Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_TTY_H |
| 2 | #define _LINUX_TTY_H |
| 3 | |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 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> |
Alan Cox | ba3fe7a | 2012-09-04 16:35:08 +0100 | [diff] [blame] | 11 | #include <linux/tty_flags.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 12 | #include <uapi/linux/tty.h> |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 13 | |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 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 */ |
Konstantin Khlebnikov | e9aba51 | 2012-01-05 13:06:11 +0400 | [diff] [blame] | 21 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 22 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 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; |
Paul Fulghum | 8977d92 | 2006-02-10 01:51:14 -0800 | [diff] [blame] | 37 | int commit; |
| 38 | int read; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 39 | /* Data points here */ |
| 40 | unsigned long data[0]; |
| 41 | }; |
| 42 | |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 43 | /* |
| 44 | * We default to dicing tty buffer allocations to this many characters |
Mel Gorman | 352fa6a | 2010-03-02 22:24:19 +0000 | [diff] [blame] | 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 |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 49 | */ |
| 50 | |
Mel Gorman | 352fa6a | 2010-03-02 22:24:19 +0000 | [diff] [blame] | 51 | #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 52 | |
| 53 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 54 | struct tty_bufhead { |
Linus Torvalds | f23eb2b | 2011-03-22 16:17:32 -0700 | [diff] [blame] | 55 | struct work_struct work; |
Paul Fulghum | 808249c | 2006-02-03 03:04:41 -0800 | [diff] [blame] | 56 | spinlock_t lock; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 57 | struct tty_buffer *head; /* Queue head */ |
| 58 | struct tty_buffer *tail; /* Active buffer */ |
| 59 | struct tty_buffer *free; /* Free queue head */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 60 | int memory_used; /* Buffer space used excluding |
| 61 | free queue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | }; |
| 63 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 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]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 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)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 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) |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 153 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | struct device; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 156 | struct signal_struct; |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 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 | */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 168 | |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 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); |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 174 | /* Control the DTR line */ |
Alan Cox | fcc8ac1 | 2009-06-11 12:24:17 +0100 | [diff] [blame] | 175 | void (*dtr_rts)(struct tty_port *port, int raise); |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 176 | /* Called when the last close completes or a hangup finishes |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 177 | IFF the port was initialized. Do not use to free resources. Called |
| 178 | under the port mutex to serialize against activate/shutdowns */ |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 179 | void (*shutdown)(struct tty_port *port); |
| 180 | void (*drop)(struct tty_port *port); |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 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); |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 186 | /* Called on the final put of a port */ |
| 187 | void (*destruct)(struct tty_port *port); |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 188 | }; |
| 189 | |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 190 | struct tty_port { |
Jiri Slaby | ecbbfd4 | 2012-10-18 22:26:47 +0200 | [diff] [blame] | 191 | struct tty_bufhead buf; /* Locked internally */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 192 | struct tty_struct *tty; /* Back pointer */ |
Jiri Slaby | 967fab6 | 2012-10-18 22:26:46 +0200 | [diff] [blame] | 193 | struct tty_struct *itty; /* internal back ptr */ |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 194 | const struct tty_port_operations *ops; /* Port operations */ |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 195 | spinlock_t lock; /* Lock protecting tty field */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 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 */ |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 200 | wait_queue_head_t delta_msr_wait; /* Modem status change */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 201 | unsigned long flags; /* TTY flags ASY_*/ |
Jiri Slaby | 2fc2066 | 2012-10-18 22:26:44 +0200 | [diff] [blame] | 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 */ |
Jiri Slaby | d6c53c0 | 2013-01-03 15:53:05 +0100 | [diff] [blame] | 205 | unsigned char console:1, /* port is a console */ |
| 206 | low_latency:1; /* direct buffer flush */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 207 | struct mutex mutex; /* Locking */ |
Alan Cox | 44e4909 | 2009-11-30 13:16:41 +0000 | [diff] [blame] | 208 | struct mutex buf_mutex; /* Buffer alloc lock */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 209 | unsigned char *xmit_buf; /* Optional buffer */ |
Alan Cox | 5e99df5 | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 210 | unsigned int close_delay; /* Close port delay */ |
| 211 | unsigned int closing_wait; /* Delay for output */ |
Alan Cox | 1ec739b | 2009-06-11 12:25:25 +0100 | [diff] [blame] | 212 | int drain_delay; /* Set to zero if no pure time |
| 213 | based drain is needed else |
| 214 | set to size of fifo */ |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 215 | struct kref kref; /* Ref counter */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 216 | }; |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 229 | |
| 230 | struct tty_operations; |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | struct tty_struct { |
| 233 | int magic; |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 234 | struct kref kref; |
Dmitry Eremin-Solenikov | 30004ac | 2010-08-09 18:22:49 +0400 | [diff] [blame] | 235 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | struct tty_driver *driver; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 237 | const struct tty_operations *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | int index; |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 239 | |
| 240 | /* Protects ldisc changes: Lock tty not pty */ |
| 241 | struct mutex ldisc_mutex; |
| 242 | struct tty_ldisc *ldisc; |
| 243 | |
Jiri Slaby | bddc715 | 2012-10-18 22:26:42 +0200 | [diff] [blame] | 244 | struct mutex atomic_write_lock; |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 245 | struct mutex legacy_mutex; |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 246 | struct mutex termios_mutex; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 247 | spinlock_t ctrl_lock; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 248 | /* Termios values are protected by the termios mutex */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 249 | struct ktermios termios, termios_locked; |
Alan Cox | 1d65b4a | 2008-10-13 10:38:18 +0100 | [diff] [blame] | 250 | struct termiox *termiox; /* May be NULL for unsupported */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | char name[64]; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 252 | struct pid *pgrp; /* Protected by ctrl lock */ |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 253 | struct pid *session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | unsigned long flags; |
| 255 | int count; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 256 | struct winsize winsize; /* termios mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 258 | unsigned char ctrl_status; /* ctrl_lock */ |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 259 | unsigned int receive_room; /* Bytes free for queue */ |
Peter Hurley | 70bc126 | 2013-03-06 08:20:52 -0500 | [diff] [blame] | 260 | int flow_change; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | struct tty_struct *link; |
| 263 | struct fasync_struct *fasync; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | unsigned char closing:1; |
| 275 | unsigned short minimum_to_wake; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | unsigned char *write_buf; |
| 277 | int write_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | /* If the tty has a pending do_SAK, queue it here - akpm */ |
| 279 | struct work_struct SAK_work; |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 280 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | }; |
| 282 | |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | /* tty magic number */ |
| 291 | #define TTY_MAGIC 0x5401 |
| 292 | |
| 293 | /* |
| 294 | * These bits are used in the flags field of the tty structure. |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 295 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 302 | #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | #define TTY_LDISC 9 /* Line discipline attached */ |
Alan Cox | c9b3976 | 2009-01-02 13:44:56 +0000 | [diff] [blame] | 310 | #define TTY_LDISC_CHANGING 10 /* Line discipline changing */ |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 311 | #define TTY_LDISC_OPEN 11 /* Line discipline is open */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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() */ |
Jiri Slaby | acfa747 | 2010-11-29 10:16:54 +0100 | [diff] [blame] | 317 | #define TTY_HUPPING 21 /* ->hangup() in progress */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) |
| 320 | |
Peter Hurley | 70bc126 | 2013-03-06 08:20:52 -0500 | [diff] [blame] | 321 | /* Values for tty->flow_change */ |
| 322 | #define TTY_THROTTLE_SAFE 1 |
| 323 | #define TTY_UNTHROTTLE_SAFE 2 |
| 324 | |
| 325 | static inline void __tty_set_flow_change(struct tty_struct *tty, int val) |
| 326 | { |
| 327 | tty->flow_change = val; |
| 328 | } |
| 329 | |
| 330 | static inline void tty_set_flow_change(struct tty_struct *tty, int val) |
| 331 | { |
| 332 | tty->flow_change = val; |
| 333 | smp_mb(); |
| 334 | } |
| 335 | |
Joe Millenbach | 4f73bc4 | 2013-01-17 22:44:22 -0800 | [diff] [blame] | 336 | #ifdef CONFIG_TTY |
| 337 | extern void console_init(void); |
| 338 | extern void tty_kref_put(struct tty_struct *tty); |
| 339 | extern struct pid *tty_get_pgrp(struct tty_struct *tty); |
| 340 | extern void tty_vhangup_self(void); |
| 341 | extern void disassociate_ctty(int priv); |
| 342 | extern dev_t tty_devnum(struct tty_struct *tty); |
| 343 | extern void proc_clear_tty(struct task_struct *p); |
| 344 | extern struct tty_struct *get_current_tty(void); |
| 345 | /* tty_io.c */ |
| 346 | extern int __init tty_init(void); |
| 347 | #else |
| 348 | static inline void console_init(void) |
| 349 | { } |
| 350 | static inline void tty_kref_put(struct tty_struct *tty) |
| 351 | { } |
| 352 | static inline struct pid *tty_get_pgrp(struct tty_struct *tty) |
| 353 | { return NULL; } |
| 354 | static inline void tty_vhangup_self(void) |
| 355 | { } |
| 356 | static inline void disassociate_ctty(int priv) |
| 357 | { } |
| 358 | static inline dev_t tty_devnum(struct tty_struct *tty) |
| 359 | { return 0; } |
| 360 | static inline void proc_clear_tty(struct task_struct *p) |
| 361 | { } |
| 362 | static inline struct tty_struct *get_current_tty(void) |
| 363 | { return NULL; } |
| 364 | /* tty_io.c */ |
| 365 | static inline int __init tty_init(void) |
| 366 | { return 0; } |
| 367 | #endif |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | extern void tty_write_flush(struct tty_struct *); |
| 370 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 371 | extern struct ktermios tty_std_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | extern int vcs_init(void); |
| 374 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 375 | extern struct class *tty_class; |
| 376 | |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 377 | /** |
| 378 | * tty_kref_get - get a tty reference |
| 379 | * @tty: tty device |
| 380 | * |
| 381 | * Return a new reference to a tty object. The caller must hold |
| 382 | * sufficient locks/counts to ensure that their existing reference cannot |
| 383 | * go away |
| 384 | */ |
| 385 | |
Ingo Molnar | 14bfc98 | 2008-11-25 08:58:11 +0100 | [diff] [blame] | 386 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 387 | { |
| 388 | if (tty) |
| 389 | kref_get(&tty->kref); |
| 390 | return tty; |
| 391 | } |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, |
| 394 | const char *routine); |
| 395 | extern char *tty_name(struct tty_struct *tty, char *buf); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 396 | extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
| 397 | extern int tty_check_change(struct tty_struct *tty); |
| 398 | extern void stop_tty(struct tty_struct *tty); |
| 399 | extern void start_tty(struct tty_struct *tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | extern int tty_register_driver(struct tty_driver *driver); |
| 401 | extern int tty_unregister_driver(struct tty_driver *driver); |
Greg Kroah-Hartman | 01107d3 | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 402 | extern struct device *tty_register_device(struct tty_driver *driver, |
| 403 | unsigned index, struct device *dev); |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 404 | extern struct device *tty_register_device_attr(struct tty_driver *driver, |
| 405 | unsigned index, struct device *device, |
| 406 | void *drvdata, |
| 407 | const struct attribute_group **attr_grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
| 409 | extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, |
| 410 | int buflen); |
| 411 | extern void tty_write_message(struct tty_struct *tty, char *msg); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 412 | extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
| 413 | extern int tty_chars_in_buffer(struct tty_struct *tty); |
| 414 | extern int tty_write_room(struct tty_struct *tty); |
| 415 | extern void tty_driver_flush_buffer(struct tty_struct *tty); |
Alan Cox | 39c2e60 | 2008-04-30 00:54:18 -0700 | [diff] [blame] | 416 | extern void tty_throttle(struct tty_struct *tty); |
| 417 | extern void tty_unthrottle(struct tty_struct *tty); |
Peter Hurley | 70bc126 | 2013-03-06 08:20:52 -0500 | [diff] [blame] | 418 | extern int tty_throttle_safe(struct tty_struct *tty); |
| 419 | extern int tty_unthrottle_safe(struct tty_struct *tty); |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 420 | extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
Jiri Slaby | 24d406a | 2011-08-10 14:59:28 +0200 | [diff] [blame] | 421 | extern void tty_driver_remove_tty(struct tty_driver *driver, |
| 422 | struct tty_struct *tty); |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 423 | extern void tty_free_termios(struct tty_struct *tty); |
Eric W. Biederman | 3e7cd6c | 2007-02-12 00:52:58 -0800 | [diff] [blame] | 424 | extern int is_current_pgrp_orphaned(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | extern int is_ignored(int sig); |
| 426 | extern int tty_signal(int sig, struct tty_struct *tty); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 427 | extern void tty_hangup(struct tty_struct *tty); |
| 428 | extern void tty_vhangup(struct tty_struct *tty); |
Arnd Bergmann | ddcd9fb | 2010-06-01 22:53:08 +0200 | [diff] [blame] | 429 | extern void tty_vhangup_locked(struct tty_struct *tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | extern void tty_unhangup(struct file *filp); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 431 | extern int tty_hung_up_p(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | extern void do_SAK(struct tty_struct *tty); |
Eric W. Biederman | 8b6312f | 2007-02-10 01:44:34 -0800 | [diff] [blame] | 433 | extern void __do_SAK(struct tty_struct *tty); |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 434 | extern void no_tty(void); |
OGAWA Hirofumi | e043e42 | 2009-07-29 12:15:56 -0700 | [diff] [blame] | 435 | extern void tty_flush_to_ldisc(struct tty_struct *tty); |
Jiri Slaby | ecbbfd4 | 2012-10-18 22:26:47 +0200 | [diff] [blame] | 436 | extern void tty_buffer_free_all(struct tty_port *port); |
Alan Cox | e049573 | 2008-10-13 10:36:58 +0100 | [diff] [blame] | 437 | extern void tty_buffer_flush(struct tty_struct *tty); |
Jiri Slaby | ecbbfd4 | 2012-10-18 22:26:47 +0200 | [diff] [blame] | 438 | extern void tty_buffer_init(struct tty_port *port); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 439 | extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
| 440 | extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 441 | extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
| 442 | speed_t ibaud, speed_t obaud); |
| 443 | extern void tty_encode_baud_rate(struct tty_struct *tty, |
| 444 | speed_t ibaud, speed_t obaud); |
Jiri Slaby | 6865ff2 | 2013-03-07 13:12:27 +0100 | [diff] [blame] | 445 | |
| 446 | /** |
| 447 | * tty_get_baud_rate - get tty bit rates |
| 448 | * @tty: tty to query |
| 449 | * |
| 450 | * Returns the baud rate as an integer for this terminal. The |
| 451 | * termios lock must be held by the caller and the terminal bit |
| 452 | * flags may be updated. |
| 453 | * |
| 454 | * Locking: none |
| 455 | */ |
| 456 | static inline speed_t tty_get_baud_rate(struct tty_struct *tty) |
| 457 | { |
| 458 | return tty_termios_baud_rate(&tty->termios); |
| 459 | } |
| 460 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 461 | extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
Alan Cox | bf5e583 | 2008-01-08 14:55:51 +0000 | [diff] [blame] | 462 | extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); |
Alan Cox | 8d075b1 | 2011-02-14 16:27:53 +0000 | [diff] [blame] | 463 | extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); |
| 466 | extern void tty_ldisc_deref(struct tty_ldisc *); |
| 467 | extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 468 | extern void tty_ldisc_hangup(struct tty_struct *tty); |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 469 | extern const struct file_operations tty_ldiscs_proc_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | extern void tty_wakeup(struct tty_struct *tty); |
| 472 | extern void tty_ldisc_flush(struct tty_struct *tty); |
| 473 | |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 474 | extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 475 | extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
| 476 | unsigned int cmd, unsigned long arg); |
| 477 | extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 478 | extern void tty_default_fops(struct file_operations *fops); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 479 | extern struct tty_struct *alloc_tty_struct(void); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 480 | extern int tty_alloc_file(struct file *file); |
| 481 | extern void tty_add_file(struct tty_struct *tty, struct file *file); |
| 482 | extern void tty_free_file(struct file *file); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 483 | extern void free_tty_struct(struct tty_struct *tty); |
| 484 | extern void initialize_tty_struct(struct tty_struct *tty, |
| 485 | struct tty_driver *driver, int idx); |
Jiri Slaby | 6716671 | 2011-03-23 10:48:35 +0100 | [diff] [blame] | 486 | extern void deinitialize_tty_struct(struct tty_struct *tty); |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 487 | extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); |
Alan Cox | eeb89d9 | 2009-11-30 13:18:29 +0000 | [diff] [blame] | 488 | extern int tty_release(struct inode *inode, struct file *filp); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 489 | extern int tty_init_termios(struct tty_struct *tty); |
Jiri Slaby | 66d450e | 2012-01-30 21:14:28 +0100 | [diff] [blame] | 490 | extern int tty_standard_install(struct tty_driver *driver, |
| 491 | struct tty_struct *tty); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 492 | |
Alan Cox | e8b70e7 | 2009-06-11 12:48:02 +0100 | [diff] [blame] | 493 | extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); |
| 494 | extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); |
| 495 | |
Ingo Molnar | 70522e1 | 2006-03-23 03:00:31 -0800 | [diff] [blame] | 496 | extern struct mutex tty_mutex; |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 497 | extern spinlock_t tty_files_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 499 | extern void tty_write_unlock(struct tty_struct *tty); |
| 500 | extern int tty_write_lock(struct tty_struct *tty, int ndelay); |
| 501 | #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
| 502 | |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 503 | extern void tty_port_init(struct tty_port *port); |
Jiri Slaby | 2cb4ca0 | 2012-08-07 21:47:50 +0200 | [diff] [blame] | 504 | extern void tty_port_link_device(struct tty_port *port, |
| 505 | struct tty_driver *driver, unsigned index); |
Jiri Slaby | 057eb85 | 2012-06-04 13:35:37 +0200 | [diff] [blame] | 506 | extern struct device *tty_port_register_device(struct tty_port *port, |
| 507 | struct tty_driver *driver, unsigned index, |
| 508 | struct device *device); |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 509 | extern struct device *tty_port_register_device_attr(struct tty_port *port, |
| 510 | struct tty_driver *driver, unsigned index, |
| 511 | struct device *device, void *drvdata, |
| 512 | const struct attribute_group **attr_grp); |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 513 | extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
| 514 | extern void tty_port_free_xmit_buf(struct tty_port *port); |
Jiri Slaby | de274bf | 2012-11-15 09:49:54 +0100 | [diff] [blame] | 515 | extern void tty_port_destroy(struct tty_port *port); |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 516 | extern void tty_port_put(struct tty_port *port); |
| 517 | |
Randy Dunlap | 2427b8e | 2010-01-15 17:01:11 -0800 | [diff] [blame] | 518 | static inline struct tty_port *tty_port_get(struct tty_port *port) |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 519 | { |
| 520 | if (port) |
| 521 | kref_get(&port->kref); |
| 522 | return port; |
| 523 | } |
| 524 | |
Huang Shijie | f21ec3d | 2012-08-22 22:13:36 -0400 | [diff] [blame] | 525 | /* If the cts flow control is enabled, return true. */ |
| 526 | static inline bool tty_port_cts_enabled(struct tty_port *port) |
| 527 | { |
| 528 | return port->flags & ASYNC_CTS_FLOW; |
| 529 | } |
| 530 | |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 531 | extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
| 532 | extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 533 | extern int tty_port_carrier_raised(struct tty_port *port); |
Alan Cox | 5d951fb | 2009-01-02 13:45:19 +0000 | [diff] [blame] | 534 | extern void tty_port_raise_dtr_rts(struct tty_port *port); |
Alan Cox | fcc8ac1 | 2009-06-11 12:24:17 +0100 | [diff] [blame] | 535 | extern void tty_port_lower_dtr_rts(struct tty_port *port); |
Alan Cox | 3e61696 | 2009-01-02 13:45:26 +0000 | [diff] [blame] | 536 | extern void tty_port_hangup(struct tty_port *port); |
Jiri Slaby | 6aad04f | 2013-03-07 13:12:29 +0100 | [diff] [blame^] | 537 | extern void tty_port_tty_wakeup(struct tty_port *port); |
Alan Cox | 36c621d | 2009-01-02 13:46:10 +0000 | [diff] [blame] | 538 | extern int tty_port_block_til_ready(struct tty_port *port, |
| 539 | struct tty_struct *tty, struct file *filp); |
Alan Cox | a661499 | 2009-01-02 13:46:50 +0000 | [diff] [blame] | 540 | extern int tty_port_close_start(struct tty_port *port, |
| 541 | struct tty_struct *tty, struct file *filp); |
| 542 | extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 543 | extern void tty_port_close(struct tty_port *port, |
| 544 | struct tty_struct *tty, struct file *filp); |
Jiri Slaby | 695586c | 2012-06-04 13:35:32 +0200 | [diff] [blame] | 545 | extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
| 546 | struct tty_struct *tty); |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 547 | extern int tty_port_open(struct tty_port *port, |
| 548 | struct tty_struct *tty, struct file *filp); |
Randy Dunlap | 2427b8e | 2010-01-15 17:01:11 -0800 | [diff] [blame] | 549 | static inline int tty_port_users(struct tty_port *port) |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 550 | { |
| 551 | return port->count + port->blocked_open; |
| 552 | } |
| 553 | |
Alan Cox | 01e1abb | 2008-07-22 11:16:55 +0100 | [diff] [blame] | 554 | extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
| 555 | extern int tty_unregister_ldisc(int disc); |
| 556 | extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); |
| 557 | extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
| 558 | extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); |
| 559 | extern void tty_ldisc_init(struct tty_struct *tty); |
Jiri Slaby | 6716671 | 2011-03-23 10:48:35 +0100 | [diff] [blame] | 560 | extern void tty_ldisc_deinit(struct tty_struct *tty); |
Alan Cox | 01e1abb | 2008-07-22 11:16:55 +0100 | [diff] [blame] | 561 | extern void tty_ldisc_begin(void); |
| 562 | /* This last one is just for the tty layer internals and shouldn't be used elsewhere */ |
| 563 | extern void tty_ldisc_enable(struct tty_struct *tty); |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 564 | |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | /* n_tty.c */ |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 567 | extern struct tty_ldisc_ops tty_ldisc_N_TTY; |
Rodolfo Giometti | 572b9ad | 2010-03-10 15:23:46 -0800 | [diff] [blame] | 568 | extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 570 | /* tty_audit.c */ |
| 571 | #ifdef CONFIG_AUDIT |
| 572 | extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, |
Jiri Slaby | 6c633f2 | 2012-10-18 22:26:37 +0200 | [diff] [blame] | 573 | size_t size, unsigned icanon); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 574 | extern void tty_audit_exit(void); |
| 575 | extern void tty_audit_fork(struct signal_struct *sig); |
Al Viro | 1e64174 | 2008-12-09 09:23:33 +0000 | [diff] [blame] | 576 | extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 577 | extern void tty_audit_push(struct tty_struct *tty); |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 578 | extern int tty_audit_push_task(struct task_struct *tsk, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 579 | kuid_t loginuid, u32 sessionid); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 580 | #else |
| 581 | static inline void tty_audit_add_data(struct tty_struct *tty, |
Jiri Slaby | 6c633f2 | 2012-10-18 22:26:37 +0200 | [diff] [blame] | 582 | unsigned char *data, size_t size, unsigned icanon) |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 583 | { |
| 584 | } |
Al Viro | 1e64174 | 2008-12-09 09:23:33 +0000 | [diff] [blame] | 585 | static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
| 586 | { |
| 587 | } |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 588 | static inline void tty_audit_exit(void) |
| 589 | { |
| 590 | } |
| 591 | static inline void tty_audit_fork(struct signal_struct *sig) |
| 592 | { |
| 593 | } |
| 594 | static inline void tty_audit_push(struct tty_struct *tty) |
| 595 | { |
| 596 | } |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 597 | static inline int tty_audit_push_task(struct task_struct *tsk, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 598 | kuid_t loginuid, u32 sessionid) |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 599 | { |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 600 | return 0; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 601 | } |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 602 | #endif |
| 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | /* tty_ioctl.c */ |
Alan Cox | 47afa7a | 2008-10-13 10:44:17 +0100 | [diff] [blame] | 605 | extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | unsigned int cmd, unsigned long arg); |
Thomas Meyer | 8193c42 | 2011-10-05 23:13:13 +0200 | [diff] [blame] | 607 | extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, |
| 608 | unsigned int cmd, unsigned long arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | /* serial.c */ |
| 611 | |
| 612 | extern void serial_console_init(void); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* pcxx.c */ |
| 615 | |
| 616 | extern int pcxe_open(struct tty_struct *tty, struct file *filp); |
| 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* vt.c */ |
| 619 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 620 | extern int vt_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | unsigned int cmd, unsigned long arg); |
| 622 | |
Greg Kroah-Hartman | 94c2273 | 2011-02-17 12:02:51 -0800 | [diff] [blame] | 623 | extern long vt_compat_ioctl(struct tty_struct *tty, |
Arnd Bergmann | e921665 | 2009-08-06 15:09:28 +0200 | [diff] [blame] | 624 | unsigned int cmd, unsigned long arg); |
| 625 | |
Arnd Bergmann | b07471f | 2010-08-06 21:40:30 +0200 | [diff] [blame] | 626 | /* tty_mutex.c */ |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 627 | /* functions for preparation of BKL removal */ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 628 | extern void __lockfunc tty_lock(struct tty_struct *tty); |
| 629 | extern void __lockfunc tty_unlock(struct tty_struct *tty); |
| 630 | extern void __lockfunc tty_lock_pair(struct tty_struct *tty, |
| 631 | struct tty_struct *tty2); |
| 632 | extern void __lockfunc tty_unlock_pair(struct tty_struct *tty, |
| 633 | struct tty_struct *tty2); |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 634 | |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 635 | /* |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 636 | * this shall be called only from where BTM is held (like close) |
| 637 | * |
| 638 | * We need this to ensure nobody waits for us to finish while we are waiting. |
| 639 | * Without this we were encountering system stalls. |
| 640 | * |
| 641 | * This should be indeed removed with BTM removal later. |
| 642 | * |
| 643 | * Locking: BTM required. Nobody is allowed to hold port->mutex. |
| 644 | */ |
| 645 | static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, |
| 646 | long timeout) |
| 647 | { |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 648 | tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */ |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 649 | tty_wait_until_sent(tty, timeout); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 650 | tty_lock(tty); |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 651 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 653 | /* |
| 654 | * wait_event_interruptible_tty -- wait for a condition with the tty lock held |
| 655 | * |
| 656 | * The condition we are waiting for might take a long time to |
| 657 | * become true, or might depend on another thread taking the |
| 658 | * BTM. In either case, we need to drop the BTM to guarantee |
| 659 | * forward progress. This is a leftover from the conversion |
| 660 | * from the BKL and should eventually get removed as the BTM |
| 661 | * falls out of use. |
| 662 | * |
| 663 | * Do not use in new code. |
| 664 | */ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 665 | #define wait_event_interruptible_tty(tty, wq, condition) \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 666 | ({ \ |
| 667 | int __ret = 0; \ |
| 668 | if (!(condition)) { \ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 669 | __wait_event_interruptible_tty(tty, wq, condition, __ret); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 670 | } \ |
| 671 | __ret; \ |
| 672 | }) |
| 673 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 674 | #define __wait_event_interruptible_tty(tty, wq, condition, ret) \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 675 | do { \ |
| 676 | DEFINE_WAIT(__wait); \ |
| 677 | \ |
| 678 | for (;;) { \ |
| 679 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
| 680 | if (condition) \ |
| 681 | break; \ |
| 682 | if (!signal_pending(current)) { \ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 683 | tty_unlock(tty); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 684 | schedule(); \ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 685 | tty_lock(tty); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 686 | continue; \ |
| 687 | } \ |
| 688 | ret = -ERESTARTSYS; \ |
| 689 | break; \ |
| 690 | } \ |
| 691 | finish_wait(&wq, &__wait); \ |
| 692 | } while (0) |
| 693 | |
| 694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | #endif |