diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
new file mode 100644
index 0000000..903e4c3
--- /dev/null
+++ b/drivers/char/dtlk.c
@@ -0,0 +1,659 @@
+/*                                              -*- linux-c -*-
+ * dtlk.c - DoubleTalk PC driver for Linux
+ *
+ * Original author: Chris Pallotta <chris@allmedia.com>
+ * Current maintainer: Jim Van Zandt <jrv@vanzandt.mv.com>
+ * 
+ * 2000-03-18 Jim Van Zandt: Fix polling.
+ *  Eliminate dtlk_timer_active flag and separate dtlk_stop_timer
+ *  function.  Don't restart timer in dtlk_timer_tick.  Restart timer
+ *  in dtlk_poll after every poll.  dtlk_poll returns mask (duh).
+ *  Eliminate unused function dtlk_write_byte.  Misc. code cleanups.
+ */
+
+/* This driver is for the DoubleTalk PC, a speech synthesizer
+   manufactured by RC Systems (http://www.rcsys.com/).  It was written
+   based on documentation in their User's Manual file and Developer's
+   Tools disk.
+
+   The DoubleTalk PC contains four voice synthesizers: text-to-speech
+   (TTS), linear predictive coding (LPC), PCM/ADPCM, and CVSD.  It
+   also has a tone generator.  Output data for LPC are written to the
+   LPC port, and output data for the other modes are written to the
+   TTS port.
+
+   Two kinds of data can be read from the DoubleTalk: status
+   information (in response to the "\001?" interrogation command) is
+   read from the TTS port, and index markers (which mark the progress
+   of the speech) are read from the LPC port.  Not all models of the
+   DoubleTalk PC implement index markers.  Both the TTS and LPC ports
+   can also display status flags.
+
+   The DoubleTalk PC generates no interrupts.
+
+   These characteristics are mapped into the Unix stream I/O model as
+   follows:
+
+   "write" sends bytes to the TTS port.  It is the responsibility of
+   the user program to switch modes among TTS, PCM/ADPCM, and CVSD.
+   This driver was written for use with the text-to-speech
+   synthesizer.  If LPC output is needed some day, other minor device
+   numbers can be used to select among output modes.
+
+   "read" gets index markers from the LPC port.  If the device does
+   not implement index markers, the read will fail with error EINVAL.
+
+   Status information is available using the DTLK_INTERROGATE ioctl.
+
+ */
+
+#include <linux/module.h>
+
+#define KERNEL
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/mm.h>		/* for verify_area */
+#include <linux/errno.h>	/* for -EBUSY */
+#include <linux/ioport.h>	/* for request_region */
+#include <linux/delay.h>	/* for loops_per_jiffy */
+#include <asm/io.h>		/* for inb_p, outb_p, inb, outb, etc. */
+#include <asm/uaccess.h>	/* for get_user, etc. */
+#include <linux/wait.h>		/* for wait_queue */
+#include <linux/init.h>		/* for __init, module_{init,exit} */
+#include <linux/poll.h>		/* for POLLIN, etc. */
+#include <linux/dtlk.h>		/* local header file for DoubleTalk values */
+#include <linux/devfs_fs_kernel.h>
+#include <linux/smp_lock.h>
+
+#ifdef TRACING
+#define TRACE_TEXT(str) printk(str);
+#define TRACE_RET printk(")")
+#else				/* !TRACING */
+#define TRACE_TEXT(str) ((void) 0)
+#define TRACE_RET ((void) 0)
+#endif				/* TRACING */
+
+
+static int dtlk_major;
+static int dtlk_port_lpc;
+static int dtlk_port_tts;
+static int dtlk_busy;
+static int dtlk_has_indexing;
+static unsigned int dtlk_portlist[] =
+{0x25e, 0x29e, 0x2de, 0x31e, 0x35e, 0x39e, 0};
+static wait_queue_head_t dtlk_process_list;
+static struct timer_list dtlk_timer;
+
+/* prototypes for file_operations struct */
+static ssize_t dtlk_read(struct file *, char __user *,
+			 size_t nbytes, loff_t * ppos);
+static ssize_t dtlk_write(struct file *, const char __user *,
+			  size_t nbytes, loff_t * ppos);
+static unsigned int dtlk_poll(struct file *, poll_table *);
+static int dtlk_open(struct inode *, struct file *);
+static int dtlk_release(struct inode *, struct file *);
+static int dtlk_ioctl(struct inode *inode, struct file *file,
+		      unsigned int cmd, unsigned long arg);
+
+static struct file_operations dtlk_fops =
+{
+	.owner		= THIS_MODULE,
+	.read		= dtlk_read,
+	.write		= dtlk_write,
+	.poll		= dtlk_poll,
+	.ioctl		= dtlk_ioctl,
+	.open		= dtlk_open,
+	.release	= dtlk_release,
+};
+
+/* local prototypes */
+static int dtlk_dev_probe(void);
+static struct dtlk_settings *dtlk_interrogate(void);
+static int dtlk_readable(void);
+static char dtlk_read_lpc(void);
+static char dtlk_read_tts(void);
+static int dtlk_writeable(void);
+static char dtlk_write_bytes(const char *buf, int n);
+static char dtlk_write_tts(char);
+/*
+   static void dtlk_handle_error(char, char, unsigned int);
+ */
+static void dtlk_timer_tick(unsigned long data);
+
+static ssize_t dtlk_read(struct file *file, char __user *buf,
+			 size_t count, loff_t * ppos)
+{
+	unsigned int minor = iminor(file->f_dentry->d_inode);
+	char ch;
+	int i = 0, retries;
+
+	TRACE_TEXT("(dtlk_read");
+	/*  printk("DoubleTalk PC - dtlk_read()\n"); */
+
+	if (minor != DTLK_MINOR || !dtlk_has_indexing)
+		return -EINVAL;
+
+	for (retries = 0; retries < loops_per_jiffy; retries++) {
+		while (i < count && dtlk_readable()) {
+			ch = dtlk_read_lpc();
+			/*        printk("dtlk_read() reads 0x%02x\n", ch); */
+			if (put_user(ch, buf++))
+				return -EFAULT;
+			i++;
+		}
+		if (i)
+			return i;
+		if (file->f_flags & O_NONBLOCK)
+			break;
+		msleep_interruptible(100);
+	}
+	if (retries == loops_per_jiffy)
+		printk(KERN_ERR "dtlk_read times out\n");
+	TRACE_RET;
+	return -EAGAIN;
+}
+
+static ssize_t dtlk_write(struct file *file, const char __user *buf,
+			  size_t count, loff_t * ppos)
+{
+	int i = 0, retries = 0, ch;
+
+	TRACE_TEXT("(dtlk_write");
+#ifdef TRACING
+	printk(" \"");
+	{
+		int i, ch;
+		for (i = 0; i < count; i++) {
+			if (get_user(ch, buf + i))
+				return -EFAULT;
+			if (' ' <= ch && ch <= '~')
+				printk("%c", ch);
+			else
+				printk("\\%03o", ch);
+		}
+		printk("\"");
+	}
+#endif
+
+	if (iminor(file->f_dentry->d_inode) != DTLK_MINOR)
+		return -EINVAL;
+
+	while (1) {
+		while (i < count && !get_user(ch, buf) &&
+		       (ch == DTLK_CLEAR || dtlk_writeable())) {
+			dtlk_write_tts(ch);
+			buf++;
+			i++;
+			if (i % 5 == 0)
+				/* We yield our time until scheduled
+				   again.  This reduces the transfer
+				   rate to 500 bytes/sec, but that's
+				   still enough to keep up with the
+				   speech synthesizer. */
+				msleep_interruptible(1);
+			else {
+				/* the RDY bit goes zero 2-3 usec
+				   after writing, and goes 1 again
+				   180-190 usec later.  Here, we wait
+				   up to 250 usec for the RDY bit to
+				   go nonzero. */
+				for (retries = 0;
+				     retries < loops_per_jiffy / (4000/HZ);
+				     retries++)
+					if (inb_p(dtlk_port_tts) &
+					    TTS_WRITABLE)
+						break;
+			}
+			retries = 0;
+		}
+		if (i == count)
+			return i;
+		if (file->f_flags & O_NONBLOCK)
+			break;
+
+		msleep_interruptible(1);
+
+		if (++retries > 10 * HZ) { /* wait no more than 10 sec
+					      from last write */
+			printk("dtlk: write timeout.  "
+			       "inb_p(dtlk_port_tts) = 0x%02x\n",
+			       inb_p(dtlk_port_tts));
+			TRACE_RET;
+			return -EBUSY;
+		}
+	}
+	TRACE_RET;
+	return -EAGAIN;
+}
+
+static unsigned int dtlk_poll(struct file *file, poll_table * wait)
+{
+	int mask = 0;
+	unsigned long expires;
+
+	TRACE_TEXT(" dtlk_poll");
+	/*
+	   static long int j;
+	   printk(".");
+	   printk("<%ld>", jiffies-j);
+	   j=jiffies;
+	 */
+	poll_wait(file, &dtlk_process_list, wait);
+
+	if (dtlk_has_indexing && dtlk_readable()) {
+	        del_timer(&dtlk_timer);
+		mask = POLLIN | POLLRDNORM;
+	}
+	if (dtlk_writeable()) {
+	        del_timer(&dtlk_timer);
+		mask |= POLLOUT | POLLWRNORM;
+	}
+	/* there are no exception conditions */
+
+	/* There won't be any interrupts, so we set a timer instead. */
+	expires = jiffies + 3*HZ / 100;
+	mod_timer(&dtlk_timer, expires);
+
+	return mask;
+}
+
+static void dtlk_timer_tick(unsigned long data)
+{
+	TRACE_TEXT(" dtlk_timer_tick");
+	wake_up_interruptible(&dtlk_process_list);
+}
+
+static int dtlk_ioctl(struct inode *inode,
+		      struct file *file,
+		      unsigned int cmd,
+		      unsigned long arg)
+{
+	char __user *argp = (char __user *)arg;
+	struct dtlk_settings *sp;
+	char portval;
+	TRACE_TEXT(" dtlk_ioctl");
+
+	switch (cmd) {
+
+	case DTLK_INTERROGATE:
+		sp = dtlk_interrogate();
+		if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
+			return -EINVAL;
+		return 0;
+
+	case DTLK_STATUS:
+		portval = inb_p(dtlk_port_tts);
+		return put_user(portval, argp);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int dtlk_open(struct inode *inode, struct file *file)
+{
+	TRACE_TEXT("(dtlk_open");
+
+	nonseekable_open(inode, file);
+	switch (iminor(inode)) {
+	case DTLK_MINOR:
+		if (dtlk_busy)
+			return -EBUSY;
+		return nonseekable_open(inode, file);
+
+	default:
+		return -ENXIO;
+	}
+}
+
+static int dtlk_release(struct inode *inode, struct file *file)
+{
+	TRACE_TEXT("(dtlk_release");
+
+	switch (iminor(inode)) {
+	case DTLK_MINOR:
+		break;
+
+	default:
+		break;
+	}
+	TRACE_RET;
+	
+	del_timer(&dtlk_timer);
+
+	return 0;
+}
+
+static int __init dtlk_init(void)
+{
+	dtlk_port_lpc = 0;
+	dtlk_port_tts = 0;
+	dtlk_busy = 0;
+	dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops);
+	if (dtlk_major == 0) {
+		printk(KERN_ERR "DoubleTalk PC - cannot register device\n");
+		return 0;
+	}
+	if (dtlk_dev_probe() == 0)
+		printk(", MAJOR %d\n", dtlk_major);
+
+	devfs_mk_cdev(MKDEV(dtlk_major, DTLK_MINOR),
+		       S_IFCHR | S_IRUSR | S_IWUSR, "dtlk");
+
+	init_timer(&dtlk_timer);
+	dtlk_timer.function = dtlk_timer_tick;
+	init_waitqueue_head(&dtlk_process_list);
+
+	return 0;
+}
+
+static void __exit dtlk_cleanup (void)
+{
+	dtlk_write_bytes("goodbye", 8);
+	msleep_interruptible(500);		/* nap 0.50 sec but
+						   could be awakened
+						   earlier by
+						   signals... */
+
+	dtlk_write_tts(DTLK_CLEAR);
+	unregister_chrdev(dtlk_major, "dtlk");
+	devfs_remove("dtlk");
+	release_region(dtlk_port_lpc, DTLK_IO_EXTENT);
+}
+
+module_init(dtlk_init);
+module_exit(dtlk_cleanup);
+
+/* ------------------------------------------------------------------------ */
+
+static int dtlk_readable(void)
+{
+#ifdef TRACING
+	printk(" dtlk_readable=%u@%u", inb_p(dtlk_port_lpc) != 0x7f, jiffies);
+#endif
+	return inb_p(dtlk_port_lpc) != 0x7f;
+}
+
+static int dtlk_writeable(void)
+{
+	/* TRACE_TEXT(" dtlk_writeable"); */
+#ifdef TRACINGMORE
+	printk(" dtlk_writeable=%u", (inb_p(dtlk_port_tts) & TTS_WRITABLE)!=0);
+#endif
+	return inb_p(dtlk_port_tts) & TTS_WRITABLE;
+}
+
+static int __init dtlk_dev_probe(void)
+{
+	unsigned int testval = 0;
+	int i = 0;
+	struct dtlk_settings *sp;
+
+	if (dtlk_port_lpc | dtlk_port_tts)
+		return -EBUSY;
+
+	for (i = 0; dtlk_portlist[i]; i++) {
+#if 0
+		printk("DoubleTalk PC - Port %03x = %04x\n",
+		       dtlk_portlist[i], (testval = inw_p(dtlk_portlist[i])));
+#endif
+
+		if (!request_region(dtlk_portlist[i], DTLK_IO_EXTENT, 
+			       "dtlk"))
+			continue;
+		testval = inw_p(dtlk_portlist[i]);
+		if ((testval &= 0xfbff) == 0x107f) {
+			dtlk_port_lpc = dtlk_portlist[i];
+			dtlk_port_tts = dtlk_port_lpc + 1;
+
+			sp = dtlk_interrogate();
+			printk("DoubleTalk PC at %03x-%03x, "
+			       "ROM version %s, serial number %u",
+			       dtlk_portlist[i], dtlk_portlist[i] +
+			       DTLK_IO_EXTENT - 1,
+			       sp->rom_version, sp->serial_number);
+
+                        /* put LPC port into known state, so
+			   dtlk_readable() gives valid result */
+			outb_p(0xff, dtlk_port_lpc); 
+
+                        /* INIT string and index marker */
+			dtlk_write_bytes("\036\1@\0\0012I\r", 8);
+			/* posting an index takes 18 msec.  Here, we
+			   wait up to 100 msec to see whether it
+			   appears. */
+			msleep_interruptible(100);
+			dtlk_has_indexing = dtlk_readable();
+#ifdef TRACING
+			printk(", indexing %d\n", dtlk_has_indexing);
+#endif
+#ifdef INSCOPE
+			{
+/* This macro records ten samples read from the LPC port, for later display */
+#define LOOK					\
+for (i = 0; i < 10; i++)			\
+  {						\
+    buffer[b++] = inb_p(dtlk_port_lpc);		\
+    __delay(loops_per_jiffy/(1000000/HZ));             \
+  }
+				char buffer[1000];
+				int b = 0, i, j;
+
+				LOOK
+				outb_p(0xff, dtlk_port_lpc);
+				buffer[b++] = 0;
+				LOOK
+				dtlk_write_bytes("\0012I\r", 4);
+				buffer[b++] = 0;
+				__delay(50 * loops_per_jiffy / (1000/HZ));
+				outb_p(0xff, dtlk_port_lpc);
+				buffer[b++] = 0;
+				LOOK
+
+				printk("\n");
+				for (j = 0; j < b; j++)
+					printk(" %02x", buffer[j]);
+				printk("\n");
+			}
+#endif				/* INSCOPE */
+
+#ifdef OUTSCOPE
+			{
+/* This macro records ten samples read from the TTS port, for later display */
+#define LOOK					\
+for (i = 0; i < 10; i++)			\
+  {						\
+    buffer[b++] = inb_p(dtlk_port_tts);		\
+    __delay(loops_per_jiffy/(1000000/HZ));  /* 1 us */ \
+  }
+				char buffer[1000];
+				int b = 0, i, j;
+
+				mdelay(10);	/* 10 ms */
+				LOOK
+				outb_p(0x03, dtlk_port_tts);
+				buffer[b++] = 0;
+				LOOK
+				LOOK
+
+				printk("\n");
+				for (j = 0; j < b; j++)
+					printk(" %02x", buffer[j]);
+				printk("\n");
+			}
+#endif				/* OUTSCOPE */
+
+			dtlk_write_bytes("Double Talk found", 18);
+
+			return 0;
+		}
+		release_region(dtlk_portlist[i], DTLK_IO_EXTENT);
+	}
+
+	printk(KERN_INFO "\nDoubleTalk PC - not found\n");
+	return -ENODEV;
+}
+
+/*
+   static void dtlk_handle_error(char op, char rc, unsigned int minor)
+   {
+   printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n", 
+   minor, op, rc);
+   return;
+   }
+ */
+
+/* interrogate the DoubleTalk PC and return its settings */
+static struct dtlk_settings *dtlk_interrogate(void)
+{
+	unsigned char *t;
+	static char buf[sizeof(struct dtlk_settings) + 1];
+	int total, i;
+	static struct dtlk_settings status;
+	TRACE_TEXT("(dtlk_interrogate");
+	dtlk_write_bytes("\030\001?", 3);
+	for (total = 0, i = 0; i < 50; i++) {
+		buf[total] = dtlk_read_tts();
+		if (total > 2 && buf[total] == 0x7f)
+			break;
+		if (total < sizeof(struct dtlk_settings))
+			total++;
+	}
+	/*
+	   if (i==50) printk("interrogate() read overrun\n");
+	   for (i=0; i<sizeof(buf); i++)
+	   printk(" %02x", buf[i]);
+	   printk("\n");
+	 */
+	t = buf;
+	status.serial_number = t[0] + t[1] * 256; /* serial number is
+						     little endian */
+	t += 2;
+
+	i = 0;
+	while (*t != '\r') {
+		status.rom_version[i] = *t;
+		if (i < sizeof(status.rom_version) - 1)
+			i++;
+		t++;
+	}
+	status.rom_version[i] = 0;
+	t++;
+
+	status.mode = *t++;
+	status.punc_level = *t++;
+	status.formant_freq = *t++;
+	status.pitch = *t++;
+	status.speed = *t++;
+	status.volume = *t++;
+	status.tone = *t++;
+	status.expression = *t++;
+	status.ext_dict_loaded = *t++;
+	status.ext_dict_status = *t++;
+	status.free_ram = *t++;
+	status.articulation = *t++;
+	status.reverb = *t++;
+	status.eob = *t++;
+	status.has_indexing = dtlk_has_indexing;
+	TRACE_RET;
+	return &status;
+}
+
+static char dtlk_read_tts(void)
+{
+	int portval, retries = 0;
+	char ch;
+	TRACE_TEXT("(dtlk_read_tts");
+
+	/* verify DT is ready, read char, wait for ACK */
+	do {
+		portval = inb_p(dtlk_port_tts);
+	} while ((portval & TTS_READABLE) == 0 &&
+		 retries++ < DTLK_MAX_RETRIES);
+	if (retries == DTLK_MAX_RETRIES)
+		printk(KERN_ERR "dtlk_read_tts() timeout\n");
+
+	ch = inb_p(dtlk_port_tts);	/* input from TTS port */
+	ch &= 0x7f;
+	outb_p(ch, dtlk_port_tts);
+
+	retries = 0;
+	do {
+		portval = inb_p(dtlk_port_tts);
+	} while ((portval & TTS_READABLE) != 0 &&
+		 retries++ < DTLK_MAX_RETRIES);
+	if (retries == DTLK_MAX_RETRIES)
+		printk(KERN_ERR "dtlk_read_tts() timeout\n");
+
+	TRACE_RET;
+	return ch;
+}
+
+static char dtlk_read_lpc(void)
+{
+	int retries = 0;
+	char ch;
+	TRACE_TEXT("(dtlk_read_lpc");
+
+	/* no need to test -- this is only called when the port is readable */
+
+	ch = inb_p(dtlk_port_lpc);	/* input from LPC port */
+
+	outb_p(0xff, dtlk_port_lpc);
+
+	/* acknowledging a read takes 3-4
+	   usec.  Here, we wait up to 20 usec
+	   for the acknowledgement */
+	retries = (loops_per_jiffy * 20) / (1000000/HZ);
+	while (inb_p(dtlk_port_lpc) != 0x7f && --retries > 0);
+	if (retries == 0)
+		printk(KERN_ERR "dtlk_read_lpc() timeout\n");
+
+	TRACE_RET;
+	return ch;
+}
+
+/* write n bytes to tts port */
+static char dtlk_write_bytes(const char *buf, int n)
+{
+	char val = 0;
+	/*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */
+	TRACE_TEXT("(dtlk_write_bytes");
+	while (n-- > 0)
+		val = dtlk_write_tts(*buf++);
+	TRACE_RET;
+	return val;
+}
+
+static char dtlk_write_tts(char ch)
+{
+	int retries = 0;
+#ifdef TRACINGMORE
+	printk("  dtlk_write_tts(");
+	if (' ' <= ch && ch <= '~')
+		printk("'%c'", ch);
+	else
+		printk("0x%02x", ch);
+#endif
+	if (ch != DTLK_CLEAR)	/* no flow control for CLEAR command */
+		while ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0 &&
+		       retries++ < DTLK_MAX_RETRIES)	/* DT ready? */
+			;
+	if (retries == DTLK_MAX_RETRIES)
+		printk(KERN_ERR "dtlk_write_tts() timeout\n");
+
+	outb_p(ch, dtlk_port_tts);	/* output to TTS port */
+	/* the RDY bit goes zero 2-3 usec after writing, and goes
+	   1 again 180-190 usec later.  Here, we wait up to 10
+	   usec for the RDY bit to go zero. */
+	for (retries = 0; retries < loops_per_jiffy / (100000/HZ); retries++)
+		if ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0)
+			break;
+
+#ifdef TRACINGMORE
+	printk(")\n");
+#endif
+	return 0;
+}
+
+MODULE_LICENSE("GPL");