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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 |
45bea155 LY |
63 | #define EC_POLLING 0xFF |
64 | #define EC_BURST 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); | |
68 | static int acpi_ec_burst_add(struct acpi_device *device); | |
69 | static int acpi_ec_polling_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 = { | |
76 | .add = acpi_ec_polling_add, | |
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; | |
108 | } burst; | |
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; | |
119 | spinlock_t lock; | |
120 | } polling; | |
1da177e4 LT |
121 | }; |
122 | ||
50526df6 | 123 | static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event); |
45bea155 | 124 | static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event); |
50526df6 LB |
125 | static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data); |
126 | static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data); | |
127 | static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data); | |
128 | static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data); | |
129 | static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data); | |
130 | static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data); | |
131 | static void acpi_ec_gpe_polling_query(void *ec_cxt); | |
132 | static void acpi_ec_gpe_burst_query(void *ec_cxt); | |
133 | static u32 acpi_ec_gpe_polling_handler(void *data); | |
134 | static u32 acpi_ec_gpe_burst_handler(void *data); | |
45bea155 | 135 | static acpi_status __init |
50526df6 LB |
136 | acpi_fake_ecdt_polling_callback(acpi_handle handle, |
137 | u32 Level, void *context, void **retval); | |
45bea155 LY |
138 | |
139 | static acpi_status __init | |
50526df6 LB |
140 | acpi_fake_ecdt_burst_callback(acpi_handle handle, |
141 | u32 Level, void *context, void **retval); | |
142 | ||
143 | static int __init acpi_ec_polling_get_real_ecdt(void); | |
144 | static int __init acpi_ec_burst_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; | |
7b15f5e7 | 150 | static int acpi_ec_polling_mode = EC_POLLING; |
1da177e4 LT |
151 | |
152 | /* -------------------------------------------------------------------------- | |
153 | Transaction Management | |
154 | -------------------------------------------------------------------------- */ | |
155 | ||
45bea155 | 156 | static inline 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 | { |
50526df6 LB |
166 | if (acpi_ec_polling_mode) |
167 | return acpi_ec_polling_wait(ec, event); | |
45bea155 | 168 | else |
50526df6 | 169 | return acpi_ec_burst_wait(ec, event); |
45bea155 LY |
170 | } |
171 | ||
50526df6 | 172 | static int acpi_ec_polling_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 | } | |
206 | static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event) | |
451566f4 | 207 | { |
50526df6 | 208 | int result = 0; |
451566f4 DT |
209 | |
210 | ACPI_FUNCTION_TRACE("acpi_ec_wait"); | |
1da177e4 | 211 | |
45bea155 | 212 | ec->burst.expect_event = event; |
451566f4 DT |
213 | smp_mb(); |
214 | ||
716e084e LY |
215 | switch (event) { |
216 | case ACPI_EC_EVENT_OBF: | |
217 | if (acpi_ec_read_status(ec) & event) { | |
218 | ec->burst.expect_event = 0; | |
219 | return_VALUE(0); | |
220 | } | |
221 | break; | |
222 | ||
223 | case ACPI_EC_EVENT_IBE: | |
224 | if (~acpi_ec_read_status(ec) & event) { | |
225 | ec->burst.expect_event = 0; | |
226 | return_VALUE(0); | |
227 | } | |
228 | break; | |
229 | } | |
230 | ||
231 | result = wait_event_timeout(ec->burst.wait, | |
50526df6 LB |
232 | !ec->burst.expect_event, |
233 | msecs_to_jiffies(ACPI_EC_DELAY)); | |
234 | ||
45bea155 | 235 | ec->burst.expect_event = 0; |
451566f4 DT |
236 | smp_mb(); |
237 | ||
451566f4 DT |
238 | /* |
239 | * Verify that the event in question has actually happened by | |
240 | * querying EC status. Do the check even if operation timed-out | |
241 | * to make sure that we did not miss interrupt. | |
242 | */ | |
1da177e4 LT |
243 | switch (event) { |
244 | case ACPI_EC_EVENT_OBF: | |
451566f4 DT |
245 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
246 | return_VALUE(0); | |
1da177e4 | 247 | break; |
451566f4 | 248 | |
1da177e4 | 249 | case ACPI_EC_EVENT_IBE: |
451566f4 DT |
250 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
251 | return_VALUE(0); | |
1da177e4 | 252 | break; |
1da177e4 LT |
253 | } |
254 | ||
451566f4 | 255 | return_VALUE(-ETIME); |
1da177e4 LT |
256 | } |
257 | ||
50526df6 | 258 | static int acpi_ec_enter_burst_mode(union acpi_ec *ec) |
451566f4 | 259 | { |
50526df6 LB |
260 | u32 tmp = 0; |
261 | int status = 0; | |
451566f4 DT |
262 | |
263 | ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode"); | |
264 | ||
265 | status = acpi_ec_read_status(ec); | |
50526df6 | 266 | if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) { |
716e084e | 267 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 268 | if (status) |
716e084e | 269 | goto end; |
50526df6 LB |
270 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, |
271 | &ec->common.command_addr); | |
451566f4 | 272 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
716e084e | 273 | if (status) |
451566f4 | 274 | return_VALUE(-EINVAL); |
45bea155 | 275 | acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); |
50526df6 | 276 | if (tmp != 0x90) { /* Burst ACK byte */ |
451566f4 DT |
277 | return_VALUE(-EINVAL); |
278 | } | |
668d74c0 LY |
279 | } |
280 | ||
50526df6 | 281 | atomic_set(&ec->burst.leaving_burst, 0); |
451566f4 | 282 | return_VALUE(0); |
50526df6 | 283 | end: |
716e084e LY |
284 | printk("Error in acpi_ec_wait\n"); |
285 | return_VALUE(-1); | |
451566f4 DT |
286 | } |
287 | ||
50526df6 | 288 | static int acpi_ec_leave_burst_mode(union acpi_ec *ec) |
451566f4 | 289 | { |
451566f4 DT |
290 | |
291 | ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); | |
292 | ||
716e084e | 293 | atomic_set(&ec->burst.leaving_burst, 1); |
451566f4 DT |
294 | return_VALUE(0); |
295 | } | |
296 | ||
50526df6 | 297 | static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data) |
45bea155 | 298 | { |
50526df6 | 299 | if (acpi_ec_polling_mode) |
45bea155 LY |
300 | return acpi_ec_polling_read(ec, address, data); |
301 | else | |
302 | return acpi_ec_burst_read(ec, address, data); | |
303 | } | |
50526df6 | 304 | static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 305 | { |
50526df6 | 306 | if (acpi_ec_polling_mode) |
45bea155 LY |
307 | return acpi_ec_polling_write(ec, address, data); |
308 | else | |
309 | return acpi_ec_burst_write(ec, address, data); | |
310 | } | |
50526df6 | 311 | static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data) |
45bea155 | 312 | { |
50526df6 LB |
313 | acpi_status status = AE_OK; |
314 | int result = 0; | |
315 | unsigned long flags = 0; | |
316 | u32 glk = 0; | |
45bea155 LY |
317 | |
318 | ACPI_FUNCTION_TRACE("acpi_ec_read"); | |
319 | ||
320 | if (!ec || !data) | |
321 | return_VALUE(-EINVAL); | |
322 | ||
323 | *data = 0; | |
324 | ||
325 | if (ec->common.global_lock) { | |
326 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
327 | if (ACPI_FAILURE(status)) | |
328 | return_VALUE(-ENODEV); | |
329 | } | |
330 | ||
331 | spin_lock_irqsave(&ec->polling.lock, flags); | |
332 | ||
50526df6 LB |
333 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, |
334 | &ec->common.command_addr); | |
45bea155 LY |
335 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
336 | if (result) | |
337 | goto end; | |
338 | ||
339 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); | |
340 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); | |
341 | if (result) | |
342 | goto end; | |
343 | ||
344 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); | |
345 | ||
346 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", | |
50526df6 LB |
347 | *data, address)); |
348 | ||
349 | end: | |
45bea155 LY |
350 | spin_unlock_irqrestore(&ec->polling.lock, flags); |
351 | ||
352 | if (ec->common.global_lock) | |
353 | acpi_release_global_lock(glk); | |
354 | ||
355 | return_VALUE(result); | |
356 | } | |
357 | ||
50526df6 | 358 | static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data) |
45bea155 | 359 | { |
50526df6 LB |
360 | int result = 0; |
361 | acpi_status status = AE_OK; | |
362 | unsigned long flags = 0; | |
363 | u32 glk = 0; | |
45bea155 LY |
364 | |
365 | ACPI_FUNCTION_TRACE("acpi_ec_write"); | |
366 | ||
367 | if (!ec) | |
368 | return_VALUE(-EINVAL); | |
369 | ||
370 | if (ec->common.global_lock) { | |
371 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
372 | if (ACPI_FAILURE(status)) | |
373 | return_VALUE(-ENODEV); | |
374 | } | |
375 | ||
376 | spin_lock_irqsave(&ec->polling.lock, flags); | |
377 | ||
50526df6 LB |
378 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, |
379 | &ec->common.command_addr); | |
45bea155 LY |
380 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
381 | if (result) | |
382 | goto end; | |
383 | ||
384 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); | |
385 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
386 | if (result) | |
387 | goto end; | |
388 | ||
389 | acpi_hw_low_level_write(8, data, &ec->common.data_addr); | |
390 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
391 | if (result) | |
392 | goto end; | |
393 | ||
394 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
50526df6 | 395 | data, address)); |
45bea155 | 396 | |
50526df6 | 397 | end: |
45bea155 LY |
398 | spin_unlock_irqrestore(&ec->polling.lock, flags); |
399 | ||
400 | if (ec->common.global_lock) | |
401 | acpi_release_global_lock(glk); | |
402 | ||
403 | return_VALUE(result); | |
404 | } | |
405 | ||
50526df6 | 406 | static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data) |
1da177e4 | 407 | { |
50526df6 LB |
408 | int status = 0; |
409 | u32 glk; | |
1da177e4 LT |
410 | |
411 | ACPI_FUNCTION_TRACE("acpi_ec_read"); | |
412 | ||
413 | if (!ec || !data) | |
414 | return_VALUE(-EINVAL); | |
415 | ||
416 | *data = 0; | |
417 | ||
45bea155 | 418 | if (ec->common.global_lock) { |
1da177e4 LT |
419 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
420 | if (ACPI_FAILURE(status)) | |
421 | return_VALUE(-ENODEV); | |
422 | } | |
451566f4 DT |
423 | |
424 | WARN_ON(in_interrupt()); | |
45bea155 | 425 | down(&ec->burst.sem); |
451566f4 | 426 | |
716e084e LY |
427 | acpi_ec_enter_burst_mode(ec); |
428 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
429 | if (status) { | |
430 | printk("read EC, IB not empty\n"); | |
451566f4 | 431 | goto end; |
716e084e | 432 | } |
50526df6 LB |
433 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, |
434 | &ec->common.command_addr); | |
451566f4 | 435 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
451566f4 | 436 | if (status) { |
716e084e | 437 | printk("read EC, IB not empty\n"); |
451566f4 | 438 | } |
1da177e4 | 439 | |
45bea155 | 440 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); |
50526df6 LB |
441 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
442 | if (status) { | |
716e084e | 443 | printk("read EC, OB not full\n"); |
1da177e4 | 444 | goto end; |
451566f4 | 445 | } |
45bea155 | 446 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); |
1da177e4 | 447 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", |
50526df6 LB |
448 | *data, address)); |
449 | ||
450 | end: | |
451566f4 | 451 | acpi_ec_leave_burst_mode(ec); |
45bea155 | 452 | up(&ec->burst.sem); |
1da177e4 | 453 | |
45bea155 | 454 | if (ec->common.global_lock) |
1da177e4 LT |
455 | acpi_release_global_lock(glk); |
456 | ||
451566f4 | 457 | return_VALUE(status); |
1da177e4 LT |
458 | } |
459 | ||
50526df6 | 460 | static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data) |
1da177e4 | 461 | { |
50526df6 LB |
462 | int status = 0; |
463 | u32 glk; | |
1da177e4 LT |
464 | |
465 | ACPI_FUNCTION_TRACE("acpi_ec_write"); | |
466 | ||
467 | if (!ec) | |
468 | return_VALUE(-EINVAL); | |
716e084e | 469 | |
45bea155 | 470 | if (ec->common.global_lock) { |
1da177e4 LT |
471 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
472 | if (ACPI_FAILURE(status)) | |
473 | return_VALUE(-ENODEV); | |
474 | } | |
475 | ||
451566f4 | 476 | WARN_ON(in_interrupt()); |
45bea155 | 477 | down(&ec->burst.sem); |
451566f4 | 478 | |
716e084e | 479 | acpi_ec_enter_burst_mode(ec); |
451566f4 | 480 | |
716e084e | 481 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 482 | if (status) { |
716e084e | 483 | printk("write EC, IB not empty\n"); |
451566f4 | 484 | } |
50526df6 LB |
485 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, |
486 | &ec->common.command_addr); | |
451566f4 | 487 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
716e084e | 488 | if (status) { |
50526df6 | 489 | printk("write EC, IB not empty\n"); |
451566f4 | 490 | } |
1da177e4 | 491 | |
45bea155 | 492 | acpi_hw_low_level_write(8, address, &ec->common.data_addr); |
451566f4 | 493 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
50526df6 | 494 | if (status) { |
716e084e | 495 | printk("write EC, IB not empty\n"); |
451566f4 | 496 | } |
1da177e4 | 497 | |
45bea155 | 498 | acpi_hw_low_level_write(8, data, &ec->common.data_addr); |
1da177e4 LT |
499 | |
500 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", | |
50526df6 | 501 | data, address)); |
1da177e4 | 502 | |
451566f4 | 503 | acpi_ec_leave_burst_mode(ec); |
45bea155 | 504 | up(&ec->burst.sem); |
1da177e4 | 505 | |
45bea155 | 506 | if (ec->common.global_lock) |
1da177e4 LT |
507 | acpi_release_global_lock(glk); |
508 | ||
451566f4 | 509 | return_VALUE(status); |
1da177e4 LT |
510 | } |
511 | ||
512 | /* | |
513 | * Externally callable EC access functions. For now, assume 1 EC only | |
514 | */ | |
50526df6 | 515 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 516 | { |
45bea155 | 517 | union acpi_ec *ec; |
1da177e4 LT |
518 | int err; |
519 | u32 temp_data; | |
520 | ||
521 | if (!first_ec) | |
522 | return -ENODEV; | |
523 | ||
524 | ec = acpi_driver_data(first_ec); | |
525 | ||
526 | err = acpi_ec_read(ec, addr, &temp_data); | |
527 | ||
528 | if (!err) { | |
529 | *val = temp_data; | |
530 | return 0; | |
50526df6 | 531 | } else |
1da177e4 LT |
532 | return err; |
533 | } | |
50526df6 | 534 | |
1da177e4 LT |
535 | EXPORT_SYMBOL(ec_read); |
536 | ||
50526df6 | 537 | int ec_write(u8 addr, u8 val) |
1da177e4 | 538 | { |
45bea155 | 539 | union acpi_ec *ec; |
1da177e4 LT |
540 | int err; |
541 | ||
542 | if (!first_ec) | |
543 | return -ENODEV; | |
544 | ||
545 | ec = acpi_driver_data(first_ec); | |
546 | ||
547 | err = acpi_ec_write(ec, addr, val); | |
548 | ||
549 | return err; | |
550 | } | |
50526df6 | 551 | |
1da177e4 LT |
552 | EXPORT_SYMBOL(ec_write); |
553 | ||
50526df6 | 554 | static int acpi_ec_query(union acpi_ec *ec, u32 * data) |
45bea155 | 555 | { |
50526df6 | 556 | if (acpi_ec_polling_mode) |
45bea155 LY |
557 | return acpi_ec_polling_query(ec, data); |
558 | else | |
559 | return acpi_ec_burst_query(ec, data); | |
560 | } | |
50526df6 | 561 | static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data) |
45bea155 | 562 | { |
50526df6 LB |
563 | int result = 0; |
564 | acpi_status status = AE_OK; | |
565 | unsigned long flags = 0; | |
566 | u32 glk = 0; | |
45bea155 LY |
567 | |
568 | ACPI_FUNCTION_TRACE("acpi_ec_query"); | |
569 | ||
570 | if (!ec || !data) | |
571 | return_VALUE(-EINVAL); | |
572 | ||
573 | *data = 0; | |
574 | ||
575 | if (ec->common.global_lock) { | |
576 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); | |
577 | if (ACPI_FAILURE(status)) | |
578 | return_VALUE(-ENODEV); | |
579 | } | |
580 | ||
581 | /* | |
582 | * Query the EC to find out which _Qxx method we need to evaluate. | |
583 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
584 | * bit to be cleared (and thus clearing the interrupt source). | |
585 | */ | |
586 | spin_lock_irqsave(&ec->polling.lock, flags); | |
587 | ||
50526df6 LB |
588 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, |
589 | &ec->common.command_addr); | |
45bea155 LY |
590 | result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
591 | if (result) | |
592 | goto end; | |
593 | ||
594 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); | |
595 | if (!*data) | |
596 | result = -ENODATA; | |
597 | ||
50526df6 | 598 | end: |
45bea155 LY |
599 | spin_unlock_irqrestore(&ec->polling.lock, flags); |
600 | ||
601 | if (ec->common.global_lock) | |
602 | acpi_release_global_lock(glk); | |
603 | ||
604 | return_VALUE(result); | |
605 | } | |
50526df6 | 606 | static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data) |
1da177e4 | 607 | { |
50526df6 LB |
608 | int status = 0; |
609 | u32 glk; | |
1da177e4 LT |
610 | |
611 | ACPI_FUNCTION_TRACE("acpi_ec_query"); | |
612 | ||
613 | if (!ec || !data) | |
614 | return_VALUE(-EINVAL); | |
1da177e4 LT |
615 | *data = 0; |
616 | ||
45bea155 | 617 | if (ec->common.global_lock) { |
1da177e4 LT |
618 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
619 | if (ACPI_FAILURE(status)) | |
620 | return_VALUE(-ENODEV); | |
621 | } | |
622 | ||
45bea155 | 623 | down(&ec->burst.sem); |
716e084e LY |
624 | |
625 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); | |
626 | if (status) { | |
627 | printk("query EC, IB not empty\n"); | |
451566f4 | 628 | goto end; |
716e084e | 629 | } |
1da177e4 LT |
630 | /* |
631 | * Query the EC to find out which _Qxx method we need to evaluate. | |
632 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
633 | * bit to be cleared (and thus clearing the interrupt source). | |
634 | */ | |
50526df6 LB |
635 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, |
636 | &ec->common.command_addr); | |
451566f4 | 637 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
50526df6 | 638 | if (status) { |
716e084e | 639 | printk("query EC, OB not full\n"); |
1da177e4 | 640 | goto end; |
451566f4 DT |
641 | } |
642 | ||
45bea155 | 643 | acpi_hw_low_level_read(8, data, &ec->common.data_addr); |
1da177e4 | 644 | if (!*data) |
451566f4 | 645 | status = -ENODATA; |
1da177e4 | 646 | |
50526df6 | 647 | end: |
45bea155 | 648 | up(&ec->burst.sem); |
1da177e4 | 649 | |
45bea155 | 650 | if (ec->common.global_lock) |
1da177e4 LT |
651 | acpi_release_global_lock(glk); |
652 | ||
451566f4 | 653 | return_VALUE(status); |
1da177e4 LT |
654 | } |
655 | ||
1da177e4 LT |
656 | /* -------------------------------------------------------------------------- |
657 | Event Management | |
658 | -------------------------------------------------------------------------- */ | |
659 | ||
45bea155 | 660 | union acpi_ec_query_data { |
50526df6 LB |
661 | acpi_handle handle; |
662 | u8 data; | |
1da177e4 LT |
663 | }; |
664 | ||
50526df6 | 665 | static void acpi_ec_gpe_query(void *ec_cxt) |
1da177e4 | 666 | { |
50526df6 | 667 | if (acpi_ec_polling_mode) |
45bea155 LY |
668 | acpi_ec_gpe_polling_query(ec_cxt); |
669 | else | |
670 | acpi_ec_gpe_burst_query(ec_cxt); | |
671 | } | |
672 | ||
50526df6 | 673 | static void acpi_ec_gpe_polling_query(void *ec_cxt) |
45bea155 | 674 | { |
50526df6 LB |
675 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
676 | u32 value = 0; | |
677 | unsigned long flags = 0; | |
678 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; | |
679 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
680 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
681 | }; | |
45bea155 LY |
682 | |
683 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); | |
684 | ||
685 | if (!ec_cxt) | |
686 | goto end; | |
687 | ||
688 | spin_lock_irqsave(&ec->polling.lock, flags); | |
689 | acpi_hw_low_level_read(8, &value, &ec->common.command_addr); | |
690 | spin_unlock_irqrestore(&ec->polling.lock, flags); | |
691 | ||
692 | /* TBD: Implement asynch events! | |
693 | * NOTE: All we care about are EC-SCI's. Other EC events are | |
694 | * handled via polling (yuck!). This is because some systems | |
695 | * treat EC-SCIs as level (versus EDGE!) triggered, preventing | |
696 | * a purely interrupt-driven approach (grumble, grumble). | |
697 | */ | |
698 | if (!(value & ACPI_EC_FLAG_SCI)) | |
699 | goto end; | |
700 | ||
701 | if (acpi_ec_query(ec, &value)) | |
702 | goto end; | |
703 | ||
704 | object_name[2] = hex[((value >> 4) & 0x0F)]; | |
705 | object_name[3] = hex[(value & 0x0F)]; | |
706 | ||
707 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
708 | ||
709 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); | |
710 | ||
50526df6 | 711 | end: |
45bea155 LY |
712 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
713 | } | |
50526df6 | 714 | static void acpi_ec_gpe_burst_query(void *ec_cxt) |
45bea155 | 715 | { |
50526df6 LB |
716 | union acpi_ec *ec = (union acpi_ec *)ec_cxt; |
717 | u32 value; | |
718 | int result = -ENODATA; | |
719 | static char object_name[5] = { '_', 'Q', '0', '0', '\0' }; | |
720 | const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
721 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
722 | }; | |
1da177e4 LT |
723 | |
724 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); | |
725 | ||
451566f4 DT |
726 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
727 | result = acpi_ec_query(ec, &value); | |
1da177e4 | 728 | |
451566f4 | 729 | if (result) |
1da177e4 LT |
730 | goto end; |
731 | ||
1da177e4 LT |
732 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
733 | object_name[3] = hex[(value & 0x0F)]; | |
734 | ||
735 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); | |
736 | ||
45bea155 | 737 | acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL); |
50526df6 | 738 | end: |
45bea155 | 739 | atomic_dec(&ec->burst.pending_gpe); |
451566f4 | 740 | return; |
1da177e4 LT |
741 | } |
742 | ||
50526df6 | 743 | static u32 acpi_ec_gpe_handler(void *data) |
45bea155 | 744 | { |
50526df6 | 745 | if (acpi_ec_polling_mode) |
45bea155 LY |
746 | return acpi_ec_gpe_polling_handler(data); |
747 | else | |
50526df6 | 748 | return acpi_ec_gpe_burst_handler(data); |
45bea155 | 749 | } |
50526df6 | 750 | static u32 acpi_ec_gpe_polling_handler(void *data) |
45bea155 | 751 | { |
50526df6 LB |
752 | acpi_status status = AE_OK; |
753 | union acpi_ec *ec = (union acpi_ec *)data; | |
45bea155 LY |
754 | |
755 | if (!ec) | |
756 | return ACPI_INTERRUPT_NOT_HANDLED; | |
757 | ||
758 | acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); | |
759 | ||
760 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, | |
50526df6 | 761 | acpi_ec_gpe_query, ec); |
45bea155 LY |
762 | |
763 | if (status == AE_OK) | |
764 | return ACPI_INTERRUPT_HANDLED; | |
765 | else | |
766 | return ACPI_INTERRUPT_NOT_HANDLED; | |
767 | } | |
50526df6 | 768 | static u32 acpi_ec_gpe_burst_handler(void *data) |
1da177e4 | 769 | { |
50526df6 LB |
770 | acpi_status status = AE_OK; |
771 | u32 value; | |
772 | union acpi_ec *ec = (union acpi_ec *)data; | |
1da177e4 LT |
773 | |
774 | if (!ec) | |
775 | return ACPI_INTERRUPT_NOT_HANDLED; | |
776 | ||
716e084e | 777 | acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 778 | value = acpi_ec_read_status(ec); |
1da177e4 | 779 | |
50526df6 | 780 | switch (ec->burst.expect_event) { |
716e084e LY |
781 | case ACPI_EC_EVENT_OBF: |
782 | if (!(value & ACPI_EC_FLAG_OBF)) | |
783 | break; | |
784 | case ACPI_EC_EVENT_IBE: | |
785 | if ((value & ACPI_EC_FLAG_IBF)) | |
786 | break; | |
787 | ec->burst.expect_event = 0; | |
45bea155 | 788 | wake_up(&ec->burst.wait); |
716e084e LY |
789 | return ACPI_INTERRUPT_HANDLED; |
790 | default: | |
791 | break; | |
451566f4 DT |
792 | } |
793 | ||
50526df6 LB |
794 | if (value & ACPI_EC_FLAG_SCI) { |
795 | atomic_add(1, &ec->burst.pending_gpe); | |
451566f4 | 796 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, |
50526df6 | 797 | acpi_ec_gpe_query, ec); |
17e9c78a | 798 | return status == AE_OK ? |
50526df6 LB |
799 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
800 | } | |
45bea155 | 801 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); |
451566f4 | 802 | return status == AE_OK ? |
50526df6 | 803 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
1da177e4 LT |
804 | } |
805 | ||
806 | /* -------------------------------------------------------------------------- | |
807 | Address Space Management | |
808 | -------------------------------------------------------------------------- */ | |
809 | ||
810 | static acpi_status | |
50526df6 LB |
811 | acpi_ec_space_setup(acpi_handle region_handle, |
812 | u32 function, void *handler_context, void **return_context) | |
1da177e4 LT |
813 | { |
814 | /* | |
815 | * The EC object is in the handler context and is needed | |
816 | * when calling the acpi_ec_space_handler. | |
817 | */ | |
50526df6 LB |
818 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
819 | handler_context : NULL; | |
1da177e4 LT |
820 | |
821 | return AE_OK; | |
822 | } | |
823 | ||
1da177e4 | 824 | static acpi_status |
50526df6 LB |
825 | acpi_ec_space_handler(u32 function, |
826 | acpi_physical_address address, | |
827 | u32 bit_width, | |
828 | acpi_integer * value, | |
829 | void *handler_context, void *region_context) | |
1da177e4 | 830 | { |
50526df6 LB |
831 | int result = 0; |
832 | union acpi_ec *ec = NULL; | |
833 | u64 temp = *value; | |
834 | acpi_integer f_v = 0; | |
835 | int i = 0; | |
1da177e4 LT |
836 | |
837 | ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); | |
838 | ||
839 | if ((address > 0xFF) || !value || !handler_context) | |
840 | return_VALUE(AE_BAD_PARAMETER); | |
841 | ||
fa9cd547 | 842 | if (bit_width != 8 && acpi_strict) { |
50526df6 LB |
843 | printk(KERN_WARNING PREFIX |
844 | "acpi_ec_space_handler: bit_width should be 8\n"); | |
fa9cd547 | 845 | return_VALUE(AE_BAD_PARAMETER); |
1da177e4 LT |
846 | } |
847 | ||
50526df6 | 848 | ec = (union acpi_ec *)handler_context; |
1da177e4 | 849 | |
50526df6 | 850 | next_byte: |
1da177e4 LT |
851 | switch (function) { |
852 | case ACPI_READ: | |
fa9cd547 | 853 | temp = 0; |
50526df6 | 854 | result = acpi_ec_read(ec, (u8) address, (u32 *) & temp); |
1da177e4 LT |
855 | break; |
856 | case ACPI_WRITE: | |
fa9cd547 | 857 | result = acpi_ec_write(ec, (u8) address, (u8) temp); |
1da177e4 LT |
858 | break; |
859 | default: | |
860 | result = -EINVAL; | |
861 | goto out; | |
862 | break; | |
863 | } | |
864 | ||
865 | bit_width -= 8; | |
fa9cd547 LY |
866 | if (bit_width) { |
867 | if (function == ACPI_READ) | |
868 | f_v |= temp << 8 * i; | |
869 | if (function == ACPI_WRITE) | |
870 | temp >>= 8; | |
1da177e4 | 871 | i++; |
83ea7445 | 872 | address++; |
1da177e4 LT |
873 | goto next_byte; |
874 | } | |
875 | ||
fa9cd547 LY |
876 | if (function == ACPI_READ) { |
877 | f_v |= temp << 8 * i; | |
1da177e4 LT |
878 | *value = f_v; |
879 | } | |
880 | ||
50526df6 | 881 | out: |
1da177e4 LT |
882 | switch (result) { |
883 | case -EINVAL: | |
884 | return_VALUE(AE_BAD_PARAMETER); | |
885 | break; | |
886 | case -ENODEV: | |
887 | return_VALUE(AE_NOT_FOUND); | |
888 | break; | |
889 | case -ETIME: | |
890 | return_VALUE(AE_TIME); | |
891 | break; | |
892 | default: | |
893 | return_VALUE(AE_OK); | |
894 | } | |
1da177e4 LT |
895 | } |
896 | ||
1da177e4 LT |
897 | /* -------------------------------------------------------------------------- |
898 | FS Interface (/proc) | |
899 | -------------------------------------------------------------------------- */ | |
900 | ||
50526df6 | 901 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 902 | |
50526df6 | 903 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 904 | { |
50526df6 | 905 | union acpi_ec *ec = (union acpi_ec *)seq->private; |
1da177e4 LT |
906 | |
907 | ACPI_FUNCTION_TRACE("acpi_ec_read_info"); | |
908 | ||
909 | if (!ec) | |
910 | goto end; | |
911 | ||
912 | seq_printf(seq, "gpe bit: 0x%02x\n", | |
50526df6 | 913 | (u32) ec->common.gpe_bit); |
1da177e4 | 914 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
50526df6 LB |
915 | (u32) ec->common.status_addr.address, |
916 | (u32) ec->common.data_addr.address); | |
1da177e4 | 917 | seq_printf(seq, "use global lock: %s\n", |
50526df6 | 918 | ec->common.global_lock ? "yes" : "no"); |
45bea155 | 919 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); |
1da177e4 | 920 | |
50526df6 | 921 | end: |
1da177e4 LT |
922 | return_VALUE(0); |
923 | } | |
924 | ||
925 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
926 | { | |
927 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
928 | } | |
929 | ||
930 | static struct file_operations acpi_ec_info_ops = { | |
50526df6 LB |
931 | .open = acpi_ec_info_open_fs, |
932 | .read = seq_read, | |
933 | .llseek = seq_lseek, | |
934 | .release = single_release, | |
1da177e4 LT |
935 | .owner = THIS_MODULE, |
936 | }; | |
937 | ||
50526df6 | 938 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 939 | { |
50526df6 | 940 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
941 | |
942 | ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); | |
943 | ||
944 | if (!acpi_device_dir(device)) { | |
945 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 946 | acpi_ec_dir); |
1da177e4 LT |
947 | if (!acpi_device_dir(device)) |
948 | return_VALUE(-ENODEV); | |
949 | } | |
950 | ||
951 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, | |
50526df6 | 952 | acpi_device_dir(device)); |
1da177e4 LT |
953 | if (!entry) |
954 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
50526df6 LB |
955 | "Unable to create '%s' fs entry\n", |
956 | ACPI_EC_FILE_INFO)); | |
1da177e4 LT |
957 | else { |
958 | entry->proc_fops = &acpi_ec_info_ops; | |
959 | entry->data = acpi_driver_data(device); | |
960 | entry->owner = THIS_MODULE; | |
961 | } | |
962 | ||
963 | return_VALUE(0); | |
964 | } | |
965 | ||
50526df6 | 966 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 LT |
967 | { |
968 | ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); | |
969 | ||
970 | if (acpi_device_dir(device)) { | |
971 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
972 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
973 | acpi_device_dir(device) = NULL; | |
974 | } | |
975 | ||
976 | return_VALUE(0); | |
977 | } | |
978 | ||
1da177e4 LT |
979 | /* -------------------------------------------------------------------------- |
980 | Driver Interface | |
981 | -------------------------------------------------------------------------- */ | |
982 | ||
50526df6 | 983 | static int acpi_ec_polling_add(struct acpi_device *device) |
1da177e4 | 984 | { |
50526df6 LB |
985 | int result = 0; |
986 | acpi_status status = AE_OK; | |
987 | union acpi_ec *ec = NULL; | |
988 | unsigned long uid; | |
45bea155 LY |
989 | |
990 | ACPI_FUNCTION_TRACE("acpi_ec_add"); | |
991 | ||
992 | if (!device) | |
993 | return_VALUE(-EINVAL); | |
994 | ||
995 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
996 | if (!ec) | |
997 | return_VALUE(-ENOMEM); | |
998 | memset(ec, 0, sizeof(union acpi_ec)); | |
999 | ||
1000 | ec->common.handle = device->handle; | |
1001 | ec->common.uid = -1; | |
1002 | spin_lock_init(&ec->polling.lock); | |
1003 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); | |
1004 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1005 | acpi_driver_data(device) = ec; | |
1006 | ||
1007 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1008 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1009 | &ec->common.global_lock); | |
45bea155 LY |
1010 | |
1011 | /* If our UID matches the UID for the ECDT-enumerated EC, | |
50526df6 | 1012 | we now have the *real* EC info, so kill the makeshift one. */ |
45bea155 LY |
1013 | acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid); |
1014 | if (ec_ecdt && ec_ecdt->common.uid == uid) { | |
1015 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, | |
50526df6 LB |
1016 | ACPI_ADR_SPACE_EC, |
1017 | &acpi_ec_space_handler); | |
1018 | ||
1019 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, | |
1020 | &acpi_ec_gpe_handler); | |
45bea155 LY |
1021 | |
1022 | kfree(ec_ecdt); | |
1023 | } | |
1024 | ||
1025 | /* Get GPE bit assignment (EC events). */ | |
1026 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1027 | status = |
1028 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1029 | &ec->common.gpe_bit); | |
45bea155 LY |
1030 | if (ACPI_FAILURE(status)) { |
1031 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
50526df6 | 1032 | "Error obtaining GPE bit assignment\n")); |
45bea155 LY |
1033 | result = -ENODEV; |
1034 | goto end; | |
1035 | } | |
1036 | ||
1037 | result = acpi_ec_add_fs(device); | |
1038 | if (result) | |
1039 | goto end; | |
1040 | ||
1041 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", | |
50526df6 LB |
1042 | acpi_device_name(device), acpi_device_bid(device), |
1043 | (u32) ec->common.gpe_bit); | |
45bea155 LY |
1044 | |
1045 | if (!first_ec) | |
1046 | first_ec = device; | |
1047 | ||
50526df6 | 1048 | end: |
45bea155 LY |
1049 | if (result) |
1050 | kfree(ec); | |
1051 | ||
1052 | return_VALUE(result); | |
1053 | } | |
50526df6 | 1054 | static int acpi_ec_burst_add(struct acpi_device *device) |
45bea155 | 1055 | { |
50526df6 LB |
1056 | int result = 0; |
1057 | acpi_status status = AE_OK; | |
1058 | union acpi_ec *ec = NULL; | |
1059 | unsigned long uid; | |
1da177e4 LT |
1060 | |
1061 | ACPI_FUNCTION_TRACE("acpi_ec_add"); | |
1062 | ||
1063 | if (!device) | |
1064 | return_VALUE(-EINVAL); | |
1065 | ||
45bea155 | 1066 | ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1067 | if (!ec) |
1068 | return_VALUE(-ENOMEM); | |
45bea155 LY |
1069 | memset(ec, 0, sizeof(union acpi_ec)); |
1070 | ||
1071 | ec->common.handle = device->handle; | |
1072 | ec->common.uid = -1; | |
50526df6 LB |
1073 | atomic_set(&ec->burst.pending_gpe, 0); |
1074 | atomic_set(&ec->burst.leaving_burst, 1); | |
1075 | init_MUTEX(&ec->burst.sem); | |
1076 | init_waitqueue_head(&ec->burst.wait); | |
1da177e4 LT |
1077 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
1078 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
1079 | acpi_driver_data(device) = ec; | |
1080 | ||
1081 | /* Use the global lock for all EC transactions? */ | |
50526df6 LB |
1082 | acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, |
1083 | &ec->common.global_lock); | |
1da177e4 LT |
1084 | |
1085 | /* If our UID matches the UID for the ECDT-enumerated EC, | |
50526df6 | 1086 | we now have the *real* EC info, so kill the makeshift one. */ |
45bea155 LY |
1087 | acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid); |
1088 | if (ec_ecdt && ec_ecdt->common.uid == uid) { | |
1da177e4 | 1089 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50526df6 LB |
1090 | ACPI_ADR_SPACE_EC, |
1091 | &acpi_ec_space_handler); | |
451566f4 | 1092 | |
50526df6 LB |
1093 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
1094 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
1095 | |
1096 | kfree(ec_ecdt); | |
1097 | } | |
1098 | ||
1099 | /* Get GPE bit assignment (EC events). */ | |
1100 | /* TODO: Add support for _GPE returning a package */ | |
50526df6 LB |
1101 | status = |
1102 | acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, | |
1103 | &ec->common.gpe_bit); | |
1da177e4 LT |
1104 | if (ACPI_FAILURE(status)) { |
1105 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
50526df6 | 1106 | "Error obtaining GPE bit assignment\n")); |
1da177e4 LT |
1107 | result = -ENODEV; |
1108 | goto end; | |
1109 | } | |
1110 | ||
1111 | result = acpi_ec_add_fs(device); | |
1112 | if (result) | |
1113 | goto end; | |
1114 | ||
716e084e | 1115 | printk("burst-mode-ec-10-Aug\n"); |
1da177e4 | 1116 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", |
50526df6 LB |
1117 | acpi_device_name(device), acpi_device_bid(device), |
1118 | (u32) ec->common.gpe_bit); | |
1da177e4 LT |
1119 | |
1120 | if (!first_ec) | |
1121 | first_ec = device; | |
1122 | ||
50526df6 | 1123 | end: |
1da177e4 LT |
1124 | if (result) |
1125 | kfree(ec); | |
1126 | ||
1127 | return_VALUE(result); | |
1128 | } | |
1129 | ||
50526df6 | 1130 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 1131 | { |
50526df6 | 1132 | union acpi_ec *ec = NULL; |
1da177e4 LT |
1133 | |
1134 | ACPI_FUNCTION_TRACE("acpi_ec_remove"); | |
1135 | ||
1136 | if (!device) | |
1137 | return_VALUE(-EINVAL); | |
1138 | ||
1139 | ec = acpi_driver_data(device); | |
1140 | ||
1141 | acpi_ec_remove_fs(device); | |
1142 | ||
1143 | kfree(ec); | |
1144 | ||
1145 | return_VALUE(0); | |
1146 | } | |
1147 | ||
1da177e4 | 1148 | static acpi_status |
50526df6 | 1149 | acpi_ec_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 1150 | { |
50526df6 | 1151 | union acpi_ec *ec = (union acpi_ec *)context; |
1da177e4 LT |
1152 | struct acpi_generic_address *addr; |
1153 | ||
50eca3eb | 1154 | if (resource->type != ACPI_RESOURCE_TYPE_IO) { |
1da177e4 LT |
1155 | return AE_OK; |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * The first address region returned is the data port, and | |
1160 | * the second address region returned is the status/command | |
1161 | * port. | |
1162 | */ | |
45bea155 LY |
1163 | if (ec->common.data_addr.register_bit_width == 0) { |
1164 | addr = &ec->common.data_addr; | |
1165 | } else if (ec->common.command_addr.register_bit_width == 0) { | |
1166 | addr = &ec->common.command_addr; | |
1da177e4 LT |
1167 | } else { |
1168 | return AE_CTRL_TERMINATE; | |
1169 | } | |
1170 | ||
1171 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; | |
1172 | addr->register_bit_width = 8; | |
1173 | addr->register_bit_offset = 0; | |
50eca3eb | 1174 | addr->address = resource->data.io.minimum; |
1da177e4 LT |
1175 | |
1176 | return AE_OK; | |
1177 | } | |
1178 | ||
50526df6 | 1179 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 1180 | { |
50526df6 LB |
1181 | acpi_status status = AE_OK; |
1182 | union acpi_ec *ec = NULL; | |
1da177e4 LT |
1183 | |
1184 | ACPI_FUNCTION_TRACE("acpi_ec_start"); | |
1185 | ||
1186 | if (!device) | |
1187 | return_VALUE(-EINVAL); | |
1188 | ||
1189 | ec = acpi_driver_data(device); | |
1190 | ||
1191 | if (!ec) | |
1192 | return_VALUE(-EINVAL); | |
1193 | ||
1194 | /* | |
1195 | * Get I/O port addresses. Convert to GAS format. | |
1196 | */ | |
45bea155 | 1197 | status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS, |
50526df6 LB |
1198 | acpi_ec_io_ports, ec); |
1199 | if (ACPI_FAILURE(status) | |
1200 | || ec->common.command_addr.register_bit_width == 0) { | |
1201 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
1202 | "Error getting I/O port addresses")); | |
1da177e4 LT |
1203 | return_VALUE(-ENODEV); |
1204 | } | |
1205 | ||
45bea155 | 1206 | ec->common.status_addr = ec->common.command_addr; |
1da177e4 LT |
1207 | |
1208 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", | |
50526df6 LB |
1209 | (u32) ec->common.gpe_bit, |
1210 | (u32) ec->common.command_addr.address, | |
1211 | (u32) ec->common.data_addr.address)); | |
1da177e4 LT |
1212 | |
1213 | /* | |
1214 | * Install GPE handler | |
1215 | */ | |
45bea155 | 1216 | status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit, |
50526df6 LB |
1217 | ACPI_GPE_EDGE_TRIGGERED, |
1218 | &acpi_ec_gpe_handler, ec); | |
1da177e4 LT |
1219 | if (ACPI_FAILURE(status)) { |
1220 | return_VALUE(-ENODEV); | |
1221 | } | |
50526df6 LB |
1222 | acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1223 | acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); | |
1da177e4 | 1224 | |
50526df6 LB |
1225 | status = acpi_install_address_space_handler(ec->common.handle, |
1226 | ACPI_ADR_SPACE_EC, | |
1227 | &acpi_ec_space_handler, | |
1228 | &acpi_ec_space_setup, ec); | |
1da177e4 | 1229 | if (ACPI_FAILURE(status)) { |
50526df6 LB |
1230 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, |
1231 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
1232 | return_VALUE(-ENODEV); |
1233 | } | |
1234 | ||
1235 | return_VALUE(AE_OK); | |
1236 | } | |
1237 | ||
50526df6 | 1238 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 1239 | { |
50526df6 LB |
1240 | acpi_status status = AE_OK; |
1241 | union acpi_ec *ec = NULL; | |
1da177e4 LT |
1242 | |
1243 | ACPI_FUNCTION_TRACE("acpi_ec_stop"); | |
1244 | ||
1245 | if (!device) | |
1246 | return_VALUE(-EINVAL); | |
1247 | ||
1248 | ec = acpi_driver_data(device); | |
1249 | ||
45bea155 | 1250 | status = acpi_remove_address_space_handler(ec->common.handle, |
50526df6 LB |
1251 | ACPI_ADR_SPACE_EC, |
1252 | &acpi_ec_space_handler); | |
1da177e4 LT |
1253 | if (ACPI_FAILURE(status)) |
1254 | return_VALUE(-ENODEV); | |
1255 | ||
50526df6 LB |
1256 | status = |
1257 | acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, | |
1258 | &acpi_ec_gpe_handler); | |
1da177e4 LT |
1259 | if (ACPI_FAILURE(status)) |
1260 | return_VALUE(-ENODEV); | |
1261 | ||
1262 | return_VALUE(0); | |
1263 | } | |
1264 | ||
1265 | static acpi_status __init | |
50526df6 LB |
1266 | acpi_fake_ecdt_callback(acpi_handle handle, |
1267 | u32 Level, void *context, void **retval) | |
1da177e4 | 1268 | { |
45bea155 LY |
1269 | |
1270 | if (acpi_ec_polling_mode) | |
1271 | return acpi_fake_ecdt_polling_callback(handle, | |
50526df6 | 1272 | Level, context, retval); |
45bea155 LY |
1273 | else |
1274 | return acpi_fake_ecdt_burst_callback(handle, | |
50526df6 | 1275 | Level, context, retval); |
45bea155 LY |
1276 | } |
1277 | ||
1278 | static acpi_status __init | |
50526df6 LB |
1279 | acpi_fake_ecdt_polling_callback(acpi_handle handle, |
1280 | u32 Level, void *context, void **retval) | |
45bea155 | 1281 | { |
50526df6 | 1282 | acpi_status status; |
45bea155 LY |
1283 | |
1284 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
50526df6 | 1285 | acpi_ec_io_ports, ec_ecdt); |
45bea155 LY |
1286 | if (ACPI_FAILURE(status)) |
1287 | return status; | |
1288 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; | |
1289 | ||
1290 | ec_ecdt->common.uid = -1; | |
1291 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1292 | ||
50526df6 LB |
1293 | status = |
1294 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1295 | &ec_ecdt->common.gpe_bit); | |
45bea155 LY |
1296 | if (ACPI_FAILURE(status)) |
1297 | return status; | |
1298 | spin_lock_init(&ec_ecdt->polling.lock); | |
1299 | ec_ecdt->common.global_lock = TRUE; | |
1300 | ec_ecdt->common.handle = handle; | |
1301 | ||
50526df6 LB |
1302 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1303 | (u32) ec_ecdt->common.gpe_bit, | |
1304 | (u32) ec_ecdt->common.command_addr.address, | |
1305 | (u32) ec_ecdt->common.data_addr.address); | |
45bea155 LY |
1306 | |
1307 | return AE_CTRL_TERMINATE; | |
1308 | } | |
1309 | ||
1310 | static acpi_status __init | |
50526df6 LB |
1311 | acpi_fake_ecdt_burst_callback(acpi_handle handle, |
1312 | u32 Level, void *context, void **retval) | |
45bea155 | 1313 | { |
50526df6 | 1314 | acpi_status status; |
1da177e4 | 1315 | |
45bea155 LY |
1316 | init_MUTEX(&ec_ecdt->burst.sem); |
1317 | init_waitqueue_head(&ec_ecdt->burst.wait); | |
1da177e4 | 1318 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
50526df6 | 1319 | acpi_ec_io_ports, ec_ecdt); |
1da177e4 LT |
1320 | if (ACPI_FAILURE(status)) |
1321 | return status; | |
45bea155 | 1322 | ec_ecdt->common.status_addr = ec_ecdt->common.command_addr; |
1da177e4 | 1323 | |
45bea155 LY |
1324 | ec_ecdt->common.uid = -1; |
1325 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid); | |
1da177e4 | 1326 | |
50526df6 LB |
1327 | status = |
1328 | acpi_evaluate_integer(handle, "_GPE", NULL, | |
1329 | &ec_ecdt->common.gpe_bit); | |
1da177e4 LT |
1330 | if (ACPI_FAILURE(status)) |
1331 | return status; | |
45bea155 LY |
1332 | ec_ecdt->common.global_lock = TRUE; |
1333 | ec_ecdt->common.handle = handle; | |
1da177e4 | 1334 | |
50526df6 LB |
1335 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
1336 | (u32) ec_ecdt->common.gpe_bit, | |
1337 | (u32) ec_ecdt->common.command_addr.address, | |
1338 | (u32) ec_ecdt->common.data_addr.address); | |
1da177e4 LT |
1339 | |
1340 | return AE_CTRL_TERMINATE; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Some BIOS (such as some from Gateway laptops) access EC region very early | |
1345 | * such as in BAT0._INI or EC._INI before an EC device is found and | |
1346 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily | |
1347 | * required, but if EC regison is accessed early, it is required. | |
1348 | * The routine tries to workaround the BIOS bug by pre-scan EC device | |
1349 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any | |
1350 | * op region (since _REG isn't invoked yet). The assumption is true for | |
1351 | * all systems found. | |
1352 | */ | |
50526df6 | 1353 | static int __init acpi_ec_fake_ecdt(void) |
1da177e4 | 1354 | { |
50526df6 LB |
1355 | acpi_status status; |
1356 | int ret = 0; | |
1da177e4 LT |
1357 | |
1358 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); | |
1359 | ||
45bea155 | 1360 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1361 | if (!ec_ecdt) { |
1362 | ret = -ENOMEM; | |
1363 | goto error; | |
1364 | } | |
45bea155 | 1365 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1da177e4 | 1366 | |
50526df6 LB |
1367 | status = acpi_get_devices(ACPI_EC_HID, |
1368 | acpi_fake_ecdt_callback, NULL, NULL); | |
1da177e4 LT |
1369 | if (ACPI_FAILURE(status)) { |
1370 | kfree(ec_ecdt); | |
1371 | ec_ecdt = NULL; | |
1372 | ret = -ENODEV; | |
1373 | goto error; | |
1374 | } | |
1375 | return 0; | |
50526df6 | 1376 | error: |
1da177e4 LT |
1377 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
1378 | return ret; | |
1379 | } | |
1380 | ||
50526df6 | 1381 | static int __init acpi_ec_get_real_ecdt(void) |
45bea155 LY |
1382 | { |
1383 | if (acpi_ec_polling_mode) | |
1384 | return acpi_ec_polling_get_real_ecdt(); | |
1385 | else | |
1386 | return acpi_ec_burst_get_real_ecdt(); | |
1387 | } | |
1388 | ||
50526df6 | 1389 | static int __init acpi_ec_polling_get_real_ecdt(void) |
45bea155 | 1390 | { |
50526df6 LB |
1391 | acpi_status status; |
1392 | struct acpi_table_ecdt *ecdt_ptr; | |
45bea155 | 1393 | |
50526df6 LB |
1394 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
1395 | (struct acpi_table_header **) | |
1396 | &ecdt_ptr); | |
45bea155 LY |
1397 | if (ACPI_FAILURE(status)) |
1398 | return -ENODEV; | |
1399 | ||
1400 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1401 | ||
1402 | /* | |
1403 | * Generate a temporary ec context to use until the namespace is scanned | |
1404 | */ | |
1405 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); | |
1406 | if (!ec_ecdt) | |
1407 | return -ENOMEM; | |
1408 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); | |
1409 | ||
1410 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; | |
1411 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1412 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1413 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1414 | spin_lock_init(&ec_ecdt->polling.lock); | |
1415 | /* use the GL just to be safe */ | |
1416 | ec_ecdt->common.global_lock = TRUE; | |
1417 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1418 | ||
50526df6 LB |
1419 | status = |
1420 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
45bea155 LY |
1421 | if (ACPI_FAILURE(status)) { |
1422 | goto error; | |
1423 | } | |
1424 | ||
1425 | return 0; | |
50526df6 | 1426 | error: |
45bea155 LY |
1427 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1428 | kfree(ec_ecdt); | |
1429 | ec_ecdt = NULL; | |
1430 | ||
1431 | return -ENODEV; | |
1432 | } | |
1433 | ||
50526df6 | 1434 | static int __init acpi_ec_burst_get_real_ecdt(void) |
1da177e4 | 1435 | { |
50526df6 LB |
1436 | acpi_status status; |
1437 | struct acpi_table_ecdt *ecdt_ptr; | |
1da177e4 | 1438 | |
451566f4 | 1439 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
50526df6 LB |
1440 | (struct acpi_table_header **) |
1441 | &ecdt_ptr); | |
1da177e4 LT |
1442 | if (ACPI_FAILURE(status)) |
1443 | return -ENODEV; | |
1444 | ||
1445 | printk(KERN_INFO PREFIX "Found ECDT\n"); | |
1446 | ||
1447 | /* | |
1448 | * Generate a temporary ec context to use until the namespace is scanned | |
1449 | */ | |
45bea155 | 1450 | ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL); |
1da177e4 LT |
1451 | if (!ec_ecdt) |
1452 | return -ENOMEM; | |
45bea155 LY |
1453 | memset(ec_ecdt, 0, sizeof(union acpi_ec)); |
1454 | ||
50526df6 LB |
1455 | init_MUTEX(&ec_ecdt->burst.sem); |
1456 | init_waitqueue_head(&ec_ecdt->burst.wait); | |
45bea155 LY |
1457 | ec_ecdt->common.command_addr = ecdt_ptr->ec_control; |
1458 | ec_ecdt->common.status_addr = ecdt_ptr->ec_control; | |
1459 | ec_ecdt->common.data_addr = ecdt_ptr->ec_data; | |
1460 | ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit; | |
1da177e4 | 1461 | /* use the GL just to be safe */ |
45bea155 LY |
1462 | ec_ecdt->common.global_lock = TRUE; |
1463 | ec_ecdt->common.uid = ecdt_ptr->uid; | |
1da177e4 | 1464 | |
50526df6 LB |
1465 | status = |
1466 | acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle); | |
1da177e4 LT |
1467 | if (ACPI_FAILURE(status)) { |
1468 | goto error; | |
1469 | } | |
1470 | ||
1471 | return 0; | |
50526df6 | 1472 | error: |
1da177e4 LT |
1473 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1474 | kfree(ec_ecdt); | |
1475 | ec_ecdt = NULL; | |
1476 | ||
1477 | return -ENODEV; | |
1478 | } | |
1479 | ||
1480 | static int __initdata acpi_fake_ecdt_enabled; | |
50526df6 | 1481 | int __init acpi_ec_ecdt_probe(void) |
1da177e4 | 1482 | { |
50526df6 LB |
1483 | acpi_status status; |
1484 | int ret; | |
1da177e4 LT |
1485 | |
1486 | ret = acpi_ec_get_real_ecdt(); | |
1487 | /* Try to make a fake ECDT */ | |
1488 | if (ret && acpi_fake_ecdt_enabled) { | |
1489 | ret = acpi_ec_fake_ecdt(); | |
1490 | } | |
1491 | ||
1492 | if (ret) | |
1493 | return 0; | |
1494 | ||
1495 | /* | |
1496 | * Install GPE handler | |
1497 | */ | |
45bea155 | 1498 | status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 LB |
1499 | ACPI_GPE_EDGE_TRIGGERED, |
1500 | &acpi_ec_gpe_handler, ec_ecdt); | |
1da177e4 LT |
1501 | if (ACPI_FAILURE(status)) { |
1502 | goto error; | |
1503 | } | |
50526df6 LB |
1504 | acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
1505 | acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR); | |
1506 | ||
1507 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, | |
1508 | ACPI_ADR_SPACE_EC, | |
1509 | &acpi_ec_space_handler, | |
1510 | &acpi_ec_space_setup, | |
1511 | ec_ecdt); | |
1da177e4 | 1512 | if (ACPI_FAILURE(status)) { |
45bea155 | 1513 | acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, |
50526df6 | 1514 | &acpi_ec_gpe_handler); |
1da177e4 LT |
1515 | goto error; |
1516 | } | |
1517 | ||
1518 | return 0; | |
1519 | ||
50526df6 | 1520 | error: |
1da177e4 LT |
1521 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
1522 | kfree(ec_ecdt); | |
1523 | ec_ecdt = NULL; | |
1524 | ||
1525 | return -ENODEV; | |
1526 | } | |
1527 | ||
50526df6 | 1528 | static int __init acpi_ec_init(void) |
1da177e4 | 1529 | { |
50526df6 | 1530 | int result = 0; |
1da177e4 LT |
1531 | |
1532 | ACPI_FUNCTION_TRACE("acpi_ec_init"); | |
1533 | ||
1534 | if (acpi_disabled) | |
1535 | return_VALUE(0); | |
1536 | ||
1537 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1538 | if (!acpi_ec_dir) | |
1539 | return_VALUE(-ENODEV); | |
1540 | ||
1541 | /* Now register the driver for the EC */ | |
1542 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1543 | if (result < 0) { | |
1544 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1545 | return_VALUE(-ENODEV); | |
1546 | } | |
1547 | ||
1548 | return_VALUE(result); | |
1549 | } | |
1550 | ||
1551 | subsys_initcall(acpi_ec_init); | |
1552 | ||
1553 | /* EC driver currently not unloadable */ | |
1554 | #if 0 | |
50526df6 | 1555 | static void __exit acpi_ec_exit(void) |
1da177e4 LT |
1556 | { |
1557 | ACPI_FUNCTION_TRACE("acpi_ec_exit"); | |
1558 | ||
1559 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1560 | ||
1561 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1562 | ||
1563 | return_VOID; | |
1564 | } | |
50526df6 | 1565 | #endif /* 0 */ |
1da177e4 LT |
1566 | |
1567 | static int __init acpi_fake_ecdt_setup(char *str) | |
1568 | { | |
1569 | acpi_fake_ecdt_enabled = 1; | |
1570 | return 0; | |
1571 | } | |
7b15f5e7 | 1572 | |
1da177e4 | 1573 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |
45bea155 LY |
1574 | static int __init acpi_ec_set_polling_mode(char *str) |
1575 | { | |
7b15f5e7 LY |
1576 | int burst; |
1577 | ||
1578 | if (!get_option(&str, &burst)) | |
1579 | return 0; | |
1580 | ||
1581 | if (burst) { | |
1582 | acpi_ec_polling_mode = EC_BURST; | |
1583 | acpi_ec_driver.ops.add = acpi_ec_burst_add; | |
1584 | } else { | |
1585 | acpi_ec_polling_mode = EC_POLLING; | |
1586 | acpi_ec_driver.ops.add = acpi_ec_polling_add; | |
1587 | } | |
50526df6 | 1588 | printk(KERN_INFO PREFIX "EC %s mode.\n", burst ? "burst" : "polling"); |
45bea155 LY |
1589 | return 0; |
1590 | } | |
50526df6 | 1591 | |
7b15f5e7 | 1592 | __setup("ec_burst=", acpi_ec_set_polling_mode); |