/*-*-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, 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");
