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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Support for ON Semiconductor NOA1305 ambient light sensor
*
* Copyright (C) 2016 Emcraft Systems
* Copyright (C) 2019 Collabora Ltd.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#define NOA1305_REG_POWER_CONTROL 0x0
#define NOA1305_POWER_CONTROL_DOWN 0x00
#define NOA1305_POWER_CONTROL_ON 0x08
#define NOA1305_REG_RESET 0x1
#define NOA1305_RESET_RESET 0x10
#define NOA1305_REG_INTEGRATION_TIME 0x2
#define NOA1305_INTEGR_TIME_800MS 0x00
#define NOA1305_INTEGR_TIME_400MS 0x01
#define NOA1305_INTEGR_TIME_200MS 0x02
#define NOA1305_INTEGR_TIME_100MS 0x03
#define NOA1305_INTEGR_TIME_50MS 0x04
#define NOA1305_INTEGR_TIME_25MS 0x05
#define NOA1305_INTEGR_TIME_12_5MS 0x06
#define NOA1305_INTEGR_TIME_6_25MS 0x07
#define NOA1305_REG_INT_SELECT 0x3
#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
#define NOA1305_INT_SEL_ACTIVE_LOW 0x02
#define NOA1305_INT_SEL_INACTIVE 0x03
#define NOA1305_REG_INT_THRESH_LSB 0x4
#define NOA1305_REG_INT_THRESH_MSB 0x5
#define NOA1305_REG_ALS_DATA_LSB 0x6
#define NOA1305_REG_ALS_DATA_MSB 0x7
#define NOA1305_REG_DEVICE_ID_LSB 0x8
#define NOA1305_REG_DEVICE_ID_MSB 0x9
#define NOA1305_DEVICE_ID 0x0519
#define NOA1305_DRIVER_NAME "noa1305"
struct noa1305_priv {
struct i2c_client *client;
struct regmap *regmap;
struct regulator *vin_reg;
};
static int noa1305_measure(struct noa1305_priv *priv)
{
__le16 data;
int ret;
ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
2);
if (ret < 0)
return ret;
return le16_to_cpu(data);
}
static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
{
int data;
int ret;
ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
if (ret < 0)
return ret;
/*
* Lux = count / (<Integration Constant> * <Integration Time>)
*
* Integration Constant = 7.7
* Integration Time in Seconds
*/
switch (data) {
case NOA1305_INTEGR_TIME_800MS:
*val = 100;
*val2 = 77 * 8;
break;
case NOA1305_INTEGR_TIME_400MS:
*val = 100;
*val2 = 77 * 4;
break;
case NOA1305_INTEGR_TIME_200MS:
*val = 100;
*val2 = 77 * 2;
break;
case NOA1305_INTEGR_TIME_100MS:
*val = 100;
*val2 = 77;
break;
case NOA1305_INTEGR_TIME_50MS:
*val = 1000;
*val2 = 77 * 5;
break;
case NOA1305_INTEGR_TIME_25MS:
*val = 10000;
*val2 = 77 * 25;
break;
case NOA1305_INTEGR_TIME_12_5MS:
*val = 100000;
*val2 = 77 * 125;
break;
case NOA1305_INTEGR_TIME_6_25MS:
*val = 1000000;
*val2 = 77 * 625;
break;
default:
return -EINVAL;
}
return IIO_VAL_FRACTIONAL;
}
static const struct iio_chan_spec noa1305_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
}
};
static int noa1305_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
int ret = -EINVAL;
struct noa1305_priv *priv = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_LIGHT:
ret = noa1305_measure(priv);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
default:
break;
}
break;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_LIGHT:
return noa1305_scale(priv, val, val2);
default:
break;
}
break;
default:
break;
}
return ret;
}
static const struct iio_info noa1305_info = {
.read_raw = noa1305_read_raw,
};
static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case NOA1305_REG_POWER_CONTROL:
case NOA1305_REG_RESET:
case NOA1305_REG_INTEGRATION_TIME:
case NOA1305_REG_INT_SELECT:
case NOA1305_REG_INT_THRESH_LSB:
case NOA1305_REG_INT_THRESH_MSB:
return true;
default:
return false;
}
}
static const struct regmap_config noa1305_regmap_config = {
.name = NOA1305_DRIVER_NAME,
.reg_bits = 8,
.val_bits = 8,
.max_register = NOA1305_REG_DEVICE_ID_MSB,
.writeable_reg = noa1305_writable_reg,
};
static void noa1305_reg_remove(void *data)
{
struct noa1305_priv *priv = data;
regulator_disable(priv->vin_reg);
}
static int noa1305_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct noa1305_priv *priv;
struct iio_dev *indio_dev;
struct regmap *regmap;
__le16 data;
unsigned int dev_id;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Regmap initialization failed.\n");
return PTR_ERR(regmap);
}
priv = iio_priv(indio_dev);
priv->vin_reg = devm_regulator_get(&client->dev, "vin");
if (IS_ERR(priv->vin_reg)) {
dev_err(&client->dev, "get regulator vin failed\n");
return PTR_ERR(priv->vin_reg);
}
ret = regulator_enable(priv->vin_reg);
if (ret) {
dev_err(&client->dev, "enable regulator vin failed\n");
return ret;
}
ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv);
if (ret) {
dev_err(&client->dev, "addition of devm action failed\n");
return ret;
}
i2c_set_clientdata(client, indio_dev);
priv->client = client;
priv->regmap = regmap;
ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
if (ret < 0) {
dev_err(&client->dev, "ID reading failed: %d\n", ret);
return ret;
}
dev_id = le16_to_cpu(data);
if (dev_id != NOA1305_DEVICE_ID) {
dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
return -ENODEV;
}
ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
NOA1305_POWER_CONTROL_ON);
if (ret < 0) {
dev_err(&client->dev, "Enabling power control failed\n");
return ret;
}
ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
if (ret < 0) {
dev_err(&client->dev, "Device reset failed\n");
return ret;
}
ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
NOA1305_INTEGR_TIME_800MS);
if (ret < 0) {
dev_err(&client->dev, "Setting integration time failed\n");
return ret;
}
indio_dev->dev.parent = &client->dev;
indio_dev->info = &noa1305_info;
indio_dev->channels = noa1305_channels;
indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
indio_dev->name = NOA1305_DRIVER_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = devm_iio_device_register(&client->dev, indio_dev);
if (ret)
dev_err(&client->dev, "registering device failed\n");
return ret;
}
static const struct of_device_id noa1305_of_match[] = {
{ .compatible = "onnn,noa1305" },
{ }
};
MODULE_DEVICE_TABLE(of, noa1305_of_match);
static const struct i2c_device_id noa1305_ids[] = {
{ "noa1305", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, noa1305_ids);
static struct i2c_driver noa1305_driver = {
.driver = {
.name = NOA1305_DRIVER_NAME,
.of_match_table = noa1305_of_match,
|