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9#include <linux/delay.h>
10#include <linux/err.h>
11#include <linux/i2c.h>
12#include <linux/iio/iio.h>
13#include <linux/iio/sysfs.h>
14#include <linux/module.h>
15#include <linux/regmap.h>
16#include <linux/regulator/consumer.h>
17
18#define NOA1305_REG_POWER_CONTROL 0x0
19#define NOA1305_POWER_CONTROL_DOWN 0x00
20#define NOA1305_POWER_CONTROL_ON 0x08
21#define NOA1305_REG_RESET 0x1
22#define NOA1305_RESET_RESET 0x10
23#define NOA1305_REG_INTEGRATION_TIME 0x2
24#define NOA1305_INTEGR_TIME_800MS 0x00
25#define NOA1305_INTEGR_TIME_400MS 0x01
26#define NOA1305_INTEGR_TIME_200MS 0x02
27#define NOA1305_INTEGR_TIME_100MS 0x03
28#define NOA1305_INTEGR_TIME_50MS 0x04
29#define NOA1305_INTEGR_TIME_25MS 0x05
30#define NOA1305_INTEGR_TIME_12_5MS 0x06
31#define NOA1305_INTEGR_TIME_6_25MS 0x07
32#define NOA1305_REG_INT_SELECT 0x3
33#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
34#define NOA1305_INT_SEL_ACTIVE_LOW 0x02
35#define NOA1305_INT_SEL_INACTIVE 0x03
36#define NOA1305_REG_INT_THRESH_LSB 0x4
37#define NOA1305_REG_INT_THRESH_MSB 0x5
38#define NOA1305_REG_ALS_DATA_LSB 0x6
39#define NOA1305_REG_ALS_DATA_MSB 0x7
40#define NOA1305_REG_DEVICE_ID_LSB 0x8
41#define NOA1305_REG_DEVICE_ID_MSB 0x9
42
43#define NOA1305_DEVICE_ID 0x0519
44#define NOA1305_DRIVER_NAME "noa1305"
45
46struct noa1305_priv {
47 struct i2c_client *client;
48 struct regmap *regmap;
49 struct regulator *vin_reg;
50};
51
52static int noa1305_measure(struct noa1305_priv *priv)
53{
54 __le16 data;
55 int ret;
56
57 ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
58 2);
59 if (ret < 0)
60 return ret;
61
62 return le16_to_cpu(data);
63}
64
65static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
66{
67 int data;
68 int ret;
69
70 ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
71 if (ret < 0)
72 return ret;
73
74
75
76
77
78
79
80 switch (data) {
81 case NOA1305_INTEGR_TIME_800MS:
82 *val = 100;
83 *val2 = 77 * 8;
84 break;
85 case NOA1305_INTEGR_TIME_400MS:
86 *val = 100;
87 *val2 = 77 * 4;
88 break;
89 case NOA1305_INTEGR_TIME_200MS:
90 *val = 100;
91 *val2 = 77 * 2;
92 break;
93 case NOA1305_INTEGR_TIME_100MS:
94 *val = 100;
95 *val2 = 77;
96 break;
97 case NOA1305_INTEGR_TIME_50MS:
98 *val = 1000;
99 *val2 = 77 * 5;
100 break;
101 case NOA1305_INTEGR_TIME_25MS:
102 *val = 10000;
103 *val2 = 77 * 25;
104 break;
105 case NOA1305_INTEGR_TIME_12_5MS:
106 *val = 100000;
107 *val2 = 77 * 125;
108 break;
109 case NOA1305_INTEGR_TIME_6_25MS:
110 *val = 1000000;
111 *val2 = 77 * 625;
112 break;
113 default:
114 return -EINVAL;
115 }
116
117 return IIO_VAL_FRACTIONAL;
118}
119
120static const struct iio_chan_spec noa1305_channels[] = {
121 {
122 .type = IIO_LIGHT,
123 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
124 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
125 }
126};
127
128static int noa1305_read_raw(struct iio_dev *indio_dev,
129 struct iio_chan_spec const *chan,
130 int *val, int *val2, long mask)
131{
132 int ret = -EINVAL;
133 struct noa1305_priv *priv = iio_priv(indio_dev);
134
135 switch (mask) {
136 case IIO_CHAN_INFO_RAW:
137 switch (chan->type) {
138 case IIO_LIGHT:
139 ret = noa1305_measure(priv);
140 if (ret < 0)
141 return ret;
142 *val = ret;
143 return IIO_VAL_INT;
144 default:
145 break;
146 }
147 break;
148 case IIO_CHAN_INFO_SCALE:
149 switch (chan->type) {
150 case IIO_LIGHT:
151 return noa1305_scale(priv, val, val2);
152 default:
153 break;
154 }
155 break;
156 default:
157 break;
158 }
159
160 return ret;
161}
162
163static const struct iio_info noa1305_info = {
164 .read_raw = noa1305_read_raw,
165};
166
167static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
168{
169 switch (reg) {
170 case NOA1305_REG_POWER_CONTROL:
171 case NOA1305_REG_RESET:
172 case NOA1305_REG_INTEGRATION_TIME:
173 case NOA1305_REG_INT_SELECT:
174 case NOA1305_REG_INT_THRESH_LSB:
175 case NOA1305_REG_INT_THRESH_MSB:
176 return true;
177 default:
178 return false;
179 }
180}
181
182static const struct regmap_config noa1305_regmap_config = {
183 .name = NOA1305_DRIVER_NAME,
184 .reg_bits = 8,
185 .val_bits = 8,
186 .max_register = NOA1305_REG_DEVICE_ID_MSB,
187 .writeable_reg = noa1305_writable_reg,
188};
189
190static void noa1305_reg_remove(void *data)
191{
192 struct noa1305_priv *priv = data;
193
194 regulator_disable(priv->vin_reg);
195}
196
197static int noa1305_probe(struct i2c_client *client,
198 const struct i2c_device_id *id)
199{
200 struct noa1305_priv *priv;
201 struct iio_dev *indio_dev;
202 struct regmap *regmap;
203 __le16 data;
204 unsigned int dev_id;
205 int ret;
206
207 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
208 if (!indio_dev)
209 return -ENOMEM;
210
211 regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
212 if (IS_ERR(regmap)) {
213 dev_err(&client->dev, "Regmap initialization failed.\n");
214 return PTR_ERR(regmap);
215 }
216
217 priv = iio_priv(indio_dev);
218
219 priv->vin_reg = devm_regulator_get(&client->dev, "vin");
220 if (IS_ERR(priv->vin_reg)) {
221 dev_err(&client->dev, "get regulator vin failed\n");
222 return PTR_ERR(priv->vin_reg);
223 }
224
225 ret = regulator_enable(priv->vin_reg);
226 if (ret) {
227 dev_err(&client->dev, "enable regulator vin failed\n");
228 return ret;
229 }
230
231 ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv);
232 if (ret) {
233 dev_err(&client->dev, "addition of devm action failed\n");
234 return ret;
235 }
236
237 i2c_set_clientdata(client, indio_dev);
238 priv->client = client;
239 priv->regmap = regmap;
240
241 ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
242 if (ret < 0) {
243 dev_err(&client->dev, "ID reading failed: %d\n", ret);
244 return ret;
245 }
246
247 dev_id = le16_to_cpu(data);
248 if (dev_id != NOA1305_DEVICE_ID) {
249 dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
250 return -ENODEV;
251 }
252
253 ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
254 NOA1305_POWER_CONTROL_ON);
255 if (ret < 0) {
256 dev_err(&client->dev, "Enabling power control failed\n");
257 return ret;
258 }
259
260 ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
261 if (ret < 0) {
262 dev_err(&client->dev, "Device reset failed\n");
263 return ret;
264 }
265
266 ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
267 NOA1305_INTEGR_TIME_800MS);
268 if (ret < 0) {
269 dev_err(&client->dev, "Setting integration time failed\n");
270 return ret;
271 }
272
273 indio_dev->info = &noa1305_info;
274 indio_dev->channels = noa1305_channels;
275 indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
276 indio_dev->name = NOA1305_DRIVER_NAME;
277 indio_dev->modes = INDIO_DIRECT_MODE;
278
279 ret = devm_iio_device_register(&client->dev, indio_dev);
280 if (ret)
281 dev_err(&client->dev, "registering device failed\n");
282
283 return ret;
284}
285
286static const struct of_device_id noa1305_of_match[] = {
287 { .compatible = "onnn,noa1305" },
288 { }
289};
290MODULE_DEVICE_TABLE(of, noa1305_of_match);
291
292static const struct i2c_device_id noa1305_ids[] = {
293 { "noa1305", 0 },
294 { }
295};
296MODULE_DEVICE_TABLE(i2c, noa1305_ids);
297
298static struct i2c_driver noa1305_driver = {
299 .driver = {
300 .name = NOA1305_DRIVER_NAME,
301 .of_match_table = noa1305_of_match,
302 },
303 .probe = noa1305_probe,
304 .id_table = noa1305_ids,
305};
306
307module_i2c_driver(noa1305_driver);
308
309MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
310MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
311MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
312MODULE_LICENSE("GPL");
313
