Hans Petter Selasky wrote:
On Monday 12 May 2008, Steve Clark wrote:
Hello List,
I have spent the afternoon going thru the usb code trying to figure out how
to do a read on the control port (endpoint 80 ? ) instead of a write (
endpoint 0 ). I am still trying to emulate what the linux sierra.c usb
serial driver does.
Any pointers would be greatly appreciated.
Thanks,
Steve
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Hi,
All transactions on the control endpoint (0) consist of three parts:
SETUP
DATA, if any
STATUS
The two most common variants are:
1) SETUP
DATA OUT
STATUS IN
2) SETUP
DATA IN
STATUS OUT
Rules:
The MSB of the first byte in the SETUP decides wheter the data is OUT (0x00)
or IN (0x80). IN and OUT is relative to the USB Host.
See: usbd_do_request and /sys/dev/usb/usb.h
typedef struct {
uByte bmRequestType;
uByte bRequest;
uWord wValue;
uWord wIndex;
uWord wLength;
uByte bData[0];
} __packed usb_device_request_t;
#define UT_WRITE 0x00
#define UT_READ 0x80
#define UT_STANDARD 0x00
#define UT_CLASS 0x20
#define UT_VENDOR 0x40
#define UT_DEVICE 0x00
#define UT_INTERFACE 0x01
#define UT_ENDPOINT 0x02
#define UT_OTHER 0x03
--HPS
Hi Hans,
I have decided to try your new usb stack. I am running on FreeBSD 6.1. The
device I am trying to get
working is a sierra wireless usb 597 EVDO modem. It is also has a slot for a
micro-sd memory card, plus
when it is first powered up it doesn't look like a modem it looks like a different device that has both the
umass device plus a cdrom device that has windows software drivers on it. In this mode it has a VID of 0x1199 and
a PID of 0xfff, after a message on the control pipe it changes its identity to
VID = 0x1199, PID=0x0023.
What I had done previously with the original 6.1 usba.c was in the match code
look for the 1199:fff and then
in the attach code send a message on the control pipe to set it in modem mode
like the code below:
{
ubsa_cfg_request( sc, 0x0b, 1);
ucom->sc_dying = 1;
goto error;
}
I tried to do something similar in the usba.c that is part of your new code as
follows:
{
ubsa_cfg_request( sc, 0x0b, 1);
goto detach;
}
but I immediately get a panic:
Fatal trap 12 page fault in kernel mode
...
Stopped at usbd_config_td_is_gone
bt gives:
ucom_cfg_is_gone
ubsa_cfg_request
ubsa_attach
...
Which looks like it doesn't like the device disappearing when it switched modes.
Any ideas how this should be handled? Or where I should be trying to switch the
device into modem mode?
Thanks,
Steve
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