[media] Add a V4L2 OF parser

ifeq ($(CONFIG_COMPAT),y)

  videodev-objs += v4l2-compat-ioctl32.o

endif

ifeq ($(CONFIG_OF),y)

  videodev-objs += v4l2-of.o

endif

obj-$(CONFIG_VIDEO_DEV) += videodev.o

obj-$(CONFIG_VIDEO_V4L2_INT_DEVICE) += v4l2-int-device.o

/*

 * V4L2 OF binding parsing library

 *

 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.

 * Sylwester Nawrocki <s.nawrocki@samsung.com>

 *

 * Copyright (C) 2012 Renesas Electronics Corp.

 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/string.h>

#include <linux/types.h>

#include <media/v4l2-of.h>

static void v4l2_of_parse_csi_bus(const struct device_node *node,

				  struct v4l2_of_endpoint *endpoint)

{

	struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;

	u32 data_lanes[ARRAY_SIZE(bus->data_lanes)];

	struct property *prop;

	bool have_clk_lane = false;

	unsigned int flags = 0;

	u32 v;

	prop = of_find_property(node, "data-lanes", NULL);

	if (prop) {

		const __be32 *lane = NULL;

		int i;

		for (i = 0; i < ARRAY_SIZE(data_lanes); i++) {

			lane = of_prop_next_u32(prop, lane, &data_lanes[i]);

			if (!lane)

				break;

		}

		bus->num_data_lanes = i;

		while (i--)

			bus->data_lanes[i] = data_lanes[i];

	}

	if (!of_property_read_u32(node, "clock-lanes", &v)) {

		bus->clock_lane = v;

		have_clk_lane = true;

	}

	if (of_get_property(node, "clock-noncontinuous", &v))

		flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;

	else if (have_clk_lane || bus->num_data_lanes > 0)

		flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;

	bus->flags = flags;

	endpoint->bus_type = V4L2_MBUS_CSI2;

}

static void v4l2_of_parse_parallel_bus(const struct device_node *node,

				       struct v4l2_of_endpoint *endpoint)

{

	struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel;

	unsigned int flags = 0;

	u32 v;

	if (!of_property_read_u32(node, "hsync-active", &v))

		flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH :

			V4L2_MBUS_HSYNC_ACTIVE_LOW;

	if (!of_property_read_u32(node, "vsync-active", &v))

		flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :

			V4L2_MBUS_VSYNC_ACTIVE_LOW;

	if (!of_property_read_u32(node, "pclk-sample", &v))

		flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :

			V4L2_MBUS_PCLK_SAMPLE_FALLING;

	if (!of_property_read_u32(node, "field-even-active", &v))

		flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :

			V4L2_MBUS_FIELD_EVEN_LOW;

	if (flags)

		endpoint->bus_type = V4L2_MBUS_PARALLEL;

	else

		endpoint->bus_type = V4L2_MBUS_BT656;

	if (!of_property_read_u32(node, "data-active", &v))

		flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :

			V4L2_MBUS_DATA_ACTIVE_LOW;

	if (of_get_property(node, "slave-mode", &v))

		flags |= V4L2_MBUS_SLAVE;

	else

		flags |= V4L2_MBUS_MASTER;

	if (!of_property_read_u32(node, "bus-width", &v))

		bus->bus_width = v;

	if (!of_property_read_u32(node, "data-shift", &v))

		bus->data_shift = v;

	bus->flags = flags;

}

EXPORT_SYMBOL(v4l2_of_parse_parallel_bus);

/**

 * v4l2_of_parse_endpoint() - parse all endpoint node properties

 * @node: pointer to endpoint device_node

 * @endpoint: pointer to the V4L2 OF endpoint data structure

 *

 * All properties are optional. If none are found, we don't set any flags.

 * This means the port has a static configuration and no properties have

 * to be specified explicitly.

 * If any properties that identify the bus as parallel are found and

 * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise

 * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the

 * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.

 * The caller should hold a reference to @node.

 */

void v4l2_of_parse_endpoint(const struct device_node *node,

			    struct v4l2_of_endpoint *endpoint)

{

	struct device_node *port_node = of_get_parent(node);

	memset(endpoint, 0, offsetof(struct v4l2_of_endpoint, head));

	endpoint->local_node = node;

	/*

	 * It doesn't matter whether the two calls below succeed.

	 * If they don't then the default value 0 is used.

	 */

	of_property_read_u32(port_node, "reg", &endpoint->port);

	of_property_read_u32(node, "reg", &endpoint->id);

	v4l2_of_parse_csi_bus(node, endpoint);

	/*

	 * Parse the parallel video bus properties only if none

	 * of the MIPI CSI-2 specific properties were found.

	 */

	if (endpoint->bus.mipi_csi2.flags == 0)

		v4l2_of_parse_parallel_bus(node, endpoint);

	of_node_put(port_node);

}

EXPORT_SYMBOL(v4l2_of_parse_endpoint);

/**

 * v4l2_of_get_next_endpoint() - get next endpoint node

 * @parent: pointer to the parent device node

 * @prev: previous endpoint node, or NULL to get first

 *

 * Return: An 'endpoint' node pointer with refcount incremented. Refcount

 * of the passed @prev node is not decremented, the caller have to use

 * of_node_put() on it when done.

 */

struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,

					struct device_node *prev)

{

	struct device_node *endpoint;

	struct device_node *port = NULL;

	if (!parent)

		return NULL;

	if (!prev) {

		struct device_node *node;

		/*

		 * It's the first call, we have to find a port subnode

		 * within this node or within an optional 'ports' node.

		 */

		node = of_get_child_by_name(parent, "ports");

		if (node)

			parent = node;

		for_each_child_of_node(parent, node) {

			if (!of_node_cmp(node->name, "port")) {

				port = node;

				break;

			}

		}

		if (port) {

			/* Found a port, get an endpoint. */

			endpoint = of_get_next_child(port, NULL);

			of_node_put(port);

		} else {

			endpoint = NULL;

		}

		if (!endpoint)

			pr_err("%s(): no endpoint nodes specified for %s\n",

			       __func__, parent->full_name);

	} else {

		port = of_get_parent(prev);

		if (!port)

			/* Hm, has someone given us the root node ?... */

			return NULL;

		/* Avoid dropping prev node refcount to 0. */

		of_node_get(prev);

		endpoint = of_get_next_child(port, prev);

		if (endpoint) {

			of_node_put(port);

			return endpoint;

		}

		/* No more endpoints under this port, try the next one. */

		do {

			port = of_get_next_child(parent, port);

			if (!port)

				return NULL;

		} while (of_node_cmp(port->name, "port"));

		/* Pick up the first endpoint in this port. */

		endpoint = of_get_next_child(port, NULL);

		of_node_put(port);

	}

	return endpoint;

}

EXPORT_SYMBOL(v4l2_of_get_next_endpoint);

/**

 * v4l2_of_get_remote_port_parent() - get remote port's parent node

 * @node: pointer to a local endpoint device_node

 *

 * Return: Remote device node associated with remote endpoint node linked

 *	   to @node. Use of_node_put() on it when done.

 */

struct device_node *v4l2_of_get_remote_port_parent(

			       const struct device_node *node)

{

	struct device_node *np;

	unsigned int depth;

	/* Get remote endpoint node. */

	np = of_parse_phandle(node, "remote-endpoint", 0);

	/* Walk 3 levels up only if there is 'ports' node. */

	for (depth = 3; depth && np; depth--) {

		np = of_get_next_parent(np);

		if (depth == 2 && of_node_cmp(np->name, "ports"))

			break;

	}

	return np;

}

EXPORT_SYMBOL(v4l2_of_get_remote_port_parent);

/**

 * v4l2_of_get_remote_port() - get remote port node

 * @node: pointer to a local endpoint device_node

 *

 * Return: Remote port node associated with remote endpoint node linked

 *	   to @node. Use of_node_put() on it when done.

 */

struct device_node *v4l2_of_get_remote_port(const struct device_node *node)

{

	struct device_node *np;

	/* Get remote endpoint node. */

	np = of_parse_phandle(node, "remote-endpoint", 0);

	if (!np)

		return NULL;

	return of_get_parent(np);

}

EXPORT_SYMBOL(v4l2_of_get_remote_port);

/*

 * V4L2 OF binding parsing library

 *

 * Copyright (C) 2012 Renesas Electronics Corp.

 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

 *

 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.

 * Sylwester Nawrocki <s.nawrocki@samsung.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 */

#ifndef _V4L2_OF_H

#define _V4L2_OF_H

#include <linux/list.h>

#include <linux/types.h>

#include <linux/errno.h>

#include <media/v4l2-mediabus.h>

struct device_node;

/**

 * struct v4l2_of_bus_mipi_csi2 - MIPI CSI-2 bus data structure

 * @flags: media bus (V4L2_MBUS_*) flags

 * @data_lanes: an array of physical data lane indexes

 * @clock_lane: physical lane index of the clock lane

 * @num_data_lanes: number of data lanes

 */

struct v4l2_of_bus_mipi_csi2 {

	unsigned int flags;

	unsigned char data_lanes[4];

	unsigned char clock_lane;

	unsigned short num_data_lanes;

};

/**

 * struct v4l2_of_bus_parallel - parallel data bus data structure

 * @flags: media bus (V4L2_MBUS_*) flags

 * @bus_width: bus width in bits

 * @data_shift: data shift in bits

 */

struct v4l2_of_bus_parallel {

	unsigned int flags;

	unsigned char bus_width;

	unsigned char data_shift;

};

/**

 * struct v4l2_of_endpoint - the endpoint data structure

 * @port: identifier (value of reg property) of a port this endpoint belongs to

 * @id: identifier (value of reg property) of this endpoint

 * @local_node: pointer to device_node of this endpoint

 * @remote: phandle to remote endpoint node

 * @bus_type: bus type

 * @bus: bus configuration data structure

 * @head: list head for this structure

 */

struct v4l2_of_endpoint {

	unsigned int port;

	unsigned int id;

	const struct device_node *local_node;

	const __be32 *remote;

	enum v4l2_mbus_type bus_type;

	union {

		struct v4l2_of_bus_parallel parallel;

		struct v4l2_of_bus_mipi_csi2 mipi_csi2;

	} bus;

	struct list_head head;

};

#ifdef CONFIG_OF

void v4l2_of_parse_endpoint(const struct device_node *node,

				struct v4l2_of_endpoint *link);

struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,

					struct device_node *previous);

struct device_node *v4l2_of_get_remote_port_parent(

					const struct device_node *node);

struct device_node *v4l2_of_get_remote_port(const struct device_node *node);

#else /* CONFIG_OF */

static inline int v4l2_of_parse_endpoint(const struct device_node *node,

					struct v4l2_of_endpoint *link)

{

	return -ENOSYS;

}

static inline struct device_node *v4l2_of_get_next_endpoint(

					const struct device_node *parent,

					struct device_node *previous)

{

	return NULL;

}

static inline struct device_node *v4l2_of_get_remote_port_parent(

					const struct device_node *node)

{

	return NULL;

}

static inline struct device_node *v4l2_of_get_remote_port(

					const struct device_node *node)

{

	return NULL;

}

#endif /* CONFIG_OF */

#endif /* _V4L2_OF_H */