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 int len; 33 dev_t dev = 0; 34 35 if (con->device) { 36 const struct tty_driver *driver; 37 int index; 38 driver = con->device(con, &index); 39 if (driver) { 40 dev = MKDEV(driver->major, driver->minor_start); 41 dev += index; 42 } 43 } 44 45 for (a = 0; a < ARRAY_SIZE(con_flags); a++) 46 flags[a] = (con->flags & con_flags[a].flag) ? 47 con_flags[a].name : ' '; 48 flags[a] = 0; 49 50 seq_printf(m, "%s%d%n", con->name, con->index, &len); 51 len = 21 - len; 52 if (len < 1) 53 len = 1; 54 seq_printf(m, "%*c%c%c%c (%s)", len, ' ', con->read ? 'R' : '-', 55 con->write ? 'W' : '-', con->unblank ? 'U' : '-', 56 flags); 57 if (dev) 58 seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev)); 59 60 seq_printf(m, "\n"); 61 62 return 0; 63 } 64 65 static void *c_start(struct seq_file *m, loff_t *pos) 66 { 67 struct console *con; 68 loff_t off = 0; 69 70 console_lock(); 71 for_each_console(con) 72 if (off++ == *pos) 73 break; 74 75 return con; 76 } 77 78 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 79 { 80 struct console *con = v; 81 ++*pos; 82 return con->next; 83 } 84 85 static void c_stop(struct seq_file *m, void *v) 86 { 87 console_unlock(); 88 } 89 90 static const struct seq_operations consoles_op = { 91 .start = c_start, 92 .next = c_next, 93 .stop = c_stop, 94 .show = show_console_dev 95 }; 96 97 static int consoles_open(struct inode *inode, struct file *file) 98 { 99 return seq_open(file, &consoles_op); 100 } 101 102 static const struct file_operations proc_consoles_operations = { 103 .open = consoles_open, 104 .read = seq_read, 105 .llseek = seq_lseek, 106 .release = seq_release, 107 }; 108 109 static int __init proc_consoles_init(void) 110 { 111 proc_create("consoles", 0, NULL, &proc_consoles_operations); 112 return 0; 113 } 114 module_init(proc_consoles_init); 115