external/opal-prd: Add a helper for module loading

Rather than calling system("modprobe ...") in different locations, this
change introduces an insert_module() helper function.

We use this for the existing i2c modprobe, and add one for the ipmi
devintf module too.

We won't need the i2c-opal module, as it should be automatically
loaded by the platform device.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/external/opal-prd/module.c b/external/opal-prd/module.c
new file mode 100644
index 0000000..c483cd4
--- /dev/null
+++ b/external/opal-prd/module.c
@@ -0,0 +1,55 @@
+/* Copyright 2015 IBM Corp.
+ *
+ * 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
+ * imitations under the License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <module.h>
+
+int insert_module(const char *module)
+{
+	int status;
+	pid_t pid;
+
+	pid = fork();
+	if (!pid) {
+		execlp("modprobe", "modprobe", module, NULL);
+		err(EXIT_FAILURE, "Failed to run modprobe");
+	}
+
+	pid = waitpid(pid, &status, 0);
+	if (pid < 0) {
+		warn("waitpid failed for modprobe process");
+		return -1;
+	}
+
+	if (!WIFEXITED(status)) {
+		warnx("modprobe %s: process didn't exit cleanly", module);
+		return -1;
+	}
+
+	if (WEXITSTATUS(status) != 0) {
+		warnx("modprobe %s failed, status %d", module,
+				WEXITSTATUS(status));
+		return -1;
+	}
+
+	return 0;
+}
+