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/mutex.h>
  18 #include <linux/videodev2.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/wait.h>
  21
  22 #include <media/v4l2-dev.h>
  23 #include <media/v4l2-event.h>
  24 #include <media/v4l2-ioctl.h>
  25
  26 #include "f_uvc.h"
  27 #include "uvc.h"
  28 #include "uvc_queue.h"
  29 #include "uvc_video.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->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
  80
  81         return 0;
  82 }
  83
  84 static int
  85 uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
  86 {
  87         struct video_device *vdev = video_devdata(file);
  88         struct uvc_device *uvc = video_get_drvdata(vdev);
  89         struct uvc_video *video = &uvc->video;
  90
  91         fmt->fmt.pix.pixelformat = video->fcc;
  92         fmt->fmt.pix.width = video->width;
  93         fmt->fmt.pix.height = video->height;
  94         fmt->fmt.pix.field = V4L2_FIELD_NONE;
  95         fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
  96         fmt->fmt.pix.sizeimage = video->imagesize;
  97         fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
  98         fmt->fmt.pix.priv = 0;
  99
 100         return 0;
 101 }
 102
 103 static int
 104 uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
 105 {
 106         struct video_device *vdev = video_devdata(file);
 107         struct uvc_device *uvc = video_get_drvdata(vdev);
 108         struct uvc_video *video = &uvc->video;
 109         struct uvc_format *format;
 110         unsigned int imagesize;
 111         unsigned int bpl;
 112         unsigned int i;
 113
 114         for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
 115                 format = &uvc_formats[i];
 116                 if (format->fcc == fmt->fmt.pix.pixelformat)
 117                         break;
 118         }
 119
 120         if (i == ARRAY_SIZE(uvc_formats)) {
 121                 printk(KERN_INFO "Unsupported format 0x%08x.\n",
 122                         fmt->fmt.pix.pixelformat);
 123                 return -EINVAL;
 124         }
 125
 126         bpl = format->bpp * fmt->fmt.pix.width / 8;
 127         imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
 128
 129         video->fcc = format->fcc;
 130         video->bpp = format->bpp;
 131         video->width = fmt->fmt.pix.width;
 132         video->height = fmt->fmt.pix.height;
 133         video->imagesize = imagesize;
 134
 135         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 136         fmt->fmt.pix.bytesperline = bpl;
 137         fmt->fmt.pix.sizeimage = imagesize;
 138         fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 139         fmt->fmt.pix.priv = 0;
 140
 141         return 0;
 142 }
 143
 144 static int
 145 uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
 146 {
 147         struct video_device *vdev = video_devdata(file);
 148         struct uvc_device *uvc = video_get_drvdata(vdev);
 149         struct uvc_video *video = &uvc->video;
 150
 151         if (b->type != video->queue.queue.type)
 152                 return -EINVAL;
 153
 154         return uvcg_alloc_buffers(&video->queue, b);
 155 }
 156
 157 static int
 158 uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 159 {
 160         struct video_device *vdev = video_devdata(file);
 161         struct uvc_device *uvc = video_get_drvdata(vdev);
 162         struct uvc_video *video = &uvc->video;
 163
 164         return uvcg_query_buffer(&video->queue, b);
 165 }
 166
 167 static int
 168 uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 169 {
 170         struct video_device *vdev = video_devdata(file);
 171         struct uvc_device *uvc = video_get_drvdata(vdev);
 172         struct uvc_video *video = &uvc->video;
 173         int ret;
 174
 175         ret = uvcg_queue_buffer(&video->queue, b);
 176         if (ret < 0)
 177                 return ret;
 178
 179         return uvcg_video_pump(video);
 180 }
 181
 182 static int
 183 uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 184 {
 185         struct video_device *vdev = video_devdata(file);
 186         struct uvc_device *uvc = video_get_drvdata(vdev);
 187         struct uvc_video *video = &uvc->video;
 188
 189         return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
 190 }
 191
 192 static int
 193 uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 194 {
 195         struct video_device *vdev = video_devdata(file);
 196         struct uvc_device *uvc = video_get_drvdata(vdev);
 197         struct uvc_video *video = &uvc->video;
 198         int ret;
 199
 200         if (type != video->queue.queue.type)
 201                 return -EINVAL;
 202
 203         /* Enable UVC video. */
 204         ret = uvcg_video_enable(video, 1);
 205         if (ret < 0)
 206                 return ret;
 207
 208         /*
 209          * Complete the alternate setting selection setup phase now that
 210          * userspace is ready to provide video frames.
 211          */
 212         uvc_function_setup_continue(uvc);
 213         uvc->state = UVC_STATE_STREAMING;
 214
 215         return 0;
 216 }
 217
 218 static int
 219 uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 220 {
 221         struct video_device *vdev = video_devdata(file);
 222         struct uvc_device *uvc = video_get_drvdata(vdev);
 223         struct uvc_video *video = &uvc->video;
 224
 225         if (type != video->queue.queue.type)
 226                 return -EINVAL;
 227
 228         return uvcg_video_enable(video, 0);
 229 }
 230
 231 static int
 232 uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
 233                          const struct v4l2_event_subscription *sub)
 234 {
 235         if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
 236                 return -EINVAL;
 237
 238         return v4l2_event_subscribe(fh, sub, 2, NULL);
 239 }
 240
 241 static int
 242 uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
 243                            const struct v4l2_event_subscription *sub)
 244 {
 245         return v4l2_event_unsubscribe(fh, sub);
 246 }
 247
 248 static long
 249 uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
 250                        unsigned int cmd, void *arg)
 251 {
 252         struct video_device *vdev = video_devdata(file);
 253         struct uvc_device *uvc = video_get_drvdata(vdev);
 254
 255         switch (cmd) {
 256         case UVCIOC_SEND_RESPONSE:
 257                 return uvc_send_response(uvc, arg);
 258
 259         default:
 260                 return -ENOIOCTLCMD;
 261         }
 262 }
 263
 264 const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
 265         .vidioc_querycap = uvc_v4l2_querycap,
 266         .vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
 267         .vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
 268         .vidioc_reqbufs = uvc_v4l2_reqbufs,
 269         .vidioc_querybuf = uvc_v4l2_querybuf,
 270         .vidioc_qbuf = uvc_v4l2_qbuf,
 271         .vidioc_dqbuf = uvc_v4l2_dqbuf,
 272         .vidioc_streamon = uvc_v4l2_streamon,
 273         .vidioc_streamoff = uvc_v4l2_streamoff,
 274         .vidioc_subscribe_event = uvc_v4l2_subscribe_event,
 275         .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
 276         .vidioc_default = uvc_v4l2_ioctl_default,
 277 };
 278
 279 /* --------------------------------------------------------------------------
 280  * V4L2
 281  */
 282
 283 static int
 284 uvc_v4l2_open(struct file *file)
 285 {
 286         struct video_device *vdev = video_devdata(file);
 287         struct uvc_device *uvc = video_get_drvdata(vdev);
 288         struct uvc_file_handle *handle;
 289
 290         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 291         if (handle == NULL)
 292                 return -ENOMEM;
 293
 294         v4l2_fh_init(&handle->vfh, vdev);
 295         v4l2_fh_add(&handle->vfh);
 296
 297         handle->device = &uvc->video;
 298         file->private_data = &handle->vfh;
 299
 300         uvc_function_connect(uvc);
 301         return 0;
 302 }
 303
 304 static int
 305 uvc_v4l2_release(struct file *file)
 306 {
 307         struct video_device *vdev = video_devdata(file);
 308         struct uvc_device *uvc = video_get_drvdata(vdev);
 309         struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
 310         struct uvc_video *video = handle->device;
 311
 312         uvc_function_disconnect(uvc);
 313
 314         uvcg_video_enable(video, 0);
 315         uvcg_free_buffers(&video->queue);
 316
 317         file->private_data = NULL;
 318         v4l2_fh_del(&handle->vfh);
 319         v4l2_fh_exit(&handle->vfh);
 320         kfree(handle);
 321
 322         return 0;
 323 }
 324
 325 static int
 326 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
 327 {
 328         struct video_device *vdev = video_devdata(file);
 329         struct uvc_device *uvc = video_get_drvdata(vdev);
 330
 331         return uvcg_queue_mmap(&uvc->video.queue, vma);
 332 }
 333
 334 static unsigned int
 335 uvc_v4l2_poll(struct file *file, poll_table *wait)
 336 {
 337         struct video_device *vdev = video_devdata(file);
 338         struct uvc_device *uvc = video_get_drvdata(vdev);
 339
 340         return uvcg_queue_poll(&uvc->video.queue, file, wait);
 341 }
 342
 343 #ifndef CONFIG_MMU
 344 static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
 345                 unsigned long addr, unsigned long len, unsigned long pgoff,
 346                 unsigned long flags)
 347 {
 348         struct video_device *vdev = video_devdata(file);
 349         struct uvc_device *uvc = video_get_drvdata(vdev);
 350
 351         return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
 352 }
 353 #endif
 354
 355 struct v4l2_file_operations uvc_v4l2_fops = {
 356         .owner          = THIS_MODULE,
 357         .open           = uvc_v4l2_open,
 358         .release        = uvc_v4l2_release,
 359         .ioctl          = video_ioctl2,
 360         .mmap           = uvc_v4l2_mmap,
 361         .poll           = uvc_v4l2_poll,
 362 #ifndef CONFIG_MMU
 363         .get_unmapped_area = uvcg_v4l2_get_unmapped_area,
 364 #endif
 365 };
 366