summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/vcnl4000.c
blob: 16dacea9eadfa540afd57c7889339fc03384f639 (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
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
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
// SPDX-License-Identifier: GPL-2.0-only
/*
 * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4040/4200 combined ambient
 * light and proximity sensor
 *
 * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net>
 * Copyright 2019 Pursim SPC
 *
 * IIO driver for:
 *   VCNL4000/10/20 (7-bit I2C slave address 0x13)
 *   VCNL4040 (7-bit I2C slave address 0x60)
 *   VCNL4200 (7-bit I2C slave address 0x51)
 *
 * TODO:
 *   allow to adjust IR current
 *   proximity threshold and event handling
 *   periodic ALS/proximity measurement (VCNL4010/20)
 *   interrupts (VCNL4010/20/40, VCNL4200)
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define VCNL4000_DRV_NAME "vcnl4000"
#define VCNL4000_PROD_ID	0x01
#define VCNL4010_PROD_ID	0x02 /* for VCNL4020, VCNL4010 */
#define VCNL4040_PROD_ID	0x86
#define VCNL4200_PROD_ID	0x58

#define VCNL4000_COMMAND	0x80 /* Command register */
#define VCNL4000_PROD_REV	0x81 /* Product ID and Revision ID */
#define VCNL4000_LED_CURRENT	0x83 /* IR LED current for proximity mode */
#define VCNL4000_AL_PARAM	0x84 /* Ambient light parameter register */
#define VCNL4000_AL_RESULT_HI	0x85 /* Ambient light result register, MSB */
#define VCNL4000_AL_RESULT_LO	0x86 /* Ambient light result register, LSB */
#define VCNL4000_PS_RESULT_HI	0x87 /* Proximity result register, MSB */
#define VCNL4000_PS_RESULT_LO	0x88 /* Proximity result register, LSB */
#define VCNL4000_PS_MEAS_FREQ	0x89 /* Proximity test signal frequency */
#define VCNL4000_PS_MOD_ADJ	0x8a /* Proximity modulator timing adjustment */

#define VCNL4200_AL_CONF	0x00 /* Ambient light configuration */
#define VCNL4200_PS_CONF1	0x03 /* Proximity configuration */
#define VCNL4200_PS_DATA	0x08 /* Proximity data */
#define VCNL4200_AL_DATA	0x09 /* Ambient light data */
#define VCNL4200_DEV_ID		0x0e /* Device ID, slave address and version */

#define VCNL4040_DEV_ID		0x0c /* Device ID and version */

/* Bit masks for COMMAND register */
#define VCNL4000_AL_RDY		BIT(6) /* ALS data ready? */
#define VCNL4000_PS_RDY		BIT(5) /* proximity data ready? */
#define VCNL4000_AL_OD		BIT(4) /* start on-demand ALS measurement */
#define VCNL4000_PS_OD		BIT(3) /* start on-demand proximity measurement */

enum vcnl4000_device_ids {
	VCNL4000,
	VCNL4010,
	VCNL4040,
	VCNL4200,
};

struct vcnl4200_channel {
	u8 reg;
	ktime_t last_measurement;
	ktime_t sampling_rate;
	struct mutex lock;
};

struct vcnl4000_data {
	struct i2c_client *client;
	enum vcnl4000_device_ids id;
	int rev;
	int al_scale;
	const struct vcnl4000_chip_spec *chip_spec;
	struct mutex vcnl4000_lock;
	struct vcnl4200_channel vcnl4200_al;
	struct vcnl4200_channel vcnl4200_ps;
};

struct vcnl4000_chip_spec {
	const char *prod;
	int (*init)(struct vcnl4000_data *data);
	int (*measure_light)(struct vcnl4000_data *data, int *val);
	int (*measure_proximity)(struct vcnl4000_data *data, int *val);
};

static const struct i2c_device_id vcnl4000_id[] = {
	{ "vcnl4000", VCNL4000 },
	{ "vcnl4010", VCNL4010 },
	{ "vcnl4020", VCNL4010 },
	{ "vcnl4040", VCNL4040 },
	{ "vcnl4200", VCNL4200 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, vcnl4000_id);

static int vcnl4000_init(struct vcnl4000_data *data)
{
	int ret, prod_id;

	ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV);
	if (ret < 0)
		return ret;

	prod_id = ret >> 4;
	switch (prod_id) {
	case VCNL4000_PROD_ID:
		if (data->id != VCNL4000)
			dev_warn(&data->client->dev,
					"wrong device id, use vcnl4000");
		break;
	case VCNL4010_PROD_ID:
		if (data->id != VCNL4010)
			dev_warn(&data->client->dev,
					"wrong device id, use vcnl4010/4020");
		break;
	default:
		return -ENODEV;
	}

	data->rev = ret & 0xf;
	data->al_scale = 250000;
	mutex_init(&data->vcnl4000_lock);

	return 0;
};

static int vcnl4200_init(struct vcnl4000_data *data)
{
	int ret, id;

	ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID);
	if (ret < 0)
		return ret;

	id = ret & 0xff;

	if (id != VCNL4200_PROD_ID) {
		ret = i2c_smbus_read_word_data(data->client, VCNL4040_DEV_ID);
		if (ret < 0)
			return ret;

		id = ret & 0xff;

		if (id != VCNL4040_PROD_ID)
			return -ENODEV;
	}

	dev_dbg(&data->client->dev, "device id 0x%x", id);

	data->rev = (ret >> 8) & 0xf;

	/* Set defaults and enable both channels */
	ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, 0);
	if (ret < 0)
		return ret;
	ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, 0);
	if (ret < 0)
		return ret;

	data->al_scale = 24000;
	data->vcnl4200_al.reg = VCNL4200_AL_DATA;
	data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
	switch (id) {
	case VCNL4200_PROD_ID:
		/* Integration time is 50ms, but the experiments */
		/* show 54ms in total. */
		data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000);
		data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000);
		break;
	case VCNL4040_PROD_ID:
		/* Integration time is 80ms, add 10ms. */
		data->vcnl4200_al.sampling_rate = ktime_set(0, 100000 * 1000);
		data->vcnl4200_ps.sampling_rate = ktime_set(0, 100000 * 1000);
		break;
	}
	data->vcnl4200_al.last_measurement = ktime_set(0, 0);
	data->vcnl4200_ps.last_measurement = ktime_set(0, 0);
	mutex_init(&data->vcnl4200_al.lock);
	mutex_init(&data->vcnl4200_ps.lock);

	return 0;
};

static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
				u8 rdy_mask, u8 data_reg, int *val)
{
	int tries = 20;
	__be16 buf;
	int ret;

	mutex_lock(&data->vcnl4000_lock);

	ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
					req_mask);
	if (ret < 0)
		goto fail;

	/* wait for data to become ready */
	while (tries--) {
		ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND);
		if (ret < 0)
			goto fail;
		if (ret & rdy_mask)
			break;
		msleep(20); /* measurement takes up to 100 ms */
	}

	if (tries < 0) {
		dev_err(&data->client->dev,
			"vcnl4000_measure() failed, data not ready\n");
		ret = -EIO;
		goto fail;
	}

	ret = i2c_smbus_read_i2c_block_data(data->client,
		data_reg, sizeof(buf), (u8 *) &buf);
	if (ret < 0)
		goto fail;

	mutex_unlock(&data->vcnl4000_lock);
	*val = be16_to_cpu(buf);

	return 0;

fail:
	mutex_unlock(&data->vcnl4000_lock);
	return ret;
}

static int vcnl4200_measure(struct vcnl4000_data *data,
		struct vcnl4200_channel *chan, int *val)
{
	int ret;
	s64 delta;
	ktime_t next_measurement;

	mutex_lock(&chan->lock);

	next_measurement = ktime_add(chan->last_measurement,
			chan->sampling_rate);
	delta = ktime_us_delta(next_measurement, ktime_get());
	if (delta > 0)
		usleep_range(delta, delta + 500);
	chan->last_measurement = ktime_get();

	mutex_unlock(&chan->lock);

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

	*val = ret;

	return 0;
}

static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val)
{
	return vcnl4000_measure(data,
			VCNL4000_AL_OD, VCNL4000_AL_RDY,
			VCNL4000_AL_RESULT_HI, val);
}

static int vcnl4200_measure_light(struct vcnl4000_data *data, int *val)
{
	return vcnl4200_measure(data, &data->vcnl4200_al, val);
}

static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val)
{
	return vcnl4000_measure(data,
			VCNL4000_PS_OD, VCNL4000_PS_RDY,
			VCNL4000_PS_RESULT_HI, val);
}

static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val)
{
	return vcnl4200_measure(data, &data->vcnl4200_ps, val);
}

static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
	[VCNL4000] = {
		.prod = "VCNL4000",
		.init = vcnl4000_init,
		.measure_light = vcnl4000_measure_light,
		.measure_proximity = vcnl4000_measure_proximity,
	},
	[VCNL4010] = {
		.prod = "VCNL4010/4020",
		.init = vcnl4000_init,
		.measure_light = vcnl4000_measure_light,
		.measure_proximity = vcnl4000_measure_proximity,
	},
	[VCNL4040] = {
		.prod = "VCNL4040",
		.init = vcnl4200_init,
		.measure_light = vcnl4200_measure_light,
		.measure_proximity = vcnl4200_measure_proximity,
	},
	[VCNL4200] = {
		.prod = "VCNL4200",
		.init = vcnl4200_init,
		.measure_light = vcnl4200_measure_light,
		.measure_proximity = vcnl4200_measure_proximity,
	},
};

static const struct iio_chan_spec vcnl4000_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
	}, {
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	}
};

static int vcnl4000_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	int ret;
	struct vcnl4000_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_LIGHT:
			ret = data->chip_spec->measure_light(data, val);
			if (ret < 0)
				return ret;
			return IIO_VAL_INT;
		case IIO_PROXIMITY:
			ret = data->chip_spec->measure_proximity(data, val);
			if (ret < 0)
				return ret;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_SCALE:
		if (chan->type != IIO_LIGHT)
			return -EINVAL;

		*val = 0;
		*val2 = data->al_scale;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static const struct iio_info vcnl4000_info = {
	.read_raw = vcnl4000_read_raw,
};

static int vcnl4000_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct vcnl4000_data *data;
	struct iio_dev *indio_dev;
	int ret;

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

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	data->id = id->driver_data;
	data->chip_spec = &vcnl4000_chip_spec_cfg[data->id];

	ret = data->chip_spec->init(data);
	if (ret < 0)
		return ret;

	dev_dbg(&client->dev, "%s Ambient light/proximity sensor, Rev: %02x\n",
		data->chip_spec->prod, data->rev);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &vcnl4000_info;
	indio_dev->channels = vcnl4000_channels;
	indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels);
	indio_dev->name = VCNL4000_DRV_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;

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

static const struct of_device_id vcnl_4000_of_match[] = {
	{
		.compatible = "vishay,vcnl4000",
		.data = (void *)VCNL4000,
	},
	{
		.compatible = "vishay,vcnl4010",
		.data = (void *)VCNL4010,
	},
	{
		.compatible = "vishay,vcnl4020",
		.data = (void *)VCNL4010,
	},
	{
		.compatible = "vishay,vcnl4040",
		.data = (void *)VCNL4040,
	},
	{
		.compatible = "vishay,vcnl4200",
		.data = (void *)VCNL4200,
	},
	{},
};
MODULE_DEVICE_TABLE(of, vcnl_4000_of_match);

static struct i2c_driver vcnl4000_driver = {
	.driver = {
		.name   = VCNL4000_DRV_NAME,
		.of_match_table = vcnl_4000_of_match,
	},
	.probe  = vcnl4000_probe,
	.id_table = vcnl4000_id,
};

module_i2c_driver(vcnl4000_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL");