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Hi All, I’m new to this list
and this my first query to group. I'm facing two problems
regarding USB device power ON/OFF, which are mentioned below: Case 1: I'm using RHEL4 with
usbserial driver for my application and here I'm facing problem while doing
power ON/OFF problem. It works fine up to 10 times after that I'm getting
problem in usb_dump_endpoint_descriptor. Since power ON/OFF is very
essential for our application so we wanted to run it for some 100 times, its
working fine up to 10 times, after that device is not able to detected by the
driver. In this case close function
is used as give below: static void
serial_close(struct tty_struct *tty, struct file * filp) { struct
usb_serial_port *port = (struct usb_serial_port *) tty->driver_data; if (!port) return; dbg("%s - port
%d", __FUNCTION__, port->number);
--port->open_count; if
(port->open_count <= 0){ /* only call
the device specific close if this * port is
being closed by the last owner */
port->serial->type->close(port, filp);
port->open_count = 0; if
(port->tty) { if
(port->tty->driver_data)
port->tty->driver_data = NULL;
port->tty = NULL; } }
//module_put(port->serial->type->owner);
//kref_put(&port->serial->kref, destroy_serial); } Case 2: One more problem I faced is
if I give AT+CFUN=0 from kermit, it does the same kind of work like it
disconnects the device, but it does not detect the device again. Close function is used as
given below; static void
serial_close(struct tty_struct *tty, struct file * filp) { struct
usb_serial_port *port = (struct usb_serial_port *) tty->driver_data; if (!port) return; dbg("%s - port
%d", __FUNCTION__, port->number);
--port->open_count; if
(port->open_count <= 0) { /* only call
the device specific close if this * port is
being closed by the last owner */
port->serial->type->close(port, filp);
port->open_count = 0; if
(port->tty) { if
(port->tty->driver_data)
port->tty->driver_data = NULL;
port->tty = NULL; } }
module_put(port->serial->type->owner);
kref_put(&port->serial->kref, destroy_serial); } Please give me suggestions
on this ASAP. Thanks & Regards, Shalini From: redhat-devel-list-bounces@xxxxxxxxxx
[mailto:redhat-devel-list-bounces@xxxxxxxxxx] On
Behalf Of Ankur Chaudhary hi, This Ankur Chaudhary, Cananybody plz tell what topic actually goingon. Have a nice day! Yahoo! for Good |
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