1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2018-2019, Bridge Systems BV
4 * Copyright (C) 2018-2019, Bootlin
5 * Copyright (C) 2017, Free Electrons
6 *
7 * This file based on panel-ilitek-ili9881c.c
8 */
9
10#include <linux/delay.h>
11#include <linux/device.h>
12#include <linux/err.h>
13#include <linux/errno.h>
14#include <linux/fb.h>
15#include <linux/kernel.h>
16#include <linux/media-bus-format.h>
17#include <linux/module.h>
18
19#include <linux/gpio/consumer.h>
20#include <linux/regulator/consumer.h>
21
22#include <drm/drm_connector.h>
23#include <drm/drm_mipi_dsi.h>
24#include <drm/drm_modes.h>
25#include <drm/drm_panel.h>
26
27struct rb070d30_panel {
28	struct drm_panel panel;
29	struct mipi_dsi_device *dsi;
30	struct regulator *supply;
31
32	struct {
33		struct gpio_desc *power;
34		struct gpio_desc *reset;
35		struct gpio_desc *updn;
36		struct gpio_desc *shlr;
37	} gpios;
38};
39
40static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
41{
42	return container_of(panel, struct rb070d30_panel, panel);
43}
44
45static int rb070d30_panel_prepare(struct drm_panel *panel)
46{
47	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
48	int ret;
49
50	ret = regulator_enable(ctx->supply);
51	if (ret < 0) {
52		dev_err(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
53		return ret;
54	}
55
56	msleep(20);
57	gpiod_set_value(ctx->gpios.power, 1);
58	msleep(20);
59	gpiod_set_value(ctx->gpios.reset, 1);
60	msleep(20);
61	return 0;
62}
63
64static int rb070d30_panel_unprepare(struct drm_panel *panel)
65{
66	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
67
68	gpiod_set_value(ctx->gpios.reset, 0);
69	gpiod_set_value(ctx->gpios.power, 0);
70	regulator_disable(ctx->supply);
71
72	return 0;
73}
74
75static int rb070d30_panel_enable(struct drm_panel *panel)
76{
77	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
78	int ret;
79
80	ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
81	if (ret)
82		return ret;
83
84	return 0;
85}
86
87static int rb070d30_panel_disable(struct drm_panel *panel)
88{
89	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
90
91	return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
92}
93
94/* Default timings */
95static const struct drm_display_mode default_mode = {
96	.clock		= 51206,
97	.hdisplay	= 1024,
98	.hsync_start	= 1024 + 160,
99	.hsync_end	= 1024 + 160 + 80,
100	.htotal		= 1024 + 160 + 80 + 80,
101	.vdisplay	= 600,
102	.vsync_start	= 600 + 12,
103	.vsync_end	= 600 + 12 + 10,
104	.vtotal		= 600 + 12 + 10 + 13,
105
106	.width_mm	= 154,
107	.height_mm	= 85,
108};
109
110static int rb070d30_panel_get_modes(struct drm_panel *panel,
111				    struct drm_connector *connector)
112{
113	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
114	struct drm_display_mode *mode;
115	static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
116
117	mode = drm_mode_duplicate(connector->dev, &default_mode);
118	if (!mode) {
119		dev_err(&ctx->dsi->dev, "Failed to add mode " DRM_MODE_FMT "\n",
120			DRM_MODE_ARG(&default_mode));
121		return -EINVAL;
122	}
123
124	drm_mode_set_name(mode);
125
126	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
127	drm_mode_probed_add(connector, mode);
128
129	connector->display_info.bpc = 8;
130	connector->display_info.width_mm = mode->width_mm;
131	connector->display_info.height_mm = mode->height_mm;
132	drm_display_info_set_bus_formats(&connector->display_info,
133					 &bus_format, 1);
134
135	return 1;
136}
137
138static const struct drm_panel_funcs rb070d30_panel_funcs = {
139	.get_modes	= rb070d30_panel_get_modes,
140	.prepare	= rb070d30_panel_prepare,
141	.enable		= rb070d30_panel_enable,
142	.disable	= rb070d30_panel_disable,
143	.unprepare	= rb070d30_panel_unprepare,
144};
145
146static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
147{
148	struct rb070d30_panel *ctx;
149	int ret;
150
151	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
152	if (!ctx)
153		return -ENOMEM;
154
155	ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
156	if (IS_ERR(ctx->supply))
157		return PTR_ERR(ctx->supply);
158
159	mipi_dsi_set_drvdata(dsi, ctx);
160	ctx->dsi = dsi;
161
162	drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs,
163		       DRM_MODE_CONNECTOR_DSI);
164
165	ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
166	if (IS_ERR(ctx->gpios.reset)) {
167		dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
168		return PTR_ERR(ctx->gpios.reset);
169	}
170
171	ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
172	if (IS_ERR(ctx->gpios.power)) {
173		dev_err(&dsi->dev, "Couldn't get our power GPIO\n");
174		return PTR_ERR(ctx->gpios.power);
175	}
176
177	/*
178	 * We don't change the state of that GPIO later on but we need
179	 * to force it into a low state.
180	 */
181	ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
182	if (IS_ERR(ctx->gpios.updn)) {
183		dev_err(&dsi->dev, "Couldn't get our updn GPIO\n");
184		return PTR_ERR(ctx->gpios.updn);
185	}
186
187	/*
188	 * We don't change the state of that GPIO later on but we need
189	 * to force it into a low state.
190	 */
191	ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
192	if (IS_ERR(ctx->gpios.shlr)) {
193		dev_err(&dsi->dev, "Couldn't get our shlr GPIO\n");
194		return PTR_ERR(ctx->gpios.shlr);
195	}
196
197	ret = drm_panel_of_backlight(&ctx->panel);
198	if (ret)
199		return ret;
200
201	drm_panel_add(&ctx->panel);
202
203	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
204	dsi->format = MIPI_DSI_FMT_RGB888;
205	dsi->lanes = 4;
206
207	return mipi_dsi_attach(dsi);
208}
209
210static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
211{
212	struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);
213
214	mipi_dsi_detach(dsi);
215	drm_panel_remove(&ctx->panel);
216
217	return 0;
218}
219
220static const struct of_device_id rb070d30_panel_of_match[] = {
221	{ .compatible = "ronbo,rb070d30" },
222	{ /* sentinel */ },
223};
224MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);
225
226static struct mipi_dsi_driver rb070d30_panel_driver = {
227	.probe = rb070d30_panel_dsi_probe,
228	.remove = rb070d30_panel_dsi_remove,
229	.driver = {
230		.name = "panel-ronbo-rb070d30",
231		.of_match_table	= rb070d30_panel_of_match,
232	},
233};
234module_mipi_dsi_driver(rb070d30_panel_driver);
235
236MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
237MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
238MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
239MODULE_LICENSE("GPL");
240