diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-fwnode.c | 167 | ||||
| -rw-r--r-- | include/media/v4l2-fwnode.h | 82 |
2 files changed, 249 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c index 78c32aebbe035..28ce9cfe6a72f 100644 --- a/drivers/media/v4l2-core/v4l2-fwnode.c +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -598,6 +598,173 @@ void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link) } EXPORT_SYMBOL_GPL(v4l2_fwnode_put_link); +static const struct v4l2_fwnode_connector_conv { + enum v4l2_connector_type type; + const char *compatible; +} connectors[] = { + { + .type = V4L2_CONN_COMPOSITE, + .compatible = "composite-video-connector", + }, { + .type = V4L2_CONN_SVIDEO, + .compatible = "svideo-connector", + }, +}; + +static enum v4l2_connector_type +v4l2_fwnode_string_to_connector_type(const char *con_str) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(connectors); i++) + if (!strcmp(con_str, connectors[i].compatible)) + return connectors[i].type; + + return V4L2_CONN_UNKNOWN; +} + +static void +v4l2_fwnode_connector_parse_analog(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *vc) +{ + u32 stds; + int ret; + + ret = fwnode_property_read_u32(fwnode, "sdtv-standards", &stds); + + /* The property is optional. */ + vc->connector.analog.sdtv_stds = ret ? V4L2_STD_ALL : stds; +} + +void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector) +{ + struct v4l2_connector_link *link, *tmp; + + if (IS_ERR_OR_NULL(connector) || + connector->type == V4L2_CONN_UNKNOWN) + return; + + list_for_each_entry_safe(link, tmp, &connector->links, head) { + v4l2_fwnode_put_link(&link->fwnode_link); + list_del(&link->head); + kfree(link); + } + + kfree(connector->label); + connector->label = NULL; + connector = NULL; +} +EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_free); + +static enum v4l2_connector_type +v4l2_fwnode_get_connector_type(struct fwnode_handle *fwnode) +{ + enum v4l2_connector_type connector_type; + const char *type_name; + int err; + + if (!fwnode) + return V4L2_CONN_UNKNOWN; + + /* The connector-type is stored within the compatible string. */ + err = fwnode_property_read_string(fwnode, "compatible", &type_name); + if (err) + return V4L2_CONN_UNKNOWN; + + connector_type = v4l2_fwnode_string_to_connector_type(type_name); + + return connector_type; +} + +int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector) +{ + struct fwnode_handle *connector_node; + enum v4l2_connector_type connector_type; + const char *label; + int err; + + if (!fwnode) + return -EINVAL; + + memset(connector, 0, sizeof(*connector)); + + INIT_LIST_HEAD(&connector->links); + + connector_node = fwnode_graph_get_port_parent(fwnode); + connector_type = v4l2_fwnode_get_connector_type(connector_node); + if (connector_type == V4L2_CONN_UNKNOWN) { + fwnode_handle_put(connector_node); + connector_node = fwnode_graph_get_remote_port_parent(fwnode); + connector_type = v4l2_fwnode_get_connector_type(connector_node); + } + + if (connector_type == V4L2_CONN_UNKNOWN) { + pr_err("Unknown connector type\n"); + err = -ENOTCONN; + goto out; + } + + connector->type = connector_type; + connector->name = fwnode_get_name(connector_node); + err = fwnode_property_read_string(connector_node, "label", &label); + connector->label = err ? NULL : kstrdup_const(label, GFP_KERNEL); + + /* Parse the connector specific properties. */ + switch (connector->type) { + case V4L2_CONN_COMPOSITE: + case V4L2_CONN_SVIDEO: + v4l2_fwnode_connector_parse_analog(connector_node, connector); + break; + /* Avoid compiler warnings */ + case V4L2_CONN_UNKNOWN: + ; + } + +out: + fwnode_handle_put(connector_node); + + return err; +} +EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_parse); + +int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector) +{ + struct fwnode_handle *connector_ep; + struct v4l2_connector_link *link; + int err; + + if (!fwnode || !connector || connector->type == V4L2_CONN_UNKNOWN) + return -EINVAL; + + link = kzalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + + connector_ep = fwnode_graph_get_remote_endpoint(fwnode); + if (!connector_ep) + return -ENOTCONN; + + err = v4l2_fwnode_parse_link(connector_ep, &link->fwnode_link); + if (err) + goto err; + + fwnode_handle_put(connector_ep); + + list_add(&link->head, &connector->links); + connector->nr_of_links++; + + return 0; + +err: + kfree(link); + fwnode_handle_put(connector_ep); + + return err; +} +EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_add_link); + static int v4l2_async_notifier_fwnode_parse_endpoint(struct device *dev, struct v4l2_async_notifier *notifier, diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h index 6cf39d447b107..2804e58b74476 100644 --- a/include/media/v4l2-fwnode.h +++ b/include/media/v4l2-fwnode.h @@ -295,6 +295,66 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode, void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link); /** + * v4l2_fwnode_connector_free() - free the V4L2 connector acquired memory + * @connector: the V4L2 connector resources of which are to be released + * + * Free all allocated memory and put all links aquired by + * v4l2_fwnode_connector_parse() and v4l2_fwnode_connector_add_link(). + * + * It is safe to call this function with NULL argument or on a V4L2 connector + * the parsing of which failed. + */ +void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector); + +/** + * v4l2_fwnode_connector_parse() - initialize the 'struct v4l2_fwnode_connector' + * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector + * is connected to or to the connector endpoint fwnode handle. + * @connector: pointer to the V4L2 fwnode connector data structure + * + * Fill the &struct v4l2_fwnode_connector with the connector type, label and + * all &enum v4l2_connector_type specific connector data. The label is optional + * so it is set to %NULL if no one was found. The function intialize the links + * to zero. Adding links to the connector is done by calling + * v4l2_fwnode_connector_add_link(). + * + * The memory allocated for the label must be freed when no longer needed. + * Freeing the memory is done by v4l2_fwnode_connector_free(). + * + * Return: + * * %0 on success or a negative error code on failure: + * * %-EINVAL if @fwnode is invalid + * * %-ENOTCONN if connector type is unknown or connector device can't be found + */ +int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector); + +/** + * v4l2_fwnode_connector_add_link - add a link between a connector node and + * a v4l2-subdev node. + * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector + * is connected to + * @connector: pointer to the V4L2 fwnode connector data structure + * + * Add a new &struct v4l2_connector_link link to the + * &struct v4l2_fwnode_connector connector links list. The link local_node + * points to the connector node, the remote_node to the host v4l2 (sub)dev. + * + * The taken references to remote_node and local_node must be dropped and the + * allocated memory must be freed when no longer needed. Both is done by calling + * v4l2_fwnode_connector_free(). + * + * Return: + * * %0 on success or a negative error code on failure: + * * %-EINVAL if @fwnode or @connector is invalid or @connector type is unknown + * * %-ENOMEM on link memory allocation failure + * * %-ENOTCONN if remote connector device can't be found + * * %-ENOLINK if link parsing between v4l2 (sub)dev and connector fails + */ +int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode, + struct v4l2_fwnode_connector *connector); + +/** * typedef parse_endpoint_func - Driver's callback function to be called on * each V4L2 fwnode endpoint. * @@ -467,4 +527,26 @@ v4l2_async_register_fwnode_subdev(struct v4l2_subdev *sd, unsigned int num_ports, parse_endpoint_func parse_endpoint); +/* Helper macros to access the connector links. */ + +/** v4l2_connector_last_link - Helper macro to get the first + * &struct v4l2_fwnode_connector link + * @v4l2c: &struct v4l2_fwnode_connector owning the connector links + * + * This marco returns the first added &struct v4l2_connector_link connector + * link or @NULL if the connector has no links. + */ +#define v4l2_connector_first_link(v4l2c) \ + list_first_entry_or_null(&(v4l2c)->links, \ + struct v4l2_connector_link, head) + +/** v4l2_connector_last_link - Helper macro to get the last + * &struct v4l2_fwnode_connector link + * @v4l2c: &struct v4l2_fwnode_connector owning the connector links + * + * This marco returns the last &struct v4l2_connector_link added connector link. + */ +#define v4l2_connector_last_link(v4l2c) \ + list_last_entry(&(v4l2c)->links, struct v4l2_connector_link, head) + #endif /* _V4L2_FWNODE_H */ |