1 /* 2 * Copyright (c) 2016 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <backlight.h> 10 #include <dm.h> 11 #include <panel.h> 12 #include <asm/gpio.h> 13 #include <power/regulator.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 struct simple_panel_priv { 18 struct udevice *reg; 19 struct udevice *backlight; 20 struct gpio_desc enable; 21 }; 22 23 static int simple_panel_enable_backlight(struct udevice *dev) 24 { 25 struct simple_panel_priv *priv = dev_get_priv(dev); 26 int ret; 27 28 debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name); 29 dm_gpio_set_value(&priv->enable, 1); 30 ret = backlight_enable(priv->backlight); 31 debug("%s: done, ret = %d\n", __func__, ret); 32 if (ret) 33 return ret; 34 35 return 0; 36 } 37 38 static int simple_panel_ofdata_to_platdata(struct udevice *dev) 39 { 40 struct simple_panel_priv *priv = dev_get_priv(dev); 41 int ret; 42 43 if (IS_ENABLED(CONFIG_DM_REGULATOR)) { 44 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev, 45 "power-supply", &priv->reg); 46 if (ret) { 47 debug("%s: Warning: cannot get power supply: ret=%d\n", 48 __func__, ret); 49 if (ret != -ENOENT) 50 return ret; 51 } 52 } 53 ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev, 54 "backlight", &priv->backlight); 55 if (ret) { 56 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret); 57 return ret; 58 } 59 ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable, 60 GPIOD_IS_OUT); 61 if (ret) { 62 debug("%s: Warning: cannot get enable GPIO: ret=%d\n", 63 __func__, ret); 64 if (ret != -ENOENT) 65 return ret; 66 } 67 68 return 0; 69 } 70 71 static int simple_panel_probe(struct udevice *dev) 72 { 73 struct simple_panel_priv *priv = dev_get_priv(dev); 74 int ret; 75 76 if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) { 77 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name); 78 ret = regulator_set_enable(priv->reg, true); 79 if (ret) 80 return ret; 81 } 82 83 return 0; 84 } 85 86 static const struct panel_ops simple_panel_ops = { 87 .enable_backlight = simple_panel_enable_backlight, 88 }; 89 90 static const struct udevice_id simple_panel_ids[] = { 91 { .compatible = "simple-panel" }, 92 { .compatible = "auo,b133xtn01" }, 93 { .compatible = "auo,b116xw03" }, 94 { .compatible = "auo,b133htn01" }, 95 { } 96 }; 97 98 U_BOOT_DRIVER(simple_panel) = { 99 .name = "simple_panel", 100 .id = UCLASS_PANEL, 101 .of_match = simple_panel_ids, 102 .ops = &simple_panel_ops, 103 .ofdata_to_platdata = simple_panel_ofdata_to_platdata, 104 .probe = simple_panel_probe, 105 .priv_auto_alloc_size = sizeof(struct simple_panel_priv), 106 }; 107