Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 5 | * |
| 6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or (at |
| 11 | * your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 21 | * |
| 22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 23 | */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/ioport.h> |
| 28 | #include <linux/list.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/pm.h> |
Jeff Garzik | bca73e4 | 2005-11-13 16:06:25 -0800 | [diff] [blame] | 31 | #include <linux/pm_legacy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #define _COMPONENT ACPI_BUS_COMPONENT |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 41 | ACPI_MODULE_NAME("acpi_bus") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #ifdef CONFIG_X86 |
| 43 | extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger); |
| 44 | #endif |
| 45 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame] | 46 | struct fadt_descriptor acpi_fadt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | EXPORT_SYMBOL(acpi_fadt); |
| 48 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 49 | struct acpi_device *acpi_root; |
| 50 | struct proc_dir_entry *acpi_root_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | EXPORT_SYMBOL(acpi_root_dir); |
| 52 | |
| 53 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
| 54 | |
| 55 | /* -------------------------------------------------------------------------- |
| 56 | Device Management |
| 57 | -------------------------------------------------------------------------- */ |
| 58 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 59 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 61 | acpi_status status = AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | ACPI_FUNCTION_TRACE("acpi_bus_get_device"); |
| 64 | |
| 65 | if (!device) |
| 66 | return_VALUE(-EINVAL); |
| 67 | |
| 68 | /* TBD: Support fixed-feature devices */ |
| 69 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | if (ACPI_FAILURE(status) || !*device) { |
| 72 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 73 | handle)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | return_VALUE(-ENODEV); |
| 75 | } |
| 76 | |
| 77 | return_VALUE(0); |
| 78 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | EXPORT_SYMBOL(acpi_bus_get_device); |
| 81 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 82 | int acpi_bus_get_status(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 84 | acpi_status status = AE_OK; |
| 85 | unsigned long sta = 0; |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | ACPI_FUNCTION_TRACE("acpi_bus_get_status"); |
| 88 | |
| 89 | if (!device) |
| 90 | return_VALUE(-EINVAL); |
| 91 | |
| 92 | /* |
| 93 | * Evaluate _STA if present. |
| 94 | */ |
| 95 | if (device->flags.dynamic_status) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 96 | status = |
| 97 | acpi_evaluate_integer(device->handle, "_STA", NULL, &sta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | if (ACPI_FAILURE(status)) |
| 99 | return_VALUE(-ENODEV); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 100 | STRUCT_TO_INT(device->status) = (int)sta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Otherwise we assume the status of our parent (unless we don't |
| 105 | * have one, in which case status is implied). |
| 106 | */ |
| 107 | else if (device->parent) |
| 108 | device->status = device->parent->status; |
| 109 | else |
| 110 | STRUCT_TO_INT(device->status) = 0x0F; |
| 111 | |
| 112 | if (device->status.functional && !device->status.present) { |
| 113 | printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: " |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 114 | "functional but not present; setting present\n", |
| 115 | device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | device->status.present = 1; |
| 117 | } |
| 118 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 119 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", |
| 120 | device->pnp.bus_id, |
| 121 | (u32) STRUCT_TO_INT(device->status))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | return_VALUE(0); |
| 124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 126 | EXPORT_SYMBOL(acpi_bus_get_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | /* -------------------------------------------------------------------------- |
| 129 | Power Management |
| 130 | -------------------------------------------------------------------------- */ |
| 131 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 132 | int acpi_bus_get_power(acpi_handle handle, int *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 134 | int result = 0; |
| 135 | acpi_status status = 0; |
| 136 | struct acpi_device *device = NULL; |
| 137 | unsigned long psc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | ACPI_FUNCTION_TRACE("acpi_bus_get_power"); |
| 140 | |
| 141 | result = acpi_bus_get_device(handle, &device); |
| 142 | if (result) |
| 143 | return_VALUE(result); |
| 144 | |
| 145 | *state = ACPI_STATE_UNKNOWN; |
| 146 | |
| 147 | if (!device->flags.power_manageable) { |
| 148 | /* TBD: Non-recursive algorithm for walking up hierarchy */ |
| 149 | if (device->parent) |
| 150 | *state = device->parent->power.state; |
| 151 | else |
| 152 | *state = ACPI_STATE_D0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 153 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* |
| 155 | * Get the device's power state either directly (via _PSC) or |
| 156 | * indirectly (via power resources). |
| 157 | */ |
| 158 | if (device->power.flags.explicit_get) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | status = acpi_evaluate_integer(device->handle, "_PSC", |
| 160 | NULL, &psc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | if (ACPI_FAILURE(status)) |
| 162 | return_VALUE(-ENODEV); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 163 | device->power.state = (int)psc; |
| 164 | } else if (device->power.flags.power_resources) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | result = acpi_power_get_inferred_state(device); |
| 166 | if (result) |
| 167 | return_VALUE(result); |
| 168 | } |
| 169 | |
| 170 | *state = device->power.state; |
| 171 | } |
| 172 | |
| 173 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 174 | device->pnp.bus_id, device->power.state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
| 176 | return_VALUE(0); |
| 177 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | EXPORT_SYMBOL(acpi_bus_get_power); |
| 180 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 181 | int acpi_bus_set_power(acpi_handle handle, int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 183 | int result = 0; |
| 184 | acpi_status status = AE_OK; |
| 185 | struct acpi_device *device = NULL; |
| 186 | char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | ACPI_FUNCTION_TRACE("acpi_bus_set_power"); |
| 189 | |
| 190 | result = acpi_bus_get_device(handle, &device); |
| 191 | if (result) |
| 192 | return_VALUE(result); |
| 193 | |
| 194 | if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) |
| 195 | return_VALUE(-EINVAL); |
| 196 | |
| 197 | /* Make sure this is a valid target state */ |
| 198 | |
| 199 | if (!device->flags.power_manageable) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 201 | "Device is not power manageable\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return_VALUE(-ENODEV); |
| 203 | } |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 204 | /* |
| 205 | * Get device's current power state if it's unknown |
| 206 | * This means device power state isn't initialized or previous setting failed |
| 207 | */ |
| 208 | if (device->power.state == ACPI_STATE_UNKNOWN) |
| 209 | acpi_bus_get_power(device->handle, &device->power.state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | if (state == device->power.state) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 211 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", |
| 212 | state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return_VALUE(0); |
| 214 | } |
| 215 | if (!device->power.states[state].flags.valid) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 216 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", |
| 217 | state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return_VALUE(-ENODEV); |
| 219 | } |
| 220 | if (device->parent && (state < device->parent->power.state)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 221 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 222 | "Cannot set device to a higher-powered state than parent\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | return_VALUE(-ENODEV); |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Transition Power |
| 228 | * ---------------- |
| 229 | * On transitions to a high-powered state we first apply power (via |
| 230 | * power resources) then evalute _PSx. Conversly for transitions to |
| 231 | * a lower-powered state. |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 232 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | if (state < device->power.state) { |
| 234 | if (device->power.flags.power_resources) { |
| 235 | result = acpi_power_transition(device, state); |
| 236 | if (result) |
| 237 | goto end; |
| 238 | } |
| 239 | if (device->power.states[state].flags.explicit_set) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 240 | status = acpi_evaluate_object(device->handle, |
| 241 | object_name, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | if (ACPI_FAILURE(status)) { |
| 243 | result = -ENODEV; |
| 244 | goto end; |
| 245 | } |
| 246 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 247 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (device->power.states[state].flags.explicit_set) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 249 | status = acpi_evaluate_object(device->handle, |
| 250 | object_name, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (ACPI_FAILURE(status)) { |
| 252 | result = -ENODEV; |
| 253 | goto end; |
| 254 | } |
| 255 | } |
| 256 | if (device->power.flags.power_resources) { |
| 257 | result = acpi_power_transition(device, state); |
| 258 | if (result) |
| 259 | goto end; |
| 260 | } |
| 261 | } |
| 262 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 263 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (result) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 265 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 266 | "Error transitioning device [%s] to D%d\n", |
| 267 | device->pnp.bus_id, state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | else |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 269 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 270 | "Device [%s] transitioned to D%d\n", |
| 271 | device->pnp.bus_id, state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | return_VALUE(result); |
| 274 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | EXPORT_SYMBOL(acpi_bus_set_power); |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | /* -------------------------------------------------------------------------- |
| 279 | Event Management |
| 280 | -------------------------------------------------------------------------- */ |
| 281 | |
| 282 | static DEFINE_SPINLOCK(acpi_bus_event_lock); |
| 283 | |
| 284 | LIST_HEAD(acpi_bus_event_list); |
| 285 | DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); |
| 286 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | extern int event_is_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 289 | int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 291 | struct acpi_bus_event *event = NULL; |
| 292 | unsigned long flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | ACPI_FUNCTION_TRACE("acpi_bus_generate_event"); |
| 295 | |
| 296 | if (!device) |
| 297 | return_VALUE(-EINVAL); |
| 298 | |
| 299 | /* drop event on the floor if no one's listening */ |
| 300 | if (!event_is_open) |
| 301 | return_VALUE(0); |
| 302 | |
| 303 | event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); |
| 304 | if (!event) |
| 305 | return_VALUE(-ENOMEM); |
| 306 | |
| 307 | strcpy(event->device_class, device->pnp.device_class); |
| 308 | strcpy(event->bus_id, device->pnp.bus_id); |
| 309 | event->type = type; |
| 310 | event->data = data; |
| 311 | |
| 312 | spin_lock_irqsave(&acpi_bus_event_lock, flags); |
| 313 | list_add_tail(&event->node, &acpi_bus_event_list); |
| 314 | spin_unlock_irqrestore(&acpi_bus_event_lock, flags); |
| 315 | |
| 316 | wake_up_interruptible(&acpi_bus_event_queue); |
| 317 | |
| 318 | return_VALUE(0); |
| 319 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | EXPORT_SYMBOL(acpi_bus_generate_event); |
| 322 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 323 | int acpi_bus_receive_event(struct acpi_bus_event *event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 325 | unsigned long flags = 0; |
| 326 | struct acpi_bus_event *entry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | DECLARE_WAITQUEUE(wait, current); |
| 329 | |
| 330 | ACPI_FUNCTION_TRACE("acpi_bus_receive_event"); |
| 331 | |
| 332 | if (!event) |
| 333 | return_VALUE(-EINVAL); |
| 334 | |
| 335 | if (list_empty(&acpi_bus_event_list)) { |
| 336 | |
| 337 | set_current_state(TASK_INTERRUPTIBLE); |
| 338 | add_wait_queue(&acpi_bus_event_queue, &wait); |
| 339 | |
| 340 | if (list_empty(&acpi_bus_event_list)) |
| 341 | schedule(); |
| 342 | |
| 343 | remove_wait_queue(&acpi_bus_event_queue, &wait); |
| 344 | set_current_state(TASK_RUNNING); |
| 345 | |
| 346 | if (signal_pending(current)) |
| 347 | return_VALUE(-ERESTARTSYS); |
| 348 | } |
| 349 | |
| 350 | spin_lock_irqsave(&acpi_bus_event_lock, flags); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 351 | entry = |
| 352 | list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | if (entry) |
| 354 | list_del(&entry->node); |
| 355 | spin_unlock_irqrestore(&acpi_bus_event_lock, flags); |
| 356 | |
| 357 | if (!entry) |
| 358 | return_VALUE(-ENODEV); |
| 359 | |
| 360 | memcpy(event, entry, sizeof(struct acpi_bus_event)); |
| 361 | |
| 362 | kfree(entry); |
| 363 | |
| 364 | return_VALUE(0); |
| 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 367 | EXPORT_SYMBOL(acpi_bus_receive_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | /* -------------------------------------------------------------------------- |
| 370 | Notification Handling |
| 371 | -------------------------------------------------------------------------- */ |
| 372 | |
| 373 | static int |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 374 | acpi_bus_check_device(struct acpi_device *device, int *status_changed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 376 | acpi_status status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | struct acpi_device_status old_status; |
| 378 | |
| 379 | ACPI_FUNCTION_TRACE("acpi_bus_check_device"); |
| 380 | |
| 381 | if (!device) |
| 382 | return_VALUE(-EINVAL); |
| 383 | |
| 384 | if (status_changed) |
| 385 | *status_changed = 0; |
| 386 | |
| 387 | old_status = device->status; |
| 388 | |
| 389 | /* |
| 390 | * Make sure this device's parent is present before we go about |
| 391 | * messing with the device. |
| 392 | */ |
| 393 | if (device->parent && !device->parent->status.present) { |
| 394 | device->status = device->parent->status; |
| 395 | if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) { |
| 396 | if (status_changed) |
| 397 | *status_changed = 1; |
| 398 | } |
| 399 | return_VALUE(0); |
| 400 | } |
| 401 | |
| 402 | status = acpi_bus_get_status(device); |
| 403 | if (ACPI_FAILURE(status)) |
| 404 | return_VALUE(-ENODEV); |
| 405 | |
| 406 | if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) |
| 407 | return_VALUE(0); |
| 408 | |
| 409 | if (status_changed) |
| 410 | *status_changed = 1; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | /* |
| 413 | * Device Insertion/Removal |
| 414 | */ |
| 415 | if ((device->status.present) && !(old_status.present)) { |
| 416 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); |
| 417 | /* TBD: Handle device insertion */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 418 | } else if (!(device->status.present) && (old_status.present)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); |
| 420 | /* TBD: Handle device removal */ |
| 421 | } |
| 422 | |
| 423 | return_VALUE(0); |
| 424 | } |
| 425 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 426 | static int acpi_bus_check_scope(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 428 | int result = 0; |
| 429 | int status_changed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | ACPI_FUNCTION_TRACE("acpi_bus_check_scope"); |
| 432 | |
| 433 | if (!device) |
| 434 | return_VALUE(-EINVAL); |
| 435 | |
| 436 | /* Status Change? */ |
| 437 | result = acpi_bus_check_device(device, &status_changed); |
| 438 | if (result) |
| 439 | return_VALUE(result); |
| 440 | |
| 441 | if (!status_changed) |
| 442 | return_VALUE(0); |
| 443 | |
| 444 | /* |
| 445 | * TBD: Enumerate child devices within this device's scope and |
| 446 | * run acpi_bus_check_device()'s on them. |
| 447 | */ |
| 448 | |
| 449 | return_VALUE(0); |
| 450 | } |
| 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | /** |
| 453 | * acpi_bus_notify |
| 454 | * --------------- |
| 455 | * Callback for all 'system-level' device notifications (values 0x00-0x7F). |
| 456 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 457 | static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 459 | int result = 0; |
| 460 | struct acpi_device *device = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | ACPI_FUNCTION_TRACE("acpi_bus_notify"); |
| 463 | |
| 464 | if (acpi_bus_get_device(handle, &device)) |
| 465 | return_VOID; |
| 466 | |
| 467 | switch (type) { |
| 468 | |
| 469 | case ACPI_NOTIFY_BUS_CHECK: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 470 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 471 | "Received BUS CHECK notification for device [%s]\n", |
| 472 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | result = acpi_bus_check_scope(device); |
| 474 | /* |
| 475 | * TBD: We'll need to outsource certain events to non-ACPI |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 476 | * drivers via the device manager (device.c). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | */ |
| 478 | break; |
| 479 | |
| 480 | case ACPI_NOTIFY_DEVICE_CHECK: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 481 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 482 | "Received DEVICE CHECK notification for device [%s]\n", |
| 483 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | result = acpi_bus_check_device(device, NULL); |
| 485 | /* |
| 486 | * TBD: We'll need to outsource certain events to non-ACPI |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 487 | * drivers via the device manager (device.c). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | */ |
| 489 | break; |
| 490 | |
| 491 | case ACPI_NOTIFY_DEVICE_WAKE: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 492 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 493 | "Received DEVICE WAKE notification for device [%s]\n", |
| 494 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* TBD */ |
| 496 | break; |
| 497 | |
| 498 | case ACPI_NOTIFY_EJECT_REQUEST: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 499 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 500 | "Received EJECT REQUEST notification for device [%s]\n", |
| 501 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* TBD */ |
| 503 | break; |
| 504 | |
| 505 | case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 506 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 507 | "Received DEVICE CHECK LIGHT notification for device [%s]\n", |
| 508 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* TBD: Exactly what does 'light' mean? */ |
| 510 | break; |
| 511 | |
| 512 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 513 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 514 | "Received FREQUENCY MISMATCH notification for device [%s]\n", |
| 515 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | /* TBD */ |
| 517 | break; |
| 518 | |
| 519 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 520 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 521 | "Received BUS MODE MISMATCH notification for device [%s]\n", |
| 522 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | /* TBD */ |
| 524 | break; |
| 525 | |
| 526 | case ACPI_NOTIFY_POWER_FAULT: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 527 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 528 | "Received POWER FAULT notification for device [%s]\n", |
| 529 | device->pnp.bus_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | /* TBD */ |
| 531 | break; |
| 532 | |
| 533 | default: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 534 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 535 | "Received unknown/unsupported notification [%08x]\n", |
| 536 | type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | break; |
| 538 | } |
| 539 | |
| 540 | return_VOID; |
| 541 | } |
| 542 | |
| 543 | /* -------------------------------------------------------------------------- |
| 544 | Initialization/Cleanup |
| 545 | -------------------------------------------------------------------------- */ |
| 546 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 547 | static int __init acpi_bus_init_irq(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 549 | acpi_status status = AE_OK; |
| 550 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
| 551 | struct acpi_object_list arg_list = { 1, &arg }; |
| 552 | char *message = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | ACPI_FUNCTION_TRACE("acpi_bus_init_irq"); |
| 555 | |
| 556 | /* |
| 557 | * Let the system know what interrupt model we are using by |
| 558 | * evaluating the \_PIC object, if exists. |
| 559 | */ |
| 560 | |
| 561 | switch (acpi_irq_model) { |
| 562 | case ACPI_IRQ_MODEL_PIC: |
| 563 | message = "PIC"; |
| 564 | break; |
| 565 | case ACPI_IRQ_MODEL_IOAPIC: |
| 566 | message = "IOAPIC"; |
| 567 | break; |
| 568 | case ACPI_IRQ_MODEL_IOSAPIC: |
| 569 | message = "IOSAPIC"; |
| 570 | break; |
| 571 | default: |
| 572 | printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); |
| 573 | return_VALUE(-ENODEV); |
| 574 | } |
| 575 | |
| 576 | printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); |
| 577 | |
| 578 | arg.integer.value = acpi_irq_model; |
| 579 | |
| 580 | status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); |
| 581 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
| 582 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n")); |
| 583 | return_VALUE(-ENODEV); |
| 584 | } |
| 585 | |
| 586 | return_VALUE(0); |
| 587 | } |
| 588 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 589 | void __init acpi_early_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 591 | acpi_status status = AE_OK; |
| 592 | struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | ACPI_FUNCTION_TRACE("acpi_early_init"); |
| 595 | |
| 596 | if (acpi_disabled) |
| 597 | return_VOID; |
| 598 | |
Bob Moore | 61686124 | 2006-03-17 16:44:00 -0500 | [diff] [blame] | 599 | printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); |
| 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | /* enable workarounds, unless strict ACPI spec. compliance */ |
| 602 | if (!acpi_strict) |
| 603 | acpi_gbl_enable_interpreter_slack = TRUE; |
| 604 | |
| 605 | status = acpi_initialize_subsystem(); |
| 606 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 607 | printk(KERN_ERR PREFIX |
| 608 | "Unable to initialize the ACPI Interpreter\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | goto error0; |
| 610 | } |
| 611 | |
| 612 | status = acpi_load_tables(); |
| 613 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 614 | printk(KERN_ERR PREFIX |
| 615 | "Unable to load the System Description Tables\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | goto error0; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Get a separate copy of the FADT for use by other drivers. |
| 621 | */ |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 622 | status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | if (ACPI_FAILURE(status)) { |
| 624 | printk(KERN_ERR PREFIX "Unable to get the FADT\n"); |
| 625 | goto error0; |
| 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | #ifdef CONFIG_X86 |
| 628 | if (!acpi_ioapic) { |
| 629 | extern acpi_interrupt_flags acpi_sci_flags; |
| 630 | |
| 631 | /* compatible (0) means level (3) */ |
| 632 | if (acpi_sci_flags.trigger == 0) |
| 633 | acpi_sci_flags.trigger = 3; |
| 634 | |
| 635 | /* Set PIC-mode SCI trigger type */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 636 | acpi_pic_sci_set_trigger(acpi_fadt.sci_int, |
| 637 | acpi_sci_flags.trigger); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } else { |
| 639 | extern int acpi_sci_override_gsi; |
| 640 | /* |
| 641 | * now that acpi_fadt is initialized, |
| 642 | * update it with result from INT_SRC_OVR parsing |
| 643 | */ |
| 644 | acpi_fadt.sci_int = acpi_sci_override_gsi; |
| 645 | } |
| 646 | #endif |
| 647 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 648 | status = |
| 649 | acpi_enable_subsystem(~ |
| 650 | (ACPI_NO_HARDWARE_INIT | |
| 651 | ACPI_NO_ACPI_ENABLE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (ACPI_FAILURE(status)) { |
| 653 | printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); |
| 654 | goto error0; |
| 655 | } |
| 656 | |
| 657 | return_VOID; |
| 658 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 659 | error0: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | disable_acpi(); |
| 661 | return_VOID; |
| 662 | } |
| 663 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 664 | static int __init acpi_bus_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 666 | int result = 0; |
| 667 | acpi_status status = AE_OK; |
| 668 | extern acpi_status acpi_os_initialize1(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
| 670 | ACPI_FUNCTION_TRACE("acpi_bus_init"); |
| 671 | |
| 672 | status = acpi_os_initialize1(); |
| 673 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 674 | status = |
| 675 | acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 677 | printk(KERN_ERR PREFIX |
| 678 | "Unable to start the ACPI Interpreter\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | goto error1; |
| 680 | } |
| 681 | |
| 682 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 683 | printk(KERN_ERR PREFIX |
| 684 | "Unable to initialize ACPI OS objects\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | goto error1; |
| 686 | } |
| 687 | #ifdef CONFIG_ACPI_EC |
| 688 | /* |
| 689 | * ACPI 2.0 requires the EC driver to be loaded and work before |
| 690 | * the EC device is found in the namespace (i.e. before acpi_initialize_objects() |
| 691 | * is called). |
| 692 | * |
| 693 | * This is accomplished by looking for the ECDT table, and getting |
| 694 | * the EC parameters out of that. |
| 695 | */ |
| 696 | status = acpi_ec_ecdt_probe(); |
| 697 | /* Ignore result. Not having an ECDT is not fatal. */ |
| 698 | #endif |
| 699 | |
| 700 | status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); |
| 701 | if (ACPI_FAILURE(status)) { |
| 702 | printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); |
| 703 | goto error1; |
| 704 | } |
| 705 | |
| 706 | printk(KERN_INFO PREFIX "Interpreter enabled\n"); |
| 707 | |
| 708 | /* |
| 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 Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 718 | status = |
| 719 | acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, |
| 720 | &acpi_bus_notify, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 722 | printk(KERN_ERR PREFIX |
| 723 | "Unable to register for device notifications\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | 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 | |
| 732 | return_VALUE(0); |
| 733 | |
| 734 | /* Mimic structured exception handling */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 735 | error1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | acpi_terminate(); |
| 737 | return_VALUE(-ENODEV); |
| 738 | } |
| 739 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 740 | decl_subsys(acpi, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 742 | static int __init acpi_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 744 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | ACPI_FUNCTION_TRACE("acpi_init"); |
| 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | if (acpi_disabled) { |
| 749 | printk(KERN_INFO PREFIX "Interpreter disabled.\n"); |
| 750 | return_VALUE(-ENODEV); |
| 751 | } |
| 752 | |
| 753 | firmware_register(&acpi_subsys); |
| 754 | |
| 755 | result = acpi_bus_init(); |
| 756 | |
| 757 | if (!result) { |
Jeff Garzik | bca73e4 | 2005-11-13 16:06:25 -0800 | [diff] [blame] | 758 | #ifdef CONFIG_PM_LEGACY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if (!PM_IS_ACTIVE()) |
| 760 | pm_active = 1; |
| 761 | else { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 762 | printk(KERN_INFO PREFIX |
| 763 | "APM is already active, exiting\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | disable_acpi(); |
| 765 | result = -ENODEV; |
| 766 | } |
| 767 | #endif |
| 768 | } else |
| 769 | disable_acpi(); |
| 770 | |
| 771 | return_VALUE(result); |
| 772 | } |
| 773 | |
| 774 | subsys_initcall(acpi_init); |