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From: Lorenzo Bianconi <lorenzo@kernel.org>
To: Sean Nyekjaer <sean@geanix.com>
Cc: linux-iio@vger.kernel.org, jic23@kernel.org,
	lorenzo.bianconi83@gmail.com, denis.ciocca@st.com,
	mario.tesi@st.com, armando.visconti@st.com, martin@geanix.com
Subject: Re: [RFC PATCH] iio: imu: st_lsm6dsx: filter motion events in driver
Date: Mon, 16 Sep 2019 13:55:38 +0200
Message-ID: <20190916115538.GC16063@localhost.localdomain> (raw)
In-Reply-To: <07c96bca-f952-71c0-4608-30746fbbc055@geanix.com>

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> 
> 
> On 16/09/2019 11.16, Lorenzo Bianconi wrote:
> > > +	if (hw->event_en_mask & BIT(chan->channel2))
> > > +		goto out;
> > Why do we need this?
> > 
> 
> Guess we need to check if 0 < hw->enable_event before disabling the
> sensor...
> > > +
> > >   	/* do not enable events if they are already enabled */
> > >   	if (state && hw->enable_event)
> > > -		return 0;
> > > +		goto out;
> 
> static int st_lsm6dsx_write_event_config(struct iio_dev *iio_dev,
>                                            const struct iio_chan_spec *chan,
>                                            enum iio_event_type type,
>                                            enum iio_event_direction dir,
>                                            int state)
> {
>         struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
>         struct st_lsm6dsx_hw *hw = sensor->hw;
>         u8 _enable_event;

please use enable_event instead of _enable_event

>         int err = 0;
> 
>         if (type != IIO_EV_TYPE_THRESH)
>                 return -EINVAL;
> 
>         if (state) {
>                 _enable_event = hw->enable_event | BIT(chan->channel2);
> 
>                 /* do not enable events if they are already enabled */
>                 if (0 < hw->enable_event)
>                         goto out;

we do not need this since there is the check:
if (hw->enable_event == enable_event)
	return 0;

>         } else {
>                 _enable_event = hw->enable_event & ~BIT(chan->channel2);
> 
>                 /* only turn off sensor if no events is enabled */
> 
> 
> 
> 
>                 if (0 != _enable_event)
>                         goto out;

we do not need this as well

>         }
> 
>         /* stop here if no changes have been made */
>         if (hw->enable_event == _enable_event)
>                 return 0;
> 
>         err = st_lsm6dsx_event_setup(hw, state);
>         if (err < 0)
>                 return err;
> 
>         err = st_lsm6dsx_sensor_set_enable(sensor, state);
>         if (err < 0)
>                 return err;
> 
> out:
>         hw->enable_event = _enable_event;
> 
>         return 0;
> }
> 
> Is something like this better?

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  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13  9:07 [PATCH v8 0/5] enable motion events for st_lsm6dsx Sean Nyekjaer
2019-09-13  9:07 ` [PATCH v8 1/5] iio: imu: st_lsm6dsx: move interrupt thread to core Sean Nyekjaer
2019-09-13  9:07 ` [PATCH v8 2/5] iio: imu: st_lsm6dsx: add motion events Sean Nyekjaer
2019-09-13  9:07 ` [PATCH v8 3/5] iio: imu: st_lsm6dsx: add wakeup-source option Sean Nyekjaer
2019-09-15 13:42   ` Lorenzo Bianconi
2019-09-13  9:07 ` [PATCH v8 4/5] iio: imu: st_lsm6dsx: always enter interrupt thread Sean Nyekjaer
2019-09-15 12:33   ` Jonathan Cameron
2019-09-15 12:48     ` Lorenzo Bianconi
2019-09-15 13:00       ` Jonathan Cameron
2019-09-15 13:07         ` Lorenzo Bianconi
2019-09-13  9:07 ` [PATCH v8 5/5] iio: imu: st_lsm6dsx: add motion report function and call from interrupt Sean Nyekjaer
2019-09-15 12:30   ` Jonathan Cameron
2019-09-15 13:05     ` Lorenzo Bianconi
2019-09-15 13:18       ` Jonathan Cameron
2019-09-15 13:22         ` Sean Nyekjaer
2019-09-15 13:35           ` Jonathan Cameron
2019-09-16  9:02             ` [RFC PATCH] iio: imu: st_lsm6dsx: filter motion events in driver Sean Nyekjaer
2019-09-16  9:16               ` Lorenzo Bianconi
2019-09-16 11:29                 ` Sean Nyekjaer
2019-09-16 11:55                   ` Lorenzo Bianconi [this message]
2019-09-16 12:09                     ` Sean Nyekjaer
2019-09-16 12:22                       ` Lorenzo Bianconi
2019-09-15 13:41         ` [PATCH v8 5/5] iio: imu: st_lsm6dsx: add motion report function and call from interrupt Lorenzo Bianconi

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