drivers/button/button-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
   4  *
   5  * Based on led-uclass.c
   6  */
   7
   8 #define LOG_CATEGORY UCLASS_BUTTON
   9
  10 #include <common.h>
  11 #include <button.h>
  12 #include <dm.h>
  13 #include <dm/uclass-internal.h>
  14
  15 int button_get_by_label(const char *label, struct udevice **devp)
  16 {
  17         struct udevice *dev;
  18         struct uclass *uc;
  19
  20         uclass_id_foreach_dev(UCLASS_BUTTON, dev, uc) {
  21                 struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev);
  22
  23                 /* Ignore the top-level button node */
  24                 if (uc_plat->label && !strcmp(label, uc_plat->label))
  25                         return uclass_get_device_tail(dev, 0, devp);
  26         }
  27
  28         return -ENODEV;
  29 }
  30
  31 enum button_state_t button_get_state(struct udevice *dev)
  32 {
  33         struct button_ops *ops = button_get_ops(dev);
  34
  35         if (!ops->get_state)
  36                 return -ENOSYS;
  37
  38         return ops->get_state(dev);
  39 }
  40
  41 UCLASS_DRIVER(button) = {
  42         .id             = UCLASS_BUTTON,
  43         .name           = "button",
  44         .per_device_plat_auto   = sizeof(struct button_uc_plat),
  45 };