424 lines
11 KiB
C
424 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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#include <linux/power_supply.h>
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#include <linux/platform_device.h>
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struct max8903_data {
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struct device *dev;
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struct power_supply *psy;
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struct power_supply_desc psy_desc;
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/*
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* GPIOs
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* chg, flt, dcm and usus are optional.
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* dok or uok must be present.
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* If dok is present, cen must be present.
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*/
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struct gpio_desc *cen; /* Charger Enable input */
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struct gpio_desc *dok; /* DC (Adapter) Power OK output */
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struct gpio_desc *uok; /* USB Power OK output */
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struct gpio_desc *chg; /* Charger status output */
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struct gpio_desc *flt; /* Fault output */
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struct gpio_desc *dcm; /* Current-Limit Mode input (1: DC, 2: USB) */
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struct gpio_desc *usus; /* USB Suspend Input (1: suspended) */
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bool fault;
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bool usb_in;
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bool ta_in;
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};
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static enum power_supply_property max8903_charger_props[] = {
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POWER_SUPPLY_PROP_STATUS, /* Charger status output */
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POWER_SUPPLY_PROP_ONLINE, /* External power source */
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POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
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};
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static int max8903_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct max8903_data *data = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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if (data->chg) {
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if (gpiod_get_value(data->chg))
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/* CHG asserted */
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else if (data->usb_in || data->ta_in)
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = 0;
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if (data->usb_in || data->ta_in)
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val->intval = 1;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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if (data->fault)
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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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 irqreturn_t max8903_dcin(int irq, void *_data)
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{
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struct max8903_data *data = _data;
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bool ta_in;
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enum power_supply_type old_type;
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/*
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* This means the line is asserted.
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*
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* The signal is active low, but the inversion is handled in the GPIO
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* library as the line should be flagged GPIO_ACTIVE_LOW in the device
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* tree.
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*/
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ta_in = gpiod_get_value(data->dok);
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if (ta_in == data->ta_in)
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return IRQ_HANDLED;
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data->ta_in = ta_in;
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/* Set Current-Limit-Mode 1:DC 0:USB */
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if (data->dcm)
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gpiod_set_value(data->dcm, ta_in);
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/* Charger Enable / Disable */
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if (data->cen) {
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int val;
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if (ta_in)
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/* Certainly enable if DOK is asserted */
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val = 1;
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else if (data->usb_in)
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/* Enable if the USB charger is enabled */
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val = 1;
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else
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/* Else default-disable */
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val = 0;
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gpiod_set_value(data->cen, val);
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}
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dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
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"Connected" : "Disconnected");
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old_type = data->psy_desc.type;
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if (data->ta_in)
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data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
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else if (data->usb_in)
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data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
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else
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data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
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if (old_type != data->psy_desc.type)
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power_supply_changed(data->psy);
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return IRQ_HANDLED;
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}
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static irqreturn_t max8903_usbin(int irq, void *_data)
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{
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struct max8903_data *data = _data;
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bool usb_in;
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enum power_supply_type old_type;
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/*
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* This means the line is asserted.
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*
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* The signal is active low, but the inversion is handled in the GPIO
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* library as the line should be flagged GPIO_ACTIVE_LOW in the device
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* tree.
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*/
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usb_in = gpiod_get_value(data->uok);
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if (usb_in == data->usb_in)
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return IRQ_HANDLED;
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data->usb_in = usb_in;
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/* Do not touch Current-Limit-Mode */
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/* Charger Enable / Disable */
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if (data->cen) {
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int val;
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if (usb_in)
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/* Certainly enable if UOK is asserted */
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val = 1;
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else if (data->ta_in)
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/* Enable if the DC charger is enabled */
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val = 1;
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else
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/* Else default-disable */
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val = 0;
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gpiod_set_value(data->cen, val);
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}
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dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
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"Connected" : "Disconnected");
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old_type = data->psy_desc.type;
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if (data->ta_in)
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data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
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else if (data->usb_in)
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data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
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else
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data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
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if (old_type != data->psy_desc.type)
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power_supply_changed(data->psy);
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return IRQ_HANDLED;
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}
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static irqreturn_t max8903_fault(int irq, void *_data)
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{
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struct max8903_data *data = _data;
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bool fault;
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/*
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* This means the line is asserted.
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*
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* The signal is active low, but the inversion is handled in the GPIO
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* library as the line should be flagged GPIO_ACTIVE_LOW in the device
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* tree.
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*/
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fault = gpiod_get_value(data->flt);
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if (fault == data->fault)
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return IRQ_HANDLED;
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data->fault = fault;
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if (fault)
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dev_err(data->dev, "Charger suffers a fault and stops.\n");
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else
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dev_err(data->dev, "Charger recovered from a fault.\n");
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return IRQ_HANDLED;
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}
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static int max8903_setup_gpios(struct platform_device *pdev)
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{
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struct max8903_data *data = platform_get_drvdata(pdev);
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struct device *dev = &pdev->dev;
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bool ta_in = false;
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bool usb_in = false;
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enum gpiod_flags flags;
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data->dok = devm_gpiod_get_optional(dev, "dok", GPIOD_IN);
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if (IS_ERR(data->dok))
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return dev_err_probe(dev, PTR_ERR(data->dok),
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"failed to get DOK GPIO");
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if (data->dok) {
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gpiod_set_consumer_name(data->dok, data->psy_desc.name);
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/*
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* The DC OK is pulled up to 1 and goes low when a charger
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* is plugged in (active low) but in the device tree the
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* line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
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* here if the DC charger is plugged in.
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*/
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ta_in = gpiod_get_value(data->dok);
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}
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data->uok = devm_gpiod_get_optional(dev, "uok", GPIOD_IN);
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if (IS_ERR(data->uok))
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return dev_err_probe(dev, PTR_ERR(data->uok),
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"failed to get UOK GPIO");
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if (data->uok) {
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gpiod_set_consumer_name(data->uok, data->psy_desc.name);
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/*
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* The USB OK is pulled up to 1 and goes low when a USB charger
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* is plugged in (active low) but in the device tree the
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* line is marked as GPIO_ACTIVE_LOW so we get a 1 (asserted)
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* here if the USB charger is plugged in.
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*/
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usb_in = gpiod_get_value(data->uok);
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}
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/* Either DC OK or USB OK must be provided */
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if (!data->dok && !data->uok) {
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dev_err(dev, "no valid power source\n");
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return -EINVAL;
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}
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/*
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* If either charger is already connected at this point,
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* assert the CEN line and enable charging from the start.
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*
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* The line is active low but also marked with GPIO_ACTIVE_LOW
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* in the device tree, so when we assert the line with
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* GPIOD_OUT_HIGH the line will be driven low.
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*/
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flags = (ta_in || usb_in) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
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/*
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* If DC OK is provided, Charger Enable CEN is compulsory
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* so this is not optional here.
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*/
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data->cen = devm_gpiod_get(dev, "cen", flags);
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if (IS_ERR(data->cen))
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return dev_err_probe(dev, PTR_ERR(data->cen),
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"failed to get CEN GPIO");
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gpiod_set_consumer_name(data->cen, data->psy_desc.name);
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/*
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* If the DC charger is connected, then select it.
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*
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* The DCM line should be marked GPIO_ACTIVE_HIGH in the
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* device tree. Driving it high will enable the DC charger
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* input over the USB charger input.
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*/
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flags = ta_in ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
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data->dcm = devm_gpiod_get_optional(dev, "dcm", flags);
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if (IS_ERR(data->dcm))
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return dev_err_probe(dev, PTR_ERR(data->dcm),
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"failed to get DCM GPIO");
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gpiod_set_consumer_name(data->dcm, data->psy_desc.name);
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data->chg = devm_gpiod_get_optional(dev, "chg", GPIOD_IN);
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if (IS_ERR(data->chg))
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return dev_err_probe(dev, PTR_ERR(data->chg),
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"failed to get CHG GPIO");
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gpiod_set_consumer_name(data->chg, data->psy_desc.name);
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data->flt = devm_gpiod_get_optional(dev, "flt", GPIOD_IN);
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if (IS_ERR(data->flt))
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return dev_err_probe(dev, PTR_ERR(data->flt),
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"failed to get FLT GPIO");
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gpiod_set_consumer_name(data->flt, data->psy_desc.name);
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data->usus = devm_gpiod_get_optional(dev, "usus", GPIOD_IN);
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if (IS_ERR(data->usus))
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return dev_err_probe(dev, PTR_ERR(data->usus),
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"failed to get USUS GPIO");
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gpiod_set_consumer_name(data->usus, data->psy_desc.name);
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data->fault = false;
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data->ta_in = ta_in;
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data->usb_in = usb_in;
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return 0;
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}
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static int max8903_probe(struct platform_device *pdev)
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{
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struct max8903_data *data;
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struct device *dev = &pdev->dev;
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struct power_supply_config psy_cfg = {};
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int ret = 0;
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data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->dev = dev;
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platform_set_drvdata(pdev, data);
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ret = max8903_setup_gpios(pdev);
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if (ret)
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return ret;
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data->psy_desc.name = "max8903_charger";
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data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
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((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
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POWER_SUPPLY_TYPE_BATTERY);
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data->psy_desc.get_property = max8903_get_property;
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data->psy_desc.properties = max8903_charger_props;
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data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
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psy_cfg.of_node = dev->of_node;
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psy_cfg.drv_data = data;
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data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
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if (IS_ERR(data->psy)) {
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dev_err(dev, "failed: power supply register.\n");
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return PTR_ERR(data->psy);
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}
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if (data->dok) {
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ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->dok),
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NULL, max8903_dcin,
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IRQF_TRIGGER_FALLING |
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"MAX8903 DC IN", data);
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if (ret) {
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dev_err(dev, "Cannot request irq %d for DC (%d)\n",
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gpiod_to_irq(data->dok), ret);
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return ret;
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}
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}
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if (data->uok) {
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ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->uok),
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NULL, max8903_usbin,
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IRQF_TRIGGER_FALLING |
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"MAX8903 USB IN", data);
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if (ret) {
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dev_err(dev, "Cannot request irq %d for USB (%d)\n",
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gpiod_to_irq(data->uok), ret);
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return ret;
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}
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}
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if (data->flt) {
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ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->flt),
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NULL, max8903_fault,
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IRQF_TRIGGER_FALLING |
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"MAX8903 Fault", data);
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if (ret) {
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dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
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gpiod_to_irq(data->flt), ret);
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return ret;
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}
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}
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return 0;
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}
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static const struct of_device_id max8903_match_ids[] = {
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{ .compatible = "maxim,max8903", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, max8903_match_ids);
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static struct platform_driver max8903_driver = {
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.probe = max8903_probe,
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.driver = {
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.name = "max8903-charger",
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.of_match_table = max8903_match_ids
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},
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};
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module_platform_driver(max8903_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MAX8903 Charger Driver");
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_ALIAS("platform:max8903-charger");
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