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Michael Hennerich6c536e42010-05-24 14:33:14 -07001/*
2 * Driver for the Analog Devices digital potentiometers (SPI bus)
3 *
Michael Hennerich7f3379d2011-11-18 11:05:11 +01004 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
Michael Hennerich6c536e42010-05-24 14:33:14 -07005 *
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
Michael Hennerich6c536e42010-05-24 14:33:14 -070014/* SPI bus functions */
15static int write8(void *client, u8 val)
16{
17 u8 data = val;
Mohammad Jamalc0768602014-12-18 07:24:11 +053018
Michael Hennerich6c536e42010-05-24 14:33:14 -070019 return spi_write(client, &data, 1);
20}
21
22static int write16(void *client, u8 reg, u8 val)
23{
24 u8 data[2] = {reg, val};
Mohammad Jamalc0768602014-12-18 07:24:11 +053025
Michael Hennerich1f9fa522010-10-26 14:21:16 -070026 return spi_write(client, data, 2);
Michael Hennerich6c536e42010-05-24 14:33:14 -070027}
28
29static int write24(void *client, u8 reg, u16 val)
30{
31 u8 data[3] = {reg, val >> 8, val};
Mohammad Jamalc0768602014-12-18 07:24:11 +053032
Michael Hennerich1f9fa522010-10-26 14:21:16 -070033 return spi_write(client, data, 3);
Michael Hennerich6c536e42010-05-24 14:33:14 -070034}
35
36static int read8(void *client)
37{
38 int ret;
39 u8 data;
Mohammad Jamalc0768602014-12-18 07:24:11 +053040
Michael Hennerich6c536e42010-05-24 14:33:14 -070041 ret = spi_read(client, &data, 1);
42 if (ret < 0)
43 return ret;
44
45 return data;
46}
47
48static 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
61static 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
74static 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};
Bill Pemberton80c8ae22012-11-19 13:23:05 -050082static int ad_dpot_spi_probe(struct spi_device *spi)
Michael Hennerich6c536e42010-05-24 14:33:14 -070083{
Michael Hennerich6c536e42010-05-24 14:33:14 -070084 struct ad_dpot_bus_data bdata = {
85 .client = spi,
86 .bops = &bops,
87 };
88
Michael Hennerich7f3379d2011-11-18 11:05:11 +010089 return ad_dpot_probe(&spi->dev, &bdata,
90 spi_get_device_id(spi)->driver_data,
91 spi_get_device_id(spi)->name);
Michael Hennerich6c536e42010-05-24 14:33:14 -070092}
93
Bill Pemberton486a5c22012-11-19 13:26:02 -050094static int ad_dpot_spi_remove(struct spi_device *spi)
Michael Hennerich6c536e42010-05-24 14:33:14 -070095{
96 return ad_dpot_remove(&spi->dev);
97}
98
Michael Hennerich7f3379d2011-11-18 11:05:11 +010099static 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};
130MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
131
Michael Hennerich6c536e42010-05-24 14:33:14 -0700132static struct spi_driver ad_dpot_spi_driver = {
133 .driver = {
134 .name = "ad_dpot",
Michael Hennerich6c536e42010-05-24 14:33:14 -0700135 .owner = THIS_MODULE,
136 },
137 .probe = ad_dpot_spi_probe,
Bill Pemberton2d6bed92012-11-19 13:21:23 -0500138 .remove = ad_dpot_spi_remove,
Michael Hennerich7f3379d2011-11-18 11:05:11 +0100139 .id_table = ad_dpot_spi_id,
Michael Hennerich6c536e42010-05-24 14:33:14 -0700140};
141
Axel Lina3dc3c92012-01-22 15:38:22 +0800142module_spi_driver(ad_dpot_spi_driver);
Michael Hennerich6c536e42010-05-24 14:33:14 -0700143
144MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
145MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
146MODULE_LICENSE("GPL");
147MODULE_ALIAS("spi:ad_dpot");