Unable to use Own USB Module

Unable to use Own USB Module

[Kumar Gaurav]

Hi All,

I'm a newbie so please don't spare me if this question seems too amateur.

I wanted to try making a basic USB module and use it for test so that i 
can get basic understanding of working of USB modules.

I compiled and booted with kernel 3.11-rc2 with USB_STORAGE=Y following
	http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09.html#lkn_usb_storage

Iut i'm unable to find module using my USB. i gave a blind attempt of 
"rmmod usb-storage" (just thought if usb-storage is present) but no 
luck. my dmesg show following
====================
 > [ 5610.837681] hub 2-1:1.0: state 7 ports 6 chg 0000 evt 0004 
 
 

 > [ 5610.837972] hub 2-1:1.0: port 2, status 0100, change 0001, 12 Mb/s 
 
 

 > [ 5610.837984] usb 2-1.2: USB disconnect, device number 8 
 
 

 > [ 5610.837989] usb 2-1.2: unregistering device 
 
 

 > [ 5610.837995] usb 2-1.2: unregistering interface 2-1.2:1.0 
 
 

 > [ 5610.839598] usb 2-1.2: usb_disable_device nuking all URBs 
 
 

 > [ 5610.945813] hub 2-1:1.0: debounce: port 2: total 100ms stable 
100ms status 0x100
 > [ 5620.830115] hub 2-1:1.0: state 7 ports 6 chg 0000 evt 0004
 > [ 5620.830400] hub 2-1:1.0: port 2, status 0101, change 0001, 12 Mb/s
 > [ 5620.934424] hub 2-1:1.0: debounce: port 2: total 100ms stable 
100ms status 0x101
 > [ 5620.945442] hub 2-1:1.0: port 2 not reset yet, waiting 10ms
 > [ 5621.007351] usb 2-1.2: new high-speed USB device number 9 using 
ehci-pci
 > [ 5621.018348] hub 2-1:1.0: port 2 not reset yet, waiting 10ms
 > [ 5621.093327] usb 2-1.2: default language 0x0409
 > [ 5621.095323] usb 2-1.2: udev 9, busnum 2, minor = 136
 > [ 5621.095334] usb 2-1.2: New USB device found, idVendor\x03f0, 
idProductV07
 > [ 5621.095340] usb 2-1.2: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
 > [ 5621.095345] usb 2-1.2: Product: v210w
 > [ 5621.095350] usb 2-1.2: Manufacturer: HP
 > [ 5621.095355] usb 2-1.2: SerialNumber: 0000000000000026
 > [ 5621.095484] usb 2-1.2: usb_probe_device
 > [ 5621.095492] usb 2-1.2: configuration #1 chosen from 1 choice
 > [ 5621.095662] usb 2-1.2: adding 2-1.2:1.0 (config #1, interface 0)
 > [ 5621.095778] usb-storage 2-1.2:1.0: usb_probe_interface
 > [ 5621.095799] usb-storage 2-1.2:1.0: usb_probe_interface - got id
 > [ 5621.095807] usb-storage 2-1.2:1.0: USB Mass Storage device detected
 > [ 5621.095990] scsi9 : usb-storage 2-1.2:1.0
 > [ 5622.099125] scsi 9:0:0:0: Direct-Access     hp       v210w 
     0.00 PQ: 0 ANSI: 4
 > [ 5622.099270] sd 9:0:0:0: Attached scsi generic sg2 type 0
 > [ 5622.101119] sd 9:0:0:0: [sdb] 15773696 512-byte logical blocks: 
(8.07 GB/7.52 GiB)
 > [ 5622.102499] sd 9:0:0:0: [sdb] Write Protect is off
 > [ 5622.102504] sd 9:0:0:0: [sdb] Mode Sense: 23 00 00 00
 > [ 5622.103771] sd 9:0:0:0: [sdb] Write cache: disabled, read cache: 
enabled, doesn't support DPO or FUA
 > [ 5622.113635]  sdb: sdb1
 > [ 5622.130293] sd 9:0:0:0: [sdb] Attached SCSI removable disk
============================================

My device is using device driver "ehci-pci" but no module

Again i don't understand what is the difference b/w device driver  and 
modules (i used to think that both are same).
What can be the method of using my module to use my USB(mass storage 
device).
when i'm using the default kernel provided by my kubuntu 12.04 ie 
"3.2.0-37-generic" i'm able to rmmod usb-storage. But i wanna try with 
3.11-rc2.

Please help

Regards
Kumar gaurav

Re: Unable to use Own USB Module

[Greg Kroah-Hartman]

On Tue, Jul 30, 2013 at 09:10:02PM +0530, Kumar Gaurav wrote:
> Hi All,
> 
> I'm a newbie so please don't spare me if this question seems too amateur.
> 
> I wanted to try making a basic USB module and use it for test so
> that i can get basic understanding of working of USB modules.
> 
> I compiled and booted with kernel 3.11-rc2 with USB_STORAGE=Y following
> 	http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09.html#lkn_usb_storage
> 
> Iut i'm unable to find module using my USB.

That's because you told it to be built into the kernel, not a module.

And you really don't want to mess around with usb-storage as a "first
attempt", it's one of the most complex things that USB does (it's really
SCSI over USB), so it's not easy at all.

good luck,

greg k-h

Re: Unable to use Own USB Module

[Kumar Gaurav]

On Tuesday 30 July 2013 09:44 PM, Greg Kroah-Hartman wrote:
> On Tue, Jul 30, 2013 at 09:10:02PM +0530, Kumar Gaurav wrote:
>> Hi All,
>>
>> I'm a newbie so please don't spare me if this question seems too amateur.
>>
>> I wanted to try making a basic USB module and use it for test so
>> that i can get basic understanding of working of USB modules.
>>
>> I compiled and booted with kernel 3.11-rc2 with USB_STORAGE=Y following
>> 	http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09.html#lkn_usb_storage
>>
>> Iut i'm unable to find module using my USB.
>
> That's because you told it to be built into the kernel, not a module.
>
> And you really don't want to mess around with usb-storage as a "first
> attempt", it's one of the most complex things that USB does (it's really
> SCSI over USB), so it's not easy at all.
>
> good luck,
>
> greg k-h
>
Hi greg,

Thanks for your help and i'm gonna try it out.
Can you suggest me that what can i start with specifically in USB.
I tried sending patch from staging area for correction on coding style 
issue. but wanna try out on some real bug. Currently just experimenting 
with one of your document "Write a real Linux driver".


Regards,
Kumar Gaurav

Re: Unable to use Own USB Module

[Greg Kroah-Hartman]

On Tue, Jul 30, 2013 at 09:59:01PM +0530, Kumar Gaurav wrote:
> Can you suggest me that what can i start with specifically in USB.

Whatever you are interested in.

If something isn't working for you, try to fix it, that's the best way
instead of having others tell you what to work on.

Best of luck,

greg k-h