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-rw-r--r--include/linux/tty_driver.h56
1 files changed, 52 insertions, 4 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 16d2794..78416b9 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -7,6 +7,28 @@
* defined; unless noted otherwise, they are optional, and can be
* filled in with a null pointer.
*
+ * struct tty_struct * (*lookup)(struct tty_driver *self, int idx)
+ *
+ * Return the tty device corresponding to idx, NULL if there is not
+ * one currently in use and an ERR_PTR value on error. Called under
+ * tty_mutex (for now!)
+ *
+ * Optional method. Default behaviour is to use the ttys array
+ *
+ * int (*install)(struct tty_driver *self, struct tty_struct *tty)
+ *
+ * Install a new tty into the tty driver internal tables. Used in
+ * conjunction with lookup and remove methods.
+ *
+ * Optional method. Default behaviour is to use the ttys array
+ *
+ * void (*remove)(struct tty_driver *self, struct tty_struct *tty)
+ *
+ * Remove a closed tty from the tty driver internal tables. Used in
+ * conjunction with lookup and remove methods.
+ *
+ * Optional method. Default behaviour is to use the ttys array
+ *
* int (*open)(struct tty_struct * tty, struct file * filp);
*
* This routine is called when a particular tty device is opened.
@@ -21,6 +43,11 @@
*
* Required method.
*
+ * void (*shutdown)(struct tty_struct * tty);
+ *
+ * This routine is called when a particular tty device is closed for
+ * the last time freeing up the resources.
+ *
* int (*write)(struct tty_struct * tty,
* const unsigned char *buf, int count);
*
@@ -180,6 +207,14 @@
* not force errors here if they are not resizable objects (eg a serial
* line). See tty_do_resize() if you need to wrap the standard method
* in your own logic - the usual case.
+ *
+ * void (*set_termiox)(struct tty_struct *tty, struct termiox *new);
+ *
+ * Called when the device receives a termiox based ioctl. Passes down
+ * the requested data from user space. This method will not be invoked
+ * unless the tty also has a valid tty->termiox pointer.
+ *
+ * Optional: Called under the termios lock
*/
#include <linux/fs.h>
@@ -190,8 +225,13 @@ struct tty_struct;
struct tty_driver;
struct tty_operations {
+ struct tty_struct * (*lookup)(struct tty_driver *driver,
+ struct inode *inode, int idx);
+ int (*install)(struct tty_driver *driver, struct tty_struct *tty);
+ void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
int (*open)(struct tty_struct * tty, struct file * filp);
void (*close)(struct tty_struct * tty, struct file * filp);
+ void (*shutdown)(struct tty_struct *tty);
int (*write)(struct tty_struct * tty,
const unsigned char *buf, int count);
int (*put_char)(struct tty_struct *tty, unsigned char ch);
@@ -220,6 +260,7 @@ struct tty_operations {
unsigned int set, unsigned int clear);
int (*resize)(struct tty_struct *tty, struct tty_struct *real_tty,
struct winsize *ws);
+ int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
#ifdef CONFIG_CONSOLE_POLL
int (*poll_init)(struct tty_driver *driver, int line, char *options);
int (*poll_get_char)(struct tty_driver *driver, int line);
@@ -229,6 +270,7 @@ struct tty_operations {
struct tty_driver {
int magic; /* magic number for this structure */
+ struct kref kref; /* Reference management */
struct cdev cdev;
struct module *owner;
const char *driver_name;
@@ -242,7 +284,6 @@ struct tty_driver {
short subtype; /* subtype of tty driver */
struct ktermios init_termios; /* Initial termios */
int flags; /* tty driver flags */
- int refcount; /* for loadable tty drivers */
struct proc_dir_entry *proc_entry; /* /proc fs entry */
struct tty_driver *other; /* only used for the PTY driver */
@@ -264,12 +305,19 @@ struct tty_driver {
extern struct list_head tty_drivers;
-struct tty_driver *alloc_tty_driver(int lines);
-void put_tty_driver(struct tty_driver *driver);
-void tty_set_operations(struct tty_driver *driver,
+extern struct tty_driver *alloc_tty_driver(int lines);
+extern void put_tty_driver(struct tty_driver *driver);
+extern void tty_set_operations(struct tty_driver *driver,
const struct tty_operations *op);
extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
+extern void tty_driver_kref_put(struct tty_driver *driver);
+extern inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
+{
+ kref_get(&d->kref);
+ return d;
+}
+
/* tty driver magic number */
#define TTY_DRIVER_MAGIC 0x5402
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