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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; | |
103 | unsigned int expect_event; | |
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 LB |
123 | static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event); |
124 | static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int 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 | ||
50526df6 | 164 | static int acpi_ec_wait(union acpi_ec *ec, u8 event) |
45bea155 | 165 | { |
02b28a33 LB |
166 | if (acpi_ec_poll_mode) |
167 | return acpi_ec_poll_wait(ec, event); | |
45bea155 | 168 | else |
02b28a33 | 169 | return acpi_ec_intr_wait(ec, event); |
45bea155 LY |
170 | } |
171 | ||
02b28a33 | 172 | static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event) |
45bea155 | 173 | { |
50526df6 LB |
174 | u32 acpi_ec_status = 0; |
175 | u32 i = ACPI_EC_UDELAY_COUNT; | |
45bea155 LY |
176 | |
177 | if (!ec) | |
178 | return -EINVAL; | |
179 | ||
180 | /* Poll the EC status register waiting for the event to occur. */ | |
181 | switch (event) { | |
182 | case ACPI_EC_EVENT_OBF: | |
183 | do { | |
50526df6 LB |
184 | acpi_hw_low_level_read(8, &acpi_ec_status, |
185 | &ec->common.status_addr); | |
45bea155 LY |
186 | if (acpi_ec_status & ACPI_EC_FLAG_OBF) |
187 | return 0; | |
188 | udelay(ACPI_EC_UDELAY); | |
50526df6 | 189 | } while (--i > 0); |
45bea155 LY |
190 | break; |
191 | case ACPI_EC_EVENT_IBE: | |
192 | do { | |
50526df6 LB |
193 | acpi_hw_low_level_read(8, &acpi_ec_status, |
194 | &ec->common.status_addr); | |
45bea155 LY |
195 | if (!(acpi_ec_status & ACPI_EC_FLAG_IBF)) |
196 | return 0; | |
197 | udelay(ACPI_EC_UDELAY); | |
50526df6 | 198 | } while (--i > 0); |
45bea155 LY |
199 | break; |
200 | default: | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | return -ETIME; | |
205 | } | |
02b28a33 | 206 | static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event) |
451566f4 | 207 | { |
50526df6 | 208 | int result = 0; |
451566f4 | 209 | |
1da177e4 | 210 | |
02b28a33 | 211 | ec->intr.expect_event = event; |
451566f4 DT |
212 | smp_mb(); |
213 | ||
716e084e | 214 | switch (event) { |
716e084e | 215 | case ACPI_EC_EVENT_IBE: |
49fee981 | 216 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) { |
02b28a33 | 217 | ec->intr.expect_event = 0; |
d550d98d | 218 | return 0; |
716e084e LY |
219 | } |
220 | break; | |
06a2a385 LY |
221 | default: |
222 | break; | |
716e084e LY |
223 | } |
224 | ||
02b28a33 LB |
225 | result = wait_event_timeout(ec->intr.wait, |
226 | !ec->intr.expect_event, | |
50526df6 LB |
227 | msecs_to_jiffies(ACPI_EC_DELAY)); |
228 | ||
02b28a33 | 229 | ec->intr.expect_event = 0; |
451566f4 DT |
230 | smp_mb(); |
231 | ||
451566f4 DT |
232 | /* |
233 | * Verify that the event in question has actually happened by | |
234 | * querying EC status. Do the check even if operation timed-out | |
235 | * to make sure that we did not miss interrupt. | |
236 | */ | |
1da177e4 LT |
237 | switch (event) { |
238 | case ACPI_EC_EVENT_OBF: | |
451566f4 | 239 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
d550d98d | 240 | return 0; |
1da177e4 | 241 | break; |
451566f4 | 242 | |
1da177e4 | 243 | case ACPI_EC_EVENT_IBE: |
451566f4 | 244 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
d550d98d | 245 | return 0; |
1da177e4 | 246 | break; |
1da177e4 LT |
247 | } |
248 | ||
d550d98d | 249 | return -ETIME; |
1da177e4 LT |
250 | } |
251 | ||
02b28a33 | 252 | #ifdef ACPI_FUTURE_USAGE |
06a2a385 LY |
253 | /* |
254 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
255 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
256 | */ | |
257 | int acpi_ec_enter_burst_mode(union acpi_ec *ec) | |
451566f4 | 258 | { |
50526df6 LB |
259 | u32 tmp = 0; |
260 | int status = 0; | |
451566f4 | 261 | |
451566f4 DT |
262 | |
263 | status = acpi_ec_read_status(ec); | |
50526df6 | 264 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
716e084e | 265 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 266 | if (status) |
716e084e | 267 | goto end; |
50526df6 LB |
268 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, |
269 | &ec->common.command_addr); | |
451566f4 | 270 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
45bea155 | 271 | acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); |
50526df6 | 272 | if (tmp != 0x90) { /* Burst ACK byte */ |
d550d98d | 273 | return -EINVAL; |
451566f4 | 274 | } |
668d74c0 LY |
275 | } |
276 | ||
02b28a33 | 277 | atomic_set(&ec->intr.leaving_burst, 0); |
d550d98d | 278 | return 0; |
50526df6 | 279 | end: |
a6fc6720 | 280 | ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode"); |
d550d98d | 281 | return -1; |
451566f4 DT |
282 | } |
283 | ||
06a2a385 | 284 | int acpi_ec_leave_burst_mode(union acpi_ec *ec) |
451566f4 | 285 | { |
06a2a385 | 286 | int status = 0; |
451566f4 | 287 | |
451566f4 | 288 | |
06a2a385 LY |
289 | status = acpi_ec_read_status(ec); |
290 | if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ | |
291 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
292 | if(status) | |
293 | goto end; | |
294 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr); | |
295 | acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); | |
296 | } | |
02b28a33 | 297 | atomic_set(&ec->intr.leaving_burst, 1); |
d550d98d | 298 | return 0; |
06a2a385 | 299 | end: |
a6fc6720 | 300 | ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"); |
d550d98d | 301 | return -1; |
451566f4 | 302 | } |
02b28a33 | 303 | #endif /* ACPI_FUTURE_USAGE */ |
451566f4 | 304 | |
d7a76e4c LP |
305 | static int acpi_ec_transaction(union acpi_ec *ec, u8 command, |
306 | const u8 *wdata, unsigned wdata_len, | |
307 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 308 | { |
02b28a33 | 309 | if (acpi_ec_poll_mode) |
d7a76e4c | 310 | return acpi_ec_poll_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
45bea155 | 311 | else |
d7a76e4c LP |
312 | return acpi_ec_intr_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
313 | } | |
314 | static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data) | |
315 | { | |
316 | int result; | |
317 | u8 d; | |
318 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, &address, 1, &d, 1); | |
319 | *data = d; | |
320 | return result; | |
45bea155 | 321 | } |
50526df6 | 322 | static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 323 | { |
d7a76e4c LP |
324 | u8 wdata[2] = { address, data }; |
325 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, wdata, 2, NULL, 0); | |
45bea155 | 326 | } |
d7a76e4c LP |
327 | |
328 | static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command, | |
329 | const u8 *wdata, unsigned wdata_len, | |
330 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 331 | { |
d7a76e4c | 332 | int result; |
45bea155 | 333 | |
d7a76e4c | 334 | acpi_hw_low_level_write(8, command, &ec->common.command_addr); |
45bea155 | 335 | |
d7a76e4c LP |
336 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
337 | if (result) | |
338 | return result; | |
45bea155 | 339 | |
d7a76e4c | 340 | for (; wdata_len > 0; wdata_len --) { |
45bea155 | 341 | |
d7a76e4c | 342 | acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr); |
45bea155 | 343 | |
d7a76e4c LP |
344 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
345 | if (result) | |
346 | return result; | |
347 | } | |
45bea155 | 348 | |
45bea155 | 349 | |
d7a76e4c LP |
350 | for (; rdata_len > 0; rdata_len --) { |
351 | u32 d; | |
45bea155 | 352 | |
d7a76e4c LP |
353 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
354 | if (result) | |
355 | return result; | |
50526df6 | 356 | |
d7a76e4c LP |
357 | acpi_hw_low_level_read(8, &d, &ec->common.data_addr); |
358 | *(rdata++) = (u8) d; | |
359 | } | |
45bea155 | 360 | |
d7a76e4c | 361 | return 0; |
45bea155 LY |
362 | } |
363 | ||
d7a76e4c LP |
364 | static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command, |
365 | const u8 *wdata, unsigned wdata_len, | |
366 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 367 | { |
50526df6 | 368 | acpi_status status = AE_OK; |
d7a76e4c | 369 | int result; |
50526df6 | 370 | u32 glk = 0; |
45bea155 | 371 | |
d7a76e4c | 372 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 373 | return -EINVAL; |
45bea155 | 374 | |
d7a76e4c LP |
375 | if (rdata) |
376 | memset(rdata, 0, rdata_len); | |
377 | ||
45bea155 LY |
378 | if (ec->common.global_lock) { |
379 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
380 | if (ACPI_FAILURE(status)) | |
d550d98d | 381 | return -ENODEV; |
d7a76e4c | 382 | } |
45bea155 | 383 | |
f9a6ee1a RT |
384 | if (down_interruptible(&ec->poll.sem)) { |
385 | result = -ERESTARTSYS; | |
386 | goto end_nosem; | |
387 | } | |
45bea155 | 388 | |
d7a76e4c LP |
389 | result = acpi_ec_transaction_unlocked(ec, command, |
390 | wdata, wdata_len, | |
391 | rdata, rdata_len); | |
f9a6ee1a | 392 | up(&ec->poll.sem); |
d7a76e4c | 393 | |
f9a6ee1a | 394 | end_nosem: |
45bea155 LY |
395 | if (ec->common.global_lock) |
396 | acpi_release_global_lock(glk); | |
397 | ||
d550d98d | 398 | return result; |
45bea155 LY |
399 | } |
400 | ||
d7a76e4c LP |
401 | static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command, |
402 | const u8 *wdata, unsigned wdata_len, | |
403 | u8 *rdata, unsigned rdata_len) | |
1da177e4 | 404 | { |
d7a76e4c | 405 | int status; |
50526df6 | 406 | u32 glk; |
1da177e4 | 407 | |
d7a76e4c | 408 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 409 | return -EINVAL; |
1da177e4 | 410 | |
d7a76e4c LP |
411 | if (rdata) |
412 | memset(rdata, 0, rdata_len); | |
1da177e4 | 413 | |
45bea155 | 414 | if (ec->common.global_lock) { |
1da177e4 LT |
415 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
416 | if (ACPI_FAILURE(status)) | |
d550d98d | 417 | return -ENODEV; |
1da177e4 | 418 | } |
451566f4 DT |
419 | |
420 | WARN_ON(in_interrupt()); | |
02b28a33 | 421 | down(&ec->intr.sem); |
451566f4 | 422 | |
716e084e LY |
423 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
424 | if (status) { | |
1e8df53c | 425 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 426 | goto end; |
716e084e | 427 | } |
1da177e4 | 428 | |
d7a76e4c LP |
429 | status = acpi_ec_transaction_unlocked(ec, command, |
430 | wdata, wdata_len, | |
431 | rdata, rdata_len); | |
1da177e4 | 432 | |
d7a76e4c | 433 | end: |
02b28a33 | 434 | up(&ec->intr.sem); |
1da177e4 | 435 | |
45bea155 | 436 | if (ec->common.global_lock) |
1da177e4 LT |
437 | acpi_release_global_lock(glk); |
438 | ||
d550d98d | 439 | return status; |
1da177e4 LT |
440 | } |
441 | ||
442 | /* | |
443 | * Externally callable EC access functions. For now, assume 1 EC only | |
444 | */ | |
50526df6 | 445 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 446 | { |
45bea155 | 447 | union acpi_ec *ec; |
1da177e4 LT |
448 | int err; |
449 | u32 temp_data; | |
450 | ||
451 | if (!first_ec) | |
452 | return -ENODEV; | |
453 | ||
454 | ec = acpi_driver_data(first_ec); | |
455 | ||
456 | err = acpi_ec_read(ec, addr, &temp_data); | |
457 | ||
458 | if (!err) { | |
459 | *val = temp_data; | |
460 | return 0; | |
50526df6 | 461 | } else |
1da177e4 LT |
462 | return err; |
463 | } | |
50526df6 | 464 | |
1da177e4 LT |
465 | EXPORT_SYMBOL(ec_read); |
466 | ||
50526df6 | 467 | int ec_write(u8 addr, u8 val) |
1da177e4 | 468 | { |
45bea155 | 469 | union acpi_ec *ec; |
1da177e4 LT |
470 | int err; |
471 | ||
472 | if (!first_ec) | |
473 | return -ENODEV; | |
474 | ||
475 | ec = acpi_driver_data(first_ec); | |
476 | ||
477 | err = acpi_ec_write(ec, addr, val); | |
478 | ||
479 | return err; | |
480 | } | |
50526df6 | 481 | |
1da177e4 LT |
482 | EXPORT_SYMBOL(ec_write); |
483 | ||
d7a76e4c LP |
484 | extern int ec_transaction(u8 command, |
485 | const u8 *wdata, unsigned wdata_len, | |
486 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 487 | { |
d7a76e4c | 488 | union acpi_ec *ec; |
45bea155 | 489 | |
d7a76e4c LP |
490 | if (!first_ec) |
491 | return -ENODEV; | |
45bea155 | 492 | |
d7a76e4c | 493 | ec = acpi_driver_data(first_ec); |
45bea155 | 494 | |
d7a76e4c | 495 | return acpi_ec_transaction(ec, command, wdata, wdata_len, rdata, rdata_len); |
45bea155 | 496 | } |
1da177e4 | 497 | |
d7a76e4c | 498 | EXPORT_SYMBOL(ec_transaction); |
1da177e4 | 499 | |
d7a76e4c LP |
500 | static int acpi_ec_query(union acpi_ec *ec, u32 * data) { |
501 | int result; | |
502 | u8 d; | |
1da177e4 | 503 | |
d7a76e4c LP |
504 | if (!ec || !data) |
505 | return -EINVAL; | |
1da177e4 | 506 | |
d7a76e4c LP |
507 | /* |
508 | * Query the EC to find out which _Qxx method we need to evaluate. | |
509 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
510 | * bit to be cleared (and thus clearing the interrupt source). | |
511 | */ | |
716e084e | 512 | |
d7a76e4c LP |
513 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
514 | if (result) | |
515 | return result; | |
1da177e4 | 516 | |
d7a76e4c LP |
517 | if (!d) |
518 | return -ENODATA; | |
1da177e4 | 519 | |
d7a76e4c LP |
520 | *data = d; |
521 | return 0; | |
1da177e4 LT |
522 | } |
523 | ||
1da177e4 LT |
524 | /* -------------------------------------------------------------------------- |
525 | Event Management | |
526 | -------------------------------------------------------------------------- */ | |
527 | ||
45bea155 | 528 | union acpi_ec_query_data { |
50526df6 LB |
529 | acpi_handle handle; |
530 | u8 data; | |
1da177e4 LT |
531 | }; |
532 | ||
50526df6 | 533 | static void acpi_ec_gpe_query(void *ec_cxt) |
1da177e4 | 534 | { |
02b28a33 LB |
535 | if (acpi_ec_poll_mode) |
536 | acpi_ec_gpe_poll_query(ec_cxt); | |
45bea155 | 537 | else |
02b28a33 | 538 | acpi_ec_gpe_intr_query(ec_cxt); |
45bea155 LY |
539 | } |
540 | ||
02b28a33 | 541 | static void acpi_ec_gpe_poll_query(void *ec_cxt) |
45bea155 | 542 | { |
50526df6 LB |
543 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
544 | u32 value = 0; | |
50526df6 LB |
545 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; |
546 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
547 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
548 | }; | |
45bea155 | 549 | |
45bea155 LY |
550 | |
551 | if (!ec_cxt) | |
552 | goto end; | |
553 | ||
f9a6ee1a | 554 | if (down_interruptible (&ec->poll.sem)) { |
d550d98d | 555 | return; |
f9a6ee1a | 556 | } |
45bea155 | 557 | acpi_hw_low_level_read(8, &value, &ec->common.command_addr); |
f9a6ee1a | 558 | up(&ec->poll.sem); |
45bea155 LY |
559 | |
560 | /* TBD: Implement asynch events! | |
561 | * NOTE: All we care about are EC-SCI's. Other EC events are | |
562 | * handled via polling (yuck!). This is because some systems | |
563 | * treat EC-SCIs as level (versus EDGE!) triggered, preventing | |
564 | * a purely interrupt-driven approach (grumble, grumble). | |
565 | */ | |
566 | if (!(value & ACPI_EC_FLAG_SCI)) | |
567 | goto end; | |
568 | ||
569 | if (acpi_ec_query(ec, &value)) | |
570 | goto end; | |
571 | ||
572 | object_name[2] = hex[((value >> 4) & 0x0F)]; | |
573 | object_name[3] = hex[(value & 0x0F)]; | |
574 | ||
575 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
576 | ||
577 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); | |
578 | ||
50526df6 | 579 | end: |
45bea155 LY |
580 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
581 | } | |
02b28a33 | 582 | static void acpi_ec_gpe_intr_query(void *ec_cxt) |
45bea155 | 583 | { |
50526df6 LB |
584 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
585 | u32 value; | |
586 | int result = -ENODATA; | |
587 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; | |
588 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
589 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
590 | }; | |
1da177e4 | 591 | |
1da177e4 | 592 | |
451566f4 DT |
593 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
594 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 595 | |
451566f4 | 596 | if (result) |
1da177e4 LT |
597 | goto end; |
598 | ||
1da177e4 LT |
599 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
600 | object_name[3] = hex[(value & 0x0F)]; | |
601 | ||
602 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
603 | ||
45bea155 | 604 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); |
50526df6 | 605 | end: |
02b28a33 | 606 | atomic_dec(&ec->intr.pending_gpe); |
451566f4 | 607 | return; |
1da177e4 LT |
608 | } |
609 | ||
50526df6 | 610 | static u32 acpi_ec_gpe_handler(void *data) |
45bea155 | 611 | { |
02b28a33 LB |
612 | if (acpi_ec_poll_mode) |
613 | return acpi_ec_gpe_poll_handler(data); | |
45bea155 | 614 | else |
02b28a33 | 615 | return acpi_ec_gpe_intr_handler(data); |
45bea155 | 616 | } |
02b28a33 | 617 | static u32 acpi_ec_gpe_poll_handler(void *data) |
45bea155 | 618 | { |
50526df6 LB |
619 | acpi_status status = AE_OK; |
620 | union acpi_ec *ec = (union acpi_ec *)data; | |
45bea155 LY |
621 | |
622 | if (!ec) | |
623 | return ACPI_INTERRUPT_NOT_HANDLED; | |
624 | ||
625 | acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); | |
626 | ||
b8d35192 | 627 | status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec); |
45bea155 LY |
628 | |
629 | if (status == AE_OK) | |
630 | return ACPI_INTERRUPT_HANDLED; | |
631 | else | |
632 | return ACPI_INTERRUPT_NOT_HANDLED; | |
633 | } | |
02b28a33 | 634 | static u32 acpi_ec_gpe_intr_handler(void *data) |
1da177e4 | 635 | { |
50526df6 LB |
636 | acpi_status status = AE_OK; |
637 | u32 value; | |
638 | union acpi_ec *ec = (union acpi_ec *)data; | |
1da177e4 LT |
639 | |
640 | if (!ec) | |
641 | return ACPI_INTERRUPT_NOT_HANDLED; | |
642 | ||
716e084e | 643 | acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 644 | value = acpi_ec_read_status(ec); |
1da177e4 | 645 | |
02b28a33 | 646 | switch (ec->intr.expect_event) { |
716e084e LY |
647 | case ACPI_EC_EVENT_OBF: |
648 | if (!(value & ACPI_EC_FLAG_OBF)) | |
649 | break; | |
49fee981 VL |
650 | ec->intr.expect_event = 0; |
651 | wake_up(&ec->intr.wait); | |
652 | break; | |
716e084e LY |
653 | case ACPI_EC_EVENT_IBE: |
654 | if ((value & ACPI_EC_FLAG_IBF)) | |
655 | break; | |
02b28a33 LB |
656 | ec->intr.expect_event = 0; |
657 | wake_up(&ec->intr.wait); | |
49fee981 | 658 | break; |
716e084e LY |
659 | default: |
660 | break; | |
451566f4 DT |
661 | } |
662 | ||
50526df6 | 663 | if (value & ACPI_EC_FLAG_SCI) { |
02b28a33 | 664 | atomic_add(1, &ec->intr.pending_gpe); |
b8d35192 | 665 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, |
50526df6 | 666 | acpi_ec_gpe_query, ec); |
17e9c78a | 667 | return status == AE_OK ? |
50526df6 LB |
668 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
669 | } | |
45bea155 | 670 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 671 | return status == AE_OK ? |
50526df6 | 672 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
673 | } |
674 | ||
675 | /* -------------------------------------------------------------------------- | |
676 | Address Space Management | |
677 | -------------------------------------------------------------------------- */ | |
678 | ||
679 | static acpi_status | |
50526df6 LB |
680 | acpi_ec_space_setup(acpi_handle region_handle, |
681 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
682 | { |
683 | /* | |
684 | * The EC object is in the handler context and is needed | |
685 | * when calling the acpi_ec_space_handler. | |
686 | */ | |
50526df6 LB |
687 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
688 | handler_context : NULL; | |
1da177e4 LT |
689 | |
690 | return AE_OK; | |
691 | } | |
692 | ||
1da177e4 | 693 | static acpi_status |
50526df6 LB |
694 | acpi_ec_space_handler(u32 function, |
695 | acpi_physical_address address, | |
696 | u32 bit_width, | |
697 | acpi_integer * value, | |
698 | void *handler_context, void *region_context) | |
1da177e4 | 699 | { |
50526df6 LB |
700 | int result = 0; |
701 | union acpi_ec *ec = NULL; | |
702 | u64 temp = *value; | |
703 | acpi_integer f_v = 0; | |
704 | int i = 0; | |
1da177e4 | 705 | |
1da177e4 LT |
706 | |
707 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 708 | return AE_BAD_PARAMETER; |
1da177e4 | 709 | |
fa9cd547 | 710 | if (bit_width != 8 && acpi_strict) { |
50526df6 LB |
711 | printk(KERN_WARNING PREFIX |
712 | "acpi_ec_space_handler: bit_width should be 8\n"); | |
d550d98d | 713 | return AE_BAD_PARAMETER; |
1da177e4 LT |
714 | } |
715 | ||
50526df6 | 716 | ec = (union acpi_ec *)handler_context; |
1da177e4 | 717 | |
50526df6 | 718 | next_byte: |
1da177e4 LT |
719 | switch (function) { |
720 | case ACPI_READ: | |
fa9cd547 | 721 | temp = 0; |
50526df6 | 722 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
723 | break; |
724 | case ACPI_WRITE: | |
fa9cd547 | 725 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
726 | break; |
727 | default: | |
728 | result = -EINVAL; | |
729 | goto out; | |
730 | break; | |
731 | } | |
732 | ||
733 | bit_width -= 8; | |
fa9cd547 LY |
734 | if (bit_width) { |
735 | if (function == ACPI_READ) | |
736 | f_v |= temp << 8 * i; | |
737 | if (function == ACPI_WRITE) | |
738 | temp >>= 8; | |
1da177e4 | 739 | i++; |
83ea7445 | 740 | address++; |
1da177e4 LT |
741 | goto next_byte; |
742 | } | |
743 | ||
fa9cd547 LY |
744 | if (function == ACPI_READ) { |
745 | f_v |= temp << 8 * i; | |
1da177e4 LT |
746 | *value = f_v; |
747 | } | |
748 | ||
50526df6 | 749 | out: |
1da177e4 LT |
750 | switch (result) { |
751 | case -EINVAL: | |
d550d98d | 752 | return AE_BAD_PARAMETER; |
1da177e4 LT |
753 | break; |
754 | case -ENODEV: | |
d550d98d | 755 | return AE_NOT_FOUND; |
1da177e4 LT |
756 | break; |
757 | case -ETIME: | |
d550d98d | 758 | return AE_TIME; |
1da177e4 LT |
759 | break; |
760 | default: | |
d550d98d | 761 | return AE_OK; |
1da177e4 | 762 | } |
1da177e4 LT |
763 | } |
764 | ||
1da177e4 LT |
765 | /* -------------------------------------------------------------------------- |
766 | FS Interface (/proc) | |
767 | -------------------------------------------------------------------------- */ | |
768 | ||
50526df6 | 769 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 770 | |
50526df6 | 771 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 772 | { |
50526df6 | 773 | union acpi_ec *ec = (union acpi_ec *)seq->private; |
1da177e4 | 774 | |
1da177e4 LT |
775 | |
776 | if (!ec) | |
777 | goto end; | |
778 | ||
779 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
50526df6 | 780 | (u32) ec->common.gpe_bit); |
1da177e4 | 781 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
50526df6 LB |
782 | (u32) ec->common.status_addr.address, |
783 | (u32) ec->common.data_addr.address); | |
1da177e4 | 784 | seq_printf(seq, "use global lock: %s\n", |
50526df6 | 785 | ec->common.global_lock ? "yes" : "no"); |
45bea155 | 786 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 787 | |
50526df6 | 788 | end: |
d550d98d | 789 | return 0; |
1da177e4 LT |
790 | } |
791 | ||
792 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
793 | { | |
794 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
795 | } | |
796 | ||
d7508032 | 797 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
798 | .open = acpi_ec_info_open_fs, |
799 | .read = seq_read, | |
800 | .llseek = seq_lseek, | |
801 | .release = single_release, | |
1da177e4 LT |
802 | .owner = THIS_MODULE, |
803 | }; | |
804 | ||
50526df6 | 805 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 806 | { |
50526df6 | 807 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 808 | |
1da177e4 LT |
809 | |
810 | if (!acpi_device_dir(device)) { | |
811 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 812 | acpi_ec_dir); |
1da177e4 | 813 | if (!acpi_device_dir(device)) |
d550d98d | 814 | return -ENODEV; |
1da177e4 LT |
815 | } |
816 | ||
817 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 818 | acpi_device_dir(device)); |
1da177e4 | 819 | if (!entry) |
d550d98d | 820 | return -ENODEV; |
1da177e4 LT |
821 | else { |
822 | entry->proc_fops = &acpi_ec_info_ops; | |
823 | entry->data = acpi_driver_data(device); | |
824 | entry->owner = THIS_MODULE; | |
825 | } | |
826 | ||
d550d98d | 827 | return 0; |
1da177e4 LT |
828 | } |
829 | ||
50526df6 | 830 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 831 | { |
1da177e4 LT |
832 | |
833 | if (acpi_device_dir(device)) { | |
834 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
835 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
836 | acpi_device_dir(device) = NULL; | |
837 | } | |
838 | ||
d550d98d | 839 | return 0; |
1da177e4 LT |
840 | } |
841 | ||
1da177e4 LT |
842 | /* -------------------------------------------------------------------------- |
843 | Driver Interface | |
844 | -------------------------------------------------------------------------- */ | |
845 | ||
02b28a33 | 846 | static int acpi_ec_poll_add(struct acpi_device *device) |
1da177e4 | 847 | { |
50526df6 LB |
848 | int result = 0; |
849 | acpi_status status = AE_OK; | |
850 | union acpi_ec *ec = NULL; | |
45bea155 | 851 | |
45bea155 LY |
852 | |
853 | if (!device) | |
d550d98d | 854 | return -EINVAL; |
45bea155 LY |
855 | |
856 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
857 | if (!ec) | |
d550d98d | 858 | return -ENOMEM; |
45bea155 LY |
859 | memset(ec, 0, sizeof(union acpi_ec)); |
860 | ||
861 | ec->common.handle = device->handle; | |
862 | ec->common.uid = -1; | |
f9a6ee1a | 863 | init_MUTEX(&ec->poll.sem); |
45bea155 LY |
864 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
865 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
866 | acpi_driver_data(device) = ec; | |
867 | ||
868 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
869 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
870 | &ec->common.global_lock); | |
45bea155 | 871 | |
ff2fc3e9 JS |
872 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
873 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
874 | if (ec_ecdt) { | |
45bea155 | 875 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
876 | ACPI_ADR_SPACE_EC, |
877 | &acpi_ec_space_handler); | |
878 | ||
879 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, | |
880 | &acpi_ec_gpe_handler); | |
45bea155 LY |
881 | |
882 | kfree(ec_ecdt); | |
883 | } | |
884 | ||
885 | /* Get GPE bit assignment (EC events). */ | |
886 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
887 | status = |
888 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
889 | &ec->common.gpe_bit); | |
45bea155 | 890 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 891 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit")); |
45bea155 LY |
892 | result = -ENODEV; |
893 | goto end; | |
894 | } | |
895 | ||
896 | result = acpi_ec_add_fs(device); | |
897 | if (result) | |
898 | goto end; | |
899 | ||
02b28a33 | 900 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n", |
50526df6 LB |
901 | acpi_device_name(device), acpi_device_bid(device), |
902 | (u32) ec->common.gpe_bit); | |
45bea155 LY |
903 | |
904 | if (!first_ec) | |
905 | first_ec = device; | |
906 | ||
50526df6 | 907 | end: |
45bea155 LY |
908 | if (result) |
909 | kfree(ec); | |
910 | ||
d550d98d | 911 | return result; |
45bea155 | 912 | } |
02b28a33 | 913 | static int acpi_ec_intr_add(struct acpi_device *device) |
45bea155 | 914 | { |
50526df6 LB |
915 | int result = 0; |
916 | acpi_status status = AE_OK; | |
917 | union acpi_ec *ec = NULL; | |
1da177e4 | 918 | |
1da177e4 LT |
919 | |
920 | if (!device) | |
d550d98d | 921 | return -EINVAL; |
1da177e4 | 922 | |
45bea155 | 923 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 | 924 | if (!ec) |
d550d98d | 925 | return -ENOMEM; |
45bea155 LY |
926 | memset(ec, 0, sizeof(union acpi_ec)); |
927 | ||
928 | ec->common.handle = device->handle; | |
929 | ec->common.uid = -1; | |
02b28a33 LB |
930 | atomic_set(&ec->intr.pending_gpe, 0); |
931 | atomic_set(&ec->intr.leaving_burst, 1); | |
932 | init_MUTEX(&ec->intr.sem); | |
933 | init_waitqueue_head(&ec->intr.wait); | |
1da177e4 LT |
934 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
935 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
936 | acpi_driver_data(device) = ec; | |
937 | ||
938 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
939 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
940 | &ec->common.global_lock); | |
1da177e4 | 941 | |
ff2fc3e9 JS |
942 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
943 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
944 | if (ec_ecdt) { | |
1da177e4 | 945 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
946 | ACPI_ADR_SPACE_EC, |
947 | &acpi_ec_space_handler); | |
451566f4 | 948 | |
50526df6 LB |
949 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
950 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
951 | |
952 | kfree(ec_ecdt); | |
953 | } | |
954 | ||
955 | /* Get GPE bit assignment (EC events). */ | |
956 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
957 | status = |
958 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
959 | &ec->common.gpe_bit); | |
1da177e4 | 960 | if (ACPI_FAILURE(status)) { |
6468463a | 961 | printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n"); |
1da177e4 LT |
962 | result = -ENODEV; |
963 | goto end; | |
964 | } | |
965 | ||
966 | result = acpi_ec_add_fs(device); | |
967 | if (result) | |
968 | goto end; | |
969 | ||
02b28a33 | 970 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n", |
50526df6 LB |
971 | acpi_device_name(device), acpi_device_bid(device), |
972 | (u32) ec->common.gpe_bit); | |
1da177e4 LT |
973 | |
974 | if (!first_ec) | |
975 | first_ec = device; | |
976 | ||
50526df6 | 977 | end: |
1da177e4 LT |
978 | if (result) |
979 | kfree(ec); | |
980 | ||
d550d98d | 981 | return result; |
1da177e4 LT |
982 | } |
983 | ||
50526df6 | 984 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 985 | { |
50526df6 | 986 | union acpi_ec *ec = NULL; |
1da177e4 | 987 | |
1da177e4 LT |
988 | |
989 | if (!device) | |
d550d98d | 990 | return -EINVAL; |
1da177e4 LT |
991 | |
992 | ec = acpi_driver_data(device); | |
993 | ||
994 | acpi_ec_remove_fs(device); | |
995 | ||
996 | kfree(ec); | |
997 | ||
d550d98d | 998 | return 0; |
1da177e4 LT |
999 | } |
1000 | ||
1da177e4 | 1001 | static acpi_status |
50526df6 | 1002 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1003 | { |
50526df6 | 1004 | union acpi_ec *ec = (union acpi_ec *)context; |
1da177e4 LT |
1005 | struct acpi_generic_address *addr; |
1006 | ||
50eca3eb | 1007 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
1008 | return AE_OK; |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * The first address region returned is the data port, and | |
1013 | * the second address region returned is the status/command | |
1014 | * port. | |
1015 | */ | |
45bea155 LY |
1016 | if (ec->common.data_addr.register_bit_width == 0) { |
1017 | addr = &ec->common.data_addr; | |
1018 | } else if (ec->common.command_addr.register_bit_width == 0) { | |
1019 | addr = &ec->common.command_addr; | |
1da177e4 LT |
1020 | } else { |
1021 | return AE_CTRL_TERMINATE; | |
1022 | } | |
1023 | ||
1024 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
1025 | addr->register_bit_width = 8; | |
1026 | addr->register_bit_offset = 0; | |
50eca3eb | 1027 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
1028 | |
1029 | return AE_OK; | |
1030 | } | |
1031 | ||
50526df6 | 1032 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 1033 | { |
50526df6 LB |
1034 | acpi_status status = AE_OK; |
1035 | union acpi_ec *ec = NULL; | |
1da177e4 | 1036 | |
1da177e4 LT |
1037 | |
1038 | if (!device) | |
d550d98d | 1039 | return -EINVAL; |
1da177e4 LT |
1040 | |
1041 | ec = acpi_driver_data(device); | |
1042 | ||
1043 | if (!ec) | |
d550d98d | 1044 | return -EINVAL; |
1da177e4 LT |
1045 | |
1046 | /* | |
1047 | * Get I/O port addresses. Convert to GAS format. | |
1048 | */ | |
45bea155 | 1049 | status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS, |
50526df6 LB |
1050 | acpi_ec_io_ports, ec); |
1051 | if (ACPI_FAILURE(status) | |
1052 | || ec->common.command_addr.register_bit_width == 0) { | |
6468463a | 1053 | printk(KERN_ERR PREFIX "Error getting I/O port addresses\n"); |
d550d98d | 1054 | return -ENODEV; |
1da177e4 LT |
1055 | } |
1056 | ||
45bea155 | 1057 | ec->common.status_addr = ec->common.command_addr; |
1da177e4 LT |
1058 | |
1059 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
50526df6 LB |
1060 | (u32) ec->common.gpe_bit, |
1061 | (u32) ec->common.command_addr.address, | |
1062 | (u32) ec->common.data_addr.address)); | |
1da177e4 LT |
1063 | |
1064 | /* | |
1065 | * Install GPE handler | |
1066 | */ | |
45bea155 | 1067 | status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit, |
50526df6 LB |
1068 | ACPI_GPE_EDGE_TRIGGERED, |
1069 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 1070 | if (ACPI_FAILURE(status)) { |
d550d98d | 1071 | return -ENODEV; |
1da177e4 | 1072 | } |
50526df6 LB |
1073 | acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1074 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 1075 | |
50526df6 LB |
1076 | status = acpi_install_address_space_handler(ec->common.handle, |
1077 | ACPI_ADR_SPACE_EC, | |
1078 | &acpi_ec_space_handler, | |
1079 | &acpi_ec_space_setup, ec); | |
1da177e4 | 1080 | if (ACPI_FAILURE(status)) { |
50526df6 LB |
1081 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, |
1082 | &acpi_ec_gpe_handler); | |
d550d98d | 1083 | return -ENODEV; |
1da177e4 LT |
1084 | } |
1085 | ||
d550d98d | 1086 | return AE_OK; |
1da177e4 LT |
1087 | } |
1088 | ||
50526df6 | 1089 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 1090 | { |
50526df6 LB |
1091 | acpi_status status = AE_OK; |
1092 | union acpi_ec *ec = NULL; | |
1da177e4 | 1093 | |
1da177e4 LT |
1094 | |
1095 | if (!device) | |
d550d98d | 1096 | return -EINVAL; |
1da177e4 LT |
1097 | |
1098 | ec = acpi_driver_data(device); | |
1099 | ||
45bea155 | 1100 | status = acpi_remove_address_space_handler(ec->common.handle, |
50526df6 LB |
1101 | ACPI_ADR_SPACE_EC, |
1102 | &acpi_ec_space_handler); | |
1da177e4 | 1103 | if (ACPI_FAILURE(status)) |
d550d98d | 1104 | return -ENODEV; |
1da177e4 | 1105 | |
50526df6 LB |
1106 | status = |
1107 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, | |
1108 | &acpi_ec_gpe_handler); | |
1da177e4 | 1109 | if (ACPI_FAILURE(status)) |
d550d98d | 1110 | return -ENODEV; |
1da177e4 | 1111 | |
d550d98d | 1112 | return 0; |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | static acpi_status __init | |
50526df6 LB |
1116 | acpi_fake_ecdt_callback(acpi_handle handle, |
1117 | u32 Level, void *context, void **retval) | |
1da177e4 | 1118 | { |
45bea155 | 1119 | |
02b28a33 LB |
1120 | if (acpi_ec_poll_mode) |
1121 | return acpi_fake_ecdt_poll_callback(handle, | |
50526df6 | 1122 | Level, context, retval); |
45bea155 | 1123 | else |
02b28a33 | 1124 | return acpi_fake_ecdt_intr_callback(handle, |
50526df6 | 1125 | Level, context, retval); |
45bea155 LY |
1126 | } |
1127 | ||
1128 | static acpi_status __init | |
02b28a33 | 1129 | acpi_fake_ecdt_poll_callback(acpi_handle handle, |
50526df6 | 1130 | u32 Level, void *context, void **retval) |
45bea155 | 1131 | { |
50526df6 | 1132 | acpi_status status; |
45bea155 LY |
1133 | |
1134 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
50526df6 | 1135 | acpi_ec_io_ports, ec_ecdt); |
45bea155 LY |
1136 | if (ACPI_FAILURE(status)) |
1137 | return status; | |
1138 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; | |
1139 | ||
1140 | ec_ecdt->common.uid = -1; | |
1141 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1142 | ||
50526df6 LB |
1143 | status = |
1144 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1145 | &ec_ecdt->common.gpe_bit); | |
45bea155 LY |
1146 | if (ACPI_FAILURE(status)) |
1147 | return status; | |
f9a6ee1a | 1148 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1149 | ec_ecdt->common.global_lock = TRUE; |
1150 | ec_ecdt->common.handle = handle; | |
1151 | ||
50526df6 LB |
1152 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1153 | (u32) ec_ecdt->common.gpe_bit, | |
1154 | (u32) ec_ecdt->common.command_addr.address, | |
1155 | (u32) ec_ecdt->common.data_addr.address); | |
45bea155 LY |
1156 | |
1157 | return AE_CTRL_TERMINATE; | |
1158 | } | |
1159 | ||
1160 | static acpi_status __init | |
02b28a33 | 1161 | acpi_fake_ecdt_intr_callback(acpi_handle handle, |
50526df6 | 1162 | u32 Level, void *context, void **retval) |
45bea155 | 1163 | { |
50526df6 | 1164 | acpi_status status; |
1da177e4 | 1165 | |
02b28a33 LB |
1166 | init_MUTEX(&ec_ecdt->intr.sem); |
1167 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
1da177e4 | 1168 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 1169 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
1170 | if (ACPI_FAILURE(status)) |
1171 | return status; | |
45bea155 | 1172 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; |
1da177e4 | 1173 | |
45bea155 LY |
1174 | ec_ecdt->common.uid = -1; |
1175 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1da177e4 | 1176 | |
50526df6 LB |
1177 | status = |
1178 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1179 | &ec_ecdt->common.gpe_bit); | |
1da177e4 LT |
1180 | if (ACPI_FAILURE(status)) |
1181 | return status; | |
45bea155 LY |
1182 | ec_ecdt->common.global_lock = TRUE; |
1183 | ec_ecdt->common.handle = handle; | |
1da177e4 | 1184 | |
50526df6 LB |
1185 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1186 | (u32) ec_ecdt->common.gpe_bit, | |
1187 | (u32) ec_ecdt->common.command_addr.address, | |
1188 | (u32) ec_ecdt->common.data_addr.address); | |
1da177e4 LT |
1189 | |
1190 | return AE_CTRL_TERMINATE; | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1195 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1196 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1197 | * required, but if EC regison is accessed early, it is required. | |
1198 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1199 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1200 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1201 | * all systems found. | |
1202 | */ | |
50526df6 | 1203 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 1204 | { |
50526df6 LB |
1205 | acpi_status status; |
1206 | int ret = 0; | |
1da177e4 LT |
1207 | |
1208 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1209 | ||
45bea155 | 1210 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1211 | if (!ec_ecdt) { |
1212 | ret = -ENOMEM; | |
1213 | goto error; | |
1214 | } | |
45bea155 | 1215 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1da177e4 | 1216 | |
50526df6 LB |
1217 | status = acpi_get_devices(ACPI_EC_HID, |
1218 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
1219 | if (ACPI_FAILURE(status)) { |
1220 | kfree(ec_ecdt); | |
1221 | ec_ecdt = NULL; | |
1222 | ret = -ENODEV; | |
1223 | goto error; | |
1224 | } | |
1225 | return 0; | |
50526df6 | 1226 | error: |
1da177e4 LT |
1227 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
1228 | return ret; | |
1229 | } | |
1230 | ||
50526df6 | 1231 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 1232 | { |
02b28a33 LB |
1233 | if (acpi_ec_poll_mode) |
1234 | return acpi_ec_poll_get_real_ecdt(); | |
45bea155 | 1235 | else |
02b28a33 | 1236 | return acpi_ec_intr_get_real_ecdt(); |
45bea155 LY |
1237 | } |
1238 | ||
02b28a33 | 1239 | static int __init acpi_ec_poll_get_real_ecdt(void) |
45bea155 | 1240 | { |
50526df6 LB |
1241 | acpi_status status; |
1242 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 1243 | |
50526df6 LB |
1244 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1245 | (struct acpi_table_header **) | |
1246 | &ecdt_ptr); | |
45bea155 LY |
1247 | if (ACPI_FAILURE(status)) |
1248 | return -ENODEV; | |
1249 | ||
1250 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1251 | ||
1252 | /* | |
1253 | * Generate a temporary ec context to use until the namespace is scanned | |
1254 | */ | |
1255 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
1256 | if (!ec_ecdt) | |
1257 | return -ENOMEM; | |
1258 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); | |
1259 | ||
1260 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; | |
1261 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1262 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1263 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
f9a6ee1a | 1264 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1265 | /* use the GL just to be safe */ |
1266 | ec_ecdt->common.global_lock = TRUE; | |
1267 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1268 | ||
50526df6 LB |
1269 | status = |
1270 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
45bea155 LY |
1271 | if (ACPI_FAILURE(status)) { |
1272 | goto error; | |
1273 | } | |
1274 | ||
1275 | return 0; | |
50526df6 | 1276 | error: |
45bea155 LY |
1277 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1278 | kfree(ec_ecdt); | |
1279 | ec_ecdt = NULL; | |
1280 | ||
1281 | return -ENODEV; | |
1282 | } | |
1283 | ||
02b28a33 | 1284 | static int __init acpi_ec_intr_get_real_ecdt(void) |
1da177e4 | 1285 | { |
50526df6 LB |
1286 | acpi_status status; |
1287 | struct acpi_table_ecdt *ecdt_ptr; | |
1da177e4 | 1288 | |
451566f4 | 1289 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
50526df6 LB |
1290 | (struct acpi_table_header **) |
1291 | &ecdt_ptr); | |
1da177e4 LT |
1292 | if (ACPI_FAILURE(status)) |
1293 | return -ENODEV; | |
1294 | ||
1295 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1296 | ||
1297 | /* | |
1298 | * Generate a temporary ec context to use until the namespace is scanned | |
1299 | */ | |
45bea155 | 1300 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1301 | if (!ec_ecdt) |
1302 | return -ENOMEM; | |
45bea155 LY |
1303 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1304 | ||
02b28a33 LB |
1305 | init_MUTEX(&ec_ecdt->intr.sem); |
1306 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
45bea155 LY |
1307 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; |
1308 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1309 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1310 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 1311 | /* use the GL just to be safe */ |
45bea155 LY |
1312 | ec_ecdt->common.global_lock = TRUE; |
1313 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1da177e4 | 1314 | |
50526df6 LB |
1315 | status = |
1316 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
1da177e4 LT |
1317 | if (ACPI_FAILURE(status)) { |
1318 | goto error; | |
1319 | } | |
1320 | ||
1321 | return 0; | |
50526df6 | 1322 | error: |
1da177e4 LT |
1323 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1324 | kfree(ec_ecdt); | |
1325 | ec_ecdt = NULL; | |
1326 | ||
1327 | return -ENODEV; | |
1328 | } | |
1329 | ||
1330 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 1331 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 1332 | { |
50526df6 LB |
1333 | acpi_status status; |
1334 | int ret; | |
1da177e4 LT |
1335 | |
1336 | ret = acpi_ec_get_real_ecdt(); | |
1337 | /* Try to make a fake ECDT */ | |
1338 | if (ret && acpi_fake_ecdt_enabled) { | |
1339 | ret = acpi_ec_fake_ecdt(); | |
1340 | } | |
1341 | ||
1342 | if (ret) | |
1343 | return 0; | |
1344 | ||
1345 | /* | |
1346 | * Install GPE handler | |
1347 | */ | |
45bea155 | 1348 | status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 LB |
1349 | ACPI_GPE_EDGE_TRIGGERED, |
1350 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1351 | if (ACPI_FAILURE(status)) { |
1352 | goto error; | |
1353 | } | |
50526df6 LB |
1354 | acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1355 | acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR); | |
1356 | ||
1357 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1358 | ACPI_ADR_SPACE_EC, | |
1359 | &acpi_ec_space_handler, | |
1360 | &acpi_ec_space_setup, | |
1361 | ec_ecdt); | |
1da177e4 | 1362 | if (ACPI_FAILURE(status)) { |
45bea155 | 1363 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 | 1364 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1365 | goto error; |
1366 | } | |
1367 | ||
1368 | return 0; | |
1369 | ||
50526df6 | 1370 | error: |
1da177e4 LT |
1371 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1372 | kfree(ec_ecdt); | |
1373 | ec_ecdt = NULL; | |
1374 | ||
1375 | return -ENODEV; | |
1376 | } | |
1377 | ||
50526df6 | 1378 | static int __init acpi_ec_init(void) |
1da177e4 | 1379 | { |
50526df6 | 1380 | int result = 0; |
1da177e4 | 1381 | |
1da177e4 LT |
1382 | |
1383 | if (acpi_disabled) | |
d550d98d | 1384 | return 0; |
1da177e4 LT |
1385 | |
1386 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1387 | if (!acpi_ec_dir) | |
d550d98d | 1388 | return -ENODEV; |
1da177e4 LT |
1389 | |
1390 | /* Now register the driver for the EC */ | |
1391 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1392 | if (result < 0) { | |
1393 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1394 | return -ENODEV; |
1da177e4 LT |
1395 | } |
1396 | ||
d550d98d | 1397 | return result; |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | subsys_initcall(acpi_ec_init); | |
1401 | ||
1402 | /* EC driver currently not unloadable */ | |
1403 | #if 0 | |
50526df6 | 1404 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1405 | { |
1da177e4 LT |
1406 | |
1407 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1408 | ||
1409 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1410 | ||
d550d98d | 1411 | return; |
1da177e4 | 1412 | } |
50526df6 | 1413 | #endif /* 0 */ |
1da177e4 LT |
1414 | |
1415 | static int __init acpi_fake_ecdt_setup(char *str) | |
1416 | { | |
1417 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1418 | return 1; |
1da177e4 | 1419 | } |
7b15f5e7 | 1420 | |
1da177e4 | 1421 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1422 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1423 | { |
02b28a33 | 1424 | int intr; |
7b15f5e7 | 1425 | |
02b28a33 | 1426 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1427 | return 0; |
1428 | ||
02b28a33 LB |
1429 | if (intr) { |
1430 | acpi_ec_poll_mode = EC_INTR; | |
1431 | acpi_ec_driver.ops.add = acpi_ec_intr_add; | |
7b15f5e7 | 1432 | } else { |
02b28a33 LB |
1433 | acpi_ec_poll_mode = EC_POLL; |
1434 | acpi_ec_driver.ops.add = acpi_ec_poll_add; | |
7b15f5e7 | 1435 | } |
02b28a33 | 1436 | printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling"); |
9b41046c | 1437 | return 1; |
45bea155 | 1438 | } |
50526df6 | 1439 | |
53f11d4f | 1440 | __setup("ec_intr=", acpi_ec_set_intr_mode); |