2 * arch/sh/drivers/dma/dma-sysfs.c
4 * sysfs interface for SH DMA API
6 * Copyright (C) 2004, 2005 Paul Mundt
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
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>
21 static struct sysdev_class dma_sysclass = {
25 EXPORT_SYMBOL(dma_sysclass);
27 static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
32 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
33 struct dma_info *info = get_dma_info(i);
34 struct dma_channel *channel = &info->channels[i];
36 len += sprintf(buf + len, "%2d: %14s %s\n",
37 channel->chan, info->name,
44 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
46 static int __init dma_sysclass_init(void)
50 ret = sysdev_class_register(&dma_sysclass);
52 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
57 postcore_initcall(dma_sysclass_init);
59 static ssize_t dma_show_dev_id(struct sys_device *dev, 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 sys_device *dev,
66 const char *buf, size_t count)
68 struct dma_channel *channel = to_dma_channel(dev);
69 strcpy(channel->dev_id, buf);
73 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
75 static ssize_t dma_store_config(struct sys_device *dev,
76 const char *buf, size_t count)
78 struct dma_channel *channel = to_dma_channel(dev);
81 config = simple_strtoul(buf, NULL, 0);
82 dma_configure_channel(channel->vchan, config);
87 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
89 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
91 struct dma_channel *channel = to_dma_channel(dev);
92 return sprintf(buf, "0x%08x\n", channel->mode);
95 static ssize_t dma_store_mode(struct sys_device *dev,
96 const char *buf, size_t count)
98 struct dma_channel *channel = to_dma_channel(dev);
99 channel->mode = simple_strtoul(buf, NULL, 0);
103 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
105 #define dma_ro_attr(field, fmt) \
106 static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \
108 struct dma_channel *channel = to_dma_channel(dev); \
109 return sprintf(buf, fmt, channel->field); \
111 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
113 dma_ro_attr(count, "0x%08x\n");
114 dma_ro_attr(flags, "0x%08lx\n");
116 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
118 struct sys_device *dev = &chan->dev;
122 dev->id = chan->vchan;
123 dev->cls = &dma_sysclass;
125 ret = sysdev_register(dev);
129 sysdev_create_file(dev, &attr_dev_id);
130 sysdev_create_file(dev, &attr_count);
131 sysdev_create_file(dev, &attr_mode);
132 sysdev_create_file(dev, &attr_flags);
133 sysdev_create_file(dev, &attr_config);
135 snprintf(name, sizeof(name), "dma%d", chan->chan);
136 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
139 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
141 struct sys_device *dev = &chan->dev;
144 sysdev_remove_file(dev, &attr_dev_id);
145 sysdev_remove_file(dev, &attr_count);
146 sysdev_remove_file(dev, &attr_mode);
147 sysdev_remove_file(dev, &attr_flags);
148 sysdev_remove_file(dev, &attr_config);
150 snprintf(name, sizeof(name), "dma%d", chan->chan);
151 sysfs_remove_link(&info->pdev->dev.kobj, name);
153 sysdev_unregister(dev);