1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * /proc/bus/pnp interface for Plug and Play devices 4 * 5 * Written by David Hinds, dahinds@users.sourceforge.net 6 * Modified by Thomas Hood 7 * 8 * The .../devices and .../<node> and .../boot/<node> files are 9 * utilized by the lspnp and setpnp utilities, supplied with the 10 * pcmcia-cs package. 11 * http://pcmcia-cs.sourceforge.net 12 * 13 * The .../escd file is utilized by the lsescd utility written by 14 * Gunther Mayer. 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 <linux/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%3phC\t%04x\n", 190 node->handle, node->eisa_id, 191 node->type_code, node->flags); 192 if (nodenum <= thisnodenum) { 193 printk(KERN_ERR 194 "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 195 "PnPBIOS: proc_read_devices:", 196 (unsigned int)nodenum, 197 (unsigned int)thisnodenum); 198 break; 199 } 200 } 201 kfree(node); 202 return 0; 203 } 204 205 static int pnp_devices_proc_open(struct inode *inode, struct file *file) 206 { 207 return single_open(file, pnp_devices_proc_show, NULL); 208 } 209 210 static const struct file_operations pnp_devices_proc_fops = { 211 .owner = THIS_MODULE, 212 .open = pnp_devices_proc_open, 213 .read = seq_read, 214 .llseek = seq_lseek, 215 .release = single_release, 216 }; 217 218 static int pnpbios_proc_show(struct seq_file *m, void *v) 219 { 220 void *data = m->private; 221 struct pnp_bios_node *node; 222 int boot = (long)data >> 8; 223 u8 nodenum = (long)data; 224 int len; 225 226 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 227 if (!node) 228 return -ENOMEM; 229 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 230 kfree(node); 231 return -EIO; 232 } 233 len = node->size - sizeof(struct pnp_bios_node); 234 seq_write(m, node->data, len); 235 kfree(node); 236 return 0; 237 } 238 239 static int pnpbios_proc_open(struct inode *inode, struct file *file) 240 { 241 return single_open(file, pnpbios_proc_show, PDE_DATA(inode)); 242 } 243 244 static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf, 245 size_t count, loff_t *pos) 246 { 247 void *data = PDE_DATA(file_inode(file)); 248 struct pnp_bios_node *node; 249 int boot = (long)data >> 8; 250 u8 nodenum = (long)data; 251 int ret = count; 252 253 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 254 if (!node) 255 return -ENOMEM; 256 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 257 ret = -EIO; 258 goto out; 259 } 260 if (count != node->size - sizeof(struct pnp_bios_node)) { 261 ret = -EINVAL; 262 goto out; 263 } 264 if (copy_from_user(node->data, buf, count)) { 265 ret = -EFAULT; 266 goto out; 267 } 268 if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) { 269 ret = -EINVAL; 270 goto out; 271 } 272 ret = count; 273 out: 274 kfree(node); 275 return ret; 276 } 277 278 static const struct file_operations pnpbios_proc_fops = { 279 .owner = THIS_MODULE, 280 .open = pnpbios_proc_open, 281 .read = seq_read, 282 .llseek = seq_lseek, 283 .release = single_release, 284 .write = pnpbios_proc_write, 285 }; 286 287 int pnpbios_interface_attach_device(struct pnp_bios_node *node) 288 { 289 char name[3]; 290 291 sprintf(name, "%02x", node->handle); 292 293 if (!proc_pnp) 294 return -EIO; 295 if (!pnpbios_dont_use_current_config) { 296 proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops, 297 (void *)(long)(node->handle)); 298 } 299 300 if (!proc_pnp_boot) 301 return -EIO; 302 if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops, 303 (void *)(long)(node->handle + 0x100))) 304 return 0; 305 return -EIO; 306 } 307 308 /* 309 * When this is called, pnpbios functions are assumed to 310 * work and the pnpbios_dont_use_current_config flag 311 * should already have been set to the appropriate value 312 */ 313 int __init pnpbios_proc_init(void) 314 { 315 proc_pnp = proc_mkdir("bus/pnp", NULL); 316 if (!proc_pnp) 317 return -EIO; 318 proc_pnp_boot = proc_mkdir("boot", proc_pnp); 319 if (!proc_pnp_boot) 320 return -EIO; 321 proc_create("devices", 0, proc_pnp, &pnp_devices_proc_fops); 322 proc_create("configuration_info", 0, proc_pnp, &pnpconfig_proc_fops); 323 proc_create("escd_info", 0, proc_pnp, &escd_info_proc_fops); 324 proc_create("escd", S_IRUSR, proc_pnp, &escd_proc_fops); 325 proc_create("legacy_device_resources", 0, proc_pnp, &pnp_legacyres_proc_fops); 326 327 return 0; 328 } 329 330 void __exit pnpbios_proc_exit(void) 331 { 332 int i; 333 char name[3]; 334 335 if (!proc_pnp) 336 return; 337 338 for (i = 0; i < 0xff; i++) { 339 sprintf(name, "%02x", i); 340 if (!pnpbios_dont_use_current_config) 341 remove_proc_entry(name, proc_pnp); 342 remove_proc_entry(name, proc_pnp_boot); 343 } 344 remove_proc_entry("legacy_device_resources", proc_pnp); 345 remove_proc_entry("escd", proc_pnp); 346 remove_proc_entry("escd_info", proc_pnp); 347 remove_proc_entry("configuration_info", proc_pnp); 348 remove_proc_entry("devices", proc_pnp); 349 remove_proc_entry("boot", proc_pnp); 350 remove_proc_entry("bus/pnp", NULL); 351 } 352