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
|
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/kfifo.h>
#include <linux/mutex.h>
#include "kfifo_buf.h"
static inline int __iio_allocate_kfifo(struct iio_kfifo *buf,
int bytes_per_datum, int length)
{
if ((length == 0) || (bytes_per_datum == 0))
return -EINVAL;
__iio_update_ring_buffer(&buf->ring, bytes_per_datum, length);
return kfifo_alloc(&buf->kf, bytes_per_datum*length, GFP_KERNEL);
}
int iio_request_update_kfifo(struct iio_ring_buffer *r)
{
int ret = 0;
struct iio_kfifo *buf = iio_to_kfifo(r);
mutex_lock(&buf->use_lock);
if (!buf->update_needed)
goto error_ret;
if (buf->use_count) {
ret = -EAGAIN;
goto error_ret;
}
kfifo_free(&buf->kf);
ret = __iio_allocate_kfifo(buf, buf->ring.bytes_per_datum,
buf->ring.length);
error_ret:
mutex_unlock(&buf->use_lock);
return ret;
}
EXPORT_SYMBOL(iio_request_update_kfifo);
void iio_mark_kfifo_in_use(struct iio_ring_buffer *r)
{
struct iio_kfifo *buf = iio_to_kfifo(r);
mutex_lock(&buf->use_lock);
buf->use_count++;
mutex_unlock(&buf->use_lock);
}
EXPORT_SYMBOL(iio_mark_kfifo_in_use);
void iio_unmark_kfifo_in_use(struct iio_ring_buffer *r)
{
struct iio_kfifo *buf = iio_to_kfifo(r);
mutex_lock(&buf->use_lock);
buf->use_count--;
mutex_unlock(&buf->use_lock);
}
EXPORT_SYMBOL(iio_unmark_kfifo_in_use);
int iio_get_length_kfifo(struct iio_ring_buffer *r)
{
return r->length;
}
EXPORT_SYMBOL(iio_get_length_kfifo);
static inline void __iio_init_kfifo(struct iio_kfifo *kf)
{
mutex_init(&kf->use_lock);
}
static IIO_RING_ENABLE_ATTR;
static IIO_RING_BYTES_PER_DATUM_ATTR;
static IIO_RING_LENGTH_ATTR;
static struct attribute *iio_kfifo_attributes[] = {
&dev_attr_length.attr,
&dev_attr_bytes_per_datum.attr,
&dev_attr_enable.attr,
NULL,
};
static struct attribute_group iio_kfifo_attribute_group = {
.attrs = iio_kfifo_attributes,
};
static const struct attribute_group *iio_kfifo_attribute_groups[] = {
&iio_kfifo_attribute_group,
NULL
};
static void iio_kfifo_release(struct device *dev)
{
struct iio_ring_buffer *r = to_iio_ring_buffer(dev);
struct iio_kfifo *kf = iio_to_kfifo(r);
kfifo_free(&kf->kf);
kfree(kf);
}
static struct device_type iio_kfifo_type = {
.release = iio_kfifo_release,
.groups = iio_kfifo_attribute_groups,
};
struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev)
{
struct iio_kfifo *kf;
kf = kzalloc(sizeof *kf, GFP_KERNEL);
if (!kf)
return NULL;
iio_ring_buffer_init(&kf->ring, indio_dev);
__iio_init_kfifo(kf);
kf->ring.dev.type = &iio_kfifo_type;
device_initialize(&kf->ring.dev);
kf->ring.dev.parent = &indio_dev->dev;
kf->ring.dev.bus = &iio_bus_type;
dev_set_drvdata(&kf->ring.dev, (void *)&(kf->ring));
return &kf->ring;
}
EXPORT_SYMBOL(iio_kfifo_allocate);
int iio_get_bytes_per_datum_kfifo(struct iio_ring_buffer *r)
{
return r->bytes_per_datum;
}
EXPORT_SYMBOL(iio_get_bytes_per_datum_kfifo);
int iio_set_bytes_per_datum_kfifo(struct iio_ring_buffer *r, size_t bpd)
{
if (r->bytes_per_datum != bpd) {
r->bytes_per_datum = bpd;
if (r->access.mark_param_change)
r->access.mark_param_change(r);
}
return 0;
}
EXPORT_SYMBOL(iio_set_bytes_per_datum_kfifo);
int iio_mark_update_needed_kfifo(struct iio_ring_buffer *r)
{
struct iio_kfifo *kf = iio_to_kfifo(r);
kf->update_needed = true;
return 0;
}
EXPORT_SYMBOL(iio_mark_update_needed_kfifo);
int iio_set_length_kfifo(struct iio_ring_buffer *r, int length)
{
if (r->length != length) {
r->length = length;
if (r->access.mark_param_change)
r->access.mark_param_change(r);
}
return 0;
}
EXPORT_SYMBOL(iio_set_length_kfifo);
void iio_kfifo_free(struct iio_ring_buffer *r)
{
if (r)
iio_put_ring_buffer(r);
}
EXPORT_SYMBOL(iio_kfifo_free);
int iio_store_to_kfifo(struct iio_ring_buffer *r, u8 *data, s64 timestamp)
{
int ret;
struct iio_kfifo *kf = iio_to_kfifo(r);
u8 *datal = kmalloc(r->bytes_per_datum, GFP_KERNEL);
memcpy(datal, data, r->bytes_per_datum - sizeof(timestamp));
memcpy(datal + r->bytes_per_datum - sizeof(timestamp),
×tamp, sizeof(timestamp));
ret = kfifo_in(&kf->kf, data, r->bytes_per_datum);
if (ret != r->bytes_per_datum) {
kfree(datal);
return -EBUSY;
}
kfree(datal);
return 0;
}
EXPORT_SYMBOL(iio_store_to_kfifo);
int iio_rip_kfifo(struct iio_ring_buffer *r,
size_t count, char __user *buf, int *deadoffset)
{
int ret, copied;
struct iio_kfifo *kf = iio_to_kfifo(r);
*deadoffset = 0;
ret = kfifo_to_user(&kf->kf, buf, r->bytes_per_datum*count, &copied);
return copied;
}
EXPORT_SYMBOL(iio_rip_kfifo);
MODULE_LICENSE("GPL");
|
