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
  18 struct device;
  19 struct ad5592r_state;
  20
  21 enum 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
  43 struct 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
  51 struct 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
  72 int ad5592r_probe(struct device *dev, const char *name,
  73                 const struct ad5592r_rw_ops *ops);
  74 int ad5592r_remove(struct device *dev);
  75
  76 #endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */