Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
01f22462 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.0) |
1da177e4 | 3 | * |
01f22462 AS |
4 | * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
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 | ||
d772b3b3 MN |
29 | /* Uncomment next line to get verbose print outs*/ |
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> |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/acpi_drivers.h> | |
44 | #include <acpi/actypes.h> | |
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 | |
703959d4 | 68 | /* EC events */ |
3261ff4d | 69 | enum ec_event { |
703959d4 | 70 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
080e412c | 71 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
72 | }; |
73 | ||
5c406412 | 74 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 75 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 76 | |
080e412c AS |
77 | enum { |
78 | EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ | |
79 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ | |
7843932a | 80 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ |
f2d68935 AS |
81 | EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ |
82 | EC_FLAGS_ADDRESS, /* Address is being written */ | |
e790cc8b AS |
83 | EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */ |
84 | EC_FLAGS_WDATA, /* Data is being written */ | |
03d1d99c | 85 | EC_FLAGS_NO_OBF1_GPE, /* Don't expect GPE before read */ |
080e412c AS |
86 | }; |
87 | ||
50526df6 LB |
88 | static int acpi_ec_remove(struct acpi_device *device, int type); |
89 | static int acpi_ec_start(struct acpi_device *device); | |
90 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 91 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 | 92 | |
1ba90e3a TR |
93 | static const struct acpi_device_id ec_device_ids[] = { |
94 | {"PNP0C09", 0}, | |
95 | {"", 0}, | |
96 | }; | |
97 | ||
1da177e4 | 98 | static struct acpi_driver acpi_ec_driver = { |
c2b6705b | 99 | .name = "ec", |
50526df6 | 100 | .class = ACPI_EC_CLASS, |
1ba90e3a | 101 | .ids = ec_device_ids, |
50526df6 | 102 | .ops = { |
703959d4 | 103 | .add = acpi_ec_add, |
50526df6 LB |
104 | .remove = acpi_ec_remove, |
105 | .start = acpi_ec_start, | |
106 | .stop = acpi_ec_stop, | |
107 | }, | |
1da177e4 | 108 | }; |
6ffb221a DS |
109 | |
110 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 111 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
112 | typedef int (*acpi_ec_query_func) (void *data); |
113 | ||
114 | struct acpi_ec_query_handler { | |
115 | struct list_head node; | |
116 | acpi_ec_query_func func; | |
117 | acpi_handle handle; | |
118 | void *data; | |
119 | u8 query_bit; | |
120 | }; | |
121 | ||
a854e08a | 122 | static struct acpi_ec { |
703959d4 | 123 | acpi_handle handle; |
a86e2772 | 124 | unsigned long gpe; |
6ffb221a DS |
125 | unsigned long command_addr; |
126 | unsigned long data_addr; | |
703959d4 | 127 | unsigned long global_lock; |
080e412c | 128 | unsigned long flags; |
c787a855 | 129 | struct mutex lock; |
703959d4 | 130 | wait_queue_head_t wait; |
837012ed | 131 | struct list_head list; |
4c611060 | 132 | u8 handlers_installed; |
d033879c | 133 | } *boot_ec, *first_ec; |
703959d4 | 134 | |
1da177e4 LT |
135 | /* -------------------------------------------------------------------------- |
136 | Transaction Management | |
137 | -------------------------------------------------------------------------- */ | |
138 | ||
6ffb221a | 139 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 140 | { |
3ebe08a7 | 141 | u8 x = inb(ec->command_addr); |
86dae015 | 142 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 143 | return x; |
451566f4 DT |
144 | } |
145 | ||
6ffb221a | 146 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 147 | { |
3ebe08a7 | 148 | u8 x = inb(ec->data_addr); |
86dae015 | 149 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
6ffb221a | 150 | return inb(ec->data_addr); |
7c6db5e5 DS |
151 | } |
152 | ||
6ffb221a | 153 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 154 | { |
86dae015 | 155 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 156 | outb(command, ec->command_addr); |
45bea155 LY |
157 | } |
158 | ||
6ffb221a | 159 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 160 | { |
86dae015 | 161 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 162 | outb(data, ec->data_addr); |
703959d4 | 163 | } |
45bea155 | 164 | |
080e412c | 165 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 166 | { |
080e412c | 167 | if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags)) |
9e197219 | 168 | return 0; |
78d0af33 | 169 | if (event == ACPI_EC_EVENT_OBF_1) { |
080e412c | 170 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
703959d4 | 171 | return 1; |
78d0af33 | 172 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
080e412c | 173 | if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) |
703959d4 | 174 | return 1; |
45bea155 LY |
175 | } |
176 | ||
703959d4 | 177 | return 0; |
45bea155 | 178 | } |
451566f4 | 179 | |
080e412c | 180 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) |
7c6db5e5 | 181 | { |
f2d68935 | 182 | int ret = 0; |
03d1d99c AS |
183 | |
184 | if (unlikely(event == ACPI_EC_EVENT_OBF_1 && | |
185 | test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags))) | |
186 | force_poll = 1; | |
f2d68935 AS |
187 | if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && |
188 | test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) | |
189 | force_poll = 1; | |
e790cc8b AS |
190 | if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) && |
191 | test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags))) | |
192 | force_poll = 1; | |
7843932a AS |
193 | if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && |
194 | likely(!force_poll)) { | |
080e412c AS |
195 | if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), |
196 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
f2d68935 | 197 | goto end; |
080e412c AS |
198 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
199 | if (acpi_ec_check_status(ec, event)) { | |
03d1d99c AS |
200 | if (event == ACPI_EC_EVENT_OBF_1) { |
201 | /* miss OBF_1 GPE, don't expect it */ | |
202 | pr_info(PREFIX "missing OBF confirmation, " | |
203 | "don't expect it any longer.\n"); | |
204 | set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags); | |
205 | } else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { | |
f2d68935 | 206 | /* miss address GPE, don't expect it anymore */ |
e790cc8b | 207 | pr_info(PREFIX "missing address confirmation, " |
f2d68935 AS |
208 | "don't expect it any longer.\n"); |
209 | set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); | |
e790cc8b AS |
210 | } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) { |
211 | /* miss write data GPE, don't expect it */ | |
212 | pr_info(PREFIX "missing write data confirmation, " | |
213 | "don't expect it any longer.\n"); | |
214 | set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags); | |
95b937e3 | 215 | } else { |
66c5f4e7 | 216 | /* missing GPEs, switch back to poll mode */ |
3ebe08a7 | 217 | if (printk_ratelimit()) |
e790cc8b | 218 | pr_info(PREFIX "missing confirmations, " |
3ebe08a7 | 219 | "switch off interrupt mode.\n"); |
66c5f4e7 | 220 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 221 | } |
f2d68935 | 222 | goto end; |
703959d4 | 223 | } |
7843932a AS |
224 | } else { |
225 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
226 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
227 | while (time_before(jiffies, delay)) { | |
228 | if (acpi_ec_check_status(ec, event)) | |
f2d68935 | 229 | goto end; |
7843932a | 230 | } |
af3fd140 | 231 | } |
3ebe08a7 | 232 | pr_err(PREFIX "acpi_ec_wait timeout," |
080e412c AS |
233 | " status = %d, expect_event = %d\n", |
234 | acpi_ec_read_status(ec), event); | |
f2d68935 AS |
235 | ret = -ETIME; |
236 | end: | |
237 | clear_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
238 | return ret; | |
1da177e4 LT |
239 | } |
240 | ||
703959d4 | 241 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 242 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
243 | u8 * rdata, unsigned rdata_len, |
244 | int force_poll) | |
45bea155 | 245 | { |
af3fd140 | 246 | int result = 0; |
080e412c | 247 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 248 | acpi_ec_write_cmd(ec, command); |
3ebe08a7 | 249 | pr_debug(PREFIX "transaction start\n"); |
78d0af33 | 250 | for (; wdata_len > 0; --wdata_len) { |
080e412c | 251 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 252 | if (result) { |
3ebe08a7 | 253 | pr_err(PREFIX |
6ccedb10 | 254 | "write_cmd timeout, command = %d\n", command); |
af3fd140 AS |
255 | goto end; |
256 | } | |
f2d68935 AS |
257 | /* mark the address byte written to EC */ |
258 | if (rdata_len + wdata_len > 1) | |
259 | set_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
080e412c | 260 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 261 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 262 | } |
45bea155 | 263 | |
d91df1aa | 264 | if (!rdata_len) { |
e790cc8b | 265 | set_bit(EC_FLAGS_WDATA, &ec->flags); |
080e412c | 266 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 267 | if (result) { |
3ebe08a7 | 268 | pr_err(PREFIX |
6ccedb10 | 269 | "finish-write timeout, command = %d\n", command); |
af3fd140 AS |
270 | goto end; |
271 | } | |
080e412c AS |
272 | } else if (command == ACPI_EC_COMMAND_QUERY) |
273 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
45bea155 | 274 | |
78d0af33 | 275 | for (; rdata_len > 0; --rdata_len) { |
080e412c | 276 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); |
af3fd140 | 277 | if (result) { |
3ebe08a7 | 278 | pr_err(PREFIX "read timeout, command = %d\n", command); |
af3fd140 AS |
279 | goto end; |
280 | } | |
0c5d31f4 AS |
281 | /* Don't expect GPE after last read */ |
282 | if (rdata_len > 1) | |
283 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
6ffb221a | 284 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 285 | } |
af3fd140 | 286 | end: |
3ebe08a7 | 287 | pr_debug(PREFIX "transaction end\n"); |
af3fd140 | 288 | return result; |
45bea155 LY |
289 | } |
290 | ||
3576cf61 | 291 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 292 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
293 | u8 * rdata, unsigned rdata_len, |
294 | int force_poll) | |
1da177e4 | 295 | { |
d7a76e4c | 296 | int status; |
50526df6 | 297 | u32 glk; |
1da177e4 | 298 | |
d7a76e4c | 299 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 300 | return -EINVAL; |
1da177e4 | 301 | |
6ccedb10 AS |
302 | if (rdata) |
303 | memset(rdata, 0, rdata_len); | |
1da177e4 | 304 | |
523953b4 | 305 | mutex_lock(&ec->lock); |
703959d4 | 306 | if (ec->global_lock) { |
1da177e4 | 307 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
308 | if (ACPI_FAILURE(status)) { |
309 | mutex_unlock(&ec->lock); | |
d550d98d | 310 | return -ENODEV; |
c24e912b | 311 | } |
1da177e4 | 312 | } |
451566f4 | 313 | |
080e412c | 314 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 315 | if (status) { |
3ebe08a7 MN |
316 | pr_err(PREFIX "input buffer is not empty, " |
317 | "aborting transaction\n"); | |
451566f4 | 318 | goto end; |
716e084e | 319 | } |
1da177e4 | 320 | |
6ccedb10 AS |
321 | status = acpi_ec_transaction_unlocked(ec, command, |
322 | wdata, wdata_len, | |
00eb43a1 LP |
323 | rdata, rdata_len, |
324 | force_poll); | |
1da177e4 | 325 | |
6ccedb10 | 326 | end: |
1da177e4 | 327 | |
703959d4 | 328 | if (ec->global_lock) |
1da177e4 | 329 | acpi_release_global_lock(glk); |
523953b4 | 330 | mutex_unlock(&ec->lock); |
1da177e4 | 331 | |
d550d98d | 332 | return status; |
1da177e4 LT |
333 | } |
334 | ||
c45aac43 AS |
335 | /* |
336 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
337 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
338 | */ | |
339 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
340 | { | |
341 | u8 d; | |
00eb43a1 | 342 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
343 | } |
344 | ||
345 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
346 | { | |
00eb43a1 | 347 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
348 | } |
349 | ||
6ccedb10 | 350 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
351 | { |
352 | int result; | |
353 | u8 d; | |
354 | ||
355 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 356 | &address, 1, &d, 1, 0); |
3576cf61 DS |
357 | *data = d; |
358 | return result; | |
359 | } | |
6ffb221a | 360 | |
3576cf61 DS |
361 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
362 | { | |
6ccedb10 AS |
363 | u8 wdata[2] = { address, data }; |
364 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 365 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
366 | } |
367 | ||
1da177e4 LT |
368 | /* |
369 | * Externally callable EC access functions. For now, assume 1 EC only | |
370 | */ | |
c45aac43 AS |
371 | int ec_burst_enable(void) |
372 | { | |
c45aac43 AS |
373 | if (!first_ec) |
374 | return -ENODEV; | |
d033879c | 375 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
376 | } |
377 | ||
378 | EXPORT_SYMBOL(ec_burst_enable); | |
379 | ||
380 | int ec_burst_disable(void) | |
381 | { | |
c45aac43 AS |
382 | if (!first_ec) |
383 | return -ENODEV; | |
d033879c | 384 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
385 | } |
386 | ||
387 | EXPORT_SYMBOL(ec_burst_disable); | |
388 | ||
6ccedb10 | 389 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 390 | { |
1da177e4 | 391 | int err; |
6ffb221a | 392 | u8 temp_data; |
1da177e4 LT |
393 | |
394 | if (!first_ec) | |
395 | return -ENODEV; | |
396 | ||
d033879c | 397 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
398 | |
399 | if (!err) { | |
400 | *val = temp_data; | |
401 | return 0; | |
50526df6 | 402 | } else |
1da177e4 LT |
403 | return err; |
404 | } | |
50526df6 | 405 | |
1da177e4 LT |
406 | EXPORT_SYMBOL(ec_read); |
407 | ||
50526df6 | 408 | int ec_write(u8 addr, u8 val) |
1da177e4 | 409 | { |
1da177e4 LT |
410 | int err; |
411 | ||
412 | if (!first_ec) | |
413 | return -ENODEV; | |
414 | ||
d033879c | 415 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
416 | |
417 | return err; | |
418 | } | |
50526df6 | 419 | |
1da177e4 LT |
420 | EXPORT_SYMBOL(ec_write); |
421 | ||
616362de | 422 | int ec_transaction(u8 command, |
9e197219 | 423 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
424 | u8 * rdata, unsigned rdata_len, |
425 | int force_poll) | |
45bea155 | 426 | { |
d7a76e4c LP |
427 | if (!first_ec) |
428 | return -ENODEV; | |
45bea155 | 429 | |
d033879c | 430 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
431 | wdata_len, rdata, rdata_len, |
432 | force_poll); | |
45bea155 | 433 | } |
1da177e4 | 434 | |
ab9e43c6 LP |
435 | EXPORT_SYMBOL(ec_transaction); |
436 | ||
6ccedb10 | 437 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
438 | { |
439 | int result; | |
6ccedb10 | 440 | u8 d; |
1da177e4 | 441 | |
6ccedb10 AS |
442 | if (!ec || !data) |
443 | return -EINVAL; | |
1da177e4 | 444 | |
6ccedb10 AS |
445 | /* |
446 | * Query the EC to find out which _Qxx method we need to evaluate. | |
447 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
448 | * bit to be cleared (and thus clearing the interrupt source). | |
449 | */ | |
716e084e | 450 | |
00eb43a1 | 451 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
452 | if (result) |
453 | return result; | |
1da177e4 | 454 | |
6ccedb10 AS |
455 | if (!d) |
456 | return -ENODATA; | |
1da177e4 | 457 | |
6ccedb10 AS |
458 | *data = d; |
459 | return 0; | |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | /* -------------------------------------------------------------------------- |
463 | Event Management | |
464 | -------------------------------------------------------------------------- */ | |
837012ed AS |
465 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
466 | acpi_handle handle, acpi_ec_query_func func, | |
467 | void *data) | |
468 | { | |
469 | struct acpi_ec_query_handler *handler = | |
470 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
471 | if (!handler) | |
472 | return -ENOMEM; | |
473 | ||
474 | handler->query_bit = query_bit; | |
475 | handler->handle = handle; | |
476 | handler->func = func; | |
477 | handler->data = data; | |
478 | mutex_lock(&ec->lock); | |
30c08574 | 479 | list_add(&handler->node, &ec->list); |
837012ed AS |
480 | mutex_unlock(&ec->lock); |
481 | return 0; | |
482 | } | |
483 | ||
484 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
485 | ||
486 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
487 | { | |
1544fdbc | 488 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 489 | mutex_lock(&ec->lock); |
1544fdbc | 490 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
491 | if (query_bit == handler->query_bit) { |
492 | list_del(&handler->node); | |
493 | kfree(handler); | |
837012ed AS |
494 | } |
495 | } | |
496 | mutex_unlock(&ec->lock); | |
497 | } | |
498 | ||
499 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 500 | |
50526df6 | 501 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 502 | { |
3d02b90b | 503 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 504 | u8 value = 0; |
837012ed | 505 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 506 | |
5d0c288b | 507 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 508 | return; |
837012ed AS |
509 | mutex_lock(&ec->lock); |
510 | list_for_each_entry(handler, &ec->list, node) { | |
511 | if (value == handler->query_bit) { | |
512 | /* have custom handler for this bit */ | |
513 | memcpy(©, handler, sizeof(copy)); | |
514 | mutex_unlock(&ec->lock); | |
515 | if (copy.func) { | |
516 | copy.func(copy.data); | |
517 | } else if (copy.handle) { | |
518 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
519 | } | |
520 | return; | |
521 | } | |
522 | } | |
523 | mutex_unlock(&ec->lock); | |
45bea155 | 524 | } |
1da177e4 | 525 | |
50526df6 | 526 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 527 | { |
50526df6 | 528 | acpi_status status = AE_OK; |
3d02b90b | 529 | struct acpi_ec *ec = data; |
00eb43a1 | 530 | |
3ebe08a7 | 531 | pr_debug(PREFIX "~~~> interrupt\n"); |
080e412c | 532 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
7843932a | 533 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) |
af3fd140 | 534 | wake_up(&ec->wait); |
451566f4 | 535 | |
080e412c AS |
536 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { |
537 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
538 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, | |
539 | acpi_ec_gpe_query, ec); | |
95b937e3 AS |
540 | } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { |
541 | /* this is non-query, must be confirmation */ | |
3ebe08a7 MN |
542 | if (printk_ratelimit()) |
543 | pr_info(PREFIX "non-query interrupt received," | |
544 | " switching to interrupt mode\n"); | |
7843932a | 545 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 546 | } |
e41334c0 | 547 | |
7843932a | 548 | return ACPI_SUCCESS(status) ? |
50526df6 | 549 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
550 | } |
551 | ||
552 | /* -------------------------------------------------------------------------- | |
553 | Address Space Management | |
554 | -------------------------------------------------------------------------- */ | |
555 | ||
556 | static acpi_status | |
50526df6 LB |
557 | acpi_ec_space_setup(acpi_handle region_handle, |
558 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
559 | { |
560 | /* | |
561 | * The EC object is in the handler context and is needed | |
562 | * when calling the acpi_ec_space_handler. | |
563 | */ | |
50526df6 LB |
564 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
565 | handler_context : NULL; | |
1da177e4 LT |
566 | |
567 | return AE_OK; | |
568 | } | |
569 | ||
1da177e4 | 570 | static acpi_status |
5b7734b4 AS |
571 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
572 | u32 bits, acpi_integer *value, | |
50526df6 | 573 | void *handler_context, void *region_context) |
1da177e4 | 574 | { |
3d02b90b | 575 | struct acpi_ec *ec = handler_context; |
3e71a87d | 576 | int result = 0, i; |
5b7734b4 | 577 | u8 temp = 0; |
1da177e4 | 578 | |
1da177e4 | 579 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 580 | return AE_BAD_PARAMETER; |
1da177e4 | 581 | |
5b7734b4 | 582 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 583 | return AE_BAD_PARAMETER; |
1da177e4 | 584 | |
5b7734b4 AS |
585 | if (bits != 8 && acpi_strict) |
586 | return AE_BAD_PARAMETER; | |
1da177e4 | 587 | |
b3b233c7 AS |
588 | acpi_ec_burst_enable(ec); |
589 | ||
3e71a87d AS |
590 | if (function == ACPI_READ) { |
591 | result = acpi_ec_read(ec, address, &temp); | |
592 | *value = temp; | |
593 | } else { | |
594 | temp = 0xff & (*value); | |
595 | result = acpi_ec_write(ec, address, temp); | |
596 | } | |
597 | ||
598 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
599 | ++address; | |
5b7734b4 AS |
600 | if (function == ACPI_READ) { |
601 | result = acpi_ec_read(ec, address, &temp); | |
602 | (*value) |= ((acpi_integer)temp) << i; | |
603 | } else { | |
604 | temp = 0xff & ((*value) >> i); | |
605 | result = acpi_ec_write(ec, address, temp); | |
606 | } | |
1da177e4 LT |
607 | } |
608 | ||
b3b233c7 AS |
609 | acpi_ec_burst_disable(ec); |
610 | ||
1da177e4 LT |
611 | switch (result) { |
612 | case -EINVAL: | |
d550d98d | 613 | return AE_BAD_PARAMETER; |
1da177e4 LT |
614 | break; |
615 | case -ENODEV: | |
d550d98d | 616 | return AE_NOT_FOUND; |
1da177e4 LT |
617 | break; |
618 | case -ETIME: | |
d550d98d | 619 | return AE_TIME; |
1da177e4 LT |
620 | break; |
621 | default: | |
d550d98d | 622 | return AE_OK; |
1da177e4 | 623 | } |
1da177e4 LT |
624 | } |
625 | ||
1da177e4 LT |
626 | /* -------------------------------------------------------------------------- |
627 | FS Interface (/proc) | |
628 | -------------------------------------------------------------------------- */ | |
629 | ||
50526df6 | 630 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 631 | |
50526df6 | 632 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 633 | { |
3d02b90b | 634 | struct acpi_ec *ec = seq->private; |
1da177e4 | 635 | |
1da177e4 LT |
636 | if (!ec) |
637 | goto end; | |
638 | ||
01f22462 AS |
639 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
640 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
641 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
642 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 643 | ec->global_lock ? "yes" : "no"); |
50526df6 | 644 | end: |
d550d98d | 645 | return 0; |
1da177e4 LT |
646 | } |
647 | ||
648 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
649 | { | |
650 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
651 | } | |
652 | ||
703959d4 | 653 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
654 | .open = acpi_ec_info_open_fs, |
655 | .read = seq_read, | |
656 | .llseek = seq_lseek, | |
657 | .release = single_release, | |
1da177e4 LT |
658 | .owner = THIS_MODULE, |
659 | }; | |
660 | ||
50526df6 | 661 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 662 | { |
50526df6 | 663 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 664 | |
1da177e4 LT |
665 | if (!acpi_device_dir(device)) { |
666 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 667 | acpi_ec_dir); |
1da177e4 | 668 | if (!acpi_device_dir(device)) |
d550d98d | 669 | return -ENODEV; |
1da177e4 LT |
670 | } |
671 | ||
672 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 673 | acpi_device_dir(device)); |
1da177e4 | 674 | if (!entry) |
d550d98d | 675 | return -ENODEV; |
1da177e4 LT |
676 | else { |
677 | entry->proc_fops = &acpi_ec_info_ops; | |
678 | entry->data = acpi_driver_data(device); | |
679 | entry->owner = THIS_MODULE; | |
680 | } | |
681 | ||
d550d98d | 682 | return 0; |
1da177e4 LT |
683 | } |
684 | ||
50526df6 | 685 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 686 | { |
1da177e4 LT |
687 | |
688 | if (acpi_device_dir(device)) { | |
689 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
690 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
691 | acpi_device_dir(device) = NULL; | |
692 | } | |
693 | ||
d550d98d | 694 | return 0; |
1da177e4 LT |
695 | } |
696 | ||
1da177e4 LT |
697 | /* -------------------------------------------------------------------------- |
698 | Driver Interface | |
699 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
700 | static acpi_status |
701 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
702 | ||
c0900c35 AS |
703 | static struct acpi_ec *make_acpi_ec(void) |
704 | { | |
705 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
706 | if (!ec) | |
707 | return NULL; | |
080e412c | 708 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
709 | mutex_init(&ec->lock); |
710 | init_waitqueue_head(&ec->wait); | |
837012ed | 711 | INIT_LIST_HEAD(&ec->list); |
c0900c35 AS |
712 | return ec; |
713 | } | |
837012ed | 714 | |
c019b193 AS |
715 | static acpi_status |
716 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
717 | void *context, void **return_value) | |
718 | { | |
719 | struct acpi_namespace_node *node = handle; | |
720 | struct acpi_ec *ec = context; | |
721 | int value = 0; | |
722 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
723 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
724 | } | |
725 | return AE_OK; | |
726 | } | |
727 | ||
cd8c93a4 AS |
728 | static acpi_status |
729 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 730 | { |
cd8c93a4 AS |
731 | acpi_status status; |
732 | ||
733 | struct acpi_ec *ec = context; | |
734 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
735 | ec_parse_io_ports, ec); | |
736 | if (ACPI_FAILURE(status)) | |
737 | return status; | |
837012ed AS |
738 | |
739 | /* Get GPE bit assignment (EC events). */ | |
740 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
741 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
742 | if (ACPI_FAILURE(status)) | |
743 | return status; | |
c019b193 AS |
744 | /* Find and register all query methods */ |
745 | acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, | |
746 | acpi_ec_register_query_methods, ec, NULL); | |
837012ed AS |
747 | /* Use the global lock for all EC transactions? */ |
748 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 749 | ec->handle = handle; |
cd8c93a4 | 750 | return AE_CTRL_TERMINATE; |
837012ed AS |
751 | } |
752 | ||
4c611060 AS |
753 | static void ec_remove_handlers(struct acpi_ec *ec) |
754 | { | |
755 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
756 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 757 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
758 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
759 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 760 | pr_err(PREFIX "failed to remove gpe handler\n"); |
4c611060 AS |
761 | ec->handlers_installed = 0; |
762 | } | |
763 | ||
703959d4 | 764 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 765 | { |
703959d4 | 766 | struct acpi_ec *ec = NULL; |
45bea155 | 767 | |
45bea155 | 768 | if (!device) |
d550d98d | 769 | return -EINVAL; |
c0900c35 AS |
770 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
771 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
772 | ||
4c611060 AS |
773 | /* Check for boot EC */ |
774 | if (boot_ec) { | |
775 | if (boot_ec->handle == device->handle) { | |
776 | /* Pre-loaded EC from DSDT, just move pointer */ | |
777 | ec = boot_ec; | |
778 | boot_ec = NULL; | |
779 | goto end; | |
780 | } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { | |
781 | /* ECDT-based EC, time to shut it down */ | |
782 | ec_remove_handlers(boot_ec); | |
783 | kfree(boot_ec); | |
784 | first_ec = boot_ec = NULL; | |
785 | } | |
786 | } | |
787 | ||
c0900c35 | 788 | ec = make_acpi_ec(); |
45bea155 | 789 | if (!ec) |
d550d98d | 790 | return -ENOMEM; |
703959d4 | 791 | |
cd8c93a4 AS |
792 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
793 | AE_CTRL_TERMINATE) { | |
c0900c35 AS |
794 | kfree(ec); |
795 | return -EINVAL; | |
45bea155 | 796 | } |
c0900c35 | 797 | ec->handle = device->handle; |
4c611060 AS |
798 | end: |
799 | if (!first_ec) | |
800 | first_ec = ec; | |
c0900c35 | 801 | acpi_driver_data(device) = ec; |
c0900c35 | 802 | acpi_ec_add_fs(device); |
3ebe08a7 | 803 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 804 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 805 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 806 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 807 | return 0; |
1da177e4 LT |
808 | } |
809 | ||
50526df6 | 810 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 811 | { |
01f22462 | 812 | struct acpi_ec *ec; |
07ddf768 | 813 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 814 | |
1da177e4 | 815 | if (!device) |
d550d98d | 816 | return -EINVAL; |
1da177e4 LT |
817 | |
818 | ec = acpi_driver_data(device); | |
837012ed | 819 | mutex_lock(&ec->lock); |
07ddf768 | 820 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
821 | list_del(&handler->node); |
822 | kfree(handler); | |
823 | } | |
824 | mutex_unlock(&ec->lock); | |
1da177e4 | 825 | acpi_ec_remove_fs(device); |
c0900c35 | 826 | acpi_driver_data(device) = NULL; |
d033879c | 827 | if (ec == first_ec) |
c0900c35 | 828 | first_ec = NULL; |
4c611060 | 829 | kfree(ec); |
d550d98d | 830 | return 0; |
1da177e4 LT |
831 | } |
832 | ||
1da177e4 | 833 | static acpi_status |
c0900c35 | 834 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 835 | { |
3d02b90b | 836 | struct acpi_ec *ec = context; |
1da177e4 | 837 | |
01f22462 | 838 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 839 | return AE_OK; |
1da177e4 LT |
840 | |
841 | /* | |
842 | * The first address region returned is the data port, and | |
843 | * the second address region returned is the status/command | |
844 | * port. | |
845 | */ | |
01f22462 | 846 | if (ec->data_addr == 0) |
6ffb221a | 847 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 848 | else if (ec->command_addr == 0) |
6ffb221a | 849 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 850 | else |
1da177e4 | 851 | return AE_CTRL_TERMINATE; |
1da177e4 | 852 | |
1da177e4 LT |
853 | return AE_OK; |
854 | } | |
855 | ||
e8284321 AS |
856 | static int ec_install_handlers(struct acpi_ec *ec) |
857 | { | |
c0900c35 | 858 | acpi_status status; |
4c611060 AS |
859 | if (ec->handlers_installed) |
860 | return 0; | |
c0900c35 AS |
861 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
862 | ACPI_GPE_EDGE_TRIGGERED, | |
863 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
864 | if (ACPI_FAILURE(status)) |
865 | return -ENODEV; | |
01f22462 | 866 | |
e8284321 AS |
867 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
868 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
869 | ||
870 | status = acpi_install_address_space_handler(ec->handle, | |
871 | ACPI_ADR_SPACE_EC, | |
872 | &acpi_ec_space_handler, | |
873 | &acpi_ec_space_setup, ec); | |
874 | if (ACPI_FAILURE(status)) { | |
875 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
876 | return -ENODEV; | |
877 | } | |
878 | ||
4c611060 | 879 | ec->handlers_installed = 1; |
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 | { | |
918 | if (!boot_ec || boot_ec->handlers_installed) | |
919 | return 0; | |
920 | if (!ec_install_handlers(boot_ec)) { | |
921 | first_ec = boot_ec; | |
922 | return 0; | |
923 | } | |
924 | return -EFAULT; | |
925 | } | |
926 | ||
c0900c35 AS |
927 | int __init acpi_ec_ecdt_probe(void) |
928 | { | |
929 | int ret; | |
930 | acpi_status status; | |
50526df6 | 931 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 932 | |
d66d969d AS |
933 | boot_ec = make_acpi_ec(); |
934 | if (!boot_ec) | |
c0900c35 AS |
935 | return -ENOMEM; |
936 | /* | |
937 | * Generate a boot ec context | |
938 | */ | |
15a58ed1 AS |
939 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
940 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 941 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 942 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
943 | boot_ec->command_addr = ecdt_ptr->control.address; |
944 | boot_ec->data_addr = ecdt_ptr->data.address; | |
945 | boot_ec->gpe = ecdt_ptr->gpe; | |
208c70a4 AS |
946 | if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id, |
947 | &boot_ec->handle))) { | |
948 | pr_info("Failed to locate handle for boot EC\n"); | |
949 | boot_ec->handle = ACPI_ROOT_OBJECT; | |
950 | } | |
cd8c93a4 | 951 | } else { |
5870a8cd AS |
952 | /* This workaround is needed only on some broken machines, |
953 | * which require early EC, but fail to provide ECDT */ | |
954 | acpi_handle x; | |
cd8c93a4 AS |
955 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
956 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
957 | boot_ec, NULL); | |
2d8348b4 AS |
958 | /* Check that acpi_get_devices actually find something */ |
959 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 960 | goto error; |
5870a8cd AS |
961 | /* We really need to limit this workaround, the only ASUS, |
962 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 963 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
964 | */ |
965 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 966 | return -ENODEV; |
cd8c93a4 | 967 | } |
1da177e4 | 968 | |
d66d969d | 969 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
970 | if (!ret) { |
971 | first_ec = boot_ec; | |
e8284321 | 972 | return 0; |
d033879c | 973 | } |
c0900c35 | 974 | error: |
d66d969d AS |
975 | kfree(boot_ec); |
976 | boot_ec = NULL; | |
1da177e4 LT |
977 | return -ENODEV; |
978 | } | |
979 | ||
50526df6 | 980 | static int __init acpi_ec_init(void) |
1da177e4 | 981 | { |
50526df6 | 982 | int result = 0; |
1da177e4 | 983 | |
1da177e4 | 984 | if (acpi_disabled) |
d550d98d | 985 | return 0; |
1da177e4 LT |
986 | |
987 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
988 | if (!acpi_ec_dir) | |
d550d98d | 989 | return -ENODEV; |
1da177e4 LT |
990 | |
991 | /* Now register the driver for the EC */ | |
992 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
993 | if (result < 0) { | |
994 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 995 | return -ENODEV; |
1da177e4 LT |
996 | } |
997 | ||
d550d98d | 998 | return result; |
1da177e4 LT |
999 | } |
1000 | ||
1001 | subsys_initcall(acpi_ec_init); | |
1002 | ||
1003 | /* EC driver currently not unloadable */ | |
1004 | #if 0 | |
50526df6 | 1005 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1006 | { |
1da177e4 LT |
1007 | |
1008 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1009 | ||
1010 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1011 | ||
d550d98d | 1012 | return; |
1da177e4 | 1013 | } |
7843932a | 1014 | #endif /* 0 */ |