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

   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#define LOG_CATEGORY UCLASS_VIDEO_BRIDGE
   8
   9#include <common.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <edid.h>
  13#include <log.h>
  14#include <video_bridge.h>
  15#include <linux/delay.h>
  16
  17int video_bridge_set_backlight(struct udevice *dev, int percent)
  18{
  19        struct video_bridge_ops *ops = video_bridge_get_ops(dev);
  20
  21        if (!ops->set_backlight)
  22                return -ENOSYS;
  23
  24        return ops->set_backlight(dev, percent);
  25}
  26
  27int video_bridge_attach(struct udevice *dev)
  28{
  29        struct video_bridge_ops *ops = video_bridge_get_ops(dev);
  30
  31        if (!ops->attach)
  32                return -ENOSYS;
  33
  34        return ops->attach(dev);
  35}
  36
  37int video_bridge_check_attached(struct udevice *dev)
  38{
  39        struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
  40        struct video_bridge_ops *ops = video_bridge_get_ops(dev);
  41        int ret;
  42
  43        if (!ops->check_attached) {
  44                ret = dm_gpio_get_value(&uc_priv->hotplug);
  45
  46                return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
  47        }
  48
  49        return ops->check_attached(dev);
  50}
  51
  52int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size)
  53{
  54        struct video_bridge_ops *ops = video_bridge_get_ops(dev);
  55
  56        if (!ops || !ops->read_edid)
  57                return -ENOSYS;
  58        return ops->read_edid(dev, buf, buf_size);
  59}
  60
  61static int video_bridge_pre_probe(struct udevice *dev)
  62{
  63        struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
  64        int ret;
  65
  66        debug("%s\n", __func__);
  67        ret = gpio_request_by_name(dev, "sleep-gpios", 0,
  68                                   &uc_priv->sleep, GPIOD_IS_OUT);
  69        if (ret) {
  70                debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
  71                if (ret != -ENOENT)
  72                        return ret;
  73        }
  74        /*
  75         * Drop this for now as we do not have driver model pinctrl support
  76         *
  77         * ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
  78         * if (ret) {
  79         *      debug("%s: Could not set sleep pull value\n", __func__);
  80         *      return ret;
  81         * }
  82         */
  83        ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
  84                                   GPIOD_IS_OUT);
  85        if (ret) {
  86                debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
  87                if (ret != -ENOENT)
  88                        return ret;
  89        }
  90        /*
  91         * Drop this for now as we do not have driver model pinctrl support
  92         *
  93         * ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
  94         * if (ret) {
  95         *      debug("%s: Could not set reset pull value\n", __func__);
  96         *      return ret;
  97         * }
  98         */
  99        ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
 100                                   GPIOD_IS_IN);
 101        if (ret) {
 102                debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
 103                if (ret != -ENOENT)
 104                        return ret;
 105        }
 106
 107        return 0;
 108}
 109
 110int video_bridge_set_active(struct udevice *dev, bool active)
 111{
 112        struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
 113        int ret = 0;
 114
 115        debug("%s: %d\n", __func__, active);
 116        if (uc_priv->sleep.dev) {
 117                ret = dm_gpio_set_value(&uc_priv->sleep, !active);
 118                if (ret)
 119                        return ret;
 120        }
 121
 122        if (!active)
 123                return 0;
 124
 125        if (uc_priv->reset.dev) {
 126                ret = dm_gpio_set_value(&uc_priv->reset, true);
 127                if (ret)
 128                        return ret;
 129                udelay(10);
 130                ret = dm_gpio_set_value(&uc_priv->reset, false);
 131        }
 132
 133        return ret;
 134}
 135
 136UCLASS_DRIVER(video_bridge) = {
 137        .id             = UCLASS_VIDEO_BRIDGE,
 138        .name           = "video_bridge",
 139        .per_device_auto        = sizeof(struct video_bridge_priv),
 140        .pre_probe      = video_bridge_pre_probe,
 141};
 142