On 07/06/2012 06:45 PM, anish kumar wrote: > On Fri, 2012-07-06 at 14:25 +0100, Jonathan Cameron wrote: >> On 7/6/2012 1:00 PM, anish singh wrote: >>> Hello Jonathan, >>> >>> I would be extremely happy if I can get your opinion on this. >>> >>> Recently Myungjoo Ham had posted Extcon: adc-jack driver patch. >>> >>> Description of this driver: >>> This is basically a Headset(jack) driver.Once the headset is inserted >>> a irq_handler is called and in this handler we have a callback(this >>> callback calls into pmic driver to get the adc value) to get >>> the adc value to determine the kind of headset: This headset could >>> be headset with mic, headset without mic or headset with >>> keys(volume-up/down) attached to it.One we have found out the kind >>> of headset we use extcon framework to notify the other interested drivers or >>> userspace that a headset with so and so capabilities has been inserted. >>> >>> Question: >>> Does this driver fall into IIO as pointed by Mark Brown in his review comments? >> The driver itself probably doesn't, but the adc part does in that IIO >> provides a means of talking to the relevant adc. >>> >>> Why do we need to use IIO to get the adc value?As for different boards the >>> method of getting adc is different.How does IIO help in this? >> Ultimately, IIO in this case is acting as an infrastructure for ALL >> adcs. E.g. for different boards you'll need a mapping to tell it which >> adc channel is connected but that is it. Hence you don't need a >> specific callback for each pmic as you will be using generic interfaces >> to query it. > After having a brief glance at IIO below is my understanding: > IIO is used to provide standard interfaces in the form of sysfs to > userspace _ONLY_. > > My requirement: > ADC-JACK-Driver should get the adc value from other driver i.e. PMIC > driver.Here the requirement is communication between two drivers in > kernel.Can IIO be used here? > > I had a look at drivers/staging/iio/Documentation/Overview.txt and some > ADC drivers. Hi, There is a new experimental in kernel API, which lets you write IIO clients in the kernel. See: drivers/iio/inkern.h and drivers/staging/iio/iio_hwmon.c - Lars -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
