adgm3121.h

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/***************************************************************************/
#ifndef ADGM3121_H_
#define ADGM3121_H_
 
#include <stdint.h>
#include <stdbool.h>
#include "no_os_spi.h"
#include "no_os_gpio.h"
 
/* ADGM3121 Register Addresses */
#define ADGM3121_REG_SWITCH_DATA    0x20
 
/* ADGM3121 Register Bits */
#define ADGM3121_SW1_EN         NO_OS_BIT(0)
#define ADGM3121_SW2_EN         NO_OS_BIT(1)
#define ADGM3121_SW3_EN         NO_OS_BIT(2)
#define ADGM3121_SW4_EN         NO_OS_BIT(3)
#define ADGM3121_INTERNAL_ERROR     NO_OS_GENMASK(7, 6)
#define ADGM3121_RESERVED       NO_OS_GENMASK(5, 4)
 
/* SPI Command Format */
#define ADGM3121_SPI_READ       NO_OS_BIT(15)
#define ADGM3121_SPI_WRITE      0
#define ADGM3121_SPI_ADDR_MSK       NO_OS_GENMASK(14, 8)
#define ADGM3121_SPI_DAISY_CHAIN_CMD    0x2500
 
/* Default timeout values */
#define ADGM3121_SWITCHING_TIME_US  200
#define ADGM3121_POWER_UP_TIME_MS   45

enum adgm3121_switch {
    ADGM3121_SW1,
    ADGM3121_SW2,
    ADGM3121_SW3,
    ADGM3121_SW4,
};

enum adgm3121_state {
    ADGM3121_DISABLE,
    ADGM3121_ENABLE,
};

enum adgm3121_mode {
    ADGM3121_MODE_PARALLEL,   /* GPIO parallel control mode */
    ADGM3121_MODE_SPI, /* SPI control mode */
};

struct adgm3121_dev {
    /* SPI descriptor */
    struct no_os_spi_desc *spi_desc;
    /* GPIO descriptors for parallel mode */
    struct no_os_gpio_desc *gpio_in1;
    struct no_os_gpio_desc *gpio_in2;
    struct no_os_gpio_desc *gpio_in3;
    struct no_os_gpio_desc *gpio_in4;
    /* PIN/SPI mode select GPIO */
    struct no_os_gpio_desc *gpio_pin_spi;
    /* Control mode */
    enum adgm3121_mode mode;
    /* Current switch states cache */
    uint8_t switch_states;
    /* SPI daisy chain mode */
    bool daisy_chain_mode;
};

struct adgm3121_init_param {
    /* SPI initialization parameters */
    struct no_os_spi_init_param spi_init;
    /* GPIO initialization parameters for parallel mode */
    struct no_os_gpio_init_param gpio_in1;
    struct no_os_gpio_init_param gpio_in2;
    struct no_os_gpio_init_param gpio_in3;
    struct no_os_gpio_init_param gpio_in4;
    /* PIN/SPI mode select GPIO */
    struct no_os_gpio_init_param gpio_pin_spi;
    /* Control mode */
    enum adgm3121_mode mode;
};
 
/* Function prototypes */
 
/* Initialize the device */
int adgm3121_init(struct adgm3121_dev **device,
          struct adgm3121_init_param *init_param);
 
/* Free resources allocated by adgm3121_init() */
int adgm3121_remove(struct adgm3121_dev *dev);
 
/* Set the state of a specific switch */
int adgm3121_set_switch_state(struct adgm3121_dev *dev,
                  enum adgm3121_switch sw,
                  enum adgm3121_state state);
 
/* Get the current state of a specific switch */
int adgm3121_get_switch_state(struct adgm3121_dev *dev,
                  enum adgm3121_switch sw,
                  enum adgm3121_state *state);
 
/* Set multiple switches at once using bitmask */
int adgm3121_set_switches(struct adgm3121_dev *dev, uint8_t switch_mask);
 
/* Get all switch states as bitmask */
int adgm3121_get_switches(struct adgm3121_dev *dev, uint8_t *switch_mask);
 
/* Reset all switches to off state */
int adgm3121_reset_switches(struct adgm3121_dev *dev);
 
/* Enter SPI daisy chain mode */
int adgm3121_enter_daisy_chain_mode(struct adgm3121_dev *dev);
 
/* Check for internal errors */
int adgm3121_check_internal_error(struct adgm3121_dev *dev,
                  uint8_t *error_status);
 
/* Write to device register (SPI mode only) */
int adgm3121_write_register(struct adgm3121_dev *dev, uint8_t reg_addr,
                uint8_t data);
 
/* Read from device register (SPI mode only) */
int adgm3121_read_register(struct adgm3121_dev *dev, uint8_t reg_addr,
               uint8_t *data);
 
#endif /* ADGM3121_H_ */