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Date: Sun, 3 Nov 2019 23:08:01 +0100
From: Paul Cercueil <paul@...pouillou.net>
To: Sebastian Reichel <sre@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, od@...c.me,
Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/2] power/supply: Add generic USB charger driver
This simple charger driver uses the USB PHY framework to detect the
presence of a charger.
Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
drivers/power/supply/Kconfig | 7 ++
drivers/power/supply/Makefile | 1 +
drivers/power/supply/generic-usb-charger.c | 140 +++++++++++++++++++++
3 files changed, 148 insertions(+)
create mode 100644 drivers/power/supply/generic-usb-charger.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index c84a7b1caeb6..069a91d89a42 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -51,6 +51,13 @@ config GENERIC_ADC_BATTERY
Say Y here to enable support for the generic battery driver
which uses IIO framework to read adc.
+config GENERIC_USB_CHARGER
+ tristate "Generic USB charger"
+ depends on USB_PHY
+ help
+ Say Y here to enable a generic USB charger driver which uses
+ the USB PHY framework to detect the presence of the charger.
+
config MAX8925_POWER
tristate "MAX8925 battery charger support"
depends on MFD_MAX8925
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 6c7da920ea83..03f9b553bdfc 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -8,6 +8,7 @@ power_supply-$(CONFIG_LEDS_TRIGGERS) += power_supply_leds.o
obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
+obj-$(CONFIG_GENERIC_USB_CHARGER) += generic-usb-charger.o
obj-$(CONFIG_PDA_POWER) += pda_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
diff --git a/drivers/power/supply/generic-usb-charger.c b/drivers/power/supply/generic-usb-charger.c
new file mode 100644
index 000000000000..d005acfc33c7
--- /dev/null
+++ b/drivers/power/supply/generic-usb-charger.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Simple USB charger driver
+ * Copyright (c) 2019 Paul Cercueil <paul@...pouillou.net>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/usb/phy.h>
+
+struct usb_charger {
+ struct usb_phy *phy;
+ struct notifier_block nb;
+ struct power_supply_desc desc;
+ struct power_supply *charger;
+};
+
+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_charger *charger = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = charger->phy->chg_state == USB_CHARGER_PRESENT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int usb_charger_event(struct notifier_block *nb,
+ unsigned long event, void *d)
+{
+ struct usb_charger *charger = container_of(nb, struct usb_charger, nb);
+
+ power_supply_changed(charger->charger);
+
+ return 0;
+}
+
+static int usb_charger_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct power_supply_desc *desc;
+ struct usb_charger *charger;
+ struct power_supply_config cfg = {
+ .of_node = dev->of_node,
+ };
+ int err;
+
+ charger = devm_kzalloc(dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, charger);
+ charger->nb.notifier_call = usb_charger_event;
+ cfg.drv_data = charger;
+
+ if (dev->of_node)
+ charger->phy = devm_usb_get_phy_by_phandle(dev, "phys", 0);
+ else
+ charger->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(charger->phy)) {
+ err = PTR_ERR(charger->phy);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "No transceiver configured");
+ return err;
+ }
+
+ desc = &charger->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;
+
+ switch (charger->phy->chg_type) {
+ case SDP_TYPE:
+ desc->type = POWER_SUPPLY_TYPE_USB;
+ break;
+ case DCP_TYPE:
+ desc->type = POWER_SUPPLY_TYPE_USB_DCP;
+ break;
+ case CDP_TYPE:
+ desc->type = POWER_SUPPLY_TYPE_USB_CDP;
+ break;
+ case ACA_TYPE:
+ desc->type = POWER_SUPPLY_TYPE_USB_ACA;
+ break;
+ default:
+ desc->type = POWER_SUPPLY_TYPE_UNKNOWN;
+ }
+
+ charger->charger = devm_power_supply_register(dev, desc, &cfg);
+ if (IS_ERR(charger->charger)) {
+ dev_err(dev, "Unable to register charger");
+ return PTR_ERR(charger->charger);
+ }
+
+ return usb_register_notifier(charger->phy, &charger->nb);
+}
+
+static int usb_charger_remove(struct platform_device *pdev)
+{
+ struct usb_charger *charger = platform_get_drvdata(pdev);
+
+ usb_unregister_notifier(charger->phy, &charger->nb);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id usb_charger_of_match[] = {
+ { .compatible = "usb-charger" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, usb_charger_of_match);
+#endif
+
+static struct platform_driver usb_charger_driver = {
+ .driver = {
+ .name = "usb-charger",
+ .of_match_table = of_match_ptr(usb_charger_of_match),
+ },
+ .probe = usb_charger_probe,
+ .remove = usb_charger_remove,
+};
+module_platform_driver(usb_charger_driver);
+
+MODULE_DESCRIPTION("Simple USB charger driver");
+MODULE_AUTHOR("Paul Cercueil <paul@...pouillou.net>");
+MODULE_LICENSE("GPL");
--
2.24.0.rc1
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