void reset_fd(void)
{
get_stdin(0);
get_stdout(1);
get_stderr(2);
if (get_pipes(0))
while (get_pipes(-1));
}
void check_nb_pipes(const char *str)
{
int i;
i = -1;
while (str[++i])
{
if (str[i] == '|')
get_pipes(1);
}
}
//probe书中有教
static int our_probe(struct usb_interface *intf,
const struct usb_device_id *id){
struct us_data *us;
int result;
//device
struct device *dev;
//scsihost
struct Scsi_Host *host;
//检测id是否符合 和intf
struct us_unusual_dev *unusual_dev;
unusual_dev=(id - usb_storage_usb_ids) + us_unusual_dev_list;
if(usb_usual_check_type(id,USB_US_TYPE_STOR) || usb_usual_ignore_device(intf))
return -ENXIO;
printk(KERN_ALERT "probe usb usb detected!\n");
//分配个host
host = scsi_host_alloc(&usb_stor_host_template,sizeof(*us));
if(!host){
dev_warn(&intf->dev,"fail to allocate the scsi host\n");
return -ENOMEM;
}
//host中的一些初始化
host->max_cmd_len = 16;
host-> sg_tablesize = usb_stor_sg_tablesize(intf);
us= host_to_us(host);//us 作为host中 的us
//分内存？
memset(us,0,sizeof(struct us_data));
mutex_init(&(us->dev_mutex));
init_completion(&us->cmnd_ready);
init_completion(&(us->notify));
init_waitqueue_head(&us->delay_wait);
INIT_DELAYED_WORK(&us->scan_dwork,usb_stor_scan_dwork);
result = associate_dev(us,intf);
if(result)
goto Bad;
result = get_device_info(us,id,unusual_dev);
if(result)
goto Bad;
//transport protocol
get_transport(us);
get_protocol(us);
if(!us->transport ||!us->proto_handler){
result=-ENXIO;
goto Bad;
}
printk(KERN_ALERT"Transport: %s\n",us->transport_name);
printk(KERN_ALERT"Protocol: %s\n",us->transport_name);
dev = &us->pusb_intf->dev;
//设置max lun
if(us->fflags & US_FL_SINGLE_LUN)
us->max_lun =0;
//endpoint get pipe
result = get_pipes(us);
if(result)
goto Bad;
//如果u盘前十个指令错误，重置
if (us->fflags & US_FL_INITIAL_READ10)
set_bit(US_FLIDX_REDO_READ10, &us->dflags);
//申请子资源，添加进host
result=usb_stor_acquire_sesources(us);
if(result)
goto Bad;
snprintf(us->scsi_name,sizeof(us->scsi_name),"our-usb-storage%s",dev_name(&us->pusb_intf->dev));
result= scsi_add_host(us_to_host(us),dev);
if(result){
printk(KERN_ALERT"UNable to add the host\n");
goto Bad;
}
//scsi设备延时探测
usb_autopm_get_interface_no_resume(us->pusb_intf);
set_bit(US_FLIDX_SCAN_PENDING,&us->dflags);
if(delay_use>0)
dev_dbg(dev,"waiting for device before scanning\n");
queue_delayed_work(system_freezable_wq,&us->scan_dwork,delay_use * HZ);
return 0;
Bad:
printk(KERN_ALERT "probe false!\n");
release_everything(us);
return result;
}
static int rts51x_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct Scsi_Host *host;
struct rts51x_chip *chip;
struct rts51x_usb *rts51x;
int result;
struct task_struct *th;
RTS51X_DEBUGP("%s detected\n", RTS51X_NAME);
rts51x = kzalloc(sizeof(struct rts51x_usb), GFP_KERNEL);
if (!rts51x) {
printk(KERN_WARNING RTS51X_TIP
"Unable to allocate rts51x_usb\n");
return -ENOMEM;
}
host = scsi_host_alloc(&rts51x_host_template, sizeof(*chip));
if (!host) {
printk(KERN_WARNING RTS51X_TIP
"Unable to allocate the scsi host\n");
kfree(rts51x);
return -ENOMEM;
}
host->max_cmd_len = 16;
chip = host_to_rts51x(host);
memset(chip, 0, sizeof(struct rts51x_chip));
chip->vendor_id = id->idVendor;
chip->product_id = id->idProduct;
mutex_init(&(rts51x->dev_mutex));
init_completion(&rts51x->cmnd_ready);
init_completion(&rts51x->control_exit);
init_completion(&rts51x->polling_exit);
init_completion(&(rts51x->notify));
#ifdef SCSI_SCAN_DELAY
init_waitqueue_head(&rts51x->delay_wait);
init_completion(&rts51x->scanning_done);
#endif
chip->usb = rts51x;
result = associate_dev(chip, intf);
if (result)
goto BadDevice;
result = get_pipes(chip);
if (result)
goto BadDevice;
result = rts51x_acquire_resources(chip);
if (result)
goto BadDevice;
th = kthread_run(rts51x_control_thread, chip, RTS51X_CTL_THREAD);
if (IS_ERR(th)) {
printk(KERN_WARNING RTS51X_TIP
"Unable to start control thread\n");
result = PTR_ERR(th);
goto BadDevice;
}
rts51x->ctl_thread = th;
result = scsi_add_host(rts51x_to_host(chip), &rts51x->pusb_intf->dev);
if (result) {
printk(KERN_WARNING RTS51X_TIP "Unable to add the scsi host\n");
goto BadDevice;
}
#ifdef SCSI_SCAN_DELAY
th = kthread_create(rts51x_scan_thread, chip, RTS51X_SCAN_THREAD);
if (IS_ERR(th)) {
printk(KERN_WARNING RTS51X_TIP
"Unable to start the device-scanning thread\n");
complete(&rts51x->scanning_done);
quiesce_and_remove_host(chip);
result = PTR_ERR(th);
goto BadDevice;
}
wake_up_process(th);
#else
scsi_scan_host(rts51x_to_host(chip));
#endif
th = kthread_run(rts51x_polling_thread, chip, RTS51X_POLLING_THREAD);
if (IS_ERR(th)) {
printk(KERN_WARNING RTS51X_TIP
"Unable to start polling thread\n");
result = PTR_ERR(th);
goto BadDevice;
}
rts51x->polling_thread = th;
#ifdef CONFIG_PM
if (ss_en) {
rts51x->pusb_intf->needs_remote_wakeup = needs_remote_wakeup;
SET_PM_USAGE_CNT(chip, 1);
RTS51X_DEBUGP("pm_usage_cnt = %d\n", GET_PM_USAGE_CNT(chip));
}
#endif
return 0;
BadDevice:
RTS51X_DEBUGP("rts51x_probe() failed\n");
release_everything(chip);
return result;
}
