diff options
Diffstat (limited to 'drivers/power/supply/max8997_charger.c')
| -rw-r--r-- | drivers/power/supply/max8997_charger.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c new file mode 100644 index 000000000..1ec3535a2 --- /dev/null +++ b/drivers/power/supply/max8997_charger.c @@ -0,0 +1,287 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 +// +// Copyright (C) 2011 Samsung Electronics +// MyungJoo Ham <myungjoo.ham@samsung.com> + +#include <linux/err.h> +#include <linux/extcon.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/mfd/max8997.h> +#include <linux/mfd/max8997-private.h> +#include <linux/regulator/consumer.h> +#include <linux/devm-helpers.h> + +/* MAX8997_REG_STATUS4 */ +#define DCINOK_SHIFT 1 +#define DCINOK_MASK (1 << DCINOK_SHIFT) +#define DETBAT_SHIFT 2 +#define DETBAT_MASK (1 << DETBAT_SHIFT) + +/* MAX8997_REG_MBCCTRL1 */ +#define TFCH_SHIFT 4 +#define TFCH_MASK (7 << TFCH_SHIFT) + +/* MAX8997_REG_MBCCTRL5 */ +#define ITOPOFF_SHIFT 0 +#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT) + +struct charger_data { + struct device *dev; + struct max8997_dev *iodev; + struct power_supply *battery; + struct regulator *reg; + struct extcon_dev *edev; + struct notifier_block extcon_nb; + struct work_struct extcon_work; +}; + +static enum power_supply_property max8997_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */ + POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ + POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ +}; + +/* Note that the charger control is done by a current regulator "CHARGER" */ +static int max8997_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct charger_data *charger = power_supply_get_drvdata(psy); + struct i2c_client *i2c = charger->iodev->i2c; + int ret; + u8 reg; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + if ((reg & (1 << 0)) == 0x1) + val->intval = POWER_SUPPLY_STATUS_FULL; + else if ((reg & DCINOK_MASK)) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + if ((reg & DETBAT_MASK) == 0x0) + val->intval = 1; + + break; + case POWER_SUPPLY_PROP_ONLINE: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + if (reg & DCINOK_MASK) + val->intval = 1; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static void max8997_battery_extcon_evt_worker(struct work_struct *work) +{ + struct charger_data *charger = + container_of(work, struct charger_data, extcon_work); + struct extcon_dev *edev = charger->edev; + int current_limit; + + if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) { + dev_dbg(charger->dev, "USB SDP charger is connected\n"); + current_limit = 450000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) { + dev_dbg(charger->dev, "USB DCP charger is connected\n"); + current_limit = 650000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) { + dev_dbg(charger->dev, "USB FAST charger is connected\n"); + current_limit = 650000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) { + dev_dbg(charger->dev, "USB SLOW charger is connected\n"); + current_limit = 650000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) { + dev_dbg(charger->dev, "USB CDP charger is connected\n"); + current_limit = 650000; + } else { + dev_dbg(charger->dev, "USB charger is disconnected\n"); + current_limit = -1; + } + + if (current_limit > 0) { + int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit); + + if (ret) { + dev_err(charger->dev, "failed to set current limit: %d\n", ret); + return; + } + ret = regulator_enable(charger->reg); + if (ret) + dev_err(charger->dev, "failed to enable regulator: %d\n", ret); + } else { + int ret = regulator_disable(charger->reg); + + if (ret) + dev_err(charger->dev, "failed to disable regulator: %d\n", ret); + } +} + +static int max8997_battery_extcon_evt(struct notifier_block *nb, + unsigned long event, void *param) +{ + struct charger_data *charger = + container_of(nb, struct charger_data, extcon_nb); + schedule_work(&charger->extcon_work); + return NOTIFY_OK; +} + +static const struct power_supply_desc max8997_battery_desc = { + .name = "max8997_pmic", + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = max8997_battery_get_property, + .properties = max8997_battery_props, + .num_properties = ARRAY_SIZE(max8997_battery_props), +}; + +static int max8997_battery_probe(struct platform_device *pdev) +{ + int ret = 0; + struct charger_data *charger; + struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct device_node *np = pdev->dev.of_node; + struct i2c_client *i2c = iodev->i2c; + struct max8997_platform_data *pdata = iodev->pdata; + struct power_supply_config psy_cfg = {}; + + if (!pdata) { + dev_err(&pdev->dev, "No platform data supplied.\n"); + return -EINVAL; + } + + if (pdata->eoc_mA) { + int val = (pdata->eoc_mA - 50) / 10; + if (val < 0) + val = 0; + if (val > 0xf) + val = 0xf; + + ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5, + val << ITOPOFF_SHIFT, ITOPOFF_MASK); + if (ret < 0) { + dev_err(&pdev->dev, "Cannot use i2c bus.\n"); + return ret; + } + } + switch (pdata->timeout) { + case 5: + ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, + 0x2 << TFCH_SHIFT, TFCH_MASK); + break; + case 6: + ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, + 0x3 << TFCH_SHIFT, TFCH_MASK); + break; + case 7: + ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, + 0x4 << TFCH_SHIFT, TFCH_MASK); + break; + case 0: + ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, + 0x7 << TFCH_SHIFT, TFCH_MASK); + break; + default: + dev_err(&pdev->dev, "incorrect timeout value (%d)\n", + pdata->timeout); + return -EINVAL; + } + if (ret < 0) { + dev_err(&pdev->dev, "Cannot use i2c bus.\n"); + return ret; + } + + charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); + if (!charger) + return -ENOMEM; + + platform_set_drvdata(pdev, charger); + + charger->dev = &pdev->dev; + charger->iodev = iodev; + + psy_cfg.drv_data = charger; + + charger->battery = devm_power_supply_register(&pdev->dev, + &max8997_battery_desc, + &psy_cfg); + if (IS_ERR(charger->battery)) { + dev_err(&pdev->dev, "failed: power supply register\n"); + return PTR_ERR(charger->battery); + } + + // grab regulator from parent device's node + pdev->dev.of_node = iodev->dev->of_node; + charger->reg = devm_regulator_get_optional(&pdev->dev, "charger"); + pdev->dev.of_node = np; + if (IS_ERR(charger->reg)) { + if (PTR_ERR(charger->reg) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_info(&pdev->dev, "couldn't get charger regulator\n"); + } + charger->edev = extcon_get_extcon_dev("max8997-muic"); + if (IS_ERR(charger->edev)) { + dev_err_probe(charger->dev, PTR_ERR(charger->edev), + "couldn't get extcon device: max8997-muic\n"); + return PTR_ERR(charger->edev); + } + + if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) { + ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work, + max8997_battery_extcon_evt_worker); + if (ret) { + dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret); + return ret; + } + charger->extcon_nb.notifier_call = max8997_battery_extcon_evt; + ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev, + &charger->extcon_nb); + if (ret) { + dev_err(&pdev->dev, "failed to register extcon notifier\n"); + return ret; + } + } + + return 0; +} + +static const struct platform_device_id max8997_battery_id[] = { + { "max8997-battery", 0 }, + { } +}; +MODULE_DEVICE_TABLE(platform, max8997_battery_id); + +static struct platform_driver max8997_battery_driver = { + .driver = { + .name = "max8997-battery", + }, + .probe = max8997_battery_probe, + .id_table = max8997_battery_id, +}; +module_platform_driver(max8997_battery_driver); + +MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_LICENSE("GPL"); |