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 51 struct device; 52 struct gpio_desc; 53 54 enum ad7091r_mode { 55 AD7091R_MODE_SAMPLE, 56 AD7091R_MODE_COMMAND, 57 AD7091R_MODE_AUTOCYCLE, 58 }; 59 60 struct 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 73 struct 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 82 struct 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 91 extern const struct iio_event_spec ad7091r_events[3]; 92 93 int ad7091r_probe(struct device *dev, const struct ad7091r_init_info *init_info, 94 int irq); 95 96 bool ad7091r_volatile_reg(struct device *dev, unsigned int reg); 97 bool ad7091r_writeable_reg(struct device *dev, unsigned int reg); 98 99 #endif /* __DRIVERS_IIO_ADC_AD7091R_BASE_H__ */ 100