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d9523678 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
f30c2269 | 3 | * linux/drivers/firmware/edd.c |
1da177e4 LT |
4 | * Copyright (C) 2002, 2003, 2004 Dell Inc. |
5 | * by Matt Domsch <Matt_Domsch@dell.com> | |
6 | * disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya | |
7 | * legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net> | |
8 | * | |
9 | * BIOS Enhanced Disk Drive Services (EDD) | |
10 | * conformant to T13 Committee www.t13.org | |
11 | * projects 1572D, 1484D, 1386D, 1226DT | |
12 | * | |
13 | * This code takes information provided by BIOS EDD calls | |
14 | * fn41 - Check Extensions Present and | |
d48140e3 | 15 | * fn48 - Get Device Parameters with EDD extensions |
1da177e4 LT |
16 | * made in setup.S, copied to safe structures in setup.c, |
17 | * and presents it in sysfs. | |
18 | * | |
631dd1a8 | 19 | * Please see http://linux.dell.com/edd/results.html for |
1da177e4 | 20 | * the list of BIOSs which have been reported to implement EDD. |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/stat.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/limits.h> | |
32 | #include <linux/device.h> | |
33 | #include <linux/pci.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/edd.h> | |
36 | ||
37 | #define EDD_VERSION "0.16" | |
38 | #define EDD_DATE "2004-Jun-25" | |
39 | ||
40 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
41 | MODULE_DESCRIPTION("sysfs interface to BIOS EDD information"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | MODULE_VERSION(EDD_VERSION); | |
44 | ||
45 | #define left (PAGE_SIZE - (p - buf) - 1) | |
46 | ||
47 | struct edd_device { | |
48 | unsigned int index; | |
49 | unsigned int mbr_signature; | |
50 | struct edd_info *info; | |
51 | struct kobject kobj; | |
52 | }; | |
53 | ||
54 | struct edd_attribute { | |
55 | struct attribute attr; | |
56 | ssize_t(*show) (struct edd_device * edev, char *buf); | |
57 | int (*test) (struct edd_device * edev); | |
58 | }; | |
59 | ||
60 | /* forward declarations */ | |
61 | static int edd_dev_is_type(struct edd_device *edev, const char *type); | |
62 | static struct pci_dev *edd_get_pci_dev(struct edd_device *edev); | |
63 | ||
64 | static struct edd_device *edd_devices[EDD_MBR_SIG_MAX]; | |
65 | ||
66 | #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \ | |
67 | struct edd_attribute edd_attr_##_name = { \ | |
7b595756 | 68 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
1da177e4 LT |
69 | .show = _show, \ |
70 | .test = _test, \ | |
71 | }; | |
72 | ||
73 | static int | |
74 | edd_has_mbr_signature(struct edd_device *edev) | |
75 | { | |
76 | return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX); | |
77 | } | |
78 | ||
79 | static int | |
80 | edd_has_edd_info(struct edd_device *edev) | |
81 | { | |
82 | return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR); | |
83 | } | |
84 | ||
85 | static inline struct edd_info * | |
86 | edd_dev_get_info(struct edd_device *edev) | |
87 | { | |
88 | return edev->info; | |
89 | } | |
90 | ||
91 | static inline void | |
92 | edd_dev_set_info(struct edd_device *edev, int i) | |
93 | { | |
94 | edev->index = i; | |
95 | if (edd_has_mbr_signature(edev)) | |
96 | edev->mbr_signature = edd.mbr_signature[i]; | |
97 | if (edd_has_edd_info(edev)) | |
98 | edev->info = &edd.edd_info[i]; | |
99 | } | |
100 | ||
101 | #define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr) | |
102 | #define to_edd_device(obj) container_of(obj,struct edd_device,kobj) | |
103 | ||
104 | static ssize_t | |
105 | edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf) | |
106 | { | |
107 | struct edd_device *dev = to_edd_device(kobj); | |
108 | struct edd_attribute *edd_attr = to_edd_attr(attr); | |
70f2817a | 109 | ssize_t ret = -EIO; |
1da177e4 LT |
110 | |
111 | if (edd_attr->show) | |
112 | ret = edd_attr->show(dev, buf); | |
113 | return ret; | |
114 | } | |
115 | ||
52cf25d0 | 116 | static const struct sysfs_ops edd_attr_ops = { |
1da177e4 LT |
117 | .show = edd_attr_show, |
118 | }; | |
119 | ||
120 | static ssize_t | |
121 | edd_show_host_bus(struct edd_device *edev, char *buf) | |
122 | { | |
123 | struct edd_info *info; | |
124 | char *p = buf; | |
125 | int i; | |
126 | ||
127 | if (!edev) | |
128 | return -EINVAL; | |
129 | info = edd_dev_get_info(edev); | |
130 | if (!info || !buf) | |
131 | return -EINVAL; | |
132 | ||
133 | for (i = 0; i < 4; i++) { | |
134 | if (isprint(info->params.host_bus_type[i])) { | |
135 | p += scnprintf(p, left, "%c", info->params.host_bus_type[i]); | |
136 | } else { | |
137 | p += scnprintf(p, left, " "); | |
138 | } | |
139 | } | |
140 | ||
141 | if (!strncmp(info->params.host_bus_type, "ISA", 3)) { | |
142 | p += scnprintf(p, left, "\tbase_address: %x\n", | |
143 | info->params.interface_path.isa.base_address); | |
144 | } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) || | |
044aceef MC |
145 | !strncmp(info->params.host_bus_type, "PCI", 3) || |
146 | !strncmp(info->params.host_bus_type, "XPRS", 4)) { | |
1da177e4 LT |
147 | p += scnprintf(p, left, |
148 | "\t%02x:%02x.%d channel: %u\n", | |
149 | info->params.interface_path.pci.bus, | |
150 | info->params.interface_path.pci.slot, | |
151 | info->params.interface_path.pci.function, | |
152 | info->params.interface_path.pci.channel); | |
153 | } else if (!strncmp(info->params.host_bus_type, "IBND", 4) || | |
1da177e4 LT |
154 | !strncmp(info->params.host_bus_type, "HTPT", 4)) { |
155 | p += scnprintf(p, left, | |
156 | "\tTBD: %llx\n", | |
157 | info->params.interface_path.ibnd.reserved); | |
158 | ||
159 | } else { | |
160 | p += scnprintf(p, left, "\tunknown: %llx\n", | |
161 | info->params.interface_path.unknown.reserved); | |
162 | } | |
163 | return (p - buf); | |
164 | } | |
165 | ||
166 | static ssize_t | |
167 | edd_show_interface(struct edd_device *edev, char *buf) | |
168 | { | |
169 | struct edd_info *info; | |
170 | char *p = buf; | |
171 | int i; | |
172 | ||
173 | if (!edev) | |
174 | return -EINVAL; | |
175 | info = edd_dev_get_info(edev); | |
176 | if (!info || !buf) | |
177 | return -EINVAL; | |
178 | ||
179 | for (i = 0; i < 8; i++) { | |
180 | if (isprint(info->params.interface_type[i])) { | |
181 | p += scnprintf(p, left, "%c", info->params.interface_type[i]); | |
182 | } else { | |
183 | p += scnprintf(p, left, " "); | |
184 | } | |
185 | } | |
186 | if (!strncmp(info->params.interface_type, "ATAPI", 5)) { | |
187 | p += scnprintf(p, left, "\tdevice: %u lun: %u\n", | |
188 | info->params.device_path.atapi.device, | |
189 | info->params.device_path.atapi.lun); | |
190 | } else if (!strncmp(info->params.interface_type, "ATA", 3)) { | |
191 | p += scnprintf(p, left, "\tdevice: %u\n", | |
192 | info->params.device_path.ata.device); | |
193 | } else if (!strncmp(info->params.interface_type, "SCSI", 4)) { | |
194 | p += scnprintf(p, left, "\tid: %u lun: %llu\n", | |
195 | info->params.device_path.scsi.id, | |
196 | info->params.device_path.scsi.lun); | |
197 | } else if (!strncmp(info->params.interface_type, "USB", 3)) { | |
198 | p += scnprintf(p, left, "\tserial_number: %llx\n", | |
199 | info->params.device_path.usb.serial_number); | |
200 | } else if (!strncmp(info->params.interface_type, "1394", 4)) { | |
201 | p += scnprintf(p, left, "\teui: %llx\n", | |
202 | info->params.device_path.i1394.eui); | |
203 | } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) { | |
204 | p += scnprintf(p, left, "\twwid: %llx lun: %llx\n", | |
205 | info->params.device_path.fibre.wwid, | |
206 | info->params.device_path.fibre.lun); | |
207 | } else if (!strncmp(info->params.interface_type, "I2O", 3)) { | |
208 | p += scnprintf(p, left, "\tidentity_tag: %llx\n", | |
209 | info->params.device_path.i2o.identity_tag); | |
210 | } else if (!strncmp(info->params.interface_type, "RAID", 4)) { | |
211 | p += scnprintf(p, left, "\tidentity_tag: %x\n", | |
212 | info->params.device_path.raid.array_number); | |
213 | } else if (!strncmp(info->params.interface_type, "SATA", 4)) { | |
214 | p += scnprintf(p, left, "\tdevice: %u\n", | |
215 | info->params.device_path.sata.device); | |
216 | } else { | |
217 | p += scnprintf(p, left, "\tunknown: %llx %llx\n", | |
218 | info->params.device_path.unknown.reserved1, | |
219 | info->params.device_path.unknown.reserved2); | |
220 | } | |
221 | ||
222 | return (p - buf); | |
223 | } | |
224 | ||
225 | /** | |
226 | * edd_show_raw_data() - copies raw data to buffer for userspace to parse | |
6e8c8188 RD |
227 | * @edev: target edd_device |
228 | * @buf: output buffer | |
1da177e4 LT |
229 | * |
230 | * Returns: number of bytes written, or -EINVAL on failure | |
231 | */ | |
232 | static ssize_t | |
233 | edd_show_raw_data(struct edd_device *edev, char *buf) | |
234 | { | |
235 | struct edd_info *info; | |
236 | ssize_t len = sizeof (info->params); | |
237 | if (!edev) | |
238 | return -EINVAL; | |
239 | info = edd_dev_get_info(edev); | |
240 | if (!info || !buf) | |
241 | return -EINVAL; | |
242 | ||
243 | if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) | |
244 | len = info->params.length; | |
245 | ||
246 | /* In case of buggy BIOSs */ | |
247 | if (len > (sizeof(info->params))) | |
248 | len = sizeof(info->params); | |
249 | ||
250 | memcpy(buf, &info->params, len); | |
251 | return len; | |
252 | } | |
253 | ||
254 | static ssize_t | |
255 | edd_show_version(struct edd_device *edev, char *buf) | |
256 | { | |
257 | struct edd_info *info; | |
258 | char *p = buf; | |
259 | if (!edev) | |
260 | return -EINVAL; | |
261 | info = edd_dev_get_info(edev); | |
262 | if (!info || !buf) | |
263 | return -EINVAL; | |
264 | ||
265 | p += scnprintf(p, left, "0x%02x\n", info->version); | |
266 | return (p - buf); | |
267 | } | |
268 | ||
269 | static ssize_t | |
270 | edd_show_mbr_signature(struct edd_device *edev, char *buf) | |
271 | { | |
272 | char *p = buf; | |
273 | p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature); | |
274 | return (p - buf); | |
275 | } | |
276 | ||
277 | static ssize_t | |
278 | edd_show_extensions(struct edd_device *edev, char *buf) | |
279 | { | |
280 | struct edd_info *info; | |
281 | char *p = buf; | |
282 | if (!edev) | |
283 | return -EINVAL; | |
284 | info = edd_dev_get_info(edev); | |
285 | if (!info || !buf) | |
286 | return -EINVAL; | |
287 | ||
288 | if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) { | |
289 | p += scnprintf(p, left, "Fixed disk access\n"); | |
290 | } | |
291 | if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) { | |
292 | p += scnprintf(p, left, "Device locking and ejecting\n"); | |
293 | } | |
294 | if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) { | |
295 | p += scnprintf(p, left, "Enhanced Disk Drive support\n"); | |
296 | } | |
297 | if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) { | |
298 | p += scnprintf(p, left, "64-bit extensions\n"); | |
299 | } | |
300 | return (p - buf); | |
301 | } | |
302 | ||
303 | static ssize_t | |
304 | edd_show_info_flags(struct edd_device *edev, char *buf) | |
305 | { | |
306 | struct edd_info *info; | |
307 | char *p = buf; | |
308 | if (!edev) | |
309 | return -EINVAL; | |
310 | info = edd_dev_get_info(edev); | |
311 | if (!info || !buf) | |
312 | return -EINVAL; | |
313 | ||
314 | if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT) | |
315 | p += scnprintf(p, left, "DMA boundary error transparent\n"); | |
316 | if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID) | |
317 | p += scnprintf(p, left, "geometry valid\n"); | |
318 | if (info->params.info_flags & EDD_INFO_REMOVABLE) | |
319 | p += scnprintf(p, left, "removable\n"); | |
320 | if (info->params.info_flags & EDD_INFO_WRITE_VERIFY) | |
321 | p += scnprintf(p, left, "write verify\n"); | |
322 | if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION) | |
323 | p += scnprintf(p, left, "media change notification\n"); | |
324 | if (info->params.info_flags & EDD_INFO_LOCKABLE) | |
325 | p += scnprintf(p, left, "lockable\n"); | |
326 | if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT) | |
327 | p += scnprintf(p, left, "no media present\n"); | |
328 | if (info->params.info_flags & EDD_INFO_USE_INT13_FN50) | |
329 | p += scnprintf(p, left, "use int13 fn50\n"); | |
330 | return (p - buf); | |
331 | } | |
332 | ||
333 | static ssize_t | |
334 | edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf) | |
335 | { | |
336 | struct edd_info *info; | |
337 | char *p = buf; | |
338 | if (!edev) | |
339 | return -EINVAL; | |
340 | info = edd_dev_get_info(edev); | |
341 | if (!info || !buf) | |
342 | return -EINVAL; | |
343 | ||
dbdd24ea | 344 | p += scnprintf(p, left, "%u\n", info->legacy_max_cylinder); |
1da177e4 LT |
345 | return (p - buf); |
346 | } | |
347 | ||
348 | static ssize_t | |
349 | edd_show_legacy_max_head(struct edd_device *edev, char *buf) | |
350 | { | |
351 | struct edd_info *info; | |
352 | char *p = buf; | |
353 | if (!edev) | |
354 | return -EINVAL; | |
355 | info = edd_dev_get_info(edev); | |
356 | if (!info || !buf) | |
357 | return -EINVAL; | |
358 | ||
dbdd24ea | 359 | p += scnprintf(p, left, "%u\n", info->legacy_max_head); |
1da177e4 LT |
360 | return (p - buf); |
361 | } | |
362 | ||
363 | static ssize_t | |
364 | edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf) | |
365 | { | |
366 | struct edd_info *info; | |
367 | char *p = buf; | |
368 | if (!edev) | |
369 | return -EINVAL; | |
370 | info = edd_dev_get_info(edev); | |
371 | if (!info || !buf) | |
372 | return -EINVAL; | |
373 | ||
dbdd24ea | 374 | p += scnprintf(p, left, "%u\n", info->legacy_sectors_per_track); |
1da177e4 LT |
375 | return (p - buf); |
376 | } | |
377 | ||
378 | static ssize_t | |
379 | edd_show_default_cylinders(struct edd_device *edev, char *buf) | |
380 | { | |
381 | struct edd_info *info; | |
382 | char *p = buf; | |
383 | if (!edev) | |
384 | return -EINVAL; | |
385 | info = edd_dev_get_info(edev); | |
386 | if (!info || !buf) | |
387 | return -EINVAL; | |
388 | ||
389 | p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders); | |
390 | return (p - buf); | |
391 | } | |
392 | ||
393 | static ssize_t | |
394 | edd_show_default_heads(struct edd_device *edev, char *buf) | |
395 | { | |
396 | struct edd_info *info; | |
397 | char *p = buf; | |
398 | if (!edev) | |
399 | return -EINVAL; | |
400 | info = edd_dev_get_info(edev); | |
401 | if (!info || !buf) | |
402 | return -EINVAL; | |
403 | ||
404 | p += scnprintf(p, left, "%u\n", info->params.num_default_heads); | |
405 | return (p - buf); | |
406 | } | |
407 | ||
408 | static ssize_t | |
409 | edd_show_default_sectors_per_track(struct edd_device *edev, char *buf) | |
410 | { | |
411 | struct edd_info *info; | |
412 | char *p = buf; | |
413 | if (!edev) | |
414 | return -EINVAL; | |
415 | info = edd_dev_get_info(edev); | |
416 | if (!info || !buf) | |
417 | return -EINVAL; | |
418 | ||
419 | p += scnprintf(p, left, "%u\n", info->params.sectors_per_track); | |
420 | return (p - buf); | |
421 | } | |
422 | ||
423 | static ssize_t | |
424 | edd_show_sectors(struct edd_device *edev, char *buf) | |
425 | { | |
426 | struct edd_info *info; | |
427 | char *p = buf; | |
428 | if (!edev) | |
429 | return -EINVAL; | |
430 | info = edd_dev_get_info(edev); | |
431 | if (!info || !buf) | |
432 | return -EINVAL; | |
433 | ||
434 | p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors); | |
435 | return (p - buf); | |
436 | } | |
437 | ||
438 | ||
439 | /* | |
440 | * Some device instances may not have all the above attributes, | |
441 | * or the attribute values may be meaningless (i.e. if | |
442 | * the device is < EDD 3.0, it won't have host_bus and interface | |
443 | * information), so don't bother making files for them. Likewise | |
444 | * if the default_{cylinders,heads,sectors_per_track} values | |
445 | * are zero, the BIOS doesn't provide sane values, don't bother | |
446 | * creating files for them either. | |
447 | */ | |
448 | ||
449 | static int | |
450 | edd_has_legacy_max_cylinder(struct edd_device *edev) | |
451 | { | |
452 | struct edd_info *info; | |
453 | if (!edev) | |
454 | return 0; | |
455 | info = edd_dev_get_info(edev); | |
456 | if (!info) | |
457 | return 0; | |
458 | return info->legacy_max_cylinder > 0; | |
459 | } | |
460 | ||
461 | static int | |
462 | edd_has_legacy_max_head(struct edd_device *edev) | |
463 | { | |
464 | struct edd_info *info; | |
465 | if (!edev) | |
466 | return 0; | |
467 | info = edd_dev_get_info(edev); | |
468 | if (!info) | |
469 | return 0; | |
470 | return info->legacy_max_head > 0; | |
471 | } | |
472 | ||
473 | static int | |
474 | edd_has_legacy_sectors_per_track(struct edd_device *edev) | |
475 | { | |
476 | struct edd_info *info; | |
477 | if (!edev) | |
478 | return 0; | |
479 | info = edd_dev_get_info(edev); | |
480 | if (!info) | |
481 | return 0; | |
482 | return info->legacy_sectors_per_track > 0; | |
483 | } | |
484 | ||
485 | static int | |
486 | edd_has_default_cylinders(struct edd_device *edev) | |
487 | { | |
488 | struct edd_info *info; | |
489 | if (!edev) | |
490 | return 0; | |
491 | info = edd_dev_get_info(edev); | |
492 | if (!info) | |
493 | return 0; | |
494 | return info->params.num_default_cylinders > 0; | |
495 | } | |
496 | ||
497 | static int | |
498 | edd_has_default_heads(struct edd_device *edev) | |
499 | { | |
500 | struct edd_info *info; | |
501 | if (!edev) | |
502 | return 0; | |
503 | info = edd_dev_get_info(edev); | |
504 | if (!info) | |
505 | return 0; | |
506 | return info->params.num_default_heads > 0; | |
507 | } | |
508 | ||
509 | static int | |
510 | edd_has_default_sectors_per_track(struct edd_device *edev) | |
511 | { | |
512 | struct edd_info *info; | |
513 | if (!edev) | |
514 | return 0; | |
515 | info = edd_dev_get_info(edev); | |
516 | if (!info) | |
517 | return 0; | |
518 | return info->params.sectors_per_track > 0; | |
519 | } | |
520 | ||
521 | static int | |
522 | edd_has_edd30(struct edd_device *edev) | |
523 | { | |
524 | struct edd_info *info; | |
0c612270 GN |
525 | int i; |
526 | u8 csum = 0; | |
1da177e4 LT |
527 | |
528 | if (!edev) | |
529 | return 0; | |
530 | info = edd_dev_get_info(edev); | |
531 | if (!info) | |
532 | return 0; | |
533 | ||
534 | if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) { | |
535 | return 0; | |
536 | } | |
537 | ||
0c612270 GN |
538 | |
539 | /* We support only T13 spec */ | |
540 | if (info->params.device_path_info_length != 44) | |
541 | return 0; | |
542 | ||
543 | for (i = 30; i < info->params.device_path_info_length + 30; i++) | |
544 | csum += *(((u8 *)&info->params) + i); | |
545 | ||
546 | if (csum) | |
1da177e4 | 547 | return 0; |
1da177e4 LT |
548 | |
549 | return 1; | |
550 | } | |
551 | ||
552 | ||
553 | static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info); | |
554 | static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info); | |
555 | static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info); | |
556 | static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info); | |
557 | static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info); | |
558 | static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444, | |
559 | edd_show_legacy_max_cylinder, | |
560 | edd_has_legacy_max_cylinder); | |
561 | static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head, | |
562 | edd_has_legacy_max_head); | |
563 | static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444, | |
564 | edd_show_legacy_sectors_per_track, | |
565 | edd_has_legacy_sectors_per_track); | |
566 | static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders, | |
567 | edd_has_default_cylinders); | |
568 | static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads, | |
569 | edd_has_default_heads); | |
570 | static EDD_DEVICE_ATTR(default_sectors_per_track, 0444, | |
571 | edd_show_default_sectors_per_track, | |
572 | edd_has_default_sectors_per_track); | |
573 | static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30); | |
574 | static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30); | |
575 | static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature); | |
576 | ||
577 | ||
578 | /* These are default attributes that are added for every edd | |
579 | * device discovered. There are none. | |
580 | */ | |
581 | static struct attribute * def_attrs[] = { | |
582 | NULL, | |
583 | }; | |
584 | ||
585 | /* These attributes are conditional and only added for some devices. */ | |
586 | static struct edd_attribute * edd_attrs[] = { | |
587 | &edd_attr_raw_data, | |
588 | &edd_attr_version, | |
589 | &edd_attr_extensions, | |
590 | &edd_attr_info_flags, | |
591 | &edd_attr_sectors, | |
592 | &edd_attr_legacy_max_cylinder, | |
593 | &edd_attr_legacy_max_head, | |
594 | &edd_attr_legacy_sectors_per_track, | |
595 | &edd_attr_default_cylinders, | |
596 | &edd_attr_default_heads, | |
597 | &edd_attr_default_sectors_per_track, | |
598 | &edd_attr_interface, | |
599 | &edd_attr_host_bus, | |
600 | &edd_attr_mbr_signature, | |
601 | NULL, | |
602 | }; | |
603 | ||
604 | /** | |
605 | * edd_release - free edd structure | |
606 | * @kobj: kobject of edd structure | |
607 | * | |
608 | * This is called when the refcount of the edd structure | |
609 | * reaches 0. This should happen right after we unregister, | |
610 | * but just in case, we use the release callback anyway. | |
611 | */ | |
612 | ||
613 | static void edd_release(struct kobject * kobj) | |
614 | { | |
615 | struct edd_device * dev = to_edd_device(kobj); | |
616 | kfree(dev); | |
617 | } | |
618 | ||
e89a4116 | 619 | static struct kobj_type edd_ktype = { |
1da177e4 LT |
620 | .release = edd_release, |
621 | .sysfs_ops = &edd_attr_ops, | |
622 | .default_attrs = def_attrs, | |
623 | }; | |
624 | ||
9651d350 | 625 | static struct kset *edd_kset; |
1da177e4 LT |
626 | |
627 | ||
628 | /** | |
629 | * edd_dev_is_type() - is this EDD device a 'type' device? | |
6e8c8188 RD |
630 | * @edev: target edd_device |
631 | * @type: a host bus or interface identifier string per the EDD spec | |
1da177e4 LT |
632 | * |
633 | * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise. | |
634 | */ | |
635 | static int | |
636 | edd_dev_is_type(struct edd_device *edev, const char *type) | |
637 | { | |
638 | struct edd_info *info; | |
639 | if (!edev) | |
640 | return 0; | |
641 | info = edd_dev_get_info(edev); | |
642 | ||
643 | if (type && info) { | |
644 | if (!strncmp(info->params.host_bus_type, type, strlen(type)) || | |
645 | !strncmp(info->params.interface_type, type, strlen(type))) | |
646 | return 1; | |
647 | } | |
648 | return 0; | |
649 | } | |
650 | ||
651 | /** | |
652 | * edd_get_pci_dev() - finds pci_dev that matches edev | |
6e8c8188 | 653 | * @edev: edd_device |
1da177e4 LT |
654 | * |
655 | * Returns pci_dev if found, or NULL | |
656 | */ | |
657 | static struct pci_dev * | |
658 | edd_get_pci_dev(struct edd_device *edev) | |
659 | { | |
660 | struct edd_info *info = edd_dev_get_info(edev); | |
661 | ||
044aceef | 662 | if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) { |
2c2457a4 SK |
663 | return pci_get_domain_bus_and_slot(0, |
664 | info->params.interface_path.pci.bus, | |
665 | PCI_DEVFN(info->params.interface_path.pci.slot, | |
666 | info->params.interface_path.pci.function)); | |
1da177e4 LT |
667 | } |
668 | return NULL; | |
669 | } | |
670 | ||
671 | static int | |
672 | edd_create_symlink_to_pcidev(struct edd_device *edev) | |
673 | { | |
674 | ||
675 | struct pci_dev *pci_dev = edd_get_pci_dev(edev); | |
1b28f22a | 676 | int ret; |
1da177e4 LT |
677 | if (!pci_dev) |
678 | return 1; | |
1b28f22a AC |
679 | ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev"); |
680 | pci_dev_put(pci_dev); | |
681 | return ret; | |
1da177e4 LT |
682 | } |
683 | ||
684 | static inline void | |
685 | edd_device_unregister(struct edd_device *edev) | |
686 | { | |
c10997f6 | 687 | kobject_put(&edev->kobj); |
1da177e4 LT |
688 | } |
689 | ||
690 | static void edd_populate_dir(struct edd_device * edev) | |
691 | { | |
692 | struct edd_attribute * attr; | |
693 | int error = 0; | |
694 | int i; | |
695 | ||
696 | for (i = 0; (attr = edd_attrs[i]) && !error; i++) { | |
697 | if (!attr->test || | |
698 | (attr->test && attr->test(edev))) | |
699 | error = sysfs_create_file(&edev->kobj,&attr->attr); | |
700 | } | |
701 | ||
702 | if (!error) { | |
703 | edd_create_symlink_to_pcidev(edev); | |
704 | } | |
705 | } | |
706 | ||
707 | static int | |
708 | edd_device_register(struct edd_device *edev, int i) | |
709 | { | |
710 | int error; | |
711 | ||
712 | if (!edev) | |
713 | return 1; | |
1da177e4 | 714 | edd_dev_set_info(edev, i); |
9651d350 | 715 | edev->kobj.kset = edd_kset; |
dd002e80 GKH |
716 | error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL, |
717 | "int13_dev%02x", 0x80 + i); | |
718 | if (!error) { | |
1da177e4 | 719 | edd_populate_dir(edev); |
dd002e80 GKH |
720 | kobject_uevent(&edev->kobj, KOBJ_ADD); |
721 | } | |
1da177e4 LT |
722 | return error; |
723 | } | |
724 | ||
725 | static inline int edd_num_devices(void) | |
726 | { | |
727 | return max_t(unsigned char, | |
728 | min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr), | |
729 | min_t(unsigned char, EDDMAXNR, edd.edd_info_nr)); | |
730 | } | |
731 | ||
732 | /** | |
733 | * edd_init() - creates sysfs tree of EDD data | |
734 | */ | |
735 | static int __init | |
736 | edd_init(void) | |
737 | { | |
1986aaf8 | 738 | int i; |
1da177e4 LT |
739 | int rc=0; |
740 | struct edd_device *edev; | |
741 | ||
bade9835 JT |
742 | if (!edd_num_devices()) |
743 | return -ENODEV; | |
744 | ||
1da177e4 LT |
745 | printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n", |
746 | EDD_VERSION, EDD_DATE, edd_num_devices()); | |
747 | ||
f62ed9e3 | 748 | edd_kset = kset_create_and_add("edd", NULL, firmware_kobj); |
9651d350 GKH |
749 | if (!edd_kset) |
750 | return -ENOMEM; | |
1da177e4 | 751 | |
1986aaf8 | 752 | for (i = 0; i < edd_num_devices(); i++) { |
9c215384 | 753 | edev = kzalloc(sizeof (*edev), GFP_KERNEL); |
1986aaf8 AL |
754 | if (!edev) { |
755 | rc = -ENOMEM; | |
756 | goto out; | |
757 | } | |
1da177e4 LT |
758 | |
759 | rc = edd_device_register(edev, i); | |
760 | if (rc) { | |
761 | kfree(edev); | |
1986aaf8 | 762 | goto out; |
1da177e4 LT |
763 | } |
764 | edd_devices[i] = edev; | |
765 | } | |
766 | ||
1986aaf8 AL |
767 | return 0; |
768 | ||
769 | out: | |
770 | while (--i >= 0) | |
771 | edd_device_unregister(edd_devices[i]); | |
772 | kset_unregister(edd_kset); | |
1da177e4 LT |
773 | return rc; |
774 | } | |
775 | ||
776 | static void __exit | |
777 | edd_exit(void) | |
778 | { | |
779 | int i; | |
780 | struct edd_device *edev; | |
781 | ||
782 | for (i = 0; i < edd_num_devices(); i++) { | |
783 | if ((edev = edd_devices[i])) | |
784 | edd_device_unregister(edev); | |
785 | } | |
9651d350 | 786 | kset_unregister(edd_kset); |
1da177e4 LT |
787 | } |
788 | ||
789 | late_initcall(edd_init); | |
790 | module_exit(edd_exit); |