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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 | |
50526df6 | 41 | ACPI_MODULE_NAME("acpi_ec") |
1da177e4 LT |
42 | #define ACPI_EC_COMPONENT 0x00100000 |
43 | #define ACPI_EC_CLASS "embedded_controller" | |
44 | #define ACPI_EC_HID "PNP0C09" | |
45 | #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" | |
46 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" | |
47 | #define ACPI_EC_FILE_INFO "info" | |
af3fd140 AS |
48 | #undef PREFIX |
49 | #define PREFIX "ACPI: EC: " | |
703959d4 | 50 | /* EC status register */ |
1da177e4 LT |
51 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
52 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 53 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 54 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
703959d4 | 55 | /* EC commands */ |
3261ff4d | 56 | enum ec_command { |
6ccedb10 AS |
57 | ACPI_EC_COMMAND_READ = 0x80, |
58 | ACPI_EC_COMMAND_WRITE = 0x81, | |
59 | ACPI_EC_BURST_ENABLE = 0x82, | |
60 | ACPI_EC_BURST_DISABLE = 0x83, | |
61 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 62 | }; |
703959d4 | 63 | /* EC events */ |
3261ff4d | 64 | enum ec_event { |
703959d4 | 65 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
6ccedb10 | 66 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
67 | }; |
68 | ||
5c406412 | 69 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 70 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 71 | |
3261ff4d | 72 | static enum ec_mode { |
6ccedb10 AS |
73 | EC_INTR = 1, /* Output buffer full */ |
74 | EC_POLL, /* Input buffer empty */ | |
3261ff4d | 75 | } acpi_ec_mode = EC_INTR; |
703959d4 | 76 | |
50526df6 LB |
77 | static int acpi_ec_remove(struct acpi_device *device, int type); |
78 | static int acpi_ec_start(struct acpi_device *device); | |
79 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 80 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
81 | |
82 | static struct acpi_driver acpi_ec_driver = { | |
50526df6 LB |
83 | .name = ACPI_EC_DRIVER_NAME, |
84 | .class = ACPI_EC_CLASS, | |
85 | .ids = ACPI_EC_HID, | |
86 | .ops = { | |
703959d4 | 87 | .add = acpi_ec_add, |
50526df6 LB |
88 | .remove = acpi_ec_remove, |
89 | .start = acpi_ec_start, | |
90 | .stop = acpi_ec_stop, | |
91 | }, | |
1da177e4 | 92 | }; |
6ffb221a DS |
93 | |
94 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
a854e08a | 95 | static struct acpi_ec { |
703959d4 DS |
96 | acpi_handle handle; |
97 | unsigned long uid; | |
a86e2772 | 98 | unsigned long gpe; |
6ffb221a DS |
99 | unsigned long command_addr; |
100 | unsigned long data_addr; | |
703959d4 | 101 | unsigned long global_lock; |
c787a855 | 102 | struct mutex lock; |
5d0c288b | 103 | atomic_t query_pending; |
703959d4 DS |
104 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ |
105 | wait_queue_head_t wait; | |
6ffb221a | 106 | } *ec_ecdt; |
703959d4 DS |
107 | |
108 | /* External interfaces use first EC only, so remember */ | |
109 | static struct acpi_device *first_ec; | |
703959d4 | 110 | |
1da177e4 LT |
111 | /* -------------------------------------------------------------------------- |
112 | Transaction Management | |
113 | -------------------------------------------------------------------------- */ | |
114 | ||
6ffb221a | 115 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 116 | { |
6ffb221a | 117 | return inb(ec->command_addr); |
451566f4 DT |
118 | } |
119 | ||
6ffb221a | 120 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 121 | { |
6ffb221a | 122 | return inb(ec->data_addr); |
7c6db5e5 DS |
123 | } |
124 | ||
6ffb221a | 125 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 126 | { |
6ffb221a | 127 | outb(command, ec->command_addr); |
45bea155 LY |
128 | } |
129 | ||
6ffb221a | 130 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 131 | { |
6ffb221a | 132 | outb(data, ec->data_addr); |
703959d4 | 133 | } |
45bea155 | 134 | |
3261ff4d | 135 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) |
6ffb221a | 136 | { |
bec5a1e0 | 137 | u8 status = acpi_ec_read_status(ec); |
78d0af33 AS |
138 | |
139 | if (event == ACPI_EC_EVENT_OBF_1) { | |
703959d4 DS |
140 | if (status & ACPI_EC_FLAG_OBF) |
141 | return 1; | |
78d0af33 | 142 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
703959d4 DS |
143 | if (!(status & ACPI_EC_FLAG_IBF)) |
144 | return 1; | |
45bea155 LY |
145 | } |
146 | ||
703959d4 | 147 | return 0; |
45bea155 | 148 | } |
451566f4 | 149 | |
3261ff4d | 150 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event) |
7c6db5e5 | 151 | { |
af3fd140 | 152 | if (acpi_ec_mode == EC_POLL) { |
50c1e113 AS |
153 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
154 | while (time_before(jiffies, delay)) { | |
af3fd140 | 155 | if (acpi_ec_check_status(ec, event)) |
7c6db5e5 DS |
156 | return 0; |
157 | } | |
af3fd140 AS |
158 | } else { |
159 | if (wait_event_timeout(ec->wait, | |
160 | acpi_ec_check_status(ec, event), | |
161 | msecs_to_jiffies(ACPI_EC_DELAY)) || | |
162 | acpi_ec_check_status(ec, event)) { | |
703959d4 | 163 | return 0; |
af3fd140 AS |
164 | } else { |
165 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
166 | " status = %d, expect_event = %d\n", | |
6ccedb10 | 167 | acpi_ec_read_status(ec), event); |
703959d4 | 168 | } |
af3fd140 | 169 | } |
1da177e4 | 170 | |
d550d98d | 171 | return -ETIME; |
1da177e4 LT |
172 | } |
173 | ||
02b28a33 | 174 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
175 | /* |
176 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
177 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
178 | */ | |
703959d4 | 179 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 180 | { |
6ffb221a DS |
181 | u8 tmp = 0; |
182 | u8 status = 0; | |
451566f4 | 183 | |
451566f4 | 184 | status = acpi_ec_read_status(ec); |
50526df6 | 185 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 186 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 187 | if (status) |
716e084e | 188 | goto end; |
703959d4 DS |
189 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
190 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
191 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 192 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 193 | return -EINVAL; |
451566f4 | 194 | } |
668d74c0 LY |
195 | } |
196 | ||
703959d4 | 197 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 198 | return 0; |
6ccedb10 | 199 | end: |
703959d4 | 200 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); |
d550d98d | 201 | return -1; |
451566f4 DT |
202 | } |
203 | ||
703959d4 | 204 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 205 | { |
6ffb221a | 206 | u8 status = 0; |
451566f4 | 207 | |
06a2a385 | 208 | status = acpi_ec_read_status(ec); |
6ccedb10 | 209 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 210 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
6ccedb10 | 211 | if (status) |
06a2a385 | 212 | goto end; |
703959d4 DS |
213 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
214 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 215 | } |
703959d4 | 216 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 217 | return 0; |
6ccedb10 | 218 | end: |
703959d4 | 219 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); |
d550d98d | 220 | return -1; |
451566f4 | 221 | } |
6ccedb10 | 222 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 223 | |
703959d4 | 224 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
225 | const u8 * wdata, unsigned wdata_len, |
226 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 227 | { |
af3fd140 | 228 | int result = 0; |
45bea155 | 229 | |
703959d4 | 230 | acpi_ec_write_cmd(ec, command); |
45bea155 | 231 | |
78d0af33 | 232 | for (; wdata_len > 0; --wdata_len) { |
703959d4 | 233 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 | 234 | if (result) { |
6ccedb10 AS |
235 | printk(KERN_ERR PREFIX |
236 | "write_cmd timeout, command = %d\n", command); | |
af3fd140 AS |
237 | goto end; |
238 | } | |
703959d4 | 239 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 240 | } |
45bea155 | 241 | |
d91df1aa | 242 | if (!rdata_len) { |
703959d4 | 243 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 | 244 | if (result) { |
6ccedb10 AS |
245 | printk(KERN_ERR PREFIX |
246 | "finish-write timeout, command = %d\n", command); | |
af3fd140 AS |
247 | goto end; |
248 | } | |
5d0c288b AS |
249 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
250 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 251 | } |
45bea155 | 252 | |
78d0af33 | 253 | for (; rdata_len > 0; --rdata_len) { |
703959d4 | 254 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
af3fd140 AS |
255 | if (result) { |
256 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
6ccedb10 | 257 | command); |
af3fd140 AS |
258 | goto end; |
259 | } | |
50526df6 | 260 | |
6ffb221a | 261 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 262 | } |
af3fd140 AS |
263 | end: |
264 | return result; | |
45bea155 LY |
265 | } |
266 | ||
3576cf61 | 267 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
268 | const u8 * wdata, unsigned wdata_len, |
269 | u8 * rdata, unsigned rdata_len) | |
1da177e4 | 270 | { |
d7a76e4c | 271 | int status; |
50526df6 | 272 | u32 glk; |
1da177e4 | 273 | |
d7a76e4c | 274 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 275 | return -EINVAL; |
1da177e4 | 276 | |
6ccedb10 AS |
277 | if (rdata) |
278 | memset(rdata, 0, rdata_len); | |
1da177e4 | 279 | |
523953b4 | 280 | mutex_lock(&ec->lock); |
703959d4 | 281 | if (ec->global_lock) { |
1da177e4 LT |
282 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
283 | if (ACPI_FAILURE(status)) | |
d550d98d | 284 | return -ENODEV; |
1da177e4 | 285 | } |
451566f4 | 286 | |
5d57a6a5 | 287 | /* Make sure GPE is enabled before doing transaction */ |
a86e2772 | 288 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
5d57a6a5 | 289 | |
703959d4 | 290 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 291 | if (status) { |
6ccedb10 AS |
292 | printk(KERN_DEBUG PREFIX |
293 | "input buffer is not empty, aborting transaction\n"); | |
451566f4 | 294 | goto end; |
716e084e | 295 | } |
1da177e4 | 296 | |
6ccedb10 AS |
297 | status = acpi_ec_transaction_unlocked(ec, command, |
298 | wdata, wdata_len, | |
299 | rdata, rdata_len); | |
1da177e4 | 300 | |
6ccedb10 | 301 | end: |
1da177e4 | 302 | |
703959d4 | 303 | if (ec->global_lock) |
1da177e4 | 304 | acpi_release_global_lock(glk); |
523953b4 | 305 | mutex_unlock(&ec->lock); |
1da177e4 | 306 | |
d550d98d | 307 | return status; |
1da177e4 LT |
308 | } |
309 | ||
6ccedb10 | 310 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
311 | { |
312 | int result; | |
313 | u8 d; | |
314 | ||
315 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
316 | &address, 1, &d, 1); | |
317 | *data = d; | |
318 | return result; | |
319 | } | |
6ffb221a | 320 | |
3576cf61 DS |
321 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
322 | { | |
6ccedb10 AS |
323 | u8 wdata[2] = { address, data }; |
324 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
3576cf61 DS |
325 | wdata, 2, NULL, 0); |
326 | } | |
327 | ||
1da177e4 LT |
328 | /* |
329 | * Externally callable EC access functions. For now, assume 1 EC only | |
330 | */ | |
6ccedb10 | 331 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 332 | { |
703959d4 | 333 | struct acpi_ec *ec; |
1da177e4 | 334 | int err; |
6ffb221a | 335 | u8 temp_data; |
1da177e4 LT |
336 | |
337 | if (!first_ec) | |
338 | return -ENODEV; | |
339 | ||
340 | ec = acpi_driver_data(first_ec); | |
341 | ||
342 | err = acpi_ec_read(ec, addr, &temp_data); | |
343 | ||
344 | if (!err) { | |
345 | *val = temp_data; | |
346 | return 0; | |
50526df6 | 347 | } else |
1da177e4 LT |
348 | return err; |
349 | } | |
50526df6 | 350 | |
1da177e4 LT |
351 | EXPORT_SYMBOL(ec_read); |
352 | ||
50526df6 | 353 | int ec_write(u8 addr, u8 val) |
1da177e4 | 354 | { |
703959d4 | 355 | struct acpi_ec *ec; |
1da177e4 LT |
356 | int err; |
357 | ||
358 | if (!first_ec) | |
359 | return -ENODEV; | |
360 | ||
361 | ec = acpi_driver_data(first_ec); | |
362 | ||
363 | err = acpi_ec_write(ec, addr, val); | |
364 | ||
365 | return err; | |
366 | } | |
50526df6 | 367 | |
1da177e4 LT |
368 | EXPORT_SYMBOL(ec_write); |
369 | ||
616362de | 370 | int ec_transaction(u8 command, |
6ccedb10 AS |
371 | const u8 * wdata, unsigned wdata_len, |
372 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 373 | { |
703959d4 | 374 | struct acpi_ec *ec; |
45bea155 | 375 | |
d7a76e4c LP |
376 | if (!first_ec) |
377 | return -ENODEV; | |
45bea155 | 378 | |
d7a76e4c | 379 | ec = acpi_driver_data(first_ec); |
45bea155 | 380 | |
3576cf61 DS |
381 | return acpi_ec_transaction(ec, command, wdata, |
382 | wdata_len, rdata, rdata_len); | |
45bea155 | 383 | } |
1da177e4 | 384 | |
ab9e43c6 LP |
385 | EXPORT_SYMBOL(ec_transaction); |
386 | ||
6ccedb10 | 387 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
388 | { |
389 | int result; | |
6ccedb10 | 390 | u8 d; |
1da177e4 | 391 | |
6ccedb10 AS |
392 | if (!ec || !data) |
393 | return -EINVAL; | |
1da177e4 | 394 | |
6ccedb10 AS |
395 | /* |
396 | * Query the EC to find out which _Qxx method we need to evaluate. | |
397 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
398 | * bit to be cleared (and thus clearing the interrupt source). | |
399 | */ | |
716e084e | 400 | |
6ccedb10 AS |
401 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
402 | if (result) | |
403 | return result; | |
1da177e4 | 404 | |
6ccedb10 AS |
405 | if (!d) |
406 | return -ENODATA; | |
1da177e4 | 407 | |
6ccedb10 AS |
408 | *data = d; |
409 | return 0; | |
1da177e4 LT |
410 | } |
411 | ||
1da177e4 LT |
412 | /* -------------------------------------------------------------------------- |
413 | Event Management | |
414 | -------------------------------------------------------------------------- */ | |
415 | ||
50526df6 | 416 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 417 | { |
703959d4 | 418 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
6ffb221a | 419 | u8 value = 0; |
5d0c288b | 420 | char object_name[8]; |
45bea155 | 421 | |
5d0c288b | 422 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 423 | return; |
45bea155 | 424 | |
6ffb221a | 425 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 426 | |
c6e19194 | 427 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 428 | |
703959d4 | 429 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 430 | } |
1da177e4 | 431 | |
50526df6 | 432 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 433 | { |
50526df6 | 434 | acpi_status status = AE_OK; |
6ffb221a | 435 | u8 value; |
703959d4 | 436 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 437 | |
8e0341ba | 438 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 439 | wake_up(&ec->wait); |
451566f4 DT |
440 | } |
441 | ||
bec5a1e0 | 442 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
443 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
444 | atomic_set(&ec->query_pending, 1); | |
6ccedb10 AS |
445 | status = |
446 | acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, | |
447 | ec); | |
50526df6 | 448 | } |
e41334c0 | 449 | |
451566f4 | 450 | return status == AE_OK ? |
50526df6 | 451 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
452 | } |
453 | ||
454 | /* -------------------------------------------------------------------------- | |
455 | Address Space Management | |
456 | -------------------------------------------------------------------------- */ | |
457 | ||
458 | static acpi_status | |
50526df6 LB |
459 | acpi_ec_space_setup(acpi_handle region_handle, |
460 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
461 | { |
462 | /* | |
463 | * The EC object is in the handler context and is needed | |
464 | * when calling the acpi_ec_space_handler. | |
465 | */ | |
50526df6 LB |
466 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
467 | handler_context : NULL; | |
1da177e4 LT |
468 | |
469 | return AE_OK; | |
470 | } | |
471 | ||
1da177e4 | 472 | static acpi_status |
50526df6 LB |
473 | acpi_ec_space_handler(u32 function, |
474 | acpi_physical_address address, | |
475 | u32 bit_width, | |
476 | acpi_integer * value, | |
477 | void *handler_context, void *region_context) | |
1da177e4 | 478 | { |
50526df6 | 479 | int result = 0; |
703959d4 | 480 | struct acpi_ec *ec = NULL; |
50526df6 LB |
481 | u64 temp = *value; |
482 | acpi_integer f_v = 0; | |
483 | int i = 0; | |
1da177e4 | 484 | |
1da177e4 | 485 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 486 | return AE_BAD_PARAMETER; |
1da177e4 | 487 | |
fa9cd547 | 488 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 489 | return AE_BAD_PARAMETER; |
1da177e4 LT |
490 | } |
491 | ||
703959d4 | 492 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 493 | |
50526df6 | 494 | next_byte: |
1da177e4 LT |
495 | switch (function) { |
496 | case ACPI_READ: | |
fa9cd547 | 497 | temp = 0; |
6ccedb10 | 498 | result = acpi_ec_read(ec, (u8) address, (u8 *) & temp); |
1da177e4 LT |
499 | break; |
500 | case ACPI_WRITE: | |
fa9cd547 | 501 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
502 | break; |
503 | default: | |
504 | result = -EINVAL; | |
505 | goto out; | |
506 | break; | |
507 | } | |
508 | ||
509 | bit_width -= 8; | |
fa9cd547 LY |
510 | if (bit_width) { |
511 | if (function == ACPI_READ) | |
512 | f_v |= temp << 8 * i; | |
513 | if (function == ACPI_WRITE) | |
514 | temp >>= 8; | |
1da177e4 | 515 | i++; |
83ea7445 | 516 | address++; |
1da177e4 LT |
517 | goto next_byte; |
518 | } | |
519 | ||
fa9cd547 LY |
520 | if (function == ACPI_READ) { |
521 | f_v |= temp << 8 * i; | |
1da177e4 LT |
522 | *value = f_v; |
523 | } | |
524 | ||
50526df6 | 525 | out: |
1da177e4 LT |
526 | switch (result) { |
527 | case -EINVAL: | |
d550d98d | 528 | return AE_BAD_PARAMETER; |
1da177e4 LT |
529 | break; |
530 | case -ENODEV: | |
d550d98d | 531 | return AE_NOT_FOUND; |
1da177e4 LT |
532 | break; |
533 | case -ETIME: | |
d550d98d | 534 | return AE_TIME; |
1da177e4 LT |
535 | break; |
536 | default: | |
d550d98d | 537 | return AE_OK; |
1da177e4 | 538 | } |
1da177e4 LT |
539 | } |
540 | ||
1da177e4 LT |
541 | /* -------------------------------------------------------------------------- |
542 | FS Interface (/proc) | |
543 | -------------------------------------------------------------------------- */ | |
544 | ||
50526df6 | 545 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 546 | |
50526df6 | 547 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 548 | { |
703959d4 | 549 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 550 | |
1da177e4 LT |
551 | if (!ec) |
552 | goto end; | |
553 | ||
6ccedb10 | 554 | seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe); |
1da177e4 | 555 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ccedb10 | 556 | (u32) ec->command_addr, (u32) ec->data_addr); |
1da177e4 | 557 | seq_printf(seq, "use global lock: %s\n", |
703959d4 | 558 | ec->global_lock ? "yes" : "no"); |
a86e2772 | 559 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
1da177e4 | 560 | |
50526df6 | 561 | end: |
d550d98d | 562 | return 0; |
1da177e4 LT |
563 | } |
564 | ||
565 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
566 | { | |
567 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
568 | } | |
569 | ||
703959d4 | 570 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
571 | .open = acpi_ec_info_open_fs, |
572 | .read = seq_read, | |
573 | .llseek = seq_lseek, | |
574 | .release = single_release, | |
1da177e4 LT |
575 | .owner = THIS_MODULE, |
576 | }; | |
577 | ||
50526df6 | 578 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 579 | { |
50526df6 | 580 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 581 | |
1da177e4 LT |
582 | if (!acpi_device_dir(device)) { |
583 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 584 | acpi_ec_dir); |
1da177e4 | 585 | if (!acpi_device_dir(device)) |
d550d98d | 586 | return -ENODEV; |
1da177e4 LT |
587 | } |
588 | ||
589 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 590 | acpi_device_dir(device)); |
1da177e4 | 591 | if (!entry) |
d550d98d | 592 | return -ENODEV; |
1da177e4 LT |
593 | else { |
594 | entry->proc_fops = &acpi_ec_info_ops; | |
595 | entry->data = acpi_driver_data(device); | |
596 | entry->owner = THIS_MODULE; | |
597 | } | |
598 | ||
d550d98d | 599 | return 0; |
1da177e4 LT |
600 | } |
601 | ||
50526df6 | 602 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 603 | { |
1da177e4 LT |
604 | |
605 | if (acpi_device_dir(device)) { | |
606 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
607 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
608 | acpi_device_dir(device) = NULL; | |
609 | } | |
610 | ||
d550d98d | 611 | return 0; |
1da177e4 LT |
612 | } |
613 | ||
1da177e4 LT |
614 | /* -------------------------------------------------------------------------- |
615 | Driver Interface | |
616 | -------------------------------------------------------------------------- */ | |
617 | ||
703959d4 | 618 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 619 | { |
50526df6 LB |
620 | int result = 0; |
621 | acpi_status status = AE_OK; | |
703959d4 | 622 | struct acpi_ec *ec = NULL; |
45bea155 | 623 | |
45bea155 | 624 | if (!device) |
d550d98d | 625 | return -EINVAL; |
45bea155 | 626 | |
36bcbec7 | 627 | ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 628 | if (!ec) |
d550d98d | 629 | return -ENOMEM; |
703959d4 DS |
630 | |
631 | ec->handle = device->handle; | |
632 | ec->uid = -1; | |
c787a855 | 633 | mutex_init(&ec->lock); |
5d0c288b | 634 | atomic_set(&ec->query_pending, 0); |
703959d4 DS |
635 | if (acpi_ec_mode == EC_INTR) { |
636 | atomic_set(&ec->leaving_burst, 1); | |
637 | init_waitqueue_head(&ec->wait); | |
45bea155 | 638 | } |
1da177e4 LT |
639 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
640 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
641 | acpi_driver_data(device) = ec; | |
642 | ||
643 | /* Use the global lock for all EC transactions? */ | |
6ccedb10 | 644 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); |
1da177e4 | 645 | |
ff2fc3e9 JS |
646 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
647 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
648 | if (ec_ecdt) { | |
1da177e4 | 649 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
650 | ACPI_ADR_SPACE_EC, |
651 | &acpi_ec_space_handler); | |
451566f4 | 652 | |
a86e2772 | 653 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 654 | &acpi_ec_gpe_handler); |
1da177e4 LT |
655 | |
656 | kfree(ec_ecdt); | |
657 | } | |
658 | ||
659 | /* Get GPE bit assignment (EC events). */ | |
660 | /* TODO: Add support for _GPE returning a package */ | |
6ccedb10 | 661 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe); |
1da177e4 | 662 | if (ACPI_FAILURE(status)) { |
6ccedb10 AS |
663 | ACPI_EXCEPTION((AE_INFO, status, |
664 | "Obtaining GPE bit assignment")); | |
1da177e4 LT |
665 | result = -ENODEV; |
666 | goto end; | |
667 | } | |
668 | ||
669 | result = acpi_ec_add_fs(device); | |
670 | if (result) | |
671 | goto end; | |
672 | ||
703959d4 | 673 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
6ccedb10 AS |
674 | acpi_device_name(device), acpi_device_bid(device), |
675 | (u32) ec->gpe)); | |
1da177e4 LT |
676 | |
677 | if (!first_ec) | |
678 | first_ec = device; | |
679 | ||
6ccedb10 | 680 | end: |
1da177e4 LT |
681 | if (result) |
682 | kfree(ec); | |
683 | ||
d550d98d | 684 | return result; |
1da177e4 LT |
685 | } |
686 | ||
50526df6 | 687 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 688 | { |
703959d4 | 689 | struct acpi_ec *ec = NULL; |
1da177e4 | 690 | |
1da177e4 | 691 | if (!device) |
d550d98d | 692 | return -EINVAL; |
1da177e4 LT |
693 | |
694 | ec = acpi_driver_data(device); | |
695 | ||
696 | acpi_ec_remove_fs(device); | |
697 | ||
698 | kfree(ec); | |
699 | ||
d550d98d | 700 | return 0; |
1da177e4 LT |
701 | } |
702 | ||
1da177e4 | 703 | static acpi_status |
50526df6 | 704 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 705 | { |
703959d4 | 706 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 707 | |
50eca3eb | 708 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
709 | return AE_OK; |
710 | } | |
711 | ||
712 | /* | |
713 | * The first address region returned is the data port, and | |
714 | * the second address region returned is the status/command | |
715 | * port. | |
716 | */ | |
6ffb221a DS |
717 | if (ec->data_addr == 0) { |
718 | ec->data_addr = resource->data.io.minimum; | |
719 | } else if (ec->command_addr == 0) { | |
720 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
721 | } else { |
722 | return AE_CTRL_TERMINATE; | |
723 | } | |
724 | ||
1da177e4 LT |
725 | return AE_OK; |
726 | } | |
727 | ||
50526df6 | 728 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 729 | { |
50526df6 | 730 | acpi_status status = AE_OK; |
703959d4 | 731 | struct acpi_ec *ec = NULL; |
1da177e4 | 732 | |
1da177e4 | 733 | if (!device) |
d550d98d | 734 | return -EINVAL; |
1da177e4 LT |
735 | |
736 | ec = acpi_driver_data(device); | |
737 | ||
738 | if (!ec) | |
d550d98d | 739 | return -EINVAL; |
1da177e4 LT |
740 | |
741 | /* | |
742 | * Get I/O port addresses. Convert to GAS format. | |
743 | */ | |
703959d4 | 744 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 745 | acpi_ec_io_ports, ec); |
6ffb221a | 746 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
747 | ACPI_EXCEPTION((AE_INFO, status, |
748 | "Error getting I/O port addresses")); | |
d550d98d | 749 | return -ENODEV; |
1da177e4 LT |
750 | } |
751 | ||
6ffb221a | 752 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
a86e2772 | 753 | ec->gpe, ec->command_addr, ec->data_addr)); |
1da177e4 LT |
754 | |
755 | /* | |
756 | * Install GPE handler | |
757 | */ | |
a86e2772 | 758 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
50526df6 LB |
759 | ACPI_GPE_EDGE_TRIGGERED, |
760 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 761 | if (ACPI_FAILURE(status)) { |
d550d98d | 762 | return -ENODEV; |
1da177e4 | 763 | } |
a86e2772 AS |
764 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
765 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1da177e4 | 766 | |
703959d4 | 767 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
768 | ACPI_ADR_SPACE_EC, |
769 | &acpi_ec_space_handler, | |
770 | &acpi_ec_space_setup, ec); | |
1da177e4 | 771 | if (ACPI_FAILURE(status)) { |
6ccedb10 | 772 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); |
d550d98d | 773 | return -ENODEV; |
1da177e4 LT |
774 | } |
775 | ||
d550d98d | 776 | return AE_OK; |
1da177e4 LT |
777 | } |
778 | ||
50526df6 | 779 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 780 | { |
50526df6 | 781 | acpi_status status = AE_OK; |
703959d4 | 782 | struct acpi_ec *ec = NULL; |
1da177e4 | 783 | |
1da177e4 | 784 | if (!device) |
d550d98d | 785 | return -EINVAL; |
1da177e4 LT |
786 | |
787 | ec = acpi_driver_data(device); | |
788 | ||
703959d4 | 789 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
790 | ACPI_ADR_SPACE_EC, |
791 | &acpi_ec_space_handler); | |
1da177e4 | 792 | if (ACPI_FAILURE(status)) |
d550d98d | 793 | return -ENODEV; |
1da177e4 | 794 | |
6ccedb10 | 795 | status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); |
1da177e4 | 796 | if (ACPI_FAILURE(status)) |
d550d98d | 797 | return -ENODEV; |
1da177e4 | 798 | |
d550d98d | 799 | return 0; |
1da177e4 LT |
800 | } |
801 | ||
802 | static acpi_status __init | |
50526df6 LB |
803 | acpi_fake_ecdt_callback(acpi_handle handle, |
804 | u32 Level, void *context, void **retval) | |
1da177e4 | 805 | { |
50526df6 | 806 | acpi_status status; |
1da177e4 | 807 | |
c787a855 | 808 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
809 | if (acpi_ec_mode == EC_INTR) { |
810 | init_waitqueue_head(&ec_ecdt->wait); | |
811 | } | |
1da177e4 | 812 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 813 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
814 | if (ACPI_FAILURE(status)) |
815 | return status; | |
1da177e4 | 816 | |
703959d4 DS |
817 | ec_ecdt->uid = -1; |
818 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 819 | |
6ccedb10 | 820 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe); |
1da177e4 LT |
821 | if (ACPI_FAILURE(status)) |
822 | return status; | |
703959d4 DS |
823 | ec_ecdt->global_lock = TRUE; |
824 | ec_ecdt->handle = handle; | |
1da177e4 | 825 | |
6ffb221a | 826 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
6ccedb10 AS |
827 | ec_ecdt->gpe, ec_ecdt->command_addr, |
828 | ec_ecdt->data_addr)); | |
1da177e4 LT |
829 | |
830 | return AE_CTRL_TERMINATE; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
835 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
836 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
837 | * required, but if EC regison is accessed early, it is required. | |
838 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
839 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
840 | * op region (since _REG isn't invoked yet). The assumption is true for | |
841 | * all systems found. | |
842 | */ | |
50526df6 | 843 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 844 | { |
50526df6 LB |
845 | acpi_status status; |
846 | int ret = 0; | |
1da177e4 | 847 | |
703959d4 | 848 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 849 | |
36bcbec7 | 850 | ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
851 | if (!ec_ecdt) { |
852 | ret = -ENOMEM; | |
853 | goto error; | |
854 | } | |
1da177e4 | 855 | |
50526df6 LB |
856 | status = acpi_get_devices(ACPI_EC_HID, |
857 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
858 | if (ACPI_FAILURE(status)) { |
859 | kfree(ec_ecdt); | |
860 | ec_ecdt = NULL; | |
861 | ret = -ENODEV; | |
703959d4 | 862 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
863 | goto error; |
864 | } | |
865 | return 0; | |
6ccedb10 | 866 | error: |
1da177e4 LT |
867 | return ret; |
868 | } | |
869 | ||
50526df6 | 870 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 871 | { |
50526df6 LB |
872 | acpi_status status; |
873 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 874 | |
ad71860a | 875 | status = acpi_get_table("ECDT", 1, (struct acpi_table_header **)&ecdt_ptr); |
45bea155 LY |
876 | if (ACPI_FAILURE(status)) |
877 | return -ENODEV; | |
878 | ||
703959d4 | 879 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
880 | |
881 | /* | |
882 | * Generate a temporary ec context to use until the namespace is scanned | |
883 | */ | |
36bcbec7 | 884 | ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
885 | if (!ec_ecdt) |
886 | return -ENOMEM; | |
45bea155 | 887 | |
c787a855 | 888 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
889 | if (acpi_ec_mode == EC_INTR) { |
890 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 891 | } |
ad363f80 AS |
892 | ec_ecdt->command_addr = ecdt_ptr->control.address; |
893 | ec_ecdt->data_addr = ecdt_ptr->data.address; | |
894 | ec_ecdt->gpe = ecdt_ptr->gpe; | |
1da177e4 | 895 | /* use the GL just to be safe */ |
703959d4 DS |
896 | ec_ecdt->global_lock = TRUE; |
897 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 898 | |
ad363f80 | 899 | status = acpi_get_handle(NULL, ecdt_ptr->id, &ec_ecdt->handle); |
1da177e4 LT |
900 | if (ACPI_FAILURE(status)) { |
901 | goto error; | |
902 | } | |
903 | ||
904 | return 0; | |
6ccedb10 | 905 | error: |
703959d4 | 906 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
907 | kfree(ec_ecdt); |
908 | ec_ecdt = NULL; | |
909 | ||
910 | return -ENODEV; | |
911 | } | |
912 | ||
913 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 914 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 915 | { |
50526df6 LB |
916 | acpi_status status; |
917 | int ret; | |
1da177e4 LT |
918 | |
919 | ret = acpi_ec_get_real_ecdt(); | |
920 | /* Try to make a fake ECDT */ | |
921 | if (ret && acpi_fake_ecdt_enabled) { | |
922 | ret = acpi_ec_fake_ecdt(); | |
923 | } | |
924 | ||
925 | if (ret) | |
926 | return 0; | |
927 | ||
928 | /* | |
929 | * Install GPE handler | |
930 | */ | |
a86e2772 | 931 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 LB |
932 | ACPI_GPE_EDGE_TRIGGERED, |
933 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
934 | if (ACPI_FAILURE(status)) { |
935 | goto error; | |
936 | } | |
a86e2772 AS |
937 | acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME); |
938 | acpi_enable_gpe(NULL, ec_ecdt->gpe, ACPI_NOT_ISR); | |
50526df6 LB |
939 | |
940 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
941 | ACPI_ADR_SPACE_EC, | |
942 | &acpi_ec_space_handler, | |
943 | &acpi_ec_space_setup, | |
944 | ec_ecdt); | |
1da177e4 | 945 | if (ACPI_FAILURE(status)) { |
a86e2772 | 946 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 947 | &acpi_ec_gpe_handler); |
1da177e4 LT |
948 | goto error; |
949 | } | |
950 | ||
951 | return 0; | |
952 | ||
50526df6 | 953 | error: |
703959d4 | 954 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
955 | kfree(ec_ecdt); |
956 | ec_ecdt = NULL; | |
957 | ||
958 | return -ENODEV; | |
959 | } | |
960 | ||
50526df6 | 961 | static int __init acpi_ec_init(void) |
1da177e4 | 962 | { |
50526df6 | 963 | int result = 0; |
1da177e4 | 964 | |
1da177e4 | 965 | if (acpi_disabled) |
d550d98d | 966 | return 0; |
1da177e4 LT |
967 | |
968 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
969 | if (!acpi_ec_dir) | |
d550d98d | 970 | return -ENODEV; |
1da177e4 LT |
971 | |
972 | /* Now register the driver for the EC */ | |
973 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
974 | if (result < 0) { | |
975 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 976 | return -ENODEV; |
1da177e4 LT |
977 | } |
978 | ||
d550d98d | 979 | return result; |
1da177e4 LT |
980 | } |
981 | ||
982 | subsys_initcall(acpi_ec_init); | |
983 | ||
984 | /* EC driver currently not unloadable */ | |
985 | #if 0 | |
50526df6 | 986 | static void __exit acpi_ec_exit(void) |
1da177e4 | 987 | { |
1da177e4 LT |
988 | |
989 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
990 | ||
991 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
992 | ||
d550d98d | 993 | return; |
1da177e4 | 994 | } |
50526df6 | 995 | #endif /* 0 */ |
1da177e4 LT |
996 | |
997 | static int __init acpi_fake_ecdt_setup(char *str) | |
998 | { | |
999 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1000 | return 1; |
1da177e4 | 1001 | } |
7b15f5e7 | 1002 | |
1da177e4 | 1003 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1004 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1005 | { |
02b28a33 | 1006 | int intr; |
7b15f5e7 | 1007 | |
02b28a33 | 1008 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1009 | return 0; |
1010 | ||
02b28a33 | 1011 | if (intr) { |
703959d4 | 1012 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1013 | } else { |
703959d4 | 1014 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1015 | } |
703959d4 | 1016 | acpi_ec_driver.ops.add = acpi_ec_add; |
723fe2ca LB |
1017 | printk(KERN_NOTICE PREFIX "%s mode.\n", |
1018 | intr ? "interrupt" : "polling"); | |
703959d4 | 1019 | |
9b41046c | 1020 | return 1; |
45bea155 | 1021 | } |
50526df6 | 1022 | |
53f11d4f | 1023 | __setup("ec_intr=", acpi_ec_set_intr_mode); |