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USB gadget: Webcam device

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This webcam gadget instantiates a UVC camera (360p and 720p resolutions
in YUYV and MJPEG).

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
tirimbino
Laurent Pinchart 15 years ago committed by Greg Kroah-Hartman
parent cdda479f15
commit a9914127e8
3 changed files with 409 additions and 1 deletions
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  1. 9
      drivers/usb/gadget/Kconfig
  2. 2
      drivers/usb/gadget/Makefile
  3. 399
      drivers/usb/gadget/webcam.c

9
drivers/usb/gadget/Kconfig
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@ -877,8 +877,15 @@ config USB_G_HID
# put drivers that need isochronous transfer support (for audio
# or video class gadget drivers), or specific hardware, here.
config USB_G_WEBCAM
tristate "USB Webcam Gadget"
help
The Webcam Gadget acts as a composite USB Audio and Video Class
device. It provides a userspace API to process UVC control requests
and stream video data to the host.
# - none yet
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_webcam".
endchoice

2
drivers/usb/gadget/Makefile
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@ -45,6 +45,7 @@ g_cdc-objs := cdc2.o
g_multi-objs := multi.o
g_hid-objs := hid.o
g_nokia-objs := nokia.o
g_webcam-objs := webcam.o
obj-$(CONFIG_USB_ZERO) += g_zero.o
obj-$(CONFIG_USB_AUDIO) += g_audio.o
@ -59,4 +60,5 @@ obj-$(CONFIG_USB_CDC_COMPOSITE) += g_cdc.o
obj-$(CONFIG_USB_G_HID) += g_hid.o
obj-$(CONFIG_USB_G_MULTI) += g_multi.o
obj-$(CONFIG_USB_G_NOKIA) += g_nokia.o
obj-$(CONFIG_USB_G_WEBCAM) += g_webcam.o

399
drivers/usb/gadget/webcam.c
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@ -0,0 +1,399 @@
/*
* webcam.c -- USB webcam gadget driver
*
* Copyright (C) 2009-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/usb/video.h>
#include "f_uvc.h"
/*
* Kbuild is not very cooperative with respect to linking separately
* compiled library objects into one module. So for now we won't use
* separate compilation ... ensuring init/exit sections work to shrink
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#include "composite.c"
#include "usbstring.c"
#include "config.c"
#include "epautoconf.c"
#include "f_uvc.c"
#include "uvc_queue.c"
#include "uvc_v4l2.c"
#include "uvc_video.c"
/* --------------------------------------------------------------------------
* Device descriptor
*/
#define WEBCAM_VENDOR_ID 0x1d6b /* Linux Foundation */
#define WEBCAM_PRODUCT_ID 0x0102 /* Webcam A/V gadget */
#define WEBCAM_DEVICE_BCD 0x0010 /* 0.10 */
static char webcam_vendor_label[] = "Linux Foundation";
static char webcam_product_label[] = "Webcam gadget";
static char webcam_config_label[] = "Video";
/* string IDs are assigned dynamically */
#define STRING_MANUFACTURER_IDX 0
#define STRING_PRODUCT_IDX 1
#define STRING_DESCRIPTION_IDX 2
static struct usb_string webcam_strings[] = {
[STRING_MANUFACTURER_IDX].s = webcam_vendor_label,
[STRING_PRODUCT_IDX].s = webcam_product_label,
[STRING_DESCRIPTION_IDX].s = webcam_config_label,
{ }
};
static struct usb_gadget_strings webcam_stringtab = {
.language = 0x0409, /* en-us */
.strings = webcam_strings,
};
static struct usb_gadget_strings *webcam_device_strings[] = {
&webcam_stringtab,
NULL,
};
static struct usb_device_descriptor webcam_device_descriptor = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_MISC,
.bDeviceSubClass = 0x02,
.bDeviceProtocol = 0x01,
.bMaxPacketSize0 = 0, /* dynamic */
.idVendor = cpu_to_le16(WEBCAM_VENDOR_ID),
.idProduct = cpu_to_le16(WEBCAM_PRODUCT_ID),
.bcdDevice = cpu_to_le16(WEBCAM_DEVICE_BCD),
.iManufacturer = 0, /* dynamic */
.iProduct = 0, /* dynamic */
.iSerialNumber = 0, /* dynamic */
.bNumConfigurations = 0, /* dynamic */
};
DECLARE_UVC_HEADER_DESCRIPTOR(1);
static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
.bLength = UVC_DT_HEADER_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_HEADER,
.bcdUVC = cpu_to_le16(0x0100),
.wTotalLength = 0, /* dynamic */
.dwClockFrequency = cpu_to_le32(48000000),
.bInCollection = 0, /* dynamic */
.baInterfaceNr[0] = 0, /* dynamic */
};
static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
.bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_INPUT_TERMINAL,
.bTerminalID = 1,
.wTerminalType = cpu_to_le16(0x0201),
.bAssocTerminal = 0,
.iTerminal = 0,
.wObjectiveFocalLengthMin = cpu_to_le16(0),
.wObjectiveFocalLengthMax = cpu_to_le16(0),
.wOcularFocalLength = cpu_to_le16(0),
.bControlSize = 3,
.bmControls[0] = 2,
.bmControls[1] = 0,
.bmControls[2] = 0,
};
static const struct uvc_processing_unit_descriptor uvc_processing = {
.bLength = UVC_DT_PROCESSING_UNIT_SIZE(2),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_PROCESSING_UNIT,
.bUnitID = 2,
.bSourceID = 1,
.wMaxMultiplier = cpu_to_le16(16*1024),
.bControlSize = 2,
.bmControls[0] = 1,
.bmControls[1] = 0,
.iProcessing = 0,
};
static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
.bLength = UVC_DT_OUTPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_OUTPUT_TERMINAL,
.bTerminalID = 3,
.wTerminalType = cpu_to_le16(0x0101),
.bAssocTerminal = 0,
.bSourceID = 2,
.iTerminal = 0,
};
DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);
static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
.bLength = UVC_DT_INPUT_HEADER_SIZE(1, 2),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_INPUT_HEADER,
.bNumFormats = 2,
.wTotalLength = 0, /* dynamic */
.bEndpointAddress = 0, /* dynamic */
.bmInfo = 0,
.bTerminalLink = 3,
.bStillCaptureMethod = 0,
.bTriggerSupport = 0,
.bTriggerUsage = 0,
.bControlSize = 1,
.bmaControls[0][0] = 0,
.bmaControls[1][0] = 4,
};
static const struct uvc_format_uncompressed uvc_format_yuv = {
.bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FORMAT_UNCOMPRESSED,
.bFormatIndex = 1,
.bNumFrameDescriptors = 2,
.guidFormat =
{ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
.bBitsPerPixel = 16,
.bDefaultFrameIndex = 1,
.bAspectRatioX = 0,
.bAspectRatioY = 0,
.bmInterfaceFlags = 0,
.bCopyProtect = 0,
};
DECLARE_UVC_FRAME_UNCOMPRESSED(1);
DECLARE_UVC_FRAME_UNCOMPRESSED(3);
static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FRAME_UNCOMPRESSED,
.bFrameIndex = 1,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(640),
.wHeight = cpu_to_le16(360),
.dwMinBitRate = cpu_to_le32(18432000),
.dwMaxBitRate = cpu_to_le32(55296000),
.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
.dwDefaultFrameInterval = cpu_to_le32(666666),
.bFrameIntervalType = 3,
.dwFrameInterval[0] = cpu_to_le32(666666),
.dwFrameInterval[1] = cpu_to_le32(1000000),
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FRAME_UNCOMPRESSED,
.bFrameIndex = 2,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(1280),
.wHeight = cpu_to_le16(720),
.dwMinBitRate = cpu_to_le32(29491200),
.dwMaxBitRate = cpu_to_le32(29491200),
.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
.dwDefaultFrameInterval = cpu_to_le32(5000000),
.bFrameIntervalType = 1,
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
static const struct uvc_format_mjpeg uvc_format_mjpg = {
.bLength = UVC_DT_FORMAT_MJPEG_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FORMAT_MJPEG,
.bFormatIndex = 2,
.bNumFrameDescriptors = 2,
.bmFlags = 0,
.bDefaultFrameIndex = 1,
.bAspectRatioX = 0,
.bAspectRatioY = 0,
.bmInterfaceFlags = 0,
.bCopyProtect = 0,
};
DECLARE_UVC_FRAME_MJPEG(1);
DECLARE_UVC_FRAME_MJPEG(3);
static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
.bLength = UVC_DT_FRAME_MJPEG_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FRAME_MJPEG,
.bFrameIndex = 1,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(640),
.wHeight = cpu_to_le16(360),
.dwMinBitRate = cpu_to_le32(18432000),
.dwMaxBitRate = cpu_to_le32(55296000),
.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
.dwDefaultFrameInterval = cpu_to_le32(666666),
.bFrameIntervalType = 3,
.dwFrameInterval[0] = cpu_to_le32(666666),
.dwFrameInterval[1] = cpu_to_le32(1000000),
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
.bLength = UVC_DT_FRAME_MJPEG_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_FRAME_MJPEG,
.bFrameIndex = 2,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(1280),
.wHeight = cpu_to_le16(720),
.dwMinBitRate = cpu_to_le32(29491200),
.dwMaxBitRate = cpu_to_le32(29491200),
.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
.dwDefaultFrameInterval = cpu_to_le32(5000000),
.bFrameIntervalType = 1,
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
static const struct uvc_color_matching_descriptor uvc_color_matching = {
.bLength = UVC_DT_COLOR_MATCHING_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_DT_COLOR_MATCHING,
.bColorPrimaries = 1,
.bTransferCharacteristics = 1,
.bMatrixCoefficients = 4,
};
static const struct uvc_descriptor_header * const uvc_control_cls[] = {
(const struct uvc_descriptor_header *) &uvc_control_header,
(const struct uvc_descriptor_header *) &uvc_camera_terminal,
(const struct uvc_descriptor_header *) &uvc_processing,
(const struct uvc_descriptor_header *) &uvc_output_terminal,
NULL,
};
static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
(const struct uvc_descriptor_header *) &uvc_format_yuv,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
(const struct uvc_descriptor_header *) &uvc_format_mjpg,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
(const struct uvc_descriptor_header *) &uvc_color_matching,
NULL,
};
static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
(const struct uvc_descriptor_header *) &uvc_format_yuv,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
(const struct uvc_descriptor_header *) &uvc_format_mjpg,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
(const struct uvc_descriptor_header *) &uvc_color_matching,
NULL,
};
/* --------------------------------------------------------------------------
* USB configuration
*/
static int __init
webcam_config_bind(struct usb_configuration *c)
{
return uvc_bind_config(c, uvc_control_cls, uvc_fs_streaming_cls,
uvc_hs_streaming_cls);
}
static struct usb_configuration webcam_config_driver = {
.label = webcam_config_label,
.bind = webcam_config_bind,
.bConfigurationValue = 1,
.iConfiguration = 0, /* dynamic */
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
};
static int /* __init_or_exit */
webcam_unbind(struct usb_composite_dev *cdev)
{
return 0;
}
static int __init
webcam_bind(struct usb_composite_dev *cdev)
{
int ret;
/* Allocate string descriptor numbers ... note that string contents
* can be overridden by the composite_dev glue.
*/
if ((ret = usb_string_id(cdev)) < 0)
goto error;
webcam_strings[STRING_MANUFACTURER_IDX].id = ret;
webcam_device_descriptor.iManufacturer = ret;
if ((ret = usb_string_id(cdev)) < 0)
goto error;
webcam_strings[STRING_PRODUCT_IDX].id = ret;
webcam_device_descriptor.iProduct = ret;
if ((ret = usb_string_id(cdev)) < 0)
goto error;
webcam_strings[STRING_DESCRIPTION_IDX].id = ret;
webcam_config_driver.iConfiguration = ret;
/* Register our configuration. */
if ((ret = usb_add_config(cdev, &webcam_config_driver)) < 0)
goto error;
INFO(cdev, "Webcam Video Gadget\n");
return 0;
error:
webcam_unbind(cdev);
return ret;
}
/* --------------------------------------------------------------------------
* Driver
*/
static struct usb_composite_driver webcam_driver = {
.name = "g_webcam",
.dev = &webcam_device_descriptor,
.strings = webcam_device_strings,
.bind = webcam_bind,
.unbind = webcam_unbind,
};
static int __init
webcam_init(void)
{
return usb_composite_register(&webcam_driver);
}
static void __exit
webcam_cleanup(void)
{
usb_composite_unregister(&webcam_driver);
}
module_init(webcam_init);
module_exit(webcam_cleanup);
MODULE_AUTHOR("Laurent Pinchart");
MODULE_DESCRIPTION("Webcam Video Gadget");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1.0");
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