自娱自乐8之Linux UDC驱动4（自编udc驱动，基本功能完成）
直接上代码，可以和我之前写的模板比较比较
/*********************************** Copyright(C), 2013 LDP FileName: s3c2440_udc.c Author: wwxxxxll Date: Description: linux-3.2-36 History: Author Date Desc************************************/#include <linux/module.h>//MODULE_*#include <linux/init.h>//printInfo#include <linux/slab.h>//kzalloc() kfree()#include <linux/usb/gadget.h>//struct usb_gadget等#include <linux/clk.h>//struct clk#include <linux/platform_device.h>//platform#include <linux/ioport.h>#include <linux/interrupt.h>#include <linux/delay.h>#include <linux/prefetch.h>#include <asm/irq.h>#include <asm/io.h>//ioremap#include <mach/regs-gpio.h>#include "s3c2440_udc.h"#ifdef S3C2440_DEBUG_FS#include <linux/debugfs.h>#include <linux/seq_file.h>//seq_printf seq_read#endif#define DRIVER_DESC "S3C2440 USB Device Controller Gadget"#define DRIVER_VERSION "2013"#define DRIVER_AUTHOR "wwxxxxll"static const char gadget_name[] = "s3c2440_udc";static const char driver_desc[] = DRIVER_DESC;//根据实际情况修改//在epautoconf.c会看到/* type-restriction: "-iso", "-bulk", or "-int". * direction-restriction: "in", "out". *///我们static const char ep0name[] = "ep0";static const char * const ep_name[] = { ep0name, "ep1-bulk", "ep2-bulk", "ep3-bulk", "ep4-bulk",};//需要mount -t debugfs none /sys/kernel/debug////sys/kernel/debug#ifdef S3C2440_DEBUG_FSstatic struct dentry *s3c2440_udc_debugfs_root;static int s3c2440_udc_debugfs_seq_show(struct seq_file *m, void *p){ seq_printf(m, "My name is %s\n", gadget_name); return 0;}static int s3c2440_udc_debugfs_fops_open(struct inode *inode, struct file *file){ return single_open(file, s3c2440_udc_debugfs_seq_show, NULL);}static const struct file_operations s3c2440_udc_debugfs_fops = { .open = s3c2440_udc_debugfs_fops_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE,};#endif/***********************hardware_handler************************///s3c2440没有控制usb开启位，就等到start时使能中断,imx不是这样static void s3c2440_usb_reset(struct s3c2440_udc *dev){ //disable intterupt WRITE_REG(dev, EP_INT_EN_REG, 0x00); WRITE_REG(dev, USB_INT_EN_REG, 0x00); //clear intterupt flag WRITE_REG(dev, EP_INT_REG, 0x1f); WRITE_REG(dev, USB_INT_REG, 0x07); PULL_DOWN(); dev->gadget.speed = USB_SPEED_UNKNOWN;}static void s3c2440_udc_enable(struct s3c2440_udc *dev){ int i; dev->gadget.speed = USB_SPEED_FULL;//s3c2440只支持1.1 for (i = 0; i < S3C2440_ENDPOINTS; i++)//最大包设置 { WRITE_REG(dev, INDEX_REG, i); WRITE_REG(dev, MAXP_REG, dev->ep[i].ep.maxpacket >> 3); } //SETB(dev, PWR_REG, 0);//enable suspend模式 //enable intterupt SETB(dev, EP_INT_EN_REG, 0); WRITE_REG(dev, USB_INT_EN_REG, 0x07);#ifndef S3C2440_NEWSTYLE PULL_UP();#endif}static void s3c2440_usb_fifocnt(struct s3c2440_udc *dev, u32 *fifo_size){ *fifo_size = READ_REG(dev, OUT_FIFO_CNT1); *fifo_size |= READ_REG(dev, OUT_FIFO_CNT2) << 8;}static u32 s3c2440_read_ctrlq(struct s3c2440_udc *dev, struct usb_ctrlrequest *_ctrlq){ u32 count; WRITE_REG(dev, INDEX_REG, 0); s3c2440_usb_fifocnt(dev, &count); count = (count > sizeof(struct usb_ctrlrequest)) ? sizeof(struct usb_ctrlrequest) : count; readsb(EP0_FIFO + dev->virl_addr, (unsigned char *)_ctrlq, count); /* _ctrlq->bRequest bit7： 方向 10 int 0: out bit 6:5： 请求类型 bit 4:0： 接收者 */ printInfo( "Host: bRequest = %02x bRequestType = %02x \wValue = 0x%x wIndex=0x%x wLength=0x%x\n", _ctrlq->bRequest, _ctrlq->bRequestType, \ _ctrlq->wValue, _ctrlq->wIndex, _ctrlq->wLength); return count;}static int s3c2440_get_status(struct s3c2440_udc *dev, struct usb_ctrlrequest *crq){u16 status = 0;u8 ep_num = crq->wIndex & 0x7F;//端点号u8 is_in = crq->wIndex & USB_DIR_IN;//方向switch (crq->bRequestType & USB_RECIP_MASK) {case USB_RECIP_INTERFACE://2.0为预留break;case USB_RECIP_DEVICE://设备状态是0位表示供电方式，1位表示是否可以远程唤醒status = dev->devstatus;break;case USB_RECIP_ENDPOINT://0位表示halt，如果当前的ep为halt，此位为1if (ep_num > 4 || crq->wLength > 2)//crq->wLength为2return 1;WRITE_REG(dev, INDEX_REG, ep_num);status = 0;if (ep_num == 0) {status = GETB(dev, EP0_CSR, 5);} else {if (is_in) {status = GETB(dev, IN_CSR1_REG, 4);} else {status = GETB(dev, OUT_CSR1_REG, 5);}}break;default:return 1;}WRITE_REG(dev, EP0_FIFO, status & 0xFF);WRITE_REG(dev, EP0_FIFO, status >> 8); EP0_SETIPR(dev); EP0_SETDE(dev);return 0;}static void s3c2440_udc_done(struct s3c2440_ep *ep, struct s3c2440_request *req, int status);/*返回1： 读包结束0： 还没读完-1： 错误*/static int s3c2440_read_fifo(struct s3c2440_udc *dev, struct s3c2440_ep *ep, struct s3c2440_request *req){ u32 fifo_reg; u8 *buf; u32 idx = 0; u32 avail, len, bufspace; u32 fifo_count = 0; int ret = 0; //printInfo( "%s\n", __func__); idx = ep->bEndpointAddress & 0x7f; if (idx > 4) { idx = 0; }WRITE_REG(dev, INDEX_REG, idx);s3c2440_usb_fifocnt(dev, &fifo_count);if (fifo_count == 0){return 0;} fifo_reg = EP0_FIFO + 4 * idx; if (req->req.length == 0) { return 1; } if (req->req.length <= req->req.actual) { return -1; } bufspace = req->req.length - req->req.actual; buf = req->req.buf + req->req.actual; avail = (fifo_count > ep->ep.maxpacket) ? ep->ep.maxpacket : fifo_count;//一次最多读ep->ep.maxpacket len = (bufspace < avail) ? bufspace : avail; req->req.actual += len; readsb(fifo_reg + dev->virl_addr, buf, len); //req->req.actual已接收长度，req->req.length要接收的总长度 //printInfo("read: fifo_count = %d, req->req.actual = %d, req->req.length = %d len = %d avail = %d\n", fifo_count, req->req.actual, req->req.length, len, avail); if (fifo_count < ep->ep.maxpacket) { ret = 1; if (len != avail) { req->req.status = -EOVERFLOW;//溢出 } } if (ret) { if (idx == 0) { EP0_SETDE(dev); ep->dev->ep0state = EP0_IDLE; } else {CLRB(dev, OUT_CSR1_REG, 0); } s3c2440_udc_done(ep, req, 0); } else { if (idx == 0) { EP0_CLROPR(dev); } else {//SETB(dev, OUT_CSR1_REG, 4);CLRB(dev, OUT_CSR1_REG, 0); } } return ret;}#ifdef DEBUGstatic int printDesc = 0;#endifstatic int s3c2440_write_fifo(struct s3c2440_udc *dev, struct s3c2440_ep *ep, struct s3c2440_request *req){ u32 fifo_reg; u8 *buf; u32 idx = 0; u32 len; int ret = 0; struct usb_device_descriptor *desc; struct usb_string_descriptor *string; struct usb_config_descriptor *config; u16 language; u32 n; u8 *tmp;#ifdef DEBUG //printInfo( "%s\n", __func__); switch (printDesc) { case USB_DT_DEVICE: desc = (struct usb_device_descriptor*)req->req.buf; printInfo( "Slave: length = %d Vendor = %x Product = %x Device = %x iManufacturer = %d iProduct = %d iSerialNumber = %d bNumConfigurations = %d\n", \ desc->bLength, le16_to_cpu(desc->idVendor), le16_to_cpu(desc->idProduct), le16_to_cpu(desc->bcdDevice),\ desc->iManufacturer,desc->iProduct,desc->iSerialNumber,desc->bNumConfigurations); break; case USB_DT_DEVICE_QUALIFIER: break; case USB_DT_OTHER_SPEED_CONFIG: break; case USB_DT_CONFIG: config = (struct usb_config_descriptor *)req->req.buf; printInfo( "Slave: length = %d TotalLength = %d NumInterfaces = %d ConfigurationValue = %d iConfiguration = %d bMaxPower = %d\n", \ config->bLength, le16_to_cpu(config->wTotalLength), config->bNumInterfaces, config->bConfigurationValue, config->iConfiguration, config->bMaxPower); break; case USB_DT_STRING: string = (struct usb_string_descriptor *)req->req.buf; printInfo( "Slave: length = %d\n", string->bLength); language = cpu_to_le16(0x0409);//这里偷工减料了，因为gadget是我自己写的我知道是什么语言 if (string->bLength == 4)//支持语言数量 { break; } for (tmp = (u8 *)string->wData, n = 0; n < string->bLength; n++, tmp++) { if (*tmp == language) { } else { printInfo( "%c", *tmp);//没考虑大小端 } } printInfo("\n"); break; case USB_DT_BOS: break; default: break; } printDesc = 0;#endif idx = ep->bEndpointAddress & 0x7f; if (idx > 4) { idx = 0; } fifo_reg = EP0_FIFO + 4 * idx; len = ((req->req.length - req->req.actual) < ep->ep.maxpacket) ? (req->req.length - req->req.actual) : ep->ep.maxpacket; buf = req->req.buf + req->req.actual; prefetch(buf);//prefetch将这一块数据读取到cache之中，以便后继快速访问，为了下面的writesb req->req.actual += len; writesb(fifo_reg + dev->virl_addr, buf, len); //req->req.actual已发送长度 //printInfo( " %dbytes ", req->req.actual); if (len != ep->ep.maxpacket) ret = 1; else if (req->req.length != req->req.actual || req->req.zero)//zero当要发送的长度小于请求长度是为1 ret = 0; else ret = 2; //printInfo( \ "Written ep%d %d.%d of %d b [last %d,z %d], max = %d\n", \ idx, len, req->req.actual, req->req.length, \ ret, req->req.zero,ep->ep.maxpacket); if (ret) { if (idx == 0) { if (!GETB(dev, USB_INT_REG, 2)) { EP0_SETIPR(dev); EP0_SETDE(dev); } ep->dev->ep0state = EP0_IDLE; } else { SETB(dev, IN_CSR1_REG, 0); }printInfo("write done\n"); s3c2440_udc_done(ep, req, 0); } else { if (idx == 0) { if (!GETB(dev, USB_INT_REG, 2)) { EP0_SETIPR(dev); } } else { SETB(dev, IN_CSR1_REG, 0); } } return ret;}static void s3c2440_dequeue_all(struct s3c2440_ep *ep, int status);static int s3c2440_udc_set_halt(struct usb_ep *_ep, int value);static void s3c2440_udc_handle_ep0_idle(struct s3c2440_udc *dev, struct s3c2440_ep *ep, u32 ep0_csr){ struct usb_ctrlrequest ctrlq; int tmp; bool config = 0; //printInfo( "%s\n", __func__); if (!(ep0_csr & 1))//判断数据是否接收完成 { return; } s3c2440_dequeue_all(ep, -EPROTO); if (s3c2440_read_ctrlq(dev, &ctrlq) < sizeof(struct usb_ctrlrequest)) { EP0_SETSST(dev); return; } //EP0_CLROPR是数据接收结束，EP0_SETDE是数据传输结束 switch (ctrlq.bRequest) { case USB_REQ_GET_STATUS: printInfo( "USB_REQ_GET_STATUS\n"); EP0_CLROPR(dev); if ((ctrlq.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {if (!s3c2440_get_status(dev, &ctrlq)) {return;} } break; case USB_REQ_CLEAR_FEATURE: printInfo( "USB_REQ_CLEAR_FEATURE\n"); EP0_CLROPR(dev);if (ctrlq.bRequestType != USB_RECIP_ENDPOINT)break;if (ctrlq.wValue != USB_ENDPOINT_HALT || ctrlq.wLength != 0)break;s3c2440_udc_set_halt(&dev->ep[ctrlq.wIndex & 0x7f].ep, 0); EP0_CLROPR(dev); EP0_SETDE(dev);return; case USB_REQ_SET_FEATURE: printInfo( "USB_REQ_SET_FEATURE\n"); EP0_CLROPR(dev);if (ctrlq.bRequestType != USB_RECIP_ENDPOINT)break;if (ctrlq.wValue != USB_ENDPOINT_HALT || ctrlq.wLength != 0)break;s3c2440_udc_set_halt(&dev->ep[ctrlq.wIndex & 0x7f].ep, 1); EP0_CLROPR(dev); EP0_SETDE(dev);return; case USB_REQ_SET_ADDRESS: printInfo( "USB_REQ_SET_ADDRESS\n"); if (ctrlq.bRequestType == USB_RECIP_DEVICE) { tmp = ctrlq.wValue & 0x7F; WRITE_REG(dev, FUNC_ADDR_REG, (1 << 7) | tmp); EP0_CLROPR(dev); EP0_SETDE(dev); dev->ep0state = EP0_IDLE; return; } break; case USB_REQ_GET_DESCRIPTOR: printInfo( "USB_REQ_GET_DESCRIPTOR\n"); switch (ctrlq.wValue >> 8) { case USB_DT_DEVICE: printInfo( "USB_DT_DEVICE\n"); break; //设备限定描述符用于指定另一传输速率下该设备的总体信息，如果高速 USB设备既需要采用高速传输又需 //要全速传输，则它必须支持设备限定描述符(Device_Qualifier)。全速设备不支持 case USB_DT_DEVICE_QUALIFIER: printInfo( "USB_DT_DEVICE_QUALIFIER\n"); break; case USB_DT_OTHER_SPEED_CONFIG: printInfo( "USB_DT_OTHER_SPEED_CONFIG\n"); break; case USB_DT_CONFIG: printInfo( "USB_DT_CONFIG\n"); break; case USB_DT_STRING: printInfo( "USB_DT_STRING\n"); break; //其他速率配置描述符用于指定另一传输速率下该设备的配置信息，如果高速USB设备既需要采用高速传输 //又需要全速传输，则它必须支持其他速率配置描述符 case USB_DT_BOS: printInfo( "USB_DT_BOS\n"); break; } EP0_CLROPR(dev); break; case USB_REQ_SET_DESCRIPTOR: printInfo( "USB_REQ_SET_DESCRIPTOR\n"); EP0_CLROPR(dev); break; case USB_REQ_GET_CONFIGURATION: printInfo( "USB_REQ_GET_CONFIGURATION\n"); EP0_CLROPR(dev); break; case USB_REQ_SET_CONFIGURATION: if (ctrlq.bRequestType == USB_RECIP_DEVICE) { printInfo( "USB_REQ_SET_CONFIGURATION\n"); config = 1; EP0_CLROPR(dev); EP0_SETDE(dev); } break; case USB_REQ_GET_INTERFACE: printInfo( "USB_REQ_GET_INTERFACE\n"); EP0_CLROPR(dev); break; case USB_REQ_SET_INTERFACE: if (ctrlq.bRequestType == USB_RECIP_INTERFACE) { printInfo( "SB_REQ_SET_INTERFACE\n"); config = 1; EP0_CLROPR(dev); EP0_SETDE(dev); } break; case USB_REQ_SYNCH_FRAME: printInfo( "USB_REQ_SYNCH_FRAME\n"); EP0_CLROPR(dev); break; } if (config != 1)//设置就一次传输就可以了 { if (ctrlq.bRequestType & USB_DIR_IN) dev->ep0state = EP0_IN; else dev->ep0state = EP0_OUT; } if (!dev->driver) return;#ifdef DEBUG //为了queue()中的调试打印设置标志 switch (ctrlq.bRequest) { case USB_REQ_GET_DESCRIPTOR: switch (ctrlq.wValue >> 8) { case USB_DT_DEVICE:printDesc = USB_DT_DEVICE; break; case USB_DT_DEVICE_QUALIFIER: printDesc = USB_DT_DEVICE_QUALIFIER; break; case USB_DT_OTHER_SPEED_CONFIG: printDesc = USB_DT_OTHER_SPEED_CONFIG; break; case USB_DT_CONFIG: printDesc = USB_DT_CONFIG; break; case USB_DT_STRING: printDesc = USB_DT_STRING; break; case USB_DT_BOS: break; } break; }#endif if (dev->driver->setup(&dev->gadget, &ctrlq) < 0) { if (config == 1)//配置错误，不要send stall，会重新选配置 { return; } EP0_SETSST(dev); EP0_SETDE(dev); dev->ep0state = EP0_IDLE; }}void s3c2440_handle_ep0(struct s3c2440_udc *dev){ struct s3c2440_ep *ep = &dev->ep[0]; struct s3c2440_request *req; u32 ep0_csr = 0; if (!list_empty(&ep->queue)) req = list_entry(ep->queue.next, struct s3c2440_request, queue); else req = NULL; WRITE_REG(dev, INDEX_REG, 0); ep0_csr = READ_REG(dev, EP0_CSR); if (ep0_csr & (1 << 5))//send_stall { s3c2440_dequeue_all(ep, -EPIPE);//调用complete函数 EP0_CLRSST(dev); dev->ep0state = EP0_IDLE; return; } if (ep0_csr & (1 << 4))//setup_end { s3c2440_dequeue_all(ep, 0); EP0_CLRSE(dev); dev->ep0state = EP0_IDLE; } switch (dev->ep0state) { case EP0_IDLE: s3c2440_udc_handle_ep0_idle(dev, ep, ep0_csr); break; case EP0_IN: if ((!(ep0_csr & (1 << 1))) && req) { s3c2440_write_fifo(dev, ep, req); } break; case EP0_OUT: if ((ep0_csr & 1) && req) { s3c2440_read_fifo(dev, ep, req); } break; case EP0_STALL: dev->ep0state = EP0_IDLE; break; }}void s3c2440_handle_ep(struct s3c2440_udc *dev, u8 n){ struct s3c2440_ep *ep = &dev->ep[n]; struct s3c2440_request *req;u32 ep_csr1; if (!list_empty(&ep->queue)) req = list_entry(ep->queue.next, struct s3c2440_request, queue); else req = NULL; WRITE_REG(dev, INDEX_REG, n);if (ep->bEndpointAddress & USB_DIR_IN){ep_csr1 = READ_REG(dev, IN_CSR1_REG); if (ep_csr1 & (1 << 5))//SENT_STALL{CLRB(dev, IN_CSR1_REG, 5);return;}if ((!(ep_csr1 & 1)) && req){s3c2440_write_fifo(dev, ep, req);}}else{ ep_csr1 = READ_REG(dev, OUT_CSR1_REG);if (ep_csr1 & (1 << 6)) //SENT_STALL{CLRB(dev, OUT_CSR1_REG, 6);return;}if ((ep_csr1 & 1) && req){s3c2440_read_fifo(dev, ep, req);}}}//udc的这个中断，真是包罗万象，各硬件差别比较大//简单一点说，就是清楚中断标致位，再根据中断标志位对应处理//实际要复杂的多，如果是ep0，还会从fifo中取得usb_ctrlrequest//进行对应的处理，我们在实现具体的实现时再说吧static irqreturn_t s3c2440_udc_irq(int dummy, void *_dev){ struct s3c2440_udc *dev = (struct s3c2440_udc *)_dev; unsigned long flags; int usb_status; int ep_status;int pwr_reg;int ep0csr; u8 n; //printInfo( "enter irq\n"); spin_lock_irqsave(&dev->lock, flags); usb_status = READ_REG(dev, USB_INT_REG); ep_status = READ_REG(dev, EP_INT_REG); //printInfo( "USB_INT_REG = 0x%x\n", usb_status); //printInfo( "EP_INT_REG = 0x%x\n", ep_status); /* Driver connected ? */ if (!dev->driver) { /* Clear interrupts */ WRITE_REG(dev, USB_INT_REG, READ_REG(dev, USB_INT_REG)); WRITE_REG(dev, EP_INT_REG, READ_REG(dev, EP_INT_REG)); } //reset if (usb_status & (1 << 2)) { printInfo( "USB reset\n"); WRITE_REG(dev, INDEX_REG, 0); WRITE_REG(dev, MAXP_REG, (dev->ep[0].ep.maxpacket & 0x7ff) >> 3); dev->ep0state = EP0_IDLE; dev->gadget.speed = USB_SPEED_FULL; s3c2440_dequeue_all(&dev->ep[0], -EPROTO); SETB(dev, USB_INT_REG, 2); spin_unlock_irqrestore(&dev->lock, flags); return IRQ_HANDLED; } //resume if (usb_status & (1 << 1)) { printInfo( "USB resume\n"); SETB(dev, USB_INT_REG, 1); if (dev->gadget.speed != USB_SPEED_UNKNOWN && dev->driver && dev->driver->resume) dev->driver->resume(&dev->gadget); } //suspend if (usb_status & 1) { printInfo( "USB suspend\n"); SETB(dev, USB_INT_REG, 0); if (dev->gadget.speed != USB_SPEED_UNKNOWN && dev->driver && dev->driver->suspend) dev->driver->suspend(&dev->gadget); dev->ep0state = EP0_IDLE; } if (ep_status & 1) { //printInfo( "USB ep0 irq\n");SETB(dev, EP_INT_REG, 0); s3c2440_handle_ep0(dev); }for (n = 1; n < S3C2440_ENDPOINTS; n++){if (ep_status & (1 << n)){//printInfo( "USB ep%d irq\n", n);SETB(dev, EP_INT_REG, n);//清除中断s3c2440_handle_ep(dev, n);}}pwr_reg = READ_REG(dev, PWR_REG);WRITE_REG(dev, INDEX_REG, 0);ep0csr = READ_REG(dev, EP0_CSR);if (!usb_status && !ep_status && !pwr_reg && !ep0csr) {for (n = 1; n < S3C2440_ENDPOINTS; n++) {WRITE_REG(dev, INDEX_REG, n);if (GETB(dev, OUT_CSR1_REG, 0)){s3c2440_handle_ep(dev, n);}}} spin_unlock_irqrestore(&dev->lock, flags); return IRQ_HANDLED;}/***************************************************************//***********************queue***********************************///对于usb请求，一般都要维护一个list去管理请求//端点list初始化，存入gadget里static void s3c2440_usb_reinit(struct s3c2440_udc *dev){ u8 i; /* device/ep0 records init */ INIT_LIST_HEAD (&dev->gadget.ep_list); dev->gadget.ep0 = &dev->ep[0].ep;//ep0单独存放 dev->ep0state = EP0_IDLE; INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); for (i = 0; i < S3C2440_ENDPOINTS; i++) { struct s3c2440_ep *ep = &dev->ep[i]; if (i != 0) list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list); ep->dev = dev; ep->desc = NULL; ep->stopped = 0; INIT_LIST_HEAD (&ep->queue); }}static void s3c2440_udc_done(struct s3c2440_ep *ep, struct s3c2440_request *req, int status){ struct s3c2440_udc *dev; unsigned stopped = ep->stopped; list_del_init(&req->queue); if (likely (req->req.status == -EINPROGRESS))//正在进行中 req->req.status = status; else status = req->req.status; dev = ep->dev; /* don't modify queue heads during completion callback */ ep->stopped = 1; //先解锁再加锁，加锁是在dequeue_all调用前做的 spin_unlock(&dev->lock); req->req.complete(&ep->ep, &req->req); spin_lock(&dev->lock); ep->stopped = stopped;}static void s3c2440_dequeue_all(struct s3c2440_ep *ep, int status){ struct s3c2440_request *req; if (&ep->queue == NULL) return; while (!list_empty(&ep->queue)) //list_del_init会删除链表中的元素 { req = list_entry(ep->queue.next, struct s3c2440_request, queue); s3c2440_udc_done(ep, req, status); }}/***************************************************************///may not be the endpoint named "ep0".这是gadget.h的源话/**************************ep_ops*******************************///描述端点操作//当设备配置或接口设置改变时，驱动会enable或disable端口static int s3c2440_udc_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc){ struct s3c2440_udc *dev; struct s3c2440_ep *ep; u32 max; unsigned long flags; printInfo( "%s\n", __func__); ep = to_s3c2440_ep(_ep); if (!_ep || !desc || ep->desc || (desc->bDescriptorType != USB_DT_ENDPOINT) || (_ep->name == ep0name)) return -EINVAL; dev = ep->dev; if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; max = usb_endpoint_maxp(desc) & 0x1fff; spin_lock_irqsave(&dev->lock, flags); _ep->maxpacket = max & 0x7fff; ep->desc = desc; ep->stopped = 0;#ifdef S3C2440_SETWEDHE ep->wedged = 0;#endif ep->bEndpointAddress = desc->bEndpointAddress; WRITE_REG(dev, INDEX_REG, ep->num); WRITE_REG(dev, MAXP_REG, max >> 3); if (desc->bEndpointAddress & USB_DIR_IN) { //SETB(dev, IN_CSR1_REG, 0);//清楚IN_PKT_RDY SETB(dev, IN_CSR1_REG, 3);//FLUSH fifoSETB(dev, IN_CSR1_REG, 6);//CLR DATA SETB(dev, IN_CSR2_REG, 4);//关闭in dma中断，先不用dma//CLRB(dev, IN_CSR2_REG, 4);//打开in dma中断 SETB(dev, IN_CSR2_REG, 5);//in CLRB(dev, IN_CSR2_REG, 6);//批量端点 } else {SETB(dev, IN_CSR1_REG, 6);//CLR DATASETB(dev, IN_CSR2_REG, 4);//关闭in dma中断，先不用dma CLRB(dev, IN_CSR2_REG, 5);//out //SETB(dev, OUT_CSR1_REG, 0);//清楚IN_PKT_RDYSETB(dev, OUT_CSR1_REG, 7); SETB(dev, OUT_CSR1_REG, 4);//FLUSH fifo CLRB(dev, OUT_CSR2_REG, 6);//批量端点 SETB(dev, OUT_CSR2_REG, 5);//关闭out dma中断，先不用dma//CLRB(dev, OUT_CSR2_REG, 5);//打开out dma中断 } SETB(dev, EP_INT_EN_REG, ep->num);//开中断 spin_unlock_irqrestore(&dev->lock, flags); return 0;}static int s3c2440_udc_ep_disable(struct usb_ep *_ep){ struct s3c2440_udc *dev; struct s3c2440_ep *ep = to_s3c2440_ep(_ep); unsigned long flags; printInfo( "%s\n", __func__); if (!_ep || !ep->desc) { return -EINVAL; } local_irq_save(flags); ep->desc = NULL; ep->stopped = 1; dev = ep->dev; //清除请求list和关闭ep s3c2440_dequeue_all(ep, -ESHUTDOWN);//关机后将无法传输端点 CLRB(dev, EP_INT_REG, ep->num);//关对应ep中断 local_irq_restore(flags); return 0;}//动态分配请求static struct usb_request *s3c2440_udc_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags){ struct s3c2440_request *req; printInfo( "%s\n", __func__); if (!_ep) return NULL; req = kzalloc (sizeof(struct s3c2440_request), gfp_flags); if (!req) return NULL; INIT_LIST_HEAD (&req->queue); return &req->req;}//释放请求static void s3c2440_udc_free_request(struct usb_ep *_ep, struct usb_request *_req){ //struct s3c2440_ep *ep = to_s3c2440_ep(_ep); struct s3c2440_request *req = to_s3c2440_req(_req); printInfo( "%s\n", __func__); if (!_ep || !_req) return; WARN_ON (!list_empty (&req->queue)); kfree(req);req = NULL;}//下面的queue是插入一个请求//dequeue删除一个请求static int s3c2440_udc_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags){ struct s3c2440_udc *dev; unsigned long flags; struct s3c2440_request *req = to_s3c2440_req(_req); struct s3c2440_ep *ep = to_s3c2440_ep(_ep); u32 ep_csr; printInfo( "%s\n", __func__); if (unlikely (!_ep || (!ep->desc && ep->num != 0))) //这个逻辑下面会看到很多（_ep为空或[ep->desc为空且不是0端点]） { return -EINVAL; } dev = ep->dev; if (unlikely (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) { return -ESHUTDOWN; } local_irq_save (flags); //因为中断中有queue操作，所以要放在list_empty前 if (unlikely(!_req || !_req->complete || !_req->buf || !list_empty(&req->queue))) //_req或_req->buf为空、complete执行错误、req->queue不为空 { local_irq_restore(flags); return -EINVAL; } _req->status = -EINPROGRESS; _req->actual = 0; WRITE_REG(dev, INDEX_REG, ep->bEndpointAddress & 0x7F); //s3c2440_usb_fifocnt(dev, &fifo_count); if ((ep->bEndpointAddress & 0x7F) == 0) { ep_csr = READ_REG(dev, EP0_CSR); } else {if (ep->bEndpointAddress & USB_DIR_IN){ ep_csr = READ_REG(dev, IN_CSR1_REG);}else{ep_csr = READ_REG(dev, OUT_CSR1_REG);}//(ep->bEndpointAddress & USB_DIR_IN) ? IN_CSR1_REG : OUT_CSR1_REG); } if (list_empty(&ep->queue) && !ep->stopped) { if (ep->bEndpointAddress == 0) { switch(dev->ep0state) { case EP0_IN: if (!(ep_csr & (1 << 1))) { if (s3c2440_write_fifo(dev, ep, req)) { dev->ep0state = EP0_IDLE; req = NULL; } } break; case EP0_OUT: if (ep_csr & 1) { if (s3c2440_read_fifo(dev, ep, req)) { dev->ep0state = EP0_IDLE; req = NULL; } } break; default: local_irq_restore(flags); return -EL2HLT; } } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) { if ((!(ep_csr & 1)) && req) { if (s3c2440_write_fifo(dev, ep, req)){req = NULL;} } } else { if ((ep_csr & 1) && req) { if (s3c2440_read_fifo(dev, ep, req)){req = NULL;} } } } if (likely(req != 0)) list_add_tail(&req->queue, &ep->queue);//请求入list local_irq_restore(flags); return 0;}static int s3c2440_udc_dequeue(struct usb_ep *_ep, struct usb_request *_req){ struct s3c2440_ep *ep = to_s3c2440_ep(_ep); struct s3c2440_udc *dev; int retval = -EINVAL; unsigned long flags; struct s3c2440_request *req = NULL; printInfo( "%s\n", __func__); if (!_ep || !_req) return retval; dev = ep->dev; if (!dev->driver) return -ESHUTDOWN; local_irq_save (flags); list_for_each_entry (req, &ep->queue, queue) { if (&req->req == _req) { list_del_init (&req->queue); _req->status = -ECONNRESET;//Connection reset by peer retval = 0; break; } } if (retval == 0) { s3c2440_udc_done(ep, req, -ECONNRESET); } local_irq_restore (flags); return retval;}#ifdef S3C2440_FIFO_STATUS//fifo状态，返回fifo中的字节数。//在上层的调用usb_ep_fifo_statu()如果不用fifo或不支持这个操作返回错误-EOPNOTSUPP//net2272就有寄存器EP_AVAIL记录fifo中的字节数。//s3c2440硬件不支持，没实现，上层调用会得到-EOPNOTSUPPstatic int s3c2440_udc_fifo_status(struct usb_ep *_ep){ struct s3c2440_ep *ep; u16 retval = 0; printInfo( "%s\n", __func__); ep = to_s3c2440_ep(_ep); if (!_ep || (!ep->desc && ep->num != 0)) return -ENODEV; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; //retval = 读寄存器 return retval;}#endif#ifdef S3C2440_FIFO_FLUSH//冲掉fifo的不明确数据，这个决不用除非端点不能用于任何协议传输，这是上层调用的事static void s3c2440_udc_fifo_flush(struct usb_ep *_ep){ struct s3c2440_ep *ep; printInfo( "%s\n", __func__); ep = to_s3c2440_ep(_ep); if (!_ep || (!ep->desc && ep->num != 0)) return; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return; //寄存器操作}#endif/*上层调用usb_ep_set_wedge停止一个端点并忽略CLEAR_FEATURE请求。如果Gadget驱动清除停止状态，它将自动Unwedge端点一般用一个位wedge表示如果没有实现set_wedge方法。就用set_halt(ep, 1);代替我们看个例子（在file_storage.c中）Bulk-only当出现无效的CBW时Bulk-only Spec说我们必须停止IN 端点。还说必须保持这个状态知道下一次的reset，但是没有办法告诉控制器忽略CLEAR_FEATURE请求。所以我们用一个位来记录，搞定！下面是参考net2272的代码，value=1:set_halt= 0:clear_halt*/static int s3c2440_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged){ struct s3c2440_ep *ep; unsigned long flags; int ret = 0; struct s3c2440_udc *dev; ep = container_of(_ep, struct s3c2440_ep, ep); if (!_ep || (!ep->desc && ep->num != 0)) return -EINVAL; if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) return -ESHUTDOWN; if (ep->desc /* not ep0 */ && usb_endpoint_xfer_isoc(ep->desc))//判断是不是同步端点，见下面 return -EINVAL; dev = ep->dev; spin_lock_irqsave(&ep->dev->lock, flags); if (!list_empty(&ep->queue)) ret = -EAGAIN;#ifdef S3C2440_FIFO_STATUS else if ((ep->bEndpointAddress & USB_DIR_IN) && value && s3c2440_udc_fifo_status(_ep) != 0)//fifo_status是上面实现的 ret = -EAGAIN;#endif else {WRITE_REG(dev, INDEX_REG, ep->num); /* set/clear */ if (value) { if (ep->num == 0) { ep->dev->ep0state = EP0_STALL; //net2272的端点0在setup时自动复位，没有什么操作。s3c2440就不是了 //ep->dev->protocol_stall = 1; //ep0 set_halt EP0_SETSST(dev); } else{ //epx(x != 0) set_haltif ((ep->bEndpointAddress & USB_DIR_IN) != 0){SETB(dev, IN_CSR1_REG, 4);}else{ SETB(dev, OUT_CSR1_REG, 5);}} if (wedged)//维护wedged ep->wedged = 1; } else {if (ep->num == 0) { ep->dev->ep0state = EP0_IDLE; EP0_CLRSST(dev); } else{ //epx(x != 0) set_haltif ((ep->bEndpointAddress & USB_DIR_IN) != 0){CLRB(dev, IN_CSR1_REG, 4);}else{CLRB(dev, OUT_CSR1_REG, 5);}} //ep clear_halt ep->wedged = 0; } }ep->stopped = value ? 1 : 0; spin_unlock_irqrestore(&ep->dev->lock, flags); return ret;}//_ep 不能是同步端点，同步端点不支持错误重发机制。在上面判断static int s3c2440_udc_set_halt(struct usb_ep *_ep, int value){ printInfo( "%s\n", __func__); return s3c2440_set_halt_and_wedge(_ep, value, 0);}#ifdef S3C2440_SETWEDHEstatic int s3c2440_udc_set_wedge(struct usb_ep *_ep){ printInfo( "%s\n", __func__); if (!_ep || _ep->name == ep0name)//一般都是端点0请求复位 return -EINVAL; return s3c2440_set_halt_and_wedge(_ep, 1, 1);}#endifstatic const struct usb_ep_ops s3c2440_ep_ops = { .enable = s3c2440_udc_ep_enable, .disable = s3c2440_udc_ep_disable, .alloc_request = s3c2440_udc_alloc_request, .free_request = s3c2440_udc_free_request, .queue = s3c2440_udc_queue, .dequeue = s3c2440_udc_dequeue, .set_halt = s3c2440_udc_set_halt,#ifdef S3C2440_SETWEDHE .set_wedge = s3c2440_udc_set_wedge,#endif#ifdef S3C2440_FIFO_STATUS .fifo_status = s3c2440_udc_fifo_status,#endif#ifdef S3C2440_FIFO_FLUSH .fifo_flush = s3c2440_udc_fifo_flush,#endif};/***************************************************************///USB 设备的常用操作包括：设备连接、设备移除、设备配置、地址分配、数据传输、 //设备挂起、设备唤醒等。/**************************usb_gadget_ops***********************///硬件操作函数//获取帧号，当主机发送USB 数据包时，每个帧的开始（SOF）包包含一个帧号。//这个帧号一般自动加载到对应寄存器，此函数主要就是读这些寄存器//如果设备不支持返回负static int s3c2440_udc_get_frame(struct usb_gadget *usb_gdt_p){ printInfo( "%s\n", __func__);#ifdef S3C2440_GET_FRAME struct s3c2440_udc *dev = to_s3c2440_udc(usb_gdt_p); int retval = 0; unsigned long flags; spin_lock_irqsave(&dev->lock, flags); retval = READ_REG(dev, S3C2410_UDC_FRAME_NUM2_REG) << 8; retval |= READ_REG(dev, S3C2410_UDC_FRAME_NUM1_REG); spin_unlock_irqrestore(&dev->lock, flags); return retval;#else return -EOPNOTSUPP;#endif}#ifdef S3C2440_WAKEUP//唤醒，举个例子net2272。它的寄存器usbctl0的第五位控制唤醒功能使能//寄存器usbctl1的第三位通过写1去resume，s3c2440在PWR_REG也有类似static int s3c2440_udc_wakeup(struct usb_gadget *usb_gdt_p){ struct s3c2440_udc *dev = to_s3c2440_udc(usb_gdt_p); unsigned long flags; printInfo( "%s\n", __func__); spin_lock_irqsave(&dev->lock, flags); if (GETB(dev, PWR_REG, 0))//如果使能挂起模式 { SETB(dev, PWR_REG, 2); } spin_unlock_irqrestore(&dev->lock, flags); return 0;}#endif#ifdef S3C2440_SELFPOWERED//设置自供电标志(selfpowered feature)，一般就用一个变量位或一个位记录一下。USB_RECIP_DEVICE时返回状态static int s3c2440_udc_set_selfpowered (struct usb_gadget *usb_gdt_p, int is_selfpowered){ struct s3c2440_udc *dev = to_s3c2440_udc(usb_gdt_p); printInfo( "%s\n", __func__); if (is_selfpowered) dev->devstatus |= (1 << USB_DEVICE_SELF_POWERED); else dev->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); return 0;}#endif#ifdef S3C2440_VBUS_SESSION//vbus在硬件上就是usb的电源脚，这个函数就是来控制它。一般通过一个gpio拉高拉底//这个vbus会话，实际的我看了s3c2410和at91的处理，就是让usb的D+线与一个gpio口连接//通过置1置0来控制usbstatic int s3c2440_udc_vbus_session (struct usb_gadget *usb_gdt_p, int is_active){ struct s3c2440_udc *dev = to_s3c2440_udc(usb_gdt_p); unsigned long flags; printInfo( "%s\n", __func__); spin_lock_irqsave(&dev->lock, flags); //寄存器操作 spin_unlock_irqrestore(&dev->lock, flags); return 0;}#endif#ifdef S3C2440_VBBUS_DRAW//强制vbus电源控制器行为，在SET_CONFIGRATION时，设置vbus的电流量//vbus应该是表示总线电压，在硬件上是一个脚//主要是对usb电流的设置，看一下gta02平台，这个函数会操作pcf50633(一种移动设备的电源管理芯片）static int s3c2440_udc_vbus_draw (struct usb_gadget *usb_gdt_p, unsigned mA){ return 0;}#endif#ifdef S3C2440X_PULLUP//这个和上面的vbus_session区别是//vbus_session是控制vbus的连接//pullup是控制usb模块的连接//在udc-core.c中newstyle的驱动probe函数时才调用它，所以你要实现udc_start和udc_stop，//当然除了注册，也可以通过sysfs调用它。和newstyle无关。//composite.c也有一些调用//这个就是根据is_on来connect或disconnect usb//net2272就是由USBCTL0的第三位控制的，s3c2440还是通过gpio和vbus_session没//区别static int s3c2440_udc_pullup (struct usb_gadget *usb_gdt_p, int is_on){ struct s3c2440_udc *dev = to_s3c2440_udc(usb_gdt_p); unsigned long flags; printInfo( "%s\n", __func__); spin_lock_irqsave(&dev->lock, flags); if (is_on) { PULL_UP(); } else { PULL_DOWN(); } spin_unlock_irqrestore(&dev->lock, flags); return 0;}#endif//不好意思，我看了linux-3.2.36的/gadget的目录没发现有实现这个的硬件static int s3c2440_udc_ioctl(struct usb_gadget *usb_gdt_p, unsigned code, unsigned long param){ return 0;}//这个也没看驱动实现它，从名字就是获取配置参数，就简单看看struct usb_dcd_config_params/*struct usb_dcd_config_params { __u8 bU1devExitLat; // U1 Device exit Latency u1设备等待时间#define USB_DEFAULT_U1_DEV_EXIT_LAT 0x01 // Less then 1 microsec 至少1微秒 __le16 bU2DevExitLat; // U2 Device exit Latency #define USB_DEFAULT_U2_DEV_EXIT_LAT 0x1F4 // Less then 500 microsec };对应struct usb_ss_cap_descriptor 中的成员每一个I/O请求包延迟时间限制*/static void s3c2440_udc_get_config_params(struct usb_dcd_config_params *usb_dc_cfg_pm){}//在udc-core.c中start和udc_start的解释一样，在bind()之前调用，只要实现一个就行了//我知道start主要有bind回调//udc_start主要是设备执行了non-control请求后，要重新连接，net2272和r8a66597实现的就是它#ifdef S3C2440_NEWSTYLEstatic int s3c2440_udc_start(struct usb_gadget *usb_gdt_p, struct usb_gadget_driver *driver);static int s3c2440_udc_stop(struct usb_gadget *usb_gdt_p, struct usb_gadget_driver *driver);#else//s3c2410 s3c2440 实现它static int s3c2440_start(struct usb_gadget_driver *driver, int (*bind)(struct usb_gadget *));static int s3c2440_stop(struct usb_gadget_driver *driver);#endifstatic const struct usb_gadget_ops s3c2440_ops = { .get_frame = s3c2440_udc_get_frame,#ifdef S3C2440_WAKEUP .wakeup = s3c2440_udc_wakeup,#endif#ifdef S3C2440_SELFPOWERED .set_selfpowered = s3c2440_udc_set_selfpowered,#endif#ifdef S3C2440_VBUS_SESSION .vbus_session = s3c2440_udc_vbus_session,#endif#ifdef S3C2440_VBBUS_DRAW .vbus_draw = s3c2440_udc_vbus_draw,#endif#ifdef S3C2440X_PULLUP .pullup = s3c2440_udc_pullup,#endif .ioctl = s3c2440_udc_ioctl, .get_config_params = s3c2440_udc_get_config_params,#ifdef S3C2440_NEWSTYLE .udc_start = s3c2440_udc_start, .udc_stop = s3c2440_udc_stop,#else .start = s3c2440_start, .stop = s3c2440_stop,#endif};/***************************************************************//***************************************************************/static struct s3c2440_udc udc_info = { .gadget = { .ops = &s3c2440_ops, .ep0 = &udc_info.ep[0].ep, .name = gadget_name, .dev = { .init_name = "gadget", },/*根据自己的硬件选择unsigned is_dualspeed:1;unsigned is_otg:1;unsigned is_a_peripheral:1;unsigned b_hnp_enable:1; //hnp:主机协商协议 otg特有的unsigned a_hnp_support:1;unsigned a_alt_hnp_support:1;*/ }, /* control endpoint */ .ep[0] = { .num = 0, .ep = { .name = "ep0", .ops = &s3c2440_ep_ops, .maxpacket = EP0_FIFO_SIZE, }, .dev = &udc_info, .fifo_size = S3C2440_EP0_FIFO_SIZE, }, /* first group of endpoints */ .ep[1] = { .num = 1, .ep = { .name = "ep1-bulk", .ops = &s3c2440_ep_ops, .maxpacket = EP1_FIFO_SIZE, }, .dev = &udc_info, .fifo_size = S3C2440_EP1_FIFO_SIZE, .bEndpointAddress = EP1_ADDRESS, .bmAttributes = EP1_ATTR, }, .ep[2] = { .num = 2, .ep = { .name = "ep2-bulk", .ops = &s3c2440_ep_ops, .maxpacket = EP2_FIFO_SIZE, }, .dev = &udc_info, .fifo_size = S3C2440_EP2_FIFO_SIZE, .bEndpointAddress = EP2_ADDRESS, .bmAttributes = EP2_ATTR, }, .ep[3] = { .num = 3, .ep = { .name = "ep3-bulk", .ops = &s3c2440_ep_ops, .maxpacket = EP3_FIFO_SIZE, }, .dev = &udc_info, .fifo_size = S3C2440_EP3_FIFO_SIZE, .bEndpointAddress = EP3_ADDRESS, .bmAttributes = EP3_ATTR, }, .ep[4] = { .num = 4, .ep = { .name = "ep4-bulk", .ops = &s3c2440_ep_ops, .maxpacket = EP4_FIFO_SIZE, }, .dev = &udc_info, .fifo_size = S3C2440_EP4_FIFO_SIZE, .bEndpointAddress = EP4_ADDRESS, .bmAttributes = EP4_ATTR, },};static void stop_activity(struct s3c2440_udc *dev, struct usb_gadget_driver *driver){ unsigned i; if (dev->gadget.speed == USB_SPEED_UNKNOWN) driver = NULL; /* disconnect gadget driver after quiesceing hw and the driver */ s3c2440_usb_reset(dev);//复位或disable for (i = 0; i < S3C2440_ENDPOINTS; i++) { s3c2440_dequeue_all(&dev->ep[i], -ECONNABORTED); }#ifndef S3C2440_NEWSTYLE/*if (udc_is_newstyle(udc)) { udc->driver->disconnect(udc->gadget); udc->driver->unbind(udc->gadget); usb_gadget_udc_stop(udc->gadget, udc->driver); usb_gadget_disconnect(udc->gadget);//对应pull_up} else { usb_gadget_stop(udc->gadget, udc->driver);//所以非newstyle要disconnect}*/ if (driver) { spin_unlock(&dev->lock); driver->disconnect(&dev->gadget); spin_lock(&dev->lock); }#endif if (dev->driver) { s3c2440_usb_reinit(dev);//重初始化 }}#ifdef S3C2440_NEWSTYLE/*udc 的probe函数if (udc_is_newstyle(udc)) {//是否实现udc_start and udc_stop ret = bind(udc->gadget); if (ret) goto err1; ret = usb_gadget_udc_start(udc->gadget, driver);//已绑定,bind是gadget实现的 if (ret) { driver->unbind(udc->gadget); goto err1; } usb_gadget_connect(udc->gadget);//上面的pullup} else { ret = usb_gadget_start(udc->gadget, driver, bind); if (ret) goto err1;}*///net2272和r8a66597实现的就是它//下面参考net2272static int s3c2440_udc_start(struct usb_gadget *usb_gdt_p, struct usb_gadget_driver *driver){ struct s3c2440_udc *dev; printInfo( "%s\n", __func__); if (!driver || !driver->unbind || !driver->setup || driver->speed != USB_SPEED_HIGH) return -EINVAL; dev = container_of(usb_gdt_p, struct s3c2440_udc, gadget); /* hook up the driver ... */ driver->driver.bus = NULL; dev->driver = driver; dev->gadget.dev.driver = &driver->driver; s3c2440_udc_enable(dev); return 0;}static int s3c2440_udc_stop(struct usb_gadget *usb_gdt_p, struct usb_gadget_driver *driver){ struct s3c2440_udc *dev; unsigned long flags; printInfo( "%s\n", __func__); dev = container_of(usb_gdt_p, struct s3c2440_udc, gadget); spin_lock_irqsave(&dev->lock, flags); stop_activity(dev, driver); spin_unlock_irqrestore(&dev->lock, flags); dev->gadget.dev.driver = NULL; dev->driver = NULL; return 0;}#else//s3c2410 s3c2440 实现它//下面参考s3c2440static int s3c2440_start(struct usb_gadget_driver *driver, int (*bind)(struct usb_gadget *usb_gdt_p)){ struct s3c2440_udc *dev = &udc_info; int retval = 0; printInfo( "%s\n", __func__); if (!driver || driver->speed < USB_SPEED_FULL || !bind || !driver->disconnect || !driver->setup) return -EINVAL; if (!dev) return -ENODEV; if (dev->driver) return -EBUSY; /* hook up the driver */ driver->driver.bus = NULL; dev->driver = driver; dev->gadget.dev.driver = &driver->driver; if ((retval = device_add(&dev->gadget.dev)) != 0) { goto register_error; } retval = bind(&dev->gadget); if (retval) { device_del(&dev->gadget.dev); goto register_error; } s3c2440_udc_enable(dev); return 0;register_error: dev->driver = NULL; dev->gadget.dev.driver = NULL; return retval;}static int s3c2440_stop(struct usb_gadget_driver *driver){ struct s3c2440_udc *dev = &udc_info; unsigned long flags; printInfo( "%s\n", __func__); if (!dev) return -ENODEV; if (!driver || driver != dev->driver || !driver->unbind) return -EINVAL; spin_lock_irqsave(&dev->lock, flags); dev->driver = NULL; stop_activity(dev, driver); spin_unlock_irqrestore(&dev->lock, flags); driver->unbind(&dev->gadget); dev->gadget.dev.driver = NULL; dev->driver = NULL; device_del(&dev->gadget.dev); return 0;}#endif/***************************************************************/static int s3c2440_udc_probe(struct platform_device *pdev){ struct s3c2440_udc *udc = &udc_info; struct device *dev = &pdev->dev; int retval; struct resource *res;#ifdef S3C2440_USE_IRQ struct resource *resirq;#endif resource_size_t res_size; dev_dbg(dev, "%s()\n", __func__);#ifdef S3C2440_HAVE_CLK udc->s3c2440_clk_upll = clk_get(NULL, "usb-bus-gadget"); if (IS_ERR(udc->s3c2440_clk_upll)) { dev_err(dev, "failed to get usb bus clock source\n"); return PTR_ERR(udc->s3c2440_clk_upll); } clk_enable(udc->s3c2440_clk_upll); udc->s3c2440_clk_udc = clk_get(NULL, "usb-device"); if (IS_ERR(udc->s3c2440_clk_udc)) { dev_err(dev, "failed to get udc clock source\n"); retval = PTR_ERR(udc->s3c2440_clk_udc); goto err_clk_upll; } clk_enable(udc->s3c2440_clk_udc);#if (CLK_DELAY_TIME != 0) mdelay(CLK_DELAY_TIME);#endif dev_dbg(dev, "got and enabled clocks\n");#endif //S3C2440_HAVE_CLK spin_lock_init (&udc->lock); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "can't get device resources\n"); retval = -ENODEV; goto err_clk_udc; } res_size = resource_size(res); if (!request_mem_region(res->start, res_size, res->name)) { dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n", res_size, res->start); retval = -ENOMEM; goto err_clk_udc; } udc->virl_addr = ioremap(res->start, res_size); if (!udc->virl_addr) { retval = -ENOMEM; goto err_mem; } udc->phy_addr = res->start; udc->reg_size = res_size; device_initialize(&udc->gadget.dev); udc->gadget.dev.parent = &pdev->dev; udc->gadget.dev.dma_mask = pdev->dev.dma_mask; platform_set_drvdata(pdev, udc); //少不了硬件初始化 s3c2440_usb_reset(udc); s3c2440_usb_reinit(udc);#ifdef S3C2440_USE_IRQ resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (!resirq) { dev_err(&pdev->dev, "can't get device irq resources\n"); retval = -ENODEV; goto err_map; } udc->irq_num = resirq->start; retval = request_irq(udc->irq_num, s3c2440_udc_irq, 0, gadget_name, (void*)udc); if (retval != 0) { dev_err(dev, "cannot get irq %i, err %d\n", udc->irq_num, retval); retval = -EBUSY; goto err_map; } dev_dbg(dev, "got irq %i\n", udc->irq_num);#endif retval = usb_add_gadget_udc(&pdev->dev, &udc->gadget); if (retval) goto err_int;#ifdef S3C2440_DEBUG_FS if (s3c2440_udc_debugfs_root) { udc->debug_info = debugfs_create_file("registers", S_IRUGO, s3c2440_udc_debugfs_root, udc, &s3c2440_udc_debugfs_fops); if (!udc->debug_info) dev_warn(dev, "debugfs file creation failed\n"); }#endif dev_dbg(dev, "probe ok\n"); return 0;err_int:#ifdef S3C2440_USE_IRQ free_irq(udc->irq_num, udc);#endiferr_map: iounmap(udc->virl_addr);err_mem: release_mem_region(res->start, res_size);err_clk_udc:#ifdef S3C2440_HAVE_CLK clk_put(udc->s3c2440_clk_udc); clk_disable(udc->s3c2440_clk_udc);#endiferr_clk_upll:#ifdef S3C2440_HAVE_CLK clk_put(udc->s3c2440_clk_upll); clk_disable(udc->s3c2440_clk_upll);#endif return retval;}static int s3c2440_udc_remove(struct platform_device *pdev){ struct s3c2440_udc *udc = platform_get_drvdata(pdev); dev_dbg(&pdev->dev, "%s()\n", __func__); usb_del_gadget_udc(&udc->gadget); if (udc->driver) return -EBUSY;#ifdef S3C2440_DEBUG_FS debugfs_remove(udc->debug_info);#endif#ifdef S3C2440_USE_IRQ free_irq(udc->irq_num, udc);#endif iounmap(udc->virl_addr); release_mem_region(udc->phy_addr, udc->reg_size); platform_set_drvdata(pdev, NULL);#ifdef S3C2440_HAVE_CLK if (!IS_ERR(udc->s3c2440_clk_udc) && udc->s3c2440_clk_udc != NULL) { clk_disable(udc->s3c2440_clk_udc); clk_put(udc->s3c2440_clk_udc); udc->s3c2440_clk_udc = NULL; } if (!IS_ERR(udc->s3c2440_clk_upll) && udc->s3c2440_clk_upll != NULL) { clk_disable(udc->s3c2440_clk_upll); clk_put(udc->s3c2440_clk_upll); udc->s3c2440_clk_upll = NULL; }#endif dev_dbg(&pdev->dev, "%s: remove ok\n", __func__); return 0;}#ifdef CONFIG_PMstatic int s3c2440_udc_suspend(struct platform_device *pdev, pm_message_t message){ return 0;}static int s3c2440_udc_resume(struct platform_device *pdev){ return 0;}#else#define s3c2440_udc_suspend NULL#define s3c2440_udc_resume NULL#endif/***************************************************************///有些设备可能用struct pci_driver，我就不考虑这么多了。static struct platform_driver udc_driver_s3c2440 = { .driver = { .name = "s3c2440-usbgadget", .owner = THIS_MODULE, }, .probe = s3c2440_udc_probe, .remove = __exit_p(s3c2440_udc_remove), .suspend = s3c2440_udc_suspend, .resume = s3c2440_udc_resume,};static int __init udc_init(void){ int retval; s3c2440_udc_debugfs_root = debugfs_create_dir(gadget_name, NULL); if (IS_ERR(s3c2440_udc_debugfs_root)) { printInfo( "%s: debugfs dir creation failed %ld\n", gadget_name, PTR_ERR(s3c2440_udc_debugfs_root)); s3c2440_udc_debugfs_root = NULL; } retval = platform_driver_register(&udc_driver_s3c2440); if (retval) goto err; return 0;err: debugfs_remove(s3c2440_udc_debugfs_root); return retval;}static void __exit udc_exit(void){ platform_driver_unregister(&udc_driver_s3c2440); debugfs_remove(s3c2440_udc_debugfs_root);}module_init(udc_init);module_exit(udc_exit);MODULE_AUTHOR(DRIVER_AUTHOR);MODULE_DESCRIPTION(DRIVER_DESC);MODULE_VERSION(DRIVER_VERSION);MODULE_LICENSE("GPL");