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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 */ | |
75 | EC_POLL, /* Input buffer empty */ | |
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 | }; |
703959d4 DS |
94 | struct acpi_ec { |
95 | acpi_handle handle; | |
96 | unsigned long uid; | |
97 | unsigned long gpe_bit; | |
98 | struct acpi_generic_address status_addr; | |
99 | struct acpi_generic_address command_addr; | |
100 | struct acpi_generic_address data_addr; | |
101 | unsigned long global_lock; | |
102 | struct semaphore sem; | |
103 | unsigned int expect_event; | |
104 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ | |
105 | wait_queue_head_t wait; | |
1da177e4 LT |
106 | }; |
107 | ||
703959d4 DS |
108 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
109 | static struct acpi_ec *ec_ecdt; | |
110 | ||
111 | /* External interfaces use first EC only, so remember */ | |
112 | static struct acpi_device *first_ec; | |
113 | static int acpi_ec_mode = EC_INTR; | |
114 | ||
1da177e4 LT |
115 | /* -------------------------------------------------------------------------- |
116 | Transaction Management | |
117 | -------------------------------------------------------------------------- */ | |
118 | ||
703959d4 | 119 | static u32 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 120 | { |
50526df6 | 121 | u32 status = 0; |
1da177e4 | 122 | |
703959d4 | 123 | acpi_hw_low_level_read(8, &status, &ec->status_addr); |
451566f4 DT |
124 | return status; |
125 | } | |
126 | ||
703959d4 DS |
127 | static u32 acpi_ec_read_data(struct acpi_ec *ec) |
128 | { | |
129 | u32 data = 0; | |
7c6db5e5 | 130 | |
703959d4 DS |
131 | acpi_hw_low_level_read(8, &data, &ec->data_addr); |
132 | return data; | |
7c6db5e5 DS |
133 | } |
134 | ||
703959d4 | 135 | static void acpi_ec_write_cmd(struct acpi_ec *ec, u32 command) |
45bea155 | 136 | { |
703959d4 | 137 | acpi_hw_low_level_write(8, command, &ec->command_addr); |
45bea155 LY |
138 | } |
139 | ||
703959d4 | 140 | static void acpi_ec_write_data(struct acpi_ec *ec, u32 data) |
45bea155 | 141 | { |
703959d4 DS |
142 | acpi_hw_low_level_write(8, data, &ec->data_addr); |
143 | } | |
45bea155 | 144 | |
703959d4 | 145 | static int acpi_ec_check_status(u32 status, u8 event) { |
45bea155 | 146 | |
45bea155 | 147 | switch (event) { |
703959d4 DS |
148 | case ACPI_EC_EVENT_OBF_1: |
149 | if (status & ACPI_EC_FLAG_OBF) | |
150 | return 1; | |
45bea155 | 151 | break; |
703959d4 DS |
152 | case ACPI_EC_EVENT_IBF_0: |
153 | if (!(status & ACPI_EC_FLAG_IBF)) | |
154 | return 1; | |
45bea155 LY |
155 | break; |
156 | default: | |
703959d4 | 157 | break; |
45bea155 LY |
158 | } |
159 | ||
703959d4 | 160 | return 0; |
45bea155 | 161 | } |
451566f4 | 162 | |
703959d4 | 163 | static int acpi_ec_wait(struct acpi_ec *ec, u8 event) |
7c6db5e5 | 164 | { |
703959d4 DS |
165 | int i = (acpi_ec_mode == EC_POLL) ? ACPI_EC_UDELAY_COUNT : 0; |
166 | long time_left; | |
451566f4 | 167 | |
703959d4 | 168 | ec->expect_event = event; |
7c6db5e5 | 169 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { |
703959d4 DS |
170 | ec->expect_event = 0; |
171 | return 0; | |
716e084e LY |
172 | } |
173 | ||
703959d4 DS |
174 | do { |
175 | if (acpi_ec_mode == EC_POLL) { | |
176 | udelay(ACPI_EC_UDELAY); | |
177 | } else { | |
178 | time_left = wait_event_timeout(ec->wait, | |
179 | !ec->expect_event, | |
180 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
181 | if (time_left > 0) { | |
182 | ec->expect_event = 0; | |
7c6db5e5 | 183 | return 0; |
703959d4 | 184 | } |
7c6db5e5 | 185 | } |
703959d4 DS |
186 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { |
187 | ec->expect_event = 0; | |
188 | return 0; | |
189 | } | |
190 | } while (--i > 0); | |
191 | ||
192 | ec->expect_event = 0; | |
1da177e4 | 193 | |
d550d98d | 194 | return -ETIME; |
1da177e4 LT |
195 | } |
196 | ||
02b28a33 | 197 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
198 | /* |
199 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
200 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
201 | */ | |
703959d4 | 202 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 203 | { |
50526df6 | 204 | u32 tmp = 0; |
703959d4 | 205 | u32 status = 0; |
451566f4 | 206 | |
451566f4 DT |
207 | |
208 | status = acpi_ec_read_status(ec); | |
50526df6 | 209 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 210 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 211 | if (status) |
716e084e | 212 | goto end; |
703959d4 DS |
213 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
214 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
215 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 216 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 217 | return -EINVAL; |
451566f4 | 218 | } |
668d74c0 LY |
219 | } |
220 | ||
703959d4 | 221 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 222 | return 0; |
703959d4 DS |
223 | end: |
224 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); | |
d550d98d | 225 | return -1; |
451566f4 DT |
226 | } |
227 | ||
703959d4 | 228 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 229 | { |
703959d4 | 230 | u32 status = 0; |
451566f4 | 231 | |
451566f4 | 232 | |
06a2a385 LY |
233 | status = acpi_ec_read_status(ec); |
234 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
703959d4 | 235 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
06a2a385 LY |
236 | if(status) |
237 | goto end; | |
703959d4 DS |
238 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
239 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 240 | } |
703959d4 | 241 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 242 | return 0; |
703959d4 DS |
243 | end: |
244 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); | |
d550d98d | 245 | return -1; |
451566f4 | 246 | } |
02b28a33 | 247 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 248 | |
703959d4 | 249 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
3576cf61 DS |
250 | const u8 *wdata, unsigned wdata_len, |
251 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 252 | { |
d7a76e4c | 253 | int result; |
45bea155 | 254 | |
703959d4 | 255 | acpi_ec_write_cmd(ec, command); |
45bea155 | 256 | |
7c6db5e5 | 257 | for (; wdata_len > 0; wdata_len --) { |
703959d4 | 258 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
259 | if (result) |
260 | return result; | |
703959d4 | 261 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 262 | } |
45bea155 | 263 | |
7c6db5e5 | 264 | if (command == ACPI_EC_COMMAND_WRITE) { |
703959d4 | 265 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
7c6db5e5 DS |
266 | if (result) |
267 | return result; | |
268 | } | |
45bea155 | 269 | |
7c6db5e5 DS |
270 | for (; rdata_len > 0; rdata_len --) { |
271 | u32 d; | |
45bea155 | 272 | |
703959d4 | 273 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
7c6db5e5 DS |
274 | if (result) |
275 | return result; | |
50526df6 | 276 | |
703959d4 | 277 | d = acpi_ec_read_data(ec); |
7c6db5e5 DS |
278 | *(rdata++) = (u8) d; |
279 | } | |
45bea155 | 280 | |
7c6db5e5 | 281 | return 0; |
45bea155 LY |
282 | } |
283 | ||
3576cf61 DS |
284 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
285 | const u8 *wdata, unsigned wdata_len, | |
286 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 287 | { |
d7a76e4c | 288 | int status; |
50526df6 | 289 | u32 glk; |
1da177e4 | 290 | |
d7a76e4c | 291 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 292 | return -EINVAL; |
1da177e4 | 293 | |
d7a76e4c LP |
294 | if (rdata) |
295 | memset(rdata, 0, rdata_len); | |
1da177e4 | 296 | |
703959d4 | 297 | if (ec->global_lock) { |
1da177e4 LT |
298 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
299 | if (ACPI_FAILURE(status)) | |
d550d98d | 300 | return -ENODEV; |
1da177e4 | 301 | } |
703959d4 | 302 | down(&ec->sem); |
451566f4 | 303 | |
703959d4 | 304 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 305 | if (status) { |
3576cf61 | 306 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 307 | goto end; |
716e084e | 308 | } |
1da177e4 | 309 | |
d7a76e4c LP |
310 | status = acpi_ec_transaction_unlocked(ec, command, |
311 | wdata, wdata_len, | |
312 | rdata, rdata_len); | |
1da177e4 | 313 | |
d7a76e4c | 314 | end: |
703959d4 | 315 | up(&ec->sem); |
1da177e4 | 316 | |
703959d4 | 317 | if (ec->global_lock) |
1da177e4 LT |
318 | acpi_release_global_lock(glk); |
319 | ||
d550d98d | 320 | return status; |
1da177e4 LT |
321 | } |
322 | ||
3576cf61 DS |
323 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u32 * data) |
324 | { | |
325 | int result; | |
326 | u8 d; | |
327 | ||
328 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
329 | &address, 1, &d, 1); | |
330 | *data = d; | |
331 | return result; | |
332 | } | |
333 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) | |
334 | { | |
335 | u8 wdata[2] = { address, data }; | |
336 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
337 | wdata, 2, NULL, 0); | |
338 | } | |
339 | ||
1da177e4 LT |
340 | /* |
341 | * Externally callable EC access functions. For now, assume 1 EC only | |
342 | */ | |
50526df6 | 343 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 344 | { |
703959d4 | 345 | struct acpi_ec *ec; |
1da177e4 LT |
346 | int err; |
347 | u32 temp_data; | |
348 | ||
349 | if (!first_ec) | |
350 | return -ENODEV; | |
351 | ||
352 | ec = acpi_driver_data(first_ec); | |
353 | ||
354 | err = acpi_ec_read(ec, addr, &temp_data); | |
355 | ||
356 | if (!err) { | |
357 | *val = temp_data; | |
358 | return 0; | |
50526df6 | 359 | } else |
1da177e4 LT |
360 | return err; |
361 | } | |
50526df6 | 362 | |
1da177e4 LT |
363 | EXPORT_SYMBOL(ec_read); |
364 | ||
50526df6 | 365 | int ec_write(u8 addr, u8 val) |
1da177e4 | 366 | { |
703959d4 | 367 | struct acpi_ec *ec; |
1da177e4 LT |
368 | int err; |
369 | ||
370 | if (!first_ec) | |
371 | return -ENODEV; | |
372 | ||
373 | ec = acpi_driver_data(first_ec); | |
374 | ||
375 | err = acpi_ec_write(ec, addr, val); | |
376 | ||
377 | return err; | |
378 | } | |
50526df6 | 379 | |
1da177e4 LT |
380 | EXPORT_SYMBOL(ec_write); |
381 | ||
d7a76e4c LP |
382 | extern int ec_transaction(u8 command, |
383 | const u8 *wdata, unsigned wdata_len, | |
384 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 385 | { |
703959d4 | 386 | struct acpi_ec *ec; |
45bea155 | 387 | |
d7a76e4c LP |
388 | if (!first_ec) |
389 | return -ENODEV; | |
45bea155 | 390 | |
d7a76e4c | 391 | ec = acpi_driver_data(first_ec); |
45bea155 | 392 | |
3576cf61 DS |
393 | return acpi_ec_transaction(ec, command, wdata, |
394 | wdata_len, rdata, rdata_len); | |
45bea155 | 395 | } |
1da177e4 | 396 | |
3576cf61 DS |
397 | static int acpi_ec_query(struct acpi_ec *ec, u32 * data) |
398 | { | |
399 | int result; | |
d7a76e4c | 400 | u8 d; |
1da177e4 | 401 | |
d7a76e4c LP |
402 | if (!ec || !data) |
403 | return -EINVAL; | |
1da177e4 | 404 | |
d7a76e4c LP |
405 | /* |
406 | * Query the EC to find out which _Qxx method we need to evaluate. | |
407 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
408 | * bit to be cleared (and thus clearing the interrupt source). | |
409 | */ | |
716e084e | 410 | |
d7a76e4c LP |
411 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
412 | if (result) | |
413 | return result; | |
1da177e4 | 414 | |
d7a76e4c LP |
415 | if (!d) |
416 | return -ENODATA; | |
1da177e4 | 417 | |
d7a76e4c LP |
418 | *data = d; |
419 | return 0; | |
1da177e4 LT |
420 | } |
421 | ||
1da177e4 LT |
422 | /* -------------------------------------------------------------------------- |
423 | Event Management | |
424 | -------------------------------------------------------------------------- */ | |
425 | ||
8e0341ba | 426 | struct acpi_ec_query_data { |
50526df6 LB |
427 | acpi_handle handle; |
428 | u8 data; | |
1da177e4 LT |
429 | }; |
430 | ||
50526df6 | 431 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 432 | { |
703959d4 | 433 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
50526df6 | 434 | u32 value = 0; |
50526df6 LB |
435 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; |
436 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
437 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
438 | }; | |
45bea155 | 439 | |
45bea155 LY |
440 | |
441 | if (!ec_cxt) | |
442 | goto end; | |
443 | ||
703959d4 | 444 | value = acpi_ec_read_status(ec); |
45bea155 | 445 | |
45bea155 LY |
446 | if (!(value & ACPI_EC_FLAG_SCI)) |
447 | goto end; | |
448 | ||
449 | if (acpi_ec_query(ec, &value)) | |
450 | goto end; | |
451 | ||
452 | object_name[2] = hex[((value >> 4) & 0x0F)]; | |
453 | object_name[3] = hex[(value & 0x0F)]; | |
454 | ||
8e0341ba | 455 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 456 | |
703959d4 | 457 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 458 | |
50526df6 | 459 | end: |
703959d4 | 460 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
45bea155 | 461 | } |
1da177e4 | 462 | |
50526df6 | 463 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 464 | { |
50526df6 LB |
465 | acpi_status status = AE_OK; |
466 | u32 value; | |
8e0341ba | 467 | u8 exec_mode; |
703959d4 | 468 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 469 | |
703959d4 | 470 | acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 | 471 | value = acpi_ec_read_status(ec); |
1da177e4 | 472 | |
8e0341ba DS |
473 | if (acpi_ec_mode == EC_INTR) { |
474 | if (acpi_ec_check_status(value, ec->expect_event)) { | |
475 | ec->expect_event = 0; | |
476 | wake_up(&ec->wait); | |
477 | } | |
478 | exec_mode = OSL_EC_BURST_HANDLER; | |
479 | } else { | |
480 | exec_mode = OSL_EC_POLL_HANDLER; | |
451566f4 DT |
481 | } |
482 | ||
50526df6 | 483 | if (value & ACPI_EC_FLAG_SCI) { |
8e0341ba | 484 | status = acpi_os_execute(exec_mode, acpi_ec_gpe_query, ec); |
17e9c78a | 485 | return status == AE_OK ? |
50526df6 LB |
486 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
487 | } | |
703959d4 | 488 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 | 489 | return status == AE_OK ? |
50526df6 | 490 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
491 | } |
492 | ||
493 | /* -------------------------------------------------------------------------- | |
494 | Address Space Management | |
495 | -------------------------------------------------------------------------- */ | |
496 | ||
497 | static acpi_status | |
50526df6 LB |
498 | acpi_ec_space_setup(acpi_handle region_handle, |
499 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
500 | { |
501 | /* | |
502 | * The EC object is in the handler context and is needed | |
503 | * when calling the acpi_ec_space_handler. | |
504 | */ | |
50526df6 LB |
505 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
506 | handler_context : NULL; | |
1da177e4 LT |
507 | |
508 | return AE_OK; | |
509 | } | |
510 | ||
1da177e4 | 511 | static acpi_status |
50526df6 LB |
512 | acpi_ec_space_handler(u32 function, |
513 | acpi_physical_address address, | |
514 | u32 bit_width, | |
515 | acpi_integer * value, | |
516 | void *handler_context, void *region_context) | |
1da177e4 | 517 | { |
50526df6 | 518 | int result = 0; |
703959d4 | 519 | struct acpi_ec *ec = NULL; |
50526df6 LB |
520 | u64 temp = *value; |
521 | acpi_integer f_v = 0; | |
522 | int i = 0; | |
1da177e4 | 523 | |
1da177e4 LT |
524 | |
525 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 526 | return AE_BAD_PARAMETER; |
1da177e4 | 527 | |
fa9cd547 | 528 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 529 | return AE_BAD_PARAMETER; |
1da177e4 LT |
530 | } |
531 | ||
703959d4 | 532 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 533 | |
50526df6 | 534 | next_byte: |
1da177e4 LT |
535 | switch (function) { |
536 | case ACPI_READ: | |
fa9cd547 | 537 | temp = 0; |
50526df6 | 538 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
539 | break; |
540 | case ACPI_WRITE: | |
fa9cd547 | 541 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
542 | break; |
543 | default: | |
544 | result = -EINVAL; | |
545 | goto out; | |
546 | break; | |
547 | } | |
548 | ||
549 | bit_width -= 8; | |
fa9cd547 LY |
550 | if (bit_width) { |
551 | if (function == ACPI_READ) | |
552 | f_v |= temp << 8 * i; | |
553 | if (function == ACPI_WRITE) | |
554 | temp >>= 8; | |
1da177e4 | 555 | i++; |
83ea7445 | 556 | address++; |
1da177e4 LT |
557 | goto next_byte; |
558 | } | |
559 | ||
fa9cd547 LY |
560 | if (function == ACPI_READ) { |
561 | f_v |= temp << 8 * i; | |
1da177e4 LT |
562 | *value = f_v; |
563 | } | |
564 | ||
50526df6 | 565 | out: |
1da177e4 LT |
566 | switch (result) { |
567 | case -EINVAL: | |
d550d98d | 568 | return AE_BAD_PARAMETER; |
1da177e4 LT |
569 | break; |
570 | case -ENODEV: | |
d550d98d | 571 | return AE_NOT_FOUND; |
1da177e4 LT |
572 | break; |
573 | case -ETIME: | |
d550d98d | 574 | return AE_TIME; |
1da177e4 LT |
575 | break; |
576 | default: | |
d550d98d | 577 | return AE_OK; |
1da177e4 | 578 | } |
1da177e4 LT |
579 | } |
580 | ||
1da177e4 LT |
581 | /* -------------------------------------------------------------------------- |
582 | FS Interface (/proc) | |
583 | -------------------------------------------------------------------------- */ | |
584 | ||
50526df6 | 585 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 586 | |
50526df6 | 587 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 588 | { |
703959d4 | 589 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 590 | |
1da177e4 LT |
591 | |
592 | if (!ec) | |
593 | goto end; | |
594 | ||
595 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
703959d4 | 596 | (u32) ec->gpe_bit); |
1da177e4 | 597 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
703959d4 DS |
598 | (u32) ec->status_addr.address, |
599 | (u32) ec->data_addr.address); | |
1da177e4 | 600 | seq_printf(seq, "use global lock: %s\n", |
703959d4 DS |
601 | ec->global_lock ? "yes" : "no"); |
602 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 603 | |
50526df6 | 604 | end: |
d550d98d | 605 | return 0; |
1da177e4 LT |
606 | } |
607 | ||
608 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
609 | { | |
610 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
611 | } | |
612 | ||
703959d4 | 613 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
614 | .open = acpi_ec_info_open_fs, |
615 | .read = seq_read, | |
616 | .llseek = seq_lseek, | |
617 | .release = single_release, | |
1da177e4 LT |
618 | .owner = THIS_MODULE, |
619 | }; | |
620 | ||
50526df6 | 621 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 622 | { |
50526df6 | 623 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 624 | |
1da177e4 LT |
625 | |
626 | if (!acpi_device_dir(device)) { | |
627 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 628 | acpi_ec_dir); |
1da177e4 | 629 | if (!acpi_device_dir(device)) |
d550d98d | 630 | return -ENODEV; |
1da177e4 LT |
631 | } |
632 | ||
633 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 634 | acpi_device_dir(device)); |
1da177e4 | 635 | if (!entry) |
d550d98d | 636 | return -ENODEV; |
1da177e4 LT |
637 | else { |
638 | entry->proc_fops = &acpi_ec_info_ops; | |
639 | entry->data = acpi_driver_data(device); | |
640 | entry->owner = THIS_MODULE; | |
641 | } | |
642 | ||
d550d98d | 643 | return 0; |
1da177e4 LT |
644 | } |
645 | ||
50526df6 | 646 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 647 | { |
1da177e4 LT |
648 | |
649 | if (acpi_device_dir(device)) { | |
650 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
651 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
652 | acpi_device_dir(device) = NULL; | |
653 | } | |
654 | ||
d550d98d | 655 | return 0; |
1da177e4 LT |
656 | } |
657 | ||
1da177e4 LT |
658 | /* -------------------------------------------------------------------------- |
659 | Driver Interface | |
660 | -------------------------------------------------------------------------- */ | |
661 | ||
703959d4 | 662 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 663 | { |
50526df6 LB |
664 | int result = 0; |
665 | acpi_status status = AE_OK; | |
703959d4 | 666 | struct acpi_ec *ec = NULL; |
45bea155 | 667 | |
45bea155 LY |
668 | |
669 | if (!device) | |
d550d98d | 670 | return -EINVAL; |
45bea155 | 671 | |
703959d4 | 672 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 673 | if (!ec) |
d550d98d | 674 | return -ENOMEM; |
703959d4 DS |
675 | memset(ec, 0, sizeof(struct acpi_ec)); |
676 | ||
677 | ec->handle = device->handle; | |
678 | ec->uid = -1; | |
679 | init_MUTEX(&ec->sem); | |
680 | if (acpi_ec_mode == EC_INTR) { | |
681 | atomic_set(&ec->leaving_burst, 1); | |
682 | init_waitqueue_head(&ec->wait); | |
45bea155 | 683 | } |
1da177e4 LT |
684 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
685 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
686 | acpi_driver_data(device) = ec; | |
687 | ||
688 | /* Use the global lock for all EC transactions? */ | |
703959d4 DS |
689 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, |
690 | &ec->global_lock); | |
1da177e4 | 691 | |
ff2fc3e9 JS |
692 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
693 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
694 | if (ec_ecdt) { | |
1da177e4 | 695 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
696 | ACPI_ADR_SPACE_EC, |
697 | &acpi_ec_space_handler); | |
451566f4 | 698 | |
703959d4 | 699 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 700 | &acpi_ec_gpe_handler); |
1da177e4 LT |
701 | |
702 | kfree(ec_ecdt); | |
703 | } | |
704 | ||
705 | /* Get GPE bit assignment (EC events). */ | |
706 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 | 707 | status = |
703959d4 DS |
708 | acpi_evaluate_integer(ec->handle, "_GPE", NULL, |
709 | &ec->gpe_bit); | |
1da177e4 | 710 | if (ACPI_FAILURE(status)) { |
703959d4 | 711 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); |
1da177e4 LT |
712 | result = -ENODEV; |
713 | goto end; | |
714 | } | |
715 | ||
716 | result = acpi_ec_add_fs(device); | |
717 | if (result) | |
718 | goto end; | |
719 | ||
703959d4 | 720 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
50526df6 | 721 | acpi_device_name(device), acpi_device_bid(device), |
703959d4 | 722 | (u32) ec->gpe_bit)); |
1da177e4 LT |
723 | |
724 | if (!first_ec) | |
725 | first_ec = device; | |
726 | ||
703959d4 | 727 | end: |
1da177e4 LT |
728 | if (result) |
729 | kfree(ec); | |
730 | ||
d550d98d | 731 | return result; |
1da177e4 LT |
732 | } |
733 | ||
50526df6 | 734 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 735 | { |
703959d4 | 736 | struct acpi_ec *ec = NULL; |
1da177e4 | 737 | |
1da177e4 LT |
738 | |
739 | if (!device) | |
d550d98d | 740 | return -EINVAL; |
1da177e4 LT |
741 | |
742 | ec = acpi_driver_data(device); | |
743 | ||
744 | acpi_ec_remove_fs(device); | |
745 | ||
746 | kfree(ec); | |
747 | ||
d550d98d | 748 | return 0; |
1da177e4 LT |
749 | } |
750 | ||
1da177e4 | 751 | static acpi_status |
50526df6 | 752 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 753 | { |
703959d4 | 754 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 LT |
755 | struct acpi_generic_address *addr; |
756 | ||
50eca3eb | 757 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
758 | return AE_OK; |
759 | } | |
760 | ||
761 | /* | |
762 | * The first address region returned is the data port, and | |
763 | * the second address region returned is the status/command | |
764 | * port. | |
765 | */ | |
703959d4 DS |
766 | if (ec->data_addr.register_bit_width == 0) { |
767 | addr = &ec->data_addr; | |
768 | } else if (ec->command_addr.register_bit_width == 0) { | |
769 | addr = &ec->command_addr; | |
1da177e4 LT |
770 | } else { |
771 | return AE_CTRL_TERMINATE; | |
772 | } | |
773 | ||
774 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
775 | addr->register_bit_width = 8; | |
776 | addr->register_bit_offset = 0; | |
50eca3eb | 777 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
778 | |
779 | return AE_OK; | |
780 | } | |
781 | ||
50526df6 | 782 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 783 | { |
50526df6 | 784 | acpi_status status = AE_OK; |
703959d4 | 785 | struct acpi_ec *ec = NULL; |
1da177e4 | 786 | |
1da177e4 LT |
787 | |
788 | if (!device) | |
d550d98d | 789 | return -EINVAL; |
1da177e4 LT |
790 | |
791 | ec = acpi_driver_data(device); | |
792 | ||
793 | if (!ec) | |
d550d98d | 794 | return -EINVAL; |
1da177e4 LT |
795 | |
796 | /* | |
797 | * Get I/O port addresses. Convert to GAS format. | |
798 | */ | |
703959d4 | 799 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 LB |
800 | acpi_ec_io_ports, ec); |
801 | if (ACPI_FAILURE(status) | |
703959d4 DS |
802 | || ec->command_addr.register_bit_width == 0) { |
803 | ACPI_EXCEPTION((AE_INFO, status, | |
804 | "Error getting I/O port addresses")); | |
d550d98d | 805 | return -ENODEV; |
1da177e4 LT |
806 | } |
807 | ||
703959d4 | 808 | ec->status_addr = ec->command_addr; |
1da177e4 | 809 | |
703959d4 DS |
810 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x", |
811 | (u32) ec->gpe_bit, | |
812 | (u32) ec->command_addr.address, | |
813 | (u32) ec->data_addr.address)); | |
1da177e4 LT |
814 | |
815 | /* | |
816 | * Install GPE handler | |
817 | */ | |
703959d4 | 818 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, |
50526df6 LB |
819 | ACPI_GPE_EDGE_TRIGGERED, |
820 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 821 | if (ACPI_FAILURE(status)) { |
d550d98d | 822 | return -ENODEV; |
1da177e4 | 823 | } |
703959d4 DS |
824 | acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
825 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 826 | |
703959d4 | 827 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
828 | ACPI_ADR_SPACE_EC, |
829 | &acpi_ec_space_handler, | |
830 | &acpi_ec_space_setup, ec); | |
1da177e4 | 831 | if (ACPI_FAILURE(status)) { |
703959d4 | 832 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 833 | &acpi_ec_gpe_handler); |
d550d98d | 834 | return -ENODEV; |
1da177e4 LT |
835 | } |
836 | ||
d550d98d | 837 | return AE_OK; |
1da177e4 LT |
838 | } |
839 | ||
50526df6 | 840 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 841 | { |
50526df6 | 842 | acpi_status status = AE_OK; |
703959d4 | 843 | struct acpi_ec *ec = NULL; |
1da177e4 | 844 | |
1da177e4 LT |
845 | |
846 | if (!device) | |
d550d98d | 847 | return -EINVAL; |
1da177e4 LT |
848 | |
849 | ec = acpi_driver_data(device); | |
850 | ||
703959d4 | 851 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
852 | ACPI_ADR_SPACE_EC, |
853 | &acpi_ec_space_handler); | |
1da177e4 | 854 | if (ACPI_FAILURE(status)) |
d550d98d | 855 | return -ENODEV; |
1da177e4 | 856 | |
50526df6 | 857 | status = |
703959d4 | 858 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, |
50526df6 | 859 | &acpi_ec_gpe_handler); |
1da177e4 | 860 | if (ACPI_FAILURE(status)) |
d550d98d | 861 | return -ENODEV; |
1da177e4 | 862 | |
d550d98d | 863 | return 0; |
1da177e4 LT |
864 | } |
865 | ||
866 | static acpi_status __init | |
50526df6 LB |
867 | acpi_fake_ecdt_callback(acpi_handle handle, |
868 | u32 Level, void *context, void **retval) | |
1da177e4 | 869 | { |
50526df6 | 870 | acpi_status status; |
1da177e4 | 871 | |
703959d4 DS |
872 | init_MUTEX(&ec_ecdt->sem); |
873 | if (acpi_ec_mode == EC_INTR) { | |
874 | init_waitqueue_head(&ec_ecdt->wait); | |
875 | } | |
1da177e4 | 876 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 877 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
878 | if (ACPI_FAILURE(status)) |
879 | return status; | |
703959d4 | 880 | ec_ecdt->status_addr = ec_ecdt->command_addr; |
1da177e4 | 881 | |
703959d4 DS |
882 | ec_ecdt->uid = -1; |
883 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 884 | |
50526df6 LB |
885 | status = |
886 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
703959d4 | 887 | &ec_ecdt->gpe_bit); |
1da177e4 LT |
888 | if (ACPI_FAILURE(status)) |
889 | return status; | |
703959d4 DS |
890 | ec_ecdt->global_lock = TRUE; |
891 | ec_ecdt->handle = handle; | |
1da177e4 | 892 | |
703959d4 DS |
893 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02x, ports=0x%2x, 0x%2x", |
894 | (u32) ec_ecdt->gpe_bit, | |
895 | (u32) ec_ecdt->command_addr.address, | |
896 | (u32) ec_ecdt->data_addr.address)); | |
1da177e4 LT |
897 | |
898 | return AE_CTRL_TERMINATE; | |
899 | } | |
900 | ||
901 | /* | |
902 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
903 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
904 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
905 | * required, but if EC regison is accessed early, it is required. | |
906 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
907 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
908 | * op region (since _REG isn't invoked yet). The assumption is true for | |
909 | * all systems found. | |
910 | */ | |
50526df6 | 911 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 912 | { |
50526df6 LB |
913 | acpi_status status; |
914 | int ret = 0; | |
1da177e4 | 915 | |
703959d4 | 916 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 917 | |
703959d4 | 918 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
919 | if (!ec_ecdt) { |
920 | ret = -ENOMEM; | |
921 | goto error; | |
922 | } | |
703959d4 | 923 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
1da177e4 | 924 | |
50526df6 LB |
925 | status = acpi_get_devices(ACPI_EC_HID, |
926 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
927 | if (ACPI_FAILURE(status)) { |
928 | kfree(ec_ecdt); | |
929 | ec_ecdt = NULL; | |
930 | ret = -ENODEV; | |
703959d4 | 931 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
932 | goto error; |
933 | } | |
934 | return 0; | |
703959d4 | 935 | error: |
1da177e4 LT |
936 | return ret; |
937 | } | |
938 | ||
50526df6 | 939 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 940 | { |
50526df6 LB |
941 | acpi_status status; |
942 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 943 | |
50526df6 LB |
944 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
945 | (struct acpi_table_header **) | |
946 | &ecdt_ptr); | |
45bea155 LY |
947 | if (ACPI_FAILURE(status)) |
948 | return -ENODEV; | |
949 | ||
703959d4 | 950 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
951 | |
952 | /* | |
953 | * Generate a temporary ec context to use until the namespace is scanned | |
954 | */ | |
703959d4 | 955 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
956 | if (!ec_ecdt) |
957 | return -ENOMEM; | |
703959d4 | 958 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
45bea155 | 959 | |
703959d4 DS |
960 | init_MUTEX(&ec_ecdt->sem); |
961 | if (acpi_ec_mode == EC_INTR) { | |
962 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 963 | } |
703959d4 DS |
964 | ec_ecdt->command_addr = ecdt_ptr->ec_control; |
965 | ec_ecdt->status_addr = ecdt_ptr->ec_control; | |
966 | ec_ecdt->data_addr = ecdt_ptr->ec_data; | |
967 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 968 | /* use the GL just to be safe */ |
703959d4 DS |
969 | ec_ecdt->global_lock = TRUE; |
970 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 971 | |
50526df6 | 972 | status = |
703959d4 | 973 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
1da177e4 LT |
974 | if (ACPI_FAILURE(status)) { |
975 | goto error; | |
976 | } | |
977 | ||
978 | return 0; | |
703959d4 DS |
979 | error: |
980 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); | |
1da177e4 LT |
981 | kfree(ec_ecdt); |
982 | ec_ecdt = NULL; | |
983 | ||
984 | return -ENODEV; | |
985 | } | |
986 | ||
987 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 988 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 989 | { |
50526df6 LB |
990 | acpi_status status; |
991 | int ret; | |
1da177e4 LT |
992 | |
993 | ret = acpi_ec_get_real_ecdt(); | |
994 | /* Try to make a fake ECDT */ | |
995 | if (ret && acpi_fake_ecdt_enabled) { | |
996 | ret = acpi_ec_fake_ecdt(); | |
997 | } | |
998 | ||
999 | if (ret) | |
1000 | return 0; | |
1001 | ||
1002 | /* | |
1003 | * Install GPE handler | |
1004 | */ | |
703959d4 | 1005 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 LB |
1006 | ACPI_GPE_EDGE_TRIGGERED, |
1007 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1008 | if (ACPI_FAILURE(status)) { |
1009 | goto error; | |
1010 | } | |
703959d4 DS |
1011 | acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1012 | acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
50526df6 LB |
1013 | |
1014 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1015 | ACPI_ADR_SPACE_EC, | |
1016 | &acpi_ec_space_handler, | |
1017 | &acpi_ec_space_setup, | |
1018 | ec_ecdt); | |
1da177e4 | 1019 | if (ACPI_FAILURE(status)) { |
703959d4 | 1020 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
50526df6 | 1021 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1022 | goto error; |
1023 | } | |
1024 | ||
1025 | return 0; | |
1026 | ||
50526df6 | 1027 | error: |
703959d4 | 1028 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
1029 | kfree(ec_ecdt); |
1030 | ec_ecdt = NULL; | |
1031 | ||
1032 | return -ENODEV; | |
1033 | } | |
1034 | ||
50526df6 | 1035 | static int __init acpi_ec_init(void) |
1da177e4 | 1036 | { |
50526df6 | 1037 | int result = 0; |
1da177e4 | 1038 | |
1da177e4 LT |
1039 | |
1040 | if (acpi_disabled) | |
d550d98d | 1041 | return 0; |
1da177e4 LT |
1042 | |
1043 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1044 | if (!acpi_ec_dir) | |
d550d98d | 1045 | return -ENODEV; |
1da177e4 LT |
1046 | |
1047 | /* Now register the driver for the EC */ | |
1048 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1049 | if (result < 0) { | |
1050 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1051 | return -ENODEV; |
1da177e4 LT |
1052 | } |
1053 | ||
d550d98d | 1054 | return result; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | subsys_initcall(acpi_ec_init); | |
1058 | ||
1059 | /* EC driver currently not unloadable */ | |
1060 | #if 0 | |
50526df6 | 1061 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1062 | { |
1da177e4 LT |
1063 | |
1064 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1065 | ||
1066 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1067 | ||
d550d98d | 1068 | return; |
1da177e4 | 1069 | } |
50526df6 | 1070 | #endif /* 0 */ |
1da177e4 LT |
1071 | |
1072 | static int __init acpi_fake_ecdt_setup(char *str) | |
1073 | { | |
1074 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1075 | return 1; |
1da177e4 | 1076 | } |
7b15f5e7 | 1077 | |
1da177e4 | 1078 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1079 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1080 | { |
02b28a33 | 1081 | int intr; |
7b15f5e7 | 1082 | |
02b28a33 | 1083 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1084 | return 0; |
1085 | ||
02b28a33 | 1086 | if (intr) { |
703959d4 | 1087 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1088 | } else { |
703959d4 | 1089 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1090 | } |
703959d4 DS |
1091 | acpi_ec_driver.ops.add = acpi_ec_add; |
1092 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); | |
1093 | ||
9b41046c | 1094 | return 1; |
45bea155 | 1095 | } |
50526df6 | 1096 | |
53f11d4f | 1097 | __setup("ec_intr=", acpi_ec_set_intr_mode); |