108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* 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/platform_device.h>
|
|
|
|
static int hdpu_nexus_probe(struct platform_device *pdev);
|
|
static int hdpu_nexus_remove(struct platform_device *pdev);
|
|
|
|
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 platform_driver hdpu_nexus_driver = {
|
|
.probe = hdpu_nexus_probe,
|
|
.remove = hdpu_nexus_remove,
|
|
.driver = {
|
|
.name = HDPU_NEXUS_NAME,
|
|
},
|
|
};
|
|
|
|
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 platform_device *pdev)
|
|
{
|
|
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_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
|
|
hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
|
|
return 0;
|
|
}
|
|
|
|
static int hdpu_nexus_remove(struct platform_device *pdev)
|
|
{
|
|
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 = platform_driver_register(&hdpu_nexus_driver);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit nexus_exit(void)
|
|
{
|
|
platform_driver_unregister(&hdpu_nexus_driver);
|
|
}
|
|
|
|
module_init(nexus_init);
|
|
module_exit(nexus_exit);
|
|
|
|
MODULE_AUTHOR("Brian Waite");
|
|
MODULE_LICENSE("GPL");
|