New style I2C driver for KXSD9 accelerometer

From: varun mahajan <invincible_6-/E1597aS9LQxFYw1CcD5bw@public.gmane.org>
To: i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org
Subject: New style I2C driver for KXSD9 accelerometer
Date: Sat, 20 Sep 2008 08:51:58 +0530 (IST)	[thread overview]
Message-ID: <20125.80062.qm@web7902.mail.in.yahoo.com> (raw)

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Hi,

I m implementing a driver for accelerometer KXSD9 in linux kernel 2.6.24.7 for OMAP-3430. KXSD9 sensor will be connected to the i2c bus so it will be an i2c client.

I m implementing a new style driver, so following are the steps that I m following:

1. Putting the device info (busnum, address, irq) in the board specific initialization code. From this the i2c-core will create a client for my device when the corresponding bus adapter (i2c_adapter) is registered.

2. I m implementing the following i2c_driver for my device

struct i2c_driver KXSD9_i2c_driver =
{
            .driver = {
                        .name = "KXSD9_driver",
            },

            .probe = KXSD9_probe, /* this will do the device initialization */
            .remove = KXSD9_remove,

            .shutdown = KXSD9_shutdown,
            .suspend = KXSD9_suspend,
            .resume = KXSD9_resume,
};

3. My requirement is that I need to export the file operations (specific ioctl commands) to the user space. I am not sure how it has to be done from this driver????

I thought of the following approach:
Registering a misc device to export the file operations

int __init KXSD9_driver_init()
{
           /*Provide /dev interface to user space and export the file   
             operations */
           misc_register(&KXSD9_misc_device);

           /*Request the IRQ and install the interrupt handler*/
           request_irq(.. KXSD9_IRQ . .);

           /*Add the i2c_driver*/
           i2c_add_driver(&KXSD9_i2c_driver);
}

Is this the correct way of doing it???????? Or the file operations should be exported using some other method in case of i2c_drivers????

Your reply will be highly helpful… Thanks in advance….

Varun

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