2 * Sky Nexus Register Driver
4 * Copyright (C) 2002 Brian Waite
6 * This driver allows reading the Nexus register
7 * It exports the /proc/sky_chassis_id and also
8 * /proc/sky_slot_id pseudo-file for status information.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/proc_fs.h>
20 #include <linux/hdpu_features.h>
21 #include <linux/pci.h>
23 #include <linux/platform_device.h>
25 static int hdpu_nexus_probe(struct device *ddev);
26 static int hdpu_nexus_remove(struct device *ddev);
28 static struct proc_dir_entry *hdpu_slot_id;
29 static struct proc_dir_entry *hdpu_chassis_id;
30 static int slot_id = -1;
31 static int chassis_id = -1;
33 static struct device_driver hdpu_nexus_driver = {
34 .name = HDPU_NEXUS_NAME,
35 .bus = &platform_bus_type,
36 .probe = hdpu_nexus_probe,
37 .remove = hdpu_nexus_remove,
40 int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset,
41 int buffer_length, int *zero, void *ptr)
46 return sprintf(buffer, "%d\n", slot_id);
49 int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset,
50 int buffer_length, int *zero, void *ptr)
55 return sprintf(buffer, "%d\n", chassis_id);
58 static int hdpu_nexus_probe(struct device *ddev)
60 struct platform_device *pdev = to_platform_device(ddev);
63 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66 ioremap(res->start, (unsigned long)(res->end - res->start));
68 slot_id = (*nexus_id_addr >> 8) & 0x1f;
69 chassis_id = *nexus_id_addr & 0xff;
70 iounmap(nexus_id_addr);
72 printk("Could not map slot id\n");
73 hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
74 hdpu_slot_id->read_proc = hdpu_slot_id_read;
75 hdpu_slot_id->nlink = 1;
77 hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
78 hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
79 hdpu_chassis_id->nlink = 1;
83 static int hdpu_nexus_remove(struct device *ddev)
87 remove_proc_entry("sky_slot_id", &proc_root);
88 remove_proc_entry("sky_chassis_id", &proc_root);
94 static int __init nexus_init(void)
97 rc = driver_register(&hdpu_nexus_driver);
101 static void __exit nexus_exit(void)
103 driver_unregister(&hdpu_nexus_driver);
106 module_init(nexus_init);
107 module_exit(nexus_exit);
109 MODULE_AUTHOR("Brian Waite");
110 MODULE_LICENSE("GPL");