266 lines
8.4 KiB
C
266 lines
8.4 KiB
C
#include "input_dev.h"
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#include "message.h"
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#include "queue.h"
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#include <libevdev-1.0/libevdev/libevdev.h>
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#include <linux/input-event-codes.h>
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#include <linux/input.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <termios.h>
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#include <dirent.h>
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#include <stdio.h>
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static const char *input_path = "/dev/input/";
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static struct libevdev* ev_matches(const char* sysfs_entry, const uinput_filters_t* const filters) {
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struct libevdev *dev = NULL;
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int fd = open(sysfs_entry, O_RDWR);
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if (fd < 0) {
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//fprintf(stderr, "Cannot open %s, device skipped.\n", sysfs_entry);
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return NULL;
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}
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if (libevdev_new_from_fd(fd, &dev) != 0) {
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//fprintf(stderr, "Cannot initialize libevdev from this device (%s): skipping.\n", sysfs_entry);
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close(fd);
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return NULL;
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}
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const char* name = libevdev_get_name(dev);
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if ((name != NULL) && (strcmp(name, filters->name) != 0)) {
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//fprintf(stderr, "The device name (%s) for device %s does not matches the expected one %s.\n", name, sysfs_entry, filters->name);
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libevdev_free(dev);
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close(fd);
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return NULL;
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}
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const int grab_res = libevdev_grab(dev, LIBEVDEV_GRAB);
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if (grab_res != 0) {
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fprintf(stderr, "Unable to grab the device (%s): %d.\n", sysfs_entry, grab_res);
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//libevdev_free(dev);
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//close(fd);
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return dev;
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}
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return dev;
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}
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static pthread_mutex_t input_acquire_mutex = PTHREAD_MUTEX_INITIALIZER;
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static char* open_sysfs[] = {
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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};
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#define MAX_MESSAGES_IN_FLIGHT 32
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#define DEFAULT_EVENTS_IN_REPORT 4
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struct input_ctx {
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struct libevdev* dev;
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queue_t* queue;
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message_t messages[MAX_MESSAGES_IN_FLIGHT];
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};
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void* input_read_thread_func(void* ptr) {
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struct input_ctx* ctx = (struct input_ctx*)ptr;
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struct libevdev* dev = ctx->dev;
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int has_syn = libevdev_has_event_type(ctx->dev, EV_SYN);
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int rc = 1;
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message_t* msg = NULL;
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do {
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if (msg == NULL) {
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for (int h = 0; h < MAX_MESSAGES_IN_FLIGHT; ++h) {
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if ((ctx->messages[h].flags & MESSAGE_FLAGS_HANDLE_DONE) != 0) {
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msg = &ctx->messages[h];
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msg->ev_count = 0;
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break;
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}
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}
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}
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if (msg == NULL) {
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fprintf(stderr, "Events are stalled.\n");
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continue;
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}
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struct input_event read_ev;
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rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_BLOCKING, &read_ev);
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if (rc == 0) {
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if ((!has_syn) || ((read_ev.type != EV_SYN) && (read_ev.code != SYN_REPORT))) {
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if ((msg->ev_count+1) == msg->ev_size) {
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// TODO: perform a memove
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printf("memove\n");
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} else {
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printf(
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"Event: %s %s %d\n",
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libevdev_event_type_get_name(read_ev.type),
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libevdev_event_code_get_name(read_ev.type, read_ev.code),
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read_ev.value
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);
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// just copy the input event
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msg->ev[msg->ev_count] = read_ev;
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++msg->ev_count;
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}
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}
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if ((!has_syn) || ((read_ev.type == EV_SYN) && (read_ev.code == SYN_REPORT))) {
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printf("Sync ---------------------------------------\n");
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// clear out flags
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msg->flags = 0x00000000U;
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if (queue_push(ctx->queue, (void*)msg) != 0) {
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fprintf(stderr, "Error pushing event.\n");
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// flag the memory to be safe to reuse
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msg->flags |= MESSAGE_FLAGS_HANDLE_DONE;
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}
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// either way.... fill a new buffer on the next cycle
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msg = NULL;
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}
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}
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} while (rc == 1 || rc == 0 || rc == -EAGAIN);
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return NULL;
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}
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void *input_dev_thread_func(void *ptr) {
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input_dev_t *in_dev = (input_dev_t*)ptr;
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struct input_ctx ctx = {
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.dev = NULL,
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.queue = in_dev->queue,
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};
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for (int h = 0; h < MAX_MESSAGES_IN_FLIGHT; ++h) {
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ctx.messages[h].flags = MESSAGE_FLAGS_HANDLE_DONE;
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ctx.messages[h].ev_size = DEFAULT_EVENTS_IN_REPORT;
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ctx.messages[h].ev = malloc(sizeof(struct input_event) * ctx.messages[h].ev_size);
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}
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int open_sysfs_idx = -1;
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for (;;) {
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const uint32_t flags = in_dev->crtl_flags;
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if (flags & INPUT_DEV_CTRL_FLAG_EXIT) {
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in_dev->crtl_flags &= ~INPUT_DEV_CTRL_FLAG_EXIT;
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break;
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}
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// clean up from previous iteration
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if (ctx.dev != NULL) {
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libevdev_free(ctx.dev);
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ctx.dev = NULL;
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}
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const int input_acquire_lock_result = pthread_mutex_lock(&input_acquire_mutex);
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if (input_acquire_lock_result != 0) {
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fprintf(stderr, "Cannot lock input mutex: %d, will retry later...\n", input_acquire_lock_result);
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usleep(250000);
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continue;
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}
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// clean up leftover from previous opening
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if (open_sysfs_idx >= 0) {
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free(open_sysfs[open_sysfs_idx]);
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open_sysfs[open_sysfs_idx] = NULL;
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}
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char path[512] = "\0";
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DIR *d;
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struct dirent *dir;
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d = opendir(input_path);
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if (d) {
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while ((dir = readdir(d)) != NULL) {
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if (dir->d_name[0] == '.') {
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continue;
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} else if (dir->d_name[0] == 'b') { // by-id
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continue;
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} else if (dir->d_name[0] == 'j') { // js-0
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continue;
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}
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sprintf(path, "%s%s", input_path, dir->d_name);
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// check if that has been already opened
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// open_sysfs
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int skip = 0;
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for (int o = 0; o < (sizeof(open_sysfs) / sizeof(const char*)); ++o) {
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if ((open_sysfs[o] != NULL) && (strcmp(open_sysfs[o], path) == 0)) {
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skip = 1;
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break;
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}
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}
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if (skip) {
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continue;
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}
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// try to open the device
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ctx.dev = ev_matches(path, in_dev->ev_filters);
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if (ctx.dev != NULL) {
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open_sysfs_idx = 0;
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while (open_sysfs[open_sysfs_idx] != NULL) {
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++open_sysfs_idx;
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}
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open_sysfs[open_sysfs_idx] = malloc(sizeof(path));
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memcpy(open_sysfs[open_sysfs_idx], path, 512);
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if (libevdev_has_event_type(ctx.dev, EV_FF)) {
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printf("Opened device %s\n name: %s\n rumble: %s\n",
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path,
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libevdev_get_name(ctx.dev),
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libevdev_has_event_code(ctx.dev, EV_FF, FF_RUMBLE) ? "true" : "false"
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);
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} else {
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printf("Opened device %s\n name: %s\n rumble: no EV_FF\n",
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path,
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libevdev_get_name(ctx.dev)
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);
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}
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break;
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}
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}
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closedir(d);
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}
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pthread_mutex_unlock(&input_acquire_mutex);
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if (ctx.dev == NULL) {
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usleep(250000);
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continue;
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}
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pthread_t incoming_events_thread;
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const int incoming_events_thread_creation = pthread_create(&incoming_events_thread, NULL, input_read_thread_func, (void*)&ctx);
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if (incoming_events_thread_creation != 0) {
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fprintf(stderr, "Error creating the input thread for device %s: %d\n", libevdev_get_name(ctx.dev), incoming_events_thread_creation);
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}
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if (incoming_events_thread_creation == 0) {
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pthread_join(incoming_events_thread, NULL);
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}
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}
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return NULL;
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}
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