power: qcom-charger: add support for USBIN-USBIN parallel configuration

Add support for USBIN-USBIN configuration based parallel charging. This
involves splitting Input Current Limit(ICL) between the main and the
parallel charger, ICL re-split is done when the settled AICL of the main
charger changes by 300mA.

Change-Id: I5b916f1503a2267ca1e73b24096cb60a304e3c19
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

4 files changed, 37 insertions, 10 deletions

diff --git a/drivers/power/supply/qcom/Makefile b/drivers/power/supply/qcom/Makefile
index 912acb0c788a..a3aff858c190 100644
--- a/drivers/power/supply/qcom/Makefile
+++ b/drivers/power/supply/qcom/Makefile
@@ -2,7 +2,7 @@ obj-$(CONFIG_QPNP_SMBCHARGER)	+= qpnp-smbcharger.o batterydata-lib.o pmic-voter.
 obj-$(CONFIG_QPNP_FG)		+= qpnp-fg.o
 obj-$(CONFIG_QPNP_FG_GEN3)     += qpnp-fg-gen3.o fg-memif.o fg-util.o
 obj-$(CONFIG_SMB135X_CHARGER)   += smb135x-charger.o pmic-voter.o
-obj-$(CONFIG_SMB1351_USB_CHARGER) += smb1351-charger.o pmic-voter.o
+obj-$(CONFIG_SMB1351_USB_CHARGER) += smb1351-charger.o pmic-voter.o battery.o
 obj-$(CONFIG_MSM_BCL_CTL)	+= msm_bcl.o
 obj-$(CONFIG_MSM_BCL_PERIPHERAL_CTL) += bcl_peripheral.o
 obj-$(CONFIG_BATTERY_BCL) += battery_current_limit.o
diff --git a/drivers/power/supply/qcom/battery.c b/drivers/power/supply/qcom/battery.c
index 86e1bc040266..efa88c239379 100644
--- a/drivers/power/supply/qcom/battery.c
+++ b/drivers/power/supply/qcom/battery.c
@@ -34,6 +34,7 @@
 #define PL_TAPER_EARLY_BAD_VOTER	"PL_TAPER_EARLY_BAD_VOTER"
 #define PARALLEL_PSY_VOTER		"PARALLEL_PSY_VOTER"
 #define PL_HW_ABSENT_VOTER		"PL_HW_ABSENT_VOTER"
+#define PL_VOTER			"PL_VOTER"
 
 struct pl_data {
 	int			pl_mode;
@@ -50,8 +51,9 @@ struct pl_data {
 	struct power_supply	*main_psy;
 	struct power_supply	*pl_psy;
 	struct power_supply	*batt_psy;
-	int			settled_ua;
 	int			charge_type;
+	int			main_settled_ua;
+	int			pl_settled_ua;
 	struct class		qcom_batt_class;
 	struct wakeup_source	*pl_ws;
 	struct notifier_block	nb;
@@ -85,7 +87,7 @@ enum {
 static void split_settled(struct pl_data *chip)
 {
 	int slave_icl_pct;
-	int slave_ua = 0;
+	int slave_ua = 0, main_settled_ua = 0;
 	union power_supply_propval pval = {0, };
 	int rc;
 
@@ -108,10 +110,11 @@ static void split_settled(struct pl_data *chip)
 			pr_err("Couldn't get aicl settled value rc=%d\n", rc);
 			return;
 		}
-		chip->settled_ua = pval.intval;
+		main_settled_ua = pval.intval;
 		/* slave gets 10 percent points less for ICL */
 		slave_icl_pct = max(0, chip->slave_pct - 10);
-		slave_ua = (chip->settled_ua * slave_icl_pct) / 100;
+		slave_ua = ((main_settled_ua + chip->pl_settled_ua)
+						* slave_icl_pct) / 100;
 	}
 
 	/* ICL_REDUCTION on main could be 0mA when pl is disabled */
@@ -131,6 +134,11 @@ static void split_settled(struct pl_data *chip)
 		pr_err("Couldn't set parallel icl, rc=%d\n", rc);
 		return;
 	}
+
+	/* main_settled_ua represents the total capability of adapter */
+	if (!chip->main_settled_ua)
+		chip->main_settled_ua = main_settled_ua;
+	chip->pl_settled_ua = slave_ua;
 }
 
 static ssize_t version_show(struct class *c, struct class_attribute *attr,
@@ -379,8 +387,9 @@ static int pl_disable_vote_callback(struct votable *votable,
 	union power_supply_propval pval = {0, };
 	int rc;
 
-	chip->settled_ua = 0;
 	chip->taper_pct = 100;
+	chip->main_settled_ua = 0;
+	chip->pl_settled_ua = 0;
 
 	if (!pl_disable) { /* enable */
 		rc = power_supply_get_property(chip->pl_psy,
@@ -561,6 +570,7 @@ static void handle_main_charge_type(struct pl_data *chip)
 	chip->charge_type = pval.intval;
 }
 
+#define MIN_ICL_CHANGE_DELTA_UA		300000
 static void handle_settled_aicl_split(struct pl_data *chip)
 {
 	union power_supply_propval pval = {0, };
@@ -579,10 +589,11 @@ static void handle_settled_aicl_split(struct pl_data *chip)
 			pr_err("Couldn't get aicl settled value rc=%d\n", rc);
 			return;
 		}
-		if (chip->settled_ua != pval.intval) {
-			chip->settled_ua = pval.intval;
+
+		/* If ICL change is small skip splitting */
+		if (abs((chip->main_settled_ua - chip->pl_settled_ua)
+				- pval.intval) > MIN_ICL_CHANGE_DELTA_UA)
 			split_settled(chip);
-		}
 	}
 }
 
diff --git a/drivers/power/supply/qcom/qpnp-smb2.c b/drivers/power/supply/qcom/qpnp-smb2.c
index 16b7dd8c2ccd..3bfab47dd6c9 100644
--- a/drivers/power/supply/qcom/qpnp-smb2.c
+++ b/drivers/power/supply/qcom/qpnp-smb2.c
@@ -1380,6 +1380,18 @@ static int smb2_init_hw(struct smb2 *chip)
 	vote(chg->hvdcp_enable_votable, MICRO_USB_VOTER,
 			chg->micro_usb_mode, 0);
 
+	/*
+	 * AICL configuration:
+	 * start from min and AICL ADC disable
+	 */
+	rc = smblib_masked_write(chg, USBIN_AICL_OPTIONS_CFG_REG,
+			USBIN_AICL_START_AT_MAX_BIT
+				| USBIN_AICL_ADC_EN_BIT, 0);
+	if (rc < 0) {
+		dev_err(chg->dev, "Couldn't configure AICL rc=%d\n", rc);
+		return rc;
+	}
+
 	/* Configure charge enable for software control; active high */
 	rc = smblib_masked_write(chg, CHGR_CFG2_REG,
 				 CHG_EN_POLARITY_BIT |
diff --git a/drivers/power/supply/qcom/smb-lib.c b/drivers/power/supply/qcom/smb-lib.c
index 6e01ec6174d5..11c82b53a9a1 100644
--- a/drivers/power/supply/qcom/smb-lib.c
+++ b/drivers/power/supply/qcom/smb-lib.c
@@ -774,13 +774,17 @@ static int smblib_usb_icl_vote_callback(struct votable *votable, void *data,
 	if (chg->usb_psy_desc.type != POWER_SUPPLY_TYPE_USB) {
 		if (client) {
 			rc = smblib_set_charge_param(chg, &chg->param.usb_icl,
-					icl_ua);
+					icl_ua - chg->icl_reduction_ua);
 			if (rc < 0) {
 				smblib_err(chg, "Couldn't set HC ICL rc=%d\n",
 					rc);
 				return rc;
 			}
 		}
+
+		smblib_dbg(chg, PR_PARALLEL,
+				"icl_ua=%d icl_reduction=%d\n",
+				icl_ua, chg->icl_reduction_ua);
 		goto out;
 	}