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	bool prepared;
 23};
 24
 25static inline struct
 26s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
 27{
 28	return container_of(panel, struct s6e88a0_ams452ef01, panel);
 29}
 30
 31#define dsi_dcs_write_seq(dsi, seq...) do {				\
 32		static const u8 d[] = { seq };				\
 33		int ret;						\
 34		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
 35		if (ret < 0)						\
 36			return ret;					\
 37	} while (0)
 38
 39static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
 40{
 41	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 42	usleep_range(5000, 6000);
 43	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 44	usleep_range(1000, 2000);
 45	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 46	usleep_range(10000, 11000);
 47}
 48
 49static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
 50{
 51	struct mipi_dsi_device *dsi = ctx->dsi;
 52	struct device *dev = &dsi->dev;
 53	int ret;
 54
 55	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 56
 57	dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
 58	dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
 59
 60	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 61	if (ret < 0) {
 62		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
 63		return ret;
 64	}
 65	msleep(120);
 66
 67	// set default brightness/gama
 68	dsi_dcs_write_seq(dsi, 0xca,
 69			  0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
 70			  0x80, 0x80, 0x80,			// V203 R,G,B
 71			  0x80, 0x80, 0x80,			// V151 R,G,B
 72			  0x80, 0x80, 0x80,			// V87  R,G,B
 73			  0x80, 0x80, 0x80,			// V51  R,G,B
 74			  0x80, 0x80, 0x80,			// V35  R,G,B
 75			  0x80, 0x80, 0x80,			// V23  R,G,B
 76			  0x80, 0x80, 0x80,			// V11  R,G,B
 77			  0x6b, 0x68, 0x71,			// V3   R,G,B
 78			  0x00, 0x00, 0x00);			// V1   R,G,B
 79	// set default Amoled Off Ratio
 80	dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
 81	dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
 82	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
 83	dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
 84	dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
 85
 86	ret = mipi_dsi_dcs_set_display_on(dsi);
 87	if (ret < 0) {
 88		dev_err(dev, "Failed to set display on: %d\n", ret);
 89		return ret;
 90	}
 91
 92	return 0;
 93}
 94
 95static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
 96{
 97	struct mipi_dsi_device *dsi = ctx->dsi;
 98	struct device *dev = &dsi->dev;
 99	int ret;
100
101	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
102
103	ret = mipi_dsi_dcs_set_display_off(dsi);
104	if (ret < 0) {
105		dev_err(dev, "Failed to set display off: %d\n", ret);
106		return ret;
107	}
108	msleep(35);
109
110	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
111	if (ret < 0) {
112		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
113		return ret;
114	}
115	msleep(120);
116
117	return 0;
118}
119
120static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
121{
122	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
123	struct device *dev = &ctx->dsi->dev;
124	int ret;
125
126	if (ctx->prepared)
127		return 0;
128
129	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
130	if (ret < 0) {
131		dev_err(dev, "Failed to enable regulators: %d\n", ret);
132		return ret;
133	}
134
135	s6e88a0_ams452ef01_reset(ctx);
136
137	ret = s6e88a0_ams452ef01_on(ctx);
138	if (ret < 0) {
139		dev_err(dev, "Failed to initialize panel: %d\n", ret);
140		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
141		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
142				       ctx->supplies);
143		return ret;
144	}
145
146	ctx->prepared = true;
147	return 0;
148}
149
150static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
151{
152	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
153	struct device *dev = &ctx->dsi->dev;
154	int ret;
155
156	if (!ctx->prepared)
157		return 0;
158
159	ret = s6e88a0_ams452ef01_off(ctx);
160	if (ret < 0)
161		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
162
163	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
164	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
165
166	ctx->prepared = false;
167	return 0;
168}
169
170static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
171	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
172	.hdisplay = 540,
173	.hsync_start = 540 + 88,
174	.hsync_end = 540 + 88 + 4,
175	.htotal = 540 + 88 + 4 + 20,
176	.vdisplay = 960,
177	.vsync_start = 960 + 14,
178	.vsync_end = 960 + 14 + 2,
179	.vtotal = 960 + 14 + 2 + 8,
180	.width_mm = 56,
181	.height_mm = 100,
182};
183
184static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
185					struct drm_connector *connector)
186{
187	struct drm_display_mode *mode;
188
189	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
190	if (!mode)
191		return -ENOMEM;
192
193	drm_mode_set_name(mode);
194
195	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
196	connector->display_info.width_mm = mode->width_mm;
197	connector->display_info.height_mm = mode->height_mm;
198	drm_mode_probed_add(connector, mode);
199
200	return 1;
201}
202
203static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
204	.unprepare = s6e88a0_ams452ef01_unprepare,
205	.prepare = s6e88a0_ams452ef01_prepare,
206	.get_modes = s6e88a0_ams452ef01_get_modes,
207};
208
209static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
210{
211	struct device *dev = &dsi->dev;
212	struct s6e88a0_ams452ef01 *ctx;
213	int ret;
214
215	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
216	if (!ctx)
217		return -ENOMEM;
218
219	ctx->supplies[0].supply = "vdd3";
220	ctx->supplies[1].supply = "vci";
221	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
222				      ctx->supplies);
223	if (ret < 0) {
224		dev_err(dev, "Failed to get regulators: %d\n", ret);
225		return ret;
226	}
227
228	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
229	if (IS_ERR(ctx->reset_gpio)) {
230		ret = PTR_ERR(ctx->reset_gpio);
231		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
232		return ret;
233	}
234
235	ctx->dsi = dsi;
236	mipi_dsi_set_drvdata(dsi, ctx);
237
238	dsi->lanes = 2;
239	dsi->format = MIPI_DSI_FMT_RGB888;
240	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
241
242	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
243		       DRM_MODE_CONNECTOR_DSI);
244
245	drm_panel_add(&ctx->panel);
246
247	ret = mipi_dsi_attach(dsi);
248	if (ret < 0) {
249		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
250		return ret;
251	}
252
253	return 0;
254}
255
256static int s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
257{
258	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
259	int ret;
260
261	ret = mipi_dsi_detach(dsi);
262	if (ret < 0)
263		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
264
265	drm_panel_remove(&ctx->panel);
266
267	return 0;
268}
269
270static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
271	{ .compatible = "samsung,s6e88a0-ams452ef01" },
272	{ /* sentinel */ },
273};
274MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
275
276static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
277	.probe = s6e88a0_ams452ef01_probe,
278	.remove = s6e88a0_ams452ef01_remove,
279	.driver = {
280		.name = "panel-s6e88a0-ams452ef01",
281		.of_match_table = s6e88a0_ams452ef01_of_match,
282	},
283};
284module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
285
286MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
287MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
288MODULE_LICENSE("GPL v2");