summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/adjd_s311.c
blob: 5fd775a20176dbc3debffd1e9b9f0538869c684e (plain)
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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
 *
 * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
 * red, green, blue, clear); 7-bit I2C slave address 0x74
 *
 * limitations: no calibration, no offset mode, no sleep mode
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
#include <linux/err.h>
#include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"

#define ADJD_S311_CTRL		0x00
#define ADJD_S311_CONFIG	0x01
#define ADJD_S311_CAP_RED	0x06
#define ADJD_S311_CAP_GREEN	0x07
#define ADJD_S311_CAP_BLUE	0x08
#define ADJD_S311_CAP_CLEAR	0x09
#define ADJD_S311_INT_RED	0x0a
#define ADJD_S311_INT_GREEN	0x0c
#define ADJD_S311_INT_BLUE	0x0e
#define ADJD_S311_INT_CLEAR	0x10
#define ADJD_S311_DATA_RED	0x40
#define ADJD_S311_DATA_GREEN	0x42
#define ADJD_S311_DATA_BLUE	0x44
#define ADJD_S311_DATA_CLEAR	0x46
#define ADJD_S311_OFFSET_RED	0x48
#define ADJD_S311_OFFSET_GREEN	0x49
#define ADJD_S311_OFFSET_BLUE	0x4a
#define ADJD_S311_OFFSET_CLEAR	0x4b

#define ADJD_S311_CTRL_GOFS	0x02
#define ADJD_S311_CTRL_GSSR	0x01
#define ADJD_S311_CAP_MASK	0x0f
#define ADJD_S311_INT_MASK	0x0fff
#define ADJD_S311_DATA_MASK	0x03ff

struct adjd_s311_data {
	struct i2c_client *client;
	struct {
		s16 chans[4];
		s64 ts __aligned(8);
	} scan;
};

enum adjd_s311_channel_idx {
	IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
};

#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2)
#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2)
#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))

static int adjd_s311_req_data(struct iio_dev *indio_dev)
{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	int tries = 10;

	int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
		ADJD_S311_CTRL_GSSR);
	if (ret < 0)
		return ret;

	while (tries--) {
		ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
		if (ret < 0)
			return ret;
		if (!(ret & ADJD_S311_CTRL_GSSR))
			break;
		msleep(20);
	}

	if (tries < 0) {
		dev_err(&data->client->dev,
			"adjd_s311_req_data() failed, data not ready\n");
		return -EIO;
	}

	return 0;
}

static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
{
	struct adjd_s311_data *data = iio_priv(indio_dev);

	int ret = adjd_s311_req_data(indio_dev);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_word_data(data->client, reg);
	if (ret < 0)
		return ret;

	*val = ret & ADJD_S311_DATA_MASK;

	return 0;
}

static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adjd_s311_data *data = iio_priv(indio_dev);
	s64 time_ns = iio_get_time_ns(indio_dev);
	int i, j = 0;

	int ret = adjd_s311_req_data(indio_dev);
	if (ret < 0)
		goto done;

	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		ret = i2c_smbus_read_word_data(data->client,
			ADJD_S311_DATA_REG(i));
		if (ret < 0)
			goto done;

		data->scan.chans[j++] = ret & ADJD_S311_DATA_MASK;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, time_ns);

done:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
	.type = IIO_INTENSITY, \
	.modified = 1, \
	.address = (IDX_##_color), \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
		BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
		BIT(IIO_CHAN_INFO_INT_TIME), \
	.channel2 = (IIO_MOD_LIGHT_##_color), \
	.scan_index = (_scan_idx), \
	.scan_type = { \
		.sign = 'u', \
		.realbits = 10, \
		.storagebits = 16, \
		.endianness = IIO_CPU, \
	}, \
}

static const struct iio_chan_spec adjd_s311_channels[] = {
	ADJD_S311_CHANNEL(RED, 0),
	ADJD_S311_CHANNEL(GREEN, 1),
	ADJD_S311_CHANNEL(BLUE, 2),
	ADJD_S311_CHANNEL(CLEAR, 3),
	IIO_CHAN_SOFT_TIMESTAMP(4),
};

static int adjd_s311_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2, long mask)
{
	struct adjd_s311_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = adjd_s311_read_data(indio_dev,
			ADJD_S311_DATA_REG(chan->address), val);
		if (ret < 0)
			return ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_HARDWAREGAIN:
		ret = i2c_smbus_read_byte_data(data->client,
			ADJD_S311_CAP_REG(chan->address));
		if (ret < 0)
			return ret;
		*val = ret & ADJD_S311_CAP_MASK;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		ret = i2c_smbus_read_word_data(data->client,
			ADJD_S311_INT_REG(chan->address));
		if (ret < 0)
			return ret;
		*val = 0;
		/*
		 * not documented, based on measurement:
		 * 4095 LSBs correspond to roughly 4 ms
		 */
		*val2 = ret & ADJD_S311_INT_MASK;
		return IIO_VAL_INT_PLUS_MICRO;
	}
	return -EINVAL;
}

static int adjd_s311_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val, int val2, long mask)
{
	struct adjd_s311_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_HARDWAREGAIN:
		if (val < 0 || val > ADJD_S311_CAP_MASK)
			return -EINVAL;

		return i2c_smbus_write_byte_data(data->client,
			ADJD_S311_CAP_REG(chan->address), val);
	case IIO_CHAN_INFO_INT_TIME:
		if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK)
			return -EINVAL;

		return i2c_smbus_write_word_data(data->client,
			ADJD_S311_INT_REG(chan->address), val2);
	}
	return -EINVAL;
}

static const struct iio_info adjd_s311_info = {
	.read_raw = adjd_s311_read_raw,
	.write_raw = adjd_s311_write_raw,
};

static int adjd_s311_probe(struct i2c_client *client)
{
	struct adjd_s311_data *data;
	struct iio_dev *indio_dev;
	int err;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (indio_dev == NULL)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	data->client = client;

	indio_dev->info = &adjd_s311_info;
	indio_dev->name = ADJD_S311_DRV_NAME;
	indio_dev->channels = adjd_s311_channels;
	indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	err = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
					      adjd_s311_trigger_handler, NULL);
	if (err < 0)
		return err;

	return devm_iio_device_register(&client->dev, indio_dev);
}

static const struct i2c_device_id adjd_s311_id[] = {
	{ "adjd_s311", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adjd_s311_id);

static struct i2c_driver adjd_s311_driver = {
	.driver = {
		.name	= ADJD_S311_DRV_NAME,
	},
	.probe		= adjd_s311_probe,
	.id_table	= adjd_s311_id,
};
module_i2c_driver(adjd_s311_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("ADJD-S311 color sensor");
MODULE_LICENSE("GPL");