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Date: Mon, 17 Oct 2016 23:10:24 +0200 (CEST)
From: Peter Meerwald-Stadler <pmeerw@...erw.net>
To: Jonathan Cameron <jic23@...nel.org>
cc: Alison Schofield <amsfield22@...il.com>, knaack.h@....de,
lars@...afoo.de, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: light: ltr501: claim direct mode during raw
writes
On Sun, 16 Oct 2016, Jonathan Cameron wrote:
> On 16/10/16 06:02, 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 raw write operations.
> >
> > Signed-off-by: Alison Schofield <amsfield22@...il.com>
> > ---
> > Changes in v2:
> > Replaced 'goto release' statements with breaks.
> > The release helper function remains in the same place as in version
> > one of patch, but now break statements control the flow rather than
> > jumping out with goto's.
> >
> > I may have 'break'd more than needed at tail end of nested switch.
> > Tried to follow official c language definition.
> >
> I'd have done it exactly the same
>
> Applied to the togreg branch of iio.git. Again, Peter, if you have
> a chance to look at this that would be great. If not then not to worry!
Acked-by: Peter Meerwald-Stadler <pmeerw@...erw.net>
> Jonathan
> >
> > drivers/iio/light/ltr501.c | 81 +++++++++++++++++++++++++++++-----------------
> > 1 file changed, 51 insertions(+), 30 deletions(-)
> >
> > diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
> > index 3afc53a..8f9d5cf 100644
> > --- a/drivers/iio/light/ltr501.c
> > +++ b/drivers/iio/light/ltr501.c
> > @@ -729,8 +729,9 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
> > int i, ret, freq_val, freq_val2;
> > struct ltr501_chip_info *info = data->chip_info;
> >
> > - 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_SCALE:
> > @@ -739,85 +740,105 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
> > i = ltr501_get_gain_index(info->als_gain,
> > info->als_gain_tbl_size,
> > val, val2);
> > - if (i < 0)
> > - return -EINVAL;
> > + if (i < 0) {
> > + ret = -EINVAL;
> > + break;
> > + }
> >
> > data->als_contr &= ~info->als_gain_mask;
> > data->als_contr |= i << info->als_gain_shift;
> >
> > - return regmap_write(data->regmap, LTR501_ALS_CONTR,
> > - data->als_contr);
> > + ret = regmap_write(data->regmap, LTR501_ALS_CONTR,
> > + data->als_contr);
> > + break;
> > case IIO_PROXIMITY:
> > i = ltr501_get_gain_index(info->ps_gain,
> > info->ps_gain_tbl_size,
> > val, val2);
> > - if (i < 0)
> > - return -EINVAL;
> > + if (i < 0) {
> > + ret = -EINVAL;
> > + break;
> > + }
> > data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
> > data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
> >
> > - return regmap_write(data->regmap, LTR501_PS_CONTR,
> > - data->ps_contr);
> > + ret = regmap_write(data->regmap, LTR501_PS_CONTR,
> > + data->ps_contr);
> > + break;
> > default:
> > - return -EINVAL;
> > + ret = -EINVAL;
> > + break;
> > }
> > + break;
> > +
> > case IIO_CHAN_INFO_INT_TIME:
> > switch (chan->type) {
> > case IIO_INTENSITY:
> > - if (val != 0)
> > - return -EINVAL;
> > + if (val != 0) {
> > + ret = -EINVAL;
> > + break;
> > + }
> > mutex_lock(&data->lock_als);
> > - i = ltr501_set_it_time(data, val2);
> > + ret = ltr501_set_it_time(data, val2);
> > mutex_unlock(&data->lock_als);
> > - return i;
> > + break;
> > default:
> > - return -EINVAL;
> > + ret = -EINVAL;
> > + break;
> > }
> > + break;
> > +
> > case IIO_CHAN_INFO_SAMP_FREQ:
> > switch (chan->type) {
> > case IIO_INTENSITY:
> > ret = ltr501_als_read_samp_freq(data, &freq_val,
> > &freq_val2);
> > if (ret < 0)
> > - return ret;
> > + break;
> >
> > ret = ltr501_als_write_samp_freq(data, val, val2);
> > if (ret < 0)
> > - return ret;
> > + break;
> >
> > /* update persistence count when changing frequency */
> > ret = ltr501_write_intr_prst(data, chan->type,
> > 0, data->als_period);
> >
> > if (ret < 0)
> > - return ltr501_als_write_samp_freq(data,
> > - freq_val,
> > - freq_val2);
> > - return ret;
> > + ret = ltr501_als_write_samp_freq(data, freq_val,
> > + freq_val2);
> > + break;
> > case IIO_PROXIMITY:
> > ret = ltr501_ps_read_samp_freq(data, &freq_val,
> > &freq_val2);
> > if (ret < 0)
> > - return ret;
> > + break;
> >
> > ret = ltr501_ps_write_samp_freq(data, val, val2);
> > if (ret < 0)
> > - return ret;
> > + break;
> >
> > /* update persistence count when changing frequency */
> > ret = ltr501_write_intr_prst(data, chan->type,
> > 0, data->ps_period);
> >
> > if (ret < 0)
> > - return ltr501_ps_write_samp_freq(data,
> > - freq_val,
> > - freq_val2);
> > - return ret;
> > + ret = ltr501_ps_write_samp_freq(data, freq_val,
> > + freq_val2);
> > + break;
> > default:
> > - return -EINVAL;
> > + ret = -EINVAL;
> > + break;
> > }
> > + break;
> > +
> > + default:
> > + ret = -EINVAL;
> > + break;
> > }
> > - return -EINVAL;
> > +
> > + iio_device_release_direct_mode(indio_dev);
> > + return ret;
> > }
> >
> > static int ltr501_read_thresh(struct iio_dev *indio_dev,
> >
>
--
Peter Meerwald-Stadler
+43-664-2444418 (mobile)
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