static int st95hf_select_protocol()

in st95hf/core.c [375:449]

• 63 lines of code
• 9 McCabe index (conditional complexity)

static int st95hf_select_protocol(struct st95hf_context *stcontext, int type)
{
	int result = 0;
	struct device *dev;

	dev = &stcontext->nfcdev->dev;

	switch (type) {
	case NFC_DIGITAL_RF_TECH_106A:
		stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106A;
		result = st95hf_send_recv_cmd(stcontext,
					      CMD_ISO14443A_PROTOCOL_SELECT,
					      0,
					      NULL,
					      true);
		if (result) {
			dev_err(dev, "protocol sel, err = 0x%x\n",
				result);
			return result;
		}

		/* secondary config. for 14443Type 4A after protocol select */
		result = secondary_configuration_type4a(stcontext);
		if (result) {
			dev_err(dev, "type a secondary config, err = 0x%x\n",
				result);
			return result;
		}
		break;
	case NFC_DIGITAL_RF_TECH_106B:
		stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106B;
		result = st95hf_send_recv_cmd(stcontext,
					      CMD_ISO14443B_PROTOCOL_SELECT,
					      0,
					      NULL,
					      true);
		if (result) {
			dev_err(dev, "protocol sel send, err = 0x%x\n",
				result);
			return result;
		}

		/*
		 * delay of 5-6 ms is required after select protocol
		 * command in case of ISO14443 Type B
		 */
		usleep_range(50000, 60000);

		/* secondary config. for 14443Type 4B after protocol select */
		result = secondary_configuration_type4b(stcontext);
		if (result) {
			dev_err(dev, "type b secondary config, err = 0x%x\n",
				result);
			return result;
		}
		break;
	case NFC_DIGITAL_RF_TECH_ISO15693:
		stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_ISO15693;
		result = st95hf_send_recv_cmd(stcontext,
					      CMD_ISO15693_PROTOCOL_SELECT,
					      0,
					      NULL,
					      true);
		if (result) {
			dev_err(dev, "protocol sel send, err = 0x%x\n",
				result);
			return result;
		}
		break;
	default:
		return -EINVAL;
	}

	return 0;
}