On Sun, 26 Nov 2006, Greg Folkert wrote:
> Okay, I have tried before here, but have been unsuccessful in making
> this device work.
>
> I have a Sandisk Sansa e250, I'd like to see it work like my other USB
> storage devices. When I plug it in, pmount and udevd and hal all do the
> right thing and it just works. Except my E250 just fails to work.
> # lsusb -v -s 001:006
>
> Bus 001 Device 006: ID 0781:7420 SanDisk Corp.
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 2.00
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 64
> idVendor 0x0781 SanDisk Corp.
> idProduct 0x7420
> bcdDevice 7.20
> iManufacturer 1 SanDisk
> iProduct 2 Sansa e250
> iSerial 3 00000000-00000000-5526b389-d921e405-00000000
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 39
> bNumInterfaces 1
> bConfigurationValue 128
> iConfiguration 0
> bmAttributes 0xc0
> Self Powered
> MaxPower 0mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 3
> bInterfaceClass 255 Vendor Specific Class
> bInterfaceSubClass 255 Vendor Specific Subclass
> bInterfaceProtocol 255 Vendor Specific Protocol
See those "Vendor Specific" thingies? They indicate that the e250 doesn't
use a standard USB mass-storage protocol. Consequently the usb-storage
driver won't talk to it.
> Device Qualifier (for other device speed):
> bLength 10
> bDescriptorType 6
> bcdUSB 2.00
> bDeviceClass 255 Vendor Specific Class
> bDeviceSubClass 255 Vendor Specific Subclass
> bDeviceProtocol 255 Vendor Specific Protocol
Same here.
Now it's possible that the device really does use a standard protocol
instead of a vendor-specific protocol, in spite of what the descriptors
say. If it does, there's a good chance the patch below will make it work.
Try it and see.
Alan Stern
Index: usb-2.6/drivers/usb/storage/unusual_devs.h
===================================================================
--- usb-2.6.orig/drivers/usb/storage/unusual_devs.h
+++ usb-2.6/drivers/usb/storage/unusual_devs.h
@@ -885,6 +885,13 @@ UNUSUAL_DEV( 0x0781, 0x0200, 0x0000, 0x
0),
#endif
+/* Reported by Greg Folkert <[EMAIL PROTECTED]> */
+UNUSUAL_DEV( 0x0781, 0x7420, 0x0720, 0x0720,
+ "Sandisk",
+ "Sansa e250",
+ US_SC_SCSI, US_PR_BULK, NULL,
+ 0),
+
#ifdef CONFIG_USB_STORAGE_FREECOM
UNUSUAL_DEV( 0x07ab, 0xfc01, 0x0000, 0x9999,
"Freecom",
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