blob: 3758b558d2b5e9ad1b2905049ea090874f63876a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Dmitry Torokhov451566f2005-03-19 01:10:05 -050034#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#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
Len Brown50526df2005-08-11 17:32:05 -040041ACPI_MODULE_NAME("acpi_ec")
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
49#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
Dmitry Torokhov451566f2005-03-19 01:10:05 -050050#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
53#define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
Dmitry Torokhov451566f2005-03-19 01:10:05 -050054#define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
Len Brown50526df2005-08-11 17:32:05 -040056#define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
57#define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define ACPI_EC_COMMAND_READ 0x80
59#define ACPI_EC_COMMAND_WRITE 0x81
Dmitry Torokhov451566f2005-03-19 01:10:05 -050060#define ACPI_EC_BURST_ENABLE 0x82
61#define ACPI_EC_BURST_DISABLE 0x83
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#define ACPI_EC_COMMAND_QUERY 0x84
Luming Yu45bea152005-07-23 04:08:00 -040063#define EC_POLLING 0xFF
64#define EC_BURST 0x00
Len Brown50526df2005-08-11 17:32:05 -040065static int acpi_ec_remove(struct acpi_device *device, int type);
66static int acpi_ec_start(struct acpi_device *device);
67static int acpi_ec_stop(struct acpi_device *device, int type);
68static int acpi_ec_burst_add(struct acpi_device *device);
69static int acpi_ec_polling_add(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71static struct acpi_driver acpi_ec_driver = {
Len Brown50526df2005-08-11 17:32:05 -040072 .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 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
Luming Yu45bea152005-07-23 04:08:00 -040082union acpi_ec {
83 struct {
Len Brown50526df2005-08-11 17:32:05 -040084 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;
Luming Yu45bea152005-07-23 04:08:00 -040092 } common;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Luming Yu45bea152005-07-23 04:08:00 -040094 struct {
Len Brown50526df2005-08-11 17:32:05 -040095 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;
Luming Yu45bea152005-07-23 04:08:00 -0400109
110 struct {
Len Brown50526df2005-08-11 17:32:05 -0400111 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121};
122
Len Brown50526df2005-08-11 17:32:05 -0400123static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event);
Luming Yu45bea152005-07-23 04:08:00 -0400124static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event);
Len Brown50526df2005-08-11 17:32:05 -0400125static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data);
126static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data);
127static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data);
128static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data);
129static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data);
130static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data);
131static void acpi_ec_gpe_polling_query(void *ec_cxt);
132static void acpi_ec_gpe_burst_query(void *ec_cxt);
133static u32 acpi_ec_gpe_polling_handler(void *data);
134static u32 acpi_ec_gpe_burst_handler(void *data);
Luming Yu45bea152005-07-23 04:08:00 -0400135static acpi_status __init
Len Brown50526df2005-08-11 17:32:05 -0400136acpi_fake_ecdt_polling_callback(acpi_handle handle,
137 u32 Level, void *context, void **retval);
Luming Yu45bea152005-07-23 04:08:00 -0400138
139static acpi_status __init
Len Brown50526df2005-08-11 17:32:05 -0400140acpi_fake_ecdt_burst_callback(acpi_handle handle,
141 u32 Level, void *context, void **retval);
Luming Yu45bea152005-07-23 04:08:00 -0400142
Len Brown50526df2005-08-11 17:32:05 -0400143static int __init acpi_ec_polling_get_real_ecdt(void);
144static int __init acpi_ec_burst_get_real_ecdt(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Len Brown50526df2005-08-11 17:32:05 -0400146static union acpi_ec *ec_ecdt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148/* External interfaces use first EC only, so remember */
149static struct acpi_device *first_ec;
Luming Yu7b15f5e2005-08-03 17:38:04 -0400150static int acpi_ec_polling_mode = EC_POLLING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152/* --------------------------------------------------------------------------
153 Transaction Management
154 -------------------------------------------------------------------------- */
155
Arjan van de Ven858119e2006-01-14 13:20:43 -0800156static u32 acpi_ec_read_status(union acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
Len Brown50526df2005-08-11 17:32:05 -0400158 u32 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Luming Yu45bea152005-07-23 04:08:00 -0400160 acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500161 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
Len Brown50526df2005-08-11 17:32:05 -0400164static int acpi_ec_wait(union acpi_ec *ec, u8 event)
Luming Yu45bea152005-07-23 04:08:00 -0400165{
Len Brown50526df2005-08-11 17:32:05 -0400166 if (acpi_ec_polling_mode)
167 return acpi_ec_polling_wait(ec, event);
Luming Yu45bea152005-07-23 04:08:00 -0400168 else
Len Brown50526df2005-08-11 17:32:05 -0400169 return acpi_ec_burst_wait(ec, event);
Luming Yu45bea152005-07-23 04:08:00 -0400170}
171
Len Brown50526df2005-08-11 17:32:05 -0400172static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event)
Luming Yu45bea152005-07-23 04:08:00 -0400173{
Len Brown50526df2005-08-11 17:32:05 -0400174 u32 acpi_ec_status = 0;
175 u32 i = ACPI_EC_UDELAY_COUNT;
Luming Yu45bea152005-07-23 04:08:00 -0400176
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 {
Len Brown50526df2005-08-11 17:32:05 -0400184 acpi_hw_low_level_read(8, &acpi_ec_status,
185 &ec->common.status_addr);
Luming Yu45bea152005-07-23 04:08:00 -0400186 if (acpi_ec_status & ACPI_EC_FLAG_OBF)
187 return 0;
188 udelay(ACPI_EC_UDELAY);
Len Brown50526df2005-08-11 17:32:05 -0400189 } while (--i > 0);
Luming Yu45bea152005-07-23 04:08:00 -0400190 break;
191 case ACPI_EC_EVENT_IBE:
192 do {
Len Brown50526df2005-08-11 17:32:05 -0400193 acpi_hw_low_level_read(8, &acpi_ec_status,
194 &ec->common.status_addr);
Luming Yu45bea152005-07-23 04:08:00 -0400195 if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
196 return 0;
197 udelay(ACPI_EC_UDELAY);
Len Brown50526df2005-08-11 17:32:05 -0400198 } while (--i > 0);
Luming Yu45bea152005-07-23 04:08:00 -0400199 break;
200 default:
201 return -EINVAL;
202 }
203
204 return -ETIME;
205}
206static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event)
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500207{
Len Brown50526df2005-08-11 17:32:05 -0400208 int result = 0;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500209
210 ACPI_FUNCTION_TRACE("acpi_ec_wait");
211
Luming Yu45bea152005-07-23 04:08:00 -0400212 ec->burst.expect_event = event;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500213 smp_mb();
214
Luming Yu716e0842005-08-10 01:40:00 -0400215 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,
Len Brown50526df2005-08-11 17:32:05 -0400232 !ec->burst.expect_event,
233 msecs_to_jiffies(ACPI_EC_DELAY));
234
Luming Yu45bea152005-07-23 04:08:00 -0400235 ec->burst.expect_event = 0;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500236 smp_mb();
237
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500238 /*
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 */
243 switch (event) {
244 case ACPI_EC_EVENT_OBF:
245 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
246 return_VALUE(0);
247 break;
248
249 case ACPI_EC_EVENT_IBE:
250 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
251 return_VALUE(0);
252 break;
253 }
254
255 return_VALUE(-ETIME);
256}
257
Len Brown50526df2005-08-11 17:32:05 -0400258static int acpi_ec_enter_burst_mode(union acpi_ec *ec)
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500259{
Len Brown50526df2005-08-11 17:32:05 -0400260 u32 tmp = 0;
261 int status = 0;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500262
263 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
264
265 status = acpi_ec_read_status(ec);
Len Brown50526df2005-08-11 17:32:05 -0400266 if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
Luming Yu716e0842005-08-10 01:40:00 -0400267 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
Len Brown50526df2005-08-11 17:32:05 -0400268 if (status)
Luming Yu716e0842005-08-10 01:40:00 -0400269 goto end;
Len Brown50526df2005-08-11 17:32:05 -0400270 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
271 &ec->common.command_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500272 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
Luming Yu716e0842005-08-10 01:40:00 -0400273 if (status)
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500274 return_VALUE(-EINVAL);
Luming Yu45bea152005-07-23 04:08:00 -0400275 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
Len Brown50526df2005-08-11 17:32:05 -0400276 if (tmp != 0x90) { /* Burst ACK byte */
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500277 return_VALUE(-EINVAL);
278 }
Luming Yu668d74c2005-07-23 00:26:33 -0400279 }
280
Len Brown50526df2005-08-11 17:32:05 -0400281 atomic_set(&ec->burst.leaving_burst, 0);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500282 return_VALUE(0);
Len Brown50526df2005-08-11 17:32:05 -0400283 end:
Luming Yu716e0842005-08-10 01:40:00 -0400284 printk("Error in acpi_ec_wait\n");
285 return_VALUE(-1);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500286}
287
Len Brown50526df2005-08-11 17:32:05 -0400288static int acpi_ec_leave_burst_mode(union acpi_ec *ec)
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500289{
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500290
291 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
292
Luming Yu716e0842005-08-10 01:40:00 -0400293 atomic_set(&ec->burst.leaving_burst, 1);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500294 return_VALUE(0);
295}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Len Brown50526df2005-08-11 17:32:05 -0400297static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
Luming Yu45bea152005-07-23 04:08:00 -0400298{
Len Brown50526df2005-08-11 17:32:05 -0400299 if (acpi_ec_polling_mode)
Luming Yu45bea152005-07-23 04:08:00 -0400300 return acpi_ec_polling_read(ec, address, data);
301 else
302 return acpi_ec_burst_read(ec, address, data);
303}
Len Brown50526df2005-08-11 17:32:05 -0400304static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
Luming Yu45bea152005-07-23 04:08:00 -0400305{
Len Brown50526df2005-08-11 17:32:05 -0400306 if (acpi_ec_polling_mode)
Luming Yu45bea152005-07-23 04:08:00 -0400307 return acpi_ec_polling_write(ec, address, data);
308 else
309 return acpi_ec_burst_write(ec, address, data);
310}
Len Brown50526df2005-08-11 17:32:05 -0400311static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data)
Luming Yu45bea152005-07-23 04:08:00 -0400312{
Len Brown50526df2005-08-11 17:32:05 -0400313 acpi_status status = AE_OK;
314 int result = 0;
315 unsigned long flags = 0;
316 u32 glk = 0;
Luming Yu45bea152005-07-23 04:08:00 -0400317
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
Len Brown50526df2005-08-11 17:32:05 -0400333 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
334 &ec->common.command_addr);
Luming Yu45bea152005-07-23 04:08:00 -0400335 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",
Len Brown50526df2005-08-11 17:32:05 -0400347 *data, address));
348
349 end:
Luming Yu45bea152005-07-23 04:08:00 -0400350 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
Len Brown50526df2005-08-11 17:32:05 -0400358static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data)
Luming Yu45bea152005-07-23 04:08:00 -0400359{
Len Brown50526df2005-08-11 17:32:05 -0400360 int result = 0;
361 acpi_status status = AE_OK;
362 unsigned long flags = 0;
363 u32 glk = 0;
Luming Yu45bea152005-07-23 04:08:00 -0400364
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
Len Brown50526df2005-08-11 17:32:05 -0400378 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
379 &ec->common.command_addr);
Luming Yu45bea152005-07-23 04:08:00 -0400380 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",
Len Brown50526df2005-08-11 17:32:05 -0400395 data, address));
Luming Yu45bea152005-07-23 04:08:00 -0400396
Len Brown50526df2005-08-11 17:32:05 -0400397 end:
Luming Yu45bea152005-07-23 04:08:00 -0400398 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
Len Brown50526df2005-08-11 17:32:05 -0400406static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407{
Len Brown50526df2005-08-11 17:32:05 -0400408 int status = 0;
409 u32 glk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 ACPI_FUNCTION_TRACE("acpi_ec_read");
412
413 if (!ec || !data)
414 return_VALUE(-EINVAL);
415
416 *data = 0;
417
Luming Yu45bea152005-07-23 04:08:00 -0400418 if (ec->common.global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
420 if (ACPI_FAILURE(status))
421 return_VALUE(-ENODEV);
422 }
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500423
424 WARN_ON(in_interrupt());
Luming Yu45bea152005-07-23 04:08:00 -0400425 down(&ec->burst.sem);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500426
Luming Yu716e0842005-08-10 01:40:00 -0400427 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");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500431 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400432 }
Len Brown50526df2005-08-11 17:32:05 -0400433 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
434 &ec->common.command_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500435 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500436 if (status) {
Luming Yu716e0842005-08-10 01:40:00 -0400437 printk("read EC, IB not empty\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Luming Yu45bea152005-07-23 04:08:00 -0400440 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
Len Brown50526df2005-08-11 17:32:05 -0400441 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
442 if (status) {
Luming Yu716e0842005-08-10 01:40:00 -0400443 printk("read EC, OB not full\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 goto end;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500445 }
Luming Yu45bea152005-07-23 04:08:00 -0400446 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
Len Brown50526df2005-08-11 17:32:05 -0400448 *data, address));
449
450 end:
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500451 acpi_ec_leave_burst_mode(ec);
Luming Yu45bea152005-07-23 04:08:00 -0400452 up(&ec->burst.sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Luming Yu45bea152005-07-23 04:08:00 -0400454 if (ec->common.global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 acpi_release_global_lock(glk);
456
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500457 return_VALUE(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
Len Brown50526df2005-08-11 17:32:05 -0400460static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
Len Brown50526df2005-08-11 17:32:05 -0400462 int status = 0;
463 u32 glk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465 ACPI_FUNCTION_TRACE("acpi_ec_write");
466
467 if (!ec)
468 return_VALUE(-EINVAL);
Luming Yu716e0842005-08-10 01:40:00 -0400469
Luming Yu45bea152005-07-23 04:08:00 -0400470 if (ec->common.global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
472 if (ACPI_FAILURE(status))
473 return_VALUE(-ENODEV);
474 }
475
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500476 WARN_ON(in_interrupt());
Luming Yu45bea152005-07-23 04:08:00 -0400477 down(&ec->burst.sem);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500478
Luming Yu716e0842005-08-10 01:40:00 -0400479 acpi_ec_enter_burst_mode(ec);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500480
Luming Yu716e0842005-08-10 01:40:00 -0400481 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
Len Brown50526df2005-08-11 17:32:05 -0400482 if (status) {
Luming Yu716e0842005-08-10 01:40:00 -0400483 printk("write EC, IB not empty\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500484 }
Len Brown50526df2005-08-11 17:32:05 -0400485 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
486 &ec->common.command_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500487 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
Luming Yu716e0842005-08-10 01:40:00 -0400488 if (status) {
Len Brown50526df2005-08-11 17:32:05 -0400489 printk("write EC, IB not empty\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Luming Yu45bea152005-07-23 04:08:00 -0400492 acpi_hw_low_level_write(8, address, &ec->common.data_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500493 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
Len Brown50526df2005-08-11 17:32:05 -0400494 if (status) {
Luming Yu716e0842005-08-10 01:40:00 -0400495 printk("write EC, IB not empty\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Luming Yu45bea152005-07-23 04:08:00 -0400498 acpi_hw_low_level_write(8, data, &ec->common.data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
Len Brown50526df2005-08-11 17:32:05 -0400501 data, address));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500503 acpi_ec_leave_burst_mode(ec);
Luming Yu45bea152005-07-23 04:08:00 -0400504 up(&ec->burst.sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Luming Yu45bea152005-07-23 04:08:00 -0400506 if (ec->common.global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 acpi_release_global_lock(glk);
508
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500509 return_VALUE(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
511
512/*
513 * Externally callable EC access functions. For now, assume 1 EC only
514 */
Len Brown50526df2005-08-11 17:32:05 -0400515int ec_read(u8 addr, u8 * val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
Luming Yu45bea152005-07-23 04:08:00 -0400517 union acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 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;
Len Brown50526df2005-08-11 17:32:05 -0400531 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 return err;
533}
Len Brown50526df2005-08-11 17:32:05 -0400534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535EXPORT_SYMBOL(ec_read);
536
Len Brown50526df2005-08-11 17:32:05 -0400537int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Luming Yu45bea152005-07-23 04:08:00 -0400539 union acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 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}
Len Brown50526df2005-08-11 17:32:05 -0400551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552EXPORT_SYMBOL(ec_write);
553
Len Brown50526df2005-08-11 17:32:05 -0400554static int acpi_ec_query(union acpi_ec *ec, u32 * data)
Luming Yu45bea152005-07-23 04:08:00 -0400555{
Len Brown50526df2005-08-11 17:32:05 -0400556 if (acpi_ec_polling_mode)
Luming Yu45bea152005-07-23 04:08:00 -0400557 return acpi_ec_polling_query(ec, data);
558 else
559 return acpi_ec_burst_query(ec, data);
560}
Len Brown50526df2005-08-11 17:32:05 -0400561static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data)
Luming Yu45bea152005-07-23 04:08:00 -0400562{
Len Brown50526df2005-08-11 17:32:05 -0400563 int result = 0;
564 acpi_status status = AE_OK;
565 unsigned long flags = 0;
566 u32 glk = 0;
Luming Yu45bea152005-07-23 04:08:00 -0400567
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
Len Brown50526df2005-08-11 17:32:05 -0400588 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
589 &ec->common.command_addr);
Luming Yu45bea152005-07-23 04:08:00 -0400590 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
Len Brown50526df2005-08-11 17:32:05 -0400598 end:
Luming Yu45bea152005-07-23 04:08:00 -0400599 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}
Len Brown50526df2005-08-11 17:32:05 -0400606static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
Len Brown50526df2005-08-11 17:32:05 -0400608 int status = 0;
609 u32 glk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 ACPI_FUNCTION_TRACE("acpi_ec_query");
612
613 if (!ec || !data)
614 return_VALUE(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 *data = 0;
616
Luming Yu45bea152005-07-23 04:08:00 -0400617 if (ec->common.global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
619 if (ACPI_FAILURE(status))
620 return_VALUE(-ENODEV);
621 }
622
Luming Yu45bea152005-07-23 04:08:00 -0400623 down(&ec->burst.sem);
Luming Yu716e0842005-08-10 01:40:00 -0400624
625 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
626 if (status) {
627 printk("query EC, IB not empty\n");
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500628 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 /*
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 */
Len Brown50526df2005-08-11 17:32:05 -0400635 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
636 &ec->common.command_addr);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500637 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
Len Brown50526df2005-08-11 17:32:05 -0400638 if (status) {
Luming Yu716e0842005-08-10 01:40:00 -0400639 printk("query EC, OB not full\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 goto end;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500641 }
642
Luming Yu45bea152005-07-23 04:08:00 -0400643 acpi_hw_low_level_read(8, data, &ec->common.data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 if (!*data)
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500645 status = -ENODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Len Brown50526df2005-08-11 17:32:05 -0400647 end:
Luming Yu45bea152005-07-23 04:08:00 -0400648 up(&ec->burst.sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Luming Yu45bea152005-07-23 04:08:00 -0400650 if (ec->common.global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 acpi_release_global_lock(glk);
652
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500653 return_VALUE(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656/* --------------------------------------------------------------------------
657 Event Management
658 -------------------------------------------------------------------------- */
659
Luming Yu45bea152005-07-23 04:08:00 -0400660union acpi_ec_query_data {
Len Brown50526df2005-08-11 17:32:05 -0400661 acpi_handle handle;
662 u8 data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663};
664
Len Brown50526df2005-08-11 17:32:05 -0400665static void acpi_ec_gpe_query(void *ec_cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
Len Brown50526df2005-08-11 17:32:05 -0400667 if (acpi_ec_polling_mode)
Luming Yu45bea152005-07-23 04:08:00 -0400668 acpi_ec_gpe_polling_query(ec_cxt);
669 else
670 acpi_ec_gpe_burst_query(ec_cxt);
671}
672
Len Brown50526df2005-08-11 17:32:05 -0400673static void acpi_ec_gpe_polling_query(void *ec_cxt)
Luming Yu45bea152005-07-23 04:08:00 -0400674{
Len Brown50526df2005-08-11 17:32:05 -0400675 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 };
Luming Yu45bea152005-07-23 04:08:00 -0400682
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
Len Brown50526df2005-08-11 17:32:05 -0400711 end:
Luming Yu45bea152005-07-23 04:08:00 -0400712 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
713}
Len Brown50526df2005-08-11 17:32:05 -0400714static void acpi_ec_gpe_burst_query(void *ec_cxt)
Luming Yu45bea152005-07-23 04:08:00 -0400715{
Len Brown50526df2005-08-11 17:32:05 -0400716 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 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
725
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500726 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
727 result = acpi_ec_query(ec, &value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500729 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 goto end;
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 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
Luming Yu45bea152005-07-23 04:08:00 -0400737 acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
Len Brown50526df2005-08-11 17:32:05 -0400738 end:
Luming Yu45bea152005-07-23 04:08:00 -0400739 atomic_dec(&ec->burst.pending_gpe);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500740 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741}
742
Len Brown50526df2005-08-11 17:32:05 -0400743static u32 acpi_ec_gpe_handler(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
Len Brown50526df2005-08-11 17:32:05 -0400745 if (acpi_ec_polling_mode)
Luming Yu45bea152005-07-23 04:08:00 -0400746 return acpi_ec_gpe_polling_handler(data);
747 else
Len Brown50526df2005-08-11 17:32:05 -0400748 return acpi_ec_gpe_burst_handler(data);
Luming Yu45bea152005-07-23 04:08:00 -0400749}
Len Brown50526df2005-08-11 17:32:05 -0400750static u32 acpi_ec_gpe_polling_handler(void *data)
Luming Yu45bea152005-07-23 04:08:00 -0400751{
Len Brown50526df2005-08-11 17:32:05 -0400752 acpi_status status = AE_OK;
753 union acpi_ec *ec = (union acpi_ec *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755 if (!ec)
756 return ACPI_INTERRUPT_NOT_HANDLED;
757
Luming Yu45bea152005-07-23 04:08:00 -0400758 acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
759
760 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
Len Brown50526df2005-08-11 17:32:05 -0400761 acpi_ec_gpe_query, ec);
Luming Yu45bea152005-07-23 04:08:00 -0400762
763 if (status == AE_OK)
764 return ACPI_INTERRUPT_HANDLED;
765 else
766 return ACPI_INTERRUPT_NOT_HANDLED;
767}
Len Brown50526df2005-08-11 17:32:05 -0400768static u32 acpi_ec_gpe_burst_handler(void *data)
Luming Yu45bea152005-07-23 04:08:00 -0400769{
Len Brown50526df2005-08-11 17:32:05 -0400770 acpi_status status = AE_OK;
771 u32 value;
772 union acpi_ec *ec = (union acpi_ec *)data;
Luming Yu45bea152005-07-23 04:08:00 -0400773
774 if (!ec)
775 return ACPI_INTERRUPT_NOT_HANDLED;
776
Luming Yu716e0842005-08-10 01:40:00 -0400777 acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500778 value = acpi_ec_read_status(ec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
Len Brown50526df2005-08-11 17:32:05 -0400780 switch (ec->burst.expect_event) {
Luming Yu716e0842005-08-10 01:40:00 -0400781 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;
Luming Yu45bea152005-07-23 04:08:00 -0400788 wake_up(&ec->burst.wait);
Luming Yu716e0842005-08-10 01:40:00 -0400789 return ACPI_INTERRUPT_HANDLED;
790 default:
791 break;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500792 }
793
Len Brown50526df2005-08-11 17:32:05 -0400794 if (value & ACPI_EC_FLAG_SCI) {
795 atomic_add(1, &ec->burst.pending_gpe);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500796 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
Len Brown50526df2005-08-11 17:32:05 -0400797 acpi_ec_gpe_query, ec);
Luming Yu17e9c782005-04-22 23:07:10 -0400798 return status == AE_OK ?
Len Brown50526df2005-08-11 17:32:05 -0400799 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
800 }
Luming Yu45bea152005-07-23 04:08:00 -0400801 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500802 return status == AE_OK ?
Len Brown50526df2005-08-11 17:32:05 -0400803 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804}
805
806/* --------------------------------------------------------------------------
807 Address Space Management
808 -------------------------------------------------------------------------- */
809
810static acpi_status
Len Brown50526df2005-08-11 17:32:05 -0400811acpi_ec_space_setup(acpi_handle region_handle,
812 u32 function, void *handler_context, void **return_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
814 /*
815 * The EC object is in the handler context and is needed
816 * when calling the acpi_ec_space_handler.
817 */
Len Brown50526df2005-08-11 17:32:05 -0400818 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
819 handler_context : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
821 return AE_OK;
822}
823
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824static acpi_status
Len Brown50526df2005-08-11 17:32:05 -0400825acpi_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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
Len Brown50526df2005-08-11 17:32:05 -0400831 int result = 0;
832 union acpi_ec *ec = NULL;
833 u64 temp = *value;
834 acpi_integer f_v = 0;
835 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
837 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
838
839 if ((address > 0xFF) || !value || !handler_context)
840 return_VALUE(AE_BAD_PARAMETER);
841
Luming Yufa9cd542005-03-19 01:54:47 -0500842 if (bit_width != 8 && acpi_strict) {
Len Brown50526df2005-08-11 17:32:05 -0400843 printk(KERN_WARNING PREFIX
844 "acpi_ec_space_handler: bit_width should be 8\n");
Luming Yufa9cd542005-03-19 01:54:47 -0500845 return_VALUE(AE_BAD_PARAMETER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 }
847
Len Brown50526df2005-08-11 17:32:05 -0400848 ec = (union acpi_ec *)handler_context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Len Brown50526df2005-08-11 17:32:05 -0400850 next_byte:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 switch (function) {
852 case ACPI_READ:
Luming Yufa9cd542005-03-19 01:54:47 -0500853 temp = 0;
Len Brown50526df2005-08-11 17:32:05 -0400854 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 break;
856 case ACPI_WRITE:
Luming Yufa9cd542005-03-19 01:54:47 -0500857 result = acpi_ec_write(ec, (u8) address, (u8) temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 break;
859 default:
860 result = -EINVAL;
861 goto out;
862 break;
863 }
864
865 bit_width -= 8;
Luming Yufa9cd542005-03-19 01:54:47 -0500866 if (bit_width) {
867 if (function == ACPI_READ)
868 f_v |= temp << 8 * i;
869 if (function == ACPI_WRITE)
870 temp >>= 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 i++;
Andrew Morton83ea7442005-03-30 22:12:13 -0500872 address++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 goto next_byte;
874 }
875
Luming Yufa9cd542005-03-19 01:54:47 -0500876 if (function == ACPI_READ) {
877 f_v |= temp << 8 * i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 *value = f_v;
879 }
880
Len Brown50526df2005-08-11 17:32:05 -0400881 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897/* --------------------------------------------------------------------------
898 FS Interface (/proc)
899 -------------------------------------------------------------------------- */
900
Len Brown50526df2005-08-11 17:32:05 -0400901static struct proc_dir_entry *acpi_ec_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Len Brown50526df2005-08-11 17:32:05 -0400903static int acpi_ec_read_info(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904{
Len Brown50526df2005-08-11 17:32:05 -0400905 union acpi_ec *ec = (union acpi_ec *)seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
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",
Len Brown50526df2005-08-11 17:32:05 -0400913 (u32) ec->common.gpe_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
Len Brown50526df2005-08-11 17:32:05 -0400915 (u32) ec->common.status_addr.address,
916 (u32) ec->common.data_addr.address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 seq_printf(seq, "use global lock: %s\n",
Len Brown50526df2005-08-11 17:32:05 -0400918 ec->common.global_lock ? "yes" : "no");
Luming Yu45bea152005-07-23 04:08:00 -0400919 acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Len Brown50526df2005-08-11 17:32:05 -0400921 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 return_VALUE(0);
923}
924
925static 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
930static struct file_operations acpi_ec_info_ops = {
Len Brown50526df2005-08-11 17:32:05 -0400931 .open = acpi_ec_info_open_fs,
932 .read = seq_read,
933 .llseek = seq_lseek,
934 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 .owner = THIS_MODULE,
936};
937
Len Brown50526df2005-08-11 17:32:05 -0400938static int acpi_ec_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
Len Brown50526df2005-08-11 17:32:05 -0400940 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
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),
Len Brown50526df2005-08-11 17:32:05 -0400946 acpi_ec_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 if (!acpi_device_dir(device))
948 return_VALUE(-ENODEV);
949 }
950
951 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
Len Brown50526df2005-08-11 17:32:05 -0400952 acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 if (!entry)
954 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
Len Brown50526df2005-08-11 17:32:05 -0400955 "Unable to create '%s' fs entry\n",
956 ACPI_EC_FILE_INFO));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 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
Len Brown50526df2005-08-11 17:32:05 -0400966static int acpi_ec_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979/* --------------------------------------------------------------------------
980 Driver Interface
981 -------------------------------------------------------------------------- */
982
Len Brown50526df2005-08-11 17:32:05 -0400983static int acpi_ec_polling_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984{
Len Brown50526df2005-08-11 17:32:05 -0400985 int result = 0;
986 acpi_status status = AE_OK;
987 union acpi_ec *ec = NULL;
988 unsigned long uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990 ACPI_FUNCTION_TRACE("acpi_ec_add");
991
992 if (!device)
993 return_VALUE(-EINVAL);
994
Luming Yu45bea152005-07-23 04:08:00 -0400995 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 if (!ec)
997 return_VALUE(-ENOMEM);
Luming Yu45bea152005-07-23 04:08:00 -0400998 memset(ec, 0, sizeof(union acpi_ec));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
Luming Yu45bea152005-07-23 04:08:00 -04001000 ec->common.handle = device->handle;
1001 ec->common.uid = -1;
1002 spin_lock_init(&ec->polling.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 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? */
Len Brown50526df2005-08-11 17:32:05 -04001008 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1009 &ec->common.global_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
1011 /* If our UID matches the UID for the ECDT-enumerated EC,
Len Brown50526df2005-08-11 17:32:05 -04001012 we now have the *real* EC info, so kill the makeshift one. */
Luming Yu45bea152005-07-23 04:08:00 -04001013 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1014 if (ec_ecdt && ec_ecdt->common.uid == uid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
Len Brown50526df2005-08-11 17:32:05 -04001016 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
1022 kfree(ec_ecdt);
1023 }
1024
1025 /* Get GPE bit assignment (EC events). */
1026 /* TODO: Add support for _GPE returning a package */
Len Brown50526df2005-08-11 17:32:05 -04001027 status =
1028 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1029 &ec->common.gpe_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 if (ACPI_FAILURE(status)) {
1031 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown50526df2005-08-11 17:32:05 -04001032 "Error obtaining GPE bit assignment\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 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",
Len Brown50526df2005-08-11 17:32:05 -04001042 acpi_device_name(device), acpi_device_bid(device),
1043 (u32) ec->common.gpe_bit);
Luming Yu45bea152005-07-23 04:08:00 -04001044
1045 if (!first_ec)
1046 first_ec = device;
1047
Len Brown50526df2005-08-11 17:32:05 -04001048 end:
Luming Yu45bea152005-07-23 04:08:00 -04001049 if (result)
1050 kfree(ec);
1051
1052 return_VALUE(result);
1053}
Len Brown50526df2005-08-11 17:32:05 -04001054static int acpi_ec_burst_add(struct acpi_device *device)
Luming Yu45bea152005-07-23 04:08:00 -04001055{
Len Brown50526df2005-08-11 17:32:05 -04001056 int result = 0;
1057 acpi_status status = AE_OK;
1058 union acpi_ec *ec = NULL;
1059 unsigned long uid;
Luming Yu45bea152005-07-23 04:08:00 -04001060
1061 ACPI_FUNCTION_TRACE("acpi_ec_add");
1062
1063 if (!device)
1064 return_VALUE(-EINVAL);
1065
1066 ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1067 if (!ec)
1068 return_VALUE(-ENOMEM);
1069 memset(ec, 0, sizeof(union acpi_ec));
1070
1071 ec->common.handle = device->handle;
1072 ec->common.uid = -1;
Len Brown50526df2005-08-11 17:32:05 -04001073 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);
Luming Yu45bea152005-07-23 04:08:00 -04001077 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? */
Len Brown50526df2005-08-11 17:32:05 -04001082 acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1083 &ec->common.global_lock);
Luming Yu45bea152005-07-23 04:08:00 -04001084
1085 /* If our UID matches the UID for the ECDT-enumerated EC,
Len Brown50526df2005-08-11 17:32:05 -04001086 we now have the *real* EC info, so kill the makeshift one. */
Luming Yu45bea152005-07-23 04:08:00 -04001087 acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1088 if (ec_ecdt && ec_ecdt->common.uid == uid) {
1089 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
Len Brown50526df2005-08-11 17:32:05 -04001090 ACPI_ADR_SPACE_EC,
1091 &acpi_ec_space_handler);
Luming Yu45bea152005-07-23 04:08:00 -04001092
Len Brown50526df2005-08-11 17:32:05 -04001093 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1094 &acpi_ec_gpe_handler);
Luming Yu45bea152005-07-23 04:08:00 -04001095
1096 kfree(ec_ecdt);
1097 }
1098
1099 /* Get GPE bit assignment (EC events). */
1100 /* TODO: Add support for _GPE returning a package */
Len Brown50526df2005-08-11 17:32:05 -04001101 status =
1102 acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1103 &ec->common.gpe_bit);
Luming Yu45bea152005-07-23 04:08:00 -04001104 if (ACPI_FAILURE(status)) {
1105 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown50526df2005-08-11 17:32:05 -04001106 "Error obtaining GPE bit assignment\n"));
Luming Yu45bea152005-07-23 04:08:00 -04001107 result = -ENODEV;
1108 goto end;
1109 }
1110
1111 result = acpi_ec_add_fs(device);
1112 if (result)
1113 goto end;
1114
Luming Yu716e0842005-08-10 01:40:00 -04001115 printk("burst-mode-ec-10-Aug\n");
Luming Yu45bea152005-07-23 04:08:00 -04001116 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
Len Brown50526df2005-08-11 17:32:05 -04001117 acpi_device_name(device), acpi_device_bid(device),
1118 (u32) ec->common.gpe_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
1120 if (!first_ec)
1121 first_ec = device;
1122
Len Brown50526df2005-08-11 17:32:05 -04001123 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (result)
1125 kfree(ec);
1126
1127 return_VALUE(result);
1128}
1129
Len Brown50526df2005-08-11 17:32:05 -04001130static int acpi_ec_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131{
Len Brown50526df2005-08-11 17:32:05 -04001132 union acpi_ec *ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148static acpi_status
Len Brown50526df2005-08-11 17:32:05 -04001149acpi_ec_io_ports(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150{
Len Brown50526df2005-08-11 17:32:05 -04001151 union acpi_ec *ec = (union acpi_ec *)context;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 struct acpi_generic_address *addr;
1153
1154 if (resource->id != ACPI_RSTYPE_IO) {
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 */
Luming Yu45bea152005-07-23 04:08:00 -04001163 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 } 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;
1174 addr->address = resource->data.io.min_base_address;
1175
1176 return AE_OK;
1177}
1178
Len Brown50526df2005-08-11 17:32:05 -04001179static int acpi_ec_start(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180{
Len Brown50526df2005-08-11 17:32:05 -04001181 acpi_status status = AE_OK;
1182 union acpi_ec *ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
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 */
Luming Yu45bea152005-07-23 04:08:00 -04001197 status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
Len Brown50526df2005-08-11 17:32:05 -04001198 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"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 return_VALUE(-ENODEV);
1204 }
1205
Luming Yu45bea152005-07-23 04:08:00 -04001206 ec->common.status_addr = ec->common.command_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
Len Brown50526df2005-08-11 17:32:05 -04001209 (u32) ec->common.gpe_bit,
1210 (u32) ec->common.command_addr.address,
1211 (u32) ec->common.data_addr.address));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
1213 /*
1214 * Install GPE handler
1215 */
Luming Yu45bea152005-07-23 04:08:00 -04001216 status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
Len Brown50526df2005-08-11 17:32:05 -04001217 ACPI_GPE_EDGE_TRIGGERED,
1218 &acpi_ec_gpe_handler, ec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 if (ACPI_FAILURE(status)) {
1220 return_VALUE(-ENODEV);
1221 }
Len Brown50526df2005-08-11 17:32:05 -04001222 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Len Brown50526df2005-08-11 17:32:05 -04001225 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (ACPI_FAILURE(status)) {
Len Brown50526df2005-08-11 17:32:05 -04001230 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1231 &acpi_ec_gpe_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 return_VALUE(-ENODEV);
1233 }
1234
1235 return_VALUE(AE_OK);
1236}
1237
Len Brown50526df2005-08-11 17:32:05 -04001238static int acpi_ec_stop(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
Len Brown50526df2005-08-11 17:32:05 -04001240 acpi_status status = AE_OK;
1241 union acpi_ec *ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
1243 ACPI_FUNCTION_TRACE("acpi_ec_stop");
1244
1245 if (!device)
1246 return_VALUE(-EINVAL);
1247
1248 ec = acpi_driver_data(device);
1249
Luming Yu45bea152005-07-23 04:08:00 -04001250 status = acpi_remove_address_space_handler(ec->common.handle,
Len Brown50526df2005-08-11 17:32:05 -04001251 ACPI_ADR_SPACE_EC,
1252 &acpi_ec_space_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (ACPI_FAILURE(status))
1254 return_VALUE(-ENODEV);
1255
Len Brown50526df2005-08-11 17:32:05 -04001256 status =
1257 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1258 &acpi_ec_gpe_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 if (ACPI_FAILURE(status))
1260 return_VALUE(-ENODEV);
1261
1262 return_VALUE(0);
1263}
1264
1265static acpi_status __init
Len Brown50526df2005-08-11 17:32:05 -04001266acpi_fake_ecdt_callback(acpi_handle handle,
1267 u32 Level, void *context, void **retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268{
Luming Yu45bea152005-07-23 04:08:00 -04001269
1270 if (acpi_ec_polling_mode)
1271 return acpi_fake_ecdt_polling_callback(handle,
Len Brown50526df2005-08-11 17:32:05 -04001272 Level, context, retval);
Luming Yu45bea152005-07-23 04:08:00 -04001273 else
1274 return acpi_fake_ecdt_burst_callback(handle,
Len Brown50526df2005-08-11 17:32:05 -04001275 Level, context, retval);
Luming Yu45bea152005-07-23 04:08:00 -04001276}
1277
1278static acpi_status __init
Len Brown50526df2005-08-11 17:32:05 -04001279acpi_fake_ecdt_polling_callback(acpi_handle handle,
1280 u32 Level, void *context, void **retval)
Luming Yu45bea152005-07-23 04:08:00 -04001281{
Len Brown50526df2005-08-11 17:32:05 -04001282 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
1284 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
Len Brown50526df2005-08-11 17:32:05 -04001285 acpi_ec_io_ports, ec_ecdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 if (ACPI_FAILURE(status))
1287 return status;
Luming Yu45bea152005-07-23 04:08:00 -04001288 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
Luming Yu45bea152005-07-23 04:08:00 -04001290 ec_ecdt->common.uid = -1;
1291 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Len Brown50526df2005-08-11 17:32:05 -04001293 status =
1294 acpi_evaluate_integer(handle, "_GPE", NULL,
1295 &ec_ecdt->common.gpe_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 if (ACPI_FAILURE(status))
1297 return status;
Luming Yu45bea152005-07-23 04:08:00 -04001298 spin_lock_init(&ec_ecdt->polling.lock);
1299 ec_ecdt->common.global_lock = TRUE;
1300 ec_ecdt->common.handle = handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Len Brown50526df2005-08-11 17:32:05 -04001302 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);
Luming Yu45bea152005-07-23 04:08:00 -04001306
1307 return AE_CTRL_TERMINATE;
1308}
1309
1310static acpi_status __init
Len Brown50526df2005-08-11 17:32:05 -04001311acpi_fake_ecdt_burst_callback(acpi_handle handle,
1312 u32 Level, void *context, void **retval)
Luming Yu45bea152005-07-23 04:08:00 -04001313{
Len Brown50526df2005-08-11 17:32:05 -04001314 acpi_status status;
Luming Yu45bea152005-07-23 04:08:00 -04001315
1316 init_MUTEX(&ec_ecdt->burst.sem);
1317 init_waitqueue_head(&ec_ecdt->burst.wait);
1318 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
Len Brown50526df2005-08-11 17:32:05 -04001319 acpi_ec_io_ports, ec_ecdt);
Luming Yu45bea152005-07-23 04:08:00 -04001320 if (ACPI_FAILURE(status))
1321 return status;
1322 ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1323
1324 ec_ecdt->common.uid = -1;
1325 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1326
Len Brown50526df2005-08-11 17:32:05 -04001327 status =
1328 acpi_evaluate_integer(handle, "_GPE", NULL,
1329 &ec_ecdt->common.gpe_bit);
Luming Yu45bea152005-07-23 04:08:00 -04001330 if (ACPI_FAILURE(status))
1331 return status;
1332 ec_ecdt->common.global_lock = TRUE;
1333 ec_ecdt->common.handle = handle;
1334
Len Brown50526df2005-08-11 17:32:05 -04001335 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
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 */
Len Brown50526df2005-08-11 17:32:05 -04001353static int __init acpi_ec_fake_ecdt(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
Len Brown50526df2005-08-11 17:32:05 -04001355 acpi_status status;
1356 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
1358 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1359
Luming Yu45bea152005-07-23 04:08:00 -04001360 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 if (!ec_ecdt) {
1362 ret = -ENOMEM;
1363 goto error;
1364 }
Luming Yu45bea152005-07-23 04:08:00 -04001365 memset(ec_ecdt, 0, sizeof(union acpi_ec));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Len Brown50526df2005-08-11 17:32:05 -04001367 status = acpi_get_devices(ACPI_EC_HID,
1368 acpi_fake_ecdt_callback, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (ACPI_FAILURE(status)) {
1370 kfree(ec_ecdt);
1371 ec_ecdt = NULL;
1372 ret = -ENODEV;
1373 goto error;
1374 }
1375 return 0;
Len Brown50526df2005-08-11 17:32:05 -04001376 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1378 return ret;
1379}
1380
Len Brown50526df2005-08-11 17:32:05 -04001381static int __init acpi_ec_get_real_ecdt(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382{
Luming Yu45bea152005-07-23 04:08:00 -04001383 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
Len Brown50526df2005-08-11 17:32:05 -04001389static int __init acpi_ec_polling_get_real_ecdt(void)
Luming Yu45bea152005-07-23 04:08:00 -04001390{
Len Brown50526df2005-08-11 17:32:05 -04001391 acpi_status status;
1392 struct acpi_table_ecdt *ecdt_ptr;
Luming Yu45bea152005-07-23 04:08:00 -04001393
Len Brown50526df2005-08-11 17:32:05 -04001394 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1395 (struct acpi_table_header **)
1396 &ecdt_ptr);
Luming Yu45bea152005-07-23 04:08:00 -04001397 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
Len Brown50526df2005-08-11 17:32:05 -04001419 status =
1420 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
Luming Yu45bea152005-07-23 04:08:00 -04001421 if (ACPI_FAILURE(status)) {
1422 goto error;
1423 }
1424
1425 return 0;
Len Brown50526df2005-08-11 17:32:05 -04001426 error:
Luming Yu45bea152005-07-23 04:08:00 -04001427 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1428 kfree(ec_ecdt);
1429 ec_ecdt = NULL;
1430
1431 return -ENODEV;
1432}
1433
Len Brown50526df2005-08-11 17:32:05 -04001434static int __init acpi_ec_burst_get_real_ecdt(void)
Luming Yu45bea152005-07-23 04:08:00 -04001435{
Len Brown50526df2005-08-11 17:32:05 -04001436 acpi_status status;
1437 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438
Dmitry Torokhov451566f2005-03-19 01:10:05 -05001439 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
Len Brown50526df2005-08-11 17:32:05 -04001440 (struct acpi_table_header **)
1441 &ecdt_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 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 */
Luming Yu45bea152005-07-23 04:08:00 -04001450 ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 if (!ec_ecdt)
1452 return -ENOMEM;
Luming Yu45bea152005-07-23 04:08:00 -04001453 memset(ec_ecdt, 0, sizeof(union acpi_ec));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
Len Brown50526df2005-08-11 17:32:05 -04001455 init_MUTEX(&ec_ecdt->burst.sem);
1456 init_waitqueue_head(&ec_ecdt->burst.wait);
Luming Yu45bea152005-07-23 04:08:00 -04001457 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 /* use the GL just to be safe */
Luming Yu45bea152005-07-23 04:08:00 -04001462 ec_ecdt->common.global_lock = TRUE;
1463 ec_ecdt->common.uid = ecdt_ptr->uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
Len Brown50526df2005-08-11 17:32:05 -04001465 status =
1466 acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 if (ACPI_FAILURE(status)) {
1468 goto error;
1469 }
1470
1471 return 0;
Len Brown50526df2005-08-11 17:32:05 -04001472 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1474 kfree(ec_ecdt);
1475 ec_ecdt = NULL;
1476
1477 return -ENODEV;
1478}
1479
1480static int __initdata acpi_fake_ecdt_enabled;
Len Brown50526df2005-08-11 17:32:05 -04001481int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482{
Len Brown50526df2005-08-11 17:32:05 -04001483 acpi_status status;
1484 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
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 */
Luming Yu45bea152005-07-23 04:08:00 -04001498 status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
Len Brown50526df2005-08-11 17:32:05 -04001499 ACPI_GPE_EDGE_TRIGGERED,
1500 &acpi_ec_gpe_handler, ec_ecdt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 if (ACPI_FAILURE(status)) {
1502 goto error;
1503 }
Len Brown50526df2005-08-11 17:32:05 -04001504 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Len Brown50526df2005-08-11 17:32:05 -04001507 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 if (ACPI_FAILURE(status)) {
Luming Yu45bea152005-07-23 04:08:00 -04001513 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
Len Brown50526df2005-08-11 17:32:05 -04001514 &acpi_ec_gpe_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 goto error;
1516 }
1517
1518 return 0;
1519
Len Brown50526df2005-08-11 17:32:05 -04001520 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1522 kfree(ec_ecdt);
1523 ec_ecdt = NULL;
1524
1525 return -ENODEV;
1526}
1527
Len Brown50526df2005-08-11 17:32:05 -04001528static int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529{
Len Brown50526df2005-08-11 17:32:05 -04001530 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
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
1551subsys_initcall(acpi_ec_init);
1552
1553/* EC driver currently not unloadable */
1554#if 0
Len Brown50526df2005-08-11 17:32:05 -04001555static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556{
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}
Len Brown50526df2005-08-11 17:32:05 -04001565#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
1567static int __init acpi_fake_ecdt_setup(char *str)
1568{
1569 acpi_fake_ecdt_enabled = 1;
1570 return 0;
1571}
Luming Yu7b15f5e2005-08-03 17:38:04 -04001572
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
Luming Yu45bea152005-07-23 04:08:00 -04001574static int __init acpi_ec_set_polling_mode(char *str)
1575{
Luming Yu7b15f5e2005-08-03 17:38:04 -04001576 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 }
Len Brown50526df2005-08-11 17:32:05 -04001588 printk(KERN_INFO PREFIX "EC %s mode.\n", burst ? "burst" : "polling");
Luming Yu45bea152005-07-23 04:08:00 -04001589 return 0;
1590}
Len Brown50526df2005-08-11 17:32:05 -04001591
Luming Yu7b15f5e2005-08-03 17:38:04 -04001592__setup("ec_burst=", acpi_ec_set_polling_mode);