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7abd9fb6 SS |
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> | |
1fd4c0cd | 14 | #include <linux/mod_devicetable.h> |
7abd9fb6 SS |
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"), | |
ca1547ab SS |
60 | MP2629_MAP(INPUT_CURRENT, "input-current"), |
61 | { } | |
7abd9fb6 SS |
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(info->regmap, chan->address, &rval); | |
75 | if (ret) | |
76 | return ret; | |
77 | ||
1eb20332 | 78 | if (chan->channel == MP2629_INPUT_VOLT) |
7abd9fb6 SS |
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->parent); | |
121 | struct mp2629_adc *info; | |
122 | struct iio_dev *indio_dev; | |
123 | int ret; | |
124 | ||
125 | indio_dev = devm_iio_device_alloc(dev, 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, indio_dev); | |
133 | ||
134 | ret = regmap_update_bits(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, 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"; | |
7abd9fb6 SS |
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(info->regmap, MP2629_REG_ADC_CTRL, | |
167 | MP2629_ADC_CONTINUOUS, 0); | |
168 | regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, | |
169 | MP2629_ADC_START, 0); | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
174 | static int 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(info->regmap, MP2629_REG_ADC_CTRL, | |
184 | MP2629_ADC_CONTINUOUS, 0); | |
185 | regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, | |
186 | MP2629_ADC_START, 0); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static const struct of_device_id mp2629_adc_of_match[] = { | |
192 | { .compatible = "mps,mp2629_adc"}, | |
193 | {} | |
194 | }; | |
195 | MODULE_DEVICE_TABLE(of, mp2629_adc_of_match); | |
196 | ||
197 | static struct platform_driver mp2629_adc_driver = { | |
198 | .driver = { | |
199 | .name = "mp2629_adc", | |
200 | .of_match_table = mp2629_adc_of_match, | |
201 | }, | |
202 | .probe = mp2629_adc_probe, | |
203 | .remove = mp2629_adc_remove, | |
204 | }; | |
205 | module_platform_driver(mp2629_adc_driver); | |
206 | ||
207 | MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); | |
208 | MODULE_DESCRIPTION("MP2629 ADC driver"); | |
209 | MODULE_LICENSE("GPL"); |