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: | |
a3cd8d27 FT |
201 | /* |
202 | * If SCI bit is set, then don't think it's a false IRQ | |
203 | * otherwise will take a not handled IRQ as a false one. | |
204 | */ | |
205 | if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI)) | |
b76b51ba | 206 | ++t->irq_count; |
a3cd8d27 | 207 | |
7c6db4e0 | 208 | unlock: |
f351d027 | 209 | spin_unlock_irqrestore(&ec->lock, flags); |
845625cd | 210 | } |
03d1d99c | 211 | |
a62e8f19 | 212 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 213 | |
a62e8f19 | 214 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 215 | { |
7c6db4e0 AS |
216 | if (state & ACPI_EC_FLAG_SCI) { |
217 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 218 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
219 | } |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int ec_poll(struct acpi_ec *ec) | |
224 | { | |
2a84cb98 | 225 | unsigned long flags; |
28fe5c82 | 226 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
227 | while (repeat--) { |
228 | unsigned long delay = jiffies + | |
7a18e96d | 229 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
230 | do { |
231 | /* don't sleep with disabled interrupts */ | |
232 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
233 | udelay(ACPI_EC_MSI_UDELAY); | |
234 | if (ec_transaction_done(ec)) | |
235 | return 0; | |
236 | } else { | |
237 | if (wait_event_timeout(ec->wait, | |
238 | ec_transaction_done(ec), | |
239 | msecs_to_jiffies(1))) | |
240 | return 0; | |
241 | } | |
242 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
243 | } while (time_before(jiffies, delay)); | |
2a84cb98 | 244 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
f351d027 | 245 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 246 | start_transaction(ec); |
f351d027 | 247 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 248 | } |
b77d81b2 | 249 | return -ETIME; |
1da177e4 LT |
250 | } |
251 | ||
8463200a | 252 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 253 | struct transaction *t) |
45bea155 | 254 | { |
7c6db4e0 | 255 | unsigned long tmp; |
7c6db4e0 | 256 | int ret = 0; |
5423a0cb | 257 | if (EC_FLAGS_MSI) |
2a84cb98 | 258 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 259 | /* start transaction */ |
f351d027 | 260 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 261 | /* following two actions should be kept atomic */ |
8463200a | 262 | ec->curr = t; |
a2f93aea | 263 | start_transaction(ec); |
8463200a | 264 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 265 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 266 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 267 | ret = ec_poll(ec); |
f351d027 | 268 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 269 | ec->curr = NULL; |
f351d027 | 270 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
271 | return ret; |
272 | } | |
273 | ||
274 | static int ec_check_ibf0(struct acpi_ec *ec) | |
275 | { | |
276 | u8 status = acpi_ec_read_status(ec); | |
277 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
278 | } |
279 | ||
c0ff1772 AS |
280 | static int ec_wait_ibf0(struct acpi_ec *ec) |
281 | { | |
7a18e96d | 282 | unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); |
c0ff1772 | 283 | /* interrupt wait manually if GPE mode is not active */ |
c0ff1772 | 284 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
285 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
286 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
287 | return 0; |
288 | return -ETIME; | |
45bea155 LY |
289 | } |
290 | ||
2a84cb98 | 291 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 292 | { |
d7a76e4c | 293 | int status; |
50526df6 | 294 | u32 glk; |
8463200a | 295 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 296 | return -EINVAL; |
8463200a AS |
297 | if (t->rdata) |
298 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 299 | mutex_lock(&ec->mutex); |
fe955682 | 300 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
301 | status = -EINVAL; |
302 | goto unlock; | |
303 | } | |
703959d4 | 304 | if (ec->global_lock) { |
1da177e4 | 305 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 306 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
307 | status = -ENODEV; |
308 | goto unlock; | |
c24e912b | 309 | } |
1da177e4 | 310 | } |
c0ff1772 | 311 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
312 | pr_err(PREFIX "input buffer is not empty, " |
313 | "aborting transaction\n"); | |
7c6db4e0 | 314 | status = -ETIME; |
451566f4 | 315 | goto end; |
716e084e | 316 | } |
b76b51ba FT |
317 | pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n", |
318 | t->command, t->wdata ? t->wdata[0] : 0); | |
a62e8f19 AS |
319 | /* disable GPE during transaction if storm is detected */ |
320 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
321 | /* It has to be disabled, so that it doesn't trigger. */ |
322 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
323 | } |
324 | ||
2a84cb98 | 325 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
326 | |
327 | /* check if we received SCI during transaction */ | |
328 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
329 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 330 | msleep(1); |
3784730b RW |
331 | /* It is safe to enable the GPE outside of the transaction. */ |
332 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 333 | } else if (t->irq_count > ec_storm_threshold) { |
b76b51ba FT |
334 | pr_info(PREFIX "GPE storm detected(%d GPEs), " |
335 | "transactions will use polling mode\n", | |
336 | t->irq_count); | |
a62e8f19 AS |
337 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
338 | } | |
54070101 | 339 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 340 | end: |
703959d4 | 341 | if (ec->global_lock) |
1da177e4 | 342 | acpi_release_global_lock(glk); |
7c6db4e0 | 343 | unlock: |
f351d027 | 344 | mutex_unlock(&ec->mutex); |
d550d98d | 345 | return status; |
1da177e4 LT |
346 | } |
347 | ||
8a383ef0 | 348 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
349 | { |
350 | u8 d; | |
8463200a AS |
351 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
352 | .wdata = NULL, .rdata = &d, | |
353 | .wlen = 0, .rlen = 1}; | |
354 | ||
2a84cb98 | 355 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
356 | } |
357 | ||
8a383ef0 | 358 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 359 | { |
8463200a AS |
360 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
361 | .wdata = NULL, .rdata = NULL, | |
362 | .wlen = 0, .rlen = 0}; | |
363 | ||
7c6db4e0 | 364 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 365 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
366 | } |
367 | ||
6ccedb10 | 368 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
369 | { |
370 | int result; | |
371 | u8 d; | |
8463200a AS |
372 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
373 | .wdata = &address, .rdata = &d, | |
374 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 375 | |
2a84cb98 | 376 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
377 | *data = d; |
378 | return result; | |
379 | } | |
6ffb221a | 380 | |
3576cf61 DS |
381 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
382 | { | |
6ccedb10 | 383 | u8 wdata[2] = { address, data }; |
8463200a AS |
384 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
385 | .wdata = wdata, .rdata = NULL, | |
386 | .wlen = 2, .rlen = 0}; | |
387 | ||
2a84cb98 | 388 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
389 | } |
390 | ||
1da177e4 LT |
391 | /* |
392 | * Externally callable EC access functions. For now, assume 1 EC only | |
393 | */ | |
c45aac43 AS |
394 | int ec_burst_enable(void) |
395 | { | |
c45aac43 AS |
396 | if (!first_ec) |
397 | return -ENODEV; | |
d033879c | 398 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
399 | } |
400 | ||
401 | EXPORT_SYMBOL(ec_burst_enable); | |
402 | ||
403 | int ec_burst_disable(void) | |
404 | { | |
c45aac43 AS |
405 | if (!first_ec) |
406 | return -ENODEV; | |
d033879c | 407 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
408 | } |
409 | ||
410 | EXPORT_SYMBOL(ec_burst_disable); | |
411 | ||
b76b51ba | 412 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 413 | { |
1da177e4 | 414 | int err; |
6ffb221a | 415 | u8 temp_data; |
1da177e4 LT |
416 | |
417 | if (!first_ec) | |
418 | return -ENODEV; | |
419 | ||
d033879c | 420 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
421 | |
422 | if (!err) { | |
423 | *val = temp_data; | |
424 | return 0; | |
50526df6 | 425 | } else |
1da177e4 LT |
426 | return err; |
427 | } | |
50526df6 | 428 | |
1da177e4 LT |
429 | EXPORT_SYMBOL(ec_read); |
430 | ||
50526df6 | 431 | int ec_write(u8 addr, u8 val) |
1da177e4 | 432 | { |
1da177e4 LT |
433 | int err; |
434 | ||
435 | if (!first_ec) | |
436 | return -ENODEV; | |
437 | ||
d033879c | 438 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
439 | |
440 | return err; | |
441 | } | |
50526df6 | 442 | |
1da177e4 LT |
443 | EXPORT_SYMBOL(ec_write); |
444 | ||
616362de | 445 | int ec_transaction(u8 command, |
9e197219 | 446 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 447 | u8 * rdata, unsigned rdata_len) |
45bea155 | 448 | { |
8463200a AS |
449 | struct transaction t = {.command = command, |
450 | .wdata = wdata, .rdata = rdata, | |
451 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
452 | if (!first_ec) |
453 | return -ENODEV; | |
45bea155 | 454 | |
2a84cb98 | 455 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 456 | } |
1da177e4 | 457 | |
ab9e43c6 LP |
458 | EXPORT_SYMBOL(ec_transaction); |
459 | ||
3e2abc5a SF |
460 | /* Get the handle to the EC device */ |
461 | acpi_handle ec_get_handle(void) | |
462 | { | |
463 | if (!first_ec) | |
464 | return NULL; | |
465 | return first_ec->handle; | |
466 | } | |
467 | ||
468 | EXPORT_SYMBOL(ec_get_handle); | |
469 | ||
fe955682 | 470 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
471 | { |
472 | struct acpi_ec *ec = first_ec; | |
473 | ||
474 | if (!ec) | |
475 | return; | |
476 | ||
f351d027 | 477 | mutex_lock(&ec->mutex); |
f6bb13aa | 478 | /* Prevent transactions from being carried out */ |
fe955682 | 479 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 480 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
481 | } |
482 | ||
fe955682 | 483 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
484 | { |
485 | struct acpi_ec *ec = first_ec; | |
486 | ||
487 | if (!ec) | |
488 | return; | |
489 | ||
f351d027 | 490 | mutex_lock(&ec->mutex); |
f6bb13aa | 491 | /* Allow transactions to be carried out again */ |
fe955682 | 492 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 493 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
494 | } |
495 | ||
fe955682 | 496 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
497 | { |
498 | /* | |
499 | * Allow transactions to happen again (this function is called from | |
500 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
501 | */ | |
502 | if (first_ec) | |
fe955682 | 503 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
504 | } |
505 | ||
a62e8f19 | 506 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
507 | { |
508 | int result; | |
6ccedb10 | 509 | u8 d; |
8463200a AS |
510 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
511 | .wdata = NULL, .rdata = &d, | |
512 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
513 | if (!ec || !data) |
514 | return -EINVAL; | |
6ccedb10 AS |
515 | /* |
516 | * Query the EC to find out which _Qxx method we need to evaluate. | |
517 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
518 | * bit to be cleared (and thus clearing the interrupt source). | |
519 | */ | |
a62e8f19 | 520 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
521 | if (result) |
522 | return result; | |
6ccedb10 AS |
523 | if (!d) |
524 | return -ENODATA; | |
6ccedb10 AS |
525 | *data = d; |
526 | return 0; | |
1da177e4 LT |
527 | } |
528 | ||
1da177e4 LT |
529 | /* -------------------------------------------------------------------------- |
530 | Event Management | |
531 | -------------------------------------------------------------------------- */ | |
837012ed AS |
532 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
533 | acpi_handle handle, acpi_ec_query_func func, | |
534 | void *data) | |
535 | { | |
536 | struct acpi_ec_query_handler *handler = | |
537 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
538 | if (!handler) | |
539 | return -ENOMEM; | |
540 | ||
541 | handler->query_bit = query_bit; | |
542 | handler->handle = handle; | |
543 | handler->func = func; | |
544 | handler->data = data; | |
f351d027 | 545 | mutex_lock(&ec->mutex); |
30c08574 | 546 | list_add(&handler->node, &ec->list); |
f351d027 | 547 | mutex_unlock(&ec->mutex); |
837012ed AS |
548 | return 0; |
549 | } | |
550 | ||
551 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
552 | ||
553 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
554 | { | |
1544fdbc | 555 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 556 | mutex_lock(&ec->mutex); |
1544fdbc | 557 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
558 | if (query_bit == handler->query_bit) { |
559 | list_del(&handler->node); | |
560 | kfree(handler); | |
837012ed AS |
561 | } |
562 | } | |
f351d027 | 563 | mutex_unlock(&ec->mutex); |
837012ed AS |
564 | } |
565 | ||
566 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 567 | |
a62e8f19 | 568 | static void acpi_ec_run(void *cxt) |
45bea155 | 569 | { |
a62e8f19 AS |
570 | struct acpi_ec_query_handler *handler = cxt; |
571 | if (!handler) | |
e41334c0 | 572 | return; |
a62e8f19 AS |
573 | pr_debug(PREFIX "start query execution\n"); |
574 | if (handler->func) | |
575 | handler->func(handler->data); | |
576 | else if (handler->handle) | |
577 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
578 | pr_debug(PREFIX "stop query execution\n"); | |
579 | kfree(handler); | |
580 | } | |
581 | ||
582 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
583 | { | |
584 | u8 value = 0; | |
585 | int status; | |
586 | struct acpi_ec_query_handler *handler, *copy; | |
587 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
588 | return status; | |
837012ed AS |
589 | list_for_each_entry(handler, &ec->list, node) { |
590 | if (value == handler->query_bit) { | |
591 | /* have custom handler for this bit */ | |
a62e8f19 AS |
592 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
593 | if (!copy) | |
594 | return -ENOMEM; | |
595 | memcpy(copy, handler, sizeof(*copy)); | |
596 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
597 | return acpi_os_execute((copy->func) ? |
598 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 599 | acpi_ec_run, copy); |
837012ed AS |
600 | } |
601 | } | |
a62e8f19 AS |
602 | return 0; |
603 | } | |
604 | ||
605 | static void acpi_ec_gpe_query(void *ec_cxt) | |
606 | { | |
607 | struct acpi_ec *ec = ec_cxt; | |
608 | if (!ec) | |
609 | return; | |
f351d027 | 610 | mutex_lock(&ec->mutex); |
a62e8f19 | 611 | acpi_ec_sync_query(ec); |
f351d027 | 612 | mutex_unlock(&ec->mutex); |
45bea155 | 613 | } |
1da177e4 | 614 | |
a62e8f19 AS |
615 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
616 | { | |
617 | if (state & ACPI_EC_FLAG_SCI) { | |
618 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
619 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
620 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
621 | acpi_ec_gpe_query, ec); | |
622 | } | |
623 | } | |
624 | return 0; | |
625 | } | |
626 | ||
8b6cd8ad LM |
627 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
628 | u32 gpe_number, void *data) | |
1da177e4 | 629 | { |
3d02b90b | 630 | struct acpi_ec *ec = data; |
b76b51ba | 631 | u8 status = acpi_ec_read_status(ec); |
00eb43a1 | 632 | |
b76b51ba | 633 | pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status); |
7c6db4e0 | 634 | |
b76b51ba | 635 | advance_transaction(ec, status); |
a62e8f19 AS |
636 | if (ec_transaction_done(ec) && |
637 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 638 | wake_up(&ec->wait); |
a62e8f19 AS |
639 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
640 | } | |
bba63a29 | 641 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
642 | } |
643 | ||
1da177e4 LT |
644 | /* -------------------------------------------------------------------------- |
645 | Address Space Management | |
646 | -------------------------------------------------------------------------- */ | |
647 | ||
1da177e4 | 648 | static acpi_status |
5b7734b4 | 649 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 650 | u32 bits, u64 *value64, |
50526df6 | 651 | void *handler_context, void *region_context) |
1da177e4 | 652 | { |
3d02b90b | 653 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
654 | int result = 0, i, bytes = bits / 8; |
655 | u8 *value = (u8 *)value64; | |
1da177e4 | 656 | |
1da177e4 | 657 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 658 | return AE_BAD_PARAMETER; |
1da177e4 | 659 | |
5b7734b4 | 660 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 661 | return AE_BAD_PARAMETER; |
1da177e4 | 662 | |
dadf28a1 | 663 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 664 | acpi_ec_burst_enable(ec); |
b3b233c7 | 665 | |
dadf28a1 AS |
666 | for (i = 0; i < bytes; ++i, ++address, ++value) |
667 | result = (function == ACPI_READ) ? | |
668 | acpi_ec_read(ec, address, value) : | |
669 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 670 | |
dadf28a1 | 671 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 672 | acpi_ec_burst_disable(ec); |
b3b233c7 | 673 | |
1da177e4 LT |
674 | switch (result) { |
675 | case -EINVAL: | |
d550d98d | 676 | return AE_BAD_PARAMETER; |
1da177e4 LT |
677 | break; |
678 | case -ENODEV: | |
d550d98d | 679 | return AE_NOT_FOUND; |
1da177e4 LT |
680 | break; |
681 | case -ETIME: | |
d550d98d | 682 | return AE_TIME; |
1da177e4 LT |
683 | break; |
684 | default: | |
d550d98d | 685 | return AE_OK; |
1da177e4 | 686 | } |
1da177e4 LT |
687 | } |
688 | ||
1da177e4 LT |
689 | /* -------------------------------------------------------------------------- |
690 | Driver Interface | |
691 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
692 | static acpi_status |
693 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
694 | ||
c0900c35 AS |
695 | static struct acpi_ec *make_acpi_ec(void) |
696 | { | |
697 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
698 | if (!ec) | |
699 | return NULL; | |
080e412c | 700 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 701 | mutex_init(&ec->mutex); |
c0900c35 | 702 | init_waitqueue_head(&ec->wait); |
837012ed | 703 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 704 | spin_lock_init(&ec->lock); |
c0900c35 AS |
705 | return ec; |
706 | } | |
837012ed | 707 | |
c019b193 AS |
708 | static acpi_status |
709 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
710 | void *context, void **return_value) | |
711 | { | |
0175d562 LM |
712 | char node_name[5]; |
713 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
714 | struct acpi_ec *ec = context; |
715 | int value = 0; | |
0175d562 LM |
716 | acpi_status status; |
717 | ||
718 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
719 | ||
720 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
721 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
722 | } | |
723 | return AE_OK; | |
724 | } | |
725 | ||
cd8c93a4 AS |
726 | static acpi_status |
727 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 728 | { |
cd8c93a4 | 729 | acpi_status status; |
d21cf3c1 | 730 | unsigned long long tmp = 0; |
cd8c93a4 AS |
731 | |
732 | struct acpi_ec *ec = context; | |
a5032bfd AS |
733 | |
734 | /* clear addr values, ec_parse_io_ports depend on it */ | |
735 | ec->command_addr = ec->data_addr = 0; | |
736 | ||
cd8c93a4 AS |
737 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
738 | ec_parse_io_ports, ec); | |
739 | if (ACPI_FAILURE(status)) | |
740 | return status; | |
837012ed AS |
741 | |
742 | /* Get GPE bit assignment (EC events). */ | |
743 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 744 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
745 | if (ACPI_FAILURE(status)) |
746 | return status; | |
27663c58 | 747 | ec->gpe = tmp; |
837012ed | 748 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 749 | tmp = 0; |
27663c58 MW |
750 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
751 | ec->global_lock = tmp; | |
837012ed | 752 | ec->handle = handle; |
cd8c93a4 | 753 | return AE_CTRL_TERMINATE; |
837012ed AS |
754 | } |
755 | ||
5efc5476 BH |
756 | static int ec_install_handlers(struct acpi_ec *ec) |
757 | { | |
758 | acpi_status status; | |
759 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
760 | return 0; | |
761 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
762 | ACPI_GPE_EDGE_TRIGGERED, | |
763 | &acpi_ec_gpe_handler, ec); | |
764 | if (ACPI_FAILURE(status)) | |
765 | return -ENODEV; | |
9630bdd9 | 766 | |
a44061aa | 767 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
768 | status = acpi_install_address_space_handler(ec->handle, |
769 | ACPI_ADR_SPACE_EC, | |
770 | &acpi_ec_space_handler, | |
771 | NULL, ec); | |
772 | if (ACPI_FAILURE(status)) { | |
773 | if (status == AE_NOT_FOUND) { | |
774 | /* | |
775 | * Maybe OS fails in evaluating the _REG object. | |
776 | * The AE_NOT_FOUND error will be ignored and OS | |
777 | * continue to initialize EC. | |
778 | */ | |
779 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
780 | " of EC device. Broken bios is suspected.\n"); | |
781 | } else { | |
782 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
783 | &acpi_ec_gpe_handler); | |
a44061aa | 784 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
785 | return -ENODEV; |
786 | } | |
787 | } | |
788 | ||
789 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
790 | return 0; | |
791 | } | |
792 | ||
4c611060 AS |
793 | static void ec_remove_handlers(struct acpi_ec *ec) |
794 | { | |
a44061aa | 795 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
796 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
797 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 798 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
799 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
800 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 801 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 802 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
803 | } |
804 | ||
703959d4 | 805 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 806 | { |
703959d4 | 807 | struct acpi_ec *ec = NULL; |
d02be047 | 808 | int ret; |
45bea155 | 809 | |
c0900c35 AS |
810 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
811 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
812 | ||
4c611060 | 813 | /* Check for boot EC */ |
ce52ddf5 AS |
814 | if (boot_ec && |
815 | (boot_ec->handle == device->handle || | |
816 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
817 | ec = boot_ec; | |
818 | boot_ec = NULL; | |
819 | } else { | |
820 | ec = make_acpi_ec(); | |
821 | if (!ec) | |
822 | return -ENOMEM; | |
a5032bfd AS |
823 | } |
824 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
825 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
826 | kfree(ec); |
827 | return -EINVAL; | |
4c611060 AS |
828 | } |
829 | ||
ce52ddf5 AS |
830 | /* Find and register all query methods */ |
831 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 832 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 833 | |
4c611060 AS |
834 | if (!first_ec) |
835 | first_ec = ec; | |
db89b4f0 | 836 | device->driver_data = ec; |
de4f1046 | 837 | |
d6795fe3 AK |
838 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
839 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
840 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
841 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 842 | |
3ebe08a7 | 843 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 844 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
845 | |
846 | ret = ec_install_handlers(ec); | |
847 | ||
848 | /* EC is fully operational, allow queries */ | |
849 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
850 | return ret; | |
1da177e4 LT |
851 | } |
852 | ||
51fac838 | 853 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 854 | { |
01f22462 | 855 | struct acpi_ec *ec; |
07ddf768 | 856 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 857 | |
1da177e4 | 858 | if (!device) |
d550d98d | 859 | return -EINVAL; |
1da177e4 LT |
860 | |
861 | ec = acpi_driver_data(device); | |
cf745ec7 | 862 | ec_remove_handlers(ec); |
f351d027 | 863 | mutex_lock(&ec->mutex); |
07ddf768 | 864 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
865 | list_del(&handler->node); |
866 | kfree(handler); | |
867 | } | |
f351d027 | 868 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
869 | release_region(ec->data_addr, 1); |
870 | release_region(ec->command_addr, 1); | |
db89b4f0 | 871 | device->driver_data = NULL; |
d033879c | 872 | if (ec == first_ec) |
c0900c35 | 873 | first_ec = NULL; |
4c611060 | 874 | kfree(ec); |
d550d98d | 875 | return 0; |
1da177e4 LT |
876 | } |
877 | ||
1da177e4 | 878 | static acpi_status |
c0900c35 | 879 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 880 | { |
3d02b90b | 881 | struct acpi_ec *ec = context; |
1da177e4 | 882 | |
01f22462 | 883 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 884 | return AE_OK; |
1da177e4 LT |
885 | |
886 | /* | |
887 | * The first address region returned is the data port, and | |
888 | * the second address region returned is the status/command | |
889 | * port. | |
890 | */ | |
de4f1046 | 891 | if (ec->data_addr == 0) |
6ffb221a | 892 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 893 | else if (ec->command_addr == 0) |
6ffb221a | 894 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 895 | else |
1da177e4 | 896 | return AE_CTRL_TERMINATE; |
1da177e4 | 897 | |
1da177e4 LT |
898 | return AE_OK; |
899 | } | |
900 | ||
c04209a7 AS |
901 | int __init acpi_boot_ec_enable(void) |
902 | { | |
7c6db4e0 | 903 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
904 | return 0; |
905 | if (!ec_install_handlers(boot_ec)) { | |
906 | first_ec = boot_ec; | |
907 | return 0; | |
908 | } | |
909 | return -EFAULT; | |
910 | } | |
911 | ||
223883b7 AS |
912 | static const struct acpi_device_id ec_device_ids[] = { |
913 | {"PNP0C09", 0}, | |
914 | {"", 0}, | |
915 | }; | |
916 | ||
478fa03b AS |
917 | /* Some BIOS do not survive early DSDT scan, skip it */ |
918 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
919 | { | |
920 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
921 | return 0; | |
922 | } | |
923 | ||
0adf3c74 AS |
924 | /* ASUStek often supplies us with broken ECDT, validate it */ |
925 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
926 | { | |
927 | EC_FLAGS_VALIDATE_ECDT = 1; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | /* MSI EC needs special treatment, enable it */ | |
932 | static int ec_flag_msi(const struct dmi_system_id *id) | |
933 | { | |
55b313f2 | 934 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
935 | EC_FLAGS_MSI = 1; |
936 | EC_FLAGS_VALIDATE_ECDT = 1; | |
937 | return 0; | |
938 | } | |
939 | ||
67bfa9b6 FT |
940 | /* |
941 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
942 | * the GPE storm threshold back to 20 | |
943 | */ | |
944 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
945 | { | |
946 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
947 | ec_storm_threshold = 20; | |
948 | return 0; | |
949 | } | |
950 | ||
6cef7497 | 951 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
952 | { |
953 | ec_skip_dsdt_scan, "Compal JFL92", { | |
954 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
955 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
956 | { |
957 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
958 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
959 | { | |
960 | ec_flag_msi, "MSI hardware", { | |
961 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
962 | { | |
963 | ec_flag_msi, "MSI hardware", { | |
964 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 965 | { |
a5dc4f89 AS |
966 | ec_flag_msi, "MSI hardware", { |
967 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
968 | { | |
534bc4e3 ZR |
969 | ec_flag_msi, "Quanta hardware", { |
970 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
971 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
972 | { | |
973 | ec_flag_msi, "Quanta hardware", { | |
974 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
975 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
976 | { | |
0adf3c74 AS |
977 | ec_validate_ecdt, "ASUS hardware", { |
978 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
979 | { |
980 | ec_validate_ecdt, "ASUS hardware", { | |
981 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
982 | { |
983 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
984 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
985 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
986 | { |
987 | ec_skip_dsdt_scan, "HP Folio 13", { | |
988 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
989 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
990 | { |
991 | ec_validate_ecdt, "ASUS hardware", { | |
992 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
993 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
0adf3c74 AS |
994 | {}, |
995 | }; | |
996 | ||
c0900c35 AS |
997 | int __init acpi_ec_ecdt_probe(void) |
998 | { | |
c0900c35 | 999 | acpi_status status; |
c6cb0e87 | 1000 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1001 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1002 | |
d66d969d AS |
1003 | boot_ec = make_acpi_ec(); |
1004 | if (!boot_ec) | |
c0900c35 AS |
1005 | return -ENOMEM; |
1006 | /* | |
1007 | * Generate a boot ec context | |
1008 | */ | |
0adf3c74 | 1009 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1010 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1011 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1012 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 1013 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1014 | boot_ec->command_addr = ecdt_ptr->control.address; |
1015 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1016 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1017 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1018 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1019 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1020 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1021 | goto install; |
d6bd535d | 1022 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1023 | if (!saved_ec) |
1024 | return -ENOMEM; | |
c5279dee | 1025 | /* fall through */ |
cd8c93a4 | 1026 | } |
0adf3c74 | 1027 | |
478fa03b AS |
1028 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1029 | return -ENODEV; | |
1030 | ||
c5279dee AS |
1031 | /* This workaround is needed only on some broken machines, |
1032 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1033 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1034 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1035 | boot_ec, NULL); | |
1036 | /* Check that acpi_get_devices actually find something */ | |
1037 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1038 | goto error; | |
c6cb0e87 AS |
1039 | if (saved_ec) { |
1040 | /* try to find good ECDT from ASUSTek */ | |
1041 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1042 | saved_ec->data_addr != boot_ec->data_addr || | |
1043 | saved_ec->gpe != boot_ec->gpe || | |
1044 | saved_ec->handle != boot_ec->handle) | |
1045 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1046 | "ECDT tables, which are very hard to workaround. " | |
1047 | "Trying to use DSDT EC info instead. Please send " | |
1048 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1049 | kfree(saved_ec); | |
1050 | saved_ec = NULL; | |
1051 | } else { | |
1052 | /* We really need to limit this workaround, the only ASUS, | |
1053 | * which needs it, has fake EC._INI method, so use it as flag. | |
1054 | * Keep boot_ec struct as it will be needed soon. | |
1055 | */ | |
c6cb0e87 | 1056 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1057 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1058 | return -ENODEV; |
1059 | } | |
c5279dee AS |
1060 | install: |
1061 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1062 | first_ec = boot_ec; |
e8284321 | 1063 | return 0; |
d033879c | 1064 | } |
c5279dee | 1065 | error: |
d66d969d AS |
1066 | kfree(boot_ec); |
1067 | boot_ec = NULL; | |
1da177e4 LT |
1068 | return -ENODEV; |
1069 | } | |
1070 | ||
223883b7 AS |
1071 | static struct acpi_driver acpi_ec_driver = { |
1072 | .name = "ec", | |
1073 | .class = ACPI_EC_CLASS, | |
1074 | .ids = ec_device_ids, | |
1075 | .ops = { | |
1076 | .add = acpi_ec_add, | |
1077 | .remove = acpi_ec_remove, | |
223883b7 AS |
1078 | }, |
1079 | }; | |
1080 | ||
a5f820fe | 1081 | int __init acpi_ec_init(void) |
1da177e4 | 1082 | { |
50526df6 | 1083 | int result = 0; |
1da177e4 | 1084 | |
1da177e4 LT |
1085 | /* Now register the driver for the EC */ |
1086 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1087 | if (result < 0) |
d550d98d | 1088 | return -ENODEV; |
1da177e4 | 1089 | |
d550d98d | 1090 | return result; |
1da177e4 LT |
1091 | } |
1092 | ||
1da177e4 LT |
1093 | /* EC driver currently not unloadable */ |
1094 | #if 0 | |
50526df6 | 1095 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1096 | { |
1da177e4 LT |
1097 | |
1098 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1099 | return; |
1da177e4 | 1100 | } |
7843932a | 1101 | #endif /* 0 */ |