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    Subject[PATCH v4 10/15] iio: adc: axp20x_adc: Add support for AXP192
    Date
    The AXP192 is identical to the AXP20x, except for the addition of
    two more GPIO ADC channels.

    Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
    ---
    drivers/iio/adc/axp20x_adc.c | 279 +++++++++++++++++++++++++++++++++++
    1 file changed, 279 insertions(+)

    diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c
    index 75bda94dbce1..8d748b814f20 100644
    --- a/drivers/iio/adc/axp20x_adc.c
    +++ b/drivers/iio/adc/axp20x_adc.c
    @@ -22,11 +22,19 @@
    #include <linux/iio/machine.h>
    #include <linux/mfd/axp20x.h>

    +#define AXP192_ADC_EN1_MASK GENMASK(7, 0)
    +#define AXP192_ADC_EN2_MASK (GENMASK(3, 0) | BIT(7))
    +
    #define AXP20X_ADC_EN1_MASK GENMASK(7, 0)
    #define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7))

    #define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0))

    +#define AXP192_GPIO30_IN_RANGE_GPIO0 BIT(0)
    +#define AXP192_GPIO30_IN_RANGE_GPIO1 BIT(1)
    +#define AXP192_GPIO30_IN_RANGE_GPIO2 BIT(2)
    +#define AXP192_GPIO30_IN_RANGE_GPIO3 BIT(3)
    +
    #define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0)
    #define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1)

    @@ -71,6 +79,25 @@ struct axp20x_adc_iio {
    const struct axp_data *data;
    };

    +enum axp192_adc_channel_v {
    + AXP192_ACIN_V = 0,
    + AXP192_VBUS_V,
    + AXP192_TS_IN,
    + AXP192_GPIO0_V,
    + AXP192_GPIO1_V,
    + AXP192_GPIO2_V,
    + AXP192_GPIO3_V,
    + AXP192_IPSOUT_V,
    + AXP192_BATT_V,
    +};
    +
    +enum axp192_adc_channel_i {
    + AXP192_ACIN_I = 0,
    + AXP192_VBUS_I,
    + AXP192_BATT_CHRG_I,
    + AXP192_BATT_DISCHRG_I,
    +};
    +
    enum axp20x_adc_channel_v {
    AXP20X_ACIN_V = 0,
    AXP20X_VBUS_V,
    @@ -158,6 +185,43 @@ static struct iio_map axp22x_maps[] = {
    * The only exception is for the battery. batt_v will be in_voltage6_raw and
    * charge current in_current6_raw and discharge current will be in_current7_raw.
    */
    +static const struct iio_chan_spec axp192_adc_channels[] = {
    + AXP20X_ADC_CHANNEL(AXP192_ACIN_V, "acin_v", IIO_VOLTAGE,
    + AXP20X_ACIN_V_ADC_H),
    + AXP20X_ADC_CHANNEL(AXP192_ACIN_I, "acin_i", IIO_CURRENT,
    + AXP20X_ACIN_I_ADC_H),
    + AXP20X_ADC_CHANNEL(AXP192_VBUS_V, "vbus_v", IIO_VOLTAGE,
    + AXP20X_VBUS_V_ADC_H),
    + AXP20X_ADC_CHANNEL(AXP192_VBUS_I, "vbus_i", IIO_CURRENT,
    + AXP20X_VBUS_I_ADC_H),
    + {
    + .type = IIO_TEMP,
    + .address = AXP20X_TEMP_ADC_H,
    + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
    + BIT(IIO_CHAN_INFO_SCALE) |
    + BIT(IIO_CHAN_INFO_OFFSET),
    + .datasheet_name = "pmic_temp",
    + },
    + AXP20X_ADC_CHANNEL_OFFSET(AXP192_GPIO0_V, "gpio0_v", IIO_VOLTAGE,
    + AXP20X_GPIO0_V_ADC_H),
    + AXP20X_ADC_CHANNEL_OFFSET(AXP192_GPIO1_V, "gpio1_v", IIO_VOLTAGE,
    + AXP20X_GPIO1_V_ADC_H),
    + AXP20X_ADC_CHANNEL_OFFSET(AXP192_GPIO2_V, "gpio2_v", IIO_VOLTAGE,
    + AXP192_GPIO2_V_ADC_H),
    + AXP20X_ADC_CHANNEL_OFFSET(AXP192_GPIO3_V, "gpio3_v", IIO_VOLTAGE,
    + AXP192_GPIO3_V_ADC_H),
    + AXP20X_ADC_CHANNEL(AXP192_IPSOUT_V, "ipsout_v", IIO_VOLTAGE,
    + AXP20X_IPSOUT_V_HIGH_H),
    + AXP20X_ADC_CHANNEL(AXP192_BATT_V, "batt_v", IIO_VOLTAGE,
    + AXP20X_BATT_V_H),
    + AXP20X_ADC_CHANNEL(AXP192_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
    + AXP20X_BATT_CHRG_I_H),
    + AXP20X_ADC_CHANNEL(AXP192_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
    + AXP20X_BATT_DISCHRG_I_H),
    + AXP20X_ADC_CHANNEL(AXP192_TS_IN, "ts_v", IIO_VOLTAGE,
    + AXP20X_TS_IN_H),
    +};
    +
    static const struct iio_chan_spec axp20x_adc_channels[] = {
    AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE,
    AXP20X_ACIN_V_ADC_H),
    @@ -231,6 +295,27 @@ static const struct iio_chan_spec axp813_adc_channels[] = {
    AXP288_TS_ADC_H),
    };

    +static int axp192_adc_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *chan, int *val)
    +{
    + struct axp20x_adc_iio *info = iio_priv(indio_dev);
    + int ret, size;
    +
    + if (chan->type == IIO_CURRENT &&
    + (chan->channel == AXP192_BATT_CHRG_I ||
    + chan->channel == AXP192_BATT_DISCHRG_I))
    + size = 13;
    + else
    + size = 12;
    +
    + ret = axp20x_read_variable_width(info->regmap, chan->address, size);
    + if (ret < 0)
    + return ret;
    +
    + *val = ret;
    + return IIO_VAL_INT;
    +}
    +
    static int axp20x_adc_raw(struct iio_dev *indio_dev,
    struct iio_chan_spec const *chan, int *val)
    {
    @@ -283,6 +368,44 @@ static int axp813_adc_raw(struct iio_dev *indio_dev,
    return IIO_VAL_INT;
    }

    +static int axp192_adc_scale_voltage(int channel, int *val, int *val2)
    +{
    + switch (channel) {
    + case AXP192_ACIN_V:
    + case AXP192_VBUS_V:
    + *val = 1;
    + *val2 = 700000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + case AXP192_GPIO0_V:
    + case AXP192_GPIO1_V:
    + case AXP192_GPIO2_V:
    + case AXP192_GPIO3_V:
    + *val = 0;
    + *val2 = 500000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + case AXP192_BATT_V:
    + *val = 1;
    + *val2 = 100000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + case AXP192_IPSOUT_V:
    + *val = 1;
    + *val2 = 400000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + case AXP192_TS_IN:
    + /* 0.8 mV per LSB */
    + *val = 0;
    + *val2 = 800000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    static int axp20x_adc_scale_voltage(int channel, int *val, int *val2)
    {
    switch (channel) {
    @@ -386,6 +509,29 @@ static int axp20x_adc_scale_current(int channel, int *val, int *val2)
    }
    }

    +static int axp192_adc_scale(struct iio_chan_spec const *chan, int *val,
    + int *val2)
    +{
    + switch (chan->type) {
    + case IIO_VOLTAGE:
    + return axp192_adc_scale_voltage(chan->channel, val, val2);
    +
    + case IIO_CURRENT:
    + /*
    + * AXP192 current channels are identical to the AXP20x,
    + * therefore we can re-use the scaling function.
    + */
    + return axp20x_adc_scale_current(chan->channel, val, val2);
    +
    + case IIO_TEMP:
    + *val = 100;
    + return IIO_VAL_INT;
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val,
    int *val2)
    {
    @@ -445,6 +591,42 @@ static int axp813_adc_scale(struct iio_chan_spec const *chan, int *val,
    }
    }

    +static int axp192_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
    + int *val)
    +{
    + struct axp20x_adc_iio *info = iio_priv(indio_dev);
    + unsigned int regval;
    + int ret;
    +
    + ret = regmap_read(info->regmap, AXP192_GPIO30_IN_RANGE, &regval);
    + if (ret < 0)
    + return ret;
    +
    + switch (channel) {
    + case AXP192_GPIO0_V:
    + regval = FIELD_GET(AXP192_GPIO30_IN_RANGE_GPIO0, regval);
    + break;
    +
    + case AXP192_GPIO1_V:
    + regval = FIELD_GET(AXP192_GPIO30_IN_RANGE_GPIO1, regval);
    + break;
    +
    + case AXP192_GPIO2_V:
    + regval = FIELD_GET(AXP192_GPIO30_IN_RANGE_GPIO2, regval);
    + break;
    +
    + case AXP192_GPIO3_V:
    + regval = FIELD_GET(AXP192_GPIO30_IN_RANGE_GPIO3, regval);
    + break;
    +
    + default:
    + return -EINVAL;
    + }
    +
    + *val = regval ? 700000 : 0;
    + return IIO_VAL_INT;
    +}
    +
    static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
    int *val)
    {
    @@ -473,6 +655,22 @@ static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
    return IIO_VAL_INT;
    }

    +static int axp192_adc_offset(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *chan, int *val)
    +{
    + switch (chan->type) {
    + case IIO_VOLTAGE:
    + return axp192_adc_offset_voltage(indio_dev, chan->channel, val);
    +
    + case IIO_TEMP:
    + *val = -1447;
    + return IIO_VAL_INT;
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    static int axp20x_adc_offset(struct iio_dev *indio_dev,
    struct iio_chan_spec const *chan, int *val)
    {
    @@ -489,6 +687,25 @@ static int axp20x_adc_offset(struct iio_dev *indio_dev,
    }
    }

    +static int axp192_read_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *chan, int *val,
    + int *val2, long mask)
    +{
    + switch (mask) {
    + case IIO_CHAN_INFO_OFFSET:
    + return axp192_adc_offset(indio_dev, chan, val);
    +
    + case IIO_CHAN_INFO_SCALE:
    + return axp192_adc_scale(chan, val, val2);
    +
    + case IIO_CHAN_INFO_RAW:
    + return axp192_adc_raw(indio_dev, chan, val);
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    static int axp20x_read_raw(struct iio_dev *indio_dev,
    struct iio_chan_spec const *chan, int *val,
    int *val2, long mask)
    @@ -549,6 +766,51 @@ static int axp813_read_raw(struct iio_dev *indio_dev,
    }
    }

    +static int axp192_write_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *chan, int val, int val2,
    + long mask)
    +{
    + struct axp20x_adc_iio *info = iio_priv(indio_dev);
    + unsigned int regmask, regval;
    +
    + /*
    + * The AXP192 PMIC allows the user to choose between 0V and 0.7V offsets
    + * for (independently) GPIO0-3 when in ADC mode.
    + */
    + if (mask != IIO_CHAN_INFO_OFFSET)
    + return -EINVAL;
    +
    + if (val != 0 && val != 700000)
    + return -EINVAL;
    +
    + switch (chan->channel) {
    + case AXP192_GPIO0_V:
    + regmask = AXP192_GPIO30_IN_RANGE_GPIO0;
    + regval = FIELD_PREP(AXP192_GPIO30_IN_RANGE_GPIO0, !!val);
    + break;
    +
    + case AXP192_GPIO1_V:
    + regmask = AXP192_GPIO30_IN_RANGE_GPIO1;
    + regval = FIELD_PREP(AXP192_GPIO30_IN_RANGE_GPIO1, !!val);
    + break;
    +
    + case AXP192_GPIO2_V:
    + regmask = AXP192_GPIO30_IN_RANGE_GPIO2;
    + regval = FIELD_PREP(AXP192_GPIO30_IN_RANGE_GPIO2, !!val);
    + break;
    +
    + case AXP192_GPIO3_V:
    + regmask = AXP192_GPIO30_IN_RANGE_GPIO3;
    + regval = FIELD_PREP(AXP192_GPIO30_IN_RANGE_GPIO3, !!val);
    + break;
    +
    + default:
    + return -EINVAL;
    + }
    +
    + return regmap_update_bits(info->regmap, AXP192_GPIO30_IN_RANGE, regmask, regval);
    +}
    +
    static int axp20x_write_raw(struct iio_dev *indio_dev,
    struct iio_chan_spec const *chan, int val, int val2,
    long mask)
    @@ -584,6 +846,11 @@ static int axp20x_write_raw(struct iio_dev *indio_dev,
    return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, regmask, regval);
    }

    +static const struct iio_info axp192_adc_iio_info = {
    + .read_raw = axp192_read_raw,
    + .write_raw = axp192_write_raw,
    +};
    +
    static const struct iio_info axp20x_adc_iio_info = {
    .read_raw = axp20x_read_raw,
    .write_raw = axp20x_write_raw,
    @@ -629,6 +896,16 @@ struct axp_data {
    struct iio_map *maps;
    };

    +static const struct axp_data axp192_data = {
    + .iio_info = &axp192_adc_iio_info,
    + .num_channels = ARRAY_SIZE(axp192_adc_channels),
    + .channels = axp192_adc_channels,
    + .adc_en1_mask = AXP192_ADC_EN1_MASK,
    + .adc_en2_mask = AXP192_ADC_EN2_MASK,
    + .adc_rate = axp20x_adc_rate,
    + .maps = axp20x_maps,
    +};
    +
    static const struct axp_data axp20x_data = {
    .iio_info = &axp20x_adc_iio_info,
    .num_channels = ARRAY_SIZE(axp20x_adc_channels),
    @@ -658,6 +935,7 @@ static const struct axp_data axp813_data = {
    };

    static const struct of_device_id axp20x_adc_of_match[] = {
    + { .compatible = "x-powers,axp192-adc", .data = (void *)&axp192_data, },
    { .compatible = "x-powers,axp209-adc", .data = (void *)&axp20x_data, },
    { .compatible = "x-powers,axp221-adc", .data = (void *)&axp22x_data, },
    { .compatible = "x-powers,axp813-adc", .data = (void *)&axp813_data, },
    @@ -666,6 +944,7 @@ static const struct of_device_id axp20x_adc_of_match[] = {
    MODULE_DEVICE_TABLE(of, axp20x_adc_of_match);

    static const struct platform_device_id axp20x_adc_id_match[] = {
    + { .name = "axp192-adc", .driver_data = (kernel_ulong_t)&axp192_data, },
    { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, },
    { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, },
    { .name = "axp813-adc", .driver_data = (kernel_ulong_t)&axp813_data, },
    --
    2.35.1
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