Re: [PATCH v2 3/4] iio: adc: Add support for the GE HealthCare PMC ADC

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On Thu, Oct 03, 2024 at 01:46:40PM +0200, Herve Codina wrote:
> 
> The GE HealthCare PMC Analog to Digital Converter (ADC) is a 16-Channel
> (voltage and current), 16-Bit ADC with an I2C Interface.
> 
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>

Tested-by: Ian Ray <ian.ray@xxxxxxxxxxxxxxxx>

> ---
>  drivers/iio/adc/Kconfig        |  10 ++
>  drivers/iio/adc/Makefile       |   1 +
>  drivers/iio/adc/gehc-pmc-adc.c | 227 +++++++++++++++++++++++++++++++++
>  3 files changed, 238 insertions(+)
>  create mode 100644 drivers/iio/adc/gehc-pmc-adc.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 97ece1a4b7e3..87b20f972c25 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -571,6 +571,16 @@ config FSL_MX25_ADC
>           Generic Conversion Queue driver used for general purpose ADC in the
>           MX25. This driver supports single measurements using the MX25 ADC.
> 
> +config GEHC_PMC_ADC
> +       tristate "GE HealthCare PMC ADC driver"
> +       depends on I2C
> +       help
> +         Say yes here to build support for the GE HealthCare PMC 16-bit
> +         16-Channel ADC.
> +
> +         To compile this driver as a module, choose M here: the module will be
> +         called gehc-pmc-adc.
> +
>  config HI8435
>         tristate "Holt Integrated Circuits HI-8435 threshold detector"
>         select IIO_TRIGGERED_EVENT
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 7b91cd98c0e0..66b36dfe9a28 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_ENVELOPE_DETECTOR) += envelope-detector.o
>  obj-$(CONFIG_EP93XX_ADC) += ep93xx_adc.o
>  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
>  obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
> +obj-$(CONFIG_GEHC_PMC_ADC) += gehc-pmc-adc.o
>  obj-$(CONFIG_HI8435) += hi8435.o
>  obj-$(CONFIG_HX711) += hx711.o
>  obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
> diff --git a/drivers/iio/adc/gehc-pmc-adc.c b/drivers/iio/adc/gehc-pmc-adc.c
> new file mode 100644
> index 000000000000..c70a93f4a61b
> --- /dev/null
> +++ b/drivers/iio/adc/gehc-pmc-adc.c
> @@ -0,0 +1,227 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * The GE HealthCare PMC ADC is a 16-Channel (Voltage and current), 16-Bit
> + * ADC with an I2C Interface.
> + *
> + * Copyright (C) 2024, GE HealthCare
> + *
> + * Authors:
> + * Herve Codina <herve.codina@xxxxxxxxxxx>
> + */
> +#include <dt-bindings/iio/adc/gehc,pmc-adc.h>
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/i2c.h>
> +#include <linux/iio/iio.h>
> +#include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +
> +struct pmc_adc {
> +       struct i2c_client *client;
> +};
> +
> +#define PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION   0x01
> +#define PMC_ADC_CMD_READ_VOLTAGE(_ch)          (0x10 | (_ch))
> +#define PMC_ADC_CMD_READ_CURRENT(_ch)          (0x20 | (_ch))
> +
> +#define PMC_ADC_VOLTAGE_CHANNEL(_ch, _ds_name) {                       \
> +       .type = IIO_VOLTAGE,                                            \
> +       .indexed = 1,                                                   \
> +       .channel = (_ch),                                               \
> +       .address = PMC_ADC_CMD_READ_VOLTAGE(_ch),                       \
> +       .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),             \
> +       .datasheet_name = (_ds_name),                                   \
> +}
> +
> +#define PMC_ADC_CURRENT_CHANNEL(_ch, _ds_name) {                       \
> +       .type = IIO_CURRENT,                                            \
> +       .indexed = 1,                                                   \
> +       .channel = (_ch),                                               \
> +       .address = PMC_ADC_CMD_READ_CURRENT(_ch),                       \
> +       .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),             \
> +       .datasheet_name = (_ds_name),                                   \
> +}
> +
> +static const struct iio_chan_spec pmc_adc_channels[] = {
> +       PMC_ADC_VOLTAGE_CHANNEL(0, "CH0_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(1, "CH1_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(2, "CH2_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(3, "CH3_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(4, "CH4_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(5, "CH5_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(6, "CH6_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(7, "CH7_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(8, "CH8_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(9, "CH9_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(10, "CH10_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(11, "CH11_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(12, "CH12_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(13, "CH13_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(14, "CH14_V"),
> +       PMC_ADC_VOLTAGE_CHANNEL(15, "CH15_V"),
> +
> +       PMC_ADC_CURRENT_CHANNEL(0, "CH0_I"),
> +       PMC_ADC_CURRENT_CHANNEL(1, "CH1_I"),
> +       PMC_ADC_CURRENT_CHANNEL(2, "CH2_I"),
> +       PMC_ADC_CURRENT_CHANNEL(3, "CH3_I"),
> +       PMC_ADC_CURRENT_CHANNEL(4, "CH4_I"),
> +       PMC_ADC_CURRENT_CHANNEL(5, "CH5_I"),
> +       PMC_ADC_CURRENT_CHANNEL(6, "CH6_I"),
> +       PMC_ADC_CURRENT_CHANNEL(7, "CH7_I"),
> +       PMC_ADC_CURRENT_CHANNEL(8, "CH8_I"),
> +       PMC_ADC_CURRENT_CHANNEL(9, "CH9_I"),
> +       PMC_ADC_CURRENT_CHANNEL(10, "CH10_I"),
> +       PMC_ADC_CURRENT_CHANNEL(11, "CH11_I"),
> +       PMC_ADC_CURRENT_CHANNEL(12, "CH12_I"),
> +       PMC_ADC_CURRENT_CHANNEL(13, "CH13_I"),
> +       PMC_ADC_CURRENT_CHANNEL(14, "CH14_I"),
> +       PMC_ADC_CURRENT_CHANNEL(15, "CH15_I"),
> +};
> +
> +static int pmc_adc_read_raw_ch(struct pmc_adc *pmc_adc, u8 cmd, int *val)
> +{
> +       s32 ret;
> +
> +       ret = i2c_smbus_read_word_swapped(pmc_adc->client, cmd);
> +       if (ret < 0) {
> +               dev_err(&pmc_adc->client->dev, "i2c read word failed (%d)\n", ret);
> +               return ret;
> +       }
> +
> +       *val = sign_extend32(ret, 15);
> +       return 0;
> +}
> +
> +static int pmc_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
> +                           int *val, int *val2, long mask)
> +{
> +       struct pmc_adc *pmc_adc = iio_priv(indio_dev);
> +       int ret;
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_PROCESSED:
> +               /* Values are directly read in mV or mA */
> +               ret = pmc_adc_read_raw_ch(pmc_adc, chan->address, val);
> +               if (ret)
> +                       return ret;
> +               return IIO_VAL_INT;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static int pmc_adc_fwnode_xlate(struct iio_dev *indio_dev,
> +                               const struct fwnode_reference_args *iiospec)
> +{
> +       enum iio_chan_type expected_type;
> +       unsigned int i;
> +
> +       /*
> +        * args[0]: Acquisition type (i.e. voltage or current)
> +        * args[1]: PMC ADC channel number
> +        */
> +       if (iiospec->nargs != 2)
> +               return -EINVAL;
> +
> +       switch (iiospec->args[0]) {
> +       case GEHC_PMC_ADC_VOLTAGE:
> +               expected_type = IIO_VOLTAGE;
> +               break;
> +       case GEHC_PMC_ADC_CURRENT:
> +               expected_type = IIO_CURRENT;
> +               break;
> +       default:
> +               dev_err(&indio_dev->dev, "Invalid channel type %llu\n",
> +                       iiospec->args[0]);
> +               return -EINVAL;
> +       }
> +
> +       for (i = 0; i < indio_dev->num_channels; i++)
> +               if (indio_dev->channels[i].type == expected_type &&
> +                   indio_dev->channels[i].channel == iiospec->args[1])
> +                       return i;
> +
> +       dev_err(&indio_dev->dev, "Invalid channel type %llu number %llu\n",
> +               iiospec->args[0], iiospec->args[1]);
> +       return -EINVAL;
> +}
> +
> +static const struct iio_info pmc_adc_info = {
> +       .read_raw = pmc_adc_read_raw,
> +       .fwnode_xlate = pmc_adc_fwnode_xlate,
> +};
> +
> +static const char *const pmc_adc_regulator_names[] = {
> +       "vdd",
> +       "vdda",
> +       "vddio",
> +       "vref",
> +};
> +
> +static int pmc_adc_probe(struct i2c_client *client)
> +{
> +       struct iio_dev *indio_dev;
> +       struct pmc_adc *pmc_adc;
> +       struct clk *clk;
> +       s32 val;
> +       int ret;
> +
> +       ret = devm_regulator_bulk_get_enable(&client->dev, ARRAY_SIZE(pmc_adc_regulator_names),
> +                                            pmc_adc_regulator_names);
> +       if (ret)
> +               return dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
> +
> +       clk = devm_clk_get_optional_enabled(&client->dev, "osc");
> +       if (IS_ERR(clk))
> +               return dev_err_probe(&client->dev, PTR_ERR(clk), "Failed to get osc clock\n");
> +
> +       indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*pmc_adc));
> +       if (!indio_dev)
> +               return -ENOMEM;
> +
> +       pmc_adc = iio_priv(indio_dev);
> +       pmc_adc->client = client;
> +
> +       val = i2c_smbus_read_byte_data(pmc_adc->client, PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION);
> +       if (val < 0)
> +               return dev_err_probe(&client->dev, val, "Failed to get protocol version\n");
> +
> +       if (val != 0x01)
> +               return dev_err_probe(&client->dev, -EINVAL,
> +                                    "Unsupported protocol version 0x%02x\n", val);
> +
> +       indio_dev->name = "pmc_adc";
> +       indio_dev->info = &pmc_adc_info;
> +       indio_dev->channels = pmc_adc_channels;
> +       indio_dev->num_channels = ARRAY_SIZE(pmc_adc_channels);
> +
> +       return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static const struct of_device_id pmc_adc_of_match[] = {
> +       { .compatible = "gehc,pmc-adc"},
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, pmc_adc_of_match);
> +
> +static const struct i2c_device_id pmc_adc_id_table[] = {
> +       { "pmc-adc" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(i2c, pmc_adc_id_table);
> +
> +static struct i2c_driver pmc_adc_i2c_driver = {
> +       .driver  = {
> +               .name = "pmc-adc",
> +               .of_match_table = pmc_adc_of_match,
> +       },
> +       .id_table = pmc_adc_id_table,
> +       .probe  = pmc_adc_probe,
> +};
> +
> +module_i2c_driver(pmc_adc_i2c_driver);
> +
> +MODULE_AUTHOR("Herve Codina <herve.codina@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("GE HealthCare PMC ADC driver");
> +MODULE_LICENSE("GPL");
> --
> 2.46.1
> 
> 




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