/* * 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 <linux/kernel.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/list.h> #include <linux/mutex.h> #include <linux/version.h> #include <linux/videodev2.h> #include <linux/vmalloc.h> #include <linux/wait.h> #include <media/v4l2-dev.h> #include <media/v4l2-event.h> #include <media/v4l2-ioctl.h> #include "uvc.h" #include "uvc_queue.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(uvc->event_length, data->length); req->zero = data->length < uvc->event_length; req->dma = DMA_ADDR_INVALID; memcpy(req->buf, data->data, data->length); return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL); } /* -------------------------------------------------------------------------- * V4L2 */ 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_get_format(struct uvc_video *video, struct v4l2_format *fmt) { 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 uvc_video *video, struct v4l2_format *fmt) { 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_open(struct file *file) { struct video_device *vdev = video_devdata(file); struct uvc_device *uvc = video_get_drvdata(vdev); struct uvc_file_handle *handle; int ret; handle = kzalloc(sizeof(*handle), GFP_KERNEL); if (handle == NULL) return -ENOMEM; ret = v4l2_fh_init(&handle->vfh, vdev); if (ret < 0) goto error; ret = v4l2_event_init(&handle->vfh); if (ret < 0) goto error; ret = v4l2_event_alloc(&handle->vfh, 8); if (ret < 0) goto error; v4l2_fh_add(&handle->vfh); handle->device = &uvc->video; file->private_data = &handle->vfh; uvc_function_connect(uvc); return 0; error: v4l2_fh_exit(&handle->vfh); return ret; } 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); uvc_video_enable(video, 0); mutex_lock(&video->queue.mutex); if (uvc_free_buffers(&video->queue) < 0) printk(KERN_ERR "uvc_v4l2_release: Unable to free " "buffers.\n"); mutex_unlock(&video->queue.mutex); file->private_data = NULL; v4l2_fh_del(&handle->vfh); v4l2_fh_exit(&handle->vfh); kfree(handle); return 0; } static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) { 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 usb_composite_dev *cdev = uvc->func.config->cdev; struct uvc_video *video = &uvc->video; int ret = 0; switch (cmd) { /* Query capabilities */ case VIDIOC_QUERYCAP: { struct v4l2_capability *cap = arg; memset(cap, 0, sizeof *cap); strncpy(cap->driver, "g_uvc", sizeof(cap->driver)); strncpy(cap->card, cdev->gadget->name, sizeof(cap->card)); strncpy(cap->bus_info, dev_name(&cdev->gadget->dev), sizeof cap->bus_info); cap->version = DRIVER_VERSION_NUMBER; cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; break; } /* Get & Set format */ case VIDIOC_G_FMT: { struct v4l2_format *fmt = arg; if (fmt->type != video->queue.type) return -EINVAL; return uvc_v4l2_get_format(video, fmt); } case VIDIOC_S_FMT: { struct v4l2_format *fmt = arg; if (fmt->type != video->queue.type) return -EINVAL; return uvc_v4l2_set_format(video, fmt); } /* Buffers & streaming */ case VIDIOC_REQBUFS: { struct v4l2_requestbuffers *rb = arg; if (rb->type != video->queue.type || rb->memory != V4L2_MEMORY_MMAP) return -EINVAL; ret = uvc_alloc_buffers(&video->queue, rb->count, video->imagesize); if (ret < 0) return ret; rb->count = ret; ret = 0; break; } case VIDIOC_QUERYBUF: { struct v4l2_buffer *buf = arg; if (buf->type != video->queue.type) return -EINVAL; return uvc_query_buffer(&video->queue, buf); } case VIDIOC_QBUF: if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0) return ret; return uvc_video_pump(video); case VIDIOC_DQBUF: return uvc_dequeue_buffer(&video->queue, arg, file->f_flags & O_NONBLOCK); case VIDIOC_STREAMON: { int *type = arg; if (*type != video->queue.type) return -EINVAL; return uvc_video_enable(video, 1); } case VIDIOC_STREAMOFF: { int *type = arg; if (*type != video->queue.type) return -EINVAL; return uvc_video_enable(video, 0); } /* Events */ case VIDIOC_DQEVENT: { struct v4l2_event *event = arg; ret = v4l2_event_dequeue(&handle->vfh, event, file->f_flags & O_NONBLOCK); if (ret == 0 && event->type == UVC_EVENT_SETUP) { struct uvc_event *uvc_event = (void *)&event->u.data; /* Tell the complete callback to generate an event for * the next request that will be enqueued by * uvc_event_write. */ uvc->event_setup_out = !(uvc_event->req.bRequestType & USB_DIR_IN); uvc->event_length = uvc_event->req.wLength; } return ret; } case VIDIOC_SUBSCRIBE_EVENT: { struct v4l2_event_subscription *sub = arg; if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST) return -EINVAL; return v4l2_event_subscribe(&handle->vfh, arg); } case VIDIOC_UNSUBSCRIBE_EVENT: return v4l2_event_unsubscribe(&handle->vfh, arg); case UVCIOC_SEND_RESPONSE: ret = uvc_send_response(uvc, arg); break; default: return -ENOIOCTLCMD; } return ret; } static long uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); } 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 uvc_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); struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); unsigned int mask = 0; poll_wait(file, &handle->vfh.events->wait, wait); if (v4l2_event_pending(&handle->vfh)) mask |= POLLPRI; mask |= uvc_queue_poll(&uvc->video.queue, file, wait); return mask; } static struct v4l2_file_operations uvc_v4l2_fops = { .owner = THIS_MODULE, .open = uvc_v4l2_open, .release = uvc_v4l2_release, .ioctl = uvc_v4l2_ioctl, .mmap = uvc_v4l2_mmap, .poll = uvc_v4l2_poll, };