This page documents ioctl used to control tuner in Sony's NW(Z) series of players.

The source of information is: 1) disassembly of icx_si470x_radio_tuner.ko kernel module extracted from NWZ-E474 2) disassembly of radio_test binary extracted from NWZ-E474 3) linux kernel sources published by Sony

There are two classes of IOCTLs implemented by the tuner drive - generic v4l2 compatible (VIDIOC_QUERYCAP, VIDIOC_G_TUNER, VIDIO_S_TUNER, VIDIOC_S_FREQUENCY), custom, private to access lowlevel functions of the tuner chip. The private interface is NOT documented in kernel sources released by Sony.

IOCTL name	IOCTL value	comment
VIDIOC_PRI_INITREG	0xC02C7629	si470x_initialize()
VIDIOC_PRI_PUT_REG	0xC02C762A	write single tuner's register
VIDIOC_PRI_GET_REG	0xC02C762B	get single tuner's register
VIDIOC_PRI_GET_REGALL	0xC02C762C	returns 0x20 bytes of tuner's registers
VIDIOC_PRI_SETFREQ	0xC02C762D
VIDIOC_PRI_RESET	0x402C762E	toggles GPIO line
VIDIOC_PRI_GPIO2_ON	0x402C762F	sets si470x gpio2 line high
VIDIOC_PRI_GPIO2_OFF	0x402C7630	sets si470x gpio2 line low
VIDIOC_PRI_G_TUNER_RAW	0xC02C7631	some additional data

-- MarcinBukat - 10 Jan 2017