blob: 8df325dafe0f6a31f1d3f01df1eeb77ef1cd7fe6 [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>
32#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 Brownf52fd662007-02-12 22:42:12 -050041ACPI_MODULE_NAME("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
Len Brown4be44fc2005-08-05 00:44:28 -040046struct acpi_device *acpi_root;
47struct proc_dir_entry *acpi_root_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048EXPORT_SYMBOL(acpi_root_dir);
49
50#define STRUCT_TO_INT(s) (*((int*)&s))
51
52/* --------------------------------------------------------------------------
53 Device Management
54 -------------------------------------------------------------------------- */
55
Len Brown4be44fc2005-08-05 00:44:28 -040056int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Len Brown4be44fc2005-08-05 00:44:28 -040058 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040062 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 /* TBD: Support fixed-feature devices */
65
Len Brown4be44fc2005-08-05 00:44:28 -040066 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (ACPI_FAILURE(status) || !*device) {
Len Brown9805cb72006-07-25 13:30:57 -040068 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
69 handle));
Patrick Mocheld550d982006-06-27 00:41:40 -040070 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
72
Patrick Mocheld550d982006-06-27 00:41:40 -040073 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074}
Len Brown4be44fc2005-08-05 00:44:28 -040075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076EXPORT_SYMBOL(acpi_bus_get_device);
77
Len Brown4be44fc2005-08-05 00:44:28 -040078int acpi_bus_get_status(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
Len Brown4be44fc2005-08-05 00:44:28 -040080 acpi_status status = AE_OK;
81 unsigned long sta = 0;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040085 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 /*
88 * Evaluate _STA if present.
89 */
90 if (device->flags.dynamic_status) {
Len Brown4be44fc2005-08-05 00:44:28 -040091 status =
92 acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040094 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -040095 STRUCT_TO_INT(device->status) = (int)sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
97
98 /*
99 * Otherwise we assume the status of our parent (unless we don't
100 * have one, in which case status is implied).
101 */
102 else if (device->parent)
103 device->status = device->parent->status;
104 else
Bjorn Helgaas0c0e8922007-04-25 14:20:58 -0400105 STRUCT_TO_INT(device->status) =
106 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
107 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
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
Zhang Rui20733932008-01-17 15:51:21 +0800125void acpi_bus_private_data_handler(acpi_handle handle,
126 u32 function, void *context)
127{
128 return;
129}
130EXPORT_SYMBOL(acpi_bus_private_data_handler);
131
132int acpi_bus_get_private_data(acpi_handle handle, void **data)
133{
134 acpi_status status = AE_OK;
135
136 if (!*data)
137 return -EINVAL;
138
139 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
140 if (ACPI_FAILURE(status) || !*data) {
141 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
142 handle));
143 return -ENODEV;
144 }
145
146 return 0;
147}
148EXPORT_SYMBOL(acpi_bus_get_private_data);
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/* --------------------------------------------------------------------------
151 Power Management
152 -------------------------------------------------------------------------- */
153
Len Brown4be44fc2005-08-05 00:44:28 -0400154int acpi_bus_get_power(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Len Brown4be44fc2005-08-05 00:44:28 -0400156 int result = 0;
157 acpi_status status = 0;
158 struct acpi_device *device = NULL;
159 unsigned long psc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 result = acpi_bus_get_device(handle, &device);
163 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400164 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 *state = ACPI_STATE_UNKNOWN;
167
168 if (!device->flags.power_manageable) {
169 /* TBD: Non-recursive algorithm for walking up hierarchy */
170 if (device->parent)
171 *state = device->parent->power.state;
172 else
173 *state = ACPI_STATE_D0;
Len Brown4be44fc2005-08-05 00:44:28 -0400174 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 /*
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500176 * Get the device's power state either directly (via _PSC) or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * indirectly (via power resources).
178 */
179 if (device->power.flags.explicit_get) {
Len Brown4be44fc2005-08-05 00:44:28 -0400180 status = acpi_evaluate_integer(device->handle, "_PSC",
181 NULL, &psc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400183 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400184 device->power.state = (int)psc;
185 } else if (device->power.flags.power_resources) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 result = acpi_power_get_inferred_state(device);
187 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400188 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190
191 *state = device->power.state;
192 }
193
194 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400195 device->pnp.bus_id, device->power.state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Patrick Mocheld550d982006-06-27 00:41:40 -0400197 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
Len Brown4be44fc2005-08-05 00:44:28 -0400199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200EXPORT_SYMBOL(acpi_bus_get_power);
201
Len Brown4be44fc2005-08-05 00:44:28 -0400202int acpi_bus_set_power(acpi_handle handle, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
Len Brown4be44fc2005-08-05 00:44:28 -0400204 int result = 0;
205 acpi_status status = AE_OK;
206 struct acpi_device *device = NULL;
207 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 result = acpi_bus_get_device(handle, &device);
211 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400215 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 /* Make sure this is a valid target state */
218
219 if (!device->flags.power_manageable) {
Len Brown9805cb72006-07-25 13:30:57 -0400220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
Greg Kroah-Hartman19c38de2007-09-12 15:06:57 -0700221 kobject_name(&device->dev.kobj)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400222 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 }
David Shaohua Lib9131002005-03-19 00:16:18 -0500224 /*
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400225 * Get device's current power state
David Shaohua Lib9131002005-03-19 00:16:18 -0500226 */
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400227 acpi_bus_get_power(device->handle, &device->power.state);
Len Brownec683732008-01-23 22:41:20 -0500228 if ((state == device->power.state) && !device->flags.force_power_state) {
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500229 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
230 state));
231 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (!device->power.states[state].flags.valid) {
Len Browncece9292006-06-26 23:04:31 -0400235 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
Patrick Mocheld550d982006-06-27 00:41:40 -0400236 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 }
238 if (device->parent && (state < device->parent->power.state)) {
Len Browncece9292006-06-26 23:04:31 -0400239 printk(KERN_WARNING PREFIX
Thomas Renningera6fc6722006-06-26 23:58:43 -0400240 "Cannot set device to a higher-powered"
Len Browncece9292006-06-26 23:04:31 -0400241 " state than parent\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400242 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
244
245 /*
246 * Transition Power
247 * ----------------
248 * On transitions to a high-powered state we first apply power (via
249 * power resources) then evalute _PSx. Conversly for transitions to
250 * a lower-powered state.
David Shaohua Lib9131002005-03-19 00:16:18 -0500251 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (state < device->power.state) {
253 if (device->power.flags.power_resources) {
254 result = acpi_power_transition(device, state);
255 if (result)
256 goto end;
257 }
258 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400259 status = acpi_evaluate_object(device->handle,
260 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (ACPI_FAILURE(status)) {
262 result = -ENODEV;
263 goto end;
264 }
265 }
Len Brown4be44fc2005-08-05 00:44:28 -0400266 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400268 status = acpi_evaluate_object(device->handle,
269 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (ACPI_FAILURE(status)) {
271 result = -ENODEV;
272 goto end;
273 }
274 }
275 if (device->power.flags.power_resources) {
276 result = acpi_power_transition(device, state);
277 if (result)
278 goto end;
279 }
280 }
281
Len Brown4be44fc2005-08-05 00:44:28 -0400282 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (result)
Len Browncece9292006-06-26 23:04:31 -0400284 printk(KERN_WARNING PREFIX
285 "Transitioning device [%s] to D%d\n",
286 device->pnp.bus_id, state);
Shaohua Li5e321322007-10-11 23:53:58 +0200287 else {
288 device->power.state = state;
Len Brown4be44fc2005-08-05 00:44:28 -0400289 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
290 "Device [%s] transitioned to D%d\n",
291 device->pnp.bus_id, state));
Shaohua Li5e321322007-10-11 23:53:58 +0200292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Patrick Mocheld550d982006-06-27 00:41:40 -0400294 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
Len Brown4be44fc2005-08-05 00:44:28 -0400296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297EXPORT_SYMBOL(acpi_bus_set_power);
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299/* --------------------------------------------------------------------------
300 Event Management
301 -------------------------------------------------------------------------- */
302
Len Brown14e04fb32007-08-23 15:20:26 -0400303#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304static DEFINE_SPINLOCK(acpi_bus_event_lock);
305
306LIST_HEAD(acpi_bus_event_list);
307DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
308
Len Brown4be44fc2005-08-05 00:44:28 -0400309extern int event_is_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400311int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400313 struct acpi_bus_event *event;
Len Brown4be44fc2005-08-05 00:44:28 -0400314 unsigned long flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 /* drop event on the floor if no one's listening */
317 if (!event_is_open)
Patrick Mocheld550d982006-06-27 00:41:40 -0400318 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
321 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400322 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400324 strcpy(event->device_class, device_class);
325 strcpy(event->bus_id, bus_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 event->type = type;
327 event->data = data;
328
329 spin_lock_irqsave(&acpi_bus_event_lock, flags);
330 list_add_tail(&event->node, &acpi_bus_event_list);
331 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
332
333 wake_up_interruptible(&acpi_bus_event_queue);
334
Patrick Mocheld550d982006-06-27 00:41:40 -0400335 return 0;
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400336
337}
338
339EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
340
341int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
342{
343 if (!device)
344 return -EINVAL;
345 return acpi_bus_generate_proc_event4(device->pnp.device_class,
346 device->pnp.bus_id, type, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
Len Brown4be44fc2005-08-05 00:44:28 -0400348
Len Brown14e04fb32007-08-23 15:20:26 -0400349EXPORT_SYMBOL(acpi_bus_generate_proc_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Len Brown4be44fc2005-08-05 00:44:28 -0400351int acpi_bus_receive_event(struct acpi_bus_event *event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Len Brown4be44fc2005-08-05 00:44:28 -0400353 unsigned long flags = 0;
354 struct acpi_bus_event *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 DECLARE_WAITQUEUE(wait, current);
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400360 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 if (list_empty(&acpi_bus_event_list)) {
363
364 set_current_state(TASK_INTERRUPTIBLE);
365 add_wait_queue(&acpi_bus_event_queue, &wait);
366
367 if (list_empty(&acpi_bus_event_list))
368 schedule();
369
370 remove_wait_queue(&acpi_bus_event_queue, &wait);
371 set_current_state(TASK_RUNNING);
372
373 if (signal_pending(current))
Patrick Mocheld550d982006-06-27 00:41:40 -0400374 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
376
377 spin_lock_irqsave(&acpi_bus_event_lock, flags);
Len Brown4be44fc2005-08-05 00:44:28 -0400378 entry =
379 list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (entry)
381 list_del(&entry->node);
382 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
383
384 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400385 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 memcpy(event, entry, sizeof(struct acpi_bus_event));
388
389 kfree(entry);
390
Patrick Mocheld550d982006-06-27 00:41:40 -0400391 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Len Brown4be44fc2005-08-05 00:44:28 -0400394EXPORT_SYMBOL(acpi_bus_receive_event);
Len Brown14e04fb32007-08-23 15:20:26 -0400395#endif /* CONFIG_ACPI_PROC_EVENT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397/* --------------------------------------------------------------------------
398 Notification Handling
399 -------------------------------------------------------------------------- */
400
401static int
Len Brown4be44fc2005-08-05 00:44:28 -0400402acpi_bus_check_device(struct acpi_device *device, int *status_changed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
Len Brown4be44fc2005-08-05 00:44:28 -0400404 acpi_status status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 struct acpi_device_status old_status;
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400409 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 if (status_changed)
412 *status_changed = 0;
413
414 old_status = device->status;
415
416 /*
417 * Make sure this device's parent is present before we go about
418 * messing with the device.
419 */
420 if (device->parent && !device->parent->status.present) {
421 device->status = device->parent->status;
422 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
423 if (status_changed)
424 *status_changed = 1;
425 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400426 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428
429 status = acpi_bus_get_status(device);
430 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400431 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400434 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 if (status_changed)
437 *status_changed = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 /*
440 * Device Insertion/Removal
441 */
442 if ((device->status.present) && !(old_status.present)) {
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
444 /* TBD: Handle device insertion */
Len Brown4be44fc2005-08-05 00:44:28 -0400445 } else if (!(device->status.present) && (old_status.present)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
447 /* TBD: Handle device removal */
448 }
449
Patrick Mocheld550d982006-06-27 00:41:40 -0400450 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451}
452
Len Brown4be44fc2005-08-05 00:44:28 -0400453static int acpi_bus_check_scope(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
Len Brown4be44fc2005-08-05 00:44:28 -0400455 int result = 0;
456 int status_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400460 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 /* Status Change? */
463 result = acpi_bus_check_device(device, &status_changed);
464 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400465 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 if (!status_changed)
Patrick Mocheld550d982006-06-27 00:41:40 -0400468 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 /*
471 * TBD: Enumerate child devices within this device's scope and
472 * run acpi_bus_check_device()'s on them.
473 */
474
Patrick Mocheld550d982006-06-27 00:41:40 -0400475 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476}
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478/**
479 * acpi_bus_notify
480 * ---------------
481 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
482 */
Len Brown4be44fc2005-08-05 00:44:28 -0400483static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
Len Brown4be44fc2005-08-05 00:44:28 -0400485 int result = 0;
486 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 if (acpi_bus_get_device(handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 switch (type) {
493
494 case ACPI_NOTIFY_BUS_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400495 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
496 "Received BUS CHECK notification for device [%s]\n",
497 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 result = acpi_bus_check_scope(device);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500499 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400501 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 */
503 break;
504
505 case ACPI_NOTIFY_DEVICE_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
507 "Received DEVICE CHECK notification for device [%s]\n",
508 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 result = acpi_bus_check_device(device, NULL);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500510 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400512 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 */
514 break;
515
516 case ACPI_NOTIFY_DEVICE_WAKE:
Len Brown4be44fc2005-08-05 00:44:28 -0400517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
518 "Received DEVICE WAKE notification for device [%s]\n",
519 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* TBD */
521 break;
522
523 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
525 "Received EJECT REQUEST notification for device [%s]\n",
526 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 /* TBD */
528 break;
529
530 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
Len Brown4be44fc2005-08-05 00:44:28 -0400531 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
532 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
533 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 /* TBD: Exactly what does 'light' mean? */
535 break;
536
537 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400538 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539 "Received FREQUENCY MISMATCH notification for device [%s]\n",
540 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 /* TBD */
542 break;
543
544 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546 "Received BUS MODE MISMATCH notification for device [%s]\n",
547 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 /* TBD */
549 break;
550
551 case ACPI_NOTIFY_POWER_FAULT:
Len Brown4be44fc2005-08-05 00:44:28 -0400552 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
553 "Received POWER FAULT notification for device [%s]\n",
554 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 /* TBD */
556 break;
557
558 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400559 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
560 "Received unknown/unsupported notification [%08x]\n",
561 type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 break;
563 }
564
Patrick Mocheld550d982006-06-27 00:41:40 -0400565 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
568/* --------------------------------------------------------------------------
569 Initialization/Cleanup
570 -------------------------------------------------------------------------- */
571
Len Brown4be44fc2005-08-05 00:44:28 -0400572static int __init acpi_bus_init_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
Len Brown4be44fc2005-08-05 00:44:28 -0400574 acpi_status status = AE_OK;
575 union acpi_object arg = { ACPI_TYPE_INTEGER };
576 struct acpi_object_list arg_list = { 1, &arg };
577 char *message = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500580 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 * Let the system know what interrupt model we are using by
582 * evaluating the \_PIC object, if exists.
583 */
584
585 switch (acpi_irq_model) {
586 case ACPI_IRQ_MODEL_PIC:
587 message = "PIC";
588 break;
589 case ACPI_IRQ_MODEL_IOAPIC:
590 message = "IOAPIC";
591 break;
592 case ACPI_IRQ_MODEL_IOSAPIC:
593 message = "IOSAPIC";
594 break;
John Keller3948ec92006-12-22 11:50:04 -0600595 case ACPI_IRQ_MODEL_PLATFORM:
596 message = "platform specific model";
597 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 default:
599 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400600 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 }
602
603 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
604
605 arg.integer.value = acpi_irq_model;
606
607 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
608 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400609 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400610 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 }
612
Patrick Mocheld550d982006-06-27 00:41:40 -0400613 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
615
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300616acpi_native_uint acpi_gbl_permanent_mmap;
617
618
Len Brown4be44fc2005-08-05 00:44:28 -0400619void __init acpi_early_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620{
Len Brown4be44fc2005-08-05 00:44:28 -0400621 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400624 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Bob Moore616861242006-03-17 16:44:00 -0500626 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 /* enable workarounds, unless strict ACPI spec. compliance */
629 if (!acpi_strict)
630 acpi_gbl_enable_interpreter_slack = TRUE;
631
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300632 acpi_gbl_permanent_mmap = 1;
633
634 status = acpi_reallocate_root_table();
635 if (ACPI_FAILURE(status)) {
636 printk(KERN_ERR PREFIX
637 "Unable to reallocate ACPI tables\n");
638 goto error0;
639 }
640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 status = acpi_initialize_subsystem();
642 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400643 printk(KERN_ERR PREFIX
644 "Unable to initialize the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 goto error0;
646 }
647
648 status = acpi_load_tables();
649 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400650 printk(KERN_ERR PREFIX
651 "Unable to load the System Description Tables\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 goto error0;
653 }
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#ifdef CONFIG_X86
656 if (!acpi_ioapic) {
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300657 extern u8 acpi_sci_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 /* compatible (0) means level (3) */
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300660 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
661 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
662 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 /* Set PIC-mode SCI trigger type */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300665 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300666 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 } else {
668 extern int acpi_sci_override_gsi;
669 /*
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300670 * now that acpi_gbl_FADT is initialized,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 * update it with result from INT_SRC_OVR parsing
672 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300673 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 }
675#endif
676
Len Brown4be44fc2005-08-05 00:44:28 -0400677 status =
678 acpi_enable_subsystem(~
679 (ACPI_NO_HARDWARE_INIT |
680 ACPI_NO_ACPI_ENABLE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (ACPI_FAILURE(status)) {
682 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
683 goto error0;
684 }
685
Patrick Mocheld550d982006-06-27 00:41:40 -0400686 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
Len Brown4be44fc2005-08-05 00:44:28 -0400688 error0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 disable_acpi();
Patrick Mocheld550d982006-06-27 00:41:40 -0400690 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691}
692
Len Brown4be44fc2005-08-05 00:44:28 -0400693static int __init acpi_bus_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Len Brown4be44fc2005-08-05 00:44:28 -0400695 int result = 0;
696 acpi_status status = AE_OK;
697 extern acpi_status acpi_os_initialize1(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 status = acpi_os_initialize1();
701
Len Brown4be44fc2005-08-05 00:44:28 -0400702 status =
703 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400705 printk(KERN_ERR PREFIX
706 "Unable to start the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 goto error1;
708 }
709
710 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400711 printk(KERN_ERR PREFIX
712 "Unable to initialize ACPI OS objects\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 goto error1;
714 }
715#ifdef CONFIG_ACPI_EC
716 /*
717 * ACPI 2.0 requires the EC driver to be loaded and work before
718 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
719 * is called).
720 *
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500721 * This is accomplished by looking for the ECDT table, and getting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 * the EC parameters out of that.
723 */
724 status = acpi_ec_ecdt_probe();
725 /* Ignore result. Not having an ECDT is not fatal. */
726#endif
727
728 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
729 if (ACPI_FAILURE(status)) {
730 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
731 goto error1;
732 }
733
734 printk(KERN_INFO PREFIX "Interpreter enabled\n");
735
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500736 /* Initialize sleep structures */
737 acpi_sleep_init();
738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 /*
740 * Get the system interrupt model and evaluate \_PIC.
741 */
742 result = acpi_bus_init_irq();
743 if (result)
744 goto error1;
745
746 /*
747 * Register the for all standard device notifications.
748 */
Len Brown4be44fc2005-08-05 00:44:28 -0400749 status =
750 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
751 &acpi_bus_notify, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400753 printk(KERN_ERR PREFIX
754 "Unable to register for device notifications\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 goto error1;
756 }
757
758 /*
759 * Create the top ACPI proc directory
760 */
761 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
762
Patrick Mocheld550d982006-06-27 00:41:40 -0400763 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 /* Mimic structured exception handling */
Len Brown4be44fc2005-08-05 00:44:28 -0400766 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 acpi_terminate();
Patrick Mocheld550d982006-06-27 00:41:40 -0400768 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
Greg Kroah-Hartman99e0d2f2007-11-02 16:19:59 -0700771struct kobject *acpi_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Len Brown4be44fc2005-08-05 00:44:28 -0400773static int __init acpi_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
Len Brown4be44fc2005-08-05 00:44:28 -0400775 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 if (acpi_disabled) {
779 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400780 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 }
782
Greg Kroah-Hartmanf62ed9e2007-11-05 13:16:15 -0800783 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
Greg Kroah-Hartman99e0d2f2007-11-02 16:19:59 -0700784 if (!acpi_kobj) {
785 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
786 acpi_kobj = NULL;
787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 result = acpi_bus_init();
790
791 if (!result) {
Len Brown9f9adec2007-12-13 17:38:03 -0500792 if (!(pm_flags & PM_APM))
793 pm_flags |= PM_ACPI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 else {
Len Brown4be44fc2005-08-05 00:44:28 -0400795 printk(KERN_INFO PREFIX
796 "APM is already active, exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 disable_acpi();
798 result = -ENODEV;
799 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 } else
801 disable_acpi();
802
Patrick Mocheld550d982006-06-27 00:41:40 -0400803 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804}
805
806subsys_initcall(acpi_init);