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1 | #ifndef _LINUX_TTY_LDISC_H |
2 | #define _LINUX_TTY_LDISC_H |
3 | |
4 | /* |
5 | * This structure defines the interface between the tty line discipline |
6 | * implementation 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 | * |
10 | * int (*open)(struct tty_struct *); |
11 | * |
12 | * This function is called when the line discipline is associated |
13 | * with the tty. The line discipline can use this as an |
14 | * opportunity to initialize any state needed by the ldisc routines. |
15 | * |
16 | * void (*close)(struct tty_struct *); |
17 | * |
18 | * This function is called when the line discipline is being |
19 | * shutdown, either because the tty is being closed or because |
20 | * the tty is being changed to use a new line discipline |
21 | * |
22 | * void (*flush_buffer)(struct tty_struct *tty); |
23 | * |
24 | * This function instructs the line discipline to clear its |
25 | * buffers of any input characters it may have queued to be |
26 | * delivered to the user mode process. |
27 | * |
28 | * ssize_t (*chars_in_buffer)(struct tty_struct *tty); |
29 | * |
30 | * This function returns the number of input characters the line |
31 | * discipline may have queued up to be delivered to the user mode |
32 | * process. |
33 | * |
34 | * ssize_t (*read)(struct tty_struct * tty, struct file * file, |
35 | * unsigned char * buf, size_t nr); |
36 | * |
37 | * This function is called when the user requests to read from |
38 | * the tty. The line discipline will return whatever characters |
39 | * it has buffered up for the user. If this function is not |
40 | * defined, the user will receive an EIO error. |
41 | * |
42 | * ssize_t (*write)(struct tty_struct * tty, struct file * file, |
43 | * const unsigned char * buf, size_t nr); |
44 | * |
45 | * This function is called when the user requests to write to the |
46 | * tty. The line discipline will deliver the characters to the |
47 | * low-level tty device for transmission, optionally performing |
48 | * some processing on the characters first. If this function is |
49 | * not defined, the user will receive an EIO error. |
50 | * |
51 | * int (*ioctl)(struct tty_struct * tty, struct file * file, |
52 | * unsigned int cmd, unsigned long arg); |
53 | * |
54 | * This function is called when the user requests an ioctl which |
55 | * is not handled by the tty layer or the low-level tty driver. |
56 | * It is intended for ioctls which affect line discpline |
57 | * operation. Note that the search order for ioctls is (1) tty |
58 | * layer, (2) tty low-level driver, (3) line discpline. So a |
59 | * low-level driver can "grab" an ioctl request before the line |
60 | * discpline has a chance to see it. |
61 | * |
62 | * long (*compat_ioctl)(struct tty_struct * tty, struct file * file, |
63 | * unsigned int cmd, unsigned long arg); |
64 | * |
65 | * Process ioctl calls from 32-bit process on 64-bit system |
66 | * |
67 | * void (*set_termios)(struct tty_struct *tty, struct ktermios * old); |
68 | * |
69 | * This function notifies the line discpline that a change has |
70 | * been made to the termios structure. |
71 | * |
72 | * int (*poll)(struct tty_struct * tty, struct file * file, |
73 | * poll_table *wait); |
74 | * |
75 | * This function is called when a user attempts to select/poll on a |
76 | * tty device. It is solely the responsibility of the line |
77 | * discipline to handle poll requests. |
78 | * |
79 | * void (*receive_buf)(struct tty_struct *, const unsigned char *cp, |
80 | * char *fp, int count); |
81 | * |
82 | * This function is called by the low-level tty driver to send |
83 | * characters received by the hardware to the line discpline for |
84 | * processing. <cp> is a pointer to the buffer of input |
85 | * character received by the device. <fp> is a pointer to a |
86 | * pointer of flag bytes which indicate whether a character was |
87 | * received with a parity error, etc. |
88 | * |
89 | * void (*write_wakeup)(struct tty_struct *); |
90 | * |
91 | * This function is called by the low-level tty driver to signal |
92 | * that line discpline should try to send more characters to the |
93 | * low-level driver for transmission. If the line discpline does |
94 | * not have any more data to send, it can just return. |
95 | * |
96 | * int (*hangup)(struct tty_struct *) |
97 | * |
98 | * Called on a hangup. Tells the discipline that it should |
99 | * cease I/O to the tty driver. Can sleep. The driver should |
100 | * seek to perform this action quickly but should wait until |
101 | * any pending driver I/O is completed. |
102 | * |
103 | * void (*fasync)(struct tty_struct *, int on) |
104 | * |
105 | * Notify line discipline when signal-driven I/O is enabled or |
106 | * disabled. |
107 | * |
108 | * void (*dcd_change)(struct tty_struct *tty, unsigned int status) |
109 | * |
110 | * Tells the discipline that the DCD pin has changed its status. |
111 | * Used exclusively by the N_PPS (Pulse-Per-Second) line discipline. |
112 | */ |
113 | |
114 | #include <linux/fs.h> |
115 | #include <linux/wait.h> |
116 | #include <linux/wait.h> |
117 | |
118 | |
119 | /* |
120 | * the semaphore definition |
121 | */ |
122 | struct ld_semaphore { |
123 | long count; |
124 | raw_spinlock_t wait_lock; |
125 | unsigned int wait_readers; |
126 | struct list_head read_wait; |
127 | struct list_head write_wait; |
128 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
129 | struct lockdep_map dep_map; |
130 | #endif |
131 | }; |
132 | |
133 | extern void __init_ldsem(struct ld_semaphore *sem, const char *name, |
134 | struct lock_class_key *key); |
135 | |
136 | #define init_ldsem(sem) \ |
137 | do { \ |
138 | static struct lock_class_key __key; \ |
139 | \ |
140 | __init_ldsem((sem), #sem, &__key); \ |
141 | } while (0) |
142 | |
143 | |
144 | extern int ldsem_down_read(struct ld_semaphore *sem, long timeout); |
145 | extern int ldsem_down_read_trylock(struct ld_semaphore *sem); |
146 | extern int ldsem_down_write(struct ld_semaphore *sem, long timeout); |
147 | extern int ldsem_down_write_trylock(struct ld_semaphore *sem); |
148 | extern void ldsem_up_read(struct ld_semaphore *sem); |
149 | extern void ldsem_up_write(struct ld_semaphore *sem); |
150 | |
151 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
152 | extern int ldsem_down_read_nested(struct ld_semaphore *sem, int subclass, |
153 | long timeout); |
154 | extern int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass, |
155 | long timeout); |
156 | #else |
157 | # define ldsem_down_read_nested(sem, subclass, timeout) \ |
158 | ldsem_down_read(sem, timeout) |
159 | # define ldsem_down_write_nested(sem, subclass, timeout) \ |
160 | ldsem_down_write(sem, timeout) |
161 | #endif |
162 | |
163 | |
164 | struct tty_ldisc_ops { |
165 | int magic; |
166 | char *name; |
167 | int num; |
168 | int flags; |
169 | |
170 | /* |
171 | * The following routines are called from above. |
172 | */ |
173 | int (*open)(struct tty_struct *); |
174 | void (*close)(struct tty_struct *); |
175 | void (*flush_buffer)(struct tty_struct *tty); |
176 | ssize_t (*chars_in_buffer)(struct tty_struct *tty); |
177 | ssize_t (*read)(struct tty_struct *tty, struct file *file, |
178 | unsigned char __user *buf, size_t nr); |
179 | ssize_t (*write)(struct tty_struct *tty, struct file *file, |
180 | const unsigned char *buf, size_t nr); |
181 | int (*ioctl)(struct tty_struct *tty, struct file *file, |
182 | unsigned int cmd, unsigned long arg); |
183 | long (*compat_ioctl)(struct tty_struct *tty, struct file *file, |
184 | unsigned int cmd, unsigned long arg); |
185 | void (*set_termios)(struct tty_struct *tty, struct ktermios *old); |
186 | unsigned int (*poll)(struct tty_struct *, struct file *, |
187 | struct poll_table_struct *); |
188 | int (*hangup)(struct tty_struct *tty); |
189 | |
190 | /* |
191 | * The following routines are called from below. |
192 | */ |
193 | void (*receive_buf)(struct tty_struct *, const unsigned char *cp, |
194 | char *fp, int count); |
195 | void (*write_wakeup)(struct tty_struct *); |
196 | void (*dcd_change)(struct tty_struct *, unsigned int); |
197 | void (*fasync)(struct tty_struct *tty, int on); |
198 | |
199 | struct module *owner; |
200 | |
201 | int refcount; |
202 | }; |
203 | |
204 | struct tty_ldisc { |
205 | struct tty_ldisc_ops *ops; |
206 | atomic_t users; |
207 | wait_queue_head_t wq_idle; |
208 | }; |
209 | |
210 | #define TTY_LDISC_MAGIC 0x5403 |
211 | |
212 | #define LDISC_FLAG_DEFINED 0x00000001 |
213 | |
214 | #define MODULE_ALIAS_LDISC(ldisc) \ |
215 | MODULE_ALIAS("tty-ldisc-" __stringify(ldisc)) |
216 | |
217 | #endif /* _LINUX_TTY_LDISC_H */ |
218 |
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