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/pm_legacy.h>
33 #include <linux/device.h>
34 #include <linux/proc_fs.h>
36 #include <asm/mpspec.h>
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
41 #define _COMPONENT ACPI_BUS_COMPONENT
42 ACPI_MODULE_NAME("bus");
44 extern void __init
acpi_pic_sci_set_trigger(unsigned int irq
, u16 trigger
);
47 struct acpi_device
*acpi_root
;
48 struct proc_dir_entry
*acpi_root_dir
;
49 EXPORT_SYMBOL(acpi_root_dir
);
51 #define STRUCT_TO_INT(s) (*((int*)&s))
53 /* --------------------------------------------------------------------------
55 -------------------------------------------------------------------------- */
57 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
59 acpi_status status
= AE_OK
;
65 /* TBD: Support fixed-feature devices */
67 status
= acpi_get_data(handle
, acpi_bus_data_handler
, (void **)device
);
68 if (ACPI_FAILURE(status
) || !*device
) {
69 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
77 EXPORT_SYMBOL(acpi_bus_get_device
);
79 int acpi_bus_get_status(struct acpi_device
*device
)
81 acpi_status status
= AE_OK
;
82 unsigned long sta
= 0;
89 * Evaluate _STA if present.
91 if (device
->flags
.dynamic_status
) {
93 acpi_evaluate_integer(device
->handle
, "_STA", NULL
, &sta
);
94 if (ACPI_FAILURE(status
))
96 STRUCT_TO_INT(device
->status
) = (int)sta
;
100 * Otherwise we assume the status of our parent (unless we don't
101 * have one, in which case status is implied).
103 else if (device
->parent
)
104 device
->status
= device
->parent
->status
;
106 STRUCT_TO_INT(device
->status
) =
107 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
108 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
110 if (device
->status
.functional
&& !device
->status
.present
) {
111 printk(KERN_WARNING PREFIX
"Device [%s] status [%08x]: "
112 "functional but not present; setting present\n",
113 device
->pnp
.bus_id
, (u32
) STRUCT_TO_INT(device
->status
));
114 device
->status
.present
= 1;
117 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
119 (u32
) STRUCT_TO_INT(device
->status
)));
124 EXPORT_SYMBOL(acpi_bus_get_status
);
126 /* --------------------------------------------------------------------------
128 -------------------------------------------------------------------------- */
130 int acpi_bus_get_power(acpi_handle handle
, int *state
)
133 acpi_status status
= 0;
134 struct acpi_device
*device
= NULL
;
135 unsigned long psc
= 0;
138 result
= acpi_bus_get_device(handle
, &device
);
142 *state
= ACPI_STATE_UNKNOWN
;
144 if (!device
->flags
.power_manageable
) {
145 /* TBD: Non-recursive algorithm for walking up hierarchy */
147 *state
= device
->parent
->power
.state
;
149 *state
= ACPI_STATE_D0
;
152 * Get the device's power state either directly (via _PSC) or
153 * indirectly (via power resources).
155 if (device
->power
.flags
.explicit_get
) {
156 status
= acpi_evaluate_integer(device
->handle
, "_PSC",
158 if (ACPI_FAILURE(status
))
160 device
->power
.state
= (int)psc
;
161 } else if (device
->power
.flags
.power_resources
) {
162 result
= acpi_power_get_inferred_state(device
);
167 *state
= device
->power
.state
;
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is D%d\n",
171 device
->pnp
.bus_id
, device
->power
.state
));
176 EXPORT_SYMBOL(acpi_bus_get_power
);
178 int acpi_bus_set_power(acpi_handle handle
, int state
)
181 acpi_status status
= AE_OK
;
182 struct acpi_device
*device
= NULL
;
183 char object_name
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
186 result
= acpi_bus_get_device(handle
, &device
);
190 if ((state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3
))
193 /* Make sure this is a valid target state */
195 if (!device
->flags
.power_manageable
) {
196 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device `[%s]' is not power manageable\n",
197 device
->dev
.kobj
.name
));
201 * Get device's current power state if it's unknown
202 * This means device power state isn't initialized or previous setting failed
204 if ((device
->power
.state
== ACPI_STATE_UNKNOWN
) || device
->flags
.force_power_state
)
205 acpi_bus_get_power(device
->handle
, &device
->power
.state
);
206 if ((state
== device
->power
.state
) && !device
->flags
.force_power_state
) {
207 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at D%d\n",
212 if (!device
->power
.states
[state
].flags
.valid
) {
213 printk(KERN_WARNING PREFIX
"Device does not support D%d\n", state
);
216 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
217 printk(KERN_WARNING PREFIX
218 "Cannot set device to a higher-powered"
219 " state than parent\n");
226 * On transitions to a high-powered state we first apply power (via
227 * power resources) then evalute _PSx. Conversly for transitions to
228 * a lower-powered state.
230 if (state
< device
->power
.state
) {
231 if (device
->power
.flags
.power_resources
) {
232 result
= acpi_power_transition(device
, state
);
236 if (device
->power
.states
[state
].flags
.explicit_set
) {
237 status
= acpi_evaluate_object(device
->handle
,
238 object_name
, NULL
, NULL
);
239 if (ACPI_FAILURE(status
)) {
245 if (device
->power
.states
[state
].flags
.explicit_set
) {
246 status
= acpi_evaluate_object(device
->handle
,
247 object_name
, NULL
, NULL
);
248 if (ACPI_FAILURE(status
)) {
253 if (device
->power
.flags
.power_resources
) {
254 result
= acpi_power_transition(device
, state
);
262 printk(KERN_WARNING PREFIX
263 "Transitioning device [%s] to D%d\n",
264 device
->pnp
.bus_id
, state
);
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
267 "Device [%s] transitioned to D%d\n",
268 device
->pnp
.bus_id
, state
));
273 EXPORT_SYMBOL(acpi_bus_set_power
);
275 /* --------------------------------------------------------------------------
277 -------------------------------------------------------------------------- */
279 #ifdef CONFIG_ACPI_PROC_EVENT
280 static DEFINE_SPINLOCK(acpi_bus_event_lock
);
282 LIST_HEAD(acpi_bus_event_list
);
283 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue
);
285 extern int event_is_open
;
287 int acpi_bus_generate_proc_event(struct acpi_device
*device
, u8 type
, int data
)
289 struct acpi_bus_event
*event
= NULL
;
290 unsigned long flags
= 0;
296 /* drop event on the floor if no one's listening */
300 event
= kmalloc(sizeof(struct acpi_bus_event
), GFP_ATOMIC
);
304 strcpy(event
->device_class
, device
->pnp
.device_class
);
305 strcpy(event
->bus_id
, device
->pnp
.bus_id
);
309 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
310 list_add_tail(&event
->node
, &acpi_bus_event_list
);
311 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
313 wake_up_interruptible(&acpi_bus_event_queue
);
318 EXPORT_SYMBOL(acpi_bus_generate_proc_event
);
320 int acpi_bus_receive_event(struct acpi_bus_event
*event
)
322 unsigned long flags
= 0;
323 struct acpi_bus_event
*entry
= NULL
;
325 DECLARE_WAITQUEUE(wait
, current
);
331 if (list_empty(&acpi_bus_event_list
)) {
333 set_current_state(TASK_INTERRUPTIBLE
);
334 add_wait_queue(&acpi_bus_event_queue
, &wait
);
336 if (list_empty(&acpi_bus_event_list
))
339 remove_wait_queue(&acpi_bus_event_queue
, &wait
);
340 set_current_state(TASK_RUNNING
);
342 if (signal_pending(current
))
346 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
348 list_entry(acpi_bus_event_list
.next
, struct acpi_bus_event
, node
);
350 list_del(&entry
->node
);
351 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
356 memcpy(event
, entry
, sizeof(struct acpi_bus_event
));
363 EXPORT_SYMBOL(acpi_bus_receive_event
);
364 #endif /* CONFIG_ACPI_PROC_EVENT */
366 /* --------------------------------------------------------------------------
367 Notification Handling
368 -------------------------------------------------------------------------- */
371 acpi_bus_check_device(struct acpi_device
*device
, int *status_changed
)
373 acpi_status status
= 0;
374 struct acpi_device_status old_status
;
383 old_status
= device
->status
;
386 * Make sure this device's parent is present before we go about
387 * messing with the device.
389 if (device
->parent
&& !device
->parent
->status
.present
) {
390 device
->status
= device
->parent
->status
;
391 if (STRUCT_TO_INT(old_status
) != STRUCT_TO_INT(device
->status
)) {
398 status
= acpi_bus_get_status(device
);
399 if (ACPI_FAILURE(status
))
402 if (STRUCT_TO_INT(old_status
) == STRUCT_TO_INT(device
->status
))
409 * Device Insertion/Removal
411 if ((device
->status
.present
) && !(old_status
.present
)) {
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device insertion detected\n"));
413 /* TBD: Handle device insertion */
414 } else if (!(device
->status
.present
) && (old_status
.present
)) {
415 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device removal detected\n"));
416 /* TBD: Handle device removal */
422 static int acpi_bus_check_scope(struct acpi_device
*device
)
425 int status_changed
= 0;
432 result
= acpi_bus_check_device(device
, &status_changed
);
440 * TBD: Enumerate child devices within this device's scope and
441 * run acpi_bus_check_device()'s on them.
450 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
452 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
455 struct acpi_device
*device
= NULL
;
458 if (acpi_bus_get_device(handle
, &device
))
463 case ACPI_NOTIFY_BUS_CHECK
:
464 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
465 "Received BUS CHECK notification for device [%s]\n",
466 device
->pnp
.bus_id
));
467 result
= acpi_bus_check_scope(device
);
469 * TBD: We'll need to outsource certain events to non-ACPI
470 * drivers via the device manager (device.c).
474 case ACPI_NOTIFY_DEVICE_CHECK
:
475 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
476 "Received DEVICE CHECK notification for device [%s]\n",
477 device
->pnp
.bus_id
));
478 result
= acpi_bus_check_device(device
, NULL
);
480 * TBD: We'll need to outsource certain events to non-ACPI
481 * drivers via the device manager (device.c).
485 case ACPI_NOTIFY_DEVICE_WAKE
:
486 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
487 "Received DEVICE WAKE notification for device [%s]\n",
488 device
->pnp
.bus_id
));
492 case ACPI_NOTIFY_EJECT_REQUEST
:
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
494 "Received EJECT REQUEST notification for device [%s]\n",
495 device
->pnp
.bus_id
));
499 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
500 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
501 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
502 device
->pnp
.bus_id
));
503 /* TBD: Exactly what does 'light' mean? */
506 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
507 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
508 "Received FREQUENCY MISMATCH notification for device [%s]\n",
509 device
->pnp
.bus_id
));
513 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
514 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
515 "Received BUS MODE MISMATCH notification for device [%s]\n",
516 device
->pnp
.bus_id
));
520 case ACPI_NOTIFY_POWER_FAULT
:
521 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
522 "Received POWER FAULT notification for device [%s]\n",
523 device
->pnp
.bus_id
));
528 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
529 "Received unknown/unsupported notification [%08x]\n",
537 /* --------------------------------------------------------------------------
538 Initialization/Cleanup
539 -------------------------------------------------------------------------- */
541 static int __init
acpi_bus_init_irq(void)
543 acpi_status status
= AE_OK
;
544 union acpi_object arg
= { ACPI_TYPE_INTEGER
};
545 struct acpi_object_list arg_list
= { 1, &arg
};
546 char *message
= NULL
;
550 * Let the system know what interrupt model we are using by
551 * evaluating the \_PIC object, if exists.
554 switch (acpi_irq_model
) {
555 case ACPI_IRQ_MODEL_PIC
:
558 case ACPI_IRQ_MODEL_IOAPIC
:
561 case ACPI_IRQ_MODEL_IOSAPIC
:
564 case ACPI_IRQ_MODEL_PLATFORM
:
565 message
= "platform specific model";
568 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
572 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
574 arg
.integer
.value
= acpi_irq_model
;
576 status
= acpi_evaluate_object(NULL
, "\\_PIC", &arg_list
, NULL
);
577 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
578 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
585 acpi_native_uint acpi_gbl_permanent_mmap
;
588 void __init
acpi_early_init(void)
590 acpi_status status
= AE_OK
;
595 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
597 /* enable workarounds, unless strict ACPI spec. compliance */
599 acpi_gbl_enable_interpreter_slack
= TRUE
;
601 acpi_gbl_permanent_mmap
= 1;
603 status
= acpi_reallocate_root_table();
604 if (ACPI_FAILURE(status
)) {
605 printk(KERN_ERR PREFIX
606 "Unable to reallocate ACPI tables\n");
610 status
= acpi_initialize_subsystem();
611 if (ACPI_FAILURE(status
)) {
612 printk(KERN_ERR PREFIX
613 "Unable to initialize the ACPI Interpreter\n");
617 status
= acpi_load_tables();
618 if (ACPI_FAILURE(status
)) {
619 printk(KERN_ERR PREFIX
620 "Unable to load the System Description Tables\n");
626 extern u8 acpi_sci_flags
;
628 /* compatible (0) means level (3) */
629 if (!(acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
)) {
630 acpi_sci_flags
&= ~ACPI_MADT_TRIGGER_MASK
;
631 acpi_sci_flags
|= ACPI_MADT_TRIGGER_LEVEL
;
633 /* Set PIC-mode SCI trigger type */
634 acpi_pic_sci_set_trigger(acpi_gbl_FADT
.sci_interrupt
,
635 (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2);
637 extern int acpi_sci_override_gsi
;
639 * now that acpi_gbl_FADT is initialized,
640 * update it with result from INT_SRC_OVR parsing
642 acpi_gbl_FADT
.sci_interrupt
= acpi_sci_override_gsi
;
647 acpi_enable_subsystem(~
648 (ACPI_NO_HARDWARE_INIT
|
649 ACPI_NO_ACPI_ENABLE
));
650 if (ACPI_FAILURE(status
)) {
651 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
662 static int __init
acpi_bus_init(void)
665 acpi_status status
= AE_OK
;
666 extern acpi_status
acpi_os_initialize1(void);
669 status
= acpi_os_initialize1();
672 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT
| ACPI_NO_ACPI_ENABLE
);
673 if (ACPI_FAILURE(status
)) {
674 printk(KERN_ERR PREFIX
675 "Unable to start the ACPI Interpreter\n");
679 if (ACPI_FAILURE(status
)) {
680 printk(KERN_ERR PREFIX
681 "Unable to initialize ACPI OS objects\n");
684 #ifdef CONFIG_ACPI_EC
686 * ACPI 2.0 requires the EC driver to be loaded and work before
687 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
690 * This is accomplished by looking for the ECDT table, and getting
691 * the EC parameters out of that.
693 status
= acpi_ec_ecdt_probe();
694 /* Ignore result. Not having an ECDT is not fatal. */
697 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
698 if (ACPI_FAILURE(status
)) {
699 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
703 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
705 /* Initialize sleep structures */
709 * Get the system interrupt model and evaluate \_PIC.
711 result
= acpi_bus_init_irq();
716 * Register the for all standard device notifications.
719 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
720 &acpi_bus_notify
, NULL
);
721 if (ACPI_FAILURE(status
)) {
722 printk(KERN_ERR PREFIX
723 "Unable to register for device notifications\n");
728 * Create the top ACPI proc directory
730 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
734 /* Mimic structured exception handling */
740 decl_subsys(acpi
, NULL
, NULL
);
742 static int __init
acpi_init(void)
748 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
752 result
= firmware_register(&acpi_subsys
);
754 printk(KERN_WARNING
"%s: firmware_register error: %d\n",
755 __FUNCTION__
, result
);
757 result
= acpi_bus_init();
760 #ifdef CONFIG_PM_LEGACY
764 printk(KERN_INFO PREFIX
765 "APM is already active, exiting\n");
776 subsys_initcall(acpi_init
);