linux/drivers/input/joystick/adafruit-seesaw.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2023 Anshul Dalal <[email protected]>
 *
 * Driver for Adafruit Mini I2C Gamepad
 *
 * Based on the work of:
 *	Oleh Kravchenko (Sparkfun Qwiic Joystick driver)
 *
 * Datasheet: https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf
 * Product page: https://www.adafruit.com/product/5743
 * Firmware and hardware sources: https://github.com/adafruit/Adafruit_Seesaw
 *
 * TODO:
 *	- Add interrupt support
 */

#include <linux/unaligned.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/kernel.h>
#include <linux/module.h>

#define SEESAW_DEVICE_NAME …

#define SEESAW_ADC_BASE …

#define SEESAW_GPIO_DIRCLR_BULK …
#define SEESAW_GPIO_BULK …
#define SEESAW_GPIO_BULK_SET …
#define SEESAW_GPIO_PULLENSET …

#define SEESAW_STATUS_HW_ID …
#define SEESAW_STATUS_SWRST …

#define SEESAW_ADC_OFFSET …

#define SEESAW_BUTTON_A …
#define SEESAW_BUTTON_B …
#define SEESAW_BUTTON_X …
#define SEESAW_BUTTON_Y …
#define SEESAW_BUTTON_START …
#define SEESAW_BUTTON_SELECT …

#define SEESAW_ANALOG_X …
#define SEESAW_ANALOG_Y …

#define SEESAW_JOYSTICK_MAX_AXIS …
#define SEESAW_JOYSTICK_FUZZ …
#define SEESAW_JOYSTICK_FLAT …

#define SEESAW_GAMEPAD_POLL_INTERVAL_MS …
#define SEESAW_GAMEPAD_POLL_MIN …
#define SEESAW_GAMEPAD_POLL_MAX …

static const u32 SEESAW_BUTTON_MASK = …;

struct seesaw_gamepad { … };

struct seesaw_data { … };

static const struct key_entry seesaw_buttons_new[] = …;

static int seesaw_register_read(struct i2c_client *client, u16 reg, void *buf,
				int count)
{ … }

static int seesaw_register_write_u8(struct i2c_client *client, u16 reg,
				    u8 value)
{ … }

static int seesaw_register_write_u32(struct i2c_client *client, u16 reg,
				     u32 value)
{ … }

static int seesaw_read_data(struct i2c_client *client, struct seesaw_data *data)
{ … }

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

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

static int seesaw_probe(struct i2c_client *client)
{ … }

static const struct i2c_device_id seesaw_id_table[] = …;
MODULE_DEVICE_TABLE(i2c, seesaw_id_table);

static const struct of_device_id seesaw_of_table[] = …;
MODULE_DEVICE_TABLE(of, seesaw_of_table);

static struct i2c_driver seesaw_driver = …;
module_i2c_driver(…) …;

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