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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> | |
45 | #include <acpi/actypes.h> | |
46 | ||
1da177e4 | 47 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
48 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
49 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 50 | |
af3fd140 AS |
51 | #undef PREFIX |
52 | #define PREFIX "ACPI: EC: " | |
4350933a | 53 | |
703959d4 | 54 | /* EC status register */ |
1da177e4 LT |
55 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
56 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 57 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 58 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 59 | |
703959d4 | 60 | /* EC commands */ |
3261ff4d | 61 | enum ec_command { |
6ccedb10 AS |
62 | ACPI_EC_COMMAND_READ = 0x80, |
63 | ACPI_EC_COMMAND_WRITE = 0x81, | |
64 | ACPI_EC_BURST_ENABLE = 0x82, | |
65 | ACPI_EC_BURST_DISABLE = 0x83, | |
66 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 67 | }; |
837012ed | 68 | |
5c406412 | 69 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 70 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
e6e82a30 | 71 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
703959d4 | 72 | |
7c6db4e0 AS |
73 | #define ACPI_EC_STORM_THRESHOLD 20 /* number of false interrupts |
74 | per one transaction */ | |
75 | ||
080e412c | 76 | enum { |
080e412c | 77 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
78 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
79 | * for status change */ | |
b77d81b2 | 80 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
7c6db4e0 AS |
81 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
82 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
83 | * OpReg are installed */ | |
1da177e4 | 84 | }; |
6ffb221a DS |
85 | |
86 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 87 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
88 | typedef int (*acpi_ec_query_func) (void *data); |
89 | ||
90 | struct acpi_ec_query_handler { | |
91 | struct list_head node; | |
92 | acpi_ec_query_func func; | |
93 | acpi_handle handle; | |
94 | void *data; | |
95 | u8 query_bit; | |
96 | }; | |
97 | ||
7c6db4e0 AS |
98 | struct transaction_data { |
99 | const u8 *wdata; | |
100 | u8 *rdata; | |
101 | unsigned short irq_count; | |
102 | u8 wlen; | |
103 | u8 rlen; | |
104 | }; | |
105 | ||
a854e08a | 106 | static struct acpi_ec { |
703959d4 | 107 | acpi_handle handle; |
a86e2772 | 108 | unsigned long gpe; |
6ffb221a DS |
109 | unsigned long command_addr; |
110 | unsigned long data_addr; | |
703959d4 | 111 | unsigned long global_lock; |
080e412c | 112 | unsigned long flags; |
c787a855 | 113 | struct mutex lock; |
703959d4 | 114 | wait_queue_head_t wait; |
837012ed | 115 | struct list_head list; |
7c6db4e0 AS |
116 | struct transaction_data *t; |
117 | spinlock_t t_lock; | |
d033879c | 118 | } *boot_ec, *first_ec; |
703959d4 | 119 | |
2500822b ZY |
120 | /* |
121 | * Some Asus system have exchanged ECDT data/command IO addresses. | |
122 | */ | |
123 | static int print_ecdt_error(const struct dmi_system_id *id) | |
124 | { | |
125 | printk(KERN_NOTICE PREFIX "%s detected - " | |
126 | "ECDT has exchanged control/data I/O address\n", | |
127 | id->ident); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { | |
132 | { | |
133 | print_ecdt_error, "Asus L4R", { | |
134 | DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), | |
135 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), | |
136 | DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, | |
137 | { | |
138 | print_ecdt_error, "Asus M6R", { | |
139 | DMI_MATCH(DMI_BIOS_VERSION, "0207"), | |
140 | DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), | |
141 | DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, | |
142 | {}, | |
143 | }; | |
144 | ||
1da177e4 LT |
145 | /* -------------------------------------------------------------------------- |
146 | Transaction Management | |
147 | -------------------------------------------------------------------------- */ | |
148 | ||
6ffb221a | 149 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 150 | { |
3ebe08a7 | 151 | u8 x = inb(ec->command_addr); |
86dae015 | 152 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 153 | return x; |
451566f4 DT |
154 | } |
155 | ||
6ffb221a | 156 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 157 | { |
3ebe08a7 | 158 | u8 x = inb(ec->data_addr); |
86dae015 | 159 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 160 | return x; |
7c6db5e5 DS |
161 | } |
162 | ||
6ffb221a | 163 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 164 | { |
86dae015 | 165 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 166 | outb(command, ec->command_addr); |
45bea155 LY |
167 | } |
168 | ||
6ffb221a | 169 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 170 | { |
86dae015 | 171 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 172 | outb(data, ec->data_addr); |
703959d4 | 173 | } |
45bea155 | 174 | |
7c6db4e0 | 175 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 176 | { |
7c6db4e0 AS |
177 | unsigned long flags; |
178 | int ret = 0; | |
179 | spin_lock_irqsave(&ec->t_lock, flags); | |
180 | if (!ec->t || (!ec->t->wlen && !ec->t->rlen)) | |
181 | ret = 1; | |
182 | spin_unlock_irqrestore(&ec->t_lock, flags); | |
183 | return ret; | |
45bea155 | 184 | } |
451566f4 | 185 | |
7c6db4e0 | 186 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 187 | { |
7c6db4e0 AS |
188 | unsigned long flags; |
189 | spin_lock_irqsave(&ec->t_lock, flags); | |
190 | if (!ec->t) | |
191 | goto unlock; | |
192 | if (ec->t->wlen > 0) { | |
193 | if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
194 | acpi_ec_write_data(ec, *(ec->t->wdata++)); | |
195 | --ec->t->wlen; | |
196 | } else | |
197 | /* false interrupt, state didn't change */ | |
198 | ++ec->t->irq_count; | |
199 | ||
200 | } else if (ec->t->rlen > 0) { | |
201 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
202 | *(ec->t->rdata++) = acpi_ec_read_data(ec); | |
203 | --ec->t->rlen; | |
204 | } else | |
205 | /* false interrupt, state didn't change */ | |
206 | ++ec->t->irq_count; | |
207 | } | |
208 | unlock: | |
209 | spin_unlock_irqrestore(&ec->t_lock, flags); | |
845625cd | 210 | } |
03d1d99c | 211 | |
7c6db4e0 | 212 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 213 | { |
7c6db4e0 AS |
214 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
215 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
216 | return 0; | |
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 | ||
238 | static int ec_poll(struct acpi_ec *ec) | |
239 | { | |
240 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
241 | msleep(1); | |
242 | while (time_before(jiffies, delay)) { | |
243 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
244 | msleep(1); | |
245 | if (ec_transaction_done(ec)) | |
9d699ed9 | 246 | return 0; |
af3fd140 | 247 | } |
b77d81b2 | 248 | return -ETIME; |
1da177e4 LT |
249 | } |
250 | ||
703959d4 | 251 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 252 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
253 | u8 * rdata, unsigned rdata_len, |
254 | int force_poll) | |
45bea155 | 255 | { |
7c6db4e0 AS |
256 | unsigned long tmp; |
257 | struct transaction_data t = {.wdata = wdata, .rdata = rdata, | |
258 | .wlen = wdata_len, .rlen = rdata_len, | |
259 | .irq_count = 0}; | |
260 | int ret = 0; | |
3ebe08a7 | 261 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
262 | /* disable GPE during transaction if storm is detected */ |
263 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
264 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
265 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
3576cf61 | 266 | } |
7c6db4e0 AS |
267 | /* start transaction */ |
268 | spin_lock_irqsave(&ec->t_lock, tmp); | |
269 | /* following two actions should be kept atomic */ | |
270 | ec->t = &t; | |
271 | acpi_ec_write_cmd(ec, command); | |
272 | if (command == ACPI_EC_COMMAND_QUERY) | |
080e412c | 273 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
7c6db4e0 AS |
274 | spin_unlock_irqrestore(&ec->t_lock, tmp); |
275 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ | |
276 | if (force_poll || | |
277 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
278 | acpi_ec_wait(ec)) | |
279 | ret = ec_poll(ec); | |
3ebe08a7 | 280 | pr_debug(PREFIX "transaction end\n"); |
7c6db4e0 AS |
281 | spin_lock_irqsave(&ec->t_lock, tmp); |
282 | ec->t = NULL; | |
283 | spin_unlock_irqrestore(&ec->t_lock, tmp); | |
284 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
285 | /* check if we received SCI during transaction */ | |
286 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
287 | /* it is safe to enable GPE outside of transaction */ | |
288 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
289 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
290 | t.irq_count > ACPI_EC_STORM_THRESHOLD) { | |
291 | pr_debug(PREFIX "GPE storm detected\n"); | |
292 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
293 | } | |
294 | return ret; | |
295 | } | |
296 | ||
297 | static int ec_check_ibf0(struct acpi_ec *ec) | |
298 | { | |
299 | u8 status = acpi_ec_read_status(ec); | |
300 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
301 | } |
302 | ||
3576cf61 | 303 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 304 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
305 | u8 * rdata, unsigned rdata_len, |
306 | int force_poll) | |
1da177e4 | 307 | { |
d7a76e4c | 308 | int status; |
50526df6 | 309 | u32 glk; |
d7a76e4c | 310 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 311 | return -EINVAL; |
6ccedb10 AS |
312 | if (rdata) |
313 | memset(rdata, 0, rdata_len); | |
523953b4 | 314 | mutex_lock(&ec->lock); |
703959d4 | 315 | if (ec->global_lock) { |
1da177e4 | 316 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 317 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
318 | status = -ENODEV; |
319 | goto unlock; | |
c24e912b | 320 | } |
1da177e4 | 321 | } |
7c6db4e0 AS |
322 | if (!wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
323 | msecs_to_jiffies(ACPI_EC_DELAY))) { | |
3ebe08a7 MN |
324 | pr_err(PREFIX "input buffer is not empty, " |
325 | "aborting transaction\n"); | |
7c6db4e0 | 326 | status = -ETIME; |
451566f4 | 327 | goto end; |
716e084e | 328 | } |
6ccedb10 AS |
329 | status = acpi_ec_transaction_unlocked(ec, command, |
330 | wdata, wdata_len, | |
00eb43a1 LP |
331 | rdata, rdata_len, |
332 | force_poll); | |
7c6db4e0 | 333 | end: |
703959d4 | 334 | if (ec->global_lock) |
1da177e4 | 335 | acpi_release_global_lock(glk); |
7c6db4e0 | 336 | unlock: |
523953b4 | 337 | mutex_unlock(&ec->lock); |
d550d98d | 338 | return status; |
1da177e4 LT |
339 | } |
340 | ||
c45aac43 AS |
341 | /* |
342 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
343 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
344 | */ | |
345 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
346 | { | |
347 | u8 d; | |
00eb43a1 | 348 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
349 | } |
350 | ||
351 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
352 | { | |
7c6db4e0 AS |
353 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
354 | acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, | |
355 | NULL, 0, NULL, 0, 0) : 0; | |
c45aac43 AS |
356 | } |
357 | ||
6ccedb10 | 358 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
359 | { |
360 | int result; | |
361 | u8 d; | |
362 | ||
363 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 364 | &address, 1, &d, 1, 0); |
3576cf61 DS |
365 | *data = d; |
366 | return result; | |
367 | } | |
6ffb221a | 368 | |
3576cf61 DS |
369 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
370 | { | |
6ccedb10 AS |
371 | u8 wdata[2] = { address, data }; |
372 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 373 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
374 | } |
375 | ||
1da177e4 LT |
376 | /* |
377 | * Externally callable EC access functions. For now, assume 1 EC only | |
378 | */ | |
c45aac43 AS |
379 | int ec_burst_enable(void) |
380 | { | |
c45aac43 AS |
381 | if (!first_ec) |
382 | return -ENODEV; | |
d033879c | 383 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
384 | } |
385 | ||
386 | EXPORT_SYMBOL(ec_burst_enable); | |
387 | ||
388 | int ec_burst_disable(void) | |
389 | { | |
c45aac43 AS |
390 | if (!first_ec) |
391 | return -ENODEV; | |
d033879c | 392 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
393 | } |
394 | ||
395 | EXPORT_SYMBOL(ec_burst_disable); | |
396 | ||
6ccedb10 | 397 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 398 | { |
1da177e4 | 399 | int err; |
6ffb221a | 400 | u8 temp_data; |
1da177e4 LT |
401 | |
402 | if (!first_ec) | |
403 | return -ENODEV; | |
404 | ||
d033879c | 405 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
406 | |
407 | if (!err) { | |
408 | *val = temp_data; | |
409 | return 0; | |
50526df6 | 410 | } else |
1da177e4 LT |
411 | return err; |
412 | } | |
50526df6 | 413 | |
1da177e4 LT |
414 | EXPORT_SYMBOL(ec_read); |
415 | ||
50526df6 | 416 | int ec_write(u8 addr, u8 val) |
1da177e4 | 417 | { |
1da177e4 LT |
418 | int err; |
419 | ||
420 | if (!first_ec) | |
421 | return -ENODEV; | |
422 | ||
d033879c | 423 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
424 | |
425 | return err; | |
426 | } | |
50526df6 | 427 | |
1da177e4 LT |
428 | EXPORT_SYMBOL(ec_write); |
429 | ||
616362de | 430 | int ec_transaction(u8 command, |
9e197219 | 431 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
432 | u8 * rdata, unsigned rdata_len, |
433 | int force_poll) | |
45bea155 | 434 | { |
d7a76e4c LP |
435 | if (!first_ec) |
436 | return -ENODEV; | |
45bea155 | 437 | |
d033879c | 438 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
439 | wdata_len, rdata, rdata_len, |
440 | force_poll); | |
45bea155 | 441 | } |
1da177e4 | 442 | |
ab9e43c6 LP |
443 | EXPORT_SYMBOL(ec_transaction); |
444 | ||
6ccedb10 | 445 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
446 | { |
447 | int result; | |
6ccedb10 | 448 | u8 d; |
1da177e4 | 449 | |
6ccedb10 AS |
450 | if (!ec || !data) |
451 | return -EINVAL; | |
1da177e4 | 452 | |
6ccedb10 AS |
453 | /* |
454 | * Query the EC to find out which _Qxx method we need to evaluate. | |
455 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
456 | * bit to be cleared (and thus clearing the interrupt source). | |
457 | */ | |
716e084e | 458 | |
00eb43a1 | 459 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
460 | if (result) |
461 | return result; | |
1da177e4 | 462 | |
6ccedb10 AS |
463 | if (!d) |
464 | return -ENODATA; | |
1da177e4 | 465 | |
6ccedb10 AS |
466 | *data = d; |
467 | return 0; | |
1da177e4 LT |
468 | } |
469 | ||
1da177e4 LT |
470 | /* -------------------------------------------------------------------------- |
471 | Event Management | |
472 | -------------------------------------------------------------------------- */ | |
837012ed AS |
473 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
474 | acpi_handle handle, acpi_ec_query_func func, | |
475 | void *data) | |
476 | { | |
477 | struct acpi_ec_query_handler *handler = | |
478 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
479 | if (!handler) | |
480 | return -ENOMEM; | |
481 | ||
482 | handler->query_bit = query_bit; | |
483 | handler->handle = handle; | |
484 | handler->func = func; | |
485 | handler->data = data; | |
486 | mutex_lock(&ec->lock); | |
30c08574 | 487 | list_add(&handler->node, &ec->list); |
837012ed AS |
488 | mutex_unlock(&ec->lock); |
489 | return 0; | |
490 | } | |
491 | ||
492 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
493 | ||
494 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
495 | { | |
1544fdbc | 496 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 497 | mutex_lock(&ec->lock); |
1544fdbc | 498 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
499 | if (query_bit == handler->query_bit) { |
500 | list_del(&handler->node); | |
501 | kfree(handler); | |
837012ed AS |
502 | } |
503 | } | |
504 | mutex_unlock(&ec->lock); | |
505 | } | |
506 | ||
507 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 508 | |
50526df6 | 509 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 510 | { |
3d02b90b | 511 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 512 | u8 value = 0; |
837012ed | 513 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 514 | |
5d0c288b | 515 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 516 | return; |
837012ed AS |
517 | mutex_lock(&ec->lock); |
518 | list_for_each_entry(handler, &ec->list, node) { | |
519 | if (value == handler->query_bit) { | |
520 | /* have custom handler for this bit */ | |
521 | memcpy(©, handler, sizeof(copy)); | |
522 | mutex_unlock(&ec->lock); | |
523 | if (copy.func) { | |
524 | copy.func(copy.data); | |
525 | } else if (copy.handle) { | |
526 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
527 | } | |
528 | return; | |
529 | } | |
530 | } | |
531 | mutex_unlock(&ec->lock); | |
45bea155 | 532 | } |
1da177e4 | 533 | |
50526df6 | 534 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 535 | { |
3d02b90b | 536 | struct acpi_ec *ec = data; |
7c6db4e0 | 537 | u8 status; |
00eb43a1 | 538 | |
3ebe08a7 | 539 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
540 | status = acpi_ec_read_status(ec); |
541 | ||
542 | gpe_transaction(ec, status); | |
543 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
af3fd140 | 544 | wake_up(&ec->wait); |
451566f4 | 545 | |
7c6db4e0 AS |
546 | ec_check_sci(ec, status); |
547 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
548 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 549 | /* this is non-query, must be confirmation */ |
3ebe08a7 MN |
550 | if (printk_ratelimit()) |
551 | pr_info(PREFIX "non-query interrupt received," | |
552 | " switching to interrupt mode\n"); | |
7843932a | 553 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 554 | } |
7c6db4e0 | 555 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
556 | } |
557 | ||
1da177e4 LT |
558 | /* -------------------------------------------------------------------------- |
559 | Address Space Management | |
560 | -------------------------------------------------------------------------- */ | |
561 | ||
1da177e4 | 562 | static acpi_status |
5b7734b4 AS |
563 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
564 | u32 bits, acpi_integer *value, | |
50526df6 | 565 | void *handler_context, void *region_context) |
1da177e4 | 566 | { |
3d02b90b | 567 | struct acpi_ec *ec = handler_context; |
3e71a87d | 568 | int result = 0, i; |
5b7734b4 | 569 | u8 temp = 0; |
1da177e4 | 570 | |
1da177e4 | 571 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 572 | return AE_BAD_PARAMETER; |
1da177e4 | 573 | |
5b7734b4 | 574 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 575 | return AE_BAD_PARAMETER; |
1da177e4 | 576 | |
5b7734b4 AS |
577 | if (bits != 8 && acpi_strict) |
578 | return AE_BAD_PARAMETER; | |
1da177e4 | 579 | |
b3b233c7 AS |
580 | acpi_ec_burst_enable(ec); |
581 | ||
3e71a87d AS |
582 | if (function == ACPI_READ) { |
583 | result = acpi_ec_read(ec, address, &temp); | |
584 | *value = temp; | |
585 | } else { | |
586 | temp = 0xff & (*value); | |
587 | result = acpi_ec_write(ec, address, temp); | |
588 | } | |
589 | ||
590 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
591 | ++address; | |
5b7734b4 AS |
592 | if (function == ACPI_READ) { |
593 | result = acpi_ec_read(ec, address, &temp); | |
594 | (*value) |= ((acpi_integer)temp) << i; | |
595 | } else { | |
596 | temp = 0xff & ((*value) >> i); | |
597 | result = acpi_ec_write(ec, address, temp); | |
598 | } | |
1da177e4 LT |
599 | } |
600 | ||
b3b233c7 AS |
601 | acpi_ec_burst_disable(ec); |
602 | ||
1da177e4 LT |
603 | switch (result) { |
604 | case -EINVAL: | |
d550d98d | 605 | return AE_BAD_PARAMETER; |
1da177e4 LT |
606 | break; |
607 | case -ENODEV: | |
d550d98d | 608 | return AE_NOT_FOUND; |
1da177e4 LT |
609 | break; |
610 | case -ETIME: | |
d550d98d | 611 | return AE_TIME; |
1da177e4 LT |
612 | break; |
613 | default: | |
d550d98d | 614 | return AE_OK; |
1da177e4 | 615 | } |
1da177e4 LT |
616 | } |
617 | ||
1da177e4 LT |
618 | /* -------------------------------------------------------------------------- |
619 | FS Interface (/proc) | |
620 | -------------------------------------------------------------------------- */ | |
621 | ||
50526df6 | 622 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 623 | |
50526df6 | 624 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 625 | { |
3d02b90b | 626 | struct acpi_ec *ec = seq->private; |
1da177e4 | 627 | |
1da177e4 LT |
628 | if (!ec) |
629 | goto end; | |
630 | ||
01f22462 AS |
631 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
632 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
633 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
634 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 635 | ec->global_lock ? "yes" : "no"); |
50526df6 | 636 | end: |
d550d98d | 637 | return 0; |
1da177e4 LT |
638 | } |
639 | ||
640 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
641 | { | |
642 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
643 | } | |
644 | ||
703959d4 | 645 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
646 | .open = acpi_ec_info_open_fs, |
647 | .read = seq_read, | |
648 | .llseek = seq_lseek, | |
649 | .release = single_release, | |
1da177e4 LT |
650 | .owner = THIS_MODULE, |
651 | }; | |
652 | ||
50526df6 | 653 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 654 | { |
50526df6 | 655 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 656 | |
1da177e4 LT |
657 | if (!acpi_device_dir(device)) { |
658 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 659 | acpi_ec_dir); |
1da177e4 | 660 | if (!acpi_device_dir(device)) |
d550d98d | 661 | return -ENODEV; |
1da177e4 LT |
662 | } |
663 | ||
cf7acfab DL |
664 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
665 | acpi_device_dir(device), | |
666 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 667 | if (!entry) |
d550d98d | 668 | return -ENODEV; |
d550d98d | 669 | return 0; |
1da177e4 LT |
670 | } |
671 | ||
50526df6 | 672 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 673 | { |
1da177e4 LT |
674 | |
675 | if (acpi_device_dir(device)) { | |
676 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
677 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
678 | acpi_device_dir(device) = NULL; | |
679 | } | |
680 | ||
d550d98d | 681 | return 0; |
1da177e4 LT |
682 | } |
683 | ||
1da177e4 LT |
684 | /* -------------------------------------------------------------------------- |
685 | Driver Interface | |
686 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
687 | static acpi_status |
688 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
689 | ||
c0900c35 AS |
690 | static struct acpi_ec *make_acpi_ec(void) |
691 | { | |
692 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
693 | if (!ec) | |
694 | return NULL; | |
080e412c | 695 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
696 | mutex_init(&ec->lock); |
697 | init_waitqueue_head(&ec->wait); | |
837012ed | 698 | INIT_LIST_HEAD(&ec->list); |
7c6db4e0 | 699 | spin_lock_init(&ec->t_lock); |
c0900c35 AS |
700 | return ec; |
701 | } | |
837012ed | 702 | |
c019b193 AS |
703 | static acpi_status |
704 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
705 | void *context, void **return_value) | |
706 | { | |
707 | struct acpi_namespace_node *node = handle; | |
708 | struct acpi_ec *ec = context; | |
709 | int value = 0; | |
710 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
711 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
712 | } | |
713 | return AE_OK; | |
714 | } | |
715 | ||
cd8c93a4 AS |
716 | static acpi_status |
717 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 718 | { |
cd8c93a4 AS |
719 | acpi_status status; |
720 | ||
721 | struct acpi_ec *ec = context; | |
722 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
723 | ec_parse_io_ports, ec); | |
724 | if (ACPI_FAILURE(status)) | |
725 | return status; | |
837012ed AS |
726 | |
727 | /* Get GPE bit assignment (EC events). */ | |
728 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
729 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
730 | if (ACPI_FAILURE(status)) | |
731 | return status; | |
837012ed AS |
732 | /* Use the global lock for all EC transactions? */ |
733 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 734 | ec->handle = handle; |
cd8c93a4 | 735 | return AE_CTRL_TERMINATE; |
837012ed AS |
736 | } |
737 | ||
4c611060 AS |
738 | static void ec_remove_handlers(struct acpi_ec *ec) |
739 | { | |
740 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
741 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 742 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
743 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
744 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 745 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 746 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
747 | } |
748 | ||
703959d4 | 749 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 750 | { |
703959d4 | 751 | struct acpi_ec *ec = NULL; |
45bea155 | 752 | |
45bea155 | 753 | if (!device) |
d550d98d | 754 | return -EINVAL; |
c0900c35 AS |
755 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
756 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
757 | ||
4c611060 | 758 | /* Check for boot EC */ |
ce52ddf5 AS |
759 | if (boot_ec && |
760 | (boot_ec->handle == device->handle || | |
761 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
762 | ec = boot_ec; | |
763 | boot_ec = NULL; | |
764 | } else { | |
765 | ec = make_acpi_ec(); | |
766 | if (!ec) | |
767 | return -ENOMEM; | |
768 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
769 | AE_CTRL_TERMINATE) { | |
770 | kfree(ec); | |
771 | return -EINVAL; | |
4c611060 AS |
772 | } |
773 | } | |
774 | ||
c0900c35 | 775 | ec->handle = device->handle; |
ce52ddf5 AS |
776 | |
777 | /* Find and register all query methods */ | |
778 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
779 | acpi_ec_register_query_methods, ec, NULL); | |
780 | ||
4c611060 AS |
781 | if (!first_ec) |
782 | first_ec = ec; | |
c0900c35 | 783 | acpi_driver_data(device) = ec; |
c0900c35 | 784 | acpi_ec_add_fs(device); |
3ebe08a7 | 785 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 786 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 787 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 788 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 789 | return 0; |
1da177e4 LT |
790 | } |
791 | ||
50526df6 | 792 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 793 | { |
01f22462 | 794 | struct acpi_ec *ec; |
07ddf768 | 795 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 796 | |
1da177e4 | 797 | if (!device) |
d550d98d | 798 | return -EINVAL; |
1da177e4 LT |
799 | |
800 | ec = acpi_driver_data(device); | |
837012ed | 801 | mutex_lock(&ec->lock); |
07ddf768 | 802 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
803 | list_del(&handler->node); |
804 | kfree(handler); | |
805 | } | |
806 | mutex_unlock(&ec->lock); | |
1da177e4 | 807 | acpi_ec_remove_fs(device); |
c0900c35 | 808 | acpi_driver_data(device) = NULL; |
d033879c | 809 | if (ec == first_ec) |
c0900c35 | 810 | first_ec = NULL; |
4c611060 | 811 | kfree(ec); |
d550d98d | 812 | return 0; |
1da177e4 LT |
813 | } |
814 | ||
1da177e4 | 815 | static acpi_status |
c0900c35 | 816 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 817 | { |
3d02b90b | 818 | struct acpi_ec *ec = context; |
1da177e4 | 819 | |
01f22462 | 820 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 821 | return AE_OK; |
1da177e4 LT |
822 | |
823 | /* | |
824 | * The first address region returned is the data port, and | |
825 | * the second address region returned is the status/command | |
826 | * port. | |
827 | */ | |
01f22462 | 828 | if (ec->data_addr == 0) |
6ffb221a | 829 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 830 | else if (ec->command_addr == 0) |
6ffb221a | 831 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 832 | else |
1da177e4 | 833 | return AE_CTRL_TERMINATE; |
1da177e4 | 834 | |
1da177e4 LT |
835 | return AE_OK; |
836 | } | |
837 | ||
e8284321 AS |
838 | static int ec_install_handlers(struct acpi_ec *ec) |
839 | { | |
c0900c35 | 840 | acpi_status status; |
7c6db4e0 | 841 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 842 | return 0; |
c0900c35 | 843 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
844 | ACPI_GPE_EDGE_TRIGGERED, |
845 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
846 | if (ACPI_FAILURE(status)) |
847 | return -ENODEV; | |
848 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
849 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
e8284321 AS |
850 | status = acpi_install_address_space_handler(ec->handle, |
851 | ACPI_ADR_SPACE_EC, | |
852 | &acpi_ec_space_handler, | |
6d9e1120 | 853 | NULL, ec); |
e8284321 AS |
854 | if (ACPI_FAILURE(status)) { |
855 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
856 | return -ENODEV; | |
857 | } | |
858 | ||
7c6db4e0 | 859 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
860 | return 0; |
861 | } | |
862 | ||
50526df6 | 863 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 864 | { |
c0900c35 | 865 | struct acpi_ec *ec; |
837012ed | 866 | int ret = 0; |
1da177e4 | 867 | |
1da177e4 | 868 | if (!device) |
d550d98d | 869 | return -EINVAL; |
1da177e4 LT |
870 | |
871 | ec = acpi_driver_data(device); | |
872 | ||
873 | if (!ec) | |
d550d98d | 874 | return -EINVAL; |
1da177e4 | 875 | |
4c611060 | 876 | ret = ec_install_handlers(ec); |
837012ed AS |
877 | |
878 | /* EC is fully operational, allow queries */ | |
080e412c | 879 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 880 | return ret; |
1da177e4 LT |
881 | } |
882 | ||
50526df6 | 883 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 884 | { |
c0900c35 | 885 | struct acpi_ec *ec; |
1da177e4 | 886 | if (!device) |
d550d98d | 887 | return -EINVAL; |
1da177e4 | 888 | ec = acpi_driver_data(device); |
c0900c35 AS |
889 | if (!ec) |
890 | return -EINVAL; | |
4c611060 | 891 | ec_remove_handlers(ec); |
f9319f90 | 892 | |
d550d98d | 893 | return 0; |
1da177e4 LT |
894 | } |
895 | ||
c04209a7 AS |
896 | int __init acpi_boot_ec_enable(void) |
897 | { | |
7c6db4e0 | 898 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
899 | return 0; |
900 | if (!ec_install_handlers(boot_ec)) { | |
901 | first_ec = boot_ec; | |
902 | return 0; | |
903 | } | |
904 | return -EFAULT; | |
905 | } | |
906 | ||
223883b7 AS |
907 | static const struct acpi_device_id ec_device_ids[] = { |
908 | {"PNP0C09", 0}, | |
909 | {"", 0}, | |
910 | }; | |
911 | ||
c0900c35 AS |
912 | int __init acpi_ec_ecdt_probe(void) |
913 | { | |
914 | int ret; | |
915 | acpi_status status; | |
50526df6 | 916 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 917 | |
d66d969d AS |
918 | boot_ec = make_acpi_ec(); |
919 | if (!boot_ec) | |
c0900c35 AS |
920 | return -ENOMEM; |
921 | /* | |
922 | * Generate a boot ec context | |
923 | */ | |
15a58ed1 AS |
924 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
925 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 926 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 927 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
928 | boot_ec->command_addr = ecdt_ptr->control.address; |
929 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
930 | if (dmi_check_system(ec_dmi_table)) { |
931 | /* | |
932 | * If the board falls into ec_dmi_table, it means | |
933 | * that ECDT table gives the incorrect command/status | |
934 | * & data I/O address. Just fix it. | |
935 | */ | |
936 | boot_ec->data_addr = ecdt_ptr->control.address; | |
937 | boot_ec->command_addr = ecdt_ptr->data.address; | |
938 | } | |
cd8c93a4 | 939 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 940 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 941 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 942 | } else { |
5870a8cd AS |
943 | /* This workaround is needed only on some broken machines, |
944 | * which require early EC, but fail to provide ECDT */ | |
945 | acpi_handle x; | |
cd8c93a4 AS |
946 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
947 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
948 | boot_ec, NULL); | |
2d8348b4 AS |
949 | /* Check that acpi_get_devices actually find something */ |
950 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 951 | goto error; |
5870a8cd AS |
952 | /* We really need to limit this workaround, the only ASUS, |
953 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 954 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
955 | */ |
956 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 957 | return -ENODEV; |
cd8c93a4 | 958 | } |
1da177e4 | 959 | |
d66d969d | 960 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
961 | if (!ret) { |
962 | first_ec = boot_ec; | |
e8284321 | 963 | return 0; |
d033879c | 964 | } |
c0900c35 | 965 | error: |
d66d969d AS |
966 | kfree(boot_ec); |
967 | boot_ec = NULL; | |
1da177e4 LT |
968 | return -ENODEV; |
969 | } | |
970 | ||
223883b7 AS |
971 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
972 | { | |
973 | struct acpi_ec *ec = acpi_driver_data(device); | |
974 | /* Stop using GPE */ | |
975 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
976 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
977 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
978 | return 0; | |
979 | } | |
980 | ||
981 | static int acpi_ec_resume(struct acpi_device *device) | |
982 | { | |
983 | struct acpi_ec *ec = acpi_driver_data(device); | |
984 | /* Enable use of GPE back */ | |
985 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
986 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
987 | return 0; | |
988 | } | |
989 | ||
990 | static struct acpi_driver acpi_ec_driver = { | |
991 | .name = "ec", | |
992 | .class = ACPI_EC_CLASS, | |
993 | .ids = ec_device_ids, | |
994 | .ops = { | |
995 | .add = acpi_ec_add, | |
996 | .remove = acpi_ec_remove, | |
997 | .start = acpi_ec_start, | |
998 | .stop = acpi_ec_stop, | |
999 | .suspend = acpi_ec_suspend, | |
1000 | .resume = acpi_ec_resume, | |
1001 | }, | |
1002 | }; | |
1003 | ||
50526df6 | 1004 | static int __init acpi_ec_init(void) |
1da177e4 | 1005 | { |
50526df6 | 1006 | int result = 0; |
1da177e4 | 1007 | |
1da177e4 | 1008 | if (acpi_disabled) |
d550d98d | 1009 | return 0; |
1da177e4 LT |
1010 | |
1011 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1012 | if (!acpi_ec_dir) | |
d550d98d | 1013 | return -ENODEV; |
1da177e4 LT |
1014 | |
1015 | /* Now register the driver for the EC */ | |
1016 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1017 | if (result < 0) { | |
1018 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1019 | return -ENODEV; |
1da177e4 LT |
1020 | } |
1021 | ||
d550d98d | 1022 | return result; |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | subsys_initcall(acpi_ec_init); | |
1026 | ||
1027 | /* EC driver currently not unloadable */ | |
1028 | #if 0 | |
50526df6 | 1029 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1030 | { |
1da177e4 LT |
1031 | |
1032 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1033 | ||
1034 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1035 | ||
d550d98d | 1036 | return; |
1da177e4 | 1037 | } |
7843932a | 1038 | #endif /* 0 */ |