staging: iio: gyro: new driver for ADIS16130 digital output gyros

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/gyro/Kconfig

@@ -17,6 +17,13 @@ config ADIS16080
 	  Say yes here to build support for Analog Devices adis16080/100 Yaw Rate
 	  Gyroscope with SPI.
 
+config ADIS16130
+	tristate "Analog Devices ADIS16130 High Precision Angular Rate Sensor driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices ADIS16130 High Precision
+	  Angular Rate Sensor driver.
+
 config ADIS16260
 	tristate "Analog Devices ADIS16260 ADIS16265 Digital Gyroscope Sensor SPI driver"
 	depends on SPI

drivers/staging/iio/gyro/Makefile

@@ -8,6 +8,9 @@ obj-$(CONFIG_ADIS16060) += adis16060.o
 adis16080-y             := adis16080_core.o
 obj-$(CONFIG_ADIS16080) += adis16080.o
 
+adis16130-y             := adis16130_core.o
+obj-$(CONFIG_ADIS16130) += adis16130.o
+
 adis16260-y             := adis16260_core.o
 adis16260-$(CONFIG_IIO_RING_BUFFER) += adis16260_ring.o adis16260_trigger.o
 obj-$(CONFIG_ADIS16260) += adis16260.o

drivers/staging/iio/gyro/adis16130.h

@@ -0,0 +1,108 @@
+#ifndef SPI_ADIS16130_H_
+#define SPI_ADIS16130_H_
+
+#define ADIS16130_CON         0x0
+#define ADIS16130_CON_RD      (1 << 6)
+#define ADIS16130_IOP         0x1
+#define ADIS16130_IOP_ALL_RDY (1 << 3) /* 1 = data-ready signal low when unread data on all channels; */
+#define ADIS16130_IOP_SYNC    (1 << 0) /* 1 = synchronization enabled */
+#define ADIS16130_RATEDATA    0x8 /* Gyroscope output, rate of rotation */
+#define ADIS16130_TEMPDATA    0xA /* Temperature output */
+#define ADIS16130_RATECS      0x28 /* Gyroscope channel setup */
+#define ADIS16130_RATECS_EN   (1 << 3) /* 1 = channel enable; */
+#define ADIS16130_TEMPCS      0x2A /* Temperature channel setup */
+#define ADIS16130_TEMPCS_EN   (1 << 3)
+#define ADIS16130_RATECONV    0x30
+#define ADIS16130_TEMPCONV    0x32
+#define ADIS16130_MODE        0x38
+#define ADIS16130_MODE_24BIT  (1 << 1) /* 1 = 24-bit resolution; */
+
+#define ADIS16130_MAX_TX     4
+#define ADIS16130_MAX_RX     4
+
+/**
+ * struct adis16130_state - device instance specific data
+ * @us:			actual spi_device to write data
+ * @work_trigger_to_ring: bh for triggered event handling
+ * @inter:		used to check if new interrupt has been triggered
+ * @last_timestamp:	passing timestamp from th to bh of interrupt handler
+ * @indio_dev:		industrial I/O device structure
+ * @trig:		data ready trigger registered with iio
+ * @tx:			transmit buffer
+ * @rx:			recieve buffer
+ * @buf_lock:		mutex to protect tx and rx
+ **/
+struct adis16130_state {
+	struct spi_device		*us;
+	struct work_struct		work_trigger_to_ring;
+	s64				last_timestamp;
+	struct iio_dev			*indio_dev;
+	struct iio_trigger		*trig;
+	u8				*tx;
+	u8				*rx;
+	u32                             mode; /* 1: 24bits mode 0:16bits mode */
+	struct mutex			buf_lock;
+};
+
+#if defined(CONFIG_IIO_RING_BUFFER) && defined(THIS_HAS_RING_BUFFER_SUPPORT)
+/* At the moment triggers are only used for ring buffer
+ * filling. This may change!
+ */
+
+enum adis16130_scan {
+	ADIS16130_SCAN_GYRO,
+	ADIS16130_SCAN_TEMP,
+};
+
+void adis16130_remove_trigger(struct iio_dev *indio_dev);
+int adis16130_probe_trigger(struct iio_dev *indio_dev);
+
+ssize_t adis16130_read_data_from_ring(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf);
+
+
+int adis16130_configure_ring(struct iio_dev *indio_dev);
+void adis16130_unconfigure_ring(struct iio_dev *indio_dev);
+
+int adis16130_initialize_ring(struct iio_ring_buffer *ring);
+void adis16130_uninitialize_ring(struct iio_ring_buffer *ring);
+#else /* CONFIG_IIO_RING_BUFFER */
+
+static inline void adis16130_remove_trigger(struct iio_dev *indio_dev)
+{
+}
+
+static inline int adis16130_probe_trigger(struct iio_dev *indio_dev)
+{
+	return 0;
+}
+
+static inline ssize_t
+adis16130_read_data_from_ring(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	return 0;
+}
+
+static int adis16130_configure_ring(struct iio_dev *indio_dev)
+{
+	return 0;
+}
+
+static inline void adis16130_unconfigure_ring(struct iio_dev *indio_dev)
+{
+}
+
+static inline int adis16130_initialize_ring(struct iio_ring_buffer *ring)
+{
+	return 0;
+}
+
+static inline void adis16130_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+}
+
+#endif /* CONFIG_IIO_RING_BUFFER */
+#endif /* SPI_ADIS16130_H_ */