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1da177e4 LT |
1 | /* |
2 | * Interfaces to retrieve and set PDC Stable options (firmware) | |
3 | * | |
4 | * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | * | |
21 | * DEV NOTE: the PDC Procedures reference states that: | |
22 | * "A minimum of 96 bytes of Stable Storage is required. Providing more than | |
23 | * 96 bytes of Stable Storage is optional [...]. Failure to provide the | |
24 | * optional locations from 96 to 192 results in the loss of certain | |
25 | * functionality during boot." | |
26 | * | |
27 | * Since locations between 96 and 192 are the various paths, most (if not | |
28 | * all) PA-RISC machines should have them. Anyway, for safety reasons, the | |
29 | * following code can deal with only 96 bytes of Stable Storage, and all | |
30 | * sizes between 96 and 192 bytes (provided they are multiple of struct | |
31 | * device_path size, eg: 128, 160 and 192) to provide full information. | |
32 | * The code makes no use of data above 192 bytes. One last word: there's one | |
33 | * path we can always count on: the primary path. | |
34 | */ | |
35 | ||
36 | #undef PDCS_DEBUG | |
37 | #ifdef PDCS_DEBUG | |
38 | #define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args) | |
39 | #else | |
40 | #define DPRINTK(fmt, args...) | |
41 | #endif | |
42 | ||
43 | #include <linux/module.h> | |
44 | #include <linux/init.h> | |
1da177e4 LT |
45 | #include <linux/kernel.h> |
46 | #include <linux/string.h> | |
c59ede7b | 47 | #include <linux/capability.h> |
1da177e4 LT |
48 | #include <linux/ctype.h> |
49 | #include <linux/sysfs.h> | |
50 | #include <linux/kobject.h> | |
51 | #include <linux/device.h> | |
52 | #include <linux/errno.h> | |
53 | ||
54 | #include <asm/pdc.h> | |
55 | #include <asm/page.h> | |
56 | #include <asm/uaccess.h> | |
57 | #include <asm/hardware.h> | |
58 | ||
4b991da7 | 59 | #define PDCS_VERSION "0.10" |
1da177e4 LT |
60 | |
61 | #define PDCS_ADDR_PPRI 0x00 | |
62 | #define PDCS_ADDR_OSID 0x40 | |
63 | #define PDCS_ADDR_FSIZ 0x5C | |
64 | #define PDCS_ADDR_PCON 0x60 | |
65 | #define PDCS_ADDR_PALT 0x80 | |
66 | #define PDCS_ADDR_PKBD 0xA0 | |
67 | ||
68 | MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>"); | |
69 | MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data"); | |
70 | MODULE_LICENSE("GPL"); | |
71 | MODULE_VERSION(PDCS_VERSION); | |
72 | ||
8039de10 | 73 | static unsigned long pdcs_size __read_mostly; |
1da177e4 LT |
74 | |
75 | /* This struct defines what we need to deal with a parisc pdc path entry */ | |
76 | struct pdcspath_entry { | |
77 | short ready; /* entry record is valid if != 0 */ | |
78 | unsigned long addr; /* entry address in stable storage */ | |
79 | char *name; /* entry name */ | |
80 | struct device_path devpath; /* device path in parisc representation */ | |
81 | struct device *dev; /* corresponding device */ | |
82 | struct kobject kobj; | |
83 | }; | |
84 | ||
85 | struct pdcspath_attribute { | |
86 | struct attribute attr; | |
87 | ssize_t (*show)(struct pdcspath_entry *entry, char *buf); | |
88 | ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count); | |
89 | }; | |
90 | ||
91 | #define PDCSPATH_ENTRY(_addr, _name) \ | |
92 | struct pdcspath_entry pdcspath_entry_##_name = { \ | |
93 | .ready = 0, \ | |
94 | .addr = _addr, \ | |
95 | .name = __stringify(_name), \ | |
96 | }; | |
97 | ||
98 | #define PDCS_ATTR(_name, _mode, _show, _store) \ | |
99 | struct subsys_attribute pdcs_attr_##_name = { \ | |
100 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | |
101 | .show = _show, \ | |
102 | .store = _store, \ | |
103 | }; | |
104 | ||
105 | #define PATHS_ATTR(_name, _mode, _show, _store) \ | |
106 | struct pdcspath_attribute paths_attr_##_name = { \ | |
107 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | |
108 | .show = _show, \ | |
109 | .store = _store, \ | |
110 | }; | |
111 | ||
112 | #define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr) | |
113 | #define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj) | |
114 | ||
115 | /** | |
116 | * pdcspath_fetch - This function populates the path entry structs. | |
117 | * @entry: A pointer to an allocated pdcspath_entry. | |
118 | * | |
119 | * The general idea is that you don't read from the Stable Storage every time | |
120 | * you access the files provided by the facilites. We store a copy of the | |
121 | * content of the stable storage WRT various paths in these structs. We read | |
122 | * these structs when reading the files, and we will write to these structs when | |
123 | * writing to the files, and only then write them back to the Stable Storage. | |
124 | */ | |
125 | static int | |
126 | pdcspath_fetch(struct pdcspath_entry *entry) | |
127 | { | |
128 | struct device_path *devpath; | |
129 | ||
130 | if (!entry) | |
131 | return -EINVAL; | |
132 | ||
133 | devpath = &entry->devpath; | |
134 | ||
135 | DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
136 | entry, devpath, entry->addr); | |
137 | ||
138 | /* addr, devpath and count must be word aligned */ | |
139 | if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) | |
140 | return -EIO; | |
141 | ||
142 | /* Find the matching device. | |
143 | NOTE: hardware_path overlays with device_path, so the nice cast can | |
144 | be used */ | |
145 | entry->dev = hwpath_to_device((struct hardware_path *)devpath); | |
146 | ||
147 | entry->ready = 1; | |
148 | ||
149 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | /** | |
155 | * pdcspath_store - This function writes a path to stable storage. | |
156 | * @entry: A pointer to an allocated pdcspath_entry. | |
157 | * | |
158 | * It can be used in two ways: either by passing it a preset devpath struct | |
159 | * containing an already computed hardware path, or by passing it a device | |
160 | * pointer, from which it'll find out the corresponding hardware path. | |
161 | * For now we do not handle the case where there's an error in writing to the | |
162 | * Stable Storage area, so you'd better not mess up the data :P | |
163 | */ | |
164 | static int | |
165 | pdcspath_store(struct pdcspath_entry *entry) | |
166 | { | |
167 | struct device_path *devpath; | |
168 | ||
169 | if (!entry) | |
170 | return -EINVAL; | |
171 | ||
172 | devpath = &entry->devpath; | |
173 | ||
174 | /* We expect the caller to set the ready flag to 0 if the hardware | |
175 | path struct provided is invalid, so that we know we have to fill it. | |
176 | First case, we don't have a preset hwpath... */ | |
177 | if (!entry->ready) { | |
178 | /* ...but we have a device, map it */ | |
179 | if (entry->dev) | |
180 | device_to_hwpath(entry->dev, (struct hardware_path *)devpath); | |
181 | else | |
182 | return -EINVAL; | |
183 | } | |
184 | /* else, we expect the provided hwpath to be valid. */ | |
185 | ||
186 | DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
187 | entry, devpath, entry->addr); | |
188 | ||
189 | /* addr, devpath and count must be word aligned */ | |
190 | if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) { | |
191 | printk(KERN_ERR "%s: an error occured when writing to PDC.\n" | |
192 | "It is likely that the Stable Storage data has been corrupted.\n" | |
193 | "Please check it carefully upon next reboot.\n", __func__); | |
194 | return -EIO; | |
195 | } | |
196 | ||
4b991da7 TV |
197 | /* kobject is already registered */ |
198 | entry->ready = 2; | |
1da177e4 LT |
199 | |
200 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | /** | |
206 | * pdcspath_hwpath_read - This function handles hardware path pretty printing. | |
207 | * @entry: An allocated and populated pdscpath_entry struct. | |
208 | * @buf: The output buffer to write to. | |
209 | * | |
210 | * We will call this function to format the output of the hwpath attribute file. | |
211 | */ | |
212 | static ssize_t | |
213 | pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) | |
214 | { | |
215 | char *out = buf; | |
216 | struct device_path *devpath; | |
217 | unsigned short i; | |
218 | ||
219 | if (!entry || !buf) | |
220 | return -EINVAL; | |
221 | ||
222 | devpath = &entry->devpath; | |
223 | ||
224 | if (!entry->ready) | |
225 | return -ENODATA; | |
226 | ||
227 | for (i = 0; i < 6; i++) { | |
228 | if (devpath->bc[i] >= 128) | |
229 | continue; | |
230 | out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); | |
231 | } | |
232 | out += sprintf(out, "%u\n", (unsigned char)devpath->mod); | |
233 | ||
234 | return out - buf; | |
235 | } | |
236 | ||
237 | /** | |
238 | * pdcspath_hwpath_write - This function handles hardware path modifying. | |
239 | * @entry: An allocated and populated pdscpath_entry struct. | |
240 | * @buf: The input buffer to read from. | |
241 | * @count: The number of bytes to be read. | |
242 | * | |
243 | * We will call this function to change the current hardware path. | |
244 | * Hardware paths are to be given '/'-delimited, without brackets. | |
245 | * We take care to make sure that the provided path actually maps to an existing | |
246 | * device, BUT nothing would prevent some foolish user to set the path to some | |
247 | * PCI bridge or even a CPU... | |
248 | * A better work around would be to make sure we are at the end of a device tree | |
249 | * for instance, but it would be IMHO beyond the simple scope of that driver. | |
250 | * The aim is to provide a facility. Data correctness is left to userland. | |
251 | */ | |
252 | static ssize_t | |
253 | pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
254 | { | |
255 | struct hardware_path hwpath; | |
256 | unsigned short i; | |
257 | char in[count+1], *temp; | |
258 | struct device *dev; | |
259 | ||
260 | if (!entry || !buf || !count) | |
261 | return -EINVAL; | |
262 | ||
263 | /* We'll use a local copy of buf */ | |
264 | memset(in, 0, count+1); | |
265 | strncpy(in, buf, count); | |
266 | ||
267 | /* Let's clean up the target. 0xff is a blank pattern */ | |
268 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
269 | ||
270 | /* First, pick the mod field (the last one of the input string) */ | |
271 | if (!(temp = strrchr(in, '/'))) | |
272 | return -EINVAL; | |
273 | ||
274 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
275 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
276 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
277 | ||
278 | /* Then, loop for each delimiter, making sure we don't have too many. | |
279 | we write the bc fields in a down-top way. No matter what, we stop | |
280 | before writing the last field. If there are too many fields anyway, | |
281 | then the user is a moron and it'll be caught up later when we'll | |
282 | check the consistency of the given hwpath. */ | |
283 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
284 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
285 | in[temp-in] = '\0'; | |
286 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
287 | } | |
288 | ||
289 | /* Store the final field */ | |
290 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
291 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
292 | ||
293 | /* Now we check that the user isn't trying to lure us */ | |
294 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
295 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
296 | "hardware path: %s\n", __func__, entry->name, buf); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | /* So far so good, let's get in deep */ | |
301 | entry->ready = 0; | |
302 | entry->dev = dev; | |
303 | ||
304 | /* Now, dive in. Write back to the hardware */ | |
305 | WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */ | |
306 | ||
307 | /* Update the symlink to the real device */ | |
308 | sysfs_remove_link(&entry->kobj, "device"); | |
309 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
310 | ||
311 | printk(KERN_INFO "PDC Stable Storage: changed \"%s\" path to \"%s\"\n", | |
312 | entry->name, buf); | |
313 | ||
314 | return count; | |
315 | } | |
316 | ||
317 | /** | |
318 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
319 | * @entry: An allocated and populated pdscpath_entry struct. | |
320 | * @buf: The output buffer to write to. | |
321 | * | |
322 | * We will call this function to format the output of the layer attribute file. | |
323 | */ | |
324 | static ssize_t | |
325 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
326 | { | |
327 | char *out = buf; | |
328 | struct device_path *devpath; | |
329 | unsigned short i; | |
330 | ||
331 | if (!entry || !buf) | |
332 | return -EINVAL; | |
333 | ||
334 | devpath = &entry->devpath; | |
335 | ||
336 | if (!entry->ready) | |
337 | return -ENODATA; | |
338 | ||
339 | for (i = 0; devpath->layers[i] && (likely(i < 6)); i++) | |
340 | out += sprintf(out, "%u ", devpath->layers[i]); | |
341 | ||
342 | out += sprintf(out, "\n"); | |
343 | ||
344 | return out - buf; | |
345 | } | |
346 | ||
347 | /** | |
348 | * pdcspath_layer_write - This function handles extended layer modifying. | |
349 | * @entry: An allocated and populated pdscpath_entry struct. | |
350 | * @buf: The input buffer to read from. | |
351 | * @count: The number of bytes to be read. | |
352 | * | |
353 | * We will call this function to change the current layer value. | |
354 | * Layers are to be given '.'-delimited, without brackets. | |
355 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
356 | * Potential harm can be done, since there's no way to check the validity of | |
357 | * the layer fields. | |
358 | */ | |
359 | static ssize_t | |
360 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
361 | { | |
362 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
363 | unsigned short i; | |
364 | char in[count+1], *temp; | |
365 | ||
366 | if (!entry || !buf || !count) | |
367 | return -EINVAL; | |
368 | ||
369 | /* We'll use a local copy of buf */ | |
370 | memset(in, 0, count+1); | |
371 | strncpy(in, buf, count); | |
372 | ||
373 | /* Let's clean up the target. 0 is a blank pattern */ | |
374 | memset(&layers, 0, sizeof(layers)); | |
375 | ||
376 | /* First, pick the first layer */ | |
377 | if (unlikely(!isdigit(*in))) | |
378 | return -EINVAL; | |
379 | layers[0] = simple_strtoul(in, NULL, 10); | |
380 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
381 | ||
382 | temp = in; | |
383 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
384 | if (unlikely(!isdigit(*(++temp)))) | |
385 | return -EINVAL; | |
386 | layers[i] = simple_strtoul(temp, NULL, 10); | |
387 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
388 | } | |
389 | ||
390 | /* So far so good, let's get in deep */ | |
391 | ||
392 | /* First, overwrite the current layers with the new ones, not touching | |
393 | the hardware path. */ | |
394 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
395 | ||
396 | /* Now, dive in. Write back to the hardware */ | |
397 | WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */ | |
398 | ||
399 | printk(KERN_INFO "PDC Stable Storage: changed \"%s\" layers to \"%s\"\n", | |
400 | entry->name, buf); | |
401 | ||
402 | return count; | |
403 | } | |
404 | ||
405 | /** | |
406 | * pdcspath_attr_show - Generic read function call wrapper. | |
407 | * @kobj: The kobject to get info from. | |
408 | * @attr: The attribute looked upon. | |
409 | * @buf: The output buffer. | |
410 | */ | |
411 | static ssize_t | |
412 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
413 | { | |
414 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
415 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
416 | ssize_t ret = 0; | |
417 | ||
418 | if (!capable(CAP_SYS_ADMIN)) | |
419 | return -EACCES; | |
420 | ||
421 | if (pdcs_attr->show) | |
422 | ret = pdcs_attr->show(entry, buf); | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
427 | /** | |
428 | * pdcspath_attr_store - Generic write function call wrapper. | |
429 | * @kobj: The kobject to write info to. | |
430 | * @attr: The attribute to be modified. | |
431 | * @buf: The input buffer. | |
432 | * @count: The size of the buffer. | |
433 | */ | |
434 | static ssize_t | |
435 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
436 | const char *buf, size_t count) | |
437 | { | |
438 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
439 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
440 | ssize_t ret = 0; | |
441 | ||
442 | if (!capable(CAP_SYS_ADMIN)) | |
443 | return -EACCES; | |
444 | ||
445 | if (pdcs_attr->store) | |
446 | ret = pdcs_attr->store(entry, buf, count); | |
447 | ||
448 | return ret; | |
449 | } | |
450 | ||
451 | static struct sysfs_ops pdcspath_attr_ops = { | |
452 | .show = pdcspath_attr_show, | |
453 | .store = pdcspath_attr_store, | |
454 | }; | |
455 | ||
456 | /* These are the two attributes of any PDC path. */ | |
457 | static PATHS_ATTR(hwpath, 0600, pdcspath_hwpath_read, pdcspath_hwpath_write); | |
458 | static PATHS_ATTR(layer, 0600, pdcspath_layer_read, pdcspath_layer_write); | |
459 | ||
460 | static struct attribute *paths_subsys_attrs[] = { | |
461 | &paths_attr_hwpath.attr, | |
462 | &paths_attr_layer.attr, | |
463 | NULL, | |
464 | }; | |
465 | ||
466 | /* Specific kobject type for our PDC paths */ | |
467 | static struct kobj_type ktype_pdcspath = { | |
468 | .sysfs_ops = &pdcspath_attr_ops, | |
469 | .default_attrs = paths_subsys_attrs, | |
470 | }; | |
471 | ||
472 | /* We hard define the 4 types of path we expect to find */ | |
473 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
474 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
475 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
476 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
477 | ||
478 | /* An array containing all PDC paths we will deal with */ | |
479 | static struct pdcspath_entry *pdcspath_entries[] = { | |
480 | &pdcspath_entry_primary, | |
481 | &pdcspath_entry_alternative, | |
482 | &pdcspath_entry_console, | |
483 | &pdcspath_entry_keyboard, | |
484 | NULL, | |
485 | }; | |
486 | ||
487 | /** | |
488 | * pdcs_info_read - Pretty printing of the remaining useful data. | |
489 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
490 | * @buf: The output buffer to write to. | |
491 | * | |
492 | * We will call this function to format the output of the 'info' attribute file. | |
493 | * Please refer to PDC Procedures documentation, section PDC_STABLE to get a | |
494 | * better insight of what we're doing here. | |
495 | */ | |
496 | static ssize_t | |
497 | pdcs_info_read(struct subsystem *entry, char *buf) | |
498 | { | |
499 | char *out = buf; | |
500 | __u32 result; | |
501 | struct device_path devpath; | |
502 | char *tmpstr = NULL; | |
503 | ||
504 | if (!entry || !buf) | |
505 | return -EINVAL; | |
506 | ||
507 | /* show the size of the stable storage */ | |
508 | out += sprintf(out, "Stable Storage size: %ld bytes\n", pdcs_size); | |
509 | ||
510 | /* deal with flags */ | |
511 | if (pdc_stable_read(PDCS_ADDR_PPRI, &devpath, sizeof(devpath)) != PDC_OK) | |
512 | return -EIO; | |
513 | ||
514 | out += sprintf(out, "Autoboot: %s\n", (devpath.flags & PF_AUTOBOOT) ? "On" : "Off"); | |
515 | out += sprintf(out, "Autosearch: %s\n", (devpath.flags & PF_AUTOSEARCH) ? "On" : "Off"); | |
516 | out += sprintf(out, "Timer: %u s\n", (devpath.flags & PF_TIMER) ? (1 << (devpath.flags & PF_TIMER)) : 0); | |
517 | ||
518 | /* get OSID */ | |
519 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
520 | return -EIO; | |
521 | ||
522 | /* the actual result is 16 bits away */ | |
523 | switch (result >> 16) { | |
524 | case 0x0000: tmpstr = "No OS-dependent data"; break; | |
525 | case 0x0001: tmpstr = "HP-UX dependent data"; break; | |
526 | case 0x0002: tmpstr = "MPE-iX dependent data"; break; | |
527 | case 0x0003: tmpstr = "OSF dependent data"; break; | |
528 | case 0x0004: tmpstr = "HP-RT dependent data"; break; | |
529 | case 0x0005: tmpstr = "Novell Netware dependent data"; break; | |
530 | default: tmpstr = "Unknown"; break; | |
531 | } | |
532 | out += sprintf(out, "OS ID: %s (0x%.4x)\n", tmpstr, (result >> 16)); | |
533 | ||
534 | /* get fast-size */ | |
535 | if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) | |
536 | return -EIO; | |
537 | ||
538 | out += sprintf(out, "Memory tested: "); | |
539 | if ((result & 0x0F) < 0x0E) | |
abff7543 | 540 | out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); |
1da177e4 LT |
541 | else |
542 | out += sprintf(out, "All"); | |
543 | out += sprintf(out, "\n"); | |
544 | ||
545 | return out - buf; | |
546 | } | |
547 | ||
548 | /** | |
549 | * pdcs_info_write - This function handles boot flag modifying. | |
550 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
551 | * @buf: The input buffer to read from. | |
552 | * @count: The number of bytes to be read. | |
553 | * | |
554 | * We will call this function to change the current boot flags. | |
555 | * We expect a precise syntax: | |
556 | * \"n n\" (n == 0 or 1) to toggle respectively AutoBoot and AutoSearch | |
557 | * | |
558 | * As of now there is no incentive on my side to provide more "knobs" to that | |
559 | * interface, since modifying the rest of the data is pretty meaningless when | |
560 | * the machine is running and for the expected use of that facility, such as | |
561 | * PALO setting up the boot disk when installing a Linux distribution... | |
562 | */ | |
563 | static ssize_t | |
564 | pdcs_info_write(struct subsystem *entry, const char *buf, size_t count) | |
565 | { | |
566 | struct pdcspath_entry *pathentry; | |
567 | unsigned char flags; | |
568 | char in[count+1], *temp; | |
569 | char c; | |
570 | ||
571 | if (!capable(CAP_SYS_ADMIN)) | |
572 | return -EACCES; | |
573 | ||
574 | if (!entry || !buf || !count) | |
575 | return -EINVAL; | |
576 | ||
577 | /* We'll use a local copy of buf */ | |
578 | memset(in, 0, count+1); | |
579 | strncpy(in, buf, count); | |
580 | ||
581 | /* Current flags are stored in primary boot path entry */ | |
582 | pathentry = &pdcspath_entry_primary; | |
583 | ||
584 | /* Be nice to the existing flag record */ | |
585 | flags = pathentry->devpath.flags; | |
586 | ||
587 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
588 | ||
589 | temp = in; | |
590 | ||
591 | while (*temp && isspace(*temp)) | |
592 | temp++; | |
593 | ||
594 | c = *temp++ - '0'; | |
595 | if ((c != 0) && (c != 1)) | |
596 | goto parse_error; | |
597 | if (c == 0) | |
598 | flags &= ~PF_AUTOBOOT; | |
599 | else | |
600 | flags |= PF_AUTOBOOT; | |
601 | ||
602 | if (*temp++ != ' ') | |
603 | goto parse_error; | |
604 | ||
605 | c = *temp++ - '0'; | |
606 | if ((c != 0) && (c != 1)) | |
607 | goto parse_error; | |
608 | if (c == 0) | |
609 | flags &= ~PF_AUTOSEARCH; | |
610 | else | |
611 | flags |= PF_AUTOSEARCH; | |
612 | ||
613 | DPRINTK("%s: flags after: 0x%X\n", __func__, flags); | |
614 | ||
615 | /* So far so good, let's get in deep */ | |
616 | ||
617 | /* Change the path entry flags first */ | |
618 | pathentry->devpath.flags = flags; | |
619 | ||
620 | /* Now, dive in. Write back to the hardware */ | |
621 | WARN_ON(pdcspath_store(pathentry)); /* this warn should *NEVER* happen */ | |
622 | ||
623 | printk(KERN_INFO "PDC Stable Storage: changed flags to \"%s\"\n", buf); | |
624 | ||
625 | return count; | |
626 | ||
627 | parse_error: | |
628 | printk(KERN_WARNING "%s: Parse error: expect \"n n\" (n == 0 or 1) for AB and AS\n", __func__); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
632 | /* The last attribute (the 'root' one actually) with all remaining data. */ | |
633 | static PDCS_ATTR(info, 0600, pdcs_info_read, pdcs_info_write); | |
634 | ||
635 | static struct subsys_attribute *pdcs_subsys_attrs[] = { | |
636 | &pdcs_attr_info, | |
637 | NULL, /* maybe more in the future? */ | |
638 | }; | |
639 | ||
640 | static decl_subsys(paths, &ktype_pdcspath, NULL); | |
641 | static decl_subsys(pdc, NULL, NULL); | |
642 | ||
643 | /** | |
644 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
645 | * | |
646 | * It creates kobjects corresponding to each path entry with nice sysfs | |
647 | * links to the real device. This is where the magic takes place: when | |
648 | * registering the subsystem attributes during module init, each kobject hereby | |
649 | * created will show in the sysfs tree as a folder containing files as defined | |
650 | * by path_subsys_attr[]. | |
651 | */ | |
652 | static inline int __init | |
653 | pdcs_register_pathentries(void) | |
654 | { | |
655 | unsigned short i; | |
656 | struct pdcspath_entry *entry; | |
4b991da7 | 657 | int err; |
1da177e4 LT |
658 | |
659 | for (i = 0; (entry = pdcspath_entries[i]); i++) { | |
660 | if (pdcspath_fetch(entry) < 0) | |
661 | continue; | |
662 | ||
4b991da7 TV |
663 | if ((err = kobject_set_name(&entry->kobj, "%s", entry->name))) |
664 | return err; | |
1da177e4 | 665 | kobj_set_kset_s(entry, paths_subsys); |
4b991da7 TV |
666 | if ((err = kobject_register(&entry->kobj))) |
667 | return err; | |
668 | ||
669 | /* kobject is now registered */ | |
670 | entry->ready = 2; | |
671 | ||
1da177e4 LT |
672 | if (!entry->dev) |
673 | continue; | |
674 | ||
675 | /* Add a nice symlink to the real device */ | |
676 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
677 | } | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
682 | /** | |
683 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
684 | */ | |
4b991da7 | 685 | static inline void |
1da177e4 LT |
686 | pdcs_unregister_pathentries(void) |
687 | { | |
688 | unsigned short i; | |
689 | struct pdcspath_entry *entry; | |
690 | ||
691 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
4b991da7 | 692 | if (entry->ready >= 2) |
1da177e4 LT |
693 | kobject_unregister(&entry->kobj); |
694 | } | |
695 | ||
696 | /* | |
697 | * For now we register the pdc subsystem with the firmware subsystem | |
698 | * and the paths subsystem with the pdc subsystem | |
699 | */ | |
700 | static int __init | |
701 | pdc_stable_init(void) | |
702 | { | |
703 | struct subsys_attribute *attr; | |
704 | int i, rc = 0, error = 0; | |
705 | ||
706 | /* find the size of the stable storage */ | |
707 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
708 | return -ENODEV; | |
709 | ||
710 | printk(KERN_INFO "PDC Stable Storage facility v%s\n", PDCS_VERSION); | |
711 | ||
712 | /* For now we'll register the pdc subsys within this driver */ | |
713 | if ((rc = firmware_register(&pdc_subsys))) | |
4b991da7 | 714 | goto fail_firmreg; |
1da177e4 LT |
715 | |
716 | /* Don't forget the info entry */ | |
717 | for (i = 0; (attr = pdcs_subsys_attrs[i]) && !error; i++) | |
718 | if (attr->show) | |
719 | error = subsys_create_file(&pdc_subsys, attr); | |
720 | ||
721 | /* register the paths subsys as a subsystem of pdc subsys */ | |
722 | kset_set_kset_s(&paths_subsys, pdc_subsys); | |
4b991da7 TV |
723 | if ((rc= subsystem_register(&paths_subsys))) |
724 | goto fail_subsysreg; | |
1da177e4 LT |
725 | |
726 | /* now we create all "files" for the paths subsys */ | |
4b991da7 TV |
727 | if ((rc = pdcs_register_pathentries())) |
728 | goto fail_pdcsreg; | |
729 | ||
730 | return rc; | |
1da177e4 | 731 | |
4b991da7 TV |
732 | fail_pdcsreg: |
733 | pdcs_unregister_pathentries(); | |
734 | subsystem_unregister(&paths_subsys); | |
735 | ||
736 | fail_subsysreg: | |
737 | firmware_unregister(&pdc_subsys); | |
738 | ||
739 | fail_firmreg: | |
740 | printk(KERN_INFO "PDC Stable Storage bailing out\n"); | |
741 | return rc; | |
1da177e4 LT |
742 | } |
743 | ||
744 | static void __exit | |
745 | pdc_stable_exit(void) | |
746 | { | |
747 | pdcs_unregister_pathentries(); | |
748 | subsystem_unregister(&paths_subsys); | |
749 | ||
750 | firmware_unregister(&pdc_subsys); | |
751 | } | |
752 | ||
753 | ||
754 | module_init(pdc_stable_init); | |
755 | module_exit(pdc_stable_exit); |