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Commit | Line | Data |
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1da177e4 | 1 | /* |
7c6db4e0 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.1) |
1da177e4 | 3 | * |
7c6db4e0 | 4 | * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
01f22462 | 5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
1da177e4 LT |
6 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
7 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
8 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
7c6db4e0 | 29 | /* Uncomment next line to get verbose printout */ |
d772b3b3 MN |
30 | /* #define DEBUG */ |
31 | ||
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/seq_file.h> | |
451566f4 | 39 | #include <linux/interrupt.h> |
837012ed | 40 | #include <linux/list.h> |
7c6db4e0 | 41 | #include <linux/spinlock.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
1da177e4 | 45 | |
1da177e4 | 46 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
48 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 49 | |
af3fd140 | 50 | #define PREFIX "ACPI: EC: " |
4350933a | 51 | |
703959d4 | 52 | /* EC status register */ |
1da177e4 LT |
53 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
54 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 57 | |
703959d4 | 58 | /* EC commands */ |
3261ff4d | 59 | enum ec_command { |
6ccedb10 AS |
60 | ACPI_EC_COMMAND_READ = 0x80, |
61 | ACPI_EC_COMMAND_WRITE = 0x81, | |
62 | ACPI_EC_BURST_ENABLE = 0x82, | |
63 | ACPI_EC_BURST_DISABLE = 0x83, | |
64 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 65 | }; |
837012ed | 66 | |
5c406412 | 67 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 68 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
34ff4dbc | 69 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
703959d4 | 70 | |
06cf7d3c | 71 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
72 | per one transaction */ |
73 | ||
080e412c | 74 | enum { |
080e412c | 75 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
76 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
77 | * for status change */ | |
b77d81b2 | 78 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
7c6db4e0 AS |
79 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
80 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
81 | * OpReg are installed */ | |
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 AS |
122 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
123 | ||
1da177e4 LT |
124 | /* -------------------------------------------------------------------------- |
125 | Transaction Management | |
126 | -------------------------------------------------------------------------- */ | |
127 | ||
6ffb221a | 128 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 129 | { |
3ebe08a7 | 130 | u8 x = inb(ec->command_addr); |
86dae015 | 131 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 132 | return x; |
451566f4 DT |
133 | } |
134 | ||
6ffb221a | 135 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 136 | { |
3ebe08a7 | 137 | u8 x = inb(ec->data_addr); |
86dae015 | 138 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 139 | return x; |
7c6db5e5 DS |
140 | } |
141 | ||
6ffb221a | 142 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 143 | { |
86dae015 | 144 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 145 | outb(command, ec->command_addr); |
45bea155 LY |
146 | } |
147 | ||
6ffb221a | 148 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 149 | { |
86dae015 | 150 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 151 | outb(data, ec->data_addr); |
703959d4 | 152 | } |
45bea155 | 153 | |
7c6db4e0 | 154 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 155 | { |
7c6db4e0 AS |
156 | unsigned long flags; |
157 | int ret = 0; | |
8463200a | 158 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 159 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 160 | ret = 1; |
8463200a | 161 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 162 | return ret; |
45bea155 | 163 | } |
451566f4 | 164 | |
a2f93aea AS |
165 | static void start_transaction(struct acpi_ec *ec) |
166 | { | |
167 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
168 | ec->curr->done = false; | |
169 | acpi_ec_write_cmd(ec, ec->curr->command); | |
170 | } | |
171 | ||
7c6db4e0 | 172 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 173 | { |
7c6db4e0 | 174 | unsigned long flags; |
8463200a AS |
175 | spin_lock_irqsave(&ec->curr_lock, flags); |
176 | if (!ec->curr) | |
7c6db4e0 | 177 | goto unlock; |
a2f93aea AS |
178 | if (ec->curr->wlen > ec->curr->wi) { |
179 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
180 | acpi_ec_write_data(ec, | |
181 | ec->curr->wdata[ec->curr->wi++]); | |
182 | else | |
dd15f8c4 | 183 | goto err; |
a2f93aea | 184 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 185 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
186 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
187 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 188 | ec->curr->done = true; |
7c6db4e0 | 189 | } else |
dd15f8c4 | 190 | goto err; |
a2f93aea AS |
191 | } else if (ec->curr->wlen == ec->curr->wi && |
192 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
193 | ec->curr->done = true; |
194 | goto unlock; | |
195 | err: | |
196 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
197 | if (in_interrupt()) |
198 | ++ec->curr->irq_count; | |
7c6db4e0 | 199 | unlock: |
8463200a | 200 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 201 | } |
03d1d99c | 202 | |
7c6db4e0 | 203 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 204 | { |
7c6db4e0 AS |
205 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
206 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
207 | return 0; | |
a2f93aea AS |
208 | /* try restart command if we get any false interrupts */ |
209 | if (ec->curr->irq_count && | |
210 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
211 | pr_debug(PREFIX "controller reset, restart transaction\n"); | |
212 | start_transaction(ec); | |
213 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), | |
214 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
215 | return 0; | |
216 | } | |
7c6db4e0 AS |
217 | /* missing GPEs, switch back to poll mode */ |
218 | if (printk_ratelimit()) | |
219 | pr_info(PREFIX "missing confirmations, " | |
220 | "switch off interrupt mode.\n"); | |
b77d81b2 | 221 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd | 222 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
7c6db4e0 | 223 | return 1; |
845625cd AS |
224 | } |
225 | ||
7c6db4e0 AS |
226 | static void acpi_ec_gpe_query(void *ec_cxt); |
227 | ||
228 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 229 | { |
7c6db4e0 AS |
230 | if (state & ACPI_EC_FLAG_SCI) { |
231 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
232 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
233 | acpi_ec_gpe_query, ec); | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
34ff4dbc AS |
238 | static void ec_delay(void) |
239 | { | |
240 | /* EC in MSI notebooks don't tolerate delays other than 550 usec */ | |
241 | if (EC_FLAGS_MSI) | |
242 | udelay(ACPI_EC_DELAY); | |
243 | else | |
244 | /* Use shortest sleep available */ | |
245 | msleep(1); | |
246 | } | |
247 | ||
7c6db4e0 AS |
248 | static int ec_poll(struct acpi_ec *ec) |
249 | { | |
250 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
34ff4dbc | 251 | udelay(ACPI_EC_CDELAY); |
7c6db4e0 AS |
252 | while (time_before(jiffies, delay)) { |
253 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
34ff4dbc | 254 | ec_delay(); |
7c6db4e0 | 255 | if (ec_transaction_done(ec)) |
9d699ed9 | 256 | return 0; |
af3fd140 | 257 | } |
b77d81b2 | 258 | return -ETIME; |
1da177e4 LT |
259 | } |
260 | ||
8463200a AS |
261 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
262 | struct transaction *t, | |
00eb43a1 | 263 | int force_poll) |
45bea155 | 264 | { |
7c6db4e0 | 265 | unsigned long tmp; |
7c6db4e0 | 266 | int ret = 0; |
3ebe08a7 | 267 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
268 | /* disable GPE during transaction if storm is detected */ |
269 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
270 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 271 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 272 | } |
5423a0cb AS |
273 | if (EC_FLAGS_MSI) |
274 | udelay(ACPI_EC_DELAY); | |
7c6db4e0 | 275 | /* start transaction */ |
8463200a | 276 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 277 | /* following two actions should be kept atomic */ |
8463200a | 278 | ec->curr = t; |
a2f93aea | 279 | start_transaction(ec); |
8463200a | 280 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 281 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 282 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
7c6db4e0 AS |
283 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
284 | if (force_poll || | |
285 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
286 | acpi_ec_wait(ec)) | |
287 | ret = ec_poll(ec); | |
3ebe08a7 | 288 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
289 | spin_lock_irqsave(&ec->curr_lock, tmp); |
290 | ec->curr = NULL; | |
291 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
292 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
293 | /* check if we received SCI during transaction */ | |
294 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
295 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 296 | acpi_enable_gpe(NULL, ec->gpe); |
7c6db4e0 | 297 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
8463200a | 298 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
299 | pr_info(PREFIX "GPE storm detected, " |
300 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
301 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
302 | } | |
303 | return ret; | |
304 | } | |
305 | ||
306 | static int ec_check_ibf0(struct acpi_ec *ec) | |
307 | { | |
308 | u8 status = acpi_ec_read_status(ec); | |
309 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
310 | } |
311 | ||
c0ff1772 AS |
312 | static int ec_wait_ibf0(struct acpi_ec *ec) |
313 | { | |
314 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
315 | /* interrupt wait manually if GPE mode is not active */ | |
316 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
317 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
318 | while (time_before(jiffies, delay)) | |
319 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
320 | return 0; | |
321 | return -ETIME; | |
45bea155 LY |
322 | } |
323 | ||
8463200a | 324 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 325 | int force_poll) |
1da177e4 | 326 | { |
d7a76e4c | 327 | int status; |
50526df6 | 328 | u32 glk; |
8463200a | 329 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 330 | return -EINVAL; |
8463200a AS |
331 | if (t->rdata) |
332 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 333 | mutex_lock(&ec->lock); |
703959d4 | 334 | if (ec->global_lock) { |
1da177e4 | 335 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 336 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
337 | status = -ENODEV; |
338 | goto unlock; | |
c24e912b | 339 | } |
1da177e4 | 340 | } |
c0ff1772 | 341 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
342 | pr_err(PREFIX "input buffer is not empty, " |
343 | "aborting transaction\n"); | |
7c6db4e0 | 344 | status = -ETIME; |
451566f4 | 345 | goto end; |
716e084e | 346 | } |
8463200a | 347 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 348 | end: |
703959d4 | 349 | if (ec->global_lock) |
1da177e4 | 350 | acpi_release_global_lock(glk); |
7c6db4e0 | 351 | unlock: |
523953b4 | 352 | mutex_unlock(&ec->lock); |
d550d98d | 353 | return status; |
1da177e4 LT |
354 | } |
355 | ||
c45aac43 AS |
356 | /* |
357 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
358 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
359 | */ | |
8a383ef0 | 360 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
361 | { |
362 | u8 d; | |
8463200a AS |
363 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
364 | .wdata = NULL, .rdata = &d, | |
365 | .wlen = 0, .rlen = 1}; | |
366 | ||
367 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
368 | } |
369 | ||
8a383ef0 | 370 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 371 | { |
8463200a AS |
372 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
373 | .wdata = NULL, .rdata = NULL, | |
374 | .wlen = 0, .rlen = 0}; | |
375 | ||
7c6db4e0 | 376 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 377 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
378 | } |
379 | ||
6ccedb10 | 380 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
381 | { |
382 | int result; | |
383 | u8 d; | |
8463200a AS |
384 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
385 | .wdata = &address, .rdata = &d, | |
386 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 387 | |
8463200a | 388 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
389 | *data = d; |
390 | return result; | |
391 | } | |
6ffb221a | 392 | |
3576cf61 DS |
393 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
394 | { | |
6ccedb10 | 395 | u8 wdata[2] = { address, data }; |
8463200a AS |
396 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
397 | .wdata = wdata, .rdata = NULL, | |
398 | .wlen = 2, .rlen = 0}; | |
399 | ||
400 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
401 | } |
402 | ||
1da177e4 LT |
403 | /* |
404 | * Externally callable EC access functions. For now, assume 1 EC only | |
405 | */ | |
c45aac43 AS |
406 | int ec_burst_enable(void) |
407 | { | |
c45aac43 AS |
408 | if (!first_ec) |
409 | return -ENODEV; | |
d033879c | 410 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
411 | } |
412 | ||
413 | EXPORT_SYMBOL(ec_burst_enable); | |
414 | ||
415 | int ec_burst_disable(void) | |
416 | { | |
c45aac43 AS |
417 | if (!first_ec) |
418 | return -ENODEV; | |
d033879c | 419 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
420 | } |
421 | ||
422 | EXPORT_SYMBOL(ec_burst_disable); | |
423 | ||
6ccedb10 | 424 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 425 | { |
1da177e4 | 426 | int err; |
6ffb221a | 427 | u8 temp_data; |
1da177e4 LT |
428 | |
429 | if (!first_ec) | |
430 | return -ENODEV; | |
431 | ||
d033879c | 432 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
433 | |
434 | if (!err) { | |
435 | *val = temp_data; | |
436 | return 0; | |
50526df6 | 437 | } else |
1da177e4 LT |
438 | return err; |
439 | } | |
50526df6 | 440 | |
1da177e4 LT |
441 | EXPORT_SYMBOL(ec_read); |
442 | ||
50526df6 | 443 | int ec_write(u8 addr, u8 val) |
1da177e4 | 444 | { |
1da177e4 LT |
445 | int err; |
446 | ||
447 | if (!first_ec) | |
448 | return -ENODEV; | |
449 | ||
d033879c | 450 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
451 | |
452 | return err; | |
453 | } | |
50526df6 | 454 | |
1da177e4 LT |
455 | EXPORT_SYMBOL(ec_write); |
456 | ||
616362de | 457 | int ec_transaction(u8 command, |
9e197219 | 458 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
459 | u8 * rdata, unsigned rdata_len, |
460 | int force_poll) | |
45bea155 | 461 | { |
8463200a AS |
462 | struct transaction t = {.command = command, |
463 | .wdata = wdata, .rdata = rdata, | |
464 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
465 | if (!first_ec) |
466 | return -ENODEV; | |
45bea155 | 467 | |
8463200a | 468 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 469 | } |
1da177e4 | 470 | |
ab9e43c6 LP |
471 | EXPORT_SYMBOL(ec_transaction); |
472 | ||
6ccedb10 | 473 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
474 | { |
475 | int result; | |
6ccedb10 | 476 | u8 d; |
8463200a AS |
477 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
478 | .wdata = NULL, .rdata = &d, | |
479 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
480 | if (!ec || !data) |
481 | return -EINVAL; | |
1da177e4 | 482 | |
6ccedb10 AS |
483 | /* |
484 | * Query the EC to find out which _Qxx method we need to evaluate. | |
485 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
486 | * bit to be cleared (and thus clearing the interrupt source). | |
487 | */ | |
716e084e | 488 | |
8463200a | 489 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
490 | if (result) |
491 | return result; | |
1da177e4 | 492 | |
6ccedb10 AS |
493 | if (!d) |
494 | return -ENODATA; | |
1da177e4 | 495 | |
6ccedb10 AS |
496 | *data = d; |
497 | return 0; | |
1da177e4 LT |
498 | } |
499 | ||
1da177e4 LT |
500 | /* -------------------------------------------------------------------------- |
501 | Event Management | |
502 | -------------------------------------------------------------------------- */ | |
837012ed AS |
503 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
504 | acpi_handle handle, acpi_ec_query_func func, | |
505 | void *data) | |
506 | { | |
507 | struct acpi_ec_query_handler *handler = | |
508 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
509 | if (!handler) | |
510 | return -ENOMEM; | |
511 | ||
512 | handler->query_bit = query_bit; | |
513 | handler->handle = handle; | |
514 | handler->func = func; | |
515 | handler->data = data; | |
516 | mutex_lock(&ec->lock); | |
30c08574 | 517 | list_add(&handler->node, &ec->list); |
837012ed AS |
518 | mutex_unlock(&ec->lock); |
519 | return 0; | |
520 | } | |
521 | ||
522 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
523 | ||
524 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
525 | { | |
1544fdbc | 526 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 527 | mutex_lock(&ec->lock); |
1544fdbc | 528 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
529 | if (query_bit == handler->query_bit) { |
530 | list_del(&handler->node); | |
531 | kfree(handler); | |
837012ed AS |
532 | } |
533 | } | |
534 | mutex_unlock(&ec->lock); | |
535 | } | |
536 | ||
537 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 538 | |
50526df6 | 539 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 540 | { |
3d02b90b | 541 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 542 | u8 value = 0; |
837012ed | 543 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 544 | |
5d0c288b | 545 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 546 | return; |
837012ed AS |
547 | mutex_lock(&ec->lock); |
548 | list_for_each_entry(handler, &ec->list, node) { | |
549 | if (value == handler->query_bit) { | |
550 | /* have custom handler for this bit */ | |
551 | memcpy(©, handler, sizeof(copy)); | |
552 | mutex_unlock(&ec->lock); | |
553 | if (copy.func) { | |
554 | copy.func(copy.data); | |
555 | } else if (copy.handle) { | |
556 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
557 | } | |
558 | return; | |
559 | } | |
560 | } | |
561 | mutex_unlock(&ec->lock); | |
45bea155 | 562 | } |
1da177e4 | 563 | |
50526df6 | 564 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 565 | { |
3d02b90b | 566 | struct acpi_ec *ec = data; |
7c6db4e0 | 567 | u8 status; |
00eb43a1 | 568 | |
3ebe08a7 | 569 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
570 | status = acpi_ec_read_status(ec); |
571 | ||
8517934e AS |
572 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) { |
573 | gpe_transaction(ec, status); | |
574 | if (ec_transaction_done(ec) && | |
575 | (status & ACPI_EC_FLAG_IBF) == 0) | |
576 | wake_up(&ec->wait); | |
577 | } | |
451566f4 | 578 | |
7c6db4e0 AS |
579 | ec_check_sci(ec, status); |
580 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
581 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 582 | /* this is non-query, must be confirmation */ |
f8248434 AJ |
583 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
584 | if (printk_ratelimit()) | |
585 | pr_info(PREFIX "non-query interrupt received," | |
586 | " switching to interrupt mode\n"); | |
587 | } else { | |
588 | /* hush, STORM switches the mode every transaction */ | |
589 | pr_debug(PREFIX "non-query interrupt received," | |
3ebe08a7 | 590 | " switching to interrupt mode\n"); |
f8248434 | 591 | } |
7843932a | 592 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 593 | } |
7c6db4e0 | 594 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
595 | } |
596 | ||
1da177e4 LT |
597 | /* -------------------------------------------------------------------------- |
598 | Address Space Management | |
599 | -------------------------------------------------------------------------- */ | |
600 | ||
1da177e4 | 601 | static acpi_status |
5b7734b4 AS |
602 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
603 | u32 bits, acpi_integer *value, | |
50526df6 | 604 | void *handler_context, void *region_context) |
1da177e4 | 605 | { |
3d02b90b | 606 | struct acpi_ec *ec = handler_context; |
3e71a87d | 607 | int result = 0, i; |
5b7734b4 | 608 | u8 temp = 0; |
1da177e4 | 609 | |
1da177e4 | 610 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 611 | return AE_BAD_PARAMETER; |
1da177e4 | 612 | |
5b7734b4 | 613 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 614 | return AE_BAD_PARAMETER; |
1da177e4 | 615 | |
5b7734b4 AS |
616 | if (bits != 8 && acpi_strict) |
617 | return AE_BAD_PARAMETER; | |
1da177e4 | 618 | |
b3b233c7 AS |
619 | acpi_ec_burst_enable(ec); |
620 | ||
3e71a87d AS |
621 | if (function == ACPI_READ) { |
622 | result = acpi_ec_read(ec, address, &temp); | |
623 | *value = temp; | |
624 | } else { | |
625 | temp = 0xff & (*value); | |
626 | result = acpi_ec_write(ec, address, temp); | |
627 | } | |
628 | ||
629 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
630 | ++address; | |
5b7734b4 AS |
631 | if (function == ACPI_READ) { |
632 | result = acpi_ec_read(ec, address, &temp); | |
633 | (*value) |= ((acpi_integer)temp) << i; | |
634 | } else { | |
635 | temp = 0xff & ((*value) >> i); | |
636 | result = acpi_ec_write(ec, address, temp); | |
637 | } | |
1da177e4 LT |
638 | } |
639 | ||
b3b233c7 AS |
640 | acpi_ec_burst_disable(ec); |
641 | ||
1da177e4 LT |
642 | switch (result) { |
643 | case -EINVAL: | |
d550d98d | 644 | return AE_BAD_PARAMETER; |
1da177e4 LT |
645 | break; |
646 | case -ENODEV: | |
d550d98d | 647 | return AE_NOT_FOUND; |
1da177e4 LT |
648 | break; |
649 | case -ETIME: | |
d550d98d | 650 | return AE_TIME; |
1da177e4 LT |
651 | break; |
652 | default: | |
d550d98d | 653 | return AE_OK; |
1da177e4 | 654 | } |
1da177e4 LT |
655 | } |
656 | ||
1da177e4 LT |
657 | /* -------------------------------------------------------------------------- |
658 | FS Interface (/proc) | |
659 | -------------------------------------------------------------------------- */ | |
660 | ||
50526df6 | 661 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 662 | |
50526df6 | 663 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 664 | { |
3d02b90b | 665 | struct acpi_ec *ec = seq->private; |
1da177e4 | 666 | |
1da177e4 LT |
667 | if (!ec) |
668 | goto end; | |
669 | ||
01f22462 AS |
670 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
671 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
672 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
673 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 674 | ec->global_lock ? "yes" : "no"); |
50526df6 | 675 | end: |
d550d98d | 676 | return 0; |
1da177e4 LT |
677 | } |
678 | ||
679 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
680 | { | |
681 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
682 | } | |
683 | ||
070d8eb1 | 684 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
685 | .open = acpi_ec_info_open_fs, |
686 | .read = seq_read, | |
687 | .llseek = seq_lseek, | |
688 | .release = single_release, | |
1da177e4 LT |
689 | .owner = THIS_MODULE, |
690 | }; | |
691 | ||
50526df6 | 692 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 693 | { |
50526df6 | 694 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 695 | |
1da177e4 LT |
696 | if (!acpi_device_dir(device)) { |
697 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 698 | acpi_ec_dir); |
1da177e4 | 699 | if (!acpi_device_dir(device)) |
d550d98d | 700 | return -ENODEV; |
1da177e4 LT |
701 | } |
702 | ||
cf7acfab DL |
703 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
704 | acpi_device_dir(device), | |
705 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 706 | if (!entry) |
d550d98d | 707 | return -ENODEV; |
d550d98d | 708 | return 0; |
1da177e4 LT |
709 | } |
710 | ||
50526df6 | 711 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 712 | { |
1da177e4 LT |
713 | |
714 | if (acpi_device_dir(device)) { | |
715 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
716 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
717 | acpi_device_dir(device) = NULL; | |
718 | } | |
719 | ||
d550d98d | 720 | return 0; |
1da177e4 LT |
721 | } |
722 | ||
1da177e4 LT |
723 | /* -------------------------------------------------------------------------- |
724 | Driver Interface | |
725 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
726 | static acpi_status |
727 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
728 | ||
c0900c35 AS |
729 | static struct acpi_ec *make_acpi_ec(void) |
730 | { | |
731 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
732 | if (!ec) | |
733 | return NULL; | |
080e412c | 734 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
735 | mutex_init(&ec->lock); |
736 | init_waitqueue_head(&ec->wait); | |
837012ed | 737 | INIT_LIST_HEAD(&ec->list); |
8463200a | 738 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
739 | return ec; |
740 | } | |
837012ed | 741 | |
c019b193 AS |
742 | static acpi_status |
743 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
744 | void *context, void **return_value) | |
745 | { | |
0175d562 LM |
746 | char node_name[5]; |
747 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
748 | struct acpi_ec *ec = context; |
749 | int value = 0; | |
0175d562 LM |
750 | acpi_status status; |
751 | ||
752 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
753 | ||
754 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
755 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
756 | } | |
757 | return AE_OK; | |
758 | } | |
759 | ||
cd8c93a4 AS |
760 | static acpi_status |
761 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 762 | { |
cd8c93a4 | 763 | acpi_status status; |
d21cf3c1 | 764 | unsigned long long tmp = 0; |
cd8c93a4 AS |
765 | |
766 | struct acpi_ec *ec = context; | |
a5032bfd AS |
767 | |
768 | /* clear addr values, ec_parse_io_ports depend on it */ | |
769 | ec->command_addr = ec->data_addr = 0; | |
770 | ||
cd8c93a4 AS |
771 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
772 | ec_parse_io_ports, ec); | |
773 | if (ACPI_FAILURE(status)) | |
774 | return status; | |
837012ed AS |
775 | |
776 | /* Get GPE bit assignment (EC events). */ | |
777 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 778 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
779 | if (ACPI_FAILURE(status)) |
780 | return status; | |
27663c58 | 781 | ec->gpe = tmp; |
837012ed | 782 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 783 | tmp = 0; |
27663c58 MW |
784 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
785 | ec->global_lock = tmp; | |
837012ed | 786 | ec->handle = handle; |
cd8c93a4 | 787 | return AE_CTRL_TERMINATE; |
837012ed AS |
788 | } |
789 | ||
5efc5476 BH |
790 | static int ec_install_handlers(struct acpi_ec *ec) |
791 | { | |
792 | acpi_status status; | |
793 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
794 | return 0; | |
795 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
796 | ACPI_GPE_EDGE_TRIGGERED, | |
797 | &acpi_ec_gpe_handler, ec); | |
798 | if (ACPI_FAILURE(status)) | |
799 | return -ENODEV; | |
800 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
801 | acpi_enable_gpe(NULL, ec->gpe); | |
802 | status = acpi_install_address_space_handler(ec->handle, | |
803 | ACPI_ADR_SPACE_EC, | |
804 | &acpi_ec_space_handler, | |
805 | NULL, ec); | |
806 | if (ACPI_FAILURE(status)) { | |
807 | if (status == AE_NOT_FOUND) { | |
808 | /* | |
809 | * Maybe OS fails in evaluating the _REG object. | |
810 | * The AE_NOT_FOUND error will be ignored and OS | |
811 | * continue to initialize EC. | |
812 | */ | |
813 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
814 | " of EC device. Broken bios is suspected.\n"); | |
815 | } else { | |
816 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
817 | &acpi_ec_gpe_handler); | |
818 | return -ENODEV; | |
819 | } | |
820 | } | |
821 | ||
822 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
823 | return 0; | |
824 | } | |
825 | ||
4c611060 AS |
826 | static void ec_remove_handlers(struct acpi_ec *ec) |
827 | { | |
828 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
829 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 830 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
831 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
832 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 833 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 834 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
835 | } |
836 | ||
703959d4 | 837 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 838 | { |
703959d4 | 839 | struct acpi_ec *ec = NULL; |
d02be047 | 840 | int ret; |
45bea155 | 841 | |
c0900c35 AS |
842 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
843 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
844 | ||
4c611060 | 845 | /* Check for boot EC */ |
ce52ddf5 AS |
846 | if (boot_ec && |
847 | (boot_ec->handle == device->handle || | |
848 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
849 | ec = boot_ec; | |
850 | boot_ec = NULL; | |
851 | } else { | |
852 | ec = make_acpi_ec(); | |
853 | if (!ec) | |
854 | return -ENOMEM; | |
a5032bfd AS |
855 | } |
856 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
857 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
858 | kfree(ec); |
859 | return -EINVAL; | |
4c611060 AS |
860 | } |
861 | ||
c0900c35 | 862 | ec->handle = device->handle; |
ce52ddf5 AS |
863 | |
864 | /* Find and register all query methods */ | |
865 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
866 | acpi_ec_register_query_methods, ec, NULL); | |
867 | ||
4c611060 AS |
868 | if (!first_ec) |
869 | first_ec = ec; | |
db89b4f0 | 870 | device->driver_data = ec; |
c0900c35 | 871 | acpi_ec_add_fs(device); |
3ebe08a7 | 872 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 873 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 874 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 875 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
5efc5476 BH |
876 | |
877 | ret = ec_install_handlers(ec); | |
878 | ||
879 | /* EC is fully operational, allow queries */ | |
880 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
881 | return ret; | |
1da177e4 LT |
882 | } |
883 | ||
50526df6 | 884 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 885 | { |
01f22462 | 886 | struct acpi_ec *ec; |
07ddf768 | 887 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 888 | |
1da177e4 | 889 | if (!device) |
d550d98d | 890 | return -EINVAL; |
1da177e4 LT |
891 | |
892 | ec = acpi_driver_data(device); | |
cf745ec7 | 893 | ec_remove_handlers(ec); |
837012ed | 894 | mutex_lock(&ec->lock); |
07ddf768 | 895 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
896 | list_del(&handler->node); |
897 | kfree(handler); | |
898 | } | |
899 | mutex_unlock(&ec->lock); | |
1da177e4 | 900 | acpi_ec_remove_fs(device); |
db89b4f0 | 901 | device->driver_data = NULL; |
d033879c | 902 | if (ec == first_ec) |
c0900c35 | 903 | first_ec = NULL; |
4c611060 | 904 | kfree(ec); |
d550d98d | 905 | return 0; |
1da177e4 LT |
906 | } |
907 | ||
1da177e4 | 908 | static acpi_status |
c0900c35 | 909 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 910 | { |
3d02b90b | 911 | struct acpi_ec *ec = context; |
1da177e4 | 912 | |
01f22462 | 913 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 914 | return AE_OK; |
1da177e4 LT |
915 | |
916 | /* | |
917 | * The first address region returned is the data port, and | |
918 | * the second address region returned is the status/command | |
919 | * port. | |
920 | */ | |
01f22462 | 921 | if (ec->data_addr == 0) |
6ffb221a | 922 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 923 | else if (ec->command_addr == 0) |
6ffb221a | 924 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 925 | else |
1da177e4 | 926 | return AE_CTRL_TERMINATE; |
1da177e4 | 927 | |
1da177e4 LT |
928 | return AE_OK; |
929 | } | |
930 | ||
c04209a7 AS |
931 | int __init acpi_boot_ec_enable(void) |
932 | { | |
7c6db4e0 | 933 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
934 | return 0; |
935 | if (!ec_install_handlers(boot_ec)) { | |
936 | first_ec = boot_ec; | |
937 | return 0; | |
938 | } | |
939 | return -EFAULT; | |
940 | } | |
941 | ||
223883b7 AS |
942 | static const struct acpi_device_id ec_device_ids[] = { |
943 | {"PNP0C09", 0}, | |
944 | {"", 0}, | |
945 | }; | |
946 | ||
c0900c35 AS |
947 | int __init acpi_ec_ecdt_probe(void) |
948 | { | |
c0900c35 | 949 | acpi_status status; |
c6cb0e87 | 950 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 951 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 952 | |
d66d969d AS |
953 | boot_ec = make_acpi_ec(); |
954 | if (!boot_ec) | |
c0900c35 AS |
955 | return -ENOMEM; |
956 | /* | |
957 | * Generate a boot ec context | |
958 | */ | |
5423a0cb AS |
959 | if (dmi_name_in_vendors("Micro-Star") || |
960 | dmi_name_in_vendors("Notebook")) { | |
961 | pr_info(PREFIX "Enabling special treatment for EC from MSI.\n"); | |
962 | EC_FLAGS_MSI = 1; | |
963 | } | |
15a58ed1 AS |
964 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
965 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 966 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 967 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
968 | boot_ec->command_addr = ecdt_ptr->control.address; |
969 | boot_ec->data_addr = ecdt_ptr->data.address; | |
970 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 971 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 972 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 973 | /* Don't trust ECDT, which comes from ASUSTek */ |
a5032bfd | 974 | if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0) |
c5279dee | 975 | goto install; |
c6cb0e87 AS |
976 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
977 | if (!saved_ec) | |
978 | return -ENOMEM; | |
a5032bfd | 979 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 980 | /* fall through */ |
cd8c93a4 | 981 | } |
c5279dee AS |
982 | /* This workaround is needed only on some broken machines, |
983 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
984 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
985 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
986 | boot_ec, NULL); | |
987 | /* Check that acpi_get_devices actually find something */ | |
988 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
989 | goto error; | |
c6cb0e87 AS |
990 | if (saved_ec) { |
991 | /* try to find good ECDT from ASUSTek */ | |
992 | if (saved_ec->command_addr != boot_ec->command_addr || | |
993 | saved_ec->data_addr != boot_ec->data_addr || | |
994 | saved_ec->gpe != boot_ec->gpe || | |
995 | saved_ec->handle != boot_ec->handle) | |
996 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
997 | "ECDT tables, which are very hard to workaround. " | |
998 | "Trying to use DSDT EC info instead. Please send " | |
999 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1000 | kfree(saved_ec); | |
1001 | saved_ec = NULL; | |
1002 | } else { | |
1003 | /* We really need to limit this workaround, the only ASUS, | |
1004 | * which needs it, has fake EC._INI method, so use it as flag. | |
1005 | * Keep boot_ec struct as it will be needed soon. | |
1006 | */ | |
1007 | acpi_handle dummy; | |
1008 | if (!dmi_name_in_vendors("ASUS") || | |
1009 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1010 | &dummy))) | |
1011 | return -ENODEV; | |
1012 | } | |
c5279dee AS |
1013 | install: |
1014 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1015 | first_ec = boot_ec; |
e8284321 | 1016 | return 0; |
d033879c | 1017 | } |
c5279dee | 1018 | error: |
d66d969d AS |
1019 | kfree(boot_ec); |
1020 | boot_ec = NULL; | |
1da177e4 LT |
1021 | return -ENODEV; |
1022 | } | |
1023 | ||
223883b7 AS |
1024 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1025 | { | |
1026 | struct acpi_ec *ec = acpi_driver_data(device); | |
1027 | /* Stop using GPE */ | |
1028 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1029 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 1030 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1031 | return 0; |
1032 | } | |
1033 | ||
1034 | static int acpi_ec_resume(struct acpi_device *device) | |
1035 | { | |
1036 | struct acpi_ec *ec = acpi_driver_data(device); | |
1037 | /* Enable use of GPE back */ | |
1038 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
5aa63f03 | 1039 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
0b7084ac | 1040 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1041 | return 0; |
1042 | } | |
1043 | ||
1044 | static struct acpi_driver acpi_ec_driver = { | |
1045 | .name = "ec", | |
1046 | .class = ACPI_EC_CLASS, | |
1047 | .ids = ec_device_ids, | |
1048 | .ops = { | |
1049 | .add = acpi_ec_add, | |
1050 | .remove = acpi_ec_remove, | |
223883b7 AS |
1051 | .suspend = acpi_ec_suspend, |
1052 | .resume = acpi_ec_resume, | |
1053 | }, | |
1054 | }; | |
1055 | ||
a5f820fe | 1056 | int __init acpi_ec_init(void) |
1da177e4 | 1057 | { |
50526df6 | 1058 | int result = 0; |
1da177e4 | 1059 | |
1da177e4 LT |
1060 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1061 | if (!acpi_ec_dir) | |
d550d98d | 1062 | return -ENODEV; |
1da177e4 LT |
1063 | |
1064 | /* Now register the driver for the EC */ | |
1065 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1066 | if (result < 0) { | |
1067 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1068 | return -ENODEV; |
1da177e4 LT |
1069 | } |
1070 | ||
d550d98d | 1071 | return result; |
1da177e4 LT |
1072 | } |
1073 | ||
1da177e4 LT |
1074 | /* EC driver currently not unloadable */ |
1075 | #if 0 | |
50526df6 | 1076 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1077 | { |
1da177e4 LT |
1078 | |
1079 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1080 | ||
1081 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1082 | ||
d550d98d | 1083 | return; |
1da177e4 | 1084 | } |
7843932a | 1085 | #endif /* 0 */ |