Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1022 insertions, 0 deletions

diff --git a/drivers/iio/adc/qcom-spmi-rradc.c b/drivers/iio/adc/qcom-spmi-rradc.c
new file mode 100644
index 000000000..56a713766
--- /dev/null
+++ b/drivers/iio/adc/qcom-spmi-rradc.c
@@ -0,0 +1,1022 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016-2017, 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Linaro Limited.
+ *  Author: Caleb Connolly <caleb.connolly@linaro.org>
+ *
+ * This driver is for the Round Robin ADC found in the pmi8998 and pm660 PMICs.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/spmi.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <asm/unaligned.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+
+#include <soc/qcom/qcom-spmi-pmic.h>
+
+#define DRIVER_NAME "qcom-spmi-rradc"
+
+#define RR_ADC_EN_CTL 0x46
+#define RR_ADC_SKIN_TEMP_LSB 0x50
+#define RR_ADC_SKIN_TEMP_MSB 0x51
+#define RR_ADC_CTL 0x52
+#define RR_ADC_CTL_CONTINUOUS_SEL BIT(3)
+#define RR_ADC_LOG 0x53
+#define RR_ADC_LOG_CLR_CTRL BIT(0)
+
+#define RR_ADC_FAKE_BATT_LOW_LSB 0x58
+#define RR_ADC_FAKE_BATT_LOW_MSB 0x59
+#define RR_ADC_FAKE_BATT_HIGH_LSB 0x5A
+#define RR_ADC_FAKE_BATT_HIGH_MSB 0x5B
+
+#define RR_ADC_BATT_ID_CTRL 0x60
+#define RR_ADC_BATT_ID_CTRL_CHANNEL_CONV BIT(0)
+#define RR_ADC_BATT_ID_TRIGGER 0x61
+#define RR_ADC_BATT_ID_STS 0x62
+#define RR_ADC_BATT_ID_CFG 0x63
+#define BATT_ID_SETTLE_MASK GENMASK(7, 5)
+#define RR_ADC_BATT_ID_5_LSB 0x66
+#define RR_ADC_BATT_ID_5_MSB 0x67
+#define RR_ADC_BATT_ID_15_LSB 0x68
+#define RR_ADC_BATT_ID_15_MSB 0x69
+#define RR_ADC_BATT_ID_150_LSB 0x6A
+#define RR_ADC_BATT_ID_150_MSB 0x6B
+
+#define RR_ADC_BATT_THERM_CTRL 0x70
+#define RR_ADC_BATT_THERM_TRIGGER 0x71
+#define RR_ADC_BATT_THERM_STS 0x72
+#define RR_ADC_BATT_THERM_CFG 0x73
+#define RR_ADC_BATT_THERM_LSB 0x74
+#define RR_ADC_BATT_THERM_MSB 0x75
+#define RR_ADC_BATT_THERM_FREQ 0x76
+
+#define RR_ADC_AUX_THERM_CTRL 0x80
+#define RR_ADC_AUX_THERM_TRIGGER 0x81
+#define RR_ADC_AUX_THERM_STS 0x82
+#define RR_ADC_AUX_THERM_CFG 0x83
+#define RR_ADC_AUX_THERM_LSB 0x84
+#define RR_ADC_AUX_THERM_MSB 0x85
+
+#define RR_ADC_SKIN_HOT 0x86
+#define RR_ADC_SKIN_TOO_HOT 0x87
+
+#define RR_ADC_AUX_THERM_C1 0x88
+#define RR_ADC_AUX_THERM_C2 0x89
+#define RR_ADC_AUX_THERM_C3 0x8A
+#define RR_ADC_AUX_THERM_HALF_RANGE 0x8B
+
+#define RR_ADC_USB_IN_V_CTRL 0x90
+#define RR_ADC_USB_IN_V_TRIGGER 0x91
+#define RR_ADC_USB_IN_V_STS 0x92
+#define RR_ADC_USB_IN_V_LSB 0x94
+#define RR_ADC_USB_IN_V_MSB 0x95
+#define RR_ADC_USB_IN_I_CTRL 0x98
+#define RR_ADC_USB_IN_I_TRIGGER 0x99
+#define RR_ADC_USB_IN_I_STS 0x9A
+#define RR_ADC_USB_IN_I_LSB 0x9C
+#define RR_ADC_USB_IN_I_MSB 0x9D
+
+#define RR_ADC_DC_IN_V_CTRL 0xA0
+#define RR_ADC_DC_IN_V_TRIGGER 0xA1
+#define RR_ADC_DC_IN_V_STS 0xA2
+#define RR_ADC_DC_IN_V_LSB 0xA4
+#define RR_ADC_DC_IN_V_MSB 0xA5
+#define RR_ADC_DC_IN_I_CTRL 0xA8
+#define RR_ADC_DC_IN_I_TRIGGER 0xA9
+#define RR_ADC_DC_IN_I_STS 0xAA
+#define RR_ADC_DC_IN_I_LSB 0xAC
+#define RR_ADC_DC_IN_I_MSB 0xAD
+
+#define RR_ADC_PMI_DIE_TEMP_CTRL 0xB0
+#define RR_ADC_PMI_DIE_TEMP_TRIGGER 0xB1
+#define RR_ADC_PMI_DIE_TEMP_STS 0xB2
+#define RR_ADC_PMI_DIE_TEMP_CFG 0xB3
+#define RR_ADC_PMI_DIE_TEMP_LSB 0xB4
+#define RR_ADC_PMI_DIE_TEMP_MSB 0xB5
+
+#define RR_ADC_CHARGER_TEMP_CTRL 0xB8
+#define RR_ADC_CHARGER_TEMP_TRIGGER 0xB9
+#define RR_ADC_CHARGER_TEMP_STS 0xBA
+#define RR_ADC_CHARGER_TEMP_CFG 0xBB
+#define RR_ADC_CHARGER_TEMP_LSB 0xBC
+#define RR_ADC_CHARGER_TEMP_MSB 0xBD
+#define RR_ADC_CHARGER_HOT 0xBE
+#define RR_ADC_CHARGER_TOO_HOT 0xBF
+
+#define RR_ADC_GPIO_CTRL 0xC0
+#define RR_ADC_GPIO_TRIGGER 0xC1
+#define RR_ADC_GPIO_STS 0xC2
+#define RR_ADC_GPIO_LSB 0xC4
+#define RR_ADC_GPIO_MSB 0xC5
+
+#define RR_ADC_ATEST_CTRL 0xC8
+#define RR_ADC_ATEST_TRIGGER 0xC9
+#define RR_ADC_ATEST_STS 0xCA
+#define RR_ADC_ATEST_LSB 0xCC
+#define RR_ADC_ATEST_MSB 0xCD
+#define RR_ADC_SEC_ACCESS 0xD0
+
+#define RR_ADC_PERPH_RESET_CTL2 0xD9
+#define RR_ADC_PERPH_RESET_CTL3 0xDA
+#define RR_ADC_PERPH_RESET_CTL4 0xDB
+#define RR_ADC_INT_TEST1 0xE0
+#define RR_ADC_INT_TEST_VAL 0xE1
+
+#define RR_ADC_TM_TRIGGER_CTRLS 0xE2
+#define RR_ADC_TM_ADC_CTRLS 0xE3
+#define RR_ADC_TM_CNL_CTRL 0xE4
+#define RR_ADC_TM_BATT_ID_CTRL 0xE5
+#define RR_ADC_TM_THERM_CTRL 0xE6
+#define RR_ADC_TM_CONV_STS 0xE7
+#define RR_ADC_TM_ADC_READ_LSB 0xE8
+#define RR_ADC_TM_ADC_READ_MSB 0xE9
+#define RR_ADC_TM_ATEST_MUX_1 0xEA
+#define RR_ADC_TM_ATEST_MUX_2 0xEB
+#define RR_ADC_TM_REFERENCES 0xED
+#define RR_ADC_TM_MISC_CTL 0xEE
+#define RR_ADC_TM_RR_CTRL 0xEF
+
+#define RR_ADC_TRIGGER_EVERY_CYCLE BIT(7)
+#define RR_ADC_TRIGGER_CTL BIT(0)
+
+#define RR_ADC_BATT_ID_RANGE 820
+
+#define RR_ADC_BITS 10
+#define RR_ADC_CHAN_MSB (1 << RR_ADC_BITS)
+#define RR_ADC_FS_VOLTAGE_MV 2500
+
+/* BATT_THERM 0.25K/LSB */
+#define RR_ADC_BATT_THERM_LSB_K 4
+
+#define RR_ADC_TEMP_FS_VOLTAGE_NUM 5000000
+#define RR_ADC_TEMP_FS_VOLTAGE_DEN 3
+#define RR_ADC_DIE_TEMP_OFFSET 601400
+#define RR_ADC_DIE_TEMP_SLOPE 2
+#define RR_ADC_DIE_TEMP_OFFSET_MILLI_DEGC 25000
+
+#define RR_ADC_CHG_TEMP_GF_OFFSET_UV 1303168
+#define RR_ADC_CHG_TEMP_GF_SLOPE_UV_PER_C 3784
+#define RR_ADC_CHG_TEMP_SMIC_OFFSET_UV 1338433
+#define RR_ADC_CHG_TEMP_SMIC_SLOPE_UV_PER_C 3655
+#define RR_ADC_CHG_TEMP_660_GF_OFFSET_UV 1309001
+#define RR_ADC_CHG_TEMP_660_GF_SLOPE_UV_PER_C 3403
+#define RR_ADC_CHG_TEMP_660_SMIC_OFFSET_UV 1295898
+#define RR_ADC_CHG_TEMP_660_SMIC_SLOPE_UV_PER_C 3596
+#define RR_ADC_CHG_TEMP_660_MGNA_OFFSET_UV 1314779
+#define RR_ADC_CHG_TEMP_660_MGNA_SLOPE_UV_PER_C 3496
+#define RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC 25000
+#define RR_ADC_CHG_THRESHOLD_SCALE 4
+
+#define RR_ADC_VOLT_INPUT_FACTOR 8
+#define RR_ADC_CURR_INPUT_FACTOR 2000
+#define RR_ADC_CURR_USBIN_INPUT_FACTOR_MIL 1886
+#define RR_ADC_CURR_USBIN_660_FACTOR_MIL 9
+#define RR_ADC_CURR_USBIN_660_UV_VAL 579500
+
+#define RR_ADC_GPIO_FS_RANGE 5000
+#define RR_ADC_COHERENT_CHECK_RETRY 5
+#define RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN 16
+
+#define RR_ADC_STS_CHANNEL_READING_MASK GENMASK(1, 0)
+#define RR_ADC_STS_CHANNEL_STS BIT(1)
+
+#define RR_ADC_TP_REV_VERSION1 21
+#define RR_ADC_TP_REV_VERSION2 29
+#define RR_ADC_TP_REV_VERSION3 32
+
+#define RRADC_BATT_ID_DELAY_MAX 8
+
+enum rradc_channel_id {
+	RR_ADC_BATT_ID = 0,
+	RR_ADC_BATT_THERM,
+	RR_ADC_SKIN_TEMP,
+	RR_ADC_USBIN_I,
+	RR_ADC_USBIN_V,
+	RR_ADC_DCIN_I,
+	RR_ADC_DCIN_V,
+	RR_ADC_DIE_TEMP,
+	RR_ADC_CHG_TEMP,
+	RR_ADC_GPIO,
+	RR_ADC_CHAN_MAX
+};
+
+struct rradc_chip;
+
+/**
+ * struct rradc_channel - rradc channel data
+ * @label:		channel label
+ * @lsb:		Channel least significant byte
+ * @status:		Channel status address
+ * @size:		number of bytes to read
+ * @trigger_addr:	Trigger address, trigger is only used on some channels
+ * @trigger_mask:	Trigger mask
+ * @scale_fn:		Post process callback for channels which can't be exposed
+ *			as offset + scale.
+ */
+struct rradc_channel {
+	const char *label;
+	u8 lsb;
+	u8 status;
+	int size;
+	int trigger_addr;
+	int trigger_mask;
+	int (*scale_fn)(struct rradc_chip *chip, u16 adc_code, int *result);
+};
+
+struct rradc_chip {
+	struct device *dev;
+	const struct qcom_spmi_pmic *pmic;
+	/*
+	 * Lock held while doing channel conversion
+	 * involving multiple register read/writes
+	 */
+	struct mutex conversion_lock;
+	struct regmap *regmap;
+	u32 base;
+	int batt_id_delay;
+	u16 batt_id_data;
+};
+
+static const int batt_id_delays[] = { 0, 1, 4, 12, 20, 40, 60, 80 };
+static const struct rradc_channel rradc_chans[RR_ADC_CHAN_MAX];
+static const struct iio_chan_spec rradc_iio_chans[RR_ADC_CHAN_MAX];
+
+static int rradc_read(struct rradc_chip *chip, u16 addr, __le16 *buf, int len)
+{
+	int ret, retry_cnt = 0;
+	__le16 data_check[RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN / 2];
+
+	if (len > RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN) {
+		dev_err(chip->dev,
+			"Can't read more than %d bytes, but asked to read %d bytes.\n",
+			RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN, len);
+		return -EINVAL;
+	}
+
+	while (retry_cnt < RR_ADC_COHERENT_CHECK_RETRY) {
+		ret = regmap_bulk_read(chip->regmap, chip->base + addr, buf,
+				       len);
+		if (ret < 0) {
+			dev_err(chip->dev, "rr_adc reg 0x%x failed :%d\n", addr,
+				ret);
+			return ret;
+		}
+
+		ret = regmap_bulk_read(chip->regmap, chip->base + addr,
+				       data_check, len);
+		if (ret < 0) {
+			dev_err(chip->dev, "rr_adc reg 0x%x failed :%d\n", addr,
+				ret);
+			return ret;
+		}
+
+		if (memcmp(buf, data_check, len) != 0) {
+			retry_cnt++;
+			dev_dbg(chip->dev,
+				"coherent read error, retry_cnt:%d\n",
+				retry_cnt);
+			continue;
+		}
+
+		break;
+	}
+
+	if (retry_cnt == RR_ADC_COHERENT_CHECK_RETRY)
+		dev_err(chip->dev, "Retry exceeded for coherency check\n");
+
+	return ret;
+}
+
+static int rradc_get_fab_coeff(struct rradc_chip *chip, int64_t *offset,
+			       int64_t *slope)
+{
+	if (chip->pmic->subtype == PM660_SUBTYPE) {
+		switch (chip->pmic->fab_id) {
+		case PM660_FAB_ID_GF:
+			*offset = RR_ADC_CHG_TEMP_660_GF_OFFSET_UV;
+			*slope = RR_ADC_CHG_TEMP_660_GF_SLOPE_UV_PER_C;
+			return 0;
+		case PM660_FAB_ID_TSMC:
+			*offset = RR_ADC_CHG_TEMP_660_SMIC_OFFSET_UV;
+			*slope = RR_ADC_CHG_TEMP_660_SMIC_SLOPE_UV_PER_C;
+			return 0;
+		default:
+			*offset = RR_ADC_CHG_TEMP_660_MGNA_OFFSET_UV;
+			*slope = RR_ADC_CHG_TEMP_660_MGNA_SLOPE_UV_PER_C;
+		}
+	} else if (chip->pmic->subtype == PMI8998_SUBTYPE) {
+		switch (chip->pmic->fab_id) {
+		case PMI8998_FAB_ID_GF:
+			*offset = RR_ADC_CHG_TEMP_GF_OFFSET_UV;
+			*slope = RR_ADC_CHG_TEMP_GF_SLOPE_UV_PER_C;
+			return 0;
+		case PMI8998_FAB_ID_SMIC:
+			*offset = RR_ADC_CHG_TEMP_SMIC_OFFSET_UV;
+			*slope = RR_ADC_CHG_TEMP_SMIC_SLOPE_UV_PER_C;
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * These functions explicitly cast int64_t to int.
+ * They will never overflow, as the values are small enough.
+ */
+static int rradc_post_process_batt_id(struct rradc_chip *chip, u16 adc_code,
+				      int *result_ohms)
+{
+	uint32_t current_value;
+	int64_t r_id;
+
+	current_value = chip->batt_id_data;
+	r_id = ((int64_t)adc_code * RR_ADC_FS_VOLTAGE_MV);
+	r_id = div64_s64(r_id, (RR_ADC_CHAN_MSB * current_value));
+	*result_ohms = (int)(r_id * MILLI);
+
+	return 0;
+}
+
+static int rradc_enable_continuous_mode(struct rradc_chip *chip)
+{
+	int ret;
+
+	/* Clear channel log */
+	ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_LOG,
+				 RR_ADC_LOG_CLR_CTRL, RR_ADC_LOG_CLR_CTRL);
+	if (ret < 0) {
+		dev_err(chip->dev, "log ctrl update to clear failed:%d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_LOG,
+				 RR_ADC_LOG_CLR_CTRL, 0);
+	if (ret < 0) {
+		dev_err(chip->dev, "log ctrl update to not clear failed:%d\n",
+			ret);
+		return ret;
+	}
+
+	/* Switch to continuous mode */
+	ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_CTL,
+				 RR_ADC_CTL_CONTINUOUS_SEL,
+				 RR_ADC_CTL_CONTINUOUS_SEL);
+	if (ret < 0)
+		dev_err(chip->dev, "Update to continuous mode failed:%d\n",
+			ret);
+
+	return ret;
+}
+
+static int rradc_disable_continuous_mode(struct rradc_chip *chip)
+{
+	int ret;
+
+	/* Switch to non continuous mode */
+	ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_CTL,
+				 RR_ADC_CTL_CONTINUOUS_SEL, 0);
+	if (ret < 0)
+		dev_err(chip->dev, "Update to non-continuous mode failed:%d\n",
+			ret);
+
+	return ret;
+}
+
+static bool rradc_is_ready(struct rradc_chip *chip,
+			   enum rradc_channel_id chan_address)
+{
+	const struct rradc_channel *chan = &rradc_chans[chan_address];
+	int ret;
+	unsigned int status, mask;
+
+	/* BATT_ID STS bit does not get set initially */
+	switch (chan_address) {
+	case RR_ADC_BATT_ID:
+		mask = RR_ADC_STS_CHANNEL_STS;
+		break;
+	default:
+		mask = RR_ADC_STS_CHANNEL_READING_MASK;
+		break;
+	}
+
+	ret = regmap_read(chip->regmap, chip->base + chan->status, &status);
+	if (ret < 0 || !(status & mask))
+		return false;
+
+	return true;
+}
+
+static int rradc_read_status_in_cont_mode(struct rradc_chip *chip,
+					  enum rradc_channel_id chan_address)
+{
+	const struct rradc_channel *chan = &rradc_chans[chan_address];
+	const struct iio_chan_spec *iio_chan = &rradc_iio_chans[chan_address];
+	int ret, i;
+
+	if (chan->trigger_mask == 0) {
+		dev_err(chip->dev, "Channel doesn't have a trigger mask\n");
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(chip->regmap, chip->base + chan->trigger_addr,
+				 chan->trigger_mask, chan->trigger_mask);
+	if (ret < 0) {
+		dev_err(chip->dev,
+			"Failed to apply trigger for channel '%s' ret=%d\n",
+			iio_chan->extend_name, ret);
+		return ret;
+	}
+
+	ret = rradc_enable_continuous_mode(chip);
+	if (ret < 0) {
+		dev_err(chip->dev, "Failed to switch to continuous mode\n");
+		goto disable_trigger;
+	}
+
+	/*
+	 * The wait/sleep values were found through trial and error,
+	 * this is mostly for the battery ID channel which takes some
+	 * time to settle.
+	 */
+	for (i = 0; i < 5; i++) {
+		if (rradc_is_ready(chip, chan_address))
+			break;
+		usleep_range(50000, 50000 + 500);
+	}
+
+	if (i == 5) {
+		dev_err(chip->dev, "Channel '%s' is not ready\n",
+			iio_chan->extend_name);
+		ret = -ETIMEDOUT;
+	}
+
+	rradc_disable_continuous_mode(chip);
+
+disable_trigger:
+	regmap_update_bits(chip->regmap, chip->base + chan->trigger_addr,
+			   chan->trigger_mask, 0);
+
+	return ret;
+}
+
+static int rradc_prepare_batt_id_conversion(struct rradc_chip *chip,
+					    enum rradc_channel_id chan_address,
+					    u16 *data)
+{
+	int ret;
+
+	ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_CTRL,
+				 RR_ADC_BATT_ID_CTRL_CHANNEL_CONV,
+				 RR_ADC_BATT_ID_CTRL_CHANNEL_CONV);
+	if (ret < 0) {
+		dev_err(chip->dev, "Enabling BATT ID channel failed:%d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_update_bits(chip->regmap,
+				 chip->base + RR_ADC_BATT_ID_TRIGGER,
+				 RR_ADC_TRIGGER_CTL, RR_ADC_TRIGGER_CTL);
+	if (ret < 0) {
+		dev_err(chip->dev, "BATT_ID trigger set failed:%d\n", ret);
+		goto out_disable_batt_id;
+	}
+
+	ret = rradc_read_status_in_cont_mode(chip, chan_address);
+
+	/* Reset registers back to default values */
+	regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_TRIGGER,
+			   RR_ADC_TRIGGER_CTL, 0);
+
+out_disable_batt_id:
+	regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_CTRL,
+			   RR_ADC_BATT_ID_CTRL_CHANNEL_CONV, 0);
+
+	return ret;
+}
+
+static int rradc_do_conversion(struct rradc_chip *chip,
+			       enum rradc_channel_id chan_address, u16 *data)
+{
+	const struct rradc_channel *chan = &rradc_chans[chan_address];
+	const struct iio_chan_spec *iio_chan = &rradc_iio_chans[chan_address];
+	int ret;
+	__le16 buf[3];
+
+	mutex_lock(&chip->conversion_lock);
+
+	switch (chan_address) {
+	case RR_ADC_BATT_ID:
+		ret = rradc_prepare_batt_id_conversion(chip, chan_address, data);
+		if (ret < 0) {
+			dev_err(chip->dev, "Battery ID conversion failed:%d\n",
+				ret);
+			goto unlock_out;
+		}
+		break;
+
+	case RR_ADC_USBIN_V:
+	case RR_ADC_DIE_TEMP:
+		ret = rradc_read_status_in_cont_mode(chip, chan_address);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"Error reading in continuous mode:%d\n", ret);
+			goto unlock_out;
+		}
+		break;
+	default:
+		if (!rradc_is_ready(chip, chan_address)) {
+			/*
+			 * Usually this means the channel isn't attached, for example
+			 * the in_voltage_usbin_v_input channel will not be ready if
+			 * no USB cable is attached
+			 */
+			dev_dbg(chip->dev, "channel '%s' is not ready\n",
+				iio_chan->extend_name);
+			ret = -ENODATA;
+			goto unlock_out;
+		}
+		break;
+	}
+
+	ret = rradc_read(chip, chan->lsb, buf, chan->size);
+	if (ret) {
+		dev_err(chip->dev, "read data failed\n");
+		goto unlock_out;
+	}
+
+	/*
+	 * For the battery ID we read the register for every ID ADC and then
+	 * see which one is actually connected.
+	 */
+	if (chan_address == RR_ADC_BATT_ID) {
+		u16 batt_id_150 = le16_to_cpu(buf[2]);
+		u16 batt_id_15 = le16_to_cpu(buf[1]);
+		u16 batt_id_5 = le16_to_cpu(buf[0]);
+
+		if (!batt_id_150 && !batt_id_15 && !batt_id_5) {
+			dev_err(chip->dev,
+				"Invalid batt_id values with all zeros\n");
+			ret = -EINVAL;
+			goto unlock_out;
+		}
+
+		if (batt_id_150 <= RR_ADC_BATT_ID_RANGE) {
+			*data = batt_id_150;
+			chip->batt_id_data = 150;
+		} else if (batt_id_15 <= RR_ADC_BATT_ID_RANGE) {
+			*data = batt_id_15;
+			chip->batt_id_data = 15;
+		} else {
+			*data = batt_id_5;
+			chip->batt_id_data = 5;
+		}
+	} else {
+		/*
+		 * All of the other channels are either 1 or 2 bytes.
+		 * We can rely on the second byte being 0 for 1-byte channels.
+		 */
+		*data = le16_to_cpu(buf[0]);
+	}
+
+unlock_out:
+	mutex_unlock(&chip->conversion_lock);
+
+	return ret;
+}
+
+static int rradc_read_scale(struct rradc_chip *chip, int chan_address, int *val,
+			    int *val2)
+{
+	int64_t fab_offset, fab_slope;
+	int ret;
+
+	ret = rradc_get_fab_coeff(chip, &fab_offset, &fab_slope);
+	if (ret < 0) {
+		dev_err(chip->dev, "Unable to get fab id coefficients\n");
+		return -EINVAL;
+	}
+
+	switch (chan_address) {
+	case RR_ADC_SKIN_TEMP:
+		*val = MILLI;
+		*val2 = RR_ADC_BATT_THERM_LSB_K;
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_USBIN_I:
+		*val = RR_ADC_CURR_USBIN_INPUT_FACTOR_MIL *
+		       RR_ADC_FS_VOLTAGE_MV;
+		*val2 = RR_ADC_CHAN_MSB;
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_DCIN_I:
+		*val = RR_ADC_CURR_INPUT_FACTOR * RR_ADC_FS_VOLTAGE_MV;
+		*val2 = RR_ADC_CHAN_MSB;
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_USBIN_V:
+	case RR_ADC_DCIN_V:
+		*val = RR_ADC_VOLT_INPUT_FACTOR * RR_ADC_FS_VOLTAGE_MV * MILLI;
+		*val2 = RR_ADC_CHAN_MSB;
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_GPIO:
+		*val = RR_ADC_GPIO_FS_RANGE;
+		*val2 = RR_ADC_CHAN_MSB;
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_CHG_TEMP:
+		/*
+		 * We divide val2 by MILLI instead of multiplying val
+		 * to avoid an integer overflow.
+		 */
+		*val = -RR_ADC_TEMP_FS_VOLTAGE_NUM;
+		*val2 = div64_s64(RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+					  fab_slope,
+				  MILLI);
+
+		return IIO_VAL_FRACTIONAL;
+	case RR_ADC_DIE_TEMP:
+		*val = RR_ADC_TEMP_FS_VOLTAGE_NUM;
+		*val2 = RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+			RR_ADC_DIE_TEMP_SLOPE;
+
+		return IIO_VAL_FRACTIONAL;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int rradc_read_offset(struct rradc_chip *chip, int chan_address, int *val)
+{
+	int64_t fab_offset, fab_slope;
+	int64_t offset1, offset2;
+	int ret;
+
+	switch (chan_address) {
+	case RR_ADC_SKIN_TEMP:
+		/*
+		 * Offset from kelvin to degC, divided by the
+		 * scale factor (250). We lose some precision here.
+		 * 273150 / 250 = 1092.6
+		 */
+		*val = div64_s64(ABSOLUTE_ZERO_MILLICELSIUS,
+				 (MILLI / RR_ADC_BATT_THERM_LSB_K));
+		return IIO_VAL_INT;
+	case RR_ADC_CHG_TEMP:
+		ret = rradc_get_fab_coeff(chip, &fab_offset, &fab_slope);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"Unable to get fab id coefficients\n");
+			return -EINVAL;
+		}
+		offset1 = -(fab_offset * RR_ADC_TEMP_FS_VOLTAGE_DEN *
+			    RR_ADC_CHAN_MSB);
+		offset1 += (int64_t)RR_ADC_TEMP_FS_VOLTAGE_NUM / 2ULL;
+		offset1 = div64_s64(offset1,
+				    (int64_t)(RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+		offset2 = (int64_t)RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC *
+			  RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+			  (int64_t)fab_slope;
+		offset2 += ((int64_t)MILLI * RR_ADC_TEMP_FS_VOLTAGE_NUM) / 2;
+		offset2 = div64_s64(
+			offset2, ((int64_t)MILLI * RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+		/*
+		 * The -1 is to compensate for lost precision.
+		 * It should actually be -0.7906976744186046.
+		 * This works out to every value being off
+		 * by about +0.091 degrees C after applying offset and scale.
+		 */
+		*val = (int)(offset1 - offset2 - 1);
+		return IIO_VAL_INT;
+	case RR_ADC_DIE_TEMP:
+		offset1 = -RR_ADC_DIE_TEMP_OFFSET *
+			  (int64_t)RR_ADC_TEMP_FS_VOLTAGE_DEN *
+			  (int64_t)RR_ADC_CHAN_MSB;
+		offset1 = div64_s64(offset1, RR_ADC_TEMP_FS_VOLTAGE_NUM);
+
+		offset2 = -(int64_t)RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC *
+			  RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+			  RR_ADC_DIE_TEMP_SLOPE;
+		offset2 = div64_s64(offset2,
+				    ((int64_t)RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+		/*
+		 * The result is -339, it should be -338.69789, this results
+		 * in the calculated die temp being off by
+		 * -0.004 - -0.0175 degrees C
+		 */
+		*val = (int)(offset1 - offset2);
+		return IIO_VAL_INT;
+	default:
+		break;
+	}
+	return -EINVAL;
+}
+
+static int rradc_read_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan_spec, int *val,
+			  int *val2, long mask)
+{
+	struct rradc_chip *chip = iio_priv(indio_dev);
+	const struct rradc_channel *chan;
+	int ret;
+	u16 adc_code;
+
+	if (chan_spec->address >= RR_ADC_CHAN_MAX) {
+		dev_err(chip->dev, "Invalid channel index:%lu\n",
+			chan_spec->address);
+		return -EINVAL;
+	}
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		return rradc_read_scale(chip, chan_spec->address, val, val2);
+	case IIO_CHAN_INFO_OFFSET:
+		return rradc_read_offset(chip, chan_spec->address, val);
+	case IIO_CHAN_INFO_RAW:
+		ret = rradc_do_conversion(chip, chan_spec->address, &adc_code);
+		if (ret < 0)
+			return ret;
+
+		*val = adc_code;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_PROCESSED:
+		chan = &rradc_chans[chan_spec->address];
+		if (!chan->scale_fn)
+			return -EINVAL;
+		ret = rradc_do_conversion(chip, chan_spec->address, &adc_code);
+		if (ret < 0)
+			return ret;
+
+		*val = chan->scale_fn(chip, adc_code, val);
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int rradc_read_label(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, char *label)
+{
+	return snprintf(label, PAGE_SIZE, "%s\n",
+			rradc_chans[chan->address].label);
+}
+
+static const struct iio_info rradc_info = {
+	.read_raw = rradc_read_raw,
+	.read_label = rradc_read_label,
+};
+
+static const struct rradc_channel rradc_chans[RR_ADC_CHAN_MAX] = {
+	{
+		.label = "batt_id",
+		.scale_fn = rradc_post_process_batt_id,
+		.lsb = RR_ADC_BATT_ID_5_LSB,
+		.status = RR_ADC_BATT_ID_STS,
+		.size = 6,
+		.trigger_addr = RR_ADC_BATT_ID_TRIGGER,
+		.trigger_mask = BIT(0),
+	}, {
+		.label = "batt",
+		.lsb = RR_ADC_BATT_THERM_LSB,
+		.status = RR_ADC_BATT_THERM_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_BATT_THERM_TRIGGER,
+	}, {
+		.label = "pmi8998_skin",
+		.lsb = RR_ADC_SKIN_TEMP_LSB,
+		.status = RR_ADC_AUX_THERM_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_AUX_THERM_TRIGGER,
+	}, {
+		.label = "usbin_i",
+		.lsb = RR_ADC_USB_IN_I_LSB,
+		.status = RR_ADC_USB_IN_I_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_USB_IN_I_TRIGGER,
+	}, {
+		.label = "usbin_v",
+		.lsb = RR_ADC_USB_IN_V_LSB,
+		.status = RR_ADC_USB_IN_V_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_USB_IN_V_TRIGGER,
+		.trigger_mask = BIT(7),
+	}, {
+		.label = "dcin_i",
+		.lsb = RR_ADC_DC_IN_I_LSB,
+		.status = RR_ADC_DC_IN_I_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_DC_IN_I_TRIGGER,
+	}, {
+		.label = "dcin_v",
+		.lsb = RR_ADC_DC_IN_V_LSB,
+		.status = RR_ADC_DC_IN_V_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_DC_IN_V_TRIGGER,
+	}, {
+		.label = "pmi8998_die",
+		.lsb = RR_ADC_PMI_DIE_TEMP_LSB,
+		.status = RR_ADC_PMI_DIE_TEMP_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_PMI_DIE_TEMP_TRIGGER,
+		.trigger_mask = RR_ADC_TRIGGER_EVERY_CYCLE,
+	}, {
+		.label = "chg",
+		.lsb = RR_ADC_CHARGER_TEMP_LSB,
+		.status = RR_ADC_CHARGER_TEMP_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_CHARGER_TEMP_TRIGGER,
+	}, {
+		.label = "gpio",
+		.lsb = RR_ADC_GPIO_LSB,
+		.status = RR_ADC_GPIO_STS,
+		.size = 2,
+		.trigger_addr = RR_ADC_GPIO_TRIGGER,
+	},
+};
+
+static const struct iio_chan_spec rradc_iio_chans[RR_ADC_CHAN_MAX] = {
+	{
+		.type = IIO_RESISTANCE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.address = RR_ADC_BATT_ID,
+		.channel = 0,
+		.indexed = 1,
+	}, {
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.address = RR_ADC_BATT_THERM,
+		.channel = 0,
+		.indexed = 1,
+	}, {
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+		.address = RR_ADC_SKIN_TEMP,
+		.channel = 1,
+		.indexed = 1,
+	}, {
+		.type = IIO_CURRENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_USBIN_I,
+		.channel = 0,
+		.indexed = 1,
+	}, {
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_USBIN_V,
+		.channel = 0,
+		.indexed = 1,
+	}, {
+		.type = IIO_CURRENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_DCIN_I,
+		.channel = 1,
+		.indexed = 1,
+	}, {
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_DCIN_V,
+		.channel = 1,
+		.indexed = 1,
+	}, {
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+		.address = RR_ADC_DIE_TEMP,
+		.channel = 2,
+		.indexed = 1,
+	}, {
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_OFFSET) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_CHG_TEMP,
+		.channel = 3,
+		.indexed = 1,
+	}, {
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.address = RR_ADC_GPIO,
+		.channel = 2,
+		.indexed = 1,
+	},
+};
+
+static int rradc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iio_dev *indio_dev;
+	struct rradc_chip *chip;
+	int ret, i, batt_id_delay;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	chip = iio_priv(indio_dev);
+	chip->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!chip->regmap) {
+		dev_err(dev, "Couldn't get parent's regmap\n");
+		return -EINVAL;
+	}
+
+	chip->dev = dev;
+	mutex_init(&chip->conversion_lock);
+
+	ret = device_property_read_u32(dev, "reg", &chip->base);
+	if (ret < 0) {
+		dev_err(chip->dev, "Couldn't find reg address, ret = %d\n",
+			ret);
+		return ret;
+	}
+
+	batt_id_delay = -1;
+	ret = device_property_read_u32(dev, "qcom,batt-id-delay-ms",
+				       &batt_id_delay);
+	if (!ret) {
+		for (i = 0; i < RRADC_BATT_ID_DELAY_MAX; i++) {
+			if (batt_id_delay == batt_id_delays[i])
+				break;
+		}
+		if (i == RRADC_BATT_ID_DELAY_MAX)
+			batt_id_delay = -1;
+	}
+
+	if (batt_id_delay >= 0) {
+		batt_id_delay = FIELD_PREP(BATT_ID_SETTLE_MASK, batt_id_delay);
+		ret = regmap_update_bits(chip->regmap,
+					 chip->base + RR_ADC_BATT_ID_CFG,
+					 batt_id_delay, batt_id_delay);
+		if (ret < 0) {
+			dev_err(chip->dev,
+				"BATT_ID settling time config failed:%d\n",
+				ret);
+		}
+	}
+
+	/* Get the PMIC revision, we need it to handle some varying coefficients */
+	chip->pmic = qcom_pmic_get(chip->dev);
+	if (IS_ERR(chip->pmic)) {
+		dev_err(chip->dev, "Unable to get reference to PMIC device\n");
+		return PTR_ERR(chip->pmic);
+	}
+
+	switch (chip->pmic->subtype) {
+	case PMI8998_SUBTYPE:
+		indio_dev->name = "pmi8998-rradc";
+		break;
+	case PM660_SUBTYPE:
+		indio_dev->name = "pm660-rradc";
+		break;
+	default:
+		indio_dev->name = DRIVER_NAME;
+		break;
+	}
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &rradc_info;
+	indio_dev->channels = rradc_iio_chans;
+	indio_dev->num_channels = ARRAY_SIZE(rradc_iio_chans);
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct of_device_id rradc_match_table[] = {
+	{ .compatible = "qcom,pm660-rradc" },
+	{ .compatible = "qcom,pmi8998-rradc" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rradc_match_table);
+
+static struct platform_driver rradc_driver = {
+	.driver		= {
+		.name		= DRIVER_NAME,
+		.of_match_table	= rradc_match_table,
+	},
+	.probe = rradc_probe,
+};
+module_platform_driver(rradc_driver);
+
+MODULE_DESCRIPTION("QCOM SPMI PMIC RR ADC driver");
+MODULE_AUTHOR("Caleb Connolly <caleb.connolly@linaro.org>");
+MODULE_LICENSE("GPL");