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17#include <linux/bitfield.h>
18#include <linux/i2c.h>
19#include <linux/module.h>
20#include <linux/of.h>
21
22#include <linux/iio/iio.h>
23#include <linux/iio/sysfs.h>
24
25#define AL3010_DRV_NAME "al3010"
26
27#define AL3010_REG_SYSTEM 0x00
28#define AL3010_REG_DATA_LOW 0x0c
29#define AL3010_REG_CONFIG 0x10
30
31#define AL3010_CONFIG_DISABLE 0x00
32#define AL3010_CONFIG_ENABLE 0x01
33
34#define AL3010_GAIN_MASK GENMASK(6,4)
35
36#define AL3010_SCALE_AVAILABLE "1.1872 0.2968 0.0742 0.018"
37
38enum al3xxxx_range {
39 AL3XXX_RANGE_1,
40 AL3XXX_RANGE_2,
41 AL3XXX_RANGE_3,
42 AL3XXX_RANGE_4
43};
44
45static const int al3010_scales[][2] = {
46 {0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
47};
48
49struct al3010_data {
50 struct i2c_client *client;
51};
52
53static const struct iio_chan_spec al3010_channels[] = {
54 {
55 .type = IIO_LIGHT,
56 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
57 BIT(IIO_CHAN_INFO_SCALE),
58 }
59};
60
61static IIO_CONST_ATTR(in_illuminance_scale_available, AL3010_SCALE_AVAILABLE);
62
63static struct attribute *al3010_attributes[] = {
64 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
65 NULL,
66};
67
68static const struct attribute_group al3010_attribute_group = {
69 .attrs = al3010_attributes,
70};
71
72static int al3010_set_pwr(struct i2c_client *client, bool pwr)
73{
74 u8 val = pwr ? AL3010_CONFIG_ENABLE : AL3010_CONFIG_DISABLE;
75 return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, val);
76}
77
78static void al3010_set_pwr_off(void *_data)
79{
80 struct al3010_data *data = _data;
81
82 al3010_set_pwr(data->client, false);
83}
84
85static int al3010_init(struct al3010_data *data)
86{
87 int ret;
88
89 ret = al3010_set_pwr(data->client, true);
90
91 if (ret < 0)
92 return ret;
93
94 ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG,
95 FIELD_PREP(AL3010_GAIN_MASK,
96 AL3XXX_RANGE_3));
97 if (ret < 0)
98 return ret;
99
100 return 0;
101}
102
103static int al3010_read_raw(struct iio_dev *indio_dev,
104 struct iio_chan_spec const *chan, int *val,
105 int *val2, long mask)
106{
107 struct al3010_data *data = iio_priv(indio_dev);
108 int ret;
109
110 switch (mask) {
111 case IIO_CHAN_INFO_RAW:
112
113
114
115
116
117 ret = i2c_smbus_read_word_data(data->client,
118 AL3010_REG_DATA_LOW);
119 if (ret < 0)
120 return ret;
121 *val = ret;
122 return IIO_VAL_INT;
123 case IIO_CHAN_INFO_SCALE:
124 ret = i2c_smbus_read_byte_data(data->client,
125 AL3010_REG_CONFIG);
126 if (ret < 0)
127 return ret;
128
129 ret = FIELD_GET(AL3010_GAIN_MASK, ret);
130 *val = al3010_scales[ret][0];
131 *val2 = al3010_scales[ret][1];
132
133 return IIO_VAL_INT_PLUS_MICRO;
134 }
135 return -EINVAL;
136}
137
138static int al3010_write_raw(struct iio_dev *indio_dev,
139 struct iio_chan_spec const *chan, int val,
140 int val2, long mask)
141{
142 struct al3010_data *data = iio_priv(indio_dev);
143 int i;
144
145 switch (mask) {
146 case IIO_CHAN_INFO_SCALE:
147 for (i = 0; i < ARRAY_SIZE(al3010_scales); i++) {
148 if (val != al3010_scales[i][0] ||
149 val2 != al3010_scales[i][1])
150 continue;
151
152 return i2c_smbus_write_byte_data(data->client,
153 AL3010_REG_CONFIG,
154 FIELD_PREP(AL3010_GAIN_MASK, i));
155 }
156 break;
157 }
158 return -EINVAL;
159}
160
161static const struct iio_info al3010_info = {
162 .read_raw = al3010_read_raw,
163 .write_raw = al3010_write_raw,
164 .attrs = &al3010_attribute_group,
165};
166
167static int al3010_probe(struct i2c_client *client,
168 const struct i2c_device_id *id)
169{
170 struct al3010_data *data;
171 struct iio_dev *indio_dev;
172 int ret;
173
174 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
175 if (!indio_dev)
176 return -ENOMEM;
177
178 data = iio_priv(indio_dev);
179 i2c_set_clientdata(client, indio_dev);
180 data->client = client;
181
182 indio_dev->info = &al3010_info;
183 indio_dev->name = AL3010_DRV_NAME;
184 indio_dev->channels = al3010_channels;
185 indio_dev->num_channels = ARRAY_SIZE(al3010_channels);
186 indio_dev->modes = INDIO_DIRECT_MODE;
187
188 ret = al3010_init(data);
189 if (ret < 0) {
190 dev_err(&client->dev, "al3010 chip init failed\n");
191 return ret;
192 }
193
194 ret = devm_add_action_or_reset(&client->dev,
195 al3010_set_pwr_off,
196 data);
197 if (ret < 0)
198 return ret;
199
200 return devm_iio_device_register(&client->dev, indio_dev);
201}
202
203static int __maybe_unused al3010_suspend(struct device *dev)
204{
205 return al3010_set_pwr(to_i2c_client(dev), false);
206}
207
208static int __maybe_unused al3010_resume(struct device *dev)
209{
210 return al3010_set_pwr(to_i2c_client(dev), true);
211}
212
213static SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume);
214
215static const struct i2c_device_id al3010_id[] = {
216 {"al3010", },
217 {}
218};
219MODULE_DEVICE_TABLE(i2c, al3010_id);
220
221static const struct of_device_id al3010_of_match[] = {
222 { .compatible = "dynaimage,al3010", },
223 {},
224};
225MODULE_DEVICE_TABLE(of, al3010_of_match);
226
227static struct i2c_driver al3010_driver = {
228 .driver = {
229 .name = AL3010_DRV_NAME,
230 .of_match_table = al3010_of_match,
231 .pm = &al3010_pm_ops,
232 },
233 .probe = al3010_probe,
234 .id_table = al3010_id,
235};
236module_i2c_driver(al3010_driver);
237
238MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
239MODULE_AUTHOR("David Heidelberg <david@ixit.cz>");
240MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
241MODULE_LICENSE("GPL v2");
242
