drivers/video/simple_panel.c

   1 /*
   2  * Copyright (c) 2016 Google, Inc
   3  * Written by Simon Glass <[email protected]>
   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         dm_gpio_set_value(&priv->enable, 1);
  29         ret = backlight_enable(priv->backlight);
  30         if (ret)
  31                 return ret;
  32
  33         return 0;
  34 }
  35
  36 static int simple_panel_ofdata_to_platdata(struct udevice *dev)
  37 {
  38         struct simple_panel_priv *priv = dev_get_priv(dev);
  39         int ret;
  40
  41         ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  42                                            "power-supply", &priv->reg);
  43         if (ret) {
  44                 debug("%s: Warning: cnnot get power supply: ret=%d\n",
  45                       __func__, ret);
  46                 if (ret != -ENOENT)
  47                         return ret;
  48         }
  49         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  50                                            "backlight", &priv->backlight);
  51         if (ret) {
  52                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  53                 return ret;
  54         }
  55         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  56                                    GPIOD_IS_OUT);
  57         if (ret) {
  58                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  59                       __func__, ret);
  60                 if (ret != -ENOENT)
  61                         return ret;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int simple_panel_probe(struct udevice *dev)
  68 {
  69         struct simple_panel_priv *priv = dev_get_priv(dev);
  70         int ret;
  71
  72         if (priv->reg) {
  73                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  74                 ret = regulator_set_enable(priv->reg, true);
  75                 if (ret)
  76                         return ret;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static const struct panel_ops simple_panel_ops = {
  83         .enable_backlight       = simple_panel_enable_backlight,
  84 };
  85
  86 static const struct udevice_id simple_panel_ids[] = {
  87         { .compatible = "simple-panel" },
  88         { }
  89 };
  90
  91 U_BOOT_DRIVER(simple_panel) = {
  92         .name   = "simple_panel",
  93         .id     = UCLASS_PANEL,
  94         .of_match = simple_panel_ids,
  95         .ops    = &simple_panel_ops,
  96         .ofdata_to_platdata     = simple_panel_ofdata_to_platdata,
  97         .probe          = simple_panel_probe,
  98         .priv_auto_alloc_size   = sizeof(struct simple_panel_priv),
  99 };