--- src-b10b3/drivers/power/supply/Kconfig	2026-09-21 19:09:00.000000000 +0600
+++ src-b10b4/drivers/power/supply/Kconfig	2026-10-04 18:42:45.872000000 +0600
@@ -768,6 +768,15 @@
 	  To compile this driver as module, choose M here: the
 	  module will be called pm8916_lbc.
 
+config CHARGER_PM8916_LBC_B10B4_DEBUG
+	bool "Aurora B10B-4 TEST-ONLY charger actuator debugfs hook"
+	depends on CHARGER_PM8916_LBC && DEBUG_FS
+	default n
+	help
+	  TEST-ONLY (Aurora B10B-4, RAM images only). Adds the write-only debugfs file
+	  pm8916_lbc/b10b4 accepting exactly "susp 0|1" (USB_SUSP bit0), "vdd <0..8>"
+	  (VDD_MAX) and "ibat <0..4>" (IBAT_MAX). Never enable in a production image.
+
 config CHARGER_BQ2415X
 	tristate "TI BQ2415x battery charger driver"
 	depends on I2C
--- src-b10b3/drivers/power/supply/pm8916_lbc.c	2026-10-03 21:11:03.584000000 +0600
+++ src-b10b4/drivers/power/supply/pm8916_lbc.c	2026-10-04 18:17:19.300000000 +0600
@@ -20,6 +20,11 @@
 #include <linux/of.h>
 #include <linux/seq_file.h>
 #include <linux/workqueue.h>
+#ifdef CONFIG_CHARGER_PM8916_LBC_B10B4_DEBUG
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#endif
 
 /* Two bytes: type + subtype */
 #define PM8916_PERPH_TYPE 0x04
@@ -544,6 +549,78 @@
 }
 DEFINE_SHOW_ATTRIBUTE(lbc_state);
 
+#ifdef CONFIG_CHARGER_PM8916_LBC_B10B4_DEBUG
+/*
+ * Aurora B10B-4 TEST-ONLY actuator hook (Kconfig CHARGER_PM8916_LBC_B10B4_DEBUG, default n, RAM test images only).
+ * Write-only debugfs file pm8916_lbc/b10b4, exactly one of:
+ *   "susp 0|1"   USB_SUSP (USB block + 0x47) bit0 only, masked update
+ *   "vdd <code>" VDD_MAX (CHGR block + 0x40), code 0x00..0x08 (4.000..4.200 V)
+ *   "ibat <code>" IBAT_MAX (CHGR block + 0x44), code 0x00..0x04 (90..450 mA)
+ * Anything else (unknown command, extra/missing argument, out-of-range value) -> -EINVAL without any write.
+ * Taken under supv_lock (the supervisor/charger lock); old/new/readback logged with dev_warn. Supervisor logic unchanged.
+ */
+#define PM8916_LBC_USB_SUSP 0x47
+#define PM8916_LBC_USB_SUSP_BIT BIT(0)
+
+static ssize_t lbc_b10b4_write(struct file *file, const char __user *ubuf, size_t len, loff_t *ppos)
+{
+	struct pm8916_lbc_charger *chg = file->private_data;
+	char buf[32], *p, *cmd, *arg;
+	unsigned int val, addr, mask, old, rb;
+	int ret;
+
+	if (len == 0 || len >= sizeof(buf))
+		return -EINVAL;
+	if (copy_from_user(buf, ubuf, len))
+		return -EFAULT;
+	buf[len] = 0;
+	p = strim(buf);
+	cmd = strsep(&p, " ");
+	arg = strsep(&p, " ");
+	if (!cmd || !arg || p || kstrtouint(arg, 0, &val))
+		return -EINVAL;
+
+	if (!strcmp(cmd, "susp") && val <= 1) {
+		addr = chg->reg[LBC_USB] + PM8916_LBC_USB_SUSP;
+		mask = PM8916_LBC_USB_SUSP_BIT;
+	} else if (!strcmp(cmd, "vdd") && val <= 0x08) {
+		addr = chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_MAX;
+		mask = 0xff;
+	} else if (!strcmp(cmd, "ibat") && val <= 0x04) {
+		addr = chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_MAX;
+		mask = 0xff;
+	} else {
+		return -EINVAL;
+	}
+
+	mutex_lock(&chg->supv_lock);
+	ret = regmap_read(chg->regmap, addr, &old);
+	if (!ret) {
+		if (mask == 0xff)
+			ret = regmap_write(chg->regmap, addr, val);
+		else
+			ret = regmap_update_bits(chg->regmap, addr, mask, val ? mask : 0);
+	}
+	if (!ret)
+		ret = regmap_read(chg->regmap, addr, &rb);
+	mutex_unlock(&chg->supv_lock);
+
+	if (ret) {
+		dev_warn(chg->dev, "B10B-4 TEST hook: %s %u at 0x%04x failed: %d\n", cmd, val, addr, ret);
+		return ret;
+	}
+	dev_warn(chg->dev, "B10B-4 TEST hook: %s %u -> reg 0x%04x old 0x%02x readback 0x%02x\n", cmd, val, addr, old, rb);
+	return len;
+}
+
+static const struct file_operations lbc_b10b4_fops = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.write = lbc_b10b4_write,
+	.llseek = noop_llseek,
+};
+#endif
+
 static void lbc_debugfs_remove(void *data)
 {
 	debugfs_remove_recursive(data);
@@ -771,6 +848,10 @@
 
 	chg->debugfs = debugfs_create_dir("pm8916_lbc", NULL);
 	debugfs_create_file("state", 0444, chg->debugfs, chg, &lbc_state_fops);
+#ifdef CONFIG_CHARGER_PM8916_LBC_B10B4_DEBUG
+	debugfs_create_file("b10b4", 0200, chg->debugfs, chg, &lbc_b10b4_fops);
+	dev_warn(dev, "B10B-4 TEST-ONLY actuator hook enabled (debugfs pm8916_lbc/b10b4) - never in production\n");
+#endif
 	ret = devm_add_action_or_reset(dev, lbc_debugfs_remove, chg->debugfs);
 	if (ret)
 		return ret;