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#include <drm/drm_print.h>
 27
 28struct rb070d30_panel {
 29	struct drm_panel panel;
 30	struct mipi_dsi_device *dsi;
 31	struct regulator *supply;
 32
 33	struct {
 34		struct gpio_desc *power;
 35		struct gpio_desc *reset;
 36		struct gpio_desc *updn;
 37		struct gpio_desc *shlr;
 38	} gpios;
 39};
 40
 41static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
 42{
 43	return container_of(panel, struct rb070d30_panel, panel);
 44}
 45
 46static int rb070d30_panel_prepare(struct drm_panel *panel)
 47{
 48	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
 49	int ret;
 50
 51	ret = regulator_enable(ctx->supply);
 52	if (ret < 0) {
 53		DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
 54		return ret;
 55	}
 56
 57	msleep(20);
 58	gpiod_set_value(ctx->gpios.power, 1);
 59	msleep(20);
 60	gpiod_set_value(ctx->gpios.reset, 1);
 61	msleep(20);
 62	return 0;
 63}
 64
 65static int rb070d30_panel_unprepare(struct drm_panel *panel)
 66{
 67	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
 68
 69	gpiod_set_value(ctx->gpios.reset, 0);
 70	gpiod_set_value(ctx->gpios.power, 0);
 71	regulator_disable(ctx->supply);
 72
 73	return 0;
 74}
 75
 76static int rb070d30_panel_enable(struct drm_panel *panel)
 77{
 78	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
 79	int ret;
 80
 81	ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
 82	if (ret)
 83		return ret;
 84
 85	return 0;
 86}
 87
 88static int rb070d30_panel_disable(struct drm_panel *panel)
 89{
 90	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
 91
 92	return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
 93}
 94
 95/* Default timings */
 96static const struct drm_display_mode default_mode = {
 97	.clock		= 51206,
 98	.hdisplay	= 1024,
 99	.hsync_start	= 1024 + 160,
100	.hsync_end	= 1024 + 160 + 80,
101	.htotal		= 1024 + 160 + 80 + 80,
102	.vdisplay	= 600,
103	.vsync_start	= 600 + 12,
104	.vsync_end	= 600 + 12 + 10,
105	.vtotal		= 600 + 12 + 10 + 13,
106
107	.width_mm	= 154,
108	.height_mm	= 85,
109};
110
111static int rb070d30_panel_get_modes(struct drm_panel *panel,
112				    struct drm_connector *connector)
113{
114	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
115	struct drm_display_mode *mode;
116	static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
117
118	mode = drm_mode_duplicate(connector->dev, &default_mode);
119	if (!mode) {
120		DRM_DEV_ERROR(&ctx->dsi->dev,
121			      "Failed to add mode " DRM_MODE_FMT "\n",
122			      DRM_MODE_ARG(&default_mode));
123		return -EINVAL;
124	}
125
126	drm_mode_set_name(mode);
127
128	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
129	drm_mode_probed_add(connector, mode);
130
131	connector->display_info.bpc = 8;
132	connector->display_info.width_mm = mode->width_mm;
133	connector->display_info.height_mm = mode->height_mm;
134	drm_display_info_set_bus_formats(&connector->display_info,
135					 &bus_format, 1);
136
137	return 1;
138}
139
140static const struct drm_panel_funcs rb070d30_panel_funcs = {
141	.get_modes	= rb070d30_panel_get_modes,
142	.prepare	= rb070d30_panel_prepare,
143	.enable		= rb070d30_panel_enable,
144	.disable	= rb070d30_panel_disable,
145	.unprepare	= rb070d30_panel_unprepare,
146};
147
148static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
149{
150	struct rb070d30_panel *ctx;
151	int ret;
152
153	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
154	if (!ctx)
155		return -ENOMEM;
156
157	ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
158	if (IS_ERR(ctx->supply))
159		return PTR_ERR(ctx->supply);
160
161	mipi_dsi_set_drvdata(dsi, ctx);
162	ctx->dsi = dsi;
163
164	drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs,
165		       DRM_MODE_CONNECTOR_DSI);
166
167	ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
168	if (IS_ERR(ctx->gpios.reset)) {
169		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
170		return PTR_ERR(ctx->gpios.reset);
171	}
172
173	ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
174	if (IS_ERR(ctx->gpios.power)) {
175		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
176		return PTR_ERR(ctx->gpios.power);
177	}
178
179	/*
180	 * We don't change the state of that GPIO later on but we need
181	 * to force it into a low state.
182	 */
183	ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
184	if (IS_ERR(ctx->gpios.updn)) {
185		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
186		return PTR_ERR(ctx->gpios.updn);
187	}
188
189	/*
190	 * We don't change the state of that GPIO later on but we need
191	 * to force it into a low state.
192	 */
193	ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
194	if (IS_ERR(ctx->gpios.shlr)) {
195		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
196		return PTR_ERR(ctx->gpios.shlr);
197	}
198
199	ret = drm_panel_of_backlight(&ctx->panel);
200	if (ret)
201		return ret;
202
203	ret = drm_panel_add(&ctx->panel);
204	if (ret < 0)
205		return ret;
206
207	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
208	dsi->format = MIPI_DSI_FMT_RGB888;
209	dsi->lanes = 4;
210
211	return mipi_dsi_attach(dsi);
212}
213
214static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
215{
216	struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);
217
218	mipi_dsi_detach(dsi);
219	drm_panel_remove(&ctx->panel);
220
221	return 0;
222}
223
224static const struct of_device_id rb070d30_panel_of_match[] = {
225	{ .compatible = "ronbo,rb070d30" },
226	{ /* sentinel */ },
227};
228MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);
229
230static struct mipi_dsi_driver rb070d30_panel_driver = {
231	.probe = rb070d30_panel_dsi_probe,
232	.remove = rb070d30_panel_dsi_remove,
233	.driver = {
234		.name = "panel-ronbo-rb070d30",
235		.of_match_table	= rb070d30_panel_of_match,
236	},
237};
238module_mipi_dsi_driver(rb070d30_panel_driver);
239
240MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
241MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
242MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
243MODULE_LICENSE("GPL");