Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / samples / rpmsg / rpmsg_client_sample.c

diff --git a/kernel/samples/rpmsg/rpmsg_client_sample.c b/kernel/samples/rpmsg/rpmsg_client_sample.c
new file mode 100644 (file)
index 0000000..59b1344
--- /dev/null
+++ b/kernel/samples/rpmsg/rpmsg_client_sample.c
@@ -0,0 +1,100 @@
+/*
+ * Remote processor messaging - sample client driver
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/rpmsg.h>
+
+#define MSG            "hello world!"
+#define MSG_LIMIT      100
+
+static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len,
+                                               void *priv, u32 src)
+{
+       int ret;
+       static int rx_count;
+
+       dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src);
+
+       print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
+                      data, len,  true);
+
+       /* samples should not live forever */
+       if (rx_count >= MSG_LIMIT) {
+               dev_info(&rpdev->dev, "goodbye!\n");
+               return;
+       }
+
+       /* send a new message now */
+       ret = rpmsg_send(rpdev, MSG, strlen(MSG));
+       if (ret)
+               dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+}
+
+static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
+{
+       int ret;
+
+       dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
+                                       rpdev->src, rpdev->dst);
+
+       /* send a message to our remote processor */
+       ret = rpmsg_send(rpdev, MSG, strlen(MSG));
+       if (ret) {
+               dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static void rpmsg_sample_remove(struct rpmsg_channel *rpdev)
+{
+       dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
+}
+
+static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
+       { .name = "rpmsg-client-sample" },
+       { },
+};
+MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
+
+static struct rpmsg_driver rpmsg_sample_client = {
+       .drv.name       = KBUILD_MODNAME,
+       .drv.owner      = THIS_MODULE,
+       .id_table       = rpmsg_driver_sample_id_table,
+       .probe          = rpmsg_sample_probe,
+       .callback       = rpmsg_sample_cb,
+       .remove         = rpmsg_sample_remove,
+};
+
+static int __init rpmsg_client_sample_init(void)
+{
+       return register_rpmsg_driver(&rpmsg_sample_client);
+}
+module_init(rpmsg_client_sample_init);
+
+static void __exit rpmsg_client_sample_fini(void)
+{
+       unregister_rpmsg_driver(&rpmsg_sample_client);
+}
+module_exit(rpmsg_client_sample_fini);
+
+MODULE_DESCRIPTION("Remote processor messaging sample client driver");
+MODULE_LICENSE("GPL v2");