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Subject: Re: [PATCH v5] leds: add SGI IP30 led support
To:     Thomas Bogendoerfer <tbogendoerfer@suse.de>,
        Pavel Machek <pavel@ucw.cz>
Cc:     Dan Murphy <dmurphy@ti.com>, linux-kernel@vger.kernel.org,
        linux-leds@vger.kernel.org
References: <20200224111733.10320-1-tbogendoerfer@suse.de>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
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Message-ID: <0a3146ff-95c5-9f57-7c7c-0abbf13e2da4@gmail.com>
Date:   Mon, 24 Feb 2020 20:17:01 +0100
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Hi Thomas,

Thank you for the update.

On 2/24/20 12:17 PM, Thomas Bogendoerfer wrote:
> This patch implemenets a driver to support the front panel LEDs of
> SGI Octane (IP30) workstations.
> 
> Reviewed-by: Dan Murphy <dmurphy@ti.com>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
> ---
> Changes in v5:
>   - use defines for led enumaration
>   - name red led fault and white led system
> 
> Changes in v4:
>   - simplified ip30led_set by using gated value from led framework
> 
> Changes in v3:
>   - rebased to 5.6-rc2
> 
> Changes in v2:
>   - use led names conforming to include/dt-bindings/leds/common.h
>   - read LED state from firmware
>   - leave setting up to user
> 
>  drivers/leds/Kconfig     | 11 +++++
>  drivers/leds/Makefile    |  1 +
>  drivers/leds/leds-ip30.c | 86 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 98 insertions(+)
>  create mode 100644 drivers/leds/leds-ip30.c
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index d82f1dea3711..c664d84e1667 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -846,6 +846,17 @@ config LEDS_TPS6105X
>  	  It is a single boost converter primarily for white LEDs and
>  	  audio amplifiers.
>  
> +config LEDS_IP30
> +	tristate "LED support for SGI Octane machines"
> +	depends on LEDS_CLASS
> +	depends on SGI_MFD_IOC3
> +	help
> +	  This option enables support for the Red and White LEDs of
> +	  SGI Octane machines.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called leds-ip30.
> +
>  comment "LED Triggers"
>  source "drivers/leds/trigger/Kconfig"
>  
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index d7e1107753fb..46bd611a03a9 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -86,6 +86,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
>  obj-$(CONFIG_LEDS_LM3697)		+= leds-lm3697.o
>  obj-$(CONFIG_LEDS_LM36274)		+= leds-lm36274.o
>  obj-$(CONFIG_LEDS_TPS6105X)		+= leds-tps6105x.o
> +obj-$(CONFIG_LEDS_IP30)			+= leds-ip30.o
>  
>  # LED SPI Drivers
>  obj-$(CONFIG_LEDS_CR0014114)		+= leds-cr0014114.o
> diff --git a/drivers/leds/leds-ip30.c b/drivers/leds/leds-ip30.c
> new file mode 100644
> index 000000000000..e95ea786a43e
> --- /dev/null
> +++ b/drivers/leds/leds-ip30.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * LED Driver for SGI Octane machines
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/leds.h>
> +
> +#define IP30_LED_SYSTEM	0
> +#define IP30_LED_FAULT	1
> +
> +struct ip30_led {
> +	struct led_classdev cdev;
> +	u32 __iomem *reg;
> +};
> +
> +static void ip30led_set(struct led_classdev *led_cdev,
> +			enum led_brightness value)
> +{
> +	struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);
> +
> +	writel(value, led->reg);
> +}
> +
> +static int ip30led_create(struct platform_device *pdev, int num)
> +{
> +	struct resource *res;
> +	struct ip30_led *data;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, num);
> +	if (!res)
> +		return -EBUSY;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->reg = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(data->reg))
> +		return PTR_ERR(data->reg);
> +
> +
> +	switch (num) {
> +	case IP30_LED_SYSTEM:
> +		data->cdev.name = "white:system";
> +		break;
> +	case IP30_LED_FAULT:
> +		data->cdev.name = "red:fault";
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	data->cdev.brightness = readl(data->reg);
> +	data->cdev.max_brightness = 1;
> +	data->cdev.brightness_set = ip30led_set;
> +
> +	return devm_led_classdev_register(&pdev->dev, &data->cdev);
> +}
> +
> +static int ip30led_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +
> +	ret = ip30led_create(pdev, IP30_LED_SYSTEM);
> +	if (ret < 0)
> +		return ret;
> +
> +	return ip30led_create(pdev, IP30_LED_FAULT);
> +}
> +
> +static struct platform_driver ip30led_driver = {
> +	.probe		= ip30led_probe,
> +	.driver		= {
> +		.name		= "ip30-leds",
> +	},
> +};
> +
> +module_platform_driver(ip30led_driver);
> +
> +MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
> +MODULE_DESCRIPTION("SGI Octane LED driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:ip30-leds");

Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

-- 
Best regards,
Jacek Anaszewski