Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /*
* arch/sh/drivers/dma/dma-sysfs.c
*
* sysfs interface for SH DMA API
*
* Copyright (C) 2004 - 2006 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/string.h>
#include <asm/dma.h>
static struct sysdev_class dma_sysclass = {
.name = "dma",
};
static ssize_t dma_show_devices(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct dma_info *info = get_dma_info(i);
struct dma_channel *channel = get_dma_channel(i);
if (unlikely(!info) || !channel)
continue;
len += sprintf(buf + len, "%2d: %14s %s\n",
channel->chan, info->name,
channel->dev_id);
}
return len;
}
static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
static int __init dma_sysclass_init(void)
{
int ret;
ret = sysdev_class_register(&dma_sysclass);
if (unlikely(ret))
return ret;
return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
}
postcore_initcall(dma_sysclass_init);
static ssize_t dma_show_dev_id(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
struct dma_channel *channel = to_dma_channel(dev);
return sprintf(buf, "%s\n", channel->dev_id);
}
static ssize_t dma_store_dev_id(struct sys_device *dev,
struct sysdev_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
strcpy(channel->dev_id, buf);
return count;
}
static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
static ssize_t dma_store_config(struct sys_device *dev,
struct sysdev_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
unsigned long config;
config = simple_strtoul(buf, NULL, 0);
dma_configure_channel(channel->vchan, config);
return count;
}
static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
static ssize_t dma_show_mode(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
struct dma_channel *channel = to_dma_channel(dev);
return sprintf(buf, "0x%08x\n", channel->mode);
}
static ssize_t dma_store_mode(struct sys_device *dev,
struct sysdev_attribute *attr,
const char *buf, size_t count)
{
struct dma_channel *channel = to_dma_channel(dev);
channel->mode = simple_strtoul(buf, NULL, 0);
return count;
}
static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
#define dma_ro_attr(field, fmt) \
static ssize_t dma_show_##field(struct sys_device *dev, \
struct sysdev_attribute *attr, char *buf)\
{ \
struct dma_channel *channel = to_dma_channel(dev); \
return sprintf(buf, fmt, channel->field); \
} \
static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
dma_ro_attr(count, "0x%08x\n");
dma_ro_attr(flags, "0x%08lx\n");
int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
{
struct sys_device *dev = &chan->dev;
char name[16];
int ret;
dev->id = chan->vchan;
dev->cls = &dma_sysclass;
ret = sysdev_register(dev);
if (ret)
return ret;
ret |= sysdev_create_file(dev, &attr_dev_id);
ret |= sysdev_create_file(dev, &attr_count);
ret |= sysdev_create_file(dev, &attr_mode);
ret |= sysdev_create_file(dev, &attr_flags);
ret |= sysdev_create_file(dev, &attr_config);
if (unlikely(ret)) {
dev_err(&info->pdev->dev, "Failed creating attrs\n");
return ret;
}
snprintf(name, sizeof(name), "dma%d", chan->chan);
return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
}
void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
{
struct sys_device *dev = &chan->dev;
char name[16];
sysdev_remove_file(dev, &attr_dev_id);
sysdev_remove_file(dev, &attr_count);
sysdev_remove_file(dev, &attr_mode);
sysdev_remove_file(dev, &attr_flags);
sysdev_remove_file(dev, &attr_config);
snprintf(name, sizeof(name), "dma%d", chan->chan);
sysfs_remove_link(&info->pdev->dev.kobj, name);
sysdev_unregister(dev);
}
|