| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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/version.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/proc_fs.h> |
| 21 | #include <linux/hdpu_features.h> |
| 22 | #include <linux/pci.h> |
| 23 | |
| 24 | #include <linux/device.h> |
| 25 | |
| 26 | static int hdpu_nexus_probe(struct device *ddev); |
| 27 | static int hdpu_nexus_remove(struct device *ddev); |
| 28 | |
| 29 | static struct proc_dir_entry *hdpu_slot_id; |
| 30 | static struct proc_dir_entry *hdpu_chassis_id; |
| 31 | static int slot_id = -1; |
| 32 | static int chassis_id = -1; |
| 33 | |
| 34 | static struct device_driver hdpu_nexus_driver = { |
| 35 | .name = HDPU_NEXUS_NAME, |
| 36 | .bus = &platform_bus_type, |
| 37 | .probe = hdpu_nexus_probe, |
| 38 | .remove = hdpu_nexus_remove, |
| 39 | }; |
| 40 | |
| 41 | int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset, |
| 42 | int buffer_length, int *zero, void *ptr) |
| 43 | { |
| 44 | |
| 45 | if (offset > 0) |
| 46 | return 0; |
| 47 | return sprintf(buffer, "%d\n", slot_id); |
| 48 | } |
| 49 | |
| 50 | int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset, |
| 51 | int buffer_length, int *zero, void *ptr) |
| 52 | { |
| 53 | |
| 54 | if (offset > 0) |
| 55 | return 0; |
| 56 | return sprintf(buffer, "%d\n", chassis_id); |
| 57 | } |
| 58 | |
| 59 | static int hdpu_nexus_probe(struct device *ddev) |
| 60 | { |
| 61 | struct platform_device *pdev = to_platform_device(ddev); |
| 62 | struct resource *res; |
| 63 | |
| 64 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 65 | int *nexus_id_addr; |
| 66 | nexus_id_addr = |
| 67 | ioremap(res->start, (unsigned long)(res->end - res->start)); |
| 68 | if (nexus_id_addr) { |
| 69 | slot_id = (*nexus_id_addr >> 8) & 0x1f; |
| 70 | chassis_id = *nexus_id_addr & 0xff; |
| 71 | iounmap(nexus_id_addr); |
| 72 | } else |
| 73 | printk("Could not map slot id\n"); |
| 74 | hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root); |
| 75 | hdpu_slot_id->read_proc = hdpu_slot_id_read; |
| 76 | hdpu_slot_id->nlink = 1; |
| 77 | |
| 78 | hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root); |
| 79 | hdpu_chassis_id->read_proc = hdpu_chassis_id_read; |
| 80 | hdpu_chassis_id->nlink = 1; |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static int hdpu_nexus_remove(struct device *ddev) |
| 85 | { |
| 86 | slot_id = -1; |
| 87 | chassis_id = -1; |
| 88 | remove_proc_entry("sky_slot_id", &proc_root); |
| 89 | remove_proc_entry("sky_chassis_id", &proc_root); |
| 90 | hdpu_slot_id = 0; |
| 91 | hdpu_chassis_id = 0; |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int __init nexus_init(void) |
| 96 | { |
| 97 | int rc; |
| 98 | rc = driver_register(&hdpu_nexus_driver); |
| 99 | return rc; |
| 100 | } |
| 101 | |
| 102 | static void __exit nexus_exit(void) |
| 103 | { |
| 104 | driver_unregister(&hdpu_nexus_driver); |
| 105 | } |
| 106 | |
| 107 | module_init(nexus_init); |
| 108 | module_exit(nexus_exit); |
| 109 | |
| 110 | MODULE_AUTHOR("Brian Waite"); |
| 111 | MODULE_LICENSE("GPL"); |