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
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* isl29125.c - Support for Intersil ISL29125 RGB light sensor
*
* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
*
* RGB light sensor with 16-bit channels for red, green, blue);
* 7-bit I2C slave address 0x44
*
* TODO: interrupt support, IR compensation, thresholds, 12bit
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#define ISL29125_DRV_NAME "isl29125"
#define ISL29125_DEVICE_ID 0x00
#define ISL29125_CONF1 0x01
#define ISL29125_CONF2 0x02
#define ISL29125_CONF3 0x03
#define ISL29125_STATUS 0x08
#define ISL29125_GREEN_DATA 0x09
#define ISL29125_RED_DATA 0x0b
#define ISL29125_BLUE_DATA 0x0d
#define ISL29125_ID 0x7d
#define ISL29125_MODE_MASK GENMASK(2, 0)
#define ISL29125_MODE_PD 0x0
#define ISL29125_MODE_G 0x1
#define ISL29125_MODE_R 0x2
#define ISL29125_MODE_B 0x3
#define ISL29125_MODE_RGB 0x5
#define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */
#define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */
#define ISL29125_MODE_RANGE BIT(3)
#define ISL29125_STATUS_CONV BIT(1)
struct isl29125_data {
struct i2c_client *client;
u8 conf1;
u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
};
#define ISL29125_CHANNEL(_color, _si) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.channel2 = IIO_MOD_LIGHT_##_color, \
.scan_index = _si, \
.scan_type = { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_CPU, \
}, \
}
static const struct iio_chan_spec isl29125_channels[] = {
ISL29125_CHANNEL(GREEN, 0),
ISL29125_CHANNEL(RED, 1),
ISL29125_CHANNEL(BLUE, 2),
IIO_CHAN_SOFT_TIMESTAMP(3),
};
static const struct {
u8 mode, data;
} isl29125_regs[] = {
{ISL29125_MODE_G, ISL29125_GREEN_DATA},
{ISL29125_MODE_R, ISL29125_RED_DATA},
{ISL29125_MODE_B, ISL29125_BLUE_DATA},
};
static int isl29125_read_data(struct isl29125_data *data, int si)
{
int tries = 5;
int ret;
ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
data->conf1 | isl29125_regs[si].mode);
if (ret < 0)
return ret;
msleep(101);
while (tries--) {
ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
if (ret < 0)
goto fail;
if (ret & ISL29125_STATUS_CONV)
break;
msleep(20);
}
if (tries < 0) {
dev_err(&data->client->dev, "data not ready\n");
ret = -EIO;
goto fail;
}
ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
fail:
i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
return ret;
}
static int isl29125_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct isl29125_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = isl29125_read_data(data, chan->scan_index);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
if (data->conf1 & ISL29125_MODE_RANGE)
*val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/
else
*val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int isl29125_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct isl29125_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SCALE:
if (val != 0)
return -EINVAL;
if (val2 == ISL29125_SENSING_RANGE_1)
data->conf1 |= ISL29125_MODE_RANGE;
else if (val2 == ISL29125_SENSING_RANGE_0)
data->conf1 &= ~ISL29125_MODE_RANGE;
else
return -EINVAL;
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
data->conf1);
default:
return -EINVAL;
}
}
static irqreturn_t isl29125_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct isl29125_data *data = iio_priv(indio_dev);
int i, j = 0;
for_each_set_bit(i, indio_dev->active_scan_mask,
indio_dev->masklength) {
int ret = i2c_smbus_read_word_data(data->client,
isl29125_regs[i].data);
if (ret < 0)
goto done;
data->buffer[j++] = ret;
}
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
iio_get_time_ns(indio_dev));
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");
static struct attribute *isl29125_attributes[] = {
&iio_const_attr_scale_available.dev_attr.attr,
NULL
};
static const struct attribute_group isl29125_attribute_group = {
.attrs = isl29125_attributes,
};
static const struct iio_info isl29125_info = {
.read_raw = isl29125_read_raw,
.write_raw = isl29125_write_raw,
.attrs = &isl29125_attribute_group,
};
static int isl29125_buffer_postenable(struct iio_dev *indio_dev)
{
struct isl29125_data *data = iio_priv(indio_dev);
int err;
err = iio_triggered_buffer_postenable(indio_dev);
if (err)
return err;
data->conf1 |= ISL29125_MODE_RGB;
err = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
data->conf1);
if (err) {
iio_triggered_buffer_predisable(indio_dev);
return err;
}
return 0;
}
static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
{
struct isl29125_data *data = iio_priv(indio_dev);
int ret;
data->conf1 &= ~ISL29125_MODE_MASK;
data->conf1 |= ISL29125_MODE_PD;
ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
data->conf1);
iio_triggered_buffer_predisable(indio_dev);
return ret;
}
static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
.postenable = isl29125_buffer_postenable,
.predisable = isl29125_buffer_predisable,
};
static int isl29125_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct isl29125_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (indio_dev == NULL)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
indio_dev->dev.parent = &client->dev;
indio_dev->info = &isl29125_info;
indio_dev->name = ISL29125_DRV_NAME;
indio_dev->channels = isl29125_channels;
indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
if (ret < 0)
return ret;
if (ret != ISL29125_ID)
return -ENODEV;
data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
data->conf1);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
if (ret < 0)
return ret;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
isl29125_trigger_handler, &isl29125_buffer_setup_ops);
if (ret < 0)
return ret;
ret = iio_device_register(indio_dev
|