Release 4.18 drivers/staging/speakup/buffers.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/console.h>
#include <linux/types.h>
#include <linux/wait.h>

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


#define SYNTH_BUF_SIZE 8192	
/* currently 8K bytes */


static u16 synth_buffer[SYNTH_BUF_SIZE];	
/* guess what this is for! */

static u16 *buff_in = synth_buffer;

static u16 *buff_out = synth_buffer;

static u16 *buffer_end = synth_buffer + SYNTH_BUF_SIZE - 1;

/* These try to throttle applications by stopping the TTYs
 * Note: we need to make sure that we will restart them eventually, which is
 * usually not possible to do from the notifiers. TODO: it should be possible
 * starting from linux 2.6.26.
 *
 * So we only stop when we know alive == 1 (else we discard the data anyway),
 * and the alive synth will eventually call start_ttys from the thread context.
 */


void speakup_start_ttys(void)
{
	int i;

	for (i = 0; i < MAX_NR_CONSOLES; i++) {
		if (speakup_console[i] && speakup_console[i]->tty_stopped)
			continue;
		if (vc_cons[i].d && vc_cons[i].d->port.tty)
			start_tty(vc_cons[i].d->port.tty);
	}
}
Contributors
Person
Tokens
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CommitProp
William Hubbs
68
91.89%
1
50.00%
Greg Kroah-Hartman
6
8.11%
1
50.00%
Total
74
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(speakup_start_ttys);



static void speakup_stop_ttys(void)
{
	int i;

	for (i = 0; i < MAX_NR_CONSOLES; i++)
		if (vc_cons[i].d && vc_cons[i].d->port.tty)
			stop_tty(vc_cons[i].d->port.tty);
}

Contributors
Person
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Prop
Commits
CommitProp
William Hubbs
52
89.66%
1
50.00%
Greg Kroah-Hartman
6
10.34%
1
50.00%
Total
58
100.00%
2
100.00%



static int synth_buffer_free(void)
{
	int chars_free;

	if (buff_in >= buff_out)
		chars_free = SYNTH_BUF_SIZE - (buff_in - buff_out);
	else
		chars_free = buff_out - buff_in;
	return chars_free;
}

Contributors
Person
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Prop
Commits
CommitProp
William Hubbs
32
86.49%
1
33.33%
Samuel Thibault
4
10.81%
1
33.33%
Lijo Antony
1
2.70%
1
33.33%
Total
37
100.00%
3
100.00%



int synth_buffer_empty(void)
{
	return (buff_in == buff_out);
}
Contributors
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CommitProp
William Hubbs
14
100.00%
1
100.00%
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14
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(synth_buffer_empty);



void synth_buffer_add(u16 ch)
{
	if (!synth->alive) {
		/* This makes sure that we won't stop TTYs if there is no synth
                 * to restart them
                 */
		return;
	}
	if (synth_buffer_free() <= 100) {
		synth_start();
		speakup_stop_ttys();
	}
	if (synth_buffer_free() <= 1)
		return;
	*buff_in++ = ch;
	if (buff_in > buffer_end)
		buff_in = synth_buffer;
	/* We have written something to the speech synthesis, so we are not
         * paused any more.
         */
	spk_paused = false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
William Hubbs
56
88.89%
1
16.67%
Samuel Thibault
6
9.52%
4
66.67%
Aleksei Fedotov
1
1.59%
1
16.67%
Total
63
100.00%
6
100.00%



u16 synth_buffer_getc(void)
{
	u16 ch;

	if (buff_out == buff_in)
		return 0;
	ch = *buff_out++;
	if (buff_out > buffer_end)
		buff_out = synth_buffer;
	return ch;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
William Hubbs
36
94.74%
1
50.00%
Samuel Thibault
2
5.26%
1
50.00%
Total
38
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(synth_buffer_getc);



u16 synth_buffer_peek(void)
{
	if (buff_out == buff_in)
		return 0;
	return *buff_out;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
William Hubbs
19
95.00%
1
50.00%
Samuel Thibault
1
5.00%
1
50.00%
Total
20
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(synth_buffer_peek);



void synth_buffer_skip_nonlatin1(void)
{
	while (buff_out != buff_in) {
		if (*buff_out < 0x100)
			return;
		buff_out++;
		if (buff_out > buffer_end)
			buff_out = synth_buffer;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Samuel Thibault
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(synth_buffer_skip_nonlatin1);



void synth_buffer_clear(void)
{
	buff_in = synth_buffer;
	buff_out = synth_buffer;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
William Hubbs
13
86.67%
1
50.00%
Burcin Akalin
2
13.33%
1
50.00%
Total
15
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(synth_buffer_clear);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
William Hubbs
362
82.27%
1
10.00%
Samuel Thibault
58
13.18%
4
40.00%
Greg Kroah-Hartman
13
2.95%
2
20.00%
Lijo Antony
4
0.91%
1
10.00%
Burcin Akalin
2
0.45%
1
10.00%
Aleksei Fedotov
1
0.23%
1
10.00%
Total
440
100.00%
10
100.00%
Directory: drivers/staging/speakup

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