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Date:   Mon, 26 Aug 2019 09:10:52 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Martin Kepplinger <martin.kepplinger@puri.sm>
Cc:     lorenzo.bianconi83@gmail.com, knaack.h@gmx.de, lars@metafoo.de,
        pmeerw@pmeerw.net, robh+dt@kernel.org, mark.rutland@arm.com,
        linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, Lorenzo Bianconi <lorenzo@kernel.org>
Subject: Re: [PATCH v5 1/4] iio: imu: st_lsm6dsx: introduce update_fifo
 function pointer
Message-ID: <20190826091052.771e96c6@archlinux>
In-Reply-To: <20190821132520.28225-2-martin.kepplinger@puri.sm>
References: <20190821132520.28225-1-martin.kepplinger@puri.sm>
        <20190821132520.28225-2-martin.kepplinger@puri.sm>
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Sender: linux-kernel-owner@vger.kernel.org
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On Wed, 21 Aug 2019 15:25:17 +0200
Martin Kepplinger <martin.kepplinger@puri.sm> wrote:

> From: Lorenzo Bianconi <lorenzo@kernel.org>
> 
> Introduce update_fifo routine pointer in st_lsm6dsx_fifo_ops data
> structure since we will need a different update FIFO configuration
> callback adding support for lsm6ds0/lsm9ds1 imu device
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> Tested-by: Martin Kepplinger <martin.kepplinger@puri.sm>

Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h       |  4 ++++
>  .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c    | 19 +++++++++++++++----
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c  |  6 ++++++
>  3 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> index 4e8e67ae1632..055e52dec36a 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> @@ -75,6 +75,7 @@ struct st_lsm6dsx_reg {
>  	u8 mask;
>  };
>  
> +struct st_lsm6dsx_sensor;
>  struct st_lsm6dsx_hw;
>  
>  struct st_lsm6dsx_odr {
> @@ -101,12 +102,14 @@ struct st_lsm6dsx_fs_table_entry {
>  
>  /**
>   * struct st_lsm6dsx_fifo_ops - ST IMU FIFO settings
> + * @update_fifo: Update FIFO configuration callback.
>   * @read_fifo: Read FIFO callback.
>   * @fifo_th: FIFO threshold register info (addr + mask).
>   * @fifo_diff: FIFO diff status register info (addr + mask).
>   * @th_wl: FIFO threshold word length.
>   */
>  struct st_lsm6dsx_fifo_ops {
> +	int (*update_fifo)(struct st_lsm6dsx_sensor *sensor, bool enable);
>  	int (*read_fifo)(struct st_lsm6dsx_hw *hw);
>  	struct {
>  		u8 addr;
> @@ -327,6 +330,7 @@ int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw);
>  int st_lsm6dsx_set_watermark(struct iio_dev *iio_dev, unsigned int val);
>  int st_lsm6dsx_update_watermark(struct st_lsm6dsx_sensor *sensor,
>  				u16 watermark);
> +int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable);
>  int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw);
>  int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
>  			     enum st_lsm6dsx_fifo_mode fifo_mode);
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> index 2c03a5b80f80..b0f3da1976e4 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> @@ -602,9 +602,8 @@ int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw)
>  	return err;
>  }
>  
> -static int st_lsm6dsx_update_fifo(struct iio_dev *iio_dev, bool enable)
> +int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
>  {
> -	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
>  	struct st_lsm6dsx_hw *hw = sensor->hw;
>  	int err;
>  
> @@ -676,12 +675,24 @@ static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
>  
>  static int st_lsm6dsx_buffer_preenable(struct iio_dev *iio_dev)
>  {
> -	return st_lsm6dsx_update_fifo(iio_dev, true);
> +	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> +	struct st_lsm6dsx_hw *hw = sensor->hw;
> +
> +	if (!hw->settings->fifo_ops.update_fifo)
> +		return -ENOTSUPP;
> +
> +	return hw->settings->fifo_ops.update_fifo(sensor, true);
>  }
>  
>  static int st_lsm6dsx_buffer_postdisable(struct iio_dev *iio_dev)
>  {
> -	return st_lsm6dsx_update_fifo(iio_dev, false);
> +	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> +	struct st_lsm6dsx_hw *hw = sensor->hw;
> +
> +	if (!hw->settings->fifo_ops.update_fifo)
> +		return -ENOTSUPP;
> +
> +	return hw->settings->fifo_ops.update_fifo(sensor, false);
>  }
>  
>  static const struct iio_buffer_setup_ops st_lsm6dsx_buffer_ops = {
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 85824d6739ee..0aa93b45d772 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -154,6 +154,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_fifo,
>  			.fifo_th = {
>  				.addr = 0x06,
> @@ -262,6 +263,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_fifo,
>  			.fifo_th = {
>  				.addr = 0x06,
> @@ -379,6 +381,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_fifo,
>  			.fifo_th = {
>  				.addr = 0x06,
> @@ -490,6 +493,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_tagged_fifo,
>  			.fifo_th = {
>  				.addr = 0x07,
> @@ -616,6 +620,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_tagged_fifo,
>  			.fifo_th = {
>  				.addr = 0x07,
> @@ -719,6 +724,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
>  			},
>  		},
>  		.fifo_ops = {
> +			.update_fifo = st_lsm6dsx_update_fifo,
>  			.read_fifo = st_lsm6dsx_read_tagged_fifo,
>  			.fifo_th = {
>  				.addr = 0x07,