Salut,
bastgiraud <[EMAIL PROTECTED]> writes:
>
> I would like to read and write informations (just some bytes) with USB.
> (For information my device is a pic which works in low
> speed in interruptb transfer but it's not important
> because the above program send me information from device
> properly.) That works properly under windows... And now
> reading from device is succeful under linus-2.4.20.
>
> I use the file /dev/usb/hiddev0.
>
> FILEDES=open("/dev/usb/hiddev0",O_RDONLY);
>
> When I try to write in fd errno return me the value
> 22(EINVAL) although I open fd in O_WRONLY or O_RDWR...
I guess writing is not supported by hiddev,
from linux-2.6.8-rc3/drivers/usb/input/hiddev.c :
/*
* "write" file op
*/
static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t
count, loff_t *ppos)
{
return -EINVAL;
}
Jürgen
--
Jürgen Stuber <[EMAIL PROTECTED]>
http://www.jstuber.net/
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