path: root/drivers/acpi/hotkey.c

/*
 *  hotkey.c - ACPI Hotkey Driver ($Revision: 0.2 $)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@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/sched.h>
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>

#define HOTKEY_ACPI_VERSION "0.1"

#define HOTKEY_PROC "hotkey"
#define HOTKEY_EV_CONFIG    "event_config"
#define HOTKEY_PL_CONFIG    "poll_config"
#define HOTKEY_ACTION   "action"
#define HOTKEY_INFO "info"

#define ACPI_HOTK_NAME          "Generic Hotkey Driver"
#define ACPI_HOTK_CLASS         "Hotkey"
#define ACPI_HOTK_DEVICE_NAME   "Hotkey"
#define ACPI_HOTK_HID           "Unknown?"
#define ACPI_HOTKEY_COMPONENT   0x20000000

#define ACPI_HOTKEY_EVENT   0x1
#define ACPI_HOTKEY_POLLING 0x2
#define ACPI_UNDEFINED_EVENT    0xf

#define RESULT_STR_LEN	    80

#define ACTION_METHOD	0
#define POLL_METHOD	1

#define IS_EVENT(e)       	((e) <= 10000 && (e) >0)
#define IS_POLL(e)      	((e) > 10000)
#define IS_OTHERS(e)		((e)<=0 || (e)>=20000)
#define _COMPONENT              ACPI_HOTKEY_COMPONENT
ACPI_MODULE_NAME("acpi_hotkey")

MODULE_AUTHOR("luming.yu@intel.com");
MODULE_DESCRIPTION(ACPI_HOTK_NAME);
MODULE_LICENSE("GPL");

/*  standardized internal hotkey number/event  */
enum {
	/* Video Extension event */
	HK_EVENT_CYCLE_OUTPUT_DEVICE = 0x80,
	HK_EVENT_OUTPUT_DEVICE_STATUS_CHANGE,
	HK_EVENT_CYCLE_DISPLAY_OUTPUT,
	HK_EVENT_NEXT_DISPLAY_OUTPUT,
	HK_EVENT_PREVIOUS_DISPLAY_OUTPUT,
	HK_EVENT_CYCLE_BRIGHTNESS,
	HK_EVENT_INCREASE_BRIGHTNESS,
	HK_EVENT_DECREASE_BRIGHTNESS,
	HK_EVENT_ZERO_BRIGHTNESS,
	HK_EVENT_DISPLAY_DEVICE_OFF,

	/* Snd Card event */
	HK_EVENT_VOLUME_MUTE,
	HK_EVENT_VOLUME_INCLREASE,
	HK_EVENT_VOLUME_DECREASE,

	/* running state control */
	HK_EVENT_ENTERRING_S3,
	HK_EVENT_ENTERRING_S4,
	HK_EVENT_ENTERRING_S5,
};

/*  procdir we use */
static struct proc_dir_entry *hotkey_proc_dir;
static struct proc_dir_entry *hotkey_config;
static struct proc_dir_entry *hotkey_poll_config;
static struct proc_dir_entry *hotkey_action;
static struct proc_dir_entry *hotkey_info;

/* linkage for all type of hotkey */
struct acpi_hotkey_link {
	struct list_head entries;
	int hotkey_type;	/* event or polling based hotkey  */
	int hotkey_standard_num;	/* standardized hotkey(event) number */
};

/* event based hotkey */
struct acpi_event_hotkey {
	struct acpi_hotkey_link hotkey_link;
	int flag;
	acpi_handle bus_handle;	/* bus to install notify handler */
	int external_hotkey_num;	/* external hotkey/event number */
	acpi_handle action_handle;	/* acpi handle attached aml action method */
	char *action_method;	/* action method */
};

/*
 * There are two ways to poll status
 * 1. directy call read_xxx method, without any arguments passed in
 * 2. call write_xxx method, with arguments passed in, you need
 * the result is saved in acpi_polling_hotkey.poll_result.
 * anthoer read command through polling interface.
 *
 */

/* polling based hotkey */
struct acpi_polling_hotkey {
	struct acpi_hotkey_link hotkey_link;
	int flag;
	acpi_handle poll_handle;	/* acpi handle attached polling method */
	char *poll_method;	/* poll method */
	acpi_handle action_handle;	/* acpi handle attached action method */
	char *action_method;	/* action method */
	union acpi_object *poll_result;	/* polling_result */
	struct proc_dir_entry *proc;
};

/* hotkey object union */
union acpi_hotkey {
	struct list_head entries;
	struct acpi_hotkey_link link;
	struct acpi_event_hotkey event_hotkey;
	struct acpi_polling_hotkey poll_hotkey;
};

/* hotkey object list */
struct acpi_hotkey_list {
	struct list_head *entries;
	int count;
};

static int auto_hotkey_add(struct acpi_device *device);
static int auto_hotkey_remove(struct acpi_device *device, int type);

static struct acpi_driver hotkey_driver = {
	.name = ACPI_HOTK_NAME,
	.class = ACPI_HOTK_CLASS,
	.ids = ACPI_HOTK_HID,
	.ops = {
		.add = auto_hotkey_add,
		.remove = auto_hotkey_remove,
		},
};

static void free_hotkey_device(union acpi_hotkey *key);
static void free_hotkey_buffer(union acpi_hotkey *key);
static void free_poll_hotkey_buffer(union acpi_hotkey *key);
static int hotkey_open_config(struct inode *inode, struct file *file);
static int hotkey_poll_open_config(struct inode *inode, struct file *file