sysfs.c

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#include <linux/kernel.h>
#include <linux/stat.h>
/* FIX UP */
#include "soundbus.h"

#define soundbus_config_of_attr(field, format_string)           \
static ssize_t                              \
field##_show (struct device *dev, struct device_attribute *attr,    \
              char *buf)                        \
{                                   \
    struct soundbus_dev *mdev = to_soundbus_device (dev);       \
    return sprintf (buf, format_string, mdev->ofdev.dev.of_node->field); \
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
                 char *buf)
{
    struct soundbus_dev *sdev = to_soundbus_device(dev);
    struct platform_device *of = &sdev->ofdev;
    int length;

    if (*sdev->modalias) {
        strlcpy(buf, sdev->modalias, sizeof(sdev->modalias) + 1);
        strcat(buf, "\n");
        length = strlen(buf);
    } else {
        length = sprintf(buf, "of:N%sT%s\n",
                 of->dev.of_node->name, of->dev.of_node->type);
    }

    return length;
}

soundbus_config_of_attr (name, "%s\n");
soundbus_config_of_attr (type, "%s\n");

struct device_attribute soundbus_dev_attrs[] = {
    __ATTR_RO(name),
    __ATTR_RO(type),
    __ATTR_RO(modalias),
    __ATTR_NULL
};