C++ (Cpp) i2c_dev_get_by_minorの例

コード例 #1

ファイル: i2c-dev.c プロジェクト: ena30/snake-os

static int i2cdev_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct i2c_client *client;
	struct i2c_adapter *adap;
	struct i2c_dev *i2c_dev;

	i2c_dev = i2c_dev_get_by_minor(minor);
	if (!i2c_dev)
		return -ENODEV;

	adap = i2c_get_adapter(i2c_dev->adap->nr);
	if (!adap)
		return -ENODEV;

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client) {
		i2c_put_adapter(adap);
		return -ENOMEM;
	}
	memcpy(client, &i2cdev_client_template, sizeof(*client));

	/* registered with adapter, passed as client to user */
	client->adapter = adap;
	file->private_data = client;

	return 0;
}

コード例 #2

ファイル: xeno-i2c.c プロジェクト: ozwin/iem-space-invader

/* Initializing i2c driver from the kernel space */
int xeno_i2c_init(void) {
	unsigned int minor = 0;

	struct i2c_adapter *adap;
	struct i2c_dev *i2c_dev;

	i2c_dev = i2c_dev_get_by_minor(minor);
	if (!i2c_dev)
		return -ENODEV;

	adap = i2c_get_adapter(i2c_dev->adap->nr);

	if (!adap)
		return -ENODEV;

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client) {
		i2c_put_adapter(adap);
		return -ENOMEM;
	}
	memcpy(client, &i2cdev_client_template, sizeof(*client));

	/* registered with adapter, passed as client to user */
	client->adapter = adap;

	return 0;
}

コード例 #3

ファイル: i2c-dev.c プロジェクト: ena30/snake-os

static ssize_t show_adapter_name(struct class_device *class_dev, char *buf)
{
	struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(class_dev->devt));

	if (!i2c_dev)
		return -ENODEV;
	return sprintf(buf, "%s\n", i2c_dev->adap->name);
}