1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
4  *
5  * base on panel-kingdisplay-kd097d04.c
6  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
7  */
8 
9 #include <linux/backlight.h>
10 #include <linux/delay.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/regulator/consumer.h>
15 
16 #include <video/mipi_display.h>
17 
18 #include <drm/drm_crtc.h>
19 #include <drm/drm_device.h>
20 #include <drm/drm_mipi_dsi.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_panel.h>
23 
24 struct ltk500hd1829 {
25 	struct device *dev;
26 	struct drm_panel panel;
27 	struct gpio_desc *reset_gpio;
28 	struct regulator *vcc;
29 	struct regulator *iovcc;
30 	bool prepared;
31 };
32 
33 struct ltk500hd1829_cmd {
34 	char cmd;
35 	char data;
36 };
37 
38 /*
39  * There is no description in the Reference Manual about these commands.
40  * We received them from the vendor, so just use them as is.
41  */
42 static const struct ltk500hd1829_cmd init_code[] = {
43 	{ 0xE0, 0x00 },
44 	{ 0xE1, 0x93 },
45 	{ 0xE2, 0x65 },
46 	{ 0xE3, 0xF8 },
47 	{ 0x80, 0x03 },
48 	{ 0xE0, 0x04 },
49 	{ 0x2D, 0x03 },
50 	{ 0xE0, 0x01 },
51 	{ 0x00, 0x00 },
52 	{ 0x01, 0xB6 },
53 	{ 0x03, 0x00 },
54 	{ 0x04, 0xC5 },
55 	{ 0x17, 0x00 },
56 	{ 0x18, 0xBF },
57 	{ 0x19, 0x01 },
58 	{ 0x1A, 0x00 },
59 	{ 0x1B, 0xBF },
60 	{ 0x1C, 0x01 },
61 	{ 0x1F, 0x7C },
62 	{ 0x20, 0x26 },
63 	{ 0x21, 0x26 },
64 	{ 0x22, 0x4E },
65 	{ 0x37, 0x09 },
66 	{ 0x38, 0x04 },
67 	{ 0x39, 0x08 },
68 	{ 0x3A, 0x1F },
69 	{ 0x3B, 0x1F },
70 	{ 0x3C, 0x78 },
71 	{ 0x3D, 0xFF },
72 	{ 0x3E, 0xFF },
73 	{ 0x3F, 0x00 },
74 	{ 0x40, 0x04 },
75 	{ 0x41, 0xA0 },
76 	{ 0x43, 0x0F },
77 	{ 0x44, 0x0A },
78 	{ 0x45, 0x24 },
79 	{ 0x55, 0x01 },
80 	{ 0x56, 0x01 },
81 	{ 0x57, 0xA5 },
82 	{ 0x58, 0x0A },
83 	{ 0x59, 0x4A },
84 	{ 0x5A, 0x38 },
85 	{ 0x5B, 0x10 },
86 	{ 0x5C, 0x19 },
87 	{ 0x5D, 0x7C },
88 	{ 0x5E, 0x64 },
89 	{ 0x5F, 0x54 },
90 	{ 0x60, 0x48 },
91 	{ 0x61, 0x44 },
92 	{ 0x62, 0x35 },
93 	{ 0x63, 0x3A },
94 	{ 0x64, 0x24 },
95 	{ 0x65, 0x3B },
96 	{ 0x66, 0x39 },
97 	{ 0x67, 0x37 },
98 	{ 0x68, 0x56 },
99 	{ 0x69, 0x41 },
100 	{ 0x6A, 0x47 },
101 	{ 0x6B, 0x2F },
102 	{ 0x6C, 0x23 },
103 	{ 0x6D, 0x13 },
104 	{ 0x6E, 0x02 },
105 	{ 0x6F, 0x08 },
106 	{ 0x70, 0x7C },
107 	{ 0x71, 0x64 },
108 	{ 0x72, 0x54 },
109 	{ 0x73, 0x48 },
110 	{ 0x74, 0x44 },
111 	{ 0x75, 0x35 },
112 	{ 0x76, 0x3A },
113 	{ 0x77, 0x22 },
114 	{ 0x78, 0x3B },
115 	{ 0x79, 0x39 },
116 	{ 0x7A, 0x38 },
117 	{ 0x7B, 0x52 },
118 	{ 0x7C, 0x41 },
119 	{ 0x7D, 0x47 },
120 	{ 0x7E, 0x2F },
121 	{ 0x7F, 0x23 },
122 	{ 0x80, 0x13 },
123 	{ 0x81, 0x02 },
124 	{ 0x82, 0x08 },
125 	{ 0xE0, 0x02 },
126 	{ 0x00, 0x57 },
127 	{ 0x01, 0x77 },
128 	{ 0x02, 0x44 },
129 	{ 0x03, 0x46 },
130 	{ 0x04, 0x48 },
131 	{ 0x05, 0x4A },
132 	{ 0x06, 0x4C },
133 	{ 0x07, 0x4E },
134 	{ 0x08, 0x50 },
135 	{ 0x09, 0x55 },
136 	{ 0x0A, 0x52 },
137 	{ 0x0B, 0x55 },
138 	{ 0x0C, 0x55 },
139 	{ 0x0D, 0x55 },
140 	{ 0x0E, 0x55 },
141 	{ 0x0F, 0x55 },
142 	{ 0x10, 0x55 },
143 	{ 0x11, 0x55 },
144 	{ 0x12, 0x55 },
145 	{ 0x13, 0x40 },
146 	{ 0x14, 0x55 },
147 	{ 0x15, 0x55 },
148 	{ 0x16, 0x57 },
149 	{ 0x17, 0x77 },
150 	{ 0x18, 0x45 },
151 	{ 0x19, 0x47 },
152 	{ 0x1A, 0x49 },
153 	{ 0x1B, 0x4B },
154 	{ 0x1C, 0x4D },
155 	{ 0x1D, 0x4F },
156 	{ 0x1E, 0x51 },
157 	{ 0x1F, 0x55 },
158 	{ 0x20, 0x53 },
159 	{ 0x21, 0x55 },
160 	{ 0x22, 0x55 },
161 	{ 0x23, 0x55 },
162 	{ 0x24, 0x55 },
163 	{ 0x25, 0x55 },
164 	{ 0x26, 0x55 },
165 	{ 0x27, 0x55 },
166 	{ 0x28, 0x55 },
167 	{ 0x29, 0x41 },
168 	{ 0x2A, 0x55 },
169 	{ 0x2B, 0x55 },
170 	{ 0x2C, 0x57 },
171 	{ 0x2D, 0x77 },
172 	{ 0x2E, 0x4F },
173 	{ 0x2F, 0x4D },
174 	{ 0x30, 0x4B },
175 	{ 0x31, 0x49 },
176 	{ 0x32, 0x47 },
177 	{ 0x33, 0x45 },
178 	{ 0x34, 0x41 },
179 	{ 0x35, 0x55 },
180 	{ 0x36, 0x53 },
181 	{ 0x37, 0x55 },
182 	{ 0x38, 0x55 },
183 	{ 0x39, 0x55 },
184 	{ 0x3A, 0x55 },
185 	{ 0x3B, 0x55 },
186 	{ 0x3C, 0x55 },
187 	{ 0x3D, 0x55 },
188 	{ 0x3E, 0x55 },
189 	{ 0x3F, 0x51 },
190 	{ 0x40, 0x55 },
191 	{ 0x41, 0x55 },
192 	{ 0x42, 0x57 },
193 	{ 0x43, 0x77 },
194 	{ 0x44, 0x4E },
195 	{ 0x45, 0x4C },
196 	{ 0x46, 0x4A },
197 	{ 0x47, 0x48 },
198 	{ 0x48, 0x46 },
199 	{ 0x49, 0x44 },
200 	{ 0x4A, 0x40 },
201 	{ 0x4B, 0x55 },
202 	{ 0x4C, 0x52 },
203 	{ 0x4D, 0x55 },
204 	{ 0x4E, 0x55 },
205 	{ 0x4F, 0x55 },
206 	{ 0x50, 0x55 },
207 	{ 0x51, 0x55 },
208 	{ 0x52, 0x55 },
209 	{ 0x53, 0x55 },
210 	{ 0x54, 0x55 },
211 	{ 0x55, 0x50 },
212 	{ 0x56, 0x55 },
213 	{ 0x57, 0x55 },
214 	{ 0x58, 0x40 },
215 	{ 0x59, 0x00 },
216 	{ 0x5A, 0x00 },
217 	{ 0x5B, 0x10 },
218 	{ 0x5C, 0x09 },
219 	{ 0x5D, 0x30 },
220 	{ 0x5E, 0x01 },
221 	{ 0x5F, 0x02 },
222 	{ 0x60, 0x30 },
223 	{ 0x61, 0x03 },
224 	{ 0x62, 0x04 },
225 	{ 0x63, 0x06 },
226 	{ 0x64, 0x6A },
227 	{ 0x65, 0x75 },
228 	{ 0x66, 0x0F },
229 	{ 0x67, 0xB3 },
230 	{ 0x68, 0x0B },
231 	{ 0x69, 0x06 },
232 	{ 0x6A, 0x6A },
233 	{ 0x6B, 0x10 },
234 	{ 0x6C, 0x00 },
235 	{ 0x6D, 0x04 },
236 	{ 0x6E, 0x04 },
237 	{ 0x6F, 0x88 },
238 	{ 0x70, 0x00 },
239 	{ 0x71, 0x00 },
240 	{ 0x72, 0x06 },
241 	{ 0x73, 0x7B },
242 	{ 0x74, 0x00 },
243 	{ 0x75, 0xBC },
244 	{ 0x76, 0x00 },
245 	{ 0x77, 0x05 },
246 	{ 0x78, 0x2E },
247 	{ 0x79, 0x00 },
248 	{ 0x7A, 0x00 },
249 	{ 0x7B, 0x00 },
250 	{ 0x7C, 0x00 },
251 	{ 0x7D, 0x03 },
252 	{ 0x7E, 0x7B },
253 	{ 0xE0, 0x04 },
254 	{ 0x09, 0x10 },
255 	{ 0x2B, 0x2B },
256 	{ 0x2E, 0x44 },
257 	{ 0xE0, 0x00 },
258 	{ 0xE6, 0x02 },
259 	{ 0xE7, 0x02 },
260 	{ 0x35, 0x00 },
261 };
262 
263 static inline
264 struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
265 {
266 	return container_of(panel, struct ltk500hd1829, panel);
267 }
268 
269 static int ltk500hd1829_unprepare(struct drm_panel *panel)
270 {
271 	struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
272 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
273 	int ret;
274 
275 	if (!ctx->prepared)
276 		return 0;
277 
278 	ret = mipi_dsi_dcs_set_display_off(dsi);
279 	if (ret < 0)
280 		dev_err(panel->dev, "failed to set display off: %d\n", ret);
281 
282 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
283 	if (ret < 0) {
284 		dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
285 	}
286 
287 	/* 120ms to enter sleep mode */
288 	msleep(120);
289 
290 	regulator_disable(ctx->iovcc);
291 	regulator_disable(ctx->vcc);
292 
293 	ctx->prepared = false;
294 
295 	return 0;
296 }
297 
298 static int ltk500hd1829_prepare(struct drm_panel *panel)
299 {
300 	struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
301 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
302 	unsigned int i;
303 	int ret;
304 
305 	if (ctx->prepared)
306 		return 0;
307 
308 	ret = regulator_enable(ctx->vcc);
309 	if (ret < 0) {
310 		dev_err(ctx->dev, "Failed to enable vci supply: %d\n", ret);
311 		return ret;
312 	}
313 	ret = regulator_enable(ctx->iovcc);
314 	if (ret < 0) {
315 		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
316 		goto disable_vcc;
317 	}
318 
319 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
320 	/* tRW: 10us */
321 	usleep_range(10, 20);
322 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
323 
324 	/* tRT: >= 5ms */
325 	usleep_range(5000, 6000);
326 
327 	for (i = 0; i < ARRAY_SIZE(init_code); i++) {
328 		ret = mipi_dsi_generic_write(dsi, &init_code[i],
329 					     sizeof(struct ltk500hd1829_cmd));
330 		if (ret < 0) {
331 			dev_err(panel->dev, "failed to write init cmds: %d\n", ret);
332 			goto disable_iovcc;
333 		}
334 	}
335 
336 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
337 	if (ret < 0) {
338 		dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
339 		goto disable_iovcc;
340 	}
341 
342 	/* 120ms to exit sleep mode */
343 	msleep(120);
344 
345 	ret = mipi_dsi_dcs_set_display_on(dsi);
346 	if (ret < 0) {
347 		dev_err(panel->dev, "failed to set display on: %d\n", ret);
348 		goto disable_iovcc;
349 	}
350 
351 	ctx->prepared = true;
352 
353 	return 0;
354 
355 disable_iovcc:
356 	regulator_disable(ctx->iovcc);
357 disable_vcc:
358 	regulator_disable(ctx->vcc);
359 	return ret;
360 }
361 
362 static const struct drm_display_mode default_mode = {
363 	.hdisplay	= 720,
364 	.hsync_start	= 720 + 50,
365 	.hsync_end	= 720 + 50 + 50,
366 	.htotal		= 720 + 50 + 50 + 50,
367 	.vdisplay	= 1280,
368 	.vsync_start	= 1280 + 30,
369 	.vsync_end	= 1280 + 30 + 4,
370 	.vtotal		= 1280 + 30 + 4 + 12,
371 	.clock		= 69217,
372 	.width_mm	= 62,
373 	.height_mm	= 110,
374 };
375 
376 static int ltk500hd1829_get_modes(struct drm_panel *panel,
377 				  struct drm_connector *connector)
378 {
379 	struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
380 	struct drm_display_mode *mode;
381 
382 	mode = drm_mode_duplicate(connector->dev, &default_mode);
383 	if (!mode) {
384 		dev_err(ctx->dev, "failed to add mode %ux%u@%u\n",
385 			default_mode.hdisplay, default_mode.vdisplay,
386 			drm_mode_vrefresh(&default_mode));
387 		return -ENOMEM;
388 	}
389 
390 	drm_mode_set_name(mode);
391 
392 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
393 	connector->display_info.width_mm = mode->width_mm;
394 	connector->display_info.height_mm = mode->height_mm;
395 	drm_mode_probed_add(connector, mode);
396 
397 	return 1;
398 }
399 
400 static const struct drm_panel_funcs ltk500hd1829_funcs = {
401 	.unprepare = ltk500hd1829_unprepare,
402 	.prepare = ltk500hd1829_prepare,
403 	.get_modes = ltk500hd1829_get_modes,
404 };
405 
406 static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
407 {
408 	struct ltk500hd1829 *ctx;
409 	struct device *dev = &dsi->dev;
410 	int ret;
411 
412 	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
413 	if (!ctx)
414 		return -ENOMEM;
415 
416 	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
417 	if (IS_ERR(ctx->reset_gpio)) {
418 		dev_err(dev, "cannot get reset gpio\n");
419 		return PTR_ERR(ctx->reset_gpio);
420 	}
421 
422 	ctx->vcc = devm_regulator_get(dev, "vcc");
423 	if (IS_ERR(ctx->vcc)) {
424 		ret = PTR_ERR(ctx->vcc);
425 		if (ret != -EPROBE_DEFER)
426 			dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
427 		return ret;
428 	}
429 
430 	ctx->iovcc = devm_regulator_get(dev, "iovcc");
431 	if (IS_ERR(ctx->iovcc)) {
432 		ret = PTR_ERR(ctx->iovcc);
433 		if (ret != -EPROBE_DEFER)
434 			dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
435 		return ret;
436 	}
437 
438 	mipi_dsi_set_drvdata(dsi, ctx);
439 
440 	ctx->dev = dev;
441 
442 	dsi->lanes = 4;
443 	dsi->format = MIPI_DSI_FMT_RGB888;
444 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
445 			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;
446 
447 	drm_panel_init(&ctx->panel, &dsi->dev, &ltk500hd1829_funcs,
448 		       DRM_MODE_CONNECTOR_DSI);
449 
450 	ret = drm_panel_of_backlight(&ctx->panel);
451 	if (ret)
452 		return ret;
453 
454 	drm_panel_add(&ctx->panel);
455 
456 	ret = mipi_dsi_attach(dsi);
457 	if (ret < 0) {
458 		dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
459 		drm_panel_remove(&ctx->panel);
460 		return ret;
461 	}
462 
463 	return 0;
464 }
465 
466 static void ltk500hd1829_shutdown(struct mipi_dsi_device *dsi)
467 {
468 	struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
469 	int ret;
470 
471 	ret = drm_panel_unprepare(&ctx->panel);
472 	if (ret < 0)
473 		dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
474 
475 	ret = drm_panel_disable(&ctx->panel);
476 	if (ret < 0)
477 		dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
478 }
479 
480 static int ltk500hd1829_remove(struct mipi_dsi_device *dsi)
481 {
482 	struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
483 	int ret;
484 
485 	ltk500hd1829_shutdown(dsi);
486 
487 	ret = mipi_dsi_detach(dsi);
488 	if (ret < 0)
489 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
490 
491 	drm_panel_remove(&ctx->panel);
492 
493 	return 0;
494 }
495 
496 static const struct of_device_id ltk500hd1829_of_match[] = {
497 	{ .compatible = "leadtek,ltk500hd1829", },
498 	{ /* sentinel */ }
499 };
500 MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);
501 
502 static struct mipi_dsi_driver ltk500hd1829_driver = {
503 	.driver = {
504 		.name = "panel-leadtek-ltk500hd1829",
505 		.of_match_table = ltk500hd1829_of_match,
506 	},
507 	.probe = ltk500hd1829_probe,
508 	.remove = ltk500hd1829_remove,
509 	.shutdown = ltk500hd1829_shutdown,
510 };
511 module_mipi_dsi_driver(ltk500hd1829_driver);
512 
513 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
514 MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
515 MODULE_LICENSE("GPL v2");
516