1 files changed, 131 insertions, 0 deletions

diff --git a/drivers/macintosh/nvram.c b/drivers/macintosh/nvram.c
new file mode 100644
index 000000000000..30791875fc97
--- /dev/null
+++ b/drivers/macintosh/nvram.c
@@ -0,0 +1,131 @@
+/*
+ * /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 <linux/smp_lock.h>
+#include <asm/uaccess.h>
+#include <asm/nvram.h>
+
+#define NVRAM_SIZE      8192
+
+static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
+{
+        lock_kernel();
+        switch (origin) {
+        case 1:
+                offset += file->f_pos;
+                break;
+        case 2:
+                offset += NVRAM_SIZE;
+                break;
+        }
+        if (offset < 0) {
+                unlock_kernel();
+                return -EINVAL;
+        }
+        file->f_pos = offset;
+        unlock_kernel();
+        return file->f_pos;
+}
+
+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(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 __user *buf,
+                           size_t count, loff_t *ppos)
+{
+        unsigned int i;
+        const char __user *p = buf;
+        char c;
+
+        if (!access_ok(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 __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;
+                }
+
+                default:
+                        return -EINVAL;
+        }
+
+        return 0;
+}
+
+struct file_operations nvram_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = nvram_llseek,
+        .read           = read_nvram,
+        .write          = write_nvram,
+        .ioctl          = nvram_ioctl,
+};
+
+static struct miscdevice nvram_dev = {
+        NVRAM_MINOR,
+        "nvram",
+        &nvram_fops
+};
+
+int __init nvram_init(void)
+{
+        printk(KERN_INFO "Macintosh non-volatile memory driver v%s\n",
+                NVRAM_VERSION);
+        return misc_register(&nvram_dev);
+}
+
+void __exit nvram_cleanup(void)
+{
+        misc_deregister( &nvram_dev );
+}
+
+module_init(nvram_init);
+module_exit(nvram_cleanup);
+MODULE_LICENSE("GPL");