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 <log.h>
  11 #include <panel.h>
  12 #include <asm/gpio.h>
  13 #include <power/regulator.h>
  14
  15 struct simple_panel_priv {
  16         struct udevice *reg;
  17         struct udevice *backlight;
  18         struct gpio_desc enable;
  19 };
  20
  21 static int simple_panel_enable_backlight(struct udevice *dev)
  22 {
  23         struct simple_panel_priv *priv = dev_get_priv(dev);
  24         int ret;
  25
  26         debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
  27         dm_gpio_set_value(&priv->enable, 1);
  28         ret = backlight_enable(priv->backlight);
  29         debug("%s: done, ret = %d\n", __func__, ret);
  30         if (ret)
  31                 return ret;
  32
  33         return 0;
  34 }
  35
  36 static int simple_panel_set_backlight(struct udevice *dev, int percent)
  37 {
  38         struct simple_panel_priv *priv = dev_get_priv(dev);
  39         int ret;
  40
  41         debug("%s: start, backlight = '%s'\n", __func__, priv->backlight->name);
  42         dm_gpio_set_value(&priv->enable, 1);
  43         ret = backlight_set_brightness(priv->backlight, percent);
  44         debug("%s: done, ret = %d\n", __func__, ret);
  45         if (ret)
  46                 return ret;
  47
  48         return 0;
  49 }
  50
  51 static int simple_panel_of_to_plat(struct udevice *dev)
  52 {
  53         struct simple_panel_priv *priv = dev_get_priv(dev);
  54         int ret;
  55
  56         if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
  57                 ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
  58                                                    "power-supply", &priv->reg);
  59                 if (ret) {
  60                         debug("%s: Warning: cannot get power supply: ret=%d\n",
  61                               __func__, ret);
  62                         if (ret != -ENOENT)
  63                                 return ret;
  64                 }
  65         }
  66         ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
  67                                            "backlight", &priv->backlight);
  68         if (ret) {
  69                 debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
  70                 return log_ret(ret);
  71         }
  72         ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
  73                                    GPIOD_IS_OUT);
  74         if (ret) {
  75                 debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
  76                       __func__, ret);
  77                 if (ret != -ENOENT)
  78                         return log_ret(ret);
  79         }
  80
  81         return 0;
  82 }
  83
  84 static int simple_panel_probe(struct udevice *dev)
  85 {
  86         struct simple_panel_priv *priv = dev_get_priv(dev);
  87         int ret;
  88
  89         if (IS_ENABLED(CONFIG_DM_REGULATOR) && priv->reg) {
  90                 debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
  91                 ret = regulator_set_enable(priv->reg, true);
  92                 if (ret)
  93                         return ret;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static const struct panel_ops simple_panel_ops = {
 100         .enable_backlight       = simple_panel_enable_backlight,
 101         .set_backlight          = simple_panel_set_backlight,
 102 };
 103
 104 static const struct udevice_id simple_panel_ids[] = {
 105         { .compatible = "simple-panel" },
 106         { .compatible = "auo,b133xtn01" },
 107         { .compatible = "auo,b116xw03" },
 108         { .compatible = "auo,b133htn01" },
 109         { .compatible = "boe,nv140fhmn49" },
 110         { .compatible = "lg,lb070wv8" },
 111         { }
 112 };
 113
 114 U_BOOT_DRIVER(simple_panel) = {
 115         .name   = "simple_panel",
 116         .id     = UCLASS_PANEL,
 117         .of_match = simple_panel_ids,
 118         .ops    = &simple_panel_ops,
 119         .of_to_plat     = simple_panel_of_to_plat,
 120         .probe          = simple_panel_probe,
 121         .priv_auto      = sizeof(struct simple_panel_priv),
 122 };