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 | 16 | * sizes between 96 and 192 bytes (provided they are multiple of struct |
50f19697 | 17 | * pdc_module_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 */ | |
50f19697 | 91 | struct pdc_module_path devpath; /* device path in parisc representation */ |
1da177e4 LT |
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 | { | |
50f19697 | 141 | struct pdc_module_path *devpath; |
1da177e4 LT |
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. | |
50f19697 | 156 | NOTE: hardware_path overlays with pdc_module_path, so the nice cast can |
1da177e4 LT |
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 | { | |
50f19697 | 182 | struct pdc_module_path *devpath; |
1da177e4 | 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; | |
50f19697 | 224 | struct pdc_module_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++) { | |
50f19697 | 239 | if (devpath->path.bc[i] < 0) |
1da177e4 | 240 | continue; |
50f19697 | 241 | out += sprintf(out, "%d/", devpath->path.bc[i]); |
1da177e4 | 242 | } |
50f19697 | 243 | out += sprintf(out, "%u\n", (unsigned char)devpath->path.mod); |
1da177e4 LT |
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); |
f2193bb2 | 277 | strscpy(in, buf, count + 1); |
1da177e4 LT |
278 | |
279 | /* Let's clean up the target. 0xff is a blank pattern */ | |
280 | memset(&hwpath, 0xff, sizeof(hwpath)); | |
281 | ||
282 | /* First, pick the mod field (the last one of the input string) */ | |
283 | if (!(temp = strrchr(in, '/'))) | |
284 | return -EINVAL; | |
285 | ||
286 | hwpath.mod = simple_strtoul(temp+1, NULL, 10); | |
287 | in[temp-in] = '\0'; /* truncate the remaining string. just precaution */ | |
288 | DPRINTK("%s: mod: %d\n", __func__, hwpath.mod); | |
289 | ||
290 | /* Then, loop for each delimiter, making sure we don't have too many. | |
291 | we write the bc fields in a down-top way. No matter what, we stop | |
292 | before writing the last field. If there are too many fields anyway, | |
293 | then the user is a moron and it'll be caught up later when we'll | |
294 | check the consistency of the given hwpath. */ | |
295 | for (i=5; ((temp = strrchr(in, '/'))) && (temp-in > 0) && (likely(i)); i--) { | |
296 | hwpath.bc[i] = simple_strtoul(temp+1, NULL, 10); | |
297 | in[temp-in] = '\0'; | |
50f19697 | 298 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.path.bc[i]); |
1da177e4 LT |
299 | } |
300 | ||
301 | /* Store the final field */ | |
302 | hwpath.bc[i] = simple_strtoul(in, NULL, 10); | |
50f19697 | 303 | DPRINTK("%s: bc[%d]: %d\n", __func__, i, hwpath.path.bc[i]); |
1da177e4 LT |
304 | |
305 | /* Now we check that the user isn't trying to lure us */ | |
306 | if (!(dev = hwpath_to_device((struct hardware_path *)&hwpath))) { | |
307 | printk(KERN_WARNING "%s: attempt to set invalid \"%s\" " | |
308 | "hardware path: %s\n", __func__, entry->name, buf); | |
309 | return -EINVAL; | |
310 | } | |
311 | ||
312 | /* So far so good, let's get in deep */ | |
c7428422 | 313 | write_lock(&entry->rw_lock); |
1da177e4 LT |
314 | entry->ready = 0; |
315 | entry->dev = dev; | |
316 | ||
317 | /* Now, dive in. Write back to the hardware */ | |
c7428422 | 318 | pdcspath_store(entry); |
1da177e4 LT |
319 | |
320 | /* Update the symlink to the real device */ | |
321 | sysfs_remove_link(&entry->kobj, "device"); | |
93964fd4 JB |
322 | write_unlock(&entry->rw_lock); |
323 | ||
26f03249 KM |
324 | ret = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); |
325 | WARN_ON(ret); | |
326 | ||
c7428422 | 327 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" path to \"%s\"\n", |
1da177e4 LT |
328 | entry->name, buf); |
329 | ||
330 | return count; | |
331 | } | |
332 | ||
333 | /** | |
334 | * pdcspath_layer_read - Extended layer (eg. SCSI ids) pretty printing. | |
335 | * @entry: An allocated and populated pdscpath_entry struct. | |
336 | * @buf: The output buffer to write to. | |
337 | * | |
338 | * We will call this function to format the output of the layer attribute file. | |
339 | */ | |
340 | static ssize_t | |
341 | pdcspath_layer_read(struct pdcspath_entry *entry, char *buf) | |
342 | { | |
343 | char *out = buf; | |
50f19697 | 344 | struct pdc_module_path *devpath; |
c7428422 | 345 | short i; |
1da177e4 LT |
346 | |
347 | if (!entry || !buf) | |
348 | return -EINVAL; | |
349 | ||
c7428422 | 350 | read_lock(&entry->rw_lock); |
1da177e4 | 351 | devpath = &entry->devpath; |
c7428422 TV |
352 | i = entry->ready; |
353 | read_unlock(&entry->rw_lock); | |
1da177e4 | 354 | |
c7428422 | 355 | if (!i) /* entry is not ready */ |
1da177e4 LT |
356 | return -ENODATA; |
357 | ||
447c233d | 358 | for (i = 0; i < 6 && devpath->layers[i]; i++) |
1da177e4 LT |
359 | out += sprintf(out, "%u ", devpath->layers[i]); |
360 | ||
361 | out += sprintf(out, "\n"); | |
362 | ||
363 | return out - buf; | |
364 | } | |
365 | ||
366 | /** | |
367 | * pdcspath_layer_write - This function handles extended layer modifying. | |
368 | * @entry: An allocated and populated pdscpath_entry struct. | |
369 | * @buf: The input buffer to read from. | |
370 | * @count: The number of bytes to be read. | |
371 | * | |
372 | * We will call this function to change the current layer value. | |
373 | * Layers are to be given '.'-delimited, without brackets. | |
374 | * XXX beware we are far less checky WRT input data provided than for hwpath. | |
375 | * Potential harm can be done, since there's no way to check the validity of | |
376 | * the layer fields. | |
377 | */ | |
378 | static ssize_t | |
379 | pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count) | |
380 | { | |
381 | unsigned int layers[6]; /* device-specific info (ctlr#, unit#, ...) */ | |
382 | unsigned short i; | |
c735483d | 383 | char in[64], *temp; |
1da177e4 LT |
384 | |
385 | if (!entry || !buf || !count) | |
386 | return -EINVAL; | |
387 | ||
388 | /* We'll use a local copy of buf */ | |
c735483d | 389 | count = min_t(size_t, count, sizeof(in)-1); |
f2193bb2 | 390 | strscpy(in, buf, count + 1); |
1da177e4 LT |
391 | |
392 | /* Let's clean up the target. 0 is a blank pattern */ | |
393 | memset(&layers, 0, sizeof(layers)); | |
394 | ||
395 | /* First, pick the first layer */ | |
396 | if (unlikely(!isdigit(*in))) | |
397 | return -EINVAL; | |
398 | layers[0] = simple_strtoul(in, NULL, 10); | |
399 | DPRINTK("%s: layer[0]: %d\n", __func__, layers[0]); | |
400 | ||
401 | temp = in; | |
402 | for (i=1; ((temp = strchr(temp, '.'))) && (likely(i<6)); i++) { | |
403 | if (unlikely(!isdigit(*(++temp)))) | |
404 | return -EINVAL; | |
405 | layers[i] = simple_strtoul(temp, NULL, 10); | |
406 | DPRINTK("%s: layer[%d]: %d\n", __func__, i, layers[i]); | |
407 | } | |
408 | ||
409 | /* So far so good, let's get in deep */ | |
c7428422 | 410 | write_lock(&entry->rw_lock); |
1da177e4 LT |
411 | |
412 | /* First, overwrite the current layers with the new ones, not touching | |
413 | the hardware path. */ | |
414 | memcpy(&entry->devpath.layers, &layers, sizeof(layers)); | |
415 | ||
416 | /* Now, dive in. Write back to the hardware */ | |
c7428422 TV |
417 | pdcspath_store(entry); |
418 | write_unlock(&entry->rw_lock); | |
1da177e4 | 419 | |
c7428422 | 420 | printk(KERN_INFO PDCS_PREFIX ": changed \"%s\" layers to \"%s\"\n", |
1da177e4 LT |
421 | entry->name, buf); |
422 | ||
423 | return count; | |
424 | } | |
425 | ||
426 | /** | |
427 | * pdcspath_attr_show - Generic read function call wrapper. | |
428 | * @kobj: The kobject to get info from. | |
429 | * @attr: The attribute looked upon. | |
430 | * @buf: The output buffer. | |
431 | */ | |
432 | static ssize_t | |
433 | pdcspath_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
434 | { | |
435 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
436 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
437 | ssize_t ret = 0; | |
438 | ||
1da177e4 LT |
439 | if (pdcs_attr->show) |
440 | ret = pdcs_attr->show(entry, buf); | |
441 | ||
442 | return ret; | |
443 | } | |
444 | ||
445 | /** | |
446 | * pdcspath_attr_store - Generic write function call wrapper. | |
447 | * @kobj: The kobject to write info to. | |
448 | * @attr: The attribute to be modified. | |
449 | * @buf: The input buffer. | |
450 | * @count: The size of the buffer. | |
451 | */ | |
452 | static ssize_t | |
453 | pdcspath_attr_store(struct kobject *kobj, struct attribute *attr, | |
454 | const char *buf, size_t count) | |
455 | { | |
456 | struct pdcspath_entry *entry = to_pdcspath_entry(kobj); | |
457 | struct pdcspath_attribute *pdcs_attr = to_pdcspath_attribute(attr); | |
458 | ssize_t ret = 0; | |
459 | ||
460 | if (!capable(CAP_SYS_ADMIN)) | |
461 | return -EACCES; | |
462 | ||
463 | if (pdcs_attr->store) | |
464 | ret = pdcs_attr->store(entry, buf, count); | |
465 | ||
466 | return ret; | |
467 | } | |
468 | ||
52cf25d0 | 469 | static const struct sysfs_ops pdcspath_attr_ops = { |
1da177e4 LT |
470 | .show = pdcspath_attr_show, |
471 | .store = pdcspath_attr_store, | |
472 | }; | |
473 | ||
474 | /* These are the two attributes of any PDC path. */ | |
c7428422 TV |
475 | static PATHS_ATTR(hwpath, 0644, pdcspath_hwpath_read, pdcspath_hwpath_write); |
476 | static PATHS_ATTR(layer, 0644, pdcspath_layer_read, pdcspath_layer_write); | |
1da177e4 LT |
477 | |
478 | static struct attribute *paths_subsys_attrs[] = { | |
479 | &paths_attr_hwpath.attr, | |
480 | &paths_attr_layer.attr, | |
481 | NULL, | |
482 | }; | |
75c09aad | 483 | ATTRIBUTE_GROUPS(paths_subsys); |
1da177e4 LT |
484 | |
485 | /* Specific kobject type for our PDC paths */ | |
486 | static struct kobj_type ktype_pdcspath = { | |
487 | .sysfs_ops = &pdcspath_attr_ops, | |
75c09aad | 488 | .default_groups = paths_subsys_groups, |
1da177e4 LT |
489 | }; |
490 | ||
491 | /* We hard define the 4 types of path we expect to find */ | |
492 | static PDCSPATH_ENTRY(PDCS_ADDR_PPRI, primary); | |
493 | static PDCSPATH_ENTRY(PDCS_ADDR_PCON, console); | |
494 | static PDCSPATH_ENTRY(PDCS_ADDR_PALT, alternative); | |
495 | static PDCSPATH_ENTRY(PDCS_ADDR_PKBD, keyboard); | |
496 | ||
497 | /* An array containing all PDC paths we will deal with */ | |
498 | static struct pdcspath_entry *pdcspath_entries[] = { | |
499 | &pdcspath_entry_primary, | |
500 | &pdcspath_entry_alternative, | |
501 | &pdcspath_entry_console, | |
502 | &pdcspath_entry_keyboard, | |
503 | NULL, | |
504 | }; | |
505 | ||
c7428422 TV |
506 | |
507 | /* For more insight of what's going on here, refer to PDC Procedures doc, | |
508 | * Section PDC_STABLE */ | |
509 | ||
1da177e4 | 510 | /** |
c7428422 | 511 | * pdcs_size_read - Stable Storage size output. |
f28a9877 HD |
512 | * @kobj: The kobject used to share data with userspace. |
513 | * @attr: The kobject attributes. | |
1da177e4 | 514 | * @buf: The output buffer to write to. |
1da177e4 | 515 | */ |
7f548217 GKH |
516 | static ssize_t pdcs_size_read(struct kobject *kobj, |
517 | struct kobj_attribute *attr, | |
518 | char *buf) | |
1da177e4 LT |
519 | { |
520 | char *out = buf; | |
823bccfc | 521 | |
7f548217 | 522 | if (!buf) |
1da177e4 | 523 | return -EINVAL; |
823bccfc | 524 | |
1da177e4 | 525 | /* show the size of the stable storage */ |
c7428422 | 526 | out += sprintf(out, "%ld\n", pdcs_size); |
1da177e4 | 527 | |
c7428422 TV |
528 | return out - buf; |
529 | } | |
530 | ||
531 | /** | |
532 | * pdcs_auto_read - Stable Storage autoboot/search flag output. | |
f28a9877 HD |
533 | * @kobj: The kobject used to share data with userspace. |
534 | * @attr: The kobject attributes. | |
c7428422 TV |
535 | * @buf: The output buffer to write to. |
536 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag | |
537 | */ | |
7f548217 GKH |
538 | static ssize_t pdcs_auto_read(struct kobject *kobj, |
539 | struct kobj_attribute *attr, | |
540 | char *buf, int knob) | |
c7428422 TV |
541 | { |
542 | char *out = buf; | |
543 | struct pdcspath_entry *pathentry; | |
67a5a59d | 544 | |
7f548217 | 545 | if (!buf) |
c7428422 TV |
546 | return -EINVAL; |
547 | ||
548 | /* Current flags are stored in primary boot path entry */ | |
549 | pathentry = &pdcspath_entry_primary; | |
550 | ||
551 | read_lock(&pathentry->rw_lock); | |
50f19697 | 552 | out += sprintf(out, "%s\n", (pathentry->devpath.path.flags & knob) ? |
c7428422 TV |
553 | "On" : "Off"); |
554 | read_unlock(&pathentry->rw_lock); | |
555 | ||
556 | return out - buf; | |
557 | } | |
558 | ||
559 | /** | |
560 | * pdcs_autoboot_read - Stable Storage autoboot flag output. | |
f28a9877 HD |
561 | * @kobj: The kobject used to share data with userspace. |
562 | * @attr: The kobject attributes. | |
c7428422 TV |
563 | * @buf: The output buffer to write to. |
564 | */ | |
7f548217 GKH |
565 | static ssize_t pdcs_autoboot_read(struct kobject *kobj, |
566 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 567 | { |
7f548217 | 568 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOBOOT); |
c7428422 TV |
569 | } |
570 | ||
571 | /** | |
572 | * pdcs_autosearch_read - Stable Storage autoboot flag output. | |
f28a9877 HD |
573 | * @kobj: The kobject used to share data with userspace. |
574 | * @attr: The kobject attributes. | |
c7428422 TV |
575 | * @buf: The output buffer to write to. |
576 | */ | |
7f548217 GKH |
577 | static ssize_t pdcs_autosearch_read(struct kobject *kobj, |
578 | struct kobj_attribute *attr, char *buf) | |
c7428422 | 579 | { |
7f548217 | 580 | return pdcs_auto_read(kobj, attr, buf, PF_AUTOSEARCH); |
c7428422 TV |
581 | } |
582 | ||
583 | /** | |
584 | * pdcs_timer_read - Stable Storage timer count output (in seconds). | |
f28a9877 HD |
585 | * @kobj: The kobject used to share data with userspace. |
586 | * @attr: The kobject attributes. | |
c7428422 TV |
587 | * @buf: The output buffer to write to. |
588 | * | |
589 | * The value of the timer field correponds to a number of seconds in powers of 2. | |
590 | */ | |
7f548217 GKH |
591 | static ssize_t pdcs_timer_read(struct kobject *kobj, |
592 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
593 | { |
594 | char *out = buf; | |
595 | struct pdcspath_entry *pathentry; | |
596 | ||
7f548217 | 597 | if (!buf) |
c7428422 TV |
598 | return -EINVAL; |
599 | ||
600 | /* Current flags are stored in primary boot path entry */ | |
601 | pathentry = &pdcspath_entry_primary; | |
602 | ||
603 | /* print the timer value in seconds */ | |
604 | read_lock(&pathentry->rw_lock); | |
50f19697 HD |
605 | out += sprintf(out, "%u\n", (pathentry->devpath.path.flags & PF_TIMER) ? |
606 | (1 << (pathentry->devpath.path.flags & PF_TIMER)) : 0); | |
c7428422 TV |
607 | read_unlock(&pathentry->rw_lock); |
608 | ||
609 | return out - buf; | |
610 | } | |
611 | ||
612 | /** | |
613 | * pdcs_osid_read - Stable Storage OS ID register output. | |
f28a9877 HD |
614 | * @kobj: The kobject used to share data with userspace. |
615 | * @attr: The kobject attributes. | |
c7428422 TV |
616 | * @buf: The output buffer to write to. |
617 | */ | |
7f548217 GKH |
618 | static ssize_t pdcs_osid_read(struct kobject *kobj, |
619 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
620 | { |
621 | char *out = buf; | |
c7428422 | 622 | |
7f548217 | 623 | if (!buf) |
c7428422 | 624 | return -EINVAL; |
1da177e4 | 625 | |
67a061a1 KM |
626 | out += sprintf(out, "%s dependent data (0x%.4x)\n", |
627 | os_id_to_string(pdcs_osid), pdcs_osid); | |
3f9edb53 TV |
628 | |
629 | return out - buf; | |
630 | } | |
631 | ||
632 | /** | |
633 | * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output. | |
f28a9877 HD |
634 | * @kobj: The kobject used to share data with userspace. |
635 | * @attr: The kobject attributes. | |
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. | |
f28a9877 HD |
662 | * @kobj: The kobject used to share data with userspace. |
663 | * @attr: The kobject attributes. | |
3f9edb53 TV |
664 | * @buf: The output buffer to write to. |
665 | * | |
666 | * I have NFC how to interpret the content of that register ;-). | |
667 | */ | |
7f548217 GKH |
668 | static ssize_t pdcs_diagnostic_read(struct kobject *kobj, |
669 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
670 | { |
671 | char *out = buf; | |
672 | u32 result; | |
673 | ||
7f548217 | 674 | if (!buf) |
3f9edb53 TV |
675 | return -EINVAL; |
676 | ||
677 | /* get diagnostic */ | |
678 | if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK) | |
679 | return -EIO; | |
680 | ||
681 | out += sprintf(out, "0x%.4x\n", (result >> 16)); | |
c7428422 TV |
682 | |
683 | return out - buf; | |
684 | } | |
685 | ||
686 | /** | |
687 | * pdcs_fastsize_read - Stable Storage FastSize register output. | |
f28a9877 HD |
688 | * @kobj: The kobject used to share data with userspace. |
689 | * @attr: The kobject attributes. | |
c7428422 TV |
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 | */ | |
7f548217 GKH |
694 | static ssize_t pdcs_fastsize_read(struct kobject *kobj, |
695 | struct kobj_attribute *attr, char *buf) | |
c7428422 TV |
696 | { |
697 | char *out = buf; | |
3f9edb53 | 698 | u32 result; |
c7428422 | 699 | |
7f548217 | 700 | if (!buf) |
c7428422 | 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. | |
f28a9877 HD |
718 | * @kobj: The kobject used to share data with userspace. |
719 | * @attr: The kobject attributes. | |
3f9edb53 TV |
720 | * @buf: The output buffer to write to. |
721 | * | |
722 | * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available. | |
723 | */ | |
7f548217 GKH |
724 | static ssize_t pdcs_osdep2_read(struct kobject *kobj, |
725 | struct kobj_attribute *attr, char *buf) | |
3f9edb53 TV |
726 | { |
727 | char *out = buf; | |
728 | unsigned long size; | |
729 | unsigned short i; | |
730 | u32 result; | |
731 | ||
732 | if (unlikely(pdcs_size <= 224)) | |
733 | return -ENODATA; | |
734 | ||
735 | size = pdcs_size - 224; | |
736 | ||
7f548217 | 737 | if (!buf) |
3f9edb53 TV |
738 | return -EINVAL; |
739 | ||
740 | for (i=0; i<size; i+=4) { | |
741 | if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result, | |
742 | sizeof(result)) != PDC_OK)) | |
743 | return -EIO; | |
744 | out += sprintf(out, "0x%.8x\n", result); | |
745 | } | |
746 | ||
747 | return out - buf; | |
748 | } | |
749 | ||
1da177e4 | 750 | /** |
c7428422 | 751 | * pdcs_auto_write - This function handles autoboot/search flag modifying. |
f28a9877 HD |
752 | * @kobj: The kobject used to share data with userspace. |
753 | * @attr: The kobject attributes. | |
1da177e4 LT |
754 | * @buf: The input buffer to read from. |
755 | * @count: The number of bytes to be read. | |
c7428422 | 756 | * @knob: The PF_AUTOBOOT or PF_AUTOSEARCH flag |
1da177e4 | 757 | * |
c7428422 | 758 | * We will call this function to change the current autoboot flag. |
1da177e4 | 759 | * We expect a precise syntax: |
c7428422 | 760 | * \"n\" (n == 0 or 1) to toggle AutoBoot Off or On |
1da177e4 | 761 | */ |
7f548217 GKH |
762 | static ssize_t pdcs_auto_write(struct kobject *kobj, |
763 | struct kobj_attribute *attr, const char *buf, | |
764 | size_t count, int knob) | |
1da177e4 LT |
765 | { |
766 | struct pdcspath_entry *pathentry; | |
767 | unsigned char flags; | |
94c457de | 768 | char in[8], *temp; |
1da177e4 LT |
769 | char c; |
770 | ||
771 | if (!capable(CAP_SYS_ADMIN)) | |
772 | return -EACCES; | |
773 | ||
7f548217 | 774 | if (!buf || !count) |
1da177e4 LT |
775 | return -EINVAL; |
776 | ||
777 | /* We'll use a local copy of buf */ | |
c735483d | 778 | count = min_t(size_t, count, sizeof(in)-1); |
f2193bb2 | 779 | strscpy(in, buf, count + 1); |
1da177e4 LT |
780 | |
781 | /* Current flags are stored in primary boot path entry */ | |
782 | pathentry = &pdcspath_entry_primary; | |
783 | ||
784 | /* Be nice to the existing flag record */ | |
c7428422 | 785 | read_lock(&pathentry->rw_lock); |
50f19697 | 786 | flags = pathentry->devpath.path.flags; |
c7428422 | 787 | read_unlock(&pathentry->rw_lock); |
1da177e4 LT |
788 | |
789 | DPRINTK("%s: flags before: 0x%X\n", __func__, flags); | |
e7d2860b AGR |
790 | |
791 | temp = skip_spaces(in); | |
792 | ||
1da177e4 LT |
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 */ | |
50f19697 | 807 | pathentry->devpath.path.flags = flags; |
1da177e4 LT |
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. | |
f28a9877 HD |
826 | * @kobj: The kobject used to share data with userspace. |
827 | * @attr: The kobject attributes. | |
c7428422 TV |
828 | * @buf: The input buffer to read from. |
829 | * @count: The number of bytes to be read. | |
830 | * | |
831 | * We will call this function to change the current boot flags. | |
832 | * We expect a precise syntax: | |
833 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
834 | */ | |
7f548217 GKH |
835 | static ssize_t pdcs_autoboot_write(struct kobject *kobj, |
836 | struct kobj_attribute *attr, | |
837 | const char *buf, size_t count) | |
c7428422 | 838 | { |
ff451d70 | 839 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOBOOT); |
c7428422 TV |
840 | } |
841 | ||
842 | /** | |
843 | * pdcs_autosearch_write - This function handles autosearch flag modifying. | |
f28a9877 HD |
844 | * @kobj: The kobject used to share data with userspace. |
845 | * @attr: The kobject attributes. | |
c7428422 TV |
846 | * @buf: The input buffer to read from. |
847 | * @count: The number of bytes to be read. | |
848 | * | |
849 | * We will call this function to change the current boot flags. | |
850 | * We expect a precise syntax: | |
851 | * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On | |
852 | */ | |
7f548217 GKH |
853 | static ssize_t pdcs_autosearch_write(struct kobject *kobj, |
854 | struct kobj_attribute *attr, | |
855 | const char *buf, size_t count) | |
c7428422 | 856 | { |
ff451d70 | 857 | return pdcs_auto_write(kobj, attr, buf, count, PF_AUTOSEARCH); |
c7428422 TV |
858 | } |
859 | ||
3f9edb53 TV |
860 | /** |
861 | * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input. | |
f28a9877 HD |
862 | * @kobj: The kobject used to share data with userspace. |
863 | * @attr: The kobject attributes. | |
3f9edb53 TV |
864 | * @buf: The input buffer to read from. |
865 | * @count: The number of bytes to be read. | |
866 | * | |
867 | * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte | |
868 | * write approach. It's up to userspace to deal with it when constructing | |
869 | * its input buffer. | |
870 | */ | |
7f548217 GKH |
871 | static ssize_t pdcs_osdep1_write(struct kobject *kobj, |
872 | struct kobj_attribute *attr, | |
873 | const char *buf, size_t count) | |
3f9edb53 TV |
874 | { |
875 | u8 in[16]; | |
876 | ||
877 | if (!capable(CAP_SYS_ADMIN)) | |
878 | return -EACCES; | |
879 | ||
7f548217 | 880 | if (!buf || !count) |
3f9edb53 TV |
881 | return -EINVAL; |
882 | ||
ec1fdc24 | 883 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
884 | return -EPERM; |
885 | ||
886 | if (count > 16) | |
887 | return -EMSGSIZE; | |
888 | ||
889 | /* We'll use a local copy of buf */ | |
890 | memset(in, 0, 16); | |
891 | memcpy(in, buf, count); | |
892 | ||
893 | if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK) | |
894 | return -EIO; | |
895 | ||
896 | return count; | |
897 | } | |
898 | ||
899 | /** | |
900 | * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input. | |
f28a9877 HD |
901 | * @kobj: The kobject used to share data with userspace. |
902 | * @attr: The kobject attributes. | |
3f9edb53 TV |
903 | * @buf: The input buffer to read from. |
904 | * @count: The number of bytes to be read. | |
905 | * | |
906 | * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a | |
907 | * byte-by-byte write approach. It's up to userspace to deal with it when | |
908 | * constructing its input buffer. | |
909 | */ | |
7f548217 GKH |
910 | static ssize_t pdcs_osdep2_write(struct kobject *kobj, |
911 | struct kobj_attribute *attr, | |
912 | const char *buf, size_t count) | |
3f9edb53 TV |
913 | { |
914 | unsigned long size; | |
915 | unsigned short i; | |
916 | u8 in[4]; | |
917 | ||
918 | if (!capable(CAP_SYS_ADMIN)) | |
919 | return -EACCES; | |
920 | ||
7f548217 | 921 | if (!buf || !count) |
3f9edb53 TV |
922 | return -EINVAL; |
923 | ||
924 | if (unlikely(pdcs_size <= 224)) | |
925 | return -ENOSYS; | |
926 | ||
ec1fdc24 | 927 | if (unlikely(pdcs_osid != OS_ID_LINUX)) |
3f9edb53 TV |
928 | return -EPERM; |
929 | ||
930 | size = pdcs_size - 224; | |
931 | ||
932 | if (count > size) | |
933 | return -EMSGSIZE; | |
934 | ||
935 | /* We'll use a local copy of buf */ | |
936 | ||
937 | for (i=0; i<count; i+=4) { | |
938 | memset(in, 0, 4); | |
939 | memcpy(in, buf+i, (count-i < 4) ? count-i : 4); | |
940 | if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in, | |
941 | sizeof(in)) != PDC_OK)) | |
942 | return -EIO; | |
943 | } | |
944 | ||
945 | return count; | |
946 | } | |
947 | ||
c7428422 TV |
948 | /* The remaining attributes. */ |
949 | static PDCS_ATTR(size, 0444, pdcs_size_read, NULL); | |
950 | static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write); | |
951 | static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write); | |
952 | static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL); | |
3f9edb53 TV |
953 | static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL); |
954 | static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write); | |
955 | static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL); | |
c7428422 | 956 | static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL); |
3f9edb53 | 957 | static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write); |
1da177e4 | 958 | |
7f548217 GKH |
959 | static struct attribute *pdcs_subsys_attrs[] = { |
960 | &pdcs_attr_size.attr, | |
961 | &pdcs_attr_autoboot.attr, | |
962 | &pdcs_attr_autosearch.attr, | |
963 | &pdcs_attr_timer.attr, | |
964 | &pdcs_attr_osid.attr, | |
965 | &pdcs_attr_osdep1.attr, | |
966 | &pdcs_attr_diagnostic.attr, | |
967 | &pdcs_attr_fastsize.attr, | |
968 | &pdcs_attr_osdep2.attr, | |
c7428422 | 969 | NULL, |
1da177e4 LT |
970 | }; |
971 | ||
343fdfb7 | 972 | static const struct attribute_group pdcs_attr_group = { |
7f548217 GKH |
973 | .attrs = pdcs_subsys_attrs, |
974 | }; | |
975 | ||
c829a5b4 | 976 | static struct kobject *stable_kobj; |
4443d07f | 977 | static struct kset *paths_kset; |
1da177e4 LT |
978 | |
979 | /** | |
980 | * pdcs_register_pathentries - Prepares path entries kobjects for sysfs usage. | |
981 | * | |
982 | * It creates kobjects corresponding to each path entry with nice sysfs | |
983 | * links to the real device. This is where the magic takes place: when | |
984 | * registering the subsystem attributes during module init, each kobject hereby | |
985 | * created will show in the sysfs tree as a folder containing files as defined | |
986 | * by path_subsys_attr[]. | |
987 | */ | |
988 | static inline int __init | |
989 | pdcs_register_pathentries(void) | |
990 | { | |
991 | unsigned short i; | |
992 | struct pdcspath_entry *entry; | |
4b991da7 | 993 | int err; |
1da177e4 | 994 | |
c7428422 TV |
995 | /* Initialize the entries rw_lock before anything else */ |
996 | for (i = 0; (entry = pdcspath_entries[i]); i++) | |
997 | rwlock_init(&entry->rw_lock); | |
998 | ||
1da177e4 | 999 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
c7428422 TV |
1000 | write_lock(&entry->rw_lock); |
1001 | err = pdcspath_fetch(entry); | |
1002 | write_unlock(&entry->rw_lock); | |
1003 | ||
1004 | if (err < 0) | |
1da177e4 LT |
1005 | continue; |
1006 | ||
4443d07f | 1007 | entry->kobj.kset = paths_kset; |
73f368cf GKH |
1008 | err = kobject_init_and_add(&entry->kobj, &ktype_pdcspath, NULL, |
1009 | "%s", entry->name); | |
d24846a4 ML |
1010 | if (err) { |
1011 | kobject_put(&entry->kobj); | |
4b991da7 | 1012 | return err; |
d24846a4 | 1013 | } |
73f368cf | 1014 | |
4b991da7 | 1015 | /* kobject is now registered */ |
c7428422 | 1016 | write_lock(&entry->rw_lock); |
4b991da7 | 1017 | entry->ready = 2; |
93964fd4 | 1018 | write_unlock(&entry->rw_lock); |
4b991da7 | 1019 | |
1da177e4 | 1020 | /* Add a nice symlink to the real device */ |
26f03249 KM |
1021 | if (entry->dev) { |
1022 | err = sysfs_create_link(&entry->kobj, &entry->dev->kobj, "device"); | |
1023 | WARN_ON(err); | |
1024 | } | |
c7428422 | 1025 | |
73f368cf | 1026 | kobject_uevent(&entry->kobj, KOBJ_ADD); |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * pdcs_unregister_pathentries - Routine called when unregistering the module. | |
1034 | */ | |
4b991da7 | 1035 | static inline void |
1da177e4 LT |
1036 | pdcs_unregister_pathentries(void) |
1037 | { | |
1038 | unsigned short i; | |
1039 | struct pdcspath_entry *entry; | |
1040 | ||
c7428422 TV |
1041 | for (i = 0; (entry = pdcspath_entries[i]); i++) { |
1042 | read_lock(&entry->rw_lock); | |
4b991da7 | 1043 | if (entry->ready >= 2) |
c10997f6 | 1044 | kobject_put(&entry->kobj); |
c7428422 TV |
1045 | read_unlock(&entry->rw_lock); |
1046 | } | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | /* | |
c7428422 TV |
1050 | * For now we register the stable subsystem with the firmware subsystem |
1051 | * and the paths subsystem with the stable subsystem | |
1da177e4 LT |
1052 | */ |
1053 | static int __init | |
1054 | pdc_stable_init(void) | |
1055 | { | |
f28a9877 | 1056 | int rc = 0, error; |
3f9edb53 | 1057 | u32 result; |
1da177e4 LT |
1058 | |
1059 | /* find the size of the stable storage */ | |
1060 | if (pdc_stable_get_size(&pdcs_size) != PDC_OK) | |
1061 | return -ENODEV; | |
1062 | ||
c7428422 TV |
1063 | /* make sure we have enough data */ |
1064 | if (pdcs_size < 96) | |
1065 | return -ENODATA; | |
1066 | ||
1067 | printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION); | |
1da177e4 | 1068 | |
3f9edb53 TV |
1069 | /* get OSID */ |
1070 | if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK) | |
1071 | return -EIO; | |
1072 | ||
1073 | /* the actual result is 16 bits away */ | |
1074 | pdcs_osid = (u16)(result >> 16); | |
1075 | ||
c829a5b4 GKH |
1076 | /* For now we'll register the directory at /sys/firmware/stable */ |
1077 | stable_kobj = kobject_create_and_add("stable", firmware_kobj); | |
1078 | if (!stable_kobj) { | |
4443d07f | 1079 | rc = -ENOMEM; |
4b991da7 | 1080 | goto fail_firmreg; |
4443d07f | 1081 | } |
1da177e4 | 1082 | |
c7428422 | 1083 | /* Don't forget the root entries */ |
ff451d70 | 1084 | error = sysfs_create_group(stable_kobj, &pdcs_attr_group); |
f28a9877 HD |
1085 | if (error) { |
1086 | rc = -ENOMEM; | |
1087 | goto fail_ksetreg; | |
1088 | } | |
7f548217 | 1089 | |
4443d07f | 1090 | /* register the paths kset as a child of the stable kset */ |
c829a5b4 | 1091 | paths_kset = kset_create_and_add("paths", NULL, stable_kobj); |
4443d07f GKH |
1092 | if (!paths_kset) { |
1093 | rc = -ENOMEM; | |
1094 | goto fail_ksetreg; | |
1095 | } | |
1da177e4 | 1096 | |
4443d07f | 1097 | /* now we create all "files" for the paths kset */ |
4b991da7 TV |
1098 | if ((rc = pdcs_register_pathentries())) |
1099 | goto fail_pdcsreg; | |
1100 | ||
1101 | return rc; | |
1da177e4 | 1102 | |
4b991da7 TV |
1103 | fail_pdcsreg: |
1104 | pdcs_unregister_pathentries(); | |
4443d07f | 1105 | kset_unregister(paths_kset); |
4b991da7 | 1106 | |
4443d07f | 1107 | fail_ksetreg: |
c10997f6 | 1108 | kobject_put(stable_kobj); |
4b991da7 TV |
1109 | |
1110 | fail_firmreg: | |
c7428422 | 1111 | printk(KERN_INFO PDCS_PREFIX " bailing out\n"); |
4b991da7 | 1112 | return rc; |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | static void __exit | |
1116 | pdc_stable_exit(void) | |
1117 | { | |
1118 | pdcs_unregister_pathentries(); | |
4443d07f | 1119 | kset_unregister(paths_kset); |
c10997f6 | 1120 | kobject_put(stable_kobj); |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | ||
1124 | module_init(pdc_stable_init); | |
1125 | module_exit(pdc_stable_exit); |