iio: st_accel: support 8bit channel data
Some sensors like the LIS331DL only support 8bit data by a single
register per axis. These utilize the MSB byte. Make it possible
to register these apropriately.
A oneliner change is needed in the ST sensors core to handle 8bit
reads as this is the first supported 8bit sensor.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
index 58d1d13..ad19fb4 100644
--- a/drivers/iio/accel/st_accel_core.c
+++ b/drivers/iio/accel/st_accel_core.c
@@ -153,6 +153,22 @@
#define ST_ACCEL_4_IG1_EN_MASK 0x08
#define ST_ACCEL_4_MULTIREAD_BIT true
+static const struct iio_chan_spec st_accel_8bit_channels[] = {
+ ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 8, 8,
+ ST_ACCEL_DEFAULT_OUT_X_L_ADDR+1),
+ ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 8, 8,
+ ST_ACCEL_DEFAULT_OUT_Y_L_ADDR+1),
+ ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 8, 8,
+ ST_ACCEL_DEFAULT_OUT_Z_L_ADDR+1),
+ IIO_CHAN_SOFT_TIMESTAMP(3)
+};
+
static const struct iio_chan_spec st_accel_12bit_channels[] = {
ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
index 1255b15..bf4b13f 100644
--- a/drivers/iio/common/st_sensors/st_sensors_core.c
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -433,7 +433,9 @@
if (err < 0)
goto st_sensors_free_memory;
- if (byte_for_channel == 2)
+ if (byte_for_channel == 1)
+ *data = (s8)*outdata;
+ else if (byte_for_channel == 2)
*data = (s16)get_unaligned_le16(outdata);
else if (byte_for_channel == 3)
*data = (s32)st_sensors_get_unaligned_le24(outdata);