Re: [Linux-usb-users] Do I need write a device driver?

[Qiu ZhongLe]

Hi,Brad:

 Using the hiddev ioctl() API I can write/read a 32-bit data
(my test shows only low-7 bits works,although  hiddev_usage_ref.value 's 
definition is __s32.I havn't found the reason yet) using
ioctl(**,HIDIOCSUSAGE,**) ,*HIDIOCSREPORT,*HIDIOCGREPORT*,*HIDIOCGUSAGE*;
Does it exist one method to write/read sevral bytes one time only using 
hiddev driver's API?
 Tell me if not exist,then I decided to write a driver additional for 
transferring data.
 Thanks!
Qiu




From: Brad Hards <[EMAIL PROTECTED]>
To: Qiu ZhongLe <[EMAIL PROTECTED]>, 
[EMAIL PROTECTED]
Subject: Re: [Linux-usb-users] Do I need write a device driver?

On Wed, 23 Jul 2003 12:04 pm, Qiu ZhongLe wrote:
>  ?When I plugged in My device(HID-class),the system(version2.4.18) can
> detect it,and I can find my device at "/proc/bus/usb/devices" ,I even 
wrote
> a program which can open it and print the
> vendor and product information.But I do need to exchange data between
> device and host,
> I think I should use "usb_submit_urb()" to transfer data.
Why? What is the device? What is the intended usage? That makes a 
difference
to the API you should use.

> ??o I need to write a device driver?
Perhaps, but probably not in kernel space.
> ??an I read data and write data without my own driver? I mean ,maybe I
> only need write
> a read/write function.
Yes, the input API or hiddev API may be suitable. However it depends on 
your
device (in particular, the intended usage, and the HID Application) and 
what
you need to do.

Brad
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