drivers/video/bridge/video-bridge-uclass.c

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