Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cirrus Logic CLPS711X Keypad driver
 *
 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
 */
 
#include <linux/input.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/input/matrix_keypad.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/clps711x.h>
 
#define CLPS711X_KEYPAD_COL_COUNT	8
 
struct clps711x_gpio_data {
<------>struct gpio_desc *desc;
<------>DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
};
 
struct clps711x_keypad_data {
<------>struct regmap			*syscon;
<------>int				row_count;
<------>unsigned int			row_shift;
<------>struct clps711x_gpio_data	*gpio_data;
};
 
static void clps711x_keypad_poll(struct input_dev *input)
{
<------>const unsigned short *keycodes = input->keycode;
<------>struct clps711x_keypad_data *priv = input_get_drvdata(input);
<------>bool sync = false;
<------>int col, row;
 
<------>for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
<------><------>/* Assert column */
<------><------>regmap_update_bits(priv->syscon, SYSCON_OFFSET,
<------><------><------><------>   SYSCON1_KBDSCAN_MASK,
<------><------><------><------>   SYSCON1_KBDSCAN(8 + col));
 
<------><------>/* Scan rows */
<------><------>for (row = 0; row < priv->row_count; row++) {
<------><------><------>struct clps711x_gpio_data *data = &priv->gpio_data[row];
<------><------><------>bool state, state1;
 
<------><------><------>/* Read twice for protection against fluctuations */
<------><------><------>do {
<------><------><------><------>state = gpiod_get_value_cansleep(data->desc);
<------><------><------><------>cond_resched();
<------><------><------><------>state1 = gpiod_get_value_cansleep(data->desc);
<------><------><------>} while (state != state1);
 
<------><------><------>if (test_bit(col, data->last_state) != state) {
<------><------><------><------>int code = MATRIX_SCAN_CODE(row, col,
<------><------><------><------><------><------><------>    priv->row_shift);
 
<------><------><------><------>if (state) {
<------><------><------><------><------>set_bit(col, data->last_state);
<------><------><------><------><------>input_event(input,
<------><------><------><------><------><------>    EV_MSC, MSC_SCAN, code);
<------><------><------><------>} else {
<------><------><------><------><------>clear_bit(col, data->last_state);
<------><------><------><------>}
 
<------><------><------><------>if (keycodes[code])
<------><------><------><------><------>input_report_key(input,
<------><------><------><------><------><------><------> keycodes[code], state);
<------><------><------><------>sync = true;
<------><------><------>}
<------><------>}
 
<------><------>/* Set all columns to low */
<------><------>regmap_update_bits(priv->syscon, SYSCON_OFFSET,
<------><------><------><------>   SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
<------>}
 
<------>if (sync)
<------><------>input_sync(input);
}
 
static int clps711x_keypad_probe(struct platform_device *pdev)
{
<------>struct clps711x_keypad_data *priv;
<------>struct device *dev = &pdev->dev;
<------>struct device_node *np = dev->of_node;
<------>struct input_dev *input;
<------>u32 poll_interval;
<------>int i, err;
 
<------>priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
<------>if (!priv)
<------><------>return -ENOMEM;
 
<------>priv->syscon =
<------><------>syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon1");
<------>if (IS_ERR(priv->syscon))
<------><------>return PTR_ERR(priv->syscon);
 
<------>priv->row_count = of_gpio_named_count(np, "row-gpios");
<------>if (priv->row_count < 1)
<------><------>return -EINVAL;
 
<------>priv->gpio_data = devm_kcalloc(dev,
<------><------><------><------>priv->row_count, sizeof(*priv->gpio_data),
<------><------><------><------>GFP_KERNEL);
<------>if (!priv->gpio_data)
<------><------>return -ENOMEM;
 
<------>priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
 
<------>for (i = 0; i < priv->row_count; i++) {
<------><------>struct clps711x_gpio_data *data = &priv->gpio_data[i];
 
<------><------>data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
<------><------>if (IS_ERR(data->desc))
<------><------><------>return PTR_ERR(data->desc);
<------>}
 
<------>err = of_property_read_u32(np, "poll-interval", &poll_interval);
<------>if (err)
<------><------>return err;
 
<------>input = devm_input_allocate_device(dev);
<------>if (!input)
<------><------>return -ENOMEM;
 
<------>input_set_drvdata(input, priv);
 
<------>input->name		= pdev->name;
<------>input->dev.parent	= dev;
<------>input->id.bustype	= BUS_HOST;
<------>input->id.vendor	= 0x0001;
<------>input->id.product	= 0x0001;
<------>input->id.version	= 0x0100;
 
<------>err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
<------><------><------><------><------> CLPS711X_KEYPAD_COL_COUNT,
<------><------><------><------><------> NULL, input);
<------>if (err)
<------><------>return err;
 
<------>input_set_capability(input, EV_MSC, MSC_SCAN);
<------>if (of_property_read_bool(np, "autorepeat"))
<------><------>__set_bit(EV_REP, input->evbit);
 
<------>/* Set all columns to low */
<------>regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
<------><------><------>   SYSCON1_KBDSCAN(1));
 
 
<------>err = input_setup_polling(input, clps711x_keypad_poll);
<------>if (err)
<------><------>return err;
 
<------>input_set_poll_interval(input, poll_interval);
 
<------>err = input_register_device(input);
<------>if (err)
<------><------>return err;
 
<------>return 0;
}
 
static const struct of_device_id clps711x_keypad_of_match[] = {
<------>{ .compatible = "cirrus,ep7209-keypad", },
<------>{ }
};
MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
 
static struct platform_driver clps711x_keypad_driver = {
<------>.driver	= {
<------><------>.name		= "clps711x-keypad",
<------><------>.of_match_table	= clps711x_keypad_of_match,
<------>},
<------>.probe	= clps711x_keypad_probe,
};
module_platform_driver(clps711x_keypad_driver);
 
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
MODULE_LICENSE("GPL");