一、注册一个平台设备
方法1：platform_device_register
核心数据结构：
1 struct platform_device { 2 const char *name; 3 int ID; 4 bool ID_auto; 5 struct device dev; 6 u32 num_resources; 7 struct resource *resource; 8 9 const struct platform_device_ID *ID_entry;10 char *driver_overrIDe; /* Driver name to force a match */11 12 /* MFD cell pointer */13 struct mfd_cell *mfd_cell;14 15 /* arch specific additions */16 struct pdev_archdata archdata;17 };VIEw Code
核心接口
1 extern int platform_device_register(struct platform_device *);VIEw Code
代码示例
static struct resource my_resoure1[]={ { .start = 0x00,.end = 0x10,.name = "resource1 MEM",.flags = IORESOURCE_MEM,},{ .start = 0x11,.end = 0x20,.name = "resource2 MEM",{ .start = 5,.end = 9,.name = "resource3 IRQ",.flags = IORESOURCE_IRQ,{ .start = 10,.end = 15,.name = "resource4 IRQ",};static struct platform_device my_device1 = { .name = "xym-test-platform-device-1",.ID = -1,.num_resources = ARRAY_SIZE(my_resoure1),.resource = my_resoure1,.dev = { .release = my_platform_device_release,//不注册此接口，卸载驱动时会报警告 .platform_data = &platform_data_1,};struct platform_device * p_device_1 = &my_device1;//device 1ret = platform_device_register(&my_device1);if (ret) { printk(KERN_INFO"Unable to device 1 register(%d)\n",ret); return ret;}VIEw Code
方法2：platform_device_register_full
核心数据结构
@H_986_301@
1 struct platform_device_info { 2 struct device *parent; 3 struct fwnode_handle *fwnode; 4 5 const char *name; 6 int ID; 7 8 const struct resource *res; 9 unsigned int num_res;10 11 const voID *data;12 size_t size_data;13 u64 dma_mask;14 };VIEw Code
核心接口
1 extern struct platform_device *platform_device_register_full(const struct platform_device_info *pdevinfo); 2 3 static inline struct platform_device *platform_device_register_simple( 4 const char *name,int ID, 5 const struct resource *res,unsigned int num) 6 7 static inline struct platform_device *platform_device_register_resndata( 8 struct device *parent,const char *name, 9 const struct resource *res,unsigned int num,10 const voID *data,size_t size)VIEw Code
代码示例
static struct resource my_resoure2[]={ { .start = 0x21,.end = 0x30,{ .start = 0x31,.end = 0x40,{ .start = 20,.end = 30,{ .start = 40,.end = 50,};static struct platform_device_info my_device_2 = { .name = "xym-test-platform-device-2",.num_res = ARRAY_SIZE(my_resoure2),.res = my_resoure2,.data = &platform_data_2,.size_data = sizeof(platform_data_2),};struct platform_device * p_device_2;//device 2p_device_2 = platform_device_register_full(&my_device_2);if (!p_device_2) { printk(KERN_INFO"Unable to device 2 register\n"); return ret;}VIEw Code
static struct resource my_resoure3[]={ { .start = 0x41,.end = 0x50,{ .start = 0x51,.end = 0x60,{ .start = 60,.end = 70,{ .start = 80,.end = 90,};struct platform_device * p_device_3;p_device_3 = platform_device_register_resndata(NulL,"xym-test-platform-device-3",-1,my_resoure3,ARRAY_SIZE(my_resoure3),&platform_data_3,sizeof(platform_data_3)); if (!p_device_3) { printk(KERN_INFO"Unable to device 3 register\n"); return ret; }VIEw Code
static struct resource my_resoure4[]={ { .start = 0x61,.end = 0x70,{ .start = 0x71,.end = 0x80,{ .start = 100,.end = 110,{ .start = 120,.end = 130,};struct platform_device * p_device_4;//device 4p_device_4 = platform_device_register_simple("xym-test-platform-device-4",-1,my_resoure4,ARRAY_SIZE(my_resoure4)); if (!p_device_4) { printk(KERN_INFO"Unable to device 4 register\n"); return ret; }VIEw Code
方法3、DTS注册
/ { platform_device_test,test{ compatible = "dts_test"; #address-cells = <1>; #size-cells = <1>; reg = <0x500 0x32>,<0x200 0x32>; reg-names = "test mem1","resource2 MEM"; interrupt-parent = <&vic0>; interrupts = <IRQ_TIMER0>,<IRQ_TIMER1>; interrupt-names = "test irq1","resource4 IRQ"; };};VIEw Code
二、获取平台设备资源
核心接口
1 extern struct resource *platform_get_resource(struct platform_device *unsigned int,unsigned int);2 extern int platform_get_irq(struct platform_device *,unsigned int);3 extern struct resource *platform_get_resource_byname(struct platform_device *,unsigned int,const char *);4 extern int platform_get_irq_byname(struct platform_device *,const char *);VIEw Code
代码示例
struct resource *presource; int irq = 0; printk(KERN_INFO"---------------------------\n"); printk(KERN_INFO"%s\n",__func__); printk(KERN_INFO"%s\n",pdev->name); if(pdev->dev.platform_data) { printk(KERN_INFO"platform_data is %d\n",*((int*)pdev->dev.platform_data)); } presource = platform_get_resource(pdev,IORESOURCE_MEM,0); if(!presource) { printk(KERN_INFO"get mem1 resource Failed\n"); return -1; } printk(KERN_INFO"resoure1 name %s\n",presource->name); printk(KERN_INFO"resoure1 start 0x%08X\n",presource->start); printk(KERN_INFO"resoure1 end 0x%08X\n",presource->end); presource = NulL; presource = platform_get_resource_byname(pdev,"resource2 MEM"); if(!presource) { printk(KERN_INFO"get mem2 resource Failed\n"); return -1; } printk(KERN_INFO"resoure1 name %s\n",presource->end); irq = platform_get_irq(pdev,0); if(irq < 0) { printk(KERN_INFO"get irq1 resource Failed\n"); return -1; } printk(KERN_INFO"irq1 value is %d\n",irq); irq = 0; irq = platform_get_irq_byname(pdev,"resource4 IRQ"); if(irq < 0) { printk(KERN_INFO"get irq2 resource Failed\n"); return -1; } printk(KERN_INFO"irq2 value is %d\n",irq); printk(KERN_INFO"---------------------------\n\n\n");VIEw Code
三、销毁设备
1 platform_device_unregister(&my_device);2 platform_device_unregister(p_device_2);VIEw Code
四、注册平台设备驱动
核心数据结构
struct platform_driver { int (*probe)(struct platform_device *); int (*remove)(struct platform_device *); voID (*shutdown)(struct platform_device *); int (*suspend)(struct platform_device *,pm_message_t state); int (*resume)(struct platform_device *); struct device_driver driver; const struct platform_device_ID *ID_table; bool prevent_deferred_probe;};VIEw Code
核心接口
platform_driver_registerVIEw Code
代码示例
static struct platform_driver my_driver1 = { .driver = { .name = "xym-test-platform-device-1",.probe = my_platform_probe,.remove = my_platform_remove,.shutdown = my_platform_shutdown,.suspend = my_platform_suspend,.resume = my_platform_resume,};ret = platform_driver_register(&my_driver1);if (ret) { printk(KERN_INFO"Unable to driver 1 register(%d)\n",ret); return ret;}VIEw Code
其中，driver中的 ”.name“ 字段和device中的 ”.name“ 相同，即可完成驱动和设备的匹配，即进入probe阶段。
结果输出
完整代码如下：
#include <linux/init.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/ioport.h>static struct resource my_resoure1[]={ { .start = 0x00,};static struct resource my_resoure2[]={ { .start = 0x21,};static struct resource my_resoure3[]={ { .start = 0x41,};static struct resource my_resoure4[]={ { .start = 0x61,};static int platform_data_1 = 1;static int platform_data_2 = 2;static int platform_data_3 = 3;static int platform_data_4 = 4;static int my_platform_probe(struct platform_device * pdev){ struct resource *presource; int irq = 0; printk(KERN_INFO"---------------------------\n"); printk(KERN_INFO"%s\n",irq); printk(KERN_INFO"---------------------------\n\n\n"); return 0;}static int my_platform_remove(struct platform_device * pdev){ printk(KERN_INFO"%s\n",__func__); return 0;}static voID my_platform_shutdown(struct platform_device *pdev){ printk(KERN_INFO"%s\n",__func__);}static int my_platform_suspend(struct platform_device * pdev,pm_message_t state){ printk(KERN_INFO"%s\n",__func__); return 0;}static int my_platform_resume(struct platform_device * pdev){ printk(KERN_INFO"%s\n",__func__); return 0;}static voID my_platform_device_release(struct device *dev){ printk(KERN_INFO"%s\n",__func__);}static struct platform_device my_device1 = { .name = "xym-test-platform-device-1",};struct platform_device * p_device_1 = &my_device1;static struct platform_driver my_driver1 = { .driver = { .name = "xym-test-platform-device-1",};static struct platform_device_info my_device_2 = { .name = "xym-test-platform-device-2",};struct platform_device * p_device_2; static struct platform_driver my_driver2 = { .driver = { .name = "xym-test-platform-device-2",.remove = my_platform_remove,.resume = my_platform_resume,};struct platform_device * p_device_3; static struct platform_driver my_driver3 = { .driver = { .name = "xym-test-platform-device-3",};struct platform_device * p_device_4; static struct platform_driver my_driver4 = { .driver = { .name = "xym-test-platform-device-4",};static struct of_device_ID oz1c007_match_table[] = { { .compatible = "dts_test"},};static struct platform_driver my_driver5 = { .driver = { .name = "xym-test-platform-device-5",.of_match_table = oz1c007_match_table,.owner = THIS_MODulE,};static int platform_device_init(voID){ int ret = 0; printk(KERN_INFO"%s\n",__func__); //device 1 ret = platform_device_register(&my_device1); if (ret) { printk(KERN_INFO"Unable to device 1 register(%d)\n",ret); return ret; } ret = platform_driver_register(&my_driver1); if (ret) { printk(KERN_INFO"Unable to driver 1 register(%d)\n",ret); return ret; } //device 2 p_device_2 = platform_device_register_full(&my_device_2); if (!p_device_2) { printk(KERN_INFO"Unable to device 2 register\n"); return ret; } ret = platform_driver_register(&my_driver2); if (ret) { printk(KERN_INFO"Unable to driver 2 register(%d)\n",ret); return ret; } //device 3 p_device_3 = platform_device_register_resndata(NulL,sizeof(platform_data_3)); if (!p_device_3) { printk(KERN_INFO"Unable to device 3 register\n"); return ret; } ret = platform_driver_register(&my_driver3); if (ret) { printk(KERN_INFO"Unable to driver 4 register(%d)\n",ret); return ret; } //device 4 p_device_4 = platform_device_register_simple("xym-test-platform-device-4",ARRAY_SIZE(my_resoure4)); if (!p_device_4) { printk(KERN_INFO"Unable to device 4 register\n"); return ret; } platform_device_add_data(p_device_4,&platform_data_4,sizeof(platform_data_4)); ret = platform_driver_register(&my_driver4); if (ret) { printk(KERN_INFO"Unable to driver 4 register(%d)\n",ret); return ret; } //device 5 dts ret = platform_driver_register(&my_driver5); if (ret) { printk(KERN_INFO"Unable to driver 5 register(%d)\n",ret); return ret; } printk(KERN_INFO"---------------------------\n\n\n"); return ret;}static voID platform_device_destory(voID){ printk(KERN_INFO"%s\n",__func__); platform_device_unregister(p_device_1); platform_device_unregister(p_device_2); platform_device_unregister(p_device_3); platform_device_unregister(p_device_4); platform_driver_unregister(&my_driver1); platform_driver_unregister(&my_driver2); platform_driver_unregister(&my_driver3); platform_driver_unregister(&my_driver4); platform_driver_unregister(&my_driver5);}static int __init platform_test_init(voID){ printk(KERN_INFO"Enter platform test\n\n"); platform_device_init(); return 0;}static voID __exit platform_test_exit(voID){ printk(KERN_INFO"Exit platform test\n"); platform_device_destory(); }module_init(platform_test_init);module_exit(platform_test_exit);MODulE_liCENSE("GPL");MODulE_AUTHOR("Marvin.xin");MODulE_DESCRIPTION("A Test Module for Platform driver");VIEw Code 总结
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