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_DEBUG_PRINT((ACPI_DB_WARN
, "No context for object [%p]\n",
74 return_VALUE(-ENODEV
);
80 EXPORT_SYMBOL(acpi_bus_get_device
);
82 int acpi_bus_get_status(struct acpi_device
*device
)
84 acpi_status status
= AE_OK
;
85 unsigned long sta
= 0;
87 ACPI_FUNCTION_TRACE("acpi_bus_get_status");
90 return_VALUE(-EINVAL
);
93 * Evaluate _STA if present.
95 if (device
->flags
.dynamic_status
) {
97 acpi_evaluate_integer(device
->handle
, "_STA", NULL
, &sta
);
98 if (ACPI_FAILURE(status
))
99 return_VALUE(-ENODEV
);
100 STRUCT_TO_INT(device
->status
) = (int)sta
;
104 * Otherwise we assume the status of our parent (unless we don't
105 * have one, in which case status is implied).
107 else if (device
->parent
)
108 device
->status
= device
->parent
->status
;
110 STRUCT_TO_INT(device
->status
) = 0x0F;
112 if (device
->status
.functional
&& !device
->status
.present
) {
113 printk(KERN_WARNING PREFIX
"Device [%s] status [%08x]: "
114 "functional but not present; setting present\n",
115 device
->pnp
.bus_id
, (u32
) STRUCT_TO_INT(device
->status
));
116 device
->status
.present
= 1;
119 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
121 (u32
) STRUCT_TO_INT(device
->status
)));
126 EXPORT_SYMBOL(acpi_bus_get_status
);
128 /* --------------------------------------------------------------------------
130 -------------------------------------------------------------------------- */
132 int acpi_bus_get_power(acpi_handle handle
, int *state
)
135 acpi_status status
= 0;
136 struct acpi_device
*device
= NULL
;
137 unsigned long psc
= 0;
139 ACPI_FUNCTION_TRACE("acpi_bus_get_power");
141 result
= acpi_bus_get_device(handle
, &device
);
143 return_VALUE(result
);
145 *state
= ACPI_STATE_UNKNOWN
;
147 if (!device
->flags
.power_manageable
) {
148 /* TBD: Non-recursive algorithm for walking up hierarchy */
150 *state
= device
->parent
->power
.state
;
152 *state
= ACPI_STATE_D0
;
155 * Get the device's power state either directly (via _PSC) or
156 * indirectly (via power resources).
158 if (device
->power
.flags
.explicit_get
) {
159 status
= acpi_evaluate_integer(device
->handle
, "_PSC",
161 if (ACPI_FAILURE(status
))
162 return_VALUE(-ENODEV
);
163 device
->power
.state
= (int)psc
;
164 } else if (device
->power
.flags
.power_resources
) {
165 result
= acpi_power_get_inferred_state(device
);
167 return_VALUE(result
);
170 *state
= device
->power
.state
;
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is D%d\n",
174 device
->pnp
.bus_id
, device
->power
.state
));
179 EXPORT_SYMBOL(acpi_bus_get_power
);
181 int acpi_bus_set_power(acpi_handle handle
, int state
)
184 acpi_status status
= AE_OK
;
185 struct acpi_device
*device
= NULL
;
186 char object_name
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
188 ACPI_FUNCTION_TRACE("acpi_bus_set_power");
190 result
= acpi_bus_get_device(handle
, &device
);
192 return_VALUE(result
);
194 if ((state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3
))
195 return_VALUE(-EINVAL
);
197 /* Make sure this is a valid target state */
199 if (!device
->flags
.power_manageable
) {
200 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
201 "Device is not power manageable\n"));
202 return_VALUE(-ENODEV
);
205 * Get device's current power state if it's unknown
206 * This means device power state isn't initialized or previous setting failed
208 if (!device
->flags
.force_power_state
) {
209 if (device
->power
.state
== ACPI_STATE_UNKNOWN
)
210 acpi_bus_get_power(device
->handle
, &device
->power
.state
);
211 if (state
== device
->power
.state
) {
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at D%d\n",
217 if (!device
->power
.states
[state
].flags
.valid
) {
218 ACPI_DEBUG_PRINT((ACPI_DB_WARN
, "Device does not support D%d\n",
220 return_VALUE(-ENODEV
);
222 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
223 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
224 "Cannot set device to a higher-powered state than parent\n"));
225 return_VALUE(-ENODEV
);
231 * On transitions to a high-powered state we first apply power (via
232 * power resources) then evalute _PSx. Conversly for transitions to
233 * a lower-powered state.
235 if (state
< device
->power
.state
) {
236 if (device
->power
.flags
.power_resources
) {
237 result
= acpi_power_transition(device
, state
);
241 if (device
->power
.states
[state
].flags
.explicit_set
) {
242 status
= acpi_evaluate_object(device
->handle
,
243 object_name
, NULL
, NULL
);
244 if (ACPI_FAILURE(status
)) {
250 if (device
->power
.states
[state
].flags
.explicit_set
) {
251 status
= acpi_evaluate_object(device
->handle
,
252 object_name
, NULL
, NULL
);
253 if (ACPI_FAILURE(status
)) {
258 if (device
->power
.flags
.power_resources
) {
259 result
= acpi_power_transition(device
, state
);
267 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
268 "Error transitioning device [%s] to D%d\n",
269 device
->pnp
.bus_id
, state
));
271 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
272 "Device [%s] transitioned to D%d\n",
273 device
->pnp
.bus_id
, state
));
275 return_VALUE(result
);
278 EXPORT_SYMBOL(acpi_bus_set_power
);
280 /* --------------------------------------------------------------------------
282 -------------------------------------------------------------------------- */
284 static DEFINE_SPINLOCK(acpi_bus_event_lock
);
286 LIST_HEAD(acpi_bus_event_list
);
287 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue
);
289 extern int event_is_open
;
291 int acpi_bus_generate_event(struct acpi_device
*device
, u8 type
, int data
)
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
);
323 EXPORT_SYMBOL(acpi_bus_generate_event
);
325 int acpi_bus_receive_event(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");
335 return_VALUE(-EINVAL
);
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
);
354 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
));
369 EXPORT_SYMBOL(acpi_bus_receive_event
);
371 /* --------------------------------------------------------------------------
372 Notification Handling
373 -------------------------------------------------------------------------- */
376 acpi_bus_check_device(struct acpi_device
*device
, int *status_changed
)
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 */
420 } else if (!(device
->status
.present
) && (old_status
.present
)) {
421 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device removal detected\n"));
422 /* TBD: Handle device removal */
428 static int acpi_bus_check_scope(struct acpi_device
*device
)
431 int status_changed
= 0;
433 ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
436 return_VALUE(-EINVAL
);
439 result
= acpi_bus_check_device(device
, &status_changed
);
441 return_VALUE(result
);
447 * TBD: Enumerate child devices within this device's scope and
448 * run acpi_bus_check_device()'s on them.
457 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
459 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
462 struct acpi_device
*device
= NULL
;
464 ACPI_FUNCTION_TRACE("acpi_bus_notify");
466 if (acpi_bus_get_device(handle
, &device
))
471 case ACPI_NOTIFY_BUS_CHECK
:
472 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
473 "Received BUS CHECK notification for device [%s]\n",
474 device
->pnp
.bus_id
));
475 result
= acpi_bus_check_scope(device
);
477 * TBD: We'll need to outsource certain events to non-ACPI
478 * drivers via the device manager (device.c).
482 case ACPI_NOTIFY_DEVICE_CHECK
:
483 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
484 "Received DEVICE CHECK notification for device [%s]\n",
485 device
->pnp
.bus_id
));
486 result
= acpi_bus_check_device(device
, NULL
);
488 * TBD: We'll need to outsource certain events to non-ACPI
489 * drivers via the device manager (device.c).
493 case ACPI_NOTIFY_DEVICE_WAKE
:
494 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
495 "Received DEVICE WAKE notification for device [%s]\n",
496 device
->pnp
.bus_id
));
500 case ACPI_NOTIFY_EJECT_REQUEST
:
501 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
502 "Received EJECT REQUEST notification for device [%s]\n",
503 device
->pnp
.bus_id
));
507 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
508 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
509 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
510 device
->pnp
.bus_id
));
511 /* TBD: Exactly what does 'light' mean? */
514 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
515 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
516 "Received FREQUENCY MISMATCH notification for device [%s]\n",
517 device
->pnp
.bus_id
));
521 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
522 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
523 "Received BUS MODE MISMATCH notification for device [%s]\n",
524 device
->pnp
.bus_id
));
528 case ACPI_NOTIFY_POWER_FAULT
:
529 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
530 "Received POWER FAULT notification for device [%s]\n",
531 device
->pnp
.bus_id
));
536 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
537 "Received unknown/unsupported notification [%08x]\n",
545 /* --------------------------------------------------------------------------
546 Initialization/Cleanup
547 -------------------------------------------------------------------------- */
549 static int __init
acpi_bus_init_irq(void)
551 acpi_status status
= AE_OK
;
552 union acpi_object arg
= { ACPI_TYPE_INTEGER
};
553 struct acpi_object_list arg_list
= { 1, &arg
};
554 char *message
= NULL
;
556 ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
559 * Let the system know what interrupt model we are using by
560 * evaluating the \_PIC object, if exists.
563 switch (acpi_irq_model
) {
564 case ACPI_IRQ_MODEL_PIC
:
567 case ACPI_IRQ_MODEL_IOAPIC
:
570 case ACPI_IRQ_MODEL_IOSAPIC
:
574 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
575 return_VALUE(-ENODEV
);
578 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
580 arg
.integer
.value
= acpi_irq_model
;
582 status
= acpi_evaluate_object(NULL
, "\\_PIC", &arg_list
, NULL
);
583 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
584 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Error evaluating _PIC\n"));
585 return_VALUE(-ENODEV
);
591 void __init
acpi_early_init(void)
593 acpi_status status
= AE_OK
;
594 struct acpi_buffer buffer
= { sizeof(acpi_fadt
), &acpi_fadt
};
596 ACPI_FUNCTION_TRACE("acpi_early_init");
601 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
603 /* enable workarounds, unless strict ACPI spec. compliance */
605 acpi_gbl_enable_interpreter_slack
= TRUE
;
607 status
= acpi_initialize_subsystem();
608 if (ACPI_FAILURE(status
)) {
609 printk(KERN_ERR PREFIX
610 "Unable to initialize the ACPI Interpreter\n");
614 status
= acpi_load_tables();
615 if (ACPI_FAILURE(status
)) {
616 printk(KERN_ERR PREFIX
617 "Unable to load the System Description Tables\n");
622 * Get a separate copy of the FADT for use by other drivers.
624 status
= acpi_get_table(ACPI_TABLE_ID_FADT
, 1, &buffer
);
625 if (ACPI_FAILURE(status
)) {
626 printk(KERN_ERR PREFIX
"Unable to get the FADT\n");
631 extern acpi_interrupt_flags acpi_sci_flags
;
633 /* compatible (0) means level (3) */
634 if (acpi_sci_flags
.trigger
== 0)
635 acpi_sci_flags
.trigger
= 3;
637 /* Set PIC-mode SCI trigger type */
638 acpi_pic_sci_set_trigger(acpi_fadt
.sci_int
,
639 acpi_sci_flags
.trigger
);
641 extern int acpi_sci_override_gsi
;
643 * now that acpi_fadt is initialized,
644 * update it with result from INT_SRC_OVR parsing
646 acpi_fadt
.sci_int
= acpi_sci_override_gsi
;
651 acpi_enable_subsystem(~
652 (ACPI_NO_HARDWARE_INIT
|
653 ACPI_NO_ACPI_ENABLE
));
654 if (ACPI_FAILURE(status
)) {
655 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
666 static int __init
acpi_bus_init(void)
669 acpi_status status
= AE_OK
;
670 extern acpi_status
acpi_os_initialize1(void);
672 ACPI_FUNCTION_TRACE("acpi_bus_init");
674 status
= acpi_os_initialize1();
677 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT
| ACPI_NO_ACPI_ENABLE
);
678 if (ACPI_FAILURE(status
)) {
679 printk(KERN_ERR PREFIX
680 "Unable to start the ACPI Interpreter\n");
684 if (ACPI_FAILURE(status
)) {
685 printk(KERN_ERR PREFIX
686 "Unable to initialize ACPI OS objects\n");
689 #ifdef CONFIG_ACPI_EC
691 * ACPI 2.0 requires the EC driver to be loaded and work before
692 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
695 * This is accomplished by looking for the ECDT table, and getting
696 * the EC parameters out of that.
698 status
= acpi_ec_ecdt_probe();
699 /* Ignore result. Not having an ECDT is not fatal. */
702 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
703 if (ACPI_FAILURE(status
)) {
704 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
708 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
711 * Get the system interrupt model and evaluate \_PIC.
713 result
= acpi_bus_init_irq();
718 * Register the for all standard device notifications.
721 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
722 &acpi_bus_notify
, NULL
);
723 if (ACPI_FAILURE(status
)) {
724 printk(KERN_ERR PREFIX
725 "Unable to register for device notifications\n");
730 * Create the top ACPI proc directory
732 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
736 /* Mimic structured exception handling */
739 return_VALUE(-ENODEV
);
742 decl_subsys(acpi
, NULL
, NULL
);
744 static int __init
acpi_init(void)
748 ACPI_FUNCTION_TRACE("acpi_init");
751 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
752 return_VALUE(-ENODEV
);
755 firmware_register(&acpi_subsys
);
757 result
= acpi_bus_init();
760 #ifdef CONFIG_PM_LEGACY
764 printk(KERN_INFO PREFIX
765 "APM is already active, exiting\n");
773 return_VALUE(result
);
776 subsys_initcall(acpi_init
);