drivers/accessibility/speakup/speakup_decext.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/jiffies.h>
  13 #include <linux/sched.h>
  14 #include <linux/timer.h>
  15 #include <linux/kthread.h>
  16
  17 #include "spk_priv.h"
  18 #include "speakup.h"
  19
  20 #define DRV_VERSION "2.14"
  21 #define SYNTH_CLEAR 0x03
  22 #define PROCSPEECH 0x0b
  23
  24 static volatile unsigned char last_char;
  25
  26 static void read_buff_add(u_char ch)
  27 {
  28         last_char = ch;
  29 }
  30
  31 static inline bool synth_full(void)
  32 {
  33         return last_char == 0x13;
  34 }
  35
  36 static void do_catch_up(struct spk_synth *synth);
  37 static void synth_flush(struct spk_synth *synth);
  38
  39 static int in_escape;
  40
  41 static struct var_t vars[] = {
  42         { CAPS_START, .u.s = {"[:dv ap 222]" } },
  43         { CAPS_STOP, .u.s = {"[:dv ap 100]" } },
  44         { RATE, .u.n = {"[:ra %d]", 7, 0, 9, 150, 25, NULL } },
  45         { PITCH, .u.n = {"[:dv ap %d]", 100, 0, 100, 0, 0, NULL } },
  46         { INFLECTION, .u.n = {"[:dv pr %d] ", 100, 0, 10000, 0, 0, NULL } },
  47         { VOL, .u.n = {"[:dv gv %d]", 13, 0, 16, 0, 5, NULL } },
  48         { PUNCT, .u.n = {"[:pu %c]", 0, 0, 2, 0, 0, "nsa" } },
  49         { VOICE, .u.n = {"[:n%c]", 0, 0, 9, 0, 0, "phfdburwkv" } },
  50         { DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
  51         V_LAST_VAR
  52 };
  53
  54 /*
  55  * These attributes will appear in /sys/accessibility/speakup/decext.
  56  */
  57 static struct kobj_attribute caps_start_attribute =
  58         __ATTR(caps_start, 0644, spk_var_show, spk_var_store);
  59 static struct kobj_attribute caps_stop_attribute =
  60         __ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
  61 static struct kobj_attribute pitch_attribute =
  62         __ATTR(pitch, 0644, spk_var_show, spk_var_store);
  63 static struct kobj_attribute inflection_attribute =
  64         __ATTR(inflection, 0644, spk_var_show, spk_var_store);
  65 static struct kobj_attribute punct_attribute =
  66         __ATTR(punct, 0644, spk_var_show, spk_var_store);
  67 static struct kobj_attribute rate_attribute =
  68         __ATTR(rate, 0644, spk_var_show, spk_var_store);
  69 static struct kobj_attribute voice_attribute =
  70         __ATTR(voice, 0644, spk_var_show, spk_var_store);
  71 static struct kobj_attribute vol_attribute =
  72         __ATTR(vol, 0644, spk_var_show, spk_var_store);
  73
  74 static struct kobj_attribute delay_time_attribute =
  75         __ATTR(delay_time, 0644, spk_var_show, spk_var_store);
  76 static struct kobj_attribute direct_attribute =
  77         __ATTR(direct, 0644, spk_var_show, spk_var_store);
  78 static struct kobj_attribute full_time_attribute =
  79         __ATTR(full_time, 0644, spk_var_show, spk_var_store);
  80 static struct kobj_attribute jiffy_delta_attribute =
  81         __ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
  82 static struct kobj_attribute trigger_time_attribute =
  83         __ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
  84
  85 /*
  86  * Create a group of attributes so that we can create and destroy them all
  87  * at once.
  88  */
  89 static struct attribute *synth_attrs[] = {
  90         &caps_start_attribute.attr,
  91         &caps_stop_attribute.attr,
  92         &pitch_attribute.attr,
  93         &inflection_attribute.attr,
  94         &punct_attribute.attr,
  95         &rate_attribute.attr,
  96         &voice_attribute.attr,
  97         &vol_attribute.attr,
  98         &delay_time_attribute.attr,
  99         &direct_attribute.attr,
 100         &full_time_attribute.attr,
 101         &jiffy_delta_attribute.attr,
 102         &trigger_time_attribute.attr,
 103         NULL,   /* need to NULL terminate the list of attributes */
 104 };
 105
 106 static struct spk_synth synth_decext = {
 107         .name = "decext",
 108         .version = DRV_VERSION,
 109         .long_name = "Dectalk External",
 110         .init = "[:pe -380]",
 111         .procspeech = PROCSPEECH,
 112         .clear = SYNTH_CLEAR,
 113         .delay = 500,
 114         .trigger = 50,
 115         .jiffies = 50,
 116         .full = 40000,
 117         .flags = SF_DEC,
 118         .dev_name = SYNTH_DEFAULT_DEV,
 119         .startup = SYNTH_START,
 120         .checkval = SYNTH_CHECK,
 121         .vars = vars,
 122         .io_ops = &spk_ttyio_ops,
 123         .probe = spk_ttyio_synth_probe,
 124         .release = spk_ttyio_release,
 125         .synth_immediate = spk_ttyio_synth_immediate,
 126         .catch_up = do_catch_up,
 127         .flush = synth_flush,
 128         .is_alive = spk_synth_is_alive_restart,
 129         .synth_adjust = NULL,
 130         .read_buff_add = read_buff_add,
 131         .get_index = NULL,
 132         .indexing = {
 133                 .command = NULL,
 134                 .lowindex = 0,
 135                 .highindex = 0,
 136                 .currindex = 0,
 137         },
 138         .attributes = {
 139                 .attrs = synth_attrs,
 140                 .name = "decext",
 141         },
 142 };
 143
 144 static void do_catch_up(struct spk_synth *synth)
 145 {
 146         u_char ch;
 147         static u_char last = '\0';
 148         unsigned long flags;
 149         unsigned long jiff_max;
 150         struct var_t *jiffy_delta;
 151         struct var_t *delay_time;
 152         int jiffy_delta_val = 0;
 153         int delay_time_val = 0;
 154
 155         jiffy_delta = spk_get_var(JIFFY);
 156         delay_time = spk_get_var(DELAY);
 157
 158         spin_lock_irqsave(&speakup_info.spinlock, flags);
 159         jiffy_delta_val = jiffy_delta->u.n.value;
 160         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 161         jiff_max = jiffies + jiffy_delta_val;
 162
 163         while (!kthread_should_stop()) {
 164                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 165                 if (speakup_info.flushing) {
 166                         speakup_info.flushing = 0;
 167                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 168                         synth->flush(synth);
 169                         continue;
 170                 }
 171                 synth_buffer_skip_nonlatin1();
 172                 if (synth_buffer_empty()) {
 173                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 174                         break;
 175                 }
 176                 ch = synth_buffer_peek();
 177                 set_current_state(TASK_INTERRUPTIBLE);
 178                 delay_time_val = delay_time->u.n.value;
 179                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 180                 if (ch == '\n')
 181                         ch = 0x0D;
 182                 if (synth_full() || !synth->io_ops->synth_out(synth, ch)) {
 183                         schedule_timeout(msecs_to_jiffies(delay_time_val));
 184                         continue;
 185                 }
 186                 set_current_state(TASK_RUNNING);
 187                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 188                 synth_buffer_getc();
 189                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 190                 if (ch == '[') {
 191                         in_escape = 1;
 192                 } else if (ch == ']') {
 193                         in_escape = 0;
 194                 } else if (ch <= SPACE) {
 195                         if (!in_escape && strchr(",.!?;:", last))
 196                                 synth->io_ops->synth_out(synth, PROCSPEECH);
 197                         if (time_after_eq(jiffies, jiff_max)) {
 198                                 if (!in_escape)
 199                                         synth->io_ops->synth_out(synth,
 200                                                                  PROCSPEECH);
 201                                 spin_lock_irqsave(&speakup_info.spinlock,
 202                                                   flags);
 203                                 jiffy_delta_val = jiffy_delta->u.n.value;
 204                                 delay_time_val = delay_time->u.n.value;
 205                                 spin_unlock_irqrestore(&speakup_info.spinlock,
 206                                                        flags);
 207                                 schedule_timeout(msecs_to_jiffies
 208                                                  (delay_time_val));
 209                                 jiff_max = jiffies + jiffy_delta_val;
 210                         }
 211                 }
 212                 last = ch;
 213         }
 214         if (!in_escape)
 215                 synth->io_ops->synth_out(synth, PROCSPEECH);
 216 }
 217
 218 static void synth_flush(struct spk_synth *synth)
 219 {
 220         in_escape = 0;
 221         synth->io_ops->flush_buffer(synth);
 222         synth->synth_immediate(synth, "\033P;10z\033\\");
 223 }
 224
 225 module_param_named(ser, synth_decext.ser, int, 0444);
 226 module_param_named(dev, synth_decext.dev_name, charp, 0444);
 227 module_param_named(start, synth_decext.startup, short, 0444);
 228
 229 MODULE_PARM_DESC(ser, "Set the serial port for the synthesizer (0-based).");
 230 MODULE_PARM_DESC(dev, "Set the device e.g. ttyUSB0, for the synthesizer.");
 231 MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
 232
 233 module_spk_synth(synth_decext);
 234
 235 MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
 236 MODULE_AUTHOR("David Borowski");
 237 MODULE_DESCRIPTION("Speakup support for DECtalk External synthesizers");
 238 MODULE_LICENSE("GPL");
 239 MODULE_VERSION(DRV_VERSION);
 240