1/*
2 * arch/sh/drivers/dma/dma-sysfs.c
3 *
4 * sysfs interface for SH DMA API
5 *
6 * Copyright (C) 2004 - 2006  Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/sysdev.h>
15#include <linux/platform_device.h>
16#include <linux/module.h>
17#include <linux/err.h>
18#include <linux/string.h>
19#include <asm/dma.h>
20
21static struct sysdev_class dma_sysclass = {
22	set_kset_name("dma"),
23};
24EXPORT_SYMBOL(dma_sysclass);
25
26static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
27{
28	ssize_t len = 0;
29	int i;
30
31	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
32		struct dma_info *info = get_dma_info(i);
33		struct dma_channel *channel = get_dma_channel(i);
34
35		if (unlikely(!info) || !channel)
36			continue;
37
38		len += sprintf(buf + len, "%2d: %14s    %s\n",
39			       channel->chan, info->name,
40			       channel->dev_id);
41	}
42
43	return len;
44}
45
46static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
47
48static int __init dma_sysclass_init(void)
49{
50	int ret;
51
52	ret = sysdev_class_register(&dma_sysclass);
53	if (unlikely(ret))
54		return ret;
55
56	return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
57}
58postcore_initcall(dma_sysclass_init);
59
60static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
61{
62	struct dma_channel *channel = to_dma_channel(dev);
63	return sprintf(buf, "%s\n", channel->dev_id);
64}
65
66static ssize_t dma_store_dev_id(struct sys_device *dev,
67				const char *buf, size_t count)
68{
69	struct dma_channel *channel = to_dma_channel(dev);
70	strcpy(channel->dev_id, buf);
71	return count;
72}
73
74static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
75
76static ssize_t dma_store_config(struct sys_device *dev,
77				const char *buf, size_t count)
78{
79	struct dma_channel *channel = to_dma_channel(dev);
80	unsigned long config;
81
82	config = simple_strtoul(buf, NULL, 0);
83	dma_configure_channel(channel->vchan, config);
84
85	return count;
86}
87
88static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
89
90static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
91{
92	struct dma_channel *channel = to_dma_channel(dev);
93	return sprintf(buf, "0x%08x\n", channel->mode);
94}
95
96static ssize_t dma_store_mode(struct sys_device *dev,
97			      const char *buf, size_t count)
98{
99	struct dma_channel *channel = to_dma_channel(dev);
100	channel->mode = simple_strtoul(buf, NULL, 0);
101	return count;
102}
103
104static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
105
106#define dma_ro_attr(field, fmt)						\
107static ssize_t dma_show_##field(struct sys_device *dev, char *buf)	\
108{									\
109	struct dma_channel *channel = to_dma_channel(dev);		\
110	return sprintf(buf, fmt, channel->field);			\
111}									\
112static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
113
114dma_ro_attr(count, "0x%08x\n");
115dma_ro_attr(flags, "0x%08lx\n");
116
117int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
118{
119	struct sys_device *dev = &chan->dev;
120	char name[16];
121	int ret;
122
123	dev->id  = chan->vchan;
124	dev->cls = &dma_sysclass;
125
126	ret = sysdev_register(dev);
127	if (ret)
128		return ret;
129
130	ret |= sysdev_create_file(dev, &attr_dev_id);
131	ret |= sysdev_create_file(dev, &attr_count);
132	ret |= sysdev_create_file(dev, &attr_mode);
133	ret |= sysdev_create_file(dev, &attr_flags);
134	ret |= sysdev_create_file(dev, &attr_config);
135
136	if (unlikely(ret)) {
137		dev_err(&info->pdev->dev, "Failed creating attrs\n");
138		return ret;
139	}
140
141	snprintf(name, sizeof(name), "dma%d", chan->chan);
142	return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
143}
144
145void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
146{
147	struct sys_device *dev = &chan->dev;
148	char name[16];
149
150	sysdev_remove_file(dev, &attr_dev_id);
151	sysdev_remove_file(dev, &attr_count);
152	sysdev_remove_file(dev, &attr_mode);
153	sysdev_remove_file(dev, &attr_flags);
154	sysdev_remove_file(dev, &attr_config);
155
156	snprintf(name, sizeof(name), "dma%d", chan->chan);
157	sysfs_remove_link(&info->pdev->dev.kobj, name);
158
159	sysdev_unregister(dev);
160}
161