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chromebook_kb_backlight.c
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/*
* chromebook_kb_backlight.c - Driver to Chromebook keyboard backlight devices.
*
* Author : Benson Leung <[email protected]>
*
* Copyright (C) 2012 Google, Inc.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#ifdef KB_BACKLIGHT
#define DEVICE_NAME "chromeos-keyboard-backlight"
#else
#define DEVICE_NAME "chromeos-keyboard-leds"
#endif
static struct platform_device *kb_backlight_device;
static int __init setup_keyboard_backlight(const struct dmi_system_id *id)
{
kb_backlight_device =
platform_device_register_simple(DEVICE_NAME,
-1, NULL, 0);
if (IS_ERR(kb_backlight_device)) {
pr_warn("Error registering Chromebook keyboard LEDs.\n");
kb_backlight_device = NULL;
}
return 0;
}
static struct dmi_system_id __initconst chromebook_kb_backlight_dmi_table[] = {
{
.ident = "Chromebook pixel - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
},
.callback = setup_keyboard_backlight,
},
{
.ident = "Toshiba Chromebook 2 - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Gandof"),
},
.callback = setup_keyboard_backlight,
},
{
.ident = "Toshiba Chromebook 2 - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Gandof"),
},
.callback = setup_keyboard_backlight,
},
{
.ident = "Dell Chromebook 13 - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Lulu"),
},
.callback = setup_keyboard_backlight,
},
{
.ident = "Dell Chromebook 13 - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Google"),
DMI_MATCH(DMI_PRODUCT_NAME, "Lulu"),
},
.callback = setup_keyboard_backlight,
},
{
.ident = "HP Chromebook 13 G1 - Keyboard backlight",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "Chell"),
},
.callback = setup_keyboard_backlight,
},
{ }
};
MODULE_DEVICE_TABLE(dmi, chromebook_kb_backlight_dmi_table);
static int __init chromebook_kb_backlight_init(void)
{
if (!dmi_check_system(chromebook_kb_backlight_dmi_table)) {
pr_debug("%s unsupported system.\n", __func__);
return -ENODEV;
}
return 0;
}
static void __exit chromebook_kb_backlight_exit(void)
{
if (kb_backlight_device)
platform_device_unregister(kb_backlight_device);
}
module_init(chromebook_kb_backlight_init);
module_exit(chromebook_kb_backlight_exit);
MODULE_DESCRIPTION("Chromebook Keyboard backlight driver");
MODULE_AUTHOR("Benson Leung <[email protected]>");
MODULE_LICENSE("GPL");