summaryrefslogtreecommitdiffstats
path: root/drivers/video/backlight/hp680_bl.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/backlight/hp680_bl.c')
-rw-r--r--drivers/video/backlight/hp680_bl.c171
1 files changed, 171 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..9123c33de
--- /dev/null
+++ b/drivers/video/backlight/hp680_bl.c
@@ -0,0 +1,171 @@
+/*
+ * 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 = backlight_get_brightness(bd);
+
+ 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");