staging:iio: Move DAC drivers out of staging

The IIO DAC drivers are in a reasonably good shape. They all make use of channel
spec and non of them provides non-documented sysfs attributes. Code style should
be OK as well, both checkpatch and coccicheck only report trivial issues.

So lets move the whole folder out of staging.

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

drivers/iio/Kconfig

···
 source "drivers/iio/amplifiers/Kconfig"
 source "drivers/iio/light/Kconfig"
 source "drivers/iio/frequency/Kconfig"
+source "drivers/iio/dac/Kconfig"
 
 endif # IIO

drivers/iio/Makefile

···
 obj-y += amplifiers/
 obj-y += light/
 obj-y += frequency/
+obj-y += dac/

drivers/staging/iio/Kconfig

···
 source "drivers/staging/iio/adc/Kconfig"
 source "drivers/staging/iio/addac/Kconfig"
 source "drivers/staging/iio/cdc/Kconfig"
-source "drivers/staging/iio/dac/Kconfig"
 source "drivers/staging/iio/frequency/Kconfig"
 source "drivers/staging/iio/gyro/Kconfig"
 source "drivers/staging/iio/impedance-analyzer/Kconfig"

drivers/staging/iio/Makefile

···
 obj-y += adc/
 obj-y += addac/
 obj-y += cdc/
-obj-y += dac/
 obj-y += frequency/
 obj-y += gyro/
 obj-y += impedance-analyzer/

drivers/staging/iio/dac/ad5421.c drivers/iio/dac/ad5421.c

···
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
-#include "ad5421.h"
+#include <linux/iio/dac/ad5421.h>
 
 
 #define AD5421_REG_DAC_DATA		0x1

drivers/staging/iio/dac/ad5421.h include/linux/iio/dac/ad5421.h

···
 #ifndef __IIO_DAC_AD5421_H__
 #define __IIO_DAC_AD5421_H__
 
-/*
- * TODO: This file needs to go into include/linux/iio
- */
-
 /**
  * enum ad5421_current_range - Current range the AD5421 is configured for.
  * @AD5421_CURRENT_RANGE_4mA_20mA: 4 mA to 20 mA (RANGE1,0 pins = 00)

drivers/staging/iio/dac/ad5504.c drivers/iio/dac/ad5504.c

···
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
-
-#include "ad5504.h"
+#include <linux/iio/dac/ad5504.h>
 
 #define AD5505_BITS			12
 #define AD5504_RES_MASK			((1 << (AD5505_BITS)) - 1)

drivers/staging/iio/dac/ad5504.h include/linux/iio/dac/ad5504.h

···
 #ifndef SPI_AD5504_H_
 #define SPI_AD5504_H_
 
-/*
- * TODO: struct ad5504_platform_data needs to go into include/linux/iio
- */
-
 struct ad5504_platform_data {
 	u16				vref_mv;
 };

drivers/staging/iio/dac/ad5791.c drivers/iio/dac/ad5791.c

···
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
-
-#include "ad5791.h"
+#include <linux/iio/dac/ad5791.h>
 
 #define AD5791_RES_MASK(x)		((1 << (x)) - 1)
 #define AD5791_DAC_MASK			AD5791_RES_MASK(20)

drivers/staging/iio/dac/ad5791.h include/linux/iio/dac/ad5791.h

···
 #ifndef SPI_AD5791_H_
 #define SPI_AD5791_H_
 
-/*
- * TODO: struct ad5791_platform_data needs to go into include/linux/iio
- */
-
 /**
  * struct ad5791_platform_data - platform specific information
  * @vref_pos_mv:	Vdd Positive Analog Supply Volatge (mV)

drivers/staging/iio/dac/max517.c drivers/iio/dac/max517.c

···
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
-
-#include "max517.h"
+#include <linux/iio/dac/max517.h>
 
 #define MAX517_DRV_NAME	"max517"
 

drivers/staging/iio/dac/max517.h include/linux/iio/dac/max517.h

···
 #ifndef IIO_DAC_MAX517_H_
 #define IIO_DAC_MAX517_H_
 
-/*
- * TODO: struct max517_platform_data needs to go into include/linux/iio
- */
-
 struct max517_platform_data {
 	u16				vref_mv[2];
 };