3 * Copyright 1999 Digi International (www.digi.com)
4 * James Puzzo <jamesp at digi dot com>
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)
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.
26 * Handle the "config" proc entry for the linux realport device driver
27 * and provide slots for the "net" and "mon" devices
35 #include <linux/module.h>
36 #include <linux/tty.h>
37 #include <linux/sched.h>
38 #include <linux/cred.h>
39 #include <linux/proc_fs.h>
40 #include <linux/ctype.h>
41 #include <linux/seq_file.h>
42 #include <linux/uaccess.h>
43 #include <linux/vmalloc.h>
45 #include "dgrp_common.h"
47 static struct dgrp_proc_entry dgrp_table[];
48 static struct proc_dir_entry *dgrp_proc_dir_entry;
50 static int dgrp_add_id(long id);
51 static int dgrp_remove_nd(struct nd_struct *nd);
52 static void unregister_dgrp_device(struct proc_dir_entry *de);
53 static void register_dgrp_device(struct nd_struct *node,
54 struct proc_dir_entry *root,
55 void (*register_hook)(struct proc_dir_entry *de));
57 /* File operation declarations */
58 static int dgrp_gen_proc_open(struct inode *, struct file *);
59 static int dgrp_gen_proc_close(struct inode *, struct file *);
60 static int parse_write_config(char *);
63 static const struct file_operations dgrp_proc_file_ops = {
65 .open = dgrp_gen_proc_open,
66 .release = dgrp_gen_proc_close,
69 static struct inode_operations proc_inode_ops = {
70 .permission = dgrp_inode_permission
74 static void register_proc_table(struct dgrp_proc_entry *,
75 struct proc_dir_entry *);
76 static void unregister_proc_table(struct dgrp_proc_entry *,
77 struct proc_dir_entry *);
79 static struct dgrp_proc_entry dgrp_net_table[];
80 static struct dgrp_proc_entry dgrp_mon_table[];
81 static struct dgrp_proc_entry dgrp_ports_table[];
82 static struct dgrp_proc_entry dgrp_dpa_table[];
84 static ssize_t config_proc_write(struct file *file, const char __user *buffer,
85 size_t count, loff_t *pos);
87 static int nodeinfo_proc_open(struct inode *inode, struct file *file);
88 static int info_proc_open(struct inode *inode, struct file *file);
89 static int config_proc_open(struct inode *inode, struct file *file);
91 static struct file_operations config_proc_file_ops = {
93 .open = config_proc_open,
96 .release = seq_release,
97 .write = config_proc_write
100 static struct file_operations info_proc_file_ops = {
101 .owner = THIS_MODULE,
102 .open = info_proc_open,
105 .release = seq_release,
108 static struct file_operations nodeinfo_proc_file_ops = {
109 .owner = THIS_MODULE,
110 .open = nodeinfo_proc_open,
113 .release = seq_release,
116 static struct dgrp_proc_entry dgrp_table[] = {
121 .proc_file_ops = &config_proc_file_ops,
127 .proc_file_ops = &info_proc_file_ops,
133 .proc_file_ops = &nodeinfo_proc_file_ops,
139 .child = dgrp_net_table
145 .child = dgrp_mon_table
151 .child = dgrp_ports_table
157 .child = dgrp_dpa_table
161 static struct proc_dir_entry *net_entry_pointer;
162 static struct proc_dir_entry *mon_entry_pointer;
163 static struct proc_dir_entry *dpa_entry_pointer;
164 static struct proc_dir_entry *ports_entry_pointer;
166 static struct dgrp_proc_entry dgrp_net_table[] = {
170 static struct dgrp_proc_entry dgrp_mon_table[] = {
174 static struct dgrp_proc_entry dgrp_ports_table[] = {
178 static struct dgrp_proc_entry dgrp_dpa_table[] = {
182 void dgrp_unregister_proc(void)
184 unregister_proc_table(dgrp_table, dgrp_proc_dir_entry);
185 net_entry_pointer = NULL;
186 mon_entry_pointer = NULL;
187 dpa_entry_pointer = NULL;
188 ports_entry_pointer = NULL;
190 if (dgrp_proc_dir_entry) {
191 remove_proc_entry(dgrp_proc_dir_entry->name,
192 dgrp_proc_dir_entry->parent);
193 dgrp_proc_dir_entry = NULL;
198 void dgrp_register_proc(void)
201 * Register /proc/dgrp
203 dgrp_proc_dir_entry = proc_create("dgrp", S_IFDIR, NULL,
204 &dgrp_proc_file_ops);
205 register_proc_table(dgrp_table, dgrp_proc_dir_entry);
211 static int dgrp_proc_match(int len, const char *name, struct proc_dir_entry *de)
213 if (!de || !de->low_ino)
215 if (de->namelen != len)
217 return !memcmp(name, de->name, len);
222 * Scan the entries in table and add them all to /proc at the position
223 * referred to by "root"
225 static void register_proc_table(struct dgrp_proc_entry *table,
226 struct proc_dir_entry *root)
228 struct proc_dir_entry *de;
235 for (; table->id; table++) {
236 /* Can't do anything without a proc name. */
240 /* Maybe we can't do anything with it... */
241 if (!table->proc_file_ops &&
243 pr_warn("dgrp: Can't register %s\n",
248 len = strlen(table->name);
256 for (de = root->subdir; de; de = de->next) {
257 if (dgrp_proc_match(len, table->name, de))
260 /* If the subdir exists already, de is non-NULL */
264 de = create_proc_entry(table->name, mode, root);
267 de->data = (void *) table;
269 de->proc_iops = &proc_inode_ops;
270 if (table->proc_file_ops)
271 de->proc_fops = table->proc_file_ops;
273 de->proc_fops = &dgrp_proc_file_ops;
277 if (de->mode & S_IFDIR)
278 register_proc_table(table->child, de);
280 if (table->id == DGRP_NETDIR)
281 net_entry_pointer = de;
283 if (table->id == DGRP_MONDIR)
284 mon_entry_pointer = de;
286 if (table->id == DGRP_DPADIR)
287 dpa_entry_pointer = de;
289 if (table->id == DGRP_PORTSDIR)
290 ports_entry_pointer = de;
295 * Unregister a /proc sysctl table and any subdirectories.
297 static void unregister_proc_table(struct dgrp_proc_entry *table,
298 struct proc_dir_entry *root)
300 struct proc_dir_entry *de;
301 struct nd_struct *tmp;
306 list_for_each_entry(tmp, &nd_struct_list, list) {
307 if ((table == dgrp_net_table) && (tmp->nd_net_de)) {
308 unregister_dgrp_device(tmp->nd_net_de);
309 dgrp_remove_node_class_sysfs_files(tmp);
312 if ((table == dgrp_mon_table) && (tmp->nd_mon_de))
313 unregister_dgrp_device(tmp->nd_mon_de);
315 if ((table == dgrp_dpa_table) && (tmp->nd_dpa_de))
316 unregister_dgrp_device(tmp->nd_dpa_de);
318 if ((table == dgrp_ports_table) && (tmp->nd_ports_de))
319 unregister_dgrp_device(tmp->nd_ports_de);
322 for (; table->id; table++) {
327 if (de->mode & S_IFDIR) {
329 pr_alert("dgrp: malformed sysctl tree on free\n");
332 unregister_proc_table(table->child, de);
334 /* Don't unregister directories which still have entries */
339 /* Don't unregister proc entries that are still being used.. */
340 if ((atomic_read(&de->count)) != 1) {
341 pr_alert("proc entry %s in use, not removing\n",
346 remove_proc_entry(de->name, de->parent);
351 static int dgrp_gen_proc_open(struct inode *inode, struct file *file)
353 struct proc_dir_entry *de;
354 struct dgrp_proc_entry *entry;
357 de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode);
358 if (!de || !de->data) {
363 entry = (struct dgrp_proc_entry *) de->data;
369 down(&entry->excl_sem);
376 up(&entry->excl_sem);
382 static int dgrp_gen_proc_close(struct inode *inode, struct file *file)
384 struct proc_dir_entry *de;
385 struct dgrp_proc_entry *entry;
387 de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode);
388 if (!de || !de->data)
391 entry = (struct dgrp_proc_entry *) de->data;
395 down(&entry->excl_sem);
400 up(&entry->excl_sem);
406 static void *config_proc_start(struct seq_file *m, loff_t *pos)
408 return seq_list_start_head(&nd_struct_list, *pos);
411 static void *config_proc_next(struct seq_file *p, void *v, loff_t *pos)
413 return seq_list_next(v, &nd_struct_list, pos);
416 static void config_proc_stop(struct seq_file *m, void *v)
420 static int config_proc_show(struct seq_file *m, void *v)
422 struct nd_struct *nd;
425 if (v == &nd_struct_list) {
426 seq_puts(m, "#-----------------------------------------------------------------------------\n");
427 seq_puts(m, "# Avail\n");
428 seq_puts(m, "# ID Major State Ports\n");
432 nd = list_entry(v, struct nd_struct, list);
434 ID_TO_CHAR(nd->nd_ID, tmp_id);
436 seq_printf(m, " %-2.2s %-5ld %-10.10s %-5d\n",
439 ND_STATE_STR(nd->nd_state),
445 static const struct seq_operations proc_config_ops = {
446 .start = config_proc_start,
447 .next = config_proc_next,
448 .stop = config_proc_stop,
449 .show = config_proc_show
452 static int config_proc_open(struct inode *inode, struct file *file)
454 return seq_open(file, &proc_config_ops);
459 * When writing configuration information, each "record" (i.e. each
460 * write) is treated as an independent request. See the "parse"
461 * description for more details.
463 static ssize_t config_proc_write(struct file *file, const char __user *buffer,
464 size_t count, loff_t *pos)
473 inbuf = sp = vzalloc(count + 1);
477 if (copy_from_user(inbuf, buffer, count)) {
486 line = strpbrk(sp, ldelim);
489 retval = parse_write_config(sp);
494 line = strpbrk(sp, ldelim);
504 * ------------------------------------------------------------------------
506 * The following are the functions to parse input
508 * ------------------------------------------------------------------------
510 static inline char *skip_past_ws(const char *str)
512 while ((*str) && !isspace(*str))
515 return skip_spaces(str);
518 static int parse_id(char **c, char *cID)
522 if (isalnum(tmp) || (tmp == '_'))
529 if (isalnum(tmp) || (tmp == '_')) {
538 static int parse_add_config(char *buf)
547 retval = parse_id(&c, cID);
551 ID = CHAR_TO_ID(cID);
555 return dgrp_add_id(ID);
558 static int parse_del_config(char *buf)
562 struct nd_struct *nd;
569 retval = parse_id(&c, cID);
573 ID = CHAR_TO_ID(cID);
577 retval = kstrtol(c, 10, &major);
581 nd = nd_struct_get(major);
585 if ((nd->nd_major != major) || (nd->nd_ID != ID))
588 return dgrp_remove_nd(nd);
591 static int parse_chg_config(char *buf)
597 * The passed character buffer represents a single configuration request.
598 * If the first character is a "+", it is parsed as a request to add a
600 * If the first character is a "-", it is parsed as a request to delete a
602 * If the first character is a "*", it is parsed as a request to change a
604 * Any other character (including whitespace) causes the record to be
607 static int parse_write_config(char *buf)
613 retval = parse_add_config(buf);
616 retval = parse_del_config(buf);
619 retval = parse_chg_config(buf);
628 static int info_proc_show(struct seq_file *m, void *v)
630 seq_printf(m, "version: %s\n", DIGI_VERSION);
631 seq_puts(m, "register_with_sysfs: 1\n");
632 seq_printf(m, "pollrate: 0x%08x\t(%d)\n",
633 dgrp_poll_tick, dgrp_poll_tick);
638 static int info_proc_open(struct inode *inode, struct file *file)
640 return single_open(file, info_proc_show, NULL);
644 static void *nodeinfo_start(struct seq_file *m, loff_t *pos)
646 return seq_list_start_head(&nd_struct_list, *pos);
649 static void *nodeinfo_next(struct seq_file *p, void *v, loff_t *pos)
651 return seq_list_next(v, &nd_struct_list, pos);
654 static void nodeinfo_stop(struct seq_file *m, void *v)
658 static int nodeinfo_show(struct seq_file *m, void *v)
660 struct nd_struct *nd;
665 if (v == &nd_struct_list) {
666 seq_puts(m, "#-----------------------------------------------------------------------------\n");
667 seq_puts(m, "# HW HW SW\n");
668 seq_puts(m, "# ID State Version ID Version Description\n");
672 nd = list_entry(v, struct nd_struct, list);
674 ID_TO_CHAR(nd->nd_ID, tmp_id);
676 if (nd->nd_state == NS_READY) {
677 sprintf(hwver, "%d.%d", (nd->nd_hw_ver >> 8) & 0xff,
678 nd->nd_hw_ver & 0xff);
679 sprintf(swver, "%d.%d", (nd->nd_sw_ver >> 8) & 0xff,
680 nd->nd_sw_ver & 0xff);
681 seq_printf(m, " %-2.2s %-10.10s %-7.7s %-3d %-7.7s %-35.35s\n",
683 ND_STATE_STR(nd->nd_state),
690 seq_printf(m, " %-2.2s %-10.10s\n",
692 ND_STATE_STR(nd->nd_state));
699 static const struct seq_operations nodeinfo_ops = {
700 .start = nodeinfo_start,
701 .next = nodeinfo_next,
702 .stop = nodeinfo_stop,
703 .show = nodeinfo_show
706 static int nodeinfo_proc_open(struct inode *inode, struct file *file)
708 return seq_open(file, &nodeinfo_ops);
712 * dgrp_add_id() -- creates new nd struct and adds it to list
713 * @id: id of device to add
715 static int dgrp_add_id(long id)
717 struct nd_struct *nd;
721 nd = kzalloc(sizeof(struct nd_struct), GFP_KERNEL);
728 spin_lock_init(&nd->nd_lock);
730 init_waitqueue_head(&nd->nd_tx_waitq);
731 init_waitqueue_head(&nd->nd_mon_wqueue);
732 init_waitqueue_head(&nd->nd_dpa_wqueue);
733 for (i = 0; i < SEQ_MAX; i++)
734 init_waitqueue_head(&nd->nd_seq_wque[i]);
736 /* setup the structures to get the major number */
737 ret = dgrp_tty_init(nd);
741 nd->nd_major = nd->nd_serial_ttdriver->major;
743 ret = nd_struct_add(nd);
747 register_dgrp_device(nd, net_entry_pointer, dgrp_register_net_hook);
748 register_dgrp_device(nd, mon_entry_pointer, dgrp_register_mon_hook);
749 register_dgrp_device(nd, dpa_entry_pointer, dgrp_register_dpa_hook);
750 register_dgrp_device(nd, ports_entry_pointer,
751 dgrp_register_ports_hook);
755 /* FIXME this guy should free the tty driver stored in nd and destroy
756 * all channel ports */
763 static int dgrp_remove_nd(struct nd_struct *nd)
767 /* Check to see if the selected structure is in use */
768 if (nd->nd_tty_ref_cnt)
772 unregister_dgrp_device(nd->nd_net_de);
773 dgrp_remove_node_class_sysfs_files(nd);
777 unregister_dgrp_device(nd->nd_mon_de);
780 unregister_dgrp_device(nd->nd_ports_de);
783 unregister_dgrp_device(nd->nd_dpa_de);
787 ret = nd_struct_del(nd);
795 static void register_dgrp_device(struct nd_struct *node,
796 struct proc_dir_entry *root,
797 void (*register_hook)(struct proc_dir_entry *de))
800 struct proc_dir_entry *de;
802 ID_TO_CHAR(node->nd_ID, buf);
804 de = create_proc_entry(buf, 0600 | S_IFREG, root);
808 de->data = (void *) node;
815 static void unregister_dgrp_device(struct proc_dir_entry *de)
820 /* Don't unregister proc entries that are still being used.. */
821 if ((atomic_read(&de->count)) != 1) {
822 pr_alert("%s - proc entry %s in use. Not removing.\n",
827 remove_proc_entry(de->name, de->parent);