Hello...
I'm using the Moschip USB-serial driver code available here:
http://www.moschip.com/html/MCS7840.html I have verified that it works
with the 2.6.11-1.1369_FC4 kernel in Fedora Core 4.
I am, however, wanting to use it with the latest 2.6.17-1.2157_FC5 in
Fedora Core 5. I've made minor updates to their driver so that it will
compile and load with the newer kernel. i.e. Changed 'struct
usb_serial_device_type' to 'struct usb_serial_driver' and minor tty flip
buffer changes.
But I am experiencing issues in code that I have not changed and am
looking for clues as to why it would not work in the latest Fedora
kernel version. A call to usb_control_msg seems to be returning a
negative error status where it didn't before. It worked just fine with
the earlier kernel version, but it seems to be returning -EPIPE now.
The code below is being called from the driver's
usb_serial_driver.attach function..
mos7840_get_reg_sync works fine. The error occurs in the call to
mos7840_set_reg_sync. Doesn't seem to be anything fancy going on here,
so I'm wondering if there is simply some sort of setup or config that
need/could be done?? If anybody has any tips, it would be appreciated..
Thanks...Paul...
-------------------------------------------------------------
//enable rx_disable bit in control register
status=mos7840_get_reg_sync(serial->port[i],mos7840_port->ControlRegOffset,&Data);
if(status<0) {
DPRINTK("Reading ControlReg failed status-0x%x\n", status);
break;
}
else DPRINTK("ControlReg Reading success val is %x,
status%d\n",Data,status);
Data |= 0x08;//setting driver done bit
Data |= 0x04;//sp1_bit to have cts change reflect in modem status reg
//Data |= 0x20; //rx_disable bit
status=0;
status=mos7840_set_reg_sync(serial->port[i],mos7840_port->ControlRegOffset,Data);
if(status<0) {
DPRINTK("Writing ControlReg failed(rx_disable) status-0x%x\n",
status);
break;
}
else DPRINTK("ControlReg Writing success(rx_disable) status%d\n",status);
----------------------------------------------------------------
/*
Description:- To set the Control register by calling
usb_fill_control_urb function by passing usb_sndctrlpipe function as
parameter.
Input Parameters:
usb_serial_port: Data Structure usb_serialport correponding to that
seril port.Reg: Register Address
Val: Value to set in the Register.
*/
static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
DPRINTK("mos7840_set_reg_sync offset is %x, value %x\n",reg,val);
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, val, reg, NULL, 0,MOS_WDR_TIMEOUT);
}
/*
Description:- To set the Uart register by calling usb_fill_control_urb
function by passing usb_rcvctrlpipe function as parameter.
Input Parameters:
usb_serial_port: Data Structure usb_serialport correponding to that
seril port.Reg: Register Address
Val: Value to receive from the Register.
*/
static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 * val)
{
struct usb_device *dev = port->serial->dev;
int ret=0;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, 0, reg, val,
VENDOR_READ_LENGTH,MOS_WDR_TIMEOUT);
DPRINTK("mos7840_get_reg_sync offset is %x, return val
%x\n",reg,*val);
return ret;
}
--
---
Paul B Schroeder <pschroeder "at" uplogix "dot" com>
Senior Software Engineer
Uplogix, Inc. (http://www.uplogix.com/)
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