summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/tsl4531.c
blob: cf94ec72b181fb756e32502b5c83059c1f9388b4 (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
/*
 * tsl4531.c - Support for TAOS TSL4531 ambient light sensor
 *
 * Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for the TSL4531x family
 *   TSL45311/TSL45313: 7-bit I2C slave address 0x39
 *   TSL45315/TSL45317: 7-bit I2C slave address 0x29
 *
 * TODO: single cycle measurement
 */

#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 TSL4531_DRV_NAME "tsl4531"

#define TSL4531_COMMAND BIT(7)

#define TSL4531_CONTROL (TSL4531_COMMAND | 0x00)
#define TSL4531_CONFIG (TSL4531_COMMAND | 0x01)
#define TSL4531_DATA (TSL4531_COMMAND | 0x04)
#define TSL4531_ID (TSL4531_COMMAND | 0x0a)

/* operating modes in control register */
#define TSL4531_MODE_POWERDOWN 0x00
#define TSL4531_MODE_SINGLE_ADC 0x02
#define TSL4531_MODE_NORMAL 0x03

/* integration time control in config register */
#define TSL4531_TCNTRL_400MS 0x00
#define TSL4531_TCNTRL_200MS 0x01
#define TSL4531_TCNTRL_100MS 0x02

/* part number in id register */
#define TSL45311_ID 0x8
#define TSL45313_ID 0x9
#define TSL45315_ID 0xa
#define TSL45317_ID 0xb
#define TSL4531_ID_SHIFT 4

struct tsl4531_data {
	struct i2c_client *client;
	struct mutex lock;
	int int_time;
};

static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");

static struct attribute *tsl4531_attributes[] = {
	&iio_const_attr_integration_time_available.dev_attr.attr,
	NULL
};

static const struct attribute_group tsl4531_attribute_group = {
	.attrs = tsl4531_attributes,
};

static const struct iio_chan_spec tsl4531_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME)
	}
};

static int tsl4531_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	struct tsl4531_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = i2c_smbus_read_word_data(data->client,
			TSL4531_DATA);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		/* 0.. 1x, 1 .. 2x, 2 .. 4x */
		*val = 1 << data->int_time;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		if (data->int_time == 0)
			*val2 = 400000;
		else if (data->int_time == 1)
			*val2 = 200000;
		else if (data->int_time == 2)
			*val2 = 100000;
		else
			return -EINVAL;
		*val = 0;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static int tsl4531_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct tsl4531_data *data = iio_priv(indio_dev);
	int int_time, ret;

	switch (mask) {
	case IIO_CHAN_INFO_INT_TIME:
		if (val != 0)
			return -EINVAL;
		if (val2 == 400000)
			int_time = 0;
		else if (val2 == 200000)
			int_time = 1;
		else if (val2 == 100000)
			int_time = 2;
		else
			return -EINVAL;
		mutex_lock(&data->lock);
		ret = i2c_smbus_write_byte_data(data->client,
			TSL4531_CONFIG, int_time);
		if (ret >= 0)
			data->int_time = int_time;
		mutex_unlock(&data->lock);
		return ret;
	default:
		return -EINVAL;
	}
}

static const struct iio_info tsl4531_info = {
	.read_raw = tsl4531_read_raw,
	.write_raw = tsl4531_write_raw,
	.attrs = &tsl4531_attribute_group,
	.driver_module = THIS_MODULE,
};

static int tsl4531_check_id(struct i2c_client *client)
{
	int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
	if (ret < 0)
		return ret;

	switch (ret >> TSL4531_ID_SHIFT) {
	case TSL45311_ID:
	case TSL45313_ID:
	case TSL45315_ID:
	case TSL45317_ID:
		return 0;
	default:
		return -ENODEV;
	}
}

static int tsl4531_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct tsl4531_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;
	mutex_init(&data->lock);

	ret = tsl4531_check_id(client);
	if (ret) {
		dev_err(&client->dev, "no TSL4531 sensor\n");
		return ret;
	}

	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,
		TSL4531_MODE_NORMAL);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,
		TSL4531_TCNTRL_400MS);
	if (ret < 0)
		return ret;

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &tsl4531_info;
	indio_dev->channels = tsl4531_channels;
	indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);
	indio_dev->name = TSL4531_DRV_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;

	return iio_device_register(indio_dev);
}

static int tsl4531_powerdown(struct i2c_client *client)
{
	return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
		TSL4531_MODE_POWERDOWN);
}

static int tsl4531_remove(struct i2c_client *client)
{
	iio_device_unregister(i2c_get_clientdata(client));
	tsl4531_powerdown(client);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tsl4531_suspend(struct device *dev)
{
	return tsl4531_powerdown(to_i2c_client(dev));
}

static int tsl4531_resume(struct device *dev)
{
	return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,
		TSL4531_MODE_NORMAL);
}

static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
#define TSL4531_PM_OPS (&tsl4531_pm_ops)
#else
#define TSL4531_PM_OPS NULL
#endif

static const struct i2c_device_id tsl4531_id[] = {
	{ "tsl4531", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tsl4531_id);

static struct i2c_driver tsl4531_driver = {
	.driver = {
		.name   = TSL4531_DRV_NAME,
		.pm	= TSL4531_PM_OPS,
	},
	.probe  = tsl4531_probe,
	.remove = tsl4531_remove,
	.id_table = tsl4531_id,
};

module_i2c_driver(tsl4531_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud