linux-kernel - [PATCH v3 07/10] power: supply: max77693: Set up charge/input current according to cable type

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Message-Id: <20240729-max77693-charger-extcon-v3-7-02315a6869d4@gmail.com>
Date: Mon, 29 Jul 2024 19:47:41 +0200
From: Artur Weber <aweber.kernel@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
 Chanwoo Choi <cw00.choi@...sung.com>
Cc: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>, linux-pm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, Henrik Grimler <henrik@...mler.se>, 
 Wolfgang Wiedmeyer <wolfgit@...dmeyer.de>, 
 Denis 'GNUtoo' Carikli <GNUtoo@...erdimension.org>, 
 Artur Weber <aweber.kernel@...il.com>
Subject: [PATCH v3 07/10] power: supply: max77693: Set up charge/input
 current according to cable type

This behavior was observed on a downstream kernel - for chargers, the
current would be set to a fast charge current value, and it would be
bumped down for all other cable types.

If we leave only the fast charge current value applied, peripheral mode
stops working. If we stick to 500mA, charging becomes too slow. So, set
the charge input current limit accordingly to the cable type.

Signed-off-by: Artur Weber <aweber.kernel@...il.com>
---
Changes in v3:
- Re-introduced this commit from v1. It seems to have been accidentally
  rolled into the previous commit in v2.
---
 drivers/power/supply/max77693_charger.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/max77693_charger.c b/drivers/power/supply/max77693_charger.c
index 4ff402941d72..a3aeaba77309 100644
--- a/drivers/power/supply/max77693_charger.c
+++ b/drivers/power/supply/max77693_charger.c
@@ -716,6 +716,7 @@ static void max77693_charger_extcon_work(struct work_struct *work)
 						  cable.work);
 	struct extcon_dev *edev = chg->cable.edev;
 	bool set_charging, set_otg;
+	unsigned int input_current;
 	int connector, state;
 	int ret;
 
@@ -728,19 +729,28 @@ static void max77693_charger_extcon_work(struct work_struct *work)
 
 	switch (connector) {
 	case EXTCON_CHG_USB_SDP:
-	case EXTCON_CHG_USB_DCP:
 	case EXTCON_CHG_USB_CDP:
+	case EXTCON_CHG_USB_SLOW:
+		input_current = 500000; /* 500 mA */
+		set_charging = true;
+		set_otg = false;
+
+		dev_info(chg->dev, "slow charging. connector type: %d\n",
+			 connector);
+		break;
+	case EXTCON_CHG_USB_DCP:
 	case EXTCON_CHG_USB_ACA:
 	case EXTCON_CHG_USB_FAST:
-	case EXTCON_CHG_USB_SLOW:
 	case EXTCON_CHG_USB_PD:
+		input_current = chg->fast_charge_current;
 		set_charging = true;
 		set_otg = false;
 
-		dev_info(chg->dev, "charging. connector type: %d\n",
+		dev_info(chg->dev, "fast charging. connector type: %d\n",
 			 connector);
 		break;
 	case EXTCON_USB_HOST:
+		input_current = 500000; /* 500 mA */
 		set_charging = false;
 		set_otg = true;
 
@@ -748,6 +758,7 @@ static void max77693_charger_extcon_work(struct work_struct *work)
 			 connector);
 		break;
 	default:
+		input_current = 500000; /* 500 mA */
 		set_charging = false;
 		set_otg = false;
 
@@ -756,6 +767,12 @@ static void max77693_charger_extcon_work(struct work_struct *work)
 		break;
 	}
 
+	ret = max77693_set_input_current_limit(chg, input_current);
+	if (ret) {
+		dev_err(chg->dev, "failed to set input current (%d)\n", ret);
+		goto out;
+	}
+
 	ret = max77693_set_charging(chg, set_charging);
 	if (ret) {
 		dev_err(chg->dev, "failed to set charging (%d)\n", ret);

-- 
2.45.2