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sparc64: vcc: TTY driver initialization and cleanup

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

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-08-15 17:02:59 -04:00 committed by David S. Miller
parent f283ebd564
commit ce808b7463
1 changed files with 82 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

83
drivers/tty/vcc.c
View file

@ -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) \
/* 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)
{
return 0;
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);