patch-2.2.18 linux/drivers/usb/serial/belkin_sa.c

• Lines: 562
• Date: Fri Nov 10 01:41:35 2000
• Orig file: v2.2.17/drivers/usb/serial/belkin_sa.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/serial/belkin_sa.c linux/drivers/usb/serial/belkin_sa.c
@@ -0,0 +1,561 @@
+/*
+ * Belkin USB Serial Adapter Driver
+ *
+ *  Copyright (C) 2000
+ *      William Greathouse (wgreathouse@smva.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 contol line query capability.  Currently we track the
+ *    states reported by the interrupt and the states we request.
+ * -- Add error reporting back to application for UART error conditions.
+ *    Just point me at how to implement this and I'll do it. I've put the
+ *    framework in, but haven't analyzed the "tty_flip" interface yet.
+ * -- Add support for flush commands
+ * -- Add everything that is missing :)
+ *
+ * (11/06/2000) gkh
+ *	- Added support for the old Belkin and Peracom devices.
+ *	- Made the port able to be opened multiple times.
+ *	- Added some defaults incase the line settings are things these devices
+ *	  can't support. 
+ *
+ * 18-Oct-2000 William Greathouse
+ *    Released into the wild (linux-usb-devel)
+ *
+ * 17-Oct-2000 William Greathouse
+ *    Add code to recognize firmware version and set hardware flow control
+ *    appropriately.  Belkin states that firmware prior to 3.05 does not
+ *    operate correctly in hardware handshake mode.  I have verified this
+ *    on firmware 2.05 -- for both RTS and DTR input flow control, the control
+ *    line is not reset.  The test performed by the Belkin Win* driver is
+ *    to enable hardware flow control for firmware 2.06 or greater and
+ *    for 1.00 or prior.  I am only enabling for 2.06 or greater.
+ *
+ * 12-Oct-2000 William Greathouse
+ *    First cut at supporting Belkin USB Serial Adapter F5U103
+ *    I did not have a copy of the original work to support this
+ *    adapter, so pardon any stupid mistakes.  All of the information
+ *    I am using to write this driver was acquired by using a modified
+ *    UsbSnoop on Windows2000 and from examining the other USB drivers.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/malloc.h>
+#include <linux/fcntl.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#ifdef CONFIG_USB_SERIAL_DEBUG
+ 	#define DEBUG
+#else
+ 	#undef DEBUG
+#endif
+#include <linux/usb.h>
+
+#include "usb-serial.h"
+#include "belkin_sa.h"
+
+/* function prototypes for a Belkin USB Serial Adapter F5U103 */
+static int  belkin_sa_startup		(struct usb_serial *serial);
+static void belkin_sa_shutdown		(struct usb_serial *serial);
+static int  belkin_sa_open		(struct usb_serial_port *port, struct file *filp);
+static void belkin_sa_close		(struct usb_serial_port *port, struct file *filp);
+static void belkin_sa_read_int_callback (struct urb *urb);
+static void belkin_sa_set_termios	(struct usb_serial_port *port, struct termios * old);
+static int  belkin_sa_ioctl		(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
+static void belkin_sa_break_ctl		(struct usb_serial_port *port, int break_state );
+
+/* All of the device info needed for the Belkin serial converter */
+static __u16	belkin_sa_vendor_id	= BELKIN_SA_VID;
+static __u16	belkin_sa_product_id	= BELKIN_SA_PID;
+struct usb_serial_device_type belkin_sa_device = {
+	name:			"Belkin F5U103 USB Serial Adapter",
+	idVendor:		&belkin_sa_vendor_id,		/* the Belkin vendor ID */
+	idProduct:		&belkin_sa_product_id,		/* the Belkin F5U103 product id */
+	needs_interrupt_in:	MUST_HAVE,			/* this device must have an interrupt in endpoint */
+	needs_bulk_in:		MUST_HAVE,			/* this device must have a bulk in endpoint */
+	needs_bulk_out:		MUST_HAVE,			/* this device must have a bulk out endpoint */
+	num_interrupt_in:	1,
+	num_bulk_in:		1,
+	num_bulk_out:		1,
+	num_ports:		1,
+	open:			belkin_sa_open,
+	close:			belkin_sa_close,
+	read_int_callback:	belkin_sa_read_int_callback,	/* How we get the status info */
+	ioctl:			belkin_sa_ioctl,
+	set_termios:		belkin_sa_set_termios,
+	break_ctl:		belkin_sa_break_ctl,
+	startup:		belkin_sa_startup,
+	shutdown:		belkin_sa_shutdown,
+};
+
+
+/* This driver also supports the "old" school Belkin single port adaptor */
+static __u16	belkin_old_vendor_id	= BELKIN_OLD_VID;
+static __u16	belkin_old_product_id	= BELKIN_OLD_PID;
+struct usb_serial_device_type belkin_old_device = {
+	name:			"Belkin USB Serial Adapter",
+	idVendor:		&belkin_old_vendor_id,		/* the Belkin vendor ID */
+	idProduct:		&belkin_old_product_id,		/* the Belkin product id */
+	needs_interrupt_in:	MUST_HAVE,			/* this device must have an interrupt in endpoint */
+	needs_bulk_in:		MUST_HAVE,			/* this device must have a bulk in endpoint */
+	needs_bulk_out:		MUST_HAVE,			/* this device must have a bulk out endpoint */
+	num_interrupt_in:	1,
+	num_bulk_in:		1,
+	num_bulk_out:		1,
+	num_ports:		1,
+	open:			belkin_sa_open,
+	close:			belkin_sa_close,
+	read_int_callback:	belkin_sa_read_int_callback,	/* How we get the status info */
+	ioctl:			belkin_sa_ioctl,
+	set_termios:		belkin_sa_set_termios,
+	break_ctl:		belkin_sa_break_ctl,
+	startup:		belkin_sa_startup,
+	shutdown:		belkin_sa_shutdown,
+};
+
+/* this driver also works for the Peracom single port adapter */
+static __u16	peracom_vendor_id	= PERACOM_VID;
+static __u16	peracom_product_id	= PERACOM_PID;
+struct usb_serial_device_type peracom_device = {
+	name:			"Peracom single port USB Serial Adapter",
+	idVendor:		&peracom_vendor_id,		/* the Peracom vendor ID */
+	idProduct:		&peracom_product_id,		/* the Peracom product id */
+	needs_interrupt_in:	MUST_HAVE,			/* this device must have an interrupt in endpoint */
+	needs_bulk_in:		MUST_HAVE,			/* this device must have a bulk in endpoint */
+	needs_bulk_out:		MUST_HAVE,			/* this device must have a bulk out endpoint */
+	num_interrupt_in:	1,
+	num_bulk_in:		1,
+	num_bulk_out:		1,
+	num_ports:		1,
+	open:			belkin_sa_open,
+	close:			belkin_sa_close,
+	read_int_callback:	belkin_sa_read_int_callback,	/* How we get the status info */
+	ioctl:			belkin_sa_ioctl,
+	set_termios:		belkin_sa_set_termios,
+	break_ctl:		belkin_sa_break_ctl,
+	startup:		belkin_sa_startup,
+	shutdown:		belkin_sa_shutdown,
+};
+
+
+struct belkin_sa_private {
+	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 (HZ * 5 ) /* 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)
+
+/* do some startup allocations not currently performed by usb_serial_probe() */
+static int belkin_sa_startup (struct usb_serial *serial)
+{
+	struct usb_device *dev = serial->dev;
+	struct belkin_sa_private *priv;
+
+	/* allocate the private data structure */
+	serial->port->private = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
+	if (!serial->port->private)
+		return (-1); /* error */
+	priv = (struct belkin_sa_private *)serial->port->private;
+	/* set initial values for control structures */
+	priv->control_state = 0;
+	priv->last_lsr = 0;
+	priv->last_msr = 0;
+	/* see comments at top of file */
+	priv->bad_flow_control = (dev->descriptor.bcdDevice <= 0x0206) ? 1 : 0;
+	info("bcdDevice: %04x, bfc: %d", dev->descriptor.bcdDevice, priv->bad_flow_control);
+
+	init_waitqueue_head(&serial->port->write_wait);
+	
+	return (0);
+}
+
+
+static void belkin_sa_shutdown (struct usb_serial *serial)
+{
+	int i;
+	
+	dbg (__FUNCTION__);
+
+	/* stop reads and writes on all ports */
+	for (i=0; i < serial->num_ports; ++i) {
+		while (serial->port[i].open_count > 0) {
+			belkin_sa_close (&serial->port[i], NULL);
+		}
+		/* My special items, the standard routines free my urbs */
+		if (serial->port->private)
+			kfree(serial->port->private);
+	}
+}
+
+
+static int  belkin_sa_open (struct usb_serial_port *port, struct file *filp)
+{
+	unsigned long flags;
+
+	dbg(__FUNCTION__" port %d", port->number);
+
+	spin_lock_irqsave (&port->port_lock, flags);
+	
+	++port->open_count;
+	MOD_INC_USE_COUNT;
+	
+	if (!port->active) {
+		port->active = 1;
+
+		/*Start reading from the device*/
+		/* TODO: Look at possibility of submitting mulitple URBs to device to
+		 *       enhance buffering.  Win trace shows 16 initial read URBs.
+		 */
+		port->read_urb->dev = port->serial->dev;
+		if (usb_submit_urb(port->read_urb))
+			err("usb_submit_urb(read bulk) failed");
+
+		port->interrupt_in_urb->dev = port->serial->dev;
+		if (usb_submit_urb(port->interrupt_in_urb))
+			err(" usb_submit_urb(read int) failed");
+	}
+	
+	spin_unlock_irqrestore (&port->port_lock, flags);
+
+	return 0;
+} /* belkin_sa_open */
+
+
+static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
+{
+	unsigned long flags;
+
+	dbg(__FUNCTION__" port %d", port->number);
+
+	spin_lock_irqsave (&port->port_lock, flags);
+
+	--port->open_count;
+	MOD_DEC_USE_COUNT;
+
+	if (port->open_count <= 0) {
+		/* shutdown our bulk reads and writes */
+		usb_unlink_urb (port->write_urb);
+		usb_unlink_urb (port->read_urb);
+		usb_unlink_urb (port->interrupt_in_urb);	/* wgg - do I need this? I think so. */
+		port->active = 0;
+	}
+	
+	spin_unlock_irqrestore (&port->port_lock, flags);
+} /* belkin_sa_close */
+
+
+static void belkin_sa_read_int_callback (struct urb *urb)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct belkin_sa_private *priv = (struct belkin_sa_private *)port->private;
+	struct usb_serial *serial;
+	struct tty_struct *tty;
+	unsigned char *data = urb->transfer_buffer;
+
+	/* the urb might have been killed. */
+	if (urb->status)
+		return;
+	
+	if (port_paranoia_check (port, "belkin_sa_read_interrupt")) return;
+
+	serial = port->serial;
+	if (serial_paranoia_check (serial, "belkin_sa_read_interrupt")) return;
+	
+	usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
+
+	/* Handle known interrupt data */
+	/* ignore data[0] and data[1] */
+
+	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;
+
+	/* Now to report any errors */
+	priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
+#if 0
+	/*
+	 * fill in the flip buffer here, but I do not know the relation
+	 * to the current/next receive buffer or characters.  I need
+	 * to look in to this before committing any code.
+	 */
+	if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
+		tty = port->tty;
+		/* Overrun Error */
+		if (priv->last_lsr & BELKIN_SA_LSR_OE) {
+		}
+		/* Parity Error */
+		if (priv->last_lsr & BELKIN_SA_LSR_PE) {
+		}
+		/* Framing Error */
+		if (priv->last_lsr & BELKIN_SA_LSR_FE) {
+		}
+		/* Break Indicator */
+		if (priv->last_lsr & BELKIN_SA_LSR_BI) {
+		}
+	}
+#endif
+
+	/* INT urbs are automatically re-submitted */
+}
+
+static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
+{
+	struct usb_serial *serial = port->serial;
+	struct belkin_sa_private *priv = (struct belkin_sa_private *)port->private;
+	unsigned int iflag = port->tty->termios->c_iflag;
+	unsigned int cflag = port->tty->termios->c_cflag;
+	unsigned int old_iflag = old_termios->c_iflag;
+	unsigned int old_cflag = old_termios->c_cflag;
+	__u16 urb_value; /* Will hold the new flags */
+	
+	/* Set the baud rate */
+	if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
+		/* reassert DTR and (maybe) RTS on transition from B0 */
+		if( (old_cflag&CBAUD) == B0 ) {
+			priv->control_state |= (TIOCM_DTR|TIOCM_RTS);
+			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
+				err("Set DTR error");
+			/* don't set RTS if using hardware flow control */
+			if (!(old_cflag&CRTSCTS) )
+				if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
+					err("Set RTS error");
+		}
+
+		switch(cflag & CBAUD) {
+			case B0: /* handled below */ break;
+			case B300: urb_value = BELKIN_SA_BAUD(300); break;
+			case B600: urb_value = BELKIN_SA_BAUD(600); break;
+			case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
+			case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
+			case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
+			case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
+			case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
+			case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
+			case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
+			case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
+			case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
+			default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
+				urb_value = BELKIN_SA_BAUD(9600); break;
+		}
+		if ((cflag & CBAUD) != B0 ) {
+			if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
+				err("Set baudrate error");
+		} else {
+			/* Disable flow control */
+			if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
+				err("Disable flowcontrol error");
+
+			/* Drop RTS and DTR */
+			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
+				err("DTR LOW error");
+			if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
+				err("RTS LOW error");
+		}
+	}
+
+	/* set the parity */
+	if( (cflag&(PARENB|PARODD)) != (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)
+			err("Set parity error");
+	}
+
+	/* 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: err("CSIZE was not CS5-CS8, using default of 8");
+				urb_value = BELKIN_SA_DATA_BITS(8);
+				break;
+		}
+		if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
+			err("Set data bits error");
+	}
+
+	/* 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)
+			err("Set stop bits error");
+	}
+
+	/* Set flow control */
+	if( (iflag&IXOFF)   != (old_iflag&IXOFF)
+	||	(iflag&IXON)    != (old_iflag&IXON)
+	||  (cflag&CRTSCTS) != (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 (priv->bad_flow_control)
+			urb_value &= ~(BELKIN_SA_FLOW_IRTS);
+
+		if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
+			err("Set flow control error");
+	}
+} /* belkin_sa_set_termios */
+
+
+static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
+{
+	struct usb_serial *serial = port->serial;
+
+	if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
+		err("Set break_ctl %d", break_state);
+}
+
+
+static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
+{
+	struct usb_serial *serial = port->serial;
+	__u16 urb_value; /* Will hold the new flags */
+	struct belkin_sa_private *priv = (struct belkin_sa_private *)port->private;
+	int  ret, mask;
+	
+	/* Based on code from acm.c and others */
+	switch (cmd) {
+	case TIOCMGET:
+		return put_user(priv->control_state, (unsigned long *) arg);
+		break;
+
+	case TIOCMSET: /* Turns on and off the lines as specified by the mask */
+	case TIOCMBIS: /* turns on (Sets) the lines as specified by the mask */
+	case TIOCMBIC: /* turns off (Clears) the lines as specified by the mask */
+		if ((ret = get_user(mask, (unsigned long *) arg))) return ret;
+
+		if ((cmd == TIOCMSET) || (mask & TIOCM_RTS)) {
+			/* RTS needs set */
+			urb_value = ((cmd == TIOCMSET) && (mask & TIOCM_RTS)) || (cmd == TIOCMBIS) ? 1 : 0;
+			if (urb_value)
+				priv->control_state |= TIOCM_RTS;
+			else
+				priv->control_state &= ~TIOCM_RTS;
+
+			if ((ret = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, urb_value)) < 0) {
+				err("Set RTS error %d", ret);
+				return(ret);
+			}
+		}
+
+		if ((cmd == TIOCMSET) || (mask & TIOCM_DTR)) {
+			/* DTR needs set */
+			urb_value = ((cmd == TIOCMSET) && (mask & TIOCM_DTR)) || (cmd == TIOCMBIS) ? 1 : 0;
+			if (urb_value)
+				priv->control_state |= TIOCM_DTR;
+			else
+				priv->control_state &= ~TIOCM_DTR;
+			if ((ret = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, urb_value)) < 0) {
+				err("Set DTR error %d", ret);
+				return(ret);
+			}
+		}
+		break;
+					
+	case TIOCMIWAIT:
+		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
+		/* TODO */
+		return( 0 );
+
+	case TIOCGICOUNT:
+		/* return count of modemline transitions */
+		/* TODO */
+		return 0;
+
+	default:
+		dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
+		return(-ENOIOCTLCMD);
+		break;
+	}
+	return 0;
+} /* belkin_sa_ioctl */
+
+
+static int __init belkin_sa_init (void)
+{
+	usb_serial_register (&belkin_sa_device);
+	usb_serial_register (&belkin_old_device);
+	usb_serial_register (&peracom_device);
+	return 0;
+}
+
+
+static void __exit belkin_sa_exit (void)
+{
+	usb_serial_deregister (&belkin_sa_device);
+	usb_serial_deregister (&belkin_old_device);
+	usb_serial_deregister (&peracom_device);
+}
+
+
+module_init (belkin_sa_init);
+module_exit(belkin_sa_exit);
+
+MODULE_DESCRIPTION("USB Belkin Serial converter driver");