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static int em28xx_gpio_write(enum v4l2_tuner_type mode, void *priv, int ptr){
        struct em28xx *dev=(struct em28xx*)priv;
        int ret;
        char gpio[6];
        dev->mode=mode;
        switch(dev->model){
                case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2:
                        gpio[0]=0x2d;
                        gpio[1]=0x3d;
                        gpio[2]=0x2e;
                        gpio[3]=0x3e;
                        gpio[4]=0x08;
                        gpio[5]=0x0c;
                        break;
                case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900:
                        gpio[0]=0x2d;
                        gpio[1]=0x3d;
                        gpio[2]=0x2e;
                        gpio[3]=0x3e;
                        gpio[4]=0x00;
                        gpio[5]=0x00;
                        break;
                case EM2880_BOARD_TERRATEC_HYBRID_XS:
                case EM2870_BOARD_TERRATEC_XS:
                case EM2880_BOARD_KWORLD_DVB_310U:
                case EM2870_BOARD_KWORLD_350U:
                        gpio[0]=0x6d;
                        gpio[1]=0x7d;
                        gpio[2]=0x6e;
                        gpio[3]=0x7e;
                        gpio[4]=0x00;
                        gpio[5]=0x00;
                        break;
                case EM2880_BOARD_MSI_DIGIVOX_AD:
                        gpio[0]=0x69;
                        gpio[1]=0x79;
                        gpio[2]=0x6a;
                        gpio[3]=0x7a;
                        gpio[4]=0x00;
                        gpio[5]=0x00;
                        break;
                case EM2881_BOARD_DNT_DA2_HYBRID:
                case EM2881_BOARD_PINNACLE_HYBRID_PRO:
                        gpio[0]=0x6d;
                        gpio[1]=0x7d;
                        gpio[2]=0x6e;
                        gpio[3]=0x7e;
                        gpio[4]=0x08;
                        gpio[5]=0x0c;
                        break;
                case EM2880_BOARD_TERRATEC_HYBRID_XS_FR:
                case EM2880_BOARD_TERRATEC_HYBRID_XS_FR_2:
                        gpio[0]=0x6d;
                        gpio[1]=0x7d;
                        gpio[2]=0x6e;
                        gpio[3]=0x7e;
                        gpio[4]=0x00;
                        gpio[5]=0x00;
                        break;
                case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950:
                        gpio[0]=0x2d;
                        gpio[1]=0x3d;
                        gpio[2]=0x2e;
                        gpio[3]=0x3e;
                        gpio[4]=0x00;
                        gpio[5]=0x00;

                        break;

                default:
                        return -EINVAL;
        }
        /* not sure about the delays here we have no specs about this */
        if(ptr==0 || ptr==1){
                switch(mode){
                        case V4L2_TUNER_ANALOG_TV:
                                if(ptr==0){
                                        dev->em28xx_write_regs_req(dev,0x00,0x48,"\x00",1);
                                        dev->em28xx_write_regs_req(dev,0x00,0x12,"\x67",1);
                                        if(gpio[4]){
                                                ret = dev->em28xx_write_regs(dev,0x04,&gpio[4],1);
                                                msleep(140);
                                        }
                                }
                                msleep(6);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[0], 1);
                                msleep(10);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[1], 1);
                                msleep(5);
                                break;
                        case V4L2_TUNER_DVBT_TV:
                        case V4L2_TUNER_DVBC_TV:
                        case V4L2_TUNER_ATSC_TV:
                                if(ptr==0){
                                        dev->em28xx_write_regs_req(dev,0x00,0x48,"\x00",1);
                                        dev->em28xx_write_regs_req(dev,0x00,0x12,"\x67",1);
                                        if(gpio[4]){
                                                ret = dev->em28xx_write_regs(dev,0x04,&gpio[4],1);
                                                msleep(140);
                                        }
                                }
                                msleep(6);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[0], 1);
                                msleep(10);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[1], 1);
                                msleep(5);
                                break;
                        case V4L2_TUNER_DVBT_TV:
                        case V4L2_TUNER_DVBC_TV:
                        case V4L2_TUNER_ATSC_TV:
                                if(ptr==0){
                                        dev->em28xx_write_regs_req(dev,0x00,0x48,"\x00",1);
                                        dev->em28xx_write_regs_req(dev,0x00,0x12,"\x37",1);
                                        if(gpio[5]){
                                                ret = dev->em28xx_write_regs(dev,0x04,&gpio[5],1);
                                                msleep(140);
                                        }
                                }

                                msleep(6);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[2], 1);
                                msleep(6);
                                ret = dev->em28xx_write_regs(dev, 0x08, &gpio[3], 1);
                                msleep(6);
                                /* thanks for no specs here grr! -- Markus */
                                if (ptr==0 && (dev->model==EM2880_BOARD_TERRATEC_HYBRID_XS_FR ||
                                    dev->model==EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950)){
                                        ret = dev->em28xx_write_regs(dev,0x04,"\x04",1);
                                        msleep(10);
                                        ret = dev->em28xx_write_regs(dev,0x04,"\x0c",1);
                                        msleep(10);
                                }

                                break;
                        default:
                                printk("em28xx-i2c.c: tuner mode unsupported!\n");
                                return -EINVAL;
                }
        } else
                if(dev->dvb_dev && ptr==2 && (mode==V4L2_TUNER_DVBC_TV || mode==V4L2_TUNER_DVBT_TV|| mode==V4L2_TUNER_ATSC_TV)){
                        if (dev->dvb_dev->demod_init)
                                dev->dvb_dev->demod_init(dev->dvb_dev->frontend);
                }
        return 0;
}