drivers/tty: make ehv_bytechan.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/tty/Kconfig:config PPC_EPAPR_HV_BYTECHAN
drivers/tty/Kconfig: bool "ePAPR hypervisor byte channel driver"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Jiri Slaby <[e-mail]>
Cc: [e-mail]
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/ehv_bytechan.c

···
  * byte channel used for the console is designated as the default tty.
  */
 
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/err.h>
···
 	return ret;
 }
 
-static int ehv_bc_tty_remove(struct platform_device *pdev)
-{
-	struct ehv_bc_data *bc = dev_get_drvdata(&pdev->dev);
-
-	tty_unregister_device(ehv_bc_driver, bc - bcs);
-
-	tty_port_destroy(&bc->port);
-	irq_dispose_mapping(bc->tx_irq);
-	irq_dispose_mapping(bc->rx_irq);
-
-	return 0;
-}
-
 static const struct of_device_id ehv_bc_tty_of_ids[] = {
 	{ .compatible = "epapr,hv-byte-channel" },
 	{}
···
 	.driver = {
 		.name = "ehv-bc",
 		.of_match_table = ehv_bc_tty_of_ids,
+		.suppress_bind_attrs = true,
 	},
 	.probe		= ehv_bc_tty_probe,
-	.remove		= ehv_bc_tty_remove,
 };
 
 /**
  * ehv_bc_init - ePAPR hypervisor byte channel driver initialization
  *
- * This function is called when this module is loaded.
+ * This function is called when this driver is loaded.
  */
 static int __init ehv_bc_init(void)
 {
···
 
 	return ret;
 }
-
-
-/**
- * ehv_bc_exit - ePAPR hypervisor byte channel driver termination
- *
- * This function is called when this driver is unloaded.
- */
-static void __exit ehv_bc_exit(void)
-{
-	platform_driver_unregister(&ehv_bc_tty_driver);
-	tty_unregister_driver(ehv_bc_driver);
-	put_tty_driver(ehv_bc_driver);
-	kfree(bcs);
-}
-
-module_init(ehv_bc_init);
-module_exit(ehv_bc_exit);
-
-MODULE_AUTHOR("Timur Tabi <[e-mail]>");
-MODULE_DESCRIPTION("ePAPR hypervisor byte channel driver");
-MODULE_LICENSE("GPL v2");
+device_initcall(ehv_bc_init);