iio: adc: Add QCOM SPMI PMIC5 ADC driver

This patch adds support for QCOM SPMI PMIC5 family
of ADC driver that supports hardware based offset and
gain compensation. The ADC peripheral can measure both
voltage and current channels whose input signal is
connected to the PMIC ADC AMUX.

The register set and configuration has been refreshed
compared to the prior QCOM PMIC ADC family. Register
ADC5 as part of the IIO framework.
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/Kconfig

@@ -596,6 +596,26 @@ config QCOM_SPMI_VADC
 	  To compile this driver as a module, choose M here: the module will
 	  be called qcom-spmi-vadc.
 
+config QCOM_SPMI_ADC5
+	tristate "Qualcomm Technologies Inc. SPMI PMIC5 ADC"
+	depends on SPMI
+	select REGMAP_SPMI
+	select QCOM_VADC_COMMON
+	help
+	  This is the IIO Voltage PMIC5 ADC driver for Qualcomm Technologies Inc.
+
+	  The driver supports multiple channels read. The ADC is a 16-bit
+	  sigma-delta ADC. The hardware supports calibrated results for
+	  conversion requests and clients include reading voltage phone
+	  power, on board system thermistors connected to the PMIC ADC,
+	  PMIC die temperature, charger temperature, battery current, USB voltage
+	  input, voltage signals connected to supported PMIC GPIO inputs. The
+	  hardware supports internal pull-up for thermistors and can choose between
+	  a 100k, 30k and 400k pull up using the ADC channels.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called qcom-spmi-adc5.
+
 config RCAR_GYRO_ADC
 	tristate "Renesas R-Car GyroADC driver"
 	depends on ARCH_RCAR_GEN2 || COMPILE_TEST

drivers/iio/adc/Makefile

@@ -53,6 +53,7 @@ obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
 obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
 obj-$(CONFIG_NAU7802) += nau7802.o
 obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
+obj-$(CONFIG_QCOM_SPMI_ADC5) += qcom-spmi-adc5.o
 obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
 obj-$(CONFIG_QCOM_VADC_COMMON) += qcom-vadc-common.o
 obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o

drivers/iio/adc/qcom-spmi-adc5.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/iio/qcom,spmi-vadc.h>
+#include "qcom-vadc-common.h"
+
+#define ADC5_USR_REVISION1			0x0
+#define ADC5_USR_STATUS1			0x8
+#define ADC5_USR_STATUS1_REQ_STS		BIT(1)
+#define ADC5_USR_STATUS1_EOC			BIT(0)
+#define ADC5_USR_STATUS1_REQ_STS_EOC_MASK	0x3
+
+#define ADC5_USR_STATUS2			0x9
+#define ADC5_USR_STATUS2_CONV_SEQ_MASK		0x70
+#define ADC5_USR_STATUS2_CONV_SEQ_MASK_SHIFT	0x5
+
+#define ADC5_USR_IBAT_MEAS			0xf
+#define ADC5_USR_IBAT_MEAS_SUPPORTED		BIT(0)
+
+#define ADC5_USR_DIG_PARAM			0x42
+#define ADC5_USR_DIG_PARAM_CAL_VAL		BIT(6)
+#define ADC5_USR_DIG_PARAM_CAL_VAL_SHIFT	6
+#define ADC5_USR_DIG_PARAM_CAL_SEL		0x30
+#define ADC5_USR_DIG_PARAM_CAL_SEL_SHIFT	4
+#define ADC5_USR_DIG_PARAM_DEC_RATIO_SEL	0xc
+#define ADC5_USR_DIG_PARAM_DEC_RATIO_SEL_SHIFT	2
+
+#define ADC5_USR_FAST_AVG_CTL			0x43
+#define ADC5_USR_FAST_AVG_CTL_EN		BIT(7)
+#define ADC5_USR_FAST_AVG_CTL_SAMPLES_MASK	0x7
+
+#define ADC5_USR_CH_SEL_CTL			0x44
+
+#define ADC5_USR_DELAY_CTL			0x45
+#define ADC5_USR_HW_SETTLE_DELAY_MASK		0xf
+
+#define ADC5_USR_EN_CTL1			0x46
+#define ADC5_USR_EN_CTL1_ADC_EN			BIT(7)
+
+#define ADC5_USR_CONV_REQ			0x47
+#define ADC5_USR_CONV_REQ_REQ			BIT(7)
+
+#define ADC5_USR_DATA0				0x50
+
+#define ADC5_USR_DATA1				0x51
+
+#define ADC5_USR_IBAT_DATA0			0x52
+
+#define ADC5_USR_IBAT_DATA1			0x53
+
+/*
+ * Conversion time varies based on the decimation, clock rate, fast average
+ * samples and measurements queued across different VADC peripherals.
+ * Set the timeout to a max of 100ms.
+ */
+#define ADC5_CONV_TIME_MIN_US			263
+#define ADC5_CONV_TIME_MAX_US			264
+#define ADC5_CONV_TIME_RETRY			400
+#define ADC5_CONV_TIMEOUT			msecs_to_jiffies(100)
+
+/* Digital version >= 5.3 supports hw_settle_2 */
+#define ADC5_HW_SETTLE_DIFF_MINOR		3
+#define ADC5_HW_SETTLE_DIFF_MAJOR		5
+
+enum adc5_cal_method {
+	ADC5_NO_CAL = 0,
+	ADC5_RATIOMETRIC_CAL,
+	ADC5_ABSOLUTE_CAL
+};
+
+enum adc5_cal_val {
+	ADC5_TIMER_CAL = 0,
+	ADC5_NEW_CAL
+};
+
+/**
+ * struct adc5_channel_prop - ADC channel property.
+ * @channel: channel number, refer to the channel list.
+ * @cal_method: calibration method.
+ * @cal_val: calibration value
+ * @decimation: sampling rate supported for the channel.
+ * @prescale: channel scaling performed on the input signal.
+ * @hw_settle_time: the time between AMUX being configured and the
+ *	start of conversion.
+ * @avg_samples: ability to provide single result from the ADC
+ *	that is an average of multiple measurements.
+ * @scale_fn_type: Represents the scaling function to convert voltage
+ *	physical units desired by the client for the channel.
+ * @datasheet_name: Channel name used in device tree.
+ */
+struct adc5_channel_prop {
+	unsigned int		channel;
+	enum adc5_cal_method	cal_method;
+	enum adc5_cal_val	cal_val;
+	unsigned int		decimation;
+	unsigned int		prescale;
+	unsigned int		hw_settle_time;
+	unsigned int		avg_samples;
+	enum vadc_scale_fn_type	scale_fn_type;
+	const char		*datasheet_name;
+};
+
+/**
+ * struct adc5_chip - ADC private structure.
+ * @regmap: SPMI ADC5 peripheral register map field.
+ * @dev: SPMI ADC5 device.
+ * @base: base address for the ADC peripheral.
+ * @nchannels: number of ADC channels.
+ * @chan_props: array of ADC channel properties.
+ * @iio_chans: array of IIO channels specification.
+ * @poll_eoc: use polling instead of interrupt.
+ * @complete: ADC result notification after interrupt is received.
+ * @lock: ADC lock for access to the peripheral.
+ * @data: software configuration data.
+ */
+struct adc5_chip {
+	struct regmap		*regmap;
+	struct device		*dev;
+	u16			base;
+	unsigned int		nchannels;
+	struct adc5_channel_prop	*chan_props;
+	struct iio_chan_spec	*iio_chans;
+	bool			poll_eoc;
+	struct completion	complete;
+	struct mutex		lock;
+	const struct adc5_data	*data;
+};
+
+static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
+	{.num =  1, .den =  1},
+	{.num =  1, .den =  3},
+	{.num =  1, .den =  4},
+	{.num =  1, .den =  6},
+	{.num =  1, .den = 20},
+	{.num =  1, .den =  8},
+	{.num = 10, .den = 81},
+	{.num =  1, .den = 10},
+	{.num =  1, .den = 16}
+};
+
+static int adc5_read(struct adc5_chip *adc, u16 offset, u8 *data, int len)
+{
+	return regmap_bulk_read(adc->regmap, adc->base + offset, data, len);
+}
+
+static int adc5_write(struct adc5_chip *adc, u16 offset, u8 *data, int len)
+{
+	return regmap_bulk_write(adc->regmap, adc->base + offset, data, len);
+}
+
+static int adc5_prescaling_from_dt(u32 num, u32 den)
+{
+	unsigned int pre;
+
+	for (pre = 0; pre < ARRAY_SIZE(adc5_prescale_ratios); pre++)
+		if (adc5_prescale_ratios[pre].num == num &&
+		    adc5_prescale_ratios[pre].den == den)
+			break;
+
+	if (pre == ARRAY_SIZE(adc5_prescale_ratios))
+		return -EINVAL;
+
+	return pre;
+}
+
+static int adc5_hw_settle_time_from_dt(u32 value,
+					const unsigned int *hw_settle)
+{
+	unsigned int i;
+
+	for (i = 0; i < VADC_HW_SETTLE_SAMPLES_MAX; i++) {
+		if (value == hw_settle[i])
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int adc5_avg_samples_from_dt(u32 value)
+{
+	if (!is_power_of_2(value) || value > ADC5_AVG_SAMPLES_MAX)
+		return -EINVAL;
+
+	return __ffs(value);
+}
+
+static int adc5_decimation_from_dt(u32 value,
+					const unsigned int *decimation)
+{
+	unsigned int i;
+
+	for (i = 0; i < ADC5_DECIMATION_SAMPLES_MAX; i++) {
+		if (value == decimation[i])
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int adc5_read_voltage_data(struct adc5_chip *adc, u16 *data)
+{
+	int ret;
+	u8 rslt_lsb, rslt_msb;
+
+	ret = adc5_read(adc, ADC5_USR_DATA0, &rslt_lsb, sizeof(rslt_lsb));
+	if (ret)
+		return ret;
+
+	ret = adc5_read(adc, ADC5_USR_DATA1, &rslt_msb, sizeof(rslt_lsb));
+	if (ret)
+		return ret;
+
+	*data = (rslt_msb << 8) | rslt_lsb;
+
+	if (*data == ADC5_USR_DATA_CHECK) {
+		pr_err("Invalid data:0x%x\n", *data);
+		return -EINVAL;
+	}
+
+	pr_debug("voltage raw code:0x%x\n", *data);
+
+	return 0;
+}
+
+static int adc5_poll_wait_eoc(struct adc5_chip *adc)
+{
+	unsigned int count, retry = ADC5_CONV_TIME_RETRY;
+	u8 status1;
+	int ret;
+
+	for (count = 0; count < retry; count++) {
+		ret = adc5_read(adc, ADC5_USR_STATUS1, &status1,
+							sizeof(status1));
+		if (ret)
+			return ret;
+
+		status1 &= ADC5_USR_STATUS1_REQ_STS_EOC_MASK;
+		if (status1 == ADC5_USR_STATUS1_EOC)
+			return 0;
+
+		usleep_range(ADC5_CONV_TIME_MIN_US, ADC5_CONV_TIME_MAX_US);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static void adc5_update_dig_param(struct adc5_chip *adc,
+			struct adc5_channel_prop *prop, u8 *data)
+{
+	/* Update calibration value */
+	*data &= ~ADC5_USR_DIG_PARAM_CAL_VAL;
+	*data |= (prop->cal_val << ADC5_USR_DIG_PARAM_CAL_VAL_SHIFT);
+
+	/* Update calibration select */
+	*data &= ~ADC5_USR_DIG_PARAM_CAL_SEL;
+	*data |= (prop->cal_method << ADC5_USR_DIG_PARAM_CAL_SEL_SHIFT);
+
+	/* Update decimation ratio select */
+	*data &= ~ADC5_USR_DIG_PARAM_DEC_RATIO_SEL;
+	*data |= (prop->decimation << ADC5_USR_DIG_PARAM_DEC_RATIO_SEL_SHIFT);
+}
+
+static int adc5_configure(struct adc5_chip *adc,
+			struct adc5_channel_prop *prop)
+{
+	int ret;
+	u8 buf[6];
+
+	/* Read registers 0x42 through 0x46 */
+	ret = adc5_read(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	/* Digital param selection */
+	adc5_update_dig_param(adc, prop, &buf[0]);
+
+	/* Update fast average sample value */
+	buf[1] &= (u8) ~ADC5_USR_FAST_AVG_CTL_SAMPLES_MASK;
+	buf[1] |= prop->avg_samples;
+
+	/* Select ADC channel */
+	buf[2] = prop->channel;
+
+	/* Select HW settle delay for channel */
+	buf[3] &= (u8) ~ADC5_USR_HW_SETTLE_DELAY_MASK;
+	buf[3] |= prop->hw_settle_time;
+
+	/* Select ADC enable */
+	buf[4] |= ADC5_USR_EN_CTL1_ADC_EN;
+
+	/* Select CONV request */
+	buf[5] |= ADC5_USR_CONV_REQ_REQ;
+
+	if (!adc->poll_eoc)
+		reinit_completion(&adc->complete);
+
+	return adc5_write(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
+}
+
+static int adc5_do_conversion(struct adc5_chip *adc,
+			struct adc5_channel_prop *prop,
+			struct iio_chan_spec const *chan,
+			u16 *data_volt, u16 *data_cur)
+{
+	int ret;
+
+	mutex_lock(&adc->lock);
+
+	ret = adc5_configure(adc, prop);
+	if (ret) {
+		pr_err("ADC configure failed with %d\n", ret);
+		goto unlock;
+	}
+
+	if (adc->poll_eoc) {
+		ret = adc5_poll_wait_eoc(adc);
+		if (ret < 0) {
+			pr_err("EOC bit not set\n");
+			goto unlock;
+		}
+	} else {
+		ret = wait_for_completion_timeout(&adc->complete,
+							ADC5_CONV_TIMEOUT);
+		if (!ret) {
+			pr_debug("Did not get completion timeout.\n");
+			ret = adc5_poll_wait_eoc(adc);
+			if (ret < 0) {
+				pr_err("EOC bit not set\n");
+				goto unlock;
+			}
+		}
+	}
+
+	ret = adc5_read_voltage_data(adc, data_volt);
+unlock:
+	mutex_unlock(&adc->lock);
+
+	return ret;
+}
+
+static irqreturn_t adc5_isr(int irq, void *dev_id)
+{
+	struct adc5_chip *adc = dev_id;
+
+	complete(&adc->complete);
+
+	return IRQ_HANDLED;
+}
+
+static int adc5_of_xlate(struct iio_dev *indio_dev,
+				const struct of_phandle_args *iiospec)
+{
+	struct adc5_chip *adc = iio_priv(indio_dev);
+	int i;
+
+	for (i = 0; i < adc->nchannels; i++)
+		if (adc->chan_props[i].channel == iiospec->args[0])
+			return i;
+
+	return -EINVAL;
+}
+
+static int adc5_read_raw(struct iio_dev *indio_dev,
+			 struct iio_chan_spec const *chan, int *val, int *val2,
+			 long mask)
+{
+	struct adc5_chip *adc = iio_priv(indio_dev);
+	struct adc5_channel_prop *prop;
+	u16 adc_code_volt, adc_code_cur;
+	int ret;
+
+	prop = &adc->chan_props[chan->address];
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		ret = adc5_do_conversion(adc, prop, chan,
+				&adc_code_volt, &adc_code_cur);
+		if (ret)
+			return ret;
+
+		ret = qcom_adc5_hw_scale(prop->scale_fn_type,
+			&adc5_prescale_ratios[prop->prescale],
+			adc->data,
+			adc_code_volt, val);
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct iio_info adc5_info = {
+	.read_raw = adc5_read_raw,
+	.of_xlate = adc5_of_xlate,
+};
+
+struct adc5_channels {
+	const char *datasheet_name;
+	unsigned int prescale_index;
+	enum iio_chan_type type;
+	long info_mask;
+	enum vadc_scale_fn_type scale_fn_type;
+};
+
+#define ADC5_CHAN(_dname, _type, _mask, _pre, _scale)			\
+	{								\
+		.datasheet_name = _dname,				\
+		.prescale_index = _pre,					\
+		.type = _type,						\
+		.info_mask = _mask,					\
+		.scale_fn_type = _scale,				\
+	},								\
+
+#define ADC5_CHAN_TEMP(_dname, _pre, _scale)				\
+	ADC5_CHAN(_dname, IIO_TEMP,					\
+		BIT(IIO_CHAN_INFO_PROCESSED),				\
+		_pre, _scale)						\
+
+#define ADC5_CHAN_VOLT(_dname, _pre, _scale)				\
+	ADC5_CHAN(_dname, IIO_VOLTAGE,					\
+		  BIT(IIO_CHAN_INFO_PROCESSED),				\
+		  _pre, _scale)						\
+
+static const struct adc5_channels adc5_chans_pmic[ADC5_MAX_CHANNEL] = {
+	[ADC5_REF_GND]		= ADC5_CHAN_VOLT("ref_gnd", 1,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_1P25VREF]		= ADC5_CHAN_VOLT("vref_1p25", 1,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_VPH_PWR]		= ADC5_CHAN_VOLT("vph_pwr", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_VBAT_SNS]		= ADC5_CHAN_VOLT("vbat_sns", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_DIE_TEMP]		= ADC5_CHAN_TEMP("die_temp", 1,
+					SCALE_HW_CALIB_PMIC_THERM)
+	[ADC5_USB_IN_I]		= ADC5_CHAN_VOLT("usb_in_i_uv", 1,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_USB_IN_V_16]	= ADC5_CHAN_VOLT("usb_in_v_div_16", 16,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_CHG_TEMP]		= ADC5_CHAN_TEMP("chg_temp", 1,
+					SCALE_HW_CALIB_PM5_CHG_TEMP)
+	/* Charger prescales SBUx and MID_CHG to fit within 1.8V upper unit */
+	[ADC5_SBUx]		= ADC5_CHAN_VOLT("chg_sbux", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_MID_CHG_DIV6]	= ADC5_CHAN_VOLT("chg_mid_chg", 6,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_XO_THERM_100K_PU]	= ADC5_CHAN_TEMP("xo_therm", 1,
+					SCALE_HW_CALIB_XOTHERM)
+	[ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_AMUX_THM2]	= ADC5_CHAN_TEMP("amux_thm2", 1,
+					SCALE_HW_CALIB_PM5_SMB_TEMP)
+};
+
+static const struct adc5_channels adc5_chans_rev2[ADC5_MAX_CHANNEL] = {
+	[ADC5_REF_GND]		= ADC5_CHAN_VOLT("ref_gnd", 1,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_1P25VREF]		= ADC5_CHAN_VOLT("vref_1p25", 1,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_VPH_PWR]		= ADC5_CHAN_VOLT("vph_pwr", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_VBAT_SNS]		= ADC5_CHAN_VOLT("vbat_sns", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_VCOIN]		= ADC5_CHAN_VOLT("vcoin", 3,
+					SCALE_HW_CALIB_DEFAULT)
+	[ADC5_DIE_TEMP]		= ADC5_CHAN_TEMP("die_temp", 1,
+					SCALE_HW_CALIB_PMIC_THERM)
+	[ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_AMUX_THM5_100K_PU] = ADC5_CHAN_TEMP("amux_thm5_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC5_XO_THERM_100K_PU]	= ADC5_CHAN_TEMP("xo_therm_100k_pu", 1,
+					SCALE_HW_CALIB_THERM_100K_PULLUP)
+};
+
+static int adc5_get_dt_channel_data(struct adc5_chip *adc,
+				    struct adc5_channel_prop *prop,
+				    struct device_node *node,
+				    const struct adc5_data *data)
+{
+	const char *name = node->name, *channel_name;
+	u32 chan, value, varr[2];
+	int ret;
+	struct device *dev = adc->dev;
+
+	ret = of_property_read_u32(node, "reg", &chan);
+	if (ret) {
+		dev_err(dev, "invalid channel number %s\n", name);
+		return ret;
+	}
+
+	if (chan > ADC5_PARALLEL_ISENSE_VBAT_IDATA) {
+		dev_err(dev, "%s invalid channel number %d\n", name, chan);
+		return -EINVAL;
+	}
+
+	/* the channel has DT description */
+	prop->channel = chan;
+
+	channel_name = of_get_property(node,
+				"label", NULL) ? : node->name;
+	if (!channel_name) {
+		pr_err("Invalid channel name\n");
+		return -EINVAL;
+	}
+	prop->datasheet_name = channel_name;
+
+	ret = of_property_read_u32(node, "qcom,decimation", &value);
+	if (!ret) {
+		ret = adc5_decimation_from_dt(value, data->decimation);
+		if (ret < 0) {
+			dev_err(dev, "%02x invalid decimation %d\n",
+				chan, value);
+			return ret;
+		}
+		prop->decimation = ret;
+	} else {
+		prop->decimation = ADC5_DECIMATION_DEFAULT;
+	}
+
+	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
+	if (!ret) {
+		ret = adc5_prescaling_from_dt(varr[0], varr[1]);
+		if (ret < 0) {
+			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
+				chan, varr[0], varr[1]);
+			return ret;
+		}
+		prop->prescale = ret;
+	}
+
+	ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
+	if (!ret) {
+		u8 dig_version[2];
+
+		ret = adc5_read(adc, ADC5_USR_REVISION1, dig_version,
+							sizeof(dig_version));
+		if (ret < 0) {
+			dev_err(dev, "Invalid dig version read %d\n", ret);
+			return ret;
+		}
+
+		pr_debug("dig_ver:minor:%d, major:%d\n", dig_version[0],
+						dig_version[1]);
+		/* Digital controller >= 5.3 have hw_settle_2 option */
+		if (dig_version[0] >= ADC5_HW_SETTLE_DIFF_MINOR &&
+			dig_version[1] >= ADC5_HW_SETTLE_DIFF_MAJOR)
+			ret = adc5_hw_settle_time_from_dt(value,
+							data->hw_settle_2);
+		else
+			ret = adc5_hw_settle_time_from_dt(value,
+							data->hw_settle_1);
+
+		if (ret < 0) {
+			dev_err(dev, "%02x invalid hw-settle-time %d us\n",
+				chan, value);
+			return ret;
+		}
+		prop->hw_settle_time = ret;
+	} else {
+		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
+	}
+
+	ret = of_property_read_u32(node, "qcom,avg-samples", &value);
+	if (!ret) {
+		ret = adc5_avg_samples_from_dt(value);
+		if (ret < 0) {
+			dev_err(dev, "%02x invalid avg-samples %d\n",
+				chan, value);
+			return ret;
+		}
+		prop->avg_samples = ret;
+	} else {
+		prop->avg_samples = VADC_DEF_AVG_SAMPLES;
+	}
+
+	if (of_property_read_bool(node, "qcom,ratiometric"))
+		prop->cal_method = ADC5_RATIOMETRIC_CAL;
+	else
+		prop->cal_method = ADC5_ABSOLUTE_CAL;
+
+	/*
+	 * Default to using timer calibration. Using a fresh calibration value
+	 * for every conversion will increase the overall time for a request.
+	 */
+	prop->cal_val = ADC5_TIMER_CAL;
+
+	dev_dbg(dev, "%02x name %s\n", chan, name);
+
+	return 0;
+}
+
+static const struct adc5_data adc5_data_pmic = {
+	.full_scale_code_volt = 0x70e4,
+	.full_scale_code_cur = 0x2710,
+	.adc_chans = adc5_chans_pmic,
+	.decimation = (unsigned int [ADC5_DECIMATION_SAMPLES_MAX])
+				{250, 420, 840},
+	.hw_settle_1 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
+				{15, 100, 200, 300, 400, 500, 600, 700,
+				800, 900, 1, 2, 4, 6, 8, 10},
+	.hw_settle_2 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
+				{15, 100, 200, 300, 400, 500, 600, 700,
+				1, 2, 4, 8, 16, 32, 64, 128},
+};
+
+static const struct adc5_data adc5_data_pmic_rev2 = {
+	.full_scale_code_volt = 0x4000,
+	.full_scale_code_cur = 0x1800,
+	.adc_chans = adc5_chans_rev2,
+	.decimation = (unsigned int [ADC5_DECIMATION_SAMPLES_MAX])
+				{256, 512, 1024},
+	.hw_settle_1 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
+				{0, 100, 200, 300, 400, 500, 600, 700,
+				800, 900, 1, 2, 4, 6, 8, 10},
+	.hw_settle_2 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
+				{15, 100, 200, 300, 400, 500, 600, 700,
+				1, 2, 4, 8, 16, 32, 64, 128},
+};
+
+static const struct of_device_id adc5_match_table[] = {
+	{
+		.compatible = "qcom,spmi-adc5",
+		.data = &adc5_data_pmic,
+	},
+	{
+		.compatible = "qcom,spmi-adc-rev2",
+		.data = &adc5_data_pmic_rev2,
+	},
+	{ }
+};
+
+static int adc5_get_dt_data(struct adc5_chip *adc, struct device_node *node)
+{
+	const struct adc5_channels *adc_chan;
+	struct iio_chan_spec *iio_chan;
+	struct adc5_channel_prop prop, *chan_props;
+	struct device_node *child;
+	unsigned int index = 0;
+	const struct of_device_id *id;
+	const struct adc5_data *data;
+	int ret;
+
+	adc->nchannels = of_get_available_child_count(node);
+	if (!adc->nchannels)
+		return -EINVAL;
+
+	adc->iio_chans = devm_kcalloc(adc->dev, adc->nchannels,
+				       sizeof(*adc->iio_chans), GFP_KERNEL);
+	if (!adc->iio_chans)
+		return -ENOMEM;
+
+	adc->chan_props = devm_kcalloc(adc->dev, adc->nchannels,
+					sizeof(*adc->chan_props), GFP_KERNEL);
+	if (!adc->chan_props)
+		return -ENOMEM;
+
+	chan_props = adc->chan_props;
+	iio_chan = adc->iio_chans;
+	id = of_match_node(adc5_match_table, node);
+	if (id)
+		data = id->data;
+	else
+		data = &adc5_data_pmic;
+	adc->data = data;
+
+	for_each_available_child_of_node(node, child) {
+		ret = adc5_get_dt_channel_data(adc, &prop, child, data);
+		if (ret) {
+			of_node_put(child);
+			return ret;
+		}
+
+		prop.scale_fn_type =
+			data->adc_chans[prop.channel].scale_fn_type;
+		*chan_props = prop;
+		adc_chan = &data->adc_chans[prop.channel];
+
+		iio_chan->channel = prop.channel;
+		iio_chan->datasheet_name = prop.datasheet_name;
+		iio_chan->extend_name = prop.datasheet_name;
+		iio_chan->info_mask_separate = adc_chan->info_mask;
+		iio_chan->type = adc_chan->type;
+		iio_chan->address = index;
+		iio_chan++;
+		chan_props++;
+		index++;
+	}
+
+	return 0;
+}
+
+static int adc5_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct iio_dev *indio_dev;
+	struct adc5_chip *adc;
+	struct regmap *regmap;
+	int ret, irq_eoc;
+	u32 reg;
+
+	regmap = dev_get_regmap(dev->parent, NULL);
+	if (!regmap)
+		return -ENODEV;
+
+	ret = of_property_read_u32(node, "reg", &reg);
+	if (ret < 0)
+		return ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	adc = iio_priv(indio_dev);
+	adc->regmap = regmap;
+	adc->dev = dev;
+	adc->base = reg;
+	init_completion(&adc->complete);
+	mutex_init(&adc->lock);
+
+	ret = adc5_get_dt_data(adc, node);
+	if (ret) {
+		pr_err("adc get dt data failed\n");
+		return ret;
+	}
+
+	irq_eoc = platform_get_irq(pdev, 0);
+	if (irq_eoc < 0) {
+		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
+			return irq_eoc;
+		adc->poll_eoc = true;
+	} else {
+		ret = devm_request_irq(dev, irq_eoc, adc5_isr, 0,
+				       "pm-adc5", adc);
+		if (ret)
+			return ret;
+	}
+
+	indio_dev->dev.parent = dev;
+	indio_dev->dev.of_node = node;
+	indio_dev->name = pdev->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &adc5_info;
+	indio_dev->channels = adc->iio_chans;
+	indio_dev->num_channels = adc->nchannels;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct platform_driver adc5_driver = {
+	.driver = {
+		.name = "qcom-spmi-adc5.c",
+		.of_match_table = adc5_match_table,
+	},
+	.probe = adc5_probe,
+};
+module_platform_driver(adc5_driver);
+
+MODULE_ALIAS("platform:qcom-spmi-adc5");
+MODULE_DESCRIPTION("Qualcomm Technologies Inc. PMIC5 ADC driver");
+MODULE_LICENSE("GPL v2");

drivers/iio/adc/qcom-vadc-common.c

@@ -47,8 +47,79 @@ static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
 	{44,	125}
 };
 
+/*
+ * Voltage to temperature table for 100k pull up for NTCG104EF104 with
+ * 1.875V reference.
+ */
+static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = {
+	{ 1831,	-40000 },
+	{ 1814,	-35000 },
+	{ 1791,	-30000 },
+	{ 1761,	-25000 },
+	{ 1723,	-20000 },
+	{ 1675,	-15000 },
+	{ 1616,	-10000 },
+	{ 1545,	-5000 },
+	{ 1463,	0 },
+	{ 1370,	5000 },
+	{ 1268,	10000 },
+	{ 1160,	15000 },
+	{ 1049,	20000 },
+	{ 937,	25000 },
+	{ 828,	30000 },
+	{ 726,	35000 },
+	{ 630,	40000 },
+	{ 544,	45000 },
+	{ 467,	50000 },
+	{ 399,	55000 },
+	{ 340,	60000 },
+	{ 290,	65000 },
+	{ 247,	70000 },
+	{ 209,	75000 },
+	{ 179,	80000 },
+	{ 153,	85000 },
+	{ 130,	90000 },
+	{ 112,	95000 },
+	{ 96,	100000 },
+	{ 82,	105000 },
+	{ 71,	110000 },
+	{ 62,	115000 },
+	{ 53,	120000 },
+	{ 46,	125000 },
+};
+
+static int qcom_vadc_scale_hw_calib_volt(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_uv);
+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_vadc_scale_hw_smb_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec);
+static int qcom_vadc_scale_hw_chg5_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec);
+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 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_PMIC_THERM] = {qcom_vadc_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},
+};
+
 static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
-				      u32 tablesize, s32 input, s64 *output)
+				      u32 tablesize, s32 input, int *output)
 {
 	bool descending = 1;
 	u32 i = 0;
@@ -128,7 +199,7 @@ static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
 				 bool absolute, u16 adc_code,
 				 int *result_mdec)
 {
-	s64 voltage = 0, result = 0;
+	s64 voltage = 0;
 	int ret;
 
 	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
@@ -138,12 +209,11 @@ static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
 
 	ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
 					 ARRAY_SIZE(adcmap_100k_104ef_104fb),
-					 voltage, &result);
+					 voltage, result_mdec);
 	if (ret)
 		return ret;
 
-	result *= 1000;
-	*result_mdec = result;
+	*result_mdec *= 1000;
 
 	return 0;
 }
@@ -191,6 +261,99 @@ static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
 	return 0;
 }
 
+static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				unsigned int factor)
+{
+	s64 voltage, temp, adc_vdd_ref_mv = 1875;
+
+	/*
+	 * The normal data range is between 0V to 1.875V. On cases where
+	 * we read low voltage values, the ADC code can go beyond the
+	 * range and the scale result is incorrect so we clamp the values
+	 * for the cases where the code represents a value below 0V
+	 */
+	if (adc_code > VADC5_MAX_CODE)
+		adc_code = 0;
+
+	/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
+	voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;
+	voltage = div64_s64(voltage, data->full_scale_code_volt);
+	if (voltage > 0) {
+		voltage *= prescale->den;
+		temp = prescale->num * factor;
+		voltage = div64_s64(voltage, temp);
+	} else {
+		voltage = 0;
+	}
+
+	return (int) voltage;
+}
+
+static int qcom_vadc_scale_hw_calib_volt(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_uv)
+{
+	*result_uv = qcom_vadc_scale_code_voltage_factor(adc_code,
+				prescale, data, 1);
+
+	return 0;
+}
+
+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)
+{
+	int voltage;
+
+	voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
+				prescale, data, 1000);
+
+	/* Map voltage to temperature from look-up table */
+	return qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb_1875_vref,
+				 ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
+				 voltage, result_mdec);
+}
+
+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)
+{
+	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
+				prescale, data, 2);
+	*result_mdec -= KELVINMIL_CELSIUSMIL;
+
+	return 0;
+}
+
+static int qcom_vadc_scale_hw_smb_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec)
+{
+	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code * 100,
+				prescale, data, PMIC5_SMB_TEMP_SCALE_FACTOR);
+	*result_mdec = PMIC5_SMB_TEMP_CONSTANT - *result_mdec;
+
+	return 0;
+}
+
+static int qcom_vadc_scale_hw_chg5_temp(
+				const struct vadc_prescale_ratio *prescale,
+				const struct adc5_data *data,
+				u16 adc_code, int *result_mdec)
+{
+	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
+				prescale, data, 4);
+	*result_mdec = PMIC5_CHG_TEMP_SCALE_FACTOR - *result_mdec;
+
+	return 0;
+}
+
 int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
 		    const struct vadc_linear_graph *calib_graph,
 		    const struct vadc_prescale_ratio *prescale,
@@ -221,6 +384,22 @@ int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
 }
 EXPORT_SYMBOL(qcom_vadc_scale);
 
+int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
+		    const struct vadc_prescale_ratio *prescale,
+		    const struct adc5_data *data,
+		    u16 adc_code, int *result)
+{
+	if (!(scaletype >= SCALE_HW_CALIB_DEFAULT &&
+		scaletype < SCALE_HW_CALIB_INVALID)) {
+		pr_err("Invalid scale type %d\n", scaletype);
+		return -EINVAL;
+	}
+
+	return scale_adc5_fn[scaletype].scale_fn(prescale, data,
+					adc_code, result);
+}
+EXPORT_SYMBOL(qcom_adc5_hw_scale);
+
 int qcom_vadc_decimation_from_dt(u32 value)
 {
 	if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||

drivers/iio/adc/qcom-vadc-common.h

@@ -25,15 +25,31 @@
 
 #define VADC_DECIMATION_MIN			512
 #define VADC_DECIMATION_MAX			4096
+#define ADC5_DEF_VBAT_PRESCALING		1 /* 1:3 */
+#define ADC5_DECIMATION_SHORT			250
+#define ADC5_DECIMATION_MEDIUM			420
+#define ADC5_DECIMATION_LONG			840
+/* Default decimation - 1024 for rev2, 840 for pmic5 */
+#define ADC5_DECIMATION_DEFAULT			2
+#define ADC5_DECIMATION_SAMPLES_MAX		3
 
 #define VADC_HW_SETTLE_DELAY_MAX		10000
+#define VADC_HW_SETTLE_SAMPLES_MAX		16
 #define VADC_AVG_SAMPLES_MAX			512
+#define ADC5_AVG_SAMPLES_MAX			16
 
 #define KELVINMIL_CELSIUSMIL			273150
+#define PMIC5_CHG_TEMP_SCALE_FACTOR		377500
+#define PMIC5_SMB_TEMP_CONSTANT			419400
+#define PMIC5_SMB_TEMP_SCALE_FACTOR		356
 
 #define PMI_CHG_SCALE_1				-138890
 #define PMI_CHG_SCALE_2				391750000000LL
 
+#define VADC5_MAX_CODE				0x7fff
+#define ADC5_FULL_SCALE_CODE			0x70e4
+#define ADC5_USR_DATA_CHECK			0x8000
+
 /**
  * struct vadc_map_pt - Map the graph representation for ADC channel
  * @x: Represent the ADC digitized code.
@@ -89,6 +105,18 @@ struct vadc_prescale_ratio {
  * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
  * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
  * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
+ * SCALE_HW_CALIB_DEFAULT: Default scaling to convert raw adc code to
+ *	voltage (uV) with hardware applied offset/slope values to adc code.
+ * SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using
+ *	lookup table. The hardware applies offset/slope to adc code.
+ * SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using
+ *	100k pullup. The hardware applies offset/slope to adc code.
+ * SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
+ *	The hardware applies offset/slope to adc code.
+ * SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5
+ *	charger temperature.
+ * SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5
+ *	SMB1390 temperature.
  */
 enum vadc_scale_fn_type {
 	SCALE_DEFAULT = 0,
@@ -96,6 +124,22 @@ enum vadc_scale_fn_type {
 	SCALE_PMIC_THERM,
 	SCALE_XOTHERM,
 	SCALE_PMI_CHG_TEMP,
+	SCALE_HW_CALIB_DEFAULT,
+	SCALE_HW_CALIB_THERM_100K_PULLUP,
+	SCALE_HW_CALIB_XOTHERM,
+	SCALE_HW_CALIB_PMIC_THERM,
+	SCALE_HW_CALIB_PM5_CHG_TEMP,
+	SCALE_HW_CALIB_PM5_SMB_TEMP,
+	SCALE_HW_CALIB_INVALID,
+};
+
+struct adc5_data {
+	const u32	full_scale_code_volt;
+	const u32	full_scale_code_cur;
+	const struct adc5_channels *adc_chans;
+	unsigned int	*decimation;
+	unsigned int	*hw_settle_1;
+	unsigned int	*hw_settle_2;
 };
 
 int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
@@ -104,6 +148,16 @@ int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
 		    bool absolute,
 		    u16 adc_code, int *result_mdec);
 
+struct qcom_adc5_scale_type {
+	int (*scale_fn)(const struct vadc_prescale_ratio *prescale,
+		const struct adc5_data *data, u16 adc_code, int *result);
+};
+
+int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
+		    const struct vadc_prescale_ratio *prescale,
+		    const struct adc5_data *data,
+		    u16 adc_code, int *result_mdec);
+
 int qcom_vadc_decimation_from_dt(u32 value);
 
 #endif /* QCOM_VADC_COMMON_H */