From: Lennart Poettering <mzxreary@xxxxxxxxxxx> A driver for the special 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@xxxxxxxxxxx> --- This is the fourth version of this driver. Changes to the previous version are mostly cosmetics: indentation, removal von Subversion $Id$ and minor changes in the commenting style. These changes were requested by Pavel Machek and Andrew Morton. (Just for reference, the previous version of this patch is available here: http://lkml.org/lkml/2006/8/20/219) Applies to Len Brown's current linux-acpi tree. Len, please merge! Thanks, Lennart MAINTAINERS | 7 + drivers/acpi/ec.c | 2 drivers/misc/Kconfig | 19 ++ drivers/misc/Makefile | 1 drivers/misc/msi-laptop.c | 383 +++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 412 insertions(+), 0 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index 23348c0..0d99de9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1978,6 +1978,13 @@ M: rubini@xxxxxxxxxxxxxxx L: linux-kernel@xxxxxxxxxxxxxxx S: Maintained +MSI LAPTOP SUPPORT +P: Lennart Poettering +M: mzxreary@xxxxxxxxxxx +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@xxxxxxxxxxxxx diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index ae05e8c..e6d4b08 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -384,6 +384,8 @@ extern int ec_transaction(u8 command, wdata_len, rdata, rdata_len); } +EXPORT_SYMBOL(ec_transaction); + static int acpi_ec_query(struct acpi_ec *ec, u8 *data) { int result; diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 7fc692a..d25b0db 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -28,5 +28,24 @@ config IBM_ASM If unsure, say N. +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 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 19c2b85..1328c5f 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -5,3 +5,4 @@ obj- := misc.o # Dummy rule to force bui obj-$(CONFIG_IBM_ASM) += ibmasm/ obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/ +obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c new file mode 100644 index 0000000..6b87b42 --- /dev/null +++ b/drivers/misc/msi-laptop.c @@ -0,0 +1,383 @@ +/*-*-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 "0.4" + +#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_register_simple("msi-laptop-pf", -1, NULL, 0); + if (IS_ERR(msipf_device)) { + ret = PTR_ERR(msipf_device); + goto fail_platform_driver; + } + + ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group); + if (ret) + goto fail_platform_device; + + /* 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_device: + + platform_device_unregister(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"); -- 1.4.1.1 - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
