Hi,
As written in my mail titled: "Linux sysfs usb descriptors
file has broken configuration length handling"
I've been taking a close look at the usb sysfs handling
code, specifically for the descriptors sysfs file.
One other difference I've noticed is that the usbfs
code for reading the descr
Hi All,
While working on libusb's descriptor parsing code I ended up
referencing the kernels drivers/usb/core/sysfs.c and
drivers/usb/core/devio.c files. And I noticed a worrisome
discrepancy.
The sysfs descriptors file for a usb device, as well
as its /dev/bus/usb/xxx/yyy device node both behav
On Fri, 17 May 2013, Daniel Santos wrote:
> Hello. I'm working on a driver for a USB to SPI bridge chip
> (Microchip's MCP2210) that acts as a HID device (generic subclass). Of
> course, it can be used from user-space via hid-generic, but I'm not
> really interested in that. I started this wor
On Sat, 18 May 2013, Hans de Goede wrote:
> Hi,
>
> As written in my mail titled: "Linux sysfs usb descriptors
> file has broken configuration length handling"
>
> I've been taking a close look at the usb sysfs handling
> code, specifically for the descriptors sysfs file.
>
> One other differen
On Sat, 18 May 2013, Hans de Goede wrote:
> Hi All,
>
> While working on libusb's descriptor parsing code I ended up
> referencing the kernels drivers/usb/core/sysfs.c and
> drivers/usb/core/devio.c files. And I noticed a worrisome
> discrepancy.
>
> The sysfs descriptors file for a usb device,
On Sat, May 18, 2013 at 12:14:08PM -0400, Alan Stern wrote:
> On Sat, 18 May 2013, Hans de Goede wrote:
> > But the sysfs descriptors file will just packs the
> > rawdescriptors one behind the other, using
> > usb_device->config[x].desc.wTotalLength, where as
> > userspace only sees the length adve
The HID protocol is a separate specification, see the usb-if.org web
site for it.
Thank you, found it! It's quite a read and I think I see where I've
gone wrong. I've made some terrible assumptions it would appear! :)
That's ok, I've had fun and learned a lot thus far.
Daniel
--
To unsubs
First off, thanks for your helpful response! :)
On 05/18/2013 10:53 AM, Alan Stern wrote:
On Fri, 17 May 2013, Daniel Santos wrote:
Hello. I'm working on a driver for a USB to SPI bridge chip
(Microchip's MCP2210) that acts as a HID device (generic subclass). Of
course, it can be used from us
Hi, Greg, Alan, All,
On 05/18/2013 06:17 PM, Greg KH wrote:
On Sat, May 18, 2013 at 12:14:08PM -0400, Alan Stern wrote:
On Sat, 18 May 2013, Hans de Goede wrote:
But the sysfs descriptors file will just packs the
rawdescriptors one behind the other, using
usb_device->config[x].desc.wTotalLengt
