1 files changed, 437 insertions, 0 deletions

diff --git a/drivers/misc/compal-laptop.c b/drivers/misc/compal-laptop.c
new file mode 100644
index 000000000000..0c1f5875fbb9
--- /dev/null
+++ b/drivers/misc/compal-laptop.c
@@ -0,0 +1,437 @@
+/*-*-linux-c-*-*/
+
+/*
+  Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>
+
+  based on MSI driver
+
+  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.
+ */
+
+/*
+ * comapl-laptop.c - Compal laptop support.
+ *
+ * This driver exports a few files in /sys/devices/platform/compal-laptop/:
+ *
+ *   lcd_level - Screen brightness: contains a single integer in the
+ *   range 0..7. (rw)
+ *
+ *   wlan - wlan subsystem state: contains 0 or 1 (rw)
+ *
+ *   bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
+ *
+ *   raw - raw value taken from embedded controller register (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/compal-laptop/.
+ *
+ * This driver might work on other laptops produced by Compal. 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 IFL90.
+ */
+
+#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 COMPAL_DRIVER_VERSION "0.2.5"
+
+#define COMPAL_LCD_LEVEL_MAX 8
+
+#define COMPAL_EC_COMMAND_WIRELESS 0xBB
+#define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9
+
+#define KILLSWITCH_MASK 0x10
+#define WLAN_MASK       0x01
+#define BT_MASK         0x02
+
+static int force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
+
+/* Hardware access */
+
+static int set_lcd_level(int level)
+{
+        if (level < 0 || level >= COMPAL_LCD_LEVEL_MAX)
+                return -EINVAL;
+
+        ec_write(COMPAL_EC_COMMAND_LCD_LEVEL, level);
+
+        return 0;
+}
+
+static int get_lcd_level(void)
+{
+        u8 result;
+
+        ec_read(COMPAL_EC_COMMAND_LCD_LEVEL, &result);
+
+        return (int) result;
+}
+
+static int set_wlan_state(int state)
+{
+        u8 result, value;
+
+        ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+        if ((result & KILLSWITCH_MASK) == 0)
+                return -EINVAL;
+        else {
+                if (state)
+                        value = (u8) (result | WLAN_MASK);
+                else
+                        value = (u8) (result & ~WLAN_MASK);
+                ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
+        }
+
+        return 0;
+}
+
+static int set_bluetooth_state(int state)
+{
+        u8 result, value;
+
+        ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+        if ((result & KILLSWITCH_MASK) == 0)
+                return -EINVAL;
+        else {
+                if (state)
+                        value = (u8) (result | BT_MASK);
+                else
+                        value = (u8) (result & ~BT_MASK);
+                ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
+        }
+
+        return 0;
+}
+
+static int get_wireless_state(int *wlan, int *bluetooth)
+{
+        u8 result;
+
+        ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+        if (wlan) {
+                if ((result & KILLSWITCH_MASK) == 0)
+                        *wlan = 0;
+                else
+                        *wlan = result & WLAN_MASK;
+        }
+
+        if (bluetooth) {
+                if ((result & KILLSWITCH_MASK) == 0)
+                        *bluetooth = 0;
+                else
+                        *bluetooth = (result & BT_MASK) >> 1;
+        }
+
+        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_ops compalbl_ops = {
+        .get_brightness = bl_get_brightness,
+        .update_status  = bl_update_status,
+};
+
+static struct backlight_device *compalbl_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_raw(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        u8 result;
+
+        ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+        return sprintf(buf, "%i\n", result);
+}
+
+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 >= COMPAL_LCD_LEVEL_MAX))
+                return -EINVAL;
+
+        ret = set_lcd_level(level);
+        if (ret < 0)
+                return ret;
+
+        return count;
+}
+
+static ssize_t store_wlan_state(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        int state, ret;
+
+        if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
+                return -EINVAL;
+
+        ret = set_wlan_state(state);
+        if (ret < 0)
+                return ret;
+
+        return count;
+}
+
+static ssize_t store_bluetooth_state(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        int state, ret;
+
+        if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
+                return -EINVAL;
+
+        ret = set_bluetooth_state(state);
+        if (ret < 0)
+                return ret;
+
+        return count;
+}
+
+static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
+static DEVICE_ATTR(bluetooth, 0644, show_bluetooth, store_bluetooth_state);
+static DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan_state);
+static DEVICE_ATTR(raw, 0444, show_raw, NULL);
+
+static struct attribute *compal_attributes[] = {
+        &dev_attr_lcd_level.attr,
+        &dev_attr_bluetooth.attr,
+        &dev_attr_wlan.attr,
+        &dev_attr_raw.attr,
+        NULL
+};
+
+static struct attribute_group compal_attribute_group = {
+        .attrs = compal_attributes
+};
+
+static struct platform_driver compal_driver = {
+        .driver = {
+                .name = "compal-laptop",
+                .owner = THIS_MODULE,
+        }
+};
+
+static struct platform_device *compal_device;
+
+/* Initialization */
+
+static int dmi_check_cb(const struct dmi_system_id *id)
+{
+        printk(KERN_INFO "compal-laptop: Identified laptop model '%s'.\n",
+                id->ident);
+
+        return 0;
+}
+
+static struct dmi_system_id __initdata compal_dmi_table[] = {
+        {
+                .ident = "FL90/IFL90",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
+                        DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
+                },
+                .callback = dmi_check_cb
+        },
+        {
+                .ident = "FL90/IFL90",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
+                        DMI_MATCH(DMI_BOARD_VERSION, "REFERENCE"),
+                },
+                .callback = dmi_check_cb
+        },
+        {
+                .ident = "FL91/IFL91",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_NAME, "IFL91"),
+                        DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
+                },
+                .callback = dmi_check_cb
+        },
+        {
+                .ident = "FL92/JFL92",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_NAME, "JFL92"),
+                        DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
+                },
+                .callback = dmi_check_cb
+        },
+        {
+                .ident = "FT00/IFT00",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_NAME, "IFT00"),
+                        DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
+                },
+                .callback = dmi_check_cb
+        },
+        { }
+};
+
+static int __init compal_init(void)
+{
+        int ret;
+
+        if (acpi_disabled)
+                return -ENODEV;
+
+        if (!force && !dmi_check_system(compal_dmi_table))
+                return -ENODEV;
+
+        /* Register backlight stuff */
+
+        compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
+                                                &compalbl_ops);
+        if (IS_ERR(compalbl_device))
+                return PTR_ERR(compalbl_device);
+
+        compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
+
+        ret = platform_driver_register(&compal_driver);
+        if (ret)
+                goto fail_backlight;
+
+        /* Register platform stuff */
+
+        compal_device = platform_device_alloc("compal-laptop", -1);
+        if (!compal_device) {
+                ret = -ENOMEM;
+                goto fail_platform_driver;
+        }
+
+        ret = platform_device_add(compal_device);
+        if (ret)
+                goto fail_platform_device1;
+
+        ret = sysfs_create_group(&compal_device->dev.kobj,
+                &compal_attribute_group);
+        if (ret)
+                goto fail_platform_device2;
+
+        printk(KERN_INFO "compal-laptop: driver "COMPAL_DRIVER_VERSION
+                " successfully loaded.\n");
+
+        return 0;
+
+fail_platform_device2:
+
+        platform_device_del(compal_device);
+
+fail_platform_device1:
+
+        platform_device_put(compal_device);
+
+fail_platform_driver:
+
+        platform_driver_unregister(&compal_driver);
+
+fail_backlight:
+
+        backlight_device_unregister(compalbl_device);
+
+        return ret;
+}
+
+static void __exit compal_cleanup(void)
+{
+
+        sysfs_remove_group(&compal_device->dev.kobj, &compal_attribute_group);
+        platform_device_unregister(compal_device);
+        platform_driver_unregister(&compal_driver);
+        backlight_device_unregister(compalbl_device);
+
+        printk(KERN_INFO "compal-laptop: driver unloaded.\n");
+}
+
+module_init(compal_init);
+module_exit(compal_cleanup);
+
+MODULE_AUTHOR("Cezary Jackiewicz");
+MODULE_DESCRIPTION("Compal Laptop Support");
+MODULE_VERSION(COMPAL_DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS("dmi:*:rnIFL90:rvrIFT00:*");
+MODULE_ALIAS("dmi:*:rnIFL90:rvrREFERENCE:*");
+MODULE_ALIAS("dmi:*:rnIFL91:rvrIFT00:*");
+MODULE_ALIAS("dmi:*:rnJFL92:rvrIFT00:*");
+MODULE_ALIAS("dmi:*:rnIFT00:rvrIFT00:*");