Use proc_ops structure for kernel version >= 5.6.0

Since 5.6.0, proc_create requires a proc_ops* argument
instead of file_operations*.

bbswitch.c

@@ -35,6 +35,10 @@
 #include <linux/suspend.h>
 #include <linux/seq_file.h>
 #include <linux/pm_runtime.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
+#include <linux/proc_fs.h>
+#endif
 
 #define BBSWITCH_VERSION "0.8"
 
@@ -375,13 +379,23 @@ static int bbswitch_pm_handler(struct notifier_block *nbp,
     return 0;
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
+static struct proc_ops bbswitch_fops = {
+    .proc_open   = bbswitch_proc_open,
+    .proc_read   = seq_read,
+    .proc_write  = bbswitch_proc_write,
+    .proc_lseek = seq_lseek,
+    .proc_release= single_release
+};
+#else
 static struct file_operations bbswitch_fops = {
     .open   = bbswitch_proc_open,
     .read   = seq_read,
     .write  = bbswitch_proc_write,
     .llseek = seq_lseek,
     .release= single_release
 };
+#endif
 
 static struct notifier_block nb = {
     .notifier_call = &bbswitch_pm_handler