Re: [PATCH v2 2/2] iio: light: add AS7343 multi-spectral sensor driver

[Joshua Crofts]

Hi Chang,

Please check out Sashiko's review, there are some PM runtime things that
should be resolved + some comments inline.

https://sashiko.dev/#/patchset/20260907210042.32552-1-marcus.yu.56%40gmail.com

Thanks!

Josh

On Mon,  7 Sep 2026 14:00:42 -0700
Chang Yu <marcus.yu.56@xxxxxxxxx> wrote:

...

> +#include <linux/array_size.h>
> +#include <linux/bitfield.h>
> +#include <linux/dev_printk.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/sysfs.h>

+ bits.h, types.h, <asm/byteorder.h> (asm headers go separately, as IIO headers).

> +
> +#include <linux/iio/iio.h>
> +

...

> +struct as7343_data {
> +	struct regmap *regmap;
> +};
> +
> +static int as7343_read_raw(struct iio_dev *indio_dev,
> +			   struct iio_chan_spec const *chan, int *val,
> +			   int *val2, long mask)
> +{
> +	struct as7343_data *data = iio_priv(indio_dev);
> +	int ret;
> +	unsigned int unused;
> +	u16 result;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW: {

The device should resume here, otherwise you'll be reading while suspended.

> +		/*
> +		 * Reading ASTATUS latches all data registers to this read.
> +		 * We don't care about the returned saturation/gain status for
> +		 * now.
> +		 */

Sashiko points out that a mutex here would come in handy. If you're going to add
a mutex, use the guard(mutex) macro for automatic unlocking on scope exit.

> +		ret = regmap_read(data->regmap, AS7343_ASTATUS, &unused);
> +		if (ret)
> +			return ret;
> +
> +		ret = regmap_bulk_read(data->regmap, chan->address, &result, 2);
> +		if (ret)
> +			return ret;
> +
> +		*val = le16_to_cpu(result);
> +		return IIO_VAL_INT;
> +	}
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const char *as7343_channel_label(struct iio_chan_spec const *chan)
> +{
> +	switch (chan->channel) {
> +	case AS7343_CHAN_IDX_FZ:
> +		return "FZ";
> +	case AS7343_CHAN_IDX_FY:
> +		return "FY";
> +	case AS7343_CHAN_IDX_FXL:
> +		return "FXL";
> +	case AS7343_CHAN_IDX_NIR:
> +		return "NIR";
> +	case AS7343_CHAN_IDX_F2:
> +		return "F2";
> +	case AS7343_CHAN_IDX_F3:
> +		return "F3";
> +	case AS7343_CHAN_IDX_F4:
> +		return "F4";
> +	case AS7343_CHAN_IDX_F6:
> +		return "F6";
> +	case AS7343_CHAN_IDX_F1:
> +		return "F1";
> +	case AS7343_CHAN_IDX_F7:
> +		return "F7";
> +	case AS7343_CHAN_IDX_F8:
> +		return "F8";
> +	case AS7343_CHAN_IDX_F5:
> +		return "F5";
> +	default:
> +		return NULL;
> +	}
> +}
> +
> +static int as7343_read_label(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan, char *label)
> +{
> +	const char *name;
> +
> +	name = as7343_channel_label(chan);
> +	if (!name)
> +		return -EINVAL;

A blank line here would be better.

> +	return sysfs_emit(label, "%s\n", name);
> +}
> +
> +static const struct iio_info as7343_info = {
> +	.read_raw = as7343_read_raw,
> +	.read_label = as7343_read_label,
> +};
> +
> +static const struct regmap_config as7343_regmap_config = {
> +	.name = "as7343",
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = AS7343_MAX,
> +	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
> +	.val_format_endian = REGMAP_ENDIAN_LITTLE,
> +	.cache_type = REGCACHE_NONE,
> +};
> +
> +static int as7343_setup_device(struct device *dev, struct as7343_data *data)
> +{
> +	unsigned int val;
> +	u16 step;

__le16 instead of u16.

> +	int ret;
> +
> +	/* Power on */
> +	ret = regmap_set_bits(data->regmap, AS7343_ENABLE, AS7343_ENABLE_PON);
> +	if (ret)
> +		return ret;
> +
> +	/* Need to set REG_BANK to 1 before we can access ID */
> +	ret = regmap_set_bits(data->regmap, AS7343_CFG0, AS7343_CFG0_REG_BANK);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_read(data->regmap, AS7343_ID, &val);

You should check the value of ret as well in case of a regmap failure.

-- 
Kind regards,
Joshua Crofts