1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/backlight.h>
4 #include <drm/drm_device.h>
5 #include <drm/drm_mipi_dsi.h>
6 #include <drm/drm_mode.h>
7 #include <drm/drm_modes.h>
8 #include <drm/drm_panel.h>
9 #include <drm/drm_probe_helper.h>
10 #include <video/mipi_display.h>
11
12 struct summit_data {
13 struct mipi_dsi_device *dsi;
14 struct backlight_device *bl;
15 struct drm_panel panel;
16 };
17
summit_set_brightness(struct device * dev)18 static int summit_set_brightness(struct device *dev)
19 {
20 struct summit_data *s_data = dev_get_drvdata(dev);
21 int level = backlight_get_brightness(s_data->bl);
22
23 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level);
24 }
25
summit_bl_update_status(struct backlight_device * dev)26 static int summit_bl_update_status(struct backlight_device *dev)
27 {
28 return summit_set_brightness(&dev->dev);
29 }
30
31 static const struct backlight_ops summit_bl_ops = {
32 .update_status = summit_bl_update_status,
33 };
34
35 static struct drm_display_mode summit_mode = {
36 .vdisplay = 2008,
37 .hdisplay = 60,
38 .hsync_start = 60 + 8,
39 .hsync_end = 60 + 8 + 80,
40 .htotal = 60 + 8 + 80 + 40,
41 .vsync_start = 2008 + 1,
42 .vsync_end = 2008 + 1 + 15,
43 .vtotal = 2008 + 1 + 15 + 6,
44 .clock = ((60 + 8 + 80 + 40) * (2008 + 1 + 15 + 6) * 60) / 1000,
45 .type = DRM_MODE_TYPE_DRIVER,
46 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC,
47 };
48
summit_get_modes(struct drm_panel * panel,struct drm_connector * connector)49 static int summit_get_modes(struct drm_panel *panel,
50 struct drm_connector *connector)
51 {
52 connector->display_info.non_desktop = true;
53 drm_object_property_set_value(&connector->base,
54 connector->dev->mode_config.non_desktop_property,
55 connector->display_info.non_desktop);
56
57 return drm_connector_helper_get_modes_fixed(connector, &summit_mode);
58 }
59
60 static const struct drm_panel_funcs summit_panel_funcs = {
61 .get_modes = summit_get_modes,
62 };
63
summit_probe(struct mipi_dsi_device * dsi)64 static int summit_probe(struct mipi_dsi_device *dsi)
65 {
66 struct backlight_properties props = { 0 };
67 struct device *dev = &dsi->dev;
68 struct summit_data *s_data;
69 int ret;
70
71 s_data = devm_kzalloc(dev, sizeof(*s_data), GFP_KERNEL);
72 if (!s_data)
73 return -ENOMEM;
74
75 mipi_dsi_set_drvdata(dsi, s_data);
76 s_data->dsi = dsi;
77
78 ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
79 if (ret)
80 return ret;
81 props.type = BACKLIGHT_RAW;
82
83 s_data->bl = devm_backlight_device_register(dev, dev_name(dev),
84 dev, s_data, &summit_bl_ops, &props);
85 if (IS_ERR(s_data->bl))
86 return PTR_ERR(s_data->bl);
87
88 drm_panel_init(&s_data->panel, dev, &summit_panel_funcs,
89 DRM_MODE_CONNECTOR_DSI);
90 drm_panel_add(&s_data->panel);
91
92 return mipi_dsi_attach(dsi);
93 }
94
summit_remove(struct mipi_dsi_device * dsi)95 static void summit_remove(struct mipi_dsi_device *dsi)
96 {
97 struct summit_data *s_data = mipi_dsi_get_drvdata(dsi);
98
99 mipi_dsi_detach(dsi);
100 drm_panel_remove(&s_data->panel);
101 }
102
summit_suspend(struct device * dev)103 static int summit_suspend(struct device *dev)
104 {
105 struct summit_data *s_data = dev_get_drvdata(dev);
106
107 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0);
108 }
109
110 static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend,
111 summit_set_brightness);
112
113 static const struct of_device_id summit_of_match[] = {
114 { .compatible = "apple,summit" },
115 {},
116 };
117
118 MODULE_DEVICE_TABLE(of, summit_of_match);
119
120 static struct mipi_dsi_driver summit_driver = {
121 .probe = summit_probe,
122 .remove = summit_remove,
123 .driver = {
124 .name = "panel-summit",
125 .of_match_table = summit_of_match,
126 .pm = pm_sleep_ptr(&summit_pm_ops),
127 },
128 };
129 module_mipi_dsi_driver(summit_driver);
130
131 MODULE_DESCRIPTION("Summit Display Panel Driver");
132 MODULE_LICENSE("GPL");
133