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/platform_device.h>
22 #include <linux/seq_file.h>
25 static int hdpu_nexus_probe(struct platform_device *pdev);
26 static int hdpu_nexus_remove(struct platform_device *pdev);
27 static int hdpu_slot_id_open(struct inode *inode, struct file *file);
28 static int hdpu_slot_id_read(struct seq_file *seq, void *offset);
29 static int hdpu_chassis_id_open(struct inode *inode, struct file *file);
30 static int hdpu_chassis_id_read(struct seq_file *seq, void *offset);
32 static struct proc_dir_entry *hdpu_slot_id;
33 static struct proc_dir_entry *hdpu_chassis_id;
34 static int slot_id = -1;
35 static int chassis_id = -1;
37 static const struct file_operations proc_slot_id = {
38 .open = hdpu_slot_id_open,
41 .release = single_release,
45 static const struct file_operations proc_chassis_id = {
46 .open = hdpu_chassis_id_open,
49 .release = single_release,
53 static struct platform_driver hdpu_nexus_driver = {
54 .probe = hdpu_nexus_probe,
55 .remove = hdpu_nexus_remove,
57 .name = HDPU_NEXUS_NAME,
62 static int hdpu_slot_id_open(struct inode *inode, struct file *file)
64 return single_open(file, hdpu_slot_id_read, NULL);
67 static int hdpu_slot_id_read(struct seq_file *seq, void *offset)
69 seq_printf(seq, "%d\n", slot_id);
73 static int hdpu_chassis_id_open(struct inode *inode, struct file *file)
75 return single_open(file, hdpu_chassis_id_read, NULL);
78 static int hdpu_chassis_id_read(struct seq_file *seq, void *offset)
80 seq_printf(seq, "%d\n", chassis_id);
84 static int hdpu_nexus_probe(struct platform_device *pdev)
89 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
91 printk(KERN_ERR "sky_nexus: "
92 "Invalid memory resource.\n");
95 nexus_id_addr = ioremap(res->start,
96 (unsigned long)(res->end - res->start));
98 slot_id = (*nexus_id_addr >> 8) & 0x1f;
99 chassis_id = *nexus_id_addr & 0xff;
100 iounmap(nexus_id_addr);
102 printk(KERN_ERR "sky_nexus: Could not map slot id\n");
105 hdpu_slot_id = proc_create("sky_slot_id", 0666, NULL, &proc_slot_id);
107 printk(KERN_WARNING "sky_nexus: "
108 "Unable to create proc dir entry: sky_slot_id\n");
111 hdpu_chassis_id = proc_create("sky_chassis_id", 0666, NULL,
113 if (!hdpu_chassis_id)
114 printk(KERN_WARNING "sky_nexus: "
115 "Unable to create proc dir entry: sky_chassis_id\n");
121 static int hdpu_nexus_remove(struct platform_device *pdev)
126 remove_proc_entry("sky_slot_id", NULL);
127 remove_proc_entry("sky_chassis_id", NULL);
135 static int __init nexus_init(void)
137 return platform_driver_register(&hdpu_nexus_driver);
140 static void __exit nexus_exit(void)
142 platform_driver_unregister(&hdpu_nexus_driver);
145 module_init(nexus_init);
146 module_exit(nexus_exit);
148 MODULE_AUTHOR("Brian Waite");
149 MODULE_LICENSE("GPL");
150 MODULE_ALIAS("platform:" HDPU_NEXUS_NAME);