drivers/video/simple_panel.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2016 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <backlight.h>
   9 #include <dm.h>
  10 #include <panel.h>
  11 #include <asm/gpio.h>
  12 #include <power/regulator.h>
  13
  14 struct simple_panel_priv {
  15         struct udevice *reg;
  16         struct udevice *backlight;
  17         struct gpio_desc enable;
  18 };
  19
  20 static int simple_panel_enable_backlight(struct udevice *dev)
  21 {
  22         struct simple_panel_priv *priv = dev_get_priv(dev);
  23         int ret;
  24
  25         debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
  26         dm_gpio_set_value(&priv->enable, 1);
  27         ret = backlight_enable(priv->backlight);
  28         debug("%s: done, ret = %d\n", __func__, ret);
  29         if (ret)
  30                 return ret;
  31
  32         return 0;
  33 }
  34
  35 static int simple_panel_ofdata_to_platdata(struct udevice *dev)
  36 {
  37         struct simple_panel_priv *priv = dev_get_priv(dev);
  38         int ret;
  39
  40         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  41                 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  42                                                    "power-supply", &priv->reg);
  43                 if (ret) {
  44                         debug("%s: Warning: cannot get power supply: ret=%d\n",
  45                               __func__, ret);
  46                         if (ret != -ENOENT)
  47                                 return ret;
  48                 }
  49         }
  50         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  51                                            "backlight", &priv->backlight);
  52         if (ret) {
  53                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  54                 return ret;
  55         }
  56         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  57                                    GPIOD_IS_OUT);
  58         if (ret) {
  59                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  60                       __func__, ret);
  61                 if (ret != -ENOENT)
  62                         return ret;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int simple_panel_probe(struct udevice *dev)
  69 {
  70         struct simple_panel_priv *priv = dev_get_priv(dev);
  71         int ret;
  72
  73         if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
  74                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  75                 ret = regulator_set_enable(priv->reg, true);
  76                 if (ret)
  77                         return ret;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static const struct panel_ops simple_panel_ops = {
  84         .enable_backlight       = simple_panel_enable_backlight,
  85 };
  86
  87 static const struct udevice_id simple_panel_ids[] = {
  88         { .compatible = "simple-panel" },
  89         { .compatible = "auo,b133xtn01" },
  90         { .compatible = "auo,b116xw03" },
  91         { .compatible = "auo,b133htn01" },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(simple_panel) = {
  96         .name   = "simple_panel",
  97         .id     = UCLASS_PANEL,
  98         .of_match = simple_panel_ids,
  99         .ops    = &simple_panel_ops,
 100         .ofdata_to_platdata     = simple_panel_ofdata_to_platdata,
 101         .probe          = simple_panel_probe,
 102         .priv_auto_alloc_size   = sizeof(struct simple_panel_priv),
 103 };