diff options
Diffstat (limited to 'drivers/iio/dac/ad5766.c')
| -rw-r--r-- | drivers/iio/dac/ad5766.c | 73 |
1 files changed, 52 insertions, 21 deletions
diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c index 3104ec32dfac..f6a0a0d84fef 100644 --- a/drivers/iio/dac/ad5766.c +++ b/drivers/iio/dac/ad5766.c @@ -5,13 +5,16 @@ * Copyright 2019-2020 Analog Devices Inc. */ #include <linux/bitfield.h> +#include <linux/bitops.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/gpio/consumer.h> #include <linux/iio/iio.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/trigger_consumer.h> #include <linux/module.h> #include <linux/spi/spi.h> -#include <asm/unaligned.h> +#include <linux/unaligned.h> #define AD5766_UPPER_WORD_SPI_MASK GENMASK(31, 16) #define AD5766_LOWER_WORD_SPI_MASK GENMASK(15, 0) @@ -120,7 +123,7 @@ struct ad5766_state { u32 d32; u16 w16[2]; u8 b8[4]; - } data[3] ____cacheline_aligned; + } data[3] __aligned(IIO_DMA_MINALIGN); }; struct ad5766_span_tbl { @@ -145,13 +148,11 @@ static int __ad5766_spi_read(struct ad5766_state *st, u8 dac, int *val) struct spi_transfer xfers[] = { { .tx_buf = &st->data[0].d32, - .bits_per_word = 8, .len = 3, .cs_change = 1, }, { .tx_buf = &st->data[1].d32, .rx_buf = &st->data[2].d32, - .bits_per_word = 8, .len = 3, }, }; @@ -423,14 +424,6 @@ static ssize_t ad5766_write_ext(struct iio_dev *indio_dev, .shared = _shared, \ } -#define IIO_ENUM_AVAILABLE_SHARED(_name, _shared, _e) \ -{ \ - .name = (_name "_available"), \ - .shared = _shared, \ - .read = iio_enum_available_read, \ - .private = (uintptr_t)(_e), \ -} - static const struct iio_chan_spec_ext_info ad5766_ext_info[] = { _AD5766_CHAN_EXT_INFO("dither_enable", AD5766_DITHER_ENABLE, @@ -440,10 +433,9 @@ static const struct iio_chan_spec_ext_info ad5766_ext_info[] = { _AD5766_CHAN_EXT_INFO("dither_source", AD5766_DITHER_SOURCE, IIO_SEPARATE), IIO_ENUM("dither_scale", IIO_SEPARATE, &ad5766_dither_scale_enum), - IIO_ENUM_AVAILABLE_SHARED("dither_scale", - IIO_SEPARATE, - &ad5766_dither_scale_enum), - {} + IIO_ENUM_AVAILABLE("dither_scale", IIO_SEPARATE, + &ad5766_dither_scale_enum), + { } }; #define AD576x_CHANNEL(_chan, _bits) { \ @@ -455,6 +447,7 @@ static const struct iio_chan_spec_ext_info ad5766_ext_info[] = { .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \ BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index = (_chan), \ .scan_type = { \ .sign = 'u', \ .realbits = (_bits), \ @@ -503,13 +496,13 @@ static int ad5766_get_output_range(struct ad5766_state *st) int i, ret, min, max, tmp[2]; ret = device_property_read_u32_array(&st->spi->dev, - "output-range-voltage", + "output-range-microvolts", tmp, 2); if (ret) return ret; - min = tmp[0] / 1000; - max = tmp[1] / 1000; + min = tmp[0] / 1000000; + max = tmp[1] / 1000000; for (i = 0; i < ARRAY_SIZE(ad5766_span_tbl); i++) { if (ad5766_span_tbl[i].min != min || ad5766_span_tbl[i].max != max) @@ -576,6 +569,35 @@ static int ad5766_default_setup(struct ad5766_state *st) return __ad5766_spi_write(st, AD5766_CMD_SPAN_REG, st->crt_range); } +static irqreturn_t ad5766_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct iio_buffer *buffer = indio_dev->buffer; + struct ad5766_state *st = iio_priv(indio_dev); + int ret, ch, i; + u16 data[ARRAY_SIZE(ad5766_channels)]; + + ret = iio_pop_from_buffer(buffer, data); + if (ret) + goto done; + + i = 0; + mutex_lock(&st->lock); + for_each_set_bit(ch, indio_dev->active_scan_mask, + st->chip_info->num_channels - 1) + __ad5766_spi_write(st, AD5766_CMD_WR_IN_REG(ch), data[i++]); + + __ad5766_spi_write(st, AD5766_CMD_SW_LDAC, + *indio_dev->active_scan_mask); + mutex_unlock(&st->lock); + +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + static int ad5766_probe(struct spi_device *spi) { enum ad5766_type type; @@ -609,20 +631,29 @@ static int ad5766_probe(struct spi_device *spi) if (ret) return ret; + /* Configure trigger buffer */ + ret = devm_iio_triggered_buffer_setup_ext(&spi->dev, indio_dev, NULL, + ad5766_trigger_handler, + IIO_BUFFER_DIRECTION_OUT, + NULL, + NULL); + if (ret) + return ret; + return devm_iio_device_register(&spi->dev, indio_dev); } static const struct of_device_id ad5766_dt_match[] = { { .compatible = "adi,ad5766" }, { .compatible = "adi,ad5767" }, - {} + { } }; MODULE_DEVICE_TABLE(of, ad5766_dt_match); static const struct spi_device_id ad5766_spi_ids[] = { { "ad5766", ID_AD5766 }, { "ad5767", ID_AD5767 }, - {} + { } }; MODULE_DEVICE_TABLE(spi, ad5766_spi_ids); |