drivers/platform/x86/compal-laptop.c - kernel/windcharger - Git at Google

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

 /*
   Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>

   based on MSI driver

   Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>

   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.
  */

 /*
  * comapl-laptop.c - Compal laptop support.
  *
  * This driver exports a few files in /sys/devices/platform/compal-laptop/:
  *
  *   wlan - wlan subsystem state: contains 0 or 1 (rw)
  *
  *   bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
  *
  *   raw - raw value taken from embedded controller register (ro)
  *
  * 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/compal-laptop/.
  *
  * This driver might work on other laptops produced by Compal. If you
  * want to try it you can pass force=1 as argument to the module which
  * will force it to load even when the DMI data doesn't identify the
  * laptop as FL9x.
  */

 #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 COMPAL_DRIVER_VERSION "0.2.6"

 #define COMPAL_LCD_LEVEL_MAX 8

 #define COMPAL_EC_COMMAND_WIRELESS 0xBB
 #define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9

 #define KILLSWITCH_MASK 0x10
 #define WLAN_MASK	0x01
 #define BT_MASK 	0x02

 static int force;
 module_param(force, bool, 0);
 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

 /* Hardware access */

 static int set_lcd_level(int level)
 {
 	if (level < 0 || level >= COMPAL_LCD_LEVEL_MAX)
 		return -EINVAL;

 	ec_write(COMPAL_EC_COMMAND_LCD_LEVEL, level);

 	return 0;
 }

 static int get_lcd_level(void)
 {
 	u8 result;

 	ec_read(COMPAL_EC_COMMAND_LCD_LEVEL, &result);

 	return (int) result;
 }

 static int set_wlan_state(int state)
 {
 	u8 result, value;

 	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

 	if ((result & KILLSWITCH_MASK) == 0)
 		return -EINVAL;
 	else {
 		if (state)
 			value = (u8) (result | WLAN_MASK);
 		else
 			value = (u8) (result & ~WLAN_MASK);
 		ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
 	}

 	return 0;
 }

 static int set_bluetooth_state(int state)
 {
 	u8 result, value;

 	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

 	if ((result & KILLSWITCH_MASK) == 0)
 		return -EINVAL;
 	else {
 		if (state)
 			value = (u8) (result | BT_MASK);
 		else
 			value = (u8) (result & ~BT_MASK);
 		ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
 	}

 	return 0;
 }

 static int get_wireless_state(int *wlan, int *bluetooth)
 {
 	u8 result;

 	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

 	if (wlan) {
 		if ((result & KILLSWITCH_MASK) == 0)
 			*wlan = 0;
 		else
 			*wlan = result & WLAN_MASK;
 	}

 	if (bluetooth) {
 		if ((result & KILLSWITCH_MASK) == 0)
 			*bluetooth = 0;
 		else
 			*bluetooth = (result & BT_MASK) >> 1;
 	}

 	return 0;
 }

 /* 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 compalbl_ops = {
 	.get_brightness = bl_get_brightness,
 	.update_status	= bl_update_status,
 };

 static struct backlight_device *compalbl_device;

 /* Platform device */

 static ssize_t show_wlan(struct device *dev,
 	struct device_attribute *attr, char *buf)
 {
 	int ret, enabled;

 	ret = get_wireless_state(&enabled, NULL);
 	if (ret < 0)
 		return ret;

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

 static ssize_t show_raw(struct device *dev,
 	struct device_attribute *attr, char *buf)
 {
 	u8 result;

 	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

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

 static ssize_t show_bluetooth(struct device *dev,
 	struct device_attribute *attr, char *buf)
 {
 	int ret, enabled;

 	ret = get_wireless_state(NULL, &enabled);
 	if (ret < 0)
 		return ret;

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

 static ssize_t store_wlan_state(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
 	int state, ret;

 	if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
 		return -EINVAL;

 	ret = set_wlan_state(state);
 	if (ret < 0)
 		return ret;

 	return count;
 }

 static ssize_t store_bluetooth_state(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
 	int state, ret;

 	if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
 		return -EINVAL;

 	ret = set_bluetooth_state(state);
 	if (ret < 0)
 		return ret;

 	return count;
 }

 static DEVICE_ATTR(bluetooth, 0644, show_bluetooth, store_bluetooth_state);
 static DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan_state);
 static DEVICE_ATTR(raw, 0444, show_raw, NULL);

 static struct attribute *compal_attributes[] = {
 	&dev_attr_bluetooth.attr,
 	&dev_attr_wlan.attr,
 	&dev_attr_raw.attr,
 	NULL
 };

 static struct attribute_group compal_attribute_group = {
 	.attrs = compal_attributes
 };

 static struct platform_driver compal_driver = {
 	.driver = {
 		.name = "compal-laptop",
 		.owner = THIS_MODULE,
 	}
 };

 static struct platform_device *compal_device;

 /* Initialization */

 static int dmi_check_cb(const struct dmi_system_id *id)
 {
 	printk(KERN_INFO "compal-laptop: Identified laptop model '%s'.\n",
 		id->ident);

 	return 0;
 }

 static struct dmi_system_id __initdata compal_dmi_table[] = {
 	{
 		.ident = "FL90/IFL90",
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
 			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 		},
 		.callback = dmi_check_cb
 	},
 	{
 		.ident = "FL90/IFL90",
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
 			DMI_MATCH(DMI_BOARD_VERSION, "REFERENCE"),
 		},
 		.callback = dmi_check_cb
 	},
 	{
 		.ident = "FL91/IFL91",
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "IFL91"),
 			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 		},
 		.callback = dmi_check_cb
 	},
 	{
 		.ident = "FL92/JFL92",
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "JFL92"),
 			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 		},
 		.callback = dmi_check_cb
 	},
 	{
 		.ident = "FT00/IFT00",
 		.matches = {
 			DMI_MATCH(DMI_BOARD_NAME, "IFT00"),
 			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 		},
 		.callback = dmi_check_cb
 	},
 	{ }
 };

 static int __init compal_init(void)
 {
 	int ret;

 	if (acpi_disabled)
 		return -ENODEV;

 	if (!force && !dmi_check_system(compal_dmi_table))
 		return -ENODEV;

 	/* Register backlight stuff */

 	if (!acpi_video_backlight_support()) {
 		compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
 							    &compalbl_ops);
 		if (IS_ERR(compalbl_device))
 			return PTR_ERR(compalbl_device);

 		compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
 	}

 	ret = platform_driver_register(&compal_driver);
 	if (ret)
 		goto fail_backlight;

 	/* Register platform stuff */

 	compal_device = platform_device_alloc("compal-laptop", -1);
 	if (!compal_device) {
 		ret = -ENOMEM;
 		goto fail_platform_driver;
 	}

 	ret = platform_device_add(compal_device);
 	if (ret)
 		goto fail_platform_device1;

 	ret = sysfs_create_group(&compal_device->dev.kobj,
 		&compal_attribute_group);
 	if (ret)
 		goto fail_platform_device2;

 	printk(KERN_INFO "compal-laptop: driver "COMPAL_DRIVER_VERSION
 		" successfully loaded.\n");

 	return 0;

 fail_platform_device2:

 	platform_device_del(compal_device);

 fail_platform_device1:

 	platform_device_put(compal_device);

 fail_platform_driver:

 	platform_driver_unregister(&compal_driver);

 fail_backlight:

 	backlight_device_unregister(compalbl_device);

 	return ret;
 }

 static void __exit compal_cleanup(void)
 {

 	sysfs_remove_group(&compal_device->dev.kobj, &compal_attribute_group);
 	platform_device_unregister(compal_device);
 	platform_driver_unregister(&compal_driver);
 	backlight_device_unregister(compalbl_device);

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

 module_init(compal_init);
 module_exit(compal_cleanup);

 MODULE_AUTHOR("Cezary Jackiewicz");
 MODULE_DESCRIPTION("Compal Laptop Support");
 MODULE_VERSION(COMPAL_DRIVER_VERSION);
 MODULE_LICENSE("GPL");

 MODULE_ALIAS("dmi:*:rnIFL90:rvrIFT00:*");
 MODULE_ALIAS("dmi:*:rnIFL90:rvrREFERENCE:*");
 MODULE_ALIAS("dmi:*:rnIFL91:rvrIFT00:*");
 MODULE_ALIAS("dmi:*:rnJFL92:rvrIFT00:*");
 MODULE_ALIAS("dmi:*:rnIFT00:rvrIFT00:*");
	/--linux-c--/

	/*
	Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>

	based on MSI driver

	Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>

	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.
	*/

	/*
	* comapl-laptop.c - Compal laptop support.
	*
	* This driver exports a few files in /sys/devices/platform/compal-laptop/:
	*
	* wlan - wlan subsystem state: contains 0 or 1 (rw)
	*
	* bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
	*
	* raw - raw value taken from embedded controller register (ro)
	*
	* 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/compal-laptop/.
	*
	* This driver might work on other laptops produced by Compal. If you
	* want to try it you can pass force=1 as argument to the module which
	* will force it to load even when the DMI data doesn't identify the
	* laptop as FL9x.
	*/

	#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 COMPAL_DRIVER_VERSION "0.2.6"

	#define COMPAL_LCD_LEVEL_MAX 8

	#define COMPAL_EC_COMMAND_WIRELESS 0xBB
	#define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9

	#define KILLSWITCH_MASK 0x10
	#define WLAN_MASK 0x01
	#define BT_MASK 0x02

	static int force;
	module_param(force, bool, 0);
	MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

	/* Hardware access */

	static int set_lcd_level(int level)
	{
	if (level < 0 \|\| level >= COMPAL_LCD_LEVEL_MAX)
	return -EINVAL;

	ec_write(COMPAL_EC_COMMAND_LCD_LEVEL, level);

	return 0;
	}

	static int get_lcd_level(void)
	{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_LCD_LEVEL, &result);

	return (int) result;
	}

	static int set_wlan_state(int state)
	{
	u8 result, value;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if ((result & KILLSWITCH_MASK) == 0)
	return -EINVAL;
	else {
	if (state)
	value = (u8) (result \| WLAN_MASK);
	else
	value = (u8) (result & ~WLAN_MASK);
	ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
	}

	return 0;
	}

	static int set_bluetooth_state(int state)
	{
	u8 result, value;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if ((result & KILLSWITCH_MASK) == 0)
	return -EINVAL;
	else {
	if (state)
	value = (u8) (result \| BT_MASK);
	else
	value = (u8) (result & ~BT_MASK);
	ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
	}

	return 0;
	}

	static int get_wireless_state(int wlan, int bluetooth)
	{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if (wlan) {
	if ((result & KILLSWITCH_MASK) == 0)
	*wlan = 0;
	else
	*wlan = result & WLAN_MASK;
	}

	if (bluetooth) {
	if ((result & KILLSWITCH_MASK) == 0)
	*bluetooth = 0;
	else
	*bluetooth = (result & BT_MASK) >> 1;
	}

	return 0;
	}

	/* 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 compalbl_ops = {
	.get_brightness = bl_get_brightness,
	.update_status = bl_update_status,
	};

	static struct backlight_device *compalbl_device;

	/* Platform device */

	static ssize_t show_wlan(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int ret, enabled;

	ret = get_wireless_state(&enabled, NULL);
	if (ret < 0)
	return ret;

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

	static ssize_t show_raw(struct device *dev,
	struct device_attribute attr, char buf)
	{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

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

	static ssize_t show_bluetooth(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int ret, enabled;

	ret = get_wireless_state(NULL, &enabled);
	if (ret < 0)
	return ret;

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

	static ssize_t store_wlan_state(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	int state, ret;

	if (sscanf(buf, "%i", &state) != 1 \|\| (state < 0 \|\| state > 1))
	return -EINVAL;

	ret = set_wlan_state(state);
	if (ret < 0)
	return ret;

	return count;
	}

	static ssize_t store_bluetooth_state(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	int state, ret;

	if (sscanf(buf, "%i", &state) != 1 \|\| (state < 0 \|\| state > 1))
	return -EINVAL;

	ret = set_bluetooth_state(state);
	if (ret < 0)
	return ret;

	return count;
	}

	static DEVICE_ATTR(bluetooth, 0644, show_bluetooth, store_bluetooth_state);
	static DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan_state);
	static DEVICE_ATTR(raw, 0444, show_raw, NULL);

	static struct attribute *compal_attributes[] = {
	&dev_attr_bluetooth.attr,
	&dev_attr_wlan.attr,
	&dev_attr_raw.attr,
	NULL
	};

	static struct attribute_group compal_attribute_group = {
	.attrs = compal_attributes
	};

	static struct platform_driver compal_driver = {
	.driver = {
	.name = "compal-laptop",
	.owner = THIS_MODULE,
	}
	};

	static struct platform_device *compal_device;

	/* Initialization */

	static int dmi_check_cb(const struct dmi_system_id *id)
	{
	printk(KERN_INFO "compal-laptop: Identified laptop model '%s'.\n",
	id->ident);

	return 0;
	}

	static struct dmi_system_id __initdata compal_dmi_table[] = {
	{
	.ident = "FL90/IFL90",
	.matches = {
	DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
	DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
	},
	.callback = dmi_check_cb
	},
	{
	.ident = "FL90/IFL90",
	.matches = {
	DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
	DMI_MATCH(DMI_BOARD_VERSION, "REFERENCE"),
	},
	.callback = dmi_check_cb
	},
	{
	.ident = "FL91/IFL91",
	.matches = {
	DMI_MATCH(DMI_BOARD_NAME, "IFL91"),
	DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
	},
	.callback = dmi_check_cb
	},
	{
	.ident = "FL92/JFL92",
	.matches = {
	DMI_MATCH(DMI_BOARD_NAME, "JFL92"),
	DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
	},
	.callback = dmi_check_cb
	},
	{
	.ident = "FT00/IFT00",
	.matches = {
	DMI_MATCH(DMI_BOARD_NAME, "IFT00"),
	DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
	},
	.callback = dmi_check_cb
	},
	{ }
	};

	static int __init compal_init(void)
	{
	int ret;

	if (acpi_disabled)
	return -ENODEV;

	if (!force && !dmi_check_system(compal_dmi_table))
	return -ENODEV;

	/* Register backlight stuff */

	if (!acpi_video_backlight_support()) {
	compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
	&compalbl_ops);
	if (IS_ERR(compalbl_device))
	return PTR_ERR(compalbl_device);

	compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
	}

	ret = platform_driver_register(&compal_driver);
	if (ret)
	goto fail_backlight;

	/* Register platform stuff */

	compal_device = platform_device_alloc("compal-laptop", -1);
	if (!compal_device) {
	ret = -ENOMEM;
	goto fail_platform_driver;
	}

	ret = platform_device_add(compal_device);
	if (ret)
	goto fail_platform_device1;

	ret = sysfs_create_group(&compal_device->dev.kobj,
	&compal_attribute_group);
	if (ret)
	goto fail_platform_device2;

	printk(KERN_INFO "compal-laptop: driver "COMPAL_DRIVER_VERSION
	" successfully loaded.\n");

	return 0;

	fail_platform_device2:

	platform_device_del(compal_device);

	fail_platform_device1:

	platform_device_put(compal_device);

	fail_platform_driver:

	platform_driver_unregister(&compal_driver);

	fail_backlight:

	backlight_device_unregister(compalbl_device);

	return ret;
	}

	static void __exit compal_cleanup(void)
	{

	sysfs_remove_group(&compal_device->dev.kobj, &compal_attribute_group);
	platform_device_unregister(compal_device);
	platform_driver_unregister(&compal_driver);
	backlight_device_unregister(compalbl_device);

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

	module_init(compal_init);
	module_exit(compal_cleanup);

	MODULE_AUTHOR("Cezary Jackiewicz");
	MODULE_DESCRIPTION("Compal Laptop Support");
	MODULE_VERSION(COMPAL_DRIVER_VERSION);
	MODULE_LICENSE("GPL");

	MODULE_ALIAS("dmi::rnIFL90:rvrIFT00:");
	MODULE_ALIAS("dmi::rnIFL90:rvrREFERENCE:");
	MODULE_ALIAS("dmi::rnIFL91:rvrIFT00:");
	MODULE_ALIAS("dmi::rnJFL92:rvrIFT00:");
	MODULE_ALIAS("dmi::rnIFT00:rvrIFT00:");