WL_STATIC_IF
时间: 2024-03-31 08:31:06 浏览: 15
WL_STATIC_IF是一个C++的宏,用于在编译时进行条件判断。它可以根据给定的条件在编译时选择性地包含或排除代码块。这个宏的作用类似于if语句,但是它是在编译时进行判断,而不是在运行时。
WL_STATIC_IF的使用方式如下:
```
WL_STATIC_IF(condition)
{
// 如果condition为真,则编译这部分代码
// ...
}
WL_STATIC_ELSE
{
// 如果condition为假,则编译这部分代码
// ...
}
WL_STATIC_ENDIF
```
在编译时,如果condition为真,则编译WL_STATIC_IF块中的代码;如果condition为假,则编译WL_STATIC_ELSE块中的代码。WL_STATIC_ENDIF用于结束条件判断块。
使用WL_STATIC_IF可以根据不同的条件在编译时选择性地包含或排除代码,这在一些需要根据不同平台或配置进行编译时配置非常有用。
相关问题
static int cps_wls_register_psy(struct cps_wls_chrg_chip *chip) { struct power_supply_config cps_wls_psy_cfg = {}; struct power_supply *chg_psy = NULL; struct mtk_charger *info = NULL; chg_psy = power_supply_get_by_name("mtk-master-charger"); if (chg_psy == NULL || IS_ERR(chg_psy)) { pr_info("%s Couldn't get chg_psy\n", func); } info = (struct mtk_charger )power_supply_get_drvdata(chg_psy); if (info == NULL) { pr_info("%s Couldn't get chg_psy\n", func); } chip->boot_mode = info->bootmode; / 8 = KERNEL_POWER_OFF_CHARGING_BOOT / / 9 = LOW_POWER_OFF_CHARGING_BOOT */ if (chip->boot_mode != 8 && chip->boot_mode != 9) { cps_wls_rx_send_ept_packet(0x0B); pr_info("probe reset RX !\n"); } chip->wl_psd.name = CPS_WLS_CHRG_PSY_NAME; chip->wl_psd.type = POWER_SUPPLY_TYPE_UNKNOWN; chip->wl_psd.properties = cps_wls_chrg_props; chip->wl_psd.num_properties = ARRAY_SIZE(cps_wls_chrg_props); chip->wl_psd.get_property = cps_wls_chrg_get_property; chip->wl_psd.set_property = cps_wls_chrg_set_property; chip->wl_psd.property_is_writeable = cps_wls_chrg_property_is_writeable; chip->wl_psd.external_power_changed = cps_wls_charger_external_power_changed; cps_wls_psy_cfg.drv_data = chip; cps_wls_psy_cfg.of_node = chip->dev->of_node; chip->wl_psy = power_supply_register(chip->dev, &chip->wl_psd, &cps_wls_psy_cfg); if (IS_ERR(chip->wl_psy)) { return PTR_ERR(chip->wl_psy); } return CPS_WLS_SUCCESS; }请详细分析一下这段函数
这是一个在CPS(Charge Pump System)中注册一个无线充电器电源供应器(power supply)的函数。函数的参数是指向一个cps_wls_chrg_chip结构体的指针,该结构体包含了无线充电器的相关信息。
函数首先创建一个power_supply_config结构体,并将其初始化为空。然后通过power_supply_get_by_name函数获取名为“mtk-master-charger”的电源供应器,如果获取失败则打印错误信息。
接着,通过power_supply_get_drvdata函数获取chg_psy电源供应器的私有数据指针,该指针指向一个mtk_charger结构体。如果获取失败则打印错误信息。
然后,将无线充电器的boot_mode设置为mtk_charger的bootmode。如果boot_mode不是8或9,则调用cps_wls_rx_send_ept_packet函数发送0x0B的数据包,并打印“probe reset RX !”信息。
接下来,初始化无线充电器的电源供应器属性,包括名称、类型、属性、属性数量、获取属性函数、设置属性函数、属性是否可写和外部电源变化回调函数。
然后,创建一个power_supply_config结构体,并将其drv_data成员设置为指向cps_wls_chrg_chip结构体的指针,of_node成员设置为该结构体的of_node成员。
最后,调用power_supply_register函数注册无线充电器的电源供应器,并将其返回值作为函数的返回值。如果注册失败,则返回PTR_ERR(chip->wl_psy)。
我想做一个linux的桌面程序,是在wayland的环境下,请给我wayland协议中设置桌面的代码
好的,以下是一个简单的示例代码,用于在Wayland环境下创建一个简单的桌面:
```
#include <wayland-client.h>
#include <wayland-egl.h>
#include <wayland-cursor.h>
#include <wayland-client-protocol.h>
#include <wayland-xdg-shell-client-protocol.h>
static struct wl_display *display;
static struct wl_registry *registry;
static struct wl_compositor *compositor;
static struct xdg_wm_base *wm_base;
static struct wl_surface *surface;
static struct xdg_surface *xdg_surface;
static struct xdg_toplevel *xdg_toplevel;
static void registry_global(void *data, struct wl_registry *registry, uint32_t id, const char *interface, uint32_t version)
{
if (strcmp(interface, "wl_compositor") == 0) {
compositor = wl_registry_bind(registry, id, &wl_compositor_interface, 4);
} else if (strcmp(interface, "xdg_wm_base") == 0) {
wm_base = wl_registry_bind(registry, id, &xdg_wm_base_interface, 1);
}
}
static void registry_global_remove(void *data, struct wl_registry *registry, uint32_t id)
{
// do nothing
}
static const struct wl_registry_listener registry_listener = {
registry_global,
registry_global_remove
};
int main(int argc, char *argv[])
{
// connect to the Wayland display server
display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "Failed to connect to Wayland display\n");
return -1;
}
// get the registry object
registry = wl_display_get_registry(display);
if (registry == NULL) {
fprintf(stderr, "Failed to get Wayland registry\n");
wl_display_disconnect(display);
return -1;
}
// add listener for registry events
wl_registry_add_listener(registry, ®istry_listener, NULL);
// roundtrip to get global objects
wl_display_roundtrip(display);
if (compositor == NULL || wm_base == NULL) {
fprintf(stderr, "Failed to get required Wayland objects\n");
wl_registry_destroy(registry);
wl_display_disconnect(display);
return -1;
}
// create a Wayland surface
surface = wl_compositor_create_surface(compositor);
if (surface == NULL) {
fprintf(stderr, "Failed to create Wayland surface\n");
wl_registry_destroy(registry);
wl_display_disconnect(display);
return -1;
}
// create an xdg surface
xdg_surface = xdg_wm_base_get_xdg_surface(wm_base, surface);
if (xdg_surface == NULL) {
fprintf(stderr, "Failed to create xdg surface\n");
wl_registry_destroy(registry);
wl_display_disconnect(display);
return -1;
}
// create an xdg toplevel
xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
if (xdg_toplevel == NULL) {
fprintf(stderr, "Failed to create xdg toplevel\n");
wl_registry_destroy(registry);
wl_display_disconnect(display);
return -1;
}
// set the window title
xdg_toplevel_set_title(xdg_toplevel, "My Wayland Desktop");
// set the window size
xdg_toplevel_set_min_size(xdg_toplevel, width, height);
xdg_toplevel_set_max_size(xdg_toplevel, width, height);
// show the window
wl_surface_commit(surface);
xdg_toplevel_set_active(xdg_toplevel);
// enter the Wayland event loop
while (wl_display_dispatch(display) != -1) {
// do nothing
}
// cleanup
xdg_toplevel_destroy(xdg_toplevel);
xdg_surface_destroy(xdg_surface);
wl_surface_destroy(surface);
wl_registry_destroy(registry);
wl_display_disconnect(display);
return 0;
}
```
这段代码使用Wayland的 Compositor 和 XDG Shell 协议来创建一个简单的窗口,并设置窗口的标题和大小,最后进入 Wayland 的事件循环。需要注意的是,这只是一个简单的示例代码,实际的桌面程序可能需要更复杂的功能和交互方式。