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iio: adis: Support different burst sizes

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Add burst_max_len to `adis_burst`. This is useful for devices which
support different burst modes with different sizes. The buffer to be
used in the spi transfer is allocated with this variable making sure
that has space for all burst modes. The spi transfer length should hold
the "real" burst length depending on the current burst mode configured
in the device.

Moreover, `extra_len` in `adis_burst` is made const and it should
contain the smallest extra length necessary for a burst transfer. In
`struct adis` was added a new `burst_extra_len` that should hold the
extra bytes needed depending on the device instance being used.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sá
2020-04-13 10:24:43 +02:00
committed by Jonathan Cameron
parent b9c5eec725
commit 3e04cb60e8
3 changed files with 17 additions and 7 deletions
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13
drivers/iio/imu/adis_buffer.c
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@@ -23,25 +23,30 @@ 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;
unsigned int burst_length, burst_max_length;
u8 *tx;
/* All but the timestamp channel */
burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
burst_length += adis->burst->extra_len;
burst_length += adis->burst->extra_len + adis->burst_extra_len;
if (adis->burst->burst_max_len)
burst_max_length = adis->burst->burst_max_len;
else
burst_max_length = burst_length;
adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
if (!adis->xfer)
return -ENOMEM;
adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
adis->buffer = kzalloc(burst_max_length + sizeof(u16), GFP_KERNEL);
if (!adis->buffer) {
kfree(adis->xfer);
adis->xfer = NULL;
return -ENOMEM;
}
tx = adis->buffer + burst_length;
tx = adis->buffer + burst_max_length;
tx[0] = ADIS_READ_REG(adis->burst->reg_cmd);
tx[1] = 0;