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> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/seq_file.h> | |
451566f4 | 39 | #include <linux/interrupt.h> |
837012ed | 40 | #include <linux/list.h> |
7c6db4e0 | 41 | #include <linux/spinlock.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
eb27cae8 | 45 | #include <linux/dmi.h> |
1da177e4 | 46 | |
1da177e4 | 47 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
48 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
49 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 50 | |
af3fd140 | 51 | #define PREFIX "ACPI: EC: " |
4350933a | 52 | |
703959d4 | 53 | /* EC status register */ |
1da177e4 LT |
54 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
55 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 56 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 57 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 58 | |
703959d4 | 59 | /* EC commands */ |
3261ff4d | 60 | enum ec_command { |
6ccedb10 AS |
61 | ACPI_EC_COMMAND_READ = 0x80, |
62 | ACPI_EC_COMMAND_WRITE = 0x81, | |
63 | ACPI_EC_BURST_ENABLE = 0x82, | |
64 | ACPI_EC_BURST_DISABLE = 0x83, | |
65 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 66 | }; |
837012ed | 67 | |
5c406412 | 68 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
34ff4dbc | 70 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
2a84cb98 | 71 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 72 | |
06cf7d3c | 73 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
74 | per one transaction */ |
75 | ||
080e412c | 76 | enum { |
080e412c | 77 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
78 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
79 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
80 | * OpReg are installed */ | |
1da177e4 | 81 | }; |
6ffb221a DS |
82 | |
83 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 84 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
85 | typedef int (*acpi_ec_query_func) (void *data); |
86 | ||
87 | struct acpi_ec_query_handler { | |
88 | struct list_head node; | |
89 | acpi_ec_query_func func; | |
90 | acpi_handle handle; | |
91 | void *data; | |
92 | u8 query_bit; | |
93 | }; | |
94 | ||
8463200a | 95 | struct transaction { |
7c6db4e0 AS |
96 | const u8 *wdata; |
97 | u8 *rdata; | |
98 | unsigned short irq_count; | |
8463200a | 99 | u8 command; |
a2f93aea AS |
100 | u8 wi; |
101 | u8 ri; | |
7c6db4e0 AS |
102 | u8 wlen; |
103 | u8 rlen; | |
dd15f8c4 | 104 | bool done; |
7c6db4e0 AS |
105 | }; |
106 | ||
a854e08a | 107 | static struct acpi_ec { |
703959d4 | 108 | acpi_handle handle; |
a86e2772 | 109 | unsigned long gpe; |
6ffb221a DS |
110 | unsigned long command_addr; |
111 | unsigned long data_addr; | |
703959d4 | 112 | unsigned long global_lock; |
080e412c | 113 | unsigned long flags; |
c787a855 | 114 | struct mutex lock; |
703959d4 | 115 | wait_queue_head_t wait; |
837012ed | 116 | struct list_head list; |
8463200a AS |
117 | struct transaction *curr; |
118 | spinlock_t curr_lock; | |
d033879c | 119 | } *boot_ec, *first_ec; |
703959d4 | 120 | |
5423a0cb | 121 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 122 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
5423a0cb | 123 | |
1da177e4 LT |
124 | /* -------------------------------------------------------------------------- |
125 | Transaction Management | |
126 | -------------------------------------------------------------------------- */ | |
127 | ||
6ffb221a | 128 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 129 | { |
3ebe08a7 | 130 | u8 x = inb(ec->command_addr); |
86dae015 | 131 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 132 | return x; |
451566f4 DT |
133 | } |
134 | ||
6ffb221a | 135 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 136 | { |
3ebe08a7 | 137 | u8 x = inb(ec->data_addr); |
86dae015 | 138 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 139 | return x; |
7c6db5e5 DS |
140 | } |
141 | ||
6ffb221a | 142 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 143 | { |
86dae015 | 144 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 145 | outb(command, ec->command_addr); |
45bea155 LY |
146 | } |
147 | ||
6ffb221a | 148 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 149 | { |
86dae015 | 150 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 151 | outb(data, ec->data_addr); |
703959d4 | 152 | } |
45bea155 | 153 | |
7c6db4e0 | 154 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 155 | { |
7c6db4e0 AS |
156 | unsigned long flags; |
157 | int ret = 0; | |
8463200a | 158 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 159 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 160 | ret = 1; |
8463200a | 161 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 162 | return ret; |
45bea155 | 163 | } |
451566f4 | 164 | |
a2f93aea AS |
165 | static void start_transaction(struct acpi_ec *ec) |
166 | { | |
167 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
168 | ec->curr->done = false; | |
169 | acpi_ec_write_cmd(ec, ec->curr->command); | |
170 | } | |
171 | ||
2a84cb98 | 172 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 173 | { |
7c6db4e0 | 174 | unsigned long flags; |
8463200a AS |
175 | spin_lock_irqsave(&ec->curr_lock, flags); |
176 | if (!ec->curr) | |
7c6db4e0 | 177 | goto unlock; |
a2f93aea AS |
178 | if (ec->curr->wlen > ec->curr->wi) { |
179 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
180 | acpi_ec_write_data(ec, | |
181 | ec->curr->wdata[ec->curr->wi++]); | |
182 | else | |
dd15f8c4 | 183 | goto err; |
a2f93aea | 184 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 185 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
186 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
187 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 188 | ec->curr->done = true; |
7c6db4e0 | 189 | } else |
dd15f8c4 | 190 | goto err; |
a2f93aea AS |
191 | } else if (ec->curr->wlen == ec->curr->wi && |
192 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
193 | ec->curr->done = true; |
194 | goto unlock; | |
195 | err: | |
196 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
197 | if (in_interrupt()) |
198 | ++ec->curr->irq_count; | |
7c6db4e0 | 199 | unlock: |
8463200a | 200 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 201 | } |
03d1d99c | 202 | |
7c6db4e0 AS |
203 | static void acpi_ec_gpe_query(void *ec_cxt); |
204 | ||
205 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 206 | { |
7c6db4e0 AS |
207 | if (state & ACPI_EC_FLAG_SCI) { |
208 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
209 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
210 | acpi_ec_gpe_query, ec); | |
211 | } | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static int ec_poll(struct acpi_ec *ec) | |
216 | { | |
2a84cb98 AS |
217 | unsigned long flags; |
218 | int repeat = 2; /* number of command restarts */ | |
219 | while (repeat--) { | |
220 | unsigned long delay = jiffies + | |
221 | msecs_to_jiffies(ACPI_EC_DELAY); | |
222 | do { | |
223 | /* don't sleep with disabled interrupts */ | |
224 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
225 | udelay(ACPI_EC_MSI_UDELAY); | |
226 | if (ec_transaction_done(ec)) | |
227 | return 0; | |
228 | } else { | |
229 | if (wait_event_timeout(ec->wait, | |
230 | ec_transaction_done(ec), | |
231 | msecs_to_jiffies(1))) | |
232 | return 0; | |
233 | } | |
234 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
235 | } while (time_before(jiffies, delay)); | |
236 | if (!ec->curr->irq_count || | |
237 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) | |
238 | break; | |
239 | /* try restart command if we get any false interrupts */ | |
240 | pr_debug(PREFIX "controller reset, restart transaction\n"); | |
241 | spin_lock_irqsave(&ec->curr_lock, flags); | |
242 | start_transaction(ec); | |
243 | spin_unlock_irqrestore(&ec->curr_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; |
3ebe08a7 | 253 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
254 | /* disable GPE during transaction if storm is detected */ |
255 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
0b7084ac | 256 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 257 | } |
5423a0cb | 258 | if (EC_FLAGS_MSI) |
2a84cb98 | 259 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 260 | /* start transaction */ |
8463200a | 261 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 262 | /* following two actions should be kept atomic */ |
8463200a | 263 | ec->curr = t; |
a2f93aea | 264 | start_transaction(ec); |
8463200a | 265 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 266 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 267 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 268 | ret = ec_poll(ec); |
3ebe08a7 | 269 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
270 | spin_lock_irqsave(&ec->curr_lock, tmp); |
271 | ec->curr = NULL; | |
272 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
273 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
274 | /* check if we received SCI during transaction */ | |
275 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
276 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 277 | acpi_enable_gpe(NULL, ec->gpe); |
2a84cb98 | 278 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
279 | pr_info(PREFIX "GPE storm detected, " |
280 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
281 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
282 | } | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int ec_check_ibf0(struct acpi_ec *ec) | |
287 | { | |
288 | u8 status = acpi_ec_read_status(ec); | |
289 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
290 | } |
291 | ||
c0ff1772 AS |
292 | static int ec_wait_ibf0(struct acpi_ec *ec) |
293 | { | |
294 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
295 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 296 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
297 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
298 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
299 | return 0; |
300 | return -ETIME; | |
45bea155 LY |
301 | } |
302 | ||
2a84cb98 | 303 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 304 | { |
d7a76e4c | 305 | int status; |
50526df6 | 306 | u32 glk; |
8463200a | 307 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 308 | return -EINVAL; |
8463200a AS |
309 | if (t->rdata) |
310 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 311 | mutex_lock(&ec->lock); |
703959d4 | 312 | if (ec->global_lock) { |
1da177e4 | 313 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 314 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
315 | status = -ENODEV; |
316 | goto unlock; | |
c24e912b | 317 | } |
1da177e4 | 318 | } |
c0ff1772 | 319 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
320 | pr_err(PREFIX "input buffer is not empty, " |
321 | "aborting transaction\n"); | |
7c6db4e0 | 322 | status = -ETIME; |
451566f4 | 323 | goto end; |
716e084e | 324 | } |
2a84cb98 | 325 | status = acpi_ec_transaction_unlocked(ec, t); |
7c6db4e0 | 326 | end: |
703959d4 | 327 | if (ec->global_lock) |
1da177e4 | 328 | acpi_release_global_lock(glk); |
7c6db4e0 | 329 | unlock: |
523953b4 | 330 | mutex_unlock(&ec->lock); |
d550d98d | 331 | return status; |
1da177e4 LT |
332 | } |
333 | ||
8a383ef0 | 334 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
335 | { |
336 | u8 d; | |
8463200a AS |
337 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
338 | .wdata = NULL, .rdata = &d, | |
339 | .wlen = 0, .rlen = 1}; | |
340 | ||
2a84cb98 | 341 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
342 | } |
343 | ||
8a383ef0 | 344 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 345 | { |
8463200a AS |
346 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
347 | .wdata = NULL, .rdata = NULL, | |
348 | .wlen = 0, .rlen = 0}; | |
349 | ||
7c6db4e0 | 350 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 351 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
352 | } |
353 | ||
6ccedb10 | 354 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
355 | { |
356 | int result; | |
357 | u8 d; | |
8463200a AS |
358 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
359 | .wdata = &address, .rdata = &d, | |
360 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 361 | |
2a84cb98 | 362 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
363 | *data = d; |
364 | return result; | |
365 | } | |
6ffb221a | 366 | |
3576cf61 DS |
367 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
368 | { | |
6ccedb10 | 369 | u8 wdata[2] = { address, data }; |
8463200a AS |
370 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
371 | .wdata = wdata, .rdata = NULL, | |
372 | .wlen = 2, .rlen = 0}; | |
373 | ||
2a84cb98 | 374 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
375 | } |
376 | ||
1da177e4 LT |
377 | /* |
378 | * Externally callable EC access functions. For now, assume 1 EC only | |
379 | */ | |
c45aac43 AS |
380 | int ec_burst_enable(void) |
381 | { | |
c45aac43 AS |
382 | if (!first_ec) |
383 | return -ENODEV; | |
d033879c | 384 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
385 | } |
386 | ||
387 | EXPORT_SYMBOL(ec_burst_enable); | |
388 | ||
389 | int ec_burst_disable(void) | |
390 | { | |
c45aac43 AS |
391 | if (!first_ec) |
392 | return -ENODEV; | |
d033879c | 393 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
394 | } |
395 | ||
396 | EXPORT_SYMBOL(ec_burst_disable); | |
397 | ||
6ccedb10 | 398 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 399 | { |
1da177e4 | 400 | int err; |
6ffb221a | 401 | u8 temp_data; |
1da177e4 LT |
402 | |
403 | if (!first_ec) | |
404 | return -ENODEV; | |
405 | ||
d033879c | 406 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
407 | |
408 | if (!err) { | |
409 | *val = temp_data; | |
410 | return 0; | |
50526df6 | 411 | } else |
1da177e4 LT |
412 | return err; |
413 | } | |
50526df6 | 414 | |
1da177e4 LT |
415 | EXPORT_SYMBOL(ec_read); |
416 | ||
50526df6 | 417 | int ec_write(u8 addr, u8 val) |
1da177e4 | 418 | { |
1da177e4 LT |
419 | int err; |
420 | ||
421 | if (!first_ec) | |
422 | return -ENODEV; | |
423 | ||
d033879c | 424 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
425 | |
426 | return err; | |
427 | } | |
50526df6 | 428 | |
1da177e4 LT |
429 | EXPORT_SYMBOL(ec_write); |
430 | ||
616362de | 431 | int ec_transaction(u8 command, |
9e197219 | 432 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
433 | u8 * rdata, unsigned rdata_len, |
434 | int force_poll) | |
45bea155 | 435 | { |
8463200a AS |
436 | struct transaction t = {.command = command, |
437 | .wdata = wdata, .rdata = rdata, | |
438 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
439 | if (!first_ec) |
440 | return -ENODEV; | |
45bea155 | 441 | |
2a84cb98 | 442 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 443 | } |
1da177e4 | 444 | |
ab9e43c6 LP |
445 | EXPORT_SYMBOL(ec_transaction); |
446 | ||
6ccedb10 | 447 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
448 | { |
449 | int result; | |
6ccedb10 | 450 | u8 d; |
8463200a AS |
451 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
452 | .wdata = NULL, .rdata = &d, | |
453 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
454 | if (!ec || !data) |
455 | return -EINVAL; | |
1da177e4 | 456 | |
6ccedb10 AS |
457 | /* |
458 | * Query the EC to find out which _Qxx method we need to evaluate. | |
459 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
460 | * bit to be cleared (and thus clearing the interrupt source). | |
461 | */ | |
716e084e | 462 | |
2a84cb98 | 463 | result = acpi_ec_transaction(ec, &t); |
6ccedb10 AS |
464 | if (result) |
465 | return result; | |
1da177e4 | 466 | |
6ccedb10 AS |
467 | if (!d) |
468 | return -ENODATA; | |
1da177e4 | 469 | |
6ccedb10 AS |
470 | *data = d; |
471 | return 0; | |
1da177e4 LT |
472 | } |
473 | ||
1da177e4 LT |
474 | /* -------------------------------------------------------------------------- |
475 | Event Management | |
476 | -------------------------------------------------------------------------- */ | |
837012ed AS |
477 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
478 | acpi_handle handle, acpi_ec_query_func func, | |
479 | void *data) | |
480 | { | |
481 | struct acpi_ec_query_handler *handler = | |
482 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
483 | if (!handler) | |
484 | return -ENOMEM; | |
485 | ||
486 | handler->query_bit = query_bit; | |
487 | handler->handle = handle; | |
488 | handler->func = func; | |
489 | handler->data = data; | |
490 | mutex_lock(&ec->lock); | |
30c08574 | 491 | list_add(&handler->node, &ec->list); |
837012ed AS |
492 | mutex_unlock(&ec->lock); |
493 | return 0; | |
494 | } | |
495 | ||
496 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
497 | ||
498 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
499 | { | |
1544fdbc | 500 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 501 | mutex_lock(&ec->lock); |
1544fdbc | 502 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
503 | if (query_bit == handler->query_bit) { |
504 | list_del(&handler->node); | |
505 | kfree(handler); | |
837012ed AS |
506 | } |
507 | } | |
508 | mutex_unlock(&ec->lock); | |
509 | } | |
510 | ||
511 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 512 | |
50526df6 | 513 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 514 | { |
3d02b90b | 515 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 516 | u8 value = 0; |
837012ed | 517 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 518 | |
5d0c288b | 519 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 520 | return; |
837012ed AS |
521 | mutex_lock(&ec->lock); |
522 | list_for_each_entry(handler, &ec->list, node) { | |
523 | if (value == handler->query_bit) { | |
524 | /* have custom handler for this bit */ | |
525 | memcpy(©, handler, sizeof(copy)); | |
526 | mutex_unlock(&ec->lock); | |
527 | if (copy.func) { | |
528 | copy.func(copy.data); | |
529 | } else if (copy.handle) { | |
530 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
531 | } | |
532 | return; | |
533 | } | |
534 | } | |
535 | mutex_unlock(&ec->lock); | |
45bea155 | 536 | } |
1da177e4 | 537 | |
50526df6 | 538 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 539 | { |
3d02b90b | 540 | struct acpi_ec *ec = data; |
7c6db4e0 | 541 | u8 status; |
00eb43a1 | 542 | |
3ebe08a7 | 543 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
544 | status = acpi_ec_read_status(ec); |
545 | ||
2a84cb98 AS |
546 | advance_transaction(ec, status); |
547 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
548 | wake_up(&ec->wait); | |
7c6db4e0 | 549 | ec_check_sci(ec, status); |
7c6db4e0 | 550 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
551 | } |
552 | ||
1da177e4 LT |
553 | /* -------------------------------------------------------------------------- |
554 | Address Space Management | |
555 | -------------------------------------------------------------------------- */ | |
556 | ||
1da177e4 | 557 | static acpi_status |
5b7734b4 AS |
558 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
559 | u32 bits, acpi_integer *value, | |
50526df6 | 560 | void *handler_context, void *region_context) |
1da177e4 | 561 | { |
3d02b90b | 562 | struct acpi_ec *ec = handler_context; |
3e71a87d | 563 | int result = 0, i; |
5b7734b4 | 564 | u8 temp = 0; |
1da177e4 | 565 | |
1da177e4 | 566 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 567 | return AE_BAD_PARAMETER; |
1da177e4 | 568 | |
5b7734b4 | 569 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 570 | return AE_BAD_PARAMETER; |
1da177e4 | 571 | |
5b7734b4 AS |
572 | if (bits != 8 && acpi_strict) |
573 | return AE_BAD_PARAMETER; | |
1da177e4 | 574 | |
6a63b06f AS |
575 | if (EC_FLAGS_MSI) |
576 | acpi_ec_burst_enable(ec); | |
b3b233c7 | 577 | |
3e71a87d AS |
578 | if (function == ACPI_READ) { |
579 | result = acpi_ec_read(ec, address, &temp); | |
580 | *value = temp; | |
581 | } else { | |
582 | temp = 0xff & (*value); | |
583 | result = acpi_ec_write(ec, address, temp); | |
584 | } | |
585 | ||
586 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
587 | ++address; | |
5b7734b4 AS |
588 | if (function == ACPI_READ) { |
589 | result = acpi_ec_read(ec, address, &temp); | |
590 | (*value) |= ((acpi_integer)temp) << i; | |
591 | } else { | |
592 | temp = 0xff & ((*value) >> i); | |
593 | result = acpi_ec_write(ec, address, temp); | |
594 | } | |
1da177e4 LT |
595 | } |
596 | ||
6a63b06f AS |
597 | if (EC_FLAGS_MSI) |
598 | acpi_ec_burst_disable(ec); | |
b3b233c7 | 599 | |
1da177e4 LT |
600 | switch (result) { |
601 | case -EINVAL: | |
d550d98d | 602 | return AE_BAD_PARAMETER; |
1da177e4 LT |
603 | break; |
604 | case -ENODEV: | |
d550d98d | 605 | return AE_NOT_FOUND; |
1da177e4 LT |
606 | break; |
607 | case -ETIME: | |
d550d98d | 608 | return AE_TIME; |
1da177e4 LT |
609 | break; |
610 | default: | |
d550d98d | 611 | return AE_OK; |
1da177e4 | 612 | } |
1da177e4 LT |
613 | } |
614 | ||
1da177e4 LT |
615 | /* -------------------------------------------------------------------------- |
616 | FS Interface (/proc) | |
617 | -------------------------------------------------------------------------- */ | |
618 | ||
50526df6 | 619 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 620 | |
50526df6 | 621 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 622 | { |
3d02b90b | 623 | struct acpi_ec *ec = seq->private; |
1da177e4 | 624 | |
1da177e4 LT |
625 | if (!ec) |
626 | goto end; | |
627 | ||
01f22462 AS |
628 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
629 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
630 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
631 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 632 | ec->global_lock ? "yes" : "no"); |
50526df6 | 633 | end: |
d550d98d | 634 | return 0; |
1da177e4 LT |
635 | } |
636 | ||
637 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
638 | { | |
639 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
640 | } | |
641 | ||
070d8eb1 | 642 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
643 | .open = acpi_ec_info_open_fs, |
644 | .read = seq_read, | |
645 | .llseek = seq_lseek, | |
646 | .release = single_release, | |
1da177e4 LT |
647 | .owner = THIS_MODULE, |
648 | }; | |
649 | ||
50526df6 | 650 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 651 | { |
50526df6 | 652 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 653 | |
1da177e4 LT |
654 | if (!acpi_device_dir(device)) { |
655 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 656 | acpi_ec_dir); |
1da177e4 | 657 | if (!acpi_device_dir(device)) |
d550d98d | 658 | return -ENODEV; |
1da177e4 LT |
659 | } |
660 | ||
cf7acfab DL |
661 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
662 | acpi_device_dir(device), | |
663 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 664 | if (!entry) |
d550d98d | 665 | return -ENODEV; |
d550d98d | 666 | return 0; |
1da177e4 LT |
667 | } |
668 | ||
50526df6 | 669 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 670 | { |
1da177e4 LT |
671 | |
672 | if (acpi_device_dir(device)) { | |
673 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
674 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
675 | acpi_device_dir(device) = NULL; | |
676 | } | |
677 | ||
d550d98d | 678 | return 0; |
1da177e4 LT |
679 | } |
680 | ||
1da177e4 LT |
681 | /* -------------------------------------------------------------------------- |
682 | Driver Interface | |
683 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
684 | static acpi_status |
685 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
686 | ||
c0900c35 AS |
687 | static struct acpi_ec *make_acpi_ec(void) |
688 | { | |
689 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
690 | if (!ec) | |
691 | return NULL; | |
080e412c | 692 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
693 | mutex_init(&ec->lock); |
694 | init_waitqueue_head(&ec->wait); | |
837012ed | 695 | INIT_LIST_HEAD(&ec->list); |
8463200a | 696 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
697 | return ec; |
698 | } | |
837012ed | 699 | |
c019b193 AS |
700 | static acpi_status |
701 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
702 | void *context, void **return_value) | |
703 | { | |
0175d562 LM |
704 | char node_name[5]; |
705 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
706 | struct acpi_ec *ec = context; |
707 | int value = 0; | |
0175d562 LM |
708 | acpi_status status; |
709 | ||
710 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
711 | ||
712 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
713 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
714 | } | |
715 | return AE_OK; | |
716 | } | |
717 | ||
cd8c93a4 AS |
718 | static acpi_status |
719 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 720 | { |
cd8c93a4 | 721 | acpi_status status; |
d21cf3c1 | 722 | unsigned long long tmp = 0; |
cd8c93a4 AS |
723 | |
724 | struct acpi_ec *ec = context; | |
a5032bfd AS |
725 | |
726 | /* clear addr values, ec_parse_io_ports depend on it */ | |
727 | ec->command_addr = ec->data_addr = 0; | |
728 | ||
cd8c93a4 AS |
729 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
730 | ec_parse_io_ports, ec); | |
731 | if (ACPI_FAILURE(status)) | |
732 | return status; | |
837012ed AS |
733 | |
734 | /* Get GPE bit assignment (EC events). */ | |
735 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 736 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
737 | if (ACPI_FAILURE(status)) |
738 | return status; | |
27663c58 | 739 | ec->gpe = tmp; |
837012ed | 740 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 741 | tmp = 0; |
27663c58 MW |
742 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
743 | ec->global_lock = tmp; | |
837012ed | 744 | ec->handle = handle; |
cd8c93a4 | 745 | return AE_CTRL_TERMINATE; |
837012ed AS |
746 | } |
747 | ||
5efc5476 BH |
748 | static int ec_install_handlers(struct acpi_ec *ec) |
749 | { | |
750 | acpi_status status; | |
751 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
752 | return 0; | |
753 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
754 | ACPI_GPE_EDGE_TRIGGERED, | |
755 | &acpi_ec_gpe_handler, ec); | |
756 | if (ACPI_FAILURE(status)) | |
757 | return -ENODEV; | |
758 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
759 | acpi_enable_gpe(NULL, ec->gpe); | |
760 | status = acpi_install_address_space_handler(ec->handle, | |
761 | ACPI_ADR_SPACE_EC, | |
762 | &acpi_ec_space_handler, | |
763 | NULL, ec); | |
764 | if (ACPI_FAILURE(status)) { | |
765 | if (status == AE_NOT_FOUND) { | |
766 | /* | |
767 | * Maybe OS fails in evaluating the _REG object. | |
768 | * The AE_NOT_FOUND error will be ignored and OS | |
769 | * continue to initialize EC. | |
770 | */ | |
771 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
772 | " of EC device. Broken bios is suspected.\n"); | |
773 | } else { | |
774 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
775 | &acpi_ec_gpe_handler); | |
776 | return -ENODEV; | |
777 | } | |
778 | } | |
779 | ||
780 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
781 | return 0; | |
782 | } | |
783 | ||
4c611060 AS |
784 | static void ec_remove_handlers(struct acpi_ec *ec) |
785 | { | |
786 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
787 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 788 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
789 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
790 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 791 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 792 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
793 | } |
794 | ||
703959d4 | 795 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 796 | { |
703959d4 | 797 | struct acpi_ec *ec = NULL; |
d02be047 | 798 | int ret; |
45bea155 | 799 | |
c0900c35 AS |
800 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
801 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
802 | ||
4c611060 | 803 | /* Check for boot EC */ |
ce52ddf5 AS |
804 | if (boot_ec && |
805 | (boot_ec->handle == device->handle || | |
806 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
807 | ec = boot_ec; | |
808 | boot_ec = NULL; | |
809 | } else { | |
810 | ec = make_acpi_ec(); | |
811 | if (!ec) | |
812 | return -ENOMEM; | |
a5032bfd AS |
813 | } |
814 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
815 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
816 | kfree(ec); |
817 | return -EINVAL; | |
4c611060 AS |
818 | } |
819 | ||
c0900c35 | 820 | ec->handle = device->handle; |
ce52ddf5 AS |
821 | |
822 | /* Find and register all query methods */ | |
823 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
824 | acpi_ec_register_query_methods, ec, NULL); | |
825 | ||
4c611060 AS |
826 | if (!first_ec) |
827 | first_ec = ec; | |
db89b4f0 | 828 | device->driver_data = ec; |
c0900c35 | 829 | acpi_ec_add_fs(device); |
3ebe08a7 | 830 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 831 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
832 | |
833 | ret = ec_install_handlers(ec); | |
834 | ||
835 | /* EC is fully operational, allow queries */ | |
836 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
837 | return ret; | |
1da177e4 LT |
838 | } |
839 | ||
50526df6 | 840 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 841 | { |
01f22462 | 842 | struct acpi_ec *ec; |
07ddf768 | 843 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 844 | |
1da177e4 | 845 | if (!device) |
d550d98d | 846 | return -EINVAL; |
1da177e4 LT |
847 | |
848 | ec = acpi_driver_data(device); | |
cf745ec7 | 849 | ec_remove_handlers(ec); |
837012ed | 850 | mutex_lock(&ec->lock); |
07ddf768 | 851 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
852 | list_del(&handler->node); |
853 | kfree(handler); | |
854 | } | |
855 | mutex_unlock(&ec->lock); | |
1da177e4 | 856 | acpi_ec_remove_fs(device); |
db89b4f0 | 857 | device->driver_data = NULL; |
d033879c | 858 | if (ec == first_ec) |
c0900c35 | 859 | first_ec = NULL; |
4c611060 | 860 | kfree(ec); |
d550d98d | 861 | return 0; |
1da177e4 LT |
862 | } |
863 | ||
1da177e4 | 864 | static acpi_status |
c0900c35 | 865 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 866 | { |
3d02b90b | 867 | struct acpi_ec *ec = context; |
1da177e4 | 868 | |
01f22462 | 869 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 870 | return AE_OK; |
1da177e4 LT |
871 | |
872 | /* | |
873 | * The first address region returned is the data port, and | |
874 | * the second address region returned is the status/command | |
875 | * port. | |
876 | */ | |
01f22462 | 877 | if (ec->data_addr == 0) |
6ffb221a | 878 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 879 | else if (ec->command_addr == 0) |
6ffb221a | 880 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 881 | else |
1da177e4 | 882 | return AE_CTRL_TERMINATE; |
1da177e4 | 883 | |
1da177e4 LT |
884 | return AE_OK; |
885 | } | |
886 | ||
c04209a7 AS |
887 | int __init acpi_boot_ec_enable(void) |
888 | { | |
7c6db4e0 | 889 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
890 | return 0; |
891 | if (!ec_install_handlers(boot_ec)) { | |
892 | first_ec = boot_ec; | |
893 | return 0; | |
894 | } | |
895 | return -EFAULT; | |
896 | } | |
897 | ||
223883b7 AS |
898 | static const struct acpi_device_id ec_device_ids[] = { |
899 | {"PNP0C09", 0}, | |
900 | {"", 0}, | |
901 | }; | |
902 | ||
0adf3c74 AS |
903 | /* ASUStek often supplies us with broken ECDT, validate it */ |
904 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
905 | { | |
906 | EC_FLAGS_VALIDATE_ECDT = 1; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /* MSI EC needs special treatment, enable it */ | |
911 | static int ec_flag_msi(const struct dmi_system_id *id) | |
912 | { | |
913 | EC_FLAGS_MSI = 1; | |
914 | EC_FLAGS_VALIDATE_ECDT = 1; | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
919 | { | |
920 | ec_flag_msi, "MSI hardware", { | |
921 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star"), | |
922 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star") }, NULL}, | |
923 | { | |
924 | ec_validate_ecdt, "ASUS hardware", { | |
925 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
926 | {}, | |
927 | }; | |
928 | ||
929 | ||
c0900c35 AS |
930 | int __init acpi_ec_ecdt_probe(void) |
931 | { | |
c0900c35 | 932 | acpi_status status; |
c6cb0e87 | 933 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 934 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 935 | |
d66d969d AS |
936 | boot_ec = make_acpi_ec(); |
937 | if (!boot_ec) | |
c0900c35 AS |
938 | return -ENOMEM; |
939 | /* | |
940 | * Generate a boot ec context | |
941 | */ | |
0adf3c74 | 942 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
943 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
944 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 945 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 946 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
947 | boot_ec->command_addr = ecdt_ptr->control.address; |
948 | boot_ec->data_addr = ecdt_ptr->data.address; | |
949 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 950 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 951 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 952 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 953 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 954 | goto install; |
c6cb0e87 AS |
955 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
956 | if (!saved_ec) | |
957 | return -ENOMEM; | |
a5032bfd | 958 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 959 | /* fall through */ |
cd8c93a4 | 960 | } |
0adf3c74 | 961 | |
c5279dee AS |
962 | /* This workaround is needed only on some broken machines, |
963 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
964 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
965 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
966 | boot_ec, NULL); | |
967 | /* Check that acpi_get_devices actually find something */ | |
968 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
969 | goto error; | |
c6cb0e87 AS |
970 | if (saved_ec) { |
971 | /* try to find good ECDT from ASUSTek */ | |
972 | if (saved_ec->command_addr != boot_ec->command_addr || | |
973 | saved_ec->data_addr != boot_ec->data_addr || | |
974 | saved_ec->gpe != boot_ec->gpe || | |
975 | saved_ec->handle != boot_ec->handle) | |
976 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
977 | "ECDT tables, which are very hard to workaround. " | |
978 | "Trying to use DSDT EC info instead. Please send " | |
979 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
980 | kfree(saved_ec); | |
981 | saved_ec = NULL; | |
982 | } else { | |
983 | /* We really need to limit this workaround, the only ASUS, | |
984 | * which needs it, has fake EC._INI method, so use it as flag. | |
985 | * Keep boot_ec struct as it will be needed soon. | |
986 | */ | |
987 | acpi_handle dummy; | |
988 | if (!dmi_name_in_vendors("ASUS") || | |
989 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
990 | &dummy))) | |
991 | return -ENODEV; | |
992 | } | |
c5279dee AS |
993 | install: |
994 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 995 | first_ec = boot_ec; |
e8284321 | 996 | return 0; |
d033879c | 997 | } |
c5279dee | 998 | error: |
d66d969d AS |
999 | kfree(boot_ec); |
1000 | boot_ec = NULL; | |
1da177e4 LT |
1001 | return -ENODEV; |
1002 | } | |
1003 | ||
223883b7 AS |
1004 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1005 | { | |
1006 | struct acpi_ec *ec = acpi_driver_data(device); | |
1007 | /* Stop using GPE */ | |
0b7084ac | 1008 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1009 | return 0; |
1010 | } | |
1011 | ||
1012 | static int acpi_ec_resume(struct acpi_device *device) | |
1013 | { | |
1014 | struct acpi_ec *ec = acpi_driver_data(device); | |
1015 | /* Enable use of GPE back */ | |
0b7084ac | 1016 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1017 | return 0; |
1018 | } | |
1019 | ||
1020 | static struct acpi_driver acpi_ec_driver = { | |
1021 | .name = "ec", | |
1022 | .class = ACPI_EC_CLASS, | |
1023 | .ids = ec_device_ids, | |
1024 | .ops = { | |
1025 | .add = acpi_ec_add, | |
1026 | .remove = acpi_ec_remove, | |
223883b7 AS |
1027 | .suspend = acpi_ec_suspend, |
1028 | .resume = acpi_ec_resume, | |
1029 | }, | |
1030 | }; | |
1031 | ||
a5f820fe | 1032 | int __init acpi_ec_init(void) |
1da177e4 | 1033 | { |
50526df6 | 1034 | int result = 0; |
1da177e4 | 1035 | |
1da177e4 LT |
1036 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1037 | if (!acpi_ec_dir) | |
d550d98d | 1038 | return -ENODEV; |
1da177e4 LT |
1039 | |
1040 | /* Now register the driver for the EC */ | |
1041 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1042 | if (result < 0) { | |
1043 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1044 | return -ENODEV; |
1da177e4 LT |
1045 | } |
1046 | ||
d550d98d | 1047 | return result; |
1da177e4 LT |
1048 | } |
1049 | ||
1da177e4 LT |
1050 | /* EC driver currently not unloadable */ |
1051 | #if 0 | |
50526df6 | 1052 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1053 | { |
1da177e4 LT |
1054 | |
1055 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1056 | ||
1057 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1058 | ||
d550d98d | 1059 | return; |
1da177e4 | 1060 | } |
7843932a | 1061 | #endif /* 0 */ |