linux-kernel - Re: [PATCH v3 4/6] power: supply: lenovo_yoga_c630

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Date: Tue, 28 May 2024 10:42:58 +0200
From: Oliver Neukum <oneukum@...e.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Oliver Neukum <oneukum@...e.com>
Cc: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 platform-driver-x86@...r.kernel.org, linux-usb@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH v3 4/6] power: supply: lenovo_yoga_c630_battery: add
 Lenovo C630 driver

On 28.05.24 01:15, Dmitry Baryshkov wrote:
> On Mon, May 27, 2024 at 02:26:36PM +0200, Oliver Neukum wrote:
>> On 27.05.24 12:03, Dmitry Baryshkov wrote:

Hi,

>>> +struct yoga_c630_psy {
>>> +	struct yoga_c630_ec *ec;
>>> +	struct device *dev;
>>> +	struct device_node *of_node;
>>> +	struct notifier_block nb;
>>> +	struct mutex lock;
>>> +
>>> +	struct power_supply *adp_psy;
>>> +	struct power_supply *bat_psy;
>>> +
>>> +	unsigned long last_status_update;
>>> +
>>> +	bool adapter_online;
>>> +
>>> +	bool unit_mA;
>>> +
>>> +	unsigned int scale;
>>
>> why do you store unit_mA and scale? This looks redundant and like a source
>> of confusion to me.
> 
> Here we just followed the AML code in ACPI tables. The unit_mA is a
> returned from the_BIX method, the 'scale' is used internally in the DSDT.
> If you think that it's better, I can change all '* scale * 1000' to
> 'if unit_mA then foo = bar * 10000 else foo = bar * 1000'.

I think that would indeed be better. Implementation details of the DSDT
should not dictate data structures in a kernel driver.

	Regards
		Oliver