1741172d1SMartyn Welch // SPDX-License-Identifier: GPL-2.0+
2741172d1SMartyn Welch /*
3741172d1SMartyn Welch * Support for ON Semiconductor NOA1305 ambient light sensor
4741172d1SMartyn Welch *
5741172d1SMartyn Welch * Copyright (C) 2016 Emcraft Systems
6741172d1SMartyn Welch * Copyright (C) 2019 Collabora Ltd.
7741172d1SMartyn Welch */
8741172d1SMartyn Welch
9741172d1SMartyn Welch #include <linux/delay.h>
10741172d1SMartyn Welch #include <linux/err.h>
11741172d1SMartyn Welch #include <linux/i2c.h>
12741172d1SMartyn Welch #include <linux/iio/iio.h>
13741172d1SMartyn Welch #include <linux/iio/sysfs.h>
14741172d1SMartyn Welch #include <linux/module.h>
15741172d1SMartyn Welch #include <linux/regmap.h>
16741172d1SMartyn Welch #include <linux/regulator/consumer.h>
17741172d1SMartyn Welch
18741172d1SMartyn Welch #define NOA1305_REG_POWER_CONTROL 0x0
19741172d1SMartyn Welch #define NOA1305_POWER_CONTROL_DOWN 0x00
20741172d1SMartyn Welch #define NOA1305_POWER_CONTROL_ON 0x08
21741172d1SMartyn Welch #define NOA1305_REG_RESET 0x1
22741172d1SMartyn Welch #define NOA1305_RESET_RESET 0x10
23741172d1SMartyn Welch #define NOA1305_REG_INTEGRATION_TIME 0x2
24741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_800MS 0x00
25741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_400MS 0x01
26741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_200MS 0x02
27741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_100MS 0x03
28741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_50MS 0x04
29741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_25MS 0x05
30741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_12_5MS 0x06
31741172d1SMartyn Welch #define NOA1305_INTEGR_TIME_6_25MS 0x07
32741172d1SMartyn Welch #define NOA1305_REG_INT_SELECT 0x3
33741172d1SMartyn Welch #define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
34741172d1SMartyn Welch #define NOA1305_INT_SEL_ACTIVE_LOW 0x02
35741172d1SMartyn Welch #define NOA1305_INT_SEL_INACTIVE 0x03
36741172d1SMartyn Welch #define NOA1305_REG_INT_THRESH_LSB 0x4
37741172d1SMartyn Welch #define NOA1305_REG_INT_THRESH_MSB 0x5
38741172d1SMartyn Welch #define NOA1305_REG_ALS_DATA_LSB 0x6
39741172d1SMartyn Welch #define NOA1305_REG_ALS_DATA_MSB 0x7
40741172d1SMartyn Welch #define NOA1305_REG_DEVICE_ID_LSB 0x8
41741172d1SMartyn Welch #define NOA1305_REG_DEVICE_ID_MSB 0x9
42741172d1SMartyn Welch
43741172d1SMartyn Welch #define NOA1305_DEVICE_ID 0x0519
44741172d1SMartyn Welch #define NOA1305_DRIVER_NAME "noa1305"
45741172d1SMartyn Welch
46741172d1SMartyn Welch struct noa1305_priv {
47741172d1SMartyn Welch struct i2c_client *client;
48741172d1SMartyn Welch struct regmap *regmap;
49741172d1SMartyn Welch };
50741172d1SMartyn Welch
noa1305_measure(struct noa1305_priv * priv)51741172d1SMartyn Welch static int noa1305_measure(struct noa1305_priv *priv)
52741172d1SMartyn Welch {
53741172d1SMartyn Welch __le16 data;
54741172d1SMartyn Welch int ret;
55741172d1SMartyn Welch
56741172d1SMartyn Welch ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
57741172d1SMartyn Welch 2);
58741172d1SMartyn Welch if (ret < 0)
59741172d1SMartyn Welch return ret;
60741172d1SMartyn Welch
61741172d1SMartyn Welch return le16_to_cpu(data);
62741172d1SMartyn Welch }
63741172d1SMartyn Welch
noa1305_scale(struct noa1305_priv * priv,int * val,int * val2)64741172d1SMartyn Welch static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
65741172d1SMartyn Welch {
66741172d1SMartyn Welch int data;
67741172d1SMartyn Welch int ret;
68741172d1SMartyn Welch
69741172d1SMartyn Welch ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
70741172d1SMartyn Welch if (ret < 0)
71741172d1SMartyn Welch return ret;
72741172d1SMartyn Welch
73741172d1SMartyn Welch /*
74741172d1SMartyn Welch * Lux = count / (<Integration Constant> * <Integration Time>)
75741172d1SMartyn Welch *
76741172d1SMartyn Welch * Integration Constant = 7.7
77741172d1SMartyn Welch * Integration Time in Seconds
78741172d1SMartyn Welch */
79741172d1SMartyn Welch switch (data) {
80741172d1SMartyn Welch case NOA1305_INTEGR_TIME_800MS:
81741172d1SMartyn Welch *val = 100;
82741172d1SMartyn Welch *val2 = 77 * 8;
83741172d1SMartyn Welch break;
84741172d1SMartyn Welch case NOA1305_INTEGR_TIME_400MS:
85741172d1SMartyn Welch *val = 100;
86741172d1SMartyn Welch *val2 = 77 * 4;
8731664caaSJonathan Cameron break;
88741172d1SMartyn Welch case NOA1305_INTEGR_TIME_200MS:
89741172d1SMartyn Welch *val = 100;
90741172d1SMartyn Welch *val2 = 77 * 2;
91741172d1SMartyn Welch break;
92741172d1SMartyn Welch case NOA1305_INTEGR_TIME_100MS:
93741172d1SMartyn Welch *val = 100;
94741172d1SMartyn Welch *val2 = 77;
95741172d1SMartyn Welch break;
96741172d1SMartyn Welch case NOA1305_INTEGR_TIME_50MS:
97741172d1SMartyn Welch *val = 1000;
98741172d1SMartyn Welch *val2 = 77 * 5;
99741172d1SMartyn Welch break;
100741172d1SMartyn Welch case NOA1305_INTEGR_TIME_25MS:
101741172d1SMartyn Welch *val = 10000;
102741172d1SMartyn Welch *val2 = 77 * 25;
103741172d1SMartyn Welch break;
104741172d1SMartyn Welch case NOA1305_INTEGR_TIME_12_5MS:
105741172d1SMartyn Welch *val = 100000;
106741172d1SMartyn Welch *val2 = 77 * 125;
107741172d1SMartyn Welch break;
108741172d1SMartyn Welch case NOA1305_INTEGR_TIME_6_25MS:
109741172d1SMartyn Welch *val = 1000000;
110741172d1SMartyn Welch *val2 = 77 * 625;
111741172d1SMartyn Welch break;
112741172d1SMartyn Welch default:
113741172d1SMartyn Welch return -EINVAL;
114741172d1SMartyn Welch }
115741172d1SMartyn Welch
116741172d1SMartyn Welch return IIO_VAL_FRACTIONAL;
117741172d1SMartyn Welch }
118741172d1SMartyn Welch
119741172d1SMartyn Welch static const struct iio_chan_spec noa1305_channels[] = {
120741172d1SMartyn Welch {
121741172d1SMartyn Welch .type = IIO_LIGHT,
122741172d1SMartyn Welch .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
123741172d1SMartyn Welch .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
124741172d1SMartyn Welch }
125741172d1SMartyn Welch };
126741172d1SMartyn Welch
noa1305_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)127741172d1SMartyn Welch static int noa1305_read_raw(struct iio_dev *indio_dev,
128741172d1SMartyn Welch struct iio_chan_spec const *chan,
129741172d1SMartyn Welch int *val, int *val2, long mask)
130741172d1SMartyn Welch {
131741172d1SMartyn Welch int ret = -EINVAL;
132741172d1SMartyn Welch struct noa1305_priv *priv = iio_priv(indio_dev);
133741172d1SMartyn Welch
134741172d1SMartyn Welch switch (mask) {
135741172d1SMartyn Welch case IIO_CHAN_INFO_RAW:
136741172d1SMartyn Welch switch (chan->type) {
137741172d1SMartyn Welch case IIO_LIGHT:
138741172d1SMartyn Welch ret = noa1305_measure(priv);
139741172d1SMartyn Welch if (ret < 0)
140741172d1SMartyn Welch return ret;
141741172d1SMartyn Welch *val = ret;
142741172d1SMartyn Welch return IIO_VAL_INT;
143741172d1SMartyn Welch default:
144741172d1SMartyn Welch break;
145741172d1SMartyn Welch }
146741172d1SMartyn Welch break;
147741172d1SMartyn Welch case IIO_CHAN_INFO_SCALE:
148741172d1SMartyn Welch switch (chan->type) {
149741172d1SMartyn Welch case IIO_LIGHT:
150741172d1SMartyn Welch return noa1305_scale(priv, val, val2);
151741172d1SMartyn Welch default:
152741172d1SMartyn Welch break;
153741172d1SMartyn Welch }
154741172d1SMartyn Welch break;
155741172d1SMartyn Welch default:
156741172d1SMartyn Welch break;
157741172d1SMartyn Welch }
158741172d1SMartyn Welch
159741172d1SMartyn Welch return ret;
160741172d1SMartyn Welch }
161741172d1SMartyn Welch
162741172d1SMartyn Welch static const struct iio_info noa1305_info = {
163741172d1SMartyn Welch .read_raw = noa1305_read_raw,
164741172d1SMartyn Welch };
165741172d1SMartyn Welch
noa1305_writable_reg(struct device * dev,unsigned int reg)166741172d1SMartyn Welch static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
167741172d1SMartyn Welch {
168741172d1SMartyn Welch switch (reg) {
169741172d1SMartyn Welch case NOA1305_REG_POWER_CONTROL:
170741172d1SMartyn Welch case NOA1305_REG_RESET:
171741172d1SMartyn Welch case NOA1305_REG_INTEGRATION_TIME:
172741172d1SMartyn Welch case NOA1305_REG_INT_SELECT:
173741172d1SMartyn Welch case NOA1305_REG_INT_THRESH_LSB:
174741172d1SMartyn Welch case NOA1305_REG_INT_THRESH_MSB:
175741172d1SMartyn Welch return true;
176741172d1SMartyn Welch default:
177741172d1SMartyn Welch return false;
178741172d1SMartyn Welch }
179741172d1SMartyn Welch }
180741172d1SMartyn Welch
181741172d1SMartyn Welch static const struct regmap_config noa1305_regmap_config = {
182741172d1SMartyn Welch .name = NOA1305_DRIVER_NAME,
183741172d1SMartyn Welch .reg_bits = 8,
184741172d1SMartyn Welch .val_bits = 8,
185741172d1SMartyn Welch .max_register = NOA1305_REG_DEVICE_ID_MSB,
186741172d1SMartyn Welch .writeable_reg = noa1305_writable_reg,
187741172d1SMartyn Welch };
188741172d1SMartyn Welch
noa1305_probe(struct i2c_client * client)189c49135d9SUwe Kleine-König static int noa1305_probe(struct i2c_client *client)
190741172d1SMartyn Welch {
191741172d1SMartyn Welch struct noa1305_priv *priv;
192741172d1SMartyn Welch struct iio_dev *indio_dev;
193741172d1SMartyn Welch struct regmap *regmap;
194741172d1SMartyn Welch __le16 data;
195741172d1SMartyn Welch unsigned int dev_id;
196741172d1SMartyn Welch int ret;
197741172d1SMartyn Welch
198741172d1SMartyn Welch indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
199741172d1SMartyn Welch if (!indio_dev)
200741172d1SMartyn Welch return -ENOMEM;
201741172d1SMartyn Welch
202741172d1SMartyn Welch regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
203741172d1SMartyn Welch if (IS_ERR(regmap)) {
204741172d1SMartyn Welch dev_err(&client->dev, "Regmap initialization failed.\n");
205741172d1SMartyn Welch return PTR_ERR(regmap);
206741172d1SMartyn Welch }
207741172d1SMartyn Welch
208741172d1SMartyn Welch priv = iio_priv(indio_dev);
209741172d1SMartyn Welch
210b620be5fSJonathan Cameron ret = devm_regulator_get_enable(&client->dev, "vin");
211b620be5fSJonathan Cameron if (ret)
212b620be5fSJonathan Cameron return dev_err_probe(&client->dev, ret,
213c1b4de6aSCai Huoqing "get regulator vin failed\n");
214741172d1SMartyn Welch
215741172d1SMartyn Welch i2c_set_clientdata(client, indio_dev);
216741172d1SMartyn Welch priv->client = client;
217741172d1SMartyn Welch priv->regmap = regmap;
218741172d1SMartyn Welch
219741172d1SMartyn Welch ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
220741172d1SMartyn Welch if (ret < 0) {
221741172d1SMartyn Welch dev_err(&client->dev, "ID reading failed: %d\n", ret);
222741172d1SMartyn Welch return ret;
223741172d1SMartyn Welch }
224741172d1SMartyn Welch
225741172d1SMartyn Welch dev_id = le16_to_cpu(data);
226741172d1SMartyn Welch if (dev_id != NOA1305_DEVICE_ID) {
227741172d1SMartyn Welch dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
228741172d1SMartyn Welch return -ENODEV;
229741172d1SMartyn Welch }
230741172d1SMartyn Welch
231741172d1SMartyn Welch ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
232741172d1SMartyn Welch NOA1305_POWER_CONTROL_ON);
233741172d1SMartyn Welch if (ret < 0) {
234741172d1SMartyn Welch dev_err(&client->dev, "Enabling power control failed\n");
235741172d1SMartyn Welch return ret;
236741172d1SMartyn Welch }
237741172d1SMartyn Welch
238741172d1SMartyn Welch ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
239741172d1SMartyn Welch if (ret < 0) {
240741172d1SMartyn Welch dev_err(&client->dev, "Device reset failed\n");
241741172d1SMartyn Welch return ret;
242741172d1SMartyn Welch }
243741172d1SMartyn Welch
244741172d1SMartyn Welch ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
245741172d1SMartyn Welch NOA1305_INTEGR_TIME_800MS);
246741172d1SMartyn Welch if (ret < 0) {
247741172d1SMartyn Welch dev_err(&client->dev, "Setting integration time failed\n");
248741172d1SMartyn Welch return ret;
249741172d1SMartyn Welch }
250741172d1SMartyn Welch
251741172d1SMartyn Welch indio_dev->info = &noa1305_info;
252741172d1SMartyn Welch indio_dev->channels = noa1305_channels;
253741172d1SMartyn Welch indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
254741172d1SMartyn Welch indio_dev->name = NOA1305_DRIVER_NAME;
255741172d1SMartyn Welch indio_dev->modes = INDIO_DIRECT_MODE;
256741172d1SMartyn Welch
257741172d1SMartyn Welch ret = devm_iio_device_register(&client->dev, indio_dev);
258741172d1SMartyn Welch if (ret)
259741172d1SMartyn Welch dev_err(&client->dev, "registering device failed\n");
260741172d1SMartyn Welch
261741172d1SMartyn Welch return ret;
262741172d1SMartyn Welch }
263741172d1SMartyn Welch
264741172d1SMartyn Welch static const struct of_device_id noa1305_of_match[] = {
265741172d1SMartyn Welch { .compatible = "onnn,noa1305" },
266741172d1SMartyn Welch { }
267741172d1SMartyn Welch };
268741172d1SMartyn Welch MODULE_DEVICE_TABLE(of, noa1305_of_match);
269741172d1SMartyn Welch
270741172d1SMartyn Welch static const struct i2c_device_id noa1305_ids[] = {
271*4391affaSUwe Kleine-König { "noa1305" },
272741172d1SMartyn Welch { }
273741172d1SMartyn Welch };
274741172d1SMartyn Welch MODULE_DEVICE_TABLE(i2c, noa1305_ids);
275741172d1SMartyn Welch
276741172d1SMartyn Welch static struct i2c_driver noa1305_driver = {
277741172d1SMartyn Welch .driver = {
278741172d1SMartyn Welch .name = NOA1305_DRIVER_NAME,
279741172d1SMartyn Welch .of_match_table = noa1305_of_match,
280741172d1SMartyn Welch },
2817cf15f42SUwe Kleine-König .probe = noa1305_probe,
282741172d1SMartyn Welch .id_table = noa1305_ids,
283741172d1SMartyn Welch };
284741172d1SMartyn Welch
285741172d1SMartyn Welch module_i2c_driver(noa1305_driver);
286741172d1SMartyn Welch
287741172d1SMartyn Welch MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
288741172d1SMartyn Welch MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
289741172d1SMartyn Welch MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
290741172d1SMartyn Welch MODULE_LICENSE("GPL");
291