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 | |
19 | struct device; |
20 | struct ad5592r_state; |
21 | |
22 | enum 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 | |
44 | struct 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 | |
52 | struct 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 | |
74 | int ad5592r_probe(struct device *dev, const char *name, |
75 | const struct ad5592r_rw_ops *ops); |
76 | void ad5592r_remove(struct device *dev); |
77 | |
78 | #endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */ |
79 | |