library control management Pi final

smoke/smoke_dev.c

@@ -17,14 +17,14 @@
 
 #define GPFSEL0      0x00
 #define GPFSEL1      0x04
-#define SPI_CS      0x00
-#define SPI_FIFO   0x04
+#define CS      0x00
+#define FIFO   0x04
 
 static void __iomem *gpio_base;
 static void __iomem *spi_base;
 
 volatile unsigned int *gpfsel0, *gpfsel1;
-volatile unsigned int *spi_cs, *spi_fifo;
+volatile unsigned int *cs, *fifo;
 
 int smoke_open(struct inode *inode, struct file *filp){
    printk(KERN_ALERT "smoke detection sensor driver open!!\n");
@@ -34,19 +34,19 @@ int smoke_open(struct inode *inode, struct file *filp){
    
    gpfsel0 = (volatile unsigned int*)(gpio_base + GPFSEL0);
    gpfsel1 = (volatile unsigned int*)(gpio_base + GPFSEL1);
-   spi_cs = (volatile unsigned int*)(spi_base + SPI_CS);
-   spi_fifo = (volatile unsigned int*)(spi_base + SPI_FIFO);
+   cs = (volatile unsigned int*)(spi_base + CS);
+   fifo = (volatile unsigned int*)(spi_base + FIFO);
  
    *gpfsel0 &= ~(0x1FF << 21);
    *gpfsel0 |= (0x24 << 24);
    *gpfsel1 &= ~(0x3F);   
    *gpfsel1 |= (0x24);      
    
-   *spi_cs &= ~(0xFFFF);     
+   *cs &= ~(0xFFFF);     
    
-   *spi_cs &= ~(0x01<<2);
-   *spi_cs &= ~(0x01<<3);    
-   *spi_cs |= (0x03<<4);     
+   *cs &= ~(0x01<<2);
+   *cs &= ~(0x01<<3);    
+   *cs |= (0x03<<4);     
  
    return 0;
 }
@@ -56,7 +56,7 @@ int smoke_release(struct inode *inode, struct file *filp){
 
    *gpfsel0 &= ~(0x1FF << 21);
    *gpfsel1 &= ~(0x3F);     
-   *spi_cs &= ~(0xFFFF);     
+   *cs &= ~(0xFFFF);     
    
    iounmap((void*)gpio_base);
    iounmap((void*)spi_base);
@@ -67,37 +67,33 @@ ssize_t smoke_read(struct file* flip, char* buf, size_t count, loff_t* f_pos){
    printk(KERN_ALERT "read function called!!\n");
    unsigned char transmit_Data[3];
    unsigned char receive_Data[3];
-   int transmit_Count = 0; 
-   int receive_Count = 0;
+   int transmit_Count = 0, receive_Count = 0, data = 0;
 
    transmit_Data[0] = 1;
    transmit_Data[1] = (0x08) << 4;
    transmit_Data[2] = 0;     
    
-   *spi_cs |= (0x03<<4);  
+   *cs |= (0x03<<4);  
    
-   *spi_cs |= (0x01<<7);     
+   *cs |= (0x01<<7);     
 
    while((transmit_Count < 3) || (receive_Count < 3)){
-      while((*spi_cs & (1<<18)) && (transmit_Count < 3)){
-         *spi_fifo = transmit_Data[transmit_Count];
+      while((*cs & (1<<18)) && (transmit_Count < 3)){
+         *fifo = transmit_Data[transmit_Count];
          transmit_Count++;
       }
-      while((*spi_cs & (1<<17)) && (receive_Count < 3)){
-         receive_Data[receive_Count] = *spi_fifo;
+      while((*cs & (1<<17)) && (receive_Count < 3)){
+         receive_Data[receive_Count] = *fifo;
          receive_Count++;
       }   
    }   
    
-   while((!(*spi_cs)) & (1<<16));
+   while((!(*cs)) & (1<<16));
    
-   *spi_cs |= (0x03<<4);   
-   *spi_cs &= ~(1<<7);     
-   
-   int data = ((receive_Data[1]&0x03)<<8) + receive_Data[2];
-   
-   printk(KERN_ALERT "reading input : %d \n", data);
+   *cs |= (0x03<<4);   
+   *cs &= ~(1<<7);     
    
+   data = ((receive_Data[1]&0x03)<<8) + receive_Data[2];
    copy_to_user(buf, &data, sizeof(int));
    
    return count;

smoke/smoke_dev.mod.c

@@ -44,4 +44,4 @@ __attribute__((section(".modinfo"))) =
 "depends=";
 
 
-MODULE_INFO(srcversion, "194BCBE501BF825F76154FB");
+MODULE_INFO(srcversion, "167423B1A2B88E719EB6620");