Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
/* speakup_soft.c - speakup driver to register and make available
 * a user space device for software synthesizers.  written by: Kirk
 * Reiser <kirk@braille.uwo.ca>
 *
 * Copyright (C) 2003  Kirk Reiser.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * this code is specificly written as a driver for the speakup screenreview
 * package and is not a general device driver.
 */

#include <linux/unistd.h>
#include <linux/miscdevice.h>	/* for misc_register, and SYNTH_MINOR */
#include <linux/poll.h>		/* for poll_wait() */
#include <linux/sched/signal.h> /* schedule(), signal_pending(), TASK_INTERRUPTIBLE */

#include "spk_priv.h"
#include "speakup.h"

#define DRV_VERSION "2.6"
#define SOFTSYNTH_MINOR 26 /* might as well give it one more than /dev/synth */
#define SOFTSYNTHU_MINOR 27 /* might as well give it one more than /dev/synth */
#define PROCSPEECH 0x0d
#define CLEAR_SYNTH 0x18

static int softsynth_probe(struct spk_synth *synth);
static void softsynth_release(void);
static int softsynth_is_alive(struct spk_synth *synth);
static unsigned char get_index(struct spk_synth *synth);

static struct miscdevice synth_device, synthu_device;
static int init_pos;
static int misc_registered;

static struct var_t vars[] = {
	{ CAPS_START, .u.s = {"\x01+3p" } },
	{ CAPS_STOP, .u.s = {"\x01-3p" } },
	{ RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } },
	{ PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } },
	{ VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
	{ TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
	{ PUNCT, .u.n = {"\x01%db", 0, 0, 2, 0, 0, NULL } },
	{ VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
	{ FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
	{ DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
	V_LAST_VAR
};

/* These attributes will appear in /sys/accessibility/speakup/soft. */

static struct kobj_attribute caps_start_attribute =
	__ATTR(caps_start, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute caps_stop_attribute =
	__ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute freq_attribute =
	__ATTR(freq, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute pitch_attribute =
	__ATTR(pitch, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute punct_attribute =
	__ATTR(punct, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute rate_attribute =
	__ATTR(rate, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute tone_attribute =
	__ATTR(tone, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute voice_attribute =
	__ATTR(voice, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute vol_attribute =
	__ATTR(vol, 0644, spk_var_show, spk_var_store);

/*
 * We should uncomment the following definition, when we agree on a
 * method of passing a language designation to the software synthesizer.
 * static struct kobj_attribute lang_attribute =
 *	__ATTR(lang, 0644, spk_var_show, spk_var_store);
 */

static struct kobj_attribute delay_time_attribute =
	__ATTR(delay_time, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute direct_attribute =
	__ATTR(direct, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute full_time_attribute =
	__ATTR(full_time, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute jiffy_delta_attribute =
	__ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute trigger_time_attribute =
	__ATTR(trigger_time, 0644, spk_var_show, spk_var_store);

/*
 * Create a group of attributes so that we can create and destroy them all
 * at once.
 */
static struct attribute *synth_attrs[] = {
	&caps_start_attribute.attr,
	&caps_stop_attribute.attr,
	&freq_attribute.attr,
/*	&lang_attribute.attr, */
	&pitch_attribute.attr,
	&punct_attribute.attr,
	&rate_attribute.attr,
	&tone_attribute.attr,
	&voice_attribute.attr,
	&vol_attribute.attr,
	&delay_time_attribute.attr,
	&direct_attribute.attr,
	&full_time_attribute.attr,
	&jiffy_delta_attribute.attr,
	&trigger_time_attribute.attr,
	NULL,	/* need to NULL terminate the list of attributes */
};

static struct spk_synth synth_soft = {
	.name = "soft",
	.version = DRV_VERSION,
	.long_name = "software synth",
	.init = "\01@\x01\x31y\n",
	.procspeech = PROCSPEECH,
	.delay = 0,
	.trigger = 0,
	.jiffies = 0,
	.full = 0,
	.startup = SYNTH_START,
	.checkval = SYNTH_CHECK,
	.vars = vars,
	.io_ops = NULL,
	.probe = softsynth_probe,
	.release = softsynth_release,
	.synth_immediate = NULL,
	.catch_up = NULL,
	.flush = NULL,
	.is_alive = softsynth_is_alive,
	.synth_adjust = NULL,
	.read_buff_add = NULL,
	.get_index = get_index,
	.indexing = {
		.command = "\x01%di",
		.lowindex = 1,
		.highindex = 5,
		.currindex = 1,
	},
	.attributes = {
		.attrs = synth_attrs,
		.name = "soft",
	},
};

static char *get_initstring(void)
{
	static char buf[40];
	char *cp;
	struct var_t *var;

	memset(buf, 0, sizeof(buf));
	cp = buf;
	var = synth_soft.vars;
	while (var->var_id != MAXVARS) {
		if (var->var_id != CAPS_START && var->var_id != CAPS_STOP &&
		    var->var_id != DIRECT)
			cp = cp + sprintf(cp, var->u.n.synth_fmt,
					  var->u.n.value);
		var++;
	}
	cp = cp + sprintf(cp, "\n");
	return buf;
}

static int softsynth_open(struct inode *inode, struct file *fp)
{
	unsigned long flags;
	/*if ((fp->f_flags & O_ACCMODE) != O_RDONLY) */
	/*	return -EPERM; */
	spin_lock_irqsave(&speakup_info.spinlock, flags);
	if (synth_soft.alive) {
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
		return -EBUSY;
	}
	synth_soft.alive = 1;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return 0;
}

static int softsynth_close(struct inode *inode, struct file *fp)
{
	unsigned long flags;

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	synth_soft.alive = 0;
	init_pos = 0;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	/* Make sure we let applications go before leaving */
	speakup_start_ttys();
	return 0;
}

static ssize_t softsynthx_read(struct file *fp, char __user *buf, size_t count,
			       loff_t *pos, int unicode)
{
	int chars_sent = 0;
	char __user *cp;
	char *init;
	u16 ch;
	int empty;
	unsigned long flags;
	DEFINE_WAIT(wait);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	while (1) {
		prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
		if (!unicode)
			synth_buffer_skip_nonlatin1();
		if (!synth_buffer_empty() || speakup_info.flushing)
			break;
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
		if (fp->f_flags & O_NONBLOCK) {
			finish_wait(&speakup_event, &wait);
			return -EAGAIN;
		}
		if (signal_pending(current)) {
			finish_wait(&speakup_event, &wait);
			return -ERESTARTSYS;
		}
		schedule();
		spin_lock_irqsave(&speakup_info.spinlock, flags);
	}
	finish_wait(&speakup_event, &wait);

	cp = buf;
	init = get_initstring();

	/* Keep 3 bytes available for a 16bit UTF-8-encoded character */
	while (chars_sent <= count - 3) {
		if (speakup_info.flushing) {
			speakup_info.flushing = 0;
			ch = '\x18';
		} else if (init[init_pos]) {
			ch = init[init_pos++];
		} else {
			if (!unicode)
				synth_buffer_skip_nonlatin1();
			if (synth_buffer_empty())
				break;
			ch = synth_buffer_getc();
		}
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);

		if ((!unicode && ch < 0x100) || (unicode && ch < 0x80)) {
			u_char c = ch;

			if (copy_to_user(cp, &c, 1))
				return -EFAULT;

			chars_sent++;
			cp++;
		} else if (unicode && ch < 0x800) {
			u_char s[2] = {
				0xc0 | (ch >> 6),
				0x80 | (ch & 0x3f)
			};

			if (copy_to_user(cp, s, sizeof(s)))
				return -EFAULT;

			chars_sent += sizeof(s);
			cp += sizeof(s);
		} else if (unicode) {
			u_char s[3] = {
				0xe0 | (ch >> 12),
				0x80 | ((ch >> 6) & 0x3f),
				0x80 | (ch & 0x3f)
			};

			if (copy_to_user(cp, s, sizeof(s)))
				return -EFAULT;

			chars_sent += sizeof(s);
			cp += sizeof(s);
		}

		spin_lock_irqsave(&speakup_info.spinlock, flags);
	}
	*pos += chars_sent;
	empty = synth_buffer_empty();
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	if (empty) {
		speakup_start_ttys();
		*pos = 0;
	}
	return chars_sent;
}

static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
			      loff_t *pos)
{
	return softsynthx_read(fp, buf, count, pos, 0);
}

static ssize_t softsynthu_read(struct file *fp, char __user *buf, size_t count,
			       loff_t *pos)
{
	return softsynthx_read(fp, buf, count, pos, 1);
}

static int last_index;

static ssize_t softsynth_write(struct file *fp, const char __user *buf,
			       size_t count, loff_t *pos)
{
	unsigned long supplied_index = 0;
	int converted;

	converted = kstrtoul_from_user(buf, count, 0, &supplied_index);

	if (converted < 0)
		return converted;

	last_index = supplied_index;
	return count;
}

static unsigned int softsynth_poll(struct file *fp, struct poll_table_struct *wait)
{
	unsigned long flags;
	int ret = 0;

	poll_wait(fp, &speakup_event, wait);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	if (!synth_buffer_empty() || speakup_info.flushing)
		ret = POLLIN | POLLRDNORM;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return ret;
}

static unsigned char get_index(struct spk_synth *synth)
{
	int rv;

	rv = last_index;
	last_index = 0;
	return rv;
}

static const struct file_operations softsynth_fops = {
	.owner = THIS_MODULE,
	.poll = softsynth_poll,
	.read = softsynth_read,
	.write = softsynth_write,
	.open = softsynth_open,
	.release = softsynth_close,
};

static const struct file_operations softsynthu_fops = {
	.owner = THIS_MODULE,
	.poll = softsynth_poll,
	.read = softsynthu_read,
	.write = softsynth_write,
	.open = softsynth_open,
	.release = softsynth_close,
};

static int softsynth_probe(struct spk_synth *synth)
{
	if (misc_registered != 0)
		return 0;
	memset(&synth_device, 0, sizeof(synth_device));
	synth_device.minor = SOFTSYNTH_MINOR;
	synth_device.name = "softsynth";
	synth_device.fops = &softsynth_fops;
	if (misc_register(&synth_device)) {
		pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
		return -ENODEV;
	}

	memset(&synthu_device, 0, sizeof(synthu_device));
	synthu_device.minor = SOFTSYNTHU_MINOR;
	synthu_device.name = "softsynthu";
	synthu_device.fops = &softsynthu_fops;
	if (misc_register(&synthu_device)) {
		pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
		return -ENODEV;
	}

	misc_registered = 1;
	pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR 26)\n");
	pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR 27)\n");
	return 0;
}

static void softsynth_release(void)
{
	misc_deregister(&synth_device);
	misc_deregister(&synthu_device);
	misc_registered = 0;
	pr_info("unregistered /dev/softsynth\n");
	pr_info("unregistered /dev/softsynthu\n");
}

static int softsynth_is_alive(struct spk_synth *synth)
{
	if (synth_soft.alive)
		return 1;
	return 0;
}

module_param_named(start, synth_soft.startup, short, 0444);

MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");

module_spk_synth(synth_soft);

MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
MODULE_DESCRIPTION("Speakup userspace software synthesizer support");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);