static int trf7970a_in_config_rf_tech()

in trf7970a.c [1169:1227]

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

static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
{
	int ret = 0;

	dev_dbg(trf->dev, "rf technology: %d\n", tech);

	switch (tech) {
	case NFC_DIGITAL_RF_TECH_106A:
		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
		trf->modulator_sys_clk_ctrl =
		    (trf->modulator_sys_clk_ctrl & 0xf8) |
		    TRF7970A_MODULATOR_DEPTH_OOK;
		trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
		break;
	case NFC_DIGITAL_RF_TECH_106B:
		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
		trf->modulator_sys_clk_ctrl =
		    (trf->modulator_sys_clk_ctrl & 0xf8) |
		    TRF7970A_MODULATOR_DEPTH_ASK10;
		trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
		break;
	case NFC_DIGITAL_RF_TECH_212F:
		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
		trf->modulator_sys_clk_ctrl =
		    (trf->modulator_sys_clk_ctrl & 0xf8) |
		    TRF7970A_MODULATOR_DEPTH_ASK10;
		trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
		break;
	case NFC_DIGITAL_RF_TECH_424F:
		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
		trf->modulator_sys_clk_ctrl =
		    (trf->modulator_sys_clk_ctrl & 0xf8) |
		    TRF7970A_MODULATOR_DEPTH_ASK10;
		trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
		break;
	case NFC_DIGITAL_RF_TECH_ISO15693:
		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
		trf->modulator_sys_clk_ctrl =
		    (trf->modulator_sys_clk_ctrl & 0xf8) |
		    TRF7970A_MODULATOR_DEPTH_OOK;
		trf->guard_time = TRF7970A_GUARD_TIME_15693;
		break;
	default:
		dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
		return -EINVAL;
	}

	trf->technology = tech;

	/* If in initiator mode and not changing the RF tech due to a
	 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
	 * trf7970a_init()), clear the NFC Target Detection Level register
	 * due to erratum.
	 */
	if (trf->iso_ctrl == 0xff)
		ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);

	return ret;
}