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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 | |
f52fd66d | 41 | ACPI_MODULE_NAME("ec"); |
1da177e4 LT |
42 | #define ACPI_EC_COMPONENT 0x00100000 |
43 | #define ACPI_EC_CLASS "embedded_controller" | |
44 | #define ACPI_EC_HID "PNP0C09" | |
1da177e4 LT |
45 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
46 | #define ACPI_EC_FILE_INFO "info" | |
af3fd140 AS |
47 | #undef PREFIX |
48 | #define PREFIX "ACPI: EC: " | |
703959d4 | 49 | /* EC status register */ |
1da177e4 LT |
50 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
51 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 52 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 53 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
703959d4 | 54 | /* EC commands */ |
3261ff4d | 55 | enum ec_command { |
6ccedb10 AS |
56 | ACPI_EC_COMMAND_READ = 0x80, |
57 | ACPI_EC_COMMAND_WRITE = 0x81, | |
58 | ACPI_EC_BURST_ENABLE = 0x82, | |
59 | ACPI_EC_BURST_DISABLE = 0x83, | |
60 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 61 | }; |
703959d4 | 62 | /* EC events */ |
3261ff4d | 63 | enum ec_event { |
703959d4 | 64 | ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ |
6ccedb10 | 65 | ACPI_EC_EVENT_IBF_0, /* Input buffer empty */ |
703959d4 DS |
66 | }; |
67 | ||
5c406412 | 68 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
703959d4 | 70 | |
3261ff4d | 71 | static enum ec_mode { |
6ccedb10 AS |
72 | EC_INTR = 1, /* Output buffer full */ |
73 | EC_POLL, /* Input buffer empty */ | |
3261ff4d | 74 | } acpi_ec_mode = EC_INTR; |
703959d4 | 75 | |
50526df6 LB |
76 | static int acpi_ec_remove(struct acpi_device *device, int type); |
77 | static int acpi_ec_start(struct acpi_device *device); | |
78 | static int acpi_ec_stop(struct acpi_device *device, int type); | |
703959d4 | 79 | static int acpi_ec_add(struct acpi_device *device); |
1da177e4 LT |
80 | |
81 | static struct acpi_driver acpi_ec_driver = { | |
c2b6705b | 82 | .name = "ec", |
50526df6 LB |
83 | .class = ACPI_EC_CLASS, |
84 | .ids = ACPI_EC_HID, | |
85 | .ops = { | |
703959d4 | 86 | .add = acpi_ec_add, |
50526df6 LB |
87 | .remove = acpi_ec_remove, |
88 | .start = acpi_ec_start, | |
89 | .stop = acpi_ec_stop, | |
90 | }, | |
1da177e4 | 91 | }; |
6ffb221a DS |
92 | |
93 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
a854e08a | 94 | static struct acpi_ec { |
703959d4 DS |
95 | acpi_handle handle; |
96 | unsigned long uid; | |
a86e2772 | 97 | unsigned long gpe; |
6ffb221a DS |
98 | unsigned long command_addr; |
99 | unsigned long data_addr; | |
703959d4 | 100 | unsigned long global_lock; |
c787a855 | 101 | struct mutex lock; |
5d0c288b | 102 | atomic_t query_pending; |
9e197219 | 103 | atomic_t event_count; |
703959d4 | 104 | wait_queue_head_t wait; |
6ffb221a | 105 | } *ec_ecdt; |
703959d4 DS |
106 | |
107 | /* External interfaces use first EC only, so remember */ | |
108 | static struct acpi_device *first_ec; | |
703959d4 | 109 | |
1da177e4 LT |
110 | /* -------------------------------------------------------------------------- |
111 | Transaction Management | |
112 | -------------------------------------------------------------------------- */ | |
113 | ||
6ffb221a | 114 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 115 | { |
6ffb221a | 116 | return inb(ec->command_addr); |
451566f4 DT |
117 | } |
118 | ||
6ffb221a | 119 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 120 | { |
6ffb221a | 121 | return inb(ec->data_addr); |
7c6db5e5 DS |
122 | } |
123 | ||
6ffb221a | 124 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 125 | { |
6ffb221a | 126 | outb(command, ec->command_addr); |
45bea155 LY |
127 | } |
128 | ||
6ffb221a | 129 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 130 | { |
6ffb221a | 131 | outb(data, ec->data_addr); |
703959d4 | 132 | } |
45bea155 | 133 | |
9e197219 AS |
134 | static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event, |
135 | unsigned old_count) | |
6ffb221a | 136 | { |
bec5a1e0 | 137 | u8 status = acpi_ec_read_status(ec); |
9e197219 AS |
138 | if (old_count == atomic_read(&ec->event_count)) |
139 | return 0; | |
78d0af33 | 140 | if (event == ACPI_EC_EVENT_OBF_1) { |
703959d4 DS |
141 | if (status & ACPI_EC_FLAG_OBF) |
142 | return 1; | |
78d0af33 | 143 | } else if (event == ACPI_EC_EVENT_IBF_0) { |
703959d4 DS |
144 | if (!(status & ACPI_EC_FLAG_IBF)) |
145 | return 1; | |
45bea155 LY |
146 | } |
147 | ||
703959d4 | 148 | return 0; |
45bea155 | 149 | } |
451566f4 | 150 | |
9e197219 | 151 | static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count) |
7c6db5e5 | 152 | { |
af3fd140 | 153 | if (acpi_ec_mode == EC_POLL) { |
50c1e113 AS |
154 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
155 | while (time_before(jiffies, delay)) { | |
9e197219 | 156 | if (acpi_ec_check_status(ec, event, 0)) |
7c6db5e5 DS |
157 | return 0; |
158 | } | |
af3fd140 AS |
159 | } else { |
160 | if (wait_event_timeout(ec->wait, | |
9e197219 | 161 | acpi_ec_check_status(ec, event, count), |
af3fd140 | 162 | msecs_to_jiffies(ACPI_EC_DELAY)) || |
9e197219 | 163 | acpi_ec_check_status(ec, event, 0)) { |
703959d4 | 164 | return 0; |
af3fd140 AS |
165 | } else { |
166 | printk(KERN_ERR PREFIX "acpi_ec_wait timeout," | |
167 | " status = %d, expect_event = %d\n", | |
6ccedb10 | 168 | acpi_ec_read_status(ec), event); |
703959d4 | 169 | } |
af3fd140 | 170 | } |
1da177e4 | 171 | |
d550d98d | 172 | return -ETIME; |
1da177e4 LT |
173 | } |
174 | ||
703959d4 | 175 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
176 | const u8 * wdata, unsigned wdata_len, |
177 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 178 | { |
af3fd140 | 179 | int result = 0; |
9e197219 | 180 | unsigned count = atomic_read(&ec->event_count); |
703959d4 | 181 | acpi_ec_write_cmd(ec, command); |
45bea155 | 182 | |
78d0af33 | 183 | for (; wdata_len > 0; --wdata_len) { |
9e197219 | 184 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count); |
af3fd140 | 185 | if (result) { |
6ccedb10 AS |
186 | printk(KERN_ERR PREFIX |
187 | "write_cmd timeout, command = %d\n", command); | |
af3fd140 AS |
188 | goto end; |
189 | } | |
9e197219 | 190 | count = atomic_read(&ec->event_count); |
703959d4 | 191 | acpi_ec_write_data(ec, *(wdata++)); |
3576cf61 | 192 | } |
45bea155 | 193 | |
d91df1aa | 194 | if (!rdata_len) { |
9e197219 | 195 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count); |
af3fd140 | 196 | if (result) { |
6ccedb10 AS |
197 | printk(KERN_ERR PREFIX |
198 | "finish-write timeout, command = %d\n", command); | |
af3fd140 AS |
199 | goto end; |
200 | } | |
5d0c288b AS |
201 | } else if (command == ACPI_EC_COMMAND_QUERY) { |
202 | atomic_set(&ec->query_pending, 0); | |
7c6db5e5 | 203 | } |
45bea155 | 204 | |
78d0af33 | 205 | for (; rdata_len > 0; --rdata_len) { |
9e197219 | 206 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count); |
af3fd140 AS |
207 | if (result) { |
208 | printk(KERN_ERR PREFIX "read timeout, command = %d\n", | |
6ccedb10 | 209 | command); |
af3fd140 AS |
210 | goto end; |
211 | } | |
9e197219 | 212 | count = atomic_read(&ec->event_count); |
6ffb221a | 213 | *(rdata++) = acpi_ec_read_data(ec); |
7c6db5e5 | 214 | } |
af3fd140 AS |
215 | end: |
216 | return result; | |
45bea155 LY |
217 | } |
218 | ||
3576cf61 | 219 | static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, |
6ccedb10 AS |
220 | const u8 * wdata, unsigned wdata_len, |
221 | u8 * rdata, unsigned rdata_len) | |
1da177e4 | 222 | { |
d7a76e4c | 223 | int status; |
50526df6 | 224 | u32 glk; |
1da177e4 | 225 | |
d7a76e4c | 226 | if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata)) |
d550d98d | 227 | return -EINVAL; |
1da177e4 | 228 | |
6ccedb10 AS |
229 | if (rdata) |
230 | memset(rdata, 0, rdata_len); | |
1da177e4 | 231 | |
523953b4 | 232 | mutex_lock(&ec->lock); |
703959d4 | 233 | if (ec->global_lock) { |
1da177e4 | 234 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b AS |
235 | if (ACPI_FAILURE(status)) { |
236 | mutex_unlock(&ec->lock); | |
d550d98d | 237 | return -ENODEV; |
c24e912b | 238 | } |
1da177e4 | 239 | } |
451566f4 | 240 | |
5d57a6a5 | 241 | /* Make sure GPE is enabled before doing transaction */ |
a86e2772 | 242 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
5d57a6a5 | 243 | |
9e197219 | 244 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); |
716e084e | 245 | if (status) { |
6ccedb10 AS |
246 | printk(KERN_DEBUG PREFIX |
247 | "input buffer is not empty, aborting transaction\n"); | |
451566f4 | 248 | goto end; |
716e084e | 249 | } |
1da177e4 | 250 | |
6ccedb10 AS |
251 | status = acpi_ec_transaction_unlocked(ec, command, |
252 | wdata, wdata_len, | |
253 | rdata, rdata_len); | |
1da177e4 | 254 | |
6ccedb10 | 255 | end: |
1da177e4 | 256 | |
703959d4 | 257 | if (ec->global_lock) |
1da177e4 | 258 | acpi_release_global_lock(glk); |
523953b4 | 259 | mutex_unlock(&ec->lock); |
1da177e4 | 260 | |
d550d98d | 261 | return status; |
1da177e4 LT |
262 | } |
263 | ||
c45aac43 AS |
264 | /* |
265 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
266 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
267 | */ | |
268 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
269 | { | |
270 | u8 d; | |
271 | return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1); | |
272 | } | |
273 | ||
274 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
275 | { | |
276 | return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0); | |
277 | } | |
278 | ||
6ccedb10 | 279 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
280 | { |
281 | int result; | |
282 | u8 d; | |
283 | ||
284 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, | |
285 | &address, 1, &d, 1); | |
286 | *data = d; | |
287 | return result; | |
288 | } | |
6ffb221a | 289 | |
3576cf61 DS |
290 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
291 | { | |
6ccedb10 AS |
292 | u8 wdata[2] = { address, data }; |
293 | return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, | |
3576cf61 DS |
294 | wdata, 2, NULL, 0); |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Externally callable EC access functions. For now, assume 1 EC only | |
299 | */ | |
c45aac43 AS |
300 | int ec_burst_enable(void) |
301 | { | |
302 | struct acpi_ec *ec; | |
303 | if (!first_ec) | |
304 | return -ENODEV; | |
305 | ec = acpi_driver_data(first_ec); | |
306 | return acpi_ec_burst_enable(ec); | |
307 | } | |
308 | ||
309 | EXPORT_SYMBOL(ec_burst_enable); | |
310 | ||
311 | int ec_burst_disable(void) | |
312 | { | |
313 | struct acpi_ec *ec; | |
314 | if (!first_ec) | |
315 | return -ENODEV; | |
316 | ec = acpi_driver_data(first_ec); | |
317 | return acpi_ec_burst_disable(ec); | |
318 | } | |
319 | ||
320 | EXPORT_SYMBOL(ec_burst_disable); | |
321 | ||
6ccedb10 | 322 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 323 | { |
703959d4 | 324 | struct acpi_ec *ec; |
1da177e4 | 325 | int err; |
6ffb221a | 326 | u8 temp_data; |
1da177e4 LT |
327 | |
328 | if (!first_ec) | |
329 | return -ENODEV; | |
330 | ||
331 | ec = acpi_driver_data(first_ec); | |
332 | ||
333 | err = acpi_ec_read(ec, addr, &temp_data); | |
334 | ||
335 | if (!err) { | |
336 | *val = temp_data; | |
337 | return 0; | |
50526df6 | 338 | } else |
1da177e4 LT |
339 | return err; |
340 | } | |
50526df6 | 341 | |
1da177e4 LT |
342 | EXPORT_SYMBOL(ec_read); |
343 | ||
50526df6 | 344 | int ec_write(u8 addr, u8 val) |
1da177e4 | 345 | { |
703959d4 | 346 | struct acpi_ec *ec; |
1da177e4 LT |
347 | int err; |
348 | ||
349 | if (!first_ec) | |
350 | return -ENODEV; | |
351 | ||
352 | ec = acpi_driver_data(first_ec); | |
353 | ||
354 | err = acpi_ec_write(ec, addr, val); | |
355 | ||
356 | return err; | |
357 | } | |
50526df6 | 358 | |
1da177e4 LT |
359 | EXPORT_SYMBOL(ec_write); |
360 | ||
616362de | 361 | int ec_transaction(u8 command, |
9e197219 AS |
362 | const u8 * wdata, unsigned wdata_len, |
363 | u8 * rdata, unsigned rdata_len) | |
45bea155 | 364 | { |
703959d4 | 365 | struct acpi_ec *ec; |
45bea155 | 366 | |
d7a76e4c LP |
367 | if (!first_ec) |
368 | return -ENODEV; | |
45bea155 | 369 | |
d7a76e4c | 370 | ec = acpi_driver_data(first_ec); |
45bea155 | 371 | |
3576cf61 DS |
372 | return acpi_ec_transaction(ec, command, wdata, |
373 | wdata_len, rdata, rdata_len); | |
45bea155 | 374 | } |
1da177e4 | 375 | |
ab9e43c6 LP |
376 | EXPORT_SYMBOL(ec_transaction); |
377 | ||
6ccedb10 | 378 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
379 | { |
380 | int result; | |
6ccedb10 | 381 | u8 d; |
1da177e4 | 382 | |
6ccedb10 AS |
383 | if (!ec || !data) |
384 | return -EINVAL; | |
1da177e4 | 385 | |
6ccedb10 AS |
386 | /* |
387 | * Query the EC to find out which _Qxx method we need to evaluate. | |
388 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
389 | * bit to be cleared (and thus clearing the interrupt source). | |
390 | */ | |
716e084e | 391 | |
6ccedb10 AS |
392 | result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1); |
393 | if (result) | |
394 | return result; | |
1da177e4 | 395 | |
6ccedb10 AS |
396 | if (!d) |
397 | return -ENODATA; | |
1da177e4 | 398 | |
6ccedb10 AS |
399 | *data = d; |
400 | return 0; | |
1da177e4 LT |
401 | } |
402 | ||
1da177e4 LT |
403 | /* -------------------------------------------------------------------------- |
404 | Event Management | |
405 | -------------------------------------------------------------------------- */ | |
406 | ||
50526df6 | 407 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 408 | { |
3d02b90b | 409 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 410 | u8 value = 0; |
5d0c288b | 411 | char object_name[8]; |
45bea155 | 412 | |
5d0c288b | 413 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 414 | return; |
45bea155 | 415 | |
6ffb221a | 416 | snprintf(object_name, 8, "_Q%2.2X", value); |
45bea155 | 417 | |
c6e19194 | 418 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name)); |
45bea155 | 419 | |
703959d4 | 420 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
45bea155 | 421 | } |
1da177e4 | 422 | |
50526df6 | 423 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 424 | { |
50526df6 | 425 | acpi_status status = AE_OK; |
6ffb221a | 426 | u8 value; |
3d02b90b | 427 | struct acpi_ec *ec = data; |
9e197219 | 428 | atomic_inc(&ec->event_count); |
3d02b90b | 429 | |
8e0341ba | 430 | if (acpi_ec_mode == EC_INTR) { |
af3fd140 | 431 | wake_up(&ec->wait); |
451566f4 DT |
432 | } |
433 | ||
bec5a1e0 | 434 | value = acpi_ec_read_status(ec); |
5d0c288b AS |
435 | if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) { |
436 | atomic_set(&ec->query_pending, 1); | |
6ccedb10 AS |
437 | status = |
438 | acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, | |
439 | ec); | |
50526df6 | 440 | } |
e41334c0 | 441 | |
451566f4 | 442 | return status == AE_OK ? |
50526df6 | 443 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
444 | } |
445 | ||
446 | /* -------------------------------------------------------------------------- | |
447 | Address Space Management | |
448 | -------------------------------------------------------------------------- */ | |
449 | ||
450 | static acpi_status | |
50526df6 LB |
451 | acpi_ec_space_setup(acpi_handle region_handle, |
452 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
453 | { |
454 | /* | |
455 | * The EC object is in the handler context and is needed | |
456 | * when calling the acpi_ec_space_handler. | |
457 | */ | |
50526df6 LB |
458 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
459 | handler_context : NULL; | |
1da177e4 LT |
460 | |
461 | return AE_OK; | |
462 | } | |
463 | ||
1da177e4 | 464 | static acpi_status |
50526df6 LB |
465 | acpi_ec_space_handler(u32 function, |
466 | acpi_physical_address address, | |
467 | u32 bit_width, | |
468 | acpi_integer * value, | |
469 | void *handler_context, void *region_context) | |
1da177e4 | 470 | { |
50526df6 | 471 | int result = 0; |
3d02b90b | 472 | struct acpi_ec *ec = handler_context; |
50526df6 LB |
473 | u64 temp = *value; |
474 | acpi_integer f_v = 0; | |
475 | int i = 0; | |
1da177e4 | 476 | |
1da177e4 | 477 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 478 | return AE_BAD_PARAMETER; |
1da177e4 | 479 | |
fa9cd547 | 480 | if (bit_width != 8 && acpi_strict) { |
d550d98d | 481 | return AE_BAD_PARAMETER; |
1da177e4 LT |
482 | } |
483 | ||
50526df6 | 484 | next_byte: |
1da177e4 LT |
485 | switch (function) { |
486 | case ACPI_READ: | |
fa9cd547 | 487 | temp = 0; |
6ccedb10 | 488 | result = acpi_ec_read(ec, (u8) address, (u8 *) & temp); |
1da177e4 LT |
489 | break; |
490 | case ACPI_WRITE: | |
fa9cd547 | 491 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
492 | break; |
493 | default: | |
494 | result = -EINVAL; | |
495 | goto out; | |
496 | break; | |
497 | } | |
498 | ||
499 | bit_width -= 8; | |
fa9cd547 LY |
500 | if (bit_width) { |
501 | if (function == ACPI_READ) | |
502 | f_v |= temp << 8 * i; | |
503 | if (function == ACPI_WRITE) | |
504 | temp >>= 8; | |
1da177e4 | 505 | i++; |
83ea7445 | 506 | address++; |
1da177e4 LT |
507 | goto next_byte; |
508 | } | |
509 | ||
fa9cd547 LY |
510 | if (function == ACPI_READ) { |
511 | f_v |= temp << 8 * i; | |
1da177e4 LT |
512 | *value = f_v; |
513 | } | |
514 | ||
50526df6 | 515 | out: |
1da177e4 LT |
516 | switch (result) { |
517 | case -EINVAL: | |
d550d98d | 518 | return AE_BAD_PARAMETER; |
1da177e4 LT |
519 | break; |
520 | case -ENODEV: | |
d550d98d | 521 | return AE_NOT_FOUND; |
1da177e4 LT |
522 | break; |
523 | case -ETIME: | |
d550d98d | 524 | return AE_TIME; |
1da177e4 LT |
525 | break; |
526 | default: | |
d550d98d | 527 | return AE_OK; |
1da177e4 | 528 | } |
1da177e4 LT |
529 | } |
530 | ||
1da177e4 LT |
531 | /* -------------------------------------------------------------------------- |
532 | FS Interface (/proc) | |
533 | -------------------------------------------------------------------------- */ | |
534 | ||
50526df6 | 535 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 536 | |
50526df6 | 537 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 538 | { |
3d02b90b | 539 | struct acpi_ec *ec = seq->private; |
1da177e4 | 540 | |
1da177e4 LT |
541 | if (!ec) |
542 | goto end; | |
543 | ||
6ccedb10 | 544 | seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe); |
1da177e4 | 545 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
6ccedb10 | 546 | (u32) ec->command_addr, (u32) ec->data_addr); |
1da177e4 | 547 | seq_printf(seq, "use global lock: %s\n", |
703959d4 | 548 | ec->global_lock ? "yes" : "no"); |
a86e2772 | 549 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); |
1da177e4 | 550 | |
50526df6 | 551 | end: |
d550d98d | 552 | return 0; |
1da177e4 LT |
553 | } |
554 | ||
555 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
556 | { | |
557 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
558 | } | |
559 | ||
703959d4 | 560 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
561 | .open = acpi_ec_info_open_fs, |
562 | .read = seq_read, | |
563 | .llseek = seq_lseek, | |
564 | .release = single_release, | |
1da177e4 LT |
565 | .owner = THIS_MODULE, |
566 | }; | |
567 | ||
50526df6 | 568 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 569 | { |
50526df6 | 570 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 571 | |
1da177e4 LT |
572 | if (!acpi_device_dir(device)) { |
573 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 574 | acpi_ec_dir); |
1da177e4 | 575 | if (!acpi_device_dir(device)) |
d550d98d | 576 | return -ENODEV; |
1da177e4 LT |
577 | } |
578 | ||
579 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 580 | acpi_device_dir(device)); |
1da177e4 | 581 | if (!entry) |
d550d98d | 582 | return -ENODEV; |
1da177e4 LT |
583 | else { |
584 | entry->proc_fops = &acpi_ec_info_ops; | |
585 | entry->data = acpi_driver_data(device); | |
586 | entry->owner = THIS_MODULE; | |
587 | } | |
588 | ||
d550d98d | 589 | return 0; |
1da177e4 LT |
590 | } |
591 | ||
50526df6 | 592 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 593 | { |
1da177e4 LT |
594 | |
595 | if (acpi_device_dir(device)) { | |
596 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
597 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
598 | acpi_device_dir(device) = NULL; | |
599 | } | |
600 | ||
d550d98d | 601 | return 0; |
1da177e4 LT |
602 | } |
603 | ||
1da177e4 LT |
604 | /* -------------------------------------------------------------------------- |
605 | Driver Interface | |
606 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
607 | static acpi_status |
608 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
609 | ||
610 | static acpi_status | |
611 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval); | |
612 | ||
613 | static struct acpi_ec *make_acpi_ec(void) | |
614 | { | |
615 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
616 | if (!ec) | |
617 | return NULL; | |
618 | ||
619 | atomic_set(&ec->query_pending, 0); | |
620 | atomic_set(&ec->event_count, 1); | |
621 | mutex_init(&ec->lock); | |
622 | init_waitqueue_head(&ec->wait); | |
623 | ||
624 | return ec; | |
625 | } | |
1da177e4 | 626 | |
703959d4 | 627 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 628 | { |
50526df6 | 629 | acpi_status status = AE_OK; |
703959d4 | 630 | struct acpi_ec *ec = NULL; |
45bea155 | 631 | |
45bea155 | 632 | if (!device) |
d550d98d | 633 | return -EINVAL; |
45bea155 | 634 | |
c0900c35 AS |
635 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
636 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
637 | ||
638 | ec = make_acpi_ec(); | |
45bea155 | 639 | if (!ec) |
d550d98d | 640 | return -ENOMEM; |
703959d4 | 641 | |
c0900c35 AS |
642 | status = ec_parse_device(device->handle, 0, ec, NULL); |
643 | if (status != AE_CTRL_TERMINATE) { | |
644 | kfree(ec); | |
645 | return -EINVAL; | |
45bea155 | 646 | } |
1da177e4 | 647 | |
c0900c35 | 648 | /* Check if we found the boot EC */ |
ff2fc3e9 | 649 | if (ec_ecdt) { |
c0900c35 AS |
650 | if (ec_ecdt->gpe == ec->gpe) { |
651 | /* We might have incorrect info for GL at boot time */ | |
652 | mutex_lock(&ec_ecdt->lock); | |
653 | ec_ecdt->global_lock = ec->global_lock; | |
654 | mutex_unlock(&ec_ecdt->lock); | |
655 | kfree(ec); | |
656 | ec = ec_ecdt; | |
657 | } | |
658 | } | |
451566f4 | 659 | |
c0900c35 | 660 | ec->handle = device->handle; |
1da177e4 | 661 | |
c0900c35 | 662 | acpi_driver_data(device) = ec; |
1da177e4 | 663 | |
c0900c35 AS |
664 | if (!first_ec) |
665 | first_ec = device; | |
1da177e4 | 666 | |
c0900c35 | 667 | acpi_ec_add_fs(device); |
1da177e4 | 668 | |
703959d4 | 669 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.", |
6ccedb10 AS |
670 | acpi_device_name(device), acpi_device_bid(device), |
671 | (u32) ec->gpe)); | |
1da177e4 | 672 | |
c0900c35 | 673 | return 0; |
1da177e4 LT |
674 | } |
675 | ||
50526df6 | 676 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 677 | { |
703959d4 | 678 | struct acpi_ec *ec = NULL; |
1da177e4 | 679 | |
1da177e4 | 680 | if (!device) |
d550d98d | 681 | return -EINVAL; |
1da177e4 LT |
682 | |
683 | ec = acpi_driver_data(device); | |
684 | ||
685 | acpi_ec_remove_fs(device); | |
686 | ||
c0900c35 AS |
687 | acpi_driver_data(device) = NULL; |
688 | if (device == first_ec) | |
689 | first_ec = NULL; | |
690 | ||
691 | /* Don't touch boot EC */ | |
692 | if (ec_ecdt != ec) | |
693 | kfree(ec); | |
1da177e4 | 694 | |
d550d98d | 695 | return 0; |
1da177e4 LT |
696 | } |
697 | ||
1da177e4 | 698 | static acpi_status |
c0900c35 | 699 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 700 | { |
3d02b90b | 701 | struct acpi_ec *ec = context; |
1da177e4 | 702 | |
50eca3eb | 703 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
704 | return AE_OK; |
705 | } | |
706 | ||
707 | /* | |
708 | * The first address region returned is the data port, and | |
709 | * the second address region returned is the status/command | |
710 | * port. | |
711 | */ | |
6ffb221a DS |
712 | if (ec->data_addr == 0) { |
713 | ec->data_addr = resource->data.io.minimum; | |
714 | } else if (ec->command_addr == 0) { | |
715 | ec->command_addr = resource->data.io.minimum; | |
1da177e4 LT |
716 | } else { |
717 | return AE_CTRL_TERMINATE; | |
718 | } | |
719 | ||
1da177e4 LT |
720 | return AE_OK; |
721 | } | |
722 | ||
e8284321 AS |
723 | static int ec_install_handlers(struct acpi_ec *ec) |
724 | { | |
c0900c35 AS |
725 | acpi_status status; |
726 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
727 | ACPI_GPE_EDGE_TRIGGERED, | |
728 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
729 | if (ACPI_FAILURE(status)) |
730 | return -ENODEV; | |
731 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
732 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
733 | ||
734 | status = acpi_install_address_space_handler(ec->handle, | |
735 | ACPI_ADR_SPACE_EC, | |
736 | &acpi_ec_space_handler, | |
737 | &acpi_ec_space_setup, ec); | |
738 | if (ACPI_FAILURE(status)) { | |
739 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
740 | return -ENODEV; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
50526df6 | 746 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 747 | { |
c0900c35 | 748 | struct acpi_ec *ec; |
1da177e4 | 749 | |
1da177e4 | 750 | if (!device) |
d550d98d | 751 | return -EINVAL; |
1da177e4 LT |
752 | |
753 | ec = acpi_driver_data(device); | |
754 | ||
755 | if (!ec) | |
d550d98d | 756 | return -EINVAL; |
1da177e4 | 757 | |
6ffb221a | 758 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx", |
a86e2772 | 759 | ec->gpe, ec->command_addr, ec->data_addr)); |
1da177e4 | 760 | |
c0900c35 AS |
761 | /* Boot EC is already working */ |
762 | if (ec == ec_ecdt) | |
763 | return 0; | |
764 | ||
e8284321 | 765 | return ec_install_handlers(ec); |
1da177e4 LT |
766 | } |
767 | ||
50526df6 | 768 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 769 | { |
c0900c35 AS |
770 | acpi_status status; |
771 | struct acpi_ec *ec; | |
1da177e4 | 772 | |
1da177e4 | 773 | if (!device) |
d550d98d | 774 | return -EINVAL; |
1da177e4 LT |
775 | |
776 | ec = acpi_driver_data(device); | |
c0900c35 AS |
777 | if (!ec) |
778 | return -EINVAL; | |
779 | ||
780 | /* Don't touch boot EC */ | |
781 | if (ec == ec_ecdt) | |
782 | return 0; | |
1da177e4 | 783 | |
703959d4 | 784 | status = acpi_remove_address_space_handler(ec->handle, |
50526df6 LB |
785 | ACPI_ADR_SPACE_EC, |
786 | &acpi_ec_space_handler); | |
1da177e4 | 787 | if (ACPI_FAILURE(status)) |
d550d98d | 788 | return -ENODEV; |
1da177e4 | 789 | |
6ccedb10 | 790 | status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); |
1da177e4 | 791 | if (ACPI_FAILURE(status)) |
d550d98d | 792 | return -ENODEV; |
1da177e4 | 793 | |
d550d98d | 794 | return 0; |
1da177e4 LT |
795 | } |
796 | ||
c0900c35 AS |
797 | static acpi_status |
798 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
45bea155 | 799 | { |
50526df6 | 800 | acpi_status status; |
c0900c35 AS |
801 | |
802 | struct acpi_ec *ec = context; | |
803 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
804 | ec_parse_io_ports, ec); | |
805 | if (ACPI_FAILURE(status)) | |
806 | return status; | |
807 | ||
808 | /* Get GPE bit assignment (EC events). */ | |
809 | /* TODO: Add support for _GPE returning a package */ | |
810 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); | |
811 | if (ACPI_FAILURE(status)) | |
812 | return status; | |
813 | ||
814 | /* Use the global lock for all EC transactions? */ | |
815 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
816 | ||
817 | ec->handle = handle; | |
818 | ||
819 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx", | |
820 | ec->gpe, ec->command_addr, ec->data_addr)); | |
821 | ||
822 | return AE_CTRL_TERMINATE; | |
823 | } | |
824 | ||
825 | int __init acpi_ec_ecdt_probe(void) | |
826 | { | |
827 | int ret; | |
828 | acpi_status status; | |
50526df6 | 829 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 830 | |
c0900c35 AS |
831 | ec_ecdt = make_acpi_ec(); |
832 | if (!ec_ecdt) | |
833 | return -ENOMEM; | |
834 | /* | |
835 | * Generate a boot ec context | |
836 | */ | |
837 | ||
15a58ed1 AS |
838 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
839 | (struct acpi_table_header **)&ecdt_ptr); | |
45bea155 | 840 | if (ACPI_FAILURE(status)) |
c0900c35 | 841 | goto error; |
45bea155 | 842 | |
703959d4 | 843 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT")); |
45bea155 | 844 | |
ad363f80 AS |
845 | ec_ecdt->command_addr = ecdt_ptr->control.address; |
846 | ec_ecdt->data_addr = ecdt_ptr->data.address; | |
847 | ec_ecdt->gpe = ecdt_ptr->gpe; | |
703959d4 | 848 | ec_ecdt->uid = ecdt_ptr->uid; |
e8284321 | 849 | ec_ecdt->handle = ACPI_ROOT_OBJECT; |
1da177e4 | 850 | |
e8284321 AS |
851 | ret = ec_install_handlers(ec_ecdt); |
852 | if (!ret) | |
853 | return 0; | |
c0900c35 | 854 | error: |
1da177e4 LT |
855 | kfree(ec_ecdt); |
856 | ec_ecdt = NULL; | |
857 | ||
858 | return -ENODEV; | |
859 | } | |
860 | ||
50526df6 | 861 | static int __init acpi_ec_init(void) |
1da177e4 | 862 | { |
50526df6 | 863 | int result = 0; |
1da177e4 | 864 | |
1da177e4 | 865 | if (acpi_disabled) |
d550d98d | 866 | return 0; |
1da177e4 LT |
867 | |
868 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
869 | if (!acpi_ec_dir) | |
d550d98d | 870 | return -ENODEV; |
1da177e4 LT |
871 | |
872 | /* Now register the driver for the EC */ | |
873 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
874 | if (result < 0) { | |
875 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 876 | return -ENODEV; |
1da177e4 LT |
877 | } |
878 | ||
d550d98d | 879 | return result; |
1da177e4 LT |
880 | } |
881 | ||
882 | subsys_initcall(acpi_ec_init); | |
883 | ||
884 | /* EC driver currently not unloadable */ | |
885 | #if 0 | |
50526df6 | 886 | static void __exit acpi_ec_exit(void) |
1da177e4 | 887 | { |
1da177e4 LT |
888 | |
889 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
890 | ||
891 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
892 | ||
d550d98d | 893 | return; |
1da177e4 | 894 | } |
50526df6 | 895 | #endif /* 0 */ |
1da177e4 | 896 | |
02b28a33 | 897 | static int __init acpi_ec_set_intr_mode(char *str) |
45bea155 | 898 | { |
02b28a33 | 899 | int intr; |
7b15f5e7 | 900 | |
02b28a33 | 901 | if (!get_option(&str, &intr)) |
7b15f5e7 LY |
902 | return 0; |
903 | ||
c0900c35 AS |
904 | acpi_ec_mode = (intr) ? EC_INTR : EC_POLL; |
905 | ||
9e197219 | 906 | printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling"); |
703959d4 | 907 | |
9b41046c | 908 | return 1; |
45bea155 | 909 | } |
50526df6 | 910 | |
53f11d4f | 911 | __setup("ec_intr=", acpi_ec_set_intr_mode); |