359 lines
10 KiB
C
359 lines
10 KiB
C
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/*
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* STMicroelectronics sensors library driver
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*
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* Copyright 2012-2013 STMicroelectronics Inc.
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*
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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_SENSORS_H
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#define ST_SENSORS_H
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#include <linux/i2c.h>
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#include <linux/spi/spi.h>
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#include <linux/irqreturn.h>
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#include <linux/iio/trigger.h>
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#include <linux/bitops.h>
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#include <linux/regulator/consumer.h>
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#include <linux/platform_data/st_sensors_pdata.h>
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#define ST_SENSORS_TX_MAX_LENGTH 2
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#define ST_SENSORS_RX_MAX_LENGTH 6
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#define ST_SENSORS_ODR_LIST_MAX 10
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#define ST_SENSORS_FULLSCALE_AVL_MAX 10
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#define ST_SENSORS_NUMBER_ALL_CHANNELS 4
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#define ST_SENSORS_ENABLE_ALL_AXIS 0x07
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#define ST_SENSORS_SCAN_X 0
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#define ST_SENSORS_SCAN_Y 1
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#define ST_SENSORS_SCAN_Z 2
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#define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
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#define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
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#define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
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#define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
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#define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
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#define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
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#define ST_SENSORS_DEFAULT_STAT_ADDR 0x27
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#define ST_SENSORS_MAX_NAME 17
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#define ST_SENSORS_MAX_4WAI 7
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#define ST_SENSORS_LSM_CHANNELS(device_type, mask, index, mod, \
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ch2, s, endian, rbits, sbits, addr) \
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{ \
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.type = device_type, \
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.modified = mod, \
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.info_mask_separate = mask, \
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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.scan_index = index, \
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.channel2 = ch2, \
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.address = addr, \
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.scan_type = { \
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.sign = s, \
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.realbits = rbits, \
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.shift = sbits - rbits, \
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.storagebits = sbits, \
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.endianness = endian, \
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}, \
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}
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#define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
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IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
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st_sensors_sysfs_sampling_frequency_avail)
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#define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
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IIO_DEVICE_ATTR(name, S_IRUGO, \
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st_sensors_sysfs_scale_avail, NULL , 0);
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struct st_sensor_odr_avl {
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unsigned int hz;
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u8 value;
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};
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struct st_sensor_odr {
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u8 addr;
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u8 mask;
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struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
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};
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struct st_sensor_power {
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u8 addr;
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u8 mask;
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u8 value_off;
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u8 value_on;
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};
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struct st_sensor_axis {
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u8 addr;
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u8 mask;
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};
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struct st_sensor_fullscale_avl {
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unsigned int num;
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u8 value;
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unsigned int gain;
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unsigned int gain2;
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};
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struct st_sensor_fullscale {
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u8 addr;
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u8 mask;
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struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
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};
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struct st_sensor_sim {
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u8 addr;
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u8 value;
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};
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/**
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* struct st_sensor_bdu - ST sensor device block data update
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* @addr: address of the register.
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* @mask: mask to write the block data update flag.
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*/
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struct st_sensor_bdu {
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u8 addr;
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u8 mask;
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};
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/**
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* struct st_sensor_das - ST sensor device data alignment selection
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* @addr: address of the register.
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* @mask: mask to write the das flag for left alignment.
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*/
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struct st_sensor_das {
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u8 addr;
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u8 mask;
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};
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/**
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* struct st_sensor_int_drdy - ST sensor device drdy line parameters
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* @addr: address of INT drdy register.
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* @mask: mask to enable drdy line.
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* @addr_od: address to enable/disable Open Drain on the INT line.
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* @mask_od: mask to enable/disable Open Drain on the INT line.
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*/
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struct st_sensor_int_drdy {
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u8 addr;
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u8 mask;
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u8 addr_od;
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u8 mask_od;
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};
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/**
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* struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
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* struct int1 - data-ready configuration register for INT1 pin.
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* struct int2 - data-ready configuration register for INT2 pin.
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* @addr_ihl: address to enable/disable active low on the INT lines.
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* @mask_ihl: mask to enable/disable active low on the INT lines.
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* struct stat_drdy - status register of DRDY (data ready) interrupt.
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* struct ig1 - represents the Interrupt Generator 1 of sensors.
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* @en_addr: address of the enable ig1 register.
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* @en_mask: mask to write the on/off value for enable.
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*/
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struct st_sensor_data_ready_irq {
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struct st_sensor_int_drdy int1;
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struct st_sensor_int_drdy int2;
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u8 addr_ihl;
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u8 mask_ihl;
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struct {
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u8 addr;
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u8 mask;
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} stat_drdy;
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struct {
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u8 en_addr;
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u8 en_mask;
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} ig1;
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};
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/**
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* struct st_sensor_transfer_buffer - ST sensor device I/O buffer
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* @buf_lock: Mutex to protect rx and tx buffers.
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* @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
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* This buffer is used to avoid DMA not-aligned issue.
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* @rx_buf: Buffer used by SPI transfer to receive data from sensors.
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* This buffer is used to avoid DMA not-aligned issue.
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*/
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struct st_sensor_transfer_buffer {
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struct mutex buf_lock;
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u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
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u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
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};
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/**
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* struct st_sensor_transfer_function - ST sensor device I/O function
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* @read_byte: Function used to read one byte.
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* @write_byte: Function used to write one byte.
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* @read_multiple_byte: Function used to read multiple byte.
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*/
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struct st_sensor_transfer_function {
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int (*read_byte) (struct st_sensor_transfer_buffer *tb,
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struct device *dev, u8 reg_addr, u8 *res_byte);
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int (*write_byte) (struct st_sensor_transfer_buffer *tb,
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struct device *dev, u8 reg_addr, u8 data);
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int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
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struct device *dev, u8 reg_addr, int len, u8 *data,
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bool multiread_bit);
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};
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/**
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* struct st_sensor_settings - ST specific sensor settings
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* @wai: Contents of WhoAmI register.
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* @wai_addr: The address of WhoAmI register.
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* @sensors_supported: List of supported sensors by struct itself.
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* @ch: IIO channels for the sensor.
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* @odr: Output data rate register and ODR list available.
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* @pw: Power register of the sensor.
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* @enable_axis: Enable one or more axis of the sensor.
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* @fs: Full scale register and full scale list available.
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* @bdu: Block data update register.
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* @das: Data Alignment Selection register.
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* @drdy_irq: Data ready register of the sensor.
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* @sim: SPI serial interface mode register of the sensor.
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* @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
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* @bootime: samples to discard when sensor passing from power-down to power-up.
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*/
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struct st_sensor_settings {
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u8 wai;
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u8 wai_addr;
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char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
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struct iio_chan_spec *ch;
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int num_ch;
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struct st_sensor_odr odr;
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struct st_sensor_power pw;
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struct st_sensor_axis enable_axis;
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struct st_sensor_fullscale fs;
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struct st_sensor_bdu bdu;
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struct st_sensor_das das;
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struct st_sensor_data_ready_irq drdy_irq;
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struct st_sensor_sim sim;
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bool multi_read_bit;
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unsigned int bootime;
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};
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/**
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* struct st_sensor_data - ST sensor device status
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* @dev: Pointer to instance of struct device (I2C or SPI).
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* @trig: The trigger in use by the core driver.
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* @sensor_settings: Pointer to the specific sensor settings in use.
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* @current_fullscale: Maximum range of measure by the sensor.
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* @vdd: Pointer to sensor's Vdd power supply
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* @vdd_io: Pointer to sensor's Vdd-IO power supply
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* @enabled: Status of the sensor (false->off, true->on).
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* @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
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* @buffer_data: Data used by buffer part.
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* @odr: Output data rate of the sensor [Hz].
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* num_data_channels: Number of data channels used in buffer.
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* @drdy_int_pin: Redirect DRDY on pin 1 (1) or pin 2 (2).
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* @int_pin_open_drain: Set the interrupt/DRDY to open drain.
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* @get_irq_data_ready: Function to get the IRQ used for data ready signal.
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* @tf: Transfer function structure used by I/O operations.
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* @tb: Transfer buffers and mutex used by I/O operations.
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* @edge_irq: the IRQ triggers on edges and need special handling.
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* @hw_irq_trigger: if we're using the hardware interrupt on the sensor.
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* @hw_timestamp: Latest timestamp from the interrupt handler, when in use.
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*/
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struct st_sensor_data {
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struct device *dev;
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struct iio_trigger *trig;
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struct st_sensor_settings *sensor_settings;
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struct st_sensor_fullscale_avl *current_fullscale;
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struct regulator *vdd;
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struct regulator *vdd_io;
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bool enabled;
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bool multiread_bit;
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char *buffer_data;
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unsigned int odr;
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unsigned int num_data_channels;
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u8 drdy_int_pin;
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bool int_pin_open_drain;
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unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
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const struct st_sensor_transfer_function *tf;
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struct st_sensor_transfer_buffer tb;
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bool edge_irq;
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bool hw_irq_trigger;
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s64 hw_timestamp;
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};
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#ifdef CONFIG_IIO_BUFFER
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irqreturn_t st_sensors_trigger_handler(int irq, void *p);
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#endif
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#ifdef CONFIG_IIO_TRIGGER
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int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
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const struct iio_trigger_ops *trigger_ops);
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void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
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int st_sensors_validate_device(struct iio_trigger *trig,
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struct iio_dev *indio_dev);
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#else
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static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
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const struct iio_trigger_ops *trigger_ops)
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{
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return 0;
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}
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static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
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{
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return;
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}
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#define st_sensors_validate_device NULL
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#endif
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int st_sensors_init_sensor(struct iio_dev *indio_dev,
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struct st_sensors_platform_data *pdata);
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int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
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int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
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int st_sensors_power_enable(struct iio_dev *indio_dev);
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void st_sensors_power_disable(struct iio_dev *indio_dev);
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int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
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unsigned reg, unsigned writeval,
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unsigned *readval);
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int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
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int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
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int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
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int st_sensors_read_info_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *ch, int *val);
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int st_sensors_check_device_support(struct iio_dev *indio_dev,
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int num_sensors_list, const struct st_sensor_settings *sensor_settings);
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ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
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struct device_attribute *attr, char *buf);
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ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
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struct device_attribute *attr, char *buf);
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#ifdef CONFIG_OF
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void st_sensors_of_name_probe(struct device *dev,
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const struct of_device_id *match,
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char *name, int len);
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#else
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static inline void st_sensors_of_name_probe(struct device *dev,
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const struct of_device_id *match,
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char *name, int len)
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{
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}
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#endif
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#endif /* ST_SENSORS_H */
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