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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 | 48 | |
af3fd140 AS |
49 | #undef PREFIX |
50 | #define PREFIX "ACPI: EC: " | |
51 | ||
703959d4 | 52 | /* EC status register */ |
1da177e4 LT |
53 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
54 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
703959d4 DS |
57 | |
58 | /* EC commands */ | |
1da177e4 LT |
59 | #define ACPI_EC_COMMAND_READ 0x80 |
60 | #define ACPI_EC_COMMAND_WRITE 0x81 | |
451566f4 DT |
61 | #define ACPI_EC_BURST_ENABLE 0x82 |
62 | #define ACPI_EC_BURST_DISABLE 0x83 | |
1da177e4 | 63 | #define ACPI_EC_COMMAND_QUERY 0x84 |
703959d4 DS |
64 | |
65 | /* EC events */ | |
66 | enum { | |
67 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ | |
68 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ | |
69 | }; | |
70 | ||
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 DS |
72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
73 | #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ | |
5c406412 | 74 | #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 100ms max. during EC ops */ |
703959d4 DS |
75 | |
76 | enum { | |
77 | EC_INTR = 1, /* Output buffer full */ | |
6ffb221a | 78 | EC_POLL, /* Input buffer empty */ |
703959d4 DS |
79 | }; |
80 | ||
50526df6 LB |
81 | static int acpi_ec_remove(struct acpi_device *device, int type); |
82 | static int acpi_ec_start(struct acpi_device *device); | |
83 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 84 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
85 | |
86 | static struct acpi_driver acpi_ec_driver = { | |
50526df6 LB |
87 | .name = ACPI_EC_DRIVER_NAME, |
88 | .class = ACPI_EC_CLASS, | |
89 | .ids = ACPI_EC_HID, | |
90 | .ops = { | |
703959d4 | 91 | .add = acpi_ec_add, |
50526df6 LB |
92 | .remove = acpi_ec_remove, |
93 | .start = acpi_ec_start, | |
94 | .stop = acpi_ec_stop, | |
95 | }, | |
1da177e4 | 96 | }; |
6ffb221a DS |
97 | |
98 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
703959d4 DS |
99 | struct acpi_ec { |
100 | acpi_handle handle; | |
101 | unsigned long uid; | |
102 | unsigned long gpe_bit; | |
6ffb221a DS |
103 | unsigned long command_addr; |
104 | unsigned long data_addr; | |
703959d4 DS |
105 | unsigned long global_lock; |
106 | struct semaphore sem; | |
5d0c288b | 107 | atomic_t query_pending; |
703959d4 DS |
108 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ |
109 | wait_queue_head_t wait; | |
6ffb221a | 110 | } *ec_ecdt; |
703959d4 DS |
111 | |
112 | /* External interfaces use first EC only, so remember */ | |
113 | static struct acpi_device *first_ec; | |
114 | static int acpi_ec_mode = EC_INTR; | |
115 | ||
1da177e4 LT |
116 | /* -------------------------------------------------------------------------- |
117 | Transaction Management | |
118 | -------------------------------------------------------------------------- */ | |
119 | ||
6ffb221a | 120 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 121 | { |
6ffb221a | 122 | return inb(ec->command_addr); |
451566f4 DT |
123 | } |
124 | ||
6ffb221a | 125 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 126 | { |
6ffb221a | 127 | return inb(ec->data_addr); |
7c6db5e5 DS |
128 | } |
129 | ||
6ffb221a | 130 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 131 | { |
6ffb221a | 132 | outb(command, ec->command_addr); |
45bea155 LY |
133 | } |
134 | ||
6ffb221a | 135 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 136 | { |
6ffb221a | 137 | outb(data, ec->data_addr); |
703959d4 | 138 | } |
45bea155 | 139 | |
bec5a1e0 | 140 | static int acpi_ec_check_status(struct acpi_ec *ec, u8 event) |
6ffb221a | 141 | { |
bec5a1e0 | 142 | u8 status = acpi_ec_read_status(ec); |
45bea155 | 143 | switch (event) { |
703959d4 DS |
144 | case ACPI_EC_EVENT_OBF_1: |
145 | if (status & ACPI_EC_FLAG_OBF) | |
146 | return 1; | |
45bea155 | 147 | break; |
703959d4 DS |
148 | case ACPI_EC_EVENT_IBF_0: |
149 | if (!(status & ACPI_EC_FLAG_IBF)) | |
150 | return 1; | |
45bea155 LY |
151 | break; |
152 | default: | |
703959d4 | 153 | break; |
45bea155 LY |
154 | } |
155 | ||
703959d4 | 156 | return 0; |
45bea155 | 157 | } |
451566f4 | 158 | |
703959d4 | 159 | static int acpi_ec_wait(struct acpi_ec *ec, u8 event) |
7c6db5e5 | 160 | { |
af3fd140 AS |
161 | if (acpi_ec_mode == EC_POLL) { |
162 | int i; | |
163 | for (i = 0; i < ACPI_EC_UDELAY_COUNT; ++i) { | |
164 | if (acpi_ec_check_status(ec, event)) | |
7c6db5e5 | 165 | return 0; |
af3fd140 | 166 | udelay(ACPI_EC_UDELAY); |
7c6db5e5 | 167 | } |
af3fd140 AS |
168 | } else { |
169 | if (wait_event_timeout(ec->wait, | |
170 | acpi_ec_check_status(ec, event), | |
171 | msecs_to_jiffies(ACPI_EC_DELAY)) || | |
172 | acpi_ec_check_status(ec, event)) { | |
703959d4 | 173 | return 0; |
af3fd140 AS |
174 | } else { |
175 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
176 | " status = %d, expect_event = %d\n", | |
177 | acpi_ec_read_status(ec), event); | |
703959d4 | 178 | } |
af3fd140 | 179 | } |
1da177e4 | 180 | |
d550d98d | 181 | return -ETIME; |
1da177e4 LT |
182 | } |
183 | ||
02b28a33 | 184 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
185 | /* |
186 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
187 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
188 | */ | |
703959d4 | 189 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 190 | { |
6ffb221a DS |
191 | u8 tmp = 0; |
192 | u8 status = 0; | |
451566f4 | 193 | |
451566f4 DT |
194 | |
195 | status = acpi_ec_read_status(ec); | |
50526df6 | 196 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 197 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 198 | if (status) |
716e084e | 199 | goto end; |
703959d4 DS |
200 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
201 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
202 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 203 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 204 | return -EINVAL; |
451566f4 | 205 | } |
668d74c0 LY |
206 | } |
207 | ||
703959d4 | 208 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 209 | return 0; |
703959d4 DS |
210 | end: |
211 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); | |
d550d98d | 212 | return -1; |
451566f4 DT |
213 | } |
214 | ||
703959d4 | 215 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 216 | { |
6ffb221a | 217 | u8 status = 0; |
451566f4 | 218 | |
451566f4 | 219 | |
06a2a385 LY |
220 | status = acpi_ec_read_status(ec); |
221 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
703959d4 | 222 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
06a2a385 LY |
223 | if(status) |
224 | goto end; | |
703959d4 DS |
225 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
226 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 227 | } |
703959d4 | 228 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 229 | return 0; |
703959d4 DS |
230 | end: |
231 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); | |
d550d98d | 232 | return -1; |
451566f4 | 233 | } |
02b28a33 | 234 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 235 | |
703959d4 | 236 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
3576cf61 DS |
237 | const u8 *wdata, unsigned wdata_len, |
238 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 239 | { |
af3fd140 | 240 | int result = 0; |
45bea155 | 241 | |
703959d4 | 242 | acpi_ec_write_cmd(ec, command); |
45bea155 | 243 | |
7c6db5e5 | 244 | for (; wdata_len > 0; wdata_len --) { |
703959d4 | 245 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 AS |
246 | if (result) { |
247 | printk(KERN_ERR PREFIX "write_cmd timeout, command = %d\n", | |
248 | command); | |
249 | goto end; | |
250 | } | |
703959d4 | 251 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 252 | } |
45bea155 | 253 | |
d91df1aa | 254 | if (!rdata_len) { |
703959d4 | 255 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 AS |
256 | if (result) { |
257 | printk(KERN_ERR PREFIX "finish-write timeout, command = %d\n", | |
258 | command); | |
259 | goto end; | |
260 | } | |
5d0c288b AS |
261 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
262 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 263 | } |
45bea155 | 264 | |
7c6db5e5 | 265 | for (; rdata_len > 0; rdata_len --) { |
703959d4 | 266 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
af3fd140 AS |
267 | if (result) { |
268 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
269 | command); | |
270 | goto end; | |
271 | } | |
50526df6 | 272 | |
6ffb221a | 273 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 274 | } |
af3fd140 AS |
275 | end: |
276 | return result; | |
45bea155 LY |
277 | } |
278 | ||
3576cf61 DS |
279 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
280 | const u8 *wdata, unsigned wdata_len, | |
281 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 282 | { |
d7a76e4c | 283 | int status; |
50526df6 | 284 | u32 glk; |
1da177e4 | 285 | |
d7a76e4c | 286 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 287 | return -EINVAL; |
1da177e4 | 288 | |
d7a76e4c LP |
289 | if (rdata) |
290 | memset(rdata, 0, rdata_len); | |
1da177e4 | 291 | |
703959d4 | 292 | if (ec->global_lock) { |
1da177e4 LT |
293 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
294 | if (ACPI_FAILURE(status)) | |
d550d98d | 295 | return -ENODEV; |
1da177e4 | 296 | } |
703959d4 | 297 | down(&ec->sem); |
451566f4 | 298 | |
5d57a6a5 AS |
299 | /* Make sure GPE is enabled before doing transaction */ |
300 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
301 | ||
703959d4 | 302 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 303 | if (status) { |
3576cf61 | 304 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 305 | goto end; |
716e084e | 306 | } |
1da177e4 | 307 | |
d7a76e4c LP |
308 | status = acpi_ec_transaction_unlocked(ec, command, |
309 | wdata, wdata_len, | |
310 | rdata, rdata_len); | |
1da177e4 | 311 | |
d7a76e4c | 312 | end: |
703959d4 | 313 | up(&ec->sem); |
1da177e4 | 314 | |
703959d4 | 315 | if (ec->global_lock) |
1da177e4 LT |
316 | acpi_release_global_lock(glk); |
317 | ||
d550d98d | 318 | return status; |
1da177e4 LT |
319 | } |
320 | ||
6ffb221a | 321 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
322 | { |
323 | int result; | |
324 | u8 d; | |
325 | ||
326 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
327 | &address, 1, &d, 1); | |
328 | *data = d; | |
329 | return result; | |
330 | } | |
6ffb221a | 331 | |
3576cf61 DS |
332 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
333 | { | |
334 | u8 wdata[2] = { address, data }; | |
335 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
336 | wdata, 2, NULL, 0); | |
337 | } | |
338 | ||
1da177e4 LT |
339 | /* |
340 | * Externally callable EC access functions. For now, assume 1 EC only | |
341 | */ | |
6ffb221a | 342 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 343 | { |
703959d4 | 344 | struct acpi_ec *ec; |
1da177e4 | 345 | int err; |
6ffb221a | 346 | u8 temp_data; |
1da177e4 LT |
347 | |
348 | if (!first_ec) | |
349 | return -ENODEV; | |
350 | ||
351 | ec = acpi_driver_data(first_ec); | |
352 | ||
353 | err = acpi_ec_read(ec, addr, &temp_data); | |
354 | ||
355 | if (!err) { | |
356 | *val = temp_data; | |
357 | return 0; | |
50526df6 | 358 | } else |
1da177e4 LT |
359 | return err; |
360 | } | |
50526df6 | 361 | |
1da177e4 LT |
362 | EXPORT_SYMBOL(ec_read); |
363 | ||
50526df6 | 364 | int ec_write(u8 addr, u8 val) |
1da177e4 | 365 | { |
703959d4 | 366 | struct acpi_ec *ec; |
1da177e4 LT |
367 | int err; |
368 | ||
369 | if (!first_ec) | |
370 | return -ENODEV; | |
371 | ||
372 | ec = acpi_driver_data(first_ec); | |
373 | ||
374 | err = acpi_ec_write(ec, addr, val); | |
375 | ||
376 | return err; | |
377 | } | |
50526df6 | 378 | |
1da177e4 LT |
379 | EXPORT_SYMBOL(ec_write); |
380 | ||
d7a76e4c LP |
381 | extern int ec_transaction(u8 command, |
382 | const u8 *wdata, unsigned wdata_len, | |
383 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 384 | { |
703959d4 | 385 | struct acpi_ec *ec; |
45bea155 | 386 | |
d7a76e4c LP |
387 | if (!first_ec) |
388 | return -ENODEV; | |
45bea155 | 389 | |
d7a76e4c | 390 | ec = acpi_driver_data(first_ec); |
45bea155 | 391 | |
3576cf61 DS |
392 | return acpi_ec_transaction(ec, command, wdata, |
393 | wdata_len, rdata, rdata_len); | |
45bea155 | 394 | } |
1da177e4 | 395 | |
ab9e43c6 LP |
396 | EXPORT_SYMBOL(ec_transaction); |
397 | ||
6ffb221a | 398 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
3576cf61 DS |
399 | { |
400 | int result; | |
d7a76e4c | 401 | u8 d; |
1da177e4 | 402 | |
d7a76e4c LP |
403 | if (!ec || !data) |
404 | return -EINVAL; | |
1da177e4 | 405 | |
d7a76e4c LP |
406 | /* |
407 | * Query the EC to find out which _Qxx method we need to evaluate. | |
408 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
409 | * bit to be cleared (and thus clearing the interrupt source). | |
410 | */ | |
716e084e | 411 | |
d7a76e4c LP |
412 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
413 | if (result) | |
414 | return result; | |
1da177e4 | 415 | |
d7a76e4c LP |
416 | if (!d) |
417 | return -ENODATA; | |
1da177e4 | 418 | |
d7a76e4c LP |
419 | *data = d; |
420 | return 0; | |
1da177e4 LT |
421 | } |
422 | ||
1da177e4 LT |
423 | /* -------------------------------------------------------------------------- |
424 | Event Management | |
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 | 430 | u8 value = 0; |
5d0c288b | 431 | char object_name[8]; |
45bea155 | 432 | |
5d0c288b | 433 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 434 | return; |
45bea155 | 435 | |
6ffb221a | 436 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 437 | |
af3fd140 | 438 | printk(KERN_INFO PREFIX "evaluating %s\n", object_name); |
45bea155 | 439 | |
703959d4 | 440 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 441 | } |
1da177e4 | 442 | |
50526df6 | 443 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 444 | { |
50526df6 | 445 | acpi_status status = AE_OK; |
6ffb221a | 446 | u8 value; |
703959d4 | 447 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 448 | |
1da177e4 | 449 | |
8e0341ba | 450 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 451 | wake_up(&ec->wait); |
451566f4 DT |
452 | } |
453 | ||
bec5a1e0 | 454 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
455 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
456 | atomic_set(&ec->query_pending, 1); | |
6ffb221a | 457 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); |
50526df6 | 458 | } |
e41334c0 | 459 | |
451566f4 | 460 | return status == AE_OK ? |
50526df6 | 461 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
462 | } |
463 | ||
464 | /* -------------------------------------------------------------------------- | |
465 | Address Space Management | |
466 | -------------------------------------------------------------------------- */ | |
467 | ||
468 | static acpi_status | |
50526df6 LB |
469 | acpi_ec_space_setup(acpi_handle region_handle, |
470 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
471 | { |
472 | /* | |
473 | * The EC object is in the handler context and is needed | |
474 | * when calling the acpi_ec_space_handler. | |
475 | */ | |
50526df6 LB |
476 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
477 | handler_context : NULL; | |
1da177e4 LT |
478 | |
479 | return AE_OK; | |
480 | } | |
481 | ||
1da177e4 | 482 | static acpi_status |
50526df6 LB |
483 | acpi_ec_space_handler(u32 function, |
484 | acpi_physical_address address, | |
485 | u32 bit_width, | |
486 | acpi_integer * value, | |
487 | void *handler_context, void *region_context) | |
1da177e4 | 488 | { |
50526df6 | 489 | int result = 0; |
703959d4 | 490 | struct acpi_ec *ec = NULL; |
50526df6 LB |
491 | u64 temp = *value; |
492 | acpi_integer f_v = 0; | |
493 | int i = 0; | |
1da177e4 | 494 | |
1da177e4 LT |
495 | |
496 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 497 | return AE_BAD_PARAMETER; |
1da177e4 | 498 | |
fa9cd547 | 499 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 500 | return AE_BAD_PARAMETER; |
1da177e4 LT |
501 | } |
502 | ||
703959d4 | 503 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 504 | |
50526df6 | 505 | next_byte: |
1da177e4 LT |
506 | switch (function) { |
507 | case ACPI_READ: | |
fa9cd547 | 508 | temp = 0; |
6ffb221a | 509 | result = acpi_ec_read(ec, (u8) address, (u8 *) &temp); |
1da177e4 LT |
510 | break; |
511 | case ACPI_WRITE: | |
fa9cd547 | 512 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
513 | break; |
514 | default: | |
515 | result = -EINVAL; | |
516 | goto out; | |
517 | break; | |
518 | } | |
519 | ||
520 | bit_width -= 8; | |
fa9cd547 LY |
521 | if (bit_width) { |
522 | if (function == ACPI_READ) | |
523 | f_v |= temp << 8 * i; | |
524 | if (function == ACPI_WRITE) | |
525 | temp >>= 8; | |
1da177e4 | 526 | i++; |
83ea7445 | 527 | address++; |
1da177e4 LT |
528 | goto next_byte; |
529 | } | |
530 | ||
fa9cd547 LY |
531 | if (function == ACPI_READ) { |
532 | f_v |= temp << 8 * i; | |
1da177e4 LT |
533 | *value = f_v; |
534 | } | |
535 | ||
50526df6 | 536 | out: |
1da177e4 LT |
537 | switch (result) { |
538 | case -EINVAL: | |
d550d98d | 539 | return AE_BAD_PARAMETER; |
1da177e4 LT |
540 | break; |
541 | case -ENODEV: | |
d550d98d | 542 | return AE_NOT_FOUND; |
1da177e4 LT |
543 | break; |
544 | case -ETIME: | |
d550d98d | 545 | return AE_TIME; |
1da177e4 LT |
546 | break; |
547 | default: | |
d550d98d | 548 | return AE_OK; |
1da177e4 | 549 | } |
1da177e4 LT |
550 | } |
551 | ||
1da177e4 LT |
552 | /* -------------------------------------------------------------------------- |
553 | FS Interface (/proc) | |
554 | -------------------------------------------------------------------------- */ | |
555 | ||
50526df6 | 556 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 557 | |
50526df6 | 558 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 559 | { |
703959d4 | 560 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 561 | |
1da177e4 LT |
562 | |
563 | if (!ec) | |
564 | goto end; | |
565 | ||
566 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
703959d4 | 567 | (u32) ec->gpe_bit); |
1da177e4 | 568 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ffb221a DS |
569 | (u32) ec->command_addr, |
570 | (u32) ec->data_addr); | |
1da177e4 | 571 | seq_printf(seq, "use global lock: %s\n", |
703959d4 DS |
572 | ec->global_lock ? "yes" : "no"); |
573 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 574 | |
50526df6 | 575 | end: |
d550d98d | 576 | return 0; |
1da177e4 LT |
577 | } |
578 | ||
579 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
580 | { | |
581 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
582 | } | |
583 | ||
703959d4 | 584 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
585 | .open = acpi_ec_info_open_fs, |
586 | .read = seq_read, | |
587 | .llseek = seq_lseek, | |
588 | .release = single_release, | |
1da177e4 LT |
589 | .owner = THIS_MODULE, |
590 | }; | |
591 | ||
50526df6 | 592 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 593 | { |
50526df6 | 594 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 595 | |
1da177e4 LT |
596 | |
597 | if (!acpi_device_dir(device)) { | |
598 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 599 | acpi_ec_dir); |
1da177e4 | 600 | if (!acpi_device_dir(device)) |
d550d98d | 601 | return -ENODEV; |
1da177e4 LT |
602 | } |
603 | ||
604 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 605 | acpi_device_dir(device)); |
1da177e4 | 606 | if (!entry) |
d550d98d | 607 | return -ENODEV; |
1da177e4 LT |
608 | else { |
609 | entry->proc_fops = &acpi_ec_info_ops; | |
610 | entry->data = acpi_driver_data(device); | |
611 | entry->owner = THIS_MODULE; | |
612 | } | |
613 | ||
d550d98d | 614 | return 0; |
1da177e4 LT |
615 | } |
616 | ||
50526df6 | 617 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 618 | { |
1da177e4 LT |
619 | |
620 | if (acpi_device_dir(device)) { | |
621 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
622 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
623 | acpi_device_dir(device) = NULL; | |
624 | } | |
625 | ||
d550d98d | 626 | return 0; |
1da177e4 LT |
627 | } |
628 | ||
1da177e4 LT |
629 | /* -------------------------------------------------------------------------- |
630 | Driver Interface | |
631 | -------------------------------------------------------------------------- */ | |
632 | ||
703959d4 | 633 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 634 | { |
50526df6 LB |
635 | int result = 0; |
636 | acpi_status status = AE_OK; | |
703959d4 | 637 | struct acpi_ec *ec = NULL; |
45bea155 | 638 | |
45bea155 LY |
639 | |
640 | if (!device) | |
d550d98d | 641 | return -EINVAL; |
45bea155 | 642 | |
703959d4 | 643 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 644 | if (!ec) |
d550d98d | 645 | return -ENOMEM; |
703959d4 DS |
646 | memset(ec, 0, sizeof(struct acpi_ec)); |
647 | ||
648 | ec->handle = device->handle; | |
649 | ec->uid = -1; | |
650 | init_MUTEX(&ec->sem); | |
5d0c288b | 651 | atomic_set(&ec->query_pending, 0); |
703959d4 DS |
652 | if (acpi_ec_mode == EC_INTR) { |
653 | atomic_set(&ec->leaving_burst, 1); | |
654 | init_waitqueue_head(&ec->wait); | |
45bea155 | 655 | } |
1da177e4 LT |
656 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
657 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
658 | acpi_driver_data(device) = ec; | |
659 | ||
660 | /* Use the global lock for all EC transactions? */ | |
703959d4 DS |
661 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, |
662 | &ec->global_lock); | |
1da177e4 | 663 | |
ff2fc3e9 JS |
664 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
665 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
666 | if (ec_ecdt) { | |
1da177e4 | 667 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
668 | ACPI_ADR_SPACE_EC, |
669 | &acpi_ec_space_handler); | |
451566f4 | 670 | |
703959d4 | 671 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 672 | &acpi_ec_gpe_handler); |
1da177e4 LT |
673 | |
674 | kfree(ec_ecdt); | |
675 | } | |
676 | ||
677 | /* Get GPE bit assignment (EC events). */ | |
678 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 | 679 | status = |
703959d4 DS |
680 | acpi_evaluate_integer(ec->handle, "_GPE", NULL, |
681 | &ec->gpe_bit); | |
1da177e4 | 682 | if (ACPI_FAILURE(status)) { |
703959d4 | 683 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); |
1da177e4 LT |
684 | result = -ENODEV; |
685 | goto end; | |
686 | } | |
687 | ||
688 | result = acpi_ec_add_fs(device); | |
689 | if (result) | |
690 | goto end; | |
691 | ||
703959d4 | 692 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
50526df6 | 693 | acpi_device_name(device), acpi_device_bid(device), |
703959d4 | 694 | (u32) ec->gpe_bit)); |
1da177e4 LT |
695 | |
696 | if (!first_ec) | |
697 | first_ec = device; | |
698 | ||
703959d4 | 699 | end: |
1da177e4 LT |
700 | if (result) |
701 | kfree(ec); | |
702 | ||
d550d98d | 703 | return result; |
1da177e4 LT |
704 | } |
705 | ||
50526df6 | 706 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 707 | { |
703959d4 | 708 | struct acpi_ec *ec = NULL; |
1da177e4 | 709 | |
1da177e4 LT |
710 | |
711 | if (!device) | |
d550d98d | 712 | return -EINVAL; |
1da177e4 LT |
713 | |
714 | ec = acpi_driver_data(device); | |
715 | ||
716 | acpi_ec_remove_fs(device); | |
717 | ||
718 | kfree(ec); | |
719 | ||
d550d98d | 720 | return 0; |
1da177e4 LT |
721 | } |
722 | ||
1da177e4 | 723 | static acpi_status |
50526df6 | 724 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 725 | { |
703959d4 | 726 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 727 | |
50eca3eb | 728 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
729 | return AE_OK; |
730 | } | |
731 | ||
732 | /* | |
733 | * The first address region returned is the data port, and | |
734 | * the second address region returned is the status/command | |
735 | * port. | |
736 | */ | |
6ffb221a DS |
737 | if (ec->data_addr == 0) { |
738 | ec->data_addr = resource->data.io.minimum; | |
739 | } else if (ec->command_addr == 0) { | |
740 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
741 | } else { |
742 | return AE_CTRL_TERMINATE; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | return AE_OK; |
746 | } | |
747 | ||
50526df6 | 748 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 749 | { |
50526df6 | 750 | acpi_status status = AE_OK; |
703959d4 | 751 | struct acpi_ec *ec = NULL; |
1da177e4 | 752 | |
1da177e4 LT |
753 | |
754 | if (!device) | |
d550d98d | 755 | return -EINVAL; |
1da177e4 LT |
756 | |
757 | ec = acpi_driver_data(device); | |
758 | ||
759 | if (!ec) | |
d550d98d | 760 | return -EINVAL; |
1da177e4 LT |
761 | |
762 | /* | |
763 | * Get I/O port addresses. Convert to GAS format. | |
764 | */ | |
703959d4 | 765 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 766 | acpi_ec_io_ports, ec); |
6ffb221a | 767 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
768 | ACPI_EXCEPTION((AE_INFO, status, |
769 | "Error getting I/O port addresses")); | |
d550d98d | 770 | return -ENODEV; |
1da177e4 LT |
771 | } |
772 | ||
6ffb221a DS |
773 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
774 | ec->gpe_bit, ec->command_addr, ec->data_addr)); | |
1da177e4 LT |
775 | |
776 | /* | |
777 | * Install GPE handler | |
778 | */ | |
703959d4 | 779 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, |
50526df6 LB |
780 | ACPI_GPE_EDGE_TRIGGERED, |
781 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 782 | if (ACPI_FAILURE(status)) { |
d550d98d | 783 | return -ENODEV; |
1da177e4 | 784 | } |
703959d4 DS |
785 | acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
786 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 787 | |
703959d4 | 788 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
789 | ACPI_ADR_SPACE_EC, |
790 | &acpi_ec_space_handler, | |
791 | &acpi_ec_space_setup, ec); | |
1da177e4 | 792 | if (ACPI_FAILURE(status)) { |
703959d4 | 793 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 794 | &acpi_ec_gpe_handler); |
d550d98d | 795 | return -ENODEV; |
1da177e4 LT |
796 | } |
797 | ||
d550d98d | 798 | return AE_OK; |
1da177e4 LT |
799 | } |
800 | ||
50526df6 | 801 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 802 | { |
50526df6 | 803 | acpi_status status = AE_OK; |
703959d4 | 804 | struct acpi_ec *ec = NULL; |
1da177e4 | 805 | |
1da177e4 LT |
806 | |
807 | if (!device) | |
d550d98d | 808 | return -EINVAL; |
1da177e4 LT |
809 | |
810 | ec = acpi_driver_data(device); | |
811 | ||
703959d4 | 812 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
813 | ACPI_ADR_SPACE_EC, |
814 | &acpi_ec_space_handler); | |
1da177e4 | 815 | if (ACPI_FAILURE(status)) |
d550d98d | 816 | return -ENODEV; |
1da177e4 | 817 | |
50526df6 | 818 | status = |
703959d4 | 819 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 820 | &acpi_ec_gpe_handler); |
1da177e4 | 821 | if (ACPI_FAILURE(status)) |
d550d98d | 822 | return -ENODEV; |
1da177e4 | 823 | |
d550d98d | 824 | return 0; |
1da177e4 LT |
825 | } |
826 | ||
827 | static acpi_status __init | |
50526df6 LB |
828 | acpi_fake_ecdt_callback(acpi_handle handle, |
829 | u32 Level, void *context, void **retval) | |
1da177e4 | 830 | { |
50526df6 | 831 | acpi_status status; |
1da177e4 | 832 | |
703959d4 DS |
833 | init_MUTEX(&ec_ecdt->sem); |
834 | if (acpi_ec_mode == EC_INTR) { | |
835 | init_waitqueue_head(&ec_ecdt->wait); | |
836 | } | |
1da177e4 | 837 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 838 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
839 | if (ACPI_FAILURE(status)) |
840 | return status; | |
1da177e4 | 841 | |
703959d4 DS |
842 | ec_ecdt->uid = -1; |
843 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 844 | |
50526df6 LB |
845 | status = |
846 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
703959d4 | 847 | &ec_ecdt->gpe_bit); |
1da177e4 LT |
848 | if (ACPI_FAILURE(status)) |
849 | return status; | |
703959d4 DS |
850 | ec_ecdt->global_lock = TRUE; |
851 | ec_ecdt->handle = handle; | |
1da177e4 | 852 | |
6ffb221a DS |
853 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
854 | ec_ecdt->gpe_bit, ec_ecdt->command_addr, ec_ecdt->data_addr)); | |
1da177e4 LT |
855 | |
856 | return AE_CTRL_TERMINATE; | |
857 | } | |
858 | ||
859 | /* | |
860 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
861 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
862 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
863 | * required, but if EC regison is accessed early, it is required. | |
864 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
865 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
866 | * op region (since _REG isn't invoked yet). The assumption is true for | |
867 | * all systems found. | |
868 | */ | |
50526df6 | 869 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 870 | { |
50526df6 LB |
871 | acpi_status status; |
872 | int ret = 0; | |
1da177e4 | 873 | |
703959d4 | 874 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 875 | |
703959d4 | 876 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
877 | if (!ec_ecdt) { |
878 | ret = -ENOMEM; | |
879 | goto error; | |
880 | } | |
703959d4 | 881 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
1da177e4 | 882 | |
50526df6 LB |
883 | status = acpi_get_devices(ACPI_EC_HID, |
884 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
885 | if (ACPI_FAILURE(status)) { |
886 | kfree(ec_ecdt); | |
887 | ec_ecdt = NULL; | |
888 | ret = -ENODEV; | |
703959d4 | 889 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
890 | goto error; |
891 | } | |
892 | return 0; | |
703959d4 | 893 | error: |
1da177e4 LT |
894 | return ret; |
895 | } | |
896 | ||
50526df6 | 897 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 898 | { |
50526df6 LB |
899 | acpi_status status; |
900 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 901 | |
50526df6 LB |
902 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
903 | (struct acpi_table_header **) | |
904 | &ecdt_ptr); | |
45bea155 LY |
905 | if (ACPI_FAILURE(status)) |
906 | return -ENODEV; | |
907 | ||
703959d4 | 908 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
909 | |
910 | /* | |
911 | * Generate a temporary ec context to use until the namespace is scanned | |
912 | */ | |
703959d4 | 913 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
914 | if (!ec_ecdt) |
915 | return -ENOMEM; | |
703959d4 | 916 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
45bea155 | 917 | |
703959d4 DS |
918 | init_MUTEX(&ec_ecdt->sem); |
919 | if (acpi_ec_mode == EC_INTR) { | |
920 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 921 | } |
6ffb221a DS |
922 | ec_ecdt->command_addr = ecdt_ptr->ec_control.address; |
923 | ec_ecdt->data_addr = ecdt_ptr->ec_data.address; | |
703959d4 | 924 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; |
1da177e4 | 925 | /* use the GL just to be safe */ |
703959d4 DS |
926 | ec_ecdt->global_lock = TRUE; |
927 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 928 | |
50526df6 | 929 | status = |
703959d4 | 930 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
1da177e4 LT |
931 | if (ACPI_FAILURE(status)) { |
932 | goto error; | |
933 | } | |
934 | ||
935 | return 0; | |
703959d4 DS |
936 | error: |
937 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); | |
1da177e4 LT |
938 | kfree(ec_ecdt); |
939 | ec_ecdt = NULL; | |
940 | ||
941 | return -ENODEV; | |
942 | } | |
943 | ||
944 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 945 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 946 | { |
50526df6 LB |
947 | acpi_status status; |
948 | int ret; | |
1da177e4 LT |
949 | |
950 | ret = acpi_ec_get_real_ecdt(); | |
951 | /* Try to make a fake ECDT */ | |
952 | if (ret && acpi_fake_ecdt_enabled) { | |
953 | ret = acpi_ec_fake_ecdt(); | |
954 | } | |
955 | ||
956 | if (ret) | |
957 | return 0; | |
958 | ||
959 | /* | |
960 | * Install GPE handler | |
961 | */ | |
703959d4 | 962 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 LB |
963 | ACPI_GPE_EDGE_TRIGGERED, |
964 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
965 | if (ACPI_FAILURE(status)) { |
966 | goto error; | |
967 | } | |
703959d4 DS |
968 | acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
969 | acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
50526df6 LB |
970 | |
971 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
972 | ACPI_ADR_SPACE_EC, | |
973 | &acpi_ec_space_handler, | |
974 | &acpi_ec_space_setup, | |
975 | ec_ecdt); | |
1da177e4 | 976 | if (ACPI_FAILURE(status)) { |
703959d4 | 977 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 978 | &acpi_ec_gpe_handler); |
1da177e4 LT |
979 | goto error; |
980 | } | |
981 | ||
982 | return 0; | |
983 | ||
50526df6 | 984 | error: |
703959d4 | 985 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
986 | kfree(ec_ecdt); |
987 | ec_ecdt = NULL; | |
988 | ||
989 | return -ENODEV; | |
990 | } | |
991 | ||
50526df6 | 992 | static int __init acpi_ec_init(void) |
1da177e4 | 993 | { |
50526df6 | 994 | int result = 0; |
1da177e4 | 995 | |
1da177e4 LT |
996 | |
997 | if (acpi_disabled) | |
d550d98d | 998 | return 0; |
1da177e4 LT |
999 | |
1000 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1001 | if (!acpi_ec_dir) | |
d550d98d | 1002 | return -ENODEV; |
1da177e4 LT |
1003 | |
1004 | /* Now register the driver for the EC */ | |
1005 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1006 | if (result < 0) { | |
1007 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1008 | return -ENODEV; |
1da177e4 LT |
1009 | } |
1010 | ||
d550d98d | 1011 | return result; |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | subsys_initcall(acpi_ec_init); | |
1015 | ||
1016 | /* EC driver currently not unloadable */ | |
1017 | #if 0 | |
50526df6 | 1018 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1019 | { |
1da177e4 LT |
1020 | |
1021 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1022 | ||
1023 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1024 | ||
d550d98d | 1025 | return; |
1da177e4 | 1026 | } |
50526df6 | 1027 | #endif /* 0 */ |
1da177e4 LT |
1028 | |
1029 | static int __init acpi_fake_ecdt_setup(char *str) | |
1030 | { | |
1031 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1032 | return 1; |
1da177e4 | 1033 | } |
7b15f5e7 | 1034 | |
1da177e4 | 1035 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1036 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1037 | { |
02b28a33 | 1038 | int intr; |
7b15f5e7 | 1039 | |
02b28a33 | 1040 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1041 | return 0; |
1042 | ||
02b28a33 | 1043 | if (intr) { |
703959d4 | 1044 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1045 | } else { |
703959d4 | 1046 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1047 | } |
703959d4 DS |
1048 | acpi_ec_driver.ops.add = acpi_ec_add; |
1049 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); | |
1050 | ||
9b41046c | 1051 | return 1; |
45bea155 | 1052 | } |
50526df6 | 1053 | |
53f11d4f | 1054 | __setup("ec_intr=", acpi_ec_set_intr_mode); |