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Pin_functions.c
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Pin_functions.c
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/* Course : CSE 438 - Embedded Systems Programming
* Assignment 2 : To implement GPIO control in User Space
* Team Member1 : Samruddhi Joshi ASUID : 1213364722
* Team Member2 : Varun Joshi ASUID : 1212953337
*/
#define _GNU_SOURCE
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/msr.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h> /* required for semaphores */
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/time.h>
#include<linux/moduleparam.h>
#include <linux/gpio.h>
#include <linux/ioctl.h>
#define CONFIG _IOR('I', 1, struct User_Input)
/* ----------------------------------------------- DRIVER gmem --------------------------------------------------
Basic driver example to show skelton methods for several file operations.
----------------------------------------------------------------------------------------------------------------*/
#define DEVICE_NAME "RGBLed" // device name to be created and registered
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
struct Pin_Mapping
{
int Pin;
int Dir;
int Mux1;
int Mux1_Val;
int Mux2;
int Mux2_Val;
}GpioPin[14] = {
/* Pin Dir Mux1 Val Mux2 Val */
{11, 32, 0, 0, 0, 0}, //IO0
{12, 28, 45, 0, 0, 0}, //IO1
{13, 34, 77, 0, 0, 0}, //IO2
{14, 16, 76, 0, 64, 0}, //IO3
{ 6, 36, 0, 0, 0, 0}, //IO4
{ 0, 18, 66, 0, 0, 0}, //IO5
{ 1, 20, 68, 0, 0, 0}, //IO6
{38, 0, 0, 0, 0, 0}, //IO7
{40, 0, 0, 0, 0, 0}, //IO8
{ 4, 22, 70, 0, 0, 0}, //IO9
{10, 26, 74, 0, 0, 0}, //IO10
{ 5, 24, 44, 0, 72, 0}, //IO11
{15, 42, 0, 0, 0, 0}, //IO12
{ 7, 30, 46, 0, 0, 0} //IO13
};
static struct gpio request_gpio_arr[] =
{
{11, 0, "GPIO11"},
{32, 0, "GPIO32"},
{12, 0, "GPIO12"},
{28, 0, "GPIO28"},
{45, 0, "GPIO45"},
{13, 0, "GPIO13"},
{34, 0, "GPIO34"},
{77, 0, "GPIO77"},
{14, 0, "GPIO14"},
{16, 0, "GPIO16"},
{76, 0, "GPIO76"},
{64, 0, "GPIO64"},
{6, 0, "GPIO6"},
{36, 0, "GPIO36"},
{0, 0, "GPIO0"},
{18, 0, "GPIO18"},
{66, 0, "GPIO66"},
{1, 0, "GPIO1"},
{20, 0, "GPIO20"},
{68, 0, "GPIO68"},
{38, 0, "GPIO38"},
{40, 0, "GPIO40"},
{4, 0, "GPIO4"},
{22, 0, "GPIO22"},
{70, 0, "GPIO70"},
{10, 0, "GPIO10"},
{26, 0, "GPIO26"},
{74, 0, "GPIO74"},
{5, 0, "GPIO5"},
{24, 0, "GPIO24"},
{44, 0, "GPIO44"},
{72, 0, "GPIO72"},
{15, 0, "GPIO15"},
{42, 0, "GPIO42"},
{7, 0, "GPIO7"},
{30, 0, "GPIO30"},
{46, 0, "GPIO46"},
};
struct User_Input{
int Pin_Intensity;
int Pin_Red;
int Pin_Green;
int Pin_Blue;
}Input;
int p_r, d_r, m1_r, m2_r;
int p_g, d_g, m1_g, m2_g;
int p_b, d_b, m1_b, m2_b;
/* per device structure */
struct led_dev {
struct cdev cdev; /* The cdev structure */
char name[20]; /* Name of device*/
char in_string[256]; /* buffer for the input string */
int current_write_pointer;
//struct User_Input i
} *led_devp;
static dev_t led_dev_number; /* Allotted device number */
struct class *led_dev_class; /* Tie with the device model */
static struct device *led_dev_device;
int mux_gpio_set(unsigned int gpio, unsigned int value);
/*
* Open led driver
*/
int led_driver_open(struct inode *inode, struct file *file)
{
struct led_dev *led_devp;
// printk("\nopening\n");
/* Get the per-device structure that contains this cdev */
led_devp = container_of(inode->i_cdev, struct led_dev, cdev);
/* Easy access to cmos_devp from rest of the entry points */
file->private_data = led_devp;
printk("\n%s is openning \n", led_devp->name);
return 0;
}
/*
* Release led driver
*/
int led_driver_release(struct inode *inode, struct file *file)
{
struct led_dev *led_devp = file->private_data;
printk("\n%s is closing\n", led_devp->name);
return 0;
}
/*
* Write to led driver
*/
ssize_t led_driver_write(struct file *file, const char *buf,
size_t count, loff_t *ppos)
{
int* k_value = (int*)kmalloc(sizeof(int),GFP_KERNEL);
int* red = (int*)kmalloc(sizeof(int),GFP_KERNEL);
copy_from_user(k_value, (int *)buf, sizeof(int));
printk(KERN_DEBUG"Ready to write k is %d\n",*k_value);
printk(KERN_DEBUG"Completed write\n");
/* 0 R G B*/
*red = (0x04 & *k_value)>>2u;
*blue = (0x01 & *k_value);
*green = (0x02 & *k_value)>>1u;
printk(KERN_DEBUG"Red avlue is %d\n",*red);
gpio_set_value(p_r, (int)*red);
printk(KERN_DEBUG"value set");
gpio_set_value(p_b, blue);
gpio_set_value(p_g, green);
return 0;
}
char label1,label2,label3;
long led_driver_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
printk(KERN_DEBUG"Ready to configure");
struct User_Input* I;
I = (struct User_Input*)kmalloc(sizeof(struct User_Input),GFP_KERNEL);
switch(cmd)
{
/* TODO: Check for valid input values else return ERRNO */
case CONFIG:
printk(KERN_DEBUG"Ready to configure");
//Retrive the inputs from user space
copy_from_user(&I, (struct User_Input*) arg, sizeof(struct User_Input*));
printk(KERN_DEBUG"Copy done");
/*******************************/
/* Set the Mux for Red LED */
p_r = GpioPin[I->Pin_Red].Pin;
m1_r = GpioPin[I->Pin_Red].Mux1;
m2_r = GpioPin[I->Pin_Red].Mux2;
d_r = GpioPin[I->Pin_Red].Dir;
printk(KERN_DEBUG"p_r %d",p_r);
printk(KERN_DEBUG"m1_r %d",m1_r);
printk(KERN_DEBUG"d_r %d",d_r);
printk(KERN_DEBUG"m2_r %d",m2_r);
/*******************************/
/* Select the Mux for Green LED */
p_g = GpioPin[I->Pin_Green].Pin;
m1_g = GpioPin[I->Pin_Green].Mux1;
m2_g = GpioPin[I->Pin_Green].Mux2;
d_g = GpioPin[I->Pin_Green].Dir;
/*******************************/
/* Select the Mux for BLUE LED */
p_b = GpioPin[I->Pin_Blue].Pin;
m1_b = GpioPin[I->Pin_Blue].Mux1;
m2_b = GpioPin[I->Pin_Blue].Mux2;
d_b = GpioPin[I->Pin_Blue].Dir;
/*******************************/
printk(KERN_DEBUG"Mux settings");
//mux_gpio_set(d_r,0);
printk(KERN_DEBUG"Mux gpio input 1\n");
// gpio_request(d_r,"GPIO34");
// gpio_direction_output(d_r,0);
// //mux_gpio_set(m1_r,0);
// printk(KERN_DEBUG"Mux gpio input 2\n");
// gpio_request(m1_r,"GPIO77");
// gpio_direction_output(m1_r,0);
// //mux_gpio_set(m2_r,0);
// printk(KERN_DEBUG"Mux works\n");
// gpio_request(p_r,"GPIO13");
// gpio_direction_output(p_r, 1);
// printk(KERN_DEBUG"P_r done\n");
gpio_request_array(request_gpio_arr,ARRAY_SIZE(request_gpio_arr));
// /*********************************/
// mux_gpio_set(d_g,0);
// mux_gpio_set(m1_g,0);
// mux_gpio_set(m2_g,0);
// gpio_request(p_g,"GPIO");
// gpio_direction_output(p_g, 1);
// /*********************************/
// mux_gpio_set(d_b,0);
// mux_gpio_set(m1_b,0);
// mux_gpio_set(m2_b,0);
// gpio_request(p_b,"GPIO");
// gpio_direction_output(p_b, 1);
break;
default:
break;
}
return 0;
}
/* File operations structure. Defined in linux/fs.h */
static struct file_operations led_fops = {
.owner = THIS_MODULE, /* Owner */
.open = led_driver_open, /* Open method */
.release = led_driver_release, /* Release method */
.unlocked_ioctl = led_driver_ioctl, /* IOCTL method */
.write = led_driver_write, /* Write method */
};
/*
* Driver Initialization
*/
int __init led_driver_init(void)
{
int ret;
//int time_since_boot;
/* Request dynamic allocation of a device major number */
if (alloc_chrdev_region(&led_dev_number, 0, 1, DEVICE_NAME) < 0) {
printk(KERN_DEBUG "Can't register device\n"); return -1;
}
/* Populate sysfs entries */
led_dev_class = class_create(THIS_MODULE, DEVICE_NAME);
/* Allocate memory for the per-device structure */
led_devp = kmalloc(sizeof(struct led_dev), GFP_KERNEL);
if (!led_devp) {
printk("Bad Kmalloc\n"); return -ENOMEM;
}
/* Request I/O region */
sprintf(led_devp->name, DEVICE_NAME);
/* Connect the file operations with the cdev */
cdev_init(&led_devp->cdev, &led_fops);
led_devp->cdev.owner = THIS_MODULE;
/* Connect the major/minor number to the cdev */
ret = cdev_add(&led_devp->cdev, (led_dev_number), 1);
if (ret) {
printk("Bad cdev\n");
return ret;
}
/* Send uevents to udev, so it'll create /dev nodes */
led_dev_device = device_create(led_dev_class, NULL, MKDEV(MAJOR(led_dev_number), 0), NULL, DEVICE_NAME);
printk("led driver initialized.\n");
return 0;
}
/* Driver Exit */
void __exit led_driver_exit(void)
{
/* Release the major number */
unregister_chrdev_region((led_dev_number), 1);
/* Destroy device */
device_destroy (led_dev_class, MKDEV(MAJOR(led_dev_number), 0));
cdev_del(&led_devp->cdev);
kfree(led_devp);
/* Destroy driver_class */
class_destroy(led_dev_class);
printk("led driver removed.\n");
}
module_init(led_driver_init);
module_exit(led_driver_exit);
MODULE_LICENSE("GPL v2");
int mux_gpio_set(unsigned int gpio, unsigned int value)
{
if(gpio>0)
{
printk(KERN_DEBUG"Mux gpio input\n");
gpio_request(gpio,"GPIO");
gpio_direction_output(gpio,value);
printk(KERN_DEBUG"Mux gpio set done\n");
}
return 0;
}