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Mon, 05 Jan 2026 09:31:50 -0800 (PST) Received: from draszik.lan ([212.129.74.225]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6507618cc6fsm330165a12.27.2026.01.05.09.31.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Jan 2026 09:31:50 -0800 (PST) Message-ID: <298ca35590d2180fdcf334f94964b6110e17c606.camel@linaro.org> Subject: Re: [PATCH v3 4/5] power: supply: max77759: add charger driver From: =?ISO-8859-1?Q?Andr=E9?= Draszik To: amitsd@google.com, Sebastian Reichel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lee Jones , Greg Kroah-Hartman , Badhri Jagan Sridharan , Heikki Krogerus , Peter Griffin , Tudor Ambarus , Alim Akhtar Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, RD Babiera , Kyle Tso Date: Mon, 05 Jan 2026 17:32:24 +0000 In-Reply-To: <20251227-max77759-charger-v3-4-54e664f5ca92@google.com> References: <20251227-max77759-charger-v3-0-54e664f5ca92@google.com> <20251227-max77759-charger-v3-4-54e664f5ca92@google.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-2+build3 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_093153_287994_6286FA90 X-CRM114-Status: GOOD ( 33.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Amit, I haven't done a full review, but a few things caught my eye. On Sat, 2025-12-27 at 00:04 +0000, Amit Sunil Dhamne via B4 Relay wrote: > From: Amit Sunil Dhamne >=20 > Add support for MAX77759 battery charger driver. This is a 4A 1-Cell > Li+/LiPoly dual input switch mode charger. While the device can support > USB & wireless charger inputs, this implementation only supports USB > input. This implementation supports both buck and boost modes. >=20 > Signed-off-by: Amit Sunil Dhamne > --- > =C2=A0MAINTAINERS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0 6 + > =C2=A0drivers/power/supply/Kconfig=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 11 + > =C2=A0drivers/power/supply/Makefile=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0 1 + > =C2=A0drivers/power/supply/max77759_charger.c | 764 +++++++++++++++++++++= +++++++++++ > =C2=A04 files changed, 782 insertions(+) >=20 > diff --git a/MAINTAINERS b/MAINTAINERS > index dc731d37c8fe..26a9654ab75e 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -15539,6 +15539,12 @@ F: drivers/mfd/max77759.c > =C2=A0F: drivers/nvmem/max77759-nvmem.c > =C2=A0F: include/linux/mfd/max77759.h > =C2=A0 > +MAXIM MAX77759 BATTERY CHARGER DRIVER > +M: Amit Sunil Dhamne > +L: linux-kernel@vger.kernel.org > +S: Maintained > +F: drivers/power/supply/max77759_charger.c > + > =C2=A0MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER > =C2=A0M: Javier Martinez Canillas > =C2=A0L: linux-kernel@vger.kernel.org > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig > index 92f9f7aae92f..e172fd980fde 100644 > --- a/drivers/power/supply/Kconfig > +++ b/drivers/power/supply/Kconfig > @@ -1132,4 +1132,15 @@ config FUEL_GAUGE_MM8013 > =C2=A0 =C2=A0 the state of charge, temperature, cycle count, actual and d= esign > =C2=A0 =C2=A0 capacity, etc. > =C2=A0 > +config CHARGER_MAX77759 > + tristate "MAX77759 Charger Driver" > + depends on MFD_MAX77759 && REGULATOR > + default MFD_MAX77759 > + help > + =C2=A0 Say M or Y here to enable the MAX77759 Charger Driver. MAX77759 > + =C2=A0 charger is a function of the MAX77759 PMIC. This is a dual input > + =C2=A0 switch-mode charger. This driver supports buck and OTG boost mod= es. > + > + =C2=A0 If built as a module, it will be called max77759_charger. > + It might make sense to add this block near the existing MAX77... charger dr= ivers, while updating the tristate string and keeping alphabetical order of entrie= s. > =C2=A0endif # POWER_SUPPLY > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefil= e > index 4b79d5abc49a..6af905875ad5 100644 > --- a/drivers/power/supply/Makefile > +++ b/drivers/power/supply/Makefile > @@ -128,3 +128,4 @@ obj-$(CONFIG_CHARGER_SURFACE) +=3D surface_charger.o > =C2=A0obj-$(CONFIG_BATTERY_UG3105) +=3D ug3105_battery.o > =C2=A0obj-$(CONFIG_CHARGER_QCOM_SMB2) +=3D qcom_smbx.o > =C2=A0obj-$(CONFIG_FUEL_GAUGE_MM8013) +=3D mm8013.o > +obj-$(CONFIG_CHARGER_MAX77759) +=3D max77759_charger.o > diff --git a/drivers/power/supply/max77759_charger.c b/drivers/power/supp= ly/max77759_charger.c > new file mode 100644 > index 000000000000..3d255b069fb9 > --- /dev/null > +++ b/drivers/power/supply/max77759_charger.c > @@ -0,0 +1,764 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * max77759_charger.c - Battery charger driver for MAX77759 charger devi= ce. > + * > + * Copyright 2025 Google LLC. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +/* Default values for Fast Charge Current & Float Voltage */ > +#define CHG_CC_DEFAULT_UA 2266770 > +#define CHG_FV_DEFAULT_MV 4300 > + > +#define FOREACH_IRQ(S) \ > + S(AICL), \ > + S(CHGIN), \ > + S(CHG), \ > + S(INLIM), \ > + S(BAT_OILO), \ > + S(CHG_STA_CC), \ > + S(CHG_STA_CV), \ > + S(CHG_STA_TO), \ > + S(CHG_STA_DONE) > + > +#define GENERATE_ENUM(e) e > +#define GENERATE_STRING(s) #s > + > +enum { > + FOREACH_IRQ(GENERATE_ENUM) > +}; > + > +static const char *const chgr_irqs_str[] =3D { > + FOREACH_IRQ(GENERATE_STRING) > +}; > + > +static int irqs[ARRAY_SIZE(chgr_irqs_str)]; No global variables please, this is not a singleton. > [...] >=20 > +static int set_input_current_limit(struct max77759_charger *chg, int ili= m_ua) > +{ > + u32 regval; > + > + if (ilim_ua < 0) > + return -EINVAL; > + > + if (ilim_ua =3D=3D 0) > + ilim_ua =3D MAX77759_CHGR_CHGIN_ILIM_MIN_UA; > + else if (ilim_ua > MAX77759_CHGR_CHGIN_ILIM_MAX_UA) > + ilim_ua =3D MAX77759_CHGR_CHGIN_ILIM_MAX_UA; What if ilim_ua =3D=3D 1 (or any other value < min_uA)? You could use clamp= () instead of open-coding. > + > + regval =3D val_to_regval(ilim_ua, MAX77759_CHGR_CHGIN_ILIM_MIN_UA, > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MAX77759_CHGR_CHGIN_ILIM_STEP_UA= , > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MAX77759_CHGR_CHGIN_ILIM_REG_OFF= SET); > + return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_09, > + =C2=A0 MAX77759_CHGR_REG_CHG_CNFG_09_CHGIN_ILIM, > + =C2=A0 regval); > +} > + > +static const enum power_supply_property max77759_charger_props[] =3D { > + POWER_SUPPLY_PROP_ONLINE, > + POWER_SUPPLY_PROP_PRESENT, > + POWER_SUPPLY_PROP_STATUS, > + POWER_SUPPLY_PROP_CHARGE_TYPE, > + POWER_SUPPLY_PROP_HEALTH, > + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, > + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, > + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, > +}; > + > +static int max77759_charger_get_property(struct power_supply *psy, > + enum power_supply_property psp, > + union power_supply_propval *pval) > +{ > + struct max77759_charger *chg =3D power_supply_get_drvdata(psy); > + int ret; > + > + switch (psp) { > + case POWER_SUPPLY_PROP_ONLINE: > + ret =3D get_online(chg); > + break; > + case POWER_SUPPLY_PROP_PRESENT: > + ret =3D charger_input_valid(chg); > + break; > + case POWER_SUPPLY_PROP_STATUS: > + ret =3D get_status(chg); > + break; > + case POWER_SUPPLY_PROP_CHARGE_TYPE: > + ret =3D get_charge_type(chg); > + break; > + case POWER_SUPPLY_PROP_HEALTH: > + ret =3D get_health(chg); > + break; > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: > + ret =3D get_fast_charge_current(chg); > + break; > + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: > + ret =3D get_float_voltage(chg); > + break; > + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: > + ret =3D get_input_current_limit(chg); > + break; > + default: > + ret =3D -EINVAL; > + } > + > + pval->intval =3D ret; > + return ret < 0 ? ret : 0; > +} > + > +static const struct power_supply_desc max77759_charger_desc =3D { > + .name =3D "max77759-charger", > + .type =3D POWER_SUPPLY_TYPE_USB, > + .properties =3D max77759_charger_props, > + .num_properties =3D ARRAY_SIZE(max77759_charger_props), > + .get_property =3D max77759_charger_get_property, > +}; > + > +static int charger_set_mode(struct max77759_charger *chg, > + =C2=A0=C2=A0=C2=A0 enum max77759_chgr_mode mode) > +{ > + int ret; > + > + guard(mutex)(&chg->lock); > + > + if (chg->mode =3D=3D mode) > + return 0; > + > + if ((mode =3D=3D MAX77759_CHGR_MODE_CHG_BUCK_ON || > + =C2=A0=C2=A0=C2=A0=C2=A0 mode =3D=3D MAX77759_CHGR_MODE_OTG_BOOST_ON) &= & > + =C2=A0=C2=A0=C2=A0 chg->mode !=3D MAX77759_CHGR_MODE_OFF) { > + dev_err(chg->dev, "Invalid mode transition from %d to %d", > + chg->mode, mode); > + return -EINVAL; > + } > + > + ret =3D regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00, > + MAX77759_CHGR_REG_CHG_CNFG_00_MODE, mode); > + if (ret) > + return ret; > + > + chg->mode =3D mode; > + return 0; > +} > + > +static int enable_chgin_otg(struct regulator_dev *rdev) > +{ > + struct max77759_charger *chg =3D rdev_get_drvdata(rdev); > + > + return charger_set_mode(chg, MAX77759_CHGR_MODE_OTG_BOOST_ON); > +} > + > +static int disable_chgin_otg(struct regulator_dev *rdev) > +{ > + struct max77759_charger *chg =3D rdev_get_drvdata(rdev); > + > + return charger_set_mode(chg, MAX77759_CHGR_MODE_OFF); > +} > + > +static int chgin_otg_status(struct regulator_dev *rdev) > +{ > + struct max77759_charger *chg =3D rdev_get_drvdata(rdev); > + > + guard(mutex)(&chg->lock); > + return chg->mode =3D=3D MAX77759_CHGR_MODE_OTG_BOOST_ON; > +} > + > +static const struct regulator_ops chgin_otg_reg_ops =3D { > + .enable =3D enable_chgin_otg, > + .disable =3D disable_chgin_otg, > + .is_enabled =3D chgin_otg_status, > +}; > + > +static const struct regulator_desc chgin_otg_reg_desc =3D { > + .name =3D "chgin-otg", > + .of_match =3D of_match_ptr("chgin-otg-regulator"), > + .owner =3D THIS_MODULE, > + .ops =3D &chgin_otg_reg_ops, > + .fixed_uV =3D 5000000, > + .n_voltages =3D 1, > +}; > + > +static irqreturn_t irq_handler(int irq, void *data) > +{ > + struct max77759_charger *chg =3D data; > + struct device *dev =3D chg->dev; > + u32 chgint_ok; > + int i; > + > + regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_INT_OK, &chgint_ok); You might want to check the return value and return IRQ_NONE if it didn't work? > + > + for (i =3D 0; i < ARRAY_SIZE(irqs); i++) { > + if (irqs[i] =3D=3D irq) > + break; > + } > + > + switch (i) { > + case AICL: > + dev_dbg(dev, "AICL mode: %s", > + str_no_yes(chgint_ok & MAX77759_CHGR_REG_CHG_INT_AICL)); > + break; > + case CHGIN: > + dev_dbg(dev, "CHGIN input valid: %s", > + str_yes_no(chgint_ok & MAX77759_CHGR_REG_CHG_INT_CHGIN)); > + break; > + case CHG: > + dev_dbg(dev, "CHG status okay/off: %s", > + str_yes_no(chgint_ok & MAX77759_CHGR_REG_CHG_INT_CHG)); > + break; > + case INLIM: > + dev_dbg(dev, "Current Limit reached: %s", > + str_no_yes(chgint_ok & MAX77759_CHGR_REG_CHG_INT_INLIM)); > + break; > + case BAT_OILO: > + dev_dbg(dev, "Battery over-current threshold crossed"); > + break; > + case CHG_STA_CC: > + dev_dbg(dev, "Charger reached CC stage"); > + break; > + case CHG_STA_CV: > + dev_dbg(dev, "Charger reached CV stage"); > + break; > + case CHG_STA_TO: > + dev_dbg(dev, "Charger reached TO stage"); > + break; > + case CHG_STA_DONE: > + dev_dbg(dev, "Charger reached TO stage"); > + break; Are the above debug messages really all needed? > + default: > + dev_err(dev, "Unrecognized irq: %d", i); > + return IRQ_HANDLED; I'm not sure it should return IRQ_HANDLED in this case. > + } > + > + power_supply_changed(chg->psy); > + return IRQ_HANDLED; > +} > + > +static int max77759_init_irqhandler(struct max77759_charger *chg) > +{ > + struct device *dev =3D chg->dev; > + unsigned long irq_flags; > + struct irq_data *irqd; > + int i, ret; > + > + for (i =3D 0; i < ARRAY_SIZE(chgr_irqs_str); i++) { > + ret =3D platform_get_irq_byname(to_platform_device(dev), > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 chgr_irqs_str[i]); > + if (ret < 0) { > + dev_err(dev, > + "Failed to get irq resource for %s, ret=3D%d", > + chgr_irqs_str[i], ret); > + return ret; > + } You should use return dev_err_probe() here, and drop the additional dev_err= _probe() in max77759_charger_probe(). > + > + irqs[i] =3D ret; > + irq_flags =3D IRQF_ONESHOT; > + irqd =3D irq_get_irq_data(irqs[i]); > + if (irqd) > + irq_flags |=3D irqd_get_trigger_type(irqd); The above three lines are not needed, and then you can also drop irq_flags = and use its value in the below call directly. > + > + ret =3D devm_request_threaded_irq(dev, irqs[i], NULL, irq_handler, > + irq_flags, dev_name(dev), chg); > + if (ret) { > + dev_err(dev, > + "Unable to register irq handler for %s, ret=3D%d", > + chgr_irqs_str[i], ret); > + return ret; dev_err_probe() please. > + } > + } > + > + return 0; > +} > + > +static int max77759_charger_init(struct max77759_charger *chg) > +{ > + struct power_supply_battery_info *info; > + u32 regval, fast_chg_curr, fv; > + int ret; > + > + regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00, ®val); > + chg->mode =3D FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_00_MODE, regval); > + ret =3D charger_set_mode(chg, MAX77759_CHGR_MODE_OFF); > + if (ret) > + return ret; > + > + if (power_supply_get_battery_info(chg->psy, &info)) { > + fv =3D CHG_FV_DEFAULT_MV; > + fast_chg_curr =3D CHG_CC_DEFAULT_UA; > + } else { > + fv =3D info->constant_charge_voltage_max_uv / 1000; > + fast_chg_curr =3D info->constant_charge_current_max_ua; > + } > + > + ret =3D set_fast_charge_current_limit(chg, fast_chg_curr); > + if (ret) > + return ret; > + > + ret =3D set_float_voltage_limit(chg, fv); > + if (ret) > + return ret; > + > + ret =3D unlock_prot_regs(chg, true); > + if (ret) > + return ret; > + > + /* Disable wireless charging input */ > + regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_12, > + =C2=A0=C2=A0 MAX77759_CHGR_REG_CHG_CNFG_12_WCINSEL, 0); > + > + regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_18, > + =C2=A0=C2=A0 MAX77759_CHGR_REG_CHG_CNFG_18_WDTEN, 0); I think it's good practice to check return values. > + > + return unlock_prot_regs(chg, false); > +} > + > +static void psy_work_item(struct work_struct *work) > +{ > + struct max77759_charger *chg =3D > + container_of(work, struct max77759_charger, psy_work); > + union power_supply_propval current_limit =3D { 0 }, online =3D { 0 }; > + int ret; > + > + power_supply_get_property(chg->tcpm_psy, POWER_SUPPLY_PROP_CURRENT_MAX, > + =C2=A0 ¤t_limit); > + power_supply_get_property(chg->tcpm_psy, POWER_SUPPLY_PROP_ONLINE, > + =C2=A0 &online); Would it make sense to rework this and check the return values? Then you ca= n also drop the greedy init at function entry. > + > + if (online.intval && current_limit.intval) { > + ret =3D set_input_current_limit(chg, current_limit.intval); > + if (ret) > + dev_err(chg->dev, > + "Unable to set current limit, ret=3D%d", ret); > + > + charger_set_mode(chg, MAX77759_CHGR_MODE_CHG_BUCK_ON); > + } else { > + charger_set_mode(chg, MAX77759_CHGR_MODE_OFF); > + } > +} > + > +static int psy_changed(struct notifier_block *nb, unsigned long evt, voi= d *data) > +{ > + struct max77759_charger *chg =3D container_of(nb, struct max77759_charg= er, > + =C2=A0=C2=A0=C2=A0 nb); > + const char *psy_name =3D "tcpm-source"; > + struct power_supply *psy =3D data; > + > + if (!strnstr(psy->desc->name, psy_name, strlen(psy_name)) || > + =C2=A0=C2=A0=C2=A0 evt !=3D PSY_EVENT_PROP_CHANGED) > + return NOTIFY_OK; > + > + chg->tcpm_psy =3D psy; > + schedule_work(&chg->psy_work); Maybe add a newline here. > + return NOTIFY_OK; > +} > + > +static void max_tcpci_unregister_psy_notifier(void *nb) > +{ > + power_supply_unreg_notifier(nb); > +} > + > +static int max77759_charger_probe(struct platform_device *pdev) > +{ > + struct regulator_config chgin_otg_reg_cfg; > + struct power_supply_config psy_cfg; > + struct device *dev =3D &pdev->dev; > + struct max77759_charger *chg; > + int ret; > + > + device_set_of_node_from_dev(dev, dev->parent); > + chg =3D devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL); > + if (!chg) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, chg); > + chg->dev =3D dev; > + chg->regmap =3D dev_get_regmap(dev->parent, "charger"); > + if (!chg->regmap) > + return dev_err_probe(dev, -ENODEV, "Missing regmap"); > + > + ret =3D devm_mutex_init(dev, &chg->lock); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to initialize lock"); > + > + psy_cfg.fwnode =3D dev_fwnode(dev); > + psy_cfg.drv_data =3D chg; > + chg->psy =3D devm_power_supply_register(dev, &max77759_charger_desc, > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &psy_cfg); > + if (IS_ERR(chg->psy)) > + return dev_err_probe(dev, -EPROBE_DEFER, > + =C2=A0=C2=A0=C2=A0=C2=A0 "Failed to register psy, ret=3D%ld", > + =C2=A0=C2=A0=C2=A0=C2=A0 PTR_ERR(chg->psy)); > + > + ret =3D max77759_charger_init(chg); > + if (ret) > + return dev_err_probe(dev, ret, > + =C2=A0=C2=A0=C2=A0=C2=A0 "Failed to initialize max77759 charger"); > + > + chgin_otg_reg_cfg.dev =3D dev; > + chgin_otg_reg_cfg.driver_data =3D chg; > + chgin_otg_reg_cfg.of_node =3D dev_of_node(dev); > + chg->chgin_otg_rdev =3D devm_regulator_register(dev, &chgin_otg_reg_des= c, > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &chgin_otg_reg_cfg); > + if (IS_ERR(chg->chgin_otg_rdev)) > + return dev_err_probe(dev, PTR_ERR(chg->chgin_otg_rdev), > + =C2=A0=C2=A0=C2=A0=C2=A0 "Failed to register chgin otg regulator"); > + > + ret =3D devm_work_autocancel(dev, &chg->psy_work, psy_work_item); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to initialize psy work"); > + > + chg->nb.notifier_call =3D psy_changed; > + ret =3D power_supply_reg_notifier(&chg->nb); > + if (ret) > + return dev_err_probe(dev, ret, > + =C2=A0=C2=A0=C2=A0=C2=A0 "Unable to register psy notifier"); > + > + ret =3D devm_add_action_or_reset(dev, max_tcpci_unregister_psy_notifier= , > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &chg->nb); > + if (ret) > + return ret; You could print a message here as well. Cheers, Andre'