Input: add new driver for ARM CLPS711X keypad

This patch adds a new driver for keypad for Cirrus Logic CLPS711X CPUs.
Target CPU contain keyboard interface which can scan 8 column lines,
so we can read row GPIOs to read status and determine asserted state.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Alexander Shiyan 2014-03-28 09:37:14 -07:00 committed by Dmitry Torokhov
parent fd335ab04b
commit e70f18e1c7
4 changed files with 247 additions and 0 deletions

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@ -0,0 +1,27 @@
* Cirrus Logic CLPS711X matrix keypad device tree bindings
Required Properties:
- compatible: Shall contain "cirrus,clps711x-keypad".
- row-gpios: List of GPIOs used as row lines.
- poll-interval: Poll interval time in milliseconds.
- linux,keymap: The definition can be found at
bindings/input/matrix-keymap.txt.
Optional Properties:
- autorepeat: Enable autorepeat feature.
Example:
keypad {
compatible = "cirrus,ep7312-keypad", "cirrus,clps711x-keypad";
autorepeat;
poll-interval = <120>;
row-gpios = <&porta 0 0>,
<&porta 1 0>;
linux,keymap = <
MATRIX_KEY(0, 0, KEY_UP)
MATRIX_KEY(0, 1, KEY_DOWN)
MATRIX_KEY(1, 0, KEY_LEFT)
MATRIX_KEY(1, 1, KEY_RIGHT)
>;
};

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@ -151,6 +151,18 @@ config KEYBOARD_BFIN
To compile this driver as a module, choose M here: the
module will be called bf54x-keys.
config KEYBOARD_CLPS711X
tristate "CLPS711X Keypad support"
depends on OF_GPIO && (ARCH_CLPS711X || COMPILE_TEST)
select INPUT_MATRIXKMAP
select INPUT_POLLDEV
help
Say Y here to enable the matrix keypad on the Cirrus Logic
CLPS711X CPUs.
To compile this driver as a module, choose M here: the
module will be called clps711x-keypad.
config KEYBOARD_LKKBD
tristate "DECstation/VAXstation LK201/LK401 keyboard"
select SERIO

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@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_AMIGA) += amikbd.o
obj-$(CONFIG_KEYBOARD_ATARI) += atakbd.o
obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
obj-$(CONFIG_KEYBOARD_CLPS711X) += clps711x-keypad.o
obj-$(CONFIG_KEYBOARD_CROS_EC) += cros_ec_keyb.o
obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o

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@ -0,0 +1,207 @@
/*
* 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 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");