diff options
Diffstat (limited to 'drivers/iio/adc/ad7476.c')
| -rw-r--r-- | drivers/iio/adc/ad7476.c | 59 |
1 files changed, 46 insertions, 13 deletions
diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c index 76747488044b..e9984a38fc4c 100644 --- a/drivers/iio/adc/ad7476.c +++ b/drivers/iio/adc/ad7476.c @@ -12,9 +12,11 @@ #include <linux/sysfs.h> #include <linux/spi/spi.h> #include <linux/regulator/consumer.h> +#include <linux/gpio/consumer.h> #include <linux/err.h> #include <linux/module.h> #include <linux/bitops.h> +#include <linux/delay.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -27,6 +29,8 @@ struct ad7476_state; struct ad7476_chip_info { unsigned int int_vref_uv; struct iio_chan_spec channel[2]; + /* channels used when convst gpio is defined */ + struct iio_chan_spec convst_channel[2]; void (*reset)(struct ad7476_state *); }; @@ -34,6 +38,7 @@ struct ad7476_state { struct spi_device *spi; const struct ad7476_chip_info *chip_info; struct regulator *reg; + struct gpio_desc *convst_gpio; struct spi_transfer xfer; struct spi_message msg; /* @@ -64,6 +69,17 @@ enum ad7476_supported_device_ids { ID_ADS7868, }; +static void ad7091_convst(struct ad7476_state *st) +{ + if (!st->convst_gpio) + return; + + gpiod_set_value(st->convst_gpio, 0); + udelay(1); /* CONVST pulse width: 10 ns min */ + gpiod_set_value(st->convst_gpio, 1); + udelay(1); /* Conversion time: 650 ns max */ +} + static irqreturn_t ad7476_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; @@ -71,6 +87,8 @@ static irqreturn_t ad7476_trigger_handler(int irq, void *p) struct ad7476_state *st = iio_priv(indio_dev); int b_sent; + ad7091_convst(st); + b_sent = spi_sync(st->spi, &st->msg); if (b_sent < 0) goto done; @@ -93,6 +111,8 @@ static int ad7476_scan_direct(struct ad7476_state *st) { int ret; + ad7091_convst(st); + ret = spi_sync(st->spi, &st->msg); if (ret) return ret; @@ -160,6 +180,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev, #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \ BIT(IIO_CHAN_INFO_RAW)) #define AD7091R_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), 0) +#define AD7091R_CONVST_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), \ + BIT(IIO_CHAN_INFO_RAW)) #define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \ BIT(IIO_CHAN_INFO_RAW)) @@ -167,6 +189,8 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { [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), .reset = ad7091_reset, }, [ID_AD7276] = { @@ -232,6 +256,13 @@ static const struct iio_info ad7476_info = { .read_raw = &ad7476_read_raw, }; +static void ad7476_reg_disable(void *data) +{ + struct ad7476_state *st = data; + + regulator_disable(st->reg); +} + static int ad7476_probe(struct spi_device *spi) { struct ad7476_state *st; @@ -254,6 +285,17 @@ static int ad7476_probe(struct spi_device *spi) if (ret) return ret; + ret = devm_add_action_or_reset(&spi->dev, ad7476_reg_disable, + st); + 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; @@ -266,6 +308,9 @@ static int ad7476_probe(struct spi_device *spi) indio_dev->channels = st->chip_info->channel; indio_dev->num_channels = 2; indio_dev->info = &ad7476_info; + + if (st->convst_gpio && st->chip_info->convst_channel) + indio_dev->channels = st->chip_info->convst_channel; /* Setup default message */ st->xfer.rx_buf = &st->data; @@ -295,19 +340,8 @@ error_disable_reg: return ret; } -static int ad7476_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad7476_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - iio_triggered_buffer_cleanup(indio_dev); - regulator_disable(st->reg); - - return 0; -} - static const struct spi_device_id ad7476_id[] = { + {"ad7091", ID_AD7091R}, {"ad7091r", ID_AD7091R}, {"ad7273", ID_AD7277}, {"ad7274", ID_AD7276}, @@ -343,7 +377,6 @@ static struct spi_driver ad7476_driver = { .name = "ad7476", }, .probe = ad7476_probe, - .remove = ad7476_remove, .id_table = ad7476_id, }; module_spi_driver(ad7476_driver); |