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>
22 #include <linux/platform_device.h>
25 static int hdpu_nexus_probe(struct platform_device *pdev);
26 static int hdpu_nexus_remove(struct platform_device *pdev);
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 platform_driver hdpu_nexus_driver = {
34 .probe = hdpu_nexus_probe,
35 .remove = hdpu_nexus_remove,
37 .name = HDPU_NEXUS_NAME,
41 int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset,
42 int buffer_length, int *zero, void *ptr)
47 return sprintf(buffer, "%d\n", slot_id);
50 int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset,
51 int buffer_length, int *zero, void *ptr)
56 return sprintf(buffer, "%d\n", chassis_id);
59 static int hdpu_nexus_probe(struct platform_device *pdev)
64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66 printk(KERN_ERR "sky_nexus: "
67 "Invalid memory resource.\n");
70 nexus_id_addr = ioremap(res->start,
71 (unsigned long)(res->end - res->start));
73 slot_id = (*nexus_id_addr >> 8) & 0x1f;
74 chassis_id = *nexus_id_addr & 0xff;
75 iounmap(nexus_id_addr);
77 printk(KERN_ERR "sky_nexus: Could not map slot id\n");
80 hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
82 printk(KERN_WARNING "sky_nexus: "
83 "Unable to create proc dir entry: sky_slot_id\n");
85 hdpu_slot_id->read_proc = hdpu_slot_id_read;
88 hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
89 if (!hdpu_chassis_id) {
90 printk(KERN_WARNING "sky_nexus: "
91 "Unable to create proc dir entry: sky_chassis_id\n");
93 hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
99 static int hdpu_nexus_remove(struct platform_device *pdev)
104 remove_proc_entry("sky_slot_id", &proc_root);
105 remove_proc_entry("sky_chassis_id", &proc_root);
113 static int __init nexus_init(void)
115 return platform_driver_register(&hdpu_nexus_driver);
118 static void __exit nexus_exit(void)
120 platform_driver_unregister(&hdpu_nexus_driver);
123 module_init(nexus_init);
124 module_exit(nexus_exit);
126 MODULE_AUTHOR("Brian Waite");
127 MODULE_LICENSE("GPL");