/arch/sh/drivers/dma/dma-sysfs.c

  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/err.h>
 17#include <linux/string.h>
 18#include <asm/dma.h>
 19
 20static struct sysdev_class dma_sysclass = {
 21	.name = "dma",
 22};
 23
 24static ssize_t dma_show_devices(struct sys_device *dev,
 25				struct sysdev_attribute *attr, char *buf)
 26{
 27	ssize_t len = 0;
 28	int i;
 29
 30	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
 31		struct dma_info *info = get_dma_info(i);
 32		struct dma_channel *channel = get_dma_channel(i);
 33
 34		if (unlikely(!info) || !channel)
 35			continue;
 36
 37		len += sprintf(buf + len, "%2d: %14s    %s\n",
 38			       channel->chan, info->name,
 39			       channel->dev_id);
 40	}
 41
 42	return len;
 43}
 44
 45static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
 46
 47static int __init dma_sysclass_init(void)
 48{
 49	int ret;
 50
 51	ret = sysdev_class_register(&dma_sysclass);
 52	if (unlikely(ret))
 53		return ret;
 54
 55	return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
 56}
 57postcore_initcall(dma_sysclass_init);
 58
 59static ssize_t dma_show_dev_id(struct sys_device *dev,
 60				struct sysdev_attribute *attr, 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				struct sysdev_attribute *attr,
 68				const char *buf, size_t count)
 69{
 70	struct dma_channel *channel = to_dma_channel(dev);
 71	strcpy(channel->dev_id, buf);
 72	return count;
 73}
 74
 75static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
 76
 77static ssize_t dma_store_config(struct sys_device *dev,
 78				struct sysdev_attribute *attr,
 79				const char *buf, size_t count)
 80{
 81	struct dma_channel *channel = to_dma_channel(dev);
 82	unsigned long config;
 83
 84	config = simple_strtoul(buf, NULL, 0);
 85	dma_configure_channel(channel->vchan, config);
 86
 87	return count;
 88}
 89
 90static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
 91
 92static ssize_t dma_show_mode(struct sys_device *dev,
 93				struct sysdev_attribute *attr, char *buf)
 94{
 95	struct dma_channel *channel = to_dma_channel(dev);
 96	return sprintf(buf, "0x%08x\n", channel->mode);
 97}
 98
 99static ssize_t dma_store_mode(struct sys_device *dev,
100			      struct sysdev_attribute *attr,
101			      const char *buf, size_t count)
102{
103	struct dma_channel *channel = to_dma_channel(dev);
104	channel->mode = simple_strtoul(buf, NULL, 0);
105	return count;
106}
107
108static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
109
110#define dma_ro_attr(field, fmt)						\
111static ssize_t dma_show_##field(struct sys_device *dev, 		\
112				struct sysdev_attribute *attr, char *buf)\
113{									\
114	struct dma_channel *channel = to_dma_channel(dev);		\
115	return sprintf(buf, fmt, channel->field);			\
116}									\
117static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
118
119dma_ro_attr(count, "0x%08x\n");
120dma_ro_attr(flags, "0x%08lx\n");
121
122int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
123{
124	struct sys_device *dev = &chan->dev;
125	char name[16];
126	int ret;
127
128	dev->id  = chan->vchan;
129	dev->cls = &dma_sysclass;
130
131	ret = sysdev_register(dev);
132	if (ret)
133		return ret;
134
135	ret |= sysdev_create_file(dev, &attr_dev_id);
136	ret |= sysdev_create_file(dev, &attr_count);
137	ret |= sysdev_create_file(dev, &attr_mode);
138	ret |= sysdev_create_file(dev, &attr_flags);
139	ret |= sysdev_create_file(dev, &attr_config);
140
141	if (unlikely(ret)) {
142		dev_err(&info->pdev->dev, "Failed creating attrs\n");
143		return ret;
144	}
145
146	snprintf(name, sizeof(name), "dma%d", chan->chan);
147	return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
148}
149
150void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
151{
152	struct sys_device *dev = &chan->dev;
153	char name[16];
154
155	sysdev_remove_file(dev, &attr_dev_id);
156	sysdev_remove_file(dev, &attr_count);
157	sysdev_remove_file(dev, &attr_mode);
158	sysdev_remove_file(dev, &attr_flags);
159	sysdev_remove_file(dev, &attr_config);
160
161	snprintf(name, sizeof(name), "dma%d", chan->chan);
162	sysfs_remove_link(&info->pdev->dev.kobj, name);
163
164	sysdev_unregister(dev);
165}