Reintroduce devicemodel example

It was getting snaggled by gitignore

.gitignore

@@ -2,5 +2,4 @@
 *.ko
 *cmd
 *.swp
-*mod*
-*.symvers
+*.symvers

4.14.8/examples/Makefile

@@ -22,6 +22,7 @@ obj-m += cryptosha256.o
 obj-m += cryptoapi.o
 obj-m += completions.o
 obj-m += example_tasklet.o
+obj-m += devicemodel.o
 obj-m += example_spinlock.o
 obj-m += example_rwlock.o
 obj-m += example_atomic.o

4.14.8/examples/devicemodel.c

@@ -0,0 +1,96 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+struct devicemodel_data {
+    char *greeting;
+    int   number;
+};
+
+static int devicemodel_probe(struct platform_device *dev)
+{
+    struct devicemodel_data *pd = (struct devicemodel_data *)(dev->dev.platform_data);
+
+    pr_info("devicemodel probe\n");
+    pr_info("devicemodel greeting: %s; %d\n", pd->greeting, pd->number);
+
+    /* Your device initialisation code */
+
+    return 0;
+}
+
+static int devicemodel_remove(struct platform_device *dev)
+{
+    pr_info("devicemodel example removed\n");
+
+    /* Your device removal code */
+
+    return 0;
+}
+
+static int devicemodel_suspend(struct device *dev)
+{
+    pr_info("devicemodel example suspend\n");
+
+    /* Your device suspend code */
+
+    return 0;
+}
+
+static int devicemodel_resume(struct device *dev)
+{
+    pr_info("devicemodel example resume\n");
+
+    /* Your device resume code */
+
+    return 0;
+}
+
+static const struct dev_pm_ops devicemodel_pm_ops =
+{
+    .suspend = devicemodel_suspend,
+    .resume = devicemodel_resume,
+    .poweroff = devicemodel_suspend,
+    .freeze = devicemodel_suspend,
+    .thaw = devicemodel_resume,
+    .restore = devicemodel_resume
+};
+
+static struct platform_driver devicemodel_driver = {
+    .driver     = {
+        .name   = "devicemodel_example",
+        .owner  = THIS_MODULE,
+        .pm     = &devicemodel_pm_ops,
+    },
+    .probe      = devicemodel_probe,
+    .remove     = devicemodel_remove,
+};
+
+static int devicemodel_init(void)
+{
+    int ret;
+
+    pr_info("devicemodel init\n");
+
+    ret = platform_driver_register(&devicemodel_driver);
+
+    if (ret) {
+        pr_err("Unable to register driver\n");
+        return ret;
+    }
+
+    return 0;
+}
+
+static void devicemodel_exit(void)
+{
+    pr_info("devicemodel exit\n");
+    platform_driver_unregister(&devicemodel_driver);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bob Mottram");
+MODULE_DESCRIPTION("Linux Device Model example");
+
+module_init(devicemodel_init);
+module_exit(devicemodel_exit);