1 /* 2 * Copyright (c) 2010 Werner Fink, Jiri Slaby 3 * 4 * Licensed under GPLv2 5 */ 6 7 #include <linux/console.h> 8 #include <linux/kernel.h> 9 #include <linux/proc_fs.h> 10 #include <linux/seq_file.h> 11 #include <linux/tty_driver.h> 12 13 /* 14 * This is handler for /proc/consoles 15 */ 16 static int show_console_dev(struct seq_file *m, void *v) 17 { 18 static const struct { 19 short flag; 20 char name; 21 } con_flags[] = { 22 { CON_ENABLED, 'E' }, 23 { CON_CONSDEV, 'C' }, 24 { CON_BOOT, 'B' }, 25 { CON_PRINTBUFFER, 'p' }, 26 { CON_BRL, 'b' }, 27 { CON_ANYTIME, 'a' }, 28 }; 29 char flags[ARRAY_SIZE(con_flags) + 1]; 30 struct console *con = v; 31 unsigned int a; 32 dev_t dev = 0; 33 34 if (con->device) { 35 const struct tty_driver *driver; 36 int index; 37 driver = con->device(con, &index); 38 if (driver) { 39 dev = MKDEV(driver->major, driver->minor_start); 40 dev += index; 41 } 42 } 43 44 for (a = 0; a < ARRAY_SIZE(con_flags); a++) 45 flags[a] = (con->flags & con_flags[a].flag) ? 46 con_flags[a].name : ' '; 47 flags[a] = 0; 48 49 seq_setwidth(m, 21 - 1); 50 seq_printf(m, "%s%d", con->name, con->index); 51 seq_pad(m, ' '); 52 seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-', 53 con->write ? 'W' : '-', con->unblank ? 'U' : '-', 54 flags); 55 if (dev) 56 seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev)); 57 58 seq_printf(m, "\n"); 59 60 return 0; 61 } 62 63 static void *c_start(struct seq_file *m, loff_t *pos) 64 { 65 struct console *con; 66 loff_t off = 0; 67 68 console_lock(); 69 for_each_console(con) 70 if (off++ == *pos) 71 break; 72 73 return con; 74 } 75 76 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 77 { 78 struct console *con = v; 79 ++*pos; 80 return con->next; 81 } 82 83 static void c_stop(struct seq_file *m, void *v) 84 { 85 console_unlock(); 86 } 87 88 static const struct seq_operations consoles_op = { 89 .start = c_start, 90 .next = c_next, 91 .stop = c_stop, 92 .show = show_console_dev 93 }; 94 95 static int consoles_open(struct inode *inode, struct file *file) 96 { 97 return seq_open(file, &consoles_op); 98 } 99 100 static const struct file_operations proc_consoles_operations = { 101 .open = consoles_open, 102 .read = seq_read, 103 .llseek = seq_lseek, 104 .release = seq_release, 105 }; 106 107 static int __init proc_consoles_init(void) 108 { 109 proc_create("consoles", 0, NULL, &proc_consoles_operations); 110 return 0; 111 } 112 fs_initcall(proc_consoles_init); 113