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 	bool enabled;
32 
33 	const struct drm_display_mode *mode;
34 };
35 
36 static inline struct sharp_nt_panel *to_sharp_nt_panel(struct drm_panel *panel)
37 {
38 	return container_of(panel, struct sharp_nt_panel, base);
39 }
40 
41 static int sharp_nt_panel_init(struct sharp_nt_panel *sharp_nt)
42 {
43 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
44 	int ret;
45 
46 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
47 
48 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
49 	if (ret < 0)
50 		return ret;
51 
52 	msleep(120);
53 
54 	/* Novatek two-lane operation */
55 	ret = mipi_dsi_dcs_write(dsi, 0xae, (u8[]){ 0x03 }, 1);
56 	if (ret < 0)
57 		return ret;
58 
59 	/* Set both MCU and RGB I/F to 24bpp */
60 	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
61 					(MIPI_DCS_PIXEL_FMT_24BIT << 4));
62 	if (ret < 0)
63 		return ret;
64 
65 	return 0;
66 }
67 
68 static int sharp_nt_panel_on(struct sharp_nt_panel *sharp_nt)
69 {
70 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
71 	int ret;
72 
73 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
74 
75 	ret = mipi_dsi_dcs_set_display_on(dsi);
76 	if (ret < 0)
77 		return ret;
78 
79 	return 0;
80 }
81 
82 static int sharp_nt_panel_off(struct sharp_nt_panel *sharp_nt)
83 {
84 	struct mipi_dsi_device *dsi = sharp_nt->dsi;
85 	int ret;
86 
87 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
88 
89 	ret = mipi_dsi_dcs_set_display_off(dsi);
90 	if (ret < 0)
91 		return ret;
92 
93 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
94 	if (ret < 0)
95 		return ret;
96 
97 	return 0;
98 }
99 
100 
101 static int sharp_nt_panel_disable(struct drm_panel *panel)
102 {
103 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
104 
105 	if (!sharp_nt->enabled)
106 		return 0;
107 
108 	sharp_nt->enabled = false;
109 
110 	return 0;
111 }
112 
113 static int sharp_nt_panel_unprepare(struct drm_panel *panel)
114 {
115 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
116 	int ret;
117 
118 	if (!sharp_nt->prepared)
119 		return 0;
120 
121 	ret = sharp_nt_panel_off(sharp_nt);
122 	if (ret < 0) {
123 		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
124 		return ret;
125 	}
126 
127 	regulator_disable(sharp_nt->supply);
128 	if (sharp_nt->reset_gpio)
129 		gpiod_set_value(sharp_nt->reset_gpio, 0);
130 
131 	sharp_nt->prepared = false;
132 
133 	return 0;
134 }
135 
136 static int sharp_nt_panel_prepare(struct drm_panel *panel)
137 {
138 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
139 	int ret;
140 
141 	if (sharp_nt->prepared)
142 		return 0;
143 
144 	ret = regulator_enable(sharp_nt->supply);
145 	if (ret < 0)
146 		return ret;
147 
148 	msleep(20);
149 
150 	if (sharp_nt->reset_gpio) {
151 		gpiod_set_value(sharp_nt->reset_gpio, 1);
152 		msleep(1);
153 		gpiod_set_value(sharp_nt->reset_gpio, 0);
154 		msleep(1);
155 		gpiod_set_value(sharp_nt->reset_gpio, 1);
156 		msleep(10);
157 	}
158 
159 	ret = sharp_nt_panel_init(sharp_nt);
160 	if (ret < 0) {
161 		dev_err(panel->dev, "failed to init panel: %d\n", ret);
162 		goto poweroff;
163 	}
164 
165 	ret = sharp_nt_panel_on(sharp_nt);
166 	if (ret < 0) {
167 		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
168 		goto poweroff;
169 	}
170 
171 	sharp_nt->prepared = true;
172 
173 	return 0;
174 
175 poweroff:
176 	regulator_disable(sharp_nt->supply);
177 	if (sharp_nt->reset_gpio)
178 		gpiod_set_value(sharp_nt->reset_gpio, 0);
179 	return ret;
180 }
181 
182 static int sharp_nt_panel_enable(struct drm_panel *panel)
183 {
184 	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
185 
186 	if (sharp_nt->enabled)
187 		return 0;
188 
189 	sharp_nt->enabled = true;
190 
191 	return 0;
192 }
193 
194 static const struct drm_display_mode default_mode = {
195 	.clock = 41118,
196 	.hdisplay = 540,
197 	.hsync_start = 540 + 48,
198 	.hsync_end = 540 + 48 + 80,
199 	.htotal = 540 + 48 + 80 + 32,
200 	.vdisplay = 960,
201 	.vsync_start = 960 + 3,
202 	.vsync_end = 960 + 3 + 15,
203 	.vtotal = 960 + 3 + 15 + 1,
204 };
205 
206 static int sharp_nt_panel_get_modes(struct drm_panel *panel,
207 				    struct drm_connector *connector)
208 {
209 	struct drm_display_mode *mode;
210 
211 	mode = drm_mode_duplicate(connector->dev, &default_mode);
212 	if (!mode) {
213 		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
214 			default_mode.hdisplay, default_mode.vdisplay,
215 			drm_mode_vrefresh(&default_mode));
216 		return -ENOMEM;
217 	}
218 
219 	drm_mode_set_name(mode);
220 
221 	drm_mode_probed_add(connector, mode);
222 
223 	connector->display_info.width_mm = 54;
224 	connector->display_info.height_mm = 95;
225 
226 	return 1;
227 }
228 
229 static const struct drm_panel_funcs sharp_nt_panel_funcs = {
230 	.disable = sharp_nt_panel_disable,
231 	.unprepare = sharp_nt_panel_unprepare,
232 	.prepare = sharp_nt_panel_prepare,
233 	.enable = sharp_nt_panel_enable,
234 	.get_modes = sharp_nt_panel_get_modes,
235 };
236 
237 static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
238 {
239 	struct device *dev = &sharp_nt->dsi->dev;
240 	int ret;
241 
242 	sharp_nt->mode = &default_mode;
243 
244 	sharp_nt->supply = devm_regulator_get(dev, "avdd");
245 	if (IS_ERR(sharp_nt->supply))
246 		return PTR_ERR(sharp_nt->supply);
247 
248 	sharp_nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
249 	if (IS_ERR(sharp_nt->reset_gpio)) {
250 		dev_err(dev, "cannot get reset-gpios %ld\n",
251 			PTR_ERR(sharp_nt->reset_gpio));
252 		sharp_nt->reset_gpio = NULL;
253 	} else {
254 		gpiod_set_value(sharp_nt->reset_gpio, 0);
255 	}
256 
257 	drm_panel_init(&sharp_nt->base, &sharp_nt->dsi->dev,
258 		       &sharp_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
259 
260 	ret = drm_panel_of_backlight(&sharp_nt->base);
261 	if (ret)
262 		return ret;
263 
264 	drm_panel_add(&sharp_nt->base);
265 
266 	return 0;
267 }
268 
269 static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
270 {
271 	if (sharp_nt->base.dev)
272 		drm_panel_remove(&sharp_nt->base);
273 }
274 
275 static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
276 {
277 	struct sharp_nt_panel *sharp_nt;
278 	int ret;
279 
280 	dsi->lanes = 2;
281 	dsi->format = MIPI_DSI_FMT_RGB888;
282 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
283 			MIPI_DSI_MODE_VIDEO_HSE |
284 			MIPI_DSI_CLOCK_NON_CONTINUOUS |
285 			MIPI_DSI_MODE_NO_EOT_PACKET;
286 
287 	sharp_nt = devm_kzalloc(&dsi->dev, sizeof(*sharp_nt), GFP_KERNEL);
288 	if (!sharp_nt)
289 		return -ENOMEM;
290 
291 	mipi_dsi_set_drvdata(dsi, sharp_nt);
292 
293 	sharp_nt->dsi = dsi;
294 
295 	ret = sharp_nt_panel_add(sharp_nt);
296 	if (ret < 0)
297 		return ret;
298 
299 	ret = mipi_dsi_attach(dsi);
300 	if (ret < 0) {
301 		sharp_nt_panel_del(sharp_nt);
302 		return ret;
303 	}
304 
305 	return 0;
306 }
307 
308 static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
309 {
310 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
311 	int ret;
312 
313 	ret = drm_panel_disable(&sharp_nt->base);
314 	if (ret < 0)
315 		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
316 
317 	ret = mipi_dsi_detach(dsi);
318 	if (ret < 0)
319 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
320 
321 	sharp_nt_panel_del(sharp_nt);
322 
323 	return 0;
324 }
325 
326 static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
327 {
328 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
329 
330 	drm_panel_disable(&sharp_nt->base);
331 }
332 
333 static const struct of_device_id sharp_nt_of_match[] = {
334 	{ .compatible = "sharp,ls043t1le01-qhd", },
335 	{ }
336 };
337 MODULE_DEVICE_TABLE(of, sharp_nt_of_match);
338 
339 static struct mipi_dsi_driver sharp_nt_panel_driver = {
340 	.driver = {
341 		.name = "panel-sharp-ls043t1le01-qhd",
342 		.of_match_table = sharp_nt_of_match,
343 	},
344 	.probe = sharp_nt_panel_probe,
345 	.remove = sharp_nt_panel_remove,
346 	.shutdown = sharp_nt_panel_shutdown,
347 };
348 module_mipi_dsi_driver(sharp_nt_panel_driver);
349 
350 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
351 MODULE_DESCRIPTION("Sharp LS043T1LE01 NT35565-based qHD (540x960) video mode panel driver");
352 MODULE_LICENSE("GPL v2");
353