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 <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 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 } 351