From: Lorenzo Bianconi Date: Sat, 17 Nov 2018 18:04:27 +0000 (+0100) Subject: iio: imu: st_lsm6dsx: do not use a fixed read len in read_oneshot X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=3aed83caa2f7370a04cc0be0e86d0939eba0c5f7;p=openwrt%2Fstaging%2Fblogic.git iio: imu: st_lsm6dsx: do not use a fixed read len in read_oneshot Generalize st_lsm6dsx_shub_read_oneshot in order to not use a fixed read length and take into account iio channel realbits for single read operations Signed-off-by: Lorenzo Bianconi Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c index ee59b0cac84f..8e47dccdd40f 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c @@ -432,8 +432,8 @@ st_lsm6dsx_shub_read_oneshot(struct st_lsm6dsx_sensor *sensor, struct iio_chan_spec const *ch, int *val) { - int err, delay, len = ch->scan_type.realbits >> 3; - __le16 data; + int err, delay, len; + u8 data[4]; err = st_lsm6dsx_shub_set_enable(sensor, true); if (err < 0) @@ -442,15 +442,17 @@ st_lsm6dsx_shub_read_oneshot(struct st_lsm6dsx_sensor *sensor, delay = 1000000 / sensor->odr; usleep_range(delay, 2 * delay); - err = st_lsm6dsx_shub_read(sensor, ch->address, (u8 *)&data, len); - if (err < 0) - return err; + len = min_t(int, sizeof(data), ch->scan_type.realbits >> 3); + err = st_lsm6dsx_shub_read(sensor, ch->address, data, len); st_lsm6dsx_shub_set_enable(sensor, false); + if (err < 0) + return err; + switch (len) { case 2: - *val = (s16)le16_to_cpu(data); + *val = (s16)le16_to_cpu(*((__le16 *)data)); break; default: return -EINVAL;