drivers/tty/vt/vt.c

Source file repositories/reference/linux-study-clean/drivers/tty/vt/vt.c

File Facts

System
Linux kernel
Corpus path
drivers/tty/vt/vt.c
Extension
.c
Size
124231 bytes
Lines
5112
Domain
Driver Families
Bucket
drivers/tty
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

int __init vty_init(const struct file_operations *console_fops)
{
	cdev_init(&vc0_cdev, console_fops);
	if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
	    register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
		panic("Couldn't register /dev/tty0 driver\n");
	tty0dev = device_create_with_groups(&tty_class, NULL,
					    MKDEV(TTY_MAJOR, 0), NULL,
					    vt_dev_groups, "tty0");
	if (IS_ERR(tty0dev))
		tty0dev = NULL;

	vcs_init();

	console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
			TTY_DRIVER_RESET_TERMIOS);
	if (IS_ERR(console_driver))
		panic("Couldn't allocate console driver\n");

	console_driver->name = "tty";
	console_driver->name_base = 1;
	console_driver->major = TTY_MAJOR;
	console_driver->minor_start = 1;
	console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
	console_driver->init_termios = tty_std_termios;
	if (default_utf8)
		console_driver->init_termios.c_iflag |= IUTF8;
	tty_set_operations(console_driver, &con_ops);
	if (tty_register_driver(console_driver))
		panic("Couldn't register console driver\n");
	kbd_init();
	console_map_init();
	return 0;
}

static const struct class vtconsole_class = {
	.name = "vtconsole",
};

static int do_bind_con_driver(const struct consw *csw, int first, int last,
			   int deflt)
{
	struct module *owner = csw->owner;
	const char *desc = NULL;
	struct con_driver *con_driver;
	int i, j = -1, k = -1, retval = -ENODEV;

	if (!try_module_get(owner))
		return -ENODEV;

	WARN_CONSOLE_UNLOCKED();

	/* check if driver is registered */
	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
		con_driver = &registered_con_driver[i];

		if (con_driver->con == csw) {
			desc = con_driver->desc;
			retval = 0;
			break;
		}
	}

	if (retval)
		goto err;

	if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
		csw->con_startup();
		con_driver->flag |= CON_DRIVER_FLAG_INIT;
	}

	if (deflt) {
		if (conswitchp)
			module_put(conswitchp->owner);

		__module_get(owner);
		conswitchp = csw;
	}

	first = max(first, con_driver->first);
	last = min(last, con_driver->last);

	for (i = first; i <= last; i++) {
		int old_was_color;
		struct vc_data *vc = vc_cons[i].d;

		if (con_driver_map[i])
			module_put(con_driver_map[i]->owner);
		__module_get(owner);
		con_driver_map[i] = csw;

Annotation

Implementation Notes