I ran into the same issue a while back. I started to make a patch to
drivers/usb/gadget/f_acm.c to fix it, but got sidetracked. The
ordering workaround does not help when you have more than one ACM in
your config. Fortunately for me, I am using the ACMs for raw serial,
and not as modems, and I don't seem to be having any issues caused by
the incorrect descriptors.
On Apr 15, 2:30 am, Hung Squall <squall.h...@gmail.com> wrote:
> Hi Jagan,
>
> This is my case, acm If# is not mapped to interface desc given from device.
> So I put "acm" to first order then the acm interface can be located at first
> one (If# = 0) on desktop side.
>
> Desktop side
> cat /sys/kernel/debug/usb/devices
> S: Product=Android HSUSB Device
> S: SerialNumber=1234567890ABCDEF
> C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA
> A: FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=02 Prot=01
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=cdc_acm
> E: Ad=82(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
> I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_acm
> E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 2 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
> E: Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=125us
> I:* If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
> E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=usbfs
> E: Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
>
> Device side,
> static char *usb_functions_all[] = {
> #ifdef CONFIG_USB_ANDROID_ACM
> "acm",
> #endif
> #ifdef CONFIG_USB_ANDROID_RNDIS
> "rndis",
> #endif
> "usb_mass_storage",
> #ifdef CONFIG_USB_ANDROID_DIAG
> "diag",
> #endif
> "adb",
> #ifdef CONFIG_USB_F_SERIAL
> "modem",
> "nmea",
> #endif
> #ifdef CONFIG_USB_ANDROID_RMNET
> "rmnet",
> #endif
>
> };
>
> br,
> Chihchia
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