linux-imx

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

/*

 * serial_ir.c

 *

 * serial_ir - Device driver that records pulse- and pause-lengths

 *         (space-lengths) between DDCD event on a serial port.

 *

 * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>

 * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>

 * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>

 * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>

 * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)

 * Copyright (C) 2016 Sean Young <sean@mess.org> (port to rc-core)

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/serial_reg.h>

#include <linux/types.h>

#include <linux/delay.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <media/rc-core.h>

​

struct serial_ir_hw {

    int signal_pin;

    int signal_pin_change;

    u8 on;

    u8 off;

    unsigned set_send_carrier:1;

    unsigned set_duty_cycle:1;

    void (*send_pulse)(unsigned int length, ktime_t edge);

    void (*send_space)(void);

    spinlock_t lock;

};

​

#define IR_HOMEBREW 0

#define IR_IRDEO    1

#define IR_IRDEO_REMOTE 2

#define IR_ANIMAX   3

#define IR_IGOR     4

​

/* module parameters */

static int type;

static int io;

static int irq;

static ulong iommap;

static int ioshift;

static bool softcarrier = true;

static bool share_irq;

static int sense = -1;  /* -1 = auto, 0 = active high, 1 = active low */

static bool txsense;    /* 0 = active high, 1 = active low */

​

/* forward declarations */

static void send_pulse_irdeo(unsigned int length, ktime_t edge);

static void send_space_irdeo(void);

#ifdef CONFIG_IR_SERIAL_TRANSMITTER

static void send_pulse_homebrew(unsigned int length, ktime_t edge);

static void send_space_homebrew(void);