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Commit ce808b74 authored by Jag Raman's avatar Jag Raman Committed by David S. Miller
Browse files

sparc64: vcc: TTY driver initialization and cleanup 



Allocate and register TTY driver during module init. Cleanup
TTY driver during module exit.

Signed-off-by: default avatarJagannathan Raman <jag.raman@oracle.com>
Reviewed-by: default avatarLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f283ebd5

drivers/tty/vcc.c

+82 −1
Original line number Diff line number Diff line
@@ -4,15 +4,26 @@ 
 */



#include <linux/module.h>

#include <linux/tty.h>



#define DRV_MODULE_NAME		"vcc"

#define DRV_MODULE_VERSION	"1.1"

#define DRV_MODULE_RELDATE	"July 1, 2017"



static char version[] =

	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";



MODULE_DESCRIPTION("Sun LDOM virtual console concentrator driver");

MODULE_LICENSE("GPL");

MODULE_VERSION(DRV_MODULE_VERSION);



#define VCC_MAX_PORTS		1024

#define VCC_MINOR_START		0	/* must be zero */



static const char vcc_driver_name[] = "vcc";

static const char vcc_device_node[] = "vcc";

static struct tty_driver *vcc_tty_driver;



int vcc_dbg;

int vcc_dbg_ldc;

int vcc_dbg_vio;
@@ -46,13 +57,83 @@ module_param(vcc_dbg_vio, uint, 0664); 
		}						\

	} while (0)						\



static int __init vcc_init(void)

/* Note: Be careful when adding flags to this line discipline.  Don't

 * add anything that will cause echoing or we'll go into recursive

 * loop echoing chars back and forth with the console drivers.

 */

static struct ktermios vcc_tty_termios = {

	.c_iflag = IGNBRK | IGNPAR,

	.c_oflag = OPOST,

	.c_cflag = B38400 | CS8 | CREAD | HUPCL,

	.c_cc = INIT_C_CC,

	.c_ispeed = 38400,

	.c_ospeed = 38400

};



static const struct tty_operations vcc_ops;



#define VCC_TTY_FLAGS   (TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_REAL_RAW)



static int vcc_tty_init(void)

{

	int rv;



	pr_info("VCC: %s\n", version);



	vcc_tty_driver = tty_alloc_driver(VCC_MAX_PORTS, VCC_TTY_FLAGS);

	if (!vcc_tty_driver) {

		pr_err("VCC: TTY driver alloc failed\n");

		return -ENOMEM;

	}



	vcc_tty_driver->driver_name = vcc_driver_name;

	vcc_tty_driver->name = vcc_device_node;



	vcc_tty_driver->minor_start = VCC_MINOR_START;

	vcc_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;

	vcc_tty_driver->init_termios = vcc_tty_termios;



	tty_set_operations(vcc_tty_driver, &vcc_ops);



	rv = tty_register_driver(vcc_tty_driver);

	if (rv) {

		pr_err("VCC: TTY driver registration failed\n");

		put_tty_driver(vcc_tty_driver);

		vcc_tty_driver = NULL;

		return rv;

	}



	vccdbg("VCC: TTY driver registered\n");



	return 0;

}



static void vcc_tty_exit(void)

{

	tty_unregister_driver(vcc_tty_driver);

	put_tty_driver(vcc_tty_driver);

	vccdbg("VCC: TTY driver unregistered\n");



	vcc_tty_driver = NULL;

}



static int __init vcc_init(void)

{

	int rv;



	rv = vcc_tty_init();

	if (rv) {

		pr_err("VCC: TTY init failed\n");

		return rv;

	}



	return rv;

}



static void __exit vcc_exit(void)

{

	vcc_tty_exit();

	vccdbg("VCC: TTY driver unregistered\n");

}



module_init(vcc_init);