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kernel_optimize_test/drivers/acpi/button.c
Dmitry Torokhov c0968f0ea2 ACPI: button: register with input layer 
In addition to signalling button/lid events through /proc/acpi/event,
create separate input devices and report KEY_POWER, KEY_SLEEP and
SW_LID through input layer.  Also remove unnecessary casts and variable
initializations, clean up formatting.

Sleep button may autorepeat but userspace will have to filter duplicate
sleep requests anyway (and discard unprocessed events right after
wakeup).

Unlike /proc/acpi/event interface input device corresponding to LID
switch reports true lid state instead of just a counter. SW_LID is
active when lid is closed.

The driver now depends on CONFIG_INPUT.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-11-09 03:20:19 -05:00

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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 <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/input.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_FILE_INFO "info"
#define ACPI_BUTTON_FILE_STATE "state"
#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
#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 int acpi_button_info_open_fs(struct inode *inode, struct file *file);
static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
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 {
struct acpi_device *device; /* Fixed button kludge */
unsigned int type;
struct input_dev *input;
char phys[32]; /* for input device */
unsigned long pushed;
};
static const struct file_operations acpi_button_info_fops = {
.open = acpi_button_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations acpi_button_state_fops = {
.open = acpi_button_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_button_dir;
static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_button *button = seq->private;
if (!button || !button->device)
return 0;
seq_printf(seq, "type: %s\n",
acpi_device_name(button->device));
return 0;
}
static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
}
static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_button *button = seq->private;
acpi_status status;
unsigned long state;
if (!button || !button->device)
return 0;
status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
seq_printf(seq, "state: %s\n",
ACPI_FAILURE(status) ? "unsupported" :
(state ? "open" : "closed"));
return 0;
}
static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
}
static struct proc_dir_entry *acpi_power_dir;
static struct proc_dir_entry *acpi_sleep_dir;
static struct proc_dir_entry *acpi_lid_dir;
static int acpi_button_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
struct acpi_button *button;
if (!device || !acpi_driver_data(device))
return -EINVAL;
button = acpi_driver_data(device);
switch (button->type) {
case ACPI_BUTTON_TYPE_POWER:
case ACPI_BUTTON_TYPE_POWERF:
if (!acpi_power_dir)
acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
acpi_button_dir);
entry = acpi_power_dir;
break;
case ACPI_BUTTON_TYPE_SLEEP:
case ACPI_BUTTON_TYPE_SLEEPF:
if (!acpi_sleep_dir)
acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
acpi_button_dir);
entry = acpi_sleep_dir;
break;
case ACPI_BUTTON_TYPE_LID:
if (!acpi_lid_dir)
acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
acpi_button_dir);
entry = acpi_lid_dir;
break;
}
if (!entry)
return -ENODEV;
entry->owner = THIS_MODULE;
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
if (!acpi_device_dir(device))
return -ENODEV;
acpi_device_dir(device)->owner = THIS_MODULE;
/* 'info' [R] */
entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_button_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* show lid state [R] */
if (button->type == ACPI_BUTTON_TYPE_LID) {
entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_button_state_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
}
return 0;
}
static int acpi_button_remove_fs(struct acpi_device *device)
{
struct acpi_button *button = acpi_driver_data(device);
if (acpi_device_dir(device)) {
if (button->type == ACPI_BUTTON_TYPE_LID)
remove_proc_entry(ACPI_BUTTON_FILE_STATE,
acpi_device_dir(device));
remove_proc_entry(ACPI_BUTTON_FILE_INFO,
acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device),
acpi_device_dir(device)->parent);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_button *button = data;
struct input_dev *input;
if (!button || !button->device)
return;
switch (event) {
case ACPI_BUTTON_NOTIFY_STATUS:
input = button->input;
if (button->type == ACPI_BUTTON_TYPE_LID) {
struct acpi_handle *handle = button->device->handle;
unsigned long state;
if (!ACPI_FAILURE(acpi_evaluate_integer(handle, "_LID",
NULL, &state)))
input_report_switch(input, SW_LID, !state);
} else {
int keycode = test_bit(KEY_SLEEP, input->keybit) ?
KEY_SLEEP : KEY_POWER;
input_report_key(input, keycode, 1);
input_sync(input);
input_report_key(input, keycode, 0);
}
input_sync(input);
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;
}
static acpi_status acpi_button_notify_fixed(void *data)
{
struct acpi_button *button = data;
if (!button)
return AE_BAD_PARAMETER;
acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
return AE_OK;
}
static int acpi_button_install_notify_handlers(struct acpi_button *button)
{
acpi_status status;
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->device->handle,
ACPI_DEVICE_NOTIFY,
acpi_button_notify,
button);
break;
}
return ACPI_FAILURE(status) ? -ENODEV : 0;
}
static void acpi_button_remove_notify_handlers(struct acpi_button *button)
{
switch (button->type) {
case ACPI_BUTTON_TYPE_POWERF:
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_button_notify_fixed);
break;
case ACPI_BUTTON_TYPE_SLEEPF:
acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
acpi_button_notify_fixed);
break;
default:
acpi_remove_notify_handler(button->device->handle,
ACPI_DEVICE_NOTIFY,
acpi_button_notify);
break;
}
}
static int acpi_button_add(struct acpi_device *device)
{
int error;
struct acpi_button *button;
struct input_dev *input;
if (!device)
return -EINVAL;
button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
if (!button)
return -ENOMEM;
button->device = device;
acpi_driver_data(device) = button;
button->input = input = input_allocate_device();
if (!input) {
error = -ENOMEM;
goto err_free_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 {
printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
acpi_device_hid(device));
error = -ENODEV;
goto err_free_input;
}
error = acpi_button_add_fs(device);
if (error)
goto err_free_input;
error = acpi_button_install_notify_handlers(button);
if (error)
goto err_remove_fs;
snprintf(button->phys, sizeof(button->phys),
"%s/button/input0", acpi_device_hid(device));
input->name = acpi_device_name(device);
input->phys = button->phys;
input->id.bustype = BUS_HOST;
input->id.product = button->type;
switch (button->type) {
case ACPI_BUTTON_TYPE_POWER:
case ACPI_BUTTON_TYPE_POWERF:
input->evbit[0] = BIT(EV_KEY);
set_bit(KEY_POWER, input->keybit);
break;
case ACPI_BUTTON_TYPE_SLEEP:
case ACPI_BUTTON_TYPE_SLEEPF:
input->evbit[0] = BIT(EV_KEY);
set_bit(KEY_SLEEP, input->keybit);
break;
case ACPI_BUTTON_TYPE_LID:
input->evbit[0] = BIT(EV_SW);
set_bit(SW_LID, input->swbit);
break;
}
error = input_register_device(input);
if (error)
goto err_remove_handlers;
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));
return 0;
err_remove_handlers:
acpi_button_remove_notify_handlers(button);
err_remove_fs:
acpi_button_remove_fs(device);
err_free_input:
input_free_device(input);
err_free_button:
kfree(button);
return error;
}
static int acpi_button_remove(struct acpi_device *device, int type)
{
struct acpi_button *button;
if (!device || !acpi_driver_data(device))
return -EINVAL;
button = acpi_driver_data(device);
acpi_button_remove_notify_handlers(button);
acpi_button_remove_fs(device);
input_unregister_device(button->input);
kfree(button);
return 0;
}
static int __init acpi_button_init(void)
{
int result;
acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
if (!acpi_button_dir)
return -ENODEV;
acpi_button_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_button_driver);
if (result < 0) {
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
return -ENODEV;
}
return 0;
}
static void __exit acpi_button_exit(void)
{
acpi_bus_unregister_driver(&acpi_button_driver);
if (acpi_power_dir)
remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
if (acpi_sleep_dir)
remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
if (acpi_lid_dir)
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
}
module_init(acpi_button_init);
module_exit(acpi_button_exit);
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