1 /* 2 * Copyright (C) 2015 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 <dm.h> 10 #include <errno.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 static int video_bridge_pre_probe(struct udevice *dev) 49 { 50 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); 51 int ret; 52 53 debug("%s\n", __func__); 54 ret = gpio_request_by_name(dev, "sleep-gpios", 0, 55 &uc_priv->sleep, GPIOD_IS_OUT); 56 if (ret) { 57 debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret); 58 return ret; 59 } 60 ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE); 61 if (ret) { 62 debug("%s: Could not set sleep pull value\n", __func__); 63 return ret; 64 } 65 ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset, 66 GPIOD_IS_OUT); 67 if (ret) { 68 debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret); 69 return ret; 70 } 71 ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE); 72 if (ret) { 73 debug("%s: Could not set reset pull value\n", __func__); 74 return ret; 75 } 76 ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug, 77 GPIOD_IS_IN); 78 if (ret && ret != -ENOENT) { 79 debug("%s: Could not decode hotplug (%d)\n", __func__, ret); 80 return ret; 81 } 82 83 return 0; 84 } 85 86 int video_bridge_set_active(struct udevice *dev, bool active) 87 { 88 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev); 89 int ret; 90 91 debug("%s: %d\n", __func__, active); 92 ret = dm_gpio_set_value(&uc_priv->sleep, !active); 93 if (ret) 94 return ret; 95 if (active) { 96 ret = dm_gpio_set_value(&uc_priv->reset, true); 97 if (ret) 98 return ret; 99 udelay(10); 100 ret = dm_gpio_set_value(&uc_priv->reset, false); 101 } 102 103 return ret; 104 } 105 106 UCLASS_DRIVER(video_bridge) = { 107 .id = UCLASS_VIDEO_BRIDGE, 108 .name = "video_bridge", 109 .per_device_auto_alloc_size = sizeof(struct video_bridge_priv), 110 .pre_probe = video_bridge_pre_probe, 111 }; 112