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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux/SPARC PROM Configuration Driver | |
3 | * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu) | |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
5 | * | |
6 | * This character device driver allows user programs to access the | |
7 | * PROM device tree. It is compatible with the SunOS /dev/openprom | |
8 | * driver and the NetBSD /dev/openprom driver. The SunOS eeprom | |
9 | * utility works without any modifications. | |
10 | * | |
11 | * The driver uses a minor number under the misc device major. The | |
12 | * file read/write mode determines the type of access to the PROM. | |
13 | * Interrupts are disabled whenever the driver calls into the PROM for | |
14 | * sanity's sake. | |
15 | */ | |
16 | ||
17 | /* This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License as | |
19 | * published by the Free Software Foundation; either version 2 of the | |
20 | * License, or (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | */ | |
31 | ||
1da177e4 LT |
32 | #include <linux/module.h> |
33 | #include <linux/kernel.h> | |
1da177e4 LT |
34 | #include <linux/errno.h> |
35 | #include <linux/slab.h> | |
7bcc3209 | 36 | #include <linux/smp_lock.h> |
1da177e4 LT |
37 | #include <linux/string.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/fs.h> | |
41 | #include <asm/oplib.h> | |
8e48aec7 | 42 | #include <asm/prom.h> |
1da177e4 LT |
43 | #include <asm/system.h> |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/openpromio.h> | |
46 | #ifdef CONFIG_PCI | |
47 | #include <linux/pci.h> | |
1da177e4 LT |
48 | #endif |
49 | ||
8e48aec7 DM |
50 | MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost (ecd@skynet.be)"); |
51 | MODULE_DESCRIPTION("OPENPROM Configuration Driver"); | |
52 | MODULE_LICENSE("GPL"); | |
53 | MODULE_VERSION("1.0"); | |
54 | ||
1da177e4 LT |
55 | /* Private data kept by the driver for each descriptor. */ |
56 | typedef struct openprom_private_data | |
57 | { | |
8e48aec7 DM |
58 | struct device_node *current_node; /* Current node for SunOS ioctls. */ |
59 | struct device_node *lastnode; /* Last valid node used by BSD ioctls. */ | |
1da177e4 LT |
60 | } DATA; |
61 | ||
62 | /* ID of the PROM node containing all of the EEPROM options. */ | |
8e48aec7 | 63 | static struct device_node *options_node; |
1da177e4 LT |
64 | |
65 | /* | |
66 | * Copy an openpromio structure into kernel space from user space. | |
67 | * This routine does error checking to make sure that all memory | |
68 | * accesses are within bounds. A pointer to the allocated openpromio | |
69 | * structure will be placed in "*opp_p". Return value is the length | |
70 | * of the user supplied buffer. | |
71 | */ | |
72 | static int copyin(struct openpromio __user *info, struct openpromio **opp_p) | |
73 | { | |
74 | unsigned int bufsize; | |
75 | ||
76 | if (!info || !opp_p) | |
77 | return -EFAULT; | |
78 | ||
79 | if (get_user(bufsize, &info->oprom_size)) | |
80 | return -EFAULT; | |
81 | ||
82 | if (bufsize == 0) | |
83 | return -EINVAL; | |
84 | ||
85 | /* If the bufsize is too large, just limit it. | |
86 | * Fix from Jason Rappleye. | |
87 | */ | |
88 | if (bufsize > OPROMMAXPARAM) | |
89 | bufsize = OPROMMAXPARAM; | |
90 | ||
8e48aec7 | 91 | if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL))) |
1da177e4 | 92 | return -ENOMEM; |
1da177e4 LT |
93 | |
94 | if (copy_from_user(&(*opp_p)->oprom_array, | |
95 | &info->oprom_array, bufsize)) { | |
96 | kfree(*opp_p); | |
97 | return -EFAULT; | |
98 | } | |
99 | return bufsize; | |
100 | } | |
101 | ||
102 | static int getstrings(struct openpromio __user *info, struct openpromio **opp_p) | |
103 | { | |
104 | int n, bufsize; | |
105 | char c; | |
106 | ||
107 | if (!info || !opp_p) | |
108 | return -EFAULT; | |
109 | ||
8e48aec7 | 110 | if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL))) |
1da177e4 LT |
111 | return -ENOMEM; |
112 | ||
1da177e4 LT |
113 | (*opp_p)->oprom_size = 0; |
114 | ||
115 | n = bufsize = 0; | |
116 | while ((n < 2) && (bufsize < OPROMMAXPARAM)) { | |
117 | if (get_user(c, &info->oprom_array[bufsize])) { | |
118 | kfree(*opp_p); | |
119 | return -EFAULT; | |
120 | } | |
121 | if (c == '\0') | |
122 | n++; | |
123 | (*opp_p)->oprom_array[bufsize++] = c; | |
124 | } | |
125 | if (!n) { | |
126 | kfree(*opp_p); | |
127 | return -EINVAL; | |
128 | } | |
129 | return bufsize; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Copy an openpromio structure in kernel space back to user space. | |
134 | */ | |
135 | static int copyout(void __user *info, struct openpromio *opp, int len) | |
136 | { | |
137 | if (copy_to_user(info, opp, len)) | |
138 | return -EFAULT; | |
139 | return 0; | |
140 | } | |
141 | ||
8e48aec7 DM |
142 | static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize) |
143 | { | |
ccf0dec6 | 144 | const void *pval; |
8e48aec7 DM |
145 | int len; |
146 | ||
b9b64e6e DM |
147 | if (!dp || |
148 | !(pval = of_get_property(dp, op->oprom_array, &len)) || | |
149 | len <= 0 || len > bufsize) | |
8e48aec7 DM |
150 | return copyout(argp, op, sizeof(int)); |
151 | ||
152 | memcpy(op->oprom_array, pval, len); | |
153 | op->oprom_array[len] = '\0'; | |
154 | op->oprom_size = len; | |
155 | ||
156 | return copyout(argp, op, sizeof(int) + bufsize); | |
157 | } | |
158 | ||
159 | static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize) | |
160 | { | |
161 | struct property *prop; | |
162 | int len; | |
163 | ||
b9b64e6e DM |
164 | if (!dp) |
165 | return copyout(argp, op, sizeof(int)); | |
8e48aec7 DM |
166 | if (op->oprom_array[0] == '\0') { |
167 | prop = dp->properties; | |
168 | if (!prop) | |
169 | return copyout(argp, op, sizeof(int)); | |
170 | len = strlen(prop->name); | |
171 | } else { | |
172 | prop = of_find_property(dp, op->oprom_array, NULL); | |
173 | ||
174 | if (!prop || | |
175 | !prop->next || | |
176 | (len = strlen(prop->next->name)) + 1 > bufsize) | |
177 | return copyout(argp, op, sizeof(int)); | |
178 | ||
179 | prop = prop->next; | |
180 | } | |
181 | ||
182 | memcpy(op->oprom_array, prop->name, len); | |
183 | op->oprom_array[len] = '\0'; | |
184 | op->oprom_size = ++len; | |
185 | ||
186 | return copyout(argp, op, sizeof(int) + bufsize); | |
187 | } | |
188 | ||
189 | static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize) | |
190 | { | |
191 | char *buf = op->oprom_array + strlen(op->oprom_array) + 1; | |
192 | int len = op->oprom_array + bufsize - buf; | |
193 | ||
194 | return of_set_property(options_node, op->oprom_array, buf, len); | |
195 | } | |
196 | ||
197 | static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data) | |
198 | { | |
199 | phandle ph; | |
200 | ||
201 | BUILD_BUG_ON(sizeof(phandle) != sizeof(int)); | |
202 | ||
203 | if (bufsize < sizeof(phandle)) | |
204 | return -EINVAL; | |
205 | ||
206 | ph = *((int *) op->oprom_array); | |
207 | if (ph) { | |
208 | dp = of_find_node_by_phandle(ph); | |
209 | if (!dp) | |
210 | return -EINVAL; | |
211 | ||
212 | switch (cmd) { | |
213 | case OPROMNEXT: | |
214 | dp = dp->sibling; | |
215 | break; | |
216 | ||
217 | case OPROMCHILD: | |
218 | dp = dp->child; | |
219 | break; | |
220 | ||
221 | case OPROMSETCUR: | |
222 | default: | |
223 | break; | |
224 | }; | |
225 | } else { | |
226 | /* Sibling of node zero is the root node. */ | |
227 | if (cmd != OPROMNEXT) | |
228 | return -EINVAL; | |
229 | ||
230 | dp = of_find_node_by_path("/"); | |
231 | } | |
232 | ||
233 | ph = 0; | |
234 | if (dp) | |
235 | ph = dp->node; | |
236 | ||
237 | data->current_node = dp; | |
238 | *((int *) op->oprom_array) = ph; | |
239 | op->oprom_size = sizeof(phandle); | |
240 | ||
241 | return copyout(argp, op, bufsize + sizeof(int)); | |
242 | } | |
243 | ||
244 | static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data) | |
245 | { | |
246 | int err = -EINVAL; | |
247 | ||
248 | if (bufsize >= 2*sizeof(int)) { | |
249 | #ifdef CONFIG_PCI | |
250 | struct pci_dev *pdev; | |
fa449bd6 DM |
251 | struct device_node *dp; |
252 | ||
7e9f3346 | 253 | pdev = pci_get_bus_and_slot (((int *) op->oprom_array)[0], |
8e48aec7 DM |
254 | ((int *) op->oprom_array)[1]); |
255 | ||
fa449bd6 DM |
256 | dp = pci_device_to_OF_node(pdev); |
257 | data->current_node = dp; | |
258 | *((int *)op->oprom_array) = dp->node; | |
259 | op->oprom_size = sizeof(int); | |
260 | err = copyout(argp, op, bufsize + sizeof(int)); | |
261 | ||
7e9f3346 | 262 | pci_dev_put(pdev); |
8e48aec7 DM |
263 | #endif |
264 | } | |
265 | ||
266 | return err; | |
267 | } | |
268 | ||
269 | static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data) | |
270 | { | |
b9b64e6e DM |
271 | phandle ph = 0; |
272 | ||
8e48aec7 | 273 | dp = of_find_node_by_path(op->oprom_array); |
b9b64e6e DM |
274 | if (dp) |
275 | ph = dp->node; | |
8e48aec7 | 276 | data->current_node = dp; |
b9b64e6e | 277 | *((int *)op->oprom_array) = ph; |
8e48aec7 DM |
278 | op->oprom_size = sizeof(int); |
279 | ||
280 | return copyout(argp, op, bufsize + sizeof(int)); | |
281 | } | |
282 | ||
283 | static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize) | |
284 | { | |
285 | char *buf = saved_command_line; | |
286 | int len = strlen(buf); | |
287 | ||
288 | if (len > bufsize) | |
289 | return -EINVAL; | |
290 | ||
291 | strcpy(op->oprom_array, buf); | |
292 | op->oprom_size = len; | |
293 | ||
294 | return copyout(argp, op, bufsize + sizeof(int)); | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * SunOS and Solaris /dev/openprom ioctl calls. | |
299 | */ | |
300 | static int openprom_sunos_ioctl(struct inode * inode, struct file * file, | |
8e48aec7 DM |
301 | unsigned int cmd, unsigned long arg, |
302 | struct device_node *dp) | |
1da177e4 | 303 | { |
8e48aec7 | 304 | DATA *data = file->private_data; |
1da177e4 | 305 | struct openpromio *opp; |
8e48aec7 | 306 | int bufsize, error = 0; |
1da177e4 LT |
307 | static int cnt; |
308 | void __user *argp = (void __user *)arg; | |
309 | ||
310 | if (cmd == OPROMSETOPT) | |
311 | bufsize = getstrings(argp, &opp); | |
312 | else | |
313 | bufsize = copyin(argp, &opp); | |
314 | ||
315 | if (bufsize < 0) | |
316 | return bufsize; | |
317 | ||
318 | switch (cmd) { | |
319 | case OPROMGETOPT: | |
320 | case OPROMGETPROP: | |
8e48aec7 | 321 | error = opromgetprop(argp, dp, opp, bufsize); |
1da177e4 LT |
322 | break; |
323 | ||
324 | case OPROMNXTOPT: | |
325 | case OPROMNXTPROP: | |
8e48aec7 | 326 | error = opromnxtprop(argp, dp, opp, bufsize); |
1da177e4 LT |
327 | break; |
328 | ||
329 | case OPROMSETOPT: | |
330 | case OPROMSETOPT2: | |
8e48aec7 | 331 | error = opromsetopt(dp, opp, bufsize); |
1da177e4 LT |
332 | break; |
333 | ||
334 | case OPROMNEXT: | |
335 | case OPROMCHILD: | |
336 | case OPROMSETCUR: | |
8e48aec7 | 337 | error = opromnext(argp, cmd, dp, opp, bufsize, data); |
1da177e4 LT |
338 | break; |
339 | ||
340 | case OPROMPCI2NODE: | |
8e48aec7 | 341 | error = oprompci2node(argp, dp, opp, bufsize, data); |
1da177e4 LT |
342 | break; |
343 | ||
344 | case OPROMPATH2NODE: | |
8e48aec7 | 345 | error = oprompath2node(argp, dp, opp, bufsize, data); |
1da177e4 LT |
346 | break; |
347 | ||
348 | case OPROMGETBOOTARGS: | |
8e48aec7 | 349 | error = opromgetbootargs(argp, opp, bufsize); |
1da177e4 LT |
350 | break; |
351 | ||
352 | case OPROMU2P: | |
353 | case OPROMGETCONS: | |
354 | case OPROMGETFBNAME: | |
355 | if (cnt++ < 10) | |
356 | printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n"); | |
357 | error = -EINVAL; | |
358 | break; | |
359 | default: | |
360 | if (cnt++ < 10) | |
361 | printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg); | |
362 | error = -EINVAL; | |
363 | break; | |
364 | } | |
365 | ||
366 | kfree(opp); | |
367 | return error; | |
368 | } | |
369 | ||
8e48aec7 | 370 | static struct device_node *get_node(phandle n, DATA *data) |
1da177e4 | 371 | { |
8e48aec7 | 372 | struct device_node *dp = of_find_node_by_phandle(n); |
1da177e4 | 373 | |
8e48aec7 DM |
374 | if (dp) |
375 | data->lastnode = dp; | |
376 | ||
377 | return dp; | |
1da177e4 LT |
378 | } |
379 | ||
380 | /* Copy in a whole string from userspace into kernelspace. */ | |
381 | static int copyin_string(char __user *user, size_t len, char **ptr) | |
382 | { | |
383 | char *tmp; | |
384 | ||
385 | if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0) | |
386 | return -EINVAL; | |
387 | ||
388 | tmp = kmalloc(len + 1, GFP_KERNEL); | |
389 | if (!tmp) | |
390 | return -ENOMEM; | |
391 | ||
8e48aec7 | 392 | if (copy_from_user(tmp, user, len)) { |
1da177e4 LT |
393 | kfree(tmp); |
394 | return -EFAULT; | |
395 | } | |
396 | ||
397 | tmp[len] = '\0'; | |
398 | ||
399 | *ptr = tmp; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | /* | |
405 | * NetBSD /dev/openprom ioctl calls. | |
406 | */ | |
8e48aec7 | 407 | static int opiocget(void __user *argp, DATA *data) |
1da177e4 | 408 | { |
1da177e4 | 409 | struct opiocdesc op; |
8e48aec7 DM |
410 | struct device_node *dp; |
411 | char *str; | |
ccf0dec6 | 412 | const void *pval; |
8e48aec7 | 413 | int err, len; |
1da177e4 | 414 | |
8e48aec7 DM |
415 | if (copy_from_user(&op, argp, sizeof(op))) |
416 | return -EFAULT; | |
1da177e4 | 417 | |
8e48aec7 | 418 | dp = get_node(op.op_nodeid, data); |
1da177e4 | 419 | |
8e48aec7 DM |
420 | err = copyin_string(op.op_name, op.op_namelen, &str); |
421 | if (err) | |
422 | return err; | |
1da177e4 | 423 | |
8e48aec7 DM |
424 | pval = of_get_property(dp, str, &len); |
425 | err = 0; | |
426 | if (!pval || len > op.op_buflen) { | |
427 | err = -EINVAL; | |
428 | } else { | |
1da177e4 | 429 | op.op_buflen = len; |
8e48aec7 DM |
430 | if (copy_to_user(argp, &op, sizeof(op)) || |
431 | copy_to_user(op.op_buf, pval, len)) | |
432 | err = -EFAULT; | |
433 | } | |
434 | kfree(str); | |
1da177e4 | 435 | |
8e48aec7 DM |
436 | return err; |
437 | } | |
1da177e4 | 438 | |
8e48aec7 DM |
439 | static int opiocnextprop(void __user *argp, DATA *data) |
440 | { | |
441 | struct opiocdesc op; | |
442 | struct device_node *dp; | |
443 | struct property *prop; | |
444 | char *str; | |
445 | int err, len; | |
1da177e4 | 446 | |
8e48aec7 DM |
447 | if (copy_from_user(&op, argp, sizeof(op))) |
448 | return -EFAULT; | |
1da177e4 | 449 | |
8e48aec7 DM |
450 | dp = get_node(op.op_nodeid, data); |
451 | if (!dp) | |
452 | return -EINVAL; | |
1da177e4 | 453 | |
8e48aec7 DM |
454 | err = copyin_string(op.op_name, op.op_namelen, &str); |
455 | if (err) | |
456 | return err; | |
1da177e4 | 457 | |
8e48aec7 DM |
458 | if (str[0] == '\0') { |
459 | prop = dp->properties; | |
460 | } else { | |
461 | prop = of_find_property(dp, str, NULL); | |
462 | if (prop) | |
463 | prop = prop->next; | |
464 | } | |
465 | kfree(str); | |
1da177e4 | 466 | |
8e48aec7 DM |
467 | if (!prop) |
468 | len = 0; | |
469 | else | |
470 | len = prop->length; | |
1da177e4 | 471 | |
8e48aec7 DM |
472 | if (len > op.op_buflen) |
473 | len = op.op_buflen; | |
1da177e4 | 474 | |
8e48aec7 DM |
475 | if (copy_to_user(argp, &op, sizeof(op))) |
476 | return -EFAULT; | |
1da177e4 | 477 | |
8e48aec7 DM |
478 | if (len && |
479 | copy_to_user(op.op_buf, prop->value, len)) | |
480 | return -EFAULT; | |
1da177e4 | 481 | |
8e48aec7 DM |
482 | return 0; |
483 | } | |
1da177e4 | 484 | |
8e48aec7 DM |
485 | static int opiocset(void __user *argp, DATA *data) |
486 | { | |
487 | struct opiocdesc op; | |
488 | struct device_node *dp; | |
489 | char *str, *tmp; | |
490 | int err; | |
1da177e4 | 491 | |
8e48aec7 DM |
492 | if (copy_from_user(&op, argp, sizeof(op))) |
493 | return -EFAULT; | |
494 | ||
495 | dp = get_node(op.op_nodeid, data); | |
496 | if (!dp) | |
497 | return -EINVAL; | |
1da177e4 | 498 | |
8e48aec7 DM |
499 | err = copyin_string(op.op_name, op.op_namelen, &str); |
500 | if (err) | |
501 | return err; | |
1da177e4 | 502 | |
8e48aec7 DM |
503 | err = copyin_string(op.op_buf, op.op_buflen, &tmp); |
504 | if (err) { | |
1da177e4 | 505 | kfree(str); |
8e48aec7 DM |
506 | return err; |
507 | } | |
1da177e4 | 508 | |
8e48aec7 | 509 | err = of_set_property(dp, str, tmp, op.op_buflen); |
1da177e4 | 510 | |
8e48aec7 DM |
511 | kfree(str); |
512 | kfree(tmp); | |
1da177e4 | 513 | |
8e48aec7 DM |
514 | return err; |
515 | } | |
1da177e4 | 516 | |
8e48aec7 DM |
517 | static int opiocgetnext(unsigned int cmd, void __user *argp) |
518 | { | |
519 | struct device_node *dp; | |
520 | phandle nd; | |
1da177e4 | 521 | |
8e48aec7 | 522 | BUILD_BUG_ON(sizeof(phandle) != sizeof(int)); |
1da177e4 | 523 | |
8e48aec7 DM |
524 | if (copy_from_user(&nd, argp, sizeof(phandle))) |
525 | return -EFAULT; | |
1da177e4 | 526 | |
8e48aec7 DM |
527 | if (nd == 0) { |
528 | if (cmd != OPIOCGETNEXT) | |
1da177e4 | 529 | return -EINVAL; |
8e48aec7 DM |
530 | dp = of_find_node_by_path("/"); |
531 | } else { | |
532 | dp = of_find_node_by_phandle(nd); | |
533 | nd = 0; | |
534 | if (dp) { | |
535 | if (cmd == OPIOCGETNEXT) | |
536 | dp = dp->sibling; | |
537 | else | |
538 | dp = dp->child; | |
539 | } | |
540 | } | |
541 | if (dp) | |
542 | nd = dp->node; | |
543 | if (copy_to_user(argp, &nd, sizeof(phandle))) | |
544 | return -EFAULT; | |
1da177e4 | 545 | |
8e48aec7 DM |
546 | return 0; |
547 | } | |
1da177e4 | 548 | |
8e48aec7 DM |
549 | static int openprom_bsd_ioctl(struct inode * inode, struct file * file, |
550 | unsigned int cmd, unsigned long arg) | |
551 | { | |
552 | DATA *data = (DATA *) file->private_data; | |
553 | void __user *argp = (void __user *)arg; | |
554 | int err; | |
1da177e4 | 555 | |
8e48aec7 DM |
556 | switch (cmd) { |
557 | case OPIOCGET: | |
558 | err = opiocget(argp, data); | |
559 | break; | |
1da177e4 | 560 | |
8e48aec7 DM |
561 | case OPIOCNEXTPROP: |
562 | err = opiocnextprop(argp, data); | |
563 | break; | |
1da177e4 | 564 | |
8e48aec7 DM |
565 | case OPIOCSET: |
566 | err = opiocset(argp, data); | |
567 | break; | |
568 | ||
569 | case OPIOCGETOPTNODE: | |
570 | BUILD_BUG_ON(sizeof(phandle) != sizeof(int)); | |
1da177e4 | 571 | |
8e48aec7 | 572 | if (copy_to_user(argp, &options_node->node, sizeof(phandle))) |
1da177e4 LT |
573 | return -EFAULT; |
574 | ||
575 | return 0; | |
576 | ||
8e48aec7 DM |
577 | case OPIOCGETNEXT: |
578 | case OPIOCGETCHILD: | |
579 | err = opiocgetnext(cmd, argp); | |
580 | break; | |
581 | ||
1da177e4 | 582 | default: |
1da177e4 LT |
583 | return -EINVAL; |
584 | ||
8e48aec7 DM |
585 | }; |
586 | ||
587 | return err; | |
1da177e4 LT |
588 | } |
589 | ||
590 | ||
591 | /* | |
592 | * Handoff control to the correct ioctl handler. | |
593 | */ | |
594 | static int openprom_ioctl(struct inode * inode, struct file * file, | |
595 | unsigned int cmd, unsigned long arg) | |
596 | { | |
597 | DATA *data = (DATA *) file->private_data; | |
1da177e4 LT |
598 | |
599 | switch (cmd) { | |
600 | case OPROMGETOPT: | |
601 | case OPROMNXTOPT: | |
602 | if ((file->f_mode & FMODE_READ) == 0) | |
603 | return -EPERM; | |
604 | return openprom_sunos_ioctl(inode, file, cmd, arg, | |
605 | options_node); | |
606 | ||
607 | case OPROMSETOPT: | |
608 | case OPROMSETOPT2: | |
609 | if ((file->f_mode & FMODE_WRITE) == 0) | |
610 | return -EPERM; | |
611 | return openprom_sunos_ioctl(inode, file, cmd, arg, | |
612 | options_node); | |
613 | ||
614 | case OPROMNEXT: | |
615 | case OPROMCHILD: | |
616 | case OPROMGETPROP: | |
617 | case OPROMNXTPROP: | |
618 | if ((file->f_mode & FMODE_READ) == 0) | |
619 | return -EPERM; | |
620 | return openprom_sunos_ioctl(inode, file, cmd, arg, | |
621 | data->current_node); | |
622 | ||
623 | case OPROMU2P: | |
624 | case OPROMGETCONS: | |
625 | case OPROMGETFBNAME: | |
626 | case OPROMGETBOOTARGS: | |
627 | case OPROMSETCUR: | |
628 | case OPROMPCI2NODE: | |
629 | case OPROMPATH2NODE: | |
630 | if ((file->f_mode & FMODE_READ) == 0) | |
631 | return -EPERM; | |
a6ded1b0 | 632 | return openprom_sunos_ioctl(inode, file, cmd, arg, NULL); |
1da177e4 LT |
633 | |
634 | case OPIOCGET: | |
635 | case OPIOCNEXTPROP: | |
636 | case OPIOCGETOPTNODE: | |
637 | case OPIOCGETNEXT: | |
638 | case OPIOCGETCHILD: | |
639 | if ((file->f_mode & FMODE_READ) == 0) | |
640 | return -EBADF; | |
641 | return openprom_bsd_ioctl(inode,file,cmd,arg); | |
642 | ||
643 | case OPIOCSET: | |
644 | if ((file->f_mode & FMODE_WRITE) == 0) | |
645 | return -EBADF; | |
646 | return openprom_bsd_ioctl(inode,file,cmd,arg); | |
647 | ||
648 | default: | |
1da177e4 | 649 | return -EINVAL; |
8e48aec7 | 650 | }; |
1da177e4 LT |
651 | } |
652 | ||
b31023fc CH |
653 | static long openprom_compat_ioctl(struct file *file, unsigned int cmd, |
654 | unsigned long arg) | |
655 | { | |
656 | long rval = -ENOTTY; | |
657 | ||
658 | /* | |
659 | * SunOS/Solaris only, the NetBSD one's have embedded pointers in | |
660 | * the arg which we'd need to clean up... | |
661 | */ | |
662 | switch (cmd) { | |
663 | case OPROMGETOPT: | |
664 | case OPROMSETOPT: | |
665 | case OPROMNXTOPT: | |
666 | case OPROMSETOPT2: | |
667 | case OPROMNEXT: | |
668 | case OPROMCHILD: | |
669 | case OPROMGETPROP: | |
670 | case OPROMNXTPROP: | |
671 | case OPROMU2P: | |
672 | case OPROMGETCONS: | |
673 | case OPROMGETFBNAME: | |
674 | case OPROMGETBOOTARGS: | |
675 | case OPROMSETCUR: | |
676 | case OPROMPCI2NODE: | |
677 | case OPROMPATH2NODE: | |
7fa95f72 | 678 | rval = openprom_ioctl(file->f_path.dentry->d_inode, file, cmd, arg); |
b31023fc CH |
679 | break; |
680 | } | |
d5a858bc DM |
681 | |
682 | return rval; | |
b31023fc CH |
683 | } |
684 | ||
1da177e4 LT |
685 | static int openprom_open(struct inode * inode, struct file * file) |
686 | { | |
687 | DATA *data; | |
688 | ||
8e48aec7 | 689 | data = kmalloc(sizeof(DATA), GFP_KERNEL); |
1da177e4 LT |
690 | if (!data) |
691 | return -ENOMEM; | |
692 | ||
7bcc3209 | 693 | lock_kernel(); |
8e48aec7 DM |
694 | data->current_node = of_find_node_by_path("/"); |
695 | data->lastnode = data->current_node; | |
696 | file->private_data = (void *) data; | |
7bcc3209 | 697 | unlock_kernel(); |
1da177e4 LT |
698 | |
699 | return 0; | |
700 | } | |
701 | ||
702 | static int openprom_release(struct inode * inode, struct file * file) | |
703 | { | |
704 | kfree(file->private_data); | |
705 | return 0; | |
706 | } | |
707 | ||
00977a59 | 708 | static const struct file_operations openprom_fops = { |
1da177e4 LT |
709 | .owner = THIS_MODULE, |
710 | .llseek = no_llseek, | |
711 | .ioctl = openprom_ioctl, | |
d5a858bc | 712 | .compat_ioctl = openprom_compat_ioctl, |
1da177e4 LT |
713 | .open = openprom_open, |
714 | .release = openprom_release, | |
715 | }; | |
716 | ||
717 | static struct miscdevice openprom_dev = { | |
8e48aec7 DM |
718 | .minor = SUN_OPENPROM_MINOR, |
719 | .name = "openprom", | |
720 | .fops = &openprom_fops, | |
1da177e4 LT |
721 | }; |
722 | ||
723 | static int __init openprom_init(void) | |
724 | { | |
8e48aec7 DM |
725 | struct device_node *dp; |
726 | int err; | |
1da177e4 | 727 | |
8e48aec7 DM |
728 | err = misc_register(&openprom_dev); |
729 | if (err) | |
730 | return err; | |
1da177e4 | 731 | |
8e48aec7 DM |
732 | dp = of_find_node_by_path("/"); |
733 | dp = dp->child; | |
734 | while (dp) { | |
735 | if (!strcmp(dp->name, "options")) | |
736 | break; | |
737 | dp = dp->sibling; | |
738 | } | |
739 | options_node = dp; | |
1da177e4 | 740 | |
8e48aec7 | 741 | if (!options_node) { |
1da177e4 LT |
742 | misc_deregister(&openprom_dev); |
743 | return -EIO; | |
744 | } | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | static void __exit openprom_cleanup(void) | |
750 | { | |
751 | misc_deregister(&openprom_dev); | |
752 | } | |
753 | ||
754 | module_init(openprom_init); | |
755 | module_exit(openprom_cleanup); |