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| author | Alexandru Ardelean <alexandru.ardelean@analog.com> | 2019-03-22 22:44:39 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2019-04-04 20:20:24 +0100 |
| commit | 5075e0720d93a84e059759c5d8c6a78613d0face (patch) | |
| tree | ecdea898d086f2bcf97cab74966cb5cb6b26c6c5 /drivers/iio/imu | |
| parent | 74878d4fa816443716bd8adf4f9f6986f5c6f256 (diff) | |
| download | linux-5075e0720d93a84e059759c5d8c6a78613d0face.tar.bz2 | |
iio: imu: adis: generalize burst mode support
Some variants in the ADIS16400 family support burst mode. This mechanism is
implemented in the `adis16400_buffer.c` file.
Some variants in ADIS16480 are also adding burst mode, which is
functionally similar to ADIS16400, but with different parameters. To get
there, a `adis_burst` struct is added to parametrize certain bits of the
SPI communication to setup: the register that triggers burst-mode, and the
extra-data-length that needs be accounted for when building the bust-length
buffer.
The trigger handler cannot be made generic, since it's very specific to
each ADIS164XX family.
A future enhancement of this `adis_burst` mode will be the possibility to
enable/disable burst-mode. For the ADIS16400 family it's hard-coded to on
by default. But for ADIS16480 there will be a need to disable this.
When that will be implemented, both ADIS16400 & ADIS16480 will have the
burst-mode enable-able/disable-able.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/imu')
| -rw-r--r-- | drivers/iio/imu/adis16400_buffer.c | 7 | ||||
| -rw-r--r-- | drivers/iio/imu/adis16400_core.c | 8 |
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/iio/imu/adis16400_buffer.c b/drivers/iio/imu/adis16400_buffer.c index 268349eb51c7..199bd72348eb 100644 --- a/drivers/iio/imu/adis16400_buffer.c +++ b/drivers/iio/imu/adis16400_buffer.c @@ -22,7 +22,7 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev, unsigned int burst_length; u8 *tx; - if (st->variant->flags & ADIS16400_NO_BURST) + if (!adis->burst || !adis->burst->en) return adis_update_scan_mode(indio_dev, scan_mask); kfree(adis->xfer); @@ -30,8 +30,7 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev, /* All but the timestamp channel */ burst_length = (indio_dev->num_channels - 1) * sizeof(u16); - if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) - burst_length += sizeof(u16); + burst_length += adis->burst->extra_len; adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL); if (!adis->xfer) @@ -42,7 +41,7 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev, return -ENOMEM; tx = adis->buffer + burst_length; - tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD); + tx[0] = ADIS_READ_REG(adis->burst->reg_cmd); tx[1] = 0; adis->xfer[0].tx_buf = tx; diff --git a/drivers/iio/imu/adis16400_core.c b/drivers/iio/imu/adis16400_core.c index f9cb9e11e636..093c809dae50 100644 --- a/drivers/iio/imu/adis16400_core.c +++ b/drivers/iio/imu/adis16400_core.c @@ -146,6 +146,11 @@ enum adis16400_chip_variant { ADIS16448, }; +static struct adis_burst adis16400_burst = { + .en = true, + .reg_cmd = ADIS16400_GLOB_CMD, +}; + static int adis16334_get_freq(struct adis16400_state *st) { int ret; @@ -972,6 +977,9 @@ static int adis16400_probe(struct spi_device *spi) if (!(st->variant->flags & ADIS16400_NO_BURST)) { adis16400_setup_chan_mask(st); indio_dev->available_scan_masks = st->avail_scan_mask; + st->adis.burst = &adis16400_burst; + if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) + st->adis.burst->extra_len = sizeof(u16); } ret = adis_init(&st->adis, indio_dev, spi, &adis16400_data); |