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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
89
90
91
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
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
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 return mipi_dsi_attach(dsi);
477}
478
479static int jdi_panel_remove(struct mipi_dsi_device *dsi)
480{
481 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
482 int ret;
483
484 ret = jdi_panel_disable(&jdi->base);
485 if (ret < 0)
486 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
487
488 ret = mipi_dsi_detach(dsi);
489 if (ret < 0)
490 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
491 ret);
492
493 jdi_panel_del(jdi);
494
495 return 0;
496}
497
498static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
499{
500 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
501
502 jdi_panel_disable(&jdi->base);
503}
504
505static struct mipi_dsi_driver jdi_panel_driver = {
506 .driver = {
507 .name = "panel-jdi-lt070me05000",
508 .of_match_table = jdi_of_match,
509 },
510 .probe = jdi_panel_probe,
511 .remove = jdi_panel_remove,
512 .shutdown = jdi_panel_shutdown,
513};
514module_mipi_dsi_driver(jdi_panel_driver);
515
516MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
517MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
518MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
519MODULE_LICENSE("GPL v2");
520
