buzzer & smoke detection

smoke/smoke_dev.c

+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <asm/mach/map.h>
+#include <asm/uaccess.h>
+
+#define SMOKE_MAJOR_NUMBER      500
+#define SMOKE_DEV_NAME         "/dev/smoke_dev"
+
+#define GPIO_BASE_ADDR      0x3F200000
+#define SPI_BASE_ADDR      0x3F204000
+
+#define GPFSEL0      0x00
+#define GPFSEL1      0x04
+#define SPI_CS      0x00
+#define SPI_FIFO   0x04
+
+static void __iomem *gpio_base;
+static void __iomem *spi_base;
+
+volatile unsigned int *gpfsel0, *gpfsel1;
+volatile unsigned int *spi_cs, *spi_fifo;
+
+int smoke_open(struct inode *inode, struct file *filp){
+   printk(KERN_ALERT "smoke detection sensor driver open!!\n");
+   
+   gpio_base = ioremap(GPIO_BASE_ADDR, 0xFF);
+   spi_base = ioremap(SPI_BASE_ADDR, 0xFF);
+   
+   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);
+ 
+   *gpfsel0 &= ~(0x1FF << 21);
+   *gpfsel0 |= (0x24 << 24);
+   *gpfsel1 &= ~(0x3F);   // 111111 = 0x3F
+   *gpfsel1 |= (0x24);      // 100100 = 0x24
+   
+   *spi_cs &= ~(0xFFFF);      // cs clear
+   
+   *spi_cs &= ~(0x01<<2);
+   *spi_cs &= ~(0x01<<3);      // spi(0,0)
+   *spi_cs |= (0x03<<4);      // clear FIFO
+ 
+   return 0;
+}
+   
+int smoke_release(struct inode *inode, struct file *filp){
+   printk(KERN_ALERT "smoke detection sensor driver closed!!\n");
+
+   *gpfsel0 &= ~(0x1FF << 21);
+   *gpfsel1 &= ~(0x3F);      // 111111 = 0x3F
+   *spi_cs &= ~(0xFFFF);      // cs clear
+   
+   iounmap((void*)gpio_base);
+   iounmap((void*)spi_base);
+   return 0;
+}
+
+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 spi_tData[3];
+   unsigned char spi_rData[3];
+   int tCount = 0; 
+   int rCount = 0;
+   
+   spi_tData[0] = 1;
+   spi_tData[1] = (0x08) << 4;
+   spi_tData[2] = 0;      // start single d2 d1 d0
+   
+   *spi_cs |= (0x03<<4);   // clear FIFO
+   
+   *spi_cs |= (0x01<<7);      // TA = 1
+   
+   while((tCount < 3) || (rCount < 3)){
+      while((*spi_cs & (1<<18)) && (tCount < 3)){
+         *spi_fifo = spi_tData[tCount];
+         tCount++;
+      }
+      while((*spi_cs & (1<<17)) && (rCount < 3)){
+         spi_rData[rCount] = *spi_fifo;
+         rCount++;
+      }   
+   }   
+   
+   while((!(*spi_cs)) & (1<<16));
+   
+   *spi_cs |= (0x03<<4);   // clear FIFO
+   *spi_cs &= ~(1<<7);      // TA = 0
+   
+   int data = ((spi_rData[1]&0x03)<<8) + spi_rData[2];
+   
+   printk(KERN_ALERT "reading input : %d \n", data);
+   
+   copy_to_user(buf, &data, sizeof(int));
+   
+   return count;
+}
+
+static struct file_operations smoke_fops = {
+   .owner = THIS_MODULE,
+   .open = smoke_open,
+   .release = smoke_release,
+   .read = smoke_read
+};
+
+int __init smoke_init(void){
+   if(register_chrdev(SMOKE_MAJOR_NUMBER, SMOKE_DEV_NAME, &smoke_fops) < 0)
+      printk(KERN_ALERT "smoke detection sensor initialization failed!!\n");
+   else
+      printk(KERN_ALERT "smoke detection sensor initialization success!!!\n");
+   return 0;
+}
+
+void __exit smoke_exit(void){
+   unregister_chrdev(SMOKE_MAJOR_NUMBER, SMOKE_DEV_NAME);
+   printk(KERN_ALERT "smoke detection sensor driver exit done!!!!");
+}
+
+module_init(smoke_init);
+module_exit(smoke_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("joreka");
+MODULE_DESCRIPTION("smoke_dev");
+
+   
+   
+   
+   
+   
+   
+   
+   
+   

smoke/smoke_dev.mod.c

+#include <linux/build-salt.h>
+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+BUILD_SALT;
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+MODULE_INFO(name, KBUILD_MODNAME);
+
+__visible struct module __this_module
+__attribute__((section(".gnu.linkonce.this_module"))) = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+#ifdef CONFIG_RETPOLINE
+MODULE_INFO(retpoline, "Y");
+#endif
+
+static const struct modversion_info ____versions[]
+__used
+__attribute__((section("__versions"))) = {
+	{ 0xad1a7def, "module_layout" },
+	{ 0x6bc3fbc0, "__unregister_chrdev" },
+	{ 0xcfc78319, "__register_chrdev" },
+	{ 0xdb7305a1, "__stack_chk_fail" },
+	{ 0xf4fa543b, "arm_copy_to_user" },
+	{ 0x8f678b07, "__stack_chk_guard" },
+	{ 0xedc03953, "iounmap" },
+	{ 0x2e5810c6, "__aeabi_unwind_cpp_pr1" },
+	{ 0xe97c4103, "ioremap" },
+	{ 0x7c32d0f0, "printk" },
+	{ 0xb1ad28e0, "__gnu_mcount_nc" },
+};
+
+static const char __module_depends[]
+__used
+__attribute__((section(".modinfo"))) =
+"depends=";
+
+
+MODULE_INFO(srcversion, "4EF8ECA5C9E4E3B41260072");