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("acpi_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
) = 0x0F;
108 if (device
->status
.functional
&& !device
->status
.present
) {
109 printk(KERN_WARNING PREFIX
"Device [%s] status [%08x]: "
110 "functional but not present; setting present\n",
111 device
->pnp
.bus_id
, (u32
) STRUCT_TO_INT(device
->status
));
112 device
->status
.present
= 1;
115 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
117 (u32
) STRUCT_TO_INT(device
->status
)));
122 EXPORT_SYMBOL(acpi_bus_get_status
);
124 /* --------------------------------------------------------------------------
126 -------------------------------------------------------------------------- */
128 int acpi_bus_get_power(acpi_handle handle
, int *state
)
131 acpi_status status
= 0;
132 struct acpi_device
*device
= NULL
;
133 unsigned long psc
= 0;
136 result
= acpi_bus_get_device(handle
, &device
);
140 *state
= ACPI_STATE_UNKNOWN
;
142 if (!device
->flags
.power_manageable
) {
143 /* TBD: Non-recursive algorithm for walking up hierarchy */
145 *state
= device
->parent
->power
.state
;
147 *state
= ACPI_STATE_D0
;
150 * Get the device's power state either directly (via _PSC) or
151 * indirectly (via power resources).
153 if (device
->power
.flags
.explicit_get
) {
154 status
= acpi_evaluate_integer(device
->handle
, "_PSC",
156 if (ACPI_FAILURE(status
))
158 device
->power
.state
= (int)psc
;
159 } else if (device
->power
.flags
.power_resources
) {
160 result
= acpi_power_get_inferred_state(device
);
165 *state
= device
->power
.state
;
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is D%d\n",
169 device
->pnp
.bus_id
, device
->power
.state
));
174 EXPORT_SYMBOL(acpi_bus_get_power
);
176 int acpi_bus_set_power(acpi_handle handle
, int state
)
179 acpi_status status
= AE_OK
;
180 struct acpi_device
*device
= NULL
;
181 char object_name
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
184 result
= acpi_bus_get_device(handle
, &device
);
188 if ((state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3
))
191 /* Make sure this is a valid target state */
193 if (!device
->flags
.power_manageable
) {
194 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device `[%s]' is not power manageable\n",
199 * Get device's current power state if it's unknown
200 * This means device power state isn't initialized or previous setting failed
202 if (!device
->flags
.force_power_state
) {
203 if (device
->power
.state
== ACPI_STATE_UNKNOWN
)
204 acpi_bus_get_power(device
->handle
, &device
->power
.state
);
205 if (state
== device
->power
.state
) {
206 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at D%d\n",
211 if (!device
->power
.states
[state
].flags
.valid
) {
212 printk(KERN_WARNING PREFIX
"Device does not support D%d\n", state
);
215 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
216 printk(KERN_WARNING PREFIX
217 "Cannot set device to a higher-powered"
218 " state than parent\n");
225 * On transitions to a high-powered state we first apply power (via
226 * power resources) then evalute _PSx. Conversly for transitions to
227 * a lower-powered state.
229 if (state
< device
->power
.state
) {
230 if (device
->power
.flags
.power_resources
) {
231 result
= acpi_power_transition(device
, state
);
235 if (device
->power
.states
[state
].flags
.explicit_set
) {
236 status
= acpi_evaluate_object(device
->handle
,
237 object_name
, NULL
, NULL
);
238 if (ACPI_FAILURE(status
)) {
244 if (device
->power
.states
[state
].flags
.explicit_set
) {
245 status
= acpi_evaluate_object(device
->handle
,
246 object_name
, NULL
, NULL
);
247 if (ACPI_FAILURE(status
)) {
252 if (device
->power
.flags
.power_resources
) {
253 result
= acpi_power_transition(device
, state
);
261 printk(KERN_WARNING PREFIX
262 "Transitioning device [%s] to D%d\n",
263 device
->pnp
.bus_id
, state
);
265 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
266 "Device [%s] transitioned to D%d\n",
267 device
->pnp
.bus_id
, state
));
272 EXPORT_SYMBOL(acpi_bus_set_power
);
274 /* --------------------------------------------------------------------------
276 -------------------------------------------------------------------------- */
278 static DEFINE_SPINLOCK(acpi_bus_event_lock
);
280 LIST_HEAD(acpi_bus_event_list
);
281 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue
);
283 extern int event_is_open
;
285 int acpi_bus_generate_event(struct acpi_device
*device
, u8 type
, int data
)
287 struct acpi_bus_event
*event
= NULL
;
288 unsigned long flags
= 0;
294 /* drop event on the floor if no one's listening */
298 event
= kmalloc(sizeof(struct acpi_bus_event
), GFP_ATOMIC
);
302 strcpy(event
->device_class
, device
->pnp
.device_class
);
303 strcpy(event
->bus_id
, device
->pnp
.bus_id
);
307 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
308 list_add_tail(&event
->node
, &acpi_bus_event_list
);
309 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
311 wake_up_interruptible(&acpi_bus_event_queue
);
316 EXPORT_SYMBOL(acpi_bus_generate_event
);
318 int acpi_bus_receive_event(struct acpi_bus_event
*event
)
320 unsigned long flags
= 0;
321 struct acpi_bus_event
*entry
= NULL
;
323 DECLARE_WAITQUEUE(wait
, current
);
329 if (list_empty(&acpi_bus_event_list
)) {
331 set_current_state(TASK_INTERRUPTIBLE
);
332 add_wait_queue(&acpi_bus_event_queue
, &wait
);
334 if (list_empty(&acpi_bus_event_list
))
337 remove_wait_queue(&acpi_bus_event_queue
, &wait
);
338 set_current_state(TASK_RUNNING
);
340 if (signal_pending(current
))
344 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
346 list_entry(acpi_bus_event_list
.next
, struct acpi_bus_event
, node
);
348 list_del(&entry
->node
);
349 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
354 memcpy(event
, entry
, sizeof(struct acpi_bus_event
));
361 EXPORT_SYMBOL(acpi_bus_receive_event
);
363 /* --------------------------------------------------------------------------
364 Notification Handling
365 -------------------------------------------------------------------------- */
368 acpi_bus_check_device(struct acpi_device
*device
, int *status_changed
)
370 acpi_status status
= 0;
371 struct acpi_device_status old_status
;
380 old_status
= device
->status
;
383 * Make sure this device's parent is present before we go about
384 * messing with the device.
386 if (device
->parent
&& !device
->parent
->status
.present
) {
387 device
->status
= device
->parent
->status
;
388 if (STRUCT_TO_INT(old_status
) != STRUCT_TO_INT(device
->status
)) {
395 status
= acpi_bus_get_status(device
);
396 if (ACPI_FAILURE(status
))
399 if (STRUCT_TO_INT(old_status
) == STRUCT_TO_INT(device
->status
))
406 * Device Insertion/Removal
408 if ((device
->status
.present
) && !(old_status
.present
)) {
409 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device insertion detected\n"));
410 /* TBD: Handle device insertion */
411 } else if (!(device
->status
.present
) && (old_status
.present
)) {
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device removal detected\n"));
413 /* TBD: Handle device removal */
419 static int acpi_bus_check_scope(struct acpi_device
*device
)
422 int status_changed
= 0;
429 result
= acpi_bus_check_device(device
, &status_changed
);
437 * TBD: Enumerate child devices within this device's scope and
438 * run acpi_bus_check_device()'s on them.
447 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
449 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
452 struct acpi_device
*device
= NULL
;
455 if (acpi_bus_get_device(handle
, &device
))
460 case ACPI_NOTIFY_BUS_CHECK
:
461 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
462 "Received BUS CHECK notification for device [%s]\n",
463 device
->pnp
.bus_id
));
464 result
= acpi_bus_check_scope(device
);
466 * TBD: We'll need to outsource certain events to non-ACPI
467 * drivers via the device manager (device.c).
471 case ACPI_NOTIFY_DEVICE_CHECK
:
472 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
473 "Received DEVICE CHECK notification for device [%s]\n",
474 device
->pnp
.bus_id
));
475 result
= acpi_bus_check_device(device
, NULL
);
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_WAKE
:
483 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
484 "Received DEVICE WAKE notification for device [%s]\n",
485 device
->pnp
.bus_id
));
489 case ACPI_NOTIFY_EJECT_REQUEST
:
490 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
491 "Received EJECT REQUEST notification for device [%s]\n",
492 device
->pnp
.bus_id
));
496 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
497 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
498 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
499 device
->pnp
.bus_id
));
500 /* TBD: Exactly what does 'light' mean? */
503 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
504 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
505 "Received FREQUENCY MISMATCH notification for device [%s]\n",
506 device
->pnp
.bus_id
));
510 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
511 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
512 "Received BUS MODE MISMATCH notification for device [%s]\n",
513 device
->pnp
.bus_id
));
517 case ACPI_NOTIFY_POWER_FAULT
:
518 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
519 "Received POWER FAULT notification for device [%s]\n",
520 device
->pnp
.bus_id
));
525 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
526 "Received unknown/unsupported notification [%08x]\n",
534 /* --------------------------------------------------------------------------
535 Initialization/Cleanup
536 -------------------------------------------------------------------------- */
538 static int __init
acpi_bus_init_irq(void)
540 acpi_status status
= AE_OK
;
541 union acpi_object arg
= { ACPI_TYPE_INTEGER
};
542 struct acpi_object_list arg_list
= { 1, &arg
};
543 char *message
= NULL
;
547 * Let the system know what interrupt model we are using by
548 * evaluating the \_PIC object, if exists.
551 switch (acpi_irq_model
) {
552 case ACPI_IRQ_MODEL_PIC
:
555 case ACPI_IRQ_MODEL_IOAPIC
:
558 case ACPI_IRQ_MODEL_IOSAPIC
:
561 case ACPI_IRQ_MODEL_PLATFORM
:
562 message
= "platform specific model";
565 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
569 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
571 arg
.integer
.value
= acpi_irq_model
;
573 status
= acpi_evaluate_object(NULL
, "\\_PIC", &arg_list
, NULL
);
574 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
575 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
582 acpi_native_uint acpi_gbl_permanent_mmap
;
585 void __init
acpi_early_init(void)
587 acpi_status status
= AE_OK
;
592 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
594 /* enable workarounds, unless strict ACPI spec. compliance */
596 acpi_gbl_enable_interpreter_slack
= TRUE
;
598 acpi_gbl_permanent_mmap
= 1;
600 status
= acpi_reallocate_root_table();
601 if (ACPI_FAILURE(status
)) {
602 printk(KERN_ERR PREFIX
603 "Unable to reallocate ACPI tables\n");
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");
623 extern acpi_interrupt_flags acpi_sci_flags
;
625 /* compatible (0) means level (3) */
626 if (acpi_sci_flags
.trigger
== 0)
627 acpi_sci_flags
.trigger
= 3;
629 /* Set PIC-mode SCI trigger type */
630 acpi_pic_sci_set_trigger(acpi_gbl_FADT
.sci_interrupt
,
631 acpi_sci_flags
.trigger
);
633 extern int acpi_sci_override_gsi
;
635 * now that acpi_gbl_FADT is initialized,
636 * update it with result from INT_SRC_OVR parsing
638 acpi_gbl_FADT
.sci_interrupt
= acpi_sci_override_gsi
;
643 acpi_enable_subsystem(~
644 (ACPI_NO_HARDWARE_INIT
|
645 ACPI_NO_ACPI_ENABLE
));
646 if (ACPI_FAILURE(status
)) {
647 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
658 static int __init
acpi_bus_init(void)
661 acpi_status status
= AE_OK
;
662 extern acpi_status
acpi_os_initialize1(void);
665 status
= acpi_os_initialize1();
668 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT
| ACPI_NO_ACPI_ENABLE
);
669 if (ACPI_FAILURE(status
)) {
670 printk(KERN_ERR PREFIX
671 "Unable to start the ACPI Interpreter\n");
675 if (ACPI_FAILURE(status
)) {
676 printk(KERN_ERR PREFIX
677 "Unable to initialize ACPI OS objects\n");
680 #ifdef CONFIG_ACPI_EC
682 * ACPI 2.0 requires the EC driver to be loaded and work before
683 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
686 * This is accomplished by looking for the ECDT table, and getting
687 * the EC parameters out of that.
689 status
= acpi_ec_ecdt_probe();
690 /* Ignore result. Not having an ECDT is not fatal. */
693 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
694 if (ACPI_FAILURE(status
)) {
695 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
699 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
702 * Get the system interrupt model and evaluate \_PIC.
704 result
= acpi_bus_init_irq();
709 * Register the for all standard device notifications.
712 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
713 &acpi_bus_notify
, NULL
);
714 if (ACPI_FAILURE(status
)) {
715 printk(KERN_ERR PREFIX
716 "Unable to register for device notifications\n");
721 * Create the top ACPI proc directory
723 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
727 /* Mimic structured exception handling */
733 decl_subsys(acpi
, NULL
, NULL
);
735 static int __init
acpi_init(void)
741 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
745 result
= firmware_register(&acpi_subsys
);
747 printk(KERN_WARNING
"%s: firmware_register error: %d\n",
748 __FUNCTION__
, result
);
750 result
= acpi_bus_init();
753 #ifdef CONFIG_PM_LEGACY
757 printk(KERN_INFO PREFIX
758 "APM is already active, exiting\n");
769 subsys_initcall(acpi_init
);