X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fusb%2Fgadget%2Ffunction%2Fuvc_v4l2.c;fp=kernel%2Fdrivers%2Fusb%2Fgadget%2Ffunction%2Fuvc_v4l2.c;h=f4ccbd56f4d254c42112f3ae89949aefe6d5c8d1;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/usb/gadget/function/uvc_v4l2.c b/kernel/drivers/usb/gadget/function/uvc_v4l2.c new file mode 100644 index 000000000..f4ccbd56f --- /dev/null +++ b/kernel/drivers/usb/gadget/function/uvc_v4l2.c @@ -0,0 +1,369 @@ +/* + * uvc_v4l2.c -- USB Video Class Gadget driver + * + * Copyright (C) 2009-2010 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "f_uvc.h" +#include "uvc.h" +#include "uvc_queue.h" +#include "uvc_video.h" +#include "uvc_v4l2.h" + +/* -------------------------------------------------------------------------- + * Requests handling + */ + +static int +uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) +{ + struct usb_composite_dev *cdev = uvc->func.config->cdev; + struct usb_request *req = uvc->control_req; + + if (data->length < 0) + return usb_ep_set_halt(cdev->gadget->ep0); + + req->length = min_t(unsigned int, uvc->event_length, data->length); + req->zero = data->length < uvc->event_length; + + memcpy(req->buf, data->data, req->length); + + return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL); +} + +/* -------------------------------------------------------------------------- + * V4L2 ioctls + */ + +struct uvc_format +{ + u8 bpp; + u32 fcc; +}; + +static struct uvc_format uvc_formats[] = { + { 16, V4L2_PIX_FMT_YUYV }, + { 0, V4L2_PIX_FMT_MJPEG }, +}; + +static int +uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct usb_composite_dev *cdev = uvc->func.config->cdev; + + strlcpy(cap->driver, "g_uvc", sizeof(cap->driver)); + strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card)); + strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev), + sizeof(cap->bus_info)); + + cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; + + return 0; +} + +static int +uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + + fmt->fmt.pix.pixelformat = video->fcc; + fmt->fmt.pix.width = video->width; + fmt->fmt.pix.height = video->height; + fmt->fmt.pix.field = V4L2_FIELD_NONE; + fmt->fmt.pix.bytesperline = video->bpp * video->width / 8; + fmt->fmt.pix.sizeimage = video->imagesize; + fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; + fmt->fmt.pix.priv = 0; + + return 0; +} + +static int +uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + struct uvc_format *format; + unsigned int imagesize; + unsigned int bpl; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) { + format = &uvc_formats[i]; + if (format->fcc == fmt->fmt.pix.pixelformat) + break; + } + + if (i == ARRAY_SIZE(uvc_formats)) { + printk(KERN_INFO "Unsupported format 0x%08x.\n", + fmt->fmt.pix.pixelformat); + return -EINVAL; + } + + bpl = format->bpp * fmt->fmt.pix.width / 8; + imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage; + + video->fcc = format->fcc; + video->bpp = format->bpp; + video->width = fmt->fmt.pix.width; + video->height = fmt->fmt.pix.height; + video->imagesize = imagesize; + + fmt->fmt.pix.field = V4L2_FIELD_NONE; + fmt->fmt.pix.bytesperline = bpl; + fmt->fmt.pix.sizeimage = imagesize; + fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; + fmt->fmt.pix.priv = 0; + + return 0; +} + +static int +uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + + if (b->type != video->queue.queue.type) + return -EINVAL; + + return uvcg_alloc_buffers(&video->queue, b); +} + +static int +uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + + return uvcg_query_buffer(&video->queue, b); +} + +static int +uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + int ret; + + ret = uvcg_queue_buffer(&video->queue, b); + if (ret < 0) + return ret; + + return uvcg_video_pump(video); +} + +static int +uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + + return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK); +} + +static int +uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + int ret; + + if (type != video->queue.queue.type) + return -EINVAL; + + /* Enable UVC video. */ + ret = uvcg_video_enable(video, 1); + if (ret < 0) + return ret; + + /* + * Complete the alternate setting selection setup phase now that + * userspace is ready to provide video frames. + */ + uvc_function_setup_continue(uvc); + uvc->state = UVC_STATE_STREAMING; + + return 0; +} + +static int +uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_video *video = &uvc->video; + + if (type != video->queue.queue.type) + return -EINVAL; + + return uvcg_video_enable(video, 0); +} + +static int +uvc_v4l2_subscribe_event(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST) + return -EINVAL; + + return v4l2_event_subscribe(fh, sub, 2, NULL); +} + +static int +uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + return v4l2_event_unsubscribe(fh, sub); +} + +static long +uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio, + unsigned int cmd, void *arg) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + + switch (cmd) { + case UVCIOC_SEND_RESPONSE: + return uvc_send_response(uvc, arg); + + default: + return -ENOIOCTLCMD; + } +} + +const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = { + .vidioc_querycap = uvc_v4l2_querycap, + .vidioc_g_fmt_vid_out = uvc_v4l2_get_format, + .vidioc_s_fmt_vid_out = uvc_v4l2_set_format, + .vidioc_reqbufs = uvc_v4l2_reqbufs, + .vidioc_querybuf = uvc_v4l2_querybuf, + .vidioc_qbuf = uvc_v4l2_qbuf, + .vidioc_dqbuf = uvc_v4l2_dqbuf, + .vidioc_streamon = uvc_v4l2_streamon, + .vidioc_streamoff = uvc_v4l2_streamoff, + .vidioc_subscribe_event = uvc_v4l2_subscribe_event, + .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event, + .vidioc_default = uvc_v4l2_ioctl_default, +}; + +/* -------------------------------------------------------------------------- + * V4L2 + */ + +static int +uvc_v4l2_open(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_file_handle *handle; + + handle = kzalloc(sizeof(*handle), GFP_KERNEL); + if (handle == NULL) + return -ENOMEM; + + v4l2_fh_init(&handle->vfh, vdev); + v4l2_fh_add(&handle->vfh); + + handle->device = &uvc->video; + file->private_data = &handle->vfh; + + uvc_function_connect(uvc); + return 0; +} + +static int +uvc_v4l2_release(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); + struct uvc_video *video = handle->device; + + uvc_function_disconnect(uvc); + + mutex_lock(&video->mutex); + uvcg_video_enable(video, 0); + uvcg_free_buffers(&video->queue); + mutex_unlock(&video->mutex); + + file->private_data = NULL; + v4l2_fh_del(&handle->vfh); + v4l2_fh_exit(&handle->vfh); + kfree(handle); + + return 0; +} + +static int +uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + + return uvcg_queue_mmap(&uvc->video.queue, vma); +} + +static unsigned int +uvc_v4l2_poll(struct file *file, poll_table *wait) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + + return uvcg_queue_poll(&uvc->video.queue, file, wait); +} + +#ifndef CONFIG_MMU +static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file, + unsigned long addr, unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + struct video_device *vdev = video_devdata(file); + struct uvc_device *uvc = video_get_drvdata(vdev); + + return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff); +} +#endif + +struct v4l2_file_operations uvc_v4l2_fops = { + .owner = THIS_MODULE, + .open = uvc_v4l2_open, + .release = uvc_v4l2_release, + .unlocked_ioctl = video_ioctl2, + .mmap = uvc_v4l2_mmap, + .poll = uvc_v4l2_poll, +#ifndef CONFIG_MMU + .get_unmapped_area = uvcg_v4l2_get_unmapped_area, +#endif +}; +