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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" | |
1da177e4 LT |
48 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
49 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 50 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 51 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
1da177e4 LT |
52 | #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */ |
53 | #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */ | |
451566f4 | 54 | #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ |
1da177e4 | 55 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
50526df6 LB |
56 | #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ |
57 | #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */ | |
1da177e4 LT |
58 | #define ACPI_EC_COMMAND_READ 0x80 |
59 | #define ACPI_EC_COMMAND_WRITE 0x81 | |
451566f4 DT |
60 | #define ACPI_EC_BURST_ENABLE 0x82 |
61 | #define ACPI_EC_BURST_DISABLE 0x83 | |
1da177e4 | 62 | #define ACPI_EC_COMMAND_QUERY 0x84 |
02b28a33 LB |
63 | #define EC_POLL 0xFF |
64 | #define EC_INTR 0x00 | |
50526df6 LB |
65 | static int acpi_ec_remove(struct acpi_device *device, int type); |
66 | static int acpi_ec_start(struct acpi_device *device); | |
67 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
02b28a33 LB |
68 | static int acpi_ec_intr_add(struct acpi_device *device); |
69 | static int acpi_ec_poll_add(struct acpi_device *device); | |
1da177e4 LT |
70 | |
71 | static struct acpi_driver acpi_ec_driver = { | |
50526df6 LB |
72 | .name = ACPI_EC_DRIVER_NAME, |
73 | .class = ACPI_EC_CLASS, | |
74 | .ids = ACPI_EC_HID, | |
75 | .ops = { | |
53f11d4f | 76 | .add = acpi_ec_intr_add, |
50526df6 LB |
77 | .remove = acpi_ec_remove, |
78 | .start = acpi_ec_start, | |
79 | .stop = acpi_ec_stop, | |
80 | }, | |
1da177e4 | 81 | }; |
45bea155 LY |
82 | union acpi_ec { |
83 | struct { | |
50526df6 LB |
84 | u32 mode; |
85 | acpi_handle handle; | |
86 | unsigned long uid; | |
87 | unsigned long gpe_bit; | |
88 | struct acpi_generic_address status_addr; | |
89 | struct acpi_generic_address command_addr; | |
90 | struct acpi_generic_address data_addr; | |
91 | unsigned long global_lock; | |
45bea155 LY |
92 | } common; |
93 | ||
94 | struct { | |
50526df6 LB |
95 | u32 mode; |
96 | acpi_handle handle; | |
97 | unsigned long uid; | |
98 | unsigned long gpe_bit; | |
99 | struct acpi_generic_address status_addr; | |
100 | struct acpi_generic_address command_addr; | |
101 | struct acpi_generic_address data_addr; | |
102 | unsigned long global_lock; | |
7c6db5e5 | 103 | u8 expect_event; |
50526df6 LB |
104 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */ |
105 | atomic_t pending_gpe; | |
106 | struct semaphore sem; | |
107 | wait_queue_head_t wait; | |
02b28a33 | 108 | } intr; |
45bea155 LY |
109 | |
110 | struct { | |
50526df6 LB |
111 | u32 mode; |
112 | acpi_handle handle; | |
113 | unsigned long uid; | |
114 | unsigned long gpe_bit; | |
115 | struct acpi_generic_address status_addr; | |
116 | struct acpi_generic_address command_addr; | |
117 | struct acpi_generic_address data_addr; | |
118 | unsigned long global_lock; | |
f9a6ee1a | 119 | struct semaphore sem; |
02b28a33 | 120 | } poll; |
1da177e4 LT |
121 | }; |
122 | ||
02b28a33 | 123 | static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event); |
7c6db5e5 | 124 | static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event); |
d7a76e4c LP |
125 | static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command, |
126 | const u8 *wdata, unsigned wdata_len, | |
127 | u8 *rdata, unsigned rdata_len); | |
128 | static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command, | |
129 | const u8 *wdata, unsigned wdata_len, | |
130 | u8 *rdata, unsigned rdata_len); | |
02b28a33 LB |
131 | static void acpi_ec_gpe_poll_query(void *ec_cxt); |
132 | static void acpi_ec_gpe_intr_query(void *ec_cxt); | |
133 | static u32 acpi_ec_gpe_poll_handler(void *data); | |
134 | static u32 acpi_ec_gpe_intr_handler(void *data); | |
45bea155 | 135 | static acpi_status __init |
02b28a33 | 136 | acpi_fake_ecdt_poll_callback(acpi_handle handle, |
50526df6 | 137 | u32 Level, void *context, void **retval); |
45bea155 LY |
138 | |
139 | static acpi_status __init | |
02b28a33 | 140 | acpi_fake_ecdt_intr_callback(acpi_handle handle, |
50526df6 LB |
141 | u32 Level, void *context, void **retval); |
142 | ||
02b28a33 LB |
143 | static int __init acpi_ec_poll_get_real_ecdt(void); |
144 | static int __init acpi_ec_intr_get_real_ecdt(void); | |
1da177e4 | 145 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
50526df6 | 146 | static union acpi_ec *ec_ecdt; |
1da177e4 LT |
147 | |
148 | /* External interfaces use first EC only, so remember */ | |
149 | static struct acpi_device *first_ec; | |
53f11d4f | 150 | static int acpi_ec_poll_mode = EC_INTR; |
1da177e4 LT |
151 | |
152 | /* -------------------------------------------------------------------------- | |
153 | Transaction Management | |
154 | -------------------------------------------------------------------------- */ | |
155 | ||
858119e1 | 156 | static u32 acpi_ec_read_status(union acpi_ec *ec) |
1da177e4 | 157 | { |
50526df6 | 158 | u32 status = 0; |
1da177e4 | 159 | |
45bea155 | 160 | acpi_hw_low_level_read(8, &status, &ec->common.status_addr); |
451566f4 DT |
161 | return status; |
162 | } | |
163 | ||
7c6db5e5 DS |
164 | static int acpi_ec_check_status(u32 status, u8 event) { |
165 | ||
166 | switch (event) { | |
167 | case ACPI_EC_EVENT_OBF: | |
168 | if (status & ACPI_EC_FLAG_OBF) | |
169 | return 1; | |
170 | case ACPI_EC_EVENT_IBE: | |
171 | if (!(status & ACPI_EC_FLAG_IBF)) | |
172 | return 1; | |
173 | default: | |
174 | break; | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
50526df6 | 180 | static int acpi_ec_wait(union acpi_ec *ec, u8 event) |
45bea155 | 181 | { |
02b28a33 LB |
182 | if (acpi_ec_poll_mode) |
183 | return acpi_ec_poll_wait(ec, event); | |
45bea155 | 184 | else |
02b28a33 | 185 | return acpi_ec_intr_wait(ec, event); |
45bea155 LY |
186 | } |
187 | ||
02b28a33 | 188 | static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event) |
45bea155 | 189 | { |
50526df6 LB |
190 | u32 acpi_ec_status = 0; |
191 | u32 i = ACPI_EC_UDELAY_COUNT; | |
45bea155 LY |
192 | |
193 | if (!ec) | |
194 | return -EINVAL; | |
195 | ||
196 | /* Poll the EC status register waiting for the event to occur. */ | |
197 | switch (event) { | |
198 | case ACPI_EC_EVENT_OBF: | |
199 | do { | |
50526df6 LB |
200 | acpi_hw_low_level_read(8, &acpi_ec_status, |
201 | &ec->common.status_addr); | |
45bea155 LY |
202 | if (acpi_ec_status & ACPI_EC_FLAG_OBF) |
203 | return 0; | |
204 | udelay(ACPI_EC_UDELAY); | |
50526df6 | 205 | } while (--i > 0); |
45bea155 LY |
206 | break; |
207 | case ACPI_EC_EVENT_IBE: | |
208 | do { | |
50526df6 LB |
209 | acpi_hw_low_level_read(8, &acpi_ec_status, |
210 | &ec->common.status_addr); | |
45bea155 LY |
211 | if (!(acpi_ec_status & ACPI_EC_FLAG_IBF)) |
212 | return 0; | |
213 | udelay(ACPI_EC_UDELAY); | |
50526df6 | 214 | } while (--i > 0); |
45bea155 LY |
215 | break; |
216 | default: | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
220 | return -ETIME; | |
221 | } | |
451566f4 | 222 | |
7c6db5e5 DS |
223 | static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event) |
224 | { | |
225 | long time_left; | |
1da177e4 | 226 | |
02b28a33 | 227 | ec->intr.expect_event = event; |
451566f4 | 228 | |
7c6db5e5 | 229 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { |
02b28a33 | 230 | ec->intr.expect_event = 0; |
d550d98d | 231 | return 0; |
716e084e LY |
232 | } |
233 | ||
7c6db5e5 DS |
234 | time_left = wait_event_timeout(ec->intr.wait, !ec->intr.expect_event, |
235 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
50526df6 | 236 | |
02b28a33 | 237 | ec->intr.expect_event = 0; |
7c6db5e5 DS |
238 | if (time_left <= 0) { |
239 | if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) { | |
240 | return 0; | |
241 | } | |
242 | } else { | |
243 | return 0; | |
1da177e4 LT |
244 | } |
245 | ||
d550d98d | 246 | return -ETIME; |
1da177e4 LT |
247 | } |
248 | ||
02b28a33 | 249 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
250 | /* |
251 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
252 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
253 | */ | |
254 | int acpi_ec_enter_burst_mode(union acpi_ec *ec) | |
451566f4 | 255 | { |
50526df6 LB |
256 | u32 tmp = 0; |
257 | int status = 0; | |
451566f4 | 258 | |
451566f4 DT |
259 | |
260 | status = acpi_ec_read_status(ec); | |
50526df6 | 261 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
716e084e | 262 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 263 | if (status) |
716e084e | 264 | goto end; |
50526df6 LB |
265 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, |
266 | &ec->common.command_addr); | |
451566f4 | 267 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
45bea155 | 268 | acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); |
50526df6 | 269 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 270 | return -EINVAL; |
451566f4 | 271 | } |
668d74c0 LY |
272 | } |
273 | ||
02b28a33 | 274 | atomic_set(&ec->intr.leaving_burst, 0); |
d550d98d | 275 | return 0; |
50526df6 | 276 | end: |
a6fc6720 | 277 | ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode"); |
d550d98d | 278 | return -1; |
451566f4 DT |
279 | } |
280 | ||
06a2a385 | 281 | int acpi_ec_leave_burst_mode(union acpi_ec *ec) |
451566f4 | 282 | { |
06a2a385 | 283 | int status = 0; |
451566f4 | 284 | |
451566f4 | 285 | |
06a2a385 LY |
286 | status = acpi_ec_read_status(ec); |
287 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
288 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
289 | if(status) | |
290 | goto end; | |
291 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr); | |
292 | acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
7c6db5e5 | 293 | } |
02b28a33 | 294 | atomic_set(&ec->intr.leaving_burst, 1); |
d550d98d | 295 | return 0; |
06a2a385 | 296 | end: |
a6fc6720 | 297 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"); |
d550d98d | 298 | return -1; |
451566f4 | 299 | } |
02b28a33 | 300 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 301 | |
d7a76e4c LP |
302 | static int acpi_ec_transaction(union acpi_ec *ec, u8 command, |
303 | const u8 *wdata, unsigned wdata_len, | |
304 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 305 | { |
02b28a33 | 306 | if (acpi_ec_poll_mode) |
d7a76e4c | 307 | return acpi_ec_poll_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
45bea155 | 308 | else |
d7a76e4c LP |
309 | return acpi_ec_intr_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
310 | } | |
311 | static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data) | |
312 | { | |
313 | int result; | |
314 | u8 d; | |
315 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, &address, 1, &d, 1); | |
316 | *data = d; | |
317 | return result; | |
45bea155 | 318 | } |
50526df6 | 319 | static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 320 | { |
d7a76e4c LP |
321 | u8 wdata[2] = { address, data }; |
322 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, wdata, 2, NULL, 0); | |
45bea155 | 323 | } |
d7a76e4c LP |
324 | |
325 | static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command, | |
326 | const u8 *wdata, unsigned wdata_len, | |
327 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 328 | { |
d7a76e4c | 329 | int result; |
45bea155 | 330 | |
d7a76e4c | 331 | acpi_hw_low_level_write(8, command, &ec->common.command_addr); |
45bea155 | 332 | |
7c6db5e5 DS |
333 | for (; wdata_len > 0; wdata_len --) { |
334 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
335 | if (result) | |
336 | return result; | |
45bea155 | 337 | |
7c6db5e5 | 338 | acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr); |
d7a76e4c | 339 | } |
45bea155 | 340 | |
7c6db5e5 DS |
341 | if (command == ACPI_EC_COMMAND_WRITE) { |
342 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
343 | if (result) | |
344 | return result; | |
345 | } | |
45bea155 | 346 | |
7c6db5e5 DS |
347 | for (; rdata_len > 0; rdata_len --) { |
348 | u32 d; | |
45bea155 | 349 | |
7c6db5e5 DS |
350 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
351 | if (result) | |
352 | return result; | |
50526df6 | 353 | |
7c6db5e5 DS |
354 | acpi_hw_low_level_read(8, &d, &ec->common.data_addr); |
355 | *(rdata++) = (u8) d; | |
356 | } | |
45bea155 | 357 | |
7c6db5e5 | 358 | return 0; |
45bea155 LY |
359 | } |
360 | ||
d7a76e4c LP |
361 | static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command, |
362 | const u8 *wdata, unsigned wdata_len, | |
363 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 364 | { |
50526df6 | 365 | acpi_status status = AE_OK; |
d7a76e4c | 366 | int result; |
50526df6 | 367 | u32 glk = 0; |
45bea155 | 368 | |
d7a76e4c | 369 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 370 | return -EINVAL; |
45bea155 | 371 | |
d7a76e4c LP |
372 | if (rdata) |
373 | memset(rdata, 0, rdata_len); | |
374 | ||
45bea155 LY |
375 | if (ec->common.global_lock) { |
376 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
377 | if (ACPI_FAILURE(status)) | |
d550d98d | 378 | return -ENODEV; |
d7a76e4c | 379 | } |
45bea155 | 380 | |
f9a6ee1a RT |
381 | if (down_interruptible(&ec->poll.sem)) { |
382 | result = -ERESTARTSYS; | |
383 | goto end_nosem; | |
384 | } | |
45bea155 | 385 | |
d7a76e4c LP |
386 | result = acpi_ec_transaction_unlocked(ec, command, |
387 | wdata, wdata_len, | |
388 | rdata, rdata_len); | |
f9a6ee1a | 389 | up(&ec->poll.sem); |
d7a76e4c | 390 | |
f9a6ee1a | 391 | end_nosem: |
45bea155 LY |
392 | if (ec->common.global_lock) |
393 | acpi_release_global_lock(glk); | |
394 | ||
d550d98d | 395 | return result; |
45bea155 LY |
396 | } |
397 | ||
d7a76e4c LP |
398 | static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command, |
399 | const u8 *wdata, unsigned wdata_len, | |
400 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 401 | { |
d7a76e4c | 402 | int status; |
50526df6 | 403 | u32 glk; |
1da177e4 | 404 | |
d7a76e4c | 405 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 406 | return -EINVAL; |
1da177e4 | 407 | |
d7a76e4c LP |
408 | if (rdata) |
409 | memset(rdata, 0, rdata_len); | |
1da177e4 | 410 | |
45bea155 | 411 | if (ec->common.global_lock) { |
1da177e4 LT |
412 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
413 | if (ACPI_FAILURE(status)) | |
d550d98d | 414 | return -ENODEV; |
1da177e4 | 415 | } |
451566f4 DT |
416 | |
417 | WARN_ON(in_interrupt()); | |
02b28a33 | 418 | down(&ec->intr.sem); |
451566f4 | 419 | |
716e084e LY |
420 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
421 | if (status) { | |
1e8df53c | 422 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 423 | goto end; |
716e084e | 424 | } |
1da177e4 | 425 | |
d7a76e4c LP |
426 | status = acpi_ec_transaction_unlocked(ec, command, |
427 | wdata, wdata_len, | |
428 | rdata, rdata_len); | |
1da177e4 | 429 | |
d7a76e4c | 430 | end: |
02b28a33 | 431 | up(&ec->intr.sem); |
1da177e4 | 432 | |
45bea155 | 433 | if (ec->common.global_lock) |
1da177e4 LT |
434 | acpi_release_global_lock(glk); |
435 | ||
d550d98d | 436 | return status; |
1da177e4 LT |
437 | } |
438 | ||
439 | /* | |
440 | * Externally callable EC access functions. For now, assume 1 EC only | |
441 | */ | |
50526df6 | 442 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 443 | { |
45bea155 | 444 | union acpi_ec *ec; |
1da177e4 LT |
445 | int err; |
446 | u32 temp_data; | |
447 | ||
448 | if (!first_ec) | |
449 | return -ENODEV; | |
450 | ||
451 | ec = acpi_driver_data(first_ec); | |
452 | ||
453 | err = acpi_ec_read(ec, addr, &temp_data); | |
454 | ||
455 | if (!err) { | |
456 | *val = temp_data; | |
457 | return 0; | |
50526df6 | 458 | } else |
1da177e4 LT |
459 | return err; |
460 | } | |
50526df6 | 461 | |
1da177e4 LT |
462 | EXPORT_SYMBOL(ec_read); |
463 | ||
50526df6 | 464 | int ec_write(u8 addr, u8 val) |
1da177e4 | 465 | { |
45bea155 | 466 | union acpi_ec *ec; |
1da177e4 LT |
467 | int err; |
468 | ||
469 | if (!first_ec) | |
470 | return -ENODEV; | |
471 | ||
472 | ec = acpi_driver_data(first_ec); | |
473 | ||
474 | err = acpi_ec_write(ec, addr, val); | |
475 | ||
476 | return err; | |
477 | } | |
50526df6 | 478 | |
1da177e4 LT |
479 | EXPORT_SYMBOL(ec_write); |
480 | ||
d7a76e4c LP |
481 | extern int ec_transaction(u8 command, |
482 | const u8 *wdata, unsigned wdata_len, | |
483 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 484 | { |
d7a76e4c | 485 | union acpi_ec *ec; |
45bea155 | 486 | |
d7a76e4c LP |
487 | if (!first_ec) |
488 | return -ENODEV; | |
45bea155 | 489 | |
d7a76e4c | 490 | ec = acpi_driver_data(first_ec); |
45bea155 | 491 | |
d7a76e4c | 492 | return acpi_ec_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
45bea155 | 493 | } |
1da177e4 | 494 | |
d7a76e4c | 495 | EXPORT_SYMBOL(ec_transaction); |
1da177e4 | 496 | |
d7a76e4c LP |
497 | static int acpi_ec_query(union acpi_ec *ec, u32 * data) { |
498 | int result; | |
499 | u8 d; | |
1da177e4 | 500 | |
d7a76e4c LP |
501 | if (!ec || !data) |
502 | return -EINVAL; | |
1da177e4 | 503 | |
d7a76e4c LP |
504 | /* |
505 | * Query the EC to find out which _Qxx method we need to evaluate. | |
506 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
507 | * bit to be cleared (and thus clearing the interrupt source). | |
508 | */ | |
716e084e | 509 | |
d7a76e4c LP |
510 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
511 | if (result) | |
512 | return result; | |
1da177e4 | 513 | |
d7a76e4c LP |
514 | if (!d) |
515 | return -ENODATA; | |
1da177e4 | 516 | |
d7a76e4c LP |
517 | *data = d; |
518 | return 0; | |
1da177e4 LT |
519 | } |
520 | ||
1da177e4 LT |
521 | /* -------------------------------------------------------------------------- |
522 | Event Management | |
523 | -------------------------------------------------------------------------- */ | |
524 | ||
45bea155 | 525 | union acpi_ec_query_data { |
50526df6 LB |
526 | acpi_handle handle; |
527 | u8 data; | |
1da177e4 LT |
528 | }; |
529 | ||
50526df6 | 530 | static void acpi_ec_gpe_query(void *ec_cxt) |
1da177e4 | 531 | { |
02b28a33 LB |
532 | if (acpi_ec_poll_mode) |
533 | acpi_ec_gpe_poll_query(ec_cxt); | |
45bea155 | 534 | else |
02b28a33 | 535 | acpi_ec_gpe_intr_query(ec_cxt); |
45bea155 LY |
536 | } |
537 | ||
02b28a33 | 538 | static void acpi_ec_gpe_poll_query(void *ec_cxt) |
45bea155 | 539 | { |
50526df6 LB |
540 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
541 | u32 value = 0; | |
50526df6 LB |
542 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; |
543 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
544 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
545 | }; | |
45bea155 | 546 | |
45bea155 LY |
547 | |
548 | if (!ec_cxt) | |
549 | goto end; | |
550 | ||
f9a6ee1a | 551 | if (down_interruptible (&ec->poll.sem)) { |
d550d98d | 552 | return; |
f9a6ee1a | 553 | } |
45bea155 | 554 | acpi_hw_low_level_read(8, &value, &ec->common.command_addr); |
f9a6ee1a | 555 | up(&ec->poll.sem); |
45bea155 LY |
556 | |
557 | /* TBD: Implement asynch events! | |
558 | * NOTE: All we care about are EC-SCI's. Other EC events are | |
559 | * handled via polling (yuck!). This is because some systems | |
560 | * treat EC-SCIs as level (versus EDGE!) triggered, preventing | |
561 | * a purely interrupt-driven approach (grumble, grumble). | |
562 | */ | |
563 | if (!(value & ACPI_EC_FLAG_SCI)) | |
564 | goto end; | |
565 | ||
566 | if (acpi_ec_query(ec, &value)) | |
567 | goto end; | |
568 | ||
569 | object_name[2] = hex[((value >> 4) & 0x0F)]; | |
570 | object_name[3] = hex[(value & 0x0F)]; | |
571 | ||
572 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
573 | ||
574 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); | |
575 | ||
50526df6 | 576 | end: |
45bea155 LY |
577 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
578 | } | |
02b28a33 | 579 | static void acpi_ec_gpe_intr_query(void *ec_cxt) |
45bea155 | 580 | { |
50526df6 LB |
581 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
582 | u32 value; | |
583 | int result = -ENODATA; | |
584 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; | |
585 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
586 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
587 | }; | |
1da177e4 | 588 | |
1da177e4 | 589 | |
451566f4 DT |
590 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
591 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 592 | |
451566f4 | 593 | if (result) |
1da177e4 LT |
594 | goto end; |
595 | ||
1da177e4 LT |
596 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
597 | object_name[3] = hex[(value & 0x0F)]; | |
598 | ||
599 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
600 | ||
45bea155 | 601 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); |
50526df6 | 602 | end: |
02b28a33 | 603 | atomic_dec(&ec->intr.pending_gpe); |
451566f4 | 604 | return; |
1da177e4 LT |
605 | } |
606 | ||
50526df6 | 607 | static u32 acpi_ec_gpe_handler(void *data) |
45bea155 | 608 | { |
02b28a33 LB |
609 | if (acpi_ec_poll_mode) |
610 | return acpi_ec_gpe_poll_handler(data); | |
45bea155 | 611 | else |
02b28a33 | 612 | return acpi_ec_gpe_intr_handler(data); |
45bea155 | 613 | } |
02b28a33 | 614 | static u32 acpi_ec_gpe_poll_handler(void *data) |
45bea155 | 615 | { |
50526df6 LB |
616 | acpi_status status = AE_OK; |
617 | union acpi_ec *ec = (union acpi_ec *)data; | |
45bea155 LY |
618 | |
619 | if (!ec) | |
620 | return ACPI_INTERRUPT_NOT_HANDLED; | |
621 | ||
622 | acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); | |
623 | ||
b8d35192 | 624 | status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec); |
45bea155 LY |
625 | |
626 | if (status == AE_OK) | |
627 | return ACPI_INTERRUPT_HANDLED; | |
628 | else | |
629 | return ACPI_INTERRUPT_NOT_HANDLED; | |
630 | } | |
02b28a33 | 631 | static u32 acpi_ec_gpe_intr_handler(void *data) |
1da177e4 | 632 | { |
50526df6 LB |
633 | acpi_status status = AE_OK; |
634 | u32 value; | |
635 | union acpi_ec *ec = (union acpi_ec *)data; | |
1da177e4 LT |
636 | |
637 | if (!ec) | |
638 | return ACPI_INTERRUPT_NOT_HANDLED; | |
639 | ||
716e084e | 640 | acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 641 | value = acpi_ec_read_status(ec); |
1da177e4 | 642 | |
02b28a33 | 643 | switch (ec->intr.expect_event) { |
716e084e LY |
644 | case ACPI_EC_EVENT_OBF: |
645 | if (!(value & ACPI_EC_FLAG_OBF)) | |
646 | break; | |
49fee981 VL |
647 | ec->intr.expect_event = 0; |
648 | wake_up(&ec->intr.wait); | |
649 | break; | |
716e084e LY |
650 | case ACPI_EC_EVENT_IBE: |
651 | if ((value & ACPI_EC_FLAG_IBF)) | |
652 | break; | |
02b28a33 LB |
653 | ec->intr.expect_event = 0; |
654 | wake_up(&ec->intr.wait); | |
49fee981 | 655 | break; |
716e084e LY |
656 | default: |
657 | break; | |
451566f4 DT |
658 | } |
659 | ||
50526df6 | 660 | if (value & ACPI_EC_FLAG_SCI) { |
02b28a33 | 661 | atomic_add(1, &ec->intr.pending_gpe); |
b8d35192 | 662 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, |
50526df6 | 663 | acpi_ec_gpe_query, ec); |
17e9c78a | 664 | return status == AE_OK ? |
50526df6 LB |
665 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
666 | } | |
45bea155 | 667 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 668 | return status == AE_OK ? |
50526df6 | 669 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
670 | } |
671 | ||
672 | /* -------------------------------------------------------------------------- | |
673 | Address Space Management | |
674 | -------------------------------------------------------------------------- */ | |
675 | ||
676 | static acpi_status | |
50526df6 LB |
677 | acpi_ec_space_setup(acpi_handle region_handle, |
678 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
679 | { |
680 | /* | |
681 | * The EC object is in the handler context and is needed | |
682 | * when calling the acpi_ec_space_handler. | |
683 | */ | |
50526df6 LB |
684 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
685 | handler_context : NULL; | |
1da177e4 LT |
686 | |
687 | return AE_OK; | |
688 | } | |
689 | ||
1da177e4 | 690 | static acpi_status |
50526df6 LB |
691 | acpi_ec_space_handler(u32 function, |
692 | acpi_physical_address address, | |
693 | u32 bit_width, | |
694 | acpi_integer * value, | |
695 | void *handler_context, void *region_context) | |
1da177e4 | 696 | { |
50526df6 LB |
697 | int result = 0; |
698 | union acpi_ec *ec = NULL; | |
699 | u64 temp = *value; | |
700 | acpi_integer f_v = 0; | |
701 | int i = 0; | |
1da177e4 | 702 | |
1da177e4 LT |
703 | |
704 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 705 | return AE_BAD_PARAMETER; |
1da177e4 | 706 | |
fa9cd547 | 707 | if (bit_width != 8 && acpi_strict) { |
50526df6 LB |
708 | printk(KERN_WARNING PREFIX |
709 | "acpi_ec_space_handler: bit_width should be 8\n"); | |
d550d98d | 710 | return AE_BAD_PARAMETER; |
1da177e4 LT |
711 | } |
712 | ||
50526df6 | 713 | ec = (union acpi_ec *)handler_context; |
1da177e4 | 714 | |
50526df6 | 715 | next_byte: |
1da177e4 LT |
716 | switch (function) { |
717 | case ACPI_READ: | |
fa9cd547 | 718 | temp = 0; |
50526df6 | 719 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
720 | break; |
721 | case ACPI_WRITE: | |
fa9cd547 | 722 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
723 | break; |
724 | default: | |
725 | result = -EINVAL; | |
726 | goto out; | |
727 | break; | |
728 | } | |
729 | ||
730 | bit_width -= 8; | |
fa9cd547 LY |
731 | if (bit_width) { |
732 | if (function == ACPI_READ) | |
733 | f_v |= temp << 8 * i; | |
734 | if (function == ACPI_WRITE) | |
735 | temp >>= 8; | |
1da177e4 | 736 | i++; |
83ea7445 | 737 | address++; |
1da177e4 LT |
738 | goto next_byte; |
739 | } | |
740 | ||
fa9cd547 LY |
741 | if (function == ACPI_READ) { |
742 | f_v |= temp << 8 * i; | |
1da177e4 LT |
743 | *value = f_v; |
744 | } | |
745 | ||
50526df6 | 746 | out: |
1da177e4 LT |
747 | switch (result) { |
748 | case -EINVAL: | |
d550d98d | 749 | return AE_BAD_PARAMETER; |
1da177e4 LT |
750 | break; |
751 | case -ENODEV: | |
d550d98d | 752 | return AE_NOT_FOUND; |
1da177e4 LT |
753 | break; |
754 | case -ETIME: | |
d550d98d | 755 | return AE_TIME; |
1da177e4 LT |
756 | break; |
757 | default: | |
d550d98d | 758 | return AE_OK; |
1da177e4 | 759 | } |
1da177e4 LT |
760 | } |
761 | ||
1da177e4 LT |
762 | /* -------------------------------------------------------------------------- |
763 | FS Interface (/proc) | |
764 | -------------------------------------------------------------------------- */ | |
765 | ||
50526df6 | 766 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 767 | |
50526df6 | 768 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 769 | { |
50526df6 | 770 | union acpi_ec *ec = (union acpi_ec *)seq->private; |
1da177e4 | 771 | |
1da177e4 LT |
772 | |
773 | if (!ec) | |
774 | goto end; | |
775 | ||
776 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
50526df6 | 777 | (u32) ec->common.gpe_bit); |
1da177e4 | 778 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
50526df6 LB |
779 | (u32) ec->common.status_addr.address, |
780 | (u32) ec->common.data_addr.address); | |
1da177e4 | 781 | seq_printf(seq, "use global lock: %s\n", |
50526df6 | 782 | ec->common.global_lock ? "yes" : "no"); |
45bea155 | 783 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 784 | |
50526df6 | 785 | end: |
d550d98d | 786 | return 0; |
1da177e4 LT |
787 | } |
788 | ||
789 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
790 | { | |
791 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
792 | } | |
793 | ||
d7508032 | 794 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
795 | .open = acpi_ec_info_open_fs, |
796 | .read = seq_read, | |
797 | .llseek = seq_lseek, | |
798 | .release = single_release, | |
1da177e4 LT |
799 | .owner = THIS_MODULE, |
800 | }; | |
801 | ||
50526df6 | 802 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 803 | { |
50526df6 | 804 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 805 | |
1da177e4 LT |
806 | |
807 | if (!acpi_device_dir(device)) { | |
808 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 809 | acpi_ec_dir); |
1da177e4 | 810 | if (!acpi_device_dir(device)) |
d550d98d | 811 | return -ENODEV; |
1da177e4 LT |
812 | } |
813 | ||
814 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 815 | acpi_device_dir(device)); |
1da177e4 | 816 | if (!entry) |
d550d98d | 817 | return -ENODEV; |
1da177e4 LT |
818 | else { |
819 | entry->proc_fops = &acpi_ec_info_ops; | |
820 | entry->data = acpi_driver_data(device); | |
821 | entry->owner = THIS_MODULE; | |
822 | } | |
823 | ||
d550d98d | 824 | return 0; |
1da177e4 LT |
825 | } |
826 | ||
50526df6 | 827 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 828 | { |
1da177e4 LT |
829 | |
830 | if (acpi_device_dir(device)) { | |
831 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
832 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
833 | acpi_device_dir(device) = NULL; | |
834 | } | |
835 | ||
d550d98d | 836 | return 0; |
1da177e4 LT |
837 | } |
838 | ||
1da177e4 LT |
839 | /* -------------------------------------------------------------------------- |
840 | Driver Interface | |
841 | -------------------------------------------------------------------------- */ | |
842 | ||
02b28a33 | 843 | static int acpi_ec_poll_add(struct acpi_device *device) |
1da177e4 | 844 | { |
50526df6 LB |
845 | int result = 0; |
846 | acpi_status status = AE_OK; | |
847 | union acpi_ec *ec = NULL; | |
45bea155 | 848 | |
45bea155 LY |
849 | |
850 | if (!device) | |
d550d98d | 851 | return -EINVAL; |
45bea155 LY |
852 | |
853 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
854 | if (!ec) | |
d550d98d | 855 | return -ENOMEM; |
45bea155 LY |
856 | memset(ec, 0, sizeof(union acpi_ec)); |
857 | ||
858 | ec->common.handle = device->handle; | |
859 | ec->common.uid = -1; | |
f9a6ee1a | 860 | init_MUTEX(&ec->poll.sem); |
45bea155 LY |
861 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
862 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
863 | acpi_driver_data(device) = ec; | |
864 | ||
865 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
866 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
867 | &ec->common.global_lock); | |
45bea155 | 868 | |
ff2fc3e9 JS |
869 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
870 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
871 | if (ec_ecdt) { | |
45bea155 | 872 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
873 | ACPI_ADR_SPACE_EC, |
874 | &acpi_ec_space_handler); | |
875 | ||
876 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, | |
877 | &acpi_ec_gpe_handler); | |
45bea155 LY |
878 | |
879 | kfree(ec_ecdt); | |
880 | } | |
881 | ||
882 | /* Get GPE bit assignment (EC events). */ | |
883 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
884 | status = |
885 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
886 | &ec->common.gpe_bit); | |
45bea155 | 887 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 888 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit")); |
45bea155 LY |
889 | result = -ENODEV; |
890 | goto end; | |
891 | } | |
892 | ||
893 | result = acpi_ec_add_fs(device); | |
894 | if (result) | |
895 | goto end; | |
896 | ||
02b28a33 | 897 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n", |
50526df6 LB |
898 | acpi_device_name(device), acpi_device_bid(device), |
899 | (u32) ec->common.gpe_bit); | |
45bea155 LY |
900 | |
901 | if (!first_ec) | |
902 | first_ec = device; | |
903 | ||
50526df6 | 904 | end: |
45bea155 LY |
905 | if (result) |
906 | kfree(ec); | |
907 | ||
d550d98d | 908 | return result; |
45bea155 | 909 | } |
02b28a33 | 910 | static int acpi_ec_intr_add(struct acpi_device *device) |
45bea155 | 911 | { |
50526df6 LB |
912 | int result = 0; |
913 | acpi_status status = AE_OK; | |
914 | union acpi_ec *ec = NULL; | |
1da177e4 | 915 | |
1da177e4 LT |
916 | |
917 | if (!device) | |
d550d98d | 918 | return -EINVAL; |
1da177e4 | 919 | |
45bea155 | 920 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 | 921 | if (!ec) |
d550d98d | 922 | return -ENOMEM; |
45bea155 LY |
923 | memset(ec, 0, sizeof(union acpi_ec)); |
924 | ||
925 | ec->common.handle = device->handle; | |
926 | ec->common.uid = -1; | |
02b28a33 LB |
927 | atomic_set(&ec->intr.pending_gpe, 0); |
928 | atomic_set(&ec->intr.leaving_burst, 1); | |
929 | init_MUTEX(&ec->intr.sem); | |
930 | init_waitqueue_head(&ec->intr.wait); | |
1da177e4 LT |
931 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
932 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
933 | acpi_driver_data(device) = ec; | |
934 | ||
935 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
936 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
937 | &ec->common.global_lock); | |
1da177e4 | 938 | |
ff2fc3e9 JS |
939 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
940 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
941 | if (ec_ecdt) { | |
1da177e4 | 942 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
943 | ACPI_ADR_SPACE_EC, |
944 | &acpi_ec_space_handler); | |
451566f4 | 945 | |
50526df6 LB |
946 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
947 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
948 | |
949 | kfree(ec_ecdt); | |
950 | } | |
951 | ||
952 | /* Get GPE bit assignment (EC events). */ | |
953 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
954 | status = |
955 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
956 | &ec->common.gpe_bit); | |
1da177e4 | 957 | if (ACPI_FAILURE(status)) { |
6468463a | 958 | printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n"); |
1da177e4 LT |
959 | result = -ENODEV; |
960 | goto end; | |
961 | } | |
962 | ||
963 | result = acpi_ec_add_fs(device); | |
964 | if (result) | |
965 | goto end; | |
966 | ||
02b28a33 | 967 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n", |
50526df6 LB |
968 | acpi_device_name(device), acpi_device_bid(device), |
969 | (u32) ec->common.gpe_bit); | |
1da177e4 LT |
970 | |
971 | if (!first_ec) | |
972 | first_ec = device; | |
973 | ||
50526df6 | 974 | end: |
1da177e4 LT |
975 | if (result) |
976 | kfree(ec); | |
977 | ||
d550d98d | 978 | return result; |
1da177e4 LT |
979 | } |
980 | ||
50526df6 | 981 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 982 | { |
50526df6 | 983 | union acpi_ec *ec = NULL; |
1da177e4 | 984 | |
1da177e4 LT |
985 | |
986 | if (!device) | |
d550d98d | 987 | return -EINVAL; |
1da177e4 LT |
988 | |
989 | ec = acpi_driver_data(device); | |
990 | ||
991 | acpi_ec_remove_fs(device); | |
992 | ||
993 | kfree(ec); | |
994 | ||
d550d98d | 995 | return 0; |
1da177e4 LT |
996 | } |
997 | ||
1da177e4 | 998 | static acpi_status |
50526df6 | 999 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1000 | { |
50526df6 | 1001 | union acpi_ec *ec = (union acpi_ec *)context; |
1da177e4 LT |
1002 | struct acpi_generic_address *addr; |
1003 | ||
50eca3eb | 1004 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
1005 | return AE_OK; |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * The first address region returned is the data port, and | |
1010 | * the second address region returned is the status/command | |
1011 | * port. | |
1012 | */ | |
45bea155 LY |
1013 | if (ec->common.data_addr.register_bit_width == 0) { |
1014 | addr = &ec->common.data_addr; | |
1015 | } else if (ec->common.command_addr.register_bit_width == 0) { | |
1016 | addr = &ec->common.command_addr; | |
1da177e4 LT |
1017 | } else { |
1018 | return AE_CTRL_TERMINATE; | |
1019 | } | |
1020 | ||
1021 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
1022 | addr->register_bit_width = 8; | |
1023 | addr->register_bit_offset = 0; | |
50eca3eb | 1024 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
1025 | |
1026 | return AE_OK; | |
1027 | } | |
1028 | ||
50526df6 | 1029 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 1030 | { |
50526df6 LB |
1031 | acpi_status status = AE_OK; |
1032 | union acpi_ec *ec = NULL; | |
1da177e4 | 1033 | |
1da177e4 LT |
1034 | |
1035 | if (!device) | |
d550d98d | 1036 | return -EINVAL; |
1da177e4 LT |
1037 | |
1038 | ec = acpi_driver_data(device); | |
1039 | ||
1040 | if (!ec) | |
d550d98d | 1041 | return -EINVAL; |
1da177e4 LT |
1042 | |
1043 | /* | |
1044 | * Get I/O port addresses. Convert to GAS format. | |
1045 | */ | |
45bea155 | 1046 | status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS, |
50526df6 LB |
1047 | acpi_ec_io_ports, ec); |
1048 | if (ACPI_FAILURE(status) | |
1049 | || ec->common.command_addr.register_bit_width == 0) { | |
6468463a | 1050 | printk(KERN_ERR PREFIX "Error getting I/O port addresses\n"); |
d550d98d | 1051 | return -ENODEV; |
1da177e4 LT |
1052 | } |
1053 | ||
45bea155 | 1054 | ec->common.status_addr = ec->common.command_addr; |
1da177e4 LT |
1055 | |
1056 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
50526df6 LB |
1057 | (u32) ec->common.gpe_bit, |
1058 | (u32) ec->common.command_addr.address, | |
1059 | (u32) ec->common.data_addr.address)); | |
1da177e4 LT |
1060 | |
1061 | /* | |
1062 | * Install GPE handler | |
1063 | */ | |
45bea155 | 1064 | status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit, |
50526df6 LB |
1065 | ACPI_GPE_EDGE_TRIGGERED, |
1066 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 1067 | if (ACPI_FAILURE(status)) { |
d550d98d | 1068 | return -ENODEV; |
1da177e4 | 1069 | } |
50526df6 LB |
1070 | acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1071 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 1072 | |
50526df6 LB |
1073 | status = acpi_install_address_space_handler(ec->common.handle, |
1074 | ACPI_ADR_SPACE_EC, | |
1075 | &acpi_ec_space_handler, | |
1076 | &acpi_ec_space_setup, ec); | |
1da177e4 | 1077 | if (ACPI_FAILURE(status)) { |
50526df6 LB |
1078 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, |
1079 | &acpi_ec_gpe_handler); | |
d550d98d | 1080 | return -ENODEV; |
1da177e4 LT |
1081 | } |
1082 | ||
d550d98d | 1083 | return AE_OK; |
1da177e4 LT |
1084 | } |
1085 | ||
50526df6 | 1086 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 1087 | { |
50526df6 LB |
1088 | acpi_status status = AE_OK; |
1089 | union acpi_ec *ec = NULL; | |
1da177e4 | 1090 | |
1da177e4 LT |
1091 | |
1092 | if (!device) | |
d550d98d | 1093 | return -EINVAL; |
1da177e4 LT |
1094 | |
1095 | ec = acpi_driver_data(device); | |
1096 | ||
45bea155 | 1097 | status = acpi_remove_address_space_handler(ec->common.handle, |
50526df6 LB |
1098 | ACPI_ADR_SPACE_EC, |
1099 | &acpi_ec_space_handler); | |
1da177e4 | 1100 | if (ACPI_FAILURE(status)) |
d550d98d | 1101 | return -ENODEV; |
1da177e4 | 1102 | |
50526df6 LB |
1103 | status = |
1104 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, | |
1105 | &acpi_ec_gpe_handler); | |
1da177e4 | 1106 | if (ACPI_FAILURE(status)) |
d550d98d | 1107 | return -ENODEV; |
1da177e4 | 1108 | |
d550d98d | 1109 | return 0; |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | static acpi_status __init | |
50526df6 LB |
1113 | acpi_fake_ecdt_callback(acpi_handle handle, |
1114 | u32 Level, void *context, void **retval) | |
1da177e4 | 1115 | { |
45bea155 | 1116 | |
02b28a33 LB |
1117 | if (acpi_ec_poll_mode) |
1118 | return acpi_fake_ecdt_poll_callback(handle, | |
50526df6 | 1119 | Level, context, retval); |
45bea155 | 1120 | else |
02b28a33 | 1121 | return acpi_fake_ecdt_intr_callback(handle, |
50526df6 | 1122 | Level, context, retval); |
45bea155 LY |
1123 | } |
1124 | ||
1125 | static acpi_status __init | |
02b28a33 | 1126 | acpi_fake_ecdt_poll_callback(acpi_handle handle, |
50526df6 | 1127 | u32 Level, void *context, void **retval) |
45bea155 | 1128 | { |
50526df6 | 1129 | acpi_status status; |
45bea155 LY |
1130 | |
1131 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
50526df6 | 1132 | acpi_ec_io_ports, ec_ecdt); |
45bea155 LY |
1133 | if (ACPI_FAILURE(status)) |
1134 | return status; | |
1135 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; | |
1136 | ||
1137 | ec_ecdt->common.uid = -1; | |
1138 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1139 | ||
50526df6 LB |
1140 | status = |
1141 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1142 | &ec_ecdt->common.gpe_bit); | |
45bea155 LY |
1143 | if (ACPI_FAILURE(status)) |
1144 | return status; | |
f9a6ee1a | 1145 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1146 | ec_ecdt->common.global_lock = TRUE; |
1147 | ec_ecdt->common.handle = handle; | |
1148 | ||
50526df6 LB |
1149 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1150 | (u32) ec_ecdt->common.gpe_bit, | |
1151 | (u32) ec_ecdt->common.command_addr.address, | |
1152 | (u32) ec_ecdt->common.data_addr.address); | |
45bea155 LY |
1153 | |
1154 | return AE_CTRL_TERMINATE; | |
1155 | } | |
1156 | ||
1157 | static acpi_status __init | |
02b28a33 | 1158 | acpi_fake_ecdt_intr_callback(acpi_handle handle, |
50526df6 | 1159 | u32 Level, void *context, void **retval) |
45bea155 | 1160 | { |
50526df6 | 1161 | acpi_status status; |
1da177e4 | 1162 | |
02b28a33 LB |
1163 | init_MUTEX(&ec_ecdt->intr.sem); |
1164 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
1da177e4 | 1165 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 1166 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
1167 | if (ACPI_FAILURE(status)) |
1168 | return status; | |
45bea155 | 1169 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; |
1da177e4 | 1170 | |
45bea155 LY |
1171 | ec_ecdt->common.uid = -1; |
1172 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1da177e4 | 1173 | |
50526df6 LB |
1174 | status = |
1175 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1176 | &ec_ecdt->common.gpe_bit); | |
1da177e4 LT |
1177 | if (ACPI_FAILURE(status)) |
1178 | return status; | |
45bea155 LY |
1179 | ec_ecdt->common.global_lock = TRUE; |
1180 | ec_ecdt->common.handle = handle; | |
1da177e4 | 1181 | |
50526df6 LB |
1182 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1183 | (u32) ec_ecdt->common.gpe_bit, | |
1184 | (u32) ec_ecdt->common.command_addr.address, | |
1185 | (u32) ec_ecdt->common.data_addr.address); | |
1da177e4 LT |
1186 | |
1187 | return AE_CTRL_TERMINATE; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1192 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1193 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1194 | * required, but if EC regison is accessed early, it is required. | |
1195 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1196 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1197 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1198 | * all systems found. | |
1199 | */ | |
50526df6 | 1200 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 1201 | { |
50526df6 LB |
1202 | acpi_status status; |
1203 | int ret = 0; | |
1da177e4 LT |
1204 | |
1205 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1206 | ||
45bea155 | 1207 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1208 | if (!ec_ecdt) { |
1209 | ret = -ENOMEM; | |
1210 | goto error; | |
1211 | } | |
45bea155 | 1212 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1da177e4 | 1213 | |
50526df6 LB |
1214 | status = acpi_get_devices(ACPI_EC_HID, |
1215 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
1216 | if (ACPI_FAILURE(status)) { |
1217 | kfree(ec_ecdt); | |
1218 | ec_ecdt = NULL; | |
1219 | ret = -ENODEV; | |
1220 | goto error; | |
1221 | } | |
1222 | return 0; | |
50526df6 | 1223 | error: |
1da177e4 LT |
1224 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
1225 | return ret; | |
1226 | } | |
1227 | ||
50526df6 | 1228 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 1229 | { |
02b28a33 LB |
1230 | if (acpi_ec_poll_mode) |
1231 | return acpi_ec_poll_get_real_ecdt(); | |
45bea155 | 1232 | else |
02b28a33 | 1233 | return acpi_ec_intr_get_real_ecdt(); |
45bea155 LY |
1234 | } |
1235 | ||
02b28a33 | 1236 | static int __init acpi_ec_poll_get_real_ecdt(void) |
45bea155 | 1237 | { |
50526df6 LB |
1238 | acpi_status status; |
1239 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 1240 | |
50526df6 LB |
1241 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1242 | (struct acpi_table_header **) | |
1243 | &ecdt_ptr); | |
45bea155 LY |
1244 | if (ACPI_FAILURE(status)) |
1245 | return -ENODEV; | |
1246 | ||
1247 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1248 | ||
1249 | /* | |
1250 | * Generate a temporary ec context to use until the namespace is scanned | |
1251 | */ | |
1252 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
1253 | if (!ec_ecdt) | |
1254 | return -ENOMEM; | |
1255 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); | |
1256 | ||
1257 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; | |
1258 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1259 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1260 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
f9a6ee1a | 1261 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1262 | /* use the GL just to be safe */ |
1263 | ec_ecdt->common.global_lock = TRUE; | |
1264 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1265 | ||
50526df6 LB |
1266 | status = |
1267 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
45bea155 LY |
1268 | if (ACPI_FAILURE(status)) { |
1269 | goto error; | |
1270 | } | |
1271 | ||
1272 | return 0; | |
50526df6 | 1273 | error: |
45bea155 LY |
1274 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1275 | kfree(ec_ecdt); | |
1276 | ec_ecdt = NULL; | |
1277 | ||
1278 | return -ENODEV; | |
1279 | } | |
1280 | ||
02b28a33 | 1281 | static int __init acpi_ec_intr_get_real_ecdt(void) |
1da177e4 | 1282 | { |
50526df6 LB |
1283 | acpi_status status; |
1284 | struct acpi_table_ecdt *ecdt_ptr; | |
1da177e4 | 1285 | |
451566f4 | 1286 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
50526df6 LB |
1287 | (struct acpi_table_header **) |
1288 | &ecdt_ptr); | |
1da177e4 LT |
1289 | if (ACPI_FAILURE(status)) |
1290 | return -ENODEV; | |
1291 | ||
1292 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1293 | ||
1294 | /* | |
1295 | * Generate a temporary ec context to use until the namespace is scanned | |
1296 | */ | |
45bea155 | 1297 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1298 | if (!ec_ecdt) |
1299 | return -ENOMEM; | |
45bea155 LY |
1300 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1301 | ||
02b28a33 LB |
1302 | init_MUTEX(&ec_ecdt->intr.sem); |
1303 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
45bea155 LY |
1304 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; |
1305 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1306 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1307 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 1308 | /* use the GL just to be safe */ |
45bea155 LY |
1309 | ec_ecdt->common.global_lock = TRUE; |
1310 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1da177e4 | 1311 | |
50526df6 LB |
1312 | status = |
1313 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
1da177e4 LT |
1314 | if (ACPI_FAILURE(status)) { |
1315 | goto error; | |
1316 | } | |
1317 | ||
1318 | return 0; | |
50526df6 | 1319 | error: |
1da177e4 LT |
1320 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1321 | kfree(ec_ecdt); | |
1322 | ec_ecdt = NULL; | |
1323 | ||
1324 | return -ENODEV; | |
1325 | } | |
1326 | ||
1327 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 1328 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 1329 | { |
50526df6 LB |
1330 | acpi_status status; |
1331 | int ret; | |
1da177e4 LT |
1332 | |
1333 | ret = acpi_ec_get_real_ecdt(); | |
1334 | /* Try to make a fake ECDT */ | |
1335 | if (ret && acpi_fake_ecdt_enabled) { | |
1336 | ret = acpi_ec_fake_ecdt(); | |
1337 | } | |
1338 | ||
1339 | if (ret) | |
1340 | return 0; | |
1341 | ||
1342 | /* | |
1343 | * Install GPE handler | |
1344 | */ | |
45bea155 | 1345 | status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 LB |
1346 | ACPI_GPE_EDGE_TRIGGERED, |
1347 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1348 | if (ACPI_FAILURE(status)) { |
1349 | goto error; | |
1350 | } | |
50526df6 LB |
1351 | acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1352 | acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR); | |
1353 | ||
1354 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1355 | ACPI_ADR_SPACE_EC, | |
1356 | &acpi_ec_space_handler, | |
1357 | &acpi_ec_space_setup, | |
1358 | ec_ecdt); | |
1da177e4 | 1359 | if (ACPI_FAILURE(status)) { |
45bea155 | 1360 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 | 1361 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1362 | goto error; |
1363 | } | |
1364 | ||
1365 | return 0; | |
1366 | ||
50526df6 | 1367 | error: |
1da177e4 LT |
1368 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1369 | kfree(ec_ecdt); | |
1370 | ec_ecdt = NULL; | |
1371 | ||
1372 | return -ENODEV; | |
1373 | } | |
1374 | ||
50526df6 | 1375 | static int __init acpi_ec_init(void) |
1da177e4 | 1376 | { |
50526df6 | 1377 | int result = 0; |
1da177e4 | 1378 | |
1da177e4 LT |
1379 | |
1380 | if (acpi_disabled) | |
d550d98d | 1381 | return 0; |
1da177e4 LT |
1382 | |
1383 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1384 | if (!acpi_ec_dir) | |
d550d98d | 1385 | return -ENODEV; |
1da177e4 LT |
1386 | |
1387 | /* Now register the driver for the EC */ | |
1388 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1389 | if (result < 0) { | |
1390 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1391 | return -ENODEV; |
1da177e4 LT |
1392 | } |
1393 | ||
d550d98d | 1394 | return result; |
1da177e4 LT |
1395 | } |
1396 | ||
1397 | subsys_initcall(acpi_ec_init); | |
1398 | ||
1399 | /* EC driver currently not unloadable */ | |
1400 | #if 0 | |
50526df6 | 1401 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1402 | { |
1da177e4 LT |
1403 | |
1404 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1405 | ||
1406 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1407 | ||
d550d98d | 1408 | return; |
1da177e4 | 1409 | } |
50526df6 | 1410 | #endif /* 0 */ |
1da177e4 LT |
1411 | |
1412 | static int __init acpi_fake_ecdt_setup(char *str) | |
1413 | { | |
1414 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1415 | return 1; |
1da177e4 | 1416 | } |
7b15f5e7 | 1417 | |
1da177e4 | 1418 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1419 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1420 | { |
02b28a33 | 1421 | int intr; |
7b15f5e7 | 1422 | |
02b28a33 | 1423 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1424 | return 0; |
1425 | ||
02b28a33 LB |
1426 | if (intr) { |
1427 | acpi_ec_poll_mode = EC_INTR; | |
1428 | acpi_ec_driver.ops.add = acpi_ec_intr_add; | |
7b15f5e7 | 1429 | } else { |
02b28a33 LB |
1430 | acpi_ec_poll_mode = EC_POLL; |
1431 | acpi_ec_driver.ops.add = acpi_ec_poll_add; | |
7b15f5e7 | 1432 | } |
02b28a33 | 1433 | printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling"); |
9b41046c | 1434 | return 1; |
45bea155 | 1435 | } |
50526df6 | 1436 | |
53f11d4f | 1437 | __setup("ec_intr=", acpi_ec_set_intr_mode); |