1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/macintosh/nvram.c b/drivers/macintosh/nvram.c
new file mode 100644
index 000000000..f0e03e793
--- /dev/null
+++ b/drivers/macintosh/nvram.c
@@ -0,0 +1,130 @@
+/*
+ * /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
+
+static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
+{
+	switch (origin) {
+	case 0:
+		break;
+	case 1:
+		offset += file->f_pos;
+		break;
+	case 2:
+		offset += NVRAM_SIZE;
+		break;
+	default:
+		offset = -1;
+	}
+	if (offset < 0)
+		return -EINVAL;
+
+	file->f_pos = offset;
+	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 long nvram_ioctl(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;
+}
+
+const struct file_operations nvram_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= nvram_llseek,
+	.read		= read_nvram,
+	.write		= write_nvram,
+	.unlocked_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");