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

source code of linux/drivers/iio/adc/ad7091r-base.h