tools: /dev/rpmsg-omx demo app

*** I'm carrying it here so it doesn't get lost, but this sample
*** probably needs to be refreshed (and moved to samples/...)

This is a user space application that demonstrates usage
of the /dev/rpmsg-omx device.

The app creates a remote OMX instance, and once connection
is established, it starts ping-ponging raw messages with that new OMX
instance (note: currently a generic "OMX" name is used while connecting.
this can be changed to a specific OMX instance name, such as
"h264_decode", when we implement the entire GetHandle function within
the context of the connect ioctl).

We don't really invoke meaningful OMX remote API yet, but this
should be enough infrastructure to start doing real OMX work on both sides
(A9 and Ducati).

Btw I'm using eventfd(2), which I'm not sure bionic supports. Anyway it
can be trivially replaced by pipe(2).

Designed with Brian Swetland <[email protected]>.

Signed-off-by: Ohad Ben-Cohen <[email protected]>

tools/test_rpmsg_omx.c

@@ -0,0 +1,180 @@
+/*
+ * test_rpmsg_omx
+ *
+ * user space testing tool for the rpmsg_omx driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Ohad Ben-Cohen <[email protected]>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the
+ *   distribution.
+ *
+ *   Neither the name of Texas Instruments Incorporated nor the names of
+ *   its contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <sys/eventfd.h>
+
+#include "../include/linux/rpmsg_omx.h"
+
+static pthread_t listener;
+static int omxfd;
+static int die_now_fd;
+
+static void *listener_cb(void *arg)
+{
+	fd_set rfds;
+	struct timeval tv;
+	int ret = 0, maxfd;
+	char buf[512];
+
+	do {
+		/* Wait for OMX messages or self die_now notification */
+		FD_ZERO(&rfds);
+		FD_SET(omxfd, &rfds);
+		FD_SET(die_now_fd, &rfds);
+
+		maxfd = (die_now_fd > omxfd ? die_now_fd : omxfd) + 1;
+		ret = select(maxfd, &rfds, NULL, NULL, NULL);
+		if (ret == -1) {
+			perror("select()");
+			break;
+		}
+
+		if (FD_ISSET(omxfd, &rfds)) {
+			ret = read(omxfd, buf, sizeof(buf));
+			if (ret < 0) {
+				perror("Can't connect to OMX instance");
+				break;
+			}
+
+			printf("RX: %s\n", buf);
+		}
+
+		if (FD_ISSET(die_now_fd, &rfds)) {
+			printf("Need to die!\n");
+			break;
+		}
+
+	} while (1);
+
+	return (void *)ret;
+}
+
+int send_messages(void)
+{
+	const char *msg = "Hello there!";
+	int ret, i;
+
+	/* blather */
+	for (i = 0; i < 10; i++) {
+		ret = write(omxfd, msg, strlen(msg) + 1);
+		if (ret < 0) {
+			perror("Can't connect to OMX instance");
+			return -1;
+		}
+
+		printf("TX: %s\n", msg);
+		sleep(5);
+	}
+
+	return i;
+}
+
+int main(void)
+{
+	int ret;
+	uint64_t die_event = 1;
+	ssize_t s;
+	struct omx_conn_req connreq = { .name = "OMX" };
+
+	/* open the first OMX device */
+	omxfd = open("/dev/rpmsg-omx0", O_RDWR);
+	if (omxfd < 0) {
+		perror("Can't open OMX device");
+		return 1;
+	}
+
+	printf("Connecting to %s\n", connreq.name);
+	/* connect to an h264_decode instance */
+	ret = ioctl(omxfd, OMX_IOCCONNECT, &connreq);
+	if (ret < 0) {
+		perror("Can't connect to OMX instance");
+		return 1;
+	}
+
+	printf("Connected!\n", connreq.name);
+
+	die_now_fd = eventfd(0, 0);
+	if (die_now_fd < 0) {
+		perror("eventfd failed");
+		return 1;
+	}
+
+	ret = pthread_create(&listener, NULL, listener_cb, NULL);
+	if (ret) {
+		printf("can't spawn thread: %s\n", strerror(ret));
+		return 1;
+	}
+
+	ret = send_messages();
+	if (ret < 0)
+		return 1;
+
+	/* terminate connection and destroy OMX instance */
+	ret = close(omxfd);
+	if (ret < 0) {
+		perror("Can't close OMX fd ??");
+		return 1;
+	}
+
+	s = write(die_now_fd, &die_event, sizeof(uint64_t));
+	if (s != sizeof(uint64_t)) {
+		printf("failed to write die_now event\n");
+		return 1;
+	}
+
+	ret = pthread_join(listener, NULL);
+	if (ret) {
+		printf("can't join thread: %s\n", strerror(ret));
+		return 1;
+	}
+
+	printf("Bye!\n");
+
+	return 0;
+}