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![Johan Hovold](/assets/img/avatar_default.png)
Use process_read_urb to implement line status handling. Compile-only tested. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
603 lines
17 KiB
C
603 lines
17 KiB
C
/*
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* Belkin USB Serial Adapter Driver
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*
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* Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
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* Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
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*
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* This program is largely derived from work by the linux-usb group
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* and associated source files. Please see the usb/serial files for
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* individual credits and copyrights.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* See Documentation/usb/usb-serial.txt for more information on using this
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* driver
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*
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* TODO:
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* -- Add true modem contol line query capability. Currently we track the
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* states reported by the interrupt and the states we request.
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* -- Add error reporting back to application for UART error conditions.
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* Just point me at how to implement this and I'll do it. I've put the
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* framework in, but haven't analyzed the "tty_flip" interface yet.
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* -- Add support for flush commands
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* -- Add everything that is missing :)
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*
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* 27-Nov-2001 gkh
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* compressed all the differnent device entries into 1.
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*
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* 30-May-2001 gkh
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* switched from using spinlock to a semaphore, which fixes lots of
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* problems.
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*
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* 08-Apr-2001 gb
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* - Identify version on module load.
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*
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* 12-Mar-2001 gkh
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* - Added support for the GoHubs GO-COM232 device which is the same as the
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* Peracom device.
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*
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* 06-Nov-2000 gkh
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* - Added support for the old Belkin and Peracom devices.
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* - Made the port able to be opened multiple times.
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* - Added some defaults incase the line settings are things these devices
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* can't support.
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*
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* 18-Oct-2000 William Greathouse
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* Released into the wild (linux-usb-devel)
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*
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* 17-Oct-2000 William Greathouse
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* Add code to recognize firmware version and set hardware flow control
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* appropriately. Belkin states that firmware prior to 3.05 does not
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* operate correctly in hardware handshake mode. I have verified this
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* on firmware 2.05 -- for both RTS and DTR input flow control, the control
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* line is not reset. The test performed by the Belkin Win* driver is
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* to enable hardware flow control for firmware 2.06 or greater and
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* for 1.00 or prior. I am only enabling for 2.06 or greater.
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*
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* 12-Oct-2000 William Greathouse
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* First cut at supporting Belkin USB Serial Adapter F5U103
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* I did not have a copy of the original work to support this
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* adapter, so pardon any stupid mistakes. All of the information
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* I am using to write this driver was acquired by using a modified
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* UsbSnoop on Windows2000 and from examining the other USB drivers.
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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/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include "belkin_sa.h"
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static int debug;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.3"
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#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
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#define DRIVER_DESC "USB Belkin Serial converter driver"
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/* function prototypes for a Belkin USB Serial Adapter F5U103 */
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static int belkin_sa_startup(struct usb_serial *serial);
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static void belkin_sa_release(struct usb_serial *serial);
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static int belkin_sa_open(struct tty_struct *tty,
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struct usb_serial_port *port);
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static void belkin_sa_close(struct usb_serial_port *port);
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static void belkin_sa_read_int_callback(struct urb *urb);
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static void belkin_sa_process_read_urb(struct urb *urb);
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static void belkin_sa_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios * old);
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static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
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static int belkin_sa_tiocmget(struct tty_struct *tty, struct file *file);
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static int belkin_sa_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear);
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static const struct usb_device_id id_table_combined[] = {
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{ USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
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{ USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
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{ USB_DEVICE(PERACOM_VID, PERACOM_PID) },
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{ USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
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{ USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
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{ USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table_combined);
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static struct usb_driver belkin_driver = {
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.name = "belkin",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table_combined,
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.no_dynamic_id = 1,
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};
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/* All of the device info needed for the serial converters */
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static struct usb_serial_driver belkin_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "belkin",
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},
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.description = "Belkin / Peracom / GoHubs USB Serial Adapter",
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.usb_driver = &belkin_driver,
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.id_table = id_table_combined,
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.num_ports = 1,
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.open = belkin_sa_open,
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.close = belkin_sa_close,
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.read_int_callback = belkin_sa_read_int_callback,
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.process_read_urb = belkin_sa_process_read_urb,
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.set_termios = belkin_sa_set_termios,
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.break_ctl = belkin_sa_break_ctl,
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.tiocmget = belkin_sa_tiocmget,
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.tiocmset = belkin_sa_tiocmset,
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.attach = belkin_sa_startup,
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.release = belkin_sa_release,
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};
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struct belkin_sa_private {
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spinlock_t lock;
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unsigned long control_state;
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unsigned char last_lsr;
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unsigned char last_msr;
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int bad_flow_control;
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};
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/*
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* ***************************************************************************
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* Belkin USB Serial Adapter F5U103 specific driver functions
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* ***************************************************************************
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*/
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#define WDR_TIMEOUT 5000 /* default urb timeout */
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/* assumes that struct usb_serial *serial is available */
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#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
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(c), BELKIN_SA_SET_REQUEST_TYPE, \
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(v), 0, NULL, 0, WDR_TIMEOUT)
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/* do some startup allocations not currently performed by usb_serial_probe() */
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static int belkin_sa_startup(struct usb_serial *serial)
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{
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struct usb_device *dev = serial->dev;
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struct belkin_sa_private *priv;
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/* allocate the private data structure */
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priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
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if (!priv)
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return -1; /* error */
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/* set initial values for control structures */
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spin_lock_init(&priv->lock);
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priv->control_state = 0;
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priv->last_lsr = 0;
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priv->last_msr = 0;
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/* see comments at top of file */
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priv->bad_flow_control =
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(le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
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dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
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le16_to_cpu(dev->descriptor.bcdDevice),
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priv->bad_flow_control);
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init_waitqueue_head(&serial->port[0]->write_wait);
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usb_set_serial_port_data(serial->port[0], priv);
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return 0;
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}
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static void belkin_sa_release(struct usb_serial *serial)
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{
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int i;
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dbg("%s", __func__);
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for (i = 0; i < serial->num_ports; ++i)
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kfree(usb_get_serial_port_data(serial->port[i]));
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}
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static int belkin_sa_open(struct tty_struct *tty,
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struct usb_serial_port *port)
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{
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int retval;
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dbg("%s port %d", __func__, port->number);
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retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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if (retval) {
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dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
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return retval;
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}
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retval = usb_serial_generic_open(tty, port);
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if (retval)
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usb_kill_urb(port->interrupt_in_urb);
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return retval;
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}
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static void belkin_sa_close(struct usb_serial_port *port)
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{
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dbg("%s port %d", __func__, port->number);
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usb_serial_generic_close(port);
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usb_kill_urb(port->interrupt_in_urb);
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}
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static void belkin_sa_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct belkin_sa_private *priv;
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unsigned char *data = urb->transfer_buffer;
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int retval;
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int status = urb->status;
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unsigned long flags;
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__func__, status);
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goto exit;
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}
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usb_serial_debug_data(debug, &port->dev, __func__,
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urb->actual_length, data);
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/* Handle known interrupt data */
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/* ignore data[0] and data[1] */
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priv = usb_get_serial_port_data(port);
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spin_lock_irqsave(&priv->lock, flags);
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priv->last_msr = data[BELKIN_SA_MSR_INDEX];
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/* Record Control Line states */
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if (priv->last_msr & BELKIN_SA_MSR_DSR)
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priv->control_state |= TIOCM_DSR;
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else
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priv->control_state &= ~TIOCM_DSR;
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if (priv->last_msr & BELKIN_SA_MSR_CTS)
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priv->control_state |= TIOCM_CTS;
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else
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priv->control_state &= ~TIOCM_CTS;
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if (priv->last_msr & BELKIN_SA_MSR_RI)
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priv->control_state |= TIOCM_RI;
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else
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priv->control_state &= ~TIOCM_RI;
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if (priv->last_msr & BELKIN_SA_MSR_CD)
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priv->control_state |= TIOCM_CD;
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else
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priv->control_state &= ~TIOCM_CD;
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priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
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spin_unlock_irqrestore(&priv->lock, flags);
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&port->dev, "%s - usb_submit_urb failed with "
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"result %d\n", __func__, retval);
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}
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static void belkin_sa_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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struct belkin_sa_private *priv = usb_get_serial_port_data(port);
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struct tty_struct *tty;
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unsigned char *data = urb->transfer_buffer;
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unsigned long flags;
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unsigned char status;
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char tty_flag;
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/* Update line status */
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tty_flag = TTY_NORMAL;
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spin_lock_irqsave(&priv->lock, flags);
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status = priv->last_lsr;
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priv->last_lsr &= ~BELKIN_SA_LSR_ERR;
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spin_unlock_irqrestore(&priv->lock, flags);
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if (!urb->actual_length)
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return;
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tty = tty_port_tty_get(&port->port);
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if (!tty)
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return;
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if (status & BELKIN_SA_LSR_ERR) {
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/* Break takes precedence over parity, which takes precedence
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* over framing errors. */
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if (status & BELKIN_SA_LSR_BI)
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tty_flag = TTY_BREAK;
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else if (status & BELKIN_SA_LSR_PE)
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tty_flag = TTY_PARITY;
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else if (status & BELKIN_SA_LSR_FE)
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tty_flag = TTY_FRAME;
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dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
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/* Overrun is special, not associated with a char. */
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if (status & BELKIN_SA_LSR_OE)
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tty_insert_flip_char(tty, 0, TTY_OVERRUN);
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}
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tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
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urb->actual_length);
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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}
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static void belkin_sa_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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struct usb_serial *serial = port->serial;
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struct belkin_sa_private *priv = usb_get_serial_port_data(port);
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unsigned int iflag;
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unsigned int cflag;
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unsigned int old_iflag = 0;
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unsigned int old_cflag = 0;
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__u16 urb_value = 0; /* Will hold the new flags */
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unsigned long flags;
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unsigned long control_state;
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int bad_flow_control;
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speed_t baud;
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struct ktermios *termios = tty->termios;
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iflag = termios->c_iflag;
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cflag = termios->c_cflag;
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termios->c_cflag &= ~CMSPAR;
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/* get a local copy of the current port settings */
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spin_lock_irqsave(&priv->lock, flags);
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control_state = priv->control_state;
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bad_flow_control = priv->bad_flow_control;
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spin_unlock_irqrestore(&priv->lock, flags);
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old_iflag = old_termios->c_iflag;
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old_cflag = old_termios->c_cflag;
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/* Set the baud rate */
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if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
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/* reassert DTR and (maybe) RTS on transition from B0 */
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if ((old_cflag & CBAUD) == B0) {
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control_state |= (TIOCM_DTR|TIOCM_RTS);
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if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
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dev_err(&port->dev, "Set DTR error\n");
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/* don't set RTS if using hardware flow control */
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if (!(old_cflag & CRTSCTS))
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if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST
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, 1) < 0)
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dev_err(&port->dev, "Set RTS error\n");
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}
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}
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baud = tty_get_baud_rate(tty);
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if (baud) {
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urb_value = BELKIN_SA_BAUD(baud);
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/* Clip to maximum speed */
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if (urb_value == 0)
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urb_value = 1;
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/* Turn it back into a resulting real baud rate */
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baud = BELKIN_SA_BAUD(urb_value);
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/* Report the actual baud rate back to the caller */
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tty_encode_baud_rate(tty, baud, baud);
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if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
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dev_err(&port->dev, "Set baudrate error\n");
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} else {
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/* Disable flow control */
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if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST,
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BELKIN_SA_FLOW_NONE) < 0)
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dev_err(&port->dev, "Disable flowcontrol error\n");
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/* Drop RTS and DTR */
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control_state &= ~(TIOCM_DTR | TIOCM_RTS);
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if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
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dev_err(&port->dev, "DTR LOW error\n");
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if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
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dev_err(&port->dev, "RTS LOW error\n");
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}
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/* set the parity */
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if ((cflag ^ old_cflag) & (PARENB | PARODD)) {
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if (cflag & PARENB)
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urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD
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: BELKIN_SA_PARITY_EVEN;
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else
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urb_value = BELKIN_SA_PARITY_NONE;
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if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
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dev_err(&port->dev, "Set parity error\n");
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}
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/* set the number of data bits */
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if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
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switch (cflag & CSIZE) {
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case CS5:
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urb_value = BELKIN_SA_DATA_BITS(5);
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break;
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case CS6:
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urb_value = BELKIN_SA_DATA_BITS(6);
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break;
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case CS7:
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urb_value = BELKIN_SA_DATA_BITS(7);
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break;
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case CS8:
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urb_value = BELKIN_SA_DATA_BITS(8);
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break;
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default: dbg("CSIZE was not CS5-CS8, using default of 8");
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urb_value = BELKIN_SA_DATA_BITS(8);
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break;
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}
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if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
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dev_err(&port->dev, "Set data bits error\n");
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}
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/* set the number of stop bits */
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if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
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urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2)
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: BELKIN_SA_STOP_BITS(1);
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if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST,
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urb_value) < 0)
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|
dev_err(&port->dev, "Set stop bits error\n");
|
|
}
|
|
|
|
/* Set flow control */
|
|
if (((iflag ^ old_iflag) & (IXOFF | IXON)) ||
|
|
((cflag ^ old_cflag) & CRTSCTS)) {
|
|
urb_value = 0;
|
|
if ((iflag & IXOFF) || (iflag & IXON))
|
|
urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
|
|
else
|
|
urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
|
|
|
|
if (cflag & CRTSCTS)
|
|
urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
|
|
else
|
|
urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
|
|
|
|
if (bad_flow_control)
|
|
urb_value &= ~(BELKIN_SA_FLOW_IRTS);
|
|
|
|
if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
|
|
dev_err(&port->dev, "Set flow control error\n");
|
|
}
|
|
|
|
/* save off the modified port settings */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->control_state = control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
|
|
static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct usb_serial *serial = port->serial;
|
|
|
|
if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
|
|
dev_err(&port->dev, "Set break_ctl %d\n", break_state);
|
|
}
|
|
|
|
static int belkin_sa_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct belkin_sa_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long control_state;
|
|
unsigned long flags;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control_state = priv->control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return control_state;
|
|
}
|
|
|
|
static int belkin_sa_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct usb_serial *serial = port->serial;
|
|
struct belkin_sa_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long control_state;
|
|
unsigned long flags;
|
|
int retval;
|
|
int rts = 0;
|
|
int dtr = 0;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control_state = priv->control_state;
|
|
|
|
if (set & TIOCM_RTS) {
|
|
control_state |= TIOCM_RTS;
|
|
rts = 1;
|
|
}
|
|
if (set & TIOCM_DTR) {
|
|
control_state |= TIOCM_DTR;
|
|
dtr = 1;
|
|
}
|
|
if (clear & TIOCM_RTS) {
|
|
control_state &= ~TIOCM_RTS;
|
|
rts = 0;
|
|
}
|
|
if (clear & TIOCM_DTR) {
|
|
control_state &= ~TIOCM_DTR;
|
|
dtr = 0;
|
|
}
|
|
|
|
priv->control_state = control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
|
|
if (retval < 0) {
|
|
dev_err(&port->dev, "Set RTS error %d\n", retval);
|
|
goto exit;
|
|
}
|
|
|
|
retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
|
|
if (retval < 0) {
|
|
dev_err(&port->dev, "Set DTR error %d\n", retval);
|
|
goto exit;
|
|
}
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
|
|
static int __init belkin_sa_init(void)
|
|
{
|
|
int retval;
|
|
retval = usb_serial_register(&belkin_device);
|
|
if (retval)
|
|
goto failed_usb_serial_register;
|
|
retval = usb_register(&belkin_driver);
|
|
if (retval)
|
|
goto failed_usb_register;
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
|
|
DRIVER_DESC "\n");
|
|
return 0;
|
|
failed_usb_register:
|
|
usb_serial_deregister(&belkin_device);
|
|
failed_usb_serial_register:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit belkin_sa_exit (void)
|
|
{
|
|
usb_deregister(&belkin_driver);
|
|
usb_serial_deregister(&belkin_device);
|
|
}
|
|
|
|
|
|
module_init(belkin_sa_init);
|
|
module_exit(belkin_sa_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|