Commit | Line | Data |
---|---|---|
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) \ | |
123 | struct subsys_attribute pdcs_attr_##_name = { \ | |
124 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | |
125 | .show = _show, \ | |
126 | .store = _store, \ | |
127 | }; | |
128 | ||
129 | #define PATHS_ATTR(_name, _mode, _show, _store) \ | |
130 | struct pdcspath_attribute paths_attr_##_name = { \ | |
131 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | |
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; | |
285 | ||
286 | if (!entry || !buf || !count) | |
287 | return -EINVAL; | |
288 | ||
289 | /* We'll use a local copy of buf */ | |
290 | memset(in, 0, count+1); | |
291 | strncpy(in, buf, count); | |
292 | ||
293 | /* Let's clean up the target. 0xff is a blank pattern */ | |
294 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
295 | ||
296 | /* First, pick the mod field (the last one of the input string) */ | |
297 | if (!(temp = strrchr(in, '/'))) | |
298 | return -EINVAL; | |
299 | ||
300 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
301 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
302 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
303 | ||
304 | /* Then, loop for each delimiter, making sure we don't have too many. | |
305 | we write the bc fields in a down-top way. No matter what, we stop | |
306 | before writing the last field. If there are too many fields anyway, | |
307 | then the user is a moron and it'll be caught up later when we'll | |
308 | check the consistency of the given hwpath. */ | |
309 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
310 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
311 | in[temp-in] = '\0'; | |
312 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
313 | } | |
314 | ||
315 | /* Store the final field */ | |
316 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
317 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
318 | ||
319 | /* Now we check that the user isn't trying to lure us */ | |
320 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
321 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
322 | "hardware path: %s\n", __func__, entry->name, buf); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | /* So far so good, let's get in deep */ | |
c7428422 | 327 | write_lock(&entry->rw_lock); |
1da177e4 LT |
328 | entry->ready = 0; |
329 | entry->dev = dev; | |
330 | ||
331 | /* Now, dive in. Write back to the hardware */ | |
c7428422 | 332 | pdcspath_store(entry); |
1da177e4 LT |
333 | |
334 | /* Update the symlink to the real device */ | |
335 | sysfs_remove_link(&entry->kobj, "device"); | |
336 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
c7428422 | 337 | write_unlock(&entry->rw_lock); |
1da177e4 | 338 | |
c7428422 | 339 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n", |
1da177e4 LT |
340 | entry->name, buf); |
341 | ||
342 | return count; | |
343 | } | |
344 | ||
345 | /** | |
346 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
347 | * @entry: An allocated and populated pdscpath_entry struct. | |
348 | * @buf: The output buffer to write to. | |
349 | * | |
350 | * We will call this function to format the output of the layer attribute file. | |
351 | */ | |
352 | static ssize_t | |
353 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
354 | { | |
355 | char *out = buf; | |
356 | struct device_path *devpath; | |
c7428422 | 357 | short i; |
1da177e4 LT |
358 | |
359 | if (!entry || !buf) | |
360 | return -EINVAL; | |
361 | ||
c7428422 | 362 | read_lock(&entry->rw_lock); |
1da177e4 | 363 | devpath = &entry->devpath; |
c7428422 TV |
364 | i = entry->ready; |
365 | read_unlock(&entry->rw_lock); | |
1da177e4 | 366 | |
c7428422 | 367 | if (!i) /* entry is not ready */ |
1da177e4 LT |
368 | return -ENODATA; |
369 | ||
370 | for (i = 0; devpath->layers[i] && (likely(i < 6)); i++) | |
371 | out += sprintf(out, "%u ", devpath->layers[i]); | |
372 | ||
373 | out += sprintf(out, "\n"); | |
374 | ||
375 | return out - buf; | |
376 | } | |
377 | ||
378 | /** | |
379 | * pdcspath_layer_write - This function handles extended layer modifying. | |
380 | * @entry: An allocated and populated pdscpath_entry struct. | |
381 | * @buf: The input buffer to read from. | |
382 | * @count: The number of bytes to be read. | |
383 | * | |
384 | * We will call this function to change the current layer value. | |
385 | * Layers are to be given '.'-delimited, without brackets. | |
386 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
387 | * Potential harm can be done, since there's no way to check the validity of | |
388 | * the layer fields. | |
389 | */ | |
390 | static ssize_t | |
391 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
392 | { | |
393 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
394 | unsigned short i; | |
395 | char in[count+1], *temp; | |
396 | ||
397 | if (!entry || !buf || !count) | |
398 | return -EINVAL; | |
399 | ||
400 | /* We'll use a local copy of buf */ | |
401 | memset(in, 0, count+1); | |
402 | strncpy(in, buf, count); | |
403 | ||
404 | /* Let's clean up the target. 0 is a blank pattern */ | |
405 | memset(&layers, 0, sizeof(layers)); | |
406 | ||
407 | /* First, pick the first layer */ | |
408 | if (unlikely(!isdigit(*in))) | |
409 | return -EINVAL; | |
410 | layers[0] = simple_strtoul(in, NULL, 10); | |
411 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
412 | ||
413 | temp = in; | |
414 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
415 | if (unlikely(!isdigit(*(++temp)))) | |
416 | return -EINVAL; | |
417 | layers[i] = simple_strtoul(temp, NULL, 10); | |
418 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
419 | } | |
420 | ||
421 | /* So far so good, let's get in deep */ | |
c7428422 | 422 | write_lock(&entry->rw_lock); |
1da177e4 LT |
423 | |
424 | /* First, overwrite the current layers with the new ones, not touching | |
425 | the hardware path. */ | |
426 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
427 | ||
428 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
429 | pdcspath_store(entry); |
430 | write_unlock(&entry->rw_lock); | |
1da177e4 | 431 | |
c7428422 | 432 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n", |
1da177e4 LT |
433 | entry->name, buf); |
434 | ||
435 | return count; | |
436 | } | |
437 | ||
438 | /** | |
439 | * pdcspath_attr_show - Generic read function call wrapper. | |
440 | * @kobj: The kobject to get info from. | |
441 | * @attr: The attribute looked upon. | |
442 | * @buf: The output buffer. | |
443 | */ | |
444 | static ssize_t | |
445 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
446 | { | |
447 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
448 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
449 | ssize_t ret = 0; | |
450 | ||
1da177e4 LT |
451 | if (pdcs_attr->show) |
452 | ret = pdcs_attr->show(entry, buf); | |
453 | ||
454 | return ret; | |
455 | } | |
456 | ||
457 | /** | |
458 | * pdcspath_attr_store - Generic write function call wrapper. | |
459 | * @kobj: The kobject to write info to. | |
460 | * @attr: The attribute to be modified. | |
461 | * @buf: The input buffer. | |
462 | * @count: The size of the buffer. | |
463 | */ | |
464 | static ssize_t | |
465 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
466 | const char *buf, size_t count) | |
467 | { | |
468 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
469 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
470 | ssize_t ret = 0; | |
471 | ||
472 | if (!capable(CAP_SYS_ADMIN)) | |
473 | return -EACCES; | |
474 | ||
475 | if (pdcs_attr->store) | |
476 | ret = pdcs_attr->store(entry, buf, count); | |
477 | ||
478 | return ret; | |
479 | } | |
480 | ||
481 | static struct sysfs_ops pdcspath_attr_ops = { | |
482 | .show = pdcspath_attr_show, | |
483 | .store = pdcspath_attr_store, | |
484 | }; | |
485 | ||
486 | /* These are the two attributes of any PDC path. */ | |
c7428422 TV |
487 | static PATHS_ATTR(hwpath, 0644, pdcspath_hwpath_read, pdcspath_hwpath_write); |
488 | static PATHS_ATTR(layer, 0644, pdcspath_layer_read, pdcspath_layer_write); | |
1da177e4 LT |
489 | |
490 | static struct attribute *paths_subsys_attrs[] = { | |
491 | &paths_attr_hwpath.attr, | |
492 | &paths_attr_layer.attr, | |
493 | NULL, | |
494 | }; | |
495 | ||
496 | /* Specific kobject type for our PDC paths */ | |
497 | static struct kobj_type ktype_pdcspath = { | |
498 | .sysfs_ops = &pdcspath_attr_ops, | |
499 | .default_attrs = paths_subsys_attrs, | |
500 | }; | |
501 | ||
502 | /* We hard define the 4 types of path we expect to find */ | |
503 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
504 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
505 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
506 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
507 | ||
508 | /* An array containing all PDC paths we will deal with */ | |
509 | static struct pdcspath_entry *pdcspath_entries[] = { | |
510 | &pdcspath_entry_primary, | |
511 | &pdcspath_entry_alternative, | |
512 | &pdcspath_entry_console, | |
513 | &pdcspath_entry_keyboard, | |
514 | NULL, | |
515 | }; | |
516 | ||
c7428422 TV |
517 | |
518 | /* For more insight of what's going on here, refer to PDC Procedures doc, | |
519 | * Section PDC_STABLE */ | |
520 | ||
1da177e4 | 521 | /** |
c7428422 | 522 | * pdcs_size_read - Stable Storage size output. |
1da177e4 LT |
523 | * @entry: An allocated and populated subsytem struct. We don't use it tho. |
524 | * @buf: The output buffer to write to. | |
1da177e4 LT |
525 | */ |
526 | static ssize_t | |
c7428422 | 527 | pdcs_size_read(struct subsystem *entry, char *buf) |
1da177e4 LT |
528 | { |
529 | char *out = buf; | |
1da177e4 LT |
530 | |
531 | if (!entry || !buf) | |
532 | return -EINVAL; | |
533 | ||
534 | /* show the size of the stable storage */ | |
c7428422 | 535 | out += sprintf(out, "%ld\n", pdcs_size); |
1da177e4 | 536 | |
c7428422 TV |
537 | return out - buf; |
538 | } | |
539 | ||
540 | /** | |
541 | * pdcs_auto_read - Stable Storage autoboot/search flag output. | |
542 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
543 | * @buf: The output buffer to write to. | |
544 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag | |
545 | */ | |
546 | static ssize_t | |
547 | pdcs_auto_read(struct subsystem *entry, char *buf, int knob) | |
548 | { | |
549 | char *out = buf; | |
550 | struct pdcspath_entry *pathentry; | |
67a5a59d | 551 | |
c7428422 TV |
552 | if (!entry || !buf) |
553 | return -EINVAL; | |
554 | ||
555 | /* Current flags are stored in primary boot path entry */ | |
556 | pathentry = &pdcspath_entry_primary; | |
557 | ||
558 | read_lock(&pathentry->rw_lock); | |
559 | out += sprintf(out, "%s\n", (pathentry->devpath.flags & knob) ? | |
560 | "On" : "Off"); | |
561 | read_unlock(&pathentry->rw_lock); | |
562 | ||
563 | return out - buf; | |
564 | } | |
565 | ||
566 | /** | |
567 | * pdcs_autoboot_read - Stable Storage autoboot flag output. | |
568 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
569 | * @buf: The output buffer to write to. | |
570 | */ | |
571 | static inline ssize_t | |
572 | pdcs_autoboot_read(struct subsystem *entry, char *buf) | |
573 | { | |
574 | return pdcs_auto_read(entry, buf, PF_AUTOBOOT); | |
575 | } | |
576 | ||
577 | /** | |
578 | * pdcs_autosearch_read - Stable Storage autoboot flag output. | |
579 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
580 | * @buf: The output buffer to write to. | |
581 | */ | |
582 | static inline ssize_t | |
583 | pdcs_autosearch_read(struct subsystem *entry, char *buf) | |
584 | { | |
585 | return pdcs_auto_read(entry, buf, PF_AUTOSEARCH); | |
586 | } | |
587 | ||
588 | /** | |
589 | * pdcs_timer_read - Stable Storage timer count output (in seconds). | |
590 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
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 | */ | |
595 | static ssize_t | |
596 | pdcs_timer_read(struct subsystem *entry, char *buf) | |
597 | { | |
598 | char *out = buf; | |
599 | struct pdcspath_entry *pathentry; | |
600 | ||
601 | if (!entry || !buf) | |
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. | |
618 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
619 | * @buf: The output buffer to write to. | |
620 | */ | |
621 | static ssize_t | |
622 | pdcs_osid_read(struct subsystem *entry, char *buf) | |
623 | { | |
624 | char *out = buf; | |
c7428422 TV |
625 | |
626 | if (!entry || !buf) | |
627 | return -EINVAL; | |
1da177e4 | 628 | |
67a061a1 KM |
629 | out += sprintf(out, "%s dependent data (0x%.4x)\n", |
630 | os_id_to_string(pdcs_osid), pdcs_osid); | |
3f9edb53 TV |
631 | |
632 | return out - buf; | |
633 | } | |
634 | ||
635 | /** | |
636 | * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output. | |
637 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
638 | * @buf: The output buffer to write to. | |
639 | * | |
640 | * This can hold 16 bytes of OS-Dependent data. | |
641 | */ | |
642 | static ssize_t | |
643 | pdcs_osdep1_read(struct subsystem *entry, char *buf) | |
644 | { | |
645 | char *out = buf; | |
646 | u32 result[4]; | |
647 | ||
648 | if (!entry || !buf) | |
649 | return -EINVAL; | |
650 | ||
651 | if (pdc_stable_read(PDCS_ADDR_OSD1, &result, sizeof(result)) != PDC_OK) | |
652 | return -EIO; | |
653 | ||
654 | out += sprintf(out, "0x%.8x\n", result[0]); | |
655 | out += sprintf(out, "0x%.8x\n", result[1]); | |
656 | out += sprintf(out, "0x%.8x\n", result[2]); | |
657 | out += sprintf(out, "0x%.8x\n", result[3]); | |
658 | ||
659 | return out - buf; | |
660 | } | |
661 | ||
662 | /** | |
663 | * pdcs_diagnostic_read - Stable Storage Diagnostic register output. | |
664 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
665 | * @buf: The output buffer to write to. | |
666 | * | |
667 | * I have NFC how to interpret the content of that register ;-). | |
668 | */ | |
669 | static ssize_t | |
670 | pdcs_diagnostic_read(struct subsystem *entry, char *buf) | |
671 | { | |
672 | char *out = buf; | |
673 | u32 result; | |
674 | ||
675 | if (!entry || !buf) | |
676 | return -EINVAL; | |
677 | ||
678 | /* get diagnostic */ | |
679 | if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK) | |
680 | return -EIO; | |
681 | ||
682 | out += sprintf(out, "0x%.4x\n", (result >> 16)); | |
c7428422 TV |
683 | |
684 | return out - buf; | |
685 | } | |
686 | ||
687 | /** | |
688 | * pdcs_fastsize_read - Stable Storage FastSize register output. | |
689 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
690 | * @buf: The output buffer to write to. | |
691 | * | |
692 | * This register holds the amount of system RAM to be tested during boot sequence. | |
693 | */ | |
694 | static ssize_t | |
695 | pdcs_fastsize_read(struct subsystem *entry, char *buf) | |
696 | { | |
697 | char *out = buf; | |
3f9edb53 | 698 | u32 result; |
c7428422 TV |
699 | |
700 | if (!entry || !buf) | |
701 | return -EINVAL; | |
1da177e4 LT |
702 | |
703 | /* get fast-size */ | |
704 | if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) | |
705 | return -EIO; | |
706 | ||
1da177e4 | 707 | if ((result & 0x0F) < 0x0E) |
abff7543 | 708 | out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); |
1da177e4 LT |
709 | else |
710 | out += sprintf(out, "All"); | |
711 | out += sprintf(out, "\n"); | |
712 | ||
713 | return out - buf; | |
714 | } | |
715 | ||
3f9edb53 TV |
716 | /** |
717 | * pdcs_osdep2_read - Stable Storage OS-Dependent data area 2 output. | |
718 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
719 | * @buf: The output buffer to write to. | |
720 | * | |
721 | * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available. | |
722 | */ | |
723 | static ssize_t | |
724 | pdcs_osdep2_read(struct subsystem *entry, char *buf) | |
725 | { | |
726 | char *out = buf; | |
727 | unsigned long size; | |
728 | unsigned short i; | |
729 | u32 result; | |
730 | ||
731 | if (unlikely(pdcs_size <= 224)) | |
732 | return -ENODATA; | |
733 | ||
734 | size = pdcs_size - 224; | |
735 | ||
736 | if (!entry || !buf) | |
737 | return -EINVAL; | |
738 | ||
739 | for (i=0; i<size; i+=4) { | |
740 | if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result, | |
741 | sizeof(result)) != PDC_OK)) | |
742 | return -EIO; | |
743 | out += sprintf(out, "0x%.8x\n", result); | |
744 | } | |
745 | ||
746 | return out - buf; | |
747 | } | |
748 | ||
1da177e4 | 749 | /** |
c7428422 | 750 | * pdcs_auto_write - This function handles autoboot/search flag modifying. |
1da177e4 LT |
751 | * @entry: An allocated and populated subsytem struct. We don't use it tho. |
752 | * @buf: The input buffer to read from. | |
753 | * @count: The number of bytes to be read. | |
c7428422 | 754 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag |
1da177e4 | 755 | * |
c7428422 | 756 | * We will call this function to change the current autoboot flag. |
1da177e4 | 757 | * We expect a precise syntax: |
c7428422 | 758 | * \"n\" (n == 0 or 1) to toggle AutoBoot Off or On |
1da177e4 LT |
759 | */ |
760 | static ssize_t | |
c7428422 | 761 | pdcs_auto_write(struct subsystem *entry, const char *buf, size_t count, int knob) |
1da177e4 LT |
762 | { |
763 | struct pdcspath_entry *pathentry; | |
764 | unsigned char flags; | |
765 | char in[count+1], *temp; | |
766 | char c; | |
767 | ||
768 | if (!capable(CAP_SYS_ADMIN)) | |
769 | return -EACCES; | |
770 | ||
771 | if (!entry || !buf || !count) | |
772 | return -EINVAL; | |
773 | ||
774 | /* We'll use a local copy of buf */ | |
775 | memset(in, 0, count+1); | |
776 | strncpy(in, buf, count); | |
777 | ||
778 | /* Current flags are stored in primary boot path entry */ | |
779 | pathentry = &pdcspath_entry_primary; | |
780 | ||
781 | /* Be nice to the existing flag record */ | |
c7428422 | 782 | read_lock(&pathentry->rw_lock); |
1da177e4 | 783 | flags = pathentry->devpath.flags; |
c7428422 | 784 | read_unlock(&pathentry->rw_lock); |
1da177e4 LT |
785 | |
786 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
787 | ||
788 | temp = in; | |
789 | ||
790 | while (*temp && isspace(*temp)) | |
791 | temp++; | |
792 | ||
793 | c = *temp++ - '0'; | |
794 | if ((c != 0) && (c != 1)) | |
795 | goto parse_error; | |
796 | if (c == 0) | |
c7428422 | 797 | flags &= ~knob; |
1da177e4 | 798 | else |
c7428422 | 799 | flags |= knob; |
1da177e4 LT |
800 | |
801 | DPRINTK("%s: flags after: 0x%X\n", __func__, flags); | |
802 | ||
803 | /* So far so good, let's get in deep */ | |
c7428422 | 804 | write_lock(&pathentry->rw_lock); |
1da177e4 LT |
805 | |
806 | /* Change the path entry flags first */ | |
807 | pathentry->devpath.flags = flags; | |
808 | ||
809 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
810 | pdcspath_store(pathentry); |
811 | write_unlock(&pathentry->rw_lock); | |
1da177e4 | 812 | |
c7428422 TV |
813 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" to \"%s\"\n", |
814 | (knob & PF_AUTOBOOT) ? "autoboot" : "autosearch", | |
815 | (flags & knob) ? "On" : "Off"); | |
1da177e4 LT |
816 | |
817 | return count; | |
818 | ||
819 | parse_error: | |
c7428422 | 820 | printk(KERN_WARNING "%s: Parse error: expect \"n\" (n == 0 or 1)\n", __func__); |
1da177e4 LT |
821 | return -EINVAL; |
822 | } | |
823 | ||
c7428422 TV |
824 | /** |
825 | * pdcs_autoboot_write - This function handles autoboot flag modifying. | |
826 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
827 | * @buf: The input buffer to read from. | |
828 | * @count: The number of bytes to be read. | |
829 | * | |
830 | * We will call this function to change the current boot flags. | |
831 | * We expect a precise syntax: | |
832 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
833 | */ | |
834 | static inline ssize_t | |
835 | pdcs_autoboot_write(struct subsystem *entry, const char *buf, size_t count) | |
836 | { | |
837 | return pdcs_auto_write(entry, buf, count, PF_AUTOBOOT); | |
838 | } | |
839 | ||
840 | /** | |
841 | * pdcs_autosearch_write - This function handles autosearch flag modifying. | |
842 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
843 | * @buf: The input buffer to read from. | |
844 | * @count: The number of bytes to be read. | |
845 | * | |
846 | * We will call this function to change the current boot flags. | |
847 | * We expect a precise syntax: | |
848 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
849 | */ | |
850 | static inline ssize_t | |
851 | pdcs_autosearch_write(struct subsystem *entry, const char *buf, size_t count) | |
852 | { | |
853 | return pdcs_auto_write(entry, buf, count, PF_AUTOSEARCH); | |
854 | } | |
855 | ||
3f9edb53 TV |
856 | /** |
857 | * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input. | |
858 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
859 | * @buf: The input buffer to read from. | |
860 | * @count: The number of bytes to be read. | |
861 | * | |
862 | * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte | |
863 | * write approach. It's up to userspace to deal with it when constructing | |
864 | * its input buffer. | |
865 | */ | |
866 | static ssize_t | |
867 | pdcs_osdep1_write(struct subsystem *entry, const char *buf, size_t count) | |
868 | { | |
869 | u8 in[16]; | |
870 | ||
871 | if (!capable(CAP_SYS_ADMIN)) | |
872 | return -EACCES; | |
873 | ||
874 | if (!entry || !buf || !count) | |
875 | return -EINVAL; | |
876 | ||
ec1fdc24 | 877 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
878 | return -EPERM; |
879 | ||
880 | if (count > 16) | |
881 | return -EMSGSIZE; | |
882 | ||
883 | /* We'll use a local copy of buf */ | |
884 | memset(in, 0, 16); | |
885 | memcpy(in, buf, count); | |
886 | ||
887 | if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK) | |
888 | return -EIO; | |
889 | ||
890 | return count; | |
891 | } | |
892 | ||
893 | /** | |
894 | * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input. | |
895 | * @entry: An allocated and populated subsytem struct. We don't use it tho. | |
896 | * @buf: The input buffer to read from. | |
897 | * @count: The number of bytes to be read. | |
898 | * | |
899 | * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a | |
900 | * byte-by-byte write approach. It's up to userspace to deal with it when | |
901 | * constructing its input buffer. | |
902 | */ | |
903 | static ssize_t | |
904 | pdcs_osdep2_write(struct subsystem *entry, const char *buf, size_t count) | |
905 | { | |
906 | unsigned long size; | |
907 | unsigned short i; | |
908 | u8 in[4]; | |
909 | ||
910 | if (!capable(CAP_SYS_ADMIN)) | |
911 | return -EACCES; | |
912 | ||
913 | if (!entry || !buf || !count) | |
914 | return -EINVAL; | |
915 | ||
916 | if (unlikely(pdcs_size <= 224)) | |
917 | return -ENOSYS; | |
918 | ||
ec1fdc24 | 919 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
920 | return -EPERM; |
921 | ||
922 | size = pdcs_size - 224; | |
923 | ||
924 | if (count > size) | |
925 | return -EMSGSIZE; | |
926 | ||
927 | /* We'll use a local copy of buf */ | |
928 | ||
929 | for (i=0; i<count; i+=4) { | |
930 | memset(in, 0, 4); | |
931 | memcpy(in, buf+i, (count-i < 4) ? count-i : 4); | |
932 | if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in, | |
933 | sizeof(in)) != PDC_OK)) | |
934 | return -EIO; | |
935 | } | |
936 | ||
937 | return count; | |
938 | } | |
939 | ||
c7428422 TV |
940 | /* The remaining attributes. */ |
941 | static PDCS_ATTR(size, 0444, pdcs_size_read, NULL); | |
942 | static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write); | |
943 | static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write); | |
944 | static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL); | |
3f9edb53 TV |
945 | static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL); |
946 | static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write); | |
947 | static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL); | |
c7428422 | 948 | static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL); |
3f9edb53 | 949 | static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write); |
1da177e4 LT |
950 | |
951 | static struct subsys_attribute *pdcs_subsys_attrs[] = { | |
c7428422 TV |
952 | &pdcs_attr_size, |
953 | &pdcs_attr_autoboot, | |
954 | &pdcs_attr_autosearch, | |
955 | &pdcs_attr_timer, | |
956 | &pdcs_attr_osid, | |
3f9edb53 TV |
957 | &pdcs_attr_osdep1, |
958 | &pdcs_attr_diagnostic, | |
c7428422 | 959 | &pdcs_attr_fastsize, |
3f9edb53 | 960 | &pdcs_attr_osdep2, |
c7428422 | 961 | NULL, |
1da177e4 LT |
962 | }; |
963 | ||
964 | static decl_subsys(paths, &ktype_pdcspath, NULL); | |
c7428422 | 965 | static decl_subsys(stable, NULL, NULL); |
1da177e4 LT |
966 | |
967 | /** | |
968 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
969 | * | |
970 | * It creates kobjects corresponding to each path entry with nice sysfs | |
971 | * links to the real device. This is where the magic takes place: when | |
972 | * registering the subsystem attributes during module init, each kobject hereby | |
973 | * created will show in the sysfs tree as a folder containing files as defined | |
974 | * by path_subsys_attr[]. | |
975 | */ | |
976 | static inline int __init | |
977 | pdcs_register_pathentries(void) | |
978 | { | |
979 | unsigned short i; | |
980 | struct pdcspath_entry *entry; | |
4b991da7 | 981 | int err; |
1da177e4 | 982 | |
c7428422 TV |
983 | /* Initialize the entries rw_lock before anything else */ |
984 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
985 | rwlock_init(&entry->rw_lock); | |
986 | ||
1da177e4 | 987 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
c7428422 TV |
988 | write_lock(&entry->rw_lock); |
989 | err = pdcspath_fetch(entry); | |
990 | write_unlock(&entry->rw_lock); | |
991 | ||
992 | if (err < 0) | |
1da177e4 LT |
993 | continue; |
994 | ||
4b991da7 TV |
995 | if ((err = kobject_set_name(&entry->kobj, "%s", entry->name))) |
996 | return err; | |
1da177e4 | 997 | kobj_set_kset_s(entry, paths_subsys); |
4b991da7 TV |
998 | if ((err = kobject_register(&entry->kobj))) |
999 | return err; | |
1000 | ||
1001 | /* kobject is now registered */ | |
c7428422 | 1002 | write_lock(&entry->rw_lock); |
4b991da7 TV |
1003 | entry->ready = 2; |
1004 | ||
1da177e4 | 1005 | /* Add a nice symlink to the real device */ |
c7428422 TV |
1006 | if (entry->dev) |
1007 | sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
1008 | ||
1009 | write_unlock(&entry->rw_lock); | |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
1017 | */ | |
4b991da7 | 1018 | static inline void |
1da177e4 LT |
1019 | pdcs_unregister_pathentries(void) |
1020 | { | |
1021 | unsigned short i; | |
1022 | struct pdcspath_entry *entry; | |
1023 | ||
c7428422 TV |
1024 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
1025 | read_lock(&entry->rw_lock); | |
4b991da7 | 1026 | if (entry->ready >= 2) |
c7428422 TV |
1027 | kobject_unregister(&entry->kobj); |
1028 | read_unlock(&entry->rw_lock); | |
1029 | } | |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | /* | |
c7428422 TV |
1033 | * For now we register the stable subsystem with the firmware subsystem |
1034 | * and the paths subsystem with the stable subsystem | |
1da177e4 LT |
1035 | */ |
1036 | static int __init | |
1037 | pdc_stable_init(void) | |
1038 | { | |
1039 | struct subsys_attribute *attr; | |
1040 | int i, rc = 0, error = 0; | |
3f9edb53 | 1041 | u32 result; |
1da177e4 LT |
1042 | |
1043 | /* find the size of the stable storage */ | |
1044 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
1045 | return -ENODEV; | |
1046 | ||
c7428422 TV |
1047 | /* make sure we have enough data */ |
1048 | if (pdcs_size < 96) | |
1049 | return -ENODATA; | |
1050 | ||
1051 | printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION); | |
1da177e4 | 1052 | |
3f9edb53 TV |
1053 | /* get OSID */ |
1054 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
1055 | return -EIO; | |
1056 | ||
1057 | /* the actual result is 16 bits away */ | |
1058 | pdcs_osid = (u16)(result >> 16); | |
1059 | ||
c7428422 TV |
1060 | /* For now we'll register the stable subsys within this driver */ |
1061 | if ((rc = firmware_register(&stable_subsys))) | |
4b991da7 | 1062 | goto fail_firmreg; |
1da177e4 | 1063 | |
c7428422 | 1064 | /* Don't forget the root entries */ |
1da177e4 LT |
1065 | for (i = 0; (attr = pdcs_subsys_attrs[i]) && !error; i++) |
1066 | if (attr->show) | |
c7428422 | 1067 | error = subsys_create_file(&stable_subsys, attr); |
1da177e4 | 1068 | |
c7428422 TV |
1069 | /* register the paths subsys as a subsystem of stable subsys */ |
1070 | kset_set_kset_s(&paths_subsys, stable_subsys); | |
3f9edb53 | 1071 | if ((rc = subsystem_register(&paths_subsys))) |
4b991da7 | 1072 | goto fail_subsysreg; |
1da177e4 LT |
1073 | |
1074 | /* now we create all "files" for the paths subsys */ | |
4b991da7 TV |
1075 | if ((rc = pdcs_register_pathentries())) |
1076 | goto fail_pdcsreg; | |
1077 | ||
1078 | return rc; | |
1da177e4 | 1079 | |
4b991da7 TV |
1080 | fail_pdcsreg: |
1081 | pdcs_unregister_pathentries(); | |
1082 | subsystem_unregister(&paths_subsys); | |
1083 | ||
1084 | fail_subsysreg: | |
c7428422 | 1085 | firmware_unregister(&stable_subsys); |
4b991da7 TV |
1086 | |
1087 | fail_firmreg: | |
c7428422 | 1088 | printk(KERN_INFO PDCS_PREFIX " bailing out\n"); |
4b991da7 | 1089 | return rc; |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | static void __exit | |
1093 | pdc_stable_exit(void) | |
1094 | { | |
1095 | pdcs_unregister_pathentries(); | |
1096 | subsystem_unregister(&paths_subsys); | |
1097 | ||
c7428422 | 1098 | firmware_unregister(&stable_subsys); |
1da177e4 LT |
1099 | } |
1100 | ||
1101 | ||
1102 | module_init(pdc_stable_init); | |
1103 | module_exit(pdc_stable_exit); |