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Subject[PATCH 2/2] acpi,backlight: MSI S270 laptop support - driver
From: Lennart Poettering <mzxreary@0pointer.de>

The attached patch adds support for some special functions of MSI S270
laptops: LCD brightness control and Bluetooth/WLAN status.

This patch requires the ec_transaction() patch sent before.

The driver registers a few files in /proc/acpi/s270/. In addition it
registers itself in the backlight subsystem and is available to
userspace in /sys/class/backlight/s270/.

Based on 2.6.17

Please comment and/or apply!

Lennart

Signed-off-by: Lennart Poettering <mzxreary@0pointer.de>
---
--- linux-source-2.6.17/drivers/acpi/s270.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-source-2.6.17.lennart/drivers/acpi/s270.c 2006-08-10 00:58:25.000000000 +0200
@@ -0,0 +1,375 @@
+/*-*-linux-c-*-*/
+
+/* $Id: s270.c 107 2006-08-09 22:58:25Z 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.
+***/
+
+/*
+ * s270.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 /proc/acpi/s270/:
+ *
+ * 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 /proc files the driver registers itself in the
+ * Linux backlight control subsystem and is available to userspace under
+ * /sys/class/backlight/s270/.
+ *
+ * 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/proc_fs.h>
+#include <linux/autoconf.h>
+#include <asm/uaccess.h>
+
+#define MSI_LCD_LEVEL_MAX 9
+
+#define MSI_EC_COMMAND_WIRELESS 0x10
+#define MSI_EC_COMMAND_LCD_LEVEL 0x11
+
+#define PROCFS_S270_PREFIX "s270"
+#define PROCFS_S270_LCD_LEVEL "lcd_level"
+#define PROCFS_S270_AUTO_BRIGHTNESS "auto_brightness"
+#define PROCFS_S270_WLAN "wlan"
+#define PROCFS_S270_BLUETOOTH "bluetooth"
+
+static int force;
+module_param(force, int, 0);
+
+/*** Hardware access ***/
+
+static const uint8_t lcd_table[MSI_LCD_LEVEL_MAX] = {
+ 0x00, 0x1f, 0x3e, 0x5d, 0x7c, 0x9b, 0xba, 0xd9, 0xf8
+};
+
+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] = lcd_table[level];
+
+ return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0);
+}
+
+static int get_lcd_level(void) {
+ u8 wdata = 0, rdata;
+ int i, result;
+
+ if ((result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1)) < 0)
+ return result;
+
+ for (i = 0; i < MSI_LCD_LEVEL_MAX; i++)
+ if (lcd_table[i] == rdata)
+ return i;
+
+ return -EIO;
+}
+
+static int get_auto_brightness(void) {
+ u8 wdata = 4, rdata;
+ int result;
+
+ if ((result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1)) < 0)
+ return result;
+
+ return !!(rdata & 8);
+}
+
+static int set_auto_brightness(int enable) {
+ u8 wdata[2], rdata;
+ int result;
+
+ wdata[0] = 4;
+
+ if ((result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1)) < 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;
+
+ if ((result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1)) < 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 s270bl_props = {
+ .owner = THIS_MODULE,
+ .get_brightness = bl_get_brightness,
+ .update_status = bl_update_status,
+ .max_brightness = MSI_LCD_LEVEL_MAX,
+};
+
+static struct backlight_device *s270bl_device;
+
+/*** procfs stuff ***/
+
+static struct proc_dir_entry *s270_procfs_dir;
+
+struct s270_procfs_item {
+ const char *name;
+ mode_t mode;
+ int (*read_func)(void);
+ int (*write_func)(int value);
+};
+
+static int procfs_wlan_read_func(void) {
+ int b, ret;
+
+ if ((ret = get_wireless_state(&b, NULL)) < 0)
+ return ret;
+
+ return b;
+}
+
+static int procfs_bluetooth_read_func(void) {
+ int b, ret;
+
+ if ((ret = get_wireless_state(NULL, &b)) < 0)
+ return ret;
+
+ return b;
+}
+
+static int dispatch_read(char *page, char **start, off_t off, int count, int *eof, void *data) {
+ const struct s270_procfs_item *item = data;
+ int value;
+
+ if (!item || !item->read_func)
+ return -EINVAL;
+
+ if ((value = item->read_func()) < 0)
+ return value;
+
+ if (off > 0) {
+ *eof = 1;
+ return 0;
+ }
+
+ return sprintf(page, "%i\n", value);
+}
+
+static int dispatch_write(struct file *file, const char __user *userbuf, unsigned long count, void *data) {
+ const struct s270_procfs_item *item = data;
+ char *kernbuf;
+ int value, ret;
+
+ if (!item || !item->write_func)
+ return -EINVAL;
+
+ if (!(kernbuf = kmalloc(count + 1, GFP_KERNEL)))
+ return -ENOMEM;
+
+ if (copy_from_user(kernbuf, userbuf, count)) {
+ kfree(kernbuf);
+ return -EFAULT;
+ }
+
+ kernbuf[count] = 0;
+
+ if (sscanf(kernbuf, "%i", &value) != 1) {
+ kfree(kernbuf);
+ return -EINVAL;
+ }
+
+ kfree(kernbuf);
+
+ if ((ret = item->write_func(value)) < 0)
+ return ret;
+
+ return count;
+}
+
+static const struct s270_procfs_item s270_procfs_items[] = {
+ {
+ PROCFS_S270_LCD_LEVEL,
+ S_IFREG|S_IRUGO|S_IWUSR,
+ get_lcd_level,
+ set_lcd_level
+ }, {
+ PROCFS_S270_AUTO_BRIGHTNESS,
+ S_IFREG|S_IRUGO|S_IWUSR,
+ get_auto_brightness,
+ set_auto_brightness
+ }, {
+ PROCFS_S270_WLAN,
+ S_IFREG|S_IRUGO,
+ procfs_wlan_read_func,
+ NULL
+ }, {
+ PROCFS_S270_BLUETOOTH,
+ S_IFREG|S_IRUGO,
+ procfs_bluetooth_read_func,
+ NULL
+ }, { }
+};
+
+static int __init add_procfs_files(void) {
+ const struct s270_procfs_item *item;
+
+ for (item = s270_procfs_items; item->name; item++) {
+ struct proc_dir_entry *proc;
+
+ if (!(proc = create_proc_read_entry(
+ item->name,
+ item->mode,
+ s270_procfs_dir,
+ dispatch_read,
+ (void*) item)))
+ return -ENOMEM;
+
+ proc->owner = THIS_MODULE;
+ proc->write_proc = dispatch_write;
+ }
+
+ return 0;
+}
+
+static void __exit remove_procfs_files(void) {
+ const struct s270_procfs_item *item;
+
+ for (item = s270_procfs_items; item->name; item++)
+ remove_proc_entry(item->name, s270_procfs_dir);
+}
+
+/*** Initialization ***/
+
+static struct dmi_system_id __initdata s270_dmi_table[] = { {
+ .ident = "MSI S270",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),
+ }
+}, { } };
+
+static int __init init_s270(void) {
+ int ret;
+
+ if (acpi_disabled)
+ return -ENODEV;
+
+ if (!force && !dmi_check_system(s270_dmi_table))
+ return -ENODEV;
+
+ s270bl_device = backlight_device_register("s270", NULL, &s270bl_props);
+
+ if (IS_ERR(s270bl_device))
+ return PTR_ERR(s270bl_device);
+
+ if (!(s270_procfs_dir = proc_mkdir(PROCFS_S270_PREFIX, acpi_root_dir))) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ s270_procfs_dir->owner = THIS_MODULE;
+
+ if ((ret = add_procfs_files()) < 0)
+ goto fail;
+
+ /* Disable automatic brightness control by default, because
+ * this module was probably loaded to do brightness control in
+ * software. */
+ set_auto_brightness(0);
+
+ return 0;
+
+fail:
+
+ if (s270_procfs_dir) {
+ remove_procfs_files();
+ remove_proc_entry(PROCFS_S270_PREFIX, acpi_root_dir);
+ }
+
+ if (s270bl_device)
+ backlight_device_unregister(s270bl_device);
+
+ return ret;
+}
+
+static void __exit cleanup_s270(void) {
+
+ if (s270_procfs_dir) {
+ remove_procfs_files();
+ remove_proc_entry(PROCFS_S270_PREFIX, acpi_root_dir);
+ }
+
+ if (s270bl_device)
+ backlight_device_unregister(s270bl_device);
+
+ /* Enable automatic brightness control again */
+ set_auto_brightness(1);
+}
+
+module_init(init_s270);
+module_exit(cleanup_s270);
+
+MODULE_AUTHOR("Lennart Poettering");
+MODULE_DESCRIPTION("MSI S270 Laptop Support");
+MODULE_VERSION("0.1");
+MODULE_LICENSE("GPL");
--- linux-source-2.6.17/drivers/acpi/Makefile 2006-06-18 03:49:35.000000000 +0200
+++ linux-source-2.6.17.lennart/drivers/acpi/Makefile 2006-08-10 01:41:58.000000000 +0200
@@ -55,5 +55,6 @@ obj-$(CONFIG_ACPI_NUMA) += numa.o
obj-$(CONFIG_ACPI_ASUS) += asus_acpi.o
obj-$(CONFIG_ACPI_IBM) += ibm_acpi.o
obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o
+obj-$(CONFIG_ACPI_MSI_S270) += s270.o
obj-y += scan.o motherboard.o
obj-$(CONFIG_ACPI_HOTPLUG_MEMORY) += acpi_memhotplug.o
--- linux-source-2.6.17/drivers/acpi/Kconfig 2006-06-18 03:49:35.000000000 +0200
+++ linux-source-2.6.17.lennart/drivers/acpi/Kconfig 2006-08-10 01:40:43.000000000 +0200
@@ -243,6 +243,19 @@ config ACPI_TOSHIBA
If you have a legacy free Toshiba laptop (such as the Libretto L1
series), say Y.

+config ACPI_MSI_S270
+ tristate "MSI S270 Laptop Extras"
+ depends on X86
+ depends on BACKLIGHT_CLASS_DEVICE
+ ---help---
+ This is a Linux ACPI driver for MSI S270 laptops. 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.
+
config ACPI_CUSTOM_DSDT
bool "Include Custom DSDT"
depends on !STANDALONE
--- linux-source-2.6.17/MAINTAINERS 2006-06-18 03:49:35.000000000 +0200
+++ linux-source-2.6.17.lennart/MAINTAINERS 2006-08-10 01:16:50.000000000 +0200
@@ -1882,6 +1882,13 @@ M: rubini@ipvvis.unipv.it
L: linux-kernel@vger.kernel.org
S: Maintained

+MSI S270 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
-
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