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- /*
- * uvc_gadget.c -- USB Video Class Gadget driver
- *
- * Copyright (C) 2009-2010
- * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/device.h>
- #include <linux/errno.h>
- #include <linux/fs.h>
- #include <linux/list.h>
- #include <linux/mutex.h>
- #include <linux/string.h>
- #include <linux/usb/ch9.h>
- #include <linux/usb/gadget.h>
- #include <linux/usb/video.h>
- #include <linux/vmalloc.h>
- #include <linux/wait.h>
- #include <media/v4l2-dev.h>
- #include <media/v4l2-event.h>
- #include "u_uvc.h"
- #include "uvc.h"
- #include "uvc_configfs.h"
- #include "uvc_v4l2.h"
- #include "uvc_video.h"
- unsigned int uvc_gadget_trace_param;
- /* --------------------------------------------------------------------------
- * Function descriptors
- */
- /* string IDs are assigned dynamically */
- #define UVC_STRING_CONTROL_IDX 0
- #define UVC_STRING_STREAMING_IDX 1
- static struct usb_string uvc_en_us_strings[] = {
- [UVC_STRING_CONTROL_IDX].s = "UVC Camera",
- [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
- { }
- };
- static struct usb_gadget_strings uvc_stringtab = {
- .language = 0x0409, /* en-us */
- .strings = uvc_en_us_strings,
- };
- static struct usb_gadget_strings *uvc_function_strings[] = {
- &uvc_stringtab,
- NULL,
- };
- #define UVC_INTF_VIDEO_CONTROL 0
- #define UVC_INTF_VIDEO_STREAMING 1
- #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */
- static struct usb_interface_assoc_descriptor uvc_iad = {
- .bLength = sizeof(uvc_iad),
- .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
- .bFirstInterface = 0,
- .bInterfaceCount = 2,
- .bFunctionClass = USB_CLASS_VIDEO,
- .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
- .bFunctionProtocol = 0x00,
- .iFunction = 0,
- };
- static struct usb_interface_descriptor uvc_control_intf = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
- .bAlternateSetting = 0,
- .bNumEndpoints = 1,
- .bInterfaceClass = USB_CLASS_VIDEO,
- .bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
- .bInterfaceProtocol = 0x00,
- .iInterface = 0,
- };
- static struct usb_endpoint_descriptor uvc_control_ep = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_INT,
- .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
- .bInterval = 8,
- };
- static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = {
- .bLength = sizeof(uvc_ss_control_comp),
- .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
- /* The following 3 values can be tweaked if necessary. */
- .bMaxBurst = 0,
- .bmAttributes = 0,
- .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
- };
- static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = {
- .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_CS_ENDPOINT,
- .bDescriptorSubType = UVC_EP_INTERRUPT,
- .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
- };
- static struct usb_interface_descriptor uvc_streaming_intf_alt0 = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
- .bAlternateSetting = 0,
- .bNumEndpoints = 0,
- .bInterfaceClass = USB_CLASS_VIDEO,
- .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
- .bInterfaceProtocol = 0x00,
- .iInterface = 0,
- };
- static struct usb_interface_descriptor uvc_streaming_intf_alt1 = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
- .bAlternateSetting = 1,
- .bNumEndpoints = 1,
- .bInterfaceClass = USB_CLASS_VIDEO,
- .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
- .bInterfaceProtocol = 0x00,
- .iInterface = 0,
- };
- static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
- | USB_ENDPOINT_XFER_ISOC,
- /* The wMaxPacketSize and bInterval values will be initialized from
- * module parameters.
- */
- };
- static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
- | USB_ENDPOINT_XFER_ISOC,
- /* The wMaxPacketSize and bInterval values will be initialized from
- * module parameters.
- */
- };
- static struct usb_endpoint_descriptor uvc_ss_streaming_ep = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
- | USB_ENDPOINT_XFER_ISOC,
- /* The wMaxPacketSize and bInterval values will be initialized from
- * module parameters.
- */
- };
- static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
- .bLength = sizeof(uvc_ss_streaming_comp),
- .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
- /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
- * initialized from module parameters.
- */
- };
- static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
- (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
- (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
- NULL,
- };
- static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
- (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
- (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
- NULL,
- };
- static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
- (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
- (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
- (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
- NULL,
- };
- void uvc_set_trace_param(unsigned int trace)
- {
- uvc_gadget_trace_param = trace;
- }
- EXPORT_SYMBOL(uvc_set_trace_param);
- /* --------------------------------------------------------------------------
- * Control requests
- */
- static void
- uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
- {
- struct uvc_device *uvc = req->context;
- struct v4l2_event v4l2_event;
- struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
- if (uvc->event_setup_out) {
- uvc->event_setup_out = 0;
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_DATA;
- uvc_event->data.length = req->actual;
- memcpy(&uvc_event->data.data, req->buf, req->actual);
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- }
- }
- static int
- uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
- {
- struct uvc_device *uvc = to_uvc(f);
- struct v4l2_event v4l2_event;
- struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
- /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
- * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
- * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
- */
- if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
- INFO(f->config->cdev, "invalid request type\n");
- return -EINVAL;
- }
- /* Stall too big requests. */
- if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
- return -EINVAL;
- /* Tell the complete callback to generate an event for the next request
- * that will be enqueued by UVCIOC_SEND_RESPONSE.
- */
- uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
- uvc->event_length = le16_to_cpu(ctrl->wLength);
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_SETUP;
- memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- return 0;
- }
- void uvc_function_setup_continue(struct uvc_device *uvc)
- {
- struct usb_composite_dev *cdev = uvc->func.config->cdev;
- usb_composite_setup_continue(cdev);
- }
- static int
- uvc_function_get_alt(struct usb_function *f, unsigned interface)
- {
- struct uvc_device *uvc = to_uvc(f);
- INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
- if (interface == uvc->control_intf)
- return 0;
- else if (interface != uvc->streaming_intf)
- return -EINVAL;
- else
- return uvc->video.ep->enabled ? 1 : 0;
- }
- static int
- uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
- {
- struct uvc_device *uvc = to_uvc(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- struct v4l2_event v4l2_event;
- struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
- int ret;
- INFO(cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
- if (interface == uvc->control_intf) {
- if (alt)
- return -EINVAL;
- INFO(cdev, "reset UVC Control\n");
- usb_ep_disable(uvc->control_ep);
- if (!uvc->control_ep->desc)
- if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep))
- return -EINVAL;
- usb_ep_enable(uvc->control_ep);
- if (uvc->state == UVC_STATE_DISCONNECTED) {
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_CONNECT;
- uvc_event->speed = cdev->gadget->speed;
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- uvc->state = UVC_STATE_CONNECTED;
- }
- return 0;
- }
- if (interface != uvc->streaming_intf)
- return -EINVAL;
- /* TODO
- if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
- return alt ? -EINVAL : 0;
- */
- switch (alt) {
- case 0:
- if (uvc->state != UVC_STATE_STREAMING)
- return 0;
- if (uvc->video.ep)
- usb_ep_disable(uvc->video.ep);
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_STREAMOFF;
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- uvc->state = UVC_STATE_CONNECTED;
- return 0;
- case 1:
- if (uvc->state != UVC_STATE_CONNECTED)
- return 0;
- if (!uvc->video.ep)
- return -EINVAL;
- INFO(cdev, "reset UVC\n");
- usb_ep_disable(uvc->video.ep);
- ret = config_ep_by_speed(f->config->cdev->gadget,
- &(uvc->func), uvc->video.ep);
- if (ret)
- return ret;
- usb_ep_enable(uvc->video.ep);
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_STREAMON;
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- return USB_GADGET_DELAYED_STATUS;
- default:
- return -EINVAL;
- }
- }
- static void
- uvc_function_disable(struct usb_function *f)
- {
- struct uvc_device *uvc = to_uvc(f);
- struct v4l2_event v4l2_event;
- INFO(f->config->cdev, "uvc_function_disable\n");
- memset(&v4l2_event, 0, sizeof(v4l2_event));
- v4l2_event.type = UVC_EVENT_DISCONNECT;
- v4l2_event_queue(&uvc->vdev, &v4l2_event);
- uvc->state = UVC_STATE_DISCONNECTED;
- usb_ep_disable(uvc->video.ep);
- usb_ep_disable(uvc->control_ep);
- }
- /* --------------------------------------------------------------------------
- * Connection / disconnection
- */
- void
- uvc_function_connect(struct uvc_device *uvc)
- {
- struct usb_composite_dev *cdev = uvc->func.config->cdev;
- int ret;
- if ((ret = usb_function_activate(&uvc->func)) < 0)
- INFO(cdev, "UVC connect failed with %d\n", ret);
- }
- void
- uvc_function_disconnect(struct uvc_device *uvc)
- {
- struct usb_composite_dev *cdev = uvc->func.config->cdev;
- int ret;
- if ((ret = usb_function_deactivate(&uvc->func)) < 0)
- INFO(cdev, "UVC disconnect failed with %d\n", ret);
- }
- /* --------------------------------------------------------------------------
- * USB probe and disconnect
- */
- static int
- uvc_register_video(struct uvc_device *uvc)
- {
- struct usb_composite_dev *cdev = uvc->func.config->cdev;
- /* TODO reference counting. */
- uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
- uvc->vdev.fops = &uvc_v4l2_fops;
- uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops;
- uvc->vdev.release = video_device_release_empty;
- uvc->vdev.vfl_dir = VFL_DIR_TX;
- uvc->vdev.lock = &uvc->video.mutex;
- strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
- video_set_drvdata(&uvc->vdev, uvc);
- return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1);
- }
- #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
- do { \
- memcpy(mem, desc, (desc)->bLength); \
- *(dst)++ = mem; \
- mem += (desc)->bLength; \
- } while (0);
- #define UVC_COPY_DESCRIPTORS(mem, dst, src) \
- do { \
- const struct usb_descriptor_header * const *__src; \
- for (__src = src; *__src; ++__src) { \
- memcpy(mem, *__src, (*__src)->bLength); \
- *dst++ = mem; \
- mem += (*__src)->bLength; \
- } \
- } while (0)
- static struct usb_descriptor_header **
- uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
- {
- struct uvc_input_header_descriptor *uvc_streaming_header;
- struct uvc_header_descriptor *uvc_control_header;
- const struct uvc_descriptor_header * const *uvc_control_desc;
- const struct uvc_descriptor_header * const *uvc_streaming_cls;
- const struct usb_descriptor_header * const *uvc_streaming_std;
- const struct usb_descriptor_header * const *src;
- struct usb_descriptor_header **dst;
- struct usb_descriptor_header **hdr;
- unsigned int control_size;
- unsigned int streaming_size;
- unsigned int n_desc;
- unsigned int bytes;
- void *mem;
- switch (speed) {
- case USB_SPEED_SUPER:
- uvc_control_desc = uvc->desc.ss_control;
- uvc_streaming_cls = uvc->desc.ss_streaming;
- uvc_streaming_std = uvc_ss_streaming;
- break;
- case USB_SPEED_HIGH:
- uvc_control_desc = uvc->desc.fs_control;
- uvc_streaming_cls = uvc->desc.hs_streaming;
- uvc_streaming_std = uvc_hs_streaming;
- break;
- case USB_SPEED_FULL:
- default:
- uvc_control_desc = uvc->desc.fs_control;
- uvc_streaming_cls = uvc->desc.fs_streaming;
- uvc_streaming_std = uvc_fs_streaming;
- break;
- }
- if (!uvc_control_desc || !uvc_streaming_cls)
- return ERR_PTR(-ENODEV);
- /* Descriptors layout
- *
- * uvc_iad
- * uvc_control_intf
- * Class-specific UVC control descriptors
- * uvc_control_ep
- * uvc_control_cs_ep
- * uvc_ss_control_comp (for SS only)
- * uvc_streaming_intf_alt0
- * Class-specific UVC streaming descriptors
- * uvc_{fs|hs}_streaming
- */
- /* Count descriptors and compute their size. */
- control_size = 0;
- streaming_size = 0;
- bytes = uvc_iad.bLength + uvc_control_intf.bLength
- + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
- + uvc_streaming_intf_alt0.bLength;
- if (speed == USB_SPEED_SUPER) {
- bytes += uvc_ss_control_comp.bLength;
- n_desc = 6;
- } else {
- n_desc = 5;
- }
- for (src = (const struct usb_descriptor_header **)uvc_control_desc;
- *src; ++src) {
- control_size += (*src)->bLength;
- bytes += (*src)->bLength;
- n_desc++;
- }
- for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
- *src; ++src) {
- streaming_size += (*src)->bLength;
- bytes += (*src)->bLength;
- n_desc++;
- }
- for (src = uvc_streaming_std; *src; ++src) {
- bytes += (*src)->bLength;
- n_desc++;
- }
- mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
- if (mem == NULL)
- return NULL;
- hdr = mem;
- dst = mem;
- mem += (n_desc + 1) * sizeof(*src);
- /* Copy the descriptors. */
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
- uvc_control_header = mem;
- UVC_COPY_DESCRIPTORS(mem, dst,
- (const struct usb_descriptor_header **)uvc_control_desc);
- uvc_control_header->wTotalLength = cpu_to_le16(control_size);
- uvc_control_header->bInCollection = 1;
- uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
- if (speed == USB_SPEED_SUPER)
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
- UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
- uvc_streaming_header = mem;
- UVC_COPY_DESCRIPTORS(mem, dst,
- (const struct usb_descriptor_header**)uvc_streaming_cls);
- uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
- uvc_streaming_header->bEndpointAddress = uvc->video.ep->address;
- UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
- *dst = NULL;
- return hdr;
- }
- static int
- uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
- {
- struct usb_composite_dev *cdev = c->cdev;
- struct uvc_device *uvc = to_uvc(f);
- struct usb_string *us;
- unsigned int max_packet_mult;
- unsigned int max_packet_size;
- struct usb_ep *ep;
- struct f_uvc_opts *opts;
- int ret = -EINVAL;
- INFO(cdev, "uvc_function_bind\n");
- opts = fi_to_f_uvc_opts(f->fi);
- /* Sanity check the streaming endpoint module parameters.
- */
- opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
- opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
- opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
- /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
- if (opts->streaming_maxburst &&
- (opts->streaming_maxpacket % 1024) != 0) {
- opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
- INFO(cdev, "overriding streaming_maxpacket to %d\n",
- opts->streaming_maxpacket);
- }
- /* Fill in the FS/HS/SS Video Streaming specific descriptors from the
- * module parameters.
- *
- * NOTE: We assume that the user knows what they are doing and won't
- * give parameters that their UDC doesn't support.
- */
- if (opts->streaming_maxpacket <= 1024) {
- max_packet_mult = 1;
- max_packet_size = opts->streaming_maxpacket;
- } else if (opts->streaming_maxpacket <= 2048) {
- max_packet_mult = 2;
- max_packet_size = opts->streaming_maxpacket / 2;
- } else {
- max_packet_mult = 3;
- max_packet_size = opts->streaming_maxpacket / 3;
- }
- uvc_fs_streaming_ep.wMaxPacketSize =
- cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
- uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
- uvc_hs_streaming_ep.wMaxPacketSize =
- cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
- uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
- uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
- uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
- uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
- uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
- uvc_ss_streaming_comp.wBytesPerInterval =
- cpu_to_le16(max_packet_size * max_packet_mult *
- (opts->streaming_maxburst + 1));
- /* Allocate endpoints. */
- ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
- if (!ep) {
- INFO(cdev, "Unable to allocate control EP\n");
- goto error;
- }
- uvc->control_ep = ep;
- if (gadget_is_superspeed(c->cdev->gadget))
- ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
- &uvc_ss_streaming_comp);
- else if (gadget_is_dualspeed(cdev->gadget))
- ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
- else
- ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
- if (!ep) {
- INFO(cdev, "Unable to allocate streaming EP\n");
- goto error;
- }
- uvc->video.ep = ep;
- uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
- uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
- uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
- us = usb_gstrings_attach(cdev, uvc_function_strings,
- ARRAY_SIZE(uvc_en_us_strings));
- if (IS_ERR(us)) {
- ret = PTR_ERR(us);
- goto error;
- }
- uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
- uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
- ret = us[UVC_STRING_STREAMING_IDX].id;
- uvc_streaming_intf_alt0.iInterface = ret;
- uvc_streaming_intf_alt1.iInterface = ret;
- /* Allocate interface IDs. */
- if ((ret = usb_interface_id(c, f)) < 0)
- goto error;
- uvc_iad.bFirstInterface = ret;
- uvc_control_intf.bInterfaceNumber = ret;
- uvc->control_intf = ret;
- if ((ret = usb_interface_id(c, f)) < 0)
- goto error;
- uvc_streaming_intf_alt0.bInterfaceNumber = ret;
- uvc_streaming_intf_alt1.bInterfaceNumber = ret;
- uvc->streaming_intf = ret;
- /* Copy descriptors */
- f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
- if (IS_ERR(f->fs_descriptors)) {
- ret = PTR_ERR(f->fs_descriptors);
- f->fs_descriptors = NULL;
- goto error;
- }
- if (gadget_is_dualspeed(cdev->gadget)) {
- f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
- if (IS_ERR(f->hs_descriptors)) {
- ret = PTR_ERR(f->hs_descriptors);
- f->hs_descriptors = NULL;
- goto error;
- }
- }
- if (gadget_is_superspeed(c->cdev->gadget)) {
- f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER);
- if (IS_ERR(f->ss_descriptors)) {
- ret = PTR_ERR(f->ss_descriptors);
- f->ss_descriptors = NULL;
- goto error;
- }
- }
- /* Preallocate control endpoint request. */
- uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
- uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
- if (uvc->control_req == NULL || uvc->control_buf == NULL) {
- ret = -ENOMEM;
- goto error;
- }
- uvc->control_req->buf = uvc->control_buf;
- uvc->control_req->complete = uvc_function_ep0_complete;
- uvc->control_req->context = uvc;
- if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) {
- printk(KERN_INFO "v4l2_device_register failed\n");
- goto error;
- }
- /* Initialise video. */
- ret = uvcg_video_init(&uvc->video);
- if (ret < 0)
- goto error;
- /* Register a V4L2 device. */
- ret = uvc_register_video(uvc);
- if (ret < 0) {
- printk(KERN_INFO "Unable to register video device\n");
- goto error;
- }
- return 0;
- error:
- v4l2_device_unregister(&uvc->v4l2_dev);
- if (uvc->control_req)
- usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
- kfree(uvc->control_buf);
- usb_free_all_descriptors(f);
- return ret;
- }
- /* --------------------------------------------------------------------------
- * USB gadget function
- */
- static void uvc_free_inst(struct usb_function_instance *f)
- {
- struct f_uvc_opts *opts = fi_to_f_uvc_opts(f);
- mutex_destroy(&opts->lock);
- kfree(opts);
- }
- static struct usb_function_instance *uvc_alloc_inst(void)
- {
- struct f_uvc_opts *opts;
- struct uvc_camera_terminal_descriptor *cd;
- struct uvc_processing_unit_descriptor *pd;
- struct uvc_output_terminal_descriptor *od;
- struct uvc_color_matching_descriptor *md;
- struct uvc_descriptor_header **ctl_cls;
- opts = kzalloc(sizeof(*opts), GFP_KERNEL);
- if (!opts)
- return ERR_PTR(-ENOMEM);
- opts->func_inst.free_func_inst = uvc_free_inst;
- mutex_init(&opts->lock);
- cd = &opts->uvc_camera_terminal;
- cd->bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3);
- cd->bDescriptorType = USB_DT_CS_INTERFACE;
- cd->bDescriptorSubType = UVC_VC_INPUT_TERMINAL;
- cd->bTerminalID = 1;
- cd->wTerminalType = cpu_to_le16(0x0201);
- cd->bAssocTerminal = 0;
- cd->iTerminal = 0;
- cd->wObjectiveFocalLengthMin = cpu_to_le16(0);
- cd->wObjectiveFocalLengthMax = cpu_to_le16(0);
- cd->wOcularFocalLength = cpu_to_le16(0);
- cd->bControlSize = 3;
- cd->bmControls[0] = 2;
- cd->bmControls[1] = 0;
- cd->bmControls[2] = 0;
- pd = &opts->uvc_processing;
- pd->bLength = UVC_DT_PROCESSING_UNIT_SIZE(2);
- pd->bDescriptorType = USB_DT_CS_INTERFACE;
- pd->bDescriptorSubType = UVC_VC_PROCESSING_UNIT;
- pd->bUnitID = 2;
- pd->bSourceID = 1;
- pd->wMaxMultiplier = cpu_to_le16(16*1024);
- pd->bControlSize = 2;
- pd->bmControls[0] = 1;
- pd->bmControls[1] = 0;
- pd->iProcessing = 0;
- od = &opts->uvc_output_terminal;
- od->bLength = UVC_DT_OUTPUT_TERMINAL_SIZE;
- od->bDescriptorType = USB_DT_CS_INTERFACE;
- od->bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL;
- od->bTerminalID = 3;
- od->wTerminalType = cpu_to_le16(0x0101);
- od->bAssocTerminal = 0;
- od->bSourceID = 2;
- od->iTerminal = 0;
- md = &opts->uvc_color_matching;
- md->bLength = UVC_DT_COLOR_MATCHING_SIZE;
- md->bDescriptorType = USB_DT_CS_INTERFACE;
- md->bDescriptorSubType = UVC_VS_COLORFORMAT;
- md->bColorPrimaries = 1;
- md->bTransferCharacteristics = 1;
- md->bMatrixCoefficients = 4;
- /* Prepare fs control class descriptors for configfs-based gadgets */
- ctl_cls = opts->uvc_fs_control_cls;
- ctl_cls[0] = NULL; /* assigned elsewhere by configfs */
- ctl_cls[1] = (struct uvc_descriptor_header *)cd;
- ctl_cls[2] = (struct uvc_descriptor_header *)pd;
- ctl_cls[3] = (struct uvc_descriptor_header *)od;
- ctl_cls[4] = NULL; /* NULL-terminate */
- opts->fs_control =
- (const struct uvc_descriptor_header * const *)ctl_cls;
- /* Prepare hs control class descriptors for configfs-based gadgets */
- ctl_cls = opts->uvc_ss_control_cls;
- ctl_cls[0] = NULL; /* assigned elsewhere by configfs */
- ctl_cls[1] = (struct uvc_descriptor_header *)cd;
- ctl_cls[2] = (struct uvc_descriptor_header *)pd;
- ctl_cls[3] = (struct uvc_descriptor_header *)od;
- ctl_cls[4] = NULL; /* NULL-terminate */
- opts->ss_control =
- (const struct uvc_descriptor_header * const *)ctl_cls;
- opts->streaming_interval = 1;
- opts->streaming_maxpacket = 1024;
- uvcg_attach_configfs(opts);
- return &opts->func_inst;
- }
- static void uvc_free(struct usb_function *f)
- {
- struct uvc_device *uvc = to_uvc(f);
- struct f_uvc_opts *opts = container_of(f->fi, struct f_uvc_opts,
- func_inst);
- --opts->refcnt;
- kfree(uvc);
- }
- static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
- {
- struct usb_composite_dev *cdev = c->cdev;
- struct uvc_device *uvc = to_uvc(f);
- INFO(cdev, "%s\n", __func__);
- video_unregister_device(&uvc->vdev);
- v4l2_device_unregister(&uvc->v4l2_dev);
- usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
- kfree(uvc->control_buf);
- usb_free_all_descriptors(f);
- }
- static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
- {
- struct uvc_device *uvc;
- struct f_uvc_opts *opts;
- struct uvc_descriptor_header **strm_cls;
- uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
- if (uvc == NULL)
- return ERR_PTR(-ENOMEM);
- mutex_init(&uvc->video.mutex);
- uvc->state = UVC_STATE_DISCONNECTED;
- opts = fi_to_f_uvc_opts(fi);
- mutex_lock(&opts->lock);
- if (opts->uvc_fs_streaming_cls) {
- strm_cls = opts->uvc_fs_streaming_cls;
- opts->fs_streaming =
- (const struct uvc_descriptor_header * const *)strm_cls;
- }
- if (opts->uvc_hs_streaming_cls) {
- strm_cls = opts->uvc_hs_streaming_cls;
- opts->hs_streaming =
- (const struct uvc_descriptor_header * const *)strm_cls;
- }
- if (opts->uvc_ss_streaming_cls) {
- strm_cls = opts->uvc_ss_streaming_cls;
- opts->ss_streaming =
- (const struct uvc_descriptor_header * const *)strm_cls;
- }
- uvc->desc.fs_control = opts->fs_control;
- uvc->desc.ss_control = opts->ss_control;
- uvc->desc.fs_streaming = opts->fs_streaming;
- uvc->desc.hs_streaming = opts->hs_streaming;
- uvc->desc.ss_streaming = opts->ss_streaming;
- ++opts->refcnt;
- mutex_unlock(&opts->lock);
- /* Register the function. */
- uvc->func.name = "uvc";
- uvc->func.bind = uvc_function_bind;
- uvc->func.unbind = uvc_unbind;
- uvc->func.get_alt = uvc_function_get_alt;
- uvc->func.set_alt = uvc_function_set_alt;
- uvc->func.disable = uvc_function_disable;
- uvc->func.setup = uvc_function_setup;
- uvc->func.free_func = uvc_free;
- uvc->func.bind_deactivated = true;
- return &uvc->func;
- }
- DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Laurent Pinchart");
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