atm/adummy: add syfs DEVICE_ATTR to change signal (c69fb76e) · Commits · 戴 / test

drivers/atm/adummy.c

+39 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,42 @@ struct adummy_dev {

		static LIST_HEAD(adummy_devs);

		static ssize_t __set_signal(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t len)
		{
		struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
		int signal;

		if (sscanf(buf, "%d", &signal) == 1) {

		if (signal < ATM_PHY_SIG_LOST \|\| signal > ATM_PHY_SIG_FOUND)
		signal = ATM_PHY_SIG_UNKNOWN;

		atm_dev_signal_change(atm_dev, signal);
		return 1;
		}
		return -EINVAL;
		}

		static ssize_t __show_signal(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
		return sprintf(buf, "%d\n", atm_dev->signal);
		}
		static DEVICE_ATTR(signal, 0644, __show_signal, __set_signal);

		static struct attribute *adummy_attrs[] = {
		&dev_attr_signal.attr,
		NULL
		};

		static struct attribute_group adummy_group_attrs = {
		.name = NULL, /* We want them in dev's root folder */
		.attrs = adummy_attrs
		};

		static int __init
		adummy_start(struct atm_dev *dev)
		{
		@@ -128,6 +164,9 @@ static int __init adummy_init(void)
		adummy_dev->atm_dev = atm_dev;
		atm_dev->dev_data = adummy_dev;

		if (sysfs_create_group(&atm_dev->class_dev.kobj, &adummy_group_attrs))
		dev_err(&atm_dev->class_dev, "Could not register attrs for adummy\n");

		if (adummy_start(atm_dev)) {
		printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
		err = -ENODEV;