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power: supply: Add ltc3651-charger driver
The LTC3651 reports its status via GPIO lines. This driver translates the GPIO levels to battery charger status information via sysfs. It relies on devicetree to supply the IO configuration. Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Mike Looijmans
Sebastian Reichel
parent
9d556bb4ad
commit
c94d4ed017
@ -408,6 +408,13 @@ config CHARGER_MANAGER
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runtime and in suspend-to-RAM by waking up the system periodically
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with help of suspend_again support.
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config CHARGER_LTC3651
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tristate "LTC3651 charger"
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depends on GPIOLIB
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help
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Say Y to include support for the LTC3651 battery charger which reports
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its status via GPIO lines.
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config CHARGER_MAX14577
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tristate "Maxim MAX14577/77836 battery charger driver"
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depends on MFD_MAX14577
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@ -61,6 +61,7 @@ obj-$(CONFIG_CHARGER_LP8727) += lp8727_charger.o
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obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o
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obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
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obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
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obj-$(CONFIG_CHARGER_LTC3651) += ltc3651-charger.o
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obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
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obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
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obj-$(CONFIG_CHARGER_MAX77693) += max77693_charger.o
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210
drivers/power/supply/ltc3651-charger.c
Normal file
210
drivers/power/supply/ltc3651-charger.c
Normal file
@ -0,0 +1,210 @@
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/*
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* Copyright (C) 2017, Topic Embedded Products
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* Driver for LTC3651 charger IC.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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struct ltc3651_charger {
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struct power_supply *charger;
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struct power_supply_desc charger_desc;
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struct gpio_desc *acpr_gpio;
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struct gpio_desc *fault_gpio;
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struct gpio_desc *chrg_gpio;
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};
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static irqreturn_t ltc3651_charger_irq(int irq, void *devid)
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{
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struct power_supply *charger = devid;
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power_supply_changed(charger);
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return IRQ_HANDLED;
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}
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static inline struct ltc3651_charger *psy_to_ltc3651_charger(
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struct power_supply *psy)
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{
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return power_supply_get_drvdata(psy);
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}
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static int ltc3651_charger_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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struct ltc3651_charger *ltc3651_charger = psy_to_ltc3651_charger(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (!ltc3651_charger->chrg_gpio) {
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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break;
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}
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if (gpiod_get_value(ltc3651_charger->chrg_gpio))
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = gpiod_get_value(ltc3651_charger->acpr_gpio);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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if (!ltc3651_charger->fault_gpio) {
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val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
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break;
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}
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if (!gpiod_get_value(ltc3651_charger->fault_gpio)) {
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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}
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/*
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* If the fault pin is active, the chrg pin explains the type
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* of failure.
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*/
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if (!ltc3651_charger->chrg_gpio) {
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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break;
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}
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val->intval = gpiod_get_value(ltc3651_charger->chrg_gpio) ?
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POWER_SUPPLY_HEALTH_OVERHEAT :
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POWER_SUPPLY_HEALTH_DEAD;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property ltc3651_charger_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_HEALTH,
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};
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static int ltc3651_charger_probe(struct platform_device *pdev)
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{
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struct power_supply_config psy_cfg = {};
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struct ltc3651_charger *ltc3651_charger;
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struct power_supply_desc *charger_desc;
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int ret;
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ltc3651_charger = devm_kzalloc(&pdev->dev, sizeof(*ltc3651_charger),
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GFP_KERNEL);
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if (!ltc3651_charger)
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return -ENOMEM;
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ltc3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
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"lltc,acpr", GPIOD_IN);
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if (IS_ERR(ltc3651_charger->acpr_gpio)) {
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ret = PTR_ERR(ltc3651_charger->charger);
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dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
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return ret;
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}
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ltc3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
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"lltc,fault", GPIOD_IN);
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if (IS_ERR(ltc3651_charger->fault_gpio)) {
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ret = PTR_ERR(ltc3651_charger->charger);
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dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
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return ret;
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}
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ltc3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
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"lltc,chrg", GPIOD_IN);
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if (IS_ERR(ltc3651_charger->chrg_gpio)) {
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ret = PTR_ERR(ltc3651_charger->charger);
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dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
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return ret;
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}
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charger_desc = <c3651_charger->charger_desc;
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charger_desc->name = pdev->dev.of_node->name;
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charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
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charger_desc->properties = ltc3651_charger_properties;
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charger_desc->num_properties = ARRAY_SIZE(ltc3651_charger_properties);
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charger_desc->get_property = ltc3651_charger_get_property;
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psy_cfg.of_node = pdev->dev.of_node;
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psy_cfg.drv_data = ltc3651_charger;
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ltc3651_charger->charger = devm_power_supply_register(&pdev->dev,
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charger_desc, &psy_cfg);
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if (IS_ERR(ltc3651_charger->charger)) {
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ret = PTR_ERR(ltc3651_charger->charger);
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dev_err(&pdev->dev, "Failed to register power supply: %d\n",
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ret);
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return ret;
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}
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/*
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* Acquire IRQs for the GPIO pins if possible. If the system does not
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* support IRQs on these pins, userspace will have to poll the sysfs
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* files manually.
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*/
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if (ltc3651_charger->acpr_gpio) {
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ret = gpiod_to_irq(ltc3651_charger->acpr_gpio);
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if (ret >= 0)
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ret = devm_request_any_context_irq(&pdev->dev, ret,
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ltc3651_charger_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), ltc3651_charger->charger);
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if (ret < 0)
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dev_warn(&pdev->dev, "Failed to request acpr irq\n");
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}
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if (ltc3651_charger->fault_gpio) {
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ret = gpiod_to_irq(ltc3651_charger->fault_gpio);
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if (ret >= 0)
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ret = devm_request_any_context_irq(&pdev->dev, ret,
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ltc3651_charger_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), ltc3651_charger->charger);
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if (ret < 0)
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dev_warn(&pdev->dev, "Failed to request fault irq\n");
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}
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if (ltc3651_charger->chrg_gpio) {
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ret = gpiod_to_irq(ltc3651_charger->chrg_gpio);
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if (ret >= 0)
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ret = devm_request_any_context_irq(&pdev->dev, ret,
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ltc3651_charger_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), ltc3651_charger->charger);
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if (ret < 0)
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dev_warn(&pdev->dev, "Failed to request chrg irq\n");
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}
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platform_set_drvdata(pdev, ltc3651_charger);
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return 0;
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}
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static const struct of_device_id ltc3651_charger_match[] = {
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{ .compatible = "lltc,ltc3651-charger" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ltc3651_charger_match);
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static struct platform_driver ltc3651_charger_driver = {
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.probe = ltc3651_charger_probe,
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.driver = {
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.name = "ltc3651-charger",
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.of_match_table = ltc3651_charger_match,
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},
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};
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module_platform_driver(ltc3651_charger_driver);
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MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
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MODULE_DESCRIPTION("Driver for LTC3651 charger");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ltc3651-charger");
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