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1da177e4 LT |
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 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/hdpu_features.h> | |
1da177e4 | 21 | |
d052d1be | 22 | #include <linux/platform_device.h> |
d2ceb47a | 23 | #include <asm/io.h> |
1da177e4 | 24 | |
3ae5eaec RK |
25 | static int hdpu_nexus_probe(struct platform_device *pdev); |
26 | static int hdpu_nexus_remove(struct platform_device *pdev); | |
1da177e4 LT |
27 | |
28 | static struct proc_dir_entry *hdpu_slot_id; | |
29 | static struct proc_dir_entry *hdpu_chassis_id; | |
30 | static int slot_id = -1; | |
31 | static int chassis_id = -1; | |
32 | ||
3ae5eaec | 33 | static struct platform_driver hdpu_nexus_driver = { |
1da177e4 LT |
34 | .probe = hdpu_nexus_probe, |
35 | .remove = hdpu_nexus_remove, | |
3ae5eaec RK |
36 | .driver = { |
37 | .name = HDPU_NEXUS_NAME, | |
38 | }, | |
1da177e4 LT |
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 | { | |
1da177e4 LT |
44 | if (offset > 0) |
45 | return 0; | |
a4e32b5f | 46 | |
1da177e4 LT |
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 | { | |
1da177e4 LT |
53 | if (offset > 0) |
54 | return 0; | |
a4e32b5f | 55 | |
1da177e4 LT |
56 | return sprintf(buffer, "%d\n", chassis_id); |
57 | } | |
58 | ||
3ae5eaec | 59 | static int hdpu_nexus_probe(struct platform_device *pdev) |
1da177e4 | 60 | { |
1da177e4 | 61 | struct resource *res; |
a4e32b5f | 62 | int *nexus_id_addr; |
1da177e4 LT |
63 | |
64 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
a4e32b5f CG |
65 | nexus_id_addr = ioremap(res->start, |
66 | (unsigned long)(res->end - res->start)); | |
1da177e4 LT |
67 | if (nexus_id_addr) { |
68 | slot_id = (*nexus_id_addr >> 8) & 0x1f; | |
69 | chassis_id = *nexus_id_addr & 0xff; | |
70 | iounmap(nexus_id_addr); | |
a4e32b5f CG |
71 | } else { |
72 | printk(KERN_ERR "Could not map slot id\n"); | |
73 | } | |
74 | ||
1da177e4 LT |
75 | hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root); |
76 | hdpu_slot_id->read_proc = hdpu_slot_id_read; | |
1da177e4 LT |
77 | |
78 | hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root); | |
79 | hdpu_chassis_id->read_proc = hdpu_chassis_id_read; | |
a4e32b5f | 80 | |
1da177e4 LT |
81 | return 0; |
82 | } | |
83 | ||
3ae5eaec | 84 | static int hdpu_nexus_remove(struct platform_device *pdev) |
1da177e4 LT |
85 | { |
86 | slot_id = -1; | |
87 | chassis_id = -1; | |
a4e32b5f | 88 | |
1da177e4 LT |
89 | remove_proc_entry("sky_slot_id", &proc_root); |
90 | remove_proc_entry("sky_chassis_id", &proc_root); | |
a4e32b5f | 91 | |
1da177e4 LT |
92 | hdpu_slot_id = 0; |
93 | hdpu_chassis_id = 0; | |
a4e32b5f | 94 | |
1da177e4 LT |
95 | return 0; |
96 | } | |
97 | ||
98 | static int __init nexus_init(void) | |
99 | { | |
a4e32b5f | 100 | return platform_driver_register(&hdpu_nexus_driver); |
1da177e4 LT |
101 | } |
102 | ||
103 | static void __exit nexus_exit(void) | |
104 | { | |
3ae5eaec | 105 | platform_driver_unregister(&hdpu_nexus_driver); |
1da177e4 LT |
106 | } |
107 | ||
108 | module_init(nexus_init); | |
109 | module_exit(nexus_exit); | |
110 | ||
111 | MODULE_AUTHOR("Brian Waite"); | |
112 | MODULE_LICENSE("GPL"); |