按类别调整结构并补充 GPIO 相关函数.
Signed-off-by: rick.chan <chenyang@autoai.com>
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Devm APIs 是一组便捷易用的接口,通过该接口申请的内核资源是跟设备(device)有关的,在设备(device)被detached或者驱动(driver)卸载(unloaded)时,会被自动释放。
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## devm_kmalloc 函数
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## Memory
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### devm_kmalloc 函数
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**函数原型:**
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@ -26,7 +28,7 @@ size:要分配的内存大小,以字节为单位;
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申请成功返回有效的内存首地址,失败返回 NULL。
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## devm_kzalloc 函数
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### devm_kzalloc 函数
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**函数原型:**
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申请成功返回有效的内存首地址,失败返回 NULL。
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## devm_ioremap_resource 函数
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## IOMEM
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### devm_ioremap_resource 函数
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**函数原型:**
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Returns a pointer to the remapped memory or an ERR_PTR() encoded error code on failure.
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## devm_request_mem_region 函数
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### devm_request_mem_region 函数
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**函数原型:**
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@ -109,7 +113,7 @@ name:该 mmio 空间的名称。
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成功返回非 0 值,失败返回 NULL。
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## devm_ioremap 函数
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### devm_ioremap 函数
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**函数原型:**
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@ -134,7 +138,7 @@ size:Size of map.
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成功则返回映射内存首地址,失败返回 NULL。
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## devm_ioremap_nocache 函数
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### devm_ioremap_nocache 函数
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**函数原型:**
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成功则返回映射内存首地址,失败返回 NULL。
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## devm_request_irq 函数
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## Interrupt
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### devm_request_irq 函数
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**头文件:**
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**函数原型:**
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```c
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static inline int __must_check
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devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, unsigned long irqflags, const char *devname, void *dev_id);
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```
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@ -200,3 +207,107 @@ dev_id:该参数将会传递给 handler 所对应的回调函数。
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-INVAL:表示中断号无效或处理函数指针为NULL;
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-EBUSY:表示中断已经被占用且不能共享。
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## GPIO
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### devm_gpiod_get_index 函数
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**头文件:**
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```cpp
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#include <linux/gpio/consumer.h>
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```
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**函数原型:**
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```cpp
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struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags);
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```
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**说明:**
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Managed gpiod_get_index(). GPIO descriptors returned from this function are automatically disposed on driver detach. See gpiod_get_index() for detailed information about behavior and return values。
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**参数:**
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dev:GPIO consumer;
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con_id:function within the GPIO consumer;
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idx:index of the GPIO to obtain in the consumer;
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flags:optional GPIO initialization flags。
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**返回值:**
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See gpiod_get_index() for detailed information about behavior and return values。
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### devm_gpiod_get_index_optional 函数
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**头文件:**
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```cpp
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#include <linux/gpio/consumer.h>
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```
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**函数原型:**
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```cpp
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struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev,
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const char *con_id,
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unsigned int index,
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enum gpiod_flags flags);
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```
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**说明:**
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Managed gpiod_get_index_optional(). GPIO descriptors returned from this function are automatically disposed on driver detach. See gpiod_get_index_optional() for detailed information about behavior and return values。
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**参数:**
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dev:GPIO consumer;
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con_id:function within the GPIO consumer;
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index:index of the GPIO to obtain in the consumer;
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flags:optional GPIO initialization flags。
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**返回值:**
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See gpiod_get_index_optional() for detailed information about behavior and return values。
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### devm_gpiod_get_optional 函数
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**头文件:**
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```cpp
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#include <linux/gpio/consumer.h>
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```
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**函数原型:**
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```cpp
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struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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```
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**说明:**
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Managed gpiod_get_optional(). GPIO descriptors returned from this function are automatically disposed on driver detach. See gpiod_get_optional() for detailed information about behavior and return values。
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**参数:**
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dev:GPIO consumer;
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con_id:function within the GPIO consumer;
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flags:optional GPIO initialization flags。
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**返回值:**
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See gpiod_get_optional() for detailed information about behavior and return values。
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