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path: root/drivers/video/backlight/da903x_bl.c
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Diffstat (limited to 'drivers/video/backlight/da903x_bl.c')
-rw-r--r--drivers/video/backlight/da903x_bl.c203
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
new file mode 100644
index 00000000000..93bb4340cc6
--- /dev/null
+++ b/drivers/video/backlight/da903x_bl.c
@@ -0,0 +1,203 @@
+/*
+ * Backlight driver for Dialog Semiconductor DA9030/DA9034
+ *
+ * Copyright (C) 2008 Compulab, Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/mfd/da903x.h>
+
+#define DA9030_WLED_CONTROL 0x25
+#define DA9030_WLED_CP_EN (1 << 6)
+#define DA9030_WLED_TRIM(x) ((x) & 0x7)
+
+#define DA9034_WLED_CONTROL1 0x3C
+#define DA9034_WLED_CONTROL2 0x3D
+
+#define DA9034_WLED_BOOST_EN (1 << 5)
+
+#define DA9030_MAX_BRIGHTNESS 7
+#define DA9034_MAX_BRIGHTNESS 0x7f
+
+struct da903x_backlight_data {
+ struct device *da903x_dev;
+ int id;
+ int current_brightness;
+};
+
+static int da903x_backlight_set(struct backlight_device *bl, int brightness)
+{
+ struct da903x_backlight_data *data = bl_get_data(bl);
+ struct device *dev = data->da903x_dev;
+ uint8_t val;
+ int ret = 0;
+
+ switch (data->id) {
+ case DA9034_ID_WLED:
+ ret = da903x_update(dev, DA9034_WLED_CONTROL1,
+ brightness, 0x7f);
+ if (ret)
+ return ret;
+
+ if (data->current_brightness && brightness == 0)
+ ret = da903x_clr_bits(dev,
+ DA9034_WLED_CONTROL2,
+ DA9034_WLED_BOOST_EN);
+
+ if (data->current_brightness == 0 && brightness)
+ ret = da903x_set_bits(dev,
+ DA9034_WLED_CONTROL2,
+ DA9034_WLED_BOOST_EN);
+ break;
+ case DA9030_ID_WLED:
+ val = DA9030_WLED_TRIM(brightness);
+ val |= brightness ? DA9030_WLED_CP_EN : 0;
+ ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
+ break;
+ }
+
+ if (ret)
+ return ret;
+
+ data->current_brightness = brightness;
+ return 0;
+}
+
+static int da903x_backlight_update_status(struct backlight_device *bl)
+{
+ int brightness = bl->props.brightness;
+
+ if (bl->props.power != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ return da903x_backlight_set(bl, brightness);
+}
+
+static int da903x_backlight_get_brightness(struct backlight_device *bl)
+{
+ struct da903x_backlight_data *data = bl_get_data(bl);
+ return data->current_brightness;
+}
+
+static struct backlight_ops da903x_backlight_ops = {
+ .update_status = da903x_backlight_update_status,
+ .get_brightness = da903x_backlight_get_brightness,
+};
+
+static int da903x_backlight_probe(struct platform_device *pdev)
+{
+ struct da903x_backlight_data *data;
+ struct backlight_device *bl;
+ int max_brightness;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ switch (pdev->id) {
+ case DA9030_ID_WLED:
+ max_brightness = DA9030_MAX_BRIGHTNESS;
+ break;
+ case DA9034_ID_WLED:
+ max_brightness = DA9034_MAX_BRIGHTNESS;
+ break;
+ default:
+ dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
+ pdev->id);
+ kfree(data);
+ return -EINVAL;
+ }
+
+ data->id = pdev->id;
+ data->da903x_dev = pdev->dev.parent;
+ data->current_brightness = 0;
+
+ bl = backlight_device_register(pdev->name, data->da903x_dev,
+ data, &da903x_backlight_ops);
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ kfree(data);
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness = max_brightness;
+ bl->props.brightness = max_brightness;
+
+ platform_set_drvdata(pdev, bl);
+ backlight_update_status(bl);
+ return 0;
+}
+
+static int da903x_backlight_remove(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct da903x_backlight_data *data = bl_get_data(bl);
+
+ backlight_device_unregister(bl);
+ kfree(data);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int da903x_backlight_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ return da903x_backlight_set(bl, 0);
+}
+
+static int da903x_backlight_resume(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+
+ backlight_update_status(bl);
+ return 0;
+}
+#else
+#define da903x_backlight_suspend NULL
+#define da903x_backlight_resume NULL
+#endif
+
+static struct platform_driver da903x_backlight_driver = {
+ .driver = {
+ .name = "da903x-backlight",
+ .owner = THIS_MODULE,
+ },
+ .probe = da903x_backlight_probe,
+ .remove = da903x_backlight_remove,
+ .suspend = da903x_backlight_suspend,
+ .resume = da903x_backlight_resume,
+};
+
+static int __init da903x_backlight_init(void)
+{
+ return platform_driver_register(&da903x_backlight_driver);
+}
+module_init(da903x_backlight_init);
+
+static void __exit da903x_backlight_exit(void)
+{
+ platform_driver_unregister(&da903x_backlight_driver);
+}
+module_exit(da903x_backlight_exit);
+
+MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
+ "Mike Rapoport <mike@compulab.co.il>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da903x-backlight");