linux-kernel - Re: [PATCH v3 4/5] iio: mxs-lradc: add scale

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Date:	Tue, 23 Jul 2013 15:25:25 +0200
From:	Hector Palacios <hector.palacios@...i.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"jic23@...nel.org" <jic23@...nel.org>,
	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>,
	"marex@...x.de" <marex@...x.de>
Subject: Re: [PATCH v3 4/5] iio: mxs-lradc: add scale_available file to channels

Dear Lars,

On 07/23/2013 10:46 AM, Lars-Peter Clausen wrote:
> On 07/22/2013 04:04 PM, Hector Palacios wrote:
> [...]
>>
>> +static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
>> +		struct device_attribute *attr,
>> +		char *buf,
>> +		int ch)
>> +{
>> +	struct iio_dev *iio = dev_to_iio_dev(dev);
>> +	struct mxs_lradc *lradc = iio_priv(iio);
>> +	int i, len = 0;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
>> +		len += sprintf(buf + len, "%d.%09u ",
>> +			       lradc->scale_avail[ch][i].integer,
>> +			       lradc->scale_avail[ch][i].nano);
>> +
>> +	len += sprintf(buf + len, "\n");
>> +
>> +	return len;
>> +}
>> +
>> +static ssize_t mxs_lradc_show_scale_available(struct device *dev,
>> +		struct device_attribute *attr,
>> +		char *buf)
>> +{
>> +	struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
>> +
>> +	return mxs_lradc_show_scale_available_ch(dev, attr, buf,
>> +						 iio_attr->address);
>> +}
>> +
>> +#define SHOW_SCALE_AVAILABLE_ATTR(ch)					\
>> +static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO,	\
>> +		       mxs_lradc_show_scale_available, NULL, ch)
>> +
>> +SHOW_SCALE_AVAILABLE_ATTR(0);
>> +SHOW_SCALE_AVAILABLE_ATTR(1);
>> +SHOW_SCALE_AVAILABLE_ATTR(2);
>> +SHOW_SCALE_AVAILABLE_ATTR(3);
>> +SHOW_SCALE_AVAILABLE_ATTR(4);
>> +SHOW_SCALE_AVAILABLE_ATTR(5);
>> +SHOW_SCALE_AVAILABLE_ATTR(6);
>> +SHOW_SCALE_AVAILABLE_ATTR(7);
>> +SHOW_SCALE_AVAILABLE_ATTR(8);
>> +SHOW_SCALE_AVAILABLE_ATTR(9);
>> +SHOW_SCALE_AVAILABLE_ATTR(10);
>> +SHOW_SCALE_AVAILABLE_ATTR(11);
>> +SHOW_SCALE_AVAILABLE_ATTR(12);
>> +SHOW_SCALE_AVAILABLE_ATTR(13);
>> +SHOW_SCALE_AVAILABLE_ATTR(14);
>> +SHOW_SCALE_AVAILABLE_ATTR(15);
>> +
>> +static struct attribute *mxs_lradc_attributes[] = {
>> +	&iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage8_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage9_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
>> +	&iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
>> +	NULL
>> +};
>
> This should really be using the iio_chan_spec_ext_info infrastructure. Bonus
> points for factoring out the common code used to calculate and display the
> scales.

I perfectly understand. Sadly, I don't currently have the time and expertise to try to 
work this out the proper way. It already took much longer than expected to have this 
driver toggle a divider flag.

I'd appreciate if anyone wishes to complete this job.
@Alexander, please feel free to submit your other temp patch without waiting for this one.

Best regards,
--
Hector Palacios
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