root/include/media/v4l2-i2c-drv-legacy.h

DEFINITIONS

1. v4l2_i2c_drv_attach_legacy
2. v4l2_i2c_drv_probe_legacy
3. v4l2_i2c_drv_detach_legacy
4. v4l2_i2c_drv_suspend_helper
5. v4l2_i2c_drv_resume_helper
6. v4l2_i2c_drv_init
7. v4l2_i2c_drv_cleanup

/*
 * v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical
 *                  for all V4L2 I2C drivers. Use this header if the
 *                  I2C driver is used by both legacy drivers and
 *                  drivers converted to the bus-based I2C API.
 *
 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

struct v4l2_i2c_driver_data {
        const char * const name;
        int driverid;
        int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
        int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
        int (*remove)(struct i2c_client *client);
        int (*suspend)(struct i2c_client *client, pm_message_t state);
        int (*resume)(struct i2c_client *client);
        int (*legacy_probe)(struct i2c_adapter *adapter);
        int legacy_class;
        const struct i2c_device_id *id_table;
};

static struct v4l2_i2c_driver_data v4l2_i2c_data;
static const struct i2c_client_address_data addr_data;
static struct i2c_driver v4l2_i2c_driver_legacy;
static char v4l2_i2c_drv_name_legacy[32];

static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind)
{
        return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy,
                        v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe);
}

static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter)
{
        if (v4l2_i2c_data.legacy_probe) {
                if (v4l2_i2c_data.legacy_probe(adapter))
                        return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
                return 0;
        }
        if (adapter->class & v4l2_i2c_data.legacy_class)
                return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
        return 0;
}

static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client)
{
        int err;

        if (v4l2_i2c_data.remove)
                v4l2_i2c_data.remove(client);

        err = i2c_detach_client(client);
        if (err)
                return err;
        kfree(client);
        return 0;
}

static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state)
{
        return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0;
}

static int v4l2_i2c_drv_resume_helper(struct i2c_client *client)
{
        return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0;
}

/* ----------------------------------------------------------------------- */

/* i2c implementation */
static struct i2c_driver v4l2_i2c_driver_legacy = {
        .driver = {
                .owner = THIS_MODULE,
        },
        .attach_adapter = v4l2_i2c_drv_probe_legacy,
        .detach_client = v4l2_i2c_drv_detach_legacy,
        .suspend = v4l2_i2c_drv_suspend_helper,
        .resume  = v4l2_i2c_drv_resume_helper,
};

/* ----------------------------------------------------------------------- */

/* i2c implementation */
static struct i2c_driver v4l2_i2c_driver = {
        .suspend        = v4l2_i2c_drv_suspend_helper,
        .resume         = v4l2_i2c_drv_resume_helper,
};

static int __init v4l2_i2c_drv_init(void)
{
        int err;

        strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy));
        strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy));

        if (v4l2_i2c_data.legacy_class == 0)
                v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG;

        v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy;
        v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid;
        v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command;
        err = i2c_add_driver(&v4l2_i2c_driver_legacy);

        if (err)
                return err;
        v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
        v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
        v4l2_i2c_driver.command = v4l2_i2c_data.command;
        v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
        v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
        v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table;
        err = i2c_add_driver(&v4l2_i2c_driver);
        if (err)
                i2c_del_driver(&v4l2_i2c_driver_legacy);
        return err;
}

static void __exit v4l2_i2c_drv_cleanup(void)
{
        i2c_del_driver(&v4l2_i2c_driver_legacy);
        i2c_del_driver(&v4l2_i2c_driver);
}

module_init(v4l2_i2c_drv_init);
module_exit(v4l2_i2c_drv_cleanup);