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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" | |
703959d4 DS |
48 | |
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 DS |
54 | |
55 | /* EC commands */ | |
1da177e4 LT |
56 | #define ACPI_EC_COMMAND_READ 0x80 |
57 | #define ACPI_EC_COMMAND_WRITE 0x81 | |
451566f4 DT |
58 | #define ACPI_EC_BURST_ENABLE 0x82 |
59 | #define ACPI_EC_BURST_DISABLE 0x83 | |
1da177e4 | 60 | #define ACPI_EC_COMMAND_QUERY 0x84 |
703959d4 DS |
61 | |
62 | /* EC events */ | |
63 | enum { | |
64 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ | |
65 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ | |
66 | }; | |
67 | ||
5c406412 | 68 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 DS |
69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
70 | #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ | |
5c406412 | 71 | #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 100ms max. during EC ops */ |
703959d4 DS |
72 | |
73 | enum { | |
74 | EC_INTR = 1, /* Output buffer full */ | |
6ffb221a | 75 | EC_POLL, /* Input buffer empty */ |
703959d4 DS |
76 | }; |
77 | ||
50526df6 LB |
78 | static int acpi_ec_remove(struct acpi_device *device, int type); |
79 | static int acpi_ec_start(struct acpi_device *device); | |
80 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 81 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
82 | |
83 | static struct acpi_driver acpi_ec_driver = { | |
50526df6 LB |
84 | .name = ACPI_EC_DRIVER_NAME, |
85 | .class = ACPI_EC_CLASS, | |
86 | .ids = ACPI_EC_HID, | |
87 | .ops = { | |
703959d4 | 88 | .add = acpi_ec_add, |
50526df6 LB |
89 | .remove = acpi_ec_remove, |
90 | .start = acpi_ec_start, | |
91 | .stop = acpi_ec_stop, | |
92 | }, | |
1da177e4 | 93 | }; |
6ffb221a DS |
94 | |
95 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
703959d4 DS |
96 | struct acpi_ec { |
97 | acpi_handle handle; | |
98 | unsigned long uid; | |
99 | unsigned long gpe_bit; | |
6ffb221a DS |
100 | unsigned long command_addr; |
101 | unsigned long data_addr; | |
703959d4 DS |
102 | unsigned long global_lock; |
103 | struct semaphore sem; | |
104 | unsigned int expect_event; | |
105 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ | |
106 | wait_queue_head_t wait; | |
6ffb221a | 107 | } *ec_ecdt; |
703959d4 DS |
108 | |
109 | /* External interfaces use first EC only, so remember */ | |
110 | static struct acpi_device *first_ec; | |
111 | static int acpi_ec_mode = EC_INTR; | |
112 | ||
1da177e4 LT |
113 | /* -------------------------------------------------------------------------- |
114 | Transaction Management | |
115 | -------------------------------------------------------------------------- */ | |
116 | ||
6ffb221a | 117 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 118 | { |
6ffb221a | 119 | return inb(ec->command_addr); |
451566f4 DT |
120 | } |
121 | ||
6ffb221a | 122 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 123 | { |
6ffb221a | 124 | return inb(ec->data_addr); |
7c6db5e5 DS |
125 | } |
126 | ||
6ffb221a | 127 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 128 | { |
6ffb221a | 129 | outb(command, ec->command_addr); |
45bea155 LY |
130 | } |
131 | ||
6ffb221a | 132 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 133 | { |
6ffb221a | 134 | outb(data, ec->data_addr); |
703959d4 | 135 | } |
45bea155 | 136 | |
bec5a1e0 | 137 | static int acpi_ec_check_status(struct acpi_ec *ec, u8 event) |
6ffb221a | 138 | { |
bec5a1e0 | 139 | u8 status = acpi_ec_read_status(ec); |
45bea155 | 140 | switch (event) { |
703959d4 DS |
141 | case ACPI_EC_EVENT_OBF_1: |
142 | if (status & ACPI_EC_FLAG_OBF) | |
143 | return 1; | |
45bea155 | 144 | break; |
703959d4 DS |
145 | case ACPI_EC_EVENT_IBF_0: |
146 | if (!(status & ACPI_EC_FLAG_IBF)) | |
147 | return 1; | |
45bea155 LY |
148 | break; |
149 | default: | |
703959d4 | 150 | break; |
45bea155 LY |
151 | } |
152 | ||
703959d4 | 153 | return 0; |
45bea155 | 154 | } |
451566f4 | 155 | |
703959d4 | 156 | static int acpi_ec_wait(struct acpi_ec *ec, u8 event) |
7c6db5e5 | 157 | { |
703959d4 DS |
158 | int i = (acpi_ec_mode == EC_POLL) ? ACPI_EC_UDELAY_COUNT : 0; |
159 | long time_left; | |
451566f4 | 160 | |
703959d4 | 161 | ec->expect_event = event; |
bec5a1e0 | 162 | if (acpi_ec_check_status(ec, event)) { |
703959d4 DS |
163 | ec->expect_event = 0; |
164 | return 0; | |
716e084e LY |
165 | } |
166 | ||
703959d4 DS |
167 | do { |
168 | if (acpi_ec_mode == EC_POLL) { | |
169 | udelay(ACPI_EC_UDELAY); | |
170 | } else { | |
171 | time_left = wait_event_timeout(ec->wait, | |
172 | !ec->expect_event, | |
173 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
174 | if (time_left > 0) { | |
175 | ec->expect_event = 0; | |
7c6db5e5 | 176 | return 0; |
703959d4 | 177 | } |
7c6db5e5 | 178 | } |
bec5a1e0 | 179 | if (acpi_ec_check_status(ec, event)) { |
703959d4 DS |
180 | ec->expect_event = 0; |
181 | return 0; | |
182 | } | |
183 | } while (--i > 0); | |
184 | ||
185 | ec->expect_event = 0; | |
1da177e4 | 186 | |
d550d98d | 187 | return -ETIME; |
1da177e4 LT |
188 | } |
189 | ||
02b28a33 | 190 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
191 | /* |
192 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
193 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
194 | */ | |
703959d4 | 195 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 196 | { |
6ffb221a DS |
197 | u8 tmp = 0; |
198 | u8 status = 0; | |
451566f4 | 199 | |
451566f4 DT |
200 | |
201 | status = acpi_ec_read_status(ec); | |
50526df6 | 202 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 203 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 204 | if (status) |
716e084e | 205 | goto end; |
703959d4 DS |
206 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
207 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
208 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 209 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 210 | return -EINVAL; |
451566f4 | 211 | } |
668d74c0 LY |
212 | } |
213 | ||
703959d4 | 214 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 215 | return 0; |
703959d4 DS |
216 | end: |
217 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); | |
d550d98d | 218 | return -1; |
451566f4 DT |
219 | } |
220 | ||
703959d4 | 221 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 222 | { |
6ffb221a | 223 | u8 status = 0; |
451566f4 | 224 | |
451566f4 | 225 | |
06a2a385 LY |
226 | status = acpi_ec_read_status(ec); |
227 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
703959d4 | 228 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
06a2a385 LY |
229 | if(status) |
230 | goto end; | |
703959d4 DS |
231 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
232 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 233 | } |
703959d4 | 234 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 235 | return 0; |
703959d4 DS |
236 | end: |
237 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); | |
d550d98d | 238 | return -1; |
451566f4 | 239 | } |
02b28a33 | 240 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 241 | |
703959d4 | 242 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
3576cf61 DS |
243 | const u8 *wdata, unsigned wdata_len, |
244 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 245 | { |
d7a76e4c | 246 | int result; |
45bea155 | 247 | |
703959d4 | 248 | acpi_ec_write_cmd(ec, command); |
45bea155 | 249 | |
7c6db5e5 | 250 | for (; wdata_len > 0; wdata_len --) { |
703959d4 | 251 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
252 | if (result) |
253 | return result; | |
703959d4 | 254 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 255 | } |
45bea155 | 256 | |
d91df1aa | 257 | if (!rdata_len) { |
703959d4 | 258 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
259 | if (result) |
260 | return result; | |
261 | } | |
45bea155 | 262 | |
7c6db5e5 | 263 | for (; rdata_len > 0; rdata_len --) { |
703959d4 | 264 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
7c6db5e5 DS |
265 | if (result) |
266 | return result; | |
50526df6 | 267 | |
6ffb221a | 268 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 269 | } |
45bea155 | 270 | |
7c6db5e5 | 271 | return 0; |
45bea155 LY |
272 | } |
273 | ||
3576cf61 DS |
274 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
275 | const u8 *wdata, unsigned wdata_len, | |
276 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 277 | { |
d7a76e4c | 278 | int status; |
50526df6 | 279 | u32 glk; |
1da177e4 | 280 | |
d7a76e4c | 281 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 282 | return -EINVAL; |
1da177e4 | 283 | |
d7a76e4c LP |
284 | if (rdata) |
285 | memset(rdata, 0, rdata_len); | |
1da177e4 | 286 | |
703959d4 | 287 | if (ec->global_lock) { |
1da177e4 LT |
288 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
289 | if (ACPI_FAILURE(status)) | |
d550d98d | 290 | return -ENODEV; |
1da177e4 | 291 | } |
703959d4 | 292 | down(&ec->sem); |
451566f4 | 293 | |
5d57a6a5 AS |
294 | /* Make sure GPE is enabled before doing transaction */ |
295 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
296 | ||
703959d4 | 297 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 298 | if (status) { |
3576cf61 | 299 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 300 | goto end; |
716e084e | 301 | } |
1da177e4 | 302 | |
d7a76e4c LP |
303 | status = acpi_ec_transaction_unlocked(ec, command, |
304 | wdata, wdata_len, | |
305 | rdata, rdata_len); | |
1da177e4 | 306 | |
d7a76e4c | 307 | end: |
703959d4 | 308 | up(&ec->sem); |
1da177e4 | 309 | |
703959d4 | 310 | if (ec->global_lock) |
1da177e4 LT |
311 | acpi_release_global_lock(glk); |
312 | ||
d550d98d | 313 | return status; |
1da177e4 LT |
314 | } |
315 | ||
6ffb221a | 316 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
317 | { |
318 | int result; | |
319 | u8 d; | |
320 | ||
321 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
322 | &address, 1, &d, 1); | |
323 | *data = d; | |
324 | return result; | |
325 | } | |
6ffb221a | 326 | |
3576cf61 DS |
327 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
328 | { | |
329 | u8 wdata[2] = { address, data }; | |
330 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
331 | wdata, 2, NULL, 0); | |
332 | } | |
333 | ||
1da177e4 LT |
334 | /* |
335 | * Externally callable EC access functions. For now, assume 1 EC only | |
336 | */ | |
6ffb221a | 337 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 338 | { |
703959d4 | 339 | struct acpi_ec *ec; |
1da177e4 | 340 | int err; |
6ffb221a | 341 | u8 temp_data; |
1da177e4 LT |
342 | |
343 | if (!first_ec) | |
344 | return -ENODEV; | |
345 | ||
346 | ec = acpi_driver_data(first_ec); | |
347 | ||
348 | err = acpi_ec_read(ec, addr, &temp_data); | |
349 | ||
350 | if (!err) { | |
351 | *val = temp_data; | |
352 | return 0; | |
50526df6 | 353 | } else |
1da177e4 LT |
354 | return err; |
355 | } | |
50526df6 | 356 | |
1da177e4 LT |
357 | EXPORT_SYMBOL(ec_read); |
358 | ||
50526df6 | 359 | int ec_write(u8 addr, u8 val) |
1da177e4 | 360 | { |
703959d4 | 361 | struct acpi_ec *ec; |
1da177e4 LT |
362 | int err; |
363 | ||
364 | if (!first_ec) | |
365 | return -ENODEV; | |
366 | ||
367 | ec = acpi_driver_data(first_ec); | |
368 | ||
369 | err = acpi_ec_write(ec, addr, val); | |
370 | ||
371 | return err; | |
372 | } | |
50526df6 | 373 | |
1da177e4 LT |
374 | EXPORT_SYMBOL(ec_write); |
375 | ||
d7a76e4c LP |
376 | extern int ec_transaction(u8 command, |
377 | const u8 *wdata, unsigned wdata_len, | |
378 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 379 | { |
703959d4 | 380 | struct acpi_ec *ec; |
45bea155 | 381 | |
d7a76e4c LP |
382 | if (!first_ec) |
383 | return -ENODEV; | |
45bea155 | 384 | |
d7a76e4c | 385 | ec = acpi_driver_data(first_ec); |
45bea155 | 386 | |
3576cf61 DS |
387 | return acpi_ec_transaction(ec, command, wdata, |
388 | wdata_len, rdata, rdata_len); | |
45bea155 | 389 | } |
1da177e4 | 390 | |
ab9e43c6 LP |
391 | EXPORT_SYMBOL(ec_transaction); |
392 | ||
6ffb221a | 393 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
3576cf61 DS |
394 | { |
395 | int result; | |
d7a76e4c | 396 | u8 d; |
1da177e4 | 397 | |
d7a76e4c LP |
398 | if (!ec || !data) |
399 | return -EINVAL; | |
1da177e4 | 400 | |
d7a76e4c LP |
401 | /* |
402 | * Query the EC to find out which _Qxx method we need to evaluate. | |
403 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
404 | * bit to be cleared (and thus clearing the interrupt source). | |
405 | */ | |
716e084e | 406 | |
d7a76e4c LP |
407 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
408 | if (result) | |
409 | return result; | |
1da177e4 | 410 | |
d7a76e4c LP |
411 | if (!d) |
412 | return -ENODATA; | |
1da177e4 | 413 | |
d7a76e4c LP |
414 | *data = d; |
415 | return 0; | |
1da177e4 LT |
416 | } |
417 | ||
1da177e4 LT |
418 | /* -------------------------------------------------------------------------- |
419 | Event Management | |
420 | -------------------------------------------------------------------------- */ | |
421 | ||
8e0341ba | 422 | struct acpi_ec_query_data { |
50526df6 LB |
423 | acpi_handle handle; |
424 | u8 data; | |
1da177e4 LT |
425 | }; |
426 | ||
50526df6 | 427 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 428 | { |
703959d4 | 429 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
6ffb221a DS |
430 | u8 value = 0; |
431 | static char object_name[8]; | |
45bea155 | 432 | |
6ffb221a | 433 | if (!ec) |
45bea155 LY |
434 | goto end; |
435 | ||
703959d4 | 436 | value = acpi_ec_read_status(ec); |
45bea155 | 437 | |
45bea155 LY |
438 | if (!(value & ACPI_EC_FLAG_SCI)) |
439 | goto end; | |
440 | ||
441 | if (acpi_ec_query(ec, &value)) | |
442 | goto end; | |
443 | ||
6ffb221a | 444 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 445 | |
8e0341ba | 446 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 447 | |
703959d4 | 448 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 449 | |
50526df6 | 450 | end: |
703959d4 | 451 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
45bea155 | 452 | } |
1da177e4 | 453 | |
50526df6 | 454 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 455 | { |
50526df6 | 456 | acpi_status status = AE_OK; |
6ffb221a | 457 | u8 value; |
703959d4 | 458 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 459 | |
703959d4 | 460 | acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
1da177e4 | 461 | |
8e0341ba | 462 | if (acpi_ec_mode == EC_INTR) { |
bec5a1e0 | 463 | if (acpi_ec_check_status(ec, ec->expect_event)) { |
8e0341ba DS |
464 | ec->expect_event = 0; |
465 | wake_up(&ec->wait); | |
466 | } | |
451566f4 DT |
467 | } |
468 | ||
bec5a1e0 | 469 | value = acpi_ec_read_status(ec); |
50526df6 | 470 | if (value & ACPI_EC_FLAG_SCI) { |
6ffb221a | 471 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); |
17e9c78a | 472 | return status == AE_OK ? |
50526df6 LB |
473 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
474 | } | |
703959d4 | 475 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 | 476 | return status == AE_OK ? |
50526df6 | 477 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
478 | } |
479 | ||
480 | /* -------------------------------------------------------------------------- | |
481 | Address Space Management | |
482 | -------------------------------------------------------------------------- */ | |
483 | ||
484 | static acpi_status | |
50526df6 LB |
485 | acpi_ec_space_setup(acpi_handle region_handle, |
486 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
487 | { |
488 | /* | |
489 | * The EC object is in the handler context and is needed | |
490 | * when calling the acpi_ec_space_handler. | |
491 | */ | |
50526df6 LB |
492 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
493 | handler_context : NULL; | |
1da177e4 LT |
494 | |
495 | return AE_OK; | |
496 | } | |
497 | ||
1da177e4 | 498 | static acpi_status |
50526df6 LB |
499 | acpi_ec_space_handler(u32 function, |
500 | acpi_physical_address address, | |
501 | u32 bit_width, | |
502 | acpi_integer * value, | |
503 | void *handler_context, void *region_context) | |
1da177e4 | 504 | { |
50526df6 | 505 | int result = 0; |
703959d4 | 506 | struct acpi_ec *ec = NULL; |
50526df6 LB |
507 | u64 temp = *value; |
508 | acpi_integer f_v = 0; | |
509 | int i = 0; | |
1da177e4 | 510 | |
1da177e4 LT |
511 | |
512 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 513 | return AE_BAD_PARAMETER; |
1da177e4 | 514 | |
fa9cd547 | 515 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 516 | return AE_BAD_PARAMETER; |
1da177e4 LT |
517 | } |
518 | ||
703959d4 | 519 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 520 | |
50526df6 | 521 | next_byte: |
1da177e4 LT |
522 | switch (function) { |
523 | case ACPI_READ: | |
fa9cd547 | 524 | temp = 0; |
6ffb221a | 525 | result = acpi_ec_read(ec, (u8) address, (u8 *) &temp); |
1da177e4 LT |
526 | break; |
527 | case ACPI_WRITE: | |
fa9cd547 | 528 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
529 | break; |
530 | default: | |
531 | result = -EINVAL; | |
532 | goto out; | |
533 | break; | |
534 | } | |
535 | ||
536 | bit_width -= 8; | |
fa9cd547 LY |
537 | if (bit_width) { |
538 | if (function == ACPI_READ) | |
539 | f_v |= temp << 8 * i; | |
540 | if (function == ACPI_WRITE) | |
541 | temp >>= 8; | |
1da177e4 | 542 | i++; |
83ea7445 | 543 | address++; |
1da177e4 LT |
544 | goto next_byte; |
545 | } | |
546 | ||
fa9cd547 LY |
547 | if (function == ACPI_READ) { |
548 | f_v |= temp << 8 * i; | |
1da177e4 LT |
549 | *value = f_v; |
550 | } | |
551 | ||
50526df6 | 552 | out: |
1da177e4 LT |
553 | switch (result) { |
554 | case -EINVAL: | |
d550d98d | 555 | return AE_BAD_PARAMETER; |
1da177e4 LT |
556 | break; |
557 | case -ENODEV: | |
d550d98d | 558 | return AE_NOT_FOUND; |
1da177e4 LT |
559 | break; |
560 | case -ETIME: | |
d550d98d | 561 | return AE_TIME; |
1da177e4 LT |
562 | break; |
563 | default: | |
d550d98d | 564 | return AE_OK; |
1da177e4 | 565 | } |
1da177e4 LT |
566 | } |
567 | ||
1da177e4 LT |
568 | /* -------------------------------------------------------------------------- |
569 | FS Interface (/proc) | |
570 | -------------------------------------------------------------------------- */ | |
571 | ||
50526df6 | 572 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 573 | |
50526df6 | 574 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 575 | { |
703959d4 | 576 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 577 | |
1da177e4 LT |
578 | |
579 | if (!ec) | |
580 | goto end; | |
581 | ||
582 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
703959d4 | 583 | (u32) ec->gpe_bit); |
1da177e4 | 584 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ffb221a DS |
585 | (u32) ec->command_addr, |
586 | (u32) ec->data_addr); | |
1da177e4 | 587 | seq_printf(seq, "use global lock: %s\n", |
703959d4 DS |
588 | ec->global_lock ? "yes" : "no"); |
589 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 590 | |
50526df6 | 591 | end: |
d550d98d | 592 | return 0; |
1da177e4 LT |
593 | } |
594 | ||
595 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
596 | { | |
597 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
598 | } | |
599 | ||
703959d4 | 600 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
601 | .open = acpi_ec_info_open_fs, |
602 | .read = seq_read, | |
603 | .llseek = seq_lseek, | |
604 | .release = single_release, | |
1da177e4 LT |
605 | .owner = THIS_MODULE, |
606 | }; | |
607 | ||
50526df6 | 608 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 609 | { |
50526df6 | 610 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 611 | |
1da177e4 LT |
612 | |
613 | if (!acpi_device_dir(device)) { | |
614 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 615 | acpi_ec_dir); |
1da177e4 | 616 | if (!acpi_device_dir(device)) |
d550d98d | 617 | return -ENODEV; |
1da177e4 LT |
618 | } |
619 | ||
620 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 621 | acpi_device_dir(device)); |
1da177e4 | 622 | if (!entry) |
d550d98d | 623 | return -ENODEV; |
1da177e4 LT |
624 | else { |
625 | entry->proc_fops = &acpi_ec_info_ops; | |
626 | entry->data = acpi_driver_data(device); | |
627 | entry->owner = THIS_MODULE; | |
628 | } | |
629 | ||
d550d98d | 630 | return 0; |
1da177e4 LT |
631 | } |
632 | ||
50526df6 | 633 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 634 | { |
1da177e4 LT |
635 | |
636 | if (acpi_device_dir(device)) { | |
637 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
638 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
639 | acpi_device_dir(device) = NULL; | |
640 | } | |
641 | ||
d550d98d | 642 | return 0; |
1da177e4 LT |
643 | } |
644 | ||
1da177e4 LT |
645 | /* -------------------------------------------------------------------------- |
646 | Driver Interface | |
647 | -------------------------------------------------------------------------- */ | |
648 | ||
703959d4 | 649 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 650 | { |
50526df6 LB |
651 | int result = 0; |
652 | acpi_status status = AE_OK; | |
703959d4 | 653 | struct acpi_ec *ec = NULL; |
45bea155 | 654 | |
45bea155 LY |
655 | |
656 | if (!device) | |
d550d98d | 657 | return -EINVAL; |
45bea155 | 658 | |
703959d4 | 659 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 660 | if (!ec) |
d550d98d | 661 | return -ENOMEM; |
703959d4 DS |
662 | memset(ec, 0, sizeof(struct acpi_ec)); |
663 | ||
664 | ec->handle = device->handle; | |
665 | ec->uid = -1; | |
666 | init_MUTEX(&ec->sem); | |
667 | if (acpi_ec_mode == EC_INTR) { | |
668 | atomic_set(&ec->leaving_burst, 1); | |
669 | init_waitqueue_head(&ec->wait); | |
45bea155 | 670 | } |
1da177e4 LT |
671 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
672 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
673 | acpi_driver_data(device) = ec; | |
674 | ||
675 | /* Use the global lock for all EC transactions? */ | |
703959d4 DS |
676 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, |
677 | &ec->global_lock); | |
1da177e4 | 678 | |
ff2fc3e9 JS |
679 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
680 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
681 | if (ec_ecdt) { | |
1da177e4 | 682 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
683 | ACPI_ADR_SPACE_EC, |
684 | &acpi_ec_space_handler); | |
451566f4 | 685 | |
703959d4 | 686 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 687 | &acpi_ec_gpe_handler); |
1da177e4 LT |
688 | |
689 | kfree(ec_ecdt); | |
690 | } | |
691 | ||
692 | /* Get GPE bit assignment (EC events). */ | |
693 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 | 694 | status = |
703959d4 DS |
695 | acpi_evaluate_integer(ec->handle, "_GPE", NULL, |
696 | &ec->gpe_bit); | |
1da177e4 | 697 | if (ACPI_FAILURE(status)) { |
703959d4 | 698 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); |
1da177e4 LT |
699 | result = -ENODEV; |
700 | goto end; | |
701 | } | |
702 | ||
703 | result = acpi_ec_add_fs(device); | |
704 | if (result) | |
705 | goto end; | |
706 | ||
703959d4 | 707 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
50526df6 | 708 | acpi_device_name(device), acpi_device_bid(device), |
703959d4 | 709 | (u32) ec->gpe_bit)); |
1da177e4 LT |
710 | |
711 | if (!first_ec) | |
712 | first_ec = device; | |
713 | ||
703959d4 | 714 | end: |
1da177e4 LT |
715 | if (result) |
716 | kfree(ec); | |
717 | ||
d550d98d | 718 | return result; |
1da177e4 LT |
719 | } |
720 | ||
50526df6 | 721 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 722 | { |
703959d4 | 723 | struct acpi_ec *ec = NULL; |
1da177e4 | 724 | |
1da177e4 LT |
725 | |
726 | if (!device) | |
d550d98d | 727 | return -EINVAL; |
1da177e4 LT |
728 | |
729 | ec = acpi_driver_data(device); | |
730 | ||
731 | acpi_ec_remove_fs(device); | |
732 | ||
733 | kfree(ec); | |
734 | ||
d550d98d | 735 | return 0; |
1da177e4 LT |
736 | } |
737 | ||
1da177e4 | 738 | static acpi_status |
50526df6 | 739 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 740 | { |
703959d4 | 741 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 742 | |
50eca3eb | 743 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
744 | return AE_OK; |
745 | } | |
746 | ||
747 | /* | |
748 | * The first address region returned is the data port, and | |
749 | * the second address region returned is the status/command | |
750 | * port. | |
751 | */ | |
6ffb221a DS |
752 | if (ec->data_addr == 0) { |
753 | ec->data_addr = resource->data.io.minimum; | |
754 | } else if (ec->command_addr == 0) { | |
755 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
756 | } else { |
757 | return AE_CTRL_TERMINATE; | |
758 | } | |
759 | ||
1da177e4 LT |
760 | return AE_OK; |
761 | } | |
762 | ||
50526df6 | 763 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 764 | { |
50526df6 | 765 | acpi_status status = AE_OK; |
703959d4 | 766 | struct acpi_ec *ec = NULL; |
1da177e4 | 767 | |
1da177e4 LT |
768 | |
769 | if (!device) | |
d550d98d | 770 | return -EINVAL; |
1da177e4 LT |
771 | |
772 | ec = acpi_driver_data(device); | |
773 | ||
774 | if (!ec) | |
d550d98d | 775 | return -EINVAL; |
1da177e4 LT |
776 | |
777 | /* | |
778 | * Get I/O port addresses. Convert to GAS format. | |
779 | */ | |
703959d4 | 780 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 781 | acpi_ec_io_ports, ec); |
6ffb221a | 782 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
783 | ACPI_EXCEPTION((AE_INFO, status, |
784 | "Error getting I/O port addresses")); | |
d550d98d | 785 | return -ENODEV; |
1da177e4 LT |
786 | } |
787 | ||
6ffb221a DS |
788 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
789 | ec->gpe_bit, ec->command_addr, ec->data_addr)); | |
1da177e4 LT |
790 | |
791 | /* | |
792 | * Install GPE handler | |
793 | */ | |
703959d4 | 794 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, |
50526df6 LB |
795 | ACPI_GPE_EDGE_TRIGGERED, |
796 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 797 | if (ACPI_FAILURE(status)) { |
d550d98d | 798 | return -ENODEV; |
1da177e4 | 799 | } |
703959d4 DS |
800 | acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
801 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 802 | |
703959d4 | 803 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
804 | ACPI_ADR_SPACE_EC, |
805 | &acpi_ec_space_handler, | |
806 | &acpi_ec_space_setup, ec); | |
1da177e4 | 807 | if (ACPI_FAILURE(status)) { |
703959d4 | 808 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 809 | &acpi_ec_gpe_handler); |
d550d98d | 810 | return -ENODEV; |
1da177e4 LT |
811 | } |
812 | ||
d550d98d | 813 | return AE_OK; |
1da177e4 LT |
814 | } |
815 | ||
50526df6 | 816 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 817 | { |
50526df6 | 818 | acpi_status status = AE_OK; |
703959d4 | 819 | struct acpi_ec *ec = NULL; |
1da177e4 | 820 | |
1da177e4 LT |
821 | |
822 | if (!device) | |
d550d98d | 823 | return -EINVAL; |
1da177e4 LT |
824 | |
825 | ec = acpi_driver_data(device); | |
826 | ||
703959d4 | 827 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
828 | ACPI_ADR_SPACE_EC, |
829 | &acpi_ec_space_handler); | |
1da177e4 | 830 | if (ACPI_FAILURE(status)) |
d550d98d | 831 | return -ENODEV; |
1da177e4 | 832 | |
50526df6 | 833 | status = |
703959d4 | 834 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 835 | &acpi_ec_gpe_handler); |
1da177e4 | 836 | if (ACPI_FAILURE(status)) |
d550d98d | 837 | return -ENODEV; |
1da177e4 | 838 | |
d550d98d | 839 | return 0; |
1da177e4 LT |
840 | } |
841 | ||
842 | static acpi_status __init | |
50526df6 LB |
843 | acpi_fake_ecdt_callback(acpi_handle handle, |
844 | u32 Level, void *context, void **retval) | |
1da177e4 | 845 | { |
50526df6 | 846 | acpi_status status; |
1da177e4 | 847 | |
703959d4 DS |
848 | init_MUTEX(&ec_ecdt->sem); |
849 | if (acpi_ec_mode == EC_INTR) { | |
850 | init_waitqueue_head(&ec_ecdt->wait); | |
851 | } | |
1da177e4 | 852 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 853 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
854 | if (ACPI_FAILURE(status)) |
855 | return status; | |
1da177e4 | 856 | |
703959d4 DS |
857 | ec_ecdt->uid = -1; |
858 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 859 | |
50526df6 LB |
860 | status = |
861 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
703959d4 | 862 | &ec_ecdt->gpe_bit); |
1da177e4 LT |
863 | if (ACPI_FAILURE(status)) |
864 | return status; | |
703959d4 DS |
865 | ec_ecdt->global_lock = TRUE; |
866 | ec_ecdt->handle = handle; | |
1da177e4 | 867 | |
6ffb221a DS |
868 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
869 | ec_ecdt->gpe_bit, ec_ecdt->command_addr, ec_ecdt->data_addr)); | |
1da177e4 LT |
870 | |
871 | return AE_CTRL_TERMINATE; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
876 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
877 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
878 | * required, but if EC regison is accessed early, it is required. | |
879 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
880 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
881 | * op region (since _REG isn't invoked yet). The assumption is true for | |
882 | * all systems found. | |
883 | */ | |
50526df6 | 884 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 885 | { |
50526df6 LB |
886 | acpi_status status; |
887 | int ret = 0; | |
1da177e4 | 888 | |
703959d4 | 889 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 890 | |
703959d4 | 891 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
892 | if (!ec_ecdt) { |
893 | ret = -ENOMEM; | |
894 | goto error; | |
895 | } | |
703959d4 | 896 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
1da177e4 | 897 | |
50526df6 LB |
898 | status = acpi_get_devices(ACPI_EC_HID, |
899 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
900 | if (ACPI_FAILURE(status)) { |
901 | kfree(ec_ecdt); | |
902 | ec_ecdt = NULL; | |
903 | ret = -ENODEV; | |
703959d4 | 904 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
905 | goto error; |
906 | } | |
907 | return 0; | |
703959d4 | 908 | error: |
1da177e4 LT |
909 | return ret; |
910 | } | |
911 | ||
50526df6 | 912 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 913 | { |
50526df6 LB |
914 | acpi_status status; |
915 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 916 | |
50526df6 LB |
917 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
918 | (struct acpi_table_header **) | |
919 | &ecdt_ptr); | |
45bea155 LY |
920 | if (ACPI_FAILURE(status)) |
921 | return -ENODEV; | |
922 | ||
703959d4 | 923 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
924 | |
925 | /* | |
926 | * Generate a temporary ec context to use until the namespace is scanned | |
927 | */ | |
703959d4 | 928 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
929 | if (!ec_ecdt) |
930 | return -ENOMEM; | |
703959d4 | 931 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
45bea155 | 932 | |
703959d4 DS |
933 | init_MUTEX(&ec_ecdt->sem); |
934 | if (acpi_ec_mode == EC_INTR) { | |
935 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 936 | } |
6ffb221a DS |
937 | ec_ecdt->command_addr = ecdt_ptr->ec_control.address; |
938 | ec_ecdt->data_addr = ecdt_ptr->ec_data.address; | |
703959d4 | 939 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; |
1da177e4 | 940 | /* use the GL just to be safe */ |
703959d4 DS |
941 | ec_ecdt->global_lock = TRUE; |
942 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 943 | |
50526df6 | 944 | status = |
703959d4 | 945 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
1da177e4 LT |
946 | if (ACPI_FAILURE(status)) { |
947 | goto error; | |
948 | } | |
949 | ||
950 | return 0; | |
703959d4 DS |
951 | error: |
952 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); | |
1da177e4 LT |
953 | kfree(ec_ecdt); |
954 | ec_ecdt = NULL; | |
955 | ||
956 | return -ENODEV; | |
957 | } | |
958 | ||
959 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 960 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 961 | { |
50526df6 LB |
962 | acpi_status status; |
963 | int ret; | |
1da177e4 LT |
964 | |
965 | ret = acpi_ec_get_real_ecdt(); | |
966 | /* Try to make a fake ECDT */ | |
967 | if (ret && acpi_fake_ecdt_enabled) { | |
968 | ret = acpi_ec_fake_ecdt(); | |
969 | } | |
970 | ||
971 | if (ret) | |
972 | return 0; | |
973 | ||
974 | /* | |
975 | * Install GPE handler | |
976 | */ | |
703959d4 | 977 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 LB |
978 | ACPI_GPE_EDGE_TRIGGERED, |
979 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
980 | if (ACPI_FAILURE(status)) { |
981 | goto error; | |
982 | } | |
703959d4 DS |
983 | acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
984 | acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
50526df6 LB |
985 | |
986 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
987 | ACPI_ADR_SPACE_EC, | |
988 | &acpi_ec_space_handler, | |
989 | &acpi_ec_space_setup, | |
990 | ec_ecdt); | |
1da177e4 | 991 | if (ACPI_FAILURE(status)) { |
703959d4 | 992 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 993 | &acpi_ec_gpe_handler); |
1da177e4 LT |
994 | goto error; |
995 | } | |
996 | ||
997 | return 0; | |
998 | ||
50526df6 | 999 | error: |
703959d4 | 1000 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
1001 | kfree(ec_ecdt); |
1002 | ec_ecdt = NULL; | |
1003 | ||
1004 | return -ENODEV; | |
1005 | } | |
1006 | ||
50526df6 | 1007 | static int __init acpi_ec_init(void) |
1da177e4 | 1008 | { |
50526df6 | 1009 | int result = 0; |
1da177e4 | 1010 | |
1da177e4 LT |
1011 | |
1012 | if (acpi_disabled) | |
d550d98d | 1013 | return 0; |
1da177e4 LT |
1014 | |
1015 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1016 | if (!acpi_ec_dir) | |
d550d98d | 1017 | return -ENODEV; |
1da177e4 LT |
1018 | |
1019 | /* Now register the driver for the EC */ | |
1020 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1021 | if (result < 0) { | |
1022 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1023 | return -ENODEV; |
1da177e4 LT |
1024 | } |
1025 | ||
d550d98d | 1026 | return result; |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | subsys_initcall(acpi_ec_init); | |
1030 | ||
1031 | /* EC driver currently not unloadable */ | |
1032 | #if 0 | |
50526df6 | 1033 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1034 | { |
1da177e4 LT |
1035 | |
1036 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1037 | ||
1038 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1039 | ||
d550d98d | 1040 | return; |
1da177e4 | 1041 | } |
50526df6 | 1042 | #endif /* 0 */ |
1da177e4 LT |
1043 | |
1044 | static int __init acpi_fake_ecdt_setup(char *str) | |
1045 | { | |
1046 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1047 | return 1; |
1da177e4 | 1048 | } |
7b15f5e7 | 1049 | |
1da177e4 | 1050 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1051 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1052 | { |
02b28a33 | 1053 | int intr; |
7b15f5e7 | 1054 | |
02b28a33 | 1055 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1056 | return 0; |
1057 | ||
02b28a33 | 1058 | if (intr) { |
703959d4 | 1059 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1060 | } else { |
703959d4 | 1061 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1062 | } |
703959d4 DS |
1063 | acpi_ec_driver.ops.add = acpi_ec_add; |
1064 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); | |
1065 | ||
9b41046c | 1066 | return 1; |
45bea155 | 1067 | } |
50526df6 | 1068 | |
53f11d4f | 1069 | __setup("ec_intr=", acpi_ec_set_intr_mode); |