tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 .vrefresh = 60,
107
108 .width_mm = 154,
109 .height_mm = 85,
110};
111
112static int rb070d30_panel_get_modes(struct drm_panel *panel,
113 struct drm_connector *connector)
114{
115 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
116 struct drm_display_mode *mode;
117 static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
118
119 mode = drm_mode_duplicate(connector->dev, &default_mode);
120 if (!mode) {
121 DRM_DEV_ERROR(&ctx->dsi->dev,
122 "Failed to add mode " DRM_MODE_FMT "\n",
123 DRM_MODE_ARG(&default_mode));
124 return -EINVAL;
125 }
126
127 drm_mode_set_name(mode);
128
129 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
130 drm_mode_probed_add(connector, mode);
131
132 connector->display_info.bpc = 8;
133 connector->display_info.width_mm = mode->width_mm;
134 connector->display_info.height_mm = mode->height_mm;
135 drm_display_info_set_bus_formats(&connector->display_info,
136 &bus_format, 1);
137
138 return 1;
139}
140
141static const struct drm_panel_funcs rb070d30_panel_funcs = {
142 .get_modes = rb070d30_panel_get_modes,
143 .prepare = rb070d30_panel_prepare,
144 .enable = rb070d30_panel_enable,
145 .disable = rb070d30_panel_disable,
146 .unprepare = rb070d30_panel_unprepare,
147};
148
149static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
150{
151 struct rb070d30_panel *ctx;
152 int ret;
153
154 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
155 if (!ctx)
156 return -ENOMEM;
157
158 ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
159 if (IS_ERR(ctx->supply))
160 return PTR_ERR(ctx->supply);
161
162 mipi_dsi_set_drvdata(dsi, ctx);
163 ctx->dsi = dsi;
164
165 drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs,
166 DRM_MODE_CONNECTOR_DSI);
167
168 ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
169 if (IS_ERR(ctx->gpios.reset)) {
170 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
171 return PTR_ERR(ctx->gpios.reset);
172 }
173
174 ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
175 if (IS_ERR(ctx->gpios.power)) {
176 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
177 return PTR_ERR(ctx->gpios.power);
178 }
179
180 /*
181 * We don't change the state of that GPIO later on but we need
182 * to force it into a low state.
183 */
184 ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
185 if (IS_ERR(ctx->gpios.updn)) {
186 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
187 return PTR_ERR(ctx->gpios.updn);
188 }
189
190 /*
191 * We don't change the state of that GPIO later on but we need
192 * to force it into a low state.
193 */
194 ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
195 if (IS_ERR(ctx->gpios.shlr)) {
196 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
197 return PTR_ERR(ctx->gpios.shlr);
198 }
199
200 ret = drm_panel_of_backlight(&ctx->panel);
201 if (ret)
202 return ret;
203
204 ret = drm_panel_add(&ctx->panel);
205 if (ret < 0)
206 return ret;
207
208 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
209 dsi->format = MIPI_DSI_FMT_RGB888;
210 dsi->lanes = 4;
211
212 return mipi_dsi_attach(dsi);
213}
214
215static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
216{
217 struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);
218
219 mipi_dsi_detach(dsi);
220 drm_panel_remove(&ctx->panel);
221
222 return 0;
223}
224
225static const struct of_device_id rb070d30_panel_of_match[] = {
226 { .compatible = "ronbo,rb070d30" },
227 { /* sentinel */ },
228};
229MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);
230
231static struct mipi_dsi_driver rb070d30_panel_driver = {
232 .probe = rb070d30_panel_dsi_probe,
233 .remove = rb070d30_panel_dsi_remove,
234 .driver = {
235 .name = "panel-ronbo-rb070d30",
236 .of_match_table = rb070d30_panel_of_match,
237 },
238};
239module_mipi_dsi_driver(rb070d30_panel_driver);
240
241MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
242MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
243MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
244MODULE_LICENSE("GPL");