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Date: Sat, 22 Oct 2016 19:38:18 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Peter Meerwald-Stadler <pmeerw@...erw.net>
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 17/10/16 22:10, Peter Meerwald-Stadler wrote:
> 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>
Added to both this and the raw reads patch (on basis I'm assuming you
don't mind that one
>
>> 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,
>>>
>>
>
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