tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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/backlight.h>
11#include <linux/delay.h>
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/fb.h>
16#include <linux/kernel.h>
17#include <linux/media-bus-format.h>
18#include <linux/module.h>
19
20#include <linux/gpio/consumer.h>
21#include <linux/regulator/consumer.h>
22
23#include <drm/drm_connector.h>
24#include <drm/drm_mipi_dsi.h>
25#include <drm/drm_modes.h>
26#include <drm/drm_panel.h>
27#include <drm/drm_print.h>
28
29struct rb070d30_panel {
30 struct drm_panel panel;
31 struct mipi_dsi_device *dsi;
32 struct backlight_device *backlight;
33 struct regulator *supply;
34
35 struct {
36 struct gpio_desc *power;
37 struct gpio_desc *reset;
38 struct gpio_desc *updn;
39 struct gpio_desc *shlr;
40 } gpios;
41};
42
43static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
44{
45 return container_of(panel, struct rb070d30_panel, panel);
46}
47
48static int rb070d30_panel_prepare(struct drm_panel *panel)
49{
50 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
51 int ret;
52
53 ret = regulator_enable(ctx->supply);
54 if (ret < 0) {
55 DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
56 return ret;
57 }
58
59 msleep(20);
60 gpiod_set_value(ctx->gpios.power, 1);
61 msleep(20);
62 gpiod_set_value(ctx->gpios.reset, 1);
63 msleep(20);
64 return 0;
65}
66
67static int rb070d30_panel_unprepare(struct drm_panel *panel)
68{
69 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
70
71 gpiod_set_value(ctx->gpios.reset, 0);
72 gpiod_set_value(ctx->gpios.power, 0);
73 regulator_disable(ctx->supply);
74
75 return 0;
76}
77
78static int rb070d30_panel_enable(struct drm_panel *panel)
79{
80 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
81 int ret;
82
83 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
84 if (ret)
85 return ret;
86
87 ret = backlight_enable(ctx->backlight);
88 if (ret)
89 goto out;
90
91 return 0;
92
93out:
94 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
95 return ret;
96}
97
98static int rb070d30_panel_disable(struct drm_panel *panel)
99{
100 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
101
102 backlight_disable(ctx->backlight);
103 return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
104}
105
106/* Default timings */
107static const struct drm_display_mode default_mode = {
108 .clock = 51206,
109 .hdisplay = 1024,
110 .hsync_start = 1024 + 160,
111 .hsync_end = 1024 + 160 + 80,
112 .htotal = 1024 + 160 + 80 + 80,
113 .vdisplay = 600,
114 .vsync_start = 600 + 12,
115 .vsync_end = 600 + 12 + 10,
116 .vtotal = 600 + 12 + 10 + 13,
117 .vrefresh = 60,
118
119 .width_mm = 154,
120 .height_mm = 85,
121};
122
123static int rb070d30_panel_get_modes(struct drm_panel *panel)
124{
125 struct drm_connector *connector = panel->connector;
126 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
127 struct drm_display_mode *mode;
128 static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
129
130 mode = drm_mode_duplicate(panel->drm, &default_mode);
131 if (!mode) {
132 DRM_DEV_ERROR(&ctx->dsi->dev,
133 "Failed to add mode " DRM_MODE_FMT "\n",
134 DRM_MODE_ARG(&default_mode));
135 return -EINVAL;
136 }
137
138 drm_mode_set_name(mode);
139
140 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
141 drm_mode_probed_add(connector, mode);
142
143 panel->connector->display_info.bpc = 8;
144 panel->connector->display_info.width_mm = mode->width_mm;
145 panel->connector->display_info.height_mm = mode->height_mm;
146 drm_display_info_set_bus_formats(&connector->display_info,
147 &bus_format, 1);
148
149 return 1;
150}
151
152static const struct drm_panel_funcs rb070d30_panel_funcs = {
153 .get_modes = rb070d30_panel_get_modes,
154 .prepare = rb070d30_panel_prepare,
155 .enable = rb070d30_panel_enable,
156 .disable = rb070d30_panel_disable,
157 .unprepare = rb070d30_panel_unprepare,
158};
159
160static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
161{
162 struct rb070d30_panel *ctx;
163 int ret;
164
165 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
166 if (!ctx)
167 return -ENOMEM;
168
169 ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
170 if (IS_ERR(ctx->supply))
171 return PTR_ERR(ctx->supply);
172
173 mipi_dsi_set_drvdata(dsi, ctx);
174 ctx->dsi = dsi;
175
176 drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs,
177 DRM_MODE_CONNECTOR_DSI);
178
179 ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
180 if (IS_ERR(ctx->gpios.reset)) {
181 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
182 return PTR_ERR(ctx->gpios.reset);
183 }
184
185 ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
186 if (IS_ERR(ctx->gpios.power)) {
187 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
188 return PTR_ERR(ctx->gpios.power);
189 }
190
191 /*
192 * We don't change the state of that GPIO later on but we need
193 * to force it into a low state.
194 */
195 ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
196 if (IS_ERR(ctx->gpios.updn)) {
197 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
198 return PTR_ERR(ctx->gpios.updn);
199 }
200
201 /*
202 * We don't change the state of that GPIO later on but we need
203 * to force it into a low state.
204 */
205 ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
206 if (IS_ERR(ctx->gpios.shlr)) {
207 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
208 return PTR_ERR(ctx->gpios.shlr);
209 }
210
211 ctx->backlight = devm_of_find_backlight(&dsi->dev);
212 if (IS_ERR(ctx->backlight)) {
213 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our backlight\n");
214 return PTR_ERR(ctx->backlight);
215 }
216
217 ret = drm_panel_add(&ctx->panel);
218 if (ret < 0)
219 return ret;
220
221 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
222 dsi->format = MIPI_DSI_FMT_RGB888;
223 dsi->lanes = 4;
224
225 return mipi_dsi_attach(dsi);
226}
227
228static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
229{
230 struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);
231
232 mipi_dsi_detach(dsi);
233 drm_panel_remove(&ctx->panel);
234
235 return 0;
236}
237
238static const struct of_device_id rb070d30_panel_of_match[] = {
239 { .compatible = "ronbo,rb070d30" },
240 { /* sentinel */ },
241};
242MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);
243
244static struct mipi_dsi_driver rb070d30_panel_driver = {
245 .probe = rb070d30_panel_dsi_probe,
246 .remove = rb070d30_panel_dsi_remove,
247 .driver = {
248 .name = "panel-ronbo-rb070d30",
249 .of_match_table = rb070d30_panel_of_match,
250 },
251};
252module_mipi_dsi_driver(rb070d30_panel_driver);
253
254MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
255MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
256MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
257MODULE_LICENSE("GPL");