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6496922817
It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Fix up the remaining staging speakup files to have a proper SPDX identifier, based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: William Hubbs <w.d.hubbs@gmail.com> Cc: Chris Brannon <chris@the-brannons.com> Cc: Kirk Reiser <kirk@reisers.ca> Cc: Samuel Thibault <samuel.thibault@ens-lyon.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/console.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include "speakup.h"
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#include "spk_priv.h"
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#define SYNTH_BUF_SIZE 8192 /* currently 8K bytes */
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static u16 synth_buffer[SYNTH_BUF_SIZE]; /* guess what this is for! */
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static u16 *buff_in = synth_buffer;
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static u16 *buff_out = synth_buffer;
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static u16 *buffer_end = synth_buffer + SYNTH_BUF_SIZE - 1;
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/* These try to throttle applications by stopping the TTYs
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* Note: we need to make sure that we will restart them eventually, which is
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* usually not possible to do from the notifiers. TODO: it should be possible
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* starting from linux 2.6.26.
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*
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* So we only stop when we know alive == 1 (else we discard the data anyway),
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* and the alive synth will eventually call start_ttys from the thread context.
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*/
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void speakup_start_ttys(void)
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{
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int i;
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for (i = 0; i < MAX_NR_CONSOLES; i++) {
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if (speakup_console[i] && speakup_console[i]->tty_stopped)
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continue;
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if (vc_cons[i].d && vc_cons[i].d->port.tty)
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start_tty(vc_cons[i].d->port.tty);
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}
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}
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EXPORT_SYMBOL_GPL(speakup_start_ttys);
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static void speakup_stop_ttys(void)
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{
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int i;
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for (i = 0; i < MAX_NR_CONSOLES; i++)
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if (vc_cons[i].d && vc_cons[i].d->port.tty)
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stop_tty(vc_cons[i].d->port.tty);
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}
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static int synth_buffer_free(void)
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{
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int chars_free;
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if (buff_in >= buff_out)
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chars_free = SYNTH_BUF_SIZE - (buff_in - buff_out);
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else
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chars_free = buff_out - buff_in;
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return chars_free;
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}
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int synth_buffer_empty(void)
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{
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return (buff_in == buff_out);
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}
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EXPORT_SYMBOL_GPL(synth_buffer_empty);
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void synth_buffer_add(u16 ch)
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{
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if (!synth->alive) {
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/* This makes sure that we won't stop TTYs if there is no synth
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* to restart them
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*/
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return;
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}
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if (synth_buffer_free() <= 100) {
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synth_start();
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speakup_stop_ttys();
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}
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if (synth_buffer_free() <= 1)
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return;
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*buff_in++ = ch;
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if (buff_in > buffer_end)
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buff_in = synth_buffer;
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}
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u16 synth_buffer_getc(void)
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{
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u16 ch;
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if (buff_out == buff_in)
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return 0;
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ch = *buff_out++;
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if (buff_out > buffer_end)
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buff_out = synth_buffer;
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return ch;
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}
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EXPORT_SYMBOL_GPL(synth_buffer_getc);
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u16 synth_buffer_peek(void)
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{
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if (buff_out == buff_in)
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return 0;
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return *buff_out;
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}
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EXPORT_SYMBOL_GPL(synth_buffer_peek);
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void synth_buffer_skip_nonlatin1(void)
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{
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while (buff_out != buff_in) {
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if (*buff_out < 0x100)
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return;
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buff_out++;
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if (buff_out > buffer_end)
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buff_out = synth_buffer;
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}
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}
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EXPORT_SYMBOL_GPL(synth_buffer_skip_nonlatin1);
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void synth_buffer_clear(void)
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{
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buff_in = synth_buffer;
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buff_out = synth_buffer;
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}
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EXPORT_SYMBOL_GPL(synth_buffer_clear);
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