diff options
Diffstat (limited to 'drivers/iio/adc/ad7476.c')
| -rw-r--r-- | drivers/iio/adc/ad7476.c | 120 |
1 files changed, 103 insertions, 17 deletions
diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c index 9e9ff07cf972..a1e8b32671cf 100644 --- a/drivers/iio/adc/ad7476.c +++ b/drivers/iio/adc/ad7476.c @@ -32,12 +32,14 @@ struct ad7476_chip_info { /* channels used when convst gpio is defined */ struct iio_chan_spec convst_channel[2]; void (*reset)(struct ad7476_state *); + bool has_vref; + bool has_vdrive; }; struct ad7476_state { struct spi_device *spi; const struct ad7476_chip_info *chip_info; - struct regulator *reg; + struct regulator *ref_reg; struct gpio_desc *convst_gpio; struct spi_transfer xfer; struct spi_message msg; @@ -52,13 +54,17 @@ struct ad7476_state { }; enum ad7476_supported_device_ids { + ID_AD7091, ID_AD7091R, + ID_AD7273, + ID_AD7274, ID_AD7276, ID_AD7277, ID_AD7278, ID_AD7466, ID_AD7467, ID_AD7468, + ID_AD7475, ID_AD7495, ID_AD7940, ID_ADC081S, @@ -145,8 +151,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev, GENMASK(st->chip_info->channel[0].scan_type.realbits - 1, 0); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: - if (!st->chip_info->int_vref_uv) { - scale_uv = regulator_get_voltage(st->reg); + if (st->ref_reg) { + scale_uv = regulator_get_voltage(st->ref_reg); if (scale_uv < 0) return scale_uv; } else { @@ -187,13 +193,32 @@ static int ad7476_read_raw(struct iio_dev *indio_dev, BIT(IIO_CHAN_INFO_RAW)) static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { + [ID_AD7091] = { + .channel[0] = AD7091R_CHAN(12), + .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .convst_channel[0] = AD7091R_CONVST_CHAN(12), + .convst_channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .reset = ad7091_reset, + }, [ID_AD7091R] = { .channel[0] = AD7091R_CHAN(12), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), .convst_channel[0] = AD7091R_CONVST_CHAN(12), .convst_channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .int_vref_uv = 2500000, + .has_vref = true, .reset = ad7091_reset, }, + [ID_AD7273] = { + .channel[0] = AD7940_CHAN(10), + .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref = true, + }, + [ID_AD7274] = { + .channel[0] = AD7940_CHAN(12), + .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref = true, + }, [ID_AD7276] = { .channel[0] = AD7940_CHAN(12), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), @@ -218,10 +243,17 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { .channel[0] = AD7476_CHAN(8), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, + [ID_AD7475] = { + .channel[0] = AD7476_CHAN(12), + .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref = true, + .has_vdrive = true, + }, [ID_AD7495] = { .channel[0] = AD7476_CHAN(12), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), .int_vref_uv = 2500000, + .has_vdrive = true, }, [ID_AD7940] = { .channel[0] = AD7940_CHAN(14), @@ -254,6 +286,7 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { [ID_LTC2314_14] = { .channel[0] = AD7940_CHAN(14), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref = true, }, }; @@ -263,15 +296,16 @@ static const struct iio_info ad7476_info = { static void ad7476_reg_disable(void *data) { - struct ad7476_state *st = data; + struct regulator *reg = data; - regulator_disable(st->reg); + regulator_disable(reg); } static int ad7476_probe(struct spi_device *spi) { struct ad7476_state *st; struct iio_dev *indio_dev; + struct regulator *reg; int ret; indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); @@ -282,27 +316,79 @@ static int ad7476_probe(struct spi_device *spi) st->chip_info = &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data]; - st->reg = devm_regulator_get(&spi->dev, "vcc"); - if (IS_ERR(st->reg)) - return PTR_ERR(st->reg); + reg = devm_regulator_get(&spi->dev, "vcc"); + if (IS_ERR(reg)) + return PTR_ERR(reg); - ret = regulator_enable(st->reg); + ret = regulator_enable(reg); if (ret) return ret; - ret = devm_add_action_or_reset(&spi->dev, ad7476_reg_disable, - st); + ret = devm_add_action_or_reset(&spi->dev, ad7476_reg_disable, reg); if (ret) return ret; + /* Either vcc or vref (below) as appropriate */ + if (!st->chip_info->int_vref_uv) + st->ref_reg = reg; + + if (st->chip_info->has_vref) { + + /* If a device has an internal reference vref is optional */ + if (st->chip_info->int_vref_uv) { + reg = devm_regulator_get_optional(&spi->dev, "vref"); + if (IS_ERR(reg) && (PTR_ERR(reg) != -ENODEV)) + return PTR_ERR(reg); + } else { + reg = devm_regulator_get(&spi->dev, "vref"); + if (IS_ERR(reg)) + return PTR_ERR(reg); + } + + if (!IS_ERR(reg)) { + ret = regulator_enable(reg); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&spi->dev, + ad7476_reg_disable, + reg); + if (ret) + return ret; + st->ref_reg = reg; + } else { + /* + * Can only get here if device supports both internal + * and external reference, but the regulator connected + * to the external reference is not connected. + * Set the reference regulator pointer to NULL to + * indicate this. + */ + st->ref_reg = NULL; + } + } + + if (st->chip_info->has_vdrive) { + reg = devm_regulator_get(&spi->dev, "vdrive"); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + ret = regulator_enable(reg); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&spi->dev, ad7476_reg_disable, + reg); + if (ret) + return ret; + } + st->convst_gpio = devm_gpiod_get_optional(&spi->dev, "adi,conversion-start", GPIOD_OUT_LOW); if (IS_ERR(st->convst_gpio)) return PTR_ERR(st->convst_gpio); - spi_set_drvdata(spi, indio_dev); - st->spi = spi; indio_dev->name = spi_get_device_id(spi)->name; @@ -333,17 +419,17 @@ static int ad7476_probe(struct spi_device *spi) } static const struct spi_device_id ad7476_id[] = { - {"ad7091", ID_AD7091R}, + {"ad7091", ID_AD7091}, {"ad7091r", ID_AD7091R}, - {"ad7273", ID_AD7277}, - {"ad7274", ID_AD7276}, + {"ad7273", ID_AD7273}, + {"ad7274", ID_AD7274}, {"ad7276", ID_AD7276}, {"ad7277", ID_AD7277}, {"ad7278", ID_AD7278}, {"ad7466", ID_AD7466}, {"ad7467", ID_AD7467}, {"ad7468", ID_AD7468}, - {"ad7475", ID_AD7466}, + {"ad7475", ID_AD7475}, {"ad7476", ID_AD7466}, {"ad7476a", ID_AD7466}, {"ad7477", ID_AD7467}, |