1
2
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);
58 dsi_dcs_write_seq(dsi, 0xcc, 0x4c);
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
68 dsi_dcs_write_seq(dsi, 0xca,
69 0x01, 0x00, 0x01, 0x00, 0x01, 0x00,
70 0x80, 0x80, 0x80,
71 0x80, 0x80, 0x80,
72 0x80, 0x80, 0x80,
73 0x80, 0x80, 0x80,
74 0x80, 0x80, 0x80,
75 0x80, 0x80, 0x80,
76 0x80, 0x80, 0x80,
77 0x6b, 0x68, 0x71,
78 0x00, 0x00, 0x00);
79
80 dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
81 dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b);
82 dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
83 dsi_dcs_write_seq(dsi, 0xf7, 0x03);
84 dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
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 { },
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");
289
