1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Texas Instruments ADS1119 ADC driver.
4 *
5 * Copyright 2024 Toradex
6 */
7
8 #include <linux/bits.h>
9 #include <linux/bitfield.h>
10 #include <linux/completion.h>
11 #include <linux/delay.h>
12 #include <linux/dev_printk.h>
13 #include <linux/err.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/interrupt.h>
16 #include <linux/iopoll.h>
17 #include <linux/i2c.h>
18 #include <linux/kernel.h>
19 #include <linux/math.h>
20 #include <linux/module.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/units.h>
24
25 #include <linux/iio/iio.h>
26 #include <linux/iio/buffer.h>
27 #include <linux/iio/trigger.h>
28 #include <linux/iio/triggered_buffer.h>
29 #include <linux/iio/trigger_consumer.h>
30
31 #define ADS1119_CMD_RESET 0x06
32 #define ADS1119_CMD_POWERDOWN 0x02
33 #define ADS1119_CMD_START_SYNC 0x08
34 #define ADS1119_CMD_RDATA 0x10
35 #define ADS1119_CMD_RREG_CONFIG 0x20
36 #define ADS1119_CMD_RREG_STATUS 0x24
37 #define ADS1119_CMD_WREG 0x40
38
39 #define ADS1119_CMD_RREG(reg) (0x20 | (reg) << 2)
40
41 /* Config register */
42 #define ADS1119_REG_CONFIG 0x00
43 #define ADS1119_CONFIG_VREF_FIELD BIT(0)
44 #define ADS1119_CONFIG_CM_FIELD BIT(1)
45 #define ADS1119_CONFIG_DR_FIELD GENMASK(3, 2)
46 #define ADS1119_CONFIG_GAIN_FIELD BIT(4)
47 #define ADS1119_CONFIG_MUX_FIELD GENMASK(7, 5)
48
49 #define ADS1119_VREF_INTERNAL 0
50 #define ADS1119_VREF_EXTERNAL 1
51 #define ADS1119_VREF_INTERNAL_VAL 2048000
52
53 #define ADS1119_CM_SINGLE 0
54 #define ADS1119_CM_CONTINUOUS 1
55
56 #define ADS1119_DR_20_SPS 0
57 #define ADS1119_DR_90_SPS 1
58 #define ADS1119_DR_330_SPS 2
59 #define ADS1119_DR_1000_SPS 3
60
61 #define ADS1119_GAIN_1 0
62 #define ADS1119_GAIN_4 1
63
64 #define ADS1119_MUX_AIN0_AIN1 0
65 #define ADS1119_MUX_AIN2_AIN3 1
66 #define ADS1119_MUX_AIN1_AIN2 2
67 #define ADS1119_MUX_AIN0 3
68 #define ADS1119_MUX_AIN1 4
69 #define ADS1119_MUX_AIN2 5
70 #define ADS1119_MUX_AIN3 6
71 #define ADS1119_MUX_SHORTED 7
72
73 /* Status register */
74 #define ADS1119_REG_STATUS 0x01
75 #define ADS1119_STATUS_DRDY_FIELD BIT(7)
76
77 #define ADS1119_DEFAULT_GAIN 1
78 #define ADS1119_DEFAULT_DATARATE 20
79
80 #define ADS1119_SUSPEND_DELAY 2000
81
82 /* Timeout based on the minimum sample rate of 20 SPS (50000us) */
83 #define ADS1119_MAX_DRDY_TIMEOUT 85000
84
85 #define ADS1119_MAX_CHANNELS 7
86 #define ADS1119_MAX_SINGLE_CHANNELS 4
87
88 struct ads1119_channel_config {
89 int gain;
90 int datarate;
91 int mux;
92 };
93
94 struct ads1119_state {
95 struct completion completion;
96 struct i2c_client *client;
97 struct gpio_desc *reset_gpio;
98 struct iio_trigger *trig;
99 struct ads1119_channel_config *channels_cfg;
100 unsigned int num_channels_cfg;
101 unsigned int cached_config;
102 int vref_uV;
103 };
104
105 static const char * const ads1119_power_supplies[] = {
106 "avdd", "dvdd"
107 };
108
109 static const int ads1119_available_datarates[] = {
110 20, 90, 330, 1000,
111 };
112
113 static const int ads1119_available_gains[] = {
114 1, 1,
115 1, 4,
116 };
117
ads1119_upd_cfg_reg(struct ads1119_state * st,unsigned int fields,unsigned int val)118 static int ads1119_upd_cfg_reg(struct ads1119_state *st, unsigned int fields,
119 unsigned int val)
120 {
121 unsigned int config = st->cached_config;
122 int ret;
123
124 config &= ~fields;
125 config |= val;
126
127 ret = i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG, config);
128 if (ret)
129 return ret;
130
131 st->cached_config = config;
132
133 return 0;
134 }
135
ads1119_data_ready(struct ads1119_state * st)136 static bool ads1119_data_ready(struct ads1119_state *st)
137 {
138 int status;
139
140 status = i2c_smbus_read_byte_data(st->client, ADS1119_CMD_RREG_STATUS);
141 if (status < 0)
142 return false;
143
144 return FIELD_GET(ADS1119_STATUS_DRDY_FIELD, status);
145 }
146
ads1119_reset(struct ads1119_state * st)147 static int ads1119_reset(struct ads1119_state *st)
148 {
149 st->cached_config = 0;
150
151 if (!st->reset_gpio)
152 return i2c_smbus_write_byte(st->client, ADS1119_CMD_RESET);
153
154 gpiod_set_value_cansleep(st->reset_gpio, 1);
155 udelay(1);
156 gpiod_set_value_cansleep(st->reset_gpio, 0);
157 udelay(1);
158
159 return 0;
160 }
161
ads1119_set_conv_mode(struct ads1119_state * st,bool continuous)162 static int ads1119_set_conv_mode(struct ads1119_state *st, bool continuous)
163 {
164 unsigned int mode;
165
166 if (continuous)
167 mode = ADS1119_CM_CONTINUOUS;
168 else
169 mode = ADS1119_CM_SINGLE;
170
171 return ads1119_upd_cfg_reg(st, ADS1119_CONFIG_CM_FIELD,
172 FIELD_PREP(ADS1119_CONFIG_CM_FIELD, mode));
173 }
174
ads1119_get_hw_gain(int gain)175 static int ads1119_get_hw_gain(int gain)
176 {
177 if (gain == 4)
178 return ADS1119_GAIN_4;
179 else
180 return ADS1119_GAIN_1;
181 }
182
ads1119_get_hw_datarate(int datarate)183 static int ads1119_get_hw_datarate(int datarate)
184 {
185 switch (datarate) {
186 case 90:
187 return ADS1119_DR_90_SPS;
188 case 330:
189 return ADS1119_DR_330_SPS;
190 case 1000:
191 return ADS1119_DR_1000_SPS;
192 case 20:
193 default:
194 return ADS1119_DR_20_SPS;
195 }
196 }
197
ads1119_configure_channel(struct ads1119_state * st,int mux,int gain,int datarate)198 static int ads1119_configure_channel(struct ads1119_state *st, int mux,
199 int gain, int datarate)
200 {
201 int ret;
202
203 ret = ads1119_upd_cfg_reg(st, ADS1119_CONFIG_MUX_FIELD,
204 FIELD_PREP(ADS1119_CONFIG_MUX_FIELD, mux));
205 if (ret)
206 return ret;
207
208 ret = ads1119_upd_cfg_reg(st, ADS1119_CONFIG_GAIN_FIELD,
209 FIELD_PREP(ADS1119_CONFIG_GAIN_FIELD,
210 ads1119_get_hw_gain(gain)));
211 if (ret)
212 return ret;
213
214 return ads1119_upd_cfg_reg(st, ADS1119_CONFIG_DR_FIELD,
215 FIELD_PREP(ADS1119_CONFIG_DR_FIELD,
216 ads1119_get_hw_datarate(datarate)));
217 }
218
ads1119_poll_data_ready(struct ads1119_state * st,struct iio_chan_spec const * chan)219 static int ads1119_poll_data_ready(struct ads1119_state *st,
220 struct iio_chan_spec const *chan)
221 {
222 unsigned int datarate = st->channels_cfg[chan->address].datarate;
223 unsigned long wait_time;
224 bool data_ready;
225
226 /* Poll 5 times more than the data rate */
227 wait_time = DIV_ROUND_CLOSEST(MICRO, 5 * datarate);
228
229 return read_poll_timeout(ads1119_data_ready, data_ready,
230 data_ready, wait_time,
231 ADS1119_MAX_DRDY_TIMEOUT, false, st);
232 }
233
ads1119_read_data(struct ads1119_state * st,struct iio_chan_spec const * chan,unsigned int * val)234 static int ads1119_read_data(struct ads1119_state *st,
235 struct iio_chan_spec const *chan,
236 unsigned int *val)
237 {
238 unsigned int timeout;
239 int ret = 0;
240
241 timeout = msecs_to_jiffies(ADS1119_MAX_DRDY_TIMEOUT);
242
243 if (!st->client->irq) {
244 ret = ads1119_poll_data_ready(st, chan);
245 if (ret)
246 return ret;
247 } else if (!wait_for_completion_timeout(&st->completion, timeout)) {
248 return -ETIMEDOUT;
249 }
250
251 ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA);
252 if (ret < 0)
253 return ret;
254
255 *val = ret;
256
257 return 0;
258 }
259
ads1119_single_conversion(struct ads1119_state * st,struct iio_chan_spec const * chan,int * val,bool calib_offset)260 static int ads1119_single_conversion(struct ads1119_state *st,
261 struct iio_chan_spec const *chan,
262 int *val,
263 bool calib_offset)
264 {
265 struct device *dev = &st->client->dev;
266 int mux = st->channels_cfg[chan->address].mux;
267 int gain = st->channels_cfg[chan->address].gain;
268 int datarate = st->channels_cfg[chan->address].datarate;
269 unsigned int sample;
270 int ret;
271
272 if (calib_offset)
273 mux = ADS1119_MUX_SHORTED;
274
275 ret = pm_runtime_resume_and_get(dev);
276 if (ret)
277 return ret;
278
279 ret = ads1119_configure_channel(st, mux, gain, datarate);
280 if (ret)
281 goto pdown;
282
283 if (st->client->irq)
284 reinit_completion(&st->completion);
285
286 ret = i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC);
287 if (ret)
288 goto pdown;
289
290 ret = ads1119_read_data(st, chan, &sample);
291 if (ret)
292 goto pdown;
293
294 *val = sign_extend32(sample, chan->scan_type.realbits - 1);
295 ret = IIO_VAL_INT;
296 pdown:
297 pm_runtime_put_autosuspend(dev);
298 return ret;
299 }
300
ads1119_validate_datarate(struct ads1119_state * st,int datarate)301 static int ads1119_validate_datarate(struct ads1119_state *st, int datarate)
302 {
303 switch (datarate) {
304 case 20:
305 case 90:
306 case 330:
307 case 1000:
308 return datarate;
309 default:
310 return -EINVAL;
311 }
312 }
313
ads1119_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)314 static int ads1119_read_avail(struct iio_dev *indio_dev,
315 struct iio_chan_spec const *chan,
316 const int **vals, int *type, int *length,
317 long mask)
318 {
319 switch (mask) {
320 case IIO_CHAN_INFO_SCALE:
321 *type = IIO_VAL_FRACTIONAL;
322 *vals = ads1119_available_gains;
323 *length = ARRAY_SIZE(ads1119_available_gains);
324 return IIO_AVAIL_LIST;
325 case IIO_CHAN_INFO_SAMP_FREQ:
326 *type = IIO_VAL_INT;
327 *vals = ads1119_available_datarates;
328 *length = ARRAY_SIZE(ads1119_available_datarates);
329 return IIO_AVAIL_LIST;
330 default:
331 return -EINVAL;
332 }
333 }
334
ads1119_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)335 static int ads1119_read_raw(struct iio_dev *indio_dev,
336 struct iio_chan_spec const *chan, int *val,
337 int *val2, long mask)
338 {
339 struct ads1119_state *st = iio_priv(indio_dev);
340 unsigned int index = chan->address;
341 int ret;
342
343 if (index >= st->num_channels_cfg)
344 return -EINVAL;
345
346 switch (mask) {
347 case IIO_CHAN_INFO_RAW:
348 if (!iio_device_claim_direct(indio_dev))
349 return -EBUSY;
350 ret = ads1119_single_conversion(st, chan, val, false);
351 iio_device_release_direct(indio_dev);
352 return ret;
353 case IIO_CHAN_INFO_OFFSET:
354 if (!iio_device_claim_direct(indio_dev))
355 return -EBUSY;
356 ret = ads1119_single_conversion(st, chan, val, true);
357 iio_device_release_direct(indio_dev);
358 return ret;
359 case IIO_CHAN_INFO_SCALE:
360 *val = st->vref_uV / 1000;
361 *val /= st->channels_cfg[index].gain;
362 *val2 = chan->scan_type.realbits - 1;
363 return IIO_VAL_FRACTIONAL_LOG2;
364 case IIO_CHAN_INFO_SAMP_FREQ:
365 *val = st->channels_cfg[index].datarate;
366 return IIO_VAL_INT;
367 default:
368 return -EINVAL;
369 }
370 }
371
ads1119_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)372 static int ads1119_write_raw(struct iio_dev *indio_dev,
373 struct iio_chan_spec const *chan, int val,
374 int val2, long mask)
375 {
376 struct ads1119_state *st = iio_priv(indio_dev);
377 unsigned int index = chan->address;
378 int ret;
379
380 if (index >= st->num_channels_cfg)
381 return -EINVAL;
382
383 switch (mask) {
384 case IIO_CHAN_INFO_SCALE:
385 ret = MICRO / ((val * MICRO) + val2);
386 if (ret != 1 && ret != 4)
387 return -EINVAL;
388
389 st->channels_cfg[index].gain = ret;
390 return 0;
391 case IIO_CHAN_INFO_SAMP_FREQ:
392 ret = ads1119_validate_datarate(st, val);
393 if (ret < 0)
394 return ret;
395
396 st->channels_cfg[index].datarate = ret;
397 return 0;
398 default:
399 return -EINVAL;
400 }
401 }
402
ads1119_debugfs_reg_access(struct iio_dev * indio_dev,unsigned int reg,unsigned int writeval,unsigned int * readval)403 static int ads1119_debugfs_reg_access(struct iio_dev *indio_dev,
404 unsigned int reg, unsigned int writeval,
405 unsigned int *readval)
406 {
407 struct ads1119_state *st = iio_priv(indio_dev);
408 int ret;
409
410 if (reg > ADS1119_REG_STATUS)
411 return -EINVAL;
412
413 if (readval) {
414 ret = i2c_smbus_read_byte_data(st->client,
415 ADS1119_CMD_RREG(reg));
416 if (ret < 0)
417 return ret;
418
419 *readval = ret;
420 return 0;
421 }
422
423 if (reg > ADS1119_REG_CONFIG)
424 return -EINVAL;
425
426 return i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG,
427 writeval);
428 }
429
430 static const struct iio_info ads1119_info = {
431 .read_avail = ads1119_read_avail,
432 .read_raw = ads1119_read_raw,
433 .write_raw = ads1119_write_raw,
434 .debugfs_reg_access = ads1119_debugfs_reg_access,
435 };
436
ads1119_triggered_buffer_preenable(struct iio_dev * indio_dev)437 static int ads1119_triggered_buffer_preenable(struct iio_dev *indio_dev)
438 {
439 struct ads1119_state *st = iio_priv(indio_dev);
440 struct device *dev = &st->client->dev;
441 unsigned int index;
442 int ret;
443
444 index = find_first_bit(indio_dev->active_scan_mask,
445 iio_get_masklength(indio_dev));
446
447 ret = ads1119_set_conv_mode(st, true);
448 if (ret)
449 return ret;
450
451 ret = ads1119_configure_channel(st,
452 st->channels_cfg[index].mux,
453 st->channels_cfg[index].gain,
454 st->channels_cfg[index].datarate);
455 if (ret)
456 return ret;
457
458 ret = pm_runtime_resume_and_get(dev);
459 if (ret)
460 return ret;
461
462 ret = i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC);
463 if (ret)
464 pm_runtime_put_autosuspend(dev);
465
466 return ret;
467 }
468
ads1119_triggered_buffer_postdisable(struct iio_dev * indio_dev)469 static int ads1119_triggered_buffer_postdisable(struct iio_dev *indio_dev)
470 {
471 struct ads1119_state *st = iio_priv(indio_dev);
472 struct device *dev = &st->client->dev;
473 int ret;
474
475 ret = ads1119_set_conv_mode(st, false);
476 if (ret)
477 return ret;
478
479 pm_runtime_put_autosuspend(dev);
480
481 return 0;
482 }
483
484 static const struct iio_buffer_setup_ops ads1119_buffer_setup_ops = {
485 .preenable = ads1119_triggered_buffer_preenable,
486 .postdisable = ads1119_triggered_buffer_postdisable,
487 .validate_scan_mask = &iio_validate_scan_mask_onehot,
488 };
489
490 static const struct iio_trigger_ops ads1119_trigger_ops = {
491 .validate_device = &iio_trigger_validate_own_device,
492 };
493
ads1119_irq_handler(int irq,void * dev_id)494 static irqreturn_t ads1119_irq_handler(int irq, void *dev_id)
495 {
496 struct iio_dev *indio_dev = dev_id;
497 struct ads1119_state *st = iio_priv(indio_dev);
498
499 if (iio_buffer_enabled(indio_dev) && iio_trigger_using_own(indio_dev))
500 iio_trigger_poll(indio_dev->trig);
501 else
502 complete(&st->completion);
503
504 return IRQ_HANDLED;
505 }
506
ads1119_trigger_handler(int irq,void * private)507 static irqreturn_t ads1119_trigger_handler(int irq, void *private)
508 {
509 struct iio_poll_func *pf = private;
510 struct iio_dev *indio_dev = pf->indio_dev;
511 struct ads1119_state *st = iio_priv(indio_dev);
512 struct {
513 s16 sample;
514 aligned_s64 timestamp;
515 } scan = { };
516 unsigned int index;
517 int ret;
518
519 if (!iio_trigger_using_own(indio_dev)) {
520 index = find_first_bit(indio_dev->active_scan_mask,
521 iio_get_masklength(indio_dev));
522
523 ret = ads1119_poll_data_ready(st, &indio_dev->channels[index]);
524 if (ret) {
525 dev_err(&st->client->dev,
526 "Failed to poll data on trigger (%d)\n", ret);
527 goto done;
528 }
529 }
530
531 ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA);
532 if (ret < 0) {
533 dev_err(&st->client->dev,
534 "Failed to read data on trigger (%d)\n", ret);
535 goto done;
536 }
537
538 scan.sample = ret;
539
540 iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan),
541 iio_get_time_ns(indio_dev));
542 done:
543 iio_trigger_notify_done(indio_dev->trig);
544 return IRQ_HANDLED;
545 }
546
ads1119_init(struct ads1119_state * st,bool vref_external)547 static int ads1119_init(struct ads1119_state *st, bool vref_external)
548 {
549 int ret;
550
551 ret = ads1119_reset(st);
552 if (ret)
553 return ret;
554
555 if (vref_external)
556 return ads1119_upd_cfg_reg(st,
557 ADS1119_CONFIG_VREF_FIELD,
558 FIELD_PREP(ADS1119_CONFIG_VREF_FIELD,
559 ADS1119_VREF_EXTERNAL));
560 return 0;
561 }
562
ads1119_map_analog_inputs_mux(int ain_pos,int ain_neg,bool differential)563 static int ads1119_map_analog_inputs_mux(int ain_pos, int ain_neg,
564 bool differential)
565 {
566 if (ain_pos >= ADS1119_MAX_SINGLE_CHANNELS)
567 return -EINVAL;
568
569 if (!differential)
570 return ADS1119_MUX_AIN0 + ain_pos;
571
572 if (ain_pos == 0 && ain_neg == 1)
573 return ADS1119_MUX_AIN0_AIN1;
574 else if (ain_pos == 1 && ain_neg == 2)
575 return ADS1119_MUX_AIN1_AIN2;
576 else if (ain_pos == 2 && ain_neg == 3)
577 return ADS1119_MUX_AIN2_AIN3;
578
579 return -EINVAL;
580 }
581
ads1119_alloc_and_config_channels(struct iio_dev * indio_dev)582 static int ads1119_alloc_and_config_channels(struct iio_dev *indio_dev)
583 {
584 const struct iio_chan_spec ads1119_channel =
585 (const struct iio_chan_spec) {
586 .type = IIO_VOLTAGE,
587 .indexed = 1,
588 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
589 BIT(IIO_CHAN_INFO_SCALE) |
590 BIT(IIO_CHAN_INFO_OFFSET) |
591 BIT(IIO_CHAN_INFO_SAMP_FREQ),
592 .info_mask_shared_by_all_available =
593 BIT(IIO_CHAN_INFO_SCALE) |
594 BIT(IIO_CHAN_INFO_SAMP_FREQ),
595 .scan_type = {
596 .sign = 's',
597 .realbits = 16,
598 .storagebits = 16,
599 .endianness = IIO_CPU,
600 },
601 };
602 const struct iio_chan_spec ads1119_ts = IIO_CHAN_SOFT_TIMESTAMP(0);
603 struct ads1119_state *st = iio_priv(indio_dev);
604 struct iio_chan_spec *iio_channels, *chan;
605 struct device *dev = &st->client->dev;
606 unsigned int num_channels, i;
607 bool differential;
608 u32 ain[2];
609 int ret;
610
611 st->num_channels_cfg = device_get_child_node_count(dev);
612 if (st->num_channels_cfg > ADS1119_MAX_CHANNELS)
613 return dev_err_probe(dev, -EINVAL,
614 "Too many channels %d, max is %d\n",
615 st->num_channels_cfg,
616 ADS1119_MAX_CHANNELS);
617
618 st->channels_cfg = devm_kcalloc(dev, st->num_channels_cfg,
619 sizeof(*st->channels_cfg), GFP_KERNEL);
620 if (!st->channels_cfg)
621 return -ENOMEM;
622
623 /* Allocate one more iio channel for the timestamp */
624 num_channels = st->num_channels_cfg + 1;
625 iio_channels = devm_kcalloc(dev, num_channels, sizeof(*iio_channels),
626 GFP_KERNEL);
627 if (!iio_channels)
628 return -ENOMEM;
629
630 i = 0;
631
632 device_for_each_child_node_scoped(dev, child) {
633 chan = &iio_channels[i];
634
635 differential = fwnode_property_present(child, "diff-channels");
636 if (differential)
637 ret = fwnode_property_read_u32_array(child,
638 "diff-channels",
639 ain, 2);
640 else
641 ret = fwnode_property_read_u32(child, "single-channel",
642 &ain[0]);
643
644 if (ret)
645 return dev_err_probe(dev, ret,
646 "Failed to get channel property\n");
647
648 ret = ads1119_map_analog_inputs_mux(ain[0], ain[1],
649 differential);
650 if (ret < 0)
651 return dev_err_probe(dev, ret,
652 "Invalid channel value\n");
653
654 st->channels_cfg[i].mux = ret;
655 st->channels_cfg[i].gain = ADS1119_DEFAULT_GAIN;
656 st->channels_cfg[i].datarate = ADS1119_DEFAULT_DATARATE;
657
658 *chan = ads1119_channel;
659 chan->channel = ain[0];
660 chan->address = i;
661 chan->scan_index = i;
662
663 if (differential) {
664 chan->channel2 = ain[1];
665 chan->differential = 1;
666 }
667
668 dev_dbg(dev, "channel: index %d, mux %d\n", i,
669 st->channels_cfg[i].mux);
670
671 i++;
672 }
673
674 iio_channels[i] = ads1119_ts;
675 iio_channels[i].address = i;
676 iio_channels[i].scan_index = i;
677
678 indio_dev->channels = iio_channels;
679 indio_dev->num_channels = num_channels;
680
681 return 0;
682 }
683
ads1119_powerdown(void * data)684 static void ads1119_powerdown(void *data)
685 {
686 struct ads1119_state *st = data;
687
688 i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN);
689 }
690
ads1119_probe(struct i2c_client * client)691 static int ads1119_probe(struct i2c_client *client)
692 {
693 struct iio_dev *indio_dev;
694 struct ads1119_state *st;
695 struct device *dev = &client->dev;
696 bool vref_external = true;
697 int ret;
698
699 indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
700 if (!indio_dev)
701 return -ENOMEM;
702
703 st = iio_priv(indio_dev);
704 st->client = client;
705
706 indio_dev->name = "ads1119";
707 indio_dev->info = &ads1119_info;
708 indio_dev->modes = INDIO_DIRECT_MODE;
709
710 i2c_set_clientdata(client, indio_dev);
711
712 ret = devm_regulator_bulk_get_enable(dev,
713 ARRAY_SIZE(ads1119_power_supplies),
714 ads1119_power_supplies);
715 if (ret)
716 return dev_err_probe(dev, ret,
717 "Failed to get and enable supplies\n");
718
719 st->vref_uV = devm_regulator_get_enable_read_voltage(dev, "vref");
720 if (st->vref_uV == -ENODEV) {
721 vref_external = false;
722 st->vref_uV = ADS1119_VREF_INTERNAL_VAL;
723 } else if (st->vref_uV < 0) {
724 return dev_err_probe(dev, st->vref_uV, "Failed to get vref\n");
725 }
726
727 st->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
728 if (IS_ERR(st->reset_gpio))
729 return dev_err_probe(dev, PTR_ERR(st->reset_gpio),
730 "Failed to get reset gpio\n");
731
732 ret = ads1119_alloc_and_config_channels(indio_dev);
733 if (ret)
734 return ret;
735
736 init_completion(&st->completion);
737
738 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
739 ads1119_trigger_handler,
740 &ads1119_buffer_setup_ops);
741 if (ret)
742 return dev_err_probe(dev, ret, "Failed to setup IIO buffer\n");
743
744 if (client->irq > 0) {
745 ret = devm_request_irq(dev, client->irq, ads1119_irq_handler,
746 IRQF_NO_THREAD, "ads1119", indio_dev);
747 if (ret)
748 return ret;
749
750 st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
751 indio_dev->name,
752 iio_device_id(indio_dev));
753 if (!st->trig)
754 return -ENOMEM;
755
756 st->trig->ops = &ads1119_trigger_ops;
757 iio_trigger_set_drvdata(st->trig, indio_dev);
758
759 ret = devm_iio_trigger_register(dev, st->trig);
760 if (ret)
761 return dev_err_probe(dev, ret,
762 "Failed to register IIO trigger\n");
763 }
764
765 ret = ads1119_init(st, vref_external);
766 if (ret)
767 return dev_err_probe(dev, ret,
768 "Failed to initialize device\n");
769
770 pm_runtime_set_autosuspend_delay(dev, ADS1119_SUSPEND_DELAY);
771 pm_runtime_use_autosuspend(dev);
772 pm_runtime_mark_last_busy(dev);
773 pm_runtime_set_active(dev);
774
775 ret = devm_pm_runtime_enable(dev);
776 if (ret)
777 return dev_err_probe(dev, ret, "Failed to enable pm runtime\n");
778
779 ret = devm_add_action_or_reset(dev, ads1119_powerdown, st);
780 if (ret)
781 return ret;
782
783 return devm_iio_device_register(dev, indio_dev);
784 }
785
ads1119_runtime_suspend(struct device * dev)786 static int ads1119_runtime_suspend(struct device *dev)
787 {
788 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
789 struct ads1119_state *st = iio_priv(indio_dev);
790
791 return i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN);
792 }
793
794 /*
795 * The ADS1119 does not require a resume function because it automatically
796 * powers on after a reset.
797 * After a power down command, the ADS1119 can still communicate but turns off
798 * its analog parts. To resume from power down, the device will power up again
799 * upon receiving a start/sync command.
800 */
801 static DEFINE_RUNTIME_DEV_PM_OPS(ads1119_pm_ops, ads1119_runtime_suspend,
802 NULL, NULL);
803
804 static const struct of_device_id __maybe_unused ads1119_of_match[] = {
805 { .compatible = "ti,ads1119" },
806 { }
807 };
808 MODULE_DEVICE_TABLE(of, ads1119_of_match);
809
810 static const struct i2c_device_id ads1119_id[] = {
811 { .name = "ads1119" },
812 { }
813 };
814 MODULE_DEVICE_TABLE(i2c, ads1119_id);
815
816 static struct i2c_driver ads1119_driver = {
817 .driver = {
818 .name = "ads1119",
819 .of_match_table = ads1119_of_match,
820 .pm = pm_ptr(&ads1119_pm_ops),
821 },
822 .probe = ads1119_probe,
823 .id_table = ads1119_id,
824 };
825 module_i2c_driver(ads1119_driver);
826
827 MODULE_AUTHOR("João Paulo Gonçalves <joao.goncalves@toradex.com>");
828 MODULE_DESCRIPTION("Texas Instruments ADS1119 ADC Driver");
829 MODULE_LICENSE("GPL");
830