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