path: root/drivers/platform/x86/fujitsu-laptop.c

/*-*-linux-c-*-*/

/*
  Copyright (C) 2007,2008 Jonathan Woithe <jwoithe@physics.adelaide.edu.au>
  Copyright (C) 2008 Peter Gruber <nokos@gmx.net>
  Copyright (C) 2008 Tony Vroon <tony@linx.net>
  Based on earlier work:
    Copyright (C) 2003 Shane Spencer <shane@bogomip.com>
    Adrian Yee <brewt-fujitsu@brewt.org>

  Templated from msi-laptop.c and thinkpad_acpi.c which is copyright
  by its respective authors.

  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., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.
 */

/*
 * fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
 * features made available on a range of Fujitsu laptops including the
 * P2xxx/P5xxx/S6xxx/S7xxx series.
 *
 * This driver exports a few files in /sys/devices/platform/fujitsu-laptop/;
 * others may be added at a later date.
 *
 *   lcd_level - Screen brightness: contains a single integer in the
 *   range 0..7. (rw)
 *
 * In addition to these platform device attributes the driver
 * registers itself in the Linux backlight control subsystem and is
 * available to userspace under /sys/class/backlight/fujitsu-laptop/.
 *
 * Hotkeys present on certain Fujitsu laptops (eg: the S6xxx series) are
 * also supported by this driver.
 *
 * This driver has been tested on a Fujitsu Lifebook S6410, S7020 and
 * P8010.  It should work on most P-series and S-series Lifebooks, but
 * YMMV.
 *
 * The module parameter use_alt_lcd_levels switches between different ACPI
 * brightness controls which are used by different Fujitsu laptops.  In most
 * cases the correct method is automatically detected. "use_alt_lcd_levels=1"
 * is applicable for a Fujitsu Lifebook S6410 if autodetection fails.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/backlight.h>
#include <linux/input.h>
#include <linux/kfifo.h>
#include <linux/video_output.h>
#include <linux/platform_device.h>
#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
#include <linux/leds.h>
#endif

#define FUJITSU_DRIVER_VERSION "0.6.0"

#define FUJITSU_LCD_N_LEVELS 8

#define ACPI_FUJITSU_CLASS              "fujitsu"
#define ACPI_FUJITSU_HID                "FUJ02B1"
#define ACPI_FUJITSU_DRIVER_NAME	"Fujitsu laptop FUJ02B1 ACPI brightness driver"
#define ACPI_FUJITSU_DEVICE_NAME        "Fujitsu FUJ02B1"
#define ACPI_FUJITSU_HOTKEY_HID 	"FUJ02E3"
#define ACPI_FUJITSU_HOTKEY_DRIVER_NAME "Fujitsu laptop FUJ02E3 ACPI hotkeys driver"
#define ACPI_FUJITSU_HOTKEY_DEVICE_NAME "Fujitsu FUJ02E3"

#define ACPI_FUJITSU_NOTIFY_CODE1     0x80

#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS     0x86
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS     0x87

/* FUNC interface - command values */
#define FUNC_RFKILL	0x1000
#define FUNC_LEDS	0x1001
#define FUNC_BUTTONS	0x1002
#define FUNC_BACKLIGHT  0x1004

/* FUNC interface - responses */
#define UNSUPPORTED_CMD 0x80000000

#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
/* FUNC interface - LED control */
#define FUNC_LED_OFF	0x1
#define FUNC_LED_ON	0x30001
#define KEYBOARD_LAMPS	0x100
#define LOGOLAMP_POWERON 0x2000
#define LOGOLAMP_ALWAYS  0x4000
#endif

/* Hotkey details */
#define KEY1_CODE	0x410	/* codes for the keys in the GIRB register */
#define KEY2_CODE	0x411
#define KEY3_CODE	0x412
#define KEY4_CODE	0x413

#define MAX_HOTKEY_RINGBUFFER_SIZE 100
#define RINGBUFFERSIZE 40

/* Debugging */
#define FUJLAPTOP_LOG	   ACPI_FUJITSU_HID ": "
#define FUJLAPTOP_ERR	   KERN_ERR FUJLAPTOP_LOG
#define FUJLAPTOP_NOTICE   KERN_NOTICE FUJLAPTOP_LOG
#define FUJLAPTOP_INFO	   KERN_INFO FUJLAPTOP_LOG
#define FUJLAPTOP_DEBUG    KERN_DEBUG FUJLAPTOP_LOG

#define FUJLAPTOP_DBG_ALL	  0xffff
#define FUJLAPTOP_DBG_ERROR	  0x0001
#define FUJLAPTOP_DBG_WARN	  0x0002
#define FUJLAPTOP_DBG_INFO	  0x0004
#define FUJLAPTOP_DBG_TRACE	  0x0008

#define dbg_printk(a_dbg_level, format, arg...) \
	do { if (dbg_level & a_dbg_level) \
		printk(FUJLAPTOP_DEBUG "%s: " format, __func__ , ## arg); \
	} while (0)
#ifdef CONFIG_FUJITSU_LAPTOP_DEBUG
#define vdbg_printk(a_dbg_level, format, arg...) \
	dbg_printk(a_dbg_level, format, ## arg)
#else
#define vdbg_printk(a_dbg_level, format, arg...)
#endif

/* Device controlling the backlight and associated keys */
struct fujitsu_t {
	acpi_handle acpi_handle;
	struct acpi_device *dev;
	struct input_dev *input;
	char phys[32];
	struct backlight_device *bl_device;
	struct platform_device *pf_device;
	int keycode1, keycode2, keycode3, keycode4;

	unsigned int max_brightness;
	unsigned int brightness_changed;
	unsigned int brightness_level;
};

static struct fujitsu_t *fujitsu;
static int use_alt_lcd_levels = -1;
static int disable_brightness_adjust = -1;

/* Device used to access other hotkeys on the laptop */
struct fujitsu_hotkey_t {
	acpi_handle acpi_handle;
	struct acpi_device *dev;
	struct input_dev *input;
	char phys[32];
	struct platform_device *pf_device;
	struct kfifo fifo;
	spinlock_t fifo_lock;
	int rfkill_supported;
	int rfkill_state;
	int logolamp_registered;
	int kblamps_registered;
};

static struct fujitsu_h