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/*
* Driver for the Analog Devices digital potentiometers
*
* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef _AD_DPOT_H_
#define _AD_DPOT_H_
#include <linux/types.h>
#define DPOT_CONF(features, wipers, max_pos, uid) \
(((features) << 18) | (((wipers) & 0xFF) << 10) | \
((max_pos & 0xF) << 6) | (uid & 0x3F))
#define DPOT_UID(conf) (conf & 0x3F)
#define DPOT_MAX_POS(conf) ((conf >> 6) & 0xF)
#define DPOT_WIPERS(conf) ((conf >> 10) & 0xFF)
#define DPOT_FEAT(conf) (conf >> 18)
#define BRDAC0 (1 << 0)
#define BRDAC1 (1 << 1)
#define BRDAC2 (1 << 2)
#define BRDAC3 (1 << 3)
#define BRDAC4 (1 << 4)
#define BRDAC5 (1 << 5)
#define F_CMD_INC (1 << 0) /* Features INC/DEC ALL, 6dB */
#define F_CMD_EEP (1 << 1) /* Features EEPROM */
#define F_CMD_TOL (1 << 2) /* RDACS are Read/Write + Tolerance REG */
#define F_RDACS_RW (1 << 3) /* RDACS are Read/Write + Tolerance REG */
#define F_RDACS_WONLY (1 << 4) /* RDACS are Write only */
#define F_AD_APPDATA (1 << 5) /* RDAC Address append to data */
#define F_SPI_8BIT (1 << 6) /* All SPI XFERS are 8-bit */
#define F_SPI_16BIT (1 << 7) /* All SPI XFERS are 16-bit */
#define F_SPI_24BIT (1 << 8) /* All SPI XFERS are 24-bit */
#define F_RDACS_RW_TOL (F_RDACS_RW | F_CMD_EEP | F_CMD_TOL)
#define F_RDACS_RW_EEP (F_RDACS_RW | F_CMD_EEP)
#define F_SPI (F_SPI_8BIT | F_SPI_16BIT | F_SPI_24BIT)
enum dpot_devid {
AD5258_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 6, 0), /* I2C */
AD5259_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 8, 1),
AD5251_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
BRDAC0 | BRDAC3, 6, 2),
AD5252_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
BRDAC0 | BRDAC3, 8, 3),
AD5253_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 4),
AD5254_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 5),
AD5255_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
BRDAC0 | BRDAC1 | BRDAC2, 9, 6),
AD5160_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 7), /* SPI */
AD5161_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 8),
AD5162_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1, 8, 9),
AD5165_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 10),
AD5200_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 11),
AD5201_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 5, 12),
AD5203_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 13),
AD5204_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 14),
AD5206_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3 | BRDAC4 | BRDAC5,
8, 15),
AD5207_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1, 8, 16),
AD5231_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
BRDAC0, 10, 17),
AD5232_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_16BIT,
BRDAC0 | BRDAC1, 8, 18),
AD5233_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_16BIT,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 19),
AD5235_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
BRDAC0 | BRDAC1, 10, 20),
AD5260_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 21),
AD5262_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1, 8, 22),
AD5263_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 23),
AD5290_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 24),
AD5291_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 8, 25),
AD5292_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 10, 26),
AD5293_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 10, 27),
AD7376_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 7, 28),
AD8400_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
BRDAC0, 8, 29),
AD8402_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1, 8, 30),
AD8403_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
BRDAC0 | BRDAC1 | BRDAC2, 8, 31),
ADN2850_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
BRDAC0 | BRDAC1, 10, 32),
};
#define DPOT_RDAC0 0
#define DPOT_RDAC1 1
#define DPOT_RDAC2 2
#define DPOT_RDAC3 3
#define DPOT_RDAC4 4
#define DPOT_RDAC5 5
#define DPOT_RDAC_MASK 0x1F
#define DPOT_REG_TOL 0x18
#define DPOT_TOL_RDAC0 (DPOT_REG_TOL | DPOT_RDAC0)
#define DPOT_TOL_RDAC1 (DPOT_REG_TOL | DPOT_RDAC1)
#define DPOT_TOL_RDAC2 (DPOT_REG_TOL | DPOT_RDAC2)
#define DPOT_TOL_RDAC3 (DPOT_REG_TOL | DPOT_RDAC3)
#define DPOT_TOL_RDAC4 (DPOT_REG_TOL | DPOT_RDAC4)
#define DPOT_TOL_RDAC5 (DPOT_REG_TOL | DPOT_RDAC5)
/* RDAC-to-EEPROM Interface Commands */
#define DPOT_ADDR_RDAC (0x00 << 5)
#define DPOT_ADDR_EEPROM (0x01 << 5)
#define DPOT_ADDR_CMD (0x80)
#define DPOT_DEC_ALL_6DB (DPOT_ADDR_CMD | (0x4 << 3))
#define DPOT_INC_ALL_6DB (DPOT_ADDR_CMD | (0x9 << 3))
#define DPOT_DEC_ALL (DPOT_ADDR_CMD | (0x6 << 3))
#define DPOT_INC_ALL (DPOT_ADDR_CMD | (0xB << 3))
#define DPOT_SPI_RDAC 0xB0
#define DPOT_SPI_EEPROM 0x30
#define DPOT_SPI_READ_RDAC 0xA0
#define DPOT_SPI_READ_EEPROM 0x90
#define DPOT_SPI_DEC_ALL_6DB 0x50
#define DPOT_SPI_INC_ALL_6DB 0xD0
#define DPOT_SPI_DEC_ALL 0x70
#define DPOT_SPI_INC_ALL 0xF0
/* AD5291/2/3 use special commands */
#define DPOT_AD5291_RDAC 0x01
#define DPOT_AD5291_READ_RDAC 0x02
struct dpot_data;
struct ad_dpot_bus_ops {
int (*read_d8) (void *client);
int (*read_r8d8) (void *client, u8 reg);
int (*read_r8d16) (void *client, u8 reg);
int (*write_d8) (void *client, u8 val);
int (*write_r8d8) (void *client, u8 reg, u8 val);
int (*write_r8d16) (void *client, u8 reg, u16 val);
};
struct ad_dpot_bus_data {
void *client;
const struct ad_dpot_bus_ops *bops;
};
struct ad_dpot_id {
char *name;
unsigned long devid;
};
int ad_dpot_probe(struct device *dev, struct ad_dpot_bus_data *bdata, const struct ad_dpot_id *id);
int ad_dpot_remove(struct device *dev);
#endif
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