patch-2.4.20 linux-2.4.20/drivers/gsc/eisa_eeprom.c

• Lines: 108
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/drivers/gsc/eisa_eeprom.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/drivers/gsc/eisa_eeprom.c linux-2.4.20/drivers/gsc/eisa_eeprom.c
@@ -0,0 +1,107 @@
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <asm/gsc.h>
+#include <asm/uaccess.h>
+#include <asm/eisa_eeprom.h>
+
+#define 	EISA_EEPROM_MINOR 241
+
+static unsigned long eeprom_addr;
+
+static long long eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
+{
+	switch (origin) {
+	  case 0:
+		/* nothing to do */
+		break;
+	  case 1:
+		offset += file->f_pos;
+		break;
+	  case 2:
+		offset += HPEE_MAX_LENGTH;
+		break;
+	}
+	return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
+}
+
+static ssize_t eisa_eeprom_read(struct file * file,
+			      char *buf, size_t count, loff_t *ppos )
+{
+	unsigned char *tmp;
+	ssize_t ret;
+	int i;
+	
+	if (*ppos >= HPEE_MAX_LENGTH)
+		return 0;
+	
+	count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
+	tmp = kmalloc(count, GFP_KERNEL);
+	if (tmp) {
+		for (i = 0; i < count; i++)
+			tmp[i] = gsc_readb(eeprom_addr+(*ppos)++);
+
+		if (copy_to_user (buf, tmp, count))
+			ret = -EFAULT;
+		else
+			ret = count;
+		kfree (tmp);
+	} else
+		ret = -ENOMEM;
+	
+	return ret;
+}
+
+static int eisa_eeprom_ioctl(struct inode *inode, struct file *file, 
+			   unsigned int cmd,
+			   unsigned long arg)
+{
+	return -ENOTTY;
+}
+
+static int eisa_eeprom_open(struct inode *inode, struct file *file)
+{
+	if (file->f_mode & 2 || eeprom_addr == 0)
+		return -EINVAL;
+   
+	return 0;
+}
+
+static int eisa_eeprom_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+/*
+ *	The various file operations we support.
+ */
+static struct file_operations eisa_eeprom_fops = {
+	owner:		THIS_MODULE,
+	llseek:		eisa_eeprom_llseek,
+	read:		eisa_eeprom_read,
+	ioctl:		eisa_eeprom_ioctl,
+	open:		eisa_eeprom_open,
+	release:	eisa_eeprom_release,
+};
+
+static struct miscdevice eisa_eeprom_dev=
+{
+	EISA_EEPROM_MINOR,
+	"eisa eeprom",
+	&eisa_eeprom_fops
+};
+
+int __init eisa_eeprom_init(unsigned long addr)
+{
+	if (addr) {
+		eeprom_addr = addr;
+		misc_register(&eisa_eeprom_dev);
+		printk(KERN_INFO "EISA EEPROM at 0x%lx\n", eeprom_addr);
+	}
+	return 0;
+}
+
+MODULE_LICENSE("GPL");