Root/drivers/misc/ad525x_dpot-spi.c

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

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