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 #include <linux/export.h>
  28
  29 #include <media/v4l2-ctrls.h>
  30 #include <media/v4l2-device.h>
  31 #include <media/v4l2-ioctl.h>
  32 #include <media/v4l2-fh.h>
  33 #include <media/v4l2-event.h>
  34
  35 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
  36 {
  37 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  38         /* Allocate try format and crop in the same memory block */
  39         fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
  40                               * sd->entity.num_pads, GFP_KERNEL);
  41         if (fh->try_fmt == NULL)
  42                 return -ENOMEM;
  43
  44         fh->try_crop = (struct v4l2_rect *)
  45                 (fh->try_fmt + sd->entity.num_pads);
  46 #endif
  47         return 0;
  48 }
  49
  50 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
  51 {
  52 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
  53         kfree(fh->try_fmt);
  54         fh->try_fmt = NULL;
  55         fh->try_crop = NULL;
  56 #endif
  57 }
  58
  59 static int subdev_open(struct file *file)
  60 {
  61         struct video_device *vdev = video_devdata(file);
  62         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
  63         struct v4l2_subdev_fh *subdev_fh;
  64 #if defined(CONFIG_MEDIA_CONTROLLER)
  65         struct media_entity *entity = NULL;
  66 #endif
  67         int ret;
  68
  69         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
  70         if (subdev_fh == NULL)
  71                 return -ENOMEM;
  72
  73         ret = subdev_fh_init(subdev_fh, sd);
  74         if (ret) {
  75                 kfree(subdev_fh);
  76                 return ret;
  77         }
  78
  79         v4l2_fh_init(&subdev_fh->vfh, vdev);
  80         v4l2_fh_add(&subdev_fh->vfh);
  81         file->private_data = &subdev_fh->vfh;
  82 #if defined(CONFIG_MEDIA_CONTROLLER)
  83         if (sd->v4l2_dev->mdev) {
  84                 entity = media_entity_get(&sd->entity);
  85                 if (!entity) {
  86                         ret = -EBUSY;
  87                         goto err;
  88                 }
  89         }
  90 #endif
  91
  92         if (sd->internal_ops && sd->internal_ops->open) {
  93                 ret = sd->internal_ops->open(sd, subdev_fh);
  94                 if (ret < 0)
  95                         goto err;
  96         }
  97
  98         return 0;
  99
 100 err:
 101 #if defined(CONFIG_MEDIA_CONTROLLER)
 102         if (entity)
 103                 media_entity_put(entity);
 104 #endif
 105         v4l2_fh_del(&subdev_fh->vfh);
 106         v4l2_fh_exit(&subdev_fh->vfh);
 107         subdev_fh_free(subdev_fh);
 108         kfree(subdev_fh);
 109
 110         return ret;
 111 }
 112
 113 static int subdev_close(struct file *file)
 114 {
 115         struct video_device *vdev = video_devdata(file);
 116         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 117         struct v4l2_fh *vfh = file->private_data;
 118         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 119
 120         if (sd->internal_ops && sd->internal_ops->close)
 121                 sd->internal_ops->close(sd, subdev_fh);
 122 #if defined(CONFIG_MEDIA_CONTROLLER)
 123         if (sd->v4l2_dev->mdev)
 124                 media_entity_put(&sd->entity);
 125 #endif
 126         v4l2_fh_del(vfh);
 127         v4l2_fh_exit(vfh);
 128         subdev_fh_free(subdev_fh);
 129         kfree(subdev_fh);
 130         file->private_data = NULL;
 131
 132         return 0;
 133 }
 134
 135 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 136 {
 137         struct video_device *vdev = video_devdata(file);
 138         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 139         struct v4l2_fh *vfh = file->private_data;
 140 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 141         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
 142 #endif
 143
 144         switch (cmd) {
 145         case VIDIOC_QUERYCTRL:
 146                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
 147
 148         case VIDIOC_QUERYMENU:
 149                 return v4l2_querymenu(vfh->ctrl_handler, arg);
 150
 151         case VIDIOC_G_CTRL:
 152                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
 153
 154         case VIDIOC_S_CTRL:
 155                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
 156
 157         case VIDIOC_G_EXT_CTRLS:
 158                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
 159
 160         case VIDIOC_S_EXT_CTRLS:
 161                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
 162
 163         case VIDIOC_TRY_EXT_CTRLS:
 164                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
 165
 166         case VIDIOC_DQEVENT:
 167                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 168                         return -ENOIOCTLCMD;
 169
 170                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
 171
 172         case VIDIOC_SUBSCRIBE_EVENT:
 173                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
 174
 175         case VIDIOC_UNSUBSCRIBE_EVENT:
 176                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
 177 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 178         case VIDIOC_SUBDEV_G_FMT: {
 179                 struct v4l2_subdev_format *format = arg;
 180
 181                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 182                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 183                         return -EINVAL;
 184
 185                 if (format->pad >= sd->entity.num_pads)
 186                         return -EINVAL;
 187
 188                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
 189         }
 190
 191         case VIDIOC_SUBDEV_S_FMT: {
 192                 struct v4l2_subdev_format *format = arg;
 193
 194                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 195                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 196                         return -EINVAL;
 197
 198                 if (format->pad >= sd->entity.num_pads)
 199                         return -EINVAL;
 200
 201                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
 202         }
 203
 204         case VIDIOC_SUBDEV_G_CROP: {
 205                 struct v4l2_subdev_crop *crop = arg;
 206
 207                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 208                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 209                         return -EINVAL;
 210
 211                 if (crop->pad >= sd->entity.num_pads)
 212                         return -EINVAL;
 213
 214                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
 215         }
 216
 217         case VIDIOC_SUBDEV_S_CROP: {
 218                 struct v4l2_subdev_crop *crop = arg;
 219
 220                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 221                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 222                         return -EINVAL;
 223
 224                 if (crop->pad >= sd->entity.num_pads)
 225                         return -EINVAL;
 226
 227                 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
 228         }
 229
 230         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 231                 struct v4l2_subdev_mbus_code_enum *code = arg;
 232
 233                 if (code->pad >= sd->entity.num_pads)
 234                         return -EINVAL;
 235
 236                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
 237                                         code);
 238         }
 239
 240         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 241                 struct v4l2_subdev_frame_size_enum *fse = arg;
 242
 243                 if (fse->pad >= sd->entity.num_pads)
 244                         return -EINVAL;
 245
 246                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
 247                                         fse);
 248         }
 249
 250         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
 251                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 252
 253         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
 254                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 255
 256         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 257                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 258
 259                 if (fie->pad >= sd->entity.num_pads)
 260                         return -EINVAL;
 261
 262                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
 263                                         fie);
 264         }
 265 #endif
 266         default:
 267                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 268         }
 269
 270         return 0;
 271 }
 272
 273 static long subdev_ioctl(struct file *file, unsigned int cmd,
 274         unsigned long arg)
 275 {
 276         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
 277 }
 278
 279 static unsigned int subdev_poll(struct file *file, poll_table *wait)
 280 {
 281         struct video_device *vdev = video_devdata(file);
 282         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 283         struct v4l2_fh *fh = file->private_data;
 284
 285         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 286                 return POLLERR;
 287
 288         poll_wait(file, &fh->wait, wait);
 289
 290         if (v4l2_event_pending(fh))
 291                 return POLLPRI;
 292
 293         return 0;
 294 }
 295
 296 const struct v4l2_file_operations v4l2_subdev_fops = {
 297         .owner = THIS_MODULE,
 298         .open = subdev_open,
 299         .unlocked_ioctl = subdev_ioctl,
 300         .release = subdev_close,
 301         .poll = subdev_poll,
 302 };
 303
 304 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 305 {
 306         INIT_LIST_HEAD(&sd->list);
 307         BUG_ON(!ops);
 308         sd->ops = ops;
 309         sd->v4l2_dev = NULL;
 310         sd->flags = 0;
 311         sd->name[0] = '\0';
 312         sd->grp_id = 0;
 313         sd->dev_priv = NULL;
 314         sd->host_priv = NULL;
 315 #if defined(CONFIG_MEDIA_CONTROLLER)
 316         sd->entity.name = sd->name;
 317         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
 318 #endif
 319 }
 320 EXPORT_SYMBOL(v4l2_subdev_init);