pci_read_legacy_io — read byte(s) from legacy I/O port space


ssize_t pci_read_legacy_io (struct file * filp,
 struct kobject * kobj,
 struct bin_attribute * bin_attr,
 char * buf,
 loff_t off,
 size_t count);


struct file * filp

open sysfs file

struct kobject * kobj

kobject corresponding to file to read from

struct bin_attribute * bin_attr

struct bin_attribute for this file

char * buf

buffer to store results

loff_t off

offset into legacy I/O port space

size_t count

number of bytes to read


Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific callback routine (pci_legacy_read).