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
|
/*
* Copyright (C) ST-Ericsson SA 2010
* Authors: Jonas Aaberg <jonas.aberg@stericsson.com>
* Paer-Olof Haakansson <par-olof.hakansson@stericsson.com>
* for ST-Ericsson.
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/sysfs.h>
static ssize_t mloader_sysfs_addr(struct device *dev,
struct device_attribute *attr,
char *buf);
static ssize_t mloader_sysfs_finalize(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count);
static DEVICE_ATTR(addr, S_IRUSR|S_IRGRP, mloader_sysfs_addr, NULL);
static DEVICE_ATTR(finalize, S_IWUSR, NULL, mloader_sysfs_finalize);
static unsigned int bootargs_memmap_modem_start;
static unsigned int bootargs_memmap_modem_total_size;
static unsigned int mloader_helper_shm_total_size;
module_param_named(shm_total_size, mloader_helper_shm_total_size, uint, 0600);
MODULE_PARM_DESC(shm_total_size, "Total Size of SHM shared memory");
static int __init bootargs_memmap(char *str)
{
char *start_val_str;
bootargs_memmap_modem_total_size = simple_strtoul(str, NULL, 0);
start_val_str = strchr(str, '$');
if (start_val_str == NULL)
return -EINVAL;
bootargs_memmap_modem_start = simple_strtoul(start_val_str + 1, NULL, 0);
return 1;
}
__setup("memmap=", bootargs_memmap);
static int __init bootargs_shm_total_size(char *str)
{
mloader_helper_shm_total_size = simple_strtoul(str, NULL, 0);
return 1;
}
__setup(" mloader_helper.shm_total_size=", bootargs_shm_total_size);
static int __exit mloader_remove(struct platform_device *pdev)
{
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_addr.attr);
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_finalize.attr);
return 0;
}
static struct platform_driver mloader_driver = {
.driver = {
.name = "mloader_helper",
},
.remove = __exit_p(mloader_remove),
};
struct mloader_helper {
struct work_struct work;
struct platform_device *pdev;
};
static void mloader_clean_up(struct work_struct *work)
{
struct mloader_helper *m = container_of(work,
struct mloader_helper,
work);
/* Remove this module */
platform_device_unregister(m->pdev);
platform_driver_unregister(&mloader_driver);
kfree(m);
}
static ssize_t mloader_sysfs_addr(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "0x%x 0x%x 0x%x\n",
bootargs_memmap_modem_start,
bootargs_memmap_modem_total_size,
mloader_helper_shm_total_size);
}
static ssize_t mloader_sysfs_finalize(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct mloader_helper *m;
m = kmalloc(sizeof(struct mloader_helper), GFP_KERNEL);
m->pdev = container_of(dev,
struct platform_device,
dev);
INIT_WORK(&m->work, mloader_clean_up);
/* The module can not remove itself while being in a sysfs function,
* it has to use a workqueue.
*/
schedule_work(&m->work);
return count;
}
static void mloader_release(struct device *dev)
{
/* Nothing to release */
}
static int __init mloader_probe(struct platform_device *pdev)
{
int ret = 0;
pdev->dev.release = mloader_release;
ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_addr.attr);
if (ret)
return ret;
ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_finalize.attr);
if (ret) {
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_addr.attr);
return ret;
}
return 0;
}
static int __init mloader_init(void)
{
/*
* mLoader_helper for Fairbanks. It exports the physical
* address where the modem side ELF should be located in a sysfs
* file to make it available for a user space utility.
* When the mLoader utility has picked up these settings, this module is no
* longer needed and can be removed by writing to sysfs finalize.
*
* The modem side should be loaded via mmap'ed /dev/mem
*
*/
return platform_driver_probe(&mloader_driver, mloader_probe);
}
module_init(mloader_init);
static void __exit mloader_exit(void)
{
platform_driver_unregister(&mloader_driver);
}
module_exit(mloader_exit);
MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
MODULE_LICENSE("GPL");
|
