mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Jingoo Han](/assets/img/avatar_default.png)
Make of_device_id array const, because all OF functions handle it as const. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
207 lines
5.2 KiB
C
207 lines
5.2 KiB
C
/*
|
|
* Cirrus Logic CLPS711X Keypad driver
|
|
*
|
|
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#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,clps711x-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_kzalloc(dev,
|
|
sizeof(*priv->gpio_data) * priv->row_count,
|
|
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);
|
|
if (!data->desc)
|
|
return -EINVAL;
|
|
|
|
if (IS_ERR(data->desc))
|
|
return PTR_ERR(data->desc);
|
|
|
|
gpiod_direction_input(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,clps711x-keypad", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
|
|
|
|
static struct platform_driver clps711x_keypad_driver = {
|
|
.driver = {
|
|
.name = "clps711x-keypad",
|
|
.owner = THIS_MODULE,
|
|
.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");
|