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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: Lennart Poettering <mzxreary@0pointer.de> Cc: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lennart Poettering
Len Brown
parent
ab9e43c640
commit
8c4c731a89
@ -1998,6 +1998,13 @@ M: rubini@ipvvis.unipv.it
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L: linux-kernel@vger.kernel.org
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S: Maintained
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MSI LAPTOP SUPPORT
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P: Lennart Poettering
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M: mzxreary@0pointer.de
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L: https://tango.0pointer.de/mailman/listinfo/s270-linux
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W: http://0pointer.de/lennart/tchibo.html
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S: Maintained
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MTRR AND SIMILAR SUPPORT [i386]
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P: Richard Gooch
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M: rgooch@atnf.csiro.au
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@ -57,4 +57,23 @@ config TIFM_7XX1
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To compile this driver as a module, choose M here: the module will
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be called tifm_7xx1.
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config MSI_LAPTOP
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tristate "MSI Laptop Extras"
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depends on X86
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depends on ACPI_EC
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depends on BACKLIGHT_CLASS_DEVICE
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---help---
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This is a driver for laptops built by MSI (MICRO-STAR
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INTERNATIONAL):
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MSI MegaBook S270 (MS-1013)
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Cytron/TCM/Medion/Tchibo MD96100/SAM2000
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It adds support for Bluetooth, WLAN and LCD brightness control.
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More information about this driver is available at
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<http://0pointer.de/lennart/tchibo.html>.
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If you have an MSI S270 laptop, say Y or M here.
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endmenu
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@ -5,6 +5,7 @@ obj- := misc.o # Dummy rule to force built-in.o to be made
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obj-$(CONFIG_IBM_ASM) += ibmasm/
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obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/
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obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o
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obj-$(CONFIG_LKDTM) += lkdtm.o
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obj-$(CONFIG_TIFM_CORE) += tifm_core.o
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obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
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395
drivers/misc/msi-laptop.c
Normal file
395
drivers/misc/msi-laptop.c
Normal file
@ -0,0 +1,395 @@
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/*-*-linux-c-*-*/
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/*
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Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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/*
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* msi-laptop.c - MSI S270 laptop support. This laptop is sold under
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* various brands, including "Cytron/TCM/Medion/Tchibo MD96100".
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*
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* This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:
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*
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* lcd_level - Screen brightness: contains a single integer in the
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* range 0..8. (rw)
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*
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* auto_brightness - Enable automatic brightness control: contains
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* either 0 or 1. If set to 1 the hardware adjusts the screen
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* brightness automatically when the power cord is
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* plugged/unplugged. (rw)
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*
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* wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)
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*
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* bluetooth - Bluetooth subsystem enabled: contains either 0 or 1
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* Please note that this file is constantly 0 if no Bluetooth
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* hardware is available. (ro)
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*
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* In addition to these platform device attributes the driver
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* registers itself in the Linux backlight control subsystem and is
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* available to userspace under /sys/class/backlight/msi-laptop-bl/.
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*
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* This driver might work on other laptops produced by MSI. If you
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* want to try it you can pass force=1 as argument to the module which
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* will force it to load even when the DMI data doesn't identify the
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* laptop as MSI S270. YMMV.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/backlight.h>
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#include <linux/platform_device.h>
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#include <linux/autoconf.h>
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#define MSI_DRIVER_VERSION "0.5"
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#define MSI_LCD_LEVEL_MAX 9
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#define MSI_EC_COMMAND_WIRELESS 0x10
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#define MSI_EC_COMMAND_LCD_LEVEL 0x11
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static int force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
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static int auto_brightness;
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module_param(auto_brightness, int, 0);
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MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");
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/* Hardware access */
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static int set_lcd_level(int level)
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{
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u8 buf[2];
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if (level < 0 || level >= MSI_LCD_LEVEL_MAX)
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return -EINVAL;
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buf[0] = 0x80;
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buf[1] = (u8) (level*31);
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return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0);
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}
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static int get_lcd_level(void)
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{
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u8 wdata = 0, rdata;
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int result;
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result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
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if (result < 0)
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return result;
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return (int) rdata / 31;
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}
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static int get_auto_brightness(void)
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{
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u8 wdata = 4, rdata;
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int result;
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result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
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if (result < 0)
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return result;
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return !!(rdata & 8);
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}
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static int set_auto_brightness(int enable)
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{
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u8 wdata[2], rdata;
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int result;
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wdata[0] = 4;
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result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1);
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if (result < 0)
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return result;
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wdata[0] = 0x84;
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wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);
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return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0);
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}
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static int get_wireless_state(int *wlan, int *bluetooth)
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{
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u8 wdata = 0, rdata;
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int result;
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result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1);
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if (result < 0)
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return -1;
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if (wlan)
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*wlan = !!(rdata & 8);
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if (bluetooth)
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*bluetooth = !!(rdata & 128);
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return 0;
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}
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/* Backlight device stuff */
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static int bl_get_brightness(struct backlight_device *b)
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{
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return get_lcd_level();
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}
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static int bl_update_status(struct backlight_device *b)
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{
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return set_lcd_level(b->props->brightness);
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}
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static struct backlight_properties msibl_props = {
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.owner = THIS_MODULE,
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.get_brightness = bl_get_brightness,
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.update_status = bl_update_status,
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.max_brightness = MSI_LCD_LEVEL_MAX-1,
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};
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static struct backlight_device *msibl_device;
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/* Platform device */
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static ssize_t show_wlan(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret, enabled;
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ret = get_wireless_state(&enabled, NULL);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%i\n", enabled);
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}
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static ssize_t show_bluetooth(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret, enabled;
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ret = get_wireless_state(NULL, &enabled);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%i\n", enabled);
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}
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static ssize_t show_lcd_level(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = get_lcd_level();
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if (ret < 0)
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return ret;
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return sprintf(buf, "%i\n", ret);
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}
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static ssize_t store_lcd_level(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int level, ret;
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if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX))
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return -EINVAL;
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ret = set_lcd_level(level);
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if (ret < 0)
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return ret;
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return count;
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}
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static ssize_t show_auto_brightness(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = get_auto_brightness();
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if (ret < 0)
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return ret;
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return sprintf(buf, "%i\n", ret);
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}
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static ssize_t store_auto_brightness(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int enable, ret;
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if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1)))
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return -EINVAL;
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ret = set_auto_brightness(enable);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
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static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);
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static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);
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static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);
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static struct attribute *msipf_attributes[] = {
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&dev_attr_lcd_level.attr,
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&dev_attr_auto_brightness.attr,
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&dev_attr_bluetooth.attr,
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&dev_attr_wlan.attr,
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NULL
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};
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static struct attribute_group msipf_attribute_group = {
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.attrs = msipf_attributes
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};
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static struct platform_driver msipf_driver = {
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.driver = {
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.name = "msi-laptop-pf",
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.owner = THIS_MODULE,
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}
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};
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static struct platform_device *msipf_device;
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/* Initialization */
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static struct dmi_system_id __initdata msi_dmi_table[] = {
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{
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.ident = "MSI S270",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),
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DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),
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}
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},
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{
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.ident = "Medion MD96100",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),
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}
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},
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{ }
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};
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static int __init msi_init(void)
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{
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int ret;
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if (acpi_disabled)
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return -ENODEV;
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if (!force && !dmi_check_system(msi_dmi_table))
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return -ENODEV;
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if (auto_brightness < 0 || auto_brightness > 2)
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return -EINVAL;
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/* Register backlight stuff */
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msibl_device = backlight_device_register("msi-laptop-bl", NULL, &msibl_props);
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if (IS_ERR(msibl_device))
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return PTR_ERR(msibl_device);
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ret = platform_driver_register(&msipf_driver);
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if (ret)
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goto fail_backlight;
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/* Register platform stuff */
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msipf_device = platform_device_alloc("msi-laptop-pf", -1);
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if (!msipf_device) {
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ret = -ENOMEM;
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goto fail_platform_driver;
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}
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ret = platform_device_add(msipf_device);
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if (ret)
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goto fail_platform_device1;
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ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);
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if (ret)
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goto fail_platform_device2;
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/* Disable automatic brightness control by default because
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* this module was probably loaded to do brightness control in
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* software. */
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if (auto_brightness != 2)
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set_auto_brightness(auto_brightness);
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printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");
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return 0;
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fail_platform_device2:
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platform_device_del(msipf_device);
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fail_platform_device1:
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platform_device_put(msipf_device);
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fail_platform_driver:
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platform_driver_unregister(&msipf_driver);
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fail_backlight:
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backlight_device_unregister(msibl_device);
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return ret;
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}
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static void __exit msi_cleanup(void)
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{
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sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);
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platform_device_unregister(msipf_device);
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platform_driver_unregister(&msipf_driver);
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backlight_device_unregister(msibl_device);
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/* Enable automatic brightness control again */
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if (auto_brightness != 2)
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set_auto_brightness(1);
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printk(KERN_INFO "msi-laptop: driver unloaded.\n");
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}
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module_init(msi_init);
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module_exit(msi_cleanup);
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MODULE_AUTHOR("Lennart Poettering");
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MODULE_DESCRIPTION("MSI Laptop Support");
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MODULE_VERSION(MSI_DRIVER_VERSION);
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MODULE_LICENSE("GPL");
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