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958 lines
26 KiB
958 lines
26 KiB
// 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 ([email protected]) |
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*/ |
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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 "u_uvc.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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|
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/* string IDs are assigned dynamically */ |
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#define UVC_STRING_CONTROL_IDX 0 |
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#define UVC_STRING_STREAMING_IDX 1 |
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static struct usb_string uvc_en_us_strings[] = { |
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[UVC_STRING_CONTROL_IDX].s = "UVC Camera", |
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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 = 1, |
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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_control_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_control_comp = { |
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.bLength = sizeof(uvc_ss_control_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_control_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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/* 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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/* 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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/* 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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/* 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 = req->actual; |
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memcpy(&uvc_event->data.data, req->buf, req->actual); |
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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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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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/* 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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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) |
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{ |
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struct usb_composite_dev *cdev = uvc->func.config->cdev; |
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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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uvcg_info(f, "reset UVC Control\n"); |
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usb_ep_disable(uvc->control_ep); |
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if (!uvc->control_ep->desc) |
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if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep)) |
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return -EINVAL; |
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usb_ep_enable(uvc->control_ep); |
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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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if (uvc->video.ep) |
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usb_ep_disable(uvc->video.ep); |
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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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uvc->state = UVC_STATE_CONNECTED; |
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return 0; |
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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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usb_ep_disable(uvc->control_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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uvc->vdev.v4l2_dev = &uvc->v4l2_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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strlcpy(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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static struct usb_descriptor_header ** |
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uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed) |
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{ |
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struct uvc_input_header_descriptor *uvc_streaming_header; |
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struct uvc_header_descriptor *uvc_control_header; |
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const struct uvc_descriptor_header * const *uvc_control_desc; |
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const struct uvc_descriptor_header * const *uvc_streaming_cls; |
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const struct usb_descriptor_header * const *uvc_streaming_std; |
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const struct usb_descriptor_header * const *src; |
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struct usb_descriptor_header **dst; |
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struct usb_descriptor_header **hdr; |
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unsigned int control_size; |
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unsigned int streaming_size; |
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unsigned int n_desc; |
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unsigned int bytes; |
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void *mem; |
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switch (speed) { |
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case USB_SPEED_SUPER: |
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uvc_control_desc = uvc->desc.ss_control; |
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uvc_streaming_cls = uvc->desc.ss_streaming; |
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uvc_streaming_std = uvc_ss_streaming; |
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break; |
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case USB_SPEED_HIGH: |
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uvc_control_desc = uvc->desc.fs_control; |
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uvc_streaming_cls = uvc->desc.hs_streaming; |
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uvc_streaming_std = uvc_hs_streaming; |
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break; |
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case USB_SPEED_FULL: |
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default: |
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uvc_control_desc = uvc->desc.fs_control; |
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uvc_streaming_cls = uvc->desc.fs_streaming; |
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uvc_streaming_std = uvc_fs_streaming; |
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break; |
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} |
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if (!uvc_control_desc || !uvc_streaming_cls) |
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return ERR_PTR(-ENODEV); |
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|
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/* Descriptors layout |
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* |
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* uvc_iad |
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* uvc_control_intf |
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* Class-specific UVC control descriptors |
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* uvc_control_ep |
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* uvc_control_cs_ep |
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* uvc_ss_control_comp (for SS only) |
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* uvc_streaming_intf_alt0 |
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* Class-specific UVC streaming descriptors |
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* uvc_{fs|hs}_streaming |
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*/ |
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/* Count descriptors and compute their size. */ |
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control_size = 0; |
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streaming_size = 0; |
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bytes = uvc_iad.bLength + uvc_control_intf.bLength |
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+ uvc_control_ep.bLength + uvc_control_cs_ep.bLength |
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+ uvc_streaming_intf_alt0.bLength; |
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|
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if (speed == USB_SPEED_SUPER) { |
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bytes += uvc_ss_control_comp.bLength; |
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n_desc = 6; |
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} else { |
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n_desc = 5; |
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} |
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for (src = (const struct usb_descriptor_header **)uvc_control_desc; |
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*src; ++src) { |
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control_size += (*src)->bLength; |
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bytes += (*src)->bLength; |
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n_desc++; |
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} |
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for (src = (const struct usb_descriptor_header **)uvc_streaming_cls; |
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*src; ++src) { |
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streaming_size += (*src)->bLength; |
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bytes += (*src)->bLength; |
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n_desc++; |
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} |
|
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; |
|
|
|
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. */ |
|
ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); |
|
if (!ep) { |
|
uvcg_info(f, "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) { |
|
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; |
|
|
|
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; |
|
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; |
|
} |
|
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)) { |
|
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_color_matching_descriptor *md; |
|
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; |
|
|
|
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; |
|
|
|
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); |
|
--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); |
|
|
|
uvcg_info(f, "%s\n", __func__); |
|
|
|
device_remove_file(&uvc->vdev.dev, &dev_attr_function_name); |
|
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");
|
|
|