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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> | |
45 | #include <linux/sched.h> /* for capable() */ | |
46 | #include <linux/kernel.h> | |
47 | #include <linux/string.h> | |
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 | ||
59 | #define PDCS_VERSION "0.09" | |
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 | ||
197 | entry->ready = 1; | |
198 | ||
199 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | /** | |
205 | * pdcspath_hwpath_read - This function handles hardware path pretty printing. | |
206 | * @entry: An allocated and populated pdscpath_entry struct. | |
207 | * @buf: The output buffer to write to. | |
208 | * | |
209 | * We will call this function to format the output of the hwpath attribute file. | |
210 | */ | |
211 | static ssize_t | |
212 | pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) | |
213 | { | |
214 | char *out = buf; | |
215 | struct device_path *devpath; | |
216 | unsigned short i; | |
217 | ||
218 | if (!entry || !buf) | |
219 | return -EINVAL; | |
220 | ||
221 | devpath = &entry->devpath; | |
222 | ||
223 | if (!entry->ready) | |
224 | return -ENODATA; | |
225 | ||
226 | for (i = 0; i < 6; i++) { | |
227 | if (devpath->bc[i] >= 128) | |
228 | continue; | |
229 | out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); | |
230 | } | |
231 | out += sprintf(out, "%u\n", (unsigned char)devpath->mod); | |
232 | ||
233 | return out - buf; | |
234 | } | |
235 | ||
236 | /** | |
237 | * pdcspath_hwpath_write - This function handles hardware path modifying. | |
238 | * @entry: An allocated and populated pdscpath_entry struct. | |
239 | * @buf: The input buffer to read from. | |
240 | * @count: The number of bytes to be read. | |
241 | * | |
242 | * We will call this function to change the current hardware path. | |
243 | * Hardware paths are to be given '/'-delimited, without brackets. | |
244 | * We take care to make sure that the provided path actually maps to an existing | |
245 | * device, BUT nothing would prevent some foolish user to set the path to some | |
246 | * PCI bridge or even a CPU... | |
247 | * A better work around would be to make sure we are at the end of a device tree | |
248 | * for instance, but it would be IMHO beyond the simple scope of that driver. | |
249 | * The aim is to provide a facility. Data correctness is left to userland. | |
250 | */ | |
251 | static ssize_t | |
252 | pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
253 | { | |
254 | struct hardware_path hwpath; | |
255 | unsigned short i; | |
256 | char in[count+1], *temp; | |
257 | struct device *dev; | |
258 | ||
259 | if (!entry || !buf || !count) | |
260 | return -EINVAL; | |
261 | ||
262 | /* We'll use a local copy of buf */ | |
263 | memset(in, 0, count+1); | |
264 | strncpy(in, buf, count); | |
265 | ||
266 | /* Let's clean up the target. 0xff is a blank pattern */ | |
267 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
268 | ||
269 | /* First, pick the mod field (the last one of the input string) */ | |
270 | if (!(temp = strrchr(in, '/'))) | |
271 | return -EINVAL; | |
272 | ||
273 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
274 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
275 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
276 | ||
277 | /* Then, loop for each delimiter, making sure we don't have too many. | |
278 | we write the bc fields in a down-top way. No matter what, we stop | |
279 | before writing the last field. If there are too many fields anyway, | |
280 | then the user is a moron and it'll be caught up later when we'll | |
281 | check the consistency of the given hwpath. */ | |
282 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
283 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
284 | in[temp-in] = '\0'; | |
285 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
286 | } | |
287 | ||
288 | /* Store the final field */ | |
289 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
290 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
291 | ||
292 | /* Now we check that the user isn't trying to lure us */ | |
293 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
294 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
295 | "hardware path: %s\n", __func__, entry->name, buf); | |
296 | return -EINVAL; | |
297 | } | |
298 | ||
299 | /* So far so good, let's get in deep */ | |
300 | entry->ready = 0; | |
301 | entry->dev = dev; | |
302 | ||
303 | /* Now, dive in. Write back to the hardware */ | |
304 | WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */ | |
305 | ||
306 | /* Update the symlink to the real device */ | |
307 | sysfs_remove_link(&entry->kobj, "device"); | |
308 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
309 | ||
310 | printk(KERN_INFO "PDC Stable Storage: changed \"%s\" path to \"%s\"\n", | |
311 | entry->name, buf); | |
312 | ||
313 | return count; | |
314 | } | |
315 | ||
316 | /** | |
317 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
318 | * @entry: An allocated and populated pdscpath_entry struct. | |
319 | * @buf: The output buffer to write to. | |
320 | * | |
321 | * We will call this function to format the output of the layer attribute file. | |
322 | */ | |
323 | static ssize_t | |
324 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
325 | { | |
326 | char *out = buf; | |
327 | struct device_path *devpath; | |
328 | unsigned short i; | |
329 | ||
330 | if (!entry || !buf) | |
331 | return -EINVAL; | |
332 | ||
333 | devpath = &entry->devpath; | |
334 | ||
335 | if (!entry->ready) | |
336 | return -ENODATA; | |
337 | ||
338 | for (i = 0; devpath->layers[i] && (likely(i < 6)); i++) | |
339 | out += sprintf(out, "%u ", devpath->layers[i]); | |
340 | ||
341 | out += sprintf(out, "\n"); | |
342 | ||
343 | return out - buf; | |
344 | } | |
345 | ||
346 | /** | |
347 | * pdcspath_layer_write - This function handles extended layer modifying. | |
348 | * @entry: An allocated and populated pdscpath_entry struct. | |
349 | * @buf: The input buffer to read from. | |
350 | * @count: The number of bytes to be read. | |
351 | * | |
352 | * We will call this function to change the current layer value. | |
353 | * Layers are to be given '.'-delimited, without brackets. | |
354 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
355 | * Potential harm can be done, since there's no way to check the validity of | |
356 | * the layer fields. | |
357 | */ | |
358 | static ssize_t | |
359 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
360 | { | |
361 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
362 | unsigned short i; | |
363 | char in[count+1], *temp; | |
364 | ||
365 | if (!entry || !buf || !count) | |
366 | return -EINVAL; | |
367 | ||
368 | /* We'll use a local copy of buf */ | |
369 | memset(in, 0, count+1); | |
370 | strncpy(in, buf, count); | |
371 | ||
372 | /* Let's clean up the target. 0 is a blank pattern */ | |
373 | memset(&layers, 0, sizeof(layers)); | |
374 | ||
375 | /* First, pick the first layer */ | |
376 | if (unlikely(!isdigit(*in))) | |
377 | return -EINVAL; | |
378 | layers[0] = simple_strtoul(in, NULL, 10); | |
379 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
380 | ||
381 | temp = in; | |
382 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
383 | if (unlikely(!isdigit(*(++temp)))) | |
384 | return -EINVAL; | |
385 | layers[i] = simple_strtoul(temp, NULL, 10); | |
386 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
387 | } | |
388 | ||
389 | /* So far so good, let's get in deep */ | |
390 | ||
391 | /* First, overwrite the current layers with the new ones, not touching | |
392 | the hardware path. */ | |
393 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
394 | ||
395 | /* Now, dive in. Write back to the hardware */ | |
396 | WARN_ON(pdcspath_store(entry)); /* this warn should *NEVER* happen */ | |
397 | ||
398 | printk(KERN_INFO "PDC Stable Storage: changed \"%s\" layers to \"%s\"\n", | |
399 | entry->name, buf); | |
400 | ||
401 | return count; | |
402 | } | |
403 | ||
404 | /** | |
405 | * pdcspath_attr_show - Generic read function call wrapper. | |
406 | * @kobj: The kobject to get info from. | |
407 | * @attr: The attribute looked upon. | |
408 | * @buf: The output buffer. | |
409 | */ | |
410 | static ssize_t | |
411 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
412 | { | |
413 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
414 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
415 | ssize_t ret = 0; | |
416 | ||
417 | if (!capable(CAP_SYS_ADMIN)) | |
418 | return -EACCES; | |
419 | ||
420 | if (pdcs_attr->show) | |
421 | ret = pdcs_attr->show(entry, buf); | |
422 | ||
423 | return ret; | |
424 | } | |
425 | ||
426 | /** | |
427 | * pdcspath_attr_store - Generic write function call wrapper. | |
428 | * @kobj: The kobject to write info to. | |
429 | * @attr: The attribute to be modified. | |
430 | * @buf: The input buffer. | |
431 | * @count: The size of the buffer. | |
432 | */ | |
433 | static ssize_t | |
434 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
435 | const char *buf, size_t count) | |
436 | { | |
437 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
438 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
439 | ssize_t ret = 0; | |
440 | ||
441 | if (!capable(CAP_SYS_ADMIN)) | |
442 | return -EACCES; | |
443 | ||
444 | if (pdcs_attr->store) | |
445 | ret = pdcs_attr->store(entry, buf, count); | |
446 | ||
447 | return ret; | |
448 | } | |
449 | ||
450 | static struct sysfs_ops pdcspath_attr_ops = { | |
451 | .show = pdcspath_attr_show, | |
452 | .store = pdcspath_attr_store, | |
453 | }; | |
454 | ||
455 | /* These are the two attributes of any PDC path. */ | |
456 | static PATHS_ATTR(hwpath, 0600, pdcspath_hwpath_read, pdcspath_hwpath_write); | |
457 | static PATHS_ATTR(layer, 0600, pdcspath_layer_read, pdcspath_layer_write); | |
458 | ||
459 | static struct attribute *paths_subsys_attrs[] = { | |
460 | &paths_attr_hwpath.attr, | |
461 | &paths_attr_layer.attr, | |
462 | NULL, | |
463 | }; | |
464 | ||
465 | /* Specific kobject type for our PDC paths */ | |
466 | static struct kobj_type ktype_pdcspath = { | |
467 | .sysfs_ops = &pdcspath_attr_ops, | |
468 | .default_attrs = paths_subsys_attrs, | |
469 | }; | |
470 | ||
471 | /* We hard define the 4 types of path we expect to find */ | |
472 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
473 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
474 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
475 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
476 | ||
477 | /* An array containing all PDC paths we will deal with */ | |
478 | static struct pdcspath_entry *pdcspath_entries[] = { | |
479 | &pdcspath_entry_primary, | |
480 | &pdcspath_entry_alternative, | |
481 | &pdcspath_entry_console, | |
482 | &pdcspath_entry_keyboard, | |
483 | NULL, | |
484 | }; | |
485 | ||
486 | /** | |
487 | * pdcs_info_read - Pretty printing of the remaining useful data. | |
488 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
489 | * @buf: The output buffer to write to. | |
490 | * | |
491 | * We will call this function to format the output of the 'info' attribute file. | |
492 | * Please refer to PDC Procedures documentation, section PDC_STABLE to get a | |
493 | * better insight of what we're doing here. | |
494 | */ | |
495 | static ssize_t | |
496 | pdcs_info_read(struct subsystem *entry, char *buf) | |
497 | { | |
498 | char *out = buf; | |
499 | __u32 result; | |
500 | struct device_path devpath; | |
501 | char *tmpstr = NULL; | |
502 | ||
503 | if (!entry || !buf) | |
504 | return -EINVAL; | |
505 | ||
506 | /* show the size of the stable storage */ | |
507 | out += sprintf(out, "Stable Storage size: %ld bytes\n", pdcs_size); | |
508 | ||
509 | /* deal with flags */ | |
510 | if (pdc_stable_read(PDCS_ADDR_PPRI, &devpath, sizeof(devpath)) != PDC_OK) | |
511 | return -EIO; | |
512 | ||
513 | out += sprintf(out, "Autoboot: %s\n", (devpath.flags & PF_AUTOBOOT) ? "On" : "Off"); | |
514 | out += sprintf(out, "Autosearch: %s\n", (devpath.flags & PF_AUTOSEARCH) ? "On" : "Off"); | |
515 | out += sprintf(out, "Timer: %u s\n", (devpath.flags & PF_TIMER) ? (1 << (devpath.flags & PF_TIMER)) : 0); | |
516 | ||
517 | /* get OSID */ | |
518 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
519 | return -EIO; | |
520 | ||
521 | /* the actual result is 16 bits away */ | |
522 | switch (result >> 16) { | |
523 | case 0x0000: tmpstr = "No OS-dependent data"; break; | |
524 | case 0x0001: tmpstr = "HP-UX dependent data"; break; | |
525 | case 0x0002: tmpstr = "MPE-iX dependent data"; break; | |
526 | case 0x0003: tmpstr = "OSF dependent data"; break; | |
527 | case 0x0004: tmpstr = "HP-RT dependent data"; break; | |
528 | case 0x0005: tmpstr = "Novell Netware dependent data"; break; | |
529 | default: tmpstr = "Unknown"; break; | |
530 | } | |
531 | out += sprintf(out, "OS ID: %s (0x%.4x)\n", tmpstr, (result >> 16)); | |
532 | ||
533 | /* get fast-size */ | |
534 | if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) | |
535 | return -EIO; | |
536 | ||
537 | out += sprintf(out, "Memory tested: "); | |
538 | if ((result & 0x0F) < 0x0E) | |
abff7543 | 539 | out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); |
1da177e4 LT |
540 | else |
541 | out += sprintf(out, "All"); | |
542 | out += sprintf(out, "\n"); | |
543 | ||
544 | return out - buf; | |
545 | } | |
546 | ||
547 | /** | |
548 | * pdcs_info_write - This function handles boot flag modifying. | |
549 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
550 | * @buf: The input buffer to read from. | |
551 | * @count: The number of bytes to be read. | |
552 | * | |
553 | * We will call this function to change the current boot flags. | |
554 | * We expect a precise syntax: | |
555 | * \"n n\" (n == 0 or 1) to toggle respectively AutoBoot and AutoSearch | |
556 | * | |
557 | * As of now there is no incentive on my side to provide more "knobs" to that | |
558 | * interface, since modifying the rest of the data is pretty meaningless when | |
559 | * the machine is running and for the expected use of that facility, such as | |
560 | * PALO setting up the boot disk when installing a Linux distribution... | |
561 | */ | |
562 | static ssize_t | |
563 | pdcs_info_write(struct subsystem *entry, const char *buf, size_t count) | |
564 | { | |
565 | struct pdcspath_entry *pathentry; | |
566 | unsigned char flags; | |
567 | char in[count+1], *temp; | |
568 | char c; | |
569 | ||
570 | if (!capable(CAP_SYS_ADMIN)) | |
571 | return -EACCES; | |
572 | ||
573 | if (!entry || !buf || !count) | |
574 | return -EINVAL; | |
575 | ||
576 | /* We'll use a local copy of buf */ | |
577 | memset(in, 0, count+1); | |
578 | strncpy(in, buf, count); | |
579 | ||
580 | /* Current flags are stored in primary boot path entry */ | |
581 | pathentry = &pdcspath_entry_primary; | |
582 | ||
583 | /* Be nice to the existing flag record */ | |
584 | flags = pathentry->devpath.flags; | |
585 | ||
586 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
587 | ||
588 | temp = in; | |
589 | ||
590 | while (*temp && isspace(*temp)) | |
591 | temp++; | |
592 | ||
593 | c = *temp++ - '0'; | |
594 | if ((c != 0) && (c != 1)) | |
595 | goto parse_error; | |
596 | if (c == 0) | |
597 | flags &= ~PF_AUTOBOOT; | |
598 | else | |
599 | flags |= PF_AUTOBOOT; | |
600 | ||
601 | if (*temp++ != ' ') | |
602 | goto parse_error; | |
603 | ||
604 | c = *temp++ - '0'; | |
605 | if ((c != 0) && (c != 1)) | |
606 | goto parse_error; | |
607 | if (c == 0) | |
608 | flags &= ~PF_AUTOSEARCH; | |
609 | else | |
610 | flags |= PF_AUTOSEARCH; | |
611 | ||
612 | DPRINTK("%s: flags after: 0x%X\n", __func__, flags); | |
613 | ||
614 | /* So far so good, let's get in deep */ | |
615 | ||
616 | /* Change the path entry flags first */ | |
617 | pathentry->devpath.flags = flags; | |
618 | ||
619 | /* Now, dive in. Write back to the hardware */ | |
620 | WARN_ON(pdcspath_store(pathentry)); /* this warn should *NEVER* happen */ | |
621 | ||
622 | printk(KERN_INFO "PDC Stable Storage: changed flags to \"%s\"\n", buf); | |
623 | ||
624 | return count; | |
625 | ||
626 | parse_error: | |
627 | printk(KERN_WARNING "%s: Parse error: expect \"n n\" (n == 0 or 1) for AB and AS\n", __func__); | |
628 | return -EINVAL; | |
629 | } | |
630 | ||
631 | /* The last attribute (the 'root' one actually) with all remaining data. */ | |
632 | static PDCS_ATTR(info, 0600, pdcs_info_read, pdcs_info_write); | |
633 | ||
634 | static struct subsys_attribute *pdcs_subsys_attrs[] = { | |
635 | &pdcs_attr_info, | |
636 | NULL, /* maybe more in the future? */ | |
637 | }; | |
638 | ||
639 | static decl_subsys(paths, &ktype_pdcspath, NULL); | |
640 | static decl_subsys(pdc, NULL, NULL); | |
641 | ||
642 | /** | |
643 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
644 | * | |
645 | * It creates kobjects corresponding to each path entry with nice sysfs | |
646 | * links to the real device. This is where the magic takes place: when | |
647 | * registering the subsystem attributes during module init, each kobject hereby | |
648 | * created will show in the sysfs tree as a folder containing files as defined | |
649 | * by path_subsys_attr[]. | |
650 | */ | |
651 | static inline int __init | |
652 | pdcs_register_pathentries(void) | |
653 | { | |
654 | unsigned short i; | |
655 | struct pdcspath_entry *entry; | |
656 | ||
657 | for (i = 0; (entry = pdcspath_entries[i]); i++) { | |
658 | if (pdcspath_fetch(entry) < 0) | |
659 | continue; | |
660 | ||
661 | kobject_set_name(&entry->kobj, "%s", entry->name); | |
662 | kobj_set_kset_s(entry, paths_subsys); | |
663 | kobject_register(&entry->kobj); | |
664 | ||
665 | if (!entry->dev) | |
666 | continue; | |
667 | ||
668 | /* Add a nice symlink to the real device */ | |
669 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
670 | } | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | /** | |
676 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
677 | */ | |
678 | static inline void __exit | |
679 | pdcs_unregister_pathentries(void) | |
680 | { | |
681 | unsigned short i; | |
682 | struct pdcspath_entry *entry; | |
683 | ||
684 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
685 | if (entry->ready) | |
686 | kobject_unregister(&entry->kobj); | |
687 | } | |
688 | ||
689 | /* | |
690 | * For now we register the pdc subsystem with the firmware subsystem | |
691 | * and the paths subsystem with the pdc subsystem | |
692 | */ | |
693 | static int __init | |
694 | pdc_stable_init(void) | |
695 | { | |
696 | struct subsys_attribute *attr; | |
697 | int i, rc = 0, error = 0; | |
698 | ||
699 | /* find the size of the stable storage */ | |
700 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
701 | return -ENODEV; | |
702 | ||
703 | printk(KERN_INFO "PDC Stable Storage facility v%s\n", PDCS_VERSION); | |
704 | ||
705 | /* For now we'll register the pdc subsys within this driver */ | |
706 | if ((rc = firmware_register(&pdc_subsys))) | |
707 | return rc; | |
708 | ||
709 | /* Don't forget the info entry */ | |
710 | for (i = 0; (attr = pdcs_subsys_attrs[i]) && !error; i++) | |
711 | if (attr->show) | |
712 | error = subsys_create_file(&pdc_subsys, attr); | |
713 | ||
714 | /* register the paths subsys as a subsystem of pdc subsys */ | |
715 | kset_set_kset_s(&paths_subsys, pdc_subsys); | |
716 | subsystem_register(&paths_subsys); | |
717 | ||
718 | /* now we create all "files" for the paths subsys */ | |
719 | pdcs_register_pathentries(); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | static void __exit | |
725 | pdc_stable_exit(void) | |
726 | { | |
727 | pdcs_unregister_pathentries(); | |
728 | subsystem_unregister(&paths_subsys); | |
729 | ||
730 | firmware_unregister(&pdc_subsys); | |
731 | } | |
732 | ||
733 | ||
734 | module_init(pdc_stable_init); | |
735 | module_exit(pdc_stable_exit); |