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 * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
 10 * JDI model LT070ME05000, and its data sheet is at:
 11 * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
 12 */
 13
 14#include <linux/backlight.h>
 15#include <linux/delay.h>
 16#include <linux/gpio/consumer.h>
 17#include <linux/module.h>
 18#include <linux/of.h>
 19#include <linux/regulator/consumer.h>
 20
 21#include <video/mipi_display.h>
 22
 23#include <drm/drm_crtc.h>
 24#include <drm/drm_mipi_dsi.h>
 25#include <drm/drm_modes.h>
 26#include <drm/drm_panel.h>
 27
 28static const char * const regulator_names[] = {
 29	"vddp",
 30	"iovcc"
 31};
 32
 33struct jdi_panel {
 34	struct drm_panel base;
 35	struct mipi_dsi_device *dsi;
 36
 37	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
 38
 39	struct gpio_desc *enable_gpio;
 40	struct gpio_desc *reset_gpio;
 41	struct gpio_desc *dcdc_en_gpio;
 42	struct backlight_device *backlight;
 43
 44	bool prepared;
 45	bool enabled;
 46
 47	const struct drm_display_mode *mode;
 48};
 49
 50static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
 51{
 52	return container_of(panel, struct jdi_panel, base);
 53}
 54
 55static int jdi_panel_init(struct jdi_panel *jdi)
 56{
 57	struct mipi_dsi_device *dsi = jdi->dsi;
 58	struct device *dev = &jdi->dsi->dev;
 59	int ret;
 60
 61	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 62
 63	ret = mipi_dsi_dcs_soft_reset(dsi);
 64	if (ret < 0)
 65		return ret;
 66
 67	usleep_range(10000, 20000);
 68
 69	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
 70	if (ret < 0) {
 71		dev_err(dev, "failed to set pixel format: %d\n", ret);
 72		return ret;
 73	}
 74
 75	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
 76	if (ret < 0) {
 77		dev_err(dev, "failed to set column address: %d\n", ret);
 78		return ret;
 79	}
 80
 81	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
 82	if (ret < 0) {
 83		dev_err(dev, "failed to set page address: %d\n", ret);
 84		return ret;
 85	}
 86
 87	/*
 88	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
 89	 *                  are active
 90	 * BIT(3) BL = 1    Backlight Control On
 91	 * BIT(2) DD = 0    Display Dimming is Off
 92	 */
 93	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 94				 (u8[]){ 0x24 }, 1);
 95	if (ret < 0) {
 96		dev_err(dev, "failed to write control display: %d\n", ret);
 97		return ret;
 98	}
 99
100	/* CABC off */
101	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
102				 (u8[]){ 0x00 }, 1);
103	if (ret < 0) {
104		dev_err(dev, "failed to set cabc off: %d\n", ret);
105		return ret;
106	}
107
108	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
109	if (ret < 0) {
110		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
111		return ret;
112	}
113
114	msleep(120);
115
116	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
117	if (ret < 0) {
118		dev_err(dev, "failed to set mcap: %d\n", ret);
119		return ret;
120	}
121
122	mdelay(10);
123
124	/* Interface setting, video mode */
125	ret = mipi_dsi_generic_write(dsi, (u8[])
126				     {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
127	if (ret < 0) {
128		dev_err(dev, "failed to set display interface setting: %d\n"
129			, ret);
130		return ret;
131	}
132
133	mdelay(20);
134
135	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
136	if (ret < 0) {
137		dev_err(dev, "failed to set default values for mcap: %d\n"
138			, ret);
139		return ret;
140	}
141
142	return 0;
143}
144
145static int jdi_panel_on(struct jdi_panel *jdi)
146{
147	struct mipi_dsi_device *dsi = jdi->dsi;
148	struct device *dev = &jdi->dsi->dev;
149	int ret;
150
151	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
152
153	ret = mipi_dsi_dcs_set_display_on(dsi);
154	if (ret < 0)
155		dev_err(dev, "failed to set display on: %d\n", ret);
156
157	return ret;
158}
159
160static void jdi_panel_off(struct jdi_panel *jdi)
161{
162	struct mipi_dsi_device *dsi = jdi->dsi;
163	struct device *dev = &jdi->dsi->dev;
164	int ret;
165
166	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
167
168	ret = mipi_dsi_dcs_set_display_off(dsi);
169	if (ret < 0)
170		dev_err(dev, "failed to set display off: %d\n", ret);
171
172	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
173	if (ret < 0)
174		dev_err(dev, "failed to enter sleep mode: %d\n", ret);
175
176	msleep(100);
177}
178
179static int jdi_panel_disable(struct drm_panel *panel)
180{
181	struct jdi_panel *jdi = to_jdi_panel(panel);
182
183	if (!jdi->enabled)
184		return 0;
185
186	backlight_disable(jdi->backlight);
187
188	jdi->enabled = false;
189
190	return 0;
191}
192
193static int jdi_panel_unprepare(struct drm_panel *panel)
194{
195	struct jdi_panel *jdi = to_jdi_panel(panel);
196	struct device *dev = &jdi->dsi->dev;
197	int ret;
198
199	if (!jdi->prepared)
200		return 0;
201
202	jdi_panel_off(jdi);
203
204	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
205	if (ret < 0)
206		dev_err(dev, "regulator disable failed, %d\n", ret);
207
208	gpiod_set_value(jdi->enable_gpio, 0);
209
210	gpiod_set_value(jdi->reset_gpio, 1);
211
212	gpiod_set_value(jdi->dcdc_en_gpio, 0);
213
214	jdi->prepared = false;
215
216	return 0;
217}
218
219static int jdi_panel_prepare(struct drm_panel *panel)
220{
221	struct jdi_panel *jdi = to_jdi_panel(panel);
222	struct device *dev = &jdi->dsi->dev;
223	int ret;
224
225	if (jdi->prepared)
226		return 0;
227
228	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
229	if (ret < 0) {
230		dev_err(dev, "regulator enable failed, %d\n", ret);
231		return ret;
232	}
233
234	msleep(20);
235
236	gpiod_set_value(jdi->dcdc_en_gpio, 1);
237	usleep_range(10, 20);
238
239	gpiod_set_value(jdi->reset_gpio, 0);
240	usleep_range(10, 20);
241
242	gpiod_set_value(jdi->enable_gpio, 1);
243	usleep_range(10, 20);
244
245	ret = jdi_panel_init(jdi);
246	if (ret < 0) {
247		dev_err(dev, "failed to init panel: %d\n", ret);
248		goto poweroff;
249	}
250
251	ret = jdi_panel_on(jdi);
252	if (ret < 0) {
253		dev_err(dev, "failed to set panel on: %d\n", ret);
254		goto poweroff;
255	}
256
257	jdi->prepared = true;
258
259	return 0;
260
261poweroff:
262	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
263	if (ret < 0)
264		dev_err(dev, "regulator disable failed, %d\n", ret);
265
266	gpiod_set_value(jdi->enable_gpio, 0);
267
268	gpiod_set_value(jdi->reset_gpio, 1);
269
270	gpiod_set_value(jdi->dcdc_en_gpio, 0);
271
272	return ret;
273}
274
275static int jdi_panel_enable(struct drm_panel *panel)
276{
277	struct jdi_panel *jdi = to_jdi_panel(panel);
278
279	if (jdi->enabled)
280		return 0;
281
282	backlight_enable(jdi->backlight);
283
284	jdi->enabled = true;
285
286	return 0;
287}
288
289static const struct drm_display_mode default_mode = {
290		.clock = 155493,
291		.hdisplay = 1200,
292		.hsync_start = 1200 + 48,
293		.hsync_end = 1200 + 48 + 32,
294		.htotal = 1200 + 48 + 32 + 60,
295		.vdisplay = 1920,
296		.vsync_start = 1920 + 3,
297		.vsync_end = 1920 + 3 + 5,
298		.vtotal = 1920 + 3 + 5 + 6,
299		.flags = 0,
300};
301
302static int jdi_panel_get_modes(struct drm_panel *panel,
303			       struct drm_connector *connector)
304{
305	struct drm_display_mode *mode;
306	struct jdi_panel *jdi = to_jdi_panel(panel);
307	struct device *dev = &jdi->dsi->dev;
308
309	mode = drm_mode_duplicate(connector->dev, &default_mode);
310	if (!mode) {
311		dev_err(dev, "failed to add mode %ux%ux@%u\n",
312			default_mode.hdisplay, default_mode.vdisplay,
313			drm_mode_vrefresh(&default_mode));
314		return -ENOMEM;
315	}
316
317	drm_mode_set_name(mode);
318
319	drm_mode_probed_add(connector, mode);
320
321	connector->display_info.width_mm = 95;
322	connector->display_info.height_mm = 151;
323
324	return 1;
325}
326
327static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
328{
329	struct mipi_dsi_device *dsi = bl_get_data(bl);
330	int ret;
331	u16 brightness = bl->props.brightness;
332
333	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
334
335	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
336	if (ret < 0)
337		return ret;
338
339	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
340
341	return brightness & 0xff;
342}
343
344static int dsi_dcs_bl_update_status(struct backlight_device *bl)
345{
346	struct mipi_dsi_device *dsi = bl_get_data(bl);
347	int ret;
348
349	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
350
351	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
352	if (ret < 0)
353		return ret;
354
355	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
356
357	return 0;
358}
359
360static const struct backlight_ops dsi_bl_ops = {
361	.update_status = dsi_dcs_bl_update_status,
362	.get_brightness = dsi_dcs_bl_get_brightness,
363};
364
365static struct backlight_device *
366drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
367{
368	struct device *dev = &dsi->dev;
369	struct backlight_properties props;
370
371	memset(&props, 0, sizeof(props));
372	props.type = BACKLIGHT_RAW;
373	props.brightness = 255;
374	props.max_brightness = 255;
375
376	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
377					      &dsi_bl_ops, &props);
378}
379
380static const struct drm_panel_funcs jdi_panel_funcs = {
381	.disable = jdi_panel_disable,
382	.unprepare = jdi_panel_unprepare,
383	.prepare = jdi_panel_prepare,
384	.enable = jdi_panel_enable,
385	.get_modes = jdi_panel_get_modes,
386};
387
388static const struct of_device_id jdi_of_match[] = {
389	{ .compatible = "jdi,lt070me05000", },
390	{ }
391};
392MODULE_DEVICE_TABLE(of, jdi_of_match);
393
394static int jdi_panel_add(struct jdi_panel *jdi)
395{
396	struct device *dev = &jdi->dsi->dev;
397	int ret;
398	unsigned int i;
399
400	jdi->mode = &default_mode;
401
402	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
403		jdi->supplies[i].supply = regulator_names[i];
404
405	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
406				      jdi->supplies);
407	if (ret < 0) {
408		dev_err(dev, "failed to init regulator, ret=%d\n", ret);
409		return ret;
410	}
411
412	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
413	if (IS_ERR(jdi->enable_gpio)) {
414		ret = PTR_ERR(jdi->enable_gpio);
415		dev_err(dev, "cannot get enable-gpio %d\n", ret);
416		return ret;
417	}
418
419	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
420	if (IS_ERR(jdi->reset_gpio)) {
421		ret = PTR_ERR(jdi->reset_gpio);
422		dev_err(dev, "cannot get reset-gpios %d\n", ret);
423		return ret;
424	}
425
426	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
427	if (IS_ERR(jdi->dcdc_en_gpio)) {
428		ret = PTR_ERR(jdi->dcdc_en_gpio);
429		dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
430		return ret;
431	}
432
433	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
434	if (IS_ERR(jdi->backlight)) {
435		ret = PTR_ERR(jdi->backlight);
436		dev_err(dev, "failed to register backlight %d\n", ret);
437		return ret;
438	}
439
440	drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs,
441		       DRM_MODE_CONNECTOR_DSI);
442
443	drm_panel_add(&jdi->base);
444
445	return 0;
446}
447
448static void jdi_panel_del(struct jdi_panel *jdi)
449{
450	if (jdi->base.dev)
451		drm_panel_remove(&jdi->base);
452}
453
454static int jdi_panel_probe(struct mipi_dsi_device *dsi)
455{
456	struct jdi_panel *jdi;
457	int ret;
458
459	dsi->lanes = 4;
460	dsi->format = MIPI_DSI_FMT_RGB888;
461	dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
462			   MIPI_DSI_CLOCK_NON_CONTINUOUS;
463
464	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
465	if (!jdi)
466		return -ENOMEM;
467
468	mipi_dsi_set_drvdata(dsi, jdi);
469
470	jdi->dsi = dsi;
471
472	ret = jdi_panel_add(jdi);
473	if (ret < 0)
474		return ret;
475
476	ret = mipi_dsi_attach(dsi);
477	if (ret < 0) {
478		jdi_panel_del(jdi);
479		return ret;
480	}
481
482	return 0;
483}
484
485static void jdi_panel_remove(struct mipi_dsi_device *dsi)
486{
487	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
488	int ret;
489
490	ret = jdi_panel_disable(&jdi->base);
491	if (ret < 0)
492		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
493
494	ret = mipi_dsi_detach(dsi);
495	if (ret < 0)
496		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
497			ret);
498
499	jdi_panel_del(jdi);
500}
501
502static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
503{
504	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
505
506	jdi_panel_disable(&jdi->base);
507}
508
509static struct mipi_dsi_driver jdi_panel_driver = {
510	.driver = {
511		.name = "panel-jdi-lt070me05000",
512		.of_match_table = jdi_of_match,
513	},
514	.probe = jdi_panel_probe,
515	.remove = jdi_panel_remove,
516	.shutdown = jdi_panel_shutdown,
517};
518module_mipi_dsi_driver(jdi_panel_driver);
519
520MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
521MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
522MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
523MODULE_LICENSE("GPL v2");