proc.c revision cd86128088554d64fea1679191509f00e6353c5b
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 <pcmcia/config.h> 22//#include <pcmcia/k_compat.h> 23 24#include <linux/module.h> 25#include <linux/kernel.h> 26#include <linux/slab.h> 27#include <linux/types.h> 28#include <linux/proc_fs.h> 29#include <linux/pnpbios.h> 30#include <linux/init.h> 31 32#include <asm/uaccess.h> 33 34#include "pnpbios.h" 35 36static struct proc_dir_entry *proc_pnp = NULL; 37static struct proc_dir_entry *proc_pnp_boot = NULL; 38 39static int proc_read_pnpconfig(char *buf, char **start, off_t pos, 40 int count, int *eof, void *data) 41{ 42 struct pnp_isa_config_struc pnps; 43 44 if (pnp_bios_isapnp_config(&pnps)) 45 return -EIO; 46 return snprintf(buf, count, 47 "structure_revision %d\n" 48 "number_of_CSNs %d\n" 49 "ISA_read_data_port 0x%x\n", 50 pnps.revision, 51 pnps.no_csns, 52 pnps.isa_rd_data_port 53 ); 54} 55 56static int proc_read_escdinfo(char *buf, char **start, off_t pos, 57 int count, int *eof, void *data) 58{ 59 struct escd_info_struc escd; 60 61 if (pnp_bios_escd_info(&escd)) 62 return -EIO; 63 return snprintf(buf, count, 64 "min_ESCD_write_size %d\n" 65 "ESCD_size %d\n" 66 "NVRAM_base 0x%x\n", 67 escd.min_escd_write_size, 68 escd.escd_size, 69 escd.nv_storage_base 70 ); 71} 72 73#define MAX_SANE_ESCD_SIZE (32*1024) 74static int proc_read_escd(char *buf, char **start, off_t pos, 75 int count, int *eof, void *data) 76{ 77 struct escd_info_struc escd; 78 char *tmpbuf; 79 int escd_size, escd_left_to_read, n; 80 81 if (pnp_bios_escd_info(&escd)) 82 return -EIO; 83 84 /* sanity check */ 85 if (escd.escd_size > MAX_SANE_ESCD_SIZE) { 86 printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n"); 87 return -EFBIG; 88 } 89 90 tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL); 91 if (!tmpbuf) return -ENOMEM; 92 93 if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) { 94 kfree(tmpbuf); 95 return -EIO; 96 } 97 98 escd_size = (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1])*256; 99 100 /* sanity check */ 101 if (escd_size > MAX_SANE_ESCD_SIZE) { 102 printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n"); 103 return -EFBIG; 104 } 105 106 escd_left_to_read = escd_size - pos; 107 if (escd_left_to_read < 0) escd_left_to_read = 0; 108 if (escd_left_to_read == 0) *eof = 1; 109 n = min(count,escd_left_to_read); 110 memcpy(buf, tmpbuf + pos, n); 111 kfree(tmpbuf); 112 *start = buf; 113 return n; 114} 115 116static int proc_read_legacyres(char *buf, char **start, off_t pos, 117 int count, int *eof, void *data) 118{ 119 /* Assume that the following won't overflow the buffer */ 120 if (pnp_bios_get_stat_res(buf)) 121 return -EIO; 122 123 return count; // FIXME: Return actual length 124} 125 126static int proc_read_devices(char *buf, char **start, off_t pos, 127 int count, int *eof, void *data) 128{ 129 struct pnp_bios_node *node; 130 u8 nodenum; 131 char *p = buf; 132 133 if (pos >= 0xff) 134 return 0; 135 136 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 137 if (!node) return -ENOMEM; 138 139 for (nodenum=pos; nodenum<0xff; ) { 140 u8 thisnodenum = nodenum; 141 /* 26 = the number of characters per line sprintf'ed */ 142 if ((p - buf + 26) > count) 143 break; 144 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node)) 145 break; 146 p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n", 147 node->handle, node->eisa_id, 148 node->type_code[0], node->type_code[1], 149 node->type_code[2], node->flags); 150 if (nodenum <= thisnodenum) { 151 printk(KERN_ERR "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", "PnPBIOS: proc_read_devices:", (unsigned int)nodenum, (unsigned int)thisnodenum); 152 *eof = 1; 153 break; 154 } 155 } 156 kfree(node); 157 if (nodenum == 0xff) 158 *eof = 1; 159 *start = (char *)((off_t)nodenum - pos); 160 return p - buf; 161} 162 163static int proc_read_node(char *buf, char **start, off_t pos, 164 int count, int *eof, void *data) 165{ 166 struct pnp_bios_node *node; 167 int boot = (long)data >> 8; 168 u8 nodenum = (long)data; 169 int len; 170 171 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 172 if (!node) return -ENOMEM; 173 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 174 kfree(node); 175 return -EIO; 176 } 177 len = node->size - sizeof(struct pnp_bios_node); 178 memcpy(buf, node->data, len); 179 kfree(node); 180 return len; 181} 182 183static int proc_write_node(struct file *file, const char __user *buf, 184 unsigned long count, void *data) 185{ 186 struct pnp_bios_node *node; 187 int boot = (long)data >> 8; 188 u8 nodenum = (long)data; 189 int ret = count; 190 191 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 192 if (!node) 193 return -ENOMEM; 194 if (pnp_bios_get_dev_node(&nodenum, boot, node)) { 195 ret = -EIO; 196 goto out; 197 } 198 if (count != node->size - sizeof(struct pnp_bios_node)) { 199 ret = -EINVAL; 200 goto out; 201 } 202 if (copy_from_user(node->data, buf, count)) { 203 ret = -EFAULT; 204 goto out; 205 } 206 if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) { 207 ret = -EINVAL; 208 goto out; 209 } 210 ret = count; 211out: 212 kfree(node); 213 return ret; 214} 215 216int pnpbios_interface_attach_device(struct pnp_bios_node * node) 217{ 218 char name[3]; 219 struct proc_dir_entry *ent; 220 221 sprintf(name, "%02x", node->handle); 222 223 if (!proc_pnp) 224 return -EIO; 225 if ( !pnpbios_dont_use_current_config ) { 226 ent = create_proc_entry(name, 0, proc_pnp); 227 if (ent) { 228 ent->read_proc = proc_read_node; 229 ent->write_proc = proc_write_node; 230 ent->data = (void *)(long)(node->handle); 231 } 232 } 233 234 if (!proc_pnp_boot) 235 return -EIO; 236 ent = create_proc_entry(name, 0, proc_pnp_boot); 237 if (ent) { 238 ent->read_proc = proc_read_node; 239 ent->write_proc = proc_write_node; 240 ent->data = (void *)(long)(node->handle+0x100); 241 return 0; 242 } 243 244 return -EIO; 245} 246 247/* 248 * When this is called, pnpbios functions are assumed to 249 * work and the pnpbios_dont_use_current_config flag 250 * should already have been set to the appropriate value 251 */ 252int __init pnpbios_proc_init( void ) 253{ 254 proc_pnp = proc_mkdir("pnp", proc_bus); 255 if (!proc_pnp) 256 return -EIO; 257 proc_pnp_boot = proc_mkdir("boot", proc_pnp); 258 if (!proc_pnp_boot) 259 return -EIO; 260 create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL); 261 create_proc_read_entry("configuration_info", 0, proc_pnp, proc_read_pnpconfig, NULL); 262 create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo, NULL); 263 create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL); 264 create_proc_read_entry("legacy_device_resources", 0, proc_pnp, proc_read_legacyres, NULL); 265 266 return 0; 267} 268 269void __exit pnpbios_proc_exit(void) 270{ 271 int i; 272 char name[3]; 273 274 if (!proc_pnp) 275 return; 276 277 for (i=0; i<0xff; i++) { 278 sprintf(name, "%02x", i); 279 if ( !pnpbios_dont_use_current_config ) 280 remove_proc_entry(name, proc_pnp); 281 remove_proc_entry(name, proc_pnp_boot); 282 } 283 remove_proc_entry("legacy_device_resources", proc_pnp); 284 remove_proc_entry("escd", proc_pnp); 285 remove_proc_entry("escd_info", proc_pnp); 286 remove_proc_entry("configuration_info", proc_pnp); 287 remove_proc_entry("devices", proc_pnp); 288 remove_proc_entry("boot", proc_pnp); 289 remove_proc_entry("pnp", proc_bus); 290 291 return; 292} 293