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/**
* @file evdev.c Input event device UI module
*
* Copyright (C) 2010 Creytiv.com
*/
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <re.h>
#include <baresip.h>
#include "print.h"
#define DEBUG_MODULE "evdev"
#define DEBUG_LEVEL 5
#include <re_dbg.h>
/* Note:
*
* KEY_NUMERIC_xyz added in linux kernel 2.6.28
*/
struct ui_st {
struct ui *ui; /* base class */
int fd;
ui_input_h *h;
void *arg;
};
static struct ui *evdev;
static char evdev_device[64] = "/dev/event0";
static void evdev_close(struct ui_st *st)
{
if (st->fd < 0)
return;
fd_close(st->fd);
(void)close(st->fd);
st->fd = -1;
}
static void evdev_destructor(void *arg)
{
struct ui_st *st = arg;
evdev_close(st);
mem_deref(st->ui);
}
static int code2ascii(uint16_t modifier, uint16_t code)
{
switch (code) {
case KEY_0: return '0';
case KEY_1: return '1';
case KEY_2: return '2';
case KEY_3: return KEY_LEFTSHIFT==modifier ? '#' : '3';
case KEY_4: return '4';
case KEY_5: return '5';
case KEY_6: return '6';
case KEY_7: return '7';
case KEY_8: return '8';
case KEY_9: return '9';
case KEY_BACKSPACE: return '\b';
case KEY_ENTER: return '\n';
case KEY_ESC: return 0x1b;
case KEY_KPASTERISK: return '*';
#ifdef KEY_NUMERIC_0
case KEY_NUMERIC_0: return '0';
#endif
#ifdef KEY_NUMERIC_1
case KEY_NUMERIC_1: return '1';
#endif
#ifdef KEY_NUMERIC_2
case KEY_NUMERIC_2: return '2';
#endif
#ifdef KEY_NUMERIC_3
case KEY_NUMERIC_3: return '3';
#endif
#ifdef KEY_NUMERIC_4
case KEY_NUMERIC_4: return '4';
#endif
#ifdef KEY_NUMERIC_5
case KEY_NUMERIC_5: return '5';
#endif
#ifdef KEY_NUMERIC_6
case KEY_NUMERIC_6: return '6';
#endif
#ifdef KEY_NUMERIC_7
case KEY_NUMERIC_7: return '7';
#endif
#ifdef KEY_NUMERIC_8
case KEY_NUMERIC_8: return '8';
#endif
#ifdef KEY_NUMERIC_9
case KEY_NUMERIC_9: return '9';
#endif
#ifdef KEY_NUMERIC_STAR
case KEY_NUMERIC_STAR: return '*';
#endif
#ifdef KEY_NUMERIC_POUND
case KEY_NUMERIC_POUND: return '#';
#endif
#ifdef KEY_KP0
case KEY_KP0: return '0';
#endif
#ifdef KEY_KP1
case KEY_KP1: return '1';
#endif
#ifdef KEY_KP2
case KEY_KP2: return '2';
#endif
#ifdef KEY_KP3
case KEY_KP3: return '3';
#endif
#ifdef KEY_KP4
case KEY_KP4: return '4';
#endif
#ifdef KEY_KP5
case KEY_KP5: return '5';
#endif
#ifdef KEY_KP6
case KEY_KP6: return '6';
#endif
#ifdef KEY_KP7
case KEY_KP7: return '7';
#endif
#ifdef KEY_KP8
case KEY_KP8: return '8';
#endif
#ifdef KEY_KP9
case KEY_KP9: return '9';
#endif
#ifdef KEY_KPDOT
case KEY_KPDOT: return 0x1b;
#endif
#ifdef KEY_KPENTER
case KEY_KPENTER: return '\n';
#endif
default: return -1;
}
}
static int stderr_handler(const char *p, size_t sz, void *arg)
{
(void)arg;
if (write(STDERR_FILENO, p, sz) < 0)
return errno;
return 0;
}
static void reportkey(struct ui_st *st, int ascii)
{
struct re_printf pf;
pf.vph = stderr_handler;
if (!st->h)
return;
st->h(ascii, &pf, st->arg);
}
static void evdev_fd_handler(int flags, void *arg)
{
struct ui_st *st = arg;
struct input_event evv[64]; /* the events (up to 64 at once) */
uint16_t modifier = 0;
size_t n;
int i;
/* This might happen if you unplug a USB device */
if (flags & FD_EXCEPT) {
DEBUG_WARNING("fd handler: FD_EXCEPT - device unplugged?\n");
evdev_close(st);
return;
}
if (FD_READ != flags) {
DEBUG_WARNING("fd_handler: unexpected flags 0x%02x\n", flags);
return;
}
n = read(st->fd, evv, sizeof(evv));
if (n < (int) sizeof(struct input_event)) {
DEBUG_WARNING("event: short read (%m)\n", errno);
return;
}
for (i = 0; i < (int) (n / sizeof(struct input_event)); i++) {
const struct input_event *ev = &evv[i];
DEBUG_INFO("Event: type %u, code %u, value %d\n",
ev->type, ev->code, ev->value);
if (EV_KEY != ev->type)
continue;
if (KEY_LEFTSHIFT == ev->code) {
modifier = KEY_LEFTSHIFT;
continue;
}
if (1 == ev->value) {
const int ascii = code2ascii(modifier, ev->code);
if (-1 == ascii) {
DEBUG_WARNING("unhandled key code %u\n",
ev->code);
}
else
reportkey(st, ascii);
modifier = 0;
}
else if (0 == ev->value) {
reportkey(st, 0x00);
}
}
}
static int evdev_alloc(struct ui_st **stp, struct ui_prm *prm,
ui_input_h *uih, void *arg)
{
const char *dev = str_isset(prm->device) ? prm->device : evdev_device;
struct ui_st *st;
int err = 0;
if (!stp)
return EINVAL;
st = mem_zalloc(sizeof(*st), evdev_destructor);
if (!st)
return ENOMEM;
st->ui = mem_ref(evdev);
st->fd = open(dev, O_RDWR);
if (st->fd < 0) {
err = errno;
goto out;
}
#if 0
/* grab the event device to prevent it from propagating
its events to the regular keyboard driver */
if (-1 == ioctl(st->fd, EVIOCGRAB, (void *)1)) {
DEBUG_WARNING("ioctl EVIOCGRAB on %s (%m)\n", dev, errno);
}
#endif
print_name(st->fd);
print_events(st->fd);
print_keys(st->fd);
print_leds(st->fd);
err = fd_listen(st->fd, FD_READ, evdev_fd_handler, st);
if (err)
goto out;
st->h = uih;
st->arg = arg;
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
static int buzz(const struct ui_st *st, int value)
{
struct input_event ev;
ssize_t n;
ev.type = EV_SND;
ev.code = SND_BELL;
ev.value = value;
n = write(st->fd, &ev, sizeof(ev));
if (n < 0) {
DEBUG_WARNING("output: write fd=%d (%m)\n", st->fd, errno);
}
return errno;
}
static int evdev_output(struct ui_st *st, const char *str)
{
int err = 0;
if (!str)
return EINVAL;
while (*str) {
switch (*str++) {
case '\a':
err |= buzz(st, 1);
break;
default:
err |= buzz(st, 0);
break;
}
}
return err;
}
static int module_init(void)
{
return ui_register(&evdev, "evdev", evdev_alloc, evdev_output);
}
static int module_close(void)
{
evdev = mem_deref(evdev);
return 0;
}
const struct mod_export DECL_EXPORTS(evdev) = {
"evdev",
"ui",
module_init,
module_close
};
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