1123 lines
31 KiB
C
1123 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* uvc_gadget.c -- USB Video Class Gadget driver
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*
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* Copyright (C) 2009-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/g_uvc.h>
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#include <linux/usb/video.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-event.h>
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#include "uvc.h"
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#include "uvc_configfs.h"
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#include "uvc_v4l2.h"
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#include "uvc_video.h"
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unsigned int uvc_gadget_trace_param;
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module_param_named(trace, uvc_gadget_trace_param, uint, 0644);
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MODULE_PARM_DESC(trace, "Trace level bitmask");
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/* --------------------------------------------------------------------------
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* Function descriptors
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*/
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/* string IDs are assigned dynamically */
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static struct usb_string uvc_en_us_strings[] = {
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/* [UVC_STRING_CONTROL_IDX].s = DYNAMIC, */
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[UVC_STRING_STREAMING_IDX].s = "Video Streaming",
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{ }
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};
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static struct usb_gadget_strings uvc_stringtab = {
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.language = 0x0409, /* en-us */
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.strings = uvc_en_us_strings,
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};
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static struct usb_gadget_strings *uvc_function_strings[] = {
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&uvc_stringtab,
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NULL,
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};
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#define UVC_INTF_VIDEO_CONTROL 0
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#define UVC_INTF_VIDEO_STREAMING 1
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#define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */
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static struct usb_interface_assoc_descriptor uvc_iad = {
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.bLength = sizeof(uvc_iad),
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.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
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.bFirstInterface = 0,
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.bInterfaceCount = 2,
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.bFunctionClass = USB_CLASS_VIDEO,
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.bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
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.bFunctionProtocol = 0x00,
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.iFunction = 0,
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};
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static struct usb_interface_descriptor uvc_control_intf = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_endpoint_descriptor uvc_interrupt_ep = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_INT,
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.wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
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.bInterval = 8,
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};
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static struct usb_ss_ep_comp_descriptor uvc_ss_interrupt_comp = {
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.bLength = sizeof(uvc_ss_interrupt_comp),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* The following 3 values can be tweaked if necessary. */
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.bMaxBurst = 0,
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.bmAttributes = 0,
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.wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
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};
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static struct uvc_control_endpoint_descriptor uvc_interrupt_cs_ep = {
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.bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubType = UVC_EP_INTERRUPT,
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.wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
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};
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static struct usb_interface_descriptor uvc_streaming_intf_alt0 = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_interface_descriptor uvc_streaming_intf_alt1 = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
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.bAlternateSetting = 1,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_VIDEO,
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.bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
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.bInterfaceProtocol = 0x00,
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.iInterface = 0,
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};
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static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
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| USB_ENDPOINT_XFER_ISOC,
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/*
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* The wMaxPacketSize and bInterval values will be initialized from
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* module parameters.
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*/
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};
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static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
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| USB_ENDPOINT_XFER_ISOC,
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/*
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* The wMaxPacketSize and bInterval values will be initialized from
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* module parameters.
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*/
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};
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static struct usb_endpoint_descriptor uvc_ss_streaming_ep = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
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| USB_ENDPOINT_XFER_ISOC,
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/*
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* The wMaxPacketSize and bInterval values will be initialized from
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* module parameters.
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*/
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};
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static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
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.bLength = sizeof(uvc_ss_streaming_comp),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/*
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* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
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* initialized from module parameters.
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*/
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};
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static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
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(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
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(struct usb_descriptor_header *) &uvc_fs_streaming_ep,
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NULL,
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};
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static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
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(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
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(struct usb_descriptor_header *) &uvc_hs_streaming_ep,
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NULL,
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};
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static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
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(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
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(struct usb_descriptor_header *) &uvc_ss_streaming_ep,
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(struct usb_descriptor_header *) &uvc_ss_streaming_comp,
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NULL,
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};
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/* --------------------------------------------------------------------------
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* Control requests
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*/
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static void
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uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct uvc_device *uvc = req->context;
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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if (uvc->event_setup_out) {
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uvc->event_setup_out = 0;
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_DATA;
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uvc_event->data.length = min_t(unsigned int, req->actual,
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sizeof(uvc_event->data.data));
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memcpy(&uvc_event->data.data, req->buf, uvc_event->data.length);
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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}
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}
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static int
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uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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unsigned int interface = le16_to_cpu(ctrl->wIndex) & 0xff;
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struct usb_ctrlrequest *mctrl;
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if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
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uvcg_info(f, "invalid request type\n");
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return -EINVAL;
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}
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/* Stall too big requests. */
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if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
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return -EINVAL;
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/*
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* Tell the complete callback to generate an event for the next request
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* that will be enqueued by UVCIOC_SEND_RESPONSE.
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*/
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uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
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uvc->event_length = le16_to_cpu(ctrl->wLength);
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_SETUP;
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memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
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/* check for the interface number, fixup the interface number in
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* the ctrl request so the userspace doesn't have to bother with
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* offset and configfs parsing
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*/
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mctrl = &uvc_event->req;
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mctrl->wIndex &= ~cpu_to_le16(0xff);
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if (interface == uvc->streaming_intf)
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mctrl->wIndex = cpu_to_le16(UVC_STRING_STREAMING_IDX);
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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return 0;
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}
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void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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if (disable_ep && uvc->video.ep)
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usb_ep_disable(uvc->video.ep);
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usb_composite_setup_continue(cdev);
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}
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static int
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uvc_function_get_alt(struct usb_function *f, unsigned interface)
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{
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struct uvc_device *uvc = to_uvc(f);
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uvcg_info(f, "%s(%u)\n", __func__, interface);
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if (interface == uvc->control_intf)
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return 0;
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else if (interface != uvc->streaming_intf)
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return -EINVAL;
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else
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return uvc->video.ep->enabled ? 1 : 0;
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}
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static int
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uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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struct v4l2_event v4l2_event;
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struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
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int ret;
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uvcg_info(f, "%s(%u, %u)\n", __func__, interface, alt);
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if (interface == uvc->control_intf) {
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if (alt)
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return -EINVAL;
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if (uvc->enable_interrupt_ep) {
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uvcg_info(f, "reset UVC interrupt endpoint\n");
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usb_ep_disable(uvc->interrupt_ep);
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if (!uvc->interrupt_ep->desc)
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if (config_ep_by_speed(cdev->gadget, f,
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uvc->interrupt_ep))
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return -EINVAL;
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usb_ep_enable(uvc->interrupt_ep);
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}
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if (uvc->state == UVC_STATE_DISCONNECTED) {
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_CONNECT;
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uvc_event->speed = cdev->gadget->speed;
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_CONNECTED;
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}
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return 0;
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}
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if (interface != uvc->streaming_intf)
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return -EINVAL;
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/* TODO
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if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
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return alt ? -EINVAL : 0;
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*/
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switch (alt) {
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case 0:
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if (uvc->state != UVC_STATE_STREAMING)
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return 0;
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_STREAMOFF;
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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return USB_GADGET_DELAYED_STATUS;
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case 1:
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if (uvc->state != UVC_STATE_CONNECTED)
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return 0;
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if (!uvc->video.ep)
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return -EINVAL;
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uvcg_info(f, "reset UVC\n");
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usb_ep_disable(uvc->video.ep);
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ret = config_ep_by_speed(f->config->cdev->gadget,
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&(uvc->func), uvc->video.ep);
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if (ret)
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return ret;
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usb_ep_enable(uvc->video.ep);
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_STREAMON;
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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return USB_GADGET_DELAYED_STATUS;
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default:
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return -EINVAL;
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}
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}
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static void
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uvc_function_disable(struct usb_function *f)
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{
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struct uvc_device *uvc = to_uvc(f);
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struct v4l2_event v4l2_event;
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uvcg_info(f, "%s()\n", __func__);
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memset(&v4l2_event, 0, sizeof(v4l2_event));
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v4l2_event.type = UVC_EVENT_DISCONNECT;
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v4l2_event_queue(&uvc->vdev, &v4l2_event);
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uvc->state = UVC_STATE_DISCONNECTED;
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usb_ep_disable(uvc->video.ep);
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if (uvc->enable_interrupt_ep)
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usb_ep_disable(uvc->interrupt_ep);
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}
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/* --------------------------------------------------------------------------
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* Connection / disconnection
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*/
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void
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uvc_function_connect(struct uvc_device *uvc)
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{
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int ret;
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if ((ret = usb_function_activate(&uvc->func)) < 0)
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uvcg_info(&uvc->func, "UVC connect failed with %d\n", ret);
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}
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void
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uvc_function_disconnect(struct uvc_device *uvc)
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{
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int ret;
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if ((ret = usb_function_deactivate(&uvc->func)) < 0)
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uvcg_info(&uvc->func, "UVC disconnect failed with %d\n", ret);
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}
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/* --------------------------------------------------------------------------
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* USB probe and disconnect
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*/
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static ssize_t function_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uvc_device *uvc = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", uvc->func.fi->group.cg_item.ci_name);
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}
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static DEVICE_ATTR_RO(function_name);
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static int
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uvc_register_video(struct uvc_device *uvc)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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int ret;
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/* TODO reference counting. */
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memset(&uvc->vdev, 0, sizeof(uvc->vdev));
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uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
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uvc->vdev.v4l2_dev->dev = &cdev->gadget->dev;
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uvc->vdev.fops = &uvc_v4l2_fops;
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uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops;
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uvc->vdev.release = video_device_release_empty;
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uvc->vdev.vfl_dir = VFL_DIR_TX;
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uvc->vdev.lock = &uvc->video.mutex;
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uvc->vdev.device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
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strscpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
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video_set_drvdata(&uvc->vdev, uvc);
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ret = video_register_device(&uvc->vdev, VFL_TYPE_VIDEO, -1);
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if (ret < 0)
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return ret;
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ret = device_create_file(&uvc->vdev.dev, &dev_attr_function_name);
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if (ret < 0) {
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video_unregister_device(&uvc->vdev);
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return ret;
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}
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return 0;
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}
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#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
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do { \
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memcpy(mem, desc, (desc)->bLength); \
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*(dst)++ = mem; \
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mem += (desc)->bLength; \
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} while (0);
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#define UVC_COPY_DESCRIPTORS(mem, dst, src) \
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do { \
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const struct usb_descriptor_header * const *__src; \
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for (__src = src; *__src; ++__src) { \
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memcpy(mem, *__src, (*__src)->bLength); \
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*dst++ = mem; \
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mem += (*__src)->bLength; \
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} \
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} while (0)
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#define UVC_COPY_XU_DESCRIPTOR(mem, dst, desc) \
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do { \
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*(dst)++ = mem; \
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memcpy(mem, desc, 22); /* bLength to bNrInPins */ \
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mem += 22; \
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\
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memcpy(mem, (desc)->baSourceID, (desc)->bNrInPins); \
|
|
mem += (desc)->bNrInPins; \
|
|
\
|
|
memcpy(mem, &(desc)->bControlSize, 1); \
|
|
mem++; \
|
|
\
|
|
memcpy(mem, (desc)->bmControls, (desc)->bControlSize); \
|
|
mem += (desc)->bControlSize; \
|
|
\
|
|
memcpy(mem, &(desc)->iExtension, 1); \
|
|
mem++; \
|
|
} 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;
|
|
struct uvcg_extension *xu;
|
|
unsigned int control_size;
|
|
unsigned int streaming_size;
|
|
unsigned int n_desc;
|
|
unsigned int bytes;
|
|
void *mem;
|
|
|
|
switch (speed) {
|
|
case USB_SPEED_SUPER_PLUS:
|
|
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_interrupt_ep
|
|
* uvc_interrupt_cs_ep
|
|
* uvc_ss_interrupt_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_streaming_intf_alt0.bLength;
|
|
|
|
n_desc = 3;
|
|
if (uvc->enable_interrupt_ep) {
|
|
bytes += uvc_interrupt_ep.bLength + uvc_interrupt_cs_ep.bLength;
|
|
n_desc += 2;
|
|
|
|
if (speed == USB_SPEED_SUPER ||
|
|
speed == USB_SPEED_SUPER_PLUS) {
|
|
bytes += uvc_ss_interrupt_comp.bLength;
|
|
n_desc += 1;
|
|
}
|
|
}
|
|
|
|
for (src = (const struct usb_descriptor_header **)uvc_control_desc;
|
|
*src; ++src) {
|
|
control_size += (*src)->bLength;
|
|
bytes += (*src)->bLength;
|
|
n_desc++;
|
|
}
|
|
|
|
list_for_each_entry(xu, uvc->desc.extension_units, list) {
|
|
control_size += xu->desc.bLength;
|
|
bytes += xu->desc.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);
|
|
|
|
list_for_each_entry(xu, uvc->desc.extension_units, list)
|
|
UVC_COPY_XU_DESCRIPTOR(mem, dst, &xu->desc);
|
|
|
|
uvc_control_header->wTotalLength = cpu_to_le16(control_size);
|
|
uvc_control_header->bInCollection = 1;
|
|
uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
|
|
|
|
if (uvc->enable_interrupt_ep) {
|
|
UVC_COPY_DESCRIPTOR(mem, dst, &uvc_interrupt_ep);
|
|
if (speed == USB_SPEED_SUPER ||
|
|
speed == USB_SPEED_SUPER_PLUS)
|
|
UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_interrupt_comp);
|
|
|
|
UVC_COPY_DESCRIPTOR(mem, dst, &uvc_interrupt_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 uvcg_extension *xu;
|
|
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;
|
|
|
|
uvcg_info(f, "%s()\n", __func__);
|
|
|
|
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);
|
|
uvcg_info(f, "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));
|
|
|
|
/* A high-bandwidth endpoint must specify a bInterval value of 1 */
|
|
if (max_packet_mult > 1)
|
|
uvc_hs_streaming_ep.bInterval = 1;
|
|
else
|
|
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. */
|
|
if (opts->enable_interrupt_ep) {
|
|
ep = usb_ep_autoconfig(cdev->gadget, &uvc_interrupt_ep);
|
|
if (!ep) {
|
|
uvcg_info(f, "Unable to allocate interrupt EP\n");
|
|
goto error;
|
|
}
|
|
uvc->interrupt_ep = ep;
|
|
uvc_control_intf.bNumEndpoints = 1;
|
|
}
|
|
uvc->enable_interrupt_ep = opts->enable_interrupt_ep;
|
|
|
|
/*
|
|
* gadget_is_{super|dual}speed() API check UDC controller capitblity. It should pass down
|
|
* highest speed endpoint descriptor to UDC controller. So UDC controller driver can reserve
|
|
* enough resource at check_config(), especially mult and maxburst. So UDC driver (such as
|
|
* cdns3) can know need at least (mult + 1) * (maxburst + 1) * wMaxPacketSize internal
|
|
* memory for this uvc functions. This is the only straightforward method to resolve the UDC
|
|
* resource allocation issue in the current gadget framework.
|
|
*/
|
|
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) {
|
|
uvcg_info(f, "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;
|
|
|
|
/*
|
|
* XUs can have an arbitrary string descriptor describing them. If they
|
|
* have one pick up the ID.
|
|
*/
|
|
list_for_each_entry(xu, &opts->extension_units, list)
|
|
if (xu->string_descriptor_index)
|
|
xu->desc.iExtension = cdev->usb_strings[xu->string_descriptor_index].id;
|
|
|
|
/*
|
|
* We attach the hard-coded defaults incase the user does not provide
|
|
* any more appropriate strings through configfs.
|
|
*/
|
|
uvc_en_us_strings[UVC_STRING_CONTROL_IDX].s = opts->function_name;
|
|
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 = opts->iad_index ? cdev->usb_strings[opts->iad_index].id :
|
|
us[UVC_STRING_CONTROL_IDX].id;
|
|
uvc_streaming_intf_alt0.iInterface = opts->vs0_index ?
|
|
cdev->usb_strings[opts->vs0_index].id :
|
|
us[UVC_STRING_STREAMING_IDX].id;
|
|
uvc_streaming_intf_alt1.iInterface = opts->vs1_index ?
|
|
cdev->usb_strings[opts->vs1_index].id :
|
|
us[UVC_STRING_STREAMING_IDX].id;
|
|
|
|
/* 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;
|
|
opts->control_interface = 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;
|
|
opts->streaming_interface = 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
f->ssp_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER_PLUS);
|
|
if (IS_ERR(f->ssp_descriptors)) {
|
|
ret = PTR_ERR(f->ssp_descriptors);
|
|
f->ssp_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)) {
|
|
uvcg_err(f, "failed to register V4L2 device\n");
|
|
goto error;
|
|
}
|
|
|
|
/* Initialise video. */
|
|
ret = uvcg_video_init(&uvc->video, uvc);
|
|
if (ret < 0)
|
|
goto v4l2_error;
|
|
|
|
/* Register a V4L2 device. */
|
|
ret = uvc_register_video(uvc);
|
|
if (ret < 0) {
|
|
uvcg_err(f, "failed to register video device\n");
|
|
goto v4l2_error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
v4l2_error:
|
|
v4l2_device_unregister(&uvc->v4l2_dev);
|
|
error:
|
|
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_descriptor_header **ctl_cls;
|
|
int ret;
|
|
|
|
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;
|
|
pd->bmVideoStandards = 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;
|
|
|
|
/*
|
|
* With the ability to add XUs to the UVC function graph, we need to be
|
|
* able to allocate unique unit IDs to them. The IDs are 1-based, with
|
|
* the CT, PU and OT above consuming the first 3.
|
|
*/
|
|
opts->last_unit_id = 3;
|
|
|
|
/* 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;
|
|
|
|
INIT_LIST_HEAD(&opts->extension_units);
|
|
|
|
opts->streaming_interval = 1;
|
|
opts->streaming_maxpacket = 1024;
|
|
snprintf(opts->function_name, sizeof(opts->function_name), "UVC Camera");
|
|
|
|
ret = uvcg_attach_configfs(opts);
|
|
if (ret < 0) {
|
|
kfree(opts);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
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);
|
|
if (!opts->header)
|
|
config_item_put(&uvc->header->item);
|
|
--opts->refcnt;
|
|
kfree(uvc);
|
|
}
|
|
|
|
static void uvc_function_unbind(struct usb_configuration *c,
|
|
struct usb_function *f)
|
|
{
|
|
struct usb_composite_dev *cdev = c->cdev;
|
|
struct uvc_device *uvc = to_uvc(f);
|
|
struct uvc_video *video = &uvc->video;
|
|
long wait_ret = 1;
|
|
|
|
uvcg_info(f, "%s()\n", __func__);
|
|
|
|
if (video->async_wq)
|
|
destroy_workqueue(video->async_wq);
|
|
|
|
/*
|
|
* If we know we're connected via v4l2, then there should be a cleanup
|
|
* of the device from userspace either via UVC_EVENT_DISCONNECT or
|
|
* though the video device removal uevent. Allow some time for the
|
|
* application to close out before things get deleted.
|
|
*/
|
|
if (uvc->func_connected) {
|
|
uvcg_dbg(f, "waiting for clean disconnect\n");
|
|
wait_ret = wait_event_interruptible_timeout(uvc->func_connected_queue,
|
|
uvc->func_connected == false, msecs_to_jiffies(500));
|
|
uvcg_dbg(f, "done waiting with ret: %ld\n", wait_ret);
|
|
}
|
|
|
|
device_remove_file(&uvc->vdev.dev, &dev_attr_function_name);
|
|
video_unregister_device(&uvc->vdev);
|
|
v4l2_device_unregister(&uvc->v4l2_dev);
|
|
|
|
if (uvc->func_connected) {
|
|
/*
|
|
* Wait for the release to occur to ensure there are no longer any
|
|
* pending operations that may cause panics when resources are cleaned
|
|
* up.
|
|
*/
|
|
uvcg_warn(f, "%s no clean disconnect, wait for release\n", __func__);
|
|
wait_ret = wait_event_interruptible_timeout(uvc->func_connected_queue,
|
|
uvc->func_connected == false, msecs_to_jiffies(1000));
|
|
uvcg_dbg(f, "done waiting for release with ret: %ld\n", wait_ret);
|
|
}
|
|
|
|
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;
|
|
struct config_item *streaming, *header, *h;
|
|
|
|
uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
|
|
if (uvc == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_init(&uvc->video.mutex);
|
|
uvc->state = UVC_STATE_DISCONNECTED;
|
|
init_waitqueue_head(&uvc->func_connected_queue);
|
|
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;
|
|
|
|
if (opts->header) {
|
|
uvc->header = opts->header;
|
|
} else {
|
|
streaming = config_group_find_item(&opts->func_inst.group, "streaming");
|
|
if (!streaming)
|
|
goto err_config;
|
|
|
|
header = config_group_find_item(to_config_group(streaming), "header");
|
|
config_item_put(streaming);
|
|
if (!header)
|
|
goto err_config;
|
|
|
|
h = config_group_find_item(to_config_group(header), "h");
|
|
config_item_put(header);
|
|
if (!h)
|
|
goto err_config;
|
|
|
|
uvc->header = to_uvcg_streaming_header(h);
|
|
if (!uvc->header->linked) {
|
|
mutex_unlock(&opts->lock);
|
|
kfree(uvc);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
}
|
|
|
|
uvc->desc.extension_units = &opts->extension_units;
|
|
|
|
++opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
|
|
/* Register the function. */
|
|
uvc->func.name = "uvc";
|
|
uvc->func.bind = uvc_function_bind;
|
|
uvc->func.unbind = uvc_function_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;
|
|
|
|
err_config:
|
|
mutex_unlock(&opts->lock);
|
|
kfree(uvc);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Laurent Pinchart");
|