[PATCH 31/38] media: imx: Add video switch

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From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>

This driver can handle SoC internal and extern video bus multiplexers,
controlled either by register bit fields or by GPIO.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
 drivers/staging/media/imx/capture/Kconfig          |   9 +
 drivers/staging/media/imx/capture/Makefile         |   1 +
 .../staging/media/imx/capture/imx-video-switch.c   | 348 +++++++++++++++++++++
 3 files changed, 358 insertions(+)
 create mode 100644 drivers/staging/media/imx/capture/imx-video-switch.c

diff --git a/drivers/staging/media/imx/capture/Kconfig b/drivers/staging/media/imx/capture/Kconfig
index ac6fce0..ecd09abe 100644
--- a/drivers/staging/media/imx/capture/Kconfig
+++ b/drivers/staging/media/imx/capture/Kconfig
@@ -8,4 +8,13 @@ config IMX_MIPI_CSI2
          MIPI CSI-2 Receiver driver support. This driver is required
 	 for sensor drivers with a MIPI CSI2 interface.
 
+config IMX_VIDEO_SWITCH
+	tristate "i.MX5/6 Video Bus Multiplexer"
+	depends on VIDEO_IMX_CAMERA
+	default y
+	---help---
+	  This driver provides support for the i.MX5/6 internal video bus
+	  multiplexer controlled by register bitfields as well as
+	  external multiplexers controller by a GPIO.
+
 endmenu
diff --git a/drivers/staging/media/imx/capture/Makefile b/drivers/staging/media/imx/capture/Makefile
index 8961a4f..f17b199 100644
--- a/drivers/staging/media/imx/capture/Makefile
+++ b/drivers/staging/media/imx/capture/Makefile
@@ -4,3 +4,4 @@ imx-camera-objs := imx-camif.o imx-ic-prpenc.o imx-of.o \
 obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-camera.o
 obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-csi.o
 obj-$(CONFIG_IMX_MIPI_CSI2) += mipi-csi2.o
+obj-$(CONFIG_IMX_VIDEO_SWITCH) += imx-video-switch.o
diff --git a/drivers/staging/media/imx/capture/imx-video-switch.c b/drivers/staging/media/imx/capture/imx-video-switch.c
new file mode 100644
index 0000000..0c86679
--- /dev/null
+++ b/drivers/staging/media/imx/capture/imx-video-switch.c
@@ -0,0 +1,348 @@
+/*
+ * devicetree probed mediacontrol video multiplexer.
+ *
+ * Copyright (C) 2013 Sascha Hauer, Pengutronix
+ * Copyright (c) 2014-2016 Mentor Graphics Inc.
+ *
+ * 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 <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/of_graph.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-of.h>
+
+struct vidsw {
+	struct device *dev;
+	struct v4l2_subdev subdev;
+#ifdef CONFIG_MEDIA_CONTROLLER
+	struct media_pad *pads;
+#endif
+	struct v4l2_mbus_framefmt *format_mbus;
+	struct v4l2_of_endpoint *endpoint;
+	struct regmap_field *field;
+	unsigned int gpio;
+	int output_pad;
+	int numpads;
+	int active;
+};
+
+#define to_vidsw(sd) container_of(sd, struct vidsw, subdev)
+
+static int vidsw_set_mux(struct vidsw *vidsw, int input_index)
+{
+	if (vidsw->active >= 0) {
+		if (vidsw->active == input_index)
+			return 0;
+		else
+			return -EBUSY;
+	}
+
+	vidsw->active = input_index;
+
+	dev_dbg(vidsw->dev, "setting %d active\n", vidsw->active);
+
+	if (vidsw->field)
+		regmap_field_write(vidsw->field, vidsw->active);
+	else if (gpio_is_valid(vidsw->gpio))
+		gpio_set_value(vidsw->gpio, vidsw->active);
+
+	return 0;
+}
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+static int vidsw_link_setup(struct media_entity *entity,
+		const struct media_pad *local,
+		const struct media_pad *remote, u32 flags)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct vidsw *vidsw = to_vidsw(sd);
+
+	dev_dbg(vidsw->dev, "link setup %s -> %s", remote->entity->name,
+		local->entity->name);
+
+	if (!(flags & MEDIA_LNK_FL_ENABLED)) {
+		if (local->index == vidsw->active) {
+			dev_dbg(vidsw->dev, "going inactive\n");
+			vidsw->active = -1;
+		}
+		return 0;
+	}
+
+	return vidsw_set_mux(vidsw, local->index);
+}
+
+static struct media_entity_operations vidsw_ops = {
+	.link_setup = vidsw_link_setup,
+};
+#endif
+
+static int vidsw_s_routing(struct v4l2_subdev *sd, u32 input,
+			   u32 output, u32 config)
+{
+	struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+	return vidsw_set_mux(vidsw, input);
+}
+
+static int vidsw_async_init(struct vidsw *vidsw, struct device_node *node)
+{
+	struct v4l2_of_endpoint endpoint;
+	struct device_node *epnode;
+	int pad, numpads;
+#ifdef CONFIG_MEDIA_CONTROLLER
+	int ret;
+#endif
+
+	numpads = of_get_child_count(node);
+	if (numpads < 2) {
+		dev_err(vidsw->dev, "Not enough ports %d\n", numpads);
+		return -EINVAL;
+	}
+
+	vidsw->numpads = numpads;
+
+	/*
+	 * the last endpoint must define the mux output pad,
+	 * the rest are the mux input pads.
+	 */
+	vidsw->output_pad = numpads - 1;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+	vidsw->pads = devm_kzalloc(vidsw->dev,
+				   numpads * sizeof(*vidsw->pads),
+				   GFP_KERNEL);
+	if (!vidsw->pads)
+		return -ENOMEM;
+#endif
+
+	vidsw->endpoint = devm_kzalloc(vidsw->dev,
+				       numpads * sizeof(*vidsw->endpoint),
+				       GFP_KERNEL);
+	if (!vidsw->endpoint)
+		return -ENOMEM;
+
+	vidsw->format_mbus = devm_kzalloc(vidsw->dev,
+					  numpads * sizeof(*vidsw->format_mbus),
+					  GFP_KERNEL);
+	if (!vidsw->format_mbus)
+		return -ENOMEM;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+	vidsw->subdev.entity.ops = &vidsw_ops;
+
+	/* init the pad directions */
+	for (pad = 0; pad < vidsw->output_pad; pad++)
+		vidsw->pads[pad].flags = MEDIA_PAD_FL_SINK;
+	vidsw->pads[vidsw->output_pad].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&vidsw->subdev.entity,
+				     vidsw->numpads, vidsw->pads);
+	if (ret < 0)
+		return ret;
+#endif
+
+	epnode = NULL;
+	for (pad = 0; pad < vidsw->numpads; pad++) {
+		epnode = of_graph_get_next_endpoint(node, epnode);
+		if (!epnode)
+			return -EINVAL;
+
+		v4l2_of_parse_endpoint(epnode, &endpoint);
+		vidsw->endpoint[pad] = endpoint;
+		of_node_put(epnode);
+	}
+
+	return 0;
+}
+
+static int vidsw_registered(struct v4l2_subdev *sd)
+{
+	return 0;
+}
+
+int vidsw_g_mbus_config(struct v4l2_subdev *sd, struct v4l2_mbus_config *cfg)
+{
+	struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+	dev_dbg(vidsw->dev, "reporting configration %d\n", vidsw->active);
+
+	/* Mirror the input side on the output side */
+	cfg->type = vidsw->endpoint[vidsw->active].bus_type;
+	if (cfg->type == V4L2_MBUS_PARALLEL || cfg->type == V4L2_MBUS_BT656)
+		cfg->flags = vidsw->endpoint[vidsw->active].bus.parallel.flags;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops vidsw_subdev_video_ops = {
+	.g_mbus_config = vidsw_g_mbus_config,
+	.s_routing = vidsw_s_routing,
+};
+
+static int vidsw_get_format(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_pad_config *cfg,
+			    struct v4l2_subdev_format *sdformat)
+{
+	struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+	sdformat->format = vidsw->format_mbus[sdformat->pad];
+
+	return 0;
+}
+
+static int vidsw_set_format(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_pad_config *cfg,
+			    struct v4l2_subdev_format *sdformat)
+{
+	struct vidsw *vidsw = container_of(sd, struct vidsw, subdev);
+
+	if (sdformat->pad >= vidsw->numpads)
+		return -EINVAL;
+
+	/* Output pad mirrors active input pad, no limitations on input pads */
+	if (sdformat->pad == vidsw->output_pad && vidsw->active >= 0)
+		sdformat->format = vidsw->format_mbus[vidsw->active];
+
+	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
+		cfg->try_fmt = sdformat->format;
+	else
+		vidsw->format_mbus[sdformat->pad] = sdformat->format;
+
+	return 0;
+}
+
+static struct v4l2_subdev_pad_ops vidsw_pad_ops = {
+	.get_fmt = vidsw_get_format,
+	.set_fmt = vidsw_set_format,
+};
+
+static struct v4l2_subdev_ops vidsw_subdev_ops = {
+	.pad = &vidsw_pad_ops,
+	.video = &vidsw_subdev_video_ops,
+};
+
+static struct v4l2_subdev_internal_ops vidsw_internal_ops = {
+	.registered = vidsw_registered,
+};
+
+static int of_get_reg_field(struct device_node *node, struct reg_field *field)
+{
+	u32 reg_bit_mask[2];
+	int ret;
+
+	ret = of_property_read_u32_array(node, "reg", reg_bit_mask, 2);
+	if (ret < 0)
+		return ret;
+
+	field->reg = reg_bit_mask[0];
+	field->lsb = __ffs(reg_bit_mask[1]);
+	field->msb = __fls(reg_bit_mask[1]);
+
+	return 0;
+}
+
+static int vidsw_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct reg_field field;
+	struct vidsw *vidsw;
+	struct regmap *map;
+	int ret;
+
+	vidsw = devm_kzalloc(&pdev->dev, sizeof(*vidsw), GFP_KERNEL);
+	if (!vidsw)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, vidsw);
+
+	v4l2_subdev_init(&vidsw->subdev, &vidsw_subdev_ops);
+	v4l2_set_subdevdata(&vidsw->subdev, &pdev->dev);
+	vidsw->subdev.internal_ops = &vidsw_internal_ops;
+	snprintf(vidsw->subdev.name, sizeof(vidsw->subdev.name), "%s",
+			np->name);
+	vidsw->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	vidsw->subdev.dev = &pdev->dev;
+	vidsw->dev = &pdev->dev;
+	vidsw->active = -1;
+
+	ret = of_get_reg_field(np, &field);
+	if (ret == 0) {
+		map = syscon_regmap_lookup_by_phandle(np, "gpr");
+		if (!map) {
+			dev_err(&pdev->dev,
+				"Failed to get syscon register map\n");
+			return PTR_ERR(map);
+		}
+
+		vidsw->field = devm_regmap_field_alloc(&pdev->dev, map, field);
+		if (IS_ERR(vidsw->field)) {
+			dev_err(&pdev->dev,
+				"Failed to allocate regmap field\n");
+			return PTR_ERR(vidsw->field);
+		}
+	} else {
+		vidsw->gpio = of_get_named_gpio_flags(np, "gpios", 0, NULL);
+		ret = gpio_request_one(vidsw->gpio,
+				       GPIOF_OUT_INIT_LOW, np->name);
+		if (ret < 0) {
+			dev_warn(&pdev->dev,
+				 "could not request control gpio %d: %d\n",
+				 vidsw->gpio, ret);
+			vidsw->gpio = -1;
+		}
+	}
+
+	ret = vidsw_async_init(vidsw, np);
+	if (ret)
+		return ret;
+
+	ret = v4l2_async_register_subdev(&vidsw->subdev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int vidsw_remove(struct platform_device *pdev)
+{
+	/* FIXME */
+
+	return -EBUSY;
+}
+
+static const struct of_device_id vidsw_dt_ids[] = {
+	{ .compatible = "imx-video-mux", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, vidsw_dt_ids);
+
+static struct platform_driver vidsw_driver = {
+	.probe		= vidsw_probe,
+	.remove		= vidsw_remove,
+	.driver		= {
+		.of_match_table = vidsw_dt_ids,
+		.name	= "imx-video-mux",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(vidsw_driver);
+
+MODULE_DESCRIPTION("i.MX video stream multiplexer");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
-- 
1.9.1

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