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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 | |
41 | ACPI_MODULE_NAME ("acpi_ec") | |
42 | ||
43 | #define ACPI_EC_COMPONENT 0x00100000 | |
44 | #define ACPI_EC_CLASS "embedded_controller" | |
45 | #define ACPI_EC_HID "PNP0C09" | |
46 | #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" | |
47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" | |
48 | #define ACPI_EC_FILE_INFO "info" | |
49 | ||
50 | ||
51 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ | |
52 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 53 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 LT |
54 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
55 | ||
56 | #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */ | |
57 | #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */ | |
58 | ||
451566f4 | 59 | #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ |
1da177e4 LT |
60 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
61 | ||
62 | #define ACPI_EC_COMMAND_READ 0x80 | |
63 | #define ACPI_EC_COMMAND_WRITE 0x81 | |
451566f4 DT |
64 | #define ACPI_EC_BURST_ENABLE 0x82 |
65 | #define ACPI_EC_BURST_DISABLE 0x83 | |
1da177e4 LT |
66 | #define ACPI_EC_COMMAND_QUERY 0x84 |
67 | ||
68 | static int acpi_ec_add (struct acpi_device *device); | |
69 | static int acpi_ec_remove (struct acpi_device *device, int type); | |
70 | static int acpi_ec_start (struct acpi_device *device); | |
71 | static int acpi_ec_stop (struct acpi_device *device, int type); | |
72 | ||
73 | static struct acpi_driver acpi_ec_driver = { | |
74 | .name = ACPI_EC_DRIVER_NAME, | |
75 | .class = ACPI_EC_CLASS, | |
76 | .ids = ACPI_EC_HID, | |
77 | .ops = { | |
78 | .add = acpi_ec_add, | |
79 | .remove = acpi_ec_remove, | |
80 | .start = acpi_ec_start, | |
81 | .stop = acpi_ec_stop, | |
82 | }, | |
83 | }; | |
84 | ||
85 | struct acpi_ec { | |
86 | acpi_handle handle; | |
87 | unsigned long uid; | |
88 | unsigned long gpe_bit; | |
89 | struct acpi_generic_address status_addr; | |
90 | struct acpi_generic_address command_addr; | |
91 | struct acpi_generic_address data_addr; | |
92 | unsigned long global_lock; | |
451566f4 DT |
93 | unsigned int expect_event; |
94 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/ | |
95 | atomic_t pending_gpe; | |
96 | struct semaphore sem; | |
97 | wait_queue_head_t wait; | |
1da177e4 LT |
98 | }; |
99 | ||
100 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
101 | static struct acpi_ec *ec_ecdt; | |
102 | ||
103 | /* External interfaces use first EC only, so remember */ | |
104 | static struct acpi_device *first_ec; | |
105 | ||
106 | /* -------------------------------------------------------------------------- | |
107 | Transaction Management | |
108 | -------------------------------------------------------------------------- */ | |
109 | ||
451566f4 | 110 | static inline u32 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 111 | { |
451566f4 | 112 | u32 status = 0; |
1da177e4 | 113 | |
451566f4 DT |
114 | acpi_hw_low_level_read(8, &status, &ec->status_addr); |
115 | return status; | |
116 | } | |
117 | ||
118 | static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event) | |
119 | { | |
120 | int result = 0; | |
121 | ||
122 | ACPI_FUNCTION_TRACE("acpi_ec_wait"); | |
1da177e4 | 123 | |
451566f4 DT |
124 | ec->expect_event = event; |
125 | smp_mb(); | |
126 | ||
127 | result = wait_event_interruptible_timeout(ec->wait, | |
128 | !ec->expect_event, | |
129 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
130 | ||
131 | ec->expect_event = 0; | |
132 | smp_mb(); | |
133 | ||
134 | if (result < 0){ | |
135 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result)); | |
136 | return_VALUE(result); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Verify that the event in question has actually happened by | |
141 | * querying EC status. Do the check even if operation timed-out | |
142 | * to make sure that we did not miss interrupt. | |
143 | */ | |
1da177e4 LT |
144 | switch (event) { |
145 | case ACPI_EC_EVENT_OBF: | |
451566f4 DT |
146 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
147 | return_VALUE(0); | |
1da177e4 | 148 | break; |
451566f4 | 149 | |
1da177e4 | 150 | case ACPI_EC_EVENT_IBE: |
451566f4 DT |
151 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
152 | return_VALUE(0); | |
1da177e4 | 153 | break; |
1da177e4 LT |
154 | } |
155 | ||
451566f4 | 156 | return_VALUE(-ETIME); |
1da177e4 LT |
157 | } |
158 | ||
159 | ||
451566f4 DT |
160 | |
161 | static int | |
162 | acpi_ec_enter_burst_mode ( | |
163 | struct acpi_ec *ec) | |
164 | { | |
165 | u32 tmp = 0; | |
166 | int status = 0; | |
167 | ||
168 | ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode"); | |
169 | ||
170 | status = acpi_ec_read_status(ec); | |
171 | if (status != -EINVAL && | |
172 | !(status & ACPI_EC_FLAG_BURST)){ | |
173 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n")); | |
174 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); | |
175 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
176 | if (status){ | |
177 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
178 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status)); | |
179 | return_VALUE(-EINVAL); | |
180 | } | |
181 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
182 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
183 | if(tmp != 0x90 ) {/* Burst ACK byte*/ | |
184 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n")); | |
185 | return_VALUE(-EINVAL); | |
186 | } | |
187 | } else | |
188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n")); | |
189 | atomic_set(&ec->leaving_burst , 0); | |
190 | return_VALUE(0); | |
191 | } | |
192 | ||
193 | static int | |
194 | acpi_ec_leave_burst_mode ( | |
195 | struct acpi_ec *ec) | |
196 | { | |
197 | int status =0; | |
198 | ||
199 | ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); | |
200 | ||
201 | atomic_set(&ec->leaving_burst , 1); | |
202 | status = acpi_ec_read_status(ec); | |
203 | if (status != -EINVAL && | |
204 | (status & ACPI_EC_FLAG_BURST)){ | |
205 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); | |
206 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr); | |
207 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
208 | if (status){ | |
209 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n")); | |
211 | return_VALUE(-EINVAL); | |
212 | } | |
213 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
214 | status = acpi_ec_read_status(ec); | |
215 | if (status != -EINVAL && | |
216 | (status & ACPI_EC_FLAG_BURST)) { | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n")); | |
218 | return_VALUE(-EINVAL); | |
219 | } | |
220 | }else | |
221 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n")); | |
222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); | |
223 | ||
224 | return_VALUE(0); | |
225 | } | |
226 | ||
1da177e4 LT |
227 | static int |
228 | acpi_ec_read ( | |
229 | struct acpi_ec *ec, | |
230 | u8 address, | |
231 | u32 *data) | |
232 | { | |
451566f4 DT |
233 | int status = 0; |
234 | u32 glk; | |
1da177e4 LT |
235 | |
236 | ACPI_FUNCTION_TRACE("acpi_ec_read"); | |
237 | ||
238 | if (!ec || !data) | |
239 | return_VALUE(-EINVAL); | |
240 | ||
451566f4 | 241 | retry: |
1da177e4 LT |
242 | *data = 0; |
243 | ||
244 | if (ec->global_lock) { | |
245 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
246 | if (ACPI_FAILURE(status)) | |
247 | return_VALUE(-ENODEV); | |
248 | } | |
451566f4 DT |
249 | |
250 | WARN_ON(in_interrupt()); | |
251 | down(&ec->sem); | |
252 | ||
253 | if(acpi_ec_enter_burst_mode(ec)) | |
254 | goto end; | |
1da177e4 LT |
255 | |
256 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr); | |
451566f4 DT |
257 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
258 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
259 | if (status) { | |
1da177e4 | 260 | goto end; |
451566f4 | 261 | } |
1da177e4 LT |
262 | |
263 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
264 | status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
265 | if (status){ | |
266 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 267 | goto end; |
451566f4 | 268 | } |
1da177e4 LT |
269 | |
270 | acpi_hw_low_level_read(8, data, &ec->data_addr); | |
451566f4 | 271 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 LT |
272 | |
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", | |
274 | *data, address)); | |
451566f4 | 275 | |
1da177e4 | 276 | end: |
451566f4 DT |
277 | acpi_ec_leave_burst_mode(ec); |
278 | up(&ec->sem); | |
1da177e4 LT |
279 | |
280 | if (ec->global_lock) | |
281 | acpi_release_global_lock(glk); | |
282 | ||
451566f4 DT |
283 | if(atomic_read(&ec->leaving_burst) == 2){ |
284 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
17e9c78a | 285 | while(atomic_read(&ec->pending_gpe)){ |
451566f4 DT |
286 | msleep(1); |
287 | } | |
288 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
289 | goto retry; | |
290 | } | |
291 | ||
292 | return_VALUE(status); | |
1da177e4 LT |
293 | } |
294 | ||
295 | ||
296 | static int | |
297 | acpi_ec_write ( | |
298 | struct acpi_ec *ec, | |
299 | u8 address, | |
300 | u8 data) | |
301 | { | |
451566f4 DT |
302 | int status = 0; |
303 | u32 glk; | |
304 | u32 tmp; | |
1da177e4 LT |
305 | |
306 | ACPI_FUNCTION_TRACE("acpi_ec_write"); | |
307 | ||
308 | if (!ec) | |
309 | return_VALUE(-EINVAL); | |
451566f4 | 310 | retry: |
1da177e4 LT |
311 | if (ec->global_lock) { |
312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
313 | if (ACPI_FAILURE(status)) | |
314 | return_VALUE(-ENODEV); | |
315 | } | |
316 | ||
451566f4 DT |
317 | WARN_ON(in_interrupt()); |
318 | down(&ec->sem); | |
319 | ||
320 | if(acpi_ec_enter_burst_mode(ec)) | |
321 | goto end; | |
322 | ||
323 | status = acpi_ec_read_status(ec); | |
324 | if (status != -EINVAL && | |
325 | !(status & ACPI_EC_FLAG_BURST)){ | |
326 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); | |
327 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
328 | if (status) | |
329 | goto end; | |
330 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); | |
331 | if(tmp != 0x90 ) /* Burst ACK byte*/ | |
332 | goto end; | |
333 | } | |
334 | /*Now we are in burst mode*/ | |
1da177e4 LT |
335 | |
336 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr); | |
451566f4 DT |
337 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
338 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
339 | if (status){ | |
1da177e4 | 340 | goto end; |
451566f4 | 341 | } |
1da177e4 LT |
342 | |
343 | acpi_hw_low_level_write(8, address, &ec->data_addr); | |
451566f4 DT |
344 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
345 | if (status){ | |
346 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 347 | goto end; |
451566f4 | 348 | } |
1da177e4 LT |
349 | |
350 | acpi_hw_low_level_write(8, data, &ec->data_addr); | |
451566f4 DT |
351 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
352 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
353 | if (status) | |
1da177e4 LT |
354 | goto end; |
355 | ||
356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
357 | data, address)); | |
358 | ||
359 | end: | |
451566f4 DT |
360 | acpi_ec_leave_burst_mode(ec); |
361 | up(&ec->sem); | |
1da177e4 LT |
362 | |
363 | if (ec->global_lock) | |
364 | acpi_release_global_lock(glk); | |
365 | ||
451566f4 DT |
366 | if(atomic_read(&ec->leaving_burst) == 2){ |
367 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
17e9c78a | 368 | while(atomic_read(&ec->pending_gpe)){ |
451566f4 DT |
369 | msleep(1); |
370 | } | |
371 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
372 | goto retry; | |
373 | } | |
374 | ||
375 | return_VALUE(status); | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* | |
379 | * Externally callable EC access functions. For now, assume 1 EC only | |
380 | */ | |
381 | int | |
382 | ec_read(u8 addr, u8 *val) | |
383 | { | |
384 | struct acpi_ec *ec; | |
385 | int err; | |
386 | u32 temp_data; | |
387 | ||
388 | if (!first_ec) | |
389 | return -ENODEV; | |
390 | ||
391 | ec = acpi_driver_data(first_ec); | |
392 | ||
393 | err = acpi_ec_read(ec, addr, &temp_data); | |
394 | ||
395 | if (!err) { | |
396 | *val = temp_data; | |
397 | return 0; | |
398 | } | |
399 | else | |
400 | return err; | |
401 | } | |
402 | EXPORT_SYMBOL(ec_read); | |
403 | ||
404 | int | |
405 | ec_write(u8 addr, u8 val) | |
406 | { | |
407 | struct acpi_ec *ec; | |
408 | int err; | |
409 | ||
410 | if (!first_ec) | |
411 | return -ENODEV; | |
412 | ||
413 | ec = acpi_driver_data(first_ec); | |
414 | ||
415 | err = acpi_ec_write(ec, addr, val); | |
416 | ||
417 | return err; | |
418 | } | |
419 | EXPORT_SYMBOL(ec_write); | |
420 | ||
421 | ||
422 | static int | |
423 | acpi_ec_query ( | |
424 | struct acpi_ec *ec, | |
425 | u32 *data) | |
426 | { | |
451566f4 DT |
427 | int status = 0; |
428 | u32 glk; | |
1da177e4 LT |
429 | |
430 | ACPI_FUNCTION_TRACE("acpi_ec_query"); | |
431 | ||
432 | if (!ec || !data) | |
433 | return_VALUE(-EINVAL); | |
1da177e4 LT |
434 | *data = 0; |
435 | ||
436 | if (ec->global_lock) { | |
437 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
438 | if (ACPI_FAILURE(status)) | |
439 | return_VALUE(-ENODEV); | |
440 | } | |
441 | ||
451566f4 DT |
442 | down(&ec->sem); |
443 | if(acpi_ec_enter_burst_mode(ec)) | |
444 | goto end; | |
1da177e4 LT |
445 | /* |
446 | * Query the EC to find out which _Qxx method we need to evaluate. | |
447 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
448 | * bit to be cleared (and thus clearing the interrupt source). | |
449 | */ | |
1da177e4 | 450 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr); |
451566f4 DT |
451 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
452 | if (status){ | |
453 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 454 | goto end; |
451566f4 DT |
455 | } |
456 | ||
1da177e4 | 457 | acpi_hw_low_level_read(8, data, &ec->data_addr); |
451566f4 | 458 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 459 | if (!*data) |
451566f4 | 460 | status = -ENODATA; |
1da177e4 LT |
461 | |
462 | end: | |
451566f4 DT |
463 | acpi_ec_leave_burst_mode(ec); |
464 | up(&ec->sem); | |
1da177e4 LT |
465 | |
466 | if (ec->global_lock) | |
467 | acpi_release_global_lock(glk); | |
468 | ||
451566f4 DT |
469 | if(atomic_read(&ec->leaving_burst) == 2){ |
470 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); | |
451566f4 | 471 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
17e9c78a | 472 | status = -ENODATA; |
451566f4 | 473 | } |
451566f4 | 474 | return_VALUE(status); |
1da177e4 LT |
475 | } |
476 | ||
477 | ||
478 | /* -------------------------------------------------------------------------- | |
479 | Event Management | |
480 | -------------------------------------------------------------------------- */ | |
481 | ||
482 | struct acpi_ec_query_data { | |
483 | acpi_handle handle; | |
484 | u8 data; | |
485 | }; | |
486 | ||
487 | static void | |
488 | acpi_ec_gpe_query ( | |
489 | void *ec_cxt) | |
490 | { | |
491 | struct acpi_ec *ec = (struct acpi_ec *) ec_cxt; | |
451566f4 DT |
492 | u32 value; |
493 | int result = -ENODATA; | |
1da177e4 LT |
494 | static char object_name[5] = {'_','Q','0','0','\0'}; |
495 | const char hex[] = {'0','1','2','3','4','5','6','7', | |
496 | '8','9','A','B','C','D','E','F'}; | |
497 | ||
498 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); | |
499 | ||
451566f4 DT |
500 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
501 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 502 | |
451566f4 | 503 | if (result) |
1da177e4 LT |
504 | goto end; |
505 | ||
1da177e4 LT |
506 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
507 | object_name[3] = hex[(value & 0x0F)]; | |
508 | ||
509 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
510 | ||
511 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); | |
451566f4 | 512 | end: |
17e9c78a | 513 | atomic_dec(&ec->pending_gpe); |
451566f4 | 514 | return; |
1da177e4 LT |
515 | } |
516 | ||
517 | static u32 | |
518 | acpi_ec_gpe_handler ( | |
519 | void *data) | |
520 | { | |
521 | acpi_status status = AE_OK; | |
451566f4 | 522 | u32 value; |
1da177e4 LT |
523 | struct acpi_ec *ec = (struct acpi_ec *) data; |
524 | ||
525 | if (!ec) | |
526 | return ACPI_INTERRUPT_NOT_HANDLED; | |
527 | ||
528 | acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); | |
529 | ||
451566f4 | 530 | value = acpi_ec_read_status(ec); |
1da177e4 | 531 | |
451566f4 DT |
532 | if((value & ACPI_EC_FLAG_IBF) && |
533 | !(value & ACPI_EC_FLAG_BURST) && | |
534 | (atomic_read(&ec->leaving_burst) == 0)) { | |
535 | /* | |
536 | * the embedded controller disables | |
537 | * burst mode for any reason other | |
538 | * than the burst disable command | |
539 | * to process critical event. | |
540 | */ | |
541 | atomic_set(&ec->leaving_burst , 2); /* block current pending transaction | |
542 | and retry */ | |
543 | wake_up(&ec->wait); | |
544 | }else { | |
545 | if ((ec->expect_event == ACPI_EC_EVENT_OBF && | |
546 | (value & ACPI_EC_FLAG_OBF)) || | |
547 | (ec->expect_event == ACPI_EC_EVENT_IBE && | |
548 | !(value & ACPI_EC_FLAG_IBF))) { | |
549 | ec->expect_event = 0; | |
550 | wake_up(&ec->wait); | |
17e9c78a | 551 | return ACPI_INTERRUPT_HANDLED; |
451566f4 DT |
552 | } |
553 | } | |
554 | ||
555 | if (value & ACPI_EC_FLAG_SCI){ | |
556 | atomic_add(1, &ec->pending_gpe) ; | |
557 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, | |
558 | acpi_ec_gpe_query, ec); | |
17e9c78a LY |
559 | return status == AE_OK ? |
560 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; | |
451566f4 | 561 | } |
17e9c78a | 562 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
451566f4 DT |
563 | return status == AE_OK ? |
564 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; | |
1da177e4 LT |
565 | } |
566 | ||
567 | /* -------------------------------------------------------------------------- | |
568 | Address Space Management | |
569 | -------------------------------------------------------------------------- */ | |
570 | ||
571 | static acpi_status | |
572 | acpi_ec_space_setup ( | |
573 | acpi_handle region_handle, | |
574 | u32 function, | |
575 | void *handler_context, | |
576 | void **return_context) | |
577 | { | |
578 | /* | |
579 | * The EC object is in the handler context and is needed | |
580 | * when calling the acpi_ec_space_handler. | |
581 | */ | |
451566f4 DT |
582 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
583 | handler_context : NULL; | |
1da177e4 LT |
584 | |
585 | return AE_OK; | |
586 | } | |
587 | ||
588 | ||
589 | static acpi_status | |
590 | acpi_ec_space_handler ( | |
591 | u32 function, | |
592 | acpi_physical_address address, | |
593 | u32 bit_width, | |
594 | acpi_integer *value, | |
595 | void *handler_context, | |
596 | void *region_context) | |
597 | { | |
598 | int result = 0; | |
599 | struct acpi_ec *ec = NULL; | |
fa9cd547 | 600 | u64 temp = *value; |
1da177e4 LT |
601 | acpi_integer f_v = 0; |
602 | int i = 0; | |
603 | ||
604 | ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); | |
605 | ||
606 | if ((address > 0xFF) || !value || !handler_context) | |
607 | return_VALUE(AE_BAD_PARAMETER); | |
608 | ||
fa9cd547 | 609 | if (bit_width != 8 && acpi_strict) { |
1da177e4 | 610 | printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n"); |
fa9cd547 | 611 | return_VALUE(AE_BAD_PARAMETER); |
1da177e4 LT |
612 | } |
613 | ||
614 | ec = (struct acpi_ec *) handler_context; | |
615 | ||
616 | next_byte: | |
617 | switch (function) { | |
618 | case ACPI_READ: | |
fa9cd547 LY |
619 | temp = 0; |
620 | result = acpi_ec_read(ec, (u8) address, (u32 *)&temp); | |
1da177e4 LT |
621 | break; |
622 | case ACPI_WRITE: | |
fa9cd547 | 623 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
624 | break; |
625 | default: | |
626 | result = -EINVAL; | |
627 | goto out; | |
628 | break; | |
629 | } | |
630 | ||
631 | bit_width -= 8; | |
fa9cd547 LY |
632 | if (bit_width) { |
633 | if (function == ACPI_READ) | |
634 | f_v |= temp << 8 * i; | |
635 | if (function == ACPI_WRITE) | |
636 | temp >>= 8; | |
1da177e4 | 637 | i++; |
83ea7445 | 638 | address++; |
1da177e4 LT |
639 | goto next_byte; |
640 | } | |
641 | ||
fa9cd547 LY |
642 | if (function == ACPI_READ) { |
643 | f_v |= temp << 8 * i; | |
1da177e4 LT |
644 | *value = f_v; |
645 | } | |
646 | ||
647 | ||
648 | out: | |
649 | switch (result) { | |
650 | case -EINVAL: | |
651 | return_VALUE(AE_BAD_PARAMETER); | |
652 | break; | |
653 | case -ENODEV: | |
654 | return_VALUE(AE_NOT_FOUND); | |
655 | break; | |
656 | case -ETIME: | |
657 | return_VALUE(AE_TIME); | |
658 | break; | |
659 | default: | |
660 | return_VALUE(AE_OK); | |
661 | } | |
1da177e4 LT |
662 | } |
663 | ||
664 | ||
665 | /* -------------------------------------------------------------------------- | |
666 | FS Interface (/proc) | |
667 | -------------------------------------------------------------------------- */ | |
668 | ||
669 | static struct proc_dir_entry *acpi_ec_dir; | |
670 | ||
671 | ||
672 | static int | |
673 | acpi_ec_read_info (struct seq_file *seq, void *offset) | |
674 | { | |
675 | struct acpi_ec *ec = (struct acpi_ec *) seq->private; | |
676 | ||
677 | ACPI_FUNCTION_TRACE("acpi_ec_read_info"); | |
678 | ||
679 | if (!ec) | |
680 | goto end; | |
681 | ||
682 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
683 | (u32) ec->gpe_bit); | |
684 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", | |
685 | (u32) ec->status_addr.address, (u32) ec->data_addr.address); | |
686 | seq_printf(seq, "use global lock: %s\n", | |
687 | ec->global_lock?"yes":"no"); | |
17e9c78a | 688 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
1da177e4 LT |
689 | |
690 | end: | |
691 | return_VALUE(0); | |
692 | } | |
693 | ||
694 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
695 | { | |
696 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
697 | } | |
698 | ||
699 | static struct file_operations acpi_ec_info_ops = { | |
700 | .open = acpi_ec_info_open_fs, | |
701 | .read = seq_read, | |
702 | .llseek = seq_lseek, | |
703 | .release = single_release, | |
704 | .owner = THIS_MODULE, | |
705 | }; | |
706 | ||
707 | static int | |
708 | acpi_ec_add_fs ( | |
709 | struct acpi_device *device) | |
710 | { | |
451566f4 | 711 | struct proc_dir_entry *entry; |
1da177e4 LT |
712 | |
713 | ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); | |
714 | ||
715 | if (!acpi_device_dir(device)) { | |
716 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
717 | acpi_ec_dir); | |
718 | if (!acpi_device_dir(device)) | |
719 | return_VALUE(-ENODEV); | |
720 | } | |
721 | ||
722 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
723 | acpi_device_dir(device)); | |
724 | if (!entry) | |
725 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
726 | "Unable to create '%s' fs entry\n", | |
727 | ACPI_EC_FILE_INFO)); | |
728 | else { | |
729 | entry->proc_fops = &acpi_ec_info_ops; | |
730 | entry->data = acpi_driver_data(device); | |
731 | entry->owner = THIS_MODULE; | |
732 | } | |
733 | ||
734 | return_VALUE(0); | |
735 | } | |
736 | ||
737 | ||
738 | static int | |
739 | acpi_ec_remove_fs ( | |
740 | struct acpi_device *device) | |
741 | { | |
742 | ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); | |
743 | ||
744 | if (acpi_device_dir(device)) { | |
745 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
746 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
747 | acpi_device_dir(device) = NULL; | |
748 | } | |
749 | ||
750 | return_VALUE(0); | |
751 | } | |
752 | ||
753 | ||
754 | /* -------------------------------------------------------------------------- | |
755 | Driver Interface | |
756 | -------------------------------------------------------------------------- */ | |
757 | ||
758 | static int | |
759 | acpi_ec_add ( | |
760 | struct acpi_device *device) | |
761 | { | |
451566f4 DT |
762 | int result; |
763 | acpi_status status; | |
764 | struct acpi_ec *ec; | |
1da177e4 LT |
765 | unsigned long uid; |
766 | ||
767 | ACPI_FUNCTION_TRACE("acpi_ec_add"); | |
768 | ||
769 | if (!device) | |
770 | return_VALUE(-EINVAL); | |
771 | ||
772 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
773 | if (!ec) | |
774 | return_VALUE(-ENOMEM); | |
775 | memset(ec, 0, sizeof(struct acpi_ec)); | |
776 | ||
777 | ec->handle = device->handle; | |
778 | ec->uid = -1; | |
451566f4 DT |
779 | atomic_set(&ec->pending_gpe, 0); |
780 | atomic_set(&ec->leaving_burst , 1); | |
781 | init_MUTEX(&ec->sem); | |
782 | init_waitqueue_head(&ec->wait); | |
1da177e4 LT |
783 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
784 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
785 | acpi_driver_data(device) = ec; | |
786 | ||
787 | /* Use the global lock for all EC transactions? */ | |
788 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); | |
789 | ||
790 | /* If our UID matches the UID for the ECDT-enumerated EC, | |
791 | we now have the *real* EC info, so kill the makeshift one.*/ | |
792 | acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid); | |
793 | if (ec_ecdt && ec_ecdt->uid == uid) { | |
794 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, | |
795 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
451566f4 | 796 | |
1da177e4 LT |
797 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); |
798 | ||
799 | kfree(ec_ecdt); | |
800 | } | |
801 | ||
802 | /* Get GPE bit assignment (EC events). */ | |
803 | /* TODO: Add support for _GPE returning a package */ | |
804 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); | |
805 | if (ACPI_FAILURE(status)) { | |
806 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
807 | "Error obtaining GPE bit assignment\n")); | |
808 | result = -ENODEV; | |
809 | goto end; | |
810 | } | |
811 | ||
812 | result = acpi_ec_add_fs(device); | |
813 | if (result) | |
814 | goto end; | |
815 | ||
816 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", | |
817 | acpi_device_name(device), acpi_device_bid(device), | |
818 | (u32) ec->gpe_bit); | |
819 | ||
820 | if (!first_ec) | |
821 | first_ec = device; | |
822 | ||
823 | end: | |
824 | if (result) | |
825 | kfree(ec); | |
826 | ||
827 | return_VALUE(result); | |
828 | } | |
829 | ||
830 | ||
831 | static int | |
832 | acpi_ec_remove ( | |
833 | struct acpi_device *device, | |
834 | int type) | |
835 | { | |
451566f4 | 836 | struct acpi_ec *ec; |
1da177e4 LT |
837 | |
838 | ACPI_FUNCTION_TRACE("acpi_ec_remove"); | |
839 | ||
840 | if (!device) | |
841 | return_VALUE(-EINVAL); | |
842 | ||
843 | ec = acpi_driver_data(device); | |
844 | ||
845 | acpi_ec_remove_fs(device); | |
846 | ||
847 | kfree(ec); | |
848 | ||
849 | return_VALUE(0); | |
850 | } | |
851 | ||
852 | ||
853 | static acpi_status | |
854 | acpi_ec_io_ports ( | |
855 | struct acpi_resource *resource, | |
856 | void *context) | |
857 | { | |
858 | struct acpi_ec *ec = (struct acpi_ec *) context; | |
859 | struct acpi_generic_address *addr; | |
860 | ||
861 | if (resource->id != ACPI_RSTYPE_IO) { | |
862 | return AE_OK; | |
863 | } | |
864 | ||
865 | /* | |
866 | * The first address region returned is the data port, and | |
867 | * the second address region returned is the status/command | |
868 | * port. | |
869 | */ | |
870 | if (ec->data_addr.register_bit_width == 0) { | |
871 | addr = &ec->data_addr; | |
872 | } else if (ec->command_addr.register_bit_width == 0) { | |
873 | addr = &ec->command_addr; | |
874 | } else { | |
875 | return AE_CTRL_TERMINATE; | |
876 | } | |
877 | ||
878 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
879 | addr->register_bit_width = 8; | |
880 | addr->register_bit_offset = 0; | |
881 | addr->address = resource->data.io.min_base_address; | |
882 | ||
883 | return AE_OK; | |
884 | } | |
885 | ||
886 | ||
887 | static int | |
888 | acpi_ec_start ( | |
889 | struct acpi_device *device) | |
890 | { | |
451566f4 DT |
891 | acpi_status status; |
892 | struct acpi_ec *ec; | |
1da177e4 LT |
893 | |
894 | ACPI_FUNCTION_TRACE("acpi_ec_start"); | |
895 | ||
896 | if (!device) | |
897 | return_VALUE(-EINVAL); | |
898 | ||
899 | ec = acpi_driver_data(device); | |
900 | ||
901 | if (!ec) | |
902 | return_VALUE(-EINVAL); | |
903 | ||
904 | /* | |
905 | * Get I/O port addresses. Convert to GAS format. | |
906 | */ | |
907 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, | |
908 | acpi_ec_io_ports, ec); | |
909 | if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { | |
910 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses")); | |
911 | return_VALUE(-ENODEV); | |
912 | } | |
913 | ||
914 | ec->status_addr = ec->command_addr; | |
915 | ||
916 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
917 | (u32) ec->gpe_bit, (u32) ec->command_addr.address, | |
918 | (u32) ec->data_addr.address)); | |
919 | ||
920 | /* | |
921 | * Install GPE handler | |
922 | */ | |
923 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, | |
924 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); | |
925 | if (ACPI_FAILURE(status)) { | |
926 | return_VALUE(-ENODEV); | |
927 | } | |
928 | acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
929 | acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR); | |
930 | ||
931 | status = acpi_install_address_space_handler (ec->handle, | |
932 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
933 | &acpi_ec_space_setup, ec); | |
934 | if (ACPI_FAILURE(status)) { | |
935 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
936 | return_VALUE(-ENODEV); | |
937 | } | |
938 | ||
939 | return_VALUE(AE_OK); | |
940 | } | |
941 | ||
942 | ||
943 | static int | |
944 | acpi_ec_stop ( | |
945 | struct acpi_device *device, | |
946 | int type) | |
947 | { | |
451566f4 DT |
948 | acpi_status status; |
949 | struct acpi_ec *ec; | |
1da177e4 LT |
950 | |
951 | ACPI_FUNCTION_TRACE("acpi_ec_stop"); | |
952 | ||
953 | if (!device) | |
954 | return_VALUE(-EINVAL); | |
955 | ||
956 | ec = acpi_driver_data(device); | |
957 | ||
958 | status = acpi_remove_address_space_handler(ec->handle, | |
959 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); | |
960 | if (ACPI_FAILURE(status)) | |
961 | return_VALUE(-ENODEV); | |
962 | ||
963 | status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); | |
964 | if (ACPI_FAILURE(status)) | |
965 | return_VALUE(-ENODEV); | |
966 | ||
967 | return_VALUE(0); | |
968 | } | |
969 | ||
970 | static acpi_status __init | |
971 | acpi_fake_ecdt_callback ( | |
972 | acpi_handle handle, | |
973 | u32 Level, | |
974 | void *context, | |
975 | void **retval) | |
976 | { | |
977 | acpi_status status; | |
978 | ||
979 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
980 | acpi_ec_io_ports, ec_ecdt); | |
981 | if (ACPI_FAILURE(status)) | |
982 | return status; | |
983 | ec_ecdt->status_addr = ec_ecdt->command_addr; | |
984 | ||
985 | ec_ecdt->uid = -1; | |
986 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); | |
987 | ||
988 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); | |
989 | if (ACPI_FAILURE(status)) | |
990 | return status; | |
1da177e4 LT |
991 | ec_ecdt->global_lock = TRUE; |
992 | ec_ecdt->handle = handle; | |
993 | ||
994 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", | |
995 | (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, | |
996 | (u32) ec_ecdt->data_addr.address); | |
997 | ||
998 | return AE_CTRL_TERMINATE; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1003 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1004 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1005 | * required, but if EC regison is accessed early, it is required. | |
1006 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1007 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1008 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1009 | * all systems found. | |
1010 | */ | |
1011 | static int __init | |
1012 | acpi_ec_fake_ecdt(void) | |
1013 | { | |
1014 | acpi_status status; | |
1015 | int ret = 0; | |
1016 | ||
1017 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1018 | ||
1019 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1020 | if (!ec_ecdt) { | |
1021 | ret = -ENOMEM; | |
1022 | goto error; | |
1023 | } | |
1024 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1025 | ||
1026 | status = acpi_get_devices (ACPI_EC_HID, | |
1027 | acpi_fake_ecdt_callback, | |
1028 | NULL, | |
1029 | NULL); | |
1030 | if (ACPI_FAILURE(status)) { | |
1031 | kfree(ec_ecdt); | |
1032 | ec_ecdt = NULL; | |
1033 | ret = -ENODEV; | |
1034 | goto error; | |
1035 | } | |
1036 | return 0; | |
1037 | error: | |
1038 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); | |
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | static int __init | |
1043 | acpi_ec_get_real_ecdt(void) | |
1044 | { | |
1045 | acpi_status status; | |
1046 | struct acpi_table_ecdt *ecdt_ptr; | |
1047 | ||
451566f4 | 1048 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1da177e4 LT |
1049 | (struct acpi_table_header **) &ecdt_ptr); |
1050 | if (ACPI_FAILURE(status)) | |
1051 | return -ENODEV; | |
1052 | ||
1053 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1054 | ||
1055 | /* | |
1056 | * Generate a temporary ec context to use until the namespace is scanned | |
1057 | */ | |
1058 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
1059 | if (!ec_ecdt) | |
1060 | return -ENOMEM; | |
1061 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); | |
1062 | ||
451566f4 DT |
1063 | init_MUTEX(&ec_ecdt->sem); |
1064 | init_waitqueue_head(&ec_ecdt->wait); | |
1da177e4 LT |
1065 | ec_ecdt->command_addr = ecdt_ptr->ec_control; |
1066 | ec_ecdt->status_addr = ecdt_ptr->ec_control; | |
1067 | ec_ecdt->data_addr = ecdt_ptr->ec_data; | |
1068 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 LT |
1069 | /* use the GL just to be safe */ |
1070 | ec_ecdt->global_lock = TRUE; | |
1071 | ec_ecdt->uid = ecdt_ptr->uid; | |
1072 | ||
1073 | status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); | |
1074 | if (ACPI_FAILURE(status)) { | |
1075 | goto error; | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | error: | |
1080 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1081 | kfree(ec_ecdt); | |
1082 | ec_ecdt = NULL; | |
1083 | ||
1084 | return -ENODEV; | |
1085 | } | |
1086 | ||
1087 | static int __initdata acpi_fake_ecdt_enabled; | |
1088 | int __init | |
1089 | acpi_ec_ecdt_probe (void) | |
1090 | { | |
1091 | acpi_status status; | |
1092 | int ret; | |
1093 | ||
1094 | ret = acpi_ec_get_real_ecdt(); | |
1095 | /* Try to make a fake ECDT */ | |
1096 | if (ret && acpi_fake_ecdt_enabled) { | |
1097 | ret = acpi_ec_fake_ecdt(); | |
1098 | } | |
1099 | ||
1100 | if (ret) | |
1101 | return 0; | |
1102 | ||
1103 | /* | |
1104 | * Install GPE handler | |
1105 | */ | |
1106 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1107 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, | |
1108 | ec_ecdt); | |
1109 | if (ACPI_FAILURE(status)) { | |
1110 | goto error; | |
1111 | } | |
1112 | acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); | |
1113 | acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); | |
1114 | ||
1115 | status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT, | |
1116 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, | |
1117 | &acpi_ec_space_setup, ec_ecdt); | |
1118 | if (ACPI_FAILURE(status)) { | |
1119 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, | |
1120 | &acpi_ec_gpe_handler); | |
1121 | goto error; | |
1122 | } | |
1123 | ||
1124 | return 0; | |
1125 | ||
1126 | error: | |
1127 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); | |
1128 | kfree(ec_ecdt); | |
1129 | ec_ecdt = NULL; | |
1130 | ||
1131 | return -ENODEV; | |
1132 | } | |
1133 | ||
1134 | ||
1135 | static int __init acpi_ec_init (void) | |
1136 | { | |
451566f4 | 1137 | int result; |
1da177e4 LT |
1138 | |
1139 | ACPI_FUNCTION_TRACE("acpi_ec_init"); | |
1140 | ||
1141 | if (acpi_disabled) | |
1142 | return_VALUE(0); | |
1143 | ||
1144 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1145 | if (!acpi_ec_dir) | |
1146 | return_VALUE(-ENODEV); | |
1147 | ||
1148 | /* Now register the driver for the EC */ | |
1149 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1150 | if (result < 0) { | |
1151 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1152 | return_VALUE(-ENODEV); | |
1153 | } | |
1154 | ||
1155 | return_VALUE(result); | |
1156 | } | |
1157 | ||
1158 | subsys_initcall(acpi_ec_init); | |
1159 | ||
1160 | /* EC driver currently not unloadable */ | |
1161 | #if 0 | |
1162 | static void __exit | |
1163 | acpi_ec_exit (void) | |
1164 | { | |
1165 | ACPI_FUNCTION_TRACE("acpi_ec_exit"); | |
1166 | ||
1167 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1168 | ||
1169 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1170 | ||
1171 | return_VOID; | |
1172 | } | |
1173 | #endif /* 0 */ | |
1174 | ||
1175 | static int __init acpi_fake_ecdt_setup(char *str) | |
1176 | { | |
1177 | acpi_fake_ecdt_enabled = 1; | |
1178 | return 0; | |
1179 | } | |
1180 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |