1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AD5592R / AD5593R Digital <-> Analog converters driver
4 *
5 * Copyright 2015-2016 Analog Devices Inc.
6 * Author: Paul Cercueil <paul.cercueil@analog.com>
7 */
8
9#ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__
10#define __DRIVERS_IIO_DAC_AD5592R_BASE_H__
11
12#include <linux/types.h>
13#include <linux/cache.h>
14#include <linux/mutex.h>
15#include <linux/gpio/driver.h>
16
17#include <linux/iio/iio.h>
18
19struct device;
20struct ad5592r_state;
21
22enum ad5592r_registers {
23 AD5592R_REG_NOOP = 0x0,
24 AD5592R_REG_DAC_READBACK = 0x1,
25 AD5592R_REG_ADC_SEQ = 0x2,
26 AD5592R_REG_CTRL = 0x3,
27 AD5592R_REG_ADC_EN = 0x4,
28 AD5592R_REG_DAC_EN = 0x5,
29 AD5592R_REG_PULLDOWN = 0x6,
30 AD5592R_REG_LDAC = 0x7,
31 AD5592R_REG_GPIO_OUT_EN = 0x8,
32 AD5592R_REG_GPIO_SET = 0x9,
33 AD5592R_REG_GPIO_IN_EN = 0xA,
34 AD5592R_REG_PD = 0xB,
35 AD5592R_REG_OPEN_DRAIN = 0xC,
36 AD5592R_REG_TRISTATE = 0xD,
37 AD5592R_REG_RESET = 0xF,
38};
39
40#define AD5592R_REG_PD_EN_REF BIT(9)
41#define AD5592R_REG_CTRL_ADC_RANGE BIT(5)
42#define AD5592R_REG_CTRL_DAC_RANGE BIT(4)
43
44struct ad5592r_rw_ops {
45 int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value);
46 int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value);
47 int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value);
48 int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value);
49 int (*gpio_read)(struct ad5592r_state *st, u8 *value);
50};
51
52struct ad5592r_state {
53 struct device *dev;
54 struct regulator *reg;
55 struct gpio_chip gpiochip;
56 struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */
57 struct mutex lock;
58 unsigned int num_channels;
59 const struct ad5592r_rw_ops *ops;
60 int scale_avail[2][2];
61 u16 cached_dac[8];
62 u16 cached_gp_ctrl;
63 u8 channel_modes[8];
64 u8 channel_offstate[8];
65 u8 gpio_map;
66 u8 gpio_out;
67 u8 gpio_in;
68 u8 gpio_val;
69
70 __be16 spi_msg __aligned(IIO_DMA_MINALIGN);
71 __be16 spi_msg_nop;
72};
73
74int ad5592r_probe(struct device *dev, const char *name,
75 const struct ad5592r_rw_ops *ops);
76void ad5592r_remove(struct device *dev);
77
78#endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */
79

source code of linux/drivers/iio/dac/ad5592r-base.h