2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/init.h>
26 #include <linux/ioport.h>
27 #include <linux/list.h>
28 #include <linux/sched.h>
30 #include <linux/device.h>
31 #include <linux/proc_fs.h>
33 #include <asm/mpspec.h>
35 #include <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.h>
39 #define _COMPONENT ACPI_BUS_COMPONENT
40 ACPI_MODULE_NAME ("acpi_bus")
43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
46 FADT_DESCRIPTOR acpi_fadt;
47 struct acpi_device *acpi_root;
48 struct proc_dir_entry *acpi_root_dir;
50 #define STRUCT_TO_INT(s) (*((int*)&s))
52 /* --------------------------------------------------------------------------
54 -------------------------------------------------------------------------- */
56 extern void acpi_bus_data_handler (
63 struct acpi_device **device)
65 acpi_status status = AE_OK;
67 ACPI_FUNCTION_TRACE("acpi_bus_get_device");
70 return_VALUE(-EINVAL);
72 /* TBD: Support fixed-feature devices */
74 status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
75 if (ACPI_FAILURE(status) || !*device) {
76 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context for object [%p]\n",
78 return_VALUE(-ENODEV);
86 struct acpi_device *device)
88 acpi_status status = AE_OK;
89 unsigned long sta = 0;
91 ACPI_FUNCTION_TRACE("acpi_bus_get_status");
94 return_VALUE(-EINVAL);
97 * Evaluate _STA if present.
99 if (device->flags.dynamic_status) {
100 status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
101 if (ACPI_FAILURE(status))
102 return_VALUE(-ENODEV);
103 STRUCT_TO_INT(device->status) = (int) sta;
107 * Otherwise we assume the status of our parent (unless we don't
108 * have one, in which case status is implied).
110 else if (device->parent)
111 device->status = device->parent->status;
113 STRUCT_TO_INT(device->status) = 0x0F;
115 if (device->status.functional && !device->status.present) {
116 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
117 "functional but not present; setting present\n",
119 (u32) STRUCT_TO_INT(device->status));
120 device->status.present = 1;
123 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
124 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)));
130 /* --------------------------------------------------------------------------
132 -------------------------------------------------------------------------- */
140 acpi_status status = 0;
141 struct acpi_device *device = NULL;
142 unsigned long psc = 0;
144 ACPI_FUNCTION_TRACE("acpi_bus_get_power");
146 result = acpi_bus_get_device(handle, &device);
148 return_VALUE(result);
150 *state = ACPI_STATE_UNKNOWN;
152 if (!device->flags.power_manageable) {
153 /* TBD: Non-recursive algorithm for walking up hierarchy */
155 *state = device->parent->power.state;
157 *state = ACPI_STATE_D0;
161 * Get the device's power state either directly (via _PSC) or
162 * indirectly (via power resources).
164 if (device->power.flags.explicit_get) {
165 status = acpi_evaluate_integer(device->handle, "_PSC",
167 if (ACPI_FAILURE(status))
168 return_VALUE(-ENODEV);
169 device->power.state = (int) psc;
171 else if (device->power.flags.power_resources) {
172 result = acpi_power_get_inferred_state(device);
174 return_VALUE(result);
177 *state = device->power.state;
180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
181 device->pnp.bus_id, device->power.state));
193 acpi_status status = AE_OK;
194 struct acpi_device *device = NULL;
195 char object_name[5] = {'_','P','S','0'+state,'\0'};
197 ACPI_FUNCTION_TRACE("acpi_bus_set_power");
199 result = acpi_bus_get_device(handle, &device);
201 return_VALUE(result);
203 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
204 return_VALUE(-EINVAL);
206 /* Make sure this is a valid target state */
208 if (!device->flags.power_manageable) {
209 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
210 return_VALUE(-ENODEV);
212 if (state == device->power.state) {
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
216 if (!device->power.states[state].flags.valid) {
217 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state));
218 return_VALUE(-ENODEV);
220 if (device->parent && (state < device->parent->power.state)) {
221 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n"));
222 return_VALUE(-ENODEV);
228 * On transitions to a high-powered state we first apply power (via
229 * power resources) then evalute _PSx. Conversly for transitions to
230 * a lower-powered state.
232 if (state < device->power.state) {
233 if (device->power.flags.power_resources) {
234 result = acpi_power_transition(device, state);
238 if (device->power.states[state].flags.explicit_set) {
239 status = acpi_evaluate_object(device->handle,
240 object_name, NULL, NULL);
241 if (ACPI_FAILURE(status)) {
248 if (device->power.states[state].flags.explicit_set) {
249 status = acpi_evaluate_object(device->handle,
250 object_name, NULL, NULL);
251 if (ACPI_FAILURE(status)) {
256 if (device->power.flags.power_resources) {
257 result = acpi_power_transition(device, state);
265 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n",
266 device->pnp.bus_id, state));
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n",
269 device->pnp.bus_id, state));
271 return_VALUE(result);
276 /* --------------------------------------------------------------------------
278 -------------------------------------------------------------------------- */
280 static spinlock_t acpi_bus_event_lock = SPIN_LOCK_UNLOCKED;
282 LIST_HEAD(acpi_bus_event_list);
283 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
285 extern int event_is_open;
288 acpi_bus_generate_event (
289 struct acpi_device *device,
293 struct acpi_bus_event *event = NULL;
294 unsigned long flags = 0;
296 ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
299 return_VALUE(-EINVAL);
301 /* drop event on the floor if no one's listening */
305 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
307 return_VALUE(-ENOMEM);
309 strcpy(event->device_class, device->pnp.device_class);
310 strcpy(event->bus_id, device->pnp.bus_id);
314 spin_lock_irqsave(&acpi_bus_event_lock, flags);
315 list_add_tail(&event->node, &acpi_bus_event_list);
316 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
318 wake_up_interruptible(&acpi_bus_event_queue);
324 acpi_bus_receive_event (
325 struct acpi_bus_event *event)
327 unsigned long flags = 0;
328 struct acpi_bus_event *entry = NULL;
330 DECLARE_WAITQUEUE(wait, current);
332 ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
337 if (list_empty(&acpi_bus_event_list)) {
339 set_current_state(TASK_INTERRUPTIBLE);
340 add_wait_queue(&acpi_bus_event_queue, &wait);
342 if (list_empty(&acpi_bus_event_list))
345 remove_wait_queue(&acpi_bus_event_queue, &wait);
346 set_current_state(TASK_RUNNING);
348 if (signal_pending(current))
349 return_VALUE(-ERESTARTSYS);
352 spin_lock_irqsave(&acpi_bus_event_lock, flags);
353 entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
355 list_del(&entry->node);
356 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
359 return_VALUE(-ENODEV);
361 memcpy(event, entry, sizeof(struct acpi_bus_event));
369 /* --------------------------------------------------------------------------
370 Notification Handling
371 -------------------------------------------------------------------------- */
374 acpi_bus_check_device (
375 struct acpi_device *device,
378 acpi_status status = 0;
379 struct acpi_device_status old_status;
381 ACPI_FUNCTION_TRACE("acpi_bus_check_device");
384 return_VALUE(-EINVAL);
389 old_status = device->status;
392 * Make sure this device's parent is present before we go about
393 * messing with the device.
395 if (device->parent && !device->parent->status.present) {
396 device->status = device->parent->status;
397 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
404 status = acpi_bus_get_status(device);
405 if (ACPI_FAILURE(status))
406 return_VALUE(-ENODEV);
408 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
415 * Device Insertion/Removal
417 if ((device->status.present) && !(old_status.present)) {
418 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
419 /* TBD: Handle device insertion */
421 else if (!(device->status.present) && (old_status.present)) {
422 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
423 /* TBD: Handle device removal */
431 acpi_bus_check_scope (
432 struct acpi_device *device)
435 int status_changed = 0;
437 ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
440 return_VALUE(-EINVAL);
443 result = acpi_bus_check_device(device, &status_changed);
445 return_VALUE(result);
451 * TBD: Enumerate child devices within this device's scope and
452 * run acpi_bus_check_device()'s on them.
462 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
471 struct acpi_device *device = NULL;
473 ACPI_FUNCTION_TRACE("acpi_bus_notify");
475 if (acpi_bus_get_device(handle, &device))
480 case ACPI_NOTIFY_BUS_CHECK:
481 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n",
482 device->pnp.bus_id));
483 result = acpi_bus_check_scope(device);
485 * TBD: We'll need to outsource certain events to non-ACPI
486 * drivers via the device manager (device.c).
490 case ACPI_NOTIFY_DEVICE_CHECK:
491 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n",
492 device->pnp.bus_id));
493 result = acpi_bus_check_device(device, NULL);
495 * TBD: We'll need to outsource certain events to non-ACPI
496 * drivers via the device manager (device.c).
500 case ACPI_NOTIFY_DEVICE_WAKE:
501 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n",
502 device->pnp.bus_id));
506 case ACPI_NOTIFY_EJECT_REQUEST:
507 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n",
508 device->pnp.bus_id));
512 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
513 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n",
514 device->pnp.bus_id));
515 /* TBD: Exactly what does 'light' mean? */
518 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
519 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n",
520 device->pnp.bus_id));
524 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
525 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n",
526 device->pnp.bus_id));
530 case ACPI_NOTIFY_POWER_FAULT:
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n",
532 device->pnp.bus_id));
537 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n",
545 /* --------------------------------------------------------------------------
546 Initialization/Cleanup
547 -------------------------------------------------------------------------- */
550 acpi_bus_init_irq (void)
552 acpi_status status = AE_OK;
553 union acpi_object arg = {ACPI_TYPE_INTEGER};
554 struct acpi_object_list arg_list = {1, &arg};
555 char *message = NULL;
557 ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
560 * Let the system know what interrupt model we are using by
561 * evaluating the \_PIC object, if exists.
564 switch (acpi_irq_model) {
565 case ACPI_IRQ_MODEL_PIC:
568 case ACPI_IRQ_MODEL_IOAPIC:
571 case ACPI_IRQ_MODEL_IOSAPIC:
575 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
576 return_VALUE(-ENODEV);
579 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
581 arg.integer.value = acpi_irq_model;
583 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
584 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
585 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
586 return_VALUE(-ENODEV);
597 acpi_status status = AE_OK;
598 struct acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt};
600 ACPI_FUNCTION_TRACE("acpi_bus_init");
602 status = acpi_initialize_subsystem();
603 if (ACPI_FAILURE(status)) {
604 printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
608 status = acpi_load_tables();
609 if (ACPI_FAILURE(status)) {
610 printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
615 * Get a separate copy of the FADT for use by other drivers.
617 status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
618 if (ACPI_FAILURE(status)) {
619 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
625 extern acpi_interrupt_flags acpi_sci_flags;
627 /* compatible (0) means level (3) */
628 if (acpi_sci_flags.trigger == 0)
629 acpi_sci_flags.trigger = 3;
631 /* Set PIC-mode SCI trigger type */
632 acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
634 extern int acpi_sci_override_gsi;
636 * now that acpi_fadt is initialized,
637 * update it with result from INT_SRC_OVR parsing
639 acpi_fadt.sci_int = acpi_sci_override_gsi;
643 status = acpi_enable_subsystem(ACPI_FULL_INITIALIZATION);
644 if (ACPI_FAILURE(status)) {
645 printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
649 #ifdef CONFIG_ACPI_EC
651 * ACPI 2.0 requires the EC driver to be loaded and work before
652 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
655 * This is accomplished by looking for the ECDT table, and getting
656 * the EC parameters out of that.
658 status = acpi_ec_ecdt_probe();
659 /* Ignore result. Not having an ECDT is not fatal. */
662 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
663 if (ACPI_FAILURE(status)) {
664 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
668 printk(KERN_INFO PREFIX "Interpreter enabled\n");
671 * Get the system interrupt model and evaluate \_PIC.
673 result = acpi_bus_init_irq();
678 * Register the for all standard device notifications.
680 status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
681 if (ACPI_FAILURE(status)) {
682 printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
687 * Create the top ACPI proc directory
689 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
693 /* Mimic structured exception handling */
697 return_VALUE(-ENODEV);
700 decl_subsys(acpi,NULL,NULL);
702 static int __init acpi_init (void)
706 ACPI_FUNCTION_TRACE("acpi_init");
708 printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
711 /* Initial core debug level excludes drivers, so include them now */
712 acpi_set_debug(ACPI_DEBUG_LOW);
715 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
719 firmware_register(&acpi_subsys);
721 result = acpi_bus_init();
728 printk(KERN_INFO PREFIX "APM is already active, exiting\n");
736 return_VALUE(result);
739 subsys_initcall(acpi_init);