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