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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 jdi->backlight->props.power = FB_BLANK_POWERDOWN;
196 backlight_update_status(jdi->backlight);
197
198 jdi->enabled = false;
199
200 return 0;
201}
202
203static int jdi_panel_unprepare(struct drm_panel *panel)
204{
205 struct jdi_panel *jdi = to_jdi_panel(panel);
206 struct device *dev = &jdi->dsi->dev;
207 int ret;
208
209 if (!jdi->prepared)
210 return 0;
211
212 jdi_panel_off(jdi);
213
214 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
215 if (ret < 0)
216 dev_err(dev, "regulator disable failed, %d\n", ret);
217
218 gpiod_set_value(jdi->enable_gpio, 0);
219
220 gpiod_set_value(jdi->reset_gpio, 1);
221
222 gpiod_set_value(jdi->dcdc_en_gpio, 0);
223
224 jdi->prepared = false;
225
226 return 0;
227}
228
229static int jdi_panel_prepare(struct drm_panel *panel)
230{
231 struct jdi_panel *jdi = to_jdi_panel(panel);
232 struct device *dev = &jdi->dsi->dev;
233 int ret;
234
235 if (jdi->prepared)
236 return 0;
237
238 ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
239 if (ret < 0) {
240 dev_err(dev, "regulator enable failed, %d\n", ret);
241 return ret;
242 }
243
244 msleep(20);
245
246 gpiod_set_value(jdi->dcdc_en_gpio, 1);
247 usleep_range(10, 20);
248
249 gpiod_set_value(jdi->reset_gpio, 0);
250 usleep_range(10, 20);
251
252 gpiod_set_value(jdi->enable_gpio, 1);
253 usleep_range(10, 20);
254
255 ret = jdi_panel_init(jdi);
256 if (ret < 0) {
257 dev_err(dev, "failed to init panel: %d\n", ret);
258 goto poweroff;
259 }
260
261 ret = jdi_panel_on(jdi);
262 if (ret < 0) {
263 dev_err(dev, "failed to set panel on: %d\n", ret);
264 goto poweroff;
265 }
266
267 jdi->prepared = true;
268
269 return 0;
270
271poweroff:
272 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
273 if (ret < 0)
274 dev_err(dev, "regulator disable failed, %d\n", ret);
275
276 gpiod_set_value(jdi->enable_gpio, 0);
277
278 gpiod_set_value(jdi->reset_gpio, 1);
279
280 gpiod_set_value(jdi->dcdc_en_gpio, 0);
281
282 return ret;
283}
284
285static int jdi_panel_enable(struct drm_panel *panel)
286{
287 struct jdi_panel *jdi = to_jdi_panel(panel);
288
289 if (jdi->enabled)
290 return 0;
291
292 jdi->backlight->props.power = FB_BLANK_UNBLANK;
293 backlight_update_status(jdi->backlight);
294
295 jdi->enabled = true;
296
297 return 0;
298}
299
300static const struct drm_display_mode default_mode = {
301 .clock = 155493,
302 .hdisplay = 1200,
303 .hsync_start = 1200 + 48,
304 .hsync_end = 1200 + 48 + 32,
305 .htotal = 1200 + 48 + 32 + 60,
306 .vdisplay = 1920,
307 .vsync_start = 1920 + 3,
308 .vsync_end = 1920 + 3 + 5,
309 .vtotal = 1920 + 3 + 5 + 6,
310 .vrefresh = 60,
311 .flags = 0,
312};
313
314static int jdi_panel_get_modes(struct drm_panel *panel)
315{
316 struct drm_display_mode *mode;
317 struct jdi_panel *jdi = to_jdi_panel(panel);
318 struct device *dev = &jdi->dsi->dev;
319
320 mode = drm_mode_duplicate(panel->drm, &default_mode);
321 if (!mode) {
322 dev_err(dev, "failed to add mode %ux%ux@%u\n",
323 default_mode.hdisplay, default_mode.vdisplay,
324 default_mode.vrefresh);
325 return -ENOMEM;
326 }
327
328 drm_mode_set_name(mode);
329
330 drm_mode_probed_add(panel->connector, mode);
331
332 panel->connector->display_info.width_mm = 95;
333 panel->connector->display_info.height_mm = 151;
334
335 return 1;
336}
337
338static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
339{
340 struct mipi_dsi_device *dsi = bl_get_data(bl);
341 int ret;
342 u16 brightness = bl->props.brightness;
343
344 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
345
346 ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
347 if (ret < 0)
348 return ret;
349
350 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
351
352 return brightness & 0xff;
353}
354
355static int dsi_dcs_bl_update_status(struct backlight_device *bl)
356{
357 struct mipi_dsi_device *dsi = bl_get_data(bl);
358 int ret;
359
360 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
361
362 ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
363 if (ret < 0)
364 return ret;
365
366 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
367
368 return 0;
369}
370
371static const struct backlight_ops dsi_bl_ops = {
372 .update_status = dsi_dcs_bl_update_status,
373 .get_brightness = dsi_dcs_bl_get_brightness,
374};
375
376static struct backlight_device *
377drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
378{
379 struct device *dev = &dsi->dev;
380 struct backlight_properties props;
381
382 memset(&props, 0, sizeof(props));
383 props.type = BACKLIGHT_RAW;
384 props.brightness = 255;
385 props.max_brightness = 255;
386
387 return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
388 &dsi_bl_ops, &props);
389}
390
391static const struct drm_panel_funcs jdi_panel_funcs = {
392 .disable = jdi_panel_disable,
393 .unprepare = jdi_panel_unprepare,
394 .prepare = jdi_panel_prepare,
395 .enable = jdi_panel_enable,
396 .get_modes = jdi_panel_get_modes,
397};
398
399static const struct of_device_id jdi_of_match[] = {
400 { .compatible = "jdi,lt070me05000", },
401 { }
402};
403MODULE_DEVICE_TABLE(of, jdi_of_match);
404
405static int jdi_panel_add(struct jdi_panel *jdi)
406{
407 struct device *dev = &jdi->dsi->dev;
408 int ret;
409 unsigned int i;
410
411 jdi->mode = &default_mode;
412
413 for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
414 jdi->supplies[i].supply = regulator_names[i];
415
416 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
417 jdi->supplies);
418 if (ret < 0) {
419 dev_err(dev, "failed to init regulator, ret=%d\n", ret);
420 return ret;
421 }
422
423 jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
424 if (IS_ERR(jdi->enable_gpio)) {
425 ret = PTR_ERR(jdi->enable_gpio);
426 dev_err(dev, "cannot get enable-gpio %d\n", ret);
427 return ret;
428 }
429
430 jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
431 if (IS_ERR(jdi->reset_gpio)) {
432 ret = PTR_ERR(jdi->reset_gpio);
433 dev_err(dev, "cannot get reset-gpios %d\n", ret);
434 return ret;
435 }
436
437 jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
438 if (IS_ERR(jdi->dcdc_en_gpio)) {
439 ret = PTR_ERR(jdi->dcdc_en_gpio);
440 dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
441 return ret;
442 }
443
444 jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
445 if (IS_ERR(jdi->backlight)) {
446 ret = PTR_ERR(jdi->backlight);
447 dev_err(dev, "failed to register backlight %d\n", ret);
448 return ret;
449 }
450
451 drm_panel_init(&jdi->base);
452 jdi->base.funcs = &jdi_panel_funcs;
453 jdi->base.dev = &jdi->dsi->dev;
454
455 ret = drm_panel_add(&jdi->base);
456
457 return ret;
458}
459
460static void jdi_panel_del(struct jdi_panel *jdi)
461{
462 if (jdi->base.dev)
463 drm_panel_remove(&jdi->base);
464}
465
466static int jdi_panel_probe(struct mipi_dsi_device *dsi)
467{
468 struct jdi_panel *jdi;
469 int ret;
470
471 dsi->lanes = 4;
472 dsi->format = MIPI_DSI_FMT_RGB888;
473 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
474 MIPI_DSI_CLOCK_NON_CONTINUOUS;
475
476 jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
477 if (!jdi)
478 return -ENOMEM;
479
480 mipi_dsi_set_drvdata(dsi, jdi);
481
482 jdi->dsi = dsi;
483
484 ret = jdi_panel_add(jdi);
485 if (ret < 0)
486 return ret;
487
488 return mipi_dsi_attach(dsi);
489}
490
491static int jdi_panel_remove(struct mipi_dsi_device *dsi)
492{
493 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
494 int ret;
495
496 ret = jdi_panel_disable(&jdi->base);
497 if (ret < 0)
498 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
499
500 ret = mipi_dsi_detach(dsi);
501 if (ret < 0)
502 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
503 ret);
504
505 drm_panel_detach(&jdi->base);
506 jdi_panel_del(jdi);
507
508 return 0;
509}
510
511static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
512{
513 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
514
515 jdi_panel_disable(&jdi->base);
516}
517
518static struct mipi_dsi_driver jdi_panel_driver = {
519 .driver = {
520 .name = "panel-jdi-lt070me05000",
521 .of_match_table = jdi_of_match,
522 },
523 .probe = jdi_panel_probe,
524 .remove = jdi_panel_remove,
525 .shutdown = jdi_panel_shutdown,
526};
527module_mipi_dsi_driver(jdi_panel_driver);
528
529MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
530MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
531MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
532MODULE_LICENSE("GPL v2");