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path: root/drivers/video/backlight/hp680_bl.c
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Diffstat (limited to 'drivers/video/backlight/hp680_bl.c')
-rw-r--r--drivers/video/backlight/hp680_bl.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
new file mode 100644
index 00000000000..95da4c9ed1f
--- /dev/null
+++ b/drivers/video/backlight/hp680_bl.c
@@ -0,0 +1,189 @@
+/*
+ * 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/device.h>
+#include <linux/spinlock.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#include <asm/cpu/dac.h>
+#include <asm/hp6xx/hp6xx.h>
+#include <asm/hd64461/hd64461.h>
+
+#define HP680_MAX_INTENSITY 255
+#define HP680_DEFAULT_INTENSITY 10
+
+static int hp680bl_powermode = FB_BLANK_UNBLANK;
+static int current_intensity = 0;
+static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;
+
+static void hp680bl_send_intensity(int intensity)
+{
+ unsigned long flags;
+
+ if (hp680bl_powermode != FB_BLANK_UNBLANK)
+ intensity = 0;
+
+ spin_lock_irqsave(&bl_lock, flags);
+ sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
+ spin_unlock_irqrestore(&bl_lock, flags);
+}
+
+static void hp680bl_blank(int blank)
+{
+ u16 v;
+
+ switch(blank) {
+
+ case FB_BLANK_NORMAL:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_POWERDOWN:
+ if (hp680bl_powermode == FB_BLANK_UNBLANK) {
+ hp680bl_send_intensity(0);
+ hp680bl_powermode = blank;
+ sh_dac_disable(DAC_LCD_BRIGHTNESS);
+ v = inw(HD64461_GPBDR);
+ v |= HD64461_GPBDR_LCDOFF;
+ outw(v, HD64461_GPBDR);
+ }
+ break;
+ case FB_BLANK_UNBLANK:
+ if (hp680bl_powermode != FB_BLANK_UNBLANK) {
+ sh_dac_enable(DAC_LCD_BRIGHTNESS);
+ v = inw(HD64461_GPBDR);
+ v &= ~HD64461_GPBDR_LCDOFF;
+ outw(v, HD64461_GPBDR);
+ hp680bl_powermode = blank;
+ hp680bl_send_intensity(current_intensity);
+ }
+ break;
+ }
+}
+
+#ifdef CONFIG_PM
+static int hp680bl_suspend(struct device *dev, pm_message_t state, u32 level)
+{
+ if (level == SUSPEND_POWER_DOWN)
+ hp680bl_blank(FB_BLANK_POWERDOWN);
+ return 0;
+}
+
+static int hp680bl_resume(struct device *dev, u32 level)
+{
+ if (level == RESUME_POWER_ON)
+ hp680bl_blank(FB_BLANK_UNBLANK);
+ return 0;
+}
+#else
+#define hp680bl_suspend NULL
+#define hp680bl_resume NULL
+#endif
+
+
+static int hp680bl_set_power(struct backlight_device *bd, int state)
+{
+ hp680bl_blank(state);
+ return 0;
+}
+
+static int hp680bl_get_power(struct backlight_device *bd)
+{
+ return hp680bl_powermode;
+}
+
+static int hp680bl_set_intensity(struct backlight_device *bd, int intensity)
+{
+ if (intensity > HP680_MAX_INTENSITY)
+ intensity = HP680_MAX_INTENSITY;
+ hp680bl_send_intensity(intensity);
+ current_intensity = intensity;
+ return 0;
+}
+
+static int hp680bl_get_intensity(struct backlight_device *bd)
+{
+ return current_intensity;
+}
+
+static struct backlight_properties hp680bl_data = {
+ .owner = THIS_MODULE,
+ .get_power = hp680bl_get_power,
+ .set_power = hp680bl_set_power,
+ .max_brightness = HP680_MAX_INTENSITY,
+ .get_brightness = hp680bl_get_intensity,
+ .set_brightness = hp680bl_set_intensity,
+};
+
+static struct backlight_device *hp680_backlight_device;
+
+static int __init hp680bl_probe(struct device *dev)
+{
+ hp680_backlight_device = backlight_device_register ("hp680-bl",
+ NULL, &hp680bl_data);
+ if (IS_ERR (hp680_backlight_device))
+ return PTR_ERR (hp680_backlight_device);
+
+ hp680bl_set_intensity(NULL, HP680_DEFAULT_INTENSITY);
+
+ return 0;
+}
+
+static int hp680bl_remove(struct device *dev)
+{
+ backlight_device_unregister(hp680_backlight_device);
+
+ return 0;
+}
+
+static struct device_driver hp680bl_driver = {
+ .name = "hp680-bl",
+ .bus = &platform_bus_type,
+ .probe = hp680bl_probe,
+ .remove = hp680bl_remove,
+ .suspend = hp680bl_suspend,
+ .resume = hp680bl_resume,
+};
+
+static struct platform_device hp680bl_device = {
+ .name = "hp680-bl",
+ .id = -1,
+};
+
+static int __init hp680bl_init(void)
+{
+ int ret;
+
+ ret=driver_register(&hp680bl_driver);
+ if (!ret) {
+ ret = platform_device_register(&hp680bl_device);
+ if (ret)
+ driver_unregister(&hp680bl_driver);
+ }
+ return ret;
+}
+
+static void __exit hp680bl_exit(void)
+{
+ platform_device_unregister(&hp680bl_device);
+ driver_unregister(&hp680bl_driver);
+}
+
+module_init(hp680bl_init);
+module_exit(hp680bl_exit);
+
+MODULE_AUTHOR("Andriy Skulysh <askulysh@image.kiev.ua>");
+MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
+MODULE_LICENSE("GPL");