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>
32 #include <linux/reboot.h>
34 #include <asm/mpspec.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
40 #define _COMPONENT ACPI_BUS_COMPONENT
41 ACPI_MODULE_NAME ("acpi_bus")
44 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
47 FADT_DESCRIPTOR acpi_fadt;
48 struct acpi_device *acpi_root;
49 struct proc_dir_entry *acpi_root_dir;
51 #define STRUCT_TO_INT(s) (*((int*)&s))
53 /* --------------------------------------------------------------------------
55 -------------------------------------------------------------------------- */
57 extern void acpi_bus_data_handler (
64 struct acpi_device **device)
66 acpi_status status = AE_OK;
68 ACPI_FUNCTION_TRACE("acpi_bus_get_device");
71 return_VALUE(-EINVAL);
73 /* TBD: Support fixed-feature devices */
75 status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
76 if (ACPI_FAILURE(status) || !*device) {
77 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context for object [%p]\n",
79 return_VALUE(-ENODEV);
87 struct acpi_device *device)
89 acpi_status status = AE_OK;
90 unsigned long sta = 0;
92 ACPI_FUNCTION_TRACE("acpi_bus_get_status");
95 return_VALUE(-EINVAL);
98 * Evaluate _STA if present.
100 if (device->flags.dynamic_status) {
101 status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
102 if (ACPI_FAILURE(status))
103 return_VALUE(-ENODEV);
104 STRUCT_TO_INT(device->status) = (int) sta;
108 * Otherwise we assume the status of our parent (unless we don't
109 * have one, in which case status is implied).
111 else if (device->parent)
112 device->status = device->parent->status;
114 STRUCT_TO_INT(device->status) = 0x0F;
116 if (device->status.functional && !device->status.present) {
117 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
118 "functional but not present; setting present\n",
120 (u32) STRUCT_TO_INT(device->status));
121 device->status.present = 1;
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
125 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)));
131 /* --------------------------------------------------------------------------
133 -------------------------------------------------------------------------- */
141 acpi_status status = 0;
142 struct acpi_device *device = NULL;
143 unsigned long psc = 0;
145 ACPI_FUNCTION_TRACE("acpi_bus_get_power");
147 result = acpi_bus_get_device(handle, &device);
149 return_VALUE(result);
151 *state = ACPI_STATE_UNKNOWN;
153 if (!device->flags.power_manageable) {
154 /* TBD: Non-recursive algorithm for walking up hierarchy */
156 *state = device->parent->power.state;
158 *state = ACPI_STATE_D0;
162 * Get the device's power state either directly (via _PSC) or
163 * indirectly (via power resources).
165 if (device->power.flags.explicit_get) {
166 status = acpi_evaluate_integer(device->handle, "_PSC",
168 if (ACPI_FAILURE(status))
169 return_VALUE(-ENODEV);
170 device->power.state = (int) psc;
172 else if (device->power.flags.power_resources) {
173 result = acpi_power_get_inferred_state(device);
175 return_VALUE(result);
178 *state = device->power.state;
181 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
182 device->pnp.bus_id, device->power.state));
194 acpi_status status = AE_OK;
195 struct acpi_device *device = NULL;
196 char object_name[5] = {'_','P','S','0'+state,'\0'};
198 ACPI_FUNCTION_TRACE("acpi_bus_set_power");
200 result = acpi_bus_get_device(handle, &device);
202 return_VALUE(result);
204 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
205 return_VALUE(-EINVAL);
207 /* Make sure this is a valid target state */
209 if (!device->flags.power_manageable) {
210 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
211 return_VALUE(-ENODEV);
213 if (state == device->power.state) {
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
217 if (!device->power.states[state].flags.valid) {
218 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state));
219 return_VALUE(-ENODEV);
221 if (device->parent && (state < device->parent->power.state)) {
222 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n"));
223 return_VALUE(-ENODEV);
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.
233 if (state < device->power.state) {
234 if (device->power.flags.power_resources) {
235 result = acpi_power_transition(device, state);
239 if (device->power.states[state].flags.explicit_set) {
240 status = acpi_evaluate_object(device->handle,
241 object_name, NULL, NULL);
242 if (ACPI_FAILURE(status)) {
249 if (device->power.states[state].flags.explicit_set) {
250 status = acpi_evaluate_object(device->handle,
251 object_name, NULL, NULL);
252 if (ACPI_FAILURE(status)) {
257 if (device->power.flags.power_resources) {
258 result = acpi_power_transition(device, state);
266 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n",
267 device->pnp.bus_id, state));
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n",
270 device->pnp.bus_id, state));
272 return_VALUE(result);
277 /* --------------------------------------------------------------------------
279 -------------------------------------------------------------------------- */
281 static spinlock_t acpi_bus_event_lock = SPIN_LOCK_UNLOCKED;
283 LIST_HEAD(acpi_bus_event_list);
284 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
286 extern int event_is_open;
289 acpi_bus_generate_event (
290 struct acpi_device *device,
294 struct acpi_bus_event *event = NULL;
295 unsigned long flags = 0;
297 ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
300 return_VALUE(-EINVAL);
302 /* drop event on the floor if no one's listening */
306 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
308 return_VALUE(-ENOMEM);
310 strcpy(event->device_class, device->pnp.device_class);
311 strcpy(event->bus_id, device->pnp.bus_id);
315 spin_lock_irqsave(&acpi_bus_event_lock, flags);
316 list_add_tail(&event->node, &acpi_bus_event_list);
317 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
319 wake_up_interruptible(&acpi_bus_event_queue);
325 acpi_bus_receive_event (
326 struct acpi_bus_event *event)
328 unsigned long flags = 0;
329 struct acpi_bus_event *entry = NULL;
331 DECLARE_WAITQUEUE(wait, current);
333 ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
338 if (list_empty(&acpi_bus_event_list)) {
340 set_current_state(TASK_INTERRUPTIBLE);
341 add_wait_queue(&acpi_bus_event_queue, &wait);
343 if (list_empty(&acpi_bus_event_list))
346 remove_wait_queue(&acpi_bus_event_queue, &wait);
347 set_current_state(TASK_RUNNING);
349 if (signal_pending(current))
350 return_VALUE(-ERESTARTSYS);
353 spin_lock_irqsave(&acpi_bus_event_lock, flags);
354 entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
356 list_del(&entry->node);
357 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
360 return_VALUE(-ENODEV);
362 memcpy(event, entry, sizeof(struct acpi_bus_event));
370 /* --------------------------------------------------------------------------
371 Notification Handling
372 -------------------------------------------------------------------------- */
375 acpi_bus_check_device (
376 struct acpi_device *device,
379 acpi_status status = 0;
380 struct acpi_device_status old_status;
382 ACPI_FUNCTION_TRACE("acpi_bus_check_device");
385 return_VALUE(-EINVAL);
390 old_status = device->status;
393 * Make sure this device's parent is present before we go about
394 * messing with the device.
396 if (device->parent && !device->parent->status.present) {
397 device->status = device->parent->status;
398 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
405 status = acpi_bus_get_status(device);
406 if (ACPI_FAILURE(status))
407 return_VALUE(-ENODEV);
409 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
416 * Device Insertion/Removal
418 if ((device->status.present) && !(old_status.present)) {
419 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
420 /* TBD: Handle device insertion */
422 else if (!(device->status.present) && (old_status.present)) {
423 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
424 /* TBD: Handle device removal */
432 acpi_bus_check_scope (
433 struct acpi_device *device)
436 int status_changed = 0;
438 ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
441 return_VALUE(-EINVAL);
444 result = acpi_bus_check_device(device, &status_changed);
446 return_VALUE(result);
452 * TBD: Enumerate child devices within this device's scope and
453 * run acpi_bus_check_device()'s on them.
463 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
472 struct acpi_device *device = NULL;
474 ACPI_FUNCTION_TRACE("acpi_bus_notify");
476 if (acpi_bus_get_device(handle, &device))
481 case ACPI_NOTIFY_BUS_CHECK:
482 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n",
483 device->pnp.bus_id));
484 result = acpi_bus_check_scope(device);
486 * TBD: We'll need to outsource certain events to non-ACPI
487 * drivers via the device manager (device.c).
491 case ACPI_NOTIFY_DEVICE_CHECK:
492 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n",
493 device->pnp.bus_id));
494 result = acpi_bus_check_device(device, NULL);
496 * TBD: We'll need to outsource certain events to non-ACPI
497 * drivers via the device manager (device.c).
501 case ACPI_NOTIFY_DEVICE_WAKE:
502 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n",
503 device->pnp.bus_id));
507 case ACPI_NOTIFY_EJECT_REQUEST:
508 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n",
509 device->pnp.bus_id));
513 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
514 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n",
515 device->pnp.bus_id));
516 /* TBD: Exactly what does 'light' mean? */
519 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
520 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n",
521 device->pnp.bus_id));
525 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
526 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n",
527 device->pnp.bus_id));
531 case ACPI_NOTIFY_POWER_FAULT:
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n",
533 device->pnp.bus_id));
538 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n",
546 /* --------------------------------------------------------------------------
547 Initialization/Cleanup
548 -------------------------------------------------------------------------- */
551 acpi_bus_init_irq (void)
553 acpi_status status = AE_OK;
554 union acpi_object arg = {ACPI_TYPE_INTEGER};
555 struct acpi_object_list arg_list = {1, &arg};
556 char *message = NULL;
558 ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
561 * Let the system know what interrupt model we are using by
562 * evaluating the \_PIC object, if exists.
565 switch (acpi_irq_model) {
566 case ACPI_IRQ_MODEL_PIC:
569 case ACPI_IRQ_MODEL_IOAPIC:
572 case ACPI_IRQ_MODEL_IOSAPIC:
576 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
577 return_VALUE(-ENODEV);
580 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
582 arg.integer.value = acpi_irq_model;
584 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
585 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
586 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
587 return_VALUE(-ENODEV);
594 acpi_machine_reset(void)
597 FADT_DESCRIPTOR *f = &acpi_fadt;
599 if (f->reset_register.register_bit_width != 8) {
600 printk(KERN_WARNING PREFIX "invalid reset register bit width: 0x%x\n", f->reset_register.register_bit_width);
604 if (f->reset_register.register_bit_offset != 0) {
605 printk(KERN_WARNING PREFIX "invalid reset register bit offset: 0x%x\n", f->reset_register.register_bit_offset);
609 if ((f->reset_register.address_space_id != ACPI_ADR_SPACE_SYSTEM_IO) &&
610 (f->reset_register.address_space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
611 (f->reset_register.address_space_id != ACPI_ADR_SPACE_PCI_CONFIG)) {
612 printk(KERN_WARNING PREFIX "invalid reset register address space id: 0x%x\n", f->reset_register.address_space_id);
616 status = acpi_hw_low_level_write(f->reset_register.register_bit_width, f->reset_value, &f->reset_register);
619 printk(KERN_WARNING "ACPI system reset failed 0x%x\n", status);
623 acpi_early_init (void)
625 acpi_status status = AE_OK;
626 struct acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt};
628 ACPI_FUNCTION_TRACE("acpi_early_init");
633 /* enable workarounds, unless strict ACPI spec. compliance */
635 acpi_gbl_enable_interpreter_slack = TRUE;
637 status = acpi_initialize_subsystem();
638 if (ACPI_FAILURE(status)) {
639 printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
643 status = acpi_load_tables();
644 if (ACPI_FAILURE(status)) {
645 printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
650 * Get a separate copy of the FADT for use by other drivers.
652 status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
653 if (ACPI_FAILURE(status)) {
654 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
658 #if defined(CONFIG_X86_64)
660 * Set up system reset via ACPI if defined in FADT.
662 if (acpi_fadt.revision >= 2) {
663 if (acpi_fadt.reset_reg_sup) {
664 printk(KERN_INFO PREFIX "System reset via FADT Reset Register is supported\n");
665 /* if no 8042 KBD controller exists, use ACPI reset */
666 if (!(acpi_fadt.iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER)) {
667 machine_reset = acpi_machine_reset;
668 if (!reboot_override)
669 reboot_type = BOOT_ACPI;
677 extern acpi_interrupt_flags acpi_sci_flags;
679 /* compatible (0) means level (3) */
680 if (acpi_sci_flags.trigger == 0)
681 acpi_sci_flags.trigger = 3;
683 /* Set PIC-mode SCI trigger type */
684 acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
686 extern int acpi_sci_override_gsi;
688 * now that acpi_fadt is initialized,
689 * update it with result from INT_SRC_OVR parsing
691 acpi_fadt.sci_int = acpi_sci_override_gsi;
695 status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE));
696 if (ACPI_FAILURE(status)) {
697 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
712 acpi_status status = AE_OK;
713 extern acpi_status acpi_os_initialize1(void);
715 ACPI_FUNCTION_TRACE("acpi_bus_init");
717 status = acpi_os_initialize1();
719 status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
720 if (ACPI_FAILURE(status)) {
721 printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
725 if (ACPI_FAILURE(status)) {
726 printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n");
729 #ifdef CONFIG_ACPI_EC
731 * ACPI 2.0 requires the EC driver to be loaded and work before
732 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
735 * This is accomplished by looking for the ECDT table, and getting
736 * the EC parameters out of that.
738 status = acpi_ec_ecdt_probe();
739 /* Ignore result. Not having an ECDT is not fatal. */
742 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
743 if (ACPI_FAILURE(status)) {
744 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
748 printk(KERN_INFO PREFIX "Interpreter enabled\n");
751 * Get the system interrupt model and evaluate \_PIC.
753 result = acpi_bus_init_irq();
758 * Register the for all standard device notifications.
760 status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
761 if (ACPI_FAILURE(status)) {
762 printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
767 * Create the top ACPI proc directory
769 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
773 /* Mimic structured exception handling */
776 return_VALUE(-ENODEV);
779 decl_subsys(acpi,NULL,NULL);
781 static int __init acpi_init (void)
785 ACPI_FUNCTION_TRACE("acpi_init");
787 printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
791 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
795 firmware_register(&acpi_subsys);
797 result = acpi_bus_init();
804 printk(KERN_INFO PREFIX "APM is already active, exiting\n");
812 return_VALUE(result);
815 subsys_initcall(acpi_init);