- ssize_t pci_write_legacy_io(struct file * filp, struct kobject * kobj, struct bin_attribute * bin_attr, char * buf, loff_t off, size_t count);
- open sysfs file
- kobject corresponding to file to read from
- struct bin_attribute for this file
- buffer containing value to be written
- offset into legacy I/O port space
- number of bytes to write
Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific callback routine (pci_legacy_write).