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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 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 DS |
73 | |
74 | enum { | |
75 | EC_INTR = 1, /* Output buffer full */ | |
6ffb221a | 76 | EC_POLL, /* Input buffer empty */ |
703959d4 DS |
77 | }; |
78 | ||
50526df6 LB |
79 | static int acpi_ec_remove(struct acpi_device *device, int type); |
80 | static int acpi_ec_start(struct acpi_device *device); | |
81 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 82 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
83 | |
84 | static struct acpi_driver acpi_ec_driver = { | |
50526df6 LB |
85 | .name = ACPI_EC_DRIVER_NAME, |
86 | .class = ACPI_EC_CLASS, | |
87 | .ids = ACPI_EC_HID, | |
88 | .ops = { | |
703959d4 | 89 | .add = acpi_ec_add, |
50526df6 LB |
90 | .remove = acpi_ec_remove, |
91 | .start = acpi_ec_start, | |
92 | .stop = acpi_ec_stop, | |
93 | }, | |
1da177e4 | 94 | }; |
6ffb221a DS |
95 | |
96 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
703959d4 DS |
97 | struct acpi_ec { |
98 | acpi_handle handle; | |
99 | unsigned long uid; | |
a86e2772 | 100 | unsigned long gpe; |
6ffb221a DS |
101 | unsigned long command_addr; |
102 | unsigned long data_addr; | |
703959d4 | 103 | unsigned long global_lock; |
c787a855 | 104 | struct mutex lock; |
5d0c288b | 105 | atomic_t query_pending; |
703959d4 DS |
106 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ |
107 | wait_queue_head_t wait; | |
6ffb221a | 108 | } *ec_ecdt; |
703959d4 DS |
109 | |
110 | /* External interfaces use first EC only, so remember */ | |
111 | static struct acpi_device *first_ec; | |
112 | static int acpi_ec_mode = EC_INTR; | |
113 | ||
1da177e4 LT |
114 | /* -------------------------------------------------------------------------- |
115 | Transaction Management | |
116 | -------------------------------------------------------------------------- */ | |
117 | ||
6ffb221a | 118 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 119 | { |
6ffb221a | 120 | return inb(ec->command_addr); |
451566f4 DT |
121 | } |
122 | ||
6ffb221a | 123 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 124 | { |
6ffb221a | 125 | return inb(ec->data_addr); |
7c6db5e5 DS |
126 | } |
127 | ||
6ffb221a | 128 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 129 | { |
6ffb221a | 130 | outb(command, ec->command_addr); |
45bea155 LY |
131 | } |
132 | ||
6ffb221a | 133 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 134 | { |
6ffb221a | 135 | outb(data, ec->data_addr); |
703959d4 | 136 | } |
45bea155 | 137 | |
bec5a1e0 | 138 | static int acpi_ec_check_status(struct acpi_ec *ec, u8 event) |
6ffb221a | 139 | { |
bec5a1e0 | 140 | u8 status = acpi_ec_read_status(ec); |
45bea155 | 141 | switch (event) { |
703959d4 DS |
142 | case ACPI_EC_EVENT_OBF_1: |
143 | if (status & ACPI_EC_FLAG_OBF) | |
144 | return 1; | |
45bea155 | 145 | break; |
703959d4 DS |
146 | case ACPI_EC_EVENT_IBF_0: |
147 | if (!(status & ACPI_EC_FLAG_IBF)) | |
148 | return 1; | |
45bea155 LY |
149 | break; |
150 | default: | |
703959d4 | 151 | break; |
45bea155 LY |
152 | } |
153 | ||
703959d4 | 154 | return 0; |
45bea155 | 155 | } |
451566f4 | 156 | |
703959d4 | 157 | static int acpi_ec_wait(struct acpi_ec *ec, u8 event) |
7c6db5e5 | 158 | { |
af3fd140 | 159 | if (acpi_ec_mode == EC_POLL) { |
50c1e113 AS |
160 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
161 | while (time_before(jiffies, delay)) { | |
af3fd140 | 162 | if (acpi_ec_check_status(ec, event)) |
7c6db5e5 DS |
163 | return 0; |
164 | } | |
af3fd140 AS |
165 | } else { |
166 | if (wait_event_timeout(ec->wait, | |
167 | acpi_ec_check_status(ec, event), | |
168 | msecs_to_jiffies(ACPI_EC_DELAY)) || | |
169 | acpi_ec_check_status(ec, event)) { | |
703959d4 | 170 | return 0; |
af3fd140 AS |
171 | } else { |
172 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
173 | " status = %d, expect_event = %d\n", | |
174 | acpi_ec_read_status(ec), event); | |
703959d4 | 175 | } |
af3fd140 | 176 | } |
1da177e4 | 177 | |
d550d98d | 178 | return -ETIME; |
1da177e4 LT |
179 | } |
180 | ||
02b28a33 | 181 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
182 | /* |
183 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
184 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
185 | */ | |
703959d4 | 186 | int acpi_ec_enter_burst_mode(struct acpi_ec *ec) |
451566f4 | 187 | { |
6ffb221a DS |
188 | u8 tmp = 0; |
189 | u8 status = 0; | |
451566f4 | 190 | |
451566f4 DT |
191 | |
192 | status = acpi_ec_read_status(ec); | |
50526df6 | 193 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
703959d4 | 194 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
50526df6 | 195 | if (status) |
716e084e | 196 | goto end; |
703959d4 DS |
197 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE); |
198 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); | |
199 | tmp = acpi_ec_read_data(ec); | |
50526df6 | 200 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 201 | return -EINVAL; |
451566f4 | 202 | } |
668d74c0 LY |
203 | } |
204 | ||
703959d4 | 205 | atomic_set(&ec->leaving_burst, 0); |
d550d98d | 206 | return 0; |
703959d4 DS |
207 | end: |
208 | ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode")); | |
d550d98d | 209 | return -1; |
451566f4 DT |
210 | } |
211 | ||
703959d4 | 212 | int acpi_ec_leave_burst_mode(struct acpi_ec *ec) |
451566f4 | 213 | { |
6ffb221a | 214 | u8 status = 0; |
451566f4 | 215 | |
451566f4 | 216 | |
06a2a385 LY |
217 | status = acpi_ec_read_status(ec); |
218 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
703959d4 | 219 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
06a2a385 LY |
220 | if(status) |
221 | goto end; | |
703959d4 DS |
222 | acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE); |
223 | acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); | |
7c6db5e5 | 224 | } |
703959d4 | 225 | atomic_set(&ec->leaving_burst, 1); |
d550d98d | 226 | return 0; |
703959d4 DS |
227 | end: |
228 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode")); | |
d550d98d | 229 | return -1; |
451566f4 | 230 | } |
02b28a33 | 231 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 232 | |
703959d4 | 233 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
3576cf61 DS |
234 | const u8 *wdata, unsigned wdata_len, |
235 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 236 | { |
af3fd140 | 237 | int result = 0; |
45bea155 | 238 | |
703959d4 | 239 | acpi_ec_write_cmd(ec, command); |
45bea155 | 240 | |
7c6db5e5 | 241 | for (; wdata_len > 0; wdata_len --) { |
703959d4 | 242 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 AS |
243 | if (result) { |
244 | printk(KERN_ERR PREFIX "write_cmd timeout, command = %d\n", | |
245 | command); | |
246 | goto end; | |
247 | } | |
703959d4 | 248 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 249 | } |
45bea155 | 250 | |
d91df1aa | 251 | if (!rdata_len) { |
703959d4 | 252 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
af3fd140 AS |
253 | if (result) { |
254 | printk(KERN_ERR PREFIX "finish-write timeout, command = %d\n", | |
255 | command); | |
256 | goto end; | |
257 | } | |
5d0c288b AS |
258 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
259 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 260 | } |
45bea155 | 261 | |
7c6db5e5 | 262 | for (; rdata_len > 0; rdata_len --) { |
703959d4 | 263 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1); |
af3fd140 AS |
264 | if (result) { |
265 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
266 | command); | |
267 | goto end; | |
268 | } | |
50526df6 | 269 | |
6ffb221a | 270 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 271 | } |
af3fd140 AS |
272 | end: |
273 | return result; | |
45bea155 LY |
274 | } |
275 | ||
3576cf61 DS |
276 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
277 | const u8 *wdata, unsigned wdata_len, | |
278 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 279 | { |
d7a76e4c | 280 | int status; |
50526df6 | 281 | u32 glk; |
1da177e4 | 282 | |
d7a76e4c | 283 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 284 | return -EINVAL; |
1da177e4 | 285 | |
d7a76e4c LP |
286 | if (rdata) |
287 | memset(rdata, 0, rdata_len); | |
1da177e4 | 288 | |
523953b4 | 289 | mutex_lock(&ec->lock); |
703959d4 | 290 | if (ec->global_lock) { |
1da177e4 LT |
291 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
292 | if (ACPI_FAILURE(status)) | |
d550d98d | 293 | return -ENODEV; |
1da177e4 | 294 | } |
451566f4 | 295 | |
5d57a6a5 | 296 | /* Make sure GPE is enabled before doing transaction */ |
a86e2772 | 297 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
5d57a6a5 | 298 | |
703959d4 | 299 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0); |
716e084e | 300 | if (status) { |
3576cf61 | 301 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 302 | goto end; |
716e084e | 303 | } |
1da177e4 | 304 | |
d7a76e4c LP |
305 | status = acpi_ec_transaction_unlocked(ec, command, |
306 | wdata, wdata_len, | |
307 | rdata, rdata_len); | |
1da177e4 | 308 | |
d7a76e4c | 309 | end: |
1da177e4 | 310 | |
703959d4 | 311 | if (ec->global_lock) |
1da177e4 | 312 | acpi_release_global_lock(glk); |
523953b4 | 313 | mutex_unlock(&ec->lock); |
1da177e4 | 314 | |
d550d98d | 315 | return status; |
1da177e4 LT |
316 | } |
317 | ||
6ffb221a | 318 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
319 | { |
320 | int result; | |
321 | u8 d; | |
322 | ||
323 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
324 | &address, 1, &d, 1); | |
325 | *data = d; | |
326 | return result; | |
327 | } | |
6ffb221a | 328 | |
3576cf61 DS |
329 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
330 | { | |
331 | u8 wdata[2] = { address, data }; | |
332 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
333 | wdata, 2, NULL, 0); | |
334 | } | |
335 | ||
1da177e4 LT |
336 | /* |
337 | * Externally callable EC access functions. For now, assume 1 EC only | |
338 | */ | |
6ffb221a | 339 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 340 | { |
703959d4 | 341 | struct acpi_ec *ec; |
1da177e4 | 342 | int err; |
6ffb221a | 343 | u8 temp_data; |
1da177e4 LT |
344 | |
345 | if (!first_ec) | |
346 | return -ENODEV; | |
347 | ||
348 | ec = acpi_driver_data(first_ec); | |
349 | ||
350 | err = acpi_ec_read(ec, addr, &temp_data); | |
351 | ||
352 | if (!err) { | |
353 | *val = temp_data; | |
354 | return 0; | |
50526df6 | 355 | } else |
1da177e4 LT |
356 | return err; |
357 | } | |
50526df6 | 358 | |
1da177e4 LT |
359 | EXPORT_SYMBOL(ec_read); |
360 | ||
50526df6 | 361 | int ec_write(u8 addr, u8 val) |
1da177e4 | 362 | { |
703959d4 | 363 | struct acpi_ec *ec; |
1da177e4 LT |
364 | int err; |
365 | ||
366 | if (!first_ec) | |
367 | return -ENODEV; | |
368 | ||
369 | ec = acpi_driver_data(first_ec); | |
370 | ||
371 | err = acpi_ec_write(ec, addr, val); | |
372 | ||
373 | return err; | |
374 | } | |
50526df6 | 375 | |
1da177e4 LT |
376 | EXPORT_SYMBOL(ec_write); |
377 | ||
d7a76e4c LP |
378 | extern int ec_transaction(u8 command, |
379 | const u8 *wdata, unsigned wdata_len, | |
380 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 381 | { |
703959d4 | 382 | struct acpi_ec *ec; |
45bea155 | 383 | |
d7a76e4c LP |
384 | if (!first_ec) |
385 | return -ENODEV; | |
45bea155 | 386 | |
d7a76e4c | 387 | ec = acpi_driver_data(first_ec); |
45bea155 | 388 | |
3576cf61 DS |
389 | return acpi_ec_transaction(ec, command, wdata, |
390 | wdata_len, rdata, rdata_len); | |
45bea155 | 391 | } |
1da177e4 | 392 | |
ab9e43c6 LP |
393 | EXPORT_SYMBOL(ec_transaction); |
394 | ||
6ffb221a | 395 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
3576cf61 DS |
396 | { |
397 | int result; | |
d7a76e4c | 398 | u8 d; |
1da177e4 | 399 | |
d7a76e4c LP |
400 | if (!ec || !data) |
401 | return -EINVAL; | |
1da177e4 | 402 | |
d7a76e4c LP |
403 | /* |
404 | * Query the EC to find out which _Qxx method we need to evaluate. | |
405 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
406 | * bit to be cleared (and thus clearing the interrupt source). | |
407 | */ | |
716e084e | 408 | |
d7a76e4c LP |
409 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
410 | if (result) | |
411 | return result; | |
1da177e4 | 412 | |
d7a76e4c LP |
413 | if (!d) |
414 | return -ENODATA; | |
1da177e4 | 415 | |
d7a76e4c LP |
416 | *data = d; |
417 | return 0; | |
1da177e4 LT |
418 | } |
419 | ||
1da177e4 LT |
420 | /* -------------------------------------------------------------------------- |
421 | Event Management | |
422 | -------------------------------------------------------------------------- */ | |
423 | ||
50526df6 | 424 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 425 | { |
703959d4 | 426 | struct acpi_ec *ec = (struct acpi_ec *)ec_cxt; |
6ffb221a | 427 | u8 value = 0; |
5d0c288b | 428 | char object_name[8]; |
45bea155 | 429 | |
5d0c288b | 430 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 431 | return; |
45bea155 | 432 | |
6ffb221a | 433 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 434 | |
af3fd140 | 435 | printk(KERN_INFO PREFIX "evaluating %s\n", object_name); |
45bea155 | 436 | |
703959d4 | 437 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 438 | } |
1da177e4 | 439 | |
50526df6 | 440 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 441 | { |
50526df6 | 442 | acpi_status status = AE_OK; |
6ffb221a | 443 | u8 value; |
703959d4 | 444 | struct acpi_ec *ec = (struct acpi_ec *)data; |
1da177e4 | 445 | |
1da177e4 | 446 | |
8e0341ba | 447 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 448 | wake_up(&ec->wait); |
451566f4 DT |
449 | } |
450 | ||
bec5a1e0 | 451 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
452 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
453 | atomic_set(&ec->query_pending, 1); | |
6ffb221a | 454 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); |
50526df6 | 455 | } |
e41334c0 | 456 | |
451566f4 | 457 | return status == AE_OK ? |
50526df6 | 458 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
459 | } |
460 | ||
461 | /* -------------------------------------------------------------------------- | |
462 | Address Space Management | |
463 | -------------------------------------------------------------------------- */ | |
464 | ||
465 | static acpi_status | |
50526df6 LB |
466 | acpi_ec_space_setup(acpi_handle region_handle, |
467 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
468 | { |
469 | /* | |
470 | * The EC object is in the handler context and is needed | |
471 | * when calling the acpi_ec_space_handler. | |
472 | */ | |
50526df6 LB |
473 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
474 | handler_context : NULL; | |
1da177e4 LT |
475 | |
476 | return AE_OK; | |
477 | } | |
478 | ||
1da177e4 | 479 | static acpi_status |
50526df6 LB |
480 | acpi_ec_space_handler(u32 function, |
481 | acpi_physical_address address, | |
482 | u32 bit_width, | |
483 | acpi_integer * value, | |
484 | void *handler_context, void *region_context) | |
1da177e4 | 485 | { |
50526df6 | 486 | int result = 0; |
703959d4 | 487 | struct acpi_ec *ec = NULL; |
50526df6 LB |
488 | u64 temp = *value; |
489 | acpi_integer f_v = 0; | |
490 | int i = 0; | |
1da177e4 | 491 | |
1da177e4 LT |
492 | |
493 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 494 | return AE_BAD_PARAMETER; |
1da177e4 | 495 | |
fa9cd547 | 496 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 497 | return AE_BAD_PARAMETER; |
1da177e4 LT |
498 | } |
499 | ||
703959d4 | 500 | ec = (struct acpi_ec *)handler_context; |
1da177e4 | 501 | |
50526df6 | 502 | next_byte: |
1da177e4 LT |
503 | switch (function) { |
504 | case ACPI_READ: | |
fa9cd547 | 505 | temp = 0; |
6ffb221a | 506 | result = acpi_ec_read(ec, (u8) address, (u8 *) &temp); |
1da177e4 LT |
507 | break; |
508 | case ACPI_WRITE: | |
fa9cd547 | 509 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
510 | break; |
511 | default: | |
512 | result = -EINVAL; | |
513 | goto out; | |
514 | break; | |
515 | } | |
516 | ||
517 | bit_width -= 8; | |
fa9cd547 LY |
518 | if (bit_width) { |
519 | if (function == ACPI_READ) | |
520 | f_v |= temp << 8 * i; | |
521 | if (function == ACPI_WRITE) | |
522 | temp >>= 8; | |
1da177e4 | 523 | i++; |
83ea7445 | 524 | address++; |
1da177e4 LT |
525 | goto next_byte; |
526 | } | |
527 | ||
fa9cd547 LY |
528 | if (function == ACPI_READ) { |
529 | f_v |= temp << 8 * i; | |
1da177e4 LT |
530 | *value = f_v; |
531 | } | |
532 | ||
50526df6 | 533 | out: |
1da177e4 LT |
534 | switch (result) { |
535 | case -EINVAL: | |
d550d98d | 536 | return AE_BAD_PARAMETER; |
1da177e4 LT |
537 | break; |
538 | case -ENODEV: | |
d550d98d | 539 | return AE_NOT_FOUND; |
1da177e4 LT |
540 | break; |
541 | case -ETIME: | |
d550d98d | 542 | return AE_TIME; |
1da177e4 LT |
543 | break; |
544 | default: | |
d550d98d | 545 | return AE_OK; |
1da177e4 | 546 | } |
1da177e4 LT |
547 | } |
548 | ||
1da177e4 LT |
549 | /* -------------------------------------------------------------------------- |
550 | FS Interface (/proc) | |
551 | -------------------------------------------------------------------------- */ | |
552 | ||
50526df6 | 553 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 554 | |
50526df6 | 555 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 556 | { |
703959d4 | 557 | struct acpi_ec *ec = (struct acpi_ec *)seq->private; |
1da177e4 | 558 | |
1da177e4 LT |
559 | |
560 | if (!ec) | |
561 | goto end; | |
562 | ||
a86e2772 AS |
563 | seq_printf(seq, "gpe: 0x%02x\n", |
564 | (u32) ec->gpe); | |
1da177e4 | 565 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ffb221a DS |
566 | (u32) ec->command_addr, |
567 | (u32) ec->data_addr); | |
1da177e4 | 568 | seq_printf(seq, "use global lock: %s\n", |
703959d4 | 569 | ec->global_lock ? "yes" : "no"); |
a86e2772 | 570 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
1da177e4 | 571 | |
50526df6 | 572 | end: |
d550d98d | 573 | return 0; |
1da177e4 LT |
574 | } |
575 | ||
576 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
577 | { | |
578 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
579 | } | |
580 | ||
703959d4 | 581 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
582 | .open = acpi_ec_info_open_fs, |
583 | .read = seq_read, | |
584 | .llseek = seq_lseek, | |
585 | .release = single_release, | |
1da177e4 LT |
586 | .owner = THIS_MODULE, |
587 | }; | |
588 | ||
50526df6 | 589 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 590 | { |
50526df6 | 591 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 592 | |
1da177e4 LT |
593 | |
594 | if (!acpi_device_dir(device)) { | |
595 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 596 | acpi_ec_dir); |
1da177e4 | 597 | if (!acpi_device_dir(device)) |
d550d98d | 598 | return -ENODEV; |
1da177e4 LT |
599 | } |
600 | ||
601 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 602 | acpi_device_dir(device)); |
1da177e4 | 603 | if (!entry) |
d550d98d | 604 | return -ENODEV; |
1da177e4 LT |
605 | else { |
606 | entry->proc_fops = &acpi_ec_info_ops; | |
607 | entry->data = acpi_driver_data(device); | |
608 | entry->owner = THIS_MODULE; | |
609 | } | |
610 | ||
d550d98d | 611 | return 0; |
1da177e4 LT |
612 | } |
613 | ||
50526df6 | 614 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 615 | { |
1da177e4 LT |
616 | |
617 | if (acpi_device_dir(device)) { | |
618 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
619 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
620 | acpi_device_dir(device) = NULL; | |
621 | } | |
622 | ||
d550d98d | 623 | return 0; |
1da177e4 LT |
624 | } |
625 | ||
1da177e4 LT |
626 | /* -------------------------------------------------------------------------- |
627 | Driver Interface | |
628 | -------------------------------------------------------------------------- */ | |
629 | ||
703959d4 | 630 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 631 | { |
50526df6 LB |
632 | int result = 0; |
633 | acpi_status status = AE_OK; | |
703959d4 | 634 | struct acpi_ec *ec = NULL; |
45bea155 | 635 | |
45bea155 LY |
636 | |
637 | if (!device) | |
d550d98d | 638 | return -EINVAL; |
45bea155 | 639 | |
703959d4 | 640 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 | 641 | if (!ec) |
d550d98d | 642 | return -ENOMEM; |
703959d4 DS |
643 | memset(ec, 0, sizeof(struct acpi_ec)); |
644 | ||
645 | ec->handle = device->handle; | |
646 | ec->uid = -1; | |
c787a855 | 647 | mutex_init(&ec->lock); |
5d0c288b | 648 | atomic_set(&ec->query_pending, 0); |
703959d4 DS |
649 | if (acpi_ec_mode == EC_INTR) { |
650 | atomic_set(&ec->leaving_burst, 1); | |
651 | init_waitqueue_head(&ec->wait); | |
45bea155 | 652 | } |
1da177e4 LT |
653 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
654 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
655 | acpi_driver_data(device) = ec; | |
656 | ||
657 | /* Use the global lock for all EC transactions? */ | |
703959d4 DS |
658 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, |
659 | &ec->global_lock); | |
1da177e4 | 660 | |
ff2fc3e9 JS |
661 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
662 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
663 | if (ec_ecdt) { | |
1da177e4 | 664 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
665 | ACPI_ADR_SPACE_EC, |
666 | &acpi_ec_space_handler); | |
451566f4 | 667 | |
a86e2772 | 668 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 669 | &acpi_ec_gpe_handler); |
1da177e4 LT |
670 | |
671 | kfree(ec_ecdt); | |
672 | } | |
673 | ||
674 | /* Get GPE bit assignment (EC events). */ | |
675 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 | 676 | status = |
703959d4 | 677 | acpi_evaluate_integer(ec->handle, "_GPE", NULL, |
a86e2772 | 678 | &ec->gpe); |
1da177e4 | 679 | if (ACPI_FAILURE(status)) { |
703959d4 | 680 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment")); |
1da177e4 LT |
681 | result = -ENODEV; |
682 | goto end; | |
683 | } | |
684 | ||
685 | result = acpi_ec_add_fs(device); | |
686 | if (result) | |
687 | goto end; | |
688 | ||
703959d4 | 689 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
50526df6 | 690 | acpi_device_name(device), acpi_device_bid(device), |
a86e2772 | 691 | (u32) ec->gpe)); |
1da177e4 LT |
692 | |
693 | if (!first_ec) | |
694 | first_ec = device; | |
695 | ||
703959d4 | 696 | end: |
1da177e4 LT |
697 | if (result) |
698 | kfree(ec); | |
699 | ||
d550d98d | 700 | return result; |
1da177e4 LT |
701 | } |
702 | ||
50526df6 | 703 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 704 | { |
703959d4 | 705 | struct acpi_ec *ec = NULL; |
1da177e4 | 706 | |
1da177e4 LT |
707 | |
708 | if (!device) | |
d550d98d | 709 | return -EINVAL; |
1da177e4 LT |
710 | |
711 | ec = acpi_driver_data(device); | |
712 | ||
713 | acpi_ec_remove_fs(device); | |
714 | ||
715 | kfree(ec); | |
716 | ||
d550d98d | 717 | return 0; |
1da177e4 LT |
718 | } |
719 | ||
1da177e4 | 720 | static acpi_status |
50526df6 | 721 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 722 | { |
703959d4 | 723 | struct acpi_ec *ec = (struct acpi_ec *)context; |
1da177e4 | 724 | |
50eca3eb | 725 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
726 | return AE_OK; |
727 | } | |
728 | ||
729 | /* | |
730 | * The first address region returned is the data port, and | |
731 | * the second address region returned is the status/command | |
732 | * port. | |
733 | */ | |
6ffb221a DS |
734 | if (ec->data_addr == 0) { |
735 | ec->data_addr = resource->data.io.minimum; | |
736 | } else if (ec->command_addr == 0) { | |
737 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
738 | } else { |
739 | return AE_CTRL_TERMINATE; | |
740 | } | |
741 | ||
1da177e4 LT |
742 | return AE_OK; |
743 | } | |
744 | ||
50526df6 | 745 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 746 | { |
50526df6 | 747 | acpi_status status = AE_OK; |
703959d4 | 748 | struct acpi_ec *ec = NULL; |
1da177e4 | 749 | |
1da177e4 LT |
750 | |
751 | if (!device) | |
d550d98d | 752 | return -EINVAL; |
1da177e4 LT |
753 | |
754 | ec = acpi_driver_data(device); | |
755 | ||
756 | if (!ec) | |
d550d98d | 757 | return -EINVAL; |
1da177e4 LT |
758 | |
759 | /* | |
760 | * Get I/O port addresses. Convert to GAS format. | |
761 | */ | |
703959d4 | 762 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
50526df6 | 763 | acpi_ec_io_ports, ec); |
6ffb221a | 764 | if (ACPI_FAILURE(status) || ec->command_addr == 0) { |
703959d4 DS |
765 | ACPI_EXCEPTION((AE_INFO, status, |
766 | "Error getting I/O port addresses")); | |
d550d98d | 767 | return -ENODEV; |
1da177e4 LT |
768 | } |
769 | ||
6ffb221a | 770 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
a86e2772 | 771 | ec->gpe, ec->command_addr, ec->data_addr)); |
1da177e4 LT |
772 | |
773 | /* | |
774 | * Install GPE handler | |
775 | */ | |
a86e2772 | 776 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
50526df6 LB |
777 | ACPI_GPE_EDGE_TRIGGERED, |
778 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 779 | if (ACPI_FAILURE(status)) { |
d550d98d | 780 | return -ENODEV; |
1da177e4 | 781 | } |
a86e2772 AS |
782 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
783 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1da177e4 | 784 | |
703959d4 | 785 | status = acpi_install_address_space_handler(ec->handle, |
50526df6 LB |
786 | ACPI_ADR_SPACE_EC, |
787 | &acpi_ec_space_handler, | |
788 | &acpi_ec_space_setup, ec); | |
1da177e4 | 789 | if (ACPI_FAILURE(status)) { |
a86e2772 | 790 | acpi_remove_gpe_handler(NULL, ec->gpe, |
50526df6 | 791 | &acpi_ec_gpe_handler); |
d550d98d | 792 | return -ENODEV; |
1da177e4 LT |
793 | } |
794 | ||
d550d98d | 795 | return AE_OK; |
1da177e4 LT |
796 | } |
797 | ||
50526df6 | 798 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 799 | { |
50526df6 | 800 | acpi_status status = AE_OK; |
703959d4 | 801 | struct acpi_ec *ec = NULL; |
1da177e4 | 802 | |
1da177e4 LT |
803 | |
804 | if (!device) | |
d550d98d | 805 | return -EINVAL; |
1da177e4 LT |
806 | |
807 | ec = acpi_driver_data(device); | |
808 | ||
703959d4 | 809 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
810 | ACPI_ADR_SPACE_EC, |
811 | &acpi_ec_space_handler); | |
1da177e4 | 812 | if (ACPI_FAILURE(status)) |
d550d98d | 813 | return -ENODEV; |
1da177e4 | 814 | |
50526df6 | 815 | status = |
a86e2772 | 816 | acpi_remove_gpe_handler(NULL, ec->gpe, |
50526df6 | 817 | &acpi_ec_gpe_handler); |
1da177e4 | 818 | if (ACPI_FAILURE(status)) |
d550d98d | 819 | return -ENODEV; |
1da177e4 | 820 | |
d550d98d | 821 | return 0; |
1da177e4 LT |
822 | } |
823 | ||
824 | static acpi_status __init | |
50526df6 LB |
825 | acpi_fake_ecdt_callback(acpi_handle handle, |
826 | u32 Level, void *context, void **retval) | |
1da177e4 | 827 | { |
50526df6 | 828 | acpi_status status; |
1da177e4 | 829 | |
c787a855 | 830 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
831 | if (acpi_ec_mode == EC_INTR) { |
832 | init_waitqueue_head(&ec_ecdt->wait); | |
833 | } | |
1da177e4 | 834 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 835 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
836 | if (ACPI_FAILURE(status)) |
837 | return status; | |
1da177e4 | 838 | |
703959d4 DS |
839 | ec_ecdt->uid = -1; |
840 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
1da177e4 | 841 | |
50526df6 LB |
842 | status = |
843 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
a86e2772 | 844 | &ec_ecdt->gpe); |
1da177e4 LT |
845 | if (ACPI_FAILURE(status)) |
846 | return status; | |
703959d4 DS |
847 | ec_ecdt->global_lock = TRUE; |
848 | ec_ecdt->handle = handle; | |
1da177e4 | 849 | |
6ffb221a | 850 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", |
a86e2772 | 851 | ec_ecdt->gpe, ec_ecdt->command_addr, ec_ecdt->data_addr)); |
1da177e4 LT |
852 | |
853 | return AE_CTRL_TERMINATE; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
858 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
859 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
860 | * required, but if EC regison is accessed early, it is required. | |
861 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
862 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
863 | * op region (since _REG isn't invoked yet). The assumption is true for | |
864 | * all systems found. | |
865 | */ | |
50526df6 | 866 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 867 | { |
50526df6 LB |
868 | acpi_status status; |
869 | int ret = 0; | |
1da177e4 | 870 | |
703959d4 | 871 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT")); |
1da177e4 | 872 | |
703959d4 | 873 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
1da177e4 LT |
874 | if (!ec_ecdt) { |
875 | ret = -ENOMEM; | |
876 | goto error; | |
877 | } | |
703959d4 | 878 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
1da177e4 | 879 | |
50526df6 LB |
880 | status = acpi_get_devices(ACPI_EC_HID, |
881 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
882 | if (ACPI_FAILURE(status)) { |
883 | kfree(ec_ecdt); | |
884 | ec_ecdt = NULL; | |
885 | ret = -ENODEV; | |
703959d4 | 886 | ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT")); |
1da177e4 LT |
887 | goto error; |
888 | } | |
889 | return 0; | |
703959d4 | 890 | error: |
1da177e4 LT |
891 | return ret; |
892 | } | |
893 | ||
50526df6 | 894 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 895 | { |
50526df6 LB |
896 | acpi_status status; |
897 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 898 | |
50526df6 LB |
899 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
900 | (struct acpi_table_header **) | |
901 | &ecdt_ptr); | |
45bea155 LY |
902 | if (ACPI_FAILURE(status)) |
903 | return -ENODEV; | |
904 | ||
703959d4 | 905 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 LY |
906 | |
907 | /* | |
908 | * Generate a temporary ec context to use until the namespace is scanned | |
909 | */ | |
703959d4 | 910 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
45bea155 LY |
911 | if (!ec_ecdt) |
912 | return -ENOMEM; | |
703959d4 | 913 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
45bea155 | 914 | |
c787a855 | 915 | mutex_init(&ec_ecdt->lock); |
703959d4 DS |
916 | if (acpi_ec_mode == EC_INTR) { |
917 | init_waitqueue_head(&ec_ecdt->wait); | |
45bea155 | 918 | } |
6ffb221a DS |
919 | ec_ecdt->command_addr = ecdt_ptr->ec_control.address; |
920 | ec_ecdt->data_addr = ecdt_ptr->ec_data.address; | |
a86e2772 | 921 | ec_ecdt->gpe = ecdt_ptr->gpe_bit; |
1da177e4 | 922 | /* use the GL just to be safe */ |
703959d4 DS |
923 | ec_ecdt->global_lock = TRUE; |
924 | ec_ecdt->uid = ecdt_ptr->uid; | |
1da177e4 | 925 | |
50526df6 | 926 | status = |
703959d4 | 927 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
1da177e4 LT |
928 | if (ACPI_FAILURE(status)) { |
929 | goto error; | |
930 | } | |
931 | ||
932 | return 0; | |
703959d4 DS |
933 | error: |
934 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); | |
1da177e4 LT |
935 | kfree(ec_ecdt); |
936 | ec_ecdt = NULL; | |
937 | ||
938 | return -ENODEV; | |
939 | } | |
940 | ||
941 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 942 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 943 | { |
50526df6 LB |
944 | acpi_status status; |
945 | int ret; | |
1da177e4 LT |
946 | |
947 | ret = acpi_ec_get_real_ecdt(); | |
948 | /* Try to make a fake ECDT */ | |
949 | if (ret && acpi_fake_ecdt_enabled) { | |
950 | ret = acpi_ec_fake_ecdt(); | |
951 | } | |
952 | ||
953 | if (ret) | |
954 | return 0; | |
955 | ||
956 | /* | |
957 | * Install GPE handler | |
958 | */ | |
a86e2772 | 959 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 LB |
960 | ACPI_GPE_EDGE_TRIGGERED, |
961 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
962 | if (ACPI_FAILURE(status)) { |
963 | goto error; | |
964 | } | |
a86e2772 AS |
965 | acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME); |
966 | acpi_enable_gpe(NULL, ec_ecdt->gpe, ACPI_NOT_ISR); | |
50526df6 LB |
967 | |
968 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
969 | ACPI_ADR_SPACE_EC, | |
970 | &acpi_ec_space_handler, | |
971 | &acpi_ec_space_setup, | |
972 | ec_ecdt); | |
1da177e4 | 973 | if (ACPI_FAILURE(status)) { |
a86e2772 | 974 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe, |
50526df6 | 975 | &acpi_ec_gpe_handler); |
1da177e4 LT |
976 | goto error; |
977 | } | |
978 | ||
979 | return 0; | |
980 | ||
50526df6 | 981 | error: |
703959d4 | 982 | ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT")); |
1da177e4 LT |
983 | kfree(ec_ecdt); |
984 | ec_ecdt = NULL; | |
985 | ||
986 | return -ENODEV; | |
987 | } | |
988 | ||
50526df6 | 989 | static int __init acpi_ec_init(void) |
1da177e4 | 990 | { |
50526df6 | 991 | int result = 0; |
1da177e4 | 992 | |
1da177e4 LT |
993 | |
994 | if (acpi_disabled) | |
d550d98d | 995 | return 0; |
1da177e4 LT |
996 | |
997 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
998 | if (!acpi_ec_dir) | |
d550d98d | 999 | return -ENODEV; |
1da177e4 LT |
1000 | |
1001 | /* Now register the driver for the EC */ | |
1002 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1003 | if (result < 0) { | |
1004 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1005 | return -ENODEV; |
1da177e4 LT |
1006 | } |
1007 | ||
d550d98d | 1008 | return result; |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | subsys_initcall(acpi_ec_init); | |
1012 | ||
1013 | /* EC driver currently not unloadable */ | |
1014 | #if 0 | |
50526df6 | 1015 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1016 | { |
1da177e4 LT |
1017 | |
1018 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1019 | ||
1020 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1021 | ||
d550d98d | 1022 | return; |
1da177e4 | 1023 | } |
50526df6 | 1024 | #endif /* 0 */ |
1da177e4 LT |
1025 | |
1026 | static int __init acpi_fake_ecdt_setup(char *str) | |
1027 | { | |
1028 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1029 | return 1; |
1da177e4 | 1030 | } |
7b15f5e7 | 1031 | |
1da177e4 | 1032 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1033 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1034 | { |
02b28a33 | 1035 | int intr; |
7b15f5e7 | 1036 | |
02b28a33 | 1037 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1038 | return 0; |
1039 | ||
02b28a33 | 1040 | if (intr) { |
703959d4 | 1041 | acpi_ec_mode = EC_INTR; |
7b15f5e7 | 1042 | } else { |
703959d4 | 1043 | acpi_ec_mode = EC_POLL; |
7b15f5e7 | 1044 | } |
703959d4 DS |
1045 | acpi_ec_driver.ops.add = acpi_ec_add; |
1046 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling")); | |
1047 | ||
9b41046c | 1048 | return 1; |
45bea155 | 1049 | } |
50526df6 | 1050 | |
53f11d4f | 1051 | __setup("ec_intr=", acpi_ec_set_intr_mode); |