--- /dev/null
+/*
+ * Belkin USB Serial Adapter Driver
+ *
+ * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
+ * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
+ *
+ * This program is largely derived from work by the linux-usb group
+ * and associated source files. Please see the usb/serial files for
+ * individual credits and copyrights.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this
+ * driver
+ *
+ * TODO:
+ * -- Add true modem control line query capability. Currently we track the
+ * states reported by the interrupt and the states we request.
+ * -- Add support for flush commands
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include "belkin_sa.h"
+
+#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
+#define DRIVER_DESC "USB Belkin Serial converter driver"
+
+/* function prototypes for a Belkin USB Serial Adapter F5U103 */
+static int belkin_sa_port_probe(struct usb_serial_port *port);
+static int belkin_sa_port_remove(struct usb_serial_port *port);
+static int belkin_sa_open(struct tty_struct *tty,
+ struct usb_serial_port *port);
+static void belkin_sa_close(struct usb_serial_port *port);
+static void belkin_sa_read_int_callback(struct urb *urb);
+static void belkin_sa_process_read_urb(struct urb *urb);
+static void belkin_sa_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios * old);
+static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
+static int belkin_sa_tiocmget(struct tty_struct *tty);
+static int belkin_sa_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear);
+
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
+ { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
+ { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
+ { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
+ { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
+ { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
+ { } /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* All of the device info needed for the serial converters */
+static struct usb_serial_driver belkin_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "belkin",
+ },
+ .description = "Belkin / Peracom / GoHubs USB Serial Adapter",
+ .id_table = id_table,
+ .num_ports = 1,
+ .open = belkin_sa_open,
+ .close = belkin_sa_close,
+ .read_int_callback = belkin_sa_read_int_callback,
+ .process_read_urb = belkin_sa_process_read_urb,
+ .set_termios = belkin_sa_set_termios,
+ .break_ctl = belkin_sa_break_ctl,
+ .tiocmget = belkin_sa_tiocmget,
+ .tiocmset = belkin_sa_tiocmset,
+ .port_probe = belkin_sa_port_probe,
+ .port_remove = belkin_sa_port_remove,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &belkin_device, NULL
+};
+
+struct belkin_sa_private {
+ spinlock_t lock;
+ unsigned long control_state;
+ unsigned char last_lsr;
+ unsigned char last_msr;
+ int bad_flow_control;
+};
+
+
+/*
+ * ***************************************************************************
+ * Belkin USB Serial Adapter F5U103 specific driver functions
+ * ***************************************************************************
+ */
+
+#define WDR_TIMEOUT 5000 /* default urb timeout */
+
+/* assumes that struct usb_serial *serial is available */
+#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
+ (c), BELKIN_SA_SET_REQUEST_TYPE, \
+ (v), 0, NULL, 0, WDR_TIMEOUT)
+
+static int belkin_sa_port_probe(struct usb_serial_port *port)
+{
+ struct usb_device *dev = port->serial->dev;
+ struct belkin_sa_private *priv;
+
+ priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+ priv->control_state = 0;
+ priv->last_lsr = 0;
+ priv->last_msr = 0;
+ /* see comments at top of file */
+ priv->bad_flow_control =
+ (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
+ dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
+ le16_to_cpu(dev->descriptor.bcdDevice),
+ priv->bad_flow_control);
+
+ usb_set_serial_port_data(port, priv);
+
+ return 0;
+}
+
+static int belkin_sa_port_remove(struct usb_serial_port *port)
+{
+ struct belkin_sa_private *priv;
+
+ priv = usb_get_serial_port_data(port);
+ kfree(priv);
+
+ return 0;
+}
+
+static int belkin_sa_open(struct tty_struct *tty,
+ struct usb_serial_port *port)
+{
+ int retval;
+
+ retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
+ return retval;
+ }
+
+ retval = usb_serial_generic_open(tty, port);
+ if (retval)
+ usb_kill_urb(port->interrupt_in_urb);
+
+ return retval;
+}
+
+static void belkin_sa_close(struct usb_serial_port *port)
+{
+ usb_serial_generic_close(port);
+ usb_kill_urb(port->interrupt_in_urb);
+}
+
+static void belkin_sa_read_int_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct belkin_sa_private *priv;
+ unsigned char *data = urb->transfer_buffer;
+ int retval;
+ int status = urb->status;
+ unsigned long flags;
+
+ switch (status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
+ __func__, status);
+ return;
+ default:
+ dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
+ __func__, status);
+ goto exit;
+ }
+
+ usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
+
+ /* Handle known interrupt data */
+ /* ignore data[0] and data[1] */
+
+ priv = usb_get_serial_port_data(port);
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->last_msr = data[BELKIN_SA_MSR_INDEX];
+
+ /* Record Control Line states */
+ if (priv->last_msr & BELKIN_SA_MSR_DSR)
+ priv->control_state |= TIOCM_DSR;
+ else
+ priv->control_state &= ~TIOCM_DSR;
+
+ if (priv->last_msr & BELKIN_SA_MSR_CTS)
+ priv->control_state |= TIOCM_CTS;
+ else
+ priv->control_state &= ~TIOCM_CTS;
+
+ if (priv->last_msr & BELKIN_SA_MSR_RI)
+ priv->control_state |= TIOCM_RI;
+ else
+ priv->control_state &= ~TIOCM_RI;
+
+ if (priv->last_msr & BELKIN_SA_MSR_CD)
+ priv->control_state |= TIOCM_CD;
+ else
+ priv->control_state &= ~TIOCM_CD;
+
+ priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
+ spin_unlock_irqrestore(&priv->lock, flags);
+exit:
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+ if (retval)
+ dev_err(&port->dev, "%s - usb_submit_urb failed with "
+ "result %d\n", __func__, retval);
+}
+
+static void belkin_sa_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct belkin_sa_private *priv = usb_get_serial_port_data(port);
+ unsigned char *data = urb->transfer_buffer;
+ unsigned long flags;
+ unsigned char status;
+ char tty_flag;
+
+ /* Update line status */
+ tty_flag = TTY_NORMAL;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ status = priv->last_lsr;
+ priv->last_lsr &= ~BELKIN_SA_LSR_ERR;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (!urb->actual_length)
+ return;
+
+ if (status & BELKIN_SA_LSR_ERR) {
+ /* Break takes precedence over parity, which takes precedence
+ * over framing errors. */
+ if (status & BELKIN_SA_LSR_BI)
+ tty_flag = TTY_BREAK;
+ else if (status & BELKIN_SA_LSR_PE)
+ tty_flag = TTY_PARITY;
+ else if (status & BELKIN_SA_LSR_FE)
+ tty_flag = TTY_FRAME;
+ dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
+
+ /* Overrun is special, not associated with a char. */
+ if (status & BELKIN_SA_LSR_OE)
+ tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
+ }
+
+ tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
+ urb->actual_length);
+ tty_flip_buffer_push(&port->port);
+}
+
+static void belkin_sa_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ struct usb_serial *serial = port->serial;
+ struct belkin_sa_private *priv = usb_get_serial_port_data(port);
+ unsigned int iflag;
+ unsigned int cflag;
+ unsigned int old_iflag = 0;
+ unsigned int old_cflag = 0;
+ __u16 urb_value = 0; /* Will hold the new flags */
+ unsigned long flags;
+ unsigned long control_state;
+ int bad_flow_control;
+ speed_t baud;
+ struct ktermios *termios = &tty->termios;
+
+ iflag = termios->c_iflag;
+ cflag = termios->c_cflag;
+
+ termios->c_cflag &= ~CMSPAR;
+
+ /* get a local copy of the current port settings */
+ spin_lock_irqsave(&priv->lock, flags);
+ control_state = priv->control_state;
+ bad_flow_control = priv->bad_flow_control;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ old_iflag = old_termios->c_iflag;
+ old_cflag = old_termios->c_cflag;
+
+ /* Set the baud rate */
+ if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
+ /* reassert DTR and (maybe) RTS on transition from B0 */
+ if ((old_cflag & CBAUD) == B0) {
+ control_state |= (TIOCM_DTR|TIOCM_RTS);
+ if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
+ dev_err(&port->dev, "Set DTR error\n");
+ /* don't set RTS if using hardware flow control */
+ if (!(old_cflag & CRTSCTS))
+ if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST
+ , 1) < 0)
+ dev_err(&port->dev, "Set RTS error\n");
+ }
+ }
+
+ baud = tty_get_baud_rate(tty);
+ if (baud) {
+ urb_value = BELKIN_SA_BAUD(baud);
+ /* Clip to maximum speed */
+ if (urb_value == 0)
+ urb_value = 1;
+ /* Turn it back into a resulting real baud rate */
+ baud = BELKIN_SA_BAUD(urb_value);
+
+ /* Report the actual baud rate back to the caller */
+ tty_encode_baud_rate(tty, baud, baud);
+ if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
+ dev_err(&port->dev, "Set baudrate error\n");
+ } else {
+ /* Disable flow control */
+ if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST,
+ BELKIN_SA_FLOW_NONE) < 0)
+ dev_err(&port->dev, "Disable flowcontrol error\n");
+ /* Drop RTS and DTR */
+ control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+ if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
+ dev_err(&port->dev, "DTR LOW error\n");
+ if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
+ dev_err(&port->dev, "RTS LOW error\n");
+ }
+
+ /* set the parity */
+ if ((cflag ^ old_cflag) & (PARENB | PARODD)) {
+ if (cflag & PARENB)
+ urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD
+ : BELKIN_SA_PARITY_EVEN;
+ else
+ urb_value = BELKIN_SA_PARITY_NONE;
+ if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
+ dev_err(&port->dev, "Set parity error\n");
+ }
+
+ /* set the number of data bits */
+ if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+ switch (cflag & CSIZE) {
+ case CS5:
+ urb_value = BELKIN_SA_DATA_BITS(5);
+ break;
+ case CS6:
+ urb_value = BELKIN_SA_DATA_BITS(6);
+ break;
+ case CS7:
+ urb_value = BELKIN_SA_DATA_BITS(7);
+ break;
+ case CS8:
+ urb_value = BELKIN_SA_DATA_BITS(8);
+ break;
+ default:
+ dev_dbg(&port->dev,
+ "CSIZE was not CS5-CS8, using default of 8\n");
+ urb_value = BELKIN_SA_DATA_BITS(8);
+ break;
+ }
+ if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
+ dev_err(&port->dev, "Set data bits error\n");
+ }
+
+ /* set the number of stop bits */
+ if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
+ urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2)
+ : BELKIN_SA_STOP_BITS(1);
+ if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST,
+ urb_value) < 0)
+ 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 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;
+
+ 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,
+ 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;
+
+ 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;
+}
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff