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-rw-r--r--vibrator/vibrator.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/vibrator/vibrator.c b/vibrator/vibrator.c
new file mode 100644
index 0000000..5d8d203
--- /dev/null
+++ b/vibrator/vibrator.c
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2014 Paul Kocialkowski <contact@paulk.fr>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <linux/input.h>
+
+#define LOG_TAG "vibrator"
+#include <cutils/log.h>
+
+/*
+ * Globals
+ */
+
+const char rumble_input[] = "twl4030:vibrator";
+
+int rumble_fd = -1;
+int rumble_id = -1;
+
+/*
+ * Input
+ */
+
+void input_event_set(struct input_event *event, int type, int code, int value)
+{
+ if (event == NULL)
+ return;
+
+ memset(event, 0, sizeof(struct input_event));
+
+ event->type = type,
+ event->code = code;
+ event->value = value;
+
+ gettimeofday(&event->time, NULL);
+}
+
+int input_open(const char *name)
+{
+ DIR *d;
+ struct dirent *di;
+
+ char input_name[80] = { 0 };
+ char path[PATH_MAX];
+ char *c;
+ int fd;
+ int rc;
+
+ if (name == NULL)
+ return -EINVAL;
+
+ d = opendir("/dev/input");
+ if (d == NULL)
+ return -1;
+
+ while ((di = readdir(d))) {
+ if (di == NULL || strcmp(di->d_name, ".") == 0 || strcmp(di->d_name, "..") == 0)
+ continue;
+
+ snprintf(path, PATH_MAX, "/dev/input/%s", di->d_name);
+ fd = open(path, O_RDWR | O_NONBLOCK);
+ if (fd < 0)
+ continue;
+
+ rc = ioctl(fd, EVIOCGNAME(sizeof(input_name) - 1), &input_name);
+ if (rc < 0)
+ continue;
+
+ c = strstr((char *) &input_name, "\n");
+ if (c != NULL)
+ *c = '\0';
+
+ if (strcmp(input_name, name) == 0)
+ return fd;
+ else
+ close(fd);
+ }
+
+ return -1;
+}
+
+/*
+ * Vibrator
+ */
+
+int vibrator_exists(void)
+{
+ int fd;
+
+ fd = input_open(rumble_input);
+ if (fd < 0)
+ return 0;
+
+ close(fd);
+
+ return 1;
+}
+
+int sendit(int duration)
+{
+ struct input_event event;
+ struct ff_effect effect;
+ int rc;
+
+ if (rumble_fd < 0)
+ rumble_fd = input_open(rumble_input);
+
+ if (rumble_fd < 0)
+ goto error;
+
+ if (rumble_id >= 0) {
+ input_event_set(&event, EV_FF, rumble_id, 0);
+
+ rc = write(rumble_fd, &event, sizeof(event));
+ if (rc < (int) sizeof(event))
+ goto error;
+
+ ioctl(rumble_fd, EVIOCRMFF, &rumble_id);
+
+ rumble_id = -1;
+ }
+
+ // Previous code should have removed the effect already
+ if (duration == 0) {
+ rc = 0;
+ goto complete;
+ }
+
+ memset(&effect, 0, sizeof(effect));
+ effect.type = FF_RUMBLE;
+ effect.id = -1;
+ effect.replay.length = duration;
+ effect.replay.delay = 0;
+ effect.u.rumble.strong_magnitude = 0xffff;
+
+ rc = ioctl(rumble_fd, EVIOCSFF, &effect);
+ if (rc < 0)
+ goto error;
+
+ rumble_id = effect.id;
+
+ input_event_set(&event, EV_FF, rumble_id, 1);
+
+ rc = write(rumble_fd, &event, sizeof(event));
+ if (rc < (int) sizeof(event))
+ goto error;
+
+ rc = 0;
+ goto complete;
+
+error:
+ if (rumble_fd >= 0) {
+ if (rumble_id >= 0) {
+ input_event_set(&event, EV_FF, rumble_id, 0);
+ write(rumble_fd, &event, sizeof(event));
+
+ ioctl(rumble_fd, EVIOCRMFF, &rumble_id);
+ rumble_id = -1;
+ }
+
+ close(rumble_fd);
+ rumble_fd = -1;
+ }
+
+ rc = -1;
+
+complete:
+ return rc;
+}