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linux/drivers/misc/compal-laptop.c
Thomas Renninger 29454f1712 compal: fingers off backlight if video.ko is serving this functionality 
Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-11-08 00:27:27 -05:00

406 lines
8.7 KiB
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/*-*-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/:
*
* 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 FL9x.
*/
#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 "0.2.6"
#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 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(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_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 */
if (!acpi_video_backlight_support()) {
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:*");
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