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1da177e4 LT |
1 | /* drivers/nubus/proc.c: Proc FS interface for NuBus. |
2 | ||
3 | By David Huggins-Daines <dhd@debian.org> | |
4 | ||
5 | Much code and many ideas from drivers/pci/proc.c: | |
6 | Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | |
7 | ||
8 | This is initially based on the Zorro and PCI interfaces. However, | |
9 | it works somewhat differently. The intent is to provide a | |
10 | structure in /proc analogous to the structure of the NuBus ROM | |
11 | resources. | |
12 | ||
13 | Therefore each NuBus device is in fact a directory, which may in | |
14 | turn contain subdirectories. The "files" correspond to NuBus | |
15 | resource records. For those types of records which we know how to | |
16 | convert to formats that are meaningful to userspace (mostly just | |
17 | icons) these files will provide "cooked" data. Otherwise they will | |
18 | simply provide raw access (read-only of course) to the ROM. */ | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/nubus.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/init.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/byteorder.h> | |
27 | ||
28 | static int | |
29 | get_nubus_dev_info(char *buf, char **start, off_t pos, int count) | |
30 | { | |
31 | struct nubus_dev *dev = nubus_devices; | |
32 | off_t at = 0; | |
33 | int len, cnt; | |
34 | ||
35 | cnt = 0; | |
36 | while (dev && count > cnt) { | |
37 | len = sprintf(buf, "%x\t%04x %04x %04x %04x", | |
38 | dev->board->slot, | |
39 | dev->category, | |
40 | dev->type, | |
41 | dev->dr_sw, | |
42 | dev->dr_hw); | |
43 | len += sprintf(buf+len, | |
44 | "\t%08lx", | |
45 | dev->board->slot_addr); | |
46 | buf[len++] = '\n'; | |
47 | at += len; | |
48 | if (at >= pos) { | |
49 | if (!*start) { | |
50 | *start = buf + (pos - (at - len)); | |
51 | cnt = at - pos; | |
52 | } else | |
53 | cnt += len; | |
54 | buf += len; | |
55 | } | |
56 | dev = dev->next; | |
57 | } | |
58 | return (count > cnt) ? cnt : count; | |
59 | } | |
60 | ||
61 | static struct proc_dir_entry *proc_bus_nubus_dir; | |
62 | ||
63 | static void nubus_proc_subdir(struct nubus_dev* dev, | |
64 | struct proc_dir_entry* parent, | |
65 | struct nubus_dir* dir) | |
66 | { | |
67 | struct nubus_dirent ent; | |
68 | ||
69 | /* Some of these are directories, others aren't */ | |
70 | while (nubus_readdir(dir, &ent) != -1) { | |
71 | char name[8]; | |
72 | struct proc_dir_entry* e; | |
73 | ||
74 | sprintf(name, "%x", ent.type); | |
75 | e = create_proc_entry(name, S_IFREG | S_IRUGO | | |
76 | S_IWUSR, parent); | |
77 | if (!e) return; | |
78 | } | |
79 | } | |
80 | ||
81 | /* Can't do this recursively since the root directory is structured | |
82 | somewhat differently from the subdirectories */ | |
83 | static void nubus_proc_populate(struct nubus_dev* dev, | |
84 | struct proc_dir_entry* parent, | |
85 | struct nubus_dir* root) | |
86 | { | |
87 | struct nubus_dirent ent; | |
88 | ||
89 | /* We know these are all directories (board resource + one or | |
90 | more functional resources) */ | |
91 | while (nubus_readdir(root, &ent) != -1) { | |
92 | char name[8]; | |
93 | struct proc_dir_entry* e; | |
94 | struct nubus_dir dir; | |
95 | ||
96 | sprintf(name, "%x", ent.type); | |
97 | e = proc_mkdir(name, parent); | |
98 | if (!e) return; | |
99 | ||
100 | /* And descend */ | |
101 | if (nubus_get_subdir(&ent, &dir) == -1) { | |
102 | /* This shouldn't happen */ | |
103 | printk(KERN_ERR "NuBus root directory node %x:%x has no subdir!\n", | |
104 | dev->board->slot, ent.type); | |
105 | continue; | |
106 | } else { | |
107 | nubus_proc_subdir(dev, e, &dir); | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
112 | int nubus_proc_attach_device(struct nubus_dev *dev) | |
113 | { | |
114 | struct proc_dir_entry *e; | |
115 | struct nubus_dir root; | |
116 | char name[8]; | |
117 | ||
118 | if (dev == NULL) { | |
119 | printk(KERN_ERR | |
120 | "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n"); | |
121 | return -1; | |
122 | } | |
123 | ||
124 | if (dev->board == NULL) { | |
125 | printk(KERN_ERR | |
126 | "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n"); | |
127 | printk("dev = %p, dev->board = %p\n", dev, dev->board); | |
128 | return -1; | |
129 | } | |
130 | ||
131 | /* Create a directory */ | |
132 | sprintf(name, "%x", dev->board->slot); | |
133 | e = dev->procdir = proc_mkdir(name, proc_bus_nubus_dir); | |
134 | if (!e) | |
135 | return -ENOMEM; | |
136 | ||
137 | /* Now recursively populate it with files */ | |
138 | nubus_get_root_dir(dev->board, &root); | |
139 | nubus_proc_populate(dev, e, &root); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | /* FIXME: this is certainly broken! */ | |
145 | int nubus_proc_detach_device(struct nubus_dev *dev) | |
146 | { | |
147 | struct proc_dir_entry *e; | |
148 | ||
149 | if ((e = dev->procdir)) { | |
150 | if (atomic_read(&e->count)) | |
151 | return -EBUSY; | |
152 | remove_proc_entry(e->name, proc_bus_nubus_dir); | |
153 | dev->procdir = NULL; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | void __init proc_bus_nubus_add_devices(void) | |
159 | { | |
160 | struct nubus_dev *dev; | |
161 | ||
162 | for(dev = nubus_devices; dev; dev = dev->next) | |
163 | nubus_proc_attach_device(dev); | |
164 | } | |
165 | ||
166 | void __init nubus_proc_init(void) | |
167 | { | |
168 | if (!MACH_IS_MAC) | |
169 | return; | |
170 | proc_bus_nubus_dir = proc_mkdir("nubus", proc_bus); | |
171 | create_proc_info_entry("devices", 0, proc_bus_nubus_dir, | |
172 | get_nubus_dev_info); | |
173 | proc_bus_nubus_add_devices(); | |
174 | } |