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 */ |
e6e82a30 | 76 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
703959d4 | 77 | |
080e412c AS |
78 | enum { |
79 | EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ | |
80 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ | |
7843932a | 81 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ |
f2d68935 AS |
82 | EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ |
83 | EC_FLAGS_ADDRESS, /* Address is being written */ | |
e790cc8b AS |
84 | EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */ |
85 | EC_FLAGS_WDATA, /* Data is being written */ | |
03d1d99c | 86 | EC_FLAGS_NO_OBF1_GPE, /* Don't expect GPE before read */ |
080e412c AS |
87 | }; |
88 | ||
50526df6 LB |
89 | static int acpi_ec_remove(struct acpi_device *device, int type); |
90 | static int acpi_ec_start(struct acpi_device *device); | |
91 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 92 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 | 93 | |
1ba90e3a TR |
94 | static const struct acpi_device_id ec_device_ids[] = { |
95 | {"PNP0C09", 0}, | |
96 | {"", 0}, | |
97 | }; | |
98 | ||
1da177e4 | 99 | static struct acpi_driver acpi_ec_driver = { |
c2b6705b | 100 | .name = "ec", |
50526df6 | 101 | .class = ACPI_EC_CLASS, |
1ba90e3a | 102 | .ids = ec_device_ids, |
50526df6 | 103 | .ops = { |
703959d4 | 104 | .add = acpi_ec_add, |
50526df6 LB |
105 | .remove = acpi_ec_remove, |
106 | .start = acpi_ec_start, | |
107 | .stop = acpi_ec_stop, | |
108 | }, | |
1da177e4 | 109 | }; |
6ffb221a DS |
110 | |
111 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 112 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
113 | typedef int (*acpi_ec_query_func) (void *data); |
114 | ||
115 | struct acpi_ec_query_handler { | |
116 | struct list_head node; | |
117 | acpi_ec_query_func func; | |
118 | acpi_handle handle; | |
119 | void *data; | |
120 | u8 query_bit; | |
121 | }; | |
122 | ||
a854e08a | 123 | static struct acpi_ec { |
703959d4 | 124 | acpi_handle handle; |
a86e2772 | 125 | unsigned long gpe; |
6ffb221a DS |
126 | unsigned long command_addr; |
127 | unsigned long data_addr; | |
703959d4 | 128 | unsigned long global_lock; |
080e412c | 129 | unsigned long flags; |
c787a855 | 130 | struct mutex lock; |
703959d4 | 131 | wait_queue_head_t wait; |
837012ed | 132 | struct list_head list; |
4c611060 | 133 | u8 handlers_installed; |
d033879c | 134 | } *boot_ec, *first_ec; |
703959d4 | 135 | |
1da177e4 LT |
136 | /* -------------------------------------------------------------------------- |
137 | Transaction Management | |
138 | -------------------------------------------------------------------------- */ | |
139 | ||
6ffb221a | 140 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 141 | { |
3ebe08a7 | 142 | u8 x = inb(ec->command_addr); |
86dae015 | 143 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 144 | return x; |
451566f4 DT |
145 | } |
146 | ||
6ffb221a | 147 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 148 | { |
3ebe08a7 | 149 | u8 x = inb(ec->data_addr); |
86dae015 | 150 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
6ffb221a | 151 | return inb(ec->data_addr); |
7c6db5e5 DS |
152 | } |
153 | ||
6ffb221a | 154 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 155 | { |
86dae015 | 156 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 157 | outb(command, ec->command_addr); |
45bea155 LY |
158 | } |
159 | ||
6ffb221a | 160 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 161 | { |
86dae015 | 162 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 163 | outb(data, ec->data_addr); |
703959d4 | 164 | } |
45bea155 | 165 | |
080e412c | 166 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 167 | { |
080e412c | 168 | if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags)) |
9e197219 | 169 | return 0; |
78d0af33 | 170 | if (event == ACPI_EC_EVENT_OBF_1) { |
080e412c | 171 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
703959d4 | 172 | return 1; |
78d0af33 | 173 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
080e412c | 174 | if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)) |
703959d4 | 175 | return 1; |
45bea155 LY |
176 | } |
177 | ||
703959d4 | 178 | return 0; |
45bea155 | 179 | } |
451566f4 | 180 | |
080e412c | 181 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) |
7c6db5e5 | 182 | { |
f2d68935 | 183 | int ret = 0; |
03d1d99c AS |
184 | |
185 | if (unlikely(event == ACPI_EC_EVENT_OBF_1 && | |
186 | test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags))) | |
187 | force_poll = 1; | |
f2d68935 AS |
188 | if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && |
189 | test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) | |
190 | force_poll = 1; | |
e790cc8b AS |
191 | if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) && |
192 | test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags))) | |
193 | force_poll = 1; | |
7843932a AS |
194 | if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && |
195 | likely(!force_poll)) { | |
080e412c AS |
196 | if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), |
197 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
f2d68935 | 198 | goto end; |
080e412c AS |
199 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
200 | if (acpi_ec_check_status(ec, event)) { | |
03d1d99c AS |
201 | if (event == ACPI_EC_EVENT_OBF_1) { |
202 | /* miss OBF_1 GPE, don't expect it */ | |
203 | pr_info(PREFIX "missing OBF confirmation, " | |
204 | "don't expect it any longer.\n"); | |
205 | set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags); | |
206 | } else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { | |
f2d68935 | 207 | /* miss address GPE, don't expect it anymore */ |
e790cc8b | 208 | pr_info(PREFIX "missing address confirmation, " |
f2d68935 AS |
209 | "don't expect it any longer.\n"); |
210 | set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); | |
e790cc8b AS |
211 | } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) { |
212 | /* miss write data GPE, don't expect it */ | |
213 | pr_info(PREFIX "missing write data confirmation, " | |
214 | "don't expect it any longer.\n"); | |
215 | set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags); | |
95b937e3 | 216 | } else { |
66c5f4e7 | 217 | /* missing GPEs, switch back to poll mode */ |
3ebe08a7 | 218 | if (printk_ratelimit()) |
e790cc8b | 219 | pr_info(PREFIX "missing confirmations, " |
3ebe08a7 | 220 | "switch off interrupt mode.\n"); |
66c5f4e7 | 221 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 222 | } |
f2d68935 | 223 | goto end; |
703959d4 | 224 | } |
7843932a AS |
225 | } else { |
226 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
227 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
228 | while (time_before(jiffies, delay)) { | |
229 | if (acpi_ec_check_status(ec, event)) | |
f2d68935 | 230 | goto end; |
e6e82a30 | 231 | udelay(ACPI_EC_UDELAY); |
7843932a | 232 | } |
af3fd140 | 233 | } |
3ebe08a7 | 234 | pr_err(PREFIX "acpi_ec_wait timeout," |
080e412c AS |
235 | " status = %d, expect_event = %d\n", |
236 | acpi_ec_read_status(ec), event); | |
f2d68935 AS |
237 | ret = -ETIME; |
238 | end: | |
239 | clear_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
240 | return ret; | |
1da177e4 LT |
241 | } |
242 | ||
703959d4 | 243 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 | 244 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
245 | u8 * rdata, unsigned rdata_len, |
246 | int force_poll) | |
45bea155 | 247 | { |
af3fd140 | 248 | int result = 0; |
080e412c | 249 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 250 | acpi_ec_write_cmd(ec, command); |
3ebe08a7 | 251 | pr_debug(PREFIX "transaction start\n"); |
78d0af33 | 252 | for (; wdata_len > 0; --wdata_len) { |
080e412c | 253 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 254 | if (result) { |
3ebe08a7 | 255 | pr_err(PREFIX |
6ccedb10 | 256 | "write_cmd timeout, command = %d\n", command); |
af3fd140 AS |
257 | goto end; |
258 | } | |
f2d68935 AS |
259 | /* mark the address byte written to EC */ |
260 | if (rdata_len + wdata_len > 1) | |
261 | set_bit(EC_FLAGS_ADDRESS, &ec->flags); | |
080e412c | 262 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
703959d4 | 263 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 264 | } |
45bea155 | 265 | |
d91df1aa | 266 | if (!rdata_len) { |
e790cc8b | 267 | set_bit(EC_FLAGS_WDATA, &ec->flags); |
080e412c | 268 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); |
af3fd140 | 269 | if (result) { |
3ebe08a7 | 270 | pr_err(PREFIX |
6ccedb10 | 271 | "finish-write timeout, command = %d\n", command); |
af3fd140 AS |
272 | goto end; |
273 | } | |
080e412c AS |
274 | } else if (command == ACPI_EC_COMMAND_QUERY) |
275 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
45bea155 | 276 | |
78d0af33 | 277 | for (; rdata_len > 0; --rdata_len) { |
080e412c | 278 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); |
af3fd140 | 279 | if (result) { |
3ebe08a7 | 280 | pr_err(PREFIX "read timeout, command = %d\n", command); |
af3fd140 AS |
281 | goto end; |
282 | } | |
0c5d31f4 AS |
283 | /* Don't expect GPE after last read */ |
284 | if (rdata_len > 1) | |
285 | set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); | |
6ffb221a | 286 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 287 | } |
af3fd140 | 288 | end: |
3ebe08a7 | 289 | pr_debug(PREFIX "transaction end\n"); |
af3fd140 | 290 | return result; |
45bea155 LY |
291 | } |
292 | ||
3576cf61 | 293 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 | 294 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
295 | u8 * rdata, unsigned rdata_len, |
296 | int force_poll) | |
1da177e4 | 297 | { |
d7a76e4c | 298 | int status; |
50526df6 | 299 | u32 glk; |
1da177e4 | 300 | |
d7a76e4c | 301 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 302 | return -EINVAL; |
1da177e4 | 303 | |
6ccedb10 AS |
304 | if (rdata) |
305 | memset(rdata, 0, rdata_len); | |
1da177e4 | 306 | |
523953b4 | 307 | mutex_lock(&ec->lock); |
703959d4 | 308 | if (ec->global_lock) { |
1da177e4 | 309 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
310 | if (ACPI_FAILURE(status)) { |
311 | mutex_unlock(&ec->lock); | |
d550d98d | 312 | return -ENODEV; |
c24e912b | 313 | } |
1da177e4 | 314 | } |
451566f4 | 315 | |
080e412c | 316 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 317 | if (status) { |
3ebe08a7 MN |
318 | pr_err(PREFIX "input buffer is not empty, " |
319 | "aborting transaction\n"); | |
451566f4 | 320 | goto end; |
716e084e | 321 | } |
1da177e4 | 322 | |
6ccedb10 AS |
323 | status = acpi_ec_transaction_unlocked(ec, command, |
324 | wdata, wdata_len, | |
00eb43a1 LP |
325 | rdata, rdata_len, |
326 | force_poll); | |
1da177e4 | 327 | |
6ccedb10 | 328 | end: |
1da177e4 | 329 | |
703959d4 | 330 | if (ec->global_lock) |
1da177e4 | 331 | acpi_release_global_lock(glk); |
523953b4 | 332 | mutex_unlock(&ec->lock); |
1da177e4 | 333 | |
d550d98d | 334 | return status; |
1da177e4 LT |
335 | } |
336 | ||
c45aac43 AS |
337 | /* |
338 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
339 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
340 | */ | |
341 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
342 | { | |
343 | u8 d; | |
00eb43a1 | 344 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0); |
c45aac43 AS |
345 | } |
346 | ||
347 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
348 | { | |
00eb43a1 | 349 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0); |
c45aac43 AS |
350 | } |
351 | ||
6ccedb10 | 352 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
353 | { |
354 | int result; | |
355 | u8 d; | |
356 | ||
357 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
00eb43a1 | 358 | &address, 1, &d, 1, 0); |
3576cf61 DS |
359 | *data = d; |
360 | return result; | |
361 | } | |
6ffb221a | 362 | |
3576cf61 DS |
363 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
364 | { | |
6ccedb10 AS |
365 | u8 wdata[2] = { address, data }; |
366 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
00eb43a1 | 367 | wdata, 2, NULL, 0, 0); |
3576cf61 DS |
368 | } |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Externally callable EC access functions. For now, assume 1 EC only | |
372 | */ | |
c45aac43 AS |
373 | int ec_burst_enable(void) |
374 | { | |
c45aac43 AS |
375 | if (!first_ec) |
376 | return -ENODEV; | |
d033879c | 377 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
378 | } |
379 | ||
380 | EXPORT_SYMBOL(ec_burst_enable); | |
381 | ||
382 | int ec_burst_disable(void) | |
383 | { | |
c45aac43 AS |
384 | if (!first_ec) |
385 | return -ENODEV; | |
d033879c | 386 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
387 | } |
388 | ||
389 | EXPORT_SYMBOL(ec_burst_disable); | |
390 | ||
6ccedb10 | 391 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 392 | { |
1da177e4 | 393 | int err; |
6ffb221a | 394 | u8 temp_data; |
1da177e4 LT |
395 | |
396 | if (!first_ec) | |
397 | return -ENODEV; | |
398 | ||
d033879c | 399 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
400 | |
401 | if (!err) { | |
402 | *val = temp_data; | |
403 | return 0; | |
50526df6 | 404 | } else |
1da177e4 LT |
405 | return err; |
406 | } | |
50526df6 | 407 | |
1da177e4 LT |
408 | EXPORT_SYMBOL(ec_read); |
409 | ||
50526df6 | 410 | int ec_write(u8 addr, u8 val) |
1da177e4 | 411 | { |
1da177e4 LT |
412 | int err; |
413 | ||
414 | if (!first_ec) | |
415 | return -ENODEV; | |
416 | ||
d033879c | 417 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
418 | |
419 | return err; | |
420 | } | |
50526df6 | 421 | |
1da177e4 LT |
422 | EXPORT_SYMBOL(ec_write); |
423 | ||
616362de | 424 | int ec_transaction(u8 command, |
9e197219 | 425 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
426 | u8 * rdata, unsigned rdata_len, |
427 | int force_poll) | |
45bea155 | 428 | { |
d7a76e4c LP |
429 | if (!first_ec) |
430 | return -ENODEV; | |
45bea155 | 431 | |
d033879c | 432 | return acpi_ec_transaction(first_ec, command, wdata, |
00eb43a1 LP |
433 | wdata_len, rdata, rdata_len, |
434 | force_poll); | |
45bea155 | 435 | } |
1da177e4 | 436 | |
ab9e43c6 LP |
437 | EXPORT_SYMBOL(ec_transaction); |
438 | ||
6ccedb10 | 439 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
440 | { |
441 | int result; | |
6ccedb10 | 442 | u8 d; |
1da177e4 | 443 | |
6ccedb10 AS |
444 | if (!ec || !data) |
445 | return -EINVAL; | |
1da177e4 | 446 | |
6ccedb10 AS |
447 | /* |
448 | * Query the EC to find out which _Qxx method we need to evaluate. | |
449 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
450 | * bit to be cleared (and thus clearing the interrupt source). | |
451 | */ | |
716e084e | 452 | |
00eb43a1 | 453 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0); |
6ccedb10 AS |
454 | if (result) |
455 | return result; | |
1da177e4 | 456 | |
6ccedb10 AS |
457 | if (!d) |
458 | return -ENODATA; | |
1da177e4 | 459 | |
6ccedb10 AS |
460 | *data = d; |
461 | return 0; | |
1da177e4 LT |
462 | } |
463 | ||
1da177e4 LT |
464 | /* -------------------------------------------------------------------------- |
465 | Event Management | |
466 | -------------------------------------------------------------------------- */ | |
837012ed AS |
467 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
468 | acpi_handle handle, acpi_ec_query_func func, | |
469 | void *data) | |
470 | { | |
471 | struct acpi_ec_query_handler *handler = | |
472 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
473 | if (!handler) | |
474 | return -ENOMEM; | |
475 | ||
476 | handler->query_bit = query_bit; | |
477 | handler->handle = handle; | |
478 | handler->func = func; | |
479 | handler->data = data; | |
480 | mutex_lock(&ec->lock); | |
30c08574 | 481 | list_add(&handler->node, &ec->list); |
837012ed AS |
482 | mutex_unlock(&ec->lock); |
483 | return 0; | |
484 | } | |
485 | ||
486 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
487 | ||
488 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
489 | { | |
1544fdbc | 490 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 491 | mutex_lock(&ec->lock); |
1544fdbc | 492 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
493 | if (query_bit == handler->query_bit) { |
494 | list_del(&handler->node); | |
495 | kfree(handler); | |
837012ed AS |
496 | } |
497 | } | |
498 | mutex_unlock(&ec->lock); | |
499 | } | |
500 | ||
501 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 502 | |
50526df6 | 503 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 504 | { |
3d02b90b | 505 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 506 | u8 value = 0; |
837012ed | 507 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 508 | |
5d0c288b | 509 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 510 | return; |
837012ed AS |
511 | mutex_lock(&ec->lock); |
512 | list_for_each_entry(handler, &ec->list, node) { | |
513 | if (value == handler->query_bit) { | |
514 | /* have custom handler for this bit */ | |
515 | memcpy(©, handler, sizeof(copy)); | |
516 | mutex_unlock(&ec->lock); | |
517 | if (copy.func) { | |
518 | copy.func(copy.data); | |
519 | } else if (copy.handle) { | |
520 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
521 | } | |
522 | return; | |
523 | } | |
524 | } | |
525 | mutex_unlock(&ec->lock); | |
45bea155 | 526 | } |
1da177e4 | 527 | |
50526df6 | 528 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 529 | { |
50526df6 | 530 | acpi_status status = AE_OK; |
3d02b90b | 531 | struct acpi_ec *ec = data; |
00eb43a1 | 532 | |
3ebe08a7 | 533 | pr_debug(PREFIX "~~~> interrupt\n"); |
080e412c | 534 | clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); |
7843932a | 535 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) |
af3fd140 | 536 | wake_up(&ec->wait); |
451566f4 | 537 | |
080e412c AS |
538 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { |
539 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
540 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, | |
541 | acpi_ec_gpe_query, ec); | |
95b937e3 AS |
542 | } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { |
543 | /* this is non-query, must be confirmation */ | |
3ebe08a7 MN |
544 | if (printk_ratelimit()) |
545 | pr_info(PREFIX "non-query interrupt received," | |
546 | " switching to interrupt mode\n"); | |
7843932a | 547 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 548 | } |
e41334c0 | 549 | |
7843932a | 550 | return ACPI_SUCCESS(status) ? |
50526df6 | 551 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
552 | } |
553 | ||
554 | /* -------------------------------------------------------------------------- | |
555 | Address Space Management | |
556 | -------------------------------------------------------------------------- */ | |
557 | ||
558 | static acpi_status | |
50526df6 LB |
559 | acpi_ec_space_setup(acpi_handle region_handle, |
560 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
561 | { |
562 | /* | |
563 | * The EC object is in the handler context and is needed | |
564 | * when calling the acpi_ec_space_handler. | |
565 | */ | |
50526df6 LB |
566 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
567 | handler_context : NULL; | |
1da177e4 LT |
568 | |
569 | return AE_OK; | |
570 | } | |
571 | ||
1da177e4 | 572 | static acpi_status |
5b7734b4 AS |
573 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
574 | u32 bits, acpi_integer *value, | |
50526df6 | 575 | void *handler_context, void *region_context) |
1da177e4 | 576 | { |
3d02b90b | 577 | struct acpi_ec *ec = handler_context; |
3e71a87d | 578 | int result = 0, i; |
5b7734b4 | 579 | u8 temp = 0; |
1da177e4 | 580 | |
1da177e4 | 581 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 582 | return AE_BAD_PARAMETER; |
1da177e4 | 583 | |
5b7734b4 | 584 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 585 | return AE_BAD_PARAMETER; |
1da177e4 | 586 | |
5b7734b4 AS |
587 | if (bits != 8 && acpi_strict) |
588 | return AE_BAD_PARAMETER; | |
1da177e4 | 589 | |
b3b233c7 AS |
590 | acpi_ec_burst_enable(ec); |
591 | ||
3e71a87d AS |
592 | if (function == ACPI_READ) { |
593 | result = acpi_ec_read(ec, address, &temp); | |
594 | *value = temp; | |
595 | } else { | |
596 | temp = 0xff & (*value); | |
597 | result = acpi_ec_write(ec, address, temp); | |
598 | } | |
599 | ||
600 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
601 | ++address; | |
5b7734b4 AS |
602 | if (function == ACPI_READ) { |
603 | result = acpi_ec_read(ec, address, &temp); | |
604 | (*value) |= ((acpi_integer)temp) << i; | |
605 | } else { | |
606 | temp = 0xff & ((*value) >> i); | |
607 | result = acpi_ec_write(ec, address, temp); | |
608 | } | |
1da177e4 LT |
609 | } |
610 | ||
b3b233c7 AS |
611 | acpi_ec_burst_disable(ec); |
612 | ||
1da177e4 LT |
613 | switch (result) { |
614 | case -EINVAL: | |
d550d98d | 615 | return AE_BAD_PARAMETER; |
1da177e4 LT |
616 | break; |
617 | case -ENODEV: | |
d550d98d | 618 | return AE_NOT_FOUND; |
1da177e4 LT |
619 | break; |
620 | case -ETIME: | |
d550d98d | 621 | return AE_TIME; |
1da177e4 LT |
622 | break; |
623 | default: | |
d550d98d | 624 | return AE_OK; |
1da177e4 | 625 | } |
1da177e4 LT |
626 | } |
627 | ||
1da177e4 LT |
628 | /* -------------------------------------------------------------------------- |
629 | FS Interface (/proc) | |
630 | -------------------------------------------------------------------------- */ | |
631 | ||
50526df6 | 632 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 633 | |
50526df6 | 634 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 635 | { |
3d02b90b | 636 | struct acpi_ec *ec = seq->private; |
1da177e4 | 637 | |
1da177e4 LT |
638 | if (!ec) |
639 | goto end; | |
640 | ||
01f22462 AS |
641 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
642 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
643 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
644 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 645 | ec->global_lock ? "yes" : "no"); |
50526df6 | 646 | end: |
d550d98d | 647 | return 0; |
1da177e4 LT |
648 | } |
649 | ||
650 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
651 | { | |
652 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
653 | } | |
654 | ||
703959d4 | 655 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
656 | .open = acpi_ec_info_open_fs, |
657 | .read = seq_read, | |
658 | .llseek = seq_lseek, | |
659 | .release = single_release, | |
1da177e4 LT |
660 | .owner = THIS_MODULE, |
661 | }; | |
662 | ||
50526df6 | 663 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 664 | { |
50526df6 | 665 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 666 | |
1da177e4 LT |
667 | if (!acpi_device_dir(device)) { |
668 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 669 | acpi_ec_dir); |
1da177e4 | 670 | if (!acpi_device_dir(device)) |
d550d98d | 671 | return -ENODEV; |
1da177e4 LT |
672 | } |
673 | ||
674 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 675 | acpi_device_dir(device)); |
1da177e4 | 676 | if (!entry) |
d550d98d | 677 | return -ENODEV; |
1da177e4 LT |
678 | else { |
679 | entry->proc_fops = &acpi_ec_info_ops; | |
680 | entry->data = acpi_driver_data(device); | |
681 | entry->owner = THIS_MODULE; | |
682 | } | |
683 | ||
d550d98d | 684 | return 0; |
1da177e4 LT |
685 | } |
686 | ||
50526df6 | 687 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 688 | { |
1da177e4 LT |
689 | |
690 | if (acpi_device_dir(device)) { | |
691 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
692 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
693 | acpi_device_dir(device) = NULL; | |
694 | } | |
695 | ||
d550d98d | 696 | return 0; |
1da177e4 LT |
697 | } |
698 | ||
1da177e4 LT |
699 | /* -------------------------------------------------------------------------- |
700 | Driver Interface | |
701 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
702 | static acpi_status |
703 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
704 | ||
c0900c35 AS |
705 | static struct acpi_ec *make_acpi_ec(void) |
706 | { | |
707 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
708 | if (!ec) | |
709 | return NULL; | |
080e412c | 710 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
711 | mutex_init(&ec->lock); |
712 | init_waitqueue_head(&ec->wait); | |
837012ed | 713 | INIT_LIST_HEAD(&ec->list); |
c0900c35 AS |
714 | return ec; |
715 | } | |
837012ed | 716 | |
c019b193 AS |
717 | static acpi_status |
718 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
719 | void *context, void **return_value) | |
720 | { | |
721 | struct acpi_namespace_node *node = handle; | |
722 | struct acpi_ec *ec = context; | |
723 | int value = 0; | |
724 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
725 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
726 | } | |
727 | return AE_OK; | |
728 | } | |
729 | ||
cd8c93a4 AS |
730 | static acpi_status |
731 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 732 | { |
cd8c93a4 AS |
733 | acpi_status status; |
734 | ||
735 | struct acpi_ec *ec = context; | |
736 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
737 | ec_parse_io_ports, ec); | |
738 | if (ACPI_FAILURE(status)) | |
739 | return status; | |
837012ed AS |
740 | |
741 | /* Get GPE bit assignment (EC events). */ | |
742 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
743 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
744 | if (ACPI_FAILURE(status)) | |
745 | return status; | |
c019b193 AS |
746 | /* Find and register all query methods */ |
747 | acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, | |
748 | acpi_ec_register_query_methods, ec, NULL); | |
837012ed AS |
749 | /* Use the global lock for all EC transactions? */ |
750 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 751 | ec->handle = handle; |
cd8c93a4 | 752 | return AE_CTRL_TERMINATE; |
837012ed AS |
753 | } |
754 | ||
4c611060 AS |
755 | static void ec_remove_handlers(struct acpi_ec *ec) |
756 | { | |
757 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
758 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 759 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
760 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
761 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 762 | pr_err(PREFIX "failed to remove gpe handler\n"); |
4c611060 AS |
763 | ec->handlers_installed = 0; |
764 | } | |
765 | ||
703959d4 | 766 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 767 | { |
703959d4 | 768 | struct acpi_ec *ec = NULL; |
45bea155 | 769 | |
45bea155 | 770 | if (!device) |
d550d98d | 771 | return -EINVAL; |
c0900c35 AS |
772 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
773 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
774 | ||
4c611060 AS |
775 | /* Check for boot EC */ |
776 | if (boot_ec) { | |
777 | if (boot_ec->handle == device->handle) { | |
778 | /* Pre-loaded EC from DSDT, just move pointer */ | |
779 | ec = boot_ec; | |
780 | boot_ec = NULL; | |
781 | goto end; | |
782 | } else if (boot_ec->handle == ACPI_ROOT_OBJECT) { | |
783 | /* ECDT-based EC, time to shut it down */ | |
784 | ec_remove_handlers(boot_ec); | |
785 | kfree(boot_ec); | |
786 | first_ec = boot_ec = NULL; | |
787 | } | |
788 | } | |
789 | ||
c0900c35 | 790 | ec = make_acpi_ec(); |
45bea155 | 791 | if (!ec) |
d550d98d | 792 | return -ENOMEM; |
703959d4 | 793 | |
cd8c93a4 AS |
794 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
795 | AE_CTRL_TERMINATE) { | |
c0900c35 AS |
796 | kfree(ec); |
797 | return -EINVAL; | |
45bea155 | 798 | } |
c0900c35 | 799 | ec->handle = device->handle; |
4c611060 AS |
800 | end: |
801 | if (!first_ec) | |
802 | first_ec = ec; | |
c0900c35 | 803 | acpi_driver_data(device) = ec; |
c0900c35 | 804 | acpi_ec_add_fs(device); |
3ebe08a7 | 805 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 806 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 807 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 808 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 809 | return 0; |
1da177e4 LT |
810 | } |
811 | ||
50526df6 | 812 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 813 | { |
01f22462 | 814 | struct acpi_ec *ec; |
07ddf768 | 815 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 816 | |
1da177e4 | 817 | if (!device) |
d550d98d | 818 | return -EINVAL; |
1da177e4 LT |
819 | |
820 | ec = acpi_driver_data(device); | |
837012ed | 821 | mutex_lock(&ec->lock); |
07ddf768 | 822 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
823 | list_del(&handler->node); |
824 | kfree(handler); | |
825 | } | |
826 | mutex_unlock(&ec->lock); | |
1da177e4 | 827 | acpi_ec_remove_fs(device); |
c0900c35 | 828 | acpi_driver_data(device) = NULL; |
d033879c | 829 | if (ec == first_ec) |
c0900c35 | 830 | first_ec = NULL; |
4c611060 | 831 | kfree(ec); |
d550d98d | 832 | return 0; |
1da177e4 LT |
833 | } |
834 | ||
1da177e4 | 835 | static acpi_status |
c0900c35 | 836 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 837 | { |
3d02b90b | 838 | struct acpi_ec *ec = context; |
1da177e4 | 839 | |
01f22462 | 840 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 841 | return AE_OK; |
1da177e4 LT |
842 | |
843 | /* | |
844 | * The first address region returned is the data port, and | |
845 | * the second address region returned is the status/command | |
846 | * port. | |
847 | */ | |
01f22462 | 848 | if (ec->data_addr == 0) |
6ffb221a | 849 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 850 | else if (ec->command_addr == 0) |
6ffb221a | 851 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 852 | else |
1da177e4 | 853 | return AE_CTRL_TERMINATE; |
1da177e4 | 854 | |
1da177e4 LT |
855 | return AE_OK; |
856 | } | |
857 | ||
e8284321 AS |
858 | static int ec_install_handlers(struct acpi_ec *ec) |
859 | { | |
c0900c35 | 860 | acpi_status status; |
4c611060 AS |
861 | if (ec->handlers_installed) |
862 | return 0; | |
c0900c35 AS |
863 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
864 | ACPI_GPE_EDGE_TRIGGERED, | |
865 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
866 | if (ACPI_FAILURE(status)) |
867 | return -ENODEV; | |
01f22462 | 868 | |
e8284321 AS |
869 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
870 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
871 | ||
872 | status = acpi_install_address_space_handler(ec->handle, | |
873 | ACPI_ADR_SPACE_EC, | |
874 | &acpi_ec_space_handler, | |
875 | &acpi_ec_space_setup, ec); | |
876 | if (ACPI_FAILURE(status)) { | |
877 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
878 | return -ENODEV; | |
879 | } | |
880 | ||
4c611060 | 881 | ec->handlers_installed = 1; |
e8284321 AS |
882 | return 0; |
883 | } | |
884 | ||
50526df6 | 885 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 886 | { |
c0900c35 | 887 | struct acpi_ec *ec; |
837012ed | 888 | int ret = 0; |
1da177e4 | 889 | |
1da177e4 | 890 | if (!device) |
d550d98d | 891 | return -EINVAL; |
1da177e4 LT |
892 | |
893 | ec = acpi_driver_data(device); | |
894 | ||
895 | if (!ec) | |
d550d98d | 896 | return -EINVAL; |
1da177e4 | 897 | |
4c611060 | 898 | ret = ec_install_handlers(ec); |
837012ed AS |
899 | |
900 | /* EC is fully operational, allow queries */ | |
080e412c | 901 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 902 | return ret; |
1da177e4 LT |
903 | } |
904 | ||
50526df6 | 905 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 906 | { |
c0900c35 | 907 | struct acpi_ec *ec; |
1da177e4 | 908 | if (!device) |
d550d98d | 909 | return -EINVAL; |
1da177e4 | 910 | ec = acpi_driver_data(device); |
c0900c35 AS |
911 | if (!ec) |
912 | return -EINVAL; | |
4c611060 | 913 | ec_remove_handlers(ec); |
f9319f90 | 914 | |
d550d98d | 915 | return 0; |
1da177e4 LT |
916 | } |
917 | ||
c04209a7 AS |
918 | int __init acpi_boot_ec_enable(void) |
919 | { | |
920 | if (!boot_ec || boot_ec->handlers_installed) | |
921 | return 0; | |
922 | if (!ec_install_handlers(boot_ec)) { | |
923 | first_ec = boot_ec; | |
924 | return 0; | |
925 | } | |
926 | return -EFAULT; | |
927 | } | |
928 | ||
c0900c35 AS |
929 | int __init acpi_ec_ecdt_probe(void) |
930 | { | |
931 | int ret; | |
932 | acpi_status status; | |
50526df6 | 933 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 934 | |
d66d969d AS |
935 | boot_ec = make_acpi_ec(); |
936 | if (!boot_ec) | |
c0900c35 AS |
937 | return -ENOMEM; |
938 | /* | |
939 | * Generate a boot ec context | |
940 | */ | |
15a58ed1 AS |
941 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
942 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 943 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 944 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
945 | boot_ec->command_addr = ecdt_ptr->control.address; |
946 | boot_ec->data_addr = ecdt_ptr->data.address; | |
947 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 948 | boot_ec->handle = ACPI_ROOT_OBJECT; |
cd8c93a4 | 949 | } else { |
5870a8cd AS |
950 | /* This workaround is needed only on some broken machines, |
951 | * which require early EC, but fail to provide ECDT */ | |
952 | acpi_handle x; | |
cd8c93a4 AS |
953 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
954 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
955 | boot_ec, NULL); | |
2d8348b4 AS |
956 | /* Check that acpi_get_devices actually find something */ |
957 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 958 | goto error; |
5870a8cd AS |
959 | /* We really need to limit this workaround, the only ASUS, |
960 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 961 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
962 | */ |
963 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 964 | return -ENODEV; |
cd8c93a4 | 965 | } |
1da177e4 | 966 | |
d66d969d | 967 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
968 | if (!ret) { |
969 | first_ec = boot_ec; | |
e8284321 | 970 | return 0; |
d033879c | 971 | } |
c0900c35 | 972 | error: |
d66d969d AS |
973 | kfree(boot_ec); |
974 | boot_ec = NULL; | |
1da177e4 LT |
975 | return -ENODEV; |
976 | } | |
977 | ||
50526df6 | 978 | static int __init acpi_ec_init(void) |
1da177e4 | 979 | { |
50526df6 | 980 | int result = 0; |
1da177e4 | 981 | |
1da177e4 | 982 | if (acpi_disabled) |
d550d98d | 983 | return 0; |
1da177e4 LT |
984 | |
985 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
986 | if (!acpi_ec_dir) | |
d550d98d | 987 | return -ENODEV; |
1da177e4 LT |
988 | |
989 | /* Now register the driver for the EC */ | |
990 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
991 | if (result < 0) { | |
992 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 993 | return -ENODEV; |
1da177e4 LT |
994 | } |
995 | ||
d550d98d | 996 | return result; |
1da177e4 LT |
997 | } |
998 | ||
999 | subsys_initcall(acpi_ec_init); | |
1000 | ||
1001 | /* EC driver currently not unloadable */ | |
1002 | #if 0 | |
50526df6 | 1003 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1004 | { |
1da177e4 LT |
1005 | |
1006 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1007 | ||
1008 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1009 | ||
d550d98d | 1010 | return; |
1da177e4 | 1011 | } |
7843932a | 1012 | #endif /* 0 */ |