1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * AD7091RX Analog to Digital converter driver 4 * 5 * Copyright 2014-2019 Analog Devices Inc. 6 */ 7 8#ifndef __DRIVERS_IIO_ADC_AD7091R_BASE_H__ 9#define __DRIVERS_IIO_ADC_AD7091R_BASE_H__ 10 11#include <linux/regmap.h> 12 13#define AD7091R_REG_RESULT 0 14#define AD7091R_REG_CHANNEL 1 15#define AD7091R_REG_CONF 2 16#define AD7091R_REG_ALERT 3 17#define AD7091R_REG_CH_LOW_LIMIT(ch) ((ch) * 3 + 4) 18#define AD7091R_REG_CH_HIGH_LIMIT(ch) ((ch) * 3 + 5) 19#define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6) 20 21/* AD7091R_REG_RESULT */ 22#define AD7091R5_REG_RESULT_CH_ID(x) (((x) >> 13) & 0x3) 23#define AD7091R8_REG_RESULT_CH_ID(x) (((x) >> 13) & 0x7) 24#define AD7091R_REG_RESULT_CONV_RESULT(x) ((x) & 0xfff) 25 26/* AD7091R_REG_CONF */ 27#define AD7091R_REG_CONF_INT_VREF BIT(0) 28#define AD7091R_REG_CONF_ALERT_EN BIT(4) 29#define AD7091R_REG_CONF_AUTO BIT(8) 30#define AD7091R_REG_CONF_CMD BIT(10) 31 32#define AD7091R_REG_CONF_MODE_MASK \ 33 (AD7091R_REG_CONF_AUTO | AD7091R_REG_CONF_CMD) 34 35/* AD7091R_REG_CH_LIMIT */ 36#define AD7091R_HIGH_LIMIT 0xFFF 37#define AD7091R_LOW_LIMIT 0x0 38 39#define AD7091R_CHANNEL(idx, bits, ev, num_ev) { \ 40 .type = IIO_VOLTAGE, \ 41 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 42 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 43 .indexed = 1, \ 44 .channel = idx, \ 45 .event_spec = ev, \ 46 .num_event_specs = num_ev, \ 47 .scan_type.storagebits = 16, \ 48 .scan_type.realbits = bits, \ 49} 50 51struct device; 52struct gpio_desc; 53 54enum ad7091r_mode { 55 AD7091R_MODE_SAMPLE, 56 AD7091R_MODE_COMMAND, 57 AD7091R_MODE_AUTOCYCLE, 58}; 59 60struct ad7091r_state { 61 struct device *dev; 62 struct regmap *map; 63 struct gpio_desc *convst_gpio; 64 struct gpio_desc *reset_gpio; 65 struct regulator *vref; 66 const struct ad7091r_chip_info *chip_info; 67 enum ad7091r_mode mode; 68 struct mutex lock; /*lock to prevent concurent reads */ 69 __be16 tx_buf __aligned(IIO_DMA_MINALIGN); 70 __be16 rx_buf; 71}; 72 73struct ad7091r_chip_info { 74 const char *name; 75 unsigned int num_channels; 76 const struct iio_chan_spec *channels; 77 unsigned int vref_mV; 78 unsigned int (*reg_result_chan_id)(unsigned int val); 79 int (*set_mode)(struct ad7091r_state *st, enum ad7091r_mode mode); 80}; 81 82struct ad7091r_init_info { 83 const struct ad7091r_chip_info *info_irq; 84 const struct ad7091r_chip_info *info_no_irq; 85 const struct regmap_config *regmap_config; 86 void (*init_adc_regmap)(struct ad7091r_state *st, 87 const struct regmap_config *regmap_conf); 88 int (*setup)(struct ad7091r_state *st); 89}; 90 91extern const struct iio_event_spec ad7091r_events[3]; 92 93int ad7091r_probe(struct device *dev, const struct ad7091r_init_info *init_info, 94 int irq); 95 96bool ad7091r_volatile_reg(struct device *dev, unsigned int reg); 97bool ad7091r_writeable_reg(struct device *dev, unsigned int reg); 98 99#endif /* __DRIVERS_IIO_ADC_AD7091R_BASE_H__ */ 100