• AD8366
• ADA4961
• ADL5240
• HMC271
• HMC1119

• AD8366-EVALZ

This is a Linux industrial I/O (IIO) subsystem driver, targeting serial interface VGA/PGA amplifiers. The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2c, spi, etc). See IIO for more information.

Depending on the IC used, you may need to set the modalias accordingly, matching your part name. It may also required to adjust max_speed_hz. Please consult the datasheet, for maximum spi clock supported by the device in question.

static struct spi_board_info board_spi_board_info[] __initdata = {
#if defined(CONFIG_AD8366) || defined(CONFIG_AD8366_MODULE)
	{
		.modalias = "ad8366",
		.max_speed_hz = 1000000,     /* max spi clock (SCK) speed in HZ */
		.bus_num = 0,
		.chip_select = 6,
		.platform_data = &ad8366_pdata_lpc, /* spi_driver specific config */
		.mode = SPI_MODE_0, /* optional set SPI_3WIRE */
	},
};

static int __init board_init(void)
{
	[--snip--]
 
	spi_register_board_info(board_spi_board_info, ARRAY_SIZE(board_spi_board_info));
 
	[--snip--]
 
	return 0;
}
arch_initcall(board_init);

Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”)

Linux Kernel Configuration
	Device Drivers  --->
		<*>     Industrial I/O support --->
		    --- Industrial I/O support
				Amplifiers  --->
					<*> Analog Devices AD8366 VGA

/sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain

Hardware applied gain factor. If shared across all channels, _hardwaregain is used.

root:/> cat out_voltage0_hardwaregain
4.500000 dB

root:/> echo 10 > out_voltage0_hardwaregain
root:/> cat out_voltage0_hardwaregain
9.813000 dB