/* * V4L2 fwnode binding parsing library * * The origins of the V4L2 fwnode library are in V4L2 OF library that * formerly was located in v4l2-of.c. * * Copyright (c) 2016 Intel Corporation. * Author: Sakari Ailus * * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. * Author: Sylwester Nawrocki * * Copyright (C) 2012 Renesas Electronics Corp. * Author: Guennadi Liakhovetski * * 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 #include #include #include #include #include #include #include #include static int v4l2_fwnode_endpoint_parse_csi_bus(struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep) { struct v4l2_fwnode_bus_mipi_csi2 *bus = &vep->bus.mipi_csi2; bool have_clk_lane = false; unsigned int flags = 0, lanes_used = 0; unsigned int i; u32 v; int rval; rval = fwnode_property_read_u32_array(fwnode, "data-lanes", NULL, 0); if (rval > 0) { u32 array[ARRAY_SIZE(bus->data_lanes)]; bus->num_data_lanes = min_t(int, ARRAY_SIZE(bus->data_lanes), rval); fwnode_property_read_u32_array(fwnode, "data-lanes", array, bus->num_data_lanes); for (i = 0; i < bus->num_data_lanes; i++) { if (lanes_used & BIT(array[i])) pr_warn("duplicated lane %u in data-lanes\n", array[i]); lanes_used |= BIT(array[i]); bus->data_lanes[i] = array[i]; } } rval = fwnode_property_read_u32_array(fwnode, "lane-polarities", NULL, 0); if (rval > 0) { u32 array[ARRAY_SIZE(bus->lane_polarities)]; if (rval < 1 + bus->num_data_lanes /* clock + data */) { pr_warn("too few lane-polarities entries (need %u, got %u)\n", 1 + bus->num_data_lanes, rval); return -EINVAL; } fwnode_property_read_u32_array(fwnode, "lane-polarities", array, 1 + bus->num_data_lanes); for (i = 0; i < 1 + bus->num_data_lanes; i++) bus->lane_polarities[i] = array[i]; } if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) { if (lanes_used & BIT(v)) pr_warn("duplicated lane %u in clock-lanes\n", v); lanes_used |= BIT(v); bus->clock_lane = v; have_clk_lane = true; } if (fwnode_property_present(fwnode, "clock-noncontinuous")) 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; vep->bus_type = V4L2_MBUS_CSI2; return 0; } static void v4l2_fwnode_endpoint_parse_parallel_bus( struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep) { struct v4l2_fwnode_bus_parallel *bus = &vep->bus.parallel; unsigned int flags = 0; u32 v; if (!fwnode_property_read_u32(fwnode, "hsync-active", &v)) flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH : V4L2_MBUS_HSYNC_ACTIVE_LOW; if (!fwnode_property_read_u32(fwnode, "vsync-active", &v)) flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH : V4L2_MBUS_VSYNC_ACTIVE_LOW; if (!fwnode_property_read_u32(fwnode, "field-even-active", &v)) flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH : V4L2_MBUS_FIELD_EVEN_LOW; if (flags) vep->bus_type = V4L2_MBUS_PARALLEL; else vep->bus_type = V4L2_MBUS_BT656; if (!fwnode_property_read_u32(fwnode, "pclk-sample", &v)) flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING : V4L2_MBUS_PCLK_SAMPLE_FALLING; if (!fwnode_property_read_u32(fwnode, "data-active", &v)) flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH : V4L2_MBUS_DATA_ACTIVE_LOW; if (fwnode_property_present(fwnode, "slave-mode")) flags |= V4L2_MBUS_SLAVE; else flags |= V4L2_MBUS_MASTER; if (!fwnode_property_read_u32(fwnode, "bus-width", &v)) bus->bus_width = v; if (!fwnode_property_read_u32(fwnode, "data-shift", &v)) bus->data_shift = v; if (!fwnode_property_read_u32(fwnode, "sync-on-green-active", &v)) flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH : V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW; bus->flags = flags; } /** * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties * @fwnode: pointer to the endpoint's fwnode handle * @vep: pointer to the V4L2 fwnode 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 @fwnode. * * NOTE: This function does not parse properties the size of which is variable * without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in * new drivers instead. * * Return: 0 on success or a negative error code on failure. */ int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep) { int rval; fwnode_graph_parse_endpoint(fwnode, &vep->base); /* Zero fields from bus_type to until the end */ memset(&vep->bus_type, 0, sizeof(*vep) - offsetof(typeof(*vep), bus_type)); rval = v4l2_fwnode_endpoint_parse_csi_bus(fwnode, vep); if (rval) return rval; /* * Parse the parallel video bus properties only if none * of the MIPI CSI-2 specific properties were found. */ if (vep->bus.mipi_csi2.flags == 0) v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep); return 0; } EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_parse); /* * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by * v4l2_fwnode_endpoint_alloc_parse() * @vep - the V4L2 fwnode the resources of which are to be released * * It is safe to call this function with NULL argument or on a V4L2 fwnode the * parsing of which failed. */ void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep) { if (IS_ERR_OR_NULL(vep)) return; kfree(vep->link_frequencies); kfree(vep); } EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_free); /** * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties * @fwnode: pointer to the endpoint's fwnode handle * * 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 @fwnode. * * v4l2_fwnode_endpoint_alloc_parse() has two important differences to * v4l2_fwnode_endpoint_parse(): * * 1. It also parses variable size data. * * 2. The memory it has allocated to store the variable size data must be freed * using v4l2_fwnode_endpoint_free() when no longer needed. * * Return: Pointer to v4l2_fwnode_endpoint if successful, on an error pointer * on error. */ struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse( struct fwnode_handle *fwnode) { struct v4l2_fwnode_endpoint *vep; int rval; vep = kzalloc(sizeof(*vep), GFP_KERNEL); if (!vep) return ERR_PTR(-ENOMEM); rval = v4l2_fwnode_endpoint_parse(fwnode, vep); if (rval < 0) goto out_err; rval = fwnode_property_read_u64_array(fwnode, "link-frequencies", NULL, 0); if (rval < 0) goto out_err; vep->link_frequencies = kmalloc_array(rval, sizeof(*vep->link_frequencies), GFP_KERNEL); if (!vep->link_frequencies) { rval = -ENOMEM; goto out_err; } vep->nr_of_link_frequencies = rval; rval = fwnode_property_read_u64_array(fwnode, "link-frequencies", vep->link_frequencies, vep->nr_of_link_frequencies); if (rval < 0) goto out_err; return vep; out_err: v4l2_fwnode_endpoint_free(vep); return ERR_PTR(rval); } EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_alloc_parse); /** * v4l2_fwnode_endpoint_parse_link() - parse a link between two endpoints * @__fwnode: pointer to the endpoint's fwnode at the local end of the link * @link: pointer to the V4L2 fwnode link data structure * * Fill the link structure with the local and remote nodes and port numbers. * The local_node and remote_node fields are set to point to the local and * remote port's parent nodes respectively (the port parent node being the * parent node of the port node if that node isn't a 'ports' node, or the * grand-parent node of the port node otherwise). * * A reference is taken to both the local and remote nodes, the caller must use * v4l2_fwnode_endpoint_put_link() to drop the references when done with the * link. * * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be * found. */ int v4l2_fwnode_parse_link(struct fwnode_handle *__fwnode, struct v4l2_fwnode_link *link) { const char *port_prop = is_of_node(__fwnode) ? "reg" : "port"; struct fwnode_handle *fwnode; memset(link, 0, sizeof(*link)); fwnode = fwnode_get_parent(__fwnode); fwnode_property_read_u32(fwnode, port_prop, &link->local_port); fwnode = fwnode_get_next_parent(fwnode); if (is_of_node(fwnode) && of_node_cmp(to_of_node(fwnode)->name, "ports") == 0) fwnode = fwnode_get_next_parent(fwnode); link->local_node = fwnode; fwnode = fwnode_graph_get_remote_endpoint(__fwnode); if (!fwnode) { fwnode_handle_put(fwnode); return -ENOLINK; } fwnode = fwnode_get_parent(fwnode); fwnode_property_read_u32(fwnode, port_prop, &link->remote_port); fwnode = fwnode_get_next_parent(fwnode); if (is_of_node(fwnode) && of_node_cmp(to_of_node(fwnode)->name, "ports") == 0) fwnode = fwnode_get_next_parent(fwnode); link->remote_node = fwnode; return 0; } EXPORT_SYMBOL_GPL(v4l2_fwnode_parse_link); /** * v4l2_fwnode_put_link() - drop references to nodes in a link * @link: pointer to the V4L2 fwnode link data structure * * Drop references to the local and remote nodes in the link. This function * must be called on every link parsed with v4l2_fwnode_parse_link(). */ void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link) { fwnode_handle_put(link->local_node); fwnode_handle_put(link->remote_node); } EXPORT_SYMBOL_GPL(v4l2_fwnode_put_link); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Sakari Ailus "); MODULE_AUTHOR("Sylwester Nawrocki "); MODULE_AUTHOR("Guennadi Liakhovetski ");