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tty: add kernel-doc for tty_driver

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tty_driver used to have only short comments along its members. Convert
them into proper kernel-doc comments in front of the structure. And add
some more explanation to them where needed.

The whole structure handling is documented at the end too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211126081611.11001-4-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-11-26 09:15:51 +01:00 committed by Greg Kroah-Hartman
parent 61c83addb7
commit a656383021
1 changed files with 50 additions and 12 deletions
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62
include/linux/tty_driver.h
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@ -291,23 +291,61 @@ struct tty_operations {
int (*proc_show)(struct seq_file *, void *);
} __randomize_layout;
/**
* struct tty_driver -- driver for TTY devices
*
* @magic: set to %TTY_DRIVER_MAGIC in __tty_alloc_driver()
* @kref: reference counting. Reaching zero frees all the internals and the
* driver.
* @cdevs: allocated/registered character /dev devices
* @owner: modules owning this driver. Used drivers cannot be rmmod'ed.
* Automatically set by tty_alloc_driver().
* @driver_name: name of the driver used in /proc/tty
* @name: used for constructing /dev node name
* @name_base: used as a number base for constructing /dev node name
* @major: major /dev device number (zero for autoassignment)
* @minor_start: the first minor /dev device number
* @num: number of devices allocated
* @type: type of tty driver (%TTY_DRIVER_TYPE_)
* @subtype: subtype of tty driver (%SYSTEM_TYPE_, %PTY_TYPE_, %SERIAL_TYPE_)
* @init_termios: termios to set to each tty initially (e.g. %tty_std_termios)
* @flags: tty driver flags (%TTY_DRIVER_)
* @proc_entry: proc fs entry, used internally
* @other: driver of the linked tty; only used for the PTY driver
* @ttys: array of active &struct tty_struct, set by tty_standard_install()
* @ports: array of &struct tty_port; can be set during initialization by
* tty_port_link_device() and similar
* @termios: storage for termios at each TTY close for the next open
* @driver_state: pointer to driver's arbitrary data
* @ops: driver hooks for TTYs. Set them using tty_set_operations(). Use &struct
* tty_port helpers in them as much as possible.
* @tty_drivers: used internally to link tty_drivers together
*
* The usual handling of &struct tty_driver is to allocate it by
* tty_alloc_driver(), set up all the necessary members, and register it by
* tty_register_driver(). At last, the driver is torn down by calling
* tty_unregister_driver() followed by tty_driver_kref_put().
*
* The fields required to be set before calling tty_register_driver() include
* @driver_name, @name, @type, @subtype, @init_termios, and @ops.
*/
struct tty_driver {
int magic; /* magic number for this structure */
struct kref kref; /* Reference management */
int magic;
struct kref kref;
struct cdev **cdevs;
struct module *owner;
const char *driver_name;
const char *name;
int name_base; /* offset of printed name */
int major; /* major device number */
int minor_start; /* start of minor device number */
unsigned int num; /* number of devices allocated */
short type; /* type of tty driver */
short subtype; /* subtype of tty driver */
struct ktermios init_termios; /* Initial termios */
unsigned long flags; /* tty driver flags */
struct proc_dir_entry *proc_entry; /* /proc fs entry */
struct tty_driver *other; /* only used for the PTY driver */
int name_base;
int major;
int minor_start;
unsigned int num;
short type;
short subtype;
struct ktermios init_termios;
unsigned long flags;
struct proc_dir_entry *proc_entry;
struct tty_driver *other;
/*
* Pointer to the tty data structures