backlight_gpio.c 1.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
  4. * Author: Patrick Delaunay <patrick.delaunay@st.com>
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <backlight.h>
  9. #include <asm/gpio.h>
  10. struct gpio_backlight_priv {
  11. struct gpio_desc gpio;
  12. bool def_value;
  13. };
  14. static int gpio_backlight_enable(struct udevice *dev)
  15. {
  16. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  17. dm_gpio_set_value(&priv->gpio, 1);
  18. return 0;
  19. }
  20. static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
  21. {
  22. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  23. int ret;
  24. ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
  25. GPIOD_IS_OUT);
  26. if (ret) {
  27. debug("%s: Warning: cannot get GPIO: ret=%d\n",
  28. __func__, ret);
  29. return ret;
  30. }
  31. priv->def_value = dev_read_bool(dev, "default-on");
  32. return 0;
  33. }
  34. static int gpio_backlight_probe(struct udevice *dev)
  35. {
  36. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  37. if (priv->def_value)
  38. gpio_backlight_enable(dev);
  39. return 0;
  40. }
  41. static const struct backlight_ops gpio_backlight_ops = {
  42. .enable = gpio_backlight_enable,
  43. };
  44. static const struct udevice_id gpio_backlight_ids[] = {
  45. { .compatible = "gpio-backlight" },
  46. { }
  47. };
  48. U_BOOT_DRIVER(gpio_backlight) = {
  49. .name = "gpio_backlight",
  50. .id = UCLASS_PANEL_BACKLIGHT,
  51. .of_match = gpio_backlight_ids,
  52. .ops = &gpio_backlight_ops,
  53. .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
  54. .probe = gpio_backlight_probe,
  55. .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
  56. };