2 * /proc/bus/pnp interface for Plug and Play devices
4 * Written by David Hinds, dahinds@users.sourceforge.net
5 * Modified by Thomas Hood
7 * The .../devices and .../<node> and .../boot/<node> files are
8 * utilized by the lspnp and setpnp utilities, supplied with the
10 * http://pcmcia-cs.sourceforge.net
12 * The .../escd file is utilized by the lsescd utility written by
14 * http://home.t-online.de/home/gunther.mayer/lsescd
16 * The .../legacy_device_resources file is not used yet.
18 * The other files are human-readable.
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/pnpbios.h>
27 #include <linux/init.h>
29 #include <asm/uaccess.h>
33 static struct proc_dir_entry *proc_pnp = NULL;
34 static struct proc_dir_entry *proc_pnp_boot = NULL;
36 static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
37 int count, int *eof, void *data)
39 struct pnp_isa_config_struc pnps;
41 if (pnp_bios_isapnp_config(&pnps))
43 return snprintf(buf, count,
44 "structure_revision %d\n"
46 "ISA_read_data_port 0x%x\n",
47 pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
50 static int proc_read_escdinfo(char *buf, char **start, off_t pos,
51 int count, int *eof, void *data)
53 struct escd_info_struc escd;
55 if (pnp_bios_escd_info(&escd))
57 return snprintf(buf, count,
58 "min_ESCD_write_size %d\n"
61 escd.min_escd_write_size,
62 escd.escd_size, escd.nv_storage_base);
65 #define MAX_SANE_ESCD_SIZE (32*1024)
66 static int proc_read_escd(char *buf, char **start, off_t pos,
67 int count, int *eof, void *data)
69 struct escd_info_struc escd;
71 int escd_size, escd_left_to_read, n;
73 if (pnp_bios_escd_info(&escd))
77 if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
79 "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
83 tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
87 if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
93 (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
96 if (escd_size > MAX_SANE_ESCD_SIZE) {
98 "PnPBIOS: proc_read_escd: ESCD size reported by BIOS read_escd call is too great\n");
102 escd_left_to_read = escd_size - pos;
103 if (escd_left_to_read < 0)
104 escd_left_to_read = 0;
105 if (escd_left_to_read == 0)
107 n = min(count, escd_left_to_read);
108 memcpy(buf, tmpbuf + pos, n);
114 static int proc_read_legacyres(char *buf, char **start, off_t pos,
115 int count, int *eof, void *data)
117 /* Assume that the following won't overflow the buffer */
118 if (pnp_bios_get_stat_res(buf))
121 return count; // FIXME: Return actual length
124 static int proc_read_devices(char *buf, char **start, off_t pos,
125 int count, int *eof, void *data)
127 struct pnp_bios_node *node;
134 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
138 for (nodenum = pos; nodenum < 0xff;) {
139 u8 thisnodenum = nodenum;
140 /* 26 = the number of characters per line sprintf'ed */
141 if ((p - buf + 26) > count)
143 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
145 p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
146 node->handle, node->eisa_id,
147 node->type_code[0], node->type_code[1],
148 node->type_code[2], node->flags);
149 if (nodenum <= thisnodenum) {
151 "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
152 "PnPBIOS: proc_read_devices:",
153 (unsigned int)nodenum,
154 (unsigned int)thisnodenum);
162 *start = (char *)((off_t) nodenum - pos);
166 static int proc_read_node(char *buf, char **start, off_t pos,
167 int count, int *eof, void *data)
169 struct pnp_bios_node *node;
170 int boot = (long)data >> 8;
171 u8 nodenum = (long)data;
174 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
177 if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
181 len = node->size - sizeof(struct pnp_bios_node);
182 memcpy(buf, node->data, len);
187 static int proc_write_node(struct file *file, const char __user * buf,
188 unsigned long count, void *data)
190 struct pnp_bios_node *node;
191 int boot = (long)data >> 8;
192 u8 nodenum = (long)data;
195 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
198 if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
202 if (count != node->size - sizeof(struct pnp_bios_node)) {
206 if (copy_from_user(node->data, buf, count)) {
210 if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
220 int pnpbios_interface_attach_device(struct pnp_bios_node *node)
223 struct proc_dir_entry *ent;
225 sprintf(name, "%02x", node->handle);
229 if (!pnpbios_dont_use_current_config) {
230 ent = create_proc_entry(name, 0, proc_pnp);
232 ent->read_proc = proc_read_node;
233 ent->write_proc = proc_write_node;
234 ent->data = (void *)(long)(node->handle);
240 ent = create_proc_entry(name, 0, proc_pnp_boot);
242 ent->read_proc = proc_read_node;
243 ent->write_proc = proc_write_node;
244 ent->data = (void *)(long)(node->handle + 0x100);
252 * When this is called, pnpbios functions are assumed to
253 * work and the pnpbios_dont_use_current_config flag
254 * should already have been set to the appropriate value
256 int __init pnpbios_proc_init(void)
258 proc_pnp = proc_mkdir("pnp", proc_bus);
261 proc_pnp_boot = proc_mkdir("boot", proc_pnp);
264 create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
265 create_proc_read_entry("configuration_info", 0, proc_pnp,
266 proc_read_pnpconfig, NULL);
267 create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
269 create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
270 create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
271 proc_read_legacyres, NULL);
276 void __exit pnpbios_proc_exit(void)
284 for (i = 0; i < 0xff; i++) {
285 sprintf(name, "%02x", i);
286 if (!pnpbios_dont_use_current_config)
287 remove_proc_entry(name, proc_pnp);
288 remove_proc_entry(name, proc_pnp_boot);
290 remove_proc_entry("legacy_device_resources", proc_pnp);
291 remove_proc_entry("escd", proc_pnp);
292 remove_proc_entry("escd_info", proc_pnp);
293 remove_proc_entry("configuration_info", proc_pnp);
294 remove_proc_entry("devices", proc_pnp);
295 remove_proc_entry("boot", proc_pnp);
296 remove_proc_entry("pnp", proc_bus);