381 lines
9.0 KiB
C
Executable File
381 lines
9.0 KiB
C
Executable File
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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/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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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 = container_of(psy,
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struct max8903_data, 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->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 (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 (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.type;
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if (data->ta_in)
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data->psy.type = POWER_SUPPLY_TYPE_MAINS;
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else if (data->usb_in)
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data->psy.type = POWER_SUPPLY_TYPE_USB;
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else
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data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
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if (old_type != data->psy.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 (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.type;
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if (data->ta_in)
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data->psy.type = POWER_SUPPLY_TYPE_MAINS;
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else if (data->usb_in)
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data->psy.type = POWER_SUPPLY_TYPE_USB;
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else
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data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
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if (old_type != data->psy.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 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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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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data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
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if (data == NULL) {
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dev_err(dev, "Cannot allocate memory.\n");
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return -ENOMEM;
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}
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memcpy(&data->pdata, pdata, sizeof(struct max8903_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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ret = -EINVAL;
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goto err;
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}
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if (pdata->dc_valid) {
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if (pdata->dok && gpio_is_valid(pdata->dok) &&
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pdata->dcm && gpio_is_valid(pdata->dcm)) {
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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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gpio = pdata->dcm; /* Output */
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gpio_set_value(gpio, ta_in);
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} else {
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dev_err(dev, "When DC is wired, DOK and DCM should"
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" be wired as well.\n");
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ret = -EINVAL;
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goto err;
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}
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} else {
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if (pdata->dcm) {
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if (gpio_is_valid(pdata->dcm))
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gpio_set_value(pdata->dcm, 0);
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else {
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dev_err(dev, "Invalid pin: dcm.\n");
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ret = -EINVAL;
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goto err;
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}
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}
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}
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if (pdata->usb_valid) {
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if (pdata->uok && gpio_is_valid(pdata->uok)) {
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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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ret = -EINVAL;
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goto err;
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}
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}
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if (pdata->cen) {
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if (gpio_is_valid(pdata->cen)) {
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gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
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} else {
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dev_err(dev, "Invalid pin: cen.\n");
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ret = -EINVAL;
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goto err;
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}
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}
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if (pdata->chg) {
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if (!gpio_is_valid(pdata->chg)) {
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dev_err(dev, "Invalid pin: chg.\n");
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ret = -EINVAL;
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goto err;
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}
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}
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if (pdata->flt) {
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if (!gpio_is_valid(pdata->flt)) {
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dev_err(dev, "Invalid pin: flt.\n");
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ret = -EINVAL;
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goto err;
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}
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}
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if (pdata->usus) {
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if (!gpio_is_valid(pdata->usus)) {
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dev_err(dev, "Invalid pin: usus.\n");
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ret = -EINVAL;
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goto err;
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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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data->psy.name = "max8903_charger";
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data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
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((usb_in) ? POWER_SUPPLY_TYPE_USB :
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POWER_SUPPLY_TYPE_BATTERY);
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data->psy.get_property = max8903_get_property;
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data->psy.properties = max8903_charger_props;
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data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
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ret = power_supply_register(dev, &data->psy);
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if (ret) {
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dev_err(dev, "failed: power supply register.\n");
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goto err;
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}
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if (pdata->dc_valid) {
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ret = request_threaded_irq(gpio_to_irq(pdata->dok),
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NULL, max8903_dcin,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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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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goto err_psy;
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}
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}
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if (pdata->usb_valid) {
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ret = request_threaded_irq(gpio_to_irq(pdata->uok),
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NULL, max8903_usbin,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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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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goto err_dc_irq;
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}
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}
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if (pdata->flt) {
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ret = request_threaded_irq(gpio_to_irq(pdata->flt),
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NULL, max8903_fault,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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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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goto err_usb_irq;
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}
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}
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return 0;
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err_usb_irq:
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if (pdata->usb_valid)
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free_irq(gpio_to_irq(pdata->uok), data);
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err_dc_irq:
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if (pdata->dc_valid)
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free_irq(gpio_to_irq(pdata->dok), data);
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err_psy:
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power_supply_unregister(&data->psy);
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err:
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return ret;
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}
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static int max8903_remove(struct platform_device *pdev)
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{
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struct max8903_data *data = platform_get_drvdata(pdev);
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if (data) {
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struct max8903_pdata *pdata = &data->pdata;
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if (pdata->flt)
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free_irq(gpio_to_irq(pdata->flt), data);
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if (pdata->usb_valid)
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free_irq(gpio_to_irq(pdata->uok), data);
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if (pdata->dc_valid)
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free_irq(gpio_to_irq(pdata->dok), data);
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power_supply_unregister(&data->psy);
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}
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return 0;
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}
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static struct platform_driver max8903_driver = {
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.probe = max8903_probe,
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.remove = max8903_remove,
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.driver = {
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.name = "max8903-charger",
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.owner = THIS_MODULE,
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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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