// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Spreadtrum Communications Inc. #include #include #include #include #include #include #include /* PMIC global registers definition */ #define SC2731_CHARGE_STATUS 0xedc #define SC2731_CHARGE_FULL BIT(4) #define SC2731_MODULE_EN1 0xc0c #define SC2731_CHARGE_EN BIT(5) /* SC2731 switch charger registers definition */ #define SC2731_CHG_CFG0 0x0 #define SC2731_CHG_CFG1 0x4 #define SC2731_CHG_CFG2 0x8 #define SC2731_CHG_CFG3 0xc #define SC2731_CHG_CFG4 0x10 #define SC2731_CHG_CFG5 0x28 /* SC2731_CHG_CFG0 register definition */ #define SC2731_PRECHG_RNG_SHIFT 11 #define SC2731_PRECHG_RNG_MASK GENMASK(12, 11) #define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1) #define SC2731_TERMINATION_VOL_SHIFT 1 #define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3) #define SC2731_TERMINATION_VOL_CAL_SHIFT 3 #define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0) #define SC2731_CC_EN BIT(13) #define SC2731_CHARGER_PD BIT(0) /* SC2731_CHG_CFG1 register definition */ #define SC2731_CUR_MASK GENMASK(5, 0) /* SC2731_CHG_CFG5 register definition */ #define SC2731_CUR_LIMIT_SHIFT 8 #define SC2731_CUR_LIMIT_MASK GENMASK(9, 8) /* Default current definition (unit is mA) */ #define SC2731_CURRENT_LIMIT_100 100 #define SC2731_CURRENT_LIMIT_500 500 #define SC2731_CURRENT_LIMIT_900 900 #define SC2731_CURRENT_LIMIT_2000 2000 #define SC2731_CURRENT_PRECHG 450 #define SC2731_CURRENT_STEP 50 struct sc2731_charger_info { struct device *dev; struct regmap *regmap; struct usb_phy *usb_phy; struct notifier_block usb_notify; struct power_supply *psy_usb; struct work_struct work; struct mutex lock; bool charging; u32 base; u32 limit; }; static void sc2731_charger_stop_charge(struct sc2731_charger_info *info) { regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_CC_EN, 0); regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_CHARGER_PD, SC2731_CHARGER_PD); } static int sc2731_charger_start_charge(struct sc2731_charger_info *info) { int ret; /* Enable charger constant current mode */ ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_CC_EN, SC2731_CC_EN); if (ret) return ret; /* Start charging */ return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_CHARGER_PD, 0); } static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info, u32 limit) { u32 val; if (limit <= SC2731_CURRENT_LIMIT_100) val = 0; else if (limit <= SC2731_CURRENT_LIMIT_500) val = 3; else if (limit <= SC2731_CURRENT_LIMIT_900) val = 2; else val = 1; return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5, SC2731_CUR_LIMIT_MASK, val << SC2731_CUR_LIMIT_SHIFT); } static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur) { u32 val; int ret; if (cur > SC2731_CURRENT_LIMIT_2000) cur = SC2731_CURRENT_LIMIT_2000; else if (cur < SC2731_CURRENT_PRECHG) cur = SC2731_CURRENT_PRECHG; /* Calculate the step value, each step is 50 mA */ val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP; /* Set pre-charge current as 450 mA */ ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_PRECHG_RNG_MASK, 0x3 << SC2731_PRECHG_RNG_SHIFT); if (ret) return ret; return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1, SC2731_CUR_MASK, val); } static int sc2731_charger_get_status(struct sc2731_charger_info *info) { u32 val; int ret; ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val); if (ret) return ret; if (val & SC2731_CHARGE_FULL) return POWER_SUPPLY_STATUS_FULL; return POWER_SUPPLY_STATUS_CHARGING; } static int sc2731_charger_get_current(struct sc2731_charger_info *info, u32 *cur) { int ret; u32 val; ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val); if (ret) return ret; val &= SC2731_CUR_MASK; *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG; return 0; } static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info, u32 *cur) { int ret; u32 val; ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val); if (ret) return ret; val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT; switch (val) { case 0: *cur = SC2731_CURRENT_LIMIT_100; break; case 1: *cur = SC2731_CURRENT_LIMIT_2000; break; case 2: *cur = SC2731_CURRENT_LIMIT_900; break; case 3: *cur = SC2731_CURRENT_LIMIT_500; break; default: return -EINVAL; } return 0; } static int sc2731_charger_usb_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct sc2731_charger_info *info = power_supply_get_drvdata(psy); int ret; mutex_lock(&info->lock); if (!info->charging) { mutex_unlock(&info->lock); return -ENODEV; } switch (psp) { case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: ret = sc2731_charger_set_current(info, val->intval / 1000); if (ret < 0) dev_err(info->dev, "set charge current failed\n"); break; case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: ret = sc2731_charger_set_current_limit(info, val->intval / 1000); if (ret < 0) dev_err(info->dev, "set input current limit failed\n"); break; default: ret = -EINVAL; } mutex_unlock(&info->lock); return ret; } static int sc2731_charger_usb_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct sc2731_charger_info *info = power_supply_get_drvdata(psy); int ret = 0; u32 cur; mutex_lock(&info->lock); switch (psp) { case POWER_SUPPLY_PROP_STATUS: if (info->charging) val->intval = sc2731_charger_get_status(info); else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: if (!info->charging) { val->intval = 0; } else { ret = sc2731_charger_get_current(info, &cur); if (ret) goto out; val->intval = cur * 1000; } break; case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: if (!info->charging) { val->intval = 0; } else { ret = sc2731_charger_get_current_limit(info, &cur); if (ret) goto out; val->intval = cur * 1000; } break; default: ret = -EINVAL; } out: mutex_unlock(&info->lock); return ret; } static int sc2731_charger_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { int ret; switch (psp) { case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: ret = 1; break; default: ret = 0; } return ret; } static enum power_supply_property sc2731_usb_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, }; static const struct power_supply_desc sc2731_charger_desc = { .name = "sc2731_charger", .type = POWER_SUPPLY_TYPE_USB, .properties = sc2731_usb_props, .num_properties = ARRAY_SIZE(sc2731_usb_props), .get_property = sc2731_charger_usb_get_property, .set_property = sc2731_charger_usb_set_property, .property_is_writeable = sc2731_charger_property_is_writeable, }; static void sc2731_charger_work(struct work_struct *data) { struct sc2731_charger_info *info = container_of(data, struct sc2731_charger_info, work); int ret; mutex_lock(&info->lock); if (info->limit > 0 && !info->charging) { /* set current limitation and start to charge */ ret = sc2731_charger_set_current_limit(info, info->limit); if (ret) goto out; ret = sc2731_charger_set_current(info, info->limit); if (ret) goto out; ret = sc2731_charger_start_charge(info); if (ret) goto out; info->charging = true; } else if (!info->limit && info->charging) { /* Stop charging */ info->charging = false; sc2731_charger_stop_charge(info); } out: mutex_unlock(&info->lock); } static int sc2731_charger_usb_change(struct notifier_block *nb, unsigned long limit, void *data) { struct sc2731_charger_info *info = container_of(nb, struct sc2731_charger_info, usb_notify); info->limit = limit; schedule_work(&info->work); return NOTIFY_OK; } static int sc2731_charger_hw_init(struct sc2731_charger_info *info) { struct power_supply_battery_info *bat_info; u32 term_currrent, term_voltage, cur_val, vol_val; int ret; /* Enable charger module */ ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, SC2731_CHARGE_EN); if (ret) return ret; ret = power_supply_get_battery_info(info->psy_usb, &bat_info); if (ret) { dev_warn(info->dev, "no battery information is supplied\n"); /* * If no battery information is supplied, we should set * default charge termination current to 120 mA, and default * charge termination voltage to 4.35V. */ cur_val = 0x2; vol_val = 0x1; } else { term_currrent = bat_info->charge_term_current_ua / 1000; if (term_currrent <= 90) cur_val = 0; else if (term_currrent >= 265) cur_val = 0x7; else cur_val = ((term_currrent - 90) / 25) + 1; term_voltage = bat_info->constant_charge_voltage_max_uv / 1000; if (term_voltage > 4500) term_voltage = 4500; if (term_voltage > 4200) vol_val = (term_voltage - 4200) / 100; else vol_val = 0; power_supply_put_battery_info(info->psy_usb, bat_info); } /* Set charge termination current */ ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2, SC2731_TERMINATION_CUR_MASK, cur_val); if (ret) goto error; /* Set charge termination voltage */ ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, SC2731_TERMINATION_VOL_MASK | SC2731_TERMINATION_VOL_CAL_MASK, (vol_val << SC2731_TERMINATION_VOL_SHIFT) | (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT)); if (ret) goto error; return 0; error: regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0); return ret; } static void sc2731_charger_detect_status(struct sc2731_charger_info *info) { unsigned int min, max; /* * If the USB charger status has been USB_CHARGER_PRESENT before * registering the notifier, we should start to charge with getting * the charge current. */ if (info->usb_phy->chg_state != USB_CHARGER_PRESENT) return; usb_phy_get_charger_current(info->usb_phy, &min, &max); info->limit = min; schedule_work(&info->work); } static int sc2731_charger_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct sc2731_charger_info *info; struct power_supply_config charger_cfg = { }; int ret; info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; mutex_init(&info->lock); info->dev = &pdev->dev; INIT_WORK(&info->work, sc2731_charger_work); info->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!info->regmap) { dev_err(&pdev->dev, "failed to get charger regmap\n"); return -ENODEV; } ret = of_property_read_u32(np, "reg", &info->base); if (ret) { dev_err(&pdev->dev, "failed to get register address\n"); return -ENODEV; } charger_cfg.drv_data = info; charger_cfg.of_node = np; info->psy_usb = devm_power_supply_register(&pdev->dev, &sc2731_charger_desc, &charger_cfg); if (IS_ERR(info->psy_usb)) { dev_err(&pdev->dev, "failed to register power supply\n"); return PTR_ERR(info->psy_usb); } ret = sc2731_charger_hw_init(info); if (ret) return ret; info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0); if (IS_ERR(info->usb_phy)) { dev_err(&pdev->dev, "failed to find USB phy\n"); return PTR_ERR(info->usb_phy); } info->usb_notify.notifier_call = sc2731_charger_usb_change; ret = usb_register_notifier(info->usb_phy, &info->usb_notify); if (ret) { dev_err(&pdev->dev, "failed to register notifier: %d\n", ret); return ret; } sc2731_charger_detect_status(info); return 0; } static void sc2731_charger_remove(struct platform_device *pdev) { struct sc2731_charger_info *info = platform_get_drvdata(pdev); usb_unregister_notifier(info->usb_phy, &info->usb_notify); } static const struct of_device_id sc2731_charger_of_match[] = { { .compatible = "sprd,sc2731-charger", }, { } }; MODULE_DEVICE_TABLE(of, sc2731_charger_of_match); static struct platform_driver sc2731_charger_driver = { .driver = { .name = "sc2731-charger", .of_match_table = sc2731_charger_of_match, }, .probe = sc2731_charger_probe, .remove = sc2731_charger_remove, }; module_platform_driver(sc2731_charger_driver); MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver"); MODULE_LICENSE("GPL v2");