diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-of.c | 87 | ||||
| -rw-r--r-- | include/media/v4l2-of.h | 17 |
2 files changed, 104 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c index 3ac634891f75..c52fb9620e11 100644 --- a/drivers/media/v4l2-core/v4l2-of.c +++ b/drivers/media/v4l2-core/v4l2-of.c @@ -14,6 +14,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/slab.h> #include <linux/string.h> #include <linux/types.h> @@ -141,6 +142,10 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node, * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. * The caller should hold a reference to @node. * + * NOTE: This function does not parse properties the size of which is + * variable without a low fixed limit. Please use + * v4l2_of_alloc_parse_endpoint() in new drivers instead. + * * Return: 0. */ int v4l2_of_parse_endpoint(const struct device_node *node, @@ -167,6 +172,88 @@ int v4l2_of_parse_endpoint(const struct device_node *node, } EXPORT_SYMBOL(v4l2_of_parse_endpoint); +/* + * v4l2_of_free_endpoint() - free the endpoint acquired by + * v4l2_of_alloc_parse_endpoint() + * @endpoint - the endpoint the resources of which are to be released + * + * It is safe to call this function with NULL argument or on an + * endpoint the parsing of which failed. + */ +void v4l2_of_free_endpoint(struct v4l2_of_endpoint *endpoint) +{ + if (IS_ERR_OR_NULL(endpoint)) + return; + + kfree(endpoint->link_frequencies); + kfree(endpoint); +} +EXPORT_SYMBOL(v4l2_of_free_endpoint); + +/** + * v4l2_of_alloc_parse_endpoint() - parse all endpoint node properties + * @node: pointer to endpoint device_node + * + * 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. + * + * v4l2_of_alloc_parse_endpoint() has two important differences to + * v4l2_of_parse_endpoint(): + * + * 1. It also parses variable size data and + * + * 2. The memory it has allocated to store the variable size data must + * be freed using v4l2_of_free_endpoint() when no longer needed. + * + * Return: Pointer to v4l2_of_endpoint if successful, on error a + * negative error code. + */ +struct v4l2_of_endpoint *v4l2_of_alloc_parse_endpoint( + const struct device_node *node) +{ + struct v4l2_of_endpoint *endpoint; + int len; + int rval; + + endpoint = kzalloc(sizeof(*endpoint), GFP_KERNEL); + if (!endpoint) + return ERR_PTR(-ENOMEM); + + rval = v4l2_of_parse_endpoint(node, endpoint); + if (rval < 0) + goto out_err; + + if (of_get_property(node, "link-frequencies", &len)) { + endpoint->link_frequencies = kmalloc(len, GFP_KERNEL); + if (!endpoint->link_frequencies) { + rval = -ENOMEM; + goto out_err; + } + + endpoint->nr_of_link_frequencies = + len / sizeof(*endpoint->link_frequencies); + + rval = of_property_read_u64_array( + node, "link-frequencies", endpoint->link_frequencies, + endpoint->nr_of_link_frequencies); + if (rval < 0) + goto out_err; + } + + return endpoint; + +out_err: + v4l2_of_free_endpoint(endpoint); + return ERR_PTR(rval); +} +EXPORT_SYMBOL(v4l2_of_alloc_parse_endpoint); + /** * v4l2_of_parse_link() - parse a link between two endpoints * @node: pointer to the endpoint at the local end of the link diff --git a/include/media/v4l2-of.h b/include/media/v4l2-of.h index 6c85c079544f..241e98aee40e 100644 --- a/include/media/v4l2-of.h +++ b/include/media/v4l2-of.h @@ -57,6 +57,8 @@ struct v4l2_of_bus_parallel { * @base: struct of_endpoint containing port, id, and local of_node * @bus_type: bus type * @bus: bus configuration data structure + * @link_frequencies: array of supported link frequencies + * @nr_of_link_frequencies: number of elements in link_frequenccies array */ struct v4l2_of_endpoint { struct of_endpoint base; @@ -66,6 +68,8 @@ struct v4l2_of_endpoint { struct v4l2_of_bus_parallel parallel; struct v4l2_of_bus_mipi_csi2 mipi_csi2; } bus; + u64 *link_frequencies; + unsigned int nr_of_link_frequencies; }; /** @@ -85,6 +89,9 @@ struct v4l2_of_link { #ifdef CONFIG_OF int v4l2_of_parse_endpoint(const struct device_node *node, struct v4l2_of_endpoint *endpoint); +struct v4l2_of_endpoint *v4l2_of_alloc_parse_endpoint( + const struct device_node *node); +void v4l2_of_free_endpoint(struct v4l2_of_endpoint *endpoint); int v4l2_of_parse_link(const struct device_node *node, struct v4l2_of_link *link); void v4l2_of_put_link(struct v4l2_of_link *link); @@ -96,6 +103,16 @@ static inline int v4l2_of_parse_endpoint(const struct device_node *node, return -ENOSYS; } +struct v4l2_of_endpoint *v4l2_of_alloc_parse_endpoint( + const struct device_node *node) +{ + return NULL; +} + +static void v4l2_of_free_endpoint(struct v4l2_of_endpoint *endpoint) +{ +} + static inline int v4l2_of_parse_link(const struct device_node *node, struct v4l2_of_link *link) { |