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Commit | Line | Data |
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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 */ |
478fa03b | 123 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 124 | |
1da177e4 LT |
125 | /* -------------------------------------------------------------------------- |
126 | Transaction Management | |
127 | -------------------------------------------------------------------------- */ | |
128 | ||
6ffb221a | 129 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 130 | { |
3ebe08a7 | 131 | u8 x = inb(ec->command_addr); |
86dae015 | 132 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 133 | return x; |
451566f4 DT |
134 | } |
135 | ||
6ffb221a | 136 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 137 | { |
3ebe08a7 | 138 | u8 x = inb(ec->data_addr); |
86dae015 | 139 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 140 | return x; |
7c6db5e5 DS |
141 | } |
142 | ||
6ffb221a | 143 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 144 | { |
86dae015 | 145 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 146 | outb(command, ec->command_addr); |
45bea155 LY |
147 | } |
148 | ||
6ffb221a | 149 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 150 | { |
86dae015 | 151 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 152 | outb(data, ec->data_addr); |
703959d4 | 153 | } |
45bea155 | 154 | |
7c6db4e0 | 155 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 156 | { |
7c6db4e0 AS |
157 | unsigned long flags; |
158 | int ret = 0; | |
8463200a | 159 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 160 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 161 | ret = 1; |
8463200a | 162 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 163 | return ret; |
45bea155 | 164 | } |
451566f4 | 165 | |
a2f93aea AS |
166 | static void start_transaction(struct acpi_ec *ec) |
167 | { | |
168 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
169 | ec->curr->done = false; | |
170 | acpi_ec_write_cmd(ec, ec->curr->command); | |
171 | } | |
172 | ||
2a84cb98 | 173 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 174 | { |
7c6db4e0 | 175 | unsigned long flags; |
8463200a AS |
176 | spin_lock_irqsave(&ec->curr_lock, flags); |
177 | if (!ec->curr) | |
7c6db4e0 | 178 | goto unlock; |
a2f93aea AS |
179 | if (ec->curr->wlen > ec->curr->wi) { |
180 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
181 | acpi_ec_write_data(ec, | |
182 | ec->curr->wdata[ec->curr->wi++]); | |
183 | else | |
dd15f8c4 | 184 | goto err; |
a2f93aea | 185 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 186 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
187 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
188 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 189 | ec->curr->done = true; |
7c6db4e0 | 190 | } else |
dd15f8c4 | 191 | goto err; |
a2f93aea AS |
192 | } else if (ec->curr->wlen == ec->curr->wi && |
193 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
194 | ec->curr->done = true; |
195 | goto unlock; | |
196 | err: | |
197 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
198 | if (in_interrupt()) |
199 | ++ec->curr->irq_count; | |
7c6db4e0 | 200 | unlock: |
8463200a | 201 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 202 | } |
03d1d99c | 203 | |
7c6db4e0 AS |
204 | static void acpi_ec_gpe_query(void *ec_cxt); |
205 | ||
206 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 207 | { |
7c6db4e0 AS |
208 | if (state & ACPI_EC_FLAG_SCI) { |
209 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
210 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
211 | acpi_ec_gpe_query, ec); | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static int ec_poll(struct acpi_ec *ec) | |
217 | { | |
2a84cb98 AS |
218 | unsigned long flags; |
219 | int repeat = 2; /* number of command restarts */ | |
220 | while (repeat--) { | |
221 | unsigned long delay = jiffies + | |
222 | msecs_to_jiffies(ACPI_EC_DELAY); | |
223 | do { | |
224 | /* don't sleep with disabled interrupts */ | |
225 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
226 | udelay(ACPI_EC_MSI_UDELAY); | |
227 | if (ec_transaction_done(ec)) | |
228 | return 0; | |
229 | } else { | |
230 | if (wait_event_timeout(ec->wait, | |
231 | ec_transaction_done(ec), | |
232 | msecs_to_jiffies(1))) | |
233 | return 0; | |
234 | } | |
235 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
236 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 237 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 238 | break; |
2a84cb98 AS |
239 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
240 | spin_lock_irqsave(&ec->curr_lock, flags); | |
241 | start_transaction(ec); | |
242 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 243 | } |
b77d81b2 | 244 | return -ETIME; |
1da177e4 LT |
245 | } |
246 | ||
8463200a | 247 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 248 | struct transaction *t) |
45bea155 | 249 | { |
7c6db4e0 | 250 | unsigned long tmp; |
7c6db4e0 | 251 | int ret = 0; |
3ebe08a7 | 252 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
253 | /* disable GPE during transaction if storm is detected */ |
254 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
0b7084ac | 255 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 256 | } |
5423a0cb | 257 | if (EC_FLAGS_MSI) |
2a84cb98 | 258 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 259 | /* start transaction */ |
8463200a | 260 | spin_lock_irqsave(&ec->curr_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); |
8463200a | 266 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 267 | ret = ec_poll(ec); |
3ebe08a7 | 268 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
269 | spin_lock_irqsave(&ec->curr_lock, tmp); |
270 | ec->curr = NULL; | |
271 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
272 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
273 | /* check if we received SCI during transaction */ | |
274 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
275 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 276 | acpi_enable_gpe(NULL, ec->gpe); |
2a84cb98 | 277 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
278 | pr_info(PREFIX "GPE storm detected, " |
279 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
280 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
281 | } | |
282 | return ret; | |
283 | } | |
284 | ||
285 | static int ec_check_ibf0(struct acpi_ec *ec) | |
286 | { | |
287 | u8 status = acpi_ec_read_status(ec); | |
288 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
289 | } |
290 | ||
c0ff1772 AS |
291 | static int ec_wait_ibf0(struct acpi_ec *ec) |
292 | { | |
293 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
294 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 295 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
296 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
297 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
298 | return 0; |
299 | return -ETIME; | |
45bea155 LY |
300 | } |
301 | ||
2a84cb98 | 302 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 303 | { |
d7a76e4c | 304 | int status; |
50526df6 | 305 | u32 glk; |
8463200a | 306 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 307 | return -EINVAL; |
8463200a AS |
308 | if (t->rdata) |
309 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 310 | mutex_lock(&ec->lock); |
703959d4 | 311 | if (ec->global_lock) { |
1da177e4 | 312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 313 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
314 | status = -ENODEV; |
315 | goto unlock; | |
c24e912b | 316 | } |
1da177e4 | 317 | } |
c0ff1772 | 318 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
319 | pr_err(PREFIX "input buffer is not empty, " |
320 | "aborting transaction\n"); | |
7c6db4e0 | 321 | status = -ETIME; |
451566f4 | 322 | goto end; |
716e084e | 323 | } |
2a84cb98 | 324 | status = acpi_ec_transaction_unlocked(ec, t); |
7c6db4e0 | 325 | end: |
703959d4 | 326 | if (ec->global_lock) |
1da177e4 | 327 | acpi_release_global_lock(glk); |
7c6db4e0 | 328 | unlock: |
523953b4 | 329 | mutex_unlock(&ec->lock); |
d550d98d | 330 | return status; |
1da177e4 LT |
331 | } |
332 | ||
8a383ef0 | 333 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
334 | { |
335 | u8 d; | |
8463200a AS |
336 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
337 | .wdata = NULL, .rdata = &d, | |
338 | .wlen = 0, .rlen = 1}; | |
339 | ||
2a84cb98 | 340 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
341 | } |
342 | ||
8a383ef0 | 343 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 344 | { |
8463200a AS |
345 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
346 | .wdata = NULL, .rdata = NULL, | |
347 | .wlen = 0, .rlen = 0}; | |
348 | ||
7c6db4e0 | 349 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 350 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
351 | } |
352 | ||
6ccedb10 | 353 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
354 | { |
355 | int result; | |
356 | u8 d; | |
8463200a AS |
357 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
358 | .wdata = &address, .rdata = &d, | |
359 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 360 | |
2a84cb98 | 361 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
362 | *data = d; |
363 | return result; | |
364 | } | |
6ffb221a | 365 | |
3576cf61 DS |
366 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
367 | { | |
6ccedb10 | 368 | u8 wdata[2] = { address, data }; |
8463200a AS |
369 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
370 | .wdata = wdata, .rdata = NULL, | |
371 | .wlen = 2, .rlen = 0}; | |
372 | ||
2a84cb98 | 373 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
374 | } |
375 | ||
1da177e4 LT |
376 | /* |
377 | * Externally callable EC access functions. For now, assume 1 EC only | |
378 | */ | |
c45aac43 AS |
379 | int ec_burst_enable(void) |
380 | { | |
c45aac43 AS |
381 | if (!first_ec) |
382 | return -ENODEV; | |
d033879c | 383 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
384 | } |
385 | ||
386 | EXPORT_SYMBOL(ec_burst_enable); | |
387 | ||
388 | int ec_burst_disable(void) | |
389 | { | |
c45aac43 AS |
390 | if (!first_ec) |
391 | return -ENODEV; | |
d033879c | 392 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
393 | } |
394 | ||
395 | EXPORT_SYMBOL(ec_burst_disable); | |
396 | ||
6ccedb10 | 397 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 398 | { |
1da177e4 | 399 | int err; |
6ffb221a | 400 | u8 temp_data; |
1da177e4 LT |
401 | |
402 | if (!first_ec) | |
403 | return -ENODEV; | |
404 | ||
d033879c | 405 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
406 | |
407 | if (!err) { | |
408 | *val = temp_data; | |
409 | return 0; | |
50526df6 | 410 | } else |
1da177e4 LT |
411 | return err; |
412 | } | |
50526df6 | 413 | |
1da177e4 LT |
414 | EXPORT_SYMBOL(ec_read); |
415 | ||
50526df6 | 416 | int ec_write(u8 addr, u8 val) |
1da177e4 | 417 | { |
1da177e4 LT |
418 | int err; |
419 | ||
420 | if (!first_ec) | |
421 | return -ENODEV; | |
422 | ||
d033879c | 423 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
424 | |
425 | return err; | |
426 | } | |
50526df6 | 427 | |
1da177e4 LT |
428 | EXPORT_SYMBOL(ec_write); |
429 | ||
616362de | 430 | int ec_transaction(u8 command, |
9e197219 | 431 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
432 | u8 * rdata, unsigned rdata_len, |
433 | int force_poll) | |
45bea155 | 434 | { |
8463200a AS |
435 | struct transaction t = {.command = command, |
436 | .wdata = wdata, .rdata = rdata, | |
437 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
438 | if (!first_ec) |
439 | return -ENODEV; | |
45bea155 | 440 | |
2a84cb98 | 441 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 442 | } |
1da177e4 | 443 | |
ab9e43c6 LP |
444 | EXPORT_SYMBOL(ec_transaction); |
445 | ||
6ccedb10 | 446 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
447 | { |
448 | int result; | |
6ccedb10 | 449 | u8 d; |
8463200a AS |
450 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
451 | .wdata = NULL, .rdata = &d, | |
452 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
453 | if (!ec || !data) |
454 | return -EINVAL; | |
1da177e4 | 455 | |
6ccedb10 AS |
456 | /* |
457 | * Query the EC to find out which _Qxx method we need to evaluate. | |
458 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
459 | * bit to be cleared (and thus clearing the interrupt source). | |
460 | */ | |
716e084e | 461 | |
2a84cb98 | 462 | result = acpi_ec_transaction(ec, &t); |
6ccedb10 AS |
463 | if (result) |
464 | return result; | |
1da177e4 | 465 | |
6ccedb10 AS |
466 | if (!d) |
467 | return -ENODATA; | |
1da177e4 | 468 | |
6ccedb10 AS |
469 | *data = d; |
470 | return 0; | |
1da177e4 LT |
471 | } |
472 | ||
1da177e4 LT |
473 | /* -------------------------------------------------------------------------- |
474 | Event Management | |
475 | -------------------------------------------------------------------------- */ | |
837012ed AS |
476 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
477 | acpi_handle handle, acpi_ec_query_func func, | |
478 | void *data) | |
479 | { | |
480 | struct acpi_ec_query_handler *handler = | |
481 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
482 | if (!handler) | |
483 | return -ENOMEM; | |
484 | ||
485 | handler->query_bit = query_bit; | |
486 | handler->handle = handle; | |
487 | handler->func = func; | |
488 | handler->data = data; | |
489 | mutex_lock(&ec->lock); | |
30c08574 | 490 | list_add(&handler->node, &ec->list); |
837012ed AS |
491 | mutex_unlock(&ec->lock); |
492 | return 0; | |
493 | } | |
494 | ||
495 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
496 | ||
497 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
498 | { | |
1544fdbc | 499 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 500 | mutex_lock(&ec->lock); |
1544fdbc | 501 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
502 | if (query_bit == handler->query_bit) { |
503 | list_del(&handler->node); | |
504 | kfree(handler); | |
837012ed AS |
505 | } |
506 | } | |
507 | mutex_unlock(&ec->lock); | |
508 | } | |
509 | ||
510 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 511 | |
50526df6 | 512 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 513 | { |
3d02b90b | 514 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 515 | u8 value = 0; |
837012ed | 516 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 517 | |
5d0c288b | 518 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 519 | return; |
837012ed AS |
520 | mutex_lock(&ec->lock); |
521 | list_for_each_entry(handler, &ec->list, node) { | |
522 | if (value == handler->query_bit) { | |
523 | /* have custom handler for this bit */ | |
524 | memcpy(©, handler, sizeof(copy)); | |
525 | mutex_unlock(&ec->lock); | |
526 | if (copy.func) { | |
527 | copy.func(copy.data); | |
528 | } else if (copy.handle) { | |
529 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
530 | } | |
531 | return; | |
532 | } | |
533 | } | |
534 | mutex_unlock(&ec->lock); | |
45bea155 | 535 | } |
1da177e4 | 536 | |
50526df6 | 537 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 538 | { |
3d02b90b | 539 | struct acpi_ec *ec = data; |
7c6db4e0 | 540 | u8 status; |
00eb43a1 | 541 | |
3ebe08a7 | 542 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
543 | status = acpi_ec_read_status(ec); |
544 | ||
2a84cb98 AS |
545 | advance_transaction(ec, status); |
546 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
547 | wake_up(&ec->wait); | |
7c6db4e0 | 548 | ec_check_sci(ec, status); |
7c6db4e0 | 549 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
550 | } |
551 | ||
1da177e4 LT |
552 | /* -------------------------------------------------------------------------- |
553 | Address Space Management | |
554 | -------------------------------------------------------------------------- */ | |
555 | ||
1da177e4 | 556 | static acpi_status |
5b7734b4 AS |
557 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
558 | u32 bits, acpi_integer *value, | |
50526df6 | 559 | void *handler_context, void *region_context) |
1da177e4 | 560 | { |
3d02b90b | 561 | struct acpi_ec *ec = handler_context; |
3e71a87d | 562 | int result = 0, i; |
5b7734b4 | 563 | u8 temp = 0; |
1da177e4 | 564 | |
1da177e4 | 565 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 566 | return AE_BAD_PARAMETER; |
1da177e4 | 567 | |
5b7734b4 | 568 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 569 | return AE_BAD_PARAMETER; |
1da177e4 | 570 | |
5b7734b4 AS |
571 | if (bits != 8 && acpi_strict) |
572 | return AE_BAD_PARAMETER; | |
1da177e4 | 573 | |
6a63b06f AS |
574 | if (EC_FLAGS_MSI) |
575 | acpi_ec_burst_enable(ec); | |
b3b233c7 | 576 | |
3e71a87d AS |
577 | if (function == ACPI_READ) { |
578 | result = acpi_ec_read(ec, address, &temp); | |
579 | *value = temp; | |
580 | } else { | |
581 | temp = 0xff & (*value); | |
582 | result = acpi_ec_write(ec, address, temp); | |
583 | } | |
584 | ||
585 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
586 | ++address; | |
5b7734b4 AS |
587 | if (function == ACPI_READ) { |
588 | result = acpi_ec_read(ec, address, &temp); | |
589 | (*value) |= ((acpi_integer)temp) << i; | |
590 | } else { | |
591 | temp = 0xff & ((*value) >> i); | |
592 | result = acpi_ec_write(ec, address, temp); | |
593 | } | |
1da177e4 LT |
594 | } |
595 | ||
6a63b06f AS |
596 | if (EC_FLAGS_MSI) |
597 | acpi_ec_burst_disable(ec); | |
b3b233c7 | 598 | |
1da177e4 LT |
599 | switch (result) { |
600 | case -EINVAL: | |
d550d98d | 601 | return AE_BAD_PARAMETER; |
1da177e4 LT |
602 | break; |
603 | case -ENODEV: | |
d550d98d | 604 | return AE_NOT_FOUND; |
1da177e4 LT |
605 | break; |
606 | case -ETIME: | |
d550d98d | 607 | return AE_TIME; |
1da177e4 LT |
608 | break; |
609 | default: | |
d550d98d | 610 | return AE_OK; |
1da177e4 | 611 | } |
1da177e4 LT |
612 | } |
613 | ||
1da177e4 LT |
614 | /* -------------------------------------------------------------------------- |
615 | FS Interface (/proc) | |
616 | -------------------------------------------------------------------------- */ | |
617 | ||
50526df6 | 618 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 619 | |
50526df6 | 620 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 621 | { |
3d02b90b | 622 | struct acpi_ec *ec = seq->private; |
1da177e4 | 623 | |
1da177e4 LT |
624 | if (!ec) |
625 | goto end; | |
626 | ||
01f22462 AS |
627 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
628 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
629 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
630 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 631 | ec->global_lock ? "yes" : "no"); |
50526df6 | 632 | end: |
d550d98d | 633 | return 0; |
1da177e4 LT |
634 | } |
635 | ||
636 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
637 | { | |
638 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
639 | } | |
640 | ||
070d8eb1 | 641 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
642 | .open = acpi_ec_info_open_fs, |
643 | .read = seq_read, | |
644 | .llseek = seq_lseek, | |
645 | .release = single_release, | |
1da177e4 LT |
646 | .owner = THIS_MODULE, |
647 | }; | |
648 | ||
50526df6 | 649 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 650 | { |
50526df6 | 651 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 652 | |
1da177e4 LT |
653 | if (!acpi_device_dir(device)) { |
654 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 655 | acpi_ec_dir); |
1da177e4 | 656 | if (!acpi_device_dir(device)) |
d550d98d | 657 | return -ENODEV; |
1da177e4 LT |
658 | } |
659 | ||
cf7acfab DL |
660 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
661 | acpi_device_dir(device), | |
662 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 663 | if (!entry) |
d550d98d | 664 | return -ENODEV; |
d550d98d | 665 | return 0; |
1da177e4 LT |
666 | } |
667 | ||
50526df6 | 668 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 669 | { |
1da177e4 LT |
670 | |
671 | if (acpi_device_dir(device)) { | |
672 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
673 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
674 | acpi_device_dir(device) = NULL; | |
675 | } | |
676 | ||
d550d98d | 677 | return 0; |
1da177e4 LT |
678 | } |
679 | ||
1da177e4 LT |
680 | /* -------------------------------------------------------------------------- |
681 | Driver Interface | |
682 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
683 | static acpi_status |
684 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
685 | ||
c0900c35 AS |
686 | static struct acpi_ec *make_acpi_ec(void) |
687 | { | |
688 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
689 | if (!ec) | |
690 | return NULL; | |
080e412c | 691 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
692 | mutex_init(&ec->lock); |
693 | init_waitqueue_head(&ec->wait); | |
837012ed | 694 | INIT_LIST_HEAD(&ec->list); |
8463200a | 695 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
696 | return ec; |
697 | } | |
837012ed | 698 | |
c019b193 AS |
699 | static acpi_status |
700 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
701 | void *context, void **return_value) | |
702 | { | |
0175d562 LM |
703 | char node_name[5]; |
704 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
705 | struct acpi_ec *ec = context; |
706 | int value = 0; | |
0175d562 LM |
707 | acpi_status status; |
708 | ||
709 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
710 | ||
711 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
712 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
713 | } | |
714 | return AE_OK; | |
715 | } | |
716 | ||
cd8c93a4 AS |
717 | static acpi_status |
718 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 719 | { |
cd8c93a4 | 720 | acpi_status status; |
d21cf3c1 | 721 | unsigned long long tmp = 0; |
cd8c93a4 AS |
722 | |
723 | struct acpi_ec *ec = context; | |
a5032bfd AS |
724 | |
725 | /* clear addr values, ec_parse_io_ports depend on it */ | |
726 | ec->command_addr = ec->data_addr = 0; | |
727 | ||
cd8c93a4 AS |
728 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
729 | ec_parse_io_ports, ec); | |
730 | if (ACPI_FAILURE(status)) | |
731 | return status; | |
837012ed AS |
732 | |
733 | /* Get GPE bit assignment (EC events). */ | |
734 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 735 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
736 | if (ACPI_FAILURE(status)) |
737 | return status; | |
27663c58 | 738 | ec->gpe = tmp; |
837012ed | 739 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 740 | tmp = 0; |
27663c58 MW |
741 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
742 | ec->global_lock = tmp; | |
837012ed | 743 | ec->handle = handle; |
cd8c93a4 | 744 | return AE_CTRL_TERMINATE; |
837012ed AS |
745 | } |
746 | ||
5efc5476 BH |
747 | static int ec_install_handlers(struct acpi_ec *ec) |
748 | { | |
749 | acpi_status status; | |
750 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
751 | return 0; | |
752 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
753 | ACPI_GPE_EDGE_TRIGGERED, | |
754 | &acpi_ec_gpe_handler, ec); | |
755 | if (ACPI_FAILURE(status)) | |
756 | return -ENODEV; | |
757 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
758 | acpi_enable_gpe(NULL, ec->gpe); | |
759 | status = acpi_install_address_space_handler(ec->handle, | |
760 | ACPI_ADR_SPACE_EC, | |
761 | &acpi_ec_space_handler, | |
762 | NULL, ec); | |
763 | if (ACPI_FAILURE(status)) { | |
764 | if (status == AE_NOT_FOUND) { | |
765 | /* | |
766 | * Maybe OS fails in evaluating the _REG object. | |
767 | * The AE_NOT_FOUND error will be ignored and OS | |
768 | * continue to initialize EC. | |
769 | */ | |
770 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
771 | " of EC device. Broken bios is suspected.\n"); | |
772 | } else { | |
773 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
774 | &acpi_ec_gpe_handler); | |
775 | return -ENODEV; | |
776 | } | |
777 | } | |
778 | ||
779 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
780 | return 0; | |
781 | } | |
782 | ||
4c611060 AS |
783 | static void ec_remove_handlers(struct acpi_ec *ec) |
784 | { | |
785 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
786 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 787 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
788 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
789 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 790 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 791 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
792 | } |
793 | ||
703959d4 | 794 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 795 | { |
703959d4 | 796 | struct acpi_ec *ec = NULL; |
d02be047 | 797 | int ret; |
45bea155 | 798 | |
c0900c35 AS |
799 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
800 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
801 | ||
4c611060 | 802 | /* Check for boot EC */ |
ce52ddf5 AS |
803 | if (boot_ec && |
804 | (boot_ec->handle == device->handle || | |
805 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
806 | ec = boot_ec; | |
807 | boot_ec = NULL; | |
808 | } else { | |
809 | ec = make_acpi_ec(); | |
810 | if (!ec) | |
811 | return -ENOMEM; | |
a5032bfd AS |
812 | } |
813 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
814 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
815 | kfree(ec); |
816 | return -EINVAL; | |
4c611060 AS |
817 | } |
818 | ||
c0900c35 | 819 | ec->handle = device->handle; |
ce52ddf5 AS |
820 | |
821 | /* Find and register all query methods */ | |
822 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
823 | acpi_ec_register_query_methods, ec, NULL); | |
824 | ||
4c611060 AS |
825 | if (!first_ec) |
826 | first_ec = ec; | |
db89b4f0 | 827 | device->driver_data = ec; |
c0900c35 | 828 | acpi_ec_add_fs(device); |
3ebe08a7 | 829 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 830 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
831 | |
832 | ret = ec_install_handlers(ec); | |
833 | ||
834 | /* EC is fully operational, allow queries */ | |
835 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
836 | return ret; | |
1da177e4 LT |
837 | } |
838 | ||
50526df6 | 839 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 840 | { |
01f22462 | 841 | struct acpi_ec *ec; |
07ddf768 | 842 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 843 | |
1da177e4 | 844 | if (!device) |
d550d98d | 845 | return -EINVAL; |
1da177e4 LT |
846 | |
847 | ec = acpi_driver_data(device); | |
cf745ec7 | 848 | ec_remove_handlers(ec); |
837012ed | 849 | mutex_lock(&ec->lock); |
07ddf768 | 850 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
851 | list_del(&handler->node); |
852 | kfree(handler); | |
853 | } | |
854 | mutex_unlock(&ec->lock); | |
1da177e4 | 855 | acpi_ec_remove_fs(device); |
db89b4f0 | 856 | device->driver_data = NULL; |
d033879c | 857 | if (ec == first_ec) |
c0900c35 | 858 | first_ec = NULL; |
4c611060 | 859 | kfree(ec); |
d550d98d | 860 | return 0; |
1da177e4 LT |
861 | } |
862 | ||
1da177e4 | 863 | static acpi_status |
c0900c35 | 864 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 865 | { |
3d02b90b | 866 | struct acpi_ec *ec = context; |
1da177e4 | 867 | |
01f22462 | 868 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 869 | return AE_OK; |
1da177e4 LT |
870 | |
871 | /* | |
872 | * The first address region returned is the data port, and | |
873 | * the second address region returned is the status/command | |
874 | * port. | |
875 | */ | |
01f22462 | 876 | if (ec->data_addr == 0) |
6ffb221a | 877 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 878 | else if (ec->command_addr == 0) |
6ffb221a | 879 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 880 | else |
1da177e4 | 881 | return AE_CTRL_TERMINATE; |
1da177e4 | 882 | |
1da177e4 LT |
883 | return AE_OK; |
884 | } | |
885 | ||
c04209a7 AS |
886 | int __init acpi_boot_ec_enable(void) |
887 | { | |
7c6db4e0 | 888 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
889 | return 0; |
890 | if (!ec_install_handlers(boot_ec)) { | |
891 | first_ec = boot_ec; | |
892 | return 0; | |
893 | } | |
894 | return -EFAULT; | |
895 | } | |
896 | ||
223883b7 AS |
897 | static const struct acpi_device_id ec_device_ids[] = { |
898 | {"PNP0C09", 0}, | |
899 | {"", 0}, | |
900 | }; | |
901 | ||
478fa03b AS |
902 | /* Some BIOS do not survive early DSDT scan, skip it */ |
903 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
904 | { | |
905 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
906 | return 0; | |
907 | } | |
908 | ||
0adf3c74 AS |
909 | /* ASUStek often supplies us with broken ECDT, validate it */ |
910 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
911 | { | |
912 | EC_FLAGS_VALIDATE_ECDT = 1; | |
913 | return 0; | |
914 | } | |
915 | ||
916 | /* MSI EC needs special treatment, enable it */ | |
917 | static int ec_flag_msi(const struct dmi_system_id *id) | |
918 | { | |
919 | EC_FLAGS_MSI = 1; | |
920 | EC_FLAGS_VALIDATE_ECDT = 1; | |
921 | return 0; | |
922 | } | |
923 | ||
924 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
925 | { |
926 | ec_skip_dsdt_scan, "Compal JFL92", { | |
927 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
928 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
929 | { |
930 | ec_flag_msi, "MSI hardware", { | |
931 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star"), | |
932 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star") }, NULL}, | |
933 | { | |
934 | ec_validate_ecdt, "ASUS hardware", { | |
935 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
936 | {}, | |
937 | }; | |
938 | ||
939 | ||
c0900c35 AS |
940 | int __init acpi_ec_ecdt_probe(void) |
941 | { | |
c0900c35 | 942 | acpi_status status; |
c6cb0e87 | 943 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 944 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 945 | |
d66d969d AS |
946 | boot_ec = make_acpi_ec(); |
947 | if (!boot_ec) | |
c0900c35 AS |
948 | return -ENOMEM; |
949 | /* | |
950 | * Generate a boot ec context | |
951 | */ | |
0adf3c74 | 952 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
953 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
954 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 955 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 956 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
957 | boot_ec->command_addr = ecdt_ptr->control.address; |
958 | boot_ec->data_addr = ecdt_ptr->data.address; | |
959 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 960 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 961 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 962 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 963 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 964 | goto install; |
c6cb0e87 AS |
965 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
966 | if (!saved_ec) | |
967 | return -ENOMEM; | |
a5032bfd | 968 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 969 | /* fall through */ |
cd8c93a4 | 970 | } |
0adf3c74 | 971 | |
478fa03b AS |
972 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
973 | return -ENODEV; | |
974 | ||
c5279dee AS |
975 | /* This workaround is needed only on some broken machines, |
976 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
977 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
978 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
979 | boot_ec, NULL); | |
980 | /* Check that acpi_get_devices actually find something */ | |
981 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
982 | goto error; | |
c6cb0e87 AS |
983 | if (saved_ec) { |
984 | /* try to find good ECDT from ASUSTek */ | |
985 | if (saved_ec->command_addr != boot_ec->command_addr || | |
986 | saved_ec->data_addr != boot_ec->data_addr || | |
987 | saved_ec->gpe != boot_ec->gpe || | |
988 | saved_ec->handle != boot_ec->handle) | |
989 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
990 | "ECDT tables, which are very hard to workaround. " | |
991 | "Trying to use DSDT EC info instead. Please send " | |
992 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
993 | kfree(saved_ec); | |
994 | saved_ec = NULL; | |
995 | } else { | |
996 | /* We really need to limit this workaround, the only ASUS, | |
997 | * which needs it, has fake EC._INI method, so use it as flag. | |
998 | * Keep boot_ec struct as it will be needed soon. | |
999 | */ | |
1000 | acpi_handle dummy; | |
1001 | if (!dmi_name_in_vendors("ASUS") || | |
1002 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1003 | &dummy))) | |
1004 | return -ENODEV; | |
1005 | } | |
c5279dee AS |
1006 | install: |
1007 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1008 | first_ec = boot_ec; |
e8284321 | 1009 | return 0; |
d033879c | 1010 | } |
c5279dee | 1011 | error: |
d66d969d AS |
1012 | kfree(boot_ec); |
1013 | boot_ec = NULL; | |
1da177e4 LT |
1014 | return -ENODEV; |
1015 | } | |
1016 | ||
223883b7 AS |
1017 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1018 | { | |
1019 | struct acpi_ec *ec = acpi_driver_data(device); | |
1020 | /* Stop using GPE */ | |
0b7084ac | 1021 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | static int acpi_ec_resume(struct acpi_device *device) | |
1026 | { | |
1027 | struct acpi_ec *ec = acpi_driver_data(device); | |
1028 | /* Enable use of GPE back */ | |
0b7084ac | 1029 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1030 | return 0; |
1031 | } | |
1032 | ||
1033 | static struct acpi_driver acpi_ec_driver = { | |
1034 | .name = "ec", | |
1035 | .class = ACPI_EC_CLASS, | |
1036 | .ids = ec_device_ids, | |
1037 | .ops = { | |
1038 | .add = acpi_ec_add, | |
1039 | .remove = acpi_ec_remove, | |
223883b7 AS |
1040 | .suspend = acpi_ec_suspend, |
1041 | .resume = acpi_ec_resume, | |
1042 | }, | |
1043 | }; | |
1044 | ||
a5f820fe | 1045 | int __init acpi_ec_init(void) |
1da177e4 | 1046 | { |
50526df6 | 1047 | int result = 0; |
1da177e4 | 1048 | |
1da177e4 LT |
1049 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1050 | if (!acpi_ec_dir) | |
d550d98d | 1051 | return -ENODEV; |
1da177e4 LT |
1052 | |
1053 | /* Now register the driver for the EC */ | |
1054 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1055 | if (result < 0) { | |
1056 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1057 | return -ENODEV; |
1da177e4 LT |
1058 | } |
1059 | ||
d550d98d | 1060 | return result; |
1da177e4 LT |
1061 | } |
1062 | ||
1da177e4 LT |
1063 | /* EC driver currently not unloadable */ |
1064 | #if 0 | |
50526df6 | 1065 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1066 | { |
1da177e4 LT |
1067 | |
1068 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1069 | ||
1070 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1071 | ||
d550d98d | 1072 | return; |
1da177e4 | 1073 | } |
7843932a | 1074 | #endif /* 0 */ |