驱动编写流程图(精炼)

1、struct platform_drigr s5pcl00_adc_driyer = .probe = | s5pcl6o_adpr 岳叩.name = Ms5pcl00-adcife ¥ platf orm_de vice *1 % 个 IORESOURCE_MEM 资擦： res_mem = platformgetresoupdev, IORESOURCE_MEM? 0)； 获Wplatform.device U!第:个IORESOURCERQ资源； resjrq = platformesourcefpdev, I0RES0URC6JRQ, 1)； 映易adt奇存器物理區为内核的

2、虚拟堆址:adcbase = ioremapfresmemstart, resmem-nd - res_mem->start)； 向石核中iAadc山断资艇 注册adc屮赵理旳数顶半应ret = requestq(re$rq>start,| ack interrupt, |4«¥=CiSABLED, ”adc”，NULL)； 注册字符设备： registerchrdevregionldevno, number_of_device, ”ack') 初始化辻JWcdev：cdev_init(&cdev, &s5pclOO_ad jfops)；

3、 cdev.owner = THIS.MODULE； ret = cdev add(&cdev, dev no z number_of device)； 获紂adW亍钟控制结构体.井IHJjdcHf+： elk = clk_get NULL, "adn； clk_enable(clk)；return IRQ_HANDLED;模块川战函故：static int _init sSpclOOm 75jnit(void)return i2jadd-driver( I&lm75_driyerhstatic struct fileoperations Im75_fops = .o

4、wner = THIS_MODULE,-jlm75_readj .open = Im75_open, .release = Im75eleas©；static int Im75_read_value(struct i2c_dient -client)支持include <linux/module.h> include <linux/kemel.h> include <linux/init.h> include <linux/fs.h> include <linux/cdev.h> include <linux/i2c.

5、h> 稈include <linux/slab.h> 務include <asm/uaccess.h>初始化cdev结 <rfite_opertionsrdpjdjalp划 & 叶75芮);struct i2c_msg msgs2； int status；char bufl2；char buf2 ;第个河息的长度: msgsO.len = 1； 器件堆址： msgsO.addr = client->addr； 写入数据： msgsO.flags = O；/write 消息缓冲区: msgsO.buf = bufl； 消总怪片内地址0X00： m

6、sgs0.buf0 = 0x0： 第：个河息ffJKtt： msgsl).len = 2； 器件炮址： msgsl.addr = client->addr；msgsl.flags = i2C_M_RD；/read息的级冲衣：' msgsl.buf = buf2； 发送河息： status = i2cansfQr(dient>adapter, msgs, 2)；返回:return (buf20 « 8) | buf2l； b>二T卄J4.yh” <<j w 4” w j w ify W :Ai*><F.*亠7Z CXC： k JB7&q

7、uot; 3 «M .：k Y = K“ rre.L 二 <5=°.%S*f % *" >l»«4ew <« 一*r<*s比:以"员k4«rv*ee mm ”iT 7*. I.mm ”7*. 5tat: = ：Cc_re»xster_adaptex'adap): icagr xkxesut = HZ：urztzre ka ”. ;：c这.frit?- »rl: SMP- S SUS = 一 ：丨xcap- &ev. tz?c = 4i2c.sGaptcr_

8、t7PCxcs = devicc_rctxztcr Icirj- icv : Ixtrxi 2：jde*xfo ( xr*ct llitjxit llrt: U? Jus: xtr*ct 2：j>x< jsfo U<x<_uc：:ruct tus.tTje iZc.Ous.t/pe = .Z£D«=士 c".-aitcb=12c_devicejxa：ch.pi*=12c.device_proe.reoyre=12c_device_rexove.=12c.device_51ntfl3Tn.R=fii2c_deviceja_op5.）；-LXS

9、TJCmD '_12c.boareL115：>:L iCz.scarCtf-li»t-£ss,_cach_cn .£ <cc»insa- zxnus =s setter- nr dtv.czr litdeptCT- £cv, "Ctx t exeatec tdiptcx. fcicvinf©- bccrduiafoIc.ner.aevice :rxtadap. struct ：Zc tinfo)cl,ent = X：alloc(51:eof cliext. CTPJZZOTLi： i|'i/jdl

10、nt* dlen：- cllen：- dlen：- dlen：- dlen：-a flap: er = a flap: fiev. pla:forseata = :fo- platfcrx_da:a: flas： = info- flijs: afifir = info- Sir:Ixq = lnfo->lr:oarOlnfo const:us_fcr_each_drv - t12c_t>us_t>-pe. NVLL. sfi&p. « r»ce:s_xev.ai3ipTeri:strlcpyicllen：- pase. =o-21:eof(cli

11、ent- naxe)：:dlen：- Oev. bus 彳 McjDctRe |dlen：- dev. type = iCc.cLiext.tTe;dev-:e:_nasei4cllen：- eer.l：c_adapter_ld'adap), client- afifir>:staxus = aevice_re515ter icliezt- dev；little itt eccx:r»s«trT x*:t «»：c.cr;vcz *1 y &«<uttu lit :2«.u.&i4_»4S

12、7：cr stsxxt tic.eivcz 'tomr. stsxxty结驱动程序编写流程:模块加载函数；static int _init s5pcl00_led_init(void)static struct file_operations s5pcl00_led_ops = o wner> static int s5pcl00Jed_open(struct inode *inode, struct file *file)；生成设备号；MKDEV(led_majorz led_minor);注册设备号，设备号名；register_chrdev_region(devno, 1,

13、"s5pcl00_led")；初始化cdev,结合file operti ons；cdev_init( &Cdevz&s5pcl00 led ops注册cdev,设备号； cdev add(&cdev, dev no, 1);.ope n .release .ioctlTHIS_MODULE, s5pc200ed_ope n, s5pclOO led closi7 s5pcl00_ledo ctl 卞GPIO初始化为IO模式;lednit();返回：return 0;static int s5pcl00_led_ioctl(struct inode

14、*inode, struct file *file, unsigned int cmd, unsigned long arg)switchlcmdstatic void led_init(void)writel(readl(S5PC100_GPG3_BASE) & 0xF) | 0x1, S5PC100_GPG3_BASE); static void led_ on (void)case LED ON:led_on();break;case LED_OFF:led_off();break;default: break;writel(readl(S5PC100_GPG3_BASE + 4

15、) | 0x1), S5PC100_GPG3_BASE + 4); static void led_off(void)writel(readl(S5PC100_GPG3_BASE + 4) & 0xl)z S5PC100_GPG3_BASE + 4); r返回：return 0;返回：return 0;向内核注册设备号register_chrdev_region（设备号，连续申请儿个设备号，设备号名称）cdev初始华；丨+cdev_init（cdev 结构体指针， file_opertions 结构体指针）；向内核注册cdev结构；cdev_add（ cdev结构体指针，设备号，连续注

16、册儿个次设备）初始化信号量为“1” ； 用于资源尹发访级控制；semanit（ &Sem *初始花读等待队列头;init_waitqueue_head（ |&r_wait |4r 初跖化写等待丛列头;一init_waitqueue_head（ |&w_wait ）7结束struct cdev cdev；struct file_opertions fops = .owner = THIS_MODULE, .read = xxx_read, .wirte = xxx_write,.ope n = xxx_ope n, .releasy = hello_release, .p

17、oll = globalfifo_poll, ；'waitstatic unsigned int globalfifo_poll( struct file *filp, poll_table获得信号量；dow n(&sem);&r wait wait Y,驱动增加等待队列到poll table结构 poll_wait( filp,poll_wait( filp,一wait一if (丧备可读)mask | = POLLIN | POLLRDNORM;/*标示数据可获得*7 if (设备可写)mask |=POLLOUT | POLLWRNORM;/*标示数据可写入*/ 释

18、放信号量；up(&dev->sem);返回设备状态，给轮询的进程；return mask;rexumO;static int _init s3c64xx_spi_probe(struct platform_device *pdev)SpLdrvier注册过程static struct spi_drivQm25pl0a_griver = master = spi_alloc_master(&pdevxkv, sizeof(struct s3c64xx_spi_dnver_data)；master->bus num = pdev-xd； master->setup

19、 = s3c64xx_spi_setup； master->transfer = s3c64xx_spi_transfer； master->num_chipselect = sci-x)um_cs； masterdmaalignment = 8；spi_register_driver( | &m25pioa,driver 十 sdrv->driver.bus = if (sdrv->probe) sdrv->be = | spi_drv_probe； if (sdrv->remove)sdrv->driver.remove

20、 = spi_drv_remove；&spi bus type； I.probe = I m25plOa_probe, .remove = m25pl0a_remove, .driver = .name = m25plOa,spiegister_master(master)> deviceaddfmaster-xiev)；> static UST_HEAD(boardist)；driver_register(&sdrv->driver)；struct bus_type spi_bus_type = .name .dev_attrs .matchispi：=sp

21、i_dev_attrs,=spi_match_device,.uevent=spi_uevent,.suspend=spi_suspend,.resume=spi_resume,结束scan_boardinfo(master)(ii5t_for_each_entry( bi, | &bonrd.lbt. | l/t ) fstruct sp»_00Br(3jnfo = ”>ooard.ro; urtsnedn;for (n bhn.y d.rrto; n> 0;rv. chip+f)( <f(<hip->bu5_num != nw5ter->

22、;Ou5_nurH) continue：Other = driver_find(drv->name, drv->bus)； 黃看drivers否被注册过了如果注册了.返町EBUSY； bus_add_driver( Struct device_driver drv)；|vo>d) sp new devicem82terf chip);driver_attach(Struct device_driver drv)；struct spi_cer.ce *spi.nejievruct spimaster master, struct 5pi_boBrc_mfo chipnroxy

23、= %p B”oc_cevce(rrater); t| i 讷 sp_devicestatus = spiadddeviceproxjj;- device_ocd(3piAcle¥);static int spi_drv_probe(struct device 4dev)const struct spi_drigr sdrv 二 to_spi_driveqdzAReturn I sdrv->pfobe(to_spi-device(dev)； "i river)；bus_for_each_dev( drvbus, NULL, drv, | _driverattach )

24、；为drv,历诉有deQ：试匹砒人体匹配冇何调卜焉数_drive jauach完成_driver_attach(struct device *dev, void data);driver_match_device(stnjct devicedriver *drvz struct device *dev)return drv->bus->match ? drv->bus->match(dev, drv): 1； drv->probe(dev)；调用 platfbrm.driver->be(dev)函数:并JL传入dev給构。 3S 4ywx

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30、M Ifjn »<返I叫 return 0；应用程序编写流程结束static Struct net_device vnetdev；«tindude <8inux/module/i> itindude dnux/ermo.h> ttindude <inux/netdevice.h> ttindude <anux/etherdetice.h> ttindude <flnux/kemel.h> ttindude <flnux/types.h> itindude <anux/fcnti.h> ttindude <inux/interrupth> ttindude <ftnu/ioportn> itindude <anux/in.h> itindude <anux/s*i>u