drivers/accessibility/speakup/speakup_dectlk.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
   4  * this version considerably modified by David Borowski, david575@rogers.com
   5  *
   6  * Copyright (C) 1998-99  Kirk Reiser.
   7  * Copyright (C) 2003 David Borowski.
   8  *
   9  * specifically written as a driver for the speakup screenreview
  10  * s not a general device driver.
  11  */
  12 #include <linux/unistd.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/sched.h>
  17 #include <linux/timer.h>
  18 #include <linux/kthread.h>
  19 #include "speakup.h"
  20 #include "spk_priv.h"
  21
  22 #define DRV_VERSION "2.20"
  23 #define SYNTH_CLEAR 0x03
  24 #define PROCSPEECH 0x0b
  25 static int xoff;
  26
  27 static inline int synth_full(void)
  28 {
  29         return xoff;
  30 }
  31
  32 static void do_catch_up(struct spk_synth *synth);
  33 static void synth_flush(struct spk_synth *synth);
  34 static void read_buff_add(u_char c);
  35 static unsigned char get_index(struct spk_synth *synth);
  36
  37 static int in_escape;
  38 static int is_flushing;
  39
  40 static DEFINE_SPINLOCK(flush_lock);
  41 static DECLARE_WAIT_QUEUE_HEAD(flush);
  42
  43 static struct var_t vars[] = {
  44         { CAPS_START, .u.s = {"[:dv ap 160] " } },
  45         { CAPS_STOP, .u.s = {"[:dv ap 100 ] " } },
  46         { RATE, .u.n = {"[:ra %d] ", 180, 75, 650, 0, 0, NULL } },
  47         { PITCH, .u.n = {"[:dv ap %d] ", 122, 50, 350, 0, 0, NULL } },
  48         { INFLECTION, .u.n = {"[:dv pr %d] ", 100, 0, 10000, 0, 0, NULL } },
  49         { VOL, .u.n = {"[:dv g5 %d] ", 86, 60, 86, 0, 0, NULL } },
  50         { PUNCT, .u.n = {"[:pu %c] ", 0, 0, 2, 0, 0, "nsa" } },
  51         { VOICE, .u.n = {"[:n%c] ", 0, 0, 9, 0, 0, "phfdburwkv" } },
  52         { DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
  53         V_LAST_VAR
  54 };
  55
  56 /*
  57  * These attributes will appear in /sys/accessibility/speakup/dectlk.
  58  */
  59 static struct kobj_attribute caps_start_attribute =
  60         __ATTR(caps_start, 0644, spk_var_show, spk_var_store);
  61 static struct kobj_attribute caps_stop_attribute =
  62         __ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
  63 static struct kobj_attribute pitch_attribute =
  64         __ATTR(pitch, 0644, spk_var_show, spk_var_store);
  65 static struct kobj_attribute inflection_attribute =
  66         __ATTR(inflection, 0644, spk_var_show, spk_var_store);
  67 static struct kobj_attribute punct_attribute =
  68         __ATTR(punct, 0644, spk_var_show, spk_var_store);
  69 static struct kobj_attribute rate_attribute =
  70         __ATTR(rate, 0644, spk_var_show, spk_var_store);
  71 static struct kobj_attribute voice_attribute =
  72         __ATTR(voice, 0644, spk_var_show, spk_var_store);
  73 static struct kobj_attribute vol_attribute =
  74         __ATTR(vol, 0644, spk_var_show, spk_var_store);
  75
  76 static struct kobj_attribute delay_time_attribute =
  77         __ATTR(delay_time, 0644, spk_var_show, spk_var_store);
  78 static struct kobj_attribute direct_attribute =
  79         __ATTR(direct, 0644, spk_var_show, spk_var_store);
  80 static struct kobj_attribute full_time_attribute =
  81         __ATTR(full_time, 0644, spk_var_show, spk_var_store);
  82 static struct kobj_attribute flush_time_attribute =
  83         __ATTR(flush_time, 0644, spk_var_show, spk_var_store);
  84 static struct kobj_attribute jiffy_delta_attribute =
  85         __ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
  86 static struct kobj_attribute trigger_time_attribute =
  87         __ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
  88
  89 /*
  90  * Create a group of attributes so that we can create and destroy them all
  91  * at once.
  92  */
  93 static struct attribute *synth_attrs[] = {
  94         &caps_start_attribute.attr,
  95         &caps_stop_attribute.attr,
  96         &pitch_attribute.attr,
  97         &inflection_attribute.attr,
  98         &punct_attribute.attr,
  99         &rate_attribute.attr,
 100         &voice_attribute.attr,
 101         &vol_attribute.attr,
 102         &delay_time_attribute.attr,
 103         &direct_attribute.attr,
 104         &full_time_attribute.attr,
 105         &flush_time_attribute.attr,
 106         &jiffy_delta_attribute.attr,
 107         &trigger_time_attribute.attr,
 108         NULL,   /* need to NULL terminate the list of attributes */
 109 };
 110
 111 static int ap_defaults[] = {122, 89, 155, 110, 208, 240, 200, 106, 306};
 112 static int g5_defaults[] = {86, 81, 86, 84, 81, 80, 83, 83, 73};
 113
 114 static struct spk_synth synth_dectlk = {
 115         .name = "dectlk",
 116         .version = DRV_VERSION,
 117         .long_name = "Dectalk Express",
 118         .init = "[:error sp :name paul :rate 180 :tsr off] ",
 119         .procspeech = PROCSPEECH,
 120         .clear = SYNTH_CLEAR,
 121         .delay = 500,
 122         .trigger = 50,
 123         .jiffies = 50,
 124         .full = 40000,
 125         .flush_time = 4000,
 126         .dev_name = SYNTH_DEFAULT_DEV,
 127         .startup = SYNTH_START,
 128         .checkval = SYNTH_CHECK,
 129         .vars = vars,
 130         .default_pitch = ap_defaults,
 131         .default_vol = g5_defaults,
 132         .io_ops = &spk_ttyio_ops,
 133         .probe = spk_ttyio_synth_probe,
 134         .release = spk_ttyio_release,
 135         .synth_immediate = spk_ttyio_synth_immediate,
 136         .catch_up = do_catch_up,
 137         .flush = synth_flush,
 138         .is_alive = spk_synth_is_alive_restart,
 139         .synth_adjust = NULL,
 140         .read_buff_add = read_buff_add,
 141         .get_index = get_index,
 142         .indexing = {
 143                 .command = "[:in re %d ] ",
 144                 .lowindex = 1,
 145                 .highindex = 8,
 146                 .currindex = 1,
 147         },
 148         .attributes = {
 149                 .attrs = synth_attrs,
 150                 .name = "dectlk",
 151         },
 152 };
 153
 154 static int is_indnum(u_char *ch)
 155 {
 156         if ((*ch >= '0') && (*ch <= '9')) {
 157                 *ch = *ch - '0';
 158                 return 1;
 159         }
 160         return 0;
 161 }
 162
 163 static u_char lastind;
 164
 165 static unsigned char get_index(struct spk_synth *synth)
 166 {
 167         u_char rv;
 168
 169         rv = lastind;
 170         lastind = 0;
 171         return rv;
 172 }
 173
 174 static void read_buff_add(u_char c)
 175 {
 176         static int ind = -1;
 177
 178         if (c == 0x01) {
 179                 unsigned long flags;
 180
 181                 spin_lock_irqsave(&flush_lock, flags);
 182                 is_flushing = 0;
 183                 wake_up_interruptible(&flush);
 184                 spin_unlock_irqrestore(&flush_lock, flags);
 185         } else if (c == 0x13) {
 186                 xoff = 1;
 187         } else if (c == 0x11) {
 188                 xoff = 0;
 189         } else if (is_indnum(&c)) {
 190                 if (ind == -1)
 191                         ind = c;
 192                 else
 193                         ind = ind * 10 + c;
 194         } else if ((c > 31) && (c < 127)) {
 195                 if (ind != -1)
 196                         lastind = (u_char)ind;
 197                 ind = -1;
 198         }
 199 }
 200
 201 static void do_catch_up(struct spk_synth *synth)
 202 {
 203         int synth_full_val = 0;
 204         static u_char ch;
 205         static u_char last = '\0';
 206         unsigned long flags;
 207         unsigned long jiff_max;
 208         unsigned long timeout;
 209         DEFINE_WAIT(wait);
 210         struct var_t *jiffy_delta;
 211         struct var_t *delay_time;
 212         struct var_t *flush_time;
 213         int jiffy_delta_val;
 214         int delay_time_val;
 215         int timeout_val;
 216
 217         jiffy_delta = spk_get_var(JIFFY);
 218         delay_time = spk_get_var(DELAY);
 219         flush_time = spk_get_var(FLUSH);
 220         spin_lock_irqsave(&speakup_info.spinlock, flags);
 221         jiffy_delta_val = jiffy_delta->u.n.value;
 222         timeout_val = flush_time->u.n.value;
 223         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 224         timeout = msecs_to_jiffies(timeout_val);
 225         jiff_max = jiffies + jiffy_delta_val;
 226
 227         while (!kthread_should_stop()) {
 228                 /* if no ctl-a in 4, send data anyway */
 229                 spin_lock_irqsave(&flush_lock, flags);
 230                 while (is_flushing && timeout) {
 231                         prepare_to_wait(&flush, &wait, TASK_INTERRUPTIBLE);
 232                         spin_unlock_irqrestore(&flush_lock, flags);
 233                         timeout = schedule_timeout(timeout);
 234                         spin_lock_irqsave(&flush_lock, flags);
 235                 }
 236                 finish_wait(&flush, &wait);
 237                 is_flushing = 0;
 238                 spin_unlock_irqrestore(&flush_lock, flags);
 239
 240                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 241                 if (speakup_info.flushing) {
 242                         speakup_info.flushing = 0;
 243                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 244                         synth->flush(synth);
 245                         continue;
 246                 }
 247                 synth_buffer_skip_nonlatin1();
 248                 if (synth_buffer_empty()) {
 249                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 250                         break;
 251                 }
 252                 ch = synth_buffer_peek();
 253                 set_current_state(TASK_INTERRUPTIBLE);
 254                 delay_time_val = delay_time->u.n.value;
 255                 synth_full_val = synth_full();
 256                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 257                 if (ch == '\n')
 258                         ch = 0x0D;
 259                 if (synth_full_val || !synth->io_ops->synth_out(synth, ch)) {
 260                         schedule_timeout(msecs_to_jiffies(delay_time_val));
 261                         continue;
 262                 }
 263                 set_current_state(TASK_RUNNING);
 264                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 265                 synth_buffer_getc();
 266                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 267                 if (ch == '[') {
 268                         in_escape = 1;
 269                 } else if (ch == ']') {
 270                         in_escape = 0;
 271                 } else if (ch <= SPACE) {
 272                         if (!in_escape && strchr(",.!?;:", last))
 273                                 synth->io_ops->synth_out(synth, PROCSPEECH);
 274                         if (time_after_eq(jiffies, jiff_max)) {
 275                                 if (!in_escape)
 276                                         synth->io_ops->synth_out(synth,
 277                                                                  PROCSPEECH);
 278                                 spin_lock_irqsave(&speakup_info.spinlock,
 279                                                   flags);
 280                                 jiffy_delta_val = jiffy_delta->u.n.value;
 281                                 delay_time_val = delay_time->u.n.value;
 282                                 spin_unlock_irqrestore(&speakup_info.spinlock,
 283                                                        flags);
 284                                 schedule_timeout(msecs_to_jiffies
 285                                                  (delay_time_val));
 286                                 jiff_max = jiffies + jiffy_delta_val;
 287                         }
 288                 }
 289                 last = ch;
 290         }
 291         if (!in_escape)
 292                 synth->io_ops->synth_out(synth, PROCSPEECH);
 293 }
 294
 295 static void synth_flush(struct spk_synth *synth)
 296 {
 297         if (in_escape)
 298                 /* if in command output ']' so we don't get an error */
 299                 synth->io_ops->synth_out(synth, ']');
 300         in_escape = 0;
 301         is_flushing = 1;
 302         synth->io_ops->flush_buffer(synth);
 303         synth->io_ops->synth_out(synth, SYNTH_CLEAR);
 304 }
 305
 306 module_param_named(ser, synth_dectlk.ser, int, 0444);
 307 module_param_named(dev, synth_dectlk.dev_name, charp, 0444);
 308 module_param_named(start, synth_dectlk.startup, short, 0444);
 309
 310 MODULE_PARM_DESC(ser, "Set the serial port for the synthesizer (0-based).");
 311 MODULE_PARM_DESC(dev, "Set the device e.g. ttyUSB0, for the synthesizer.");
 312 MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
 313
 314 module_spk_synth(synth_dectlk);
 315
 316 MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
 317 MODULE_AUTHOR("David Borowski");
 318 MODULE_DESCRIPTION("Speakup support for DECtalk Express synthesizers");
 319 MODULE_LICENSE("GPL");
 320 MODULE_VERSION(DRV_VERSION);
 321