1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <linux/backlight.h>
4 #include <linux/delay.h>
5 #include <linux/gpio/consumer.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/regulator/consumer.h>
9 
10 #include <drm/drm_mipi_dsi.h>
11 #include <drm/drm_modes.h>
12 #include <drm/drm_panel.h>
13 
14 struct tm5p5_nt35596 {
15 	struct drm_panel panel;
16 	struct mipi_dsi_device *dsi;
17 	struct regulator_bulk_data supplies[2];
18 	struct gpio_desc *reset_gpio;
19 	bool prepared;
20 };
21 
22 static inline struct tm5p5_nt35596 *to_tm5p5_nt35596(struct drm_panel *panel)
23 {
24 	return container_of(panel, struct tm5p5_nt35596, panel);
25 }
26 
27 static void tm5p5_nt35596_reset(struct tm5p5_nt35596 *ctx)
28 {
29 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
30 	usleep_range(1000, 2000);
31 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
32 	usleep_range(1000, 2000);
33 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
34 	usleep_range(15000, 16000);
35 }
36 
37 static int tm5p5_nt35596_on(struct tm5p5_nt35596 *ctx)
38 {
39 	struct mipi_dsi_device *dsi = ctx->dsi;
40 
41 	mipi_dsi_generic_write_seq(dsi, 0xff, 0x05);
42 	mipi_dsi_generic_write_seq(dsi, 0xfb, 0x01);
43 	mipi_dsi_generic_write_seq(dsi, 0xc5, 0x31);
44 	mipi_dsi_generic_write_seq(dsi, 0xff, 0x04);
45 	mipi_dsi_generic_write_seq(dsi, 0x01, 0x84);
46 	mipi_dsi_generic_write_seq(dsi, 0x05, 0x25);
47 	mipi_dsi_generic_write_seq(dsi, 0x06, 0x01);
48 	mipi_dsi_generic_write_seq(dsi, 0x07, 0x20);
49 	mipi_dsi_generic_write_seq(dsi, 0x08, 0x06);
50 	mipi_dsi_generic_write_seq(dsi, 0x09, 0x08);
51 	mipi_dsi_generic_write_seq(dsi, 0x0a, 0x10);
52 	mipi_dsi_generic_write_seq(dsi, 0x0b, 0x10);
53 	mipi_dsi_generic_write_seq(dsi, 0x0c, 0x10);
54 	mipi_dsi_generic_write_seq(dsi, 0x0d, 0x14);
55 	mipi_dsi_generic_write_seq(dsi, 0x0e, 0x14);
56 	mipi_dsi_generic_write_seq(dsi, 0x0f, 0x14);
57 	mipi_dsi_generic_write_seq(dsi, 0x10, 0x14);
58 	mipi_dsi_generic_write_seq(dsi, 0x11, 0x14);
59 	mipi_dsi_generic_write_seq(dsi, 0x12, 0x14);
60 	mipi_dsi_generic_write_seq(dsi, 0x17, 0xf3);
61 	mipi_dsi_generic_write_seq(dsi, 0x18, 0xc0);
62 	mipi_dsi_generic_write_seq(dsi, 0x19, 0xc0);
63 	mipi_dsi_generic_write_seq(dsi, 0x1a, 0xc0);
64 	mipi_dsi_generic_write_seq(dsi, 0x1b, 0xb3);
65 	mipi_dsi_generic_write_seq(dsi, 0x1c, 0xb3);
66 	mipi_dsi_generic_write_seq(dsi, 0x1d, 0xb3);
67 	mipi_dsi_generic_write_seq(dsi, 0x1e, 0xb3);
68 	mipi_dsi_generic_write_seq(dsi, 0x1f, 0xb3);
69 	mipi_dsi_generic_write_seq(dsi, 0x20, 0xb3);
70 	mipi_dsi_generic_write_seq(dsi, 0xfb, 0x01);
71 	mipi_dsi_generic_write_seq(dsi, 0xff, 0x00);
72 	mipi_dsi_generic_write_seq(dsi, 0xfb, 0x01);
73 	mipi_dsi_generic_write_seq(dsi, 0x35, 0x01);
74 	mipi_dsi_generic_write_seq(dsi, 0xd3, 0x06);
75 	mipi_dsi_generic_write_seq(dsi, 0xd4, 0x04);
76 	mipi_dsi_generic_write_seq(dsi, 0x5e, 0x0d);
77 	mipi_dsi_generic_write_seq(dsi, 0x11, 0x00);
78 	msleep(100);
79 	mipi_dsi_generic_write_seq(dsi, 0x29, 0x00);
80 	mipi_dsi_generic_write_seq(dsi, 0x53, 0x24);
81 
82 	return 0;
83 }
84 
85 static int tm5p5_nt35596_off(struct tm5p5_nt35596 *ctx)
86 {
87 	struct mipi_dsi_device *dsi = ctx->dsi;
88 	struct device *dev = &dsi->dev;
89 	int ret;
90 
91 	ret = mipi_dsi_dcs_set_display_off(dsi);
92 	if (ret < 0) {
93 		dev_err(dev, "Failed to set display off: %d\n", ret);
94 		return ret;
95 	}
96 	msleep(60);
97 
98 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
99 	if (ret < 0) {
100 		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
101 		return ret;
102 	}
103 
104 	mipi_dsi_dcs_write_seq(dsi, 0x4f, 0x01);
105 
106 	return 0;
107 }
108 
109 static int tm5p5_nt35596_prepare(struct drm_panel *panel)
110 {
111 	struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
112 	struct device *dev = &ctx->dsi->dev;
113 	int ret;
114 
115 	if (ctx->prepared)
116 		return 0;
117 
118 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
119 	if (ret < 0) {
120 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
121 		return ret;
122 	}
123 
124 	tm5p5_nt35596_reset(ctx);
125 
126 	ret = tm5p5_nt35596_on(ctx);
127 	if (ret < 0) {
128 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
129 		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
130 		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
131 				       ctx->supplies);
132 		return ret;
133 	}
134 
135 	ctx->prepared = true;
136 	return 0;
137 }
138 
139 static int tm5p5_nt35596_unprepare(struct drm_panel *panel)
140 {
141 	struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
142 	struct device *dev = &ctx->dsi->dev;
143 	int ret;
144 
145 	if (!ctx->prepared)
146 		return 0;
147 
148 	ret = tm5p5_nt35596_off(ctx);
149 	if (ret < 0)
150 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
151 
152 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
153 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
154 			       ctx->supplies);
155 
156 	ctx->prepared = false;
157 	return 0;
158 }
159 
160 static const struct drm_display_mode tm5p5_nt35596_mode = {
161 	.clock = (1080 + 100 + 8 + 16) * (1920 + 4 + 2 + 4) * 60 / 1000,
162 	.hdisplay = 1080,
163 	.hsync_start = 1080 + 100,
164 	.hsync_end = 1080 + 100 + 8,
165 	.htotal = 1080 + 100 + 8 + 16,
166 	.vdisplay = 1920,
167 	.vsync_start = 1920 + 4,
168 	.vsync_end = 1920 + 4 + 2,
169 	.vtotal = 1920 + 4 + 2 + 4,
170 	.width_mm = 68,
171 	.height_mm = 121,
172 };
173 
174 static int tm5p5_nt35596_get_modes(struct drm_panel *panel,
175 				   struct drm_connector *connector)
176 {
177 	struct drm_display_mode *mode;
178 
179 	mode = drm_mode_duplicate(connector->dev, &tm5p5_nt35596_mode);
180 	if (!mode)
181 		return -ENOMEM;
182 
183 	drm_mode_set_name(mode);
184 
185 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
186 	connector->display_info.width_mm = mode->width_mm;
187 	connector->display_info.height_mm = mode->height_mm;
188 	drm_mode_probed_add(connector, mode);
189 
190 	return 1;
191 }
192 
193 static const struct drm_panel_funcs tm5p5_nt35596_panel_funcs = {
194 	.prepare = tm5p5_nt35596_prepare,
195 	.unprepare = tm5p5_nt35596_unprepare,
196 	.get_modes = tm5p5_nt35596_get_modes,
197 };
198 
199 static int tm5p5_nt35596_bl_update_status(struct backlight_device *bl)
200 {
201 	struct mipi_dsi_device *dsi = bl_get_data(bl);
202 	u16 brightness = backlight_get_brightness(bl);
203 	int ret;
204 
205 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
206 
207 	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
208 	if (ret < 0)
209 		return ret;
210 
211 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
212 
213 	return 0;
214 }
215 
216 static int tm5p5_nt35596_bl_get_brightness(struct backlight_device *bl)
217 {
218 	struct mipi_dsi_device *dsi = bl_get_data(bl);
219 	u16 brightness = bl->props.brightness;
220 	int ret;
221 
222 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
223 
224 	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
225 	if (ret < 0)
226 		return ret;
227 
228 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
229 
230 	return brightness & 0xff;
231 }
232 
233 static const struct backlight_ops tm5p5_nt35596_bl_ops = {
234 	.update_status = tm5p5_nt35596_bl_update_status,
235 	.get_brightness = tm5p5_nt35596_bl_get_brightness,
236 };
237 
238 static struct backlight_device *
239 tm5p5_nt35596_create_backlight(struct mipi_dsi_device *dsi)
240 {
241 	struct device *dev = &dsi->dev;
242 	const struct backlight_properties props = {
243 		.type = BACKLIGHT_RAW,
244 		.brightness = 255,
245 		.max_brightness = 255,
246 	};
247 
248 	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
249 					      &tm5p5_nt35596_bl_ops, &props);
250 }
251 
252 static int tm5p5_nt35596_probe(struct mipi_dsi_device *dsi)
253 {
254 	struct device *dev = &dsi->dev;
255 	struct tm5p5_nt35596 *ctx;
256 	int ret;
257 
258 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
259 	if (!ctx)
260 		return -ENOMEM;
261 
262 	ctx->supplies[0].supply = "vdd";
263 	ctx->supplies[1].supply = "vddio";
264 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
265 				      ctx->supplies);
266 	if (ret < 0) {
267 		dev_err(dev, "Failed to get regulators: %d\n", ret);
268 		return ret;
269 	}
270 
271 	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
272 	if (IS_ERR(ctx->reset_gpio)) {
273 		ret = PTR_ERR(ctx->reset_gpio);
274 		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
275 		return ret;
276 	}
277 
278 	ctx->dsi = dsi;
279 	mipi_dsi_set_drvdata(dsi, ctx);
280 
281 	dsi->lanes = 4;
282 	dsi->format = MIPI_DSI_FMT_RGB888;
283 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
284 			  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_NO_EOT_PACKET |
285 			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
286 
287 	drm_panel_init(&ctx->panel, dev, &tm5p5_nt35596_panel_funcs,
288 		       DRM_MODE_CONNECTOR_DSI);
289 
290 	ctx->panel.backlight = tm5p5_nt35596_create_backlight(dsi);
291 	if (IS_ERR(ctx->panel.backlight)) {
292 		ret = PTR_ERR(ctx->panel.backlight);
293 		dev_err(dev, "Failed to create backlight: %d\n", ret);
294 		return ret;
295 	}
296 
297 	drm_panel_add(&ctx->panel);
298 
299 	ret = mipi_dsi_attach(dsi);
300 	if (ret < 0) {
301 		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
302 		return ret;
303 	}
304 
305 	return 0;
306 }
307 
308 static void tm5p5_nt35596_remove(struct mipi_dsi_device *dsi)
309 {
310 	struct tm5p5_nt35596 *ctx = mipi_dsi_get_drvdata(dsi);
311 	int ret;
312 
313 	ret = mipi_dsi_detach(dsi);
314 	if (ret < 0)
315 		dev_err(&dsi->dev,
316 			"Failed to detach from DSI host: %d\n", ret);
317 
318 	drm_panel_remove(&ctx->panel);
319 }
320 
321 static const struct of_device_id tm5p5_nt35596_of_match[] = {
322 	{ .compatible = "asus,z00t-tm5p5-n35596" },
323 	{ /* sentinel */ }
324 };
325 MODULE_DEVICE_TABLE(of, tm5p5_nt35596_of_match);
326 
327 static struct mipi_dsi_driver tm5p5_nt35596_driver = {
328 	.probe = tm5p5_nt35596_probe,
329 	.remove = tm5p5_nt35596_remove,
330 	.driver = {
331 		.name = "panel-tm5p5-nt35596",
332 		.of_match_table = tm5p5_nt35596_of_match,
333 	},
334 };
335 module_mipi_dsi_driver(tm5p5_nt35596_driver);
336 
337 MODULE_AUTHOR("Konrad Dybcio <konradybcio@gmail.com>");
338 MODULE_DESCRIPTION("DRM driver for tm5p5 nt35596 1080p video mode dsi panel");
339 MODULE_LICENSE("GPL v2");
340