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         v4l2_fh_init(&subdev_fh->vfh, vdev);
  79         v4l2_fh_add(&subdev_fh->vfh);
  80         file->private_data = &subdev_fh->vfh;
  81 #if defined(CONFIG_MEDIA_CONTROLLER)
  82         if (sd->v4l2_dev->mdev) {
  83                 entity = media_entity_get(&sd->entity);
  84                 if (!entity) {
  85                         ret = -EBUSY;
  86                         goto err;
  87                 }
  88         }
  89 #endif
  90
  91         if (sd->internal_ops && sd->internal_ops->open) {
  92                 ret = sd->internal_ops->open(sd, subdev_fh);
  93                 if (ret < 0)
  94                         goto err;
  95         }
  96
  97         return 0;
  98
  99 err:
 100 #if defined(CONFIG_MEDIA_CONTROLLER)
 101         if (entity)
 102                 media_entity_put(entity);
 103 #endif
 104         v4l2_fh_del(&subdev_fh->vfh);
 105         v4l2_fh_exit(&subdev_fh->vfh);
 106         subdev_fh_free(subdev_fh);
 107         kfree(subdev_fh);
 108
 109         return ret;
 110 }
 111
 112 static int subdev_close(struct file *file)
 113 {
 114         struct video_device *vdev = video_devdata(file);
 115         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 116         struct v4l2_fh *vfh = file->private_data;
 117         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 118
 119         if (sd->internal_ops && sd->internal_ops->close)
 120                 sd->internal_ops->close(sd, subdev_fh);
 121 #if defined(CONFIG_MEDIA_CONTROLLER)
 122         if (sd->v4l2_dev->mdev)
 123                 media_entity_put(&sd->entity);
 124 #endif
 125         v4l2_fh_del(vfh);
 126         v4l2_fh_exit(vfh);
 127         subdev_fh_free(subdev_fh);
 128         kfree(subdev_fh);
 129         file->private_data = NULL;
 130
 131         return 0;
 132 }
 133
 134 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 135 {
 136         struct video_device *vdev = video_devdata(file);
 137         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 138         struct v4l2_fh *vfh = file->private_data;
 139 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 140         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 141 #endif
 142
 143         switch (cmd) {
 144         case VIDIOC_QUERYCTRL:
 145                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 146
 147         case VIDIOC_QUERYMENU:
 148                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 149
 150         case VIDIOC_G_CTRL:
 151                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 152
 153         case VIDIOC_S_CTRL:
 154                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 155
 156         case VIDIOC_G_EXT_CTRLS:
 157                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
 158
 159         case VIDIOC_S_EXT_CTRLS:
 160                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
 161
 162         case VIDIOC_TRY_EXT_CTRLS:
 163                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
 164
 165         case VIDIOC_DQEVENT:
 166                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 167                         return -ENOIOCTLCMD;
 168
 169                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 170
 171         case VIDIOC_SUBSCRIBE_EVENT:
 172                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 173
 174         case VIDIOC_UNSUBSCRIBE_EVENT:
 175                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 176 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 177         case VIDIOC_SUBDEV_G_FMT: {
 178                 struct v4l2_subdev_format *format = arg;
 179
 180                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 181                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 182                         return -EINVAL;
 183
 184                 if (format->pad >= sd->entity.num_pads)
 185                         return -EINVAL;
 186
 187                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
 188         }
 189
 190         case VIDIOC_SUBDEV_S_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, set_fmt, subdev_fh, format);
 201         }
 202
 203         case VIDIOC_SUBDEV_G_CROP: {
 204                 struct v4l2_subdev_crop *crop = arg;
 205
 206                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 207                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 208                         return -EINVAL;
 209
 210                 if (crop->pad >= sd->entity.num_pads)
 211                         return -EINVAL;
 212
 213                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
 214         }
 215
 216         case VIDIOC_SUBDEV_S_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, set_crop, subdev_fh, crop);
 227         }
 228
 229         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 230                 struct v4l2_subdev_mbus_code_enum *code = arg;
 231
 232                 if (code->pad >= sd->entity.num_pads)
 233                         return -EINVAL;
 234
 235                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
 236                                         code);
 237         }
 238
 239         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 240                 struct v4l2_subdev_frame_size_enum *fse = arg;
 241
 242                 if (fse->pad >= sd->entity.num_pads)
 243                         return -EINVAL;
 244
 245                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
 246                                         fse);
 247         }
 248
 249         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
 250                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 251
 252         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
 253                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 254
 255         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 256                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 257
 258                 if (fie->pad >= sd->entity.num_pads)
 259                         return -EINVAL;
 260
 261                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
 262                                         fie);
 263         }
 264 #endif
 265         default:
 266                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 267         }
 268
 269         return 0;
 270 }
 271
 272 static long subdev_ioctl(struct file *file, unsigned int cmd,
 273         unsigned long arg)
 274 {
 275         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
 276 }
 277
 278 static unsigned int subdev_poll(struct file *file, poll_table *wait)
 279 {
 280         struct video_device *vdev = video_devdata(file);
 281         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 282         struct v4l2_fh *fh = file->private_data;
 283
 284         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 285                 return POLLERR;
 286
 287         poll_wait(file, &fh->wait, wait);
 288
 289         if (v4l2_event_pending(fh))
 290                 return POLLPRI;
 291
 292         return 0;
 293 }
 294
 295 const struct v4l2_file_operations v4l2_subdev_fops = {
 296         .owner = THIS_MODULE,
 297         .open = subdev_open,
 298         .unlocked_ioctl = subdev_ioctl,
 299         .release = subdev_close,
 300         .poll = subdev_poll,
 301 };
 302
 303 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 304 {
 305         INIT_LIST_HEAD(&sd->list);
 306         BUG_ON(!ops);
 307         sd->ops = ops;
 308         sd->v4l2_dev = NULL;
 309         sd->flags = 0;
 310         sd->name[0] = '\0';
 311         sd->grp_id = 0;
 312         sd->dev_priv = NULL;
 313         sd->host_priv = NULL;
 314 #if defined(CONFIG_MEDIA_CONTROLLER)
 315         sd->entity.name = sd->name;
 316         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
 317 #endif
 318 }
 319 EXPORT_SYMBOL(v4l2_subdev_init);