drivers/media/video/v4l2-subdev.c

   1 /*
   2  * V4L2 sub-device
   3  *
   4  * Copyright (C) 2010 Nokia Corporation
   5  *
   6  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   7  *          Sakari Ailus <sakari.ailus@iki.fi>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/ioctl.h>
  24 #include <linux/slab.h>
  25 #include <linux/types.h>
  26 #include <linux/videodev2.h>
  27
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ioctl.h>
  31 #include <media/v4l2-fh.h>
  32 #include <media/v4l2-event.h>
  33
  34 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  35 {
  36 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  37         /* Allocate try format and crop in the same memory block */
  38         fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
  39                               * sd->entity.num_pads, GFP_KERNEL);
  40         if (fh->try_fmt == NULL)
  41                 return -ENOMEM;
  42
  43         fh->try_crop = (struct v4l2_rect *)
  44                 (fh->try_fmt + sd->entity.num_pads);
  45 #endif
  46         return 0;
  47 }
  48
  49 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  50 {
  51 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  52         kfree(fh->try_fmt);
  53         fh->try_fmt = NULL;
  54         fh->try_crop = NULL;
  55 #endif
  56 }
  57
  58 static int subdev_open(struct file *file)
  59 {
  60         struct video_device *vdev = video_devdata(file);
  61         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  62         struct v4l2_subdev_fh *subdev_fh;
  63 #if defined(CONFIG_MEDIA_CONTROLLER)
  64         struct media_entity *entity = NULL;
  65 #endif
  66         int ret;
  67
  68         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  69         if (subdev_fh == NULL)
  70                 return -ENOMEM;
  71
  72         ret = subdev_fh_init(subdev_fh, sd);
  73         if (ret) {
  74                 kfree(subdev_fh);
  75                 return ret;
  76         }
  77
  78         ret = v4l2_fh_init(&subdev_fh->vfh, vdev);
  79         if (ret)
  80                 goto err;
  81
  82         if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
  83                 ret = v4l2_event_init(&subdev_fh->vfh);
  84                 if (ret)
  85                         goto err;
  86
  87                 ret = v4l2_event_alloc(&subdev_fh->vfh, sd->nevents);
  88                 if (ret)
  89                         goto err;
  90         }
  91
  92         v4l2_fh_add(&subdev_fh->vfh);
  93         file->private_data = &subdev_fh->vfh;
  94 #if defined(CONFIG_MEDIA_CONTROLLER)
  95         if (sd->v4l2_dev->mdev) {
  96                 entity = media_entity_get(&sd->entity);
  97                 if (!entity) {
  98                         ret = -EBUSY;
  99                         goto err;
 100                 }
 101         }
 102 #endif
 103
 104         if (sd->internal_ops && sd->internal_ops->open) {
 105                 ret = sd->internal_ops->open(sd, subdev_fh);
 106                 if (ret < 0)
 107                         goto err;
 108         }
 109
 110         return 0;
 111
 112 err:
 113 #if defined(CONFIG_MEDIA_CONTROLLER)
 114         if (entity)
 115                 media_entity_put(entity);
 116 #endif
 117         v4l2_fh_del(&subdev_fh->vfh);
 118         v4l2_fh_exit(&subdev_fh->vfh);
 119         subdev_fh_free(subdev_fh);
 120         kfree(subdev_fh);
 121
 122         return ret;
 123 }
 124
 125 static int subdev_close(struct file *file)
 126 {
 127         struct video_device *vdev = video_devdata(file);
 128         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 129         struct v4l2_fh *vfh = file->private_data;
 130         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 131
 132         if (sd->internal_ops && sd->internal_ops->close)
 133                 sd->internal_ops->close(sd, subdev_fh);
 134 #if defined(CONFIG_MEDIA_CONTROLLER)
 135         if (sd->v4l2_dev->mdev)
 136                 media_entity_put(&sd->entity);
 137 #endif
 138         v4l2_fh_del(vfh);
 139         v4l2_fh_exit(vfh);
 140         subdev_fh_free(subdev_fh);
 141         kfree(subdev_fh);
 142         file->private_data = NULL;
 143
 144         return 0;
 145 }
 146
 147 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 148 {
 149         struct video_device *vdev = video_devdata(file);
 150         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 151         struct v4l2_fh *vfh = file->private_data;
 152 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 153         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 154 #endif
 155
 156         switch (cmd) {
 157         case VIDIOC_QUERYCTRL:
 158                 return v4l2_queryctrl(sd->ctrl_handler, arg);
 159
 160         case VIDIOC_QUERYMENU:
 161                 return v4l2_querymenu(sd->ctrl_handler, arg);
 162
 163         case VIDIOC_G_CTRL:
 164                 return v4l2_g_ctrl(sd->ctrl_handler, arg);
 165
 166         case VIDIOC_S_CTRL:
 167                 return v4l2_s_ctrl(sd->ctrl_handler, arg);
 168
 169         case VIDIOC_G_EXT_CTRLS:
 170                 return v4l2_g_ext_ctrls(sd->ctrl_handler, arg);
 171
 172         case VIDIOC_S_EXT_CTRLS:
 173                 return v4l2_s_ext_ctrls(sd->ctrl_handler, arg);
 174
 175         case VIDIOC_TRY_EXT_CTRLS:
 176                 return v4l2_try_ext_ctrls(sd->ctrl_handler, arg);
 177
 178         case VIDIOC_DQEVENT:
 179                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 180                         return -ENOIOCTLCMD;
 181
 182                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 183
 184         case VIDIOC_SUBSCRIBE_EVENT:
 185                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 186
 187         case VIDIOC_UNSUBSCRIBE_EVENT:
 188                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 189 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 190         case VIDIOC_SUBDEV_G_FMT: {
 191                 struct v4l2_subdev_format *format = arg;
 192
 193                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 194                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 195                         return -EINVAL;
 196
 197                 if (format->pad >= sd->entity.num_pads)
 198                         return -EINVAL;
 199
 200                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
 201         }
 202
 203         case VIDIOC_SUBDEV_S_FMT: {
 204                 struct v4l2_subdev_format *format = arg;
 205
 206                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 207                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 208                         return -EINVAL;
 209
 210                 if (format->pad >= sd->entity.num_pads)
 211                         return -EINVAL;
 212
 213                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
 214         }
 215
 216         case VIDIOC_SUBDEV_G_CROP: {
 217                 struct v4l2_subdev_crop *crop = arg;
 218
 219                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 220                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 221                         return -EINVAL;
 222
 223                 if (crop->pad >= sd->entity.num_pads)
 224                         return -EINVAL;
 225
 226                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
 227         }
 228
 229         case VIDIOC_SUBDEV_S_CROP: {
 230                 struct v4l2_subdev_crop *crop = arg;
 231
 232                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 233                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 234                         return -EINVAL;
 235
 236                 if (crop->pad >= sd->entity.num_pads)
 237                         return -EINVAL;
 238
 239                 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
 240         }
 241
 242         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 243                 struct v4l2_subdev_mbus_code_enum *code = arg;
 244
 245                 if (code->pad >= sd->entity.num_pads)
 246                         return -EINVAL;
 247
 248                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
 249                                         code);
 250         }
 251
 252         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 253                 struct v4l2_subdev_frame_size_enum *fse = arg;
 254
 255                 if (fse->pad >= sd->entity.num_pads)
 256                         return -EINVAL;
 257
 258                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
 259                                         fse);
 260         }
 261
 262         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
 263                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 264
 265         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
 266                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 267
 268         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 269                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 270
 271                 if (fie->pad >= sd->entity.num_pads)
 272                         return -EINVAL;
 273
 274                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
 275                                         fie);
 276         }
 277 #endif
 278         default:
 279                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 280         }
 281
 282         return 0;
 283 }
 284
 285 static long subdev_ioctl(struct file *file, unsigned int cmd,
 286         unsigned long arg)
 287 {
 288         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
 289 }
 290
 291 static unsigned int subdev_poll(struct file *file, poll_table *wait)
 292 {
 293         struct video_device *vdev = video_devdata(file);
 294         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 295         struct v4l2_fh *fh = file->private_data;
 296
 297         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 298                 return POLLERR;
 299
 300         poll_wait(file, &fh->events->wait, wait);
 301
 302         if (v4l2_event_pending(fh))
 303                 return POLLPRI;
 304
 305         return 0;
 306 }
 307
 308 const struct v4l2_file_operations v4l2_subdev_fops = {
 309         .owner = THIS_MODULE,
 310         .open = subdev_open,
 311         .unlocked_ioctl = subdev_ioctl,
 312         .release = subdev_close,
 313         .poll = subdev_poll,
 314 };
 315
 316 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 317 {
 318         INIT_LIST_HEAD(&sd->list);
 319         BUG_ON(!ops);
 320         sd->ops = ops;
 321         sd->v4l2_dev = NULL;
 322         sd->flags = 0;
 323         sd->name[0] = '\0';
 324         sd->grp_id = 0;
 325         sd->dev_priv = NULL;
 326         sd->host_priv = NULL;
 327 #if defined(CONFIG_MEDIA_CONTROLLER)
 328         sd->entity.name = sd->name;
 329         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
 330 #endif
 331 }
 332 EXPORT_SYMBOL(v4l2_subdev_init);