aboutsummaryrefslogtreecommitdiff
path: root/drivers/misc/ad525x_dpot-spi.c
blob: f4c82eafa8e57a15cda2da73c6f276fb09f5c0b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*
 * Driver for the Analog Devices digital potentiometers (SPI bus)
 *
 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/spi/spi.h>
#include <linux/module.h>

#include "ad525x_dpot.h"

/* SPI bus functions */
static int write8(void *client, u8 val)
{
	u8 data = val;

	return spi_write(client, &data, 1);
}

static int write16(void *client, u8 reg, u8 val)
{
	u8 data[2] = {reg, val};

	return spi_write(client, data, 2);
}

static int write24(void *client, u8 reg, u16 val)
{
	u8 data[3] = {reg, val >> 8, val};

	return spi_write(client, data, 3);
}

static int read8(void *client)
{
	int ret;
	u8 data;

	ret = spi_read(client, &data, 1);
	if (ret < 0)
		return ret;

	return data;
}

static int read16(void *client, u8 reg)
{
	int ret;
	u8 buf_rx[2];

	write16(client, reg, 0);
	ret = spi_read(client, buf_rx, 2);
	if (ret < 0)
		return ret;

	return (buf_rx[0] << 8) |  buf_rx[1];
}

static int read24(void *client, u8 reg)
{
	int ret;
	u8 buf_rx[3];

	write24(client, reg, 0);
	ret = spi_read(client, buf_rx, 3);
	if (ret < 0)
		return ret;

	return (buf_rx[1] << 8) |  buf_rx[2];
}

static const struct ad_dpot_bus_ops bops = {
	.read_d8	= read8,
	.read_r8d8	= read16,
	.read_r8d16	= read24,
	.write_d8	= write8,
	.write_r8d8	= write16,
	.write_r8d16	= write24,
};
static int ad_dpot_spi_probe(struct spi_device *spi)
{
	struct ad_dpot_bus_data bdata = {
		.client = spi,
		.bops = &bops,
	};

	return ad_dpot_probe(&spi->dev, &bdata,
			     spi_get_device_id(spi)->driver_data,
			     spi_get_device_id(spi)->name);
}

static int ad_dpot_spi_remove(struct spi_device *spi)
{
	return ad_dpot_remove(&spi->dev);
}

static const struct spi_device_id ad_dpot_spi_id[] = {
	{"ad5160", AD5160_ID},
	{"ad5161", AD5161_ID},
	{"ad5162", AD5162_ID},
	{"ad5165", AD5165_ID},
	{"ad5200", AD5200_ID},
	{"ad5201", AD5201_ID},
	{"ad5203", AD5203_ID},
	{"ad5204", AD5204_ID},
	{"ad5206", AD5206_ID},
	{"ad5207", AD5207_ID},
	{"ad5231", AD5231_ID},
	{"ad5232", AD5232_ID},
	{"ad5233", AD5233_ID},
	{"ad5235", AD5235_ID},
	{"ad5260", AD5260_ID},
	{"ad5262", AD5262_ID},
	{"ad5263", AD5263_ID},
	{"ad5290", AD5290_ID},
	{"ad5291", AD5291_ID},
	{"ad5292", AD5292_ID},
	{"ad5293", AD5293_ID},
	{"ad7376", AD7376_ID},
	{"ad8400", AD8400_ID},
	{"ad8402", AD8402_ID},
	{"ad8403", AD8403_ID},
	{"adn2850", ADN2850_ID},
	{"ad5270", AD5270_ID},
	{"ad5271", AD5271_ID},
	{}
};
MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);

static struct spi_driver ad_dpot_spi_driver = {
	.driver = {
		.name	= "ad_dpot",
		.owner	= THIS_MODULE,
	},
	.probe		= ad_dpot_spi_probe,
	.remove		= ad_dpot_spi_remove,
	.id_table	= ad_dpot_spi_id,
};

module_spi_driver(ad_dpot_spi_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad_dpot");