static int calibrate_8939()

in qcom/tsens-v0_1.c [282:350]

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

static int calibrate_8939(struct tsens_priv *priv)
{
	int base0 = 0, base1 = 0, i;
	u32 p1[10], p2[10];
	int mode = 0;
	u32 *qfprom_cdata;
	u32 cdata[6];

	qfprom_cdata = (u32 *)qfprom_read(priv->dev, "calib");
	if (IS_ERR(qfprom_cdata))
		return PTR_ERR(qfprom_cdata);

	/* Mapping between qfprom nvmem and calibration data */
	cdata[0] = qfprom_cdata[12];
	cdata[1] = qfprom_cdata[13];
	cdata[2] = qfprom_cdata[0];
	cdata[3] = qfprom_cdata[1];
	cdata[4] = qfprom_cdata[22];
	cdata[5] = qfprom_cdata[21];

	mode = (cdata[0] & MSM8939_CAL_SEL_MASK) >> MSM8939_CAL_SEL_SHIFT;
	dev_dbg(priv->dev, "calibration mode is %d\n", mode);

	switch (mode) {
	case TWO_PT_CALIB:
		base1 = (cdata[3] & MSM8939_BASE1_MASK) >> MSM8939_BASE1_SHIFT;
		p2[0] = (cdata[0] & MSM8939_S0_P2_MASK) >> MSM8939_S0_P2_SHIFT;
		p2[1] = (cdata[0] & MSM8939_S1_P2_MASK) >> MSM8939_S1_P2_SHIFT;
		p2[2] = (cdata[1] & MSM8939_S2_P2_MASK) >> MSM8939_S2_P2_SHIFT;
		p2[3] = (cdata[1] & MSM8939_S3_P2_MASK) >> MSM8939_S3_P2_SHIFT;
		p2[4] = (cdata[1] & MSM8939_S4_P2_MASK) >> MSM8939_S4_P2_SHIFT;
		p2[5] = (cdata[2] & MSM8939_S5_P2_MASK) >> MSM8939_S5_P2_SHIFT;
		p2[6] = (cdata[2] & MSM8939_S6_P2_MASK) >> MSM8939_S6_P2_SHIFT;
		p2[7] = (cdata[3] & MSM8939_S7_P2_MASK) >> MSM8939_S7_P2_SHIFT;
		p2[8] = (cdata[3] & MSM8939_S8_P2_MASK) >> MSM8939_S8_P2_SHIFT;
		p2[9] = (cdata[4] & MSM8939_S9_P2_MASK_0_4) >> MSM8939_S9_P2_SHIFT_0_4;
		p2[9] |= ((cdata[5] & MSM8939_S9_P2_MASK_5) >> MSM8939_S9_P2_SHIFT_5) << 5;
		for (i = 0; i < priv->num_sensors; i++)
			p2[i] = (base1 + p2[i]) << 2;
		fallthrough;
	case ONE_PT_CALIB2:
		base0 = (cdata[2] & MSM8939_BASE0_MASK) >> MSM8939_BASE0_SHIFT;
		p1[0] = (cdata[0] & MSM8939_S0_P1_MASK) >> MSM8939_S0_P1_SHIFT;
		p1[1] = (cdata[0] & MSM8939_S1_P1_MASK) >> MSM8939_S1_P1_SHIFT;
		p1[2] = (cdata[0] & MSM8939_S2_P1_MASK_0_4) >> MSM8939_S2_P1_SHIFT_0_4;
		p1[2] |= ((cdata[1] & MSM8939_S2_P1_MASK_5) >> MSM8939_S2_P1_SHIFT_5) << 5;
		p1[3] = (cdata[1] & MSM8939_S3_P1_MASK) >> MSM8939_S3_P1_SHIFT;
		p1[4] = (cdata[1] & MSM8939_S4_P1_MASK) >> MSM8939_S4_P1_SHIFT;
		p1[5] = (cdata[2] & MSM8939_S5_P1_MASK) >> MSM8939_S5_P1_SHIFT;
		p1[6] = (cdata[2] & MSM8939_S6_P1_MASK) >> MSM8939_S6_P1_SHIFT;
		p1[7] = (cdata[3] & MSM8939_S7_P1_MASK) >> MSM8939_S7_P1_SHIFT;
		p1[8] = (cdata[3] & MSM8939_S8_P1_MASK) >> MSM8939_S8_P1_SHIFT;
		p1[9] = (cdata[4] & MSM8939_S9_P1_MASK) >> MSM8939_S9_P1_SHIFT;
		for (i = 0; i < priv->num_sensors; i++)
			p1[i] = ((base0) + p1[i]) << 2;
		break;
	default:
		for (i = 0; i < priv->num_sensors; i++) {
			p1[i] = 500;
			p2[i] = 780;
		}
		break;
	}

	compute_intercept_slope(priv, p1, p2, mode);
	kfree(qfprom_cdata);

	return 0;
}