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 } 175