NXP恩智浦PN544driver驱动程序.docx
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NXP恩智浦PN544driver驱动程序
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siyahkernel/drivers/misc/pn544・c
iy*
*Copyright（C）20JOTrustedLogicSA.
*
*Thisprogramisfreesoftware;youcanredistributeitand/ormodify
*itunderthetermsoftheGNUGeneralPublicLicenseaspublishedby
*theFreeSoftwareFoundation;eitherversion2oftheLicense,or
*（atyouroption）anylaterversion.
*
*Thisprogramisdistributedinthehopethatitwillbeuseful,
*butWITHOUTANYWARRANTY;withouteventheimpliedwarrantyof
*MERCHANTABILITYorFITNESSFORAPARTICULARPURPOSE.Seethe
*GNUGeneralPublicLicenseformoredetails.
*
*YoushouldhavereceivedacopyoftheGNUGeneralPublicLicense
*alongwiththisprogram;ifnot.writetotheFreeSoftware
*Foundation,Inc.,51FranklinSt,FifthFloor,Boston,MA02110-1301USA
*
V
20#include
21#include
22#include
23#include
24#include
25#include
26#include
27#include
28#include
29#include
30#include
31#include
32#include
33#include
34#include
35#include
36#include
37#include
38
38#defineMAXBUFFERSIZE512
39#defineMAXLLCFRAMESIZE0x20
40#defineMAXTRYI2CREAD10
42
43#defineNFCDEBUG0
44
do_reading;
voidpn544_disable_irq（structpn544_dev*pn544_dev）
unsignedlongflags;
spinjock_irqsave（&pn544_dev・>irq_enablcd_lock,flags）;
if（pn544_dev->irq_enabled）{disablejrq_nosync（pn544_dev->client->irq）;pn544_dev->irq_enabled=false;
}
spin_unlock_irqrestore（&pn544_dev->irq_enabled_lock,flags）;
irqreturn_tpn544_dev_irq_handler（intirq,void*dev_id）structpn544_dev*pn544_dev=devoid;
if（!
gpio_get_value（pn544_dev->irq_gpio））
returnIRQ_HANDLED：
pn544_disable_irq（pn544_dev）;
/*Wakeupwaitingreaders*/
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55};
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57bool
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59static
60{
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69}
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71static
72{
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wake_up（&pn544_dev・>read_wq）;
81do_reading=l;
82
82#ifNFC_DEBUG
83pr_info（"pn544:
call\n）;
84#endif
86
85returnIRQ_HANDLED;
86}
89
87staticssize_tpn544_dev_read（structfile*filp,char_user*buf,
88size_tcount,loffLt^offset）
89{
90structpn544_dev*pn544_dev=filp->private_data;
91chartmp[MAX_BUFFER_SIZE];
92intret;
93chardatasizelength=1;
94chardatasize=0;
95charreadingWatchdog=0;
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100
101if（count>MAX_BUFFER_SIZE）
102count=MAX_BUFFER_SIZE;
103
103pr_debug（"%s:
reading%zubytes.irq=%s\n'\_func_,
104count,gpio_get_value（pn544_dev->irq_gpio）?
'10）;
106
105#ifNFC_DEBUG
106pr_info（"pn544:
+r\n"）;
107#endif
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108mutex_Iock（&pn544_dev->read_mutex）;
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113wait_irq:
if（!
gpio_get_value（pn544_dev->irq_gpio））{
if（filp->f_flags&O_NONBLOCK）{
prJnfoCs:
O_NONBLOCK\n”，_func_）;ret=-EAGAIN;
gotofail;
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pn544_dev->irq_enabled=true;do_reading=0;
enable_irq（pn544_dev->client->irq）;
ret=wait_evenMnterruptible（pn544_dev・>read_wq,do_reading）;
/*gpio_get_value（pn544_dev->irq_gpio））;*/
/*pr_info（"pn544:
h\/i*/pn544_disable_irq（pn544_dev）;
132#ifNFC_DEBUG
133pr_info（Hpn544:
h\nH）;
134#endif
135
136if（ret）
137gotofail;
138}
139/*Readdata*/
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151down*/
if（count==1y^NonnalmodeV
{
ret=i2c_master_recv（pn544_dev->client,tmp.datasizelength）;
if（copy_to_user（buf,tmp,datasizelength））{
pr_warning（H%s:
failedtocopytouserspaceXn",_func_）return-EFAULT;
}
Ifbadframeisreceivedfrompn544,weneedtoreadagainafterwaitingthatI
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if（MAX_LLC_FRAME_SIZEpr_err（1'pn544_devsize>MAX_LLC_FRAME_SIZEreceived!
M）msleep
（2）/<$7^7?
2mstowaitIRQfalldown
readingWatchdog++;
gotowaitjrq;
）
datasize=tnip[0];
ret=i2c_master_recv（pn544_dev->client,tmp.datasize）;
mutex_unlock（&pn544_dev->read_mutex）;
if（ret<0）{
pr-errC'^s：
i2c_master_recvreturned%d\n",_func_,ret）;
returnret;
}
if（ret>datasize+1）{
pr_err（'%s:
receivedtoomanybytesfromi2c（%d）\n*\
—func—,ret）;
return・EIO;
I
if（copy_to_user（buf+l,tmp,ret））{
pr_err（'%s:
failedtocopytouserspace\nH,_func_）;
return-EFAULT;
}
//addonemorebyteforsizebyte（readonfirsttime）
ret++;
1
else/^downloadmode^/
{
ret=i2c_master_recv（pn544_dev->client,tmp,count）;
Ifbadframeisreceivedfrompn544.weneedtoreadagainafterwaitingthatI
if（MAX_LLC_FRAME_SIZEpr_err（''pn544_dev_read:
size>MAX_LLC_FRAME_SIZEreceived!
Jmsleep
（2）/2mstowaitIRQfalldown
readingWatchdog++:
gotowait_irq;
I
mutex^unlock（&pn544_dev・>read_mutex）;
if（ret<0）{
pr_err（"%s:
i2c_master_recvreturned%d\n'\_func_,ret）;
returnret;
}
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188down*/
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if（ret>count）{
pr_err（"r7s:
receivedtoomanybytesfromi2c（%d）\n",—func—,ret）;
return-EIO;
if（copy_to_iiser（biif,tmp,ret））{
pr_err（，65s:
failedtocopytouserspace'rf；_func_）;return-EFAULT;
I
}
returnret;
mutex^unlock（&pn544_dev・>read_mutex）;
223staticssize_tpn544_dev_write（structfile*filp,constchar_user*buf,
224size_tcount,loff_t^offset）
225{
226structpn544_dev*pn544_dev;
227chartmp[MAX_BUFFER_SIZE];
228intret;
229
229pn544_dev=filp->private_data;
231
232#ifNFC_DEBUG
if（count>MAX_BUFFER_SIZE）
count=MAX_BUFFER_SIZE;
if（copy_from_user（tmp,buf,count））{
pr_err（*s:
failedtocopyfromuserspaccXn",_func_）;return-EFAULT;
}
pr_debug（writing%zubytes.\iiH,_func_,count）;
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258）
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260static
261{
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273static
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275{
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ret=i2c_master_send（pn544_dev->client,tmp,count）;
247248#ifNFCDEBUG
249
250#endif
pr_info（"pn544:
-w\n"）;
if（ret!
=count）{
pr_err（"^s:
i2c_master_sendreturned%d\n'\_func_,ret）;ret=-EIO;
）
returnret;
intpn544_dev_open（structinode*inode,structfile*filp）
structpn544_dev*pn544_dev=container_of（filp->private_data,structpn544_dev,pn544_device）;
filp->private_data=pn544_dev;
pr_debug（"%s:
%d,%d\n",_func_,imajor（inode）,iininor（inode））;
return0;
intpn544_dev_ioctl（structinode*inode,structfile*filp.
unsignedintcmd,unsignedlongarg）
structpn544_dev*pn544_dev=filp->private_data;
switch（cmd）{
casePN544_SET_PWR:
if（arg==2）{
/*poweronwithfirmwaredownload（requireshwreset）*/
pr_info（'%spoweronwithfirniware\n\_func_）;gpio_set_value（pn544_dev・>ven_gpio.1）;gpio_seCvakie（pn544_dev->firm_gpio,1）;
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msleep（lO）;gpio_set_value（pn544_dev->ven_gpio,0）;msleep（lO）;
gpio_set_value（pn544_dev->ven_gpio,1）;msleep（lO）;
}elseif（arg==1）{
/*poweron*/pr_info（"%spoweron\n",_func_）;gpio_set_value（pn544_dev->firm_gpio,0）;gpio_set_value（pn544_dev->ven_gpio,1）;msleep（lO）;
}elseif（arg==0）{
/*poweroff*/
pr_info（"%spoweroffXn_func_）;
gpio_set_value（pn544_dev->firm_gpio,0）;gpio_set_value（pn544_dev->ven_gpio,0）;msleep（10）;
}else{
pr_err（"%sbadarg%u\n",_func_,arg）;return-EINVAL;
}
break;
default:
pr_err（M%sbadioctl%u\nM,_func_,cmd）;return-EINVAL;
}return0;
conststructfile_operationspn544_dev_fops={.owner=THIS_MODULE,
.llseek=no_llseek,
・read=pn544_dev_read,
・write=pn544_dev_write,
・open=pn544_dev_open,
.ioctl=pn544_dev_ioctl,
intpn544_probe（structi2c_client^client,
conststructi2c_device_id*id）
intret;
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structpn544_i2c_platform_data*platform_data;
structpn544_dev*pn544_dev;
platform_data=client->dev.platform_data;
if（platform_data=NULL）{
pr_err（"%s:
nfcprobe_func_）;
return-ENODEV;
）
if（!
i2c_check_functionality（client->adapter,I2C_FUNC_I2C））{
pr_err（“心：
needI2C_FUNC_I2C\n",_func_）;
return-ENODEV;
}
ret=gpio_request（platform_data->irq_gpio,"nfc_int）;
if（ret）
return-ENODEV;
ret=gpio_request（platform_data->ven_gpio,nnfc_ven）;
if（ret）
gotoerr_ven;
ret=gpio_request（platform_data->firm_gpio,Hnfc_firm）;
if（ret）
gotoerr_firm;
pn544_dev=kzalloc（sizeof（*pn544_dev）,GFP_KERNEL）;
if（pn544_dev==NULL）{
dev_err（&clien卜〉dev,
"failedtoallocatememoryformoduledata\nM）;ret=-ENOMEM;
gotoerr_exit;
}
pMnfoC*%s:
IRQmini_func_,client->irq）;
pn544_dev->irq_gpio=platform_data->irq_gpio;
pn544_dev->ven_gpio=platform_data->ven_gpio;pn544_dev->firni_gpio=platform_data->firm_gpio;pn544_dev->client=client;
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/*initmutexandqueuesV
init_waitqueue_head（&pn544_dev->read_wq）;mutex_init（&pn544_dev->read_mutex）;
spin_lock_init（&pn544_dev->irq_enabled_lock）;
pn544_dev->pn544_device,minor=MISC_DYNAMIC_MINOR;pn544_dev->pn544_device.name=pn54
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