4440673a95
This function makes a deep copy of the platform data to allow it to live in init memory. For a kernel that supports several machines and so includes the definition for several leds-gpio devices this saves quite some memory because all but one definition can be free'd after boot. As the function is used by arch code it must be builtin and so cannot go into leds-gpio.c. [akpm@linux-foundation.org: s/CONFIG_LED_REGISTER_GPIO/CONFIG_LEDS_REGISTER_GPIO/] Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <rmk@arm.linux.org.uk> Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Tested-by: H Hartley Sweeten <hartleys@visionengravers.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/*
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* Copyright (C) 2011 Pengutronix
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* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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/**
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* gpio_led_register_device - register a gpio-led device
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* @pdata: the platform data used for the new device
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*
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* Makes a copy of pdata and pdata->leds and registers a new leds-gpio device
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* with the result. This allows to have pdata and pdata-leds in .init.rodata
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* and so saves some bytes compared to a static struct platform_device with
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* static platform data.
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*
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* Returns the registered device or an error pointer.
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*/
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struct platform_device *__init gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata)
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{
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struct platform_device *ret;
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struct gpio_led_platform_data _pdata = *pdata;
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_pdata.leds = kmemdup(pdata->leds,
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pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
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if (!_pdata.leds)
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return ERR_PTR(-ENOMEM);
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ret = platform_device_register_resndata(NULL, "leds-gpio", id,
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NULL, 0, &_pdata, sizeof(_pdata));
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if (IS_ERR(ret))
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kfree(_pdata.leds);
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return ret;
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}
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