blob: c212db0fc65de583e749d7cabaac54a2849133a6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 *
15 * The .../legacy_device_resources file is not used yet.
16 *
17 * The other files are human-readable.
18 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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>
Bjorn Helgaasdfd2e1b2008-04-28 16:34:42 -060025#include <linux/pnp.h>
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080026#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/init.h>
28
29#include <asm/uaccess.h>
30
31#include "pnpbios.h"
32
33static struct proc_dir_entry *proc_pnp = NULL;
34static struct proc_dir_entry *proc_pnp_boot = NULL;
35
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080036static int pnpconfig_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 struct pnp_isa_config_struc pnps;
39
40 if (pnp_bios_isapnp_config(&pnps))
41 return -EIO;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080042 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080049static int pnpconfig_proc_open(struct inode *inode, struct file *file)
50{
51 return single_open(file, pnpconfig_proc_show, NULL);
52}
53
54static 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
62static int escd_info_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 struct escd_info_struc escd;
65
66 if (pnp_bios_escd_info(&escd))
67 return -EIO;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080068 seq_printf(m, "min_ESCD_write_size %d\n"
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070069 "ESCD_size %d\n"
70 "NVRAM_base 0x%x\n",
71 escd.min_escd_write_size,
72 escd.escd_size, escd.nv_storage_base);
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080073 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074}
75
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080076static int escd_info_proc_open(struct inode *inode, struct file *file)
77{
78 return single_open(file, escd_info_proc_show, NULL);
79}
80
81static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#define MAX_SANE_ESCD_SIZE (32*1024)
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080090static int escd_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 struct escd_info_struc escd;
93 char *tmpbuf;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -080094 int escd_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 if (pnp_bios_escd_info(&escd))
97 return -EIO;
98
99 /* sanity check */
100 if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700101 printk(KERN_ERR
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800102 "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return -EFBIG;
104 }
105
Robert P. J. Daycd861282006-12-13 00:34:52 -0800106 tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700107 if (!tmpbuf)
108 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
111 kfree(tmpbuf);
112 return -EIO;
113 }
114
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700115 escd_size =
116 (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 /* sanity check */
119 if (escd_size > MAX_SANE_ESCD_SIZE) {
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800120 printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by"
121 " BIOS read_escd call is too great\n", __func__);
Jesper Juhla8b0ac02007-10-16 23:26:56 -0700122 kfree(tmpbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return -EFBIG;
124 }
125
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800126 seq_write(m, tmpbuf, escd_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 kfree(tmpbuf);
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800128 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800131static int escd_proc_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800133 return single_open(file, escd_proc_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800136static 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
144static 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
161static int pnp_legacyres_proc_open(struct inode *inode, struct file *file)
162{
163 return single_open(file, pnp_legacyres_proc_show, NULL);
164}
165
166static 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
174static int pnp_devices_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 struct pnp_bios_node *node;
177 u8 nodenum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Robert P. J. Daycd861282006-12-13 00:34:52 -0800179 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700180 if (!node)
181 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800183 for (nodenum = 0; nodenum < 0xff;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 u8 thisnodenum = nodenum;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
187 break;
Andy Shevchenkoac2a5092013-04-23 16:37:19 +0300188 seq_printf(m, "%02x\t%08x\t%3phC\t%04x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 node->handle, node->eisa_id,
Andy Shevchenkoac2a5092013-04-23 16:37:19 +0300190 node->type_code, node->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (nodenum <= thisnodenum) {
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700192 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 break;
198 }
199 }
200 kfree(node);
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800201 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800204static int pnp_devices_proc_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800206 return single_open(file, pnp_devices_proc_show, NULL);
207}
208
209static 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
217static int pnpbios_proc_show(struct seq_file *m, void *v)
218{
219 void *data = m->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 struct pnp_bios_node *node;
221 int boot = (long)data >> 8;
222 u8 nodenum = (long)data;
223 int len;
224
Robert P. J. Daycd861282006-12-13 00:34:52 -0800225 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700226 if (!node)
227 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 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);
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800233 seq_write(m, node->data, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 kfree(node);
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800235 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800238static int pnpbios_proc_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
Al Virod9dda782013-03-31 18:16:14 -0400240 return single_open(file, pnpbios_proc_show, PDE_DATA(inode));
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800241}
242
243static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
244 size_t count, loff_t *pos)
245{
Al Virod9dda782013-03-31 18:16:14 -0400246 void *data = PDE_DATA(file_inode(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 struct pnp_bios_node *node;
248 int boot = (long)data >> 8;
249 u8 nodenum = (long)data;
250 int ret = count;
251
Robert P. J. Daycd861282006-12-13 00:34:52 -0800252 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 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;
Bjorn Helgaas1e0aa9a2007-08-15 10:32:08 -0600272out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 kfree(node);
274 return ret;
275}
276
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800277static 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
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700286int pnpbios_interface_attach_device(struct pnp_bios_node *node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
288 char name[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 sprintf(name, "%02x", node->handle);
291
292 if (!proc_pnp)
293 return -EIO;
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700294 if (!pnpbios_dont_use_current_config) {
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800295 proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops,
296 (void *)(long)(node->handle));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 }
298
299 if (!proc_pnp_boot)
300 return -EIO;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800301 if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops,
302 (void *)(long)(node->handle + 0x100)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 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 */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700312int __init pnpbios_proc_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Alexey Dobriyan9c370662008-04-29 01:01:41 -0700314 proc_pnp = proc_mkdir("bus/pnp", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (!proc_pnp)
316 return -EIO;
317 proc_pnp_boot = proc_mkdir("boot", proc_pnp);
318 if (!proc_pnp_boot)
319 return -EIO;
Alexey Dobriyan5116fa2b2009-12-15 16:46:47 -0800320 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326 return 0;
327}
328
329void __exit pnpbios_proc_exit(void)
330{
331 int i;
332 char name[3];
333
334 if (!proc_pnp)
335 return;
336
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700337 for (i = 0; i < 0xff; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 sprintf(name, "%02x", i);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700339 if (!pnpbios_dont_use_current_config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 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);
Alexey Dobriyan9c370662008-04-29 01:01:41 -0700349 remove_proc_entry("bus/pnp", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}