/*
- * srm_env.c - Access to SRC environment variables through
- * the linux procfs
+ * srm_env.c - Access to SRM environment
+ * variables through linux' procfs
*
- * (C)2001, Jan-Benedict Glaw <jbglaw@lug-owl.de>
+ * Copyright (C) 2001-2002 Jan-Benedict Glaw <jbglaw@lug-owl.de>
*
* This driver is at all a modified version of Erik Mouw's
- * ./linux/Documentation/DocBook/procfs_example.c, so: thanky
+ * ./linux/Documentation/DocBook/procfs_example.c, so: thank
* you, Erik! He can be reached via email at
* <J.A.K.Mouw@its.tudelft.nl>. It is based on an idea
- * provided by DEC^WCompaq's "Jumpstart" CD. They included
- * a patch like this as well. Thanks for idea!
- *
- *
- * This software has been developed while working on the LART
- * computing board (http://www.lart.tudelft.nl/). The
- * development has been sponsored by the Mobile Multi-media
- * Communications (http://www.mmc.tudelft.nl/) and Ubiquitous
- * Communications (http://www.ubicom.tudelft.nl/) projects.
+ * provided by DEC^WCompaq^WIntel's "Jumpstart" CD. They
+ * included a patch like this as well. Thanks for idea!
*
* 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 version 2.
+ * Public License version 2 as published by the Free Software
+ * Foundation.
*
* This program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied
*
*/
+/*
+ * Changelog
+ * ~~~~~~~~~
+ *
+ * Wed, 22 May 2002 00:11:21 +0200
+ * - Fix typo on comment (SRC -> SRM)
+ * - Call this "Version 0.0.4"
+ *
+ * Tue, 9 Apr 2002 18:44:40 +0200
+ * - Implement access by variable name and additionally
+ * by number. This is done by creating two subdirectories
+ * where one holds all names (like the old directory
+ * did) and the other holding 256 files named like "0",
+ * "1" and so on.
+ * - Call this "Version 0.0.3"
+ *
+ */
+
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/machvec.h>
-#define DIRNAME "srm_environment" /* Subdir in /proc/ */
-#define VERSION "0.0.2" /* Module version */
-#define NAME "srm_env" /* Module name */
-#define DEBUG
+#define BASE_DIR "srm_environment" /* Subdir in /proc/ */
+#define NAMED_DIR "named_variables" /* Subdir for known variables */
+#define NUMBERED_DIR "numbered_variables" /* Subdir for all variables */
+#define VERSION "0.0.4" /* Module version */
+#define NAME "srm_env" /* Module name */
MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface");
struct proc_dir_entry *proc_entry;
} srm_env_t;
-static struct proc_dir_entry *directory;
-static srm_env_t srm_entries[] = {
+static struct proc_dir_entry *base_dir;
+static struct proc_dir_entry *named_dir;
+static struct proc_dir_entry *numbered_dir;
+static char number[256][4];
+
+static srm_env_t srm_named_entries[] = {
{ "auto_action", ENV_AUTO_ACTION },
{ "boot_dev", ENV_BOOT_DEV },
{ "bootdef_dev", ENV_BOOTDEF_DEV },
{ "tty_dev", ENV_TTY_DEV },
{ NULL, 0 },
};
+static srm_env_t srm_numbered_entries[256];
-static int srm_env_read(char *page, char **start, off_t off, int count,
- int *eof, void *data)
-{
+static int
+srm_env_read(char *page, char **start, off_t off, int count, int *eof,
+ void *data) {
int nbytes;
unsigned long ret;
srm_env_t *entry;
return nbytes;
}
-
-static int srm_env_write(struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
+static int
+srm_env_write(struct file *file, const char *buffer, unsigned long count,
+ void *data) {
#define BUFLEN 512
int nbytes;
srm_env_t *entry;
MOD_DEC_USE_COUNT;
return -ENOMEM;
}
-
- //memcpy(aligned_buffer, buffer, nbytes)
+
+ /* memcpy(aligned_buffer, buffer, nbytes) */
if(copy_from_user(buf, buffer, count)) {
MOD_DEC_USE_COUNT;
return nbytes;
}
-static void srm_env_cleanup(void)
-{
+static void
+srm_env_cleanup(void) {
srm_env_t *entry;
+ unsigned long var_num;
- if(directory) {
- entry = srm_entries;
- while(entry->name != NULL && entry->id != 0) {
- if(entry->proc_entry) {
- remove_proc_entry(entry->name, directory);
- entry->proc_entry = NULL;
+ if(base_dir) {
+ /*
+ * Remove named entries
+ */
+ if(named_dir) {
+ entry = srm_named_entries;
+ while(entry->name != NULL && entry->id != 0) {
+ if(entry->proc_entry) {
+ remove_proc_entry(entry->name,
+ named_dir);
+ entry->proc_entry = NULL;
+ }
+ entry++;
}
- entry++;
+ remove_proc_entry(NAMED_DIR, base_dir);
}
- remove_proc_entry(DIRNAME, NULL);
+
+ /*
+ * Remove numbered entries
+ */
+ if(numbered_dir) {
+ for(var_num = 0; var_num <= 255; var_num++) {
+ entry = &srm_numbered_entries[var_num];
+
+ if(entry->proc_entry) {
+ remove_proc_entry(entry->name,
+ numbered_dir);
+ entry->proc_entry = NULL;
+ entry->name = NULL;
+ }
+ }
+ remove_proc_entry(NUMBERED_DIR, base_dir);
+ }
+
+ remove_proc_entry(BASE_DIR, NULL);
}
return;
}
-static int __init srm_env_init(void)
-{
+static int __init
+srm_env_init(void) {
srm_env_t *entry;
-
+ unsigned long var_num;
+
+ /*
+ * Check system
+ */
if(!alpha_using_srm) {
printk(KERN_INFO "%s: This Alpha system doesn't "
"know about SRM...\n", __FUNCTION__);
return -ENODEV;
}
- directory = proc_mkdir(DIRNAME, NULL);
- if(directory == NULL)
- return -ENOMEM;
-
- directory->owner = THIS_MODULE;
-
- /* Now create all the nodes... */
- entry = srm_entries;
+ /*
+ * Init numbers
+ */
+ for(var_num = 0; var_num <= 255; var_num++)
+ sprintf(number[var_num], "%ld", var_num);
+
+ /*
+ * Create base directory
+ */
+ base_dir = proc_mkdir(BASE_DIR, NULL);
+ if(base_dir == NULL) {
+ printk(KERN_ERR "Couldn't create base dir /proc/%s\n",
+ BASE_DIR);
+ goto cleanup;
+ }
+ base_dir->owner = THIS_MODULE;
+
+ /*
+ * Create per-name subdirectory
+ */
+ named_dir = proc_mkdir(NAMED_DIR, base_dir);
+ if(named_dir == NULL) {
+ printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
+ BASE_DIR, NAMED_DIR);
+ goto cleanup;
+ }
+ named_dir->owner = THIS_MODULE;
+
+ /*
+ * Create per-number subdirectory
+ */
+ numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir);
+ if(numbered_dir == NULL) {
+ printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
+ BASE_DIR, NUMBERED_DIR);
+ goto cleanup;
+
+ }
+ numbered_dir->owner = THIS_MODULE;
+
+ /*
+ * Create all named nodes
+ */
+ entry = srm_named_entries;
while(entry->name != NULL && entry->id != 0) {
- entry->proc_entry = create_proc_entry(entry->name, 0644,
- directory);
+ entry->proc_entry = create_proc_entry(entry->name,
+ 0644, named_dir);
if(entry->proc_entry == NULL)
goto cleanup;
- entry->proc_entry->data = entry;
+
+ entry->proc_entry->data = (void *)entry;
+ entry->proc_entry->owner = THIS_MODULE;
entry->proc_entry->read_proc = srm_env_read;
entry->proc_entry->write_proc = srm_env_write;
- entry->proc_entry->owner = THIS_MODULE;
+
entry++;
}
-
+
+ /*
+ * Create all numbered nodes
+ */
+ for(var_num = 0; var_num <= 255; var_num++) {
+ entry = &srm_numbered_entries[var_num];
+ entry->name = number[var_num];
+
+ entry->proc_entry = create_proc_entry(entry->name,
+ 0644, numbered_dir);
+ if(entry->proc_entry == NULL)
+ goto cleanup;
+
+ entry->id = var_num;
+ entry->proc_entry->data = (void *)entry;
+ entry->proc_entry->owner = THIS_MODULE;
+ entry->proc_entry->read_proc = srm_env_read;
+ entry->proc_entry->write_proc = srm_env_write;
+ }
+
printk(KERN_INFO "%s: version %s loaded successfully\n", NAME,
VERSION);
return 0;
return -ENOMEM;
}
-
-static void __exit srm_env_exit(void)
-{
+static void __exit
+srm_env_exit(void) {
srm_env_cleanup();
printk(KERN_INFO "%s: unloaded successfully\n", NAME);
return;
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