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Wed, 13 Dec 2023 01:09:30 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785157202230272474 X-GMAIL-MSGID: 1785157202230272474 Add a driver for generic serial shift register DACs like TI DAC714. Signed-off-by: Mike Looijmans --- .../devicetree/bindings/iio/dac/spidac.yaml | 69 +++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/spidac.yaml diff --git a/Documentation/devicetree/bindings/iio/dac/spidac.yaml b/Documentation/devicetree/bindings/iio/dac/spidac.yaml new file mode 100644 index 000000000000..be98da728594 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/spidac.yaml @@ -0,0 +1,69 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/dac/spidac.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic "shift register" SPI DAC + +description: + Supports simple SPI "shift register" DACs, like TI's DAC714. These DACs have + no control registers or commands, they just use a clock and serial data to + shift in a raw DAC value. Multiple DACs can be daisy-chained together. + +maintainers: + - Mike Looijmans + +properties: + compatible: + enum: + - spi-dac + - ti,dac714 + + reg: + maxItems: 1 + + ldac-gpios: + description: + LDAC pin to be used as a hardware trigger to update the DAC outputs. Not + needed when the DACs use the chip select to update their output. + maxItems: 1 + + reset-gpios: + description: + Optional reset pin that resets all DACs. + maxItems: 1 + + num-channels: + description: + Number of channels (usually the number of DAC chips in series) + $ref: /schemas/types.yaml#/definitions/uint32 + + bits-per-channel: + description: + Number of bits for each DAC output. + $ref: /schemas/types.yaml#/definitions/uint32 + +required: + - compatible + - reg + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +unevaluatedProperties: false + +examples: + - | + #include + spi { + #address-cells = <1>; + #size-cells = <0>; + + dac@1 { + compatible = "spidac"; + reg = <0x1>; + ldac-gpios = <&gpio 42 GPIO_ACTIVE_LOW>; + }; + }; +... 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Wed, 13 Dec 2023 01:09:40 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785157211034610495 X-GMAIL-MSGID: 1785157211034610495 Add a driver for generic serial shift register DACs like TI DAC714. Signed-off-by: Mike Looijmans --- drivers/iio/dac/Kconfig | 11 ++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/spi-dac.c | 212 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 224 insertions(+) create mode 100644 drivers/iio/dac/spi-dac.c diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 93b8be183de6..bb35d901ee57 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -410,6 +410,17 @@ config MCP4922 To compile this driver as a module, choose M here: the module will be called mcp4922. +config SPI_DAC + tristate "SPI shift register DAC driver" + depends on SPI + help + Driver for an array of shift-register DACs, like the TI DAC714. + The driver shifts the DAC values into the registers in a SPI + transfer, then optionally toggles a GPIO to latch the values. + + To compile this driver as a module, choose M here: the module + will be called spi-dac. + config STM32_DAC tristate "STMicroelectronics STM32 DAC" depends on (ARCH_STM32 && OF) || COMPILE_TEST diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 5b2bac900d5a..33748799b0f0 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -45,6 +45,7 @@ obj-$(CONFIG_MCP4728) += mcp4728.o obj-$(CONFIG_MCP4922) += mcp4922.o obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o obj-$(CONFIG_STM32_DAC) += stm32-dac.o +obj-$(CONFIG_SPI_DAC) += spi-dac.o obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o obj-$(CONFIG_TI_DAC7311) += ti-dac7311.o diff --git a/drivers/iio/dac/spi-dac.c b/drivers/iio/dac/spi-dac.c new file mode 100644 index 000000000000..0c0113d51604 --- /dev/null +++ b/drivers/iio/dac/spi-dac.c @@ -0,0 +1,212 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SPI generic shift register Serial input Digital-to-Analog Converter + * For example, TI DAC714 + * + * Copyright 2023 Topic Embedded Systems + */ +#include +#include +#include +#include +#include +#include + +struct spidac { + struct spi_device *spi; + struct gpio_desc *loaddacs; + u8 *data; /* SPI buffer */ + u32 data_size; + /* Protect the data buffer and update sequence */ + struct mutex lock; +}; + +static int spidac_cmd_single(struct spidac *priv, + const struct iio_chan_spec *chan, int val) +{ + u8 *data = priv->data + chan->address; + unsigned int bytes = chan->scan_type.storagebits >> 3; + int ret; + unsigned int i; + + /* Write big-endian value into data */ + data += bytes - 1; + for (i = 0; i < bytes; i++, val >>= 8, data--) + *data = val & 0xff; + + ret = spi_write(priv->spi, priv->data, priv->data_size); + if (ret) + return ret; + + gpiod_set_value(priv->loaddacs, 1); + udelay(1); + gpiod_set_value(priv->loaddacs, 0); + + return 0; +} + +static int spidac_decode(struct spidac *priv, const struct iio_chan_spec *chan) +{ + u8 *data = priv->data + chan->address; + unsigned int bytes = chan->scan_type.storagebits >> 3; + unsigned int i; + int val = 0; + + /* Read big-endian value from data */ + for (i = 0; i < bytes; i++, data++) + val = (val << 8) | *data; + + return val; +} + +static int spidac_read_raw(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct spidac *priv; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + priv = iio_priv(iio_dev); + + mutex_lock(&priv->lock); + *val = spidac_decode(priv, chan); + mutex_unlock(&priv->lock); + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = 1; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int spidac_write_raw(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + int val, int val2, long mask) +{ + struct spidac *priv = iio_priv(iio_dev); + int ret; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + mutex_lock(&priv->lock); + ret = spidac_cmd_single(priv, chan, val); + mutex_unlock(&priv->lock); + + return ret; +} + +static const struct iio_info spidac_info = { + .read_raw = spidac_read_raw, + .write_raw = spidac_write_raw, +}; + +static int spidac_probe(struct spi_device *spi) +{ + struct iio_dev *iio_dev; + struct spidac *priv; + struct iio_chan_spec *channels; + struct gpio_desc *reset_gpio; + u32 num_channels; + u32 bits_per_channel; + u32 bytes_per_channel; + u32 i; + + iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv)); + if (!iio_dev) + return -ENOMEM; + + priv = iio_priv(iio_dev); + priv->loaddacs = devm_gpiod_get_optional(&spi->dev, "ldac", + GPIOD_OUT_LOW); + if (IS_ERR(priv->loaddacs)) + return PTR_ERR(priv->loaddacs); + + reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpio)) + return PTR_ERR(reset_gpio); + + priv->spi = spi; + spi_set_drvdata(spi, iio_dev); + num_channels = 1; + bits_per_channel = 16; + + device_property_read_u32(&spi->dev, "num-channels", &num_channels); + device_property_read_u32(&spi->dev, "bits-per-channel", + &bits_per_channel); + bytes_per_channel = DIV_ROUND_UP(bits_per_channel, 8); + + channels = devm_kcalloc(&spi->dev, num_channels, sizeof(*channels), + GFP_KERNEL); + if (!channels) + return -ENOMEM; + + priv->data_size = num_channels * bytes_per_channel; + priv->data = devm_kzalloc(&spi->dev, priv->data_size, + GFP_KERNEL | GFP_DMA); + if (!priv->data) + return -ENOMEM; + + for (i = 0; i < num_channels; i++) { + struct iio_chan_spec *chan = &channels[i]; + + chan->type = IIO_VOLTAGE; + chan->indexed = 1; + chan->output = 1; + chan->channel = i; + chan->address = i * bytes_per_channel; + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE); + chan->scan_type.sign = 's'; + chan->scan_type.realbits = bits_per_channel; + chan->scan_type.storagebits = bits_per_channel; + } + + iio_dev->info = &spidac_info; + iio_dev->modes = INDIO_DIRECT_MODE; + iio_dev->channels = channels; + iio_dev->num_channels = num_channels; + iio_dev->name = spi_get_device_id(spi)->name; + + mutex_init(&priv->lock); + + if (reset_gpio) { + udelay(1); + gpiod_set_value(reset_gpio, 0); + } + + return devm_iio_device_register(&spi->dev, iio_dev); +} + +static const struct spi_device_id spidac_id[] = { + {"spi-dac"}, + {} +}; +MODULE_DEVICE_TABLE(spi, spidac_id); + +static const struct of_device_id spidac_of_match[] = { + { .compatible = "spi-dac" }, + { .compatible = "ti,dac714" }, + { }, +}; +MODULE_DEVICE_TABLE(of, spidac_of_match); + +static struct spi_driver spidac_driver = { + .driver = { + .name = "spi-dac", + .of_match_table = spidac_of_match, + }, + .probe = spidac_probe, + .id_table = spidac_id, +}; +module_spi_driver(spidac_driver); + +MODULE_AUTHOR("Mike Looijmans "); +MODULE_DESCRIPTION("SPI shift register DAC driver"); +MODULE_LICENSE("GPL");