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/*
* /dev/nvram driver for Power Macintosh.
*/
#define NVRAM_VERSION "1.0"
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/fcntl.h>
#include <linux/nvram.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/nvram.h>
#define NVRAM_SIZE 8192
/* when building as a module, __openfirmware is both unavailable
* and unnecessary. */
#ifndef MODULE
__openfirmware
#endif
static long long nvram_llseek(struct file *file, loff_t offset, int origin)
{
switch (origin) {
case 1:
offset += file->f_pos;
break;
case 2:
offset += NVRAM_SIZE;
break;
}
if (offset < 0)
return -EINVAL;
file->f_pos = offset;
return file->f_pos;
}
static ssize_t read_nvram(struct file *file, char *buf,
size_t count, loff_t *ppos)
{
unsigned int i;
char *p = buf;
if (verify_area(VERIFY_WRITE, buf, count))
return -EFAULT;
if (*ppos >= NVRAM_SIZE)
return 0;
for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count)
if (__put_user(nvram_read_byte(i), p))
return -EFAULT;
*ppos = i;
return p - buf;
}
static ssize_t write_nvram(struct file *file, const char *buf,
size_t count, loff_t *ppos)
{
unsigned int i;
const char *p = buf;
char c;
if (verify_area(VERIFY_READ, buf, count))
return -EFAULT;
if (*ppos >= NVRAM_SIZE)
return 0;
for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) {
if (__get_user(c, p))
return -EFAULT;
nvram_write_byte(c, i);
}
*ppos = i;
return p - buf;
}
static int nvram_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
switch(cmd) {
case PMAC_NVRAM_GET_OFFSET:
{
int part, offset;
if (copy_from_user(&part,(void*)arg,sizeof(part))!=0)
return -EFAULT;
if (part < pmac_nvram_OF || part > pmac_nvram_NR)
return -EINVAL;
offset = pmac_get_partition(part);
if (copy_to_user((void*)arg,&offset,sizeof(offset))!=0)
return -EFAULT;
break;
}
default:
return -EINVAL;
}
return 0;
}
static int nvram_open(struct inode *inode, struct file *file)
{
MOD_INC_USE_COUNT;
return 0;
}
static int nvram_release(struct inode *inode, struct file *file)
{
MOD_DEC_USE_COUNT;
return 0;
}
struct file_operations nvram_fops = {
nvram_llseek,
read_nvram,
write_nvram,
NULL, /* nvram_readdir */
NULL, /* nvram_select */
nvram_ioctl,
NULL, /* nvram_mmap */
nvram_open,
NULL, /* flush */
nvram_release,
NULL /* fsync */
};
static struct miscdevice nvram_dev = {
NVRAM_MINOR,
"nvram",
&nvram_fops
};
__initfunc(int nvram_init(void))
{
printk(KERN_INFO "Macintosh non-volatile memory driver v%s\n",
NVRAM_VERSION);
misc_register(&nvram_dev);
return 0;
}
#ifdef MODULE
int init_module (void)
{
return( nvram_init() );
}
void cleanup_module (void)
{
misc_deregister( &nvram_dev );
}
#endif
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