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// 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/input-polldev.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_polled_dev *dev)
{
const unsigned short *keycodes = dev->input->keycode;
struct clps711x_keypad_data *priv = dev->private;
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(dev->input, EV_MSC,
MSC_SCAN, code);
} else {
clear_bit(col, data->last_state);
}
if (keycodes[code])
input_report_key(dev->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(dev->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_polled_dev *poll_dev;
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;
poll_dev = input_allocate_polled_device();
if (!poll_dev)
return -ENOMEM;
poll_dev->private = priv;
poll_dev->poll = clps711x_keypad_poll;
poll_dev->poll_interval = poll_interval;
poll_dev->input->name = pdev->name;
poll_dev->input->dev.parent = dev;
poll_dev->input->id.bustype = BUS_HOST;
poll_dev->input->id.vendor = 0x0001;
poll_dev->input->id.product = 0x0001;
poll_dev->input->id.version = 0x0100;
err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
CLPS711X_KEYPAD_COL_COUNT,
NULL, poll_dev->input);
if (err)
goto out_err;
input_set_capability(poll_dev->input, EV_MSC, MSC_SCAN);
if (of_property_read_bool(np, "autorepeat"))
__set_bit(EV_REP, poll_dev->input->evbit);
platform_set_drvdata(pdev, poll_dev);
/* Set all columns to low */
regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
SYSCON1_KBDSCAN(1));
err = input_register_polled_device(poll_dev);
if (err)
goto out_err;
return 0;
out_err:
input_free_polled_device(poll_dev);
return err;
}
static int clps711x_keypad_remove(struct platform_device *pdev)
{
struct input_polled_dev *poll_dev = platform_get_drvdata(pdev);
input_unregister_polled_device(poll_dev);
input_free_polled_device(poll_dev);
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,
.remove = clps711x_keypad_remove,
};
module_platform_driver(clps711x_keypad_driver);
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
MODULE_LICENSE("GPL");
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