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1da177e4 LT |
1 | /* |
2 | * Interfaces to retrieve and set PDC Stable options (firmware) | |
3 | * | |
c7428422 | 4 | * Copyright (C) 2005-2006 Thibaut VARENE <varenet@parisc-linux.org> |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
a81dd18e TV |
7 | * it under the terms of the GNU General Public License, version 2, as |
8 | * published by the Free Software Foundation. | |
1da177e4 LT |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * | |
20 | * DEV NOTE: the PDC Procedures reference states that: | |
21 | * "A minimum of 96 bytes of Stable Storage is required. Providing more than | |
22 | * 96 bytes of Stable Storage is optional [...]. Failure to provide the | |
23 | * optional locations from 96 to 192 results in the loss of certain | |
24 | * functionality during boot." | |
25 | * | |
26 | * Since locations between 96 and 192 are the various paths, most (if not | |
27 | * all) PA-RISC machines should have them. Anyway, for safety reasons, the | |
c7428422 | 28 | * following code can deal with just 96 bytes of Stable Storage, and all |
1da177e4 LT |
29 | * sizes between 96 and 192 bytes (provided they are multiple of struct |
30 | * device_path size, eg: 128, 160 and 192) to provide full information. | |
3f9edb53 TV |
31 | * One last word: there's one path we can always count on: the primary path. |
32 | * Anything above 224 bytes is used for 'osdep2' OS-dependent storage area. | |
33 | * | |
34 | * The first OS-dependent area should always be available. Obviously, this is | |
35 | * not true for the other one. Also bear in mind that reading/writing from/to | |
36 | * osdep2 is much more expensive than from/to osdep1. | |
37 | * NOTE: We do not handle the 2 bytes OS-dep area at 0x5D, nor the first | |
38 | * 2 bytes of storage available right after OSID. That's a total of 4 bytes | |
39 | * sacrificed: -ETOOLAZY :P | |
c7428422 TV |
40 | * |
41 | * The current policy wrt file permissions is: | |
42 | * - write: root only | |
43 | * - read: (reading triggers PDC calls) ? root only : everyone | |
44 | * The rationale is that PDC calls could hog (DoS) the machine. | |
45 | * | |
46 | * TODO: | |
47 | * - timer/fastsize write calls | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #undef PDCS_DEBUG | |
51 | #ifdef PDCS_DEBUG | |
52 | #define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args) | |
53 | #else | |
54 | #define DPRINTK(fmt, args...) | |
55 | #endif | |
56 | ||
57 | #include <linux/module.h> | |
58 | #include <linux/init.h> | |
1da177e4 LT |
59 | #include <linux/kernel.h> |
60 | #include <linux/string.h> | |
c59ede7b | 61 | #include <linux/capability.h> |
1da177e4 LT |
62 | #include <linux/ctype.h> |
63 | #include <linux/sysfs.h> | |
64 | #include <linux/kobject.h> | |
65 | #include <linux/device.h> | |
66 | #include <linux/errno.h> | |
c7428422 | 67 | #include <linux/spinlock.h> |
1da177e4 LT |
68 | |
69 | #include <asm/pdc.h> | |
70 | #include <asm/page.h> | |
71 | #include <asm/uaccess.h> | |
72 | #include <asm/hardware.h> | |
73 | ||
3f9edb53 | 74 | #define PDCS_VERSION "0.30" |
c7428422 | 75 | #define PDCS_PREFIX "PDC Stable Storage" |
1da177e4 LT |
76 | |
77 | #define PDCS_ADDR_PPRI 0x00 | |
78 | #define PDCS_ADDR_OSID 0x40 | |
3f9edb53 TV |
79 | #define PDCS_ADDR_OSD1 0x48 |
80 | #define PDCS_ADDR_DIAG 0x58 | |
1da177e4 LT |
81 | #define PDCS_ADDR_FSIZ 0x5C |
82 | #define PDCS_ADDR_PCON 0x60 | |
83 | #define PDCS_ADDR_PALT 0x80 | |
84 | #define PDCS_ADDR_PKBD 0xA0 | |
3f9edb53 | 85 | #define PDCS_ADDR_OSD2 0xE0 |
1da177e4 LT |
86 | |
87 | MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>"); | |
88 | MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data"); | |
89 | MODULE_LICENSE("GPL"); | |
90 | MODULE_VERSION(PDCS_VERSION); | |
91 | ||
c7428422 | 92 | /* holds Stable Storage size. Initialized once and for all, no lock needed */ |
8039de10 | 93 | static unsigned long pdcs_size __read_mostly; |
1da177e4 | 94 | |
3f9edb53 TV |
95 | /* holds OS ID. Initialized once and for all, hopefully to 0x0006 */ |
96 | static u16 pdcs_osid __read_mostly; | |
97 | ||
1da177e4 LT |
98 | /* This struct defines what we need to deal with a parisc pdc path entry */ |
99 | struct pdcspath_entry { | |
c7428422 | 100 | rwlock_t rw_lock; /* to protect path entry access */ |
1da177e4 LT |
101 | short ready; /* entry record is valid if != 0 */ |
102 | unsigned long addr; /* entry address in stable storage */ | |
103 | char *name; /* entry name */ | |
104 | struct device_path devpath; /* device path in parisc representation */ | |
105 | struct device *dev; /* corresponding device */ | |
106 | struct kobject kobj; | |
107 | }; | |
108 | ||
109 | struct pdcspath_attribute { | |
110 | struct attribute attr; | |
111 | ssize_t (*show)(struct pdcspath_entry *entry, char *buf); | |
112 | ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count); | |
113 | }; | |
114 | ||
115 | #define PDCSPATH_ENTRY(_addr, _name) \ | |
116 | struct pdcspath_entry pdcspath_entry_##_name = { \ | |
117 | .ready = 0, \ | |
118 | .addr = _addr, \ | |
119 | .name = __stringify(_name), \ | |
120 | }; | |
121 | ||
122 | #define PDCS_ATTR(_name, _mode, _show, _store) \ | |
7f548217 | 123 | struct kobj_attribute pdcs_attr_##_name = { \ |
7b595756 | 124 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
125 | .show = _show, \ |
126 | .store = _store, \ | |
127 | }; | |
128 | ||
129 | #define PATHS_ATTR(_name, _mode, _show, _store) \ | |
130 | struct pdcspath_attribute paths_attr_##_name = { \ | |
7b595756 | 131 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
132 | .show = _show, \ |
133 | .store = _store, \ | |
134 | }; | |
135 | ||
136 | #define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr) | |
137 | #define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj) | |
138 | ||
139 | /** | |
140 | * pdcspath_fetch - This function populates the path entry structs. | |
141 | * @entry: A pointer to an allocated pdcspath_entry. | |
142 | * | |
143 | * The general idea is that you don't read from the Stable Storage every time | |
144 | * you access the files provided by the facilites. We store a copy of the | |
145 | * content of the stable storage WRT various paths in these structs. We read | |
146 | * these structs when reading the files, and we will write to these structs when | |
147 | * writing to the files, and only then write them back to the Stable Storage. | |
c7428422 TV |
148 | * |
149 | * This function expects to be called with @entry->rw_lock write-hold. | |
1da177e4 LT |
150 | */ |
151 | static int | |
152 | pdcspath_fetch(struct pdcspath_entry *entry) | |
153 | { | |
154 | struct device_path *devpath; | |
155 | ||
156 | if (!entry) | |
157 | return -EINVAL; | |
158 | ||
159 | devpath = &entry->devpath; | |
160 | ||
161 | DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
162 | entry, devpath, entry->addr); | |
163 | ||
164 | /* addr, devpath and count must be word aligned */ | |
165 | if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) | |
166 | return -EIO; | |
167 | ||
168 | /* Find the matching device. | |
169 | NOTE: hardware_path overlays with device_path, so the nice cast can | |
170 | be used */ | |
171 | entry->dev = hwpath_to_device((struct hardware_path *)devpath); | |
172 | ||
173 | entry->ready = 1; | |
174 | ||
175 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /** | |
181 | * pdcspath_store - This function writes a path to stable storage. | |
182 | * @entry: A pointer to an allocated pdcspath_entry. | |
183 | * | |
184 | * It can be used in two ways: either by passing it a preset devpath struct | |
185 | * containing an already computed hardware path, or by passing it a device | |
186 | * pointer, from which it'll find out the corresponding hardware path. | |
187 | * For now we do not handle the case where there's an error in writing to the | |
188 | * Stable Storage area, so you'd better not mess up the data :P | |
c7428422 TV |
189 | * |
190 | * This function expects to be called with @entry->rw_lock write-hold. | |
1da177e4 | 191 | */ |
c7428422 | 192 | static void |
1da177e4 LT |
193 | pdcspath_store(struct pdcspath_entry *entry) |
194 | { | |
195 | struct device_path *devpath; | |
196 | ||
c7428422 | 197 | BUG_ON(!entry); |
1da177e4 LT |
198 | |
199 | devpath = &entry->devpath; | |
200 | ||
201 | /* We expect the caller to set the ready flag to 0 if the hardware | |
202 | path struct provided is invalid, so that we know we have to fill it. | |
203 | First case, we don't have a preset hwpath... */ | |
204 | if (!entry->ready) { | |
205 | /* ...but we have a device, map it */ | |
c7428422 TV |
206 | BUG_ON(!entry->dev); |
207 | device_to_hwpath(entry->dev, (struct hardware_path *)devpath); | |
1da177e4 LT |
208 | } |
209 | /* else, we expect the provided hwpath to be valid. */ | |
210 | ||
211 | DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
212 | entry, devpath, entry->addr); | |
213 | ||
214 | /* addr, devpath and count must be word aligned */ | |
215 | if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) { | |
216 | printk(KERN_ERR "%s: an error occured when writing to PDC.\n" | |
217 | "It is likely that the Stable Storage data has been corrupted.\n" | |
218 | "Please check it carefully upon next reboot.\n", __func__); | |
c7428422 | 219 | WARN_ON(1); |
1da177e4 LT |
220 | } |
221 | ||
4b991da7 TV |
222 | /* kobject is already registered */ |
223 | entry->ready = 2; | |
1da177e4 LT |
224 | |
225 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
1da177e4 LT |
226 | } |
227 | ||
228 | /** | |
229 | * pdcspath_hwpath_read - This function handles hardware path pretty printing. | |
230 | * @entry: An allocated and populated pdscpath_entry struct. | |
231 | * @buf: The output buffer to write to. | |
232 | * | |
233 | * We will call this function to format the output of the hwpath attribute file. | |
234 | */ | |
235 | static ssize_t | |
236 | pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) | |
237 | { | |
238 | char *out = buf; | |
239 | struct device_path *devpath; | |
c7428422 | 240 | short i; |
1da177e4 LT |
241 | |
242 | if (!entry || !buf) | |
243 | return -EINVAL; | |
244 | ||
c7428422 | 245 | read_lock(&entry->rw_lock); |
1da177e4 | 246 | devpath = &entry->devpath; |
c7428422 TV |
247 | i = entry->ready; |
248 | read_unlock(&entry->rw_lock); | |
1da177e4 | 249 | |
c7428422 | 250 | if (!i) /* entry is not ready */ |
1da177e4 LT |
251 | return -ENODATA; |
252 | ||
253 | for (i = 0; i < 6; i++) { | |
254 | if (devpath->bc[i] >= 128) | |
255 | continue; | |
256 | out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); | |
257 | } | |
258 | out += sprintf(out, "%u\n", (unsigned char)devpath->mod); | |
259 | ||
260 | return out - buf; | |
261 | } | |
262 | ||
263 | /** | |
264 | * pdcspath_hwpath_write - This function handles hardware path modifying. | |
265 | * @entry: An allocated and populated pdscpath_entry struct. | |
266 | * @buf: The input buffer to read from. | |
267 | * @count: The number of bytes to be read. | |
268 | * | |
269 | * We will call this function to change the current hardware path. | |
270 | * Hardware paths are to be given '/'-delimited, without brackets. | |
c7428422 | 271 | * We make sure that the provided path actually maps to an existing |
1da177e4 LT |
272 | * device, BUT nothing would prevent some foolish user to set the path to some |
273 | * PCI bridge or even a CPU... | |
274 | * A better work around would be to make sure we are at the end of a device tree | |
275 | * for instance, but it would be IMHO beyond the simple scope of that driver. | |
276 | * The aim is to provide a facility. Data correctness is left to userland. | |
277 | */ | |
278 | static ssize_t | |
279 | pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
280 | { | |
281 | struct hardware_path hwpath; | |
282 | unsigned short i; | |
283 | char in[count+1], *temp; | |
284 | struct device *dev; | |
26f03249 | 285 | int ret; |
1da177e4 LT |
286 | |
287 | if (!entry || !buf || !count) | |
288 | return -EINVAL; | |
289 | ||
290 | /* We'll use a local copy of buf */ | |
291 | memset(in, 0, count+1); | |
292 | strncpy(in, buf, count); | |
293 | ||
294 | /* Let's clean up the target. 0xff is a blank pattern */ | |
295 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
296 | ||
297 | /* First, pick the mod field (the last one of the input string) */ | |
298 | if (!(temp = strrchr(in, '/'))) | |
299 | return -EINVAL; | |
300 | ||
301 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
302 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
303 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
304 | ||
305 | /* Then, loop for each delimiter, making sure we don't have too many. | |
306 | we write the bc fields in a down-top way. No matter what, we stop | |
307 | before writing the last field. If there are too many fields anyway, | |
308 | then the user is a moron and it'll be caught up later when we'll | |
309 | check the consistency of the given hwpath. */ | |
310 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
311 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
312 | in[temp-in] = '\0'; | |
313 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
314 | } | |
315 | ||
316 | /* Store the final field */ | |
317 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
318 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
319 | ||
320 | /* Now we check that the user isn't trying to lure us */ | |
321 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
322 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
323 | "hardware path: %s\n", __func__, entry->name, buf); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | /* So far so good, let's get in deep */ | |
c7428422 | 328 | write_lock(&entry->rw_lock); |
1da177e4 LT |
329 | entry->ready = 0; |
330 | entry->dev = dev; | |
331 | ||
332 | /* Now, dive in. Write back to the hardware */ | |
c7428422 | 333 | pdcspath_store(entry); |
1da177e4 LT |
334 | |
335 | /* Update the symlink to the real device */ | |
336 | sysfs_remove_link(&entry->kobj, "device"); | |
26f03249 KM |
337 | ret = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); |
338 | WARN_ON(ret); | |
339 | ||
c7428422 | 340 | write_unlock(&entry->rw_lock); |
1da177e4 | 341 | |
c7428422 | 342 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n", |
1da177e4 LT |
343 | entry->name, buf); |
344 | ||
345 | return count; | |
346 | } | |
347 | ||
348 | /** | |
349 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
350 | * @entry: An allocated and populated pdscpath_entry struct. | |
351 | * @buf: The output buffer to write to. | |
352 | * | |
353 | * We will call this function to format the output of the layer attribute file. | |
354 | */ | |
355 | static ssize_t | |
356 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
357 | { | |
358 | char *out = buf; | |
359 | struct device_path *devpath; | |
c7428422 | 360 | short i; |
1da177e4 LT |
361 | |
362 | if (!entry || !buf) | |
363 | return -EINVAL; | |
364 | ||
c7428422 | 365 | read_lock(&entry->rw_lock); |
1da177e4 | 366 | devpath = &entry->devpath; |
c7428422 TV |
367 | i = entry->ready; |
368 | read_unlock(&entry->rw_lock); | |
1da177e4 | 369 | |
c7428422 | 370 | if (!i) /* entry is not ready */ |
1da177e4 LT |
371 | return -ENODATA; |
372 | ||
447c233d | 373 | for (i = 0; i < 6 && devpath->layers[i]; i++) |
1da177e4 LT |
374 | out += sprintf(out, "%u ", devpath->layers[i]); |
375 | ||
376 | out += sprintf(out, "\n"); | |
377 | ||
378 | return out - buf; | |
379 | } | |
380 | ||
381 | /** | |
382 | * pdcspath_layer_write - This function handles extended layer modifying. | |
383 | * @entry: An allocated and populated pdscpath_entry struct. | |
384 | * @buf: The input buffer to read from. | |
385 | * @count: The number of bytes to be read. | |
386 | * | |
387 | * We will call this function to change the current layer value. | |
388 | * Layers are to be given '.'-delimited, without brackets. | |
389 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
390 | * Potential harm can be done, since there's no way to check the validity of | |
391 | * the layer fields. | |
392 | */ | |
393 | static ssize_t | |
394 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
395 | { | |
396 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
397 | unsigned short i; | |
398 | char in[count+1], *temp; | |
399 | ||
400 | if (!entry || !buf || !count) | |
401 | return -EINVAL; | |
402 | ||
403 | /* We'll use a local copy of buf */ | |
404 | memset(in, 0, count+1); | |
405 | strncpy(in, buf, count); | |
406 | ||
407 | /* Let's clean up the target. 0 is a blank pattern */ | |
408 | memset(&layers, 0, sizeof(layers)); | |
409 | ||
410 | /* First, pick the first layer */ | |
411 | if (unlikely(!isdigit(*in))) | |
412 | return -EINVAL; | |
413 | layers[0] = simple_strtoul(in, NULL, 10); | |
414 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
415 | ||
416 | temp = in; | |
417 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
418 | if (unlikely(!isdigit(*(++temp)))) | |
419 | return -EINVAL; | |
420 | layers[i] = simple_strtoul(temp, NULL, 10); | |
421 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
422 | } | |
423 | ||
424 | /* So far so good, let's get in deep */ | |
c7428422 | 425 | write_lock(&entry->rw_lock); |
1da177e4 LT |
426 | |
427 | /* First, overwrite the current layers with the new ones, not touching | |
428 | the hardware path. */ | |
429 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
430 | ||
431 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
432 | pdcspath_store(entry); |
433 | write_unlock(&entry->rw_lock); | |
1da177e4 | 434 | |
c7428422 | 435 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n", |
1da177e4 LT |
436 | entry->name, buf); |
437 | ||
438 | return count; | |
439 | } | |
440 | ||
441 | /** | |
442 | * pdcspath_attr_show - Generic read function call wrapper. | |
443 | * @kobj: The kobject to get info from. | |
444 | * @attr: The attribute looked upon. | |
445 | * @buf: The output buffer. | |
446 | */ | |
447 | static ssize_t | |
448 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
449 | { | |
450 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
451 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
452 | ssize_t ret = 0; | |
453 | ||
1da177e4 LT |
454 | if (pdcs_attr->show) |
455 | ret = pdcs_attr->show(entry, buf); | |
456 | ||
457 | return ret; | |
458 | } | |
459 | ||
460 | /** | |
461 | * pdcspath_attr_store - Generic write function call wrapper. | |
462 | * @kobj: The kobject to write info to. | |
463 | * @attr: The attribute to be modified. | |
464 | * @buf: The input buffer. | |
465 | * @count: The size of the buffer. | |
466 | */ | |
467 | static ssize_t | |
468 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
469 | const char *buf, size_t count) | |
470 | { | |
471 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
472 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
473 | ssize_t ret = 0; | |
474 | ||
475 | if (!capable(CAP_SYS_ADMIN)) | |
476 | return -EACCES; | |
477 | ||
478 | if (pdcs_attr->store) | |
479 | ret = pdcs_attr->store(entry, buf, count); | |
480 | ||
481 | return ret; | |
482 | } | |
483 | ||
484 | static struct sysfs_ops pdcspath_attr_ops = { | |
485 | .show = pdcspath_attr_show, | |
486 | .store = pdcspath_attr_store, | |
487 | }; | |
488 | ||
489 | /* These are the two attributes of any PDC path. */ | |
c7428422 TV |
490 | static PATHS_ATTR(hwpath, 0644, pdcspath_hwpath_read, pdcspath_hwpath_write); |
491 | static PATHS_ATTR(layer, 0644, pdcspath_layer_read, pdcspath_layer_write); | |
1da177e4 LT |
492 | |
493 | static struct attribute *paths_subsys_attrs[] = { | |
494 | &paths_attr_hwpath.attr, | |
495 | &paths_attr_layer.attr, | |
496 | NULL, | |
497 | }; | |
498 | ||
499 | /* Specific kobject type for our PDC paths */ | |
500 | static struct kobj_type ktype_pdcspath = { | |
501 | .sysfs_ops = &pdcspath_attr_ops, | |
502 | .default_attrs = paths_subsys_attrs, | |
503 | }; | |
504 | ||
505 | /* We hard define the 4 types of path we expect to find */ | |
506 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
507 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
508 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
509 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
510 | ||
511 | /* An array containing all PDC paths we will deal with */ | |
512 | static struct pdcspath_entry *pdcspath_entries[] = { | |
513 | &pdcspath_entry_primary, | |
514 | &pdcspath_entry_alternative, | |
515 | &pdcspath_entry_console, | |
516 | &pdcspath_entry_keyboard, | |
517 | NULL, | |
518 | }; | |
519 | ||
c7428422 TV |
520 | |
521 | /* For more insight of what's going on here, refer to PDC Procedures doc, | |
522 | * Section PDC_STABLE */ | |
523 | ||
1da177e4 | 524 | /** |
c7428422 | 525 | * pdcs_size_read - Stable Storage size output. |
1da177e4 | 526 | * @buf: The output buffer to write to. |
1da177e4 | 527 | */ |
7f548217 GKH |
528 | static ssize_t pdcs_size_read(struct kobject *kobj, |
529 | struct kobj_attribute *attr, | |
530 | char *buf) | |
1da177e4 LT |
531 | { |
532 | char *out = buf; | |
823bccfc | 533 | |
7f548217 | 534 | if (!buf) |
1da177e4 | 535 | return -EINVAL; |
823bccfc | 536 | |
1da177e4 | 537 | /* show the size of the stable storage */ |
c7428422 | 538 | out += sprintf(out, "%ld\n", pdcs_size); |
1da177e4 | 539 | |
c7428422 TV |
540 | return out - buf; |
541 | } | |
542 | ||
543 | /** | |
544 | * pdcs_auto_read - Stable Storage autoboot/search flag output. | |
c7428422 TV |
545 | * @buf: The output buffer to write to. |
546 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag | |
547 | */ | |
7f548217 GKH |
548 | static ssize_t pdcs_auto_read(struct kobject *kobj, |
549 | struct kobj_attribute *attr, | |
550 | char *buf, int knob) | |
c7428422 TV |
551 | { |
552 | char *out = buf; | |
553 | struct pdcspath_entry *pathentry; | |
67a5a59d | 554 | |
7f548217 | 555 | if (!buf) |
c7428422 TV |
556 | return -EINVAL; |
557 | ||
558 | /* Current flags are stored in primary boot path entry */ | |
559 | pathentry = &pdcspath_entry_primary; | |
560 | ||
561 | read_lock(&pathentry->rw_lock); | |
562 | out += sprintf(out, "%s\n", (pathentry->devpath.flags & knob) ? | |
563 | "On" : "Off"); | |
564 | read_unlock(&pathentry->rw_lock); | |
565 | ||
566 | return out - buf; | |
567 | } | |
568 | ||
569 | /** | |
570 | * pdcs_autoboot_read - Stable Storage autoboot flag output. | |
c7428422 TV |
571 | * @buf: The output buffer to write to. |
572 | */ | |
7f548217 GKH |
573 | static ssize_t pdcs_autoboot_read(struct kobject *kobj, |
574 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 575 | { |
7f548217 | 576 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOBOOT); |
c7428422 TV |
577 | } |
578 | ||
579 | /** | |
580 | * pdcs_autosearch_read - Stable Storage autoboot flag output. | |
c7428422 TV |
581 | * @buf: The output buffer to write to. |
582 | */ | |
7f548217 GKH |
583 | static ssize_t pdcs_autosearch_read(struct kobject *kobj, |
584 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 585 | { |
7f548217 | 586 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOSEARCH); |
c7428422 TV |
587 | } |
588 | ||
589 | /** | |
590 | * pdcs_timer_read - Stable Storage timer count output (in seconds). | |
c7428422 TV |
591 | * @buf: The output buffer to write to. |
592 | * | |
593 | * The value of the timer field correponds to a number of seconds in powers of 2. | |
594 | */ | |
7f548217 GKH |
595 | static ssize_t pdcs_timer_read(struct kobject *kobj, |
596 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
597 | { |
598 | char *out = buf; | |
599 | struct pdcspath_entry *pathentry; | |
600 | ||
7f548217 | 601 | if (!buf) |
c7428422 TV |
602 | return -EINVAL; |
603 | ||
604 | /* Current flags are stored in primary boot path entry */ | |
605 | pathentry = &pdcspath_entry_primary; | |
606 | ||
607 | /* print the timer value in seconds */ | |
608 | read_lock(&pathentry->rw_lock); | |
609 | out += sprintf(out, "%u\n", (pathentry->devpath.flags & PF_TIMER) ? | |
610 | (1 << (pathentry->devpath.flags & PF_TIMER)) : 0); | |
611 | read_unlock(&pathentry->rw_lock); | |
612 | ||
613 | return out - buf; | |
614 | } | |
615 | ||
616 | /** | |
617 | * pdcs_osid_read - Stable Storage OS ID register output. | |
c7428422 TV |
618 | * @buf: The output buffer to write to. |
619 | */ | |
7f548217 GKH |
620 | static ssize_t pdcs_osid_read(struct kobject *kobj, |
621 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
622 | { |
623 | char *out = buf; | |
c7428422 | 624 | |
7f548217 | 625 | if (!buf) |
c7428422 | 626 | return -EINVAL; |
1da177e4 | 627 | |
67a061a1 KM |
628 | out += sprintf(out, "%s dependent data (0x%.4x)\n", |
629 | os_id_to_string(pdcs_osid), pdcs_osid); | |
3f9edb53 TV |
630 | |
631 | return out - buf; | |
632 | } | |
633 | ||
634 | /** | |
635 | * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output. | |
3f9edb53 TV |
636 | * @buf: The output buffer to write to. |
637 | * | |
638 | * This can hold 16 bytes of OS-Dependent data. | |
639 | */ | |
7f548217 GKH |
640 | static ssize_t pdcs_osdep1_read(struct kobject *kobj, |
641 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
642 | { |
643 | char *out = buf; | |
644 | u32 result[4]; | |
645 | ||
7f548217 | 646 | if (!buf) |
3f9edb53 TV |
647 | return -EINVAL; |
648 | ||
649 | if (pdc_stable_read(PDCS_ADDR_OSD1, &result, sizeof(result)) != PDC_OK) | |
650 | return -EIO; | |
651 | ||
652 | out += sprintf(out, "0x%.8x\n", result[0]); | |
653 | out += sprintf(out, "0x%.8x\n", result[1]); | |
654 | out += sprintf(out, "0x%.8x\n", result[2]); | |
655 | out += sprintf(out, "0x%.8x\n", result[3]); | |
656 | ||
657 | return out - buf; | |
658 | } | |
659 | ||
660 | /** | |
661 | * pdcs_diagnostic_read - Stable Storage Diagnostic register output. | |
3f9edb53 TV |
662 | * @buf: The output buffer to write to. |
663 | * | |
664 | * I have NFC how to interpret the content of that register ;-). | |
665 | */ | |
7f548217 GKH |
666 | static ssize_t pdcs_diagnostic_read(struct kobject *kobj, |
667 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
668 | { |
669 | char *out = buf; | |
670 | u32 result; | |
671 | ||
7f548217 | 672 | if (!buf) |
3f9edb53 TV |
673 | return -EINVAL; |
674 | ||
675 | /* get diagnostic */ | |
676 | if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK) | |
677 | return -EIO; | |
678 | ||
679 | out += sprintf(out, "0x%.4x\n", (result >> 16)); | |
c7428422 TV |
680 | |
681 | return out - buf; | |
682 | } | |
683 | ||
684 | /** | |
685 | * pdcs_fastsize_read - Stable Storage FastSize register output. | |
c7428422 TV |
686 | * @buf: The output buffer to write to. |
687 | * | |
688 | * This register holds the amount of system RAM to be tested during boot sequence. | |
689 | */ | |
7f548217 GKH |
690 | static ssize_t pdcs_fastsize_read(struct kobject *kobj, |
691 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
692 | { |
693 | char *out = buf; | |
3f9edb53 | 694 | u32 result; |
c7428422 | 695 | |
7f548217 | 696 | if (!buf) |
c7428422 | 697 | return -EINVAL; |
1da177e4 LT |
698 | |
699 | /* get fast-size */ | |
700 | if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) | |
701 | return -EIO; | |
702 | ||
1da177e4 | 703 | if ((result & 0x0F) < 0x0E) |
abff7543 | 704 | out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); |
1da177e4 LT |
705 | else |
706 | out += sprintf(out, "All"); | |
707 | out += sprintf(out, "\n"); | |
708 | ||
709 | return out - buf; | |
710 | } | |
711 | ||
3f9edb53 TV |
712 | /** |
713 | * pdcs_osdep2_read - Stable Storage OS-Dependent data area 2 output. | |
3f9edb53 TV |
714 | * @buf: The output buffer to write to. |
715 | * | |
716 | * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available. | |
717 | */ | |
7f548217 GKH |
718 | static ssize_t pdcs_osdep2_read(struct kobject *kobj, |
719 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
720 | { |
721 | char *out = buf; | |
722 | unsigned long size; | |
723 | unsigned short i; | |
724 | u32 result; | |
725 | ||
726 | if (unlikely(pdcs_size <= 224)) | |
727 | return -ENODATA; | |
728 | ||
729 | size = pdcs_size - 224; | |
730 | ||
7f548217 | 731 | if (!buf) |
3f9edb53 TV |
732 | return -EINVAL; |
733 | ||
734 | for (i=0; i<size; i+=4) { | |
735 | if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result, | |
736 | sizeof(result)) != PDC_OK)) | |
737 | return -EIO; | |
738 | out += sprintf(out, "0x%.8x\n", result); | |
739 | } | |
740 | ||
741 | return out - buf; | |
742 | } | |
743 | ||
1da177e4 | 744 | /** |
c7428422 | 745 | * pdcs_auto_write - This function handles autoboot/search flag modifying. |
1da177e4 LT |
746 | * @buf: The input buffer to read from. |
747 | * @count: The number of bytes to be read. | |
c7428422 | 748 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag |
1da177e4 | 749 | * |
c7428422 | 750 | * We will call this function to change the current autoboot flag. |
1da177e4 | 751 | * We expect a precise syntax: |
c7428422 | 752 | * \"n\" (n == 0 or 1) to toggle AutoBoot Off or On |
1da177e4 | 753 | */ |
7f548217 GKH |
754 | static ssize_t pdcs_auto_write(struct kobject *kobj, |
755 | struct kobj_attribute *attr, const char *buf, | |
756 | size_t count, int knob) | |
1da177e4 LT |
757 | { |
758 | struct pdcspath_entry *pathentry; | |
759 | unsigned char flags; | |
760 | char in[count+1], *temp; | |
761 | char c; | |
762 | ||
763 | if (!capable(CAP_SYS_ADMIN)) | |
764 | return -EACCES; | |
765 | ||
7f548217 | 766 | if (!buf || !count) |
1da177e4 LT |
767 | return -EINVAL; |
768 | ||
769 | /* We'll use a local copy of buf */ | |
770 | memset(in, 0, count+1); | |
771 | strncpy(in, buf, count); | |
772 | ||
773 | /* Current flags are stored in primary boot path entry */ | |
774 | pathentry = &pdcspath_entry_primary; | |
775 | ||
776 | /* Be nice to the existing flag record */ | |
c7428422 | 777 | read_lock(&pathentry->rw_lock); |
1da177e4 | 778 | flags = pathentry->devpath.flags; |
c7428422 | 779 | read_unlock(&pathentry->rw_lock); |
1da177e4 LT |
780 | |
781 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
e7d2860b AGR |
782 | |
783 | temp = skip_spaces(in); | |
784 | ||
1da177e4 LT |
785 | c = *temp++ - '0'; |
786 | if ((c != 0) && (c != 1)) | |
787 | goto parse_error; | |
788 | if (c == 0) | |
c7428422 | 789 | flags &= ~knob; |
1da177e4 | 790 | else |
c7428422 | 791 | flags |= knob; |
1da177e4 LT |
792 | |
793 | DPRINTK("%s: flags after: 0x%X\n", __func__, flags); | |
794 | ||
795 | /* So far so good, let's get in deep */ | |
c7428422 | 796 | write_lock(&pathentry->rw_lock); |
1da177e4 LT |
797 | |
798 | /* Change the path entry flags first */ | |
799 | pathentry->devpath.flags = flags; | |
800 | ||
801 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
802 | pdcspath_store(pathentry); |
803 | write_unlock(&pathentry->rw_lock); | |
1da177e4 | 804 | |
c7428422 TV |
805 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" to \"%s\"\n", |
806 | (knob & PF_AUTOBOOT) ? "autoboot" : "autosearch", | |
807 | (flags & knob) ? "On" : "Off"); | |
1da177e4 LT |
808 | |
809 | return count; | |
810 | ||
811 | parse_error: | |
c7428422 | 812 | printk(KERN_WARNING "%s: Parse error: expect \"n\" (n == 0 or 1)\n", __func__); |
1da177e4 LT |
813 | return -EINVAL; |
814 | } | |
815 | ||
c7428422 TV |
816 | /** |
817 | * pdcs_autoboot_write - This function handles autoboot flag modifying. | |
c7428422 TV |
818 | * @buf: The input buffer to read from. |
819 | * @count: The number of bytes to be read. | |
820 | * | |
821 | * We will call this function to change the current boot flags. | |
822 | * We expect a precise syntax: | |
823 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
824 | */ | |
7f548217 GKH |
825 | static ssize_t pdcs_autoboot_write(struct kobject *kobj, |
826 | struct kobj_attribute *attr, | |
827 | const char *buf, size_t count) | |
c7428422 | 828 | { |
ff451d70 | 829 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOBOOT); |
c7428422 TV |
830 | } |
831 | ||
832 | /** | |
833 | * pdcs_autosearch_write - This function handles autosearch flag modifying. | |
c7428422 TV |
834 | * @buf: The input buffer to read from. |
835 | * @count: The number of bytes to be read. | |
836 | * | |
837 | * We will call this function to change the current boot flags. | |
838 | * We expect a precise syntax: | |
839 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
840 | */ | |
7f548217 GKH |
841 | static ssize_t pdcs_autosearch_write(struct kobject *kobj, |
842 | struct kobj_attribute *attr, | |
843 | const char *buf, size_t count) | |
c7428422 | 844 | { |
ff451d70 | 845 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOSEARCH); |
c7428422 TV |
846 | } |
847 | ||
3f9edb53 TV |
848 | /** |
849 | * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input. | |
3f9edb53 TV |
850 | * @buf: The input buffer to read from. |
851 | * @count: The number of bytes to be read. | |
852 | * | |
853 | * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte | |
854 | * write approach. It's up to userspace to deal with it when constructing | |
855 | * its input buffer. | |
856 | */ | |
7f548217 GKH |
857 | static ssize_t pdcs_osdep1_write(struct kobject *kobj, |
858 | struct kobj_attribute *attr, | |
859 | const char *buf, size_t count) | |
3f9edb53 TV |
860 | { |
861 | u8 in[16]; | |
862 | ||
863 | if (!capable(CAP_SYS_ADMIN)) | |
864 | return -EACCES; | |
865 | ||
7f548217 | 866 | if (!buf || !count) |
3f9edb53 TV |
867 | return -EINVAL; |
868 | ||
ec1fdc24 | 869 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
870 | return -EPERM; |
871 | ||
872 | if (count > 16) | |
873 | return -EMSGSIZE; | |
874 | ||
875 | /* We'll use a local copy of buf */ | |
876 | memset(in, 0, 16); | |
877 | memcpy(in, buf, count); | |
878 | ||
879 | if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK) | |
880 | return -EIO; | |
881 | ||
882 | return count; | |
883 | } | |
884 | ||
885 | /** | |
886 | * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input. | |
3f9edb53 TV |
887 | * @buf: The input buffer to read from. |
888 | * @count: The number of bytes to be read. | |
889 | * | |
890 | * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a | |
891 | * byte-by-byte write approach. It's up to userspace to deal with it when | |
892 | * constructing its input buffer. | |
893 | */ | |
7f548217 GKH |
894 | static ssize_t pdcs_osdep2_write(struct kobject *kobj, |
895 | struct kobj_attribute *attr, | |
896 | const char *buf, size_t count) | |
3f9edb53 TV |
897 | { |
898 | unsigned long size; | |
899 | unsigned short i; | |
900 | u8 in[4]; | |
901 | ||
902 | if (!capable(CAP_SYS_ADMIN)) | |
903 | return -EACCES; | |
904 | ||
7f548217 | 905 | if (!buf || !count) |
3f9edb53 TV |
906 | return -EINVAL; |
907 | ||
908 | if (unlikely(pdcs_size <= 224)) | |
909 | return -ENOSYS; | |
910 | ||
ec1fdc24 | 911 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
912 | return -EPERM; |
913 | ||
914 | size = pdcs_size - 224; | |
915 | ||
916 | if (count > size) | |
917 | return -EMSGSIZE; | |
918 | ||
919 | /* We'll use a local copy of buf */ | |
920 | ||
921 | for (i=0; i<count; i+=4) { | |
922 | memset(in, 0, 4); | |
923 | memcpy(in, buf+i, (count-i < 4) ? count-i : 4); | |
924 | if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in, | |
925 | sizeof(in)) != PDC_OK)) | |
926 | return -EIO; | |
927 | } | |
928 | ||
929 | return count; | |
930 | } | |
931 | ||
c7428422 TV |
932 | /* The remaining attributes. */ |
933 | static PDCS_ATTR(size, 0444, pdcs_size_read, NULL); | |
934 | static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write); | |
935 | static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write); | |
936 | static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL); | |
3f9edb53 TV |
937 | static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL); |
938 | static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write); | |
939 | static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL); | |
c7428422 | 940 | static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL); |
3f9edb53 | 941 | static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write); |
1da177e4 | 942 | |
7f548217 GKH |
943 | static struct attribute *pdcs_subsys_attrs[] = { |
944 | &pdcs_attr_size.attr, | |
945 | &pdcs_attr_autoboot.attr, | |
946 | &pdcs_attr_autosearch.attr, | |
947 | &pdcs_attr_timer.attr, | |
948 | &pdcs_attr_osid.attr, | |
949 | &pdcs_attr_osdep1.attr, | |
950 | &pdcs_attr_diagnostic.attr, | |
951 | &pdcs_attr_fastsize.attr, | |
952 | &pdcs_attr_osdep2.attr, | |
c7428422 | 953 | NULL, |
1da177e4 LT |
954 | }; |
955 | ||
7f548217 GKH |
956 | static struct attribute_group pdcs_attr_group = { |
957 | .attrs = pdcs_subsys_attrs, | |
958 | }; | |
959 | ||
c829a5b4 | 960 | static struct kobject *stable_kobj; |
4443d07f | 961 | static struct kset *paths_kset; |
1da177e4 LT |
962 | |
963 | /** | |
964 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
965 | * | |
966 | * It creates kobjects corresponding to each path entry with nice sysfs | |
967 | * links to the real device. This is where the magic takes place: when | |
968 | * registering the subsystem attributes during module init, each kobject hereby | |
969 | * created will show in the sysfs tree as a folder containing files as defined | |
970 | * by path_subsys_attr[]. | |
971 | */ | |
972 | static inline int __init | |
973 | pdcs_register_pathentries(void) | |
974 | { | |
975 | unsigned short i; | |
976 | struct pdcspath_entry *entry; | |
4b991da7 | 977 | int err; |
1da177e4 | 978 | |
c7428422 TV |
979 | /* Initialize the entries rw_lock before anything else */ |
980 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
981 | rwlock_init(&entry->rw_lock); | |
982 | ||
1da177e4 | 983 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
c7428422 TV |
984 | write_lock(&entry->rw_lock); |
985 | err = pdcspath_fetch(entry); | |
986 | write_unlock(&entry->rw_lock); | |
987 | ||
988 | if (err < 0) | |
1da177e4 LT |
989 | continue; |
990 | ||
4443d07f | 991 | entry->kobj.kset = paths_kset; |
73f368cf GKH |
992 | err = kobject_init_and_add(&entry->kobj, &ktype_pdcspath, NULL, |
993 | "%s", entry->name); | |
994 | if (err) | |
4b991da7 | 995 | return err; |
73f368cf | 996 | |
4b991da7 | 997 | /* kobject is now registered */ |
c7428422 | 998 | write_lock(&entry->rw_lock); |
4b991da7 TV |
999 | entry->ready = 2; |
1000 | ||
1da177e4 | 1001 | /* Add a nice symlink to the real device */ |
26f03249 KM |
1002 | if (entry->dev) { |
1003 | err = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
1004 | WARN_ON(err); | |
1005 | } | |
c7428422 TV |
1006 | |
1007 | write_unlock(&entry->rw_lock); | |
73f368cf | 1008 | kobject_uevent(&entry->kobj, KOBJ_ADD); |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
1016 | */ | |
4b991da7 | 1017 | static inline void |
1da177e4 LT |
1018 | pdcs_unregister_pathentries(void) |
1019 | { | |
1020 | unsigned short i; | |
1021 | struct pdcspath_entry *entry; | |
1022 | ||
c7428422 TV |
1023 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
1024 | read_lock(&entry->rw_lock); | |
4b991da7 | 1025 | if (entry->ready >= 2) |
c10997f6 | 1026 | kobject_put(&entry->kobj); |
c7428422 TV |
1027 | read_unlock(&entry->rw_lock); |
1028 | } | |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | /* | |
c7428422 TV |
1032 | * For now we register the stable subsystem with the firmware subsystem |
1033 | * and the paths subsystem with the stable subsystem | |
1da177e4 LT |
1034 | */ |
1035 | static int __init | |
1036 | pdc_stable_init(void) | |
1037 | { | |
7f548217 | 1038 | int rc = 0, error = 0; |
3f9edb53 | 1039 | u32 result; |
1da177e4 LT |
1040 | |
1041 | /* find the size of the stable storage */ | |
1042 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
1043 | return -ENODEV; | |
1044 | ||
c7428422 TV |
1045 | /* make sure we have enough data */ |
1046 | if (pdcs_size < 96) | |
1047 | return -ENODATA; | |
1048 | ||
1049 | printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION); | |
1da177e4 | 1050 | |
3f9edb53 TV |
1051 | /* get OSID */ |
1052 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
1053 | return -EIO; | |
1054 | ||
1055 | /* the actual result is 16 bits away */ | |
1056 | pdcs_osid = (u16)(result >> 16); | |
1057 | ||
c829a5b4 GKH |
1058 | /* For now we'll register the directory at /sys/firmware/stable */ |
1059 | stable_kobj = kobject_create_and_add("stable", firmware_kobj); | |
1060 | if (!stable_kobj) { | |
4443d07f | 1061 | rc = -ENOMEM; |
4b991da7 | 1062 | goto fail_firmreg; |
4443d07f | 1063 | } |
1da177e4 | 1064 | |
c7428422 | 1065 | /* Don't forget the root entries */ |
ff451d70 | 1066 | error = sysfs_create_group(stable_kobj, &pdcs_attr_group); |
7f548217 | 1067 | |
4443d07f | 1068 | /* register the paths kset as a child of the stable kset */ |
c829a5b4 | 1069 | paths_kset = kset_create_and_add("paths", NULL, stable_kobj); |
4443d07f GKH |
1070 | if (!paths_kset) { |
1071 | rc = -ENOMEM; | |
1072 | goto fail_ksetreg; | |
1073 | } | |
1da177e4 | 1074 | |
4443d07f | 1075 | /* now we create all "files" for the paths kset */ |
4b991da7 TV |
1076 | if ((rc = pdcs_register_pathentries())) |
1077 | goto fail_pdcsreg; | |
1078 | ||
1079 | return rc; | |
1da177e4 | 1080 | |
4b991da7 TV |
1081 | fail_pdcsreg: |
1082 | pdcs_unregister_pathentries(); | |
4443d07f | 1083 | kset_unregister(paths_kset); |
4b991da7 | 1084 | |
4443d07f | 1085 | fail_ksetreg: |
c10997f6 | 1086 | kobject_put(stable_kobj); |
4b991da7 TV |
1087 | |
1088 | fail_firmreg: | |
c7428422 | 1089 | printk(KERN_INFO PDCS_PREFIX " bailing out\n"); |
4b991da7 | 1090 | return rc; |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | static void __exit | |
1094 | pdc_stable_exit(void) | |
1095 | { | |
1096 | pdcs_unregister_pathentries(); | |
4443d07f | 1097 | kset_unregister(paths_kset); |
c10997f6 | 1098 | kobject_put(stable_kobj); |
1da177e4 LT |
1099 | } |
1100 | ||
1101 | ||
1102 | module_init(pdc_stable_init); | |
1103 | module_exit(pdc_stable_exit); |