2 * Driver for the Analog Devices digital potentiometers
4 * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
12 #include <linux/types.h>
14 #define DPOT_CONF(features, wipers, max_pos, uid) \
15 (((features) << 18) | (((wipers) & 0xFF) << 10) | \
16 ((max_pos & 0xF) << 6) | (uid & 0x3F))
18 #define DPOT_UID(conf) (conf & 0x3F)
19 #define DPOT_MAX_POS(conf) ((conf >> 6) & 0xF)
20 #define DPOT_WIPERS(conf) ((conf >> 10) & 0xFF)
21 #define DPOT_FEAT(conf) (conf >> 18)
23 #define BRDAC0 (1 << 0)
24 #define BRDAC1 (1 << 1)
25 #define BRDAC2 (1 << 2)
26 #define BRDAC3 (1 << 3)
27 #define BRDAC4 (1 << 4)
28 #define BRDAC5 (1 << 5)
30 #define F_CMD_INC (1 << 0) /* Features INC/DEC ALL, 6dB */
31 #define F_CMD_EEP (1 << 1) /* Features EEPROM */
32 #define F_CMD_OTP (1 << 2) /* Features OTP */
33 #define F_CMD_TOL (1 << 3) /* RDACS feature Tolerance REG */
34 #define F_RDACS_RW (1 << 4) /* RDACS are Read/Write */
35 #define F_RDACS_WONLY (1 << 5) /* RDACS are Write only */
36 #define F_AD_APPDATA (1 << 6) /* RDAC Address append to data */
37 #define F_SPI_8BIT (1 << 7) /* All SPI XFERS are 8-bit */
38 #define F_SPI_16BIT (1 << 8) /* All SPI XFERS are 16-bit */
39 #define F_SPI_24BIT (1 << 9) /* All SPI XFERS are 24-bit */
41 #define F_RDACS_RW_TOL (F_RDACS_RW | F_CMD_EEP | F_CMD_TOL)
42 #define F_RDACS_RW_EEP (F_RDACS_RW | F_CMD_EEP)
43 #define F_SPI (F_SPI_8BIT | F_SPI_16BIT | F_SPI_24BIT)
46 AD5258_ID
= DPOT_CONF(F_RDACS_RW_TOL
, BRDAC0
, 6, 0), /* I2C */
47 AD5259_ID
= DPOT_CONF(F_RDACS_RW_TOL
, BRDAC0
, 8, 1),
48 AD5251_ID
= DPOT_CONF(F_RDACS_RW_TOL
| F_CMD_INC
,
49 BRDAC0
| BRDAC3
, 6, 2),
50 AD5252_ID
= DPOT_CONF(F_RDACS_RW_TOL
| F_CMD_INC
,
51 BRDAC0
| BRDAC3
, 8, 3),
52 AD5253_ID
= DPOT_CONF(F_RDACS_RW_TOL
| F_CMD_INC
,
53 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 6, 4),
54 AD5254_ID
= DPOT_CONF(F_RDACS_RW_TOL
| F_CMD_INC
,
55 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 8, 5),
56 AD5255_ID
= DPOT_CONF(F_RDACS_RW_TOL
| F_CMD_INC
,
57 BRDAC0
| BRDAC1
| BRDAC2
, 9, 6),
58 AD5160_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
59 BRDAC0
, 8, 7), /* SPI */
60 AD5161_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
62 AD5162_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
63 BRDAC0
| BRDAC1
, 8, 9),
64 AD5165_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
66 AD5200_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
68 AD5201_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
70 AD5203_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
71 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 6, 13),
72 AD5204_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
73 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 8, 14),
74 AD5206_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
75 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
| BRDAC4
| BRDAC5
,
77 AD5207_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
78 BRDAC0
| BRDAC1
, 8, 16),
79 AD5231_ID
= DPOT_CONF(F_RDACS_RW_EEP
| F_CMD_INC
| F_SPI_24BIT
,
81 AD5232_ID
= DPOT_CONF(F_RDACS_RW_EEP
| F_CMD_INC
| F_SPI_16BIT
,
82 BRDAC0
| BRDAC1
, 8, 18),
83 AD5233_ID
= DPOT_CONF(F_RDACS_RW_EEP
| F_CMD_INC
| F_SPI_16BIT
,
84 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 6, 19),
85 AD5235_ID
= DPOT_CONF(F_RDACS_RW_EEP
| F_CMD_INC
| F_SPI_24BIT
,
86 BRDAC0
| BRDAC1
, 10, 20),
87 AD5260_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
89 AD5262_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
90 BRDAC0
| BRDAC1
, 8, 22),
91 AD5263_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
92 BRDAC0
| BRDAC1
| BRDAC2
| BRDAC3
, 8, 23),
93 AD5290_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
95 AD5291_ID
= DPOT_CONF(F_RDACS_RW
| F_SPI_16BIT
, BRDAC0
, 8, 25),
96 AD5292_ID
= DPOT_CONF(F_RDACS_RW
| F_SPI_16BIT
, BRDAC0
, 10, 26),
97 AD5293_ID
= DPOT_CONF(F_RDACS_RW
| F_SPI_16BIT
, BRDAC0
, 10, 27),
98 AD7376_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
100 AD8400_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_8BIT
,
102 AD8402_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
103 BRDAC0
| BRDAC1
, 8, 30),
104 AD8403_ID
= DPOT_CONF(F_RDACS_WONLY
| F_AD_APPDATA
| F_SPI_16BIT
,
105 BRDAC0
| BRDAC1
| BRDAC2
, 8, 31),
106 ADN2850_ID
= DPOT_CONF(F_RDACS_RW_EEP
| F_CMD_INC
| F_SPI_24BIT
,
107 BRDAC0
| BRDAC1
, 10, 32),
108 AD5241_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
, 8, 33),
109 AD5242_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
| BRDAC1
, 8, 34),
110 AD5243_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
| BRDAC1
, 8, 35),
111 AD5245_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
, 8, 36),
112 AD5246_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
, 7, 37),
113 AD5247_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
, 7, 38),
114 AD5248_ID
= DPOT_CONF(F_RDACS_RW
, BRDAC0
| BRDAC1
, 8, 39),
126 #define DPOT_RDAC_MASK 0x1F
128 #define DPOT_REG_TOL 0x18
129 #define DPOT_TOL_RDAC0 (DPOT_REG_TOL | DPOT_RDAC0)
130 #define DPOT_TOL_RDAC1 (DPOT_REG_TOL | DPOT_RDAC1)
131 #define DPOT_TOL_RDAC2 (DPOT_REG_TOL | DPOT_RDAC2)
132 #define DPOT_TOL_RDAC3 (DPOT_REG_TOL | DPOT_RDAC3)
133 #define DPOT_TOL_RDAC4 (DPOT_REG_TOL | DPOT_RDAC4)
134 #define DPOT_TOL_RDAC5 (DPOT_REG_TOL | DPOT_RDAC5)
136 /* RDAC-to-EEPROM Interface Commands */
137 #define DPOT_ADDR_RDAC (0x00 << 5)
138 #define DPOT_ADDR_EEPROM (0x01 << 5)
139 #define DPOT_ADDR_CMD (0x80)
141 #define DPOT_DEC_ALL_6DB (DPOT_ADDR_CMD | (0x4 << 3))
142 #define DPOT_INC_ALL_6DB (DPOT_ADDR_CMD | (0x9 << 3))
143 #define DPOT_DEC_ALL (DPOT_ADDR_CMD | (0x6 << 3))
144 #define DPOT_INC_ALL (DPOT_ADDR_CMD | (0xB << 3))
146 #define DPOT_SPI_RDAC 0xB0
147 #define DPOT_SPI_EEPROM 0x30
148 #define DPOT_SPI_READ_RDAC 0xA0
149 #define DPOT_SPI_READ_EEPROM 0x90
150 #define DPOT_SPI_DEC_ALL_6DB 0x50
151 #define DPOT_SPI_INC_ALL_6DB 0xD0
152 #define DPOT_SPI_DEC_ALL 0x70
153 #define DPOT_SPI_INC_ALL 0xF0
155 /* AD5291/2/3 use special commands */
156 #define DPOT_AD5291_RDAC 0x01
157 #define DPOT_AD5291_READ_RDAC 0x02
159 /* AD524x use special commands */
160 #define DPOT_AD5291_RDAC_AB 0x80
164 struct ad_dpot_bus_ops
{
165 int (*read_d8
) (void *client
);
166 int (*read_r8d8
) (void *client
, u8 reg
);
167 int (*read_r8d16
) (void *client
, u8 reg
);
168 int (*write_d8
) (void *client
, u8 val
);
169 int (*write_r8d8
) (void *client
, u8 reg
, u8 val
);
170 int (*write_r8d16
) (void *client
, u8 reg
, u16 val
);
173 struct ad_dpot_bus_data
{
175 const struct ad_dpot_bus_ops
*bops
;
183 int ad_dpot_probe(struct device
*dev
, struct ad_dpot_bus_data
*bdata
, const struct ad_dpot_id
*id
);
184 int ad_dpot_remove(struct device
*dev
);
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