linux-imx

/*

 * Loopback driver for rc-core,

 *

 * Copyright (c) 2010 David Härdeman <david@hardeman.nu>

 *

 * This driver receives TX data and passes it back as RX data,

 * which is useful for (scripted) debugging of rc-core without

 * having to use actual hardware.

 *

 * 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.

 *

 */

​

#include <linux/device.h>

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <media/rc-core.h>

​

#define DRIVER_NAME "rc-loopback"

#define dprintk(x...)   if (debug) printk(KERN_INFO DRIVER_NAME ": " x)

#define RXMASK_REGULAR  0x1

#define RXMASK_LEARNING 0x2

​

static bool debug;

​

struct loopback_dev {

    struct rc_dev *dev;

    u32 txmask;

    u32 txcarrier;

    u32 txduty;

    bool idle;

    bool learning;

    bool carrierreport;

    u32 rxcarriermin;

    u32 rxcarriermax;

};

​

static struct loopback_dev loopdev;

​

static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)

{

    struct loopback_dev *lodev = dev->priv;

​

    if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) {

        dprintk("invalid tx mask: %u\n", mask);

        return -EINVAL;

    }

​

    dprintk("setting tx mask: %u\n", mask);

    lodev->txmask = mask;

    return 0;

}

​

static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)