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souts
n00b
Joined: 16 May 2004
Posts: 5
Location: Where am I?
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 Posted: Sun Jun 06, 2004 12:56 pm Post subject: cheap mp3 player - should it work? |
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First off, apologies if this question has been answered elsewhere, I've been
searching the forums and google for a day or so but can't seem to get to the
bottom of this.
I have a cheap LG MP3 player with multimedia cards - I guess the first question
is should this work like a USB card reader? If the answer is "not neccessarily",
then I suppose I'm wasting my time  and should save up for something more
expensive....
If the answer is yes, - how? I *think* I have all the SCSI & USB modules
compiled and loaded:
| Code: | Module Size Used by
sd_mod 17920 0
ohci_hcd 17860 0
usb_storage 28032 0
scsi_mod 71608 2 sd_mod,usb_storage
uhci_hcd 31888 0
ehci_hcd 25156 0
usbcore 96412 8 ohci_hcd,usblp,usb_storage,hid,uhci_hcd,ehci_hcd |
lsusb gives:
| Code: | Bus 003 Device 001: ID 0000:0000
Bus 002 Device 006: ID 043e:7001 LG Electronics USA, Inc. MF-PD100 Soul Digital MP3 Player
Bus 002 Device 002: ID 03f0:3104 Hewlett-Packard
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000 |
But the only lines that come up when the player is plugged / unplugged in dmesg
is:
| Code: | usb 2-2: USB disconnect, address 3
usb 2-2: new full speed USB device using address 4 |
i.e. it doesn't get recognised as a storage device.
This is a fresh install, with a 2.6.5-r1 kernel.
Any help at all is appreciated, even if it's a link to a post I missed 
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54902
Location: 56N 3W
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| Posted: Sun Jun 06, 2004 4:17 pm Post subject: |
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souts,
You have both the USB 1.1 hardware drivers installed (ohci_hcd and uhci_hcd). Get rid of the one that doesn't suit your hardware.
Look in /proc/bus/usb/devices to see if you have OHCI or UHCI root hubs and keep that one.
Your player is VendorID=043e ProductID=7001, which is not known to usb-storage. That doesn't mean it won't work, just that it won't work out of the box. It looks like usb-storage does not take module parameters either. That means a little light kernel hacking. Before you get into that, how does the device appear to windows?
Also, try unloading usb-storage and load it with the command
| Code: | | insmod usb-storage vendor=0x043e product=0x7001 |
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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souts
n00b
Joined: 16 May 2004
Posts: 5
Location: Where am I?
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| Posted: Sun Jun 06, 2004 5:21 pm Post subject: |
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Thanks for the hints!
I got rid of uhci-hcd, no problem.
I can't quite remember how it appeared under Windows (I do remember that the software for it was rubbish!), I'll have to check tomorrow at work 
| Code: | sh-2.05b# lsmod | grep usb
usb_storage 102288 0
usblp 12224 0
scsi_mod 71608 3 usb_storage,ide_scsi,sd_mod
usbcore 96412 7 usb_storage,ohci_hcd,usblp,hid,ehci_hcd |
| Code: | sh-2.05b# rmmod usb-storage
sh-2.05b# lsmod |grep usb
usblp 12224 0
usbcore 96412 6 ohci_hcd,usblp,hid,ehci_hcd
sh-2.05b# insmod usb-storage vendor=0x043e product=0x7001
insmod: can't read 'usb-storage': No such file or directory |
| Code: | sh-2.05b# modprobe usb-storage
sh-2.05b# lsmod | grep usb
usb_storage 102288 0
usblp 12224 0
scsi_mod 71608 3 usb_storage,ide_scsi,sd_mod
usbcore 96412 7 usb_storage,ohci_hcd,usblp,hid,ehci_hcd |
And there was me thinking insmod and modprobe were interchangeable! 
I'm game for light kernel hacking if someone's willing to talk me through it
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NeddySeagoon
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| Posted: Sun Jun 06, 2004 5:39 pm Post subject: |
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souts,
Try the Windows software under WINE.
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NeddySeagoon
Computer users fall into two groups:-
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souts
n00b
Joined: 16 May 2004
Posts: 5
Location: Where am I?
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| Posted: Sun Jun 13, 2004 4:04 pm Post subject: |
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An update:
Got a "real" card reader for £20, which works perfectly with udev & hotplug (mostly thanks to these forums).
NeddySeagoon - I was poking around in the kernel and came across $kerneldir/drivers/usb/storage/unusual_devs.h - is that the light hacking you were referring to? If so do you know how I would determine the correct setting for my mp3 player?
Cheers for your help
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NeddySeagoon
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Joined: 05 Jul 2003
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| Posted: Sun Jun 13, 2004 4:59 pm Post subject: |
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souts,
Possibly, but I was thinking of adding your player Vendor and Product IDs to usb-storage and seeing if it worked. Thats not quite so subtle as unusual devices, which wants more info.
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Regards,
NeddySeagoon
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