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iio: adc: hx711: introduce hx711_chip_info structure

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Add a per-variant static configuration structure and populate the IIO
device fields from it at probe time.

This is a preparatory change for adding support for more HX711-compatible
hardware variants without duplicating the probe-time setup.

No functional change for existing HX711 users.

Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Piyush Patle 2026-06-04 00:18:54 +05:30 committed by Jonathan Cameron
parent 15842186c3
commit e301c363db
1 changed files with 36 additions and 5 deletions
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41
drivers/iio/adc/hx711.c
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@ -4,6 +4,8 @@
*
* Copyright (c) 2016 Andreas Klinger <ak@it-klinger.de>
*/
#include <linux/array_size.h>
#include <linux/dev_printk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -74,6 +76,20 @@ static int hx711_get_scale_to_gain(const int *gain_scale, int scale)
return -EINVAL;
}
/**
* struct hx711_chip_info - per-variant static configuration
* @name: IIO device name
* @channels: channel specification array
* @num_channels: number of entries in @channels
* @iio_info: IIO info ops for this variant
*/
struct hx711_chip_info {
const char *name;
const struct iio_chan_spec *channels __counted_by_ptr(num_channels);
unsigned int num_channels;
const struct iio_info *iio_info;
};
struct hx711_data {
struct device *dev;
struct gpio_desc *gpiod_pd_sck;
@ -81,6 +97,7 @@ struct hx711_data {
int gain_set; /* gain set on device */
int gain_chan_a; /* gain for channel A */
int gain_scale[HX711_GAIN_MAX];
const struct hx711_chip_info *chip_info;
struct mutex lock;
/*
* triggered buffer
@ -456,8 +473,16 @@ static const struct iio_chan_spec hx711_chan_spec[] = {
IIO_CHAN_SOFT_TIMESTAMP(2),
};
static const struct hx711_chip_info hx711_chip = {
.name = "hx711",
.channels = hx711_chan_spec,
.iio_info = &hx711_iio_info,
.num_channels = ARRAY_SIZE(hx711_chan_spec),
};
static int hx711_probe(struct platform_device *pdev)
{
const struct hx711_chip_info *chip_info;
struct device *dev = &pdev->dev;
struct hx711_data *hx711_data;
struct iio_dev *indio_dev;
@ -473,6 +498,12 @@ static int hx711_probe(struct platform_device *pdev)
mutex_init(&hx711_data->lock);
chip_info = device_get_match_data(dev);
if (!chip_info)
return dev_err_probe(dev, -ENODEV, "missing driver data\n");
hx711_data->chip_info = chip_info;
/*
* PD_SCK stands for power down and serial clock input of HX711
* in the driver it is an output
@ -534,11 +565,11 @@ static int hx711_probe(struct platform_device *pdev)
hx711_data->data_ready_delay_ns =
1000000000 / hx711_data->clock_frequency;
indio_dev->name = "hx711";
indio_dev->info = &hx711_iio_info;
indio_dev->name = chip_info->name;
indio_dev->info = chip_info->iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = hx711_chan_spec;
indio_dev->num_channels = ARRAY_SIZE(hx711_chan_spec);
indio_dev->channels = chip_info->channels;
indio_dev->num_channels = chip_info->num_channels;
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
iio_pollfunc_store_time,
@ -555,7 +586,7 @@ static int hx711_probe(struct platform_device *pdev)
}
static const struct of_device_id of_hx711_match[] = {
{ .compatible = "avia,hx711", },
{ .compatible = "avia,hx711", .data = &hx711_chip },
{ }
};