iio: gyro: Add itg3200

This patch adds support for the InvenSense itg3200.
The itg3200 is a three-axis gyro with 16-bit ADC and
I2C interface.

Signed-off-by: Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 154 insertions, 0 deletions

diff --git a/include/linux/iio/gyro/itg3200.h b/include/linux/iio/gyro/itg3200.h
new file mode 100644
index 0000000..c53f169
--- /dev/null
+++ b/include/linux/iio/gyro/itg3200.h
@@ -0,0 +1,154 @@
+/*
+ * itg3200.h -- support InvenSense ITG3200
+ *              Digital 3-Axis Gyroscope driver
+ *
+ * Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de>
+ * Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
+ * Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
+ *
+ * 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.
+ */
+
+#ifndef I2C_ITG3200_H_
+#define I2C_ITG3200_H_
+
+#include <linux/iio/iio.h>
+
+/* Register with I2C address (34h) */
+#define ITG3200_REG_ADDRESS		0x00
+
+/* Sample rate divider
+ * Range: 0 to 255
+ * Default value: 0x00 */
+#define ITG3200_REG_SAMPLE_RATE_DIV	0x15
+
+/* Digital low pass filter settings */
+#define ITG3200_REG_DLPF		0x16
+/* DLPF full scale range */
+#define ITG3200_DLPF_FS_SEL_2000	0x18
+/* Bandwidth (Hz) and internal sample rate
+ * (kHz) of DLPF */
+#define ITG3200_DLPF_256_8		0x00
+#define ITG3200_DLPF_188_1		0x01
+#define ITG3200_DLPF_98_1		0x02
+#define ITG3200_DLPF_42_1		0x03
+#define ITG3200_DLPF_20_1		0x04
+#define ITG3200_DLPF_10_1		0x05
+#define ITG3200_DLPF_5_1		0x06
+
+#define ITG3200_DLPF_CFG_MASK		0x07
+
+/* Configuration for interrupt operations */
+#define ITG3200_REG_IRQ_CONFIG		0x17
+/* Logic level */
+#define ITG3200_IRQ_ACTIVE_LOW		0x80
+#define ITG3200_IRQ_ACTIVE_HIGH		0x00
+/* Drive type */
+#define ITG3200_IRQ_OPEN_DRAIN		0x40
+#define ITG3200_IRQ_PUSH_PULL		0x00
+/* Latch mode */
+#define ITG3200_IRQ_LATCH_UNTIL_CLEARED	0x20
+#define ITG3200_IRQ_LATCH_50US_PULSE	0x00
+/* Latch clear method */
+#define ITG3200_IRQ_LATCH_CLEAR_ANY	0x10
+#define ITG3200_IRQ_LATCH_CLEAR_STATUS	0x00
+/* Enable interrupt when device is ready */
+#define ITG3200_IRQ_DEVICE_RDY_ENABLE	0x04
+/* Enable interrupt when data is available */
+#define ITG3200_IRQ_DATA_RDY_ENABLE	0x01
+
+/* Determine the status of ITG-3200 interrupts */
+#define ITG3200_REG_IRQ_STATUS		0x1A
+/* Status of 'device is ready'-interrupt */
+#define ITG3200_IRQ_DEVICE_RDY_STATUS	0x04
+/* Status of 'data is available'-interrupt */
+#define ITG3200_IRQ_DATA_RDY_STATUS	0x01
+
+/* Sensor registers */
+#define ITG3200_REG_TEMP_OUT_H		0x1B
+#define ITG3200_REG_TEMP_OUT_L		0x1C
+#define ITG3200_REG_GYRO_XOUT_H		0x1D
+#define ITG3200_REG_GYRO_XOUT_L		0x1E
+#define ITG3200_REG_GYRO_YOUT_H		0x1F
+#define ITG3200_REG_GYRO_YOUT_L		0x20
+#define ITG3200_REG_GYRO_ZOUT_H		0x21
+#define ITG3200_REG_GYRO_ZOUT_L		0x22
+
+/* Power management */
+#define ITG3200_REG_POWER_MANAGEMENT	0x3E
+/* Reset device and internal registers to the
+ * power-up-default settings */
+#define ITG3200_RESET			0x80
+/* Enable low power sleep mode */
+#define ITG3200_SLEEP			0x40
+/* Put according gyroscope in standby mode */
+#define ITG3200_STANDBY_GYRO_X		0x20
+#define ITG3200_STANDBY_GYRO_Y		0x10
+#define ITG3200_STANDBY_GYRO_Z		0x08
+/* Determine the device clock source */
+#define ITG3200_CLK_INTERNAL		0x00
+#define ITG3200_CLK_GYRO_X		0x01
+#define ITG3200_CLK_GYRO_Y		0x02
+#define ITG3200_CLK_GYRO_Z		0x03
+#define ITG3200_CLK_EXT_32K		0x04
+#define ITG3200_CLK_EXT_19M		0x05
+
+
+/**
+ * struct itg3200 - device instance specific data
+ * @i2c:    actual i2c_client
+ * @trig:   data ready trigger from itg3200 pin
+ **/
+struct itg3200 {
+	struct i2c_client	*i2c;
+	struct iio_trigger	*trig;
+};
+
+enum ITG3200_SCAN_INDEX {
+	ITG3200_SCAN_TEMP,
+	ITG3200_SCAN_GYRO_X,
+	ITG3200_SCAN_GYRO_Y,
+	ITG3200_SCAN_GYRO_Z,
+	ITG3200_SCAN_ELEMENTS,
+};
+
+int itg3200_write_reg_8(struct iio_dev *indio_dev,
+		u8 reg_address, u8 val);
+
+int itg3200_read_reg_8(struct iio_dev *indio_dev,
+		u8 reg_address, u8 *val);
+
+
+#ifdef CONFIG_IIO_BUFFER
+
+void itg3200_remove_trigger(struct iio_dev *indio_dev);
+int itg3200_probe_trigger(struct iio_dev *indio_dev);
+
+int itg3200_buffer_configure(struct iio_dev *indio_dev);
+void itg3200_buffer_unconfigure(struct iio_dev *indio_dev);
+
+#else /* CONFIG_IIO_BUFFER */
+
+static inline void itg3200_remove_trigger(struct iio_dev *indio_dev)
+{
+}
+
+static inline int itg3200_probe_trigger(struct iio_dev *indio_dev)
+{
+	return 0;
+}
+
+static inline int itg3200_buffer_configure(struct iio_dev *indio_dev)
+{
+	return 0;
+}
+
+static inline void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
+{
+}
+
+#endif  /* CONFIG_IIO_RING_BUFFER */
+
+#endif /* ITG3200_H_ */