LXR linux/drivers/iio/dac/ad5592r-base.h

   1/*
   2 * AD5592R / AD5593R Digital <-> Analog converters driver
   3 *
   4 * Copyright 2015-2016 Analog Devices Inc.
   5 * Author: Paul Cercueil <paul.cercueil@analog.com>
   6 *
   7 * Licensed under the GPL-2.
   8 */
   9
  10#ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__
  11#define __DRIVERS_IIO_DAC_AD5592R_BASE_H__
  12
  13#include <linux/types.h>
  14#include <linux/cache.h>
  15#include <linux/mutex.h>
  16#include <linux/gpio/driver.h>
  17
  18struct device;
  19struct ad5592r_state;
  20
  21enum ad5592r_registers {
  22        AD5592R_REG_NOOP                = 0x0,
  23        AD5592R_REG_DAC_READBACK        = 0x1,
  24        AD5592R_REG_ADC_SEQ             = 0x2,
  25        AD5592R_REG_CTRL                = 0x3,
  26        AD5592R_REG_ADC_EN              = 0x4,
  27        AD5592R_REG_DAC_EN              = 0x5,
  28        AD5592R_REG_PULLDOWN            = 0x6,
  29        AD5592R_REG_LDAC                = 0x7,
  30        AD5592R_REG_GPIO_OUT_EN         = 0x8,
  31        AD5592R_REG_GPIO_SET            = 0x9,
  32        AD5592R_REG_GPIO_IN_EN          = 0xA,
  33        AD5592R_REG_PD                  = 0xB,
  34        AD5592R_REG_OPEN_DRAIN          = 0xC,
  35        AD5592R_REG_TRISTATE            = 0xD,
  36        AD5592R_REG_RESET               = 0xF,
  37};
  38
  39#define AD5592R_REG_PD_EN_REF           BIT(9)
  40#define AD5592R_REG_CTRL_ADC_RANGE      BIT(5)
  41#define AD5592R_REG_CTRL_DAC_RANGE      BIT(4)
  42
  43struct ad5592r_rw_ops {
  44        int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value);
  45        int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value);
  46        int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value);
  47        int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value);
  48        int (*gpio_read)(struct ad5592r_state *st, u8 *value);
  49};
  50
  51struct ad5592r_state {
  52        struct device *dev;
  53        struct regulator *reg;
  54        struct gpio_chip gpiochip;
  55        struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */
  56        unsigned int num_channels;
  57        const struct ad5592r_rw_ops *ops;
  58        int scale_avail[2][2];
  59        u16 cached_dac[8];
  60        u16 cached_gp_ctrl;
  61        u8 channel_modes[8];
  62        u8 channel_offstate[8];
  63        u8 gpio_map;
  64        u8 gpio_out;
  65        u8 gpio_in;
  66        u8 gpio_val;
  67
  68        __be16 spi_msg ____cacheline_aligned;
  69        __be16 spi_msg_nop;
  70};
  71
  72int ad5592r_probe(struct device *dev, const char *name,
  73                const struct ad5592r_rw_ops *ops);
  74int ad5592r_remove(struct device *dev);
  75
  76#endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */
  77