blob: cbfc81579c9af5ddf5760e6ac410174cff203e38 [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",
Greg Kroah-Hartman19c38de2007-09-12 15:06:57 -0700197 kobject_name(&device->dev.kobj)));
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);
Shaohua Li5e321322007-10-11 23:53:58 +0200265 else {
266 device->power.state = state;
Len Brown4be44fc2005-08-05 00:44:28 -0400267 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
268 "Device [%s] transitioned to D%d\n",
269 device->pnp.bus_id, state));
Shaohua Li5e321322007-10-11 23:53:58 +0200270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Patrick Mocheld550d982006-06-27 00:41:40 -0400272 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
Len Brown4be44fc2005-08-05 00:44:28 -0400274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275EXPORT_SYMBOL(acpi_bus_set_power);
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277/* --------------------------------------------------------------------------
278 Event Management
279 -------------------------------------------------------------------------- */
280
Len Brown14e04fb2007-08-23 15:20:26 -0400281#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282static DEFINE_SPINLOCK(acpi_bus_event_lock);
283
284LIST_HEAD(acpi_bus_event_list);
285DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
286
Len Brown4be44fc2005-08-05 00:44:28 -0400287extern int event_is_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Len Brown14e04fb2007-08-23 15:20:26 -0400289int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
Len Brown4be44fc2005-08-05 00:44:28 -0400291 struct acpi_bus_event *event = NULL;
292 unsigned long flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400296 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 /* drop event on the floor if no one's listening */
299 if (!event_is_open)
Patrick Mocheld550d982006-06-27 00:41:40 -0400300 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
303 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400304 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 strcpy(event->device_class, device->pnp.device_class);
307 strcpy(event->bus_id, device->pnp.bus_id);
308 event->type = type;
309 event->data = data;
310
311 spin_lock_irqsave(&acpi_bus_event_lock, flags);
312 list_add_tail(&event->node, &acpi_bus_event_list);
313 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
314
315 wake_up_interruptible(&acpi_bus_event_queue);
316
Patrick Mocheld550d982006-06-27 00:41:40 -0400317 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
Len Brown4be44fc2005-08-05 00:44:28 -0400319
Len Brown14e04fb2007-08-23 15:20:26 -0400320EXPORT_SYMBOL(acpi_bus_generate_proc_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Len Brown4be44fc2005-08-05 00:44:28 -0400322int acpi_bus_receive_event(struct acpi_bus_event *event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
Len Brown4be44fc2005-08-05 00:44:28 -0400324 unsigned long flags = 0;
325 struct acpi_bus_event *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 DECLARE_WAITQUEUE(wait, current);
328
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400331 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 if (list_empty(&acpi_bus_event_list)) {
334
335 set_current_state(TASK_INTERRUPTIBLE);
336 add_wait_queue(&acpi_bus_event_queue, &wait);
337
338 if (list_empty(&acpi_bus_event_list))
339 schedule();
340
341 remove_wait_queue(&acpi_bus_event_queue, &wait);
342 set_current_state(TASK_RUNNING);
343
344 if (signal_pending(current))
Patrick Mocheld550d982006-06-27 00:41:40 -0400345 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
347
348 spin_lock_irqsave(&acpi_bus_event_lock, flags);
Len Brown4be44fc2005-08-05 00:44:28 -0400349 entry =
350 list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (entry)
352 list_del(&entry->node);
353 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
354
355 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400356 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 memcpy(event, entry, sizeof(struct acpi_bus_event));
359
360 kfree(entry);
361
Patrick Mocheld550d982006-06-27 00:41:40 -0400362 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Len Brown4be44fc2005-08-05 00:44:28 -0400365EXPORT_SYMBOL(acpi_bus_receive_event);
Len Brown14e04fb2007-08-23 15:20:26 -0400366#endif /* CONFIG_ACPI_PROC_EVENT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368/* --------------------------------------------------------------------------
369 Notification Handling
370 -------------------------------------------------------------------------- */
371
372static int
Len Brown4be44fc2005-08-05 00:44:28 -0400373acpi_bus_check_device(struct acpi_device *device, int *status_changed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
Len Brown4be44fc2005-08-05 00:44:28 -0400375 acpi_status status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct acpi_device_status old_status;
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400380 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 if (status_changed)
383 *status_changed = 0;
384
385 old_status = device->status;
386
387 /*
388 * Make sure this device's parent is present before we go about
389 * messing with the device.
390 */
391 if (device->parent && !device->parent->status.present) {
392 device->status = device->parent->status;
393 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
394 if (status_changed)
395 *status_changed = 1;
396 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400397 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399
400 status = acpi_bus_get_status(device);
401 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400402 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400405 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 if (status_changed)
408 *status_changed = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 /*
411 * Device Insertion/Removal
412 */
413 if ((device->status.present) && !(old_status.present)) {
414 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
415 /* TBD: Handle device insertion */
Len Brown4be44fc2005-08-05 00:44:28 -0400416 } else if (!(device->status.present) && (old_status.present)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
418 /* TBD: Handle device removal */
419 }
420
Patrick Mocheld550d982006-06-27 00:41:40 -0400421 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
Len Brown4be44fc2005-08-05 00:44:28 -0400424static int acpi_bus_check_scope(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Len Brown4be44fc2005-08-05 00:44:28 -0400426 int result = 0;
427 int status_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400431 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433 /* Status Change? */
434 result = acpi_bus_check_device(device, &status_changed);
435 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400436 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 if (!status_changed)
Patrick Mocheld550d982006-06-27 00:41:40 -0400439 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 /*
442 * TBD: Enumerate child devices within this device's scope and
443 * run acpi_bus_check_device()'s on them.
444 */
445
Patrick Mocheld550d982006-06-27 00:41:40 -0400446 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447}
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449/**
450 * acpi_bus_notify
451 * ---------------
452 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
453 */
Len Brown4be44fc2005-08-05 00:44:28 -0400454static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
Len Brown4be44fc2005-08-05 00:44:28 -0400456 int result = 0;
457 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 if (acpi_bus_get_device(handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400461 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 switch (type) {
464
465 case ACPI_NOTIFY_BUS_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400466 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
467 "Received BUS CHECK notification for device [%s]\n",
468 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 result = acpi_bus_check_scope(device);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500470 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400472 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
474 break;
475
476 case ACPI_NOTIFY_DEVICE_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400477 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
478 "Received DEVICE CHECK notification for device [%s]\n",
479 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 result = acpi_bus_check_device(device, NULL);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500481 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400483 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 */
485 break;
486
487 case ACPI_NOTIFY_DEVICE_WAKE:
Len Brown4be44fc2005-08-05 00:44:28 -0400488 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
489 "Received DEVICE WAKE notification for device [%s]\n",
490 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 /* TBD */
492 break;
493
494 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400495 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
496 "Received EJECT REQUEST notification for device [%s]\n",
497 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 /* TBD */
499 break;
500
501 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
Len Brown4be44fc2005-08-05 00:44:28 -0400502 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
503 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
504 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 /* TBD: Exactly what does 'light' mean? */
506 break;
507
508 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400509 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
510 "Received FREQUENCY MISMATCH notification for device [%s]\n",
511 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 /* TBD */
513 break;
514
515 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400516 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
517 "Received BUS MODE MISMATCH notification for device [%s]\n",
518 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 /* TBD */
520 break;
521
522 case ACPI_NOTIFY_POWER_FAULT:
Len Brown4be44fc2005-08-05 00:44:28 -0400523 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
524 "Received POWER FAULT notification for device [%s]\n",
525 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 /* TBD */
527 break;
528
529 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531 "Received unknown/unsupported notification [%08x]\n",
532 type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 break;
534 }
535
Patrick Mocheld550d982006-06-27 00:41:40 -0400536 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
539/* --------------------------------------------------------------------------
540 Initialization/Cleanup
541 -------------------------------------------------------------------------- */
542
Len Brown4be44fc2005-08-05 00:44:28 -0400543static int __init acpi_bus_init_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Len Brown4be44fc2005-08-05 00:44:28 -0400545 acpi_status status = AE_OK;
546 union acpi_object arg = { ACPI_TYPE_INTEGER };
547 struct acpi_object_list arg_list = { 1, &arg };
548 char *message = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500551 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 * Let the system know what interrupt model we are using by
553 * evaluating the \_PIC object, if exists.
554 */
555
556 switch (acpi_irq_model) {
557 case ACPI_IRQ_MODEL_PIC:
558 message = "PIC";
559 break;
560 case ACPI_IRQ_MODEL_IOAPIC:
561 message = "IOAPIC";
562 break;
563 case ACPI_IRQ_MODEL_IOSAPIC:
564 message = "IOSAPIC";
565 break;
John Keller3948ec92006-12-22 11:50:04 -0600566 case ACPI_IRQ_MODEL_PLATFORM:
567 message = "platform specific model";
568 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 default:
570 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400571 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 }
573
574 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
575
576 arg.integer.value = acpi_irq_model;
577
578 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
579 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400580 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400581 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 }
583
Patrick Mocheld550d982006-06-27 00:41:40 -0400584 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300587acpi_native_uint acpi_gbl_permanent_mmap;
588
589
Len Brown4be44fc2005-08-05 00:44:28 -0400590void __init acpi_early_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Len Brown4be44fc2005-08-05 00:44:28 -0400592 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400595 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Bob Moore61686122006-03-17 16:44:00 -0500597 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 /* enable workarounds, unless strict ACPI spec. compliance */
600 if (!acpi_strict)
601 acpi_gbl_enable_interpreter_slack = TRUE;
602
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300603 acpi_gbl_permanent_mmap = 1;
604
605 status = acpi_reallocate_root_table();
606 if (ACPI_FAILURE(status)) {
607 printk(KERN_ERR PREFIX
608 "Unable to reallocate ACPI tables\n");
609 goto error0;
610 }
611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 status = acpi_initialize_subsystem();
613 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400614 printk(KERN_ERR PREFIX
615 "Unable to initialize the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 goto error0;
617 }
618
619 status = acpi_load_tables();
620 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400621 printk(KERN_ERR PREFIX
622 "Unable to load the System Description Tables\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 goto error0;
624 }
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626#ifdef CONFIG_X86
627 if (!acpi_ioapic) {
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300628 extern u8 acpi_sci_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 /* compatible (0) means level (3) */
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300631 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
632 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
633 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 /* Set PIC-mode SCI trigger type */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300636 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300637 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 } else {
639 extern int acpi_sci_override_gsi;
640 /*
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300641 * now that acpi_gbl_FADT is initialized,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 * update it with result from INT_SRC_OVR parsing
643 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300644 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 }
646#endif
647
Len Brown4be44fc2005-08-05 00:44:28 -0400648 status =
649 acpi_enable_subsystem(~
650 (ACPI_NO_HARDWARE_INIT |
651 ACPI_NO_ACPI_ENABLE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (ACPI_FAILURE(status)) {
653 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
654 goto error0;
655 }
656
Patrick Mocheld550d982006-06-27 00:41:40 -0400657 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Len Brown4be44fc2005-08-05 00:44:28 -0400659 error0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 disable_acpi();
Patrick Mocheld550d982006-06-27 00:41:40 -0400661 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
Len Brown4be44fc2005-08-05 00:44:28 -0400664static int __init acpi_bus_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
Len Brown4be44fc2005-08-05 00:44:28 -0400666 int result = 0;
667 acpi_status status = AE_OK;
668 extern acpi_status acpi_os_initialize1(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 status = acpi_os_initialize1();
672
Len Brown4be44fc2005-08-05 00:44:28 -0400673 status =
674 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400676 printk(KERN_ERR PREFIX
677 "Unable to start the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 goto error1;
679 }
680
681 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400682 printk(KERN_ERR PREFIX
683 "Unable to initialize ACPI OS objects\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 goto error1;
685 }
686#ifdef CONFIG_ACPI_EC
687 /*
688 * ACPI 2.0 requires the EC driver to be loaded and work before
689 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
690 * is called).
691 *
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500692 * This is accomplished by looking for the ECDT table, and getting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 * the EC parameters out of that.
694 */
695 status = acpi_ec_ecdt_probe();
696 /* Ignore result. Not having an ECDT is not fatal. */
697#endif
698
699 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
700 if (ACPI_FAILURE(status)) {
701 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
702 goto error1;
703 }
704
705 printk(KERN_INFO PREFIX "Interpreter enabled\n");
706
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500707 /* Initialize sleep structures */
708 acpi_sleep_init();
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 /*
711 * Get the system interrupt model and evaluate \_PIC.
712 */
713 result = acpi_bus_init_irq();
714 if (result)
715 goto error1;
716
717 /*
718 * Register the for all standard device notifications.
719 */
Len Brown4be44fc2005-08-05 00:44:28 -0400720 status =
721 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
722 &acpi_bus_notify, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400724 printk(KERN_ERR PREFIX
725 "Unable to register for device notifications\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 goto error1;
727 }
728
729 /*
730 * Create the top ACPI proc directory
731 */
732 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
733
Patrick Mocheld550d982006-06-27 00:41:40 -0400734 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 /* Mimic structured exception handling */
Len Brown4be44fc2005-08-05 00:44:28 -0400737 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 acpi_terminate();
Patrick Mocheld550d982006-06-27 00:41:40 -0400739 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
Len Brown4be44fc2005-08-05 00:44:28 -0400742decl_subsys(acpi, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Len Brown4be44fc2005-08-05 00:44:28 -0400744static int __init acpi_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
Len Brown4be44fc2005-08-05 00:44:28 -0400746 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (acpi_disabled) {
750 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400751 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
753
Randy Dunlapd568df82006-07-12 01:47:00 -0400754 result = firmware_register(&acpi_subsys);
755 if (result < 0)
756 printk(KERN_WARNING "%s: firmware_register error: %d\n",
757 __FUNCTION__, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
759 result = acpi_bus_init();
760
761 if (!result) {
Jeff Garzikbca73e42005-11-13 16:06:25 -0800762#ifdef CONFIG_PM_LEGACY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 if (!PM_IS_ACTIVE())
764 pm_active = 1;
765 else {
Len Brown4be44fc2005-08-05 00:44:28 -0400766 printk(KERN_INFO PREFIX
767 "APM is already active, exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 disable_acpi();
769 result = -ENODEV;
770 }
771#endif
772 } else
773 disable_acpi();
774
Patrick Mocheld550d982006-06-27 00:41:40 -0400775 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
778subsys_initcall(acpi_init);