It is a driver for Texas Instruments Dual, 12-Bit Serial Input Digital-to-Analog Converter. Datasheet of this chip: http://www.ti.com/lit/ds/sbas106/sbas106.pdf Signed-off-by: Ricardo Ribalda Delgado <ricardo@xxxxxxxxxxx> --- v2: Fix range MAINTAINERS | 6 ++ drivers/iio/dac/Kconfig | 10 +++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ti-dac7612.c | 169 +++++++++++++++++++++++++++++++++++ 4 files changed, 186 insertions(+) create mode 100644 drivers/iio/dac/ti-dac7612.c diff --git a/MAINTAINERS b/MAINTAINERS index d039f66a5cef..30ba5435906b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14877,6 +14877,12 @@ F: Documentation/devicetree/bindings/clock/ti,sci-clk.txt F: drivers/clk/keystone/sci-clk.c F: drivers/reset/reset-ti-sci.c +Texas Instruments' DAC7612 DAC Driver +M: Ricardo Ribalda <ricardo@xxxxxxxxxxx> +L: linux-iio@xxxxxxxxxxxxxxx +S: Supported +F: drivers/iio/dac/ti-dac7612.c + THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER M: Hans Verkuil <hverkuil@xxxxxxxxx> L: linux-media@xxxxxxxxxxxxxxx diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index f28daf67db6a..fbef9107acad 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -375,6 +375,16 @@ config TI_DAC7311 If compiled as a module, it will be called ti-dac7311. +config TI_DAC7612 + tristate "Texas Instruments 12-bit 2-channel DAC driver" + depends on SPI_MASTER && GPIOLIB + help + Driver for the Texas Instruments DAC7612, DAC7612U, DAC7612UB + The driver hand drive the load pin automatically, otherwise + it needs to be toggled manually. + + If compiled as a module, it will be called ti-dac7612. + config VF610_DAC tristate "Vybrid vf610 DAC driver" depends on OF diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index f0a37c93de8e..1369fa1d2f0e 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -41,4 +41,5 @@ obj-$(CONFIG_STM32_DAC) += stm32-dac.o obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o obj-$(CONFIG_TI_DAC7311) += ti-dac7311.o +obj-$(CONFIG_TI_DAC7612) += ti-dac7612.o obj-$(CONFIG_VF610_DAC) += vf610_dac.o diff --git a/drivers/iio/dac/ti-dac7612.c b/drivers/iio/dac/ti-dac7612.c new file mode 100644 index 000000000000..278406f69e0c --- /dev/null +++ b/drivers/iio/dac/ti-dac7612.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DAC7612 Dual, 12-Bit Serial input Digital-to-Analog Converter + * + * Copyright 2019 Qtechnology A/S + * 2019 Ricardo Ribalda <ricardo@xxxxxxxxxxx> + * + * Licensed under the GPL-2. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/gpio/consumer.h> +#include <linux/iio/iio.h> + +#define NUM_CHANS 2 +#define RESOLUTION 12 + +struct dac7612 { + struct spi_device *spi; + struct gpio_desc *nld; + uint16_t cache[NUM_CHANS]; +}; + +static int dac7612_cmd_single(struct dac7612 *priv, int channel, u16 val) +{ + uint8_t buffer[2]; + int ret; + + if (channel >= NUM_CHANS) + return -EINVAL; + + buffer[0] = BIT(5) | (channel << 4) | (val >> 8); + buffer[1] = val & 0xff; + + priv->cache[channel] = val; + + ret = spi_write(priv->spi, buffer, sizeof(buffer)); + if (ret) + return ret; + + gpiod_set_value(priv->nld, 0); + gpiod_set_value(priv->nld, 1); + + return 0; +} + +#define dac7612_CHANNEL(chan, name) { \ + .type = IIO_VOLTAGE, \ + .channel = (chan), \ + .address = (chan), \ + .indexed = true, \ + .output = true, \ + .datasheet_name = name, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = RESOLUTION, \ + .storagebits = RESOLUTION, \ + }, \ +} + +static const struct iio_chan_spec dac7612_channels[] = { + dac7612_CHANNEL(0, "OUTA"), + dac7612_CHANNEL(1, "OUTB"), +}; + +static int dac7612_read_raw(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct dac7612 *priv; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + priv = iio_priv(iio_dev); + *val = priv->cache[chan->channel]; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = 1000000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + +static int dac7612_write_raw(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + int val, int val2, long mask) +{ + struct dac7612 *priv; + int ret; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + if ((val >= BIT(RESOLUTION)) || val < 0) + return -EINVAL; + + priv = iio_priv(iio_dev); + if (val == priv->cache[chan->channel]) + return 0; + + mutex_lock(&iio_dev->mlock); + ret = dac7612_cmd_single(priv, chan->channel, val); + mutex_unlock(&iio_dev->mlock); + + return ret; +} + +static const struct iio_info dac7612_info = { + .read_raw = dac7612_read_raw, + .write_raw = dac7612_write_raw, +}; + +static int dac7612_probe(struct spi_device *spi) +{ + struct iio_dev *iio_dev; + struct dac7612 *priv; + int i; + int ret; + + iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv)); + if (!iio_dev) + return -ENOMEM; + + priv = iio_priv(iio_dev); + priv->nld = devm_gpiod_get_optional(&spi->dev, "nLD", GPIOD_OUT_HIGH); + if (IS_ERR(priv->nld)) + return PTR_ERR(priv->nld); + priv->spi = spi; + spi_set_drvdata(spi, iio_dev); + iio_dev->dev.parent = &spi->dev; + iio_dev->info = &dac7612_info; + iio_dev->modes = INDIO_DIRECT_MODE; + iio_dev->channels = dac7612_channels; + iio_dev->num_channels = NUM_CHANS; + iio_dev->name = spi_get_device_id(spi)->name; + + for (i = 0; i < NUM_CHANS; i++) { + ret = dac7612_cmd_single(priv, i, 0); + if (ret) + return ret; + } + + return devm_iio_device_register(&spi->dev, iio_dev); +} + +static const struct spi_device_id dac7612_id[] = { + {"ti-dac7612"}, + {} +}; +MODULE_DEVICE_TABLE(spi, dac7612_id); + +static struct spi_driver dac7612_driver = { + .driver = { + .name = "ti-dac7612", + }, + .probe = dac7612_probe, + .id_table = dac7612_id, +}; +module_spi_driver(dac7612_driver); + +MODULE_AUTHOR("Ricardo Ribalda <ricardo@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments DAC7612 DAC driver"); +MODULE_LICENSE("GPL v2"); -- 2.20.1
