1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2015 Red Hat
  4 * Copyright (C) 2015 Sony Mobile Communications Inc.
  5 * Author: Werner Johansson <werner.johansson@sonymobile.com>
  6 *
  7 * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
  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_device.h>
 21#include <drm/drm_mipi_dsi.h>
 22#include <drm/drm_panel.h>
 23
 24struct sharp_nt_panel {
 25	struct drm_panel base;
 26	struct mipi_dsi_device *dsi;
 27
 28	struct backlight_device *backlight;
 29	struct regulator *supply;
 30	struct gpio_desc *reset_gpio;
 31
 32	bool prepared;
 33	bool enabled;
 34
 35	const struct drm_display_mode *mode;
 36};
 37
 38static inline struct sharp_nt_panel *to_sharp_nt_panel(struct drm_panel *panel)
 39{
 40	return container_of(panel, struct sharp_nt_panel, base);
 41}
 42
 43static int sharp_nt_panel_init(struct sharp_nt_panel *sharp_nt)
 44{
 45	struct mipi_dsi_device *dsi = sharp_nt->dsi;
 46	int ret;
 47
 48	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 49
 50	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 51	if (ret < 0)
 52		return ret;
 53
 54	msleep(120);
 55
 56	/* Novatek two-lane operation */
 57	ret = mipi_dsi_dcs_write(dsi, 0xae, (u8[]){ 0x03 }, 1);
 58	if (ret < 0)
 59		return ret;
 60
 61	/* Set both MCU and RGB I/F to 24bpp */
 62	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
 63					(MIPI_DCS_PIXEL_FMT_24BIT << 4));
 64	if (ret < 0)
 65		return ret;
 66
 67	return 0;
 68}
 69
 70static int sharp_nt_panel_on(struct sharp_nt_panel *sharp_nt)
 71{
 72	struct mipi_dsi_device *dsi = sharp_nt->dsi;
 73	int ret;
 74
 75	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 76
 77	ret = mipi_dsi_dcs_set_display_on(dsi);
 78	if (ret < 0)
 79		return ret;
 80
 81	return 0;
 82}
 83
 84static int sharp_nt_panel_off(struct sharp_nt_panel *sharp_nt)
 85{
 86	struct mipi_dsi_device *dsi = sharp_nt->dsi;
 87	int ret;
 88
 89	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 90
 91	ret = mipi_dsi_dcs_set_display_off(dsi);
 92	if (ret < 0)
 93		return ret;
 94
 95	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 96	if (ret < 0)
 97		return ret;
 98
 99	return 0;
100}
101
102
103static int sharp_nt_panel_disable(struct drm_panel *panel)
104{
105	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
106
107	if (!sharp_nt->enabled)
108		return 0;
109
110	backlight_disable(sharp_nt->backlight);
111
112	sharp_nt->enabled = false;
113
114	return 0;
115}
116
117static int sharp_nt_panel_unprepare(struct drm_panel *panel)
118{
119	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
120	int ret;
121
122	if (!sharp_nt->prepared)
123		return 0;
124
125	ret = sharp_nt_panel_off(sharp_nt);
126	if (ret < 0) {
127		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
128		return ret;
129	}
130
131	regulator_disable(sharp_nt->supply);
132	if (sharp_nt->reset_gpio)
133		gpiod_set_value(sharp_nt->reset_gpio, 0);
134
135	sharp_nt->prepared = false;
136
137	return 0;
138}
139
140static int sharp_nt_panel_prepare(struct drm_panel *panel)
141{
142	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
143	int ret;
144
145	if (sharp_nt->prepared)
146		return 0;
147
148	ret = regulator_enable(sharp_nt->supply);
149	if (ret < 0)
150		return ret;
151
152	msleep(20);
153
154	if (sharp_nt->reset_gpio) {
155		gpiod_set_value(sharp_nt->reset_gpio, 1);
156		msleep(1);
157		gpiod_set_value(sharp_nt->reset_gpio, 0);
158		msleep(1);
159		gpiod_set_value(sharp_nt->reset_gpio, 1);
160		msleep(10);
161	}
162
163	ret = sharp_nt_panel_init(sharp_nt);
164	if (ret < 0) {
165		dev_err(panel->dev, "failed to init panel: %d\n", ret);
166		goto poweroff;
167	}
168
169	ret = sharp_nt_panel_on(sharp_nt);
170	if (ret < 0) {
171		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
172		goto poweroff;
173	}
174
175	sharp_nt->prepared = true;
176
177	return 0;
178
179poweroff:
180	regulator_disable(sharp_nt->supply);
181	if (sharp_nt->reset_gpio)
182		gpiod_set_value(sharp_nt->reset_gpio, 0);
183	return ret;
184}
185
186static int sharp_nt_panel_enable(struct drm_panel *panel)
187{
188	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
189
190	if (sharp_nt->enabled)
191		return 0;
192
193	backlight_enable(sharp_nt->backlight);
194
195	sharp_nt->enabled = true;
196
197	return 0;
198}
199
200static const struct drm_display_mode default_mode = {
201	.clock = 41118,
202	.hdisplay = 540,
203	.hsync_start = 540 + 48,
204	.hsync_end = 540 + 48 + 80,
205	.htotal = 540 + 48 + 80 + 32,
206	.vdisplay = 960,
207	.vsync_start = 960 + 3,
208	.vsync_end = 960 + 3 + 15,
209	.vtotal = 960 + 3 + 15 + 1,
210	.vrefresh = 60,
211};
212
213static int sharp_nt_panel_get_modes(struct drm_panel *panel)
214{
215	struct drm_display_mode *mode;
216
217	mode = drm_mode_duplicate(panel->drm, &default_mode);
218	if (!mode) {
219		dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
220				default_mode.hdisplay, default_mode.vdisplay,
221				default_mode.vrefresh);
222		return -ENOMEM;
223	}
224
225	drm_mode_set_name(mode);
226
227	drm_mode_probed_add(panel->connector, mode);
228
229	panel->connector->display_info.width_mm = 54;
230	panel->connector->display_info.height_mm = 95;
231
232	return 1;
233}
234
235static const struct drm_panel_funcs sharp_nt_panel_funcs = {
236	.disable = sharp_nt_panel_disable,
237	.unprepare = sharp_nt_panel_unprepare,
238	.prepare = sharp_nt_panel_prepare,
239	.enable = sharp_nt_panel_enable,
240	.get_modes = sharp_nt_panel_get_modes,
241};
242
243static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
244{
245	struct device *dev = &sharp_nt->dsi->dev;
246
247	sharp_nt->mode = &default_mode;
248
249	sharp_nt->supply = devm_regulator_get(dev, "avdd");
250	if (IS_ERR(sharp_nt->supply))
251		return PTR_ERR(sharp_nt->supply);
252
253	sharp_nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
254	if (IS_ERR(sharp_nt->reset_gpio)) {
255		dev_err(dev, "cannot get reset-gpios %ld\n",
256			PTR_ERR(sharp_nt->reset_gpio));
257		sharp_nt->reset_gpio = NULL;
258	} else {
259		gpiod_set_value(sharp_nt->reset_gpio, 0);
260	}
261
262	sharp_nt->backlight = devm_of_find_backlight(dev);
263
264	if (IS_ERR(sharp_nt->backlight))
265		return PTR_ERR(sharp_nt->backlight);
266
267	drm_panel_init(&sharp_nt->base);
268	sharp_nt->base.funcs = &sharp_nt_panel_funcs;
269	sharp_nt->base.dev = &sharp_nt->dsi->dev;
270
271	return drm_panel_add(&sharp_nt->base);
272}
273
274static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
275{
276	if (sharp_nt->base.dev)
277		drm_panel_remove(&sharp_nt->base);
278}
279
280static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
281{
282	struct sharp_nt_panel *sharp_nt;
283	int ret;
284
285	dsi->lanes = 2;
286	dsi->format = MIPI_DSI_FMT_RGB888;
287	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
288			MIPI_DSI_MODE_VIDEO_HSE |
289			MIPI_DSI_CLOCK_NON_CONTINUOUS |
290			MIPI_DSI_MODE_EOT_PACKET;
291
292	sharp_nt = devm_kzalloc(&dsi->dev, sizeof(*sharp_nt), GFP_KERNEL);
293	if (!sharp_nt)
294		return -ENOMEM;
295
296	mipi_dsi_set_drvdata(dsi, sharp_nt);
297
298	sharp_nt->dsi = dsi;
299
300	ret = sharp_nt_panel_add(sharp_nt);
301	if (ret < 0)
302		return ret;
303
304	return mipi_dsi_attach(dsi);
305}
306
307static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
308{
309	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
310	int ret;
311
312	ret = sharp_nt_panel_disable(&sharp_nt->base);
313	if (ret < 0)
314		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
315
316	ret = mipi_dsi_detach(dsi);
317	if (ret < 0)
318		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
319
320	sharp_nt_panel_del(sharp_nt);
321
322	return 0;
323}
324
325static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
326{
327	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
328
329	sharp_nt_panel_disable(&sharp_nt->base);
330}
331
332static const struct of_device_id sharp_nt_of_match[] = {
333	{ .compatible = "sharp,ls043t1le01-qhd", },
334	{ }
335};
336MODULE_DEVICE_TABLE(of, sharp_nt_of_match);
337
338static struct mipi_dsi_driver sharp_nt_panel_driver = {
339	.driver = {
340		.name = "panel-sharp-ls043t1le01-qhd",
341		.of_match_table = sharp_nt_of_match,
342	},
343	.probe = sharp_nt_panel_probe,
344	.remove = sharp_nt_panel_remove,
345	.shutdown = sharp_nt_panel_shutdown,
346};
347module_mipi_dsi_driver(sharp_nt_panel_driver);
348
349MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
350MODULE_DESCRIPTION("Sharp LS043T1LE01 NT35565-based qHD (540x960) video mode panel driver");
351MODULE_LICENSE("GPL v2");