On Thu, 19 Feb 2015, Martin Fuzzey wrote:
> Add a new attribute to activate the self test mode.
>
> When self test is activated, an electrostatic actuation force is
> applied to the sensor, simulating a small acceleration.
comment below
> Signed-off-by: Martin Fuzzey <mfuzzey@xxxxxxxxxxx>
> ---
> .../ABI/testing/sysfs-bus-iio-accel-mma8452 | 10 ++++
> drivers/iio/accel/mma8452.c | 52 ++++++++++++++++++++
> 2 files changed, 62 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-accel-mma8452
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-accel-mma8452 b/Documentation/ABI/testing/sysfs-bus-iio-accel-mma8452
> new file mode 100644
> index 0000000..387ed38
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-accel-mma8452
> @@ -0,0 +1,10 @@
> +What: /sys/bus/iio/devices/iio:deviceX/self_test
> +KernelVersion: 3.21
bad timing :)
> +Contact: linux-iio@xxxxxxxxxxxxxxx
> +Description:
> + Allow self test mode to be controlled:
> + "0" = inactive
> + "1" = active
> + When self test is activated, an electrostatic actuation force is
> + applied to the sensor, simulating a small acceleration.
> +
> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> index 6277b5d..75dcc6e 100644
> --- a/drivers/iio/accel/mma8452.c
> +++ b/drivers/iio/accel/mma8452.c
> @@ -49,6 +49,7 @@
> #define MMA8452_CTRL_REG1 0x2a
> #define MMA8452_CTRL_REG2 0x2b
> #define MMA8452_CTRL_REG2_RST BIT(6)
> +#define MMA8452_CTRL_REG2_SELFTEST BIT(7)
> #define MMA8452_CTRL_REG4 0x2d
> #define MMA8452_CTRL_REG5 0x2e
>
> @@ -639,6 +640,56 @@ static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
> return ret;
> }
>
> +static ssize_t mma8452_show_selftest(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct mma8452_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG2);
> + if (ret < 0)
> + return ret;
> +
> + return sprintf(buf, "%d\n", ret & MMA8452_CTRL_REG2_SELFTEST ? 1 : 0);
> +}
> +
> +static ssize_t mma8452_store_selftest(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct mma8452_data *data = iio_priv(indio_dev);
> + bool state;
> + int ret;
> + u8 val;
> +
> + ret = strtobool(buf, &state);
> + if (ret < 0)
> + return ret;
> +
take mutex?
> + ret = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG2);
> + if (ret < 0)
> + return ret;
> +
> + val = ret;
> + if (state)
> + val |= MMA8452_CTRL_REG2_SELFTEST;
> + else
> + val &= ~MMA8452_CTRL_REG2_SELFTEST;
> +
> + ret = mma8452_change_config(data, MMA8452_CTRL_REG2, val);
> + if (ret)
> + return ret;
> +
> + return len;
> +}
> +
> +static IIO_DEVICE_ATTR(self_test,
> + S_IRUGO | S_IWUSR,
> + mma8452_show_selftest,
> + mma8452_store_selftest, 0);
> +
> static const struct iio_event_spec mma8452_transient_event[] = {
> {
> .type = IIO_EV_TYPE_THRESH,
> @@ -698,6 +749,7 @@ static struct attribute *mma8452_attributes[] = {
> &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
> &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
> &iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr,
> + &iio_dev_attr_self_test.dev_attr.attr,
> NULL
> };
>
>
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--
Peter Meerwald
+43-664-2444418 (mobile)
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