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