Re: iio: dht11 broken

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Dec 1, 2014 at 11:59 AM, Richard Weinberger <richard@xxxxxx> wrote:
> Am 01.12.2014 um 11:49 schrieb Harald Geyer:

>> Any input from gpiolib people about what the proper fix would be in
>> their opinion, of course is appreciated. I don't think the dht11 driver
>> is doing anything unreasonable per se, so maybe they can clarify how
>> the API is intended to be used?
>
> Your driver sets up a GPIO as IRQ and then you switch the mode to output
> to enable the DHT sensor.
> This is not an API issue, it is an design issue.
> I'm not a hardware expert but AFAIK setting an IRQ pin into output mode can
> lead to undefined behavior.

Well that check is there exactly to prevent madness like this.

IRQs on pins set to output *does* *not* *make* *sense*.

Remove the IRQ before setting the pin to output and vice
versa and everyone will be happier.

Yours,
Linus Walleij
--
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




[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Input]     [Linux Kernel]     [Linux SCSI]     [X.org]

  Powered by Linux