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|
/* -*- 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/smp_lock.h> /* cycle_kernel_lock() */
#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 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 int dtlk_ioctl(struct inode *inode, 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,
.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 ssize_t dtlk_read(struct file *file, char __user *buf,
size_t count, loff_t * ppos)
{
unsigned int minor = iminor(file->f_path.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_path.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
|