EXPORT_SYMBOL(ec_transaction); |
457 | ||
3e2abc5a SF |
458 | /* Get the handle to the EC device */ |
459 | acpi_handle ec_get_handle(void) | |
460 | { | |
461 | if (!first_ec) | |
462 | return NULL; | |
463 | return first_ec->handle; | |
464 | } | |
465 | ||
466 | EXPORT_SYMBOL(ec_get_handle); | |
467 | ||
fe955682 | 468 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
469 | { |
470 | struct acpi_ec *ec = first_ec; | |
471 | ||
472 | if (!ec) | |
473 | return; | |
474 | ||
f351d027 | 475 | mutex_lock(&ec->mutex); |
f6bb13aa | 476 | /* Prevent transactions from being carried out */ |
fe955682 | 477 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 478 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
479 | } |
480 | ||
fe955682 | 481 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
482 | { |
483 | struct acpi_ec *ec = first_ec; | |
484 | ||
485 | if (!ec) | |
486 | return; | |
487 | ||
f351d027 | 488 | mutex_lock(&ec->mutex); |
f6bb13aa | 489 | /* Allow transactions to be carried out again */ |
fe955682 | 490 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 491 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
492 | } |
493 | ||
fe955682 | 494 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
495 | { |
496 | /* | |
497 | * Allow transactions to happen again (this function is called from | |
498 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
499 | */ | |
500 | if (first_ec) | |
fe955682 | 501 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
502 | } |
503 | ||
a62e8f19 | 504 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
505 | { |
506 | int result; | |
6ccedb10 | 507 | u8 d; |
8463200a AS |
508 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
509 | .wdata = NULL, .rdata = &d, | |
510 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
511 | if (!ec || !data) |
512 | return -EINVAL; | |
6ccedb10 AS |
513 | /* |
514 | * Query the EC to find out which _Qxx method we need to evaluate. | |
515 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
516 | * bit to be cleared (and thus clearing the interrupt source). | |
517 | */ | |
a62e8f19 | 518 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
519 | if (result) |
520 | return result; | |
6ccedb10 AS |
521 | if (!d) |
522 | return -ENODATA; | |
6ccedb10 AS |
523 | *data = d; |
524 | return 0; | |
1da177e4 LT |
525 | } |
526 | ||
1da177e4 LT |
527 | /* -------------------------------------------------------------------------- |
528 | Event Management | |
529 | -------------------------------------------------------------------------- */ | |
837012ed AS |
530 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
531 | acpi_handle handle, acpi_ec_query_func func, | |
532 | void *data) | |
533 | { | |
534 | struct acpi_ec_query_handler *handler = | |
535 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
536 | if (!handler) | |
537 | return -ENOMEM; | |
538 | ||
539 | handler->query_bit = query_bit; | |
540 | handler->handle = handle; | |
541 | handler->func = func; | |
542 | handler->data = data; | |
f351d027 | 543 | mutex_lock(&ec->mutex); |
30c08574 | 544 | list_add(&handler->node, &ec->list); |
f351d027 | 545 | mutex_unlock(&ec->mutex); |
837012ed AS |
546 | return 0; |
547 | } | |
548 | ||
549 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
550 | ||
551 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
552 | { | |
1544fdbc | 553 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 554 | mutex_lock(&ec->mutex); |
1544fdbc | 555 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
556 | if (query_bit == handler->query_bit) { |
557 | list_del(&handler->node); | |
558 | kfree(handler); | |
837012ed AS |
559 | } |
560 | } | |
f351d027 | 561 | mutex_unlock(&ec->mutex); |
837012ed AS |
562 | } |
563 | ||
564 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 565 | |
a62e8f19 | 566 | static void acpi_ec_run(void *cxt) |
45bea155 | 567 | { |
a62e8f19 AS |
568 | struct acpi_ec_query_handler *handler = cxt; |
569 | if (!handler) | |
e41334c0 | 570 | return; |
a62e8f19 AS |
571 | pr_debug(PREFIX "start query execution\n"); |
572 | if (handler->func) | |
573 | handler->func(handler->data); | |
574 | else if (handler->handle) | |
575 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
576 | pr_debug(PREFIX "stop query execution\n"); | |
577 | kfree(handler); | |
578 | } | |
579 | ||
580 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
581 | { | |
582 | u8 value = 0; | |
583 | int status; | |
584 | struct acpi_ec_query_handler *handler, *copy; | |
585 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
586 | return status; | |
837012ed AS |
587 | list_for_each_entry(handler, &ec->list, node) { |
588 | if (value == handler->query_bit) { | |
589 | /* have custom handler for this bit */ | |
a62e8f19 AS |
590 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
591 | if (!copy) | |
592 | return -ENOMEM; | |
593 | memcpy(copy, handler, sizeof(*copy)); | |
594 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
595 | return acpi_os_execute((copy->func) ? |
596 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 597 | acpi_ec_run, copy); |
837012ed AS |
598 | } |
599 | } | |
a62e8f19 AS |
600 | return 0; |
601 | } | |
602 | ||
603 | static void acpi_ec_gpe_query(void *ec_cxt) | |
604 | { | |
605 | struct acpi_ec *ec = ec_cxt; | |
606 | if (!ec) | |
607 | return; | |
f351d027 | 608 | mutex_lock(&ec->mutex); |
a62e8f19 | 609 | acpi_ec_sync_query(ec); |
f351d027 | 610 | mutex_unlock(&ec->mutex); |
45bea155 | 611 | } |
1da177e4 | 612 | |
a62e8f19 AS |
613 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
614 | { | |
615 | if (state & ACPI_EC_FLAG_SCI) { | |
616 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
617 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
618 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
619 | acpi_ec_gpe_query, ec); | |
620 | } | |
621 | } | |
622 | return 0; | |
623 | } | |
624 | ||
8b6cd8ad LM |
625 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
626 | u32 gpe_number, void *data) | |
1da177e4 | 627 | { |
3d02b90b | 628 | struct acpi_ec *ec = data; |
b76b51ba | 629 | u8 status = acpi_ec_read_status(ec); |
00eb43a1 | 630 | |
b76b51ba | 631 | pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status); |
7c6db4e0 | 632 | |
b76b51ba | 633 | advance_transaction(ec, status); |
a62e8f19 AS |
634 | if (ec_transaction_done(ec) && |
635 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 636 | wake_up(&ec->wait); |
a62e8f19 AS |
637 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
638 | } | |
bba63a29 | 639 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
640 | } |
641 | ||
1da177e4 LT |
642 | /* -------------------------------------------------------------------------- |
643 | Address Space Management | |
644 | -------------------------------------------------------------------------- */ | |
645 | ||
1da177e4 | 646 | static acpi_status |
5b7734b4 | 647 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 648 | u32 bits, u64 *value64, |
50526df6 | 649 | void *handler_context, void *region_context) |
1da177e4 | 650 | { |
3d02b90b | 651 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
652 | int result = 0, i, bytes = bits / 8; |
653 | u8 *value = (u8 *)value64; | |
1da177e4 | 654 | |
1da177e4 | 655 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 656 | return AE_BAD_PARAMETER; |
1da177e4 | 657 | |
5b7734b4 | 658 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 659 | return AE_BAD_PARAMETER; |
1da177e4 | 660 | |
dadf28a1 | 661 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 662 | acpi_ec_burst_enable(ec); |
b3b233c7 | 663 | |
dadf28a1 AS |
664 | for (i = 0; i < bytes; ++i, ++address, ++value) |
665 | result = (function == ACPI_READ) ? | |
666 | acpi_ec_read(ec, address, value) : | |
667 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 668 | |
dadf28a1 | 669 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 670 | acpi_ec_burst_disable(ec); |
b3b233c7 | 671 | |
1da177e4 LT |
672 | switch (result) { |
673 | case -EINVAL: | |
d550d98d | 674 | return AE_BAD_PARAMETER; |
1da177e4 LT |
675 | break; |
676 | case -ENODEV: | |
d550d98d | 677 | return AE_NOT_FOUND; |
1da177e4 LT |
678 | break; |
679 | case -ETIME: | |
d550d98d | 680 | return AE_TIME; |
1da177e4 LT |
681 | break; |
682 | default: | |
d550d98d | 683 | return AE_OK; |
1da177e4 | 684 | } |
1da177e4 LT |
685 | } |
686 | ||
1da177e4 LT |
687 | /* -------------------------------------------------------------------------- |
688 | Driver Interface | |
689 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
690 | static acpi_status |
691 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
692 | ||
c0900c35 AS |
693 | static struct acpi_ec *make_acpi_ec(void) |
694 | { | |
695 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
696 | if (!ec) | |
697 | return NULL; | |
080e412c | 698 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 699 | mutex_init(&ec->mutex); |
c0900c35 | 700 | init_waitqueue_head(&ec->wait); |
837012ed | 701 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 702 | spin_lock_init(&ec->lock); |
c0900c35 AS |
703 | return ec; |
704 | } | |
837012ed | 705 | |
c019b193 AS |
706 | static acpi_status |
707 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
708 | void *context, void **return_value) | |
709 | { | |
0175d562 LM |
710 | char node_name[5]; |
711 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
712 | struct acpi_ec *ec = context; |
713 | int value = 0; | |
0175d562 LM |
714 | acpi_status status; |
715 | ||
716 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
717 | ||
718 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
719 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
720 | } | |
721 | return AE_OK; | |
722 | } | |
723 | ||
cd8c93a4 AS |
724 | static acpi_status |
725 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 726 | { |
cd8c93a4 | 727 | acpi_status status; |
d21cf3c1 | 728 | unsigned long long tmp = 0; |
cd8c93a4 AS |
729 | |
730 | struct acpi_ec *ec = context; | |
a5032bfd AS |
731 | |
732 | /* clear addr values, ec_parse_io_ports depend on it */ | |
733 | ec->command_addr = ec->data_addr = 0; | |
734 | ||
cd8c93a4 AS |
735 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
736 | ec_parse_io_ports, ec); | |
737 | if (ACPI_FAILURE(status)) | |
738 | return status; | |
837012ed AS |
739 | |
740 | /* Get GPE bit assignment (EC events). */ | |
741 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 742 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
743 | if (ACPI_FAILURE(status)) |
744 | return status; | |
27663c58 | 745 | ec->gpe = tmp; |
837012ed | 746 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 747 | tmp = 0; |
27663c58 MW |
748 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
749 | ec->global_lock = tmp; | |
837012ed | 750 | ec->handle = handle; |
cd8c93a4 | 751 | return AE_CTRL_TERMINATE; |
837012ed AS |
752 | } |
753 | ||
5efc5476 BH |
754 | static int ec_install_handlers(struct acpi_ec *ec) |
755 | { | |
756 | acpi_status status; | |
757 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
758 | return 0; | |
759 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
760 | ACPI_GPE_EDGE_TRIGGERED, | |
761 | &acpi_ec_gpe_handler, ec); | |
762 | if (ACPI_FAILURE(status)) | |
763 | return -ENODEV; | |
9630bdd9 | 764 | |
a44061aa | 765 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
766 | status = acpi_install_address_space_handler(ec->handle, |
767 | ACPI_ADR_SPACE_EC, | |
768 | &acpi_ec_space_handler, | |
769 | NULL, ec); | |
770 | if (ACPI_FAILURE(status)) { | |
771 | if (status == AE_NOT_FOUND) { | |
772 | /* | |
773 | * Maybe OS fails in evaluating the _REG object. | |
774 | * The AE_NOT_FOUND error will be ignored and OS | |
775 | * continue to initialize EC. | |
776 | */ | |
777 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
778 | " of EC device. Broken bios is suspected.\n"); | |
779 | } else { | |
780 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
781 | &acpi_ec_gpe_handler); | |
a44061aa | 782 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
783 | return -ENODEV; |
784 | } | |
785 | } | |
786 | ||
787 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
788 | return 0; | |
789 | } | |
790 | ||
4c611060 AS |
791 | static void ec_remove_handlers(struct acpi_ec *ec) |
792 | { | |
a44061aa | 793 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
794 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
795 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 796 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
797 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
798 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 799 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 800 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
801 | } |
802 | ||
703959d4 | 803 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 804 | { |
703959d4 | 805 | struct acpi_ec *ec = NULL; |
d02be047 | 806 | int ret; |
45bea155 | 807 | |
c0900c35 AS |
808 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
809 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
810 | ||
4c611060 | 811 | /* Check for boot EC */ |
ce52ddf5 AS |
812 | if (boot_ec && |
813 | (boot_ec->handle == device->handle || | |
814 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
815 | ec = boot_ec; | |
816 | boot_ec = NULL; | |
817 | } else { | |
818 | ec = make_acpi_ec(); | |
819 | if (!ec) | |
820 | return -ENOMEM; | |
a5032bfd AS |
821 | } |
822 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
823 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
824 | kfree(ec); |
825 | return -EINVAL; | |
4c611060 AS |
826 | } |
827 | ||
ce52ddf5 AS |
828 | /* Find and register all query methods */ |
829 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 830 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 831 | |
4c611060 AS |
832 | if (!first_ec) |
833 | first_ec = ec; | |
db89b4f0 | 834 | device->driver_data = ec; |
de4f1046 | 835 | |
d6795fe3 AK |
836 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
837 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
838 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
839 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 840 | |
3ebe08a7 | 841 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 842 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
843 | |
844 | ret = ec_install_handlers(ec); | |
845 | ||
846 | /* EC is fully operational, allow queries */ | |
847 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
848 | return ret; | |
1da177e4 LT |
849 | } |
850 | ||
50526df6 | 851 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 852 | { |
01f22462 | 853 | struct acpi_ec *ec; |
07ddf768 | 854 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 855 | |
1da177e4 | 856 | if (!device) |
d550d98d | 857 | return -EINVAL; |
1da177e4 LT |
858 | |
859 | ec = acpi_driver_data(device); | |
cf745ec7 | 860 | ec_remove_handlers(ec); |
f351d027 | 861 | mutex_lock(&ec->mutex); |
07ddf768 | 862 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
863 | list_del(&handler->node); |
864 | kfree(handler); | |
865 | } | |
f351d027 | 866 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
867 | release_region(ec->data_addr, 1); |
868 | release_region(ec->command_addr, 1); | |
db89b4f0 | 869 | device->driver_data = NULL; |
d033879c | 870 | if (ec == first_ec) |
c0900c35 | 871 | first_ec = NULL; |
4c611060 | 872 | kfree(ec); |
d550d98d | 873 | return 0; |
1da177e4 LT |
874 | } |
875 | ||
1da177e4 | 876 | static acpi_status |
c0900c35 | 877 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 878 | { |
3d02b90b | 879 | struct acpi_ec *ec = context; |
1da177e4 | 880 | |
01f22462 | 881 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 882 | return AE_OK; |
1da177e4 LT |
883 | |
884 | /* | |
885 | * The first address region returned is the data port, and | |
886 | * the second address region returned is the status/command | |
887 | * port. | |
888 | */ | |
de4f1046 | 889 | if (ec->data_addr == 0) |
6ffb221a | 890 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 891 | else if (ec->command_addr == 0) |
6ffb221a | 892 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 893 | else |
1da177e4 | 894 | return AE_CTRL_TERMINATE; |
1da177e4 | 895 | |
1da177e4 LT |
896 | return AE_OK; |
897 | } | |
898 | ||
c04209a7 AS |
899 | int __init acpi_boot_ec_enable(void) |
900 | { | |
7c6db4e0 | 901 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
902 | return 0; |
903 | if (!ec_install_handlers(boot_ec)) { | |
904 | first_ec = boot_ec; | |
905 | return 0; | |
906 | } | |
907 | return -EFAULT; | |
908 | } | |
909 | ||
223883b7 AS |
910 | static const struct acpi_device_id ec_device_ids[] = { |
911 | {"PNP0C09", 0}, | |
912 | {"", 0}, | |
913 | }; | |
914 | ||
478fa03b AS |
915 | /* Some BIOS do not survive early DSDT scan, skip it */ |
916 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
917 | { | |
918 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
919 | return 0; | |
920 | } | |
921 | ||
0adf3c74 AS |
922 | /* ASUStek often supplies us with broken ECDT, validate it */ |
923 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
924 | { | |
925 | EC_FLAGS_VALIDATE_ECDT = 1; | |
926 | return 0; | |
927 | } | |
928 | ||
929 | /* MSI EC needs special treatment, enable it */ | |
930 | static int ec_flag_msi(const struct dmi_system_id *id) | |
931 | { | |
55b313f2 | 932 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
933 | EC_FLAGS_MSI = 1; |
934 | EC_FLAGS_VALIDATE_ECDT = 1; | |
935 | return 0; | |
936 | } | |
937 | ||
67bfa9b6 FT |
938 | /* |
939 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
940 | * the GPE storm threshold back to 20 | |
941 | */ | |
942 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
943 | { | |
944 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
945 | ec_storm_threshold = 20; | |
946 | return 0; | |
947 | } | |
948 | ||
0adf3c74 | 949 | static struct dmi_system_id __initdata ec_dmi_table[] = { |
478fa03b AS |
950 | { |
951 | ec_skip_dsdt_scan, "Compal JFL92", { | |
952 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
953 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
954 | { |
955 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
956 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
957 | { | |
958 | ec_flag_msi, "MSI hardware", { | |
959 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
960 | { | |
961 | ec_flag_msi, "MSI hardware", { | |
962 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 963 | { |
a5dc4f89 AS |
964 | ec_flag_msi, "MSI hardware", { |
965 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
966 | { | |
534bc4e3 ZR |
967 | ec_flag_msi, "Quanta hardware", { |
968 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
969 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
970 | { | |
971 | ec_flag_msi, "Quanta hardware", { | |
972 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
973 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
974 | { | |
0adf3c74 AS |
975 | ec_validate_ecdt, "ASUS hardware", { |
976 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
977 | { |
978 | ec_validate_ecdt, "ASUS hardware", { | |
979 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
980 | { |
981 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
982 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
983 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
0adf3c74 AS |
984 | {}, |
985 | }; | |
986 | ||
c0900c35 AS |
987 | int __init acpi_ec_ecdt_probe(void) |
988 | { | |
c0900c35 | 989 | acpi_status status; |
c6cb0e87 | 990 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 991 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 992 | |
d66d969d AS |
993 | boot_ec = make_acpi_ec(); |
994 | if (!boot_ec) | |
c0900c35 AS |
995 | return -ENOMEM; |
996 | /* | |
997 | * Generate a boot ec context | |
998 | */ | |
0adf3c74 | 999 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1000 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1001 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1002 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 1003 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1004 | boot_ec->command_addr = ecdt_ptr->control.address; |
1005 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1006 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1007 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1008 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1009 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1010 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1011 | goto install; |
d6bd535d | 1012 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1013 | if (!saved_ec) |
1014 | return -ENOMEM; | |
c5279dee | 1015 | /* fall through */ |
cd8c93a4 | 1016 | } |
0adf3c74 | 1017 | |
478fa03b AS |
1018 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1019 | return -ENODEV; | |
1020 | ||
c5279dee AS |
1021 | /* This workaround is needed only on some broken machines, |
1022 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1023 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1024 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1025 | boot_ec, NULL); | |
1026 | /* Check that acpi_get_devices actually find something */ | |
1027 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1028 | goto error; | |
c6cb0e87 AS |
1029 | if (saved_ec) { |
1030 | /* try to find good ECDT from ASUSTek */ | |
1031 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1032 | saved_ec->data_addr != boot_ec->data_addr || | |
1033 | saved_ec->gpe != boot_ec->gpe || | |
1034 | saved_ec->handle != boot_ec->handle) | |
1035 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1036 | "ECDT tables, which are very hard to workaround. " | |
1037 | "Trying to use DSDT EC info instead. Please send " | |
1038 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1039 | kfree(saved_ec); | |
1040 | saved_ec = NULL; | |
1041 | } else { | |
1042 | /* We really need to limit this workaround, the only ASUS, | |
1043 | * which needs it, has fake EC._INI method, so use it as flag. | |
1044 | * Keep boot_ec struct as it will be needed soon. | |
1045 | */ | |
1046 | acpi_handle dummy; | |
1047 | if (!dmi_name_in_vendors("ASUS") || | |
1048 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1049 | &dummy))) | |
1050 | return -ENODEV; | |
1051 | } | |
c5279dee AS |
1052 | install: |
1053 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1054 | first_ec = boot_ec; |
e8284321 | 1055 | return 0; |
d033879c | 1056 | } |
c5279dee | 1057 | error: |
d66d969d AS |
1058 | kfree(boot_ec); |
1059 | boot_ec = NULL; | |
1da177e4 LT |
1060 | return -ENODEV; |
1061 | } | |
1062 | ||
223883b7 AS |
1063 | static struct acpi_driver acpi_ec_driver = { |
1064 | .name = "ec", | |
1065 | .class = ACPI_EC_CLASS, | |
1066 | .ids = ec_device_ids, | |
1067 | .ops = { | |
1068 | .add = acpi_ec_add, | |
1069 | .remove = acpi_ec_remove, | |
223883b7 AS |
1070 | }, |
1071 | }; | |
1072 | ||
a5f820fe | 1073 | int __init acpi_ec_init(void) |
1da177e4 | 1074 | { |
50526df6 | 1075 | int result = 0; |
1da177e4 | 1076 | |
1da177e4 LT |
1077 | /* Now register the driver for the EC */ |
1078 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1079 | if (result < 0) |
d550d98d | 1080 | return -ENODEV; |
1da177e4 | 1081 | |
d550d98d | 1082 | return result; |
1da177e4 LT |
1083 | } |
1084 | ||
1da177e4 LT |
1085 | /* EC driver currently not unloadable */ |
1086 | #if 0 | |
50526df6 | 1087 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1088 | { |
1da177e4 LT |
1089 | |
1090 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1091 | return; |
1da177e4 | 1092 | } |
7843932a | 1093 | #endif /* 0 */ |