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 */ |
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 | |
a62e8f19 | 204 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 205 | |
a62e8f19 | 206 | static int ec_check_sci_sync(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)) | |
a62e8f19 | 210 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
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)); | |
e12ac3d0 | 236 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 237 | break; |
2a84cb98 AS |
238 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
239 | spin_lock_irqsave(&ec->curr_lock, flags); | |
240 | start_transaction(ec); | |
241 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 242 | } |
b77d81b2 | 243 | return -ETIME; |
1da177e4 LT |
244 | } |
245 | ||
8463200a | 246 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 247 | struct transaction *t) |
45bea155 | 248 | { |
7c6db4e0 | 249 | unsigned long tmp; |
7c6db4e0 | 250 | int ret = 0; |
5423a0cb | 251 | if (EC_FLAGS_MSI) |
2a84cb98 | 252 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 253 | /* start transaction */ |
8463200a | 254 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 255 | /* following two actions should be kept atomic */ |
8463200a | 256 | ec->curr = t; |
a2f93aea | 257 | start_transaction(ec); |
8463200a | 258 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 259 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 260 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 261 | ret = ec_poll(ec); |
8463200a AS |
262 | spin_lock_irqsave(&ec->curr_lock, tmp); |
263 | ec->curr = NULL; | |
264 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
265 | return ret; |
266 | } | |
267 | ||
268 | static int ec_check_ibf0(struct acpi_ec *ec) | |
269 | { | |
270 | u8 status = acpi_ec_read_status(ec); | |
271 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
272 | } |
273 | ||
c0ff1772 AS |
274 | static int ec_wait_ibf0(struct acpi_ec *ec) |
275 | { | |
276 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
277 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 278 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
279 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
280 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
281 | return 0; |
282 | return -ETIME; | |
45bea155 LY |
283 | } |
284 | ||
2a84cb98 | 285 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 286 | { |
d7a76e4c | 287 | int status; |
50526df6 | 288 | u32 glk; |
8463200a | 289 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 290 | return -EINVAL; |
8463200a AS |
291 | if (t->rdata) |
292 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 293 | mutex_lock(&ec->lock); |
703959d4 | 294 | if (ec->global_lock) { |
1da177e4 | 295 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 296 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
297 | status = -ENODEV; |
298 | goto unlock; | |
c24e912b | 299 | } |
1da177e4 | 300 | } |
c0ff1772 | 301 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
302 | pr_err(PREFIX "input buffer is not empty, " |
303 | "aborting transaction\n"); | |
7c6db4e0 | 304 | status = -ETIME; |
451566f4 | 305 | goto end; |
716e084e | 306 | } |
a62e8f19 AS |
307 | pr_debug(PREFIX "transaction start\n"); |
308 | /* disable GPE during transaction if storm is detected */ | |
309 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
310 | acpi_disable_gpe(NULL, ec->gpe); | |
311 | } | |
312 | ||
2a84cb98 | 313 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
314 | |
315 | /* check if we received SCI during transaction */ | |
316 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
317 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 318 | msleep(1); |
a62e8f19 AS |
319 | /* it is safe to enable GPE outside of transaction */ |
320 | acpi_enable_gpe(NULL, ec->gpe); | |
321 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { | |
322 | pr_info(PREFIX "GPE storm detected, " | |
323 | "transactions will use polling mode\n"); | |
324 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
325 | } | |
54070101 | 326 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 327 | end: |
703959d4 | 328 | if (ec->global_lock) |
1da177e4 | 329 | acpi_release_global_lock(glk); |
7c6db4e0 | 330 | unlock: |
523953b4 | 331 | mutex_unlock(&ec->lock); |
d550d98d | 332 | return status; |
1da177e4 LT |
333 | } |
334 | ||
8a383ef0 | 335 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
336 | { |
337 | u8 d; | |
8463200a AS |
338 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
339 | .wdata = NULL, .rdata = &d, | |
340 | .wlen = 0, .rlen = 1}; | |
341 | ||
2a84cb98 | 342 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
343 | } |
344 | ||
8a383ef0 | 345 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 346 | { |
8463200a AS |
347 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
348 | .wdata = NULL, .rdata = NULL, | |
349 | .wlen = 0, .rlen = 0}; | |
350 | ||
7c6db4e0 | 351 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 352 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
353 | } |
354 | ||
6ccedb10 | 355 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
356 | { |
357 | int result; | |
358 | u8 d; | |
8463200a AS |
359 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
360 | .wdata = &address, .rdata = &d, | |
361 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 362 | |
2a84cb98 | 363 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
364 | *data = d; |
365 | return result; | |
366 | } | |
6ffb221a | 367 | |
3576cf61 DS |
368 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
369 | { | |
6ccedb10 | 370 | u8 wdata[2] = { address, data }; |
8463200a AS |
371 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
372 | .wdata = wdata, .rdata = NULL, | |
373 | .wlen = 2, .rlen = 0}; | |
374 | ||
2a84cb98 | 375 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
376 | } |
377 | ||
1da177e4 LT |
378 | /* |
379 | * Externally callable EC access functions. For now, assume 1 EC only | |
380 | */ | |
c45aac43 AS |
381 | int ec_burst_enable(void) |
382 | { | |
c45aac43 AS |
383 | if (!first_ec) |
384 | return -ENODEV; | |
d033879c | 385 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
386 | } |
387 | ||
388 | EXPORT_SYMBOL(ec_burst_enable); | |
389 | ||
390 | int ec_burst_disable(void) | |
391 | { | |
c45aac43 AS |
392 | if (!first_ec) |
393 | return -ENODEV; | |
d033879c | 394 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
395 | } |
396 | ||
397 | EXPORT_SYMBOL(ec_burst_disable); | |
398 | ||
6ccedb10 | 399 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 400 | { |
1da177e4 | 401 | int err; |
6ffb221a | 402 | u8 temp_data; |
1da177e4 LT |
403 | |
404 | if (!first_ec) | |
405 | return -ENODEV; | |
406 | ||
d033879c | 407 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
408 | |
409 | if (!err) { | |
410 | *val = temp_data; | |
411 | return 0; | |
50526df6 | 412 | } else |
1da177e4 LT |
413 | return err; |
414 | } | |
50526df6 | 415 | |
1da177e4 LT |
416 | EXPORT_SYMBOL(ec_read); |
417 | ||
50526df6 | 418 | int ec_write(u8 addr, u8 val) |
1da177e4 | 419 | { |
1da177e4 LT |
420 | int err; |
421 | ||
422 | if (!first_ec) | |
423 | return -ENODEV; | |
424 | ||
d033879c | 425 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
426 | |
427 | return err; | |
428 | } | |
50526df6 | 429 | |
1da177e4 LT |
430 | EXPORT_SYMBOL(ec_write); |
431 | ||
616362de | 432 | int ec_transaction(u8 command, |
9e197219 | 433 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
434 | u8 * rdata, unsigned rdata_len, |
435 | int force_poll) | |
45bea155 | 436 | { |
8463200a AS |
437 | struct transaction t = {.command = command, |
438 | .wdata = wdata, .rdata = rdata, | |
439 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
440 | if (!first_ec) |
441 | return -ENODEV; | |
45bea155 | 442 | |
2a84cb98 | 443 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 444 | } |
1da177e4 | 445 | |
ab9e43c6 LP |
446 | EXPORT_SYMBOL(ec_transaction); |
447 | ||
a62e8f19 | 448 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
449 | { |
450 | int result; | |
6ccedb10 | 451 | u8 d; |
8463200a AS |
452 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
453 | .wdata = NULL, .rdata = &d, | |
454 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
455 | if (!ec || !data) |
456 | return -EINVAL; | |
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 | */ | |
a62e8f19 | 462 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
463 | if (result) |
464 | return result; | |
6ccedb10 AS |
465 | if (!d) |
466 | return -ENODATA; | |
6ccedb10 AS |
467 | *data = d; |
468 | return 0; | |
1da177e4 LT |
469 | } |
470 | ||
1da177e4 LT |
471 | /* -------------------------------------------------------------------------- |
472 | Event Management | |
473 | -------------------------------------------------------------------------- */ | |
837012ed AS |
474 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
475 | acpi_handle handle, acpi_ec_query_func func, | |
476 | void *data) | |
477 | { | |
478 | struct acpi_ec_query_handler *handler = | |
479 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
480 | if (!handler) | |
481 | return -ENOMEM; | |
482 | ||
483 | handler->query_bit = query_bit; | |
484 | handler->handle = handle; | |
485 | handler->func = func; | |
486 | handler->data = data; | |
487 | mutex_lock(&ec->lock); | |
30c08574 | 488 | list_add(&handler->node, &ec->list); |
837012ed AS |
489 | mutex_unlock(&ec->lock); |
490 | return 0; | |
491 | } | |
492 | ||
493 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
494 | ||
495 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
496 | { | |
1544fdbc | 497 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 498 | mutex_lock(&ec->lock); |
1544fdbc | 499 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
500 | if (query_bit == handler->query_bit) { |
501 | list_del(&handler->node); | |
502 | kfree(handler); | |
837012ed AS |
503 | } |
504 | } | |
505 | mutex_unlock(&ec->lock); | |
506 | } | |
507 | ||
508 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 509 | |
a62e8f19 | 510 | static void acpi_ec_run(void *cxt) |
45bea155 | 511 | { |
a62e8f19 AS |
512 | struct acpi_ec_query_handler *handler = cxt; |
513 | if (!handler) | |
e41334c0 | 514 | return; |
a62e8f19 AS |
515 | pr_debug(PREFIX "start query execution\n"); |
516 | if (handler->func) | |
517 | handler->func(handler->data); | |
518 | else if (handler->handle) | |
519 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
520 | pr_debug(PREFIX "stop query execution\n"); | |
521 | kfree(handler); | |
522 | } | |
523 | ||
524 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
525 | { | |
526 | u8 value = 0; | |
527 | int status; | |
528 | struct acpi_ec_query_handler *handler, *copy; | |
529 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
530 | return status; | |
837012ed AS |
531 | list_for_each_entry(handler, &ec->list, node) { |
532 | if (value == handler->query_bit) { | |
533 | /* have custom handler for this bit */ | |
a62e8f19 AS |
534 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
535 | if (!copy) | |
536 | return -ENOMEM; | |
537 | memcpy(copy, handler, sizeof(*copy)); | |
538 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
539 | return acpi_os_execute((copy->func) ? |
540 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 541 | acpi_ec_run, copy); |
837012ed AS |
542 | } |
543 | } | |
a62e8f19 AS |
544 | return 0; |
545 | } | |
546 | ||
547 | static void acpi_ec_gpe_query(void *ec_cxt) | |
548 | { | |
549 | struct acpi_ec *ec = ec_cxt; | |
550 | if (!ec) | |
551 | return; | |
552 | mutex_lock(&ec->lock); | |
553 | acpi_ec_sync_query(ec); | |
837012ed | 554 | mutex_unlock(&ec->lock); |
45bea155 | 555 | } |
1da177e4 | 556 | |
a62e8f19 AS |
557 | static void acpi_ec_gpe_query(void *ec_cxt); |
558 | ||
559 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
560 | { | |
561 | if (state & ACPI_EC_FLAG_SCI) { | |
562 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
563 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
564 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
565 | acpi_ec_gpe_query, ec); | |
566 | } | |
567 | } | |
568 | return 0; | |
569 | } | |
570 | ||
50526df6 | 571 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 572 | { |
3d02b90b | 573 | struct acpi_ec *ec = data; |
00eb43a1 | 574 | |
3ebe08a7 | 575 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 576 | |
a62e8f19 AS |
577 | advance_transaction(ec, acpi_ec_read_status(ec)); |
578 | if (ec_transaction_done(ec) && | |
579 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 580 | wake_up(&ec->wait); |
a62e8f19 AS |
581 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
582 | } | |
7c6db4e0 | 583 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
584 | } |
585 | ||
1da177e4 LT |
586 | /* -------------------------------------------------------------------------- |
587 | Address Space Management | |
588 | -------------------------------------------------------------------------- */ | |
589 | ||
1da177e4 | 590 | static acpi_status |
5b7734b4 AS |
591 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
592 | u32 bits, acpi_integer *value, | |
50526df6 | 593 | void *handler_context, void *region_context) |
1da177e4 | 594 | { |
3d02b90b | 595 | struct acpi_ec *ec = handler_context; |
3e71a87d | 596 | int result = 0, i; |
5b7734b4 | 597 | u8 temp = 0; |
1da177e4 | 598 | |
1da177e4 | 599 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 600 | return AE_BAD_PARAMETER; |
1da177e4 | 601 | |
5b7734b4 | 602 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 603 | return AE_BAD_PARAMETER; |
1da177e4 | 604 | |
5b7734b4 AS |
605 | if (bits != 8 && acpi_strict) |
606 | return AE_BAD_PARAMETER; | |
1da177e4 | 607 | |
6a63b06f AS |
608 | if (EC_FLAGS_MSI) |
609 | acpi_ec_burst_enable(ec); | |
b3b233c7 | 610 | |
3e71a87d AS |
611 | if (function == ACPI_READ) { |
612 | result = acpi_ec_read(ec, address, &temp); | |
613 | *value = temp; | |
614 | } else { | |
615 | temp = 0xff & (*value); | |
616 | result = acpi_ec_write(ec, address, temp); | |
617 | } | |
618 | ||
619 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
620 | ++address; | |
5b7734b4 AS |
621 | if (function == ACPI_READ) { |
622 | result = acpi_ec_read(ec, address, &temp); | |
623 | (*value) |= ((acpi_integer)temp) << i; | |
624 | } else { | |
625 | temp = 0xff & ((*value) >> i); | |
626 | result = acpi_ec_write(ec, address, temp); | |
627 | } | |
1da177e4 LT |
628 | } |
629 | ||
6a63b06f AS |
630 | if (EC_FLAGS_MSI) |
631 | acpi_ec_burst_disable(ec); | |
b3b233c7 | 632 | |
1da177e4 LT |
633 | switch (result) { |
634 | case -EINVAL: | |
d550d98d | 635 | return AE_BAD_PARAMETER; |
1da177e4 LT |
636 | break; |
637 | case -ENODEV: | |
d550d98d | 638 | return AE_NOT_FOUND; |
1da177e4 LT |
639 | break; |
640 | case -ETIME: | |
d550d98d | 641 | return AE_TIME; |
1da177e4 LT |
642 | break; |
643 | default: | |
d550d98d | 644 | return AE_OK; |
1da177e4 | 645 | } |
1da177e4 LT |
646 | } |
647 | ||
1da177e4 LT |
648 | /* -------------------------------------------------------------------------- |
649 | FS Interface (/proc) | |
650 | -------------------------------------------------------------------------- */ | |
651 | ||
50526df6 | 652 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 653 | |
50526df6 | 654 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 655 | { |
3d02b90b | 656 | struct acpi_ec *ec = seq->private; |
1da177e4 | 657 | |
1da177e4 LT |
658 | if (!ec) |
659 | goto end; | |
660 | ||
01f22462 AS |
661 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
662 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
663 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
664 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 665 | ec->global_lock ? "yes" : "no"); |
50526df6 | 666 | end: |
d550d98d | 667 | return 0; |
1da177e4 LT |
668 | } |
669 | ||
670 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
671 | { | |
672 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
673 | } | |
674 | ||
070d8eb1 | 675 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
676 | .open = acpi_ec_info_open_fs, |
677 | .read = seq_read, | |
678 | .llseek = seq_lseek, | |
679 | .release = single_release, | |
1da177e4 LT |
680 | .owner = THIS_MODULE, |
681 | }; | |
682 | ||
50526df6 | 683 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 684 | { |
50526df6 | 685 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 686 | |
1da177e4 LT |
687 | if (!acpi_device_dir(device)) { |
688 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 689 | acpi_ec_dir); |
1da177e4 | 690 | if (!acpi_device_dir(device)) |
d550d98d | 691 | return -ENODEV; |
1da177e4 LT |
692 | } |
693 | ||
cf7acfab DL |
694 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
695 | acpi_device_dir(device), | |
696 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 697 | if (!entry) |
d550d98d | 698 | return -ENODEV; |
d550d98d | 699 | return 0; |
1da177e4 LT |
700 | } |
701 | ||
50526df6 | 702 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 703 | { |
1da177e4 LT |
704 | |
705 | if (acpi_device_dir(device)) { | |
706 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
707 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
708 | acpi_device_dir(device) = NULL; | |
709 | } | |
710 | ||
d550d98d | 711 | return 0; |
1da177e4 LT |
712 | } |
713 | ||
1da177e4 LT |
714 | /* -------------------------------------------------------------------------- |
715 | Driver Interface | |
716 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
717 | static acpi_status |
718 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
719 | ||
c0900c35 AS |
720 | static struct acpi_ec *make_acpi_ec(void) |
721 | { | |
722 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
723 | if (!ec) | |
724 | return NULL; | |
080e412c | 725 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
726 | mutex_init(&ec->lock); |
727 | init_waitqueue_head(&ec->wait); | |
837012ed | 728 | INIT_LIST_HEAD(&ec->list); |
8463200a | 729 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
730 | return ec; |
731 | } | |
837012ed | 732 | |
c019b193 AS |
733 | static acpi_status |
734 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
735 | void *context, void **return_value) | |
736 | { | |
0175d562 LM |
737 | char node_name[5]; |
738 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
739 | struct acpi_ec *ec = context; |
740 | int value = 0; | |
0175d562 LM |
741 | acpi_status status; |
742 | ||
743 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
744 | ||
745 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
746 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
747 | } | |
748 | return AE_OK; | |
749 | } | |
750 | ||
cd8c93a4 AS |
751 | static acpi_status |
752 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 753 | { |
cd8c93a4 | 754 | acpi_status status; |
d21cf3c1 | 755 | unsigned long long tmp = 0; |
cd8c93a4 AS |
756 | |
757 | struct acpi_ec *ec = context; | |
a5032bfd AS |
758 | |
759 | /* clear addr values, ec_parse_io_ports depend on it */ | |
760 | ec->command_addr = ec->data_addr = 0; | |
761 | ||
cd8c93a4 AS |
762 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
763 | ec_parse_io_ports, ec); | |
764 | if (ACPI_FAILURE(status)) | |
765 | return status; | |
837012ed AS |
766 | |
767 | /* Get GPE bit assignment (EC events). */ | |
768 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 769 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
770 | if (ACPI_FAILURE(status)) |
771 | return status; | |
27663c58 | 772 | ec->gpe = tmp; |
837012ed | 773 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 774 | tmp = 0; |
27663c58 MW |
775 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
776 | ec->global_lock = tmp; | |
837012ed | 777 | ec->handle = handle; |
cd8c93a4 | 778 | return AE_CTRL_TERMINATE; |
837012ed AS |
779 | } |
780 | ||
5efc5476 BH |
781 | static int ec_install_handlers(struct acpi_ec *ec) |
782 | { | |
783 | acpi_status status; | |
784 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
785 | return 0; | |
786 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
787 | ACPI_GPE_EDGE_TRIGGERED, | |
788 | &acpi_ec_gpe_handler, ec); | |
789 | if (ACPI_FAILURE(status)) | |
790 | return -ENODEV; | |
791 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
792 | acpi_enable_gpe(NULL, ec->gpe); | |
793 | status = acpi_install_address_space_handler(ec->handle, | |
794 | ACPI_ADR_SPACE_EC, | |
795 | &acpi_ec_space_handler, | |
796 | NULL, ec); | |
797 | if (ACPI_FAILURE(status)) { | |
798 | if (status == AE_NOT_FOUND) { | |
799 | /* | |
800 | * Maybe OS fails in evaluating the _REG object. | |
801 | * The AE_NOT_FOUND error will be ignored and OS | |
802 | * continue to initialize EC. | |
803 | */ | |
804 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
805 | " of EC device. Broken bios is suspected.\n"); | |
806 | } else { | |
807 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
808 | &acpi_ec_gpe_handler); | |
809 | return -ENODEV; | |
810 | } | |
811 | } | |
812 | ||
813 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
814 | return 0; | |
815 | } | |
816 | ||
4c611060 AS |
817 | static void ec_remove_handlers(struct acpi_ec *ec) |
818 | { | |
819 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
820 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 821 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
822 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
823 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 824 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 825 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
826 | } |
827 | ||
703959d4 | 828 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 829 | { |
703959d4 | 830 | struct acpi_ec *ec = NULL; |
d02be047 | 831 | int ret; |
45bea155 | 832 | |
c0900c35 AS |
833 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
834 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
835 | ||
4c611060 | 836 | /* Check for boot EC */ |
ce52ddf5 AS |
837 | if (boot_ec && |
838 | (boot_ec->handle == device->handle || | |
839 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
840 | ec = boot_ec; | |
841 | boot_ec = NULL; | |
842 | } else { | |
843 | ec = make_acpi_ec(); | |
844 | if (!ec) | |
845 | return -ENOMEM; | |
a5032bfd AS |
846 | } |
847 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
848 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
849 | kfree(ec); |
850 | return -EINVAL; | |
4c611060 AS |
851 | } |
852 | ||
c0900c35 | 853 | ec->handle = device->handle; |
ce52ddf5 AS |
854 | |
855 | /* Find and register all query methods */ | |
856 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 857 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 858 | |
4c611060 AS |
859 | if (!first_ec) |
860 | first_ec = ec; | |
db89b4f0 | 861 | device->driver_data = ec; |
c0900c35 | 862 | acpi_ec_add_fs(device); |
3ebe08a7 | 863 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 864 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
865 | |
866 | ret = ec_install_handlers(ec); | |
867 | ||
868 | /* EC is fully operational, allow queries */ | |
869 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
870 | return ret; | |
1da177e4 LT |
871 | } |
872 | ||
50526df6 | 873 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 874 | { |
01f22462 | 875 | struct acpi_ec *ec; |
07ddf768 | 876 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 877 | |
1da177e4 | 878 | if (!device) |
d550d98d | 879 | return -EINVAL; |
1da177e4 LT |
880 | |
881 | ec = acpi_driver_data(device); | |
cf745ec7 | 882 | ec_remove_handlers(ec); |
837012ed | 883 | mutex_lock(&ec->lock); |
07ddf768 | 884 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
885 | list_del(&handler->node); |
886 | kfree(handler); | |
887 | } | |
888 | mutex_unlock(&ec->lock); | |
1da177e4 | 889 | acpi_ec_remove_fs(device); |
db89b4f0 | 890 | device->driver_data = NULL; |
d033879c | 891 | if (ec == first_ec) |
c0900c35 | 892 | first_ec = NULL; |
4c611060 | 893 | kfree(ec); |
d550d98d | 894 | return 0; |
1da177e4 LT |
895 | } |
896 | ||
1da177e4 | 897 | static acpi_status |
c0900c35 | 898 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 899 | { |
3d02b90b | 900 | struct acpi_ec *ec = context; |
1da177e4 | 901 | |
01f22462 | 902 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 903 | return AE_OK; |
1da177e4 LT |
904 | |
905 | /* | |
906 | * The first address region returned is the data port, and | |
907 | * the second address region returned is the status/command | |
908 | * port. | |
909 | */ | |
01f22462 | 910 | if (ec->data_addr == 0) |
6ffb221a | 911 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 912 | else if (ec->command_addr == 0) |
6ffb221a | 913 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 914 | else |
1da177e4 | 915 | return AE_CTRL_TERMINATE; |
1da177e4 | 916 | |
1da177e4 LT |
917 | return AE_OK; |
918 | } | |
919 | ||
c04209a7 AS |
920 | int __init acpi_boot_ec_enable(void) |
921 | { | |
7c6db4e0 | 922 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
923 | return 0; |
924 | if (!ec_install_handlers(boot_ec)) { | |
925 | first_ec = boot_ec; | |
926 | return 0; | |
927 | } | |
928 | return -EFAULT; | |
929 | } | |
930 | ||
223883b7 AS |
931 | static const struct acpi_device_id ec_device_ids[] = { |
932 | {"PNP0C09", 0}, | |
933 | {"", 0}, | |
934 | }; | |
935 | ||
478fa03b AS |
936 | /* Some BIOS do not survive early DSDT scan, skip it */ |
937 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
938 | { | |
939 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
940 | return 0; | |
941 | } | |
942 | ||
0adf3c74 AS |
943 | /* ASUStek often supplies us with broken ECDT, validate it */ |
944 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
945 | { | |
946 | EC_FLAGS_VALIDATE_ECDT = 1; | |
947 | return 0; | |
948 | } | |
949 | ||
950 | /* MSI EC needs special treatment, enable it */ | |
951 | static int ec_flag_msi(const struct dmi_system_id *id) | |
952 | { | |
55b313f2 | 953 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
954 | EC_FLAGS_MSI = 1; |
955 | EC_FLAGS_VALIDATE_ECDT = 1; | |
956 | return 0; | |
957 | } | |
958 | ||
959 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
960 | { |
961 | ec_skip_dsdt_scan, "Compal JFL92", { | |
962 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
963 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
964 | { |
965 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
966 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
967 | { | |
968 | ec_flag_msi, "MSI hardware", { | |
969 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
970 | { | |
971 | ec_flag_msi, "MSI hardware", { | |
972 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 AS |
973 | { |
974 | ec_validate_ecdt, "ASUS hardware", { | |
975 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
976 | {}, | |
977 | }; | |
978 | ||
979 | ||
c0900c35 AS |
980 | int __init acpi_ec_ecdt_probe(void) |
981 | { | |
c0900c35 | 982 | acpi_status status; |
c6cb0e87 | 983 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 984 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 985 | |
d66d969d AS |
986 | boot_ec = make_acpi_ec(); |
987 | if (!boot_ec) | |
c0900c35 AS |
988 | return -ENOMEM; |
989 | /* | |
990 | * Generate a boot ec context | |
991 | */ | |
0adf3c74 | 992 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
993 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
994 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 995 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 996 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
997 | boot_ec->command_addr = ecdt_ptr->control.address; |
998 | boot_ec->data_addr = ecdt_ptr->data.address; | |
999 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1000 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1001 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1002 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1003 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1004 | goto install; |
c6cb0e87 AS |
1005 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1006 | if (!saved_ec) | |
1007 | return -ENOMEM; | |
a5032bfd | 1008 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 1009 | /* fall through */ |
cd8c93a4 | 1010 | } |
0adf3c74 | 1011 | |
478fa03b AS |
1012 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1013 | return -ENODEV; | |
1014 | ||
c5279dee AS |
1015 | /* This workaround is needed only on some broken machines, |
1016 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1017 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1018 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1019 | boot_ec, NULL); | |
1020 | /* Check that acpi_get_devices actually find something */ | |
1021 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1022 | goto error; | |
c6cb0e87 AS |
1023 | if (saved_ec) { |
1024 | /* try to find good ECDT from ASUSTek */ | |
1025 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1026 | saved_ec->data_addr != boot_ec->data_addr || | |
1027 | saved_ec->gpe != boot_ec->gpe || | |
1028 | saved_ec->handle != boot_ec->handle) | |
1029 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1030 | "ECDT tables, which are very hard to workaround. " | |
1031 | "Trying to use DSDT EC info instead. Please send " | |
1032 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1033 | kfree(saved_ec); | |
1034 | saved_ec = NULL; | |
1035 | } else { | |
1036 | /* We really need to limit this workaround, the only ASUS, | |
1037 | * which needs it, has fake EC._INI method, so use it as flag. | |
1038 | * Keep boot_ec struct as it will be needed soon. | |
1039 | */ | |
1040 | acpi_handle dummy; | |
1041 | if (!dmi_name_in_vendors("ASUS") || | |
1042 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1043 | &dummy))) | |
1044 | return -ENODEV; | |
1045 | } | |
c5279dee AS |
1046 | install: |
1047 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1048 | first_ec = boot_ec; |
e8284321 | 1049 | return 0; |
d033879c | 1050 | } |
c5279dee | 1051 | error: |
d66d969d AS |
1052 | kfree(boot_ec); |
1053 | boot_ec = NULL; | |
1da177e4 LT |
1054 | return -ENODEV; |
1055 | } | |
1056 | ||
223883b7 AS |
1057 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1058 | { | |
1059 | struct acpi_ec *ec = acpi_driver_data(device); | |
1060 | /* Stop using GPE */ | |
0b7084ac | 1061 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1062 | return 0; |
1063 | } | |
1064 | ||
1065 | static int acpi_ec_resume(struct acpi_device *device) | |
1066 | { | |
1067 | struct acpi_ec *ec = acpi_driver_data(device); | |
1068 | /* Enable use of GPE back */ | |
0b7084ac | 1069 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1070 | return 0; |
1071 | } | |
1072 | ||
1073 | static struct acpi_driver acpi_ec_driver = { | |
1074 | .name = "ec", | |
1075 | .class = ACPI_EC_CLASS, | |
1076 | .ids = ec_device_ids, | |
1077 | .ops = { | |
1078 | .add = acpi_ec_add, | |
1079 | .remove = acpi_ec_remove, | |
223883b7 AS |
1080 | .suspend = acpi_ec_suspend, |
1081 | .resume = acpi_ec_resume, | |
1082 | }, | |
1083 | }; | |
1084 | ||
a5f820fe | 1085 | int __init acpi_ec_init(void) |
1da177e4 | 1086 | { |
50526df6 | 1087 | int result = 0; |
1da177e4 | 1088 | |
1da177e4 LT |
1089 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1090 | if (!acpi_ec_dir) | |
d550d98d | 1091 | return -ENODEV; |
1da177e4 LT |
1092 | |
1093 | /* Now register the driver for the EC */ | |
1094 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1095 | if (result < 0) { | |
1096 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1097 | return -ENODEV; |
1da177e4 LT |
1098 | } |
1099 | ||
d550d98d | 1100 | return result; |
1da177e4 LT |
1101 | } |
1102 | ||
1da177e4 LT |
1103 | /* EC driver currently not unloadable */ |
1104 | #if 0 | |
50526df6 | 1105 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1106 | { |
1da177e4 LT |
1107 | |
1108 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1109 | ||
1110 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1111 | ||
d550d98d | 1112 | return; |
1da177e4 | 1113 | } |
7843932a | 1114 | #endif /* 0 */ |