1 /* 2 * AD5592R / AD5593R Digital <-> Analog converters driver 3 * 4 * Copyright 2015-2016 Analog Devices Inc. 5 * Author: Paul Cercueil <paul.cercueil@analog.com> 6 * 7 * Licensed under the GPL-2. 8 */ 9 10 #ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__ 11 #define __DRIVERS_IIO_DAC_AD5592R_BASE_H__ 12 13 #include <linux/types.h> 14 #include <linux/cache.h> 15 #include <linux/mutex.h> 16 #include <linux/gpio/driver.h> 17 18 struct device; 19 struct ad5592r_state; 20 21 enum ad5592r_registers { 22 AD5592R_REG_NOOP = 0x0, 23 AD5592R_REG_DAC_READBACK = 0x1, 24 AD5592R_REG_ADC_SEQ = 0x2, 25 AD5592R_REG_CTRL = 0x3, 26 AD5592R_REG_ADC_EN = 0x4, 27 AD5592R_REG_DAC_EN = 0x5, 28 AD5592R_REG_PULLDOWN = 0x6, 29 AD5592R_REG_LDAC = 0x7, 30 AD5592R_REG_GPIO_OUT_EN = 0x8, 31 AD5592R_REG_GPIO_SET = 0x9, 32 AD5592R_REG_GPIO_IN_EN = 0xA, 33 AD5592R_REG_PD = 0xB, 34 AD5592R_REG_OPEN_DRAIN = 0xC, 35 AD5592R_REG_TRISTATE = 0xD, 36 AD5592R_REG_RESET = 0xF, 37 }; 38 39 #define AD5592R_REG_PD_EN_REF BIT(9) 40 #define AD5592R_REG_CTRL_ADC_RANGE BIT(5) 41 #define AD5592R_REG_CTRL_DAC_RANGE BIT(4) 42 43 struct ad5592r_rw_ops { 44 int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value); 45 int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value); 46 int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value); 47 int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value); 48 int (*gpio_read)(struct ad5592r_state *st, u8 *value); 49 }; 50 51 struct ad5592r_state { 52 struct device *dev; 53 struct regulator *reg; 54 struct gpio_chip gpiochip; 55 struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */ 56 unsigned int num_channels; 57 const struct ad5592r_rw_ops *ops; 58 int scale_avail[2][2]; 59 u16 cached_dac[8]; 60 u16 cached_gp_ctrl; 61 u8 channel_modes[8]; 62 u8 channel_offstate[8]; 63 u8 gpio_map; 64 u8 gpio_out; 65 u8 gpio_in; 66 u8 gpio_val; 67 68 __be16 spi_msg ____cacheline_aligned; 69 __be16 spi_msg_nop; 70 }; 71 72 int ad5592r_probe(struct device *dev, const char *name, 73 const struct ad5592r_rw_ops *ops); 74 int ad5592r_remove(struct device *dev); 75 76 #endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */ 77