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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 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 */ |
34ff4dbc | 70 | #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */ |
2a84cb98 | 71 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
703959d4 | 72 | |
06cf7d3c | 73 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
74 | per one transaction */ |
75 | ||
080e412c | 76 | enum { |
080e412c | 77 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
78 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
79 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
80 | * OpReg are installed */ | |
1da177e4 | 81 | }; |
6ffb221a DS |
82 | |
83 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 84 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
85 | typedef int (*acpi_ec_query_func) (void *data); |
86 | ||
87 | struct acpi_ec_query_handler { | |
88 | struct list_head node; | |
89 | acpi_ec_query_func func; | |
90 | acpi_handle handle; | |
91 | void *data; | |
92 | u8 query_bit; | |
93 | }; | |
94 | ||
8463200a | 95 | struct transaction { |
7c6db4e0 AS |
96 | const u8 *wdata; |
97 | u8 *rdata; | |
98 | unsigned short irq_count; | |
8463200a | 99 | u8 command; |
a2f93aea AS |
100 | u8 wi; |
101 | u8 ri; | |
7c6db4e0 AS |
102 | u8 wlen; |
103 | u8 rlen; | |
dd15f8c4 | 104 | bool done; |
7c6db4e0 AS |
105 | }; |
106 | ||
a854e08a | 107 | static struct acpi_ec { |
703959d4 | 108 | acpi_handle handle; |
a86e2772 | 109 | unsigned long gpe; |
6ffb221a DS |
110 | unsigned long command_addr; |
111 | unsigned long data_addr; | |
703959d4 | 112 | unsigned long global_lock; |
080e412c | 113 | unsigned long flags; |
c787a855 | 114 | struct mutex lock; |
703959d4 | 115 | wait_queue_head_t wait; |
837012ed | 116 | struct list_head list; |
8463200a AS |
117 | struct transaction *curr; |
118 | spinlock_t curr_lock; | |
d033879c | 119 | } *boot_ec, *first_ec; |
703959d4 | 120 | |
5423a0cb AS |
121 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
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 | ||
2a84cb98 | 171 | static void advance_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 AS |
202 | static void acpi_ec_gpe_query(void *ec_cxt); |
203 | ||
204 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 205 | { |
7c6db4e0 AS |
206 | if (state & ACPI_EC_FLAG_SCI) { |
207 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
208 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
209 | acpi_ec_gpe_query, ec); | |
210 | } | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int ec_poll(struct acpi_ec *ec) | |
215 | { | |
2a84cb98 AS |
216 | unsigned long flags; |
217 | int repeat = 2; /* number of command restarts */ | |
218 | while (repeat--) { | |
219 | unsigned long delay = jiffies + | |
220 | msecs_to_jiffies(ACPI_EC_DELAY); | |
221 | do { | |
222 | /* don't sleep with disabled interrupts */ | |
223 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
224 | udelay(ACPI_EC_MSI_UDELAY); | |
225 | if (ec_transaction_done(ec)) | |
226 | return 0; | |
227 | } else { | |
228 | if (wait_event_timeout(ec->wait, | |
229 | ec_transaction_done(ec), | |
230 | msecs_to_jiffies(1))) | |
231 | return 0; | |
232 | } | |
233 | advance_transaction(ec, acpi_ec_read_status(ec)); | |
234 | } while (time_before(jiffies, delay)); | |
235 | if (!ec->curr->irq_count || | |
236 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) | |
237 | break; | |
238 | /* try restart command if we get any false interrupts */ | |
239 | pr_debug(PREFIX "controller reset, restart transaction\n"); | |
240 | spin_lock_irqsave(&ec->curr_lock, flags); | |
241 | start_transaction(ec); | |
242 | spin_unlock_irqrestore(&ec->curr_lock, flags); | |
af3fd140 | 243 | } |
b77d81b2 | 244 | return -ETIME; |
1da177e4 LT |
245 | } |
246 | ||
8463200a | 247 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 248 | struct transaction *t) |
45bea155 | 249 | { |
7c6db4e0 | 250 | unsigned long tmp; |
7c6db4e0 | 251 | int ret = 0; |
3ebe08a7 | 252 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
253 | /* disable GPE during transaction if storm is detected */ |
254 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
0b7084ac | 255 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 256 | } |
5423a0cb | 257 | if (EC_FLAGS_MSI) |
2a84cb98 | 258 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 259 | /* start transaction */ |
8463200a | 260 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 261 | /* following two actions should be kept atomic */ |
8463200a | 262 | ec->curr = t; |
a2f93aea | 263 | start_transaction(ec); |
8463200a | 264 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 265 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 266 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
2a84cb98 | 267 | ret = ec_poll(ec); |
3ebe08a7 | 268 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
269 | spin_lock_irqsave(&ec->curr_lock, tmp); |
270 | ec->curr = NULL; | |
271 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
272 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
273 | /* check if we received SCI during transaction */ | |
274 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
275 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 276 | acpi_enable_gpe(NULL, ec->gpe); |
2a84cb98 | 277 | } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
278 | pr_info(PREFIX "GPE storm detected, " |
279 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
280 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
281 | } | |
282 | return ret; | |
283 | } | |
284 | ||
285 | static int ec_check_ibf0(struct acpi_ec *ec) | |
286 | { | |
287 | u8 status = acpi_ec_read_status(ec); | |
288 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
289 | } |
290 | ||
c0ff1772 AS |
291 | static int ec_wait_ibf0(struct acpi_ec *ec) |
292 | { | |
293 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
294 | /* interrupt wait manually if GPE mode is not active */ | |
c0ff1772 | 295 | while (time_before(jiffies, delay)) |
2a84cb98 AS |
296 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
297 | msecs_to_jiffies(1))) | |
c0ff1772 AS |
298 | return 0; |
299 | return -ETIME; | |
45bea155 LY |
300 | } |
301 | ||
2a84cb98 | 302 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 303 | { |
d7a76e4c | 304 | int status; |
50526df6 | 305 | u32 glk; |
8463200a | 306 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 307 | return -EINVAL; |
8463200a AS |
308 | if (t->rdata) |
309 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 310 | mutex_lock(&ec->lock); |
703959d4 | 311 | if (ec->global_lock) { |
1da177e4 | 312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 313 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
314 | status = -ENODEV; |
315 | goto unlock; | |
c24e912b | 316 | } |
1da177e4 | 317 | } |
c0ff1772 | 318 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
319 | pr_err(PREFIX "input buffer is not empty, " |
320 | "aborting transaction\n"); | |
7c6db4e0 | 321 | status = -ETIME; |
451566f4 | 322 | goto end; |
716e084e | 323 | } |
2a84cb98 | 324 | status = acpi_ec_transaction_unlocked(ec, t); |
7c6db4e0 | 325 | end: |
703959d4 | 326 | if (ec->global_lock) |
1da177e4 | 327 | acpi_release_global_lock(glk); |
7c6db4e0 | 328 | unlock: |
523953b4 | 329 | mutex_unlock(&ec->lock); |
d550d98d | 330 | return status; |
1da177e4 LT |
331 | } |
332 | ||
c45aac43 AS |
333 | /* |
334 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
335 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
336 | */ | |
8a383ef0 | 337 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
338 | { |
339 | u8 d; | |
8463200a AS |
340 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
341 | .wdata = NULL, .rdata = &d, | |
342 | .wlen = 0, .rlen = 1}; | |
343 | ||
2a84cb98 | 344 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
345 | } |
346 | ||
8a383ef0 | 347 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 348 | { |
8463200a AS |
349 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
350 | .wdata = NULL, .rdata = NULL, | |
351 | .wlen = 0, .rlen = 0}; | |
352 | ||
7c6db4e0 | 353 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 354 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
355 | } |
356 | ||
6ccedb10 | 357 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
358 | { |
359 | int result; | |
360 | u8 d; | |
8463200a AS |
361 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
362 | .wdata = &address, .rdata = &d, | |
363 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 364 | |
2a84cb98 | 365 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
366 | *data = d; |
367 | return result; | |
368 | } | |
6ffb221a | 369 | |
3576cf61 DS |
370 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
371 | { | |
6ccedb10 | 372 | u8 wdata[2] = { address, data }; |
8463200a AS |
373 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
374 | .wdata = wdata, .rdata = NULL, | |
375 | .wlen = 2, .rlen = 0}; | |
376 | ||
2a84cb98 | 377 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
378 | } |
379 | ||
1da177e4 LT |
380 | /* |
381 | * Externally callable EC access functions. For now, assume 1 EC only | |
382 | */ | |
c45aac43 AS |
383 | int ec_burst_enable(void) |
384 | { | |
c45aac43 AS |
385 | if (!first_ec) |
386 | return -ENODEV; | |
d033879c | 387 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
388 | } |
389 | ||
390 | EXPORT_SYMBOL(ec_burst_enable); | |
391 | ||
392 | int ec_burst_disable(void) | |
393 | { | |
c45aac43 AS |
394 | if (!first_ec) |
395 | return -ENODEV; | |
d033879c | 396 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
397 | } |
398 | ||
399 | EXPORT_SYMBOL(ec_burst_disable); | |
400 | ||
6ccedb10 | 401 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 402 | { |
1da177e4 | 403 | int err; |
6ffb221a | 404 | u8 temp_data; |
1da177e4 LT |
405 | |
406 | if (!first_ec) | |
407 | return -ENODEV; | |
408 | ||
d033879c | 409 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
410 | |
411 | if (!err) { | |
412 | *val = temp_data; | |
413 | return 0; | |
50526df6 | 414 | } else |
1da177e4 LT |
415 | return err; |
416 | } | |
50526df6 | 417 | |
1da177e4 LT |
418 | EXPORT_SYMBOL(ec_read); |
419 | ||
50526df6 | 420 | int ec_write(u8 addr, u8 val) |
1da177e4 | 421 | { |
1da177e4 LT |
422 | int err; |
423 | ||
424 | if (!first_ec) | |
425 | return -ENODEV; | |
426 | ||
d033879c | 427 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
428 | |
429 | return err; | |
430 | } | |
50526df6 | 431 | |
1da177e4 LT |
432 | EXPORT_SYMBOL(ec_write); |
433 | ||
616362de | 434 | int ec_transaction(u8 command, |
9e197219 | 435 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
436 | u8 * rdata, unsigned rdata_len, |
437 | int force_poll) | |
45bea155 | 438 | { |
8463200a AS |
439 | struct transaction t = {.command = command, |
440 | .wdata = wdata, .rdata = rdata, | |
441 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
442 | if (!first_ec) |
443 | return -ENODEV; | |
45bea155 | 444 | |
2a84cb98 | 445 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 446 | } |
1da177e4 | 447 | |
ab9e43c6 LP |
448 | EXPORT_SYMBOL(ec_transaction); |
449 | ||
6ccedb10 | 450 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
451 | { |
452 | int result; | |
6ccedb10 | 453 | u8 d; |
8463200a AS |
454 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
455 | .wdata = NULL, .rdata = &d, | |
456 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
457 | if (!ec || !data) |
458 | return -EINVAL; | |
1da177e4 | 459 | |
6ccedb10 AS |
460 | /* |
461 | * Query the EC to find out which _Qxx method we need to evaluate. | |
462 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
463 | * bit to be cleared (and thus clearing the interrupt source). | |
464 | */ | |
716e084e | 465 | |
2a84cb98 | 466 | result = acpi_ec_transaction(ec, &t); |
6ccedb10 AS |
467 | if (result) |
468 | return result; | |
1da177e4 | 469 | |
6ccedb10 AS |
470 | if (!d) |
471 | return -ENODATA; | |
1da177e4 | 472 | |
6ccedb10 AS |
473 | *data = d; |
474 | return 0; | |
1da177e4 LT |
475 | } |
476 | ||
1da177e4 LT |
477 | /* -------------------------------------------------------------------------- |
478 | Event Management | |
479 | -------------------------------------------------------------------------- */ | |
837012ed AS |
480 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
481 | acpi_handle handle, acpi_ec_query_func func, | |
482 | void *data) | |
483 | { | |
484 | struct acpi_ec_query_handler *handler = | |
485 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
486 | if (!handler) | |
487 | return -ENOMEM; | |
488 | ||
489 | handler->query_bit = query_bit; | |
490 | handler->handle = handle; | |
491 | handler->func = func; | |
492 | handler->data = data; | |
493 | mutex_lock(&ec->lock); | |
30c08574 | 494 | list_add(&handler->node, &ec->list); |
837012ed AS |
495 | mutex_unlock(&ec->lock); |
496 | return 0; | |
497 | } | |
498 | ||
499 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
500 | ||
501 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
502 | { | |
1544fdbc | 503 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 504 | mutex_lock(&ec->lock); |
1544fdbc | 505 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
506 | if (query_bit == handler->query_bit) { |
507 | list_del(&handler->node); | |
508 | kfree(handler); | |
837012ed AS |
509 | } |
510 | } | |
511 | mutex_unlock(&ec->lock); | |
512 | } | |
513 | ||
514 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 515 | |
50526df6 | 516 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 517 | { |
3d02b90b | 518 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 519 | u8 value = 0; |
837012ed | 520 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 521 | |
5d0c288b | 522 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 523 | return; |
837012ed AS |
524 | mutex_lock(&ec->lock); |
525 | list_for_each_entry(handler, &ec->list, node) { | |
526 | if (value == handler->query_bit) { | |
527 | /* have custom handler for this bit */ | |
528 | memcpy(©, handler, sizeof(copy)); | |
529 | mutex_unlock(&ec->lock); | |
530 | if (copy.func) { | |
531 | copy.func(copy.data); | |
532 | } else if (copy.handle) { | |
533 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
534 | } | |
535 | return; | |
536 | } | |
537 | } | |
538 | mutex_unlock(&ec->lock); | |
45bea155 | 539 | } |
1da177e4 | 540 | |
50526df6 | 541 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 542 | { |
3d02b90b | 543 | struct acpi_ec *ec = data; |
7c6db4e0 | 544 | u8 status; |
00eb43a1 | 545 | |
3ebe08a7 | 546 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
547 | status = acpi_ec_read_status(ec); |
548 | ||
2a84cb98 AS |
549 | advance_transaction(ec, status); |
550 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
551 | wake_up(&ec->wait); | |
7c6db4e0 | 552 | ec_check_sci(ec, status); |
7c6db4e0 | 553 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
554 | } |
555 | ||
1da177e4 LT |
556 | /* -------------------------------------------------------------------------- |
557 | Address Space Management | |
558 | -------------------------------------------------------------------------- */ | |
559 | ||
1da177e4 | 560 | static acpi_status |
5b7734b4 AS |
561 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
562 | u32 bits, acpi_integer *value, | |
50526df6 | 563 | void *handler_context, void *region_context) |
1da177e4 | 564 | { |
3d02b90b | 565 | struct acpi_ec *ec = handler_context; |
3e71a87d | 566 | int result = 0, i; |
5b7734b4 | 567 | u8 temp = 0; |
1da177e4 | 568 | |
1da177e4 | 569 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 570 | return AE_BAD_PARAMETER; |
1da177e4 | 571 | |
5b7734b4 | 572 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 573 | return AE_BAD_PARAMETER; |
1da177e4 | 574 | |
5b7734b4 AS |
575 | if (bits != 8 && acpi_strict) |
576 | return AE_BAD_PARAMETER; | |
1da177e4 | 577 | |
b3b233c7 AS |
578 | acpi_ec_burst_enable(ec); |
579 | ||
3e71a87d AS |
580 | if (function == ACPI_READ) { |
581 | result = acpi_ec_read(ec, address, &temp); | |
582 | *value = temp; | |
583 | } else { | |
584 | temp = 0xff & (*value); | |
585 | result = acpi_ec_write(ec, address, temp); | |
586 | } | |
587 | ||
588 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
589 | ++address; | |
5b7734b4 AS |
590 | if (function == ACPI_READ) { |
591 | result = acpi_ec_read(ec, address, &temp); | |
592 | (*value) |= ((acpi_integer)temp) << i; | |
593 | } else { | |
594 | temp = 0xff & ((*value) >> i); | |
595 | result = acpi_ec_write(ec, address, temp); | |
596 | } | |
1da177e4 LT |
597 | } |
598 | ||
b3b233c7 AS |
599 | acpi_ec_burst_disable(ec); |
600 | ||
1da177e4 LT |
601 | switch (result) { |
602 | case -EINVAL: | |
d550d98d | 603 | return AE_BAD_PARAMETER; |
1da177e4 LT |
604 | break; |
605 | case -ENODEV: | |
d550d98d | 606 | return AE_NOT_FOUND; |
1da177e4 LT |
607 | break; |
608 | case -ETIME: | |
d550d98d | 609 | return AE_TIME; |
1da177e4 LT |
610 | break; |
611 | default: | |
d550d98d | 612 | return AE_OK; |
1da177e4 | 613 | } |
1da177e4 LT |
614 | } |
615 | ||
1da177e4 LT |
616 | /* -------------------------------------------------------------------------- |
617 | FS Interface (/proc) | |
618 | -------------------------------------------------------------------------- */ | |
619 | ||
50526df6 | 620 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 621 | |
50526df6 | 622 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 623 | { |
3d02b90b | 624 | struct acpi_ec *ec = seq->private; |
1da177e4 | 625 | |
1da177e4 LT |
626 | if (!ec) |
627 | goto end; | |
628 | ||
01f22462 AS |
629 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
630 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
631 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
632 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 633 | ec->global_lock ? "yes" : "no"); |
50526df6 | 634 | end: |
d550d98d | 635 | return 0; |
1da177e4 LT |
636 | } |
637 | ||
638 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
639 | { | |
640 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
641 | } | |
642 | ||
070d8eb1 | 643 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
644 | .open = acpi_ec_info_open_fs, |
645 | .read = seq_read, | |
646 | .llseek = seq_lseek, | |
647 | .release = single_release, | |
1da177e4 LT |
648 | .owner = THIS_MODULE, |
649 | }; | |
650 | ||
50526df6 | 651 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 652 | { |
50526df6 | 653 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 654 | |
1da177e4 LT |
655 | if (!acpi_device_dir(device)) { |
656 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 657 | acpi_ec_dir); |
1da177e4 | 658 | if (!acpi_device_dir(device)) |
d550d98d | 659 | return -ENODEV; |
1da177e4 LT |
660 | } |
661 | ||
cf7acfab DL |
662 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
663 | acpi_device_dir(device), | |
664 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 665 | if (!entry) |
d550d98d | 666 | return -ENODEV; |
d550d98d | 667 | return 0; |
1da177e4 LT |
668 | } |
669 | ||
50526df6 | 670 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 671 | { |
1da177e4 LT |
672 | |
673 | if (acpi_device_dir(device)) { | |
674 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
675 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
676 | acpi_device_dir(device) = NULL; | |
677 | } | |
678 | ||
d550d98d | 679 | return 0; |
1da177e4 LT |
680 | } |
681 | ||
1da177e4 LT |
682 | /* -------------------------------------------------------------------------- |
683 | Driver Interface | |
684 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
685 | static acpi_status |
686 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
687 | ||
c0900c35 AS |
688 | static struct acpi_ec *make_acpi_ec(void) |
689 | { | |
690 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
691 | if (!ec) | |
692 | return NULL; | |
080e412c | 693 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
694 | mutex_init(&ec->lock); |
695 | init_waitqueue_head(&ec->wait); | |
837012ed | 696 | INIT_LIST_HEAD(&ec->list); |
8463200a | 697 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
698 | return ec; |
699 | } | |
837012ed | 700 | |
c019b193 AS |
701 | static acpi_status |
702 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
703 | void *context, void **return_value) | |
704 | { | |
0175d562 LM |
705 | char node_name[5]; |
706 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
707 | struct acpi_ec *ec = context; |
708 | int value = 0; | |
0175d562 LM |
709 | acpi_status status; |
710 | ||
711 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
712 | ||
713 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
714 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
715 | } | |
716 | return AE_OK; | |
717 | } | |
718 | ||
cd8c93a4 AS |
719 | static acpi_status |
720 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 721 | { |
cd8c93a4 | 722 | acpi_status status; |
d21cf3c1 | 723 | unsigned long long tmp = 0; |
cd8c93a4 AS |
724 | |
725 | struct acpi_ec *ec = context; | |
a5032bfd AS |
726 | |
727 | /* clear addr values, ec_parse_io_ports depend on it */ | |
728 | ec->command_addr = ec->data_addr = 0; | |
729 | ||
cd8c93a4 AS |
730 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
731 | ec_parse_io_ports, ec); | |
732 | if (ACPI_FAILURE(status)) | |
733 | return status; | |
837012ed AS |
734 | |
735 | /* Get GPE bit assignment (EC events). */ | |
736 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 737 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
738 | if (ACPI_FAILURE(status)) |
739 | return status; | |
27663c58 | 740 | ec->gpe = tmp; |
837012ed | 741 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 742 | tmp = 0; |
27663c58 MW |
743 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
744 | ec->global_lock = tmp; | |
837012ed | 745 | ec->handle = handle; |
cd8c93a4 | 746 | return AE_CTRL_TERMINATE; |
837012ed AS |
747 | } |
748 | ||
4c611060 AS |
749 | static void ec_remove_handlers(struct acpi_ec *ec) |
750 | { | |
751 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
752 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 753 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
754 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
755 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 756 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 757 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
758 | } |
759 | ||
703959d4 | 760 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 761 | { |
703959d4 | 762 | struct acpi_ec *ec = NULL; |
45bea155 | 763 | |
45bea155 | 764 | if (!device) |
d550d98d | 765 | return -EINVAL; |
c0900c35 AS |
766 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
767 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
768 | ||
4c611060 | 769 | /* Check for boot EC */ |
ce52ddf5 AS |
770 | if (boot_ec && |
771 | (boot_ec->handle == device->handle || | |
772 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
773 | ec = boot_ec; | |
774 | boot_ec = NULL; | |
775 | } else { | |
776 | ec = make_acpi_ec(); | |
777 | if (!ec) | |
778 | return -ENOMEM; | |
a5032bfd AS |
779 | } |
780 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
781 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
782 | kfree(ec); |
783 | return -EINVAL; | |
4c611060 AS |
784 | } |
785 | ||
c0900c35 | 786 | ec->handle = device->handle; |
ce52ddf5 AS |
787 | |
788 | /* Find and register all query methods */ | |
789 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
790 | acpi_ec_register_query_methods, ec, NULL); | |
791 | ||
4c611060 AS |
792 | if (!first_ec) |
793 | first_ec = ec; | |
db89b4f0 | 794 | device->driver_data = ec; |
c0900c35 | 795 | acpi_ec_add_fs(device); |
3ebe08a7 | 796 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 797 | ec->gpe, ec->command_addr, ec->data_addr); |
c0900c35 | 798 | return 0; |
1da177e4 LT |
799 | } |
800 | ||
50526df6 | 801 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 802 | { |
01f22462 | 803 | struct acpi_ec *ec; |
07ddf768 | 804 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 805 | |
1da177e4 | 806 | if (!device) |
d550d98d | 807 | return -EINVAL; |
1da177e4 LT |
808 | |
809 | ec = acpi_driver_data(device); | |
837012ed | 810 | mutex_lock(&ec->lock); |
07ddf768 | 811 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
812 | list_del(&handler->node); |
813 | kfree(handler); | |
814 | } | |
815 | mutex_unlock(&ec->lock); | |
1da177e4 | 816 | acpi_ec_remove_fs(device); |
db89b4f0 | 817 | device->driver_data = NULL; |
d033879c | 818 | if (ec == first_ec) |
c0900c35 | 819 | first_ec = NULL; |
4c611060 | 820 | kfree(ec); |
d550d98d | 821 | return 0; |
1da177e4 LT |
822 | } |
823 | ||
1da177e4 | 824 | static acpi_status |
c0900c35 | 825 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 826 | { |
3d02b90b | 827 | struct acpi_ec *ec = context; |
1da177e4 | 828 | |
01f22462 | 829 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 830 | return AE_OK; |
1da177e4 LT |
831 | |
832 | /* | |
833 | * The first address region returned is the data port, and | |
834 | * the second address region returned is the status/command | |
835 | * port. | |
836 | */ | |
01f22462 | 837 | if (ec->data_addr == 0) |
6ffb221a | 838 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 839 | else if (ec->command_addr == 0) |
6ffb221a | 840 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 841 | else |
1da177e4 | 842 | return AE_CTRL_TERMINATE; |
1da177e4 | 843 | |
1da177e4 LT |
844 | return AE_OK; |
845 | } | |
846 | ||
e8284321 AS |
847 | static int ec_install_handlers(struct acpi_ec *ec) |
848 | { | |
c0900c35 | 849 | acpi_status status; |
7c6db4e0 | 850 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 851 | return 0; |
c0900c35 | 852 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
853 | ACPI_GPE_EDGE_TRIGGERED, |
854 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
855 | if (ACPI_FAILURE(status)) |
856 | return -ENODEV; | |
857 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
0b7084ac | 858 | acpi_enable_gpe(NULL, ec->gpe); |
e8284321 AS |
859 | status = acpi_install_address_space_handler(ec->handle, |
860 | ACPI_ADR_SPACE_EC, | |
861 | &acpi_ec_space_handler, | |
6d9e1120 | 862 | NULL, ec); |
e8284321 | 863 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
864 | if (status == AE_NOT_FOUND) { |
865 | /* | |
866 | * Maybe OS fails in evaluating the _REG object. | |
867 | * The AE_NOT_FOUND error will be ignored and OS | |
868 | * continue to initialize EC. | |
869 | */ | |
870 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
871 | " of EC device. Broken bios is suspected.\n"); | |
872 | } else { | |
873 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
874 | &acpi_ec_gpe_handler); | |
875 | return -ENODEV; | |
876 | } | |
e8284321 AS |
877 | } |
878 | ||
7c6db4e0 | 879 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
880 | return 0; |
881 | } | |
882 | ||
50526df6 | 883 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 884 | { |
c0900c35 | 885 | struct acpi_ec *ec; |
837012ed | 886 | int ret = 0; |
1da177e4 | 887 | |
1da177e4 | 888 | if (!device) |
d550d98d | 889 | return -EINVAL; |
1da177e4 LT |
890 | |
891 | ec = acpi_driver_data(device); | |
892 | ||
893 | if (!ec) | |
d550d98d | 894 | return -EINVAL; |
1da177e4 | 895 | |
4c611060 | 896 | ret = ec_install_handlers(ec); |
837012ed AS |
897 | |
898 | /* EC is fully operational, allow queries */ | |
080e412c | 899 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 900 | return ret; |
1da177e4 LT |
901 | } |
902 | ||
50526df6 | 903 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 904 | { |
c0900c35 | 905 | struct acpi_ec *ec; |
1da177e4 | 906 | if (!device) |
d550d98d | 907 | return -EINVAL; |
1da177e4 | 908 | ec = acpi_driver_data(device); |
c0900c35 AS |
909 | if (!ec) |
910 | return -EINVAL; | |
4c611060 | 911 | ec_remove_handlers(ec); |
f9319f90 | 912 | |
d550d98d | 913 | return 0; |
1da177e4 LT |
914 | } |
915 | ||
c04209a7 AS |
916 | int __init acpi_boot_ec_enable(void) |
917 | { | |
7c6db4e0 | 918 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
919 | return 0; |
920 | if (!ec_install_handlers(boot_ec)) { | |
921 | first_ec = boot_ec; | |
922 | return 0; | |
923 | } | |
924 | return -EFAULT; | |
925 | } | |
926 | ||
223883b7 AS |
927 | static const struct acpi_device_id ec_device_ids[] = { |
928 | {"PNP0C09", 0}, | |
929 | {"", 0}, | |
930 | }; | |
931 | ||
c0900c35 AS |
932 | int __init acpi_ec_ecdt_probe(void) |
933 | { | |
c0900c35 | 934 | acpi_status status; |
c6cb0e87 | 935 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 936 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 937 | |
d66d969d AS |
938 | boot_ec = make_acpi_ec(); |
939 | if (!boot_ec) | |
c0900c35 AS |
940 | return -ENOMEM; |
941 | /* | |
942 | * Generate a boot ec context | |
943 | */ | |
5423a0cb AS |
944 | if (dmi_name_in_vendors("Micro-Star") || |
945 | dmi_name_in_vendors("Notebook")) { | |
946 | pr_info(PREFIX "Enabling special treatment for EC from MSI.\n"); | |
947 | EC_FLAGS_MSI = 1; | |
948 | } | |
15a58ed1 AS |
949 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
950 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 951 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 952 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
953 | boot_ec->command_addr = ecdt_ptr->control.address; |
954 | boot_ec->data_addr = ecdt_ptr->data.address; | |
955 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 956 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 957 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 958 | /* Don't trust ECDT, which comes from ASUSTek */ |
a5032bfd | 959 | if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0) |
c5279dee | 960 | goto install; |
c6cb0e87 AS |
961 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
962 | if (!saved_ec) | |
963 | return -ENOMEM; | |
a5032bfd | 964 | memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec)); |
c5279dee | 965 | /* fall through */ |
cd8c93a4 | 966 | } |
c5279dee AS |
967 | /* This workaround is needed only on some broken machines, |
968 | * which require early EC, but fail to provide ECDT */ | |
c5279dee AS |
969 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
970 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
971 | boot_ec, NULL); | |
972 | /* Check that acpi_get_devices actually find something */ | |
973 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
974 | goto error; | |
c6cb0e87 AS |
975 | if (saved_ec) { |
976 | /* try to find good ECDT from ASUSTek */ | |
977 | if (saved_ec->command_addr != boot_ec->command_addr || | |
978 | saved_ec->data_addr != boot_ec->data_addr || | |
979 | saved_ec->gpe != boot_ec->gpe || | |
980 | saved_ec->handle != boot_ec->handle) | |
981 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " | |
982 | "ECDT tables, which are very hard to workaround. " | |
983 | "Trying to use DSDT EC info instead. Please send " | |
984 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
985 | kfree(saved_ec); | |
986 | saved_ec = NULL; | |
987 | } else { | |
988 | /* We really need to limit this workaround, the only ASUS, | |
989 | * which needs it, has fake EC._INI method, so use it as flag. | |
990 | * Keep boot_ec struct as it will be needed soon. | |
991 | */ | |
992 | acpi_handle dummy; | |
993 | if (!dmi_name_in_vendors("ASUS") || | |
994 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", | |
995 | &dummy))) | |
996 | return -ENODEV; | |
997 | } | |
c5279dee AS |
998 | install: |
999 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1000 | first_ec = boot_ec; |
e8284321 | 1001 | return 0; |
d033879c | 1002 | } |
c5279dee | 1003 | error: |
d66d969d AS |
1004 | kfree(boot_ec); |
1005 | boot_ec = NULL; | |
1da177e4 LT |
1006 | return -ENODEV; |
1007 | } | |
1008 | ||
223883b7 AS |
1009 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1010 | { | |
1011 | struct acpi_ec *ec = acpi_driver_data(device); | |
1012 | /* Stop using GPE */ | |
0b7084ac | 1013 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1014 | return 0; |
1015 | } | |
1016 | ||
1017 | static int acpi_ec_resume(struct acpi_device *device) | |
1018 | { | |
1019 | struct acpi_ec *ec = acpi_driver_data(device); | |
1020 | /* Enable use of GPE back */ | |
0b7084ac | 1021 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | static struct acpi_driver acpi_ec_driver = { | |
1026 | .name = "ec", | |
1027 | .class = ACPI_EC_CLASS, | |
1028 | .ids = ec_device_ids, | |
1029 | .ops = { | |
1030 | .add = acpi_ec_add, | |
1031 | .remove = acpi_ec_remove, | |
1032 | .start = acpi_ec_start, | |
1033 | .stop = acpi_ec_stop, | |
1034 | .suspend = acpi_ec_suspend, | |
1035 | .resume = acpi_ec_resume, | |
1036 | }, | |
1037 | }; | |
1038 | ||
a5f820fe | 1039 | int __init acpi_ec_init(void) |
1da177e4 | 1040 | { |
50526df6 | 1041 | int result = 0; |
1da177e4 | 1042 | |
1da177e4 LT |
1043 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
1044 | if (!acpi_ec_dir) | |
d550d98d | 1045 | return -ENODEV; |
1da177e4 LT |
1046 | |
1047 | /* Now register the driver for the EC */ | |
1048 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1049 | if (result < 0) { | |
1050 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1051 | return -ENODEV; |
1da177e4 LT |
1052 | } |
1053 | ||
d550d98d | 1054 | return result; |
1da177e4 LT |
1055 | } |
1056 | ||
1da177e4 LT |
1057 | /* EC driver currently not unloadable */ |
1058 | #if 0 | |
50526df6 | 1059 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1060 | { |
1da177e4 LT |
1061 | |
1062 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1063 | ||
1064 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1065 | ||
d550d98d | 1066 | return; |
1da177e4 | 1067 | } |
7843932a | 1068 | #endif /* 0 */ |