// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2024 NXP.
*/
#include <linux/input.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/scmi_protocol.h>
#include <linux/scmi_imx_protocol.h>
#include <linux/suspend.h>
#define DEBOUNCE_TIME 30
#define REPEAT_INTERVAL 60
struct scmi_imx_bbm {
struct scmi_protocol_handle *ph;
const struct scmi_imx_bbm_proto_ops *ops;
struct notifier_block nb;
int keycode;
int keystate; /* 1:pressed */
bool suspended;
struct delayed_work check_work;
struct input_dev *input;
};
static void scmi_imx_bbm_pwrkey_check_for_events(struct work_struct *work)
{
struct scmi_imx_bbm *bbnsm = container_of(to_delayed_work(work),
struct scmi_imx_bbm, check_work);
struct scmi_protocol_handle *ph = bbnsm->ph;
struct input_dev *input = bbnsm->input;
u32 state = 0;
int ret;
ret = bbnsm->ops->button_get(ph, &state);
if (ret) {
pr_err("%s: %d\n", __func__, ret);
return;
}
pr_debug("%s: state: %d, keystate %d\n", __func__, state, bbnsm->keystate);
/* only report new event if status changed */
if (state ^ bbnsm->keystate) {
bbnsm->keystate = state;
input_event(input, EV_KEY, bbnsm->keycode, state);
input_sync(input);
pm_relax(bbnsm->input->dev.parent);
pr_debug("EV_KEY: %x\n", bbnsm->keycode);
}
/* repeat check if pressed long */
if (state)
schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(REPEAT_INTERVAL));
}
static int scmi_imx_bbm_pwrkey_event(struct scmi_imx_bbm *bbnsm)
{
struct input_dev *input = bbnsm->input;
pm_wakeup_event(input->dev.parent, 0);
/*
* Directly report key event after resume to make no key press
* event is missed.
*/
if (READ_ONCE(bbnsm->suspended)) {
bbnsm->keystate = 1;
input_event(input, EV_KEY, bbnsm->keycode, 1);
input_sync(input);
WRITE_ONCE(bbnsm->suspended, false);
}
schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(DEBOUNCE_TIME));
return 0;
}
static void scmi_imx_bbm_pwrkey_act(void *pdata)
{
struct scmi_imx_bbm *bbnsm = pdata;
cancel_delayed_work_sync(&bbnsm->check_work);
}
static int scmi_imx_bbm_key_notifier(struct notifier_block *nb, unsigned long event, void *data)
{
struct scmi_imx_bbm *bbnsm = container_of(nb, struct scmi_imx_bbm, nb);
struct scmi_imx_bbm_notif_report *r = data;
if (r->is_button) {
pr_debug("BBM Button Power key pressed\n");
scmi_imx_bbm_pwrkey_event(bbnsm);
} else {
/* Should never reach here */
pr_err("Unexpected BBM event: %s\n", __func__);
}
return 0;
}
static int scmi_imx_bbm_pwrkey_init(struct scmi_device *sdev)
{
const struct scmi_handle *handle = sdev->handle;
struct device *dev = &sdev->dev;
struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
struct input_dev *input;
int ret;
if (device_property_read_u32(dev, "linux,code", &bbnsm->keycode)) {
bbnsm->keycode = KEY_POWER;
dev_warn(dev, "key code is not specified, using default KEY_POWER\n");
}
INIT_DELAYED_WORK(&bbnsm->check_work, scmi_imx_bbm_pwrkey_check_for_events);
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "failed to allocate the input device for SCMI IMX BBM\n");
return -ENOMEM;
}
input->name = dev_name(dev);
input->phys = "bbnsm-pwrkey/input0";
input->id.bustype = BUS_HOST;
input_set_capability(input, EV_KEY, bbnsm->keycode);
ret = devm_add_action_or_reset(dev, scmi_imx_bbm_pwrkey_act, bbnsm);
if (ret) {
dev_err(dev, "failed to register remove action\n");
return ret;
}
bbnsm->input = input;
bbnsm->nb.notifier_call = &scmi_imx_bbm_key_notifier;
ret = handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_IMX_BBM,
SCMI_EVENT_IMX_BBM_BUTTON,
NULL, &bbnsm->nb);
if (ret)
dev_err(dev, "Failed to register BBM Button Events %d:", ret);
ret = input_register_device(input);
if (ret) {
dev_err(dev, "failed to register input device\n");
return ret;
}
return 0;
}
static int scmi_imx_bbm_key_probe(struct scmi_device *sdev)
{
const struct scmi_handle *handle = sdev->handle;
struct device *dev = &sdev->dev;
struct scmi_protocol_handle *ph;
struct scmi_imx_bbm *bbnsm;
int ret;
if (!handle)
return -ENODEV;
bbnsm = devm_kzalloc(dev, sizeof(*bbnsm), GFP_KERNEL);
if (!bbnsm)
return -ENOMEM;
bbnsm->ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_BBM, &ph);
if (IS_ERR(bbnsm->ops))
return PTR_ERR(bbnsm->ops);
bbnsm->ph = ph;
device_init_wakeup(dev, true);
dev_set_drvdata(dev, bbnsm);
ret = scmi_imx_bbm_pwrkey_init(sdev);
if (ret)
device_init_wakeup(dev, false);
return ret;
}
static int __maybe_unused scmi_imx_bbm_key_suspend(struct device *dev)
{
struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
WRITE_ONCE(bbnsm->suspended, true);
return 0;
}
static int __maybe_unused scmi_imx_bbm_key_resume(struct device *dev)
{
return 0;
}
static SIMPLE_DEV_PM_OPS(scmi_imx_bbm_pm_key_ops, scmi_imx_bbm_key_suspend,
scmi_imx_bbm_key_resume);
static const struct scmi_device_id scmi_id_table[] = {
{ SCMI_PROTOCOL_IMX_BBM, "imx-bbm-key" },
{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_imx_bbm_key_driver = {
.driver = {
.pm = &scmi_imx_bbm_pm_key_ops,
},
.name = "scmi-imx-bbm-key",
.probe = scmi_imx_bbm_key_probe,
.id_table = scmi_id_table,
};
module_scmi_driver(scmi_imx_bbm_key_driver);
MODULE_AUTHOR("Peng Fan <[email protected]>");
MODULE_DESCRIPTION("IMX SM BBM Key driver");
MODULE_LICENSE("GPL");
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