Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 207 insertions, 0 deletions

diff --git a/drivers/power/supply/lt3651-charger.c b/drivers/power/supply/lt3651-charger.c
new file mode 100644
index 0000000000..8de500ffad
--- /dev/null
+++ b/drivers/power/supply/lt3651-charger.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Driver for Analog Devices (Linear Technology) LT3651 charger IC.
+ *  Copyright (C) 2017, Topic Embedded Products
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#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>
+
+struct lt3651_charger {
+	struct power_supply *charger;
+	struct power_supply_desc charger_desc;
+	struct gpio_desc *acpr_gpio;
+	struct gpio_desc *fault_gpio;
+	struct gpio_desc *chrg_gpio;
+};
+
+static irqreturn_t lt3651_charger_irq(int irq, void *devid)
+{
+	struct power_supply *charger = devid;
+
+	power_supply_changed(charger);
+
+	return IRQ_HANDLED;
+}
+
+static inline struct lt3651_charger *psy_to_lt3651_charger(
+	struct power_supply *psy)
+{
+	return power_supply_get_drvdata(psy);
+}
+
+static int lt3651_charger_get_property(struct power_supply *psy,
+		enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct lt3651_charger *lt3651_charger = psy_to_lt3651_charger(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (!lt3651_charger->chrg_gpio) {
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+			break;
+		}
+		if (gpiod_get_value(lt3651_charger->chrg_gpio))
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = gpiod_get_value(lt3651_charger->acpr_gpio);
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (!lt3651_charger->fault_gpio) {
+			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+			break;
+		}
+		if (!gpiod_get_value(lt3651_charger->fault_gpio)) {
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+			break;
+		}
+		/*
+		 * If the fault pin is active, the chrg pin explains the type
+		 * of failure.
+		 */
+		if (!lt3651_charger->chrg_gpio) {
+			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+			break;
+		}
+		val->intval = gpiod_get_value(lt3651_charger->chrg_gpio) ?
+				POWER_SUPPLY_HEALTH_OVERHEAT :
+				POWER_SUPPLY_HEALTH_DEAD;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property lt3651_charger_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_HEALTH,
+};
+
+static int lt3651_charger_probe(struct platform_device *pdev)
+{
+	struct power_supply_config psy_cfg = {};
+	struct lt3651_charger *lt3651_charger;
+	struct power_supply_desc *charger_desc;
+	int ret;
+
+	lt3651_charger = devm_kzalloc(&pdev->dev, sizeof(*lt3651_charger),
+					GFP_KERNEL);
+	if (!lt3651_charger)
+		return -ENOMEM;
+
+	lt3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
+					"lltc,acpr", GPIOD_IN);
+	if (IS_ERR(lt3651_charger->acpr_gpio)) {
+		ret = PTR_ERR(lt3651_charger->acpr_gpio);
+		dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
+		return ret;
+	}
+	lt3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
+					"lltc,fault", GPIOD_IN);
+	if (IS_ERR(lt3651_charger->fault_gpio)) {
+		ret = PTR_ERR(lt3651_charger->fault_gpio);
+		dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
+		return ret;
+	}
+	lt3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
+					"lltc,chrg", GPIOD_IN);
+	if (IS_ERR(lt3651_charger->chrg_gpio)) {
+		ret = PTR_ERR(lt3651_charger->chrg_gpio);
+		dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
+		return ret;
+	}
+
+	charger_desc = &lt3651_charger->charger_desc;
+	charger_desc->name = pdev->dev.of_node->name;
+	charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
+	charger_desc->properties = lt3651_charger_properties;
+	charger_desc->num_properties = ARRAY_SIZE(lt3651_charger_properties);
+	charger_desc->get_property = lt3651_charger_get_property;
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = lt3651_charger;
+
+	lt3651_charger->charger = devm_power_supply_register(&pdev->dev,
+						      charger_desc, &psy_cfg);
+	if (IS_ERR(lt3651_charger->charger)) {
+		ret = PTR_ERR(lt3651_charger->charger);
+		dev_err(&pdev->dev, "Failed to register power supply: %d\n",
+			ret);
+		return ret;
+	}
+
+	/*
+	 * Acquire IRQs for the GPIO pins if possible. If the system does not
+	 * support IRQs on these pins, userspace will have to poll the sysfs
+	 * files manually.
+	 */
+	if (lt3651_charger->acpr_gpio) {
+		ret = gpiod_to_irq(lt3651_charger->acpr_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				lt3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), lt3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request acpr irq\n");
+	}
+	if (lt3651_charger->fault_gpio) {
+		ret = gpiod_to_irq(lt3651_charger->fault_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				lt3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), lt3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request fault irq\n");
+	}
+	if (lt3651_charger->chrg_gpio) {
+		ret = gpiod_to_irq(lt3651_charger->chrg_gpio);
+		if (ret >= 0)
+			ret = devm_request_any_context_irq(&pdev->dev, ret,
+				lt3651_charger_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				dev_name(&pdev->dev), lt3651_charger->charger);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "Failed to request chrg irq\n");
+	}
+
+	platform_set_drvdata(pdev, lt3651_charger);
+
+	return 0;
+}
+
+static const struct of_device_id lt3651_charger_match[] = {
+	{ .compatible = "lltc,ltc3651-charger" }, /* DEPRECATED */
+	{ .compatible = "lltc,lt3651-charger" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lt3651_charger_match);
+
+static struct platform_driver lt3651_charger_driver = {
+	.probe = lt3651_charger_probe,
+	.driver = {
+		.name = "lt3651-charger",
+		.of_match_table = lt3651_charger_match,
+	},
+};
+
+module_platform_driver(lt3651_charger_driver);
+
+MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
+MODULE_DESCRIPTION("Driver for LT3651 charger");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lt3651-charger");