From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Fix a set of closely related issues.
1. When using fifo_values() there was not enough space for the timestamp to
be inserted by iio_push_to_buffers_with_timestamp()
2. fifo_values() did not meet the alignment requirement of
iio_push_to_buffers_with_timestamp()
3. hw_values did not meet the alignment requirement either.
1 and 2 fixed by using new iio_push_to_buffers_with_ts_unaligned() which has
no alignment or space padding requirements.
3 fixed by introducing a structure that makes the space and alignment
requirements explicit.
Fixes: 3904b28efb2c ("iio: gyro: Add driver for the MPU-3050 gyroscope")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/iio/gyro/mpu3050-core.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
index 3225de1f023b..ea387efab62d 100644
--- a/drivers/iio/gyro/mpu3050-core.c
+++ b/drivers/iio/gyro/mpu3050-core.c
@@ -471,13 +471,10 @@ static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
struct iio_dev *indio_dev = pf->indio_dev;
struct mpu3050 *mpu3050 = iio_priv(indio_dev);
int ret;
- /*
- * Temperature 1*16 bits
- * Three axes 3*16 bits
- * Timestamp 64 bits (4*16 bits)
- * Sum total 8*16 bits
- */
- __be16 hw_values[8];
+ struct {
+ __be16 chans[4];
+ s64 timestamp __aligned(8);
+ } scan;
s64 timestamp;
unsigned int datums_from_fifo = 0;
@@ -572,9 +569,10 @@ static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
fifo_values[4]);
/* Index past the footer (fifo_values[0]) and push */
- iio_push_to_buffers_with_timestamp(indio_dev,
- &fifo_values[1],
- timestamp);
+ iio_push_to_buffers_with_ts_unaligned(indio_dev,
+ &fifo_values[1],
+ sizeof(__be16) * 4,
+ timestamp);
fifocnt -= toread;
datums_from_fifo++;
@@ -632,15 +630,15 @@ static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
goto out_trigger_unlock;
}
- ret = regmap_bulk_read(mpu3050->map, MPU3050_TEMP_H, &hw_values,
- sizeof(hw_values));
+ ret = regmap_bulk_read(mpu3050->map, MPU3050_TEMP_H, scan.chans,
+ sizeof(scan.chans));
if (ret) {
dev_err(mpu3050->dev,
"error reading axis data\n");
goto out_trigger_unlock;
}
- iio_push_to_buffers_with_timestamp(indio_dev, hw_values, timestamp);
+ iio_push_to_buffers_with_timestamp(indio_dev, &scan, timestamp);
out_trigger_unlock:
mutex_unlock(&mpu3050->lock);
--
2.32.0
