aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/drivers/dma/dma-sysfs.c
blob: 6e3b58bd8795f4790223fa74b2c914377a862c08 (plain)
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
/*
 * arch/sh/drivers/dma/dma-sysfs.c
 *
 * sysfs interface for SH DMA API
 *
 * Copyright (C) 2004  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/sysdev.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/dma.h>

static struct sysdev_class dma_sysclass = {
	set_kset_name("dma"),
};

EXPORT_SYMBOL(dma_sysclass);

static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
{
	ssize_t len = 0;
	int i;

	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
		struct dma_info *info = get_dma_info(i);
		struct dma_channel *channel = &info->channels[i];

		len += sprintf(buf + len, "%2d: %14s    %s\n",
			       channel->chan, info->name,
			       channel->dev_id);
	}

	return len;
}

static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);

static int __init dma_sysclass_init(void)
{
	int ret;

	ret = sysdev_class_register(&dma_sysclass);
	if (ret == 0)
		sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);

	return ret;
}

postcore_initcall(dma_sysclass_init);

static ssize_t dma_show_dev_id(struct sys_device *dev, 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 sys_device *dev,
				const char *buf, size_t count)
{
	struct dma_channel *channel = to_dma_channel(dev);
	strcpy(channel->dev_id, buf);
	return count;
}

static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);

static ssize_t dma_store_config(struct sys_device *dev,
				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->chan, config);

	return count;
}

static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);

static ssize_t dma_show_mode(struct sys_device *dev, 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 sys_device *dev,
			      const char *buf, size_t count)
{
	struct dma_channel *channel = to_dma_channel(dev);
	channel->mode = simple_strtoul(buf, NULL, 0);
	return count;
}

static SYSDEV_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 sys_device *dev, char *buf)	\
{									\
	struct dma_channel *channel = to_dma_channel(dev);		\
	return sprintf(buf, fmt, channel->field);			\
}									\
static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);

dma_ro_attr(count, "0x%08x\n");
dma_ro_attr(flags, "0x%08lx\n");

int __init dma_create_sysfs_files(struct dma_channel *chan)
{
	struct sys_device *dev = &chan->dev;
	int ret;

	dev->id  = chan->chan;
	dev->cls = &dma_sysclass;

	ret = sysdev_register(dev);
	if (ret)
		return ret;

	sysdev_create_file(dev, &attr_dev_id);
	sysdev_create_file(dev, &attr_count);
	sysdev_create_file(dev, &attr_mode);
	sysdev_create_file(dev, &attr_flags);
	sysdev_create_file(dev, &attr_config);

	return 0;
}