path: root/drivers/misc/asus-laptop.c

/*
 *  asus-laptop.c - Asus Laptop Support
 *
 *
 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
 *  Copyright (C) 2006 Corentin Chary
 *
 *  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
 *
 *
 *  The development page for this driver is located at
 *  http://sourceforge.net/projects/acpi4asus/
 *
 *  Credits:
 *  Pontus Fuchs   - Helper functions, cleanup
 *  Johann Wiesner - Small compile fixes
 *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
 *  Eric Burghard  - LED display support for W1N
 *  Josh Green     - Light Sens support
 *  Thomas Tuttle  - His first patch for led support was very helpfull
 *
 */

#include <linux/autoconf.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>

#define ASUS_LAPTOP_VERSION "0.40"

#define ASUS_HOTK_NAME          "Asus Laptop Support"
#define ASUS_HOTK_CLASS         "hotkey"
#define ASUS_HOTK_DEVICE_NAME   "Hotkey"
#define ASUS_HOTK_HID           "ATK0100"
#define ASUS_HOTK_FILE          "asus-laptop"
#define ASUS_HOTK_PREFIX        "\\_SB.ATKD."

/*
 * Known bits returned by \_SB.ATKD.HWRS
 */
#define WL_HWRS     0x80
#define BT_HWRS     0x100

/*
 * Flags for hotk status
 * WL_ON and BT_ON are also used for wireless_status()
 */
#define WL_ON       0x01	//internal Wifi
#define BT_ON       0x02	//internal Bluetooth
#define MLED_ON     0x04	//mail LED
#define TLED_ON     0x08	//touchpad LED
#define RLED_ON     0x10        //Record LED
#define PLED_ON     0x20        //Phone LED

#define ASUS_LOG    ASUS_HOTK_FILE ": "
#define ASUS_ERR    KERN_ERR    ASUS_LOG
#define ASUS_WARNING    KERN_WARNING    ASUS_LOG
#define ASUS_NOTICE KERN_NOTICE ASUS_LOG
#define ASUS_INFO   KERN_INFO   ASUS_LOG
#define ASUS_DEBUG  KERN_DEBUG  ASUS_LOG

MODULE_AUTHOR("Julien Lerouge, Karol Kozimor, Corentin Chary");
MODULE_DESCRIPTION(ASUS_HOTK_NAME);
MODULE_LICENSE("GPL");

#define ASUS_HANDLE(object, paths...)					\
	static acpi_handle  object##_handle = NULL;			\
	static char *object##_paths[] = { paths }

/* LED */
ASUS_HANDLE(mled_set, ASUS_HOTK_PREFIX "MLED");
ASUS_HANDLE(tled_set, ASUS_HOTK_PREFIX "TLED");
ASUS_HANDLE(rled_set, ASUS_HOTK_PREFIX "RLED"); /* W1JC */
ASUS_HANDLE(pled_set, ASUS_HOTK_PREFIX "PLED"); /* A7J */

/* Bluetooth and WLAN
 * WLED and BLED are not handled like other XLED, because in some dsdt
 * they also control the WLAN/Bluetooth device.
 */
ASUS_HANDLE(wl_switch, ASUS_HOTK_PREFIX "WLED");
ASUS_HANDLE(bt_switch, ASUS_HOTK_PREFIX "BLED");
ASUS_HANDLE(wireless_status, ASUS_HOTK_PREFIX "RSTS"); /* All new models */

/*
 * This is the main structure, we can use it to store anything interesting
 * about the hotk device
 */
struct asus_hotk {
	char *name; //laptop name
	struct acpi_device *device;	//the device we are in
	acpi_handle handle;	//the handle of the hotk device
	char status;		//status of the hotk, for LEDs, ...
	u16 event_count[128];	//count for each event TODO make this better
};

/*
 * This header is made available to allow proper configuration given model,
 * revision number , ... this info cannot go in struct asus_hotk because it is
 * available before the hotk
 */
static struct acpi_table_header *asus_info;

/* The actual device the driver binds to */
static struct asus_hotk *hotk;

/*
 * The hotkey driver declaration
 */
static int asus_hotk_add(struct acpi_device *device);
static int asus_hotk_remove(struct acpi_device *device, int type);
static struct acpi_driver asus_hotk_driver = {
	.name = ASUS_HOTK_NAME,
	.class = ASUS_HOTK_CLASS,
	.ids = ASUS_HOTK_HID,
	.ops = {
		.add = asus_hotk_add,
		.remove = asus_hotk_remove,
		},
};

/* These functions actually update the LED's, and are called from a
 * workqueue. By doing this as separate work rather than when the LED
 * subsystem asks, we avoid messing with the Asus ACPI stuff during a
 * potentially bad time, such as a timer interrupt. */
static struct workqueue_struct *led_workqueue;

#define ASUS_LED(object, ledname)					\
	static void object##_led_set(struct led_classdev *led_cdev,	\
				     enum led_brightness value);	\
	static void object##_led_update(struct work_struct *ignored);	\
	static int object##_led_wk;					\
	DECLARE_WORK(object##_led_work, object##_led_update);		\
	static struct led_classdev object##_led = {			\
		.name           = "asus:" ledname,			\
		.brightness_set = object##_led_set,			\
	}

ASUS_LED(mled, "mail");
ASUS_LED(tled, "touchpad");
ASUS_LED(rled, "record");
ASUS_LED(pled, "phone");

/*
 * This function evaluates an ACPI method, given an int as parameter, the
 * method is searched within the scope of the handle, can be NULL. The output
 * of the method is written is output, which can also be NULL
 *
 * returns 1 if write is successful, 0 else.
 */
static int write_acpi_int(acpi_handle handle, const char *method, int val,
			  struct acpi_buffer *output)
{
	struct acpi_object_list params;	//list of input parameters (an int here)
	union acpi_object in_obj;	//the only param we use
	acpi_status status;

	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = val;

	status = acpi_evaluate_object(handle, (char *)method, &params, output);
	return (status == AE_OK);
}

static int read_acpi_int(acpi_handle handle, const char *method, int *val,
			 struct acpi_object_list *params)
{
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, (char *)method, params, &output);
	*val = out_obj.integer.value;
	return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
}

static int read_wireless_status(int mask) {
	int status;

	if (!wireless_status_handle)
		return (hotk->status & mask) ? 1 : 0;

	if (read_acpi_int(wireless_status_handle, NULL, &status, NULL)) {
		return (status & mask) ? 1 : 0;
	} else
		printk(ASUS_WARNING "Error reading Wireless status\n");

	return (hotk->status & mask) ? 1 : 0;
}

/* Generic LED functions */
static int read_status(int mask)
{
	/* There is a special method for both wireless devices */
	if (mask == BT_ON || mask == WL_ON)
		return read_wireless_status(mask);

	return (hotk->status & mask) ? 1 : 0;
}

static void write_status(acpi_handle handle, int out, int mask,
			 int invert)
{
	hotk->status = (out) ? (hotk->status | mask) : (hotk->status & ~mask);

	if (invert)		/* invert target value */
		out = !out & 0x1;

	if (handle && !write_acpi_int(handle, NULL, out, NULL))
		printk(ASUS_WARNING " write failed\n");
}