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1da177e4 LT |
1 | /* |
2 | * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $) | |
3 | * | |
4 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or (at | |
13 | * your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
23 | * | |
24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
25 | */ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <linux/seq_file.h> | |
451566f4 | 34 | #include <linux/interrupt.h> |
1da177e4 LT |
35 | #include <asm/io.h> |
36 | #include <acpi/acpi_bus.h> | |
37 | #include <acpi/acpi_drivers.h> | |
38 | #include <acpi/actypes.h> | |
39 | ||
40 | #define _COMPONENT ACPI_EC_COMPONENT | |
f52fd66d | 41 | ACPI_MODULE_NAME("ec"); |
1da177e4 LT |
42 | #define ACPI_EC_COMPONENT 0x00100000 |
43 | #define ACPI_EC_CLASS "embedded_controller" | |
44 | #define ACPI_EC_HID "PNP0C09" | |
1da177e4 LT |
45 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
46 | #define ACPI_EC_FILE_INFO "info" | |
af3fd140 AS |
47 | #undef PREFIX |
48 | #define PREFIX "ACPI: EC: " | |
703959d4 | 49 | /* EC status register */ |
1da177e4 LT |
50 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
51 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 52 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 53 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
703959d4 | 54 | /* EC commands */ |
3261ff4d | 55 | enum ec_command { |
6ccedb10 AS |
56 | ACPI_EC_COMMAND_READ = 0x80, |
57 | ACPI_EC_COMMAND_WRITE = 0x81, | |
58 | ACPI_EC_BURST_ENABLE = 0x82, | |
59 | ACPI_EC_BURST_DISABLE = 0x83, | |
60 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 61 | }; |
703959d4 | 62 | /* EC events */ |
3261ff4d | 63 | enum ec_event { |
703959d4 | 64 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
6ccedb10 | 65 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
66 | }; |
67 | ||
5c406412 | 68 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 70 | |
3261ff4d | 71 | static enum ec_mode { |
6ccedb10 AS |
72 | EC_INTR = 1, /* Output buffer full */ |
73 | EC_POLL, /* Input buffer empty */ | |
3261ff4d | 74 | } acpi_ec_mode = EC_INTR; |
703959d4 | 75 | |
50526df6 LB |
76 | static int acpi_ec_remove(struct acpi_device *device, int type); |
77 | static int acpi_ec_start(struct acpi_device *device); | |
78 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 79 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
80 | |
81 | static struct acpi_driver acpi_ec_driver = { | |
c2b6705b | 82 | .name = "ec", |
50526df6 LB |
83 | .class = ACPI_EC_CLASS, |
84 | .ids = ACPI_EC_HID, | |
85 | .ops = { | |
703959d4 | 86 | .add = acpi_ec_add, |
50526df6 LB |
87 | .remove = acpi_ec_remove, |
88 | .start = acpi_ec_start, | |
89 | .stop = acpi_ec_stop, | |
90 | }, | |
1da177e4 | 91 | }; |
6ffb221a DS |
92 | |
93 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
a854e08a | 94 | static struct acpi_ec { |
703959d4 DS |
95 | acpi_handle handle; |
96 | unsigned long uid; | |
a86e2772 | 97 | unsigned long gpe; |
6ffb221a DS |
98 | unsigned long command_addr; |
99 | unsigned long data_addr; | |
703959d4 | 100 | unsigned long global_lock; |
c787a855 | 101 | struct mutex lock; |
5d0c288b | 102 | atomic_t query_pending; |
703959d4 DS |
103 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ |
104 | wait_queue_head_t wait; | |
6ffb221a | 105 | } *ec_ecdt; |
703959d4 DS |
106 | |
107 | /* External interfaces use first EC only, so remember */ | |
108 | static struct acpi_device *first_ec; | |
703959d4 | 109 | |
1da177e4 LT |
110 | /* -------------------------------------------------------------------------- |
111 | Transaction Management | |
112 | -------------------------------------------------------------------------- */ | |
113 | ||
6ffb221a | 114 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 115 | { |
6ffb221a | 116 | return inb(ec->command_addr); |
451566f4 DT |
117 | } |
118 | ||
6ffb221a | 119 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 120 | { |
6ffb221a | 121 | return inb(ec->data_addr); |
7c6db5e5 DS |
122 | } |
123 | ||
6ffb221a | 124 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 125 | { |
6ffb221a | 126 | outb(command, ec->command_addr); |
45bea155 LY |
127 | } |
128 | ||
6ffb221a | 129 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 130 | { |
6ffb221a | 131 | outb(data, ec->data_addr); |
703959d4 | 132 | } |
45bea155 | 133 | |
3261ff4d | 134 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 135 | { |
bec5a1e0 | 136 | u8 status = acpi_ec_read_status(ec); |
78d0af33 AS |
137 | |
138 | if (event == ACPI_EC_EVENT_OBF_1) { | |
703959d4 DS |
139 | if (status & ACPI_EC_FLAG_OBF) |
140 | return 1; | |
78d0af33 | 141 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
703959d4 DS |
142 | if (!(status & ACPI_EC_FLAG_IBF)) |
143 | return 1; | |
45bea155 LY |
144 | } |
145 | ||
703959d4 | 146 | return 0; |
45bea155 | 147 | } |
451566f4 | 148 | |
3261ff4d | 149 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event) |
7c6db5e5 | 150 | { |
af3fd140 | 151 | if (acpi_ec_mode == EC_POLL) { |
50c1e113 AS |
152 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
153 | while (time_before(jiffies, delay)) { | |
af3fd140 | 154 | if (acpi_ec_check_status(ec, event)) |
7c6db5e5 DS |
155 | return 0; |
156 | } | |
af3fd140 AS |
157 | } else { |
158 | if (wait_event_timeout(ec->wait, | |
159 | acpi_ec_check_status(ec, event), | |
160 | msecs_to_jiffies(ACPI_EC_DELAY)) || | |
161 | acpi_ec_check_status(ec, event)) { | |
703959d4 | 162 | return 0; |
af3fd140 AS |
163 | } else { |
164 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
165 | " status = %d, expect_event = %d\n", | |
6ccedb10 | 166 | acpi_ec_read_status(ec), event); |
703959d4 | 167 | } |
af3fd140 | 168 | } |
1da177e4 | 169 | |
d550d98d | 170 | return -ETIME; |
1da177e4 LT |
171 | } |
172 | ||
02b28a33 | 173 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
174 | /* |
175 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
176 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
177 | */ | |
703959d4 | 178 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 179 | { |
6ffb221a DS |
180 | u8 tmp = 0; |
181 | u8 status = 0; | |
451566f4 | 182 | |
451566f4 | 183 | status = acpi_ec_read_status(ec); |
50526df6 | 184 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 185 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 186 | if (status) |
716e084e | 187 | goto end; |
703959d4 DS |
188 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
189 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
190 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 191 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 192 | return -EINVAL; |
451566f4 | 193 | } |
668d74c0 LY |
194 | } |
195 | ||
703959d4 | 196 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 197 | return 0; |
6ccedb10 | 198 | end: |
703959d4 | 199 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); |
d550d98d | 200 | return -1; |
451566f4 DT |
201 | } |
202 | ||
703959d4 | 203 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 204 | { |
6ffb221a | 205 | u8 status = 0; |
451566f4 | 206 | |
06a2a385 | 207 | status = acpi_ec_read_status(ec); |
6ccedb10 | 208 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 209 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
6ccedb10 | 210 | if (status) |
06a2a385 | 211 | goto end; |
703959d4 DS |
212 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
213 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 214 | } |
703959d4 | 215 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 216 | return 0; |
6ccedb10 | 217 | end: |
703959d4 | 218 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); |
d550d98d | 219 | return -1; |
451566f4 | 220 | } |
6ccedb10 | 221 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 222 | |
703959d4 | 223 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
224 | const u8 * wdata, unsigned wdata_len, |
225 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 226 | { |
af3fd140 | 227 | int result = 0; |
45bea155 | 228 | |
703959d4 | 229 | acpi_ec_write_cmd(ec, command); |
45bea155 | 230 | |
78d0af33 | 231 | for (; wdata_len > 0; --wdata_len) { |
703959d4 | 232 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 | 233 | if (result) { |
6ccedb10 AS |
234 | printk(KERN_ERR PREFIX |
235 | "write_cmd timeout, command = %d\n", command); | |
af3fd140 AS |
236 | goto end; |
237 | } | |
703959d4 | 238 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 239 | } |
45bea155 | 240 | |
d91df1aa | 241 | if (!rdata_len) { |
703959d4 | 242 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 | 243 | if (result) { |
6ccedb10 AS |
244 | printk(KERN_ERR PREFIX |
245 | "finish-write timeout, command = %d\n", command); | |
af3fd140 AS |
246 | goto end; |
247 | } | |
5d0c288b AS |
248 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
249 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 250 | } |
45bea155 | 251 | |
78d0af33 | 252 | for (; rdata_len > 0; --rdata_len) { |
703959d4 | 253 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
af3fd140 AS |
254 | if (result) { |
255 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
6ccedb10 | 256 | command); |
af3fd140 AS |
257 | goto end; |
258 | } | |
50526df6 | 259 | |
6ffb221a | 260 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 261 | } |
af3fd140 AS |
262 | end: |
263 | return result; | |
45bea155 LY |
264 | } |
265 | ||
3576cf61 | 266 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
267 | const u8 * wdata, unsigned wdata_len, |
268 | u8 * rdata, unsigned rdata_len) | |
1da177e4 | 269 | { |
d7a76e4c | 270 | int status; |
50526df6 | 271 | u32 glk; |
1da177e4 | 272 | |
d7a76e4c | 273 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 274 | return -EINVAL; |
1da177e4 | 275 | |
6ccedb10 AS |
276 | if (rdata) |
277 | memset(rdata, 0, rdata_len); | |
1da177e4 | 278 | |
523953b4 | 279 | mutex_lock(&ec->lock); |
703959d4 | 280 | if (ec->global_lock) { |
1da177e4 | 281 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
282 | if (ACPI_FAILURE(status)) { |
283 | mutex_unlock(&ec->lock); | |
d550d98d | 284 | return -ENODEV; |
c24e912b | 285 | } |
1da177e4 | 286 | } |
451566f4 | 287 | |
5d57a6a5 | 288 | /* Make sure GPE is enabled before doing transaction */ |
a86e2772 | 289 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
5d57a6a5 | 290 | |
703959d4 | 291 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 292 | if (status) { |
6ccedb10 AS |
293 | printk(KERN_DEBUG PREFIX |
294 | "input buffer is not empty, aborting transaction\n"); | |
451566f4 | 295 | goto end; |
716e084e | 296 | } |
1da177e4 | 297 | |
6ccedb10 AS |
298 | status = acpi_ec_transaction_unlocked(ec, command, |
299 | wdata, wdata_len, | |
300 | rdata, rdata_len); | |
1da177e4 | 301 | |
6ccedb10 | 302 | end: |
1da177e4 | 303 | |
703959d4 | 304 | if (ec->global_lock) |
1da177e4 | 305 | acpi_release_global_lock(glk); |
523953b4 | 306 | mutex_unlock(&ec->lock); |
1da177e4 | 307 | |
d550d98d | 308 | return status; |
1da177e4 LT |
309 | } |
310 | ||
6ccedb10 | 311 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
312 | { |
313 | int result; | |
314 | u8 d; | |
315 | ||
316 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
317 | &address, 1, &d, 1); | |
318 | *data = d; | |
319 | return result; | |
320 | } | |
6ffb221a | 321 | |
3576cf61 DS |
322 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
323 | { | |
6ccedb10 AS |
324 | u8 wdata[2] = { address, data }; |
325 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
3576cf61 DS |
326 | wdata, 2, NULL, 0); |
327 | } | |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Externally callable EC access functions. For now, assume 1 EC only | |
331 | */ | |
6ccedb10 | 332 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 333 | { |
703959d4 | 334 | struct acpi_ec *ec; |
1da177e4 | 335 | int err; |
6ffb221a | 336 | u8 temp_data; |
1da177e4 LT |
337 | |
338 | if (!first_ec) | |
339 | return -ENODEV; | |
340 | ||
341 | ec = acpi_driver_data(first_ec); | |
342 | ||
343 | err = acpi_ec_read(ec, addr, &temp_data); | |
344 | ||
345 | if (!err) { | |
346 | *val = temp_data; | |
347 | return 0; | |
50526df6 | 348 | } else |
1da177e4 LT |
349 | return err; |
350 | } | |
50526df6 | 351 | |
1da177e4 LT |
352 | EXPORT_SYMBOL(ec_read); |
353 | ||
50526df6 | 354 | int ec_write(u8 addr, u8 val) |
1da177e4 | 355 | { |
703959d4 | 356 | struct acpi_ec *ec; |
1da177e4 LT |
357 | int err; |
358 | ||
359 | if (!first_ec) | |
360 | return -ENODEV; | |
361 | ||
362 | ec = acpi_driver_data(first_ec); | |
363 | ||
364 | err = acpi_ec_write(ec, addr, val); | |
365 | ||
366 | return err; | |
367 | } | |
50526df6 | 368 | |
1da177e4 LT |
369 | EXPORT_SYMBOL(ec_write); |
370 | ||
616362de | 371 | int ec_transaction(u8 command, |
6ccedb10 AS |
372 | const u8 * wdata, unsigned wdata_len, |
373 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 374 | { |
703959d4 | 375 | struct acpi_ec *ec; |
45bea155 | 376 | |
d7a76e4c LP |
377 | if (!first_ec) |
378 | return -ENODEV; | |
45bea155 | 379 | |
d7a76e4c | 380 | ec = acpi_driver_data(first_ec); |
45bea155 | 381 | |
3576cf61 DS |
382 | return acpi_ec_transaction(ec, command, wdata, |
383 | wdata_len, rdata, rdata_len); | |
45bea155 | 384 | } |
1da177e4 | 385 | |
ab9e43c6 LP |
386 | EXPORT_SYMBOL(ec_transaction); |
387 | ||
6ccedb10 | 388 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
389 | { |
390 | int result; | |
6ccedb10 | 391 | u8 d; |
1da177e4 | 392 | |
6ccedb10 AS |
393 | if (!ec || !data) |
394 | return -EINVAL; | |
1da177e4 | 395 | |
6ccedb10 AS |
396 | /* |
397 | * Query the EC to find out which _Qxx method we need to evaluate. | |
398 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
399 | * bit to be cleared (and thus clearing the interrupt source). | |
400 | */ | |
716e084e | 401 | |
6ccedb10 AS |
402 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
403 | if (result) | |
404 | return result; | |
1da177e4 | 405 | |
6ccedb10 AS |
406 | if (!d) |
407 | return -ENODATA; | |
1da177e4 | 408 | |
6ccedb10 AS |
409 | *data = d; |
410 | return 0; | |
1da177e4 LT |
411 | } |
412 | ||
1da177e4 LT |
413 | /* -------------------------------------------------------------------------- |
414 | Event Management | |
415 | -------------------------------------------------------------------------- */ | |
416 | ||
50526df6 | 417 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 418 | { |
703959d4 | 419 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
6ffb221a | 420 | u8 value = 0; |
5d0c288b | 421 | char object_name[8]; |
45bea155 | 422 | |
5d0c288b | 423 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 424 | return; |
45bea155 | 425 | |
6ffb221a | 426 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 427 | |
c6e19194 | 428 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 429 | |
703959d4 | 430 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 431 | } |
1da177e4 | 432 | |
50526df6 | 433 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 434 | { |
50526df6 | 435 | acpi_status status = AE_OK; |
6ffb221a | 436 | u8 value; |
703959d4 | 437 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 438 | |
8e0341ba | 439 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 440 | wake_up(&ec->wait); |
451566f4 DT |
441 | } |
442 | ||
bec5a1e0 | 443 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
444 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
445 | atomic_set(&ec->query_pending, 1); | |
6ccedb10 AS |
446 | status = |
447 | acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, | |
448 | ec); | |
50526df6 | 449 | } |
e41334c0 | 450 | |
451566f4 | 451 | return status == AE_OK ? |
50526df6 | 452 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
453 | } |
454 | ||
455 | /* -------------------------------------------------------------------------- | |
456 | Address Space Management | |
457 | -------------------------------------------------------------------------- */ | |
458 | ||
459 | static acpi_status | |
50526df6 LB |
460 | acpi_ec_space_setup(acpi_handle region_handle, |
461 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
462 | { |
463 | /* | |
464 | * The EC object is in the handler context and is needed | |
465 | * when calling the acpi_ec_space_handler. | |
466 | */ | |
50526df6 LB |
467 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
468 | handler_context : NULL; | |
1da177e4 LT |
469 | |
470 | return AE_OK; | |
471 | } | |
472 | ||
1da177e4 | 473 | static acpi_status |
50526df6 LB |
474 | acpi_ec_space_handler(u32 function, |
475 | acpi_physical_address address, | |
476 | u32 bit_width, | |
477 | acpi_integer * value, | |
478 | void *handler_context, void *region_context) | |
1da177e4 | 479 | { |
50526df6 | 480 | int result = 0; |
703959d4 | 481 | struct acpi_ec *ec = NULL; |
50526df6 LB |
482 | u64 temp = *value; |
483 | acpi_integer f_v = 0; | |
484 | int i = 0; | |
1da177e4 | 485 | |
1da177e4 | 486 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 487 | return AE_BAD_PARAMETER; |
1da177e4 | 488 | |
fa9cd547 | 489 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 490 | return AE_BAD_PARAMETER; |
1da177e4 LT |
491 | } |
492 | ||
703959d4 | 493 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 494 | |
50526df6 | 495 | next_byte: |
1da177e4 LT |
496 | switch (function) { |
497 | case ACPI_READ: | |
fa9cd547 | 498 | temp = 0; |
6ccedb10 | 499 | result = acpi_ec_read(ec, (u8) address, (u8 *) & temp); |
1da177e4 LT |
500 | break; |
501 | case ACPI_WRITE: | |
fa9cd547 | 502 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
503 | break; |
504 | default: | |
505 | result = -EINVAL; | |
506 | goto out; | |
507 | break; | |
508 | } | |
509 | ||
510 | bit_width -= 8; | |
fa9cd547 LY |
511 | if (bit_width) { |
512 | if (function == ACPI_READ) | |
513 | f_v |= temp << 8 * i; | |
514 | if (function == ACPI_WRITE) | |
515 | temp >>= 8; | |
1da177e4 | 516 | i++; |
83ea7445 | 517 | address++; |
1da177e4 LT |
518 | goto next_byte; |
519 | } | |
520 | ||
fa9cd547 LY |
521 | if (function == ACPI_READ) { |
522 | f_v |= temp << 8 * i; | |
1da177e4 LT |
523 | *value = f_v; |
524 | } | |
525 | ||
50526df6 | 526 | out: |
1da177e4 LT |
527 | switch (result) { |
528 | case -EINVAL: | |
d550d98d | 529 | return AE_BAD_PARAMETER; |
1da177e4 LT |
530 | break; |
531 | case -ENODEV: | |
d550d98d | 532 | return AE_NOT_FOUND; |
1da177e4 LT |
533 | break; |
534 | case -ETIME: | |
d550d98d | 535 | return AE_TIME; |
1da177e4 LT |
536 | break; |
537 | default: | |
d550d98d | 538 | return AE_OK; |
1da177e4 | 539 | } |
1da177e4 LT |
540 | } |
541 | ||
1da177e4 LT |
542 | /* -------------------------------------------------------------------------- |
543 | FS Interface (/proc) | |
544 | -------------------------------------------------------------------------- */ | |
545 | ||
50526df6 | 546 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 547 | |
50526df6 | 548 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 549 | { |
703959d4 | 550 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 551 | |
1da177e4 LT |
552 | if (!ec) |
553 | goto end; | |
554 | ||
6ccedb10 | 555 | seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe); |
1da177e4 | 556 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ccedb10 | 557 | (u32) ec->command_addr, (u32) ec->data_addr); |
1da177e4 | 558 | seq_printf(seq, "use global lock: %s\n", |
703959d4 | 559 | ec->global_lock ? "yes" : "no"); |
a86e2772 | 560 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
1da177e4 | 561 | |
50526df6 | 562 | end: |
d550d98d | 563 | return 0; |
1da177e4 LT |
564 | } |
565 | ||
566 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
567 | { | |
568 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
569 | } | |
570 | ||
703959d4 | 571 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
572 | .open = acpi_ec_info_open_fs, |
573 | .read = seq_read, | |
574 | .llseek = seq_lseek, | |
575 | .release = single_release, | |
1da177e4 LT |
576 | .owner = THIS_MODULE, |
577 | }; | |
578 | ||
50526df6 | 579 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 580 | { |
50526df6 | 581 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 582 | |
1da177e4 LT |
583 | if (!acpi_device_dir(device)) { |
584 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 585 | acpi_ec_dir); |
1da177e4 | 586 | if (!acpi_device_dir(device)) |
d550d98d | 587 | return -ENODEV; |
1da177e4 LT |
588 | } |
589 | ||
590 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 591 | acpi_device_dir(device)); |
1da177e4 | 592 | if (!entry) |
d550d98d | 593 | return -ENODEV; |
1da177e4 LT |
594 | else { |
595 | entry->proc_fops = &acpi_ec_info_ops; | |
596 | entry->data = acpi_driver_data(device); | |
597 | entry->owner = THIS_MODULE; | |
598 | } | |
599 | ||
d550d98d | 600 | return 0; |
1da177e4 LT |
601 | } |
602 | ||
50526df6 | 603 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 604 | { |
1da177e4 LT |
605 | |
606 | if (acpi_device_dir(device)) { | |
607 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
608 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
609 | acpi_device_dir(device) = NULL; | |
610 | } | |
611 | ||
d550d98d | 612 | return 0; |
1da177e4 LT |
613 | } |
614 | ||
1da177e4 LT |
615 | /* -------------------------------------------------------------------------- |
616 | Driver Interface | |
617 | -------------------------------------------------------------------------- */ | |
618 | ||
703959d4 | 619 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 620 | { |
50526df6 LB |
621 | int result = 0; |
622 | acpi_status status = AE_OK; | |
703959d4 | 623 | struct acpi_ec *ec = NULL; |
45bea155 | 624 | |
45bea155 | 625 | if (!device) |
d550d98d | 626 | return -EINVAL; |
45bea155 | 627 | |
36bcbec7 | 628 | ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 629 | if (!ec) |
d550d98d | 630 | return -ENOMEM; |
703959d4 DS |
631 | |
632 | ec->handle = device->handle; | |
633 | ec->uid = -1; | |
c787a855 | 634 | mutex_init(&ec->lock); |
5d0c288b | 635 | atomic_set(&ec->query_pending, 0); |
703959d4 DS |
636 | if (acpi_ec_mode == EC_INTR) { |
637 | atomic_set(&ec->leaving_burst, 1); | |
638 | init_waitqueue_head(&ec->wait); | |
45bea155 | 639 | } |
1da177e4 LT |
640 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
641 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
642 | acpi_driver_data(device) = ec; | |
643 | ||
644 | /* Use the global lock for all EC transactions? */ | |
6ccedb10 | 645 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); |
1da177e4 | 646 | |
ff2fc3e9 JS |
647 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
648 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
649 | if (ec_ecdt) { | |
1da177e4 | 650 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
651 | ACPI_ADR_SPACE_EC, |
652 | &acpi_ec_space_handler); | |
451566f4 | 653 | |
a86e2772 | 654 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 655 | &acpi_ec_gpe_handler); |
1da177e4 LT |
656 | |
657 | kfree(ec_ecdt); | |
658 | } | |
659 | ||
660 | /* Get GPE bit assignment (EC events). */ | |
661 | /* TODO: Add support for _GPE returning a package */ | |
6ccedb10 | 662 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe); |
1da177e4 | 663 | if (ACPI_FAILURE(status)) { |
6ccedb10 AS |
664 | ACPI_EXCEPTION((AE_INFO, status, |
665 | "Obtaining GPE bit assignment")); | |
1da177e4 LT |
666 | result = -ENODEV; |
667 | goto end; | |
668 | } | |
669 | ||
670 | result = acpi_ec_add_fs(device); | |
671 | if (result) | |
672 | goto end; | |
673 | ||
703959d4 | 674 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
6ccedb10 AS |
675 | acpi_device_name(device), acpi_device_bid(device), |
676 | (u32) ec->gpe)); | |
1da177e4 LT |
677 | |
678 | if (!first_ec) | |
679 | first_ec = device; | |
680 | ||
6ccedb10 | 681 | end: |
1da177e4 LT |
682 | if (result) |
683 | kfree(ec); | |
684 | ||
d550d98d | 685 | return result; |
1da177e4 LT |
686 | } |
687 | ||
50526df6 | 688 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 689 | { |
703959d4 | 690 | struct acpi_ec *ec = NULL; |
1da177e4 | 691 | |
1da177e4 | 692 | if (!device) |
d550d98d | 693 | return -EINVAL; |
1da177e4 LT |
694 | |
695 | ec = acpi_driver_data(device); | |
696 | ||
697 | acpi_ec_remove_fs(device); | |
698 | ||
699 | kfree(ec); | |
700 | ||
d550d98d | 701 | return 0; |
1da177e4 LT |
702 | } |
703 | ||
1da177e4 | 704 | static acpi_status |
50526df6 | 705 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 706 | { |
703959d4 | 707 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 708 | |
50eca3eb | 709 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
710 | return AE_OK; |
711 | } | |
712 | ||
713 | /* | |
714 | * The first address region returned is the data port, and | |
715 | * the second address region returned is the status/command | |
716 | * port. | |
717 | */ | |
6ffb221a DS |
718 | if (ec->data_addr == 0) { |
719 | ec->data_addr = resource->data.io.minimum; | |
720 | } else if (ec->command_addr == 0) { | |
721 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
722 | } else { |
723 | return AE_CTRL_TERMINATE; | |
724 | } | |
725 | ||
1da177e4 LT |
726 | return AE_OK; |
727 | } | |
728 | ||
50526df6 | 729 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 730 | { |
50526df6 | 731 | acpi_status status = AE_OK; |
703959d4 | 732 | struct acpi_ec *ec = NULL; |
1da177e4 | 733 | |
1da177e4 | 734 | if (!device) |
d550d98d | 735 | return -EINVAL; |
1da177e4 LT |
736 | |
737 | ec = acpi_driver_data(device); | |
738 | ||
739 | if (!ec) | |
d550d98d | 740 | return -EINVAL; |
1da177e4 LT |
741 | |
742 | /* | |
743 | * Get I/O port addresses. Convert to GAS format. | |
744 | */ | |
703959d4 | 745 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 746 | acpi_ec_io_ports, ec); |
6ffb221a | 747 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
748 | ACPI_EXCEPTION((AE_INFO, status, |
749 | "Error getting I/O port addresses")); | |
d550d98d | 750 | return -ENODEV; |
1da177e4 LT |
751 | } |
752 | ||
6ffb221a | 753 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
a86e2772 | 754 | ec->gpe, ec->command_addr, ec->data_addr)); |
1da177e4 LT |
755 | |
756 | /* | |
757 | * Install GPE handler | |
758 | */ | |
a86e2772 | 759 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
50526df6 LB |
760 | ACPI_GPE_EDGE_TRIGGERED, |
761 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 762 | if (ACPI_FAILURE(status)) { |
d550d98d | 763 | return -ENODEV; |
1da177e4 | 764 | } |
a86e2772 AS |
765 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
766 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1da177e4 | 767 | |
703959d4 | 768 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
769 | ACPI_ADR_SPACE_EC, |
770 | &acpi_ec_space_handler, | |
771 | &acpi_ec_space_setup, ec); | |
1da177e4 | 772 | if (ACPI_FAILURE(status)) { |
6ccedb10 | 773 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); |
d550d98d | 774 | return -ENODEV; |
1da177e4 LT |
775 | } |
776 | ||
d550d98d | 777 | return AE_OK; |
1da177e4 LT |
778 | } |
779 | ||
50526df6 | 780 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 781 | { |
50526df6 | 782 | acpi_status status = AE_OK; |
703959d4 | 783 | struct acpi_ec *ec = NULL; |
1da177e4 | 784 | |
1da177e4 | 785 | if (!device) |
d550d98d | 786 | return -EINVAL; |
1da177e4 LT |
787 | |
788 | ec = acpi_driver_data(device); | |
789 | ||
703959d4 | 790 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
791 | ACPI_ADR_SPACE_EC, |
792 | &acpi_ec_space_handler); | |
1da177e4 | 793 | if (ACPI_FAILURE(status)) |
d550d98d | 794 | return -ENODEV; |
1da177e4 | 795 | |
6ccedb10 | 796 | status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); |
1da177e4 | 797 | if (ACPI_FAILURE(status)) |
d550d98d | 798 | return -ENODEV; |
1da177e4 | 799 | |
d550d98d | 800 | return 0; |
1da177e4 LT |
801 | } |
802 | ||
803 | static acpi_status __init | |
50526df6 LB |
804 | acpi_fake_ecdt_callback(acpi_handle handle, |
805 | u32 Level, void *context, void **retval) | |
1da177e4 | 806 | { |
50526df6 | 807 | acpi_status status; |
1da177e4 | 808 | |
c787a855 | 809 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
810 | if (acpi_ec_mode == EC_INTR) { |
811 | init_waitqueue_head(&ec_ecdt->wait); | |
812 | } | |
1da177e4 | 813 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 814 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
815 | if (ACPI_FAILURE(status)) |
816 | return status; | |
1da177e4 | 817 | |
703959d4 DS |
818 | ec_ecdt->uid = -1; |
819 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 820 | |
6ccedb10 | 821 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe); |
1da177e4 LT |
822 | if (ACPI_FAILURE(status)) |
823 | return status; | |
703959d4 DS |
824 | ec_ecdt->global_lock = TRUE; |
825 | ec_ecdt->handle = handle; | |
1da177e4 | 826 | |
6ffb221a | 827 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
6ccedb10 AS |
828 | ec_ecdt->gpe, ec_ecdt->command_addr, |
829 | ec_ecdt->data_addr)); | |
1da177e4 LT |
830 | |
831 | return AE_CTRL_TERMINATE; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
836 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
837 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
838 | * required, but if EC regison is accessed early, it is required. | |
839 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
840 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
841 | * op region (since _REG isn't invoked yet). The assumption is true for | |
842 | * all systems found. | |
843 | */ | |
50526df6 | 844 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 845 | { |
50526df6 LB |
846 | acpi_status status; |
847 | int ret = 0; | |
1da177e4 | 848 | |
703959d4 | 849 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 850 | |
36bcbec7 | 851 | ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
852 | if (!ec_ecdt) { |
853 | ret = -ENOMEM; | |
854 | goto error; | |
855 | } | |
1da177e4 | 856 | |
50526df6 LB |
857 | status = acpi_get_devices(ACPI_EC_HID, |
858 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
859 | if (ACPI_FAILURE(status)) { |
860 | kfree(ec_ecdt); | |
861 | ec_ecdt = NULL; | |
862 | ret = -ENODEV; | |
703959d4 | 863 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
864 | goto error; |
865 | } | |
866 | return 0; | |
6ccedb10 | 867 | error: |
1da177e4 LT |
868 | return ret; |
869 | } | |
870 | ||
50526df6 | 871 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 872 | { |
50526df6 LB |
873 | acpi_status status; |
874 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 875 | |
15a58ed1 AS |
876 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
877 | (struct acpi_table_header **)&ecdt_ptr); | |
45bea155 LY |
878 | if (ACPI_FAILURE(status)) |
879 | return -ENODEV; | |
880 | ||
703959d4 | 881 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
882 | |
883 | /* | |
884 | * Generate a temporary ec context to use until the namespace is scanned | |
885 | */ | |
36bcbec7 | 886 | ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
887 | if (!ec_ecdt) |
888 | return -ENOMEM; | |
45bea155 | 889 | |
c787a855 | 890 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
891 | if (acpi_ec_mode == EC_INTR) { |
892 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 893 | } |
ad363f80 AS |
894 | ec_ecdt->command_addr = ecdt_ptr->control.address; |
895 | ec_ecdt->data_addr = ecdt_ptr->data.address; | |
896 | ec_ecdt->gpe = ecdt_ptr->gpe; | |
1da177e4 | 897 | /* use the GL just to be safe */ |
703959d4 DS |
898 | ec_ecdt->global_lock = TRUE; |
899 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 900 | |
ad363f80 | 901 | status = acpi_get_handle(NULL, ecdt_ptr->id, &ec_ecdt->handle); |
1da177e4 LT |
902 | if (ACPI_FAILURE(status)) { |
903 | goto error; | |
904 | } | |
905 | ||
906 | return 0; | |
6ccedb10 | 907 | error: |
703959d4 | 908 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
909 | kfree(ec_ecdt); |
910 | ec_ecdt = NULL; | |
911 | ||
912 | return -ENODEV; | |
913 | } | |
914 | ||
915 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 916 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 917 | { |
50526df6 LB |
918 | acpi_status status; |
919 | int ret; | |
1da177e4 LT |
920 | |
921 | ret = acpi_ec_get_real_ecdt(); | |
922 | /* Try to make a fake ECDT */ | |
923 | if (ret && acpi_fake_ecdt_enabled) { | |
924 | ret = acpi_ec_fake_ecdt(); | |
925 | } | |
926 | ||
927 | if (ret) | |
928 | return 0; | |
929 | ||
930 | /* | |
931 | * Install GPE handler | |
932 | */ | |
a86e2772 | 933 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 LB |
934 | ACPI_GPE_EDGE_TRIGGERED, |
935 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
936 | if (ACPI_FAILURE(status)) { |
937 | goto error; | |
938 | } | |
a86e2772 AS |
939 | acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME); |
940 | acpi_enable_gpe(NULL, ec_ecdt->gpe, ACPI_NOT_ISR); | |
50526df6 LB |
941 | |
942 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
943 | ACPI_ADR_SPACE_EC, | |
944 | &acpi_ec_space_handler, | |
945 | &acpi_ec_space_setup, | |
946 | ec_ecdt); | |
1da177e4 | 947 | if (ACPI_FAILURE(status)) { |
a86e2772 | 948 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 949 | &acpi_ec_gpe_handler); |
1da177e4 LT |
950 | goto error; |
951 | } | |
952 | ||
953 | return 0; | |
954 | ||
50526df6 | 955 | error: |
703959d4 | 956 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
957 | kfree(ec_ecdt); |
958 | ec_ecdt = NULL; | |
959 | ||
960 | return -ENODEV; | |
961 | } | |
962 | ||
50526df6 | 963 | static int __init acpi_ec_init(void) |
1da177e4 | 964 | { |
50526df6 | 965 | int result = 0; |
1da177e4 | 966 | |
1da177e4 | 967 | if (acpi_disabled) |
d550d98d | 968 | return 0; |
1da177e4 LT |
969 | |
970 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
971 | if (!acpi_ec_dir) | |
d550d98d | 972 | return -ENODEV; |
1da177e4 LT |
973 | |
974 | /* Now register the driver for the EC */ | |
975 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
976 | if (result < 0) { | |
977 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 978 | return -ENODEV; |
1da177e4 LT |
979 | } |
980 | ||
d550d98d | 981 | return result; |
1da177e4 LT |
982 | } |
983 | ||
984 | subsys_initcall(acpi_ec_init); | |
985 | ||
986 | /* EC driver currently not unloadable */ | |
987 | #if 0 | |
50526df6 | 988 | static void __exit acpi_ec_exit(void) |
1da177e4 | 989 | { |
1da177e4 LT |
990 | |
991 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
992 | ||
993 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
994 | ||
d550d98d | 995 | return; |
1da177e4 | 996 | } |
50526df6 | 997 | #endif /* 0 */ |
1da177e4 LT |
998 | |
999 | static int __init acpi_fake_ecdt_setup(char *str) | |
1000 | { | |
1001 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1002 | return 1; |
1da177e4 | 1003 | } |
7b15f5e7 | 1004 | |
1da177e4 | 1005 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1006 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1007 | { |
02b28a33 | 1008 | int intr; |
7b15f5e7 | 1009 | |
02b28a33 | 1010 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1011 | return 0; |
1012 | ||
02b28a33 | 1013 | if (intr) { |
703959d4 | 1014 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1015 | } else { |
703959d4 | 1016 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1017 | } |
703959d4 | 1018 | acpi_ec_driver.ops.add = acpi_ec_add; |
723fe2ca LB |
1019 | printk(KERN_NOTICE PREFIX "%s mode.\n", |
1020 | intr ? "interrupt" : "polling"); | |
703959d4 | 1021 | |
9b41046c | 1022 | return 1; |
45bea155 | 1023 | } |
50526df6 | 1024 | |
53f11d4f | 1025 | __setup("ec_intr=", acpi_ec_set_intr_mode); |