1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * isl29125.c - Support for Intersil ISL29125 RGB light sensor
4 *
5 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
6 *
7 * RGB light sensor with 16-bit channels for red, green, blue);
8 * 7-bit I2C slave address 0x44
9 *
10 * TODO: interrupt support, IR compensation, thresholds, 12bit
11 */
12
13 #include <linux/module.h>
14 #include <linux/i2c.h>
15 #include <linux/delay.h>
16 #include <linux/pm.h>
17
18 #include <linux/iio/iio.h>
19 #include <linux/iio/sysfs.h>
20 #include <linux/iio/trigger_consumer.h>
21 #include <linux/iio/buffer.h>
22 #include <linux/iio/triggered_buffer.h>
23
24 #define ISL29125_DRV_NAME "isl29125"
25
26 #define ISL29125_DEVICE_ID 0x00
27 #define ISL29125_CONF1 0x01
28 #define ISL29125_CONF2 0x02
29 #define ISL29125_CONF3 0x03
30 #define ISL29125_STATUS 0x08
31 #define ISL29125_GREEN_DATA 0x09
32 #define ISL29125_RED_DATA 0x0b
33 #define ISL29125_BLUE_DATA 0x0d
34
35 #define ISL29125_ID 0x7d
36
37 #define ISL29125_MODE_MASK GENMASK(2, 0)
38 #define ISL29125_MODE_PD 0x0
39 #define ISL29125_MODE_G 0x1
40 #define ISL29125_MODE_R 0x2
41 #define ISL29125_MODE_B 0x3
42 #define ISL29125_MODE_RGB 0x5
43
44 #define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */
45 #define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */
46
47 #define ISL29125_MODE_RANGE BIT(3)
48
49 #define ISL29125_STATUS_CONV BIT(1)
50
51 struct isl29125_data {
52 struct i2c_client *client;
53 u8 conf1;
54 /* Ensure timestamp is naturally aligned */
55 struct {
56 u16 chans[3];
57 s64 timestamp __aligned(8);
58 } scan;
59 };
60
61 #define ISL29125_CHANNEL(_color, _si) { \
62 .type = IIO_INTENSITY, \
63 .modified = 1, \
64 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
65 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
66 .channel2 = IIO_MOD_LIGHT_##_color, \
67 .scan_index = _si, \
68 .scan_type = { \
69 .sign = 'u', \
70 .realbits = 16, \
71 .storagebits = 16, \
72 .endianness = IIO_CPU, \
73 }, \
74 }
75
76 static const struct iio_chan_spec isl29125_channels[] = {
77 ISL29125_CHANNEL(GREEN, 0),
78 ISL29125_CHANNEL(RED, 1),
79 ISL29125_CHANNEL(BLUE, 2),
80 IIO_CHAN_SOFT_TIMESTAMP(3),
81 };
82
83 static const struct {
84 u8 mode, data;
85 } isl29125_regs[] = {
86 {ISL29125_MODE_G, ISL29125_GREEN_DATA},
87 {ISL29125_MODE_R, ISL29125_RED_DATA},
88 {ISL29125_MODE_B, ISL29125_BLUE_DATA},
89 };
90
isl29125_read_data(struct isl29125_data * data,int si)91 static int isl29125_read_data(struct isl29125_data *data, int si)
92 {
93 int tries = 5;
94 int ret;
95
96 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
97 data->conf1 | isl29125_regs[si].mode);
98 if (ret < 0)
99 return ret;
100
101 msleep(101);
102
103 while (tries--) {
104 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
105 if (ret < 0)
106 goto fail;
107 if (ret & ISL29125_STATUS_CONV)
108 break;
109 msleep(20);
110 }
111
112 if (tries < 0) {
113 dev_err(&data->client->dev, "data not ready\n");
114 ret = -EIO;
115 goto fail;
116 }
117
118 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
119
120 fail:
121 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
122 return ret;
123 }
124
isl29125_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)125 static int isl29125_read_raw(struct iio_dev *indio_dev,
126 struct iio_chan_spec const *chan,
127 int *val, int *val2, long mask)
128 {
129 struct isl29125_data *data = iio_priv(indio_dev);
130 int ret;
131
132 switch (mask) {
133 case IIO_CHAN_INFO_RAW:
134 ret = iio_device_claim_direct_mode(indio_dev);
135 if (ret)
136 return ret;
137 ret = isl29125_read_data(data, chan->scan_index);
138 iio_device_release_direct_mode(indio_dev);
139 if (ret < 0)
140 return ret;
141 *val = ret;
142 return IIO_VAL_INT;
143 case IIO_CHAN_INFO_SCALE:
144 *val = 0;
145 if (data->conf1 & ISL29125_MODE_RANGE)
146 *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/
147 else
148 *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/
149 return IIO_VAL_INT_PLUS_MICRO;
150 }
151 return -EINVAL;
152 }
153
isl29125_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)154 static int isl29125_write_raw(struct iio_dev *indio_dev,
155 struct iio_chan_spec const *chan,
156 int val, int val2, long mask)
157 {
158 struct isl29125_data *data = iio_priv(indio_dev);
159
160 switch (mask) {
161 case IIO_CHAN_INFO_SCALE:
162 if (val != 0)
163 return -EINVAL;
164 if (val2 == ISL29125_SENSING_RANGE_1)
165 data->conf1 |= ISL29125_MODE_RANGE;
166 else if (val2 == ISL29125_SENSING_RANGE_0)
167 data->conf1 &= ~ISL29125_MODE_RANGE;
168 else
169 return -EINVAL;
170 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
171 data->conf1);
172 default:
173 return -EINVAL;
174 }
175 }
176
isl29125_trigger_handler(int irq,void * p)177 static irqreturn_t isl29125_trigger_handler(int irq, void *p)
178 {
179 struct iio_poll_func *pf = p;
180 struct iio_dev *indio_dev = pf->indio_dev;
181 struct isl29125_data *data = iio_priv(indio_dev);
182 int i, j = 0;
183
184 iio_for_each_active_channel(indio_dev, i) {
185 int ret = i2c_smbus_read_word_data(data->client,
186 isl29125_regs[i].data);
187 if (ret < 0)
188 goto done;
189
190 data->scan.chans[j++] = ret;
191 }
192
193 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
194 iio_get_time_ns(indio_dev));
195
196 done:
197 iio_trigger_notify_done(indio_dev->trig);
198
199 return IRQ_HANDLED;
200 }
201
202 static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");
203
204 static struct attribute *isl29125_attributes[] = {
205 &iio_const_attr_scale_available.dev_attr.attr,
206 NULL
207 };
208
209 static const struct attribute_group isl29125_attribute_group = {
210 .attrs = isl29125_attributes,
211 };
212
213 static const struct iio_info isl29125_info = {
214 .read_raw = isl29125_read_raw,
215 .write_raw = isl29125_write_raw,
216 .attrs = &isl29125_attribute_group,
217 };
218
isl29125_buffer_postenable(struct iio_dev * indio_dev)219 static int isl29125_buffer_postenable(struct iio_dev *indio_dev)
220 {
221 struct isl29125_data *data = iio_priv(indio_dev);
222
223 data->conf1 |= ISL29125_MODE_RGB;
224 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
225 data->conf1);
226 }
227
isl29125_buffer_predisable(struct iio_dev * indio_dev)228 static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
229 {
230 struct isl29125_data *data = iio_priv(indio_dev);
231
232 data->conf1 &= ~ISL29125_MODE_MASK;
233 data->conf1 |= ISL29125_MODE_PD;
234 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
235 data->conf1);
236 }
237
238 static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
239 .postenable = isl29125_buffer_postenable,
240 .predisable = isl29125_buffer_predisable,
241 };
242
isl29125_probe(struct i2c_client * client)243 static int isl29125_probe(struct i2c_client *client)
244 {
245 struct isl29125_data *data;
246 struct iio_dev *indio_dev;
247 int ret;
248
249 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
250 if (indio_dev == NULL)
251 return -ENOMEM;
252
253 data = iio_priv(indio_dev);
254 i2c_set_clientdata(client, indio_dev);
255 data->client = client;
256
257 indio_dev->info = &isl29125_info;
258 indio_dev->name = ISL29125_DRV_NAME;
259 indio_dev->channels = isl29125_channels;
260 indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);
261 indio_dev->modes = INDIO_DIRECT_MODE;
262
263 ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
264 if (ret < 0)
265 return ret;
266 if (ret != ISL29125_ID)
267 return -ENODEV;
268
269 data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
270 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
271 data->conf1);
272 if (ret < 0)
273 return ret;
274
275 ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
276 if (ret < 0)
277 return ret;
278
279 ret = iio_triggered_buffer_setup(indio_dev, NULL,
280 isl29125_trigger_handler, &isl29125_buffer_setup_ops);
281 if (ret < 0)
282 return ret;
283
284 ret = iio_device_register(indio_dev);
285 if (ret < 0)
286 goto buffer_cleanup;
287
288 return 0;
289
290 buffer_cleanup:
291 iio_triggered_buffer_cleanup(indio_dev);
292 return ret;
293 }
294
isl29125_powerdown(struct isl29125_data * data)295 static int isl29125_powerdown(struct isl29125_data *data)
296 {
297 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
298 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);
299 }
300
isl29125_remove(struct i2c_client * client)301 static void isl29125_remove(struct i2c_client *client)
302 {
303 struct iio_dev *indio_dev = i2c_get_clientdata(client);
304
305 iio_device_unregister(indio_dev);
306 iio_triggered_buffer_cleanup(indio_dev);
307 isl29125_powerdown(iio_priv(indio_dev));
308 }
309
isl29125_suspend(struct device * dev)310 static int isl29125_suspend(struct device *dev)
311 {
312 struct isl29125_data *data = iio_priv(i2c_get_clientdata(
313 to_i2c_client(dev)));
314 return isl29125_powerdown(data);
315 }
316
isl29125_resume(struct device * dev)317 static int isl29125_resume(struct device *dev)
318 {
319 struct isl29125_data *data = iio_priv(i2c_get_clientdata(
320 to_i2c_client(dev)));
321 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
322 data->conf1);
323 }
324
325 static DEFINE_SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend,
326 isl29125_resume);
327
328 static const struct i2c_device_id isl29125_id[] = {
329 { "isl29125" },
330 { }
331 };
332 MODULE_DEVICE_TABLE(i2c, isl29125_id);
333
334 static struct i2c_driver isl29125_driver = {
335 .driver = {
336 .name = ISL29125_DRV_NAME,
337 .pm = pm_sleep_ptr(&isl29125_pm_ops),
338 },
339 .probe = isl29125_probe,
340 .remove = isl29125_remove,
341 .id_table = isl29125_id,
342 };
343 module_i2c_driver(isl29125_driver);
344
345 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
346 MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
347 MODULE_LICENSE("GPL");
348