Dane-Elec PhotoMate Combo

PATCH [email protected] 2 participants 2 messages Apr 28, 2001 – Apr 29, 2001

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[email protected]

author

2001-04-28 15:03 UTC #0 lore raw

I just got a Dane-Elec PhotoMate Combo SmartMedia/CompactFlash reader manufactured by SCM Microsystems. It is a USB device with ID 04e6:0005.

The http://www.qbik.ch/usb/devices/ list of supported devices calls this thing unsupported, and [email protected] writes:
"I want this to work ! I'll help testing."

I think the status can be changed to fully supported, at least it works fine in my first tests.

Changes required:
(i) in sd.c there is a peculiar code fragment that assumes that a removable disk is write protected in case the status is unknown; reversing this default allows writing to the flash card.

                if (the_result) {
-                       printk("%s: test WP failed, assume Write Protected\n", nbuff);
-                       rscsi_disks[i].write_prot = 1;
+                       printk("%s: test WP failed, assume Write Enabled\n", nbuff);
                } else {
                        rscsi_disks[i].write_prot = ((buffer[2] & 0x80) != 0);

(ii) this card needs usb/storage/dpcm.c which is compiled when CONFIG_USB_STORAGE_DPCM is set, but this variable is missing from usb/Config.in. Add it.

(iii) add to unusual_devs.h:

diff -u --recursive --new-file ../linux-2.4.3/linux/drivers/usb/storage/unusual_devs.h ./l\
inux/drivers/usb/storage/unusual_devs.h

linux/drivers/usb/storage/unusual_devs.h Sat Apr 28 14:39:20 2001 renamed from linux-2.4.3/linux/drivers/usb/storage/unusual_devs.h Sun Apr 1 20:44:19 2001 +6 -0

@@ -79,6 +79,12 @@
                "CameraMate (DPCM_USB)",
                US_SC_SCSI, US_PR_DPCM_USB, NULL,
                US_FL_START_STOP ),
+
+UNUSUAL_DEV(  0x04e6, 0x0005, 0x0100, 0x0208,
+               "SCM Microsystems Inc",
+               "eUSB SmartMedia / CompactFlash Adapter",
+               US_SC_SCSI, US_PR_DPCM_USB, NULL,
+               US_FL_START_STOP ),
 #endif

Maybe the device is slow, and I got read errors with a Compact Flash card in the reader at boot time. A "blockdev --rereadpt /dev/sdX" worked.

Andries

Matthew Dharm

2001-04-29 01:06 UTC #1 lore raw

Quoted 7 lines · On Sat, Apr 28, 2001 at 05:02:21PM +0200, [email protected] wrote:

I just got a Dane-Elec PhotoMate Combo SmartMedia/CompactFlash reader manufactured by SCM Microsystems. It is a USB device with ID 04e6:0005.
The http://www.qbik.ch/usb/devices/ list of supported devices calls this thing unsupported, and [email protected] writes:
"I want this to work ! I'll help testing."

Quoted 7 lines

I think the status can be changed to fully supported, at least it works fine in my first tests.
Changes required:
(i) in sd.c there is a peculiar code fragment that assumes that a removable disk is write protected in case the status is unknown; reversing this default allows writing to the flash card.

This is an unsafe assumption. The code fragment you call "peculiar" is definately necessary.

Quoted 3 lines

(ii) this card needs usb/storage/dpcm.c which is compiled when CONFIG_USB_STORAGE_DPCM is set, but this variable is missing from usb/Config.in. Add it.

This config option is considered so immature that it's not ready for the kernel config, even as an EXPERIMENTAL. Use it at your own risk.

Matt

Signature · 6 lines

Matthew Dharm                              Home: [email protected] 
Maintainer, Linux USB Mass Storage Driver

A female who groks UNIX?  My universe is collapsing.
					-- Mike
User Friendly, 10/11/1998