Alan thanks for quick response.
By index I mean local "index" variable in drive/usb/device.c [function
usb_device_dump]. As if I understand, the below snippet from
drive/usb/device.c writes topology;
static ssize_t usb_device_dump(char **buffer, size_t *nbytes, loff_t
*skip_bytes, loff_t *file_offset, struct usb_device *usbdev, struct
usb_bus *bus, int level, int index, int count)
{
.................
.................
data_end = pages_start + sprintf(pages_start, format_topo,
bus->busnum, level, parent_devnum,
index, count, usbdev->devnum,
speed, usbdev->maxchild);
.........
}
I can access busnum,parent_devnum,devnum,maxchild,speed in
driver/usb/storage/scsiglue.c as follows:
static int proc_info (char *buffer, char **start, off_t offset, int
length,int hostno, int inout)
> {
> ............
> /* ADDING bus & prnt */
> SPRINTF(" Bus: %d\n",us->pusb_dev->bus->busnum);
> SPRINTF(" prnt: %d\n",us->pusb_dev->parent->devnum);
> SPRINTF(" prnt: %d\n",us->pusb_dev->devnum);
> SPRINTF(" prnt: %d\n",us->pusb_dev->maxchild);
> /*ADDITION ENDS */
.........
}
But I'm not able to access "level" "index" and "count" variable in
proc_info function as they are local variables.
I have observed that first four fields (busno,lev,prnt,port) are always
unique to each connected device. Please correct me if I'm wrong.
Thanks,
Brijesh
-----Original Message-----
From: Alan Stern [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 24, 2005 10:37 AM
To: Singh, Brijeshkumar
Cc: [email protected]
Subject: RE: [linux-usb-devel] RE: how to distinguish two device if they
does not provide serial number!
On Wed, 24 Aug 2005, Singh, Brijeshkumar wrote:
> Hi Alan,
>
> Thanks for help.
>
> Unfortunately my system has four USB bus. Hence I am not to use the
method you suggested. I was exploring possibility of adding little
additional information in /proc/scsi/usb-storage-A/B. The information
should be something like:
> [EMAIL PROTECTED] usb]# cat /proc/scsi/usb-storage-1/2
> Host scsi2: usb-storage
> Vendor: Genesyslogic
> Product: USB Mass Storage Device
> Serial Number: None
> Protocol: 8020i
> Transport: Bulk
> GUID: 05e307010000000000000000
> Attached: Yes
> Bus : 1
> Lev : 1
> Prnt: 1
> Port: 0
> [EMAIL PROTECTED] usb]#
>
> The above file will solve my entire problem.
>
> I have added few lines in drive/usb/storage/scsiglue.c
>
> static int proc_info (char *buffer, char **start, off_t offset, int
length,int hostno, int inout)
> {
> ................
> /* ADDING bus & prnt */
> SPRINTF(" Bus: %d\n",us->pusb_dev->bus->busnum);
> SPRINTF(" prnt: %d\n",us->pusb_dev->parent->devnum);
> /*ADDITION ENDS */
> }
>
> But don't know how to get other filed ("level" and "index").
> Please guide me how to solve this problem.
By "index", I assume you mean the Dev# field. It's enough to know the
Dev# and the Bus, because they uniquely determine a USB device. You
don't
need the level, port, or parent fields, since you can read them from
/proc/bus/usb/devices.
The Dev# is us->pusb_dev->devnum.
Alan Stern
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