linux-kernel - Re: [PATCH v2 06/10] iio: gyro: itg3200: add mount matrix support

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Date:   Sun, 3 Mar 2019 15:22:15 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Song Qiang <songqiang1304521@...il.com>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
        Martin Kelly <mkelly@...o.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Brian Masney <masneyb@...tation.org>,
        Stephan Gerhold <stephan@...hold.net>,
        letux-kernel@...nphoenux.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/10] iio: gyro: itg3200: add mount matrix support

On Thu, 21 Feb 2019 18:02:51 +0100
"H. Nikolaus Schaller" <hns@...delico.com> wrote:

> This patch allows to read a mount-matrix device tree
> property and report to user-space or in-kernel iio
> clients.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
Applied.

Thanks,

Jonathan

> ---
>  drivers/iio/gyro/itg3200_core.c  | 20 ++++++++++++++++++++
>  include/linux/iio/gyro/itg3200.h |  1 +
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/iio/gyro/itg3200_core.c b/drivers/iio/gyro/itg3200_core.c
> index 7adecb562c81..203a6be33b70 100644
> --- a/drivers/iio/gyro/itg3200_core.c
> +++ b/drivers/iio/gyro/itg3200_core.c
> @@ -242,6 +242,20 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
>  	return ret;
>  }
>  
> +static const struct iio_mount_matrix *
> +itg3200_get_mount_matrix(const struct iio_dev *indio_dev,
> +			  const struct iio_chan_spec *chan)
> +{
> +	struct itg3200 *data = iio_priv(indio_dev);
> +
> +	return &data->orientation;
> +}
> +
> +static const struct iio_chan_spec_ext_info itg3200_ext_info[] = {
> +	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, itg3200_get_mount_matrix),
> +	{ }
> +};
> +
>  #define ITG3200_ST						\
>  	{ .sign = 's', .realbits = 16, .storagebits = 16, .endianness = IIO_BE }
>  
> @@ -255,6 +269,7 @@ static int itg3200_initial_setup(struct iio_dev *indio_dev)
>  	.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
>  	.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
>  	.scan_type = ITG3200_ST, \
> +	.ext_info = itg3200_ext_info, \
>  }
>  
>  static const struct iio_chan_spec itg3200_channels[] = {
> @@ -297,6 +312,11 @@ static int itg3200_probe(struct i2c_client *client,
>  
>  	st = iio_priv(indio_dev);
>  
> +	ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
> +				&st->orientation);
> +	if (ret)
> +		return ret;
> +
>  	i2c_set_clientdata(client, indio_dev);
>  	st->i2c = client;
>  
> diff --git a/include/linux/iio/gyro/itg3200.h b/include/linux/iio/gyro/itg3200.h
> index 2a820850f284..0a30fddccfb3 100644
> --- a/include/linux/iio/gyro/itg3200.h
> +++ b/include/linux/iio/gyro/itg3200.h
> @@ -104,6 +104,7 @@
>  struct itg3200 {
>  	struct i2c_client	*i2c;
>  	struct iio_trigger	*trig;
> +	struct iio_mount_matrix orientation;
>  };
>  
>  enum ITG3200_SCAN_INDEX {