1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/backlight.h> 4 #include <linux/mod_devicetable.h> 5 #include <linux/property.h> 6 #include <drm/drm_device.h> 7 #include <drm/drm_mipi_dsi.h> 8 #include <drm/drm_mode.h> 9 #include <drm/drm_modes.h> 10 #include <drm/drm_panel.h> 11 #include <drm/drm_probe_helper.h> 12 #include <video/mipi_display.h> 13 14 struct summit_data { 15 struct mipi_dsi_device *dsi; 16 struct backlight_device *bl; 17 struct drm_panel panel; 18 }; 19 20 static int summit_set_brightness(struct device *dev) 21 { 22 struct summit_data *s_data = dev_get_drvdata(dev); 23 int level = backlight_get_brightness(s_data->bl); 24 25 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level); 26 } 27 28 static int summit_bl_update_status(struct backlight_device *dev) 29 { 30 return summit_set_brightness(&dev->dev); 31 } 32 33 static const struct backlight_ops summit_bl_ops = { 34 .update_status = summit_bl_update_status, 35 }; 36 37 static struct drm_display_mode summit_mode = { 38 .vdisplay = 2008, 39 .hdisplay = 60, 40 .hsync_start = 60 + 8, 41 .hsync_end = 60 + 8 + 80, 42 .htotal = 60 + 8 + 80 + 40, 43 .vsync_start = 2008 + 1, 44 .vsync_end = 2008 + 1 + 15, 45 .vtotal = 2008 + 1 + 15 + 6, 46 .clock = ((60 + 8 + 80 + 40) * (2008 + 1 + 15 + 6) * 60) / 1000, 47 .type = DRM_MODE_TYPE_DRIVER, 48 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC, 49 }; 50 51 static int summit_get_modes(struct drm_panel *panel, 52 struct drm_connector *connector) 53 { 54 connector->display_info.non_desktop = true; 55 drm_object_property_set_value(&connector->base, 56 connector->dev->mode_config.non_desktop_property, 57 connector->display_info.non_desktop); 58 59 return drm_connector_helper_get_modes_fixed(connector, &summit_mode); 60 } 61 62 static const struct drm_panel_funcs summit_panel_funcs = { 63 .get_modes = summit_get_modes, 64 }; 65 66 static int summit_probe(struct mipi_dsi_device *dsi) 67 { 68 struct backlight_properties props = { 0 }; 69 struct device *dev = &dsi->dev; 70 struct summit_data *s_data; 71 int ret; 72 73 s_data = devm_drm_panel_alloc(dev, struct summit_data, panel, 74 &summit_panel_funcs, 75 DRM_MODE_CONNECTOR_DSI); 76 if (IS_ERR(s_data)) 77 return PTR_ERR(s_data); 78 79 mipi_dsi_set_drvdata(dsi, s_data); 80 s_data->dsi = dsi; 81 82 ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness); 83 if (ret) 84 return ret; 85 props.type = BACKLIGHT_RAW; 86 87 s_data->bl = devm_backlight_device_register(dev, dev_name(dev), 88 dev, s_data, &summit_bl_ops, &props); 89 if (IS_ERR(s_data->bl)) 90 return PTR_ERR(s_data->bl); 91 92 drm_panel_add(&s_data->panel); 93 94 return mipi_dsi_attach(dsi); 95 } 96 97 static void summit_remove(struct mipi_dsi_device *dsi) 98 { 99 struct summit_data *s_data = mipi_dsi_get_drvdata(dsi); 100 101 mipi_dsi_detach(dsi); 102 drm_panel_remove(&s_data->panel); 103 } 104 105 static int summit_suspend(struct device *dev) 106 { 107 struct summit_data *s_data = dev_get_drvdata(dev); 108 109 return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0); 110 } 111 112 static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend, 113 summit_set_brightness); 114 115 static const struct of_device_id summit_of_match[] = { 116 { .compatible = "apple,summit" }, 117 {}, 118 }; 119 120 MODULE_DEVICE_TABLE(of, summit_of_match); 121 122 static struct mipi_dsi_driver summit_driver = { 123 .probe = summit_probe, 124 .remove = summit_remove, 125 .driver = { 126 .name = "panel-summit", 127 .of_match_table = summit_of_match, 128 .pm = pm_sleep_ptr(&summit_pm_ops), 129 }, 130 }; 131 module_mipi_dsi_driver(summit_driver); 132 133 MODULE_DESCRIPTION("Summit Display Panel Driver"); 134 MODULE_LICENSE("GPL"); 135