/*
* VMEbus User access driver
*
- * Author: Martyn Welch <martyn.welch@gefanuc.com>
- * Copyright 2008 GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+ * Author: Martyn Welch <martyn.welch@ge.com>
+ * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
*
* Based on work by:
* Tom Armistead and Ajit Prem
static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
{
- printk(KERN_ERR "Llseek currently incomplete\n");
- return -EINVAL;
+ loff_t absolute = -1;
+ unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
+ size_t image_size;
+
+ down(&image[minor].sem);
+ image_size = vme_get_size(image[minor].resource);
+
+ switch (whence) {
+ case SEEK_SET:
+ absolute = off;
+ break;
+ case SEEK_CUR:
+ absolute = file->f_pos + off;
+ break;
+ case SEEK_END:
+ absolute = image_size + off;
+ break;
+ default:
+ up(&image[minor].sem);
+ return -EINVAL;
+ break;
+ }
+
+ if ((absolute < 0) || (absolute >= image_size)) {
+ up(&image[minor].sem);
+ return -EINVAL;
+ }
+
+ file->f_pos = absolute;
+
+ up(&image[minor].sem);
+
+ return absolute;
}
/*
* in future revisions if that ever becomes necessary.
*/
if (bus_num > USER_BUS_MAX) {
- printk(KERN_ERR "%s: Driver only able to handle %d PIO2 "
- "Cards\n", driver_name, USER_BUS_MAX);
+ printk(KERN_ERR "%s: Driver only able to handle %d buses\n",
+ driver_name, USER_BUS_MAX);
bus_num = USER_BUS_MAX;
}
module_param_array(bus, int, &bus_num, 0);
MODULE_DESCRIPTION("VME User Space Access Driver");
-MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
MODULE_LICENSE("GPL");
module_init(vme_user_init);