linux-kernel - Re: [PATCH] iio: accel: mma8452: claim direct mode during write raw

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Date:   Sat, 15 Oct 2016 10:00:09 -0700
From:   Alison Schofield <amsfield22@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: accel: mma8452: claim direct mode during write raw

On Sat, Oct 15, 2016 at 04:05:24PM +0100, Jonathan Cameron wrote:
> On 15/10/16 15:55, Jonathan Cameron wrote:
> > On 11/10/16 20:32, Alison Schofield wrote:
> >> Driver was checking for direct mode but not locking it.  Use
> >> claim/release helper functions to guarantee the device stays
> >> in direct mode during all write raw operations.
> >>
> >> Signed-off-by: Alison Schofield <amsfield22@...il.com>
> > Well you were consistent.  Forgot breaks that needed adding everywhere ;)
> > 
> > I fixed up and applied to the togreg branch of iio.git - initially
> > pushed out as testing for the autobuilders to play with it.
> > 
> > Please sanity check I didn't mess it up!
> Just noticed, that break would work better than goto here as well
> so have made that change and pushed out.
> 
> Let me know if i messed it up.

Thanks Jonathan.  I've looked at the ones you've repaired this 
morning and see the errors in my usage of return/goto/break in
the case statements.  Also sanity checked your fix-ups in
iio.git and they look right, of course :)

I'll fix up the ltr501 drivers and resend.
alisons 

> 
> Jonathan
> > 
> > Thanks,
> > 
> > Jonathan
> >> ---
> >>  drivers/iio/accel/mma8452.c | 53 +++++++++++++++++++++++++++------------------
> >>  1 file changed, 32 insertions(+), 21 deletions(-)
> >>
> >> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
> >> index 7951def..cbbc746 100644
> >> --- a/drivers/iio/accel/mma8452.c
> >> +++ b/drivers/iio/accel/mma8452.c
> >> @@ -666,37 +666,43 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
> >>  	struct mma8452_data *data = iio_priv(indio_dev);
> >>  	int i, ret;
> >>  
> >> -	if (iio_buffer_enabled(indio_dev))
> >> -		return -EBUSY;
> >> +	ret = iio_device_claim_direct_mode(indio_dev);
> >> +	if (ret)
> >> +		return ret;
> >>  
> >>  	switch (mask) {
> >>  	case IIO_CHAN_INFO_SAMP_FREQ:
> >>  		i = mma8452_get_samp_freq_index(data, val, val2);
> >> -		if (i < 0)
> >> -			return i;
> >> -
> >> +		if (i < 0) {
> >> +			ret = i;
> >> +			goto release;
> >> +		}
> >>  		data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
> >>  		data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
> >>  
> >> -		return mma8452_change_config(data, MMA8452_CTRL_REG1,
> >> -					     data->ctrl_reg1);
> >> +		ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
> >> +					    data->ctrl_reg1);
> > break?
> >>  	case IIO_CHAN_INFO_SCALE:
> >>  		i = mma8452_get_scale_index(data, val, val2);
> >> -		if (i < 0)
> >> -			return i;
> >> +		if (i < 0) {
> >> +			ret = i;
> >> +			goto release;
> >> +		}
> >>  
> >>  		data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
> >>  		data->data_cfg |= i;
> >>  
> >> -		return mma8452_change_config(data, MMA8452_DATA_CFG,
> >> -					     data->data_cfg);
> >> +		ret = mma8452_change_config(data, MMA8452_DATA_CFG,
> >> +					    data->data_cfg);
> > break?
> >>  	case IIO_CHAN_INFO_CALIBBIAS:
> >> -		if (val < -128 || val > 127)
> >> -			return -EINVAL;
> >> +		if (val < -128 || val > 127) {
> >> +			ret = -EINVAL;
> >> +			goto release;
> >> +		}
> >>  
> >> -		return mma8452_change_config(data,
> >> -					     MMA8452_OFF_X + chan->scan_index,
> >> -					     val);
> >> +		ret = mma8452_change_config(data,
> >> +					    MMA8452_OFF_X + chan->scan_index,
> >> +					    val);
> > break?
> >>  
> >>  	case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> >>  		if (val == 0 && val2 == 0) {
> >> @@ -705,23 +711,28 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
> >>  			data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
> >>  			ret = mma8452_set_hp_filter_frequency(data, val, val2);
> >>  			if (ret < 0)
> >> -				return ret;
> >> +				goto release;
> >>  		}
> >>  
> >> -		return mma8452_change_config(data, MMA8452_DATA_CFG,
> >> +		ret = mma8452_change_config(data, MMA8452_DATA_CFG,
> >>  					     data->data_cfg);
> >>  
> > break?
> >>  	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> >>  		ret = mma8452_get_odr_index(data);
> >>  
> >>  		for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) {
> >> -			if (mma8452_os_ratio[i][ret] == val)
> >> -				return mma8452_set_power_mode(data, i);
> >> +			if (mma8452_os_ratio[i][ret] == val) {
> >> +				ret = mma8452_set_power_mode(data, i);
> >> +				goto release;
> >> +			}
> >>  		}
> >>  
> >>  	default:
> >> -		return -EINVAL;
> >> +		ret = -EINVAL;
> >>  	}
> >> +release:
> >> +	iio_device_release_direct_mode(indio_dev);
> >> +	return ret;
> >>  }
> >>  
> >>  static int mma8452_read_thresh(struct iio_dev *indio_dev,
> >>
> > 
> > --
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> > 
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