diff options
Diffstat (limited to 'drivers/video/backlight/hp680_bl.c')
| -rw-r--r-- | drivers/video/backlight/hp680_bl.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c new file mode 100644 index 000000000..8ea42b8d9 --- /dev/null +++ b/drivers/video/backlight/hp680_bl.c @@ -0,0 +1,175 @@ +/* + * Backlight Driver for HP Jornada 680 + * + * Copyright (c) 2005 Andriy Skulysh + * + * Based on Sharp's Corgi Backlight Driver + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include <linux/fb.h> +#include <linux/backlight.h> + +#include <cpu/dac.h> +#include <mach/hp6xx.h> +#include <asm/hd64461.h> + +#define HP680_MAX_INTENSITY 255 +#define HP680_DEFAULT_INTENSITY 10 + +static int hp680bl_suspended; +static int current_intensity; +static DEFINE_SPINLOCK(bl_lock); + +static void hp680bl_send_intensity(struct backlight_device *bd) +{ + unsigned long flags; + u16 v; + int intensity = bd->props.brightness; + + if (bd->props.power != FB_BLANK_UNBLANK) + intensity = 0; + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + intensity = 0; + if (hp680bl_suspended) + intensity = 0; + + spin_lock_irqsave(&bl_lock, flags); + if (intensity && current_intensity == 0) { + sh_dac_enable(DAC_LCD_BRIGHTNESS); + v = inw(HD64461_GPBDR); + v &= ~HD64461_GPBDR_LCDOFF; + outw(v, HD64461_GPBDR); + sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); + } else if (intensity == 0 && current_intensity != 0) { + sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); + sh_dac_disable(DAC_LCD_BRIGHTNESS); + v = inw(HD64461_GPBDR); + v |= HD64461_GPBDR_LCDOFF; + outw(v, HD64461_GPBDR); + } else if (intensity) { + sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); + } + spin_unlock_irqrestore(&bl_lock, flags); + + current_intensity = intensity; +} + + +#ifdef CONFIG_PM_SLEEP +static int hp680bl_suspend(struct device *dev) +{ + struct backlight_device *bd = dev_get_drvdata(dev); + + hp680bl_suspended = 1; + hp680bl_send_intensity(bd); + return 0; +} + +static int hp680bl_resume(struct device *dev) +{ + struct backlight_device *bd = dev_get_drvdata(dev); + + hp680bl_suspended = 0; + hp680bl_send_intensity(bd); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume); + +static int hp680bl_set_intensity(struct backlight_device *bd) +{ + hp680bl_send_intensity(bd); + return 0; +} + +static int hp680bl_get_intensity(struct backlight_device *bd) +{ + return current_intensity; +} + +static const struct backlight_ops hp680bl_ops = { + .get_brightness = hp680bl_get_intensity, + .update_status = hp680bl_set_intensity, +}; + +static int hp680bl_probe(struct platform_device *pdev) +{ + struct backlight_properties props; + struct backlight_device *bd; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = HP680_MAX_INTENSITY; + bd = devm_backlight_device_register(&pdev->dev, "hp680-bl", &pdev->dev, + NULL, &hp680bl_ops, &props); + if (IS_ERR(bd)) + return PTR_ERR(bd); + + platform_set_drvdata(pdev, bd); + + bd->props.brightness = HP680_DEFAULT_INTENSITY; + hp680bl_send_intensity(bd); + + return 0; +} + +static int hp680bl_remove(struct platform_device *pdev) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + bd->props.brightness = 0; + bd->props.power = 0; + hp680bl_send_intensity(bd); + + return 0; +} + +static struct platform_driver hp680bl_driver = { + .probe = hp680bl_probe, + .remove = hp680bl_remove, + .driver = { + .name = "hp680-bl", + .pm = &hp680bl_pm_ops, + }, +}; + +static struct platform_device *hp680bl_device; + +static int __init hp680bl_init(void) +{ + int ret; + + ret = platform_driver_register(&hp680bl_driver); + if (ret) + return ret; + hp680bl_device = platform_device_register_simple("hp680-bl", -1, + NULL, 0); + if (IS_ERR(hp680bl_device)) { + platform_driver_unregister(&hp680bl_driver); + return PTR_ERR(hp680bl_device); + } + return 0; +} + +static void __exit hp680bl_exit(void) +{ + platform_device_unregister(hp680bl_device); + platform_driver_unregister(&hp680bl_driver); +} + +module_init(hp680bl_init); +module_exit(hp680bl_exit); + +MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>"); +MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver"); +MODULE_LICENSE("GPL"); |