case VIDIOC_G_TUNER:
        {
                struct v4l2_tuner *t = arg;
-               int status = 0;
 
                if (0 != t->index)
                        return -EINVAL;
 
                memset(t, 0, sizeof(*t));
                strcpy(t->name, "Tuner");
-               t->type = V4L2_TUNER_ANALOG_TV;
-               t->capability = V4L2_TUNER_CAP_NORM;
-               t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
-/*             t->signal = 0xffff;*/
-/*             em28xx_i2c_call_clients(dev,VIDIOC_G_TUNER,t);*/
-               /* No way to get signal strength? */
                mutex_lock(&dev->lock);
-               em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
-                                       &status);
+               /* let clients fill in the remainder of this struct */
+               em28xx_i2c_call_clients(dev, cmd, t);
                mutex_unlock(&dev->lock);
-               t->signal =
-                       (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
-
                em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
                                t->afc);
                return 0;
        case VIDIOC_S_TUNER:
        {
                struct v4l2_tuner *t = arg;
-               int status = 0;
 
                if (0 != t->index)
                        return -EINVAL;
-               memset(t, 0, sizeof(*t));
-               strcpy(t->name, "Tuner");
-               t->type = V4L2_TUNER_ANALOG_TV;
-               t->capability = V4L2_TUNER_CAP_NORM;
-               t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
-/*             t->signal = 0xffff; */
-               /* No way to get signal strength? */
                mutex_lock(&dev->lock);
-               em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
-                                       &status);
+               /* let clients handle this */
+               em28xx_i2c_call_clients(dev, cmd, t);
                mutex_unlock(&dev->lock);
-               t->signal =
-                       (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
-
-               em28xx_videodbg("VIDIO_S_TUNER: signal=%x, afc=%x\n",
-                               t->signal, t->afc);
                return 0;
        }
        case VIDIOC_G_FREQUENCY:
 
 
        case 0:
        case VIDIOC_INT_RESET:
-       case DECODER_INIT:
                tvp5150_reset(c);
                break;
        case VIDIOC_S_STD:
 #endif
 
        case VIDIOC_LOG_STATUS:
-       case DECODER_DUMP:
                dump_reg(c);
                break;
 
-       case DECODER_GET_CAPABILITIES:
+       case VIDIOC_G_TUNER:
                {
-                       struct video_decoder_capability *cap = arg;
-
-                       cap->flags = VIDEO_DECODER_PAL |
-                           VIDEO_DECODER_NTSC |
-                           VIDEO_DECODER_SECAM |
-                           VIDEO_DECODER_AUTO | VIDEO_DECODER_CCIR;
-                       cap->inputs = 3;
-                       cap->outputs = 1;
-                       break;
-               }
-       case DECODER_GET_STATUS:
-               {
-                       int *iarg = arg;
-                       int status;
-                       int res=0;
-                       status = tvp5150_read(c, 0x88);
-                       if(status&0x08){
-                               res |= DECODER_STATUS_COLOR;
-                       }
-                       if(status&0x04 && status&0x02){
-                               res |= DECODER_STATUS_GOOD;
-                       }
-                       *iarg=res;
-                       break;
-               }
-
-       case DECODER_SET_GPIO:
-               break;
-
-       case DECODER_SET_VBI_BYPASS:
-               break;
-
-       case DECODER_SET_NORM:
-               {
-                       int *iarg = arg;
-
-                       switch (*iarg) {
-
-                       case VIDEO_MODE_NTSC:
-                               break;
-
-                       case VIDEO_MODE_PAL:
-                               break;
-
-                       case VIDEO_MODE_SECAM:
-                               break;
-
-                       case VIDEO_MODE_AUTO:
-                               break;
-
-                       default:
-                               return -EINVAL;
-
-                       }
-                       decoder->norm = *iarg;
-                       break;
-               }
-       case DECODER_SET_INPUT:
-               {
-                       int *iarg = arg;
-                       if (*iarg < 0 || *iarg > 3) {
-                               return -EINVAL;
-                       }
-
-                       decoder->input = *iarg;
-                       tvp5150_selmux(c, decoder->input);
-
-                       break;
-               }
-       case DECODER_SET_OUTPUT:
-               {
-                       int *iarg = arg;
-
-                       /* not much choice of outputs */
-                       if (*iarg != 0) {
-                               return -EINVAL;
-                       }
-                       break;
-               }
-       case DECODER_ENABLE_OUTPUT:
-               {
-                       int *iarg = arg;
-
-                       decoder->enable = (*iarg != 0);
-
-                       tvp5150_selmux(c, decoder->input);
+                       struct v4l2_tuner *vt = arg;
+                       int status = tvp5150_read(c, 0x88);
 
+                       vt->signal = ((status & 0x04) && (status & 0x02)) ? 0xffff : 0x0;
                        break;
                }
        case VIDIOC_QUERYCTRL:
                        return -EINVAL;
                }
 
-       case DECODER_SET_PICTURE:
-               {
-                       struct video_picture *pic = arg;
-                       if (decoder->bright != pic->brightness) {
-                               /* We want 0 to 255 we get 0-65535 */
-                               decoder->bright = pic->brightness;
-                               tvp5150_write(c, TVP5150_BRIGHT_CTL,
-                                             decoder->bright >> 8);
-                       }
-                       if (decoder->contrast != pic->contrast) {
-                               /* We want 0 to 255 we get 0-65535 */
-                               decoder->contrast = pic->contrast;
-                               tvp5150_write(c, TVP5150_CONTRAST_CTL,
-                                             decoder->contrast >> 8);
-                       }
-                       if (decoder->sat != pic->colour) {
-                               /* We want 0 to 255 we get 0-65535 */
-                               decoder->sat = pic->colour;
-                               tvp5150_write(c, TVP5150_SATURATION_CTL,
-                                             decoder->contrast >> 8);
-                       }
-                       if (decoder->hue != pic->hue) {
-                               /* We want -128 to 127 we get 0-65535 */
-                               decoder->hue = pic->hue;
-                               tvp5150_write(c, TVP5150_HUE_CTL,
-                                             (decoder->hue - 32768) >> 8);
-                       }
-                       break;
-               }
        default:
                return -EINVAL;
        }