panel-lvds.c 6.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Generic LVDS panel driver
  4. *
  5. * Copyright (C) 2016 Laurent Pinchart
  6. * Copyright (C) 2016 Renesas Electronics Corporation
  7. *
  8. * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  9. */
  10. #include <linux/gpio/consumer.h>
  11. #include <linux/module.h>
  12. #include <linux/of_platform.h>
  13. #include <linux/platform_device.h>
  14. #include <linux/regulator/consumer.h>
  15. #include <linux/slab.h>
  16. #include <video/display_timing.h>
  17. #include <video/of_display_timing.h>
  18. #include <video/videomode.h>
  19. #include <drm/drm_crtc.h>
  20. #include <drm/drm_panel.h>
  21. struct panel_lvds {
  22. struct drm_panel panel;
  23. struct device *dev;
  24. const char *label;
  25. unsigned int width;
  26. unsigned int height;
  27. struct videomode video_mode;
  28. unsigned int bus_format;
  29. bool data_mirror;
  30. struct regulator *supply;
  31. struct gpio_desc *enable_gpio;
  32. struct gpio_desc *reset_gpio;
  33. enum drm_panel_orientation orientation;
  34. };
  35. static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
  36. {
  37. return container_of(panel, struct panel_lvds, panel);
  38. }
  39. static int panel_lvds_unprepare(struct drm_panel *panel)
  40. {
  41. struct panel_lvds *lvds = to_panel_lvds(panel);
  42. if (lvds->enable_gpio)
  43. gpiod_set_value_cansleep(lvds->enable_gpio, 0);
  44. if (lvds->supply)
  45. regulator_disable(lvds->supply);
  46. return 0;
  47. }
  48. static int panel_lvds_prepare(struct drm_panel *panel)
  49. {
  50. struct panel_lvds *lvds = to_panel_lvds(panel);
  51. if (lvds->supply) {
  52. int err;
  53. err = regulator_enable(lvds->supply);
  54. if (err < 0) {
  55. dev_err(lvds->dev, "failed to enable supply: %d\n",
  56. err);
  57. return err;
  58. }
  59. }
  60. if (lvds->enable_gpio)
  61. gpiod_set_value_cansleep(lvds->enable_gpio, 1);
  62. return 0;
  63. }
  64. static int panel_lvds_get_modes(struct drm_panel *panel,
  65. struct drm_connector *connector)
  66. {
  67. struct panel_lvds *lvds = to_panel_lvds(panel);
  68. struct drm_display_mode *mode;
  69. mode = drm_mode_create(connector->dev);
  70. if (!mode)
  71. return 0;
  72. drm_display_mode_from_videomode(&lvds->video_mode, mode);
  73. mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  74. drm_mode_probed_add(connector, mode);
  75. connector->display_info.width_mm = lvds->width;
  76. connector->display_info.height_mm = lvds->height;
  77. drm_display_info_set_bus_formats(&connector->display_info,
  78. &lvds->bus_format, 1);
  79. connector->display_info.bus_flags = lvds->data_mirror
  80. ? DRM_BUS_FLAG_DATA_LSB_TO_MSB
  81. : DRM_BUS_FLAG_DATA_MSB_TO_LSB;
  82. drm_connector_set_panel_orientation(connector, lvds->orientation);
  83. return 1;
  84. }
  85. static const struct drm_panel_funcs panel_lvds_funcs = {
  86. .unprepare = panel_lvds_unprepare,
  87. .prepare = panel_lvds_prepare,
  88. .get_modes = panel_lvds_get_modes,
  89. };
  90. static int panel_lvds_parse_dt(struct panel_lvds *lvds)
  91. {
  92. struct device_node *np = lvds->dev->of_node;
  93. struct display_timing timing;
  94. const char *mapping;
  95. int ret;
  96. ret = of_drm_get_panel_orientation(np, &lvds->orientation);
  97. if (ret < 0) {
  98. dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret);
  99. return ret;
  100. }
  101. ret = of_get_display_timing(np, "panel-timing", &timing);
  102. if (ret < 0) {
  103. dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
  104. np, ret);
  105. return ret;
  106. }
  107. videomode_from_timing(&timing, &lvds->video_mode);
  108. ret = of_property_read_u32(np, "width-mm", &lvds->width);
  109. if (ret < 0) {
  110. dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
  111. np, "width-mm");
  112. return -ENODEV;
  113. }
  114. ret = of_property_read_u32(np, "height-mm", &lvds->height);
  115. if (ret < 0) {
  116. dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
  117. np, "height-mm");
  118. return -ENODEV;
  119. }
  120. of_property_read_string(np, "label", &lvds->label);
  121. ret = of_property_read_string(np, "data-mapping", &mapping);
  122. if (ret < 0) {
  123. dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
  124. np, "data-mapping");
  125. return -ENODEV;
  126. }
  127. if (!strcmp(mapping, "jeida-18")) {
  128. lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
  129. } else if (!strcmp(mapping, "jeida-24")) {
  130. lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
  131. } else if (!strcmp(mapping, "vesa-24")) {
  132. lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
  133. } else {
  134. dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
  135. np, "data-mapping");
  136. return -EINVAL;
  137. }
  138. lvds->data_mirror = of_property_read_bool(np, "data-mirror");
  139. return 0;
  140. }
  141. static int panel_lvds_probe(struct platform_device *pdev)
  142. {
  143. struct panel_lvds *lvds;
  144. int ret;
  145. lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
  146. if (!lvds)
  147. return -ENOMEM;
  148. lvds->dev = &pdev->dev;
  149. ret = panel_lvds_parse_dt(lvds);
  150. if (ret < 0)
  151. return ret;
  152. lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
  153. if (IS_ERR(lvds->supply)) {
  154. ret = PTR_ERR(lvds->supply);
  155. if (ret != -ENODEV) {
  156. if (ret != -EPROBE_DEFER)
  157. dev_err(lvds->dev, "failed to request regulator: %d\n",
  158. ret);
  159. return ret;
  160. }
  161. lvds->supply = NULL;
  162. }
  163. /* Get GPIOs and backlight controller. */
  164. lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
  165. GPIOD_OUT_LOW);
  166. if (IS_ERR(lvds->enable_gpio)) {
  167. ret = PTR_ERR(lvds->enable_gpio);
  168. dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
  169. "enable", ret);
  170. return ret;
  171. }
  172. lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
  173. GPIOD_OUT_HIGH);
  174. if (IS_ERR(lvds->reset_gpio)) {
  175. ret = PTR_ERR(lvds->reset_gpio);
  176. dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
  177. "reset", ret);
  178. return ret;
  179. }
  180. /*
  181. * TODO: Handle all power supplies specified in the DT node in a generic
  182. * way for panels that don't care about power supply ordering. LVDS
  183. * panels that require a specific power sequence will need a dedicated
  184. * driver.
  185. */
  186. /* Register the panel. */
  187. drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
  188. DRM_MODE_CONNECTOR_LVDS);
  189. ret = drm_panel_of_backlight(&lvds->panel);
  190. if (ret)
  191. return ret;
  192. drm_panel_add(&lvds->panel);
  193. dev_set_drvdata(lvds->dev, lvds);
  194. return 0;
  195. }
  196. static int panel_lvds_remove(struct platform_device *pdev)
  197. {
  198. struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
  199. drm_panel_remove(&lvds->panel);
  200. drm_panel_disable(&lvds->panel);
  201. return 0;
  202. }
  203. static const struct of_device_id panel_lvds_of_table[] = {
  204. { .compatible = "panel-lvds", },
  205. { /* Sentinel */ },
  206. };
  207. MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
  208. static struct platform_driver panel_lvds_driver = {
  209. .probe = panel_lvds_probe,
  210. .remove = panel_lvds_remove,
  211. .driver = {
  212. .name = "panel-lvds",
  213. .of_match_table = panel_lvds_of_table,
  214. },
  215. };
  216. module_platform_driver(panel_lvds_driver);
  217. MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
  218. MODULE_DESCRIPTION("LVDS Panel Driver");
  219. MODULE_LICENSE("GPL");