72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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/* Quanta I2C Backlight Driver
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*
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* Copyright (C) 2009 Quanta Computer Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/*
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*
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* The Driver with I/O communications via the I2C Interface for ST15 platform.
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* And it is only working on the nuvoTon WPCE775x Embedded Controller.
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*
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*/
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#include <linux/module.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/wpce775x.h>
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#define EC_CMD_SET_BACKLIGHT 0xB1
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static void qci_backlight_store(struct led_classdev *led_cdev,
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enum led_brightness val);
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static struct platform_device *bl_pdev;
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static struct led_classdev lcd_backlight = {
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.name = "lcd-backlight",
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.brightness = 147,
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.brightness_set = qci_backlight_store,
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};
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static void qci_backlight_store(struct led_classdev *led_cdev,
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enum led_brightness val)
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{
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u16 value = val;
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wpce_smbus_write_word_data(EC_CMD_SET_BACKLIGHT, value);
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msleep(10);
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dev_dbg(&bl_pdev->dev, "[backlight_store] : value = %d\n", value);
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}
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static int __init qci_backlight_init(void)
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{
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int err = 0;
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bl_pdev = platform_device_register_simple("backlight", 0, NULL, 0);
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err = led_classdev_register(&bl_pdev->dev, &lcd_backlight);
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return err;
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}
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static void __exit qci_backlight_exit(void)
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{
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led_classdev_unregister(&lcd_backlight);
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platform_device_unregister(bl_pdev);
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}
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module_init(qci_backlight_init);
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module_exit(qci_backlight_exit);
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MODULE_AUTHOR("Quanta Computer Inc.");
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MODULE_DESCRIPTION("Quanta Embedded Controller I2C Backlight Driver");
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MODULE_LICENSE("GPL v2");
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