backlight: Add support for the Avionic Design Xanthos backlight device.

This patch adds support for the backlight device found on Avionic Design
Xanthos-based boards.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index c0d4a53..22a4994 100644 (file)
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -243,3 +243,11 @@ config BACKLIGHT_WM831X
        help
          If you have a backlight driven by the ISINK and DCDC of a
          WM831x PMIC say y to enable the backlight driver for it.
+
+config BACKLIGHT_ADX
+       tristate "Avionic Design Xanthos Backlight Driver"
+       depends on BACKLIGHT_CLASS_DEVICE && ARCH_PXA_ADX
+       default y
+       help
+         Say Y to enable the backlight driver on Avionic Design Xanthos-based
+         boards.

diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 0abc014..a483709 100644 (file)
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -26,4 +26,4 @@ obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
 obj-$(CONFIG_BACKLIGHT_TOSA)   += tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
-
+obj-$(CONFIG_BACKLIGHT_ADX)    += adx_bl.o

diff --git a/drivers/video/backlight/adx_bl.c b/drivers/video/backlight/adx_bl.c
new file mode 100644 (file)
index 0000000..2c3bdfc
--- /dev/null
+++ b/drivers/video/backlight/adx_bl.c
@@ -0,0 +1,178 @@
+/*
+ * linux/drivers/video/backlight/adx.c
+ *
+ * Copyright (C) 2009 Avionic Design GmbH
+ *
+ * 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.
+ *
+ * Written by Thierry Reding <thierry.reding@avionic-design.de>
+ */
+
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/* register definitions */
+#define ADX_BACKLIGHT_CONTROL          0x00
+#define ADX_BACKLIGHT_CONTROL_ENABLE   (1 << 0)
+#define ADX_BACKLIGHT_BRIGHTNESS       0x08
+#define ADX_BACKLIGHT_STATUS           0x10
+#define ADX_BACKLIGHT_ERROR            0x18
+
+struct adxbl {
+       void __iomem *base;
+};
+
+static int adx_backlight_update_status(struct backlight_device *bldev)
+{
+       struct adxbl *bl = bl_get_data(bldev);
+       u32 value;
+
+       value = bldev->props.brightness;
+       writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
+
+       value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
+
+       if (bldev->props.state & BL_CORE_FBBLANK)
+               value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
+       else
+               value |= ADX_BACKLIGHT_CONTROL_ENABLE;
+
+       writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
+
+       return 0;
+}
+
+static int adx_backlight_get_brightness(struct backlight_device *bldev)
+{
+       struct adxbl *bl = bl_get_data(bldev);
+       u32 brightness;
+
+       brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
+       return brightness & 0xff;
+}
+
+static int adx_backlight_check_fb(struct fb_info *fb)
+{
+       return 1;
+}
+
+static struct backlight_ops adx_backlight_ops = {
+       .options = 0,
+       .update_status = adx_backlight_update_status,
+       .get_brightness = adx_backlight_get_brightness,
+       .check_fb = adx_backlight_check_fb,
+};
+
+static int __devinit adx_backlight_probe(struct platform_device *pdev)
+{
+       struct backlight_device *bldev;
+       struct resource *res;
+       struct adxbl *bl;
+       int ret = 0;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               ret = -ENXIO;
+               goto out;
+       }
+
+       res = devm_request_mem_region(&pdev->dev, res->start,
+                       resource_size(res), res->name);
+       if (!res) {
+               ret = -ENXIO;
+               goto out;
+       }
+
+       bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
+       if (!bl) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
+                       resource_size(res));
+       if (!bl->base) {
+               ret = -ENXIO;
+               goto out;
+       }
+
+       bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
+                       &adx_backlight_ops);
+       if (!bldev) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       bldev->props.max_brightness = 0xff;
+       bldev->props.brightness = 0xff;
+       bldev->props.power = FB_BLANK_UNBLANK;
+
+       platform_set_drvdata(pdev, bldev);
+
+out:
+       return ret;
+}
+
+static int __devexit adx_backlight_remove(struct platform_device *pdev)
+{
+       struct backlight_device *bldev;
+       int ret = 0;
+
+       bldev = platform_get_drvdata(pdev);
+       bldev->props.power = FB_BLANK_UNBLANK;
+       bldev->props.brightness = 0xff;
+       backlight_update_status(bldev);
+       backlight_device_unregister(bldev);
+       platform_set_drvdata(pdev, NULL);
+
+       return ret;
+}
+
+#ifdef CONFIG_PM
+static int adx_backlight_suspend(struct platform_device *pdev,
+               pm_message_t state)
+{
+       return 0;
+}
+
+static int adx_backlight_resume(struct platform_device *pdev)
+{
+       return 0;
+}
+#else
+#define adx_backlight_suspend NULL
+#define adx_backlight_resume NULL
+#endif
+
+static struct platform_driver adx_backlight_driver = {
+       .probe = adx_backlight_probe,
+       .remove = __devexit_p(adx_backlight_remove),
+       .suspend = adx_backlight_suspend,
+       .resume = adx_backlight_resume,
+       .driver = {
+               .name = "adx-backlight",
+               .owner = THIS_MODULE,
+       },
+};
+
+static int __init adx_backlight_init(void)
+{
+       return platform_driver_register(&adx_backlight_driver);
+}
+
+static void __exit adx_backlight_exit(void)
+{
+       platform_driver_unregister(&adx_backlight_driver);
+}
+
+module_init(adx_backlight_init);
+module_exit(adx_backlight_exit);
+
+MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
+MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
+MODULE_LICENSE("GPL v2");