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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
98
99
100
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
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
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");
531
