hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
linux-sg2042/drivers/input/keyboard/ep93xx_keypad.c

331 lines
8.1 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Cirrus EP93xx matrix keypad controller.
*
* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
*
* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
*
* NOTE:
*
* The 3-key reset is triggered by pressing the 3 keys in
* Row 0, Columns 2, 4, and 7 at the same time. This action can
* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
*
* Normal operation for the matrix does not autorepeat the key press.
* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
* flag.
*/
#include <linux/bits.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
#include <linux/soc/cirrus/ep93xx.h>
#include <linux/platform_data/keypad-ep93xx.h>
#include <linux/pm_wakeirq.h>
/*
* Keypad Interface Register offsets
*/
#define KEY_INIT 0x00 /* Key Scan Initialization register */
#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
#define KEY_REG 0x08 /* Key Value Capture register */
/* Key Scan Initialization Register bit defines */
#define KEY_INIT_DBNC_MASK GENMASK(23, 16)
#define KEY_INIT_DBNC_SHIFT 16
#define KEY_INIT_DIS3KY BIT(15)
#define KEY_INIT_DIAG BIT(14)
#define KEY_INIT_BACK BIT(13)
#define KEY_INIT_T2 BIT(12)
#define KEY_INIT_PRSCL_MASK GENMASK(9, 0)
#define KEY_INIT_PRSCL_SHIFT 0
/* Key Scan Diagnostic Register bit defines */
#define KEY_DIAG_MASK GENMASK(5, 0)
#define KEY_DIAG_SHIFT 0
/* Key Value Capture Register bit defines */
#define KEY_REG_K BIT(15)
#define KEY_REG_INT BIT(14)
#define KEY_REG_2KEYS BIT(13)
#define KEY_REG_1KEY BIT(12)
#define KEY_REG_KEY2_MASK GENMASK(11, 6)
#define KEY_REG_KEY2_SHIFT 6
#define KEY_REG_KEY1_MASK GENMASK(5, 0)
#define KEY_REG_KEY1_SHIFT 0
#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
struct ep93xx_keypad {
struct ep93xx_keypad_platform_data *pdata;
struct input_dev *input_dev;
struct clk *clk;
void __iomem *mmio_base;
unsigned short keycodes[EP93XX_MATRIX_SIZE];
int key1;
int key2;
int irq;
bool enabled;
};
static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
{
struct ep93xx_keypad *keypad = dev_id;
struct input_dev *input_dev = keypad->input_dev;
unsigned int status;
int keycode, key1, key2;
status = __raw_readl(keypad->mmio_base + KEY_REG);
keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
key1 = keypad->keycodes[keycode];
keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
key2 = keypad->keycodes[keycode];
if (status & KEY_REG_2KEYS) {
if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
input_report_key(input_dev, keypad->key1, 0);
if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
input_report_key(input_dev, keypad->key2, 0);
input_report_key(input_dev, key1, 1);
input_report_key(input_dev, key2, 1);
keypad->key1 = key1;
keypad->key2 = key2;
} else if (status & KEY_REG_1KEY) {
if (keypad->key1 && key1 != keypad->key1)
input_report_key(input_dev, keypad->key1, 0);
if (keypad->key2 && key1 != keypad->key2)
input_report_key(input_dev, keypad->key2, 0);
input_report_key(input_dev, key1, 1);
keypad->key1 = key1;
keypad->key2 = 0;
} else {
input_report_key(input_dev, keypad->key1, 0);
input_report_key(input_dev, keypad->key2, 0);
keypad->key1 = keypad->key2 = 0;
}
input_sync(input_dev);
return IRQ_HANDLED;
}
static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
{
struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
unsigned int val = 0;
clk_set_rate(keypad->clk, pdata->clk_rate);
if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
val |= KEY_INIT_DIS3KY;
if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
val |= KEY_INIT_DIAG;
if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
val |= KEY_INIT_BACK;
if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
val |= KEY_INIT_T2;
val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
__raw_writel(val, keypad->mmio_base + KEY_INIT);
}
static int ep93xx_keypad_open(struct input_dev *pdev)
{
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
if (!keypad->enabled) {
ep93xx_keypad_config(keypad);
clk_prepare_enable(keypad->clk);
keypad->enabled = true;
}
return 0;
}
static void ep93xx_keypad_close(struct input_dev *pdev)
{
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
if (keypad->enabled) {
clk_disable_unprepare(keypad->clk);
keypad->enabled = false;
}
}
static int __maybe_unused ep93xx_keypad_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;
mutex_lock(&input_dev->mutex);
if (keypad->enabled) {
clk_disable(keypad->clk);
keypad->enabled = false;
}
mutex_unlock(&input_dev->mutex);
return 0;
}
static int __maybe_unused ep93xx_keypad_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;
mutex_lock(&input_dev->mutex);
if (input_device_enabled(input_dev)) {
if (!keypad->enabled) {
ep93xx_keypad_config(keypad);
clk_enable(keypad->clk);
keypad->enabled = true;
}
}
mutex_unlock(&input_dev->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
ep93xx_keypad_suspend, ep93xx_keypad_resume);
static void ep93xx_keypad_release_gpio_action(void *_pdev)
{
struct platform_device *pdev = _pdev;
ep93xx_keypad_release_gpio(pdev);
}
static int ep93xx_keypad_probe(struct platform_device *pdev)
{
struct ep93xx_keypad *keypad;
const struct matrix_keymap_data *keymap_data;
struct input_dev *input_dev;
int err;
keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
if (!keypad)
return -ENOMEM;
keypad->pdata = dev_get_platdata(&pdev->dev);
if (!keypad->pdata)
return -EINVAL;
keymap_data = keypad->pdata->keymap_data;
if (!keymap_data)
return -EINVAL;
keypad->irq = platform_get_irq(pdev, 0);
if (keypad->irq < 0)
return keypad->irq;
keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(keypad->mmio_base))
return PTR_ERR(keypad->mmio_base);
err = ep93xx_keypad_acquire_gpio(pdev);
if (err)
return err;
err = devm_add_action_or_reset(&pdev->dev,
ep93xx_keypad_release_gpio_action, pdev);
if (err)
return err;
keypad->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(keypad->clk))
return PTR_ERR(keypad->clk);
input_dev = devm_input_allocate_device(&pdev->dev);
if (!input_dev)
return -ENOMEM;
keypad->input_dev = input_dev;
input_dev->name = pdev->name;
input_dev->id.bustype = BUS_HOST;
input_dev->open = ep93xx_keypad_open;
input_dev->close = ep93xx_keypad_close;
err = matrix_keypad_build_keymap(keymap_data, NULL,
EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
keypad->keycodes, input_dev);
if (err)
return err;
if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
__set_bit(EV_REP, input_dev->evbit);
input_set_drvdata(input_dev, keypad);
err = devm_request_irq(&pdev->dev, keypad->irq,
ep93xx_keypad_irq_handler,
0, pdev->name, keypad);
if (err)
return err;
err = input_register_device(input_dev);
if (err)
return err;
platform_set_drvdata(pdev, keypad);
device_init_wakeup(&pdev->dev, 1);
err = dev_pm_set_wake_irq(&pdev->dev, keypad->irq);
if (err)
dev_warn(&pdev->dev, "failed to set up wakeup irq: %d\n", err);
return 0;
}
static int ep93xx_keypad_remove(struct platform_device *pdev)
{
dev_pm_clear_wake_irq(&pdev->dev);
return 0;
}
static struct platform_driver ep93xx_keypad_driver = {
.driver = {
.name = "ep93xx-keypad",
.pm = &ep93xx_keypad_pm_ops,
},
.probe = ep93xx_keypad_probe,
.remove = ep93xx_keypad_remove,
};
module_platform_driver(ep93xx_keypad_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
MODULE_ALIAS("platform:ep93xx-keypad");
Reference in New Issue View Git Blame Copy Permalink