linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Streamzap Remote Control driver

 *

 * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>

 * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>

 *

 * This driver was based on the work of Greg Wickham and Adrian

 * Dewhurst. It was substantially rewritten to support correct signal

 * gaps and now maintains a delay buffer, which is used to present

 * consistent timing behaviour to user space applications. Without the

 * delay buffer an ugly hack would be required in lircd, which can

 * cause sluggish signal decoding in certain situations.

 *

 * Ported to in-kernel ir-core interface by Jarod Wilson

 *

 * This driver is based on the USB skeleton driver packaged with the

 * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)

 */

​

#include <linux/device.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/ktime.h>

#include <linux/usb.h>

#include <linux/usb/input.h>

#include <media/rc-core.h>

​

#define DRIVER_VERSION  "1.61"

#define DRIVER_NAME "streamzap"

#define DRIVER_DESC "Streamzap Remote Control driver"

​

#define USB_STREAMZAP_VENDOR_ID     0x0e9c

#define USB_STREAMZAP_PRODUCT_ID    0x0000

​

/* table of devices that work with this driver */

static const struct usb_device_id streamzap_table[] = {

    /* Streamzap Remote Control */

    { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },

    /* Terminating entry */

    { }

};

​

MODULE_DEVICE_TABLE(usb, streamzap_table);

​

#define SZ_PULSE_MASK 0xf0

#define SZ_SPACE_MASK 0x0f

#define SZ_TIMEOUT    0xff

#define SZ_RESOLUTION 256

​

/* number of samples buffered */

#define SZ_BUF_LEN 128

​

enum StreamzapDecoderState {

    PulseSpace,

    FullPulse,

    FullSpace,

    IgnorePulse

};

​

/* structure to hold our device specific stuff */

struct streamzap_ir {

    /* ir-core */

    struct rc_dev *rdev;

​

    /* core device info */

    struct device *dev;

​

    /* usb */

    struct usb_device   *usbdev;

    struct usb_interface    *interface;

    struct usb_endpoint_descriptor *endpoint;

    struct urb      *urb_in;

​

    /* buffer & dma */

    unsigned char       *buf_in;

    dma_addr_t      dma_in;

    unsigned int        buf_in_len;

​

    /* track what state we're in */

    enum StreamzapDecoderState decoder_state;

    /* tracks whether we are currently receiving some signal */

    bool            idle;

    /* sum of signal lengths received since signal start */

    unsigned long       sum;

    /* start time of signal; necessary for gap tracking */

    ktime_t         signal_last;

    ktime_t         signal_start;

    bool            timeout_enabled;

​

    char            name[128];

    char            phys[64];