iio:adc:ad5791: Use BIT() and GENMASK() macros

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/dac/ad5791.c

@@ -16,17 +16,16 @@
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
+#include <linux/bitops.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/dac/ad5791.h>
 
-#define AD5791_RES_MASK(x)		((1 << (x)) - 1)
-#define AD5791_DAC_MASK			AD5791_RES_MASK(20)
-#define AD5791_DAC_MSB			(1 << 19)
+#define AD5791_DAC_MASK			GENMASK(19, 0)
 
-#define AD5791_CMD_READ			(1 << 23)
-#define AD5791_CMD_WRITE		(0 << 23)
+#define AD5791_CMD_READ			BIT(23)
+#define AD5791_CMD_WRITE		0
 #define AD5791_ADDR(addr)		((addr) << 20)
 
 /* Registers */
@@ -37,11 +36,11 @@
 #define AD5791_ADDR_SW_CTRL		4
 
 /* Control Register */
-#define AD5791_CTRL_RBUF		(1 << 1)
-#define AD5791_CTRL_OPGND		(1 << 2)
-#define AD5791_CTRL_DACTRI		(1 << 3)
-#define AD5791_CTRL_BIN2SC		(1 << 4)
-#define AD5791_CTRL_SDODIS		(1 << 5)
+#define AD5791_CTRL_RBUF		BIT(1)
+#define AD5791_CTRL_OPGND		BIT(2)
+#define AD5791_CTRL_DACTRI		BIT(3)
+#define AD5791_CTRL_BIN2SC		BIT(4)
+#define AD5791_CTRL_SDODIS		BIT(5)
 #define AD5761_CTRL_LINCOMP(x)		((x) << 6)
 
 #define AD5791_LINCOMP_0_10		0
@@ -54,9 +53,9 @@
 #define AD5780_LINCOMP_10_20		12
 
 /* Software Control Register */
-#define AD5791_SWCTRL_LDAC		(1 << 0)
-#define AD5791_SWCTRL_CLR		(1 << 1)
-#define AD5791_SWCTRL_RESET		(1 << 2)
+#define AD5791_SWCTRL_LDAC		BIT(0)
+#define AD5791_SWCTRL_CLR		BIT(1)
+#define AD5791_SWCTRL_RESET		BIT(2)
 
 #define AD5791_DAC_PWRDN_6K		0
 #define AD5791_DAC_PWRDN_3STATE		1
@@ -72,7 +71,7 @@ struct ad5791_chip_info {
 
 /**
  * struct ad5791_state - driver instance specific data
- * @us:			spi_device
+ * @spi:			spi_device
  * @reg_vdd:		positive supply regulator
  * @reg_vss:		negative supply regulator
  * @chip_info:		chip model specific constants
@@ -328,7 +327,7 @@ static int ad5791_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		val &= AD5791_RES_MASK(chan->scan_type.realbits);
+		val &= GENMASK(chan->scan_type.realbits - 1, 0);
 		val <<= chan->scan_type.shift;
 
 		return ad5791_spi_write(st, chan->address, val);