Merge branch 'master' into csb1725

[mv-sheeva.git] / drivers / staging / iio / adc / ad7476.h

diff --git a/drivers/staging/iio/adc/ad7476.h b/drivers/staging/iio/adc/ad7476.h
new file mode 100644 (file)
index 0000000..b51b49e
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7476.h
@@ -0,0 +1,77 @@
+/*
+ * AD7476/5/7/8 (A) SPI ADC driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+#ifndef IIO_ADC_AD7476_H_
+#define IIO_ADC_AD7476_H_
+
+#define RES_MASK(bits) ((1 << (bits)) - 1)
+
+/*
+ * TODO: struct ad7476_platform_data needs to go into include/linux/iio
+ */
+
+struct ad7476_platform_data {
+       u16                             vref_mv;
+};
+
+struct ad7476_chip_info {
+       u8                              bits;
+       u8                              storagebits;
+       u8                              res_shift;
+       char                            sign;
+       u16                             int_vref_mv;
+};
+
+struct ad7476_state {
+       struct iio_dev                  *indio_dev;
+       struct spi_device               *spi;
+       const struct ad7476_chip_info   *chip_info;
+       struct regulator                *reg;
+       struct work_struct              poll_work;
+       atomic_t                        protect_ring;
+       u16                             int_vref_mv;
+       struct spi_transfer             xfer;
+       struct spi_message              msg;
+       /*
+        * DMA (thus cache coherency maintenance) requires the
+        * transfer buffers to live in their own cache lines.
+        */
+       unsigned char                   data[2] ____cacheline_aligned;
+};
+
+enum ad7476_supported_device_ids {
+       ID_AD7466,
+       ID_AD7467,
+       ID_AD7468,
+       ID_AD7475,
+       ID_AD7476,
+       ID_AD7477,
+       ID_AD7478,
+       ID_AD7495
+};
+
+#ifdef CONFIG_IIO_RING_BUFFER
+int ad7476_scan_from_ring(struct ad7476_state *st);
+int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+void ad7476_ring_cleanup(struct iio_dev *indio_dev);
+#else /* CONFIG_IIO_RING_BUFFER */
+static inline int ad7476_scan_from_ring(struct ad7476_state *st)
+{
+       return 0;
+}
+
+static inline int
+ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+       return 0;
+}
+
+static inline void ad7476_ring_cleanup(struct iio_dev *indio_dev)
+{
+}
+#endif /* CONFIG_IIO_RING_BUFFER */
+#endif /* IIO_ADC_AD7476_H_ */