| /* |
| * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver |
| * |
| * Copyright (C) 2011 Samsung Electronics |
| * MyungJoo Ham <myungjoo.ham@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/power_supply.h> |
| #include <linux/platform_device.h> |
| #include <linux/power/max8903_charger.h> |
| |
| struct max8903_data { |
| struct max8903_pdata pdata; |
| struct device *dev; |
| struct power_supply psy; |
| bool fault; |
| bool usb_in; |
| bool ta_in; |
| }; |
| |
| static enum power_supply_property max8903_charger_props[] = { |
| POWER_SUPPLY_PROP_STATUS, /* Charger status output */ |
| POWER_SUPPLY_PROP_ONLINE, /* External power source */ |
| POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */ |
| }; |
| |
| static int max8903_get_property(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct max8903_data *data = container_of(psy, |
| struct max8903_data, psy); |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_STATUS: |
| val->intval = POWER_SUPPLY_STATUS_UNKNOWN; |
| if (data->pdata.chg) { |
| if (gpio_get_value(data->pdata.chg) == 0) |
| val->intval = POWER_SUPPLY_STATUS_CHARGING; |
| else if (data->usb_in || data->ta_in) |
| val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| else |
| val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
| } |
| break; |
| case POWER_SUPPLY_PROP_ONLINE: |
| val->intval = 0; |
| if (data->usb_in || data->ta_in) |
| val->intval = 1; |
| break; |
| case POWER_SUPPLY_PROP_HEALTH: |
| val->intval = POWER_SUPPLY_HEALTH_GOOD; |
| if (data->fault) |
| val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static irqreturn_t max8903_dcin(int irq, void *_data) |
| { |
| struct max8903_data *data = _data; |
| struct max8903_pdata *pdata = &data->pdata; |
| bool ta_in; |
| enum power_supply_type old_type; |
| |
| ta_in = gpio_get_value(pdata->dok) ? false : true; |
| |
| if (ta_in == data->ta_in) |
| return IRQ_HANDLED; |
| |
| data->ta_in = ta_in; |
| |
| /* Set Current-Limit-Mode 1:DC 0:USB */ |
| if (pdata->dcm) |
| gpio_set_value(pdata->dcm, ta_in ? 1 : 0); |
| |
| /* Charger Enable / Disable (cen is negated) */ |
| if (pdata->cen) |
| gpio_set_value(pdata->cen, ta_in ? 0 : |
| (data->usb_in ? 0 : 1)); |
| |
| dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ? |
| "Connected" : "Disconnected"); |
| |
| old_type = data->psy.type; |
| |
| if (data->ta_in) |
| data->psy.type = POWER_SUPPLY_TYPE_MAINS; |
| else if (data->usb_in) |
| data->psy.type = POWER_SUPPLY_TYPE_USB; |
| else |
| data->psy.type = POWER_SUPPLY_TYPE_BATTERY; |
| |
| if (old_type != data->psy.type) |
| power_supply_changed(&data->psy); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t max8903_usbin(int irq, void *_data) |
| { |
| struct max8903_data *data = _data; |
| struct max8903_pdata *pdata = &data->pdata; |
| bool usb_in; |
| enum power_supply_type old_type; |
| |
| usb_in = gpio_get_value(pdata->uok) ? false : true; |
| |
| if (usb_in == data->usb_in) |
| return IRQ_HANDLED; |
| |
| data->usb_in = usb_in; |
| |
| /* Do not touch Current-Limit-Mode */ |
| |
| /* Charger Enable / Disable (cen is negated) */ |
| if (pdata->cen) |
| gpio_set_value(pdata->cen, usb_in ? 0 : |
| (data->ta_in ? 0 : 1)); |
| |
| dev_dbg(data->dev, "USB Charger %s.\n", usb_in ? |
| "Connected" : "Disconnected"); |
| |
| old_type = data->psy.type; |
| |
| if (data->ta_in) |
| data->psy.type = POWER_SUPPLY_TYPE_MAINS; |
| else if (data->usb_in) |
| data->psy.type = POWER_SUPPLY_TYPE_USB; |
| else |
| data->psy.type = POWER_SUPPLY_TYPE_BATTERY; |
| |
| if (old_type != data->psy.type) |
| power_supply_changed(&data->psy); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t max8903_fault(int irq, void *_data) |
| { |
| struct max8903_data *data = _data; |
| struct max8903_pdata *pdata = &data->pdata; |
| bool fault; |
| |
| fault = gpio_get_value(pdata->flt) ? false : true; |
| |
| if (fault == data->fault) |
| return IRQ_HANDLED; |
| |
| data->fault = fault; |
| |
| if (fault) |
| dev_err(data->dev, "Charger suffers a fault and stops.\n"); |
| else |
| dev_err(data->dev, "Charger recovered from a fault.\n"); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int max8903_probe(struct platform_device *pdev) |
| { |
| struct max8903_data *data; |
| struct device *dev = &pdev->dev; |
| struct max8903_pdata *pdata = pdev->dev.platform_data; |
| int ret = 0; |
| int gpio; |
| int ta_in = 0; |
| int usb_in = 0; |
| |
| data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL); |
| if (data == NULL) { |
| dev_err(dev, "Cannot allocate memory.\n"); |
| return -ENOMEM; |
| } |
| memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata)); |
| data->dev = dev; |
| platform_set_drvdata(pdev, data); |
| |
| if (pdata->dc_valid == false && pdata->usb_valid == false) { |
| dev_err(dev, "No valid power sources.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| if (pdata->dc_valid) { |
| if (pdata->dok && gpio_is_valid(pdata->dok) && |
| pdata->dcm && gpio_is_valid(pdata->dcm)) { |
| gpio = pdata->dok; /* PULL_UPed Interrupt */ |
| ta_in = gpio_get_value(gpio) ? 0 : 1; |
| |
| gpio = pdata->dcm; /* Output */ |
| gpio_set_value(gpio, ta_in); |
| } else { |
| dev_err(dev, "When DC is wired, DOK and DCM should" |
| " be wired as well.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } else { |
| if (pdata->dcm) { |
| if (gpio_is_valid(pdata->dcm)) |
| gpio_set_value(pdata->dcm, 0); |
| else { |
| dev_err(dev, "Invalid pin: dcm.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| } |
| |
| if (pdata->usb_valid) { |
| if (pdata->uok && gpio_is_valid(pdata->uok)) { |
| gpio = pdata->uok; |
| usb_in = gpio_get_value(gpio) ? 0 : 1; |
| } else { |
| dev_err(dev, "When USB is wired, UOK should be wired." |
| "as well.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| |
| if (pdata->cen) { |
| if (gpio_is_valid(pdata->cen)) { |
| gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1); |
| } else { |
| dev_err(dev, "Invalid pin: cen.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| |
| if (pdata->chg) { |
| if (!gpio_is_valid(pdata->chg)) { |
| dev_err(dev, "Invalid pin: chg.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| |
| if (pdata->flt) { |
| if (!gpio_is_valid(pdata->flt)) { |
| dev_err(dev, "Invalid pin: flt.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| |
| if (pdata->usus) { |
| if (!gpio_is_valid(pdata->usus)) { |
| dev_err(dev, "Invalid pin: usus.\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| } |
| |
| data->fault = false; |
| data->ta_in = ta_in; |
| data->usb_in = usb_in; |
| |
| data->psy.name = "max8903_charger"; |
| data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS : |
| ((usb_in) ? POWER_SUPPLY_TYPE_USB : |
| POWER_SUPPLY_TYPE_BATTERY); |
| data->psy.get_property = max8903_get_property; |
| data->psy.properties = max8903_charger_props; |
| data->psy.num_properties = ARRAY_SIZE(max8903_charger_props); |
| |
| ret = power_supply_register(dev, &data->psy, NULL); |
| if (ret) { |
| dev_err(dev, "failed: power supply register.\n"); |
| goto err; |
| } |
| |
| if (pdata->dc_valid) { |
| ret = request_threaded_irq(gpio_to_irq(pdata->dok), |
| NULL, max8903_dcin, |
| IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| "MAX8903 DC IN", data); |
| if (ret) { |
| dev_err(dev, "Cannot request irq %d for DC (%d)\n", |
| gpio_to_irq(pdata->dok), ret); |
| goto err_psy; |
| } |
| } |
| |
| if (pdata->usb_valid) { |
| ret = request_threaded_irq(gpio_to_irq(pdata->uok), |
| NULL, max8903_usbin, |
| IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| "MAX8903 USB IN", data); |
| if (ret) { |
| dev_err(dev, "Cannot request irq %d for USB (%d)\n", |
| gpio_to_irq(pdata->uok), ret); |
| goto err_dc_irq; |
| } |
| } |
| |
| if (pdata->flt) { |
| ret = request_threaded_irq(gpio_to_irq(pdata->flt), |
| NULL, max8903_fault, |
| IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| "MAX8903 Fault", data); |
| if (ret) { |
| dev_err(dev, "Cannot request irq %d for Fault (%d)\n", |
| gpio_to_irq(pdata->flt), ret); |
| goto err_usb_irq; |
| } |
| } |
| |
| return 0; |
| |
| err_usb_irq: |
| if (pdata->usb_valid) |
| free_irq(gpio_to_irq(pdata->uok), data); |
| err_dc_irq: |
| if (pdata->dc_valid) |
| free_irq(gpio_to_irq(pdata->dok), data); |
| err_psy: |
| power_supply_unregister(&data->psy); |
| err: |
| return ret; |
| } |
| |
| static int max8903_remove(struct platform_device *pdev) |
| { |
| struct max8903_data *data = platform_get_drvdata(pdev); |
| |
| if (data) { |
| struct max8903_pdata *pdata = &data->pdata; |
| |
| if (pdata->flt) |
| free_irq(gpio_to_irq(pdata->flt), data); |
| if (pdata->usb_valid) |
| free_irq(gpio_to_irq(pdata->uok), data); |
| if (pdata->dc_valid) |
| free_irq(gpio_to_irq(pdata->dok), data); |
| power_supply_unregister(&data->psy); |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver max8903_driver = { |
| .probe = max8903_probe, |
| .remove = max8903_remove, |
| .driver = { |
| .name = "max8903-charger", |
| }, |
| }; |
| |
| module_platform_driver(max8903_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("MAX8903 Charger Driver"); |
| MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| MODULE_ALIAS("platform:max8903-charger"); |