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Altera_Forum's avatar
Altera_Forum
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12 years ago

Getting data from a rtc device through I2C

Hi all, I would like to retrieve information from a RTC device which is directly connected to a GPIO, using the i2c protocol. So, the first step was to load the i2c-gpio driver with this piece ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Hi,

Maybe you need the function 'i2c_put_adapter' like 


static int __init i2c_gpio_bus_init(void)
{
    int ret;
    struct i2c_adapter *bus;
    struct i2c_client *rtc;
    ret = platform_device_register(&i2c_gpio_bus_rtc);
    if (ret)
        printk(KERN_ERR "i2c_bus_driver: Error when registering: %d\n", 
        ret);
    /* Populate bus */
    bus = i2c_get_adapter(0);
    rtc = i2c_new_device(bus, i2c_gpio_bus_devices);
    i2c_put_adapter(bus);    // <--- here
    if (rtc == NULL)
        printk(KERN_ERR "i2c_bus_driver: no device added to %s bus\n",
        bus->name);
    
    return ret;
}

Kazu