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Commit | Line | Data |
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1da177e4 | 1 | /* |
7785925d | 2 | * w1.c |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
7785925d | 5 | * |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/delay.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/sched.h> | |
33 | ||
34 | #include <asm/atomic.h> | |
35 | ||
36 | #include "w1.h" | |
37 | #include "w1_io.h" | |
38 | #include "w1_log.h" | |
39 | #include "w1_int.h" | |
40 | #include "w1_family.h" | |
41 | #include "w1_netlink.h" | |
42 | ||
43 | MODULE_LICENSE("GPL"); | |
44 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); | |
45 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); | |
46 | ||
47 | static int w1_timeout = 10; | |
48 | int w1_max_slave_count = 10; | |
49 | int w1_max_slave_ttl = 10; | |
50 | ||
51 | module_param_named(timeout, w1_timeout, int, 0); | |
52 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); | |
53 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); | |
54 | ||
55 | DEFINE_SPINLOCK(w1_mlock); | |
56 | LIST_HEAD(w1_masters); | |
57 | ||
58 | static pid_t control_thread; | |
59 | static int control_needs_exit; | |
60 | static DECLARE_COMPLETION(w1_control_complete); | |
61 | ||
62 | static int w1_master_match(struct device *dev, struct device_driver *drv) | |
63 | { | |
64 | return 1; | |
65 | } | |
66 | ||
67 | static int w1_master_probe(struct device *dev) | |
68 | { | |
69 | return -ENODEV; | |
70 | } | |
71 | ||
72 | static int w1_master_remove(struct device *dev) | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void w1_master_release(struct device *dev) | |
78 | { | |
79 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
80 | ||
81 | complete(&md->dev_released); | |
82 | } | |
83 | ||
84 | static void w1_slave_release(struct device *dev) | |
85 | { | |
86 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
87 | ||
88 | complete(&sl->dev_released); | |
89 | } | |
90 | ||
060b8845 | 91 | static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
92 | { |
93 | return sprintf(buf, "No family registered.\n"); | |
94 | } | |
95 | ||
96 | static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off, | |
97 | size_t count) | |
98 | { | |
99 | return sprintf(buf, "No family registered.\n"); | |
100 | } | |
101 | ||
7785925d EP |
102 | static struct device_attribute w1_slave_attribute = |
103 | __ATTR(name, S_IRUGO, w1_default_read_name, NULL); | |
104 | ||
7785925d EP |
105 | static struct bin_attribute w1_slave_bin_attribute = { |
106 | .attr = { | |
107 | .name = "w1_slave", | |
108 | .mode = S_IRUGO, | |
109 | .owner = THIS_MODULE, | |
110 | }, | |
111 | .size = W1_SLAVE_DATA_SIZE, | |
112 | .read = &w1_default_read_bin, | |
113 | }; | |
114 | ||
115 | ||
1da177e4 LT |
116 | static struct bus_type w1_bus_type = { |
117 | .name = "w1", | |
118 | .match = w1_master_match, | |
119 | }; | |
120 | ||
121 | struct device_driver w1_driver = { | |
122 | .name = "w1_driver", | |
123 | .bus = &w1_bus_type, | |
124 | .probe = w1_master_probe, | |
125 | .remove = w1_master_remove, | |
126 | }; | |
127 | ||
128 | struct device w1_device = { | |
129 | .parent = NULL, | |
130 | .bus = &w1_bus_type, | |
131 | .bus_id = "w1 bus master", | |
132 | .driver = &w1_driver, | |
133 | .release = &w1_master_release | |
134 | }; | |
135 | ||
060b8845 | 136 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 137 | { |
6b729861 | 138 | struct w1_master *md = container_of(dev, struct w1_master, dev); |
1da177e4 | 139 | ssize_t count; |
7785925d | 140 | |
1da177e4 LT |
141 | if (down_interruptible (&md->mutex)) |
142 | return -EBUSY; | |
143 | ||
144 | count = sprintf(buf, "%s\n", md->name); | |
7785925d | 145 | |
1da177e4 LT |
146 | up(&md->mutex); |
147 | ||
148 | return count; | |
149 | } | |
150 | ||
060b8845 | 151 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
152 | { |
153 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
154 | ssize_t count; | |
7785925d | 155 | |
1da177e4 LT |
156 | if (down_interruptible(&md->mutex)) |
157 | return -EBUSY; | |
158 | ||
159 | count = sprintf(buf, "0x%p\n", md->bus_master); | |
7785925d | 160 | |
1da177e4 LT |
161 | up(&md->mutex); |
162 | return count; | |
163 | } | |
164 | ||
060b8845 | 165 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
166 | { |
167 | ssize_t count; | |
168 | count = sprintf(buf, "%d\n", w1_timeout); | |
169 | return count; | |
170 | } | |
171 | ||
060b8845 | 172 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
173 | { |
174 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
175 | ssize_t count; | |
7785925d | 176 | |
1da177e4 LT |
177 | if (down_interruptible(&md->mutex)) |
178 | return -EBUSY; | |
179 | ||
180 | count = sprintf(buf, "%d\n", md->max_slave_count); | |
7785925d | 181 | |
1da177e4 LT |
182 | up(&md->mutex); |
183 | return count; | |
184 | } | |
185 | ||
060b8845 | 186 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
187 | { |
188 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
189 | ssize_t count; | |
7785925d | 190 | |
1da177e4 LT |
191 | if (down_interruptible(&md->mutex)) |
192 | return -EBUSY; | |
193 | ||
194 | count = sprintf(buf, "%lu\n", md->attempts); | |
7785925d | 195 | |
1da177e4 LT |
196 | up(&md->mutex); |
197 | return count; | |
198 | } | |
199 | ||
060b8845 | 200 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
201 | { |
202 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
203 | ssize_t count; | |
7785925d | 204 | |
1da177e4 LT |
205 | if (down_interruptible(&md->mutex)) |
206 | return -EBUSY; | |
207 | ||
208 | count = sprintf(buf, "%d\n", md->slave_count); | |
7785925d | 209 | |
1da177e4 LT |
210 | up(&md->mutex); |
211 | return count; | |
212 | } | |
213 | ||
060b8845 | 214 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
215 | { |
216 | struct w1_master *md = container_of(dev, struct w1_master, dev); | |
217 | int c = PAGE_SIZE; | |
218 | ||
219 | if (down_interruptible(&md->mutex)) | |
220 | return -EBUSY; | |
221 | ||
222 | if (md->slave_count == 0) | |
223 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); | |
224 | else { | |
225 | struct list_head *ent, *n; | |
226 | struct w1_slave *sl; | |
227 | ||
228 | list_for_each_safe(ent, n, &md->slist) { | |
229 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
230 | ||
7785925d | 231 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
1da177e4 LT |
232 | } |
233 | } | |
234 | ||
235 | up(&md->mutex); | |
236 | ||
237 | return PAGE_SIZE - c; | |
238 | } | |
239 | ||
7785925d EP |
240 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
241 | struct device_attribute w1_master_attribute_##_name = \ | |
242 | __ATTR(w1_master_##_name, _mode, \ | |
243 | w1_master_attribute_show_##_name, NULL) | |
244 | ||
245 | static W1_MASTER_ATTR_RO(name, S_IRUGO); | |
246 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); | |
247 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); | |
248 | static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); | |
249 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); | |
250 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); | |
251 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); | |
252 | ||
253 | static struct attribute *w1_master_default_attrs[] = { | |
254 | &w1_master_attribute_name.attr, | |
255 | &w1_master_attribute_slaves.attr, | |
256 | &w1_master_attribute_slave_count.attr, | |
257 | &w1_master_attribute_max_slave_count.attr, | |
258 | &w1_master_attribute_attempts.attr, | |
259 | &w1_master_attribute_timeout.attr, | |
260 | &w1_master_attribute_pointer.attr, | |
261 | NULL | |
1da177e4 LT |
262 | }; |
263 | ||
7785925d EP |
264 | static struct attribute_group w1_master_defattr_group = { |
265 | .attrs = w1_master_default_attrs, | |
1da177e4 LT |
266 | }; |
267 | ||
7785925d EP |
268 | int w1_create_master_attributes(struct w1_master *master) |
269 | { | |
270 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); | |
271 | } | |
272 | ||
273 | void w1_destroy_master_attributes(struct w1_master *master) | |
274 | { | |
275 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); | |
276 | } | |
277 | ||
1da177e4 LT |
278 | static int __w1_attach_slave_device(struct w1_slave *sl) |
279 | { | |
280 | int err; | |
281 | ||
282 | sl->dev.parent = &sl->master->dev; | |
283 | sl->dev.driver = sl->master->driver; | |
284 | sl->dev.bus = &w1_bus_type; | |
285 | sl->dev.release = &w1_slave_release; | |
286 | ||
287 | snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), | |
6b729861 EP |
288 | "%02x-%012llx", |
289 | (unsigned int) sl->reg_num.family, | |
290 | (unsigned long long) sl->reg_num.id); | |
291 | snprintf(&sl->name[0], sizeof(sl->name), | |
292 | "%02x-%012llx", | |
293 | (unsigned int) sl->reg_num.family, | |
294 | (unsigned long long) sl->reg_num.id); | |
1da177e4 LT |
295 | |
296 | dev_dbg(&sl->dev, "%s: registering %s.\n", __func__, | |
297 | &sl->dev.bus_id[0]); | |
298 | ||
299 | err = device_register(&sl->dev); | |
300 | if (err < 0) { | |
301 | dev_err(&sl->dev, | |
6b729861 EP |
302 | "Device registration [%s] failed. err=%d\n", |
303 | sl->dev.bus_id, err); | |
1da177e4 LT |
304 | return err; |
305 | } | |
306 | ||
307 | memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin)); | |
308 | memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name)); | |
7785925d | 309 | |
1da177e4 LT |
310 | sl->attr_bin.read = sl->family->fops->rbin; |
311 | sl->attr_name.show = sl->family->fops->rname; | |
1da177e4 LT |
312 | |
313 | err = device_create_file(&sl->dev, &sl->attr_name); | |
314 | if (err < 0) { | |
315 | dev_err(&sl->dev, | |
6b729861 EP |
316 | "sysfs file creation for [%s] failed. err=%d\n", |
317 | sl->dev.bus_id, err); | |
1da177e4 LT |
318 | device_unregister(&sl->dev); |
319 | return err; | |
320 | } | |
321 | ||
1da177e4 LT |
322 | err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin); |
323 | if (err < 0) { | |
324 | dev_err(&sl->dev, | |
6b729861 EP |
325 | "sysfs file creation for [%s] failed. err=%d\n", |
326 | sl->dev.bus_id, err); | |
1da177e4 | 327 | device_remove_file(&sl->dev, &sl->attr_name); |
1da177e4 LT |
328 | device_unregister(&sl->dev); |
329 | return err; | |
330 | } | |
331 | ||
332 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) | |
338 | { | |
339 | struct w1_slave *sl; | |
340 | struct w1_family *f; | |
341 | int err; | |
342 | struct w1_netlink_msg msg; | |
343 | ||
344 | sl = kmalloc(sizeof(struct w1_slave), GFP_KERNEL); | |
345 | if (!sl) { | |
346 | dev_err(&dev->dev, | |
347 | "%s: failed to allocate new slave device.\n", | |
348 | __func__); | |
349 | return -ENOMEM; | |
350 | } | |
351 | ||
352 | memset(sl, 0, sizeof(*sl)); | |
353 | ||
354 | sl->owner = THIS_MODULE; | |
355 | sl->master = dev; | |
356 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
357 | ||
358 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); | |
359 | atomic_set(&sl->refcnt, 0); | |
360 | init_completion(&sl->dev_released); | |
361 | ||
362 | spin_lock(&w1_flock); | |
363 | f = w1_family_registered(rn->family); | |
364 | if (!f) { | |
365 | spin_unlock(&w1_flock); | |
366 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", | |
367 | rn->family, rn->family, | |
368 | (unsigned long long)rn->id, rn->crc); | |
369 | kfree(sl); | |
370 | return -ENODEV; | |
371 | } | |
372 | __w1_family_get(f); | |
373 | spin_unlock(&w1_flock); | |
374 | ||
375 | sl->family = f; | |
376 | ||
377 | ||
378 | err = __w1_attach_slave_device(sl); | |
379 | if (err < 0) { | |
380 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, | |
381 | sl->name); | |
382 | w1_family_put(sl->family); | |
383 | kfree(sl); | |
384 | return err; | |
385 | } | |
386 | ||
387 | sl->ttl = dev->slave_ttl; | |
388 | dev->slave_count++; | |
389 | ||
390 | memcpy(&msg.id.id, rn, sizeof(msg.id.id)); | |
391 | msg.type = W1_SLAVE_ADD; | |
392 | w1_netlink_send(dev, &msg); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | static void w1_slave_detach(struct w1_slave *sl) | |
398 | { | |
399 | struct w1_netlink_msg msg; | |
7785925d | 400 | |
1da177e4 LT |
401 | dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name); |
402 | ||
403 | while (atomic_read(&sl->refcnt)) { | |
404 | printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", | |
405 | sl->name, atomic_read(&sl->refcnt)); | |
406 | ||
407 | if (msleep_interruptible(1000)) | |
408 | flush_signals(current); | |
409 | } | |
410 | ||
411 | sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin); | |
412 | device_remove_file(&sl->dev, &sl->attr_name); | |
1da177e4 LT |
413 | device_unregister(&sl->dev); |
414 | w1_family_put(sl->family); | |
415 | ||
416 | memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); | |
417 | msg.type = W1_SLAVE_REMOVE; | |
418 | w1_netlink_send(sl->master, &msg); | |
419 | } | |
420 | ||
421 | static struct w1_master *w1_search_master(unsigned long data) | |
422 | { | |
423 | struct w1_master *dev; | |
424 | int found = 0; | |
7785925d EP |
425 | |
426 | spin_lock_bh(&w1_mlock); | |
1da177e4 LT |
427 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
428 | if (dev->bus_master->data == data) { | |
429 | found = 1; | |
430 | atomic_inc(&dev->refcnt); | |
431 | break; | |
432 | } | |
433 | } | |
7785925d | 434 | spin_unlock_bh(&w1_mlock); |
1da177e4 LT |
435 | |
436 | return (found)?dev:NULL; | |
437 | } | |
438 | ||
7785925d | 439 | static void w1_slave_found(unsigned long data, u64 rn) |
1da177e4 LT |
440 | { |
441 | int slave_count; | |
442 | struct w1_slave *sl; | |
443 | struct list_head *ent; | |
444 | struct w1_reg_num *tmp; | |
445 | int family_found = 0; | |
446 | struct w1_master *dev; | |
447 | ||
448 | dev = w1_search_master(data); | |
449 | if (!dev) { | |
450 | printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n", | |
451 | data); | |
452 | return; | |
453 | } | |
7785925d | 454 | |
1da177e4 LT |
455 | tmp = (struct w1_reg_num *) &rn; |
456 | ||
457 | slave_count = 0; | |
458 | list_for_each(ent, &dev->slist) { | |
459 | ||
460 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); | |
461 | ||
462 | if (sl->reg_num.family == tmp->family && | |
463 | sl->reg_num.id == tmp->id && | |
464 | sl->reg_num.crc == tmp->crc) { | |
465 | set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); | |
466 | break; | |
7785925d | 467 | } else if (sl->reg_num.family == tmp->family) { |
1da177e4 LT |
468 | family_found = 1; |
469 | break; | |
470 | } | |
471 | ||
472 | slave_count++; | |
473 | } | |
474 | ||
8523ff45 EP |
475 | rn = cpu_to_le64(rn); |
476 | ||
477 | if (slave_count == dev->slave_count && | |
478 | rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) { | |
479 | w1_attach_slave_device(dev, tmp); | |
1da177e4 | 480 | } |
7785925d | 481 | |
1da177e4 LT |
482 | atomic_dec(&dev->refcnt); |
483 | } | |
484 | ||
6b729861 EP |
485 | /** |
486 | * Performs a ROM Search & registers any devices found. | |
487 | * The 1-wire search is a simple binary tree search. | |
488 | * For each bit of the address, we read two bits and write one bit. | |
489 | * The bit written will put to sleep all devies that don't match that bit. | |
490 | * When the two reads differ, the direction choice is obvious. | |
491 | * When both bits are 0, we must choose a path to take. | |
492 | * When we can scan all 64 bits without having to choose a path, we are done. | |
493 | * | |
494 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com | |
495 | * | |
496 | * @dev The master device to search | |
497 | * @cb Function to call when a device is found | |
498 | */ | |
499 | void w1_search(struct w1_master *dev, w1_slave_found_callback cb) | |
1da177e4 | 500 | { |
6b729861 EP |
501 | u64 last_rn, rn, tmp64; |
502 | int i, slave_count = 0; | |
503 | int last_zero, last_device; | |
504 | int search_bit, desc_bit; | |
505 | u8 triplet_ret = 0; | |
1da177e4 | 506 | |
6b729861 EP |
507 | search_bit = 0; |
508 | rn = last_rn = 0; | |
509 | last_device = 0; | |
510 | last_zero = -1; | |
1da177e4 LT |
511 | |
512 | desc_bit = 64; | |
513 | ||
6b729861 EP |
514 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
515 | last_rn = rn; | |
1da177e4 LT |
516 | rn = 0; |
517 | ||
1da177e4 LT |
518 | /* |
519 | * Reset bus and all 1-wire device state machines | |
520 | * so they can respond to our requests. | |
521 | * | |
522 | * Return 0 - device(s) present, 1 - no devices present. | |
523 | */ | |
524 | if (w1_reset_bus(dev)) { | |
525 | dev_info(&dev->dev, "No devices present on the wire.\n"); | |
526 | break; | |
527 | } | |
528 | ||
6b729861 | 529 | /* Start the search */ |
1da177e4 LT |
530 | w1_write_8(dev, W1_SEARCH); |
531 | for (i = 0; i < 64; ++i) { | |
6b729861 EP |
532 | /* Determine the direction/search bit */ |
533 | if (i == desc_bit) | |
534 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ | |
535 | else if (i > desc_bit) | |
536 | search_bit = 0; /* take the 0 path on the next branch */ | |
1da177e4 | 537 | else |
6b729861 | 538 | search_bit = ((last_rn >> i) & 0x1); |
1da177e4 | 539 | |
6b729861 EP |
540 | /** Read two bits and write one bit */ |
541 | triplet_ret = w1_triplet(dev, search_bit); | |
542 | ||
543 | /* quit if no device responded */ | |
544 | if ( (triplet_ret & 0x03) == 0x03 ) | |
545 | break; | |
1da177e4 | 546 | |
6b729861 EP |
547 | /* If both directions were valid, and we took the 0 path... */ |
548 | if (triplet_ret == 0) | |
549 | last_zero = i; | |
1da177e4 | 550 | |
6b729861 EP |
551 | /* extract the direction taken & update the device number */ |
552 | tmp64 = (triplet_ret >> 2); | |
553 | rn |= (tmp64 << i); | |
554 | } | |
7785925d | 555 | |
6b729861 EP |
556 | if ( (triplet_ret & 0x03) != 0x03 ) { |
557 | if ( (desc_bit == last_zero) || (last_zero < 0)) | |
558 | last_device = 1; | |
559 | desc_bit = last_zero; | |
560 | cb(dev->bus_master->data, rn); | |
561 | } | |
1da177e4 LT |
562 | } |
563 | } | |
564 | ||
7785925d | 565 | static int w1_control(void *data) |
1da177e4 | 566 | { |
7785925d EP |
567 | struct w1_slave *sl, *sln; |
568 | struct w1_master *dev, *n; | |
1da177e4 LT |
569 | int err, have_to_wait = 0; |
570 | ||
571 | daemonize("w1_control"); | |
572 | allow_signal(SIGTERM); | |
573 | ||
574 | while (!control_needs_exit || have_to_wait) { | |
575 | have_to_wait = 0; | |
576 | ||
577 | try_to_freeze(PF_FREEZE); | |
578 | msleep_interruptible(w1_timeout * 1000); | |
579 | ||
580 | if (signal_pending(current)) | |
581 | flush_signals(current); | |
582 | ||
7785925d | 583 | list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { |
1da177e4 LT |
584 | if (!control_needs_exit && !dev->need_exit) |
585 | continue; | |
586 | /* | |
587 | * Little race: we can create thread but not set the flag. | |
588 | * Get a chance for external process to set flag up. | |
589 | */ | |
590 | if (!dev->initialized) { | |
591 | have_to_wait = 1; | |
592 | continue; | |
593 | } | |
594 | ||
7785925d | 595 | spin_lock_bh(&w1_mlock); |
1da177e4 | 596 | list_del(&dev->w1_master_entry); |
7785925d | 597 | spin_unlock_bh(&w1_mlock); |
1da177e4 LT |
598 | |
599 | if (control_needs_exit) { | |
600 | dev->need_exit = 1; | |
601 | ||
602 | err = kill_proc(dev->kpid, SIGTERM, 1); | |
603 | if (err) | |
604 | dev_err(&dev->dev, | |
605 | "Failed to send signal to w1 kernel thread %d.\n", | |
606 | dev->kpid); | |
607 | } | |
608 | ||
609 | wait_for_completion(&dev->dev_exited); | |
610 | ||
7785925d EP |
611 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
612 | list_del(&sl->w1_slave_entry); | |
1da177e4 | 613 | |
7785925d EP |
614 | w1_slave_detach(sl); |
615 | kfree(sl); | |
1da177e4 LT |
616 | } |
617 | w1_destroy_master_attributes(dev); | |
618 | atomic_dec(&dev->refcnt); | |
619 | } | |
620 | } | |
621 | ||
622 | complete_and_exit(&w1_control_complete, 0); | |
623 | } | |
624 | ||
625 | int w1_process(void *data) | |
626 | { | |
627 | struct w1_master *dev = (struct w1_master *) data; | |
7785925d | 628 | struct w1_slave *sl, *sln; |
1da177e4 LT |
629 | |
630 | daemonize("%s", dev->name); | |
631 | allow_signal(SIGTERM); | |
632 | ||
633 | while (!dev->need_exit) { | |
634 | try_to_freeze(PF_FREEZE); | |
635 | msleep_interruptible(w1_timeout * 1000); | |
636 | ||
637 | if (signal_pending(current)) | |
638 | flush_signals(current); | |
639 | ||
640 | if (dev->need_exit) | |
641 | break; | |
642 | ||
643 | if (!dev->initialized) | |
644 | continue; | |
645 | ||
646 | if (down_interruptible(&dev->mutex)) | |
647 | continue; | |
648 | ||
7785925d | 649 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
1da177e4 | 650 | clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
1da177e4 | 651 | |
7785925d | 652 | w1_search_devices(dev, w1_slave_found); |
1da177e4 | 653 | |
7785925d EP |
654 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
655 | if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { | |
1da177e4 LT |
656 | list_del (&sl->w1_slave_entry); |
657 | ||
658 | w1_slave_detach (sl); | |
659 | kfree (sl); | |
660 | ||
661 | dev->slave_count--; | |
7785925d | 662 | } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
1da177e4 LT |
663 | sl->ttl = dev->slave_ttl; |
664 | } | |
665 | up(&dev->mutex); | |
666 | } | |
667 | ||
668 | atomic_dec(&dev->refcnt); | |
669 | complete_and_exit(&dev->dev_exited, 0); | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
7785925d | 674 | static int w1_init(void) |
1da177e4 LT |
675 | { |
676 | int retval; | |
677 | ||
678 | printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n"); | |
679 | ||
680 | retval = bus_register(&w1_bus_type); | |
681 | if (retval) { | |
682 | printk(KERN_ERR "Failed to register bus. err=%d.\n", retval); | |
683 | goto err_out_exit_init; | |
684 | } | |
685 | ||
686 | retval = driver_register(&w1_driver); | |
687 | if (retval) { | |
688 | printk(KERN_ERR | |
689 | "Failed to register master driver. err=%d.\n", | |
690 | retval); | |
691 | goto err_out_bus_unregister; | |
692 | } | |
693 | ||
694 | control_thread = kernel_thread(&w1_control, NULL, 0); | |
695 | if (control_thread < 0) { | |
696 | printk(KERN_ERR "Failed to create control thread. err=%d\n", | |
697 | control_thread); | |
698 | retval = control_thread; | |
699 | goto err_out_driver_unregister; | |
700 | } | |
701 | ||
702 | return 0; | |
703 | ||
704 | err_out_driver_unregister: | |
705 | driver_unregister(&w1_driver); | |
706 | ||
707 | err_out_bus_unregister: | |
708 | bus_unregister(&w1_bus_type); | |
709 | ||
710 | err_out_exit_init: | |
711 | return retval; | |
712 | } | |
713 | ||
7785925d | 714 | static void w1_fini(void) |
1da177e4 LT |
715 | { |
716 | struct w1_master *dev; | |
1da177e4 | 717 | |
7785925d | 718 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4 | 719 | __w1_remove_master_device(dev); |
1da177e4 LT |
720 | |
721 | control_needs_exit = 1; | |
1da177e4 LT |
722 | wait_for_completion(&w1_control_complete); |
723 | ||
724 | driver_unregister(&w1_driver); | |
725 | bus_unregister(&w1_bus_type); | |
726 | } | |
727 | ||
728 | module_init(w1_init); | |
729 | module_exit(w1_fini); |