Re: usb hsdpa modem only detected after using it on windows

[Raja R Harinath <harinath@hurrynot.org>]

Hi,

Umarzuki Mochlis <umarzuki@gmail.com> writes:

> the modem is Huawei E1762 which is provided by local ISP when registering for their wireless broadband service.
>
> this modem, weirdly, can only be detected when i used it recently from windows xp, while the device still connected into the usb port, reboot into debian, then it will be
> detected and can be used with Vodafone Mobile Connect Card driver for Linux
>
> detected as usb storage
> Bus 005 Device 003: ID 12d1:1446 Huawei Technologies Co., Ltd.
>
> detected as modem
> Bus 005 Device 003: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E270 HSDPA/HSUPA Modem

This looks like an USB device that carries its Windows drivers on it.
When you first plug it in, it appears as a USB storage device with the
driver in it.  After the Windows driver is installed, it pokes the
device to make the modem interface appear.

Now, on Linux, the modem interface, 0x1003, is supported by the option.c
driver.  So, the trick is to add a quirk to the USB storage driver to
handle the poking.  It appears there already are similar devices, and
there already is code in the kernel to handle the poking of the device,
etc.

You'll probably need to patch the drivers/usb/storage/unusual_devs.h
file in the kernel to add a para that looks like:

  UNUSUAL_DEV(  0x12d1, 0x1446, 0x0000, 0x0000,
                "HUAWEI MOBILE",
                "Mass Storage",
                US_SC_DEVICE, US_PR_DEVICE, usb_stor_huawei_e220_init,
                0),

and recompile.  Unfortunately, the usbstorage 'quirk=...' option doesn't
appear to be able to handle this kind of quirk.

- Hari