static int w1_eprom_add_slave()

in slaves/w1_ds250x.c [165:216]

• 47 lines of code
• 7 McCabe index (conditional complexity)

static int w1_eprom_add_slave(struct w1_slave *sl)
{
	struct w1_eprom_data *data;
	struct nvmem_device *nvmem;
	struct nvmem_config nvmem_cfg = {
		.dev = &sl->dev,
		.reg_read = w1_nvmem_read,
		.type = NVMEM_TYPE_OTP,
		.read_only = true,
		.word_size = 1,
		.priv = sl,
		.id = -1
	};

	data = devm_kzalloc(&sl->dev, sizeof(struct w1_eprom_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	sl->family_data = data;
	switch (sl->family->fid) {
	case W1_DS2501_UNW_FAMILY:
		data->size = W1_DS2501_SIZE;
		data->read = w1_ds2502_read_page;
		break;
	case W1_DS2502_FAMILY:
	case W1_DS2502_UNW_FAMILY:
		data->size = W1_DS2502_SIZE;
		data->read = w1_ds2502_read_page;
		break;
	case W1_DS2505_FAMILY:
		data->size = W1_DS2505_SIZE;
		data->read = w1_ds2505_read_page;
		break;
	}

	if (sl->master->bus_master->dev_id)
		snprintf(data->nvmem_name, sizeof(data->nvmem_name),
			 "%s-%02x-%012llx",
			 sl->master->bus_master->dev_id, sl->reg_num.family,
			 (unsigned long long)sl->reg_num.id);
	else
		snprintf(data->nvmem_name, sizeof(data->nvmem_name),
			 "%02x-%012llx",
			 sl->reg_num.family,
			 (unsigned long long)sl->reg_num.id);

	nvmem_cfg.name = data->nvmem_name;
	nvmem_cfg.size = data->size;

	nvmem = devm_nvmem_register(&sl->dev, &nvmem_cfg);
	return PTR_ERR_OR_ZERO(nvmem);
}