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