On Thu, 31 Jan 2019 18:20:51 +0200
Stefan Popa wrote:
> The ad7768-1 is a single channel, precision 24-bit analog to digital
> converter (ADC).
>
> This basic patch configures the device in fast mode, with 32 kSPS and
> leaves the default sinc5 filter.
>
> Two data conversion modes are made available. When data is retrieved by
> using the read_raw attribute, one shot single conversion mode is set.
> The continuous conversion mode is enabled when the triggered buffer
> mechanism is used. To assure correct data retrieval, the driver waits
> for the interrupt triggered by the low to high transition of the DRDY
> pin.
>
> Datasheets:
> Link:
> https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
>
> Signed-off-by: Stefan Popa
Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.
Thanks,
Jonathan
> ---
> Changes in v2:
> - Added values to all the elements of ad7768_pwrmode enum.
> - Removed the ad7768_ids enum, as the driver supports only one device.
> - Added a new data union which is part of the ad7768_state struct. This
> union, now includes a d8 field.
> - Used spi_write_then_read() in ad7768_spi_reg_read().
> - Called spi_read() instead of spi_sync_transfer() in
> ad7768_trigger_handler().
> - Used the devm_request_irq() instead of devm_request_threaded_irq();
> called
> iio_trigger_poll() instead of iio_trigger_poll_chained().
> Changes in v3:
> - Changed module license from GPL to GPL v2
>
> MAINTAINERS| 7 +
> drivers/iio/adc/Kconfig| 13 ++
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/ad7768-1.c | 459
> +
> 4 files changed, 480 insertions(+)
> create mode 100644 drivers/iio/adc/ad7768-1.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d039f66..3ba3811 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -862,6 +862,13 @@ S: Supported
> F: drivers/iio/adc/ad7606.c
> F: Documentation/devicetree/bindings/iio/adc/ad7606.txt
>
> +ANALOG DEVICES INC AD7768-1 DRIVER
> +M: Stefan Popa
> +L: linux-...@vger.kernel.org
> +W: http://ez.analog.com/community/linux-device-drivers
> +S: Supported
> +F: drivers/iio/adc/ad7768-1.c
> +
> ANALOG DEVICES INC AD9389B DRIVER
> M: Hans Verkuil
> L: linux-me...@vger.kernel.org
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index f3cc7a3..6c19dfe 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -108,6 +108,19 @@ config AD7766
> To compile this driver as a module, choose M here: the module will be
> called ad7766.
>
> +config AD7768_1
> + tristate "Analog Devices AD7768-1 ADC driver"
> + depends on SPI
> + select IIO_BUFFER
> + select IIO_TRIGGER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say yes here to build support for Analog Devices AD7768-1 SPI
> + simultaneously sampling sigma-delta analog to digital converter (ADC).
> +
> + To compile this driver as a module, choose M here: the module will be
> + called ad7768-1.
> +
> config AD7791
> tristate "Analog Devices AD7791 ADC driver"
> depends on SPI
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index ea50313..9d50f7b 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
> obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
> obj-$(CONFIG_AD7606) += ad7606.o
> obj-$(CONFIG_AD7766) += ad7766.o
> +obj-$(CONFIG_AD7768_1) += ad7768-1.o
> obj-$(CONFIG_AD7791) += ad7791.o
> obj-$(CONFIG_AD7793) += ad7793.o
> obj-$(CONFIG_AD7887) += ad7887.o
> diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
> new file mode 100644
> index 000..78449e9
> --- /dev/null
> +++ b/drivers/iio/adc/ad7768-1.c
> @@ -0,0 +1,459 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Analog Devices AD7768-1 SPI ADC driver
> + *
> + * Copyright 2017 Analog Devices Inc.
> + */
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +
> +/* AD7768 registers definition */
> +#define AD7768_REG_CHIP_TYPE 0x3
> +#define AD7768_REG_PROD_ID_L 0x4
> +#define AD7768_REG_PROD_ID_H 0x5
> +#define AD7768_REG_CHIP_GRADE0x6
> +#define AD7768_REG_SCRATCH_PAD 0x0A
> +#define AD7768_REG_VENDOR_L 0x0C
> +#define AD7768_REG_VENDOR_H 0x0D
> +#define AD7768_REG_INTERFACE_FORMAT 0x14
> +#define AD7768_REG_POWER_CLOCK 0x15
> +#define AD7768_REG_ANALOG0x16
> +#define AD7768_REG_ANALOG2 0x17
> +#define AD7768_REG_CONVERSION0x18
> +#define AD7768_REG_DIGITAL_FILTER0x19
> +#define
