Re: [PATCH 3/3] drivers: iio: chemical: Add support for Sensirion SCD4x CO2 sensor

From: kernel test robot
Date: Tue Aug 31 2021 - 19:37:46 EST

Hi Roan,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linux/master linus/master v5.14]
[cannot apply to iio/togreg next-20210831]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Roan-van-Dijk/iio-chemical-Add-support-for-Sensirion-SCD4x-CO2-sensor/20210831-202025
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: hexagon-randconfig-r036-20210901 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4b1fde8a2b681dad2ce0c082a5d6422caa06b0bc)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/605896bbee687d465d4ae58d910878e9b85f0035
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Roan-van-Dijk/iio-chemical-Add-support-for-Sensirion-SCD4x-CO2-sensor/20210831-202025
git checkout 605896bbee687d465d4ae58d910878e9b85f0035
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/iio/chemical/scd4x.c:503:20: warning: no previous prototype for function 'scd4x_suspend' [-Wmissing-prototypes]
int __maybe_unused scd4x_suspend(struct device *dev)
^
drivers/iio/chemical/scd4x.c:503:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __maybe_unused scd4x_suspend(struct device *dev)
^
static
>> drivers/iio/chemical/scd4x.c:517:20: warning: no previous prototype for function 'scd4x_resume' [-Wmissing-prototypes]
int __maybe_unused scd4x_resume(struct device *dev)
^
drivers/iio/chemical/scd4x.c:517:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __maybe_unused scd4x_resume(struct device *dev)
^
static
>> drivers/iio/chemical/scd4x.c:613:5: warning: no previous prototype for function 'scd4x_probe' [-Wmissing-prototypes]
int scd4x_probe(struct i2c_client *client, const struct i2c_device_id *id)
^
drivers/iio/chemical/scd4x.c:613:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int scd4x_probe(struct i2c_client *client, const struct i2c_device_id *id)
^
static
3 warnings generated.


vim +/scd4x_suspend +503 drivers/iio/chemical/scd4x.c

502
> 503 int __maybe_unused scd4x_suspend(struct device *dev)
504 {
505 struct iio_dev *indio_dev = dev_get_drvdata(dev);
506 struct scd4x_state *state = iio_priv(indio_dev);
507 int ret;
508
509 ret = scd4x_send_command(state, CMD_STOP_MEAS);
510 if (ret)
511 return ret;
512
513 return regulator_disable(state->vdd);
514 }
515 EXPORT_SYMBOL(scd4x_suspend);
516
> 517 int __maybe_unused scd4x_resume(struct device *dev)
518 {
519 struct iio_dev *indio_dev = dev_get_drvdata(dev);
520 struct scd4x_state *state = iio_priv(indio_dev);
521 int ret;
522
523 ret = regulator_enable(state->vdd);
524 if (ret)
525 return ret;
526
527 return scd4x_send_command(state, CMD_START_MEAS);
528 }
529 EXPORT_SYMBOL(scd4x_resume);
530
531 static void scd4x_stop_meas(void *data)
532 {
533 struct scd4x_state *state = data;
534
535 scd4x_send_command(state, CMD_STOP_MEAS);
536 }
537
538 static void scd4x_disable_regulator(void *data)
539 {
540 struct scd4x_state *state = data;
541
542 regulator_disable(state->vdd);
543 }
544
545 static irqreturn_t scd4x_trigger_handler(int irq, void *p)
546 {
547 struct iio_poll_func *pf = p;
548 struct iio_dev *indio_dev = pf->indio_dev;
549 struct scd4x_state *state = iio_priv(indio_dev);
550 struct {
551 int data[3];
552 int64_t ts __aligned(8);
553 } scan;
554 int ret;
555
556 mutex_lock(&state->lock);
557 ret = scd4x_read_poll(state);
558 memset(&scan, 0, sizeof(scan));
559 memcpy(scan.data, state->meas, sizeof(state->meas));
560 mutex_unlock(&state->lock);
561 if (ret)
562 goto out;
563
564 iio_push_to_buffers_with_timestamp(indio_dev, &scan, iio_get_time_ns(indio_dev));
565 out:
566 iio_trigger_notify_done(indio_dev->trig);
567 return IRQ_HANDLED;
568 }
569
570 static int scd4x_set_trigger_state(struct iio_trigger *trig, bool state)
571 {
572 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
573 struct scd4x_state *st = iio_priv(indio_dev);
574
575 if (state)
576 enable_irq(st->irq);
577 else
578 disable_irq(st->irq);
579
580 return 0;
581 }
582
583 static const struct iio_trigger_ops scd4x_trigger_ops = {
584 .set_trigger_state = scd4x_set_trigger_state,
585 .validate_device = iio_trigger_validate_own_device,
586 };
587
588 static int scd4x_setup_trigger(struct iio_dev *indio_dev)
589 {
590 struct device *dev = indio_dev->dev.parent;
591 struct iio_trigger *trig;
592 int ret;
593
594 trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,
595 iio_device_id(indio_dev));
596 if (!trig) {
597 dev_err(dev, "failed to allocate trigger\n");
598 return -ENOMEM;
599 }
600
601 trig->ops = &scd4x_trigger_ops;
602 iio_trigger_set_drvdata(trig, indio_dev);
603
604 ret = devm_iio_trigger_register(dev, trig);
605 if (ret)
606 return ret;
607
608 indio_dev->trig = iio_trigger_get(trig);
609
610 return ret;
611 }
612
> 613 int scd4x_probe(struct i2c_client *client, const struct i2c_device_id *id)
614 {
615 static const unsigned long scd4x_scan_masks[] = { 0x07, 0x00 };
616 struct device *dev = &client->dev;
617 struct iio_dev *indio_dev;
618 struct scd4x_state *state;
619 int ret;
620
621 indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
622 if (!indio_dev)
623 return -ENOMEM;
624
625 state = iio_priv(indio_dev);
626 mutex_init(&state->lock);
627 state->dev = dev;
628 crc8_populate_msb(scd4x_crc8_table, SCD4X_CRC8_POLYNOMIAL);
629
630 indio_dev->info = &scd4x_info;
631 indio_dev->name = client->name;
632 indio_dev->channels = scd4x_channels;
633 indio_dev->num_channels = ARRAY_SIZE(scd4x_channels);
634 indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;
635 indio_dev->available_scan_masks = scd4x_scan_masks;
636
637 state->vdd = devm_regulator_get(dev, "vdd");
638 if (IS_ERR(state->vdd))
639 return dev_err_probe(dev, PTR_ERR(state->vdd), "failed to get regulator\n");
640
641 ret = regulator_enable(state->vdd);
642 if (ret)
643 return ret;
644
645 ret = devm_add_action_or_reset(dev, scd4x_disable_regulator, state);
646 if (ret)
647 return ret;
648
649 ret = scd4x_send_command(state, CMD_STOP_MEAS);
650 if (ret) {
651 dev_err(dev, "failed to stop measurement: %d\n", ret);
652 return ret;
653 }
654
655 /* execution time */
656 msleep_interruptible(500);
657
658 if (state->irq > 0) {
659 ret = scd4x_setup_trigger(indio_dev);
660 if (ret) {
661 dev_err(dev, "failed to setup trigger: %d\n", ret);
662 return ret;
663 }
664 }
665
666 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, scd4x_trigger_handler, NULL);
667 if (ret)
668 return ret;
669
670 ret = devm_iio_device_register(dev, indio_dev);
671 if (ret) {
672 dev_err(dev, "failed to register iio device\n");
673 return ret;
674 }
675
676 ret = scd4x_send_command(state, CMD_START_MEAS);
677 if (ret) {
678 dev_err(dev, "failed to start measurement: %d\n", ret);
679 return ret;
680 }
681
682 ret = devm_add_action_or_reset(dev, scd4x_stop_meas, state);
683 if (ret)
684 return ret;
685
686 return 0;
687 }
688 EXPORT_SYMBOL(scd4x_probe);
689

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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