aboutsummaryrefslogtreecommitdiff
path: root/drivers/pnp/pnpbios/proc.c
blob: 4f89f1677e69371760b74163289f3d82971bf86f (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
/*
 * /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.
 *     http://home.t-online.de/home/gunther.mayer/lsescd
 *
 * 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/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 proc_read_pnpconfig(char *buf, char **start, off_t pos,
			       int count, int *eof, void *data)
{
	struct pnp_isa_config_struc pnps;

	if (pnp_bios_isapnp_config(&pnps))
		return -EIO;
	return snprintf(buf, count,
			"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);
}

static int proc_read_escdinfo(char *buf, char **start, off_t pos,
			      int count, int *eof, void *data)
{
	struct escd_info_struc escd;

	if (pnp_bios_escd_info(&escd))
		return -EIO;
	return snprintf(buf, count,
			"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);
}

#define MAX_SANE_ESCD_SIZE (32*1024)
static int proc_read_escd(char *buf, char **start, off_t pos,
			  int count, int *eof, void *data)
{
	struct escd_info_struc escd;
	char *tmpbuf;
	int escd_size, escd_left_to_read, n;

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

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

	escd_left_to_read = escd_size - pos;
	if (escd_left_to_read < 0)
		escd_left_to_read = 0;
	if (escd_left_to_read == 0)
		*eof = 1;
	n = min(count, escd_left_to_read);
	memcpy(buf, tmpbuf + pos, n);
	kfree(tmpbuf);
	*start = buf;
	return n;
}

static int proc_read_legacyres(char *buf, char **start, off_t pos,
			       int count, int *eof, void *data)
{
	/* Assume that the following won't overflow the buffer */
	if (pnp_bios_get_stat_res(buf))
		return -EIO;

	return count;		// FIXME: Return actual length
}

static int proc_read_devices(char *buf, char **start, off_t pos,
			     int count, int *eof, void *data)
{
	struct pnp_bios_node *node;
	u8 nodenum;
	char *p = buf;

	if (pos >= 0xff)
		return 0;

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

	for (nodenum = pos; nodenum < 0xff;) {
		u8 thisnodenum = nodenum;
		/* 26 = the number of characters per line sprintf'ed */
		if ((p - buf + 26) > count)
			break;
		if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
			break;
		p += sprintf(p, "%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);
			*eof = 1;
			break;
		}
	}
	kfree(node);
	if (nodenum == 0xff)
		*eof = 1;
	*start = (char *)((off_t) nodenum - pos);
	return p - buf;
}

static int proc_read_node(char *buf, char **start, off_t pos,
			  int count, int *eof, void *data)
{
	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);
	memcpy(buf, node->data, len);
	kfree(node);
	return len;
}

static int proc_write_node(struct file *file, const char __user * buf,
			   unsigned long count, void *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;
}

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

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

	if (!proc_pnp)
		return -EIO;
	if (!pnpbios_dont_use_current_config) {
		ent = create_proc_entry(name, 0, proc_pnp);
		if (ent) {
			ent->read_proc = proc_read_node;
			ent->write_proc = proc_write_node;
			ent->data = (void *)(long)(node->handle);
		}
	}

	if (!proc_pnp_boot)
		return -EIO;
	ent = create_proc_entry(name, 0, proc_pnp_boot);
	if (ent) {
		ent->read_proc = proc_read_node;
		ent->write_proc = proc_write_node;
		ent->data = (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("pnp", proc_bus);
	if (!proc_pnp)
		return -EIO;
	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
	if (!proc_pnp_boot)
		return -EIO;
	create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
	create_proc_read_entry("configuration_info", 0, proc_pnp,
			       proc_read_pnpconfig, NULL);
	create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
			       NULL);
	create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
	create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
			       proc_read_legacyres, NULL);

	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("pnp", proc_bus);
}