288 lines
7.8 KiB
C
288 lines
7.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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//
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// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
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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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#include <linux/err.h>
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#include <linux/extcon.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/max8997.h>
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#include <linux/mfd/max8997-private.h>
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#include <linux/regulator/consumer.h>
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#include <linux/devm-helpers.h>
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/* MAX8997_REG_STATUS4 */
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#define DCINOK_SHIFT 1
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#define DCINOK_MASK (1 << DCINOK_SHIFT)
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#define DETBAT_SHIFT 2
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#define DETBAT_MASK (1 << DETBAT_SHIFT)
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/* MAX8997_REG_MBCCTRL1 */
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#define TFCH_SHIFT 4
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#define TFCH_MASK (7 << TFCH_SHIFT)
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/* MAX8997_REG_MBCCTRL5 */
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#define ITOPOFF_SHIFT 0
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#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
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struct charger_data {
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struct device *dev;
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struct max8997_dev *iodev;
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struct power_supply *battery;
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struct regulator *reg;
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struct extcon_dev *edev;
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struct notifier_block extcon_nb;
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struct work_struct extcon_work;
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};
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static enum power_supply_property max8997_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
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POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
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POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
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};
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/* Note that the charger control is done by a current regulator "CHARGER" */
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static int max8997_battery_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 charger_data *charger = power_supply_get_drvdata(psy);
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struct i2c_client *i2c = charger->iodev->i2c;
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int ret;
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u8 reg;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = 0;
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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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if (ret)
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return ret;
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if ((reg & (1 << 0)) == 0x1)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else if ((reg & DCINOK_MASK))
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 0;
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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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if (ret)
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return ret;
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if ((reg & DETBAT_MASK) == 0x0)
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val->intval = 1;
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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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ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
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if (ret)
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return ret;
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if (reg & DCINOK_MASK)
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val->intval = 1;
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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 void max8997_battery_extcon_evt_worker(struct work_struct *work)
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{
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struct charger_data *charger =
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container_of(work, struct charger_data, extcon_work);
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struct extcon_dev *edev = charger->edev;
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int current_limit;
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if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
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dev_dbg(charger->dev, "USB SDP charger is connected\n");
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current_limit = 450000;
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} else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
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dev_dbg(charger->dev, "USB DCP charger is connected\n");
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current_limit = 650000;
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} else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
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dev_dbg(charger->dev, "USB FAST charger is connected\n");
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current_limit = 650000;
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} else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
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dev_dbg(charger->dev, "USB SLOW charger is connected\n");
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current_limit = 650000;
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} else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
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dev_dbg(charger->dev, "USB CDP charger is connected\n");
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current_limit = 650000;
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} else {
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dev_dbg(charger->dev, "USB charger is disconnected\n");
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current_limit = -1;
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}
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if (current_limit > 0) {
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int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
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if (ret) {
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dev_err(charger->dev, "failed to set current limit: %d\n", ret);
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return;
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}
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ret = regulator_enable(charger->reg);
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if (ret)
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dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
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} else {
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int ret = regulator_disable(charger->reg);
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if (ret)
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dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
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}
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}
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static int max8997_battery_extcon_evt(struct notifier_block *nb,
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unsigned long event, void *param)
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{
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struct charger_data *charger =
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container_of(nb, struct charger_data, extcon_nb);
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schedule_work(&charger->extcon_work);
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return NOTIFY_OK;
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}
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static const struct power_supply_desc max8997_battery_desc = {
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.name = "max8997_pmic",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = max8997_battery_get_property,
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.properties = max8997_battery_props,
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.num_properties = ARRAY_SIZE(max8997_battery_props),
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};
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static int max8997_battery_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct charger_data *charger;
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struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct device_node *np = pdev->dev.of_node;
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struct i2c_client *i2c = iodev->i2c;
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struct max8997_platform_data *pdata = iodev->pdata;
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struct power_supply_config psy_cfg = {};
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data supplied.\n");
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return -EINVAL;
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}
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if (pdata->eoc_mA) {
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int val = (pdata->eoc_mA - 50) / 10;
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if (val < 0)
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val = 0;
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if (val > 0xf)
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val = 0xf;
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ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
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val << ITOPOFF_SHIFT, ITOPOFF_MASK);
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if (ret < 0) {
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dev_err(&pdev->dev, "Cannot use i2c bus.\n");
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return ret;
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}
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}
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switch (pdata->timeout) {
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case 5:
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ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
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0x2 << TFCH_SHIFT, TFCH_MASK);
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break;
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case 6:
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ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
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0x3 << TFCH_SHIFT, TFCH_MASK);
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break;
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case 7:
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ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
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0x4 << TFCH_SHIFT, TFCH_MASK);
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break;
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case 0:
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ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
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0x7 << TFCH_SHIFT, TFCH_MASK);
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break;
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default:
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dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
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pdata->timeout);
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return -EINVAL;
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}
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if (ret < 0) {
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dev_err(&pdev->dev, "Cannot use i2c bus.\n");
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return ret;
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}
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charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
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if (!charger)
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return -ENOMEM;
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platform_set_drvdata(pdev, charger);
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charger->dev = &pdev->dev;
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charger->iodev = iodev;
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psy_cfg.drv_data = charger;
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charger->battery = devm_power_supply_register(&pdev->dev,
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&max8997_battery_desc,
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&psy_cfg);
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if (IS_ERR(charger->battery)) {
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dev_err(&pdev->dev, "failed: power supply register\n");
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return PTR_ERR(charger->battery);
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}
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// grab regulator from parent device's node
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pdev->dev.of_node = iodev->dev->of_node;
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charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
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pdev->dev.of_node = np;
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if (IS_ERR(charger->reg)) {
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if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_info(&pdev->dev, "couldn't get charger regulator\n");
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}
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charger->edev = extcon_get_extcon_dev("max8997-muic");
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if (IS_ERR(charger->edev)) {
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dev_err_probe(charger->dev, PTR_ERR(charger->edev),
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"couldn't get extcon device: max8997-muic\n");
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return PTR_ERR(charger->edev);
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}
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if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
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ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
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max8997_battery_extcon_evt_worker);
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if (ret) {
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dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
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return ret;
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}
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charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
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ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
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&charger->extcon_nb);
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if (ret) {
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dev_err(&pdev->dev, "failed to register extcon notifier\n");
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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 platform_device_id max8997_battery_id[] = {
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{ "max8997-battery", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, max8997_battery_id);
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static struct platform_driver max8997_battery_driver = {
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.driver = {
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.name = "max8997-battery",
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},
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.probe = max8997_battery_probe,
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.id_table = max8997_battery_id,
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};
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module_platform_driver(max8997_battery_driver);
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MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_LICENSE("GPL");
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