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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 | ||
68 | #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ | |
69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ | |
70 | #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ | |
71 | #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */ | |
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 | |
6ffb221a DS |
137 | static int acpi_ec_check_status(u8 status, u8 event) |
138 | { | |
45bea155 | 139 | switch (event) { |
703959d4 DS |
140 | case ACPI_EC_EVENT_OBF_1: |
141 | if (status & ACPI_EC_FLAG_OBF) | |
142 | return 1; | |
45bea155 | 143 | break; |
703959d4 DS |
144 | case ACPI_EC_EVENT_IBF_0: |
145 | if (!(status & ACPI_EC_FLAG_IBF)) | |
146 | return 1; | |
45bea155 LY |
147 | break; |
148 | default: | |
703959d4 | 149 | break; |
45bea155 LY |
150 | } |
151 | ||
703959d4 | 152 | return 0; |
45bea155 | 153 | } |
451566f4 | 154 | |
703959d4 | 155 | static int acpi_ec_wait(struct acpi_ec *ec, u8 event) |
7c6db5e5 | 156 | { |
703959d4 DS |
157 | int i = (acpi_ec_mode == EC_POLL) ? ACPI_EC_UDELAY_COUNT : 0; |
158 | long time_left; | |
451566f4 | 159 | |
703959d4 | 160 | ec->expect_event = event; |
7c6db5e5 | 161 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { |
703959d4 DS |
162 | ec->expect_event = 0; |
163 | return 0; | |
716e084e LY |
164 | } |
165 | ||
703959d4 DS |
166 | do { |
167 | if (acpi_ec_mode == EC_POLL) { | |
168 | udelay(ACPI_EC_UDELAY); | |
169 | } else { | |
170 | time_left = wait_event_timeout(ec->wait, | |
171 | !ec->expect_event, | |
172 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
173 | if (time_left > 0) { | |
174 | ec->expect_event = 0; | |
7c6db5e5 | 175 | return 0; |
703959d4 | 176 | } |
7c6db5e5 | 177 | } |
703959d4 DS |
178 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { |
179 | ec->expect_event = 0; | |
180 | return 0; | |
181 | } | |
182 | } while (--i > 0); | |
183 | ||
184 | ec->expect_event = 0; | |
1da177e4 | 185 | |
d550d98d | 186 | return -ETIME; |
1da177e4 LT |
187 | } |
188 | ||
02b28a33 | 189 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
190 | /* |
191 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
192 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
193 | */ | |
703959d4 | 194 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 195 | { |
6ffb221a DS |
196 | u8 tmp = 0; |
197 | u8 status = 0; | |
451566f4 | 198 | |
451566f4 DT |
199 | |
200 | status = acpi_ec_read_status(ec); | |
50526df6 | 201 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 202 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 203 | if (status) |
716e084e | 204 | goto end; |
703959d4 DS |
205 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
206 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
207 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 208 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 209 | return -EINVAL; |
451566f4 | 210 | } |
668d74c0 LY |
211 | } |
212 | ||
703959d4 | 213 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 214 | return 0; |
703959d4 DS |
215 | end: |
216 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); | |
d550d98d | 217 | return -1; |
451566f4 DT |
218 | } |
219 | ||
703959d4 | 220 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 221 | { |
6ffb221a | 222 | u8 status = 0; |
451566f4 | 223 | |
451566f4 | 224 | |
06a2a385 LY |
225 | status = acpi_ec_read_status(ec); |
226 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
703959d4 | 227 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
06a2a385 LY |
228 | if(status) |
229 | goto end; | |
703959d4 DS |
230 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
231 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 232 | } |
703959d4 | 233 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 234 | return 0; |
703959d4 DS |
235 | end: |
236 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); | |
d550d98d | 237 | return -1; |
451566f4 | 238 | } |
02b28a33 | 239 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 240 | |
703959d4 | 241 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
3576cf61 DS |
242 | const u8 *wdata, unsigned wdata_len, |
243 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 244 | { |
d7a76e4c | 245 | int result; |
45bea155 | 246 | |
703959d4 | 247 | acpi_ec_write_cmd(ec, command); |
45bea155 | 248 | |
7c6db5e5 | 249 | for (; wdata_len > 0; wdata_len --) { |
703959d4 | 250 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
251 | if (result) |
252 | return result; | |
703959d4 | 253 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 254 | } |
45bea155 | 255 | |
d91df1aa | 256 | if (!rdata_len) { |
703959d4 | 257 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
258 | if (result) |
259 | return result; | |
260 | } | |
45bea155 | 261 | |
7c6db5e5 | 262 | for (; rdata_len > 0; rdata_len --) { |
703959d4 | 263 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
7c6db5e5 DS |
264 | if (result) |
265 | return result; | |
50526df6 | 266 | |
6ffb221a | 267 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 268 | } |
45bea155 | 269 | |
7c6db5e5 | 270 | return 0; |
45bea155 LY |
271 | } |
272 | ||
3576cf61 DS |
273 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
274 | const u8 *wdata, unsigned wdata_len, | |
275 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 276 | { |
d7a76e4c | 277 | int status; |
50526df6 | 278 | u32 glk; |
1da177e4 | 279 | |
d7a76e4c | 280 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 281 | return -EINVAL; |
1da177e4 | 282 | |
d7a76e4c LP |
283 | if (rdata) |
284 | memset(rdata, 0, rdata_len); | |
1da177e4 | 285 | |
703959d4 | 286 | if (ec->global_lock) { |
1da177e4 LT |
287 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
288 | if (ACPI_FAILURE(status)) | |
d550d98d | 289 | return -ENODEV; |
1da177e4 | 290 | } |
703959d4 | 291 | down(&ec->sem); |
451566f4 | 292 | |
5d57a6a5 AS |
293 | /* Make sure GPE is enabled before doing transaction */ |
294 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
295 | ||
703959d4 | 296 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 297 | if (status) { |
3576cf61 | 298 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 299 | goto end; |
716e084e | 300 | } |
1da177e4 | 301 | |
d7a76e4c LP |
302 | status = acpi_ec_transaction_unlocked(ec, command, |
303 | wdata, wdata_len, | |
304 | rdata, rdata_len); | |
1da177e4 | 305 | |
d7a76e4c | 306 | end: |
703959d4 | 307 | up(&ec->sem); |
1da177e4 | 308 | |
703959d4 | 309 | if (ec->global_lock) |
1da177e4 LT |
310 | acpi_release_global_lock(glk); |
311 | ||
d550d98d | 312 | return status; |
1da177e4 LT |
313 | } |
314 | ||
6ffb221a | 315 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
316 | { |
317 | int result; | |
318 | u8 d; | |
319 | ||
320 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
321 | &address, 1, &d, 1); | |
322 | *data = d; | |
323 | return result; | |
324 | } | |
6ffb221a | 325 | |
3576cf61 DS |
326 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
327 | { | |
328 | u8 wdata[2] = { address, data }; | |
329 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
330 | wdata, 2, NULL, 0); | |
331 | } | |
332 | ||
1da177e4 LT |
333 | /* |
334 | * Externally callable EC access functions. For now, assume 1 EC only | |
335 | */ | |
6ffb221a | 336 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 337 | { |
703959d4 | 338 | struct acpi_ec *ec; |
1da177e4 | 339 | int err; |
6ffb221a | 340 | u8 temp_data; |
1da177e4 LT |
341 | |
342 | if (!first_ec) | |
343 | return -ENODEV; | |
344 | ||
345 | ec = acpi_driver_data(first_ec); | |
346 | ||
347 | err = acpi_ec_read(ec, addr, &temp_data); | |
348 | ||
349 | if (!err) { | |
350 | *val = temp_data; | |
351 | return 0; | |
50526df6 | 352 | } else |
1da177e4 LT |
353 | return err; |
354 | } | |
50526df6 | 355 | |
1da177e4 LT |
356 | EXPORT_SYMBOL(ec_read); |
357 | ||
50526df6 | 358 | int ec_write(u8 addr, u8 val) |
1da177e4 | 359 | { |
703959d4 | 360 | struct acpi_ec *ec; |
1da177e4 LT |
361 | int err; |
362 | ||
363 | if (!first_ec) | |
364 | return -ENODEV; | |
365 | ||
366 | ec = acpi_driver_data(first_ec); | |
367 | ||
368 | err = acpi_ec_write(ec, addr, val); | |
369 | ||
370 | return err; | |
371 | } | |
50526df6 | 372 | |
1da177e4 LT |
373 | EXPORT_SYMBOL(ec_write); |
374 | ||
d7a76e4c LP |
375 | extern int ec_transaction(u8 command, |
376 | const u8 *wdata, unsigned wdata_len, | |
377 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 378 | { |
703959d4 | 379 | struct acpi_ec *ec; |
45bea155 | 380 | |
d7a76e4c LP |
381 | if (!first_ec) |
382 | return -ENODEV; | |
45bea155 | 383 | |
d7a76e4c | 384 | ec = acpi_driver_data(first_ec); |
45bea155 | 385 | |
3576cf61 DS |
386 | return acpi_ec_transaction(ec, command, wdata, |
387 | wdata_len, rdata, rdata_len); | |
45bea155 | 388 | } |
1da177e4 | 389 | |
ab9e43c6 LP |
390 | EXPORT_SYMBOL(ec_transaction); |
391 | ||
6ffb221a | 392 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
3576cf61 DS |
393 | { |
394 | int result; | |
d7a76e4c | 395 | u8 d; |
1da177e4 | 396 | |
d7a76e4c LP |
397 | if (!ec || !data) |
398 | return -EINVAL; | |
1da177e4 | 399 | |
d7a76e4c LP |
400 | /* |
401 | * Query the EC to find out which _Qxx method we need to evaluate. | |
402 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
403 | * bit to be cleared (and thus clearing the interrupt source). | |
404 | */ | |
716e084e | 405 | |
d7a76e4c LP |
406 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
407 | if (result) | |
408 | return result; | |
1da177e4 | 409 | |
d7a76e4c LP |
410 | if (!d) |
411 | return -ENODATA; | |
1da177e4 | 412 | |
d7a76e4c LP |
413 | *data = d; |
414 | return 0; | |
1da177e4 LT |
415 | } |
416 | ||
1da177e4 LT |
417 | /* -------------------------------------------------------------------------- |
418 | Event Management | |
419 | -------------------------------------------------------------------------- */ | |
420 | ||
8e0341ba | 421 | struct acpi_ec_query_data { |
50526df6 LB |
422 | acpi_handle handle; |
423 | u8 data; | |
1da177e4 LT |
424 | }; |
425 | ||
50526df6 | 426 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 427 | { |
703959d4 | 428 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
6ffb221a DS |
429 | u8 value = 0; |
430 | static char object_name[8]; | |
45bea155 | 431 | |
6ffb221a | 432 | if (!ec) |
45bea155 LY |
433 | goto end; |
434 | ||
703959d4 | 435 | value = acpi_ec_read_status(ec); |
45bea155 | 436 | |
45bea155 LY |
437 | if (!(value & ACPI_EC_FLAG_SCI)) |
438 | goto end; | |
439 | ||
440 | if (acpi_ec_query(ec, &value)) | |
441 | goto end; | |
442 | ||
6ffb221a | 443 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 444 | |
8e0341ba | 445 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 446 | |
703959d4 | 447 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 448 | |
50526df6 | 449 | end: |
703959d4 | 450 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
45bea155 | 451 | } |
1da177e4 | 452 | |
50526df6 | 453 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 454 | { |
50526df6 | 455 | acpi_status status = AE_OK; |
6ffb221a | 456 | u8 value; |
703959d4 | 457 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 458 | |
703959d4 | 459 | acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 | 460 | value = acpi_ec_read_status(ec); |
1da177e4 | 461 | |
8e0341ba DS |
462 | if (acpi_ec_mode == EC_INTR) { |
463 | if (acpi_ec_check_status(value, ec->expect_event)) { | |
464 | ec->expect_event = 0; | |
465 | wake_up(&ec->wait); | |
466 | } | |
451566f4 DT |
467 | } |
468 | ||
50526df6 | 469 | if (value & ACPI_EC_FLAG_SCI) { |
6ffb221a | 470 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); |
17e9c78a | 471 | return status == AE_OK ? |
50526df6 LB |
472 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
473 | } | |
703959d4 | 474 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 | 475 | return status == AE_OK ? |
50526df6 | 476 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
477 | } |
478 | ||
479 | /* -------------------------------------------------------------------------- | |
480 | Address Space Management | |
481 | -------------------------------------------------------------------------- */ | |
482 | ||
483 | static acpi_status | |
50526df6 LB |
484 | acpi_ec_space_setup(acpi_handle region_handle, |
485 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
486 | { |
487 | /* | |
488 | * The EC object is in the handler context and is needed | |
489 | * when calling the acpi_ec_space_handler. | |
490 | */ | |
50526df6 LB |
491 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
492 | handler_context : NULL; | |
1da177e4 LT |
493 | |
494 | return AE_OK; | |
495 | } | |
496 | ||
1da177e4 | 497 | static acpi_status |
50526df6 LB |
498 | acpi_ec_space_handler(u32 function, |
499 | acpi_physical_address address, | |
500 | u32 bit_width, | |
501 | acpi_integer * value, | |
502 | void *handler_context, void *region_context) | |
1da177e4 | 503 | { |
50526df6 | 504 | int result = 0; |
703959d4 | 505 | struct acpi_ec *ec = NULL; |
50526df6 LB |
506 | u64 temp = *value; |
507 | acpi_integer f_v = 0; | |
508 | int i = 0; | |
1da177e4 | 509 | |
1da177e4 LT |
510 | |
511 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 512 | return AE_BAD_PARAMETER; |
1da177e4 | 513 | |
fa9cd547 | 514 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 515 | return AE_BAD_PARAMETER; |
1da177e4 LT |
516 | } |
517 | ||
703959d4 | 518 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 519 | |
50526df6 | 520 | next_byte: |
1da177e4 LT |
521 | switch (function) { |
522 | case ACPI_READ: | |
fa9cd547 | 523 | temp = 0; |
6ffb221a | 524 | result = acpi_ec_read(ec, (u8) address, (u8 *) &temp); |
1da177e4 LT |
525 | break; |
526 | case ACPI_WRITE: | |
fa9cd547 | 527 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
528 | break; |
529 | default: | |
530 | result = -EINVAL; | |
531 | goto out; | |
532 | break; | |
533 | } | |
534 | ||
535 | bit_width -= 8; | |
fa9cd547 LY |
536 | if (bit_width) { |
537 | if (function == ACPI_READ) | |
538 | f_v |= temp << 8 * i; | |
539 | if (function == ACPI_WRITE) | |
540 | temp >>= 8; | |
1da177e4 | 541 | i++; |
83ea7445 | 542 | address++; |
1da177e4 LT |
543 | goto next_byte; |
544 | } | |
545 | ||
fa9cd547 LY |
546 | if (function == ACPI_READ) { |
547 | f_v |= temp << 8 * i; | |
1da177e4 LT |
548 | *value = f_v; |
549 | } | |
550 | ||
50526df6 | 551 | out: |
1da177e4 LT |
552 | switch (result) { |
553 | case -EINVAL: | |
d550d98d | 554 | return AE_BAD_PARAMETER; |
1da177e4 LT |
555 | break; |
556 | case -ENODEV: | |
d550d98d | 557 | return AE_NOT_FOUND; |
1da177e4 LT |
558 | break; |
559 | case -ETIME: | |
d550d98d | 560 | return AE_TIME; |
1da177e4 LT |
561 | break; |
562 | default: | |
d550d98d | 563 | return AE_OK; |
1da177e4 | 564 | } |
1da177e4 LT |
565 | } |
566 | ||
1da177e4 LT |
567 | /* -------------------------------------------------------------------------- |
568 | FS Interface (/proc) | |
569 | -------------------------------------------------------------------------- */ | |
570 | ||
50526df6 | 571 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 572 | |
50526df6 | 573 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 574 | { |
703959d4 | 575 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 576 | |
1da177e4 LT |
577 | |
578 | if (!ec) | |
579 | goto end; | |
580 | ||
581 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
703959d4 | 582 | (u32) ec->gpe_bit); |
1da177e4 | 583 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ffb221a DS |
584 | (u32) ec->command_addr, |
585 | (u32) ec->data_addr); | |
1da177e4 | 586 | seq_printf(seq, "use global lock: %s\n", |
703959d4 DS |
587 | ec->global_lock ? "yes" : "no"); |
588 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 589 | |
50526df6 | 590 | end: |
d550d98d | 591 | return 0; |
1da177e4 LT |
592 | } |
593 | ||
594 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
595 | { | |
596 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
597 | } | |
598 | ||
703959d4 | 599 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
600 | .open = acpi_ec_info_open_fs, |
601 | .read = seq_read, | |
602 | .llseek = seq_lseek, | |
603 | .release = single_release, | |
1da177e4 LT |
604 | .owner = THIS_MODULE, |
605 | }; | |
606 | ||
50526df6 | 607 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 608 | { |
50526df6 | 609 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 610 | |
1da177e4 LT |
611 | |
612 | if (!acpi_device_dir(device)) { | |
613 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 614 | acpi_ec_dir); |
1da177e4 | 615 | if (!acpi_device_dir(device)) |
d550d98d | 616 | return -ENODEV; |
1da177e4 LT |
617 | } |
618 | ||
619 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 620 | acpi_device_dir(device)); |
1da177e4 | 621 | if (!entry) |
d550d98d | 622 | return -ENODEV; |
1da177e4 LT |
623 | else { |
624 | entry->proc_fops = &acpi_ec_info_ops; | |
625 | entry->data = acpi_driver_data(device); | |
626 | entry->owner = THIS_MODULE; | |
627 | } | |
628 | ||
d550d98d | 629 | return 0; |
1da177e4 LT |
630 | } |
631 | ||
50526df6 | 632 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 633 | { |
1da177e4 LT |
634 | |
635 | if (acpi_device_dir(device)) { | |
636 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
637 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
638 | acpi_device_dir(device) = NULL; | |
639 | } | |
640 | ||
d550d98d | 641 | return 0; |
1da177e4 LT |
642 | } |
643 | ||
1da177e4 LT |
644 | /* -------------------------------------------------------------------------- |
645 | Driver Interface | |
646 | -------------------------------------------------------------------------- */ | |
647 | ||
703959d4 | 648 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 649 | { |
50526df6 LB |
650 | int result = 0; |
651 | acpi_status status = AE_OK; | |
703959d4 | 652 | struct acpi_ec *ec = NULL; |
45bea155 | 653 | |
45bea155 LY |
654 | |
655 | if (!device) | |
d550d98d | 656 | return -EINVAL; |
45bea155 | 657 | |
703959d4 | 658 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 659 | if (!ec) |
d550d98d | 660 | return -ENOMEM; |
703959d4 DS |
661 | memset(ec, 0, sizeof(struct acpi_ec)); |
662 | ||
663 | ec->handle = device->handle; | |
664 | ec->uid = -1; | |
665 | init_MUTEX(&ec->sem); | |
666 | if (acpi_ec_mode == EC_INTR) { | |
667 | atomic_set(&ec->leaving_burst, 1); | |
668 | init_waitqueue_head(&ec->wait); | |
45bea155 | 669 | } |
1da177e4 LT |
670 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
671 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
672 | acpi_driver_data(device) = ec; | |
673 | ||
674 | /* Use the global lock for all EC transactions? */ | |
703959d4 DS |
675 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, |
676 | &ec->global_lock); | |
1da177e4 | 677 | |
ff2fc3e9 JS |
678 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
679 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
680 | if (ec_ecdt) { | |
1da177e4 | 681 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
682 | ACPI_ADR_SPACE_EC, |
683 | &acpi_ec_space_handler); | |
451566f4 | 684 | |
703959d4 | 685 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 686 | &acpi_ec_gpe_handler); |
1da177e4 LT |
687 | |
688 | kfree(ec_ecdt); | |
689 | } | |
690 | ||
691 | /* Get GPE bit assignment (EC events). */ | |
692 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 | 693 | status = |
703959d4 DS |
694 | acpi_evaluate_integer(ec->handle, "_GPE", NULL, |
695 | &ec->gpe_bit); | |
1da177e4 | 696 | if (ACPI_FAILURE(status)) { |
703959d4 | 697 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); |
1da177e4 LT |
698 | result = -ENODEV; |
699 | goto end; | |
700 | } | |
701 | ||
702 | result = acpi_ec_add_fs(device); | |
703 | if (result) | |
704 | goto end; | |
705 | ||
703959d4 | 706 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
50526df6 | 707 | acpi_device_name(device), acpi_device_bid(device), |
703959d4 | 708 | (u32) ec->gpe_bit)); |
1da177e4 LT |
709 | |
710 | if (!first_ec) | |
711 | first_ec = device; | |
712 | ||
703959d4 | 713 | end: |
1da177e4 LT |
714 | if (result) |
715 | kfree(ec); | |
716 | ||
d550d98d | 717 | return result; |
1da177e4 LT |
718 | } |
719 | ||
50526df6 | 720 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 721 | { |
703959d4 | 722 | struct acpi_ec *ec = NULL; |
1da177e4 | 723 | |
1da177e4 LT |
724 | |
725 | if (!device) | |
d550d98d | 726 | return -EINVAL; |
1da177e4 LT |
727 | |
728 | ec = acpi_driver_data(device); | |
729 | ||
730 | acpi_ec_remove_fs(device); | |
731 | ||
732 | kfree(ec); | |
733 | ||
d550d98d | 734 | return 0; |
1da177e4 LT |
735 | } |
736 | ||
1da177e4 | 737 | static acpi_status |
50526df6 | 738 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 739 | { |
703959d4 | 740 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 741 | |
50eca3eb | 742 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
743 | return AE_OK; |
744 | } | |
745 | ||
746 | /* | |
747 | * The first address region returned is the data port, and | |
748 | * the second address region returned is the status/command | |
749 | * port. | |
750 | */ | |
6ffb221a DS |
751 | if (ec->data_addr == 0) { |
752 | ec->data_addr = resource->data.io.minimum; | |
753 | } else if (ec->command_addr == 0) { | |
754 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
755 | } else { |
756 | return AE_CTRL_TERMINATE; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | return AE_OK; |
760 | } | |
761 | ||
50526df6 | 762 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 763 | { |
50526df6 | 764 | acpi_status status = AE_OK; |
703959d4 | 765 | struct acpi_ec *ec = NULL; |
1da177e4 | 766 | |
1da177e4 LT |
767 | |
768 | if (!device) | |
d550d98d | 769 | return -EINVAL; |
1da177e4 LT |
770 | |
771 | ec = acpi_driver_data(device); | |
772 | ||
773 | if (!ec) | |
d550d98d | 774 | return -EINVAL; |
1da177e4 LT |
775 | |
776 | /* | |
777 | * Get I/O port addresses. Convert to GAS format. | |
778 | */ | |
703959d4 | 779 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 780 | acpi_ec_io_ports, ec); |
6ffb221a | 781 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
782 | ACPI_EXCEPTION((AE_INFO, status, |
783 | "Error getting I/O port addresses")); | |
d550d98d | 784 | return -ENODEV; |
1da177e4 LT |
785 | } |
786 | ||
6ffb221a DS |
787 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
788 | ec->gpe_bit, ec->command_addr, ec->data_addr)); | |
1da177e4 LT |
789 | |
790 | /* | |
791 | * Install GPE handler | |
792 | */ | |
703959d4 | 793 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, |
50526df6 LB |
794 | ACPI_GPE_EDGE_TRIGGERED, |
795 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 796 | if (ACPI_FAILURE(status)) { |
d550d98d | 797 | return -ENODEV; |
1da177e4 | 798 | } |
703959d4 DS |
799 | acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
800 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 801 | |
703959d4 | 802 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
803 | ACPI_ADR_SPACE_EC, |
804 | &acpi_ec_space_handler, | |
805 | &acpi_ec_space_setup, ec); | |
1da177e4 | 806 | if (ACPI_FAILURE(status)) { |
703959d4 | 807 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 808 | &acpi_ec_gpe_handler); |
d550d98d | 809 | return -ENODEV; |
1da177e4 LT |
810 | } |
811 | ||
d550d98d | 812 | return AE_OK; |
1da177e4 LT |
813 | } |
814 | ||
50526df6 | 815 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 816 | { |
50526df6 | 817 | acpi_status status = AE_OK; |
703959d4 | 818 | struct acpi_ec *ec = NULL; |
1da177e4 | 819 | |
1da177e4 LT |
820 | |
821 | if (!device) | |
d550d98d | 822 | return -EINVAL; |
1da177e4 LT |
823 | |
824 | ec = acpi_driver_data(device); | |
825 | ||
703959d4 | 826 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
827 | ACPI_ADR_SPACE_EC, |
828 | &acpi_ec_space_handler); | |
1da177e4 | 829 | if (ACPI_FAILURE(status)) |
d550d98d | 830 | return -ENODEV; |
1da177e4 | 831 | |
50526df6 | 832 | status = |
703959d4 | 833 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 834 | &acpi_ec_gpe_handler); |
1da177e4 | 835 | if (ACPI_FAILURE(status)) |
d550d98d | 836 | return -ENODEV; |
1da177e4 | 837 | |
d550d98d | 838 | return 0; |
1da177e4 LT |
839 | } |
840 | ||
841 | static acpi_status __init | |
50526df6 LB |
842 | acpi_fake_ecdt_callback(acpi_handle handle, |
843 | u32 Level, void *context, void **retval) | |
1da177e4 | 844 | { |
50526df6 | 845 | acpi_status status; |
1da177e4 | 846 | |
703959d4 DS |
847 | init_MUTEX(&ec_ecdt->sem); |
848 | if (acpi_ec_mode == EC_INTR) { | |
849 | init_waitqueue_head(&ec_ecdt->wait); | |
850 | } | |
1da177e4 | 851 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 852 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
853 | if (ACPI_FAILURE(status)) |
854 | return status; | |
1da177e4 | 855 | |
703959d4 DS |
856 | ec_ecdt->uid = -1; |
857 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 858 | |
50526df6 LB |
859 | status = |
860 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
703959d4 | 861 | &ec_ecdt->gpe_bit); |
1da177e4 LT |
862 | if (ACPI_FAILURE(status)) |
863 | return status; | |
703959d4 DS |
864 | ec_ecdt->global_lock = TRUE; |
865 | ec_ecdt->handle = handle; | |
1da177e4 | 866 | |
6ffb221a DS |
867 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
868 | ec_ecdt->gpe_bit, ec_ecdt->command_addr, ec_ecdt->data_addr)); | |
1da177e4 LT |
869 | |
870 | return AE_CTRL_TERMINATE; | |
871 | } | |
872 | ||
873 | /* | |
874 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
875 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
876 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
877 | * required, but if EC regison is accessed early, it is required. | |
878 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
879 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
880 | * op region (since _REG isn't invoked yet). The assumption is true for | |
881 | * all systems found. | |
882 | */ | |
50526df6 | 883 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 884 | { |
50526df6 LB |
885 | acpi_status status; |
886 | int ret = 0; | |
1da177e4 | 887 | |
703959d4 | 888 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 889 | |
703959d4 | 890 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
891 | if (!ec_ecdt) { |
892 | ret = -ENOMEM; | |
893 | goto error; | |
894 | } | |
703959d4 | 895 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
1da177e4 | 896 | |
50526df6 LB |
897 | status = acpi_get_devices(ACPI_EC_HID, |
898 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
899 | if (ACPI_FAILURE(status)) { |
900 | kfree(ec_ecdt); | |
901 | ec_ecdt = NULL; | |
902 | ret = -ENODEV; | |
703959d4 | 903 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
904 | goto error; |
905 | } | |
906 | return 0; | |
703959d4 | 907 | error: |
1da177e4 LT |
908 | return ret; |
909 | } | |
910 | ||
50526df6 | 911 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 912 | { |
50526df6 LB |
913 | acpi_status status; |
914 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 915 | |
50526df6 LB |
916 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
917 | (struct acpi_table_header **) | |
918 | &ecdt_ptr); | |
45bea155 LY |
919 | if (ACPI_FAILURE(status)) |
920 | return -ENODEV; | |
921 | ||
703959d4 | 922 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
923 | |
924 | /* | |
925 | * Generate a temporary ec context to use until the namespace is scanned | |
926 | */ | |
703959d4 | 927 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
928 | if (!ec_ecdt) |
929 | return -ENOMEM; | |
703959d4 | 930 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
45bea155 | 931 | |
703959d4 DS |
932 | init_MUTEX(&ec_ecdt->sem); |
933 | if (acpi_ec_mode == EC_INTR) { | |
934 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 935 | } |
6ffb221a DS |
936 | ec_ecdt->command_addr = ecdt_ptr->ec_control.address; |
937 | ec_ecdt->data_addr = ecdt_ptr->ec_data.address; | |
703959d4 | 938 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; |
1da177e4 | 939 | /* use the GL just to be safe */ |
703959d4 DS |
940 | ec_ecdt->global_lock = TRUE; |
941 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 942 | |
50526df6 | 943 | status = |
703959d4 | 944 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
1da177e4 LT |
945 | if (ACPI_FAILURE(status)) { |
946 | goto error; | |
947 | } | |
948 | ||
949 | return 0; | |
703959d4 DS |
950 | error: |
951 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); | |
1da177e4 LT |
952 | kfree(ec_ecdt); |
953 | ec_ecdt = NULL; | |
954 | ||
955 | return -ENODEV; | |
956 | } | |
957 | ||
958 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 959 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 960 | { |
50526df6 LB |
961 | acpi_status status; |
962 | int ret; | |
1da177e4 LT |
963 | |
964 | ret = acpi_ec_get_real_ecdt(); | |
965 | /* Try to make a fake ECDT */ | |
966 | if (ret && acpi_fake_ecdt_enabled) { | |
967 | ret = acpi_ec_fake_ecdt(); | |
968 | } | |
969 | ||
970 | if (ret) | |
971 | return 0; | |
972 | ||
973 | /* | |
974 | * Install GPE handler | |
975 | */ | |
703959d4 | 976 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 LB |
977 | ACPI_GPE_EDGE_TRIGGERED, |
978 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
979 | if (ACPI_FAILURE(status)) { |
980 | goto error; | |
981 | } | |
703959d4 DS |
982 | acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
983 | acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
50526df6 LB |
984 | |
985 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
986 | ACPI_ADR_SPACE_EC, | |
987 | &acpi_ec_space_handler, | |
988 | &acpi_ec_space_setup, | |
989 | ec_ecdt); | |
1da177e4 | 990 | if (ACPI_FAILURE(status)) { |
703959d4 | 991 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 992 | &acpi_ec_gpe_handler); |
1da177e4 LT |
993 | goto error; |
994 | } | |
995 | ||
996 | return 0; | |
997 | ||
50526df6 | 998 | error: |
703959d4 | 999 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
1000 | kfree(ec_ecdt); |
1001 | ec_ecdt = NULL; | |
1002 | ||
1003 | return -ENODEV; | |
1004 | } | |
1005 | ||
50526df6 | 1006 | static int __init acpi_ec_init(void) |
1da177e4 | 1007 | { |
50526df6 | 1008 | int result = 0; |
1da177e4 | 1009 | |
1da177e4 LT |
1010 | |
1011 | if (acpi_disabled) | |
d550d98d | 1012 | return 0; |
1da177e4 LT |
1013 | |
1014 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1015 | if (!acpi_ec_dir) | |
d550d98d | 1016 | return -ENODEV; |
1da177e4 LT |
1017 | |
1018 | /* Now register the driver for the EC */ | |
1019 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1020 | if (result < 0) { | |
1021 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1022 | return -ENODEV; |
1da177e4 LT |
1023 | } |
1024 | ||
d550d98d | 1025 | return result; |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | subsys_initcall(acpi_ec_init); | |
1029 | ||
1030 | /* EC driver currently not unloadable */ | |
1031 | #if 0 | |
50526df6 | 1032 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1033 | { |
1da177e4 LT |
1034 | |
1035 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1036 | ||
1037 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1038 | ||
d550d98d | 1039 | return; |
1da177e4 | 1040 | } |
50526df6 | 1041 | #endif /* 0 */ |
1da177e4 LT |
1042 | |
1043 | static int __init acpi_fake_ecdt_setup(char *str) | |
1044 | { | |
1045 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1046 | return 1; |
1da177e4 | 1047 | } |
7b15f5e7 | 1048 | |
1da177e4 | 1049 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1050 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1051 | { |
02b28a33 | 1052 | int intr; |
7b15f5e7 | 1053 | |
02b28a33 | 1054 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1055 | return 0; |
1056 | ||
02b28a33 | 1057 | if (intr) { |
703959d4 | 1058 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1059 | } else { |
703959d4 | 1060 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1061 | } |
703959d4 DS |
1062 | acpi_ec_driver.ops.add = acpi_ec_add; |
1063 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); | |
1064 | ||
9b41046c | 1065 | return 1; |
45bea155 | 1066 | } |
50526df6 | 1067 | |
53f11d4f | 1068 | __setup("ec_intr=", acpi_ec_set_intr_mode); |