Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_TTY_H |
| 2 | #define _LINUX_TTY_H |
| 3 | |
| 4 | /* |
| 5 | * 'tty.h' defines some structures used by tty_io.c and some defines. |
| 6 | */ |
| 7 | |
Pavan Savoy | 1ff454e | 2010-04-08 13:16:52 -0500 | [diff] [blame] | 8 | #define NR_LDISCS 30 |
Tilman Schmidt | 4564f9e | 2007-02-10 01:45:00 -0800 | [diff] [blame] | 9 | |
| 10 | /* line disciplines */ |
| 11 | #define N_TTY 0 |
| 12 | #define N_SLIP 1 |
| 13 | #define N_MOUSE 2 |
| 14 | #define N_PPP 3 |
| 15 | #define N_STRIP 4 |
| 16 | #define N_AX25 5 |
| 17 | #define N_X25 6 /* X.25 async */ |
| 18 | #define N_6PACK 7 |
| 19 | #define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */ |
| 20 | #define N_R3964 9 /* Reserved for Simatic R3964 module */ |
David Woodhouse | 44d1b98 | 2008-06-05 22:46:18 -0700 | [diff] [blame] | 21 | #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */ |
Tilman Schmidt | 4564f9e | 2007-02-10 01:45:00 -0800 | [diff] [blame] | 22 | #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */ |
| 23 | #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */ |
| 24 | /* cards about SMS messages */ |
| 25 | #define N_HDLC 13 /* synchronous HDLC */ |
| 26 | #define N_SYNC_PPP 14 /* synchronous PPP */ |
| 27 | #define N_HCI 15 /* Bluetooth HCI UART */ |
| 28 | #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */ |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 29 | #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */ |
Alan Cox | 348eb12 | 2008-10-13 10:37:17 +0100 | [diff] [blame] | 30 | #define N_PPS 18 /* Pulse per Second */ |
Janusz Krzysztofik | b7b8f9b | 2009-08-06 13:07:32 +0200 | [diff] [blame] | 31 | #define N_V253 19 /* Codec control over voice modem */ |
Sjur Braendeland | 9b27105 | 2010-03-30 13:56:30 +0000 | [diff] [blame] | 32 | #define N_CAIF 20 /* CAIF protocol for talking to modems */ |
Alan Cox | e1eaea4 | 2010-03-26 11:32:54 +0000 | [diff] [blame] | 33 | #define N_GSM0710 21 /* GSM 0710 Mux */ |
Alan Cox | 65f8e44 | 2010-11-09 10:48:25 +0000 | [diff] [blame] | 34 | #define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */ |
J Freyensee | ee4f6b4 | 2011-05-06 16:56:50 -0700 | [diff] [blame] | 35 | #define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */ |
| 36 | #define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */ |
Janusz Krzysztofik | 78ed73e | 2009-07-22 05:22:37 +0200 | [diff] [blame] | 37 | |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 38 | #ifdef __KERNEL__ |
| 39 | #include <linux/fs.h> |
| 40 | #include <linux/major.h> |
| 41 | #include <linux/termios.h> |
| 42 | #include <linux/workqueue.h> |
| 43 | #include <linux/tty_driver.h> |
| 44 | #include <linux/tty_ldisc.h> |
| 45 | #include <linux/mutex.h> |
| 46 | |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 47 | |
| 48 | |
| 49 | /* |
| 50 | * (Note: the *_driver.minor_start values 1, 64, 128, 192 are |
| 51 | * hardcoded at present.) |
| 52 | */ |
| 53 | #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ |
Konstantin Khlebnikov | e9aba51 | 2012-01-05 13:06:11 +0400 | [diff] [blame] | 54 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
Florian Fainelli | ae92c1f | 2011-05-24 10:43:03 +0200 | [diff] [blame] | 55 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * This character is the same as _POSIX_VDISABLE: it cannot be used as |
| 59 | * a c_cc[] character, but indicates that a particular special character |
| 60 | * isn't in use (eg VINTR has no character etc) |
| 61 | */ |
| 62 | #define __DISABLED_CHAR '\0' |
| 63 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 64 | struct tty_buffer { |
| 65 | struct tty_buffer *next; |
| 66 | char *char_buf_ptr; |
| 67 | unsigned char *flag_buf_ptr; |
| 68 | int used; |
| 69 | int size; |
Paul Fulghum | 8977d92 | 2006-02-10 01:51:14 -0800 | [diff] [blame] | 70 | int commit; |
| 71 | int read; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 72 | /* Data points here */ |
| 73 | unsigned long data[0]; |
| 74 | }; |
| 75 | |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 76 | /* |
| 77 | * We default to dicing tty buffer allocations to this many characters |
Mel Gorman | 352fa6a | 2010-03-02 22:24:19 +0000 | [diff] [blame] | 78 | * in order to avoid multiple page allocations. We know the size of |
| 79 | * tty_buffer itself but it must also be taken into account that the |
| 80 | * the buffer is 256 byte aligned. See tty_buffer_find for the allocation |
| 81 | * logic this must match |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 82 | */ |
| 83 | |
Mel Gorman | 352fa6a | 2010-03-02 22:24:19 +0000 | [diff] [blame] | 84 | #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF) |
Alan Cox | d9661ad | 2010-02-18 16:43:47 +0000 | [diff] [blame] | 85 | |
| 86 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 87 | struct tty_bufhead { |
Linus Torvalds | f23eb2b | 2011-03-22 16:17:32 -0700 | [diff] [blame] | 88 | struct work_struct work; |
Paul Fulghum | 808249c | 2006-02-03 03:04:41 -0800 | [diff] [blame] | 89 | spinlock_t lock; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 90 | struct tty_buffer *head; /* Queue head */ |
| 91 | struct tty_buffer *tail; /* Active buffer */ |
| 92 | struct tty_buffer *free; /* Free queue head */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 93 | int memory_used; /* Buffer space used excluding |
| 94 | free queue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | }; |
| 96 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | * When a break, frame error, or parity error happens, these codes are |
| 98 | * stuffed into the flags buffer. |
| 99 | */ |
| 100 | #define TTY_NORMAL 0 |
| 101 | #define TTY_BREAK 1 |
| 102 | #define TTY_FRAME 2 |
| 103 | #define TTY_PARITY 3 |
| 104 | #define TTY_OVERRUN 4 |
| 105 | |
| 106 | #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR]) |
| 107 | #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT]) |
| 108 | #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE]) |
| 109 | #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL]) |
| 110 | #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF]) |
| 111 | #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME]) |
| 112 | #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN]) |
| 113 | #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC]) |
| 114 | #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART]) |
| 115 | #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP]) |
| 116 | #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP]) |
| 117 | #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL]) |
| 118 | #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT]) |
| 119 | #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD]) |
| 120 | #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE]) |
| 121 | #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT]) |
| 122 | #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2]) |
| 123 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 124 | #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f)) |
| 125 | #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f)) |
| 126 | #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f)) |
| 127 | #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 129 | #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) |
| 130 | #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) |
| 131 | #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) |
| 132 | #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) |
| 133 | #define I_INPCK(tty) _I_FLAG((tty), INPCK) |
| 134 | #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) |
| 135 | #define I_INLCR(tty) _I_FLAG((tty), INLCR) |
| 136 | #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) |
| 137 | #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) |
| 138 | #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) |
| 139 | #define I_IXON(tty) _I_FLAG((tty), IXON) |
| 140 | #define I_IXANY(tty) _I_FLAG((tty), IXANY) |
| 141 | #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) |
| 142 | #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) |
| 143 | #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 145 | #define O_OPOST(tty) _O_FLAG((tty), OPOST) |
| 146 | #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) |
| 147 | #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) |
| 148 | #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) |
| 149 | #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) |
| 150 | #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) |
| 151 | #define O_OFILL(tty) _O_FLAG((tty), OFILL) |
| 152 | #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) |
| 153 | #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) |
| 154 | #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) |
| 155 | #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) |
| 156 | #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) |
| 157 | #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) |
| 158 | #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 160 | #define C_BAUD(tty) _C_FLAG((tty), CBAUD) |
| 161 | #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) |
| 162 | #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) |
| 163 | #define C_CREAD(tty) _C_FLAG((tty), CREAD) |
| 164 | #define C_PARENB(tty) _C_FLAG((tty), PARENB) |
| 165 | #define C_PARODD(tty) _C_FLAG((tty), PARODD) |
| 166 | #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) |
| 167 | #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) |
| 168 | #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) |
| 169 | #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 171 | #define L_ISIG(tty) _L_FLAG((tty), ISIG) |
| 172 | #define L_ICANON(tty) _L_FLAG((tty), ICANON) |
| 173 | #define L_XCASE(tty) _L_FLAG((tty), XCASE) |
| 174 | #define L_ECHO(tty) _L_FLAG((tty), ECHO) |
| 175 | #define L_ECHOE(tty) _L_FLAG((tty), ECHOE) |
| 176 | #define L_ECHOK(tty) _L_FLAG((tty), ECHOK) |
| 177 | #define L_ECHONL(tty) _L_FLAG((tty), ECHONL) |
| 178 | #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) |
| 179 | #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) |
| 180 | #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) |
| 181 | #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) |
| 182 | #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) |
| 183 | #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) |
| 184 | #define L_PENDIN(tty) _L_FLAG((tty), PENDIN) |
| 185 | #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 186 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | struct device; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 189 | struct signal_struct; |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 190 | |
| 191 | /* |
| 192 | * Port level information. Each device keeps its own port level information |
| 193 | * so provide a common structure for those ports wanting to use common support |
| 194 | * routines. |
| 195 | * |
| 196 | * The tty port has a different lifetime to the tty so must be kept apart. |
| 197 | * In addition be careful as tty -> port mappings are valid for the life |
| 198 | * of the tty object but in many cases port -> tty mappings are valid only |
| 199 | * until a hangup so don't use the wrong path. |
| 200 | */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 201 | |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 202 | struct tty_port; |
| 203 | |
| 204 | struct tty_port_operations { |
| 205 | /* Return 1 if the carrier is raised */ |
| 206 | int (*carrier_raised)(struct tty_port *port); |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 207 | /* Control the DTR line */ |
Alan Cox | fcc8ac1 | 2009-06-11 12:24:17 +0100 | [diff] [blame] | 208 | void (*dtr_rts)(struct tty_port *port, int raise); |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 209 | /* Called when the last close completes or a hangup finishes |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 210 | IFF the port was initialized. Do not use to free resources. Called |
| 211 | under the port mutex to serialize against activate/shutdowns */ |
Alan Cox | 7ca0ff9 | 2009-09-19 13:13:20 -0700 | [diff] [blame] | 212 | void (*shutdown)(struct tty_port *port); |
| 213 | void (*drop)(struct tty_port *port); |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 214 | /* Called under the port mutex from tty_port_open, serialized using |
| 215 | the port mutex */ |
| 216 | /* FIXME: long term getting the tty argument *out* of this would be |
| 217 | good for consoles */ |
| 218 | int (*activate)(struct tty_port *port, struct tty_struct *tty); |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 219 | /* Called on the final put of a port */ |
| 220 | void (*destruct)(struct tty_port *port); |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 221 | }; |
| 222 | |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 223 | struct tty_port { |
| 224 | struct tty_struct *tty; /* Back pointer */ |
Alan Cox | 31f3593 | 2009-01-02 13:45:05 +0000 | [diff] [blame] | 225 | const struct tty_port_operations *ops; /* Port operations */ |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 226 | spinlock_t lock; /* Lock protecting tty field */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 227 | int blocked_open; /* Waiting to open */ |
| 228 | int count; /* Usage count */ |
| 229 | wait_queue_head_t open_wait; /* Open waiters */ |
| 230 | wait_queue_head_t close_wait; /* Close waiters */ |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 231 | wait_queue_head_t delta_msr_wait; /* Modem status change */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 232 | unsigned long flags; /* TTY flags ASY_*/ |
Jason Wessel | 336cee4 | 2010-03-08 21:50:11 -0600 | [diff] [blame] | 233 | unsigned char console:1; /* port is a console */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 234 | struct mutex mutex; /* Locking */ |
Alan Cox | 44e4909 | 2009-11-30 13:16:41 +0000 | [diff] [blame] | 235 | struct mutex buf_mutex; /* Buffer alloc lock */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 236 | unsigned char *xmit_buf; /* Optional buffer */ |
Alan Cox | 5e99df5 | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 237 | unsigned int close_delay; /* Close port delay */ |
| 238 | unsigned int closing_wait; /* Delay for output */ |
Alan Cox | 1ec739b | 2009-06-11 12:25:25 +0100 | [diff] [blame] | 239 | int drain_delay; /* Set to zero if no pure time |
| 240 | based drain is needed else |
| 241 | set to size of fifo */ |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 242 | struct kref kref; /* Ref counter */ |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 243 | }; |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /* |
| 246 | * Where all of the state associated with a tty is kept while the tty |
| 247 | * is open. Since the termios state should be kept even if the tty |
| 248 | * has been closed --- for things like the baud rate, etc --- it is |
| 249 | * not stored here, but rather a pointer to the real state is stored |
| 250 | * here. Possible the winsize structure should have the same |
| 251 | * treatment, but (1) the default 80x24 is usually right and (2) it's |
| 252 | * most often used by a windowing system, which will set the correct |
| 253 | * size each time the window is created or resized anyway. |
| 254 | * - TYT, 9/14/92 |
| 255 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 256 | |
| 257 | struct tty_operations; |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | struct tty_struct { |
| 260 | int magic; |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 261 | struct kref kref; |
Dmitry Eremin-Solenikov | 30004ac | 2010-08-09 18:22:49 +0400 | [diff] [blame] | 262 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | struct tty_driver *driver; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 264 | const struct tty_operations *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | int index; |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 266 | |
| 267 | /* Protects ldisc changes: Lock tty not pty */ |
| 268 | struct mutex ldisc_mutex; |
| 269 | struct tty_ldisc *ldisc; |
| 270 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 271 | struct mutex termios_mutex; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 272 | spinlock_t ctrl_lock; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 273 | /* Termios values are protected by the termios mutex */ |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 274 | struct ktermios *termios, *termios_locked; |
Alan Cox | 1d65b4a | 2008-10-13 10:38:18 +0100 | [diff] [blame] | 275 | struct termiox *termiox; /* May be NULL for unsupported */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | char name[64]; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 277 | struct pid *pgrp; /* Protected by ctrl lock */ |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 278 | struct pid *session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | unsigned long flags; |
| 280 | int count; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 281 | struct winsize winsize; /* termios mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; |
| 283 | unsigned char low_latency:1, warned:1; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 284 | unsigned char ctrl_status; /* ctrl_lock */ |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 285 | unsigned int receive_room; /* Bytes free for queue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | struct tty_struct *link; |
| 288 | struct fasync_struct *fasync; |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 289 | struct tty_bufhead buf; /* Locked internally */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | int alt_speed; /* For magic substitution of 38400 bps */ |
| 291 | wait_queue_head_t write_wait; |
| 292 | wait_queue_head_t read_wait; |
| 293 | struct work_struct hangup_work; |
| 294 | void *disc_data; |
| 295 | void *driver_data; |
| 296 | struct list_head tty_files; |
| 297 | |
| 298 | #define N_TTY_BUF_SIZE 4096 |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* |
| 301 | * The following is data for the N_TTY line discipline. For |
| 302 | * historical reasons, this is included in the tty structure. |
Alan Cox | 47f8683 | 2008-04-30 00:53:30 -0700 | [diff] [blame] | 303 | * Mostly locked by the BKL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | */ |
| 305 | unsigned int column; |
| 306 | unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; |
| 307 | unsigned char closing:1; |
Joe Peterson | a88a69c | 2009-01-02 13:40:53 +0000 | [diff] [blame] | 308 | unsigned char echo_overrun:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | unsigned short minimum_to_wake; |
| 310 | unsigned long overrun_time; |
| 311 | int num_overrun; |
| 312 | unsigned long process_char_map[256/(8*sizeof(unsigned long))]; |
| 313 | char *read_buf; |
| 314 | int read_head; |
| 315 | int read_tail; |
| 316 | int read_cnt; |
| 317 | unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))]; |
Joe Peterson | a88a69c | 2009-01-02 13:40:53 +0000 | [diff] [blame] | 318 | unsigned char *echo_buf; |
| 319 | unsigned int echo_pos; |
| 320 | unsigned int echo_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | int canon_data; |
| 322 | unsigned long canon_head; |
| 323 | unsigned int canon_column; |
Ingo Molnar | 70522e1 | 2006-03-23 03:00:31 -0800 | [diff] [blame] | 324 | struct mutex atomic_read_lock; |
| 325 | struct mutex atomic_write_lock; |
Joe Peterson | a88a69c | 2009-01-02 13:40:53 +0000 | [diff] [blame] | 326 | struct mutex output_lock; |
| 327 | struct mutex echo_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | unsigned char *write_buf; |
| 329 | int write_cnt; |
| 330 | spinlock_t read_lock; |
| 331 | /* If the tty has a pending do_SAK, queue it here - akpm */ |
| 332 | struct work_struct SAK_work; |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 333 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | }; |
| 335 | |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 336 | /* Each of a tty's open files has private_data pointing to tty_file_private */ |
| 337 | struct tty_file_private { |
| 338 | struct tty_struct *tty; |
| 339 | struct file *file; |
| 340 | struct list_head list; |
| 341 | }; |
| 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | /* tty magic number */ |
| 344 | #define TTY_MAGIC 0x5401 |
| 345 | |
| 346 | /* |
| 347 | * These bits are used in the flags field of the tty structure. |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 348 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | * So that interrupts won't be able to mess up the queues, |
| 350 | * copy_to_cooked must be atomic with respect to itself, as must |
| 351 | * tty->write. Thus, you must use the inline functions set_bit() and |
| 352 | * clear_bit() to make things atomic. |
| 353 | */ |
| 354 | #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 355 | #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] | 356 | #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ |
| 357 | #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ |
| 358 | #define TTY_DEBUG 4 /* Debugging */ |
| 359 | #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ |
| 360 | #define TTY_PUSH 6 /* n_tty private */ |
| 361 | #define TTY_CLOSING 7 /* ->close() in progress */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | #define TTY_LDISC 9 /* Line discipline attached */ |
Alan Cox | c9b3976 | 2009-01-02 13:44:56 +0000 | [diff] [blame] | 363 | #define TTY_LDISC_CHANGING 10 /* Line discipline changing */ |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 364 | #define TTY_LDISC_OPEN 11 /* Line discipline is open */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ |
| 366 | #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ |
| 367 | #define TTY_PTY_LOCK 16 /* pty private */ |
| 368 | #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ |
| 369 | #define TTY_HUPPED 18 /* Post driver->hangup() */ |
Alan Cox | 42fd552 | 2007-08-10 13:01:05 -0700 | [diff] [blame] | 370 | #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ |
| 371 | #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ |
Jiri Slaby | acfa747 | 2010-11-29 10:16:54 +0100 | [diff] [blame] | 372 | #define TTY_HUPPING 21 /* ->hangup() in progress */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) |
| 375 | |
| 376 | extern void tty_write_flush(struct tty_struct *); |
| 377 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 378 | extern struct ktermios tty_std_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | extern void console_init(void); |
| 381 | extern int vcs_init(void); |
| 382 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 383 | extern struct class *tty_class; |
| 384 | |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 385 | /** |
| 386 | * tty_kref_get - get a tty reference |
| 387 | * @tty: tty device |
| 388 | * |
| 389 | * Return a new reference to a tty object. The caller must hold |
| 390 | * sufficient locks/counts to ensure that their existing reference cannot |
| 391 | * go away |
| 392 | */ |
| 393 | |
Ingo Molnar | 14bfc98 | 2008-11-25 08:58:11 +0100 | [diff] [blame] | 394 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 395 | { |
| 396 | if (tty) |
| 397 | kref_get(&tty->kref); |
| 398 | return tty; |
| 399 | } |
| 400 | extern void tty_kref_put(struct tty_struct *tty); |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, |
| 403 | const char *routine); |
| 404 | extern char *tty_name(struct tty_struct *tty, char *buf); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 405 | extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
| 406 | extern int tty_check_change(struct tty_struct *tty); |
| 407 | extern void stop_tty(struct tty_struct *tty); |
| 408 | extern void start_tty(struct tty_struct *tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | extern int tty_register_driver(struct tty_driver *driver); |
| 410 | extern int tty_unregister_driver(struct tty_driver *driver); |
Greg Kroah-Hartman | 01107d3 | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 411 | extern struct device *tty_register_device(struct tty_driver *driver, |
| 412 | unsigned index, struct device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
| 414 | extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, |
| 415 | int buflen); |
| 416 | extern void tty_write_message(struct tty_struct *tty, char *msg); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 417 | extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
| 418 | extern int tty_chars_in_buffer(struct tty_struct *tty); |
| 419 | extern int tty_write_room(struct tty_struct *tty); |
| 420 | extern void tty_driver_flush_buffer(struct tty_struct *tty); |
Alan Cox | 39c2e60 | 2008-04-30 00:54:18 -0700 | [diff] [blame] | 421 | extern void tty_throttle(struct tty_struct *tty); |
| 422 | extern void tty_unthrottle(struct tty_struct *tty); |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 423 | extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
Jiri Slaby | 24d406a | 2011-08-10 14:59:28 +0200 | [diff] [blame] | 424 | extern void tty_driver_remove_tty(struct tty_driver *driver, |
| 425 | struct tty_struct *tty); |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 426 | extern void tty_shutdown(struct tty_struct *tty); |
| 427 | extern void tty_free_termios(struct tty_struct *tty); |
Eric W. Biederman | 3e7cd6c | 2007-02-12 00:52:58 -0800 | [diff] [blame] | 428 | extern int is_current_pgrp_orphaned(void); |
Alan Cox | 5d0fdf1 | 2008-04-30 00:53:31 -0700 | [diff] [blame] | 429 | extern struct pid *tty_get_pgrp(struct tty_struct *tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | extern int is_ignored(int sig); |
| 431 | extern int tty_signal(int sig, struct tty_struct *tty); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 432 | extern void tty_hangup(struct tty_struct *tty); |
| 433 | extern void tty_vhangup(struct tty_struct *tty); |
Arnd Bergmann | ddcd9fb | 2010-06-01 22:53:08 +0200 | [diff] [blame] | 434 | extern void tty_vhangup_locked(struct tty_struct *tty); |
Alan Cox | 2cb5998 | 2008-10-13 10:40:30 +0100 | [diff] [blame] | 435 | extern void tty_vhangup_self(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | extern void tty_unhangup(struct file *filp); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 437 | extern int tty_hung_up_p(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | extern void do_SAK(struct tty_struct *tty); |
Eric W. Biederman | 8b6312f | 2007-02-10 01:44:34 -0800 | [diff] [blame] | 439 | extern void __do_SAK(struct tty_struct *tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | extern void disassociate_ctty(int priv); |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 441 | extern void no_tty(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | extern void tty_flip_buffer_push(struct tty_struct *tty); |
OGAWA Hirofumi | e043e42 | 2009-07-29 12:15:56 -0700 | [diff] [blame] | 443 | extern void tty_flush_to_ldisc(struct tty_struct *tty); |
Alan Cox | e049573 | 2008-10-13 10:36:58 +0100 | [diff] [blame] | 444 | extern void tty_buffer_free_all(struct tty_struct *tty); |
| 445 | extern void tty_buffer_flush(struct tty_struct *tty); |
| 446 | extern void tty_buffer_init(struct tty_struct *tty); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 447 | extern speed_t tty_get_baud_rate(struct tty_struct *tty); |
| 448 | extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
| 449 | extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 450 | extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
| 451 | speed_t ibaud, speed_t obaud); |
| 452 | extern void tty_encode_baud_rate(struct tty_struct *tty, |
| 453 | speed_t ibaud, speed_t obaud); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 454 | extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
Alan Cox | bf5e583 | 2008-01-08 14:55:51 +0000 | [diff] [blame] | 455 | extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); |
Alan Cox | 8d075b1 | 2011-02-14 16:27:53 +0000 | [diff] [blame] | 456 | extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); |
| 459 | extern void tty_ldisc_deref(struct tty_ldisc *); |
| 460 | extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); |
Alan Cox | c65c9bc | 2009-06-11 12:50:12 +0100 | [diff] [blame] | 461 | extern void tty_ldisc_hangup(struct tty_struct *tty); |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 462 | extern const struct file_operations tty_ldiscs_proc_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | extern void tty_wakeup(struct tty_struct *tty); |
| 465 | extern void tty_ldisc_flush(struct tty_struct *tty); |
| 466 | |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 467 | 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] | 468 | extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
| 469 | unsigned int cmd, unsigned long arg); |
| 470 | extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 471 | extern dev_t tty_devnum(struct tty_struct *tty); |
| 472 | extern void proc_clear_tty(struct task_struct *p); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 473 | extern struct tty_struct *get_current_tty(void); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 474 | extern void tty_default_fops(struct file_operations *fops); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 475 | extern struct tty_struct *alloc_tty_struct(void); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 476 | extern int tty_alloc_file(struct file *file); |
| 477 | extern void tty_add_file(struct tty_struct *tty, struct file *file); |
| 478 | extern void tty_free_file(struct file *file); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 479 | extern void free_tty_struct(struct tty_struct *tty); |
| 480 | extern void initialize_tty_struct(struct tty_struct *tty, |
| 481 | struct tty_driver *driver, int idx); |
Jiri Slaby | 6716671 | 2011-03-23 10:48:35 +0100 | [diff] [blame] | 482 | extern void deinitialize_tty_struct(struct tty_struct *tty); |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 483 | 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] | 484 | extern int tty_release(struct inode *inode, struct file *filp); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 485 | extern int tty_init_termios(struct tty_struct *tty); |
Jiri Slaby | 66d450e | 2012-01-30 21:14:28 +0100 | [diff] [blame] | 486 | extern int tty_standard_install(struct tty_driver *driver, |
| 487 | struct tty_struct *tty); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 488 | |
Alan Cox | e8b70e7 | 2009-06-11 12:48:02 +0100 | [diff] [blame] | 489 | extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); |
| 490 | extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); |
| 491 | |
Ingo Molnar | 70522e1 | 2006-03-23 03:00:31 -0800 | [diff] [blame] | 492 | extern struct mutex tty_mutex; |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 493 | extern spinlock_t tty_files_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 495 | extern void tty_write_unlock(struct tty_struct *tty); |
| 496 | extern int tty_write_lock(struct tty_struct *tty, int ndelay); |
| 497 | #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
| 498 | |
Alan Cox | 6f67048 | 2008-07-16 21:53:41 +0100 | [diff] [blame] | 499 | extern void tty_port_init(struct tty_port *port); |
| 500 | extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
| 501 | extern void tty_port_free_xmit_buf(struct tty_port *port); |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 502 | extern void tty_port_put(struct tty_port *port); |
| 503 | |
Randy Dunlap | 2427b8e | 2010-01-15 17:01:11 -0800 | [diff] [blame] | 504 | static inline struct tty_port *tty_port_get(struct tty_port *port) |
Alan Cox | 568aafc | 2009-11-30 13:17:14 +0000 | [diff] [blame] | 505 | { |
| 506 | if (port) |
| 507 | kref_get(&port->kref); |
| 508 | return port; |
| 509 | } |
| 510 | |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 511 | extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
| 512 | 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] | 513 | extern int tty_port_carrier_raised(struct tty_port *port); |
Alan Cox | 5d951fb | 2009-01-02 13:45:19 +0000 | [diff] [blame] | 514 | extern void tty_port_raise_dtr_rts(struct tty_port *port); |
Alan Cox | fcc8ac1 | 2009-06-11 12:24:17 +0100 | [diff] [blame] | 515 | extern void tty_port_lower_dtr_rts(struct tty_port *port); |
Alan Cox | 3e61696 | 2009-01-02 13:45:26 +0000 | [diff] [blame] | 516 | extern void tty_port_hangup(struct tty_port *port); |
Alan Cox | 36c621d | 2009-01-02 13:46:10 +0000 | [diff] [blame] | 517 | extern int tty_port_block_til_ready(struct tty_port *port, |
| 518 | struct tty_struct *tty, struct file *filp); |
Alan Cox | a661499 | 2009-01-02 13:46:50 +0000 | [diff] [blame] | 519 | extern int tty_port_close_start(struct tty_port *port, |
| 520 | struct tty_struct *tty, struct file *filp); |
| 521 | 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] | 522 | extern void tty_port_close(struct tty_port *port, |
| 523 | struct tty_struct *tty, struct file *filp); |
Alan Cox | 64bc397 | 2009-10-06 16:06:11 +0100 | [diff] [blame] | 524 | extern int tty_port_open(struct tty_port *port, |
| 525 | struct tty_struct *tty, struct file *filp); |
Randy Dunlap | 2427b8e | 2010-01-15 17:01:11 -0800 | [diff] [blame] | 526 | static inline int tty_port_users(struct tty_port *port) |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 527 | { |
| 528 | return port->count + port->blocked_open; |
| 529 | } |
| 530 | |
Alan Cox | 01e1abb | 2008-07-22 11:16:55 +0100 | [diff] [blame] | 531 | extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
| 532 | extern int tty_unregister_ldisc(int disc); |
| 533 | extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); |
| 534 | extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
| 535 | extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); |
| 536 | extern void tty_ldisc_init(struct tty_struct *tty); |
Jiri Slaby | 6716671 | 2011-03-23 10:48:35 +0100 | [diff] [blame] | 537 | extern void tty_ldisc_deinit(struct tty_struct *tty); |
Alan Cox | 01e1abb | 2008-07-22 11:16:55 +0100 | [diff] [blame] | 538 | extern void tty_ldisc_begin(void); |
| 539 | /* This last one is just for the tty layer internals and shouldn't be used elsewhere */ |
| 540 | extern void tty_ldisc_enable(struct tty_struct *tty); |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 541 | |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | /* n_tty.c */ |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 544 | extern struct tty_ldisc_ops tty_ldisc_N_TTY; |
Rodolfo Giometti | 572b9ad | 2010-03-10 15:23:46 -0800 | [diff] [blame] | 545 | extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 547 | /* tty_audit.c */ |
| 548 | #ifdef CONFIG_AUDIT |
| 549 | extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, |
| 550 | size_t size); |
| 551 | extern void tty_audit_exit(void); |
| 552 | extern void tty_audit_fork(struct signal_struct *sig); |
Al Viro | 1e64174 | 2008-12-09 09:23:33 +0000 | [diff] [blame] | 553 | extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 554 | extern void tty_audit_push(struct tty_struct *tty); |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 555 | extern int tty_audit_push_task(struct task_struct *tsk, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame^] | 556 | kuid_t loginuid, u32 sessionid); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 557 | #else |
| 558 | static inline void tty_audit_add_data(struct tty_struct *tty, |
| 559 | unsigned char *data, size_t size) |
| 560 | { |
| 561 | } |
Al Viro | 1e64174 | 2008-12-09 09:23:33 +0000 | [diff] [blame] | 562 | static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
| 563 | { |
| 564 | } |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 565 | static inline void tty_audit_exit(void) |
| 566 | { |
| 567 | } |
| 568 | static inline void tty_audit_fork(struct signal_struct *sig) |
| 569 | { |
| 570 | } |
| 571 | static inline void tty_audit_push(struct tty_struct *tty) |
| 572 | { |
| 573 | } |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 574 | static inline int tty_audit_push_task(struct task_struct *tsk, |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame^] | 575 | kuid_t loginuid, u32 sessionid) |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 576 | { |
Thomas Gleixner | 3c80fe4 | 2009-12-09 14:19:31 +0000 | [diff] [blame] | 577 | return 0; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 578 | } |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 579 | #endif |
| 580 | |
David Howells | 31d1d48 | 2010-08-06 16:34:43 +0100 | [diff] [blame] | 581 | /* tty_io.c */ |
| 582 | extern int __init tty_init(void); |
| 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* tty_ioctl.c */ |
Alan Cox | 47afa7a | 2008-10-13 10:44:17 +0100 | [diff] [blame] | 585 | 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] | 586 | unsigned int cmd, unsigned long arg); |
Thomas Meyer | 8193c42 | 2011-10-05 23:13:13 +0200 | [diff] [blame] | 587 | extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, |
| 588 | unsigned int cmd, unsigned long arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
| 590 | /* serial.c */ |
| 591 | |
| 592 | extern void serial_console_init(void); |
Alan Cox | 7a4d29f | 2008-07-16 21:54:54 +0100 | [diff] [blame] | 593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | /* pcxx.c */ |
| 595 | |
| 596 | extern int pcxe_open(struct tty_struct *tty, struct file *filp); |
| 597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | /* vt.c */ |
| 599 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 600 | extern int vt_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | unsigned int cmd, unsigned long arg); |
| 602 | |
Greg Kroah-Hartman | 94c2273 | 2011-02-17 12:02:51 -0800 | [diff] [blame] | 603 | extern long vt_compat_ioctl(struct tty_struct *tty, |
Arnd Bergmann | e921665 | 2009-08-06 15:09:28 +0200 | [diff] [blame] | 604 | unsigned int cmd, unsigned long arg); |
| 605 | |
Arnd Bergmann | b07471f | 2010-08-06 21:40:30 +0200 | [diff] [blame] | 606 | /* tty_mutex.c */ |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 607 | /* functions for preparation of BKL removal */ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 608 | extern void __lockfunc tty_lock(void) __acquires(tty_lock); |
| 609 | extern void __lockfunc tty_unlock(void) __releases(tty_lock); |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 610 | |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 611 | /* |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 612 | * this shall be called only from where BTM is held (like close) |
| 613 | * |
| 614 | * We need this to ensure nobody waits for us to finish while we are waiting. |
| 615 | * Without this we were encountering system stalls. |
| 616 | * |
| 617 | * This should be indeed removed with BTM removal later. |
| 618 | * |
| 619 | * Locking: BTM required. Nobody is allowed to hold port->mutex. |
| 620 | */ |
| 621 | static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, |
| 622 | long timeout) |
| 623 | { |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 624 | tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */ |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 625 | tty_wait_until_sent(tty, timeout); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 626 | tty_lock(); |
Jiri Slaby | a57a7bf | 2011-08-25 15:12:06 +0200 | [diff] [blame] | 627 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 629 | /* |
| 630 | * wait_event_interruptible_tty -- wait for a condition with the tty lock held |
| 631 | * |
| 632 | * The condition we are waiting for might take a long time to |
| 633 | * become true, or might depend on another thread taking the |
| 634 | * BTM. In either case, we need to drop the BTM to guarantee |
| 635 | * forward progress. This is a leftover from the conversion |
| 636 | * from the BKL and should eventually get removed as the BTM |
| 637 | * falls out of use. |
| 638 | * |
| 639 | * Do not use in new code. |
| 640 | */ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 641 | #define wait_event_interruptible_tty(wq, condition) \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 642 | ({ \ |
| 643 | int __ret = 0; \ |
| 644 | if (!(condition)) { \ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 645 | __wait_event_interruptible_tty(wq, condition, __ret); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 646 | } \ |
| 647 | __ret; \ |
| 648 | }) |
| 649 | |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 650 | #define __wait_event_interruptible_tty(wq, condition, ret) \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 651 | do { \ |
| 652 | DEFINE_WAIT(__wait); \ |
| 653 | \ |
| 654 | for (;;) { \ |
| 655 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
| 656 | if (condition) \ |
| 657 | break; \ |
| 658 | if (!signal_pending(current)) { \ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 659 | tty_unlock(); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 660 | schedule(); \ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame] | 661 | tty_lock(); \ |
Arnd Bergmann | be1bc28 | 2010-06-01 22:53:05 +0200 | [diff] [blame] | 662 | continue; \ |
| 663 | } \ |
| 664 | ret = -ERESTARTSYS; \ |
| 665 | break; \ |
| 666 | } \ |
| 667 | finish_wait(&wq, &__wait); \ |
| 668 | } while (0) |
| 669 | |
| 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | #endif /* __KERNEL__ */ |
| 672 | #endif |