diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-fwnode.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-fwnode.c | 958 |
1 files changed, 958 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c new file mode 100644 index 000000000..169bdbb1f --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -0,0 +1,958 @@ +/* + * 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 <sakari.ailus@linux.intel.com> + * + * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. + * Author: 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/acpi.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/types.h> + +#include <media/v4l2-async.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +enum v4l2_fwnode_bus_type { + V4L2_FWNODE_BUS_TYPE_GUESS = 0, + V4L2_FWNODE_BUS_TYPE_CSI2_CPHY, + V4L2_FWNODE_BUS_TYPE_CSI1, + V4L2_FWNODE_BUS_TYPE_CCP2, + NR_OF_V4L2_FWNODE_BUS_TYPE, +}; + +static int v4l2_fwnode_endpoint_parse_csi2_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[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES]; + + bus->num_data_lanes = + min_t(int, V4L2_FWNODE_CSI2_MAX_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) { + if (rval != 1 + bus->num_data_lanes /* clock+data */) { + pr_warn("invalid number of 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; + + if (!fwnode_property_read_u32(fwnode, "data-enable-active", &v)) + flags |= v ? V4L2_MBUS_DATA_ENABLE_HIGH : + V4L2_MBUS_DATA_ENABLE_LOW; + + bus->flags = flags; + +} + +static void +v4l2_fwnode_endpoint_parse_csi1_bus(struct fwnode_handle *fwnode, + struct v4l2_fwnode_endpoint *vep, + u32 bus_type) +{ + struct v4l2_fwnode_bus_mipi_csi1 *bus = &vep->bus.mipi_csi1; + u32 v; + + if (!fwnode_property_read_u32(fwnode, "clock-inv", &v)) + bus->clock_inv = v; + + if (!fwnode_property_read_u32(fwnode, "strobe", &v)) + bus->strobe = v; + + if (!fwnode_property_read_u32(fwnode, "data-lanes", &v)) + bus->data_lane = v; + + if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) + bus->clock_lane = v; + + if (bus_type == V4L2_FWNODE_BUS_TYPE_CCP2) + vep->bus_type = V4L2_MBUS_CCP2; + else + vep->bus_type = V4L2_MBUS_CSI1; +} + +int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode, + struct v4l2_fwnode_endpoint *vep) +{ + u32 bus_type = 0; + 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)); + + fwnode_property_read_u32(fwnode, "bus-type", &bus_type); + + switch (bus_type) { + case V4L2_FWNODE_BUS_TYPE_GUESS: + rval = v4l2_fwnode_endpoint_parse_csi2_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; + case V4L2_FWNODE_BUS_TYPE_CCP2: + case V4L2_FWNODE_BUS_TYPE_CSI1: + v4l2_fwnode_endpoint_parse_csi1_bus(fwnode, vep, bus_type); + + return 0; + default: + pr_warn("unsupported bus type %u\n", bus_type); + return -EINVAL; + } +} +EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_parse); + +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); + +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) { + 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); + +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); + +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); + +static int v4l2_async_notifier_realloc(struct v4l2_async_notifier *notifier, + unsigned int max_subdevs) +{ + struct v4l2_async_subdev **subdevs; + + if (max_subdevs <= notifier->max_subdevs) + return 0; + + subdevs = kvmalloc_array( + max_subdevs, sizeof(*notifier->subdevs), + GFP_KERNEL | __GFP_ZERO); + if (!subdevs) + return -ENOMEM; + + if (notifier->subdevs) { + memcpy(subdevs, notifier->subdevs, + sizeof(*subdevs) * notifier->num_subdevs); + + kvfree(notifier->subdevs); + } + + notifier->subdevs = subdevs; + notifier->max_subdevs = max_subdevs; + + return 0; +} + +static int v4l2_async_notifier_fwnode_parse_endpoint( + struct device *dev, struct v4l2_async_notifier *notifier, + struct fwnode_handle *endpoint, unsigned int asd_struct_size, + int (*parse_endpoint)(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd)) +{ + struct v4l2_async_subdev *asd; + struct v4l2_fwnode_endpoint *vep; + int ret = 0; + + asd = kzalloc(asd_struct_size, GFP_KERNEL); + if (!asd) + return -ENOMEM; + + asd->match_type = V4L2_ASYNC_MATCH_FWNODE; + asd->match.fwnode = + fwnode_graph_get_remote_port_parent(endpoint); + if (!asd->match.fwnode) { + dev_warn(dev, "bad remote port parent\n"); + ret = -EINVAL; + goto out_err; + } + + vep = v4l2_fwnode_endpoint_alloc_parse(endpoint); + if (IS_ERR(vep)) { + ret = PTR_ERR(vep); + dev_warn(dev, "unable to parse V4L2 fwnode endpoint (%d)\n", + ret); + goto out_err; + } + + ret = parse_endpoint ? parse_endpoint(dev, vep, asd) : 0; + if (ret == -ENOTCONN) + dev_dbg(dev, "ignoring port@%u/endpoint@%u\n", vep->base.port, + vep->base.id); + else if (ret < 0) + dev_warn(dev, + "driver could not parse port@%u/endpoint@%u (%d)\n", + vep->base.port, vep->base.id, ret); + v4l2_fwnode_endpoint_free(vep); + if (ret < 0) + goto out_err; + + notifier->subdevs[notifier->num_subdevs] = asd; + notifier->num_subdevs++; + + return 0; + +out_err: + fwnode_handle_put(asd->match.fwnode); + kfree(asd); + + return ret == -ENOTCONN ? 0 : ret; +} + +static int __v4l2_async_notifier_parse_fwnode_endpoints( + struct device *dev, struct v4l2_async_notifier *notifier, + size_t asd_struct_size, unsigned int port, bool has_port, + int (*parse_endpoint)(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd)) +{ + struct fwnode_handle *fwnode; + unsigned int max_subdevs = notifier->max_subdevs; + int ret; + + if (WARN_ON(asd_struct_size < sizeof(struct v4l2_async_subdev))) + return -EINVAL; + + for (fwnode = NULL; (fwnode = fwnode_graph_get_next_endpoint( + dev_fwnode(dev), fwnode)); ) { + struct fwnode_handle *dev_fwnode; + bool is_available; + + dev_fwnode = fwnode_graph_get_port_parent(fwnode); + is_available = fwnode_device_is_available(dev_fwnode); + fwnode_handle_put(dev_fwnode); + if (!is_available) + continue; + + if (has_port) { + struct fwnode_endpoint ep; + + ret = fwnode_graph_parse_endpoint(fwnode, &ep); + if (ret) { + fwnode_handle_put(fwnode); + return ret; + } + + if (ep.port != port) + continue; + } + max_subdevs++; + } + + /* No subdevs to add? Return here. */ + if (max_subdevs == notifier->max_subdevs) + return 0; + + ret = v4l2_async_notifier_realloc(notifier, max_subdevs); + if (ret) + return ret; + + for (fwnode = NULL; (fwnode = fwnode_graph_get_next_endpoint( + dev_fwnode(dev), fwnode)); ) { + struct fwnode_handle *dev_fwnode; + bool is_available; + + dev_fwnode = fwnode_graph_get_port_parent(fwnode); + is_available = fwnode_device_is_available(dev_fwnode); + fwnode_handle_put(dev_fwnode); + if (!is_available) + continue; + + if (has_port) { + struct fwnode_endpoint ep; + + ret = fwnode_graph_parse_endpoint(fwnode, &ep); + if (ret) + break; + + if (ep.port != port) + continue; + } + + if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) { + ret = -EINVAL; + break; + } + + ret = v4l2_async_notifier_fwnode_parse_endpoint( + dev, notifier, fwnode, asd_struct_size, parse_endpoint); + if (ret < 0) + break; + } + + fwnode_handle_put(fwnode); + + return ret; +} + +int v4l2_async_notifier_parse_fwnode_endpoints( + struct device *dev, struct v4l2_async_notifier *notifier, + size_t asd_struct_size, + int (*parse_endpoint)(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd)) +{ + return __v4l2_async_notifier_parse_fwnode_endpoints( + dev, notifier, asd_struct_size, 0, false, parse_endpoint); +} +EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints); + +int v4l2_async_notifier_parse_fwnode_endpoints_by_port( + struct device *dev, struct v4l2_async_notifier *notifier, + size_t asd_struct_size, unsigned int port, + int (*parse_endpoint)(struct device *dev, + struct v4l2_fwnode_endpoint *vep, + struct v4l2_async_subdev *asd)) +{ + return __v4l2_async_notifier_parse_fwnode_endpoints( + dev, notifier, asd_struct_size, port, true, parse_endpoint); +} +EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints_by_port); + +/* + * v4l2_fwnode_reference_parse - parse references for async sub-devices + * @dev: the device node the properties of which are parsed for references + * @notifier: the async notifier where the async subdevs will be added + * @prop: the name of the property + * + * Return: 0 on success + * -ENOENT if no entries were found + * -ENOMEM if memory allocation failed + * -EINVAL if property parsing failed + */ +static int v4l2_fwnode_reference_parse( + struct device *dev, struct v4l2_async_notifier *notifier, + const char *prop) +{ + struct fwnode_reference_args args; + unsigned int index; + int ret; + + for (index = 0; + !(ret = fwnode_property_get_reference_args( + dev_fwnode(dev), prop, NULL, 0, index, &args)); + index++) + fwnode_handle_put(args.fwnode); + + if (!index) + return -ENOENT; + + /* + * Note that right now both -ENODATA and -ENOENT may signal + * out-of-bounds access. Return the error in cases other than that. + */ + if (ret != -ENOENT && ret != -ENODATA) + return ret; + + ret = v4l2_async_notifier_realloc(notifier, + notifier->num_subdevs + index); + if (ret) + return ret; + + for (index = 0; !fwnode_property_get_reference_args( + dev_fwnode(dev), prop, NULL, 0, index, &args); + index++) { + struct v4l2_async_subdev *asd; + + if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) { + ret = -EINVAL; + goto error; + } + + asd = kzalloc(sizeof(*asd), GFP_KERNEL); + if (!asd) { + ret = -ENOMEM; + goto error; + } + + notifier->subdevs[notifier->num_subdevs] = asd; + asd->match.fwnode = args.fwnode; + asd->match_type = V4L2_ASYNC_MATCH_FWNODE; + notifier->num_subdevs++; + } + + return 0; + +error: + fwnode_handle_put(args.fwnode); + return ret; +} + +/* + * v4l2_fwnode_reference_get_int_prop - parse a reference with integer + * arguments + * @fwnode: fwnode to read @prop from + * @notifier: notifier for @dev + * @prop: the name of the property + * @index: the index of the reference to get + * @props: the array of integer property names + * @nprops: the number of integer property names in @nprops + * + * First find an fwnode referred to by the reference at @index in @prop. + * + * Then under that fwnode, @nprops times, for each property in @props, + * iteratively follow child nodes starting from fwnode such that they have the + * property in @props array at the index of the child node distance from the + * root node and the value of that property matching with the integer argument + * of the reference, at the same index. + * + * The child fwnode reched at the end of the iteration is then returned to the + * caller. + * + * The core reason for this is that you cannot refer to just any node in ACPI. + * So to refer to an endpoint (easy in DT) you need to refer to a device, then + * provide a list of (property name, property value) tuples where each tuple + * uniquely identifies a child node. The first tuple identifies a child directly + * underneath the device fwnode, the next tuple identifies a child node + * underneath the fwnode identified by the previous tuple, etc. until you + * reached the fwnode you need. + * + * An example with a graph, as defined in Documentation/acpi/dsd/graph.txt: + * + * Scope (\_SB.PCI0.I2C2) + * { + * Device (CAM0) + * { + * Name (_DSD, Package () { + * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + * Package () { + * Package () { + * "compatible", + * Package () { "nokia,smia" } + * }, + * }, + * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"), + * Package () { + * Package () { "port0", "PRT0" }, + * } + * }) + * Name (PRT0, Package() { + * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + * Package () { + * Package () { "port", 0 }, + * }, + * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"), + * Package () { + * Package () { "endpoint0", "EP00" }, + * } + * }) + * Name (EP00, Package() { + * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + * Package () { + * Package () { "endpoint", 0 }, + * Package () { + * "remote-endpoint", + * Package() { + * \_SB.PCI0.ISP, 4, 0 + * } + * }, + * } + * }) + * } + * } + * + * Scope (\_SB.PCI0) + * { + * Device (ISP) + * { + * Name (_DSD, Package () { + * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"), + * Package () { + * Package () { "port4", "PRT4" }, + * } + * }) + * + * Name (PRT4, Package() { + * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + * Package () { + * Package () { "port", 4 }, + * }, + * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"), + * Package () { + * Package () { "endpoint0", "EP40" }, + * } + * }) + * + * Name (EP40, Package() { + * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + * Package () { + * Package () { "endpoint", 0 }, + * Package () { + * "remote-endpoint", + * Package () { + * \_SB.PCI0.I2C2.CAM0, + * 0, 0 + * } + * }, + * } + * }) + * } + * } + * + * From the EP40 node under ISP device, you could parse the graph remote + * endpoint using v4l2_fwnode_reference_get_int_prop with these arguments: + * + * @fwnode: fwnode referring to EP40 under ISP. + * @prop: "remote-endpoint" + * @index: 0 + * @props: "port", "endpoint" + * @nprops: 2 + * + * And you'd get back fwnode referring to EP00 under CAM0. + * + * The same works the other way around: if you use EP00 under CAM0 as the + * fwnode, you'll get fwnode referring to EP40 under ISP. + * + * The same example in DT syntax would look like this: + * + * cam: cam0 { + * compatible = "nokia,smia"; + * + * port { + * port = <0>; + * endpoint { + * endpoint = <0>; + * remote-endpoint = <&isp 4 0>; + * }; + * }; + * }; + * + * isp: isp { + * ports { + * port@4 { + * port = <4>; + * endpoint { + * endpoint = <0>; + * remote-endpoint = <&cam 0 0>; + * }; + * }; + * }; + * }; + * + * Return: 0 on success + * -ENOENT if no entries (or the property itself) were found + * -EINVAL if property parsing otherwise failed + * -ENOMEM if memory allocation failed + */ +static struct fwnode_handle *v4l2_fwnode_reference_get_int_prop( + struct fwnode_handle *fwnode, const char *prop, unsigned int index, + const char * const *props, unsigned int nprops) +{ + struct fwnode_reference_args fwnode_args; + u64 *args = fwnode_args.args; + struct fwnode_handle *child; + int ret; + + /* + * Obtain remote fwnode as well as the integer arguments. + * + * Note that right now both -ENODATA and -ENOENT may signal + * out-of-bounds access. Return -ENOENT in that case. + */ + ret = fwnode_property_get_reference_args(fwnode, prop, NULL, nprops, + index, &fwnode_args); + if (ret) + return ERR_PTR(ret == -ENODATA ? -ENOENT : ret); + + /* + * Find a node in the tree under the referred fwnode corresponding to + * the integer arguments. + */ + fwnode = fwnode_args.fwnode; + while (nprops--) { + u32 val; + + /* Loop over all child nodes under fwnode. */ + fwnode_for_each_child_node(fwnode, child) { + if (fwnode_property_read_u32(child, *props, &val)) + continue; + + /* Found property, see if its value matches. */ + if (val == *args) + break; + } + + fwnode_handle_put(fwnode); + + /* No property found; return an error here. */ + if (!child) { + fwnode = ERR_PTR(-ENOENT); + break; + } + + props++; + args++; + fwnode = child; + } + + return fwnode; +} + +/* + * v4l2_fwnode_reference_parse_int_props - parse references for async + * sub-devices + * @dev: struct device pointer + * @notifier: notifier for @dev + * @prop: the name of the property + * @props: the array of integer property names + * @nprops: the number of integer properties + * + * Use v4l2_fwnode_reference_get_int_prop to find fwnodes through reference in + * property @prop with integer arguments with child nodes matching in properties + * @props. Then, set up V4L2 async sub-devices for those fwnodes in the notifier + * accordingly. + * + * While it is technically possible to use this function on DT, it is only + * meaningful on ACPI. On Device tree you can refer to any node in the tree but + * on ACPI the references are limited to devices. + * + * Return: 0 on success + * -ENOENT if no entries (or the property itself) were found + * -EINVAL if property parsing otherwisefailed + * -ENOMEM if memory allocation failed + */ +static int v4l2_fwnode_reference_parse_int_props( + struct device *dev, struct v4l2_async_notifier *notifier, + const char *prop, const char * const *props, unsigned int nprops) +{ + struct fwnode_handle *fwnode; + unsigned int index; + int ret; + + index = 0; + do { + fwnode = v4l2_fwnode_reference_get_int_prop(dev_fwnode(dev), + prop, index, + props, nprops); + if (IS_ERR(fwnode)) { + /* + * Note that right now both -ENODATA and -ENOENT may + * signal out-of-bounds access. Return the error in + * cases other than that. + */ + if (PTR_ERR(fwnode) != -ENOENT && + PTR_ERR(fwnode) != -ENODATA) + return PTR_ERR(fwnode); + break; + } + fwnode_handle_put(fwnode); + index++; + } while (1); + + ret = v4l2_async_notifier_realloc(notifier, + notifier->num_subdevs + index); + if (ret) + return -ENOMEM; + + for (index = 0; !IS_ERR((fwnode = v4l2_fwnode_reference_get_int_prop( + dev_fwnode(dev), prop, index, props, + nprops))); index++) { + struct v4l2_async_subdev *asd; + + if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) { + ret = -EINVAL; + goto error; + } + + asd = kzalloc(sizeof(struct v4l2_async_subdev), GFP_KERNEL); + if (!asd) { + ret = -ENOMEM; + goto error; + } + + notifier->subdevs[notifier->num_subdevs] = asd; + asd->match.fwnode = fwnode; + asd->match_type = V4L2_ASYNC_MATCH_FWNODE; + notifier->num_subdevs++; + } + + return PTR_ERR(fwnode) == -ENOENT ? 0 : PTR_ERR(fwnode); + +error: + fwnode_handle_put(fwnode); + return ret; +} + +int v4l2_async_notifier_parse_fwnode_sensor_common( + struct device *dev, struct v4l2_async_notifier *notifier) +{ + static const char * const led_props[] = { "led" }; + static const struct { + const char *name; + const char * const *props; + unsigned int nprops; + } props[] = { + { "flash-leds", led_props, ARRAY_SIZE(led_props) }, + { "lens-focus", NULL, 0 }, + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(props); i++) { + int ret; + + if (props[i].props && is_acpi_node(dev_fwnode(dev))) + ret = v4l2_fwnode_reference_parse_int_props( + dev, notifier, props[i].name, + props[i].props, props[i].nprops); + else + ret = v4l2_fwnode_reference_parse( + dev, notifier, props[i].name); + if (ret && ret != -ENOENT) { + dev_warn(dev, "parsing property \"%s\" failed (%d)\n", + props[i].name, ret); + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_sensor_common); + +int v4l2_async_register_subdev_sensor_common(struct v4l2_subdev *sd) +{ + struct v4l2_async_notifier *notifier; + int ret; + + if (WARN_ON(!sd->dev)) + return -ENODEV; + + notifier = kzalloc(sizeof(*notifier), GFP_KERNEL); + if (!notifier) + return -ENOMEM; + + ret = v4l2_async_notifier_parse_fwnode_sensor_common(sd->dev, + notifier); + if (ret < 0) + goto out_cleanup; + + ret = v4l2_async_subdev_notifier_register(sd, notifier); + if (ret < 0) + goto out_cleanup; + + ret = v4l2_async_register_subdev(sd); + if (ret < 0) + goto out_unregister; + + sd->subdev_notifier = notifier; + + return 0; + +out_unregister: + v4l2_async_notifier_unregister(notifier); + +out_cleanup: + v4l2_async_notifier_cleanup(notifier); + kfree(notifier); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_async_register_subdev_sensor_common); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>"); +MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); |