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.
Thanks,
Brijesh
-----Original Message-----
From: Alan Stern [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 24, 2005 7:29 AM
To: Singh, Brijeshkumar
Cc: linux-usb-devel@lists.sourceforge.net
Subject: Re: [linux-usb-devel] RE: how to distinguish two device if they does
not provide serial number!
On Tue, 23 Aug 2005, Singh, Brijeshkumar wrote:
> Hi,
>
> Two CD-ROM's (from same vendor) are connected on Linux machine, running
> 2.4.20 kernel. I am not able to relate the topology of individual CD-ROMs.
>
> # cat /proc/bus/usb/devices
>
> T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=05e3 ProdID=0701 Rev= 0.33
> S: Manufacturer=Genesyslogic
> S: Product=USB Mass Storage Device
> C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 4mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=02 Prot=50 Driver=usb-storage
> E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
> E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
> T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 2 Spd=12 MxCh= 0
> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=05e3 ProdID=0701 Rev= 0.02
> S: Manufacturer=Genesyslogic
> S: Product=USB Mass Storage Device
> C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 4mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=02 Prot=50 Driver=usb-storage
> E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
> E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
>
> [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
>
> [EMAIL PROTECTED] usb]# cat /proc/scsi/usb-storage-2/3
> Host scsi3: usb-storage
> Vendor: Genesyslogic
> Product: USB Mass Storage Device
> Serial Number: None
> Protocol: 8020i
> Transport: Bulk
> GUID: 05e307010000000000000000
> Attached: Yes
>
> I am not able to understand which topology field belong to which storage
> device.
>
> Please guide me how to relate the /proc/bus/usb/devices file with
> /proc/scsi/usb-storage-?/?
In this case you can tell because the usb-storage index numbers are
allocated in increasing order, as are the SCSI host numbers and the USB
device numbers.
In /proc/scsi/usb-storage-A/B, A is the usb-storage index number and B is
the SCSI host number. In /proc/bus/usb/devices, the Dev# field on the T
line is the USB device number. Hence the entry with Dev#=2 goes with
usb-storage-1/2 and Dev#=3 goes with usb-storage-2/3.
This scheme won't work if you have more than one USB bus, because device
numbers are allocated independently for the separate buses. Ultimately
the only way to match the entries up is by looking at the information in
the system log.
Incidentally, the whole process is a lot easier with Linux 2.6.
Alan Stern
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