1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/backlight.h>
4 #include <linux/property.h>
5 #include <drm/drm_device.h>
6 #include <drm/drm_mipi_dsi.h>
7 #include <drm/drm_mode.h>
8 #include <drm/drm_modes.h>
9 #include <drm/drm_panel.h>
10 #include <drm/drm_probe_helper.h>
11 #include <video/mipi_display.h>
12
13 struct summit_data {
14 struct mipi_dsi_device *dsi;
15 struct backlight_device *bl;
16 struct drm_panel panel;
17 };
18
summit_set_brightness(struct device * dev)19 static int summit_set_brightness(struct device *dev)
20 {
21 struct summit_data *s_data = dev_get_drvdata(dev);
22 int level = backlight_get_brightness(s_data->bl);
23
24 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level);
25 }
26
summit_bl_update_status(struct backlight_device * dev)27 static int summit_bl_update_status(struct backlight_device *dev)
28 {
29 return summit_set_brightness(&dev->dev);
30 }
31
32 static const struct backlight_ops summit_bl_ops = {
33 .update_status = summit_bl_update_status,
34 };
35
36 static struct drm_display_mode summit_mode = {
37 .vdisplay = 2008,
38 .hdisplay = 60,
39 .hsync_start = 60 + 8,
40 .hsync_end = 60 + 8 + 80,
41 .htotal = 60 + 8 + 80 + 40,
42 .vsync_start = 2008 + 1,
43 .vsync_end = 2008 + 1 + 15,
44 .vtotal = 2008 + 1 + 15 + 6,
45 .clock = ((60 + 8 + 80 + 40) * (2008 + 1 + 15 + 6) * 60) / 1000,
46 .type = DRM_MODE_TYPE_DRIVER,
47 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC,
48 };
49
summit_get_modes(struct drm_panel * panel,struct drm_connector * connector)50 static int summit_get_modes(struct drm_panel *panel,
51 struct drm_connector *connector)
52 {
53 connector->display_info.non_desktop = true;
54 drm_object_property_set_value(&connector->base,
55 connector->dev->mode_config.non_desktop_property,
56 connector->display_info.non_desktop);
57
58 return drm_connector_helper_get_modes_fixed(connector, &summit_mode);
59 }
60
61 static const struct drm_panel_funcs summit_panel_funcs = {
62 .get_modes = summit_get_modes,
63 };
64
summit_probe(struct mipi_dsi_device * dsi)65 static int summit_probe(struct mipi_dsi_device *dsi)
66 {
67 struct backlight_properties props = { 0 };
68 struct device *dev = &dsi->dev;
69 struct summit_data *s_data;
70 int ret;
71
72 s_data = devm_drm_panel_alloc(dev, struct summit_data, panel,
73 &summit_panel_funcs,
74 DRM_MODE_CONNECTOR_DSI);
75 if (IS_ERR(s_data))
76 return PTR_ERR(s_data);
77
78 mipi_dsi_set_drvdata(dsi, s_data);
79 s_data->dsi = dsi;
80
81 ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
82 if (ret)
83 return ret;
84 props.type = BACKLIGHT_RAW;
85
86 s_data->bl = devm_backlight_device_register(dev, dev_name(dev),
87 dev, s_data, &summit_bl_ops, &props);
88 if (IS_ERR(s_data->bl))
89 return PTR_ERR(s_data->bl);
90
91 drm_panel_add(&s_data->panel);
92
93 return mipi_dsi_attach(dsi);
94 }
95
summit_remove(struct mipi_dsi_device * dsi)96 static void summit_remove(struct mipi_dsi_device *dsi)
97 {
98 struct summit_data *s_data = mipi_dsi_get_drvdata(dsi);
99
100 mipi_dsi_detach(dsi);
101 drm_panel_remove(&s_data->panel);
102 }
103
summit_suspend(struct device * dev)104 static int summit_suspend(struct device *dev)
105 {
106 struct summit_data *s_data = dev_get_drvdata(dev);
107
108 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0);
109 }
110
111 static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend,
112 summit_set_brightness);
113
114 static const struct of_device_id summit_of_match[] = {
115 { .compatible = "apple,summit" },
116 {},
117 };
118
119 MODULE_DEVICE_TABLE(of, summit_of_match);
120
121 static struct mipi_dsi_driver summit_driver = {
122 .probe = summit_probe,
123 .remove = summit_remove,
124 .driver = {
125 .name = "panel-summit",
126 .of_match_table = summit_of_match,
127 .pm = pm_sleep_ptr(&summit_pm_ops),
128 },
129 };
130 module_mipi_dsi_driver(summit_driver);
131
132 MODULE_DESCRIPTION("Summit Display Panel Driver");
133 MODULE_LICENSE("GPL");
134