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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> | |
d052d1be | 21 | #include <linux/platform_device.h> |
3049ea7e | 22 | #include <linux/seq_file.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); | |
3049ea7e CG |
27 | static int hdpu_slot_id_open(struct inode *inode, struct file *file); |
28 | static int hdpu_slot_id_read(struct seq_file *seq, void *offset); | |
29 | static int hdpu_chassis_id_open(struct inode *inode, struct file *file); | |
30 | static int hdpu_chassis_id_read(struct seq_file *seq, void *offset); | |
1da177e4 LT |
31 | |
32 | static struct proc_dir_entry *hdpu_slot_id; | |
33 | static struct proc_dir_entry *hdpu_chassis_id; | |
34 | static int slot_id = -1; | |
35 | static int chassis_id = -1; | |
36 | ||
3049ea7e CG |
37 | static 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 | ||
45 | static 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 | ||
3ae5eaec | 53 | static struct platform_driver hdpu_nexus_driver = { |
1da177e4 LT |
54 | .probe = hdpu_nexus_probe, |
55 | .remove = hdpu_nexus_remove, | |
3ae5eaec RK |
56 | .driver = { |
57 | .name = HDPU_NEXUS_NAME, | |
d6c23850 | 58 | .owner = THIS_MODULE, |
3ae5eaec | 59 | }, |
1da177e4 LT |
60 | }; |
61 | ||
3049ea7e | 62 | static int hdpu_slot_id_open(struct inode *inode, struct file *file) |
1da177e4 | 63 | { |
3049ea7e CG |
64 | return single_open(file, hdpu_slot_id_read, NULL); |
65 | } | |
a4e32b5f | 66 | |
3049ea7e CG |
67 | static int hdpu_slot_id_read(struct seq_file *seq, void *offset) |
68 | { | |
69 | seq_printf(seq, "%d\n", slot_id); | |
70 | return 0; | |
1da177e4 LT |
71 | } |
72 | ||
3049ea7e | 73 | static int hdpu_chassis_id_open(struct inode *inode, struct file *file) |
1da177e4 | 74 | { |
3049ea7e CG |
75 | return single_open(file, hdpu_chassis_id_read, NULL); |
76 | } | |
a4e32b5f | 77 | |
3049ea7e CG |
78 | static int hdpu_chassis_id_read(struct seq_file *seq, void *offset) |
79 | { | |
80 | seq_printf(seq, "%d\n", chassis_id); | |
81 | return 0; | |
1da177e4 LT |
82 | } |
83 | ||
3ae5eaec | 84 | static int hdpu_nexus_probe(struct platform_device *pdev) |
1da177e4 | 85 | { |
1da177e4 | 86 | struct resource *res; |
a4e32b5f | 87 | int *nexus_id_addr; |
1da177e4 LT |
88 | |
89 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
7472fd36 CG |
90 | if (!res) { |
91 | printk(KERN_ERR "sky_nexus: " | |
92 | "Invalid memory resource.\n"); | |
93 | return -EINVAL; | |
94 | } | |
a4e32b5f CG |
95 | nexus_id_addr = ioremap(res->start, |
96 | (unsigned long)(res->end - res->start)); | |
1da177e4 LT |
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); | |
a4e32b5f | 101 | } else { |
7472fd36 | 102 | printk(KERN_ERR "sky_nexus: Could not map slot id\n"); |
a4e32b5f CG |
103 | } |
104 | ||
c74c120a AD |
105 | hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, NULL); |
106 | if (!hdpu_slot_id) | |
5f725fe9 CG |
107 | printk(KERN_WARNING "sky_nexus: " |
108 | "Unable to create proc dir entry: sky_slot_id\n"); | |
109 | } else { | |
3049ea7e CG |
110 | hdpu_slot_id->proc_fops = &proc_slot_id; |
111 | hdpu_slot_id->owner = THIS_MODULE; | |
5f725fe9 | 112 | } |
1da177e4 | 113 | |
c74c120a AD |
114 | hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, NULL); |
115 | if (!hdpu_chassis_id) | |
5f725fe9 CG |
116 | printk(KERN_WARNING "sky_nexus: " |
117 | "Unable to create proc dir entry: sky_chassis_id\n"); | |
118 | } else { | |
3049ea7e CG |
119 | hdpu_chassis_id->proc_fops = &proc_chassis_id; |
120 | hdpu_chassis_id->owner = THIS_MODULE; | |
5f725fe9 | 121 | } |
a4e32b5f | 122 | |
1da177e4 LT |
123 | return 0; |
124 | } | |
125 | ||
3ae5eaec | 126 | static int hdpu_nexus_remove(struct platform_device *pdev) |
1da177e4 LT |
127 | { |
128 | slot_id = -1; | |
129 | chassis_id = -1; | |
a4e32b5f | 130 | |
c74c120a AD |
131 | remove_proc_entry("sky_slot_id", NULL); |
132 | remove_proc_entry("sky_chassis_id", NULL); | |
a4e32b5f | 133 | |
1da177e4 LT |
134 | hdpu_slot_id = 0; |
135 | hdpu_chassis_id = 0; | |
a4e32b5f | 136 | |
1da177e4 LT |
137 | return 0; |
138 | } | |
139 | ||
140 | static int __init nexus_init(void) | |
141 | { | |
a4e32b5f | 142 | return platform_driver_register(&hdpu_nexus_driver); |
1da177e4 LT |
143 | } |
144 | ||
145 | static void __exit nexus_exit(void) | |
146 | { | |
3ae5eaec | 147 | platform_driver_unregister(&hdpu_nexus_driver); |
1da177e4 LT |
148 | } |
149 | ||
150 | module_init(nexus_init); | |
151 | module_exit(nexus_exit); | |
152 | ||
153 | MODULE_AUTHOR("Brian Waite"); | |
154 | MODULE_LICENSE("GPL"); | |
d6c23850 | 155 | MODULE_ALIAS("platform:" HDPU_NEXUS_NAME); |