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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [base/] [sys.c] - Blame information for rev 78

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1 62 marcus.erl
/*
2
 * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc)
3
 *
4
 * Copyright (c) 2002-3 Patrick Mochel
5
 *               2002-3 Open Source Development Lab
6
 *
7
 * This file is released under the GPLv2
8
 *
9
 * This exports a 'system' bus type.
10
 * By default, a 'sys' bus gets added to the root of the system. There will
11
 * always be core system devices. Devices can use sysdev_register() to
12
 * add themselves as children of the system bus.
13
 */
14
 
15
#include <linux/sysdev.h>
16
#include <linux/err.h>
17
#include <linux/module.h>
18
#include <linux/kernel.h>
19
#include <linux/init.h>
20
#include <linux/slab.h>
21
#include <linux/string.h>
22
#include <linux/pm.h>
23
#include <linux/device.h>
24
#include <linux/mutex.h>
25
 
26
#include "base.h"
27
 
28
extern struct kset devices_subsys;
29
 
30
#define to_sysdev(k) container_of(k, struct sys_device, kobj)
31
#define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr)
32
 
33
 
34
static ssize_t
35
sysdev_show(struct kobject * kobj, struct attribute * attr, char * buffer)
36
{
37
        struct sys_device * sysdev = to_sysdev(kobj);
38
        struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
39
 
40
        if (sysdev_attr->show)
41
                return sysdev_attr->show(sysdev, buffer);
42
        return -EIO;
43
}
44
 
45
 
46
static ssize_t
47
sysdev_store(struct kobject * kobj, struct attribute * attr,
48
             const char * buffer, size_t count)
49
{
50
        struct sys_device * sysdev = to_sysdev(kobj);
51
        struct sysdev_attribute * sysdev_attr = to_sysdev_attr(attr);
52
 
53
        if (sysdev_attr->store)
54
                return sysdev_attr->store(sysdev, buffer, count);
55
        return -EIO;
56
}
57
 
58
static struct sysfs_ops sysfs_ops = {
59
        .show   = sysdev_show,
60
        .store  = sysdev_store,
61
};
62
 
63
static struct kobj_type ktype_sysdev = {
64
        .sysfs_ops      = &sysfs_ops,
65
};
66
 
67
 
68
int sysdev_create_file(struct sys_device * s, struct sysdev_attribute * a)
69
{
70
        return sysfs_create_file(&s->kobj, &a->attr);
71
}
72
 
73
 
74
void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
75
{
76
        sysfs_remove_file(&s->kobj, &a->attr);
77
}
78
 
79
EXPORT_SYMBOL_GPL(sysdev_create_file);
80
EXPORT_SYMBOL_GPL(sysdev_remove_file);
81
 
82
#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
83
#define to_sysdev_class_attr(a) container_of(a, \
84
        struct sysdev_class_attribute, attr)
85
 
86
static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
87
                                 char *buffer)
88
{
89
        struct sysdev_class * class = to_sysdev_class(kobj);
90
        struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
91
 
92
        if (class_attr->show)
93
                return class_attr->show(class, buffer);
94
        return -EIO;
95
}
96
 
97
static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
98
                                  const char *buffer, size_t count)
99
{
100
        struct sysdev_class * class = to_sysdev_class(kobj);
101
        struct sysdev_class_attribute * class_attr = to_sysdev_class_attr(attr);
102
 
103
        if (class_attr->store)
104
                return class_attr->store(class, buffer, count);
105
        return -EIO;
106
}
107
 
108
static struct sysfs_ops sysfs_class_ops = {
109
        .show   = sysdev_class_show,
110
        .store  = sysdev_class_store,
111
};
112
 
113
static struct kobj_type ktype_sysdev_class = {
114
        .sysfs_ops      = &sysfs_class_ops,
115
};
116
 
117
int sysdev_class_create_file(struct sysdev_class *c,
118
                             struct sysdev_class_attribute *a)
119
{
120
        return sysfs_create_file(&c->kset.kobj, &a->attr);
121
}
122
EXPORT_SYMBOL_GPL(sysdev_class_create_file);
123
 
124
void sysdev_class_remove_file(struct sysdev_class *c,
125
                              struct sysdev_class_attribute *a)
126
{
127
        sysfs_remove_file(&c->kset.kobj, &a->attr);
128
}
129
EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
130
 
131
/*
132
 * declare system_subsys
133
 */
134
static decl_subsys(system, &ktype_sysdev_class, NULL);
135
 
136
int sysdev_class_register(struct sysdev_class * cls)
137
{
138
        pr_debug("Registering sysdev class '%s'\n",
139
                 kobject_name(&cls->kset.kobj));
140
        INIT_LIST_HEAD(&cls->drivers);
141
        cls->kset.kobj.parent = &system_subsys.kobj;
142
        cls->kset.kobj.kset = &system_subsys;
143
        return kset_register(&cls->kset);
144
}
145
 
146
void sysdev_class_unregister(struct sysdev_class * cls)
147
{
148
        pr_debug("Unregistering sysdev class '%s'\n",
149
                 kobject_name(&cls->kset.kobj));
150
        kset_unregister(&cls->kset);
151
}
152
 
153
EXPORT_SYMBOL_GPL(sysdev_class_register);
154
EXPORT_SYMBOL_GPL(sysdev_class_unregister);
155
 
156
static DEFINE_MUTEX(sysdev_drivers_lock);
157
 
158
/**
159
 *      sysdev_driver_register - Register auxillary driver
160
 *      @cls:   Device class driver belongs to.
161
 *      @drv:   Driver.
162
 *
163
 *      @drv is inserted into @cls->drivers to be
164
 *      called on each operation on devices of that class. The refcount
165
 *      of @cls is incremented.
166
 */
167
 
168
int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
169
{
170
        int err = 0;
171
 
172
        mutex_lock(&sysdev_drivers_lock);
173
        if (cls && kset_get(&cls->kset)) {
174
                list_add_tail(&drv->entry, &cls->drivers);
175
 
176
                /* If devices of this class already exist, tell the driver */
177
                if (drv->add) {
178
                        struct sys_device *dev;
179
                        list_for_each_entry(dev, &cls->kset.list, kobj.entry)
180
                                drv->add(dev);
181
                }
182
        } else {
183
                err = -EINVAL;
184
                printk(KERN_ERR "%s: invalid device class\n", __FUNCTION__);
185
                WARN_ON(1);
186
        }
187
        mutex_unlock(&sysdev_drivers_lock);
188
        return err;
189
}
190
 
191
 
192
/**
193
 *      sysdev_driver_unregister - Remove an auxillary driver.
194
 *      @cls:   Class driver belongs to.
195
 *      @drv:   Driver.
196
 */
197
void sysdev_driver_unregister(struct sysdev_class * cls,
198
                              struct sysdev_driver * drv)
199
{
200
        mutex_lock(&sysdev_drivers_lock);
201
        list_del_init(&drv->entry);
202
        if (cls) {
203
                if (drv->remove) {
204
                        struct sys_device *dev;
205
                        list_for_each_entry(dev, &cls->kset.list, kobj.entry)
206
                                drv->remove(dev);
207
                }
208
                kset_put(&cls->kset);
209
        }
210
        mutex_unlock(&sysdev_drivers_lock);
211
}
212
 
213
EXPORT_SYMBOL_GPL(sysdev_driver_register);
214
EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
215
 
216
 
217
 
218
/**
219
 *      sysdev_register - add a system device to the tree
220
 *      @sysdev:        device in question
221
 *
222
 */
223
int sysdev_register(struct sys_device * sysdev)
224
{
225
        int error;
226
        struct sysdev_class * cls = sysdev->cls;
227
 
228
        if (!cls)
229
                return -EINVAL;
230
 
231
        /* Make sure the kset is set */
232
        sysdev->kobj.kset = &cls->kset;
233
 
234
        /* But make sure we point to the right type for sysfs translation */
235
        sysdev->kobj.ktype = &ktype_sysdev;
236
        error = kobject_set_name(&sysdev->kobj, "%s%d",
237
                         kobject_name(&cls->kset.kobj), sysdev->id);
238
        if (error)
239
                return error;
240
 
241
        pr_debug("Registering sys device '%s'\n", kobject_name(&sysdev->kobj));
242
 
243
        /* Register the object */
244
        error = kobject_register(&sysdev->kobj);
245
 
246
        if (!error) {
247
                struct sysdev_driver * drv;
248
 
249
                mutex_lock(&sysdev_drivers_lock);
250
                /* Generic notification is implicit, because it's that
251
                 * code that should have called us.
252
                 */
253
 
254
                /* Notify class auxillary drivers */
255
                list_for_each_entry(drv, &cls->drivers, entry) {
256
                        if (drv->add)
257
                                drv->add(sysdev);
258
                }
259
                mutex_unlock(&sysdev_drivers_lock);
260
        }
261
        return error;
262
}
263
 
264
void sysdev_unregister(struct sys_device * sysdev)
265
{
266
        struct sysdev_driver * drv;
267
 
268
        mutex_lock(&sysdev_drivers_lock);
269
        list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
270
                if (drv->remove)
271
                        drv->remove(sysdev);
272
        }
273
        mutex_unlock(&sysdev_drivers_lock);
274
 
275
        kobject_unregister(&sysdev->kobj);
276
}
277
 
278
 
279
 
280
/**
281
 *      sysdev_shutdown - Shut down all system devices.
282
 *
283
 *      Loop over each class of system devices, and the devices in each
284
 *      of those classes. For each device, we call the shutdown method for
285
 *      each driver registered for the device - the auxillaries,
286
 *      and the class driver.
287
 *
288
 *      Note: The list is iterated in reverse order, so that we shut down
289
 *      child devices before we shut down thier parents. The list ordering
290
 *      is guaranteed by virtue of the fact that child devices are registered
291
 *      after their parents.
292
 */
293
 
294
void sysdev_shutdown(void)
295
{
296
        struct sysdev_class * cls;
297
 
298
        pr_debug("Shutting Down System Devices\n");
299
 
300
        mutex_lock(&sysdev_drivers_lock);
301
        list_for_each_entry_reverse(cls, &system_subsys.list,
302
                                    kset.kobj.entry) {
303
                struct sys_device * sysdev;
304
 
305
                pr_debug("Shutting down type '%s':\n",
306
                         kobject_name(&cls->kset.kobj));
307
 
308
                list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
309
                        struct sysdev_driver * drv;
310
                        pr_debug(" %s\n", kobject_name(&sysdev->kobj));
311
 
312
                        /* Call auxillary drivers first */
313
                        list_for_each_entry(drv, &cls->drivers, entry) {
314
                                if (drv->shutdown)
315
                                        drv->shutdown(sysdev);
316
                        }
317
 
318
                        /* Now call the generic one */
319
                        if (cls->shutdown)
320
                                cls->shutdown(sysdev);
321
                }
322
        }
323
        mutex_unlock(&sysdev_drivers_lock);
324
}
325
 
326
static void __sysdev_resume(struct sys_device *dev)
327
{
328
        struct sysdev_class *cls = dev->cls;
329
        struct sysdev_driver *drv;
330
 
331
        /* First, call the class-specific one */
332
        if (cls->resume)
333
                cls->resume(dev);
334
 
335
        /* Call auxillary drivers next. */
336
        list_for_each_entry(drv, &cls->drivers, entry) {
337
                if (drv->resume)
338
                        drv->resume(dev);
339
        }
340
}
341
 
342
/**
343
 *      sysdev_suspend - Suspend all system devices.
344
 *      @state:         Power state to enter.
345
 *
346
 *      We perform an almost identical operation as sys_device_shutdown()
347
 *      above, though calling ->suspend() instead. Interrupts are disabled
348
 *      when this called. Devices are responsible for both saving state and
349
 *      quiescing or powering down the device.
350
 *
351
 *      This is only called by the device PM core, so we let them handle
352
 *      all synchronization.
353
 */
354
 
355
int sysdev_suspend(pm_message_t state)
356
{
357
        struct sysdev_class * cls;
358
        struct sys_device *sysdev, *err_dev;
359
        struct sysdev_driver *drv, *err_drv;
360
        int ret;
361
 
362
        pr_debug("Suspending System Devices\n");
363
 
364
        list_for_each_entry_reverse(cls, &system_subsys.list,
365
                                    kset.kobj.entry) {
366
 
367
                pr_debug("Suspending type '%s':\n",
368
                         kobject_name(&cls->kset.kobj));
369
 
370
                list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
371
                        pr_debug(" %s\n", kobject_name(&sysdev->kobj));
372
 
373
                        /* Call auxillary drivers first */
374
                        list_for_each_entry(drv, &cls->drivers, entry) {
375
                                if (drv->suspend) {
376
                                        ret = drv->suspend(sysdev, state);
377
                                        if (ret)
378
                                                goto aux_driver;
379
                                }
380
                        }
381
 
382
                        /* Now call the generic one */
383
                        if (cls->suspend) {
384
                                ret = cls->suspend(sysdev, state);
385
                                if (ret)
386
                                        goto cls_driver;
387
                        }
388
                }
389
        }
390
        return 0;
391
        /* resume current sysdev */
392
cls_driver:
393
        drv = NULL;
394
        printk(KERN_ERR "Class suspend failed for %s\n",
395
                kobject_name(&sysdev->kobj));
396
 
397
aux_driver:
398
        if (drv)
399
                printk(KERN_ERR "Class driver suspend failed for %s\n",
400
                                kobject_name(&sysdev->kobj));
401
        list_for_each_entry(err_drv, &cls->drivers, entry) {
402
                if (err_drv == drv)
403
                        break;
404
                if (err_drv->resume)
405
                        err_drv->resume(sysdev);
406
        }
407
 
408
        /* resume other sysdevs in current class */
409
        list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
410
                if (err_dev == sysdev)
411
                        break;
412
                pr_debug(" %s\n", kobject_name(&err_dev->kobj));
413
                __sysdev_resume(err_dev);
414
        }
415
 
416
        /* resume other classes */
417
        list_for_each_entry_continue(cls, &system_subsys.list,
418
                                        kset.kobj.entry) {
419
                list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
420
                        pr_debug(" %s\n", kobject_name(&err_dev->kobj));
421
                        __sysdev_resume(err_dev);
422
                }
423
        }
424
        return ret;
425
}
426
 
427
 
428
/**
429
 *      sysdev_resume - Bring system devices back to life.
430
 *
431
 *      Similar to sys_device_suspend(), but we iterate the list forwards
432
 *      to guarantee that parent devices are resumed before their children.
433
 *
434
 *      Note: Interrupts are disabled when called.
435
 */
436
 
437
int sysdev_resume(void)
438
{
439
        struct sysdev_class * cls;
440
 
441
        pr_debug("Resuming System Devices\n");
442
 
443
        list_for_each_entry(cls, &system_subsys.list, kset.kobj.entry) {
444
                struct sys_device * sysdev;
445
 
446
                pr_debug("Resuming type '%s':\n",
447
                         kobject_name(&cls->kset.kobj));
448
 
449
                list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
450
                        pr_debug(" %s\n", kobject_name(&sysdev->kobj));
451
 
452
                        __sysdev_resume(sysdev);
453
                }
454
        }
455
        return 0;
456
}
457
 
458
 
459
int __init system_bus_init(void)
460
{
461
        system_subsys.kobj.parent = &devices_subsys.kobj;
462
        return subsystem_register(&system_subsys);
463
}
464
 
465
EXPORT_SYMBOL_GPL(sysdev_register);
466
EXPORT_SYMBOL_GPL(sysdev_unregister);

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