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/*
* AD5791 SPI DAC driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#ifndef SPI_AD5791_H_
#define SPI_AD5791_H_
#define AD5791_RES_MASK(x) ((1 << (x)) - 1)
#define AD5791_DAC_MASK AD5791_RES_MASK(20)
#define AD5791_DAC_MSB (1 << 19)
#define AD5791_CMD_READ (1 << 23)
#define AD5791_CMD_WRITE (0 << 23)
#define AD5791_ADDR(addr) ((addr) << 20)
/* Registers */
#define AD5791_ADDR_NOOP 0
#define AD5791_ADDR_DAC0 1
#define AD5791_ADDR_CTRL 2
#define AD5791_ADDR_CLRCODE 3
#define AD5791_ADDR_SW_CTRL 4
/* Control Register */
#define AD5791_CTRL_RBUF (1 << 1)
#define AD5791_CTRL_OPGND (1 << 2)
#define AD5791_CTRL_DACTRI (1 << 3)
#define AD5791_CTRL_BIN2SC (1 << 4)
#define AD5791_CTRL_SDODIS (1 << 5)
#define AD5761_CTRL_LINCOMP(x) ((x) << 6)
#define AD5791_LINCOMP_0_10 0
#define AD5791_LINCOMP_10_12 1
#define AD5791_LINCOMP_12_16 2
#define AD5791_LINCOMP_16_19 3
#define AD5791_LINCOMP_19_20 12
#define AD5780_LINCOMP_0_10 0
#define AD5780_LINCOMP_10_20 12
/* Software Control Register */
#define AD5791_SWCTRL_LDAC (1 << 0)
#define AD5791_SWCTRL_CLR (1 << 1)
#define AD5791_SWCTRL_RESET (1 << 2)
#define AD5791_DAC_PWRDN_6K 0
#define AD5791_DAC_PWRDN_3STATE 1
/*
* TODO: struct ad5791_platform_data needs to go into include/linux/iio
*/
/**
* struct ad5791_platform_data - platform specific information
* @vref_pos_mv: Vdd Positive Analog Supply Volatge (mV)
* @vref_neg_mv: Vdd Negative Analog Supply Volatge (mV)
* @use_rbuf_gain2: ext. amplifier connected in gain of two configuration
*/
struct ad5791_platform_data {
u16 vref_pos_mv;
u16 vref_neg_mv;
bool use_rbuf_gain2;
};
/**
* struct ad5791_chip_info - chip specific information
* @get_lin_comp: function pointer to the device specific function
*/
struct ad5791_chip_info {
int (*get_lin_comp) (unsigned int span);
};
/**
* struct ad5791_state - driver instance specific data
* @us: spi_device
* @reg_vdd: positive supply regulator
* @reg_vss: negative supply regulator
* @chip_info: chip model specific constants
* @vref_mv: actual reference voltage used
* @vref_neg_mv: voltage of the negative supply
* @pwr_down_mode current power down mode
*/
struct ad5791_state {
struct spi_device *spi;
struct regulator *reg_vdd;
struct regulator *reg_vss;
const struct ad5791_chip_info *chip_info;
unsigned short vref_mv;
unsigned int vref_neg_mv;
unsigned ctrl;
unsigned pwr_down_mode;
bool pwr_down;
};
/**
* ad5791_supported_device_ids:
*/
enum ad5791_supported_device_ids {
ID_AD5760,
ID_AD5780,
ID_AD5781,
ID_AD5791,
};
#endif /* SPI_AD5791_H_ */
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