1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2016 InforceComputing
4 * Author: Vinay Simha BN <simhavcs@gmail.com>
5 *
6 * Copyright (C) 2016 Linaro Ltd
7 * Author: Sumit Semwal <sumit.semwal@linaro.org>
8 */
9
10#include <linux/backlight.h>
11#include <linux/delay.h>
12#include <linux/gpio/consumer.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/regulator/consumer.h>
16
17#include <video/mipi_display.h>
18
19#include <drm/drm_crtc.h>
20#include <drm/drm_mipi_dsi.h>
21#include <drm/drm_modes.h>
22#include <drm/drm_panel.h>
23
24static const char * const regulator_names[] = {
25	"vddp",
26	"iovcc"
27};
28
29struct jdi_panel {
30	struct drm_panel base;
31	struct mipi_dsi_device *dsi;
32
33	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
34
35	struct gpio_desc *enable_gpio;
36	struct gpio_desc *reset_gpio;
37	struct gpio_desc *dcdc_en_gpio;
38	struct backlight_device *backlight;
39
40	bool prepared;
41	bool enabled;
42
43	const struct drm_display_mode *mode;
44};
45
46static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
47{
48	return container_of(panel, struct jdi_panel, base);
49}
50
51static int jdi_panel_init(struct jdi_panel *jdi)
52{
53	struct mipi_dsi_device *dsi = jdi->dsi;
54	struct device *dev = &jdi->dsi->dev;
55	int ret;
56
57	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
58
59	ret = mipi_dsi_dcs_soft_reset(dsi);
60	if (ret < 0)
61		return ret;
62
63	usleep_range(10000, 20000);
64
65	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
66	if (ret < 0) {
67		dev_err(dev, "failed to set pixel format: %d\n", ret);
68		return ret;
69	}
70
71	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
72	if (ret < 0) {
73		dev_err(dev, "failed to set column address: %d\n", ret);
74		return ret;
75	}
76
77	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
78	if (ret < 0) {
79		dev_err(dev, "failed to set page address: %d\n", ret);
80		return ret;
81	}
82
83	/*
84	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
85	 *                  are active
86	 * BIT(3) BL = 1    Backlight Control On
87	 * BIT(2) DD = 0    Display Dimming is Off
88	 */
89	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
90				 (u8[]){ 0x24 }, 1);
91	if (ret < 0) {
92		dev_err(dev, "failed to write control display: %d\n", ret);
93		return ret;
94	}
95
96	/* CABC off */
97	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
98				 (u8[]){ 0x00 }, 1);
99	if (ret < 0) {
100		dev_err(dev, "failed to set cabc off: %d\n", ret);
101		return ret;
102	}
103
104	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
105	if (ret < 0) {
106		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
107		return ret;
108	}
109
110	msleep(120);
111
112	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
113	if (ret < 0) {
114		dev_err(dev, "failed to set mcap: %d\n", ret);
115		return ret;
116	}
117
118	mdelay(10);
119
120	/* Interface setting, video mode */
121	ret = mipi_dsi_generic_write(dsi, (u8[])
122				     {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
123	if (ret < 0) {
124		dev_err(dev, "failed to set display interface setting: %d\n"
125			, ret);
126		return ret;
127	}
128
129	mdelay(20);
130
131	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
132	if (ret < 0) {
133		dev_err(dev, "failed to set default values for mcap: %d\n"
134			, ret);
135		return ret;
136	}
137
138	return 0;
139}
140
141static int jdi_panel_on(struct jdi_panel *jdi)
142{
143	struct mipi_dsi_device *dsi = jdi->dsi;
144	struct device *dev = &jdi->dsi->dev;
145	int ret;
146
147	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
148
149	ret = mipi_dsi_dcs_set_display_on(dsi);
150	if (ret < 0)
151		dev_err(dev, "failed to set display on: %d\n", ret);
152
153	return ret;
154}
155
156static void jdi_panel_off(struct jdi_panel *jdi)
157{
158	struct mipi_dsi_device *dsi = jdi->dsi;
159	struct device *dev = &jdi->dsi->dev;
160	int ret;
161
162	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
163
164	ret = mipi_dsi_dcs_set_display_off(dsi);
165	if (ret < 0)
166		dev_err(dev, "failed to set display off: %d\n", ret);
167
168	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
169	if (ret < 0)
170		dev_err(dev, "failed to enter sleep mode: %d\n", ret);
171
172	msleep(100);
173}
174
175static int jdi_panel_disable(struct drm_panel *panel)
176{
177	struct jdi_panel *jdi = to_jdi_panel(panel);
178
179	if (!jdi->enabled)
180		return 0;
181
182	backlight_disable(jdi->backlight);
183
184	jdi->enabled = false;
185
186	return 0;
187}
188
189static int jdi_panel_unprepare(struct drm_panel *panel)
190{
191	struct jdi_panel *jdi = to_jdi_panel(panel);
192	struct device *dev = &jdi->dsi->dev;
193	int ret;
194
195	if (!jdi->prepared)
196		return 0;
197
198	jdi_panel_off(jdi);
199
200	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
201	if (ret < 0)
202		dev_err(dev, "regulator disable failed, %d\n", ret);
203
204	gpiod_set_value(jdi->enable_gpio, 0);
205
206	gpiod_set_value(jdi->reset_gpio, 1);
207
208	gpiod_set_value(jdi->dcdc_en_gpio, 0);
209
210	jdi->prepared = false;
211
212	return 0;
213}
214
215static int jdi_panel_prepare(struct drm_panel *panel)
216{
217	struct jdi_panel *jdi = to_jdi_panel(panel);
218	struct device *dev = &jdi->dsi->dev;
219	int ret;
220
221	if (jdi->prepared)
222		return 0;
223
224	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
225	if (ret < 0) {
226		dev_err(dev, "regulator enable failed, %d\n", ret);
227		return ret;
228	}
229
230	msleep(20);
231
232	gpiod_set_value(jdi->dcdc_en_gpio, 1);
233	usleep_range(10, 20);
234
235	gpiod_set_value(jdi->reset_gpio, 0);
236	usleep_range(10, 20);
237
238	gpiod_set_value(jdi->enable_gpio, 1);
239	usleep_range(10, 20);
240
241	ret = jdi_panel_init(jdi);
242	if (ret < 0) {
243		dev_err(dev, "failed to init panel: %d\n", ret);
244		goto poweroff;
245	}
246
247	ret = jdi_panel_on(jdi);
248	if (ret < 0) {
249		dev_err(dev, "failed to set panel on: %d\n", ret);
250		goto poweroff;
251	}
252
253	jdi->prepared = true;
254
255	return 0;
256
257poweroff:
258	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
259	if (ret < 0)
260		dev_err(dev, "regulator disable failed, %d\n", ret);
261
262	gpiod_set_value(jdi->enable_gpio, 0);
263
264	gpiod_set_value(jdi->reset_gpio, 1);
265
266	gpiod_set_value(jdi->dcdc_en_gpio, 0);
267
268	return ret;
269}
270
271static int jdi_panel_enable(struct drm_panel *panel)
272{
273	struct jdi_panel *jdi = to_jdi_panel(panel);
274
275	if (jdi->enabled)
276		return 0;
277
278	backlight_enable(jdi->backlight);
279
280	jdi->enabled = true;
281
282	return 0;
283}
284
285static const struct drm_display_mode default_mode = {
286		.clock = 155493,
287		.hdisplay = 1200,
288		.hsync_start = 1200 + 48,
289		.hsync_end = 1200 + 48 + 32,
290		.htotal = 1200 + 48 + 32 + 60,
291		.vdisplay = 1920,
292		.vsync_start = 1920 + 3,
293		.vsync_end = 1920 + 3 + 5,
294		.vtotal = 1920 + 3 + 5 + 6,
295		.flags = 0,
296};
297
298static int jdi_panel_get_modes(struct drm_panel *panel,
299			       struct drm_connector *connector)
300{
301	struct drm_display_mode *mode;
302	struct jdi_panel *jdi = to_jdi_panel(panel);
303	struct device *dev = &jdi->dsi->dev;
304
305	mode = drm_mode_duplicate(connector->dev, &default_mode);
306	if (!mode) {
307		dev_err(dev, "failed to add mode %ux%ux@%u\n",
308			default_mode.hdisplay, default_mode.vdisplay,
309			drm_mode_vrefresh(&default_mode));
310		return -ENOMEM;
311	}
312
313	drm_mode_set_name(mode);
314
315	drm_mode_probed_add(connector, mode);
316
317	connector->display_info.width_mm = 95;
318	connector->display_info.height_mm = 151;
319
320	return 1;
321}
322
323static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
324{
325	struct mipi_dsi_device *dsi = bl_get_data(bl);
326	int ret;
327	u16 brightness = bl->props.brightness;
328
329	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
330
331	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
332	if (ret < 0)
333		return ret;
334
335	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
336
337	return brightness & 0xff;
338}
339
340static int dsi_dcs_bl_update_status(struct backlight_device *bl)
341{
342	struct mipi_dsi_device *dsi = bl_get_data(bl);
343	int ret;
344
345	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
346
347	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
348	if (ret < 0)
349		return ret;
350
351	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
352
353	return 0;
354}
355
356static const struct backlight_ops dsi_bl_ops = {
357	.update_status = dsi_dcs_bl_update_status,
358	.get_brightness = dsi_dcs_bl_get_brightness,
359};
360
361static struct backlight_device *
362drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
363{
364	struct device *dev = &dsi->dev;
365	struct backlight_properties props;
366
367	memset(&props, 0, sizeof(props));
368	props.type = BACKLIGHT_RAW;
369	props.brightness = 255;
370	props.max_brightness = 255;
371
372	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
373					      &dsi_bl_ops, &props);
374}
375
376static const struct drm_panel_funcs jdi_panel_funcs = {
377	.disable = jdi_panel_disable,
378	.unprepare = jdi_panel_unprepare,
379	.prepare = jdi_panel_prepare,
380	.enable = jdi_panel_enable,
381	.get_modes = jdi_panel_get_modes,
382};
383
384static const struct of_device_id jdi_of_match[] = {
385	{ .compatible = "jdi,lt070me05000", },
386	{ }
387};
388MODULE_DEVICE_TABLE(of, jdi_of_match);
389
390static int jdi_panel_add(struct jdi_panel *jdi)
391{
392	struct device *dev = &jdi->dsi->dev;
393	int ret;
394	unsigned int i;
395
396	jdi->mode = &default_mode;
397
398	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
399		jdi->supplies[i].supply = regulator_names[i];
400
401	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
402				      jdi->supplies);
403	if (ret < 0)
404		return dev_err_probe(dev, ret,
405				     "failed to init regulator, ret=%d\n", ret);
406
407	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
408	if (IS_ERR(jdi->enable_gpio)) {
409		return dev_err_probe(dev, PTR_ERR(jdi->enable_gpio),
410				     "cannot get enable-gpio %d\n", ret);
411	}
412
413	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
414	if (IS_ERR(jdi->reset_gpio))
415		return dev_err_probe(dev, PTR_ERR(jdi->reset_gpio),
416				     "cannot get reset-gpios %d\n", ret);
417
418	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
419	if (IS_ERR(jdi->dcdc_en_gpio))
420		return dev_err_probe(dev, PTR_ERR(jdi->dcdc_en_gpio),
421				     "cannot get dcdc-en-gpio %d\n", ret);
422
423	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
424	if (IS_ERR(jdi->backlight))
425		return dev_err_probe(dev, PTR_ERR(jdi->backlight),
426				     "failed to register backlight %d\n", ret);
427
428	drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs,
429		       DRM_MODE_CONNECTOR_DSI);
430
431	drm_panel_add(&jdi->base);
432
433	return 0;
434}
435
436static void jdi_panel_del(struct jdi_panel *jdi)
437{
438	if (jdi->base.dev)
439		drm_panel_remove(&jdi->base);
440}
441
442static int jdi_panel_probe(struct mipi_dsi_device *dsi)
443{
444	struct jdi_panel *jdi;
445	int ret;
446
447	dsi->lanes = 4;
448	dsi->format = MIPI_DSI_FMT_RGB888;
449	dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
450			   MIPI_DSI_CLOCK_NON_CONTINUOUS;
451
452	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
453	if (!jdi)
454		return -ENOMEM;
455
456	mipi_dsi_set_drvdata(dsi, jdi);
457
458	jdi->dsi = dsi;
459
460	ret = jdi_panel_add(jdi);
461	if (ret < 0)
462		return ret;
463
464	ret = mipi_dsi_attach(dsi);
465	if (ret < 0) {
466		jdi_panel_del(jdi);
467		return ret;
468	}
469
470	return 0;
471}
472
473static void jdi_panel_remove(struct mipi_dsi_device *dsi)
474{
475	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
476	int ret;
477
478	ret = jdi_panel_disable(&jdi->base);
479	if (ret < 0)
480		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
481
482	ret = mipi_dsi_detach(dsi);
483	if (ret < 0)
484		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
485			ret);
486
487	jdi_panel_del(jdi);
488}
489
490static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
491{
492	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
493
494	jdi_panel_disable(&jdi->base);
495}
496
497static struct mipi_dsi_driver jdi_panel_driver = {
498	.driver = {
499		.name = "panel-jdi-lt070me05000",
500		.of_match_table = jdi_of_match,
501	},
502	.probe = jdi_panel_probe,
503	.remove = jdi_panel_remove,
504	.shutdown = jdi_panel_shutdown,
505};
506module_mipi_dsi_driver(jdi_panel_driver);
507
508MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
509MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
510MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
511MODULE_LICENSE("GPL v2");
512