linux/drivers/input/joystick/walkera0701.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Parallel port to Walkera WK-0701 TX joystick
 *
 *  Copyright (c) 2008 Peter Popovec
 *
 *  More about driver:  <file:Documentation/input/devices/walkera0701.rst>
 */


#define pr_fmt(fmt) …

#define RESERVE …
#define SYNC_PULSE …
#define BIN0_PULSE …
#define BIN1_PULSE …

#define ANALOG_MIN_PULSE …
#define ANALOG_MAX_PULSE …
#define ANALOG_DELTA …

#define BIN_SAMPLE …

#define NO_SYNC …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/parport.h>
#include <linux/input.h>
#include <linux/hrtimer.h>

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;

static unsigned int walkera0701_pp_no;
module_param_named(port, walkera0701_pp_no, int, 0);
MODULE_PARM_DESC(…) …;

/*
 * For now, only one device is supported, if somebody need more devices, code
 * can be expanded, one struct walkera_dev per device must be allocated and
 * set up by walkera0701_connect (release of device by walkera0701_disconnect)
 */

struct walkera_dev { … };

static struct walkera_dev w_dev;

static inline void walkera0701_parse_frame(struct walkera_dev *w)
{ … }

static inline int read_ack(struct pardevice *p)
{ … }

/* falling edge, prepare to BIN value calculation */
static void walkera0701_irq_handler(void *handler_data)
{ … }

static enum hrtimer_restart timer_handler(struct hrtimer
					  *handle)
{ … }

static int walkera0701_open(struct input_dev *dev)
{ … }

static void walkera0701_close(struct input_dev *dev)
{ … }

static void walkera0701_attach(struct parport *pp)
{ … }

static void walkera0701_detach(struct parport *port)
{ … }

static struct parport_driver walkera0701_parport_driver = …;

module_parport_driver(…) …;