diff options
Diffstat (limited to 'drivers/staging/iio/accel/lis3l02dq.h')
| -rw-r--r-- | drivers/staging/iio/accel/lis3l02dq.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/staging/iio/accel/lis3l02dq.h b/drivers/staging/iio/accel/lis3l02dq.h new file mode 100644 index 000000000000..91a5375408c2 --- /dev/null +++ b/drivers/staging/iio/accel/lis3l02dq.h @@ -0,0 +1,232 @@ +/* + * LISL02DQ.h -- support STMicroelectronics LISD02DQ + * 3d 2g Linear Accelerometers via SPI + * + * Copyright (c) 2007 Jonathan Cameron <jic23@cam.ac.uk> + * + * Loosely based upon tle62x0.c + * + * 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 SPI_LIS3L02DQ_H_ +#define SPI_LIS3L02DQ_H_ +#define LIS3L02DQ_READ_REG(a) ((a) | 0x80) +#define LIS3L02DQ_WRITE_REG(a) a + +/* Calibration parameters */ +#define LIS3L02DQ_REG_OFFSET_X_ADDR 0x16 +#define LIS3L02DQ_REG_OFFSET_Y_ADDR 0x17 +#define LIS3L02DQ_REG_OFFSET_Z_ADDR 0x18 + +#define LIS3L02DQ_REG_GAIN_X_ADDR 0x19 +#define LIS3L02DQ_REG_GAIN_Y_ADDR 0x1A +#define LIS3L02DQ_REG_GAIN_Z_ADDR 0x1B + +/* Control Register (1 of 2) */ +#define LIS3L02DQ_REG_CTRL_1_ADDR 0x20 +/* Power ctrl - either bit set corresponds to on*/ +#define LIS3L02DQ_REG_CTRL_1_PD_ON 0xC0 + +/* Decimation Factor */ +#define LIS3L02DQ_DEC_MASK 0x30 +#define LIS3L02DQ_REG_CTRL_1_DF_128 0x00 +#define LIS3L02DQ_REG_CTRL_1_DF_64 0x10 +#define LIS3L02DQ_REG_CTRL_1_DF_32 0x20 +#define LIS3L02DQ_REG_CTRL_1_DF_8 (0x10 | 0x20) + +/* Self Test Enable */ +#define LIS3L02DQ_REG_CTRL_1_SELF_TEST_ON 0x08 + +/* Axes enable ctrls */ +#define LIS3L02DQ_REG_CTRL_1_AXES_Z_ENABLE 0x04 +#define LIS3L02DQ_REG_CTRL_1_AXES_Y_ENABLE 0x02 +#define LIS3L02DQ_REG_CTRL_1_AXES_X_ENABLE 0x01 + +/* Control Register (2 of 2) */ +#define LIS3L02DQ_REG_CTRL_2_ADDR 0x21 + +/* Block Data Update only after MSB and LSB read */ +#define LIS3L02DQ_REG_CTRL_2_BLOCK_UPDATE 0x40 + +/* Set to big endian output */ +#define LIS3L02DQ_REG_CTRL_2_BIG_ENDIAN 0x20 + +/* Reboot memory content */ +#define LIS3L02DQ_REG_CTRL_2_REBOOT_MEMORY 0x10 + +/* Interupt Enable - applies data ready to the RDY pad */ +#define LIS3L02DQ_REG_CTRL_2_ENABLE_INTERRUPT 0x08 + +/* Enable Data Ready Generation - relationship with previous unclear in docs */ +#define LIS3L02DQ_REG_CTRL_2_ENABLE_DATA_READY_GENERATION 0x04 + +/* SPI 3 wire mode */ +#define LIS3L02DQ_REG_CTRL_2_THREE_WIRE_SPI_MODE 0x02 + +/* Data alignment, default is 12 bit right justified + * - option for 16 bit left justified */ +#define LIS3L02DQ_REG_CTRL_2_DATA_ALIGNMENT_16_BIT_LEFT_JUSTIFIED 0x01 + +/* Interupt related stuff */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_ADDR 0x23 + +/* Switch from or combination fo conditions to and */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_BOOLEAN_AND 0x80 + +/* Latch interupt request, + * if on ack must be given by reading the ack register */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_LATCH_SRC 0x40 + +/* Z Interupt on High (above threshold)*/ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_HIGH 0x20 +/* Z Interupt on Low */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_LOW 0x10 +/* Y Interupt on High */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_HIGH 0x08 +/* Y Interupt on Low */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_LOW 0x04 +/* X Interupt on High */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_HIGH 0x02 +/* X Interupt on Low */ +#define LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_LOW 0x01 + +/* Register that gives description of what caused interupt + * - latched if set in CFG_ADDRES */ +#define LIS3L02DQ_REG_WAKE_UP_SRC_ADDR 0x24 +/* top bit ignored */ +/* Interupt Active */ +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_ACTIVATED 0x40 +/* Interupts that have been triggered */ +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_HIGH 0x20 +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_LOW 0x10 +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_HIGH 0x08 +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_LOW 0x04 +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_HIGH 0x02 +#define LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_LOW 0x01 + +#define LIS3L02DQ_REG_WAKE_UP_ACK_ADDR 0x25 + +/* Status register */ +#define LIS3L02DQ_REG_STATUS_ADDR 0x27 +/* XYZ axis data overrun - first is all overrun? */ +#define LIS3L02DQ_REG_STATUS_XYZ_OVERRUN 0x80 +#define LIS3L02DQ_REG_STATUS_Z_OVERRUN 0x40 +#define LIS3L02DQ_REG_STATUS_Y_OVERRUN 0x20 +#define LIS3L02DQ_REG_STATUS_X_OVERRUN 0x10 +/* XYZ new data available - first is all 3 available? */ +#define LIS3L02DQ_REG_STATUS_XYZ_NEW_DATA 0x08 +#define LIS3L02DQ_REG_STATUS_Z_NEW_DATA 0x04 +#define LIS3L02DQ_REG_STATUS_Y_NEW_DATA 0x02 +#define LIS3L02DQ_REG_STATUS_X_NEW_DATA 0x01 + +/* The accelerometer readings - low and high bytes. +Form of high byte dependant on justification set in ctrl reg */ +#define LIS3L02DQ_REG_OUT_X_L_ADDR 0x28 +#define LIS3L02DQ_REG_OUT_X_H_ADDR 0x29 +#define LIS3L02DQ_REG_OUT_Y_L_ADDR 0x2A +#define LIS3L02DQ_REG_OUT_Y_H_ADDR 0x2B +#define LIS3L02DQ_REG_OUT_Z_L_ADDR 0x2C +#define LIS3L02DQ_REG_OUT_Z_H_ADDR 0x2D + +/* Threshold values for all axes and both above and below thresholds + * - i.e. there is only one value */ +#define LIS3L02DQ_REG_THS_L_ADDR 0x2E +#define LIS3L02DQ_REG_THS_H_ADDR 0x2F + +#define LIS3L02DQ_DEFAULT_CTRL1 (LIS3L02DQ_REG_CTRL_1_PD_ON \ + | LIS3L02DQ_REG_CTRL_1_AXES_Z_ENABLE \ + | LIS3L02DQ_REG_CTRL_1_AXES_Y_ENABLE \ + | LIS3L02DQ_REG_CTRL_1_AXES_X_ENABLE \ + | LIS3L02DQ_REG_CTRL_1_DF_128) + +#define LIS3L02DQ_DEFAULT_CTRL2 0 + +#define LIS3L02DQ_MAX_TX 12 +#define LIS3L02DQ_MAX_RX 12 +/** + * struct lis3l02dq_state - device instance specific data + * @us: actual spi_device + * @work_trigger_to_ring: bh for triggered event handling + * @work_cont_thresh: CLEAN + * @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 lis3l02dq_state { + struct spi_device *us; + struct work_struct work_trigger_to_ring; + struct iio_work_cont work_cont_thresh; + bool inter; + s64 last_timestamp; + struct iio_dev *indio_dev; + struct iio_trigger *trig; + u8 *tx; + u8 *rx; + struct mutex buf_lock; +}; + +int lis3l02dq_spi_read_reg_8(struct device *dev, + u8 reg_address, + u8 *val); + +int lis3l02dq_spi_write_reg_8(struct device *dev, + u8 reg_address, + u8 *val); +#define LIS3L02DQ_SCAN_ACC_X 0 +#define LIS3L02DQ_SCAN_ACC_Y 1 +#define LIS3L02DQ_SCAN_ACC_Z 2 + + +#ifdef CONFIG_IIO_RING_BUFFER +/* At the moment triggers are only used for ring buffer + * filling. This may change! + */ +void lis3l02dq_remove_trigger(struct iio_dev *indio_dev); +int lis3l02dq_probe_trigger(struct iio_dev *indio_dev); + +ssize_t lis3l02dq_read_accel_from_ring(struct device *dev, + struct device_attribute *attr, + char *buf); + + +int lis3l02dq_configure_ring(struct iio_dev *indio_dev); +void lis3l02dq_unconfigure_ring(struct iio_dev *indio_dev); + +int lis3l02dq_initialize_ring(struct iio_ring_buffer *ring); +void lis3l02dq_uninitialize_ring(struct iio_ring_buffer *ring); +#else /* CONFIG_IIO_RING_BUFFER */ + +static inline void lis3l02dq_remove_trigger(struct iio_dev *indio_dev) {}; +static inline int lis3l02dq_probe_trigger(struct iio_dev *indio_dev) +{ + return 0; +}; + +static inline ssize_t +lis3l02dq_read_accel_from_ring(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return 0; +}; + +static int lis3l02dq_configure_ring(struct iio_dev *indio_dev) +{ + return 0; +}; +static inline void lis3l02dq_unconfigure_ring(struct iio_dev *indio_dev) +{}; +static inline int lis3l02dq_initialize_ring(struct iio_ring_buffer *ring) +{ + return 0; +}; +static inline void lis3l02dq_uninitialize_ring(struct iio_ring_buffer *ring) {}; +#endif /* CONFIG_IIO_RING_BUFFER */ +#endif /* SPI_LIS3L02DQ_H_ */ |