linux-kernel - Re: [PATCH] staging:iio:proof of concept in kernel interface.

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Date:	Sun, 16 Oct 2011 20:45:06 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	zdevai@...il.com
Subject: Re: [PATCH] staging:iio:proof of concept in kernel interface.

2011/10/14 Jonathan Cameron <jic23@....ac.uk>:

> I'm trying to work out what our equivalent of the clk finding api is.

Judging from the ideal use of our in-tree driver
drivers/mfd/ab8500-gpadc.c a map like this would be
great

struct adc_map {
        struct device *adc_dev;
        const char *adc_dev_name;
        const char *channel;
        struct device *dev;
        const char *dev_name;
};

{ adc_dev, adc_dev_name } are alternative-compulsory identifiers for
the ADC

channel: string identifying the channel on the ADC, strings have
been shown to be good for identifying things.

{ dev, dev_name } are alternative-compulsory identifiers for the
ADC client.

struct device * pointers take precedence, fallback to names if device
pointers are unavailable.

adc_dev_name is the name of the ADC and then I mean what is returned
from it's struct device *dev when you do dev_name() on it. dev_name is
well dev_name(dev);

Then this API feels comfortable:

struct adc *adc_get(struct device *dev, const char *channel);
void adc_put(struct adc *adc);
int adc_read_raw(struct adc *adc, int *val);

We can then add adc_read_voltage(), adc_read_temperature(), adc_read_foo() ...

Usage in say a hwmon driver or whatever:

struct adc *mr_adc = adc_get(dev, NULL);
/*
 * Optional channel parameter used only when a single
 * device use more than one channel, as with clock names
 * or regulator names, so pass in NULL for the one channel
 * tied to this device.
 */
ret = adc_read_raw(mr_adc, &val);
(...)
adc_put(mr_adc);

But this is just what looks useful to us.

Yours,
Linus Walleij
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