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80503b23 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6c536e4c MH |
2 | /* |
3 | * Driver for the Analog Devices digital potentiometers (SPI bus) | |
4 | * | |
7f3379de | 5 | * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. |
6c536e4c MH |
6 | */ |
7 | ||
8 | #include <linux/spi/spi.h> | |
9 | #include <linux/module.h> | |
10 | ||
11 | #include "ad525x_dpot.h" | |
12 | ||
6c536e4c MH |
13 | /* SPI bus functions */ |
14 | static int write8(void *client, u8 val) | |
15 | { | |
16 | u8 data = val; | |
c076860d | 17 | |
6c536e4c MH |
18 | return spi_write(client, &data, 1); |
19 | } | |
20 | ||
21 | static int write16(void *client, u8 reg, u8 val) | |
22 | { | |
23 | u8 data[2] = {reg, val}; | |
c076860d | 24 | |
1f9fa521 | 25 | return spi_write(client, data, 2); |
6c536e4c MH |
26 | } |
27 | ||
28 | static int write24(void *client, u8 reg, u16 val) | |
29 | { | |
30 | u8 data[3] = {reg, val >> 8, val}; | |
c076860d | 31 | |
1f9fa521 | 32 | return spi_write(client, data, 3); |
6c536e4c MH |
33 | } |
34 | ||
35 | static int read8(void *client) | |
36 | { | |
37 | int ret; | |
38 | u8 data; | |
c076860d | 39 | |
6c536e4c MH |
40 | ret = spi_read(client, &data, 1); |
41 | if (ret < 0) | |
42 | return ret; | |
43 | ||
44 | return data; | |
45 | } | |
46 | ||
47 | static int read16(void *client, u8 reg) | |
48 | { | |
49 | int ret; | |
50 | u8 buf_rx[2]; | |
51 | ||
52 | write16(client, reg, 0); | |
53 | ret = spi_read(client, buf_rx, 2); | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | ||
57 | return (buf_rx[0] << 8) | buf_rx[1]; | |
58 | } | |
59 | ||
60 | static int read24(void *client, u8 reg) | |
61 | { | |
62 | int ret; | |
63 | u8 buf_rx[3]; | |
64 | ||
65 | write24(client, reg, 0); | |
66 | ret = spi_read(client, buf_rx, 3); | |
67 | if (ret < 0) | |
68 | return ret; | |
69 | ||
70 | return (buf_rx[1] << 8) | buf_rx[2]; | |
71 | } | |
72 | ||
73 | static const struct ad_dpot_bus_ops bops = { | |
74 | .read_d8 = read8, | |
75 | .read_r8d8 = read16, | |
76 | .read_r8d16 = read24, | |
77 | .write_d8 = write8, | |
78 | .write_r8d8 = write16, | |
79 | .write_r8d16 = write24, | |
80 | }; | |
80c8ae28 | 81 | static int ad_dpot_spi_probe(struct spi_device *spi) |
6c536e4c | 82 | { |
6c536e4c MH |
83 | struct ad_dpot_bus_data bdata = { |
84 | .client = spi, | |
85 | .bops = &bops, | |
86 | }; | |
87 | ||
7f3379de MH |
88 | return ad_dpot_probe(&spi->dev, &bdata, |
89 | spi_get_device_id(spi)->driver_data, | |
90 | spi_get_device_id(spi)->name); | |
6c536e4c MH |
91 | } |
92 | ||
486a5c28 | 93 | static int ad_dpot_spi_remove(struct spi_device *spi) |
6c536e4c MH |
94 | { |
95 | return ad_dpot_remove(&spi->dev); | |
96 | } | |
97 | ||
7f3379de MH |
98 | static const struct spi_device_id ad_dpot_spi_id[] = { |
99 | {"ad5160", AD5160_ID}, | |
100 | {"ad5161", AD5161_ID}, | |
101 | {"ad5162", AD5162_ID}, | |
102 | {"ad5165", AD5165_ID}, | |
103 | {"ad5200", AD5200_ID}, | |
104 | {"ad5201", AD5201_ID}, | |
105 | {"ad5203", AD5203_ID}, | |
106 | {"ad5204", AD5204_ID}, | |
107 | {"ad5206", AD5206_ID}, | |
108 | {"ad5207", AD5207_ID}, | |
109 | {"ad5231", AD5231_ID}, | |
110 | {"ad5232", AD5232_ID}, | |
111 | {"ad5233", AD5233_ID}, | |
112 | {"ad5235", AD5235_ID}, | |
113 | {"ad5260", AD5260_ID}, | |
114 | {"ad5262", AD5262_ID}, | |
115 | {"ad5263", AD5263_ID}, | |
116 | {"ad5290", AD5290_ID}, | |
117 | {"ad5291", AD5291_ID}, | |
118 | {"ad5292", AD5292_ID}, | |
119 | {"ad5293", AD5293_ID}, | |
120 | {"ad7376", AD7376_ID}, | |
121 | {"ad8400", AD8400_ID}, | |
122 | {"ad8402", AD8402_ID}, | |
123 | {"ad8403", AD8403_ID}, | |
124 | {"adn2850", ADN2850_ID}, | |
125 | {"ad5270", AD5270_ID}, | |
126 | {"ad5271", AD5271_ID}, | |
127 | {} | |
128 | }; | |
129 | MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id); | |
130 | ||
6c536e4c MH |
131 | static struct spi_driver ad_dpot_spi_driver = { |
132 | .driver = { | |
133 | .name = "ad_dpot", | |
6c536e4c MH |
134 | }, |
135 | .probe = ad_dpot_spi_probe, | |
2d6bed9c | 136 | .remove = ad_dpot_spi_remove, |
7f3379de | 137 | .id_table = ad_dpot_spi_id, |
6c536e4c MH |
138 | }; |
139 | ||
a3dc3c9e | 140 | module_spi_driver(ad_dpot_spi_driver); |
6c536e4c | 141 | |
dbd71398 | 142 | MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); |
6c536e4c MH |
143 | MODULE_DESCRIPTION("digital potentiometer SPI bus driver"); |
144 | MODULE_LICENSE("GPL"); | |
145 | MODULE_ALIAS("spi:ad_dpot"); |