diff options
Diffstat (limited to 'include/linux/parport.h')
| -rw-r--r-- | include/linux/parport.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/include/linux/parport.h b/include/linux/parport.h index 294464b65..27d813e9d 100644 --- a/include/linux/parport.h +++ b/include/linux/parport.h @@ -309,6 +309,7 @@ struct parport { rwlock_t cad_lock; int spintime; + atomic_t ref_count; }; #define DEFAULT_SPIN_TIME 500 /* us */ @@ -337,12 +338,9 @@ void parport_announce_port (struct parport *port); /* Unregister a port. */ extern void parport_unregister_port(struct parport *port); -/* parport_in_use returns nonzero if there are devices attached to a - port. */ -#define parport_in_use(x) ((x)->devices != NULL) - /* parport_enumerate returns a pointer to the linked list of all the - ports in this machine. */ + ports in this machine. DON'T USE THIS. Use + parport_register_driver instead. */ struct parport *parport_enumerate(void); /* Register a new high-level driver. */ @@ -351,6 +349,15 @@ extern int parport_register_driver (struct parport_driver *); /* Unregister a high-level driver. */ extern void parport_unregister_driver (struct parport_driver *); +/* If parport_register_driver doesn't fit your needs, perhaps + * parport_find_xxx does. */ +extern struct parport *parport_find_number (int); +extern struct parport *parport_find_base (unsigned long); + +/* Reference counting for ports. */ +extern struct parport *parport_get_port (struct parport *); +extern void parport_put_port (struct parport *); + /* parport_register_device declares that a device is connected to a port, and tells the kernel all it needs to know. - pf is the preemption function (may be NULL for no callback) |