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![Johan Hovold](/assets/img/avatar_default.png)
Make sure to handle an infinite timeout (0).
Note that wait_until_sent is currently never called with a 0-timeout
argument due to a bug in tty_wait_until_sent.
Fixes: dcf0105039
("USB: serial: add generic wait_until_sent
implementation")
Cc: stable <stable@vger.kernel.org> # v3.10
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
628 lines
16 KiB
C
628 lines
16 KiB
C
/*
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* USB Serial Converter Generic functions
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*
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* Copyright (C) 2010 - 2013 Johan Hovold (jhovold@gmail.com)
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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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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/sysrq.h>
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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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#include <linux/usb/serial.h>
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#include <linux/uaccess.h>
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#include <linux/kfifo.h>
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#include <linux/serial.h>
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#ifdef CONFIG_USB_SERIAL_GENERIC
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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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struct usb_serial_driver usb_serial_generic_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "generic",
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},
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.id_table = generic_device_ids,
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.num_ports = 1,
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.throttle = usb_serial_generic_throttle,
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.unthrottle = usb_serial_generic_unthrottle,
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.resume = usb_serial_generic_resume,
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};
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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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#endif
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int usb_serial_generic_register(void)
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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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generic_device_ids[0].match_flags =
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USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
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retval = usb_serial_register_drivers(serial_drivers,
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"usbserial_generic", generic_device_ids);
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#endif
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return retval;
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}
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void usb_serial_generic_deregister(void)
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{
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#ifdef CONFIG_USB_SERIAL_GENERIC
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usb_serial_deregister_drivers(serial_drivers);
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#endif
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}
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int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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int result = 0;
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unsigned long 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 (port->bulk_in_size)
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result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
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return result;
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_open);
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void usb_serial_generic_close(struct usb_serial_port *port)
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{
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unsigned long flags;
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int i;
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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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}
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_close);
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int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
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void *dest, size_t size)
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{
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return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock);
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}
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/**
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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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* @mem_flags: flags to use for memory allocations
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*
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* Serialised using USB_SERIAL_WRITE_BUSY flag.
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*
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* Return: Zero on success or if busy, otherwise a negative errno value.
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*/
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int usb_serial_generic_write_start(struct usb_serial_port *port,
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gfp_t mem_flags)
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{
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struct urb *urb;
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int count, result;
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unsigned long flags;
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int i;
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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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spin_lock_irqsave(&port->lock, flags);
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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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spin_unlock_irqrestore(&port->lock, flags);
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return 0;
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}
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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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spin_unlock_irqrestore(&port->lock, flags);
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urb = port->write_urbs[i];
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count = port->serial->type->prepare_write_buffer(port,
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urb->transfer_buffer,
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port->bulk_out_size);
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urb->transfer_buffer_length = count;
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usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer);
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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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result = usb_submit_urb(urb, mem_flags);
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if (result) {
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dev_err_console(port, "%s - error submitting urb: %d\n",
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__func__, result);
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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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clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
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return result;
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}
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goto retry; /* try sending off another urb */
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_write_start);
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/**
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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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*
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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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*/
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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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{
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int result;
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if (!port->bulk_out_size)
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return -ENODEV;
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if (!count)
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return 0;
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count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
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result = usb_serial_generic_write_start(port, GFP_ATOMIC);
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if (result)
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return result;
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return count;
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_write);
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int usb_serial_generic_write_room(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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unsigned long flags;
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int room;
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if (!port->bulk_out_size)
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return 0;
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spin_lock_irqsave(&port->lock, flags);
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room = kfifo_avail(&port->write_fifo);
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spin_unlock_irqrestore(&port->lock, flags);
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dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
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return room;
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}
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int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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unsigned long flags;
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int chars;
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if (!port->bulk_out_size)
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return 0;
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spin_lock_irqsave(&port->lock, flags);
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chars = kfifo_len(&port->write_fifo) + port->tx_bytes;
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spin_unlock_irqrestore(&port->lock, flags);
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dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
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return chars;
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer);
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void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout)
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{
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struct usb_serial_port *port = tty->driver_data;
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unsigned int bps;
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unsigned long period;
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unsigned long expire;
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bps = tty_get_baud_rate(tty);
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if (!bps)
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bps = 9600; /* B0 */
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/*
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* Use a poll-period of roughly the time it takes to send one
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* character or at least one jiffy.
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*/
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period = max_t(unsigned long, (10 * HZ / bps), 1);
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if (timeout)
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period = min_t(unsigned long, period, timeout);
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dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n",
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__func__, jiffies_to_msecs(timeout),
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jiffies_to_msecs(period));
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expire = jiffies + timeout;
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while (!port->serial->type->tx_empty(port)) {
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schedule_timeout_interruptible(period);
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if (signal_pending(current))
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break;
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if (timeout && time_after(jiffies, expire))
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break;
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}
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_wait_until_sent);
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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;
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dev_dbg(&port->dev, "%s - urb %d\n", __func__, index);
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res = usb_submit_urb(port->read_urbs[index], mem_flags);
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if (res) {
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if (res != -EPERM && res != -ENODEV) {
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dev_err(&port->dev,
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"%s - usb_submit_urb failed: %d\n",
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__func__, res);
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}
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set_bit(index, &port->read_urbs_free);
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return res;
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}
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return 0;
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}
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int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
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gfp_t mem_flags)
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{
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int res;
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int i;
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for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
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res = usb_serial_generic_submit_read_urb(port, i, mem_flags);
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if (res)
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goto err;
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}
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return 0;
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err:
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for (; i >= 0; --i)
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usb_kill_urb(port->read_urbs[i]);
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return res;
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs);
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void usb_serial_generic_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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char *ch = (char *)urb->transfer_buffer;
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int i;
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if (!urb->actual_length)
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return;
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/*
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* The per character mucking around with sysrq path it too slow for
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* stuff like 3G modems, so shortcircuit it in the 99.9999999% of
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* cases where the USB serial is not a console anyway.
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*/
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if (!port->port.console || !port->sysrq) {
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tty_insert_flip_string(&port->port, ch, urb->actual_length);
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} else {
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for (i = 0; i < urb->actual_length; i++, ch++) {
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if (!usb_serial_handle_sysrq_char(port, *ch))
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tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
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}
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}
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tty_flip_buffer_push(&port->port);
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb);
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void usb_serial_generic_read_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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unsigned long flags;
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int i;
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for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
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if (urb == port->read_urbs[i])
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break;
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}
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set_bit(i, &port->read_urbs_free);
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dev_dbg(&port->dev, "%s - urb %d, len %d\n", __func__, i,
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urb->actual_length);
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switch (urb->status) {
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case 0:
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break;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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dev_dbg(&port->dev, "%s - urb stopped: %d\n",
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__func__, urb->status);
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return;
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case -EPIPE:
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dev_err(&port->dev, "%s - urb stopped: %d\n",
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__func__, urb->status);
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return;
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default:
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dev_dbg(&port->dev, "%s - nonzero urb status: %d\n",
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__func__, urb->status);
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goto resubmit;
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}
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usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
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port->serial->type->process_read_urb(urb);
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resubmit:
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/* Throttle the device if requested by tty */
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spin_lock_irqsave(&port->lock, flags);
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port->throttled = port->throttle_req;
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if (!port->throttled) {
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spin_unlock_irqrestore(&port->lock, flags);
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usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC);
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} else {
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spin_unlock_irqrestore(&port->lock, flags);
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}
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
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void usb_serial_generic_write_bulk_callback(struct urb *urb)
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{
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unsigned long flags;
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struct usb_serial_port *port = urb->context;
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int i;
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for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
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if (port->write_urbs[i] == urb)
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break;
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}
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spin_lock_irqsave(&port->lock, flags);
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port->tx_bytes -= urb->transfer_buffer_length;
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set_bit(i, &port->write_urbs_free);
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spin_unlock_irqrestore(&port->lock, flags);
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switch (urb->status) {
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case 0:
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break;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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dev_dbg(&port->dev, "%s - urb stopped: %d\n",
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__func__, urb->status);
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return;
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case -EPIPE:
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dev_err_console(port, "%s - urb stopped: %d\n",
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__func__, urb->status);
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return;
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default:
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dev_err_console(port, "%s - nonzero urb status: %d\n",
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__func__, urb->status);
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goto resubmit;
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}
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resubmit:
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usb_serial_generic_write_start(port, GFP_ATOMIC);
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usb_serial_port_softint(port);
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
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void usb_serial_generic_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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port->throttle_req = 1;
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spin_unlock_irqrestore(&port->lock, flags);
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_throttle);
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void usb_serial_generic_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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int was_throttled;
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spin_lock_irq(&port->lock);
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was_throttled = port->throttled;
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port->throttled = port->throttle_req = 0;
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spin_unlock_irq(&port->lock);
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if (was_throttled)
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usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
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}
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EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle);
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static bool usb_serial_generic_msr_changed(struct tty_struct *tty,
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unsigned long arg, struct async_icount *cprev)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct async_icount cnow;
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unsigned long flags;
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bool ret;
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/*
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* Use tty-port initialised flag to detect all hangups including the
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* one generated at USB-device disconnect.
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*/
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if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
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return true;
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spin_lock_irqsave(&port->lock, flags);
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cnow = port->icount; /* atomic copy*/
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spin_unlock_irqrestore(&port->lock, flags);
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ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
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((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
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((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
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((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
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*cprev = cnow;
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return ret;
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}
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int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg)
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{
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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));
|
|
if (!ret && !test_bit(ASYNCB_INITIALIZED, &port->port.flags))
|
|
ret = -EIO;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait);
|
|
|
|
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);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
|
|
{
|
|
if (port->sysrq && port->port.console) {
|
|
if (ch && time_before(jiffies, port->sysrq)) {
|
|
handle_sysrq(ch);
|
|
port->sysrq = 0;
|
|
return 1;
|
|
}
|
|
port->sysrq = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
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);
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
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;
|
|
|
|
dev_dbg(&usb_port->dev, "%s - status %d\n", __func__, status);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
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];
|
|
if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
|
|
continue;
|
|
|
|
if (port->bulk_in_size) {
|
|
r = usb_serial_generic_submit_read_urbs(port,
|
|
GFP_NOIO);
|
|
if (r < 0)
|
|
c++;
|
|
}
|
|
|
|
if (port->bulk_out_size) {
|
|
r = usb_serial_generic_write_start(port, GFP_NOIO);
|
|
if (r < 0)
|
|
c++;
|
|
}
|
|
}
|
|
|
|
return c ? -EIO : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_generic_resume);
|