LXR linux/drivers/misc/hdpuftrs/hdpu

   1/*
   2 *      Sky Nexus Register Driver
   3 *
   4 *      Copyright (C) 2002 Brian Waite
   5 *
   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.
   9 *
  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.
  14 *
  15 */
  16
  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>
  23#include <asm/io.h>
  24
  25static int hdpu_nexus_probe(struct platform_device *pdev);
  26static int hdpu_nexus_remove(struct platform_device *pdev);
  27static int hdpu_slot_id_open(struct inode *inode, struct file *file);
  28static int hdpu_slot_id_read(struct seq_file *seq, void *offset);
  29static int hdpu_chassis_id_open(struct inode *inode, struct file *file);
  30static int hdpu_chassis_id_read(struct seq_file *seq, void *offset);
  31
  32static struct proc_dir_entry *hdpu_slot_id;
  33static struct proc_dir_entry *hdpu_chassis_id;
  34static int slot_id = -1;
  35static int chassis_id = -1;
  36
  37static const struct file_operations proc_slot_id = {
  38        .open = hdpu_slot_id_open,
  39        .read = seq_read,
  40        .llseek = seq_lseek,
  41        .release = single_release,
  42        .owner = THIS_MODULE,
  43};
  44
  45static const struct file_operations proc_chassis_id = {
  46        .open = hdpu_chassis_id_open,
  47        .read = seq_read,
  48        .llseek = seq_lseek,
  49        .release = single_release,
  50        .owner = THIS_MODULE,
  51};
  52
  53static struct platform_driver hdpu_nexus_driver = {
  54        .probe = hdpu_nexus_probe,
  55        .remove = hdpu_nexus_remove,
  56        .driver = {
  57                .name = HDPU_NEXUS_NAME,
  58                .owner = THIS_MODULE,
  59        },
  60};
  61
  62static int hdpu_slot_id_open(struct inode *inode, struct file *file)
  63{
  64        return single_open(file, hdpu_slot_id_read, NULL);
  65}
  66
  67static int hdpu_slot_id_read(struct seq_file *seq, void *offset)
  68{
  69        seq_printf(seq, "%d\n", slot_id);
  70        return 0;
  71}
  72
  73static int hdpu_chassis_id_open(struct inode *inode, struct file *file)
  74{
  75        return single_open(file, hdpu_chassis_id_read, NULL);
  76}
  77
  78static int hdpu_chassis_id_read(struct seq_file *seq, void *offset)
  79{
  80        seq_printf(seq, "%d\n", chassis_id);
  81        return 0;
  82}
  83
  84static int hdpu_nexus_probe(struct platform_device *pdev)
  85{
  86        struct resource *res;
  87        int *nexus_id_addr;
  88
  89        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  90        if (!res) {
  91                printk(KERN_ERR "sky_nexus: "
  92                       "Invalid memory resource.\n");
  93                return -EINVAL;
  94        }
  95        nexus_id_addr = ioremap(res->start,
  96                                (unsigned long)(res->end - res->start));
  97        if (nexus_id_addr) {
  98                slot_id = (*nexus_id_addr >> 8) & 0x1f;
  99                chassis_id = *nexus_id_addr & 0xff;
 100                iounmap(nexus_id_addr);
 101        } else {
 102                printk(KERN_ERR "sky_nexus: Could not map slot id\n");
 103        }
 104
 105        hdpu_slot_id = proc_create("sky_slot_id", 0666, NULL, &proc_slot_id);
 106        if (!hdpu_slot_id) {
 107                printk(KERN_WARNING "sky_nexus: "
 108                       "Unable to create proc dir entry: sky_slot_id\n");
 109        }
 110
 111        hdpu_chassis_id = proc_create("sky_chassis_id", 0666, NULL,
 112                                      &proc_chassis_id);
 113        if (!hdpu_chassis_id)
 114                printk(KERN_WARNING "sky_nexus: "
 115                       "Unable to create proc dir entry: sky_chassis_id\n");
 116
 117        return 0;
 118}
 119
 120static int hdpu_nexus_remove(struct platform_device *pdev)
 121{
 122        slot_id = -1;
 123        chassis_id = -1;
 124
 125        remove_proc_entry("sky_slot_id", NULL);
 126        remove_proc_entry("sky_chassis_id", NULL);
 127
 128        hdpu_slot_id = 0;
 129        hdpu_chassis_id = 0;
 130
 131        return 0;
 132}
 133
 134static int __init nexus_init(void)
 135{
 136        return platform_driver_register(&hdpu_nexus_driver);
 137}
 138
 139static void __exit nexus_exit(void)
 140{
 141        platform_driver_unregister(&hdpu_nexus_driver);
 142}
 143
 144module_init(nexus_init);
 145module_exit(nexus_exit);
 146
 147MODULE_AUTHOR("Brian Waite");
 148MODULE_LICENSE("GPL");
 149MODULE_ALIAS("platform:" HDPU_NEXUS_NAME);
 150