On Mon, 9 Dec 2019 21:32:47 +0100
Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> wrote:
> This allows to share most of this driver for the ltc2496 driver added in
> the next commit that is an SPI variant of the ltc2497. Initially I named
> the generic part ltc249x, but wild card names are frowned upon, so the
> generic part is called ltc2497-core even though it's not obvious that
> this is then to be reused for the ltc2496 driver.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/adc/Makefile | 2 +-
> drivers/iio/adc/ltc2497-core.c | 243 +++++++++++++++++++++++++++++++++
> drivers/iio/adc/ltc2497.c | 234 ++++---------------------------
> drivers/iio/adc/ltc2497.h | 18 +++
> 4 files changed, 288 insertions(+), 209 deletions(-)
> create mode 100644 drivers/iio/adc/ltc2497-core.c
> create mode 100644 drivers/iio/adc/ltc2497.h
>
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index ef9cc485fb67..ee0c8dcfb501 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -47,7 +47,7 @@ obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
> obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
> obj-$(CONFIG_LTC2471) += ltc2471.o
> obj-$(CONFIG_LTC2485) += ltc2485.o
> -obj-$(CONFIG_LTC2497) += ltc2497.o
> +obj-$(CONFIG_LTC2497) += ltc2497.o ltc2497-core.o
> obj-$(CONFIG_MAX1027) += max1027.o
> obj-$(CONFIG_MAX11100) += max11100.o
> obj-$(CONFIG_MAX1118) += max1118.o
> diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c
> new file mode 100644
> index 000000000000..f5f7039caacc
> --- /dev/null
> +++ b/drivers/iio/adc/ltc2497-core.c
> @@ -0,0 +1,243 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ltc2497-core.c - Common code for Analog Devices/Linear Technology
> + * LTC2496 and LTC2497 ADCs
> + *
> + * Copyright (C) 2017 Analog Devices Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/driver.h>
> +#include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include "ltc2497.h"
> +
> +#define LTC2497_SGL BIT(4)
> +#define LTC2497_DIFF 0
> +#define LTC2497_SIGN BIT(3)
> +
> +static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata)
> +{
> + s64 time_elapsed;
> +
> + time_elapsed = ktime_ms_delta(ktime_get(), ddata->time_prev);
> +
> + if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
> + /* delay if conversion time not passed
> + * since last read or write
> + */
> + if (msleep_interruptible(
> + LTC2497_CONVERSION_TIME_MS - time_elapsed))
> + return -ERESTARTSYS;
> +
> + return 0;
> + }
> +
> + if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
> + /* We're in automatic mode -
> + * so the last reading is still not outdated
> + */
> + return 0;
> + }
> +
> + return 1;
> +}
> +
> +static int ltc2497core_read(struct ltc2497core_driverdata *ddata, u8 address, int *val)
> +{
> + int ret;
> +
> + ret = ltc2497core_wait_conv(ddata);
> + if (ret < 0)
> + return ret;
> +
> + if (ret || ddata->addr_prev != address) {
> + ret = ddata->result_and_measure(ddata, address, NULL);
> + if (ret < 0)
> + return ret;
> + ddata->addr_prev = address;
> +
> + if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
> + return -ERESTARTSYS;
> + }
> +
> + ret = ddata->result_and_measure(ddata, address, val);
> + if (ret < 0)
> + return ret;
> +
> + ddata->time_prev = ktime_get();
> +
> + return ret;
> +}
> +
> +static int ltc2497core_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
> + int ret;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + mutex_lock(&indio_dev->mlock);
> + ret = ltc2497core_read(ddata, chan->address, val);
> + mutex_unlock(&indio_dev->mlock);
> + if (ret < 0)
> + return ret;
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + ret = regulator_get_voltage(ddata->ref);
> + if (ret < 0)
> + return ret;
> +
> + *val = ret / 1000;
> + *val2 = 17;
> +
> + return IIO_VAL_FRACTIONAL_LOG2;
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .channel = (_chan), \
> + .address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> + .datasheet_name = (_ds_name), \
> +}
> +
> +#define LTC2497_CHAN_DIFF(_chan, _addr) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
> + .channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
> + .address = (_addr | _chan), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> + .differential = 1, \
> +}
> +
> +static const struct iio_chan_spec ltc2497core_channel[] = {
> + LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
> + LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
> + LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
> + LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
> + LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
> + LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
> + LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
> + LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
> + LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
> + LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
> + LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
> + LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
> + LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
> + LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
> + LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
> + LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
> + LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
> + LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
> + LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
> +};
> +
> +static const struct iio_info ltc2497core_info = {
> + .read_raw = ltc2497core_read_raw,
> +};
> +
> +int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev)
> +{
> + struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
> + int ret;
> +
> + indio_dev->dev.parent = dev;
> + indio_dev->name = dev_name(dev);
> + indio_dev->info = <c2497core_info;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->channels = ltc2497core_channel;
> + indio_dev->num_channels = ARRAY_SIZE(ltc2497core_channel);
> +
> + ret = ddata->result_and_measure(ddata, LTC2497_CONFIG_DEFAULT, NULL);
> + if (ret < 0)
> + return ret;
> +
> + ddata->ref = devm_regulator_get(dev, "vref");
> + if (IS_ERR(ddata->ref)) {
> + if (PTR_ERR(ddata->ref) != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get vref regulator: %pe\n",
> + ddata->ref);
> +
> + return PTR_ERR(ddata->ref);
> + }
> +
> + ret = regulator_enable(ddata->ref);
> + if (ret < 0) {
> + dev_err(dev, "Failed to enable vref regulator: %pe\n",
> + ERR_PTR(ret));
> + return ret;
> + }
> +
> + if (dev->platform_data) {
> + struct iio_map *plat_data;
> +
> + plat_data = (struct iio_map *)dev->platform_data;
> +
> + ret = iio_map_array_register(indio_dev, plat_data);
> + if (ret) {
> + dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
> + goto err_regulator_disable;
> + }
> + }
> +
> + ddata->addr_prev = LTC2497_CONFIG_DEFAULT;
> + ddata->time_prev = ktime_get();
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0)
> + goto err_array_unregister;
> +
> + return 0;
> +
> +err_array_unregister:
> + iio_map_array_unregister(indio_dev);
> +
> +err_regulator_disable:
> + regulator_disable(ddata->ref);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_NS(ltc2497core_probe, LTC2497);
> +
> +void ltc2497core_remove(struct iio_dev *indio_dev)
> +{
> + struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> +
> + iio_map_array_unregister(indio_dev);
> +
> + regulator_disable(ddata->ref);
> +}
> +EXPORT_SYMBOL_NS(ltc2497core_remove, LTC2497);
> +
> +MODULE_DESCRIPTION("common code for LTC2496/LTC2497 drivers");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c
> index 470406032720..5db63d7c6bc5 100644
> --- a/drivers/iio/adc/ltc2497.c
> +++ b/drivers/iio/adc/ltc2497.c
> @@ -7,27 +7,18 @@
> * Datasheet: http://cds.linear.com/docs/en/datasheet/2497fd.pdf
> */
>
> -#include <linux/delay.h>
> #include <linux/i2c.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/driver.h>
> -#include <linux/iio/sysfs.h>
> #include <linux/module.h>
> #include <linux/of.h>
> -#include <linux/regulator/consumer.h>
>
> -#define LTC2497_ENABLE 0xA0
> -#define LTC2497_SGL BIT(4)
> -#define LTC2497_DIFF 0
> -#define LTC2497_SIGN BIT(3)
> -#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE
> -#define LTC2497_CONVERSION_TIME_MS 150ULL
> +#include "ltc2497.h"
>
> -struct ltc2497_st {
> +struct ltc2497_driverdata {
> + /* this must be the first member */
> + struct ltc2497core_driverdata common_ddata;
> struct i2c_client *client;
> - struct regulator *ref;
> - ktime_t time_prev;
> - u8 addr_prev;
> /*
> * DMA (thus cache coherency maintenance) requires the
> * transfer buffers to live in their own cache lines.
> @@ -35,232 +26,59 @@ struct ltc2497_st {
> __be32 buf ____cacheline_aligned;
> };
>
> -static int ltc2497_wait_conv(struct ltc2497_st *st)
> +static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata,
> + u8 address, int *val)
> {
> - s64 time_elapsed;
> -
> - time_elapsed = ktime_ms_delta(ktime_get(), st->time_prev);
> -
> - if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
> - /* delay if conversion time not passed
> - * since last read or write
> - */
> - if (msleep_interruptible(
> - LTC2497_CONVERSION_TIME_MS - time_elapsed))
> - return -ERESTARTSYS;
> -
> - return 0;
> - }
> -
> - if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
> - /* We're in automatic mode -
> - * so the last reading is stil not outdated
> - */
> - return 0;
> - }
> -
> - return 1;
> -}
> -
> -static int ltc2497_read(struct ltc2497_st *st, u8 address, int *val)
> -{
> - struct i2c_client *client = st->client;
> - int ret;
> -
> - ret = ltc2497_wait_conv(st);
> - if (ret < 0)
> - return ret;
> -
> - if (ret || st->addr_prev != address) {
> - ret = i2c_smbus_write_byte(st->client,
> - LTC2497_ENABLE | address);
> - if (ret < 0)
> - return ret;
> - st->addr_prev = address;
> - if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
> - return -ERESTARTSYS;
> - }
> - ret = i2c_master_recv(client, (char *)&st->buf, 3);
> - if (ret < 0) {
> - dev_err(&client->dev, "i2c_master_recv failed\n");
> - return ret;
> - }
> - st->time_prev = ktime_get();
> -
> - /* convert and shift the result,
> - * and finally convert from offset binary to signed integer
> - */
> - *val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
> -
> - return ret;
> -}
> -
> -static int ltc2497_read_raw(struct iio_dev *indio_dev,
> - struct iio_chan_spec const *chan,
> - int *val, int *val2, long mask)
> -{
> - struct ltc2497_st *st = iio_priv(indio_dev);
> + struct ltc2497_driverdata *st =
> + container_of(ddata, struct ltc2497_driverdata, common_ddata);
> int ret;
>
> - switch (mask) {
> - case IIO_CHAN_INFO_RAW:
> - mutex_lock(&indio_dev->mlock);
> - ret = ltc2497_read(st, chan->address, val);
> - mutex_unlock(&indio_dev->mlock);
> - if (ret < 0)
> - return ret;
> -
> - return IIO_VAL_INT;
> -
> - case IIO_CHAN_INFO_SCALE:
> - ret = regulator_get_voltage(st->ref);
> - if (ret < 0)
> + if (val) {
> + ret = i2c_master_recv(st->client, (char *)&st->buf, 3);
> + if (ret < 0) {
> + dev_err(&st->client->dev, "i2c_master_recv failed\n");
> return ret;
> + }
>
> - *val = ret / 1000;
> - *val2 = 17;
> -
> - return IIO_VAL_FRACTIONAL_LOG2;
> -
> - default:
> - return -EINVAL;
> + *val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
> }
> -}
>
> -#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
> - .type = IIO_VOLTAGE, \
> - .indexed = 1, \
> - .channel = (_chan), \
> - .address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> - .datasheet_name = (_ds_name), \
> -}
> -
> -#define LTC2497_CHAN_DIFF(_chan, _addr) { \
> - .type = IIO_VOLTAGE, \
> - .indexed = 1, \
> - .channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
> - .channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
> - .address = (_addr | _chan), \
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> - .differential = 1, \
> + ret = i2c_smbus_write_byte(st->client,
> + LTC2497_ENABLE | address);
> + if (ret)
> + dev_err(&st->client->dev, "i2c transfer failed: %pe\n",
> + ERR_PTR(ret));
> + return ret;
> }
>
> -static const struct iio_chan_spec ltc2497_channel[] = {
> - LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
> - LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
> - LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
> - LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
> - LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
> - LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
> - LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
> - LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
> - LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
> - LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
> - LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
> - LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
> - LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
> - LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
> - LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
> - LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
> - LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
> - LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
> - LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
> -};
> -
> -static const struct iio_info ltc2497_info = {
> - .read_raw = ltc2497_read_raw,
> -};
> -
> static int ltc2497_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct iio_dev *indio_dev;
> - struct ltc2497_st *st;
> - struct iio_map *plat_data;
> - int ret;
> + struct ltc2497_driverdata *st;
> + struct device *dev = &client->dev;
>
> if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
> I2C_FUNC_SMBUS_WRITE_BYTE))
> return -EOPNOTSUPP;
>
> - indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
> + indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
> if (!indio_dev)
> return -ENOMEM;
>
> st = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> st->client = client;
> + st->common_ddata.result_and_measure = ltc2497_result_and_measure;
>
> - indio_dev->dev.parent = &client->dev;
> - indio_dev->name = id->name;
> - indio_dev->info = <c2497_info;
> - indio_dev->modes = INDIO_DIRECT_MODE;
> - indio_dev->channels = ltc2497_channel;
> - indio_dev->num_channels = ARRAY_SIZE(ltc2497_channel);
> -
> - st->ref = devm_regulator_get(&client->dev, "vref");
> - if (IS_ERR(st->ref))
> - return PTR_ERR(st->ref);
> -
> - ret = regulator_enable(st->ref);
> - if (ret < 0)
> - return ret;
> -
> - if (client->dev.platform_data) {
> - plat_data = ((struct iio_map *)client->dev.platform_data);
> - ret = iio_map_array_register(indio_dev, plat_data);
> - if (ret) {
> - dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
> - goto err_regulator_disable;
> - }
> - }
> -
> - ret = i2c_smbus_write_byte(st->client, LTC2497_CONFIG_DEFAULT);
> - if (ret < 0)
> - goto err_array_unregister;
> -
> - st->addr_prev = LTC2497_CONFIG_DEFAULT;
> - st->time_prev = ktime_get();
> -
> - ret = iio_device_register(indio_dev);
> - if (ret < 0)
> - goto err_array_unregister;
> -
> - return 0;
> -
> -err_array_unregister:
> - iio_map_array_unregister(indio_dev);
> -
> -err_regulator_disable:
> - regulator_disable(st->ref);
> -
> - return ret;
> + return ltc2497core_probe(dev, indio_dev);
> }
>
> static int ltc2497_remove(struct i2c_client *client)
> {
> struct iio_dev *indio_dev = i2c_get_clientdata(client);
> - struct ltc2497_st *st = iio_priv(indio_dev);
>
> - iio_map_array_unregister(indio_dev);
> - iio_device_unregister(indio_dev);
> - regulator_disable(st->ref);
> + ltc2497core_remove(indio_dev);
>
> return 0;
> }
> diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h
> new file mode 100644
> index 000000000000..d0b42dd6b8ad
> --- /dev/null
> +++ b/drivers/iio/adc/ltc2497.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#define LTC2497_ENABLE 0xA0
> +#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE
> +#define LTC2497_CONVERSION_TIME_MS 150ULL
> +
> +struct ltc2497core_driverdata {
> + struct regulator *ref;
> + ktime_t time_prev;
> + u8 addr_prev;
> + int (*result_and_measure)(struct ltc2497core_driverdata *ddata,
> + u8 address, int *val);
> +};
> +
> +int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev);
> +void ltc2497core_remove(struct iio_dev *indio_dev);
> +
> +MODULE_IMPORT_NS(LTC2497);
