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423 lines
11 KiB
423 lines
11 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_ALIAS("platform:max8903-charger");
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