| Paul Cercueil | 56ca9db | 2016-04-05 09:46:19 +0200 | [diff] [blame] | 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__ */ |