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 <log.h>
  10. #include <asm/gpio.h>
  11. struct gpio_backlight_priv {
  12. struct gpio_desc gpio;
  13. bool def_value;
  14. };
  15. static int gpio_backlight_enable(struct udevice *dev)
  16. {
  17. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  18. dm_gpio_set_value(&priv->gpio, 1);
  19. return 0;
  20. }
  21. static int gpio_backlight_ofdata_to_platdata(struct udevice *dev)
  22. {
  23. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  24. int ret;
  25. ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio,
  26. GPIOD_IS_OUT);
  27. if (ret) {
  28. debug("%s: Warning: cannot get GPIO: ret=%d\n",
  29. __func__, ret);
  30. return ret;
  31. }
  32. priv->def_value = dev_read_bool(dev, "default-on");
  33. return 0;
  34. }
  35. static int gpio_backlight_probe(struct udevice *dev)
  36. {
  37. struct gpio_backlight_priv *priv = dev_get_priv(dev);
  38. if (priv->def_value)
  39. gpio_backlight_enable(dev);
  40. return 0;
  41. }
  42. static const struct backlight_ops gpio_backlight_ops = {
  43. .enable = gpio_backlight_enable,
  44. };
  45. static const struct udevice_id gpio_backlight_ids[] = {
  46. { .compatible = "gpio-backlight" },
  47. { }
  48. };
  49. U_BOOT_DRIVER(gpio_backlight) = {
  50. .name = "gpio_backlight",
  51. .id = UCLASS_PANEL_BACKLIGHT,
  52. .of_match = gpio_backlight_ids,
  53. .ops = &gpio_backlight_ops,
  54. .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata,
  55. .probe = gpio_backlight_probe,
  56. .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv),
  57. };