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 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 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 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 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 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 } 102 103 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