staging:iio:ad7291: Move out of staging

The ad7291 driver is in a reasonable shape. It does not use non-standard API/ABI
and there are no major style issues with the driver. So this patch moves it out
of staging.

There is one small warning from checkpatch which is also fixed in this patch.
The patch also sorts the #include directives in alphabetical order.

Signed-off-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/Kconfig

···
 	  Say yes here to build support for Analog Devices AD7265 and AD7266
 	  ADCs.
 
+config AD7291
+	tristate "Analog Devices AD7291 ADC driver"
+	depends on I2C
+	help
+	  Say yes here to build support for Analog Devices AD7291
+	  8 Channel ADC with temperature sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad7291.
+
 config AD7298
 	tristate "Analog Devices AD7298 ADC driver"
 	depends on SPI

drivers/iio/adc/Makefile

···
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
 obj-$(CONFIG_AD7266) += ad7266.o
+obj-$(CONFIG_AD7291) += ad7291.o
 obj-$(CONFIG_AD7298) += ad7298.o
 obj-$(CONFIG_AD7923) += ad7923.o
 obj-$(CONFIG_AD7476) += ad7476.o

drivers/staging/iio/adc/Kconfig

···
 #
 menu "Analog to digital converters"
 
-config AD7291
-	tristate "Analog Devices AD7291 ADC driver"
-	depends on I2C
-	help
-	  Say yes here to build support for Analog Devices AD7291
-	  8 Channel ADC with temperature sensor.
-
 config AD7606
 	tristate "Analog Devices AD7606 ADC driver"
 	depends on GPIOLIB

drivers/staging/iio/adc/Makefile

···
 ad7606-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
 obj-$(CONFIG_AD7606) += ad7606.o
 
-obj-$(CONFIG_AD7291) += ad7291.o
 obj-$(CONFIG_AD7780) += ad7780.o
 obj-$(CONFIG_AD7816) += ad7816.o
 obj-$(CONFIG_AD7192) += ad7192.o

drivers/staging/iio/adc/ad7291.c drivers/iio/adc/ad7291.c

···
  * Licensed under the GPL-2 or later.
  */
 
-#include <linux/interrupt.h>
 #include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
+#include <linux/err.h>
 #include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/regulator/consumer.h>
-#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
 
-#include "ad7291.h"
+#include <linux/platform_data/ad7291.h>
 
 /*
  * Simplified handling
···
 		case IIO_VOLTAGE:
 			if (chip->reg) {
 				int vref;
+
 				vref = regulator_get_voltage(chip->reg);
 				if (vref < 0)
 					return vref;