2 * arch/sh/drivers/dma/dma-sysfs.c
4 * sysfs interface for SH DMA API
6 * Copyright (C) 2004 - 2006 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/stat.h>
15 #include <linux/sysdev.h>
16 #include <linux/platform_device.h>
17 #include <linux/err.h>
18 #include <linux/string.h>
21 static struct sysdev_class dma_sysclass = {
25 static ssize_t dma_show_devices(struct sys_device *dev,
26 struct sysdev_attribute *attr, char *buf)
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);
35 if (unlikely(!info) || !channel)
38 len += sprintf(buf + len, "%2d: %14s %s\n",
39 channel->chan, info->name,
46 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
48 static int __init dma_sysclass_init(void)
52 ret = sysdev_class_register(&dma_sysclass);
56 return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
58 postcore_initcall(dma_sysclass_init);
60 static ssize_t dma_show_dev_id(struct sys_device *dev,
61 struct sysdev_attribute *attr, char *buf)
63 struct dma_channel *channel = to_dma_channel(dev);
64 return sprintf(buf, "%s\n", channel->dev_id);
67 static ssize_t dma_store_dev_id(struct sys_device *dev,
68 struct sysdev_attribute *attr,
69 const char *buf, size_t count)
71 struct dma_channel *channel = to_dma_channel(dev);
72 strcpy(channel->dev_id, buf);
76 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
78 static ssize_t dma_store_config(struct sys_device *dev,
79 struct sysdev_attribute *attr,
80 const char *buf, size_t count)
82 struct dma_channel *channel = to_dma_channel(dev);
85 config = simple_strtoul(buf, NULL, 0);
86 dma_configure_channel(channel->vchan, config);
91 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
93 static ssize_t dma_show_mode(struct sys_device *dev,
94 struct sysdev_attribute *attr, char *buf)
96 struct dma_channel *channel = to_dma_channel(dev);
97 return sprintf(buf, "0x%08x\n", channel->mode);
100 static ssize_t dma_store_mode(struct sys_device *dev,
101 struct sysdev_attribute *attr,
102 const char *buf, size_t count)
104 struct dma_channel *channel = to_dma_channel(dev);
105 channel->mode = simple_strtoul(buf, NULL, 0);
109 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
111 #define dma_ro_attr(field, fmt) \
112 static ssize_t dma_show_##field(struct sys_device *dev, \
113 struct sysdev_attribute *attr, char *buf)\
115 struct dma_channel *channel = to_dma_channel(dev); \
116 return sprintf(buf, fmt, channel->field); \
118 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
120 dma_ro_attr(count, "0x%08x\n");
121 dma_ro_attr(flags, "0x%08lx\n");
123 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
125 struct sys_device *dev = &chan->dev;
129 dev->id = chan->vchan;
130 dev->cls = &dma_sysclass;
132 ret = sysdev_register(dev);
136 ret |= sysdev_create_file(dev, &attr_dev_id);
137 ret |= sysdev_create_file(dev, &attr_count);
138 ret |= sysdev_create_file(dev, &attr_mode);
139 ret |= sysdev_create_file(dev, &attr_flags);
140 ret |= sysdev_create_file(dev, &attr_config);
143 dev_err(&info->pdev->dev, "Failed creating attrs\n");
147 snprintf(name, sizeof(name), "dma%d", chan->chan);
148 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
151 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
153 struct sys_device *dev = &chan->dev;
156 sysdev_remove_file(dev, &attr_dev_id);
157 sysdev_remove_file(dev, &attr_count);
158 sysdev_remove_file(dev, &attr_mode);
159 sysdev_remove_file(dev, &attr_flags);
160 sysdev_remove_file(dev, &attr_config);
162 snprintf(name, sizeof(name), "dma%d", chan->chan);
163 sysfs_remove_link(&info->pdev->dev.kobj, name);
165 sysdev_unregister(dev);