Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block

[linux/fpc-iii.git] / 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;
};

/* In these definitions, _pre refers to an index into adc5_prescale_ratios. */
#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", 0,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_1P25VREF]         = ADC5_CHAN_VOLT("vref_1p25", 0,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_VPH_PWR]          = ADC5_CHAN_VOLT("vph_pwr", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_VBAT_SNS]         = ADC5_CHAN_VOLT("vbat_sns", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_DIE_TEMP]         = ADC5_CHAN_TEMP("die_temp", 0,
                                        SCALE_HW_CALIB_PMIC_THERM)
        [ADC5_USB_IN_I]         = ADC5_CHAN_VOLT("usb_in_i_uv", 0,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_USB_IN_V_16]      = ADC5_CHAN_VOLT("usb_in_v_div_16", 8,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_CHG_TEMP]         = ADC5_CHAN_TEMP("chg_temp", 0,
                                        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", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_MID_CHG_DIV6]     = ADC5_CHAN_VOLT("chg_mid_chg", 3,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_XO_THERM_100K_PU] = ADC5_CHAN_TEMP("xo_therm", 0,
                                        SCALE_HW_CALIB_XOTHERM)
        [ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM2]        = ADC5_CHAN_TEMP("amux_thm2", 0,
                                        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", 0,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_1P25VREF]         = ADC5_CHAN_VOLT("vref_1p25", 0,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_VPH_PWR]          = ADC5_CHAN_VOLT("vph_pwr", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_VBAT_SNS]         = ADC5_CHAN_VOLT("vbat_sns", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_VCOIN]            = ADC5_CHAN_VOLT("vcoin", 1,
                                        SCALE_HW_CALIB_DEFAULT)
        [ADC5_DIE_TEMP]         = ADC5_CHAN_TEMP("die_temp", 0,
                                        SCALE_HW_CALIB_PMIC_THERM)
        [ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM4_100K_PU] = ADC5_CHAN_TEMP("amux_thm4_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_AMUX_THM5_100K_PU] = ADC5_CHAN_TEMP("amux_thm5_100k_pu", 0,
                                        SCALE_HW_CALIB_THERM_100K_PULLUP)
        [ADC5_XO_THERM_100K_PU] = ADC5_CHAN_TEMP("xo_therm_100k_pu", 0,
                                        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 ||
            !data->adc_chans[chan].datasheet_name) {
                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;
        } else {
                prop->prescale =
                        adc->data->adc_chans[prop->channel].prescale_index;
        }

        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,
        },
        { }
};
MODULE_DEVICE_TABLE(of, adc5_match_table);

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");