Re: [PATCH v3] leds: provide helper to register "leds-gpio" devices

[Uwe Kleine-König]

Hi Richard,

On Mon, Apr 11, 2011 at 10:35:57PM +0200, Uwe Kleine-König wrote:
> This function makes a deep copy of the platform data to allow it to live
> in init memory.
> The definition cannot go into leds-gpio.c because it needs to be builtin
> to be usable by platforms.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
any comment by you?

Best regards
Uwe

> ---
> Hello,
> 
> changes since v2:
>  - define gpio_led_register_device in a new file (led-register.c)
>  - new parameter id for gpio_led_register_device
>  - change drivers/Makefile to unconditionally include
>    drivers/leds/Makefile
> 
> On Wed, Apr 06, 2011 at 06:38:17AM -0700, Richard Purdie wrote:
> > It should only be built-in on platforms that both use leds-gpio and want
> > to use this function at boot time. This is not the description of
> > leds-core.c.
> > 
> > I understand the issue and the desire to move it into common code, I
> > think that is good but I don't think you've found the most appropriate
> > place yet.
> > 
> > I'm tempted to suggest making the function a static inline in leds.h (or
> > create an leds-gpio.h and move the struct definition there too).
> I don't like your static inline suggestion but prefer a "select
> SOMETHING" to make the function available. So what about this patch?
> 
> I choosed a generic name led-register.c, maybe in the future some more
> leds want a similar function.
> 
> Best regards
> Uwe
> 
>  drivers/Makefile            |    2 +-
>  drivers/leds/Kconfig        |    5 +++++
>  drivers/leds/Makefile       |    1 +
>  drivers/leds/led-register.c |   33 +++++++++++++++++++++++++++++++++
>  include/linux/leds.h        |   12 ++++++++++++
>  5 files changed, 52 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/leds/led-register.c
> 
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 3f135b6..4a4f425 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -95,7 +95,7 @@ obj-$(CONFIG_CPU_IDLE)		+= cpuidle/
>  obj-$(CONFIG_DMA_ENGINE)	+= dma/
>  obj-$(CONFIG_MMC)		+= mmc/
>  obj-$(CONFIG_MEMSTICK)		+= memstick/
> -obj-$(CONFIG_NEW_LEDS)		+= leds/
> +obj-y				+= leds/
>  obj-$(CONFIG_INFINIBAND)	+= infiniband/
>  obj-$(CONFIG_SGI_SN)		+= sn/
>  obj-y				+= firmware/
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 9bec869..e8e101e 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -14,6 +14,11 @@ config LEDS_CLASS
>  	  This option enables the led sysfs class in /sys/class/leds.  You'll
>  	  need this to do anything useful with LEDs.  If unsure, say N.
>  
> +config LED_REGISTER_GPIO
> +	bool
> +	help
> +	  This option provides the function gpio_led_register_device.
> +
>  if NEW_LEDS
>  
>  comment "LED drivers"
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 39c80fc..ca428bd 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -3,6 +3,7 @@
>  obj-$(CONFIG_NEW_LEDS)			+= led-core.o
>  obj-$(CONFIG_LEDS_CLASS)		+= led-class.o
>  obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
> +obj-y					+= led-register.o
>  
>  # LED Platform Drivers
>  obj-$(CONFIG_LEDS_88PM860X)		+= leds-88pm860x.o
> diff --git a/drivers/leds/led-register.c b/drivers/leds/led-register.c
> new file mode 100644
> index 0000000..d3731ea
> --- /dev/null
> +++ b/drivers/leds/led-register.c
> @@ -0,0 +1,33 @@
> +/*
> + * Copyright (C) 2011 Pengutronix
> + * Uwe Kleine-Koenig <u.kleine-koenig@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it under
> + * the terms of the GNU General Public License version 2 as published by the
> + * Free Software Foundation.
> + */
> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/leds.h>
> +
> +#if defined(CONFIG_LED_REGISTER_GPIO)
> +struct platform_device *__init gpio_led_register_device(
> +		int id, const struct gpio_led_platform_data *pdata)
> +{
> +	struct platform_device *ret;
> +	struct gpio_led_platform_data _pdata = *pdata;
> +
> +	_pdata.leds = kmemdup(pdata->leds,
> +			pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
> +	if (!_pdata.leds)
> +		return ERR_PTR(-ENOMEM);
> +
> +	ret = platform_device_register_resndata(NULL, "leds-gpio", id,
> +			NULL, 0, &_pdata, sizeof(_pdata));
> +	if (IS_ERR(ret))
> +		kfree(_pdata.leds);
> +
> +	return ret;
> +}
> +#endif
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 61e0340..b20474d 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -207,5 +207,17 @@ struct gpio_led_platform_data {
>  					unsigned long *delay_off);
>  };
>  
> +/**
> + * gpio_led_register_device - register a gpio-led device
> + * @pdata: the platform data used for the new device
> + *
> + * Use this function instead of platform_device_add()ing a static struct
> + * platform_device.
> + *
> + * Note: as pdata and pdata->leds is copied these usually can and should be
> + * __initdata.
> + */
> +struct platform_device *gpio_led_register_device(
> +		int id, const struct gpio_led_platform_data *pdata);
>  
>  #endif		/* __LINUX_LEDS_H_INCLUDED */
> -- 
> 1.7.2.3
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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