[PATCH 1/7] power: supply: axp20x_ac_power: Allow offlining

[PATCH 1/7] power: supply: axp20x_ac_power: Allow offlining

[Samuel Holland]

AXP803/AXP813 have a flag that enables/disables the AC power supply
input. Allow control of this flag via the ONLINE property on those
variants.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_ac_power.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
index 0d34a932b6d5..4410e7b89383 100644
--- a/drivers/power/supply/axp20x_ac_power.c
+++ b/drivers/power/supply/axp20x_ac_power.c
@@ -23,6 +23,8 @@
 #define AXP20X_PWR_STATUS_ACIN_PRESENT	BIT(7)
 #define AXP20X_PWR_STATUS_ACIN_AVAIL	BIT(6)
 
+#define AXP813_ACIN_PATH_SELECT		BIT(7)
+
 #define AXP813_VHOLD_MASK		GENMASK(5, 3)
 #define AXP813_VHOLD_UV_TO_BIT(x)	((((x) / 100000) - 40) << 3)
 #define AXP813_VHOLD_REG_TO_UV(x)	\
@@ -143,6 +145,11 @@ static int axp813_ac_power_set_property(struct power_supply *psy,
 	struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
 
 	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
+					  AXP813_ACIN_PATH_SELECT,
+					  !!val->intval);
+
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		if (val->intval < 4000000 || val->intval > 4700000)
 			return -EINVAL;
@@ -169,7 +176,8 @@ static int axp813_ac_power_set_property(struct power_supply *psy,
 static int axp813_ac_power_prop_writeable(struct power_supply *psy,
 					  enum power_supply_property psp)
 {
-	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
+	return psp == POWER_SUPPLY_PROP_ONLINE ||
+	       psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 	       psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
 }
 
-- 
2.23.0

[PATCH 2/7] power: supply: axp20x_ac_power: Add wakeup control

[Samuel Holland]

The AC power supply input can be used as a wakeup source. Hook up the
ACIN_PLUGIN IRQ to trigger wakeup based on userspace configuration.

To do this, we must remember the list of IRQs for the life of the
device. To know how much space to allocate for the flexible array
member, we switch from using a NULL sentinel to using an array length.

Because we now depend on the specific order of the IRQs (we assume
ACIN_PLUGIN is first and always present), failing to acquire an IRQ
during probe must be a fatal error.

To avoid spuriously waking up the system when the USB power supply is
not configured as a wakeup source, we must explicitly disable all non-
wake IRQs during system suspend. This is because the SoC's NMI input is
shared among all IRQs on the AXP PMIC. Due to the use of regmap-irq, the
individual IRQs within the PMIC are nested threaded interrupts, and are
therefore not automatically disabled during system suspend.

The upshot is that if any other device within the MFD (such as the power
key) is an enabled wakeup source, all enabled IRQs within the PMIC will
cause wakeup. We still need to call enable_irq_wake() when we *do* want
wakeup, in case those other wakeup sources on the PMIC are all disabled.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_ac_power.c | 103 +++++++++++++++++++------
 1 file changed, 80 insertions(+), 23 deletions(-)

diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
index 4410e7b89383..6f172cc62826 100644
--- a/drivers/power/supply/axp20x_ac_power.c
+++ b/drivers/power/supply/axp20x_ac_power.c
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -42,6 +43,8 @@ struct axp20x_ac_power {
 	struct power_supply *supply;
 	struct iio_channel *acin_v;
 	struct iio_channel *acin_i;
+	unsigned int num_irqs;
+	unsigned int irqs[];
 };
 
 static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
@@ -229,34 +232,82 @@ static const struct power_supply_desc axp813_ac_power_desc = {
 	.set_property = axp813_ac_power_set_property,
 };
 
+static const char * const axp20x_irq_names[] = {
+	"ACIN_PLUGIN",
+	"ACIN_REMOVAL",
+};
+
 struct axp_data {
 	const struct power_supply_desc	*power_desc;
+	const char * const		*irq_names;
+	unsigned int			num_irq_names;
 	bool				acin_adc;
 };
 
 static const struct axp_data axp20x_data = {
-	.power_desc = &axp20x_ac_power_desc,
-	.acin_adc = true,
+	.power_desc	= &axp20x_ac_power_desc,
+	.irq_names	= axp20x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp20x_irq_names),
+	.acin_adc	= true,
 };
 
 static const struct axp_data axp22x_data = {
-	.power_desc = &axp22x_ac_power_desc,
-	.acin_adc = false,
+	.power_desc	= &axp22x_ac_power_desc,
+	.irq_names	= axp20x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp20x_irq_names),
+	.acin_adc	= false,
 };
 
 static const struct axp_data axp813_data = {
-	.power_desc = &axp813_ac_power_desc,
-	.acin_adc = false,
+	.power_desc	= &axp813_ac_power_desc,
+	.irq_names	= axp20x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp20x_irq_names),
+	.acin_adc	= false,
 };
 
+#if CONFIG_PM_SLEEP
+static int axp20x_ac_power_suspend(struct device *dev)
+{
+	struct axp20x_ac_power *power = dev_get_drvdata(dev);
+	int i = 0;
+
+	/*
+	 * Allow wake via ACIN_PLUGIN only.
+	 *
+	 * As nested threaded IRQs are not automatically disabled during
+	 * suspend, we must explicitly disable the remainder of the IRQs.
+	 */
+	if (device_may_wakeup(&power->supply->dev))
+		enable_irq_wake(power->irqs[i++]);
+	while (i < power->num_irqs)
+		disable_irq(power->irqs[i++]);
+
+	return 0;
+}
+
+static int axp20x_ac_power_resume(struct device *dev)
+{
+	struct axp20x_ac_power *power = dev_get_drvdata(dev);
+	int i = 0;
+
+	if (device_may_wakeup(&power->supply->dev))
+		disable_irq_wake(power->irqs[i++]);
+	while (i < power->num_irqs)
+		enable_irq(power->irqs[i++]);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(axp20x_ac_power_pm_ops, axp20x_ac_power_suspend,
+						 axp20x_ac_power_resume);
+
 static int axp20x_ac_power_probe(struct platform_device *pdev)
 {
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct power_supply_config psy_cfg = {};
 	struct axp20x_ac_power *power;
 	const struct axp_data *axp_data;
-	static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL",
-		NULL };
 	int i, irq, ret;
 
 	if (!of_device_is_available(pdev->dev.of_node))
@@ -267,12 +318,14 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
+	axp_data = of_device_get_match_data(&pdev->dev);
+
+	power = devm_kzalloc(&pdev->dev,
+			     struct_size(power, irqs, axp_data->num_irq_names),
+			     GFP_KERNEL);
 	if (!power)
 		return -ENOMEM;
 
-	axp_data = of_device_get_match_data(&pdev->dev);
-
 	if (axp_data->acin_adc) {
 		power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
 		if (IS_ERR(power->acin_v)) {
@@ -290,6 +343,7 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
 	}
 
 	power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	power->num_irqs = axp_data->num_irq_names;
 
 	platform_set_drvdata(pdev, power);
 
@@ -303,20 +357,22 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
 		return PTR_ERR(power->supply);
 
 	/* Request irqs after registering, as irqs may trigger immediately */
-	for (i = 0; irq_names[i]; i++) {
-		irq = platform_get_irq_byname(pdev, irq_names[i]);
+	for (i = 0; i < axp_data->num_irq_names; i++) {
+		irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
 		if (irq < 0) {
-			dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
-				 irq_names[i], irq);
-			continue;
+			dev_err(&pdev->dev, "No IRQ for %s: %d\n",
+				axp_data->irq_names[i], irq);
+			return irq;
 		}
-		irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
-		ret = devm_request_any_context_irq(&pdev->dev, irq,
+		power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
+		ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
 						   axp20x_ac_power_irq, 0,
 						   DRVNAME, power);
-		if (ret < 0)
-			dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
-				 irq_names[i], ret);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
+				axp_data->irq_names[i], ret);
+			return ret;
+		}
 	}
 
 	return 0;
@@ -339,8 +395,9 @@ MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
 static struct platform_driver axp20x_ac_power_driver = {
 	.probe = axp20x_ac_power_probe,
 	.driver = {
-		.name = DRVNAME,
-		.of_match_table = axp20x_ac_power_match,
+		.name		= DRVNAME,
+		.of_match_table	= axp20x_ac_power_match,
+		.pm		= &axp20x_ac_power_pm_ops,
 	},
 };
 
-- 
2.23.0

[PATCH 3/7] power: supply: axp20x_usb_power: Remove unused device_node

[Samuel Holland]

This member of struct axp20x_usb_power is not used anywhere.
Remove it.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_usb_power.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index 5f0a5722b19e..dd3f3f12e41d 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -57,7 +57,6 @@
 #define DEBOUNCE_TIME			msecs_to_jiffies(50)
 
 struct axp20x_usb_power {
-	struct device_node *np;
 	struct regmap *regmap;
 	struct power_supply *supply;
 	enum axp20x_variants axp20x_id;
@@ -465,7 +464,6 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 	power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
 								&pdev->dev);
 
-	power->np = pdev->dev.of_node;
 	power->regmap = axp20x->regmap;
 
 	if (power->axp20x_id == AXP202_ID) {
-- 
2.23.0

[PATCH 4/7] power: supply: axp20x_usb_power: Use a match structure

[Samuel Holland]

Instead of ad-hoc variant ID checks throughout the code, let's start
moving the variant-specific details to a match structure. This allows
for future flexibility, and it better matches the other axp20x power
supply drivers.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_usb_power.c | 91 ++++++++++++++++---------
 1 file changed, 60 insertions(+), 31 deletions(-)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index dd3f3f12e41d..2d7272e19a87 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -405,6 +405,50 @@ static const struct power_supply_desc axp22x_usb_power_desc = {
 	.set_property = axp20x_usb_power_set_property,
 };
 
+static const char * const axp20x_irq_names[] = {
+	"VBUS_PLUGIN",
+	"VBUS_REMOVAL",
+	"VBUS_VALID",
+	"VBUS_NOT_VALID",
+	NULL
+};
+
+static const char * const axp22x_irq_names[] = {
+	"VBUS_PLUGIN",
+	"VBUS_REMOVAL",
+	NULL
+};
+
+struct axp_data {
+	const struct power_supply_desc	*power_desc;
+	const char * const		*irq_names;
+	enum axp20x_variants		axp20x_id;
+};
+
+static const struct axp_data axp202_data = {
+	.power_desc	= &axp20x_usb_power_desc,
+	.irq_names	= axp20x_irq_names,
+	.axp20x_id	= AXP202_ID,
+};
+
+static const struct axp_data axp221_data = {
+	.power_desc	= &axp22x_usb_power_desc,
+	.irq_names	= axp22x_irq_names,
+	.axp20x_id	= AXP221_ID,
+};
+
+static const struct axp_data axp223_data = {
+	.power_desc	= &axp22x_usb_power_desc,
+	.irq_names	= axp22x_irq_names,
+	.axp20x_id	= AXP223_ID,
+};
+
+static const struct axp_data axp813_data = {
+	.power_desc	= &axp22x_usb_power_desc,
+	.irq_names	= axp22x_irq_names,
+	.axp20x_id	= AXP813_ID,
+};
+
 static int configure_iio_channels(struct platform_device *pdev,
 				  struct axp20x_usb_power *power)
 {
@@ -440,12 +484,7 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct power_supply_config psy_cfg = {};
 	struct axp20x_usb_power *power;
-	static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
-		"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
-	static const char * const axp22x_irq_names[] = {
-		"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
-	const char * const *irq_names;
-	const struct power_supply_desc *usb_power_desc;
+	const struct axp_data *axp_data;
 	int i, irq, ret;
 
 	if (!of_device_is_available(pdev->dev.of_node))
@@ -456,15 +495,16 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	axp_data = of_device_get_match_data(&pdev->dev);
+
 	power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 	if (!power)
 		return -ENOMEM;
 
-	platform_set_drvdata(pdev, power);
-	power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
-								&pdev->dev);
-
 	power->regmap = axp20x->regmap;
+	power->axp20x_id = axp_data->axp20x_id;
+
+	platform_set_drvdata(pdev, power);
 
 	if (power->axp20x_id == AXP202_ID) {
 		/* Enable vbus valid checking */
@@ -481,18 +521,6 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 
 		if (ret)
 			return ret;
-
-		usb_power_desc = &axp20x_usb_power_desc;
-		irq_names = axp20x_irq_names;
-	} else if (power->axp20x_id == AXP221_ID ||
-		   power->axp20x_id == AXP223_ID ||
-		   power->axp20x_id == AXP813_ID) {
-		usb_power_desc = &axp22x_usb_power_desc;
-		irq_names = axp22x_irq_names;
-	} else {
-		dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
-			axp20x->variant);
-		return -EINVAL;
 	}
 
 	if (power->axp20x_id == AXP813_ID) {
@@ -504,17 +532,18 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 	psy_cfg.of_node = pdev->dev.of_node;
 	psy_cfg.drv_data = power;
 
-	power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
+	power->supply = devm_power_supply_register(&pdev->dev,
+						   axp_data->power_desc,
 						   &psy_cfg);
 	if (IS_ERR(power->supply))
 		return PTR_ERR(power->supply);
 
 	/* Request irqs after registering, as irqs may trigger immediately */
-	for (i = 0; irq_names[i]; i++) {
-		irq = platform_get_irq_byname(pdev, irq_names[i]);
+	for (i = 0; axp_data->irq_names[i]; i++) {
+		irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
 		if (irq < 0) {
 			dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
-				 irq_names[i], irq);
+				 axp_data->irq_names[i], irq);
 			continue;
 		}
 		irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
@@ -522,7 +551,7 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 				axp20x_usb_power_irq, 0, DRVNAME, power);
 		if (ret < 0)
 			dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
-				 irq_names[i], ret);
+				 axp_data->irq_names[i], ret);
 	}
 
 	INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
@@ -544,16 +573,16 @@ static int axp20x_usb_power_remove(struct platform_device *pdev)
 static const struct of_device_id axp20x_usb_power_match[] = {
 	{
 		.compatible = "x-powers,axp202-usb-power-supply",
-		.data = (void *)AXP202_ID,
+		.data = &axp202_data,
 	}, {
 		.compatible = "x-powers,axp221-usb-power-supply",
-		.data = (void *)AXP221_ID,
+		.data = &axp221_data,
 	}, {
 		.compatible = "x-powers,axp223-usb-power-supply",
-		.data = (void *)AXP223_ID,
+		.data = &axp223_data,
 	}, {
 		.compatible = "x-powers,axp813-usb-power-supply",
-		.data = (void *)AXP813_ID,
+		.data = &axp813_data,
 	}, { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
-- 
2.23.0

[PATCH 5/7] power: supply: axp20x_usb_power: Allow offlining

[Samuel Holland]

AXP803/AXP813 have a flag that enables/disables the USB power supply
input. Allow control of this flag via the ONLINE property on those
variants.

It may be necessary to offline the USB power supply input when using
the USB port in OTG mode, or to allow userspace to disable charging.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_usb_power.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index 2d7272e19a87..f49c8ff4a3f0 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -29,6 +29,8 @@
 
 #define AXP20X_USB_STATUS_VBUS_VALID	BIT(2)
 
+#define AXP20X_VBUS_PATH_SELECT		BIT(7)
+
 #define AXP20X_VBUS_VHOLD_uV(b)		(4000000 + (((b) >> 3) & 7) * 100000)
 #define AXP20X_VBUS_VHOLD_MASK		GENMASK(5, 3)
 #define AXP20X_VBUS_VHOLD_OFFSET	3
@@ -344,6 +346,12 @@ static int axp20x_usb_power_set_property(struct power_supply *psy,
 	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 
 	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return regmap_update_bits(power->regmap,
+					  AXP20X_VBUS_IPSOUT_MGMT,
+					  AXP20X_VBUS_PATH_SELECT,
+					  !val->intval);
+
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		return axp20x_usb_power_set_voltage_min(power, val->intval);
 
@@ -363,6 +371,17 @@ static int axp20x_usb_power_set_property(struct power_supply *psy,
 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 					   enum power_supply_property psp)
 {
+	struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
+
+	/*
+	 * Both AXP2xx and AXP8xx have a VBUS path select flag.
+	 * On AXP2xx, setting the flag enables VBUS (ignoring N_VBUSEN).
+	 * On AXP8xx, setting the flag disables VBUS (ignoring N_VBUSEN).
+	 * So we only expose the control on AXP8xx where it is meaningful.
+	 */
+	if (psp == POWER_SUPPLY_PROP_ONLINE)
+		return power->axp20x_id == AXP813_ID;
+
 	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 	       psp == POWER_SUPPLY_PROP_CURRENT_MAX;
 }
-- 
2.23.0

[PATCH 6/7] power: supply: axp20x_usb_power: Add wakeup control

[Samuel Holland]

The USB power supply input can be used as a wakeup source. Hook up the
VBUS_PLUGIN IRQ to trigger wakeup based on userspace configuration.

To do this, we must remember the list of IRQs for the life of the
device. To know how much space to allocate for the flexible array
member, we switch from using a NULL sentinel to using an array length.

Because we now depend on the specific order of the IRQs (we assume
VBUS_PLUGIN is first and always present), failing to acquire an IRQ
during probe must be a fatal error.

To avoid spuriously waking up the system when the USB power supply is
not configured as a wakeup source, we must explicitly disable all non-
wake IRQs during system suspend. This is because the SoC's NMI input is
shared among all IRQs on the AXP PMIC. Due to the use of regmap-irq, the
individual IRQs within the PMIC are nested threaded interrupts, and are
therefore not automatically disabled during system suspend.

The upshot is that if any other device within the MFD (such as the power
key) is an enabled wakeup source, all enabled IRQs within the PMIC will
cause wakeup. We still need to call enable_irq_wake() when we *do* want
wakeup, in case those other wakeup sources on the PMIC are all disabled.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_usb_power.c | 80 ++++++++++++++++++++-----
 1 file changed, 65 insertions(+), 15 deletions(-)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index f49c8ff4a3f0..16062b2c7ea8 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -66,6 +67,8 @@ struct axp20x_usb_power {
 	struct iio_channel *vbus_i;
 	struct delayed_work vbus_detect;
 	unsigned int old_status;
+	unsigned int num_irqs;
+	unsigned int irqs[];
 };
 
 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
@@ -429,45 +432,85 @@ static const char * const axp20x_irq_names[] = {
 	"VBUS_REMOVAL",
 	"VBUS_VALID",
 	"VBUS_NOT_VALID",
-	NULL
 };
 
 static const char * const axp22x_irq_names[] = {
 	"VBUS_PLUGIN",
 	"VBUS_REMOVAL",
-	NULL
 };
 
 struct axp_data {
 	const struct power_supply_desc	*power_desc;
 	const char * const		*irq_names;
+	unsigned int			num_irq_names;
 	enum axp20x_variants		axp20x_id;
 };
 
 static const struct axp_data axp202_data = {
 	.power_desc	= &axp20x_usb_power_desc,
 	.irq_names	= axp20x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp20x_irq_names),
 	.axp20x_id	= AXP202_ID,
 };
 
 static const struct axp_data axp221_data = {
 	.power_desc	= &axp22x_usb_power_desc,
 	.irq_names	= axp22x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp22x_irq_names),
 	.axp20x_id	= AXP221_ID,
 };
 
 static const struct axp_data axp223_data = {
 	.power_desc	= &axp22x_usb_power_desc,
 	.irq_names	= axp22x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp22x_irq_names),
 	.axp20x_id	= AXP223_ID,
 };
 
 static const struct axp_data axp813_data = {
 	.power_desc	= &axp22x_usb_power_desc,
 	.irq_names	= axp22x_irq_names,
+	.num_irq_names	= ARRAY_SIZE(axp22x_irq_names),
 	.axp20x_id	= AXP813_ID,
 };
 
+#if CONFIG_PM_SLEEP
+static int axp20x_usb_power_suspend(struct device *dev)
+{
+	struct axp20x_usb_power *power = dev_get_drvdata(dev);
+	int i = 0;
+
+	/*
+	 * Allow wake via VBUS_PLUGIN only.
+	 *
+	 * As nested threaded IRQs are not automatically disabled during
+	 * suspend, we must explicitly disable the remainder of the IRQs.
+	 */
+	if (device_may_wakeup(&power->supply->dev))
+		enable_irq_wake(power->irqs[i++]);
+	while (i < power->num_irqs)
+		disable_irq(power->irqs[i++]);
+
+	return 0;
+}
+
+static int axp20x_usb_power_resume(struct device *dev)
+{
+	struct axp20x_usb_power *power = dev_get_drvdata(dev);
+	int i = 0;
+
+	if (device_may_wakeup(&power->supply->dev))
+		disable_irq_wake(power->irqs[i++]);
+	while (i < power->num_irqs)
+		enable_irq(power->irqs[i++]);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(axp20x_usb_power_pm_ops, axp20x_usb_power_suspend,
+						  axp20x_usb_power_resume);
+
 static int configure_iio_channels(struct platform_device *pdev,
 				  struct axp20x_usb_power *power)
 {
@@ -516,12 +559,15 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 
 	axp_data = of_device_get_match_data(&pdev->dev);
 
-	power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
+	power = devm_kzalloc(&pdev->dev,
+			     struct_size(power, irqs, axp_data->num_irq_names),
+			     GFP_KERNEL);
 	if (!power)
 		return -ENOMEM;
 
 	power->regmap = axp20x->regmap;
 	power->axp20x_id = axp_data->axp20x_id;
+	power->num_irqs = axp_data->num_irq_names;
 
 	platform_set_drvdata(pdev, power);
 
@@ -558,19 +604,22 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
 		return PTR_ERR(power->supply);
 
 	/* Request irqs after registering, as irqs may trigger immediately */
-	for (i = 0; axp_data->irq_names[i]; i++) {
+	for (i = 0; i < axp_data->num_irq_names; i++) {
 		irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
 		if (irq < 0) {
-			dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
-				 axp_data->irq_names[i], irq);
-			continue;
+			dev_err(&pdev->dev, "No IRQ for %s: %d\n",
+				axp_data->irq_names[i], irq);
+			return irq;
+		}
+		power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
+		ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
+						   axp20x_usb_power_irq, 0,
+						   DRVNAME, power);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
+				axp_data->irq_names[i], ret);
+			return ret;
 		}
-		irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
-		ret = devm_request_any_context_irq(&pdev->dev, irq,
-				axp20x_usb_power_irq, 0, DRVNAME, power);
-		if (ret < 0)
-			dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
-				 axp_data->irq_names[i], ret);
 	}
 
 	INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
@@ -610,8 +659,9 @@ static struct platform_driver axp20x_usb_power_driver = {
 	.probe = axp20x_usb_power_probe,
 	.remove = axp20x_usb_power_remove,
 	.driver = {
-		.name = DRVNAME,
-		.of_match_table = axp20x_usb_power_match,
+		.name		= DRVNAME,
+		.of_match_table	= axp20x_usb_power_match,
+		.pm		= &axp20x_usb_power_pm_ops,
 	},
 };
 
-- 
2.23.0

[PATCH 7/7] power: supply: axp20x_usb_power: Only poll while offline

[Samuel Holland]

Investigation on the AXP803 shows that VBUS_PLUGIN/VBUS_REMOVAL IRQs are
triggered on the rising/falling edge of AXP20X_PWR_STATUS_VBUS_USED. The
reason IRQs do not arrive while N_VBUSEN/DRIVEVBUS is high is because
AXP20X_PWR_STATUS_VBUS_USED also never goes high.

This also means that if VBUS is online, a VBUS_REMOVAL IRQ is received
immediately on setting N_VBUSEN/DRIVEVBUS high (and VBUS_PLUGIN shortly
after it is set back low). This was also verified to be the case when
manually offlining VBUS through AXP20X_VBUS_PATH_SELECT.

Therefore, as long as VBUS is online, a present->absent transition
necessarily implies an online->offline transition. This will cause an
IRQ, and so there is no need to poll.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/power/supply/axp20x_usb_power.c | 35 ++++++++++++++++++-------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index 16062b2c7ea8..0993ea03f303 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -67,16 +67,39 @@ struct axp20x_usb_power {
 	struct iio_channel *vbus_i;
 	struct delayed_work vbus_detect;
 	unsigned int old_status;
+	bool online;
 	unsigned int num_irqs;
 	unsigned int irqs[];
 };
 
+static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
+{
+	/*
+	 * Polling is only necessary while VBUS is offline. While online, a
+	 * present->absent transition implies an online->offline transition
+	 * and will triger the VBUS_REMOVAL IRQ.
+	 */
+	if (power->axp20x_id >= AXP221_ID && !power->online)
+		return true;
+
+	return false;
+}
+
 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
 {
 	struct axp20x_usb_power *power = devid;
 
+	/*
+	 * VBUS_PLUGIN/VBUS_REMOVAL are triggered on transitions of
+	 * AXP20X_PWR_STATUS_VBUS_USED.
+	 */
+	power->online = irq == power->irqs[0];
+
 	power_supply_changed(power->supply);
 
+	if (axp20x_usb_vbus_needs_polling(power))
+		mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
+
 	return IRQ_HANDLED;
 }
 
@@ -96,17 +119,11 @@ static void axp20x_usb_power_poll_vbus(struct work_struct *work)
 		power_supply_changed(power->supply);
 
 	power->old_status = val;
+	power->online = val & AXP20X_PWR_STATUS_VBUS_USED;
 
 out:
-	mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
-}
-
-static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
-{
-	if (power->axp20x_id >= AXP221_ID)
-		return true;
-
-	return false;
+	if (axp20x_usb_vbus_needs_polling(power))
+		mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
 }
 
 static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
-- 
2.23.0

Re: [PATCH 1/7] power: supply: axp20x_ac_power: Allow offlining

[Samuel Holland]

On 1/2/20 12:36 AM, Samuel Holland wrote:
> AXP803/AXP813 have a flag that enables/disables the AC power supply
> input. Allow control of this flag via the ONLINE property on those
> variants.
> 
> Signed-off-by: Samuel Holland <samuel@sholland.org>
> ---
>  drivers/power/supply/axp20x_ac_power.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
> index 0d34a932b6d5..4410e7b89383 100644
> --- a/drivers/power/supply/axp20x_ac_power.c
> +++ b/drivers/power/supply/axp20x_ac_power.c
> @@ -23,6 +23,8 @@
>  #define AXP20X_PWR_STATUS_ACIN_PRESENT	BIT(7)
>  #define AXP20X_PWR_STATUS_ACIN_AVAIL	BIT(6)
>  
> +#define AXP813_ACIN_PATH_SELECT		BIT(7)
> +
>  #define AXP813_VHOLD_MASK		GENMASK(5, 3)
>  #define AXP813_VHOLD_UV_TO_BIT(x)	((((x) / 100000) - 40) << 3)
>  #define AXP813_VHOLD_REG_TO_UV(x)	\
> @@ -143,6 +145,11 @@ static int axp813_ac_power_set_property(struct power_supply *psy,
>  	struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
>  
>  	switch (psp) {
> +	case POWER_SUPPLY_PROP_ONLINE:
> +		return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
> +					  AXP813_ACIN_PATH_SELECT,
> +					  !!val->intval);
> +

Sorry, I failed to use regmap_update_bits properly here and in
patch 5. I'll send a v2 with the value shifted properly.

>  	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
>  		if (val->intval < 4000000 || val->intval > 4700000)
>  			return -EINVAL;
> @@ -169,7 +176,8 @@ static int axp813_ac_power_set_property(struct power_supply *psy,
>  static int axp813_ac_power_prop_writeable(struct power_supply *psy,
>  					  enum power_supply_property psp)
>  {
> -	return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
> +	return psp == POWER_SUPPLY_PROP_ONLINE ||
> +	       psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
>  	       psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
>  }
>  
>