211 lines
6 KiB
C
Executable file
211 lines
6 KiB
C
Executable file
/*
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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->acpr_gpio);
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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->fault_gpio);
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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->chrg_gpio);
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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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