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/***************************************************************
A globalmem driver as an example of char device drivers
The initial developer of the original code is Baohua Song
<author@linuxdriver.cn>. All Rights Reserved.
****************************************************************/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include "ipc_info.h"
#define MCOM_FIFO_SIZE 0x1000 /*全局内存最大4K字节*/
/*globalmem设备结构体*/
struct mcom_dev {
dev_t devno ;
struct cdev cdev; /*cdev结构体*/
char buf[MCOM_FIFO_SIZE]; /*全局内存*/
};
struct mcom_dev *mcom_devp; /*设备结构体指针*/
/*文件打开函数*/
int mcom_open(struct inode *inode, struct file *filp)
{
/*将设备结构体指针赋值给文件私有数据指针*/
filp->private_data = mcom_devp;
printk("%s[%d] %s\r\n", __FILE__, __LINE__, __func__);
return 0;
}
/*文件释放函数*/
int mcom_release(struct inode *inode, struct file *filp)
{
return 0;
}
const char* ipc_info_str[] = {
"IDLE",
"IRQ_IND",
"CONNECT_REQ",
"CONNECTED",
"DISCONNECT_REQ",
"DISCONNECTED",
"IPC_STATUS_FLOW_STOP",
"IPC_STATUS_INVALID_PACKET",
"CRC_ERROR",
"PACKET_ERROR",
"INVAILD"
};
const char* _get_status_string(u32 status)
{
if(status >= IPC_STATUS_INVAILD) {
return ipc_info_str[IPC_STATUS_INVAILD];
}
return ipc_info_str[status];
}
#define MAX_MCOM_DELAY_SECOND 3
#define MAX_MCOM_READ_DELAY_MS (MAX_MCOM_DELAY_SECOND*1000)
static u32 s_write_sdio_count = 0;
static u32 s_read_sdio_count = 0;
static u32 s_write_payload_count = 0;
static u32 s_read_payload_count = 0;
static u32 s_prv_read_time = 0;
/*读函数*/
static ssize_t mcom_read(struct file *filp, char __user *buf, size_t size,loff_t *ppos)
{
int ret = 0;
int len = 0;
int speed = 0;
int payload_speed = 0;
struct mcom_dev *dev = filp->private_data; /*获得设备结构体指针*/
char* buf_ptr = &dev->buf[0];
IPC_INFO_T* ipc_ptr = NULL;
msleep(MAX_MCOM_READ_DELAY_MS);
len = sprintf(buf_ptr, "\r\n\t\tphy_speed\tpayload_speed\t\trate\tmux\t\tsdio\t\t saved\tflow_stop\tinvalid\tovfl\tperr\tcerr\tstatus\r\n");
ret = len;
ipc_ptr = ipc_info_getinfo(IPC_TX_CHANNEL);
if(!s_prv_read_time) {
speed = 0;
payload_speed = 0;
} else {
speed = (ipc_ptr->sdio_count - s_write_sdio_count)/(jiffies_to_msecs(jiffies) - jiffies_to_msecs(s_prv_read_time))*1000;
payload_speed = (ipc_ptr->payload_count - s_write_payload_count)/(jiffies_to_msecs(jiffies) - jiffies_to_msecs(s_prv_read_time))*1000;
}
len = sprintf(&buf_ptr[ret], "MCOM Write:\t%u\t\t%u\t\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%s\r\n", \
speed,payload_speed, ipc_ptr->rate, ipc_ptr->mux_count,ipc_ptr->sdio_count, ipc_ptr->saved_count,
ipc_ptr->flow_stop_count,ipc_ptr->invalid_pkt_count, ipc_ptr->overflow_count, ipc_ptr->packet_error_count, \
ipc_ptr->crc_error_count,_get_status_string(ipc_ptr->status));
ipc_ptr->rate = 0;
s_write_sdio_count = ipc_ptr->sdio_count;
s_write_payload_count = ipc_ptr->payload_count;
ret += len;
ipc_ptr = ipc_info_getinfo(IPC_RX_CHANNEL);
if(!s_prv_read_time) {
speed = 0;
payload_speed = 0;
} else {
speed = (ipc_ptr->sdio_count - s_read_sdio_count)/(jiffies_to_msecs(jiffies) - jiffies_to_msecs(s_prv_read_time))*1000;
payload_speed = (ipc_ptr->payload_count - s_read_payload_count)/(jiffies_to_msecs(jiffies) - jiffies_to_msecs(s_prv_read_time))*1000;
}
len = sprintf(&buf_ptr[ret], "MCOM Read:\t%u\t\t%u\t\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%u\t%s\r\n",
speed, payload_speed, ipc_ptr->rate,ipc_ptr->mux_count,ipc_ptr->sdio_count, ipc_ptr->saved_count,
ipc_ptr->flow_stop_count, ipc_ptr->invalid_pkt_count, ipc_ptr->overflow_count, ipc_ptr->packet_error_count,
ipc_ptr->crc_error_count, _get_status_string(ipc_ptr->status));
s_read_sdio_count = ipc_ptr->sdio_count;
s_read_payload_count = ipc_ptr->payload_count;
ipc_ptr->rate = 0;
ret += len;
buf_ptr[ret] = 0;
s_prv_read_time = jiffies;
len = (ret < size) ? ret : size;
/*内核空间->用户空间*/
if (copy_to_user(buf, (void*)buf_ptr, len)) {
len = - EFAULT;
}
return len;
}
/*写函数*/
static ssize_t mcom_write(struct file *filp, const char __user *buf, size_t size, loff_t *ppos)
{
return - EFAULT;
}
/*文件操作结构体*/
static const struct file_operations mcom_fops = {
.owner = THIS_MODULE,
.read = mcom_read,
.open = mcom_open,
.release = mcom_release,
};
static char *mcom_devnode(struct device *dev, mode_t *mode)
{
return kasprintf(GFP_KERNEL, "mcom/%s", dev_name(dev));
}
static struct class *mcom_class;
static int mcom_major = 0;
/*设备驱动模块加载函数*/
int __init mcom_init(void)
{
int err = 0;
int result;
dev_t devno ;
/* 申请设备号*/
result = alloc_chrdev_region(&devno, 0, 1, "mcom");
mcom_major = MAJOR(devno);
if (result < 0)
return result;
/* 动态申请设备结构体的内存*/
mcom_devp = kmalloc(sizeof(struct mcom_dev), GFP_KERNEL);
if (!mcom_devp) { /*申请失败*/
result = - ENOMEM;
goto fail_malloc;
}
memset(mcom_devp, 0, sizeof(struct mcom_dev));
/*初始化并注册cdev*/
cdev_init(&mcom_devp->cdev, &mcom_fops);
mcom_devp->cdev.owner = THIS_MODULE;
mcom_devp->cdev.ops = &mcom_fops;
err = cdev_add(&mcom_devp->cdev, devno, 1);
if (err)
printk(KERN_NOTICE "%s:%sError %d\r\n",__FILE__, __func__, err);
mcom_devp->devno = devno;
mcom_class = class_create(THIS_MODULE, "mcom");
if (IS_ERR(mcom_class)) {
printk(KERN_ERR "Error creating mcom class.\n");
cdev_del(&mcom_devp->cdev);
goto fail_malloc;
}
mcom_class->devnode = mcom_devnode;
device_create(mcom_class, NULL, devno, NULL, "mcom");
return 0;
fail_malloc:
unregister_chrdev_region(devno, 1);
return result;
}
/*模块卸载函数*/
void __init mcom_exit(void)
{
cdev_del(&mcom_devp->cdev); /*注销cdev*/
kfree(mcom_devp); /*释放设备结构体内存*/
unregister_chrdev_region(&mcom_devp->devno, 1); /*释放设备号*/
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@openezx.org>");
MODULE_DESCRIPTION("GSM TS 07.10 Multiplexer");
module_init(mcom_init);
module_exit(mcom_exit);
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