1 // SPDX-License-Identifier: GPL-2.0+
2 /* speakup_soft.c - speakup driver to register and make available
3 * a user space device for software synthesizers. written by: Kirk
4 * Reiser <kirk@braille.uwo.ca>
5 *
6 * Copyright (C) 2003 Kirk Reiser.
7 *
8 * this code is specifically written as a driver for the speakup screenreview
9 * package and is not a general device driver.
10 */
11
12 #include <linux/unistd.h>
13 #include <linux/miscdevice.h> /* for misc_register, and MISC_DYNAMIC_MINOR */
14 #include <linux/poll.h> /* for poll_wait() */
15
16 /* schedule(), signal_pending(), TASK_INTERRUPTIBLE */
17 #include <linux/sched/signal.h>
18
19 #include "spk_priv.h"
20 #include "speakup.h"
21
22 #define DRV_VERSION "2.6"
23 #define PROCSPEECH 0x0d
24 #define CLEAR_SYNTH 0x18
25
26 static int softsynth_probe(struct spk_synth *synth);
27 static void softsynth_release(struct spk_synth *synth);
28 static int softsynth_is_alive(struct spk_synth *synth);
29 static int softsynth_adjust(struct spk_synth *synth, struct st_var_header *var);
30 static unsigned char get_index(struct spk_synth *synth);
31
32 static struct miscdevice synth_device, synthu_device;
33 static int init_pos;
34 static int misc_registered;
35
36
37 enum default_vars_id {
38 DIRECT_ID = 0, CAPS_START_ID, CAPS_STOP_ID,
39 PAUSE_ID, RATE_ID, PITCH_ID, INFLECTION_ID,
40 VOL_ID, TONE_ID, PUNCT_ID, VOICE_ID,
41 FREQUENCY_ID, V_LAST_VAR_ID,
42 NB_ID
43 };
44
45
46 static struct var_t vars[NB_ID] = {
47
48 [DIRECT_ID] = { DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
49 [CAPS_START_ID] = { CAPS_START, .u.s = {"\x01+3p" } },
50 [CAPS_STOP_ID] = { CAPS_STOP, .u.s = {"\x01-3p" } },
51 [PAUSE_ID] = { PAUSE, .u.n = {"\x01P" } },
52 [RATE_ID] = { RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } },
53 [PITCH_ID] = { PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } },
54 [INFLECTION_ID] = { INFLECTION, .u.n = {"\x01%dr", 5, 0, 9, 0, 0, NULL } },
55 [VOL_ID] = { VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
56 [TONE_ID] = { TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
57 [PUNCT_ID] = { PUNCT, .u.n = {"\x01%db", 0, 0, 3, 0, 0, NULL } },
58 [VOICE_ID] = { VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
59 [FREQUENCY_ID] = { FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
60 V_LAST_VAR
61 };
62
63 /* These attributes will appear in /sys/accessibility/speakup/soft. */
64
65 static struct kobj_attribute caps_start_attribute =
66 __ATTR(caps_start, 0644, spk_var_show, spk_var_store);
67 static struct kobj_attribute caps_stop_attribute =
68 __ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
69 static struct kobj_attribute freq_attribute =
70 __ATTR(freq, 0644, spk_var_show, spk_var_store);
71 static struct kobj_attribute pitch_attribute =
72 __ATTR(pitch, 0644, spk_var_show, spk_var_store);
73 static struct kobj_attribute inflection_attribute =
74 __ATTR(inflection, 0644, spk_var_show, spk_var_store);
75 static struct kobj_attribute punct_attribute =
76 __ATTR(punct, 0644, spk_var_show, spk_var_store);
77 static struct kobj_attribute rate_attribute =
78 __ATTR(rate, 0644, spk_var_show, spk_var_store);
79 static struct kobj_attribute tone_attribute =
80 __ATTR(tone, 0644, spk_var_show, spk_var_store);
81 static struct kobj_attribute voice_attribute =
82 __ATTR(voice, 0644, spk_var_show, spk_var_store);
83 static struct kobj_attribute vol_attribute =
84 __ATTR(vol, 0644, spk_var_show, spk_var_store);
85
86 /*
87 * We should uncomment the following definition, when we agree on a
88 * method of passing a language designation to the software synthesizer.
89 * static struct kobj_attribute lang_attribute =
90 * __ATTR(lang, 0644, spk_var_show, spk_var_store);
91 */
92
93 static struct kobj_attribute delay_time_attribute =
94 __ATTR(delay_time, 0644, spk_var_show, spk_var_store);
95 static struct kobj_attribute direct_attribute =
96 __ATTR(direct, 0644, spk_var_show, spk_var_store);
97 static struct kobj_attribute full_time_attribute =
98 __ATTR(full_time, 0644, spk_var_show, spk_var_store);
99 static struct kobj_attribute jiffy_delta_attribute =
100 __ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
101 static struct kobj_attribute trigger_time_attribute =
102 __ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
103
104 /*
105 * Create a group of attributes so that we can create and destroy them all
106 * at once.
107 */
108 static struct attribute *synth_attrs[] = {
109 &caps_start_attribute.attr,
110 &caps_stop_attribute.attr,
111 &freq_attribute.attr,
112 /* &lang_attribute.attr, */
113 &pitch_attribute.attr,
114 &inflection_attribute.attr,
115 &punct_attribute.attr,
116 &rate_attribute.attr,
117 &tone_attribute.attr,
118 &voice_attribute.attr,
119 &vol_attribute.attr,
120 &delay_time_attribute.attr,
121 &direct_attribute.attr,
122 &full_time_attribute.attr,
123 &jiffy_delta_attribute.attr,
124 &trigger_time_attribute.attr,
125 NULL, /* need to NULL terminate the list of attributes */
126 };
127
128 static struct spk_synth synth_soft = {
129 .name = "soft",
130 .version = DRV_VERSION,
131 .long_name = "software synth",
132 .init = "\01@\x01\x31y\n",
133 .procspeech = PROCSPEECH,
134 .delay = 0,
135 .trigger = 0,
136 .jiffies = 0,
137 .full = 0,
138 .startup = SYNTH_START,
139 .checkval = SYNTH_CHECK,
140 .vars = vars,
141 .io_ops = NULL,
142 .probe = softsynth_probe,
143 .release = softsynth_release,
144 .synth_immediate = NULL,
145 .catch_up = NULL,
146 .flush = NULL,
147 .is_alive = softsynth_is_alive,
148 .synth_adjust = softsynth_adjust,
149 .read_buff_add = NULL,
150 .get_index = get_index,
151 .indexing = {
152 .command = "\x01%di",
153 .lowindex = 1,
154 .highindex = 5,
155 .currindex = 1,
156 },
157 .attributes = {
158 .attrs = synth_attrs,
159 .name = "soft",
160 },
161 };
162
get_initstring(void)163 static char *get_initstring(void)
164 {
165 static char buf[40];
166 char *cp;
167 struct var_t *var;
168 size_t len;
169 size_t n;
170
171 memset(buf, 0, sizeof(buf));
172 cp = buf;
173 len = sizeof(buf);
174
175 var = synth_soft.vars;
176 while (var->var_id != MAXVARS) {
177 if (var->var_id != CAPS_START && var->var_id != CAPS_STOP &&
178 var->var_id != PAUSE && var->var_id != DIRECT) {
179 n = scnprintf(cp, len, var->u.n.synth_fmt,
180 var->u.n.value);
181 cp = cp + n;
182 len = len - n;
183 }
184 var++;
185 }
186 cp = cp + scnprintf(cp, len, "\n");
187 return buf;
188 }
189
softsynth_open(struct inode * inode,struct file * fp)190 static int softsynth_open(struct inode *inode, struct file *fp)
191 {
192 unsigned long flags;
193 /*if ((fp->f_flags & O_ACCMODE) != O_RDONLY) */
194 /* return -EPERM; */
195 spin_lock_irqsave(&speakup_info.spinlock, flags);
196 if (synth_soft.alive) {
197 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
198 return -EBUSY;
199 }
200 synth_soft.alive = 1;
201 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
202 return 0;
203 }
204
softsynth_close(struct inode * inode,struct file * fp)205 static int softsynth_close(struct inode *inode, struct file *fp)
206 {
207 unsigned long flags;
208
209 spin_lock_irqsave(&speakup_info.spinlock, flags);
210 synth_soft.alive = 0;
211 init_pos = 0;
212 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
213 /* Make sure we let applications go before leaving */
214 speakup_start_ttys();
215 return 0;
216 }
217
softsynthx_read(struct file * fp,char __user * buf,size_t count,loff_t * pos,int unicode)218 static ssize_t softsynthx_read(struct file *fp, char __user *buf, size_t count,
219 loff_t *pos, int unicode)
220 {
221 int chars_sent = 0;
222 char __user *cp;
223 char *init;
224 size_t bytes_per_ch = unicode ? 3 : 1;
225 u16 ch;
226 int empty;
227 unsigned long flags;
228 DEFINE_WAIT(wait);
229
230 if (count < bytes_per_ch)
231 return -EINVAL;
232
233 spin_lock_irqsave(&speakup_info.spinlock, flags);
234 synth_soft.alive = 1;
235 while (1) {
236 prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
237 if (synth_current() == &synth_soft) {
238 if (!unicode)
239 synth_buffer_skip_nonlatin1();
240 if (!synth_buffer_empty() || speakup_info.flushing)
241 break;
242 }
243 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
244 if (fp->f_flags & O_NONBLOCK) {
245 finish_wait(&speakup_event, &wait);
246 return -EAGAIN;
247 }
248 if (signal_pending(current)) {
249 finish_wait(&speakup_event, &wait);
250 return -ERESTARTSYS;
251 }
252 schedule();
253 spin_lock_irqsave(&speakup_info.spinlock, flags);
254 }
255 finish_wait(&speakup_event, &wait);
256
257 cp = buf;
258 init = get_initstring();
259
260 /* Keep 3 bytes available for a 16bit UTF-8-encoded character */
261 while (chars_sent <= count - bytes_per_ch) {
262 if (synth_current() != &synth_soft)
263 break;
264 if (speakup_info.flushing) {
265 speakup_info.flushing = 0;
266 ch = '\x18';
267 } else if (init[init_pos]) {
268 ch = init[init_pos++];
269 } else {
270 if (!unicode)
271 synth_buffer_skip_nonlatin1();
272 if (synth_buffer_empty())
273 break;
274 ch = synth_buffer_getc();
275 }
276 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
277
278 if ((!unicode && ch < 0x100) || (unicode && ch < 0x80)) {
279 u_char c = ch;
280
281 if (copy_to_user(cp, &c, 1))
282 return -EFAULT;
283
284 chars_sent++;
285 cp++;
286 } else if (unicode && ch < 0x800) {
287 u_char s[2] = {
288 0xc0 | (ch >> 6),
289 0x80 | (ch & 0x3f)
290 };
291
292 if (copy_to_user(cp, s, sizeof(s)))
293 return -EFAULT;
294
295 chars_sent += sizeof(s);
296 cp += sizeof(s);
297 } else if (unicode) {
298 u_char s[3] = {
299 0xe0 | (ch >> 12),
300 0x80 | ((ch >> 6) & 0x3f),
301 0x80 | (ch & 0x3f)
302 };
303
304 if (copy_to_user(cp, s, sizeof(s)))
305 return -EFAULT;
306
307 chars_sent += sizeof(s);
308 cp += sizeof(s);
309 }
310
311 spin_lock_irqsave(&speakup_info.spinlock, flags);
312 }
313 *pos += chars_sent;
314 empty = synth_buffer_empty();
315 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
316 if (empty) {
317 speakup_start_ttys();
318 *pos = 0;
319 }
320 return chars_sent;
321 }
322
softsynth_read(struct file * fp,char __user * buf,size_t count,loff_t * pos)323 static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
324 loff_t *pos)
325 {
326 return softsynthx_read(fp, buf, count, pos, 0);
327 }
328
softsynthu_read(struct file * fp,char __user * buf,size_t count,loff_t * pos)329 static ssize_t softsynthu_read(struct file *fp, char __user *buf, size_t count,
330 loff_t *pos)
331 {
332 return softsynthx_read(fp, buf, count, pos, 1);
333 }
334
335 static int last_index;
336
softsynth_write(struct file * fp,const char __user * buf,size_t count,loff_t * pos)337 static ssize_t softsynth_write(struct file *fp, const char __user *buf,
338 size_t count, loff_t *pos)
339 {
340 unsigned long supplied_index = 0;
341 int converted;
342
343 converted = kstrtoul_from_user(buf, count, 0, &supplied_index);
344
345 if (converted < 0)
346 return converted;
347
348 last_index = supplied_index;
349 return count;
350 }
351
softsynth_poll(struct file * fp,struct poll_table_struct * wait)352 static __poll_t softsynth_poll(struct file *fp, struct poll_table_struct *wait)
353 {
354 unsigned long flags;
355 __poll_t ret = 0;
356
357 poll_wait(fp, &speakup_event, wait);
358
359 spin_lock_irqsave(&speakup_info.spinlock, flags);
360 if (synth_current() == &synth_soft &&
361 (!synth_buffer_empty() || speakup_info.flushing))
362 ret = EPOLLIN | EPOLLRDNORM;
363 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
364 return ret;
365 }
366
get_index(struct spk_synth * synth)367 static unsigned char get_index(struct spk_synth *synth)
368 {
369 int rv;
370
371 rv = last_index;
372 last_index = 0;
373 return rv;
374 }
375
376 static const struct file_operations softsynth_fops = {
377 .owner = THIS_MODULE,
378 .poll = softsynth_poll,
379 .read = softsynth_read,
380 .write = softsynth_write,
381 .open = softsynth_open,
382 .release = softsynth_close,
383 };
384
385 static const struct file_operations softsynthu_fops = {
386 .owner = THIS_MODULE,
387 .poll = softsynth_poll,
388 .read = softsynthu_read,
389 .write = softsynth_write,
390 .open = softsynth_open,
391 .release = softsynth_close,
392 };
393
softsynth_probe(struct spk_synth * synth)394 static int softsynth_probe(struct spk_synth *synth)
395 {
396 if (misc_registered != 0)
397 return 0;
398 memset(&synth_device, 0, sizeof(synth_device));
399 synth_device.minor = MISC_DYNAMIC_MINOR;
400 synth_device.name = "softsynth";
401 synth_device.fops = &softsynth_fops;
402 if (misc_register(&synth_device)) {
403 pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
404 return -ENODEV;
405 }
406
407 memset(&synthu_device, 0, sizeof(synthu_device));
408 synthu_device.minor = MISC_DYNAMIC_MINOR;
409 synthu_device.name = "softsynthu";
410 synthu_device.fops = &softsynthu_fops;
411 if (misc_register(&synthu_device)) {
412 misc_deregister(&synth_device);
413 pr_warn("Couldn't initialize miscdevice /dev/softsynthu.\n");
414 return -ENODEV;
415 }
416
417 misc_registered = 1;
418 pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR %d)\n",
419 synth_device.minor);
420 pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR %d)\n",
421 synthu_device.minor);
422 return 0;
423 }
424
softsynth_release(struct spk_synth * synth)425 static void softsynth_release(struct spk_synth *synth)
426 {
427 misc_deregister(&synth_device);
428 misc_deregister(&synthu_device);
429 misc_registered = 0;
430 pr_info("unregistered /dev/softsynth\n");
431 pr_info("unregistered /dev/softsynthu\n");
432 }
433
softsynth_is_alive(struct spk_synth * synth)434 static int softsynth_is_alive(struct spk_synth *synth)
435 {
436 if (synth_soft.alive)
437 return 1;
438 return 0;
439 }
440
softsynth_adjust(struct spk_synth * synth,struct st_var_header * var)441 static int softsynth_adjust(struct spk_synth *synth, struct st_var_header *var)
442 {
443 struct st_var_header *punc_level_var;
444 struct var_t *var_data;
445
446 if (var->var_id != PUNC_LEVEL)
447 return 0;
448
449 /* We want to set the the speech synthesis punctuation level
450 * accordingly, so it properly tunes speaking A_PUNC characters */
451 var_data = var->data;
452 if (!var_data)
453 return 0;
454 punc_level_var = spk_get_var_header(PUNCT);
455 if (!punc_level_var)
456 return 0;
457 spk_set_num_var(var_data->u.n.value, punc_level_var, E_SET);
458
459 return 1;
460 }
461
462 module_param_named(start, synth_soft.startup, short, 0444);
463 module_param_named(direct, vars[DIRECT_ID].u.n.default_val, int, 0444);
464 module_param_named(rate, vars[RATE_ID].u.n.default_val, int, 0444);
465 module_param_named(pitch, vars[PITCH_ID].u.n.default_val, int, 0444);
466 module_param_named(inflection, vars[INFLECTION_ID].u.n.default_val, int, 0444);
467 module_param_named(vol, vars[VOL_ID].u.n.default_val, int, 0444);
468 module_param_named(tone, vars[TONE_ID].u.n.default_val, int, 0444);
469 module_param_named(punct, vars[PUNCT_ID].u.n.default_val, int, 0444);
470 module_param_named(voice, vars[VOICE_ID].u.n.default_val, int, 0444);
471 module_param_named(frequency, vars[FREQUENCY_ID].u.n.default_val, int, 0444);
472
473
474
475 MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
476 MODULE_PARM_DESC(direct, "Set the direct variable on load.");
477 MODULE_PARM_DESC(rate, "Sets the rate of the synthesizer.");
478 MODULE_PARM_DESC(pitch, "Sets the pitch of the synthesizer.");
479 MODULE_PARM_DESC(inflection, "Sets the inflection of the synthesizer.");
480 MODULE_PARM_DESC(vol, "Sets the volume of the speech synthesizer.");
481 MODULE_PARM_DESC(tone, "Sets the tone of the speech synthesizer.");
482 MODULE_PARM_DESC(punct, "Sets the amount of punctuation spoken by the synthesizer.");
483 MODULE_PARM_DESC(voice, "Sets the voice used by the synthesizer.");
484 MODULE_PARM_DESC(frequency, "Sets the frequency of speech synthesizer.");
485
486 module_spk_synth(synth_soft);
487
488 MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
489 MODULE_DESCRIPTION("Speakup userspace software synthesizer support");
490 MODULE_LICENSE("GPL");
491 MODULE_VERSION(DRV_VERSION);
492