iio: adc: Add support for PMIC7 ADC

The ADC architecture on PMIC7 is changed as compared to PMIC5. The
major change from PMIC5 is that all SW communication to ADC goes through
PMK8350, which communicates with other PMICs through PBS when the ADC
on PMK8350 works in master mode. The SID register is used to identify the
PMICs with which the PBS needs to communicate. Add support for the same.

Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 262 insertions, 0 deletions

diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c
index 2bb78d1c4daa..5113aaa6ba67 100644
--- a/drivers/iio/adc/qcom-vadc-common.c
+++ b/drivers/iio/adc/qcom-vadc-common.c
@@ -89,6 +89,195 @@ static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = {
 	{ 46,	125000 },
 };
 
+static const struct vadc_map_pt adcmap7_die_temp[] = {
+	{ 433700, 1967},
+	{ 473100, 1964},
+	{ 512400, 1957},
+	{ 551500, 1949},
+	{ 590500, 1940},
+	{ 629300, 1930},
+	{ 667900, 1921},
+	{ 706400, 1910},
+	{ 744600, 1896},
+	{ 782500, 1878},
+	{ 820100, 1859},
+	{ 857300, 0},
+};
+
+/*
+ * Resistance to temperature table for 100k pull up for NTCG104EF104.
+ */
+static const struct vadc_map_pt adcmap7_100k[] = {
+	{ 4250657, -40960 },
+	{ 3962085, -39936 },
+	{ 3694875, -38912 },
+	{ 3447322, -37888 },
+	{ 3217867, -36864 },
+	{ 3005082, -35840 },
+	{ 2807660, -34816 },
+	{ 2624405, -33792 },
+	{ 2454218, -32768 },
+	{ 2296094, -31744 },
+	{ 2149108, -30720 },
+	{ 2012414, -29696 },
+	{ 1885232, -28672 },
+	{ 1766846, -27648 },
+	{ 1656598, -26624 },
+	{ 1553884, -25600 },
+	{ 1458147, -24576 },
+	{ 1368873, -23552 },
+	{ 1285590, -22528 },
+	{ 1207863, -21504 },
+	{ 1135290, -20480 },
+	{ 1067501, -19456 },
+	{ 1004155, -18432 },
+	{ 944935, -17408 },
+	{ 889550, -16384 },
+	{ 837731, -15360 },
+	{ 789229, -14336 },
+	{ 743813, -13312 },
+	{ 701271, -12288 },
+	{ 661405, -11264 },
+	{ 624032, -10240 },
+	{ 588982, -9216 },
+	{ 556100, -8192 },
+	{ 525239, -7168 },
+	{ 496264, -6144 },
+	{ 469050, -5120 },
+	{ 443480, -4096 },
+	{ 419448, -3072 },
+	{ 396851, -2048 },
+	{ 375597, -1024 },
+	{ 355598, 0 },
+	{ 336775, 1024 },
+	{ 319052, 2048 },
+	{ 302359, 3072 },
+	{ 286630, 4096 },
+	{ 271806, 5120 },
+	{ 257829, 6144 },
+	{ 244646, 7168 },
+	{ 232209, 8192 },
+	{ 220471, 9216 },
+	{ 209390, 10240 },
+	{ 198926, 11264 },
+	{ 189040, 12288 },
+	{ 179698, 13312 },
+	{ 170868, 14336 },
+	{ 162519, 15360 },
+	{ 154622, 16384 },
+	{ 147150, 17408 },
+	{ 140079, 18432 },
+	{ 133385, 19456 },
+	{ 127046, 20480 },
+	{ 121042, 21504 },
+	{ 115352, 22528 },
+	{ 109960, 23552 },
+	{ 104848, 24576 },
+	{ 100000, 25600 },
+	{ 95402, 26624 },
+	{ 91038, 27648 },
+	{ 86897, 28672 },
+	{ 82965, 29696 },
+	{ 79232, 30720 },
+	{ 75686, 31744 },
+	{ 72316, 32768 },
+	{ 69114, 33792 },
+	{ 66070, 34816 },
+	{ 63176, 35840 },
+	{ 60423, 36864 },
+	{ 57804, 37888 },
+	{ 55312, 38912 },
+	{ 52940, 39936 },
+	{ 50681, 40960 },
+	{ 48531, 41984 },
+	{ 46482, 43008 },
+	{ 44530, 44032 },
+	{ 42670, 45056 },
+	{ 40897, 46080 },
+	{ 39207, 47104 },
+	{ 37595, 48128 },
+	{ 36057, 49152 },
+	{ 34590, 50176 },
+	{ 33190, 51200 },
+	{ 31853, 52224 },
+	{ 30577, 53248 },
+	{ 29358, 54272 },
+	{ 28194, 55296 },
+	{ 27082, 56320 },
+	{ 26020, 57344 },
+	{ 25004, 58368 },
+	{ 24033, 59392 },
+	{ 23104, 60416 },
+	{ 22216, 61440 },
+	{ 21367, 62464 },
+	{ 20554, 63488 },
+	{ 19776, 64512 },
+	{ 19031, 65536 },
+	{ 18318, 66560 },
+	{ 17636, 67584 },
+	{ 16982, 68608 },
+	{ 16355, 69632 },
+	{ 15755, 70656 },
+	{ 15180, 71680 },
+	{ 14628, 72704 },
+	{ 14099, 73728 },
+	{ 13592, 74752 },
+	{ 13106, 75776 },
+	{ 12640, 76800 },
+	{ 12192, 77824 },
+	{ 11762, 78848 },
+	{ 11350, 79872 },
+	{ 10954, 80896 },
+	{ 10574, 81920 },
+	{ 10209, 82944 },
+	{ 9858, 83968 },
+	{ 9521, 84992 },
+	{ 9197, 86016 },
+	{ 8886, 87040 },
+	{ 8587, 88064 },
+	{ 8299, 89088 },
+	{ 8023, 90112 },
+	{ 7757, 91136 },
+	{ 7501, 92160 },
+	{ 7254, 93184 },
+	{ 7017, 94208 },
+	{ 6789, 95232 },
+	{ 6570, 96256 },
+	{ 6358, 97280 },
+	{ 6155, 98304 },
+	{ 5959, 99328 },
+	{ 5770, 100352 },
+	{ 5588, 101376 },
+	{ 5412, 102400 },
+	{ 5243, 103424 },
+	{ 5080, 104448 },
+	{ 4923, 105472 },
+	{ 4771, 106496 },
+	{ 4625, 107520 },
+	{ 4484, 108544 },
+	{ 4348, 109568 },
+	{ 4217, 110592 },
+	{ 4090, 111616 },
+	{ 3968, 112640 },
+	{ 3850, 113664 },
+	{ 3736, 114688 },
+	{ 3626, 115712 },
+	{ 3519, 116736 },
+	{ 3417, 117760 },
+	{ 3317, 118784 },
+	{ 3221, 119808 },
+	{ 3129, 120832 },
+	{ 3039, 121856 },
+	{ 2952, 122880 },
+	{ 2868, 123904 },
+	{ 2787, 124928 },
+	{ 2709, 125952 },
+	{ 2633, 126976 },
+	{ 2560, 128000 },
+	{ 2489, 129024 },
+	{ 2420, 130048 }
+};
+
 static int qcom_vadc_scale_hw_calib_volt(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,
@@ -97,6 +286,10 @@ static int qcom_vadc_scale_hw_calib_therm(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,
 				u16 adc_code, int *result_mdec);
+static int qcom_vadc7_scale_hw_calib_therm(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec);
 static int qcom_vadc_scale_hw_smb_temp(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,
@@ -109,12 +302,20 @@ static int qcom_vadc_scale_hw_calib_die_temp(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,
 				u16 adc_code, int *result_mdec);
+static int qcom_vadc7_scale_hw_calib_die_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec);
 
 static struct qcom_adc5_scale_type scale_adc5_fn[] = {
 	[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
 	[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
 	[SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm},
+	[SCALE_HW_CALIB_THERM_100K_PU_PM7] = {
+					qcom_vadc7_scale_hw_calib_therm},
 	[SCALE_HW_CALIB_PMIC_THERM] = {qcom_vadc_scale_hw_calib_die_temp},
+	[SCALE_HW_CALIB_PMIC_THERM_PM7] = {
+					qcom_vadc7_scale_hw_calib_die_temp},
 	[SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp},
 	[SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp},
 };
@@ -291,6 +492,32 @@ static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
 	return (int) voltage;
 }
 
+static int qcom_vadc7_scale_hw_calib_therm(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec)
+{
+	s64 resistance = adc_code;
+	int ret, result;
+
+	if (adc_code >= RATIO_MAX_ADC7)
+		return -EINVAL;
+
+	/* (ADC code * R_PULLUP (100Kohm)) / (full_scale_code - ADC code)*/
+	resistance *= R_PU_100K;
+	resistance = div64_s64(resistance, RATIO_MAX_ADC7 - adc_code);
+
+	ret = qcom_vadc_map_voltage_temp(adcmap7_100k,
+				 ARRAY_SIZE(adcmap7_100k),
+				 resistance, &result);
+	if (ret)
+		return ret;
+
+	*result_mdec = result;
+
+	return 0;
+}
+
 static int qcom_vadc_scale_hw_calib_volt(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,
@@ -330,6 +557,41 @@ static int qcom_vadc_scale_hw_calib_die_temp(
 	return 0;
 }
 
+static int qcom_vadc7_scale_hw_calib_die_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec)
+{
+
+	int voltage, vtemp0, temp, i;
+
+	voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
+				prescale, data, 1);
+
+	if (adcmap7_die_temp[0].x > voltage) {
+		*result_mdec = DIE_TEMP_ADC7_SCALE_1;
+		return 0;
+	}
+
+	if (adcmap7_die_temp[ARRAY_SIZE(adcmap7_die_temp) - 1].x <= voltage) {
+		*result_mdec = DIE_TEMP_ADC7_MAX;
+		return 0;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(adcmap7_die_temp); i++)
+		if (adcmap7_die_temp[i].x > voltage)
+			break;
+
+	vtemp0 = adcmap7_die_temp[i - 1].x;
+	voltage = voltage - vtemp0;
+	temp = div64_s64(voltage * DIE_TEMP_ADC7_SCALE_FACTOR,
+		adcmap7_die_temp[i - 1].y);
+	temp += DIE_TEMP_ADC7_SCALE_1 + (DIE_TEMP_ADC7_SCALE_2 * (i - 1));
+	*result_mdec = temp;
+
+	return 0;
+}
+
 static int qcom_vadc_scale_hw_smb_temp(
 				const struct vadc_prescale_ratio *prescale,
 				const struct adc5_data *data,