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1da177e4 LT |
1 | #ifndef _LINUX_TTY_DRIVER_H |
2 | #define _LINUX_TTY_DRIVER_H | |
3 | ||
4 | /* | |
5 | * This structure defines the interface between the low-level tty | |
6 | * driver and the tty routines. The following routines can be | |
7 | * defined; unless noted otherwise, they are optional, and can be | |
8 | * filled in with a null pointer. | |
9 | * | |
99f1fe18 AC |
10 | * struct tty_struct * (*lookup)(struct tty_driver *self, int idx) |
11 | * | |
12 | * Return the tty device corresponding to idx, NULL if there is not | |
13 | * one currently in use and an ERR_PTR value on error. Called under | |
14 | * tty_mutex (for now!) | |
15 | * | |
16 | * Optional method. Default behaviour is to use the ttys array | |
17 | * | |
8b0a88d5 AC |
18 | * int (*install)(struct tty_driver *self, struct tty_struct *tty) |
19 | * | |
20 | * Install a new tty into the tty driver internal tables. Used in | |
21 | * conjunction with lookup and remove methods. | |
22 | * | |
23 | * Optional method. Default behaviour is to use the ttys array | |
24 | * | |
25 | * void (*remove)(struct tty_driver *self, struct tty_struct *tty) | |
26 | * | |
27 | * Remove a closed tty from the tty driver internal tables. Used in | |
28 | * conjunction with lookup and remove methods. | |
29 | * | |
30 | * Optional method. Default behaviour is to use the ttys array | |
31 | * | |
1da177e4 LT |
32 | * int (*open)(struct tty_struct * tty, struct file * filp); |
33 | * | |
34 | * This routine is called when a particular tty device is opened. | |
35 | * This routine is mandatory; if this routine is not filled in, | |
36 | * the attempted open will fail with ENODEV. | |
f34d7a5b AC |
37 | * |
38 | * Required method. | |
1da177e4 LT |
39 | * |
40 | * void (*close)(struct tty_struct * tty, struct file * filp); | |
41 | * | |
42 | * This routine is called when a particular tty device is closed. | |
43 | * | |
f34d7a5b AC |
44 | * Required method. |
45 | * | |
feebed65 AC |
46 | * void (*shutdown)(struct tty_struct * tty); |
47 | * | |
f278a2f7 DY |
48 | * This routine is called synchronously when a particular tty device |
49 | * is closed for the last time freeing up the resources. | |
24d406a6 JS |
50 | * Note that tty_shutdown() is not called if ops->shutdown is defined. |
51 | * This means one is responsible to take care of calling ops->remove (e.g. | |
52 | * via tty_driver_remove_tty) and releasing tty->termios. | |
f278a2f7 DY |
53 | * |
54 | * | |
55 | * void (*cleanup)(struct tty_struct * tty); | |
56 | * | |
57 | * This routine is called asynchronously when a particular tty device | |
58 | * is closed for the last time freeing up the resources. This is | |
59 | * actually the second part of shutdown for routines that might sleep. | |
60 | * | |
feebed65 | 61 | * |
1da177e4 LT |
62 | * int (*write)(struct tty_struct * tty, |
63 | * const unsigned char *buf, int count); | |
64 | * | |
65 | * This routine is called by the kernel to write a series of | |
66 | * characters to the tty device. The characters may come from | |
67 | * user space or kernel space. This routine will return the | |
36c7343b | 68 | * number of characters actually accepted for writing. |
1da177e4 | 69 | * |
f34d7a5b AC |
70 | * Optional: Required for writable devices. |
71 | * | |
72 | * int (*put_char)(struct tty_struct *tty, unsigned char ch); | |
1da177e4 LT |
73 | * |
74 | * This routine is called by the kernel to write a single | |
75 | * character to the tty device. If the kernel uses this routine, | |
76 | * it must call the flush_chars() routine (if defined) when it is | |
77 | * done stuffing characters into the driver. If there is no room | |
78 | * in the queue, the character is ignored. | |
79 | * | |
f34d7a5b AC |
80 | * Optional: Kernel will use the write method if not provided. |
81 | * | |
82 | * Note: Do not call this function directly, call tty_put_char | |
83 | * | |
1da177e4 LT |
84 | * void (*flush_chars)(struct tty_struct *tty); |
85 | * | |
86 | * This routine is called by the kernel after it has written a | |
87 | * series of characters to the tty device using put_char(). | |
f34d7a5b AC |
88 | * |
89 | * Optional: | |
90 | * | |
91 | * Note: Do not call this function directly, call tty_driver_flush_chars | |
1da177e4 LT |
92 | * |
93 | * int (*write_room)(struct tty_struct *tty); | |
94 | * | |
95 | * This routine returns the numbers of characters the tty driver | |
96 | * will accept for queuing to be written. This number is subject | |
97 | * to change as output buffers get emptied, or if the output flow | |
98 | * control is acted. | |
f34d7a5b AC |
99 | * |
100 | * Required if write method is provided else not needed. | |
101 | * | |
102 | * Note: Do not call this function directly, call tty_write_room | |
1da177e4 | 103 | * |
6caa76b7 | 104 | * int (*ioctl)(struct tty_struct *tty, unsigned int cmd, unsigned long arg); |
1da177e4 LT |
105 | * |
106 | * This routine allows the tty driver to implement | |
6ce5b1ce | 107 | * device-specific ioctls. If the ioctl number passed in cmd |
1da177e4 | 108 | * is not recognized by the driver, it should return ENOIOCTLCMD. |
e10cc1df | 109 | * |
f34d7a5b AC |
110 | * Optional |
111 | * | |
6caa76b7 | 112 | * long (*compat_ioctl)(struct tty_struct *tty,, |
e10cc1df PF |
113 | * unsigned int cmd, unsigned long arg); |
114 | * | |
115 | * implement ioctl processing for 32 bit process on 64 bit system | |
f34d7a5b AC |
116 | * |
117 | * Optional | |
1da177e4 | 118 | * |
edc6afc5 | 119 | * void (*set_termios)(struct tty_struct *tty, struct ktermios * old); |
1da177e4 LT |
120 | * |
121 | * This routine allows the tty driver to be notified when | |
f34d7a5b AC |
122 | * device's termios settings have changed. |
123 | * | |
124 | * Optional: Called under the termios lock | |
125 | * | |
1da177e4 LT |
126 | * |
127 | * void (*set_ldisc)(struct tty_struct *tty); | |
128 | * | |
129 | * This routine allows the tty driver to be notified when the | |
130 | * device's termios settings have changed. | |
f34d7a5b AC |
131 | * |
132 | * Optional: Called under BKL (currently) | |
1da177e4 LT |
133 | * |
134 | * void (*throttle)(struct tty_struct * tty); | |
135 | * | |
136 | * This routine notifies the tty driver that input buffers for | |
137 | * the line discipline are close to full, and it should somehow | |
138 | * signal that no more characters should be sent to the tty. | |
39c2e60f | 139 | * |
38db8979 AC |
140 | * Optional: Always invoke via tty_throttle(), called under the |
141 | * termios lock. | |
1da177e4 LT |
142 | * |
143 | * void (*unthrottle)(struct tty_struct * tty); | |
144 | * | |
145 | * This routine notifies the tty drivers that it should signals | |
146 | * that characters can now be sent to the tty without fear of | |
147 | * overrunning the input buffers of the line disciplines. | |
148 | * | |
38db8979 AC |
149 | * Optional: Always invoke via tty_unthrottle(), called under the |
150 | * termios lock. | |
39c2e60f | 151 | * |
1da177e4 LT |
152 | * void (*stop)(struct tty_struct *tty); |
153 | * | |
154 | * This routine notifies the tty driver that it should stop | |
155 | * outputting characters to the tty device. | |
f34d7a5b AC |
156 | * |
157 | * Optional: | |
158 | * | |
159 | * Note: Call stop_tty not this method. | |
1da177e4 LT |
160 | * |
161 | * void (*start)(struct tty_struct *tty); | |
162 | * | |
163 | * This routine notifies the tty driver that it resume sending | |
164 | * characters to the tty device. | |
f34d7a5b AC |
165 | * |
166 | * Optional: | |
167 | * | |
168 | * Note: Call start_tty not this method. | |
1da177e4 LT |
169 | * |
170 | * void (*hangup)(struct tty_struct *tty); | |
171 | * | |
6ce5b1ce | 172 | * This routine notifies the tty driver that it should hang up the |
1da177e4 LT |
173 | * tty device. |
174 | * | |
36c7343b | 175 | * Optional: |
f34d7a5b | 176 | * |
6ce5b1ce | 177 | * int (*break_ctl)(struct tty_struct *tty, int state); |
1da177e4 LT |
178 | * |
179 | * This optional routine requests the tty driver to turn on or | |
180 | * off BREAK status on the RS-232 port. If state is -1, | |
181 | * then the BREAK status should be turned on; if state is 0, then | |
182 | * BREAK should be turned off. | |
183 | * | |
184 | * If this routine is implemented, the high-level tty driver will | |
185 | * handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK, | |
f34d7a5b AC |
186 | * TIOCCBRK. |
187 | * | |
9e98966c AC |
188 | * If the driver sets TTY_DRIVER_HARDWARE_BREAK then the interface |
189 | * will also be called with actual times and the hardware is expected | |
190 | * to do the delay work itself. 0 and -1 are still used for on/off. | |
191 | * | |
f34d7a5b | 192 | * Optional: Required for TCSBRK/BRKP/etc handling. |
1da177e4 LT |
193 | * |
194 | * void (*wait_until_sent)(struct tty_struct *tty, int timeout); | |
195 | * | |
196 | * This routine waits until the device has written out all of the | |
197 | * characters in its transmitter FIFO. | |
198 | * | |
f34d7a5b AC |
199 | * Optional: If not provided the device is assumed to have no FIFO |
200 | * | |
201 | * Note: Usually correct to call tty_wait_until_sent | |
202 | * | |
1da177e4 LT |
203 | * void (*send_xchar)(struct tty_struct *tty, char ch); |
204 | * | |
205 | * This routine is used to send a high-priority XON/XOFF | |
206 | * character to the device. | |
f34d7a5b AC |
207 | * |
208 | * Optional: If not provided then the write method is called under | |
209 | * the atomic write lock to keep it serialized with the ldisc. | |
8c9a9dd0 | 210 | * |
fc6f6238 | 211 | * int (*resize)(struct tty_struct *tty, struct winsize *ws) |
8c9a9dd0 AC |
212 | * |
213 | * Called when a termios request is issued which changes the | |
214 | * requested terminal geometry. | |
215 | * | |
216 | * Optional: the default action is to update the termios structure | |
217 | * without error. This is usually the correct behaviour. Drivers should | |
218 | * not force errors here if they are not resizable objects (eg a serial | |
219 | * line). See tty_do_resize() if you need to wrap the standard method | |
220 | * in your own logic - the usual case. | |
1d65b4a0 AC |
221 | * |
222 | * void (*set_termiox)(struct tty_struct *tty, struct termiox *new); | |
223 | * | |
224 | * Called when the device receives a termiox based ioctl. Passes down | |
225 | * the requested data from user space. This method will not be invoked | |
226 | * unless the tty also has a valid tty->termiox pointer. | |
227 | * | |
228 | * Optional: Called under the termios lock | |
d281da7f AC |
229 | * |
230 | * int (*get_icount)(struct tty_struct *tty, struct serial_icounter *icount); | |
231 | * | |
232 | * Called when the device receives a TIOCGICOUNT ioctl. Passed a kernel | |
233 | * structure to complete. This method is optional and will only be called | |
234 | * if provided (otherwise EINVAL will be returned). | |
1da177e4 LT |
235 | */ |
236 | ||
237 | #include <linux/fs.h> | |
238 | #include <linux/list.h> | |
239 | #include <linux/cdev.h> | |
3dfbd044 | 240 | #include <linux/termios.h> |
1da177e4 LT |
241 | |
242 | struct tty_struct; | |
f2d937f3 | 243 | struct tty_driver; |
d281da7f | 244 | struct serial_icounter_struct; |
1da177e4 LT |
245 | |
246 | struct tty_operations { | |
15f1a633 SB |
247 | struct tty_struct * (*lookup)(struct tty_driver *driver, |
248 | struct inode *inode, int idx); | |
8b0a88d5 AC |
249 | int (*install)(struct tty_driver *driver, struct tty_struct *tty); |
250 | void (*remove)(struct tty_driver *driver, struct tty_struct *tty); | |
1da177e4 LT |
251 | int (*open)(struct tty_struct * tty, struct file * filp); |
252 | void (*close)(struct tty_struct * tty, struct file * filp); | |
feebed65 | 253 | void (*shutdown)(struct tty_struct *tty); |
f278a2f7 | 254 | void (*cleanup)(struct tty_struct *tty); |
1da177e4 LT |
255 | int (*write)(struct tty_struct * tty, |
256 | const unsigned char *buf, int count); | |
f34d7a5b | 257 | int (*put_char)(struct tty_struct *tty, unsigned char ch); |
1da177e4 LT |
258 | void (*flush_chars)(struct tty_struct *tty); |
259 | int (*write_room)(struct tty_struct *tty); | |
260 | int (*chars_in_buffer)(struct tty_struct *tty); | |
6caa76b7 | 261 | int (*ioctl)(struct tty_struct *tty, |
1da177e4 | 262 | unsigned int cmd, unsigned long arg); |
6caa76b7 | 263 | long (*compat_ioctl)(struct tty_struct *tty, |
e10cc1df | 264 | unsigned int cmd, unsigned long arg); |
edc6afc5 | 265 | void (*set_termios)(struct tty_struct *tty, struct ktermios * old); |
1da177e4 LT |
266 | void (*throttle)(struct tty_struct * tty); |
267 | void (*unthrottle)(struct tty_struct * tty); | |
268 | void (*stop)(struct tty_struct *tty); | |
269 | void (*start)(struct tty_struct *tty); | |
270 | void (*hangup)(struct tty_struct *tty); | |
9e98966c | 271 | int (*break_ctl)(struct tty_struct *tty, int state); |
1da177e4 LT |
272 | void (*flush_buffer)(struct tty_struct *tty); |
273 | void (*set_ldisc)(struct tty_struct *tty); | |
274 | void (*wait_until_sent)(struct tty_struct *tty, int timeout); | |
275 | void (*send_xchar)(struct tty_struct *tty, char ch); | |
60b33c13 | 276 | int (*tiocmget)(struct tty_struct *tty); |
20b9d177 | 277 | int (*tiocmset)(struct tty_struct *tty, |
1da177e4 | 278 | unsigned int set, unsigned int clear); |
fc6f6238 | 279 | int (*resize)(struct tty_struct *tty, struct winsize *ws); |
1d65b4a0 | 280 | int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew); |
d281da7f AC |
281 | int (*get_icount)(struct tty_struct *tty, |
282 | struct serial_icounter_struct *icount); | |
f2d937f3 JW |
283 | #ifdef CONFIG_CONSOLE_POLL |
284 | int (*poll_init)(struct tty_driver *driver, int line, char *options); | |
285 | int (*poll_get_char)(struct tty_driver *driver, int line); | |
286 | void (*poll_put_char)(struct tty_driver *driver, int line, char ch); | |
287 | #endif | |
ae149b6b | 288 | const struct file_operations *proc_fops; |
1da177e4 LT |
289 | }; |
290 | ||
291 | struct tty_driver { | |
292 | int magic; /* magic number for this structure */ | |
7d7b93c1 | 293 | struct kref kref; /* Reference management */ |
1da177e4 LT |
294 | struct cdev cdev; |
295 | struct module *owner; | |
296 | const char *driver_name; | |
1da177e4 LT |
297 | const char *name; |
298 | int name_base; /* offset of printed name */ | |
299 | int major; /* major device number */ | |
300 | int minor_start; /* start of minor device number */ | |
301 | int minor_num; /* number of *possible* devices */ | |
302 | int num; /* number of devices allocated */ | |
303 | short type; /* type of tty driver */ | |
304 | short subtype; /* subtype of tty driver */ | |
edc6afc5 | 305 | struct ktermios init_termios; /* Initial termios */ |
1da177e4 | 306 | int flags; /* tty driver flags */ |
1da177e4 LT |
307 | struct proc_dir_entry *proc_entry; /* /proc fs entry */ |
308 | struct tty_driver *other; /* only used for the PTY driver */ | |
309 | ||
310 | /* | |
311 | * Pointer to the tty data structures | |
312 | */ | |
313 | struct tty_struct **ttys; | |
edc6afc5 | 314 | struct ktermios **termios; |
f34d7a5b AC |
315 | void *driver_state; |
316 | ||
1da177e4 | 317 | /* |
f34d7a5b | 318 | * Driver methods |
1da177e4 | 319 | */ |
1da177e4 | 320 | |
f34d7a5b | 321 | const struct tty_operations *ops; |
1da177e4 LT |
322 | struct list_head tty_drivers; |
323 | }; | |
324 | ||
325 | extern struct list_head tty_drivers; | |
326 | ||
7d7b93c1 AC |
327 | extern struct tty_driver *alloc_tty_driver(int lines); |
328 | extern void put_tty_driver(struct tty_driver *driver); | |
329 | extern void tty_set_operations(struct tty_driver *driver, | |
b68e31d0 | 330 | const struct tty_operations *op); |
f2d937f3 | 331 | extern struct tty_driver *tty_find_polling_driver(char *name, int *line); |
1da177e4 | 332 | |
7d7b93c1 | 333 | extern void tty_driver_kref_put(struct tty_driver *driver); |
f786ddd2 AB |
334 | |
335 | static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d) | |
7d7b93c1 AC |
336 | { |
337 | kref_get(&d->kref); | |
338 | return d; | |
339 | } | |
340 | ||
1da177e4 LT |
341 | /* tty driver magic number */ |
342 | #define TTY_DRIVER_MAGIC 0x5402 | |
343 | ||
344 | /* | |
345 | * tty driver flags | |
346 | * | |
347 | * TTY_DRIVER_RESET_TERMIOS --- requests the tty layer to reset the | |
348 | * termios setting when the last process has closed the device. | |
349 | * Used for PTY's, in particular. | |
350 | * | |
351 | * TTY_DRIVER_REAL_RAW --- if set, indicates that the driver will | |
352 | * guarantee never not to set any special character handling | |
353 | * flags if ((IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR || | |
354 | * !INPCK)). That is, if there is no reason for the driver to | |
355 | * send notifications of parity and break characters up to the | |
356 | * line driver, it won't do so. This allows the line driver to | |
357 | * optimize for this case if this flag is set. (Note that there | |
358 | * is also a promise, if the above case is true, not to signal | |
359 | * overruns, either.) | |
360 | * | |
331b8319 | 361 | * TTY_DRIVER_DYNAMIC_DEV --- if set, the individual tty devices need |
6ce5b1ce | 362 | * to be registered with a call to tty_register_device() when the |
331b8319 GKH |
363 | * device is found in the system and unregistered with a call to |
364 | * tty_unregister_device() so the devices will be show up | |
365 | * properly in sysfs. If not set, driver->num entries will be | |
366 | * created by the tty core in sysfs when tty_register_driver() is | |
367 | * called. This is to be used by drivers that have tty devices | |
368 | * that can appear and disappear while the main tty driver is | |
369 | * registered with the tty core. | |
1da177e4 LT |
370 | * |
371 | * TTY_DRIVER_DEVPTS_MEM -- don't use the standard arrays, instead | |
372 | * use dynamic memory keyed through the devpts filesystem. This | |
373 | * is only applicable to the pty driver. | |
9e98966c AC |
374 | * |
375 | * TTY_DRIVER_HARDWARE_BREAK -- hardware handles break signals. Pass | |
376 | * the requested timeout to the caller instead of using a simple | |
377 | * on/off interface. | |
378 | * | |
1da177e4 LT |
379 | */ |
380 | #define TTY_DRIVER_INSTALLED 0x0001 | |
381 | #define TTY_DRIVER_RESET_TERMIOS 0x0002 | |
382 | #define TTY_DRIVER_REAL_RAW 0x0004 | |
331b8319 | 383 | #define TTY_DRIVER_DYNAMIC_DEV 0x0008 |
1da177e4 | 384 | #define TTY_DRIVER_DEVPTS_MEM 0x0010 |
9e98966c | 385 | #define TTY_DRIVER_HARDWARE_BREAK 0x0020 |
1da177e4 LT |
386 | |
387 | /* tty driver types */ | |
388 | #define TTY_DRIVER_TYPE_SYSTEM 0x0001 | |
389 | #define TTY_DRIVER_TYPE_CONSOLE 0x0002 | |
390 | #define TTY_DRIVER_TYPE_SERIAL 0x0003 | |
391 | #define TTY_DRIVER_TYPE_PTY 0x0004 | |
392 | #define TTY_DRIVER_TYPE_SCC 0x0005 /* scc driver */ | |
393 | #define TTY_DRIVER_TYPE_SYSCONS 0x0006 | |
394 | ||
395 | /* system subtypes (magic, used by tty_io.c) */ | |
396 | #define SYSTEM_TYPE_TTY 0x0001 | |
397 | #define SYSTEM_TYPE_CONSOLE 0x0002 | |
398 | #define SYSTEM_TYPE_SYSCONS 0x0003 | |
399 | #define SYSTEM_TYPE_SYSPTMX 0x0004 | |
400 | ||
401 | /* pty subtypes (magic, used by tty_io.c) */ | |
402 | #define PTY_TYPE_MASTER 0x0001 | |
403 | #define PTY_TYPE_SLAVE 0x0002 | |
404 | ||
405 | /* serial subtype definitions */ | |
406 | #define SERIAL_TYPE_NORMAL 1 | |
407 | ||
408 | #endif /* #ifdef _LINUX_TTY_DRIVER_H */ |