On Thu, 14 Nov 2019 11:51:58 +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. > > Also generalize the entry in MAINTAINER to cover the newly introduced > files. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> I'm fairly sure there is no way of easily enforcing data being it's own cacheline whilst on the stack. I would just put that back in the generic structure and add a note saying it's only used for the SPI users of the core structure. Jonathan > --- > MAINTAINERS | 2 +- > drivers/iio/adc/Makefile | 2 +- > drivers/iio/adc/ltc2497.c | 237 +++++------------------------------- > drivers/iio/adc/ltc249x.c | 244 ++++++++++++++++++++++++++++++++++++++ > drivers/iio/adc/ltc249x.h | 18 +++ > 5 files changed, 292 insertions(+), 211 deletions(-) > create mode 100644 drivers/iio/adc/ltc249x.c > create mode 100644 drivers/iio/adc/ltc249x.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index eb19fad370d7..8b1211038617 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1029,7 +1029,7 @@ S: Supported > F: Documentation/ABI/testing/sysfs-bus-iio-frequency-ad9523 > F: Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4350 > F: drivers/iio/*/ad* > -F: drivers/iio/adc/ltc2497* > +F: drivers/iio/adc/ltc249* > X: drivers/iio/*/adjd* > F: drivers/staging/iio/*/ad* > > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index ef9cc485fb67..660242c2cca7 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 ltc249x.o > obj-$(CONFIG_MAX1027) += max1027.o > obj-$(CONFIG_MAX11100) += max11100.o > obj-$(CONFIG_MAX1118) += max1118.o > diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c > index 470406032720..640c512c5090 100644 > --- a/drivers/iio/adc/ltc2497.c > +++ b/drivers/iio/adc/ltc2497.c > @@ -7,260 +7,79 @@ > * 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 "ltc249x.h" > > struct ltc2497_st { > + /* this must be the first member */ > + struct ltc249x_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. > - */ > - __be32 buf ____cacheline_aligned; > }; > > -static int ltc2497_wait_conv(struct ltc2497_st *st) > -{ > - 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) > +static int ltc2497_result_and_measure(struct ltc249x_driverdata *ddata, > + 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(); > + struct ltc2497_st *st = > + container_of(ddata, struct ltc2497_st, common_ddata); > > - /* convert and shift the result, > - * and finally convert from offset binary to signed integer > + /* > + * DMA (thus cache coherency maintenance) requires the > + * transfer buffers to live in their own cache lines. > */ > - *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); > + __be32 buf ____cacheline_aligned; >From what I recall that has no useful affect on the stack. Can only be used to enforce padding within a structure on the heap. Directly allocating from the heap here would also provide relevant guarantees. > 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) > + if (val) { > + ret = i2c_master_recv(st->client, (char *)&buf, 3); > + if (ret < 0) { > + dev_err(&st->client->dev, "i2c_master_recv failed\n"); > return ret; > + } > > - return IIO_VAL_INT; > - > - case IIO_CHAN_INFO_SCALE: > - ret = regulator_get_voltage(st->ref); > - if (ret < 0) > - return ret; > - > - *val = ret / 1000; > - *val2 = 17; > - > - return IIO_VAL_FRACTIONAL_LOG2; > - > - default: > - return -EINVAL; > + *val = (be32_to_cpu(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, > + LTC249X_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 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 ltc249x_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); > + ltc249x_remove(indio_dev); > > return 0; > } > diff --git a/drivers/iio/adc/ltc249x.c b/drivers/iio/adc/ltc249x.c > new file mode 100644 > index 000000000000..7af1086236c0 > --- /dev/null > +++ b/drivers/iio/adc/ltc249x.c > @@ -0,0 +1,244 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * ltc249x.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 "ltc249x.h" > + > +#define LTC249X_SGL BIT(4) > +#define LTC249X_DIFF 0 > +#define LTC249X_SIGN BIT(3) > + > +static int ltc249x_wait_conv(struct ltc249x_driverdata *ddata) > +{ > + s64 time_elapsed; > + > + time_elapsed = ktime_ms_delta(ktime_get(), ddata->time_prev); > + > + if (time_elapsed < LTC249X_CONVERSION_TIME_MS) { > + /* delay if conversion time not passed > + * since last read or write > + */ > + if (msleep_interruptible( > + LTC249X_CONVERSION_TIME_MS - time_elapsed)) > + return -ERESTARTSYS; > + > + return 0; > + } > + > + if (time_elapsed - LTC249X_CONVERSION_TIME_MS <= 0) { > + /* We're in automatic mode - > + * so the last reading is still not outdated > + */ > + return 0; > + } > + > + return 1; > +} > + > +static int ltc249x_read(struct ltc249x_driverdata *ddata, u8 address, int *val) > +{ > + int ret; > + > + ret = ltc249x_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(LTC249X_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 ltc249x_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct ltc249x_driverdata *ddata = iio_priv(indio_dev); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + mutex_lock(&indio_dev->mlock); > + ret = ltc249x_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 LTC249X_CHAN(_chan, _addr, _ds_name) { \ > + .type = IIO_VOLTAGE, \ > + .indexed = 1, \ > + .channel = (_chan), \ > + .address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC249X_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 LTC249X_CHAN_DIFF(_chan, _addr) { \ > + .type = IIO_VOLTAGE, \ > + .indexed = 1, \ > + .channel = (_chan) * 2 + ((_addr) & LTC249X_SIGN ? 1 : 0), \ > + .channel2 = (_chan) * 2 + ((_addr) & LTC249X_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 ltc249x_channel[] = { > + LTC249X_CHAN(0, LTC249X_SGL, "CH0"), > + LTC249X_CHAN(1, LTC249X_SGL, "CH1"), > + LTC249X_CHAN(2, LTC249X_SGL, "CH2"), > + LTC249X_CHAN(3, LTC249X_SGL, "CH3"), > + LTC249X_CHAN(4, LTC249X_SGL, "CH4"), > + LTC249X_CHAN(5, LTC249X_SGL, "CH5"), > + LTC249X_CHAN(6, LTC249X_SGL, "CH6"), > + LTC249X_CHAN(7, LTC249X_SGL, "CH7"), > + LTC249X_CHAN(8, LTC249X_SGL, "CH8"), > + LTC249X_CHAN(9, LTC249X_SGL, "CH9"), > + LTC249X_CHAN(10, LTC249X_SGL, "CH10"), > + LTC249X_CHAN(11, LTC249X_SGL, "CH11"), > + LTC249X_CHAN(12, LTC249X_SGL, "CH12"), > + LTC249X_CHAN(13, LTC249X_SGL, "CH13"), > + LTC249X_CHAN(14, LTC249X_SGL, "CH14"), > + LTC249X_CHAN(15, LTC249X_SGL, "CH15"), > + LTC249X_CHAN_DIFF(0, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(1, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(2, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(3, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(4, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(5, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(6, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(7, LTC249X_DIFF), > + LTC249X_CHAN_DIFF(0, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(1, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(2, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(3, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(4, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(5, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(6, LTC249X_DIFF | LTC249X_SIGN), > + LTC249X_CHAN_DIFF(7, LTC249X_DIFF | LTC249X_SIGN), > +}; > + > +static const struct iio_info ltc249x_info = { > + .read_raw = ltc249x_read_raw, > +}; > + > +int ltc249x_probe(struct device *dev, struct iio_dev *indio_dev) > +{ > + struct ltc249x_driverdata *ddata = iio_priv(indio_dev); > + int ret; > + > + indio_dev->dev.parent = dev; > + indio_dev->name = dev_name(dev); > + indio_dev->info = <c249x_info; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = ltc249x_channel; > + indio_dev->num_channels = ARRAY_SIZE(ltc249x_channel); > + > + ret = ddata->result_and_measure(ddata, LTC249X_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 = LTC249X_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(ltc249x_probe, LTC249X); > + > +void ltc249x_remove(struct iio_dev *indio_dev) > +{ > + struct ltc249x_driverdata *ddata = iio_priv(indio_dev); > + > + iio_device_unregister(indio_dev); > + > + iio_map_array_unregister(indio_dev); > + > + regulator_disable(ddata->ref); > +} > +EXPORT_SYMBOL_NS(ltc249x_remove, LTC249X); > + > +MODULE_DESCRIPTION("common code for LTC2496/LTC2497 drivers"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/iio/adc/ltc249x.h b/drivers/iio/adc/ltc249x.h > new file mode 100644 > index 000000000000..b272a3f96d03 > --- /dev/null > +++ b/drivers/iio/adc/ltc249x.h > @@ -0,0 +1,18 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > + > +#define LTC249X_ENABLE 0xA0 > +#define LTC249X_CONFIG_DEFAULT LTC249X_ENABLE > +#define LTC249X_CONVERSION_TIME_MS 150ULL > + > +struct ltc249x_driverdata { > + struct regulator *ref; > + ktime_t time_prev; > + u8 addr_prev; > + int (*result_and_measure)(struct ltc249x_driverdata *ddata, > + u8 address, int *val); > +}; > + > +int ltc249x_probe(struct device *dev, struct iio_dev *indio_dev); > +void ltc249x_remove(struct iio_dev *indio_dev); > + > +MODULE_IMPORT_NS(LTC249X);
