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 
to_tm5p5_nt35596(struct drm_panel * panel)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 #define dsi_generic_write_seq(dsi, seq...) do {				\
28 		static const u8 d[] = { seq };				\
29 		int ret;						\
30 		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));	\
31 		if (ret < 0)						\
32 			return ret;					\
33 	} while (0)
34 
35 #define dsi_dcs_write_seq(dsi, seq...) do {				\
36 		static const u8 d[] = { seq };				\
37 		int ret;						\
38 		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
39 		if (ret < 0)						\
40 			return ret;					\
41 	} while (0)
42 
tm5p5_nt35596_reset(struct tm5p5_nt35596 * ctx)43 static void tm5p5_nt35596_reset(struct tm5p5_nt35596 *ctx)
44 {
45 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
46 	usleep_range(1000, 2000);
47 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
48 	usleep_range(1000, 2000);
49 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
50 	usleep_range(15000, 16000);
51 }
52 
tm5p5_nt35596_on(struct tm5p5_nt35596 * ctx)53 static int tm5p5_nt35596_on(struct tm5p5_nt35596 *ctx)
54 {
55 	struct mipi_dsi_device *dsi = ctx->dsi;
56 
57 	dsi_generic_write_seq(dsi, 0xff, 0x05);
58 	dsi_generic_write_seq(dsi, 0xfb, 0x01);
59 	dsi_generic_write_seq(dsi, 0xc5, 0x31);
60 	dsi_generic_write_seq(dsi, 0xff, 0x04);
61 	dsi_generic_write_seq(dsi, 0x01, 0x84);
62 	dsi_generic_write_seq(dsi, 0x05, 0x25);
63 	dsi_generic_write_seq(dsi, 0x06, 0x01);
64 	dsi_generic_write_seq(dsi, 0x07, 0x20);
65 	dsi_generic_write_seq(dsi, 0x08, 0x06);
66 	dsi_generic_write_seq(dsi, 0x09, 0x08);
67 	dsi_generic_write_seq(dsi, 0x0a, 0x10);
68 	dsi_generic_write_seq(dsi, 0x0b, 0x10);
69 	dsi_generic_write_seq(dsi, 0x0c, 0x10);
70 	dsi_generic_write_seq(dsi, 0x0d, 0x14);
71 	dsi_generic_write_seq(dsi, 0x0e, 0x14);
72 	dsi_generic_write_seq(dsi, 0x0f, 0x14);
73 	dsi_generic_write_seq(dsi, 0x10, 0x14);
74 	dsi_generic_write_seq(dsi, 0x11, 0x14);
75 	dsi_generic_write_seq(dsi, 0x12, 0x14);
76 	dsi_generic_write_seq(dsi, 0x17, 0xf3);
77 	dsi_generic_write_seq(dsi, 0x18, 0xc0);
78 	dsi_generic_write_seq(dsi, 0x19, 0xc0);
79 	dsi_generic_write_seq(dsi, 0x1a, 0xc0);
80 	dsi_generic_write_seq(dsi, 0x1b, 0xb3);
81 	dsi_generic_write_seq(dsi, 0x1c, 0xb3);
82 	dsi_generic_write_seq(dsi, 0x1d, 0xb3);
83 	dsi_generic_write_seq(dsi, 0x1e, 0xb3);
84 	dsi_generic_write_seq(dsi, 0x1f, 0xb3);
85 	dsi_generic_write_seq(dsi, 0x20, 0xb3);
86 	dsi_generic_write_seq(dsi, 0xfb, 0x01);
87 	dsi_generic_write_seq(dsi, 0xff, 0x00);
88 	dsi_generic_write_seq(dsi, 0xfb, 0x01);
89 	dsi_generic_write_seq(dsi, 0x35, 0x01);
90 	dsi_generic_write_seq(dsi, 0xd3, 0x06);
91 	dsi_generic_write_seq(dsi, 0xd4, 0x04);
92 	dsi_generic_write_seq(dsi, 0x5e, 0x0d);
93 	dsi_generic_write_seq(dsi, 0x11, 0x00);
94 	msleep(100);
95 	dsi_generic_write_seq(dsi, 0x29, 0x00);
96 	dsi_generic_write_seq(dsi, 0x53, 0x24);
97 
98 	return 0;
99 }
100 
tm5p5_nt35596_off(struct tm5p5_nt35596 * ctx)101 static int tm5p5_nt35596_off(struct tm5p5_nt35596 *ctx)
102 {
103 	struct mipi_dsi_device *dsi = ctx->dsi;
104 	struct device *dev = &dsi->dev;
105 	int ret;
106 
107 	ret = mipi_dsi_dcs_set_display_off(dsi);
108 	if (ret < 0) {
109 		dev_err(dev, "Failed to set display off: %d\n", ret);
110 		return ret;
111 	}
112 	msleep(60);
113 
114 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
115 	if (ret < 0) {
116 		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
117 		return ret;
118 	}
119 
120 	dsi_dcs_write_seq(dsi, 0x4f, 0x01);
121 
122 	return 0;
123 }
124 
tm5p5_nt35596_prepare(struct drm_panel * panel)125 static int tm5p5_nt35596_prepare(struct drm_panel *panel)
126 {
127 	struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
128 	struct device *dev = &ctx->dsi->dev;
129 	int ret;
130 
131 	if (ctx->prepared)
132 		return 0;
133 
134 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
135 	if (ret < 0) {
136 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
137 		return ret;
138 	}
139 
140 	tm5p5_nt35596_reset(ctx);
141 
142 	ret = tm5p5_nt35596_on(ctx);
143 	if (ret < 0) {
144 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
145 		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
146 		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
147 				       ctx->supplies);
148 		return ret;
149 	}
150 
151 	ctx->prepared = true;
152 	return 0;
153 }
154 
tm5p5_nt35596_unprepare(struct drm_panel * panel)155 static int tm5p5_nt35596_unprepare(struct drm_panel *panel)
156 {
157 	struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
158 	struct device *dev = &ctx->dsi->dev;
159 	int ret;
160 
161 	if (!ctx->prepared)
162 		return 0;
163 
164 	ret = tm5p5_nt35596_off(ctx);
165 	if (ret < 0)
166 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
167 
168 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
169 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
170 			       ctx->supplies);
171 
172 	ctx->prepared = false;
173 	return 0;
174 }
175 
176 static const struct drm_display_mode tm5p5_nt35596_mode = {
177 	.clock = (1080 + 100 + 8 + 16) * (1920 + 4 + 2 + 4) * 60 / 1000,
178 	.hdisplay = 1080,
179 	.hsync_start = 1080 + 100,
180 	.hsync_end = 1080 + 100 + 8,
181 	.htotal = 1080 + 100 + 8 + 16,
182 	.vdisplay = 1920,
183 	.vsync_start = 1920 + 4,
184 	.vsync_end = 1920 + 4 + 2,
185 	.vtotal = 1920 + 4 + 2 + 4,
186 	.width_mm = 68,
187 	.height_mm = 121,
188 };
189 
tm5p5_nt35596_get_modes(struct drm_panel * panel,struct drm_connector * connector)190 static int tm5p5_nt35596_get_modes(struct drm_panel *panel,
191 				   struct drm_connector *connector)
192 {
193 	struct drm_display_mode *mode;
194 
195 	mode = drm_mode_duplicate(connector->dev, &tm5p5_nt35596_mode);
196 	if (!mode)
197 		return -ENOMEM;
198 
199 	drm_mode_set_name(mode);
200 
201 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
202 	connector->display_info.width_mm = mode->width_mm;
203 	connector->display_info.height_mm = mode->height_mm;
204 	drm_mode_probed_add(connector, mode);
205 
206 	return 1;
207 }
208 
209 static const struct drm_panel_funcs tm5p5_nt35596_panel_funcs = {
210 	.prepare = tm5p5_nt35596_prepare,
211 	.unprepare = tm5p5_nt35596_unprepare,
212 	.get_modes = tm5p5_nt35596_get_modes,
213 };
214 
tm5p5_nt35596_bl_update_status(struct backlight_device * bl)215 static int tm5p5_nt35596_bl_update_status(struct backlight_device *bl)
216 {
217 	struct mipi_dsi_device *dsi = bl_get_data(bl);
218 	u16 brightness = bl->props.brightness;
219 	int ret;
220 
221 	if (bl->props.power != FB_BLANK_UNBLANK ||
222 	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
223 	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
224 		brightness = 0;
225 
226 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
227 
228 	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
229 	if (ret < 0)
230 		return ret;
231 
232 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
233 
234 	return 0;
235 }
236 
tm5p5_nt35596_bl_get_brightness(struct backlight_device * bl)237 static int tm5p5_nt35596_bl_get_brightness(struct backlight_device *bl)
238 {
239 	struct mipi_dsi_device *dsi = bl_get_data(bl);
240 	u16 brightness = bl->props.brightness;
241 	int ret;
242 
243 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
244 
245 	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
246 	if (ret < 0)
247 		return ret;
248 
249 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
250 
251 	return brightness & 0xff;
252 }
253 
254 static const struct backlight_ops tm5p5_nt35596_bl_ops = {
255 	.update_status = tm5p5_nt35596_bl_update_status,
256 	.get_brightness = tm5p5_nt35596_bl_get_brightness,
257 };
258 
259 static struct backlight_device *
tm5p5_nt35596_create_backlight(struct mipi_dsi_device * dsi)260 tm5p5_nt35596_create_backlight(struct mipi_dsi_device *dsi)
261 {
262 	struct device *dev = &dsi->dev;
263 	const struct backlight_properties props = {
264 		.type = BACKLIGHT_RAW,
265 		.brightness = 255,
266 		.max_brightness = 255,
267 	};
268 
269 	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
270 					      &tm5p5_nt35596_bl_ops, &props);
271 }
272 
tm5p5_nt35596_probe(struct mipi_dsi_device * dsi)273 static int tm5p5_nt35596_probe(struct mipi_dsi_device *dsi)
274 {
275 	struct device *dev = &dsi->dev;
276 	struct tm5p5_nt35596 *ctx;
277 	int ret;
278 
279 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
280 	if (!ctx)
281 		return -ENOMEM;
282 
283 	ctx->supplies[0].supply = "vdd";
284 	ctx->supplies[1].supply = "vddio";
285 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
286 				      ctx->supplies);
287 	if (ret < 0) {
288 		dev_err(dev, "Failed to get regulators: %d\n", ret);
289 		return ret;
290 	}
291 
292 	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
293 	if (IS_ERR(ctx->reset_gpio)) {
294 		ret = PTR_ERR(ctx->reset_gpio);
295 		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
296 		return ret;
297 	}
298 
299 	ctx->dsi = dsi;
300 	mipi_dsi_set_drvdata(dsi, ctx);
301 
302 	dsi->lanes = 4;
303 	dsi->format = MIPI_DSI_FMT_RGB888;
304 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
305 			  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_NO_EOT_PACKET |
306 			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
307 
308 	drm_panel_init(&ctx->panel, dev, &tm5p5_nt35596_panel_funcs,
309 		       DRM_MODE_CONNECTOR_DSI);
310 
311 	ctx->panel.backlight = tm5p5_nt35596_create_backlight(dsi);
312 	if (IS_ERR(ctx->panel.backlight)) {
313 		ret = PTR_ERR(ctx->panel.backlight);
314 		dev_err(dev, "Failed to create backlight: %d\n", ret);
315 		return ret;
316 	}
317 
318 	drm_panel_add(&ctx->panel);
319 
320 	ret = mipi_dsi_attach(dsi);
321 	if (ret < 0) {
322 		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
323 		return ret;
324 	}
325 
326 	return 0;
327 }
328 
tm5p5_nt35596_remove(struct mipi_dsi_device * dsi)329 static int tm5p5_nt35596_remove(struct mipi_dsi_device *dsi)
330 {
331 	struct tm5p5_nt35596 *ctx = mipi_dsi_get_drvdata(dsi);
332 	int ret;
333 
334 	ret = mipi_dsi_detach(dsi);
335 	if (ret < 0)
336 		dev_err(&dsi->dev,
337 			"Failed to detach from DSI host: %d\n", ret);
338 
339 	drm_panel_remove(&ctx->panel);
340 
341 	return 0;
342 }
343 
344 static const struct of_device_id tm5p5_nt35596_of_match[] = {
345 	{ .compatible = "asus,z00t-tm5p5-n35596" },
346 	{ /* sentinel */ }
347 };
348 MODULE_DEVICE_TABLE(of, tm5p5_nt35596_of_match);
349 
350 static struct mipi_dsi_driver tm5p5_nt35596_driver = {
351 	.probe = tm5p5_nt35596_probe,
352 	.remove = tm5p5_nt35596_remove,
353 	.driver = {
354 		.name = "panel-tm5p5-nt35596",
355 		.of_match_table = tm5p5_nt35596_of_match,
356 	},
357 };
358 module_mipi_dsi_driver(tm5p5_nt35596_driver);
359 
360 MODULE_AUTHOR("Konrad Dybcio <konradybcio@gmail.com>");
361 MODULE_DESCRIPTION("DRM driver for tm5p5 nt35596 1080p video mode dsi panel");
362 MODULE_LICENSE("GPL v2");
363