/* * 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 #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver"); MODULE_LICENSE("GPL"); >space:mode:
authorThomas Gleixner <tglx@linutronix.de>2017-01-10 14:01:05 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-16 13:20:05 +0100
commit4205e4786d0b9fc3b4fec7b1910cf645a0468307 (patch)
tree685ccb486409197b936c785eb9d173c3edff45a1 /sound/soc/codecs/wm8996.h
parent7e164ce4e8ecd7e9a58a83750bd3ee03125df154 (diff)
cpu/hotplug: Provide dynamic range for prepare stage
Mathieu reported that the LTTNG modules are broken as of 4.10-rc1 due to the removal of the cpu hotplug notifiers. Usually I don't care much about out of tree modules, but LTTNG is widely used in distros. There are two ways to solve that: 1) Reserve a hotplug state for LTTNG 2) Add a dynamic range for the prepare states. While #1 is the simplest solution, #2 is the proper one as we can convert in tree users, which do not care about ordering, to the dynamic range as well. Add a dynamic range which allows LTTNG to request states in the prepare stage. Reported-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Sewior <bigeasy@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701101353010.3401@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'sound/soc/codecs/wm8996.h')