please any body help me...
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <asm/gpio.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <asm/uaccess.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <mach/at91_pio.h>
#include <mach/gpio.h>
#include <linux/gpio_keys.h>
#include <asm/delay.h>
struct adc_bus{
struct spi_message adc_msg;
struct spi_transfer adcxfer;
};
struct spi_device *adc_spi;
struct adc_bus *adc_bus;
#define NULL_TERM '\0'
#if 0
#define CS_CHANGE(adcxfer) ((adcxfer).cs_change = 1)
#else
#define CS_CHANGE(adcxfer) ((adcxfer).cs_change = 0)
#endif
int kernel_buf,user_buf;
unsigned char CharCnt;
unsigned int i=10;
int wevents;
int status;
int Buf1Cnt;
int lCnt=0;
int buf;
/************************ADC DRIVER FUNCTIONS******************************/
static int __devinit ADE7758_probe(struct spi_device *spi)
{
adc_spi=spi;
//Format_spi_write_data(&adc_spi->dev);
return 0;
}
/****************************WRITE TO ADC******************/
void Format_spi_write_data(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct adc_bus *bus = kzalloc(sizeof *bus,GFP_KERNEL);
printk("******inwrite***********\n\n");
spi_message_init(&bus->adc_msg);
kernel_buf=1;
printk("\n -------------after spi_message_init------>\n");
bus->adcxfer.tx_buf = kernel_buf;
bus->adcxfer.len = 1;
CS_CHANGE(bus->adcxfer);
spi_message_add_tail(&bus->adcxfer,&bus->adc_msg);
printk("\nAfter msg add---------------->");
// status = spi_sync(spi,&bus->adc_msg);
printk("\n***************After spi_sync--%d------->\n",bus->adcxfer.tx_buf);
}
/*static int user_adc_write(struct file *file,char *buf,unsigned int count, loff_t *loft)
{
unsigned int data;
memset(kernel_buf,NULL_TERM,sizeof(kernel_buf));
//copy_from_user(kernel_buf,buf,count);
//sscanf(&buf[count],"%04d",&data);
printk("\n\n data =%d ",data);
return 0;
}*/
/****************************READ FROM ADC **************************/
void Format_spi_read_data(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct adc_bus *bus = kzalloc(sizeof *bus,GFP_KERNEL);
spi_message_init(&bus->adc_msg);
buf= bus->adcxfer.rx_buf;
bus->adcxfer.len = 1;
CS_CHANGE(bus->adcxfer);
spi_message_add_tail(&bus->adcxfer,&bus->adc_msg);
// status=spi_sync(spi,&bus->adc_msg);
printk("**********in read function*********\n\n");
printk("%d volts",bus->adcxfer.rx_buf);
printk("%d status",status);
printk("**********out of read************\n\n");
}
/*static int user_adc_read(struct file *file,char *buf,unsigned char count, loff_t *ppos)
{
// wait_event_interruptible(prin_queue,wevent!=0);
// copy_to_user(buf,"001",3);
return 0;
}*/
/*********************************READ/WRITE COMPLETE*************************/
static struct spi_driver adcDriver = {
.driver = {
.name = "ADE7758",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ADE7758_probe,
};
static const struct file_operations user_adc_file_fops = {
.owner = THIS_MODULE,
// .read = user_adc_read,
// .write = user_adc_write,
};
static struct miscdevice ADE7758 = { /* creating a misc device called ADE7758 */
MISC_DYNAMIC_MINOR,
// 66,
"AdEDEV", /* NAme sets here, will be shown in /dev*/
&user_adc_file_fops
};
static int __init ADE7758_init(void)
{
int ret;
spi_register_driver(&adcDriver);
printk("\n ADC spi Driver is registered\n");
ret=misc_register(&ADE7758);
printk("\n Misc driver for ADC is registered\n");
Format_spi_write_data(&adc_spi->dev);
__udelay(2000);
Format_spi_read_data(&adc_spi->dev);
return ret;
}
module_init(ADE7758_init);
static void __exit ADE7758_exit(void)
{
spi_unregister_driver(&adcDriver);
misc_deregister(&ADE7758); /*Unregistering the device */
}
module_exit(ADE7758_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("xxx");
MODULE_DESCRIPTION("ADC Driver for ADE7758");
the above is the code with which iam trying to read adc ic but iam not able get the sck high at the adc chip...
dout -0
din- 1
cs -1
sck -0
this is the status of the ports at ic side..please help me to establish comunication between adc and processor
driver for ADE7758 ADC
