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f0713480 KS |
1 | /* |
2 | * udev_sysfs.c - sysfs linux kernel specific knowledge | |
3 | * | |
4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> | |
5 | * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <stddef.h> | |
24 | #include <stdlib.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <ctype.h> | |
28 | #include <errno.h> | |
29 | #include <sys/stat.h> | |
30 | ||
31 | #include "logging.h" | |
32 | #include "udev_version.h" | |
33 | #include "udev_sysfs.h" | |
34 | #include "libsysfs/sysfs/libsysfs.h" | |
35 | ||
36 | /* list of subsystem specific files | |
37 | * NULL if there is no file to wait for | |
38 | */ | |
39 | static struct subsystem_file { | |
40 | char *subsystem; | |
41 | char *file; | |
42 | } subsystem_files[] = { | |
43 | { .subsystem = "net", .file = "ifindex" }, | |
44 | { .subsystem = "scsi_host", .file = "unique_id" }, | |
45 | { .subsystem = "scsi_device", .file = NULL }, | |
46 | { .subsystem = "pcmcia_socket", .file = "card_type" }, | |
47 | { .subsystem = "usb_host", .file = NULL }, | |
48 | { .subsystem = "bluetooth", .file = "address" }, | |
49 | { .subsystem = "firmware", .file = "data" }, | |
50 | { .subsystem = "i2c-adapter", .file = NULL }, | |
51 | { .subsystem = "pci_bus", .file = NULL }, | |
52 | { .subsystem = "ieee1394", .file = NULL }, | |
53 | { .subsystem = "ieee1394_host", .file = NULL }, | |
54 | { .subsystem = "ieee1394_node", .file = NULL }, | |
55 | { NULL, NULL } | |
56 | }; | |
57 | ||
58 | int subsystem_expect_no_dev(const char *subsystem) | |
59 | { | |
60 | struct subsystem_file *file; | |
61 | ||
62 | for (file = subsystem_files; file->subsystem != NULL; file++) | |
63 | if (strcmp(subsystem, file->subsystem) == 0) | |
64 | return 1; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | /* get subsystem specific files, returns "dev" if no other found */ | |
70 | static char *get_subsystem_specific_file(const char *subsystem) | |
71 | { | |
72 | struct subsystem_file *file; | |
73 | ||
74 | /* look if we want to look for another file instead of "dev" */ | |
75 | for (file = subsystem_files; file->subsystem != NULL; file++) | |
76 | if (strcmp(subsystem, file->subsystem) == 0) | |
77 | return file->file; | |
78 | ||
79 | return "dev"; | |
80 | } | |
81 | ||
82 | /* wait for class pecific file to show up */ | |
83 | static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev, | |
84 | const char **error) | |
85 | { | |
86 | const char *file; | |
87 | char filename[SYSFS_PATH_MAX]; | |
88 | int loop; | |
89 | ||
90 | file = get_subsystem_specific_file(class_dev->classname); | |
91 | if (file == NULL) { | |
92 | dbg("class '%s' has no file to wait for", class_dev->classname); | |
93 | return 0; | |
94 | } | |
95 | ||
1ad9a8c1 KS |
96 | snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", class_dev->path, file); |
97 | dbg("looking at class '%s' for specific file '%s'", class_dev->classname, filename); | |
f0713480 KS |
98 | |
99 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
100 | while (--loop) { | |
101 | struct stat stats; | |
102 | ||
103 | if (stat(class_dev->path, &stats) == -1) { | |
104 | dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path); | |
105 | return -ENODEV; | |
106 | } | |
107 | ||
108 | if (stat(filename, &stats) == 0) { | |
109 | dbg("class '%s' specific file '%s' found", class_dev->classname, file); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
114 | } | |
115 | ||
116 | dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file); | |
117 | if (error) | |
118 | *error = "class specific file unavailable"; | |
119 | return -ENOENT; | |
120 | } | |
121 | ||
122 | /* check if we need to wait for a physical device */ | |
123 | static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev) | |
124 | { | |
125 | /* list of devices without a "device" symlink to the physical device | |
126 | * if device is set to NULL, no devices in that subsystem has a link */ | |
127 | static struct class_device { | |
128 | char *subsystem; | |
129 | char *device; | |
130 | } class_device[] = { | |
131 | { .subsystem = "block", .device = "double" }, | |
132 | { .subsystem = "block", .device = "nb" }, | |
133 | { .subsystem = "block", .device = "ram" }, | |
134 | { .subsystem = "block", .device = "loop" }, | |
135 | { .subsystem = "block", .device = "fd" }, | |
136 | { .subsystem = "block", .device = "md" }, | |
137 | { .subsystem = "block", .device = "dos_cd" }, | |
138 | { .subsystem = "block", .device = "rflash" }, | |
139 | { .subsystem = "block", .device = "rom" }, | |
140 | { .subsystem = "block", .device = "rrom" }, | |
141 | { .subsystem = "block", .device = "flash" }, | |
142 | { .subsystem = "block", .device = "msd" }, | |
143 | { .subsystem = "block", .device = "sbpcd" }, | |
144 | { .subsystem = "block", .device = "pcd" }, | |
145 | { .subsystem = "block", .device = "pf" }, | |
146 | { .subsystem = "block", .device = "scd" }, | |
147 | { .subsystem = "block", .device = "ubd" }, | |
148 | { .subsystem = "block", .device = "dm-" }, | |
149 | { .subsystem = "input", .device = "event" }, | |
150 | { .subsystem = "input", .device = "mice" }, | |
151 | { .subsystem = "input", .device = "mouse" }, | |
152 | { .subsystem = "input", .device = "ts" }, | |
153 | { .subsystem = "vc", .device = NULL }, | |
154 | { .subsystem = "tty", .device = NULL }, | |
155 | { .subsystem = "cpuid", .device = "cpu" }, | |
156 | { .subsystem = "graphics", .device = "fb" }, | |
157 | { .subsystem = "mem", .device = NULL }, | |
158 | { .subsystem = "misc", .device = NULL }, | |
159 | { .subsystem = "msr", .device = NULL }, | |
160 | { .subsystem = "netlink", .device = NULL }, | |
161 | { .subsystem = "net", .device = "sit" }, | |
162 | { .subsystem = "net", .device = "lo" }, | |
163 | { .subsystem = "net", .device = "tap" }, | |
164 | { .subsystem = "net", .device = "ipsec" }, | |
165 | { .subsystem = "net", .device = "dummy" }, | |
166 | { .subsystem = "net", .device = "irda" }, | |
167 | { .subsystem = "net", .device = "ppp" }, | |
1ad9a8c1 | 168 | { .subsystem = "net", .device = "tun" }, |
21d2888a KS |
169 | { .subsystem = "net", .device = "pan" }, |
170 | { .subsystem = "net", .device = "bnep" }, | |
6628a2ea | 171 | { .subsystem = "net", .device = "vmnet" }, |
f0713480 KS |
172 | { .subsystem = "ppp", .device = NULL }, |
173 | { .subsystem = "sound", .device = NULL }, | |
174 | { .subsystem = "printer", .device = "lp" }, | |
175 | { .subsystem = "nvidia", .device = NULL }, | |
176 | { .subsystem = "video4linux", .device = "vbi" }, | |
56b979e0 | 177 | { .subsystem = "dvb", .device = NULL }, |
f0713480 KS |
178 | { .subsystem = "lirc", .device = NULL }, |
179 | { .subsystem = "firmware", .device = NULL }, | |
180 | { .subsystem = "drm", .device = NULL }, | |
181 | { .subsystem = "pci_bus", .device = NULL }, | |
182 | { .subsystem = "ieee1394", .device = NULL }, | |
183 | { .subsystem = "ieee1394_host", .device = NULL }, | |
184 | { .subsystem = "ieee1394_node", .device = NULL }, | |
185 | { .subsystem = "raw", .device = NULL }, | |
6628a2ea | 186 | { .subsystem = "zaptel", .device = NULL }, |
56b979e0 KS |
187 | { .subsystem = "tiglusb", .device = NULL }, |
188 | { .subsystem = "ppdev", .device = NULL }, | |
189 | { .subsystem = "ticables", .device = NULL }, | |
190 | { .subsystem = "snsc", .device = NULL }, | |
191 | { .subsystem = "staliomem", .device = NULL }, | |
192 | { .subsystem = "tape", .device = NULL }, | |
193 | { .subsystem = "ip2", .device = NULL }, | |
194 | { .subsystem = "tpqic02", .device = NULL }, | |
195 | { .subsystem = "dsp56k", .device = NULL }, | |
196 | { .subsystem = "zft", .device = NULL }, | |
197 | { .subsystem = "adb", .device = NULL }, | |
198 | { .subsystem = "cosa", .device = NULL }, | |
199 | { .subsystem = "pg", .device = NULL }, | |
200 | { .subsystem = "pt", .device = NULL }, | |
201 | { .subsystem = "capi", .device = NULL }, | |
f0713480 KS |
202 | { NULL, NULL } |
203 | }; | |
204 | struct class_device *classdevice; | |
205 | int len; | |
206 | ||
207 | for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) { | |
208 | if (strcmp(class_dev->classname, classdevice->subsystem) == 0) { | |
209 | /* see if no device in this class is expected to have a device-link */ | |
210 | if (classdevice->device == NULL) | |
211 | return 1; | |
212 | ||
213 | len = strlen(classdevice->device); | |
214 | ||
215 | /* see if device name matches */ | |
216 | if (strncmp(class_dev->name, classdevice->device, len) != 0) | |
217 | continue; | |
218 | ||
219 | /* exact name match */ | |
220 | if (strlen(class_dev->name) == len) | |
221 | return 1; | |
222 | ||
223 | /* name match with instance number */ | |
224 | if (isdigit(class_dev->name[len])) | |
225 | return 1; | |
226 | } | |
227 | } | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | /* skip waiting for the bus */ | |
233 | static int class_device_expect_no_bus(struct sysfs_class_device *class_dev) | |
234 | { | |
235 | static char *devices_without_bus[] = { | |
236 | "scsi_host", | |
237 | "i2c-adapter", | |
238 | NULL | |
239 | }; | |
240 | char **device; | |
241 | ||
242 | for (device = devices_without_bus; *device != NULL; device++) { | |
243 | int len = strlen(*device); | |
244 | ||
245 | if (strncmp(class_dev->classname, *device, len) == 0) | |
246 | return 1; | |
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /* wait for the bus and for a bus specific file to show up */ | |
253 | int wait_for_bus_device(struct sysfs_device *devices_dev, | |
254 | const char **error) | |
255 | { | |
256 | static struct bus_file { | |
257 | char *bus; | |
258 | char *file; | |
259 | } bus_files[] = { | |
260 | { .bus = "scsi", .file = "vendor" }, | |
261 | { .bus = "usb", .file = "idVendor" }, | |
262 | { .bus = "usb", .file = "iInterface" }, | |
263 | { .bus = "usb", .file = "bNumEndpoints" }, | |
264 | { .bus = "usb-serial", .file = "detach_state" }, | |
265 | { .bus = "ide", .file = "detach_state" }, | |
266 | { .bus = "pci", .file = "vendor" }, | |
267 | { .bus = "platform", .file = "detach_state" }, | |
268 | { .bus = "i2c", .file = "detach_state" }, | |
1ad9a8c1 KS |
269 | { .bus = "ieee1394", .file = "node_count" }, |
270 | { .bus = "ieee1394", .file = "nodeid" }, | |
271 | { .bus = "ieee1394", .file = "address" }, | |
272 | { NULL, NULL } | |
f0713480 KS |
273 | }; |
274 | struct bus_file *busfile; | |
275 | int loop; | |
276 | ||
277 | /* wait for the bus device link to the devices device */ | |
278 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
279 | while (--loop) { | |
280 | if (sysfs_get_device_bus(devices_dev) == 0) | |
281 | break; | |
282 | ||
283 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
284 | } | |
285 | if (loop == 0) { | |
286 | dbg("error: getting bus device link"); | |
287 | if (error) | |
288 | *error = "no bus device link"; | |
289 | return -1; | |
290 | } | |
291 | dbg("bus device link found for bus '%s'", devices_dev->bus); | |
292 | ||
293 | /* wait for a bus specific file to show up */ | |
294 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
295 | while (--loop) { | |
1ad9a8c1 | 296 | int found_bus_type = 0; |
f0713480 KS |
297 | |
298 | for (busfile = bus_files; busfile->bus != NULL; busfile++) { | |
299 | if (strcmp(devices_dev->bus, busfile->bus) == 0) { | |
1ad9a8c1 KS |
300 | char filename[SYSFS_PATH_MAX]; |
301 | struct stat stats; | |
302 | ||
303 | found_bus_type = 1; | |
304 | snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", devices_dev->path, busfile->file); | |
305 | dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, filename); | |
306 | ||
307 | if (stat(filename, &stats) == 0) { | |
f0713480 KS |
308 | dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file); |
309 | return 0; | |
310 | } | |
311 | } | |
312 | } | |
1ad9a8c1 | 313 | if (found_bus_type == 0) { |
f0713480 KS |
314 | if (error) |
315 | *error = "unknown bus"; | |
316 | info("error: unknown bus, please report to " | |
317 | "<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus); | |
318 | return -1; | |
319 | } | |
320 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
321 | } | |
322 | ||
323 | dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file); | |
324 | if (error) | |
325 | *error = "bus specific file unavailable"; | |
326 | return -1; | |
327 | } | |
328 | ||
329 | ||
330 | struct sysfs_class_device *open_class_device_wait(const char *path) | |
331 | { | |
332 | struct sysfs_class_device *class_dev; | |
333 | int loop; | |
334 | ||
335 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
336 | while (--loop) { | |
337 | class_dev = sysfs_open_class_device_path(path); | |
338 | if (class_dev) | |
339 | break; | |
340 | ||
341 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
342 | } | |
343 | ||
344 | return (class_dev); | |
345 | } | |
346 | ||
347 | int wait_for_class_device(struct sysfs_class_device *class_dev, | |
348 | const char **error) | |
349 | { | |
350 | struct sysfs_class_device *class_dev_parent; | |
351 | struct sysfs_device *devices_dev = NULL; | |
352 | int loop; | |
353 | ||
354 | if (wait_for_class_device_attributes(class_dev, error) != 0) | |
355 | return -ENOENT; | |
356 | ||
357 | /* skip devices without devices-link */ | |
358 | if (class_device_expect_no_device_link(class_dev)) { | |
359 | dbg("no device symlink expected for '%s', ", class_dev->name); | |
360 | return -ENODEV; | |
361 | } | |
362 | ||
363 | /* the symlink may be on the parent device */ | |
364 | class_dev_parent = sysfs_get_classdev_parent(class_dev); | |
365 | if (class_dev_parent) | |
366 | dbg("looking at parent device for device link '%s'", class_dev_parent->path); | |
367 | ||
368 | /* wait for the symlink to the devices device */ | |
369 | dbg("waiting for symlink to devices device"); | |
370 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
371 | while (--loop) { | |
372 | if (class_dev_parent) | |
373 | devices_dev = sysfs_get_classdev_device(class_dev_parent); | |
374 | else | |
375 | devices_dev = sysfs_get_classdev_device(class_dev); | |
376 | ||
377 | if (devices_dev) | |
378 | break; | |
379 | ||
380 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
381 | } | |
382 | if (!devices_dev) { | |
383 | dbg(" error: no devices device symlink found"); | |
384 | if (error) | |
385 | *error = "no device symlink"; | |
386 | return -ENODEV; | |
387 | } | |
388 | dbg("device symlink found pointing to '%s'", devices_dev->path); | |
389 | ||
390 | /* wait for the bus value */ | |
391 | if (class_device_expect_no_bus(class_dev)) { | |
392 | dbg("no bus device expected for '%s', ", class_dev->classname); | |
393 | return 0; | |
394 | } else { | |
395 | return wait_for_bus_device(devices_dev, error); | |
396 | } | |
397 | } | |
398 | ||
399 | struct sysfs_device *open_devices_device_wait(const char *path) | |
400 | { | |
401 | struct sysfs_device *devices_dev; | |
402 | int loop; | |
403 | ||
404 | loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; | |
405 | while (--loop) { | |
406 | devices_dev = sysfs_open_device_path(path); | |
407 | if (devices_dev) | |
408 | break; | |
409 | ||
410 | usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); | |
411 | } | |
412 | ||
413 | return(devices_dev); | |
414 | } |