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/types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/nubus.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27
  28 #include <linux/uaccess.h>
  29 #include <asm/byteorder.h>
  30
  31 static int
  32 nubus_devices_proc_show(struct seq_file *m, void *v)
  33 {
  34         struct nubus_dev *dev = nubus_devices;
  35
  36         while (dev) {
  37                 seq_printf(m, "%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                 seq_printf(m, "\t%08lx\n", dev->board->slot_addr);
  44                 dev = dev->next;
  45         }
  46         return 0;
  47 }
  48
  49 static int nubus_devices_proc_open(struct inode *inode, struct file *file)
  50 {
  51         return single_open(file, nubus_devices_proc_show, NULL);
  52 }
  53
  54 static const struct file_operations nubus_devices_proc_fops = {
  55         .open           = nubus_devices_proc_open,
  56         .read           = seq_read,
  57         .llseek         = seq_lseek,
  58         .release        = single_release,
  59 };
  60
  61 static struct proc_dir_entry *proc_bus_nubus_dir;
  62
  63 static const struct file_operations nubus_proc_subdir_fops = {
  64 #warning Need to set some I/O handlers here
  65 };
  66
  67 static void nubus_proc_subdir(struct nubus_dev* dev,
  68                               struct proc_dir_entry* parent,
  69                               struct nubus_dir* dir)
  70 {
  71         struct nubus_dirent ent;
  72
  73         /* Some of these are directories, others aren't */
  74         while (nubus_readdir(dir, &ent) != -1) {
  75                 char name[8];
  76                 struct proc_dir_entry* e;
  77
  78                 sprintf(name, "%x", ent.type);
  79                 e = proc_create(name, S_IFREG | S_IRUGO | S_IWUSR, parent,
  80                                 &nubus_proc_subdir_fops);
  81                 if (!e)
  82                         return;
  83         }
  84 }
  85
  86 /* Can't do this recursively since the root directory is structured
  87    somewhat differently from the subdirectories */
  88 static void nubus_proc_populate(struct nubus_dev* dev,
  89                                 struct proc_dir_entry* parent,
  90                                 struct nubus_dir* root)
  91 {
  92         struct nubus_dirent ent;
  93
  94         /* We know these are all directories (board resource + one or
  95            more functional resources) */
  96         while (nubus_readdir(root, &ent) != -1) {
  97                 char name[8];
  98                 struct proc_dir_entry* e;
  99                 struct nubus_dir dir;
 100
 101                 sprintf(name, "%x", ent.type);
 102                 e = proc_mkdir(name, parent);
 103                 if (!e) return;
 104
 105                 /* And descend */
 106                 if (nubus_get_subdir(&ent, &dir) == -1) {
 107                         /* This shouldn't happen */
 108                         printk(KERN_ERR "NuBus root directory node %x:%x has no subdir!\n",
 109                                dev->board->slot, ent.type);
 110                         continue;
 111                 } else {
 112                         nubus_proc_subdir(dev, e, &dir);
 113                 }
 114         }
 115 }
 116
 117 int nubus_proc_attach_device(struct nubus_dev *dev)
 118 {
 119         struct proc_dir_entry *e;
 120         struct nubus_dir root;
 121         char name[8];
 122
 123         if (dev == NULL) {
 124                 printk(KERN_ERR
 125                        "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n");
 126                 return -1;
 127         }
 128
 129         if (dev->board == NULL) {
 130                 printk(KERN_ERR
 131                        "NULL pointer in nubus_proc_attach_device, shoot the programmer!\n");
 132                 printk("dev = %p, dev->board = %p\n", dev, dev->board);
 133                 return -1;
 134         }
 135
 136         /* Create a directory */
 137         sprintf(name, "%x", dev->board->slot);
 138         e = dev->procdir = proc_mkdir(name, proc_bus_nubus_dir);
 139         if (!e)
 140                 return -ENOMEM;
 141
 142         /* Now recursively populate it with files */
 143         nubus_get_root_dir(dev->board, &root);
 144         nubus_proc_populate(dev, e, &root);
 145
 146         return 0;
 147 }
 148 EXPORT_SYMBOL(nubus_proc_attach_device);
 149
 150 /*
 151  * /proc/nubus stuff
 152  */
 153 static int nubus_proc_show(struct seq_file *m, void *v)
 154 {
 155         const struct nubus_board *board = v;
 156
 157         /* Display header on line 1 */
 158         if (v == SEQ_START_TOKEN)
 159                 seq_puts(m, "Nubus devices found:\n");
 160         else
 161                 seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
 162         return 0;
 163 }
 164
 165 static void *nubus_proc_start(struct seq_file *m, loff_t *_pos)
 166 {
 167         struct nubus_board *board;
 168         unsigned pos;
 169
 170         if (*_pos > LONG_MAX)
 171                 return NULL;
 172         pos = *_pos;
 173         if (pos == 0)
 174                 return SEQ_START_TOKEN;
 175         for (board = nubus_boards; board; board = board->next)
 176                 if (--pos == 0)
 177                         break;
 178         return board;
 179 }
 180
 181 static void *nubus_proc_next(struct seq_file *p, void *v, loff_t *_pos)
 182 {
 183         /* Walk the list of NuBus boards */
 184         struct nubus_board *board = v;
 185
 186         ++*_pos;
 187         if (v == SEQ_START_TOKEN)
 188                 board = nubus_boards;
 189         else if (board)
 190                 board = board->next;
 191         return board;
 192 }
 193
 194 static void nubus_proc_stop(struct seq_file *p, void *v)
 195 {
 196 }
 197
 198 static const struct seq_operations nubus_proc_seqops = {
 199         .start  = nubus_proc_start,
 200         .next   = nubus_proc_next,
 201         .stop   = nubus_proc_stop,
 202         .show   = nubus_proc_show,
 203 };
 204
 205 static int nubus_proc_open(struct inode *inode, struct file *file)
 206 {
 207         return seq_open(file, &nubus_proc_seqops);
 208 }
 209
 210 static const struct file_operations nubus_proc_fops = {
 211         .open           = nubus_proc_open,
 212         .read           = seq_read,
 213         .llseek         = seq_lseek,
 214         .release        = seq_release,
 215 };
 216
 217 void __init proc_bus_nubus_add_devices(void)
 218 {
 219         struct nubus_dev *dev;
 220
 221         for(dev = nubus_devices; dev; dev = dev->next)
 222                 nubus_proc_attach_device(dev);
 223 }
 224
 225 void __init nubus_proc_init(void)
 226 {
 227         proc_create("nubus", 0, NULL, &nubus_proc_fops);
 228         if (!MACH_IS_MAC)
 229                 return;
 230         proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
 231         proc_create("devices", 0, proc_bus_nubus_dir, &nubus_devices_proc_fops);
 232         proc_bus_nubus_add_devices();
 233 }