Re: [PATCH v2] iio/axp288_adc: add missing channel info mask

[Jonathan Cameron <jic23@kernel.org>]

On 09/04/15 18:02, Jacob Pan wrote:
> On Thu, 09 Apr 2015 14:18:49 +0100
> Jonathan Cameron <jic23@kernel.org> wrote:
> 
>> On 06/04/15 19:38, Jacob Pan wrote:
>>> Commit 65de7654d39c70c2b ("iio: iio: Fix iio_channel_read return if
>>> channel havn't info") added a check for valid info masks.
>>>
>>> This patch adds missing channel info masks for all ADC channels.
>>> Otherwise, iio_read_channel_raw() would return -EINVAL when called
>>> by consumer drivers.
>>>
>>> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
>>
>> This makes me a little nervous. Why did we have the separate raw and
>> processed paths in the read_raw function in the first place?
>>
> Good point, I failed to explain that the reason to have separate raw and
> processed was that the raw channels happened to need some special
> processing in axp288_adc_set_ts(), since I have added a check for
> address:
> 	/* channels other than GPADC do not need to switch TS pin */
> 	if (address != AXP288_GP_ADC_H)
> 		return 0;
> 
> we no longer need special case the channels based on RAW flag. Thinking
> back it was kind of an abuse.
> 
>> Also this changes the exposed userspace ABI by dropping those
>> processed attributes that already exist..
>>
> I don't know the current users outside what we develop internally. What
> is your suggestion?
Lets go for it on the basis of it is 'fixing' your abuse of the ABI ;)
Then any users should long ago have complained about it anyway
(did I say that?) We'll take the age old approach. If no one notices we
broke the ABI then it's fine.

Have applied to the fixes-togreg branch of iio.git with the description
updated to indicate it also fixes the ABI abuse ;)

Anyhow, won't go now until after the merge window anyway I'm afraid.
Marked for stable as well.

Thanks,

Jonathan
> 
>> Jonathan
>>> ---
>>>  drivers/iio/adc/axp288_adc.c | 12 ++++++------
>>>  1 file changed, 6 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/iio/adc/axp288_adc.c
>>> b/drivers/iio/adc/axp288_adc.c index 08bcfb0..56008a8 100644
>>> --- a/drivers/iio/adc/axp288_adc.c
>>> +++ b/drivers/iio/adc/axp288_adc.c
>>> @@ -53,39 +53,42 @@ static const struct iio_chan_spec const
>>> axp288_adc_channels[] = { .channel = 0,
>>>  		.address = AXP288_TS_ADC_H,
>>>  		.datasheet_name = "TS_PIN",
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	}, {
>>>  		.indexed = 1,
>>>  		.type = IIO_TEMP,
>>>  		.channel = 1,
>>>  		.address = AXP288_PMIC_ADC_H,
>>>  		.datasheet_name = "PMIC_TEMP",
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	}, {
>>>  		.indexed = 1,
>>>  		.type = IIO_TEMP,
>>>  		.channel = 2,
>>>  		.address = AXP288_GP_ADC_H,
>>>  		.datasheet_name = "GPADC",
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	}, {
>>>  		.indexed = 1,
>>>  		.type = IIO_CURRENT,
>>>  		.channel = 3,
>>>  		.address = AXP20X_BATT_CHRG_I_H,
>>>  		.datasheet_name = "BATT_CHG_I",
>>> -		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	}, {
>>>  		.indexed = 1,
>>>  		.type = IIO_CURRENT,
>>>  		.channel = 4,
>>>  		.address = AXP20X_BATT_DISCHRG_I_H,
>>>  		.datasheet_name = "BATT_DISCHRG_I",
>>> -		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	}, {
>>>  		.indexed = 1,
>>>  		.type = IIO_VOLTAGE,
>>>  		.channel = 5,
>>>  		.address = AXP20X_BATT_V_H,
>>>  		.datasheet_name = "BATT_V",
>>> -		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>>  	},
>>>  };
>>>  
>>> @@ -151,9 +154,6 @@ static int axp288_adc_read_raw(struct iio_dev
>>> *indio_dev, chan->address))
>>>  			dev_err(&indio_dev->dev, "TS pin
>>> restore\n"); break;
>>> -	case IIO_CHAN_INFO_PROCESSED:
>>> -		ret = axp288_adc_read_channel(val, chan->address,
>>> info->regmap);
>>> -		break;
>>>  	default:
>>>  		ret = -EINVAL;
>>>  	}
>>>
>>
> 
> [Jacob Pan]
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