File: /usr/src/linux/drivers/nubus/proc.c
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/ptrace.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/nubus.h>
24 #include <linux/proc_fs.h>
25 #include <linux/init.h>
26 #include <asm/uaccess.h>
27 #include <asm/byteorder.h>
28
29 static int
30 get_nubus_dev_info(char *buf, char **start, off_t pos, int count)
31 {
32 struct nubus_dev *dev = nubus_devices;
33 off_t at = 0;
34 int len, cnt;
35
36 cnt = 0;
37 while (dev && count > cnt) {
38 len = sprintf(buf, "%x\t%04x %04x %04x %04x",
39 dev->board->slot,
40 dev->category,
41 dev->type,
42 dev->dr_sw,
43 dev->dr_hw);
44 len += sprintf(buf+len,
45 "\t%08lx",
46 dev->board->slot_addr);
47 buf[len++] = '\n';
48 at += len;
49 if (at >= pos) {
50 if (!*start) {
51 *start = buf + (pos - (at - len));
52 cnt = at - pos;
53 } else
54 cnt += len;
55 buf += len;
56 }
57 dev = dev->next;
58 }
59 return (count > cnt) ? cnt : count;
60 }
61
62 static struct proc_dir_entry *proc_bus_nubus_dir;
63
64 static void nubus_proc_subdir(struct nubus_dev* dev,
65 struct proc_dir_entry* parent,
66 struct nubus_dir* dir)
67 {
68 struct nubus_dirent ent;
69
70 /* Some of these are directories, others aren't */
71 while (nubus_readdir(dir, &ent) != -1) {
72 char name[8];
73 struct proc_dir_entry* e;
74
75 sprintf(name, "%x", ent.type);
76 e = create_proc_entry(name, S_IFREG | S_IRUGO |
77 S_IWUSR, parent);
78 if (!e) return;
79 }
80 }
81
82 /* Can't do this recursively since the root directory is structured
83 somewhat differently from the subdirectories */
84 static void nubus_proc_populate(struct nubus_dev* dev,
85 struct proc_dir_entry* parent,
86 struct nubus_dir* root)
87 {
88 struct nubus_dirent ent;
89
90 /* We know these are all directories (board resource + one or
91 more functional resources) */
92 while (nubus_readdir(root, &ent) != -1) {
93 char name[8];
94 struct proc_dir_entry* e;
95 struct nubus_dir dir;
96
97 sprintf(name, "%x", ent.type);
98 e = proc_mkdir(name, parent);
99 if (!e) return;
100
101 /* And descend */
102 if (nubus_get_subdir(&ent, &dir) == -1) {
103 /* This shouldn't happen */
104 printk(KERN_ERR "NuBus root directory node %x:%x has no subdir!\n",
105 dev->board->slot, ent.type);
106 continue;
107 } else {
108 nubus_proc_subdir(dev, e, &dir);
109 }
110 }
111 }
112
113 int nubus_proc_attach_device(struct nubus_dev *dev)
114 {
115 struct proc_dir_entry *e;
116 struct nubus_dir root;
117 char name[8];
118
119 if (dev == NULL) {
120 printk(KERN_ERR
121 "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n");
122 return -1;
123 }
124
125 if (dev->board == NULL) {
126 printk(KERN_ERR
127 "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n");
128 printk("dev = %p, dev->board = %p\n", dev, dev->board);
129 return -1;
130 }
131
132 /* Create a directory */
133 sprintf(name, "%x", dev->board->slot);
134 e = dev->procdir = proc_mkdir(name, proc_bus_nubus_dir);
135 if (!e)
136 return -ENOMEM;
137
138 /* Now recursively populate it with files */
139 nubus_get_root_dir(dev->board, &root);
140 nubus_proc_populate(dev, e, &root);
141
142 return 0;
143 }
144
145 /* FIXME: this is certainly broken! */
146 int nubus_proc_detach_device(struct nubus_dev *dev)
147 {
148 struct proc_dir_entry *e;
149
150 if ((e = dev->procdir)) {
151 if (atomic_read(&e->count))
152 return -EBUSY;
153 remove_proc_entry(e->name, proc_bus_nubus_dir);
154 dev->procdir = NULL;
155 }
156 return 0;
157 }
158
159 void __init proc_bus_nubus_add_devices(void)
160 {
161 struct nubus_dev *dev;
162
163 for(dev = nubus_devices; dev; dev = dev->next)
164 nubus_proc_attach_device(dev);
165 }
166
167 void __init nubus_proc_init(void)
168 {
169 if (!MACH_IS_MAC)
170 return;
171 proc_bus_nubus_dir = proc_mkdir("nubus", proc_bus);
172 create_proc_info_entry("devices", 0, proc_bus_nubus_dir,
173 get_nubus_dev_info);
174 proc_bus_nubus_add_devices();
175 }
176