staging:iio:accel:lis3l02dq remove sw_ring support.

The sw_ring buffer is being removed in favour of the kfifo version.
This is one of only a couple of driver still supporting its use.

This driver will hopefully also be removed in favour of supporting the
part in the unified ST accelerometer driver.

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

drivers/staging/iio/accel/Kconfig

···
 	tristate "ST Microelectronics LIS3L02DQ Accelerometer Driver"
 	depends on SPI
 	select IIO_TRIGGER if IIO_BUFFER
-	depends on !IIO_BUFFER || IIO_KFIFO_BUF || IIO_SW_RING
+	depends on !IIO_BUFFER || IIO_KFIFO_BUF
 	depends on GENERIC_GPIO
 	help
 	  Say yes here to build SPI support for the ST microelectronics
 	  accelerometer. The driver supplies direct access via sysfs files
 	  and an event interface via a character device.
-
-choice
-	prompt "Buffer type"
-       	depends on LIS3L02DQ && IIO_BUFFER
-
-config LIS3L02DQ_BUF_KFIFO
-       depends on IIO_KFIFO_BUF
-       bool "Simple FIFO"
-       help
-         Kfifo based FIFO.  Does not provide any events so it is up
-	 to userspace to ensure it reads often enough that data is not
-	 lost.
-
-config LIS3L02DQ_BUF_RING_SW
-       depends on IIO_SW_RING
-       bool "IIO Software Ring"
-       help
-         Original IIO ring buffer implementation.  Provides simple
-	 buffer events, half full etc.
-
-endchoice
 
 config SCA3000
 	depends on IIO_BUFFER

drivers/staging/iio/accel/lis3l02dq.h

···
 int lis3l02dq_configure_buffer(struct iio_dev *indio_dev);
 void lis3l02dq_unconfigure_buffer(struct iio_dev *indio_dev);
 
-#ifdef CONFIG_LIS3L02DQ_BUF_RING_SW
-#define lis3l02dq_free_buf iio_sw_rb_free
-#define lis3l02dq_alloc_buf iio_sw_rb_allocate
-#endif
-#ifdef CONFIG_LIS3L02DQ_BUF_KFIFO
-#define lis3l02dq_free_buf iio_kfifo_free
-#define lis3l02dq_alloc_buf iio_kfifo_allocate
-#endif
 irqreturn_t lis3l02dq_data_rdy_trig_poll(int irq, void *private);
 #define lis3l02dq_th lis3l02dq_data_rdy_trig_poll
 

drivers/staging/iio/accel/lis3l02dq_ring.c

···
 #include <linux/export.h>
 
 #include <linux/iio/iio.h>
-#include "../ring_sw.h"
 #include <linux/iio/kfifo_buf.h>
 #include <linux/iio/trigger.h>
 #include <linux/iio/trigger_consumer.h>
···
 void lis3l02dq_unconfigure_buffer(struct iio_dev *indio_dev)
 {
 	iio_dealloc_pollfunc(indio_dev->pollfunc);
-	lis3l02dq_free_buf(indio_dev->buffer);
+	iio_kfifo_free(indio_dev->buffer);
 }
 
 static int lis3l02dq_buffer_postenable(struct iio_dev *indio_dev)
···
 	int ret;
 	struct iio_buffer *buffer;
 
-	buffer = lis3l02dq_alloc_buf(indio_dev);
+	buffer = iio_kfifo_allocate(indio_dev);
 	if (!buffer)
 		return -ENOMEM;
 
···
 	return 0;
 
 error_iio_sw_rb_free:
-	lis3l02dq_free_buf(indio_dev->buffer);
+	iio_kfifo_free(indio_dev->buffer);
 	return ret;
 }