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 22#include <linux/platform_device.h> 23 24static int hdpu_nexus_probe(struct platform_device *pdev); 25static int hdpu_nexus_remove(struct platform_device *pdev); 26 27static struct proc_dir_entry *hdpu_slot_id; 28static struct proc_dir_entry *hdpu_chassis_id; 29static int slot_id = -1; 30static int chassis_id = -1; 31 32static struct platform_driver hdpu_nexus_driver = { 33 .probe = hdpu_nexus_probe, 34 .remove = hdpu_nexus_remove, 35 .driver = { 36 .name = HDPU_NEXUS_NAME, 37 }, 38}; 39 40int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset, 41 int buffer_length, int *zero, void *ptr) 42{ 43 44 if (offset > 0) 45 return 0; 46 return sprintf(buffer, "%d\n", slot_id); 47} 48 49int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset, 50 int buffer_length, int *zero, void *ptr) 51{ 52 53 if (offset > 0) 54 return 0; 55 return sprintf(buffer, "%d\n", chassis_id); 56} 57 58static int hdpu_nexus_probe(struct platform_device *pdev) 59{ 60 struct resource *res; 61 62 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 63 int *nexus_id_addr; 64 nexus_id_addr = 65 ioremap(res->start, (unsigned long)(res->end - res->start)); 66 if (nexus_id_addr) { 67 slot_id = (*nexus_id_addr >> 8) & 0x1f; 68 chassis_id = *nexus_id_addr & 0xff; 69 iounmap(nexus_id_addr); 70 } else 71 printk("Could not map slot id\n"); 72 hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root); 73 hdpu_slot_id->read_proc = hdpu_slot_id_read; 74 75 hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root); 76 hdpu_chassis_id->read_proc = hdpu_chassis_id_read; 77 return 0; 78} 79 80static int hdpu_nexus_remove(struct platform_device *pdev) 81{ 82 slot_id = -1; 83 chassis_id = -1; 84 remove_proc_entry("sky_slot_id", &proc_root); 85 remove_proc_entry("sky_chassis_id", &proc_root); 86 hdpu_slot_id = 0; 87 hdpu_chassis_id = 0; 88 return 0; 89} 90 91static int __init nexus_init(void) 92{ 93 int rc; 94 rc = platform_driver_register(&hdpu_nexus_driver); 95 return rc; 96} 97 98static void __exit nexus_exit(void) 99{ 100 platform_driver_unregister(&hdpu_nexus_driver); 101} 102 103module_init(nexus_init); 104module_exit(nexus_exit); 105 106MODULE_AUTHOR("Brian Waite"); 107MODULE_LICENSE("GPL"); 108