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Message-ID: <20060820225209.GA5453@curacao>
Date: Mon, 21 Aug 2006 00:52:09 +0200
From: Lennart Poettering <mzxreary@...inter.de>
To: len.brown@...el.com, rubini@...vis.unipv.it, pavel@...e.cz
Cc: linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: [PATCH] misc,acpi,backlight: MSI S270 Laptop support, third try
From: Lennart Poettering <mzxreary@...inter.de>
This is the third version of my MSI S270 Laptop driver. Most things I
wrote about the first two versions are still true:
http://marc.theaimsgroup.com/?l=linux-acpi&m=115517193510912&w=2
http://marc.theaimsgroup.com/?l=linux-kernel&m=115522739203174&w=2
Changes from the second version are:
- Added a new DMI entry for a supported laptop model
- Renamed to "msi-laptop.c" (originally s270.c). This driver probably
works on more MSI laptops than just the S270. (On request of Thomas
Renninger)
- Don't use a static brightness level translation table, instead just
multiply/divide by 31 to convert from harware to software brightness
levels (On request of Pavel Machek)
- Split up "if" lines (on request of Pavel Machek)
- Fix the maximum brightness level passed to the backlight control
subsystem.
Applies to Linus' current GIT tree. (2.6.18pre)
Requires the ec_transaction patch I posted earlier.
Please merge!
I wonder who's the right one to ask for merging, since this driver
sits in drivers/misc/. According to MAINTAINERS Alessandro Rubini
maintains that directory. However it's somewhat based on the ACPI EC
access stuff I posted earlier, hence the APCI tree might be another
path to get this merged. Len, Alessandro, which one of you shall I
bug to get this driver commited?
Thanks,
Lennart
Signed-off-by: Lennart Poettering <mzxreary@...inter.de>
---
MAINTAINERS | 7 +
drivers/misc/Kconfig | 19 ++
drivers/misc/Makefile | 1
drivers/misc/msi-laptop.c | 386 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 413 insertions(+), 0 deletions(-)
diff --git a/MAINTAINERS b/MAINTAINERS
index 21116cc..6210002 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1949,6 +1949,13 @@ M: rubini@...vis.unipv.it
L: linux-kernel@...r.kernel.org
S: Maintained
+MSI LAPTOP SUPPORT
+P: Lennart Poettering
+M: mzxreary@...inter.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@...f.csiro.au
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..450c800
--- /dev/null
+++ b/drivers/misc/msi-laptop.c
@@ -0,0 +1,386 @@
+/*-*-linux-c-*-*/
+
+/* $Id: msi-laptop.c 115 2006-08-20 20:02:54Z lennart $ */
+
+/***
+ 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 "0.3"
+
+#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 > 8))
+ 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
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