1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <edid.h> 11 #include <video_bridge.h> 12 13 int video_bridge_set_backlight(struct udevice *dev, int percent) 14 { 15 struct video_bridge_ops *ops = video_bridge_get_ops(dev); 16 17 if (!ops->set_backlight) 18 return -ENOSYS; 19 20 return ops->set_backlight(dev, percent); 21 } 22 23 int video_bridge_attach(struct udevice *dev) 24 { 25 struct video_bridge_ops *ops = video_bridge_get_ops(dev); 26 27 if (!ops->attach) 28 return -ENOSYS; 29 30 return ops->attach(dev); 31 } 32 33 int video_bridge_check_attached(struct udevice *dev) 34 { 35 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); 36 struct video_bridge_ops *ops = video_bridge_get_ops(dev); 37 int ret; 38 39 if (!ops->check_attached) { 40 ret = dm_gpio_get_value(&uc_priv->hotplug); 41 42 return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret; 43 } 44 45 return ops->check_attached(dev); 46 } 47 48 int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size) 49 { 50 struct video_bridge_ops *ops = video_bridge_get_ops(dev); 51 52 if (!ops || !ops->read_edid) 53 return -ENOSYS; 54 return ops->read_edid(dev, buf, buf_size); 55 } 56 57 static int video_bridge_pre_probe(struct udevice *dev) 58 { 59 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); 60 int ret; 61 62 debug("%s\n", __func__); 63 ret = gpio_request_by_name(dev, "sleep-gpios", 0, 64 &uc_priv->sleep, GPIOD_IS_OUT); 65 if (ret) { 66 debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret); 67 if (ret != -ENOENT) 68 return ret; 69 } 70 /* 71 * Drop this for now as we do not have driver model pinctrl support 72 * 73 * ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE); 74 * if (ret) { 75 * debug("%s: Could not set sleep pull value\n", __func__); 76 * return ret; 77 * } 78 */ 79 ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset, 80 GPIOD_IS_OUT); 81 if (ret) { 82 debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret); 83 if (ret != -ENOENT) 84 return ret; 85 } 86 /* 87 * Drop this for now as we do not have driver model pinctrl support 88 * 89 * ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE); 90 * if (ret) { 91 * debug("%s: Could not set reset pull value\n", __func__); 92 * return ret; 93 * } 94 */ 95 ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug, 96 GPIOD_IS_IN); 97 if (ret) { 98 debug("%s: Could not decode hotplug (%d)\n", __func__, ret); 99 if (ret != -ENOENT) 100 return ret; 101 } 102 103 return 0; 104 } 105 106 int video_bridge_set_active(struct udevice *dev, bool active) 107 { 108 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); 109 int ret; 110 111 debug("%s: %d\n", __func__, active); 112 ret = dm_gpio_set_value(&uc_priv->sleep, !active); 113 if (ret) 114 return ret; 115 if (active) { 116 ret = dm_gpio_set_value(&uc_priv->reset, true); 117 if (ret) 118 return ret; 119 udelay(10); 120 ret = dm_gpio_set_value(&uc_priv->reset, false); 121 } 122 123 return ret; 124 } 125 126 UCLASS_DRIVER(video_bridge) = { 127 .id = UCLASS_VIDEO_BRIDGE, 128 .name = "video_bridge", 129 .per_device_auto_alloc_size = sizeof(struct video_bridge_priv), 130 .pre_probe = video_bridge_pre_probe, 131 }; 132