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/*
* 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>
#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_NUMBER_DATA_CHANNELS 3
#define ST_SENSORS_ENABLE_ALL_AXIS 0x07
#define ST_SENSORS_BYTE_FOR_CHANNEL 2
#define ST_SENSORS_SCAN_X 0
#define ST_SENSORS_SCAN_Y 1
#define ST_SENSORS_SCAN_Z 2
#define ST_SENSORS_DEFAULT_12_REALBITS 12
#define ST_SENSORS_DEFAULT_16_REALBITS 16
#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_MAX_NAME 17
#define ST_SENSORS_MAX_4WAI 7
#define ST_SENSORS_LSM_CHANNELS(device_type, index, mod, endian, bits, addr) \
{ \
.type = device_type, \
.modified = 1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = index, \
.channel2 = mod, \
.address = addr, \
.scan_type = { \
.sign = 's', \
.realbits = bits, \
.shift = 16 - bits, \
.storagebits = 16, \
.endianness = endian, \
}, \
}
#define ST_SENSOR_DEV_ATTR_SAMP_FREQ() \
IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, \
st_sensors_sysfs_get_sampling_frequency, \
st_sensors_sysfs_set_sampling_frequency)
#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_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_data_ready_irq - ST sensor device data-ready interrupt
* @addr: address of the register.
* @mask: mask to write the on/off value.
* 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 {
u8 addr;
u8 mask;
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_sensors - ST sensors list
* @wai: Contents 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.
* @drdy_irq: Data ready 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_sensors {
u8 wai;
char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
struct iio_chan_spec *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_data_ready_irq drdy_irq;
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: Pointer to the current sensor struct in use.
* @current_fullscale: Maximum range of measure by the sensor.
* @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].
* @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.
*/
struct st_sensor_data {
struct device *dev;
struct iio_trigger *trig;
struct st_sensors *sensor;
struct st_sensor_fullscale_avl *current_fullscale;
bool enabled;
bool multiread_bit;
char *buffer_data;
unsigned int odr;
unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
const struct st_sensor_transfer_function *tf;
struct st_sensor_transfer_buffer tb;
};
#ifdef CONFIG_IIO_BUFFER
irqreturn_t st_sensors_trigger_handler(int irq, void *p);
int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
#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);
#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;
}
#endif
int st_sensors_init_sensor(struct iio_dev *indio_dev);
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_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_sensors *sensors);
ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev,
struct device_attribute *attr, char *buf);
ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size);
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);
#endif /* ST_SENSORS_H */
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