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/*
* Driver for the IMX SNVS ON/OFF Power Key over sc api
* Copyright (C) 2017 NXP. All Rights Reserved.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <soc/imx8/sc/sci.h>
#include <soc/imx8/sc/svc/irq/api.h>
#define DEBOUNCE_TIME 100
#define REPEAT_INTERVAL 60
struct pwrkey_drv_data {
int keycode;
bool keystate; /* 1: pressed, 0: release */
bool delay_check;
sc_ipc_t ipcHandle;
int wakeup;
struct delayed_work check_work;
struct input_dev *input;
};
static struct pwrkey_drv_data *pdata;
static int imx_sc_pwrkey_notify(struct notifier_block *nb,
unsigned long event, void *group)
{
/* ignore other irqs */
if (!(pdata && pdata->ipcHandle && (event & SC_IRQ_BUTTON) &&
(*(sc_irq_group_t *)group == SC_IRQ_GROUP_WAKE)))
return 0;
if (!pdata->delay_check) {
pdata->delay_check = 1;
schedule_delayed_work(&pdata->check_work,
msecs_to_jiffies(REPEAT_INTERVAL));
}
return 0;
}
static void imx_sc_check_for_events(struct work_struct *work)
{
struct input_dev *input = pdata->input;
bool state;
sc_misc_get_button_status(pdata->ipcHandle, &state);
/*
* restore status back if press interrupt received but pin's status
* released, which caused by pressing so quickly.
*/
if (!state && !pdata->keystate)
state = true;
if (state ^ pdata->keystate) {
pm_wakeup_event(input->dev.parent, 0);
pdata->keystate = !!state;
input_event(input, EV_KEY, pdata->keycode, !!state);
input_sync(input);
if (!state)
pdata->delay_check = 0;
pm_relax(pdata->input->dev.parent);
}
/* repeat check if pressed long */
if (state)
schedule_delayed_work(&pdata->check_work,
msecs_to_jiffies(DEBOUNCE_TIME));
}
static struct notifier_block imx_sc_pwrkey_notifier = {
.notifier_call = imx_sc_pwrkey_notify,
};
static int imx_sc_pwrkey_probe(struct platform_device *pdev)
{
struct input_dev *input = NULL;
struct device_node *np = pdev->dev.of_node;
int error;
uint32_t mu_id;
sc_err_t sciErr;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
pdata->keycode = KEY_POWER;
dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
}
sciErr = sc_ipc_getMuID(&mu_id);
if (sciErr != SC_ERR_NONE) {
dev_err(&pdev->dev, "can not obtain mu id: %d\n", sciErr);
return sciErr;
}
sciErr = sc_ipc_open(&pdata->ipcHandle, mu_id);
if (sciErr != SC_ERR_NONE) {
dev_err(&pdev->dev, "can not get ipc handler: %d\n", sciErr);
return sciErr;
};
INIT_DELAYED_WORK(&pdata->check_work, imx_sc_check_for_events);
pdata->wakeup = of_property_read_bool(np, "wakeup-source");
input = devm_input_allocate_device(&pdev->dev);
if (!input) {
dev_err(&pdev->dev, "failed to allocate the input device\n");
return -ENOMEM;
}
input->name = pdev->name;
input->phys = "imx-sc-pwrkey/input0";
input->id.bustype = BUS_HOST;
input_set_capability(input, EV_KEY, pdata->keycode);
error = input_register_device(input);
if (error < 0) {
dev_err(&pdev->dev, "failed to register input device\n");
return error;
}
pdata->input = input;
platform_set_drvdata(pdev, pdata);
device_init_wakeup(&pdev->dev, !!(pdata->wakeup));
return register_scu_notifier(&imx_sc_pwrkey_notifier);
}
static const struct of_device_id imx_sc_pwrkey_ids[] = {
{ .compatible = "fsl,imx8-pwrkey" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_sc_pwrkey_ids);
static struct platform_driver imx_sc_pwrkey_driver = {
.driver = {
.name = "imx8-pwrkey",
.of_match_table = imx_sc_pwrkey_ids,
},
.probe = imx_sc_pwrkey_probe,
};
module_platform_driver(imx_sc_pwrkey_driver);
MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
MODULE_DESCRIPTION("i.MX8 power key driver based on scu");
MODULE_LICENSE("GPL");
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