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power: supply: bd71828: sysfs for auto input current limitation

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Add the possibility to disable the auto adjustment for input current
limitation via sysfs because it gives strange results under certain
circumstances e.g. when powering the device with solar panels
resulting in no input power usage at all.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://patch.msgid.link/20260504164017.467679-1-andreas@kemnade.info
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Andreas Kemnade 2026-05-04 18:40:17 +02:00 committed by Sebastian Reichel
parent a9e36028b6
commit e92786dd86
2 changed files with 80 additions and 1 deletions
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12
Documentation/ABI/testing/sysfs-class-power-bd71828 Normal file
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@ -0,0 +1,12 @@
What: /sys/class/power_supply/bd71828_ac/auto_dcin_limit
Description:
Enable/Disable automatic management of input current limit
(ILIM_DCIN_EN bit).
Possible values are:
============ ===========================================
1 automatic adjustment of input current limit
0 no adjustment of input current limit. This
helps for more unusual power sources like
solar modules.

69
drivers/power/supply/bd71828-power.c
View File

@ -12,6 +12,7 @@
#include <linux/property.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
/* common defines */
#define BD7182x_MASK_VBAT_U 0x1f
@ -25,6 +26,7 @@
#define BD71815_MASK_CONF_XSTB BIT(1)
#define BD7182x_MASK_BAT_STAT 0x3f
#define BD7182x_MASK_ILIM 0x3f
#define BD71828_MASK_ILIM_DCIN_EN BIT(6)
#define BD7182x_MASK_DCIN_STAT 0x07
#define BD7182x_MASK_WDT_AUTO 0x40
@ -1099,10 +1101,75 @@ static int bd7182x_get_rsens(struct bd71828_power *pwr)
return 0;
}
static ssize_t auto_dcin_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bd71828_power *pwr = dev_get_drvdata(dev->parent);
int ret;
unsigned int v;
ret = regmap_read(pwr->regmap, pwr->regs->dcin_set, &v);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", !!(v & BD71828_MASK_ILIM_DCIN_EN));
}
static ssize_t auto_dcin_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bd71828_power *pwr = dev_get_drvdata(dev->parent);
int ret;
bool v;
ret = kstrtobool(buf, &v);
if (ret < 0)
return ret;
ret = regmap_update_bits(pwr->regmap, BD71828_REG_DCIN_SET,
BD71828_MASK_ILIM_DCIN_EN,
v ? BD71828_MASK_ILIM_DCIN_EN : 0);
if (ret < 0)
return ret;
return len;
}
static DEVICE_ATTR_RW(auto_dcin_limit);
static struct attribute *bd71828_ac_sysfs_attrs[] = {
&dev_attr_auto_dcin_limit.attr,
NULL,
};
static bool bd71828_ac_sysfs_group_visible(struct kobject *kobj)
{
struct device *dev = kobj_to_dev(kobj);
struct bd71828_power *pwr = dev_get_drvdata(dev->parent);
return !!pwr->regs->dcin_set;
}
DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(bd71828_ac_sysfs);
static const struct attribute_group bd71828_ac_sysfs_group = {
.attrs = bd71828_ac_sysfs_attrs,
.is_visible = SYSFS_GROUP_VISIBLE(bd71828_ac_sysfs)
};
static const struct attribute_group *bd71828_ac_sysfs_groups[] = {
&bd71828_ac_sysfs_group,
NULL
};
static int bd71828_power_probe(struct platform_device *pdev)
{
struct bd71828_power *pwr;
struct power_supply_config ac_cfg = {};
struct power_supply_config ac_cfg = {
.attr_grp = bd71828_ac_sysfs_groups,
};
struct power_supply_config bat_cfg = {};
int ret;