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599a52d126
Per device data such as brightness belongs to the indivdual device and should therefore be separate from the the backlight operation function pointers. This patch splits the two types of data and allows simplifcation of some code. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
181 lines
4.0 KiB
C
181 lines
4.0 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 <asm/cpu/dac.h>
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#include <asm/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 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 __init hp680bl_probe(struct platform_device *pdev)
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{
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struct backlight_device *bd;
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bd = backlight_device_register ("hp680-bl", &pdev->dev, NULL,
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&hp680bl_ops);
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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.max_brightness = HP680_MAX_INTENSITY;
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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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hp680bl_data.brightness = 0;
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hp680bl_data.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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hp680bl_device = platform_device_alloc("hp680-bl", -1);
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if (!hp680bl_device)
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return -ENOMEM;
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ret = platform_device_add(hp680bl_device);
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if (ret) {
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platform_device_put(hp680bl_device);
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platform_driver_unregister(&hp680bl_driver);
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}
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}
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return ret;
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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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