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0b52b749 BP |
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 | ||
af064cdd | 50 | const struct file_operations dgrp_ports_ops = { |
0b52b749 BP |
51 | .owner = THIS_MODULE, |
52 | .open = dgrp_ports_open, | |
53 | .read = seq_read, | |
54 | .llseek = seq_lseek, | |
55 | .release = seq_release | |
56 | }; | |
57 | ||
0b52b749 BP |
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; | |
d9dda78b | 152 | seq->private = PDE_DATA(inode); |
0b52b749 BP |
153 | } |
154 | ||
155 | return rtn; | |
156 | } |