1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017-2018, Bootlin
4 */
5
6 #include <linux/backlight.h>
7 #include <linux/delay.h>
8 #include <linux/device.h>
9 #include <linux/err.h>
10 #include <linux/errno.h>
11 #include <linux/fb.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14
15 #include <linux/gpio/consumer.h>
16 #include <linux/regulator/consumer.h>
17
18 #include <drm/drm_mipi_dsi.h>
19 #include <drm/drm_modes.h>
20 #include <drm/drm_panel.h>
21
22 #include <video/mipi_display.h>
23
24 struct ili9881c {
25 struct drm_panel panel;
26 struct mipi_dsi_device *dsi;
27
28 struct backlight_device *backlight;
29 struct regulator *power;
30 struct gpio_desc *reset;
31 };
32
33 enum ili9881c_op {
34 ILI9881C_SWITCH_PAGE,
35 ILI9881C_COMMAND,
36 };
37
38 struct ili9881c_instr {
39 enum ili9881c_op op;
40
41 union arg {
42 struct cmd {
43 u8 cmd;
44 u8 data;
45 } cmd;
46 u8 page;
47 } arg;
48 };
49
50 #define ILI9881C_SWITCH_PAGE_INSTR(_page) \
51 { \
52 .op = ILI9881C_SWITCH_PAGE, \
53 .arg = { \
54 .page = (_page), \
55 }, \
56 }
57
58 #define ILI9881C_COMMAND_INSTR(_cmd, _data) \
59 { \
60 .op = ILI9881C_COMMAND, \
61 .arg = { \
62 .cmd = { \
63 .cmd = (_cmd), \
64 .data = (_data), \
65 }, \
66 }, \
67 }
68
69 static const struct ili9881c_instr ili9881c_init[] = {
70 ILI9881C_SWITCH_PAGE_INSTR(3),
71 ILI9881C_COMMAND_INSTR(0x01, 0x00),
72 ILI9881C_COMMAND_INSTR(0x02, 0x00),
73 ILI9881C_COMMAND_INSTR(0x03, 0x73),
74 ILI9881C_COMMAND_INSTR(0x04, 0x03),
75 ILI9881C_COMMAND_INSTR(0x05, 0x00),
76 ILI9881C_COMMAND_INSTR(0x06, 0x06),
77 ILI9881C_COMMAND_INSTR(0x07, 0x06),
78 ILI9881C_COMMAND_INSTR(0x08, 0x00),
79 ILI9881C_COMMAND_INSTR(0x09, 0x18),
80 ILI9881C_COMMAND_INSTR(0x0a, 0x04),
81 ILI9881C_COMMAND_INSTR(0x0b, 0x00),
82 ILI9881C_COMMAND_INSTR(0x0c, 0x02),
83 ILI9881C_COMMAND_INSTR(0x0d, 0x03),
84 ILI9881C_COMMAND_INSTR(0x0e, 0x00),
85 ILI9881C_COMMAND_INSTR(0x0f, 0x25),
86 ILI9881C_COMMAND_INSTR(0x10, 0x25),
87 ILI9881C_COMMAND_INSTR(0x11, 0x00),
88 ILI9881C_COMMAND_INSTR(0x12, 0x00),
89 ILI9881C_COMMAND_INSTR(0x13, 0x00),
90 ILI9881C_COMMAND_INSTR(0x14, 0x00),
91 ILI9881C_COMMAND_INSTR(0x15, 0x00),
92 ILI9881C_COMMAND_INSTR(0x16, 0x0C),
93 ILI9881C_COMMAND_INSTR(0x17, 0x00),
94 ILI9881C_COMMAND_INSTR(0x18, 0x00),
95 ILI9881C_COMMAND_INSTR(0x19, 0x00),
96 ILI9881C_COMMAND_INSTR(0x1a, 0x00),
97 ILI9881C_COMMAND_INSTR(0x1b, 0x00),
98 ILI9881C_COMMAND_INSTR(0x1c, 0x00),
99 ILI9881C_COMMAND_INSTR(0x1d, 0x00),
100 ILI9881C_COMMAND_INSTR(0x1e, 0xC0),
101 ILI9881C_COMMAND_INSTR(0x1f, 0x80),
102 ILI9881C_COMMAND_INSTR(0x20, 0x04),
103 ILI9881C_COMMAND_INSTR(0x21, 0x01),
104 ILI9881C_COMMAND_INSTR(0x22, 0x00),
105 ILI9881C_COMMAND_INSTR(0x23, 0x00),
106 ILI9881C_COMMAND_INSTR(0x24, 0x00),
107 ILI9881C_COMMAND_INSTR(0x25, 0x00),
108 ILI9881C_COMMAND_INSTR(0x26, 0x00),
109 ILI9881C_COMMAND_INSTR(0x27, 0x00),
110 ILI9881C_COMMAND_INSTR(0x28, 0x33),
111 ILI9881C_COMMAND_INSTR(0x29, 0x03),
112 ILI9881C_COMMAND_INSTR(0x2a, 0x00),
113 ILI9881C_COMMAND_INSTR(0x2b, 0x00),
114 ILI9881C_COMMAND_INSTR(0x2c, 0x00),
115 ILI9881C_COMMAND_INSTR(0x2d, 0x00),
116 ILI9881C_COMMAND_INSTR(0x2e, 0x00),
117 ILI9881C_COMMAND_INSTR(0x2f, 0x00),
118 ILI9881C_COMMAND_INSTR(0x30, 0x00),
119 ILI9881C_COMMAND_INSTR(0x31, 0x00),
120 ILI9881C_COMMAND_INSTR(0x32, 0x00),
121 ILI9881C_COMMAND_INSTR(0x33, 0x00),
122 ILI9881C_COMMAND_INSTR(0x34, 0x04),
123 ILI9881C_COMMAND_INSTR(0x35, 0x00),
124 ILI9881C_COMMAND_INSTR(0x36, 0x00),
125 ILI9881C_COMMAND_INSTR(0x37, 0x00),
126 ILI9881C_COMMAND_INSTR(0x38, 0x3C),
127 ILI9881C_COMMAND_INSTR(0x39, 0x00),
128 ILI9881C_COMMAND_INSTR(0x3a, 0x00),
129 ILI9881C_COMMAND_INSTR(0x3b, 0x00),
130 ILI9881C_COMMAND_INSTR(0x3c, 0x00),
131 ILI9881C_COMMAND_INSTR(0x3d, 0x00),
132 ILI9881C_COMMAND_INSTR(0x3e, 0x00),
133 ILI9881C_COMMAND_INSTR(0x3f, 0x00),
134 ILI9881C_COMMAND_INSTR(0x40, 0x00),
135 ILI9881C_COMMAND_INSTR(0x41, 0x00),
136 ILI9881C_COMMAND_INSTR(0x42, 0x00),
137 ILI9881C_COMMAND_INSTR(0x43, 0x00),
138 ILI9881C_COMMAND_INSTR(0x44, 0x00),
139 ILI9881C_COMMAND_INSTR(0x50, 0x01),
140 ILI9881C_COMMAND_INSTR(0x51, 0x23),
141 ILI9881C_COMMAND_INSTR(0x52, 0x45),
142 ILI9881C_COMMAND_INSTR(0x53, 0x67),
143 ILI9881C_COMMAND_INSTR(0x54, 0x89),
144 ILI9881C_COMMAND_INSTR(0x55, 0xab),
145 ILI9881C_COMMAND_INSTR(0x56, 0x01),
146 ILI9881C_COMMAND_INSTR(0x57, 0x23),
147 ILI9881C_COMMAND_INSTR(0x58, 0x45),
148 ILI9881C_COMMAND_INSTR(0x59, 0x67),
149 ILI9881C_COMMAND_INSTR(0x5a, 0x89),
150 ILI9881C_COMMAND_INSTR(0x5b, 0xab),
151 ILI9881C_COMMAND_INSTR(0x5c, 0xcd),
152 ILI9881C_COMMAND_INSTR(0x5d, 0xef),
153 ILI9881C_COMMAND_INSTR(0x5e, 0x11),
154 ILI9881C_COMMAND_INSTR(0x5f, 0x02),
155 ILI9881C_COMMAND_INSTR(0x60, 0x02),
156 ILI9881C_COMMAND_INSTR(0x61, 0x02),
157 ILI9881C_COMMAND_INSTR(0x62, 0x02),
158 ILI9881C_COMMAND_INSTR(0x63, 0x02),
159 ILI9881C_COMMAND_INSTR(0x64, 0x02),
160 ILI9881C_COMMAND_INSTR(0x65, 0x02),
161 ILI9881C_COMMAND_INSTR(0x66, 0x02),
162 ILI9881C_COMMAND_INSTR(0x67, 0x02),
163 ILI9881C_COMMAND_INSTR(0x68, 0x02),
164 ILI9881C_COMMAND_INSTR(0x69, 0x02),
165 ILI9881C_COMMAND_INSTR(0x6a, 0x0C),
166 ILI9881C_COMMAND_INSTR(0x6b, 0x02),
167 ILI9881C_COMMAND_INSTR(0x6c, 0x0F),
168 ILI9881C_COMMAND_INSTR(0x6d, 0x0E),
169 ILI9881C_COMMAND_INSTR(0x6e, 0x0D),
170 ILI9881C_COMMAND_INSTR(0x6f, 0x06),
171 ILI9881C_COMMAND_INSTR(0x70, 0x07),
172 ILI9881C_COMMAND_INSTR(0x71, 0x02),
173 ILI9881C_COMMAND_INSTR(0x72, 0x02),
174 ILI9881C_COMMAND_INSTR(0x73, 0x02),
175 ILI9881C_COMMAND_INSTR(0x74, 0x02),
176 ILI9881C_COMMAND_INSTR(0x75, 0x02),
177 ILI9881C_COMMAND_INSTR(0x76, 0x02),
178 ILI9881C_COMMAND_INSTR(0x77, 0x02),
179 ILI9881C_COMMAND_INSTR(0x78, 0x02),
180 ILI9881C_COMMAND_INSTR(0x79, 0x02),
181 ILI9881C_COMMAND_INSTR(0x7a, 0x02),
182 ILI9881C_COMMAND_INSTR(0x7b, 0x02),
183 ILI9881C_COMMAND_INSTR(0x7c, 0x02),
184 ILI9881C_COMMAND_INSTR(0x7d, 0x02),
185 ILI9881C_COMMAND_INSTR(0x7e, 0x02),
186 ILI9881C_COMMAND_INSTR(0x7f, 0x02),
187 ILI9881C_COMMAND_INSTR(0x80, 0x0C),
188 ILI9881C_COMMAND_INSTR(0x81, 0x02),
189 ILI9881C_COMMAND_INSTR(0x82, 0x0F),
190 ILI9881C_COMMAND_INSTR(0x83, 0x0E),
191 ILI9881C_COMMAND_INSTR(0x84, 0x0D),
192 ILI9881C_COMMAND_INSTR(0x85, 0x06),
193 ILI9881C_COMMAND_INSTR(0x86, 0x07),
194 ILI9881C_COMMAND_INSTR(0x87, 0x02),
195 ILI9881C_COMMAND_INSTR(0x88, 0x02),
196 ILI9881C_COMMAND_INSTR(0x89, 0x02),
197 ILI9881C_COMMAND_INSTR(0x8A, 0x02),
198 ILI9881C_SWITCH_PAGE_INSTR(4),
199 ILI9881C_COMMAND_INSTR(0x6C, 0x15),
200 ILI9881C_COMMAND_INSTR(0x6E, 0x22),
201 ILI9881C_COMMAND_INSTR(0x6F, 0x33),
202 ILI9881C_COMMAND_INSTR(0x3A, 0xA4),
203 ILI9881C_COMMAND_INSTR(0x8D, 0x0D),
204 ILI9881C_COMMAND_INSTR(0x87, 0xBA),
205 ILI9881C_COMMAND_INSTR(0x26, 0x76),
206 ILI9881C_COMMAND_INSTR(0xB2, 0xD1),
207 ILI9881C_SWITCH_PAGE_INSTR(1),
208 ILI9881C_COMMAND_INSTR(0x22, 0x0A),
209 ILI9881C_COMMAND_INSTR(0x53, 0xDC),
210 ILI9881C_COMMAND_INSTR(0x55, 0xA7),
211 ILI9881C_COMMAND_INSTR(0x50, 0x78),
212 ILI9881C_COMMAND_INSTR(0x51, 0x78),
213 ILI9881C_COMMAND_INSTR(0x31, 0x02),
214 ILI9881C_COMMAND_INSTR(0x60, 0x14),
215 ILI9881C_COMMAND_INSTR(0xA0, 0x2A),
216 ILI9881C_COMMAND_INSTR(0xA1, 0x39),
217 ILI9881C_COMMAND_INSTR(0xA2, 0x46),
218 ILI9881C_COMMAND_INSTR(0xA3, 0x0e),
219 ILI9881C_COMMAND_INSTR(0xA4, 0x12),
220 ILI9881C_COMMAND_INSTR(0xA5, 0x25),
221 ILI9881C_COMMAND_INSTR(0xA6, 0x19),
222 ILI9881C_COMMAND_INSTR(0xA7, 0x1d),
223 ILI9881C_COMMAND_INSTR(0xA8, 0xa6),
224 ILI9881C_COMMAND_INSTR(0xA9, 0x1C),
225 ILI9881C_COMMAND_INSTR(0xAA, 0x29),
226 ILI9881C_COMMAND_INSTR(0xAB, 0x85),
227 ILI9881C_COMMAND_INSTR(0xAC, 0x1C),
228 ILI9881C_COMMAND_INSTR(0xAD, 0x1B),
229 ILI9881C_COMMAND_INSTR(0xAE, 0x51),
230 ILI9881C_COMMAND_INSTR(0xAF, 0x22),
231 ILI9881C_COMMAND_INSTR(0xB0, 0x2d),
232 ILI9881C_COMMAND_INSTR(0xB1, 0x4f),
233 ILI9881C_COMMAND_INSTR(0xB2, 0x59),
234 ILI9881C_COMMAND_INSTR(0xB3, 0x3F),
235 ILI9881C_COMMAND_INSTR(0xC0, 0x2A),
236 ILI9881C_COMMAND_INSTR(0xC1, 0x3a),
237 ILI9881C_COMMAND_INSTR(0xC2, 0x45),
238 ILI9881C_COMMAND_INSTR(0xC3, 0x0e),
239 ILI9881C_COMMAND_INSTR(0xC4, 0x11),
240 ILI9881C_COMMAND_INSTR(0xC5, 0x24),
241 ILI9881C_COMMAND_INSTR(0xC6, 0x1a),
242 ILI9881C_COMMAND_INSTR(0xC7, 0x1c),
243 ILI9881C_COMMAND_INSTR(0xC8, 0xaa),
244 ILI9881C_COMMAND_INSTR(0xC9, 0x1C),
245 ILI9881C_COMMAND_INSTR(0xCA, 0x29),
246 ILI9881C_COMMAND_INSTR(0xCB, 0x96),
247 ILI9881C_COMMAND_INSTR(0xCC, 0x1C),
248 ILI9881C_COMMAND_INSTR(0xCD, 0x1B),
249 ILI9881C_COMMAND_INSTR(0xCE, 0x51),
250 ILI9881C_COMMAND_INSTR(0xCF, 0x22),
251 ILI9881C_COMMAND_INSTR(0xD0, 0x2b),
252 ILI9881C_COMMAND_INSTR(0xD1, 0x4b),
253 ILI9881C_COMMAND_INSTR(0xD2, 0x59),
254 ILI9881C_COMMAND_INSTR(0xD3, 0x3F),
255 };
256
panel_to_ili9881c(struct drm_panel * panel)257 static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel)
258 {
259 return container_of(panel, struct ili9881c, panel);
260 }
261
262 /*
263 * The panel seems to accept some private DCS commands that map
264 * directly to registers.
265 *
266 * It is organised by page, with each page having its own set of
267 * registers, and the first page looks like it's holding the standard
268 * DCS commands.
269 *
270 * So before any attempt at sending a command or data, we have to be
271 * sure if we're in the right page or not.
272 */
ili9881c_switch_page(struct ili9881c * ctx,u8 page)273 static int ili9881c_switch_page(struct ili9881c *ctx, u8 page)
274 {
275 u8 buf[4] = { 0xff, 0x98, 0x81, page };
276 int ret;
277
278 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
279 if (ret < 0)
280 return ret;
281
282 return 0;
283 }
284
ili9881c_send_cmd_data(struct ili9881c * ctx,u8 cmd,u8 data)285 static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data)
286 {
287 u8 buf[2] = { cmd, data };
288 int ret;
289
290 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
291 if (ret < 0)
292 return ret;
293
294 return 0;
295 }
296
ili9881c_prepare(struct drm_panel * panel)297 static int ili9881c_prepare(struct drm_panel *panel)
298 {
299 struct ili9881c *ctx = panel_to_ili9881c(panel);
300 unsigned int i;
301 int ret;
302
303 /* Power the panel */
304 ret = regulator_enable(ctx->power);
305 if (ret)
306 return ret;
307 msleep(5);
308
309 /* And reset it */
310 gpiod_set_value(ctx->reset, 1);
311 msleep(20);
312
313 gpiod_set_value(ctx->reset, 0);
314 msleep(20);
315
316 for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) {
317 const struct ili9881c_instr *instr = &ili9881c_init[i];
318
319 if (instr->op == ILI9881C_SWITCH_PAGE)
320 ret = ili9881c_switch_page(ctx, instr->arg.page);
321 else if (instr->op == ILI9881C_COMMAND)
322 ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd,
323 instr->arg.cmd.data);
324
325 if (ret)
326 return ret;
327 }
328
329 ret = ili9881c_switch_page(ctx, 0);
330 if (ret)
331 return ret;
332
333 ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
334 if (ret)
335 return ret;
336
337 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
338 if (ret)
339 return ret;
340
341 return 0;
342 }
343
ili9881c_enable(struct drm_panel * panel)344 static int ili9881c_enable(struct drm_panel *panel)
345 {
346 struct ili9881c *ctx = panel_to_ili9881c(panel);
347
348 msleep(120);
349
350 mipi_dsi_dcs_set_display_on(ctx->dsi);
351 backlight_enable(ctx->backlight);
352
353 return 0;
354 }
355
ili9881c_disable(struct drm_panel * panel)356 static int ili9881c_disable(struct drm_panel *panel)
357 {
358 struct ili9881c *ctx = panel_to_ili9881c(panel);
359
360 backlight_disable(ctx->backlight);
361 return mipi_dsi_dcs_set_display_off(ctx->dsi);
362 }
363
ili9881c_unprepare(struct drm_panel * panel)364 static int ili9881c_unprepare(struct drm_panel *panel)
365 {
366 struct ili9881c *ctx = panel_to_ili9881c(panel);
367
368 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
369 regulator_disable(ctx->power);
370 gpiod_set_value(ctx->reset, 1);
371
372 return 0;
373 }
374
375 static const struct drm_display_mode bananapi_default_mode = {
376 .clock = 62000,
377 .vrefresh = 60,
378
379 .hdisplay = 720,
380 .hsync_start = 720 + 10,
381 .hsync_end = 720 + 10 + 20,
382 .htotal = 720 + 10 + 20 + 30,
383
384 .vdisplay = 1280,
385 .vsync_start = 1280 + 10,
386 .vsync_end = 1280 + 10 + 10,
387 .vtotal = 1280 + 10 + 10 + 20,
388 };
389
ili9881c_get_modes(struct drm_panel * panel)390 static int ili9881c_get_modes(struct drm_panel *panel)
391 {
392 struct drm_connector *connector = panel->connector;
393 struct ili9881c *ctx = panel_to_ili9881c(panel);
394 struct drm_display_mode *mode;
395
396 mode = drm_mode_duplicate(panel->drm, &bananapi_default_mode);
397 if (!mode) {
398 dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
399 bananapi_default_mode.hdisplay,
400 bananapi_default_mode.vdisplay,
401 bananapi_default_mode.vrefresh);
402 return -ENOMEM;
403 }
404
405 drm_mode_set_name(mode);
406
407 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
408 drm_mode_probed_add(connector, mode);
409
410 panel->connector->display_info.width_mm = 62;
411 panel->connector->display_info.height_mm = 110;
412
413 return 1;
414 }
415
416 static const struct drm_panel_funcs ili9881c_funcs = {
417 .prepare = ili9881c_prepare,
418 .unprepare = ili9881c_unprepare,
419 .enable = ili9881c_enable,
420 .disable = ili9881c_disable,
421 .get_modes = ili9881c_get_modes,
422 };
423
ili9881c_dsi_probe(struct mipi_dsi_device * dsi)424 static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
425 {
426 struct device_node *np;
427 struct ili9881c *ctx;
428 int ret;
429
430 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
431 if (!ctx)
432 return -ENOMEM;
433 mipi_dsi_set_drvdata(dsi, ctx);
434 ctx->dsi = dsi;
435
436 drm_panel_init(&ctx->panel);
437 ctx->panel.dev = &dsi->dev;
438 ctx->panel.funcs = &ili9881c_funcs;
439
440 ctx->power = devm_regulator_get(&dsi->dev, "power");
441 if (IS_ERR(ctx->power)) {
442 dev_err(&dsi->dev, "Couldn't get our power regulator\n");
443 return PTR_ERR(ctx->power);
444 }
445
446 ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
447 if (IS_ERR(ctx->reset)) {
448 dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
449 return PTR_ERR(ctx->reset);
450 }
451
452 np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
453 if (np) {
454 ctx->backlight = of_find_backlight_by_node(np);
455 of_node_put(np);
456
457 if (!ctx->backlight)
458 return -EPROBE_DEFER;
459 }
460
461 ret = drm_panel_add(&ctx->panel);
462 if (ret < 0)
463 return ret;
464
465 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
466 dsi->format = MIPI_DSI_FMT_RGB888;
467 dsi->lanes = 4;
468
469 return mipi_dsi_attach(dsi);
470 }
471
ili9881c_dsi_remove(struct mipi_dsi_device * dsi)472 static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi)
473 {
474 struct ili9881c *ctx = mipi_dsi_get_drvdata(dsi);
475
476 mipi_dsi_detach(dsi);
477 drm_panel_remove(&ctx->panel);
478
479 if (ctx->backlight)
480 put_device(&ctx->backlight->dev);
481
482 return 0;
483 }
484
485 static const struct of_device_id ili9881c_of_match[] = {
486 { .compatible = "bananapi,lhr050h41" },
487 { }
488 };
489 MODULE_DEVICE_TABLE(of, ili9881c_of_match);
490
491 static struct mipi_dsi_driver ili9881c_dsi_driver = {
492 .probe = ili9881c_dsi_probe,
493 .remove = ili9881c_dsi_remove,
494 .driver = {
495 .name = "ili9881c-dsi",
496 .of_match_table = ili9881c_of_match,
497 },
498 };
499 module_mipi_dsi_driver(ili9881c_dsi_driver);
500
501 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
502 MODULE_DESCRIPTION("Ilitek ILI9881C Controller Driver");
503 MODULE_LICENSE("GPL v2");
504
