linux/drivers/input/keyboard/imx_keypad.c

// SPDX-License-Identifier: GPL-2.0
//
// Driver for the IMX keypad port.
// Copyright (C) 2009 Alberto Panizzo <[email protected]>

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/timer.h>

/*
 * Keypad Controller registers (halfword)
 */
#define KPCR …

#define KPSR …
#define KBD_STAT_KPKD …
#define KBD_STAT_KPKR …
#define KBD_STAT_KDSC …
#define KBD_STAT_KRSS …
#define KBD_STAT_KDIE …
#define KBD_STAT_KRIE …
#define KBD_STAT_KPPEN …

#define KDDR …
#define KPDR …

#define MAX_MATRIX_KEY_ROWS …
#define MAX_MATRIX_KEY_COLS …
#define MATRIX_ROW_SHIFT …

#define MAX_MATRIX_KEY_NUM …

struct imx_keypad { … };

/* Scan the matrix and return the new state in *matrix_volatile_state. */
static void imx_keypad_scan_matrix(struct imx_keypad *keypad,
				  unsigned short *matrix_volatile_state)
{ … }

/*
 * Compare the new matrix state (volatile) with the stable one stored in
 * keypad->matrix_stable_state and fire events if changes are detected.
 */
static void imx_keypad_fire_events(struct imx_keypad *keypad,
				   unsigned short *matrix_volatile_state)
{ … }

/*
 * imx_keypad_check_for_events is the timer handler.
 */
static void imx_keypad_check_for_events(struct timer_list *t)
{ … }

static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id)
{ … }

static void imx_keypad_config(struct imx_keypad *keypad)
{ … }

static void imx_keypad_inhibit(struct imx_keypad *keypad)
{ … }

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

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

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

static int imx_keypad_probe(struct platform_device *pdev)
{ … }

static int __maybe_unused imx_kbd_noirq_suspend(struct device *dev)
{ … }

static int __maybe_unused imx_kbd_noirq_resume(struct device *dev)
{ … }

static const struct dev_pm_ops imx_kbd_pm_ops = …;

static struct platform_driver imx_keypad_driver = …;
module_platform_driver(…) …;

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