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Commit e0c8dbaa authored by Jan-Benedict Glaw's avatar Jan-Benedict Glaw Committed by Linus Torvalds
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[PATCH] Update to srm_env.c driver (for Alpha arch.) 

Hi Linus!

Please apply this patch. It updates the srm_env.c driver (to access
Alpha's SRM environment variables) to its current version (which is
already included in up-to-date 2.4.x kernels).

MfG, JBG
parent ec66b46d
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Showing with 161 additions and 59 deletions
arch/alpha/kernel/srm_env.c
View file @ e0c8dbaa
/*
* 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
......@@ -36,6 +29,24 @@
*
*/
/*
* 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>
......@@ -45,10 +56,11 @@
#include <asm/uaccess.h>
#include <asm/machvec.h>
#define DIRNAME "srm_environment" /* Subdir in /proc/ */
#define VERSION "0.0.2" /* Module version */
#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 */
#define DEBUG
MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface");
......@@ -61,8 +73,12 @@ typedef struct _srm_env {
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 },
......@@ -80,10 +96,11 @@ static srm_env_t srm_entries[] = {
{ "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;
......@@ -108,10 +125,9 @@ static int srm_env_read(char *page, char **start, off_t off, int count,
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;
......@@ -128,7 +144,7 @@ static int srm_env_write(struct file *file, const char *buffer,
return -ENOMEM;
}
//memcpy(aligned_buffer, buffer, nbytes)
/* memcpy(aligned_buffer, buffer, nbytes) */
if(copy_from_user(buf, buffer, count)) {
MOD_DEC_USE_COUNT;
......@@ -150,55 +166,142 @@ static int srm_env_write(struct file *file, const char *buffer,
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;
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, directory);
remove_proc_entry(entry->name,
named_dir);
entry->proc_entry = NULL;
}
entry++;
}
remove_proc_entry(DIRNAME, NULL);
remove_proc_entry(NAMED_DIR, base_dir);
}
/*
* 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;
/*
* 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;
directory->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;
/* Now create all the nodes... */
entry = srm_entries;
/*
* 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;
......@@ -208,9 +311,8 @@ static int __init srm_env_init(void)
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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