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-rw-r--r--include/linux/tty_driver.h47
1 files changed, 34 insertions, 13 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 6e6dbb7..dd976cf 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -45,14 +45,9 @@
*
* void (*shutdown)(struct tty_struct * tty);
*
- * This routine is called synchronously when a particular tty device
- * is closed for the last time freeing up the resources.
- * Note that tty_shutdown() is not called if ops->shutdown is defined.
- * This means one is responsible to take care of calling ops->remove (e.g.
- * via tty_driver_remove_tty) and releasing tty->termios.
- * Note that this hook may be called from *all* the contexts where one
- * uses tty refcounting (e.g. tty_port_tty_get).
- *
+ * This routine is called under the tty lock when a particular tty device
+ * is closed for the last time. It executes before the tty resources
+ * are freed so may execute while another function holds a tty kref.
*
* void (*cleanup)(struct tty_struct * tty);
*
@@ -294,18 +289,18 @@ struct tty_operations {
struct tty_driver {
int magic; /* magic number for this structure */
struct kref kref; /* Reference management */
- struct cdev cdev;
+ 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 */
- int num; /* number of devices allocated */
+ 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 */
- int flags; /* tty driver flags */
+ 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 */
@@ -313,6 +308,7 @@ struct tty_driver {
* Pointer to the tty data structures
*/
struct tty_struct **ttys;
+ struct tty_port **ports;
struct ktermios **termios;
void *driver_state;
@@ -326,7 +322,8 @@ struct tty_driver {
extern struct list_head tty_drivers;
-extern struct tty_driver *__alloc_tty_driver(int lines, struct module *owner);
+extern struct tty_driver *__tty_alloc_driver(unsigned int lines,
+ struct module *owner, unsigned long flags);
extern void put_tty_driver(struct tty_driver *driver);
extern void tty_set_operations(struct tty_driver *driver,
const struct tty_operations *op);
@@ -334,7 +331,21 @@ extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
extern void tty_driver_kref_put(struct tty_driver *driver);
-#define alloc_tty_driver(lines) __alloc_tty_driver(lines, THIS_MODULE)
+/* Use TTY_DRIVER_* flags below */
+#define tty_alloc_driver(lines, flags) \
+ __tty_alloc_driver(lines, THIS_MODULE, flags)
+
+/*
+ * DEPRECATED Do not use this in new code, use tty_alloc_driver instead.
+ * (And change the return value checks.)
+ */
+static inline struct tty_driver *alloc_tty_driver(unsigned int lines)
+{
+ struct tty_driver *ret = tty_alloc_driver(lines, 0);
+ if (IS_ERR(ret))
+ return NULL;
+ return ret;
+}
static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
{
@@ -380,6 +391,14 @@ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
* the requested timeout to the caller instead of using a simple
* on/off interface.
*
+ * TTY_DRIVER_DYNAMIC_ALLOC -- do not allocate structures which are
+ * needed per line for this driver as it would waste memory.
+ * The driver will take care.
+ *
+ * TTY_DRIVER_UNNUMBERED_NODE -- do not create numbered /dev nodes. In
+ * other words create /dev/ttyprintk and not /dev/ttyprintk0.
+ * Applicable only when a driver for a single tty device is
+ * being allocated.
*/
#define TTY_DRIVER_INSTALLED 0x0001
#define TTY_DRIVER_RESET_TERMIOS 0x0002
@@ -387,6 +406,8 @@ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
#define TTY_DRIVER_DYNAMIC_DEV 0x0008
#define TTY_DRIVER_DEVPTS_MEM 0x0010
#define TTY_DRIVER_HARDWARE_BREAK 0x0020
+#define TTY_DRIVER_DYNAMIC_ALLOC 0x0040
+#define TTY_DRIVER_UNNUMBERED_NODE 0x0080
/* tty driver types */
#define TTY_DRIVER_TYPE_SYSTEM 0x0001
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