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
|
/*
* arch/sh/drivers/dma/dma-sysfs.c
*
* sysfs interface for SH DMA API
*
* Copyright (C) 2004 - 2006 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/string.h>
#include <asm/dma.h>
static struct bus_type dma_subsys = {
.name = "dma",
.dev_name = "dma",
};
static ssize_t dma_show_devices(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; i < 16; i++) {
struct dma_info *info = get_dma_info(i);
struct dma_channel *channel = get_dma_channel(i);
if (unlikely(!info) || !channel)
continue;
len += sprintf(buf + len, "%2d: %14s %s\n",
channel->chan, info->name,
channel->dev_id);
}
return len;
}
static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
static int __init dma_subsys_init(void)
{
int ret;
ret = subsys_system_register(&dma_subsys, NULL);
if (unlikely(ret))
return ret;
return device_create_file(dma_subsys.dev_root, &dev_attr_devices);
}
postcore_initcall(dma_subsys_init);
static ssize_t dma_show_dev_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dma_channel *channel = to_dma_channel(dev);
return sprintf(buf, "%s\n", channel->dev_id);
}
static ssize_t dma_store_dev_id(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
strcpy(channel->dev_id, buf);
return count;
}
static DEVICE_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
static ssize_t dma_store_config(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
unsigned long config;
config = simple_strtoul(buf, NULL, 0);
dma_configure_channel(channel->vchan, config);
return count;
}
static DEVICE_ATTR(config, S_IWUSR, NULL, dma_store_config);
static ssize_t dma_show_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dma_channel *channel = to_dma_channel(dev);
return sprintf(buf, "0x%08x\n", channel->mode);
}
static ssize_t dma_store_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
channel->mode = simple_strtoul(buf, NULL, 0);
return count;
}
static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
#define dma_ro_attr(field, fmt) \
static ssize_t dma_show_##field(struct device *dev, \
struct device_attribute *attr, char *buf)\
{ \
struct dma_channel *channel = to_dma_channel(dev); \
return sprintf(buf, fmt, channel->field); \
} \
static DEVICE_ATTR(field, S_IRUGO, dma_show_##field, NULL);
dma_ro_attr(count, "0x%08x\n");
dma_ro_attr(flags, "0x%08lx\n");
int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
{
struct device *dev = &chan->dev;
char name[16];
int ret;
dev->id = chan->vchan;
dev->bus = &dma_subsys;
ret = device_register(dev);
if (ret)
return ret;
ret |= device_create_file(dev, &dev_attr_dev_id);
ret |= device_create_file(dev, &dev_attr_count);
ret |= device_create_file(dev, &dev_attr_mode);
ret |= device_create_file(dev, &dev_attr_flags);
ret |= device_create_file(dev, &dev_attr_config);
if (unlikely(ret)) {
dev_err(&info->pdev->dev, "Failed creating attrs\n");
return ret;
}
snprintf(name, sizeof(name), "dma%d", chan->chan);
return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
}
void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
{
struct device *dev = &chan->dev;
char name[16];
device_remove_file(dev, &dev_attr_dev_id);
device_remove_file(dev, &dev_attr_count);
device_remove_file(dev, &dev_attr_mode);
device_remove_file(dev, &dev_attr_flags);
device_remove_file(dev, &dev_attr_config);
snprintf(name, sizeof(name), "dma%d", chan->chan);
sysfs_remove_link(&info->pdev->dev.kobj, name);
device_unregister(dev);
}
|
