drivers/video/simple_panel.c

   1 /*
   2  * Copyright (c) 2016 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 <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         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  42                 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  43                                                    "power-supply", &priv->reg);
  44                 if (ret) {
  45                         debug("%s: Warning: cnnot get power supply: ret=%d\n",
  46                               __func__, ret);
  47                         if (ret != -ENOENT)
  48                                 return ret;
  49                 }
  50         }
  51         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  52                                            "backlight", &priv->backlight);
  53         if (ret) {
  54                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  55                 return ret;
  56         }
  57         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  58                                    GPIOD_IS_OUT);
  59         if (ret) {
  60                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  61                       __func__, ret);
  62                 if (ret != -ENOENT)
  63                         return ret;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static int simple_panel_probe(struct udevice *dev)
  70 {
  71         struct simple_panel_priv *priv = dev_get_priv(dev);
  72         int ret;
  73
  74         if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
  75                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  76                 ret = regulator_set_enable(priv->reg, true);
  77                 if (ret)
  78                         return ret;
  79         }
  80
  81         return 0;
  82 }
  83
  84 static const struct panel_ops simple_panel_ops = {
  85         .enable_backlight       = simple_panel_enable_backlight,
  86 };
  87
  88 static const struct udevice_id simple_panel_ids[] = {
  89         { .compatible = "simple-panel" },
  90         { .compatible = "auo,b133xtn01" },
  91         { }
  92 };
  93
  94 U_BOOT_DRIVER(simple_panel) = {
  95         .name   = "simple_panel",
  96         .id     = UCLASS_PANEL,
  97         .of_match = simple_panel_ids,
  98         .ops    = &simple_panel_ops,
  99         .ofdata_to_platdata     = simple_panel_ofdata_to_platdata,
 100         .probe          = simple_panel_probe,
 101         .priv_auto_alloc_size   = sizeof(struct simple_panel_priv),
 102 };