linux-kernel - [PATCH 02/10] power: supply: axp20x_usb_power: set min voltage and max current from sysfs

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Date:   Fri, 25 Nov 2016 10:09:13 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     sre@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        wens@...e.org, linux@...linux.org.uk,
        maxime.ripard@...e-electrons.com, lee.jones@...aro.org
Cc:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        thomas.petazzoni@...e-electrons.com
Subject: [PATCH 02/10] power: supply: axp20x_usb_power: set min voltage and max current from sysfs

AXP20X and AXP22X PMICs allow setting the min voltage and max current of
VBUS power supply. This adds entries in sysfs to allow to do so.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---
 drivers/power/supply/axp20x_usb_power.c | 72 +++++++++++++++++++++++++++++++++
 include/linux/mfd/axp20x.h              |  3 ++
 2 files changed, 75 insertions(+)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index b19754e..638cb52 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -155,6 +155,74 @@ static int axp20x_usb_power_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static int axp20x_usb_power_set_property(struct power_supply *psy,
+					 enum power_supply_property psp,
+					 const union power_supply_propval *val)
+{
+	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
+	int ret, val1;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+		switch (val->intval) {
+		case 4000000:
+		case 4100000:
+		case 4200000:
+		case 4300000:
+		case 4400000:
+		case 4500000:
+		case 4600000:
+		case 4700000:
+			val1 = (val->intval - 4000000) / 100000;
+			ret = regmap_update_bits(power->regmap,
+						 AXP20X_VBUS_IPSOUT_MGMT,
+						 AXP20X_VBUS_VHOLD_MASK,
+						 val1 << 3);
+			if (ret)
+				return ret;
+
+			return 0;
+		default:
+			return -EINVAL;
+		}
+
+		return 0;
+
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		switch (val->intval) {
+		case 100000:
+			if (power->axp20x_id == AXP221_ID)
+				return -EINVAL;
+		case 500000:
+		case 900000:
+			val1 = (900000 - val->intval) / 400000;
+			ret = regmap_update_bits(power->regmap,
+						 AXP20X_VBUS_IPSOUT_MGMT,
+						 AXP20X_VBUS_CLIMIT_MASK, val1);
+			if (ret)
+				return ret;
+
+			return 0;
+		default:
+			return -EINVAL;
+		}
+
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
+					   enum power_supply_property psp)
+{
+	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
+	       psp == POWER_SUPPLY_PROP_CURRENT_MAX;
+}
+
 static enum power_supply_property axp20x_usb_power_properties[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_PRESENT,
@@ -178,7 +246,9 @@ static const struct power_supply_desc axp20x_usb_power_desc = {
 	.type = POWER_SUPPLY_TYPE_USB,
 	.properties = axp20x_usb_power_properties,
 	.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
+	.property_is_writeable = axp20x_usb_power_prop_writeable,
 	.get_property = axp20x_usb_power_get_property,
+	.set_property = axp20x_usb_power_set_property,
 };
 
 static const struct power_supply_desc axp22x_usb_power_desc = {
@@ -186,7 +256,9 @@ static const struct power_supply_desc axp22x_usb_power_desc = {
 	.type = POWER_SUPPLY_TYPE_USB,
 	.properties = axp22x_usb_power_properties,
 	.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
+	.property_is_writeable = axp20x_usb_power_prop_writeable,
 	.get_property = axp20x_usb_power_get_property,
+	.set_property = axp20x_usb_power_set_property,
 };
 
 static const struct of_device_id axp20x_usb_power_match[] = {
diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index fec597f..8883595 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -56,6 +56,9 @@ enum {
 #define AXP20X_LDO24_V_OUT		0x28
 #define AXP20X_LDO3_V_OUT		0x29
 #define AXP20X_VBUS_IPSOUT_MGMT		0x30
+
+#define AXP20X_VBUS_VHOLD_MASK		GENMASK(5, 3)
+
 #define AXP20X_V_OFF			0x31
 #define AXP20X_OFF_CTRL			0x32
 #define AXP20X_CHRG_CTRL1		0x33
-- 
2.9.3