pps: clients: parport: Switch to use module_parport_driver()

Switch to use module_parport_driver() to reduce boilerplate code.
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210607153729.58623-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/pps/clients/pps_parport.c

@@ -22,8 +22,6 @@
 #include <linux/parport.h>
 #include <linux/pps_kernel.h>
 
-#define DRVDESC "parallel port PPS client"
-
 /* module parameters */
 
 #define CLEAR_WAIT_MAX		100
@@ -138,6 +136,12 @@ static void parport_attach(struct parport *port)
 		.dev		= NULL
 	};
 
+	if (clear_wait > CLEAR_WAIT_MAX) {
+		pr_err("clear_wait value should be not greater then %d\n",
+		       CLEAR_WAIT_MAX);
+		return;
+	}
+
 	device = kzalloc(sizeof(struct pps_client_pp), GFP_KERNEL);
 	if (!device) {
 		pr_err("memory allocation failed, not attaching\n");
@@ -214,38 +218,8 @@ static struct parport_driver pps_parport_driver = {
 	.detach = parport_detach,
 	.devmodel = true,
 };
-
-/* module staff */
-
-static int __init pps_parport_init(void)
-{
-	int ret;
-
-	pr_info(DRVDESC "\n");
-
-	if (clear_wait > CLEAR_WAIT_MAX) {
-		pr_err("clear_wait value should be not greater"
-				" then %d\n", CLEAR_WAIT_MAX);
-		return -EINVAL;
-	}
-
-	ret = parport_register_driver(&pps_parport_driver);
-	if (ret) {
-		pr_err("unable to register with parport\n");
-		return ret;
-	}
-
-	return  0;
-}
-
-static void __exit pps_parport_exit(void)
-{
-	parport_unregister_driver(&pps_parport_driver);
-}
-
-module_init(pps_parport_init);
-module_exit(pps_parport_exit);
+module_parport_driver(pps_parport_driver);
 
 MODULE_AUTHOR("Alexander Gordeev <lasaine@lvk.cs.msu.su>");
-MODULE_DESCRIPTION(DRVDESC);
+MODULE_DESCRIPTION("parallel port PPS client");
 MODULE_LICENSE("GPL");