====== Si2168 ======
These command are reversed from the driver of a usb tuner i own

By knowing message header and function name it should be easier to understand usbsnoop log
|cmd(wlen)|function|
|0x12(3)|Si2168B_L1_CONFIG_PINS|
|0x17(2)|Si2168B_L1_RSSI_ADC|
|0x30(2)|Si2168B_L1_SCAN_STATUS|
|0x31(8)|Si2168B_L1_SCAN_CTRL|
|0x52(3)|Si2168B_L1_DVBT2_PLP_SELECT|
|0x81(2)|Si2168B_L1_DD_CBER|
|0x82(2)|Si2168B_L1_DD_BER|
|0x83(2)|Si2168B_L1_DD_PER|
|0x84(2)|Si2168B_L1_DD_UNCOR|
|0x85(1)|Si2168B_L1_DD_RESTART|
|0x86(2)|Si2168B_L1_DD_FER|
|0x87(2)|Si2168B_L1_DD_STATUS|
|0x88(5)|Si2168B_L1_DD_MP_DEFAULTS|
|0x89(6)|Si2168B_L1_DD_EXT_AGC_TER|
|0x8b(2)|Si2168B_L1_DD_SSI_SQI|
|0x8e(8)|Si2168B_L1_DD_SET_REG|
|0x8f(4)|Si2168B_L1_DD_GET_REG|
|0x90(2)|Si2168B_L1_DVBC_STATUS|
|0x98(2)|Si2168B_L1_MCNS_STATUS|
|0xa0(2)|Si2168B_L1_DVBT_STATUS|
|0xa1(1)|Si2168B_L1_DVBT_TPS_EXTRA|
|0xb9(8)|Si2168B_L1_DOWNLOAD_DATASET_CONTINUE|
|0xb8(8)|Si2168B_L1_DOWNLOAD_DATASET_START|
|0xc0(3)|Si2168B_L1_I2C_PASSTHROUGH|
|0xc0(8)|Si2168B_L1_POWER_UP|
|0xc0(7)|Si2168B_L1_SPI_LINK|
|0xc0(4)|Si2168B_L1_SPI_PASSTHROUGH|
|0xc0(d)|Si2168B_L1_START_CLK|
|0xc0(3)|Si2157_L1_CONFIG_CLOCKS|
|0xc0(a)|Si2157_L1_POWER_DOWN_HW|
|0xc0(f)|Si2157_L1_POWER_UP|