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663 lines
16 KiB
663 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* -*- linux-c -*- |
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* dtlk.c - DoubleTalk PC driver for Linux |
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* |
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* Original author: Chris Pallotta <[email protected]> |
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* Current maintainer: Jim Van Zandt <[email protected]> |
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* |
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* 2000-03-18 Jim Van Zandt: Fix polling. |
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* Eliminate dtlk_timer_active flag and separate dtlk_stop_timer |
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* function. Don't restart timer in dtlk_timer_tick. Restart timer |
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* in dtlk_poll after every poll. dtlk_poll returns mask (duh). |
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* Eliminate unused function dtlk_write_byte. Misc. code cleanups. |
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*/ |
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|
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/* This driver is for the DoubleTalk PC, a speech synthesizer |
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manufactured by RC Systems (http://www.rcsys.com/). It was written |
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based on documentation in their User's Manual file and Developer's |
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Tools disk. |
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|
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The DoubleTalk PC contains four voice synthesizers: text-to-speech |
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(TTS), linear predictive coding (LPC), PCM/ADPCM, and CVSD. It |
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also has a tone generator. Output data for LPC are written to the |
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LPC port, and output data for the other modes are written to the |
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TTS port. |
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|
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Two kinds of data can be read from the DoubleTalk: status |
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information (in response to the "\001?" interrogation command) is |
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read from the TTS port, and index markers (which mark the progress |
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of the speech) are read from the LPC port. Not all models of the |
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DoubleTalk PC implement index markers. Both the TTS and LPC ports |
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can also display status flags. |
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|
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The DoubleTalk PC generates no interrupts. |
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|
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These characteristics are mapped into the Unix stream I/O model as |
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follows: |
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|
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"write" sends bytes to the TTS port. It is the responsibility of |
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the user program to switch modes among TTS, PCM/ADPCM, and CVSD. |
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This driver was written for use with the text-to-speech |
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synthesizer. If LPC output is needed some day, other minor device |
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numbers can be used to select among output modes. |
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|
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"read" gets index markers from the LPC port. If the device does |
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not implement index markers, the read will fail with error EINVAL. |
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|
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Status information is available using the DTLK_INTERROGATE ioctl. |
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|
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*/ |
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|
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#include <linux/module.h> |
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|
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#define KERNEL |
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#include <linux/types.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/errno.h> /* for -EBUSY */ |
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#include <linux/ioport.h> /* for request_region */ |
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#include <linux/delay.h> /* for loops_per_jiffy */ |
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#include <linux/sched.h> |
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#include <linux/mutex.h> |
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#include <asm/io.h> /* for inb_p, outb_p, inb, outb, etc. */ |
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#include <linux/uaccess.h> /* for get_user, etc. */ |
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#include <linux/wait.h> /* for wait_queue */ |
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#include <linux/init.h> /* for __init, module_{init,exit} */ |
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#include <linux/poll.h> /* for EPOLLIN, etc. */ |
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#include <linux/dtlk.h> /* local header file for DoubleTalk values */ |
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|
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#ifdef TRACING |
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#define TRACE_TEXT(str) printk(str); |
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#define TRACE_RET printk(")") |
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#else /* !TRACING */ |
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#define TRACE_TEXT(str) ((void) 0) |
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#define TRACE_RET ((void) 0) |
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#endif /* TRACING */ |
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|
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static DEFINE_MUTEX(dtlk_mutex); |
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static void dtlk_timer_tick(struct timer_list *unused); |
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|
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static int dtlk_major; |
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static int dtlk_port_lpc; |
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static int dtlk_port_tts; |
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static int dtlk_busy; |
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static int dtlk_has_indexing; |
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static unsigned int dtlk_portlist[] = |
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{0x25e, 0x29e, 0x2de, 0x31e, 0x35e, 0x39e, 0}; |
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static wait_queue_head_t dtlk_process_list; |
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static DEFINE_TIMER(dtlk_timer, dtlk_timer_tick); |
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|
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/* prototypes for file_operations struct */ |
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static ssize_t dtlk_read(struct file *, char __user *, |
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size_t nbytes, loff_t * ppos); |
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static ssize_t dtlk_write(struct file *, const char __user *, |
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size_t nbytes, loff_t * ppos); |
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static __poll_t dtlk_poll(struct file *, poll_table *); |
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static int dtlk_open(struct inode *, struct file *); |
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static int dtlk_release(struct inode *, struct file *); |
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static long dtlk_ioctl(struct file *file, |
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unsigned int cmd, unsigned long arg); |
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|
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static const struct file_operations dtlk_fops = |
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{ |
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.owner = THIS_MODULE, |
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.read = dtlk_read, |
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.write = dtlk_write, |
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.poll = dtlk_poll, |
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.unlocked_ioctl = dtlk_ioctl, |
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.open = dtlk_open, |
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.release = dtlk_release, |
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.llseek = no_llseek, |
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}; |
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|
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/* local prototypes */ |
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static int dtlk_dev_probe(void); |
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static struct dtlk_settings *dtlk_interrogate(void); |
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static int dtlk_readable(void); |
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static char dtlk_read_lpc(void); |
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static char dtlk_read_tts(void); |
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static int dtlk_writeable(void); |
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static char dtlk_write_bytes(const char *buf, int n); |
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static char dtlk_write_tts(char); |
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/* |
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static void dtlk_handle_error(char, char, unsigned int); |
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*/ |
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static ssize_t dtlk_read(struct file *file, char __user *buf, |
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size_t count, loff_t * ppos) |
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{ |
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unsigned int minor = iminor(file_inode(file)); |
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char ch; |
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int i = 0, retries; |
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|
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TRACE_TEXT("(dtlk_read"); |
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/* printk("DoubleTalk PC - dtlk_read()\n"); */ |
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if (minor != DTLK_MINOR || !dtlk_has_indexing) |
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return -EINVAL; |
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for (retries = 0; retries < loops_per_jiffy; retries++) { |
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while (i < count && dtlk_readable()) { |
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ch = dtlk_read_lpc(); |
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/* printk("dtlk_read() reads 0x%02x\n", ch); */ |
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if (put_user(ch, buf++)) |
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return -EFAULT; |
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i++; |
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} |
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if (i) |
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return i; |
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if (file->f_flags & O_NONBLOCK) |
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break; |
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msleep_interruptible(100); |
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} |
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if (retries == loops_per_jiffy) |
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printk(KERN_ERR "dtlk_read times out\n"); |
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TRACE_RET; |
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return -EAGAIN; |
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} |
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static ssize_t dtlk_write(struct file *file, const char __user *buf, |
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size_t count, loff_t * ppos) |
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{ |
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int i = 0, retries = 0, ch; |
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TRACE_TEXT("(dtlk_write"); |
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#ifdef TRACING |
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printk(" \""); |
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{ |
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int i, ch; |
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for (i = 0; i < count; i++) { |
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if (get_user(ch, buf + i)) |
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return -EFAULT; |
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if (' ' <= ch && ch <= '~') |
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printk("%c", ch); |
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else |
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printk("\\%03o", ch); |
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} |
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printk("\""); |
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} |
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#endif |
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if (iminor(file_inode(file)) != DTLK_MINOR) |
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return -EINVAL; |
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while (1) { |
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while (i < count && !get_user(ch, buf) && |
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(ch == DTLK_CLEAR || dtlk_writeable())) { |
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dtlk_write_tts(ch); |
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buf++; |
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i++; |
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if (i % 5 == 0) |
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/* We yield our time until scheduled |
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again. This reduces the transfer |
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rate to 500 bytes/sec, but that's |
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still enough to keep up with the |
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speech synthesizer. */ |
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msleep_interruptible(1); |
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else { |
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/* the RDY bit goes zero 2-3 usec |
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after writing, and goes 1 again |
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180-190 usec later. Here, we wait |
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up to 250 usec for the RDY bit to |
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go nonzero. */ |
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for (retries = 0; |
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retries < loops_per_jiffy / (4000/HZ); |
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retries++) |
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if (inb_p(dtlk_port_tts) & |
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TTS_WRITABLE) |
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break; |
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} |
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retries = 0; |
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} |
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if (i == count) |
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return i; |
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if (file->f_flags & O_NONBLOCK) |
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break; |
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msleep_interruptible(1); |
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if (++retries > 10 * HZ) { /* wait no more than 10 sec |
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from last write */ |
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printk("dtlk: write timeout. " |
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"inb_p(dtlk_port_tts) = 0x%02x\n", |
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inb_p(dtlk_port_tts)); |
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TRACE_RET; |
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return -EBUSY; |
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} |
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} |
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TRACE_RET; |
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return -EAGAIN; |
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} |
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static __poll_t dtlk_poll(struct file *file, poll_table * wait) |
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{ |
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__poll_t mask = 0; |
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unsigned long expires; |
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TRACE_TEXT(" dtlk_poll"); |
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/* |
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static long int j; |
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printk("."); |
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printk("<%ld>", jiffies-j); |
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j=jiffies; |
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*/ |
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poll_wait(file, &dtlk_process_list, wait); |
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if (dtlk_has_indexing && dtlk_readable()) { |
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del_timer(&dtlk_timer); |
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mask = EPOLLIN | EPOLLRDNORM; |
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} |
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if (dtlk_writeable()) { |
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del_timer(&dtlk_timer); |
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mask |= EPOLLOUT | EPOLLWRNORM; |
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} |
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/* there are no exception conditions */ |
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/* There won't be any interrupts, so we set a timer instead. */ |
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expires = jiffies + 3*HZ / 100; |
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mod_timer(&dtlk_timer, expires); |
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return mask; |
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} |
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static void dtlk_timer_tick(struct timer_list *unused) |
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{ |
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TRACE_TEXT(" dtlk_timer_tick"); |
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wake_up_interruptible(&dtlk_process_list); |
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} |
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static long dtlk_ioctl(struct file *file, |
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unsigned int cmd, |
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unsigned long arg) |
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{ |
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char __user *argp = (char __user *)arg; |
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struct dtlk_settings *sp; |
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char portval; |
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TRACE_TEXT(" dtlk_ioctl"); |
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switch (cmd) { |
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case DTLK_INTERROGATE: |
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mutex_lock(&dtlk_mutex); |
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sp = dtlk_interrogate(); |
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mutex_unlock(&dtlk_mutex); |
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if (copy_to_user(argp, sp, sizeof(struct dtlk_settings))) |
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return -EINVAL; |
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return 0; |
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case DTLK_STATUS: |
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portval = inb_p(dtlk_port_tts); |
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return put_user(portval, argp); |
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default: |
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return -EINVAL; |
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} |
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} |
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/* Note that nobody ever sets dtlk_busy... */ |
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static int dtlk_open(struct inode *inode, struct file *file) |
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{ |
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TRACE_TEXT("(dtlk_open"); |
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switch (iminor(inode)) { |
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case DTLK_MINOR: |
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if (dtlk_busy) |
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return -EBUSY; |
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return stream_open(inode, file); |
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default: |
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return -ENXIO; |
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} |
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} |
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static int dtlk_release(struct inode *inode, struct file *file) |
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{ |
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TRACE_TEXT("(dtlk_release"); |
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switch (iminor(inode)) { |
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case DTLK_MINOR: |
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break; |
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default: |
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break; |
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} |
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TRACE_RET; |
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del_timer_sync(&dtlk_timer); |
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return 0; |
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} |
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static int __init dtlk_init(void) |
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{ |
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int err; |
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dtlk_port_lpc = 0; |
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dtlk_port_tts = 0; |
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dtlk_busy = 0; |
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dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops); |
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if (dtlk_major < 0) { |
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printk(KERN_ERR "DoubleTalk PC - cannot register device\n"); |
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return dtlk_major; |
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} |
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err = dtlk_dev_probe(); |
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if (err) { |
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unregister_chrdev(dtlk_major, "dtlk"); |
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return err; |
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} |
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printk(", MAJOR %d\n", dtlk_major); |
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init_waitqueue_head(&dtlk_process_list); |
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return 0; |
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} |
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static void __exit dtlk_cleanup (void) |
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{ |
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dtlk_write_bytes("goodbye", 8); |
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msleep_interruptible(500); /* nap 0.50 sec but |
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could be awakened |
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earlier by |
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signals... */ |
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dtlk_write_tts(DTLK_CLEAR); |
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unregister_chrdev(dtlk_major, "dtlk"); |
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release_region(dtlk_port_lpc, DTLK_IO_EXTENT); |
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} |
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module_init(dtlk_init); |
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module_exit(dtlk_cleanup); |
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/* ------------------------------------------------------------------------ */ |
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static int dtlk_readable(void) |
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{ |
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#ifdef TRACING |
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printk(" dtlk_readable=%u@%u", inb_p(dtlk_port_lpc) != 0x7f, jiffies); |
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#endif |
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return inb_p(dtlk_port_lpc) != 0x7f; |
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} |
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static int dtlk_writeable(void) |
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{ |
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/* TRACE_TEXT(" dtlk_writeable"); */ |
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#ifdef TRACINGMORE |
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printk(" dtlk_writeable=%u", (inb_p(dtlk_port_tts) & TTS_WRITABLE)!=0); |
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#endif |
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return inb_p(dtlk_port_tts) & TTS_WRITABLE; |
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} |
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static int __init dtlk_dev_probe(void) |
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{ |
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unsigned int testval = 0; |
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int i = 0; |
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struct dtlk_settings *sp; |
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if (dtlk_port_lpc | dtlk_port_tts) |
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return -EBUSY; |
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for (i = 0; dtlk_portlist[i]; i++) { |
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#if 0 |
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printk("DoubleTalk PC - Port %03x = %04x\n", |
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dtlk_portlist[i], (testval = inw_p(dtlk_portlist[i]))); |
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#endif |
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if (!request_region(dtlk_portlist[i], DTLK_IO_EXTENT, |
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"dtlk")) |
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continue; |
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testval = inw_p(dtlk_portlist[i]); |
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if ((testval &= 0xfbff) == 0x107f) { |
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dtlk_port_lpc = dtlk_portlist[i]; |
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dtlk_port_tts = dtlk_port_lpc + 1; |
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sp = dtlk_interrogate(); |
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printk("DoubleTalk PC at %03x-%03x, " |
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"ROM version %s, serial number %u", |
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dtlk_portlist[i], dtlk_portlist[i] + |
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DTLK_IO_EXTENT - 1, |
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sp->rom_version, sp->serial_number); |
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|
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/* put LPC port into known state, so |
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dtlk_readable() gives valid result */ |
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outb_p(0xff, dtlk_port_lpc); |
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|
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/* INIT string and index marker */ |
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dtlk_write_bytes("\036\1@\0\0012I\r", 8); |
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/* posting an index takes 18 msec. Here, we |
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wait up to 100 msec to see whether it |
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appears. */ |
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msleep_interruptible(100); |
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dtlk_has_indexing = dtlk_readable(); |
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#ifdef TRACING |
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printk(", indexing %d\n", dtlk_has_indexing); |
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#endif |
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#ifdef INSCOPE |
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{ |
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/* This macro records ten samples read from the LPC port, for later display */ |
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#define LOOK \ |
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for (i = 0; i < 10; i++) \ |
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{ \ |
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buffer[b++] = inb_p(dtlk_port_lpc); \ |
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__delay(loops_per_jiffy/(1000000/HZ)); \ |
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} |
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char buffer[1000]; |
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int b = 0, i, j; |
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|
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LOOK |
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outb_p(0xff, dtlk_port_lpc); |
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buffer[b++] = 0; |
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LOOK |
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dtlk_write_bytes("\0012I\r", 4); |
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buffer[b++] = 0; |
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__delay(50 * loops_per_jiffy / (1000/HZ)); |
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outb_p(0xff, dtlk_port_lpc); |
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buffer[b++] = 0; |
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LOOK |
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printk("\n"); |
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for (j = 0; j < b; j++) |
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printk(" %02x", buffer[j]); |
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printk("\n"); |
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} |
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#endif /* INSCOPE */ |
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|
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#ifdef OUTSCOPE |
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{ |
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/* This macro records ten samples read from the TTS port, for later display */ |
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#define LOOK \ |
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for (i = 0; i < 10; i++) \ |
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{ \ |
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buffer[b++] = inb_p(dtlk_port_tts); \ |
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__delay(loops_per_jiffy/(1000000/HZ)); /* 1 us */ \ |
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} |
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char buffer[1000]; |
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int b = 0, i, j; |
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mdelay(10); /* 10 ms */ |
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LOOK |
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outb_p(0x03, dtlk_port_tts); |
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buffer[b++] = 0; |
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LOOK |
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LOOK |
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printk("\n"); |
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for (j = 0; j < b; j++) |
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printk(" %02x", buffer[j]); |
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printk("\n"); |
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} |
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#endif /* OUTSCOPE */ |
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dtlk_write_bytes("Double Talk found", 18); |
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return 0; |
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} |
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release_region(dtlk_portlist[i], DTLK_IO_EXTENT); |
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} |
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printk(KERN_INFO "DoubleTalk PC - not found\n"); |
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return -ENODEV; |
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} |
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/* |
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static void dtlk_handle_error(char op, char rc, unsigned int minor) |
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{ |
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printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n", |
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minor, op, rc); |
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return; |
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} |
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*/ |
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|
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/* interrogate the DoubleTalk PC and return its settings */ |
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static struct dtlk_settings *dtlk_interrogate(void) |
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{ |
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unsigned char *t; |
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static char buf[sizeof(struct dtlk_settings) + 1]; |
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int total, i; |
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static struct dtlk_settings status; |
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TRACE_TEXT("(dtlk_interrogate"); |
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dtlk_write_bytes("\030\001?", 3); |
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for (total = 0, i = 0; i < 50; i++) { |
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buf[total] = dtlk_read_tts(); |
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if (total > 2 && buf[total] == 0x7f) |
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break; |
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if (total < sizeof(struct dtlk_settings)) |
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total++; |
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} |
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/* |
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if (i==50) printk("interrogate() read overrun\n"); |
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for (i=0; i<sizeof(buf); i++) |
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printk(" %02x", buf[i]); |
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printk("\n"); |
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*/ |
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t = buf; |
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status.serial_number = t[0] + t[1] * 256; /* serial number is |
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little endian */ |
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t += 2; |
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|
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i = 0; |
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while (*t != '\r') { |
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status.rom_version[i] = *t; |
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if (i < sizeof(status.rom_version) - 1) |
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i++; |
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t++; |
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} |
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status.rom_version[i] = 0; |
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t++; |
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|
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status.mode = *t++; |
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status.punc_level = *t++; |
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status.formant_freq = *t++; |
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status.pitch = *t++; |
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status.speed = *t++; |
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status.volume = *t++; |
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status.tone = *t++; |
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status.expression = *t++; |
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status.ext_dict_loaded = *t++; |
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status.ext_dict_status = *t++; |
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status.free_ram = *t++; |
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status.articulation = *t++; |
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status.reverb = *t++; |
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status.eob = *t++; |
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status.has_indexing = dtlk_has_indexing; |
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TRACE_RET; |
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return &status; |
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} |
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|
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static char dtlk_read_tts(void) |
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{ |
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int portval, retries = 0; |
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char ch; |
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TRACE_TEXT("(dtlk_read_tts"); |
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|
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/* verify DT is ready, read char, wait for ACK */ |
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do { |
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portval = inb_p(dtlk_port_tts); |
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} while ((portval & TTS_READABLE) == 0 && |
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retries++ < DTLK_MAX_RETRIES); |
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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");
|
|
|