drivers/leds/leds-gpio-register.c

   1 /*
   2  * Copyright (C) 2011 Pengutronix
   3  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License version 2 as published by the
   7  * Free Software Foundation.
   8  */
   9 #include <linux/err.h>
  10 #include <linux/leds.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13
  14 /**
  15  * gpio_led_register_device - register a gpio-led device
  16  * @pdata: the platform data used for the new device
  17  *
  18  * Makes a copy of pdata and pdata->leds and registers a new leds-gpio device
  19  * with the result. This allows to have pdata and pdata-leds in .init.rodata
  20  * and so saves some bytes compared to a static struct platform_device with
  21  * static platform data.
  22  *
  23  * Returns the registered device or an error pointer.
  24  */
  25 struct platform_device *__init gpio_led_register_device(
  26                 int id, const struct gpio_led_platform_data *pdata)
  27 {
  28         struct platform_device *ret;
  29         struct gpio_led_platform_data _pdata = *pdata;
  30
  31         if (!pdata->num_leds)
  32                 return ERR_PTR(-EINVAL);
  33
  34         _pdata.leds = kmemdup(pdata->leds,
  35                         pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
  36         if (!_pdata.leds)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         ret = platform_device_register_resndata(NULL, "leds-gpio", id,
  40                         NULL, 0, &_pdata, sizeof(_pdata));
  41         if (IS_ERR(ret))
  42                 kfree(_pdata.leds);
  43
  44         return ret;
  45 }