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Commit 654b1238 authored by Nicholas Troast's avatar Nicholas Troast
Browse files

qpnp-smb2: support batteryless platforms 



Currently a device without a battery will shutdown soon after boot since
the SOC will be 0. Add a DT property called "qcom,batteryless-platform"
which indicates that the device does not have a battery. If this
property is set then charging will be disabled, and all of the necessary
battery parameters will be faked to ensure normal operation.

Change-Id: I6943b7f5565ad95eddb9e3d30de5efbc47106e3d
Signed-off-by: default avatarNicholas Troast <ntroast@codeaurora.org>
parent 4b91c1a0

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

+5 −3
Original line number Diff line number Diff line
@@ -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

+1 −1
Original line number Diff line number Diff line
@@ -418,7 +418,7 @@ 
};



&pmicobalt_charger {

	qcom,suspend-input;

	qcom,batteryless-platform;

};



&pmicobalt_haptics {

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

+11 −7
Original line number Diff line number Diff line
@@ -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,