📄 adc.c
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/****************************************Copyright (c)**************************************************
** Guangzou ZLG-MCU Development Co.,LTD.
** graduate school
** http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name: adc.c
** Last modified Date: 2005-04-21
** Last Version: 1.0
** Descriptions: This is a Kernel module for uClinux 2.4.x .** This module let uClinux 2.4.x can use adc.
**------------------------------------------------------------------------------------------------------
** Created by: Chenmingji
** Created date: 2005-04-21
** Version: 1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#define IN_adc#include "config.h"/********************************************************************************************************
function announce********************************************************************************************************/
#if 0static loff_t adc_llseek(struct file *filp, loff_t off, int whence);static ssize_t adc_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos);#endifstatic ssize_t adc_read(struct file *filp, char *buf, size_t count, loff_t *f_pos);
static int adc_open(struct inode *inode, struct file *filp);static int adc_release(struct inode *inode, struct file *filp); static int adc_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long param);int adc_init(void);void adc_cleanup(void);
/********************************************************************************************************
function announce********************************************************************************************************/
#define MAJOR_NR majormodule_init(adc_init);module_exit(adc_cleanup);MODULE_PARM(major, "i");MODULE_LICENSE("Proprietary");MODULE_DESCRIPTION("Guangzou ZLG-MCU Development Co.,LTD.\ngraduate school\nhttp://www.zlgmcu.com");MODULE_SUPPORTED_DEVICE("uClinux2.4.x LPC2200 adc");MODULE_AUTHOR("chenmingji");/*********************************************************************************************************
** "全局和静态变量在这里定义"
** global variables and static variables define here
********************************************************************************************************/
static int major = ADC_MAJOR_NR;
static u32 PinSel1Save;
static unsigned int adc_usage[MAX_ADC]; /* device using count */
static u32 AdcrSave;/********************************************************************************************************/
static struct file_operations adc_fops = /* driver info */{ owner: THIS_MODULE,#if 0 llseek: adc_llseek, write: adc_write,#endif read: adc_read, ioctl: adc_ioctl, open: adc_open, release: adc_release,};#if 0/*********************************************************************************************************
** Function name: adc_llseek
** Descriptions: move read and write point
** Input: filp: pointer of file
** off: ofset
** whence: move mode
** 0: seek set
** 1: seek file' current point
** 2: seek file' end
** Output : new point
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static loff_t adc_llseek(struct file *filp, loff_t off, int whence){ return 0;}#endif
/*********************************************************************************************************
** Function name: adc_read
** Descriptions: read device
** Input: filp: pointer of file
** buf: buf for save data
** count: size for read
** f_pos: *f_pos = read point
** Output : read size
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static ssize_t adc_read(struct file *filp, char *buf, size_t count, loff_t *f_pos){
unsigned long flag; u32 temp;
u16 temp1;
u8 temp2;
if (count > 2)
{ return -EFBIG;
}
if (!access_ok(VERIFY_WRITE, (void *)buf, count))
{
return -EFAULT; }
temp = (int)filp->private_data;
local_irq_save(flag);
outl(AdcrSave | (1u << temp) | (1u << 24), ADCR);
while (1)
{
temp = inl(ADDR);
if ((temp & (1u << 31)) != 0)
{
break;
}
}
local_irq_restore(flag);
temp1 = temp & 0xffff;
if (count == 1)
{
temp2 = temp1 >> 8;
put_user(temp2, (u8 *)buf);
}
if (count == 2)
{
put_user(temp1, (u16 *)buf);
}
return count;}
#if 0/*********************************************************************************************************
** Function name: adc_write
** Descriptions: write device
** Input: filp: pointer of file
** buf: buf to write data
** count: size for write
** f_pos: *f_pos = write point
** Output : write size
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static ssize_t adc_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos){ return 0;}#endif /*********************************************************************************************************
** Function name: adc_open
** Descriptions: open device
** Input:inode: information of device
** filp: pointer of file
** Output 0: OK
** other: not OK
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static int adc_open(struct inode *inode, struct file *filp){
unsigned long flag; int num, temp;
num = MINOR(inode->i_rdev); if (num >= MAX_ADC) { return -ENODEV; }
if (adc_usage[num] == 0)
{
local_irq_save(flag); temp = num + num ;
outl(inl(PINSEL1) & (~(0x03 << (temp + 22))), PINSEL1);
outl(inl(PINSEL1) | (0x01 << (temp + 22)), PINSEL1);
filp->private_data = (void *)(num);
local_irq_restore(flag);
} adc_usage[num]++;
MOD_INC_USE_COUNT; return 0; /* success */} /*********************************************************************************************************
** Function name: adc_release
** Descriptions: release device
** Input:inode: information of device
** filp: pointer of file
** Output 0: OK
** other: not OK
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static int adc_release(struct inode *inode, struct file *filp) { unsigned long flag; int num;
u32 temp, temp1;
num = MINOR(inode->i_rdev); if (num >= MAX_ADC) { return -ENODEV; }
MOD_DEC_USE_COUNT; adc_usage[num]--;
if (adc_usage[num] == 0)
{
local_irq_save(flag);
temp = temp1 = inl(PINSEL1);
temp &= (PinSel1Save & (0x03 << (num * 2 + 22))) |
(temp1 & ~((0x03 << (num * 2 + 22))));
outl(temp, PINSEL1);
local_irq_restore(flag); }
return(0); } /*********************************************************************************************************
** Function name: adc_ioctl
** Descriptions: IO control function
** Input:inode: information of device
** filp: pointer of file
** cmd: command
** arg: additive parameter
** Output 0: OK
** other: not OK
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static int adc_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg){
u32 temp;
if (_IOC_TYPE(cmd) != ADC_IOC_MAGIC) { return -ENOTTY; } if (_IOC_NR(cmd) >= ADC_MAXNR) { return -ENOTTY; }
switch(cmd) { case ADC_SET_CLKDIV:
temp = AdcrSave;
temp &= (~(0xff << 8));
temp |= ((arg & 0xff) << 8); AdcrSave = temp; break; case ADC_SET_BITS:
arg &= 0x0f;
if (arg < 3)
{
arg = 3;
}
if (arg > 10)
{
arg = 10;
}
arg++;
arg = 11 - arg;
temp = AdcrSave;
temp &= ~(0x07 << 17);
temp |= (arg << 17); AdcrSave = temp; break;
default: return -ENOTTY; break; } return 0;}
/*********************************************************************************************************
** Function name: adc_init
** Descriptions: init driver
** Input:none
** Output 0: OK
** other: not OK
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
int adc_init(void){ int result;
result = register_chrdev(MAJOR_NR, DEVICE_NAME, &adc_fops); if (result < 0) { printk(KERN_ERR DEVICE_NAME ": Unable to get major %d\n", MAJOR_NR ); return(result); }
if (MAJOR_NR == 0) { MAJOR_NR = result; /* dynamic */ }
PinSel1Save = inl(PINSEL1) & (0xff << 22);
AdcrSave = (0xff << 8) | (0x00 << 17) | (1 << 21);
outl(0, ADCR);
printk(KERN_INFO DEVICE_NAME ": init OK\n"); return(0); }/*********************************************************************************************************
** Function name: adc_cleanup
** Descriptions: exit driver
** Input:none
** Output none
** Created by: Chenmingji
** Created Date: 2005-4-21
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void adc_cleanup(void){
outl(0, ADCR);
outl(inl(PINSEL1) & (~(0xff << 22)), PINSEL1);
outl(inl(PINSEL1) | PinSel1Save, PINSEL1);
unregister_chrdev(MAJOR_NR, DEVICE_NAME);}/*********************************************************************************************************** End Of File********************************************************************************************************/⌨️ 快捷键说明
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