Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 1999-2000 Digi International (www.digi.com) |
| 4 | * James Puzzo <jamesp at digi dot com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 14 | * PURPOSE. See the GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * |
| 24 | * Filename: |
| 25 | * |
| 26 | * dgrp_ports_ops.c |
| 27 | * |
| 28 | * Description: |
| 29 | * |
| 30 | * Handle the file operations required for the /proc/dgrp/ports/... |
| 31 | * devices. Basically gathers tty status for the node and returns it. |
| 32 | * |
| 33 | * Author: |
| 34 | * |
| 35 | * James A. Puzzo |
| 36 | * |
| 37 | */ |
| 38 | |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/proc_fs.h> |
| 41 | #include <linux/tty.h> |
| 42 | #include <linux/sched.h> |
| 43 | #include <linux/seq_file.h> |
| 44 | |
| 45 | #include "dgrp_common.h" |
| 46 | |
| 47 | /* File operation declarations */ |
| 48 | static int dgrp_ports_open(struct inode *, struct file *); |
| 49 | |
Al Viro | af064cd | 2013-03-30 01:03:53 -0400 | [diff] [blame] | 50 | const struct file_operations dgrp_ports_ops = { |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 51 | .owner = THIS_MODULE, |
| 52 | .open = dgrp_ports_open, |
| 53 | .read = seq_read, |
| 54 | .llseek = seq_lseek, |
| 55 | .release = seq_release |
| 56 | }; |
| 57 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 58 | static void *dgrp_ports_seq_start(struct seq_file *seq, loff_t *pos) |
| 59 | { |
| 60 | if (*pos == 0) |
| 61 | seq_puts(seq, "#num tty_open pr_open tot_wait MSTAT IFLAG OFLAG CFLAG BPS DIGIFLAGS\n"); |
| 62 | |
| 63 | return pos; |
| 64 | } |
| 65 | |
| 66 | static void *dgrp_ports_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 67 | { |
| 68 | struct nd_struct *nd = seq->private; |
| 69 | |
| 70 | if (*pos >= nd->nd_chan_count) |
| 71 | return NULL; |
| 72 | |
| 73 | *pos += 1; |
| 74 | |
| 75 | return pos; |
| 76 | } |
| 77 | |
| 78 | static void dgrp_ports_seq_stop(struct seq_file *seq, void *v) |
| 79 | { |
| 80 | } |
| 81 | |
| 82 | static int dgrp_ports_seq_show(struct seq_file *seq, void *v) |
| 83 | { |
| 84 | loff_t *pos = v; |
| 85 | struct nd_struct *nd; |
| 86 | struct ch_struct *ch; |
| 87 | struct un_struct *tun, *pun; |
| 88 | unsigned int totcnt; |
| 89 | |
| 90 | nd = seq->private; |
| 91 | if (!nd) |
| 92 | return 0; |
| 93 | |
| 94 | if (*pos >= nd->nd_chan_count) |
| 95 | return 0; |
| 96 | |
| 97 | ch = &nd->nd_chan[*pos]; |
| 98 | tun = &ch->ch_tun; |
| 99 | pun = &ch->ch_pun; |
| 100 | |
| 101 | /* |
| 102 | * If port is not open and no one is waiting to |
| 103 | * open it, the modem signal values can't be |
| 104 | * trusted, and will be zeroed. |
| 105 | */ |
| 106 | totcnt = tun->un_open_count + |
| 107 | pun->un_open_count + |
| 108 | ch->ch_wait_count[0] + |
| 109 | ch->ch_wait_count[1] + |
| 110 | ch->ch_wait_count[2]; |
| 111 | |
| 112 | seq_printf(seq, "%02d %02d %02d %02d 0x%04X 0x%04X 0x%04X 0x%04X %-6d 0x%04X\n", |
| 113 | (int) *pos, |
| 114 | tun->un_open_count, |
| 115 | pun->un_open_count, |
| 116 | ch->ch_wait_count[0] + |
| 117 | ch->ch_wait_count[1] + |
| 118 | ch->ch_wait_count[2], |
| 119 | (totcnt ? ch->ch_s_mlast : 0), |
| 120 | ch->ch_s_iflag, |
| 121 | ch->ch_s_oflag, |
| 122 | ch->ch_s_cflag, |
| 123 | (ch->ch_s_brate ? (1843200 / ch->ch_s_brate) : 0), |
| 124 | ch->ch_digi.digi_flags); |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static const struct seq_operations ports_seq_ops = { |
| 130 | .start = dgrp_ports_seq_start, |
| 131 | .next = dgrp_ports_seq_next, |
| 132 | .stop = dgrp_ports_seq_stop, |
| 133 | .show = dgrp_ports_seq_show, |
| 134 | }; |
| 135 | |
| 136 | /** |
| 137 | * dgrp_ports_open -- open the /proc/dgrp/ports/... device |
| 138 | * @inode: struct inode * |
| 139 | * @file: struct file * |
| 140 | * |
| 141 | * Open function to open the /proc/dgrp/ports device for a PortServer. |
| 142 | * This is the open function for struct file_operations |
| 143 | */ |
| 144 | static int dgrp_ports_open(struct inode *inode, struct file *file) |
| 145 | { |
| 146 | struct seq_file *seq; |
| 147 | int rtn; |
| 148 | |
| 149 | rtn = seq_open(file, &ports_seq_ops); |
| 150 | if (!rtn) { |
| 151 | seq = file->private_data; |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 152 | seq->private = PDE_DATA(inode); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | return rtn; |
| 156 | } |