1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * MP2629 Driver for ADC |
4 | * |
5 | * Copyright 2020 Monolithic Power Systems, Inc |
6 | * |
7 | * Author: Saravanan Sekar <sravanhome@gmail.com> |
8 | */ |
9 | |
10 | #include <linux/iio/driver.h> |
11 | #include <linux/iio/iio.h> |
12 | #include <linux/iio/machine.h> |
13 | #include <linux/mfd/mp2629.h> |
14 | #include <linux/mod_devicetable.h> |
15 | #include <linux/module.h> |
16 | #include <linux/mutex.h> |
17 | #include <linux/platform_device.h> |
18 | #include <linux/regmap.h> |
19 | |
20 | #define MP2629_REG_ADC_CTRL 0x03 |
21 | #define MP2629_REG_BATT_VOLT 0x0e |
22 | #define MP2629_REG_SYSTEM_VOLT 0x0f |
23 | #define MP2629_REG_INPUT_VOLT 0x11 |
24 | #define MP2629_REG_BATT_CURRENT 0x12 |
25 | #define MP2629_REG_INPUT_CURRENT 0x13 |
26 | |
27 | #define MP2629_ADC_START BIT(7) |
28 | #define MP2629_ADC_CONTINUOUS BIT(6) |
29 | |
30 | #define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc) |
31 | |
32 | #define MP2629_ADC_CHAN(_ch, _type) { \ |
33 | .type = _type, \ |
34 | .indexed = 1, \ |
35 | .datasheet_name = #_ch, \ |
36 | .channel = MP2629_ ## _ch, \ |
37 | .address = MP2629_REG_ ## _ch, \ |
38 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
39 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
40 | } |
41 | |
42 | struct mp2629_adc { |
43 | struct regmap *regmap; |
44 | struct device *dev; |
45 | }; |
46 | |
47 | static struct iio_chan_spec mp2629_channels[] = { |
48 | MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE), |
49 | MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE), |
50 | MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE), |
51 | MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT), |
52 | MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT) |
53 | }; |
54 | |
55 | static struct iio_map mp2629_adc_maps[] = { |
56 | MP2629_MAP(BATT_VOLT, "batt-volt" ), |
57 | MP2629_MAP(SYSTEM_VOLT, "system-volt" ), |
58 | MP2629_MAP(INPUT_VOLT, "input-volt" ), |
59 | MP2629_MAP(BATT_CURRENT, "batt-current" ), |
60 | MP2629_MAP(INPUT_CURRENT, "input-current" ), |
61 | { } |
62 | }; |
63 | |
64 | static int mp2629_read_raw(struct iio_dev *indio_dev, |
65 | struct iio_chan_spec const *chan, |
66 | int *val, int *val2, long mask) |
67 | { |
68 | struct mp2629_adc *info = iio_priv(indio_dev); |
69 | unsigned int rval; |
70 | int ret; |
71 | |
72 | switch (mask) { |
73 | case IIO_CHAN_INFO_RAW: |
74 | ret = regmap_read(map: info->regmap, reg: chan->address, val: &rval); |
75 | if (ret) |
76 | return ret; |
77 | |
78 | if (chan->channel == MP2629_INPUT_VOLT) |
79 | rval &= GENMASK(6, 0); |
80 | *val = rval; |
81 | return IIO_VAL_INT; |
82 | |
83 | case IIO_CHAN_INFO_SCALE: |
84 | switch (chan->channel) { |
85 | case MP2629_BATT_VOLT: |
86 | case MP2629_SYSTEM_VOLT: |
87 | *val = 20; |
88 | return IIO_VAL_INT; |
89 | |
90 | case MP2629_INPUT_VOLT: |
91 | *val = 60; |
92 | return IIO_VAL_INT; |
93 | |
94 | case MP2629_BATT_CURRENT: |
95 | *val = 175; |
96 | *val2 = 10; |
97 | return IIO_VAL_FRACTIONAL; |
98 | |
99 | case MP2629_INPUT_CURRENT: |
100 | *val = 133; |
101 | *val2 = 10; |
102 | return IIO_VAL_FRACTIONAL; |
103 | |
104 | default: |
105 | return -EINVAL; |
106 | } |
107 | |
108 | default: |
109 | return -EINVAL; |
110 | } |
111 | } |
112 | |
113 | static const struct iio_info mp2629_adc_info = { |
114 | .read_raw = &mp2629_read_raw, |
115 | }; |
116 | |
117 | static int mp2629_adc_probe(struct platform_device *pdev) |
118 | { |
119 | struct device *dev = &pdev->dev; |
120 | struct mp2629_data *ddata = dev_get_drvdata(dev: dev->parent); |
121 | struct mp2629_adc *info; |
122 | struct iio_dev *indio_dev; |
123 | int ret; |
124 | |
125 | indio_dev = devm_iio_device_alloc(parent: dev, sizeof_priv: sizeof(*info)); |
126 | if (!indio_dev) |
127 | return -ENOMEM; |
128 | |
129 | info = iio_priv(indio_dev); |
130 | info->regmap = ddata->regmap; |
131 | info->dev = dev; |
132 | platform_set_drvdata(pdev, data: indio_dev); |
133 | |
134 | ret = regmap_update_bits(map: info->regmap, MP2629_REG_ADC_CTRL, |
135 | MP2629_ADC_START | MP2629_ADC_CONTINUOUS, |
136 | MP2629_ADC_START | MP2629_ADC_CONTINUOUS); |
137 | if (ret) { |
138 | dev_err(dev, "adc enable fail: %d\n" , ret); |
139 | return ret; |
140 | } |
141 | |
142 | ret = iio_map_array_register(indio_dev, map: mp2629_adc_maps); |
143 | if (ret) { |
144 | dev_err(dev, "IIO maps register fail: %d\n" , ret); |
145 | goto fail_disable; |
146 | } |
147 | |
148 | indio_dev->name = "mp2629-adc" ; |
149 | indio_dev->channels = mp2629_channels; |
150 | indio_dev->num_channels = ARRAY_SIZE(mp2629_channels); |
151 | indio_dev->modes = INDIO_DIRECT_MODE; |
152 | indio_dev->info = &mp2629_adc_info; |
153 | |
154 | ret = iio_device_register(indio_dev); |
155 | if (ret) { |
156 | dev_err(dev, "IIO device register fail: %d\n" , ret); |
157 | goto fail_map_unregister; |
158 | } |
159 | |
160 | return 0; |
161 | |
162 | fail_map_unregister: |
163 | iio_map_array_unregister(indio_dev); |
164 | |
165 | fail_disable: |
166 | regmap_update_bits(map: info->regmap, MP2629_REG_ADC_CTRL, |
167 | MP2629_ADC_CONTINUOUS, val: 0); |
168 | regmap_update_bits(map: info->regmap, MP2629_REG_ADC_CTRL, |
169 | MP2629_ADC_START, val: 0); |
170 | |
171 | return ret; |
172 | } |
173 | |
174 | static void mp2629_adc_remove(struct platform_device *pdev) |
175 | { |
176 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
177 | struct mp2629_adc *info = iio_priv(indio_dev); |
178 | |
179 | iio_device_unregister(indio_dev); |
180 | |
181 | iio_map_array_unregister(indio_dev); |
182 | |
183 | regmap_update_bits(map: info->regmap, MP2629_REG_ADC_CTRL, |
184 | MP2629_ADC_CONTINUOUS, val: 0); |
185 | regmap_update_bits(map: info->regmap, MP2629_REG_ADC_CTRL, |
186 | MP2629_ADC_START, val: 0); |
187 | } |
188 | |
189 | static const struct of_device_id mp2629_adc_of_match[] = { |
190 | { .compatible = "mps,mp2629_adc" }, |
191 | {} |
192 | }; |
193 | MODULE_DEVICE_TABLE(of, mp2629_adc_of_match); |
194 | |
195 | static struct platform_driver mp2629_adc_driver = { |
196 | .driver = { |
197 | .name = "mp2629_adc" , |
198 | .of_match_table = mp2629_adc_of_match, |
199 | }, |
200 | .probe = mp2629_adc_probe, |
201 | .remove_new = mp2629_adc_remove, |
202 | }; |
203 | module_platform_driver(mp2629_adc_driver); |
204 | |
205 | MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>" ); |
206 | MODULE_DESCRIPTION("MP2629 ADC driver" ); |
207 | MODULE_LICENSE("GPL" ); |
208 | |