Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
dfd2e1b4 | 26 | #include <linux/pnp.h> |
1da177e4 LT |
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, | |
9dd78466 | 37 | int count, int *eof, void *data) |
1da177e4 LT |
38 | { |
39 | struct pnp_isa_config_struc pnps; | |
40 | ||
41 | if (pnp_bios_isapnp_config(&pnps)) | |
42 | return -EIO; | |
43 | return snprintf(buf, count, | |
9dd78466 BH |
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); | |
1da177e4 LT |
48 | } |
49 | ||
50 | static int proc_read_escdinfo(char *buf, char **start, off_t pos, | |
9dd78466 | 51 | int count, int *eof, void *data) |
1da177e4 LT |
52 | { |
53 | struct escd_info_struc escd; | |
54 | ||
55 | if (pnp_bios_escd_info(&escd)) | |
56 | return -EIO; | |
57 | return snprintf(buf, count, | |
9dd78466 BH |
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); | |
1da177e4 LT |
63 | } |
64 | ||
65 | #define MAX_SANE_ESCD_SIZE (32*1024) | |
66 | static int proc_read_escd(char *buf, char **start, off_t pos, | |
9dd78466 | 67 | int count, int *eof, void *data) |
1da177e4 LT |
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) { | |
9dd78466 BH |
78 | printk(KERN_ERR |
79 | "PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n"); | |
1da177e4 LT |
80 | return -EFBIG; |
81 | } | |
82 | ||
cd861280 | 83 | tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL); |
9dd78466 BH |
84 | if (!tmpbuf) |
85 | return -ENOMEM; | |
1da177e4 LT |
86 | |
87 | if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) { | |
88 | kfree(tmpbuf); | |
89 | return -EIO; | |
90 | } | |
91 | ||
9dd78466 BH |
92 | escd_size = |
93 | (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256; | |
1da177e4 LT |
94 | |
95 | /* sanity check */ | |
96 | if (escd_size > MAX_SANE_ESCD_SIZE) { | |
a8b0ac08 JJ |
97 | printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by" |
98 | " BIOS read_escd call is too great\n"); | |
99 | kfree(tmpbuf); | |
1da177e4 LT |
100 | return -EFBIG; |
101 | } | |
102 | ||
103 | escd_left_to_read = escd_size - pos; | |
9dd78466 BH |
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); | |
1da177e4 LT |
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, | |
9dd78466 | 116 | int count, int *eof, void *data) |
1da177e4 LT |
117 | { |
118 | /* Assume that the following won't overflow the buffer */ | |
9dd78466 | 119 | if (pnp_bios_get_stat_res(buf)) |
1da177e4 LT |
120 | return -EIO; |
121 | ||
9dd78466 | 122 | return count; // FIXME: Return actual length |
1da177e4 LT |
123 | } |
124 | ||
125 | static int proc_read_devices(char *buf, char **start, off_t pos, | |
9dd78466 | 126 | int count, int *eof, void *data) |
1da177e4 LT |
127 | { |
128 | struct pnp_bios_node *node; | |
129 | u8 nodenum; | |
130 | char *p = buf; | |
131 | ||
132 | if (pos >= 0xff) | |
133 | return 0; | |
134 | ||
cd861280 | 135 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
9dd78466 BH |
136 | if (!node) |
137 | return -ENOMEM; | |
1da177e4 | 138 | |
9dd78466 | 139 | for (nodenum = pos; nodenum < 0xff;) { |
1da177e4 LT |
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) { | |
9dd78466 BH |
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); | |
1da177e4 LT |
156 | *eof = 1; |
157 | break; | |
158 | } | |
159 | } | |
160 | kfree(node); | |
161 | if (nodenum == 0xff) | |
162 | *eof = 1; | |
9dd78466 | 163 | *start = (char *)((off_t) nodenum - pos); |
1da177e4 LT |
164 | return p - buf; |
165 | } | |
166 | ||
167 | static int proc_read_node(char *buf, char **start, off_t pos, | |
9dd78466 | 168 | int count, int *eof, void *data) |
1da177e4 LT |
169 | { |
170 | struct pnp_bios_node *node; | |
171 | int boot = (long)data >> 8; | |
172 | u8 nodenum = (long)data; | |
173 | int len; | |
174 | ||
cd861280 | 175 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
9dd78466 BH |
176 | if (!node) |
177 | return -ENOMEM; | |
1da177e4 LT |
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 | ||
9dd78466 BH |
188 | static int proc_write_node(struct file *file, const char __user * buf, |
189 | unsigned long count, void *data) | |
1da177e4 LT |
190 | { |
191 | struct pnp_bios_node *node; | |
192 | int boot = (long)data >> 8; | |
193 | u8 nodenum = (long)data; | |
194 | int ret = count; | |
195 | ||
cd861280 | 196 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
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; | |
1e0aa9ad | 216 | out: |
1da177e4 LT |
217 | kfree(node); |
218 | return ret; | |
219 | } | |
220 | ||
9dd78466 | 221 | int pnpbios_interface_attach_device(struct pnp_bios_node *node) |
1da177e4 LT |
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; | |
9dd78466 | 230 | if (!pnpbios_dont_use_current_config) { |
1da177e4 LT |
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; | |
9dd78466 | 245 | ent->data = (void *)(long)(node->handle + 0x100); |
1da177e4 LT |
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 | */ | |
9dd78466 | 257 | int __init pnpbios_proc_init(void) |
1da177e4 | 258 | { |
9c37066d | 259 | proc_pnp = proc_mkdir("bus/pnp", NULL); |
1da177e4 LT |
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); | |
9dd78466 BH |
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); | |
1da177e4 | 270 | create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL); |
9dd78466 BH |
271 | create_proc_read_entry("legacy_device_resources", 0, proc_pnp, |
272 | proc_read_legacyres, NULL); | |
1da177e4 LT |
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 | ||
9dd78466 | 285 | for (i = 0; i < 0xff; i++) { |
1da177e4 | 286 | sprintf(name, "%02x", i); |
9dd78466 | 287 | if (!pnpbios_dont_use_current_config) |
1da177e4 LT |
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); | |
9c37066d | 297 | remove_proc_entry("bus/pnp", NULL); |
1da177e4 | 298 | } |