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path: root/drivers/char/dtlk.c
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-rw-r--r--drivers/char/dtlk.c663
1 files changed, 663 insertions, 0 deletions
diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
new file mode 100644
index 000000000..65a8d96c0
--- /dev/null
+++ b/drivers/char/dtlk.c
@@ -0,0 +1,663 @@
+/* -*- 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>
+#include <linux/errno.h> /* for -EBUSY */
+#include <linux/ioport.h> /* for request_region */
+#include <linux/delay.h> /* for loops_per_jiffy */
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#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 */
+
+#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 DEFINE_MUTEX(dtlk_mutex);
+static void dtlk_timer_tick(unsigned long data);
+
+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 DEFINE_TIMER(dtlk_timer, dtlk_timer_tick, 0, 0);
+
+/* 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 long dtlk_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg);
+
+static const struct file_operations dtlk_fops =
+{
+ .owner = THIS_MODULE,
+ .read = dtlk_read,
+ .write = dtlk_write,
+ .poll = dtlk_poll,
+ .unlocked_ioctl = dtlk_ioctl,
+ .open = dtlk_open,
+ .release = dtlk_release,
+ .llseek = no_llseek,
+};
+
+/* 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 ssize_t dtlk_read(struct file *file, char __user *buf,
+ size_t count, loff_t * ppos)
+{
+ unsigned int minor = iminor(file_inode(file));
+ 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_inode(file)) != 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 long dtlk_ioctl(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:
+ mutex_lock(&dtlk_mutex);
+ sp = dtlk_interrogate();
+ mutex_unlock(&dtlk_mutex);
+ 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;
+ }
+}
+
+/* Note that nobody ever sets dtlk_busy... */
+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_sync(&dtlk_timer);
+
+ return 0;
+}
+
+static int __init dtlk_init(void)
+{
+ int err;
+
+ 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 dtlk_major;
+ }
+ err = dtlk_dev_probe();
+ if (err) {
+ unregister_chrdev(dtlk_major, "dtlk");
+ return err;
+ }
+ printk(", MAJOR %d\n", dtlk_major);
+
+ 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");
+ 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 "DoubleTalk 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");
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