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/module.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
35 #include <asm/mpspec.h>
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
40 #define _COMPONENT ACPI_BUS_COMPONENT
41 ACPI_MODULE_NAME("bus");
43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
46 struct acpi_device *acpi_root;
47 struct proc_dir_entry *acpi_root_dir;
48 EXPORT_SYMBOL(acpi_root_dir);
50 #define STRUCT_TO_INT(s) (*((int*)&s))
52 /* --------------------------------------------------------------------------
54 -------------------------------------------------------------------------- */
56 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
58 acpi_status status = AE_OK;
64 /* TBD: Support fixed-feature devices */
66 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
67 if (ACPI_FAILURE(status) || !*device) {
68 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
76 EXPORT_SYMBOL(acpi_bus_get_device);
78 int acpi_bus_get_status(struct acpi_device *device)
80 acpi_status status = AE_OK;
81 unsigned long sta = 0;
88 * Evaluate _STA if present.
90 if (device->flags.dynamic_status) {
92 acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
93 if (ACPI_FAILURE(status))
95 STRUCT_TO_INT(device->status) = (int)sta;
99 * Otherwise we assume the status of our parent (unless we don't
100 * have one, in which case status is implied).
102 else if (device->parent)
103 device->status = device->parent->status;
105 STRUCT_TO_INT(device->status) =
106 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
107 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
109 if (device->status.functional && !device->status.present) {
110 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
111 "functional but not present; setting present\n",
112 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
113 device->status.present = 1;
116 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
118 (u32) STRUCT_TO_INT(device->status)));
123 EXPORT_SYMBOL(acpi_bus_get_status);
125 void acpi_bus_private_data_handler(acpi_handle handle,
126 u32 function, void *context)
130 EXPORT_SYMBOL(acpi_bus_private_data_handler);
132 int acpi_bus_get_private_data(acpi_handle handle, void **data)
134 acpi_status status = AE_OK;
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",
148 EXPORT_SYMBOL(acpi_bus_get_private_data);
150 /* --------------------------------------------------------------------------
152 -------------------------------------------------------------------------- */
154 int acpi_bus_get_power(acpi_handle handle, int *state)
157 acpi_status status = 0;
158 struct acpi_device *device = NULL;
159 unsigned long psc = 0;
162 result = acpi_bus_get_device(handle, &device);
166 *state = ACPI_STATE_UNKNOWN;
168 if (!device->flags.power_manageable) {
169 /* TBD: Non-recursive algorithm for walking up hierarchy */
171 *state = device->parent->power.state;
173 *state = ACPI_STATE_D0;
176 * Get the device's power state either directly (via _PSC) or
177 * indirectly (via power resources).
179 if (device->power.flags.explicit_get) {
180 status = acpi_evaluate_integer(device->handle, "_PSC",
182 if (ACPI_FAILURE(status))
184 device->power.state = (int)psc;
185 } else if (device->power.flags.power_resources) {
186 result = acpi_power_get_inferred_state(device);
191 *state = device->power.state;
194 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
195 device->pnp.bus_id, device->power.state));
200 EXPORT_SYMBOL(acpi_bus_get_power);
202 int acpi_bus_set_power(acpi_handle handle, int state)
205 acpi_status status = AE_OK;
206 struct acpi_device *device = NULL;
207 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
210 result = acpi_bus_get_device(handle, &device);
214 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
217 /* Make sure this is a valid target state */
219 if (!device->flags.power_manageable) {
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
221 kobject_name(&device->dev.kobj)));
225 * Get device's current power state
227 acpi_bus_get_power(device->handle, &device->power.state);
228 if ((state == device->power.state) && !device->flags.force_power_state) {
229 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
234 if (!device->power.states[state].flags.valid) {
235 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
238 if (device->parent && (state < device->parent->power.state)) {
239 printk(KERN_WARNING PREFIX
240 "Cannot set device to a higher-powered"
241 " state than parent\n");
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.
252 if (state < device->power.state) {
253 if (device->power.flags.power_resources) {
254 result = acpi_power_transition(device, state);
258 if (device->power.states[state].flags.explicit_set) {
259 status = acpi_evaluate_object(device->handle,
260 object_name, NULL, NULL);
261 if (ACPI_FAILURE(status)) {
267 if (device->power.states[state].flags.explicit_set) {
268 status = acpi_evaluate_object(device->handle,
269 object_name, NULL, NULL);
270 if (ACPI_FAILURE(status)) {
275 if (device->power.flags.power_resources) {
276 result = acpi_power_transition(device, state);
284 printk(KERN_WARNING PREFIX
285 "Transitioning device [%s] to D%d\n",
286 device->pnp.bus_id, state);
288 device->power.state = state;
289 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
290 "Device [%s] transitioned to D%d\n",
291 device->pnp.bus_id, state));
297 EXPORT_SYMBOL(acpi_bus_set_power);
299 /* --------------------------------------------------------------------------
301 -------------------------------------------------------------------------- */
303 #ifdef CONFIG_ACPI_PROC_EVENT
304 static DEFINE_SPINLOCK(acpi_bus_event_lock);
306 LIST_HEAD(acpi_bus_event_list);
307 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
309 extern int event_is_open;
311 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
313 struct acpi_bus_event *event;
314 unsigned long flags = 0;
316 /* drop event on the floor if no one's listening */
320 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
324 strcpy(event->device_class, device_class);
325 strcpy(event->bus_id, bus_id);
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);
333 wake_up_interruptible(&acpi_bus_event_queue);
339 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
341 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
345 return acpi_bus_generate_proc_event4(device->pnp.device_class,
346 device->pnp.bus_id, type, data);
349 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
351 int acpi_bus_receive_event(struct acpi_bus_event *event)
353 unsigned long flags = 0;
354 struct acpi_bus_event *entry = NULL;
356 DECLARE_WAITQUEUE(wait, current);
362 if (list_empty(&acpi_bus_event_list)) {
364 set_current_state(TASK_INTERRUPTIBLE);
365 add_wait_queue(&acpi_bus_event_queue, &wait);
367 if (list_empty(&acpi_bus_event_list))
370 remove_wait_queue(&acpi_bus_event_queue, &wait);
371 set_current_state(TASK_RUNNING);
373 if (signal_pending(current))
377 spin_lock_irqsave(&acpi_bus_event_lock, flags);
379 list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
381 list_del(&entry->node);
382 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
387 memcpy(event, entry, sizeof(struct acpi_bus_event));
394 EXPORT_SYMBOL(acpi_bus_receive_event);
395 #endif /* CONFIG_ACPI_PROC_EVENT */
397 /* --------------------------------------------------------------------------
398 Notification Handling
399 -------------------------------------------------------------------------- */
402 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
404 acpi_status status = 0;
405 struct acpi_device_status old_status;
414 old_status = device->status;
417 * Make sure this device's parent is present before we go about
418 * messing with the device.
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)) {
429 status = acpi_bus_get_status(device);
430 if (ACPI_FAILURE(status))
433 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
440 * Device Insertion/Removal
442 if ((device->status.present) && !(old_status.present)) {
443 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
444 /* TBD: Handle device insertion */
445 } else if (!(device->status.present) && (old_status.present)) {
446 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
447 /* TBD: Handle device removal */
453 static int acpi_bus_check_scope(struct acpi_device *device)
456 int status_changed = 0;
463 result = acpi_bus_check_device(device, &status_changed);
471 * TBD: Enumerate child devices within this device's scope and
472 * run acpi_bus_check_device()'s on them.
481 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
483 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
486 struct acpi_device *device = NULL;
489 if (acpi_bus_get_device(handle, &device))
494 case ACPI_NOTIFY_BUS_CHECK:
495 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
496 "Received BUS CHECK notification for device [%s]\n",
497 device->pnp.bus_id));
498 result = acpi_bus_check_scope(device);
500 * TBD: We'll need to outsource certain events to non-ACPI
501 * drivers via the device manager (device.c).
505 case ACPI_NOTIFY_DEVICE_CHECK:
506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
507 "Received DEVICE CHECK notification for device [%s]\n",
508 device->pnp.bus_id));
509 result = acpi_bus_check_device(device, NULL);
511 * TBD: We'll need to outsource certain events to non-ACPI
512 * drivers via the device manager (device.c).
516 case ACPI_NOTIFY_DEVICE_WAKE:
517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
518 "Received DEVICE WAKE notification for device [%s]\n",
519 device->pnp.bus_id));
523 case ACPI_NOTIFY_EJECT_REQUEST:
524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
525 "Received EJECT REQUEST notification for device [%s]\n",
526 device->pnp.bus_id));
530 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
532 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
533 device->pnp.bus_id));
534 /* TBD: Exactly what does 'light' mean? */
537 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
538 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
539 "Received FREQUENCY MISMATCH notification for device [%s]\n",
540 device->pnp.bus_id));
544 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546 "Received BUS MODE MISMATCH notification for device [%s]\n",
547 device->pnp.bus_id));
551 case ACPI_NOTIFY_POWER_FAULT:
552 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
553 "Received POWER FAULT notification for device [%s]\n",
554 device->pnp.bus_id));
559 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
560 "Received unknown/unsupported notification [%08x]\n",
568 /* --------------------------------------------------------------------------
569 Initialization/Cleanup
570 -------------------------------------------------------------------------- */
572 static int __init acpi_bus_init_irq(void)
574 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;
581 * Let the system know what interrupt model we are using by
582 * evaluating the \_PIC object, if exists.
585 switch (acpi_irq_model) {
586 case ACPI_IRQ_MODEL_PIC:
589 case ACPI_IRQ_MODEL_IOAPIC:
592 case ACPI_IRQ_MODEL_IOSAPIC:
595 case ACPI_IRQ_MODEL_PLATFORM:
596 message = "platform specific model";
599 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
603 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
605 arg.integer.value = acpi_irq_model;
607 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
608 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
609 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
616 acpi_native_uint acpi_gbl_permanent_mmap;
619 void __init acpi_early_init(void)
621 acpi_status status = AE_OK;
626 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
628 /* enable workarounds, unless strict ACPI spec. compliance */
630 acpi_gbl_enable_interpreter_slack = TRUE;
632 acpi_gbl_permanent_mmap = 1;
634 status = acpi_reallocate_root_table();
635 if (ACPI_FAILURE(status)) {
636 printk(KERN_ERR PREFIX
637 "Unable to reallocate ACPI tables\n");
641 status = acpi_initialize_subsystem();
642 if (ACPI_FAILURE(status)) {
643 printk(KERN_ERR PREFIX
644 "Unable to initialize the ACPI Interpreter\n");
648 status = acpi_load_tables();
649 if (ACPI_FAILURE(status)) {
650 printk(KERN_ERR PREFIX
651 "Unable to load the System Description Tables\n");
657 extern u8 acpi_sci_flags;
659 /* compatible (0) means level (3) */
660 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
661 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
662 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
664 /* Set PIC-mode SCI trigger type */
665 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
666 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
668 extern int acpi_sci_override_gsi;
670 * now that acpi_gbl_FADT is initialized,
671 * update it with result from INT_SRC_OVR parsing
673 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
678 acpi_enable_subsystem(~
679 (ACPI_NO_HARDWARE_INIT |
680 ACPI_NO_ACPI_ENABLE));
681 if (ACPI_FAILURE(status)) {
682 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
693 static int __init acpi_bus_init(void)
696 acpi_status status = AE_OK;
697 extern acpi_status acpi_os_initialize1(void);
700 status = acpi_os_initialize1();
703 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
704 if (ACPI_FAILURE(status)) {
705 printk(KERN_ERR PREFIX
706 "Unable to start the ACPI Interpreter\n");
710 if (ACPI_FAILURE(status)) {
711 printk(KERN_ERR PREFIX
712 "Unable to initialize ACPI OS objects\n");
715 #ifdef CONFIG_ACPI_EC
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()
721 * This is accomplished by looking for the ECDT table, and getting
722 * the EC parameters out of that.
724 status = acpi_ec_ecdt_probe();
725 /* Ignore result. Not having an ECDT is not fatal. */
728 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
729 if (ACPI_FAILURE(status)) {
730 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
734 printk(KERN_INFO PREFIX "Interpreter enabled\n");
736 /* Initialize sleep structures */
740 * Get the system interrupt model and evaluate \_PIC.
742 result = acpi_bus_init_irq();
747 * Register the for all standard device notifications.
750 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
751 &acpi_bus_notify, NULL);
752 if (ACPI_FAILURE(status)) {
753 printk(KERN_ERR PREFIX
754 "Unable to register for device notifications\n");
759 * Create the top ACPI proc directory
761 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
765 /* Mimic structured exception handling */
771 struct kobject *acpi_kobj;
773 static int __init acpi_init(void)
779 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
783 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
785 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
789 result = acpi_bus_init();
792 if (!(pm_flags & PM_APM))
795 printk(KERN_INFO PREFIX
796 "APM is already active, exiting\n");
806 subsys_initcall(acpi_init);