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ch34x_pis.c
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ch34x_pis.c
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// Created on: Nov 28, 2013
/*
* File : ch34x_pis.c
*
**********************************************************************
*********** Copyright (C) WCH 2013.11.28 ***************
*********** web: www.wch.cn ***************
*********** AUTHOR: TECH33 ([email protected]) ***************
*********** Used for USB Interface Chip (CH341) ***************
*********** Nanjing QinHeng Electronics Co.,Ltd ***************
**********************************************************************
*
* Running Environment: Linux
* This file is used for CH34x in Epp/MEM/I2C/SPI
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/version.h>
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(ver, rel, seq) ((ver << 16) | (rel <<8) | (seq))
#endif
#define DEBUG
//#undef DEBUG
#ifdef DEBUG
#define dbg( format, arg... ) \
printk( KERN_DEBUG "%s %d: " format "\n", __FILE__, __LINE__, ##arg )
#else
#define dbg( format, arg... ) do{} while(0)
#endif
#define err( format, arg... ) \
printk( KERN_ERR KBUILD_MODNAME ":" format "\n", __FILE__, __LINE__, ##arg)
#define CH34x_VENDOR_ID 0x1A86 //Vendor Id
#define CH34x_PRODUCT_ID 0x5512 //Product Id
#define DRV_NAME "ch34x_pis"
#define DRV_VERSION "WCH CH34x Driver Version V0.1"
#define CH34x_MINOR_BASE 200 //
#define WRITES_IN_FLIGHT 8
#define CH34x_READ_SHORT 8
#define CH34x_PACKET_LENGTH 32
#define MAX_BUFFER_LENGTH 0x1000
//Vendor define
#define VENDOR_WRITE_TYPE 0x40 //vendor write command
#define VENDOR_READ_TYPE 0XC0 //vendor read command
//
#define CH34x_PARA_INIT 0xB1 // Init Parallel
#define CH34x_I2C_STATUS 0x52 //get I2C status
#define CH34x_I2C_COMMAND 0x53 //send I2C command
#define CH34x_BUF_CLEAR 0xB2 //clear uncompleted data
#define CH34x_I2C_CMD_X 0x54 //send I2C command
#define CH34x_DELAY_MS 0x5E
#define VENDOR_VERSION 0x5F //get version of chip
#define CH34x_PARA_CMD_R0 0xAC //read data0 from Para
#define CH34x_PARA_CMD_R1 0xAD //read data1 from Para
#define CH34x_PARA_CMD_W0 0xA6 //write data0 to Para
#define CH34x_PARA_CMD_W1 0xA7 //write data1 to Para
#define CH34x_PARA_CMD_STS 0xA0 //get status of Para
//CH341 COMMAND
#define CH34x_CMD_SET_OUTPUT 0xA1 //set Para output
#define CH34x_CMD_IO_ADDR 0xA2 //MEM IO Addr
#define CH34x_CMD_PRINT_OUT 0xA3 //print output
#define CH34X_CMD_SPI_STREAM 0xA8 //SPI command
#define CH34x_CMD_SIO_STREAM 0xA9 //SIO command
#define CH34x_CMD_I2C_STREAM 0xAA //I2C command
#define CH34x_CMD_UIO_STREAM 0xAB //UIO command
#define CH341A_CMD_UIO_STM_IN 0x00 // UIO Interface In ( D0 ~ D7 )
#define CH341A_CMD_UIO_STM_DIR 0x40 // UIO interface Dir( set dir of D0~D5 )
#define CH341A_CMD_UIO_STM_OUT 0x80 // UIO Interface Output(D0~D5)
#define CH341A_CMD_UIO_STM_US 0xC0 // UIO Interface Delay Command( us )
#define CH341A_CMD_UIO_STM_END 0x20 // UIO Interface End Command
//Single read/write the MAX number of blocks in EPP/MEM
#define CH34x_EPP_IO_MAX ( CH34x_PACKET_LENGTH - 1 )
//CH341A
#define CH34xA_EPP_IO_MAX 0xFF
//request
#define CH34x_DEBUG_READ 0x95 //read two regs
#define CH34x_DEBUG_WRITE 0x9A //write two regs
#define REQUEST_TYPE_READ ( USB_DIR_IN |USB_TYPE_VENDOR | USB_RECIP_OTHER )
#define REQUEST_TYPE_WRITE ( USB_DIR_OUT | USB_TYPE_VENDOR |USB_RECIP_OTHER)
//Ioctl cmd Codes
#define CH34x_GET_DRV_VERSION 0x00000001
#define CH34x_CHIP_VERSION 0x00000003
#define CH34x_FUNCTION_SETPARA_MODE 0x00000004
#define CH34x_FUNCTION_READ_MODE 0x00000005
#define CH34x_FUNCTION_WRITE_MODE 0x00000006
#define CH34x_I2C_READ_MODE 0x00000007
#define CH34x_I2C_WRITE_MODE 0x00000008
#define CH34x_PIPE_DATA_DOWN 0x00000009
#define CH34x_PIPE_WRITE_READ 0x0000000a
#define CH34x_PIPE_DEVICE_CTRL 0x0000000b
static unsigned char Read_Mode; //Read Data Pipe Mode From Para
static unsigned char Write_Mode; //Write Data Pipe Mode From Para
struct ch34x_pis{
struct usb_device *udev; /*the usb device for this device*/
struct usb_interface *interface; /*the interface for this device*/
struct usb_endpoint_descriptor *interrupt_in_endpoint;
size_t interrupt_in_size; /*the size of rec data (interrupt)*/
unsigned char *interrupt_in_buffer; /*the buffer of rec data (interface)*/
struct urb *interrupt_in_urb;
size_t bulk_in_size; /*the size of rec data (bulk)*/
unsigned char *bulk_in_buffer; /*the buffer of rec data (bulk)*/
struct urb *read_urb; /*the urb of bulk_in*/
__u8 bulk_in_endpointAddr; /*bulk input endpoint*/
__u8 bulk_out_endpointAddr; /*bulk output endpoint*/
unsigned char *bulk_out_buffer;
struct semaphore limit_sem; /*semaphore*/
struct usb_anchor submitted; /*usb anchor */
unsigned long VenIc; /*Chip Version(CH341A : 0x0030)*/
int errors;
int open_count; /*count the number of openers*/
spinlock_t err_lock;
struct kref kref;
};
static struct usb_driver ch34x_pis_driver;
static void skel_delete( struct kref *kref );
struct ReadWriteUserData{
unsigned long oReadlen;
unsigned long iBuf;
unsigned long oBuffer;
unsigned long oReturnlen;
};
static DEFINE_MUTEX( io_mutex );
/*usb VID/PID Register Into System*/
static struct usb_device_id ch34x_usb_ids[] =
{
{ USB_DEVICE(CH34x_VENDOR_ID, CH34x_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, ch34x_usb_ids);
static int ch34x_fops_release(struct inode *inode, struct file *file)
{
struct ch34x_pis *dev;
dev = (struct ch34x_pis *)file->private_data;
if( dev == NULL )
return -ENODEV;
mutex_lock( &io_mutex );
if( !--dev->open_count && dev->interface )
usb_autopm_put_interface( dev->interface );
mutex_unlock( &io_mutex );
kref_put( &dev->kref, skel_delete );
return 0;
}
//Control Endpoint Read
static int ch34x_func_read( __u8 request, __u16 value, __u16 index,
struct ch34x_pis *dev, unsigned char *buf, __u16 len)
{
int retval;
/*Control Transform -->usb_control_msg */
retval = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
request, VENDOR_READ_TYPE, value, index, buf, len, 1000);
dbg( "VENDOR_READ_TYPE: 0x%x : 0x%x : 0x%x %d - %d", request,
value, index, retval, len );
return retval;
}
//Control Endpoint Write
//In order to set chip register
static int ch34x_func_write( __u8 request, __u16 value, __u16 index,
struct ch34x_pis *dev, unsigned char *buf,
__u16 len )
{
int retval;
retval = usb_control_msg( dev->udev,
usb_sndctrlpipe(dev->udev, 0), request,
VENDOR_WRITE_TYPE, value, index, buf, len, 1000);
dbg( "VENDOR_READ_TYPE: 0x%x : 0x%x : 0x%x %d - %d", request,
value, index, retval, len );
return retval;
}
//Init Parallel Mode
//iMode-> 00/01 EPP
//iMode-> 02 MEM
static int CH34xInitParallel( unsigned char iMode, struct ch34x_pis *dev )
{
int retval;
__u8 RequestType = VENDOR_WRITE_TYPE;
__u8 Request = CH34x_PARA_INIT;
__u16 Value = ( iMode << 8 )|( iMode < 0x00000100 ? 0x02 : 0x00 );
__u16 Index = 0;
__u16 len = 0;
retval = usb_control_msg( dev->udev,
usb_sndctrlpipe(dev->udev, 0), Request,
RequestType, Value, Index, NULL, len, 1000);
return retval;
}
//usb_fill_bulk_urb cpmplete callback
static void ch34x_write_bulk_callback( struct urb *urb )
{
struct ch34x_pis *dev;
dev = urb->context;
if( urb->status )
{
if( !( urb->status == -ENOENT || urb->status == -ECONNRESET ||urb->status == -ESHUTDOWN))
err("%s - nonzero write bulk status received: %d", __func__, urb->status );
spin_lock( &dev->err_lock );
dev->errors = urb->status;
spin_unlock( &dev->err_lock );
}
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
usb_buffer_free( urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma );
#else
usb_free_coherent( urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma );
#endif
up( &dev->limit_sem );
}
//EPP/MEM Read
ssize_t ch34x_fops_read(struct file *file, char __user *to_user,
size_t count, loff_t *file_pos)
{
struct ch34x_pis *dev;
unsigned char mBuffer[4];
int retval, i;
int j = 0;
unsigned long bytes_read, mNewlen;
int Returnlen;
unsigned long Bytes, totallen = 0;
dev = (struct ch34x_pis *)file->private_data;
if( count == 0 || count > MAX_BUFFER_LENGTH )
{
return count;
}
bytes_read = ( dev->VenIc >= 0x20 )?( CH34xA_EPP_IO_MAX -
(CH34xA_EPP_IO_MAX & ( CH34x_PACKET_LENGTH - 1 ))): CH34x_EPP_IO_MAX;
mNewlen = count / bytes_read;
mBuffer[0] = mBuffer[2] = Read_Mode;
mBuffer[1] = ( unsigned char )bytes_read;
mBuffer[3] = ( unsigned char )( count - mNewlen * bytes_read );
dbg("count %d,->bytes_read %d,->mNewlen %d,->mBuffer[0] %d,->[1] %d,->[2]%d,->[3]%d",count,bytes_read,mNewlen,mBuffer[0],mBuffer[1],mBuffer[2],mBuffer[3]);
if( mBuffer[3] )
mNewlen++;
mutex_lock( &io_mutex );
if( !dev->interface )
{
retval = -ENODEV;
goto exit;
}
mutex_unlock( &io_mutex );
dev->bulk_in_buffer = kmalloc( sizeof( unsigned char ) * count, GFP_KERNEL );
if( dev->bulk_in_buffer == NULL )
{
err("bulk_in_buffer malloc error");
retval = -ENOMEM;
goto exit;
}
for( i = 0; i < mNewlen; i++ )
{
if( (i + 1) == mNewlen && mBuffer[3] )
{
j = 2;
Bytes = mBuffer[3];
}
else
{
j = 0;
Bytes = bytes_read;
}
mutex_lock( &io_mutex );
retval = usb_bulk_msg( dev->udev, usb_sndbulkpipe( dev->udev,
dev->bulk_out_endpointAddr ), mBuffer + j, 0x02, NULL, 10000);
if( retval )
{
retval = -EFAULT;
mutex_unlock( &io_mutex );
err("usb_bulk_msg out error");
goto exit;
}
mutex_unlock( &io_mutex );
mutex_lock( &io_mutex );
retval = usb_bulk_msg( dev->udev, usb_rcvbulkpipe( dev->udev,
dev->bulk_in_endpointAddr ),
dev->bulk_in_buffer + i * bytes_read,
Bytes, &Returnlen, 10000 );
if( retval )
{
retval = -EFAULT;
mutex_unlock( &io_mutex );
err("usb_bulk_msg in error");
goto exit;
}
mutex_unlock( &io_mutex );
totallen += Returnlen;
}
if( copy_to_user( to_user, dev->bulk_in_buffer, totallen ))
retval = -EFAULT;
else
retval = totallen;
kfree( dev->bulk_in_buffer );
exit:
return retval;
}
//EPP/MEM Write
ssize_t ch34x_fops_write(struct file *file, const char __user *user_buffer,
size_t count, loff_t *file_pos)
{
struct ch34x_pis *dev;
int retval = 0;
char *WriteBuf = NULL;
char *buf;
struct urb *urb = NULL;
unsigned int i;
unsigned long mLength, mNewlen, mReturn = 0;
unsigned long write_size;
dev = (struct ch34x_pis *)file->private_data;
if( count == 0 )
goto exit;
else if( count > MAX_BUFFER_LENGTH )
{
err("Data Overlimited,Must Under MAX_BUFFER_LENGTH");
retval = -EFAULT;
goto exit;
}
spin_lock_irq( &dev->err_lock );
if(( retval = dev->errors ) < 0 )
{
dev->errors = 0;
retval = ( retval == -EPIPE ) ? retval : -EIO;
}
spin_unlock_irq( &dev->err_lock );
if( retval < 0 )
goto exit;
mNewlen = count / CH34x_EPP_IO_MAX;
mLength = count - mNewlen * CH34x_EPP_IO_MAX;
mNewlen *= CH34x_PACKET_LENGTH;
buf = (char *)kmalloc( sizeof(unsigned char) * (mNewlen + mLength), GFP_KERNEL );
mutex_lock( &io_mutex );
for( i = 0; i < mNewlen; i += CH34x_PACKET_LENGTH )
{
buf[i] = Write_Mode;
memcpy( buf + i + 1, user_buffer + mReturn, CH34x_EPP_IO_MAX );
mReturn += CH34x_EPP_IO_MAX;
}
if( mLength )
{
buf[i] = Write_Mode;
memcpy( buf + i + 1, user_buffer + mReturn, mLength );
mNewlen += mLength + 1 ;
}
mutex_unlock( &io_mutex );
if( mNewlen > MAX_BUFFER_LENGTH )
{
urb = usb_alloc_urb( 0, GFP_KERNEL );
if( !urb )
{
return -ENOMEM;
goto error;
}
write_size = MAX_BUFFER_LENGTH;
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
WriteBuf = usb_buffer_alloc( dev->udev, write_size,
GFP_KERNEL, &urb->transfer_dma );
#else
WriteBuf = usb_alloc_coherent( dev->udev, write_size,
GFP_KERNEL, &urb->transfer_dma );
#endif
if( !WriteBuf )
{
retval = -ENOMEM;
goto error;
}
if( copy_from_user( WriteBuf, buf, write_size ))
{
retval = -EFAULT;
goto error;
}
mutex_lock( &io_mutex );
if( !dev->interface )
{
mutex_unlock( &io_mutex );
retval = -ENOMEM;
goto error;
}
usb_fill_bulk_urb( urb, dev->udev, usb_sndbulkpipe( dev->udev,
dev->bulk_out_endpointAddr ), WriteBuf, write_size,
ch34x_write_bulk_callback, dev );
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb( urb, &dev->submitted );
retval = usb_submit_urb( urb, GFP_KERNEL );
mutex_unlock( &io_mutex );
if( retval )
{
err("%s - failed submitting write urb,line:%d",
__func__, __LINE__ );
goto error_unanchor;
}
usb_free_urb( urb );
mLength = mNewlen - MAX_BUFFER_LENGTH;
}
else
mLength = mNewlen;
write_size = mLength;
urb = usb_alloc_urb( 0, GFP_KERNEL );
if( !urb )
{
return -ENOMEM;
goto error;
}
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
WriteBuf = usb_buffer_alloc( dev->udev, write_size,
GFP_KERNEL, &urb->transfer_dma );
#else
WriteBuf = usb_alloc_coherent( dev->udev, write_size,
GFP_KERNEL, &urb->transfer_dma );
#endif
if( !WriteBuf )
{
retval = -ENOMEM;
goto error;
}
if( __copy_from_user( WriteBuf + ( mNewlen - mLength), (unsigned char __user*)buf + (mNewlen - mLength), mLength ))
{
retval = -EFAULT;
dbg("copy_from_user error");
goto error;
}
mutex_lock( &io_mutex );
if( !dev->interface )
{
mutex_unlock( &io_mutex );
retval = -ENOMEM;
goto error;
}
/*initialize urb*/
usb_fill_bulk_urb( urb, dev->udev, usb_sndbulkpipe( dev->udev,
dev->bulk_out_endpointAddr ), WriteBuf + (mNewlen - mLength),
write_size, ch34x_write_bulk_callback, dev );
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb( urb, &dev->submitted );
retval = usb_submit_urb( urb, GFP_KERNEL );
mutex_unlock( &io_mutex );
if( retval )
{
err( "%s -failed to write submit urb,line:%d",
__func__, __LINE__ );
goto error_unanchor;
}
usb_free_urb( urb );
kfree( buf );
return mNewlen;
error_unanchor:
usb_unanchor_urb( urb );
error:
if( urb )
{
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
usb_buffer_free( dev->udev, write_size, WriteBuf,
urb->transfer_dma );
#else
usb_free_coherent( dev->udev, write_size, WriteBuf,
urb->transfer_dma );
#endif
usb_free_urb( urb );
}
exit:
return retval;
}
//Write Data for I2C/Flash
static int ch34x_WriteData( unsigned long iLength, unsigned long iBuffer,
struct ch34x_pis *dev)
{
unsigned char *WriteBuf = NULL;
unsigned long length;
struct urb *urb;
int retval = 0;
length = iLength;
if( length <= 0 )
{
goto exit;
}
if( down_interruptible( &dev->limit_sem ))
{
retval = -ERESTARTSYS;
goto exit;
}
spin_lock_irq( &dev->err_lock );
if((retval = dev->errors ) < 0)
{
dev->errors = 0;
retval = ( retval == -EPIPE ) ? retval : -EIO;
}
spin_unlock_irq( &dev->err_lock );
if( retval < 0 ) goto exit;
urb = usb_alloc_urb( 0, GFP_KERNEL );
if( !urb )
{
retval = -ENOMEM;
goto error;
}
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
WriteBuf = usb_buffer_alloc( dev->udev, length,
GFP_KERNEL, &urb->transfer_dma );
#else
WriteBuf = usb_alloc_coherent( dev->udev, length,
GFP_KERNEL, &urb->transfer_dma );
#endif
if( !WriteBuf )
{
retval = -ENOMEM;
goto error;
}
if( copy_from_user( WriteBuf, (long __user *)iBuffer, length ))
{
retval = -EFAULT;
goto error;
}
mutex_lock( &io_mutex );
if( !dev->interface )
{
mutex_unlock( &io_mutex );
retval = -ENODEV;
goto error;
}
/* initialize the urb properly */
usb_fill_bulk_urb( urb, dev->udev, usb_sndbulkpipe( dev->udev,
dev->bulk_out_endpointAddr ), WriteBuf, length,
ch34x_write_bulk_callback, dev );
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb( urb, &dev->submitted );
/* send the data out the bulk port */
retval = usb_submit_urb( urb, GFP_KERNEL );
mutex_unlock( &io_mutex );
if( retval )
{
err("%s - failed to submit writing urb,error %d,line %d",
__func__, retval, __LINE__ );
goto error_unanchor;
}
/*release our reference to this urb*/
usb_free_urb( urb );
return length;
error_unanchor:
usb_unanchor_urb( urb );
error:
if( urb )
{
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
usb_buffer_free( dev->udev, length, WriteBuf,
urb->transfer_dma );
#else
usb_free_coherent( dev->udev, length, WriteBuf,
urb->transfer_dma );
#endif
usb_free_urb( urb );
}
up( &dev->limit_sem );
exit:
return retval;
}
static int ch34x_data_write_read( unsigned long iLength, unsigned long iBuffer,
unsigned long oBuffer, struct ch34x_pis *dev )
{
unsigned long length; // the length of iBuffer
unsigned long totallen;
int bytes_read;
unsigned char *iBuf; // Input data
unsigned char *oBuf; // Output data
struct urb *iUrb;
int i, mSave; // the number of data in a block
int readtimes;
int retval = 0;
dbg("iLength is %d",iLength );
if( iLength < 8 || iLength > MAX_BUFFER_LENGTH + 8 )
{
err(" The length input error");
retval = -EFAULT;
goto exit;
}
iBuf = kmalloc( sizeof(unsigned char) * iLength, GFP_KERNEL );
retval = copy_from_user(iBuf, (char __user*)iBuffer, iLength);
if( retval != 0 )
{
err("copy error");
kfree( iBuf );
goto exit;
}
iLength -= 8;
length = iLength;
mSave = iBuf[iLength];
readtimes = iBuf[iLength + 4];
kfree( iBuf );
dbg("the number of a block %d,should read %d", mSave, readtimes);
if( i * readtimes > MAX_BUFFER_LENGTH || mSave == 0 || readtimes == 0 )
{
return -EFAULT;
goto exit;
}
if( down_interruptible( &dev->limit_sem ))
{
return -ERESTARTSYS;
goto exit;
}
spin_lock_irq( &dev->err_lock );
if((retval = dev->errors) < 0)
{
dev->errors = 0;
retval = (retval == -EPIPE) ? retval : -EIO;
}
spin_unlock_irq( &dev->err_lock );
if( retval < 0 )
goto exit;
iUrb = usb_alloc_urb( 0, GFP_KERNEL );
if( !iUrb )
{
retval = -ENOMEM;
goto error;
}
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
iBuf = usb_buffer_alloc( dev->udev, length,
GFP_KERNEL, &iUrb->transfer_dma );
#else
iBuf = usb_alloc_coherent( dev->udev, length,
GFP_KERNEL, &iUrb->transfer_dma );
#endif
if( !iBuf )
{
retval = -ENOMEM;
goto error;
}
if( copy_from_user( iBuf, (char __user *)iBuffer, length ))
{
retval = -EFAULT;
goto exit;
}
mutex_lock( &io_mutex );
if( !dev->interface )
{
mutex_unlock( &io_mutex );
retval = -ENODEV;
goto error;
}
usb_fill_bulk_urb( iUrb, dev->udev, usb_sndbulkpipe( dev->udev,
dev->bulk_out_endpointAddr ), iBuf, length,
ch34x_write_bulk_callback, dev );
iUrb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb( iUrb, &dev->submitted );
retval = usb_submit_urb( iUrb, GFP_KERNEL );
mutex_unlock( &io_mutex );
if( retval )
{
err("%s-failed submitting write urb in write_read", __func__);
goto error_unanchor;
}
usb_free_urb( iUrb );
// Read Urb Data
totallen = mSave * readtimes;
dbg("mSave : %d, readtimes : %d, totallen : %d", mSave, readtimes, totallen);
oBuf = kmalloc( sizeof( unsigned char ) * totallen, GFP_KERNEL );
totallen = 0;
for( i = 0; i < readtimes; i++ )
{
mutex_lock( &io_mutex );
retval = usb_bulk_msg( dev->udev,
usb_rcvbulkpipe( dev->udev, dev->bulk_in_endpointAddr),
oBuf + i * CH34x_EPP_IO_MAX, CH34x_EPP_IO_MAX, &bytes_read, 10000);
totallen += bytes_read;
mutex_unlock( &io_mutex );
}
dbg("The actual length of Read is %d", totallen);
/*if the read is sucessful,copy the data to userspace*/
if( copy_to_user((char __user *)oBuffer, oBuf, totallen))
{
retval = -ENOMEM;
kfree( oBuf );
goto exit;
}
kfree( oBuf );
return totallen;
error_unanchor:
if( iUrb )
usb_unanchor_urb( iUrb );
error:
if( iUrb )
{
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
usb_buffer_free( dev->udev, length, iBuf,
iUrb->transfer_dma );
#else
usb_free_coherent( dev->udev, length, iBuf,
iUrb->transfer_dma );
#endif
usb_free_urb( iUrb );
}
up( &dev->limit_sem );
exit:
return retval;
}
static void skel_delete( struct kref *kref )
{
struct ch34x_pis *dev = container_of( kref, struct ch34x_pis, kref );
usb_put_dev( dev->udev );
kfree( dev );
}
int ch34x_fops_open(struct inode *inode, struct file *file)
{
struct ch34x_pis *ch34x_p;
struct usb_interface *interface;
int retval = 0;
unsigned int subminor;
#if( LINUX_VERSION_CODE < KERNEL_VERSION( 2, 6, 35) )
subminor = iminor( inode );
#else
subminor = iminor( file->f_path.dentry->d_inode );
#endif
interface = usb_find_interface( &ch34x_pis_driver, subminor );
if ( !interface )
{
err( "%s-error,cannot find device for minor :%d",
__func__, subminor);
retval = -ENODEV;
goto exit;
}
ch34x_p = usb_get_intfdata( interface );
if( !ch34x_p )
{
err("Get interface data error");
retval = -ENODEV;
goto exit;
}
/* add the usage for device*/
kref_get( &ch34x_p->kref );
mutex_lock( &io_mutex );
if( !ch34x_p->open_count++ )
{
retval = usb_autopm_get_interface( interface );
if( retval )
{
ch34x_p->open_count--;
mutex_unlock( &io_mutex );
kref_put( &ch34x_p->kref, skel_delete );
goto exit;
}
}
file->private_data = ch34x_p;
mutex_unlock( &io_mutex );
exit:
return retval;
}
#if( LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35) )
int ch34x_fops_ioctl( struct inode *inode, struct file *file,
unsigned int ch34x_cmd, unsigned long ch34x_arg )
#else
long ch34x_fops_ioctl( struct file *file, unsigned int ch34x_cmd,
unsigned long ch34x_arg )
#endif
{
int err = 0;
int retval = 0;
//char buf[2];
char *buf;
unsigned long bytes_read;
unsigned long bytes_write;
char *drv_version_tmp = DRV_VERSION;
struct ch34x_pis *ch34x_pis_tmp;
void __user *data;
struct ReadWriteUserData rwData;
ch34x_pis_tmp = ( struct ch34x_pis *)file->private_data;
if( ch34x_pis_tmp == NULL )
{
return -ENODEV;
}
switch( ch34x_cmd )
{
case CH34x_GET_DRV_VERSION:
{
retval = copy_to_user( (char __user *)( ch34x_arg ),
( char * )drv_version_tmp, strlen( DRV_VERSION ));
dbg("CH34x_GET_DRV_VERSION Successed");
break;
}
case CH34x_CHIP_VERSION:
{
buf = kmalloc(2, GFP_KERNEL);
if (!buf)
return -ENOMEM;
retval = ch34x_func_read( VENDOR_VERSION,
0x0000, 0x0000, ch34x_pis_tmp, buf, 0x02 );
retval = copy_to_user( (char __user *)( ch34x_arg ),
(char *)buf, 0x02 );
ch34x_pis_tmp->VenIc = buf[1] << 8 | buf[0];
dbg("------> 2 Chip Version is sucessful 0x%02x%02x", buf[1],buf[0]);
kfree(buf);
break;
}
case CH34x_FUNCTION_SETPARA_MODE:
{
retval = ch34x_func_write(CH34x_DEBUG_WRITE, 0x2525,
(unsigned short)( ch34x_arg << 8 | ch34x_arg ),
ch34x_pis_tmp, NULL, 0x00 );
if( retval != 0 )
err("CH34x_FUNCTION_SETPARA_MODE Error");
dbg("------>SetParaMode - ch34x_arg %x", ch34x_arg);
break;
}
case CH34x_FUNCTION_READ_MODE:
{
if( ch34x_arg )
Read_Mode = CH34x_PARA_CMD_R1;
else
Read_Mode = CH34x_PARA_CMD_R0;
dbg( "---->Read_Mode : 0x%x", Read_Mode );
break;
}
case CH34x_FUNCTION_WRITE_MODE:
{
if( ch34x_arg )
Write_Mode = CH34x_PARA_CMD_W1;
else
Write_Mode = CH34x_PARA_CMD_W0;
dbg( "Write_Mode : 0x%x", Write_Mode );
break;
}
case CH34x_I2C_READ_MODE:
{
break;
}
case CH34x_I2C_WRITE_MODE:
{
break;
}
case CH34x_PIPE_DATA_DOWN:
{
dbg("------> Use Pipe Data Down");
data = (void __user *) ch34x_arg;
if (data == NULL)
break;
if (copy_from_user(&rwData, data, sizeof(struct ReadWriteUserData))) {
retval = -EFAULT;
break;
}
if (copy_from_user(&bytes_write, rwData.oReadlen, sizeof(bytes_write) ) ){
retval = -EFAULT;
break;
}
dbg("------> length :%ld", bytes_write);
retval = ch34x_WriteData( bytes_write,
rwData.iBuf,
ch34x_pis_tmp );
break;
}
case CH34x_PIPE_WRITE_READ:
{
unsigned long addr;
dbg("------> Use Pipe Date Write/Read");
data = (void __user *) ch34x_arg;
if (data == NULL)
break;
if (copy_from_user(&rwData, data, sizeof(struct ReadWriteUserData))) {
retval = -EFAULT;
break;
}
dbg("Input number is %d",rwData.oReadlen);
bytes_read = ch34x_data_write_read(rwData.oReadlen, rwData.iBuf,
rwData.oBuffer,ch34x_pis_tmp );
if( bytes_read <= 0 )
{
err("Read Error");
return -EFAULT;
}
dbg("Read bytes is %d", bytes_read);
// retval = put_user( bytes_read, (long __user *)(*(((long *)ch34x_arg) + 3)));
retval = copy_to_user(rwData.oReturnlen, &bytes_read,sizeof(unsigned long));
break;
}
case CH34x_PIPE_DEVICE_CTRL:
{
retval = CH34xInitParallel( (unsigned char)ch34x_arg, ch34x_pis_tmp );
if( retval < 0 )
{
err("Init Parallel Error");
return -EFAULT;
}
break;
}
default:
return -ENOTTY;
break;
}
return 0;
}