video: Add simple-panel support

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 167 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6637877798..af9e14b30a 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -117,4 +117,10 @@ config DRIVER_VIDEO_MTL017
 	  The MTL017 is a parallel to lvds video encoder chip found on the
 	  Efika MX Smartbook.
 
+config DRIVER_VIDEO_SIMPLE_PANEL
+	bool "Simple panel support"
+	select VIDEO_VPL
+	help
+	  This enabled support for simple panels, i.e. panels which consits of
+	  a mode definition and enable gpios in the devicetree.
 endif
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 1e2109e172..eab6461cff 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT) += backlight.o
 obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT_PWM) += backlight-pwm.o
 obj-$(CONFIG_VIDEO_VPL) += vpl.o
 obj-$(CONFIG_DRIVER_VIDEO_MTL017) += mtl017.o
+obj-$(CONFIG_DRIVER_VIDEO_SIMPLE_PANEL) += simple-panel.o
 
 obj-$(CONFIG_DRIVER_VIDEO_ATMEL) += atmel_lcdfb.o atmel_lcdfb_core.o
 obj-$(CONFIG_DRIVER_VIDEO_ATMEL_HLCD) += atmel_hlcdfb.o atmel_lcdfb_core.o
diff --git a/drivers/video/simple-panel.c b/drivers/video/simple-panel.c
new file mode 100644
index 0000000000..dceedc60c3
--- /dev/null
+++ b/drivers/video/simple-panel.c
@@ -0,0 +1,160 @@
+/*
+ * simple panel support for barebox
+ *
+ * (C) Copyright 2014 Sascha Hauer, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <malloc.h>
+#include <init.h>
+#include <linux/err.h>
+#include <of.h>
+#include <fb.h>
+#include <gpio.h>
+#include <of_gpio.h>
+#include <video/backlight.h>
+#include <video/vpl.h>
+#include <i2c/i2c.h>
+
+struct simple_panel {
+	struct vpl vpl;
+	int enable_gpio;
+	int enable_active_high;
+	int enabled;
+	struct device_node *backlight_node;
+	struct backlight_device *backlight;
+	struct device_node *ddc_node;
+	int enable_delay;
+};
+
+static int simple_panel_enable(struct simple_panel *panel)
+{
+	int ret;
+
+	if (panel->backlight_node && !panel->backlight) {
+		panel->backlight = of_backlight_find(panel->backlight_node);
+		if (!panel->backlight)
+			return -ENODEV;
+	}
+
+	if (gpio_is_valid(panel->enable_gpio))
+		gpio_direction_output(panel->enable_gpio,
+			panel->enable_active_high);
+
+	if (panel->enable_delay)
+		mdelay(panel->enable_delay);
+
+	if (panel->backlight) {
+		ret = backlight_set_brightness_default(panel->backlight);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int simple_panel_disable(struct simple_panel *panel)
+{
+	if (panel->backlight)
+		backlight_set_brightness(panel->backlight, 0);
+
+	if (gpio_is_valid(panel->enable_gpio))
+		gpio_direction_output(panel->enable_gpio,
+			!panel->enable_active_high);
+
+	return 0;
+}
+
+static int simple_panel_get_modes(struct simple_panel *panel, struct display_timings *timings)
+{
+	int ret = -ENOENT;
+
+	if (panel->ddc_node) {
+		struct i2c_adapter *i2c;
+
+                i2c = of_find_i2c_adapter_by_node(panel->ddc_node);
+		if (!i2c)
+			return -ENODEV;
+		timings->edid = edid_read_i2c(i2c);
+		if (!timings->edid)
+			return -EINVAL;
+
+		ret = edid_to_display_timings(timings, timings->edid);
+	}
+
+	return ret;
+}
+
+static int simple_panel_ioctl(struct vpl *vpl, unsigned int port,
+			unsigned int cmd, void *ptr)
+{
+	struct simple_panel *panel = container_of(vpl,
+			struct simple_panel, vpl);
+
+	switch (cmd) {
+	case VPL_ENABLE:
+		return simple_panel_enable(panel);
+	case VPL_DISABLE:
+		return simple_panel_disable(panel);
+	case VPL_GET_VIDEOMODES:
+		return simple_panel_get_modes(panel, ptr);
+	default:
+		return -ENOSYS;
+	}
+}
+
+static int simple_panel_probe(struct device_d *dev)
+{
+	struct simple_panel *panel;
+	struct device_node *node = dev->device_node;
+	enum of_gpio_flags flags;
+	int ret;
+
+	panel = xzalloc(sizeof(*panel));
+
+	panel->enable_gpio = of_get_named_gpio_flags(node, "enable-gpios", 0, &flags);
+	panel->vpl.node = node;
+	panel->vpl.ioctl = simple_panel_ioctl;
+
+	if (gpio_is_valid(panel->enable_gpio)) {
+		if (!(flags & OF_GPIO_ACTIVE_LOW))
+			panel->enable_active_high = 1;
+	}
+
+	panel->ddc_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
+
+	of_property_read_u32(node, "enable-delay", &panel->enable_delay);
+
+	panel->backlight_node = of_parse_phandle(node, "backlight", 0);
+
+	ret = vpl_register(&panel->vpl);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct of_device_id simple_panel_of_ids[] = {
+	{ .compatible = "simple-panel", },
+	{ }
+};
+
+static struct driver_d simple_panel_driver = {
+	.name  = "simple-panel",
+	.probe = simple_panel_probe,
+	.of_compatible = DRV_OF_COMPAT(simple_panel_of_ids),
+};
+device_platform_driver(simple_panel_driver);