1/*
  2 * Copyright (C) 2016 InforceComputing
  3 * Author: Vinay Simha BN <simhavcs@gmail.com>
  4 *
  5 * Copyright (C) 2016 Linaro Ltd
  6 * Author: Sumit Semwal <sumit.semwal@linaro.org>
  7 *
  8 * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
  9 * JDI model LT070ME05000, and its data sheet is at:
 10 * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
 11 *
 12 * This program is free software; you can redistribute it and/or modify it
 13 * under the terms of the GNU General Public License version 2 as published by
 14 * the Free Software Foundation.
 15 *
 16 * This program is distributed in the hope that it will be useful, but WITHOUT
 17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 18 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 19 * more details.
 20 *
 21 * You should have received a copy of the GNU General Public License along with
 22 * this program.  If not, see <http://www.gnu.org/licenses/>.
 23 */
 24#include <linux/backlight.h>
 25#include <linux/gpio/consumer.h>
 26#include <linux/module.h>
 27#include <linux/of.h>
 28#include <linux/regulator/consumer.h>
 29
 30#include <drm/drmP.h>
 31#include <drm/drm_crtc.h>
 32#include <drm/drm_mipi_dsi.h>
 33#include <drm/drm_panel.h>
 34
 35#include <video/mipi_display.h>
 36
 37static const char * const regulator_names[] = {
 38	"vddp",
 39	"iovcc"
 40};
 41
 42struct jdi_panel {
 43	struct drm_panel base;
 44	struct mipi_dsi_device *dsi;
 45
 46	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
 47
 48	struct gpio_desc *enable_gpio;
 49	struct gpio_desc *reset_gpio;
 50	struct gpio_desc *dcdc_en_gpio;
 51	struct backlight_device *backlight;
 52
 53	bool prepared;
 54	bool enabled;
 55
 56	const struct drm_display_mode *mode;
 57};
 58
 59static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
 60{
 61	return container_of(panel, struct jdi_panel, base);
 62}
 63
 64static int jdi_panel_init(struct jdi_panel *jdi)
 65{
 66	struct mipi_dsi_device *dsi = jdi->dsi;
 67	struct device *dev = &jdi->dsi->dev;
 68	int ret;
 69
 70	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 71
 72	ret = mipi_dsi_dcs_soft_reset(dsi);
 73	if (ret < 0)
 74		return ret;
 75
 76	usleep_range(10000, 20000);
 77
 78	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
 79	if (ret < 0) {
 80		dev_err(dev, "failed to set pixel format: %d\n", ret);
 81		return ret;
 82	}
 83
 84	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
 85	if (ret < 0) {
 86		dev_err(dev, "failed to set column address: %d\n", ret);
 87		return ret;
 88	}
 89
 90	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
 91	if (ret < 0) {
 92		dev_err(dev, "failed to set page address: %d\n", ret);
 93		return ret;
 94	}
 95
 96	/*
 97	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
 98	 *                  are active
 99	 * BIT(3) BL = 1    Backlight Control On
100	 * BIT(2) DD = 0    Display Dimming is Off
101	 */
102	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
103				 (u8[]){ 0x24 }, 1);
104	if (ret < 0) {
105		dev_err(dev, "failed to write control display: %d\n", ret);
106		return ret;
107	}
108
109	/* CABC off */
110	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
111				 (u8[]){ 0x00 }, 1);
112	if (ret < 0) {
113		dev_err(dev, "failed to set cabc off: %d\n", ret);
114		return ret;
115	}
116
117	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
118	if (ret < 0) {
119		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
120		return ret;
121	}
122
123	msleep(120);
124
125	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
126	if (ret < 0) {
127		dev_err(dev, "failed to set mcap: %d\n", ret);
128		return ret;
129	}
130
131	mdelay(10);
132
133	/* Interface setting, video mode */
134	ret = mipi_dsi_generic_write(dsi, (u8[])
135				     {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
136	if (ret < 0) {
137		dev_err(dev, "failed to set display interface setting: %d\n"
138			, ret);
139		return ret;
140	}
141
142	mdelay(20);
143
144	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
145	if (ret < 0) {
146		dev_err(dev, "failed to set default values for mcap: %d\n"
147			, ret);
148		return ret;
149	}
150
151	return 0;
152}
153
154static int jdi_panel_on(struct jdi_panel *jdi)
155{
156	struct mipi_dsi_device *dsi = jdi->dsi;
157	struct device *dev = &jdi->dsi->dev;
158	int ret;
159
160	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
161
162	ret = mipi_dsi_dcs_set_display_on(dsi);
163	if (ret < 0)
164		dev_err(dev, "failed to set display on: %d\n", ret);
165
166	return ret;
167}
168
169static void jdi_panel_off(struct jdi_panel *jdi)
170{
171	struct mipi_dsi_device *dsi = jdi->dsi;
172	struct device *dev = &jdi->dsi->dev;
173	int ret;
174
175	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
176
177	ret = mipi_dsi_dcs_set_display_off(dsi);
178	if (ret < 0)
179		dev_err(dev, "failed to set display off: %d\n", ret);
180
181	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
182	if (ret < 0)
183		dev_err(dev, "failed to enter sleep mode: %d\n", ret);
184
185	msleep(100);
186}
187
188static int jdi_panel_disable(struct drm_panel *panel)
189{
190	struct jdi_panel *jdi = to_jdi_panel(panel);
191
192	if (!jdi->enabled)
193		return 0;
194
195	backlight_disable(jdi->backlight);
196
197	jdi->enabled = false;
198
199	return 0;
200}
201
202static int jdi_panel_unprepare(struct drm_panel *panel)
203{
204	struct jdi_panel *jdi = to_jdi_panel(panel);
205	struct device *dev = &jdi->dsi->dev;
206	int ret;
207
208	if (!jdi->prepared)
209		return 0;
210
211	jdi_panel_off(jdi);
212
213	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
214	if (ret < 0)
215		dev_err(dev, "regulator disable failed, %d\n", ret);
216
217	gpiod_set_value(jdi->enable_gpio, 0);
218
219	gpiod_set_value(jdi->reset_gpio, 1);
220
221	gpiod_set_value(jdi->dcdc_en_gpio, 0);
222
223	jdi->prepared = false;
224
225	return 0;
226}
227
228static int jdi_panel_prepare(struct drm_panel *panel)
229{
230	struct jdi_panel *jdi = to_jdi_panel(panel);
231	struct device *dev = &jdi->dsi->dev;
232	int ret;
233
234	if (jdi->prepared)
235		return 0;
236
237	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
238	if (ret < 0) {
239		dev_err(dev, "regulator enable failed, %d\n", ret);
240		return ret;
241	}
242
243	msleep(20);
244
245	gpiod_set_value(jdi->dcdc_en_gpio, 1);
246	usleep_range(10, 20);
247
248	gpiod_set_value(jdi->reset_gpio, 0);
249	usleep_range(10, 20);
250
251	gpiod_set_value(jdi->enable_gpio, 1);
252	usleep_range(10, 20);
253
254	ret = jdi_panel_init(jdi);
255	if (ret < 0) {
256		dev_err(dev, "failed to init panel: %d\n", ret);
257		goto poweroff;
258	}
259
260	ret = jdi_panel_on(jdi);
261	if (ret < 0) {
262		dev_err(dev, "failed to set panel on: %d\n", ret);
263		goto poweroff;
264	}
265
266	jdi->prepared = true;
267
268	return 0;
269
270poweroff:
271	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
272	if (ret < 0)
273		dev_err(dev, "regulator disable failed, %d\n", ret);
274
275	gpiod_set_value(jdi->enable_gpio, 0);
276
277	gpiod_set_value(jdi->reset_gpio, 1);
278
279	gpiod_set_value(jdi->dcdc_en_gpio, 0);
280
281	return ret;
282}
283
284static int jdi_panel_enable(struct drm_panel *panel)
285{
286	struct jdi_panel *jdi = to_jdi_panel(panel);
287
288	if (jdi->enabled)
289		return 0;
290
291	backlight_enable(jdi->backlight);
292
293	jdi->enabled = true;
294
295	return 0;
296}
297
298static const struct drm_display_mode default_mode = {
299		.clock = 155493,
300		.hdisplay = 1200,
301		.hsync_start = 1200 + 48,
302		.hsync_end = 1200 + 48 + 32,
303		.htotal = 1200 + 48 + 32 + 60,
304		.vdisplay = 1920,
305		.vsync_start = 1920 + 3,
306		.vsync_end = 1920 + 3 + 5,
307		.vtotal = 1920 + 3 + 5 + 6,
308		.vrefresh = 60,
309		.flags = 0,
310};
311
312static int jdi_panel_get_modes(struct drm_panel *panel)
313{
314	struct drm_display_mode *mode;
315	struct jdi_panel *jdi = to_jdi_panel(panel);
316	struct device *dev = &jdi->dsi->dev;
317
318	mode = drm_mode_duplicate(panel->drm, &default_mode);
319	if (!mode) {
320		dev_err(dev, "failed to add mode %ux%ux@%u\n",
321			default_mode.hdisplay, default_mode.vdisplay,
322			default_mode.vrefresh);
323		return -ENOMEM;
324	}
325
326	drm_mode_set_name(mode);
327
328	drm_mode_probed_add(panel->connector, mode);
329
330	panel->connector->display_info.width_mm = 95;
331	panel->connector->display_info.height_mm = 151;
332
333	return 1;
334}
335
336static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
337{
338	struct mipi_dsi_device *dsi = bl_get_data(bl);
339	int ret;
340	u16 brightness = bl->props.brightness;
341
342	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
343
344	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
345	if (ret < 0)
346		return ret;
347
348	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
349
350	return brightness & 0xff;
351}
352
353static int dsi_dcs_bl_update_status(struct backlight_device *bl)
354{
355	struct mipi_dsi_device *dsi = bl_get_data(bl);
356	int ret;
357
358	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
359
360	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
361	if (ret < 0)
362		return ret;
363
364	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
365
366	return 0;
367}
368
369static const struct backlight_ops dsi_bl_ops = {
370	.update_status = dsi_dcs_bl_update_status,
371	.get_brightness = dsi_dcs_bl_get_brightness,
372};
373
374static struct backlight_device *
375drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
376{
377	struct device *dev = &dsi->dev;
378	struct backlight_properties props;
379
380	memset(&props, 0, sizeof(props));
381	props.type = BACKLIGHT_RAW;
382	props.brightness = 255;
383	props.max_brightness = 255;
384
385	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
386					      &dsi_bl_ops, &props);
387}
388
389static const struct drm_panel_funcs jdi_panel_funcs = {
390	.disable = jdi_panel_disable,
391	.unprepare = jdi_panel_unprepare,
392	.prepare = jdi_panel_prepare,
393	.enable = jdi_panel_enable,
394	.get_modes = jdi_panel_get_modes,
395};
396
397static const struct of_device_id jdi_of_match[] = {
398	{ .compatible = "jdi,lt070me05000", },
399	{ }
400};
401MODULE_DEVICE_TABLE(of, jdi_of_match);
402
403static int jdi_panel_add(struct jdi_panel *jdi)
404{
405	struct device *dev = &jdi->dsi->dev;
406	int ret;
407	unsigned int i;
408
409	jdi->mode = &default_mode;
410
411	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
412		jdi->supplies[i].supply = regulator_names[i];
413
414	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
415				      jdi->supplies);
416	if (ret < 0) {
417		dev_err(dev, "failed to init regulator, ret=%d\n", ret);
418		return ret;
419	}
420
421	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
422	if (IS_ERR(jdi->enable_gpio)) {
423		ret = PTR_ERR(jdi->enable_gpio);
424		dev_err(dev, "cannot get enable-gpio %d\n", ret);
425		return ret;
426	}
427
428	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
429	if (IS_ERR(jdi->reset_gpio)) {
430		ret = PTR_ERR(jdi->reset_gpio);
431		dev_err(dev, "cannot get reset-gpios %d\n", ret);
432		return ret;
433	}
434
435	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
436	if (IS_ERR(jdi->dcdc_en_gpio)) {
437		ret = PTR_ERR(jdi->dcdc_en_gpio);
438		dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
439		return ret;
440	}
441
442	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
443	if (IS_ERR(jdi->backlight)) {
444		ret = PTR_ERR(jdi->backlight);
445		dev_err(dev, "failed to register backlight %d\n", ret);
446		return ret;
447	}
448
449	drm_panel_init(&jdi->base);
450	jdi->base.funcs = &jdi_panel_funcs;
451	jdi->base.dev = &jdi->dsi->dev;
452
453	ret = drm_panel_add(&jdi->base);
454
455	return ret;
456}
457
458static void jdi_panel_del(struct jdi_panel *jdi)
459{
460	if (jdi->base.dev)
461		drm_panel_remove(&jdi->base);
462}
463
464static int jdi_panel_probe(struct mipi_dsi_device *dsi)
465{
466	struct jdi_panel *jdi;
467	int ret;
468
469	dsi->lanes = 4;
470	dsi->format = MIPI_DSI_FMT_RGB888;
471	dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
472			   MIPI_DSI_CLOCK_NON_CONTINUOUS;
473
474	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
475	if (!jdi)
476		return -ENOMEM;
477
478	mipi_dsi_set_drvdata(dsi, jdi);
479
480	jdi->dsi = dsi;
481
482	ret = jdi_panel_add(jdi);
483	if (ret < 0)
484		return ret;
485
486	return mipi_dsi_attach(dsi);
487}
488
489static int jdi_panel_remove(struct mipi_dsi_device *dsi)
490{
491	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
492	int ret;
493
494	ret = jdi_panel_disable(&jdi->base);
495	if (ret < 0)
496		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
497
498	ret = mipi_dsi_detach(dsi);
499	if (ret < 0)
500		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
501			ret);
502
503	drm_panel_detach(&jdi->base);
504	jdi_panel_del(jdi);
505
506	return 0;
507}
508
509static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
510{
511	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
512
513	jdi_panel_disable(&jdi->base);
514}
515
516static struct mipi_dsi_driver jdi_panel_driver = {
517	.driver = {
518		.name = "panel-jdi-lt070me05000",
519		.of_match_table = jdi_of_match,
520	},
521	.probe = jdi_panel_probe,
522	.remove = jdi_panel_remove,
523	.shutdown = jdi_panel_shutdown,
524};
525module_mipi_dsi_driver(jdi_panel_driver);
526
527MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
528MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
529MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
530MODULE_LICENSE("GPL v2");