iio:adc:ad7298: Use BIT() and GENMASK() macros

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/bitops.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/platform_data/ad7298.h>

#define AD7298_WRITE	(1 << 15) /* write to the control register */

#define AD7298_REPEAT	(1 << 14) /* repeated conversion enable */

#define AD7298_CH(x)	(1 << (13 - (x))) /* channel select */

#define AD7298_TSENSE	(1 << 5) /* temperature conversion enable */

#define AD7298_EXTREF	(1 << 2) /* external reference enable */

#define AD7298_TAVG	(1 << 1) /* temperature sensor averaging enable */

#define AD7298_PDD	(1 << 0) /* partial power down enable */

#define AD7298_WRITE	BIT(15) /* write to the control register */

#define AD7298_REPEAT	BIT(14) /* repeated conversion enable */

#define AD7298_CH(x)	BIT(13 - (x)) /* channel select */

#define AD7298_TSENSE	BIT(5) /* temperature conversion enable */

#define AD7298_EXTREF	BIT(2) /* external reference enable */

#define AD7298_TAVG	BIT(1) /* temperature sensor averaging enable */

#define AD7298_PDD	BIT(0) /* partial power down enable */

#define AD7298_MAX_CHAN		8

#define AD7298_BITS		12

#define AD7298_STORAGE_BITS	16

#define AD7298_INTREF_mV	2500

#define AD7298_CH_TEMP		9

#define RES_MASK(bits)	((1 << (bits)) - 1)

struct ad7298_state {

	struct spi_device		*spi;

	struct regulator		*reg;

			return ret;

		if (chan->address != AD7298_CH_TEMP)

			*val = ret & RES_MASK(AD7298_BITS);

			*val = ret & GENMASK(chan->scan_type.realbits - 1, 0);

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE: