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