kernel/drivers/usb/gadget/function/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class Gadget driver
   3  *
   4  *      Copyright (C) 2009-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/list.h>
  17 #include <linux/videodev2.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/wait.h>
  20
  21 #include <media/v4l2-dev.h>
  22 #include <media/v4l2-event.h>
  23 #include <media/v4l2-ioctl.h>
  24
  25 #include "f_uvc.h"
  26 #include "uvc.h"
  27 #include "uvc_queue.h"
  28 #include "uvc_video.h"
  29 #include "uvc_v4l2.h"
  30
  31 /* --------------------------------------------------------------------------
  32  * Requests handling
  33  */
  34
  35 static int
  36 uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
  37 {
  38         struct usb_composite_dev *cdev = uvc->func.config->cdev;
  39         struct usb_request *req = uvc->control_req;
  40
  41         if (data->length < 0)
  42                 return usb_ep_set_halt(cdev->gadget->ep0);
  43
  44         req->length = min_t(unsigned int, uvc->event_length, data->length);
  45         req->zero = data->length < uvc->event_length;
  46
  47         memcpy(req->buf, data->data, req->length);
  48
  49         return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
  50 }
  51
  52 /* --------------------------------------------------------------------------
  53  * V4L2 ioctls
  54  */
  55
  56 struct uvc_format
  57 {
  58         u8 bpp;
  59         u32 fcc;
  60 };
  61
  62 static struct uvc_format uvc_formats[] = {
  63         { 16, V4L2_PIX_FMT_YUYV  },
  64         { 0,  V4L2_PIX_FMT_MJPEG },
  65 };
  66
  67 static int
  68 uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
  69 {
  70         struct video_device *vdev = video_devdata(file);
  71         struct uvc_device *uvc = video_get_drvdata(vdev);
  72         struct usb_composite_dev *cdev = uvc->func.config->cdev;
  73
  74         strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
  75         strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
  76         strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
  77                 sizeof(cap->bus_info));
  78
  79         cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
  80         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  81
  82         return 0;
  83 }
  84
  85 static int
  86 uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
  87 {
  88         struct video_device *vdev = video_devdata(file);
  89         struct uvc_device *uvc = video_get_drvdata(vdev);
  90         struct uvc_video *video = &uvc->video;
  91
  92         fmt->fmt.pix.pixelformat = video->fcc;
  93         fmt->fmt.pix.width = video->width;
  94         fmt->fmt.pix.height = video->height;
  95         fmt->fmt.pix.field = V4L2_FIELD_NONE;
  96         fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
  97         fmt->fmt.pix.sizeimage = video->imagesize;
  98         fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
  99         fmt->fmt.pix.priv = 0;
 100
 101         return 0;
 102 }
 103
 104 static int
 105 uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
 106 {
 107         struct video_device *vdev = video_devdata(file);
 108         struct uvc_device *uvc = video_get_drvdata(vdev);
 109         struct uvc_video *video = &uvc->video;
 110         struct uvc_format *format;
 111         unsigned int imagesize;
 112         unsigned int bpl;
 113         unsigned int i;
 114
 115         for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
 116                 format = &uvc_formats[i];
 117                 if (format->fcc == fmt->fmt.pix.pixelformat)
 118                         break;
 119         }
 120
 121         if (i == ARRAY_SIZE(uvc_formats)) {
 122                 printk(KERN_INFO "Unsupported format 0x%08x.\n",
 123                         fmt->fmt.pix.pixelformat);
 124                 return -EINVAL;
 125         }
 126
 127         bpl = format->bpp * fmt->fmt.pix.width / 8;
 128         imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
 129
 130         video->fcc = format->fcc;
 131         video->bpp = format->bpp;
 132         video->width = fmt->fmt.pix.width;
 133         video->height = fmt->fmt.pix.height;
 134         video->imagesize = imagesize;
 135
 136         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 137         fmt->fmt.pix.bytesperline = bpl;
 138         fmt->fmt.pix.sizeimage = imagesize;
 139         fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 140         fmt->fmt.pix.priv = 0;
 141
 142         return 0;
 143 }
 144
 145 static int
 146 uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
 147 {
 148         struct video_device *vdev = video_devdata(file);
 149         struct uvc_device *uvc = video_get_drvdata(vdev);
 150         struct uvc_video *video = &uvc->video;
 151
 152         if (b->type != video->queue.queue.type)
 153                 return -EINVAL;
 154
 155         return uvcg_alloc_buffers(&video->queue, b);
 156 }
 157
 158 static int
 159 uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 160 {
 161         struct video_device *vdev = video_devdata(file);
 162         struct uvc_device *uvc = video_get_drvdata(vdev);
 163         struct uvc_video *video = &uvc->video;
 164
 165         return uvcg_query_buffer(&video->queue, b);
 166 }
 167
 168 static int
 169 uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 170 {
 171         struct video_device *vdev = video_devdata(file);
 172         struct uvc_device *uvc = video_get_drvdata(vdev);
 173         struct uvc_video *video = &uvc->video;
 174         int ret;
 175
 176         ret = uvcg_queue_buffer(&video->queue, b);
 177         if (ret < 0)
 178                 return ret;
 179
 180         return uvcg_video_pump(video);
 181 }
 182
 183 static int
 184 uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 185 {
 186         struct video_device *vdev = video_devdata(file);
 187         struct uvc_device *uvc = video_get_drvdata(vdev);
 188         struct uvc_video *video = &uvc->video;
 189
 190         return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
 191 }
 192
 193 static int
 194 uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 195 {
 196         struct video_device *vdev = video_devdata(file);
 197         struct uvc_device *uvc = video_get_drvdata(vdev);
 198         struct uvc_video *video = &uvc->video;
 199         int ret;
 200
 201         if (type != video->queue.queue.type)
 202                 return -EINVAL;
 203
 204         /* Enable UVC video. */
 205         ret = uvcg_video_enable(video, 1);
 206         if (ret < 0)
 207                 return ret;
 208
 209         /*
 210          * Complete the alternate setting selection setup phase now that
 211          * userspace is ready to provide video frames.
 212          */
 213         uvc_function_setup_continue(uvc);
 214         uvc->state = UVC_STATE_STREAMING;
 215
 216         return 0;
 217 }
 218
 219 static int
 220 uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 221 {
 222         struct video_device *vdev = video_devdata(file);
 223         struct uvc_device *uvc = video_get_drvdata(vdev);
 224         struct uvc_video *video = &uvc->video;
 225
 226         if (type != video->queue.queue.type)
 227                 return -EINVAL;
 228
 229         return uvcg_video_enable(video, 0);
 230 }
 231
 232 static int
 233 uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
 234                          const struct v4l2_event_subscription *sub)
 235 {
 236         if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
 237                 return -EINVAL;
 238
 239         return v4l2_event_subscribe(fh, sub, 2, NULL);
 240 }
 241
 242 static int
 243 uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
 244                            const struct v4l2_event_subscription *sub)
 245 {
 246         return v4l2_event_unsubscribe(fh, sub);
 247 }
 248
 249 static long
 250 uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
 251                        unsigned int cmd, void *arg)
 252 {
 253         struct video_device *vdev = video_devdata(file);
 254         struct uvc_device *uvc = video_get_drvdata(vdev);
 255
 256         switch (cmd) {
 257         case UVCIOC_SEND_RESPONSE:
 258                 return uvc_send_response(uvc, arg);
 259
 260         default:
 261                 return -ENOIOCTLCMD;
 262         }
 263 }
 264
 265 const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
 266         .vidioc_querycap = uvc_v4l2_querycap,
 267         .vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
 268         .vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
 269         .vidioc_reqbufs = uvc_v4l2_reqbufs,
 270         .vidioc_querybuf = uvc_v4l2_querybuf,
 271         .vidioc_qbuf = uvc_v4l2_qbuf,
 272         .vidioc_dqbuf = uvc_v4l2_dqbuf,
 273         .vidioc_streamon = uvc_v4l2_streamon,
 274         .vidioc_streamoff = uvc_v4l2_streamoff,
 275         .vidioc_subscribe_event = uvc_v4l2_subscribe_event,
 276         .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
 277         .vidioc_default = uvc_v4l2_ioctl_default,
 278 };
 279
 280 /* --------------------------------------------------------------------------
 281  * V4L2
 282  */
 283
 284 static int
 285 uvc_v4l2_open(struct file *file)
 286 {
 287         struct video_device *vdev = video_devdata(file);
 288         struct uvc_device *uvc = video_get_drvdata(vdev);
 289         struct uvc_file_handle *handle;
 290
 291         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 292         if (handle == NULL)
 293                 return -ENOMEM;
 294
 295         v4l2_fh_init(&handle->vfh, vdev);
 296         v4l2_fh_add(&handle->vfh);
 297
 298         handle->device = &uvc->video;
 299         file->private_data = &handle->vfh;
 300
 301         uvc_function_connect(uvc);
 302         return 0;
 303 }
 304
 305 static int
 306 uvc_v4l2_release(struct file *file)
 307 {
 308         struct video_device *vdev = video_devdata(file);
 309         struct uvc_device *uvc = video_get_drvdata(vdev);
 310         struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
 311         struct uvc_video *video = handle->device;
 312
 313         uvc_function_disconnect(uvc);
 314
 315         mutex_lock(&video->mutex);
 316         uvcg_video_enable(video, 0);
 317         uvcg_free_buffers(&video->queue);
 318         mutex_unlock(&video->mutex);
 319
 320         file->private_data = NULL;
 321         v4l2_fh_del(&handle->vfh);
 322         v4l2_fh_exit(&handle->vfh);
 323         kfree(handle);
 324
 325         return 0;
 326 }
 327
 328 static int
 329 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
 330 {
 331         struct video_device *vdev = video_devdata(file);
 332         struct uvc_device *uvc = video_get_drvdata(vdev);
 333
 334         return uvcg_queue_mmap(&uvc->video.queue, vma);
 335 }
 336
 337 static unsigned int
 338 uvc_v4l2_poll(struct file *file, poll_table *wait)
 339 {
 340         struct video_device *vdev = video_devdata(file);
 341         struct uvc_device *uvc = video_get_drvdata(vdev);
 342
 343         return uvcg_queue_poll(&uvc->video.queue, file, wait);
 344 }
 345
 346 #ifndef CONFIG_MMU
 347 static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
 348                 unsigned long addr, unsigned long len, unsigned long pgoff,
 349                 unsigned long flags)
 350 {
 351         struct video_device *vdev = video_devdata(file);
 352         struct uvc_device *uvc = video_get_drvdata(vdev);
 353
 354         return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
 355 }
 356 #endif
 357
 358 struct v4l2_file_operations uvc_v4l2_fops = {
 359         .owner          = THIS_MODULE,
 360         .open           = uvc_v4l2_open,
 361         .release        = uvc_v4l2_release,
 362         .unlocked_ioctl = video_ioctl2,
 363         .mmap           = uvc_v4l2_mmap,
 364         .poll           = uvc_v4l2_poll,
 365 #ifndef CONFIG_MMU
 366         .get_unmapped_area = uvcg_v4l2_get_unmapped_area,
 367 #endif
 368 };
 369