linux/drivers/input/joystick/psxpad-spi.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PlayStation 1/2 joypads via SPI interface Driver
 *
 * Copyright (C) 2017 Tomohiro Yoshidomi <[email protected]>
 *
 * PlayStation 1/2 joypad's plug (not socket)
 *  123 456 789
 * (...|...|...)
 *
 * 1: DAT -> MISO (pullup with 1k owm to 3.3V)
 * 2: CMD -> MOSI
 * 3: 9V (for motor, if not use N.C.)
 * 4: GND
 * 5: 3.3V
 * 6: Attention -> CS(SS)
 * 7: SCK -> SCK
 * 8: N.C.
 * 9: ACK -> N.C.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>

#define REVERSE_BIT(x) …

/* PlayStation 1/2 joypad command and response are LSBFIRST. */

/*
 *	0x01, 0x42, 0x00, 0x00, 0x00,
 *	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 *	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 */
static const u8 PSX_CMD_POLL[] = …;

#ifdef CONFIG_JOYSTICK_PSXPAD_SPI_FF
/*	0x01, 0x43, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 */
static const u8 PSX_CMD_ENTER_CFG[] = …;
/*	0x01, 0x43, 0x00, 0x00, 0x5A, 0x5A, 0x5A, 0x5A, 0x5A */
static const u8 PSX_CMD_EXIT_CFG[] = …;
/*	0x01, 0x4D, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF */
static const u8 PSX_CMD_ENABLE_MOTOR[]	= …;
#endif /* CONFIG_JOYSTICK_PSXPAD_SPI_FF */

struct psxpad { … };

static int psxpad_command(struct psxpad *pad, const u8 sendcmdlen)
{ … }

#ifdef CONFIG_JOYSTICK_PSXPAD_SPI_FF
static void psxpad_control_motor(struct psxpad *pad,
				 bool motor1enable, bool motor2enable)
{ … }

static void psxpad_set_motor_level(struct psxpad *pad,
				   u8 motor1level, u8 motor2level)
{ … }

static int psxpad_spi_play_effect(struct input_dev *idev,
				  void *data, struct ff_effect *effect)
{ … }

static int psxpad_spi_init_ff(struct psxpad *pad)
{ … }

#else	/* CONFIG_JOYSTICK_PSXPAD_SPI_FF */

static void psxpad_control_motor(struct psxpad *pad,
				 bool motor1enable, bool motor2enable)
{
}

static void psxpad_set_motor_level(struct psxpad *pad,
				   u8 motor1level, u8 motor2level)
{
}

static inline int psxpad_spi_init_ff(struct psxpad *pad)
{
	return 0;
}
#endif	/* CONFIG_JOYSTICK_PSXPAD_SPI_FF */

static int psxpad_spi_poll_open(struct input_dev *input)
{ … }

static void psxpad_spi_poll_close(struct input_dev *input)
{ … }

static void psxpad_spi_poll(struct input_dev *input)
{ … }

static int psxpad_spi_probe(struct spi_device *spi)
{ … }

static int psxpad_spi_suspend(struct device *dev)
{ … }

static DEFINE_SIMPLE_DEV_PM_OPS(psxpad_spi_pm, psxpad_spi_suspend, NULL);

static const struct spi_device_id psxpad_spi_id[] = …;
MODULE_DEVICE_TABLE(spi, psxpad_spi_id);

static struct spi_driver psxpad_spi_driver = …;

module_spi_driver(…) …;

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