Merge commit 'kumar/kumar-next' into next
[linux-2.6] / drivers / pnp / pnpbios / proc.c
1 /*
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.
14  *     http://home.t-online.de/home/gunther.mayer/lsescd
15  *
16  * The .../legacy_device_resources file is not used yet.
17  *
18  * The other files are human-readable.
19  */
20
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/init.h>
28
29 #include <asm/uaccess.h>
30
31 #include "pnpbios.h"
32
33 static struct proc_dir_entry *proc_pnp = NULL;
34 static struct proc_dir_entry *proc_pnp_boot = NULL;
35
36 static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
37                                int count, int *eof, void *data)
38 {
39         struct pnp_isa_config_struc pnps;
40
41         if (pnp_bios_isapnp_config(&pnps))
42                 return -EIO;
43         return snprintf(buf, count,
44                         "structure_revision %d\n"
45                         "number_of_CSNs %d\n"
46                         "ISA_read_data_port 0x%x\n",
47                         pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
48 }
49
50 static int proc_read_escdinfo(char *buf, char **start, off_t pos,
51                               int count, int *eof, void *data)
52 {
53         struct escd_info_struc escd;
54
55         if (pnp_bios_escd_info(&escd))
56                 return -EIO;
57         return snprintf(buf, count,
58                         "min_ESCD_write_size %d\n"
59                         "ESCD_size %d\n"
60                         "NVRAM_base 0x%x\n",
61                         escd.min_escd_write_size,
62                         escd.escd_size, escd.nv_storage_base);
63 }
64
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)
68 {
69         struct escd_info_struc escd;
70         char *tmpbuf;
71         int escd_size, escd_left_to_read, n;
72
73         if (pnp_bios_escd_info(&escd))
74                 return -EIO;
75
76         /* sanity check */
77         if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
78                 printk(KERN_ERR
79                        "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
80                 return -EFBIG;
81         }
82
83         tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
84         if (!tmpbuf)
85                 return -ENOMEM;
86
87         if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
88                 kfree(tmpbuf);
89                 return -EIO;
90         }
91
92         escd_size =
93             (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
94
95         /* sanity check */
96         if (escd_size > MAX_SANE_ESCD_SIZE) {
97                 printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by"
98                                 " BIOS read_escd call is too great\n");
99                 kfree(tmpbuf);
100                 return -EFBIG;
101         }
102
103         escd_left_to_read = escd_size - pos;
104         if (escd_left_to_read < 0)
105                 escd_left_to_read = 0;
106         if (escd_left_to_read == 0)
107                 *eof = 1;
108         n = min(count, escd_left_to_read);
109         memcpy(buf, tmpbuf + pos, n);
110         kfree(tmpbuf);
111         *start = buf;
112         return n;
113 }
114
115 static int proc_read_legacyres(char *buf, char **start, off_t pos,
116                                int count, int *eof, void *data)
117 {
118         /* Assume that the following won't overflow the buffer */
119         if (pnp_bios_get_stat_res(buf))
120                 return -EIO;
121
122         return count;           // FIXME: Return actual length
123 }
124
125 static int proc_read_devices(char *buf, char **start, off_t pos,
126                              int count, int *eof, void *data)
127 {
128         struct pnp_bios_node *node;
129         u8 nodenum;
130         char *p = buf;
131
132         if (pos >= 0xff)
133                 return 0;
134
135         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
136         if (!node)
137                 return -ENOMEM;
138
139         for (nodenum = pos; nodenum < 0xff;) {
140                 u8 thisnodenum = nodenum;
141                 /* 26 = the number of characters per line sprintf'ed */
142                 if ((p - buf + 26) > count)
143                         break;
144                 if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
145                         break;
146                 p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
147                              node->handle, node->eisa_id,
148                              node->type_code[0], node->type_code[1],
149                              node->type_code[2], node->flags);
150                 if (nodenum <= thisnodenum) {
151                         printk(KERN_ERR
152                                "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
153                                "PnPBIOS: proc_read_devices:",
154                                (unsigned int)nodenum,
155                                (unsigned int)thisnodenum);
156                         *eof = 1;
157                         break;
158                 }
159         }
160         kfree(node);
161         if (nodenum == 0xff)
162                 *eof = 1;
163         *start = (char *)((off_t) nodenum - pos);
164         return p - buf;
165 }
166
167 static int proc_read_node(char *buf, char **start, off_t pos,
168                           int count, int *eof, void *data)
169 {
170         struct pnp_bios_node *node;
171         int boot = (long)data >> 8;
172         u8 nodenum = (long)data;
173         int len;
174
175         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
176         if (!node)
177                 return -ENOMEM;
178         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
179                 kfree(node);
180                 return -EIO;
181         }
182         len = node->size - sizeof(struct pnp_bios_node);
183         memcpy(buf, node->data, len);
184         kfree(node);
185         return len;
186 }
187
188 static int proc_write_node(struct file *file, const char __user * buf,
189                            unsigned long count, void *data)
190 {
191         struct pnp_bios_node *node;
192         int boot = (long)data >> 8;
193         u8 nodenum = (long)data;
194         int ret = count;
195
196         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
197         if (!node)
198                 return -ENOMEM;
199         if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
200                 ret = -EIO;
201                 goto out;
202         }
203         if (count != node->size - sizeof(struct pnp_bios_node)) {
204                 ret = -EINVAL;
205                 goto out;
206         }
207         if (copy_from_user(node->data, buf, count)) {
208                 ret = -EFAULT;
209                 goto out;
210         }
211         if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
212                 ret = -EINVAL;
213                 goto out;
214         }
215         ret = count;
216 out:
217         kfree(node);
218         return ret;
219 }
220
221 int pnpbios_interface_attach_device(struct pnp_bios_node *node)
222 {
223         char name[3];
224         struct proc_dir_entry *ent;
225
226         sprintf(name, "%02x", node->handle);
227
228         if (!proc_pnp)
229                 return -EIO;
230         if (!pnpbios_dont_use_current_config) {
231                 ent = create_proc_entry(name, 0, proc_pnp);
232                 if (ent) {
233                         ent->read_proc = proc_read_node;
234                         ent->write_proc = proc_write_node;
235                         ent->data = (void *)(long)(node->handle);
236                 }
237         }
238
239         if (!proc_pnp_boot)
240                 return -EIO;
241         ent = create_proc_entry(name, 0, proc_pnp_boot);
242         if (ent) {
243                 ent->read_proc = proc_read_node;
244                 ent->write_proc = proc_write_node;
245                 ent->data = (void *)(long)(node->handle + 0x100);
246                 return 0;
247         }
248
249         return -EIO;
250 }
251
252 /*
253  * When this is called, pnpbios functions are assumed to
254  * work and the pnpbios_dont_use_current_config flag
255  * should already have been set to the appropriate value
256  */
257 int __init pnpbios_proc_init(void)
258 {
259         proc_pnp = proc_mkdir("bus/pnp", NULL);
260         if (!proc_pnp)
261                 return -EIO;
262         proc_pnp_boot = proc_mkdir("boot", proc_pnp);
263         if (!proc_pnp_boot)
264                 return -EIO;
265         create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
266         create_proc_read_entry("configuration_info", 0, proc_pnp,
267                                proc_read_pnpconfig, NULL);
268         create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
269                                NULL);
270         create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
271         create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
272                                proc_read_legacyres, NULL);
273
274         return 0;
275 }
276
277 void __exit pnpbios_proc_exit(void)
278 {
279         int i;
280         char name[3];
281
282         if (!proc_pnp)
283                 return;
284
285         for (i = 0; i < 0xff; i++) {
286                 sprintf(name, "%02x", i);
287                 if (!pnpbios_dont_use_current_config)
288                         remove_proc_entry(name, proc_pnp);
289                 remove_proc_entry(name, proc_pnp_boot);
290         }
291         remove_proc_entry("legacy_device_resources", proc_pnp);
292         remove_proc_entry("escd", proc_pnp);
293         remove_proc_entry("escd_info", proc_pnp);
294         remove_proc_entry("configuration_info", proc_pnp);
295         remove_proc_entry("devices", proc_pnp);
296         remove_proc_entry("boot", proc_pnp);
297         remove_proc_entry("bus/pnp", NULL);
298 }