1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2019, Michael Srba
3
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 <video/mipi_display.h>
11
12#include <drm/drm_mipi_dsi.h>
13#include <drm/drm_modes.h>
14#include <drm/drm_panel.h>
15
16struct s6e88a0_ams452ef01 {
17	struct drm_panel panel;
18	struct mipi_dsi_device *dsi;
19	struct regulator_bulk_data supplies[2];
20	struct gpio_desc *reset_gpio;
21};
22
23static inline struct
24s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
25{
26	return container_of(panel, struct s6e88a0_ams452ef01, panel);
27}
28
29static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
30{
31	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
32	usleep_range(5000, 6000);
33	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
34	usleep_range(1000, 2000);
35	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
36	usleep_range(10000, 11000);
37}
38
39static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
40{
41	struct mipi_dsi_device *dsi = ctx->dsi;
42	struct device *dev = &dsi->dev;
43	int ret;
44
45	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
46
47	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
48	mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
49
50	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
51	if (ret < 0) {
52		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
53		return ret;
54	}
55	msleep(120);
56
57	// set default brightness/gama
58	mipi_dsi_dcs_write_seq(dsi, 0xca,
59			       0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
60			       0x80, 0x80, 0x80,			// V203 R,G,B
61			       0x80, 0x80, 0x80,			// V151 R,G,B
62			       0x80, 0x80, 0x80,			// V87  R,G,B
63			       0x80, 0x80, 0x80,			// V51  R,G,B
64			       0x80, 0x80, 0x80,			// V35  R,G,B
65			       0x80, 0x80, 0x80,			// V23  R,G,B
66			       0x80, 0x80, 0x80,			// V11  R,G,B
67			       0x6b, 0x68, 0x71,			// V3   R,G,B
68			       0x00, 0x00, 0x00);			// V1   R,G,B
69	// set default Amoled Off Ratio
70	mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
71	mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
72	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
73	mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
74	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
75
76	ret = mipi_dsi_dcs_set_display_on(dsi);
77	if (ret < 0) {
78		dev_err(dev, "Failed to set display on: %d\n", ret);
79		return ret;
80	}
81
82	return 0;
83}
84
85static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
86{
87	struct mipi_dsi_device *dsi = ctx->dsi;
88	struct device *dev = &dsi->dev;
89	int ret;
90
91	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
92
93	ret = mipi_dsi_dcs_set_display_off(dsi);
94	if (ret < 0) {
95		dev_err(dev, "Failed to set display off: %d\n", ret);
96		return ret;
97	}
98	msleep(35);
99
100	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
101	if (ret < 0) {
102		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
103		return ret;
104	}
105	msleep(120);
106
107	return 0;
108}
109
110static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
111{
112	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
113	struct device *dev = &ctx->dsi->dev;
114	int ret;
115
116	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
117	if (ret < 0) {
118		dev_err(dev, "Failed to enable regulators: %d\n", ret);
119		return ret;
120	}
121
122	s6e88a0_ams452ef01_reset(ctx);
123
124	ret = s6e88a0_ams452ef01_on(ctx);
125	if (ret < 0) {
126		dev_err(dev, "Failed to initialize panel: %d\n", ret);
127		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
128		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
129				       ctx->supplies);
130		return ret;
131	}
132
133	return 0;
134}
135
136static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
137{
138	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
139	struct device *dev = &ctx->dsi->dev;
140	int ret;
141
142	ret = s6e88a0_ams452ef01_off(ctx);
143	if (ret < 0)
144		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
145
146	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
147	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
148
149	return 0;
150}
151
152static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
153	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
154	.hdisplay = 540,
155	.hsync_start = 540 + 88,
156	.hsync_end = 540 + 88 + 4,
157	.htotal = 540 + 88 + 4 + 20,
158	.vdisplay = 960,
159	.vsync_start = 960 + 14,
160	.vsync_end = 960 + 14 + 2,
161	.vtotal = 960 + 14 + 2 + 8,
162	.width_mm = 56,
163	.height_mm = 100,
164};
165
166static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
167					struct drm_connector *connector)
168{
169	struct drm_display_mode *mode;
170
171	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
172	if (!mode)
173		return -ENOMEM;
174
175	drm_mode_set_name(mode);
176
177	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
178	connector->display_info.width_mm = mode->width_mm;
179	connector->display_info.height_mm = mode->height_mm;
180	drm_mode_probed_add(connector, mode);
181
182	return 1;
183}
184
185static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
186	.unprepare = s6e88a0_ams452ef01_unprepare,
187	.prepare = s6e88a0_ams452ef01_prepare,
188	.get_modes = s6e88a0_ams452ef01_get_modes,
189};
190
191static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
192{
193	struct device *dev = &dsi->dev;
194	struct s6e88a0_ams452ef01 *ctx;
195	int ret;
196
197	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
198	if (!ctx)
199		return -ENOMEM;
200
201	ctx->supplies[0].supply = "vdd3";
202	ctx->supplies[1].supply = "vci";
203	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
204				      ctx->supplies);
205	if (ret < 0) {
206		dev_err(dev, "Failed to get regulators: %d\n", ret);
207		return ret;
208	}
209
210	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
211	if (IS_ERR(ctx->reset_gpio)) {
212		ret = PTR_ERR(ctx->reset_gpio);
213		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
214		return ret;
215	}
216
217	ctx->dsi = dsi;
218	mipi_dsi_set_drvdata(dsi, ctx);
219
220	dsi->lanes = 2;
221	dsi->format = MIPI_DSI_FMT_RGB888;
222	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
223
224	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
225		       DRM_MODE_CONNECTOR_DSI);
226
227	drm_panel_add(&ctx->panel);
228
229	ret = mipi_dsi_attach(dsi);
230	if (ret < 0) {
231		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
232		drm_panel_remove(&ctx->panel);
233		return ret;
234	}
235
236	return 0;
237}
238
239static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
240{
241	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
242	int ret;
243
244	ret = mipi_dsi_detach(dsi);
245	if (ret < 0)
246		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
247
248	drm_panel_remove(&ctx->panel);
249}
250
251static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
252	{ .compatible = "samsung,s6e88a0-ams452ef01" },
253	{ /* sentinel */ },
254};
255MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
256
257static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
258	.probe = s6e88a0_ams452ef01_probe,
259	.remove = s6e88a0_ams452ef01_remove,
260	.driver = {
261		.name = "panel-s6e88a0-ams452ef01",
262		.of_match_table = s6e88a0_ams452ef01_of_match,
263	},
264};
265module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
266
267MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
268MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
269MODULE_LICENSE("GPL v2");
270