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Wed, 14 Oct 2026 18:38:31 -0700 (PDT) Date: Wed, 14 Oct 2026 18:38:30 -0700 Message-ID: From: Dmitry Torokhov To: Svyatoslav Ryhel Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lee Jones , Pavel Machek , Sebastian Reichel , Ion Agorria , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Florian Krischer , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, mfd@lists.linux.dev, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: Re: [PATCH v11 6/7] power: supply: Add driver for ASUS Transformer battery In-Reply-To: <20261013173504.451391-7-clamor95@gmail.com> References: <20261013173504.451391-1-clamor95@gmail.com> <20261013173504.451391-7-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi Svyatoslav, On Tue, Oct 13, 2026 at 08:35:02PM +0300, Svyatoslav Ryhel wrote: > +static int asus_ec_battery_get_property(struct power_supply *psy, > + enum power_supply_property psp, > + union power_supply_propval *val) > +{ > + struct asus_ec_battery_data *priv = power_supply_get_drvdata(psy); > + int ret; > + > + switch (psp) { > + case POWER_SUPPLY_PROP_PRESENT: > + val->intval = 1; > + break; > + > + default: > + ret = asus_ec_battery_get_value(priv, psp); > + if (ret < 0) > + return ret; > + > + val->intval = (s16)ret; > + > + switch (psp) { ... > + case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: > + case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: > + val->intval *= 60; > + break; asus_ec_battery_get_value() returns a u16 (via get_unaligned_le16()), and unconditionally casting it with (s16)ret sign-extends unsigned 16-bit properties >= 0x8000 into negative values. In particular, when the battery is not discharging or not charging, TIME_TO_EMPTY_NOW / TIME_TO_FULL_NOW report 0xffff, which (s16)ret turns into -1 and then -60 seconds instead of an unsigned value (or -ENODATA). Should only signed properties (like POWER_SUPPLY_PROP_CURRENT_NOW) be cast to s16? Thanks. -- Dmitry