2017-11-03 18:28:30 +08:00
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// SPDX-License-Identifier: GPL-2.0
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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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2013-03-21 19:37:51 +08:00
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* Copyright (C) 2010 - 2013 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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#include <linux/kernel.h>
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2017-02-03 02:15:33 +08:00
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#include <linux/sched/signal.h>
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2005-04-17 06:20:36 +08:00
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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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#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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2017-03-17 00:13:31 +08:00
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static int usb_serial_generic_probe(struct usb_serial *serial,
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const struct usb_device_id *id)
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{
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struct device *dev = &serial->interface->dev;
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dev_info(dev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
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dev_info(dev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
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return 0;
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}
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2017-03-17 00:13:32 +08:00
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static int usb_serial_generic_calc_num_ports(struct usb_serial *serial,
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struct usb_serial_endpoints *epds)
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{
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struct device *dev = &serial->interface->dev;
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2017-03-17 00:13:33 +08:00
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int num_ports;
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num_ports = max(epds->num_bulk_in, epds->num_bulk_out);
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2017-03-17 00:13:32 +08:00
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if (num_ports == 0) {
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2017-03-17 00:13:33 +08:00
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dev_err(dev, "device has no bulk endpoints\n");
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2017-03-17 00:13:32 +08:00
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return -ENODEV;
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}
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return num_ports;
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}
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static 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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2017-03-17 00:13:31 +08:00
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.probe = usb_serial_generic_probe,
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2017-03-17 00:13:32 +08:00
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.calc_num_ports = usb_serial_generic_calc_num_ports,
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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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2012-09-18 23:05:17 +08:00
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int usb_serial_generic_register(void)
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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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#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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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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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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2019-04-26 00:05:37 +08:00
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clear_bit(USB_SERIAL_THROTTLED, &port->flags);
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2007-02-02 03:08:18 +08:00
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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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2013-03-21 19:36:41 +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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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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2013-03-21 19:36:38 +08:00
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if (port->bulk_out_size) {
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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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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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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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2005-04-17 06:20:36 +08:00
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}
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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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2013-10-09 23:01:10 +08:00
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* usb_serial_generic_write_start - start writing buffered data
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* @port: usb-serial port
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2013-10-09 23:01:11 +08:00
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* @mem_flags: flags to use for memory allocations
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2013-10-09 23:01:10 +08:00
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*
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* Serialised using USB_SERIAL_WRITE_BUSY flag.
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2009-08-29 03:54:27 +08:00
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*
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2013-10-09 23:01:10 +08:00
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* Return: Zero on success or if busy, otherwise a negative errno value.
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2009-08-29 03:54:27 +08:00
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*/
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2013-10-09 23:01:12 +08:00
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int usb_serial_generic_write_start(struct usb_serial_port *port,
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2013-10-09 23:01:11 +08:00
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gfp_t mem_flags)
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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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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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2012-09-18 16:58:57 +08:00
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usb_serial_debug_data(&port->dev, __func__, count, 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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2013-10-09 23:01:11 +08:00
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result = usb_submit_urb(urb, mem_flags);
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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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2013-11-09 19:38:09 +08:00
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goto retry; /* try sending off another urb */
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2009-08-29 03:54:27 +08:00
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}
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2013-10-09 23:01:12 +08:00
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EXPORT_SYMBOL_GPL(usb_serial_generic_write_start);
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2009-08-29 03:54:27 +08:00
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/**
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2013-10-09 23:01:10 +08:00
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* usb_serial_generic_write - generic write function
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* @tty: tty for the port
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* @port: usb-serial port
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* @buf: data to write
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* @count: number of bytes to write
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2009-08-29 03:54:27 +08:00
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*
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2013-10-09 23:01:10 +08:00
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* Return: The number of characters buffered, which may be anything from
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* zero to @count, 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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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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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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2013-11-09 19:38:10 +08:00
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result = usb_serial_generic_write_start(port, GFP_ATOMIC);
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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;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2012-10-29 17:56:25 +08:00
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2013-05-08 23:51:43 +08:00
|
|
|
void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout)
|
|
|
|
{
|
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
unsigned int bps;
|
|
|
|
unsigned long period;
|
|
|
|
unsigned long expire;
|
|
|
|
|
|
|
|
bps = tty_get_baud_rate(tty);
|
|
|
|
if (!bps)
|
|
|
|
bps = 9600; /* B0 */
|
|
|
|
/*
|
|
|
|
* Use a poll-period of roughly the time it takes to send one
|
|
|
|
* character or at least one jiffy.
|
|
|
|
*/
|
|
|
|
period = max_t(unsigned long, (10 * HZ / bps), 1);
|
2015-03-04 17:39:05 +08:00
|
|
|
if (timeout)
|
|
|
|
period = min_t(unsigned long, period, timeout);
|
2013-05-08 23:51:43 +08:00
|
|
|
|
|
|
|
dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n",
|
|
|
|
__func__, jiffies_to_msecs(timeout),
|
|
|
|
jiffies_to_msecs(period));
|
|
|
|
expire = jiffies + timeout;
|
|
|
|
while (!port->serial->type->tx_empty(port)) {
|
|
|
|
schedule_timeout_interruptible(period);
|
|
|
|
if (signal_pending(current))
|
|
|
|
break;
|
2015-03-04 17:39:05 +08:00
|
|
|
if (timeout && time_after(jiffies, expire))
|
2013-05-08 23:51:43 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_wait_until_sent);
|
|
|
|
|
2011-11-07 02:06:37 +08:00
|
|
|
static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
|
|
|
|
int index, gfp_t mem_flags)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
|
|
|
|
if (!test_and_clear_bit(index, &port->read_urbs_free))
|
|
|
|
return 0;
|
|
|
|
|
2013-03-21 19:36:27 +08:00
|
|
|
dev_dbg(&port->dev, "%s - urb %d\n", __func__, index);
|
2011-11-07 02:06:37 +08:00
|
|
|
|
|
|
|
res = usb_submit_urb(port->read_urbs[index], mem_flags);
|
|
|
|
if (res) {
|
2015-01-11 21:42:07 +08:00
|
|
|
if (res != -EPERM && res != -ENODEV) {
|
2011-11-07 02:06:37 +08:00
|
|
|
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;
|
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;
|
2013-10-09 23:01:10 +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.
|
|
|
|
*/
|
2020-07-08 20:49:54 +08:00
|
|
|
if (port->sysrq) {
|
2009-07-09 20:35:52 +08:00
|
|
|
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))
|
2013-01-03 22:53:03 +08:00
|
|
|
tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
|
2009-07-09 20:35:52 +08:00
|
|
|
}
|
2020-07-08 20:49:54 +08:00
|
|
|
} else {
|
|
|
|
tty_insert_flip_string(&port->port, ch, urb->actual_length);
|
2007-05-07 18:09:33 +08:00
|
|
|
}
|
2013-01-03 22:53:06 +08:00
|
|
|
tty_flip_buffer_push(&port->port);
|
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;
|
2019-04-26 00:05:36 +08:00
|
|
|
bool stopped = false;
|
2016-07-14 21:01:40 +08:00
|
|
|
int status = urb->status;
|
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;
|
|
|
|
}
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2013-03-21 19:36:27 +08:00
|
|
|
dev_dbg(&port->dev, "%s - urb %d, len %d\n", __func__, i,
|
|
|
|
urb->actual_length);
|
2016-07-14 21:01:40 +08:00
|
|
|
switch (status) {
|
2014-03-13 02:09:39 +08:00
|
|
|
case 0:
|
2019-04-26 00:05:36 +08:00
|
|
|
usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
|
|
|
|
data);
|
|
|
|
port->serial->type->process_read_urb(urb);
|
2014-03-13 02:09:39 +08:00
|
|
|
break;
|
|
|
|
case -ENOENT:
|
|
|
|
case -ECONNRESET:
|
|
|
|
case -ESHUTDOWN:
|
|
|
|
dev_dbg(&port->dev, "%s - urb stopped: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2019-04-26 00:05:36 +08:00
|
|
|
stopped = true;
|
|
|
|
break;
|
2014-03-13 02:09:39 +08:00
|
|
|
case -EPIPE:
|
|
|
|
dev_err(&port->dev, "%s - urb stopped: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2019-04-26 00:05:36 +08:00
|
|
|
stopped = true;
|
|
|
|
break;
|
2014-03-13 02:09:39 +08:00
|
|
|
default:
|
2015-01-11 21:42:06 +08:00
|
|
|
dev_dbg(&port->dev, "%s - nonzero urb status: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2019-04-26 00:05:36 +08:00
|
|
|
break;
|
2007-02-02 03:08:18 +08:00
|
|
|
}
|
|
|
|
|
2019-04-26 00:05:36 +08:00
|
|
|
/*
|
|
|
|
* Make sure URB processing is done before marking as free to avoid
|
|
|
|
* racing with unthrottle() on another CPU. Matches the barriers
|
|
|
|
* implied by the test_and_clear_bit() in
|
|
|
|
* usb_serial_generic_submit_read_urb().
|
|
|
|
*/
|
|
|
|
smp_mb__before_atomic();
|
|
|
|
set_bit(i, &port->read_urbs_free);
|
|
|
|
/*
|
|
|
|
* Make sure URB is marked as free before checking the throttled flag
|
|
|
|
* to avoid racing with unthrottle() on another CPU. Matches the
|
2020-01-30 18:06:58 +08:00
|
|
|
* smp_mb__after_atomic() in unthrottle().
|
2019-04-26 00:05:36 +08:00
|
|
|
*/
|
|
|
|
smp_mb__after_atomic();
|
|
|
|
|
|
|
|
if (stopped)
|
|
|
|
return;
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2019-04-26 00:05:37 +08:00
|
|
|
if (test_bit(USB_SERIAL_THROTTLED, &port->flags))
|
|
|
|
return;
|
|
|
|
|
|
|
|
usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC);
|
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;
|
2016-07-14 21:01:40 +08:00
|
|
|
int status = urb->status;
|
2010-05-06 05:57:37 +08:00
|
|
|
int i;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2014-03-13 02:09:41 +08:00
|
|
|
for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
|
2010-05-06 05:58:13 +08:00
|
|
|
if (port->write_urbs[i] == urb)
|
|
|
|
break;
|
2014-03-13 02:09:41 +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);
|
|
|
|
|
2016-07-14 21:01:40 +08:00
|
|
|
switch (status) {
|
2014-03-13 02:09:40 +08:00
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case -ENOENT:
|
|
|
|
case -ECONNRESET:
|
|
|
|
case -ESHUTDOWN:
|
|
|
|
dev_dbg(&port->dev, "%s - urb stopped: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2014-03-13 02:09:40 +08:00
|
|
|
return;
|
|
|
|
case -EPIPE:
|
|
|
|
dev_err_console(port, "%s - urb stopped: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2014-03-13 02:09:40 +08:00
|
|
|
return;
|
|
|
|
default:
|
|
|
|
dev_err_console(port, "%s - nonzero urb status: %d\n",
|
2016-07-14 21:01:40 +08:00
|
|
|
__func__, status);
|
2019-04-26 00:05:38 +08:00
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2009-08-29 03:54:27 +08:00
|
|
|
|
2014-03-13 02:09:40 +08:00
|
|
|
usb_serial_generic_write_start(port, GFP_ATOMIC);
|
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
|
|
|
|
2019-04-26 00:05:37 +08:00
|
|
|
set_bit(USB_SERIAL_THROTTLED, &port->flags);
|
2007-02-02 03:08:18 +08:00
|
|
|
}
|
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
|
|
|
|
2019-04-26 00:05:37 +08:00
|
|
|
clear_bit(USB_SERIAL_THROTTLED, &port->flags);
|
2007-02-02 03:08:18 +08:00
|
|
|
|
2019-04-26 00:05:36 +08:00
|
|
|
/*
|
|
|
|
* Matches the smp_mb__after_atomic() in
|
|
|
|
* usb_serial_generic_read_bulk_callback().
|
|
|
|
*/
|
2020-01-30 18:06:58 +08:00
|
|
|
smp_mb__after_atomic();
|
2019-04-26 00:05:36 +08:00
|
|
|
|
2019-04-26 00:05:37 +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
|
|
|
|
2013-03-21 19:36:52 +08:00
|
|
|
static bool usb_serial_generic_msr_changed(struct tty_struct *tty,
|
|
|
|
unsigned long arg, struct async_icount *cprev)
|
|
|
|
{
|
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
struct async_icount cnow;
|
|
|
|
unsigned long flags;
|
|
|
|
bool ret;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Use tty-port initialised flag to detect all hangups including the
|
|
|
|
* one generated at USB-device disconnect.
|
|
|
|
*/
|
2016-04-10 08:53:25 +08:00
|
|
|
if (!tty_port_initialized(&port->port))
|
2013-03-21 19:36:52 +08:00
|
|
|
return true;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
cnow = port->icount; /* atomic copy*/
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
|
|
|
|
((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
|
|
|
|
((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
|
|
|
|
((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
|
|
|
|
|
|
|
|
*cprev = cnow;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
struct async_icount cnow;
|
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
cnow = port->icount; /* atomic copy */
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
ret = wait_event_interruptible(port->port.delta_msr_wait,
|
|
|
|
usb_serial_generic_msr_changed(tty, arg, &cnow));
|
2016-04-10 08:53:25 +08:00
|
|
|
if (!ret && !tty_port_initialized(&port->port))
|
2013-06-26 22:47:21 +08:00
|
|
|
ret = -EIO;
|
2013-03-21 19:36:52 +08:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait);
|
|
|
|
|
2013-03-21 19:36:54 +08:00
|
|
|
int usb_serial_generic_get_icount(struct tty_struct *tty,
|
|
|
|
struct serial_icounter_struct *icount)
|
|
|
|
{
|
|
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
struct async_icount cnow;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
cnow = port->icount; /* atomic copy */
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
|
|
|
|
icount->cts = cnow.cts;
|
|
|
|
icount->dsr = cnow.dsr;
|
|
|
|
icount->rng = cnow.rng;
|
|
|
|
icount->dcd = cnow.dcd;
|
|
|
|
icount->tx = cnow.tx;
|
|
|
|
icount->rx = cnow.rx;
|
|
|
|
icount->frame = cnow.frame;
|
|
|
|
icount->parity = cnow.parity;
|
|
|
|
icount->overrun = cnow.overrun;
|
|
|
|
icount->brk = cnow.brk;
|
|
|
|
icount->buf_overrun = cnow.buf_overrun;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount);
|
|
|
|
|
2020-07-08 20:49:56 +08:00
|
|
|
#if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(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
|
|
|
{
|
2020-07-08 20:49:54 +08:00
|
|
|
if (port->sysrq) {
|
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;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
|
2020-07-08 20:49:56 +08:00
|
|
|
#endif
|
2009-05-12 04:24:09 +08:00
|
|
|
|
|
|
|
int usb_serial_handle_break(struct usb_serial_port *port)
|
|
|
|
{
|
2020-07-08 20:49:55 +08:00
|
|
|
if (!port->port.console || !IS_ENABLED(CONFIG_MAGIC_SYSRQ))
|
2020-07-08 20:49:54 +08:00
|
|
|
return 0;
|
|
|
|
|
2009-05-12 04:24:09 +08:00
|
|
|
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
|
|
|
/**
|
2013-10-09 23:01:10 +08:00
|
|
|
* usb_serial_handle_dcd_change - handle a change of carrier detect state
|
|
|
|
* @port: usb-serial port
|
|
|
|
* @tty: tty for the port
|
|
|
|
* @status: new carrier detect status, nonzero if active
|
2011-01-14 21:30:21 +08:00
|
|
|
*/
|
2020-02-25 18:24:20 +08:00
|
|
|
void usb_serial_handle_dcd_change(struct usb_serial_port *port,
|
2011-01-14 21:30:21 +08:00
|
|
|
struct tty_struct *tty, unsigned int status)
|
|
|
|
{
|
2020-02-25 18:24:20 +08:00
|
|
|
dev_dbg(&port->dev, "%s - status %d\n", __func__, status);
|
2011-01-14 21:30:21 +08:00
|
|
|
|
2013-09-16 14:41:00 +08:00
|
|
|
if (tty) {
|
|
|
|
struct tty_ldisc *ld = tty_ldisc_ref(tty);
|
|
|
|
|
|
|
|
if (ld) {
|
|
|
|
if (ld->ops->dcd_change)
|
|
|
|
ld->ops->dcd_change(tty, status);
|
|
|
|
tty_ldisc_deref(ld);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-01-14 21:30:21 +08:00
|
|
|
if (status)
|
2020-02-25 18:24:20 +08:00
|
|
|
wake_up_interruptible(&port->port.open_wait);
|
2011-01-14 21:30:21 +08:00
|
|
|
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];
|
2016-04-10 08:53:25 +08:00
|
|
|
if (!tty_port_initialized(&port->port))
|
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) {
|
2013-10-09 23:01:11 +08:00
|
|
|
r = usb_serial_generic_write_start(port, GFP_NOIO);
|
2009-08-29 03:54:27 +08:00
|
|
|
if (r < 0)
|
|
|
|
c++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return c ? -EIO : 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_resume);
|