blob: b2977695e12091ab6e945b20432178a953a81114 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/list.h>
29#include <linux/sched.h>
30#include <linux/pm.h>
Jeff Garzikbca73e42005-11-13 16:06:25 -080031#include <linux/pm_legacy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/device.h>
33#include <linux/proc_fs.h>
34#ifdef CONFIG_X86
35#include <asm/mpspec.h>
36#endif
37#include <acpi/acpi_bus.h>
38#include <acpi/acpi_drivers.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define _COMPONENT ACPI_BUS_COMPONENT
Len Brown4be44fc2005-08-05 00:44:28 -040041ACPI_MODULE_NAME("acpi_bus")
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#ifdef CONFIG_X86
43extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
44#endif
45
Bob Moore793c2382006-03-31 00:00:00 -050046struct fadt_descriptor acpi_fadt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047EXPORT_SYMBOL(acpi_fadt);
48
Len Brown4be44fc2005-08-05 00:44:28 -040049struct acpi_device *acpi_root;
50struct proc_dir_entry *acpi_root_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051EXPORT_SYMBOL(acpi_root_dir);
52
53#define STRUCT_TO_INT(s) (*((int*)&s))
54
55/* --------------------------------------------------------------------------
56 Device Management
57 -------------------------------------------------------------------------- */
58
Len Brown4be44fc2005-08-05 00:44:28 -040059int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
Len Brown4be44fc2005-08-05 00:44:28 -040061 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040065 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67 /* TBD: Support fixed-feature devices */
68
Len Brown4be44fc2005-08-05 00:44:28 -040069 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 if (ACPI_FAILURE(status) || !*device) {
Thomas Renningera6fc6722006-06-26 23:58:43 -040071 ACPI_EXCEPTION((AE_INFO, status, "No context for object [%p]", handle));
Patrick Mocheld550d982006-06-27 00:41:40 -040072 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 }
74
Patrick Mocheld550d982006-06-27 00:41:40 -040075 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
Len Brown4be44fc2005-08-05 00:44:28 -040077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078EXPORT_SYMBOL(acpi_bus_get_device);
79
Len Brown4be44fc2005-08-05 00:44:28 -040080int acpi_bus_get_status(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Len Brown4be44fc2005-08-05 00:44:28 -040082 acpi_status status = AE_OK;
83 unsigned long sta = 0;
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040087 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 /*
90 * Evaluate _STA if present.
91 */
92 if (device->flags.dynamic_status) {
Len Brown4be44fc2005-08-05 00:44:28 -040093 status =
94 acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040096 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -040097 STRUCT_TO_INT(device->status) = (int)sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99
100 /*
101 * Otherwise we assume the status of our parent (unless we don't
102 * have one, in which case status is implied).
103 */
104 else if (device->parent)
105 device->status = device->parent->status;
106 else
107 STRUCT_TO_INT(device->status) = 0x0F;
108
109 if (device->status.functional && !device->status.present) {
110 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
Len Brown4be44fc2005-08-05 00:44:28 -0400111 "functional but not present; setting present\n",
112 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 device->status.present = 1;
114 }
115
Len Brown4be44fc2005-08-05 00:44:28 -0400116 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
117 device->pnp.bus_id,
118 (u32) STRUCT_TO_INT(device->status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Patrick Mocheld550d982006-06-27 00:41:40 -0400120 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Len Brown4be44fc2005-08-05 00:44:28 -0400123EXPORT_SYMBOL(acpi_bus_get_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125/* --------------------------------------------------------------------------
126 Power Management
127 -------------------------------------------------------------------------- */
128
Len Brown4be44fc2005-08-05 00:44:28 -0400129int acpi_bus_get_power(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Len Brown4be44fc2005-08-05 00:44:28 -0400131 int result = 0;
132 acpi_status status = 0;
133 struct acpi_device *device = NULL;
134 unsigned long psc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 result = acpi_bus_get_device(handle, &device);
138 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 *state = ACPI_STATE_UNKNOWN;
142
143 if (!device->flags.power_manageable) {
144 /* TBD: Non-recursive algorithm for walking up hierarchy */
145 if (device->parent)
146 *state = device->parent->power.state;
147 else
148 *state = ACPI_STATE_D0;
Len Brown4be44fc2005-08-05 00:44:28 -0400149 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 /*
151 * Get the device's power state either directly (via _PSC) or
152 * indirectly (via power resources).
153 */
154 if (device->power.flags.explicit_get) {
Len Brown4be44fc2005-08-05 00:44:28 -0400155 status = acpi_evaluate_integer(device->handle, "_PSC",
156 NULL, &psc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400158 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400159 device->power.state = (int)psc;
160 } else if (device->power.flags.power_resources) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 result = acpi_power_get_inferred_state(device);
162 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400163 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 *state = device->power.state;
167 }
168
169 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400170 device->pnp.bus_id, device->power.state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Patrick Mocheld550d982006-06-27 00:41:40 -0400172 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
Len Brown4be44fc2005-08-05 00:44:28 -0400174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175EXPORT_SYMBOL(acpi_bus_get_power);
176
Len Brown4be44fc2005-08-05 00:44:28 -0400177int acpi_bus_set_power(acpi_handle handle, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Len Brown4be44fc2005-08-05 00:44:28 -0400179 int result = 0;
180 acpi_status status = AE_OK;
181 struct acpi_device *device = NULL;
182 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 result = acpi_bus_get_device(handle, &device);
186 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400187 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400190 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 /* Make sure this is a valid target state */
193
194 if (!device->flags.power_manageable) {
Len Brownaf4f9492006-07-09 16:33:26 -0400195 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable",
196 device->kobj.name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400197 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
David Shaohua Lib9131002005-03-19 00:16:18 -0500199 /*
200 * Get device's current power state if it's unknown
201 * This means device power state isn't initialized or previous setting failed
202 */
Konstantin Karasyov0feabb02006-05-08 00:00:00 -0400203 if (!device->flags.force_power_state) {
204 if (device->power.state == ACPI_STATE_UNKNOWN)
205 acpi_bus_get_power(device->handle, &device->power.state);
206 if (state == device->power.state) {
207 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
208 state));
Patrick Mocheld550d982006-06-27 00:41:40 -0400209 return 0;
Konstantin Karasyov0feabb02006-05-08 00:00:00 -0400210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
212 if (!device->power.states[state].flags.valid) {
Len Browncece9292006-06-26 23:04:31 -0400213 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
Patrick Mocheld550d982006-06-27 00:41:40 -0400214 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216 if (device->parent && (state < device->parent->power.state)) {
Len Browncece9292006-06-26 23:04:31 -0400217 printk(KERN_WARNING PREFIX
Thomas Renningera6fc6722006-06-26 23:58:43 -0400218 "Cannot set device to a higher-powered"
Len Browncece9292006-06-26 23:04:31 -0400219 " state than parent\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400220 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 }
222
223 /*
224 * Transition Power
225 * ----------------
226 * On transitions to a high-powered state we first apply power (via
227 * power resources) then evalute _PSx. Conversly for transitions to
228 * a lower-powered state.
David Shaohua Lib9131002005-03-19 00:16:18 -0500229 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (state < device->power.state) {
231 if (device->power.flags.power_resources) {
232 result = acpi_power_transition(device, state);
233 if (result)
234 goto end;
235 }
236 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400237 status = acpi_evaluate_object(device->handle,
238 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (ACPI_FAILURE(status)) {
240 result = -ENODEV;
241 goto end;
242 }
243 }
Len Brown4be44fc2005-08-05 00:44:28 -0400244 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400246 status = acpi_evaluate_object(device->handle,
247 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (ACPI_FAILURE(status)) {
249 result = -ENODEV;
250 goto end;
251 }
252 }
253 if (device->power.flags.power_resources) {
254 result = acpi_power_transition(device, state);
255 if (result)
256 goto end;
257 }
258 }
259
Len Brown4be44fc2005-08-05 00:44:28 -0400260 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (result)
Len Browncece9292006-06-26 23:04:31 -0400262 printk(KERN_WARNING PREFIX
263 "Transitioning device [%s] to D%d\n",
264 device->pnp.bus_id, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 else
Len Brown4be44fc2005-08-05 00:44:28 -0400266 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267 "Device [%s] transitioned to D%d\n",
268 device->pnp.bus_id, state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Patrick Mocheld550d982006-06-27 00:41:40 -0400270 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
Len Brown4be44fc2005-08-05 00:44:28 -0400272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273EXPORT_SYMBOL(acpi_bus_set_power);
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275/* --------------------------------------------------------------------------
276 Event Management
277 -------------------------------------------------------------------------- */
278
279static DEFINE_SPINLOCK(acpi_bus_event_lock);
280
281LIST_HEAD(acpi_bus_event_list);
282DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
283
Len Brown4be44fc2005-08-05 00:44:28 -0400284extern int event_is_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Len Brown4be44fc2005-08-05 00:44:28 -0400286int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Len Brown4be44fc2005-08-05 00:44:28 -0400288 struct acpi_bus_event *event = NULL;
289 unsigned long flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 /* drop event on the floor if no one's listening */
296 if (!event_is_open)
Patrick Mocheld550d982006-06-27 00:41:40 -0400297 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
300 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400301 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 strcpy(event->device_class, device->pnp.device_class);
304 strcpy(event->bus_id, device->pnp.bus_id);
305 event->type = type;
306 event->data = data;
307
308 spin_lock_irqsave(&acpi_bus_event_lock, flags);
309 list_add_tail(&event->node, &acpi_bus_event_list);
310 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
311
312 wake_up_interruptible(&acpi_bus_event_queue);
313
Patrick Mocheld550d982006-06-27 00:41:40 -0400314 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
Len Brown4be44fc2005-08-05 00:44:28 -0400316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317EXPORT_SYMBOL(acpi_bus_generate_event);
318
Len Brown4be44fc2005-08-05 00:44:28 -0400319int acpi_bus_receive_event(struct acpi_bus_event *event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Len Brown4be44fc2005-08-05 00:44:28 -0400321 unsigned long flags = 0;
322 struct acpi_bus_event *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 DECLARE_WAITQUEUE(wait, current);
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400328 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 if (list_empty(&acpi_bus_event_list)) {
331
332 set_current_state(TASK_INTERRUPTIBLE);
333 add_wait_queue(&acpi_bus_event_queue, &wait);
334
335 if (list_empty(&acpi_bus_event_list))
336 schedule();
337
338 remove_wait_queue(&acpi_bus_event_queue, &wait);
339 set_current_state(TASK_RUNNING);
340
341 if (signal_pending(current))
Patrick Mocheld550d982006-06-27 00:41:40 -0400342 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
344
345 spin_lock_irqsave(&acpi_bus_event_lock, flags);
Len Brown4be44fc2005-08-05 00:44:28 -0400346 entry =
347 list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 if (entry)
349 list_del(&entry->node);
350 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
351
352 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400353 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 memcpy(event, entry, sizeof(struct acpi_bus_event));
356
357 kfree(entry);
358
Patrick Mocheld550d982006-06-27 00:41:40 -0400359 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Len Brown4be44fc2005-08-05 00:44:28 -0400362EXPORT_SYMBOL(acpi_bus_receive_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364/* --------------------------------------------------------------------------
365 Notification Handling
366 -------------------------------------------------------------------------- */
367
368static int
Len Brown4be44fc2005-08-05 00:44:28 -0400369acpi_bus_check_device(struct acpi_device *device, int *status_changed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370{
Len Brown4be44fc2005-08-05 00:44:28 -0400371 acpi_status status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 struct acpi_device_status old_status;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
375 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400376 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 if (status_changed)
379 *status_changed = 0;
380
381 old_status = device->status;
382
383 /*
384 * Make sure this device's parent is present before we go about
385 * messing with the device.
386 */
387 if (device->parent && !device->parent->status.present) {
388 device->status = device->parent->status;
389 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
390 if (status_changed)
391 *status_changed = 1;
392 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400393 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 }
395
396 status = acpi_bus_get_status(device);
397 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400398 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400401 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 if (status_changed)
404 *status_changed = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 /*
407 * Device Insertion/Removal
408 */
409 if ((device->status.present) && !(old_status.present)) {
410 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
411 /* TBD: Handle device insertion */
Len Brown4be44fc2005-08-05 00:44:28 -0400412 } else if (!(device->status.present) && (old_status.present)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
414 /* TBD: Handle device removal */
415 }
416
Patrick Mocheld550d982006-06-27 00:41:40 -0400417 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Len Brown4be44fc2005-08-05 00:44:28 -0400420static int acpi_bus_check_scope(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Len Brown4be44fc2005-08-05 00:44:28 -0400422 int result = 0;
423 int status_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400427 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 /* Status Change? */
430 result = acpi_bus_check_device(device, &status_changed);
431 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400432 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 if (!status_changed)
Patrick Mocheld550d982006-06-27 00:41:40 -0400435 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437 /*
438 * TBD: Enumerate child devices within this device's scope and
439 * run acpi_bus_check_device()'s on them.
440 */
441
Patrick Mocheld550d982006-06-27 00:41:40 -0400442 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445/**
446 * acpi_bus_notify
447 * ---------------
448 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
449 */
Len Brown4be44fc2005-08-05 00:44:28 -0400450static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Len Brown4be44fc2005-08-05 00:44:28 -0400452 int result = 0;
453 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 if (acpi_bus_get_device(handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400457 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 switch (type) {
460
461 case ACPI_NOTIFY_BUS_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400462 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
463 "Received BUS CHECK notification for device [%s]\n",
464 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 result = acpi_bus_check_scope(device);
466 /*
467 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400468 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 */
470 break;
471
472 case ACPI_NOTIFY_DEVICE_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400473 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
474 "Received DEVICE CHECK notification for device [%s]\n",
475 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 result = acpi_bus_check_device(device, NULL);
477 /*
478 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400479 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 */
481 break;
482
483 case ACPI_NOTIFY_DEVICE_WAKE:
Len Brown4be44fc2005-08-05 00:44:28 -0400484 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
485 "Received DEVICE WAKE notification for device [%s]\n",
486 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 /* TBD */
488 break;
489
490 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400491 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
492 "Received EJECT REQUEST notification for device [%s]\n",
493 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 /* TBD */
495 break;
496
497 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
Len Brown4be44fc2005-08-05 00:44:28 -0400498 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
499 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
500 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 /* TBD: Exactly what does 'light' mean? */
502 break;
503
504 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400505 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
506 "Received FREQUENCY MISMATCH notification for device [%s]\n",
507 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 /* TBD */
509 break;
510
511 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400512 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
513 "Received BUS MODE MISMATCH notification for device [%s]\n",
514 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 /* TBD */
516 break;
517
518 case ACPI_NOTIFY_POWER_FAULT:
Len Brown4be44fc2005-08-05 00:44:28 -0400519 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
520 "Received POWER FAULT notification for device [%s]\n",
521 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 /* TBD */
523 break;
524
525 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400526 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
527 "Received unknown/unsupported notification [%08x]\n",
528 type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 break;
530 }
531
Patrick Mocheld550d982006-06-27 00:41:40 -0400532 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533}
534
535/* --------------------------------------------------------------------------
536 Initialization/Cleanup
537 -------------------------------------------------------------------------- */
538
Len Brown4be44fc2005-08-05 00:44:28 -0400539static int __init acpi_bus_init_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540{
Len Brown4be44fc2005-08-05 00:44:28 -0400541 acpi_status status = AE_OK;
542 union acpi_object arg = { ACPI_TYPE_INTEGER };
543 struct acpi_object_list arg_list = { 1, &arg };
544 char *message = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
547 /*
548 * Let the system know what interrupt model we are using by
549 * evaluating the \_PIC object, if exists.
550 */
551
552 switch (acpi_irq_model) {
553 case ACPI_IRQ_MODEL_PIC:
554 message = "PIC";
555 break;
556 case ACPI_IRQ_MODEL_IOAPIC:
557 message = "IOAPIC";
558 break;
559 case ACPI_IRQ_MODEL_IOSAPIC:
560 message = "IOSAPIC";
561 break;
562 default:
563 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400564 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566
567 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
568
569 arg.integer.value = acpi_irq_model;
570
571 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
572 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400573 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400574 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
576
Patrick Mocheld550d982006-06-27 00:41:40 -0400577 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
Len Brown4be44fc2005-08-05 00:44:28 -0400580void __init acpi_early_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581{
Len Brown4be44fc2005-08-05 00:44:28 -0400582 acpi_status status = AE_OK;
583 struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400587 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Bob Moore61686122006-03-17 16:44:00 -0500589 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 /* enable workarounds, unless strict ACPI spec. compliance */
592 if (!acpi_strict)
593 acpi_gbl_enable_interpreter_slack = TRUE;
594
595 status = acpi_initialize_subsystem();
596 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400597 printk(KERN_ERR PREFIX
598 "Unable to initialize the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 goto error0;
600 }
601
602 status = acpi_load_tables();
603 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400604 printk(KERN_ERR PREFIX
605 "Unable to load the System Description Tables\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 goto error0;
607 }
608
609 /*
610 * Get a separate copy of the FADT for use by other drivers.
611 */
Bob Mooreb229cf92006-04-21 17:15:00 -0400612 status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 if (ACPI_FAILURE(status)) {
614 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
615 goto error0;
616 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617#ifdef CONFIG_X86
618 if (!acpi_ioapic) {
619 extern acpi_interrupt_flags acpi_sci_flags;
620
621 /* compatible (0) means level (3) */
622 if (acpi_sci_flags.trigger == 0)
623 acpi_sci_flags.trigger = 3;
624
625 /* Set PIC-mode SCI trigger type */
Len Brown4be44fc2005-08-05 00:44:28 -0400626 acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
627 acpi_sci_flags.trigger);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 } else {
629 extern int acpi_sci_override_gsi;
630 /*
631 * now that acpi_fadt is initialized,
632 * update it with result from INT_SRC_OVR parsing
633 */
634 acpi_fadt.sci_int = acpi_sci_override_gsi;
635 }
636#endif
637
Len Brown4be44fc2005-08-05 00:44:28 -0400638 status =
639 acpi_enable_subsystem(~
640 (ACPI_NO_HARDWARE_INIT |
641 ACPI_NO_ACPI_ENABLE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 if (ACPI_FAILURE(status)) {
643 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
644 goto error0;
645 }
646
Patrick Mocheld550d982006-06-27 00:41:40 -0400647 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Len Brown4be44fc2005-08-05 00:44:28 -0400649 error0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 disable_acpi();
Patrick Mocheld550d982006-06-27 00:41:40 -0400651 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653
Len Brown4be44fc2005-08-05 00:44:28 -0400654static int __init acpi_bus_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Len Brown4be44fc2005-08-05 00:44:28 -0400656 int result = 0;
657 acpi_status status = AE_OK;
658 extern acpi_status acpi_os_initialize1(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 status = acpi_os_initialize1();
662
Len Brown4be44fc2005-08-05 00:44:28 -0400663 status =
664 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400666 printk(KERN_ERR PREFIX
667 "Unable to start the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 goto error1;
669 }
670
671 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400672 printk(KERN_ERR PREFIX
673 "Unable to initialize ACPI OS objects\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 goto error1;
675 }
676#ifdef CONFIG_ACPI_EC
677 /*
678 * ACPI 2.0 requires the EC driver to be loaded and work before
679 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
680 * is called).
681 *
682 * This is accomplished by looking for the ECDT table, and getting
683 * the EC parameters out of that.
684 */
685 status = acpi_ec_ecdt_probe();
686 /* Ignore result. Not having an ECDT is not fatal. */
687#endif
688
689 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
690 if (ACPI_FAILURE(status)) {
691 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
692 goto error1;
693 }
694
695 printk(KERN_INFO PREFIX "Interpreter enabled\n");
696
697 /*
698 * Get the system interrupt model and evaluate \_PIC.
699 */
700 result = acpi_bus_init_irq();
701 if (result)
702 goto error1;
703
704 /*
705 * Register the for all standard device notifications.
706 */
Len Brown4be44fc2005-08-05 00:44:28 -0400707 status =
708 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
709 &acpi_bus_notify, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400711 printk(KERN_ERR PREFIX
712 "Unable to register for device notifications\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 goto error1;
714 }
715
716 /*
717 * Create the top ACPI proc directory
718 */
719 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
720
Patrick Mocheld550d982006-06-27 00:41:40 -0400721 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723 /* Mimic structured exception handling */
Len Brown4be44fc2005-08-05 00:44:28 -0400724 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 acpi_terminate();
Patrick Mocheld550d982006-06-27 00:41:40 -0400726 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727}
728
Len Brown4be44fc2005-08-05 00:44:28 -0400729decl_subsys(acpi, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Len Brown4be44fc2005-08-05 00:44:28 -0400731static int __init acpi_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
Len Brown4be44fc2005-08-05 00:44:28 -0400733 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 if (acpi_disabled) {
737 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400738 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 }
740
741 firmware_register(&acpi_subsys);
742
743 result = acpi_bus_init();
744
745 if (!result) {
Jeff Garzikbca73e42005-11-13 16:06:25 -0800746#ifdef CONFIG_PM_LEGACY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (!PM_IS_ACTIVE())
748 pm_active = 1;
749 else {
Len Brown4be44fc2005-08-05 00:44:28 -0400750 printk(KERN_INFO PREFIX
751 "APM is already active, exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 disable_acpi();
753 result = -ENODEV;
754 }
755#endif
756 } else
757 disable_acpi();
758
Patrick Mocheld550d982006-06-27 00:41:40 -0400759 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
762subsys_initcall(acpi_init);