/*
* Sky Nexus Register Driver
*
* Copyright (C) 2002 Brian Waite
*
* This driver allows reading the Nexus register
* It exports the /proc/sky_chassis_id and also
* /proc/sky_slot_id pseudo-file for status information.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/hdpu_features.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
static int hdpu_nexus_probe(struct device *ddev);
static int hdpu_nexus_remove(struct device *ddev);
static struct proc_dir_entry *hdpu_slot_id;
static struct proc_dir_entry *hdpu_chassis_id;
static int slot_id = -1;
static int chassis_id = -1;
static struct device_driver hdpu_nexus_driver = {
.name = HDPU_NEXUS_NAME,
.bus = &platform_bus_type,
.probe = hdpu_nexus_probe,
.remove = hdpu_nexus_remove,
};
int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset,
int buffer_length, int *zero, void *ptr)
{
if (offset > 0)
return 0;
return sprintf(buffer, "%d\n", slot_id);
}
int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset,
int buffer_length, int *zero, void *ptr)
{
if (offset > 0)
return 0;
return sprintf(buffer, "%d\n", chassis_id);
}
static int hdpu_nexus_probe(struct device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev);
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int *nexus_id_addr;
nexus_id_addr =
ioremap(res->start, (unsigned long)(res->end - res->start));
if (nexus_id_addr) {
slot_id = (*nexus_id_addr >> 8) & 0x1f;
chassis_id = *nexus_id_addr & 0xff;
iounmap(nexus_id_addr);
} else
printk("Could not map slot id\n");
hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
hdpu_slot_id->read_proc = hdpu_slot_id_read;
hdpu_slot_id->nlink = 1;
hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
hdpu_chassis_id->nlink = 1;
return 0;
}
static int hdpu_nexus_remove(struct device *ddev)
{
slot_id = -1;
chassis_id = -1;
remove_proc_entry("sky_slot_id", &proc_root);
remove_proc_entry("sky_chassis_id", &proc_root);
hdpu_slot_id = 0;
hdpu_chassis_id = 0;
return 0;
}
static int __init nexus_init(void)
{
int rc;
rc = driver_register(&hdpu_nexus_driver);
return rc;
}
static void __exit nexus_exit(void)
{
driver_unregister(&hdpu_nexus_driver);
}
module_init(nexus_init);
module_exit(nexus_exit);
MODULE_AUTHOR("Brian Waite");
MODULE_LICENSE("GPL");
