| /* |
| * Sky Nexus Register Driver |
| * |
| * Copyright (C) 2002 Brian Waite |
| * |
| * This driver allows reading the Nexus register |
| * It exports the /proc/sky_chassis_id and also |
| * /proc/sky_slot_id pseudo-file for status information. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/proc_fs.h> |
| #include <linux/hdpu_features.h> |
| |
| #include <linux/platform_device.h> |
| |
| static int hdpu_nexus_probe(struct platform_device *pdev); |
| static int hdpu_nexus_remove(struct platform_device *pdev); |
| |
| static struct proc_dir_entry *hdpu_slot_id; |
| static struct proc_dir_entry *hdpu_chassis_id; |
| static int slot_id = -1; |
| static int chassis_id = -1; |
| |
| static struct platform_driver hdpu_nexus_driver = { |
| .probe = hdpu_nexus_probe, |
| .remove = hdpu_nexus_remove, |
| .driver = { |
| .name = HDPU_NEXUS_NAME, |
| }, |
| }; |
| |
| int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset, |
| int buffer_length, int *zero, void *ptr) |
| { |
| if (offset > 0) |
| return 0; |
| |
| return sprintf(buffer, "%d\n", slot_id); |
| } |
| |
| int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset, |
| int buffer_length, int *zero, void *ptr) |
| { |
| if (offset > 0) |
| return 0; |
| |
| return sprintf(buffer, "%d\n", chassis_id); |
| } |
| |
| static int hdpu_nexus_probe(struct platform_device *pdev) |
| { |
| struct resource *res; |
| int *nexus_id_addr; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| nexus_id_addr = ioremap(res->start, |
| (unsigned long)(res->end - res->start)); |
| if (nexus_id_addr) { |
| slot_id = (*nexus_id_addr >> 8) & 0x1f; |
| chassis_id = *nexus_id_addr & 0xff; |
| iounmap(nexus_id_addr); |
| } else { |
| printk(KERN_ERR "Could not map slot id\n"); |
| } |
| |
| hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root); |
| hdpu_slot_id->read_proc = hdpu_slot_id_read; |
| |
| hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root); |
| hdpu_chassis_id->read_proc = hdpu_chassis_id_read; |
| |
| return 0; |
| } |
| |
| static int hdpu_nexus_remove(struct platform_device *pdev) |
| { |
| slot_id = -1; |
| chassis_id = -1; |
| |
| remove_proc_entry("sky_slot_id", &proc_root); |
| remove_proc_entry("sky_chassis_id", &proc_root); |
| |
| hdpu_slot_id = 0; |
| hdpu_chassis_id = 0; |
| |
| return 0; |
| } |
| |
| static int __init nexus_init(void) |
| { |
| return platform_driver_register(&hdpu_nexus_driver); |
| } |
| |
| static void __exit nexus_exit(void) |
| { |
| platform_driver_unregister(&hdpu_nexus_driver); |
| } |
| |
| module_init(nexus_init); |
| module_exit(nexus_exit); |
| |
| MODULE_AUTHOR("Brian Waite"); |
| MODULE_LICENSE("GPL"); |