Hi,
I believe I have fixed a problem with my iTegno GPRS modem using the
pl2303.c driver.
System:
Linux 2.4.21-rc2 from linuxusb.bkbits.net
Intel Celeron 1.7ghz CPU
Intel 82801DB ICH4
usb-uhci bus driver
pl2303.c device driver
iTegno GPRS modem WM1080
Symptom:
On system reboots, GPRS modem does not come up. Console reports the
following message:
---
hub.c: new USB device 00:1d.1-2, assigned address 3
host/usb-uhci.c: interrupt, status 2, frame# 169
usb.c: USB device not accepting new address=3 (error=-110)
hub.c: new USB device 00:1d.1-2, assigned address 4
usb.c: USB device not accepting new address=4 (error=-110)
---
Steps to Reproduce:
1) Boot up Linux with GPRS modem attached
2) Wait until green light on modem starts flashing.
3) Dial-up into network ("pppd call gprs")
4) reboot system (/sbin/reboot or reboot button on case)
5) On Linux boot up, error message will indicate USB GPRS modem not
registered.
Fix:
Problem cannot be reproduced running Windows 2000 on same hardware using
iTegno's shipped drivers. Also, problem only occured if the serial port
was opened. I then used a USB snooper and noticed that the Windows driver
does not send certain VENDOR_WRITE_REQUEST messages when opening the port.
Removing these messages from the Linux driver fixed the problem.
Question to Greg KH or anyone:
Could someone tell me what these magic messages are supposed to do, so I
can make sure I didn't break anything? Thanks,
Eli
--- >8 ---
diff -u -r1.1.1.2 pl2303.c
--- drivers/usb/serial/pl2303.c 2003/05/13 04:14:35 1.1.1.2
+++ drivers/usb/serial/pl2303.c 2003/07/31 04:05:45
@@ -265,13 +265,6 @@
dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
-
- i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
- VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
- 0, 1, NULL, 0, 100);
-
- dbg ("0x40:1:0:1 %d", i);
-
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5: buf[6] = 5; break;
@@ -405,9 +398,6 @@
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0xc0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 4);
/* Setup termios */
if (port->tty) {
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