kernel/drivers/staging/speakup/synth.c

   1 #include <linux/types.h>
   2 #include <linux/ctype.h>        /* for isdigit() and friends */
   3 #include <linux/fs.h>
   4 #include <linux/mm.h>           /* for verify_area */
   5 #include <linux/errno.h>        /* for -EBUSY */
   6 #include <linux/ioport.h>       /* for check_region, request_region */
   7 #include <linux/interrupt.h>
   8 #include <linux/delay.h>        /* for loops_per_sec */
   9 #include <linux/kmod.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/uaccess.h> /* for copy_from_user */
  12 #include <linux/sched.h>
  13 #include <linux/timer.h>
  14 #include <linux/kthread.h>
  15
  16 #include "spk_priv.h"
  17 #include "speakup.h"
  18 #include "serialio.h"
  19
  20 #define MAXSYNTHS       16      /* Max number of synths in array. */
  21 static struct spk_synth *synths[MAXSYNTHS];
  22 struct spk_synth *synth;
  23 char spk_pitch_buff[32] = "";
  24 static int module_status;
  25 bool spk_quiet_boot;
  26
  27 struct speakup_info_t speakup_info = {
  28         /*
  29          * This spinlock is used to protect the entire speakup machinery, and
  30          * must be taken at each kernel->speakup transition and released at
  31          * each corresponding speakup->kernel transition.
  32          *
  33          * The progression thread only interferes with the speakup machinery
  34          * through the synth buffer, so only needs to take the lock
  35          * while tinkering with the buffer.
  36          *
  37          * We use spin_lock/trylock_irqsave and spin_unlock_irqrestore with this
  38          * spinlock because speakup needs to disable the keyboard IRQ.
  39          */
  40         .spinlock = __SPIN_LOCK_UNLOCKED(speakup_info.spinlock),
  41         .flushing = 0,
  42 };
  43 EXPORT_SYMBOL_GPL(speakup_info);
  44
  45 static int do_synth_init(struct spk_synth *in_synth);
  46
  47 int spk_serial_synth_probe(struct spk_synth *synth)
  48 {
  49         const struct old_serial_port *ser;
  50         int failed = 0;
  51
  52         if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {
  53                 ser = spk_serial_init(synth->ser);
  54                 if (ser == NULL) {
  55                         failed = -1;
  56                 } else {
  57                         outb_p(0, ser->port);
  58                         mdelay(1);
  59                         outb_p('\r', ser->port);
  60                 }
  61         } else {
  62                 failed = -1;
  63                 pr_warn("ttyS%i is an invalid port\n", synth->ser);
  64         }
  65         if (failed) {
  66                 pr_info("%s: not found\n", synth->long_name);
  67                 return -ENODEV;
  68         }
  69         pr_info("%s: ttyS%i, Driver Version %s\n",
  70                         synth->long_name, synth->ser, synth->version);
  71         synth->alive = 1;
  72         return 0;
  73 }
  74 EXPORT_SYMBOL_GPL(spk_serial_synth_probe);
  75
  76 /* Main loop of the progression thread: keep eating from the buffer
  77  * and push to the serial port, waiting as needed
  78  *
  79  * For devices that have a "full" notification mechanism, the driver can
  80  * adapt the loop the way they prefer.
  81  */
  82 void spk_do_catch_up(struct spk_synth *synth)
  83 {
  84         u_char ch;
  85         unsigned long flags;
  86         unsigned long jiff_max;
  87         struct var_t *delay_time;
  88         struct var_t *full_time;
  89         struct var_t *jiffy_delta;
  90         int jiffy_delta_val;
  91         int delay_time_val;
  92         int full_time_val;
  93
  94         jiffy_delta = spk_get_var(JIFFY);
  95         full_time = spk_get_var(FULL);
  96         delay_time = spk_get_var(DELAY);
  97
  98         spin_lock_irqsave(&speakup_info.spinlock, flags);
  99         jiffy_delta_val = jiffy_delta->u.n.value;
 100         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 101
 102         jiff_max = jiffies + jiffy_delta_val;
 103         while (!kthread_should_stop()) {
 104                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 105                 if (speakup_info.flushing) {
 106                         speakup_info.flushing = 0;
 107                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 108                         synth->flush(synth);
 109                         continue;
 110                 }
 111                 if (synth_buffer_empty()) {
 112                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 113                         break;
 114                 }
 115                 ch = synth_buffer_peek();
 116                 set_current_state(TASK_INTERRUPTIBLE);
 117                 full_time_val = full_time->u.n.value;
 118                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 119                 if (ch == '\n')
 120                         ch = synth->procspeech;
 121                 if (!spk_serial_out(ch)) {
 122                         schedule_timeout(msecs_to_jiffies(full_time_val));
 123                         continue;
 124                 }
 125                 if (time_after_eq(jiffies, jiff_max) && (ch == SPACE)) {
 126                         spin_lock_irqsave(&speakup_info.spinlock, flags);
 127                         jiffy_delta_val = jiffy_delta->u.n.value;
 128                         delay_time_val = delay_time->u.n.value;
 129                         full_time_val = full_time->u.n.value;
 130                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 131                         if (spk_serial_out(synth->procspeech))
 132                                 schedule_timeout(
 133                                         msecs_to_jiffies(delay_time_val));
 134                         else
 135                                 schedule_timeout(
 136                                         msecs_to_jiffies(full_time_val));
 137                         jiff_max = jiffies + jiffy_delta_val;
 138                 }
 139                 set_current_state(TASK_RUNNING);
 140                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 141                 synth_buffer_getc();
 142                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 143         }
 144         spk_serial_out(synth->procspeech);
 145 }
 146 EXPORT_SYMBOL_GPL(spk_do_catch_up);
 147
 148 const char *spk_synth_immediate(struct spk_synth *synth, const char *buff)
 149 {
 150         u_char ch;
 151
 152         while ((ch = *buff)) {
 153                 if (ch == '\n')
 154                         ch = synth->procspeech;
 155                 if (spk_wait_for_xmitr())
 156                         outb(ch, speakup_info.port_tts);
 157                 else
 158                         return buff;
 159                 buff++;
 160         }
 161         return NULL;
 162 }
 163 EXPORT_SYMBOL_GPL(spk_synth_immediate);
 164
 165 void spk_synth_flush(struct spk_synth *synth)
 166 {
 167         spk_serial_out(synth->clear);
 168 }
 169 EXPORT_SYMBOL_GPL(spk_synth_flush);
 170
 171 int spk_synth_is_alive_nop(struct spk_synth *synth)
 172 {
 173         synth->alive = 1;
 174         return 1;
 175 }
 176 EXPORT_SYMBOL_GPL(spk_synth_is_alive_nop);
 177
 178 int spk_synth_is_alive_restart(struct spk_synth *synth)
 179 {
 180         if (synth->alive)
 181                 return 1;
 182         if (!synth->alive && spk_wait_for_xmitr() > 0) {
 183                 /* restart */
 184                 synth->alive = 1;
 185                 synth_printf("%s", synth->init);
 186                 return 2; /* reenabled */
 187         }
 188         pr_warn("%s: can't restart synth\n", synth->long_name);
 189         return 0;
 190 }
 191 EXPORT_SYMBOL_GPL(spk_synth_is_alive_restart);
 192
 193 static void thread_wake_up(u_long data)
 194 {
 195         wake_up_interruptible_all(&speakup_event);
 196 }
 197
 198 static DEFINE_TIMER(thread_timer, thread_wake_up, 0, 0);
 199
 200 void synth_start(void)
 201 {
 202         struct var_t *trigger_time;
 203
 204         if (!synth->alive) {
 205                 synth_buffer_clear();
 206                 return;
 207         }
 208         trigger_time = spk_get_var(TRIGGER);
 209         if (!timer_pending(&thread_timer))
 210                 mod_timer(&thread_timer, jiffies +
 211                         msecs_to_jiffies(trigger_time->u.n.value));
 212 }
 213
 214 void spk_do_flush(void)
 215 {
 216         if (!synth)
 217                 return;
 218
 219         speakup_info.flushing = 1;
 220         synth_buffer_clear();
 221         if (synth->alive) {
 222                 if (spk_pitch_shift) {
 223                         synth_printf("%s", spk_pitch_buff);
 224                         spk_pitch_shift = 0;
 225                 }
 226         }
 227         wake_up_interruptible_all(&speakup_event);
 228         wake_up_process(speakup_task);
 229 }
 230
 231 void synth_write(const char *buf, size_t count)
 232 {
 233         while (count--)
 234                 synth_buffer_add(*buf++);
 235         synth_start();
 236 }
 237
 238 void synth_printf(const char *fmt, ...)
 239 {
 240         va_list args;
 241         unsigned char buf[160], *p;
 242         int r;
 243
 244         va_start(args, fmt);
 245         r = vsnprintf(buf, sizeof(buf), fmt, args);
 246         va_end(args);
 247         if (r > sizeof(buf) - 1)
 248                 r = sizeof(buf) - 1;
 249
 250         p = buf;
 251         while (r--)
 252                 synth_buffer_add(*p++);
 253         synth_start();
 254 }
 255 EXPORT_SYMBOL_GPL(synth_printf);
 256
 257 static int index_count;
 258 static int sentence_count;
 259
 260 void spk_reset_index_count(int sc)
 261 {
 262         static int first = 1;
 263
 264         if (first)
 265                 first = 0;
 266         else
 267                 synth->get_index();
 268         index_count = 0;
 269         sentence_count = sc;
 270 }
 271
 272 int synth_supports_indexing(void)
 273 {
 274         if (synth->get_index != NULL)
 275                 return 1;
 276         return 0;
 277 }
 278
 279 void synth_insert_next_index(int sent_num)
 280 {
 281         int out;
 282
 283         if (synth->alive) {
 284                 if (sent_num == 0) {
 285                         synth->indexing.currindex++;
 286                         index_count++;
 287                         if (synth->indexing.currindex >
 288                                         synth->indexing.highindex)
 289                                 synth->indexing.currindex =
 290                                         synth->indexing.lowindex;
 291                 }
 292
 293                 out = synth->indexing.currindex * 10 + sent_num;
 294                 synth_printf(synth->indexing.command, out, out);
 295         }
 296 }
 297
 298 void spk_get_index_count(int *linecount, int *sentcount)
 299 {
 300         int ind = synth->get_index();
 301
 302         if (ind) {
 303                 sentence_count = ind % 10;
 304
 305                 if ((ind / 10) <= synth->indexing.currindex)
 306                         index_count = synth->indexing.currindex-(ind/10);
 307                 else
 308                         index_count = synth->indexing.currindex
 309                                 -synth->indexing.lowindex
 310                                 + synth->indexing.highindex-(ind/10)+1;
 311
 312         }
 313         *sentcount = sentence_count;
 314         *linecount = index_count;
 315 }
 316
 317 static struct resource synth_res;
 318
 319 int synth_request_region(unsigned long start, unsigned long n)
 320 {
 321         struct resource *parent = &ioport_resource;
 322
 323         memset(&synth_res, 0, sizeof(synth_res));
 324         synth_res.name = synth->name;
 325         synth_res.start = start;
 326         synth_res.end = start + n - 1;
 327         synth_res.flags = IORESOURCE_BUSY;
 328         return request_resource(parent, &synth_res);
 329 }
 330 EXPORT_SYMBOL_GPL(synth_request_region);
 331
 332 int synth_release_region(unsigned long start, unsigned long n)
 333 {
 334         return release_resource(&synth_res);
 335 }
 336 EXPORT_SYMBOL_GPL(synth_release_region);
 337
 338 struct var_t synth_time_vars[] = {
 339         { DELAY, .u.n = {NULL, 100, 100, 2000, 0, 0, NULL } },
 340         { TRIGGER, .u.n = {NULL, 20, 10, 2000, 0, 0, NULL } },
 341         { JIFFY, .u.n = {NULL, 50, 20, 200, 0, 0, NULL } },
 342         { FULL, .u.n = {NULL, 400, 200, 60000, 0, 0, NULL } },
 343         V_LAST_VAR
 344 };
 345
 346 /* called by: speakup_init() */
 347 int synth_init(char *synth_name)
 348 {
 349         int i;
 350         int ret = 0;
 351         struct spk_synth *synth = NULL;
 352
 353         if (synth_name == NULL)
 354                 return 0;
 355
 356         if (strcmp(synth_name, "none") == 0) {
 357                 mutex_lock(&spk_mutex);
 358                 synth_release();
 359                 mutex_unlock(&spk_mutex);
 360                 return 0;
 361         }
 362
 363         mutex_lock(&spk_mutex);
 364         /* First, check if we already have it loaded. */
 365         for (i = 0; i < MAXSYNTHS && synths[i] != NULL; i++)
 366                 if (strcmp(synths[i]->name, synth_name) == 0)
 367                         synth = synths[i];
 368
 369         /* If we got one, initialize it now. */
 370         if (synth)
 371                 ret = do_synth_init(synth);
 372         else
 373                 ret = -ENODEV;
 374         mutex_unlock(&spk_mutex);
 375
 376         return ret;
 377 }
 378
 379 /* called by: synth_add() */
 380 static int do_synth_init(struct spk_synth *in_synth)
 381 {
 382         struct var_t *var;
 383
 384         synth_release();
 385         if (in_synth->checkval != SYNTH_CHECK)
 386                 return -EINVAL;
 387         synth = in_synth;
 388         synth->alive = 0;
 389         pr_warn("synth probe\n");
 390         if (synth->probe(synth) < 0) {
 391                 pr_warn("%s: device probe failed\n", in_synth->name);
 392                 synth = NULL;
 393                 return -ENODEV;
 394         }
 395         synth_time_vars[0].u.n.value =
 396                 synth_time_vars[0].u.n.default_val = synth->delay;
 397         synth_time_vars[1].u.n.value =
 398                 synth_time_vars[1].u.n.default_val = synth->trigger;
 399         synth_time_vars[2].u.n.value =
 400                 synth_time_vars[2].u.n.default_val = synth->jiffies;
 401         synth_time_vars[3].u.n.value =
 402                 synth_time_vars[3].u.n.default_val = synth->full;
 403         synth_printf("%s", synth->init);
 404         for (var = synth->vars;
 405                 (var->var_id >= 0) && (var->var_id < MAXVARS); var++)
 406                 speakup_register_var(var);
 407         if (!spk_quiet_boot)
 408                 synth_printf("%s found\n", synth->long_name);
 409         if (synth->attributes.name
 410         && sysfs_create_group(speakup_kobj, &(synth->attributes)) < 0)
 411                 return -ENOMEM;
 412         synth_flags = synth->flags;
 413         wake_up_interruptible_all(&speakup_event);
 414         if (speakup_task)
 415                 wake_up_process(speakup_task);
 416         return 0;
 417 }
 418
 419 void synth_release(void)
 420 {
 421         struct var_t *var;
 422         unsigned long flags;
 423
 424         if (synth == NULL)
 425                 return;
 426         spin_lock_irqsave(&speakup_info.spinlock, flags);
 427         pr_info("releasing synth %s\n", synth->name);
 428         synth->alive = 0;
 429         del_timer(&thread_timer);
 430         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 431         if (synth->attributes.name)
 432                 sysfs_remove_group(speakup_kobj, &(synth->attributes));
 433         for (var = synth->vars; var->var_id != MAXVARS; var++)
 434                 speakup_unregister_var(var->var_id);
 435         spk_stop_serial_interrupt();
 436         synth->release();
 437         synth = NULL;
 438 }
 439
 440 /* called by: all_driver_init() */
 441 int synth_add(struct spk_synth *in_synth)
 442 {
 443         int i;
 444         int status = 0;
 445
 446         mutex_lock(&spk_mutex);
 447         for (i = 0; i < MAXSYNTHS && synths[i] != NULL; i++)
 448                 /* synth_remove() is responsible for rotating the array down */
 449                 if (in_synth == synths[i]) {
 450                         mutex_unlock(&spk_mutex);
 451                         return 0;
 452                 }
 453         if (i == MAXSYNTHS) {
 454                 pr_warn("Error: attempting to add a synth past end of array\n");
 455                 mutex_unlock(&spk_mutex);
 456                 return -1;
 457         }
 458         synths[i++] = in_synth;
 459         synths[i] = NULL;
 460         if (in_synth->startup)
 461                 status = do_synth_init(in_synth);
 462         mutex_unlock(&spk_mutex);
 463         return status;
 464 }
 465 EXPORT_SYMBOL_GPL(synth_add);
 466
 467 void synth_remove(struct spk_synth *in_synth)
 468 {
 469         int i;
 470
 471         mutex_lock(&spk_mutex);
 472         if (synth == in_synth)
 473                 synth_release();
 474         for (i = 0; synths[i] != NULL; i++) {
 475                 if (in_synth == synths[i])
 476                         break;
 477         }
 478         for ( ; synths[i] != NULL; i++) /* compress table */
 479                 synths[i] = synths[i+1];
 480         module_status = 0;
 481         mutex_unlock(&spk_mutex);
 482 }
 483 EXPORT_SYMBOL_GPL(synth_remove);
 484
 485 short spk_punc_masks[] = { 0, SOME, MOST, PUNC, PUNC|B_SYM };