static unsigned int sm5502_muic_get_cable_type()

in extcon-sm5502.c [361:469]

• 91 lines of code
• 40 McCabe index (conditional complexity)

static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
{
	unsigned int cable_type, adc, dev_type1;
	int ret;

	/* Read ADC value according to external cable or button */
	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
	if (ret) {
		dev_err(info->dev, "failed to read ADC register\n");
		return ret;
	}

	/*
	 * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
	 * connected with to MUIC device.
	 */
	cable_type = adc & SM5502_REG_ADC_MASK;

	switch (cable_type) {
	case SM5502_MUIC_ADC_GROUND:
		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
				  &dev_type1);
		if (ret) {
			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
			return ret;
		}

		if (dev_type1 == info->type->otg_dev_type1) {
			cable_type = SM5502_MUIC_ADC_GROUND_USB_OTG;
		} else {
			dev_dbg(info->dev,
				"cannot identify the cable type: adc(0x%x), dev_type1(0x%x)\n",
				adc, dev_type1);
			return -EINVAL;
		}
		break;
	case SM5502_MUIC_ADC_SEND_END_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
	case SM5502_MUIC_ADC_RESERVED_ACC_1:
	case SM5502_MUIC_ADC_RESERVED_ACC_2:
	case SM5502_MUIC_ADC_RESERVED_ACC_3:
	case SM5502_MUIC_ADC_RESERVED_ACC_4:
	case SM5502_MUIC_ADC_RESERVED_ACC_5:
	case SM5502_MUIC_ADC_AUDIO_TYPE2:
	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
	case SM5502_MUIC_ADC_TTY_CONVERTER:
	case SM5502_MUIC_ADC_UART_CABLE:
	case SM5502_MUIC_ADC_TYPE1_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
	case SM5502_MUIC_ADC_TYPE2_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
		break;
	case SM5502_MUIC_ADC_AUDIO_TYPE1:
		/*
		 * Check whether cable type is
		 * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
		 * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
		 * by using Button event.
		 */
		break;
	case SM5502_MUIC_ADC_OPEN:
		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
				  &dev_type1);
		if (ret) {
			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
			return ret;
		}

		if (dev_type1 == info->type->otg_dev_type1) {
			cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
			break;
		}

		switch (dev_type1) {
		case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
			cable_type = SM5502_MUIC_ADC_OPEN_USB;
			break;
		case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
			cable_type = SM5502_MUIC_ADC_OPEN_TA;
			break;
		default:
			dev_dbg(info->dev,
				"cannot identify the cable type: adc(0x%x)\n",
				adc);
			return -EINVAL;
		}
		break;
	default:
		dev_err(info->dev,
			"failed to identify the cable type: adc(0x%x)\n", adc);
		return -EINVAL;
	}

	return cable_type;
}