Differences: speedtouch 330 vs the older speedtouch USB:
Vendor and ProdID: no difference (!)
Rev: 2.00 vs 0.00
SerialNumber: 0090D0xxxxxx, xxxxxx larger for 330
Interface 1, Alt 2:
E: Ad=06(O) Atr=02(Bulk) MxPS=64 Ivl=0ms
E: Ad=07(O) Atr=02(Bulk) MxPS=64 Ivl=0ms
E: Ad=87(I) Atr=01(Isoc) MxPS=640 Ivl=1ms
vs
E: Ad=06(O) Atr=02(Bulk) MxPS=32 Ivl=0ms
E: Ad=07(O) Atr=02(Bulk) MxPS=32 Ivl=0ms
E: Ad=87(I) Atr=02(Bulk) MxPS=64 Ivl=0ms
Interface 1, Alt 3:
E: Ad=06(O) Atr=02(Bulk) MxPS=64 Ivl=0ms
E: Ad=07(O) Atr=02(Bulk) MxPS=64 Ivl=0ms
E: Ad=87(I) Atr=01(Isoc) MxPS=960 Ivl=1ms
vs
E: Ad=06(O) Atr=02(Bulk) MxPS=16 Ivl=0ms
E: Ad=07(O) Atr=02(Bulk) MxPS=16 Ivl=0ms
E: Ad=87(I) Atr=02(Bulk) MxPS=64 Ivl=0ms
The current driver works with the speedtouch 330 as long as we use alternate setting
1 on interface 1 rather than alternate 2 as we do now. In fact it makes sense to use
alternate 1 for the speedtouch USB as well: the difference is in the max packet size
for the out bulk endpoint (0x07): 64 for Alt 1, 32 for Alt 2. Since we send only
multiples of 53 bytes (ATM cell size), the potential lower latency for Alt 2 is not
really exploitable (think about it!). My tests indicate no harm and perhaps a slight
gain by using Alt 1. The manufacturer seems to think so too, since they chose to
keep the Alt 1 setting and threw out Alt 2 when designing the 330. So just use Alt 1
for both modems.
speedtouch.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -Nru a/drivers/usb/misc/speedtouch.c b/drivers/usb/misc/speedtouch.c
--- a/drivers/usb/misc/speedtouch.c Sun Feb 9 21:00:07 2003
+++ b/drivers/usb/misc/speedtouch.c Sun Feb 9 21:00:08 2003
@@ -859,7 +859,7 @@
instance->atm_dev->signal = ATM_PHY_SIG_FOUND;
down (&instance->serialize); /* vs self */
if (!instance->firmware_loaded) {
- usb_set_interface (instance->usb_dev, 1, 2);
+ usb_set_interface (instance->usb_dev, 1, 1);
instance->firmware_loaded = 1;
}
up (&instance->serialize);
-------------------------------------------------------
This SF.NET email is sponsored by:
SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See!
http://www.vasoftware.com
_______________________________________________
[EMAIL PROTECTED]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
