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_set_backlight(struct udevice *dev, int percent)
  36 {
  37         struct simple_panel_priv *priv = dev_get_priv(dev);
  38         int ret;
  39
  40         debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
  41         dm_gpio_set_value(&priv->enable, 1);
  42         ret = backlight_set_brightness(priv->backlight, percent);
  43         debug("%s: done, ret = %d\n", __func__, ret);
  44         if (ret)
  45                 return ret;
  46
  47         return 0;
  48 }
  49
  50 static int simple_panel_ofdata_to_platdata(struct udevice *dev)
  51 {
  52         struct simple_panel_priv *priv = dev_get_priv(dev);
  53         int ret;
  54
  55         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  56                 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  57                                                    "power-supply", &priv->reg);
  58                 if (ret) {
  59                         debug("%s: Warning: cannot get power supply: ret=%d\n",
  60                               __func__, ret);
  61                         if (ret != -ENOENT)
  62                                 return ret;
  63                 }
  64         }
  65         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  66                                            "backlight", &priv->backlight);
  67         if (ret) {
  68                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  69                 return log_ret(ret);
  70         }
  71         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  72                                    GPIOD_IS_OUT);
  73         if (ret) {
  74                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  75                       __func__, ret);
  76                 if (ret != -ENOENT)
  77                         return log_ret(ret);
  78         }
  79
  80         return 0;
  81 }
  82
  83 static int simple_panel_probe(struct udevice *dev)
  84 {
  85         struct simple_panel_priv *priv = dev_get_priv(dev);
  86         int ret;
  87
  88         if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
  89                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  90                 ret = regulator_set_enable(priv->reg, true);
  91                 if (ret)
  92                         return ret;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static const struct panel_ops simple_panel_ops = {
  99         .enable_backlight       = simple_panel_enable_backlight,
 100         .set_backlight          = simple_panel_set_backlight,
 101 };
 102
 103 static const struct udevice_id simple_panel_ids[] = {
 104         { .compatible = "simple-panel" },
 105         { .compatible = "auo,b133xtn01" },
 106         { .compatible = "auo,b116xw03" },
 107         { .compatible = "auo,b133htn01" },
 108         { }
 109 };
 110
 111 U_BOOT_DRIVER(simple_panel) = {
 112         .name   = "simple_panel",
 113         .id     = UCLASS_PANEL,
 114         .of_match = simple_panel_ids,
 115         .ops    = &simple_panel_ops,
 116         .ofdata_to_platdata     = simple_panel_ofdata_to_platdata,
 117         .probe          = simple_panel_probe,
 118         .priv_auto_alloc_size   = sizeof(struct simple_panel_priv),
 119 };