4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
commit d046ba268adb87c7780494ecf897cbafbf100d57 upstream.
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@xxxxxxxxxx>
Fixes: 76ada52f7f5d ("iio:adis16400: Add support for the adis16448")
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/imu/adis16400.h | 1 +
drivers/iio/imu/adis16400_buffer.c | 10 +++++++++-
drivers/iio/imu/adis16400_core.c | 3 ++-
3 files changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/iio/imu/adis16400.h
+++ b/drivers/iio/imu/adis16400.h
@@ -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;
--- a/drivers/iio/imu/adis16400_buffer.c
+++ b/drivers/iio/imu/adis16400_buffer.c
@@ -29,6 +29,8 @@ int adis16400_update_scan_mode(struct ii
/* 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(in
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(in
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);
--- a/drivers/iio/imu/adis16400_core.c
+++ b/drivers/iio/imu/adis16400_core.c
@@ -778,7 +778,8 @@ static struct adis16400_chip_info adis16
.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 */
--
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