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