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[83.8.128.191]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a626cc500a1sm798430166b.125.2024.05.30.01.56.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 01:56:34 -0700 (PDT) From: Artur Weber Date: Thu, 30 May 2024 10:55:57 +0200 Subject: [PATCH RFC 07/11] power: supply: max77693: Add USB extcon detection for enabling charging Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240530-max77693-charger-extcon-v1-7-dc2a9e5bdf30@gmail.com> References: <20240530-max77693-charger-extcon-v1-0-dc2a9e5bdf30@gmail.com> In-Reply-To: <20240530-max77693-charger-extcon-v1-0-dc2a9e5bdf30@gmail.com> To: Krzysztof Kozlowski , Chanwoo Choi Cc: Sebastian Reichel , Rob Herring , Conor Dooley , Lee Jones , Krzysztof Kozlowski , Alim Akhtar , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Henrik Grimler , Wolfgang Wiedmeyer , Denis 'GNUtoo' Carikli , Artur Weber X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1717059384; l=6243; i=aweber.kernel@gmail.com; s=20231030; h=from:subject:message-id; bh=Z6Uakaaf2pR7w6gR2fxAZJMtvGZtTD0SN8W+EmCqsME=; b=/otuVyG+MYAQnvYq6pnSJfAJ2q8SAm6E1XDwZh46SvFbfocSd7ZsDnbIlnKCkSUoFJXIwbMsP SZVtRrM6cbfBl2IPwVU770VsZIghjYMdO6Rl3TxBTSXkrPox15roc9Y X-Developer-Key: i=aweber.kernel@gmail.com; a=ed25519; pk=RhDBfWbJEHqDibXbhNEBAnc9FMkyznGxX/hwfhL8bv8= Add a device tree property, "maxim,usb-connector", that can be used to specify a USB connector to use to detect whether a charging cable has been plugged in/out, and enable/disable charging accordingly. To accommodate this, also add an internal pointer to the CHARGER regulator, which is used to enable/disable charging and set the input current limit (which will be done in subsequent commits). The extcon listener/worker implementation is inspired by the rt5033_charger driver. Signed-off-by: Artur Weber --- drivers/power/supply/Kconfig | 1 + drivers/power/supply/max77693_charger.c | 125 ++++++++++++++++++++++++++++++++ 2 files changed, 126 insertions(+) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index 3e31375491d5..e4aeff9e7ad1 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -549,6 +549,7 @@ config CHARGER_MAX77650 config CHARGER_MAX77693 tristate "Maxim MAX77693 battery charger driver" depends on MFD_MAX77693 + depends on EXTCON || !EXTCON help Say Y to enable support for the Maxim MAX77693 battery charger. diff --git a/drivers/power/supply/max77693_charger.c b/drivers/power/supply/max77693_charger.c index d59b1524b0a4..c2e8ae367381 100644 --- a/drivers/power/supply/max77693_charger.c +++ b/drivers/power/supply/max77693_charger.c @@ -5,6 +5,8 @@ // Copyright (C) 2014 Samsung Electronics // Krzysztof Kozlowski +#include +#include #include #include #include @@ -30,6 +32,13 @@ struct max77693_charger { u32 batttery_overcurrent; u32 fast_charge_current; u32 charge_input_threshold_volt; + + /* USB cable notifications */ + struct { + struct extcon_dev *edev; + struct notifier_block nb; + struct work_struct work; + } cable; }; static int max77693_get_charger_state(struct regmap *regmap, int *val) @@ -711,16 +720,109 @@ static int max77693_reg_init(struct max77693_charger *chg) chg->charge_input_threshold_volt); } +static int max77693_set_charging(struct max77693_charger *chg, bool enable) +{ + int is_enabled; + int ret = 0; + + is_enabled = regulator_is_enabled(chg->regu); + if (is_enabled < 0) + return is_enabled; + + if (enable && !is_enabled) + ret = regulator_enable(chg->regu); + else if (!enable && is_enabled) + ret = regulator_disable(chg->regu); + + return ret; +} + +static void max77693_charger_extcon_work(struct work_struct *work) +{ + struct max77693_charger *chg = container_of(work, struct max77693_charger, + cable.work); + struct extcon_dev *edev = chg->cable.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; + } + + switch (connector) { + case EXTCON_CHG_USB_SDP: + 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_USB_PD: + ret = max77693_set_charging(chg, true); + if (ret) { + dev_err(chg->dev, "failed to enable charging\n"); + break; + } + dev_info(chg->dev, "charging. connector type: %d\n", + connector); + break; + default: + ret = max77693_set_charging(chg, false); + if (ret) { + dev_err(chg->dev, "failed to disable charging\n"); + break; + } + dev_info(chg->dev, "charging. connector type: %d\n", + connector); + break; + } + + power_supply_changed(chg->charger); +} + +static int max77693_charger_extcon_notifier(struct notifier_block *nb, + unsigned long event, void *param) +{ + struct max77693_charger *chg = container_of(nb, struct max77693_charger, + cable.nb); + + schedule_work(&chg->cable.work); + + return NOTIFY_OK; +} + #ifdef CONFIG_OF static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) { struct device_node *np = dev->of_node; + struct device_node *np_conn, *np_edev; if (!np) { dev_err(dev, "no charger OF node\n"); return -EINVAL; } + np_conn = of_parse_phandle(np, "maxim,usb-connector", 0); + np_edev = of_get_parent(np_conn); + + chg->cable.edev = extcon_find_edev_by_node(np_edev); + if (IS_ERR(chg->cable.edev)) { + /* + * In case of deferred extcon probe, defer our probe as well + * until it appears. + */ + if (PTR_ERR(chg->cable.edev) == -EPROBE_DEFER) + return PTR_ERR(chg->cable.edev); + /* + * Otherwise, ignore errors (the charger can run without a + * connector provided). + */ + dev_warn(dev, "no extcon device found in device-tree (%ld)\n", + PTR_ERR(chg->cable.edev)); + } + if (of_property_read_u32(np, "maxim,constant-microvolt", &chg->constant_volt)) chg->constant_volt = DEFAULT_CONSTANT_VOLT; @@ -787,6 +889,26 @@ static int max77693_charger_probe(struct platform_device *pdev) psy_cfg.drv_data = chg; + /* Set up extcon if the USB connector node was found */ + if (!IS_ERR(chg->cable.edev)) { + ret = devm_work_autocancel(&pdev->dev, &chg->cable.work, + max77693_charger_extcon_work); + if (ret) { + dev_err(&pdev->dev, "failed: initialize extcon work\n"); + return ret; + } + + chg->cable.nb.notifier_call = max77693_charger_extcon_notifier; + + ret = devm_extcon_register_notifier_all(&pdev->dev, + chg->cable.edev, + &chg->cable.nb); + if (ret) { + dev_err(&pdev->dev, "failed: register extcon notifier\n"); + return ret; + } + } + ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); if (ret) { dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n"); @@ -822,6 +944,9 @@ static int max77693_charger_probe(struct platform_device *pdev) device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); + devm_extcon_unregister_notifier_all(&pdev->dev, chg->cable.edev, + &chg->cable.nb); + return ret; }