[dm][graphic] add new drivers and logo

1. Generic GPIO based backlight driver
2. Generic PWM based backlight driver
3. Simple framebuffer support
4. Standard 224-color RT-Thread logo
5. Standard 224-color RT-Thread white logo

Signed-off-by: GuEe-GUI <2991707448@qq.com>

Author: GuEe-GUI

components/drivers/graphic/backlight/Kconfig

@@ -2,6 +2,21 @@ menuconfig RT_GRAPHIC_BACKLIGHT
     bool "Backlight support"
     default n
 
+config RT_GRAPHIC_BACKLIGHT_GPIO
+    bool "Generic GPIO based backlight driver"
+    depends on RT_GRAPHIC_BACKLIGHT
+    depends on RT_USING_PIN
+    default n
+
+config RT_GRAPHIC_BACKLIGHT_PWM
+    bool "Generic PWM based backlight driver"
+    depends on RT_GRAPHIC_BACKLIGHT
+    depends on RT_USING_OFW
+    depends on RT_USING_PIN
+    depends on RT_USING_PWM
+    depends on RT_USING_REGULATOR
+    default n
+
 if RT_GRAPHIC_BACKLIGHT
     osource "$(SOC_DM_GRAPHIC_BACKLIGHT_DIR)/Kconfig"
 endif

components/drivers/graphic/backlight/SConscript

@@ -10,5 +10,11 @@ CPPPATH = [cwd + '/../../include']
 
 src     = ['backlight.c']
 
+if GetDepend(['RT_GRAPHIC_BACKLIGHT_GPIO']):
+    src += ['backlight-gpio.c']
+
+if GetDepend(['RT_GRAPHIC_BACKLIGHT_PWM']):
+    src += ['backlight-pwm.c']
+
 group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
 Return('group')

components/drivers/graphic/backlight/backlight-gpio.c

@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-02-25     GuEe-GUI     the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#define DBG_TAG "backlight.gpio"
+#define DBG_LVL DBG_INFO
+#include <rtdbg.h>
+
+struct gpio_backlight
+{
+    struct rt_backlight_device parent;
+
+    rt_base_t pin;
+    rt_uint8_t active_val;
+};
+
+#define raw_to_gpio_backlight(raw) rt_container_of(raw, struct gpio_backlight, parent)
+
+static rt_err_t gpio_backlight_update_status(struct rt_backlight_device *bl)
+{
+    rt_uint8_t brightness;
+    struct gpio_backlight *gbl = raw_to_gpio_backlight(bl);
+
+    rt_pin_mode(gbl->pin, PIN_MODE_OUTPUT);
+
+    brightness = rt_backlight_power_brightness(bl);
+
+    if (!gbl->active_val)
+    {
+        brightness = !brightness;
+    }
+
+    rt_pin_write(gbl->pin, brightness);
+
+    return RT_EOK;
+}
+
+static struct rt_backlight_ops gpio_backlight_ops =
+{
+    .update_status = gpio_backlight_update_status,
+};
+
+static rt_err_t gpio_backlight_probe(struct rt_platform_device *pdev)
+{
+    rt_err_t err;
+    rt_bool_t def_value;
+    struct rt_device *dev = &pdev->parent;
+    struct gpio_backlight *gbl = rt_calloc(1, sizeof(*gbl));
+
+    if (!gbl)
+    {
+        return -RT_ENOMEM;
+    }
+
+    def_value = rt_dm_dev_prop_read_bool(dev, "default-on");
+
+    gbl->pin = rt_pin_get_named_pin(dev, RT_NULL, 0, RT_NULL, &gbl->active_val);
+
+    if (gbl->pin < 0)
+    {
+        err = gbl->pin;
+
+        goto _fail;
+    }
+
+    /* Set the initial power state */
+    if (!dev->ofw_node || !rt_dm_dev_prop_read_bool(dev, "phandle"))
+    {
+        gbl->parent.props.power = def_value ?
+                RT_BACKLIGHT_POWER_UNBLANK : RT_BACKLIGHT_POWER_POWERDOWN;
+    }
+    else if (rt_pin_read(gbl->pin) != gbl->active_val)
+    {
+        gbl->parent.props.power = RT_BACKLIGHT_POWER_POWERDOWN;
+    }
+    else
+    {
+        gbl->parent.props.power = RT_BACKLIGHT_POWER_UNBLANK;
+    }
+
+    gbl->parent.props.max_brightness = 1;
+    gbl->parent.ops = &gpio_backlight_ops;
+
+    if ((err = rt_backlight_register(&gbl->parent)))
+    {
+        goto _fail;
+    }
+
+    rt_pin_mode(gbl->pin, PIN_MODE_OUTPUT);
+    rt_backlight_set_brightness(&gbl->parent, 1);
+
+    return RT_EOK;
+
+_fail:
+    rt_free(gbl);
+
+    return err;
+}
+
+static rt_err_t gpio_backlight_remove(struct rt_platform_device *pdev)
+{
+    struct gpio_backlight *gbl = pdev->parent.user_data;
+
+    rt_backlight_unregister(&gbl->parent);
+
+    rt_free(gbl);
+
+    return RT_EOK;
+}
+
+static const struct rt_ofw_node_id gpio_backlight_ofw_ids[] =
+{
+    { .compatible = "gpio-backlight" },
+    { /* sentinel */ }
+};
+
+static struct rt_platform_driver gpio_backlight_driver =
+{
+    .name = "gpio-backlight",
+    .ids = gpio_backlight_ofw_ids,
+
+    .probe = gpio_backlight_probe,
+    .remove = gpio_backlight_remove,
+};
+RT_PLATFORM_DRIVER_EXPORT(gpio_backlight_driver);