Commit | Line | Data |
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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Interfaces to retrieve and set PDC Stable options (firmware) | |
4 | * | |
c7428422 | 5 | * Copyright (C) 2005-2006 Thibaut VARENE <varenet@parisc-linux.org> |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * DEV NOTE: the PDC Procedures reference states that: |
8 | * "A minimum of 96 bytes of Stable Storage is required. Providing more than | |
9 | * 96 bytes of Stable Storage is optional [...]. Failure to provide the | |
10 | * optional locations from 96 to 192 results in the loss of certain | |
11 | * functionality during boot." | |
12 | * | |
13 | * Since locations between 96 and 192 are the various paths, most (if not | |
14 | * all) PA-RISC machines should have them. Anyway, for safety reasons, the | |
c7428422 | 15 | * following code can deal with just 96 bytes of Stable Storage, and all |
1da177e4 LT |
16 | * sizes between 96 and 192 bytes (provided they are multiple of struct |
17 | * device_path size, eg: 128, 160 and 192) to provide full information. | |
3f9edb53 TV |
18 | * One last word: there's one path we can always count on: the primary path. |
19 | * Anything above 224 bytes is used for 'osdep2' OS-dependent storage area. | |
20 | * | |
21 | * The first OS-dependent area should always be available. Obviously, this is | |
22 | * not true for the other one. Also bear in mind that reading/writing from/to | |
23 | * osdep2 is much more expensive than from/to osdep1. | |
24 | * NOTE: We do not handle the 2 bytes OS-dep area at 0x5D, nor the first | |
25 | * 2 bytes of storage available right after OSID. That's a total of 4 bytes | |
26 | * sacrificed: -ETOOLAZY :P | |
c7428422 TV |
27 | * |
28 | * The current policy wrt file permissions is: | |
29 | * - write: root only | |
30 | * - read: (reading triggers PDC calls) ? root only : everyone | |
31 | * The rationale is that PDC calls could hog (DoS) the machine. | |
32 | * | |
33 | * TODO: | |
34 | * - timer/fastsize write calls | |
1da177e4 LT |
35 | */ |
36 | ||
37 | #undef PDCS_DEBUG | |
38 | #ifdef PDCS_DEBUG | |
39 | #define DPRINTK(fmt, args...) printk(KERN_DEBUG fmt, ## args) | |
40 | #else | |
41 | #define DPRINTK(fmt, args...) | |
42 | #endif | |
43 | ||
44 | #include <linux/module.h> | |
45 | #include <linux/init.h> | |
1da177e4 LT |
46 | #include <linux/kernel.h> |
47 | #include <linux/string.h> | |
c59ede7b | 48 | #include <linux/capability.h> |
1da177e4 LT |
49 | #include <linux/ctype.h> |
50 | #include <linux/sysfs.h> | |
51 | #include <linux/kobject.h> | |
52 | #include <linux/device.h> | |
53 | #include <linux/errno.h> | |
c7428422 | 54 | #include <linux/spinlock.h> |
1da177e4 LT |
55 | |
56 | #include <asm/pdc.h> | |
57 | #include <asm/page.h> | |
7c0f6ba6 | 58 | #include <linux/uaccess.h> |
1da177e4 LT |
59 | #include <asm/hardware.h> |
60 | ||
3f9edb53 | 61 | #define PDCS_VERSION "0.30" |
c7428422 | 62 | #define PDCS_PREFIX "PDC Stable Storage" |
1da177e4 LT |
63 | |
64 | #define PDCS_ADDR_PPRI 0x00 | |
65 | #define PDCS_ADDR_OSID 0x40 | |
3f9edb53 TV |
66 | #define PDCS_ADDR_OSD1 0x48 |
67 | #define PDCS_ADDR_DIAG 0x58 | |
1da177e4 LT |
68 | #define PDCS_ADDR_FSIZ 0x5C |
69 | #define PDCS_ADDR_PCON 0x60 | |
70 | #define PDCS_ADDR_PALT 0x80 | |
71 | #define PDCS_ADDR_PKBD 0xA0 | |
3f9edb53 | 72 | #define PDCS_ADDR_OSD2 0xE0 |
1da177e4 LT |
73 | |
74 | MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>"); | |
75 | MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data"); | |
76 | MODULE_LICENSE("GPL"); | |
77 | MODULE_VERSION(PDCS_VERSION); | |
78 | ||
c7428422 | 79 | /* holds Stable Storage size. Initialized once and for all, no lock needed */ |
8039de10 | 80 | static unsigned long pdcs_size __read_mostly; |
1da177e4 | 81 | |
3f9edb53 TV |
82 | /* holds OS ID. Initialized once and for all, hopefully to 0x0006 */ |
83 | static u16 pdcs_osid __read_mostly; | |
84 | ||
1da177e4 LT |
85 | /* This struct defines what we need to deal with a parisc pdc path entry */ |
86 | struct pdcspath_entry { | |
c7428422 | 87 | rwlock_t rw_lock; /* to protect path entry access */ |
1da177e4 LT |
88 | short ready; /* entry record is valid if != 0 */ |
89 | unsigned long addr; /* entry address in stable storage */ | |
90 | char *name; /* entry name */ | |
91 | struct device_path devpath; /* device path in parisc representation */ | |
92 | struct device *dev; /* corresponding device */ | |
93 | struct kobject kobj; | |
94 | }; | |
95 | ||
96 | struct pdcspath_attribute { | |
97 | struct attribute attr; | |
98 | ssize_t (*show)(struct pdcspath_entry *entry, char *buf); | |
99 | ssize_t (*store)(struct pdcspath_entry *entry, const char *buf, size_t count); | |
100 | }; | |
101 | ||
102 | #define PDCSPATH_ENTRY(_addr, _name) \ | |
103 | struct pdcspath_entry pdcspath_entry_##_name = { \ | |
104 | .ready = 0, \ | |
105 | .addr = _addr, \ | |
106 | .name = __stringify(_name), \ | |
107 | }; | |
108 | ||
109 | #define PDCS_ATTR(_name, _mode, _show, _store) \ | |
7f548217 | 110 | struct kobj_attribute pdcs_attr_##_name = { \ |
7b595756 | 111 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
112 | .show = _show, \ |
113 | .store = _store, \ | |
114 | }; | |
115 | ||
116 | #define PATHS_ATTR(_name, _mode, _show, _store) \ | |
117 | struct pdcspath_attribute paths_attr_##_name = { \ | |
7b595756 | 118 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
119 | .show = _show, \ |
120 | .store = _store, \ | |
121 | }; | |
122 | ||
123 | #define to_pdcspath_attribute(_attr) container_of(_attr, struct pdcspath_attribute, attr) | |
124 | #define to_pdcspath_entry(obj) container_of(obj, struct pdcspath_entry, kobj) | |
125 | ||
126 | /** | |
127 | * pdcspath_fetch - This function populates the path entry structs. | |
128 | * @entry: A pointer to an allocated pdcspath_entry. | |
129 | * | |
130 | * The general idea is that you don't read from the Stable Storage every time | |
25985edc | 131 | * you access the files provided by the facilities. We store a copy of the |
1da177e4 LT |
132 | * content of the stable storage WRT various paths in these structs. We read |
133 | * these structs when reading the files, and we will write to these structs when | |
134 | * writing to the files, and only then write them back to the Stable Storage. | |
c7428422 TV |
135 | * |
136 | * This function expects to be called with @entry->rw_lock write-hold. | |
1da177e4 LT |
137 | */ |
138 | static int | |
139 | pdcspath_fetch(struct pdcspath_entry *entry) | |
140 | { | |
141 | struct device_path *devpath; | |
142 | ||
143 | if (!entry) | |
144 | return -EINVAL; | |
145 | ||
146 | devpath = &entry->devpath; | |
147 | ||
148 | DPRINTK("%s: fetch: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
149 | entry, devpath, entry->addr); | |
150 | ||
151 | /* addr, devpath and count must be word aligned */ | |
152 | if (pdc_stable_read(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) | |
153 | return -EIO; | |
154 | ||
155 | /* Find the matching device. | |
156 | NOTE: hardware_path overlays with device_path, so the nice cast can | |
157 | be used */ | |
158 | entry->dev = hwpath_to_device((struct hardware_path *)devpath); | |
159 | ||
160 | entry->ready = 1; | |
161 | ||
162 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | /** | |
168 | * pdcspath_store - This function writes a path to stable storage. | |
169 | * @entry: A pointer to an allocated pdcspath_entry. | |
170 | * | |
171 | * It can be used in two ways: either by passing it a preset devpath struct | |
172 | * containing an already computed hardware path, or by passing it a device | |
173 | * pointer, from which it'll find out the corresponding hardware path. | |
174 | * For now we do not handle the case where there's an error in writing to the | |
175 | * Stable Storage area, so you'd better not mess up the data :P | |
c7428422 TV |
176 | * |
177 | * This function expects to be called with @entry->rw_lock write-hold. | |
1da177e4 | 178 | */ |
c7428422 | 179 | static void |
1da177e4 LT |
180 | pdcspath_store(struct pdcspath_entry *entry) |
181 | { | |
182 | struct device_path *devpath; | |
183 | ||
c7428422 | 184 | BUG_ON(!entry); |
1da177e4 LT |
185 | |
186 | devpath = &entry->devpath; | |
187 | ||
188 | /* We expect the caller to set the ready flag to 0 if the hardware | |
189 | path struct provided is invalid, so that we know we have to fill it. | |
190 | First case, we don't have a preset hwpath... */ | |
191 | if (!entry->ready) { | |
192 | /* ...but we have a device, map it */ | |
c7428422 TV |
193 | BUG_ON(!entry->dev); |
194 | device_to_hwpath(entry->dev, (struct hardware_path *)devpath); | |
1da177e4 LT |
195 | } |
196 | /* else, we expect the provided hwpath to be valid. */ | |
197 | ||
198 | DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__, | |
199 | entry, devpath, entry->addr); | |
200 | ||
201 | /* addr, devpath and count must be word aligned */ | |
93c3e913 JL |
202 | if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) |
203 | WARN(1, KERN_ERR "%s: an error occurred when writing to PDC.\n" | |
1da177e4 LT |
204 | "It is likely that the Stable Storage data has been corrupted.\n" |
205 | "Please check it carefully upon next reboot.\n", __func__); | |
1da177e4 | 206 | |
4b991da7 TV |
207 | /* kobject is already registered */ |
208 | entry->ready = 2; | |
1da177e4 LT |
209 | |
210 | DPRINTK("%s: device: 0x%p\n", __func__, entry->dev); | |
1da177e4 LT |
211 | } |
212 | ||
213 | /** | |
214 | * pdcspath_hwpath_read - This function handles hardware path pretty printing. | |
215 | * @entry: An allocated and populated pdscpath_entry struct. | |
216 | * @buf: The output buffer to write to. | |
217 | * | |
218 | * We will call this function to format the output of the hwpath attribute file. | |
219 | */ | |
220 | static ssize_t | |
221 | pdcspath_hwpath_read(struct pdcspath_entry *entry, char *buf) | |
222 | { | |
223 | char *out = buf; | |
224 | struct device_path *devpath; | |
c7428422 | 225 | short i; |
1da177e4 LT |
226 | |
227 | if (!entry || !buf) | |
228 | return -EINVAL; | |
229 | ||
c7428422 | 230 | read_lock(&entry->rw_lock); |
1da177e4 | 231 | devpath = &entry->devpath; |
c7428422 TV |
232 | i = entry->ready; |
233 | read_unlock(&entry->rw_lock); | |
1da177e4 | 234 | |
c7428422 | 235 | if (!i) /* entry is not ready */ |
1da177e4 LT |
236 | return -ENODATA; |
237 | ||
238 | for (i = 0; i < 6; i++) { | |
239 | if (devpath->bc[i] >= 128) | |
240 | continue; | |
241 | out += sprintf(out, "%u/", (unsigned char)devpath->bc[i]); | |
242 | } | |
243 | out += sprintf(out, "%u\n", (unsigned char)devpath->mod); | |
244 | ||
245 | return out - buf; | |
246 | } | |
247 | ||
248 | /** | |
249 | * pdcspath_hwpath_write - This function handles hardware path modifying. | |
250 | * @entry: An allocated and populated pdscpath_entry struct. | |
251 | * @buf: The input buffer to read from. | |
252 | * @count: The number of bytes to be read. | |
253 | * | |
254 | * We will call this function to change the current hardware path. | |
255 | * Hardware paths are to be given '/'-delimited, without brackets. | |
c7428422 | 256 | * We make sure that the provided path actually maps to an existing |
1da177e4 LT |
257 | * device, BUT nothing would prevent some foolish user to set the path to some |
258 | * PCI bridge or even a CPU... | |
259 | * A better work around would be to make sure we are at the end of a device tree | |
260 | * for instance, but it would be IMHO beyond the simple scope of that driver. | |
261 | * The aim is to provide a facility. Data correctness is left to userland. | |
262 | */ | |
263 | static ssize_t | |
264 | pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
265 | { | |
266 | struct hardware_path hwpath; | |
267 | unsigned short i; | |
c735483d | 268 | char in[64], *temp; |
1da177e4 | 269 | struct device *dev; |
26f03249 | 270 | int ret; |
1da177e4 LT |
271 | |
272 | if (!entry || !buf || !count) | |
273 | return -EINVAL; | |
274 | ||
275 | /* We'll use a local copy of buf */ | |
c735483d | 276 | count = min_t(size_t, count, sizeof(in)-1); |
1da177e4 | 277 | strncpy(in, buf, count); |
c735483d | 278 | in[count] = '\0'; |
1da177e4 LT |
279 | |
280 | /* Let's clean up the target. 0xff is a blank pattern */ | |
281 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
282 | ||
283 | /* First, pick the mod field (the last one of the input string) */ | |
284 | if (!(temp = strrchr(in, '/'))) | |
285 | return -EINVAL; | |
286 | ||
287 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
288 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
289 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
290 | ||
291 | /* Then, loop for each delimiter, making sure we don't have too many. | |
292 | we write the bc fields in a down-top way. No matter what, we stop | |
293 | before writing the last field. If there are too many fields anyway, | |
294 | then the user is a moron and it'll be caught up later when we'll | |
295 | check the consistency of the given hwpath. */ | |
296 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
297 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
298 | in[temp-in] = '\0'; | |
299 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
300 | } | |
301 | ||
302 | /* Store the final field */ | |
303 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
304 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.bc[i]); | |
305 | ||
306 | /* Now we check that the user isn't trying to lure us */ | |
307 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
308 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
309 | "hardware path: %s\n", __func__, entry->name, buf); | |
310 | return -EINVAL; | |
311 | } | |
312 | ||
313 | /* So far so good, let's get in deep */ | |
c7428422 | 314 | write_lock(&entry->rw_lock); |
1da177e4 LT |
315 | entry->ready = 0; |
316 | entry->dev = dev; | |
317 | ||
318 | /* Now, dive in. Write back to the hardware */ | |
c7428422 | 319 | pdcspath_store(entry); |
1da177e4 LT |
320 | |
321 | /* Update the symlink to the real device */ | |
322 | sysfs_remove_link(&entry->kobj, "device"); | |
93964fd4 JB |
323 | write_unlock(&entry->rw_lock); |
324 | ||
26f03249 KM |
325 | ret = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); |
326 | WARN_ON(ret); | |
327 | ||
c7428422 | 328 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n", |
1da177e4 LT |
329 | entry->name, buf); |
330 | ||
331 | return count; | |
332 | } | |
333 | ||
334 | /** | |
335 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
336 | * @entry: An allocated and populated pdscpath_entry struct. | |
337 | * @buf: The output buffer to write to. | |
338 | * | |
339 | * We will call this function to format the output of the layer attribute file. | |
340 | */ | |
341 | static ssize_t | |
342 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
343 | { | |
344 | char *out = buf; | |
345 | struct device_path *devpath; | |
c7428422 | 346 | short i; |
1da177e4 LT |
347 | |
348 | if (!entry || !buf) | |
349 | return -EINVAL; | |
350 | ||
c7428422 | 351 | read_lock(&entry->rw_lock); |
1da177e4 | 352 | devpath = &entry->devpath; |
c7428422 TV |
353 | i = entry->ready; |
354 | read_unlock(&entry->rw_lock); | |
1da177e4 | 355 | |
c7428422 | 356 | if (!i) /* entry is not ready */ |
1da177e4 LT |
357 | return -ENODATA; |
358 | ||
447c233d | 359 | for (i = 0; i < 6 && devpath->layers[i]; i++) |
1da177e4 LT |
360 | out += sprintf(out, "%u ", devpath->layers[i]); |
361 | ||
362 | out += sprintf(out, "\n"); | |
363 | ||
364 | return out - buf; | |
365 | } | |
366 | ||
367 | /** | |
368 | * pdcspath_layer_write - This function handles extended layer modifying. | |
369 | * @entry: An allocated and populated pdscpath_entry struct. | |
370 | * @buf: The input buffer to read from. | |
371 | * @count: The number of bytes to be read. | |
372 | * | |
373 | * We will call this function to change the current layer value. | |
374 | * Layers are to be given '.'-delimited, without brackets. | |
375 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
376 | * Potential harm can be done, since there's no way to check the validity of | |
377 | * the layer fields. | |
378 | */ | |
379 | static ssize_t | |
380 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
381 | { | |
382 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
383 | unsigned short i; | |
c735483d | 384 | char in[64], *temp; |
1da177e4 LT |
385 | |
386 | if (!entry || !buf || !count) | |
387 | return -EINVAL; | |
388 | ||
389 | /* We'll use a local copy of buf */ | |
c735483d | 390 | count = min_t(size_t, count, sizeof(in)-1); |
1da177e4 | 391 | strncpy(in, buf, count); |
c735483d | 392 | in[count] = '\0'; |
1da177e4 LT |
393 | |
394 | /* Let's clean up the target. 0 is a blank pattern */ | |
395 | memset(&layers, 0, sizeof(layers)); | |
396 | ||
397 | /* First, pick the first layer */ | |
398 | if (unlikely(!isdigit(*in))) | |
399 | return -EINVAL; | |
400 | layers[0] = simple_strtoul(in, NULL, 10); | |
401 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
402 | ||
403 | temp = in; | |
404 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
405 | if (unlikely(!isdigit(*(++temp)))) | |
406 | return -EINVAL; | |
407 | layers[i] = simple_strtoul(temp, NULL, 10); | |
408 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
409 | } | |
410 | ||
411 | /* So far so good, let's get in deep */ | |
c7428422 | 412 | write_lock(&entry->rw_lock); |
1da177e4 LT |
413 | |
414 | /* First, overwrite the current layers with the new ones, not touching | |
415 | the hardware path. */ | |
416 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
417 | ||
418 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
419 | pdcspath_store(entry); |
420 | write_unlock(&entry->rw_lock); | |
1da177e4 | 421 | |
c7428422 | 422 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n", |
1da177e4 LT |
423 | entry->name, buf); |
424 | ||
425 | return count; | |
426 | } | |
427 | ||
428 | /** | |
429 | * pdcspath_attr_show - Generic read function call wrapper. | |
430 | * @kobj: The kobject to get info from. | |
431 | * @attr: The attribute looked upon. | |
432 | * @buf: The output buffer. | |
433 | */ | |
434 | static ssize_t | |
435 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
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 | ||
1da177e4 LT |
441 | if (pdcs_attr->show) |
442 | ret = pdcs_attr->show(entry, buf); | |
443 | ||
444 | return ret; | |
445 | } | |
446 | ||
447 | /** | |
448 | * pdcspath_attr_store - Generic write function call wrapper. | |
449 | * @kobj: The kobject to write info to. | |
450 | * @attr: The attribute to be modified. | |
451 | * @buf: The input buffer. | |
452 | * @count: The size of the buffer. | |
453 | */ | |
454 | static ssize_t | |
455 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
456 | const char *buf, size_t count) | |
457 | { | |
458 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
459 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
460 | ssize_t ret = 0; | |
461 | ||
462 | if (!capable(CAP_SYS_ADMIN)) | |
463 | return -EACCES; | |
464 | ||
465 | if (pdcs_attr->store) | |
466 | ret = pdcs_attr->store(entry, buf, count); | |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
52cf25d0 | 471 | static const struct sysfs_ops pdcspath_attr_ops = { |
1da177e4 LT |
472 | .show = pdcspath_attr_show, |
473 | .store = pdcspath_attr_store, | |
474 | }; | |
475 | ||
476 | /* These are the two attributes of any PDC path. */ | |
c7428422 TV |
477 | static PATHS_ATTR(hwpath, 0644, pdcspath_hwpath_read, pdcspath_hwpath_write); |
478 | static PATHS_ATTR(layer, 0644, pdcspath_layer_read, pdcspath_layer_write); | |
1da177e4 LT |
479 | |
480 | static struct attribute *paths_subsys_attrs[] = { | |
481 | &paths_attr_hwpath.attr, | |
482 | &paths_attr_layer.attr, | |
483 | NULL, | |
484 | }; | |
485 | ||
486 | /* Specific kobject type for our PDC paths */ | |
487 | static struct kobj_type ktype_pdcspath = { | |
488 | .sysfs_ops = &pdcspath_attr_ops, | |
489 | .default_attrs = paths_subsys_attrs, | |
490 | }; | |
491 | ||
492 | /* We hard define the 4 types of path we expect to find */ | |
493 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
494 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
495 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
496 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
497 | ||
498 | /* An array containing all PDC paths we will deal with */ | |
499 | static struct pdcspath_entry *pdcspath_entries[] = { | |
500 | &pdcspath_entry_primary, | |
501 | &pdcspath_entry_alternative, | |
502 | &pdcspath_entry_console, | |
503 | &pdcspath_entry_keyboard, | |
504 | NULL, | |
505 | }; | |
506 | ||
c7428422 TV |
507 | |
508 | /* For more insight of what's going on here, refer to PDC Procedures doc, | |
509 | * Section PDC_STABLE */ | |
510 | ||
1da177e4 | 511 | /** |
c7428422 | 512 | * pdcs_size_read - Stable Storage size output. |
1da177e4 | 513 | * @buf: The output buffer to write to. |
1da177e4 | 514 | */ |
7f548217 GKH |
515 | static ssize_t pdcs_size_read(struct kobject *kobj, |
516 | struct kobj_attribute *attr, | |
517 | char *buf) | |
1da177e4 LT |
518 | { |
519 | char *out = buf; | |
823bccfc | 520 | |
7f548217 | 521 | if (!buf) |
1da177e4 | 522 | return -EINVAL; |
823bccfc | 523 | |
1da177e4 | 524 | /* show the size of the stable storage */ |
c7428422 | 525 | out += sprintf(out, "%ld\n", pdcs_size); |
1da177e4 | 526 | |
c7428422 TV |
527 | return out - buf; |
528 | } | |
529 | ||
530 | /** | |
531 | * pdcs_auto_read - Stable Storage autoboot/search flag output. | |
c7428422 TV |
532 | * @buf: The output buffer to write to. |
533 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag | |
534 | */ | |
7f548217 GKH |
535 | static ssize_t pdcs_auto_read(struct kobject *kobj, |
536 | struct kobj_attribute *attr, | |
537 | char *buf, int knob) | |
c7428422 TV |
538 | { |
539 | char *out = buf; | |
540 | struct pdcspath_entry *pathentry; | |
67a5a59d | 541 | |
7f548217 | 542 | if (!buf) |
c7428422 TV |
543 | return -EINVAL; |
544 | ||
545 | /* Current flags are stored in primary boot path entry */ | |
546 | pathentry = &pdcspath_entry_primary; | |
547 | ||
548 | read_lock(&pathentry->rw_lock); | |
549 | out += sprintf(out, "%s\n", (pathentry->devpath.flags & knob) ? | |
550 | "On" : "Off"); | |
551 | read_unlock(&pathentry->rw_lock); | |
552 | ||
553 | return out - buf; | |
554 | } | |
555 | ||
556 | /** | |
557 | * pdcs_autoboot_read - Stable Storage autoboot flag output. | |
c7428422 TV |
558 | * @buf: The output buffer to write to. |
559 | */ | |
7f548217 GKH |
560 | static ssize_t pdcs_autoboot_read(struct kobject *kobj, |
561 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 562 | { |
7f548217 | 563 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOBOOT); |
c7428422 TV |
564 | } |
565 | ||
566 | /** | |
567 | * pdcs_autosearch_read - Stable Storage autoboot flag output. | |
c7428422 TV |
568 | * @buf: The output buffer to write to. |
569 | */ | |
7f548217 GKH |
570 | static ssize_t pdcs_autosearch_read(struct kobject *kobj, |
571 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 572 | { |
7f548217 | 573 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOSEARCH); |
c7428422 TV |
574 | } |
575 | ||
576 | /** | |
577 | * pdcs_timer_read - Stable Storage timer count output (in seconds). | |
c7428422 TV |
578 | * @buf: The output buffer to write to. |
579 | * | |
580 | * The value of the timer field correponds to a number of seconds in powers of 2. | |
581 | */ | |
7f548217 GKH |
582 | static ssize_t pdcs_timer_read(struct kobject *kobj, |
583 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
584 | { |
585 | char *out = buf; | |
586 | struct pdcspath_entry *pathentry; | |
587 | ||
7f548217 | 588 | if (!buf) |
c7428422 TV |
589 | return -EINVAL; |
590 | ||
591 | /* Current flags are stored in primary boot path entry */ | |
592 | pathentry = &pdcspath_entry_primary; | |
593 | ||
594 | /* print the timer value in seconds */ | |
595 | read_lock(&pathentry->rw_lock); | |
596 | out += sprintf(out, "%u\n", (pathentry->devpath.flags & PF_TIMER) ? | |
597 | (1 << (pathentry->devpath.flags & PF_TIMER)) : 0); | |
598 | read_unlock(&pathentry->rw_lock); | |
599 | ||
600 | return out - buf; | |
601 | } | |
602 | ||
603 | /** | |
604 | * pdcs_osid_read - Stable Storage OS ID register output. | |
c7428422 TV |
605 | * @buf: The output buffer to write to. |
606 | */ | |
7f548217 GKH |
607 | static ssize_t pdcs_osid_read(struct kobject *kobj, |
608 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
609 | { |
610 | char *out = buf; | |
c7428422 | 611 | |
7f548217 | 612 | if (!buf) |
c7428422 | 613 | return -EINVAL; |
1da177e4 | 614 | |
67a061a1 KM |
615 | out += sprintf(out, "%s dependent data (0x%.4x)\n", |
616 | os_id_to_string(pdcs_osid), pdcs_osid); | |
3f9edb53 TV |
617 | |
618 | return out - buf; | |
619 | } | |
620 | ||
621 | /** | |
622 | * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output. | |
3f9edb53 TV |
623 | * @buf: The output buffer to write to. |
624 | * | |
625 | * This can hold 16 bytes of OS-Dependent data. | |
626 | */ | |
7f548217 GKH |
627 | static ssize_t pdcs_osdep1_read(struct kobject *kobj, |
628 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
629 | { |
630 | char *out = buf; | |
631 | u32 result[4]; | |
632 | ||
7f548217 | 633 | if (!buf) |
3f9edb53 TV |
634 | return -EINVAL; |
635 | ||
636 | if (pdc_stable_read(PDCS_ADDR_OSD1, &result, sizeof(result)) != PDC_OK) | |
637 | return -EIO; | |
638 | ||
639 | out += sprintf(out, "0x%.8x\n", result[0]); | |
640 | out += sprintf(out, "0x%.8x\n", result[1]); | |
641 | out += sprintf(out, "0x%.8x\n", result[2]); | |
642 | out += sprintf(out, "0x%.8x\n", result[3]); | |
643 | ||
644 | return out - buf; | |
645 | } | |
646 | ||
647 | /** | |
648 | * pdcs_diagnostic_read - Stable Storage Diagnostic register output. | |
3f9edb53 TV |
649 | * @buf: The output buffer to write to. |
650 | * | |
651 | * I have NFC how to interpret the content of that register ;-). | |
652 | */ | |
7f548217 GKH |
653 | static ssize_t pdcs_diagnostic_read(struct kobject *kobj, |
654 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
655 | { |
656 | char *out = buf; | |
657 | u32 result; | |
658 | ||
7f548217 | 659 | if (!buf) |
3f9edb53 TV |
660 | return -EINVAL; |
661 | ||
662 | /* get diagnostic */ | |
663 | if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK) | |
664 | return -EIO; | |
665 | ||
666 | out += sprintf(out, "0x%.4x\n", (result >> 16)); | |
c7428422 TV |
667 | |
668 | return out - buf; | |
669 | } | |
670 | ||
671 | /** | |
672 | * pdcs_fastsize_read - Stable Storage FastSize register output. | |
c7428422 TV |
673 | * @buf: The output buffer to write to. |
674 | * | |
675 | * This register holds the amount of system RAM to be tested during boot sequence. | |
676 | */ | |
7f548217 GKH |
677 | static ssize_t pdcs_fastsize_read(struct kobject *kobj, |
678 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
679 | { |
680 | char *out = buf; | |
3f9edb53 | 681 | u32 result; |
c7428422 | 682 | |
7f548217 | 683 | if (!buf) |
c7428422 | 684 | return -EINVAL; |
1da177e4 LT |
685 | |
686 | /* get fast-size */ | |
687 | if (pdc_stable_read(PDCS_ADDR_FSIZ, &result, sizeof(result)) != PDC_OK) | |
688 | return -EIO; | |
689 | ||
1da177e4 | 690 | if ((result & 0x0F) < 0x0E) |
abff7543 | 691 | out += sprintf(out, "%d kB", (1<<(result & 0x0F))*256); |
1da177e4 LT |
692 | else |
693 | out += sprintf(out, "All"); | |
694 | out += sprintf(out, "\n"); | |
695 | ||
696 | return out - buf; | |
697 | } | |
698 | ||
3f9edb53 TV |
699 | /** |
700 | * pdcs_osdep2_read - Stable Storage OS-Dependent data area 2 output. | |
3f9edb53 TV |
701 | * @buf: The output buffer to write to. |
702 | * | |
703 | * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available. | |
704 | */ | |
7f548217 GKH |
705 | static ssize_t pdcs_osdep2_read(struct kobject *kobj, |
706 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
707 | { |
708 | char *out = buf; | |
709 | unsigned long size; | |
710 | unsigned short i; | |
711 | u32 result; | |
712 | ||
713 | if (unlikely(pdcs_size <= 224)) | |
714 | return -ENODATA; | |
715 | ||
716 | size = pdcs_size - 224; | |
717 | ||
7f548217 | 718 | if (!buf) |
3f9edb53 TV |
719 | return -EINVAL; |
720 | ||
721 | for (i=0; i<size; i+=4) { | |
722 | if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result, | |
723 | sizeof(result)) != PDC_OK)) | |
724 | return -EIO; | |
725 | out += sprintf(out, "0x%.8x\n", result); | |
726 | } | |
727 | ||
728 | return out - buf; | |
729 | } | |
730 | ||
1da177e4 | 731 | /** |
c7428422 | 732 | * pdcs_auto_write - This function handles autoboot/search flag modifying. |
1da177e4 LT |
733 | * @buf: The input buffer to read from. |
734 | * @count: The number of bytes to be read. | |
c7428422 | 735 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag |
1da177e4 | 736 | * |
c7428422 | 737 | * We will call this function to change the current autoboot flag. |
1da177e4 | 738 | * We expect a precise syntax: |
c7428422 | 739 | * \"n\" (n == 0 or 1) to toggle AutoBoot Off or On |
1da177e4 | 740 | */ |
7f548217 GKH |
741 | static ssize_t pdcs_auto_write(struct kobject *kobj, |
742 | struct kobj_attribute *attr, const char *buf, | |
743 | size_t count, int knob) | |
1da177e4 LT |
744 | { |
745 | struct pdcspath_entry *pathentry; | |
746 | unsigned char flags; | |
94c457de | 747 | char in[8], *temp; |
1da177e4 LT |
748 | char c; |
749 | ||
750 | if (!capable(CAP_SYS_ADMIN)) | |
751 | return -EACCES; | |
752 | ||
7f548217 | 753 | if (!buf || !count) |
1da177e4 LT |
754 | return -EINVAL; |
755 | ||
756 | /* We'll use a local copy of buf */ | |
c735483d | 757 | count = min_t(size_t, count, sizeof(in)-1); |
1da177e4 | 758 | strncpy(in, buf, count); |
94c457de | 759 | in[count] = '\0'; |
1da177e4 LT |
760 | |
761 | /* Current flags are stored in primary boot path entry */ | |
762 | pathentry = &pdcspath_entry_primary; | |
763 | ||
764 | /* Be nice to the existing flag record */ | |
c7428422 | 765 | read_lock(&pathentry->rw_lock); |
1da177e4 | 766 | flags = pathentry->devpath.flags; |
c7428422 | 767 | read_unlock(&pathentry->rw_lock); |
1da177e4 LT |
768 | |
769 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
e7d2860b AGR |
770 | |
771 | temp = skip_spaces(in); | |
772 | ||
1da177e4 LT |
773 | c = *temp++ - '0'; |
774 | if ((c != 0) && (c != 1)) | |
775 | goto parse_error; | |
776 | if (c == 0) | |
c7428422 | 777 | flags &= ~knob; |
1da177e4 | 778 | else |
c7428422 | 779 | flags |= knob; |
1da177e4 LT |
780 | |
781 | DPRINTK("%s: flags after: 0x%X\n", __func__, flags); | |
782 | ||
783 | /* So far so good, let's get in deep */ | |
c7428422 | 784 | write_lock(&pathentry->rw_lock); |
1da177e4 LT |
785 | |
786 | /* Change the path entry flags first */ | |
787 | pathentry->devpath.flags = flags; | |
788 | ||
789 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
790 | pdcspath_store(pathentry); |
791 | write_unlock(&pathentry->rw_lock); | |
1da177e4 | 792 | |
c7428422 TV |
793 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" to \"%s\"\n", |
794 | (knob & PF_AUTOBOOT) ? "autoboot" : "autosearch", | |
795 | (flags & knob) ? "On" : "Off"); | |
1da177e4 LT |
796 | |
797 | return count; | |
798 | ||
799 | parse_error: | |
c7428422 | 800 | printk(KERN_WARNING "%s: Parse error: expect \"n\" (n == 0 or 1)\n", __func__); |
1da177e4 LT |
801 | return -EINVAL; |
802 | } | |
803 | ||
c7428422 TV |
804 | /** |
805 | * pdcs_autoboot_write - This function handles autoboot flag modifying. | |
c7428422 TV |
806 | * @buf: The input buffer to read from. |
807 | * @count: The number of bytes to be read. | |
808 | * | |
809 | * We will call this function to change the current boot flags. | |
810 | * We expect a precise syntax: | |
811 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
812 | */ | |
7f548217 GKH |
813 | static ssize_t pdcs_autoboot_write(struct kobject *kobj, |
814 | struct kobj_attribute *attr, | |
815 | const char *buf, size_t count) | |
c7428422 | 816 | { |
ff451d70 | 817 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOBOOT); |
c7428422 TV |
818 | } |
819 | ||
820 | /** | |
821 | * pdcs_autosearch_write - This function handles autosearch flag modifying. | |
c7428422 TV |
822 | * @buf: The input buffer to read from. |
823 | * @count: The number of bytes to be read. | |
824 | * | |
825 | * We will call this function to change the current boot flags. | |
826 | * We expect a precise syntax: | |
827 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
828 | */ | |
7f548217 GKH |
829 | static ssize_t pdcs_autosearch_write(struct kobject *kobj, |
830 | struct kobj_attribute *attr, | |
831 | const char *buf, size_t count) | |
c7428422 | 832 | { |
ff451d70 | 833 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOSEARCH); |
c7428422 TV |
834 | } |
835 | ||
3f9edb53 TV |
836 | /** |
837 | * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input. | |
3f9edb53 TV |
838 | * @buf: The input buffer to read from. |
839 | * @count: The number of bytes to be read. | |
840 | * | |
841 | * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte | |
842 | * write approach. It's up to userspace to deal with it when constructing | |
843 | * its input buffer. | |
844 | */ | |
7f548217 GKH |
845 | static ssize_t pdcs_osdep1_write(struct kobject *kobj, |
846 | struct kobj_attribute *attr, | |
847 | const char *buf, size_t count) | |
3f9edb53 TV |
848 | { |
849 | u8 in[16]; | |
850 | ||
851 | if (!capable(CAP_SYS_ADMIN)) | |
852 | return -EACCES; | |
853 | ||
7f548217 | 854 | if (!buf || !count) |
3f9edb53 TV |
855 | return -EINVAL; |
856 | ||
ec1fdc24 | 857 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
858 | return -EPERM; |
859 | ||
860 | if (count > 16) | |
861 | return -EMSGSIZE; | |
862 | ||
863 | /* We'll use a local copy of buf */ | |
864 | memset(in, 0, 16); | |
865 | memcpy(in, buf, count); | |
866 | ||
867 | if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK) | |
868 | return -EIO; | |
869 | ||
870 | return count; | |
871 | } | |
872 | ||
873 | /** | |
874 | * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input. | |
3f9edb53 TV |
875 | * @buf: The input buffer to read from. |
876 | * @count: The number of bytes to be read. | |
877 | * | |
878 | * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a | |
879 | * byte-by-byte write approach. It's up to userspace to deal with it when | |
880 | * constructing its input buffer. | |
881 | */ | |
7f548217 GKH |
882 | static ssize_t pdcs_osdep2_write(struct kobject *kobj, |
883 | struct kobj_attribute *attr, | |
884 | const char *buf, size_t count) | |
3f9edb53 TV |
885 | { |
886 | unsigned long size; | |
887 | unsigned short i; | |
888 | u8 in[4]; | |
889 | ||
890 | if (!capable(CAP_SYS_ADMIN)) | |
891 | return -EACCES; | |
892 | ||
7f548217 | 893 | if (!buf || !count) |
3f9edb53 TV |
894 | return -EINVAL; |
895 | ||
896 | if (unlikely(pdcs_size <= 224)) | |
897 | return -ENOSYS; | |
898 | ||
ec1fdc24 | 899 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
900 | return -EPERM; |
901 | ||
902 | size = pdcs_size - 224; | |
903 | ||
904 | if (count > size) | |
905 | return -EMSGSIZE; | |
906 | ||
907 | /* We'll use a local copy of buf */ | |
908 | ||
909 | for (i=0; i<count; i+=4) { | |
910 | memset(in, 0, 4); | |
911 | memcpy(in, buf+i, (count-i < 4) ? count-i : 4); | |
912 | if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in, | |
913 | sizeof(in)) != PDC_OK)) | |
914 | return -EIO; | |
915 | } | |
916 | ||
917 | return count; | |
918 | } | |
919 | ||
c7428422 TV |
920 | /* The remaining attributes. */ |
921 | static PDCS_ATTR(size, 0444, pdcs_size_read, NULL); | |
922 | static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write); | |
923 | static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write); | |
924 | static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL); | |
3f9edb53 TV |
925 | static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL); |
926 | static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write); | |
927 | static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL); | |
c7428422 | 928 | static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL); |
3f9edb53 | 929 | static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write); |
1da177e4 | 930 | |
7f548217 GKH |
931 | static struct attribute *pdcs_subsys_attrs[] = { |
932 | &pdcs_attr_size.attr, | |
933 | &pdcs_attr_autoboot.attr, | |
934 | &pdcs_attr_autosearch.attr, | |
935 | &pdcs_attr_timer.attr, | |
936 | &pdcs_attr_osid.attr, | |
937 | &pdcs_attr_osdep1.attr, | |
938 | &pdcs_attr_diagnostic.attr, | |
939 | &pdcs_attr_fastsize.attr, | |
940 | &pdcs_attr_osdep2.attr, | |
c7428422 | 941 | NULL, |
1da177e4 LT |
942 | }; |
943 | ||
343fdfb7 | 944 | static const struct attribute_group pdcs_attr_group = { |
7f548217 GKH |
945 | .attrs = pdcs_subsys_attrs, |
946 | }; | |
947 | ||
c829a5b4 | 948 | static struct kobject *stable_kobj; |
4443d07f | 949 | static struct kset *paths_kset; |
1da177e4 LT |
950 | |
951 | /** | |
952 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
953 | * | |
954 | * It creates kobjects corresponding to each path entry with nice sysfs | |
955 | * links to the real device. This is where the magic takes place: when | |
956 | * registering the subsystem attributes during module init, each kobject hereby | |
957 | * created will show in the sysfs tree as a folder containing files as defined | |
958 | * by path_subsys_attr[]. | |
959 | */ | |
960 | static inline int __init | |
961 | pdcs_register_pathentries(void) | |
962 | { | |
963 | unsigned short i; | |
964 | struct pdcspath_entry *entry; | |
4b991da7 | 965 | int err; |
1da177e4 | 966 | |
c7428422 TV |
967 | /* Initialize the entries rw_lock before anything else */ |
968 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
969 | rwlock_init(&entry->rw_lock); | |
970 | ||
1da177e4 | 971 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
c7428422 TV |
972 | write_lock(&entry->rw_lock); |
973 | err = pdcspath_fetch(entry); | |
974 | write_unlock(&entry->rw_lock); | |
975 | ||
976 | if (err < 0) | |
1da177e4 LT |
977 | continue; |
978 | ||
4443d07f | 979 | entry->kobj.kset = paths_kset; |
73f368cf GKH |
980 | err = kobject_init_and_add(&entry->kobj, &ktype_pdcspath, NULL, |
981 | "%s", entry->name); | |
982 | if (err) | |
4b991da7 | 983 | return err; |
73f368cf | 984 | |
4b991da7 | 985 | /* kobject is now registered */ |
c7428422 | 986 | write_lock(&entry->rw_lock); |
4b991da7 | 987 | entry->ready = 2; |
93964fd4 | 988 | write_unlock(&entry->rw_lock); |
4b991da7 | 989 | |
1da177e4 | 990 | /* Add a nice symlink to the real device */ |
26f03249 KM |
991 | if (entry->dev) { |
992 | err = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
993 | WARN_ON(err); | |
994 | } | |
c7428422 | 995 | |
73f368cf | 996 | kobject_uevent(&entry->kobj, KOBJ_ADD); |
1da177e4 LT |
997 | } |
998 | ||
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
1004 | */ | |
4b991da7 | 1005 | static inline void |
1da177e4 LT |
1006 | pdcs_unregister_pathentries(void) |
1007 | { | |
1008 | unsigned short i; | |
1009 | struct pdcspath_entry *entry; | |
1010 | ||
c7428422 TV |
1011 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
1012 | read_lock(&entry->rw_lock); | |
4b991da7 | 1013 | if (entry->ready >= 2) |
c10997f6 | 1014 | kobject_put(&entry->kobj); |
c7428422 TV |
1015 | read_unlock(&entry->rw_lock); |
1016 | } | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /* | |
c7428422 TV |
1020 | * For now we register the stable subsystem with the firmware subsystem |
1021 | * and the paths subsystem with the stable subsystem | |
1da177e4 LT |
1022 | */ |
1023 | static int __init | |
1024 | pdc_stable_init(void) | |
1025 | { | |
7f548217 | 1026 | int rc = 0, error = 0; |
3f9edb53 | 1027 | u32 result; |
1da177e4 LT |
1028 | |
1029 | /* find the size of the stable storage */ | |
1030 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
1031 | return -ENODEV; | |
1032 | ||
c7428422 TV |
1033 | /* make sure we have enough data */ |
1034 | if (pdcs_size < 96) | |
1035 | return -ENODATA; | |
1036 | ||
1037 | printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION); | |
1da177e4 | 1038 | |
3f9edb53 TV |
1039 | /* get OSID */ |
1040 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
1041 | return -EIO; | |
1042 | ||
1043 | /* the actual result is 16 bits away */ | |
1044 | pdcs_osid = (u16)(result >> 16); | |
1045 | ||
c829a5b4 GKH |
1046 | /* For now we'll register the directory at /sys/firmware/stable */ |
1047 | stable_kobj = kobject_create_and_add("stable", firmware_kobj); | |
1048 | if (!stable_kobj) { | |
4443d07f | 1049 | rc = -ENOMEM; |
4b991da7 | 1050 | goto fail_firmreg; |
4443d07f | 1051 | } |
1da177e4 | 1052 | |
c7428422 | 1053 | /* Don't forget the root entries */ |
ff451d70 | 1054 | error = sysfs_create_group(stable_kobj, &pdcs_attr_group); |
7f548217 | 1055 | |
4443d07f | 1056 | /* register the paths kset as a child of the stable kset */ |
c829a5b4 | 1057 | paths_kset = kset_create_and_add("paths", NULL, stable_kobj); |
4443d07f GKH |
1058 | if (!paths_kset) { |
1059 | rc = -ENOMEM; | |
1060 | goto fail_ksetreg; | |
1061 | } | |
1da177e4 | 1062 | |
4443d07f | 1063 | /* now we create all "files" for the paths kset */ |
4b991da7 TV |
1064 | if ((rc = pdcs_register_pathentries())) |
1065 | goto fail_pdcsreg; | |
1066 | ||
1067 | return rc; | |
1da177e4 | 1068 | |
4b991da7 TV |
1069 | fail_pdcsreg: |
1070 | pdcs_unregister_pathentries(); | |
4443d07f | 1071 | kset_unregister(paths_kset); |
4b991da7 | 1072 | |
4443d07f | 1073 | fail_ksetreg: |
c10997f6 | 1074 | kobject_put(stable_kobj); |
4b991da7 TV |
1075 | |
1076 | fail_firmreg: | |
c7428422 | 1077 | printk(KERN_INFO PDCS_PREFIX " bailing out\n"); |
4b991da7 | 1078 | return rc; |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | static void __exit | |
1082 | pdc_stable_exit(void) | |
1083 | { | |
1084 | pdcs_unregister_pathentries(); | |
4443d07f | 1085 | kset_unregister(paths_kset); |
c10997f6 | 1086 | kobject_put(stable_kobj); |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | ||
1090 | module_init(pdc_stable_init); | |
1091 | module_exit(pdc_stable_exit); |