blob: 9ba778a2b484ee1601f53ebd6ccd8278741784f0 [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>
Randy Dunlapd568df82006-07-12 01:47:00 -040028#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
Jeff Garzikbca73e42005-11-13 16:06:25 -080032#include <linux/pm_legacy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/device.h>
34#include <linux/proc_fs.h>
35#ifdef CONFIG_X86
36#include <asm/mpspec.h>
37#endif
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050042ACPI_MODULE_NAME("bus");
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#ifdef CONFIG_X86
44extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
45#endif
46
Len Brown4be44fc2005-08-05 00:44:28 -040047struct acpi_device *acpi_root;
48struct proc_dir_entry *acpi_root_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049EXPORT_SYMBOL(acpi_root_dir);
50
51#define STRUCT_TO_INT(s) (*((int*)&s))
52
53/* --------------------------------------------------------------------------
54 Device Management
55 -------------------------------------------------------------------------- */
56
Len Brown4be44fc2005-08-05 00:44:28 -040057int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
Len Brown4be44fc2005-08-05 00:44:28 -040059 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040063 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 /* TBD: Support fixed-feature devices */
66
Len Brown4be44fc2005-08-05 00:44:28 -040067 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (ACPI_FAILURE(status) || !*device) {
Len Brown9805cb72006-07-25 13:30:57 -040069 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
70 handle));
Patrick Mocheld550d982006-06-27 00:41:40 -040071 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 }
73
Patrick Mocheld550d982006-06-27 00:41:40 -040074 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
Len Brown4be44fc2005-08-05 00:44:28 -040076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077EXPORT_SYMBOL(acpi_bus_get_device);
78
Len Brown4be44fc2005-08-05 00:44:28 -040079int acpi_bus_get_status(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Len Brown4be44fc2005-08-05 00:44:28 -040081 acpi_status status = AE_OK;
82 unsigned long sta = 0;
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040086 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 /*
89 * Evaluate _STA if present.
90 */
91 if (device->flags.dynamic_status) {
Len Brown4be44fc2005-08-05 00:44:28 -040092 status =
93 acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040095 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -040096 STRUCT_TO_INT(device->status) = (int)sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98
99 /*
100 * Otherwise we assume the status of our parent (unless we don't
101 * have one, in which case status is implied).
102 */
103 else if (device->parent)
104 device->status = device->parent->status;
105 else
Bjorn Helgaas0c0e8922007-04-25 14:20:58 -0400106 STRUCT_TO_INT(device->status) =
107 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 if (device->status.functional && !device->status.present) {
111 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
Len Brown4be44fc2005-08-05 00:44:28 -0400112 "functional but not present; setting present\n",
113 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 device->status.present = 1;
115 }
116
Len Brown4be44fc2005-08-05 00:44:28 -0400117 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
118 device->pnp.bus_id,
119 (u32) STRUCT_TO_INT(device->status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Patrick Mocheld550d982006-06-27 00:41:40 -0400121 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Len Brown4be44fc2005-08-05 00:44:28 -0400124EXPORT_SYMBOL(acpi_bus_get_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126/* --------------------------------------------------------------------------
127 Power Management
128 -------------------------------------------------------------------------- */
129
Len Brown4be44fc2005-08-05 00:44:28 -0400130int acpi_bus_get_power(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
Len Brown4be44fc2005-08-05 00:44:28 -0400132 int result = 0;
133 acpi_status status = 0;
134 struct acpi_device *device = NULL;
135 unsigned long psc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 result = acpi_bus_get_device(handle, &device);
139 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400140 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 *state = ACPI_STATE_UNKNOWN;
143
144 if (!device->flags.power_manageable) {
145 /* TBD: Non-recursive algorithm for walking up hierarchy */
146 if (device->parent)
147 *state = device->parent->power.state;
148 else
149 *state = ACPI_STATE_D0;
Len Brown4be44fc2005-08-05 00:44:28 -0400150 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 /*
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500152 * Get the device's power state either directly (via _PSC) or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * indirectly (via power resources).
154 */
155 if (device->power.flags.explicit_get) {
Len Brown4be44fc2005-08-05 00:44:28 -0400156 status = acpi_evaluate_integer(device->handle, "_PSC",
157 NULL, &psc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400159 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400160 device->power.state = (int)psc;
161 } else if (device->power.flags.power_resources) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 result = acpi_power_get_inferred_state(device);
163 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400164 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166
167 *state = device->power.state;
168 }
169
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400171 device->pnp.bus_id, device->power.state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Patrick Mocheld550d982006-06-27 00:41:40 -0400173 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
Len Brown4be44fc2005-08-05 00:44:28 -0400175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176EXPORT_SYMBOL(acpi_bus_get_power);
177
Len Brown4be44fc2005-08-05 00:44:28 -0400178int acpi_bus_set_power(acpi_handle handle, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
Len Brown4be44fc2005-08-05 00:44:28 -0400180 int result = 0;
181 acpi_status status = AE_OK;
182 struct acpi_device *device = NULL;
183 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 result = acpi_bus_get_device(handle, &device);
187 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400188 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400191 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 /* Make sure this is a valid target state */
194
195 if (!device->flags.power_manageable) {
Len Brown9805cb72006-07-25 13:30:57 -0400196 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800197 device->dev.kobj.name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400198 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
David Shaohua Lib9131002005-03-19 00:16:18 -0500200 /*
201 * Get device's current power state if it's unknown
202 * This means device power state isn't initialized or previous setting failed
203 */
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500204 if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
205 acpi_bus_get_power(device->handle, &device->power.state);
206 if ((state == device->power.state) && !device->flags.force_power_state) {
207 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
208 state));
209 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 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
Len Brown14e04fb2007-08-23 15:20:26 -0400279#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280static DEFINE_SPINLOCK(acpi_bus_event_lock);
281
282LIST_HEAD(acpi_bus_event_list);
283DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
284
Len Brown4be44fc2005-08-05 00:44:28 -0400285extern int event_is_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Len Brown14e04fb2007-08-23 15:20:26 -0400287int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Len Brown4be44fc2005-08-05 00:44:28 -0400289 struct acpi_bus_event *event = NULL;
290 unsigned long flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400294 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 /* drop event on the floor if no one's listening */
297 if (!event_is_open)
Patrick Mocheld550d982006-06-27 00:41:40 -0400298 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
301 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400302 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 strcpy(event->device_class, device->pnp.device_class);
305 strcpy(event->bus_id, device->pnp.bus_id);
306 event->type = type;
307 event->data = data;
308
309 spin_lock_irqsave(&acpi_bus_event_lock, flags);
310 list_add_tail(&event->node, &acpi_bus_event_list);
311 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
312
313 wake_up_interruptible(&acpi_bus_event_queue);
314
Patrick Mocheld550d982006-06-27 00:41:40 -0400315 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
Len Brown4be44fc2005-08-05 00:44:28 -0400317
Len Brown14e04fb2007-08-23 15:20:26 -0400318EXPORT_SYMBOL(acpi_bus_generate_proc_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Len Brown4be44fc2005-08-05 00:44:28 -0400320int acpi_bus_receive_event(struct acpi_bus_event *event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Len Brown4be44fc2005-08-05 00:44:28 -0400322 unsigned long flags = 0;
323 struct acpi_bus_event *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 DECLARE_WAITQUEUE(wait, current);
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400329 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 if (list_empty(&acpi_bus_event_list)) {
332
333 set_current_state(TASK_INTERRUPTIBLE);
334 add_wait_queue(&acpi_bus_event_queue, &wait);
335
336 if (list_empty(&acpi_bus_event_list))
337 schedule();
338
339 remove_wait_queue(&acpi_bus_event_queue, &wait);
340 set_current_state(TASK_RUNNING);
341
342 if (signal_pending(current))
Patrick Mocheld550d982006-06-27 00:41:40 -0400343 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345
346 spin_lock_irqsave(&acpi_bus_event_lock, flags);
Len Brown4be44fc2005-08-05 00:44:28 -0400347 entry =
348 list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (entry)
350 list_del(&entry->node);
351 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
352
353 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400354 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 memcpy(event, entry, sizeof(struct acpi_bus_event));
357
358 kfree(entry);
359
Patrick Mocheld550d982006-06-27 00:41:40 -0400360 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Len Brown4be44fc2005-08-05 00:44:28 -0400363EXPORT_SYMBOL(acpi_bus_receive_event);
Len Brown14e04fb2007-08-23 15:20:26 -0400364#endif /* CONFIG_ACPI_PROC_EVENT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366/* --------------------------------------------------------------------------
367 Notification Handling
368 -------------------------------------------------------------------------- */
369
370static int
Len Brown4be44fc2005-08-05 00:44:28 -0400371acpi_bus_check_device(struct acpi_device *device, int *status_changed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
Len Brown4be44fc2005-08-05 00:44:28 -0400373 acpi_status status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 struct acpi_device_status old_status;
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400378 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 if (status_changed)
381 *status_changed = 0;
382
383 old_status = device->status;
384
385 /*
386 * Make sure this device's parent is present before we go about
387 * messing with the device.
388 */
389 if (device->parent && !device->parent->status.present) {
390 device->status = device->parent->status;
391 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
392 if (status_changed)
393 *status_changed = 1;
394 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400395 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
397
398 status = acpi_bus_get_status(device);
399 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400400 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400403 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 if (status_changed)
406 *status_changed = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 /*
409 * Device Insertion/Removal
410 */
411 if ((device->status.present) && !(old_status.present)) {
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
413 /* TBD: Handle device insertion */
Len Brown4be44fc2005-08-05 00:44:28 -0400414 } else if (!(device->status.present) && (old_status.present)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
416 /* TBD: Handle device removal */
417 }
418
Patrick Mocheld550d982006-06-27 00:41:40 -0400419 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
Len Brown4be44fc2005-08-05 00:44:28 -0400422static int acpi_bus_check_scope(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
Len Brown4be44fc2005-08-05 00:44:28 -0400424 int result = 0;
425 int status_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400429 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 /* Status Change? */
432 result = acpi_bus_check_device(device, &status_changed);
433 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400434 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 if (!status_changed)
Patrick Mocheld550d982006-06-27 00:41:40 -0400437 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 /*
440 * TBD: Enumerate child devices within this device's scope and
441 * run acpi_bus_check_device()'s on them.
442 */
443
Patrick Mocheld550d982006-06-27 00:41:40 -0400444 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447/**
448 * acpi_bus_notify
449 * ---------------
450 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
451 */
Len Brown4be44fc2005-08-05 00:44:28 -0400452static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Len Brown4be44fc2005-08-05 00:44:28 -0400454 int result = 0;
455 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
458 if (acpi_bus_get_device(handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400459 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 switch (type) {
462
463 case ACPI_NOTIFY_BUS_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400464 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
465 "Received BUS CHECK notification for device [%s]\n",
466 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 result = acpi_bus_check_scope(device);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500468 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400470 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 */
472 break;
473
474 case ACPI_NOTIFY_DEVICE_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400475 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
476 "Received DEVICE CHECK notification for device [%s]\n",
477 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 result = acpi_bus_check_device(device, NULL);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500479 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400481 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 */
483 break;
484
485 case ACPI_NOTIFY_DEVICE_WAKE:
Len Brown4be44fc2005-08-05 00:44:28 -0400486 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
487 "Received DEVICE WAKE notification for device [%s]\n",
488 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 /* TBD */
490 break;
491
492 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400493 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
494 "Received EJECT REQUEST notification for device [%s]\n",
495 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 /* TBD */
497 break;
498
499 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
Len Brown4be44fc2005-08-05 00:44:28 -0400500 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
501 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
502 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 /* TBD: Exactly what does 'light' mean? */
504 break;
505
506 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400507 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
508 "Received FREQUENCY MISMATCH notification for device [%s]\n",
509 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 /* TBD */
511 break;
512
513 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400514 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
515 "Received BUS MODE MISMATCH notification for device [%s]\n",
516 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 /* TBD */
518 break;
519
520 case ACPI_NOTIFY_POWER_FAULT:
Len Brown4be44fc2005-08-05 00:44:28 -0400521 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
522 "Received POWER FAULT notification for device [%s]\n",
523 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 /* TBD */
525 break;
526
527 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400528 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
529 "Received unknown/unsupported notification [%08x]\n",
530 type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 break;
532 }
533
Patrick Mocheld550d982006-06-27 00:41:40 -0400534 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
537/* --------------------------------------------------------------------------
538 Initialization/Cleanup
539 -------------------------------------------------------------------------- */
540
Len Brown4be44fc2005-08-05 00:44:28 -0400541static int __init acpi_bus_init_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
Len Brown4be44fc2005-08-05 00:44:28 -0400543 acpi_status status = AE_OK;
544 union acpi_object arg = { ACPI_TYPE_INTEGER };
545 struct acpi_object_list arg_list = { 1, &arg };
546 char *message = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500549 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 * Let the system know what interrupt model we are using by
551 * evaluating the \_PIC object, if exists.
552 */
553
554 switch (acpi_irq_model) {
555 case ACPI_IRQ_MODEL_PIC:
556 message = "PIC";
557 break;
558 case ACPI_IRQ_MODEL_IOAPIC:
559 message = "IOAPIC";
560 break;
561 case ACPI_IRQ_MODEL_IOSAPIC:
562 message = "IOSAPIC";
563 break;
John Keller3948ec92006-12-22 11:50:04 -0600564 case ACPI_IRQ_MODEL_PLATFORM:
565 message = "platform specific model";
566 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 default:
568 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400569 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 }
571
572 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
573
574 arg.integer.value = acpi_irq_model;
575
576 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
577 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400578 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400579 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 }
581
Patrick Mocheld550d982006-06-27 00:41:40 -0400582 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
584
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300585acpi_native_uint acpi_gbl_permanent_mmap;
586
587
Len Brown4be44fc2005-08-05 00:44:28 -0400588void __init acpi_early_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Len Brown4be44fc2005-08-05 00:44:28 -0400590 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400593 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Bob Moore616861242006-03-17 16:44:00 -0500595 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 /* enable workarounds, unless strict ACPI spec. compliance */
598 if (!acpi_strict)
599 acpi_gbl_enable_interpreter_slack = TRUE;
600
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300601 acpi_gbl_permanent_mmap = 1;
602
603 status = acpi_reallocate_root_table();
604 if (ACPI_FAILURE(status)) {
605 printk(KERN_ERR PREFIX
606 "Unable to reallocate ACPI tables\n");
607 goto error0;
608 }
609
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 status = acpi_initialize_subsystem();
611 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400612 printk(KERN_ERR PREFIX
613 "Unable to initialize the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 goto error0;
615 }
616
617 status = acpi_load_tables();
618 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400619 printk(KERN_ERR PREFIX
620 "Unable to load the System Description Tables\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 goto error0;
622 }
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624#ifdef CONFIG_X86
625 if (!acpi_ioapic) {
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300626 extern u8 acpi_sci_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 /* compatible (0) means level (3) */
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300629 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
630 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
631 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
632 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 /* Set PIC-mode SCI trigger type */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300634 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300635 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 } else {
637 extern int acpi_sci_override_gsi;
638 /*
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300639 * now that acpi_gbl_FADT is initialized,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 * update it with result from INT_SRC_OVR parsing
641 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300642 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 }
644#endif
645
Len Brown4be44fc2005-08-05 00:44:28 -0400646 status =
647 acpi_enable_subsystem(~
648 (ACPI_NO_HARDWARE_INIT |
649 ACPI_NO_ACPI_ENABLE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 if (ACPI_FAILURE(status)) {
651 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
652 goto error0;
653 }
654
Patrick Mocheld550d982006-06-27 00:41:40 -0400655 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Len Brown4be44fc2005-08-05 00:44:28 -0400657 error0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 disable_acpi();
Patrick Mocheld550d982006-06-27 00:41:40 -0400659 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
661
Len Brown4be44fc2005-08-05 00:44:28 -0400662static int __init acpi_bus_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
Len Brown4be44fc2005-08-05 00:44:28 -0400664 int result = 0;
665 acpi_status status = AE_OK;
666 extern acpi_status acpi_os_initialize1(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 status = acpi_os_initialize1();
670
Len Brown4be44fc2005-08-05 00:44:28 -0400671 status =
672 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400674 printk(KERN_ERR PREFIX
675 "Unable to start the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 goto error1;
677 }
678
679 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400680 printk(KERN_ERR PREFIX
681 "Unable to initialize ACPI OS objects\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 goto error1;
683 }
684#ifdef CONFIG_ACPI_EC
685 /*
686 * ACPI 2.0 requires the EC driver to be loaded and work before
687 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
688 * is called).
689 *
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500690 * This is accomplished by looking for the ECDT table, and getting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 * the EC parameters out of that.
692 */
693 status = acpi_ec_ecdt_probe();
694 /* Ignore result. Not having an ECDT is not fatal. */
695#endif
696
697 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
698 if (ACPI_FAILURE(status)) {
699 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
700 goto error1;
701 }
702
703 printk(KERN_INFO PREFIX "Interpreter enabled\n");
704
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500705 /* Initialize sleep structures */
706 acpi_sleep_init();
707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 /*
709 * Get the system interrupt model and evaluate \_PIC.
710 */
711 result = acpi_bus_init_irq();
712 if (result)
713 goto error1;
714
715 /*
716 * Register the for all standard device notifications.
717 */
Len Brown4be44fc2005-08-05 00:44:28 -0400718 status =
719 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
720 &acpi_bus_notify, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400722 printk(KERN_ERR PREFIX
723 "Unable to register for device notifications\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 goto error1;
725 }
726
727 /*
728 * Create the top ACPI proc directory
729 */
730 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
731
Patrick Mocheld550d982006-06-27 00:41:40 -0400732 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734 /* Mimic structured exception handling */
Len Brown4be44fc2005-08-05 00:44:28 -0400735 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 acpi_terminate();
Patrick Mocheld550d982006-06-27 00:41:40 -0400737 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
Len Brown4be44fc2005-08-05 00:44:28 -0400740decl_subsys(acpi, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Len Brown4be44fc2005-08-05 00:44:28 -0400742static int __init acpi_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
Len Brown4be44fc2005-08-05 00:44:28 -0400744 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (acpi_disabled) {
748 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400749 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
751
Randy Dunlapd568df82006-07-12 01:47:00 -0400752 result = firmware_register(&acpi_subsys);
753 if (result < 0)
754 printk(KERN_WARNING "%s: firmware_register error: %d\n",
755 __FUNCTION__, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 result = acpi_bus_init();
758
759 if (!result) {
Jeff Garzikbca73e42005-11-13 16:06:25 -0800760#ifdef CONFIG_PM_LEGACY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 if (!PM_IS_ACTIVE())
762 pm_active = 1;
763 else {
Len Brown4be44fc2005-08-05 00:44:28 -0400764 printk(KERN_INFO PREFIX
765 "APM is already active, exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 disable_acpi();
767 result = -ENODEV;
768 }
769#endif
770 } else
771 disable_acpi();
772
Patrick Mocheld550d982006-06-27 00:41:40 -0400773 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
776subsys_initcall(acpi_init);