summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/pa12203001.c
blob: 76a9e12b46bc45e50896b2abfb1513b577560667 (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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 * To do: Interrupt support.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>

#define PA12203001_DRIVER_NAME	"pa12203001"

#define PA12203001_REG_CFG0		0x00
#define PA12203001_REG_CFG1		0x01
#define PA12203001_REG_CFG2		0x02
#define PA12203001_REG_CFG3		0x03

#define PA12203001_REG_ADL		0x0b
#define PA12203001_REG_PDH		0x0e

#define PA12203001_REG_POFS		0x10
#define PA12203001_REG_PSET		0x11

#define PA12203001_ALS_EN_MASK		BIT(0)
#define PA12203001_PX_EN_MASK		BIT(1)
#define PA12203001_PX_NORMAL_MODE_MASK		GENMASK(7, 6)
#define PA12203001_AFSR_MASK		GENMASK(5, 4)
#define PA12203001_AFSR_SHIFT		4

#define PA12203001_PSCAN			0x03

/* als range 31000, ps, als disabled */
#define PA12203001_REG_CFG0_DEFAULT		0x30

/* led current: 100 mA */
#define PA12203001_REG_CFG1_DEFAULT		0x20

/* ps mode: normal, interrupts not active */
#define PA12203001_REG_CFG2_DEFAULT		0xcc

#define PA12203001_REG_CFG3_DEFAULT		0x00

#define PA12203001_SLEEP_DELAY_MS		3000

#define PA12203001_CHIP_ENABLE		0xff
#define PA12203001_CHIP_DISABLE		0x00

/* available scales: corresponding to [500, 4000, 7000, 31000]  lux */
static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};

struct pa12203001_data {
	struct i2c_client *client;

	/* protect device states */
	struct mutex lock;

	bool als_enabled;
	bool px_enabled;
	bool als_needs_enable;
	bool px_needs_enable;

	struct regmap *map;
};

static const struct {
	u8 reg;
	u8 val;
} regvals[] = {
	{PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
	{PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
	{PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
	{PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
	{PA12203001_REG_PSET, PA12203001_PSCAN},
};

static IIO_CONST_ATTR(in_illuminance_scale_available,
		      "0.007629 0.061036 0.106813 0.473029");

static struct attribute *pa12203001_attrs[] = {
	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	NULL
};

static const struct attribute_group pa12203001_attr_group = {
	.attrs = pa12203001_attrs,
};

static const struct iio_chan_spec pa12203001_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 const struct regmap_range pa12203001_volatile_regs_ranges[] = {
	regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
	regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
};

static const struct regmap_access_table pa12203001_volatile_regs = {
	.yes_ranges = pa12203001_volatile_regs_ranges,
	.n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
};

static const struct regmap_config pa12203001_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = PA12203001_REG_PSET,
	.cache_type = REGCACHE_RBTREE,
	.volatile_table = &pa12203001_volatile_regs,
};

static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
{
	int ret;

	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
				 PA12203001_ALS_EN_MASK, enable);
	if (ret < 0)
		return ret;

	data->als_enabled = !!enable;

	return 0;
}

static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
{
	int ret;

	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
				 PA12203001_PX_EN_MASK, enable);
	if (ret < 0)
		return ret;

	data->px_enabled = !!enable;

	return 0;
}

static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
				      u8 mask)
{
#ifdef CONFIG_PM
	int ret;

	if (on && (mask & PA12203001_ALS_EN_MASK)) {
		mutex_lock(&data->lock);
		if (data->px_enabled) {
			ret = pa12203001_als_enable(data,
						    PA12203001_ALS_EN_MASK);
			if (ret < 0)
				goto err;
		} else {
			data->als_needs_enable = true;
		}
		mutex_unlock(&data->lock);
	}

	if (on && (mask & PA12203001_PX_EN_MASK)) {
		mutex_lock(&data->lock);
		if (data->als_enabled) {
			ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
			if (ret < 0)
				goto err;
		} else {
			data->px_needs_enable = true;
		}
		mutex_unlock(&data->lock);
	}

	if (on) {
		ret = pm_runtime_get_sync(&data->client->dev);
		if (ret < 0)
			pm_runtime_put_noidle(&data->client->dev);

	} else {
		pm_runtime_mark_last_busy(&data->client->dev);
		ret = pm_runtime_put_autosuspend(&data->client->dev);
	}

	return ret;

err:
	mutex_unlock(&data->lock);
	return ret;

#endif
	return 0;
}

static int pa12203001_read_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan, int *val,
			       int *val2, long mask)
{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int ret;
	u8 dev_mask;
	unsigned int reg_byte;
	__le16 reg_word;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_LIGHT:
			dev_mask = PA12203001_ALS_EN_MASK;
			ret = pa12203001_set_power_state(data, true, dev_mask);
			if (ret < 0)
				return ret;
			/*
			 * ALS ADC value is stored in registers
			 * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
			 */
			ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
					       &reg_word, 2);
			if (ret < 0)
				goto reg_err;

			*val = le16_to_cpu(reg_word);
			ret = pa12203001_set_power_state(data, false, dev_mask);
			if (ret < 0)
				return ret;
			break;
		case IIO_PROXIMITY:
			dev_mask = PA12203001_PX_EN_MASK;
			ret = pa12203001_set_power_state(data, true, dev_mask);
			if (ret < 0)
				return ret;
			ret = regmap_read(data->map, PA12203001_REG_PDH,
					  &reg_byte);
			if (ret < 0)
				goto reg_err;

			*val = reg_byte;
			ret = pa12203001_set_power_state(data, false, dev_mask);
			if (ret < 0)
				return ret;
			break;
		default:
			return -EINVAL;
		}
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
		if (ret < 0)
			return ret;
		*val = 0;
		reg_byte = (reg_byte & PA12203001_AFSR_MASK);
		*val2 = pa12203001_scales[reg_byte >> 4];
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}

reg_err:
	pa12203001_set_power_state(data, false, dev_mask);
	return ret;
}

static int pa12203001_write_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan, int val,
				int val2, long mask)
{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int i, ret, new_val;
	unsigned int reg_byte;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
		if (val != 0 || ret < 0)
			return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
			if (val2 == pa12203001_scales[i]) {
				new_val = i << PA12203001_AFSR_SHIFT;
				return regmap_update_bits(data->map,
							  PA12203001_REG_CFG0,
							  PA12203001_AFSR_MASK,
							  new_val);
			}
		}
		break;
	default:
		break;
	}

	return -EINVAL;
}

static const struct iio_info pa12203001_info = {
	.driver_module	= THIS_MODULE,
	.read_raw = pa12203001_read_raw,
	.write_raw = pa12203001_write_raw,
	.attrs = &pa12203001_attr_group,
};

static int pa12203001_init(struct iio_dev *indio_dev)
{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(regvals); i++) {
		ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->lock);
	ret = pa12203001_als_enable(data, state);
	if (ret < 0)
		goto out;

	ret = pa12203001_px_enable(data, state);

out:
	mutex_unlock(&data->lock);
	return ret;
}

static int pa12203001_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct pa12203001_data *data;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev,
					  sizeof(struct pa12203001_data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
	if (IS_ERR(data->map))
		return PTR_ERR(data->map);

	mutex_init(&data->lock);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &pa12203001_info;
	indio_dev->name = PA12203001_DRIVER_NAME;
	indio_dev->channels = pa12203001_channels;
	indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = pa12203001_init(indio_dev);
	if (ret < 0)
		return ret;

	ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
	if (ret < 0)
		return ret;

	ret = pm_runtime_set_active(&client->dev);
	if (ret < 0)
		goto out_err;

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev,
					 PA12203001_SLEEP_DELAY_MS);
	pm_runtime_use_autosuspend(&client->dev);

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		goto out_err;

	return 0;

out_err:
	pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
	return ret;
}

static int pa12203001_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
}

#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
static int pa12203001_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
}
#endif

#ifdef CONFIG_PM_SLEEP
static int pa12203001_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
}
#endif

#ifdef CONFIG_PM
static int pa12203001_runtime_resume(struct device *dev)
{
	struct pa12203001_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	mutex_lock(&data->lock);
	if (data->als_needs_enable) {
		pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
		data->als_needs_enable = false;
	}
	if (data->px_needs_enable) {
		pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
		data->px_needs_enable = false;
	}
	mutex_unlock(&data->lock);

	return 0;
}
#endif

static const struct dev_pm_ops pa12203001_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
	SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
};

static const struct acpi_device_id pa12203001_acpi_match[] = {
	{ "TXCPA122", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);

static const struct i2c_device_id pa12203001_id[] = {
		{"txcpa122", 0},
		{}
};

MODULE_DEVICE_TABLE(i2c, pa12203001_id);

static struct i2c_driver pa12203001_driver = {
	.driver = {
		.name = PA12203001_DRIVER_NAME,
		.pm = &pa12203001_pm_ops,
		.acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
	},
	.probe = pa12203001_probe,
	.remove = pa12203001_remove,
	.id_table = pa12203001_id,

};
module_i2c_driver(pa12203001_driver);

MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud