1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * NewVision NV3052C IPS LCD panel driver
4  *
5  * Copyright (C) 2020, Paul Cercueil <paul@crapouillou.net>
6  * Copyright (C) 2022, Christophe Branchereau <cbranchereau@gmail.com>
7  */
8 
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/media-bus-format.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/spi/spi.h>
18 #include <video/mipi_display.h>
19 #include <drm/drm_mipi_dbi.h>
20 #include <drm/drm_modes.h>
21 #include <drm/drm_panel.h>
22 
23 struct nv3052c_panel_info {
24 	const struct drm_display_mode *display_modes;
25 	unsigned int num_modes;
26 	u16 width_mm, height_mm;
27 	u32 bus_format, bus_flags;
28 };
29 
30 struct nv3052c {
31 	struct device *dev;
32 	struct drm_panel panel;
33 	struct mipi_dbi dbi;
34 	const struct nv3052c_panel_info *panel_info;
35 	struct regulator *supply;
36 	struct gpio_desc *reset_gpio;
37 };
38 
39 struct nv3052c_reg {
40 	u8 cmd;
41 	u8 val;
42 };
43 
44 static const struct nv3052c_reg nv3052c_panel_regs[] = {
45 	{ 0xff, 0x30 },
46 	{ 0xff, 0x52 },
47 	{ 0xff, 0x01 },
48 	{ 0xe3, 0x00 },
49 	{ 0x40, 0x00 },
50 	{ 0x03, 0x40 },
51 	{ 0x04, 0x00 },
52 	{ 0x05, 0x03 },
53 	{ 0x08, 0x00 },
54 	{ 0x09, 0x07 },
55 	{ 0x0a, 0x01 },
56 	{ 0x0b, 0x32 },
57 	{ 0x0c, 0x32 },
58 	{ 0x0d, 0x0b },
59 	{ 0x0e, 0x00 },
60 	{ 0x23, 0xa0 },
61 	{ 0x24, 0x0c },
62 	{ 0x25, 0x06 },
63 	{ 0x26, 0x14 },
64 	{ 0x27, 0x14 },
65 	{ 0x38, 0xcc },
66 	{ 0x39, 0xd7 },
67 	{ 0x3a, 0x4a },
68 	{ 0x28, 0x40 },
69 	{ 0x29, 0x01 },
70 	{ 0x2a, 0xdf },
71 	{ 0x49, 0x3c },
72 	{ 0x91, 0x77 },
73 	{ 0x92, 0x77 },
74 	{ 0xa0, 0x55 },
75 	{ 0xa1, 0x50 },
76 	{ 0xa4, 0x9c },
77 	{ 0xa7, 0x02 },
78 	{ 0xa8, 0x01 },
79 	{ 0xa9, 0x01 },
80 	{ 0xaa, 0xfc },
81 	{ 0xab, 0x28 },
82 	{ 0xac, 0x06 },
83 	{ 0xad, 0x06 },
84 	{ 0xae, 0x06 },
85 	{ 0xaf, 0x03 },
86 	{ 0xb0, 0x08 },
87 	{ 0xb1, 0x26 },
88 	{ 0xb2, 0x28 },
89 	{ 0xb3, 0x28 },
90 	{ 0xb4, 0x33 },
91 	{ 0xb5, 0x08 },
92 	{ 0xb6, 0x26 },
93 	{ 0xb7, 0x08 },
94 	{ 0xb8, 0x26 },
95 	{ 0xf0, 0x00 },
96 	{ 0xf6, 0xc0 },
97 	{ 0xff, 0x30 },
98 	{ 0xff, 0x52 },
99 	{ 0xff, 0x02 },
100 	{ 0xb0, 0x0b },
101 	{ 0xb1, 0x16 },
102 	{ 0xb2, 0x17 },
103 	{ 0xb3, 0x2c },
104 	{ 0xb4, 0x32 },
105 	{ 0xb5, 0x3b },
106 	{ 0xb6, 0x29 },
107 	{ 0xb7, 0x40 },
108 	{ 0xb8, 0x0d },
109 	{ 0xb9, 0x05 },
110 	{ 0xba, 0x12 },
111 	{ 0xbb, 0x10 },
112 	{ 0xbc, 0x12 },
113 	{ 0xbd, 0x15 },
114 	{ 0xbe, 0x19 },
115 	{ 0xbf, 0x0e },
116 	{ 0xc0, 0x16 },
117 	{ 0xc1, 0x0a },
118 	{ 0xd0, 0x0c },
119 	{ 0xd1, 0x17 },
120 	{ 0xd2, 0x14 },
121 	{ 0xd3, 0x2e },
122 	{ 0xd4, 0x32 },
123 	{ 0xd5, 0x3c },
124 	{ 0xd6, 0x22 },
125 	{ 0xd7, 0x3d },
126 	{ 0xd8, 0x0d },
127 	{ 0xd9, 0x07 },
128 	{ 0xda, 0x13 },
129 	{ 0xdb, 0x13 },
130 	{ 0xdc, 0x11 },
131 	{ 0xdd, 0x15 },
132 	{ 0xde, 0x19 },
133 	{ 0xdf, 0x10 },
134 	{ 0xe0, 0x17 },
135 	{ 0xe1, 0x0a },
136 	{ 0xff, 0x30 },
137 	{ 0xff, 0x52 },
138 	{ 0xff, 0x03 },
139 	{ 0x00, 0x2a },
140 	{ 0x01, 0x2a },
141 	{ 0x02, 0x2a },
142 	{ 0x03, 0x2a },
143 	{ 0x04, 0x61 },
144 	{ 0x05, 0x80 },
145 	{ 0x06, 0xc7 },
146 	{ 0x07, 0x01 },
147 	{ 0x08, 0x03 },
148 	{ 0x09, 0x04 },
149 	{ 0x70, 0x22 },
150 	{ 0x71, 0x80 },
151 	{ 0x30, 0x2a },
152 	{ 0x31, 0x2a },
153 	{ 0x32, 0x2a },
154 	{ 0x33, 0x2a },
155 	{ 0x34, 0x61 },
156 	{ 0x35, 0xc5 },
157 	{ 0x36, 0x80 },
158 	{ 0x37, 0x23 },
159 	{ 0x40, 0x03 },
160 	{ 0x41, 0x04 },
161 	{ 0x42, 0x05 },
162 	{ 0x43, 0x06 },
163 	{ 0x44, 0x11 },
164 	{ 0x45, 0xe8 },
165 	{ 0x46, 0xe9 },
166 	{ 0x47, 0x11 },
167 	{ 0x48, 0xea },
168 	{ 0x49, 0xeb },
169 	{ 0x50, 0x07 },
170 	{ 0x51, 0x08 },
171 	{ 0x52, 0x09 },
172 	{ 0x53, 0x0a },
173 	{ 0x54, 0x11 },
174 	{ 0x55, 0xec },
175 	{ 0x56, 0xed },
176 	{ 0x57, 0x11 },
177 	{ 0x58, 0xef },
178 	{ 0x59, 0xf0 },
179 	{ 0xb1, 0x01 },
180 	{ 0xb4, 0x15 },
181 	{ 0xb5, 0x16 },
182 	{ 0xb6, 0x09 },
183 	{ 0xb7, 0x0f },
184 	{ 0xb8, 0x0d },
185 	{ 0xb9, 0x0b },
186 	{ 0xba, 0x00 },
187 	{ 0xc7, 0x02 },
188 	{ 0xca, 0x17 },
189 	{ 0xcb, 0x18 },
190 	{ 0xcc, 0x0a },
191 	{ 0xcd, 0x10 },
192 	{ 0xce, 0x0e },
193 	{ 0xcf, 0x0c },
194 	{ 0xd0, 0x00 },
195 	{ 0x81, 0x00 },
196 	{ 0x84, 0x15 },
197 	{ 0x85, 0x16 },
198 	{ 0x86, 0x10 },
199 	{ 0x87, 0x0a },
200 	{ 0x88, 0x0c },
201 	{ 0x89, 0x0e },
202 	{ 0x8a, 0x02 },
203 	{ 0x97, 0x00 },
204 	{ 0x9a, 0x17 },
205 	{ 0x9b, 0x18 },
206 	{ 0x9c, 0x0f },
207 	{ 0x9d, 0x09 },
208 	{ 0x9e, 0x0b },
209 	{ 0x9f, 0x0d },
210 	{ 0xa0, 0x01 },
211 	{ 0xff, 0x30 },
212 	{ 0xff, 0x52 },
213 	{ 0xff, 0x02 },
214 	{ 0x01, 0x01 },
215 	{ 0x02, 0xda },
216 	{ 0x03, 0xba },
217 	{ 0x04, 0xa8 },
218 	{ 0x05, 0x9a },
219 	{ 0x06, 0x70 },
220 	{ 0x07, 0xff },
221 	{ 0x08, 0x91 },
222 	{ 0x09, 0x90 },
223 	{ 0x0a, 0xff },
224 	{ 0x0b, 0x8f },
225 	{ 0x0c, 0x60 },
226 	{ 0x0d, 0x58 },
227 	{ 0x0e, 0x48 },
228 	{ 0x0f, 0x38 },
229 	{ 0x10, 0x2b },
230 	{ 0xff, 0x30 },
231 	{ 0xff, 0x52 },
232 	{ 0xff, 0x00 },
233 	{ 0x36, 0x0a },
234 };
235 
to_nv3052c(struct drm_panel * panel)236 static inline struct nv3052c *to_nv3052c(struct drm_panel *panel)
237 {
238 	return container_of(panel, struct nv3052c, panel);
239 }
240 
nv3052c_prepare(struct drm_panel * panel)241 static int nv3052c_prepare(struct drm_panel *panel)
242 {
243 	struct nv3052c *priv = to_nv3052c(panel);
244 	struct mipi_dbi *dbi = &priv->dbi;
245 	unsigned int i;
246 	int err;
247 
248 	err = regulator_enable(priv->supply);
249 	if (err) {
250 		dev_err(priv->dev, "Failed to enable power supply: %d\n", err);
251 		return err;
252 	}
253 
254 	/* Reset the chip */
255 	gpiod_set_value_cansleep(priv->reset_gpio, 1);
256 	usleep_range(10, 1000);
257 	gpiod_set_value_cansleep(priv->reset_gpio, 0);
258 	usleep_range(5000, 20000);
259 
260 	for (i = 0; i < ARRAY_SIZE(nv3052c_panel_regs); i++) {
261 		err = mipi_dbi_command(dbi, nv3052c_panel_regs[i].cmd,
262 				       nv3052c_panel_regs[i].val);
263 
264 		if (err) {
265 			dev_err(priv->dev, "Unable to set register: %d\n", err);
266 			goto err_disable_regulator;
267 		}
268 	}
269 
270 	err = mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
271 	if (err) {
272 		dev_err(priv->dev, "Unable to exit sleep mode: %d\n", err);
273 		goto err_disable_regulator;
274 	}
275 
276 	return 0;
277 
278 err_disable_regulator:
279 	regulator_disable(priv->supply);
280 	return err;
281 }
282 
nv3052c_unprepare(struct drm_panel * panel)283 static int nv3052c_unprepare(struct drm_panel *panel)
284 {
285 	struct nv3052c *priv = to_nv3052c(panel);
286 	struct mipi_dbi *dbi = &priv->dbi;
287 	int err;
288 
289 	err = mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
290 	if (err)
291 		dev_err(priv->dev, "Unable to enter sleep mode: %d\n", err);
292 
293 	gpiod_set_value_cansleep(priv->reset_gpio, 1);
294 	regulator_disable(priv->supply);
295 
296 	return 0;
297 }
298 
nv3052c_enable(struct drm_panel * panel)299 static int nv3052c_enable(struct drm_panel *panel)
300 {
301 	struct nv3052c *priv = to_nv3052c(panel);
302 	struct mipi_dbi *dbi = &priv->dbi;
303 	int err;
304 
305 	err = mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
306 	if (err) {
307 		dev_err(priv->dev, "Unable to enable display: %d\n", err);
308 		return err;
309 	}
310 
311 	if (panel->backlight) {
312 		/* Wait for the picture to be ready before enabling backlight */
313 		msleep(120);
314 	}
315 
316 	return 0;
317 }
318 
nv3052c_disable(struct drm_panel * panel)319 static int nv3052c_disable(struct drm_panel *panel)
320 {
321 	struct nv3052c *priv = to_nv3052c(panel);
322 	struct mipi_dbi *dbi = &priv->dbi;
323 	int err;
324 
325 	err = mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
326 	if (err) {
327 		dev_err(priv->dev, "Unable to disable display: %d\n", err);
328 		return err;
329 	}
330 
331 	return 0;
332 }
333 
nv3052c_get_modes(struct drm_panel * panel,struct drm_connector * connector)334 static int nv3052c_get_modes(struct drm_panel *panel,
335 			     struct drm_connector *connector)
336 {
337 	struct nv3052c *priv = to_nv3052c(panel);
338 	const struct nv3052c_panel_info *panel_info = priv->panel_info;
339 	struct drm_display_mode *mode;
340 	unsigned int i;
341 
342 	for (i = 0; i < panel_info->num_modes; i++) {
343 		mode = drm_mode_duplicate(connector->dev,
344 					  &panel_info->display_modes[i]);
345 		if (!mode)
346 			return -ENOMEM;
347 
348 		drm_mode_set_name(mode);
349 
350 		mode->type = DRM_MODE_TYPE_DRIVER;
351 		if (panel_info->num_modes == 1)
352 			mode->type |= DRM_MODE_TYPE_PREFERRED;
353 
354 		drm_mode_probed_add(connector, mode);
355 	}
356 
357 	connector->display_info.bpc = 8;
358 	connector->display_info.width_mm = panel_info->width_mm;
359 	connector->display_info.height_mm = panel_info->height_mm;
360 
361 	drm_display_info_set_bus_formats(&connector->display_info,
362 					 &panel_info->bus_format, 1);
363 	connector->display_info.bus_flags = panel_info->bus_flags;
364 
365 	return panel_info->num_modes;
366 }
367 
368 static const struct drm_panel_funcs nv3052c_funcs = {
369 	.prepare	= nv3052c_prepare,
370 	.unprepare	= nv3052c_unprepare,
371 	.enable		= nv3052c_enable,
372 	.disable	= nv3052c_disable,
373 	.get_modes	= nv3052c_get_modes,
374 };
375 
nv3052c_probe(struct spi_device * spi)376 static int nv3052c_probe(struct spi_device *spi)
377 {
378 	struct device *dev = &spi->dev;
379 	struct nv3052c *priv;
380 	int err;
381 
382 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
383 	if (!priv)
384 		return -ENOMEM;
385 
386 	priv->dev = dev;
387 
388 	priv->panel_info = of_device_get_match_data(dev);
389 	if (!priv->panel_info)
390 		return -EINVAL;
391 
392 	priv->supply = devm_regulator_get(dev, "power");
393 	if (IS_ERR(priv->supply))
394 		return dev_err_probe(dev, PTR_ERR(priv->supply), "Failed to get power supply\n");
395 
396 	priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
397 	if (IS_ERR(priv->reset_gpio))
398 		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), "Failed to get reset GPIO\n");
399 
400 	err = mipi_dbi_spi_init(spi, &priv->dbi, NULL);
401 	if (err)
402 		return dev_err_probe(dev, err, "MIPI DBI init failed\n");
403 
404 	priv->dbi.read_commands = NULL;
405 
406 	spi_set_drvdata(spi, priv);
407 
408 	drm_panel_init(&priv->panel, dev, &nv3052c_funcs,
409 		       DRM_MODE_CONNECTOR_DPI);
410 
411 	err = drm_panel_of_backlight(&priv->panel);
412 	if (err)
413 		return dev_err_probe(dev, err, "Failed to attach backlight\n");
414 
415 	drm_panel_add(&priv->panel);
416 
417 	return 0;
418 }
419 
nv3052c_remove(struct spi_device * spi)420 static void nv3052c_remove(struct spi_device *spi)
421 {
422 	struct nv3052c *priv = spi_get_drvdata(spi);
423 
424 	drm_panel_remove(&priv->panel);
425 	drm_panel_disable(&priv->panel);
426 	drm_panel_unprepare(&priv->panel);
427 }
428 
429 static const struct drm_display_mode ltk035c5444t_modes[] = {
430 	{ /* 60 Hz */
431 		.clock = 24000,
432 		.hdisplay = 640,
433 		.hsync_start = 640 + 96,
434 		.hsync_end = 640 + 96 + 16,
435 		.htotal = 640 + 96 + 16 + 48,
436 		.vdisplay = 480,
437 		.vsync_start = 480 + 5,
438 		.vsync_end = 480 + 5 + 2,
439 		.vtotal = 480 + 5 + 2 + 13,
440 		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
441 	},
442 	{ /* 50 Hz */
443 		.clock = 18000,
444 		.hdisplay = 640,
445 		.hsync_start = 640 + 39,
446 		.hsync_end = 640 + 39 + 2,
447 		.htotal = 640 + 39 + 2 + 39,
448 		.vdisplay = 480,
449 		.vsync_start = 480 + 5,
450 		.vsync_end = 480 + 5 + 2,
451 		.vtotal = 480 + 5 + 2 + 13,
452 		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
453 	},
454 };
455 
456 static const struct nv3052c_panel_info ltk035c5444t_panel_info = {
457 	.display_modes = ltk035c5444t_modes,
458 	.num_modes = ARRAY_SIZE(ltk035c5444t_modes),
459 	.width_mm = 77,
460 	.height_mm = 64,
461 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
462 	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
463 };
464 
465 static const struct of_device_id nv3052c_of_match[] = {
466 	{ .compatible = "leadtek,ltk035c5444t", .data = &ltk035c5444t_panel_info },
467 	{ /* sentinel */ }
468 };
469 MODULE_DEVICE_TABLE(of, nv3052c_of_match);
470 
471 static struct spi_driver nv3052c_driver = {
472 	.driver = {
473 		.name = "nv3052c",
474 		.of_match_table = nv3052c_of_match,
475 	},
476 	.probe = nv3052c_probe,
477 	.remove = nv3052c_remove,
478 };
479 module_spi_driver(nv3052c_driver);
480 
481 MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
482 MODULE_AUTHOR("Christophe Branchereau <cbranchereau@gmail.com>");
483 MODULE_LICENSE("GPL v2");
484