From 195424a8f59dac12d99d046cc6631baf02dd8223 Mon Sep 17 00:00:00 2001
From: Andi Shyti <andi.shyti@samsung.com>
Date: Fri, 17 Feb 2017 18:13:57 +0900
Subject: gearvr: initial repository

Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
---
 gearvr.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 gearvr.c

diff --git a/gearvr.c b/gearvr.c
new file mode 100644
index 0000000..8cefee6
--- /dev/null
+++ b/gearvr.c
@@ -0,0 +1,117 @@
+#include <fcntl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#define GEARVR_MAX_FAILURE	  5
+#define GEARVR_CDEV	"/dev/hidraw0"
+
+struct gearvr_sample_data {
+	uint8_t n;
+	uint16_t t;
+	uint16_t cmd_id;
+	uint16_t temperature;
+
+	struct stat stat_buf;
+
+	int32_t ax, ay, az, gx, gy, gz;
+};
+
+int gearvr_read(int fd)
+{
+	int ret;
+	int err = 0;
+	struct pollfd fds;
+	uint8_t buf[100];
+
+	fds.fd = fd;
+	fds.events = POLLIN | POLLHUP | POLLERR;
+
+	while (1) {
+		int i;
+		struct gearvr_sample_data odata;
+
+		if (err >= GEARVR_MAX_FAILURE) {
+			fprintf(stderr, "reached maximum attempts\n");
+			return -1;
+		}
+
+		ret = poll(&fds, 1, 100);
+		if (ret < 0)
+			fprintf(stderr, "failed to poll\n");
+
+		if (ret == 0)
+			fprintf(stderr, "timed out\n");
+
+		if (!(fds.revents & POLLIN))
+			fprintf(stderr, "poll exited with error\n");
+
+		if ((ret <= 0) || !(fds.revents & POLLIN))
+			goto fail;
+
+		ret = read(fd, buf, 100);
+		if (ret < 0) {
+			fprintf(stderr, "read() failed\n");
+			goto fail;
+		}
+
+		odata.n = buf[0];
+		odata.t = (buf[3] << 8) | buf[2];
+		odata.cmd_id = (buf[5] << 8) | buf[4];
+		odata.temperature = (buf[7] << 8) | buf[6];
+
+		/*
+		printf("[%u] Read %d bytes: %u data, cmd_id = %u, tempreature = %u\n",
+			odata.t, ret, odata.n, odata.cmd_id, odata.temperature);
+		*/
+
+		for (i = 0; i < odata.n && i < 2; i++) {
+			odata.ax = (buf[0 + 8 + 16 * i] << 13) | (buf[1 + 8 + 16 * i] << 5)
+				| ((buf[2 + 8 + 16 * i] & 0xF8) >> 3);
+			odata.ay = ((buf[2 + 8 + 16 * i] & 0x07) << 18) | (buf[3 + 8 + 16 * i] << 10)
+				| (buf[4 + 8 + 16 * i] << 2) | ((buf[5 + 8 + 16 * i] & 0xC0) >> 6);
+			odata.az = ((buf[5 + 8 + 16 * i] & 0x3F) << 15) | (buf[6 + 8 + 16 * i] << 7)
+				| (buf[7 + 8 + 16 * i] >> 1);
+
+			odata.gx = (buf[0 + 16 + 16 * i] << 13) | (buf[1 + 16 + 16 * i] << 5)
+				| ((buf[2 + 16 + 16 * i] & 0xF8) >> 3);
+			odata.gy = ((buf[2 + 16 + 16 * i] & 0x07) << 18) | (buf[3 + 16 + 16 * i] << 10)
+				| (buf[4 + 16 + 16 * i] << 2) | ((buf[5 + 16 + 16 * i] & 0xC0) >> 6);
+			odata.gz = ((buf[5 + 16 + 16 * i] & 0x3F) << 15) | (buf[6 + 16 + 16 * i] << 7)
+				| (buf[7 + 16 + 16 * i] >> 1);
+
+			//printf("acc [%u]: %8d %8d %8d\n", odata.n, odata.ax, odata.ay, odata.az);
+			printf("gyr: %8d %8d %8d\n", odata.gx, odata.gy, odata.gz);
+		}
+
+		err = 0;
+		continue;
+
+fail:
+		err++;
+		perror("failed to read from device");
+		sleep(1);
+	}
+}
+
+int main (int argc, char *argv[])
+{
+	int ret;
+	int fd;
+
+	fd = open(GEARVR_CDEV, O_RDONLY);
+	if (fd < 0) {
+		perror("cannot open file");
+		return -1;
+	}
+
+	ret = gearvr_read(fd);
+
+	close(fd);
+
+	return ret;
+}
-- 
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