patch-2.1.51 linux/drivers/macintosh/nvram.c

• Lines: 88
• Date: Sat Aug 16 09:53:08 1997
• Orig file: v2.1.50/linux/drivers/macintosh/nvram.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.50/linux/drivers/macintosh/nvram.c linux/drivers/macintosh/nvram.c
@@ -0,0 +1,87 @@
+/*
+ * /dev/nvram driver for Power Macintosh.
+ */
+#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>
+
+#define NVRAM_SIZE	8192
+
+static long long nvram_llseek(struct inode *inode, 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 long read_nvram(struct inode *inode, struct file *file,
+	char *buf, unsigned long count)
+{
+	unsigned int i = file->f_pos;
+	char *p = buf;
+
+	for (; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count)
+		put_user(nvram_read_byte(i), p);
+	file->f_pos = i;
+	return p - buf;
+}
+
+static long write_nvram(struct inode *inode, struct file *file,
+	const char *buf, unsigned long count)
+{
+	unsigned int i = file->f_pos;
+	const char *p = buf;
+	char c;
+
+	for (; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) {
+		get_user(c, p);
+		nvram_write_byte(i, c);
+	}
+	file->f_pos = i;
+	return p - buf;
+}
+
+static int nvram_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+struct file_operations nvram_fops = {
+	nvram_llseek,
+	read_nvram,
+	write_nvram,
+	NULL,		/* nvram_readdir */
+	NULL,		/* nvram_select */
+	NULL,		/* nvram_ioctl */
+	NULL,		/* nvram_mmap */
+	nvram_open,
+	NULL,		/* no special release code */
+	NULL		/* fsync */
+};
+
+static struct miscdevice nvram_dev = {
+	NVRAM_MINOR,
+	"nvram",
+	&nvram_fops
+};
+
+__initfunc(int nvram_init(void))
+{
+	misc_register(&nvram_dev);
+	return 0;
+}