432 lines
13 KiB
C
Executable file
432 lines
13 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0+
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/*
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* webcam.c -- USB webcam 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/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/usb/video.h>
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#include "u_uvc.h"
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USB_GADGET_COMPOSITE_OPTIONS();
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/*-------------------------------------------------------------------------*/
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/* module parameters specific to the Video streaming endpoint */
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static unsigned int streaming_interval = 1;
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module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(streaming_interval, "1 - 16");
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static unsigned int streaming_maxpacket = 1024;
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module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
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static unsigned int streaming_maxburst;
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module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
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/* --------------------------------------------------------------------------
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* Device descriptor
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*/
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#define WEBCAM_VENDOR_ID 0x1d6b /* Linux Foundation */
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#define WEBCAM_PRODUCT_ID 0x0102 /* Webcam A/V gadget */
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#define WEBCAM_DEVICE_BCD 0x0010 /* 0.10 */
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static char webcam_vendor_label[] = "Linux Foundation";
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static char webcam_product_label[] = "Webcam gadget";
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static char webcam_config_label[] = "Video";
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/* string IDs are assigned dynamically */
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#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
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static struct usb_string webcam_strings[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = webcam_vendor_label,
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[USB_GADGET_PRODUCT_IDX].s = webcam_product_label,
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[USB_GADGET_SERIAL_IDX].s = "",
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[STRING_DESCRIPTION_IDX].s = webcam_config_label,
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{ }
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};
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static struct usb_gadget_strings webcam_stringtab = {
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.language = 0x0409, /* en-us */
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.strings = webcam_strings,
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};
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static struct usb_gadget_strings *webcam_device_strings[] = {
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&webcam_stringtab,
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NULL,
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};
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static struct usb_function_instance *fi_uvc;
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static struct usb_function *f_uvc;
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static struct usb_device_descriptor webcam_device_descriptor = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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/* .bcdUSB = DYNAMIC */
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.bDeviceClass = USB_CLASS_MISC,
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.bDeviceSubClass = 0x02,
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.bDeviceProtocol = 0x01,
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.bMaxPacketSize0 = 0, /* dynamic */
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.idVendor = cpu_to_le16(WEBCAM_VENDOR_ID),
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.idProduct = cpu_to_le16(WEBCAM_PRODUCT_ID),
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.bcdDevice = cpu_to_le16(WEBCAM_DEVICE_BCD),
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.iManufacturer = 0, /* dynamic */
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.iProduct = 0, /* dynamic */
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.iSerialNumber = 0, /* dynamic */
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.bNumConfigurations = 0, /* dynamic */
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};
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DECLARE_UVC_HEADER_DESCRIPTOR(1);
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static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
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.bLength = UVC_DT_HEADER_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VC_HEADER,
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.bcdUVC = cpu_to_le16(0x0100),
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.wTotalLength = 0, /* dynamic */
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.dwClockFrequency = cpu_to_le32(48000000),
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.bInCollection = 0, /* dynamic */
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.baInterfaceNr[0] = 0, /* dynamic */
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};
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static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
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.bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VC_INPUT_TERMINAL,
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.bTerminalID = 1,
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.wTerminalType = cpu_to_le16(0x0201),
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.bAssocTerminal = 0,
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.iTerminal = 0,
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.wObjectiveFocalLengthMin = cpu_to_le16(0),
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.wObjectiveFocalLengthMax = cpu_to_le16(0),
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.wOcularFocalLength = cpu_to_le16(0),
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.bControlSize = 3,
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.bmControls[0] = 2,
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.bmControls[1] = 0,
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.bmControls[2] = 0,
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};
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static const struct uvc_processing_unit_descriptor uvc_processing = {
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.bLength = UVC_DT_PROCESSING_UNIT_SIZE(2),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VC_PROCESSING_UNIT,
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.bUnitID = 2,
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.bSourceID = 1,
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.wMaxMultiplier = cpu_to_le16(16*1024),
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.bControlSize = 2,
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.bmControls[0] = 1,
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.bmControls[1] = 0,
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.iProcessing = 0,
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};
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static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
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.bLength = UVC_DT_OUTPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL,
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.bTerminalID = 3,
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.wTerminalType = cpu_to_le16(0x0101),
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.bAssocTerminal = 0,
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.bSourceID = 2,
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.iTerminal = 0,
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};
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DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);
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static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
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.bLength = UVC_DT_INPUT_HEADER_SIZE(1, 2),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_INPUT_HEADER,
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.bNumFormats = 2,
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.wTotalLength = 0, /* dynamic */
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.bEndpointAddress = 0, /* dynamic */
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.bmInfo = 0,
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.bTerminalLink = 3,
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.bStillCaptureMethod = 0,
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.bTriggerSupport = 0,
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.bTriggerUsage = 0,
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.bControlSize = 1,
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.bmaControls[0][0] = 0,
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.bmaControls[1][0] = 4,
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};
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static const struct uvc_format_uncompressed uvc_format_yuv = {
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.bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FORMAT_UNCOMPRESSED,
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.bFormatIndex = 1,
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.bNumFrameDescriptors = 2,
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.guidFormat =
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{ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
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0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
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.bBitsPerPixel = 16,
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.bDefaultFrameIndex = 1,
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.bAspectRatioX = 0,
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.bAspectRatioY = 0,
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.bmInterfaceFlags = 0,
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.bCopyProtect = 0,
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};
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DECLARE_UVC_FRAME_UNCOMPRESSED(1);
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DECLARE_UVC_FRAME_UNCOMPRESSED(3);
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static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
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.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FRAME_UNCOMPRESSED,
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.bFrameIndex = 1,
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.bmCapabilities = 0,
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.wWidth = cpu_to_le16(640),
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.wHeight = cpu_to_le16(360),
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.dwMinBitRate = cpu_to_le32(18432000),
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.dwMaxBitRate = cpu_to_le32(55296000),
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.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
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.dwDefaultFrameInterval = cpu_to_le32(666666),
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.bFrameIntervalType = 3,
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.dwFrameInterval[0] = cpu_to_le32(666666),
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.dwFrameInterval[1] = cpu_to_le32(1000000),
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.dwFrameInterval[2] = cpu_to_le32(5000000),
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};
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static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
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.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FRAME_UNCOMPRESSED,
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.bFrameIndex = 2,
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.bmCapabilities = 0,
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.wWidth = cpu_to_le16(1280),
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.wHeight = cpu_to_le16(720),
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.dwMinBitRate = cpu_to_le32(29491200),
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.dwMaxBitRate = cpu_to_le32(29491200),
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.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
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.dwDefaultFrameInterval = cpu_to_le32(5000000),
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.bFrameIntervalType = 1,
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.dwFrameInterval[0] = cpu_to_le32(5000000),
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};
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static const struct uvc_format_mjpeg uvc_format_mjpg = {
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.bLength = UVC_DT_FORMAT_MJPEG_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FORMAT_MJPEG,
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.bFormatIndex = 2,
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.bNumFrameDescriptors = 2,
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.bmFlags = 0,
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.bDefaultFrameIndex = 1,
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.bAspectRatioX = 0,
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.bAspectRatioY = 0,
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.bmInterfaceFlags = 0,
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.bCopyProtect = 0,
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};
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DECLARE_UVC_FRAME_MJPEG(1);
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DECLARE_UVC_FRAME_MJPEG(3);
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static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
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.bLength = UVC_DT_FRAME_MJPEG_SIZE(3),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FRAME_MJPEG,
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.bFrameIndex = 1,
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.bmCapabilities = 0,
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.wWidth = cpu_to_le16(640),
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.wHeight = cpu_to_le16(360),
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.dwMinBitRate = cpu_to_le32(18432000),
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.dwMaxBitRate = cpu_to_le32(55296000),
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.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
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.dwDefaultFrameInterval = cpu_to_le32(666666),
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.bFrameIntervalType = 3,
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.dwFrameInterval[0] = cpu_to_le32(666666),
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.dwFrameInterval[1] = cpu_to_le32(1000000),
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.dwFrameInterval[2] = cpu_to_le32(5000000),
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};
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static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
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.bLength = UVC_DT_FRAME_MJPEG_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_FRAME_MJPEG,
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.bFrameIndex = 2,
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.bmCapabilities = 0,
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.wWidth = cpu_to_le16(1280),
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.wHeight = cpu_to_le16(720),
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.dwMinBitRate = cpu_to_le32(29491200),
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.dwMaxBitRate = cpu_to_le32(29491200),
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.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
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.dwDefaultFrameInterval = cpu_to_le32(5000000),
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.bFrameIntervalType = 1,
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.dwFrameInterval[0] = cpu_to_le32(5000000),
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};
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static const struct uvc_color_matching_descriptor uvc_color_matching = {
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.bLength = UVC_DT_COLOR_MATCHING_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = UVC_VS_COLORFORMAT,
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.bColorPrimaries = 1,
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.bTransferCharacteristics = 1,
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.bMatrixCoefficients = 4,
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};
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static const struct uvc_descriptor_header * const uvc_fs_control_cls[] = {
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(const struct uvc_descriptor_header *) &uvc_control_header,
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(const struct uvc_descriptor_header *) &uvc_camera_terminal,
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(const struct uvc_descriptor_header *) &uvc_processing,
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(const struct uvc_descriptor_header *) &uvc_output_terminal,
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NULL,
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};
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static const struct uvc_descriptor_header * const uvc_ss_control_cls[] = {
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(const struct uvc_descriptor_header *) &uvc_control_header,
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(const struct uvc_descriptor_header *) &uvc_camera_terminal,
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(const struct uvc_descriptor_header *) &uvc_processing,
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(const struct uvc_descriptor_header *) &uvc_output_terminal,
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NULL,
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};
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static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
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(const struct uvc_descriptor_header *) &uvc_input_header,
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(const struct uvc_descriptor_header *) &uvc_format_yuv,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
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(const struct uvc_descriptor_header *) &uvc_format_mjpg,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
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(const struct uvc_descriptor_header *) &uvc_color_matching,
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NULL,
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};
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static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
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(const struct uvc_descriptor_header *) &uvc_input_header,
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(const struct uvc_descriptor_header *) &uvc_format_yuv,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
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(const struct uvc_descriptor_header *) &uvc_format_mjpg,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
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(const struct uvc_descriptor_header *) &uvc_color_matching,
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NULL,
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};
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static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
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(const struct uvc_descriptor_header *) &uvc_input_header,
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(const struct uvc_descriptor_header *) &uvc_format_yuv,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
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(const struct uvc_descriptor_header *) &uvc_format_mjpg,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
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(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
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(const struct uvc_descriptor_header *) &uvc_color_matching,
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NULL,
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};
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/* --------------------------------------------------------------------------
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* USB configuration
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*/
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static int
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webcam_config_bind(struct usb_configuration *c)
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{
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int status = 0;
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f_uvc = usb_get_function(fi_uvc);
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if (IS_ERR(f_uvc))
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return PTR_ERR(f_uvc);
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status = usb_add_function(c, f_uvc);
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if (status < 0)
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usb_put_function(f_uvc);
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return status;
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}
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static struct usb_configuration webcam_config_driver = {
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.label = webcam_config_label,
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.bConfigurationValue = 1,
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.iConfiguration = 0, /* dynamic */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW,
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};
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static int
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webcam_unbind(struct usb_composite_dev *cdev)
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{
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if (!IS_ERR_OR_NULL(f_uvc))
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usb_put_function(f_uvc);
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if (!IS_ERR_OR_NULL(fi_uvc))
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usb_put_function_instance(fi_uvc);
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return 0;
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}
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static int
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webcam_bind(struct usb_composite_dev *cdev)
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{
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struct f_uvc_opts *uvc_opts;
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int ret;
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fi_uvc = usb_get_function_instance("uvc");
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if (IS_ERR(fi_uvc))
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return PTR_ERR(fi_uvc);
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uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);
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uvc_opts->streaming_interval = streaming_interval;
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uvc_opts->streaming_maxpacket = streaming_maxpacket;
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uvc_opts->streaming_maxburst = streaming_maxburst;
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uvc_opts->fs_control = uvc_fs_control_cls;
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uvc_opts->ss_control = uvc_ss_control_cls;
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uvc_opts->fs_streaming = uvc_fs_streaming_cls;
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uvc_opts->hs_streaming = uvc_hs_streaming_cls;
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uvc_opts->ss_streaming = uvc_ss_streaming_cls;
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/* Allocate string descriptor numbers ... note that string contents
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* can be overridden by the composite_dev glue.
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*/
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ret = usb_string_ids_tab(cdev, webcam_strings);
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if (ret < 0)
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goto error;
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webcam_device_descriptor.iManufacturer =
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webcam_strings[USB_GADGET_MANUFACTURER_IDX].id;
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webcam_device_descriptor.iProduct =
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webcam_strings[USB_GADGET_PRODUCT_IDX].id;
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webcam_config_driver.iConfiguration =
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webcam_strings[STRING_DESCRIPTION_IDX].id;
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/* Register our configuration. */
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if ((ret = usb_add_config(cdev, &webcam_config_driver,
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webcam_config_bind)) < 0)
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goto error;
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usb_composite_overwrite_options(cdev, &coverwrite);
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INFO(cdev, "Webcam Video Gadget\n");
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return 0;
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error:
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usb_put_function_instance(fi_uvc);
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return ret;
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}
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/* --------------------------------------------------------------------------
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* Driver
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*/
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static struct usb_composite_driver webcam_driver = {
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.name = "g_webcam",
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.dev = &webcam_device_descriptor,
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.strings = webcam_device_strings,
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.max_speed = USB_SPEED_SUPER,
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.bind = webcam_bind,
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.unbind = webcam_unbind,
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};
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module_usb_composite_driver(webcam_driver);
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MODULE_AUTHOR("Laurent Pinchart");
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MODULE_DESCRIPTION("Webcam Video Gadget");
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MODULE_LICENSE("GPL");
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