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 | 78 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 79 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 80 | * OpReg are installed */ |
f6bb13aa | 81 | EC_FLAGS_FROZEN, /* Transactions are suspended */ |
1da177e4 | 82 | }; |
6ffb221a DS |
83 | |
84 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 85 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
86 | typedef int (*acpi_ec_query_func) (void *data); |
87 | ||
88 | struct acpi_ec_query_handler { | |
89 | struct list_head node; | |
90 | acpi_ec_query_func func; | |
91 | acpi_handle handle; | |
92 | void *data; | |
93 | u8 query_bit; | |
94 | }; | |
95 | ||
8463200a | 96 | struct transaction { |
7c6db4e0 AS |
97 | const u8 *wdata; |
98 | u8 *rdata; | |
99 | unsigned short irq_count; | |
8463200a | 100 | u8 command; |
a2f93aea AS |
101 | u8 wi; |
102 | u8 ri; | |
7c6db4e0 AS |
103 | u8 wlen; |
104 | u8 rlen; | |
dd15f8c4 | 105 | bool done; |
7c6db4e0 AS |
106 | }; |
107 | ||
a854e08a | 108 | static struct acpi_ec { |
703959d4 | 109 | acpi_handle handle; |
a86e2772 | 110 | unsigned long gpe; |
6ffb221a DS |
111 | unsigned long command_addr; |
112 | unsigned long data_addr; | |
703959d4 | 113 | unsigned long global_lock; |
080e412c | 114 | unsigned long flags; |
c787a855 | 115 | struct mutex lock; |
703959d4 | 116 | wait_queue_head_t wait; |
837012ed | 117 | struct list_head list; |
8463200a AS |
118 | struct transaction *curr; |
119 | spinlock_t curr_lock; | |
d033879c | 120 | } *boot_ec, *first_ec; |
703959d4 | 121 | |
5423a0cb | 122 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 123 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 124 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 125 | |
1da177e4 LT |
126 | /* -------------------------------------------------------------------------- |
127 | Transaction Management | |
128 | -------------------------------------------------------------------------- */ | |
129 | ||
6ffb221a | 130 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 131 | { |
3ebe08a7 | 132 | u8 x = inb(ec->command_addr); |
86dae015 | 133 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 134 | return x; |
451566f4 DT |
135 | } |
136 | ||
6ffb221a | 137 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 138 | { |
3ebe08a7 | 139 | u8 x = inb(ec->data_addr); |
86dae015 | 140 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 141 | return x; |
7c6db5e5 DS |
142 | } |
143 | ||
6ffb221a | 144 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 145 | { |
86dae015 | 146 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 147 | outb(command, ec->command_addr); |
45bea155 LY |
148 | } |
149 | ||
6ffb221a | 150 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 151 | { |
86dae015 | 152 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 153 | outb(data, ec->data_addr); |
703959d4 | 154 | } |
45bea155 | 155 | |
7c6db4e0 | 156 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 157 | { |
7c6db4e0 AS |
158 | unsigned long flags; |
159 | int ret = 0; | |
8463200a | 160 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 161 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 162 | ret = 1; |
8463200a | 163 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 164 | return ret; |
45bea155 | 165 | } |
451566f4 | 166 | |
a2f93aea AS |
167 | static void start_transaction(struct acpi_ec *ec) |
168 | { | |
169 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
170 | ec->curr->done = false; | |
171 | acpi_ec_write_cmd(ec, ec->curr->command); | |
172 | } | |
173 | ||
2a84cb98 | 174 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 175 | { |
7c6db4e0 | 176 | unsigned long flags; |
8463200a AS |
177 | spin_lock_irqsave(&ec->curr_lock, flags); |
178 | if (!ec->curr) | |
7c6db4e0 | 179 | goto unlock; |
a2f93aea AS |
180 | if (ec->curr->wlen > ec->curr->wi) { |
181 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
182 | acpi_ec_write_data(ec, | |
183 | ec->curr->wdata[ec->curr->wi++]); | |
184 | else | |
dd15f8c4 | 185 | goto err; |
a2f93aea | 186 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 187 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
188 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
189 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 190 | ec->curr->done = true; |
7c6db4e0 | 191 | } else |
dd15f8c4 | 192 | goto err; |
a2f93aea AS |
193 | } else if (ec->curr->wlen == ec->curr->wi && |
194 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
195 | ec->curr->done = true; |
196 | goto unlock; | |
197 | err: | |
198 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
199 | if (in_interrupt()) |
200 | ++ec->curr->irq_count; | |
7c6db4e0 | 201 | unlock: |
8463200a | 202 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 203 | } |
03d1d99c | 204 | |
a62e8f19 | 205 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 206 | |
a62e8f19 | 207 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 208 | { |
7c6db4e0 AS |
209 | if (state & ACPI_EC_FLAG_SCI) { |
210 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 211 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
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; |
5423a0cb | 252 | if (EC_FLAGS_MSI) |
2a84cb98 | 253 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 254 | /* start transaction */ |
8463200a | 255 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 256 | /* following two actions should be kept atomic */ |
8463200a | 257 | ec->curr = t; |
a2f93aea | 258 | start_transaction(ec); |
8463200a | 259 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 260 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 261 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 262 | ret = ec_poll(ec); |
8463200a AS |
263 | spin_lock_irqsave(&ec->curr_lock, tmp); |
264 | ec->curr = NULL; | |
265 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
266 | return ret; |
267 | } | |
268 | ||
269 | static int ec_check_ibf0(struct acpi_ec *ec) | |
270 | { | |
271 | u8 status = acpi_ec_read_status(ec); | |
272 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
273 | } |
274 | ||
c0ff1772 AS |
275 | static int ec_wait_ibf0(struct acpi_ec *ec) |
276 | { | |
277 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
278 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 279 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
280 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
281 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
282 | return 0; |
283 | return -ETIME; | |
45bea155 LY |
284 | } |
285 | ||
2a84cb98 | 286 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 287 | { |
d7a76e4c | 288 | int status; |
50526df6 | 289 | u32 glk; |
8463200a | 290 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 291 | return -EINVAL; |
8463200a AS |
292 | if (t->rdata) |
293 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 294 | mutex_lock(&ec->lock); |
f6bb13aa RW |
295 | if (test_bit(EC_FLAGS_FROZEN, &ec->flags)) { |
296 | status = -EINVAL; | |
297 | goto unlock; | |
298 | } | |
703959d4 | 299 | if (ec->global_lock) { |
1da177e4 | 300 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 301 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
302 | status = -ENODEV; |
303 | goto unlock; | |
c24e912b | 304 | } |
1da177e4 | 305 | } |
c0ff1772 | 306 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
307 | pr_err(PREFIX "input buffer is not empty, " |
308 | "aborting transaction\n"); | |
7c6db4e0 | 309 | status = -ETIME; |
451566f4 | 310 | goto end; |
716e084e | 311 | } |
a62e8f19 AS |
312 | pr_debug(PREFIX "transaction start\n"); |
313 | /* disable GPE during transaction if storm is detected */ | |
314 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
cbbc0de7 RW |
315 | /* |
316 | * It has to be disabled at the hardware level regardless of the | |
317 | * GPE reference counting, so that it doesn't trigger. | |
318 | */ | |
9630bdd9 | 319 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
a62e8f19 AS |
320 | } |
321 | ||
2a84cb98 | 322 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
323 | |
324 | /* check if we received SCI during transaction */ | |
325 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
326 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 327 | msleep(1); |
cbbc0de7 RW |
328 | /* |
329 | * It is safe to enable the GPE outside of the transaction. Use | |
330 | * acpi_set_gpe() for that, since we used it to disable the GPE | |
331 | * above. | |
332 | */ | |
9630bdd9 | 333 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
a62e8f19 AS |
334 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
335 | pr_info(PREFIX "GPE storm detected, " | |
336 | "transactions will use polling mode\n"); | |
337 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
338 | } | |
54070101 | 339 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 340 | end: |
703959d4 | 341 | if (ec->global_lock) |
1da177e4 | 342 | acpi_release_global_lock(glk); |
7c6db4e0 | 343 | unlock: |
523953b4 | 344 | mutex_unlock(&ec->lock); |
d550d98d | 345 | return status; |
1da177e4 LT |
346 | } |
347 | ||
8a383ef0 | 348 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
349 | { |
350 | u8 d; | |
8463200a AS |
351 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
352 | .wdata = NULL, .rdata = &d, | |
353 | .wlen = 0, .rlen = 1}; | |
354 | ||
2a84cb98 | 355 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
356 | } |
357 | ||
8a383ef0 | 358 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 359 | { |
8463200a AS |
360 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
361 | .wdata = NULL, .rdata = NULL, | |
362 | .wlen = 0, .rlen = 0}; | |
363 | ||
7c6db4e0 | 364 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 365 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
366 | } |
367 | ||
6ccedb10 | 368 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
369 | { |
370 | int result; | |
371 | u8 d; | |
8463200a AS |
372 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
373 | .wdata = &address, .rdata = &d, | |
374 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 375 | |
2a84cb98 | 376 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
377 | *data = d; |
378 | return result; | |
379 | } | |
6ffb221a | 380 | |
3576cf61 DS |
381 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
382 | { | |
6ccedb10 | 383 | u8 wdata[2] = { address, data }; |
8463200a AS |
384 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
385 | .wdata = wdata, .rdata = NULL, | |
386 | .wlen = 2, .rlen = 0}; | |
387 | ||
2a84cb98 | 388 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
389 | } |
390 | ||
1da177e4 LT |
391 | /* |
392 | * Externally callable EC access functions. For now, assume 1 EC only | |
393 | */ | |
c45aac43 AS |
394 | int ec_burst_enable(void) |
395 | { | |
c45aac43 AS |
396 | if (!first_ec) |
397 | return -ENODEV; | |
d033879c | 398 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
399 | } |
400 | ||
401 | EXPORT_SYMBOL(ec_burst_enable); | |
402 | ||
403 | int ec_burst_disable(void) | |
404 | { | |
c45aac43 AS |
405 | if (!first_ec) |
406 | return -ENODEV; | |
d033879c | 407 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
408 | } |
409 | ||
410 | EXPORT_SYMBOL(ec_burst_disable); | |
411 | ||
6ccedb10 | 412 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 413 | { |
1da177e4 | 414 | int err; |
6ffb221a | 415 | u8 temp_data; |
1da177e4 LT |
416 | |
417 | if (!first_ec) | |
418 | return -ENODEV; | |
419 | ||
d033879c | 420 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
421 | |
422 | if (!err) { | |
423 | *val = temp_data; | |
424 | return 0; | |
50526df6 | 425 | } else |
1da177e4 LT |
426 | return err; |
427 | } | |
50526df6 | 428 | |
1da177e4 LT |
429 | EXPORT_SYMBOL(ec_read); |
430 | ||
50526df6 | 431 | int ec_write(u8 addr, u8 val) |
1da177e4 | 432 | { |
1da177e4 LT |
433 | int err; |
434 | ||
435 | if (!first_ec) | |
436 | return -ENODEV; | |
437 | ||
d033879c | 438 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
439 | |
440 | return err; | |
441 | } | |
50526df6 | 442 | |
1da177e4 LT |
443 | EXPORT_SYMBOL(ec_write); |
444 | ||
616362de | 445 | int ec_transaction(u8 command, |
9e197219 | 446 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
447 | u8 * rdata, unsigned rdata_len, |
448 | int force_poll) | |
45bea155 | 449 | { |
8463200a AS |
450 | struct transaction t = {.command = command, |
451 | .wdata = wdata, .rdata = rdata, | |
452 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
453 | if (!first_ec) |
454 | return -ENODEV; | |
45bea155 | 455 | |
2a84cb98 | 456 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 457 | } |
1da177e4 | 458 | |
ab9e43c6 LP |
459 | EXPORT_SYMBOL(ec_transaction); |
460 | ||
f6bb13aa RW |
461 | void acpi_ec_suspend_transactions(void) |
462 | { | |
463 | struct acpi_ec *ec = first_ec; | |
464 | ||
465 | if (!ec) | |
466 | return; | |
467 | ||
468 | mutex_lock(&ec->lock); | |
469 | /* Prevent transactions from being carried out */ | |
470 | set_bit(EC_FLAGS_FROZEN, &ec->flags); | |
471 | mutex_unlock(&ec->lock); | |
472 | } | |
473 | ||
474 | void acpi_ec_resume_transactions(void) | |
475 | { | |
476 | struct acpi_ec *ec = first_ec; | |
477 | ||
478 | if (!ec) | |
479 | return; | |
480 | ||
481 | mutex_lock(&ec->lock); | |
482 | /* Allow transactions to be carried out again */ | |
483 | clear_bit(EC_FLAGS_FROZEN, &ec->flags); | |
484 | mutex_unlock(&ec->lock); | |
485 | } | |
486 | ||
a62e8f19 | 487 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
488 | { |
489 | int result; | |
6ccedb10 | 490 | u8 d; |
8463200a AS |
491 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
492 | .wdata = NULL, .rdata = &d, | |
493 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
494 | if (!ec || !data) |
495 | return -EINVAL; | |
6ccedb10 AS |
496 | /* |
497 | * Query the EC to find out which _Qxx method we need to evaluate. | |
498 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
499 | * bit to be cleared (and thus clearing the interrupt source). | |
500 | */ | |
a62e8f19 | 501 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
502 | if (result) |
503 | return result; | |
6ccedb10 AS |
504 | if (!d) |
505 | return -ENODATA; | |
6ccedb10 AS |
506 | *data = d; |
507 | return 0; | |
1da177e4 LT |
508 | } |
509 | ||
1da177e4 LT |
510 | /* -------------------------------------------------------------------------- |
511 | Event Management | |
512 | -------------------------------------------------------------------------- */ | |
837012ed AS |
513 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
514 | acpi_handle handle, acpi_ec_query_func func, | |
515 | void *data) | |
516 | { | |
517 | struct acpi_ec_query_handler *handler = | |
518 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
519 | if (!handler) | |
520 | return -ENOMEM; | |
521 | ||
522 | handler->query_bit = query_bit; | |
523 | handler->handle = handle; | |
524 | handler->func = func; | |
525 | handler->data = data; | |
526 | mutex_lock(&ec->lock); | |
30c08574 | 527 | list_add(&handler->node, &ec->list); |
837012ed AS |
528 | mutex_unlock(&ec->lock); |
529 | return 0; | |
530 | } | |
531 | ||
532 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
533 | ||
534 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
535 | { | |
1544fdbc | 536 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 537 | mutex_lock(&ec->lock); |
1544fdbc | 538 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
539 | if (query_bit == handler->query_bit) { |
540 | list_del(&handler->node); | |
541 | kfree(handler); | |
837012ed AS |
542 | } |
543 | } | |
544 | mutex_unlock(&ec->lock); | |
545 | } | |
546 | ||
547 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 548 | |
a62e8f19 | 549 | static void acpi_ec_run(void *cxt) |
45bea155 | 550 | { |
a62e8f19 AS |
551 | struct acpi_ec_query_handler *handler = cxt; |
552 | if (!handler) | |
e41334c0 | 553 | return; |
a62e8f19 AS |
554 | pr_debug(PREFIX "start query execution\n"); |
555 | if (handler->func) | |
556 | handler->func(handler->data); | |
557 | else if (handler->handle) | |
558 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
559 | pr_debug(PREFIX "stop query execution\n"); | |
560 | kfree(handler); | |
561 | } | |
562 | ||
563 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
564 | { | |
565 | u8 value = 0; | |
566 | int status; | |
567 | struct acpi_ec_query_handler *handler, *copy; | |
568 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
569 | return status; | |
837012ed AS |
570 | list_for_each_entry(handler, &ec->list, node) { |
571 | if (value == handler->query_bit) { | |
572 | /* have custom handler for this bit */ | |
a62e8f19 AS |
573 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
574 | if (!copy) | |
575 | return -ENOMEM; | |
576 | memcpy(copy, handler, sizeof(*copy)); | |
577 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
578 | return acpi_os_execute((copy->func) ? |
579 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 580 | acpi_ec_run, copy); |
837012ed AS |
581 | } |
582 | } | |
a62e8f19 AS |
583 | return 0; |
584 | } | |
585 | ||
586 | static void acpi_ec_gpe_query(void *ec_cxt) | |
587 | { | |
588 | struct acpi_ec *ec = ec_cxt; | |
589 | if (!ec) | |
590 | return; | |
591 | mutex_lock(&ec->lock); | |
592 | acpi_ec_sync_query(ec); | |
837012ed | 593 | mutex_unlock(&ec->lock); |
45bea155 | 594 | } |
1da177e4 | 595 | |
a62e8f19 AS |
596 | static void acpi_ec_gpe_query(void *ec_cxt); |
597 | ||
598 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
599 | { | |
600 | if (state & ACPI_EC_FLAG_SCI) { | |
601 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
602 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
603 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
604 | acpi_ec_gpe_query, ec); | |
605 | } | |
606 | } | |
607 | return 0; | |
608 | } | |
609 | ||
50526df6 | 610 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 611 | { |
3d02b90b | 612 | struct acpi_ec *ec = data; |
00eb43a1 | 613 | |
3ebe08a7 | 614 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 615 | |
a62e8f19 AS |
616 | advance_transaction(ec, acpi_ec_read_status(ec)); |
617 | if (ec_transaction_done(ec) && | |
618 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 619 | wake_up(&ec->wait); |
a62e8f19 AS |
620 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
621 | } | |
7c6db4e0 | 622 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
623 | } |
624 | ||
1da177e4 LT |
625 | /* -------------------------------------------------------------------------- |
626 | Address Space Management | |
627 | -------------------------------------------------------------------------- */ | |
628 | ||
1da177e4 | 629 | static acpi_status |
5b7734b4 | 630 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
439913ff | 631 | u32 bits, u64 *value, |
50526df6 | 632 | void *handler_context, void *region_context) |
1da177e4 | 633 | { |
3d02b90b | 634 | struct acpi_ec *ec = handler_context; |
3e71a87d | 635 | int result = 0, i; |
5b7734b4 | 636 | u8 temp = 0; |
1da177e4 | 637 | |
1da177e4 | 638 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 639 | return AE_BAD_PARAMETER; |
1da177e4 | 640 | |
5b7734b4 | 641 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 642 | return AE_BAD_PARAMETER; |
1da177e4 | 643 | |
5b7734b4 AS |
644 | if (bits != 8 && acpi_strict) |
645 | return AE_BAD_PARAMETER; | |
1da177e4 | 646 | |
6a63b06f AS |
647 | if (EC_FLAGS_MSI) |
648 | acpi_ec_burst_enable(ec); | |
b3b233c7 | 649 | |
3e71a87d AS |
650 | if (function == ACPI_READ) { |
651 | result = acpi_ec_read(ec, address, &temp); | |
652 | *value = temp; | |
653 | } else { | |
654 | temp = 0xff & (*value); | |
655 | result = acpi_ec_write(ec, address, temp); | |
656 | } | |
657 | ||
658 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
659 | ++address; | |
5b7734b4 AS |
660 | if (function == ACPI_READ) { |
661 | result = acpi_ec_read(ec, address, &temp); | |
439913ff | 662 | (*value) |= ((u64)temp) << i; |
5b7734b4 AS |
663 | } else { |
664 | temp = 0xff & ((*value) >> i); | |
665 | result = acpi_ec_write(ec, address, temp); | |
666 | } | |
1da177e4 LT |
667 | } |
668 | ||
6a63b06f AS |
669 | if (EC_FLAGS_MSI) |
670 | acpi_ec_burst_disable(ec); | |
b3b233c7 | 671 | |
1da177e4 LT |
672 | switch (result) { |
673 | case -EINVAL: | |
d550d98d | 674 | return AE_BAD_PARAMETER; |
1da177e4 LT |
675 | break; |
676 | case -ENODEV: | |
d550d98d | 677 | return AE_NOT_FOUND; |
1da177e4 LT |
678 | break; |
679 | case -ETIME: | |
d550d98d | 680 | return AE_TIME; |
1da177e4 LT |
681 | break; |
682 | default: | |
d550d98d | 683 | return AE_OK; |
1da177e4 | 684 | } |
1da177e4 LT |
685 | } |
686 | ||
1da177e4 LT |
687 | /* -------------------------------------------------------------------------- |
688 | FS Interface (/proc) | |
689 | -------------------------------------------------------------------------- */ | |
690 | ||
50526df6 | 691 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 692 | |
50526df6 | 693 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 694 | { |
3d02b90b | 695 | struct acpi_ec *ec = seq->private; |
1da177e4 | 696 | |
1da177e4 LT |
697 | if (!ec) |
698 | goto end; | |
699 | ||
01f22462 AS |
700 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
701 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
702 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
703 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 704 | ec->global_lock ? "yes" : "no"); |
50526df6 | 705 | end: |
d550d98d | 706 | return 0; |
1da177e4 LT |
707 | } |
708 | ||
709 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
710 | { | |
711 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
712 | } | |
713 | ||
070d8eb1 | 714 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
715 | .open = acpi_ec_info_open_fs, |
716 | .read = seq_read, | |
717 | .llseek = seq_lseek, | |
718 | .release = single_release, | |
1da177e4 LT |
719 | .owner = THIS_MODULE, |
720 | }; | |
721 | ||
50526df6 | 722 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 723 | { |
50526df6 | 724 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 725 | |
1da177e4 LT |
726 | if (!acpi_device_dir(device)) { |
727 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 728 | acpi_ec_dir); |
1da177e4 | 729 | if (!acpi_device_dir(device)) |
d550d98d | 730 | return -ENODEV; |
1da177e4 LT |
731 | } |
732 | ||
cf7acfab DL |
733 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
734 | acpi_device_dir(device), | |
735 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 736 | if (!entry) |
d550d98d | 737 | return -ENODEV; |
d550d98d | 738 | return 0; |
1da177e4 LT |
739 | } |
740 | ||
50526df6 | 741 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 742 | { |
1da177e4 LT |
743 | |
744 | if (acpi_device_dir(device)) { | |
745 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
746 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
747 | acpi_device_dir(device) = NULL; | |
748 | } | |
749 | ||
d550d98d | 750 | return 0; |
1da177e4 LT |
751 | } |
752 | ||
1da177e4 LT |
753 | /* -------------------------------------------------------------------------- |
754 | Driver Interface | |
755 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
756 | static acpi_status |
757 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
758 | ||
c0900c35 AS |
759 | static struct acpi_ec *make_acpi_ec(void) |
760 | { | |
761 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
762 | if (!ec) | |
763 | return NULL; | |
080e412c | 764 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
765 | mutex_init(&ec->lock); |
766 | init_waitqueue_head(&ec->wait); | |
837012ed | 767 | INIT_LIST_HEAD(&ec->list); |
8463200a | 768 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
769 | return ec; |
770 | } | |
837012ed | 771 | |
c019b193 AS |
772 | static acpi_status |
773 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
774 | void *context, void **return_value) | |
775 | { | |
0175d562 LM |
776 | char node_name[5]; |
777 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
778 | struct acpi_ec *ec = context; |
779 | int value = 0; | |
0175d562 LM |
780 | acpi_status status; |
781 | ||
782 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
783 | ||
784 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
785 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
786 | } | |
787 | return AE_OK; | |
788 | } | |
789 | ||
cd8c93a4 AS |
790 | static acpi_status |
791 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 792 | { |
cd8c93a4 | 793 | acpi_status status; |
d21cf3c1 | 794 | unsigned long long tmp = 0; |
cd8c93a4 AS |
795 | |
796 | struct acpi_ec *ec = context; | |
a5032bfd AS |
797 | |
798 | /* clear addr values, ec_parse_io_ports depend on it */ | |
799 | ec->command_addr = ec->data_addr = 0; | |
800 | ||
cd8c93a4 AS |
801 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
802 | ec_parse_io_ports, ec); | |
803 | if (ACPI_FAILURE(status)) | |
804 | return status; | |
837012ed AS |
805 | |
806 | /* Get GPE bit assignment (EC events). */ | |
807 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 808 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
809 | if (ACPI_FAILURE(status)) |
810 | return status; | |
27663c58 | 811 | ec->gpe = tmp; |
837012ed | 812 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 813 | tmp = 0; |
27663c58 MW |
814 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
815 | ec->global_lock = tmp; | |
837012ed | 816 | ec->handle = handle; |
cd8c93a4 | 817 | return AE_CTRL_TERMINATE; |
837012ed AS |
818 | } |
819 | ||
5efc5476 BH |
820 | static int ec_install_handlers(struct acpi_ec *ec) |
821 | { | |
822 | acpi_status status; | |
823 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
824 | return 0; | |
825 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
826 | ACPI_GPE_EDGE_TRIGGERED, | |
827 | &acpi_ec_gpe_handler, ec); | |
828 | if (ACPI_FAILURE(status)) | |
829 | return -ENODEV; | |
9630bdd9 RW |
830 | |
831 | acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
5efc5476 BH |
832 | status = acpi_install_address_space_handler(ec->handle, |
833 | ACPI_ADR_SPACE_EC, | |
834 | &acpi_ec_space_handler, | |
835 | NULL, ec); | |
836 | if (ACPI_FAILURE(status)) { | |
837 | if (status == AE_NOT_FOUND) { | |
838 | /* | |
839 | * Maybe OS fails in evaluating the _REG object. | |
840 | * The AE_NOT_FOUND error will be ignored and OS | |
841 | * continue to initialize EC. | |
842 | */ | |
843 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
844 | " of EC device. Broken bios is suspected.\n"); | |
845 | } else { | |
846 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
847 | &acpi_ec_gpe_handler); | |
9630bdd9 | 848 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
5efc5476 BH |
849 | return -ENODEV; |
850 | } | |
851 | } | |
852 | ||
853 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
854 | return 0; | |
855 | } | |
856 | ||
4c611060 AS |
857 | static void ec_remove_handlers(struct acpi_ec *ec) |
858 | { | |
9630bdd9 | 859 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
4c611060 AS |
860 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
861 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 862 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
863 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
864 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 865 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 866 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
867 | } |
868 | ||
703959d4 | 869 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 870 | { |
703959d4 | 871 | struct acpi_ec *ec = NULL; |
d02be047 | 872 | int ret; |
45bea155 | 873 | |
c0900c35 AS |
874 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
875 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
876 | ||
4c611060 | 877 | /* Check for boot EC */ |
ce52ddf5 AS |
878 | if (boot_ec && |
879 | (boot_ec->handle == device->handle || | |
880 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
881 | ec = boot_ec; | |
882 | boot_ec = NULL; | |
883 | } else { | |
884 | ec = make_acpi_ec(); | |
885 | if (!ec) | |
886 | return -ENOMEM; | |
a5032bfd AS |
887 | } |
888 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
889 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
890 | kfree(ec); |
891 | return -EINVAL; | |
4c611060 AS |
892 | } |
893 | ||
c0900c35 | 894 | ec->handle = device->handle; |
ce52ddf5 AS |
895 | |
896 | /* Find and register all query methods */ | |
897 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 898 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 899 | |
4c611060 AS |
900 | if (!first_ec) |
901 | first_ec = ec; | |
db89b4f0 | 902 | device->driver_data = ec; |
c0900c35 | 903 | acpi_ec_add_fs(device); |
3ebe08a7 | 904 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 905 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
906 | |
907 | ret = ec_install_handlers(ec); | |
908 | ||
909 | /* EC is fully operational, allow queries */ | |
910 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
911 | return ret; | |
1da177e4 LT |
912 | } |
913 | ||
50526df6 | 914 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 915 | { |
01f22462 | 916 | struct acpi_ec *ec; |
07ddf768 | 917 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 918 | |
1da177e4 | 919 | if (!device) |
d550d98d | 920 | return -EINVAL; |
1da177e4 LT |
921 | |
922 | ec = acpi_driver_data(device); | |
cf745ec7 | 923 | ec_remove_handlers(ec); |
837012ed | 924 | mutex_lock(&ec->lock); |
07ddf768 | 925 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
926 | list_del(&handler->node); |
927 | kfree(handler); | |
928 | } | |
929 | mutex_unlock(&ec->lock); | |
1da177e4 | 930 | acpi_ec_remove_fs(device); |
db89b4f0 | 931 | device->driver_data = NULL; |
d033879c | 932 | if (ec == first_ec) |
c0900c35 | 933 | first_ec = NULL; |
4c611060 | 934 | kfree(ec); |
d550d98d | 935 | return 0; |
1da177e4 LT |
936 | } |
937 | ||
1da177e4 | 938 | static acpi_status |
c0900c35 | 939 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 940 | { |
3d02b90b | 941 | struct acpi_ec *ec = context; |
1da177e4 | 942 | |
01f22462 | 943 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 944 | return AE_OK; |
1da177e4 LT |
945 | |
946 | /* | |
947 | * The first address region returned is the data port, and | |
948 | * the second address region returned is the status/command | |
949 | * port. | |
950 | */ | |
01f22462 | 951 | if (ec->data_addr == 0) |
6ffb221a | 952 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 953 | else if (ec->command_addr == 0) |
6ffb221a | 954 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 955 | else |
1da177e4 | 956 | return AE_CTRL_TERMINATE; |
1da177e4 | 957 | |
1da177e4 LT |
958 | return AE_OK; |
959 | } | |
960 | ||
c04209a7 AS |
961 | int __init acpi_boot_ec_enable(void) |
962 | { | |
7c6db4e0 | 963 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
964 | return 0; |
965 | if (!ec_install_handlers(boot_ec)) { | |
966 | first_ec = boot_ec; | |
967 | return 0; | |
968 | } | |
969 | return -EFAULT; | |
970 | } | |
971 | ||
223883b7 AS |
972 | static const struct acpi_device_id ec_device_ids[] = { |
973 | {"PNP0C09", 0}, | |
974 | {"", 0}, | |
975 | }; | |
976 | ||
478fa03b AS |
977 | /* Some BIOS do not survive early DSDT scan, skip it */ |
978 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
979 | { | |
980 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
981 | return 0; | |
982 | } | |
983 | ||
0adf3c74 AS |
984 | /* ASUStek often supplies us with broken ECDT, validate it */ |
985 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
986 | { | |
987 | EC_FLAGS_VALIDATE_ECDT = 1; | |
988 | return 0; | |
989 | } | |
990 | ||
991 | /* MSI EC needs special treatment, enable it */ | |
992 | static int ec_flag_msi(const struct dmi_system_id *id) | |
993 | { | |
55b313f2 | 994 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
995 | EC_FLAGS_MSI = 1; |
996 | EC_FLAGS_VALIDATE_ECDT = 1; | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
1001 | { |
1002 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1003 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1004 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1005 | { |
1006 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1007 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1008 | { | |
1009 | ec_flag_msi, "MSI hardware", { | |
1010 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1011 | { | |
1012 | ec_flag_msi, "MSI hardware", { | |
1013 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 AS |
1014 | { |
1015 | ec_validate_ecdt, "ASUS hardware", { | |
1016 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
1017 | {}, | |
1018 | }; | |
1019 | ||
1020 | ||
c0900c35 AS |
1021 | int __init acpi_ec_ecdt_probe(void) |
1022 | { | |
c0900c35 | 1023 | acpi_status status; |
c6cb0e87 | 1024 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1025 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1026 | |
d66d969d AS |
1027 | boot_ec = make_acpi_ec(); |
1028 | if (!boot_ec) | |
c0900c35 AS |
1029 | return -ENOMEM; |
1030 | /* | |
1031 | * Generate a boot ec context | |
1032 | */ | |
0adf3c74 | 1033 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1034 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1035 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1036 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 1037 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1038 | boot_ec->command_addr = ecdt_ptr->control.address; |
1039 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1040 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1041 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1042 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1043 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1044 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1045 | goto install; |
c6cb0e87 AS |
1046 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1047 | if (!saved_ec) | |
1048 | return -ENOMEM; | |
a5032bfd | 1049 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 1050 | /* fall through */ |
cd8c93a4 | 1051 | } |
0adf3c74 | 1052 | |
478fa03b AS |
1053 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1054 | return -ENODEV; | |
1055 | ||
c5279dee AS |
1056 | /* This workaround is needed only on some broken machines, |
1057 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1058 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1059 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1060 | boot_ec, NULL); | |
1061 | /* Check that acpi_get_devices actually find something */ | |
1062 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1063 | goto error; | |
c6cb0e87 AS |
1064 | if (saved_ec) { |
1065 | /* try to find good ECDT from ASUSTek */ | |
1066 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1067 | saved_ec->data_addr != boot_ec->data_addr || | |
1068 | saved_ec->gpe != boot_ec->gpe || | |
1069 | saved_ec->handle != boot_ec->handle) | |
1070 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1071 | "ECDT tables, which are very hard to workaround. " | |
1072 | "Trying to use DSDT EC info instead. Please send " | |
1073 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1074 | kfree(saved_ec); | |
1075 | saved_ec = NULL; | |
1076 | } else { | |
1077 | /* We really need to limit this workaround, the only ASUS, | |
1078 | * which needs it, has fake EC._INI method, so use it as flag. | |
1079 | * Keep boot_ec struct as it will be needed soon. | |
1080 | */ | |
1081 | acpi_handle dummy; | |
1082 | if (!dmi_name_in_vendors("ASUS") || | |
1083 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1084 | &dummy))) | |
1085 | return -ENODEV; | |
1086 | } | |
c5279dee AS |
1087 | install: |
1088 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1089 | first_ec = boot_ec; |
e8284321 | 1090 | return 0; |
d033879c | 1091 | } |
c5279dee | 1092 | error: |
d66d969d AS |
1093 | kfree(boot_ec); |
1094 | boot_ec = NULL; | |
1da177e4 LT |
1095 | return -ENODEV; |
1096 | } | |
1097 | ||
223883b7 AS |
1098 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1099 | { | |
1100 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1101 | /* Stop using the GPE, but keep it reference counted. */ |
9630bdd9 | 1102 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
223883b7 AS |
1103 | return 0; |
1104 | } | |
1105 | ||
1106 | static int acpi_ec_resume(struct acpi_device *device) | |
1107 | { | |
1108 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1109 | /* Enable the GPE again, but don't reference count it once more. */ |
9630bdd9 | 1110 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
223883b7 AS |
1111 | return 0; |
1112 | } | |
1113 | ||
1114 | static struct acpi_driver acpi_ec_driver = { | |
1115 | .name = "ec", | |
1116 | .class = ACPI_EC_CLASS, | |
1117 | .ids = ec_device_ids, | |
1118 | .ops = { | |
1119 | .add = acpi_ec_add, | |
1120 | .remove = acpi_ec_remove, | |
223883b7 AS |
1121 | .suspend = acpi_ec_suspend, |
1122 | .resume = acpi_ec_resume, | |
1123 | }, | |
1124 | }; | |
1125 | ||
a5f820fe | 1126 | int __init acpi_ec_init(void) |
1da177e4 | 1127 | { |
50526df6 | 1128 | int result = 0; |
1da177e4 | 1129 | |
1da177e4 LT |
1130 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1131 | if (!acpi_ec_dir) | |
d550d98d | 1132 | return -ENODEV; |
1da177e4 LT |
1133 | |
1134 | /* Now register the driver for the EC */ | |
1135 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1136 | if (result < 0) { | |
1137 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1138 | return -ENODEV; |
1da177e4 LT |
1139 | } |
1140 | ||
d550d98d | 1141 | return result; |
1da177e4 LT |
1142 | } |
1143 | ||
1da177e4 LT |
1144 | /* EC driver currently not unloadable */ |
1145 | #if 0 | |
50526df6 | 1146 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1147 | { |
1da177e4 LT |
1148 | |
1149 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1150 | ||
1151 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1152 | ||
d550d98d | 1153 | return; |
1da177e4 | 1154 | } |
7843932a | 1155 | #endif /* 0 */ |