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path: root/drivers/staging/dgrp/dgrp_specproc.c
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Diffstat (limited to 'drivers/staging/dgrp/dgrp_specproc.c')
-rw-r--r--drivers/staging/dgrp/dgrp_specproc.c541
1 files changed, 541 insertions, 0 deletions
diff --git a/drivers/staging/dgrp/dgrp_specproc.c b/drivers/staging/dgrp/dgrp_specproc.c
new file mode 100644
index 00000000..205d80ef
--- /dev/null
+++ b/drivers/staging/dgrp/dgrp_specproc.c
@@ -0,0 +1,541 @@
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_specproc.c
+ *
+ * Description:
+ *
+ * Handle the "config" proc entry for the linux realport device driver
+ * and provide slots for the "net" and "mon" devices
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/ctype.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+
+#include "dgrp_common.h"
+
+static struct proc_dir_entry *dgrp_proc_dir_entry;
+
+static int dgrp_add_id(long id);
+static int dgrp_remove_nd(struct nd_struct *nd);
+static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
+ struct proc_dir_entry *root,
+ const struct file_operations *fops);
+
+/* File operation declarations */
+static int parse_write_config(char *);
+
+static ssize_t dgrp_config_proc_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *pos);
+
+static int dgrp_nodeinfo_proc_open(struct inode *inode, struct file *file);
+static int dgrp_info_proc_open(struct inode *inode, struct file *file);
+static int dgrp_config_proc_open(struct inode *inode, struct file *file);
+
+static const struct file_operations config_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = dgrp_config_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+ .write = dgrp_config_proc_write,
+};
+
+static const struct file_operations info_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = dgrp_info_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations nodeinfo_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = dgrp_nodeinfo_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static struct proc_dir_entry *net_entry_pointer;
+static struct proc_dir_entry *mon_entry_pointer;
+static struct proc_dir_entry *dpa_entry_pointer;
+static struct proc_dir_entry *ports_entry_pointer;
+
+static void remove_files(struct nd_struct *nd)
+{
+ char buf[3];
+ ID_TO_CHAR(nd->nd_ID, buf);
+ dgrp_remove_node_class_sysfs_files(nd);
+ if (nd->nd_net_de)
+ remove_proc_entry(buf, net_entry_pointer);
+ if (nd->nd_mon_de)
+ remove_proc_entry(buf, mon_entry_pointer);
+ if (nd->nd_dpa_de)
+ remove_proc_entry(buf, dpa_entry_pointer);
+ if (nd->nd_ports_de)
+ remove_proc_entry(buf, ports_entry_pointer);
+}
+
+void dgrp_unregister_proc(void)
+{
+ net_entry_pointer = NULL;
+ mon_entry_pointer = NULL;
+ dpa_entry_pointer = NULL;
+ ports_entry_pointer = NULL;
+
+ if (dgrp_proc_dir_entry) {
+ struct nd_struct *nd;
+ list_for_each_entry(nd, &nd_struct_list, list)
+ remove_files(nd);
+ remove_proc_entry("dgrp/config", NULL);
+ remove_proc_entry("dgrp/info", NULL);
+ remove_proc_entry("dgrp/nodeinfo", NULL);
+ remove_proc_entry("dgrp/net", NULL);
+ remove_proc_entry("dgrp/mon", NULL);
+ remove_proc_entry("dgrp/dpa", NULL);
+ remove_proc_entry("dgrp/ports", NULL);
+ remove_proc_entry("dgrp", NULL);
+ dgrp_proc_dir_entry = NULL;
+ }
+}
+
+void dgrp_register_proc(void)
+{
+ /*
+ * Register /proc/dgrp
+ */
+ dgrp_proc_dir_entry = proc_mkdir("dgrp", NULL);
+ if (!dgrp_proc_dir_entry)
+ return;
+ proc_create("dgrp/config", 0644, NULL, &config_proc_file_ops);
+ proc_create("dgrp/info", 0644, NULL, &info_proc_file_ops);
+ proc_create("dgrp/nodeinfo", 0644, NULL, &nodeinfo_proc_file_ops);
+ net_entry_pointer = proc_mkdir_mode("dgrp/net", 0500, NULL);
+ mon_entry_pointer = proc_mkdir_mode("dgrp/mon", 0500, NULL);
+ dpa_entry_pointer = proc_mkdir_mode("dgrp/dpa", 0500, NULL);
+ ports_entry_pointer = proc_mkdir_mode("dgrp/ports", 0500, NULL);
+}
+
+static void *dgrp_config_proc_start(struct seq_file *m, loff_t *pos)
+{
+ return seq_list_start_head(&nd_struct_list, *pos);
+}
+
+static void *dgrp_config_proc_next(struct seq_file *p, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &nd_struct_list, pos);
+}
+
+static void dgrp_config_proc_stop(struct seq_file *m, void *v)
+{
+}
+
+static int dgrp_config_proc_show(struct seq_file *m, void *v)
+{
+ struct nd_struct *nd;
+ char tmp_id[4];
+
+ if (v == &nd_struct_list) {
+ seq_puts(m, "#-----------------------------------------------------------------------------\n");
+ seq_puts(m, "# Avail\n");
+ seq_puts(m, "# ID Major State Ports\n");
+ return 0;
+ }
+
+ nd = list_entry(v, struct nd_struct, list);
+
+ ID_TO_CHAR(nd->nd_ID, tmp_id);
+
+ seq_printf(m, " %-2.2s %-5ld %-10.10s %-5d\n",
+ tmp_id,
+ nd->nd_major,
+ ND_STATE_STR(nd->nd_state),
+ nd->nd_chan_count);
+
+ return 0;
+}
+
+static const struct seq_operations proc_config_ops = {
+ .start = dgrp_config_proc_start,
+ .next = dgrp_config_proc_next,
+ .stop = dgrp_config_proc_stop,
+ .show = dgrp_config_proc_show,
+};
+
+static int dgrp_config_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &proc_config_ops);
+}
+
+
+/*
+ * When writing configuration information, each "record" (i.e. each
+ * write) is treated as an independent request. See the "parse"
+ * description for more details.
+ */
+static ssize_t dgrp_config_proc_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *pos)
+{
+ ssize_t retval;
+ char *inbuf, *sp;
+ char *line, *ldelim;
+
+ if (count > 32768)
+ return -EINVAL;
+
+ inbuf = sp = vzalloc(count + 1);
+ if (!inbuf)
+ return -ENOMEM;
+
+ if (copy_from_user(inbuf, buffer, count)) {
+ retval = -EFAULT;
+ goto done;
+ }
+
+ inbuf[count] = 0;
+
+ ldelim = "\n";
+
+ line = strpbrk(sp, ldelim);
+ while (line) {
+ *line = 0;
+ retval = parse_write_config(sp);
+ if (retval)
+ goto done;
+
+ sp = line + 1;
+ line = strpbrk(sp, ldelim);
+ }
+
+ retval = count;
+done:
+ vfree(inbuf);
+ return retval;
+}
+
+/*
+ * ------------------------------------------------------------------------
+ *
+ * The following are the functions to parse input
+ *
+ * ------------------------------------------------------------------------
+ */
+static inline char *skip_past_ws(const char *str)
+{
+ while ((*str) && !isspace(*str))
+ ++str;
+
+ return skip_spaces(str);
+}
+
+static int parse_id(char **c, char *cID)
+{
+ int tmp = **c;
+
+ if (isalnum(tmp) || (tmp == '_'))
+ cID[0] = tmp;
+ else
+ return -EINVAL;
+
+ (*c)++; tmp = **c;
+
+ if (isalnum(tmp) || (tmp == '_')) {
+ cID[1] = tmp;
+ (*c)++;
+ } else
+ cID[1] = 0;
+
+ return 0;
+}
+
+static int parse_add_config(char *buf)
+{
+ char *c = buf;
+ int retval;
+ char cID[2];
+ long ID;
+
+ c = skip_past_ws(c);
+
+ retval = parse_id(&c, cID);
+ if (retval < 0)
+ return retval;
+
+ ID = CHAR_TO_ID(cID);
+
+ c = skip_past_ws(c);
+
+ return dgrp_add_id(ID);
+}
+
+static int parse_del_config(char *buf)
+{
+ char *c = buf;
+ int retval;
+ struct nd_struct *nd;
+ char cID[2];
+ long ID;
+ long major;
+
+ c = skip_past_ws(c);
+
+ retval = parse_id(&c, cID);
+ if (retval < 0)
+ return retval;
+
+ ID = CHAR_TO_ID(cID);
+
+ c = skip_past_ws(c);
+
+ retval = kstrtol(c, 10, &major);
+ if (retval)
+ return retval;
+
+ nd = nd_struct_get(major);
+ if (!nd)
+ return -EINVAL;
+
+ if ((nd->nd_major != major) || (nd->nd_ID != ID))
+ return -EINVAL;
+
+ return dgrp_remove_nd(nd);
+}
+
+static int parse_chg_config(char *buf)
+{
+ return -EINVAL;
+}
+
+/*
+ * The passed character buffer represents a single configuration request.
+ * If the first character is a "+", it is parsed as a request to add a
+ * PortServer
+ * If the first character is a "-", it is parsed as a request to delete a
+ * PortServer
+ * If the first character is a "*", it is parsed as a request to change a
+ * PortServer
+ * Any other character (including whitespace) causes the record to be
+ * ignored.
+ */
+static int parse_write_config(char *buf)
+{
+ int retval;
+
+ switch (buf[0]) {
+ case '+':
+ retval = parse_add_config(buf);
+ break;
+ case '-':
+ retval = parse_del_config(buf);
+ break;
+ case '*':
+ retval = parse_chg_config(buf);
+ break;
+ default:
+ retval = -EINVAL;
+ }
+
+ return retval;
+}
+
+static int dgrp_info_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "version: %s\n", DIGI_VERSION);
+ seq_puts(m, "register_with_sysfs: 1\n");
+ seq_printf(m, "pollrate: 0x%08x\t(%d)\n",
+ dgrp_poll_tick, dgrp_poll_tick);
+
+ return 0;
+}
+
+static int dgrp_info_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dgrp_info_proc_show, NULL);
+}
+
+
+static void *dgrp_nodeinfo_start(struct seq_file *m, loff_t *pos)
+{
+ return seq_list_start_head(&nd_struct_list, *pos);
+}
+
+static void *dgrp_nodeinfo_next(struct seq_file *p, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &nd_struct_list, pos);
+}
+
+static void dgrp_nodeinfo_stop(struct seq_file *m, void *v)
+{
+}
+
+static int dgrp_nodeinfo_show(struct seq_file *m, void *v)
+{
+ struct nd_struct *nd;
+ char hwver[8];
+ char swver[8];
+ char tmp_id[4];
+
+ if (v == &nd_struct_list) {
+ seq_puts(m, "#-----------------------------------------------------------------------------\n");
+ seq_puts(m, "# HW HW SW\n");
+ seq_puts(m, "# ID State Version ID Version Description\n");
+ return 0;
+ }
+
+ nd = list_entry(v, struct nd_struct, list);
+
+ ID_TO_CHAR(nd->nd_ID, tmp_id);
+
+ if (nd->nd_state == NS_READY) {
+ sprintf(hwver, "%d.%d", (nd->nd_hw_ver >> 8) & 0xff,
+ nd->nd_hw_ver & 0xff);
+ sprintf(swver, "%d.%d", (nd->nd_sw_ver >> 8) & 0xff,
+ nd->nd_sw_ver & 0xff);
+ seq_printf(m, " %-2.2s %-10.10s %-7.7s %-3d %-7.7s %-35.35s\n",
+ tmp_id,
+ ND_STATE_STR(nd->nd_state),
+ hwver,
+ nd->nd_hw_id,
+ swver,
+ nd->nd_ps_desc);
+
+ } else {
+ seq_printf(m, " %-2.2s %-10.10s\n",
+ tmp_id,
+ ND_STATE_STR(nd->nd_state));
+ }
+
+ return 0;
+}
+
+
+static const struct seq_operations nodeinfo_ops = {
+ .start = dgrp_nodeinfo_start,
+ .next = dgrp_nodeinfo_next,
+ .stop = dgrp_nodeinfo_stop,
+ .show = dgrp_nodeinfo_show,
+};
+
+static int dgrp_nodeinfo_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &nodeinfo_ops);
+}
+
+/**
+ * dgrp_add_id() -- creates new nd struct and adds it to list
+ * @id: id of device to add
+ */
+static int dgrp_add_id(long id)
+{
+ struct nd_struct *nd;
+ int ret;
+ int i;
+
+ nd = kzalloc(sizeof(struct nd_struct), GFP_KERNEL);
+ if (!nd)
+ return -ENOMEM;
+
+ nd->nd_major = 0;
+ nd->nd_ID = id;
+
+ spin_lock_init(&nd->nd_lock);
+
+ init_waitqueue_head(&nd->nd_tx_waitq);
+ init_waitqueue_head(&nd->nd_mon_wqueue);
+ init_waitqueue_head(&nd->nd_dpa_wqueue);
+ sema_init(&nd->nd_mon_semaphore, 1);
+ sema_init(&nd->nd_net_semaphore, 1);
+ spin_lock_init(&nd->nd_dpa_lock);
+ nd->nd_state = NS_CLOSED;
+ for (i = 0; i < SEQ_MAX; i++)
+ init_waitqueue_head(&nd->nd_seq_wque[i]);
+
+ /* setup the structures to get the major number */
+ ret = dgrp_tty_init(nd);
+ if (ret)
+ goto error_out;
+
+ nd->nd_major = nd->nd_serial_ttdriver->major;
+
+ ret = nd_struct_add(nd);
+ if (ret)
+ goto error_out;
+
+ dgrp_create_node_class_sysfs_files(nd);
+ nd->nd_net_de = add_proc_file(nd, net_entry_pointer, &dgrp_net_ops);
+ nd->nd_mon_de = add_proc_file(nd, mon_entry_pointer, &dgrp_mon_ops);
+ nd->nd_dpa_de = add_proc_file(nd, dpa_entry_pointer, &dgrp_dpa_ops);
+ nd->nd_ports_de = add_proc_file(nd, ports_entry_pointer,
+ &dgrp_ports_ops);
+ return 0;
+
+ /* FIXME this guy should free the tty driver stored in nd and destroy
+ * all channel ports */
+error_out:
+ kfree(nd);
+ return ret;
+
+}
+
+static int dgrp_remove_nd(struct nd_struct *nd)
+{
+ int ret;
+
+ /* Check to see if the selected structure is in use */
+ if (nd->nd_tty_ref_cnt)
+ return -EBUSY;
+
+ remove_files(nd);
+
+ dgrp_tty_uninit(nd);
+
+ ret = nd_struct_del(nd);
+ if (ret)
+ return ret;
+
+ kfree(nd);
+ return 0;
+}
+
+static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
+ struct proc_dir_entry *root,
+ const struct file_operations *fops)
+{
+ char buf[3];
+ ID_TO_CHAR(node->nd_ID, buf);
+ return proc_create_data(buf, 0600, root, fops, node);
+}
generated by cgit v1.3.1 (git 2.54.0) at 2026-08-15 14:15:32 +0000