1 // SPDX-License-Identifier: GPL-2.0
3 * /proc/bus/pnp interface for Plug and Play devices
5 * Written by David Hinds, dahinds@users.sourceforge.net
6 * Modified by Thomas Hood
8 * The .../devices and .../<node> and .../boot/<node> files are
9 * utilized by the lspnp and setpnp utilities, supplied with the
11 * http://pcmcia-cs.sourceforge.net
13 * The .../escd file is utilized by the lsescd utility written by
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/pnp.h>
27 #include <linux/seq_file.h>
28 #include <linux/init.h>
30 #include <linux/uaccess.h>
34 static struct proc_dir_entry *proc_pnp = NULL;
35 static struct proc_dir_entry *proc_pnp_boot = NULL;
37 static int pnpconfig_proc_show(struct seq_file *m, void *v)
39 struct pnp_isa_config_struc pnps;
41 if (pnp_bios_isapnp_config(&pnps))
43 seq_printf(m, "structure_revision %d\n"
45 "ISA_read_data_port 0x%x\n",
46 pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
50 static int pnpconfig_proc_open(struct inode *inode, struct file *file)
52 return single_open(file, pnpconfig_proc_show, NULL);
55 static const struct file_operations pnpconfig_proc_fops = {
57 .open = pnpconfig_proc_open,
60 .release = single_release,
63 static int escd_info_proc_show(struct seq_file *m, void *v)
65 struct escd_info_struc escd;
67 if (pnp_bios_escd_info(&escd))
69 seq_printf(m, "min_ESCD_write_size %d\n"
72 escd.min_escd_write_size,
73 escd.escd_size, escd.nv_storage_base);
77 static int escd_info_proc_open(struct inode *inode, struct file *file)
79 return single_open(file, escd_info_proc_show, NULL);
82 static const struct file_operations escd_info_proc_fops = {
84 .open = escd_info_proc_open,
87 .release = single_release,
90 #define MAX_SANE_ESCD_SIZE (32*1024)
91 static int escd_proc_show(struct seq_file *m, void *v)
93 struct escd_info_struc escd;
97 if (pnp_bios_escd_info(&escd))
101 if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
103 "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
107 tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
111 if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
117 (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
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__);
127 seq_write(m, tmpbuf, escd_size);
132 static int escd_proc_open(struct inode *inode, struct file *file)
134 return single_open(file, escd_proc_show, NULL);
137 static const struct file_operations escd_proc_fops = {
138 .owner = THIS_MODULE,
139 .open = escd_proc_open,
142 .release = single_release,
145 static int pnp_legacyres_proc_show(struct seq_file *m, void *v)
149 buf = kmalloc(65536, GFP_KERNEL);
152 if (pnp_bios_get_stat_res(buf)) {
157 seq_write(m, buf, 65536);
162 static int pnp_legacyres_proc_open(struct inode *inode, struct file *file)
164 return single_open(file, pnp_legacyres_proc_show, NULL);
167 static const struct file_operations pnp_legacyres_proc_fops = {
168 .owner = THIS_MODULE,
169 .open = pnp_legacyres_proc_open,
172 .release = single_release,
175 static int pnp_devices_proc_show(struct seq_file *m, void *v)
177 struct pnp_bios_node *node;
180 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
184 for (nodenum = 0; nodenum < 0xff;) {
185 u8 thisnodenum = nodenum;
187 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
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) {
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);
205 static int pnp_devices_proc_open(struct inode *inode, struct file *file)
207 return single_open(file, pnp_devices_proc_show, NULL);
210 static const struct file_operations pnp_devices_proc_fops = {
211 .owner = THIS_MODULE,
212 .open = pnp_devices_proc_open,
215 .release = single_release,
218 static int pnpbios_proc_show(struct seq_file *m, void *v)
220 void *data = m->private;
221 struct pnp_bios_node *node;
222 int boot = (long)data >> 8;
223 u8 nodenum = (long)data;
226 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
229 if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
233 len = node->size - sizeof(struct pnp_bios_node);
234 seq_write(m, node->data, len);
239 static int pnpbios_proc_open(struct inode *inode, struct file *file)
241 return single_open(file, pnpbios_proc_show, PDE_DATA(inode));
244 static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
245 size_t count, loff_t *pos)
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;
253 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
256 if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
260 if (count != node->size - sizeof(struct pnp_bios_node)) {
264 if (copy_from_user(node->data, buf, count)) {
268 if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
278 static const struct file_operations pnpbios_proc_fops = {
279 .owner = THIS_MODULE,
280 .open = pnpbios_proc_open,
283 .release = single_release,
284 .write = pnpbios_proc_write,
287 int pnpbios_interface_attach_device(struct pnp_bios_node *node)
291 sprintf(name, "%02x", node->handle);
295 if (!pnpbios_dont_use_current_config) {
296 proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops,
297 (void *)(long)(node->handle));
302 if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops,
303 (void *)(long)(node->handle + 0x100)))
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
313 int __init pnpbios_proc_init(void)
315 proc_pnp = proc_mkdir("bus/pnp", NULL);
318 proc_pnp_boot = proc_mkdir("boot", proc_pnp);
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);
330 void __exit pnpbios_proc_exit(void)
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);
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);