446 lines
10 KiB
C
446 lines
10 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.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/of_gpio.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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#include <linux/power/max8903_charger.h>
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struct max8903_data {
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struct max8903_pdata *pdata;
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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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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 (gpio_is_valid(data->pdata->chg)) {
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if (gpio_get_value(data->pdata->chg) == 0)
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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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struct max8903_pdata *pdata = data->pdata;
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bool ta_in;
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enum power_supply_type old_type;
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ta_in = gpio_get_value(pdata->dok) ? false : true;
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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 (gpio_is_valid(pdata->dcm))
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gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
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/* Charger Enable / Disable (cen is negated) */
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if (gpio_is_valid(pdata->cen))
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gpio_set_value(pdata->cen, ta_in ? 0 :
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(data->usb_in ? 0 : 1));
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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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struct max8903_pdata *pdata = data->pdata;
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bool usb_in;
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enum power_supply_type old_type;
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usb_in = gpio_get_value(pdata->uok) ? false : true;
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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 (cen is negated) */
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if (gpio_is_valid(pdata->cen))
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gpio_set_value(pdata->cen, usb_in ? 0 :
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(data->ta_in ? 0 : 1));
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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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struct max8903_pdata *pdata = data->pdata;
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bool fault;
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fault = gpio_get_value(pdata->flt) ? false : true;
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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 struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct max8903_pdata *pdata = NULL;
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if (!np)
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return NULL;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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pdata->dc_valid = false;
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pdata->usb_valid = false;
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pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
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if (!gpio_is_valid(pdata->cen))
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pdata->cen = -EINVAL;
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pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
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if (!gpio_is_valid(pdata->chg))
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pdata->chg = -EINVAL;
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pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
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if (!gpio_is_valid(pdata->flt))
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pdata->flt = -EINVAL;
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pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
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if (!gpio_is_valid(pdata->usus))
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pdata->usus = -EINVAL;
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pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
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if (!gpio_is_valid(pdata->dcm))
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pdata->dcm = -EINVAL;
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pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
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if (!gpio_is_valid(pdata->dok))
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pdata->dok = -EINVAL;
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else
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pdata->dc_valid = true;
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pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
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if (!gpio_is_valid(pdata->uok))
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pdata->uok = -EINVAL;
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else
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pdata->usb_valid = true;
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return pdata;
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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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struct max8903_pdata *pdata = pdev->dev.platform_data;
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int ret = 0;
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int gpio;
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int ta_in = 0;
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int usb_in = 0;
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if (pdata->dc_valid) {
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if (gpio_is_valid(pdata->dok)) {
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ret = devm_gpio_request(dev, pdata->dok,
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data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for dok: %d err %d\n",
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pdata->dok, ret);
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return ret;
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}
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gpio = pdata->dok; /* PULL_UPed Interrupt */
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ta_in = gpio_get_value(gpio) ? 0 : 1;
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} else {
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dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
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return -EINVAL;
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}
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}
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if (gpio_is_valid(pdata->dcm)) {
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ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for dcm: %d err %d\n",
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pdata->dcm, ret);
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return ret;
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}
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gpio = pdata->dcm; /* Output */
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gpio_set_value(gpio, ta_in);
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}
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if (pdata->usb_valid) {
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if (gpio_is_valid(pdata->uok)) {
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ret = devm_gpio_request(dev, pdata->uok,
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data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for uok: %d err %d\n",
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pdata->uok, ret);
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return ret;
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}
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gpio = pdata->uok;
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usb_in = gpio_get_value(gpio) ? 0 : 1;
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} else {
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dev_err(dev, "When USB is wired, UOK should be wired."
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"as well.\n");
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return -EINVAL;
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}
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}
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if (gpio_is_valid(pdata->cen)) {
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ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for cen: %d err %d\n",
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pdata->cen, ret);
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return ret;
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}
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gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
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}
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if (gpio_is_valid(pdata->chg)) {
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ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for chg: %d err %d\n",
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pdata->chg, ret);
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return ret;
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}
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}
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if (gpio_is_valid(pdata->flt)) {
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ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for flt: %d err %d\n",
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pdata->flt, ret);
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return ret;
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}
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}
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if (gpio_is_valid(pdata->usus)) {
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ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
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if (ret) {
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dev_err(dev,
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"Failed GPIO request for usus: %d err %d\n",
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pdata->usus, ret);
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return ret;
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}
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}
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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 max8903_pdata *pdata = pdev->dev.platform_data;
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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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if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
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pdata = max8903_parse_dt_data(dev);
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if (!pdata) {
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dev_err(dev, "No platform data.\n");
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return -EINVAL;
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}
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pdev->dev.platform_data = pdata;
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data->pdata = pdata;
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data->dev = dev;
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platform_set_drvdata(pdev, data);
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if (pdata->dc_valid == false && pdata->usb_valid == false) {
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dev_err(dev, "No valid power sources.\n");
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return -EINVAL;
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}
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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 (pdata->dc_valid) {
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ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->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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gpio_to_irq(pdata->dok), ret);
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return ret;
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}
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}
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if (pdata->usb_valid) {
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ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->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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gpio_to_irq(pdata->uok), ret);
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return ret;
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}
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}
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if (gpio_is_valid(pdata->flt)) {
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ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->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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gpio_to_irq(pdata->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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