PCI_WRITE_LEGACY_IO - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Hardware Interfaces

NAMEpci_write_legacy_io − write byte(s) to legacy I/O port space

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

ARGUMENTSfilp open sysfs file kobj kobject corresponding to file to read from bin_attr struct bin_attribute for this file buf buffer containing value to be written off offset into legacy I/O port space count number of bytes to write

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

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