1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/video/fbdev/mxc/hannstar_cabc.c b/drivers/video/fbdev/mxc/hannstar_cabc.c
new file mode 100644
index 000000000000..14528c8c6511
--- /dev/null
+++ b/drivers/video/fbdev/mxc/hannstar_cabc.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2014-2015 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+
+#define DRIVER_NAME "hannstar-cabc"
+
+static const struct of_device_id cabc_dt_ids[] = {
+	{ .compatible = "hannstar,cabc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cabc_dt_ids);
+
+static int cabc_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node, *pp;
+	int cabc_gpio, ret = 0;
+	bool cabc_enable;
+	unsigned long gpio_flag;
+	enum of_gpio_flags flags;
+
+	for_each_child_of_node(np, pp) {
+		if (!of_find_property(pp, "gpios", NULL)) {
+			dev_warn(&pdev->dev, "Found interface without "
+				 "gpios\n");
+			continue;
+		}
+
+		cabc_gpio = of_get_gpio_flags(pp, 0, &flags);
+		if (!gpio_is_valid(cabc_gpio)) {
+			ret = cabc_gpio;
+			if (ret != -EPROBE_DEFER)
+				dev_err(&pdev->dev,
+					"Failed to get gpio flags, "
+					"error: %d\n", ret);
+			return ret;
+		}
+
+		cabc_enable = of_property_read_bool(pp, "cabc-enable");
+
+		if (flags & OF_GPIO_ACTIVE_LOW)
+			gpio_flag = cabc_enable ?
+				GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
+		else
+			gpio_flag = cabc_enable ?
+				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+
+		devm_gpio_request_one(&pdev->dev, cabc_gpio,
+					gpio_flag, "hannstar-cabc");
+	}
+
+	return ret;
+}
+
+static struct platform_driver cabc_driver = {
+	.probe	= cabc_probe,
+	.driver = {
+		.of_match_table = cabc_dt_ids,
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+	},
+};
+module_platform_driver(cabc_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Hannstar CABC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);