Source of i2c-smbus.c - linux-imx - PHYTEC BitBucket (Stash)

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
​
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
​
struct i2c_smbus_alert {
    struct work_struct  alert;
    struct i2c_client   *ara;       /* Alert response address */
};
​
struct alert_data {
    unsigned short      addr;
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    struct i2c_smbus_alert_setup *setup = dev_get_platdata(&ara->dev);
    struct i2c_smbus_alert *alert;
    struct i2c_adapter *adapter = ara->adapter;
    int res, irq;
​
    alert = devm_kzalloc(&ara->dev, sizeof(struct i2c_smbus_alert),
                 GFP_KERNEL);
    if (!alert)
        return -ENOMEM;
​
    irq = setup->irq;
    if (setup) {
        irq = setup->irq;
    } else {
        irq = of_irq_get_byname(adapter->dev.of_node, "smbus_alert");
        if (irq <= 0)
            return irq;
    }
​
    INIT_WORK(&alert->alert, smbalert_work);
    alert->ara = ara;
​
    if (irq > 0) {
        res = devm_request_threaded_irq(&ara->dev, irq,
                        NULL, smbus_alert,
                        IRQF_SHARED | IRQF_ONESHOT,
                        "smbus_alert", alert);
        if (res)
            return res;