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171 lines
3.9 KiB
171 lines
3.9 KiB
/* |
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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; |
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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 = backlight_get_brightness(bd); |
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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_SLEEP |
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static int hp680bl_suspend(struct device *dev) |
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{ |
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struct backlight_device *bd = dev_get_drvdata(dev); |
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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 device *dev) |
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{ |
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struct backlight_device *bd = dev_get_drvdata(dev); |
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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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#endif |
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static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume); |
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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 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.type = BACKLIGHT_RAW; |
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props.max_brightness = HP680_MAX_INTENSITY; |
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bd = devm_backlight_device_register(&pdev->dev, "hp680-bl", &pdev->dev, |
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NULL, &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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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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.driver = { |
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.name = "hp680-bl", |
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.pm = &hp680bl_pm_ops, |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver"); |
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MODULE_LICENSE("GPL");
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