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| author | Alexandru Ardelean <alexandru.ardelean@analog.com> | 2019-03-22 23:44:40 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2019-04-04 22:20:26 +0300 |
| commit | 0e92e2d036232da1543599dc9b7acc1ce4289d1b (patch) | |
| tree | ef02c10668d99b92b36887c42e6d0f68caea41f9 /drivers/iio/imu/adis_buffer.c | |
| parent | 5075e0720d93a84e059759c5d8c6a78613d0face (diff) | |
| download | linux-0e92e2d036232da1543599dc9b7acc1ce4289d1b.tar.xz | |
iio: imu: adis16400: move burst logic to ADIS lib
This change has been done separately, so that it's easier to visualize the
changed logic in the adis_scan_update() function.
Most of the function in this `adis16400_update_scan_mode()` that deals with
burst-mode will be re-used in the ADIS16480, but with different parameters.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/imu/adis_buffer.c')
| -rw-r--r-- | drivers/iio/imu/adis_buffer.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c index 76643c5571aa..3a7c970568dc 100644 --- a/drivers/iio/imu/adis_buffer.c +++ b/drivers/iio/imu/adis_buffer.c @@ -20,6 +20,43 @@ #include <linux/iio/triggered_buffer.h> #include <linux/iio/imu/adis.h> +static int adis_update_scan_mode_burst(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct adis *adis = iio_device_get_drvdata(indio_dev); + unsigned int burst_length; + u8 *tx; + + /* All but the timestamp channel */ + burst_length = (indio_dev->num_channels - 1) * sizeof(u16); + burst_length += adis->burst->extra_len; + + adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL); + if (!adis->xfer) + return -ENOMEM; + + adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL); + if (!adis->buffer) + return -ENOMEM; + + tx = adis->buffer + burst_length; + tx[0] = ADIS_READ_REG(adis->burst->reg_cmd); + tx[1] = 0; + + adis->xfer[0].tx_buf = tx; + adis->xfer[0].bits_per_word = 8; + adis->xfer[0].len = 2; + adis->xfer[1].rx_buf = adis->buffer; + adis->xfer[1].bits_per_word = 8; + adis->xfer[1].len = burst_length; + + spi_message_init(&adis->msg); + spi_message_add_tail(&adis->xfer[0], &adis->msg); + spi_message_add_tail(&adis->xfer[1], &adis->msg); + + return 0; +} + int adis_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { @@ -32,6 +69,9 @@ int adis_update_scan_mode(struct iio_dev *indio_dev, kfree(adis->xfer); kfree(adis->buffer); + if (adis->burst && adis->burst->en) + return adis_update_scan_mode_burst(indio_dev, scan_mask); + scan_count = indio_dev->scan_bytes / 2; adis->xfer = kcalloc(scan_count + 1, sizeof(*adis->xfer), GFP_KERNEL); |