/***************************************************************************//**
* @brief Writes a value to the selected register.
*
* @param registerAddress - The address of the register to write to.
* @param registerValue - The value to write to the register.
*
* @return Returns 0 in case of success or negative error code.
*******************************************************************************/
int32_t ad9523_write(uint32_t registerAddress,
uint32_t registerValue)
{
uint32_t i = 0;
int32_t ret = -1;
uint16_t regAddr = 0;
regAddr = (registerAddress & 0x1FFF);
for(i = 0; i < AD9523_TRANSF_LEN(registerAddress); i++)
{
ret = SPI_Write(SPI_SEL_AD9523, regAddr, (registerValue >> ((AD9523_TRANSF_LEN(registerAddress) - i - 1) * 8)) & 0xFF);
if(ret < 0)
return ret;
regAddr--;
}
return ret;
}
/***************************************************************************//**
* @brief Reads the value of the selected register.
*
* @param registerAddress - The address of the register to read.
*
* @return registerValue - The register's value or negative error code.
*******************************************************************************/
int32_t ad9523_read(uint32_t registerAddress)
{
uint16_t regAddr = 0;
uint32_t registerValue = 0;
uint32_t registerValue1 = 0;
int32_t ret;
uint32_t i = 0;
regAddr = 0x8000 + (registerAddress & 0x1FFF);
for(i = 0; i < AD9523_TRANSF_LEN(registerAddress); i++)
{
ret = SPI_Read(SPI_SEL_AD9523, regAddr, ®isterValue1);
if(ret < 0)
return ret;
regAddr--;
registerValue <<= 8;
registerValue |= registerValue1;
}
return (int32_t)registerValue;
}
static int ad9523_read(struct iio_dev *indio_dev, unsigned addr)
{
struct ad9523_state *st = iio_priv(indio_dev);
int ret;
/* We encode the register size 1..3 bytes into the register address.
* On transfer we get the size from the register datum, and make sure
* the result is properly aligned.
*/
struct spi_transfer t[] = {
{
.tx_buf = &st->data[0].d8[2],
.len = 2,
}, {
.rx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)],
.len = AD9523_TRANSF_LEN(addr),
},
};
st->data[0].d32 = cpu_to_be32(AD9523_READ |
AD9523_CNT(AD9523_TRANSF_LEN(addr)) |
AD9523_ADDR(addr));
ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
if (ret < 0)
dev_err(&indio_dev->dev, "read failed (%d)", ret);
else
ret = be32_to_cpu(st->data[1].d32) & (0xFFFFFF >>
(8 * (3 - AD9523_TRANSF_LEN(addr))));
