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  *
  15  * The .../legacy_device_resources file is not used yet.
  16  *
  17  * The other files are human-readable.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/types.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/pnp.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/init.h>
  28
  29 #include <linux/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 pnpconfig_proc_show(struct seq_file *m, void *v)
  37 {
  38         struct pnp_isa_config_struc pnps;
  39
  40         if (pnp_bios_isapnp_config(&pnps))
  41                 return -EIO;
  42         seq_printf(m, "structure_revision %d\n"
  43                       "number_of_CSNs %d\n"
  44                       "ISA_read_data_port 0x%x\n",
  45                    pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
  46         return 0;
  47 }
  48
  49 static int pnpconfig_proc_open(struct inode *inode, struct file *file)
  50 {
  51         return single_open(file, pnpconfig_proc_show, NULL);
  52 }
  53
  54 static const struct file_operations pnpconfig_proc_fops = {
  55         .owner          = THIS_MODULE,
  56         .open           = pnpconfig_proc_open,
  57         .read           = seq_read,
  58         .llseek         = seq_lseek,
  59         .release        = single_release,
  60 };
  61
  62 static int escd_info_proc_show(struct seq_file *m, void *v)
  63 {
  64         struct escd_info_struc escd;
  65
  66         if (pnp_bios_escd_info(&escd))
  67                 return -EIO;
  68         seq_printf(m, "min_ESCD_write_size %d\n"
  69                         "ESCD_size %d\n"
  70                         "NVRAM_base 0x%x\n",
  71                         escd.min_escd_write_size,
  72                         escd.escd_size, escd.nv_storage_base);
  73         return 0;
  74 }
  75
  76 static int escd_info_proc_open(struct inode *inode, struct file *file)
  77 {
  78         return single_open(file, escd_info_proc_show, NULL);
  79 }
  80
  81 static const struct file_operations escd_info_proc_fops = {
  82         .owner          = THIS_MODULE,
  83         .open           = escd_info_proc_open,
  84         .read           = seq_read,
  85         .llseek         = seq_lseek,
  86         .release        = single_release,
  87 };
  88
  89 #define MAX_SANE_ESCD_SIZE (32*1024)
  90 static int escd_proc_show(struct seq_file *m, void *v)
  91 {
  92         struct escd_info_struc escd;
  93         char *tmpbuf;
  94         int escd_size;
  95
  96         if (pnp_bios_escd_info(&escd))
  97                 return -EIO;
  98
  99         /* sanity check */
 100         if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
 101                 printk(KERN_ERR
 102                        "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
 103                 return -EFBIG;
 104         }
 105
 106         tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
 107         if (!tmpbuf)
 108                 return -ENOMEM;
 109
 110         if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
 111                 kfree(tmpbuf);
 112                 return -EIO;
 113         }
 114
 115         escd_size =
 116             (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
 117
 118         /* sanity check */
 119         if (escd_size > MAX_SANE_ESCD_SIZE) {
 120                 printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by"
 121                                 " BIOS read_escd call is too great\n", __func__);
 122                 kfree(tmpbuf);
 123                 return -EFBIG;
 124         }
 125
 126         seq_write(m, tmpbuf, escd_size);
 127         kfree(tmpbuf);
 128         return 0;
 129 }
 130
 131 static int escd_proc_open(struct inode *inode, struct file *file)
 132 {
 133         return single_open(file, escd_proc_show, NULL);
 134 }
 135
 136 static const struct file_operations escd_proc_fops = {
 137         .owner          = THIS_MODULE,
 138         .open           = escd_proc_open,
 139         .read           = seq_read,
 140         .llseek         = seq_lseek,
 141         .release        = single_release,
 142 };
 143
 144 static int pnp_legacyres_proc_show(struct seq_file *m, void *v)
 145 {
 146         void *buf;
 147
 148         buf = kmalloc(65536, GFP_KERNEL);
 149         if (!buf)
 150                 return -ENOMEM;
 151         if (pnp_bios_get_stat_res(buf)) {
 152                 kfree(buf);
 153                 return -EIO;
 154         }
 155
 156         seq_write(m, buf, 65536);
 157         kfree(buf);
 158         return 0;
 159 }
 160
 161 static int pnp_legacyres_proc_open(struct inode *inode, struct file *file)
 162 {
 163         return single_open(file, pnp_legacyres_proc_show, NULL);
 164 }
 165
 166 static const struct file_operations pnp_legacyres_proc_fops = {
 167         .owner          = THIS_MODULE,
 168         .open           = pnp_legacyres_proc_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = single_release,
 172 };
 173
 174 static int pnp_devices_proc_show(struct seq_file *m, void *v)
 175 {
 176         struct pnp_bios_node *node;
 177         u8 nodenum;
 178
 179         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 180         if (!node)
 181                 return -ENOMEM;
 182
 183         for (nodenum = 0; nodenum < 0xff;) {
 184                 u8 thisnodenum = nodenum;
 185
 186                 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
 187                         break;
 188                 seq_printf(m, "%02x\t%08x\t%3phC\t%04x\n",
 189                              node->handle, node->eisa_id,
 190                              node->type_code, node->flags);
 191                 if (nodenum <= thisnodenum) {
 192                         printk(KERN_ERR
 193                                "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
 194                                "PnPBIOS: proc_read_devices:",
 195                                (unsigned int)nodenum,
 196                                (unsigned int)thisnodenum);
 197                         break;
 198                 }
 199         }
 200         kfree(node);
 201         return 0;
 202 }
 203
 204 static int pnp_devices_proc_open(struct inode *inode, struct file *file)
 205 {
 206         return single_open(file, pnp_devices_proc_show, NULL);
 207 }
 208
 209 static const struct file_operations pnp_devices_proc_fops = {
 210         .owner          = THIS_MODULE,
 211         .open           = pnp_devices_proc_open,
 212         .read           = seq_read,
 213         .llseek         = seq_lseek,
 214         .release        = single_release,
 215 };
 216
 217 static int pnpbios_proc_show(struct seq_file *m, void *v)
 218 {
 219         void *data = m->private;
 220         struct pnp_bios_node *node;
 221         int boot = (long)data >> 8;
 222         u8 nodenum = (long)data;
 223         int len;
 224
 225         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 226         if (!node)
 227                 return -ENOMEM;
 228         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
 229                 kfree(node);
 230                 return -EIO;
 231         }
 232         len = node->size - sizeof(struct pnp_bios_node);
 233         seq_write(m, node->data, len);
 234         kfree(node);
 235         return 0;
 236 }
 237
 238 static int pnpbios_proc_open(struct inode *inode, struct file *file)
 239 {
 240         return single_open(file, pnpbios_proc_show, PDE_DATA(inode));
 241 }
 242
 243 static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
 244                                   size_t count, loff_t *pos)
 245 {
 246         void *data = PDE_DATA(file_inode(file));
 247         struct pnp_bios_node *node;
 248         int boot = (long)data >> 8;
 249         u8 nodenum = (long)data;
 250         int ret = count;
 251
 252         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 253         if (!node)
 254                 return -ENOMEM;
 255         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
 256                 ret = -EIO;
 257                 goto out;
 258         }
 259         if (count != node->size - sizeof(struct pnp_bios_node)) {
 260                 ret = -EINVAL;
 261                 goto out;
 262         }
 263         if (copy_from_user(node->data, buf, count)) {
 264                 ret = -EFAULT;
 265                 goto out;
 266         }
 267         if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
 268                 ret = -EINVAL;
 269                 goto out;
 270         }
 271         ret = count;
 272 out:
 273         kfree(node);
 274         return ret;
 275 }
 276
 277 static const struct file_operations pnpbios_proc_fops = {
 278         .owner          = THIS_MODULE,
 279         .open           = pnpbios_proc_open,
 280         .read           = seq_read,
 281         .llseek         = seq_lseek,
 282         .release        = single_release,
 283         .write          = pnpbios_proc_write,
 284 };
 285
 286 int pnpbios_interface_attach_device(struct pnp_bios_node *node)
 287 {
 288         char name[3];
 289
 290         sprintf(name, "%02x", node->handle);
 291
 292         if (!proc_pnp)
 293                 return -EIO;
 294         if (!pnpbios_dont_use_current_config) {
 295                 proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops,
 296                                  (void *)(long)(node->handle));
 297         }
 298
 299         if (!proc_pnp_boot)
 300                 return -EIO;
 301         if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops,
 302                              (void *)(long)(node->handle + 0x100)))
 303                 return 0;
 304         return -EIO;
 305 }
 306
 307 /*
 308  * When this is called, pnpbios functions are assumed to
 309  * work and the pnpbios_dont_use_current_config flag
 310  * should already have been set to the appropriate value
 311  */
 312 int __init pnpbios_proc_init(void)
 313 {
 314         proc_pnp = proc_mkdir("bus/pnp", NULL);
 315         if (!proc_pnp)
 316                 return -EIO;
 317         proc_pnp_boot = proc_mkdir("boot", proc_pnp);
 318         if (!proc_pnp_boot)
 319                 return -EIO;
 320         proc_create("devices", 0, proc_pnp, &pnp_devices_proc_fops);
 321         proc_create("configuration_info", 0, proc_pnp, &pnpconfig_proc_fops);
 322         proc_create("escd_info", 0, proc_pnp, &escd_info_proc_fops);
 323         proc_create("escd", S_IRUSR, proc_pnp, &escd_proc_fops);
 324         proc_create("legacy_device_resources", 0, proc_pnp, &pnp_legacyres_proc_fops);
 325
 326         return 0;
 327 }
 328
 329 void __exit pnpbios_proc_exit(void)
 330 {
 331         int i;
 332         char name[3];
 333
 334         if (!proc_pnp)
 335                 return;
 336
 337         for (i = 0; i < 0xff; i++) {
 338                 sprintf(name, "%02x", i);
 339                 if (!pnpbios_dont_use_current_config)
 340                         remove_proc_entry(name, proc_pnp);
 341                 remove_proc_entry(name, proc_pnp_boot);
 342         }
 343         remove_proc_entry("legacy_device_resources", proc_pnp);
 344         remove_proc_entry("escd", proc_pnp);
 345         remove_proc_entry("escd_info", proc_pnp);
 346         remove_proc_entry("configuration_info", proc_pnp);
 347         remove_proc_entry("devices", proc_pnp);
 348         remove_proc_entry("boot", proc_pnp);
 349         remove_proc_entry("bus/pnp", NULL);
 350 }