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cd9c2070ea
Most panels are very simple - they just have a power supply and a backlight. Add a driver which supports this and implements the enable_backlight() method. Signed-off-by: Simon Glass <sjg@chromium.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <backlight.h>
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#include <dm.h>
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#include <panel.h>
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#include <asm/gpio.h>
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#include <power/regulator.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct simple_panel_priv {
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struct udevice *reg;
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struct udevice *backlight;
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struct gpio_desc enable;
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};
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static int simple_panel_enable_backlight(struct udevice *dev)
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{
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struct simple_panel_priv *priv = dev_get_priv(dev);
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int ret;
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dm_gpio_set_value(&priv->enable, 1);
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ret = backlight_enable(priv->backlight);
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if (ret)
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return ret;
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return 0;
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}
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static int simple_panel_ofdata_to_platdata(struct udevice *dev)
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{
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struct simple_panel_priv *priv = dev_get_priv(dev);
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int ret;
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ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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"power-supply", &priv->reg);
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if (ret) {
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debug("%s: Warning: cnnot get power supply: ret=%d\n",
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__func__, ret);
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if (ret != -ENOENT)
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return ret;
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}
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ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
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"backlight", &priv->backlight);
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if (ret) {
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debug("%s: Cannot get backlight: ret=%d\n", __func__, ret);
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return ret;
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}
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ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
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GPIOD_IS_OUT);
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if (ret) {
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debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
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__func__, ret);
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if (ret != -ENOENT)
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return ret;
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}
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return 0;
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}
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static int simple_panel_probe(struct udevice *dev)
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{
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struct simple_panel_priv *priv = dev_get_priv(dev);
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int ret;
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if (priv->reg) {
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debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name);
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ret = regulator_set_enable(priv->reg, true);
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if (ret)
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return ret;
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}
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return 0;
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}
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static const struct panel_ops simple_panel_ops = {
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.enable_backlight = simple_panel_enable_backlight,
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};
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static const struct udevice_id simple_panel_ids[] = {
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{ .compatible = "simple-panel" },
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{ }
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};
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U_BOOT_DRIVER(simple_panel) = {
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.name = "simple_panel",
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.id = UCLASS_PANEL,
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.of_match = simple_panel_ids,
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.ops = &simple_panel_ops,
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.ofdata_to_platdata = simple_panel_ofdata_to_platdata,
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.probe = simple_panel_probe,
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.priv_auto_alloc_size = sizeof(struct simple_panel_priv),
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};
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