drivers/pnp/pnpbios/proc.c

   1 /*
   2  * /proc/bus/pnp interface for Plug and Play devices
   3  *
   4  * Written by David Hinds, dahinds@users.sourceforge.net
   5  * Modified by Thomas Hood
   6  *
   7  * The .../devices and .../<node> and .../boot/<node> files are
   8  * utilized by the lspnp and setpnp utilities, supplied with the
   9  * pcmcia-cs package.
  10  *     http://pcmcia-cs.sourceforge.net
  11  *
  12  * The .../escd file is utilized by the lsescd utility written by
  13  * Gunther Mayer.
  14  *     http://home.t-online.de/home/gunther.mayer/lsescd
  15  *
  16  * The .../legacy_device_resources file is not used yet.
  17  *
  18  * The other files are human-readable.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/pnpbios.h>
  27 #include <linux/init.h>
  28
  29 #include <asm/uaccess.h>
  30
  31 #include "pnpbios.h"
  32
  33 static struct proc_dir_entry *proc_pnp = NULL;
  34 static struct proc_dir_entry *proc_pnp_boot = NULL;
  35
  36 static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
  37                                int count, int *eof, void *data)
  38 {
  39         struct pnp_isa_config_struc pnps;
  40
  41         if (pnp_bios_isapnp_config(&pnps))
  42                 return -EIO;
  43         return snprintf(buf, count,
  44                         "structure_revision %d\n"
  45                         "number_of_CSNs %d\n"
  46                         "ISA_read_data_port 0x%x\n",
  47                         pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
  48 }
  49
  50 static int proc_read_escdinfo(char *buf, char **start, off_t pos,
  51                               int count, int *eof, void *data)
  52 {
  53         struct escd_info_struc escd;
  54
  55         if (pnp_bios_escd_info(&escd))
  56                 return -EIO;
  57         return snprintf(buf, count,
  58                         "min_ESCD_write_size %d\n"
  59                         "ESCD_size %d\n"
  60                         "NVRAM_base 0x%x\n",
  61                         escd.min_escd_write_size,
  62                         escd.escd_size, escd.nv_storage_base);
  63 }
  64
  65 #define MAX_SANE_ESCD_SIZE (32*1024)
  66 static int proc_read_escd(char *buf, char **start, off_t pos,
  67                           int count, int *eof, void *data)
  68 {
  69         struct escd_info_struc escd;
  70         char *tmpbuf;
  71         int escd_size, escd_left_to_read, n;
  72
  73         if (pnp_bios_escd_info(&escd))
  74                 return -EIO;
  75
  76         /* sanity check */
  77         if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
  78                 printk(KERN_ERR
  79                        "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
  80                 return -EFBIG;
  81         }
  82
  83         tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
  84         if (!tmpbuf)
  85                 return -ENOMEM;
  86
  87         if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
  88                 kfree(tmpbuf);
  89                 return -EIO;
  90         }
  91
  92         escd_size =
  93             (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
  94
  95         /* sanity check */
  96         if (escd_size > MAX_SANE_ESCD_SIZE) {
  97                 printk(KERN_ERR
  98                        "PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n");
  99                 return -EFBIG;
 100         }
 101
 102         escd_left_to_read = escd_size - pos;
 103         if (escd_left_to_read < 0)
 104                 escd_left_to_read = 0;
 105         if (escd_left_to_read == 0)
 106                 *eof = 1;
 107         n = min(count, escd_left_to_read);
 108         memcpy(buf, tmpbuf + pos, n);
 109         kfree(tmpbuf);
 110         *start = buf;
 111         return n;
 112 }
 113
 114 static int proc_read_legacyres(char *buf, char **start, off_t pos,
 115                                int count, int *eof, void *data)
 116 {
 117         /* Assume that the following won't overflow the buffer */
 118         if (pnp_bios_get_stat_res(buf))
 119                 return -EIO;
 120
 121         return count;           // FIXME: Return actual length
 122 }
 123
 124 static int proc_read_devices(char *buf, char **start, off_t pos,
 125                              int count, int *eof, void *data)
 126 {
 127         struct pnp_bios_node *node;
 128         u8 nodenum;
 129         char *p = buf;
 130
 131         if (pos >= 0xff)
 132                 return 0;
 133
 134         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 135         if (!node)
 136                 return -ENOMEM;
 137
 138         for (nodenum = pos; nodenum < 0xff;) {
 139                 u8 thisnodenum = nodenum;
 140                 /* 26 = the number of characters per line sprintf'ed */
 141                 if ((p - buf + 26) > count)
 142                         break;
 143                 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
 144                         break;
 145                 p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
 146                              node->handle, node->eisa_id,
 147                              node->type_code[0], node->type_code[1],
 148                              node->type_code[2], node->flags);
 149                 if (nodenum <= thisnodenum) {
 150                         printk(KERN_ERR
 151                                "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
 152                                "PnPBIOS: proc_read_devices:",
 153                                (unsigned int)nodenum,
 154                                (unsigned int)thisnodenum);
 155                         *eof = 1;
 156                         break;
 157                 }
 158         }
 159         kfree(node);
 160         if (nodenum == 0xff)
 161                 *eof = 1;
 162         *start = (char *)((off_t) nodenum - pos);
 163         return p - buf;
 164 }
 165
 166 static int proc_read_node(char *buf, char **start, off_t pos,
 167                           int count, int *eof, void *data)
 168 {
 169         struct pnp_bios_node *node;
 170         int boot = (long)data >> 8;
 171         u8 nodenum = (long)data;
 172         int len;
 173
 174         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 175         if (!node)
 176                 return -ENOMEM;
 177         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
 178                 kfree(node);
 179                 return -EIO;
 180         }
 181         len = node->size - sizeof(struct pnp_bios_node);
 182         memcpy(buf, node->data, len);
 183         kfree(node);
 184         return len;
 185 }
 186
 187 static int proc_write_node(struct file *file, const char __user * buf,
 188                            unsigned long count, void *data)
 189 {
 190         struct pnp_bios_node *node;
 191         int boot = (long)data >> 8;
 192         u8 nodenum = (long)data;
 193         int ret = count;
 194
 195         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 196         if (!node)
 197                 return -ENOMEM;
 198         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
 199                 ret = -EIO;
 200                 goto out;
 201         }
 202         if (count != node->size - sizeof(struct pnp_bios_node)) {
 203                 ret = -EINVAL;
 204                 goto out;
 205         }
 206         if (copy_from_user(node->data, buf, count)) {
 207                 ret = -EFAULT;
 208                 goto out;
 209         }
 210         if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
 211                 ret = -EINVAL;
 212                 goto out;
 213         }
 214         ret = count;
 215       out:
 216         kfree(node);
 217         return ret;
 218 }
 219
 220 int pnpbios_interface_attach_device(struct pnp_bios_node *node)
 221 {
 222         char name[3];
 223         struct proc_dir_entry *ent;
 224
 225         sprintf(name, "%02x", node->handle);
 226
 227         if (!proc_pnp)
 228                 return -EIO;
 229         if (!pnpbios_dont_use_current_config) {
 230                 ent = create_proc_entry(name, 0, proc_pnp);
 231                 if (ent) {
 232                         ent->read_proc = proc_read_node;
 233                         ent->write_proc = proc_write_node;
 234                         ent->data = (void *)(long)(node->handle);
 235                 }
 236         }
 237
 238         if (!proc_pnp_boot)
 239                 return -EIO;
 240         ent = create_proc_entry(name, 0, proc_pnp_boot);
 241         if (ent) {
 242                 ent->read_proc = proc_read_node;
 243                 ent->write_proc = proc_write_node;
 244                 ent->data = (void *)(long)(node->handle + 0x100);
 245                 return 0;
 246         }
 247
 248         return -EIO;
 249 }
 250
 251 /*
 252  * When this is called, pnpbios functions are assumed to
 253  * work and the pnpbios_dont_use_current_config flag
 254  * should already have been set to the appropriate value
 255  */
 256 int __init pnpbios_proc_init(void)
 257 {
 258         proc_pnp = proc_mkdir("pnp", proc_bus);
 259         if (!proc_pnp)
 260                 return -EIO;
 261         proc_pnp_boot = proc_mkdir("boot", proc_pnp);
 262         if (!proc_pnp_boot)
 263                 return -EIO;
 264         create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
 265         create_proc_read_entry("configuration_info", 0, proc_pnp,
 266                                proc_read_pnpconfig, NULL);
 267         create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
 268                                NULL);
 269         create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
 270         create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
 271                                proc_read_legacyres, NULL);
 272
 273         return 0;
 274 }
 275
 276 void __exit pnpbios_proc_exit(void)
 277 {
 278         int i;
 279         char name[3];
 280
 281         if (!proc_pnp)
 282                 return;
 283
 284         for (i = 0; i < 0xff; i++) {
 285                 sprintf(name, "%02x", i);
 286                 if (!pnpbios_dont_use_current_config)
 287                         remove_proc_entry(name, proc_pnp);
 288                 remove_proc_entry(name, proc_pnp_boot);
 289         }
 290         remove_proc_entry("legacy_device_resources", proc_pnp);
 291         remove_proc_entry("escd", proc_pnp);
 292         remove_proc_entry("escd_info", proc_pnp);
 293         remove_proc_entry("configuration_info", proc_pnp);
 294         remove_proc_entry("devices", proc_pnp);
 295         remove_proc_entry("boot", proc_pnp);
 296         remove_proc_entry("pnp", proc_bus);
 297 }