Messages in this thread | | | Date | Sun, 14 Jul 2013 23:57:24 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse interfaces |
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Hello.
On 07/14/2013 12:12 PM, Lars-Peter Clausen wrote:
>>>>> And are you sure you want to control this through sysfs? There's no >>>>> other better user/kernel apis for it?
>>>> I found none, besides ioctl(), as the device driven is rather >>>> unique. But I thought that sysfs is "ioctl() today", so I went with it...
>>> It does sound like it would fit better into IIO than just a misc driver, >>> even if it's the only hardware of its kind.
>> I got somewhat familiarized myself with drivers/iio/ infrastructure and I >> have found a place only the for ADC device in which the customer currently >> has no interest. >> The other trouble is that I'll have to backport this driver to 3.4 which >> doesn't contain the IIO infrastructure at all. :-(
> It has, it's just still in staging in 3.4. But the API (except for minor > modifications) and more importantly the ABI are the same.
Thank you for the useful information. I wouldn't probably have figured it out to search there.
> There is a angular velocity channel type in IIO. maybe that could be used to > report the Speed-Pulse-ADC values.
You probably misunderstood from my terse description. Multichannel ADC interface is separate from the speed-pulse interface which has on its single input digital PWM signal of varying frequency. Speed pulse i/f measures pulse count and period. I've found no adequate channel type in IIO infrastructure so far. I'll mail the IIO maintainers with a request for help probably...
> - Lars
WBR, Sergei
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