mouse driver

mouse driver

[roshan mulla]

 hello ,
   I am trying to develop a mouse driver on linux red
hat 9 on kernel 2.4.20-8 . I am using  mouse driver
code by Alan Cox available on the web. I could
successfully compile the code .
My machine is using PS/2 mouse.i reboot the machine
with mouse removed it asks me for remove
configuration.
After this when i insmod the driver and do mknod .when
i try to open this device it gives me kernel panic
giving messages as interrupt not syncing. 
 Please can u tell me as to do i test this code . Do i
need to do some special kernel configuration for
testing this code. 
 I desperately need to test this code for my project. 
It would be very kind of u if u could help me in this
matter.
 looking forward to ur reply    
                  roshan



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mouse driver

[roshan mulla]

 hello,
    I am new to linux and i wish to write a device
driver for mouse using serial port. I have gone
through some basics for writing a module. But i want
to know if there is some special care to taken for
writing a mosue driver.
Can somebody guide me as how i should proceed about
writing a mouse driver.
               roshan








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Mouse driver

[Maikon Bueno]

Hi all...
I'm developing a serial mouse driver and I would like to know how can
I do to associate a driver with the device.
To do this driver code I followed a tutorial by Alan Cox. I used the
register_chrdev function to associate the driver with the device,
however when I issue "cat /dev/mymouse" (the mymouse device was
created using the "mknod" command with the same major number of the
driver and the module is already loaded), I got a error message.
Is there any way of to do this?
When are the open_mouse and ourmouse_interrupt functions called?

Thanks!!

#define MODULE

#include<linux/ioport.h>
#include <linux/config.h>

#include <linux/module.h>

#include<linux/sched.h>
#include<linux/poll.h>
#include<linux/interrupt.h>
#include<linux/miscdevice.h>
#include<linux/init.h>

#include <linux/kernel.h> // printk()
#include <linux/malloc.h> // kmalloc()
#include<linux/slab.h> //
#include <linux/fs.h> // everything...
#include <linux/errno.h> // error codes
#include <linux/types.h> // size_t
#include <linux/proc_fs.h>
#include <linux/fcntl.h> // O_ACCMODE
#include <linux/devfs_fs_kernel.h>
#include <linux/devfs_fs.h>

#include <asm/system.h>
#include<asm/segment.h>
#include<asm/io.h>

#ifdef CONFIG_DEVFS_FS
#include <linux/devfs_fs_kernel.h>
#else
typedef void * devfs_handle_t;
#endif

/**/

#define OURMOUSE_BASE 0x300
//#define OURMOUSE_BASE 0x23c
//#define OURMOUSE_BASE 0x064
#define OURMOUSE_MINOR 0
#define OURMOUSE_MAJOR 250
//#define MOUSE_IRQ 5
#define MOUSE_IRQ 12

static int mouse_users = 0; // User count
static int mouse_dx = 0; // Position changes
static int mouse_dy = 0;
static int mouse_event = 0; // Mouse has moved
static int mouse_buttons = 0;
static int mouse_intr = MOUSE_IRQ;

static struct wait_queue *mouse_wait;
static spinlock_t mouse_lock = SPIN_LOCK_UNLOCKED;

//Listing 1: File Operations
static ssize_t mouse_read(struct file *f, char *buffer,size_t count, loff_t
*pos);
static ssize_t write_mouse(struct file *file, const char *buffer, size_t
count, loff_t *ppos);
static unsigned int mouse_poll(struct file *file, poll_table *wait);
static int open_mouse(struct inode *inode, struct file *file);
static int close_mouse(struct inode *inode,struct file *file);

//static devfs_handle_t mydev;

struct file_operations our_mouse_fops = {
   NULL, // Mice don't seek
   mouse_read, // You can read a mouse
   write_mouse, // This won't do a lot
   NULL, // No readdir - not a directory
   mouse_poll, // Poll
   NULL, // No ioctl calls
   NULL, // No mmap
   open_mouse, // Called on open
   NULL, // Flush - 2.2 only
   close_mouse, // Called on close
   NULL, // No media change on a mouse
   NULL, // Asynchronous I/O - we will add this later
   NULL
};

static struct miscdevice our_mouse = {
OURMOUSE_MINOR, "ourmouse",&our_mouse_fops, &our_mouse_fops
};

static int ourmouse_init(void)
{
   printk("estou no ourmouse_init \n");
   if(check_region(OURMOUSE_BASE, 3))
        return -ENODEV;
   printk("ourmouse: depois do check_region(OURMOUSE_BASE,3) \n");
   request_region(OURMOUSE_BASE, 3,"ourmouse");
   register_chrdev(OURMOUSE_MAJOR,"ourmouse",&our_mouse_fops);
/*
   devfs_register(NULL,
                  "ourmouse",
                 0,
                 OURMOUSE_MAJOR,
                 OURMOUSE_MINOR,
                 S_IFCHR | S_IRUGO | S_IWUGO,
                 &our_mouse_fops,
                 0);
 */
   //misc_register(&our_mouse);
   return 0;
}

int init_module(void)
{
   printk("estou no init_module \n");
   if(ourmouse_init()<0)
         return -ENODEV;
   printk("init_module: depois de ourmouse_init() \n");
   return 0;
}

void cleanup_module(void)
{
   //misc_deregister(&our_mouse);
   //deffs_unregister(mydev);
   unregister_chrdev(OURMOUSE_MAJOR,"ourmouse");
   release_region(OURMOUSE_BASE, 3);
}

static void ourmouse_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
   char delta_x;
   char delta_y;
   unsigned char new_buttons;

   printk("uma interrupcao foi chamada \n");

   delta_x = inb(OURMOUSE_BASE);
   delta_y = inb(OURMOUSE_BASE+1);
   new_buttons = inb(OURMOUSE_BASE+2);

   if(delta_x || delta_y || new_buttons != mouse_buttons)
   {
           // Something happened
           spin_lock(&mouse_lock);
           mouse_event = 1;
           mouse_dx += delta_x;
           mouse_dy += delta_y;
           mouse_buttons = new_buttons;
           spin_unlock(&mouse_lock);

           wake_up_interruptible(&mouse_wait);
   }
}

static int open_mouse(struct inode *inode, struct file *file)
{
   printk("estou no open_mouse \n");

   if(mouse_users++)
       return 0;
   if(request_irq(mouse_intr, ourmouse_interrupt, 0,
      "ourmouse", NULL))
   {
       printk("request_irq: dentro do IF... algo deu errado \n");
       mouse_users--;
       return -EBUSY;
   }
   mouse_dx = 0;
   mouse_dy = 0;
   mouse_buttons = 0;
   mouse_event = 0;
   MOD_INC_USE_COUNT;
   return 0;
}

static int close_mouse(struct inode *inode,struct file *file)
{
   if(--mouse_users)
           return 0;
   free_irq(mouse_intr, NULL);
   MOD_DEC_USE_COUNT;
   return 0;
}

static ssize_t write_mouse(struct file *file, const char *buffer, size_t
count, loff_t *ppos)
{
   return -EINVAL;
}

static unsigned int mouse_poll(struct file *file, poll_table *wait)
{
   poll_wait(file, &mouse_wait, wait);
   if(mouse_event)
           return POLLIN | POLLRDNORM;
   return 0;
}

static ssize_t mouse_read(struct file *f, char *buffer,size_t count, loff_t
*pos)
{
   int dx, dy;
   unsigned char button;
   unsigned long flags;
   int n;

   if(count < 3)
       return -EINVAL;

//Wait for an event
//struct task_struct *current;
while(!mouse_event)
{
   if(f->f_flags&O_NDELAY)
   return -EAGAIN;
   interruptible_sleep_on(&mouse_wait);
   if(signal_pending(current))
   return -ERESTARTSYS;
}

//Reading the Event
// mouse_read continued
// Grab the event
spin_lock_irqsave(&mouse_lock, flags);

dx = mouse_dx;
dy = mouse_dy;
button = mouse_buttons;

if(dx<=-127)
       dx=-127;
if(dx>=127)
       dx=127;
if(dy<=-127)
       dy=-127;
if(dy>=127)
       dy=127;

mouse_dx -= dx;
mouse_dy -= dy;

if (mouse_dx == 0 && mouse_dy == 0)
       mouse_event = 0;

spin_unlock_irqrestore(&mouse_lock, flags);

//=================================================
//Copying Results to the Buffer
// mouse_read continued

if(put_user(button|0x80, buffer))
       return -EFAULT;
if(put_user((char)dx, buffer+1))
       return -EFAULT;
if(put_user((char)dy, buffer+2))
       return -EFAULT;

for(n=3; n < count; n++)
       if(put_user(0x00, buffer+n))
               return -EFAULT;

return count;
}
/**/

Re: Mouse driver

[Vojtech Pavlik]

On Tue, Jul 13, 2004 at 04:10:09PM -0300, Maikon Bueno wrote:
> Hi all...
> I'm developing a serial mouse driver and I would like to know how can
> I do to associate a driver with the device.
> To do this driver code I followed a tutorial by Alan Cox. I used the
> register_chrdev function to associate the driver with the device,
> however when I issue "cat /dev/mymouse" (the mymouse device was
> created using the "mknod" command with the same major number of the
> driver and the module is already loaded), I got a error message.
> Is there any way of to do this?
> When are the open_mouse and ourmouse_interrupt functions called?
> 
> Thanks!!

I think you should take a look at
	
	Documentation/input/input-programming.txt

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR

Mouse driver

[Ronit Halder]

Hi,I want to write mouse driver for linux ( usb mouse). I am reading
"Linux device driver" and "Linux kernel development". But i don't how
to start writing the driver.
So,Please help.

Best regards,
Ronit.

Mouse driver

[nick]

Ronit,
What are your reasons for writing this driver? In addition if you have 
the kernel tree lying around look under drivers/input/mouse for mouse
drivers that are in production to help you understand how to write
one better.
Good Luck,
Nick 

On 2015-03-06 11:27 PM, Ronit Halder wrote:
> Hi,I want to write mouse driver for linux ( usb mouse). I am reading
> "Linux device driver" and "Linux kernel development". But i don't how
> to start writing the driver.
> So,Please help.
> 
> Best regards,
> Ronit.
> 
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> 

Mouse driver

[nick]

On 2015-03-06 11:36 PM, Ronit Halder wrote:
> This is my semester project and Thanks.
> 
Does it have to be a input driver? If you really want to impress your teacher and
get a better mark,try writing a basic network or usb driver.
Nick

> On Sat, Mar 7, 2015 at 10:04 AM, nick <xerofoify@gmail.com> wrote:
>> Ronit,
>> What are your reasons for writing this driver? In addition if you have
>> the kernel tree lying around look under drivers/input/mouse for mouse
>> drivers that are in production to help you understand how to write
>> one better.
>> Good Luck,
>> Nick
>>
>> On 2015-03-06 11:27 PM, Ronit Halder wrote:
>>> Hi,I want to write mouse driver for linux ( usb mouse). I am reading
>>> "Linux device driver" and "Linux kernel development". But i don't how
>>> to start writing the driver.
>>> So,Please help.
>>>
>>> Best regards,
>>> Ronit.
>>>
>>> _______________________________________________
>>> Kernelnewbies mailing list
>>> Kernelnewbies at kernelnewbies.org
>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>

Mouse driver

[Maxime Ripard]

Nick,

On Fri, Mar 06, 2015 at 11:39:21PM -0500, nick wrote:
> On 2015-03-06 11:36 PM, Ronit Halder wrote:
> > This is my semester project and Thanks.
>
> Does it have to be a input driver? If you really want to impress
> your teacher and get a better mark,try writing a basic network or
> usb driver.

Except that an USB or at networking driver is a few orders of
magnitude more difficult than an input driver.

While it would certainly be a wonderful achievement, it really is not
reasonable to suggest that on this list.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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Mouse driver

[Nicholas Krause]

On March 8, 2015 5:51:58 PM EDT, Maxime Ripard <maxime.ripard@free-electrons.com> wrote:
>Nick,
>
>On Fri, Mar 06, 2015 at 11:39:21PM -0500, nick wrote:
>> On 2015-03-06 11:36 PM, Ronit Halder wrote:
>> > This is my semester project and Thanks.
>>
>> Does it have to be a input driver? If you really want to impress
>> your teacher and get a better mark,try writing a basic network or
>> usb driver.
>
>Except that an USB or at networking driver is a few orders of
>magnitude more difficult than an input driver.
>
>While it would certainly be a wonderful achievement, it really is not
>reasonable to suggest that on this list.
>
>Maxime
It was only a suggestion.  I didn't realize that was impolite on the list. I was seeing if I could help him get a better mark as sometimes in my experience they get bonus marks for writing more difficult programs in this case,  more complex drivers. 
Sorry, 
Nick
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Mouse driver

[Ronit Halder]

How to get the interrupt number for any device.

On Mon, Mar 9, 2015 at 3:39 AM, Nicholas Krause <xerofoify@gmail.com> wrote:

>
>
> On March 8, 2015 5:51:58 PM EDT, Maxime Ripard <
> maxime.ripard at free-electrons.com> wrote:
> >Nick,
> >
> >On Fri, Mar 06, 2015 at 11:39:21PM -0500, nick wrote:
> >> On 2015-03-06 11:36 PM, Ronit Halder wrote:
> >> > This is my semester project and Thanks.
> >>
> >> Does it have to be a input driver? If you really want to impress
> >> your teacher and get a better mark,try writing a basic network or
> >> usb driver.
> >
> >Except that an USB or at networking driver is a few orders of
> >magnitude more difficult than an input driver.
> >
> >While it would certainly be a wonderful achievement, it really is not
> >reasonable to suggest that on this list.
> >
> >Maxime
> It was only a suggestion.  I didn't realize that was impolite on the list.
> I was seeing if I could help him get a better mark as sometimes in my
> experience they get bonus marks for writing more difficult programs in this
> case,  more complex drivers.
> Sorry,
> Nick
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>
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Mouse driver

[Nicholas Krause]

On March 8, 2015 9:12:28 PM EDT, Ronit Halder <ronit.linux@gmail.com> wrote:
>How to get the interrupt number for any device.
The easiest way is to take a look for your device's id in lsusb and see if the interrupt number is there for your device. 
Nick
>
>On Mon, Mar 9, 2015 at 3:39 AM, Nicholas Krause <xerofoify@gmail.com>
>wrote:
>
>>
>>
>> On March 8, 2015 5:51:58 PM EDT, Maxime Ripard <
>> maxime.ripard at free-electrons.com> wrote:
>> >Nick,
>> >
>> >On Fri, Mar 06, 2015 at 11:39:21PM -0500, nick wrote:
>> >> On 2015-03-06 11:36 PM, Ronit Halder wrote:
>> >> > This is my semester project and Thanks.
>> >>
>> >> Does it have to be a input driver? If you really want to impress
>> >> your teacher and get a better mark,try writing a basic network or
>> >> usb driver.
>> >
>> >Except that an USB or at networking driver is a few orders of
>> >magnitude more difficult than an input driver.
>> >
>> >While it would certainly be a wonderful achievement, it really is
>not
>> >reasonable to suggest that on this list.
>> >
>> >Maxime
>> It was only a suggestion.  I didn't realize that was impolite on the
>list.
>> I was seeing if I could help him get a better mark as sometimes in my
>> experience they get bonus marks for writing more difficult programs
>in this
>> case,  more complex drivers.
>> Sorry,
>> Nick
>> --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>>

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.