staging:iio:adc:ad799x: Use new triggered buffer setup helper function

Use the new triggered buffer setup helper function to allocate and register
buffer and pollfunc.

Also as part of the conversion drop scan_timestamp being enabled by default,
since it is a left over of an earlier cleanup.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/adc/Kconfig

@@ -63,7 +63,7 @@ config AD799X_RING_BUFFER
 	bool "Analog Devices AD799x: use ring buffer"
 	depends on AD799X
 	select IIO_BUFFER
-	select IIO_KFIFO_BUF
+	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to include ring buffer support in the AD799X
 	  ADC driver.

drivers/staging/iio/adc/ad799x.h

@@ -120,8 +120,6 @@ struct ad799x_platform_data {
 	u16				vref_mv;
 };
 
-int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask);
-
 #ifdef CONFIG_AD799X_RING_BUFFER
 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
 void ad799x_ring_cleanup(struct iio_dev *indio_dev);

drivers/staging/iio/adc/ad799x_core.c

@@ -99,10 +99,21 @@ static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
 	return ret;
 }
 
-int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
+static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
+	const unsigned long *scan_mask)
 {
-	return ad799x_i2c_write16(st, AD7998_CONF_REG,
-		st->config | (mask << AD799X_CHANNEL_SHIFT));
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	switch (st->id) {
+	case ad7997:
+	case ad7998:
+		return ad799x_i2c_write16(st, AD7998_CONF_REG,
+			st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
+	default:
+		break;
+	}
+
+	return 0;
 }
 
 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
@@ -442,6 +453,7 @@ static const struct iio_info ad7993_4_7_8_info = {
 	.read_event_value = &ad799x_read_event_value,
 	.write_event_value = &ad799x_write_event_value,
 	.driver_module = THIS_MODULE,
+	.update_scan_mode = ad7997_8_update_scan_mode,
 };
 
 #define AD799X_EV_MASK (IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | \
@@ -887,12 +899,6 @@ static int __devinit ad799x_probe(struct i2c_client *client,
 	if (ret)
 		goto error_disable_reg;
 
-	ret = iio_buffer_register(indio_dev,
-				  indio_dev->channels,
-				  indio_dev->num_channels);
-	if (ret)
-		goto error_cleanup_ring;
-
 	if (client->irq > 0) {
 		ret = request_threaded_irq(client->irq,
 					   NULL,
@@ -934,7 +940,6 @@ static __devexit int ad799x_remove(struct i2c_client *client)
 	if (client->irq > 0)
 		free_irq(client->irq, indio_dev);
 
-	iio_buffer_unregister(indio_dev);
 	ad799x_ring_cleanup(indio_dev);
 	if (!IS_ERR(st->reg)) {
 		regulator_disable(st->reg);

drivers/staging/iio/adc/ad799x_ring.c

@@ -18,32 +18,11 @@
 
 #include <linux/iio/iio.h>
 #include <linux/iio/buffer.h>
-#include <linux/iio/kfifo_buf.h>
 #include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
 
 #include "ad799x.h"
 
-/**
- * ad799x_ring_preenable() setup the parameters of the ring before enabling
- *
- * The complex nature of the setting of the number of bytes per datum is due
- * to this driver currently ensuring that the timestamp is stored at an 8
- * byte boundary.
- **/
-static int ad799x_ring_preenable(struct iio_dev *indio_dev)
-{
-	struct ad799x_state *st = iio_priv(indio_dev);
-	/*
-	 * Need to figure out the current mode based upon the requested
-	 * scan mask in iio_dev
-	 */
-
-	if (st->id == ad7997 || st->id == ad7998)
-		ad7997_8_set_scan_mode(st, *indio_dev->active_scan_mask);
-
-	return iio_sw_buffer_preenable(indio_dev);
-}
-
 /**
  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
  *
@@ -110,49 +89,13 @@ static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 	return IRQ_HANDLED;
 }
 
-static const struct iio_buffer_setup_ops ad799x_buf_setup_ops = {
-	.preenable = &ad799x_ring_preenable,
-	.postenable = &iio_triggered_buffer_postenable,
-	.predisable = &iio_triggered_buffer_predisable,
-};
-
 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 {
-	int ret = 0;
-
-	indio_dev->buffer = iio_kfifo_allocate(indio_dev);
-	if (!indio_dev->buffer) {
-		ret = -ENOMEM;
-		goto error_ret;
-	}
-	indio_dev->pollfunc = iio_alloc_pollfunc(NULL,
-						 &ad799x_trigger_handler,
-						 IRQF_ONESHOT,
-						 indio_dev,
-						 "%s_consumer%d",
-						 indio_dev->name,
-						 indio_dev->id);
-	if (indio_dev->pollfunc == NULL) {
-		ret = -ENOMEM;
-		goto error_deallocate_kfifo;
-	}
-
-	/* Ring buffer functions - here trigger setup related */
-	indio_dev->setup_ops = &ad799x_buf_setup_ops;
-	indio_dev->buffer->scan_timestamp = true;
-
-	/* Flag that polled ring buffering is possible */
-	indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
-	return 0;
-
-error_deallocate_kfifo:
-	iio_kfifo_free(indio_dev->buffer);
-error_ret:
-	return ret;
+	return iio_triggered_buffer_setup(indio_dev, NULL,
+		&ad799x_trigger_handler, NULL);
 }
 
 void ad799x_ring_cleanup(struct iio_dev *indio_dev)
 {
-	iio_dealloc_pollfunc(indio_dev->pollfunc);
-	iio_kfifo_free(indio_dev->buffer);
+	iio_triggered_buffer_cleanup(indio_dev);
 }