| /* |
| * 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->driver_data ? 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; |
| |
| if (uvc->control_ep->driver_data) { |
| INFO(cdev, "reset UVC Control\n"); |
| usb_ep_disable(uvc->control_ep); |
| uvc->control_ep->driver_data = NULL; |
| } |
| |
| if (!uvc->control_ep->desc) |
| if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep)) |
| return -EINVAL; |
| |
| usb_ep_enable(uvc->control_ep); |
| uvc->control_ep->driver_data = uvc; |
| |
| 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); |
| uvc->video.ep->driver_data = NULL; |
| } |
| |
| 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; |
| |
| if (uvc->video.ep->driver_data) { |
| INFO(cdev, "reset UVC\n"); |
| usb_ep_disable(uvc->video.ep); |
| uvc->video.ep->driver_data = NULL; |
| } |
| |
| ret = config_ep_by_speed(f->config->cdev->gadget, |
| &(uvc->func), uvc->video.ep); |
| if (ret) |
| return ret; |
| usb_ep_enable(uvc->video.ep); |
| uvc->video.ep->driver_data = uvc; |
| |
| 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; |
| |
| if (uvc->video.ep->driver_data) { |
| usb_ep_disable(uvc->video.ep); |
| uvc->video.ep->driver_data = NULL; |
| } |
| |
| if (uvc->control_ep->driver_data) { |
| usb_ep_disable(uvc->control_ep); |
| uvc->control_ep->driver_data = NULL; |
| } |
| } |
| |
| /* -------------------------------------------------------------------------- |
| * 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); |
| |
| /* 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); |
| |
| /* 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; |
| ep->driver_data = uvc; |
| |
| 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; |
| ep->driver_data = uvc; |
| |
| 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_ep) |
| uvc->control_ep->driver_data = NULL; |
| if (uvc->video.ep) |
| uvc->video.ep->driver_data = NULL; |
| |
| 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); |
| uvc->control_ep->driver_data = NULL; |
| uvc->video.ep->driver_data = NULL; |
| |
| 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"); |