cbf9077e58
The max8903_charger.h file indicated that dcm and dok were not optional when dc_valid is set. It makes sense to have dok as a compulsory pin when dc_valid is given. However dcm can be optionally wired to a fixed level especially when the circuit is configured for dc power exclusively. The previous implementation already allowed for this somewhat, however no error was given if dok wasn't given whilst dc_valid was. The new implementation enforces dok presence when dc_valid is given. Whilst allowing dcm to be optional. Signed-off-by: Chris Lapa <chris@lapa.com.au> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
349 lines
8.5 KiB
C
349 lines
8.5 KiB
C
/*
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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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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 (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_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 (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 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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int gpio;
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int ta_in = 0;
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int usb_in = 0;
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if (pdata == NULL) {
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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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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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data->pdata = pdev->dev.platform_data;
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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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if (pdata->dc_valid) {
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if (pdata->dok && gpio_is_valid(pdata->dok)) {
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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 (pdata->dcm) {
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if (gpio_is_valid(pdata->dcm)) {
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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, "Invalid pin: dcm.\n");
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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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_desc.name = "max8903_charger";
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data->psy_desc.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_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.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 (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 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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},
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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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