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iio: adis16400: Fix burst transfer for adis16448 

The adis16448, unlike the other chips in this family, in addition to the
hardware channels also sends out the DIAG_STAT register in burst mode
before them. Handle that case by skipping over the first 2 bytes before we
pass the received data to the buffer.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Fixes: 76ada52f7f ("iio:adis16400: Add support for the adis16448")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-05-15 17:18:38 +02:00 committed by Jonathan Cameron
parent 9df560350c
commit d046ba268a
3 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/iio/imu/adis16400.h
View File

@ -139,6 +139,7 @@
#define ADIS16400_NO_BURST BIT(1)
#define ADIS16400_HAS_SLOW_MODE BIT(2)
#define ADIS16400_HAS_SERIAL_NUMBER BIT(3)
#define ADIS16400_BURST_DIAG_STAT BIT(4)
struct adis16400_state;

10
drivers/iio/imu/adis16400_buffer.c
View File

@ -29,6 +29,8 @@ 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);
adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
if (!adis->xfer)
@ -63,6 +65,7 @@ irqreturn_t adis16400_trigger_handler(int irq, void *p)
struct adis16400_state *st = iio_priv(indio_dev);
struct adis *adis = &st->adis;
u32 old_speed_hz = st->adis.spi->max_speed_hz;
void *buffer;
int ret;
if (!adis->buffer)
@ -83,7 +86,12 @@ irqreturn_t adis16400_trigger_handler(int irq, void *p)
spi_setup(st->adis.spi);
}
iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
buffer = adis->buffer + sizeof(u16);
else
buffer = adis->buffer;
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
pf->timestamp);
iio_trigger_notify_done(indio_dev->trig);

3
drivers/iio/imu/adis16400_core.c
View File

@ -778,7 +778,8 @@ static struct adis16400_chip_info adis16400_chips[] = {
.channels = adis16448_channels,
.num_channels = ARRAY_SIZE(adis16448_channels),
.flags = ADIS16400_HAS_PROD_ID |
ADIS16400_HAS_SERIAL_NUMBER,
ADIS16400_HAS_SERIAL_NUMBER |
ADIS16400_BURST_DIAG_STAT,
.gyro_scale_micro = IIO_DEGREE_TO_RAD(10000), /* 0.01 deg/s */
.accel_scale_micro = IIO_G_TO_M_S_2(833), /* 1/1200 g */
.temp_scale_nano = 73860000, /* 0.07386 C */