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/delay.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 <video/mipi_display.h>
17 
18 #include <drm/drm_crtc.h>
19 #include <drm/drm_device.h>
20 #include <drm/drm_mipi_dsi.h>
21 #include <drm/drm_panel.h>
22 
23 struct sharp_nt_panel {
24 	struct drm_panel base;
25 	struct mipi_dsi_device *dsi;
26 
27 	struct regulator *supply;
28 	struct gpio_desc *reset_gpio;
29 
30 	bool prepared;
31 };
32 
33 static inline struct sharp_nt_panel *to_sharp_nt_panel(struct drm_panel *panel)
34 {
35 	return container_of(panel, struct sharp_nt_panel, base);
36 }
37 
38 static int sharp_nt_panel_init(struct sharp_nt_panel *sharp_nt)
39 {
40 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
41 	int ret;
42 
43 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
44 
45 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
46 	if (ret < 0)
47 		return ret;
48 
49 	msleep(120);
50 
51 	/* Novatek two-lane operation */
52 	ret = mipi_dsi_dcs_write(dsi, 0xae, (u8[]){ 0x03 }, 1);
53 	if (ret < 0)
54 		return ret;
55 
56 	/* Set both MCU and RGB I/F to 24bpp */
57 	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
58 					(MIPI_DCS_PIXEL_FMT_24BIT << 4));
59 	if (ret < 0)
60 		return ret;
61 
62 	return 0;
63 }
64 
65 static int sharp_nt_panel_on(struct sharp_nt_panel *sharp_nt)
66 {
67 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
68 	int ret;
69 
70 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
71 
72 	ret = mipi_dsi_dcs_set_display_on(dsi);
73 	if (ret < 0)
74 		return ret;
75 
76 	return 0;
77 }
78 
79 static int sharp_nt_panel_off(struct sharp_nt_panel *sharp_nt)
80 {
81 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
82 	int ret;
83 
84 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
85 
86 	ret = mipi_dsi_dcs_set_display_off(dsi);
87 	if (ret < 0)
88 		return ret;
89 
90 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
91 	if (ret < 0)
92 		return ret;
93 
94 	return 0;
95 }
96 
97 static int sharp_nt_panel_unprepare(struct drm_panel *panel)
98 {
99 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
100 	int ret;
101 
102 	if (!sharp_nt->prepared)
103 		return 0;
104 
105 	ret = sharp_nt_panel_off(sharp_nt);
106 	if (ret < 0) {
107 		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
108 		return ret;
109 	}
110 
111 	regulator_disable(sharp_nt->supply);
112 	if (sharp_nt->reset_gpio)
113 		gpiod_set_value(sharp_nt->reset_gpio, 0);
114 
115 	sharp_nt->prepared = false;
116 
117 	return 0;
118 }
119 
120 static int sharp_nt_panel_prepare(struct drm_panel *panel)
121 {
122 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
123 	int ret;
124 
125 	if (sharp_nt->prepared)
126 		return 0;
127 
128 	ret = regulator_enable(sharp_nt->supply);
129 	if (ret < 0)
130 		return ret;
131 
132 	msleep(20);
133 
134 	if (sharp_nt->reset_gpio) {
135 		gpiod_set_value(sharp_nt->reset_gpio, 1);
136 		msleep(1);
137 		gpiod_set_value(sharp_nt->reset_gpio, 0);
138 		msleep(1);
139 		gpiod_set_value(sharp_nt->reset_gpio, 1);
140 		msleep(10);
141 	}
142 
143 	ret = sharp_nt_panel_init(sharp_nt);
144 	if (ret < 0) {
145 		dev_err(panel->dev, "failed to init panel: %d\n", ret);
146 		goto poweroff;
147 	}
148 
149 	ret = sharp_nt_panel_on(sharp_nt);
150 	if (ret < 0) {
151 		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
152 		goto poweroff;
153 	}
154 
155 	sharp_nt->prepared = true;
156 
157 	return 0;
158 
159 poweroff:
160 	regulator_disable(sharp_nt->supply);
161 	if (sharp_nt->reset_gpio)
162 		gpiod_set_value(sharp_nt->reset_gpio, 0);
163 	return ret;
164 }
165 
166 static const struct drm_display_mode default_mode = {
167 	.clock = (540 + 48 + 32 + 80) * (960 + 3 + 10 + 15) * 60 / 1000,
168 	.hdisplay = 540,
169 	.hsync_start = 540 + 48,
170 	.hsync_end = 540 + 48 + 32,
171 	.htotal = 540 + 48 + 32 + 80,
172 	.vdisplay = 960,
173 	.vsync_start = 960 + 3,
174 	.vsync_end = 960 + 3 + 10,
175 	.vtotal = 960 + 3 + 10 + 15,
176 };
177 
178 static int sharp_nt_panel_get_modes(struct drm_panel *panel,
179 				    struct drm_connector *connector)
180 {
181 	struct drm_display_mode *mode;
182 
183 	mode = drm_mode_duplicate(connector->dev, &default_mode);
184 	if (!mode) {
185 		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
186 			default_mode.hdisplay, default_mode.vdisplay,
187 			drm_mode_vrefresh(&default_mode));
188 		return -ENOMEM;
189 	}
190 
191 	drm_mode_set_name(mode);
192 
193 	drm_mode_probed_add(connector, mode);
194 
195 	connector->display_info.width_mm = 54;
196 	connector->display_info.height_mm = 95;
197 
198 	return 1;
199 }
200 
201 static const struct drm_panel_funcs sharp_nt_panel_funcs = {
202 	.unprepare = sharp_nt_panel_unprepare,
203 	.prepare = sharp_nt_panel_prepare,
204 	.get_modes = sharp_nt_panel_get_modes,
205 };
206 
207 static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
208 {
209 	struct device *dev = &sharp_nt->dsi->dev;
210 	int ret;
211 
212 	sharp_nt->supply = devm_regulator_get(dev, "avdd");
213 	if (IS_ERR(sharp_nt->supply))
214 		return PTR_ERR(sharp_nt->supply);
215 
216 	sharp_nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
217 	if (IS_ERR(sharp_nt->reset_gpio)) {
218 		dev_err(dev, "cannot get reset-gpios %ld\n",
219 			PTR_ERR(sharp_nt->reset_gpio));
220 		sharp_nt->reset_gpio = NULL;
221 	} else {
222 		gpiod_set_value(sharp_nt->reset_gpio, 0);
223 	}
224 
225 	drm_panel_init(&sharp_nt->base, &sharp_nt->dsi->dev,
226 		       &sharp_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
227 
228 	ret = drm_panel_of_backlight(&sharp_nt->base);
229 	if (ret)
230 		return ret;
231 
232 	drm_panel_add(&sharp_nt->base);
233 
234 	return 0;
235 }
236 
237 static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
238 {
239 	if (sharp_nt->base.dev)
240 		drm_panel_remove(&sharp_nt->base);
241 }
242 
243 static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
244 {
245 	struct sharp_nt_panel *sharp_nt;
246 	int ret;
247 
248 	dsi->lanes = 2;
249 	dsi->format = MIPI_DSI_FMT_RGB888;
250 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
251 			MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
252 			MIPI_DSI_MODE_VIDEO_HSE |
253 			MIPI_DSI_CLOCK_NON_CONTINUOUS |
254 			MIPI_DSI_MODE_NO_EOT_PACKET;
255 
256 	sharp_nt = devm_kzalloc(&dsi->dev, sizeof(*sharp_nt), GFP_KERNEL);
257 	if (!sharp_nt)
258 		return -ENOMEM;
259 
260 	mipi_dsi_set_drvdata(dsi, sharp_nt);
261 
262 	sharp_nt->dsi = dsi;
263 
264 	ret = sharp_nt_panel_add(sharp_nt);
265 	if (ret < 0)
266 		return ret;
267 
268 	ret = mipi_dsi_attach(dsi);
269 	if (ret < 0) {
270 		sharp_nt_panel_del(sharp_nt);
271 		return ret;
272 	}
273 
274 	return 0;
275 }
276 
277 static void sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
278 {
279 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
280 	int ret;
281 
282 	ret = drm_panel_disable(&sharp_nt->base);
283 	if (ret < 0)
284 		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
285 
286 	ret = mipi_dsi_detach(dsi);
287 	if (ret < 0)
288 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
289 
290 	sharp_nt_panel_del(sharp_nt);
291 }
292 
293 static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
294 {
295 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
296 
297 	drm_panel_disable(&sharp_nt->base);
298 }
299 
300 static const struct of_device_id sharp_nt_of_match[] = {
301 	{ .compatible = "sharp,ls043t1le01-qhd", },
302 	{ }
303 };
304 MODULE_DEVICE_TABLE(of, sharp_nt_of_match);
305 
306 static struct mipi_dsi_driver sharp_nt_panel_driver = {
307 	.driver = {
308 		.name = "panel-sharp-ls043t1le01-qhd",
309 		.of_match_table = sharp_nt_of_match,
310 	},
311 	.probe = sharp_nt_panel_probe,
312 	.remove = sharp_nt_panel_remove,
313 	.shutdown = sharp_nt_panel_shutdown,
314 };
315 module_mipi_dsi_driver(sharp_nt_panel_driver);
316 
317 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
318 MODULE_DESCRIPTION("Sharp LS043T1LE01 NT35565-based qHD (540x960) video mode panel driver");
319 MODULE_LICENSE("GPL v2");
320