Commit 8c4c731a authored by Lennart Poettering's avatar Lennart Poettering Committed by Len Brown
Browse files

MSI S270 Laptop support: backlight, wlan, bluetooth states 



Create a driver to support the platform-specific features
of MSI S270 laptops (and maybe other MSI laptops).
This driver implements a backlight device for controlling LCD brightness
(/sys/class/backlight/msi-laptop-bl/).
In addition it allows access to the WLAN and Bluetooth states
through a platform driver (/sys/devices/platform/msi-laptop-pf/).

Signed-off-by: default avatarLennart Poettering <mzxreary@0pointer.de>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ab9e43c6

MAINTAINERS

+7 −0
Original line number Diff line number Diff line
@@ -1998,6 +1998,13 @@ M: rubini@ipvvis.unipv.it 
L:	linux-kernel@vger.kernel.org

S:	Maintained



MSI LAPTOP SUPPORT

P:	Lennart Poettering

M:	mzxreary@0pointer.de

L:	https://tango.0pointer.de/mailman/listinfo/s270-linux

W:	http://0pointer.de/lennart/tchibo.html

S:	Maintained



MTRR AND SIMILAR SUPPORT [i386]

P:	Richard Gooch

M:	rgooch@atnf.csiro.au

drivers/misc/Kconfig

+19 −0
Original line number Diff line number Diff line
@@ -57,4 +57,23 @@ config TIFM_7XX1 
          To compile this driver as a module, choose M here: the module will

	  be called tifm_7xx1.



config MSI_LAPTOP

        tristate "MSI Laptop Extras"

        depends on X86

        depends on ACPI_EC

        depends on BACKLIGHT_CLASS_DEVICE

        ---help---

	  This is a driver for laptops built by MSI (MICRO-STAR

	  INTERNATIONAL):



	  MSI MegaBook S270 (MS-1013)

	  Cytron/TCM/Medion/Tchibo MD96100/SAM2000



	  It adds support for Bluetooth, WLAN and LCD brightness control.



	  More information about this driver is available at

	  <http://0pointer.de/lennart/tchibo.html>.



	  If you have an MSI S270 laptop, say Y or M here.



endmenu

drivers/misc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ obj- := misc.o # Dummy rule to force built-in.o to be made 


obj-$(CONFIG_IBM_ASM)		+= ibmasm/

obj-$(CONFIG_HDPU_FEATURES)	+= hdpuftrs/

obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o

obj-$(CONFIG_LKDTM)		+= lkdtm.o

obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o

obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o

drivers/misc/msi-laptop.c

0 → 100644
+395 −0
Original line number Diff line number Diff line 
/*-*-linux-c-*-*/



/*

  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.

 */



/*

 * msi-laptop.c - MSI S270 laptop support. This laptop is sold under

 * various brands, including "Cytron/TCM/Medion/Tchibo MD96100".

 *

 * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:

 *

 *   lcd_level - Screen brightness: contains a single integer in the

 *   range 0..8. (rw)

 *

 *   auto_brightness - Enable automatic brightness control: contains

 *   either 0 or 1. If set to 1 the hardware adjusts the screen

 *   brightness automatically when the power cord is

 *   plugged/unplugged. (rw)

 *

 *   wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)

 *

 *   bluetooth - Bluetooth subsystem enabled: contains either 0 or 1

 *   Please note that this file is constantly 0 if no Bluetooth

 *   hardware is available. (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/msi-laptop-bl/.

 *

 * This driver might work on other laptops produced by MSI. 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 MSI S270. 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 MSI_DRIVER_VERSION "0.5"



#define MSI_LCD_LEVEL_MAX 9



#define MSI_EC_COMMAND_WIRELESS 0x10

#define MSI_EC_COMMAND_LCD_LEVEL 0x11



static int force;

module_param(force, bool, 0);

MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");



static int auto_brightness;

module_param(auto_brightness, int, 0);

MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");



/* Hardware access */



static int set_lcd_level(int level)

{

	u8 buf[2];



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

		return -EINVAL;



	buf[0] = 0x80;

	buf[1] = (u8) (level*31);



	return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0);

}



static int get_lcd_level(void)

{

	u8 wdata = 0, rdata;

	int result;



	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);

	if (result < 0)

		return result;



	return (int) rdata / 31;

}



static int get_auto_brightness(void)

{

	u8 wdata = 4, rdata;

	int result;



	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);

	if (result < 0)

		return result;



	return !!(rdata & 8);

}



static int set_auto_brightness(int enable)

{

	u8 wdata[2], rdata;

	int result;



	wdata[0] = 4;



	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1);

	if (result < 0)

		return result;



	wdata[0] = 0x84;

	wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);



	return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0);

}



static int get_wireless_state(int *wlan, int *bluetooth)

{

	u8 wdata = 0, rdata;

	int result;



	result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1);

	if (result < 0)

		return -1;



	if (wlan)

		*wlan = !!(rdata & 8);



	if (bluetooth)

		*bluetooth = !!(rdata & 128);



	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_properties msibl_props = {

	.owner		= THIS_MODULE,

	.get_brightness = bl_get_brightness,

	.update_status  = bl_update_status,

	.max_brightness = MSI_LCD_LEVEL_MAX-1,

};



static struct backlight_device *msibl_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_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 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 >= MSI_LCD_LEVEL_MAX))

		return -EINVAL;



	ret = set_lcd_level(level);

	if (ret < 0)

		return ret;



	return count;

}



static ssize_t show_auto_brightness(struct device *dev,

	struct device_attribute *attr, char *buf)

{



	int ret;



	ret = get_auto_brightness();

	if (ret < 0)

		return ret;



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

}



static ssize_t store_auto_brightness(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{



	int enable, ret;



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

		return -EINVAL;



	ret = set_auto_brightness(enable);

	if (ret < 0)

		return ret;



	return count;

}



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

static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);

static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);

static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);



static struct attribute *msipf_attributes[] = {

	&dev_attr_lcd_level.attr,

	&dev_attr_auto_brightness.attr,

	&dev_attr_bluetooth.attr,

	&dev_attr_wlan.attr,

	NULL

};



static struct attribute_group msipf_attribute_group = {

	.attrs = msipf_attributes

};



static struct platform_driver msipf_driver = {

	.driver = {

		.name = "msi-laptop-pf",

		.owner = THIS_MODULE,

	}

};



static struct platform_device *msipf_device;



/* Initialization */



static struct dmi_system_id __initdata msi_dmi_table[] = {

	{

		.ident = "MSI S270",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),

			DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),

		}

	},

	{

		.ident = "Medion MD96100",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),

			DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),

		}

	},

	{ }

};





static int __init msi_init(void)

{

	int ret;



	if (acpi_disabled)

		return -ENODEV;



	if (!force && !dmi_check_system(msi_dmi_table))

		return -ENODEV;



	if (auto_brightness < 0 || auto_brightness > 2)

		return -EINVAL;



	/* Register backlight stuff */



	msibl_device = backlight_device_register("msi-laptop-bl", NULL, &msibl_props);

	if (IS_ERR(msibl_device))

		return PTR_ERR(msibl_device);



	ret = platform_driver_register(&msipf_driver);

	if (ret)

		goto fail_backlight;



	/* Register platform stuff */



	msipf_device = platform_device_alloc("msi-laptop-pf", -1);

	if (!msipf_device) {

		ret = -ENOMEM;

		goto fail_platform_driver;

	}



	ret = platform_device_add(msipf_device);

	if (ret)

		goto fail_platform_device1;



	ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);

	if (ret)

		goto fail_platform_device2;



	/* Disable automatic brightness control by default because

	 * this module was probably loaded to do brightness control in

	 * software. */



	if (auto_brightness != 2)

		set_auto_brightness(auto_brightness);



	printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");



	return 0;



fail_platform_device2:



	platform_device_del(msipf_device);



fail_platform_device1:



	platform_device_put(msipf_device);



fail_platform_driver:



	platform_driver_unregister(&msipf_driver);



fail_backlight:



	backlight_device_unregister(msibl_device);



	return ret;

}



static void __exit msi_cleanup(void)

{



	sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);

	platform_device_unregister(msipf_device);

	platform_driver_unregister(&msipf_driver);

	backlight_device_unregister(msibl_device);



	/* Enable automatic brightness control again */

	if (auto_brightness != 2)

		set_auto_brightness(1);



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

}



module_init(msi_init);

module_exit(msi_cleanup);



MODULE_AUTHOR("Lennart Poettering");

MODULE_DESCRIPTION("MSI Laptop Support");

MODULE_VERSION(MSI_DRIVER_VERSION);

MODULE_LICENSE("GPL");

CRA Git | Maintained and supported by SUSTech CRA and CCSE