fujitsu-laptop: create Fujitsu laptop platform specific driver

	  If you have an ACPI-compatible ASUS laptop, say Y or M here.

config FUJITSU_LAPTOP

        tristate "Fujitsu Laptop Extras"

        depends on X86

        depends on ACPI

        depends on BACKLIGHT_CLASS_DEVICE

        ---help---

	  This is a driver for laptops built by Fujitsu:

	    * P2xxx/P5xxx/S6xxx/S7xxx series Lifebooks

	    * Possibly other Fujitsu laptop models

	  It adds support for LCD brightness control.

	  If you have a Fujitsu laptop, say Y or M here.

config MSI_LAPTOP

        tristate "MSI Laptop Extras"

        depends on X86

obj-$(CONFIG_SGI_IOC4)		+= ioc4.o

obj-$(CONFIG_SONY_LAPTOP)	+= sony-laptop.o

obj-$(CONFIG_THINKPAD_ACPI)	+= thinkpad_acpi.o

obj-$(CONFIG_FUJITSU_LAPTOP)	+= fujitsu-laptop.o

obj-$(CONFIG_EEPROM_93CX6)	+= eeprom_93cx6.o

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

/*

  Copyright (C) 2007 Jonathan Woithe <jwoithe@physics.adelaide.edu.au>

  Based on earlier work:

    Copyright (C) 2003 Shane Spencer <shane@bogomip.com>

    Adrian Yee <brewt-fujitsu@brewt.org>

  Templated from msi-laptop.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/.

 *

 * This driver has been tested on a Fujitsu Lifebook S7020.  It should

 * work on most P-series and S-series Lifebooks, but YMMV.

 */

#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/platform_device.h>

#include <linux/autoconf.h>

#define FUJITSU_DRIVER_VERSION "0.3"

#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 extras driver"

#define ACPI_FUJITSU_DEVICE_NAME        "Fujitsu FUJ02B1"

struct fujitsu_t {

	acpi_handle acpi_handle;

	struct backlight_device *bl_device;

	struct platform_device *pf_device;

	unsigned long fuj02b1_state;

	unsigned int brightness_changed;

	unsigned int brightness_level;

};

static struct fujitsu_t *fujitsu;

/* Hardware access */

static int set_lcd_level(int level)

{

	acpi_status status = AE_OK;

	union acpi_object arg0 = { ACPI_TYPE_INTEGER };

	struct acpi_object_list arg_list = { 1, &arg0 };

	acpi_handle handle = NULL;

	if (level < 0 || level >= FUJITSU_LCD_N_LEVELS)

		return -EINVAL;

	if (!fujitsu)

		return -EINVAL;

	status = acpi_get_handle(fujitsu->acpi_handle, "SBLL", &handle);

	if (ACPI_FAILURE(status)) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SBLL not present\n"));

		return -ENODEV;

	}

	arg0.integer.value = level;

	status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);

	if (ACPI_FAILURE(status))

		return -ENODEV;

	return 0;

}

static int get_lcd_level(void)

{

	unsigned long state = 0;

	acpi_status status = AE_OK;

	// Get the Brightness

	status =

	    acpi_evaluate_integer(fujitsu->acpi_handle, "GBLL", NULL, &state);

	if (status < 0)

		return status;

	fujitsu->fuj02b1_state = state;

	fujitsu->brightness_level = state & 0x0fffffff;

	if (state & 0x80000000)

		fujitsu->brightness_changed = 1;

	else

		fujitsu->brightness_changed = 0;

	if (status < 0)

		return status;

	return fujitsu->brightness_level;

}

/* Backlight device stuff */

static int bl_get_brightness(struct backlight_device *b)

{

	return get_lcd_level();

}

static int bl_update_status(struct backlight_device *b)

{

	return set_lcd_level(b->props.brightness);

}

static struct backlight_ops fujitsubl_ops = {

	.get_brightness = bl_get_brightness,

	.update_status = bl_update_status,

};

/* Platform device */

static ssize_t show_lcd_level(struct device *dev,

			      struct device_attribute *attr, char *buf)

{

	int ret;

	ret = get_lcd_level();

	if (ret < 0)

		return ret;

	return sprintf(buf, "%i\n", ret);

}

static ssize_t store_lcd_level(struct device *dev,

			       struct device_attribute *attr, const char *buf,

			       size_t count)

{

	int level, ret;

	if (sscanf(buf, "%i", &level) != 1

	    || (level < 0 || level >= FUJITSU_LCD_N_LEVELS))

		return -EINVAL;

	ret = set_lcd_level(level);

	if (ret < 0)

		return ret;

	return count;

}

static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);

static struct attribute *fujitsupf_attributes[] = {

	&dev_attr_lcd_level.attr,

	NULL

};

static struct attribute_group fujitsupf_attribute_group = {

	.attrs = fujitsupf_attributes

};

static struct platform_driver fujitsupf_driver = {

	.driver = {

		   .name = "fujitsu-laptop",

		   .owner = THIS_MODULE,

		   }

};

/* ACPI device */

int acpi_fujitsu_add(struct acpi_device *device)

{

	int result = 0;

	int state = 0;

	ACPI_FUNCTION_TRACE("acpi_fujitsu_add");

	if (!device)

		return -EINVAL;

	fujitsu->acpi_handle = device->handle;

	sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME);

	sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);

	acpi_driver_data(device) = fujitsu;

	result = acpi_bus_get_power(fujitsu->acpi_handle, &state);

	if (result) {

		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,

				  "Error reading power state\n"));

		goto end;

	}

	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",

	       acpi_device_name(device), acpi_device_bid(device),

	       !device->power.state ? "on" : "off");

      end:

	return result;

}

int acpi_fujitsu_remove(struct acpi_device *device, int type)

{

	ACPI_FUNCTION_TRACE("acpi_fujitsu_remove");

	if (!device || !acpi_driver_data(device))

		return -EINVAL;

	fujitsu->acpi_handle = 0;

	return 0;

}

static const struct acpi_device_id fujitsu_device_ids[] = {

	{ACPI_FUJITSU_HID, 0},

	{"", 0},

};

static struct acpi_driver acpi_fujitsu_driver = {

	.name = ACPI_FUJITSU_DRIVER_NAME,

	.class = ACPI_FUJITSU_CLASS,

	.ids = fujitsu_device_ids,

	.ops = {

		.add = acpi_fujitsu_add,

		.remove = acpi_fujitsu_remove,

		},

};

/* Initialization */

static int __init fujitsu_init(void)

{

	int ret, result;

	if (acpi_disabled)

		return -ENODEV;

	fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL);

	if (!fujitsu)

		return -ENOMEM;

	memset(fujitsu, 0, sizeof(struct fujitsu_t));

	result = acpi_bus_register_driver(&acpi_fujitsu_driver);

	if (result < 0) {

		ret = -ENODEV;

		goto fail_acpi;

	}

	/* Register backlight stuff */

	fujitsu->bl_device =

	    backlight_device_register("fujitsu-laptop", NULL, NULL,

				      &fujitsubl_ops);

	if (IS_ERR(fujitsu->bl_device))

		return PTR_ERR(fujitsu->bl_device);

	fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1;

	ret = platform_driver_register(&fujitsupf_driver);

	if (ret)

		goto fail_backlight;

	/* Register platform stuff */

	fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1);

	if (!fujitsu->pf_device) {

		ret = -ENOMEM;

		goto fail_platform_driver;

	}

	ret = platform_device_add(fujitsu->pf_device);

	if (ret)

		goto fail_platform_device1;

	ret =

	    sysfs_create_group(&fujitsu->pf_device->dev.kobj,

			       &fujitsupf_attribute_group);

	if (ret)

		goto fail_platform_device2;

	printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION

	       " successfully loaded.\n");

	return 0;

      fail_platform_device2:

	platform_device_del(fujitsu->pf_device);

      fail_platform_device1:

	platform_device_put(fujitsu->pf_device);

      fail_platform_driver:

	platform_driver_unregister(&fujitsupf_driver);

      fail_backlight:

	backlight_device_unregister(fujitsu->bl_device);

      fail_acpi:

	kfree(fujitsu);

	return ret;

}

static void __exit fujitsu_cleanup(void)

{

	sysfs_remove_group(&fujitsu->pf_device->dev.kobj,

			   &fujitsupf_attribute_group);

	platform_device_unregister(fujitsu->pf_device);

	platform_driver_unregister(&fujitsupf_driver);

	backlight_device_unregister(fujitsu->bl_device);

	acpi_bus_unregister_driver(&acpi_fujitsu_driver);

	kfree(fujitsu);

	printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n");

}

module_init(fujitsu_init);

module_exit(fujitsu_cleanup);

MODULE_AUTHOR("Jonathan Woithe");

MODULE_DESCRIPTION("Fujitsu laptop extras support");

MODULE_VERSION(FUJITSU_DRIVER_VERSION);

MODULE_LICENSE("GPL");