drivers/accessibility/speakup/speakup_keypc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * written by David Borowski
   4  *
   5  * Copyright (C) 2003 David Borowski.
   6  *
   7  * specificly written as a driver for the speakup screenreview
   8  * package it's not a general device driver.
   9  * This driver is for the Keynote Gold internal synthesizer.
  10  */
  11 #include <linux/jiffies.h>
  12 #include <linux/sched.h>
  13 #include <linux/timer.h>
  14 #include <linux/kthread.h>
  15 #include <linux/serial_reg.h>
  16
  17 #include "spk_priv.h"
  18 #include "speakup.h"
  19
  20 #define DRV_VERSION "2.10"
  21 #define SYNTH_IO_EXTENT 0x04
  22 #define SWAIT udelay(70)
  23 #define PROCSPEECH 0x1f
  24 #define SYNTH_CLEAR 0x03
  25
  26 static int synth_probe(struct spk_synth *synth);
  27 static void keynote_release(struct spk_synth *synth);
  28 static const char *synth_immediate(struct spk_synth *synth, const char *buf);
  29 static void do_catch_up(struct spk_synth *synth);
  30 static void synth_flush(struct spk_synth *synth);
  31
  32 static int synth_port;
  33 static int port_forced;
  34 static unsigned int synth_portlist[] = { 0x2a8, 0 };
  35
  36 static struct var_t vars[] = {
  37         { CAPS_START, .u.s = {"[f130]" } },
  38         { CAPS_STOP, .u.s = {"[f90]" } },
  39         { RATE, .u.n = {"\04%c ", 8, 0, 10, 81, -8, NULL } },
  40         { PITCH, .u.n = {"[f%d]", 5, 0, 9, 40, 10, NULL } },
  41         { DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
  42         V_LAST_VAR
  43 };
  44
  45 /*
  46  * These attributes will appear in /sys/accessibility/speakup/keypc.
  47  */
  48 static struct kobj_attribute caps_start_attribute =
  49         __ATTR(caps_start, 0644, spk_var_show, spk_var_store);
  50 static struct kobj_attribute caps_stop_attribute =
  51         __ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
  52 static struct kobj_attribute pitch_attribute =
  53         __ATTR(pitch, 0644, spk_var_show, spk_var_store);
  54 static struct kobj_attribute rate_attribute =
  55         __ATTR(rate, 0644, spk_var_show, spk_var_store);
  56
  57 static struct kobj_attribute delay_time_attribute =
  58         __ATTR(delay_time, 0644, spk_var_show, spk_var_store);
  59 static struct kobj_attribute direct_attribute =
  60         __ATTR(direct, 0644, spk_var_show, spk_var_store);
  61 static struct kobj_attribute full_time_attribute =
  62         __ATTR(full_time, 0644, spk_var_show, spk_var_store);
  63 static struct kobj_attribute jiffy_delta_attribute =
  64         __ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
  65 static struct kobj_attribute trigger_time_attribute =
  66         __ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
  67
  68 /*
  69  * Create a group of attributes so that we can create and destroy them all
  70  * at once.
  71  */
  72 static struct attribute *synth_attrs[] = {
  73         &caps_start_attribute.attr,
  74         &caps_stop_attribute.attr,
  75         &pitch_attribute.attr,
  76         &rate_attribute.attr,
  77         &delay_time_attribute.attr,
  78         &direct_attribute.attr,
  79         &full_time_attribute.attr,
  80         &jiffy_delta_attribute.attr,
  81         &trigger_time_attribute.attr,
  82         NULL,   /* need to NULL terminate the list of attributes */
  83 };
  84
  85 static struct spk_synth synth_keypc = {
  86         .name = "keypc",
  87         .version = DRV_VERSION,
  88         .long_name = "Keynote PC",
  89         .init = "[t][n7,1][n8,0]",
  90         .procspeech = PROCSPEECH,
  91         .clear = SYNTH_CLEAR,
  92         .delay = 500,
  93         .trigger = 50,
  94         .jiffies = 50,
  95         .full = 1000,
  96         .startup = SYNTH_START,
  97         .checkval = SYNTH_CHECK,
  98         .vars = vars,
  99         .io_ops = &spk_serial_io_ops,
 100         .probe = synth_probe,
 101         .release = keynote_release,
 102         .synth_immediate = synth_immediate,
 103         .catch_up = do_catch_up,
 104         .flush = synth_flush,
 105         .is_alive = spk_synth_is_alive_nop,
 106         .synth_adjust = NULL,
 107         .read_buff_add = NULL,
 108         .get_index = NULL,
 109         .indexing = {
 110                 .command = NULL,
 111                 .lowindex = 0,
 112                 .highindex = 0,
 113                 .currindex = 0,
 114         },
 115         .attributes = {
 116                 .attrs = synth_attrs,
 117                 .name = "keypc",
 118         },
 119 };
 120
 121 static inline bool synth_writable(void)
 122 {
 123         return (inb_p(synth_port + UART_RX) & 0x10) != 0;
 124 }
 125
 126 static inline bool synth_full(void)
 127 {
 128         return (inb_p(synth_port + UART_RX) & 0x80) == 0;
 129 }
 130
 131 static char *oops(void)
 132 {
 133         int s1, s2, s3, s4;
 134
 135         s1 = inb_p(synth_port);
 136         s2 = inb_p(synth_port + 1);
 137         s3 = inb_p(synth_port + 2);
 138         s4 = inb_p(synth_port + 3);
 139         pr_warn("synth timeout %d %d %d %d\n", s1, s2, s3, s4);
 140         return NULL;
 141 }
 142
 143 static const char *synth_immediate(struct spk_synth *synth, const char *buf)
 144 {
 145         u_char ch;
 146         int timeout;
 147
 148         while ((ch = *buf)) {
 149                 if (ch == '\n')
 150                         ch = PROCSPEECH;
 151                 if (synth_full())
 152                         return buf;
 153                 timeout = 1000;
 154                 while (synth_writable())
 155                         if (--timeout <= 0)
 156                                 return oops();
 157                 outb_p(ch, synth_port);
 158                 udelay(70);
 159                 buf++;
 160         }
 161         return NULL;
 162 }
 163
 164 static void do_catch_up(struct spk_synth *synth)
 165 {
 166         u_char ch;
 167         int timeout;
 168         unsigned long flags;
 169         unsigned long jiff_max;
 170         struct var_t *jiffy_delta;
 171         struct var_t *delay_time;
 172         struct var_t *full_time;
 173         int delay_time_val;
 174         int full_time_val;
 175         int jiffy_delta_val;
 176
 177         jiffy_delta = spk_get_var(JIFFY);
 178         delay_time = spk_get_var(DELAY);
 179         full_time = spk_get_var(FULL);
 180         spin_lock_irqsave(&speakup_info.spinlock, flags);
 181         jiffy_delta_val = jiffy_delta->u.n.value;
 182         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 183
 184         jiff_max = jiffies + jiffy_delta_val;
 185         while (!kthread_should_stop()) {
 186                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 187                 if (speakup_info.flushing) {
 188                         speakup_info.flushing = 0;
 189                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 190                         synth->flush(synth);
 191                         continue;
 192                 }
 193                 synth_buffer_skip_nonlatin1();
 194                 if (synth_buffer_empty()) {
 195                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 196                         break;
 197                 }
 198                 set_current_state(TASK_INTERRUPTIBLE);
 199                 full_time_val = full_time->u.n.value;
 200                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 201                 if (synth_full()) {
 202                         schedule_timeout(msecs_to_jiffies(full_time_val));
 203                         continue;
 204                 }
 205                 set_current_state(TASK_RUNNING);
 206                 timeout = 1000;
 207                 while (synth_writable())
 208                         if (--timeout <= 0)
 209                                 break;
 210                 if (timeout <= 0) {
 211                         oops();
 212                         break;
 213                 }
 214                 spin_lock_irqsave(&speakup_info.spinlock, flags);
 215                 ch = synth_buffer_getc();
 216                 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 217                 if (ch == '\n')
 218                         ch = PROCSPEECH;
 219                 outb_p(ch, synth_port);
 220                 SWAIT;
 221                 if (time_after_eq(jiffies, jiff_max) && (ch == SPACE)) {
 222                         timeout = 1000;
 223                         while (synth_writable())
 224                                 if (--timeout <= 0)
 225                                         break;
 226                         if (timeout <= 0) {
 227                                 oops();
 228                                 break;
 229                         }
 230                         outb_p(PROCSPEECH, synth_port);
 231                         spin_lock_irqsave(&speakup_info.spinlock, flags);
 232                         jiffy_delta_val = jiffy_delta->u.n.value;
 233                         delay_time_val = delay_time->u.n.value;
 234                         spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 235                         schedule_timeout(msecs_to_jiffies(delay_time_val));
 236                         jiff_max = jiffies + jiffy_delta_val;
 237                 }
 238         }
 239         timeout = 1000;
 240         while (synth_writable())
 241                 if (--timeout <= 0)
 242                         break;
 243         if (timeout <= 0)
 244                 oops();
 245         else
 246                 outb_p(PROCSPEECH, synth_port);
 247 }
 248
 249 static void synth_flush(struct spk_synth *synth)
 250 {
 251         outb_p(SYNTH_CLEAR, synth_port);
 252 }
 253
 254 static int synth_probe(struct spk_synth *synth)
 255 {
 256         unsigned int port_val = 0;
 257         int i = 0;
 258
 259         pr_info("Probing for %s.\n", synth->long_name);
 260         if (port_forced) {
 261                 synth_port = port_forced;
 262                 pr_info("probe forced to %x by kernel command line\n",
 263                         synth_port);
 264                 if (synth_request_region(synth_port - 1, SYNTH_IO_EXTENT)) {
 265                         pr_warn("sorry, port already reserved\n");
 266                         return -EBUSY;
 267                 }
 268                 port_val = inb(synth_port);
 269         } else {
 270                 for (i = 0; synth_portlist[i]; i++) {
 271                         if (synth_request_region(synth_portlist[i],
 272                                                  SYNTH_IO_EXTENT)) {
 273                                 pr_warn
 274                                     ("request_region: failed with 0x%x, %d\n",
 275                                      synth_portlist[i], SYNTH_IO_EXTENT);
 276                                 continue;
 277                         }
 278                         port_val = inb(synth_portlist[i]);
 279                         if (port_val == 0x80) {
 280                                 synth_port = synth_portlist[i];
 281                                 break;
 282                         }
 283                 }
 284         }
 285         if (port_val != 0x80) {
 286                 pr_info("%s: not found\n", synth->long_name);
 287                 synth_release_region(synth_port, SYNTH_IO_EXTENT);
 288                 synth_port = 0;
 289                 return -ENODEV;
 290         }
 291         pr_info("%s: %03x-%03x, driver version %s,\n", synth->long_name,
 292                 synth_port, synth_port + SYNTH_IO_EXTENT - 1,
 293                 synth->version);
 294         synth->alive = 1;
 295         return 0;
 296 }
 297
 298 static void keynote_release(struct spk_synth *synth)
 299 {
 300         spk_stop_serial_interrupt();
 301         if (synth_port)
 302                 synth_release_region(synth_port, SYNTH_IO_EXTENT);
 303         synth_port = 0;
 304 }
 305
 306 module_param_hw_named(port, port_forced, int, ioport, 0444);
 307 module_param_named(start, synth_keypc.startup, short, 0444);
 308
 309 MODULE_PARM_DESC(port, "Set the port for the synthesizer (override probing).");
 310 MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
 311
 312 module_spk_synth(synth_keypc);
 313
 314 MODULE_AUTHOR("David Borowski");
 315 MODULE_DESCRIPTION("Speakup support for Keynote Gold PC synthesizers");
 316 MODULE_LICENSE("GPL");
 317 MODULE_VERSION(DRV_VERSION);
 318