2005-04-17 06:20:36 +08:00
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/*
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* USB Serial Converter Generic functions
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*
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2011-11-07 02:06:37 +08:00
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* Copyright (C) 2010 - 2011 Johan Hovold (jhovold@gmail.com)
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2005-04-17 06:20:36 +08:00
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* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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2010-03-26 02:29:16 +08:00
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#include <linux/sysrq.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/usb.h>
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2006-07-12 12:22:58 +08:00
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#include <linux/usb/serial.h>
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2008-07-22 18:11:55 +08:00
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#include <linux/uaccess.h>
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2009-08-29 03:54:27 +08:00
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#include <linux/kfifo.h>
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2010-02-17 23:05:47 +08:00
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#include <linux/serial.h>
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2006-12-18 04:50:24 +08:00
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2005-04-17 06:20:36 +08:00
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static int debug;
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#ifdef CONFIG_USB_SERIAL_GENERIC
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2007-03-24 03:51:55 +08:00
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2005-04-17 06:20:36 +08:00
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static __u16 vendor = 0x05f9;
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static __u16 product = 0xffff;
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module_param(vendor, ushort, 0);
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MODULE_PARM_DESC(vendor, "User specified USB idVendor");
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module_param(product, ushort, 0);
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MODULE_PARM_DESC(product, "User specified USB idProduct");
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static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
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/* All of the device info needed for the Generic Serial Converter */
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2005-06-21 12:15:16 +08:00
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struct usb_serial_driver usb_serial_generic_device = {
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2005-06-21 12:15:16 +08:00
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.driver = {
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.owner = THIS_MODULE,
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2005-06-21 12:15:16 +08:00
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.name = "generic",
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2005-06-21 12:15:16 +08:00
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},
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2005-04-17 06:20:36 +08:00
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.id_table = generic_device_ids,
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.num_ports = 1,
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2009-06-02 23:53:55 +08:00
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.disconnect = usb_serial_generic_disconnect,
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.release = usb_serial_generic_release,
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2007-02-02 03:08:18 +08:00
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.throttle = usb_serial_generic_throttle,
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.unthrottle = usb_serial_generic_unthrottle,
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2007-04-28 02:54:57 +08:00
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.resume = usb_serial_generic_resume,
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2005-04-17 06:20:36 +08:00
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};
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2012-02-24 03:55:59 +08:00
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static struct usb_serial_driver * const serial_drivers[] = {
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&usb_serial_generic_device, NULL
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};
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2005-04-17 06:20:36 +08:00
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#endif
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2008-07-22 18:11:55 +08:00
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int usb_serial_generic_register(int _debug)
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2005-04-17 06:20:36 +08:00
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{
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int retval = 0;
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debug = _debug;
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#ifdef CONFIG_USB_SERIAL_GENERIC
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generic_device_ids[0].idVendor = vendor;
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generic_device_ids[0].idProduct = product;
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2008-07-22 18:11:55 +08:00
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generic_device_ids[0].match_flags =
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USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
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2005-04-17 06:20:36 +08:00
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/* register our generic driver with ourselves */
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2012-06-01 05:03:52 +08:00
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retval = usb_serial_register_drivers(serial_drivers,
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"usbserial_generic", generic_device_ids);
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2005-04-17 06:20:36 +08:00
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#endif
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return retval;
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}
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2008-07-22 18:11:55 +08:00
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void usb_serial_generic_deregister(void)
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2005-04-17 06:20:36 +08:00
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{
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#ifdef CONFIG_USB_SERIAL_GENERIC
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/* remove our generic driver */
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2012-05-09 06:46:14 +08:00
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usb_serial_deregister_drivers(serial_drivers);
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2005-04-17 06:20:36 +08:00
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#endif
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}
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2009-09-20 04:13:26 +08:00
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int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port)
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2005-04-17 06:20:36 +08:00
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{
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int result = 0;
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2007-02-02 03:08:18 +08:00
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unsigned long flags;
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2005-04-17 06:20:36 +08:00
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2007-02-02 03:08:18 +08:00
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/* clear the throttle flags */
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spin_lock_irqsave(&port->lock, flags);
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port->throttled = 0;
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port->throttle_req = 0;
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spin_unlock_irqrestore(&port->lock, flags);
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/* if we have a bulk endpoint, start reading from it */
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2010-03-18 06:05:53 +08:00
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if (port->bulk_in_size)
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2011-11-07 02:06:37 +08:00
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result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
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2005-04-17 06:20:36 +08:00
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return result;
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}
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2006-05-13 02:05:29 +08:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_open);
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2005-04-17 06:20:36 +08:00
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2008-07-22 18:09:07 +08:00
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static void generic_cleanup(struct usb_serial_port *port)
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2005-04-17 06:20:36 +08:00
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{
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struct usb_serial *serial = port->serial;
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2010-03-18 06:00:44 +08:00
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unsigned long flags;
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2010-05-06 05:57:37 +08:00
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int i;
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2005-04-17 06:20:36 +08:00
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if (serial->dev) {
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2010-02-27 23:24:49 +08:00
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/* shutdown any bulk transfers that might be going on */
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2010-03-18 06:00:44 +08:00
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if (port->bulk_out_size) {
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2010-05-06 05:57:37 +08:00
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for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
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usb_kill_urb(port->write_urbs[i]);
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2010-03-18 06:00:44 +08:00
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spin_lock_irqsave(&port->lock, flags);
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kfifo_reset_out(&port->write_fifo);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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2011-11-07 02:06:37 +08:00
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if (port->bulk_in_size) {
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for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
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usb_kill_urb(port->read_urbs[i]);
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}
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2005-04-17 06:20:36 +08:00
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}
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}
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2009-06-11 19:26:29 +08:00
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void usb_serial_generic_close(struct usb_serial_port *port)
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2005-04-17 06:20:36 +08:00
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{
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2008-07-22 18:11:55 +08:00
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generic_cleanup(port);
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2005-04-17 06:20:36 +08:00
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}
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2010-03-18 06:00:45 +08:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_close);
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2005-04-17 06:20:36 +08:00
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2010-03-18 06:06:08 +08:00
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int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
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2010-05-06 05:58:13 +08:00
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void *dest, size_t size)
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2010-03-18 06:06:08 +08:00
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{
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2010-05-06 05:58:13 +08:00
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return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock);
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2009-05-12 04:24:07 +08:00
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}
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2009-08-29 03:54:27 +08:00
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/**
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* usb_serial_generic_write_start - kick off an URB write
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* @port: Pointer to the &struct usb_serial_port data
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*
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2010-05-06 05:57:37 +08:00
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* Returns zero on success, or a negative errno value
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2009-08-29 03:54:27 +08:00
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*/
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static int usb_serial_generic_write_start(struct usb_serial_port *port)
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{
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2010-05-06 05:57:37 +08:00
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struct urb *urb;
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int count, result;
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2009-08-29 03:54:27 +08:00
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unsigned long flags;
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2010-05-06 05:57:37 +08:00
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int i;
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2009-08-29 03:54:27 +08:00
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2010-05-06 05:57:37 +08:00
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if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags))
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return 0;
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retry:
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2009-08-29 03:54:27 +08:00
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spin_lock_irqsave(&port->lock, flags);
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2010-05-06 05:57:37 +08:00
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if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) {
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clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
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2010-03-18 06:06:02 +08:00
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spin_unlock_irqrestore(&port->lock, flags);
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return 0;
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2009-08-29 03:54:27 +08:00
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}
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2010-05-06 05:57:37 +08:00
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i = (int)find_first_bit(&port->write_urbs_free,
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ARRAY_SIZE(port->write_urbs));
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2009-08-29 03:54:27 +08:00
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spin_unlock_irqrestore(&port->lock, flags);
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2010-05-06 05:57:37 +08:00
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urb = port->write_urbs[i];
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2010-03-18 06:06:08 +08:00
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count = port->serial->type->prepare_write_buffer(port,
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2010-05-06 05:58:13 +08:00
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urb->transfer_buffer,
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port->bulk_out_size);
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2010-05-06 05:57:37 +08:00
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urb->transfer_buffer_length = count;
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usb_serial_debug_data(debug, &port->dev, __func__, count,
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urb->transfer_buffer);
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2010-08-04 21:45:57 +08:00
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spin_lock_irqsave(&port->lock, flags);
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port->tx_bytes += count;
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spin_unlock_irqrestore(&port->lock, flags);
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clear_bit(i, &port->write_urbs_free);
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2010-05-06 05:57:37 +08:00
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result = usb_submit_urb(urb, GFP_ATOMIC);
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2009-08-29 03:54:27 +08:00
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if (result) {
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2012-02-10 20:20:50 +08:00
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dev_err_console(port, "%s - error submitting urb: %d\n",
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2009-08-29 03:54:27 +08:00
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__func__, result);
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2010-08-04 21:45:57 +08:00
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set_bit(i, &port->write_urbs_free);
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spin_lock_irqsave(&port->lock, flags);
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port->tx_bytes -= count;
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spin_unlock_irqrestore(&port->lock, flags);
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2010-05-06 05:57:37 +08:00
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clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
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2010-03-18 06:00:42 +08:00
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return result;
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}
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2010-05-06 05:57:37 +08:00
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/* Try sending off another urb, unless in irq context (in which case
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* there will be no free urb). */
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if (!in_irq())
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goto retry;
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clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
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return 0;
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2009-08-29 03:54:27 +08:00
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}
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/**
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* usb_serial_generic_write - generic write function for serial USB devices
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* @tty: Pointer to &struct tty_struct for the device
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* @port: Pointer to the &usb_serial_port structure for the device
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* @buf: Pointer to the data to write
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* @count: Number of bytes to write
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*
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* Returns the number of characters actually written, which may be anything
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* from zero to @count. If an error occurs, it returns the negative errno
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* value.
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*/
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2008-07-22 18:09:07 +08:00
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int usb_serial_generic_write(struct tty_struct *tty,
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struct usb_serial_port *port, const unsigned char *buf, int count)
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2005-04-17 06:20:36 +08:00
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{
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int result;
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2010-02-27 23:24:49 +08:00
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/* only do something if we have a bulk out endpoint */
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if (!port->bulk_out_size)
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return -ENODEV;
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2010-03-18 06:06:01 +08:00
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if (!count)
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2008-07-22 18:11:55 +08:00
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return 0;
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2005-04-17 06:20:36 +08:00
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2009-12-23 16:10:48 +08:00
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count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
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2009-08-29 03:54:27 +08:00
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result = usb_serial_generic_write_start(port);
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2010-05-06 05:58:13 +08:00
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if (result)
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return result;
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2005-04-17 06:20:36 +08:00
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2010-05-06 05:58:13 +08:00
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return count;
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2005-04-17 06:20:36 +08:00
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}
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2009-05-12 04:24:09 +08:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_write);
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2005-04-17 06:20:36 +08:00
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2008-07-22 18:11:55 +08:00
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int usb_serial_generic_write_room(struct tty_struct *tty)
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2005-04-17 06:20:36 +08:00
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{
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2008-07-22 18:09:07 +08:00
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struct usb_serial_port *port = tty->driver_data;
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2009-05-12 04:24:07 +08:00
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unsigned long flags;
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2010-03-18 06:06:07 +08:00
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int room;
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2005-04-17 06:20:36 +08:00
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2010-02-27 23:24:49 +08:00
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if (!port->bulk_out_size)
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return 0;
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2009-05-12 04:24:07 +08:00
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spin_lock_irqsave(&port->lock, flags);
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2010-05-06 05:58:13 +08:00
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room = kfifo_avail(&port->write_fifo);
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2009-05-12 04:24:07 +08:00
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spin_unlock_irqrestore(&port->lock, flags);
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2005-04-17 06:20:36 +08:00
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2012-05-16 07:27:18 +08:00
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dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
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2008-04-09 00:16:06 +08:00
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return room;
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2005-04-17 06:20:36 +08:00
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}
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2008-07-22 18:09:07 +08:00
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int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
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2005-04-17 06:20:36 +08:00
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{
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2008-07-22 18:09:07 +08:00
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struct usb_serial_port *port = tty->driver_data;
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2009-05-12 04:24:07 +08:00
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unsigned long flags;
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2010-02-27 23:24:49 +08:00
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int chars;
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2005-04-17 06:20:36 +08:00
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2010-02-27 23:24:49 +08:00
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if (!port->bulk_out_size)
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return 0;
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2010-01-05 21:30:31 +08:00
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spin_lock_irqsave(&port->lock, flags);
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2010-05-06 05:58:13 +08:00
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chars = kfifo_len(&port->write_fifo) + port->tx_bytes;
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2010-01-05 21:30:31 +08:00
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spin_unlock_irqrestore(&port->lock, flags);
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2005-04-17 06:20:36 +08:00
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2012-05-16 07:27:18 +08:00
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dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
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2008-07-22 18:09:07 +08:00
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return chars;
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2005-04-17 06:20:36 +08:00
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}
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|
2011-11-07 02:06:37 +08:00
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static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
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int index, gfp_t mem_flags)
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{
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int res;
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if (!test_and_clear_bit(index, &port->read_urbs_free))
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|
|
|
return 0;
|
|
|
|
|
2012-05-16 07:27:18 +08:00
|
|
|
dev_dbg(&port->dev, "%s - port %d, urb %d\n", __func__,
|
|
|
|
port->number, index);
|
2011-11-07 02:06:37 +08:00
|
|
|
|
|
|
|
res = usb_submit_urb(port->read_urbs[index], mem_flags);
|
|
|
|
if (res) {
|
|
|
|
if (res != -EPERM) {
|
|
|
|
dev_err(&port->dev,
|
|
|
|
"%s - usb_submit_urb failed: %d\n",
|
|
|
|
__func__, res);
|
|
|
|
}
|
|
|
|
set_bit(index, &port->read_urbs_free);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
|
2010-03-18 06:05:53 +08:00
|
|
|
gfp_t mem_flags)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2011-11-07 02:06:37 +08:00
|
|
|
int res;
|
|
|
|
int i;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2011-11-07 02:06:37 +08:00
|
|
|
for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
|
|
|
|
res = usb_serial_generic_submit_read_urb(port, i, mem_flags);
|
|
|
|
if (res)
|
|
|
|
goto err;
|
2010-02-27 21:05:46 +08:00
|
|
|
}
|
2011-11-07 02:06:37 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
err:
|
|
|
|
for (; i >= 0; --i)
|
|
|
|
usb_kill_urb(port->read_urbs[i]);
|
|
|
|
|
|
|
|
return res;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2011-11-07 02:06:37 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2010-03-18 06:05:57 +08:00
|
|
|
void usb_serial_generic_process_read_urb(struct urb *urb)
|
2007-05-07 18:09:33 +08:00
|
|
|
{
|
2010-03-18 06:05:56 +08:00
|
|
|
struct usb_serial_port *port = urb->context;
|
|
|
|
struct tty_struct *tty;
|
2009-05-12 04:24:09 +08:00
|
|
|
char *ch = (char *)urb->transfer_buffer;
|
|
|
|
int i;
|
|
|
|
|
2010-05-15 23:53:44 +08:00
|
|
|
if (!urb->actual_length)
|
|
|
|
return;
|
|
|
|
|
2010-03-18 06:05:56 +08:00
|
|
|
tty = tty_port_tty_get(&port->port);
|
2009-05-12 04:24:09 +08:00
|
|
|
if (!tty)
|
2010-03-18 06:05:56 +08:00
|
|
|
return;
|
2007-05-07 18:09:33 +08:00
|
|
|
|
2009-07-09 20:35:52 +08:00
|
|
|
/* The per character mucking around with sysrq path it too slow for
|
|
|
|
stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases
|
|
|
|
where the USB serial is not a console anyway */
|
2010-03-09 11:50:12 +08:00
|
|
|
if (!port->port.console || !port->sysrq)
|
2009-07-09 20:35:52 +08:00
|
|
|
tty_insert_flip_string(tty, ch, urb->actual_length);
|
|
|
|
else {
|
|
|
|
for (i = 0; i < urb->actual_length; i++, ch++) {
|
2010-08-18 12:15:47 +08:00
|
|
|
if (!usb_serial_handle_sysrq_char(port, *ch))
|
2009-07-09 20:35:52 +08:00
|
|
|
tty_insert_flip_char(tty, *ch, TTY_NORMAL);
|
|
|
|
}
|
2007-05-07 18:09:33 +08:00
|
|
|
}
|
2009-05-12 04:24:09 +08:00
|
|
|
tty_flip_buffer_push(tty);
|
2008-10-13 17:39:46 +08:00
|
|
|
tty_kref_put(tty);
|
2007-05-07 18:09:33 +08:00
|
|
|
}
|
2010-03-18 06:05:57 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb);
|
2007-05-07 18:09:33 +08:00
|
|
|
|
2008-07-22 18:09:07 +08:00
|
|
|
void usb_serial_generic_read_bulk_callback(struct urb *urb)
|
2007-02-02 03:08:18 +08:00
|
|
|
{
|
2008-02-24 18:41:47 +08:00
|
|
|
struct usb_serial_port *port = urb->context;
|
2007-02-02 03:08:18 +08:00
|
|
|
unsigned char *data = urb->transfer_buffer;
|
2007-10-28 20:24:16 +08:00
|
|
|
unsigned long flags;
|
2011-11-07 02:06:37 +08:00
|
|
|
int i;
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2011-11-07 02:06:37 +08:00
|
|
|
for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
|
|
|
|
if (urb == port->read_urbs[i])
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
set_bit(i, &port->read_urbs_free);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2012-05-16 07:27:18 +08:00
|
|
|
dev_dbg(&port->dev, "%s - port %d, urb %d, len %d\n",
|
|
|
|
__func__, port->number, i, urb->actual_length);
|
|
|
|
|
2011-11-07 02:06:37 +08:00
|
|
|
if (urb->status) {
|
2012-05-16 07:27:18 +08:00
|
|
|
dev_dbg(&port->dev, "%s - non-zero urb status: %d\n",
|
|
|
|
__func__, urb->status);
|
2007-02-02 03:08:18 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-07-22 18:11:55 +08:00
|
|
|
usb_serial_debug_data(debug, &port->dev, __func__,
|
|
|
|
urb->actual_length, data);
|
2010-03-18 06:05:57 +08:00
|
|
|
port->serial->type->process_read_urb(urb);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
|
|
|
/* Throttle the device if requested by tty */
|
2007-10-28 20:24:16 +08:00
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
2008-07-22 18:11:55 +08:00
|
|
|
port->throttled = port->throttle_req;
|
|
|
|
if (!port->throttled) {
|
2008-03-05 15:28:42 +08:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
2011-11-07 02:06:37 +08:00
|
|
|
usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC);
|
2008-07-22 18:11:55 +08:00
|
|
|
} else
|
2008-03-05 15:28:42 +08:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
2007-02-02 03:08:18 +08:00
|
|
|
}
|
2006-07-12 01:19:25 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-22 18:09:07 +08:00
|
|
|
void usb_serial_generic_write_bulk_callback(struct urb *urb)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2009-05-12 04:24:07 +08:00
|
|
|
unsigned long flags;
|
2008-02-24 18:41:47 +08:00
|
|
|
struct usb_serial_port *port = urb->context;
|
2007-06-16 06:44:13 +08:00
|
|
|
int status = urb->status;
|
2010-05-06 05:57:37 +08:00
|
|
|
int i;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-05-06 05:58:13 +08:00
|
|
|
for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
|
|
|
|
if (port->write_urbs[i] == urb)
|
|
|
|
break;
|
2010-01-07 07:48:42 +08:00
|
|
|
|
2010-05-06 05:58:13 +08:00
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
port->tx_bytes -= urb->transfer_buffer_length;
|
|
|
|
set_bit(i, &port->write_urbs_free);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
if (status) {
|
2012-05-16 07:27:18 +08:00
|
|
|
dev_dbg(&port->dev, "%s - non-zero urb status: %d\n",
|
|
|
|
__func__, status);
|
2010-05-06 05:57:37 +08:00
|
|
|
|
2010-03-18 06:00:42 +08:00
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
2010-05-06 05:58:13 +08:00
|
|
|
kfifo_reset_out(&port->write_fifo);
|
2010-03-18 06:00:42 +08:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
2010-05-06 05:58:13 +08:00
|
|
|
} else {
|
|
|
|
usb_serial_generic_write_start(port);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2009-08-29 03:54:27 +08:00
|
|
|
|
2006-05-23 12:58:49 +08:00
|
|
|
usb_serial_port_softint(port);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2005-11-18 01:48:18 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-22 18:09:07 +08:00
|
|
|
void usb_serial_generic_throttle(struct tty_struct *tty)
|
2007-02-02 03:08:18 +08:00
|
|
|
{
|
2008-07-22 18:09:07 +08:00
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
2007-02-02 03:08:18 +08:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
/* Set the throttle request flag. It will be picked up
|
|
|
|
* by usb_serial_generic_read_bulk_callback(). */
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
port->throttle_req = 1;
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
2010-03-18 06:05:59 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_throttle);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2008-07-22 18:09:07 +08:00
|
|
|
void usb_serial_generic_unthrottle(struct tty_struct *tty)
|
2007-02-02 03:08:18 +08:00
|
|
|
{
|
2008-07-22 18:09:07 +08:00
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
2007-02-02 03:08:18 +08:00
|
|
|
int was_throttled;
|
|
|
|
|
|
|
|
/* Clear the throttle flags */
|
2010-03-18 06:05:56 +08:00
|
|
|
spin_lock_irq(&port->lock);
|
2007-02-02 03:08:18 +08:00
|
|
|
was_throttled = port->throttled;
|
|
|
|
port->throttled = port->throttle_req = 0;
|
2010-03-18 06:05:56 +08:00
|
|
|
spin_unlock_irq(&port->lock);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2010-03-18 06:05:56 +08:00
|
|
|
if (was_throttled)
|
2011-11-07 02:06:37 +08:00
|
|
|
usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
|
2007-02-02 03:08:18 +08:00
|
|
|
}
|
2010-03-18 06:05:59 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2010-03-26 02:29:16 +08:00
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
2010-08-18 12:15:47 +08:00
|
|
|
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
|
2009-05-12 04:24:09 +08:00
|
|
|
{
|
2010-03-09 11:50:12 +08:00
|
|
|
if (port->sysrq && port->port.console) {
|
2009-05-12 04:24:09 +08:00
|
|
|
if (ch && time_before(jiffies, port->sysrq)) {
|
2010-08-18 12:15:47 +08:00
|
|
|
handle_sysrq(ch);
|
2009-05-12 04:24:09 +08:00
|
|
|
port->sysrq = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
port->sysrq = 0;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2010-03-26 02:29:16 +08:00
|
|
|
#else
|
2010-08-18 12:15:47 +08:00
|
|
|
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
|
2010-03-26 02:29:16 +08:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
2009-05-12 04:24:09 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
|
|
|
|
|
|
|
|
int usb_serial_handle_break(struct usb_serial_port *port)
|
|
|
|
{
|
|
|
|
if (!port->sysrq) {
|
|
|
|
port->sysrq = jiffies + HZ*5;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
port->sysrq = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_handle_break);
|
|
|
|
|
2011-01-14 21:30:21 +08:00
|
|
|
/**
|
|
|
|
* usb_serial_handle_dcd_change - handle a change of carrier detect state
|
|
|
|
* @port: usb_serial_port structure for the open port
|
|
|
|
* @tty: tty_struct structure for the port
|
|
|
|
* @status: new carrier detect status, nonzero if active
|
|
|
|
*/
|
|
|
|
void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
|
|
|
|
struct tty_struct *tty, unsigned int status)
|
|
|
|
{
|
|
|
|
struct tty_port *port = &usb_port->port;
|
|
|
|
|
2012-05-16 07:27:18 +08:00
|
|
|
dev_dbg(&usb_port->dev, "%s - port %d, status %d\n", __func__,
|
|
|
|
usb_port->number, status);
|
2011-01-14 21:30:21 +08:00
|
|
|
|
|
|
|
if (status)
|
|
|
|
wake_up_interruptible(&port->open_wait);
|
|
|
|
else if (tty && !C_CLOCAL(tty))
|
|
|
|
tty_hangup(tty);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change);
|
|
|
|
|
2009-08-29 03:54:27 +08:00
|
|
|
int usb_serial_generic_resume(struct usb_serial *serial)
|
|
|
|
{
|
|
|
|
struct usb_serial_port *port;
|
|
|
|
int i, c = 0, r;
|
|
|
|
|
|
|
|
for (i = 0; i < serial->num_ports; i++) {
|
|
|
|
port = serial->port[i];
|
2010-02-17 23:05:47 +08:00
|
|
|
if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
|
2009-08-29 03:54:27 +08:00
|
|
|
continue;
|
|
|
|
|
2011-11-07 02:06:37 +08:00
|
|
|
if (port->bulk_in_size) {
|
|
|
|
r = usb_serial_generic_submit_read_urbs(port,
|
|
|
|
GFP_NOIO);
|
2009-08-29 03:54:27 +08:00
|
|
|
if (r < 0)
|
|
|
|
c++;
|
|
|
|
}
|
|
|
|
|
2010-05-06 05:57:37 +08:00
|
|
|
if (port->bulk_out_size) {
|
2009-08-29 03:54:27 +08:00
|
|
|
r = usb_serial_generic_write_start(port);
|
|
|
|
if (r < 0)
|
|
|
|
c++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return c ? -EIO : 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_resume);
|
|
|
|
|
2009-06-02 23:53:55 +08:00
|
|
|
void usb_serial_generic_disconnect(struct usb_serial *serial)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* stop reads and writes on all ports */
|
2008-07-22 18:11:55 +08:00
|
|
|
for (i = 0; i < serial->num_ports; ++i)
|
2005-04-17 06:20:36 +08:00
|
|
|
generic_cleanup(serial->port[i]);
|
|
|
|
}
|
2010-08-06 05:01:10 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2009-06-02 23:53:55 +08:00
|
|
|
void usb_serial_generic_release(struct usb_serial *serial)
|
|
|
|
{
|
|
|
|
}
|