On 08/19/2014 12:58 PM, Peter Chen wrote:
My environment is Freescale i.MX6SL EVK board (as USB peripheral device),
which is based on kernel 3.10.17. i.MX6SL uses ChipIdea dual-role
controller.
My problem is that gadget drivers g_ether and g_audio (UAC1 enabled) can
NOT be detected by Windows 7 natively, while g_mass_storage, g_serial,
g_hid can be detected by Windows 7 natively.
1) I found that both Ether and USB Audio uses .bAlternateSetting, while
Mass Storage, Serial and HID do NOT. I am wondering if this is related to
how Gadget framework handles USB_REQ_SET_INTERFACE request?
If possible, would you use Linux PC or Mac OS (macbook pro+) to test?
>From my previous experiences, g_audio works not well with windows.
Thanks Peter. g_audio is now working with Ubuntu and MacOS host, but can
NOT get detected by Windows 7.
I am not sure if this Windows 7 detection issue is not specific to
g_audio (UAC1), because Windows can NOT natively detect g_ether (even
with RNDIS CONFIG_USB_ETH_RNDIS=y enabled).
Also, in file f_rndis.c, it says "/* Some controllers can't support
RNDIS ... */", I am not sure what does this mean. Does it mean possibly
controller like ChipIdea does NOT support RNDIS?
2) Also, I am not sure if it is related to ChipIdea quirk
(gadget_supports_altsettings in file gadget_chips.h)?
I can't find chipidea quirk at gadget_chips.h, besides, altsettings
are software stuff.
Peter
--
Thanks,
Xuebing Wang
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