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
 178 #ifdef CONFIG_VIDEO_ADV_DEBUG
 179         case VIDIOC_DBG_G_REGISTER:
 180         {
 181                 struct v4l2_dbg_register *p = arg;
 182
 183                 if (!capable(CAP_SYS_ADMIN))
 184                         return -EPERM;
 185                 return v4l2_subdev_call(sd, core, g_register, p);
 186         }
 187         case VIDIOC_DBG_S_REGISTER:
 188         {
 189                 struct v4l2_dbg_register *p = arg;
 190
 191                 if (!capable(CAP_SYS_ADMIN))
 192                         return -EPERM;
 193                 return v4l2_subdev_call(sd, core, s_register, p);
 194         }
 195 #endif
 196 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 197         case VIDIOC_SUBDEV_G_FMT: {
 198                 struct v4l2_subdev_format *format = arg;
 199
 200                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 201                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 202                         return -EINVAL;
 203
 204                 if (format->pad >= sd->entity.num_pads)
 205                         return -EINVAL;
 206
 207                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
 208         }
 209
 210         case VIDIOC_SUBDEV_S_FMT: {
 211                 struct v4l2_subdev_format *format = arg;
 212
 213                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
 214                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 215                         return -EINVAL;
 216
 217                 if (format->pad >= sd->entity.num_pads)
 218                         return -EINVAL;
 219
 220                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
 221         }
 222
 223         case VIDIOC_SUBDEV_G_CROP: {
 224                 struct v4l2_subdev_crop *crop = arg;
 225
 226                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 227                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 228                         return -EINVAL;
 229
 230                 if (crop->pad >= sd->entity.num_pads)
 231                         return -EINVAL;
 232
 233                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
 234         }
 235
 236         case VIDIOC_SUBDEV_S_CROP: {
 237                 struct v4l2_subdev_crop *crop = arg;
 238
 239                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
 240                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 241                         return -EINVAL;
 242
 243                 if (crop->pad >= sd->entity.num_pads)
 244                         return -EINVAL;
 245
 246                 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
 247         }
 248
 249         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
 250                 struct v4l2_subdev_mbus_code_enum *code = arg;
 251
 252                 if (code->pad >= sd->entity.num_pads)
 253                         return -EINVAL;
 254
 255                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
 256                                         code);
 257         }
 258
 259         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
 260                 struct v4l2_subdev_frame_size_enum *fse = arg;
 261
 262                 if (fse->pad >= sd->entity.num_pads)
 263                         return -EINVAL;
 264
 265                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
 266                                         fse);
 267         }
 268
 269         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
 270                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
 271
 272         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
 273                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
 274
 275         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
 276                 struct v4l2_subdev_frame_interval_enum *fie = arg;
 277
 278                 if (fie->pad >= sd->entity.num_pads)
 279                         return -EINVAL;
 280
 281                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
 282                                         fie);
 283         }
 284 #endif
 285         default:
 286                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 287         }
 288
 289         return 0;
 290 }
 291
 292 static long subdev_ioctl(struct file *file, unsigned int cmd,
 293         unsigned long arg)
 294 {
 295         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
 296 }
 297
 298 static unsigned int subdev_poll(struct file *file, poll_table *wait)
 299 {
 300         struct video_device *vdev = video_devdata(file);
 301         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 302         struct v4l2_fh *fh = file->private_data;
 303
 304         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
 305                 return POLLERR;
 306
 307         poll_wait(file, &fh->wait, wait);
 308
 309         if (v4l2_event_pending(fh))
 310                 return POLLPRI;
 311
 312         return 0;
 313 }
 314
 315 const struct v4l2_file_operations v4l2_subdev_fops = {
 316         .owner = THIS_MODULE,
 317         .open = subdev_open,
 318         .unlocked_ioctl = subdev_ioctl,
 319         .release = subdev_close,
 320         .poll = subdev_poll,
 321 };
 322
 323 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 324 {
 325         INIT_LIST_HEAD(&sd->list);
 326         BUG_ON(!ops);
 327         sd->ops = ops;
 328         sd->v4l2_dev = NULL;
 329         sd->flags = 0;
 330         sd->name[0] = '\0';
 331         sd->grp_id = 0;
 332         sd->dev_priv = NULL;
 333         sd->host_priv = NULL;
 334 #if defined(CONFIG_MEDIA_CONTROLLER)
 335         sd->entity.name = sd->name;
 336         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
 337 #endif
 338 }
 339 EXPORT_SYMBOL(v4l2_subdev_init);