From: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: <pavel@ucw.cz>, <robh+dt@kernel.org>,
<sven.schwermer@disruptive-technologies.com>,
<krzysztof.kozlowski+dt@linaro.org>, <johan+linaro@kernel.org>,
<marijn.suijten@somainline.org>, <bjorn.andersson@linaro.org>,
<linux-leds@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <sha@pengutronix.de>
Subject: Re: [RESEND PATCH v3 4/4] leds: Add a multicolor LED driver to group monochromatic LEDs
Date: Fri, 7 Oct 2022 08:34:23 +0200 [thread overview]
Message-ID: <6d3d2dfd-4d44-c91a-2145-bae624926259@traphandler.com> (raw)
In-Reply-To: <CAHp75VeAnJQt7kS8UE+OKcqnScYnmHnVvL+QNW6jR=yF0=oMAA@mail.gmail.com>
On 17/09/2022 10:37, Andy Shevchenko wrote:
> On Sat, Sep 17, 2022 at 11:14 AM Jean-Jacques Hiblot
> <jjhiblot@traphandler.com> wrote:
>> By allowing to group multiple monochrome LED into multicolor LEDs,
>> all involved LEDs can be controlled in-sync. This enables using effects
>> using triggers, etc.
> ...
>
>> +config LEDS_GRP_MULTICOLOR
>> + tristate "Multi-color LED grouping support"
>> + help
>> + This option enables support for monochrome LEDs that are
>> + grouped into multicolor LEDs.
> What will be the module name in case of "m" choice?
>
> ...
>
>> + struct led_mcg_priv *priv =
>> + container_of(mc_cdev, struct led_mcg_priv, mc_cdev);
> One line?
>
> ...
>
>> + /*
>> + * Scale the intensity according the max brightness of the
>> + * monochromatic LED
> Usually we put a grammar period at the end of sentences in multi-line comments.
>
>> + */
> ...
>
>> + actual_led_brightness = DIV_ROUND_CLOSEST(
>> + mono->max_brightness * mc_cdev->subled_info[i].brightness,
>> + mc_cdev->led_cdev.max_brightness);
> Can you fix an indentation, so it won't leave the line ending by open
> parenthesis? I believe with the help of a temporary variable it can be
> easily achieved.
Could be done but I have no good name for the variable and I think it
would just make things harder to understand. In that form I think it is
clear that this is a cross-multiplication.
>
> ...
>
>> + for (;;) {
>> + struct led_classdev *led_cdev;
>> + led_cdev = devm_of_led_get(dev, count);
> Why _of_ variant? Please, make this OF independent since it's
> pretending to cover not only OF-based systems.
This is not OF independent. It could be, but that will wait until
someone needs it. I don't know much about ACPI and have no hardware to
test it on.
I'll add the missing dependency on OF in the Kconfig.
>
>
>> + if (IS_ERR(led_cdev)) {
>> + /* Reached the end of the list ? */
>> + if (PTR_ERR(led_cdev) == -ENOENT)
>> + break;
> Looks like the above needs an _optional() variant
>
>> + return dev_err_probe(dev, PTR_ERR(led_cdev),
>> + "Unable to get led #%d", count);
>> + }
> ...
>
>> + priv->monochromatics = devm_krealloc(dev, priv->monochromatics,
>> + count * sizeof(*priv->monochromatics),
>> + GFP_KERNEL);
> This needs at minimum to use one of the helpers from overflow.h,
> ideally you may implement devm_krealloc_array() as a suitable wrapper
> for that.
>
>> + if (!priv->monochromatics)
>> + return -ENOMEM;
> ...
>
>> + subled = devm_kzalloc(dev, count * sizeof(*subled), GFP_KERNEL);
> NIH devm_kcalloc()
>
>> + if (!subled)
>> + return -ENOMEM;
> --
> With Best Regards,
> Andy Shevchenko
next prev parent reply other threads:[~2022-10-07 6:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-17 8:13 [RESEND PATCH v3 0/4] Add a multicolor LED driver for groups of monochromatic LEDs Jean-Jacques Hiblot
2022-09-17 8:13 ` [RESEND PATCH v3 1/4] leds: class: simplify the implementation of devm_of_led_get() Jean-Jacques Hiblot
2022-09-17 8:23 ` Andy Shevchenko
2022-09-17 8:13 ` [RESEND PATCH v3 2/4] leds: class: store the color index in struct led_classdev Jean-Jacques Hiblot
2022-09-17 8:40 ` Andy Shevchenko
2022-10-07 6:29 ` Jean-Jacques Hiblot
2022-09-18 11:25 ` Jacek Anaszewski
2022-09-18 13:19 ` Jacek Anaszewski
2022-09-17 8:13 ` [RESEND PATCH v3 3/4] dt-bindings: leds: Add binding for a multicolor group of LEDs Jean-Jacques Hiblot
2022-09-17 8:13 ` [RESEND PATCH v3 4/4] leds: Add a multicolor LED driver to group monochromatic LEDs Jean-Jacques Hiblot
2022-09-17 8:37 ` Andy Shevchenko
2022-10-07 6:34 ` Jean-Jacques Hiblot [this message]
2022-10-07 8:53 ` Andy Shevchenko
2022-10-07 12:03 ` Jean-Jacques Hiblot
2022-10-07 13:14 ` Andy Shevchenko
2022-09-18 14:54 ` Jacek Anaszewski
2022-10-07 6:46 ` Jean-Jacques Hiblot
2022-09-17 8:25 ` [RESEND PATCH v3 0/4] Add a multicolor LED driver for groups of " Andy Shevchenko
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