ADG2128 no-OS Driver

See drivers/switch/adg2128 (doxygen) for the Doxygen documentation.

Supported Devices

Overview

The ADG2128 is an I2C-compatible CMOS analog crosspoint switch with an 8 x 12 matrix, providing 96 bidirectional switch channels. It features double-buffered input logic, allowing simultaneous update of multiple switches via the LDSW command. The I2C interface supports standard, full-speed, and high-speed (3.4 MHz) operation.

The device offers up to 300 MHz bandwidth and a maximum on resistance of 35 ohms, with low quiescent current (less than 20 uA). It operates with dual +/-5 V or single +12 V supplies and is housed in a 32-lead LFCSP package. A RESET option is available to disable all switches at power-on or manually.

Applications

  • AV switching in TV

  • Automotive infotainment

  • AV receivers

  • CCTV

  • Ultrasound applications

  • KVM switching

  • Telecom applications

  • Test equipment/instrumentation

  • PBX systems

ADG2128 no-OS IIO Support

The ADG2128 IIO driver provides support for interfacing IIO clients through libiio. It exposes the device's I2C register interface through the IIO debug register read/write mechanism.

ADG2128 IIO Device Configuration

Initialization

The adg2128_iio_init function initializes the ADG2128 IIO device. It takes an already initialized I2C descriptor as input, allocates memory for the device structure, and associates it with the IIO device definition that provides debug register read and write capabilities.

Removal

The adg2128_iio_remove function frees the allocated resources for the ADG2128 IIO device.

ADG2128 IIO Driver Initialization Example

struct adg2128_iio_dev *adg2128_iio;
struct no_os_i2c_desc *i2c_desc;

struct no_os_i2c_init_param i2c_ip = {
        .device_id = I2C_DEVICE_ID,
        .max_speed_hz = 100000,
        .slave_address = 0x70,
        .platform_ops = I2C_OPS,
        .extra = I2C_EXTRA,
};

ret = no_os_i2c_init(&i2c_desc, &i2c_ip);
if (ret)
        goto error;

ret = adg2128_iio_init(&adg2128_iio, i2c_desc);
if (ret)
        goto error;

struct iio_app_device devices[] = {
        {
                .name = "adg2128",
                .dev = adg2128_iio,
                .dev_descriptor = adg2128_iio->iio_dev,
        },
};

struct iio_app_desc *app;
struct iio_app_init_param app_init_param = { 0 };

app_init_param.devices = devices;
app_init_param.nb_devices = NO_OS_ARRAY_SIZE(devices);
app_init_param.uart_init_params = uart_ip;

ret = iio_app_init(&app, app_init_param);
if (ret)
        goto error;

return iio_app_run(app);