shmob_drm_backlight.c 2.5 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586
  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * shmob_drm_backlight.c -- SH Mobile DRM Backlight
  4. *
  5. * Copyright (C) 2012 Renesas Electronics Corporation
  6. *
  7. * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  8. */
  9. #include <linux/backlight.h>
  10. #include "shmob_drm_backlight.h"
  11. #include "shmob_drm_crtc.h"
  12. #include "shmob_drm_drv.h"
  13. static int shmob_drm_backlight_update(struct backlight_device *bdev)
  14. {
  15. struct shmob_drm_connector *scon = bl_get_data(bdev);
  16. struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  17. const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  18. int brightness = bdev->props.brightness;
  19. if (bdev->props.power != FB_BLANK_UNBLANK ||
  20. bdev->props.state & BL_CORE_SUSPENDED)
  21. brightness = 0;
  22. return bdata->set_brightness(brightness);
  23. }
  24. static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
  25. {
  26. struct shmob_drm_connector *scon = bl_get_data(bdev);
  27. struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  28. const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  29. return bdata->get_brightness();
  30. }
  31. static const struct backlight_ops shmob_drm_backlight_ops = {
  32. .options = BL_CORE_SUSPENDRESUME,
  33. .update_status = shmob_drm_backlight_update,
  34. .get_brightness = shmob_drm_backlight_get_brightness,
  35. };
  36. void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
  37. {
  38. if (scon->backlight == NULL)
  39. return;
  40. scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
  41. ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  42. backlight_update_status(scon->backlight);
  43. }
  44. int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
  45. {
  46. struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
  47. const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
  48. struct drm_connector *connector = &scon->connector;
  49. struct drm_device *dev = connector->dev;
  50. struct backlight_device *backlight;
  51. if (!bdata->max_brightness)
  52. return 0;
  53. backlight = backlight_device_register(bdata->name, dev->dev, scon,
  54. &shmob_drm_backlight_ops, NULL);
  55. if (IS_ERR(backlight)) {
  56. dev_err(dev->dev, "unable to register backlight device: %ld\n",
  57. PTR_ERR(backlight));
  58. return PTR_ERR(backlight);
  59. }
  60. backlight->props.max_brightness = bdata->max_brightness;
  61. backlight->props.brightness = bdata->max_brightness;
  62. backlight->props.power = FB_BLANK_POWERDOWN;
  63. backlight_update_status(backlight);
  64. scon->backlight = backlight;
  65. return 0;
  66. }
  67. void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
  68. {
  69. backlight_device_unregister(scon->backlight);
  70. }