usb-skeleton: small update
[linux-2.6] / drivers / char / dtlk.c
1 /*                                              -*- linux-c -*-
2  * dtlk.c - DoubleTalk PC driver for Linux
3  *
4  * Original author: Chris Pallotta <chris@allmedia.com>
5  * Current maintainer: Jim Van Zandt <jrv@vanzandt.mv.com>
6  * 
7  * 2000-03-18 Jim Van Zandt: Fix polling.
8  *  Eliminate dtlk_timer_active flag and separate dtlk_stop_timer
9  *  function.  Don't restart timer in dtlk_timer_tick.  Restart timer
10  *  in dtlk_poll after every poll.  dtlk_poll returns mask (duh).
11  *  Eliminate unused function dtlk_write_byte.  Misc. code cleanups.
12  */
13
14 /* This driver is for the DoubleTalk PC, a speech synthesizer
15    manufactured by RC Systems (http://www.rcsys.com/).  It was written
16    based on documentation in their User's Manual file and Developer's
17    Tools disk.
18
19    The DoubleTalk PC contains four voice synthesizers: text-to-speech
20    (TTS), linear predictive coding (LPC), PCM/ADPCM, and CVSD.  It
21    also has a tone generator.  Output data for LPC are written to the
22    LPC port, and output data for the other modes are written to the
23    TTS port.
24
25    Two kinds of data can be read from the DoubleTalk: status
26    information (in response to the "\001?" interrogation command) is
27    read from the TTS port, and index markers (which mark the progress
28    of the speech) are read from the LPC port.  Not all models of the
29    DoubleTalk PC implement index markers.  Both the TTS and LPC ports
30    can also display status flags.
31
32    The DoubleTalk PC generates no interrupts.
33
34    These characteristics are mapped into the Unix stream I/O model as
35    follows:
36
37    "write" sends bytes to the TTS port.  It is the responsibility of
38    the user program to switch modes among TTS, PCM/ADPCM, and CVSD.
39    This driver was written for use with the text-to-speech
40    synthesizer.  If LPC output is needed some day, other minor device
41    numbers can be used to select among output modes.
42
43    "read" gets index markers from the LPC port.  If the device does
44    not implement index markers, the read will fail with error EINVAL.
45
46    Status information is available using the DTLK_INTERROGATE ioctl.
47
48  */
49
50 #include <linux/module.h>
51
52 #define KERNEL
53 #include <linux/types.h>
54 #include <linux/fs.h>
55 #include <linux/mm.h>
56 #include <linux/errno.h>        /* for -EBUSY */
57 #include <linux/ioport.h>       /* for request_region */
58 #include <linux/delay.h>        /* for loops_per_jiffy */
59 #include <asm/io.h>             /* for inb_p, outb_p, inb, outb, etc. */
60 #include <asm/uaccess.h>        /* for get_user, etc. */
61 #include <linux/wait.h>         /* for wait_queue */
62 #include <linux/init.h>         /* for __init, module_{init,exit} */
63 #include <linux/poll.h>         /* for POLLIN, etc. */
64 #include <linux/dtlk.h>         /* local header file for DoubleTalk values */
65 #include <linux/smp_lock.h>
66
67 #ifdef TRACING
68 #define TRACE_TEXT(str) printk(str);
69 #define TRACE_RET printk(")")
70 #else                           /* !TRACING */
71 #define TRACE_TEXT(str) ((void) 0)
72 #define TRACE_RET ((void) 0)
73 #endif                          /* TRACING */
74
75
76 static int dtlk_major;
77 static int dtlk_port_lpc;
78 static int dtlk_port_tts;
79 static int dtlk_busy;
80 static int dtlk_has_indexing;
81 static unsigned int dtlk_portlist[] =
82 {0x25e, 0x29e, 0x2de, 0x31e, 0x35e, 0x39e, 0};
83 static wait_queue_head_t dtlk_process_list;
84 static struct timer_list dtlk_timer;
85
86 /* prototypes for file_operations struct */
87 static ssize_t dtlk_read(struct file *, char __user *,
88                          size_t nbytes, loff_t * ppos);
89 static ssize_t dtlk_write(struct file *, const char __user *,
90                           size_t nbytes, loff_t * ppos);
91 static unsigned int dtlk_poll(struct file *, poll_table *);
92 static int dtlk_open(struct inode *, struct file *);
93 static int dtlk_release(struct inode *, struct file *);
94 static int dtlk_ioctl(struct inode *inode, struct file *file,
95                       unsigned int cmd, unsigned long arg);
96
97 static const struct file_operations dtlk_fops =
98 {
99         .owner          = THIS_MODULE,
100         .read           = dtlk_read,
101         .write          = dtlk_write,
102         .poll           = dtlk_poll,
103         .ioctl          = dtlk_ioctl,
104         .open           = dtlk_open,
105         .release        = dtlk_release,
106 };
107
108 /* local prototypes */
109 static int dtlk_dev_probe(void);
110 static struct dtlk_settings *dtlk_interrogate(void);
111 static int dtlk_readable(void);
112 static char dtlk_read_lpc(void);
113 static char dtlk_read_tts(void);
114 static int dtlk_writeable(void);
115 static char dtlk_write_bytes(const char *buf, int n);
116 static char dtlk_write_tts(char);
117 /*
118    static void dtlk_handle_error(char, char, unsigned int);
119  */
120 static void dtlk_timer_tick(unsigned long data);
121
122 static ssize_t dtlk_read(struct file *file, char __user *buf,
123                          size_t count, loff_t * ppos)
124 {
125         unsigned int minor = iminor(file->f_dentry->d_inode);
126         char ch;
127         int i = 0, retries;
128
129         TRACE_TEXT("(dtlk_read");
130         /*  printk("DoubleTalk PC - dtlk_read()\n"); */
131
132         if (minor != DTLK_MINOR || !dtlk_has_indexing)
133                 return -EINVAL;
134
135         for (retries = 0; retries < loops_per_jiffy; retries++) {
136                 while (i < count && dtlk_readable()) {
137                         ch = dtlk_read_lpc();
138                         /*        printk("dtlk_read() reads 0x%02x\n", ch); */
139                         if (put_user(ch, buf++))
140                                 return -EFAULT;
141                         i++;
142                 }
143                 if (i)
144                         return i;
145                 if (file->f_flags & O_NONBLOCK)
146                         break;
147                 msleep_interruptible(100);
148         }
149         if (retries == loops_per_jiffy)
150                 printk(KERN_ERR "dtlk_read times out\n");
151         TRACE_RET;
152         return -EAGAIN;
153 }
154
155 static ssize_t dtlk_write(struct file *file, const char __user *buf,
156                           size_t count, loff_t * ppos)
157 {
158         int i = 0, retries = 0, ch;
159
160         TRACE_TEXT("(dtlk_write");
161 #ifdef TRACING
162         printk(" \"");
163         {
164                 int i, ch;
165                 for (i = 0; i < count; i++) {
166                         if (get_user(ch, buf + i))
167                                 return -EFAULT;
168                         if (' ' <= ch && ch <= '~')
169                                 printk("%c", ch);
170                         else
171                                 printk("\\%03o", ch);
172                 }
173                 printk("\"");
174         }
175 #endif
176
177         if (iminor(file->f_dentry->d_inode) != DTLK_MINOR)
178                 return -EINVAL;
179
180         while (1) {
181                 while (i < count && !get_user(ch, buf) &&
182                        (ch == DTLK_CLEAR || dtlk_writeable())) {
183                         dtlk_write_tts(ch);
184                         buf++;
185                         i++;
186                         if (i % 5 == 0)
187                                 /* We yield our time until scheduled
188                                    again.  This reduces the transfer
189                                    rate to 500 bytes/sec, but that's
190                                    still enough to keep up with the
191                                    speech synthesizer. */
192                                 msleep_interruptible(1);
193                         else {
194                                 /* the RDY bit goes zero 2-3 usec
195                                    after writing, and goes 1 again
196                                    180-190 usec later.  Here, we wait
197                                    up to 250 usec for the RDY bit to
198                                    go nonzero. */
199                                 for (retries = 0;
200                                      retries < loops_per_jiffy / (4000/HZ);
201                                      retries++)
202                                         if (inb_p(dtlk_port_tts) &
203                                             TTS_WRITABLE)
204                                                 break;
205                         }
206                         retries = 0;
207                 }
208                 if (i == count)
209                         return i;
210                 if (file->f_flags & O_NONBLOCK)
211                         break;
212
213                 msleep_interruptible(1);
214
215                 if (++retries > 10 * HZ) { /* wait no more than 10 sec
216                                               from last write */
217                         printk("dtlk: write timeout.  "
218                                "inb_p(dtlk_port_tts) = 0x%02x\n",
219                                inb_p(dtlk_port_tts));
220                         TRACE_RET;
221                         return -EBUSY;
222                 }
223         }
224         TRACE_RET;
225         return -EAGAIN;
226 }
227
228 static unsigned int dtlk_poll(struct file *file, poll_table * wait)
229 {
230         int mask = 0;
231         unsigned long expires;
232
233         TRACE_TEXT(" dtlk_poll");
234         /*
235            static long int j;
236            printk(".");
237            printk("<%ld>", jiffies-j);
238            j=jiffies;
239          */
240         poll_wait(file, &dtlk_process_list, wait);
241
242         if (dtlk_has_indexing && dtlk_readable()) {
243                 del_timer(&dtlk_timer);
244                 mask = POLLIN | POLLRDNORM;
245         }
246         if (dtlk_writeable()) {
247                 del_timer(&dtlk_timer);
248                 mask |= POLLOUT | POLLWRNORM;
249         }
250         /* there are no exception conditions */
251
252         /* There won't be any interrupts, so we set a timer instead. */
253         expires = jiffies + 3*HZ / 100;
254         mod_timer(&dtlk_timer, expires);
255
256         return mask;
257 }
258
259 static void dtlk_timer_tick(unsigned long data)
260 {
261         TRACE_TEXT(" dtlk_timer_tick");
262         wake_up_interruptible(&dtlk_process_list);
263 }
264
265 static int dtlk_ioctl(struct inode *inode,
266                       struct file *file,
267                       unsigned int cmd,
268                       unsigned long arg)
269 {
270         char __user *argp = (char __user *)arg;
271         struct dtlk_settings *sp;
272         char portval;
273         TRACE_TEXT(" dtlk_ioctl");
274
275         switch (cmd) {
276
277         case DTLK_INTERROGATE:
278                 sp = dtlk_interrogate();
279                 if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
280                         return -EINVAL;
281                 return 0;
282
283         case DTLK_STATUS:
284                 portval = inb_p(dtlk_port_tts);
285                 return put_user(portval, argp);
286
287         default:
288                 return -EINVAL;
289         }
290 }
291
292 static int dtlk_open(struct inode *inode, struct file *file)
293 {
294         TRACE_TEXT("(dtlk_open");
295
296         nonseekable_open(inode, file);
297         switch (iminor(inode)) {
298         case DTLK_MINOR:
299                 if (dtlk_busy)
300                         return -EBUSY;
301                 return nonseekable_open(inode, file);
302
303         default:
304                 return -ENXIO;
305         }
306 }
307
308 static int dtlk_release(struct inode *inode, struct file *file)
309 {
310         TRACE_TEXT("(dtlk_release");
311
312         switch (iminor(inode)) {
313         case DTLK_MINOR:
314                 break;
315
316         default:
317                 break;
318         }
319         TRACE_RET;
320         
321         del_timer(&dtlk_timer);
322
323         return 0;
324 }
325
326 static int __init dtlk_init(void)
327 {
328         dtlk_port_lpc = 0;
329         dtlk_port_tts = 0;
330         dtlk_busy = 0;
331         dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops);
332         if (dtlk_major == 0) {
333                 printk(KERN_ERR "DoubleTalk PC - cannot register device\n");
334                 return 0;
335         }
336         if (dtlk_dev_probe() == 0)
337                 printk(", MAJOR %d\n", dtlk_major);
338
339         init_timer(&dtlk_timer);
340         dtlk_timer.function = dtlk_timer_tick;
341         init_waitqueue_head(&dtlk_process_list);
342
343         return 0;
344 }
345
346 static void __exit dtlk_cleanup (void)
347 {
348         dtlk_write_bytes("goodbye", 8);
349         msleep_interruptible(500);              /* nap 0.50 sec but
350                                                    could be awakened
351                                                    earlier by
352                                                    signals... */
353
354         dtlk_write_tts(DTLK_CLEAR);
355         unregister_chrdev(dtlk_major, "dtlk");
356         release_region(dtlk_port_lpc, DTLK_IO_EXTENT);
357 }
358
359 module_init(dtlk_init);
360 module_exit(dtlk_cleanup);
361
362 /* ------------------------------------------------------------------------ */
363
364 static int dtlk_readable(void)
365 {
366 #ifdef TRACING
367         printk(" dtlk_readable=%u@%u", inb_p(dtlk_port_lpc) != 0x7f, jiffies);
368 #endif
369         return inb_p(dtlk_port_lpc) != 0x7f;
370 }
371
372 static int dtlk_writeable(void)
373 {
374         /* TRACE_TEXT(" dtlk_writeable"); */
375 #ifdef TRACINGMORE
376         printk(" dtlk_writeable=%u", (inb_p(dtlk_port_tts) & TTS_WRITABLE)!=0);
377 #endif
378         return inb_p(dtlk_port_tts) & TTS_WRITABLE;
379 }
380
381 static int __init dtlk_dev_probe(void)
382 {
383         unsigned int testval = 0;
384         int i = 0;
385         struct dtlk_settings *sp;
386
387         if (dtlk_port_lpc | dtlk_port_tts)
388                 return -EBUSY;
389
390         for (i = 0; dtlk_portlist[i]; i++) {
391 #if 0
392                 printk("DoubleTalk PC - Port %03x = %04x\n",
393                        dtlk_portlist[i], (testval = inw_p(dtlk_portlist[i])));
394 #endif
395
396                 if (!request_region(dtlk_portlist[i], DTLK_IO_EXTENT, 
397                                "dtlk"))
398                         continue;
399                 testval = inw_p(dtlk_portlist[i]);
400                 if ((testval &= 0xfbff) == 0x107f) {
401                         dtlk_port_lpc = dtlk_portlist[i];
402                         dtlk_port_tts = dtlk_port_lpc + 1;
403
404                         sp = dtlk_interrogate();
405                         printk("DoubleTalk PC at %03x-%03x, "
406                                "ROM version %s, serial number %u",
407                                dtlk_portlist[i], dtlk_portlist[i] +
408                                DTLK_IO_EXTENT - 1,
409                                sp->rom_version, sp->serial_number);
410
411                         /* put LPC port into known state, so
412                            dtlk_readable() gives valid result */
413                         outb_p(0xff, dtlk_port_lpc); 
414
415                         /* INIT string and index marker */
416                         dtlk_write_bytes("\036\1@\0\0012I\r", 8);
417                         /* posting an index takes 18 msec.  Here, we
418                            wait up to 100 msec to see whether it
419                            appears. */
420                         msleep_interruptible(100);
421                         dtlk_has_indexing = dtlk_readable();
422 #ifdef TRACING
423                         printk(", indexing %d\n", dtlk_has_indexing);
424 #endif
425 #ifdef INSCOPE
426                         {
427 /* This macro records ten samples read from the LPC port, for later display */
428 #define LOOK                                    \
429 for (i = 0; i < 10; i++)                        \
430   {                                             \
431     buffer[b++] = inb_p(dtlk_port_lpc);         \
432     __delay(loops_per_jiffy/(1000000/HZ));             \
433   }
434                                 char buffer[1000];
435                                 int b = 0, i, j;
436
437                                 LOOK
438                                 outb_p(0xff, dtlk_port_lpc);
439                                 buffer[b++] = 0;
440                                 LOOK
441                                 dtlk_write_bytes("\0012I\r", 4);
442                                 buffer[b++] = 0;
443                                 __delay(50 * loops_per_jiffy / (1000/HZ));
444                                 outb_p(0xff, dtlk_port_lpc);
445                                 buffer[b++] = 0;
446                                 LOOK
447
448                                 printk("\n");
449                                 for (j = 0; j < b; j++)
450                                         printk(" %02x", buffer[j]);
451                                 printk("\n");
452                         }
453 #endif                          /* INSCOPE */
454
455 #ifdef OUTSCOPE
456                         {
457 /* This macro records ten samples read from the TTS port, for later display */
458 #define LOOK                                    \
459 for (i = 0; i < 10; i++)                        \
460   {                                             \
461     buffer[b++] = inb_p(dtlk_port_tts);         \
462     __delay(loops_per_jiffy/(1000000/HZ));  /* 1 us */ \
463   }
464                                 char buffer[1000];
465                                 int b = 0, i, j;
466
467                                 mdelay(10);     /* 10 ms */
468                                 LOOK
469                                 outb_p(0x03, dtlk_port_tts);
470                                 buffer[b++] = 0;
471                                 LOOK
472                                 LOOK
473
474                                 printk("\n");
475                                 for (j = 0; j < b; j++)
476                                         printk(" %02x", buffer[j]);
477                                 printk("\n");
478                         }
479 #endif                          /* OUTSCOPE */
480
481                         dtlk_write_bytes("Double Talk found", 18);
482
483                         return 0;
484                 }
485                 release_region(dtlk_portlist[i], DTLK_IO_EXTENT);
486         }
487
488         printk(KERN_INFO "DoubleTalk PC - not found\n");
489         return -ENODEV;
490 }
491
492 /*
493    static void dtlk_handle_error(char op, char rc, unsigned int minor)
494    {
495    printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n", 
496    minor, op, rc);
497    return;
498    }
499  */
500
501 /* interrogate the DoubleTalk PC and return its settings */
502 static struct dtlk_settings *dtlk_interrogate(void)
503 {
504         unsigned char *t;
505         static char buf[sizeof(struct dtlk_settings) + 1];
506         int total, i;
507         static struct dtlk_settings status;
508         TRACE_TEXT("(dtlk_interrogate");
509         dtlk_write_bytes("\030\001?", 3);
510         for (total = 0, i = 0; i < 50; i++) {
511                 buf[total] = dtlk_read_tts();
512                 if (total > 2 && buf[total] == 0x7f)
513                         break;
514                 if (total < sizeof(struct dtlk_settings))
515                         total++;
516         }
517         /*
518            if (i==50) printk("interrogate() read overrun\n");
519            for (i=0; i<sizeof(buf); i++)
520            printk(" %02x", buf[i]);
521            printk("\n");
522          */
523         t = buf;
524         status.serial_number = t[0] + t[1] * 256; /* serial number is
525                                                      little endian */
526         t += 2;
527
528         i = 0;
529         while (*t != '\r') {
530                 status.rom_version[i] = *t;
531                 if (i < sizeof(status.rom_version) - 1)
532                         i++;
533                 t++;
534         }
535         status.rom_version[i] = 0;
536         t++;
537
538         status.mode = *t++;
539         status.punc_level = *t++;
540         status.formant_freq = *t++;
541         status.pitch = *t++;
542         status.speed = *t++;
543         status.volume = *t++;
544         status.tone = *t++;
545         status.expression = *t++;
546         status.ext_dict_loaded = *t++;
547         status.ext_dict_status = *t++;
548         status.free_ram = *t++;
549         status.articulation = *t++;
550         status.reverb = *t++;
551         status.eob = *t++;
552         status.has_indexing = dtlk_has_indexing;
553         TRACE_RET;
554         return &status;
555 }
556
557 static char dtlk_read_tts(void)
558 {
559         int portval, retries = 0;
560         char ch;
561         TRACE_TEXT("(dtlk_read_tts");
562
563         /* verify DT is ready, read char, wait for ACK */
564         do {
565                 portval = inb_p(dtlk_port_tts);
566         } while ((portval & TTS_READABLE) == 0 &&
567                  retries++ < DTLK_MAX_RETRIES);
568         if (retries == DTLK_MAX_RETRIES)
569                 printk(KERN_ERR "dtlk_read_tts() timeout\n");
570
571         ch = inb_p(dtlk_port_tts);      /* input from TTS port */
572         ch &= 0x7f;
573         outb_p(ch, dtlk_port_tts);
574
575         retries = 0;
576         do {
577                 portval = inb_p(dtlk_port_tts);
578         } while ((portval & TTS_READABLE) != 0 &&
579                  retries++ < DTLK_MAX_RETRIES);
580         if (retries == DTLK_MAX_RETRIES)
581                 printk(KERN_ERR "dtlk_read_tts() timeout\n");
582
583         TRACE_RET;
584         return ch;
585 }
586
587 static char dtlk_read_lpc(void)
588 {
589         int retries = 0;
590         char ch;
591         TRACE_TEXT("(dtlk_read_lpc");
592
593         /* no need to test -- this is only called when the port is readable */
594
595         ch = inb_p(dtlk_port_lpc);      /* input from LPC port */
596
597         outb_p(0xff, dtlk_port_lpc);
598
599         /* acknowledging a read takes 3-4
600            usec.  Here, we wait up to 20 usec
601            for the acknowledgement */
602         retries = (loops_per_jiffy * 20) / (1000000/HZ);
603         while (inb_p(dtlk_port_lpc) != 0x7f && --retries > 0);
604         if (retries == 0)
605                 printk(KERN_ERR "dtlk_read_lpc() timeout\n");
606
607         TRACE_RET;
608         return ch;
609 }
610
611 /* write n bytes to tts port */
612 static char dtlk_write_bytes(const char *buf, int n)
613 {
614         char val = 0;
615         /*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */
616         TRACE_TEXT("(dtlk_write_bytes");
617         while (n-- > 0)
618                 val = dtlk_write_tts(*buf++);
619         TRACE_RET;
620         return val;
621 }
622
623 static char dtlk_write_tts(char ch)
624 {
625         int retries = 0;
626 #ifdef TRACINGMORE
627         printk("  dtlk_write_tts(");
628         if (' ' <= ch && ch <= '~')
629                 printk("'%c'", ch);
630         else
631                 printk("0x%02x", ch);
632 #endif
633         if (ch != DTLK_CLEAR)   /* no flow control for CLEAR command */
634                 while ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0 &&
635                        retries++ < DTLK_MAX_RETRIES)    /* DT ready? */
636                         ;
637         if (retries == DTLK_MAX_RETRIES)
638                 printk(KERN_ERR "dtlk_write_tts() timeout\n");
639
640         outb_p(ch, dtlk_port_tts);      /* output to TTS port */
641         /* the RDY bit goes zero 2-3 usec after writing, and goes
642            1 again 180-190 usec later.  Here, we wait up to 10
643            usec for the RDY bit to go zero. */
644         for (retries = 0; retries < loops_per_jiffy / (100000/HZ); retries++)
645                 if ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0)
646                         break;
647
648 #ifdef TRACINGMORE
649         printk(")\n");
650 #endif
651         return 0;
652 }
653
654 MODULE_LICENSE("GPL");