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/list.h>
29 #include <linux/sched.h>
31 #include <linux/pm_legacy.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("acpi_bus")
43 extern void __init
acpi_pic_sci_set_trigger(unsigned int irq
, u16 trigger
);
46 struct fadt_descriptor acpi_fadt
;
47 EXPORT_SYMBOL(acpi_fadt
);
49 struct acpi_device
*acpi_root
;
50 struct proc_dir_entry
*acpi_root_dir
;
51 EXPORT_SYMBOL(acpi_root_dir
);
53 #define STRUCT_TO_INT(s) (*((int*)&s))
55 /* --------------------------------------------------------------------------
57 -------------------------------------------------------------------------- */
59 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
61 acpi_status status
= AE_OK
;
63 ACPI_FUNCTION_TRACE("acpi_bus_get_device");
66 return_VALUE(-EINVAL
);
68 /* TBD: Support fixed-feature devices */
70 status
= acpi_get_data(handle
, acpi_bus_data_handler
, (void **)device
);
71 if (ACPI_FAILURE(status
) || !*device
) {
72 ACPI_EXCEPTION((AE_INFO
, status
, "No context for object [%p]", handle
));
73 return_VALUE(-ENODEV
);
79 EXPORT_SYMBOL(acpi_bus_get_device
);
81 int acpi_bus_get_status(struct acpi_device
*device
)
83 acpi_status status
= AE_OK
;
84 unsigned long sta
= 0;
86 ACPI_FUNCTION_TRACE("acpi_bus_get_status");
89 return_VALUE(-EINVAL
);
92 * Evaluate _STA if present.
94 if (device
->flags
.dynamic_status
) {
96 acpi_evaluate_integer(device
->handle
, "_STA", NULL
, &sta
);
97 if (ACPI_FAILURE(status
))
98 return_VALUE(-ENODEV
);
99 STRUCT_TO_INT(device
->status
) = (int)sta
;
103 * Otherwise we assume the status of our parent (unless we don't
104 * have one, in which case status is implied).
106 else if (device
->parent
)
107 device
->status
= device
->parent
->status
;
109 STRUCT_TO_INT(device
->status
) = 0x0F;
111 if (device
->status
.functional
&& !device
->status
.present
) {
112 printk(KERN_WARNING PREFIX
"Device [%s] status [%08x]: "
113 "functional but not present; setting present\n",
114 device
->pnp
.bus_id
, (u32
) STRUCT_TO_INT(device
->status
));
115 device
->status
.present
= 1;
118 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
120 (u32
) STRUCT_TO_INT(device
->status
)));
125 EXPORT_SYMBOL(acpi_bus_get_status
);
127 /* --------------------------------------------------------------------------
129 -------------------------------------------------------------------------- */
131 int acpi_bus_get_power(acpi_handle handle
, int *state
)
134 acpi_status status
= 0;
135 struct acpi_device
*device
= NULL
;
136 unsigned long psc
= 0;
138 ACPI_FUNCTION_TRACE("acpi_bus_get_power");
140 result
= acpi_bus_get_device(handle
, &device
);
142 return_VALUE(result
);
144 *state
= ACPI_STATE_UNKNOWN
;
146 if (!device
->flags
.power_manageable
) {
147 /* TBD: Non-recursive algorithm for walking up hierarchy */
149 *state
= device
->parent
->power
.state
;
151 *state
= ACPI_STATE_D0
;
154 * Get the device's power state either directly (via _PSC) or
155 * indirectly (via power resources).
157 if (device
->power
.flags
.explicit_get
) {
158 status
= acpi_evaluate_integer(device
->handle
, "_PSC",
160 if (ACPI_FAILURE(status
))
161 return_VALUE(-ENODEV
);
162 device
->power
.state
= (int)psc
;
163 } else if (device
->power
.flags
.power_resources
) {
164 result
= acpi_power_get_inferred_state(device
);
166 return_VALUE(result
);
169 *state
= device
->power
.state
;
172 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is D%d\n",
173 device
->pnp
.bus_id
, device
->power
.state
));
178 EXPORT_SYMBOL(acpi_bus_get_power
);
180 int acpi_bus_set_power(acpi_handle handle
, int state
)
183 acpi_status status
= AE_OK
;
184 struct acpi_device
*device
= NULL
;
185 char object_name
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
187 ACPI_FUNCTION_TRACE("acpi_bus_set_power");
189 result
= acpi_bus_get_device(handle
, &device
);
191 return_VALUE(result
);
193 if ((state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3
))
194 return_VALUE(-EINVAL
);
196 /* Make sure this is a valid target state */
198 if (!device
->flags
.power_manageable
) {
199 printk(KERN_DEBUG
"Device `[%s]is not power manageable",
201 return_VALUE(-ENODEV
);
204 * Get device's current power state if it's unknown
205 * This means device power state isn't initialized or previous setting failed
207 if (!device
->flags
.force_power_state
) {
208 if (device
->power
.state
== ACPI_STATE_UNKNOWN
)
209 acpi_bus_get_power(device
->handle
, &device
->power
.state
);
210 if (state
== device
->power
.state
) {
211 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at D%d\n",
216 if (!device
->power
.states
[state
].flags
.valid
) {
217 printk(KERN_WARNING PREFIX
"Device does not support D%d\n", state
);
218 return_VALUE(-ENODEV
);
220 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
221 printk(KERN_WARNING PREFIX
222 "Cannot set device to a higher-powered"
223 " state than parent\n");
224 return_VALUE(-ENODEV
);
230 * On transitions to a high-powered state we first apply power (via
231 * power resources) then evalute _PSx. Conversly for transitions to
232 * a lower-powered state.
234 if (state
< device
->power
.state
) {
235 if (device
->power
.flags
.power_resources
) {
236 result
= acpi_power_transition(device
, state
);
240 if (device
->power
.states
[state
].flags
.explicit_set
) {
241 status
= acpi_evaluate_object(device
->handle
,
242 object_name
, NULL
, NULL
);
243 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 printk(KERN_WARNING PREFIX
267 "Transitioning device [%s] to D%d\n",
268 device
->pnp
.bus_id
, state
);
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
271 "Device [%s] transitioned to D%d\n",
272 device
->pnp
.bus_id
, state
));
274 return_VALUE(result
);
277 EXPORT_SYMBOL(acpi_bus_set_power
);
279 /* --------------------------------------------------------------------------
281 -------------------------------------------------------------------------- */
283 static DEFINE_SPINLOCK(acpi_bus_event_lock
);
285 LIST_HEAD(acpi_bus_event_list
);
286 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue
);
288 extern int event_is_open
;
290 int acpi_bus_generate_event(struct acpi_device
*device
, u8 type
, int data
)
292 struct acpi_bus_event
*event
= NULL
;
293 unsigned long flags
= 0;
295 ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
298 return_VALUE(-EINVAL
);
300 /* drop event on the floor if no one's listening */
304 event
= kmalloc(sizeof(struct acpi_bus_event
), GFP_ATOMIC
);
306 return_VALUE(-ENOMEM
);
308 strcpy(event
->device_class
, device
->pnp
.device_class
);
309 strcpy(event
->bus_id
, device
->pnp
.bus_id
);
313 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
314 list_add_tail(&event
->node
, &acpi_bus_event_list
);
315 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
317 wake_up_interruptible(&acpi_bus_event_queue
);
322 EXPORT_SYMBOL(acpi_bus_generate_event
);
324 int acpi_bus_receive_event(struct acpi_bus_event
*event
)
326 unsigned long flags
= 0;
327 struct acpi_bus_event
*entry
= NULL
;
329 DECLARE_WAITQUEUE(wait
, current
);
331 ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
334 return_VALUE(-EINVAL
);
336 if (list_empty(&acpi_bus_event_list
)) {
338 set_current_state(TASK_INTERRUPTIBLE
);
339 add_wait_queue(&acpi_bus_event_queue
, &wait
);
341 if (list_empty(&acpi_bus_event_list
))
344 remove_wait_queue(&acpi_bus_event_queue
, &wait
);
345 set_current_state(TASK_RUNNING
);
347 if (signal_pending(current
))
348 return_VALUE(-ERESTARTSYS
);
351 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
353 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
));
368 EXPORT_SYMBOL(acpi_bus_receive_event
);
370 /* --------------------------------------------------------------------------
371 Notification Handling
372 -------------------------------------------------------------------------- */
375 acpi_bus_check_device(struct acpi_device
*device
, int *status_changed
)
377 acpi_status status
= 0;
378 struct acpi_device_status old_status
;
380 ACPI_FUNCTION_TRACE("acpi_bus_check_device");
383 return_VALUE(-EINVAL
);
388 old_status
= device
->status
;
391 * Make sure this device's parent is present before we go about
392 * messing with the device.
394 if (device
->parent
&& !device
->parent
->status
.present
) {
395 device
->status
= device
->parent
->status
;
396 if (STRUCT_TO_INT(old_status
) != STRUCT_TO_INT(device
->status
)) {
403 status
= acpi_bus_get_status(device
);
404 if (ACPI_FAILURE(status
))
405 return_VALUE(-ENODEV
);
407 if (STRUCT_TO_INT(old_status
) == STRUCT_TO_INT(device
->status
))
414 * Device Insertion/Removal
416 if ((device
->status
.present
) && !(old_status
.present
)) {
417 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device insertion detected\n"));
418 /* TBD: Handle device insertion */
419 } else if (!(device
->status
.present
) && (old_status
.present
)) {
420 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device removal detected\n"));
421 /* TBD: Handle device removal */
427 static int acpi_bus_check_scope(struct acpi_device
*device
)
430 int status_changed
= 0;
432 ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
435 return_VALUE(-EINVAL
);
438 result
= acpi_bus_check_device(device
, &status_changed
);
440 return_VALUE(result
);
446 * TBD: Enumerate child devices within this device's scope and
447 * run acpi_bus_check_device()'s on them.
456 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
458 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
461 struct acpi_device
*device
= NULL
;
463 ACPI_FUNCTION_TRACE("acpi_bus_notify");
465 if (acpi_bus_get_device(handle
, &device
))
470 case ACPI_NOTIFY_BUS_CHECK
:
471 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
472 "Received BUS CHECK notification for device [%s]\n",
473 device
->pnp
.bus_id
));
474 result
= acpi_bus_check_scope(device
);
476 * TBD: We'll need to outsource certain events to non-ACPI
477 * drivers via the device manager (device.c).
481 case ACPI_NOTIFY_DEVICE_CHECK
:
482 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
483 "Received DEVICE CHECK notification for device [%s]\n",
484 device
->pnp
.bus_id
));
485 result
= acpi_bus_check_device(device
, NULL
);
487 * TBD: We'll need to outsource certain events to non-ACPI
488 * drivers via the device manager (device.c).
492 case ACPI_NOTIFY_DEVICE_WAKE
:
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
494 "Received DEVICE WAKE notification for device [%s]\n",
495 device
->pnp
.bus_id
));
499 case ACPI_NOTIFY_EJECT_REQUEST
:
500 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
501 "Received EJECT REQUEST notification for device [%s]\n",
502 device
->pnp
.bus_id
));
506 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
507 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
508 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
509 device
->pnp
.bus_id
));
510 /* TBD: Exactly what does 'light' mean? */
513 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
514 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
515 "Received FREQUENCY MISMATCH notification for device [%s]\n",
516 device
->pnp
.bus_id
));
520 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
521 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
522 "Received BUS MODE MISMATCH notification for device [%s]\n",
523 device
->pnp
.bus_id
));
527 case ACPI_NOTIFY_POWER_FAULT
:
528 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
529 "Received POWER FAULT notification for device [%s]\n",
530 device
->pnp
.bus_id
));
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
536 "Received unknown/unsupported notification [%08x]\n",
544 /* --------------------------------------------------------------------------
545 Initialization/Cleanup
546 -------------------------------------------------------------------------- */
548 static int __init
acpi_bus_init_irq(void)
550 acpi_status status
= AE_OK
;
551 union acpi_object arg
= { ACPI_TYPE_INTEGER
};
552 struct acpi_object_list arg_list
= { 1, &arg
};
553 char *message
= NULL
;
555 ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
558 * Let the system know what interrupt model we are using by
559 * evaluating the \_PIC object, if exists.
562 switch (acpi_irq_model
) {
563 case ACPI_IRQ_MODEL_PIC
:
566 case ACPI_IRQ_MODEL_IOAPIC
:
569 case ACPI_IRQ_MODEL_IOSAPIC
:
573 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
574 return_VALUE(-ENODEV
);
577 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
579 arg
.integer
.value
= acpi_irq_model
;
581 status
= acpi_evaluate_object(NULL
, "\\_PIC", &arg_list
, NULL
);
582 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
583 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
584 return_VALUE(-ENODEV
);
590 void __init
acpi_early_init(void)
592 acpi_status status
= AE_OK
;
593 struct acpi_buffer buffer
= { sizeof(acpi_fadt
), &acpi_fadt
};
595 ACPI_FUNCTION_TRACE("acpi_early_init");
600 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
602 /* enable workarounds, unless strict ACPI spec. compliance */
604 acpi_gbl_enable_interpreter_slack
= TRUE
;
606 status
= acpi_initialize_subsystem();
607 if (ACPI_FAILURE(status
)) {
608 printk(KERN_ERR PREFIX
609 "Unable to initialize the ACPI Interpreter\n");
613 status
= acpi_load_tables();
614 if (ACPI_FAILURE(status
)) {
615 printk(KERN_ERR PREFIX
616 "Unable to load the System Description Tables\n");
621 * Get a separate copy of the FADT for use by other drivers.
623 status
= acpi_get_table(ACPI_TABLE_ID_FADT
, 1, &buffer
);
624 if (ACPI_FAILURE(status
)) {
625 printk(KERN_ERR PREFIX
"Unable to get the FADT\n");
630 extern acpi_interrupt_flags acpi_sci_flags
;
632 /* compatible (0) means level (3) */
633 if (acpi_sci_flags
.trigger
== 0)
634 acpi_sci_flags
.trigger
= 3;
636 /* Set PIC-mode SCI trigger type */
637 acpi_pic_sci_set_trigger(acpi_fadt
.sci_int
,
638 acpi_sci_flags
.trigger
);
640 extern int acpi_sci_override_gsi
;
642 * now that acpi_fadt is initialized,
643 * update it with result from INT_SRC_OVR parsing
645 acpi_fadt
.sci_int
= acpi_sci_override_gsi
;
650 acpi_enable_subsystem(~
651 (ACPI_NO_HARDWARE_INIT
|
652 ACPI_NO_ACPI_ENABLE
));
653 if (ACPI_FAILURE(status
)) {
654 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
665 static int __init
acpi_bus_init(void)
668 acpi_status status
= AE_OK
;
669 extern acpi_status
acpi_os_initialize1(void);
671 ACPI_FUNCTION_TRACE("acpi_bus_init");
673 status
= acpi_os_initialize1();
676 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT
| ACPI_NO_ACPI_ENABLE
);
677 if (ACPI_FAILURE(status
)) {
678 printk(KERN_ERR PREFIX
679 "Unable to start the ACPI Interpreter\n");
683 if (ACPI_FAILURE(status
)) {
684 printk(KERN_ERR PREFIX
685 "Unable to initialize ACPI OS objects\n");
688 #ifdef CONFIG_ACPI_EC
690 * ACPI 2.0 requires the EC driver to be loaded and work before
691 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
694 * This is accomplished by looking for the ECDT table, and getting
695 * the EC parameters out of that.
697 status
= acpi_ec_ecdt_probe();
698 /* Ignore result. Not having an ECDT is not fatal. */
701 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
702 if (ACPI_FAILURE(status
)) {
703 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
707 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
710 * Get the system interrupt model and evaluate \_PIC.
712 result
= acpi_bus_init_irq();
717 * Register the for all standard device notifications.
720 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
721 &acpi_bus_notify
, NULL
);
722 if (ACPI_FAILURE(status
)) {
723 printk(KERN_ERR PREFIX
724 "Unable to register for device notifications\n");
729 * Create the top ACPI proc directory
731 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
735 /* Mimic structured exception handling */
738 return_VALUE(-ENODEV
);
741 decl_subsys(acpi
, NULL
, NULL
);
743 static int __init
acpi_init(void)
747 ACPI_FUNCTION_TRACE("acpi_init");
750 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
751 return_VALUE(-ENODEV
);
754 firmware_register(&acpi_subsys
);
756 result
= acpi_bus_init();
759 #ifdef CONFIG_PM_LEGACY
763 printk(KERN_INFO PREFIX
764 "APM is already active, exiting\n");
772 return_VALUE(result
);
775 subsys_initcall(acpi_init
);