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         debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
  29         dm_gpio_set_value(&priv->enable, 1);
  30         ret = backlight_enable(priv->backlight);
  31         debug("%s: done, ret = %d\n", __func__, ret);
  32         if (ret)
  33                 return ret;
  34
  35         return 0;
  36 }
  37
  38 static int simple_panel_ofdata_to_platdata(struct udevice *dev)
  39 {
  40         struct simple_panel_priv *priv = dev_get_priv(dev);
  41         int ret;
  42
  43         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  44                 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  45                                                    "power-supply", &priv->reg);
  46                 if (ret) {
  47                         debug("%s: Warning: cannot get power supply: ret=%d\n",
  48                               __func__, ret);
  49                         if (ret != -ENOENT)
  50                                 return ret;
  51                 }
  52         }
  53         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  54                                            "backlight", &priv->backlight);
  55         if (ret) {
  56                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  57                 return ret;
  58         }
  59         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  60                                    GPIOD_IS_OUT);
  61         if (ret) {
  62                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  63                       __func__, ret);
  64                 if (ret != -ENOENT)
  65                         return ret;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static int simple_panel_probe(struct udevice *dev)
  72 {
  73         struct simple_panel_priv *priv = dev_get_priv(dev);
  74         int ret;
  75
  76         if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
  77                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  78                 ret = regulator_set_enable(priv->reg, true);
  79                 if (ret)
  80                         return ret;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static const struct panel_ops simple_panel_ops = {
  87         .enable_backlight       = simple_panel_enable_backlight,
  88 };
  89
  90 static const struct udevice_id simple_panel_ids[] = {
  91         { .compatible = "simple-panel" },
  92         { .compatible = "auo,b133xtn01" },
  93         { .compatible = "auo,b116xw03" },
  94         { .compatible = "auo,b133htn01" },
  95         { }
  96 };
  97
  98 U_BOOT_DRIVER(simple_panel) = {
  99         .name   = "simple_panel",
 100         .id     = UCLASS_PANEL,
 101         .of_match = simple_panel_ids,
 102         .ops    = &simple_panel_ops,
 103         .ofdata_to_platdata     = simple_panel_ofdata_to_platdata,
 104         .probe          = simple_panel_probe,
 105         .priv_auto_alloc_size   = sizeof(struct simple_panel_priv),
 106 };