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 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 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 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 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 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 } 103 104 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