Thanks David.
All working now.
Can we get the Kconfig text fixed too since it's definetly confusing.
Try submitting a patch with text that's less confusing to you. Any more technical details probably belong in Documentation/usb.
We expect that 2.6.1 will make such confusion less of an issue, but a fix to get rid of the confusion would help.
- Dave
much appreciated. Mitch
-------- Original Message --------
Subject: Re: [linux-usb-devel] acm modem not working in 2.6-test11 but works in 2.4
Date: Sun, 30 Nov 2003 09:12:12 -0800
From: David Brownell <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
References: <[EMAIL PROTECTED]>
[EMAIL PROTECTED] wrote:
If your modem only reports "Cls=ff(vend.)" in the descriptors in /proc/bus/usb/devices, then your modem will not work with this driver.
which mine does (see below), i can't understand why this works
in 2.4 and not 2.6 kernels ?
Because that Kconfig help text is wrong. The issue is that if the modem ONLY reports vendor-specific (likely MSFT-proprietary) configurations, you're in trouble. But since your modem has two configurations ("#Cfgs= 2)", and the second one is normal, you just need to make Linux use that configuration.
The simple way: "echo 2 > /sys/bus/usb/devices/1-2/bConfigurationValue" and then the cdc-acm code will automatically hook up with that device. The "1-2" is the path from the root to your device, and won't change so long as you don't plug it into a different hub port. The "2" is from the config descriptor below: "C: ... Cfg# = 2..." has the standard "I: ... Cls=02(comm.) Sub=02 Prot=01..." interface.
And 2.6.1 should remove the need for this manual tweak, using a version of this patch
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=106642332707309&w=2
The only change being to give the right error message if the set_config fails; that version reports the wrong config value in some cases.
- Dave
p.s. MxPwr=400mA ... which is a lot, that likely needs a powered hub. Like the root hu you're using in this case.
Oh bootup i get:
drivers/usb/core/usb.c: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.21:USB Abstract Control Model driver for USB modems and ISDN adapters
My /proc/bus/usb/devices:
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 P: Vendor=05cc ProdID=2265 Rev= 1.00 S: Manufacturer=Lucent Technologies, Inc. S: Product=ELSA Modem Board C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=400mA I: If#= 0 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) I: If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) E: Ad=02(O) Atr=02(Bulk) MxPS= 16 Ivl=0ms E: Ad=84(I) Atr=03(Int.) MxPS= 63 Ivl=2ms C: #Ifs= 2 Cfg#= 2 Atr=a0 MxPwr=400mA I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=(none) E: Ad=84(I) Atr=03(Int.) MxPS= 32 Ivl=128ms I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=02 Prot=01 Driver=(none) E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=86(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
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