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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); | |
125 | static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data); | |
126 | static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data); | |
127 | static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data); | |
128 | static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data); | |
129 | static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data); | |
130 | static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data); | |
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 LY |
215 | case ACPI_EC_EVENT_IBE: |
216 | if (~acpi_ec_read_status(ec) & event) { | |
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 | |
50526df6 | 305 | static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data) |
45bea155 | 306 | { |
02b28a33 LB |
307 | if (acpi_ec_poll_mode) |
308 | return acpi_ec_poll_read(ec, address, data); | |
45bea155 | 309 | else |
02b28a33 | 310 | return acpi_ec_intr_read(ec, address, data); |
45bea155 | 311 | } |
50526df6 | 312 | static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 313 | { |
02b28a33 LB |
314 | if (acpi_ec_poll_mode) |
315 | return acpi_ec_poll_write(ec, address, data); | |
45bea155 | 316 | else |
02b28a33 | 317 | return acpi_ec_intr_write(ec, address, data); |
45bea155 | 318 | } |
02b28a33 | 319 | static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data) |
45bea155 | 320 | { |
50526df6 LB |
321 | acpi_status status = AE_OK; |
322 | int result = 0; | |
50526df6 | 323 | u32 glk = 0; |
45bea155 | 324 | |
45bea155 LY |
325 | |
326 | if (!ec || !data) | |
d550d98d | 327 | return -EINVAL; |
45bea155 LY |
328 | |
329 | *data = 0; | |
330 | ||
331 | if (ec->common.global_lock) { | |
332 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
333 | if (ACPI_FAILURE(status)) | |
d550d98d | 334 | return -ENODEV; |
45bea155 LY |
335 | } |
336 | ||
f9a6ee1a RT |
337 | if (down_interruptible(&ec->poll.sem)) { |
338 | result = -ERESTARTSYS; | |
339 | goto end_nosem; | |
340 | } | |
341 | ||
50526df6 LB |
342 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, |
343 | &ec->common.command_addr); | |
45bea155 LY |
344 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
345 | if (result) | |
346 | goto end; | |
347 | ||
348 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); | |
349 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
350 | if (result) | |
351 | goto end; | |
352 | ||
353 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); | |
354 | ||
355 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", | |
50526df6 LB |
356 | *data, address)); |
357 | ||
358 | end: | |
f9a6ee1a RT |
359 | up(&ec->poll.sem); |
360 | end_nosem: | |
45bea155 LY |
361 | if (ec->common.global_lock) |
362 | acpi_release_global_lock(glk); | |
363 | ||
d550d98d | 364 | return result; |
45bea155 LY |
365 | } |
366 | ||
02b28a33 | 367 | static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 368 | { |
50526df6 LB |
369 | int result = 0; |
370 | acpi_status status = AE_OK; | |
50526df6 | 371 | u32 glk = 0; |
45bea155 | 372 | |
45bea155 LY |
373 | |
374 | if (!ec) | |
d550d98d | 375 | return -EINVAL; |
45bea155 LY |
376 | |
377 | if (ec->common.global_lock) { | |
378 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
379 | if (ACPI_FAILURE(status)) | |
d550d98d | 380 | return -ENODEV; |
45bea155 LY |
381 | } |
382 | ||
f9a6ee1a RT |
383 | if (down_interruptible(&ec->poll.sem)) { |
384 | result = -ERESTARTSYS; | |
385 | goto end_nosem; | |
386 | } | |
387 | ||
50526df6 LB |
388 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, |
389 | &ec->common.command_addr); | |
45bea155 LY |
390 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
391 | if (result) | |
392 | goto end; | |
393 | ||
394 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); | |
395 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
396 | if (result) | |
397 | goto end; | |
398 | ||
399 | acpi_hw_low_level_write(8, data, &ec->common.data_addr); | |
400 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
401 | if (result) | |
402 | goto end; | |
403 | ||
404 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
50526df6 | 405 | data, address)); |
45bea155 | 406 | |
50526df6 | 407 | end: |
f9a6ee1a RT |
408 | up(&ec->poll.sem); |
409 | end_nosem: | |
45bea155 LY |
410 | if (ec->common.global_lock) |
411 | acpi_release_global_lock(glk); | |
412 | ||
d550d98d | 413 | return result; |
45bea155 LY |
414 | } |
415 | ||
02b28a33 | 416 | static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data) |
1da177e4 | 417 | { |
50526df6 LB |
418 | int status = 0; |
419 | u32 glk; | |
1da177e4 | 420 | |
1da177e4 LT |
421 | |
422 | if (!ec || !data) | |
d550d98d | 423 | return -EINVAL; |
1da177e4 LT |
424 | |
425 | *data = 0; | |
426 | ||
45bea155 | 427 | if (ec->common.global_lock) { |
1da177e4 LT |
428 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
429 | if (ACPI_FAILURE(status)) | |
d550d98d | 430 | return -ENODEV; |
1da177e4 | 431 | } |
451566f4 DT |
432 | |
433 | WARN_ON(in_interrupt()); | |
02b28a33 | 434 | down(&ec->intr.sem); |
451566f4 | 435 | |
716e084e LY |
436 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
437 | if (status) { | |
1e8df53c | 438 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 439 | goto end; |
716e084e | 440 | } |
50526df6 LB |
441 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, |
442 | &ec->common.command_addr); | |
451566f4 | 443 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
451566f4 | 444 | if (status) { |
1e8df53c | 445 | printk(KERN_DEBUG PREFIX "read EC, IB not empty\n"); |
451566f4 | 446 | } |
1da177e4 | 447 | |
45bea155 | 448 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); |
50526df6 LB |
449 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
450 | if (status) { | |
1e8df53c | 451 | printk(KERN_DEBUG PREFIX "read EC, OB not full\n"); |
1da177e4 | 452 | goto end; |
451566f4 | 453 | } |
45bea155 | 454 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); |
1da177e4 | 455 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", |
50526df6 LB |
456 | *data, address)); |
457 | ||
458 | end: | |
02b28a33 | 459 | up(&ec->intr.sem); |
1da177e4 | 460 | |
45bea155 | 461 | if (ec->common.global_lock) |
1da177e4 LT |
462 | acpi_release_global_lock(glk); |
463 | ||
d550d98d | 464 | return status; |
1da177e4 LT |
465 | } |
466 | ||
02b28a33 | 467 | static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data) |
1da177e4 | 468 | { |
50526df6 LB |
469 | int status = 0; |
470 | u32 glk; | |
1da177e4 | 471 | |
1da177e4 LT |
472 | |
473 | if (!ec) | |
d550d98d | 474 | return -EINVAL; |
716e084e | 475 | |
45bea155 | 476 | if (ec->common.global_lock) { |
1da177e4 LT |
477 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
478 | if (ACPI_FAILURE(status)) | |
d550d98d | 479 | return -ENODEV; |
1da177e4 LT |
480 | } |
481 | ||
451566f4 | 482 | WARN_ON(in_interrupt()); |
02b28a33 | 483 | down(&ec->intr.sem); |
451566f4 | 484 | |
716e084e | 485 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 486 | if (status) { |
1e8df53c | 487 | printk(KERN_DEBUG PREFIX "write EC, IB not empty\n"); |
451566f4 | 488 | } |
50526df6 LB |
489 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, |
490 | &ec->common.command_addr); | |
451566f4 | 491 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
716e084e | 492 | if (status) { |
1e8df53c | 493 | printk(KERN_DEBUG PREFIX "write EC, IB not empty\n"); |
451566f4 | 494 | } |
1da177e4 | 495 | |
45bea155 | 496 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); |
451566f4 | 497 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 498 | if (status) { |
1e8df53c | 499 | printk(KERN_DEBUG PREFIX "write EC, IB not empty\n"); |
451566f4 | 500 | } |
1da177e4 | 501 | |
45bea155 | 502 | acpi_hw_low_level_write(8, data, &ec->common.data_addr); |
1da177e4 LT |
503 | |
504 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
50526df6 | 505 | data, address)); |
1da177e4 | 506 | |
02b28a33 | 507 | up(&ec->intr.sem); |
1da177e4 | 508 | |
45bea155 | 509 | if (ec->common.global_lock) |
1da177e4 LT |
510 | acpi_release_global_lock(glk); |
511 | ||
d550d98d | 512 | return status; |
1da177e4 LT |
513 | } |
514 | ||
515 | /* | |
516 | * Externally callable EC access functions. For now, assume 1 EC only | |
517 | */ | |
50526df6 | 518 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 519 | { |
45bea155 | 520 | union acpi_ec *ec; |
1da177e4 LT |
521 | int err; |
522 | u32 temp_data; | |
523 | ||
524 | if (!first_ec) | |
525 | return -ENODEV; | |
526 | ||
527 | ec = acpi_driver_data(first_ec); | |
528 | ||
529 | err = acpi_ec_read(ec, addr, &temp_data); | |
530 | ||
531 | if (!err) { | |
532 | *val = temp_data; | |
533 | return 0; | |
50526df6 | 534 | } else |
1da177e4 LT |
535 | return err; |
536 | } | |
50526df6 | 537 | |
1da177e4 LT |
538 | EXPORT_SYMBOL(ec_read); |
539 | ||
50526df6 | 540 | int ec_write(u8 addr, u8 val) |
1da177e4 | 541 | { |
45bea155 | 542 | union acpi_ec *ec; |
1da177e4 LT |
543 | int err; |
544 | ||
545 | if (!first_ec) | |
546 | return -ENODEV; | |
547 | ||
548 | ec = acpi_driver_data(first_ec); | |
549 | ||
550 | err = acpi_ec_write(ec, addr, val); | |
551 | ||
552 | return err; | |
553 | } | |
50526df6 | 554 | |
1da177e4 LT |
555 | EXPORT_SYMBOL(ec_write); |
556 | ||
50526df6 | 557 | static int acpi_ec_query(union acpi_ec *ec, u32 * data) |
45bea155 | 558 | { |
02b28a33 LB |
559 | if (acpi_ec_poll_mode) |
560 | return acpi_ec_poll_query(ec, data); | |
45bea155 | 561 | else |
02b28a33 | 562 | return acpi_ec_intr_query(ec, data); |
45bea155 | 563 | } |
02b28a33 | 564 | static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data) |
45bea155 | 565 | { |
50526df6 LB |
566 | int result = 0; |
567 | acpi_status status = AE_OK; | |
50526df6 | 568 | u32 glk = 0; |
45bea155 | 569 | |
45bea155 LY |
570 | |
571 | if (!ec || !data) | |
d550d98d | 572 | return -EINVAL; |
45bea155 LY |
573 | |
574 | *data = 0; | |
575 | ||
576 | if (ec->common.global_lock) { | |
577 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
578 | if (ACPI_FAILURE(status)) | |
d550d98d | 579 | return -ENODEV; |
45bea155 LY |
580 | } |
581 | ||
582 | /* | |
583 | * Query the EC to find out which _Qxx method we need to evaluate. | |
584 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
585 | * bit to be cleared (and thus clearing the interrupt source). | |
586 | */ | |
f9a6ee1a RT |
587 | if (down_interruptible(&ec->poll.sem)) { |
588 | result = -ERESTARTSYS; | |
589 | goto end_nosem; | |
590 | } | |
591 | ||
50526df6 LB |
592 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, |
593 | &ec->common.command_addr); | |
45bea155 LY |
594 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
595 | if (result) | |
596 | goto end; | |
597 | ||
598 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); | |
599 | if (!*data) | |
600 | result = -ENODATA; | |
601 | ||
50526df6 | 602 | end: |
f9a6ee1a RT |
603 | up(&ec->poll.sem); |
604 | end_nosem: | |
45bea155 LY |
605 | if (ec->common.global_lock) |
606 | acpi_release_global_lock(glk); | |
607 | ||
d550d98d | 608 | return result; |
45bea155 | 609 | } |
02b28a33 | 610 | static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data) |
1da177e4 | 611 | { |
50526df6 LB |
612 | int status = 0; |
613 | u32 glk; | |
1da177e4 | 614 | |
1da177e4 LT |
615 | |
616 | if (!ec || !data) | |
d550d98d | 617 | return -EINVAL; |
1da177e4 LT |
618 | *data = 0; |
619 | ||
45bea155 | 620 | if (ec->common.global_lock) { |
1da177e4 LT |
621 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
622 | if (ACPI_FAILURE(status)) | |
d550d98d | 623 | return -ENODEV; |
1da177e4 LT |
624 | } |
625 | ||
02b28a33 | 626 | down(&ec->intr.sem); |
716e084e LY |
627 | |
628 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
629 | if (status) { | |
1e8df53c | 630 | printk(KERN_DEBUG PREFIX "query EC, IB not empty\n"); |
451566f4 | 631 | goto end; |
716e084e | 632 | } |
1da177e4 LT |
633 | /* |
634 | * Query the EC to find out which _Qxx method we need to evaluate. | |
635 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
636 | * bit to be cleared (and thus clearing the interrupt source). | |
637 | */ | |
50526df6 LB |
638 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, |
639 | &ec->common.command_addr); | |
451566f4 | 640 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
50526df6 | 641 | if (status) { |
1e8df53c | 642 | printk(KERN_DEBUG PREFIX "query EC, OB not full\n"); |
1da177e4 | 643 | goto end; |
451566f4 DT |
644 | } |
645 | ||
45bea155 | 646 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); |
1da177e4 | 647 | if (!*data) |
451566f4 | 648 | status = -ENODATA; |
1da177e4 | 649 | |
50526df6 | 650 | end: |
02b28a33 | 651 | up(&ec->intr.sem); |
1da177e4 | 652 | |
45bea155 | 653 | if (ec->common.global_lock) |
1da177e4 LT |
654 | acpi_release_global_lock(glk); |
655 | ||
d550d98d | 656 | return status; |
1da177e4 LT |
657 | } |
658 | ||
1da177e4 LT |
659 | /* -------------------------------------------------------------------------- |
660 | Event Management | |
661 | -------------------------------------------------------------------------- */ | |
662 | ||
45bea155 | 663 | union acpi_ec_query_data { |
50526df6 LB |
664 | acpi_handle handle; |
665 | u8 data; | |
1da177e4 LT |
666 | }; |
667 | ||
50526df6 | 668 | static void acpi_ec_gpe_query(void *ec_cxt) |
1da177e4 | 669 | { |
02b28a33 LB |
670 | if (acpi_ec_poll_mode) |
671 | acpi_ec_gpe_poll_query(ec_cxt); | |
45bea155 | 672 | else |
02b28a33 | 673 | acpi_ec_gpe_intr_query(ec_cxt); |
45bea155 LY |
674 | } |
675 | ||
02b28a33 | 676 | static void acpi_ec_gpe_poll_query(void *ec_cxt) |
45bea155 | 677 | { |
50526df6 LB |
678 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
679 | u32 value = 0; | |
50526df6 LB |
680 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; |
681 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
682 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
683 | }; | |
45bea155 | 684 | |
45bea155 LY |
685 | |
686 | if (!ec_cxt) | |
687 | goto end; | |
688 | ||
f9a6ee1a | 689 | if (down_interruptible (&ec->poll.sem)) { |
d550d98d | 690 | return; |
f9a6ee1a | 691 | } |
45bea155 | 692 | acpi_hw_low_level_read(8, &value, &ec->common.command_addr); |
f9a6ee1a | 693 | up(&ec->poll.sem); |
45bea155 LY |
694 | |
695 | /* TBD: Implement asynch events! | |
696 | * NOTE: All we care about are EC-SCI's. Other EC events are | |
697 | * handled via polling (yuck!). This is because some systems | |
698 | * treat EC-SCIs as level (versus EDGE!) triggered, preventing | |
699 | * a purely interrupt-driven approach (grumble, grumble). | |
700 | */ | |
701 | if (!(value & ACPI_EC_FLAG_SCI)) | |
702 | goto end; | |
703 | ||
704 | if (acpi_ec_query(ec, &value)) | |
705 | goto end; | |
706 | ||
707 | object_name[2] = hex[((value >> 4) & 0x0F)]; | |
708 | object_name[3] = hex[(value & 0x0F)]; | |
709 | ||
710 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
711 | ||
712 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); | |
713 | ||
50526df6 | 714 | end: |
45bea155 LY |
715 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
716 | } | |
02b28a33 | 717 | static void acpi_ec_gpe_intr_query(void *ec_cxt) |
45bea155 | 718 | { |
50526df6 LB |
719 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
720 | u32 value; | |
721 | int result = -ENODATA; | |
722 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; | |
723 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
724 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
725 | }; | |
1da177e4 | 726 | |
1da177e4 | 727 | |
451566f4 DT |
728 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
729 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 730 | |
451566f4 | 731 | if (result) |
1da177e4 LT |
732 | goto end; |
733 | ||
1da177e4 LT |
734 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
735 | object_name[3] = hex[(value & 0x0F)]; | |
736 | ||
737 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
738 | ||
45bea155 | 739 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); |
50526df6 | 740 | end: |
02b28a33 | 741 | atomic_dec(&ec->intr.pending_gpe); |
451566f4 | 742 | return; |
1da177e4 LT |
743 | } |
744 | ||
50526df6 | 745 | static u32 acpi_ec_gpe_handler(void *data) |
45bea155 | 746 | { |
02b28a33 LB |
747 | if (acpi_ec_poll_mode) |
748 | return acpi_ec_gpe_poll_handler(data); | |
45bea155 | 749 | else |
02b28a33 | 750 | return acpi_ec_gpe_intr_handler(data); |
45bea155 | 751 | } |
02b28a33 | 752 | static u32 acpi_ec_gpe_poll_handler(void *data) |
45bea155 | 753 | { |
50526df6 LB |
754 | acpi_status status = AE_OK; |
755 | union acpi_ec *ec = (union acpi_ec *)data; | |
45bea155 LY |
756 | |
757 | if (!ec) | |
758 | return ACPI_INTERRUPT_NOT_HANDLED; | |
759 | ||
760 | acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); | |
761 | ||
b8d35192 | 762 | status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec); |
45bea155 LY |
763 | |
764 | if (status == AE_OK) | |
765 | return ACPI_INTERRUPT_HANDLED; | |
766 | else | |
767 | return ACPI_INTERRUPT_NOT_HANDLED; | |
768 | } | |
02b28a33 | 769 | static u32 acpi_ec_gpe_intr_handler(void *data) |
1da177e4 | 770 | { |
50526df6 LB |
771 | acpi_status status = AE_OK; |
772 | u32 value; | |
773 | union acpi_ec *ec = (union acpi_ec *)data; | |
1da177e4 LT |
774 | |
775 | if (!ec) | |
776 | return ACPI_INTERRUPT_NOT_HANDLED; | |
777 | ||
716e084e | 778 | acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 779 | value = acpi_ec_read_status(ec); |
1da177e4 | 780 | |
02b28a33 | 781 | switch (ec->intr.expect_event) { |
716e084e LY |
782 | case ACPI_EC_EVENT_OBF: |
783 | if (!(value & ACPI_EC_FLAG_OBF)) | |
784 | break; | |
785 | case ACPI_EC_EVENT_IBE: | |
786 | if ((value & ACPI_EC_FLAG_IBF)) | |
787 | break; | |
02b28a33 LB |
788 | ec->intr.expect_event = 0; |
789 | wake_up(&ec->intr.wait); | |
716e084e LY |
790 | return ACPI_INTERRUPT_HANDLED; |
791 | default: | |
792 | break; | |
451566f4 DT |
793 | } |
794 | ||
50526df6 | 795 | if (value & ACPI_EC_FLAG_SCI) { |
02b28a33 | 796 | atomic_add(1, &ec->intr.pending_gpe); |
b8d35192 | 797 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, |
50526df6 | 798 | acpi_ec_gpe_query, ec); |
17e9c78a | 799 | return status == AE_OK ? |
50526df6 LB |
800 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
801 | } | |
45bea155 | 802 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 803 | return status == AE_OK ? |
50526df6 | 804 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
805 | } |
806 | ||
807 | /* -------------------------------------------------------------------------- | |
808 | Address Space Management | |
809 | -------------------------------------------------------------------------- */ | |
810 | ||
811 | static acpi_status | |
50526df6 LB |
812 | acpi_ec_space_setup(acpi_handle region_handle, |
813 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
814 | { |
815 | /* | |
816 | * The EC object is in the handler context and is needed | |
817 | * when calling the acpi_ec_space_handler. | |
818 | */ | |
50526df6 LB |
819 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
820 | handler_context : NULL; | |
1da177e4 LT |
821 | |
822 | return AE_OK; | |
823 | } | |
824 | ||
1da177e4 | 825 | static acpi_status |
50526df6 LB |
826 | acpi_ec_space_handler(u32 function, |
827 | acpi_physical_address address, | |
828 | u32 bit_width, | |
829 | acpi_integer * value, | |
830 | void *handler_context, void *region_context) | |
1da177e4 | 831 | { |
50526df6 LB |
832 | int result = 0; |
833 | union acpi_ec *ec = NULL; | |
834 | u64 temp = *value; | |
835 | acpi_integer f_v = 0; | |
836 | int i = 0; | |
1da177e4 | 837 | |
1da177e4 LT |
838 | |
839 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 840 | return AE_BAD_PARAMETER; |
1da177e4 | 841 | |
fa9cd547 | 842 | if (bit_width != 8 && acpi_strict) { |
50526df6 LB |
843 | printk(KERN_WARNING PREFIX |
844 | "acpi_ec_space_handler: bit_width should be 8\n"); | |
d550d98d | 845 | return AE_BAD_PARAMETER; |
1da177e4 LT |
846 | } |
847 | ||
50526df6 | 848 | ec = (union acpi_ec *)handler_context; |
1da177e4 | 849 | |
50526df6 | 850 | next_byte: |
1da177e4 LT |
851 | switch (function) { |
852 | case ACPI_READ: | |
fa9cd547 | 853 | temp = 0; |
50526df6 | 854 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
855 | break; |
856 | case ACPI_WRITE: | |
fa9cd547 | 857 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
858 | break; |
859 | default: | |
860 | result = -EINVAL; | |
861 | goto out; | |
862 | break; | |
863 | } | |
864 | ||
865 | bit_width -= 8; | |
fa9cd547 LY |
866 | if (bit_width) { |
867 | if (function == ACPI_READ) | |
868 | f_v |= temp << 8 * i; | |
869 | if (function == ACPI_WRITE) | |
870 | temp >>= 8; | |
1da177e4 | 871 | i++; |
83ea7445 | 872 | address++; |
1da177e4 LT |
873 | goto next_byte; |
874 | } | |
875 | ||
fa9cd547 LY |
876 | if (function == ACPI_READ) { |
877 | f_v |= temp << 8 * i; | |
1da177e4 LT |
878 | *value = f_v; |
879 | } | |
880 | ||
50526df6 | 881 | out: |
1da177e4 LT |
882 | switch (result) { |
883 | case -EINVAL: | |
d550d98d | 884 | return AE_BAD_PARAMETER; |
1da177e4 LT |
885 | break; |
886 | case -ENODEV: | |
d550d98d | 887 | return AE_NOT_FOUND; |
1da177e4 LT |
888 | break; |
889 | case -ETIME: | |
d550d98d | 890 | return AE_TIME; |
1da177e4 LT |
891 | break; |
892 | default: | |
d550d98d | 893 | return AE_OK; |
1da177e4 | 894 | } |
1da177e4 LT |
895 | } |
896 | ||
1da177e4 LT |
897 | /* -------------------------------------------------------------------------- |
898 | FS Interface (/proc) | |
899 | -------------------------------------------------------------------------- */ | |
900 | ||
50526df6 | 901 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 902 | |
50526df6 | 903 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 904 | { |
50526df6 | 905 | union acpi_ec *ec = (union acpi_ec *)seq->private; |
1da177e4 | 906 | |
1da177e4 LT |
907 | |
908 | if (!ec) | |
909 | goto end; | |
910 | ||
911 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
50526df6 | 912 | (u32) ec->common.gpe_bit); |
1da177e4 | 913 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
50526df6 LB |
914 | (u32) ec->common.status_addr.address, |
915 | (u32) ec->common.data_addr.address); | |
1da177e4 | 916 | seq_printf(seq, "use global lock: %s\n", |
50526df6 | 917 | ec->common.global_lock ? "yes" : "no"); |
45bea155 | 918 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 919 | |
50526df6 | 920 | end: |
d550d98d | 921 | return 0; |
1da177e4 LT |
922 | } |
923 | ||
924 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
925 | { | |
926 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
927 | } | |
928 | ||
929 | static struct file_operations acpi_ec_info_ops = { | |
50526df6 LB |
930 | .open = acpi_ec_info_open_fs, |
931 | .read = seq_read, | |
932 | .llseek = seq_lseek, | |
933 | .release = single_release, | |
1da177e4 LT |
934 | .owner = THIS_MODULE, |
935 | }; | |
936 | ||
50526df6 | 937 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 938 | { |
50526df6 | 939 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 940 | |
1da177e4 LT |
941 | |
942 | if (!acpi_device_dir(device)) { | |
943 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 944 | acpi_ec_dir); |
1da177e4 | 945 | if (!acpi_device_dir(device)) |
d550d98d | 946 | return -ENODEV; |
1da177e4 LT |
947 | } |
948 | ||
949 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 950 | acpi_device_dir(device)); |
1da177e4 | 951 | if (!entry) |
d550d98d | 952 | return -ENODEV; |
1da177e4 LT |
953 | else { |
954 | entry->proc_fops = &acpi_ec_info_ops; | |
955 | entry->data = acpi_driver_data(device); | |
956 | entry->owner = THIS_MODULE; | |
957 | } | |
958 | ||
d550d98d | 959 | return 0; |
1da177e4 LT |
960 | } |
961 | ||
50526df6 | 962 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 963 | { |
1da177e4 LT |
964 | |
965 | if (acpi_device_dir(device)) { | |
966 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
967 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
968 | acpi_device_dir(device) = NULL; | |
969 | } | |
970 | ||
d550d98d | 971 | return 0; |
1da177e4 LT |
972 | } |
973 | ||
1da177e4 LT |
974 | /* -------------------------------------------------------------------------- |
975 | Driver Interface | |
976 | -------------------------------------------------------------------------- */ | |
977 | ||
02b28a33 | 978 | static int acpi_ec_poll_add(struct acpi_device *device) |
1da177e4 | 979 | { |
50526df6 LB |
980 | int result = 0; |
981 | acpi_status status = AE_OK; | |
982 | union acpi_ec *ec = NULL; | |
45bea155 | 983 | |
45bea155 LY |
984 | |
985 | if (!device) | |
d550d98d | 986 | return -EINVAL; |
45bea155 LY |
987 | |
988 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
989 | if (!ec) | |
d550d98d | 990 | return -ENOMEM; |
45bea155 LY |
991 | memset(ec, 0, sizeof(union acpi_ec)); |
992 | ||
993 | ec->common.handle = device->handle; | |
994 | ec->common.uid = -1; | |
f9a6ee1a | 995 | init_MUTEX(&ec->poll.sem); |
45bea155 LY |
996 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
997 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
998 | acpi_driver_data(device) = ec; | |
999 | ||
1000 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1001 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1002 | &ec->common.global_lock); | |
45bea155 | 1003 | |
ff2fc3e9 JS |
1004 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
1005 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
1006 | if (ec_ecdt) { | |
45bea155 | 1007 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
1008 | ACPI_ADR_SPACE_EC, |
1009 | &acpi_ec_space_handler); | |
1010 | ||
1011 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, | |
1012 | &acpi_ec_gpe_handler); | |
45bea155 LY |
1013 | |
1014 | kfree(ec_ecdt); | |
1015 | } | |
1016 | ||
1017 | /* Get GPE bit assignment (EC events). */ | |
1018 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1019 | status = |
1020 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1021 | &ec->common.gpe_bit); | |
45bea155 | 1022 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 1023 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit")); |
45bea155 LY |
1024 | result = -ENODEV; |
1025 | goto end; | |
1026 | } | |
1027 | ||
1028 | result = acpi_ec_add_fs(device); | |
1029 | if (result) | |
1030 | goto end; | |
1031 | ||
02b28a33 | 1032 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n", |
50526df6 LB |
1033 | acpi_device_name(device), acpi_device_bid(device), |
1034 | (u32) ec->common.gpe_bit); | |
45bea155 LY |
1035 | |
1036 | if (!first_ec) | |
1037 | first_ec = device; | |
1038 | ||
50526df6 | 1039 | end: |
45bea155 LY |
1040 | if (result) |
1041 | kfree(ec); | |
1042 | ||
d550d98d | 1043 | return result; |
45bea155 | 1044 | } |
02b28a33 | 1045 | static int acpi_ec_intr_add(struct acpi_device *device) |
45bea155 | 1046 | { |
50526df6 LB |
1047 | int result = 0; |
1048 | acpi_status status = AE_OK; | |
1049 | union acpi_ec *ec = NULL; | |
1da177e4 | 1050 | |
1da177e4 LT |
1051 | |
1052 | if (!device) | |
d550d98d | 1053 | return -EINVAL; |
1da177e4 | 1054 | |
45bea155 | 1055 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 | 1056 | if (!ec) |
d550d98d | 1057 | return -ENOMEM; |
45bea155 LY |
1058 | memset(ec, 0, sizeof(union acpi_ec)); |
1059 | ||
1060 | ec->common.handle = device->handle; | |
1061 | ec->common.uid = -1; | |
02b28a33 LB |
1062 | atomic_set(&ec->intr.pending_gpe, 0); |
1063 | atomic_set(&ec->intr.leaving_burst, 1); | |
1064 | init_MUTEX(&ec->intr.sem); | |
1065 | init_waitqueue_head(&ec->intr.wait); | |
1da177e4 LT |
1066 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1067 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1068 | acpi_driver_data(device) = ec; | |
1069 | ||
1070 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1071 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1072 | &ec->common.global_lock); | |
1da177e4 | 1073 | |
ff2fc3e9 JS |
1074 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
1075 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
1076 | if (ec_ecdt) { | |
1da177e4 | 1077 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
1078 | ACPI_ADR_SPACE_EC, |
1079 | &acpi_ec_space_handler); | |
451566f4 | 1080 | |
50526df6 LB |
1081 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
1082 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
1083 | |
1084 | kfree(ec_ecdt); | |
1085 | } | |
1086 | ||
1087 | /* Get GPE bit assignment (EC events). */ | |
1088 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1089 | status = |
1090 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1091 | &ec->common.gpe_bit); | |
1da177e4 | 1092 | if (ACPI_FAILURE(status)) { |
6468463a | 1093 | printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n"); |
1da177e4 LT |
1094 | result = -ENODEV; |
1095 | goto end; | |
1096 | } | |
1097 | ||
1098 | result = acpi_ec_add_fs(device); | |
1099 | if (result) | |
1100 | goto end; | |
1101 | ||
02b28a33 | 1102 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n", |
50526df6 LB |
1103 | acpi_device_name(device), acpi_device_bid(device), |
1104 | (u32) ec->common.gpe_bit); | |
1da177e4 LT |
1105 | |
1106 | if (!first_ec) | |
1107 | first_ec = device; | |
1108 | ||
50526df6 | 1109 | end: |
1da177e4 LT |
1110 | if (result) |
1111 | kfree(ec); | |
1112 | ||
d550d98d | 1113 | return result; |
1da177e4 LT |
1114 | } |
1115 | ||
50526df6 | 1116 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 1117 | { |
50526df6 | 1118 | union acpi_ec *ec = NULL; |
1da177e4 | 1119 | |
1da177e4 LT |
1120 | |
1121 | if (!device) | |
d550d98d | 1122 | return -EINVAL; |
1da177e4 LT |
1123 | |
1124 | ec = acpi_driver_data(device); | |
1125 | ||
1126 | acpi_ec_remove_fs(device); | |
1127 | ||
1128 | kfree(ec); | |
1129 | ||
d550d98d | 1130 | return 0; |
1da177e4 LT |
1131 | } |
1132 | ||
1da177e4 | 1133 | static acpi_status |
50526df6 | 1134 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1135 | { |
50526df6 | 1136 | union acpi_ec *ec = (union acpi_ec *)context; |
1da177e4 LT |
1137 | struct acpi_generic_address *addr; |
1138 | ||
50eca3eb | 1139 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
1140 | return AE_OK; |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * The first address region returned is the data port, and | |
1145 | * the second address region returned is the status/command | |
1146 | * port. | |
1147 | */ | |
45bea155 LY |
1148 | if (ec->common.data_addr.register_bit_width == 0) { |
1149 | addr = &ec->common.data_addr; | |
1150 | } else if (ec->common.command_addr.register_bit_width == 0) { | |
1151 | addr = &ec->common.command_addr; | |
1da177e4 LT |
1152 | } else { |
1153 | return AE_CTRL_TERMINATE; | |
1154 | } | |
1155 | ||
1156 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
1157 | addr->register_bit_width = 8; | |
1158 | addr->register_bit_offset = 0; | |
50eca3eb | 1159 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
1160 | |
1161 | return AE_OK; | |
1162 | } | |
1163 | ||
50526df6 | 1164 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 1165 | { |
50526df6 LB |
1166 | acpi_status status = AE_OK; |
1167 | union acpi_ec *ec = NULL; | |
1da177e4 | 1168 | |
1da177e4 LT |
1169 | |
1170 | if (!device) | |
d550d98d | 1171 | return -EINVAL; |
1da177e4 LT |
1172 | |
1173 | ec = acpi_driver_data(device); | |
1174 | ||
1175 | if (!ec) | |
d550d98d | 1176 | return -EINVAL; |
1da177e4 LT |
1177 | |
1178 | /* | |
1179 | * Get I/O port addresses. Convert to GAS format. | |
1180 | */ | |
45bea155 | 1181 | status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS, |
50526df6 LB |
1182 | acpi_ec_io_ports, ec); |
1183 | if (ACPI_FAILURE(status) | |
1184 | || ec->common.command_addr.register_bit_width == 0) { | |
6468463a | 1185 | printk(KERN_ERR PREFIX "Error getting I/O port addresses\n"); |
d550d98d | 1186 | return -ENODEV; |
1da177e4 LT |
1187 | } |
1188 | ||
45bea155 | 1189 | ec->common.status_addr = ec->common.command_addr; |
1da177e4 LT |
1190 | |
1191 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
50526df6 LB |
1192 | (u32) ec->common.gpe_bit, |
1193 | (u32) ec->common.command_addr.address, | |
1194 | (u32) ec->common.data_addr.address)); | |
1da177e4 LT |
1195 | |
1196 | /* | |
1197 | * Install GPE handler | |
1198 | */ | |
45bea155 | 1199 | status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit, |
50526df6 LB |
1200 | ACPI_GPE_EDGE_TRIGGERED, |
1201 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 1202 | if (ACPI_FAILURE(status)) { |
d550d98d | 1203 | return -ENODEV; |
1da177e4 | 1204 | } |
50526df6 LB |
1205 | acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1206 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 1207 | |
50526df6 LB |
1208 | status = acpi_install_address_space_handler(ec->common.handle, |
1209 | ACPI_ADR_SPACE_EC, | |
1210 | &acpi_ec_space_handler, | |
1211 | &acpi_ec_space_setup, ec); | |
1da177e4 | 1212 | if (ACPI_FAILURE(status)) { |
50526df6 LB |
1213 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, |
1214 | &acpi_ec_gpe_handler); | |
d550d98d | 1215 | return -ENODEV; |
1da177e4 LT |
1216 | } |
1217 | ||
d550d98d | 1218 | return AE_OK; |
1da177e4 LT |
1219 | } |
1220 | ||
50526df6 | 1221 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 1222 | { |
50526df6 LB |
1223 | acpi_status status = AE_OK; |
1224 | union acpi_ec *ec = NULL; | |
1da177e4 | 1225 | |
1da177e4 LT |
1226 | |
1227 | if (!device) | |
d550d98d | 1228 | return -EINVAL; |
1da177e4 LT |
1229 | |
1230 | ec = acpi_driver_data(device); | |
1231 | ||
45bea155 | 1232 | status = acpi_remove_address_space_handler(ec->common.handle, |
50526df6 LB |
1233 | ACPI_ADR_SPACE_EC, |
1234 | &acpi_ec_space_handler); | |
1da177e4 | 1235 | if (ACPI_FAILURE(status)) |
d550d98d | 1236 | return -ENODEV; |
1da177e4 | 1237 | |
50526df6 LB |
1238 | status = |
1239 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, | |
1240 | &acpi_ec_gpe_handler); | |
1da177e4 | 1241 | if (ACPI_FAILURE(status)) |
d550d98d | 1242 | return -ENODEV; |
1da177e4 | 1243 | |
d550d98d | 1244 | return 0; |
1da177e4 LT |
1245 | } |
1246 | ||
1247 | static acpi_status __init | |
50526df6 LB |
1248 | acpi_fake_ecdt_callback(acpi_handle handle, |
1249 | u32 Level, void *context, void **retval) | |
1da177e4 | 1250 | { |
45bea155 | 1251 | |
02b28a33 LB |
1252 | if (acpi_ec_poll_mode) |
1253 | return acpi_fake_ecdt_poll_callback(handle, | |
50526df6 | 1254 | Level, context, retval); |
45bea155 | 1255 | else |
02b28a33 | 1256 | return acpi_fake_ecdt_intr_callback(handle, |
50526df6 | 1257 | Level, context, retval); |
45bea155 LY |
1258 | } |
1259 | ||
1260 | static acpi_status __init | |
02b28a33 | 1261 | acpi_fake_ecdt_poll_callback(acpi_handle handle, |
50526df6 | 1262 | u32 Level, void *context, void **retval) |
45bea155 | 1263 | { |
50526df6 | 1264 | acpi_status status; |
45bea155 LY |
1265 | |
1266 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
50526df6 | 1267 | acpi_ec_io_ports, ec_ecdt); |
45bea155 LY |
1268 | if (ACPI_FAILURE(status)) |
1269 | return status; | |
1270 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; | |
1271 | ||
1272 | ec_ecdt->common.uid = -1; | |
1273 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1274 | ||
50526df6 LB |
1275 | status = |
1276 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1277 | &ec_ecdt->common.gpe_bit); | |
45bea155 LY |
1278 | if (ACPI_FAILURE(status)) |
1279 | return status; | |
f9a6ee1a | 1280 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1281 | ec_ecdt->common.global_lock = TRUE; |
1282 | ec_ecdt->common.handle = handle; | |
1283 | ||
50526df6 LB |
1284 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1285 | (u32) ec_ecdt->common.gpe_bit, | |
1286 | (u32) ec_ecdt->common.command_addr.address, | |
1287 | (u32) ec_ecdt->common.data_addr.address); | |
45bea155 LY |
1288 | |
1289 | return AE_CTRL_TERMINATE; | |
1290 | } | |
1291 | ||
1292 | static acpi_status __init | |
02b28a33 | 1293 | acpi_fake_ecdt_intr_callback(acpi_handle handle, |
50526df6 | 1294 | u32 Level, void *context, void **retval) |
45bea155 | 1295 | { |
50526df6 | 1296 | acpi_status status; |
1da177e4 | 1297 | |
02b28a33 LB |
1298 | init_MUTEX(&ec_ecdt->intr.sem); |
1299 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
1da177e4 | 1300 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 1301 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
1302 | if (ACPI_FAILURE(status)) |
1303 | return status; | |
45bea155 | 1304 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; |
1da177e4 | 1305 | |
45bea155 LY |
1306 | ec_ecdt->common.uid = -1; |
1307 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1da177e4 | 1308 | |
50526df6 LB |
1309 | status = |
1310 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1311 | &ec_ecdt->common.gpe_bit); | |
1da177e4 LT |
1312 | if (ACPI_FAILURE(status)) |
1313 | return status; | |
45bea155 LY |
1314 | ec_ecdt->common.global_lock = TRUE; |
1315 | ec_ecdt->common.handle = handle; | |
1da177e4 | 1316 | |
50526df6 LB |
1317 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1318 | (u32) ec_ecdt->common.gpe_bit, | |
1319 | (u32) ec_ecdt->common.command_addr.address, | |
1320 | (u32) ec_ecdt->common.data_addr.address); | |
1da177e4 LT |
1321 | |
1322 | return AE_CTRL_TERMINATE; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1327 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1328 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1329 | * required, but if EC regison is accessed early, it is required. | |
1330 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1331 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1332 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1333 | * all systems found. | |
1334 | */ | |
50526df6 | 1335 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 1336 | { |
50526df6 LB |
1337 | acpi_status status; |
1338 | int ret = 0; | |
1da177e4 LT |
1339 | |
1340 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1341 | ||
45bea155 | 1342 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1343 | if (!ec_ecdt) { |
1344 | ret = -ENOMEM; | |
1345 | goto error; | |
1346 | } | |
45bea155 | 1347 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1da177e4 | 1348 | |
50526df6 LB |
1349 | status = acpi_get_devices(ACPI_EC_HID, |
1350 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
1351 | if (ACPI_FAILURE(status)) { |
1352 | kfree(ec_ecdt); | |
1353 | ec_ecdt = NULL; | |
1354 | ret = -ENODEV; | |
1355 | goto error; | |
1356 | } | |
1357 | return 0; | |
50526df6 | 1358 | error: |
1da177e4 LT |
1359 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
1360 | return ret; | |
1361 | } | |
1362 | ||
50526df6 | 1363 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 1364 | { |
02b28a33 LB |
1365 | if (acpi_ec_poll_mode) |
1366 | return acpi_ec_poll_get_real_ecdt(); | |
45bea155 | 1367 | else |
02b28a33 | 1368 | return acpi_ec_intr_get_real_ecdt(); |
45bea155 LY |
1369 | } |
1370 | ||
02b28a33 | 1371 | static int __init acpi_ec_poll_get_real_ecdt(void) |
45bea155 | 1372 | { |
50526df6 LB |
1373 | acpi_status status; |
1374 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 1375 | |
50526df6 LB |
1376 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1377 | (struct acpi_table_header **) | |
1378 | &ecdt_ptr); | |
45bea155 LY |
1379 | if (ACPI_FAILURE(status)) |
1380 | return -ENODEV; | |
1381 | ||
1382 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1383 | ||
1384 | /* | |
1385 | * Generate a temporary ec context to use until the namespace is scanned | |
1386 | */ | |
1387 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
1388 | if (!ec_ecdt) | |
1389 | return -ENOMEM; | |
1390 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); | |
1391 | ||
1392 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; | |
1393 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1394 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1395 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
f9a6ee1a | 1396 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1397 | /* use the GL just to be safe */ |
1398 | ec_ecdt->common.global_lock = TRUE; | |
1399 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1400 | ||
50526df6 LB |
1401 | status = |
1402 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
45bea155 LY |
1403 | if (ACPI_FAILURE(status)) { |
1404 | goto error; | |
1405 | } | |
1406 | ||
1407 | return 0; | |
50526df6 | 1408 | error: |
45bea155 LY |
1409 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1410 | kfree(ec_ecdt); | |
1411 | ec_ecdt = NULL; | |
1412 | ||
1413 | return -ENODEV; | |
1414 | } | |
1415 | ||
02b28a33 | 1416 | static int __init acpi_ec_intr_get_real_ecdt(void) |
1da177e4 | 1417 | { |
50526df6 LB |
1418 | acpi_status status; |
1419 | struct acpi_table_ecdt *ecdt_ptr; | |
1da177e4 | 1420 | |
451566f4 | 1421 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
50526df6 LB |
1422 | (struct acpi_table_header **) |
1423 | &ecdt_ptr); | |
1da177e4 LT |
1424 | if (ACPI_FAILURE(status)) |
1425 | return -ENODEV; | |
1426 | ||
1427 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1428 | ||
1429 | /* | |
1430 | * Generate a temporary ec context to use until the namespace is scanned | |
1431 | */ | |
45bea155 | 1432 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1433 | if (!ec_ecdt) |
1434 | return -ENOMEM; | |
45bea155 LY |
1435 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1436 | ||
02b28a33 LB |
1437 | init_MUTEX(&ec_ecdt->intr.sem); |
1438 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
45bea155 LY |
1439 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; |
1440 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1441 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1442 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 1443 | /* use the GL just to be safe */ |
45bea155 LY |
1444 | ec_ecdt->common.global_lock = TRUE; |
1445 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1da177e4 | 1446 | |
50526df6 LB |
1447 | status = |
1448 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
1da177e4 LT |
1449 | if (ACPI_FAILURE(status)) { |
1450 | goto error; | |
1451 | } | |
1452 | ||
1453 | return 0; | |
50526df6 | 1454 | error: |
1da177e4 LT |
1455 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1456 | kfree(ec_ecdt); | |
1457 | ec_ecdt = NULL; | |
1458 | ||
1459 | return -ENODEV; | |
1460 | } | |
1461 | ||
1462 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 1463 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 1464 | { |
50526df6 LB |
1465 | acpi_status status; |
1466 | int ret; | |
1da177e4 LT |
1467 | |
1468 | ret = acpi_ec_get_real_ecdt(); | |
1469 | /* Try to make a fake ECDT */ | |
1470 | if (ret && acpi_fake_ecdt_enabled) { | |
1471 | ret = acpi_ec_fake_ecdt(); | |
1472 | } | |
1473 | ||
1474 | if (ret) | |
1475 | return 0; | |
1476 | ||
1477 | /* | |
1478 | * Install GPE handler | |
1479 | */ | |
45bea155 | 1480 | status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 LB |
1481 | ACPI_GPE_EDGE_TRIGGERED, |
1482 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1483 | if (ACPI_FAILURE(status)) { |
1484 | goto error; | |
1485 | } | |
50526df6 LB |
1486 | acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1487 | acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR); | |
1488 | ||
1489 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1490 | ACPI_ADR_SPACE_EC, | |
1491 | &acpi_ec_space_handler, | |
1492 | &acpi_ec_space_setup, | |
1493 | ec_ecdt); | |
1da177e4 | 1494 | if (ACPI_FAILURE(status)) { |
45bea155 | 1495 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 | 1496 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1497 | goto error; |
1498 | } | |
1499 | ||
1500 | return 0; | |
1501 | ||
50526df6 | 1502 | error: |
1da177e4 LT |
1503 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1504 | kfree(ec_ecdt); | |
1505 | ec_ecdt = NULL; | |
1506 | ||
1507 | return -ENODEV; | |
1508 | } | |
1509 | ||
50526df6 | 1510 | static int __init acpi_ec_init(void) |
1da177e4 | 1511 | { |
50526df6 | 1512 | int result = 0; |
1da177e4 | 1513 | |
1da177e4 LT |
1514 | |
1515 | if (acpi_disabled) | |
d550d98d | 1516 | return 0; |
1da177e4 LT |
1517 | |
1518 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1519 | if (!acpi_ec_dir) | |
d550d98d | 1520 | return -ENODEV; |
1da177e4 LT |
1521 | |
1522 | /* Now register the driver for the EC */ | |
1523 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1524 | if (result < 0) { | |
1525 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1526 | return -ENODEV; |
1da177e4 LT |
1527 | } |
1528 | ||
d550d98d | 1529 | return result; |
1da177e4 LT |
1530 | } |
1531 | ||
1532 | subsys_initcall(acpi_ec_init); | |
1533 | ||
1534 | /* EC driver currently not unloadable */ | |
1535 | #if 0 | |
50526df6 | 1536 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1537 | { |
1da177e4 LT |
1538 | |
1539 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1540 | ||
1541 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1542 | ||
d550d98d | 1543 | return; |
1da177e4 | 1544 | } |
50526df6 | 1545 | #endif /* 0 */ |
1da177e4 LT |
1546 | |
1547 | static int __init acpi_fake_ecdt_setup(char *str) | |
1548 | { | |
1549 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1550 | return 1; |
1da177e4 | 1551 | } |
7b15f5e7 | 1552 | |
1da177e4 | 1553 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1554 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1555 | { |
02b28a33 | 1556 | int intr; |
7b15f5e7 | 1557 | |
02b28a33 | 1558 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1559 | return 0; |
1560 | ||
02b28a33 LB |
1561 | if (intr) { |
1562 | acpi_ec_poll_mode = EC_INTR; | |
1563 | acpi_ec_driver.ops.add = acpi_ec_intr_add; | |
7b15f5e7 | 1564 | } else { |
02b28a33 LB |
1565 | acpi_ec_poll_mode = EC_POLL; |
1566 | acpi_ec_driver.ops.add = acpi_ec_poll_add; | |
7b15f5e7 | 1567 | } |
02b28a33 | 1568 | printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling"); |
9b41046c | 1569 | return 1; |
45bea155 | 1570 | } |
50526df6 | 1571 | |
53f11d4f | 1572 | __setup("ec_intr=", acpi_ec_set_intr_mode); |