1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c
new file mode 100644
index 00000000..c2ebae12
--- /dev/null
+++ b/drivers/staging/iio/adc/ad799x_ring.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2010-2012 Michael Hennerich, Analog Devices Inc.
+ * Copyright (C) 2008-2010 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * ad799x_ring.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/bitops.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include "ad799x.h"
+
+/**
+ * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ **/
+
+static irqreturn_t ad799x_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad799x_state *st = iio_priv(indio_dev);
+	s64 time_ns;
+	int b_sent;
+	u8 cmd;
+
+	switch (st->id) {
+	case ad7991:
+	case ad7995:
+	case ad7999:
+		cmd = st->config |
+			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
+		break;
+	case ad7992:
+	case ad7993:
+	case ad7994:
+		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
+			AD7998_CONV_RES_REG;
+		break;
+	case ad7997:
+	case ad7998:
+		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
+		break;
+	default:
+		cmd = 0;
+	}
+
+	b_sent = i2c_smbus_read_i2c_block_data(st->client,
+			cmd, st->transfer_size, st->rx_buf);
+	if (b_sent < 0)
+		goto out;
+
+	time_ns = iio_get_time_ns();
+
+	if (indio_dev->scan_timestamp)
+		memcpy(st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
+			&time_ns, sizeof(time_ns));
+
+	iio_push_to_buffers(indio_dev, st->rx_buf);
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+	return iio_triggered_buffer_setup(indio_dev, NULL,
+		&ad799x_trigger_handler, NULL);
+}
+
+void ad799x_ring_cleanup(struct iio_dev *indio_dev)
+{
+	iio_triggered_buffer_cleanup(indio_dev);
+}