360 lines
10 KiB
C
360 lines
10 KiB
C
/*
|
|
* STMicroelectronics sensors library driver
|
|
*
|
|
* Copyright 2012-2013 STMicroelectronics Inc.
|
|
*
|
|
* Denis Ciocca <denis.ciocca@st.com>
|
|
*
|
|
* Licensed under the GPL-2.
|
|
*/
|
|
|
|
#ifndef ST_SENSORS_H
|
|
#define ST_SENSORS_H
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/irqreturn.h>
|
|
#include <linux/iio/trigger.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
#include <linux/platform_data/st_sensors_pdata.h>
|
|
|
|
#define ST_SENSORS_TX_MAX_LENGTH 2
|
|
#define ST_SENSORS_RX_MAX_LENGTH 6
|
|
|
|
#define ST_SENSORS_ODR_LIST_MAX 10
|
|
#define ST_SENSORS_FULLSCALE_AVL_MAX 10
|
|
|
|
#define ST_SENSORS_NUMBER_ALL_CHANNELS 4
|
|
#define ST_SENSORS_ENABLE_ALL_AXIS 0x07
|
|
#define ST_SENSORS_SCAN_X 0
|
|
#define ST_SENSORS_SCAN_Y 1
|
|
#define ST_SENSORS_SCAN_Z 2
|
|
#define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
|
|
#define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
|
|
#define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
|
|
#define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
|
|
#define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
|
|
#define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
|
|
#define ST_SENSORS_DEFAULT_STAT_ADDR 0x27
|
|
|
|
#define ST_SENSORS_MAX_NAME 17
|
|
#define ST_SENSORS_MAX_4WAI 8
|
|
|
|
#define ST_SENSORS_LSM_CHANNELS(device_type, mask, index, mod, \
|
|
ch2, s, endian, rbits, sbits, addr) \
|
|
{ \
|
|
.type = device_type, \
|
|
.modified = mod, \
|
|
.info_mask_separate = mask, \
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
|
|
.scan_index = index, \
|
|
.channel2 = ch2, \
|
|
.address = addr, \
|
|
.scan_type = { \
|
|
.sign = s, \
|
|
.realbits = rbits, \
|
|
.shift = sbits - rbits, \
|
|
.storagebits = sbits, \
|
|
.endianness = endian, \
|
|
}, \
|
|
}
|
|
|
|
#define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
|
|
IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
|
|
st_sensors_sysfs_sampling_frequency_avail)
|
|
|
|
#define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
|
|
IIO_DEVICE_ATTR(name, S_IRUGO, \
|
|
st_sensors_sysfs_scale_avail, NULL , 0);
|
|
|
|
struct st_sensor_odr_avl {
|
|
unsigned int hz;
|
|
u8 value;
|
|
};
|
|
|
|
struct st_sensor_odr {
|
|
u8 addr;
|
|
u8 mask;
|
|
struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
|
|
};
|
|
|
|
struct st_sensor_power {
|
|
u8 addr;
|
|
u8 mask;
|
|
u8 value_off;
|
|
u8 value_on;
|
|
};
|
|
|
|
struct st_sensor_axis {
|
|
u8 addr;
|
|
u8 mask;
|
|
};
|
|
|
|
struct st_sensor_fullscale_avl {
|
|
unsigned int num;
|
|
u8 value;
|
|
unsigned int gain;
|
|
unsigned int gain2;
|
|
};
|
|
|
|
struct st_sensor_fullscale {
|
|
u8 addr;
|
|
u8 mask;
|
|
struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
|
|
};
|
|
|
|
struct st_sensor_sim {
|
|
u8 addr;
|
|
u8 value;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_bdu - ST sensor device block data update
|
|
* @addr: address of the register.
|
|
* @mask: mask to write the block data update flag.
|
|
*/
|
|
struct st_sensor_bdu {
|
|
u8 addr;
|
|
u8 mask;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_das - ST sensor device data alignment selection
|
|
* @addr: address of the register.
|
|
* @mask: mask to write the das flag for left alignment.
|
|
*/
|
|
struct st_sensor_das {
|
|
u8 addr;
|
|
u8 mask;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_int_drdy - ST sensor device drdy line parameters
|
|
* @addr: address of INT drdy register.
|
|
* @mask: mask to enable drdy line.
|
|
* @addr_od: address to enable/disable Open Drain on the INT line.
|
|
* @mask_od: mask to enable/disable Open Drain on the INT line.
|
|
*/
|
|
struct st_sensor_int_drdy {
|
|
u8 addr;
|
|
u8 mask;
|
|
u8 addr_od;
|
|
u8 mask_od;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
|
|
* struct int1 - data-ready configuration register for INT1 pin.
|
|
* struct int2 - data-ready configuration register for INT2 pin.
|
|
* @addr_ihl: address to enable/disable active low on the INT lines.
|
|
* @mask_ihl: mask to enable/disable active low on the INT lines.
|
|
* struct stat_drdy - status register of DRDY (data ready) interrupt.
|
|
* struct ig1 - represents the Interrupt Generator 1 of sensors.
|
|
* @en_addr: address of the enable ig1 register.
|
|
* @en_mask: mask to write the on/off value for enable.
|
|
*/
|
|
struct st_sensor_data_ready_irq {
|
|
struct st_sensor_int_drdy int1;
|
|
struct st_sensor_int_drdy int2;
|
|
u8 addr_ihl;
|
|
u8 mask_ihl;
|
|
struct {
|
|
u8 addr;
|
|
u8 mask;
|
|
} stat_drdy;
|
|
struct {
|
|
u8 en_addr;
|
|
u8 en_mask;
|
|
} ig1;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_transfer_buffer - ST sensor device I/O buffer
|
|
* @buf_lock: Mutex to protect rx and tx buffers.
|
|
* @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
|
|
* This buffer is used to avoid DMA not-aligned issue.
|
|
* @rx_buf: Buffer used by SPI transfer to receive data from sensors.
|
|
* This buffer is used to avoid DMA not-aligned issue.
|
|
*/
|
|
struct st_sensor_transfer_buffer {
|
|
struct mutex buf_lock;
|
|
u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
|
|
u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_transfer_function - ST sensor device I/O function
|
|
* @read_byte: Function used to read one byte.
|
|
* @write_byte: Function used to write one byte.
|
|
* @read_multiple_byte: Function used to read multiple byte.
|
|
*/
|
|
struct st_sensor_transfer_function {
|
|
int (*read_byte) (struct st_sensor_transfer_buffer *tb,
|
|
struct device *dev, u8 reg_addr, u8 *res_byte);
|
|
int (*write_byte) (struct st_sensor_transfer_buffer *tb,
|
|
struct device *dev, u8 reg_addr, u8 data);
|
|
int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
|
|
struct device *dev, u8 reg_addr, int len, u8 *data,
|
|
bool multiread_bit);
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_settings - ST specific sensor settings
|
|
* @wai: Contents of WhoAmI register.
|
|
* @wai_addr: The address of WhoAmI register.
|
|
* @sensors_supported: List of supported sensors by struct itself.
|
|
* @ch: IIO channels for the sensor.
|
|
* @odr: Output data rate register and ODR list available.
|
|
* @pw: Power register of the sensor.
|
|
* @enable_axis: Enable one or more axis of the sensor.
|
|
* @fs: Full scale register and full scale list available.
|
|
* @bdu: Block data update register.
|
|
* @das: Data Alignment Selection register.
|
|
* @drdy_irq: Data ready register of the sensor.
|
|
* @sim: SPI serial interface mode register of the sensor.
|
|
* @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
|
|
* @bootime: samples to discard when sensor passing from power-down to power-up.
|
|
*/
|
|
struct st_sensor_settings {
|
|
u8 wai;
|
|
u8 wai_addr;
|
|
char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
|
|
struct iio_chan_spec *ch;
|
|
int num_ch;
|
|
struct st_sensor_odr odr;
|
|
struct st_sensor_power pw;
|
|
struct st_sensor_axis enable_axis;
|
|
struct st_sensor_fullscale fs;
|
|
struct st_sensor_bdu bdu;
|
|
struct st_sensor_das das;
|
|
struct st_sensor_data_ready_irq drdy_irq;
|
|
struct st_sensor_sim sim;
|
|
bool multi_read_bit;
|
|
unsigned int bootime;
|
|
};
|
|
|
|
/**
|
|
* struct st_sensor_data - ST sensor device status
|
|
* @dev: Pointer to instance of struct device (I2C or SPI).
|
|
* @trig: The trigger in use by the core driver.
|
|
* @sensor_settings: Pointer to the specific sensor settings in use.
|
|
* @current_fullscale: Maximum range of measure by the sensor.
|
|
* @vdd: Pointer to sensor's Vdd power supply
|
|
* @vdd_io: Pointer to sensor's Vdd-IO power supply
|
|
* @enabled: Status of the sensor (false->off, true->on).
|
|
* @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
|
|
* @buffer_data: Data used by buffer part.
|
|
* @odr: Output data rate of the sensor [Hz].
|
|
* num_data_channels: Number of data channels used in buffer.
|
|
* @drdy_int_pin: Redirect DRDY on pin 1 (1) or pin 2 (2).
|
|
* @int_pin_open_drain: Set the interrupt/DRDY to open drain.
|
|
* @get_irq_data_ready: Function to get the IRQ used for data ready signal.
|
|
* @tf: Transfer function structure used by I/O operations.
|
|
* @tb: Transfer buffers and mutex used by I/O operations.
|
|
* @edge_irq: the IRQ triggers on edges and need special handling.
|
|
* @hw_irq_trigger: if we're using the hardware interrupt on the sensor.
|
|
* @hw_timestamp: Latest timestamp from the interrupt handler, when in use.
|
|
*/
|
|
struct st_sensor_data {
|
|
struct device *dev;
|
|
struct iio_trigger *trig;
|
|
struct iio_mount_matrix *mount_matrix;
|
|
struct st_sensor_settings *sensor_settings;
|
|
struct st_sensor_fullscale_avl *current_fullscale;
|
|
struct regulator *vdd;
|
|
struct regulator *vdd_io;
|
|
|
|
bool enabled;
|
|
bool multiread_bit;
|
|
|
|
char *buffer_data;
|
|
|
|
unsigned int odr;
|
|
unsigned int num_data_channels;
|
|
|
|
u8 drdy_int_pin;
|
|
bool int_pin_open_drain;
|
|
|
|
unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
|
|
|
|
const struct st_sensor_transfer_function *tf;
|
|
struct st_sensor_transfer_buffer tb;
|
|
|
|
bool edge_irq;
|
|
bool hw_irq_trigger;
|
|
s64 hw_timestamp;
|
|
};
|
|
|
|
#ifdef CONFIG_IIO_BUFFER
|
|
irqreturn_t st_sensors_trigger_handler(int irq, void *p);
|
|
#endif
|
|
|
|
#ifdef CONFIG_IIO_TRIGGER
|
|
int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
|
|
const struct iio_trigger_ops *trigger_ops);
|
|
|
|
void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
|
|
int st_sensors_validate_device(struct iio_trigger *trig,
|
|
struct iio_dev *indio_dev);
|
|
#else
|
|
static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
|
|
const struct iio_trigger_ops *trigger_ops)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
|
|
{
|
|
return;
|
|
}
|
|
#define st_sensors_validate_device NULL
|
|
#endif
|
|
|
|
int st_sensors_init_sensor(struct iio_dev *indio_dev,
|
|
struct st_sensors_platform_data *pdata);
|
|
|
|
int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
|
|
|
|
int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
|
|
|
|
int st_sensors_power_enable(struct iio_dev *indio_dev);
|
|
|
|
void st_sensors_power_disable(struct iio_dev *indio_dev);
|
|
|
|
int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
|
|
unsigned reg, unsigned writeval,
|
|
unsigned *readval);
|
|
|
|
int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
|
|
|
|
int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
|
|
|
|
int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
|
|
|
|
int st_sensors_read_info_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *ch, int *val);
|
|
|
|
int st_sensors_check_device_support(struct iio_dev *indio_dev,
|
|
int num_sensors_list, const struct st_sensor_settings *sensor_settings);
|
|
|
|
ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
|
|
ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
|
|
#ifdef CONFIG_OF
|
|
void st_sensors_of_name_probe(struct device *dev,
|
|
const struct of_device_id *match,
|
|
char *name, int len);
|
|
#else
|
|
static inline void st_sensors_of_name_probe(struct device *dev,
|
|
const struct of_device_id *match,
|
|
char *name, int len)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* ST_SENSORS_H */
|