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
|
#include <linux/module.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/mm.h>
#include <linux/firmware.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <emd_ctl.h>
#define EMD_NODE_TYPE_NUM 2
typedef struct _emd_node
{
char *name;
char *type;
int idx;
int ext_num;
}emd_node_t;
typedef struct _emd_node_type
{
char *type;
int major;
int minor_start;
int range;
}emd_node_type_t;
typedef struct _emd_node_type_table
{
int major;
emd_node_type_t array[EMD_NODE_TYPE_NUM];
}emd_node_type_table_t;
static emd_node_t emd1_node_list[] = {
{"emd_ctl", "chr", 0, EMD_CHR_CLIENT_NUM},
{"emd_cfifo", "cfifo", 0, EMD_CFIFO_NUM*2},
};
int emd_get_dev_major_for_md_sys(int md_id)
{
if(md_id==0)
{
return EMD_CHR_DEV_MAJOR;
}
else
{
return -1;
}
}
static emd_node_type_table_t emd_node_type_table[EMD_MAX_NUM];
static void *dev_class = NULL;
static void init_emd_node_type_table(void)
{
int i;
int curr = 0;
int major;
emd_node_type_table_t *curr_table = NULL;
memset(emd_node_type_table, 0, sizeof(emd_node_type_table));
for(i = 0; i < EMD_MAX_NUM; i++){
major = emd_get_dev_major_for_md_sys(i);
curr_table = &emd_node_type_table[i];
curr = 0;
if(major < 0)
continue;
curr_table->major = major;
curr_table->array[0].type = "chr";
curr_table->array[0].major = major;
curr_table->array[0].minor_start = curr;
curr_table->array[0].range = EMD_CHR_CLIENT_NUM;
curr += EMD_CHR_CLIENT_NUM;
curr_table->array[1].type = "cfifo";
curr_table->array[1].major = major;
curr_table->array[1].minor_start = curr;
curr_table->array[1].range = EMD_CFIFO_NUM*2;
curr += EMD_CFIFO_NUM*2;
}
}
int emd_get_md_id_by_dev_major(int dev_major)
{
int i ;
for(i = 0; i < EMD_MAX_NUM; i++){
if(emd_node_type_table[i].major == dev_major)
return i;
}
return -1;
}
int emd_get_dev_id_by_md_id(int md_id, char node_name[], int *major, int* minor)
{
int i;
emd_node_type_table_t *curr_table = NULL;
curr_table = &emd_node_type_table[md_id];
for(i = 0; i < EMD_NODE_TYPE_NUM; i++) {
if(curr_table->array[i].type == NULL)
break;
if(strcmp(curr_table->array[i].type, node_name) == 0) {
if(major != NULL)
*major = curr_table->array[i].major;
if(minor != NULL)
*minor = curr_table->array[i].minor_start;
return 0;
}
}
return -1;
}
/***************************************************************************
* Make device node helper function section
***************************************************************************/
static void* create_dev_class(struct module *owner, const char *name)
{
int err = 0;
struct class *dev_class = class_create(owner, name);
if(IS_ERR(dev_class)){
err = PTR_ERR(dev_class);
EMD_MSG_INF("node","create %s class fail: %d\n", name, err);
return NULL;
}
return dev_class;
}
static int register_dev_node(void *dev_class, const char *name, int major_id, int minor_start_id, int index)
{
int ret = 0;
dev_t dev;
struct device *devices;
if(index >= 0) {
dev = MKDEV(major_id, minor_start_id) + index;
devices = device_create( (struct class *)dev_class, NULL, dev, NULL, "%s%d", name, index );
} else {
dev = MKDEV(major_id, minor_start_id);
devices = device_create( (struct class *)dev_class, NULL, dev, NULL, "%s", name );
}
if(IS_ERR(devices)) {
ret = PTR_ERR(devices);
}
return ret;
}
static void release_dev_node(void *dev_class, int major_id, int minor_start_id, int index)
{
dev_t dev;
if(index >= 0) {
dev = MKDEV(major_id, minor_start_id) + index;
device_destroy((struct class *)dev_class, dev);
} else {
dev = MKDEV(major_id, minor_start_id);
device_destroy((struct class *)dev_class, dev);
}
}
void release_emd_dev_node(void)
{
if (dev_class)
class_destroy((struct class *)dev_class);
}
int emd_dev_node_init(int md_id)
{
int i, j, major, minor, num;
emd_node_t *dev_node;
int ret = 0;
if(dev_class==NULL)
{
init_emd_node_type_table();
dev_class = create_dev_class(THIS_MODULE, "emd_node");
}
if (md_id == 0) {
dev_node = emd1_node_list;
num = sizeof(emd1_node_list)/sizeof(emd_node_t);
} else {
return -1;
}
for(i = 0; i < num; i++) {
if(emd_get_dev_id_by_md_id(md_id, dev_node[i].type, &major, &minor) < 0)
break;
minor = minor + dev_node[i].idx;
if(dev_node[i].ext_num == 0) {
ret = register_dev_node(dev_class, dev_node[i].name, major, minor, -1);
if(ret < 0)
EMD_MSG_INF("node","create %s device fail: %d\n", dev_node[i].name, ret);
} else {
for(j = 0; j < dev_node[i].ext_num; j++) {
ret = register_dev_node(dev_class, dev_node[i].name, major, minor, j);
if(ret < 0) {
EMD_MSG_INF("node","create %s device fail: %d\n", dev_node[i].name, ret);
return ret;
}
}
}
}
return ret;
}
void emd_dev_node_exit(int md_id)
{
int i, j, major, minor, num;
emd_node_t *dev_node;
if (md_id == 0) {
dev_node = emd1_node_list;
num = sizeof(emd1_node_list)/sizeof(emd_node_t);
} else {
return;
}
for(i = 0; i < num; i++) {
if(emd_get_dev_id_by_md_id(md_id, dev_node[i].type, &major, &minor) < 0)
break;
minor = minor + dev_node[i].idx;
if(dev_node[i].ext_num == 0) {
release_dev_node(dev_class, major, minor, -1);
} else {
for(j = 0; j < dev_node[i].ext_num; j++)
release_dev_node(dev_class, major, minor, j);
}
}
}
|
