Add driver files

Driver/pcie40_driver/common.c

+#define P40_FMT "P40:%s(): "
+
+#include "common.h"
+
+int pcie40_setup_cdev(struct class *cls, struct cdev *cdev, dev_t dev_num, int minor, int bar, const char *dev_name, int dev_id, struct file_operations *fops)
+{
+  int rc = 0;
+  char dev_name_full[16] = {0};
+
+  snprintf(dev_name_full, sizeof(dev_name_full), "pcie40_%d_%s", dev_id, dev_name);
+
+  printk(P40_DIAG "device_create /dev/%s BAR=%d MAJ=%d, MIN=%d\n", P40_PARM, dev_name_full, bar, MAJOR(dev_num), MINOR(dev_num)+minor);
+
+  if (device_create(cls, NULL, MKDEV(MAJOR(dev_num), MINOR(dev_num)+minor), NULL, dev_name_full) == NULL){
+    rc = -1;
+    printk(P40_DIAG "device_create()\n", P40_PARM);
+    goto err_device_create;
+  }
+  cdev_init(cdev, fops);
+
+  rc = cdev_add(cdev, MKDEV(MAJOR(dev_num), MINOR(dev_num)+minor), 1);
+  if (rc < 0){
+    printk(P40_DIAG "cdev_add()\n", P40_PARM);
+    goto err_cdev_add;
+  }
+  return 0;
+
+err_cdev_add:
+  device_destroy(cls, MKDEV(MAJOR(dev_num), MINOR(dev_num)+minor));
+err_device_create:
+//err_no_bar:
+  return rc;
+}