drivers/leds/leds-gpio-register.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Pengutronix
   4  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
   5  */
   6 #include <linux/err.h>
   7 #include <linux/leds.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/slab.h>
  10
  11 /**
  12  * gpio_led_register_device - register a gpio-led device
  13  * @pdata: the platform data used for the new device
  14  *
  15  * Makes a copy of pdata and pdata->leds and registers a new leds-gpio device
  16  * with the result. This allows to have pdata and pdata-leds in .init.rodata
  17  * and so saves some bytes compared to a static struct platform_device with
  18  * static platform data.
  19  *
  20  * Returns the registered device or an error pointer.
  21  */
  22 struct platform_device *__init gpio_led_register_device(
  23                 int id, const struct gpio_led_platform_data *pdata)
  24 {
  25         struct platform_device *ret;
  26         struct gpio_led_platform_data _pdata = *pdata;
  27
  28         if (!pdata->num_leds)
  29                 return ERR_PTR(-EINVAL);
  30
  31         _pdata.leds = kmemdup(pdata->leds,
  32                         pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
  33         if (!_pdata.leds)
  34                 return ERR_PTR(-ENOMEM);
  35
  36         ret = platform_device_register_resndata(NULL, "leds-gpio", id,
  37                         NULL, 0, &_pdata, sizeof(_pdata));
  38         if (IS_ERR(ret))
  39                 kfree(_pdata.leds);
  40
  41         return ret;
  42 }