1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Elida kd35t133 5.5" MIPI-DSI panel driver
4 * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH
5 *
6 * based on
7 *
8 * Rockteck jh057n00900 5.5" MIPI-DSI panel driver
9 * Copyright (C) Purism SPC 2019
10 */
11
12#include <linux/delay.h>
13#include <linux/gpio/consumer.h>
14#include <linux/media-bus-format.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/regulator/consumer.h>
18
19#include <video/display_timing.h>
20#include <video/mipi_display.h>
21
22#include <drm/drm_mipi_dsi.h>
23#include <drm/drm_modes.h>
24#include <drm/drm_panel.h>
25
26/* Manufacturer specific Commands send via DSI */
27#define KD35T133_CMD_INTERFACEMODECTRL		0xb0
28#define KD35T133_CMD_FRAMERATECTRL		0xb1
29#define KD35T133_CMD_DISPLAYINVERSIONCTRL	0xb4
30#define KD35T133_CMD_DISPLAYFUNCTIONCTRL	0xb6
31#define KD35T133_CMD_POWERCONTROL1		0xc0
32#define KD35T133_CMD_POWERCONTROL2		0xc1
33#define KD35T133_CMD_VCOMCONTROL		0xc5
34#define KD35T133_CMD_POSITIVEGAMMA		0xe0
35#define KD35T133_CMD_NEGATIVEGAMMA		0xe1
36#define KD35T133_CMD_SETIMAGEFUNCTION		0xe9
37#define KD35T133_CMD_ADJUSTCONTROL3		0xf7
38
39struct kd35t133 {
40	struct device *dev;
41	struct drm_panel panel;
42	struct gpio_desc *reset_gpio;
43	struct regulator *vdd;
44	struct regulator *iovcc;
45	bool prepared;
46};
47
48static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
49{
50	return container_of(panel, struct kd35t133, panel);
51}
52
53#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
54		static const u8 b[] = { cmd, seq };			\
55		int ret;						\
56		ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b));	\
57		if (ret < 0)						\
58			return ret;					\
59	} while (0)
60
61static int kd35t133_init_sequence(struct kd35t133 *ctx)
62{
63	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
64	struct device *dev = ctx->dev;
65
66	/*
67	 * Init sequence was supplied by the panel vendor with minimal
68	 * documentation.
69	 */
70	dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
71			  0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
72			  0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
73	dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
74			  0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
75			  0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
76	dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
77	dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
78	dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
79	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
80	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
81	dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
82	dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
83	dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
84	dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
85			  0x20, 0x02);
86	dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
87	dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
88			  0xa9, 0x51, 0x2c, 0x82);
89	mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
90
91	dev_dbg(dev, "Panel init sequence done\n");
92	return 0;
93}
94
95static int kd35t133_unprepare(struct drm_panel *panel)
96{
97	struct kd35t133 *ctx = panel_to_kd35t133(panel);
98	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
99	int ret;
100
101	if (!ctx->prepared)
102		return 0;
103
104	ret = mipi_dsi_dcs_set_display_off(dsi);
105	if (ret < 0)
106		dev_err(ctx->dev, "failed to set display off: %d\n", ret);
107
108	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
109	if (ret < 0) {
110		dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
111		return ret;
112	}
113
114	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
115
116	regulator_disable(ctx->iovcc);
117	regulator_disable(ctx->vdd);
118
119	ctx->prepared = false;
120
121	return 0;
122}
123
124static int kd35t133_prepare(struct drm_panel *panel)
125{
126	struct kd35t133 *ctx = panel_to_kd35t133(panel);
127	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
128	int ret;
129
130	if (ctx->prepared)
131		return 0;
132
133	dev_dbg(ctx->dev, "Resetting the panel\n");
134	ret = regulator_enable(ctx->vdd);
135	if (ret < 0) {
136		dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
137		return ret;
138	}
139
140	ret = regulator_enable(ctx->iovcc);
141	if (ret < 0) {
142		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
143		goto disable_vdd;
144	}
145
146	msleep(20);
147
148	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
149	usleep_range(10, 20);
150	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
151
152	msleep(20);
153
154	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
155	if (ret < 0) {
156		dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
157		goto disable_iovcc;
158	}
159
160	msleep(250);
161
162	ret = kd35t133_init_sequence(ctx);
163	if (ret < 0) {
164		dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
165		goto disable_iovcc;
166	}
167
168	ret = mipi_dsi_dcs_set_display_on(dsi);
169	if (ret < 0) {
170		dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
171		goto disable_iovcc;
172	}
173
174	msleep(50);
175
176	ctx->prepared = true;
177
178	return 0;
179
180disable_iovcc:
181	regulator_disable(ctx->iovcc);
182disable_vdd:
183	regulator_disable(ctx->vdd);
184	return ret;
185}
186
187static const struct drm_display_mode default_mode = {
188	.hdisplay	= 320,
189	.hsync_start	= 320 + 130,
190	.hsync_end	= 320 + 130 + 4,
191	.htotal		= 320 + 130 + 4 + 130,
192	.vdisplay	= 480,
193	.vsync_start	= 480 + 2,
194	.vsync_end	= 480 + 2 + 1,
195	.vtotal		= 480 + 2 + 1 + 2,
196	.clock		= 17000,
197	.width_mm	= 42,
198	.height_mm	= 82,
199};
200
201static int kd35t133_get_modes(struct drm_panel *panel,
202				struct drm_connector *connector)
203{
204	struct kd35t133 *ctx = panel_to_kd35t133(panel);
205	struct drm_display_mode *mode;
206
207	mode = drm_mode_duplicate(connector->dev, &default_mode);
208	if (!mode) {
209		dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
210			default_mode.hdisplay, default_mode.vdisplay,
211			drm_mode_vrefresh(&default_mode));
212		return -ENOMEM;
213	}
214
215	drm_mode_set_name(mode);
216
217	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
218	connector->display_info.width_mm = mode->width_mm;
219	connector->display_info.height_mm = mode->height_mm;
220	drm_mode_probed_add(connector, mode);
221
222	return 1;
223}
224
225static const struct drm_panel_funcs kd35t133_funcs = {
226	.unprepare	= kd35t133_unprepare,
227	.prepare	= kd35t133_prepare,
228	.get_modes	= kd35t133_get_modes,
229};
230
231static int kd35t133_probe(struct mipi_dsi_device *dsi)
232{
233	struct device *dev = &dsi->dev;
234	struct kd35t133 *ctx;
235	int ret;
236
237	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
238	if (!ctx)
239		return -ENOMEM;
240
241	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
242	if (IS_ERR(ctx->reset_gpio)) {
243		dev_err(dev, "cannot get reset gpio\n");
244		return PTR_ERR(ctx->reset_gpio);
245	}
246
247	ctx->vdd = devm_regulator_get(dev, "vdd");
248	if (IS_ERR(ctx->vdd)) {
249		ret = PTR_ERR(ctx->vdd);
250		if (ret != -EPROBE_DEFER)
251			dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
252		return ret;
253	}
254
255	ctx->iovcc = devm_regulator_get(dev, "iovcc");
256	if (IS_ERR(ctx->iovcc)) {
257		ret = PTR_ERR(ctx->iovcc);
258		if (ret != -EPROBE_DEFER)
259			dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
260		return ret;
261	}
262
263	mipi_dsi_set_drvdata(dsi, ctx);
264
265	ctx->dev = dev;
266
267	dsi->lanes = 1;
268	dsi->format = MIPI_DSI_FMT_RGB888;
269	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
270			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET |
271			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
272
273	drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
274		       DRM_MODE_CONNECTOR_DSI);
275
276	ret = drm_panel_of_backlight(&ctx->panel);
277	if (ret)
278		return ret;
279
280	drm_panel_add(&ctx->panel);
281
282	ret = mipi_dsi_attach(dsi);
283	if (ret < 0) {
284		dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
285		drm_panel_remove(&ctx->panel);
286		return ret;
287	}
288
289	return 0;
290}
291
292static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
293{
294	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
295	int ret;
296
297	ret = drm_panel_unprepare(&ctx->panel);
298	if (ret < 0)
299		dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
300
301	ret = drm_panel_disable(&ctx->panel);
302	if (ret < 0)
303		dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
304}
305
306static int kd35t133_remove(struct mipi_dsi_device *dsi)
307{
308	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
309	int ret;
310
311	kd35t133_shutdown(dsi);
312
313	ret = mipi_dsi_detach(dsi);
314	if (ret < 0)
315		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
316
317	drm_panel_remove(&ctx->panel);
318
319	return 0;
320}
321
322static const struct of_device_id kd35t133_of_match[] = {
323	{ .compatible = "elida,kd35t133" },
324	{ /* sentinel */ }
325};
326MODULE_DEVICE_TABLE(of, kd35t133_of_match);
327
328static struct mipi_dsi_driver kd35t133_driver = {
329	.driver = {
330		.name = "panel-elida-kd35t133",
331		.of_match_table = kd35t133_of_match,
332	},
333	.probe	= kd35t133_probe,
334	.remove = kd35t133_remove,
335	.shutdown = kd35t133_shutdown,
336};
337module_mipi_dsi_driver(kd35t133_driver);
338
339MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
340MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
341MODULE_LICENSE("GPL v2");
342