diff options
Diffstat (limited to 'drivers/iio/dac/ad5761.c')
| -rw-r--r-- | drivers/iio/dac/ad5761.c | 119 |
1 files changed, 26 insertions, 93 deletions
diff --git a/drivers/iio/dac/ad5761.c b/drivers/iio/dac/ad5761.c index e37e095e94fc..b5d20f04f070 100644 --- a/drivers/iio/dac/ad5761.c +++ b/drivers/iio/dac/ad5761.c @@ -53,7 +53,6 @@ enum ad5761_supported_device_ids { /** * struct ad5761_state - driver instance specific data * @spi: spi_device - * @vref_reg: reference voltage regulator * @use_intref: true when the internal voltage reference is used * @vref: actual voltage reference in mVolts * @range: output range mode used @@ -62,7 +61,6 @@ enum ad5761_supported_device_ids { */ struct ad5761_state { struct spi_device *spi; - struct regulator *vref_reg; struct mutex lock; bool use_intref; @@ -70,13 +68,13 @@ struct ad5761_state { enum ad5761_voltage_range range; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ union { __be32 d32; u8 d8[4]; - } data[3] ____cacheline_aligned; + } data[3] __aligned(IIO_DMA_MINALIGN); }; static const struct ad5761_range_params ad5761_range_params[] = { @@ -139,13 +137,11 @@ static int _ad5761_spi_read(struct ad5761_state *st, u8 addr, u16 *val) struct spi_transfer xfers[] = { { .tx_buf = &st->data[0].d8[1], - .bits_per_word = 8, .len = 3, .cs_change = true, }, { .tx_buf = &st->data[1].d8[1], .rx_buf = &st->data[2].d8[1], - .bits_per_word = 8, .len = 3, }, }; @@ -287,63 +283,6 @@ static const struct ad5761_chip_info ad5761_chip_infos[] = { }, }; -static int ad5761_get_vref(struct ad5761_state *st, - const struct ad5761_chip_info *chip_info) -{ - int ret; - - st->vref_reg = devm_regulator_get_optional(&st->spi->dev, "vref"); - if (PTR_ERR(st->vref_reg) == -ENODEV) { - /* Use Internal regulator */ - if (!chip_info->int_vref) { - dev_err(&st->spi->dev, - "Voltage reference not found\n"); - return -EIO; - } - - st->use_intref = true; - st->vref = chip_info->int_vref; - return 0; - } - - if (IS_ERR(st->vref_reg)) { - dev_err(&st->spi->dev, - "Error getting voltage reference regulator\n"); - return PTR_ERR(st->vref_reg); - } - - ret = regulator_enable(st->vref_reg); - if (ret) { - dev_err(&st->spi->dev, - "Failed to enable voltage reference\n"); - return ret; - } - - ret = regulator_get_voltage(st->vref_reg); - if (ret < 0) { - dev_err(&st->spi->dev, - "Failed to get voltage reference value\n"); - goto disable_regulator_vref; - } - - if (ret < 2000000 || ret > 3000000) { - dev_warn(&st->spi->dev, - "Invalid external voltage ref. value %d uV\n", ret); - ret = -EIO; - goto disable_regulator_vref; - } - - st->vref = ret / 1000; - st->use_intref = false; - - return 0; - -disable_regulator_vref: - regulator_disable(st->vref_reg); - st->vref_reg = NULL; - return ret; -} - static int ad5761_probe(struct spi_device *spi) { struct iio_dev *iio_dev; @@ -361,11 +300,28 @@ static int ad5761_probe(struct spi_device *spi) st = iio_priv(iio_dev); st->spi = spi; - spi_set_drvdata(spi, iio_dev); - ret = ad5761_get_vref(st, chip_info); - if (ret) - return ret; + ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref"); + if (ret < 0 && ret != -ENODEV) + return dev_err_probe(&spi->dev, ret, + "Failed to get voltage reference value\n"); + if (ret == -ENODEV) { + /* Use Internal regulator */ + if (!chip_info->int_vref) + return dev_err_probe(&spi->dev, -EIO, + "Voltage reference not found\n"); + + st->use_intref = true; + st->vref = chip_info->int_vref; + } else { + if (ret < 2000000 || ret > 3000000) + return dev_err_probe(&spi->dev, -EIO, + "Invalid external voltage ref. value %d uV\n", + ret); + + st->use_intref = false; + st->vref = ret / 1000; + } if (pdata) voltage_range = pdata->voltage_range; @@ -374,37 +330,15 @@ static int ad5761_probe(struct spi_device *spi) ret = ad5761_spi_set_range(st, voltage_range); if (ret) - goto disable_regulator_err; + return ret; iio_dev->info = &ad5761_info; iio_dev->modes = INDIO_DIRECT_MODE; iio_dev->channels = &chip_info->channel; iio_dev->num_channels = 1; iio_dev->name = spi_get_device_id(st->spi)->name; - ret = iio_device_register(iio_dev); - if (ret) - goto disable_regulator_err; - return 0; - -disable_regulator_err: - if (!IS_ERR_OR_NULL(st->vref_reg)) - regulator_disable(st->vref_reg); - - return ret; -} - -static int ad5761_remove(struct spi_device *spi) -{ - struct iio_dev *iio_dev = spi_get_drvdata(spi); - struct ad5761_state *st = iio_priv(iio_dev); - - iio_device_unregister(iio_dev); - - if (!IS_ERR_OR_NULL(st->vref_reg)) - regulator_disable(st->vref_reg); - - return 0; + return devm_iio_device_register(&spi->dev, iio_dev); } static const struct spi_device_id ad5761_id[] = { @@ -412,7 +346,7 @@ static const struct spi_device_id ad5761_id[] = { {"ad5721r", ID_AD5721R}, {"ad5761", ID_AD5761}, {"ad5761r", ID_AD5761R}, - {} + { } }; MODULE_DEVICE_TABLE(spi, ad5761_id); @@ -421,7 +355,6 @@ static struct spi_driver ad5761_driver = { .name = "ad5761", }, .probe = ad5761_probe, - .remove = ad5761_remove, .id_table = ad5761_id, }; module_spi_driver(ad5761_driver); |