1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sh/drivers/dma/dma-sysfs.c
5 * sysfs interface for SH DMA API
7 * Copyright (C) 2004 - 2006 Paul Mundt
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/stat.h>
12 #include <linux/device.h>
13 #include <linux/platform_device.h>
14 #include <linux/err.h>
15 #include <linux/string.h>
18 static struct bus_type dma_subsys = {
23 static ssize_t dma_show_devices(struct device *dev,
24 struct device_attribute *attr, char *buf)
29 for (i = 0; i < 16; i++) {
30 struct dma_info *info = get_dma_info(i);
31 struct dma_channel *channel = get_dma_channel(i);
33 if (unlikely(!info) || !channel)
36 len += sprintf(buf + len, "%2d: %14s %s\n",
37 channel->chan, info->name,
44 static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
46 static int __init dma_subsys_init(void)
50 ret = subsys_system_register(&dma_subsys, NULL);
54 return device_create_file(dma_subsys.dev_root, &dev_attr_devices);
56 postcore_initcall(dma_subsys_init);
58 static ssize_t dma_show_dev_id(struct device *dev,
59 struct device_attribute *attr, char *buf)
61 struct dma_channel *channel = to_dma_channel(dev);
62 return sprintf(buf, "%s\n", channel->dev_id);
65 static ssize_t dma_store_dev_id(struct device *dev,
66 struct device_attribute *attr,
67 const char *buf, size_t count)
69 struct dma_channel *channel = to_dma_channel(dev);
70 strcpy(channel->dev_id, buf);
74 static DEVICE_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
76 static ssize_t dma_store_config(struct device *dev,
77 struct device_attribute *attr,
78 const char *buf, size_t count)
80 struct dma_channel *channel = to_dma_channel(dev);
83 config = simple_strtoul(buf, NULL, 0);
84 dma_configure_channel(channel->vchan, config);
89 static DEVICE_ATTR(config, S_IWUSR, NULL, dma_store_config);
91 static ssize_t dma_show_mode(struct device *dev,
92 struct device_attribute *attr, char *buf)
94 struct dma_channel *channel = to_dma_channel(dev);
95 return sprintf(buf, "0x%08x\n", channel->mode);
98 static ssize_t dma_store_mode(struct device *dev,
99 struct device_attribute *attr,
100 const char *buf, size_t count)
102 struct dma_channel *channel = to_dma_channel(dev);
103 channel->mode = simple_strtoul(buf, NULL, 0);
107 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
109 #define dma_ro_attr(field, fmt) \
110 static ssize_t dma_show_##field(struct device *dev, \
111 struct device_attribute *attr, char *buf)\
113 struct dma_channel *channel = to_dma_channel(dev); \
114 return sprintf(buf, fmt, channel->field); \
116 static DEVICE_ATTR(field, S_IRUGO, dma_show_##field, NULL);
118 dma_ro_attr(count, "0x%08x\n");
119 dma_ro_attr(flags, "0x%08lx\n");
121 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
123 struct device *dev = &chan->dev;
127 dev->id = chan->vchan;
128 dev->bus = &dma_subsys;
130 ret = device_register(dev);
134 ret |= device_create_file(dev, &dev_attr_dev_id);
135 ret |= device_create_file(dev, &dev_attr_count);
136 ret |= device_create_file(dev, &dev_attr_mode);
137 ret |= device_create_file(dev, &dev_attr_flags);
138 ret |= device_create_file(dev, &dev_attr_config);
141 dev_err(&info->pdev->dev, "Failed creating attrs\n");
145 snprintf(name, sizeof(name), "dma%d", chan->chan);
146 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
149 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
151 struct device *dev = &chan->dev;
154 device_remove_file(dev, &dev_attr_dev_id);
155 device_remove_file(dev, &dev_attr_count);
156 device_remove_file(dev, &dev_attr_mode);
157 device_remove_file(dev, &dev_attr_flags);
158 device_remove_file(dev, &dev_attr_config);
160 snprintf(name, sizeof(name), "dma%d", chan->chan);
161 sysfs_remove_link(&info->pdev->dev.kobj, name);
163 device_unregister(dev);