1/*
  2 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License as published by
  6 * the Free Software Foundation; either version 2 of the License, or
  7 * (at your option) any later version.
  8 */
  9
 10#include <linux/backlight.h>
 11#include <linux/gpio/consumer.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/regulator/consumer.h>
 15
 16#include <drm/drmP.h>
 17#include <drm/drm_crtc.h>
 18#include <drm/drm_mipi_dsi.h>
 19#include <drm/drm_panel.h>
 20
 21#include <video/mipi_display.h>
 22
 23struct innolux_panel {
 24	struct drm_panel base;
 25	struct mipi_dsi_device *link;
 26
 27	struct backlight_device *backlight;
 28	struct regulator *supply;
 29	struct gpio_desc *enable_gpio;
 30
 31	bool prepared;
 32	bool enabled;
 33};
 34
 35static inline struct innolux_panel *to_innolux_panel(struct drm_panel *panel)
 36{
 37	return container_of(panel, struct innolux_panel, base);
 38}
 39
 40static int innolux_panel_disable(struct drm_panel *panel)
 41{
 42	struct innolux_panel *innolux = to_innolux_panel(panel);
 43	int err;
 44
 45	if (!innolux->enabled)
 46		return 0;
 47
 48	backlight_disable(innolux->backlight);
 49
 50	err = mipi_dsi_dcs_set_display_off(innolux->link);
 51	if (err < 0)
 52		DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
 53			      err);
 54
 55	innolux->enabled = false;
 56
 57	return 0;
 58}
 59
 60static int innolux_panel_unprepare(struct drm_panel *panel)
 61{
 62	struct innolux_panel *innolux = to_innolux_panel(panel);
 63	int err;
 64
 65	if (!innolux->prepared)
 66		return 0;
 67
 68	err = mipi_dsi_dcs_enter_sleep_mode(innolux->link);
 69	if (err < 0) {
 70		DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
 71			      err);
 72		return err;
 73	}
 74
 75	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
 76
 77	/* T8: 80ms - 1000ms */
 78	msleep(80);
 79
 80	err = regulator_disable(innolux->supply);
 81	if (err < 0)
 82		return err;
 83
 84	innolux->prepared = false;
 85
 86	return 0;
 87}
 88
 89static int innolux_panel_prepare(struct drm_panel *panel)
 90{
 91	struct innolux_panel *innolux = to_innolux_panel(panel);
 92	int err, regulator_err;
 93
 94	if (innolux->prepared)
 95		return 0;
 96
 97	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
 98
 99	err = regulator_enable(innolux->supply);
100	if (err < 0)
101		return err;
102
103	/* T2: 15ms - 1000ms */
104	usleep_range(15000, 16000);
105
106	gpiod_set_value_cansleep(innolux->enable_gpio, 1);
107
108	/* T4: 15ms - 1000ms */
109	usleep_range(15000, 16000);
110
111	err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
112	if (err < 0) {
113		DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
114			      err);
115		goto poweroff;
116	}
117
118	/* T6: 120ms - 1000ms*/
119	msleep(120);
120
121	err = mipi_dsi_dcs_set_display_on(innolux->link);
122	if (err < 0) {
123		DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
124			      err);
125		goto poweroff;
126	}
127
128	/* T7: 5ms */
129	usleep_range(5000, 6000);
130
131	innolux->prepared = true;
132
133	return 0;
134
135poweroff:
136	regulator_err = regulator_disable(innolux->supply);
137	if (regulator_err)
138		DRM_DEV_ERROR(panel->dev, "failed to disable regulator: %d\n",
139			      regulator_err);
140
141	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
142	return err;
143}
144
145static int innolux_panel_enable(struct drm_panel *panel)
146{
147	struct innolux_panel *innolux = to_innolux_panel(panel);
148	int ret;
149
150	if (innolux->enabled)
151		return 0;
152
153	ret = backlight_enable(innolux->backlight);
154	if (ret) {
155		DRM_DEV_ERROR(panel->drm->dev,
156			      "Failed to enable backlight %d\n", ret);
157		return ret;
158	}
159
160	innolux->enabled = true;
161
162	return 0;
163}
164
165static const struct drm_display_mode default_mode = {
166	.clock = 56900,
167	.hdisplay = 768,
168	.hsync_start = 768 + 40,
169	.hsync_end = 768 + 40 + 40,
170	.htotal = 768 + 40 + 40 + 40,
171	.vdisplay = 1024,
172	.vsync_start = 1024 + 20,
173	.vsync_end = 1024 + 20 + 4,
174	.vtotal = 1024 + 20 + 4 + 20,
175	.vrefresh = 60,
176};
177
178static int innolux_panel_get_modes(struct drm_panel *panel)
179{
180	struct drm_display_mode *mode;
181
182	mode = drm_mode_duplicate(panel->drm, &default_mode);
183	if (!mode) {
184		DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
185			      default_mode.hdisplay, default_mode.vdisplay,
186			      default_mode.vrefresh);
187		return -ENOMEM;
188	}
189
190	drm_mode_set_name(mode);
191
192	drm_mode_probed_add(panel->connector, mode);
193
194	panel->connector->display_info.width_mm = 120;
195	panel->connector->display_info.height_mm = 160;
196	panel->connector->display_info.bpc = 8;
197
198	return 1;
199}
200
201static const struct drm_panel_funcs innolux_panel_funcs = {
202	.disable = innolux_panel_disable,
203	.unprepare = innolux_panel_unprepare,
204	.prepare = innolux_panel_prepare,
205	.enable = innolux_panel_enable,
206	.get_modes = innolux_panel_get_modes,
207};
208
209static const struct of_device_id innolux_of_match[] = {
210	{ .compatible = "innolux,p079zca", },
211	{ }
212};
213MODULE_DEVICE_TABLE(of, innolux_of_match);
214
215static int innolux_panel_add(struct innolux_panel *innolux)
216{
217	struct device *dev = &innolux->link->dev;
218	int err;
219
220	innolux->supply = devm_regulator_get(dev, "power");
221	if (IS_ERR(innolux->supply))
222		return PTR_ERR(innolux->supply);
223
224	innolux->enable_gpio = devm_gpiod_get_optional(dev, "enable",
225						       GPIOD_OUT_HIGH);
226	if (IS_ERR(innolux->enable_gpio)) {
227		err = PTR_ERR(innolux->enable_gpio);
228		dev_dbg(dev, "failed to get enable gpio: %d\n", err);
229		innolux->enable_gpio = NULL;
230	}
231
232	innolux->backlight = devm_of_find_backlight(dev);
233
234	if (IS_ERR(innolux->backlight))
235		return PTR_ERR(innolux->backlight);
236
237	drm_panel_init(&innolux->base);
238	innolux->base.funcs = &innolux_panel_funcs;
239	innolux->base.dev = &innolux->link->dev;
240
241	return drm_panel_add(&innolux->base);
242}
243
244static void innolux_panel_del(struct innolux_panel *innolux)
245{
246	if (innolux->base.dev)
247		drm_panel_remove(&innolux->base);
248}
249
250static int innolux_panel_probe(struct mipi_dsi_device *dsi)
251{
252	struct innolux_panel *innolux;
253	int err;
254
255	dsi->lanes = 4;
256	dsi->format = MIPI_DSI_FMT_RGB888;
257	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
258			  MIPI_DSI_MODE_LPM;
259
260	innolux = devm_kzalloc(&dsi->dev, sizeof(*innolux), GFP_KERNEL);
261	if (!innolux)
262		return -ENOMEM;
263
264	mipi_dsi_set_drvdata(dsi, innolux);
265
266	innolux->link = dsi;
267
268	err = innolux_panel_add(innolux);
269	if (err < 0)
270		return err;
271
272	err = mipi_dsi_attach(dsi);
273	return err;
274}
275
276static int innolux_panel_remove(struct mipi_dsi_device *dsi)
277{
278	struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
279	int err;
280
281	err = innolux_panel_unprepare(&innolux->base);
282	if (err < 0)
283		DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
284			      err);
285
286	err = innolux_panel_disable(&innolux->base);
287	if (err < 0)
288		DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
289
290	err = mipi_dsi_detach(dsi);
291	if (err < 0)
292		DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
293			      err);
294
295	drm_panel_detach(&innolux->base);
296	innolux_panel_del(innolux);
297
298	return 0;
299}
300
301static void innolux_panel_shutdown(struct mipi_dsi_device *dsi)
302{
303	struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
304
305	innolux_panel_unprepare(&innolux->base);
306	innolux_panel_disable(&innolux->base);
307}
308
309static struct mipi_dsi_driver innolux_panel_driver = {
310	.driver = {
311		.name = "panel-innolux-p079zca",
312		.of_match_table = innolux_of_match,
313	},
314	.probe = innolux_panel_probe,
315	.remove = innolux_panel_remove,
316	.shutdown = innolux_panel_shutdown,
317};
318module_mipi_dsi_driver(innolux_panel_driver);
319
320MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
321MODULE_DESCRIPTION("Innolux P079ZCA panel driver");
322MODULE_LICENSE("GPL v2");