1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * AD7150 capacitive sensor driver supporting AD7150/1/6
4 *
5 * Copyright 2010-2011 Analog Devices Inc.
6 * Copyright 2021 Jonathan Cameron <Jonathan.Cameron@huawei.com>
7 */
8
9 #include <linux/bitfield.h>
10 #include <linux/device.h>
11 #include <linux/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/i2c.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
19
20 #include <linux/iio/iio.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/events.h>
23
24 #define AD7150_STATUS_REG 0
25 #define AD7150_STATUS_OUT1 BIT(3)
26 #define AD7150_STATUS_OUT2 BIT(5)
27 #define AD7150_CH1_DATA_HIGH_REG 1
28 #define AD7150_CH2_DATA_HIGH_REG 3
29 #define AD7150_CH1_AVG_HIGH_REG 5
30 #define AD7150_CH2_AVG_HIGH_REG 7
31 #define AD7150_CH1_SENSITIVITY_REG 9
32 #define AD7150_CH1_THR_HOLD_H_REG 9
33 #define AD7150_CH1_TIMEOUT_REG 10
34 #define AD7150_CH_TIMEOUT_RECEDING GENMASK(3, 0)
35 #define AD7150_CH_TIMEOUT_APPROACHING GENMASK(7, 4)
36 #define AD7150_CH1_SETUP_REG 11
37 #define AD7150_CH2_SENSITIVITY_REG 12
38 #define AD7150_CH2_THR_HOLD_H_REG 12
39 #define AD7150_CH2_TIMEOUT_REG 13
40 #define AD7150_CH2_SETUP_REG 14
41 #define AD7150_CFG_REG 15
42 #define AD7150_CFG_FIX BIT(7)
43 #define AD7150_CFG_THRESHTYPE_MSK GENMASK(6, 5)
44 #define AD7150_CFG_TT_NEG 0x0
45 #define AD7150_CFG_TT_POS 0x1
46 #define AD7150_CFG_TT_IN_WINDOW 0x2
47 #define AD7150_CFG_TT_OUT_WINDOW 0x3
48 #define AD7150_PD_TIMER_REG 16
49 #define AD7150_CH1_CAPDAC_REG 17
50 #define AD7150_CH2_CAPDAC_REG 18
51 #define AD7150_SN3_REG 19
52 #define AD7150_SN2_REG 20
53 #define AD7150_SN1_REG 21
54 #define AD7150_SN0_REG 22
55 #define AD7150_ID_REG 23
56
57 enum {
58 AD7150,
59 AD7151,
60 };
61
62 /**
63 * struct ad7150_chip_info - instance specific chip data
64 * @client: i2c client for this device
65 * @threshold: thresholds for simple capacitance value events
66 * @thresh_sensitivity: threshold for simple capacitance offset
67 * from 'average' value.
68 * @thresh_timeout: a timeout, in samples from the moment an
69 * adaptive threshold event occurs to when the average
70 * value jumps to current value. Note made up of two fields,
71 * 3:0 are for timeout receding - applies if below lower threshold
72 * 7:4 are for timeout approaching - applies if above upper threshold
73 * @state_lock: ensure consistent state of this structure wrt the
74 * hardware.
75 * @interrupts: one or two interrupt numbers depending on device type.
76 * @int_enabled: is a given interrupt currently enabled.
77 * @type: threshold type
78 * @dir: threshold direction
79 */
80 struct ad7150_chip_info {
81 struct i2c_client *client;
82 u16 threshold[2][2];
83 u8 thresh_sensitivity[2][2];
84 u8 thresh_timeout[2][2];
85 struct mutex state_lock;
86 int interrupts[2];
87 bool int_enabled[2];
88 enum iio_event_type type;
89 enum iio_event_direction dir;
90 };
91
92 static const u8 ad7150_addresses[][6] = {
93 { AD7150_CH1_DATA_HIGH_REG, AD7150_CH1_AVG_HIGH_REG,
94 AD7150_CH1_SETUP_REG, AD7150_CH1_THR_HOLD_H_REG,
95 AD7150_CH1_SENSITIVITY_REG, AD7150_CH1_TIMEOUT_REG },
96 { AD7150_CH2_DATA_HIGH_REG, AD7150_CH2_AVG_HIGH_REG,
97 AD7150_CH2_SETUP_REG, AD7150_CH2_THR_HOLD_H_REG,
98 AD7150_CH2_SENSITIVITY_REG, AD7150_CH2_TIMEOUT_REG },
99 };
100
ad7150_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)101 static int ad7150_read_raw(struct iio_dev *indio_dev,
102 struct iio_chan_spec const *chan,
103 int *val,
104 int *val2,
105 long mask)
106 {
107 struct ad7150_chip_info *chip = iio_priv(indio_dev);
108 int channel = chan->channel;
109 int ret;
110
111 switch (mask) {
112 case IIO_CHAN_INFO_RAW:
113 ret = i2c_smbus_read_word_swapped(chip->client,
114 ad7150_addresses[channel][0]);
115 if (ret < 0)
116 return ret;
117 *val = ret >> 4;
118
119 return IIO_VAL_INT;
120 case IIO_CHAN_INFO_AVERAGE_RAW:
121 ret = i2c_smbus_read_word_swapped(chip->client,
122 ad7150_addresses[channel][1]);
123 if (ret < 0)
124 return ret;
125 *val = ret;
126
127 return IIO_VAL_INT;
128 case IIO_CHAN_INFO_SCALE:
129 /*
130 * Base units for capacitance are nano farads and the value
131 * calculated from the datasheet formula is in picofarad
132 * so multiply by 1000
133 */
134 *val = 1000;
135 *val2 = 40944 >> 4; /* To match shift in _RAW */
136 return IIO_VAL_FRACTIONAL;
137 case IIO_CHAN_INFO_OFFSET:
138 *val = -(12288 >> 4); /* To match shift in _RAW */
139 return IIO_VAL_INT;
140 case IIO_CHAN_INFO_SAMP_FREQ:
141 /* Strangely same for both 1 and 2 chan parts */
142 *val = 100;
143 return IIO_VAL_INT;
144 default:
145 return -EINVAL;
146 }
147 }
148
ad7150_read_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)149 static int ad7150_read_event_config(struct iio_dev *indio_dev,
150 const struct iio_chan_spec *chan,
151 enum iio_event_type type,
152 enum iio_event_direction dir)
153 {
154 struct ad7150_chip_info *chip = iio_priv(indio_dev);
155 u8 threshtype;
156 bool thrfixed;
157 int ret;
158
159 ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG_REG);
160 if (ret < 0)
161 return ret;
162
163 threshtype = FIELD_GET(AD7150_CFG_THRESHTYPE_MSK, ret);
164
165 /*check if threshold mode is fixed or adaptive*/
166 thrfixed = FIELD_GET(AD7150_CFG_FIX, ret);
167
168 switch (type) {
169 case IIO_EV_TYPE_THRESH_ADAPTIVE:
170 if (dir == IIO_EV_DIR_RISING)
171 return !thrfixed && (threshtype == AD7150_CFG_TT_POS);
172 return !thrfixed && (threshtype == AD7150_CFG_TT_NEG);
173 case IIO_EV_TYPE_THRESH:
174 if (dir == IIO_EV_DIR_RISING)
175 return thrfixed && (threshtype == AD7150_CFG_TT_POS);
176 return thrfixed && (threshtype == AD7150_CFG_TT_NEG);
177 default:
178 break;
179 }
180 return -EINVAL;
181 }
182
183 /* state_lock should be held to ensure consistent state */
ad7150_write_event_params(struct iio_dev * indio_dev,unsigned int chan,enum iio_event_type type,enum iio_event_direction dir)184 static int ad7150_write_event_params(struct iio_dev *indio_dev,
185 unsigned int chan,
186 enum iio_event_type type,
187 enum iio_event_direction dir)
188 {
189 struct ad7150_chip_info *chip = iio_priv(indio_dev);
190 int rising = (dir == IIO_EV_DIR_RISING);
191
192 /* Only update value live, if parameter is in use */
193 if ((type != chip->type) || (dir != chip->dir))
194 return 0;
195
196 switch (type) {
197 /* Note completely different from the adaptive versions */
198 case IIO_EV_TYPE_THRESH: {
199 u16 value = chip->threshold[rising][chan];
200 return i2c_smbus_write_word_swapped(chip->client,
201 ad7150_addresses[chan][3],
202 value);
203 }
204 case IIO_EV_TYPE_THRESH_ADAPTIVE: {
205 int ret;
206 u8 sens, timeout;
207
208 sens = chip->thresh_sensitivity[rising][chan];
209 ret = i2c_smbus_write_byte_data(chip->client,
210 ad7150_addresses[chan][4],
211 sens);
212 if (ret)
213 return ret;
214
215 /*
216 * Single timeout register contains timeouts for both
217 * directions.
218 */
219 timeout = FIELD_PREP(AD7150_CH_TIMEOUT_APPROACHING,
220 chip->thresh_timeout[1][chan]);
221 timeout |= FIELD_PREP(AD7150_CH_TIMEOUT_RECEDING,
222 chip->thresh_timeout[0][chan]);
223 return i2c_smbus_write_byte_data(chip->client,
224 ad7150_addresses[chan][5],
225 timeout);
226 }
227 default:
228 return -EINVAL;
229 }
230 }
231
ad7150_write_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)232 static int ad7150_write_event_config(struct iio_dev *indio_dev,
233 const struct iio_chan_spec *chan,
234 enum iio_event_type type,
235 enum iio_event_direction dir, int state)
236 {
237 struct ad7150_chip_info *chip = iio_priv(indio_dev);
238 int ret = 0;
239
240 /*
241 * There is only a single shared control and no on chip
242 * interrupt disables for the two interrupt lines.
243 * So, enabling will switch the events configured to enable
244 * whatever was most recently requested and if necessary enable_irq()
245 * the interrupt and any disable will disable_irq() for that
246 * channels interrupt.
247 */
248 if (!state) {
249 if ((chip->int_enabled[chan->channel]) &&
250 (type == chip->type) && (dir == chip->dir)) {
251 disable_irq(chip->interrupts[chan->channel]);
252 chip->int_enabled[chan->channel] = false;
253 }
254 return 0;
255 }
256
257 mutex_lock(&chip->state_lock);
258 if ((type != chip->type) || (dir != chip->dir)) {
259 int rising = (dir == IIO_EV_DIR_RISING);
260 u8 thresh_type, cfg, fixed;
261
262 /*
263 * Need to temporarily disable both interrupts if
264 * enabled - this is to avoid races around changing
265 * config and thresholds.
266 * Note enable/disable_irq() are reference counted so
267 * no need to check if already enabled.
268 */
269 disable_irq(chip->interrupts[0]);
270 disable_irq(chip->interrupts[1]);
271
272 ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG_REG);
273 if (ret < 0)
274 goto error_ret;
275
276 cfg = ret & ~(AD7150_CFG_THRESHTYPE_MSK | AD7150_CFG_FIX);
277
278 if (type == IIO_EV_TYPE_THRESH_ADAPTIVE)
279 fixed = 0;
280 else
281 fixed = 1;
282
283 if (rising)
284 thresh_type = AD7150_CFG_TT_POS;
285 else
286 thresh_type = AD7150_CFG_TT_NEG;
287
288 cfg |= FIELD_PREP(AD7150_CFG_FIX, fixed) |
289 FIELD_PREP(AD7150_CFG_THRESHTYPE_MSK, thresh_type);
290
291 ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG_REG,
292 cfg);
293 if (ret < 0)
294 goto error_ret;
295
296 /*
297 * There is a potential race condition here, but not easy
298 * to close given we can't disable the interrupt at the
299 * chip side of things. Rely on the status bit.
300 */
301 chip->type = type;
302 chip->dir = dir;
303
304 /* update control attributes */
305 ret = ad7150_write_event_params(indio_dev, chan->channel, type,
306 dir);
307 if (ret)
308 goto error_ret;
309 /* reenable any irq's we disabled whilst changing mode */
310 enable_irq(chip->interrupts[0]);
311 enable_irq(chip->interrupts[1]);
312 }
313 if (!chip->int_enabled[chan->channel]) {
314 enable_irq(chip->interrupts[chan->channel]);
315 chip->int_enabled[chan->channel] = true;
316 }
317
318 error_ret:
319 mutex_unlock(&chip->state_lock);
320
321 return ret;
322 }
323
ad7150_read_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)324 static int ad7150_read_event_value(struct iio_dev *indio_dev,
325 const struct iio_chan_spec *chan,
326 enum iio_event_type type,
327 enum iio_event_direction dir,
328 enum iio_event_info info,
329 int *val, int *val2)
330 {
331 struct ad7150_chip_info *chip = iio_priv(indio_dev);
332 int rising = (dir == IIO_EV_DIR_RISING);
333
334 /* Complex register sharing going on here */
335 switch (info) {
336 case IIO_EV_INFO_VALUE:
337 switch (type) {
338 case IIO_EV_TYPE_THRESH_ADAPTIVE:
339 *val = chip->thresh_sensitivity[rising][chan->channel];
340 return IIO_VAL_INT;
341 case IIO_EV_TYPE_THRESH:
342 *val = chip->threshold[rising][chan->channel];
343 return IIO_VAL_INT;
344 default:
345 return -EINVAL;
346 }
347 case IIO_EV_INFO_TIMEOUT:
348 *val = 0;
349 *val2 = chip->thresh_timeout[rising][chan->channel] * 10000;
350 return IIO_VAL_INT_PLUS_MICRO;
351 default:
352 return -EINVAL;
353 }
354 }
355
ad7150_write_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)356 static int ad7150_write_event_value(struct iio_dev *indio_dev,
357 const struct iio_chan_spec *chan,
358 enum iio_event_type type,
359 enum iio_event_direction dir,
360 enum iio_event_info info,
361 int val, int val2)
362 {
363 int ret;
364 struct ad7150_chip_info *chip = iio_priv(indio_dev);
365 int rising = (dir == IIO_EV_DIR_RISING);
366
367 mutex_lock(&chip->state_lock);
368 switch (info) {
369 case IIO_EV_INFO_VALUE:
370 switch (type) {
371 case IIO_EV_TYPE_THRESH_ADAPTIVE:
372 chip->thresh_sensitivity[rising][chan->channel] = val;
373 break;
374 case IIO_EV_TYPE_THRESH:
375 chip->threshold[rising][chan->channel] = val;
376 break;
377 default:
378 ret = -EINVAL;
379 goto error_ret;
380 }
381 break;
382 case IIO_EV_INFO_TIMEOUT: {
383 /*
384 * Raw timeout is in cycles of 10 msecs as long as both
385 * channels are enabled.
386 * In terms of INT_PLUS_MICRO, that is in units of 10,000
387 */
388 int timeout = val2 / 10000;
389
390 if (val != 0 || timeout < 0 || timeout > 15 || val2 % 10000) {
391 ret = -EINVAL;
392 goto error_ret;
393 }
394
395 chip->thresh_timeout[rising][chan->channel] = timeout;
396 break;
397 }
398 default:
399 ret = -EINVAL;
400 goto error_ret;
401 }
402
403 /* write back if active */
404 ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir);
405
406 error_ret:
407 mutex_unlock(&chip->state_lock);
408 return ret;
409 }
410
411 static const struct iio_event_spec ad7150_events[] = {
412 {
413 .type = IIO_EV_TYPE_THRESH,
414 .dir = IIO_EV_DIR_RISING,
415 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
416 BIT(IIO_EV_INFO_ENABLE),
417 }, {
418 .type = IIO_EV_TYPE_THRESH,
419 .dir = IIO_EV_DIR_FALLING,
420 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
421 BIT(IIO_EV_INFO_ENABLE),
422 }, {
423 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
424 .dir = IIO_EV_DIR_RISING,
425 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
426 BIT(IIO_EV_INFO_ENABLE) |
427 BIT(IIO_EV_INFO_TIMEOUT),
428 }, {
429 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
430 .dir = IIO_EV_DIR_FALLING,
431 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
432 BIT(IIO_EV_INFO_ENABLE) |
433 BIT(IIO_EV_INFO_TIMEOUT),
434 },
435 };
436
437 #define AD7150_CAPACITANCE_CHAN(_chan) { \
438 .type = IIO_CAPACITANCE, \
439 .indexed = 1, \
440 .channel = _chan, \
441 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
442 BIT(IIO_CHAN_INFO_AVERAGE_RAW), \
443 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
444 BIT(IIO_CHAN_INFO_OFFSET), \
445 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
446 .event_spec = ad7150_events, \
447 .num_event_specs = ARRAY_SIZE(ad7150_events), \
448 }
449
450 #define AD7150_CAPACITANCE_CHAN_NO_IRQ(_chan) { \
451 .type = IIO_CAPACITANCE, \
452 .indexed = 1, \
453 .channel = _chan, \
454 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
455 BIT(IIO_CHAN_INFO_AVERAGE_RAW), \
456 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
457 BIT(IIO_CHAN_INFO_OFFSET), \
458 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
459 }
460
461 static const struct iio_chan_spec ad7150_channels[] = {
462 AD7150_CAPACITANCE_CHAN(0),
463 AD7150_CAPACITANCE_CHAN(1),
464 };
465
466 static const struct iio_chan_spec ad7150_channels_no_irq[] = {
467 AD7150_CAPACITANCE_CHAN_NO_IRQ(0),
468 AD7150_CAPACITANCE_CHAN_NO_IRQ(1),
469 };
470
471 static const struct iio_chan_spec ad7151_channels[] = {
472 AD7150_CAPACITANCE_CHAN(0),
473 };
474
475 static const struct iio_chan_spec ad7151_channels_no_irq[] = {
476 AD7150_CAPACITANCE_CHAN_NO_IRQ(0),
477 };
478
__ad7150_event_handler(void * private,u8 status_mask,int channel)479 static irqreturn_t __ad7150_event_handler(void *private, u8 status_mask,
480 int channel)
481 {
482 struct iio_dev *indio_dev = private;
483 struct ad7150_chip_info *chip = iio_priv(indio_dev);
484 s64 timestamp = iio_get_time_ns(indio_dev);
485 int int_status;
486
487 int_status = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS_REG);
488 if (int_status < 0)
489 return IRQ_HANDLED;
490
491 if (!(int_status & status_mask))
492 return IRQ_HANDLED;
493
494 iio_push_event(indio_dev,
495 IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, channel,
496 chip->type, chip->dir),
497 timestamp);
498
499 return IRQ_HANDLED;
500 }
501
ad7150_event_handler_ch1(int irq,void * private)502 static irqreturn_t ad7150_event_handler_ch1(int irq, void *private)
503 {
504 return __ad7150_event_handler(private, AD7150_STATUS_OUT1, 0);
505 }
506
ad7150_event_handler_ch2(int irq,void * private)507 static irqreturn_t ad7150_event_handler_ch2(int irq, void *private)
508 {
509 return __ad7150_event_handler(private, AD7150_STATUS_OUT2, 1);
510 }
511
512 static IIO_CONST_ATTR(in_capacitance_thresh_adaptive_timeout_available,
513 "[0 0.01 0.15]");
514
515 static struct attribute *ad7150_event_attributes[] = {
516 &iio_const_attr_in_capacitance_thresh_adaptive_timeout_available
517 .dev_attr.attr,
518 NULL,
519 };
520
521 static const struct attribute_group ad7150_event_attribute_group = {
522 .attrs = ad7150_event_attributes,
523 .name = "events",
524 };
525
526 static const struct iio_info ad7150_info = {
527 .event_attrs = &ad7150_event_attribute_group,
528 .read_raw = &ad7150_read_raw,
529 .read_event_config = &ad7150_read_event_config,
530 .write_event_config = &ad7150_write_event_config,
531 .read_event_value = &ad7150_read_event_value,
532 .write_event_value = &ad7150_write_event_value,
533 };
534
535 static const struct iio_info ad7150_info_no_irq = {
536 .read_raw = &ad7150_read_raw,
537 };
538
ad7150_probe(struct i2c_client * client)539 static int ad7150_probe(struct i2c_client *client)
540 {
541 const struct i2c_device_id *id = i2c_client_get_device_id(client);
542 struct ad7150_chip_info *chip;
543 struct iio_dev *indio_dev;
544 bool use_irq = true;
545 int ret;
546
547 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
548 if (!indio_dev)
549 return -ENOMEM;
550
551 chip = iio_priv(indio_dev);
552 mutex_init(&chip->state_lock);
553 chip->client = client;
554
555 indio_dev->name = id->name;
556
557 indio_dev->modes = INDIO_DIRECT_MODE;
558
559 ret = devm_regulator_get_enable(&client->dev, "vdd");
560 if (ret)
561 return ret;
562
563 chip->interrupts[0] = fwnode_irq_get(dev_fwnode(&client->dev), 0);
564 if (chip->interrupts[0] < 0)
565 use_irq = false;
566 else if (id->driver_data == AD7150) {
567 chip->interrupts[1] = fwnode_irq_get(dev_fwnode(&client->dev), 1);
568 if (chip->interrupts[1] < 0)
569 use_irq = false;
570 }
571 if (use_irq) {
572 irq_set_status_flags(chip->interrupts[0], IRQ_NOAUTOEN);
573 ret = devm_request_threaded_irq(&client->dev,
574 chip->interrupts[0],
575 NULL,
576 &ad7150_event_handler_ch1,
577 IRQF_TRIGGER_RISING |
578 IRQF_ONESHOT,
579 "ad7150_irq1",
580 indio_dev);
581 if (ret)
582 return ret;
583
584 indio_dev->info = &ad7150_info;
585 switch (id->driver_data) {
586 case AD7150:
587 indio_dev->channels = ad7150_channels;
588 indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
589 irq_set_status_flags(chip->interrupts[1], IRQ_NOAUTOEN);
590 ret = devm_request_threaded_irq(&client->dev,
591 chip->interrupts[1],
592 NULL,
593 &ad7150_event_handler_ch2,
594 IRQF_TRIGGER_RISING |
595 IRQF_ONESHOT,
596 "ad7150_irq2",
597 indio_dev);
598 if (ret)
599 return ret;
600 break;
601 case AD7151:
602 indio_dev->channels = ad7151_channels;
603 indio_dev->num_channels = ARRAY_SIZE(ad7151_channels);
604 break;
605 default:
606 return -EINVAL;
607 }
608
609 } else {
610 indio_dev->info = &ad7150_info_no_irq;
611 switch (id->driver_data) {
612 case AD7150:
613 indio_dev->channels = ad7150_channels_no_irq;
614 indio_dev->num_channels =
615 ARRAY_SIZE(ad7150_channels_no_irq);
616 break;
617 case AD7151:
618 indio_dev->channels = ad7151_channels_no_irq;
619 indio_dev->num_channels =
620 ARRAY_SIZE(ad7151_channels_no_irq);
621 break;
622 default:
623 return -EINVAL;
624 }
625 }
626
627 return devm_iio_device_register(indio_dev->dev.parent, indio_dev);
628 }
629
630 static const struct i2c_device_id ad7150_id[] = {
631 { "ad7150", AD7150 },
632 { "ad7151", AD7151 },
633 { "ad7156", AD7150 },
634 {}
635 };
636
637 MODULE_DEVICE_TABLE(i2c, ad7150_id);
638
639 static const struct of_device_id ad7150_of_match[] = {
640 { "adi,ad7150" },
641 { "adi,ad7151" },
642 { "adi,ad7156" },
643 {}
644 };
645 static struct i2c_driver ad7150_driver = {
646 .driver = {
647 .name = "ad7150",
648 .of_match_table = ad7150_of_match,
649 },
650 .probe = ad7150_probe,
651 .id_table = ad7150_id,
652 };
653 module_i2c_driver(ad7150_driver);
654
655 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
656 MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
657 MODULE_LICENSE("GPL v2");
658