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Subject[PATCH] usb: common: usb-conn-gpio: Register charger
Date
Register a power supply charger, whose online state depends on whether
the USB role is set to device or not.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
drivers/usb/common/usb-conn-gpio.c | 45 ++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index ed204cbb63ea..08a411388d3c 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
+#include <linux/power_supply.h>
#include <linux/regulator/consumer.h>
#include <linux/usb/role.h>

@@ -38,6 +39,9 @@ struct usb_conn_info {
struct gpio_desc *vbus_gpiod;
int id_irq;
int vbus_irq;
+
+ struct power_supply_desc desc;
+ struct power_supply *charger;
};

/**
@@ -98,6 +102,8 @@ static void usb_conn_detect_cable(struct work_struct *work)
ret = regulator_enable(info->vbus);
if (ret)
dev_err(info->dev, "enable vbus regulator failed\n");
+ } else {
+ power_supply_changed(info->charger);
}

info->last_role = role;
@@ -121,10 +127,35 @@ static irqreturn_t usb_conn_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static enum power_supply_property usb_charger_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int usb_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct usb_conn_info *info = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = info->last_role == USB_ROLE_DEVICE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int usb_conn_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct power_supply_desc *desc;
struct usb_conn_info *info;
+ struct power_supply_config cfg = {
+ .of_node = dev->of_node,
+ };
int ret = 0;

info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
@@ -203,6 +234,20 @@ static int usb_conn_probe(struct platform_device *pdev)
}
}

+ desc = &info->desc;
+ desc->name = "usb-charger";
+ desc->properties = usb_charger_properties;
+ desc->num_properties = ARRAY_SIZE(usb_charger_properties);
+ desc->get_property = usb_charger_get_property;
+ desc->type = POWER_SUPPLY_TYPE_USB;
+ cfg.drv_data = info;
+
+ info->charger = devm_power_supply_register(dev, desc, &cfg);
+ if (IS_ERR(info->charger)) {
+ dev_err(dev, "Unable to register charger");
+ return PTR_ERR(info->charger);
+ }
+
platform_set_drvdata(pdev, info);

/* Perform initial detection */
--
2.24.1
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