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