power: supply: qcom_smbx: allow disabling charging

Hook up USBIN_CMD_IL so that writing "0" to the status register will
disable charging, this is useful to let users limit charging
automatically.

Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20260315-smb2-cherry-pick-v1-1-b2710e470490@ixit.cz
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: kcxt

drivers/power/supply/qcom_smbx.c

@@ -134,6 +134,9 @@
 #define OCP_CHARGER_BIT					BIT(1)
 #define SDP_CHARGER_BIT					BIT(0)
 
+#define USBIN_CMD_IL					0x340
+#define USBIN_SUSPEND_BIT				BIT(0)
+
 #define TYPE_C_STATUS_1					0x30B
 #define UFP_TYPEC_MASK					GENMASK(7, 5)
 #define UFP_TYPEC_RDSTD_BIT				BIT(7)
@@ -693,6 +696,9 @@ static int smb_set_property(struct power_supply *psy,
 	struct smb_chip *chip = power_supply_get_drvdata(psy);
 
 	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		return regmap_update_bits(chip->regmap, chip->base + USBIN_CMD_IL,
+					  USBIN_SUSPEND_BIT, !val->intval);
 	case POWER_SUPPLY_PROP_CURRENT_MAX:
 		return smb_set_current_limit(chip, val->intval);
 	default:
@@ -705,6 +711,7 @@ static int smb_property_is_writable(struct power_supply *psy,
 				     enum power_supply_property psp)
 {
 	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
 	case POWER_SUPPLY_PROP_CURRENT_MAX:
 		return 1;
 	default: