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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Keypad driver for Analog Devices ADP5520 MFD PMICs
*
* Copyright 2009 Analog Devices Inc.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/mfd/adp5520.h>
#include <linux/slab.h>
#include <linux/device.h>
struct adp5520_keys {
struct input_dev *input;
struct notifier_block notifier;
struct device *master;
unsigned short keycode[ADP5520_KEYMAPSIZE];
};
static void adp5520_keys_report_event(struct adp5520_keys *dev,
unsigned short keymask, int value)
{
int i;
for (i = 0; i < ADP5520_MAXKEYS; i++)
if (keymask & (1 << i))
input_report_key(dev->input, dev->keycode[i], value);
input_sync(dev->input);
}
static int adp5520_keys_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct adp5520_keys *dev;
uint8_t reg_val_lo, reg_val_hi;
unsigned short keymask;
dev = container_of(nb, struct adp5520_keys, notifier);
if (event & ADP5520_KP_INT) {
adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo);
adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi);
keymask = (reg_val_hi << 8) | reg_val_lo;
/* Read twice to clear */
adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, ®_val_lo);
adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_val_hi);
keymask |= (reg_val_hi << 8) | reg_val_lo;
adp5520_keys_report_event(dev, keymask, 1);
}
if (event & ADP5520_KR_INT) {
adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo);
adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi);
keymask = (reg_val_hi << 8) | reg_val_lo;
/* Read twice to clear */
adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, ®_val_lo);
adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_val_hi);
keymask |= (reg_val_hi << 8) | reg_val_lo;
adp5520_keys_report_event(dev, keymask, 0);
}
return 0;
}
static int adp5520_keys_probe(struct platform_device *pdev)
{
struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct input_dev *input;
struct adp5520_keys *dev;
int ret, i;
unsigned char en_mask, ctl_mask = 0;
if (pdev->id != ID_ADP5520) {
dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
return -EINVAL;
}
if (!pdata) {
dev_err(&pdev->dev, "missing platform data\n");
return -EINVAL;
}
if (!(pdata->rows_en_mask && pdata->cols_en_mask))
return -EINVAL;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev) {
dev_err(&pdev->dev, "failed to alloc memory\n");
return -ENOMEM;
}
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
dev->master = pdev->dev.parent;
dev->input = input;
input->name = pdev->name;
input->phys = "adp5520-keys/input0";
input->dev.parent = &pdev->dev;
input->id.bustype = BUS_I2C;
input->id.vendor = 0x0001;
input->id.product = 0x5520;
input->id.version = 0x0001;
input->keycodesize = sizeof(dev->keycode[0]);
input->keycodemax = pdata->keymapsize;
input->keycode = dev->keycode;
memcpy(dev->keycode, pdata->keymap,
pdata->keymapsize * input->keycodesize);
/* setup input device */
__set_bit(EV_KEY, input->evbit);
if (pdata->repeat)
__set_bit(EV_REP, input->evbit);
for (i = 0; i < input->keycodemax; i++)
__set_bit(dev->keycode[i], input->keybit);
__clear_bit(KEY_RESERVED, input->keybit);
ret = input_register_device(input);
if (ret) {
dev_err(&pdev->dev, "unable to register input device\n");
return ret;
}
en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
if (en_mask & ADP5520_COL_C3)
ctl_mask |= ADP5520_C3_MODE;
if (en_mask & ADP5520_ROW_R3)
ctl_mask |= ADP5520_R3_MODE;
if (ctl_mask)
ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
ctl_mask);
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
pdata->rows_en_mask);
if (ret) {
dev_err(&pdev->dev, "failed to write\n");
return -EIO;
}
dev->notifier.notifier_call = adp5520_keys_notifier;
ret = adp5520_register_notifier(dev->master, &dev->notifier,
ADP5520_KP_IEN | ADP5520_KR_IEN);
if (ret) {
dev_err(&pdev->dev, "failed to register notifier\n");
return ret;
}
platform_set_drvdata(pdev, dev);
return 0;
}
static int adp5520_keys_remove(struct platform_device *pdev)
{
struct adp5520_keys *dev = platform_get_drvdata(pdev);
adp5520_unregister_notifier(dev->master, &dev->notifier,
ADP5520_KP_IEN | ADP5520_KR_IEN);
return 0;
}
static struct platform_driver adp5520_keys_driver = {
.driver = {
.name = "adp5520-keys",
},
.probe = adp5520_keys_probe,
.remove = adp5520_keys_remove,
};
module_platform_driver(adp5520_keys_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Keys ADP5520 Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-keys");
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