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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 | 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 | |
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; | |
49fee981 VL |
785 | ec->intr.expect_event = 0; |
786 | wake_up(&ec->intr.wait); | |
787 | break; | |
716e084e LY |
788 | case ACPI_EC_EVENT_IBE: |
789 | if ((value & ACPI_EC_FLAG_IBF)) | |
790 | break; | |
02b28a33 LB |
791 | ec->intr.expect_event = 0; |
792 | wake_up(&ec->intr.wait); | |
49fee981 | 793 | break; |
716e084e LY |
794 | default: |
795 | break; | |
451566f4 DT |
796 | } |
797 | ||
50526df6 | 798 | if (value & ACPI_EC_FLAG_SCI) { |
02b28a33 | 799 | atomic_add(1, &ec->intr.pending_gpe); |
b8d35192 | 800 | status = acpi_os_execute(OSL_EC_BURST_HANDLER, |
50526df6 | 801 | acpi_ec_gpe_query, ec); |
17e9c78a | 802 | return status == AE_OK ? |
50526df6 LB |
803 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
804 | } | |
45bea155 | 805 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 806 | return status == AE_OK ? |
50526df6 | 807 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
808 | } |
809 | ||
810 | /* -------------------------------------------------------------------------- | |
811 | Address Space Management | |
812 | -------------------------------------------------------------------------- */ | |
813 | ||
814 | static acpi_status | |
50526df6 LB |
815 | acpi_ec_space_setup(acpi_handle region_handle, |
816 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
817 | { |
818 | /* | |
819 | * The EC object is in the handler context and is needed | |
820 | * when calling the acpi_ec_space_handler. | |
821 | */ | |
50526df6 LB |
822 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
823 | handler_context : NULL; | |
1da177e4 LT |
824 | |
825 | return AE_OK; | |
826 | } | |
827 | ||
1da177e4 | 828 | static acpi_status |
50526df6 LB |
829 | acpi_ec_space_handler(u32 function, |
830 | acpi_physical_address address, | |
831 | u32 bit_width, | |
832 | acpi_integer * value, | |
833 | void *handler_context, void *region_context) | |
1da177e4 | 834 | { |
50526df6 LB |
835 | int result = 0; |
836 | union acpi_ec *ec = NULL; | |
837 | u64 temp = *value; | |
838 | acpi_integer f_v = 0; | |
839 | int i = 0; | |
1da177e4 | 840 | |
1da177e4 LT |
841 | |
842 | if ((address > 0xFF) || !value || !handler_context) | |
d550d98d | 843 | return AE_BAD_PARAMETER; |
1da177e4 | 844 | |
fa9cd547 | 845 | if (bit_width != 8 && acpi_strict) { |
50526df6 LB |
846 | printk(KERN_WARNING PREFIX |
847 | "acpi_ec_space_handler: bit_width should be 8\n"); | |
d550d98d | 848 | return AE_BAD_PARAMETER; |
1da177e4 LT |
849 | } |
850 | ||
50526df6 | 851 | ec = (union acpi_ec *)handler_context; |
1da177e4 | 852 | |
50526df6 | 853 | next_byte: |
1da177e4 LT |
854 | switch (function) { |
855 | case ACPI_READ: | |
fa9cd547 | 856 | temp = 0; |
50526df6 | 857 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
858 | break; |
859 | case ACPI_WRITE: | |
fa9cd547 | 860 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
861 | break; |
862 | default: | |
863 | result = -EINVAL; | |
864 | goto out; | |
865 | break; | |
866 | } | |
867 | ||
868 | bit_width -= 8; | |
fa9cd547 LY |
869 | if (bit_width) { |
870 | if (function == ACPI_READ) | |
871 | f_v |= temp << 8 * i; | |
872 | if (function == ACPI_WRITE) | |
873 | temp >>= 8; | |
1da177e4 | 874 | i++; |
83ea7445 | 875 | address++; |
1da177e4 LT |
876 | goto next_byte; |
877 | } | |
878 | ||
fa9cd547 LY |
879 | if (function == ACPI_READ) { |
880 | f_v |= temp << 8 * i; | |
1da177e4 LT |
881 | *value = f_v; |
882 | } | |
883 | ||
50526df6 | 884 | out: |
1da177e4 LT |
885 | switch (result) { |
886 | case -EINVAL: | |
d550d98d | 887 | return AE_BAD_PARAMETER; |
1da177e4 LT |
888 | break; |
889 | case -ENODEV: | |
d550d98d | 890 | return AE_NOT_FOUND; |
1da177e4 LT |
891 | break; |
892 | case -ETIME: | |
d550d98d | 893 | return AE_TIME; |
1da177e4 LT |
894 | break; |
895 | default: | |
d550d98d | 896 | return AE_OK; |
1da177e4 | 897 | } |
1da177e4 LT |
898 | } |
899 | ||
1da177e4 LT |
900 | /* -------------------------------------------------------------------------- |
901 | FS Interface (/proc) | |
902 | -------------------------------------------------------------------------- */ | |
903 | ||
50526df6 | 904 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 905 | |
50526df6 | 906 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 907 | { |
50526df6 | 908 | union acpi_ec *ec = (union acpi_ec *)seq->private; |
1da177e4 | 909 | |
1da177e4 LT |
910 | |
911 | if (!ec) | |
912 | goto end; | |
913 | ||
914 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
50526df6 | 915 | (u32) ec->common.gpe_bit); |
1da177e4 | 916 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
50526df6 LB |
917 | (u32) ec->common.status_addr.address, |
918 | (u32) ec->common.data_addr.address); | |
1da177e4 | 919 | seq_printf(seq, "use global lock: %s\n", |
50526df6 | 920 | ec->common.global_lock ? "yes" : "no"); |
45bea155 | 921 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 922 | |
50526df6 | 923 | end: |
d550d98d | 924 | return 0; |
1da177e4 LT |
925 | } |
926 | ||
927 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
928 | { | |
929 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
930 | } | |
931 | ||
d7508032 | 932 | static const struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
933 | .open = acpi_ec_info_open_fs, |
934 | .read = seq_read, | |
935 | .llseek = seq_lseek, | |
936 | .release = single_release, | |
1da177e4 LT |
937 | .owner = THIS_MODULE, |
938 | }; | |
939 | ||
50526df6 | 940 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 941 | { |
50526df6 | 942 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 943 | |
1da177e4 LT |
944 | |
945 | if (!acpi_device_dir(device)) { | |
946 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 947 | acpi_ec_dir); |
1da177e4 | 948 | if (!acpi_device_dir(device)) |
d550d98d | 949 | return -ENODEV; |
1da177e4 LT |
950 | } |
951 | ||
952 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 953 | acpi_device_dir(device)); |
1da177e4 | 954 | if (!entry) |
d550d98d | 955 | return -ENODEV; |
1da177e4 LT |
956 | else { |
957 | entry->proc_fops = &acpi_ec_info_ops; | |
958 | entry->data = acpi_driver_data(device); | |
959 | entry->owner = THIS_MODULE; | |
960 | } | |
961 | ||
d550d98d | 962 | return 0; |
1da177e4 LT |
963 | } |
964 | ||
50526df6 | 965 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 966 | { |
1da177e4 LT |
967 | |
968 | if (acpi_device_dir(device)) { | |
969 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
970 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
971 | acpi_device_dir(device) = NULL; | |
972 | } | |
973 | ||
d550d98d | 974 | return 0; |
1da177e4 LT |
975 | } |
976 | ||
1da177e4 LT |
977 | /* -------------------------------------------------------------------------- |
978 | Driver Interface | |
979 | -------------------------------------------------------------------------- */ | |
980 | ||
02b28a33 | 981 | static int acpi_ec_poll_add(struct acpi_device *device) |
1da177e4 | 982 | { |
50526df6 LB |
983 | int result = 0; |
984 | acpi_status status = AE_OK; | |
985 | union acpi_ec *ec = NULL; | |
45bea155 | 986 | |
45bea155 LY |
987 | |
988 | if (!device) | |
d550d98d | 989 | return -EINVAL; |
45bea155 LY |
990 | |
991 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
992 | if (!ec) | |
d550d98d | 993 | return -ENOMEM; |
45bea155 LY |
994 | memset(ec, 0, sizeof(union acpi_ec)); |
995 | ||
996 | ec->common.handle = device->handle; | |
997 | ec->common.uid = -1; | |
f9a6ee1a | 998 | init_MUTEX(&ec->poll.sem); |
45bea155 LY |
999 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1000 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1001 | acpi_driver_data(device) = ec; | |
1002 | ||
1003 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1004 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1005 | &ec->common.global_lock); | |
45bea155 | 1006 | |
ff2fc3e9 JS |
1007 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
1008 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
1009 | if (ec_ecdt) { | |
45bea155 | 1010 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
1011 | ACPI_ADR_SPACE_EC, |
1012 | &acpi_ec_space_handler); | |
1013 | ||
1014 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, | |
1015 | &acpi_ec_gpe_handler); | |
45bea155 LY |
1016 | |
1017 | kfree(ec_ecdt); | |
1018 | } | |
1019 | ||
1020 | /* Get GPE bit assignment (EC events). */ | |
1021 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1022 | status = |
1023 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1024 | &ec->common.gpe_bit); | |
45bea155 | 1025 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 1026 | ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit")); |
45bea155 LY |
1027 | result = -ENODEV; |
1028 | goto end; | |
1029 | } | |
1030 | ||
1031 | result = acpi_ec_add_fs(device); | |
1032 | if (result) | |
1033 | goto end; | |
1034 | ||
02b28a33 | 1035 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n", |
50526df6 LB |
1036 | acpi_device_name(device), acpi_device_bid(device), |
1037 | (u32) ec->common.gpe_bit); | |
45bea155 LY |
1038 | |
1039 | if (!first_ec) | |
1040 | first_ec = device; | |
1041 | ||
50526df6 | 1042 | end: |
45bea155 LY |
1043 | if (result) |
1044 | kfree(ec); | |
1045 | ||
d550d98d | 1046 | return result; |
45bea155 | 1047 | } |
02b28a33 | 1048 | static int acpi_ec_intr_add(struct acpi_device *device) |
45bea155 | 1049 | { |
50526df6 LB |
1050 | int result = 0; |
1051 | acpi_status status = AE_OK; | |
1052 | union acpi_ec *ec = NULL; | |
1da177e4 | 1053 | |
1da177e4 LT |
1054 | |
1055 | if (!device) | |
d550d98d | 1056 | return -EINVAL; |
1da177e4 | 1057 | |
45bea155 | 1058 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 | 1059 | if (!ec) |
d550d98d | 1060 | return -ENOMEM; |
45bea155 LY |
1061 | memset(ec, 0, sizeof(union acpi_ec)); |
1062 | ||
1063 | ec->common.handle = device->handle; | |
1064 | ec->common.uid = -1; | |
02b28a33 LB |
1065 | atomic_set(&ec->intr.pending_gpe, 0); |
1066 | atomic_set(&ec->intr.leaving_burst, 1); | |
1067 | init_MUTEX(&ec->intr.sem); | |
1068 | init_waitqueue_head(&ec->intr.wait); | |
1da177e4 LT |
1069 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1070 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1071 | acpi_driver_data(device) = ec; | |
1072 | ||
1073 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1074 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1075 | &ec->common.global_lock); | |
1da177e4 | 1076 | |
ff2fc3e9 JS |
1077 | /* XXX we don't test uids, because on some boxes ecdt uid = 0, see: |
1078 | http://bugzilla.kernel.org/show_bug.cgi?id=6111 */ | |
1079 | if (ec_ecdt) { | |
1da177e4 | 1080 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
1081 | ACPI_ADR_SPACE_EC, |
1082 | &acpi_ec_space_handler); | |
451566f4 | 1083 | |
50526df6 LB |
1084 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
1085 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
1086 | |
1087 | kfree(ec_ecdt); | |
1088 | } | |
1089 | ||
1090 | /* Get GPE bit assignment (EC events). */ | |
1091 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1092 | status = |
1093 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1094 | &ec->common.gpe_bit); | |
1da177e4 | 1095 | if (ACPI_FAILURE(status)) { |
6468463a | 1096 | printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n"); |
1da177e4 LT |
1097 | result = -ENODEV; |
1098 | goto end; | |
1099 | } | |
1100 | ||
1101 | result = acpi_ec_add_fs(device); | |
1102 | if (result) | |
1103 | goto end; | |
1104 | ||
02b28a33 | 1105 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n", |
50526df6 LB |
1106 | acpi_device_name(device), acpi_device_bid(device), |
1107 | (u32) ec->common.gpe_bit); | |
1da177e4 LT |
1108 | |
1109 | if (!first_ec) | |
1110 | first_ec = device; | |
1111 | ||
50526df6 | 1112 | end: |
1da177e4 LT |
1113 | if (result) |
1114 | kfree(ec); | |
1115 | ||
d550d98d | 1116 | return result; |
1da177e4 LT |
1117 | } |
1118 | ||
50526df6 | 1119 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 1120 | { |
50526df6 | 1121 | union acpi_ec *ec = NULL; |
1da177e4 | 1122 | |
1da177e4 LT |
1123 | |
1124 | if (!device) | |
d550d98d | 1125 | return -EINVAL; |
1da177e4 LT |
1126 | |
1127 | ec = acpi_driver_data(device); | |
1128 | ||
1129 | acpi_ec_remove_fs(device); | |
1130 | ||
1131 | kfree(ec); | |
1132 | ||
d550d98d | 1133 | return 0; |
1da177e4 LT |
1134 | } |
1135 | ||
1da177e4 | 1136 | static acpi_status |
50526df6 | 1137 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1138 | { |
50526df6 | 1139 | union acpi_ec *ec = (union acpi_ec *)context; |
1da177e4 LT |
1140 | struct acpi_generic_address *addr; |
1141 | ||
50eca3eb | 1142 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
1143 | return AE_OK; |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * The first address region returned is the data port, and | |
1148 | * the second address region returned is the status/command | |
1149 | * port. | |
1150 | */ | |
45bea155 LY |
1151 | if (ec->common.data_addr.register_bit_width == 0) { |
1152 | addr = &ec->common.data_addr; | |
1153 | } else if (ec->common.command_addr.register_bit_width == 0) { | |
1154 | addr = &ec->common.command_addr; | |
1da177e4 LT |
1155 | } else { |
1156 | return AE_CTRL_TERMINATE; | |
1157 | } | |
1158 | ||
1159 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
1160 | addr->register_bit_width = 8; | |
1161 | addr->register_bit_offset = 0; | |
50eca3eb | 1162 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
1163 | |
1164 | return AE_OK; | |
1165 | } | |
1166 | ||
50526df6 | 1167 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 1168 | { |
50526df6 LB |
1169 | acpi_status status = AE_OK; |
1170 | union acpi_ec *ec = NULL; | |
1da177e4 | 1171 | |
1da177e4 LT |
1172 | |
1173 | if (!device) | |
d550d98d | 1174 | return -EINVAL; |
1da177e4 LT |
1175 | |
1176 | ec = acpi_driver_data(device); | |
1177 | ||
1178 | if (!ec) | |
d550d98d | 1179 | return -EINVAL; |
1da177e4 LT |
1180 | |
1181 | /* | |
1182 | * Get I/O port addresses. Convert to GAS format. | |
1183 | */ | |
45bea155 | 1184 | status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS, |
50526df6 LB |
1185 | acpi_ec_io_ports, ec); |
1186 | if (ACPI_FAILURE(status) | |
1187 | || ec->common.command_addr.register_bit_width == 0) { | |
6468463a | 1188 | printk(KERN_ERR PREFIX "Error getting I/O port addresses\n"); |
d550d98d | 1189 | return -ENODEV; |
1da177e4 LT |
1190 | } |
1191 | ||
45bea155 | 1192 | ec->common.status_addr = ec->common.command_addr; |
1da177e4 LT |
1193 | |
1194 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
50526df6 LB |
1195 | (u32) ec->common.gpe_bit, |
1196 | (u32) ec->common.command_addr.address, | |
1197 | (u32) ec->common.data_addr.address)); | |
1da177e4 LT |
1198 | |
1199 | /* | |
1200 | * Install GPE handler | |
1201 | */ | |
45bea155 | 1202 | status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit, |
50526df6 LB |
1203 | ACPI_GPE_EDGE_TRIGGERED, |
1204 | &acpi_ec_gpe_handler, ec); | |
1da177e4 | 1205 | if (ACPI_FAILURE(status)) { |
d550d98d | 1206 | return -ENODEV; |
1da177e4 | 1207 | } |
50526df6 LB |
1208 | acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1209 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 1210 | |
50526df6 LB |
1211 | status = acpi_install_address_space_handler(ec->common.handle, |
1212 | ACPI_ADR_SPACE_EC, | |
1213 | &acpi_ec_space_handler, | |
1214 | &acpi_ec_space_setup, ec); | |
1da177e4 | 1215 | if (ACPI_FAILURE(status)) { |
50526df6 LB |
1216 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, |
1217 | &acpi_ec_gpe_handler); | |
d550d98d | 1218 | return -ENODEV; |
1da177e4 LT |
1219 | } |
1220 | ||
d550d98d | 1221 | return AE_OK; |
1da177e4 LT |
1222 | } |
1223 | ||
50526df6 | 1224 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 1225 | { |
50526df6 LB |
1226 | acpi_status status = AE_OK; |
1227 | union acpi_ec *ec = NULL; | |
1da177e4 | 1228 | |
1da177e4 LT |
1229 | |
1230 | if (!device) | |
d550d98d | 1231 | return -EINVAL; |
1da177e4 LT |
1232 | |
1233 | ec = acpi_driver_data(device); | |
1234 | ||
45bea155 | 1235 | status = acpi_remove_address_space_handler(ec->common.handle, |
50526df6 LB |
1236 | ACPI_ADR_SPACE_EC, |
1237 | &acpi_ec_space_handler); | |
1da177e4 | 1238 | if (ACPI_FAILURE(status)) |
d550d98d | 1239 | return -ENODEV; |
1da177e4 | 1240 | |
50526df6 LB |
1241 | status = |
1242 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, | |
1243 | &acpi_ec_gpe_handler); | |
1da177e4 | 1244 | if (ACPI_FAILURE(status)) |
d550d98d | 1245 | return -ENODEV; |
1da177e4 | 1246 | |
d550d98d | 1247 | return 0; |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | static acpi_status __init | |
50526df6 LB |
1251 | acpi_fake_ecdt_callback(acpi_handle handle, |
1252 | u32 Level, void *context, void **retval) | |
1da177e4 | 1253 | { |
45bea155 | 1254 | |
02b28a33 LB |
1255 | if (acpi_ec_poll_mode) |
1256 | return acpi_fake_ecdt_poll_callback(handle, | |
50526df6 | 1257 | Level, context, retval); |
45bea155 | 1258 | else |
02b28a33 | 1259 | return acpi_fake_ecdt_intr_callback(handle, |
50526df6 | 1260 | Level, context, retval); |
45bea155 LY |
1261 | } |
1262 | ||
1263 | static acpi_status __init | |
02b28a33 | 1264 | acpi_fake_ecdt_poll_callback(acpi_handle handle, |
50526df6 | 1265 | u32 Level, void *context, void **retval) |
45bea155 | 1266 | { |
50526df6 | 1267 | acpi_status status; |
45bea155 LY |
1268 | |
1269 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
50526df6 | 1270 | acpi_ec_io_ports, ec_ecdt); |
45bea155 LY |
1271 | if (ACPI_FAILURE(status)) |
1272 | return status; | |
1273 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; | |
1274 | ||
1275 | ec_ecdt->common.uid = -1; | |
1276 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1277 | ||
50526df6 LB |
1278 | status = |
1279 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1280 | &ec_ecdt->common.gpe_bit); | |
45bea155 LY |
1281 | if (ACPI_FAILURE(status)) |
1282 | return status; | |
f9a6ee1a | 1283 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1284 | ec_ecdt->common.global_lock = TRUE; |
1285 | ec_ecdt->common.handle = handle; | |
1286 | ||
50526df6 LB |
1287 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1288 | (u32) ec_ecdt->common.gpe_bit, | |
1289 | (u32) ec_ecdt->common.command_addr.address, | |
1290 | (u32) ec_ecdt->common.data_addr.address); | |
45bea155 LY |
1291 | |
1292 | return AE_CTRL_TERMINATE; | |
1293 | } | |
1294 | ||
1295 | static acpi_status __init | |
02b28a33 | 1296 | acpi_fake_ecdt_intr_callback(acpi_handle handle, |
50526df6 | 1297 | u32 Level, void *context, void **retval) |
45bea155 | 1298 | { |
50526df6 | 1299 | acpi_status status; |
1da177e4 | 1300 | |
02b28a33 LB |
1301 | init_MUTEX(&ec_ecdt->intr.sem); |
1302 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
1da177e4 | 1303 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 1304 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
1305 | if (ACPI_FAILURE(status)) |
1306 | return status; | |
45bea155 | 1307 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; |
1da177e4 | 1308 | |
45bea155 LY |
1309 | ec_ecdt->common.uid = -1; |
1310 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1da177e4 | 1311 | |
50526df6 LB |
1312 | status = |
1313 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1314 | &ec_ecdt->common.gpe_bit); | |
1da177e4 LT |
1315 | if (ACPI_FAILURE(status)) |
1316 | return status; | |
45bea155 LY |
1317 | ec_ecdt->common.global_lock = TRUE; |
1318 | ec_ecdt->common.handle = handle; | |
1da177e4 | 1319 | |
50526df6 LB |
1320 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1321 | (u32) ec_ecdt->common.gpe_bit, | |
1322 | (u32) ec_ecdt->common.command_addr.address, | |
1323 | (u32) ec_ecdt->common.data_addr.address); | |
1da177e4 LT |
1324 | |
1325 | return AE_CTRL_TERMINATE; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1330 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1331 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1332 | * required, but if EC regison is accessed early, it is required. | |
1333 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1334 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1335 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1336 | * all systems found. | |
1337 | */ | |
50526df6 | 1338 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 1339 | { |
50526df6 LB |
1340 | acpi_status status; |
1341 | int ret = 0; | |
1da177e4 LT |
1342 | |
1343 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1344 | ||
45bea155 | 1345 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1346 | if (!ec_ecdt) { |
1347 | ret = -ENOMEM; | |
1348 | goto error; | |
1349 | } | |
45bea155 | 1350 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1da177e4 | 1351 | |
50526df6 LB |
1352 | status = acpi_get_devices(ACPI_EC_HID, |
1353 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
1354 | if (ACPI_FAILURE(status)) { |
1355 | kfree(ec_ecdt); | |
1356 | ec_ecdt = NULL; | |
1357 | ret = -ENODEV; | |
1358 | goto error; | |
1359 | } | |
1360 | return 0; | |
50526df6 | 1361 | error: |
1da177e4 LT |
1362 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
1363 | return ret; | |
1364 | } | |
1365 | ||
50526df6 | 1366 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 | 1367 | { |
02b28a33 LB |
1368 | if (acpi_ec_poll_mode) |
1369 | return acpi_ec_poll_get_real_ecdt(); | |
45bea155 | 1370 | else |
02b28a33 | 1371 | return acpi_ec_intr_get_real_ecdt(); |
45bea155 LY |
1372 | } |
1373 | ||
02b28a33 | 1374 | static int __init acpi_ec_poll_get_real_ecdt(void) |
45bea155 | 1375 | { |
50526df6 LB |
1376 | acpi_status status; |
1377 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 1378 | |
50526df6 LB |
1379 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1380 | (struct acpi_table_header **) | |
1381 | &ecdt_ptr); | |
45bea155 LY |
1382 | if (ACPI_FAILURE(status)) |
1383 | return -ENODEV; | |
1384 | ||
1385 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1386 | ||
1387 | /* | |
1388 | * Generate a temporary ec context to use until the namespace is scanned | |
1389 | */ | |
1390 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
1391 | if (!ec_ecdt) | |
1392 | return -ENOMEM; | |
1393 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); | |
1394 | ||
1395 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; | |
1396 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1397 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1398 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
f9a6ee1a | 1399 | init_MUTEX(&ec_ecdt->poll.sem); |
45bea155 LY |
1400 | /* use the GL just to be safe */ |
1401 | ec_ecdt->common.global_lock = TRUE; | |
1402 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1403 | ||
50526df6 LB |
1404 | status = |
1405 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
45bea155 LY |
1406 | if (ACPI_FAILURE(status)) { |
1407 | goto error; | |
1408 | } | |
1409 | ||
1410 | return 0; | |
50526df6 | 1411 | error: |
45bea155 LY |
1412 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1413 | kfree(ec_ecdt); | |
1414 | ec_ecdt = NULL; | |
1415 | ||
1416 | return -ENODEV; | |
1417 | } | |
1418 | ||
02b28a33 | 1419 | static int __init acpi_ec_intr_get_real_ecdt(void) |
1da177e4 | 1420 | { |
50526df6 LB |
1421 | acpi_status status; |
1422 | struct acpi_table_ecdt *ecdt_ptr; | |
1da177e4 | 1423 | |
451566f4 | 1424 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
50526df6 LB |
1425 | (struct acpi_table_header **) |
1426 | &ecdt_ptr); | |
1da177e4 LT |
1427 | if (ACPI_FAILURE(status)) |
1428 | return -ENODEV; | |
1429 | ||
1430 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1431 | ||
1432 | /* | |
1433 | * Generate a temporary ec context to use until the namespace is scanned | |
1434 | */ | |
45bea155 | 1435 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1436 | if (!ec_ecdt) |
1437 | return -ENOMEM; | |
45bea155 LY |
1438 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1439 | ||
02b28a33 LB |
1440 | init_MUTEX(&ec_ecdt->intr.sem); |
1441 | init_waitqueue_head(&ec_ecdt->intr.wait); | |
45bea155 LY |
1442 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; |
1443 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1444 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1445 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 1446 | /* use the GL just to be safe */ |
45bea155 LY |
1447 | ec_ecdt->common.global_lock = TRUE; |
1448 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1da177e4 | 1449 | |
50526df6 LB |
1450 | status = |
1451 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
1da177e4 LT |
1452 | if (ACPI_FAILURE(status)) { |
1453 | goto error; | |
1454 | } | |
1455 | ||
1456 | return 0; | |
50526df6 | 1457 | error: |
1da177e4 LT |
1458 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1459 | kfree(ec_ecdt); | |
1460 | ec_ecdt = NULL; | |
1461 | ||
1462 | return -ENODEV; | |
1463 | } | |
1464 | ||
1465 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 1466 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 1467 | { |
50526df6 LB |
1468 | acpi_status status; |
1469 | int ret; | |
1da177e4 LT |
1470 | |
1471 | ret = acpi_ec_get_real_ecdt(); | |
1472 | /* Try to make a fake ECDT */ | |
1473 | if (ret && acpi_fake_ecdt_enabled) { | |
1474 | ret = acpi_ec_fake_ecdt(); | |
1475 | } | |
1476 | ||
1477 | if (ret) | |
1478 | return 0; | |
1479 | ||
1480 | /* | |
1481 | * Install GPE handler | |
1482 | */ | |
45bea155 | 1483 | status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 LB |
1484 | ACPI_GPE_EDGE_TRIGGERED, |
1485 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1486 | if (ACPI_FAILURE(status)) { |
1487 | goto error; | |
1488 | } | |
50526df6 LB |
1489 | acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1490 | acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR); | |
1491 | ||
1492 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1493 | ACPI_ADR_SPACE_EC, | |
1494 | &acpi_ec_space_handler, | |
1495 | &acpi_ec_space_setup, | |
1496 | ec_ecdt); | |
1da177e4 | 1497 | if (ACPI_FAILURE(status)) { |
45bea155 | 1498 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 | 1499 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1500 | goto error; |
1501 | } | |
1502 | ||
1503 | return 0; | |
1504 | ||
50526df6 | 1505 | error: |
1da177e4 LT |
1506 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1507 | kfree(ec_ecdt); | |
1508 | ec_ecdt = NULL; | |
1509 | ||
1510 | return -ENODEV; | |
1511 | } | |
1512 | ||
50526df6 | 1513 | static int __init acpi_ec_init(void) |
1da177e4 | 1514 | { |
50526df6 | 1515 | int result = 0; |
1da177e4 | 1516 | |
1da177e4 LT |
1517 | |
1518 | if (acpi_disabled) | |
d550d98d | 1519 | return 0; |
1da177e4 LT |
1520 | |
1521 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1522 | if (!acpi_ec_dir) | |
d550d98d | 1523 | return -ENODEV; |
1da177e4 LT |
1524 | |
1525 | /* Now register the driver for the EC */ | |
1526 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1527 | if (result < 0) { | |
1528 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1529 | return -ENODEV; |
1da177e4 LT |
1530 | } |
1531 | ||
d550d98d | 1532 | return result; |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | subsys_initcall(acpi_ec_init); | |
1536 | ||
1537 | /* EC driver currently not unloadable */ | |
1538 | #if 0 | |
50526df6 | 1539 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1540 | { |
1da177e4 LT |
1541 | |
1542 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1543 | ||
1544 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1545 | ||
d550d98d | 1546 | return; |
1da177e4 | 1547 | } |
50526df6 | 1548 | #endif /* 0 */ |
1da177e4 LT |
1549 | |
1550 | static int __init acpi_fake_ecdt_setup(char *str) | |
1551 | { | |
1552 | acpi_fake_ecdt_enabled = 1; | |
9b41046c | 1553 | return 1; |
1da177e4 | 1554 | } |
7b15f5e7 | 1555 | |
1da177e4 | 1556 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
02b28a33 | 1557 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 1558 | { |
02b28a33 | 1559 | int intr; |
7b15f5e7 | 1560 | |
02b28a33 | 1561 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
1562 | return 0; |
1563 | ||
02b28a33 LB |
1564 | if (intr) { |
1565 | acpi_ec_poll_mode = EC_INTR; | |
1566 | acpi_ec_driver.ops.add = acpi_ec_intr_add; | |
7b15f5e7 | 1567 | } else { |
02b28a33 LB |
1568 | acpi_ec_poll_mode = EC_POLL; |
1569 | acpi_ec_driver.ops.add = acpi_ec_poll_add; | |
7b15f5e7 | 1570 | } |
02b28a33 | 1571 | printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling"); |
9b41046c | 1572 | return 1; |
45bea155 | 1573 | } |
50526df6 | 1574 | |
53f11d4f | 1575 | __setup("ec_intr=", acpi_ec_set_intr_mode); |