Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 248 insertions, 0 deletions

diff --git a/drivers/power/supply/gpio-charger.c b/drivers/power/supply/gpio-charger.c
new file mode 100644
index 000000000..c3f2a9479
--- /dev/null
+++ b/drivers/power/supply/gpio-charger.c
@@ -0,0 +1,248 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *  Driver for chargers which report their online status through a GPIO pin
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/gpio.h> /* For legacy platform data */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/gpio/consumer.h>
+
+#include <linux/power/gpio-charger.h>
+
+struct gpio_charger {
+	unsigned int irq;
+	bool wakeup_enabled;
+
+	struct power_supply *charger;
+	struct power_supply_desc charger_desc;
+	struct gpio_desc *gpiod;
+};
+
+static irqreturn_t gpio_charger_irq(int irq, void *devid)
+{
+	struct power_supply *charger = devid;
+
+	power_supply_changed(charger);
+
+	return IRQ_HANDLED;
+}
+
+static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
+{
+	return power_supply_get_drvdata(psy);
+}
+
+static int gpio_charger_get_property(struct power_supply *psy,
+		enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_type gpio_charger_get_type(struct device *dev)
+{
+	const char *chargetype;
+
+	if (!device_property_read_string(dev, "charger-type", &chargetype)) {
+		if (!strcmp("unknown", chargetype))
+			return POWER_SUPPLY_TYPE_UNKNOWN;
+		if (!strcmp("battery", chargetype))
+			return POWER_SUPPLY_TYPE_BATTERY;
+		if (!strcmp("ups", chargetype))
+			return POWER_SUPPLY_TYPE_UPS;
+		if (!strcmp("mains", chargetype))
+			return POWER_SUPPLY_TYPE_MAINS;
+		if (!strcmp("usb-sdp", chargetype))
+			return POWER_SUPPLY_TYPE_USB;
+		if (!strcmp("usb-dcp", chargetype))
+			return POWER_SUPPLY_TYPE_USB_DCP;
+		if (!strcmp("usb-cdp", chargetype))
+			return POWER_SUPPLY_TYPE_USB_CDP;
+		if (!strcmp("usb-aca", chargetype))
+			return POWER_SUPPLY_TYPE_USB_ACA;
+	}
+	dev_warn(dev, "unknown charger type %s\n", chargetype);
+
+	return POWER_SUPPLY_TYPE_UNKNOWN;
+}
+
+static enum power_supply_property gpio_charger_properties[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int gpio_charger_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct gpio_charger_platform_data *pdata = dev->platform_data;
+	struct power_supply_config psy_cfg = {};
+	struct gpio_charger *gpio_charger;
+	struct power_supply_desc *charger_desc;
+	unsigned long flags;
+	int irq, ret;
+
+	if (!pdata && !dev->of_node) {
+		dev_err(dev, "No platform data\n");
+		return -ENOENT;
+	}
+
+	gpio_charger = devm_kzalloc(dev, sizeof(*gpio_charger), GFP_KERNEL);
+	if (!gpio_charger)
+		return -ENOMEM;
+
+	/*
+	 * This will fetch a GPIO descriptor from device tree, ACPI or
+	 * boardfile descriptor tables. It's good to try this first.
+	 */
+	gpio_charger->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
+
+	/*
+	 * If this fails and we're not using device tree, try the
+	 * legacy platform data method.
+	 */
+	if (IS_ERR(gpio_charger->gpiod) && !dev->of_node) {
+		/* Non-DT: use legacy GPIO numbers */
+		if (!gpio_is_valid(pdata->gpio)) {
+			dev_err(dev, "Invalid gpio pin in pdata\n");
+			return -EINVAL;
+		}
+		flags = GPIOF_IN;
+		if (pdata->gpio_active_low)
+			flags |= GPIOF_ACTIVE_LOW;
+		ret = devm_gpio_request_one(dev, pdata->gpio, flags,
+					    dev_name(dev));
+		if (ret) {
+			dev_err(dev, "Failed to request gpio pin: %d\n", ret);
+			return ret;
+		}
+		/* Then convert this to gpiod for now */
+		gpio_charger->gpiod = gpio_to_desc(pdata->gpio);
+	} else if (IS_ERR(gpio_charger->gpiod)) {
+		/* Just try again if this happens */
+		if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		dev_err(dev, "error getting GPIO descriptor\n");
+		return PTR_ERR(gpio_charger->gpiod);
+	}
+
+	charger_desc = &gpio_charger->charger_desc;
+	charger_desc->properties = gpio_charger_properties;
+	charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
+	charger_desc->get_property = gpio_charger_get_property;
+
+	psy_cfg.of_node = dev->of_node;
+	psy_cfg.drv_data = gpio_charger;
+
+	if (pdata) {
+		charger_desc->name = pdata->name;
+		charger_desc->type = pdata->type;
+		psy_cfg.supplied_to = pdata->supplied_to;
+		psy_cfg.num_supplicants = pdata->num_supplicants;
+	} else {
+		charger_desc->name = dev->of_node->name;
+		charger_desc->type = gpio_charger_get_type(dev);
+	}
+
+	if (!charger_desc->name)
+		charger_desc->name = pdev->name;
+
+	gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
+							   &psy_cfg);
+	if (IS_ERR(gpio_charger->charger)) {
+		ret = PTR_ERR(gpio_charger->charger);
+		dev_err(dev, "Failed to register power supply: %d\n", ret);
+		return ret;
+	}
+
+	irq = gpiod_to_irq(gpio_charger->gpiod);
+	if (irq > 0) {
+		ret = devm_request_any_context_irq(dev, irq, gpio_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(dev), gpio_charger->charger);
+		if (ret < 0)
+			dev_warn(dev, "Failed to request irq: %d\n", ret);
+		else
+			gpio_charger->irq = irq;
+	}
+
+	platform_set_drvdata(pdev, gpio_charger);
+
+	device_init_wakeup(dev, 1);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int gpio_charger_suspend(struct device *dev)
+{
+	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		gpio_charger->wakeup_enabled =
+			!enable_irq_wake(gpio_charger->irq);
+
+	return 0;
+}
+
+static int gpio_charger_resume(struct device *dev)
+{
+	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
+		disable_irq_wake(gpio_charger->irq);
+	power_supply_changed(gpio_charger->charger);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
+		gpio_charger_suspend, gpio_charger_resume);
+
+static const struct of_device_id gpio_charger_match[] = {
+	{ .compatible = "gpio-charger" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, gpio_charger_match);
+
+static struct platform_driver gpio_charger_driver = {
+	.probe = gpio_charger_probe,
+	.driver = {
+		.name = "gpio-charger",
+		.pm = &gpio_charger_pm_ops,
+		.of_match_table = gpio_charger_match,
+	},
+};
+
+module_platform_driver(gpio_charger_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:gpio-charger");