179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*
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* Backlight Driver for HP Jornada 680
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*
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* Copyright (c) 2005 Andriy Skulysh
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*
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* Based on Sharp's Corgi Backlight Driver
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <cpu/dac.h>
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#include <mach/hp6xx.h>
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#include <asm/hd64461.h>
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#define HP680_MAX_INTENSITY 255
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#define HP680_DEFAULT_INTENSITY 10
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static int hp680bl_suspended;
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static int current_intensity = 0;
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static DEFINE_SPINLOCK(bl_lock);
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static void hp680bl_send_intensity(struct backlight_device *bd)
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{
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unsigned long flags;
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u16 v;
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int intensity = bd->props.brightness;
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if (bd->props.power != FB_BLANK_UNBLANK)
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intensity = 0;
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if (bd->props.fb_blank != FB_BLANK_UNBLANK)
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intensity = 0;
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if (hp680bl_suspended)
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intensity = 0;
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spin_lock_irqsave(&bl_lock, flags);
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if (intensity && current_intensity == 0) {
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sh_dac_enable(DAC_LCD_BRIGHTNESS);
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v = inw(HD64461_GPBDR);
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v &= ~HD64461_GPBDR_LCDOFF;
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outw(v, HD64461_GPBDR);
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sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
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} else if (intensity == 0 && current_intensity != 0) {
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sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
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sh_dac_disable(DAC_LCD_BRIGHTNESS);
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v = inw(HD64461_GPBDR);
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v |= HD64461_GPBDR_LCDOFF;
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outw(v, HD64461_GPBDR);
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} else if (intensity) {
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sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
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}
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spin_unlock_irqrestore(&bl_lock, flags);
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current_intensity = intensity;
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}
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#ifdef CONFIG_PM
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static int hp680bl_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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hp680bl_suspended = 1;
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hp680bl_send_intensity(bd);
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return 0;
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}
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static int hp680bl_resume(struct platform_device *pdev)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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hp680bl_suspended = 0;
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hp680bl_send_intensity(bd);
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return 0;
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}
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#else
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#define hp680bl_suspend NULL
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#define hp680bl_resume NULL
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#endif
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static int hp680bl_set_intensity(struct backlight_device *bd)
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{
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hp680bl_send_intensity(bd);
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return 0;
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}
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static int hp680bl_get_intensity(struct backlight_device *bd)
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{
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return current_intensity;
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}
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static const struct backlight_ops hp680bl_ops = {
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.get_brightness = hp680bl_get_intensity,
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.update_status = hp680bl_set_intensity,
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};
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static int __devinit hp680bl_probe(struct platform_device *pdev)
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{
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struct backlight_properties props;
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struct backlight_device *bd;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = HP680_MAX_INTENSITY;
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bd = backlight_device_register("hp680-bl", &pdev->dev, NULL,
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&hp680bl_ops, &props);
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if (IS_ERR(bd))
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return PTR_ERR(bd);
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platform_set_drvdata(pdev, bd);
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bd->props.brightness = HP680_DEFAULT_INTENSITY;
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hp680bl_send_intensity(bd);
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return 0;
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}
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static int hp680bl_remove(struct platform_device *pdev)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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bd->props.brightness = 0;
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bd->props.power = 0;
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hp680bl_send_intensity(bd);
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backlight_device_unregister(bd);
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return 0;
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}
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static struct platform_driver hp680bl_driver = {
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.probe = hp680bl_probe,
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.remove = hp680bl_remove,
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.suspend = hp680bl_suspend,
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.resume = hp680bl_resume,
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.driver = {
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.name = "hp680-bl",
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},
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};
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static struct platform_device *hp680bl_device;
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static int __init hp680bl_init(void)
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{
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int ret;
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ret = platform_driver_register(&hp680bl_driver);
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if (ret)
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return ret;
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hp680bl_device = platform_device_register_simple("hp680-bl", -1,
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NULL, 0);
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if (IS_ERR(hp680bl_device)) {
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platform_driver_unregister(&hp680bl_driver);
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return PTR_ERR(hp680bl_device);
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}
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return 0;
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}
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static void __exit hp680bl_exit(void)
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{
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platform_device_unregister(hp680bl_device);
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platform_driver_unregister(&hp680bl_driver);
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}
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module_init(hp680bl_init);
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module_exit(hp680bl_exit);
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MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>");
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MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
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MODULE_LICENSE("GPL");
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