aboutsummaryrefslogtreecommitdiff
path: root/drivers/pnp/pnpbios/proc.c
blob: 63ddb017345631d28ac45b84c764d23a94e5f068 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * /proc/bus/pnp interface for Plug and Play devices
 *
 * Written by David Hinds, dahinds@users.sourceforge.net
 * Modified by Thomas Hood
 *
 * The .../devices and .../<node> and .../boot/<node> files are
 * utilized by the lspnp and setpnp utilities, supplied with the
 * pcmcia-cs package.
 *     http://pcmcia-cs.sourceforge.net
 *
 * The .../escd file is utilized by the lsescd utility written by
 * Gunther Mayer.
 *
 * The .../legacy_device_resources file is not used yet.
 *
 * The other files are human-readable.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/pnp.h>
#include <linux/seq_file.h>
#include <linux/init.h>

#include <asm/uaccess.h>

#include "pnpbios.h"

static struct proc_dir_entry *proc_pnp = NULL;
static struct proc_dir_entry *proc_pnp_boot = NULL;

static int pnpconfig_proc_show(struct seq_file *m, void *v)
{
	struct pnp_isa_config_struc pnps;

	if (pnp_bios_isapnp_config(&pnps))
		return -EIO;
	seq_printf(m, "structure_revision %d\n"
		      "number_of_CSNs %d\n"
		      "ISA_read_data_port 0x%x\n",
		   pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
	return 0;
}

static int pnpconfig_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pnpconfig_proc_show, NULL);
}

static const struct file_operations pnpconfig_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pnpconfig_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int escd_info_proc_show(struct seq_file *m, void *v)
{
	struct escd_info_struc escd;

	if (pnp_bios_escd_info(&escd))
		return -EIO;
	seq_printf(m, "min_ESCD_write_size %d\n"
			"ESCD_size %d\n"
			"NVRAM_base 0x%x\n",
			escd.min_escd_write_size,
			escd.escd_size, escd.nv_storage_base);
	return 0;
}

static int escd_info_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, escd_info_proc_show, NULL);
}

static const struct file_operations escd_info_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= escd_info_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

#define MAX_SANE_ESCD_SIZE (32*1024)
static int escd_proc_show(struct seq_file *m, void *v)
{
	struct escd_info_struc escd;
	char *tmpbuf;
	int escd_size;

	if (pnp_bios_escd_info(&escd))
		return -EIO;

	/* sanity check */
	if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
		printk(KERN_ERR
		       "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
		return -EFBIG;
	}

	tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
	if (!tmpbuf)
		return -ENOMEM;

	if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
		kfree(tmpbuf);
		return -EIO;
	}

	escd_size =
	    (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;

	/* sanity check */
	if (escd_size > MAX_SANE_ESCD_SIZE) {
		printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by"
				" BIOS read_escd call is too great\n", __func__);
		kfree(tmpbuf);
		return -EFBIG;
	}

	seq_write(m, tmpbuf, escd_size);
	kfree(tmpbuf);
	return 0;
}

static int escd_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, escd_proc_show, NULL);
}

static const struct file_operations escd_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= escd_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int pnp_legacyres_proc_show(struct seq_file *m, void *v)
{
	void *buf;

	buf = kmalloc(65536, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	if (pnp_bios_get_stat_res(buf)) {
		kfree(buf);
		return -EIO;
	}

	seq_write(m, buf, 65536);
	kfree(buf);
	return 0;
}

static int pnp_legacyres_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pnp_legacyres_proc_show, NULL);
}

static const struct file_operations pnp_legacyres_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pnp_legacyres_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int pnp_devices_proc_show(struct seq_file *m, void *v)
{
	struct pnp_bios_node *node;
	u8 nodenum;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;

	for (nodenum = 0; nodenum < 0xff;) {
		u8 thisnodenum = nodenum;

		if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
			break;
		seq_printf(m, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
			     node->handle, node->eisa_id,
			     node->type_code[0], node->type_code[1],
			     node->type_code[2], node->flags);
		if (nodenum <= thisnodenum) {
			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);
			break;
		}
	}
	kfree(node);
	return 0;
}

static int pnp_devices_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pnp_devices_proc_show, NULL);
}

static const struct file_operations pnp_devices_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pnp_devices_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int pnpbios_proc_show(struct seq_file *m, void *v)
{
	void *data = m->private;
	struct pnp_bios_node *node;
	int boot = (long)data >> 8;
	u8 nodenum = (long)data;
	int len;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;
	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
		kfree(node);
		return -EIO;
	}
	len = node->size - sizeof(struct pnp_bios_node);
	seq_write(m, node->data, len);
	kfree(node);
	return 0;
}

static int pnpbios_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pnpbios_proc_show, PDE(inode)->data);
}

static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
				  size_t count, loff_t *pos)
{
	void *data = PDE(file_inode(file))->data;
	struct pnp_bios_node *node;
	int boot = (long)data >> 8;
	u8 nodenum = (long)data;
	int ret = count;

	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;
	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
		ret = -EIO;
		goto out;
	}
	if (count != node->size - sizeof(struct pnp_bios_node)) {
		ret = -EINVAL;
		goto out;
	}
	if (copy_from_user(node->data, buf, count)) {
		ret = -EFAULT;
		goto out;
	}
	if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
		ret = -EINVAL;
		goto out;
	}
	ret = count;
out:
	kfree(node);
	return ret;
}

static const struct file_operations pnpbios_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pnpbios_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= pnpbios_proc_write,
};

int pnpbios_interface_attach_device(struct pnp_bios_node *node)
{
	char name[3];

	sprintf(name, "%02x", node->handle);

	if (!proc_pnp)
		return -EIO;
	if (!pnpbios_dont_use_current_config) {
		proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops,
				 (void *)(long)(node->handle));
	}

	if (!proc_pnp_boot)
		return -EIO;
	if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops,
			     (void *)(long)(node->handle + 0x100)))
		return 0;
	return -EIO;
}

/*
 * When this is called, pnpbios functions are assumed to
 * work and the pnpbios_dont_use_current_config flag
 * should already have been set to the appropriate value
 */
int __init pnpbios_proc_init(void)
{
	proc_pnp = proc_mkdir("bus/pnp", NULL);
	if (!proc_pnp)
		return -EIO;
	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
	if (!proc_pnp_boot)
		return -EIO;
	proc_create("devices", 0, proc_pnp, &pnp_devices_proc_fops);
	proc_create("configuration_info", 0, proc_pnp, &pnpconfig_proc_fops);
	proc_create("escd_info", 0, proc_pnp, &escd_info_proc_fops);
	proc_create("escd", S_IRUSR, proc_pnp, &escd_proc_fops);
	proc_create("legacy_device_resources", 0, proc_pnp, &pnp_legacyres_proc_fops);

	return 0;
}

void __exit pnpbios_proc_exit(void)
{
	int i;
	char name[3];

	if (!proc_pnp)
		return;

	for (i = 0; i < 0xff; i++) {
		sprintf(name, "%02x", i);
		if (!pnpbios_dont_use_current_config)
			remove_proc_entry(name, proc_pnp);
		remove_proc_entry(name, proc_pnp_boot);
	}
	remove_proc_entry("legacy_device_resources", proc_pnp);
	remove_proc_entry("escd", proc_pnp);
	remove_proc_entry("escd_info", proc_pnp);
	remove_proc_entry("configuration_info", proc_pnp);
	remove_proc_entry("devices", proc_pnp);
	remove_proc_entry("boot", proc_pnp);
	remove_proc_entry("bus/pnp", NULL);
}