iio: accel: kxcjk1013: Support orientation matrix

Hardware could be physically mounted in any possible direction and
userpspace needs to be aware of the mounting orientation in order to
process sensor's data correctly. In particular this helps iio-sensor-proxy
to report display's orientation properly on a phone/tablet devices.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index fee535d6e45b0c17f853b5300dfbb666a7028581..c9924a65c32a0ea8c9ec67bea06a208ba56429ea 100644 (file)
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -130,6 +130,7 @@ struct kxcjk1013_data {
        struct i2c_client *client;
        struct iio_trigger *dready_trig;
        struct iio_trigger *motion_trig;
+       struct iio_mount_matrix orientation;
        struct mutex mutex;
        s16 buffer[8];
        u8 odr_bits;
@@ -983,6 +984,20 @@ static const struct iio_event_spec kxcjk1013_event = {
                                 BIT(IIO_EV_INFO_PERIOD)
 };
 
+static const struct iio_mount_matrix *
+kxcjk1013_get_mount_matrix(const struct iio_dev *indio_dev,
+                          const struct iio_chan_spec *chan)
+{
+       struct kxcjk1013_data *data = iio_priv(indio_dev);
+
+       return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info kxcjk1013_ext_info[] = {
+       IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, kxcjk1013_get_mount_matrix),
+       { }
+};
+
 #define KXCJK1013_CHANNEL(_axis) {                                     \
        .type = IIO_ACCEL,                                              \
        .modified = 1,                                                  \
@@ -999,6 +1014,7 @@ static const struct iio_event_spec kxcjk1013_event = {
                .endianness = IIO_LE,                                   \
        },                                                              \
        .event_spec = &kxcjk1013_event,                         \
+       .ext_info = kxcjk1013_ext_info,                                 \
        .num_event_specs = 1                                            \
 }
 
@@ -1267,11 +1283,18 @@ static int kxcjk1013_probe(struct i2c_client *client,
        data->client = client;
 
        pdata = dev_get_platdata(&client->dev);
-       if (pdata)
+       if (pdata) {
                data->active_high_intr = pdata->active_high_intr;
-       else
+               data->orientation = pdata->orientation;
+       } else {
                data->active_high_intr = true; /* default polarity */
 
+               ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
+                                           &data->orientation);
+               if (ret)
+                       return ret;
+       }
+
        if (id) {
                data->chipset = (enum kx_chipset)(id->driver_data);
                name = id->name;

diff --git a/include/linux/iio/accel/kxcjk_1013.h b/include/linux/iio/accel/kxcjk_1013.h
index 8c3c78bc9f91eb3cd76202d85518ff5fb4c6a54d..ea0ecb774371bd63df0bc52dc089b542f1f7f535 100644 (file)
--- a/include/linux/iio/accel/kxcjk_1013.h
+++ b/include/linux/iio/accel/kxcjk_1013.h
@@ -7,8 +7,11 @@
 #ifndef __IIO_KXCJK_1013_H__
 #define __IIO_KXCJK_1013_H__
 
+#include <linux/iio/iio.h>
+
 struct kxcjk_1013_platform_data {
        bool active_high_intr;
+       struct iio_mount_matrix orientation;
 };
 
 #endif