1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for the Analog Devices digital potentiometers (SPI bus)
4 *
5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
6 */
7
8#include <linux/spi/spi.h>
9#include <linux/module.h>
10
11#include "ad525x_dpot.h"
12
13/* SPI bus functions */
14static int write8(void *client, u8 val)
15{
16	u8 data = val;
17
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
25	return spi_write(client, data, 2);
26}
27
28static int write24(void *client, u8 reg, u16 val)
29{
30	u8 data[3] = {reg, val >> 8, val};
31
32	return spi_write(client, data, 3);
33}
34
35static int read8(void *client)
36{
37	int ret;
38	u8 data;
39
40	ret = spi_read(client, &data, 1);
41	if (ret < 0)
42		return ret;
43
44	return data;
45}
46
47static 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
60static 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
73static 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};
81static int ad_dpot_spi_probe(struct spi_device *spi)
82{
83	struct ad_dpot_bus_data bdata = {
84		.client = spi,
85		.bops = &bops,
86	};
87
88	return ad_dpot_probe(&spi->dev, &bdata,
89			     spi_get_device_id(spi)->driver_data,
90			     spi_get_device_id(spi)->name);
91}
92
93static int ad_dpot_spi_remove(struct spi_device *spi)
94{
95	return ad_dpot_remove(&spi->dev);
96}
97
98static 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};
129MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
130
131static struct spi_driver ad_dpot_spi_driver = {
132	.driver = {
133		.name	= "ad_dpot",
134	},
135	.probe		= ad_dpot_spi_probe,
136	.remove		= ad_dpot_spi_remove,
137	.id_table	= ad_dpot_spi_id,
138};
139
140module_spi_driver(ad_dpot_spi_driver);
141
142MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
143MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
144MODULE_LICENSE("GPL");
145MODULE_ALIAS("spi:ad_dpot");
146