1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad7298.h b/drivers/staging/iio/adc/ad7298.h
new file mode 100644
index 000000000000..fe7ed77d638f
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7298.h
@@ -0,0 +1,80 @@
+/*
+ * AD7298 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef IIO_ADC_AD7298_H_
+#define IIO_ADC_AD7298_H_
+
+#define AD7298_WRITE	(1 << 15) /* write to the control register */
+#define AD7298_REPEAT	(1 << 14) /* repeated conversion enable */
+#define AD7298_CH(x)	(1 << (13 - (x))) /* channel select */
+#define AD7298_TSENSE	(1 << 5) /* temperature conversion enable */
+#define AD7298_EXTREF	(1 << 2) /* external reference enable */
+#define AD7298_TAVG	(1 << 1) /* temperature sensor averaging enable */
+#define AD7298_PDD	(1 << 0) /* partial power down enable */
+
+#define AD7298_CH_MASK	(AD7298_CH0 | AD7298_CH1 | AD7298_CH2 | AD7298_CH3 | \
+			AD7298_CH4 | AD7298_CH5 | AD7298_CH6 | AD7298_CH7)
+
+#define AD7298_MAX_CHAN		8
+#define AD7298_BITS		12
+#define AD7298_STORAGE_BITS	16
+#define AD7298_INTREF_mV	2500
+
+#define RES_MASK(bits)	((1 << (bits)) - 1)
+
+/*
+ * TODO: struct ad7298_platform_data needs to go into include/linux/iio
+ */
+
+struct ad7298_platform_data {
+	/* External Vref voltage applied */
+	u16				vref_mv;
+};
+
+struct ad7298_state {
+	struct iio_dev			*indio_dev;
+	struct spi_device		*spi;
+	struct regulator		*reg;
+	struct work_struct		poll_work;
+	atomic_t			protect_ring;
+	size_t				d_size;
+	u16				int_vref_mv;
+	unsigned			ext_ref;
+	struct spi_transfer		ring_xfer[10];
+	struct spi_transfer		scan_single_xfer[3];
+	struct spi_message		ring_msg;
+	struct spi_message		scan_single_msg;
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	unsigned short			rx_buf[8] ____cacheline_aligned;
+	unsigned short			tx_buf[2];
+};
+
+#ifdef CONFIG_IIO_RING_BUFFER
+int ad7298_scan_from_ring(struct ad7298_state *st, long ch);
+int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+void ad7298_ring_cleanup(struct iio_dev *indio_dev);
+#else /* CONFIG_IIO_RING_BUFFER */
+static inline int ad7298_scan_from_ring(struct ad7298_state *st, long ch)
+{
+	return 0;
+}
+
+static inline int
+ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+	return 0;
+}
+
+static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev)
+{
+}
+#endif /* CONFIG_IIO_RING_BUFFER */
+#endif /* IIO_ADC_AD7298_H_ */