1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
#include <sys/sysmacros.h>
#include <sys/sunddi.h>
#include "config.h"
static spinlock_t dev_info_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(dev_info_list);
static struct dev_info *
get_dev_info(dev_t dev)
{
struct dev_info *di;
spin_lock(&dev_info_lock);
list_for_each_entry(di, &dev_info_list, di_list)
if (di->di_dev == dev)
goto out;
di = NULL;
out:
spin_unlock(&dev_info_lock);
return di;
}
static int
mod_generic_ioctl(struct inode *ino, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct dev_info *di;
int rc, flag = 0, rvalp = 0;
cred_t *cr = NULL;
di = get_dev_info(MKDEV(imajor(ino), iminor(ino)));
if (di == NULL)
return EINVAL;
rc = di->di_ops->devo_cb_ops->cb_ioctl(di->di_dev,
(int)cmd,(intptr_t)arg,
flag, cr, &rvalp);
return rc;
}
int
__ddi_create_minor_node(dev_info_t *di, char *name, int spec_type,
minor_t minor_num, char *node_type,
int flag, struct module *mod)
{
struct cdev *cdev;
struct dev_ops *dev_ops;
struct cb_ops *cb_ops;
struct file_operations *fops;
int rc;
BUG_ON(spec_type != S_IFCHR);
BUG_ON(minor_num < di->di_minors);
BUG_ON(strcmp(node_type, DDI_PSEUDO));
BUG_ON(flag != 0);
fops = kmalloc(sizeof(struct file_operations), GFP_KERNEL);
if (fops == NULL)
return DDI_FAILURE;
cdev = cdev_alloc();
if (cdev == NULL) {
kfree(fops);
return DDI_FAILURE;
}
cdev->ops = fops;
mutex_enter(&di->di_lock);
dev_ops = di->di_ops;
BUG_ON(dev_ops == NULL);
cb_ops = di->di_ops->devo_cb_ops;
BUG_ON(cb_ops == NULL);
/* Setup the fops to cb_ops mapping */
fops->owner = mod;
if (cb_ops->cb_ioctl)
fops->ioctl = mod_generic_ioctl;
#if 0
if (cb_ops->cb_open)
fops->open = mod_generic_open;
if (cb_ops->cb_close)
fops->release = mod_generic_close;
if (cb_ops->cb_read)
fops->read = mod_generic_read;
if (cb_ops->cb_write)
fops->write = mod_generic_write;
#endif
/* XXX: Currently unsupported operations */
BUG_ON(cb_ops->cb_open != NULL);
BUG_ON(cb_ops->cb_close != NULL);
BUG_ON(cb_ops->cb_read != NULL);
BUG_ON(cb_ops->cb_write != NULL);
BUG_ON(cb_ops->cb_strategy != NULL);
BUG_ON(cb_ops->cb_print != NULL);
BUG_ON(cb_ops->cb_dump != NULL);
BUG_ON(cb_ops->cb_devmap != NULL);
BUG_ON(cb_ops->cb_mmap != NULL);
BUG_ON(cb_ops->cb_segmap != NULL);
BUG_ON(cb_ops->cb_chpoll != NULL);
BUG_ON(cb_ops->cb_prop_op != NULL);
BUG_ON(cb_ops->cb_str != NULL);
BUG_ON(cb_ops->cb_aread != NULL);
BUG_ON(cb_ops->cb_awrite != NULL);
di->di_minor = minor_num;
di->di_dev = MKDEV(di->di_major, di->di_minor);
rc = cdev_add(cdev, di->di_dev, 1);
if (rc) {
printk("spl: Error adding cdev, %d\n", rc);
kfree(fops);
cdev_del(cdev);
mutex_exit(&di->di_lock);
return DDI_FAILURE;
}
di->di_class = class_create(THIS_MODULE, name);
if (IS_ERR(di->di_class)) {
rc = PTR_ERR(di->di_class);
printk("spl: Error creating %s class, %d\n", name, rc);
kfree(fops);
cdev_del(di->di_cdev);
mutex_exit(&di->di_lock);
return DDI_FAILURE;
}
class_device_create(di->di_class, NULL, di->di_dev,
NULL, "%s%d", name, di->di_minor);
di->di_cdev = cdev;
spin_lock(&dev_info_lock);
list_add(&di->di_list, &dev_info_list);
spin_unlock(&dev_info_lock);
mutex_exit(&di->di_lock);
return DDI_SUCCESS;
}
EXPORT_SYMBOL(__ddi_create_minor_node);
static void
___ddi_remove_minor_node(dev_info_t *di, char *name)
{
class_device_destroy(di->di_class, di->di_dev);
class_destroy(di->di_class);
cdev_del(di->di_cdev);
spin_lock(&dev_info_lock);
list_del(&di->di_list);
spin_unlock(&dev_info_lock);
}
void
__ddi_remove_minor_node(dev_info_t *di, char *name)
{
mutex_enter(&di->di_lock);
___ddi_remove_minor_node(di, name);
mutex_exit(&di->di_lock);
}
EXPORT_SYMBOL(ddi_remove_minor_node);
#if 0
static int
mod_generic_open(struct inode *, struct file *)
{
open(dev_t *devp, int flag, int otyp, cred_t *credp);
}
static int
mod_generic_close(struct inode *, struct file *)
{
close(dev_t dev, int flag, int otyp, cred_t *credp);
}
static ssize_t
mod_generic_read(struct file *, char __user *, size_t, loff_t *)
{
read(dev_t dev, struct uio *uiop, cred_t *credp);
}
static ssize_t
mod_generic_write(struct file *, const char __user *, size_t, loff_t *)
{
write(dev_t dev, struct uio *uiop, cred_t *credp);
}
#endif
static struct dev_info *
dev_info_alloc(major_t major, minor_t minors, struct dev_ops *ops) {
struct dev_info *di;
di = kmalloc(sizeof(struct dev_info), GFP_KERNEL);
if (di == NULL)
return NULL;
mutex_init(&di->di_lock, NULL, MUTEX_DEFAULT, NULL);
INIT_LIST_HEAD(&di->di_list);
di->di_ops = ops;
di->di_class = NULL;
di->di_cdev = NULL;
di->di_major = major;
di->di_minor = 0;
di->di_minors = minors;
di->di_dev = 0;
return di;
}
static void
dev_info_free(struct dev_info *di)
{
mutex_enter(&di->di_lock);
__ddi_remove_minor_node(di, NULL);
mutex_exit(&di->di_lock);
mutex_destroy(&di->di_lock);
kfree(di);
}
int
__mod_install(struct modlinkage *modlp)
{
struct modldrv *drv = modlp->ml_modldrv;
struct dev_info *di;
int rc;
di = dev_info_alloc(modlp->ml_major, modlp->ml_minors,
drv->drv_dev_ops);
if (di == NULL)
return ENOMEM;
/* XXX: Really we need to be calling devo_probe if it's available
* and then calling devo_attach for each device discovered. However
* for now we just call it once and let the app sort it out.
*/
rc = drv->drv_dev_ops->devo_attach(di, DDI_ATTACH);
if (rc != DDI_SUCCESS) {
dev_info_free(di);
return rc;
}
drv->drv_dev_info = di;
return DDI_SUCCESS;
}
EXPORT_SYMBOL(__mod_install);
int
__mod_remove(struct modlinkage *modlp)
{
struct modldrv *drv = modlp->ml_modldrv;
struct dev_info *di = drv->drv_dev_info;
int rc;
rc = drv->drv_dev_ops->devo_detach(di, DDI_DETACH);
if (rc != DDI_SUCCESS)
return rc;
dev_info_free(di);
drv->drv_dev_info = NULL;
return DDI_SUCCESS;
}
EXPORT_SYMBOL(__mod_remove);
int
ldi_ident_from_mod(struct modlinkage *modlp, ldi_ident_t *lip)
{
ldi_ident_t li;
BUG_ON(modlp == NULL || lip == NULL);
li = kmalloc(sizeof(struct ldi_ident), GFP_KERNEL);
if (li == NULL)
return ENOMEM;
li->li_dev = MKDEV(modlp->ml_major, 0);
*lip = li;
return 0;
}
EXPORT_SYMBOL(ldi_ident_from_mod);
void
ldi_ident_release(ldi_ident_t lip)
{
BUG_ON(lip == NULL);
kfree(lip);
}
EXPORT_SYMBOL(ldi_ident_release);
|
