Re: IIO: Why cannot open two iio device node file descriptors simultaneously ?

[Aniroop Mathur <aniroop.mathur@gmail.com>]

On Sun, Aug 3, 2014 at 1:41 PM, Lars-Peter Clausen <lars@metafoo.de> wrote:
> On 08/02/2014 06:57 PM, Jonathan Cameron wrote:
> [...]
>
>>> So, even after opening iio device node,
>>> can we write the data to IIO device node from user space ?
>>> (I do not see write function in below fileops)
>>
>>
>> Indeed.  Lars was working on some buffered support for DACs but hasn't
>> yet submitted it for mainline inclusion.  Lars how is the buffered output
>> stuff coming along?
>
>
> I still need to do the re-write you wanted me to do, otherwise its working
> fine ;)
>

Great :)
So, it is possible to write data to iio fd ?

char *data;
int nbytes = 24;
int res = write(iio_fd, data, nbytes);

This will work fine ?

If yes, can you please help to tell where is write function defined ?
I could find only read function here
static const struct file_operations iio_event_chrdev_fileops = {
     .read =  iio_event_chrdev_read,
     .poll =  iio_event_poll,
     .release = iio_event_chrdev_release,
     .owner = THIS_MODULE,
     .llseek = noop_llseek,
}

> - Lars
>

Thanks,
Aniroop