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> | |
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 AS |
50 | #undef PREFIX |
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 */ |
e6e82a30 | 70 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
703959d4 | 71 | |
06cf7d3c | 72 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
73 | per one transaction */ |
74 | ||
080e412c | 75 | enum { |
080e412c | 76 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
77 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
78 | * for status change */ | |
b77d81b2 | 79 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
7c6db4e0 AS |
80 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
81 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
82 | * OpReg are installed */ | |
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 | |
1da177e4 LT |
123 | /* -------------------------------------------------------------------------- |
124 | Transaction Management | |
125 | -------------------------------------------------------------------------- */ | |
126 | ||
6ffb221a | 127 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 128 | { |
3ebe08a7 | 129 | u8 x = inb(ec->command_addr); |
86dae015 | 130 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 131 | return x; |
451566f4 DT |
132 | } |
133 | ||
6ffb221a | 134 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 135 | { |
3ebe08a7 | 136 | u8 x = inb(ec->data_addr); |
86dae015 | 137 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 138 | return x; |
7c6db5e5 DS |
139 | } |
140 | ||
6ffb221a | 141 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 142 | { |
86dae015 | 143 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 144 | outb(command, ec->command_addr); |
45bea155 LY |
145 | } |
146 | ||
6ffb221a | 147 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 148 | { |
86dae015 | 149 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 150 | outb(data, ec->data_addr); |
703959d4 | 151 | } |
45bea155 | 152 | |
7c6db4e0 | 153 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 154 | { |
7c6db4e0 AS |
155 | unsigned long flags; |
156 | int ret = 0; | |
8463200a | 157 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 158 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 159 | ret = 1; |
8463200a | 160 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 161 | return ret; |
45bea155 | 162 | } |
451566f4 | 163 | |
a2f93aea AS |
164 | static void start_transaction(struct acpi_ec *ec) |
165 | { | |
166 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
167 | ec->curr->done = false; | |
168 | acpi_ec_write_cmd(ec, ec->curr->command); | |
169 | } | |
170 | ||
7c6db4e0 | 171 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 172 | { |
7c6db4e0 | 173 | unsigned long flags; |
8463200a AS |
174 | spin_lock_irqsave(&ec->curr_lock, flags); |
175 | if (!ec->curr) | |
7c6db4e0 | 176 | goto unlock; |
a2f93aea AS |
177 | if (ec->curr->wlen > ec->curr->wi) { |
178 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
179 | acpi_ec_write_data(ec, | |
180 | ec->curr->wdata[ec->curr->wi++]); | |
181 | else | |
dd15f8c4 | 182 | goto err; |
a2f93aea | 183 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 184 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
185 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
186 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 187 | ec->curr->done = true; |
7c6db4e0 | 188 | } else |
dd15f8c4 | 189 | goto err; |
a2f93aea AS |
190 | } else if (ec->curr->wlen == ec->curr->wi && |
191 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
192 | ec->curr->done = true; |
193 | goto unlock; | |
194 | err: | |
195 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
196 | if (in_interrupt()) |
197 | ++ec->curr->irq_count; | |
7c6db4e0 | 198 | unlock: |
8463200a | 199 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 200 | } |
03d1d99c | 201 | |
7c6db4e0 | 202 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 203 | { |
7c6db4e0 AS |
204 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
205 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
206 | return 0; | |
a2f93aea AS |
207 | /* try restart command if we get any false interrupts */ |
208 | if (ec->curr->irq_count && | |
209 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
210 | pr_debug(PREFIX "controller reset, restart transaction\n"); | |
211 | start_transaction(ec); | |
212 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), | |
213 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
214 | return 0; | |
215 | } | |
7c6db4e0 AS |
216 | /* missing GPEs, switch back to poll mode */ |
217 | if (printk_ratelimit()) | |
218 | pr_info(PREFIX "missing confirmations, " | |
219 | "switch off interrupt mode.\n"); | |
b77d81b2 | 220 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd | 221 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
7c6db4e0 | 222 | return 1; |
845625cd AS |
223 | } |
224 | ||
7c6db4e0 AS |
225 | static void acpi_ec_gpe_query(void *ec_cxt); |
226 | ||
227 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 228 | { |
7c6db4e0 AS |
229 | if (state & ACPI_EC_FLAG_SCI) { |
230 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
231 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
232 | acpi_ec_gpe_query, ec); | |
233 | } | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static int ec_poll(struct acpi_ec *ec) | |
238 | { | |
239 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
1cfe62c8 | 240 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 AS |
241 | while (time_before(jiffies, delay)) { |
242 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
1cfe62c8 | 243 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 | 244 | if (ec_transaction_done(ec)) |
9d699ed9 | 245 | return 0; |
af3fd140 | 246 | } |
b77d81b2 | 247 | return -ETIME; |
1da177e4 LT |
248 | } |
249 | ||
8463200a AS |
250 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
251 | struct transaction *t, | |
00eb43a1 | 252 | int force_poll) |
45bea155 | 253 | { |
7c6db4e0 | 254 | unsigned long tmp; |
7c6db4e0 | 255 | int ret = 0; |
3ebe08a7 | 256 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
257 | /* disable GPE during transaction if storm is detected */ |
258 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
259 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 260 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 261 | } |
7c6db4e0 | 262 | /* start transaction */ |
8463200a | 263 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 264 | /* following two actions should be kept atomic */ |
8463200a | 265 | ec->curr = t; |
a2f93aea | 266 | start_transaction(ec); |
8463200a | 267 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 268 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 269 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
7c6db4e0 AS |
270 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
271 | if (force_poll || | |
272 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
273 | acpi_ec_wait(ec)) | |
274 | ret = ec_poll(ec); | |
3ebe08a7 | 275 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
276 | spin_lock_irqsave(&ec->curr_lock, tmp); |
277 | ec->curr = NULL; | |
278 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
279 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
280 | /* check if we received SCI during transaction */ | |
281 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
282 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 283 | acpi_enable_gpe(NULL, ec->gpe); |
7c6db4e0 | 284 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
8463200a | 285 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
286 | pr_info(PREFIX "GPE storm detected, " |
287 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
288 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
289 | } | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static int ec_check_ibf0(struct acpi_ec *ec) | |
294 | { | |
295 | u8 status = acpi_ec_read_status(ec); | |
296 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
297 | } |
298 | ||
c0ff1772 AS |
299 | static int ec_wait_ibf0(struct acpi_ec *ec) |
300 | { | |
301 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
302 | /* interrupt wait manually if GPE mode is not active */ | |
303 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
304 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
305 | while (time_before(jiffies, delay)) | |
306 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
307 | return 0; | |
308 | return -ETIME; | |
45bea155 LY |
309 | } |
310 | ||
8463200a | 311 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 312 | int force_poll) |
1da177e4 | 313 | { |
d7a76e4c | 314 | int status; |
50526df6 | 315 | u32 glk; |
8463200a | 316 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 317 | return -EINVAL; |
8463200a AS |
318 | if (t->rdata) |
319 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 320 | mutex_lock(&ec->lock); |
703959d4 | 321 | if (ec->global_lock) { |
1da177e4 | 322 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 323 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
324 | status = -ENODEV; |
325 | goto unlock; | |
c24e912b | 326 | } |
1da177e4 | 327 | } |
c0ff1772 | 328 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
329 | pr_err(PREFIX "input buffer is not empty, " |
330 | "aborting transaction\n"); | |
7c6db4e0 | 331 | status = -ETIME; |
451566f4 | 332 | goto end; |
716e084e | 333 | } |
8463200a | 334 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 335 | end: |
703959d4 | 336 | if (ec->global_lock) |
1da177e4 | 337 | acpi_release_global_lock(glk); |
7c6db4e0 | 338 | unlock: |
523953b4 | 339 | mutex_unlock(&ec->lock); |
d550d98d | 340 | return status; |
1da177e4 LT |
341 | } |
342 | ||
c45aac43 AS |
343 | /* |
344 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
345 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
346 | */ | |
8a383ef0 | 347 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
348 | { |
349 | u8 d; | |
8463200a AS |
350 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
351 | .wdata = NULL, .rdata = &d, | |
352 | .wlen = 0, .rlen = 1}; | |
353 | ||
354 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
355 | } |
356 | ||
8a383ef0 | 357 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 358 | { |
8463200a AS |
359 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
360 | .wdata = NULL, .rdata = NULL, | |
361 | .wlen = 0, .rlen = 0}; | |
362 | ||
7c6db4e0 | 363 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 364 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
365 | } |
366 | ||
6ccedb10 | 367 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
368 | { |
369 | int result; | |
370 | u8 d; | |
8463200a AS |
371 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
372 | .wdata = &address, .rdata = &d, | |
373 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 374 | |
8463200a | 375 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
376 | *data = d; |
377 | return result; | |
378 | } | |
6ffb221a | 379 | |
3576cf61 DS |
380 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
381 | { | |
6ccedb10 | 382 | u8 wdata[2] = { address, data }; |
8463200a AS |
383 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
384 | .wdata = wdata, .rdata = NULL, | |
385 | .wlen = 2, .rlen = 0}; | |
386 | ||
387 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
388 | } |
389 | ||
1da177e4 LT |
390 | /* |
391 | * Externally callable EC access functions. For now, assume 1 EC only | |
392 | */ | |
c45aac43 AS |
393 | int ec_burst_enable(void) |
394 | { | |
c45aac43 AS |
395 | if (!first_ec) |
396 | return -ENODEV; | |
d033879c | 397 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
398 | } |
399 | ||
400 | EXPORT_SYMBOL(ec_burst_enable); | |
401 | ||
402 | int ec_burst_disable(void) | |
403 | { | |
c45aac43 AS |
404 | if (!first_ec) |
405 | return -ENODEV; | |
d033879c | 406 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
407 | } |
408 | ||
409 | EXPORT_SYMBOL(ec_burst_disable); | |
410 | ||
6ccedb10 | 411 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 412 | { |
1da177e4 | 413 | int err; |
6ffb221a | 414 | u8 temp_data; |
1da177e4 LT |
415 | |
416 | if (!first_ec) | |
417 | return -ENODEV; | |
418 | ||
d033879c | 419 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
420 | |
421 | if (!err) { | |
422 | *val = temp_data; | |
423 | return 0; | |
50526df6 | 424 | } else |
1da177e4 LT |
425 | return err; |
426 | } | |
50526df6 | 427 | |
1da177e4 LT |
428 | EXPORT_SYMBOL(ec_read); |
429 | ||
50526df6 | 430 | int ec_write(u8 addr, u8 val) |
1da177e4 | 431 | { |
1da177e4 LT |
432 | int err; |
433 | ||
434 | if (!first_ec) | |
435 | return -ENODEV; | |
436 | ||
d033879c | 437 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
438 | |
439 | return err; | |
440 | } | |
50526df6 | 441 | |
1da177e4 LT |
442 | EXPORT_SYMBOL(ec_write); |
443 | ||
616362de | 444 | int ec_transaction(u8 command, |
9e197219 | 445 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
446 | u8 * rdata, unsigned rdata_len, |
447 | int force_poll) | |
45bea155 | 448 | { |
8463200a AS |
449 | struct transaction t = {.command = command, |
450 | .wdata = wdata, .rdata = rdata, | |
451 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
452 | if (!first_ec) |
453 | return -ENODEV; | |
45bea155 | 454 | |
8463200a | 455 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 456 | } |
1da177e4 | 457 | |
ab9e43c6 LP |
458 | EXPORT_SYMBOL(ec_transaction); |
459 | ||
6ccedb10 | 460 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
461 | { |
462 | int result; | |
6ccedb10 | 463 | u8 d; |
8463200a AS |
464 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
465 | .wdata = NULL, .rdata = &d, | |
466 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
467 | if (!ec || !data) |
468 | return -EINVAL; | |
1da177e4 | 469 | |
6ccedb10 AS |
470 | /* |
471 | * Query the EC to find out which _Qxx method we need to evaluate. | |
472 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
473 | * bit to be cleared (and thus clearing the interrupt source). | |
474 | */ | |
716e084e | 475 | |
8463200a | 476 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
477 | if (result) |
478 | return result; | |
1da177e4 | 479 | |
6ccedb10 AS |
480 | if (!d) |
481 | return -ENODATA; | |
1da177e4 | 482 | |
6ccedb10 AS |
483 | *data = d; |
484 | return 0; | |
1da177e4 LT |
485 | } |
486 | ||
1da177e4 LT |
487 | /* -------------------------------------------------------------------------- |
488 | Event Management | |
489 | -------------------------------------------------------------------------- */ | |
837012ed AS |
490 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
491 | acpi_handle handle, acpi_ec_query_func func, | |
492 | void *data) | |
493 | { | |
494 | struct acpi_ec_query_handler *handler = | |
495 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
496 | if (!handler) | |
497 | return -ENOMEM; | |
498 | ||
499 | handler->query_bit = query_bit; | |
500 | handler->handle = handle; | |
501 | handler->func = func; | |
502 | handler->data = data; | |
503 | mutex_lock(&ec->lock); | |
30c08574 | 504 | list_add(&handler->node, &ec->list); |
837012ed AS |
505 | mutex_unlock(&ec->lock); |
506 | return 0; | |
507 | } | |
508 | ||
509 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
510 | ||
511 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
512 | { | |
1544fdbc | 513 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 514 | mutex_lock(&ec->lock); |
1544fdbc | 515 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
516 | if (query_bit == handler->query_bit) { |
517 | list_del(&handler->node); | |
518 | kfree(handler); | |
837012ed AS |
519 | } |
520 | } | |
521 | mutex_unlock(&ec->lock); | |
522 | } | |
523 | ||
524 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 525 | |
50526df6 | 526 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 527 | { |
3d02b90b | 528 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 529 | u8 value = 0; |
837012ed | 530 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 531 | |
5d0c288b | 532 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 533 | return; |
837012ed AS |
534 | mutex_lock(&ec->lock); |
535 | list_for_each_entry(handler, &ec->list, node) { | |
536 | if (value == handler->query_bit) { | |
537 | /* have custom handler for this bit */ | |
538 | memcpy(©, handler, sizeof(copy)); | |
539 | mutex_unlock(&ec->lock); | |
540 | if (copy.func) { | |
541 | copy.func(copy.data); | |
542 | } else if (copy.handle) { | |
543 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
544 | } | |
545 | return; | |
546 | } | |
547 | } | |
548 | mutex_unlock(&ec->lock); | |
45bea155 | 549 | } |
1da177e4 | 550 | |
50526df6 | 551 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 552 | { |
3d02b90b | 553 | struct acpi_ec *ec = data; |
7c6db4e0 | 554 | u8 status; |
00eb43a1 | 555 | |
3ebe08a7 | 556 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
557 | status = acpi_ec_read_status(ec); |
558 | ||
8517934e AS |
559 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) { |
560 | gpe_transaction(ec, status); | |
561 | if (ec_transaction_done(ec) && | |
562 | (status & ACPI_EC_FLAG_IBF) == 0) | |
563 | wake_up(&ec->wait); | |
564 | } | |
451566f4 | 565 | |
7c6db4e0 AS |
566 | ec_check_sci(ec, status); |
567 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
568 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 569 | /* this is non-query, must be confirmation */ |
f8248434 AJ |
570 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
571 | if (printk_ratelimit()) | |
572 | pr_info(PREFIX "non-query interrupt received," | |
573 | " switching to interrupt mode\n"); | |
574 | } else { | |
575 | /* hush, STORM switches the mode every transaction */ | |
576 | pr_debug(PREFIX "non-query interrupt received," | |
3ebe08a7 | 577 | " switching to interrupt mode\n"); |
f8248434 | 578 | } |
7843932a | 579 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 580 | } |
7c6db4e0 | 581 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
582 | } |
583 | ||
1da177e4 LT |
584 | /* -------------------------------------------------------------------------- |
585 | Address Space Management | |
586 | -------------------------------------------------------------------------- */ | |
587 | ||
1da177e4 | 588 | static acpi_status |
5b7734b4 AS |
589 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
590 | u32 bits, acpi_integer *value, | |
50526df6 | 591 | void *handler_context, void *region_context) |
1da177e4 | 592 | { |
3d02b90b | 593 | struct acpi_ec *ec = handler_context; |
3e71a87d | 594 | int result = 0, i; |
5b7734b4 | 595 | u8 temp = 0; |
1da177e4 | 596 | |
1da177e4 | 597 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 598 | return AE_BAD_PARAMETER; |
1da177e4 | 599 | |
5b7734b4 | 600 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 601 | return AE_BAD_PARAMETER; |
1da177e4 | 602 | |
5b7734b4 AS |
603 | if (bits != 8 && acpi_strict) |
604 | return AE_BAD_PARAMETER; | |
1da177e4 | 605 | |
b3b233c7 AS |
606 | acpi_ec_burst_enable(ec); |
607 | ||
3e71a87d AS |
608 | if (function == ACPI_READ) { |
609 | result = acpi_ec_read(ec, address, &temp); | |
610 | *value = temp; | |
611 | } else { | |
612 | temp = 0xff & (*value); | |
613 | result = acpi_ec_write(ec, address, temp); | |
614 | } | |
615 | ||
616 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
617 | ++address; | |
5b7734b4 AS |
618 | if (function == ACPI_READ) { |
619 | result = acpi_ec_read(ec, address, &temp); | |
620 | (*value) |= ((acpi_integer)temp) << i; | |
621 | } else { | |
622 | temp = 0xff & ((*value) >> i); | |
623 | result = acpi_ec_write(ec, address, temp); | |
624 | } | |
1da177e4 LT |
625 | } |
626 | ||
b3b233c7 AS |
627 | acpi_ec_burst_disable(ec); |
628 | ||
1da177e4 LT |
629 | switch (result) { |
630 | case -EINVAL: | |
d550d98d | 631 | return AE_BAD_PARAMETER; |
1da177e4 LT |
632 | break; |
633 | case -ENODEV: | |
d550d98d | 634 | return AE_NOT_FOUND; |
1da177e4 LT |
635 | break; |
636 | case -ETIME: | |
d550d98d | 637 | return AE_TIME; |
1da177e4 LT |
638 | break; |
639 | default: | |
d550d98d | 640 | return AE_OK; |
1da177e4 | 641 | } |
1da177e4 LT |
642 | } |
643 | ||
1da177e4 LT |
644 | /* -------------------------------------------------------------------------- |
645 | FS Interface (/proc) | |
646 | -------------------------------------------------------------------------- */ | |
647 | ||
50526df6 | 648 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 649 | |
50526df6 | 650 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 651 | { |
3d02b90b | 652 | struct acpi_ec *ec = seq->private; |
1da177e4 | 653 | |
1da177e4 LT |
654 | if (!ec) |
655 | goto end; | |
656 | ||
01f22462 AS |
657 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
658 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
659 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
660 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 661 | ec->global_lock ? "yes" : "no"); |
50526df6 | 662 | end: |
d550d98d | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
666 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
667 | { | |
668 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
669 | } | |
670 | ||
703959d4 | 671 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
672 | .open = acpi_ec_info_open_fs, |
673 | .read = seq_read, | |
674 | .llseek = seq_lseek, | |
675 | .release = single_release, | |
1da177e4 LT |
676 | .owner = THIS_MODULE, |
677 | }; | |
678 | ||
50526df6 | 679 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 680 | { |
50526df6 | 681 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 682 | |
1da177e4 LT |
683 | if (!acpi_device_dir(device)) { |
684 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 685 | acpi_ec_dir); |
1da177e4 | 686 | if (!acpi_device_dir(device)) |
d550d98d | 687 | return -ENODEV; |
1da177e4 LT |
688 | } |
689 | ||
cf7acfab DL |
690 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
691 | acpi_device_dir(device), | |
692 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 693 | if (!entry) |
d550d98d | 694 | return -ENODEV; |
d550d98d | 695 | return 0; |
1da177e4 LT |
696 | } |
697 | ||
50526df6 | 698 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 699 | { |
1da177e4 LT |
700 | |
701 | if (acpi_device_dir(device)) { | |
702 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
703 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
704 | acpi_device_dir(device) = NULL; | |
705 | } | |
706 | ||
d550d98d | 707 | return 0; |
1da177e4 LT |
708 | } |
709 | ||
1da177e4 LT |
710 | /* -------------------------------------------------------------------------- |
711 | Driver Interface | |
712 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
713 | static acpi_status |
714 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
715 | ||
c0900c35 AS |
716 | static struct acpi_ec *make_acpi_ec(void) |
717 | { | |
718 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
719 | if (!ec) | |
720 | return NULL; | |
080e412c | 721 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
722 | mutex_init(&ec->lock); |
723 | init_waitqueue_head(&ec->wait); | |
837012ed | 724 | INIT_LIST_HEAD(&ec->list); |
8463200a | 725 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
726 | return ec; |
727 | } | |
837012ed | 728 | |
c019b193 AS |
729 | static acpi_status |
730 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
731 | void *context, void **return_value) | |
732 | { | |
0175d562 LM |
733 | char node_name[5]; |
734 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
735 | struct acpi_ec *ec = context; |
736 | int value = 0; | |
0175d562 LM |
737 | acpi_status status; |
738 | ||
739 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
740 | ||
741 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
742 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
743 | } | |
744 | return AE_OK; | |
745 | } | |
746 | ||
cd8c93a4 AS |
747 | static acpi_status |
748 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 749 | { |
cd8c93a4 | 750 | acpi_status status; |
d21cf3c1 | 751 | unsigned long long tmp = 0; |
cd8c93a4 AS |
752 | |
753 | struct acpi_ec *ec = context; | |
754 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
755 | ec_parse_io_ports, ec); | |
756 | if (ACPI_FAILURE(status)) | |
757 | return status; | |
837012ed AS |
758 | |
759 | /* Get GPE bit assignment (EC events). */ | |
760 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 761 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
762 | if (ACPI_FAILURE(status)) |
763 | return status; | |
27663c58 | 764 | ec->gpe = tmp; |
837012ed | 765 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 766 | tmp = 0; |
27663c58 MW |
767 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
768 | ec->global_lock = tmp; | |
837012ed | 769 | ec->handle = handle; |
cd8c93a4 | 770 | return AE_CTRL_TERMINATE; |
837012ed AS |
771 | } |
772 | ||
4c611060 AS |
773 | static void ec_remove_handlers(struct acpi_ec *ec) |
774 | { | |
775 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
776 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 777 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
778 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
779 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 780 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 781 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
782 | } |
783 | ||
703959d4 | 784 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 785 | { |
703959d4 | 786 | struct acpi_ec *ec = NULL; |
45bea155 | 787 | |
45bea155 | 788 | if (!device) |
d550d98d | 789 | return -EINVAL; |
c0900c35 AS |
790 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
791 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
792 | ||
4c611060 | 793 | /* Check for boot EC */ |
ce52ddf5 AS |
794 | if (boot_ec && |
795 | (boot_ec->handle == device->handle || | |
796 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
797 | ec = boot_ec; | |
798 | boot_ec = NULL; | |
799 | } else { | |
800 | ec = make_acpi_ec(); | |
801 | if (!ec) | |
802 | return -ENOMEM; | |
803 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
804 | AE_CTRL_TERMINATE) { | |
805 | kfree(ec); | |
806 | return -EINVAL; | |
4c611060 AS |
807 | } |
808 | } | |
809 | ||
c0900c35 | 810 | ec->handle = device->handle; |
ce52ddf5 AS |
811 | |
812 | /* Find and register all query methods */ | |
813 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
814 | acpi_ec_register_query_methods, ec, NULL); | |
815 | ||
4c611060 AS |
816 | if (!first_ec) |
817 | first_ec = ec; | |
db89b4f0 | 818 | device->driver_data = ec; |
c0900c35 | 819 | acpi_ec_add_fs(device); |
3ebe08a7 | 820 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 821 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 822 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 823 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 824 | return 0; |
1da177e4 LT |
825 | } |
826 | ||
50526df6 | 827 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 828 | { |
01f22462 | 829 | struct acpi_ec *ec; |
07ddf768 | 830 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 831 | |
1da177e4 | 832 | if (!device) |
d550d98d | 833 | return -EINVAL; |
1da177e4 LT |
834 | |
835 | ec = acpi_driver_data(device); | |
837012ed | 836 | mutex_lock(&ec->lock); |
07ddf768 | 837 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
838 | list_del(&handler->node); |
839 | kfree(handler); | |
840 | } | |
841 | mutex_unlock(&ec->lock); | |
1da177e4 | 842 | acpi_ec_remove_fs(device); |
db89b4f0 | 843 | device->driver_data = NULL; |
d033879c | 844 | if (ec == first_ec) |
c0900c35 | 845 | first_ec = NULL; |
4c611060 | 846 | kfree(ec); |
d550d98d | 847 | return 0; |
1da177e4 LT |
848 | } |
849 | ||
1da177e4 | 850 | static acpi_status |
c0900c35 | 851 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 852 | { |
3d02b90b | 853 | struct acpi_ec *ec = context; |
1da177e4 | 854 | |
01f22462 | 855 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 856 | return AE_OK; |
1da177e4 LT |
857 | |
858 | /* | |
859 | * The first address region returned is the data port, and | |
860 | * the second address region returned is the status/command | |
861 | * port. | |
862 | */ | |
01f22462 | 863 | if (ec->data_addr == 0) |
6ffb221a | 864 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 865 | else if (ec->command_addr == 0) |
6ffb221a | 866 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 867 | else |
1da177e4 | 868 | return AE_CTRL_TERMINATE; |
1da177e4 | 869 | |
1da177e4 LT |
870 | return AE_OK; |
871 | } | |
872 | ||
e8284321 AS |
873 | static int ec_install_handlers(struct acpi_ec *ec) |
874 | { | |
c0900c35 | 875 | acpi_status status; |
7c6db4e0 | 876 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 877 | return 0; |
c0900c35 | 878 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
879 | ACPI_GPE_EDGE_TRIGGERED, |
880 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
881 | if (ACPI_FAILURE(status)) |
882 | return -ENODEV; | |
883 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
0b7084ac | 884 | acpi_enable_gpe(NULL, ec->gpe); |
e8284321 AS |
885 | status = acpi_install_address_space_handler(ec->handle, |
886 | ACPI_ADR_SPACE_EC, | |
887 | &acpi_ec_space_handler, | |
6d9e1120 | 888 | NULL, ec); |
e8284321 | 889 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
890 | if (status == AE_NOT_FOUND) { |
891 | /* | |
892 | * Maybe OS fails in evaluating the _REG object. | |
893 | * The AE_NOT_FOUND error will be ignored and OS | |
894 | * continue to initialize EC. | |
895 | */ | |
896 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
897 | " of EC device. Broken bios is suspected.\n"); | |
898 | } else { | |
899 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
900 | &acpi_ec_gpe_handler); | |
901 | return -ENODEV; | |
902 | } | |
e8284321 AS |
903 | } |
904 | ||
7c6db4e0 | 905 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
906 | return 0; |
907 | } | |
908 | ||
50526df6 | 909 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 910 | { |
c0900c35 | 911 | struct acpi_ec *ec; |
837012ed | 912 | int ret = 0; |
1da177e4 | 913 | |
1da177e4 | 914 | if (!device) |
d550d98d | 915 | return -EINVAL; |
1da177e4 LT |
916 | |
917 | ec = acpi_driver_data(device); | |
918 | ||
919 | if (!ec) | |
d550d98d | 920 | return -EINVAL; |
1da177e4 | 921 | |
4c611060 | 922 | ret = ec_install_handlers(ec); |
837012ed AS |
923 | |
924 | /* EC is fully operational, allow queries */ | |
080e412c | 925 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 926 | return ret; |
1da177e4 LT |
927 | } |
928 | ||
50526df6 | 929 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 930 | { |
c0900c35 | 931 | struct acpi_ec *ec; |
1da177e4 | 932 | if (!device) |
d550d98d | 933 | return -EINVAL; |
1da177e4 | 934 | ec = acpi_driver_data(device); |
c0900c35 AS |
935 | if (!ec) |
936 | return -EINVAL; | |
4c611060 | 937 | ec_remove_handlers(ec); |
f9319f90 | 938 | |
d550d98d | 939 | return 0; |
1da177e4 LT |
940 | } |
941 | ||
c04209a7 AS |
942 | int __init acpi_boot_ec_enable(void) |
943 | { | |
7c6db4e0 | 944 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
945 | return 0; |
946 | if (!ec_install_handlers(boot_ec)) { | |
947 | first_ec = boot_ec; | |
948 | return 0; | |
949 | } | |
950 | return -EFAULT; | |
951 | } | |
952 | ||
223883b7 AS |
953 | static const struct acpi_device_id ec_device_ids[] = { |
954 | {"PNP0C09", 0}, | |
955 | {"", 0}, | |
956 | }; | |
957 | ||
c0900c35 AS |
958 | int __init acpi_ec_ecdt_probe(void) |
959 | { | |
c0900c35 | 960 | acpi_status status; |
c6cb0e87 | 961 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 962 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 963 | |
d66d969d AS |
964 | boot_ec = make_acpi_ec(); |
965 | if (!boot_ec) | |
c0900c35 AS |
966 | return -ENOMEM; |
967 | /* | |
968 | * Generate a boot ec context | |
969 | */ | |
15a58ed1 AS |
970 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
971 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 972 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 973 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
974 | boot_ec->command_addr = ecdt_ptr->control.address; |
975 | boot_ec->data_addr = ecdt_ptr->data.address; | |
976 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 977 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 978 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 AS |
979 | /* Don't trust ECDT, which comes from ASUSTek */ |
980 | if (!dmi_name_in_vendors("ASUS")) | |
c5279dee | 981 | goto install; |
c6cb0e87 AS |
982 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
983 | if (!saved_ec) | |
984 | return -ENOMEM; | |
4312495f | 985 | memcpy(saved_ec, boot_ec, sizeof(*saved_ec)); |
c5279dee | 986 | /* fall through */ |
cd8c93a4 | 987 | } |
c5279dee AS |
988 | /* This workaround is needed only on some broken machines, |
989 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
990 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
991 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
992 | boot_ec, NULL); | |
993 | /* Check that acpi_get_devices actually find something */ | |
994 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
995 | goto error; | |
c6cb0e87 AS |
996 | if (saved_ec) { |
997 | /* try to find good ECDT from ASUSTek */ | |
998 | if (saved_ec->command_addr != boot_ec->command_addr || | |
999 | saved_ec->data_addr != boot_ec->data_addr || | |
1000 | saved_ec->gpe != boot_ec->gpe || | |
1001 | saved_ec->handle != boot_ec->handle) | |
1002 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
1003 | "ECDT tables, which are very hard to workaround. " | |
1004 | "Trying to use DSDT EC info instead. Please send " | |
1005 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1006 | kfree(saved_ec); | |
1007 | saved_ec = NULL; | |
1008 | } else { | |
1009 | /* We really need to limit this workaround, the only ASUS, | |
1010 | * which needs it, has fake EC._INI method, so use it as flag. | |
1011 | * Keep boot_ec struct as it will be needed soon. | |
1012 | */ | |
1013 | acpi_handle dummy; | |
1014 | if (!dmi_name_in_vendors("ASUS") || | |
1015 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
1016 | &dummy))) | |
1017 | return -ENODEV; | |
1018 | } | |
c5279dee AS |
1019 | install: |
1020 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1021 | first_ec = boot_ec; |
e8284321 | 1022 | return 0; |
d033879c | 1023 | } |
c5279dee | 1024 | error: |
d66d969d AS |
1025 | kfree(boot_ec); |
1026 | boot_ec = NULL; | |
1da177e4 LT |
1027 | return -ENODEV; |
1028 | } | |
1029 | ||
223883b7 AS |
1030 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1031 | { | |
1032 | struct acpi_ec *ec = acpi_driver_data(device); | |
1033 | /* Stop using GPE */ | |
1034 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1035 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 1036 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1037 | return 0; |
1038 | } | |
1039 | ||
1040 | static int acpi_ec_resume(struct acpi_device *device) | |
1041 | { | |
1042 | struct acpi_ec *ec = acpi_driver_data(device); | |
1043 | /* Enable use of GPE back */ | |
1044 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
0b7084ac | 1045 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1046 | return 0; |
1047 | } | |
1048 | ||
1049 | static struct acpi_driver acpi_ec_driver = { | |
1050 | .name = "ec", | |
1051 | .class = ACPI_EC_CLASS, | |
1052 | .ids = ec_device_ids, | |
1053 | .ops = { | |
1054 | .add = acpi_ec_add, | |
1055 | .remove = acpi_ec_remove, | |
1056 | .start = acpi_ec_start, | |
1057 | .stop = acpi_ec_stop, | |
1058 | .suspend = acpi_ec_suspend, | |
1059 | .resume = acpi_ec_resume, | |
1060 | }, | |
1061 | }; | |
1062 | ||
50526df6 | 1063 | static int __init acpi_ec_init(void) |
1da177e4 | 1064 | { |
50526df6 | 1065 | int result = 0; |
1da177e4 | 1066 | |
1da177e4 | 1067 | if (acpi_disabled) |
d550d98d | 1068 | return 0; |
1da177e4 LT |
1069 | |
1070 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1071 | if (!acpi_ec_dir) | |
d550d98d | 1072 | return -ENODEV; |
1da177e4 LT |
1073 | |
1074 | /* Now register the driver for the EC */ | |
1075 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1076 | if (result < 0) { | |
1077 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1078 | return -ENODEV; |
1da177e4 LT |
1079 | } |
1080 | ||
d550d98d | 1081 | return result; |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | subsys_initcall(acpi_ec_init); | |
1085 | ||
1086 | /* EC driver currently not unloadable */ | |
1087 | #if 0 | |
50526df6 | 1088 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1089 | { |
1da177e4 LT |
1090 | |
1091 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1092 | ||
1093 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1094 | ||
d550d98d | 1095 | return; |
1da177e4 | 1096 | } |
7843932a | 1097 | #endif /* 0 */ |