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d3f770582a
Add system sleep power management support to st_lsm6dsx driver. In particular during suspend phase each sensor is disabled and hw fifo is configured in bypass in order to avoid subsequent I/O operations. The patch has been tested on HiKey board device Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/*
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* STMicroelectronics st_lsm6dsx sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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* Denis Ciocca <denis.ciocca@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#ifndef ST_LSM6DSX_H
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#define ST_LSM6DSX_H
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#include <linux/device.h>
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#define ST_LSM6DS3_DEV_NAME "lsm6ds3"
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#define ST_LSM6DS3H_DEV_NAME "lsm6ds3h"
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#define ST_LSM6DSL_DEV_NAME "lsm6dsl"
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#define ST_LSM6DSM_DEV_NAME "lsm6dsm"
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enum st_lsm6dsx_hw_id {
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ST_LSM6DS3_ID,
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ST_LSM6DS3H_ID,
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ST_LSM6DSL_ID,
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ST_LSM6DSM_ID,
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ST_LSM6DSX_MAX_ID,
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};
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#define ST_LSM6DSX_CHAN_SIZE 2
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#define ST_LSM6DSX_SAMPLE_SIZE 6
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#define ST_LSM6DSX_SAMPLE_DEPTH (ST_LSM6DSX_SAMPLE_SIZE / \
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ST_LSM6DSX_CHAN_SIZE)
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#if defined(CONFIG_SPI_MASTER)
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#define ST_LSM6DSX_RX_MAX_LENGTH 256
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#define ST_LSM6DSX_TX_MAX_LENGTH 8
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struct st_lsm6dsx_transfer_buffer {
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u8 rx_buf[ST_LSM6DSX_RX_MAX_LENGTH];
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u8 tx_buf[ST_LSM6DSX_TX_MAX_LENGTH] ____cacheline_aligned;
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};
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#endif /* CONFIG_SPI_MASTER */
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struct st_lsm6dsx_transfer_function {
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int (*read)(struct device *dev, u8 addr, int len, u8 *data);
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int (*write)(struct device *dev, u8 addr, int len, u8 *data);
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};
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struct st_lsm6dsx_reg {
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u8 addr;
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u8 mask;
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};
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struct st_lsm6dsx_settings {
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u8 wai;
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u16 max_fifo_size;
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enum st_lsm6dsx_hw_id id[ST_LSM6DSX_MAX_ID];
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};
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enum st_lsm6dsx_sensor_id {
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ST_LSM6DSX_ID_ACC,
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ST_LSM6DSX_ID_GYRO,
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ST_LSM6DSX_ID_MAX,
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};
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enum st_lsm6dsx_fifo_mode {
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ST_LSM6DSX_FIFO_BYPASS = 0x0,
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ST_LSM6DSX_FIFO_CONT = 0x6,
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};
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/**
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* struct st_lsm6dsx_sensor - ST IMU sensor instance
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* @name: Sensor name.
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* @id: Sensor identifier.
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* @hw: Pointer to instance of struct st_lsm6dsx_hw.
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* @gain: Configured sensor sensitivity.
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* @odr: Output data rate of the sensor [Hz].
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* @watermark: Sensor watermark level.
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* @sip: Number of samples in a given pattern.
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* @decimator: FIFO decimation factor.
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* @decimator_mask: Sensor mask for decimation register.
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* @delta_ts: Delta time between two consecutive interrupts.
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* @ts: Latest timestamp from the interrupt handler.
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*/
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struct st_lsm6dsx_sensor {
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char name[32];
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enum st_lsm6dsx_sensor_id id;
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struct st_lsm6dsx_hw *hw;
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u32 gain;
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u16 odr;
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u16 watermark;
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u8 sip;
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u8 decimator;
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u8 decimator_mask;
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s64 delta_ts;
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s64 ts;
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};
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/**
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* struct st_lsm6dsx_hw - ST IMU MEMS hw instance
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* @dev: Pointer to instance of struct device (I2C or SPI).
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* @irq: Device interrupt line (I2C or SPI).
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* @lock: Mutex to protect read and write operations.
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* @fifo_lock: Mutex to prevent concurrent access to the hw FIFO.
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* @fifo_mode: FIFO operating mode supported by the device.
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* @enable_mask: Enabled sensor bitmask.
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* @sip: Total number of samples (acc/gyro) in a given pattern.
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* @iio_devs: Pointers to acc/gyro iio_dev instances.
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* @settings: Pointer to the specific sensor settings in use.
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* @tf: Transfer function structure used by I/O operations.
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* @tb: Transfer buffers used by SPI I/O operations.
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*/
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struct st_lsm6dsx_hw {
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struct device *dev;
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int irq;
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struct mutex lock;
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struct mutex fifo_lock;
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enum st_lsm6dsx_fifo_mode fifo_mode;
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u8 enable_mask;
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u8 sip;
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struct iio_dev *iio_devs[ST_LSM6DSX_ID_MAX];
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const struct st_lsm6dsx_settings *settings;
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const struct st_lsm6dsx_transfer_function *tf;
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#if defined(CONFIG_SPI_MASTER)
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struct st_lsm6dsx_transfer_buffer tb;
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#endif /* CONFIG_SPI_MASTER */
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};
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extern const struct dev_pm_ops st_lsm6dsx_pm_ops;
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int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name,
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const struct st_lsm6dsx_transfer_function *tf_ops);
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int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor);
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int st_lsm6dsx_sensor_disable(struct st_lsm6dsx_sensor *sensor);
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int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw);
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int st_lsm6dsx_write_with_mask(struct st_lsm6dsx_hw *hw, u8 addr, u8 mask,
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u8 val);
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int st_lsm6dsx_update_watermark(struct st_lsm6dsx_sensor *sensor,
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u16 watermark);
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int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw);
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int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
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enum st_lsm6dsx_fifo_mode fifo_mode);
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#endif /* ST_LSM6DSX_H */
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