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/pnp.h> 27 #include <linux/seq_file.h> 28 #include <linux/init.h> 29 30 #include <asm/uaccess.h> 31 32 #include "pnpbios.h" 33 34 static struct proc_dir_entry *proc_pnp = NULL; 35 static struct proc_dir_entry *proc_pnp_boot = NULL; 36 37 static int pnpconfig_proc_show(struct seq_file *m, void *v) 38 { 39 struct pnp_isa_config_struc pnps; 40 41 if (pnp_bios_isapnp_config(&pnps)) 42 return -EIO; 43 seq_printf(m, "structure_revision %d\n" 44 "number_of_CSNs %d\n" 45 "ISA_read_data_port 0x%x\n", 46 pnps.revision, pnps.no_csns, pnps.isa_rd_data_port); 47 return 0; 48 } 49 50 static int pnpconfig_proc_open(struct inode *inode, struct file *file) 51 { 52 return single_open(file, pnpconfig_proc_show, NULL); 53 } 54 55 static const struct file_operations pnpconfig_proc_fops = { 56 .owner = THIS_MODULE, 57 .open = pnpconfig_proc_open, 58 .read = seq_read, 59 .llseek = seq_lseek, 60 .release = single_release, 61 }; 62 63 static int escd_info_proc_show(struct seq_file *m, void *v) 64 { 65 struct escd_info_struc escd; 66 67 if (pnp_bios_escd_info(&escd)) 68 return -EIO; 69 seq_printf(m, "min_ESCD_write_size %d\n" 70 "ESCD_size %d\n" 71 "NVRAM_base 0x%x\n", 72 escd.min_escd_write_size, 73 escd.escd_size, escd.nv_storage_base); 74 return 0; 75 } 76 77 static int escd_info_proc_open(struct inode *inode, struct file *file) 78 { 79 return single_open(file, escd_info_proc_show, NULL); 80 } 81 82 static const struct file_operations escd_info_proc_fops = { 83 .owner = THIS_MODULE, 84 .open = escd_info_proc_open, 85 .read = seq_read, 86 .llseek = seq_lseek, 87 .release = single_release, 88 }; 89 90 #define MAX_SANE_ESCD_SIZE (32*1024) 91 static int escd_proc_show(struct seq_file *m, void *v) 92 { 93 struct escd_info_struc escd; 94 char *tmpbuf; 95 int escd_size; 96 97 if (pnp_bios_escd_info(&escd)) 98 return -EIO; 99 100 /* sanity check */ 101 if (escd.escd_size > MAX_SANE_ESCD_SIZE) { 102 printk(KERN_ERR 103 "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__); 104 return -EFBIG; 105 } 106 107 tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL); 108 if (!tmpbuf) 109 return -ENOMEM; 110 111 if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) { 112 kfree(tmpbuf); 113 return -EIO; 114 } 115 116 escd_size = 117 (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256; 118 119 /* sanity check */ 120 if (escd_size > MAX_SANE_ESCD_SIZE) { 121 printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by" 122 " BIOS read_escd call is too great\n", __func__); 123 kfree(tmpbuf); 124 return -EFBIG; 125 } 126 127 seq_write(m, tmpbuf, escd_size); 128 kfree(tmpbuf); 129 return 0; 130 } 131 132 static int escd_proc_open(struct inode *inode, struct file *file) 133 { 134 return single_open(file, escd_proc_show, NULL); 135 } 136 137 static const struct file_operations escd_proc_fops = { 138 .owner = THIS_MODULE, 139 .open = escd_proc_open, 140 .read = seq_read, 141 .llseek = seq_lseek, 142 .release = single_release, 143 }; 144 145 static int pnp_legacyres_proc_show(struct seq_file *m, void *v) 146 { 147 void *buf; 148 149 buf = kmalloc(65536, GFP_KERNEL); 150 if (!buf) 151 return -ENOMEM; 152 if (pnp_bios_get_stat_res(buf)) { 153 kfree(buf); 154 return -EIO; 155 } 156 157 seq_write(m, buf, 65536); 158 kfree(buf); 159 return 0; 160 } 161 162 static int pnp_legacyres_proc_open(struct inode *inode, struct file *file) 163 { 164 return single_open(file, pnp_legacyres_proc_show, NULL); 165 } 166 167 static const struct file_operations pnp_legacyres_proc_fops = { 168 .owner = THIS_MODULE, 169 .open = pnp_legacyres_proc_open, 170 .read = seq_read, 171 .llseek = seq_lseek, 172 .release = single_release, 173 }; 174 175 static int pnp_devices_proc_show(struct seq_file *m, void *v) 176 { 177 struct pnp_bios_node *node; 178 u8 nodenum; 179 180 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 181 if (!node) 182 return -ENOMEM; 183 184 for (nodenum = 0; nodenum < 0xff;) { 185 u8 thisnodenum = nodenum; 186 187 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node)) 188 break; 189 seq_printf(m, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n", 190 node->handle, node->eisa_id, 191 node->type_code[0], node->type_code[1], 192 node->type_code[2], node->flags); 193 if (nodenum <= thisnodenum) { 194 printk(KERN_ERR 195 "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 196 "PnPBIOS: proc_read_devices:", 197 (unsigned int)nodenum, 198 (unsigned int)thisnodenum); 199 break; 200 } 201 } 202 kfree(node); 203 return 0; 204 } 205 206 static int pnp_devices_proc_open(struct inode *inode, struct file *file) 207 { 208 return single_open(file, pnp_devices_proc_show, NULL); 209 } 210 211 static const struct file_operations pnp_devices_proc_fops = { 212 .owner = THIS_MODULE, 213 .open = pnp_devices_proc_open, 214 .read = seq_read, 215 .llseek = seq_lseek, 216 .release = single_release, 217 }; 218 219 static int pnpbios_proc_show(struct seq_file *m, void *v) 220 { 221 void *data = m->private; 222 struct pnp_bios_node *node; 223 int boot = (long)data >> 8; 224 u8 nodenum = (long)data; 225 int len; 226 227 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 228 if (!node) 229 return -ENOMEM; 230 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 231 kfree(node); 232 return -EIO; 233 } 234 len = node->size - sizeof(struct pnp_bios_node); 235 seq_write(m, node->data, len); 236 kfree(node); 237 return 0; 238 } 239 240 static int pnpbios_proc_open(struct inode *inode, struct file *file) 241 { 242 return single_open(file, pnpbios_proc_show, PDE(inode)->data); 243 } 244 245 static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf, 246 size_t count, loff_t *pos) 247 { 248 void *data = PDE(file->f_path.dentry->d_inode)->data; 249 struct pnp_bios_node *node; 250 int boot = (long)data >> 8; 251 u8 nodenum = (long)data; 252 int ret = count; 253 254 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 255 if (!node) 256 return -ENOMEM; 257 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 258 ret = -EIO; 259 goto out; 260 } 261 if (count != node->size - sizeof(struct pnp_bios_node)) { 262 ret = -EINVAL; 263 goto out; 264 } 265 if (copy_from_user(node->data, buf, count)) { 266 ret = -EFAULT; 267 goto out; 268 } 269 if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) { 270 ret = -EINVAL; 271 goto out; 272 } 273 ret = count; 274 out: 275 kfree(node); 276 return ret; 277 } 278 279 static const struct file_operations pnpbios_proc_fops = { 280 .owner = THIS_MODULE, 281 .open = pnpbios_proc_open, 282 .read = seq_read, 283 .llseek = seq_lseek, 284 .release = single_release, 285 .write = pnpbios_proc_write, 286 }; 287 288 int pnpbios_interface_attach_device(struct pnp_bios_node *node) 289 { 290 char name[3]; 291 292 sprintf(name, "%02x", node->handle); 293 294 if (!proc_pnp) 295 return -EIO; 296 if (!pnpbios_dont_use_current_config) { 297 proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops, 298 (void *)(long)(node->handle)); 299 } 300 301 if (!proc_pnp_boot) 302 return -EIO; 303 if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops, 304 (void *)(long)(node->handle + 0x100))) 305 return 0; 306 return -EIO; 307 } 308 309 /* 310 * When this is called, pnpbios functions are assumed to 311 * work and the pnpbios_dont_use_current_config flag 312 * should already have been set to the appropriate value 313 */ 314 int __init pnpbios_proc_init(void) 315 { 316 proc_pnp = proc_mkdir("bus/pnp", NULL); 317 if (!proc_pnp) 318 return -EIO; 319 proc_pnp_boot = proc_mkdir("boot", proc_pnp); 320 if (!proc_pnp_boot) 321 return -EIO; 322 proc_create("devices", 0, proc_pnp, &pnp_devices_proc_fops); 323 proc_create("configuration_info", 0, proc_pnp, &pnpconfig_proc_fops); 324 proc_create("escd_info", 0, proc_pnp, &escd_info_proc_fops); 325 proc_create("escd", S_IRUSR, proc_pnp, &escd_proc_fops); 326 proc_create("legacy_device_resources", 0, proc_pnp, &pnp_legacyres_proc_fops); 327 328 return 0; 329 } 330 331 void __exit pnpbios_proc_exit(void) 332 { 333 int i; 334 char name[3]; 335 336 if (!proc_pnp) 337 return; 338 339 for (i = 0; i < 0xff; i++) { 340 sprintf(name, "%02x", i); 341 if (!pnpbios_dont_use_current_config) 342 remove_proc_entry(name, proc_pnp); 343 remove_proc_entry(name, proc_pnp_boot); 344 } 345 remove_proc_entry("legacy_device_resources", proc_pnp); 346 remove_proc_entry("escd", proc_pnp); 347 remove_proc_entry("escd_info", proc_pnp); 348 remove_proc_entry("configuration_info", proc_pnp); 349 remove_proc_entry("devices", proc_pnp); 350 remove_proc_entry("boot", proc_pnp); 351 remove_proc_entry("bus/pnp", NULL); 352 } 353