linux-kernel - Re: [PATCH 3/3] leds: Add ktd2692 flash LED driver

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Date:	Fri, 27 Feb 2015 09:06:45 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Ingi Kim <ingi2.kim@...sung.com>, robh+dt@...ner.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bryan Wu <cooloney@...il.com>, rpurdie@...ys.net,
	treding@...dia.com, Philipp Zabel <p.zabel@...gutronix.de>,
	Andrew Lunn <andrew@...n.ch>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	florian.vaussard@...l.ch, arno@...isbad.org,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Hayato Suzuki <hytszk@...il.com>, antonynpavlov@...il.com
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-leds@...r.kernel.org
Subject: Re: [PATCH 3/3] leds: Add ktd2692 flash LED driver

On 02/27/2015 06:31 AM, Ingi Kim wrote:
> This patch adds a driver to support the ktd2692 flash LEDs.
> ktd2692 can control flash current by ExpressWire interface.
>
> Signed-off-by: Ingi Kim <ingi2.kim@...sung.com>
> ---
>   drivers/leds/Kconfig        |    8 ++
>   drivers/leds/Makefile       |    1 +
>   drivers/leds/leds-ktd2692.c |  245 +++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 254 insertions(+)
>   create mode 100644 drivers/leds/leds-ktd2692.c
>
(...)

> +static struct ktd2692_context *ktd2692_parse_dt(struct device *dev)
> +{
> + struct device_node *np = dev->of_node;
> + struct ktd2692_context *led;
> +
> + led = devm_kzalloc(dev, sizeof(struct ktd2692_context), GFP_KERNEL);
> + if (!led)
> + return ERR_PTR((long)led);

What about using sizeof(*led) in place of sizeof(struct ktd2692_context)..?

Also the error return for devm_kzalloc() should be -ENOMEM.

> +
> + led->strobe_gpio = of_get_named_gpio(np, "strobe-gpio", 0);
> + if (!gpio_is_valid(led->strobe_gpio)) {
> + dev_err(dev, "no strobe_gpio property found\n");
> + return ERR_PTR(led->strobe_gpio);
> + }
> +
> + return led;
> +}
> +
> +static int ktd2692_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct ktd2692_context *led;
> + int ret;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + led = ktd2692_parse_dt(dev);
> + if (IS_ERR(led))
> + return PTR_ERR(led);
> +
> + led->cdev.name = KTD2692_DEFAULT_NAME;
> + led->cdev.brightness = LED_OFF;
> + led->cdev.max_brightness = LED_FULL;
> + led->cdev.flags |= LED_CORE_SUSPENDRESUME;
> + led->cdev.brightness_set = ktd2692_brightness_set;
> + led->cdev.brightness_get = ktd2692_brightness_get;
> + led->mode = KTD2692_REG_MODE_BASE | KTD2692_MODE_DISABLE;
> +
> + platform_set_drvdata(pdev, led);
> +
> + ret = led_classdev_register(&pdev->dev, &led->cdev);
> + if (ret) {
> + dev_err(dev, "couldn't register LED %s\n", led->cdev.name);
> + return ret;
> + }
> +
> + ret = ktd2692_brightness_set_gpio(led);
> + if (ret) {
> + led_classdev_unregister(&led->cdev);
> + return ret;
> + }
> +
> + ktd2692_expresswire_reset(led);
> +
> + return ret;

return 0 instead of ret...?



-- 
Thanks,
Varka Bhadram.
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