This source file includes following definitions.
- tpl0102_read_raw
- tpl0102_read_avail
- tpl0102_write_raw
- tpl0102_probe
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11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/regmap.h>
14 #include <linux/iio/iio.h>
15
16 struct tpl0102_cfg {
17 int wipers;
18 int avail[3];
19 int kohms;
20 };
21
22 enum tpl0102_type {
23 CAT5140_503,
24 CAT5140_104,
25 TPL0102_104,
26 TPL0401_103,
27 };
28
29 static const struct tpl0102_cfg tpl0102_cfg[] = {
30
31 [CAT5140_503] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 50, },
32 [CAT5140_104] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 100, },
33
34 [TPL0102_104] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100 },
35 [TPL0401_103] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, },
36 };
37
38 struct tpl0102_data {
39 struct regmap *regmap;
40 const struct tpl0102_cfg *cfg;
41 };
42
43 static const struct regmap_config tpl0102_regmap_config = {
44 .reg_bits = 8,
45 .val_bits = 8,
46 };
47
48 #define TPL0102_CHANNEL(ch) { \
49 .type = IIO_RESISTANCE, \
50 .indexed = 1, \
51 .output = 1, \
52 .channel = (ch), \
53 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
54 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
55 .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW), \
56 }
57
58 static const struct iio_chan_spec tpl0102_channels[] = {
59 TPL0102_CHANNEL(0),
60 TPL0102_CHANNEL(1),
61 };
62
63 static int tpl0102_read_raw(struct iio_dev *indio_dev,
64 struct iio_chan_spec const *chan,
65 int *val, int *val2, long mask)
66 {
67 struct tpl0102_data *data = iio_priv(indio_dev);
68
69 switch (mask) {
70 case IIO_CHAN_INFO_RAW: {
71 int ret = regmap_read(data->regmap, chan->channel, val);
72
73 return ret ? ret : IIO_VAL_INT;
74 }
75 case IIO_CHAN_INFO_SCALE:
76 *val = 1000 * data->cfg->kohms;
77 *val2 = data->cfg->avail[2] + 1;
78 return IIO_VAL_FRACTIONAL;
79 }
80
81 return -EINVAL;
82 }
83
84 static int tpl0102_read_avail(struct iio_dev *indio_dev,
85 struct iio_chan_spec const *chan,
86 const int **vals, int *type, int *length,
87 long mask)
88 {
89 struct tpl0102_data *data = iio_priv(indio_dev);
90
91 switch (mask) {
92 case IIO_CHAN_INFO_RAW:
93 *length = ARRAY_SIZE(data->cfg->avail);
94 *vals = data->cfg->avail;
95 *type = IIO_VAL_INT;
96 return IIO_AVAIL_RANGE;
97 }
98
99 return -EINVAL;
100 }
101
102 static int tpl0102_write_raw(struct iio_dev *indio_dev,
103 struct iio_chan_spec const *chan,
104 int val, int val2, long mask)
105 {
106 struct tpl0102_data *data = iio_priv(indio_dev);
107
108 if (mask != IIO_CHAN_INFO_RAW)
109 return -EINVAL;
110
111 if (val > data->cfg->avail[2] || val < 0)
112 return -EINVAL;
113
114 return regmap_write(data->regmap, chan->channel, val);
115 }
116
117 static const struct iio_info tpl0102_info = {
118 .read_raw = tpl0102_read_raw,
119 .read_avail = tpl0102_read_avail,
120 .write_raw = tpl0102_write_raw,
121 };
122
123 static int tpl0102_probe(struct i2c_client *client,
124 const struct i2c_device_id *id)
125 {
126 struct device *dev = &client->dev;
127 struct tpl0102_data *data;
128 struct iio_dev *indio_dev;
129
130 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
131 if (!indio_dev)
132 return -ENOMEM;
133 data = iio_priv(indio_dev);
134 i2c_set_clientdata(client, indio_dev);
135
136 data->cfg = &tpl0102_cfg[id->driver_data];
137 data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
138 if (IS_ERR(data->regmap)) {
139 dev_err(dev, "regmap initialization failed\n");
140 return PTR_ERR(data->regmap);
141 }
142
143 indio_dev->dev.parent = dev;
144 indio_dev->info = &tpl0102_info;
145 indio_dev->channels = tpl0102_channels;
146 indio_dev->num_channels = data->cfg->wipers;
147 indio_dev->name = client->name;
148
149 return devm_iio_device_register(dev, indio_dev);
150 }
151
152 static const struct i2c_device_id tpl0102_id[] = {
153 { "cat5140-503", CAT5140_503 },
154 { "cat5140-104", CAT5140_104 },
155 { "tpl0102-104", TPL0102_104 },
156 { "tpl0401-103", TPL0401_103 },
157 {}
158 };
159 MODULE_DEVICE_TABLE(i2c, tpl0102_id);
160
161 static struct i2c_driver tpl0102_driver = {
162 .driver = {
163 .name = "tpl0102",
164 },
165 .probe = tpl0102_probe,
166 .id_table = tpl0102_id,
167 };
168
169 module_i2c_driver(tpl0102_driver);
170
171 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
172 MODULE_DESCRIPTION("TPL0102 digital potentiometer");
173 MODULE_LICENSE("GPL");