Merge "qcom-charger: fg-util: add float decode function"

Documentation/devicetree/bindings/power/qcom-charger/qpnp-smb2.txt

@@ -21,11 +21,13 @@ Charger specific properties:
   Value type: <string>
   Definition: "qcom,qpnp-smb2".
 
-- qcom,suspend-input
+- qcom,batteryless-platform
   Usage:      optional
   Value type: <empty>
-  Definition: Boolean flag which indicates that the charger should not draw
-	      current from any of its input sources (USB, DC).
+  Definition: Boolean flag which indicates that the platform does not have a
+		battery, and therefore charging should be disabled. In
+		addition battery properties will be faked such that the device
+		assumes normal operation.
 
 - qcom,fcc-max-ua
   Usage:      optional

arch/arm/boot/dts/qcom/msmcobalt-cdp.dtsi

@@ -425,7 +425,7 @@
 };
 
 &pmicobalt_charger {
-	qcom,suspend-input;
+	qcom,batteryless-platform;
 };
 
 &pmicobalt_haptics {

drivers/power/qcom-charger/fg-core.h

@@ -252,4 +252,5 @@ extern int fg_ima_init(struct fg_chip *chip);
 extern int fg_sram_debugfs_create(struct fg_chip *chip);
 extern void fill_string(char *str, size_t str_len, u8 *buf, int buf_len);
 extern int64_t twos_compliment_extend(int64_t val, int s_bit_pos);
+extern s64 fg_float_decode(u16 val);
 #endif

drivers/power/qcom-charger/fg-util.c

@@ -29,6 +29,26 @@ static struct fg_dbgfs dbgfs_data = {
 	},
 };
 
+#define EXPONENT_SHIFT		11
+#define EXPONENT_OFFSET		-9
+#define MANTISSA_SIGN_BIT	10
+#define MICRO_UNIT		1000000
+s64 fg_float_decode(u16 val)
+{
+	s8 exponent;
+	s32 mantissa;
+
+	/* mantissa bits are shifted out during sign extension */
+	exponent = ((s16)val >> EXPONENT_SHIFT) + EXPONENT_OFFSET;
+	/* exponent bits are shifted out during sign extension */
+	mantissa = sign_extend32(val, MANTISSA_SIGN_BIT) * MICRO_UNIT;
+
+	if (exponent < 0)
+		return (s64)mantissa >> -exponent;
+
+	return (s64)mantissa << exponent;
+}
+
 void fill_string(char *str, size_t str_len, u8 *buf, int buf_len)
 {
 	int pos = 0;

drivers/power/qcom-charger/qpnp-smb2.c

@@ -197,7 +197,7 @@ static struct smb_params v1_params = {
 
 #define STEP_CHARGING_MAX_STEPS	5
 struct smb_dt_props {
-	bool	suspend_input;
+	bool	no_battery;
 	int	fcc_ua;
 	int	usb_icl_ua;
 	int	dc_icl_ua;
@@ -256,8 +256,8 @@ static int smb2_parse_dt(struct smb2 *chip)
 	if (rc < 0)
 		chg->step_chg_enabled = false;
 
-	chip->dt.suspend_input = of_property_read_bool(node,
-				"qcom,suspend-input");
+	chip->dt.no_battery = of_property_read_bool(node,
+						"qcom,batteryless-platform");
 
 	rc = of_property_read_u32(node,
 				"qcom,fcc-max-ua", &chip->dt.fcc_ua);
@@ -602,8 +602,9 @@ static int smb2_batt_get_prop(struct power_supply *psy,
 		enum power_supply_property psp,
 		union power_supply_propval *val)
 {
-	int rc;
-	struct smb_charger *chg = power_supply_get_drvdata(psy);
+	struct smb2 *chip = power_supply_get_drvdata(psy);
+	struct smb_charger *chg = &chip->chg;
+	int rc = 0;
 
 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
@@ -929,6 +930,9 @@ static int smb2_init_hw(struct smb2 *chip)
 	struct smb_charger *chg = &chip->chg;
 	int rc;
 
+	if (chip->dt.no_battery)
+		chg->fake_capacity = 50;
+
 	if (chip->dt.fcc_ua < 0)
 		smblib_get_charge_param(chg, &chg->param.fcc, &chip->dt.fcc_ua);
 
@@ -949,9 +953,9 @@ static int smb2_init_hw(struct smb2 *chip)
 	vote(chg->pl_disable_votable,
 		CHG_STATE_VOTER, true, 0);
 	vote(chg->usb_suspend_votable,
-		DEFAULT_VOTER, chip->dt.suspend_input, 0);
+		DEFAULT_VOTER, chip->dt.no_battery, 0);
 	vote(chg->dc_suspend_votable,
-		DEFAULT_VOTER, chip->dt.suspend_input, 0);
+		DEFAULT_VOTER, chip->dt.no_battery, 0);
 	vote(chg->fcc_max_votable,
 		DEFAULT_VOTER, true, chip->dt.fcc_ua);
 	vote(chg->fv_votable,