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17#include <linux/module.h>
18#include <linux/i2c.h>
19#include <linux/delay.h>
20#include <linux/pm.h>
21
22#include <linux/iio/iio.h>
23#include <linux/iio/sysfs.h>
24#include <linux/iio/trigger_consumer.h>
25#include <linux/iio/buffer.h>
26#include <linux/iio/triggered_buffer.h>
27
28#define TCS3414_DRV_NAME "tcs3414"
29
30#define TCS3414_COMMAND BIT(7)
31#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
32
33#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
34#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
35#define TCS3414_ID (TCS3414_COMMAND | 0x04)
36#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
37#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
38#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
39#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
40#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
41
42#define TCS3414_CONTROL_ADC_VALID BIT(4)
43#define TCS3414_CONTROL_ADC_EN BIT(1)
44#define TCS3414_CONTROL_POWER BIT(0)
45
46#define TCS3414_INTEG_MASK GENMASK(1, 0)
47#define TCS3414_INTEG_12MS 0x0
48#define TCS3414_INTEG_100MS 0x1
49#define TCS3414_INTEG_400MS 0x2
50
51#define TCS3414_GAIN_MASK GENMASK(5, 4)
52#define TCS3414_GAIN_SHIFT 4
53
54struct tcs3414_data {
55 struct i2c_client *client;
56 u8 control;
57 u8 gain;
58 u8 timing;
59 u16 buffer[8];
60};
61
62#define TCS3414_CHANNEL(_color, _si, _addr) { \
63 .type = IIO_INTENSITY, \
64 .modified = 1, \
65 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
66 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
67 BIT(IIO_CHAN_INFO_INT_TIME), \
68 .channel2 = IIO_MOD_LIGHT_##_color, \
69 .address = _addr, \
70 .scan_index = _si, \
71 .scan_type = { \
72 .sign = 'u', \
73 .realbits = 16, \
74 .storagebits = 16, \
75 .endianness = IIO_CPU, \
76 }, \
77}
78
79
80static const int tcs3414_scales[][2] = {
81 {1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
82};
83
84
85static const int tcs3414_times[] = { 12, 100, 400 };
86
87static const struct iio_chan_spec tcs3414_channels[] = {
88 TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
89 TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
90 TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
91 TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
92 IIO_CHAN_SOFT_TIMESTAMP(4),
93};
94
95static int tcs3414_req_data(struct tcs3414_data *data)
96{
97 int tries = 25;
98 int ret;
99
100 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
101 data->control | TCS3414_CONTROL_ADC_EN);
102 if (ret < 0)
103 return ret;
104
105 while (tries--) {
106 ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
107 if (ret < 0)
108 return ret;
109 if (ret & TCS3414_CONTROL_ADC_VALID)
110 break;
111 msleep(20);
112 }
113
114 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
115 data->control);
116 if (ret < 0)
117 return ret;
118
119 if (tries < 0) {
120 dev_err(&data->client->dev, "data not ready\n");
121 return -EIO;
122 }
123
124 return 0;
125}
126
127static int tcs3414_read_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
129 int *val, int *val2, long mask)
130{
131 struct tcs3414_data *data = iio_priv(indio_dev);
132 int i, ret;
133
134 switch (mask) {
135 case IIO_CHAN_INFO_RAW:
136 ret = iio_device_claim_direct_mode(indio_dev);
137 if (ret)
138 return ret;
139 ret = tcs3414_req_data(data);
140 if (ret < 0) {
141 iio_device_release_direct_mode(indio_dev);
142 return ret;
143 }
144 ret = i2c_smbus_read_word_data(data->client, chan->address);
145 iio_device_release_direct_mode(indio_dev);
146 if (ret < 0)
147 return ret;
148 *val = ret;
149 return IIO_VAL_INT;
150 case IIO_CHAN_INFO_SCALE:
151 i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
152 *val = tcs3414_scales[i][0];
153 *val2 = tcs3414_scales[i][1];
154 return IIO_VAL_INT_PLUS_MICRO;
155 case IIO_CHAN_INFO_INT_TIME:
156 *val = 0;
157 *val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
158 return IIO_VAL_INT_PLUS_MICRO;
159 }
160 return -EINVAL;
161}
162
163static int tcs3414_write_raw(struct iio_dev *indio_dev,
164 struct iio_chan_spec const *chan,
165 int val, int val2, long mask)
166{
167 struct tcs3414_data *data = iio_priv(indio_dev);
168 int i;
169
170 switch (mask) {
171 case IIO_CHAN_INFO_SCALE:
172 for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
173 if (val == tcs3414_scales[i][0] &&
174 val2 == tcs3414_scales[i][1]) {
175 data->gain &= ~TCS3414_GAIN_MASK;
176 data->gain |= i << TCS3414_GAIN_SHIFT;
177 return i2c_smbus_write_byte_data(
178 data->client, TCS3414_GAIN,
179 data->gain);
180 }
181 }
182 return -EINVAL;
183 case IIO_CHAN_INFO_INT_TIME:
184 if (val != 0)
185 return -EINVAL;
186 for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
187 if (val2 == tcs3414_times[i] * 1000) {
188 data->timing &= ~TCS3414_INTEG_MASK;
189 data->timing |= i;
190 return i2c_smbus_write_byte_data(
191 data->client, TCS3414_TIMING,
192 data->timing);
193 }
194 }
195 return -EINVAL;
196 default:
197 return -EINVAL;
198 }
199}
200
201static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
202{
203 struct iio_poll_func *pf = p;
204 struct iio_dev *indio_dev = pf->indio_dev;
205 struct tcs3414_data *data = iio_priv(indio_dev);
206 int i, j = 0;
207
208 for_each_set_bit(i, indio_dev->active_scan_mask,
209 indio_dev->masklength) {
210 int ret = i2c_smbus_read_word_data(data->client,
211 TCS3414_DATA_GREEN + 2*i);
212 if (ret < 0)
213 goto done;
214
215 data->buffer[j++] = ret;
216 }
217
218 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
219 iio_get_time_ns(indio_dev));
220
221done:
222 iio_trigger_notify_done(indio_dev->trig);
223
224 return IRQ_HANDLED;
225}
226
227static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
228static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
229
230static struct attribute *tcs3414_attributes[] = {
231 &iio_const_attr_scale_available.dev_attr.attr,
232 &iio_const_attr_integration_time_available.dev_attr.attr,
233 NULL
234};
235
236static const struct attribute_group tcs3414_attribute_group = {
237 .attrs = tcs3414_attributes,
238};
239
240static const struct iio_info tcs3414_info = {
241 .read_raw = tcs3414_read_raw,
242 .write_raw = tcs3414_write_raw,
243 .attrs = &tcs3414_attribute_group,
244};
245
246static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
247{
248 struct tcs3414_data *data = iio_priv(indio_dev);
249
250 data->control |= TCS3414_CONTROL_ADC_EN;
251 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
252 data->control);
253}
254
255static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
256{
257 struct tcs3414_data *data = iio_priv(indio_dev);
258 int ret;
259
260 ret = iio_triggered_buffer_predisable(indio_dev);
261 if (ret < 0)
262 return ret;
263
264 data->control &= ~TCS3414_CONTROL_ADC_EN;
265 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
266 data->control);
267}
268
269static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
270 .preenable = tcs3414_buffer_preenable,
271 .postenable = &iio_triggered_buffer_postenable,
272 .predisable = tcs3414_buffer_predisable,
273};
274
275static int tcs3414_probe(struct i2c_client *client,
276 const struct i2c_device_id *id)
277{
278 struct tcs3414_data *data;
279 struct iio_dev *indio_dev;
280 int ret;
281
282 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
283 if (indio_dev == NULL)
284 return -ENOMEM;
285
286 data = iio_priv(indio_dev);
287 i2c_set_clientdata(client, indio_dev);
288 data->client = client;
289
290 indio_dev->dev.parent = &client->dev;
291 indio_dev->info = &tcs3414_info;
292 indio_dev->name = TCS3414_DRV_NAME;
293 indio_dev->channels = tcs3414_channels;
294 indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
295 indio_dev->modes = INDIO_DIRECT_MODE;
296
297 ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
298 if (ret < 0)
299 return ret;
300
301 switch (ret & 0xf0) {
302 case 0x00:
303 dev_info(&client->dev, "TCS3404 found\n");
304 break;
305 case 0x10:
306 dev_info(&client->dev, "TCS3413/14/15/16 found\n");
307 break;
308 default:
309 return -ENODEV;
310 }
311
312 data->control = TCS3414_CONTROL_POWER;
313 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
314 data->control);
315 if (ret < 0)
316 return ret;
317
318 data->timing = TCS3414_INTEG_12MS;
319 ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
320 data->timing);
321 if (ret < 0)
322 return ret;
323
324 ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
325 if (ret < 0)
326 return ret;
327 data->gain = ret;
328
329 ret = iio_triggered_buffer_setup(indio_dev, NULL,
330 tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
331 if (ret < 0)
332 return ret;
333
334 ret = iio_device_register(indio_dev);
335 if (ret < 0)
336 goto buffer_cleanup;
337
338 return 0;
339
340buffer_cleanup:
341 iio_triggered_buffer_cleanup(indio_dev);
342 return ret;
343}
344
345static int tcs3414_powerdown(struct tcs3414_data *data)
346{
347 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
348 data->control & ~(TCS3414_CONTROL_POWER |
349 TCS3414_CONTROL_ADC_EN));
350}
351
352static int tcs3414_remove(struct i2c_client *client)
353{
354 struct iio_dev *indio_dev = i2c_get_clientdata(client);
355
356 iio_device_unregister(indio_dev);
357 iio_triggered_buffer_cleanup(indio_dev);
358 tcs3414_powerdown(iio_priv(indio_dev));
359
360 return 0;
361}
362
363#ifdef CONFIG_PM_SLEEP
364static int tcs3414_suspend(struct device *dev)
365{
366 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
367 to_i2c_client(dev)));
368 return tcs3414_powerdown(data);
369}
370
371static int tcs3414_resume(struct device *dev)
372{
373 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
374 to_i2c_client(dev)));
375 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
376 data->control);
377}
378#endif
379
380static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
381
382static const struct i2c_device_id tcs3414_id[] = {
383 { "tcs3414", 0 },
384 { }
385};
386MODULE_DEVICE_TABLE(i2c, tcs3414_id);
387
388static struct i2c_driver tcs3414_driver = {
389 .driver = {
390 .name = TCS3414_DRV_NAME,
391 .pm = &tcs3414_pm_ops,
392 },
393 .probe = tcs3414_probe,
394 .remove = tcs3414_remove,
395 .id_table = tcs3414_id,
396};
397module_i2c_driver(tcs3414_driver);
398
399MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
400MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
401MODULE_LICENSE("GPL");
402
