bar_resolve/sysfs.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sysfs.h>

#include <linux/pcidriver.h>

#include "mod.h"
#include "dev.h"
#include "debug.h"


static ssize_t test_request_show(struct device *dev, struct device_attribute *attr, char *buf) {
    test_dev_t *test = dev_get_drvdata(dev);

    return sprintf(buf, "%lx\n", test->addr);
}

static ssize_t test_request_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) {
    unsigned long ua;

    test_dev_t *test = dev_get_drvdata(dev);

    if (sscanf(buf, "%lx", &ua) != 1) {
	mod_info("Error processing request\n");
	return 0;
    }

    test->addr = pcidriver_resolve_bar(ua);

    return count;
}

static DEVICE_ATTR(test_request, 0664, test_request_show, test_request_store);



int test_sysfs_init(test_dev_t *dev) {
    int err;

    err = device_create_file(dev->dev, &dev_attr_test_request);

    return err;
}

void test_sysfs_free(test_dev_t *dev) {
    device_remove_file(dev->dev, &dev_attr_test_request);
}