panel-nec-nl8048hl11.c 6.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * NEC NL8048HL11 Panel Driver
  4. *
  5. * Copyright (C) 2019 Texas Instruments Incorporated
  6. *
  7. * Based on the omapdrm-specific panel-nec-nl8048hl11 driver
  8. *
  9. * Copyright (C) 2010 Texas Instruments Incorporated
  10. * Author: Erik Gilling <konkers@android.com>
  11. */
  12. #include <linux/delay.h>
  13. #include <linux/gpio/consumer.h>
  14. #include <linux/module.h>
  15. #include <linux/pm.h>
  16. #include <linux/spi/spi.h>
  17. #include <drm/drm_connector.h>
  18. #include <drm/drm_modes.h>
  19. #include <drm/drm_panel.h>
  20. struct nl8048_panel {
  21. struct drm_panel panel;
  22. struct spi_device *spi;
  23. struct gpio_desc *reset_gpio;
  24. };
  25. #define to_nl8048_device(p) container_of(p, struct nl8048_panel, panel)
  26. static int nl8048_write(struct nl8048_panel *lcd, unsigned char addr,
  27. unsigned char value)
  28. {
  29. u8 data[4] = { value, 0x01, addr, 0x00 };
  30. int ret;
  31. ret = spi_write(lcd->spi, data, sizeof(data));
  32. if (ret)
  33. dev_err(&lcd->spi->dev, "SPI write to %u failed: %d\n",
  34. addr, ret);
  35. return ret;
  36. }
  37. static int nl8048_init(struct nl8048_panel *lcd)
  38. {
  39. static const struct {
  40. unsigned char addr;
  41. unsigned char data;
  42. } nl8048_init_seq[] = {
  43. { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 },
  44. { 5, 0x14 }, { 6, 0x24 }, { 16, 0xd7 }, { 17, 0x00 },
  45. { 18, 0x00 }, { 19, 0x55 }, { 20, 0x01 }, { 21, 0x70 },
  46. { 22, 0x1e }, { 23, 0x25 }, { 24, 0x25 }, { 25, 0x02 },
  47. { 26, 0x02 }, { 27, 0xa0 }, { 32, 0x2f }, { 33, 0x0f },
  48. { 34, 0x0f }, { 35, 0x0f }, { 36, 0x0f }, { 37, 0x0f },
  49. { 38, 0x0f }, { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 },
  50. { 42, 0x02 }, { 43, 0x0f }, { 44, 0x0f }, { 45, 0x0f },
  51. { 46, 0x0f }, { 47, 0x0f }, { 48, 0x0f }, { 49, 0x0f },
  52. { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
  53. { 80, 0x0c }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },
  54. { 86, 0x14 }, { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 },
  55. { 92, 0x02 }, { 93, 0x0c }, { 94, 0x1c }, { 95, 0x27 },
  56. { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 }, { 103, 0x27 },
  57. { 112, 0x01 }, { 113, 0x0e }, { 114, 0x02 }, { 115, 0x0c },
  58. { 118, 0x0c }, { 121, 0x30 }, { 130, 0x00 }, { 131, 0x00 },
  59. { 132, 0xfc }, { 134, 0x00 }, { 136, 0x00 }, { 138, 0x00 },
  60. { 139, 0x00 }, { 140, 0x00 }, { 141, 0xfc }, { 143, 0x00 },
  61. { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 }, { 149, 0x00 },
  62. { 150, 0xfc }, { 152, 0x00 }, { 154, 0x00 }, { 156, 0x00 },
  63. { 157, 0x00 },
  64. };
  65. unsigned int i;
  66. int ret;
  67. for (i = 0; i < ARRAY_SIZE(nl8048_init_seq); ++i) {
  68. ret = nl8048_write(lcd, nl8048_init_seq[i].addr,
  69. nl8048_init_seq[i].data);
  70. if (ret < 0)
  71. return ret;
  72. }
  73. udelay(20);
  74. return nl8048_write(lcd, 2, 0x00);
  75. }
  76. static int nl8048_disable(struct drm_panel *panel)
  77. {
  78. struct nl8048_panel *lcd = to_nl8048_device(panel);
  79. gpiod_set_value_cansleep(lcd->reset_gpio, 0);
  80. return 0;
  81. }
  82. static int nl8048_enable(struct drm_panel *panel)
  83. {
  84. struct nl8048_panel *lcd = to_nl8048_device(panel);
  85. gpiod_set_value_cansleep(lcd->reset_gpio, 1);
  86. return 0;
  87. }
  88. static const struct drm_display_mode nl8048_mode = {
  89. /* NEC PIX Clock Ratings MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz */
  90. .clock = 23800,
  91. .hdisplay = 800,
  92. .hsync_start = 800 + 6,
  93. .hsync_end = 800 + 6 + 1,
  94. .htotal = 800 + 6 + 1 + 4,
  95. .vdisplay = 480,
  96. .vsync_start = 480 + 3,
  97. .vsync_end = 480 + 3 + 1,
  98. .vtotal = 480 + 3 + 1 + 4,
  99. .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  100. .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
  101. .width_mm = 89,
  102. .height_mm = 53,
  103. };
  104. static int nl8048_get_modes(struct drm_panel *panel,
  105. struct drm_connector *connector)
  106. {
  107. struct drm_display_mode *mode;
  108. mode = drm_mode_duplicate(connector->dev, &nl8048_mode);
  109. if (!mode)
  110. return -ENOMEM;
  111. drm_mode_set_name(mode);
  112. drm_mode_probed_add(connector, mode);
  113. connector->display_info.width_mm = nl8048_mode.width_mm;
  114. connector->display_info.height_mm = nl8048_mode.height_mm;
  115. connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
  116. | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
  117. | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
  118. return 1;
  119. }
  120. static const struct drm_panel_funcs nl8048_funcs = {
  121. .disable = nl8048_disable,
  122. .enable = nl8048_enable,
  123. .get_modes = nl8048_get_modes,
  124. };
  125. static int __maybe_unused nl8048_suspend(struct device *dev)
  126. {
  127. struct nl8048_panel *lcd = dev_get_drvdata(dev);
  128. nl8048_write(lcd, 2, 0x01);
  129. msleep(40);
  130. return 0;
  131. }
  132. static int __maybe_unused nl8048_resume(struct device *dev)
  133. {
  134. struct nl8048_panel *lcd = dev_get_drvdata(dev);
  135. /* Reinitialize the panel. */
  136. spi_setup(lcd->spi);
  137. nl8048_write(lcd, 2, 0x00);
  138. nl8048_init(lcd);
  139. return 0;
  140. }
  141. static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);
  142. static int nl8048_probe(struct spi_device *spi)
  143. {
  144. struct nl8048_panel *lcd;
  145. int ret;
  146. lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
  147. if (!lcd)
  148. return -ENOMEM;
  149. spi_set_drvdata(spi, lcd);
  150. lcd->spi = spi;
  151. lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
  152. if (IS_ERR(lcd->reset_gpio)) {
  153. dev_err(&spi->dev, "failed to parse reset gpio\n");
  154. return PTR_ERR(lcd->reset_gpio);
  155. }
  156. spi->mode = SPI_MODE_0;
  157. spi->bits_per_word = 32;
  158. ret = spi_setup(spi);
  159. if (ret < 0) {
  160. dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
  161. return ret;
  162. }
  163. ret = nl8048_init(lcd);
  164. if (ret < 0)
  165. return ret;
  166. drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,
  167. DRM_MODE_CONNECTOR_DPI);
  168. drm_panel_add(&lcd->panel);
  169. return 0;
  170. }
  171. static int nl8048_remove(struct spi_device *spi)
  172. {
  173. struct nl8048_panel *lcd = spi_get_drvdata(spi);
  174. drm_panel_remove(&lcd->panel);
  175. drm_panel_disable(&lcd->panel);
  176. drm_panel_unprepare(&lcd->panel);
  177. return 0;
  178. }
  179. static const struct of_device_id nl8048_of_match[] = {
  180. { .compatible = "nec,nl8048hl11", },
  181. { /* sentinel */ },
  182. };
  183. MODULE_DEVICE_TABLE(of, nl8048_of_match);
  184. static const struct spi_device_id nl8048_ids[] = {
  185. { "nl8048hl11", 0 },
  186. { /* sentinel */ }
  187. };
  188. MODULE_DEVICE_TABLE(spi, nl8048_ids);
  189. static struct spi_driver nl8048_driver = {
  190. .probe = nl8048_probe,
  191. .remove = nl8048_remove,
  192. .id_table = nl8048_ids,
  193. .driver = {
  194. .name = "panel-nec-nl8048hl11",
  195. .pm = &nl8048_pm_ops,
  196. .of_match_table = nl8048_of_match,
  197. },
  198. };
  199. module_spi_driver(nl8048_driver);
  200. MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
  201. MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
  202. MODULE_LICENSE("GPL");