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106c19e7b9
linux/drivers/acpi/button.c
Bjorn Helgaas 106c19e7b9 ACPI: button: remove button->device pointer 
We no longer need a pointer from struct acpi_button back to the
struct acpi_device.  Everywhere we used that pointer, we either
already have, or can easily get, the acpi_device pointer without
using the copy from acpi_button.  So this patch removes the
structure element.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-04-11 00:36:40 -04:00

454 lines
13 KiB
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/*
* button.c - ACPI Button Driver
*
* 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_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("button");
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Button Driver");
MODULE_LICENSE("GPL");
static const struct acpi_device_id button_device_ids[] = {
{ACPI_BUTTON_HID_LID, 0},
{ACPI_BUTTON_HID_SLEEP, 0},
{ACPI_BUTTON_HID_SLEEPF, 0},
{ACPI_BUTTON_HID_POWER, 0},
{ACPI_BUTTON_HID_POWERF, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, button_device_ids);
static int acpi_button_add(struct acpi_device *device);
static int acpi_button_remove(struct acpi_device *device, int type);
static int acpi_button_resume(struct acpi_device *device);
static void acpi_button_notify(struct acpi_device *device, u32 event);
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 = "button",
.class = ACPI_BUTTON_CLASS,
.ids = button_device_ids,
.ops = {
.add = acpi_button_add,
.resume = acpi_button_resume,
.remove = acpi_button_remove,
.notify = acpi_button_notify,
},
};
struct acpi_button {
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 = {
.owner = THIS_MODULE,
.open = acpi_button_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations acpi_button_state_fops = {
.owner = THIS_MODULE,
.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_device *device = seq->private;
seq_printf(seq, "type: %s\n",
acpi_device_name(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_device *device = seq->private;
acpi_status status;
unsigned long long state;
status = acpi_evaluate_integer(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 acpi_button *button = acpi_driver_data(device);
struct proc_dir_entry *entry = NULL;
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;
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
if (!acpi_device_dir(device))
return -ENODEV;
/* 'info' [R] */
entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
S_IRUGO, acpi_device_dir(device),
&acpi_button_info_fops, device);
if (!entry)
return -ENODEV;
/* show lid state [R] */
if (button->type == ACPI_BUTTON_TYPE_LID) {
entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
S_IRUGO, acpi_device_dir(device),
&acpi_button_state_fops, device);
if (!entry)
return -ENODEV;
}
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 int acpi_lid_send_state(struct acpi_device *device)
{
struct acpi_button *button = acpi_driver_data(device);
unsigned long long state;
acpi_status status;
status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
if (ACPI_FAILURE(status))
return -ENODEV;
/* input layer checks if event is redundant */
input_report_switch(button->input, SW_LID, !state);
input_sync(button->input);
return 0;
}
static void acpi_button_notify(struct acpi_device *device, u32 event)
{
struct acpi_button *button = acpi_driver_data(device);
struct input_dev *input;
switch (event) {
case ACPI_FIXED_HARDWARE_EVENT:
event = ACPI_BUTTON_NOTIFY_STATUS;
/* fall through */
case ACPI_BUTTON_NOTIFY_STATUS:
input = button->input;
if (button->type == ACPI_BUTTON_TYPE_LID) {
acpi_lid_send_state(device);
} 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_proc_event(device, event, ++button->pushed);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
}
static int acpi_button_resume(struct acpi_device *device)
{
struct acpi_button *button = acpi_driver_data(device);
if (button->type == ACPI_BUTTON_TYPE_LID)
return acpi_lid_send_state(device);
return 0;
}
static int acpi_button_add(struct acpi_device *device)
{
struct acpi_button *button;
struct input_dev *input;
char *hid, *name, *class;
int error;
button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
if (!button)
return -ENOMEM;
device->driver_data = button;
button->input = input = input_allocate_device();
if (!input) {
error = -ENOMEM;
goto err_free_button;
}
hid = acpi_device_hid(device);
name = acpi_device_name(device);
class = acpi_device_class(device);
/*
* Determine the button type (via hid), as fixed-feature buttons
* need to be handled a bit differently than generic-space.
*/
if (!strcmp(hid, ACPI_BUTTON_HID_POWER)) {
button->type = ACPI_BUTTON_TYPE_POWER;
strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
} else if (!strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
button->type = ACPI_BUTTON_TYPE_POWERF;
strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWERF);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP)) {
button->type = ACPI_BUTTON_TYPE_SLEEP;
strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
button->type = ACPI_BUTTON_TYPE_SLEEPF;
strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEPF);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
button->type = ACPI_BUTTON_TYPE_LID;
strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
sprintf(class, "%s/%s",
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
} else {
printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
error = -ENODEV;
goto err_free_input;
}
error = acpi_button_add_fs(device);
if (error)
goto err_free_input;
snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
input->name = name;
input->phys = button->phys;
input->id.bustype = BUS_HOST;
input->id.product = button->type;
input->dev.parent = &device->dev;
switch (button->type) {
case ACPI_BUTTON_TYPE_POWER:
case ACPI_BUTTON_TYPE_POWERF:
input->evbit[0] = BIT_MASK(EV_KEY);
set_bit(KEY_POWER, input->keybit);
break;
case ACPI_BUTTON_TYPE_SLEEP:
case ACPI_BUTTON_TYPE_SLEEPF:
input->evbit[0] = BIT_MASK(EV_KEY);
set_bit(KEY_SLEEP, input->keybit);
break;
case ACPI_BUTTON_TYPE_LID:
input->evbit[0] = BIT_MASK(EV_SW);
set_bit(SW_LID, input->swbit);
break;
}
error = input_register_device(input);
if (error)
goto err_remove_fs;
if (button->type == ACPI_BUTTON_TYPE_LID)
acpi_lid_send_state(device);
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);
device->wakeup.state.enabled = 1;
}
printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
return 0;
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 = acpi_driver_data(device);
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;
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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