linux/drivers/acpi/button.c

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/*
* acpi_button.c - ACPI Button Driver ($Revision: 30 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define ACPI_BUTTON_COMPONENT 0x00080000
#define ACPI_BUTTON_DRIVER_NAME "ACPI Button Driver"
#define ACPI_BUTTON_CLASS "button"
#define ACPI_BUTTON_NOTIFY_STATUS 0x80
#define ACPI_BUTTON_SUBCLASS_POWER "power"
#define ACPI_BUTTON_HID_POWER "PNP0C0C"
#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button (CM)"
#define ACPI_BUTTON_DEVICE_NAME_POWERF "Power Button (FF)"
#define ACPI_BUTTON_TYPE_POWER 0x01
#define ACPI_BUTTON_TYPE_POWERF 0x02
#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button (CM)"
#define ACPI_BUTTON_DEVICE_NAME_SLEEPF "Sleep Button (FF)"
#define ACPI_BUTTON_TYPE_SLEEP 0x03
#define ACPI_BUTTON_TYPE_SLEEPF 0x04
#define ACPI_BUTTON_SUBCLASS_LID "lid"
#define ACPI_BUTTON_HID_LID "PNP0C0D"
#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
#define ACPI_BUTTON_TYPE_LID 0x05
#define _COMPONENT ACPI_BUTTON_COMPONENT
ACPI_MODULE_NAME ("acpi_button")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int acpi_button_add (struct acpi_device *device);
static int acpi_button_remove (struct acpi_device *device, int type);
static struct acpi_driver acpi_button_driver = {
.name = ACPI_BUTTON_DRIVER_NAME,
.class = ACPI_BUTTON_CLASS,
.ids = "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E",
.ops = {
.add = acpi_button_add,
.remove = acpi_button_remove,
},
};
struct acpi_button {
acpi_handle handle;
struct acpi_device *device; /* Fixed button kludge */
u8 type;
unsigned long pushed;
};
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void
acpi_button_notify (
acpi_handle handle,
u32 event,
void *data)
{
struct acpi_button *button = (struct acpi_button *) data;
ACPI_FUNCTION_TRACE("acpi_button_notify");
if (!button || !button->device)
return_VOID;
switch (event) {
case ACPI_BUTTON_NOTIFY_STATUS:
acpi_bus_generate_event(button->device, event, ++button->pushed);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
static acpi_status
acpi_button_notify_fixed (
void *data)
{
struct acpi_button *button = (struct acpi_button *) data;
ACPI_FUNCTION_TRACE("acpi_button_notify_fixed");
BUG_ON(!button);
acpi_button_notify(button->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
return_ACPI_STATUS(AE_OK);
}
static int
acpi_button_add (
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_button *button = NULL;
ACPI_FUNCTION_TRACE("acpi_button_add");
if (!device)
return_VALUE(-EINVAL);
button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL);
if (!button)
return_VALUE(-ENOMEM);
memset(button, 0, sizeof(struct acpi_button));
button->device = device;
button->handle = device->handle;
acpi_driver_data(device) = button;
/*
* Determine the button type (via hid), as fixed-feature buttons
* need to be handled a bit differently than generic-space.
*/
if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
button->type = ACPI_BUTTON_TYPE_POWER;
strcpy(acpi_device_name(device),
ACPI_BUTTON_DEVICE_NAME_POWER);
sprintf(acpi_device_class(device), "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
}
else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
button->type = ACPI_BUTTON_TYPE_POWERF;
strcpy(acpi_device_name(device),
ACPI_BUTTON_DEVICE_NAME_POWERF);
sprintf(acpi_device_class(device), "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
}
else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
button->type = ACPI_BUTTON_TYPE_SLEEP;
strcpy(acpi_device_name(device),
ACPI_BUTTON_DEVICE_NAME_SLEEP);
sprintf(acpi_device_class(device), "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
}
else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
button->type = ACPI_BUTTON_TYPE_SLEEPF;
strcpy(acpi_device_name(device),
ACPI_BUTTON_DEVICE_NAME_SLEEPF);
sprintf(acpi_device_class(device), "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
}
else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
button->type = ACPI_BUTTON_TYPE_LID;
strcpy(acpi_device_name(device),
ACPI_BUTTON_DEVICE_NAME_LID);
sprintf(acpi_device_class(device), "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
}
else {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported hid [%s]\n",
acpi_device_hid(device)));
result = -ENODEV;
goto end;
}
switch (button->type) {
case ACPI_BUTTON_TYPE_POWERF:
status = acpi_install_fixed_event_handler (
ACPI_EVENT_POWER_BUTTON,
acpi_button_notify_fixed,
button);
break;
case ACPI_BUTTON_TYPE_SLEEPF:
status = acpi_install_fixed_event_handler (
ACPI_EVENT_SLEEP_BUTTON,
acpi_button_notify_fixed,
button);
break;
default:
status = acpi_install_notify_handler (
button->handle,
ACPI_DEVICE_NOTIFY,
acpi_button_notify,
button);
break;
}
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
result = -ENODEV;
goto end;
}
if (device->wakeup.flags.valid) {
/* Button's GPE is run-wake GPE */
acpi_set_gpe_type(device->wakeup.gpe_device,
device->wakeup.gpe_number, ACPI_GPE_TYPE_WAKE_RUN);
acpi_enable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number, ACPI_NOT_ISR);
device->wakeup.state.enabled = 1;
}
printk(KERN_INFO PREFIX "%s [%s]\n",
acpi_device_name(device), acpi_device_bid(device));
end:
if (result) {
kfree(button);
}
return_VALUE(result);
}
static int
acpi_button_remove (struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_button *button = NULL;
ACPI_FUNCTION_TRACE("acpi_button_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
button = acpi_driver_data(device);
/* Unregister for device notifications. */
switch (button->type) {
case ACPI_BUTTON_TYPE_POWERF:
status = acpi_remove_fixed_event_handler(
ACPI_EVENT_POWER_BUTTON, acpi_button_notify_fixed);
break;
case ACPI_BUTTON_TYPE_SLEEPF:
status = acpi_remove_fixed_event_handler(
ACPI_EVENT_SLEEP_BUTTON, acpi_button_notify_fixed);
break;
default:
status = acpi_remove_notify_handler(button->handle,
ACPI_DEVICE_NOTIFY, acpi_button_notify);
break;
}
if (ACPI_FAILURE(status))
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error removing notify handler\n"));
kfree(button);
return_VALUE(0);
}
static int __init
acpi_button_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_button_init");
result = acpi_bus_register_driver(&acpi_button_driver);
if (result < 0) {
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
static void __exit
acpi_button_exit (void)
{
ACPI_FUNCTION_TRACE("acpi_button_exit");
acpi_bus_unregister_driver(&acpi_button_driver);
return_VOID;
}
module_init(acpi_button_init);
module_exit(acpi_button_exit);