-/**
- * adis16300_spi_read_burst() - read all data registers
- * @dev: device associated with child of actual device (iio_dev or iio_trig)
- * @rx: somewhere to pass back the value read (min size is 24 bytes)
- **/
-int adis16300_spi_read_burst(struct device *dev, u8 *rx)
-{
- struct spi_message msg;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct adis16300_state *st = iio_dev_get_devdata(indio_dev);
- u32 old_speed_hz = st->us->max_speed_hz;
- int ret;
-
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 2,
- .cs_change = 0,
- }, {
- .rx_buf = rx,
- .bits_per_word = 8,
- .len = 18,
- .cs_change = 0,
- },
- };
-
- mutex_lock(&st->buf_lock);
- st->tx[0] = ADIS16300_READ_REG(ADIS16300_GLOB_CMD);
- st->tx[1] = 0;
-
- spi_message_init(&msg);
- spi_message_add_tail(&xfers[0], &msg);
- spi_message_add_tail(&xfers[1], &msg);
-
- st->us->max_speed_hz = min(ADIS16300_SPI_BURST, old_speed_hz);
- spi_setup(st->us);
-
- ret = spi_sync(st->us, &msg);
- if (ret)
- dev_err(&st->us->dev, "problem when burst reading");
-
- st->us->max_speed_hz = old_speed_hz;
- spi_setup(st->us);
- mutex_unlock(&st->buf_lock);
- return ret;
-}
-