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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> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
1da177e4 LT |
43 | #include <asm/io.h> |
44 | #include <acpi/acpi_bus.h> | |
45 | #include <acpi/acpi_drivers.h> | |
eb27cae8 | 46 | #include <linux/dmi.h> |
1da177e4 | 47 | |
1da177e4 | 48 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
49 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
50 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 51 | |
af3fd140 | 52 | #define PREFIX "ACPI: EC: " |
4350933a | 53 | |
703959d4 | 54 | /* EC status register */ |
1da177e4 LT |
55 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
56 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 57 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 58 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 59 | |
703959d4 | 60 | /* EC commands */ |
3261ff4d | 61 | enum ec_command { |
6ccedb10 AS |
62 | ACPI_EC_COMMAND_READ = 0x80, |
63 | ACPI_EC_COMMAND_WRITE = 0x81, | |
64 | ACPI_EC_BURST_ENABLE = 0x82, | |
65 | ACPI_EC_BURST_DISABLE = 0x83, | |
66 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 67 | }; |
837012ed | 68 | |
5c406412 | 69 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 70 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
34ff4dbc | 71 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
2a84cb98 | 72 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 73 | |
06cf7d3c | 74 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
75 | per one transaction */ |
76 | ||
080e412c | 77 | enum { |
080e412c | 78 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 79 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 80 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 81 | * OpReg are installed */ |
f6bb13aa | 82 | EC_FLAGS_FROZEN, /* Transactions are suspended */ |
1da177e4 | 83 | }; |
6ffb221a DS |
84 | |
85 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 86 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
87 | typedef int (*acpi_ec_query_func) (void *data); |
88 | ||
89 | struct acpi_ec_query_handler { | |
90 | struct list_head node; | |
91 | acpi_ec_query_func func; | |
92 | acpi_handle handle; | |
93 | void *data; | |
94 | u8 query_bit; | |
95 | }; | |
96 | ||
8463200a | 97 | struct transaction { |
7c6db4e0 AS |
98 | const u8 *wdata; |
99 | u8 *rdata; | |
100 | unsigned short irq_count; | |
8463200a | 101 | u8 command; |
a2f93aea AS |
102 | u8 wi; |
103 | u8 ri; | |
7c6db4e0 AS |
104 | u8 wlen; |
105 | u8 rlen; | |
dd15f8c4 | 106 | bool done; |
7c6db4e0 AS |
107 | }; |
108 | ||
a854e08a | 109 | static struct acpi_ec { |
703959d4 | 110 | acpi_handle handle; |
a86e2772 | 111 | unsigned long gpe; |
6ffb221a DS |
112 | unsigned long command_addr; |
113 | unsigned long data_addr; | |
703959d4 | 114 | unsigned long global_lock; |
080e412c | 115 | unsigned long flags; |
c787a855 | 116 | struct mutex lock; |
703959d4 | 117 | wait_queue_head_t wait; |
837012ed | 118 | struct list_head list; |
8463200a AS |
119 | struct transaction *curr; |
120 | spinlock_t curr_lock; | |
d033879c | 121 | } *boot_ec, *first_ec; |
703959d4 | 122 | |
5423a0cb | 123 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 124 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 125 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
5423a0cb | 126 | |
1da177e4 LT |
127 | /* -------------------------------------------------------------------------- |
128 | Transaction Management | |
129 | -------------------------------------------------------------------------- */ | |
130 | ||
6ffb221a | 131 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 132 | { |
3ebe08a7 | 133 | u8 x = inb(ec->command_addr); |
86dae015 | 134 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 135 | return x; |
451566f4 DT |
136 | } |
137 | ||
6ffb221a | 138 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 139 | { |
3ebe08a7 | 140 | u8 x = inb(ec->data_addr); |
86dae015 | 141 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 142 | return x; |
7c6db5e5 DS |
143 | } |
144 | ||
6ffb221a | 145 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 146 | { |
86dae015 | 147 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 148 | outb(command, ec->command_addr); |
45bea155 LY |
149 | } |
150 | ||
6ffb221a | 151 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 152 | { |
86dae015 | 153 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 154 | outb(data, ec->data_addr); |
703959d4 | 155 | } |
45bea155 | 156 | |
7c6db4e0 | 157 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 158 | { |
7c6db4e0 AS |
159 | unsigned long flags; |
160 | int ret = 0; | |
8463200a | 161 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 162 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 163 | ret = 1; |
8463200a | 164 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 165 | return ret; |
45bea155 | 166 | } |
451566f4 | 167 | |
a2f93aea AS |
168 | static void start_transaction(struct acpi_ec *ec) |
169 | { | |
170 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
171 | ec->curr->done = false; | |
172 | acpi_ec_write_cmd(ec, ec->curr->command); | |
173 | } | |
174 | ||
2a84cb98 | 175 | static void advance_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 176 | { |
7c6db4e0 | 177 | unsigned long flags; |
8463200a AS |
178 | spin_lock_irqsave(&ec->curr_lock, flags); |
179 | if (!ec->curr) | |
7c6db4e0 | 180 | goto unlock; |
a2f93aea AS |
181 | if (ec->curr->wlen > ec->curr->wi) { |
182 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
183 | acpi_ec_write_data(ec, | |
184 | ec->curr->wdata[ec->curr->wi++]); | |
185 | else | |
dd15f8c4 | 186 | goto err; |
a2f93aea | 187 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 188 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
189 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
190 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 191 | ec->curr->done = true; |
7c6db4e0 | 192 | } else |
dd15f8c4 | 193 | goto err; |
a2f93aea AS |
194 | } else if (ec->curr->wlen == ec->curr->wi && |
195 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
196 | ec->curr->done = true; |
197 | goto unlock; | |
198 | err: | |
199 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
200 | if (in_interrupt()) |
201 | ++ec->curr->irq_count; | |
7c6db4e0 | 202 | unlock: |
8463200a | 203 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 204 | } |
03d1d99c | 205 | |
a62e8f19 | 206 | static int acpi_ec_sync_query(struct acpi_ec *ec); |
7c6db4e0 | 207 | |
a62e8f19 | 208 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 209 | { |
7c6db4e0 AS |
210 | if (state & ACPI_EC_FLAG_SCI) { |
211 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
a62e8f19 | 212 | return acpi_ec_sync_query(ec); |
7c6db4e0 AS |
213 | } |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int ec_poll(struct acpi_ec *ec) | |
218 | { | |
2a84cb98 AS |
219 | unsigned long flags; |
220 | int repeat = 2; /* number of command restarts */ | |
221 | while (repeat--) { | |
222 | unsigned long delay = jiffies + | |
223 | msecs_to_jiffies(ACPI_EC_DELAY); | |
224 | do { | |
225 | /* don't sleep with disabled interrupts */ | |
226 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
227 | udelay(ACPI_EC_MSI_UDELAY); | |
228 | if (ec_transaction_done(ec)) | |
229 | return 0; | |
230 | } else { | |
231 | if (wait_event_timeout(ec->wait, | |
232 | ec_transaction_done(ec), | |
233 | msecs_to_jiffies(1))) | |
234 | return 0; | |
235 | } | |
236 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
237 | } while (time_before(jiffies, delay)); | |
e12ac3d0 | 238 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
2a84cb98 | 239 | break; |
2a84cb98 AS |
240 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
241 | spin_lock_irqsave(&ec->curr_lock, flags); | |
242 | start_transaction(ec); | |
243 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 244 | } |
b77d81b2 | 245 | return -ETIME; |
1da177e4 LT |
246 | } |
247 | ||
8463200a | 248 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 249 | struct transaction *t) |
45bea155 | 250 | { |
7c6db4e0 | 251 | unsigned long tmp; |
7c6db4e0 | 252 | int ret = 0; |
5423a0cb | 253 | if (EC_FLAGS_MSI) |
2a84cb98 | 254 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 255 | /* start transaction */ |
8463200a | 256 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 257 | /* following two actions should be kept atomic */ |
8463200a | 258 | ec->curr = t; |
a2f93aea | 259 | start_transaction(ec); |
8463200a | 260 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 261 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 262 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 263 | ret = ec_poll(ec); |
8463200a AS |
264 | spin_lock_irqsave(&ec->curr_lock, tmp); |
265 | ec->curr = NULL; | |
266 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
267 | return ret; |
268 | } | |
269 | ||
270 | static int ec_check_ibf0(struct acpi_ec *ec) | |
271 | { | |
272 | u8 status = acpi_ec_read_status(ec); | |
273 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
274 | } |
275 | ||
c0ff1772 AS |
276 | static int ec_wait_ibf0(struct acpi_ec *ec) |
277 | { | |
278 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
279 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 280 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
281 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
282 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
283 | return 0; |
284 | return -ETIME; | |
45bea155 LY |
285 | } |
286 | ||
2a84cb98 | 287 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 288 | { |
d7a76e4c | 289 | int status; |
50526df6 | 290 | u32 glk; |
8463200a | 291 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 292 | return -EINVAL; |
8463200a AS |
293 | if (t->rdata) |
294 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 295 | mutex_lock(&ec->lock); |
f6bb13aa RW |
296 | if (test_bit(EC_FLAGS_FROZEN, &ec->flags)) { |
297 | status = -EINVAL; | |
298 | goto unlock; | |
299 | } | |
703959d4 | 300 | if (ec->global_lock) { |
1da177e4 | 301 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 302 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
303 | status = -ENODEV; |
304 | goto unlock; | |
c24e912b | 305 | } |
1da177e4 | 306 | } |
c0ff1772 | 307 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
308 | pr_err(PREFIX "input buffer is not empty, " |
309 | "aborting transaction\n"); | |
7c6db4e0 | 310 | status = -ETIME; |
451566f4 | 311 | goto end; |
716e084e | 312 | } |
a62e8f19 AS |
313 | pr_debug(PREFIX "transaction start\n"); |
314 | /* disable GPE during transaction if storm is detected */ | |
315 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
cbbc0de7 RW |
316 | /* |
317 | * It has to be disabled at the hardware level regardless of the | |
318 | * GPE reference counting, so that it doesn't trigger. | |
319 | */ | |
9630bdd9 | 320 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
a62e8f19 AS |
321 | } |
322 | ||
2a84cb98 | 323 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
324 | |
325 | /* check if we received SCI during transaction */ | |
326 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
327 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 328 | msleep(1); |
cbbc0de7 RW |
329 | /* |
330 | * It is safe to enable the GPE outside of the transaction. Use | |
331 | * acpi_set_gpe() for that, since we used it to disable the GPE | |
332 | * above. | |
333 | */ | |
9630bdd9 | 334 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
a62e8f19 AS |
335 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
336 | pr_info(PREFIX "GPE storm detected, " | |
337 | "transactions will use polling mode\n"); | |
338 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
339 | } | |
54070101 | 340 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 | 341 | end: |
703959d4 | 342 | if (ec->global_lock) |
1da177e4 | 343 | acpi_release_global_lock(glk); |
7c6db4e0 | 344 | unlock: |
523953b4 | 345 | mutex_unlock(&ec->lock); |
d550d98d | 346 | return status; |
1da177e4 LT |
347 | } |
348 | ||
8a383ef0 | 349 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
350 | { |
351 | u8 d; | |
8463200a AS |
352 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
353 | .wdata = NULL, .rdata = &d, | |
354 | .wlen = 0, .rlen = 1}; | |
355 | ||
2a84cb98 | 356 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
357 | } |
358 | ||
8a383ef0 | 359 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 360 | { |
8463200a AS |
361 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
362 | .wdata = NULL, .rdata = NULL, | |
363 | .wlen = 0, .rlen = 0}; | |
364 | ||
7c6db4e0 | 365 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 366 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
367 | } |
368 | ||
6ccedb10 | 369 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
370 | { |
371 | int result; | |
372 | u8 d; | |
8463200a AS |
373 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
374 | .wdata = &address, .rdata = &d, | |
375 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 376 | |
2a84cb98 | 377 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
378 | *data = d; |
379 | return result; | |
380 | } | |
6ffb221a | 381 | |
3576cf61 DS |
382 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
383 | { | |
6ccedb10 | 384 | u8 wdata[2] = { address, data }; |
8463200a AS |
385 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
386 | .wdata = wdata, .rdata = NULL, | |
387 | .wlen = 2, .rlen = 0}; | |
388 | ||
2a84cb98 | 389 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
390 | } |
391 | ||
1da177e4 LT |
392 | /* |
393 | * Externally callable EC access functions. For now, assume 1 EC only | |
394 | */ | |
c45aac43 AS |
395 | int ec_burst_enable(void) |
396 | { | |
c45aac43 AS |
397 | if (!first_ec) |
398 | return -ENODEV; | |
d033879c | 399 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
400 | } |
401 | ||
402 | EXPORT_SYMBOL(ec_burst_enable); | |
403 | ||
404 | int ec_burst_disable(void) | |
405 | { | |
c45aac43 AS |
406 | if (!first_ec) |
407 | return -ENODEV; | |
d033879c | 408 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
409 | } |
410 | ||
411 | EXPORT_SYMBOL(ec_burst_disable); | |
412 | ||
6ccedb10 | 413 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 414 | { |
1da177e4 | 415 | int err; |
6ffb221a | 416 | u8 temp_data; |
1da177e4 LT |
417 | |
418 | if (!first_ec) | |
419 | return -ENODEV; | |
420 | ||
d033879c | 421 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
422 | |
423 | if (!err) { | |
424 | *val = temp_data; | |
425 | return 0; | |
50526df6 | 426 | } else |
1da177e4 LT |
427 | return err; |
428 | } | |
50526df6 | 429 | |
1da177e4 LT |
430 | EXPORT_SYMBOL(ec_read); |
431 | ||
50526df6 | 432 | int ec_write(u8 addr, u8 val) |
1da177e4 | 433 | { |
1da177e4 LT |
434 | int err; |
435 | ||
436 | if (!first_ec) | |
437 | return -ENODEV; | |
438 | ||
d033879c | 439 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
440 | |
441 | return err; | |
442 | } | |
50526df6 | 443 | |
1da177e4 LT |
444 | EXPORT_SYMBOL(ec_write); |
445 | ||
616362de | 446 | int ec_transaction(u8 command, |
9e197219 | 447 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
448 | u8 * rdata, unsigned rdata_len, |
449 | int force_poll) | |
45bea155 | 450 | { |
8463200a AS |
451 | struct transaction t = {.command = command, |
452 | .wdata = wdata, .rdata = rdata, | |
453 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
454 | if (!first_ec) |
455 | return -ENODEV; | |
45bea155 | 456 | |
2a84cb98 | 457 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 458 | } |
1da177e4 | 459 | |
ab9e43c6 LP |
460 | EXPORT_SYMBOL(ec_transaction); |
461 | ||
f6bb13aa RW |
462 | void acpi_ec_suspend_transactions(void) |
463 | { | |
464 | struct acpi_ec *ec = first_ec; | |
465 | ||
466 | if (!ec) | |
467 | return; | |
468 | ||
469 | mutex_lock(&ec->lock); | |
470 | /* Prevent transactions from being carried out */ | |
471 | set_bit(EC_FLAGS_FROZEN, &ec->flags); | |
472 | mutex_unlock(&ec->lock); | |
473 | } | |
474 | ||
475 | void acpi_ec_resume_transactions(void) | |
476 | { | |
477 | struct acpi_ec *ec = first_ec; | |
478 | ||
479 | if (!ec) | |
480 | return; | |
481 | ||
482 | mutex_lock(&ec->lock); | |
483 | /* Allow transactions to be carried out again */ | |
484 | clear_bit(EC_FLAGS_FROZEN, &ec->flags); | |
485 | mutex_unlock(&ec->lock); | |
486 | } | |
487 | ||
d5a64513 RW |
488 | void acpi_ec_resume_transactions_early(void) |
489 | { | |
490 | /* | |
491 | * Allow transactions to happen again (this function is called from | |
492 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
493 | */ | |
494 | if (first_ec) | |
495 | clear_bit(EC_FLAGS_FROZEN, &first_ec->flags); | |
496 | } | |
497 | ||
a62e8f19 | 498 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
499 | { |
500 | int result; | |
6ccedb10 | 501 | u8 d; |
8463200a AS |
502 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
503 | .wdata = NULL, .rdata = &d, | |
504 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
505 | if (!ec || !data) |
506 | return -EINVAL; | |
6ccedb10 AS |
507 | /* |
508 | * Query the EC to find out which _Qxx method we need to evaluate. | |
509 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
510 | * bit to be cleared (and thus clearing the interrupt source). | |
511 | */ | |
a62e8f19 | 512 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
513 | if (result) |
514 | return result; | |
6ccedb10 AS |
515 | if (!d) |
516 | return -ENODATA; | |
6ccedb10 AS |
517 | *data = d; |
518 | return 0; | |
1da177e4 LT |
519 | } |
520 | ||
1da177e4 LT |
521 | /* -------------------------------------------------------------------------- |
522 | Event Management | |
523 | -------------------------------------------------------------------------- */ | |
837012ed AS |
524 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
525 | acpi_handle handle, acpi_ec_query_func func, | |
526 | void *data) | |
527 | { | |
528 | struct acpi_ec_query_handler *handler = | |
529 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
530 | if (!handler) | |
531 | return -ENOMEM; | |
532 | ||
533 | handler->query_bit = query_bit; | |
534 | handler->handle = handle; | |
535 | handler->func = func; | |
536 | handler->data = data; | |
537 | mutex_lock(&ec->lock); | |
30c08574 | 538 | list_add(&handler->node, &ec->list); |
837012ed AS |
539 | mutex_unlock(&ec->lock); |
540 | return 0; | |
541 | } | |
542 | ||
543 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
544 | ||
545 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
546 | { | |
1544fdbc | 547 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 548 | mutex_lock(&ec->lock); |
1544fdbc | 549 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
550 | if (query_bit == handler->query_bit) { |
551 | list_del(&handler->node); | |
552 | kfree(handler); | |
837012ed AS |
553 | } |
554 | } | |
555 | mutex_unlock(&ec->lock); | |
556 | } | |
557 | ||
558 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 559 | |
a62e8f19 | 560 | static void acpi_ec_run(void *cxt) |
45bea155 | 561 | { |
a62e8f19 AS |
562 | struct acpi_ec_query_handler *handler = cxt; |
563 | if (!handler) | |
e41334c0 | 564 | return; |
a62e8f19 AS |
565 | pr_debug(PREFIX "start query execution\n"); |
566 | if (handler->func) | |
567 | handler->func(handler->data); | |
568 | else if (handler->handle) | |
569 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
570 | pr_debug(PREFIX "stop query execution\n"); | |
571 | kfree(handler); | |
572 | } | |
573 | ||
574 | static int acpi_ec_sync_query(struct acpi_ec *ec) | |
575 | { | |
576 | u8 value = 0; | |
577 | int status; | |
578 | struct acpi_ec_query_handler *handler, *copy; | |
579 | if ((status = acpi_ec_query_unlocked(ec, &value))) | |
580 | return status; | |
837012ed AS |
581 | list_for_each_entry(handler, &ec->list, node) { |
582 | if (value == handler->query_bit) { | |
583 | /* have custom handler for this bit */ | |
a62e8f19 AS |
584 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
585 | if (!copy) | |
586 | return -ENOMEM; | |
587 | memcpy(copy, handler, sizeof(*copy)); | |
588 | pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); | |
f5347867 AS |
589 | return acpi_os_execute((copy->func) ? |
590 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 591 | acpi_ec_run, copy); |
837012ed AS |
592 | } |
593 | } | |
a62e8f19 AS |
594 | return 0; |
595 | } | |
596 | ||
597 | static void acpi_ec_gpe_query(void *ec_cxt) | |
598 | { | |
599 | struct acpi_ec *ec = ec_cxt; | |
600 | if (!ec) | |
601 | return; | |
602 | mutex_lock(&ec->lock); | |
603 | acpi_ec_sync_query(ec); | |
837012ed | 604 | mutex_unlock(&ec->lock); |
45bea155 | 605 | } |
1da177e4 | 606 | |
a62e8f19 AS |
607 | static void acpi_ec_gpe_query(void *ec_cxt); |
608 | ||
609 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
610 | { | |
611 | if (state & ACPI_EC_FLAG_SCI) { | |
612 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
613 | pr_debug(PREFIX "push gpe query to the queue\n"); | |
614 | return acpi_os_execute(OSL_NOTIFY_HANDLER, | |
615 | acpi_ec_gpe_query, ec); | |
616 | } | |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
50526df6 | 621 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 622 | { |
3d02b90b | 623 | struct acpi_ec *ec = data; |
00eb43a1 | 624 | |
3ebe08a7 | 625 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 | 626 | |
a62e8f19 AS |
627 | advance_transaction(ec, acpi_ec_read_status(ec)); |
628 | if (ec_transaction_done(ec) && | |
629 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
2a84cb98 | 630 | wake_up(&ec->wait); |
a62e8f19 AS |
631 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
632 | } | |
7c6db4e0 | 633 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
634 | } |
635 | ||
1da177e4 LT |
636 | /* -------------------------------------------------------------------------- |
637 | Address Space Management | |
638 | -------------------------------------------------------------------------- */ | |
639 | ||
1da177e4 | 640 | static acpi_status |
5b7734b4 | 641 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 642 | u32 bits, u64 *value64, |
50526df6 | 643 | void *handler_context, void *region_context) |
1da177e4 | 644 | { |
3d02b90b | 645 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
646 | int result = 0, i, bytes = bits / 8; |
647 | u8 *value = (u8 *)value64; | |
1da177e4 | 648 | |
1da177e4 | 649 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 650 | return AE_BAD_PARAMETER; |
1da177e4 | 651 | |
5b7734b4 | 652 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 653 | return AE_BAD_PARAMETER; |
1da177e4 | 654 | |
dadf28a1 | 655 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 656 | acpi_ec_burst_enable(ec); |
b3b233c7 | 657 | |
dadf28a1 AS |
658 | for (i = 0; i < bytes; ++i, ++address, ++value) |
659 | result = (function == ACPI_READ) ? | |
660 | acpi_ec_read(ec, address, value) : | |
661 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 662 | |
dadf28a1 | 663 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 664 | acpi_ec_burst_disable(ec); |
b3b233c7 | 665 | |
1da177e4 LT |
666 | switch (result) { |
667 | case -EINVAL: | |
d550d98d | 668 | return AE_BAD_PARAMETER; |
1da177e4 LT |
669 | break; |
670 | case -ENODEV: | |
d550d98d | 671 | return AE_NOT_FOUND; |
1da177e4 LT |
672 | break; |
673 | case -ETIME: | |
d550d98d | 674 | return AE_TIME; |
1da177e4 LT |
675 | break; |
676 | default: | |
d550d98d | 677 | return AE_OK; |
1da177e4 | 678 | } |
1da177e4 LT |
679 | } |
680 | ||
1da177e4 LT |
681 | /* -------------------------------------------------------------------------- |
682 | FS Interface (/proc) | |
683 | -------------------------------------------------------------------------- */ | |
684 | ||
50526df6 | 685 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 686 | |
50526df6 | 687 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 688 | { |
3d02b90b | 689 | struct acpi_ec *ec = seq->private; |
1da177e4 | 690 | |
1da177e4 LT |
691 | if (!ec) |
692 | goto end; | |
693 | ||
01f22462 AS |
694 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
695 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
696 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
697 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 698 | ec->global_lock ? "yes" : "no"); |
50526df6 | 699 | end: |
d550d98d | 700 | return 0; |
1da177e4 LT |
701 | } |
702 | ||
703 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
704 | { | |
705 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
706 | } | |
707 | ||
070d8eb1 | 708 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
709 | .open = acpi_ec_info_open_fs, |
710 | .read = seq_read, | |
711 | .llseek = seq_lseek, | |
712 | .release = single_release, | |
1da177e4 LT |
713 | .owner = THIS_MODULE, |
714 | }; | |
715 | ||
50526df6 | 716 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 717 | { |
50526df6 | 718 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 719 | |
1da177e4 LT |
720 | if (!acpi_device_dir(device)) { |
721 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 722 | acpi_ec_dir); |
1da177e4 | 723 | if (!acpi_device_dir(device)) |
d550d98d | 724 | return -ENODEV; |
1da177e4 LT |
725 | } |
726 | ||
cf7acfab DL |
727 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
728 | acpi_device_dir(device), | |
729 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 730 | if (!entry) |
d550d98d | 731 | return -ENODEV; |
d550d98d | 732 | return 0; |
1da177e4 LT |
733 | } |
734 | ||
50526df6 | 735 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 736 | { |
1da177e4 LT |
737 | |
738 | if (acpi_device_dir(device)) { | |
739 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
740 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
741 | acpi_device_dir(device) = NULL; | |
742 | } | |
743 | ||
d550d98d | 744 | return 0; |
1da177e4 LT |
745 | } |
746 | ||
1da177e4 LT |
747 | /* -------------------------------------------------------------------------- |
748 | Driver Interface | |
749 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
750 | static acpi_status |
751 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
752 | ||
c0900c35 AS |
753 | static struct acpi_ec *make_acpi_ec(void) |
754 | { | |
755 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
756 | if (!ec) | |
757 | return NULL; | |
080e412c | 758 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
759 | mutex_init(&ec->lock); |
760 | init_waitqueue_head(&ec->wait); | |
837012ed | 761 | INIT_LIST_HEAD(&ec->list); |
8463200a | 762 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
763 | return ec; |
764 | } | |
837012ed | 765 | |
c019b193 AS |
766 | static acpi_status |
767 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
768 | void *context, void **return_value) | |
769 | { | |
0175d562 LM |
770 | char node_name[5]; |
771 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
772 | struct acpi_ec *ec = context; |
773 | int value = 0; | |
0175d562 LM |
774 | acpi_status status; |
775 | ||
776 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
777 | ||
778 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
779 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
780 | } | |
781 | return AE_OK; | |
782 | } | |
783 | ||
cd8c93a4 AS |
784 | static acpi_status |
785 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 786 | { |
cd8c93a4 | 787 | acpi_status status; |
d21cf3c1 | 788 | unsigned long long tmp = 0; |
cd8c93a4 AS |
789 | |
790 | struct acpi_ec *ec = context; | |
a5032bfd AS |
791 | |
792 | /* clear addr values, ec_parse_io_ports depend on it */ | |
793 | ec->command_addr = ec->data_addr = 0; | |
794 | ||
cd8c93a4 AS |
795 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
796 | ec_parse_io_ports, ec); | |
797 | if (ACPI_FAILURE(status)) | |
798 | return status; | |
837012ed AS |
799 | |
800 | /* Get GPE bit assignment (EC events). */ | |
801 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 802 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
803 | if (ACPI_FAILURE(status)) |
804 | return status; | |
27663c58 | 805 | ec->gpe = tmp; |
837012ed | 806 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 807 | tmp = 0; |
27663c58 MW |
808 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
809 | ec->global_lock = tmp; | |
837012ed | 810 | ec->handle = handle; |
cd8c93a4 | 811 | return AE_CTRL_TERMINATE; |
837012ed AS |
812 | } |
813 | ||
5efc5476 BH |
814 | static int ec_install_handlers(struct acpi_ec *ec) |
815 | { | |
816 | acpi_status status; | |
817 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
818 | return 0; | |
819 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
820 | ACPI_GPE_EDGE_TRIGGERED, | |
821 | &acpi_ec_gpe_handler, ec); | |
822 | if (ACPI_FAILURE(status)) | |
823 | return -ENODEV; | |
9630bdd9 RW |
824 | |
825 | acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
5efc5476 BH |
826 | status = acpi_install_address_space_handler(ec->handle, |
827 | ACPI_ADR_SPACE_EC, | |
828 | &acpi_ec_space_handler, | |
829 | NULL, ec); | |
830 | if (ACPI_FAILURE(status)) { | |
831 | if (status == AE_NOT_FOUND) { | |
832 | /* | |
833 | * Maybe OS fails in evaluating the _REG object. | |
834 | * The AE_NOT_FOUND error will be ignored and OS | |
835 | * continue to initialize EC. | |
836 | */ | |
837 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
838 | " of EC device. Broken bios is suspected.\n"); | |
839 | } else { | |
840 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
841 | &acpi_ec_gpe_handler); | |
9630bdd9 | 842 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
5efc5476 BH |
843 | return -ENODEV; |
844 | } | |
845 | } | |
846 | ||
847 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
848 | return 0; | |
849 | } | |
850 | ||
4c611060 AS |
851 | static void ec_remove_handlers(struct acpi_ec *ec) |
852 | { | |
9630bdd9 | 853 | acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
4c611060 AS |
854 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
855 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 856 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
857 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
858 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 859 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 860 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
861 | } |
862 | ||
703959d4 | 863 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 864 | { |
703959d4 | 865 | struct acpi_ec *ec = NULL; |
d02be047 | 866 | int ret; |
45bea155 | 867 | |
c0900c35 AS |
868 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
869 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
870 | ||
4c611060 | 871 | /* Check for boot EC */ |
ce52ddf5 AS |
872 | if (boot_ec && |
873 | (boot_ec->handle == device->handle || | |
874 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
875 | ec = boot_ec; | |
876 | boot_ec = NULL; | |
877 | } else { | |
878 | ec = make_acpi_ec(); | |
879 | if (!ec) | |
880 | return -ENOMEM; | |
a5032bfd AS |
881 | } |
882 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
883 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
884 | kfree(ec); |
885 | return -EINVAL; | |
4c611060 AS |
886 | } |
887 | ||
c0900c35 | 888 | ec->handle = device->handle; |
ce52ddf5 AS |
889 | |
890 | /* Find and register all query methods */ | |
891 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 892 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 893 | |
4c611060 AS |
894 | if (!first_ec) |
895 | first_ec = ec; | |
db89b4f0 | 896 | device->driver_data = ec; |
c0900c35 | 897 | acpi_ec_add_fs(device); |
3ebe08a7 | 898 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 899 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
900 | |
901 | ret = ec_install_handlers(ec); | |
902 | ||
903 | /* EC is fully operational, allow queries */ | |
904 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
905 | return ret; | |
1da177e4 LT |
906 | } |
907 | ||
50526df6 | 908 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 909 | { |
01f22462 | 910 | struct acpi_ec *ec; |
07ddf768 | 911 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 912 | |
1da177e4 | 913 | if (!device) |
d550d98d | 914 | return -EINVAL; |
1da177e4 LT |
915 | |
916 | ec = acpi_driver_data(device); | |
cf745ec7 | 917 | ec_remove_handlers(ec); |
837012ed | 918 | mutex_lock(&ec->lock); |
07ddf768 | 919 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
920 | list_del(&handler->node); |
921 | kfree(handler); | |
922 | } | |
923 | mutex_unlock(&ec->lock); | |
1da177e4 | 924 | acpi_ec_remove_fs(device); |
db89b4f0 | 925 | device->driver_data = NULL; |
d033879c | 926 | if (ec == first_ec) |
c0900c35 | 927 | first_ec = NULL; |
4c611060 | 928 | kfree(ec); |
d550d98d | 929 | return 0; |
1da177e4 LT |
930 | } |
931 | ||
1da177e4 | 932 | static acpi_status |
c0900c35 | 933 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 934 | { |
3d02b90b | 935 | struct acpi_ec *ec = context; |
1da177e4 | 936 | |
01f22462 | 937 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 938 | return AE_OK; |
1da177e4 LT |
939 | |
940 | /* | |
941 | * The first address region returned is the data port, and | |
942 | * the second address region returned is the status/command | |
943 | * port. | |
944 | */ | |
01f22462 | 945 | if (ec->data_addr == 0) |
6ffb221a | 946 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 947 | else if (ec->command_addr == 0) |
6ffb221a | 948 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 949 | else |
1da177e4 | 950 | return AE_CTRL_TERMINATE; |
1da177e4 | 951 | |
1da177e4 LT |
952 | return AE_OK; |
953 | } | |
954 | ||
c04209a7 AS |
955 | int __init acpi_boot_ec_enable(void) |
956 | { | |
7c6db4e0 | 957 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
958 | return 0; |
959 | if (!ec_install_handlers(boot_ec)) { | |
960 | first_ec = boot_ec; | |
961 | return 0; | |
962 | } | |
963 | return -EFAULT; | |
964 | } | |
965 | ||
223883b7 AS |
966 | static const struct acpi_device_id ec_device_ids[] = { |
967 | {"PNP0C09", 0}, | |
968 | {"", 0}, | |
969 | }; | |
970 | ||
478fa03b AS |
971 | /* Some BIOS do not survive early DSDT scan, skip it */ |
972 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
973 | { | |
974 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
975 | return 0; | |
976 | } | |
977 | ||
0adf3c74 AS |
978 | /* ASUStek often supplies us with broken ECDT, validate it */ |
979 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
980 | { | |
981 | EC_FLAGS_VALIDATE_ECDT = 1; | |
982 | return 0; | |
983 | } | |
984 | ||
985 | /* MSI EC needs special treatment, enable it */ | |
986 | static int ec_flag_msi(const struct dmi_system_id *id) | |
987 | { | |
55b313f2 | 988 | printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
989 | EC_FLAGS_MSI = 1; |
990 | EC_FLAGS_VALIDATE_ECDT = 1; | |
991 | return 0; | |
992 | } | |
993 | ||
994 | static struct dmi_system_id __initdata ec_dmi_table[] = { | |
478fa03b AS |
995 | { |
996 | ec_skip_dsdt_scan, "Compal JFL92", { | |
997 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
998 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
999 | { |
1000 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1001 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1002 | { | |
1003 | ec_flag_msi, "MSI hardware", { | |
1004 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1005 | { | |
1006 | ec_flag_msi, "MSI hardware", { | |
1007 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 AS |
1008 | { |
1009 | ec_validate_ecdt, "ASUS hardware", { | |
1010 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
1011 | {}, | |
1012 | }; | |
1013 | ||
1014 | ||
c0900c35 AS |
1015 | int __init acpi_ec_ecdt_probe(void) |
1016 | { | |
c0900c35 | 1017 | acpi_status status; |
c6cb0e87 | 1018 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1019 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1020 | |
d66d969d AS |
1021 | boot_ec = make_acpi_ec(); |
1022 | if (!boot_ec) | |
c0900c35 AS |
1023 | return -ENOMEM; |
1024 | /* | |
1025 | * Generate a boot ec context | |
1026 | */ | |
0adf3c74 | 1027 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1028 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1029 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1030 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 1031 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1032 | boot_ec->command_addr = ecdt_ptr->control.address; |
1033 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1034 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1035 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1036 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1037 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1038 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1039 | goto install; |
c6cb0e87 AS |
1040 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1041 | if (!saved_ec) | |
1042 | return -ENOMEM; | |
a5032bfd | 1043 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 1044 | /* fall through */ |
cd8c93a4 | 1045 | } |
0adf3c74 | 1046 | |
478fa03b AS |
1047 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1048 | return -ENODEV; | |
1049 | ||
c5279dee AS |
1050 | /* This workaround is needed only on some broken machines, |
1051 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
1052 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1053 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1054 | boot_ec, NULL); | |
1055 | /* Check that acpi_get_devices actually find something */ | |
1056 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1057 | goto error; | |
c6cb0e87 AS |
1058 | if (saved_ec) { |
1059 | /* try to find good ECDT from ASUSTek */ | |
1060 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1061 | saved_ec->data_addr != boot_ec->data_addr || | |
1062 | saved_ec->gpe != boot_ec->gpe || | |
1063 | saved_ec->handle != boot_ec->handle) | |
1064 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1065 | "ECDT tables, which are very hard to workaround. " | |
1066 | "Trying to use DSDT EC info instead. Please send " | |
1067 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1068 | kfree(saved_ec); | |
1069 | saved_ec = NULL; | |
1070 | } else { | |
1071 | /* We really need to limit this workaround, the only ASUS, | |
1072 | * which needs it, has fake EC._INI method, so use it as flag. | |
1073 | * Keep boot_ec struct as it will be needed soon. | |
1074 | */ | |
1075 | acpi_handle dummy; | |
1076 | if (!dmi_name_in_vendors("ASUS") || | |
1077 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1078 | &dummy))) | |
1079 | return -ENODEV; | |
1080 | } | |
c5279dee AS |
1081 | install: |
1082 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1083 | first_ec = boot_ec; |
e8284321 | 1084 | return 0; |
d033879c | 1085 | } |
c5279dee | 1086 | error: |
d66d969d AS |
1087 | kfree(boot_ec); |
1088 | boot_ec = NULL; | |
1da177e4 LT |
1089 | return -ENODEV; |
1090 | } | |
1091 | ||
223883b7 AS |
1092 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1093 | { | |
1094 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1095 | /* Stop using the GPE, but keep it reference counted. */ |
9630bdd9 | 1096 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
223883b7 AS |
1097 | return 0; |
1098 | } | |
1099 | ||
1100 | static int acpi_ec_resume(struct acpi_device *device) | |
1101 | { | |
1102 | struct acpi_ec *ec = acpi_driver_data(device); | |
cbbc0de7 | 1103 | /* Enable the GPE again, but don't reference count it once more. */ |
9630bdd9 | 1104 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
223883b7 AS |
1105 | return 0; |
1106 | } | |
1107 | ||
1108 | static struct acpi_driver acpi_ec_driver = { | |
1109 | .name = "ec", | |
1110 | .class = ACPI_EC_CLASS, | |
1111 | .ids = ec_device_ids, | |
1112 | .ops = { | |
1113 | .add = acpi_ec_add, | |
1114 | .remove = acpi_ec_remove, | |
223883b7 AS |
1115 | .suspend = acpi_ec_suspend, |
1116 | .resume = acpi_ec_resume, | |
1117 | }, | |
1118 | }; | |
1119 | ||
a5f820fe | 1120 | int __init acpi_ec_init(void) |
1da177e4 | 1121 | { |
50526df6 | 1122 | int result = 0; |
1da177e4 | 1123 | |
1da177e4 LT |
1124 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1125 | if (!acpi_ec_dir) | |
d550d98d | 1126 | return -ENODEV; |
1da177e4 LT |
1127 | |
1128 | /* Now register the driver for the EC */ | |
1129 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1130 | if (result < 0) { | |
1131 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1132 | return -ENODEV; |
1da177e4 LT |
1133 | } |
1134 | ||
d550d98d | 1135 | return result; |
1da177e4 LT |
1136 | } |
1137 | ||
1da177e4 LT |
1138 | /* EC driver currently not unloadable */ |
1139 | #if 0 | |
50526df6 | 1140 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1141 | { |
1da177e4 LT |
1142 | |
1143 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1144 | ||
1145 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1146 | ||
d550d98d | 1147 | return; |
1da177e4 | 1148 | } |
7843932a | 1149 | #endif /* 0 */ |