static void usb_console_write(struct console *co, const char *buf, unsigned count) { static struct usbcons_info *info = &usbcons_info; struct usb_serial_port *port = info->port; struct usb_serial *serial; int retval = -ENODEV; if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED) return; serial = port->serial; if (count == 0) return; dbg("%s - port %d, %d byte(s)", __func__, port->number, count); if (!port->port.console) { dbg("%s - port not opened", __func__); return; } while (count) { unsigned int i; unsigned int lf; /* search for LF so we can insert CR if necessary */ for (i = 0, lf = 0 ; i < count ; i++) { if (*(buf + i) == 10) { lf = 1; i++; break; } } /* pass on to the driver specific version of this function if it is available */ if (serial->type->write) retval = serial->type->write(NULL, port, buf, i); else retval = usb_serial_generic_write(NULL, port, buf, i); dbg("%s - return value : %d", __func__, retval); if (lf) { /* append CR after LF */ unsigned char cr = 13; if (serial->type->write) retval = serial->type->write(NULL, port, &cr, 1); else retval = usb_serial_generic_write(NULL, port, &cr, 1); dbg("%s - return value : %d", __func__, retval); } buf += i; count -= i; } }
/* This HW really does not support a serial break, so one will be * emulated when ever the break state is set to true. */ static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; if (!break_state) return; usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); }