1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * AD5592R Digital <-> Analog converters driver |
4 | * |
5 | * Copyright 2015-2016 Analog Devices Inc. |
6 | * Author: Paul Cercueil <paul.cercueil@analog.com> |
7 | */ |
8 | |
9 | #include "ad5592r-base.h" |
10 | |
11 | #include <linux/bitops.h> |
12 | #include <linux/module.h> |
13 | #include <linux/mod_devicetable.h> |
14 | #include <linux/spi/spi.h> |
15 | |
16 | #define AD5592R_GPIO_READBACK_EN BIT(10) |
17 | #define AD5592R_LDAC_READBACK_EN BIT(6) |
18 | |
19 | static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, __be16 *buf) |
20 | { |
21 | struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
22 | struct spi_transfer t = { |
23 | .tx_buf = &st->spi_msg_nop, |
24 | .rx_buf = buf, |
25 | .len = 2 |
26 | }; |
27 | |
28 | st->spi_msg_nop = 0; /* NOP */ |
29 | |
30 | return spi_sync_transfer(spi, xfers: &t, num_xfers: 1); |
31 | } |
32 | |
33 | static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) |
34 | { |
35 | struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
36 | |
37 | st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value); |
38 | |
39 | return spi_write(spi, buf: &st->spi_msg, len: sizeof(st->spi_msg)); |
40 | } |
41 | |
42 | static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) |
43 | { |
44 | struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
45 | int ret; |
46 | |
47 | st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan)); |
48 | |
49 | ret = spi_write(spi, buf: &st->spi_msg, len: sizeof(st->spi_msg)); |
50 | if (ret) |
51 | return ret; |
52 | |
53 | /* |
54 | * Invalid data: |
55 | * See Figure 40. Single-Channel ADC Conversion Sequence |
56 | */ |
57 | ret = ad5592r_spi_wnop_r16(st, buf: &st->spi_msg); |
58 | if (ret) |
59 | return ret; |
60 | |
61 | ret = ad5592r_spi_wnop_r16(st, buf: &st->spi_msg); |
62 | if (ret) |
63 | return ret; |
64 | |
65 | *value = be16_to_cpu(st->spi_msg); |
66 | |
67 | return 0; |
68 | } |
69 | |
70 | static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) |
71 | { |
72 | struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
73 | |
74 | st->spi_msg = cpu_to_be16((reg << 11) | value); |
75 | |
76 | return spi_write(spi, buf: &st->spi_msg, len: sizeof(st->spi_msg)); |
77 | } |
78 | |
79 | static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) |
80 | { |
81 | struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
82 | int ret; |
83 | |
84 | st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) | |
85 | AD5592R_LDAC_READBACK_EN | (reg << 2)); |
86 | |
87 | ret = spi_write(spi, buf: &st->spi_msg, len: sizeof(st->spi_msg)); |
88 | if (ret) |
89 | return ret; |
90 | |
91 | ret = ad5592r_spi_wnop_r16(st, buf: &st->spi_msg); |
92 | if (ret) |
93 | return ret; |
94 | |
95 | *value = be16_to_cpu(st->spi_msg); |
96 | |
97 | return 0; |
98 | } |
99 | |
100 | static int ad5592r_gpio_read(struct ad5592r_state *st, u8 *value) |
101 | { |
102 | int ret; |
103 | |
104 | ret = ad5592r_reg_write(st, reg: AD5592R_REG_GPIO_IN_EN, |
105 | AD5592R_GPIO_READBACK_EN | st->gpio_in); |
106 | if (ret) |
107 | return ret; |
108 | |
109 | ret = ad5592r_spi_wnop_r16(st, buf: &st->spi_msg); |
110 | if (ret) |
111 | return ret; |
112 | |
113 | *value = (u8) be16_to_cpu(st->spi_msg); |
114 | |
115 | return 0; |
116 | } |
117 | |
118 | static const struct ad5592r_rw_ops ad5592r_rw_ops = { |
119 | .write_dac = ad5592r_write_dac, |
120 | .read_adc = ad5592r_read_adc, |
121 | .reg_write = ad5592r_reg_write, |
122 | .reg_read = ad5592r_reg_read, |
123 | .gpio_read = ad5592r_gpio_read, |
124 | }; |
125 | |
126 | static int ad5592r_spi_probe(struct spi_device *spi) |
127 | { |
128 | const struct spi_device_id *id = spi_get_device_id(sdev: spi); |
129 | |
130 | return ad5592r_probe(dev: &spi->dev, name: id->name, ops: &ad5592r_rw_ops); |
131 | } |
132 | |
133 | static void ad5592r_spi_remove(struct spi_device *spi) |
134 | { |
135 | ad5592r_remove(dev: &spi->dev); |
136 | } |
137 | |
138 | static const struct spi_device_id ad5592r_spi_ids[] = { |
139 | { .name = "ad5592r" , }, |
140 | {} |
141 | }; |
142 | MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids); |
143 | |
144 | static const struct of_device_id ad5592r_of_match[] = { |
145 | { .compatible = "adi,ad5592r" , }, |
146 | {}, |
147 | }; |
148 | MODULE_DEVICE_TABLE(of, ad5592r_of_match); |
149 | |
150 | static const struct acpi_device_id ad5592r_acpi_match[] = { |
151 | {"ADS5592" , }, |
152 | { }, |
153 | }; |
154 | MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match); |
155 | |
156 | static struct spi_driver ad5592r_spi_driver = { |
157 | .driver = { |
158 | .name = "ad5592r" , |
159 | .of_match_table = ad5592r_of_match, |
160 | .acpi_match_table = ad5592r_acpi_match, |
161 | }, |
162 | .probe = ad5592r_spi_probe, |
163 | .remove = ad5592r_spi_remove, |
164 | .id_table = ad5592r_spi_ids, |
165 | }; |
166 | module_spi_driver(ad5592r_spi_driver); |
167 | |
168 | MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>" ); |
169 | MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters" ); |
170 | MODULE_LICENSE("GPL v2" ); |
171 | MODULE_IMPORT_NS(IIO_AD5592R); |
172 | |