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/*
* Copyright (c) 2010 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/slab.h>
#include <linux/string.h>
#include <bcmdefs.h>
#include <bcmutils.h>
#include <bcmnvram.h>
#include <sbchipc.h>
#include <bcmdevs.h>
#include <hndsoc.h>
#define NVR_MSG(x)
typedef struct _vars {
struct _vars *next;
int bufsz; /* allocated size */
int size; /* actual vars size */
char *vars;
} vars_t;
#define VARS_T_OH sizeof(vars_t)
static vars_t *vars;
#define NVRAM_FILE 1
static char *findvar(char *vars, char *lim, const char *name);
int nvram_init(void)
{
/* Make sure we read nvram in flash just once before freeing the memory */
if (vars != NULL) {
NVR_MSG(("nvram_init: called again without calling nvram_exit()\n"));
return 0;
}
return 0;
}
int nvram_append(char *varlst, uint varsz)
{
uint bufsz = VARS_T_OH;
vars_t *new;
new = kmalloc(bufsz, GFP_ATOMIC);
if (new == NULL)
return -ENOMEM;
new->vars = varlst;
new->bufsz = bufsz;
new->size = varsz;
new->next = vars;
vars = new;
return 0;
}
void nvram_exit(void)
{
vars_t *this, *next;
this = vars;
if (this)
kfree(this->vars);
while (this) {
next = this->next;
kfree(this);
this = next;
}
vars = NULL;
}
static char *findvar(char *vars, char *lim, const char *name)
{
char *s;
int len;
len = strlen(name);
for (s = vars; (s < lim) && *s;) {
if ((memcmp(s, name, len) == 0) && (s[len] == '='))
return &s[len + 1];
while (*s++)
;
}
return NULL;
}
/*
* Search the name=value vars for a specific one and return its value.
* Returns NULL if not found.
*/
char *getvar(char *vars, const char *name)
{
char *s;
int len;
if (!name)
return NULL;
len = strlen(name);
if (len == 0)
return NULL;
/* first look in vars[] */
for (s = vars; s && *s;) {
if ((memcmp(s, name, len) == 0) && (s[len] == '='))
return &s[len + 1];
while (*s++)
;
}
/* then query nvram */
return nvram_get(name);
}
/*
* Search the vars for a specific one and return its value as
* an integer. Returns 0 if not found.
*/
int getintvar(char *vars, const char *name)
{
char *val;
val = getvar(vars, name);
if (val == NULL)
return 0;
return simple_strtoul(val, NULL, 0);
}
char *nvram_get(const char *name)
{
char *v = NULL;
vars_t *cur;
for (cur = vars; cur; cur = cur->next) {
v = findvar(cur->vars, cur->vars + cur->size, name);
if (v)
break;
}
return v;
}
int nvram_set(const char *name, const char *value)
{
return 0;
}
int nvram_unset(const char *name)
{
return 0;
}
int nvram_reset(void)
{
return 0;
}
int nvram_commit(void)
{
return 0;
}
int nvram_getall(char *buf, int count)
{
int len, resid = count;
vars_t *this;
this = vars;
while (this) {
char *from, *lim, *to;
int acc;
from = this->vars;
lim = (char *)(this->vars + this->size);
to = buf;
acc = 0;
while ((from < lim) && (*from)) {
len = strlen(from) + 1;
if (resid < (acc + len))
return -EOVERFLOW;
memcpy(to, from, len);
acc += len;
from += len;
to += len;
}
resid -= acc;
buf += acc;
this = this->next;
}
if (resid < 1)
return -EOVERFLOW;
*buf = '\0';
return 0;
}
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