asus-laptop.c

linux 内核源代码

/*
 *  asus-laptop.c - Asus Laptop Support
 *
 *
 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
 *  Copyright (C) 2006-2007 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
 *  Sam Lin        - GPS support
 */

#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/backlight.h>
#include <linux/fb.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 "0.42"

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

/*
 * Some events we use, same for all Asus
 */
#define ATKD_BR_UP       0x10
#define ATKD_BR_DOWN     0x20
#define ATKD_LCD_ON      0x33
#define ATKD_LCD_OFF     0x34

/*
 * 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 GLED_ON     0x40	//Gaming LED
#define LCD_ON      0x80	//LCD backlight
#define GPS_ON      0x100	//GPS

#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");

/* WAPF defines the behavior of the Fn+Fx wlan key
 * The significance of values is yet to be found, but
 * most of the time:
 * 0x0 will do nothing
 * 0x1 will allow to control the device with Fn+Fx key.
 * 0x4 will send an ACPI event (0x88) while pressing the Fn+Fx key
 * 0x5 like 0x1 or 0x4
 * So, if something doesn't work as you want, just try other values =)
 */
static uint wapf = 1;
module_param(wapf, uint, 0644);
MODULE_PARM_DESC(wapf, "WAPF value");

#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 */
ASUS_HANDLE(gled_set, ASUS_HOTK_PREFIX "GLED");	/* G1, G2 (probably) */

/* LEDD */
ASUS_HANDLE(ledd_set, ASUS_HOTK_PREFIX "SLCM");

/* 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 */

/* Brightness */
ASUS_HANDLE(brightness_set, ASUS_HOTK_PREFIX "SPLV");
ASUS_HANDLE(brightness_get, ASUS_HOTK_PREFIX "GPLV");

/* Backlight */
ASUS_HANDLE(lcd_switch, "\\_SB.PCI0.SBRG.EC0._Q10",	/* All new models */
	    "\\_SB.PCI0.ISA.EC0._Q10",	/* A1x */
	    "\\_SB.PCI0.PX40.ECD0._Q10",	/* L3C */
	    "\\_SB.PCI0.PX40.EC0.Q10",	/* M1A */
	    "\\_SB.PCI0.LPCB.EC0._Q10",	/* P30 */
	    "\\_SB.PCI0.PX40.Q10",	/* S1x */
	    "\\Q10");		/* A2x, L2D, L3D, M2E */

/* Display */
ASUS_HANDLE(display_set, ASUS_HOTK_PREFIX "SDSP");
ASUS_HANDLE(display_get, "\\_SB.PCI0.P0P1.VGA.GETD",	/*  A6B, A6K A6R A7D F3JM L4R M6R A3G
							   M6A M6V VX-1 V6J V6V W3Z */
	    "\\_SB.PCI0.P0P2.VGA.GETD",	/* A3E A4K, A4D A4L A6J A7J A8J Z71V M9V
					   S5A M5A z33A W1Jc W2V G1 */
	    "\\_SB.PCI0.P0P3.VGA.GETD",	/* A6V A6Q */
	    "\\_SB.PCI0.P0PA.VGA.GETD",	/* A6T, A6M */
	    "\\_SB.PCI0.PCI1.VGAC.NMAP",	/* L3C */
	    "\\_SB.PCI0.VGA.GETD",	/* Z96F */
	    "\\ACTD",		/* A2D */
	    "\\ADVG",		/* A4G Z71A W1N W5A W5F M2N M3N M5N M6N S1N S5N */
	    "\\DNXT",		/* P30 */
	    "\\INFB",		/* A2H D1 L2D L3D L3H L2E L5D L5C M1A M2E L4L W3V */
	    "\\SSTE");		/* A3F A6F A3N A3L M6N W3N W6A */

ASUS_HANDLE(ls_switch, ASUS_HOTK_PREFIX "ALSC");	/* Z71A Z71V */
ASUS_HANDLE(ls_level, ASUS_HOTK_PREFIX "ALSL");	/* Z71A Z71V */

/* GPS */
/* R2H use different handle for GPS on/off */
ASUS_HANDLE(gps_on, ASUS_HOTK_PREFIX "SDON");	/* R2H */
ASUS_HANDLE(gps_off, ASUS_HOTK_PREFIX "SDOF");	/* R2H */
ASUS_HANDLE(gps_status, ASUS_HOTK_PREFIX "GPST");

/*
 * 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, ...
	u32 ledd_status;	//status of the LED display
	u8 light_level;		//light sensor level
	u8 light_switch;	//light sensor switch value
	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 const struct acpi_device_id asus_device_ids[] = {
	{"ATK0100", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, asus_device_ids);

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_device_ids,
	.ops = {
		.add = asus_hotk_add,
		.remove = asus_hotk_remove,
		},
};

/* The backlight device /sys/class/backlight */
static struct backlight_device *asus_backlight_device;

/*
 * The backlight class declaration
 */
static int read_brightness(struct backlight_device *bd);
static int update_bl_status(struct backlight_device *bd);
static struct backlight_ops asusbl_ops = {
	.get_brightness = read_brightness,
	.update_status = update_bl_status,
};

/* 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;					\
	static 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");
ASUS_LED(gled, "gaming");

/*
 * 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_wireless_status(int mask)
{
	ulong status;
	acpi_status rv = AE_OK;

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

	rv = acpi_evaluate_integer(wireless_status_handle, NULL, NULL, &status);
	if (ACPI_FAILURE(rv))
		printk(ASUS_WARNING "Error reading Wireless status\n");
	else
		return (status & mask) ? 1 : 0;

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

static int read_gps_status(void)
{
	ulong status;
	acpi_status rv = AE_OK;

	rv = acpi_evaluate_integer(gps_status_handle, NULL, NULL, &status);
	if (ACPI_FAILURE(rv))
		printk(ASUS_WARNING "Error reading GPS status\n");
	else
		return status ? 1 : 0;

	return (hotk->status & GPS_ON) ? 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);
	else if (mask == GPS_ON)
		return read_gps_status();

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

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

	switch (mask) {
	case MLED_ON:
		out = !out & 0x1;
		break;
	case GLED_ON:
		out = (out & 0x1) + 1;
		break;
	case GPS_ON:
		handle = (out) ? gps_on_handle : gps_off_handle;
		out = 0x02;
		break;
	default:
		out &= 0x1;
		break;
	}

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

/* /sys/class/led handlers */
#define ASUS_LED_HANDLER(object, mask)					\
	static void object##_led_set(struct led_classdev *led_cdev,	\
				     enum led_brightness value)		\
	{								\
		object##_led_wk = value;				\
		queue_work(led_workqueue, &object##_led_work);		\
	}								\
	static void object##_led_update(struct work_struct *ignored)	\
	{								\
		int value = object##_led_wk;				\
		write_status(object##_set_handle, value, (mask));	\
	}

ASUS_LED_HANDLER(mled, MLED_ON);
ASUS_LED_HANDLER(pled, PLED_ON);
ASUS_LED_HANDLER(rled, RLED_ON);
ASUS_LED_HANDLER(tled, TLED_ON);
ASUS_LED_HANDLER(gled, GLED_ON);

static int get_lcd_state(void)
{
	return read_status(LCD_ON);
}

static int set_lcd_state(int value)
{
	int lcd = 0;
	acpi_status status = 0;

	lcd = value ? 1 : 0;

	if (lcd == get_lcd_state())
		return 0;

	if (lcd_switch_handle) {
		status = acpi_evaluate_object(lcd_switch_handle,
					      NULL, NULL, NULL);

		if (ACPI_FAILURE(status))
			printk(ASUS_WARNING "Error switching LCD\n");
	}

	write_status(NULL, lcd, LCD_ON);
	return 0;
}

static void lcd_blank(int blank)
{
	struct backlight_device *bd = asus_backlight_device;

	if (bd) {
		bd->props.power = blank;
		backlight_update_status(bd);
	}
}

static int read_brightness(struct backlight_device *bd)
{
	ulong value;
	acpi_status rv = AE_OK;

	rv = acpi_evaluate_integer(brightness_get_handle, NULL, NULL, &value);
	if (ACPI_FAILURE(rv))
		printk(ASUS_WARNING "Error reading brightness\n");

	return value;
}

static int set_brightness(struct backlight_device *bd, int value)
{
	int ret = 0;

	value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
	/* 0 <= value <= 15 */

	if (!write_acpi_int(brightness_set_handle, NULL, value, NULL)) {