diff options
Diffstat (limited to 'drivers/power/supply/rt5033_charger.c')
| -rw-r--r-- | drivers/power/supply/rt5033_charger.c | 320 |
1 files changed, 299 insertions, 21 deletions
diff --git a/drivers/power/supply/rt5033_charger.c b/drivers/power/supply/rt5033_charger.c index c0c516f22c..d19c7e80a9 100644 --- a/drivers/power/supply/rt5033_charger.c +++ b/drivers/power/supply/rt5033_charger.c @@ -6,8 +6,12 @@ * Author: Beomho Seo <beomho.seo@samsung.com> */ +#include <linux/devm-helpers.h> +#include <linux/extcon.h> #include <linux/mod_devicetable.h> #include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/regmap.h> @@ -25,7 +29,15 @@ struct rt5033_charger { struct device *dev; struct regmap *regmap; struct power_supply *psy; - struct rt5033_charger_data *chg; + struct rt5033_charger_data chg; + struct extcon_dev *edev; + struct notifier_block extcon_nb; + struct work_struct extcon_work; + struct mutex lock; + bool online; + bool otg; + bool mivr_enabled; + u8 cv_regval; }; static int rt5033_get_charger_state(struct rt5033_charger *charger) @@ -56,6 +68,10 @@ static int rt5033_get_charger_state(struct rt5033_charger *charger) state = POWER_SUPPLY_STATUS_UNKNOWN; } + /* For OTG mode, RT5033 would still report "charging" */ + if (charger->otg) + state = POWER_SUPPLY_STATUS_DISCHARGING; + return state; } @@ -115,7 +131,7 @@ static int rt5033_get_charger_const_voltage(struct rt5033_charger *charger) static inline int rt5033_init_const_charge(struct rt5033_charger *charger) { - struct rt5033_charger_data *chg = charger->chg; + struct rt5033_charger_data *chg = &charger->chg; int ret; unsigned int val; u8 reg_data; @@ -147,6 +163,9 @@ static inline int rt5033_init_const_charge(struct rt5033_charger *charger) return -EINVAL; } + /* Store that value for later usage */ + charger->cv_regval = reg_data; + /* Set end of charge current */ if (chg->eoc_uamp < RT5033_CHARGER_EOC_MIN || chg->eoc_uamp > RT5033_CHARGER_EOC_MAX) { @@ -186,7 +205,7 @@ static inline int rt5033_init_const_charge(struct rt5033_charger *charger) static inline int rt5033_init_fast_charge(struct rt5033_charger *charger) { - struct rt5033_charger_data *chg = charger->chg; + struct rt5033_charger_data *chg = &charger->chg; int ret; unsigned int val; u8 reg_data; @@ -231,7 +250,7 @@ static inline int rt5033_init_fast_charge(struct rt5033_charger *charger) static inline int rt5033_init_pre_charge(struct rt5033_charger *charger) { - struct rt5033_charger_data *chg = charger->chg; + struct rt5033_charger_data *chg = &charger->chg; int ret; unsigned int val; u8 reg_data; @@ -330,6 +349,162 @@ static int rt5033_charger_reg_init(struct rt5033_charger *charger) return 0; } +static int rt5033_charger_set_otg(struct rt5033_charger *charger) +{ + int ret; + + mutex_lock(&charger->lock); + + /* Set OTG boost v_out to 5 volts */ + ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2, + RT5033_CHGCTRL2_CV_MASK, + 0x37 << RT5033_CHGCTRL2_CV_SHIFT); + if (ret) { + dev_err(charger->dev, "Failed set OTG boost v_out\n"); + ret = -EINVAL; + goto out_unlock; + } + + /* Set operation mode to OTG */ + ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1, + RT5033_CHGCTRL1_MODE_MASK, RT5033_BOOST_MODE); + if (ret) { + dev_err(charger->dev, "Failed to update OTG mode.\n"); + ret = -EINVAL; + goto out_unlock; + } + + /* In case someone switched from charging to OTG directly */ + if (charger->online) + charger->online = false; + + charger->otg = true; + +out_unlock: + mutex_unlock(&charger->lock); + + return ret; +} + +static int rt5033_charger_unset_otg(struct rt5033_charger *charger) +{ + int ret; + u8 data; + + /* Restore constant voltage for charging */ + data = charger->cv_regval; + ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2, + RT5033_CHGCTRL2_CV_MASK, + data << RT5033_CHGCTRL2_CV_SHIFT); + if (ret) { + dev_err(charger->dev, "Failed to restore constant voltage\n"); + return -EINVAL; + } + + /* Set operation mode to charging */ + ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1, + RT5033_CHGCTRL1_MODE_MASK, RT5033_CHARGER_MODE); + if (ret) { + dev_err(charger->dev, "Failed to update charger mode.\n"); + return -EINVAL; + } + + charger->otg = false; + + return 0; +} + +static int rt5033_charger_set_charging(struct rt5033_charger *charger) +{ + int ret; + + mutex_lock(&charger->lock); + + /* In case someone switched from OTG to charging directly */ + if (charger->otg) { + ret = rt5033_charger_unset_otg(charger); + if (ret) { + mutex_unlock(&charger->lock); + return -EINVAL; + } + } + + charger->online = true; + + mutex_unlock(&charger->lock); + + return 0; +} + +static int rt5033_charger_set_mivr(struct rt5033_charger *charger) +{ + int ret; + + mutex_lock(&charger->lock); + + /* + * When connected via USB connector type SDP (Standard Downstream Port), + * the minimum input voltage regulation (MIVR) should be enabled. It + * prevents an input voltage drop due to insufficient current provided + * by the adapter or USB input. As a downside, it may reduces the + * charging current and thus slows the charging. + */ + ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4, + RT5033_CHGCTRL4_MIVR_MASK, RT5033_CHARGER_MIVR_4600MV); + if (ret) { + dev_err(charger->dev, "Failed to set MIVR level.\n"); + mutex_unlock(&charger->lock); + return -EINVAL; + } + + charger->mivr_enabled = true; + + mutex_unlock(&charger->lock); + + /* Beyond this, do the same steps like setting charging */ + rt5033_charger_set_charging(charger); + + return 0; +} + +static int rt5033_charger_set_disconnect(struct rt5033_charger *charger) +{ + int ret = 0; + + mutex_lock(&charger->lock); + + /* Disable MIVR if enabled */ + if (charger->mivr_enabled) { + ret = regmap_update_bits(charger->regmap, + RT5033_REG_CHG_CTRL4, + RT5033_CHGCTRL4_MIVR_MASK, + RT5033_CHARGER_MIVR_DISABLE); + if (ret) { + dev_err(charger->dev, "Failed to disable MIVR.\n"); + ret = -EINVAL; + goto out_unlock; + } + + charger->mivr_enabled = false; + } + + if (charger->otg) { + ret = rt5033_charger_unset_otg(charger); + if (ret) { + ret = -EINVAL; + goto out_unlock; + } + } + + if (charger->online) + charger->online = false; + +out_unlock: + mutex_unlock(&charger->lock); + + return ret; +} + static enum power_supply_property rt5033_charger_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CHARGE_TYPE, @@ -366,8 +541,7 @@ static int rt5033_charger_get_property(struct power_supply *psy, val->strval = RT5033_MANUFACTURER; break; case POWER_SUPPLY_PROP_ONLINE: - val->intval = (rt5033_get_charger_state(charger) == - POWER_SUPPLY_STATUS_CHARGING); + val->intval = charger->online; break; default: return -EINVAL; @@ -376,21 +550,16 @@ static int rt5033_charger_get_property(struct power_supply *psy, return 0; } -static struct rt5033_charger_data *rt5033_charger_dt_init( - struct rt5033_charger *charger) +static int rt5033_charger_dt_init(struct rt5033_charger *charger) { - struct rt5033_charger_data *chg; + struct rt5033_charger_data *chg = &charger->chg; struct power_supply_battery_info *info; int ret; - chg = devm_kzalloc(charger->dev, sizeof(*chg), GFP_KERNEL); - if (!chg) - return ERR_PTR(-ENOMEM); - ret = power_supply_get_battery_info(charger->psy, &info); if (ret) - return ERR_PTR(dev_err_probe(charger->dev, -EINVAL, - "missing battery info\n")); + return dev_err_probe(charger->dev, -EINVAL, + "missing battery info\n"); /* Assign data. Validity will be checked in the init functions. */ chg->pre_uamp = info->precharge_current_ua; @@ -399,7 +568,87 @@ static struct rt5033_charger_data *rt5033_charger_dt_init( chg->pre_uvolt = info->precharge_voltage_max_uv; chg->const_uvolt = info->constant_charge_voltage_max_uv; - return chg; + return 0; +} + +static void rt5033_charger_extcon_work(struct work_struct *work) +{ + struct rt5033_charger *charger = + container_of(work, struct rt5033_charger, extcon_work); + struct extcon_dev *edev = charger->edev; + int connector, state; + int ret; + + for (connector = EXTCON_USB_HOST; connector <= EXTCON_CHG_USB_PD; + connector++) { + state = extcon_get_state(edev, connector); + if (state == 1) + break; + } + + /* + * Adding a delay between extcon notification and extcon action. This + * makes extcon action execution more reliable. Without the delay the + * execution sometimes fails, possibly because the chip is busy or not + * ready. + */ + msleep(100); + + switch (connector) { + case EXTCON_CHG_USB_SDP: + ret = rt5033_charger_set_mivr(charger); + if (ret) { + dev_err(charger->dev, "failed to set USB mode\n"); + break; + } + dev_info(charger->dev, "USB mode. connector type: %d\n", + connector); + break; + case EXTCON_CHG_USB_DCP: + case EXTCON_CHG_USB_CDP: + case EXTCON_CHG_USB_ACA: + case EXTCON_CHG_USB_FAST: + case EXTCON_CHG_USB_SLOW: + case EXTCON_CHG_WPT: + case EXTCON_CHG_USB_PD: + ret = rt5033_charger_set_charging(charger); + if (ret) { + dev_err(charger->dev, "failed to set charging\n"); + break; + } + dev_info(charger->dev, "charging. connector type: %d\n", + connector); + break; + case EXTCON_USB_HOST: + ret = rt5033_charger_set_otg(charger); + if (ret) { + dev_err(charger->dev, "failed to set OTG\n"); + break; + } + dev_info(charger->dev, "OTG enabled\n"); + break; + default: + ret = rt5033_charger_set_disconnect(charger); + if (ret) { + dev_err(charger->dev, "failed to set disconnect\n"); + break; + } + dev_info(charger->dev, "disconnected\n"); + break; + } + + power_supply_changed(charger->psy); +} + +static int rt5033_charger_extcon_notifier(struct notifier_block *nb, + unsigned long event, void *param) +{ + struct rt5033_charger *charger = + container_of(nb, struct rt5033_charger, extcon_nb); + + schedule_work(&charger->extcon_work); + + return NOTIFY_OK; } static const struct power_supply_desc rt5033_charger_desc = { @@ -414,6 +663,7 @@ static int rt5033_charger_probe(struct platform_device *pdev) { struct rt5033_charger *charger; struct power_supply_config psy_cfg = {}; + struct device_node *np_conn, *np_edev; int ret; charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); @@ -423,25 +673,53 @@ static int rt5033_charger_probe(struct platform_device *pdev) platform_set_drvdata(pdev, charger); charger->dev = &pdev->dev; charger->regmap = dev_get_regmap(pdev->dev.parent, NULL); + mutex_init(&charger->lock); psy_cfg.of_node = pdev->dev.of_node; psy_cfg.drv_data = charger; - charger->psy = devm_power_supply_register(&pdev->dev, + charger->psy = devm_power_supply_register(charger->dev, &rt5033_charger_desc, &psy_cfg); if (IS_ERR(charger->psy)) - return dev_err_probe(&pdev->dev, PTR_ERR(charger->psy), + return dev_err_probe(charger->dev, PTR_ERR(charger->psy), "Failed to register power supply\n"); - charger->chg = rt5033_charger_dt_init(charger); - if (IS_ERR_OR_NULL(charger->chg)) - return PTR_ERR(charger->chg); + ret = rt5033_charger_dt_init(charger); + if (ret) + return ret; ret = rt5033_charger_reg_init(charger); if (ret) return ret; + /* + * Extcon support is not vital for the charger to work. If no extcon + * is available, just emit a warning and leave the probe function. + */ + np_conn = of_parse_phandle(pdev->dev.of_node, "richtek,usb-connector", 0); + np_edev = of_get_parent(np_conn); + charger->edev = extcon_find_edev_by_node(np_edev); + if (IS_ERR(charger->edev)) { + dev_warn(charger->dev, "no extcon device found in device-tree\n"); + goto out; + } + + ret = devm_work_autocancel(charger->dev, &charger->extcon_work, + rt5033_charger_extcon_work); + if (ret) { + dev_err(charger->dev, "failed to initialize extcon work\n"); + return ret; + } + + charger->extcon_nb.notifier_call = rt5033_charger_extcon_notifier; + ret = devm_extcon_register_notifier_all(charger->dev, charger->edev, + &charger->extcon_nb); + if (ret) { + dev_err(charger->dev, "failed to register extcon notifier\n"); + return ret; + } +out: return 0; } |