Re: [PATCH v3 1/6] iio: imu: st_lsm6dsx: move interrupt thread to core

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> This prepares the interrupt to be used for other stuff than
> fifo reading + event readings.
> 
> Signed-off-by: Sean Nyekjaer <sean@geanix.com>
> ---
> Changes since v1:
>  * none
> Changes since v2:
>  * none
> 
>  .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c    | 78 +---------------
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c  | 88 +++++++++++++++++++
>  2 files changed, 89 insertions(+), 77 deletions(-)

Hi Sean,

just a couple of nitpick inline (they can be addressed even in a follow up
patch)

Regards,
Lorenzo

> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> index b0f3da1976e4..ef579650fd52 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> @@ -30,8 +30,6 @@
>   * Denis Ciocca <denis.ciocca@st.com>
>   */
>  #include <linux/module.h>
> -#include <linux/interrupt.h>
> -#include <linux/irq.h>
>  #include <linux/iio/kfifo_buf.h>
>  #include <linux/iio/iio.h>
>  #include <linux/iio/buffer.h>
> @@ -42,10 +40,6 @@
>  
>  #include "st_lsm6dsx.h"

[...]

> +static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
> +{
> +	struct st_lsm6dsx_hw *hw = private;
> +
> +	return hw->sip > 0 ? IRQ_WAKE_THREAD : IRQ_NONE;
> +}
> +
> +static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
> +{
> +	struct st_lsm6dsx_hw *hw = private;
> +	int count;
> +
> +	mutex_lock(&hw->fifo_lock);
> +	count = hw->settings->fifo_ops.read_fifo(hw);
> +	mutex_unlock(&hw->fifo_lock);
> +
> +	return count ? IRQ_HANDLED : IRQ_NONE;
> +}
> +
> +int st_lsm6dsx_irq_setup(struct st_lsm6dsx_hw *hw)

it can be static

> +{
> +	struct st_sensors_platform_data *pdata;
> +	struct device_node *np = hw->dev->of_node;
> +	unsigned long irq_type;
> +	bool irq_active_low;
> +	int err;
> +
> +	irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
> +
> +	switch (irq_type) {
> +	case IRQF_TRIGGER_HIGH:
> +	case IRQF_TRIGGER_RISING:
> +		irq_active_low = false;
> +		break;
> +	case IRQF_TRIGGER_LOW:
> +	case IRQF_TRIGGER_FALLING:
> +		irq_active_low = true;
> +		break;
> +	default:
> +		dev_info(hw->dev, "mode %lx unsupported\n", irq_type);
> +		return -EINVAL;
> +	}
> +
> +	err = regmap_update_bits(hw->regmap, ST_LSM6DSX_REG_HLACTIVE_ADDR,
> +				 ST_LSM6DSX_REG_HLACTIVE_MASK,
> +				 FIELD_PREP(ST_LSM6DSX_REG_HLACTIVE_MASK,
> +					    irq_active_low));
> +	if (err < 0)
> +		return err;
> +
> +	pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
> +	if ((np && of_property_read_bool(np, "drive-open-drain")) ||
> +	    (pdata && pdata->open_drain)) {
> +		err = regmap_update_bits(hw->regmap, ST_LSM6DSX_REG_PP_OD_ADDR,
> +					 ST_LSM6DSX_REG_PP_OD_MASK,
> +					 FIELD_PREP(ST_LSM6DSX_REG_PP_OD_MASK,
> +						    1));
> +		if (err < 0)
> +			return err;
> +
> +		irq_type |= IRQF_SHARED;
> +	}
> +
> +	err = devm_request_threaded_irq(hw->dev, hw->irq,
> +					st_lsm6dsx_handler_irq,
> +					st_lsm6dsx_handler_thread,
> +					irq_type | IRQF_ONESHOT,
> +					"lsm6dsx", hw);
> +	if (err) {
> +		dev_err(hw->dev, "failed to request trigger irq %d\n",
> +			hw->irq);
> +		return err;
> +	}
> +
> +	return err;

return 0 here or remove the previous one

> +}
> +
>  int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
>  		     struct regmap *regmap)
>  {
> @@ -1514,6 +1598,10 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
>  	}
>  
>  	if (hw->irq > 0) {
> +		err = st_lsm6dsx_irq_setup(hw);
> +		if (err < 0)
> +			return err;
> +
>  		err = st_lsm6dsx_fifo_setup(hw);
>  		if (err < 0)
>  			return err;
> -- 
> 2.23.0
> 

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