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// SPDX-License-Identifier: GPL-2.0
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include "spk_types.h"
#include "speakup.h"
#include "spk_priv.h"
#include "serialio.h"
#include <linux/serial_core.h>
#include <linux/serial.h>
static int timeouts;
static int spk_serial_out(struct spk_synth *in_synth, const char ch);
static void spk_serial_send_xchar(struct spk_synth *in_synth, char ch);
static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear);
static unsigned char spk_serial_in(struct spk_synth *in_synth);
static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth);
static void spk_serial_flush_buffer(struct spk_synth *in_synth);
static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth);
struct spk_io_ops spk_serial_io_ops = {
.synth_out = spk_serial_out,
.send_xchar = spk_serial_send_xchar,
.tiocmset = spk_serial_tiocmset,
.synth_in = spk_serial_in,
.synth_in_nowait = spk_serial_in_nowait,
.flush_buffer = spk_serial_flush_buffer,
.wait_for_xmitr = spk_serial_wait_for_xmitr,
};
EXPORT_SYMBOL_GPL(spk_serial_io_ops);
static void spk_serial_send_xchar(struct spk_synth *synth, char ch)
{
int timeout = SPK_XMITR_TIMEOUT;
while (spk_serial_tx_busy()) {
if (!--timeout)
break;
udelay(1);
}
outb(ch, speakup_info.port_tts);
}
static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear)
{
int old = inb(speakup_info.port_tts + UART_MCR);
outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);
}
static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth)
{
int tmout = SPK_XMITR_TIMEOUT;
if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
pr_warn("%s: too many timeouts, deactivating speakup\n",
in_synth->long_name);
in_synth->alive = 0;
/* No synth any more, so nobody will restart TTYs, and we thus
* need to do it ourselves. Now that there is no synth we can
* let application flood anyway
*/
speakup_start_ttys();
timeouts = 0;
return 0;
}
while (spk_serial_tx_busy()) {
if (--tmout == 0) {
pr_warn("%s: timed out (tx busy)\n",
in_synth->long_name);
timeouts++;
return 0;
}
udelay(1);
}
tmout = SPK_CTS_TIMEOUT;
while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
/* CTS */
if (--tmout == 0) {
timeouts++;
return 0;
}
udelay(1);
}
timeouts = 0;
return 1;
}
static unsigned char spk_serial_in(struct spk_synth *in_synth)
{
int tmout = SPK_SERIAL_TIMEOUT;
while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
if (--tmout == 0) {
pr_warn("time out while waiting for input.\n");
return 0xff;
}
udelay(1);
}
return inb_p(speakup_info.port_tts + UART_RX);
}
static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth)
{
unsigned char lsr;
lsr = inb_p(speakup_info.port_tts + UART_LSR);
if (!(lsr & UART_LSR_DR))
return 0;
return inb_p(speakup_info.port_tts + UART_RX);
}
static void spk_serial_flush_buffer(struct spk_synth *in_synth)
{
/* TODO: flush the UART 16550 buffer */
}
static int spk_serial_out(struct spk_synth *in_synth, const char ch)
{
if (in_synth->alive && spk_serial_wait_for_xmitr(in_synth)) {
outb_p(ch, speakup_info.port_tts);
return 1;
}
return 0;
}
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