diff options
Diffstat (limited to 'drivers/char/generic_nvram.c')
-rw-r--r-- | drivers/char/generic_nvram.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c deleted file mode 100644 index ff5394f47587..000000000000 --- a/drivers/char/generic_nvram.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * Generic /dev/nvram driver for architectures providing some - * "generic" hooks, that is : - * - * nvram_read_byte, nvram_write_byte, nvram_sync, nvram_get_size - * - * Note that an additional hook is supported for PowerMac only - * for getting the nvram "partition" informations - * - */ - -#define NVRAM_VERSION "1.1" - -#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/init.h> -#include <linux/mutex.h> -#include <linux/pagemap.h> -#include <linux/uaccess.h> -#include <asm/nvram.h> -#ifdef CONFIG_PPC_PMAC -#include <asm/machdep.h> -#endif - -#define NVRAM_SIZE 8192 - -static DEFINE_MUTEX(nvram_mutex); -static ssize_t nvram_len; - -static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) -{ - return generic_file_llseek_size(file, offset, origin, - MAX_LFS_FILESIZE, nvram_len); -} - -static ssize_t read_nvram(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - unsigned int i; - char __user *p = buf; - - if (!access_ok(buf, count)) - return -EFAULT; - if (*ppos >= nvram_len) - return 0; - for (i = *ppos; count > 0 && i < nvram_len; ++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 __user *buf, - size_t count, loff_t *ppos) -{ - unsigned int i; - const char __user *p = buf; - char c; - - if (!access_ok(buf, count)) - return -EFAULT; - if (*ppos >= nvram_len) - return 0; - for (i = *ppos; count > 0 && i < nvram_len; ++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 file *file, unsigned int cmd, unsigned long arg) -{ - switch(cmd) { -#ifdef CONFIG_PPC_PMAC - case OBSOLETE_PMAC_NVRAM_GET_OFFSET: - printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); - case IOC_NVRAM_GET_OFFSET: { - int part, offset; - - if (!machine_is(powermac)) - return -EINVAL; - if (copy_from_user(&part, (void __user*)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 __user*)arg, &offset, sizeof(offset)) != 0) - return -EFAULT; - break; - } -#endif /* CONFIG_PPC_PMAC */ - case IOC_NVRAM_SYNC: - nvram_sync(); - break; - default: - return -EINVAL; - } - - return 0; -} - -static long nvram_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - int ret; - - mutex_lock(&nvram_mutex); - ret = nvram_ioctl(file, cmd, arg); - mutex_unlock(&nvram_mutex); - - return ret; -} - -const struct file_operations nvram_fops = { - .owner = THIS_MODULE, - .llseek = nvram_llseek, - .read = read_nvram, - .write = write_nvram, - .unlocked_ioctl = nvram_unlocked_ioctl, -}; - -static struct miscdevice nvram_dev = { - NVRAM_MINOR, - "nvram", - &nvram_fops -}; - -int __init nvram_init(void) -{ - int ret = 0; - - printk(KERN_INFO "Generic non-volatile memory driver v%s\n", - NVRAM_VERSION); - ret = misc_register(&nvram_dev); - if (ret != 0) - goto out; - - nvram_len = nvram_get_size(); - if (nvram_len < 0) - nvram_len = NVRAM_SIZE; - -out: - return ret; -} - -void __exit nvram_cleanup(void) -{ - misc_deregister( &nvram_dev ); -} - -module_init(nvram_init); -module_exit(nvram_cleanup); -MODULE_LICENSE("GPL"); |