lvds-codec.c 4.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (C) 2019 Renesas Electronics Corporation
  4. * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  5. */
  6. #include <linux/gpio/consumer.h>
  7. #include <linux/module.h>
  8. #include <linux/of.h>
  9. #include <linux/of_device.h>
  10. #include <linux/of_graph.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/regulator/consumer.h>
  13. #include <drm/drm_bridge.h>
  14. #include <drm/drm_panel.h>
  15. struct lvds_codec {
  16. struct device *dev;
  17. struct drm_bridge bridge;
  18. struct drm_bridge *panel_bridge;
  19. struct regulator *vcc;
  20. struct gpio_desc *powerdown_gpio;
  21. u32 connector_type;
  22. };
  23. static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge)
  24. {
  25. return container_of(bridge, struct lvds_codec, bridge);
  26. }
  27. static int lvds_codec_attach(struct drm_bridge *bridge,
  28. enum drm_bridge_attach_flags flags)
  29. {
  30. struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
  31. return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge,
  32. bridge, flags);
  33. }
  34. static void lvds_codec_enable(struct drm_bridge *bridge)
  35. {
  36. struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
  37. int ret;
  38. ret = regulator_enable(lvds_codec->vcc);
  39. if (ret) {
  40. dev_err(lvds_codec->dev,
  41. "Failed to enable regulator \"vcc\": %d\n", ret);
  42. return;
  43. }
  44. if (lvds_codec->powerdown_gpio)
  45. gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
  46. }
  47. static void lvds_codec_disable(struct drm_bridge *bridge)
  48. {
  49. struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
  50. int ret;
  51. if (lvds_codec->powerdown_gpio)
  52. gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
  53. ret = regulator_disable(lvds_codec->vcc);
  54. if (ret)
  55. dev_err(lvds_codec->dev,
  56. "Failed to disable regulator \"vcc\": %d\n", ret);
  57. }
  58. static const struct drm_bridge_funcs funcs = {
  59. .attach = lvds_codec_attach,
  60. .enable = lvds_codec_enable,
  61. .disable = lvds_codec_disable,
  62. };
  63. static int lvds_codec_probe(struct platform_device *pdev)
  64. {
  65. struct device *dev = &pdev->dev;
  66. struct device_node *panel_node;
  67. struct drm_panel *panel;
  68. struct lvds_codec *lvds_codec;
  69. int ret;
  70. lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
  71. if (!lvds_codec)
  72. return -ENOMEM;
  73. lvds_codec->dev = &pdev->dev;
  74. lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
  75. lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "power");
  76. if (IS_ERR(lvds_codec->vcc)) {
  77. ret = PTR_ERR(lvds_codec->vcc);
  78. if (ret != -EPROBE_DEFER)
  79. dev_err(lvds_codec->dev,
  80. "Unable to get \"vcc\" supply: %d\n", ret);
  81. return ret;
  82. }
  83. lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
  84. GPIOD_OUT_HIGH);
  85. if (IS_ERR(lvds_codec->powerdown_gpio))
  86. return dev_err_probe(dev, PTR_ERR(lvds_codec->powerdown_gpio),
  87. "powerdown GPIO failure\n");
  88. /* Locate the panel DT node. */
  89. panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);
  90. if (!panel_node) {
  91. dev_dbg(dev, "panel DT node not found\n");
  92. return -ENXIO;
  93. }
  94. panel = of_drm_find_panel(panel_node);
  95. of_node_put(panel_node);
  96. if (IS_ERR(panel)) {
  97. dev_dbg(dev, "panel not found, deferring probe\n");
  98. return PTR_ERR(panel);
  99. }
  100. lvds_codec->panel_bridge =
  101. devm_drm_panel_bridge_add_typed(dev, panel,
  102. lvds_codec->connector_type);
  103. if (IS_ERR(lvds_codec->panel_bridge))
  104. return PTR_ERR(lvds_codec->panel_bridge);
  105. /*
  106. * The panel_bridge bridge is attached to the panel's of_node,
  107. * but we need a bridge attached to our of_node for our user
  108. * to look up.
  109. */
  110. lvds_codec->bridge.of_node = dev->of_node;
  111. lvds_codec->bridge.funcs = &funcs;
  112. drm_bridge_add(&lvds_codec->bridge);
  113. platform_set_drvdata(pdev, lvds_codec);
  114. return 0;
  115. }
  116. static int lvds_codec_remove(struct platform_device *pdev)
  117. {
  118. struct lvds_codec *lvds_codec = platform_get_drvdata(pdev);
  119. drm_bridge_remove(&lvds_codec->bridge);
  120. return 0;
  121. }
  122. static const struct of_device_id lvds_codec_match[] = {
  123. {
  124. .compatible = "lvds-decoder",
  125. .data = (void *)DRM_MODE_CONNECTOR_DPI,
  126. },
  127. {
  128. .compatible = "lvds-encoder",
  129. .data = (void *)DRM_MODE_CONNECTOR_LVDS,
  130. },
  131. {
  132. .compatible = "thine,thc63lvdm83d",
  133. .data = (void *)DRM_MODE_CONNECTOR_LVDS,
  134. },
  135. {},
  136. };
  137. MODULE_DEVICE_TABLE(of, lvds_codec_match);
  138. static struct platform_driver lvds_codec_driver = {
  139. .probe = lvds_codec_probe,
  140. .remove = lvds_codec_remove,
  141. .driver = {
  142. .name = "lvds-codec",
  143. .of_match_table = lvds_codec_match,
  144. },
  145. };
  146. module_platform_driver(lvds_codec_driver);
  147. MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
  148. MODULE_DESCRIPTION("LVDS encoders and decoders");
  149. MODULE_LICENSE("GPL");