Re: [PATCH v8 5/5] iio: imu: st_lsm6dsx: add motion report function and call from interrupt

[Jonathan Cameron <jic23@kernel.org>]

On Sun, 15 Sep 2019 15:22:44 +0200
Sean Nyekjaer <sean@geanix.com> wrote:

> On 15/09/2019 15.18, Jonathan Cameron wrote:
> > On Sun, 15 Sep 2019 15:05:08 +0200
> > Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> >   
> >>> On Fri, 13 Sep 2019 11:07:08 +0200
> >>> Sean Nyekjaer <sean@geanix.com> wrote:
> >>>      
> >>>> Report iio motion events to iio subsystem
> >>>>
> >>>> Signed-off-by: Sean Nyekjaer <sean@geanix.com>  
> >>> I got to the earlier thread rather late so hadn't replied to your
> >>> question on filtering events that haven't been enabled.  
> >>
> >> IIUC, how is possible to filter events? it seems not currently supported in
> >> hw, right?  
> > Filter them in software on their way to userspace.  So you'll get an interrupt
> > either way, but no need to tell userspace about event's it's not interested
> > in.  
> 
> Fine by me, will submit a V9.
> 
> Which one is preferred:
> in_accel_thresh_(x,y,z)_en -> in_accel_thresh_both_en
> or keep in_accel_thresh_(x,y,z)_en and filter them in the driver?
> 
> We would wake on all events either way

I think I slightly prefer filtering in the driver.  Wakeup will
just have to be a bit strange if someone actually doesn't want to wake
based on all axis.

Thanks,

Jonathan

> 
> /Sean
> 
> >>  
> >>>
> >>> Hence I think it's just that change outstanding
> >>> + I want to give Lorenzo time for a final look.  
> >>
> >> Jonathan the series seems fine to me now, there are some leftover nitpicks we can
> >> cover with some follow-up patches.  
> > 
> > Acks/Reviewed-bys?  Let's do this formally!
> > 
> > Jonathan
> >   
> >>
> >> Regards,
> >> Lorenzo
> >>  
> >>>
> >>> Thanks,
> >>>
> >>> Jonathan
> >>>      
> >>>> ---
> >>>> Changes since v4:
> >>>>   * Updated bitmask as pr Jonathans comments
> >>>>
> >>>> Changes since v5:
> >>>>   * None
> >>>>
> >>>> Changes since v6:
> >>>>   * None
> >>>>
> >>>> Changes since v7:
> >>>>   * None
> >>>>
> >>>>   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h      |  5 ++
> >>>>   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 70 ++++++++++++++++++++
> >>>>   2 files changed, 75 insertions(+)
> >>>>
> >>>> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> >>>> index 449c2798f7ed..7c50fac7b85c 100644
> >>>> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> >>>> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> >>>> @@ -186,6 +186,11 @@ struct st_lsm6dsx_shub_settings {
> >>>>   struct st_lsm6dsx_event_settings {
> >>>>   	struct st_lsm6dsx_reg enable_reg;
> >>>>   	struct st_lsm6dsx_reg wakeup_reg;
> >>>> +	u8 wakeup_src_reg;
> >>>> +	u8 wakeup_src_status_mask;
> >>>> +	u8 wakeup_src_z_mask;
> >>>> +	u8 wakeup_src_y_mask;
> >>>> +	u8 wakeup_src_x_mask;
> >>>>   };
> >>>>   
> >>>>   enum st_lsm6dsx_ext_sensor_id {
> >>>> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> >>>> index 80a94335175f..66700c20920d 100644
> >>>> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> >>>> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> >>>> @@ -48,6 +48,7 @@
> >>>>   #include <linux/kernel.h>
> >>>>   #include <linux/module.h>
> >>>>   #include <linux/delay.h>
> >>>> +#include <linux/iio/events.h>
> >>>>   #include <linux/iio/iio.h>
> >>>>   #include <linux/iio/sysfs.h>
> >>>>   #include <linux/interrupt.h>
> >>>> @@ -287,6 +288,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >>>>   				.addr = 0x5B,
> >>>>   				.mask = GENMASK(5, 0),
> >>>>   			},
> >>>> +			.wakeup_src_reg = 0x1b,
> >>>> +			.wakeup_src_status_mask = BIT(3),
> >>>> +			.wakeup_src_z_mask = BIT(0),
> >>>> +			.wakeup_src_y_mask = BIT(1),
> >>>> +			.wakeup_src_x_mask = BIT(2),
> >>>>   		},
> >>>>   	},
> >>>>   	{
> >>>> @@ -412,6 +418,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >>>>   				.addr = 0x5B,
> >>>>   				.mask = GENMASK(5, 0),
> >>>>   			},
> >>>> +			.wakeup_src_reg = 0x1b,
> >>>> +			.wakeup_src_status_mask = BIT(3),
> >>>> +			.wakeup_src_z_mask = BIT(0),
> >>>> +			.wakeup_src_y_mask = BIT(1),
> >>>> +			.wakeup_src_x_mask = BIT(2),
> >>>>   		},
> >>>>   	},
> >>>>   	{
> >>>> @@ -550,6 +561,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >>>>   				.addr = 0x5B,
> >>>>   				.mask = GENMASK(5, 0),
> >>>>   			},
> >>>> +			.wakeup_src_reg = 0x1b,
> >>>> +			.wakeup_src_status_mask = BIT(3),
> >>>> +			.wakeup_src_z_mask = BIT(0),
> >>>> +			.wakeup_src_y_mask = BIT(1),
> >>>> +			.wakeup_src_x_mask = BIT(2),
> >>>>   		},
> >>>>   	},
> >>>>   	{
> >>>> @@ -816,6 +832,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >>>>   				.addr = 0x5B,
> >>>>   				.mask = GENMASK(5, 0),
> >>>>   			},
> >>>> +			.wakeup_src_reg = 0x1b,
> >>>> +			.wakeup_src_status_mask = BIT(3),
> >>>> +			.wakeup_src_z_mask = BIT(0),
> >>>> +			.wakeup_src_y_mask = BIT(1),
> >>>> +			.wakeup_src_x_mask = BIT(2),
> >>>>   		},
> >>>>   	},
> >>>>   	{
> >>>> @@ -970,6 +991,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
> >>>>   				.addr = 0x5B,
> >>>>   				.mask = GENMASK(5, 0),
> >>>>   			},
> >>>> +			.wakeup_src_reg = 0x1b,
> >>>> +			.wakeup_src_status_mask = BIT(3),
> >>>> +			.wakeup_src_z_mask = BIT(0),
> >>>> +			.wakeup_src_y_mask = BIT(1),
> >>>> +			.wakeup_src_x_mask = BIT(2),
> >>>>   		}
> >>>>   	},
> >>>>   };
> >>>> @@ -1715,6 +1741,38 @@ static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,
> >>>>   	return iio_dev;
> >>>>   }
> >>>>   
> >>>> +void st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw, int data)
> >>>> +{
> >>>> +	s64 timestamp = iio_get_time_ns(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
> >>>> +
> >>>> +	if (data & hw->settings->event_settings.wakeup_src_z_mask)
> >>>> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> >>>> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> >>>> +						  0,
> >>>> +						  IIO_MOD_Z,
> >>>> +						  IIO_EV_TYPE_THRESH,
> >>>> +						  IIO_EV_DIR_EITHER),
> >>>> +						  timestamp);
> >>>> +
> >>>> +	if (data & hw->settings->event_settings.wakeup_src_x_mask)
> >>>> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> >>>> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> >>>> +						  0,
> >>>> +						  IIO_MOD_Y,
> >>>> +						  IIO_EV_TYPE_THRESH,
> >>>> +						  IIO_EV_DIR_EITHER),
> >>>> +						  timestamp);
> >>>> +
> >>>> +	if (data & hw->settings->event_settings.wakeup_src_x_mask)
> >>>> +		iio_push_event(hw->iio_devs[ST_LSM6DSX_ID_ACC],
> >>>> +			       IIO_MOD_EVENT_CODE(IIO_ACCEL,
> >>>> +						  0,
> >>>> +						  IIO_MOD_X,
> >>>> +						  IIO_EV_TYPE_THRESH,
> >>>> +						  IIO_EV_DIR_EITHER),
> >>>> +						  timestamp);
> >>>> +}
> >>>> +
> >>>>   static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
> >>>>   {
> >>>>   	return IRQ_WAKE_THREAD;
> >>>> @@ -1724,6 +1782,18 @@ static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
> >>>>   {
> >>>>   	struct st_lsm6dsx_hw *hw = private;
> >>>>   	int count;
> >>>> +	int data, err;
> >>>> +
> >>>> +	if (hw->enable_event) {
> >>>> +		err = regmap_read(hw->regmap,
> >>>> +				  hw->settings->event_settings.wakeup_src_reg,
> >>>> +				  &data);
> >>>> +		if (err < 0)
> >>>> +			return IRQ_NONE;
> >>>> +
> >>>> +		if (data & hw->settings->event_settings.wakeup_src_status_mask)
> >>>> +			st_lsm6dsx_report_motion_event(hw, data);
> >>>> +	}
> >>>>   
> >>>>   	mutex_lock(&hw->fifo_lock);
> >>>>   	count = hw->settings->fifo_ops.read_fifo(hw);  
> >>>      
> >