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/device.h>
33 #include <linux/proc_fs.h>
34 #include <linux/acpi.h>
36 #include <asm/mpspec.h>
38 #include <linux/pci.h>
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <linux/dmi.h>
45 #define _COMPONENT ACPI_BUS_COMPONENT
46 ACPI_MODULE_NAME("bus");
48 struct acpi_device
*acpi_root
;
49 struct proc_dir_entry
*acpi_root_dir
;
50 EXPORT_SYMBOL(acpi_root_dir
);
52 #define STRUCT_TO_INT(s) (*((int*)&s))
54 static int set_power_nocheck(const struct dmi_system_id
*id
)
56 printk(KERN_NOTICE PREFIX
"%s detected - "
57 "disable power check in power transistion\n", id
->ident
);
58 acpi_power_nocheck
= 1;
61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table
[] = {
63 set_power_nocheck
, "HP Pavilion 05", {
64 DMI_MATCH(DMI_BIOS_VENDOR
, "Phoenix Technologies LTD"),
65 DMI_MATCH(DMI_SYS_VENDOR
, "HP Pavilion 05"),
66 DMI_MATCH(DMI_PRODUCT_VERSION
, "2001211RE101GLEND") }, NULL
},
71 /* --------------------------------------------------------------------------
73 -------------------------------------------------------------------------- */
75 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
77 acpi_status status
= AE_OK
;
83 /* TBD: Support fixed-feature devices */
85 status
= acpi_get_data(handle
, acpi_bus_data_handler
, (void **)device
);
86 if (ACPI_FAILURE(status
) || !*device
) {
87 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
95 EXPORT_SYMBOL(acpi_bus_get_device
);
97 int acpi_bus_get_status(struct acpi_device
*device
)
99 acpi_status status
= AE_OK
;
100 unsigned long long sta
= 0;
107 * Evaluate _STA if present.
109 if (device
->flags
.dynamic_status
) {
111 acpi_evaluate_integer(device
->handle
, "_STA", NULL
, &sta
);
112 if (ACPI_FAILURE(status
))
114 STRUCT_TO_INT(device
->status
) = (int)sta
;
118 * According to ACPI spec some device can be present and functional
119 * even if the parent is not present but functional.
120 * In such conditions the child device should not inherit the status
124 STRUCT_TO_INT(device
->status
) =
125 ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
126 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
128 if (device
->status
.functional
&& !device
->status
.present
) {
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]: "
130 "functional but not present;\n",
132 (u32
) STRUCT_TO_INT(device
->status
)));
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
137 (u32
) STRUCT_TO_INT(device
->status
)));
142 EXPORT_SYMBOL(acpi_bus_get_status
);
144 void acpi_bus_private_data_handler(acpi_handle handle
,
149 EXPORT_SYMBOL(acpi_bus_private_data_handler
);
151 int acpi_bus_get_private_data(acpi_handle handle
, void **data
)
153 acpi_status status
= AE_OK
;
158 status
= acpi_get_data(handle
, acpi_bus_private_data_handler
, data
);
159 if (ACPI_FAILURE(status
) || !*data
) {
160 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
167 EXPORT_SYMBOL(acpi_bus_get_private_data
);
169 /* --------------------------------------------------------------------------
171 -------------------------------------------------------------------------- */
173 int acpi_bus_get_power(acpi_handle handle
, int *state
)
176 acpi_status status
= 0;
177 struct acpi_device
*device
= NULL
;
178 unsigned long long psc
= 0;
181 result
= acpi_bus_get_device(handle
, &device
);
185 *state
= ACPI_STATE_UNKNOWN
;
187 if (!device
->flags
.power_manageable
) {
188 /* TBD: Non-recursive algorithm for walking up hierarchy */
190 *state
= device
->parent
->power
.state
;
192 *state
= ACPI_STATE_D0
;
195 * Get the device's power state either directly (via _PSC) or
196 * indirectly (via power resources).
198 if (device
->power
.flags
.explicit_get
) {
199 status
= acpi_evaluate_integer(device
->handle
, "_PSC",
201 if (ACPI_FAILURE(status
))
203 device
->power
.state
= (int)psc
;
204 } else if (device
->power
.flags
.power_resources
) {
205 result
= acpi_power_get_inferred_state(device
);
210 *state
= device
->power
.state
;
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is D%d\n",
214 device
->pnp
.bus_id
, device
->power
.state
));
219 EXPORT_SYMBOL(acpi_bus_get_power
);
221 int acpi_bus_set_power(acpi_handle handle
, int state
)
224 acpi_status status
= AE_OK
;
225 struct acpi_device
*device
= NULL
;
226 char object_name
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
229 result
= acpi_bus_get_device(handle
, &device
);
233 if ((state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3
))
236 /* Make sure this is a valid target state */
238 if (!device
->flags
.power_manageable
) {
239 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device `[%s]' is not power manageable\n",
240 kobject_name(&device
->dev
.kobj
)));
244 * Get device's current power state
246 if (!acpi_power_nocheck
) {
248 * Maybe the incorrect power state is returned on the bogus
249 * bios, which is different with the real power state.
250 * For example: the bios returns D0 state and the real power
251 * state is D3. OS expects to set the device to D0 state. In
252 * such case if OS uses the power state returned by the BIOS,
253 * the device can't be transisted to the correct power state.
254 * So if the acpi_power_nocheck is set, it is unnecessary to
255 * get the power state by calling acpi_bus_get_power.
257 acpi_bus_get_power(device
->handle
, &device
->power
.state
);
259 if ((state
== device
->power
.state
) && !device
->flags
.force_power_state
) {
260 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at D%d\n",
265 if (!device
->power
.states
[state
].flags
.valid
) {
266 printk(KERN_WARNING PREFIX
"Device does not support D%d\n", state
);
269 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
270 printk(KERN_WARNING PREFIX
271 "Cannot set device to a higher-powered"
272 " state than parent\n");
279 * On transitions to a high-powered state we first apply power (via
280 * power resources) then evalute _PSx. Conversly for transitions to
281 * a lower-powered state.
283 if (state
< device
->power
.state
) {
284 if (device
->power
.flags
.power_resources
) {
285 result
= acpi_power_transition(device
, state
);
289 if (device
->power
.states
[state
].flags
.explicit_set
) {
290 status
= acpi_evaluate_object(device
->handle
,
291 object_name
, NULL
, NULL
);
292 if (ACPI_FAILURE(status
)) {
298 if (device
->power
.states
[state
].flags
.explicit_set
) {
299 status
= acpi_evaluate_object(device
->handle
,
300 object_name
, NULL
, NULL
);
301 if (ACPI_FAILURE(status
)) {
306 if (device
->power
.flags
.power_resources
) {
307 result
= acpi_power_transition(device
, state
);
315 printk(KERN_WARNING PREFIX
316 "Device [%s] failed to transition to D%d\n",
317 device
->pnp
.bus_id
, state
);
319 device
->power
.state
= state
;
320 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
321 "Device [%s] transitioned to D%d\n",
322 device
->pnp
.bus_id
, state
));
328 EXPORT_SYMBOL(acpi_bus_set_power
);
330 bool acpi_bus_power_manageable(acpi_handle handle
)
332 struct acpi_device
*device
;
335 result
= acpi_bus_get_device(handle
, &device
);
336 return result
? false : device
->flags
.power_manageable
;
339 EXPORT_SYMBOL(acpi_bus_power_manageable
);
341 bool acpi_bus_can_wakeup(acpi_handle handle
)
343 struct acpi_device
*device
;
346 result
= acpi_bus_get_device(handle
, &device
);
347 return result
? false : device
->wakeup
.flags
.valid
;
350 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
352 /* --------------------------------------------------------------------------
354 -------------------------------------------------------------------------- */
356 #ifdef CONFIG_ACPI_PROC_EVENT
357 static DEFINE_SPINLOCK(acpi_bus_event_lock
);
359 LIST_HEAD(acpi_bus_event_list
);
360 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue
);
362 extern int event_is_open
;
364 int acpi_bus_generate_proc_event4(const char *device_class
, const char *bus_id
, u8 type
, int data
)
366 struct acpi_bus_event
*event
;
367 unsigned long flags
= 0;
369 /* drop event on the floor if no one's listening */
373 event
= kmalloc(sizeof(struct acpi_bus_event
), GFP_ATOMIC
);
377 strcpy(event
->device_class
, device_class
);
378 strcpy(event
->bus_id
, bus_id
);
382 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
383 list_add_tail(&event
->node
, &acpi_bus_event_list
);
384 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
386 wake_up_interruptible(&acpi_bus_event_queue
);
392 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4
);
394 int acpi_bus_generate_proc_event(struct acpi_device
*device
, u8 type
, int data
)
398 return acpi_bus_generate_proc_event4(device
->pnp
.device_class
,
399 device
->pnp
.bus_id
, type
, data
);
402 EXPORT_SYMBOL(acpi_bus_generate_proc_event
);
404 int acpi_bus_receive_event(struct acpi_bus_event
*event
)
406 unsigned long flags
= 0;
407 struct acpi_bus_event
*entry
= NULL
;
409 DECLARE_WAITQUEUE(wait
, current
);
415 if (list_empty(&acpi_bus_event_list
)) {
417 set_current_state(TASK_INTERRUPTIBLE
);
418 add_wait_queue(&acpi_bus_event_queue
, &wait
);
420 if (list_empty(&acpi_bus_event_list
))
423 remove_wait_queue(&acpi_bus_event_queue
, &wait
);
424 set_current_state(TASK_RUNNING
);
426 if (signal_pending(current
))
430 spin_lock_irqsave(&acpi_bus_event_lock
, flags
);
431 if (!list_empty(&acpi_bus_event_list
)) {
432 entry
= list_entry(acpi_bus_event_list
.next
,
433 struct acpi_bus_event
, node
);
434 list_del(&entry
->node
);
436 spin_unlock_irqrestore(&acpi_bus_event_lock
, flags
);
441 memcpy(event
, entry
, sizeof(struct acpi_bus_event
));
448 #endif /* CONFIG_ACPI_PROC_EVENT */
450 /* --------------------------------------------------------------------------
451 Notification Handling
452 -------------------------------------------------------------------------- */
454 static void acpi_bus_check_device(acpi_handle handle
)
456 struct acpi_device
*device
;
458 struct acpi_device_status old_status
;
460 if (acpi_bus_get_device(handle
, &device
))
465 old_status
= device
->status
;
468 * Make sure this device's parent is present before we go about
469 * messing with the device.
471 if (device
->parent
&& !device
->parent
->status
.present
) {
472 device
->status
= device
->parent
->status
;
476 status
= acpi_bus_get_status(device
);
477 if (ACPI_FAILURE(status
))
480 if (STRUCT_TO_INT(old_status
) == STRUCT_TO_INT(device
->status
))
484 * Device Insertion/Removal
486 if ((device
->status
.present
) && !(old_status
.present
)) {
487 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device insertion detected\n"));
488 /* TBD: Handle device insertion */
489 } else if (!(device
->status
.present
) && (old_status
.present
)) {
490 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device removal detected\n"));
491 /* TBD: Handle device removal */
495 static void acpi_bus_check_scope(acpi_handle handle
)
498 acpi_bus_check_device(handle
);
501 * TBD: Enumerate child devices within this device's scope and
502 * run acpi_bus_check_device()'s on them.
506 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list
);
507 int register_acpi_bus_notifier(struct notifier_block
*nb
)
509 return blocking_notifier_chain_register(&acpi_bus_notify_list
, nb
);
511 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier
);
513 void unregister_acpi_bus_notifier(struct notifier_block
*nb
)
515 blocking_notifier_chain_unregister(&acpi_bus_notify_list
, nb
);
517 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier
);
522 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
524 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
526 struct acpi_device
*device
= NULL
;
527 struct acpi_driver
*driver
;
529 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Notification %#02x to handle %p\n",
532 blocking_notifier_call_chain(&acpi_bus_notify_list
,
533 type
, (void *)handle
);
537 case ACPI_NOTIFY_BUS_CHECK
:
538 acpi_bus_check_scope(handle
);
540 * TBD: We'll need to outsource certain events to non-ACPI
541 * drivers via the device manager (device.c).
545 case ACPI_NOTIFY_DEVICE_CHECK
:
546 acpi_bus_check_device(handle
);
548 * TBD: We'll need to outsource certain events to non-ACPI
549 * drivers via the device manager (device.c).
553 case ACPI_NOTIFY_DEVICE_WAKE
:
557 case ACPI_NOTIFY_EJECT_REQUEST
:
561 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
562 /* TBD: Exactly what does 'light' mean? */
565 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
569 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
573 case ACPI_NOTIFY_POWER_FAULT
:
578 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
579 "Received unknown/unsupported notification [%08x]\n",
584 acpi_bus_get_device(handle
, &device
);
586 driver
= device
->driver
;
587 if (driver
&& driver
->ops
.notify
&&
588 (driver
->flags
& ACPI_DRIVER_ALL_NOTIFY_EVENTS
))
589 driver
->ops
.notify(device
, type
);
593 /* --------------------------------------------------------------------------
594 Initialization/Cleanup
595 -------------------------------------------------------------------------- */
597 static int __init
acpi_bus_init_irq(void)
599 acpi_status status
= AE_OK
;
600 union acpi_object arg
= { ACPI_TYPE_INTEGER
};
601 struct acpi_object_list arg_list
= { 1, &arg
};
602 char *message
= NULL
;
606 * Let the system know what interrupt model we are using by
607 * evaluating the \_PIC object, if exists.
610 switch (acpi_irq_model
) {
611 case ACPI_IRQ_MODEL_PIC
:
614 case ACPI_IRQ_MODEL_IOAPIC
:
617 case ACPI_IRQ_MODEL_IOSAPIC
:
620 case ACPI_IRQ_MODEL_PLATFORM
:
621 message
= "platform specific model";
624 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
628 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
630 arg
.integer
.value
= acpi_irq_model
;
632 status
= acpi_evaluate_object(NULL
, "\\_PIC", &arg_list
, NULL
);
633 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
634 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
641 u8 acpi_gbl_permanent_mmap
;
644 void __init
acpi_early_init(void)
646 acpi_status status
= AE_OK
;
651 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
653 /* enable workarounds, unless strict ACPI spec. compliance */
655 acpi_gbl_enable_interpreter_slack
= TRUE
;
657 acpi_gbl_permanent_mmap
= 1;
659 status
= acpi_reallocate_root_table();
660 if (ACPI_FAILURE(status
)) {
661 printk(KERN_ERR PREFIX
662 "Unable to reallocate ACPI tables\n");
666 status
= acpi_initialize_subsystem();
667 if (ACPI_FAILURE(status
)) {
668 printk(KERN_ERR PREFIX
669 "Unable to initialize the ACPI Interpreter\n");
673 status
= acpi_load_tables();
674 if (ACPI_FAILURE(status
)) {
675 printk(KERN_ERR PREFIX
676 "Unable to load the System Description Tables\n");
682 /* compatible (0) means level (3) */
683 if (!(acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
)) {
684 acpi_sci_flags
&= ~ACPI_MADT_TRIGGER_MASK
;
685 acpi_sci_flags
|= ACPI_MADT_TRIGGER_LEVEL
;
687 /* Set PIC-mode SCI trigger type */
688 acpi_pic_sci_set_trigger(acpi_gbl_FADT
.sci_interrupt
,
689 (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2);
692 * now that acpi_gbl_FADT is initialized,
693 * update it with result from INT_SRC_OVR parsing
695 acpi_gbl_FADT
.sci_interrupt
= acpi_sci_override_gsi
;
700 acpi_enable_subsystem(~
701 (ACPI_NO_HARDWARE_INIT
|
702 ACPI_NO_ACPI_ENABLE
));
703 if (ACPI_FAILURE(status
)) {
704 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
715 static int __init
acpi_bus_init(void)
718 acpi_status status
= AE_OK
;
719 extern acpi_status
acpi_os_initialize1(void);
721 acpi_os_initialize1();
724 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT
| ACPI_NO_ACPI_ENABLE
);
725 if (ACPI_FAILURE(status
)) {
726 printk(KERN_ERR PREFIX
727 "Unable to start the ACPI Interpreter\n");
732 * ACPI 2.0 requires the EC driver to be loaded and work before
733 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
736 * This is accomplished by looking for the ECDT table, and getting
737 * the EC parameters out of that.
739 status
= acpi_ec_ecdt_probe();
740 /* 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");
749 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
750 * is necessary to enable it as early as possible.
752 acpi_boot_ec_enable();
754 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
756 /* Initialize sleep structures */
760 * Get the system interrupt model and evaluate \_PIC.
762 result
= acpi_bus_init_irq();
767 * Register the for all standard device notifications.
770 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
771 &acpi_bus_notify
, NULL
);
772 if (ACPI_FAILURE(status
)) {
773 printk(KERN_ERR PREFIX
774 "Unable to register for device notifications\n");
779 * Create the top ACPI proc directory
781 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
785 /* Mimic structured exception handling */
791 struct kobject
*acpi_kobj
;
793 static int __init
acpi_init(void)
799 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
803 acpi_kobj
= kobject_create_and_add("acpi", firmware_kobj
);
805 printk(KERN_WARNING
"%s: kset create error\n", __func__
);
809 init_acpi_device_notify();
810 result
= acpi_bus_init();
813 pci_mmcfg_late_init();
814 if (!(pm_flags
& PM_APM
))
817 printk(KERN_INFO PREFIX
818 "APM is already active, exiting\n");
829 * If the laptop falls into the DMI check table, the power state check
830 * will be disabled in the course of device power transistion.
832 dmi_check_system(power_nocheck_dmi_table
);
839 acpi_sleep_proc_init();
840 acpi_wakeup_device_init();
844 subsys_initcall(acpi_init
);