1 #ifndef _LINUX_TTY_H
2 #define _LINUX_TTY_H
3
4 #include <linux/fs.h>
5 #include <linux/major.h>
6 #include <linux/termios.h>
7 #include <linux/workqueue.h>
8 #include <linux/tty_driver.h>
9 #include <linux/tty_ldisc.h>
10 #include <linux/mutex.h>
11 #include <linux/tty_flags.h>
12 #include <uapi/linux/tty.h>
13
14
15
16 /*
17 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
18 * hardcoded at present.)
19 */
20 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
21 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
22 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
23
24 /*
25 * This character is the same as _POSIX_VDISABLE: it cannot be used as
26 * a c_cc[] character, but indicates that a particular special character
27 * isn't in use (eg VINTR has no character etc)
28 */
29 #define __DISABLED_CHAR '\0'
30
31 struct tty_buffer {
32 struct tty_buffer *next;
33 char *char_buf_ptr;
34 unsigned char *flag_buf_ptr;
35 int used;
36 int size;
37 int commit;
38 int read;
39 /* Data points here */
40 unsigned long data[0];
41 };
42
43 /*
44 * We default to dicing tty buffer allocations to this many characters
45 * in order to avoid multiple page allocations. We know the size of
46 * tty_buffer itself but it must also be taken into account that the
47 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
48 * logic this must match
49 */
50
51 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
52
53
54 struct tty_bufhead {
55 struct work_struct work;
56 spinlock_t lock;
57 struct tty_buffer *head; /* Queue head */
58 struct tty_buffer *tail; /* Active buffer */
59 struct tty_buffer *free; /* Free queue head */
60 int memory_used; /* Buffer space used excluding
61 free queue */
62 };
63 /*
64 * When a break, frame error, or parity error happens, these codes are
65 * stuffed into the flags buffer.
66 */
67 #define TTY_NORMAL 0
68 #define TTY_BREAK 1
69 #define TTY_FRAME 2
70 #define TTY_PARITY 3
71 #define TTY_OVERRUN 4
72
73 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
74 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
75 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
76 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
77 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
78 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
79 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
80 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
81 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
82 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
83 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
84 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
85 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
86 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
87 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
88 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
89 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
90
91 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
92 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
93 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
94 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
95
96 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
97 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
98 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
99 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
100 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
101 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
102 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
103 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
104 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
105 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
106 #define I_IXON(tty) _I_FLAG((tty), IXON)
107 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
108 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
109 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
110 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
111
112 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
113 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
114 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
115 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
116 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
117 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
118 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
119 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
120 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
121 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
122 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
123 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
124 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
125 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
126
127 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
128 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
129 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
130 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
131 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
132 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
133 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
134 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
135 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
136 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
137
138 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
139 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
140 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
141 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
142 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
143 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
144 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
145 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
146 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
147 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
148 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
149 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
150 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
151 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
152 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
153 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
154
155 struct device;
156 struct signal_struct;
157
158 /*
159 * Port level information. Each device keeps its own port level information
160 * so provide a common structure for those ports wanting to use common support
161 * routines.
162 *
163 * The tty port has a different lifetime to the tty so must be kept apart.
164 * In addition be careful as tty -> port mappings are valid for the life
165 * of the tty object but in many cases port -> tty mappings are valid only
166 * until a hangup so don't use the wrong path.
167 */
168
169 struct tty_port;
170
171 struct tty_port_operations {
172 /* Return 1 if the carrier is raised */
173 int (*carrier_raised)(struct tty_port *port);
174 /* Control the DTR line */
175 void (*dtr_rts)(struct tty_port *port, int raise);
176 /* Called when the last close completes or a hangup finishes
177 IFF the port was initialized. Do not use to free resources. Called
178 under the port mutex to serialize against activate/shutdowns */
179 void (*shutdown)(struct tty_port *port);
180 void (*drop)(struct tty_port *port);
181 /* Called under the port mutex from tty_port_open, serialized using
182 the port mutex */
183 /* FIXME: long term getting the tty argument *out* of this would be
184 good for consoles */
185 int (*activate)(struct tty_port *port, struct tty_struct *tty);
186 /* Called on the final put of a port */
187 void (*destruct)(struct tty_port *port);
188 };
189
190 struct tty_port {
191 struct tty_bufhead buf; /* Locked internally */
192 struct tty_struct *tty; /* Back pointer */
193 struct tty_struct *itty; /* internal back ptr */
194 const struct tty_port_operations *ops; /* Port operations */
195 spinlock_t lock; /* Lock protecting tty field */
196 int blocked_open; /* Waiting to open */
197 int count; /* Usage count */
198 wait_queue_head_t open_wait; /* Open waiters */
199 wait_queue_head_t close_wait; /* Close waiters */
200 wait_queue_head_t delta_msr_wait; /* Modem status change */
201 unsigned long flags; /* TTY flags ASY_*/
202 unsigned long iflags; /* TTYP_ internal flags */
203 #define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
204 #define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
205 unsigned char console:1, /* port is a console */
206 low_latency:1; /* direct buffer flush */
207 struct mutex mutex; /* Locking */
208 struct mutex buf_mutex; /* Buffer alloc lock */
209 unsigned char *xmit_buf; /* Optional buffer */
210 unsigned int close_delay; /* Close port delay */
211 unsigned int closing_wait; /* Delay for output */
212 int drain_delay; /* Set to zero if no pure time
213 based drain is needed else
214 set to size of fifo */
215 struct kref kref; /* Ref counter */
216 };
217
218 /*
219 * Where all of the state associated with a tty is kept while the tty
220 * is open. Since the termios state should be kept even if the tty
221 * has been closed --- for things like the baud rate, etc --- it is
222 * not stored here, but rather a pointer to the real state is stored
223 * here. Possible the winsize structure should have the same
224 * treatment, but (1) the default 80x24 is usually right and (2) it's
225 * most often used by a windowing system, which will set the correct
226 * size each time the window is created or resized anyway.
227 * - TYT, 9/14/92
228 */
229
230 struct tty_operations;
231
232 struct tty_struct {
233 int magic;
234 struct kref kref;
235 struct device *dev;
236 struct tty_driver *driver;
237 const struct tty_operations *ops;
238 int index;
239
240 /* Protects ldisc changes: Lock tty not pty */
241 struct mutex ldisc_mutex;
242 struct tty_ldisc *ldisc;
243
244 struct mutex atomic_write_lock;
245 struct mutex legacy_mutex;
246 struct mutex termios_mutex;
247 spinlock_t ctrl_lock;
248 /* Termios values are protected by the termios mutex */
249 struct ktermios termios, termios_locked;
250 struct termiox *termiox; /* May be NULL for unsupported */
251 char name[64];
252 struct pid *pgrp; /* Protected by ctrl lock */
253 struct pid *session;
254 unsigned long flags;
255 int count;
256 struct winsize winsize; /* termios mutex */
257 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
258 unsigned char ctrl_status; /* ctrl_lock */
259 unsigned int receive_room; /* Bytes free for queue */
260 int flow_change;
261
262 struct tty_struct *link;
263 struct fasync_struct *fasync;
264 int alt_speed; /* For magic substitution of 38400 bps */
265 wait_queue_head_t write_wait;
266 wait_queue_head_t read_wait;
267 struct work_struct hangup_work;
268 void *disc_data;
269 void *driver_data;
270 struct list_head tty_files;
271
272 #define N_TTY_BUF_SIZE 4096
273
274 unsigned char closing:1;
275 unsigned short minimum_to_wake;
276 unsigned char *write_buf;
277 int write_cnt;
278 /* If the tty has a pending do_SAK, queue it here - akpm */
279 struct work_struct SAK_work;
280 struct tty_port *port;
281 };
282
283 /* Each of a tty's open files has private_data pointing to tty_file_private */
284 struct tty_file_private {
285 struct tty_struct *tty;
286 struct file *file;
287 struct list_head list;
288 };
289
290 /* tty magic number */
291 #define TTY_MAGIC 0x5401
292
293 /*
294 * These bits are used in the flags field of the tty structure.
295 *
296 * So that interrupts won't be able to mess up the queues,
297 * copy_to_cooked must be atomic with respect to itself, as must
298 * tty->write. Thus, you must use the inline functions set_bit() and
299 * clear_bit() to make things atomic.
300 */
301 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
302 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
303 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
304 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
305 #define TTY_DEBUG 4 /* Debugging */
306 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
307 #define TTY_PUSH 6 /* n_tty private */
308 #define TTY_CLOSING 7 /* ->close() in progress */
309 #define TTY_LDISC 9 /* Line discipline attached */
310 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
311 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
312 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
313 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
314 #define TTY_PTY_LOCK 16 /* pty private */
315 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
316 #define TTY_HUPPED 18 /* Post driver->hangup() */
317 #define TTY_HUPPING 21 /* ->hangup() in progress */
318 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
319
320 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
321
322 /* Values for tty->flow_change */
323 #define TTY_THROTTLE_SAFE 1
324 #define TTY_UNTHROTTLE_SAFE 2
325
__tty_set_flow_change(struct tty_struct * tty,int val)326 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
327 {
328 tty->flow_change = val;
329 }
330
tty_set_flow_change(struct tty_struct * tty,int val)331 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
332 {
333 tty->flow_change = val;
334 smp_mb();
335 }
336
337 #ifdef CONFIG_TTY
338 extern void console_init(void);
339 extern void tty_kref_put(struct tty_struct *tty);
340 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
341 extern void tty_vhangup_self(void);
342 extern void disassociate_ctty(int priv);
343 extern dev_t tty_devnum(struct tty_struct *tty);
344 extern void proc_clear_tty(struct task_struct *p);
345 extern struct tty_struct *get_current_tty(void);
346 /* tty_io.c */
347 extern int __init tty_init(void);
348 #else
console_init(void)349 static inline void console_init(void)
350 { }
tty_kref_put(struct tty_struct * tty)351 static inline void tty_kref_put(struct tty_struct *tty)
352 { }
tty_get_pgrp(struct tty_struct * tty)353 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
354 { return NULL; }
tty_vhangup_self(void)355 static inline void tty_vhangup_self(void)
356 { }
disassociate_ctty(int priv)357 static inline void disassociate_ctty(int priv)
358 { }
tty_devnum(struct tty_struct * tty)359 static inline dev_t tty_devnum(struct tty_struct *tty)
360 { return 0; }
proc_clear_tty(struct task_struct * p)361 static inline void proc_clear_tty(struct task_struct *p)
362 { }
get_current_tty(void)363 static inline struct tty_struct *get_current_tty(void)
364 { return NULL; }
365 /* tty_io.c */
tty_init(void)366 static inline int __init tty_init(void)
367 { return 0; }
368 #endif
369
370 extern void tty_write_flush(struct tty_struct *);
371
372 extern struct ktermios tty_std_termios;
373
374 extern int vcs_init(void);
375
376 extern struct class *tty_class;
377
378 /**
379 * tty_kref_get - get a tty reference
380 * @tty: tty device
381 *
382 * Return a new reference to a tty object. The caller must hold
383 * sufficient locks/counts to ensure that their existing reference cannot
384 * go away
385 */
386
tty_kref_get(struct tty_struct * tty)387 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
388 {
389 if (tty)
390 kref_get(&tty->kref);
391 return tty;
392 }
393
394 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
395 const char *routine);
396 extern char *tty_name(struct tty_struct *tty, char *buf);
397 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
398 extern int tty_check_change(struct tty_struct *tty);
399 extern void stop_tty(struct tty_struct *tty);
400 extern void start_tty(struct tty_struct *tty);
401 extern int tty_register_driver(struct tty_driver *driver);
402 extern int tty_unregister_driver(struct tty_driver *driver);
403 extern struct device *tty_register_device(struct tty_driver *driver,
404 unsigned index, struct device *dev);
405 extern struct device *tty_register_device_attr(struct tty_driver *driver,
406 unsigned index, struct device *device,
407 void *drvdata,
408 const struct attribute_group **attr_grp);
409 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
410 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
411 int buflen);
412 extern void tty_write_message(struct tty_struct *tty, char *msg);
413 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
414 extern int tty_chars_in_buffer(struct tty_struct *tty);
415 extern int tty_write_room(struct tty_struct *tty);
416 extern void tty_driver_flush_buffer(struct tty_struct *tty);
417 extern void tty_throttle(struct tty_struct *tty);
418 extern void tty_unthrottle(struct tty_struct *tty);
419 extern int tty_throttle_safe(struct tty_struct *tty);
420 extern int tty_unthrottle_safe(struct tty_struct *tty);
421 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
422 extern void tty_driver_remove_tty(struct tty_driver *driver,
423 struct tty_struct *tty);
424 extern void tty_free_termios(struct tty_struct *tty);
425 extern int is_current_pgrp_orphaned(void);
426 extern int is_ignored(int sig);
427 extern int tty_signal(int sig, struct tty_struct *tty);
428 extern void tty_hangup(struct tty_struct *tty);
429 extern void tty_vhangup(struct tty_struct *tty);
430 extern void tty_vhangup_locked(struct tty_struct *tty);
431 extern void tty_unhangup(struct file *filp);
432 extern int tty_hung_up_p(struct file *filp);
433 extern void do_SAK(struct tty_struct *tty);
434 extern void __do_SAK(struct tty_struct *tty);
435 extern void no_tty(void);
436 extern void tty_flush_to_ldisc(struct tty_struct *tty);
437 extern void tty_buffer_free_all(struct tty_port *port);
438 extern void tty_buffer_flush(struct tty_struct *tty);
439 extern void tty_buffer_init(struct tty_port *port);
440 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
441 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
442 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
443 speed_t ibaud, speed_t obaud);
444 extern void tty_encode_baud_rate(struct tty_struct *tty,
445 speed_t ibaud, speed_t obaud);
446
447 /**
448 * tty_get_baud_rate - get tty bit rates
449 * @tty: tty to query
450 *
451 * Returns the baud rate as an integer for this terminal. The
452 * termios lock must be held by the caller and the terminal bit
453 * flags may be updated.
454 *
455 * Locking: none
456 */
tty_get_baud_rate(struct tty_struct * tty)457 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
458 {
459 return tty_termios_baud_rate(&tty->termios);
460 }
461
462 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
463 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
464 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
465
466 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
467 extern void tty_ldisc_deref(struct tty_ldisc *);
468 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
469 extern void tty_ldisc_hangup(struct tty_struct *tty);
470 extern const struct file_operations tty_ldiscs_proc_fops;
471
472 extern void tty_wakeup(struct tty_struct *tty);
473 extern void tty_ldisc_flush(struct tty_struct *tty);
474
475 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
476 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
477 unsigned int cmd, unsigned long arg);
478 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
479 extern void tty_default_fops(struct file_operations *fops);
480 extern struct tty_struct *alloc_tty_struct(void);
481 extern int tty_alloc_file(struct file *file);
482 extern void tty_add_file(struct tty_struct *tty, struct file *file);
483 extern void tty_free_file(struct file *file);
484 extern void free_tty_struct(struct tty_struct *tty);
485 extern void initialize_tty_struct(struct tty_struct *tty,
486 struct tty_driver *driver, int idx);
487 extern void deinitialize_tty_struct(struct tty_struct *tty);
488 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
489 extern int tty_release(struct inode *inode, struct file *filp);
490 extern int tty_init_termios(struct tty_struct *tty);
491 extern int tty_standard_install(struct tty_driver *driver,
492 struct tty_struct *tty);
493
494 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
495 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
496
497 extern struct mutex tty_mutex;
498 extern spinlock_t tty_files_lock;
499
500 extern void tty_write_unlock(struct tty_struct *tty);
501 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
502 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
503
504 extern void tty_port_init(struct tty_port *port);
505 extern void tty_port_link_device(struct tty_port *port,
506 struct tty_driver *driver, unsigned index);
507 extern struct device *tty_port_register_device(struct tty_port *port,
508 struct tty_driver *driver, unsigned index,
509 struct device *device);
510 extern struct device *tty_port_register_device_attr(struct tty_port *port,
511 struct tty_driver *driver, unsigned index,
512 struct device *device, void *drvdata,
513 const struct attribute_group **attr_grp);
514 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
515 extern void tty_port_free_xmit_buf(struct tty_port *port);
516 extern void tty_port_destroy(struct tty_port *port);
517 extern void tty_port_put(struct tty_port *port);
518
tty_port_get(struct tty_port * port)519 static inline struct tty_port *tty_port_get(struct tty_port *port)
520 {
521 if (port)
522 kref_get(&port->kref);
523 return port;
524 }
525
526 /* If the cts flow control is enabled, return true. */
tty_port_cts_enabled(struct tty_port * port)527 static inline bool tty_port_cts_enabled(struct tty_port *port)
528 {
529 return port->flags & ASYNC_CTS_FLOW;
530 }
531
532 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
533 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
534 extern int tty_port_carrier_raised(struct tty_port *port);
535 extern void tty_port_raise_dtr_rts(struct tty_port *port);
536 extern void tty_port_lower_dtr_rts(struct tty_port *port);
537 extern void tty_port_hangup(struct tty_port *port);
538 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
539 extern void tty_port_tty_wakeup(struct tty_port *port);
540 extern int tty_port_block_til_ready(struct tty_port *port,
541 struct tty_struct *tty, struct file *filp);
542 extern int tty_port_close_start(struct tty_port *port,
543 struct tty_struct *tty, struct file *filp);
544 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
545 extern void tty_port_close(struct tty_port *port,
546 struct tty_struct *tty, struct file *filp);
547 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
548 struct tty_struct *tty);
549 extern int tty_port_open(struct tty_port *port,
550 struct tty_struct *tty, struct file *filp);
tty_port_users(struct tty_port * port)551 static inline int tty_port_users(struct tty_port *port)
552 {
553 return port->count + port->blocked_open;
554 }
555
556 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
557 extern int tty_unregister_ldisc(int disc);
558 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
559 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
560 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
561 extern void tty_ldisc_init(struct tty_struct *tty);
562 extern void tty_ldisc_deinit(struct tty_struct *tty);
563 extern void tty_ldisc_begin(void);
564
565
566 /* n_tty.c */
567 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
568 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
569
570 /* tty_audit.c */
571 #ifdef CONFIG_AUDIT
572 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
573 size_t size, unsigned icanon);
574 extern void tty_audit_exit(void);
575 extern void tty_audit_fork(struct signal_struct *sig);
576 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
577 extern void tty_audit_push(struct tty_struct *tty);
578 extern int tty_audit_push_current(void);
579 #else
tty_audit_add_data(struct tty_struct * tty,unsigned char * data,size_t size,unsigned icanon)580 static inline void tty_audit_add_data(struct tty_struct *tty,
581 unsigned char *data, size_t size, unsigned icanon)
582 {
583 }
tty_audit_tiocsti(struct tty_struct * tty,char ch)584 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
585 {
586 }
tty_audit_exit(void)587 static inline void tty_audit_exit(void)
588 {
589 }
tty_audit_fork(struct signal_struct * sig)590 static inline void tty_audit_fork(struct signal_struct *sig)
591 {
592 }
tty_audit_push(struct tty_struct * tty)593 static inline void tty_audit_push(struct tty_struct *tty)
594 {
595 }
tty_audit_push_current(void)596 static inline int tty_audit_push_current(void)
597 {
598 return 0;
599 }
600 #endif
601
602 /* tty_ioctl.c */
603 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
604 unsigned int cmd, unsigned long arg);
605 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
606 unsigned int cmd, unsigned long arg);
607
608 /* serial.c */
609
610 extern void serial_console_init(void);
611
612 /* pcxx.c */
613
614 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
615
616 /* vt.c */
617
618 extern int vt_ioctl(struct tty_struct *tty,
619 unsigned int cmd, unsigned long arg);
620
621 extern long vt_compat_ioctl(struct tty_struct *tty,
622 unsigned int cmd, unsigned long arg);
623
624 /* tty_mutex.c */
625 /* functions for preparation of BKL removal */
626 extern void __lockfunc tty_lock(struct tty_struct *tty);
627 extern void __lockfunc tty_unlock(struct tty_struct *tty);
628 extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
629 struct tty_struct *tty2);
630 extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
631 struct tty_struct *tty2);
632
633 /*
634 * this shall be called only from where BTM is held (like close)
635 *
636 * We need this to ensure nobody waits for us to finish while we are waiting.
637 * Without this we were encountering system stalls.
638 *
639 * This should be indeed removed with BTM removal later.
640 *
641 * Locking: BTM required. Nobody is allowed to hold port->mutex.
642 */
tty_wait_until_sent_from_close(struct tty_struct * tty,long timeout)643 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
644 long timeout)
645 {
646 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
647 tty_wait_until_sent(tty, timeout);
648 tty_lock(tty);
649 }
650
651 /*
652 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
653 *
654 * The condition we are waiting for might take a long time to
655 * become true, or might depend on another thread taking the
656 * BTM. In either case, we need to drop the BTM to guarantee
657 * forward progress. This is a leftover from the conversion
658 * from the BKL and should eventually get removed as the BTM
659 * falls out of use.
660 *
661 * Do not use in new code.
662 */
663 #define wait_event_interruptible_tty(tty, wq, condition) \
664 ({ \
665 int __ret = 0; \
666 if (!(condition)) { \
667 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
668 } \
669 __ret; \
670 })
671
672 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
673 do { \
674 DEFINE_WAIT(__wait); \
675 \
676 for (;;) { \
677 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
678 if (condition) \
679 break; \
680 if (!signal_pending(current)) { \
681 tty_unlock(tty); \
682 schedule(); \
683 tty_lock(tty); \
684 continue; \
685 } \
686 ret = -ERESTARTSYS; \
687 break; \
688 } \
689 finish_wait(&wq, &__wait); \
690 } while (0)
691
692 #ifdef CONFIG_PROC_FS
693 extern void proc_tty_register_driver(struct tty_driver *);
694 extern void proc_tty_unregister_driver(struct tty_driver *);
695 #else
proc_tty_register_driver(struct tty_driver * d)696 static inline void proc_tty_register_driver(struct tty_driver *d) {}
proc_tty_unregister_driver(struct tty_driver * d)697 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
698 #endif
699
700 #endif
701